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  • 1
    Electronic Resource
    Electronic Resource
    Random sequential adsorption: Series and virial expansions (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8252-8257 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We introduce an operator formalism for random sequential adsorption on lattices and in continuous space. This provides a convenient framework for deriving series expansions for the deposition rate dθ/dt in powers of t. Several specific examples—the square lattice with nearest-neighbor exclusion, and with exclusion extended to next-nearest neighbors, and disks and oriented squares on the plane—are considered in detail. Precise estimates for θ(t) and the jamming coverage are obtained via Padé approximant analysis. These are found to be in excellent agreement with simulation results. A diagrammatic expansion for dθ/dt is derived, and its relation to the equilibrium Mayer series is elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460109
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  • 2
    Electronic Resource
    Electronic Resource
    Wetting transitions in polymer blends: A Monte Carlo lattice simulation (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8537-8541 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Wetting transitions of binary polymer mixtures in contact with a wall were studied using lattice models by the method of Monte Carlo simulation. First-order wetting transitions were found below the critical temperature but at a moderately high volume fraction of the polymer type favored by the wall. The transitions appear to be second order at low temperatures or for short chain lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460087
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  • 3
    Electronic Resource
    Electronic Resource
    Wetting transitions in polymer blends: Comparison between simulation and theory (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3849-3858 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate the problem of wetting transitions in polymer blends near a hard surface or wall by using a Monte Carlo technique to study the wetting transition along a path of increasing surface chemical potential. We introduce a parameter εs which describes the monomer–monomer interactions in the layer adjacent to the wall. This parameter is shown to behave similarly to the parameter g, used in mean field theory to describe the change in monomer–monomer interactions due to the wall. We identify a wetting tricritical point which may be defined either with respect to εs or the bulk density. For bulk densities less than the tricritical bulk density we obtain first-order transitions while for bulk densities greater than the tricritical bulk density we obtain critical wetting transitions, in accordance with mean-field theory. We also show how the molecular weight of the polymer can be varied to obtain first-order or critical wetting, as desired. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472205
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  • 4
    Electronic Resource
    Electronic Resource
    A Monte Carlo study of wetting transitions in polymer blends confined to a capillary (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 5294-5303 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate the problem of wetting transitions in polymer blends confined to a slitlike adsorbing capillary of thickness H by Monte Carlo methods. Two paths for capillary wetting are considered, either along a path of increasing temperature, T, or increasing surface chemical potential, μ1. We find that H can be thought of as an additional thermodynamic parameter which controls the nature of the transitions. We find that there exists a capillary critical separation, Hc. For separations less than Hc the blend falls in the one phase region of the phase diagram. Above Hc there exists a separation Hbulk, where the polymer blend begins to show bulk behavior. Hbulk is shown to separate regions of first order transitions (H〈Hbulk) from critical wetting transitions (H≥Hbulk). Along a path of constant T and increasing μ1 we find for 2ξ〈H1〈H2〈Hbulk that the first-order transitions between the two separations is shifted according to μc1(H2)−μc1(H1)∝1/H1−1/H2. We discuss the implications of these results for the case of H→∞ and compare them with theoretical results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471258
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  • 5
    Electronic Resource
    Electronic Resource
    Why L12 intermetallics are brittle and how to make them ductile (1998)
    Springer
    Journal of computer-aided materials design 4 (1998), S. 157-163 
    Details
    ISSN: 1573-4900
    Keywords: Intermetallics ; Brittle fracture ; Ductility ; Dislocations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Origins of the intrinsic and extrinsic brittleness of L12 intermetallics are analyzed. It is shown that the intrinsic behavior is determined by the dislocation process in the alloy, and that the extrinsic behavior is related to moisture-induced embrittlement. Converting DO22 structure to L12 structure does not necessarily yield a ductile alloy. To improve the intrinsic ductility, the alloying element must be able to change the bonding nature so that the glissile complex stacking fault-coupled dissociation of superdislocations is promoted, while an improvement in the extrinsic ductility might be achieved by partially replacing the light element in the alloy with a heavier alloying element.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008622503735
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  • 6
    Electronic Resource
    Electronic Resource
    Indentation Testing of a Bone Defect Filled with Two Different Injectable Bone Substitutes (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 89-92 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Injectable bone substitutes (IBS) based on calcium phosphate (CaP) and/or calcium sulphate (CaS) are used as fillers in bone defects to stimulate bone integration and allow mechanical loading. Two types of IBS, IBS-1 is CaP+20%CaS and IBS-2 is CaS+40% hydroxyapatite, were investigated. The materials were injected into holes in the femur and tibia in rabbits. After 10 weeks the femora weresubjected to indentation testing and tibiae were prepared for histology evaluation. IBS-1 lead to an higher indentation load compared to control, that is no material inserted, while IBS-2 showed no significant difference between material and control. Histology showed that with IBS-1, the bone penetrated into and integrated with the material in the defect. With IBS-2, new bone grew into the outer 0.5-1.0 mm. The materials could be used for different indications, such as to support fracture healing or in contained cavities
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.89.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Modeling generalized stacking faults in Au using the tight-binding potential combined with a simulated annealing method (2002)
    Springer
    The European physical journal 28 (2002), S. 45-48 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.72.Nn Stacking faults and other planar or extended defects – 71.15.Nc Total energy and cohesive energy calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The tight-binding potential combined with a simulated annealing method is used to study the generalized stacking fault (GSF) structure and corresponding energy of gold. The potential is chosen to fit band structures and total energies from a set of first-principle calculations [Phys. Rev. B 54, 4519 (1996)]. It is found that the relaxed stacking fault energy (SFE) and unstable SFE are equal to 46 and 102 mJ/m2, respectively, and are in good agreement with first principles calculations and experiment. In addition, the structure properties of the relaxed GSF of metal Au are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00197-6
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  • 8
    Electronic Resource
    Electronic Resource
    Phase transitions and universality in nonequilibrium steady states of stochastic Ising models (1988)
    Springer
    Journal of statistical physics 51 (1988), S. 893-906 
    Details
    ISSN: 1572-9613
    Keywords: Nonequilibrium stationary states ; phase transitions ; universality ; Monte Carlo simulation ; Monte Carlo renormalization group ; voter model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present results of direct computer simulations and of Monte Carlo renormalization group (MCRG) studies of the nonequilibrium steady states of a spin system with competing dynamics and of the voter model. The MCRG method, previously used only for equilibrium systems, appears to give useful information also for these nonequilibrium systems. The critical exponents are found to be of Ising type for the competing dynamics model at its second-order phase transitions, and of mean-field type for the voter model (consistent with known results for the latter).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014891
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  • 9
    Electronic Resource
    Electronic Resource
    Finite-size effects at critical points with anisotropic correlations: Phenomenological scaling theory and Monte Carlo simulations (1989)
    Springer
    Journal of statistical physics 55 (1989), S. 87-126 
    Details
    ISSN: 1572-9613
    Keywords: Finite-size scaling ; anisotropic systems ; Lifshitz points ; driven Kawasaki model ; nonequilibrium phase transitions ; Monte Carlo simulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Various thermal equilibrium and nonequilibrium phase transitions exist where the correlation lengths in different lattice directions diverge with different exponentsv ‖,v ⊥: uniaxial Lifshitz points, the Kawasaki spin exchange model driven by an electric field, etc. An extension of finite-size scaling concepts to such anisotropic situations is proposed, including a discussion of (generalized) rectangular geometries, with linear dimensionL ‖ in the special direction and linear dimensionsL ⊥ in all other directions. The related shape effects forL ‖≠L ⊥ but isotropic critical points are also discussed. Particular attention is paid to the case where the generalized hyperscaling relationv ‖+(d−1)v ⊥=γ+2β does not hold. As a test of these ideas, a Monte Carlo simulation study for shape effects at isotropic critical point in the two-dimensional Ising model is presented, considering subsystems of a 1024x1024 square lattice at criticality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01042592
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  • 10
    Electronic Resource
    Electronic Resource
    Computer simulation of driven diffusive systems with exchanges (1989)
    Springer
    Journal of statistical physics 56 (1989), S. 783-819 
    Details
    ISSN: 1572-9613
    Keywords: Driven Kawasaki models ; stochastic lattice gas ; non-equilibrium phase transitions ; computer simulations ; finite-size scaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The field-driven Kawasaki model with a fractionp admixture of Glauber dynamics is studied by computer simulation:p=0 corresponds to the order-parameter-onserving driven diffusive system, whilep=1 is the equilibrium Ising model. Forp=0.1 our best estimates of critical exponents based on a system of size 4096×128 areβ≈0.22, ηRS≈0.45, andv ‖≈v ⊥≈1. These exponents differ from both the values predicted by a field-theoretic method forp=0 and those of the equilibrium Ising model. Anisotropic finite-size scaling analyses are carried out, both for subsystems of the large system and for fully periodic systems. The results of the latter, however, are inconsistent, probably due to the complexity of the size effects. This leaves open the possibility that we are in a crossover regime fromp=0 top≠0 and that our critical exponents are “effective ones.” Forp=0 our results are consistent with the predictionsv ‖〉v ⊥.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01016780
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