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  • Articles  (36,454)
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  • Articles  (36,454)
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  • 1
    Electronic Resource
    Electronic Resource
    Some characteristics of the AEOI passive radon diffusion dosimeter
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part D, 15 (1988), S. 605-608 
    Details
    ISSN: 1359-0189
    Keywords: Radon ; calibration ; design ; diffusion dosimeter ; electrochemical etching ; lower det. limit ; optimization ; passive ; polycarbonate ; pre-etching ; sensitivity
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1359-0189(88)90210-5
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  • 2
    Electronic Resource
    Electronic Resource
    Design characteristics of a three-component AEOI Neutriran Albedo Neutron Personnel Dosimeter
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part D, 19 (1991), S. 537-540 
    Details
    ISSN: 1359-0189
    Keywords: Dosimeter ; ECE ; Neutriran ; ^1^0B ; albedo ; alpha and recoil tracks ; calibration ; characteristics ; design ; optimization ; personnel ; three components
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1359-0189(91)90263-H
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  • 3
    Electronic Resource
    Electronic Resource
    An algorithm for the simulation of density-programmed supercritical fluid chromatography
    Amsterdam : Elsevier
    The @Journal of Supercritical Fluids 3 (1990), S. 127-135 
    Details
    ISSN: 0896-8446
    Keywords: density programming simulation ; optimization ; supercritical fluid chromatography
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0896-8446(90)90037-M
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  • 4
    Electronic Resource
    Electronic Resource
    Dissolved oxygen concentration in an undivided rotating cylinder electrode reactor
    Amsterdam : Elsevier
    Electrochimica Acta 39 (1994), S. 2705-2713 
    Details
    ISSN: 0013-4686
    Keywords: dissolved oxygen concentration ; optimization ; rotating cylinder electrode reactor ; steady state mass balance. ; undivided reactor
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(94)00293-2
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  • 5
    Electronic Resource
    Electronic Resource
    Ion Trajectory Analysis Program (ITAP)
    Amsterdam : Elsevier
    Computer Physics Communications 64 (1991), S. 167-182 
    Details
    ISSN: 0010-4655
    Keywords: accelerators ; dispersion ; divergence ; electron ; first-order ; ion ; ion-optics ; matrix ; optimization ; paraxial ; prism ; size ; trajectories ; transport
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0010-4655(91)90059-T
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  • 6
    Electronic Resource
    Electronic Resource
    Planar heliocentric roto-translatory motion of a spacecraft with a solar sail of complex shape (1995)
    Springer
    Celestial mechanics and dynamical astronomy 63 (1995), S. 255-269 
    Details
    ISSN: 1572-9478
    Keywords: Solar sail ; orbit-rotation coupling ; passive radiative orientation ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A complete treatment of the general motion of rotation and translation of a solar-sail spacecraft is proposed for the non-flat sail of complex shape. The planar heliocentric roto-translatory motion is considered, orbit-rotational coupling in the problem of altitude and orbital sail motion is investigated for the two-folding sail formed by two unequal reflective rectangular plates oriented at a right angle. The problem of orbit-rotational coupling is essentially a planar one: both sail plates are orthogonal to the orbital plane. The possibility of the non-controlled interplanetary transfer with such two-folding sail at its passive radiational orientation is established analytically from point of view of orbit-rotational coupling. Optimal geometric proportions of this sail are found at minimum-time interplanetary transfers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692290
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  • 7
    Electronic Resource
    Electronic Resource
    Optimal synthesis of three-revolute manipulators (1994)
    Springer
    Meccanica 29 (1994), S. 95-103 
    Details
    ISSN: 1572-9648
    Keywords: Synthesis ; optimization ; kinematics ; robotics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario In questo lavoro si propone e viene discusso un metodo di ottimizzazione applicato alla sintesi di manipolatori, aventi una catena cinematica aperta con tre coppie rotoidali, la cui struttura soddisfi ai requisiti di ingombro minimo e spazio di lavoro assegnato tramite limitazioni prefissate. Per la risoluzione del problema à stata utilizzata una tecnica di programmazione quadratica sequenziale, la cui efficacia è dimostrata tramite esempi.
    Notes: Abstract An optimization method is proposed and discussed in order to synthesize a three-revolute open chain manipulator whose structure can have minimum size encumbrance and a workspace with prescribed constraints. The sequential quadratic programming optimization technique used has been successfully applied to the formulated problem as illustrated in some examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989527
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  • 8
    Electronic Resource
    Electronic Resource
    Evolution by damage spreading in Kauffman model (1994)
    Springer
    Journal of statistical physics 74 (1994), S. 1293-1299 
    Details
    ISSN: 1572-9613
    Keywords: Cellular automata ; critical phenomena ; optimization ; spin glass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In Kauffman's Boolean automata model on the square lattice, the Darwinian fitness of survival can be defined as the fraction of elements which do not change from one iteration to the next. Biological mutations are simulated by filpping one bit in the rule of one site. Selection of the fitter mutant then optimizes the whole lattice completely. This optimization is particularly effective near the critical point of the transition to chaos, but is in itself not a critical phenomenon. Also a two-dimensional spin glass can be optimized in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02188232
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical physics of fault patterns self-organized by repeated earthquakes (1994)
    Springer
    Pure and applied geophysics 142 (1994), S. 491-527 
    Details
    ISSN: 1420-9136
    Keywords: Self-organization ; self-organized criticality ; random directed polymer ; fractals ; multi-fractals ; faults ; earthquakes ; competition ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This work presents at attempt to model brittle ruptures and slips in a continental plate and its spontaneous organization by repeated earthquakes in terms of coarse-grained properties of the mechanical plate. A statistical physics model, which simulates anti-plane shear deformation of a thin plate with inhomogeneous elastic properties, is thus analyzed theoretically and numerically in order to study the spatio-temporal evolution of rupture patterns in response to a constant applied strain rate at its borders, mimicking the effect of neighboring plates. Rupture occurs when the local stress reaches a threshold value. Broken elements are instantaneously healed and retain the original material properties, enabling the occurrence of recurrent earthquakes. Extending previous works (Cowie et al., 1993;Miltenberger et al., 1993), we present a study of the most startling feature of this model which is that ruptures become strongly correlated in space and time leading to the spontaneous development of multifractal structures and gradually accumulate large displacements. The formation of the structures and the temporal variation of rupture activity is due to a complex interplay between the random structure, long-range elastic interactions and the threshold nature of rupture physics. The spontaneous formation of fractal fault structures by repeated earthquakes is mirrored at short times by the spatio-temporal chaotic dynamics of earthquakes, well-described by a Gutenberg-Richter power law. We also show that the fault structures can be understood as pure geometrical objects, namely minimal manifolds, which in two dimensions correspond to the random directed polymer (RDP) problem. This mapping allows us to use the results of many studies on the RDP in the field of statistical physics, where it is an exact result that the minimal random manifolds in 2D systems are self-affine with a roughness exponent 2/3. We also present results pertaining to the influence of the degree β of stress release per earthquake on the competition between faults. Our results provide a rigorous framework from which to initiate rationalization of many, reported fractal fault studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876052
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  • 10
    Electronic Resource
    Electronic Resource
    Lens Design: Global Optimization with Escape Function (1995)
    Springer
    Optical review 2 (1995), S. 463-470 
    Details
    ISSN: 1349-9432
    Keywords: lens design ; optimization ; global optimization ; damped least squares method ; damping factor ; aberration ; merit function ; escape function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The technique of using the ‘escape function’ for global optimization in lens design is described. This includes how to identify two solutions as independent; the threshold value for this criterion can be chosen to determine how to explore local solutions—rough or fine. Choice of appropriate values for two parameters in the escape function is most important, since this will affect the efficiency of the automatic global optimization process. There are two problems, i.e. giving default values at the beginning of the design, and determining a default rule to change them when the escape is unsuccessful. The latter was solved by assuming a ‘saddle path’ as the best route to escape. An exact solution for the former was not found, but a hint for finding a second best solution is shown based on the statistical study of local minima.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-995-0463-6
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  • 11
    Electronic Resource
    Electronic Resource
    Lens Design: An Attempt to Use ‘Escape Function’ as a Tool in Global Optimization (1995)
    Springer
    Optical review 2 (1995), S. 47-51 
    Details
    ISSN: 1349-9432
    Keywords: lens design ; optimization ; global optimization ; damped least squares method ; damping factor ; aberration ; merit function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In designing lenses with the damped least squares method, the solution obtained by optimization routine is a local minimum of the merit function. To get out of this and seek a different solution, we propose to use an ‘escape function’ as an additional operand of the lens system, to be controlled. Experiments were made on simple models of merit function and the advantage of this technique was ascertained. We also planted this algorithm into OSLO SIX (lens design software by Sinclair Optics) by means of CCL (C-compatible language) and applied it to actual lens design. Experiments convinced us that the method would be an effective tool for global optimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-995-0047-5
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  • 12
    Electronic Resource
    Electronic Resource
    Multiobjective fuzzy optimum design of antenna structures (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 81-91 
    Details
    ISSN: 0894-9166
    Keywords: fuzzy ; optimization ; application ; multiobjective ; antenna ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract On the basis of the recently proposed general fuzzy optimization [1–2], this paper investigates the multiobjective fuzzy optimum design of antenna structures, in which the weight objective, precision objective, lowest frequency objective and safety degree objective are included. This is a successful application of fuzzy optimization to large engineering structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205626
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  • 13
    Electronic Resource
    Electronic Resource
    An efficient genetic algorithm for large scale built-up structural optimization (1994)
    Springer
    Acta mechanica solida Sinica 7 (1994), S. 29-38 
    Details
    ISSN: 0894-9166
    Keywords: optimization ; zigzag method ; GAs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper, a new zigzag method for plate structures and a genetic algorithm (GA) of dynamic source seed spaces are developed and a combination of them is used to deal with large scale built-up structural optimization. The new GA combined with the zigzag method can work efficiently when coping with large scale structural optimization included displacement and stress constraints. Examples show that this GA is robust and can be used for many complex structural optimization problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207302
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  • 14
    Electronic Resource
    Electronic Resource
    The solar wind and human birth rate: A possible relationship due to magnetic disturbances (1990)
    Springer
    International journal of biometeorology 34 (1990), S. 42-48 
    Details
    ISSN: 1432-1254
    Keywords: Briths ; Humans ; Solar wind ; Geomagnetism ; Melatonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Data obtained from the literature on the annual pattern of human conceptions and plasma melatonin at high latitudes indicated that simple annual rhythms do not exist. Instead, prominent semiannual rhythms are found, with equinoctial troughs and solsticial peaks. A prominent semiannual environmental event is the magnetic disturbance induced by the solar wind. The semiannual magnetic disturbances are worldwide, but most pronounced in the auroral zones where the corpuscular radiation enters the atmosphere. Magnetic indices that predominantly reflect these events were obtained from the literature and correlated with the melatonin and conception data. Significant and inverse correlations were found for Inuit conceptions and the melatonin data. The correlations obtained for 48 contiguous states of the United States indicated that only the extreme northern states exhibited this relationship. These data were compared with a previous correlational study in the United States which established that sunshine was correlated with conceptions in the middle latitude and southern states. An hypothesis of dual control by electromagnetic and magnetic energies is proposed: melatonin is a progonadal hormone in humans controlled by both factors, depending on their relative strength. Other studies are reviewed regarding the possible factors involved in determining the annual pattern of human conceptions. Demographic studies of geographic variation in temporal patterns of conceptions, with particular regard to variations of the magnetic fields on the earth's surface, may provide some insight into the efficacy of these different factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045819
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  • 15
    Electronic Resource
    Electronic Resource
    The tRNA cycle and its relation to the rate of protein synthesis (1985)
    Springer
    European biophysics journal 12 (1985), S. 115-119 
    Details
    ISSN: 1432-1017
    Keywords: tRNA cycle ; optimization ; elongation rate ; codon frequency ; tRNA synthetase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract With the aid of a kinetic model, we have investigated how the adaptation between the various components of the tRNA cycle and the codon frequencies affects the rate of protein synthesis. Depending on the relative amounts of total tRNA, synthetase and ribosomes, the optimal correlations vary between a situation where all tRNA species are either present in equal amounts or are present in amounts proportional to the square-root of the corresponding codon frequencies, and a situation where the amounts of the different tRNA species present are linearly proportional to the codon frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260434
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  • 16
    Electronic Resource
    Electronic Resource
    Computing a closest bifurcation instability in multidimensional parameter space (1993)
    Springer
    Journal of nonlinear science 3 (1993), S. 307-327 
    Details
    ISSN: 1432-1467
    Keywords: bifurcation ; saddle node ; Hopf ; stability ; robustness ; optimization ; numerical methods ; transcritical ; pitchfork ; extended systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary Engineering and physical systems are often modeled as nonlinear differential equations with a vector λ of parameters and operated at a stable equilibrium. However, as the parameters λ vary from some nominal value λ0, the stability of the equilibrium can be lost in a saddle-node or Hopf bifurcation. The spatial relation in parameter space of λ0 to the critical set of parameters at which the stable equilibrium bifurcates determines the robustness of the system stability to parameter variations and is important in applications. We propose computing a parameter vector λ* at which the stable equilibrium bifurcates which is locally closest in parameter space to the nominal parameters λ0. Iterative and direct methods for computing these locally closest bifurcations are described. The methods are extensions of standard, one-parameter methods of computing bifurcations and are based on formulas for the normal vector to hypersurfaces of the bifurcation set. Conditions on the hypersurface curvature are given to ensure the local convergence of the iterative method and the regularity of solutions of the direct method. Formulas are derived for the curvature of the saddle node bifurcation set. The methods are extended to transcritical and pitchfork bifurcations and parametrized maps, and the sensitivity to λ0 of the distance to a closest bifurcation is derived. The application of the methods is illustrated by computing the proximity to the closest voltage collapse instability of a simple electric power system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429868
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  • 17
    Electronic Resource
    Electronic Resource
    The optimal truncated low-dimensional dynamical systems based on flow databases (1996)
    Springer
    Acta mechanica Sinica 12 (1996), S. 104-116 
    Details
    ISSN: 1614-3116
    Keywords: partial differential equation ; flow database ; optimization ; dynamical system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new theory on the construction of optimal truncated Low-Dimensional Dynamical Systems (LDDSs) with different physical meanings has been developed. The physical properties of the optimal bases are reflected in the user-defined optimal conditions. Through the analysis of linear and nonlinear examples, it is shown that the LDDSs constructed by using the Proper Orthogonal Decomposition (POD) method are not the optimum. After comparing the errors of LDDSs based on the new theory, POD and Fourier methods, it is concluded that the LDDSs based on the new theory are optimally truncated and catch the desired physical properties of the systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02486789
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  • 18
    Electronic Resource
    Electronic Resource
    A new approach to inverse problems of wave equations (1990)
    Springer
    Applied mathematics and mechanics 11 (1990), S. 1113-1117 
    Details
    ISSN: 1573-2754
    Keywords: inverse problem ; wave equation ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract We introduce a multi-cost-functional method for solving inverse problems of wave equations. This method has its simplicity, efficiency and good physical interpretation. It has the advantage of being programmed for two- or three- (space) dimensional problems as well as for one-dimensional problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02016614
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  • 19
    Electronic Resource
    Electronic Resource
    Genetic Algorithms for Optimizing the Remediation of Contaminated Aquifer (2000)
    Springer
    Transport in porous media 41 (2000), S. 149-171 
    Details
    ISSN: 1573-1634
    Keywords: hydrodynamic isolation ; plume ; remediation ; genetic algorithms ; optimization ; aquifer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract Produced water constitutes a large amount of waste fluids during the production operation of an oil field. Underground injection for disposing the wastewater from hydrocarbon production is an engineering problem due to the possibility of leakage of injected pollutant material from receiving medium to a drinking water source. This paper describes a method for optimization of polluted aquifer remediation design using one of the artificial intelligence optimization methods, namely Genetic Algorithms (GAs). As a case study, the contaminated area was created by using a groundwater transport simulator, which is based on Method of Characteristics (MOC). Then, the developed computer program was run to find the optimum solution for remediation, and the solution yielded from the program was verified by using a groundwater simulator. The plume was captured and the concentration level of chloride ion within the aquifer was diminished by using extraction wells. The analytical model approach provided different alternatives for appropriate isolation of plume. GAs were used as an optimization technique for making a decision among the alternatives, by considering operation time, number of wells, pumping rate and drawdown as decision variables and constraints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006774101991
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  • 20
    Electronic Resource
    Electronic Resource
    Optimization by simulated annealing: Quantitative studies (1984)
    Springer
    Journal of statistical physics 34 (1984), S. 975-986 
    Details
    ISSN: 1572-9613
    Keywords: Spin glasses ; optimization ; graph partitioning ; algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Simulated annealing is a stochastic optimization procedure which is widely applicable and has been found effective in several problems arising in computeraided circuit design. This paper derives the method in the context of traditional optimization heuristics and presents experimental studies of its computational efficiency when applied to graph partitioning and traveling salesman problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009452
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  • 21
    Electronic Resource
    Electronic Resource
    Numerical Study of Processes in the Cavity of the 170 GHz Gyrotron for ITER Operating at the TE25.10 Mode (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 1381-1395 
    Details
    ISSN: 1572-9559
    Keywords: gyrotrons ; optimization ; mode competition ; start-up ; recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The opportunity of use of a TE25.10 operating mode for CW 170 GHz/1 MW gyrotron for ITER is estimated. Parameters are optimized to achieve maximum efficiency of the gyrotron with an acceptable Ohmic load on the cavity. The influence of unwanted mode conversion at the output of the resonator, mode competition, electron beam potential depression, ion compensation of the space charge and beam energy recovery is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026448822363
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  • 22
    Electronic Resource
    Electronic Resource
    Simultaneous Optimization as a Method to Establish Generalized Functional Forms for Empirical Equations of State (1998)
    Springer
    International journal of thermophysics 19 (1998), S. 491-500 
    Details
    ISSN: 1572-9567
    Keywords: equations of state ; optimization ; nonpolar fluids ; methane ; argon ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new algorithm for the optimization of functional forms of empirical equations of state is presented which considers data sets of different substances simultaneously. In this way, functional forms for empirical equations of state can be developed which yield, on average, the best representation of the thermo-dynamic properties of all substances within larger groups of substances (e.g., “nonpolar” and “polar” substances). The new algorithm is being used to develop a new class of empirical equations of state which meet typical technical requirements on the accuracy of thermodynamic properties with only about 10 fittable coefficients. The first results for nonpolar fluids are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022573729698
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  • 23
    Electronic Resource
    Electronic Resource
    Optimization of the take-off movement of ski jumping with the method of mathematical programming (1992)
    Springer
    Applied mathematics and mechanics 13 (1992), S. 669-674 
    Details
    ISSN: 1573-2754
    Keywords: mathematical programming ; optimization ; dynamics of systems of rigid bodies ; ski jumping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract This paper is based on the finite and dispersed data which were obtained from the experiments of the wind tunnel and of the force measurement and from the high-speed photography. It analyses and optimizes the take-off movement of ski jumping with the theory of dynamics of systems of rigid bodies and with the method of mathematical programming. The paper describes the optimal take-off movement of ski jumping. Furthermore, it presents an example and compares the result with those of other papers published at home and abroad. The comparison shows that our computation and optimization are reasonable and well-grounded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456091
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  • 24
    Electronic Resource
    Electronic Resource
    The limiting stokes wave with finite water depth (1993)
    Springer
    Applied mathematics and mechanics 14 (1993), S. 887-889 
    Details
    ISSN: 1573-2754
    Keywords: Stokes wave ; limiting wave ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract In this paper we extend the method developed in [1] for limiting Stokes wave of infinite water depth to cover the case of finite depth. The method has high efficiency and the result is accurate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457484
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  • 25
    Electronic Resource
    Electronic Resource
    Topology optimization design of continuum structures under stress and displacement constraints (2000)
    Springer
    Applied mathematics and mechanics 21 (2000), S. 19-26 
    Details
    ISSN: 1573-2754
    Keywords: structure ; optimization ; topology optimization ; modeling ; dual programming ; O223 ; TU323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract Topology optimization design of continuum structures that can take account of stress and displacement constraints simultaneously is difficult to solve at present. The main obstacle lies in that, the explicit function expressions between topological variables and stress or displacement constraints can not be obtained using homogenization method or variable density method. Furthermore, large quantities of design variables in the problem make it hard to deal with by the formal mathematical programming approach. In this paper, a smooth model of topology optimization for continuum structures is established which has weight objective considering stress and displacement constraints based on the independent-continuous topological variable concept and mapping transformation method proposed by Sui Yunkang and Yang Deqing. Moreover, the approximate, explicit expressions are given between topological variables and stress or displacement constraints. The problem is well solved by using dual programming approach, and the proposed element deletion criterion implements the inversion of topology variables from the discrete to the continuous. Numerical examples verify the validity of proposed method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458535
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    Influence of the viscoelastic properties of the respiratory system on the energetically optimum breathing frequency (1993)
    Springer
    Annals of biomedical engineering 21 (1993), S. 489-499 
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    ISSN: 1573-9686
    Keywords: Work of breathing ; Inspiratory pressure-time integral ; Respiratory modeling ; Dogs ; Humans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract We hypothesized that the viscoelastic properties of the respiratory system should have significant implications for the energetically optimal frequency of breathing, in view of the fact that these properties cause marked dependencies of overall system resistance and elastance on frequency. To test our hypothesis we simulated two models of canine and human respiratory system mechanics during sinusoidal breathing and calculated the inspiratory work ( $$\dot W$$ ) and pressure-time integral (PTI) per minute under both resting and exercise conditions. The two models were a two-compartment viscoelastic model and a single-compartment model. Requiring minute alveolar ventilation to be fixed, we found that both models predicted almost identical optimum breathing frequencies. The calculated PTI was very insensitive to increases in breathing frequency above the optimal frequencies, while $$\dot W$$ was found to increase slowly with frequency above its optimum. In contrast, both $$\dot W$$ and PTI increased sharply as frequency decreased below their respective optima. A sensitivity analysis showed that the model predictions were very insensitive to the elastance and resistance values chosen to characterize tissue viscoelasticity. We conclude that the $$\dot W$$ criterion for choosing the frequency of breathing is compatible with observations in nature, whereas the optimal frequency predictions of the PTI are rather too high. Both criteria allow for a fairly wide margin of choice in frequency above the optimum values without incurring excessive additional energy expenditure. Furthermore, contrary to our expectations, the viscoelastic properties of the respiratory system tissues do not pose a noticeable problem to the respiratory controller in terms of energy expenditure.
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    Optimally Designed Shell Enclosures with Tuned Absorbers for Minimizing Sound Power (2000)
    Springer
    Optimization and engineering 1 (2000), S. 67-86 
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    ISSN: 1573-2924
    Keywords: vibration absorbers ; optimization ; noise reduction ; sound power
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract This paper presents a design methodology for reducing radiated noise from enclosures using multiple optimized tuned absorbers. The methodology starts from the sound power spectrum of the enclosed noise source and ends with optimally sized/located absorbers on a surrounding thin shell enclosure. The design approach combines a finite element method vibration prediction code, a boundary element method sound power prediction code and a combined stochastic/gradient-based optimization algorithm. A design example has been optimized for a thin shell covering a motor/gearbox. The addition of a small amount of weight (130 g or 1.6% of the weight of the shell) produced substantial reductions in radiated sound power (13 dB in the targeted 1/3 octave band centered at 125 Hz). The design has been validated by experiment.
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    URL: http://dx.doi.org/10.1023/A:1010046506443
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    On Debonding and Delamination Effects in Adhesively Bonded Cracks on Fractal Type (1998)
    Springer
    Journal of elasticity 51 (1998), S. 177-201 
    Details
    ISSN: 1573-2681
    Keywords: fractal geometry ; fractal interpelation functions ; debonding ; delamination ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The present paper studies the influence of adhesives on the behaviour of cracks in deformable bodies. Especially the delamination and debonding effects are studied. The adhesive material is assumed to introduce nonmonotone possibly multivalued laws which can be described via nonconvex superpotentials. Cracks of fractal geometry are considered. Approximating the fractal crack by a sequence of smooth surfaces or curves and combining this procedure with an algorithm based on the optimization of the potential and of the complementary energy for each approximation of the fractal crack, we get the solution of the problem. Numerical examples, using singular elements for the consideration of the crack singularity, illustrate the theory.
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    URL: http://dx.doi.org/10.1023/A:1007525112667
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    Optimal Fiber-Mesh Layout for a Composite Anisotropic Elastic Wedge (2000)
    Springer
    Journal of elasticity 60 (2000), S. 103-117 
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    ISSN: 1573-2681
    Keywords: optimization ; anisotropic elasticity ; fiber-mesh layout ; elastic wedge ; Lekhnitskii formalism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We consider a homogeneous orthotropic elastic wedge in plane stress loaded by a concentrated force at the apex. The orthotropic material is conceived of to be formed by a matrix reinforced by a triangular net of elastic fibers, so that the fiber size and the net shape determine the average elastic moduli of the composite material. It is found that maintaining fixed the amount of material used for the reinforcement, there exists a particular fiber disposal which maximizes the stiffness of the wedge. The optimal disposal is different-in-type for diverse opening-angles of the wedge.
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    Material symmetry optimization by Kelvin modes (2000)
    Springer
    Journal of engineering mathematics 37 (2000), S. 27-43 
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    ISSN: 1573-2703
    Keywords: anisotropic elasticity ; Kelvin modes ; optimization ; strain energy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract Pointwise optimization of the material symmetry of an anisotropic elastic material with respect to fixed and specified stress (or strain) states is accomplished. The conceptual variables in this problem are the type of material symmetry and the orientation of the canonical symmetry axis for the material at a point in the material. The actual variables are the coefficients of the elasticity (or compliance) matrix. The results are presented in the form of the elasticity (or compliance) matrices that minimize the strain energy with respect to specified, but arbitrary, stress (or strain) states.
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    URL: http://dx.doi.org/10.1023/A:1004749203449
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    A Fourier analysis and dynamic optimization of the Petrov-Galerkin finite element method (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 4123-4155 
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    ISSN: 0029-5981
    Keywords: Petrov-Galerkin methods ; weighting parameters ; optimization ; spectral averaged phase errors ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A Fourier analysis of the linear and quadratic N + 1 and N + 2 Petrov-Galerkin finite element methods applied to the one-dimensional transient convective-diffusion equation is performed. The results show that a priori optimization of the N + 1 method is not possible because dissipative errors are introduced as dispersive errors are reduced (any optimization is subjective). However, a priori optimization of the N + 2 Petrov-Galerkin method is possible because the reduction of dispersion errors can be accomplished without the addition of artificial dissipation.The Spectrally Weighted Average Phase Error Method (SWAPEM) for the optimization of the N + 2 Petrov-Galerkin method is introduced, in which the N + 2 weighting parameter is chosen at each time step to minimize the integral over wave number of the phase error of Fourier modes, weighted by the frequency content of the global solution at the previous time step (obtained via FFT). The method is dynamic, and general in that the dependence of the weighting parameter on the solution waveform is accounted for. Optimal values predicted by the method are in excellent agreement with those suggested by the numerical experimentation of others. Simulations of the pure convective transport of a Gaussian plume and a triangle wave are discussed to illustrate the effectiveness of the method.
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    Sequential function approximation for the solution of differential equations (1997)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 13 (1997), S. 977-986 
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    ISSN: 1069-8299
    Keywords: sequential function approximation ; interpolation functions ; optimization ; parallel direct search ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A computational method for the solution of differential equations is proposed. With this method an accurate approximation is built by incremental additions of optimal local basis functions. The parallel direct search software package (PDS), that supports parallel objective function evaluations, is used to solve the associated optimization problem efficiently. The advantage of the method is that, although it resembles adaptive methods in computational mechanics, an a priori grid is not necessary. Moreover, the traditional matrix construction and evaluations are avoided. Computational cost is reduced while efficiency is enhanced by the low-dimensional parallel-executed optimization and parallel function evaluations. In addition, the method should be applicable to a broad class of interpolation functions. Results and global convergence rates obtained for one- and two-dimensional boundary value problems are satisfactorily compared to those obtained by the conventional Galerkin finite element method. © 1997 John Wiley & Sons, Ltd.
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    Design sensitivity and constraint approximation methods for optimization in non-linear analysis (1997)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 13 (1997), S. 999-1008 
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    ISSN: 1069-8299
    Keywords: optimization ; sensitivity analysis ; constraint approximation ; non-linear analysis ; finite element method ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: For the finite element non-linear analysis of engineering problems combined with an optimization method, two techniques - a semi-analytical sensitivity method and bi-point constraint approximation - have been proposed. To validate the proposed methods, a raft foundation on a soil medium has been analysed and the results have been compared. From the numerical results, it has been found that, for non-linear analysis, the semi-analytical sensitivity method is more efficient than the finite difference method and the bi-point approximation gives results which compare favourably with the finite element results. © 1997 John Wiley & Sons, Ltd.
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    AN EIGEN-FORCE METHOD FOR FINITE ELEMENT ANALYSIS AND REANALYSIS (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 777-796 
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    ISSN: 0029-5981
    Keywords: finite element method ; force method ; reanalysis ; eigenvalue ; structural variation ; optimization ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents a force-based finite element method that involves eigen-space transformation of element stiffness matrices in the first analysis. In each subsequent analysis (‘reanalysis’) associated with structural variations, the solution obtained previously is modified making use of intrinsic properties of eigen solutions and avoiding the time-consuming task of solving a large system of equations. The structural variations may involve changes in material properties, birth or death of elements, or change in boundary conditions. Numerical examples are presented to compare the accuracy and computational efficiency of the proposed method with the displacement-based finite element method. © 1997 by John Wiley & Sons, Ltd.
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    A mixed evolutionary/heuristic approach to shape optimization (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 41 (1998), S. 1463-1484 
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    ISSN: 0029-5981
    Keywords: optimization ; shape design ; heuristics ; evolutionary optimization ; splines ; finite elements ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The problem of finding the optimal shape of a continuous structure is addressed using, alternatively, heuristic, evolutionary and mixed evolutionary and heuristic optimization strategies. Boundaries are represented by B-splines. Two heuristics for minimizing the weight of a structure subject to limits on von Mises stresses and geometrical constraints are implemented: ‘generalized biological growth’ and ‘penalized biological growth’. Penalized biological growth adds to generalized biological growth a control for shape changes. This control is based on the overall state of constraints satisfaction in the structure. The two heuristics are very efficient at improving the designs, but they do not yield globally optimal shapes. Therefore, they are interfaced with an evolutionary optimizer. Different strategies for mixing evolutionary search and biological growth are compared. Results are obtained for fan disk shape problems. They show that mixing evolutionary search with biological growth improves the efficiency of the optimization. The method offers to the designer new paths for a better component determination. © 1998 John Wiley & Sons, Ltd.
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    The MINLP optimization approach to structural synthesis. Part II: Simultaneous topology, parameter and standard dimension optimization by the use of the linked two-phase MINLP strategy (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 293-328 
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    ISSN: 0029-5981
    Keywords: structural synthesis ; optimization ; topology optimization ; discrete variable optimization ; Mixed-Integer Non-linear Programming ; MINLP ; the Modified OA/ER algorithm ; MINLP strategy ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Part II describes the Mixed-Integer Non-linear Programming (MINLP) approach to structural synthesis where standard dimensions are added to simultaneous topology and parameter optimization. For this purpose, the mechanical superstructure has been enhanced and a special MINLP-MS model formulation for mechanical superstructures from Part I adapted to standard dimension alternatives, which give rise to complex MINLP problems that are difficult to solve. A Linked Two-Phase MINLP Strategy has been developed to efficiently accelerate the solutions of highly combinatorial MINLP problems, performed by the Modified OA/ER algorithm. In the first phase, the strategy uses only continuous dimensions making it easier to find an optimal topology. Based on the obtained global linear approximation of the superstructure, the proposed strategy in the second phase continues to perform an overall simultaneous optimization, where standard dimensions are added as additional discrete optimization alternatives. Thus, simultaneous topology, parameter and standard dimension optimization is now performed in the second phase. The synthesis of a multiple cantilever beam, introduced in Part I, was performed in accordance with the steps proposed by the MINLP optimization approach. This approach enables the obtaining of additional savings when compared to the one in Part I. © 1998 John Wiley & Sons, Ltd.
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    CRASHWORTHINESS ANALYSIS AND DESIGN USING RIGID-FLEXIBLE MULTIBODY DYNAMICS WITH APPLICATION TO TRAIN VEHICLES (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 655-687 
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    ISSN: 0029-5981
    Keywords: crashworthiness ; multibody dynamics ; flexible structures ; simulation ; design ; optimization ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Different formulations based on multibody dynamics are shown to be suitable for the development of a methodology for the impact simulation and crashworthiness design of railway vehicles. The proposed design methodology comprises different computer-aided tools of increasing complexity and accuracy which can be used with greater advantage and efficiency in the different design stages of railway stock. In general, the crashworthiness design methods and associated multibody dynamic tools which are presented in this paper require information to be obtained from numerical or experimental crush tests of specific structural components, subassemblies and critical energy absorption devices normally located in car extremities. This hybrid feature lends to the present design process various efficiency gains as a result of a better understanding of the crash and different collapse mechanisms and ease of use. To access the merits of the present methodologies some new designs are discussed and the application of the proposed numerical tools is illustrated for different structural configurations of car extremities. A formulation for the sensitivity analysis and optimization of planar constrained mechanical systems is also presented. An example of crashworthiness design of an end underframe model of a railway car is solved to demonstrate the use of the methodology. © 1997 by John Wiley & Sons, Ltd.
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    Optimization method for steady conduction in special geometry using a boundary element method (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 1109-1126 
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    ISSN: 0029-5981
    Keywords: three-dimensional conduction heat transfer ; special boundary integral formulation ; Design Sensitivity Analysis (DSA) ; Direct Differentiation Approach (DDA) ; optimization ; CONMIN algorithm ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In some steady heat conduction problems in special geometries which consist of a closely spaced surface and circular holes in an infinite domain, thermal system designers may want to optimize the configuration of circular holes in terms of their radii and locations to achieve the goal of uniform temperature distribution over a closely spaced surface. In this paper, an efficient optimization procedure for this kind of problem is proposed utilizing (i) the special boundary element analysis, (ii) the corresponding design sensitivity analysis and (iii) the CONMIN algorithm. Three sample problems were solved to demonstrate the efficiency and the usefulness of the proposed optimization procedure. Some industrial engineering examples of such problems can be found in the injection molding process, the compression molding process, and so on. © 1998 John Wiley & Sons, Ltd.
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    Non-parametric-validated computer-simulation surrogates: a Pareto formulation (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 42 (1998), S. 971-1003 
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    ISSN: 0029-5981
    Keywords: computer-simulation surrogates ; optimization ; Pareto optimality ; non-parametric statistical validation ; predictability ; quasi-convex analysis ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In the surrogate approach to simulation-based optimization, the large-scale simulation is evoked only to construct and validate a simplified input-output model; this simplified input-output model then serves as a simulation surrogate in subsequent engineering optimization studies. We present here ‘basic’ and Pareto surrogate formulations through an illustrative application from fluid dynamics.The critical ingredient of both formulations is a non-parametric statistical validation and error estimation procedure which, based on verifiable hypotheses, precisely quantifies the effect of surrogate-for-simulation substitution on system predictability, stability, and optimality. The Pareto formulation improves upon the basic approach by operating only in the vicinity of the efficient frontier of the output achievable set A for problems with many inputs and few outputs, this considerably reduces the dimensionality of the problem, and correspondingly improves the surrogate error estimates. © 1998 John Wiley & Sons, Ltd.
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    Thermal optimization in transient thermoelasticity using response surface approximations (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 1-21 
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    ISSN: 0029-5981
    Keywords: response surface approximations ; transient thermoelastic analysis ; optimization ; thermal design ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Response surface methodology is used to construct approximations to temperature and stress in transient thermoelastic analysis of non-linear systems. The analysis forms the core component of a heating/cooling rate maximization problem in which the ordinates of the ambient temperature at equally spaced time intervals are chosen as the design variables. Polynomials or cubic splines are fitted through the ordinates to describe the ambient temperature profile required for the convective heat transfer analysis. An experimental design method based on D-optimality and a genetic algorithm was used to select the design points used to create the approximations. Linear response surfaces were found to be sufficiently accurate, thereby minimizing the number of finite element analyses. Two examples of which one is a thick-walled pressure vessel are used to illustrate the methodology. © 1998 John Wiley & Sons, Ltd.
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    Optimized partitioning of unstructured finite element meshes (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 433-450 
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    ISSN: 0029-5981
    Keywords: mesh partitioning ; finite elements ; parallel computing ; optimization ; heuristics ; frontal method ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: We address the problem of automatic partitioning of unstructured finite element meshes in the context of parallel numerical algorithms based on domain decomposition. A two-step approach is proposed, which combines a direct partitioning scheme with a non-deterministic procedure of combinatorial optimization. In contrast with previously published experiments with non-deterministic heuristics, the optimization step is shown to produce high-quality decompositions at a reasonable compute cost. We also show that the optimization approach can accommodate complex topological constraints and minimization objectives. This is illustrated by considering the particular case of topologically one-dimensional partitions, as well as load balancing of frontal subdomain solvers. Finally, the optimization procedure produces, in most cases, decompositions endowed with geometrically smooth interfaces. This contrasts with available partitioning schemes, and is crucial to some modern numerical techniques based on domain decomposition and a Lagrange multiplier treatment of the interface conditions.
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    Moving asymptotes and active set strategy for constrained optimization design in magnetostatic problems (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 1021-1030 
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    ISSN: 0029-5981
    Keywords: optimization ; finite element ; magnetostatic ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper, we present an improvement of the optimization technique of the moving asymptotes applied to a class of magnetostatic design problem. Our approach includes, among other aspects, an active set strategy which turns possible to find feasible points during the iterative process. We present some numerical results obtained on real-life case studies where the functions are computed by a complex finite-element routine.
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    Structural reliability optimization using an efficient safety index calculation procedure (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 1721-1738 
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    ISSN: 0029-5981
    Keywords: probabilistic analysis ; optimization ; safety index ; structural reliability ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The objective of this paper is to conduct reliability-based structural optimization in a multidisciplinary environment. An efficient reliability analysis is developed by expanding the limit functions in terms of intermediate design variables. The design constraints are approximated using multivariate splines in searching for the optimum. The reduction in computational cost realized in safety index calculation and optimization are demonstrated through several structural problems. This paper presents safety index computation, analytical sensitivity analysis of reliability constraints and optimization using truss, frame and plate examples.
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    SEMIANALYTICAL SINGULAR ELEMENT AND ITS APPLICATION TO STRESS CALCULATION AND OPTIMIZATION (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 1659-1680 
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    ISSN: 0029-5981
    Keywords: elasticity ; stress singularity ; finite elements ; optimization ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A semianalytical singular element is proposed to model the stress fields in plane and axisymmetric elastic bodies in the vicinity of singular points. The element generation is performed taking into account the structure of analytical solution in the vicinity of such points. This renders the element well suited for any type of singular points. Introduction of specially generated shape functions in the approximating expressions for displacements enables one to ensure the displacement compatibility with the standard elements. A detailed consideration is given to the convergence of the finite-element procedure. The extensive possibilities of the proposed singular element are exemplified by solving particular elastic problems. The applicability of the elaborated singular element is discussed with respect to optimization of geometry and material properties in the vicinity of singular points. Two optimization problems are presented to illustrate a search for the body geometry providing the optimal stress distribution.
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    COMPARATIVE EVALUATION OF DIFFERENT OPTIMIZATION ALGORITHMS FOR STRUCTURAL DESIGN APPLICATIONS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 1761-1774 
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    ISSN: 0029-5981
    Keywords: optimization ; algorithms ; structural ; design ; comparative ; evaluation ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Non-linear programming algorithms play an important role in structural design optimization. Fortunately, several algorithms with computer codes are available. At NASA Lewis Research Centre, a project was initiated to assess the performance of eight different optimizers through the development of a computer code CometBoards. This paper summarizes the conclusions of that research. CometBoards was employed to solve sets of small, medium and large structural problems, using the eight different optimizers on a Cray-YMP8E/8128 computer. The reliability and efficiency of the optimizers were determined from the performance of these problems. For small problems, the performance of most of the optimizers could be considered adequate. For large problems, however, three optimizers (two sequential quadratic programming routines, DNCONG of IMSL and SQP of IDESIGN, along with Sequential Unconstrained Minimizations Technique SUMT) outperformed others. At optimum, most optimizers captured an identical number of active displacement and frequency constraints but the number of active stress constraints differed among the optimizers. This discrepancy can be attributed to singularity conditions in the optimization and the alleviation of this discrepancy can improve the efficiency of optimizers.
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    A material based model for topology optimization of thermoelastic structures (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 1951-1965 
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    ISSN: 0029-5981
    Keywords: optimization ; thermoelasticity ; topology ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents the development of a computational model for the topology optimization problem, using a material distribution approach, of a 2-D linear-elastic solid subjected to thermal loads, with a compliance objective function and an isoperimetric constraint on volume. Defining formally the augmented Lagrangian associated with the optimization problem, the optimality conditions are derived analytically. The results of analysis are implemented in a computer code to produce numerical solutions for the optimal topology, considering the temperature distribution independent of design. The design optimization problem is solved via a sequence of linearized subproblems. The computational model developed is tested in example problems. The influence of both the temperature and the finite element model on the optimal solution obtained is analysed.
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    GENETIC ALGORITHMS AS AN APPROACH TO OPTIMIZE REAL-WORLD TRUSSES (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 361-382 
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    ISSN: 0029-5981
    Keywords: optimization ; genetic ; algorithms ; trusses ; real-world ; multicriteria ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Genetic algorithms, a search technique which combines Darwinian ‘survival-of-the-fittest’ with randomized well structured information, is applied to the problems of real-world truss optimization. In this work a population of binary strings or ‘chromosomes’, which represent the coded truss design variables, a ‘fitness’ as a ranking measure of the adaptability to the environment, selection criteria and mechanical natural operators such as crossover and mutation are used to improve the population, so that over the generations the genetic algorithm gets better and better and at the end of the convergence, a ‘rebirth’ of the population is used to improve the usual process.An overview of the genetic algorithm will be described, continuing the rebirth effect; then, the chromosome representation of trusses is exposed. Afterwards, the objective scalar function is defined taking into account that it seems reasonable in real world to optimize trusses in minimum weight trying, at the same time, to use the minimum number of cross-section types obtained from the market. It also seems reasonable to have the possibility to change the shape of the conceptual design, moving some joints. To simulate nearly real conditions, several load cases, constraints in the elastic joint displacements, ultimate tensile and elastic and plastic buckling in the bars have been taken into account. A hyperstatic 10 bars truss is subjected to a deep analysis in different situations in order to evaluate with other authors when possible as truss optimization with two criteria and buckling effect has not been found in specialized literature. A 160-bar transmission tower is also optimized.
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    OPTIMIZATION STRATEGIES IN UNSTRUCTURED MESH GENERATION (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 2055-2071 
    Details
    ISSN: 0029-5981
    Keywords: unstructured mesh generation ; optimization ; smoothing ; finite elements ; finite volume methods ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: We propose a new optimization strategy for unstructured meshes that, when coupled with existing automatic generators, produces meshes of high quality for arbitrary domains in 3-D. Our optimizer is based upon a non-differentiable definition of the quality of the mesh which is natural for finite element or finite volume users: the quality of the worst element in the mesh. The dimension of the optimization space is made tractable by restricting, at each iteration, to a suitable neighbourhood of the worst element. Both geometrical (node repositioning) and topological (reconnection) operations are performed. It turns out that the repositioning method is advantageous with respect to both the usual node-by-node techniques and the more recent differentiable optimization methods. Several examples are included that illustrate the efficiency of the optimizer.
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    OPTIMUM SHAPE DESIGN AND POSITIONING OF FEATURES USING THE BOUNDARY INTEGRAL EQUATION METHOD (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 1985-2003 
    Details
    ISSN: 0029-5981
    Keywords: shape design ; optimization ; boundary integral equation ; design sensitivity ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A design optimization procedure is developed using the boundary integral equation (BIE) method for linear elastostatic two-dimensional domains. Optimal shape design problems are treated where design variables are geometric parameters such as the positions and sizing dimensions of entire features on a component or structure. A fully analytical approach is adopted for the design sensitivity analysis where the BIE is implicitly differentiated. The ability to evaluate response sensitivity derivatives with respect to design variables such as feature positions is achieved through the definition of appropriate design velocity fields for these variables. How the advantages of the BIE method are amplified when extended to sensitivity analysis for this category of shape design problems is also highlighted. A mathematical programming approach with the penalty function method is used for solving the overall optimization problem. The procedure is applied to three example problems to demonstrate the optimum positioning of holes and optimization of radial dimensions of circular arcs on structures.
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    TWO ALGORITHMS FOR GLOBAL OPTIMIZATION OF GENERAL NLP PROBLEMS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 3305-3325 
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    ISSN: 0029-5981
    Keywords: global ; optimization ; algorithms ; nonlinear ; engineering ; design ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: After a brief overview of the methods from the literature, two new algorithms (zooming and domain elimination) for global optimization of general NLP problems are introduced. Operations analysis and stopping criteria for the methods are discussed. Numerical evaluation of the methods is carried out using a set of mathematical programming test problems. Performance of the methods is compared with the Controlled Random Search (CRS) and the Simulated Annealing (SA) methods. The methods are superior to SA for the test problems, as they are more robust, efficient and accurate. The CRS is more efficient than the new methods; however, it is applicable to unconstrained problems only. Therefore, it is concluded that the new methods are useful for engineering optimization applications.
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    Flaw identification using the boundary element method (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 399-419 
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    ISSN: 0029-5981
    Keywords: flaw identification ; boundary element method ; inverse analysis ; crack problems ; optimization ; sensitivity analysis ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper a new boundary element formulation is presented for the identification of the location and size of internal flaws in two-dimensional structures. An introduction to inverse analysis is given, with special reference to methods of flaw identification, along with a brief review of the optimization methods employed. Both the standard boundary element and the dual boundary element method are presented, with the dual boundary element method proposed as the basis for the new formulation. The flaw identification method is presented, along with the computation of the boundary displacement and traction derivatives and the specialized analytical integration used for cracked boundaries. Examples are given to demonstrate the accuracy of the sensitivity values and the performance of flaw location.
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    URL: http://dx.doi.org/10.1002/nme.1620380304
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    A SELF-SCALING IMPLICIT SQP METHOD FOR LARGE SCALE STRUCTURAL OPTIMIZATION (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 1933-1953 
    Details
    ISSN: 0029-5981
    Keywords: structures ; optimization ; large scale ; structural design ; sequential quadratic programming ; self-scaling ; numerical algorithms ; algorithm evaluation ; test problems ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The basic idea of an implicit sequential quadratic programming (ISQP) method for constrained problems is to use the approximate Hessian of the Lagrangian without explicitly calculating and storing it. This overcomes one of the major drawbacks of the traditional SQP method where a large matrix needs to be calculated and stored. This concept of an implicit method is explained and an algorithm based on it is presented. The proposed method extends a similar algorithm for unconstrained problems where a two-loop recursion formula is used for the inverse Hessian matrix. The present paper develops a similar algorithm for not only the constrained problem but also the direct Hessian updates. Several scaling procedures for the Hessian are also presented and evaluated. The basic method and some of its variations are evaluated using a set of mathematical programming test problems, and a set of structural design test problems - small to larger scale. The ISQP method performs much better than a method that does not use any approximate Hessian matrix. Its performance is better than the full SQP method for larger scale problems. The test results also show that an appropriate scaling of the Hessian can improve both efficiency and reliability substantially.
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    PREFORM DIE SHAPE DESIGN IN METAL FORMING USING AN OPTIMIZATION METHOD (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 1213-1230 
    Details
    ISSN: 0029-5981
    Keywords: metal forming ; preform design ; forging ; sensitivity analysis ; optimization ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An optimization algorithm for preform die shape design in metal-forming processes is developed in this paper. The preform die shapes are represented by cubic B-spline curves. The control points of the B-spline are used as the design variables. The optimization objective is to reduce the difference between the realized and desired final forging shapes. The sensitivities of the objective function with respect to the design variables are developed in detail. The numerical examples show that the optimization method and the sensitivity analysis developed in this paper are very useful and the design results are satisfactory. Importantly, the preform die shapes designed by this method are easily manufacturable and can be implemented in practical metal-forming operations. This optimization method and the sensitivity analysis can also be applied in the preform design of complex industrial metal-forming problems. © 1997 by John Wiley & Sons, Ltd.
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    A PROCEDURE FOR THE OPTIMAL SYNTHESIS OF PLANAR MECHANISMS BASED ON NON-LINEAR POSITION PROBLEMS (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 1505-1524 
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    ISSN: 0029-5981
    Keywords: linkages ; synthesis ; position problems ; optimization ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The present paper describes a procedure for the optimal dimensional synthesis of mechanisms which is based on the solution of non-linear position problems. Planar mechanisms are modelled very easily by means of finite elements of bi-hinged rod type. The judicious choice of constraint conditions makes possible the solution of classical position problems: initial, finite-displacement, deformed and static-equilibrium problems, as well as the main types of dimensional synthesis: path generation, functions, rigid body guidance, mixed, and multiple. A single synthesis error function applies to all these types, and moreover is general since it is valid for mechanisms of any configuration. This function is based on the idea that the best mechanism for the given synthesis conditions is the one that least needs to be deformed when it is obliged to satisfy them exactly, to which end the elastic deformation of the elements is permitted. © 1997 by John Wiley & Sons, Ltd.
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    OPTIMAL DESIGN WITH DISCRETE VARIABLES: SOME NUMERICAL EXPERIMENTS (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 165-188 
    Details
    ISSN: 0029-5981
    Keywords: engineering design ; optimization ; discrete variables ; numerical methods ; test problems ; evaluation of methods ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Continuous-discrete variable non-linear optimization problems are defined and categorized into six different types. These include a full range of problems from continuous to purely discrete and non-differentiable. Methods for solution of these problems are studied and their characteristics are catalogued. The branch and bound, simulated annealing and genetic algorithms are found to be the most general methods for solving discrete problems. After some enhancements, these and two other methods are implemented into a program for certain applications. Several example problems are solved to study performance of the methods. It is concluded that solution of the mixed variable non-linear optimization problems usually requires considerable more computational effort compared to the continuous variable optimization problems. In addition, there is no guarantee that the best solution has been obtained; however, good practical solutions are usually obtained. © 1997 by John Wiley & Sons, Ltd.
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    FINITE ELEMENT SOLUTION OF A MODEL FREE SURFACE PROBLEM BY THE OPTIMAL SHAPE DESIGN APPROACH (1997)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 40 (1997), S. 1525-1550 
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    ISSN: 0029-5981
    Keywords: adjoint problem ; discrete curvature ; finite element method ; free surface flow ; optimization ; quasi-Newton method ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Optimal shape design approach is applied to numerical computation of a model potential free boundary value problem. The problem is discretized using the finite element method. To test the approach the problem is formulated in both velocity potential and stream function formulation and four different finite element discretizations are used. Associated minimization problem is solved using the quasi-Newton method. Gradient of the cost function is computed by solving the algebraic adjoint equation. Gravity and surface tension forces are included in the model. Viability of the method is showed by solving problems with important effects of gravity and surface tension forces. © 1997 by John Wiley & Sons, Ltd.
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    MULTIVARIATE HERMITE APPROXIMATION FOR DESIGN OPTIMIZATION (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 787-803 
    Details
    ISSN: 0029-5981
    Keywords: multi-point approximations ; multivariate Hermite ; optimization ; design ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An approximation based on multiple function and gradient information is developed using Hermite interpolation concepts. The goal is to build a high-quality approximation for complex and multidisciplinary design optimization problems employing analysis such as aeroservoelasticity, structural control, probability, etc. The proposed multidimensional approximation utilizes exact analyses data generated during the course of iterative optimization. The approximation possesses the property of reproducing the function and gradient information of known data points. The accuracy of the new approach is compared with linear, reciprocal and other standard approximations. Because the proposed algorithm uses more data points, its efficiency has to be compared in the context of iterative optimization.
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    The MINLP optimization approach to structural synthesis. Part I: A general view on simultaneous topology and parameter optimization (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 263-292 
    Details
    ISSN: 0029-5981
    Keywords: structural synthesis ; optimization ; topology optimization ; mixed-integer nonlinear programming ; MINLP ; Modified OA/ER algorithm ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents the Mixed-Integer Non-linear Programming (MINLP) optimization approach to structural synthesis. Non-linear continuous/discrete non-convex problems of structural synthesis are proposed to be solved by means of simultaneous topology, parameter and standard dimension optimization.Part I of this three-part series of papers contains a general view of the MINLP approach to simultaneous topology and continuous parameter optimization. The MINLP optimization approach is performed through three steps. The first one includes the generation of a mechanical superstructure of different topology alternatives, the second one involves the development of an MINLP model formulation and the last one consists of a solution for the formulated MINLP problem. Some MINLP methods are also presented. A Modified OA/ER algorithm is applied to solve the MINLP problem and a simple example of a multiple cantilever beam is given to demonstrate the steps of the proposed MINLP optimization approach.As simultaneous optimization, extended to include also standard dimensions, requires additional effort, the development of suitable strategies to carry out the optimization is further discussed in Part II. The modelling of MINLP superstructures and the topology and parameter optimization of roller and sliding hydraulic steel gate structures are shown in Part III of the paper. An example of the synthesis of an already erected roller gate, i.e. the Intake Gate of Aswan II in Egypt, is presented as a comparative design research work. © 1998 John Wiley & Sons, Ltd.
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    The MINLP optimization approach to structural synthesis. Part III: synthesis of roller and sliding hydraulic steel gate structures (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 329-364 
    Details
    ISSN: 0029-5981
    Keywords: structural synthesis ; optimization ; topology optimization ; discrete variable optimization ; Mixed-Integer Non-linear Programming ; MINLP ; the Modified OA/ER algorithm ; MINLP strategy ; hydraulic gate ; sliding gate ; roller gate ; Aswan ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Part III of this three-part series of papers describes the synthesis of roller and sliding hydraulic steel gate structures performed by the Mixed-Integer Non-linear Programming (MINLP) approach. The MINLP approach enables the determination of the optimal number of gate structural elements (girders, plates), optimal gate geometry, optimal intermediate distances between structural elements and all continuous and standard crossectional sizes. For this purpose, special logical constraints for topology alterations and interconnection relations between the alternative and fixed structural elements are formulated. They have been embedded into a mathematical optimization model for roller and sliding steel gate structures GATOP. GATOP has been developed according to a special MINLP model formulation for mechanical superstructures (MINLP-MS), introduced in Parts I and II. The model contains an economic objective function of self-manufacturing and transportation costs of the gate. As the GATOP model is non-convex and highly non-linear, it is solved by means of the Modified OA/ER algorithm accompanied by the Linked Two-Phase MINLP Strategy, both implemented in the TOP computer code. An example of the synthesis is presented as a comparative design research work of the already erected roller gate, the so-called Intake Gate in Aswan II in Egypt. The optimal result yields 29·4 per cent of net savings when compared to the actual costs of the erected gate. © 1998 John Wiley & Sons, Ltd.
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    Response surface approximations for structural optimization (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 42 (1998), S. 517-534 
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    ISSN: 0029-5981
    Keywords: structural optimization ; optimization ; function approximation ; response surface methodology ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Response surface methodology can be used to construct global and midrange approximations to functions in structural optimization. Since structural optimization requires expensive function evaluations, it is important to construct accurate function approximations so that rapid convergence may be achieved. In this paper techniques to find the region of interest containing the optimal design, and techniques for finding more accurate approximations are reviewed and investigated. Aspects considered are experimental design techniques, the selection of the ‘best’ regression equation, intermediate response functions and the location and size of the region of interest. Standard examples in structural optimization are used to show that the accuracy is largely dependent on the choice of the approximating function with its associated subregion size, while the selection of a larger number of points is not necessarily cost-effective. In a further attempt to improve efficiency, different regression models were investigated. The results indicate that the use of the two methods investigated does not significantly improve the results. Finding an accurate global approximation is challenging, and sufficient accuracy could only be achieved in the example problems by considering a smaller region of the design space. © 1998 John Wiley & Sons, Ltd.
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    Merits and limitations of optimality criteria method for structural optimization (1995)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 38 (1995), S. 3087-3120 
    Details
    ISSN: 0029-5981
    Keywords: structures ; structural design ; optimization ; Lagrangian ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The merits and limitations of the Optimality Criteria (OC) method for the minimum weight design of structures subjected to multiple load conditions under stress, displacement and frequency constraints were investigated by examining several numerical examples. The examples were solved utilizing the OC design code that was developed for this purpose at the NASA Lewis Research Center. This OC code incorporates OC methods available in the literature with generalizations for stress constraints, fully utilized design concepts, and hybrid methods that combine both techniques. It includes multiple choices for Lagrange multiplier and design variable update methods, design strategies for several constraint types, variable linking, displacement and integrated force method analysers, and analytical and numerical sensitivities. On the basis of the examples solved, the optimality criteria for general application were found to be satisfactory for problems with few active constraints or with small numbers of design variables. However, the OC method without stress constraints converged to optimum even for large structural systems. For problems with large numbers of behaviour constraints and design variables, the method appears to follow a subset of active constraints that can result in a heavier design. The computational efficiency of OC methods appears to be similar to some mathematical programming techniques.
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    Dynamical quantum phase transitions in the Kitaev honeycomb model (2015)
    American Physical Society (APS)
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    Publication Date: 2015-08-11
    Description: Author(s): Markus Schmitt and Stefan Kehrein The notion of a dynamical quantum phase transition (DQPT) was recently introduced [Heyl et al. , Phys. Rev. Lett. 110 , 135704 (2013) ] as the nonanalytic behavior of the Loschmidt echo at critical times in the thermodynamic limit. In this work the quench dynamics in the ground state sector of the two… [Phys. Rev. B 92, 075114] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Creating and manipulating non-Abelian anyons in cold atom systems using auxiliary bosons (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Yuhe Zhang, G. J. Sreejith, and J. K. Jain The possibility of realizing bosonic fractional quantum Hall effect in ultracold atomic systems suggests a new route to producing and manipulating anyons, by introducing auxiliary bosons of a different species that capture quasiholes and thus inherit their nontrivial braiding properties. States with… [Phys. Rev. B 92, 075116] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Origin of strong dispersion in Hubbard insulators (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Y. Wang, K. Wohlfeld, B. Moritz, C. J. Jia, M. van Veenendaal, K. Wu, C.-C. Chen, and T. P. Devereaux Using cluster perturbation theory, we explain the origin of the strongly dispersive feature found at high binding energy in the spectral function of the Hubbard model. By comparing the Hubbard and t − J − 3 s model spectra, we show that this dispersion does not originate from either coupling to spin fluc… [Phys. Rev. B 92, 075119] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Logarithmic temperature dependence of samarium ion valence in the heavy-fermion Sm_{x} La_{1−x} Os_{4} Sb_{12} (2015)
    American Physical Society (APS)
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    Publication Date: 2015-08-11
    Description: Author(s): Kengo Fushiya, Ryoichi Miyazaki, Ryuji Higashinaka, Akira Yamada, Masaichiro Mizumaki, Satoshi Tsutsui, Kiyofumi Nitta, Tomoya Uruga, Bunya Suemitsu, Hideyuki Sato, and Yuji Aoki We have measured x-ray absorption spectra at the Sm L 3 edge to investigate the Sm-ion valence of ( S m x L a 1 − x ) O s 4 S b 12 , in which field-insensitive heavy-fermion behavior appears at low temperatures for x = 1 . It has been found that the Sm-ion valance shifts to 2 + with La ion substitution; from v = + 2.78 ( x = 1 ) … [Phys. Rev. B 92, 075118] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Su-Yang Xu, Chang Liu, I. Belopolski, S. K. Kushwaha, R. Sankar, J. W. Krizan, T.-R. Chang, C. M. Polley, J. Adell, T. Balasubramanian, K. Miyamoto, N. Alidoust, Guang Bian, M. Neupane, H.-T. Jeng, C.-Y. Huang, W.-F. Tsai, T. Okuda, A. Bansil, F. C. Chou, R. J. Cava, H. Lin, and M. Z. Hasan A three-dimensional (3D) Dirac semimetal is a novel state of quantum matter which has recently attracted much attention as an apparent 3D version of graphene. In this paper, we report results on the electronic structure of the 3D Dirac semimetal Na 3 Bi at a surface that reveals its nontrivial ground … [Phys. Rev. B 92, 075115] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Fermi-liquid theory for the single-impurity Anderson model (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Christophe Mora, Cătălin Paşcu Moca, Jan von Delft, and Gergely Zaránd We generalize Nozières' Fermi-liquid theory for the low-energy behavior of the Kondo model to that of the single-impurity Anderson model. In addition to the electrons' phase shift at the Fermi energy, the low-energy Fermi-liquid theory is characterized by four Fermi-liquid parameters: the two given … [Phys. Rev. B 92, 075120] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Resolving CuO chain and CuO_{2} plane contributions to the YBa_{2} Cu_{3} O_{7−δ} valence band by standing-wave excited hard x-ray photoelectron spectroscopy (2015)
    American Physical Society (APS)
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    Publication Date: 2015-08-11
    Description: Author(s): S. Thiess, T.-L. Lee, C. Aruta, C. T. Lin, F. Venturini, N. B. Brookes, B. C. C. Cowie, and J. Zegenhagen We analyzed the valence band (VB) of the 90 K high-temperature superconductor YBa 2 Cu 3 O 7 − δ by photoelectron spectroscopy under standing-wave excitation employing hard x rays. Precisely positioning the standing-wave intensity in the unit cell allows selectively probing the VB yield from the CuO chains… [Phys. Rev. B 92, 075117] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Resonant inelastic x-ray scattering on single magnons at oxygen K edges (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Beom Hyun Kim and Jeroen van den Brink The recent discovery that resonant inelastic x-ray scattering can probe single-magnon (SM) dispersions in transition metal (TM) oxides when the x-ray energy is tuned to the TM L edge has put this technique on a par with inelastic neutron scattering. It is generally presumed that selection rules forb… [Phys. Rev. B 92, 081105(R)] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Ultralong-range order in the Fermi-Hubbard model with long-range interactions (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Erik G. C. P. van Loon, Mikhail I. Katsnelson, and Mikhail Lemeshko We use the dual boson approach to reveal the phase diagram of the Fermi-Hubbard model with long-range dipole-dipole interactions. By using a large-scale finite-temperature calculation on a 64 × 64 square lattice we demonstrate the existence of a novel phase, possessing an “ultralong-range” order. The … [Phys. Rev. B 92, 081106(R)] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 71
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    Quantized topological magnetoelectric effect of the zero-plateau quantum anomalous Hall state (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Jing Wang, Biao Lian, Xiao-Liang Qi, and Shou-Cheng Zhang Motivated by the possibility of experimental detection of the topological magnetoelectric effect the authors put forth a theoretical proposal for its realization in the zero plateau quantum anomalous Hall state of a ferromagnet-topological insulator heterostructure. [Phys. Rev. B 92, 081107(R)] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Characterization of topological phase transitions via topological properties of transition points (2015)
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    Publication Date: 2015-08-11
    Description: Author(s): Linhu Li and Shu Chen We study topological properties of phase transition points of topological quantum phase transitions by assigning a topological invariant defined on a closed circle or surface surrounding the phase transition point in the parameter space of momentum and transition driving parameter. By applying our s… [Phys. Rev. B 92, 085118] Published Mon Aug 10, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Kondo physics in a Ni impurity embedded in O-doped Au chains (2015)
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    Publication Date: 2015-08-13
    Description: Author(s): S. Di Napoli, M. A. Barral, P. Roura-Bas, L. O. Manuel, A. M. Llois, and A. A. Aligia By means of ab initio calculations we study the effect of O doping of Au chains containing a nanocontact represented by a Ni atom as a magnetic impurity. In contrast to pure Au chains, we find that with a minimum O doping the 5 d x z , y z states of Au are pushed up, crossing the Fermi level. We also find… [Phys. Rev. B 92, 085120] Published Wed Aug 12, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 74
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    Chiral triplet superconductivity on the graphene lattice (2015)
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    Publication Date: 2015-08-13
    Description: Author(s): J. P. L. Faye, P. Sahebsara, and D. Sénéchal Motivated by the possibility of superconductivity in doped graphene sheets, we investigate superconducting order in the extended Hubbard model on the two-dimensional graphene lattice using the variational cluster approximation (VCA) and the cellular dynamical mean-field theory (CDMFT) with an exact … [Phys. Rev. B 92, 085121] Published Wed Aug 12, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Infinite matrix product states, boundary conformal field theory, and the open Haldane-Shastry model (2015)
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    Publication Date: 2015-07-30
    Description: Author(s): Hong-Hao Tu and Germán Sierra We show that infinite matrix product states (MPSs) constructed from conformal field theories can describe ground states of one-dimensional critical systems with open boundary conditions. To illustrate this, we consider a simple infinite MPS for a spin-1/2 chain and derive an inhomogeneous open Halda… [Phys. Rev. B 92, 041119(R)] Published Wed Jul 29, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Topological states in a microscopic model of interacting fermions (2015)
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    Publication Date: 2015-07-30
    Description: Author(s): Nicolai Lang and Hans Peter Büchler Motivated by the question of topological classification in interacting models the authors study an exactly solvable two-leg ladder model of spinless fermions with attractive interactions and find its ground states and correlation functions. They also demonstrate the appearance of topologically protected edge states and derive their braiding properties on a microscopic level. [Phys. Rev. B 92, 041118(R)] Published Wed Jul 29, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 77
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    Covalency in oxidized uranium (2015)
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    Publication Date: 2015-07-30
    Description: Author(s): J. G. Tobin, S.-W. Yu, R. Qiao, W. L. Yang, C. H. Booth, D. K. Shuh, A. M. Duffin, D. Sokaras, D. Nordlund, and T.-C. Weng Using x-ray emission spectroscopy and absorption spectroscopy, it has been possible to directly access the states in the unoccupied conduction bands that are involved with 5 f and 6 d covalency in oxidized uranium. By varying the oxidizing agent, the degree of 5 f covalency can be manipulated and monit… [Phys. Rev. B 92, 045130] Published Wed Jul 29, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 78
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    Large and small Fermi-surface spin density waves in the Kondo lattice model (2015)
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    Publication Date: 2015-08-04
    Description: Author(s): Robert Peters and Norio Kawakami We demonstrate the existence of metallic spin density waves (SDWs) in the Kondo lattice model on a square lattice for a wide range of parameters by means of real space dynamical mean-field theory. In these SDWs, the spin polarization as well as the charge density depend on the lattice site and are m… [Phys. Rev. B 92, 075103] Published Mon Aug 03, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Interactions along an entanglement cut in 2+1D Abelian topological phases (2015)
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    Publication Date: 2015-08-04
    Description: Author(s): Jennifer Cano, Taylor L. Hughes, and Michael Mulligan A given fractional quantum Hall state may admit multiple, distinct edge phases on its boundary. We explore the implications that multiple edge phases have for the entanglement spectrum and entropy of a given bulk state. We describe the precise manner in which the entanglement spectrum depends upon l… [Phys. Rev. B 92, 075104] Published Mon Aug 03, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 80
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    Pseudopotential for the electron-electron interaction (2015)
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    Publication Date: 2015-08-06
    Description: Author(s): J. H. Lloyd-Williams, R. J. Needs, and G. J. Conduit We propose a pseudopotential for the electron-electron Coulomb interaction to improve the efficiency of many-body electronic structure calculations. The pseudopotential accurately replicates the scattering properties of the Coulomb interaction, and recovers the analytical solution for two electrons … [Phys. Rev. B 92, 075106] Published Wed Aug 05, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 81
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    Non-Abelian phases in two-component ν=2/3 fractional quantum Hall states: Emergence of Fibonacci anyons (2015)
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    Publication Date: 2015-08-06
    Description: Author(s): Zhao Liu, Abolhassan Vaezi, Kyungmin Lee, and Eun-Ah Kim Recent theoretical insights into the possibility of non-Abelian phases in ν = 2 / 3 fractional quantum Hall states revived the interest in the numerical phase diagram of the problem. We investigate the effect of various kinds of two-body interlayer couplings on the (330) bilayer state and exactly solve … [Phys. Rev. B 92, 081102(R)] Published Wed Aug 05, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 82
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    NMR evidence of anisotropic Kondo liquid behavior in CeIrIn_{5} (2015)
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    Publication Date: 2015-08-06
    Description: Author(s): A. C. Shockley, K. R. Shirer, J. Crocker, A. P. Dioguardi, C. H. Lin, D. M. Nisson, N. apRoberts-Warren, P. Klavins, and N. J. Curro We report detailed Knight-shift measurements of the two indium sites in the heavy-fermion compound CeIrIn 5 as a function of temperature and field orientation. We find that the Knight-shift anomaly is orientation dependent, with a crossover temperature T * that varies by 50% as the field is rotated fr… [Phys. Rev. B 92, 085108] Published Wed Aug 05, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 83
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    Scanning tunneling microscopy of the charge density wave in 1T−TiSe_{2} in the presence of single atom defects (2015)
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    Publication Date: 2015-08-06
    Description: Author(s): A. M. Novello, B. Hildebrand, A. Scarfato, C. Didiot, G. Monney, A. Ubaldini, H. Berger, D. R. Bowler, P. Aebi, and Ch. Renner We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge density wave (CDW) in 1 T − TiSe 2 in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with native defect concentrations where some bul… [Phys. Rev. B 92, 081101(R)] Published Tue Aug 04, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 84
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    Thermodynamic consistency of the charge response in dynamical mean-field based approaches (2015)
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    Publication Date: 2015-08-06
    Description: Author(s): Erik G. C. P. van Loon, Hartmut Hafermann, Alexander I. Lichtenstein, and Mikhail I. Katsnelson We consider the thermodynamic consistency of the charge response function in the (extended) Hubbard model. In dynamical mean-field theory (DMFT), thermodynamic consistency is preserved. We prove that the static, homogeneous DMFT susceptibility is consistent as long as vertex corrections obtained fro… [Phys. Rev. B 92, 085106] Published Tue Aug 04, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 85
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    Renormalization group analysis of a neck-narrowing Lifshitz transition in the presence of weak short-range interactions in two dimensions (2015)
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    Publication Date: 2015-08-08
    Description: Author(s): Sedigh Ghamari, Sung-Sik Lee, and Catherine Kallin We study a system of weakly interacting electrons described by the energy dispersion ξ ( k ) = k x 2 − k y 2 − μ in two dimensions within a renormalization group approach. This energy dispersion exhibits a neck-narrowing Lifshitz transition at the critical chemical potential μ c = 0 where a van Hove singularity dev… [Phys. Rev. B 92, 085112] Published Thu Aug 06, 2015
    Keywords: Electronic structure and strongly correlated systems
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    t_{2g} -orbital model on a honeycomb lattice: Application to the antiferromagnet SrRu_{2} O_{6} (2015)
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    Publication Date: 2015-08-08
    Description: Author(s): Da Wang, Wan-Sheng Wang, and Qiang-Hua Wang Motivated by the recent discovery of high-temperature antiferromagnet SrRu 2 O 6 [Hiley et al. , Angew. Chem. Int. Ed. 53 , 4423 (2014) ; Tian et al. ,  arXiv:1504.03642 ] and its potential to be the parent of a new superconductor upon doping, we construct a minimal t 2 g -orbital model on a honeycomb lattice… [Phys. Rev. B 92, 075112] Published Fri Aug 07, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Dichroism as a probe for parity-breaking phases of spin-orbit coupled metals (2015)
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    Publication Date: 2015-08-08
    Description: Author(s): M. R. Norman Recently, a general formalism was presented for gyrotropic, ferroelectric, and multipolar order in spin-orbit coupled metals induced by spin-spin interactions. Here, I point out that the resulting order parameters are equivalent to expectation values of operators that determine natural circular dich… [Phys. Rev. B 92, 075113] Published Fri Aug 07, 2015
    Keywords: Electronic structure and strongly correlated systems
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  • 88
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    Transport properties for a quantum dot coupled to normal leads with a pseudogap (2015)
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    Publication Date: 2015-08-08
    Description: Author(s): Bunpei Hara, Akihisa Koga, and Tomosuke Aono We study transport properties for a quantum dot coupled to normal leads with a pseudogap density of states at zero temperature, using the second-order perturbation theory based on the Keldysh formalism. We clarify that the hybridization function Γ ( ω ) ∝ | ω | r ( 0 ≤ r 〈 1 ) induces the cusp or dip structure … [Phys. Rev. B 92, 081103(R)] Published Thu Aug 06, 2015
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    Determination of Tomonaga-Luttinger parameters for a two-component liquid (2015)
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    Publication Date: 2015-08-19
    Description: Author(s): Olabode M. Sule, Hitesh J. Changlani, Isao Maruyama, and Shinsei Ryu We provide evidence for the mapping of critical spin-1 chains, in particular the SU ( 3 ) symmetric bilinear-biquadratic model with additional interactions, to free boson theories using exact diagonalization and the density-matrix renormalization-group algorithm. Using the correspondence with a conform… [Phys. Rev. B 92, 075128] Published Tue Aug 18, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Large-gap quantum spin Hall states in decorated stanene grown on a substrate (2015)
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    Publication Date: 2015-08-19
    Description: Author(s): Yong Xu, Peizhe Tang, and Shou-Cheng Zhang Two-dimensional stanene is a promising candidate material for realizing a room-temperature quantum spin Hall (QSH) effect. Monolayer stanene has recently been fabricated by molecular beam epitaxy, but shows metallic features on a Bi 2 Te 3 (111) substrate, which motivates us to study the important influ… [Phys. Rev. B 92, 081112(R)] Published Tue Aug 18, 2015
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    Testing the nonlocal kinetic energy functional of an inhomogeneous, two-dimensional degenerate Fermi gas within the average density approximation (2015)
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    Publication Date: 2015-08-21
    Description: Author(s): J. Towers, B. P. van Zyl, and W. Kirkby In a recent paper [B. P. van Zyl et al. , Phys. Rev. A 89 , 022503 (2014) ], the average density approximation (ADA) was implemented to develop a parameter-free, nonlocal kinetic energy functional to be used in the orbital-free density functional theory of an inhomogeneous, two-dimensional (2D) Fermi … [Phys. Rev. B 92, 075129] Published Thu Aug 20, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Manifestations of topological band crossings in bulk entanglement spectrum: An analytical study for integer quantum Hall states (2015)
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    Publication Date: 2015-08-21
    Description: Author(s): Chi-Ken Lu, Dah-Wei Chiou, and Feng-Li Lin We consider integer quantum Hall states and calculate the bulk entanglement spectrum by formulating the correlation matrix in the guiding center representation. Our analytical approach is based on the strategy of redefining the inner product of states in the Hilbert space, via a projection operator,… [Phys. Rev. B 92, 075130] Published Thu Aug 20, 2015
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    Incomplete protection of the surface Weyl cones of the Kondo insulator SmB_{6} : Spin exciton scattering (2015)
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    Publication Date: 2015-08-21
    Description: Author(s): G. A. Kapilevich, P. S. Riseborough, A. X. Gray, M. Gulacsi, Tomasz Durakiewicz, and J. L. Smith The compound SmB 6 is a Kondo insulator, where the lowest-energy bulk electronic excitations are spin-excitons. It also has surface states that are subjected to strong spin-orbit coupling. It has been suggested that SmB 6 is also a topological insulator. Here we show that, despite the absence of time-… [Phys. Rev. B 92, 085133] Published Thu Aug 20, 2015
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    Real-space Eliashberg approach to charge order of electrons coupled to dynamic antiferromagnetic fluctuations (2015)
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    Publication Date: 2015-08-21
    Description: Author(s): Johannes Bauer and Subir Sachdev We study charge-ordered solutions for fermions on a square lattice interacting with dynamic antiferromagnetic fluctuations. Our approach is based on real-space Eliashberg equations, which are solved self-consistently. We first show that the antiferromagnetic fluctuations can induce arc features in t… [Phys. Rev. B 92, 085134] Published Thu Aug 20, 2015
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    Electronic spin susceptibilities and superconductivity in HgBa_{2} CuO_{4+δ} from nuclear magnetic resonance (2015)
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    Publication Date: 2015-08-25
    Description: Author(s): Damian Rybicki, Jonas Kohlrautz, Jürgen Haase, Martin Greven, Xudong Zhao, Mun K. Chan, Chelsey J. Dorow, and Michael J. Veit Nuclear magnetic resonance (NMR) experiments on single crystals of HgBa 2 CuO 4 + δ are presented that identify two distinct temperature-dependent spin susceptibilities: One is due to a spin component that is temperature-dependent above the critical temperature for superconductivity ( T c ) and reflects pse… [Phys. Rev. B 92, 081115(R)] Published Mon Aug 24, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Sr_{2} Ir_{1−x} Rh_{x} O_{4} (x〈0.5): An inhomogeneous j_{eff} =1/2 Hubbard system (2015)
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    Publication Date: 2015-08-25
    Description: Author(s): Shalinee Chikara, Daniel Haskel, Jae-Hoon Sim, Heung-Sik Kim, Cheng-Chien Chen, G. Fabbris, L. S. I. Veiga, N. M. Souza-Neto, J. Terzic, K. Butrouna, G. Cao, Myung Joon Han, and Michel van Veenendaal In a combined experimental and theoretical study, we investigate the properties of Sr 2 Ir 1 − x Rh x O 4 . From the branching ratios of the L -edge isotropic x-ray absorption spectra, we determine that the spin-orbit coupling is remarkably independent of x for both iridium and rhodium sites. DFT + U calculation… [Phys. Rev. B 92, 081114(R)] Published Mon Aug 24, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Spatially resolved Landau level spectroscopy of the topological Dirac cone of bulk-type Sb_{2} Te_{3} (0001): Potential fluctuations and quasiparticle lifetime (2015)
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    Publication Date: 2015-08-25
    Description: Author(s): C. Pauly, C. Saunus, M. Liebmann, and M. Morgenstern Using low-temperature scanning tunneling spectroscopy, we probe the Landau levels of the topologically protected state of Sb 2 Te 3 (0001) after in situ cleavage of a single crystal. Landau levels are visible for magnetic fields B ≥ 2 T at energies, which confirm the Dirac type dispersion including the ze… [Phys. Rev. B 92, 085140] Published Mon Aug 24, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi_{2} Se_{2} (2015)
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    Publication Date: 2015-08-25
    Description: Author(s): N. Xu, C. E. Matt, P. Richard, A. van Roekeghem, S. Biermann, X. Shi, S.-F. Wu, H. W. Liu, D. Chen, T. Qian, N. C. Plumb, M. Radović, Hangdong Wang, Qianhui Mao, Jianhua Du, Minghu Fang, J. Mesot, H. Ding, and M. Shi Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi 2 Se 2 as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position s… [Phys. Rev. B 92, 081116(R)] Published Mon Aug 24, 2015
    Keywords: Electronic structure and strongly correlated systems
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    Metal-insulator transition and local-moment collapse in FeO under pressure (2015)
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    Publication Date: 2015-08-25
    Description: Author(s): I. Leonov We employ a combination of the ab initio band-structure methods and dynamical mean-field theory to determine the electronic structure and phase stability of paramagnetic FeO at high pressure and temperature. Our results reveal a high-spin to low-spin transition within the B1 crystal structure of FeO… [Phys. Rev. B 92, 085142] Published Mon Aug 24, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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    Dynamic conductivity scaling in photoexcited V_{2} O_{3} thin films (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-08-19
    Description: Author(s): Elsa Abreu, Siming Wang, Juan Gabriel Ramírez, Mengkun Liu, Jingdi Zhang, Kun Geng, Ivan K. Schuller, and Richard D. Averitt Optical-pump terahertz-probe spectroscopy is used to investigate ultrafast far-infrared conductivity dynamics during the insulator-to-metal transition in vanadium sesquioxide ( V 2 O 3 ) . The resultant conductivity increase occurs on a tens of picosecond time scale, exhibiting a strong dependence on the … [Phys. Rev. B 92, 085130] Published Tue Aug 18, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
    Location Call Number Expected Availability
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