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  • Articles  (88)
  • Springer  (76)
  • American Institute of Physics (AIP)  (12)
  • 2015-2019  (40)
  • 2010-2014  (30)
  • 1990-1994  (18)
  • Chemistry and Pharmacology  (69)
  • Mathematics  (19)
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  • Articles  (88)
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  • 1
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    Colloids exposed to random potential energy landscapes: From particle number density to particle-potential and particle-particle interactions (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-07-29
    Description: Colloidal particles were exposed to a random potential energy landscape that has been created optically via a speckle pattern. The mean particle density as well as the potential roughness, i.e., the disorder strength, were varied. The local probability density of the particles as well as its main characteristics were determined. For the first time, the disorder-averaged pair density correlation function g (1) ( r ) and an analogue of the Edwards-Anderson order parameter g (2) ( r ), which quantifies the correlation of the mean local density among disorder realisations, were measured experimentally and shown to be consistent with replica liquid state theory results.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Diatomic molecules, rotations, and path-integral Monte Carlo simulations: N2 and H2 on graphite (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 6031-6051 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational motion of homonuclear diatomic molecules confined to two dimensions at finite temperatures is discussed within the framework of path-integral Monte Carlo (PIMC) techniques. For single rotators the symmetry restriction on the total wave function coupling nuclear spin and rotations of these diatomic molecules is carried over to PIMC for fermionic and bosonic diatomic molecules. Three experimentally relevant quantum statistical averages are formulated, and quantum effects due to discrete level spacing and exchange are separated with the help of these averages. The method is applied to single N2 and H2 rotators adsorbed on graphite in the frozen-in crystal field which is due to the commensurate ((square root of)3×(square root of)3)R30° "2-in'' herringbone phase. Contrary to H2, exchange effects are negligible for N2 in the relevant temperature range. The resulting sign problem for certain combinations of molecule and averaging procedure is discussed. PIMC simulations of the phase transition from the translationally (square root of)3-ordered and orientationally disordered phase to the herringbone phase were carried out for complete N2 monolayers without a symmetry restriction on the wave function. Due to dispersive quantum fluctuations, transition temperature and ground-state order parameter are depressed by roughly 10% as compared to classical MC simulations of the same realistic model. In addition, the PIMC results are compared to quasiharmonic and quasiclassical approximations. The quasiharmonic treatment yields the correct order parameter suppression, the quasiclassical simulation the lowering of the transition temperature, but only the full quantum PIMC simulations describe the entire temperature range of interest correctly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466186
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  • 3
    Electronic Resource
    Electronic Resource
    The semiclassical limit of the two-dimensional quantum Yang–Mills model (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 5354-5361 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The semiclassical limit of the quantum Yang–Mills partition function on a compact oriented surface is related to the symplectic volume of the moduli space of flat connections, by using an explicit expression for the symplectic form. This gives an independent proof of some recent results of Witten and Forman.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530756
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  • 4
    Electronic Resource
    Electronic Resource
    An explicit description of the symplectic structure of moduli spaces of flat connections (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 5338-5353 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The moduli space of flat connections on a principal G-bundle over a compact oriented surface of genus g≥1 is considered herein. Using the holonomies around noncontractible loops, the moduli space is described as a quotient of a submanifold of G2g. An explicit expression is obtained for the symplectic form on the smooth part of moduli space, and several properties of this form are established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530755
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  • 5
    Electronic Resource
    Electronic Resource
    Role of the HNO3↔NOH Isomerization in reactions (i) NH(3Σ−)+O(3P) and (ii) N(4S)+OH(2Π): Ab initio calculations and quantum statistical Rice–Ramsperger–Kassel analysis of the potential energy surfaces (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3906-3915 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The minimum energy potential energy surfaces for combination of NH(3Σ−)+O(3P) to form HNO(1A',3A‘) and N(4S)+OH(2Π) to form NOH(3A‘), and the isomerization of HNO(1A',3A‘) to NOH(1A',3A‘), decomposition of NOH(1A',3A‘) to N(4S)+OH(2Π) as well as to H(2S)+NO(2Π) and HNO(3A‘) to H(2S)+NO(2Π) have been obtained by the ab initio methods with geometry optimization at the 6–311G**/MP2=full level with corrections for electron correlation at the MP4SDTQ=full level. At all stationary points on the potential energy surfaces (PES), correction for the zero point vibrational energies are made. The addition reactions to form energized adducts have then been analyzed using a bimolecular version of the quantum statistical Rice–Ramsperger–Kassel (QRRK) theory at different temperatures and pressures. Our analysis predicts that at all temperatures isomerization of HNO(3A‘) to NOH(3A‘) and its reverse isomerization are important. Formation of NO(2Π) in the interstellar clouds can take place from decomposition of NOH(3A‘) as well as HNO(3A‘).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467508
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrafast nonexponential dynamics in a polymer glass forming liquid (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 1673-1683 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The orientational dynamics of phenyl side groups in poly(methylphenylsiloxane) (PMPS) melts are examined over a broad range of viscosity/temperature (η/T) using subpicosecond transient grating optical Kerr effect (TGOKE) measurements. Measurements on poly(dimethylsiloxane) are also reported. Following ultrafast (hundreds) of fs librational dynamics, the phenyl side group orientational dynamics occur over a range of times from 2 ps to a few hundred ps. The experiments were performed from 25 to 143 °C, resulting in η/T changing by a factor of 40. In spite of the large change in η/T, the side group dynamics remain unchanged throughout the entire temperature range. Comparison of the dynamics of PMPS in the melt and PMPS in dilute CCl4 solution shows that chain–chain interactions influence the phenyl side group dynamics in the melt. The dynamics are described as local orientational relaxation of phenyl groups in the microenvironments defined by the backbone geometry and side group steric interactions rather than rotational diffusion. The dynamics exhibit power-law behavior, t−α, over two decades of signal decay. Two possible physical processes that can give rise to a power-law decay are discussed. The relationship of the observed dynamics to the β and α relaxations of glass forming liquids is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466595
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  • 7
    Electronic Resource
    Electronic Resource
    Optimal tests for no contamination in symmetric multivariate normal mixtures (1993)
    Springer
    Annals of the Institute of Statistical Mathematics 45 (1993), S. 137-146 
    Details
    ISSN: 1572-9052
    Keywords: Intraclass correlation coefficient ; locally most powerful similar test ; mixture distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract SenGupta and Pal (1991,J. Statist. Plann. Inference,29, 145–155) have recently obtained the locally optimal test for zero intraclass correlation coefficient in symmetric multivariate normal mixtures, with known mixing proportion, for the case when the common mean,m, and the common variance, σ2, are known. Here, we establish that even under the general situation, when some or none ofm and σ2 are known, simple optimal tests can be derived, which are locally most powerful similar, whose exact cut-off points are already available and which retain all the previous optimality properties, e.g. unbiasedness, monotonicity and consistency. Some power tables are presented to demonstrate the favorable performances of these tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773674
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  • 8
    Electronic Resource
    Electronic Resource
    The influence curve approach in data envelopment analysis (1991)
    Springer
    Mathematical programming 52 (1991), S. 147-166 
    Details
    ISSN: 1436-4646
    Keywords: Data envelopment analysis ; sensitivity and robustness of optimal solutions ; nonlinear efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The behavior of efficiency in the stochastic DEA model is examined here in terms of the influence curve approach which quantifies the influence of observed data on the empirical fit of the production frontier. Data influence is analyzed here through robustness. Two types of robustness and sensitivity issues are analyzed here in terms of (a) a new class of minimax measures, and (b) a set nonlinear efficiency measures and it is shown through empirical applications that in suitable cases these measures outperform the conventional ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01582884
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  • 9
    Electronic Resource
    Electronic Resource
    Krichever-Novikov formulation of topological conformal field theory (1991)
    Springer
    Letters in mathematical physics 23 (1991), S. 271-277 
    Details
    ISSN: 1573-0530
    Keywords: 81T40 ; 81T60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The Krichever-Novikov (KN) global operator formalism is applied to construct a topological conformal field theory on a compact Riemann surface from an N=2 super-conformal field theory. The topological version of the KN algebra is derived and the BRST charge is shown to be genus-dependent in this formulation. This leads to an interesting cohomology structure for the physical subspace of the Hilbert space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398824
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  • 10
    Electronic Resource
    Electronic Resource
    Krichever-Novikov global operator formalism: NSR superstring in curved background (1991)
    Springer
    Communications in mathematical physics 139 (1991), S. 527-549 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The Neveu-Schwarz-Ramond type II closed superstring is considered to evolve in a curved space-time manifold. The Krichever-Novikov global operator formalism is used to construct the generators of a super-conformal algebra on a Riemann surface Σ. The computation for the quantum algebra of these generators is explicitly presented. It is shown that the theory is free from super-conformal anomalies if the target manifold is ten dimensional and satisfies the Ricci flatness condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101878
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