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991.
The evaluation of the density of states of a semiconductor disordered by a high density of impurities is considered by path integral methods. An effective momentum approximation and a cumulant approximation in momentum space are both used and graphical results for the density of states are presented. The results are applied to the evaluation of the static electrical mobility. It is found that this can be described by a Boltzmann like and non-Boltzmann like term and graphical results for the variation with Fermi energy of both these terms are given. 相似文献
992.
Colin Rogers 《Journal of Nonlinear Mathematical Physics》2014,21(1):74-88
A classical Korteweg capillarity system with a Karman-Tsien type (κ, ρ) constitutive relation is shown, via a Madelung transformation and use of invariants of motion, to admit integrable Hamiltonian subsystems. 相似文献
993.
994.
995.
The structural processing of metal–organic frameworks (MOFs) over multiple length scales is critical for their successful use as adsorbents in a variety of emerging applications. Although significant advances in molecular‐scale design have provided strategies to boost the adsorptive capacities of MOFs, relatively little attention has been directed toward understanding the influence of higher‐order structuralization on the material performance. Herein, we present the main strategies that are currently available for the structural processing of MOFs and discuss the influence these processes can impart on the adsorptive properties of the materials. In all, this intriguing area of research is expected to provide significant opportunities to enhance the properties of MOFs further, which will ultimately aid in their optimization in the context of specific real‐world applications. 相似文献
996.
Cameron Rogers Chen Chen Zahra Pedramrazi Dr. Arash A. Omrani Hsin‐Zon Tsai Han Sae Jung Dr. Song Lin Prof. Dr. Michael F. Crommie Prof. Dr. Felix R. Fischer 《Angewandte Chemie (International ed. in English)》2015,54(50):15143-15146
The thermally induced cyclodehydrogenation reaction of 6,6′‐bipentacene precursors on Au(111) yields peripentacene stabilized by surface interactions with the underlying metallic substrate. STM and atomic‐resolution non‐contact AFM imaging reveal rectangular flakes of nanographene featuring parallel pairs of zig‐zag and armchair edges resulting from the lateral fusion of two pentacene subunits. The synthesis of a novel molecular precursor 6,6′‐bipentacene, itself a synthetic target of interest for optical and electronic applications, is also reported. The scalable synthetic strategy promises to afford access to a structurally diverse class of extended periacenes and related polycyclic aromatic hydrocarbons as advanced materials for electronic, spintronic, optical, and magnetic devices. 相似文献
997.
Pulse dynamics and stability in optical fibers in the presence of both self-steepening and quintic nonlinear effects are analyzed. Propagating profiles of the quintic derivative nonlinear Schrodinger model are isolated via two invariants of motion. The resulting canonical equation admits exact periodic propagating patterns in terms of the Jacobi elliptic functions, and solitary pulses are recovered in the long wave limit, i.e. degenerate cases of periodic profiles where each pulse is widely separated from the adjacent ones. Two families of such exact wave profiles are identified. The first one has a precise constraint concerning the magnitude of self-steepening and quintic nonlinear effects, while the second one permits more freedom. The reduction to the well established temporal soliton in an optical fiber waveguide in the absence of self-steepening and quintic nonlinearity is demonstrated explicitly. Numerical simulations are performed to identify regimes of parameter values where robust propagation patterns exist. 相似文献
998.
Keith M. Rogers 《Proceedings of the American Mathematical Society》2005,133(12):3525-3534
We prove a version of van der Corput's lemma for polynomials over the -adic numbers.
999.
A. Ceulemans R.B. King S.A. Bovin K.M. Rogers A. Troisi P.W. Fowler 《Journal of mathematical chemistry》1999,26(1-3):101-123
We introduce the pollakispolyhedral groups and describe in detail the representational structure of PSL(2,7) or 7
O, the automorphism group of the Klein graph composed of 56 trivalent vertices arranged in 24 heptagonal faces. Leapfrog and
quadruple transformations of the graph are described and their eigenvalue spectra derived. Considered as carbon frameworks
on the “plumber's nightmare” surface these chiral structures exhibit significant steric strain which prevents the molecular
realisation of the Klein symmetry.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
1000.