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21.
In recent years, domain decomposition methods have attracted much attention due to their successful application to many elliptic
and parabolic problems. Domain decomposition methods treat problems based on a domain substructuring, which is attractive
for parallel computation, due to the independence among the subdomains. In principle, domain decomposition methods may be
applied to the system resulting from a standard discretization of the parabolic problems or, directly, be carried out through
a discretization of parabolic problems. In this paper, a direct domain decomposition method is introduced to discretize the
parabolic problems. The stability and convergence of this algorithm are analyzed.
This work was supported in part by Polish Sciences Foundation under grant 2P03A00524.
This work was supported in part by the US Department of Energy under Contracts DE-FG02-92ER25127 and by the Director, Office
of Science, Advanced Scientific Computing Research, U.S. Department of Energy under contract DE-AC02-05CH11231. 相似文献
22.
Summary. Multilevel preconditioners are proposed for the iterative solution of the discrete problems which arise when orthogonal spline
collocation with piecewise Hermite bicubics is applied to the Dirichlet boundary value problem for a self-adjoint elliptic
partial differential equation on a rectangle. Additive and multiplicative preconditioners are defined respectively as sums
and products of independent operators on a sequence of nested subspaces of the fine partition approximation space. A general
theory of additive and multiplicative Schwarz methods is used to prove that the preconditioners are spectrally equivalent
to the collocation discretization of the Laplacian with the spectral constants independent of the fine partition stepsize
and the number of levels. The preconditioned conjugate gradient and preconditioned Orthomin methods are considered for the
solution of collocation problems. An implementation of the methods is discussed and the results of numerical experiments are
presented.
Received March 1, 1994 / Revised version received January 23, 1996 相似文献
23.
Dominiak PM Makal A Mallinson PR Trzcinska K Eilmes J Grech E Chruszcz M Minor W Woźniak K 《Chemistry (Weinheim an der Bergstrasse, Germany)》2006,12(7):1941-1949
The electron density distributions in crystals of five previously studied DMAN complexes and five Schiff bases (two new ones) have been analysed in terms of various properties of bond critical points (BCPs) found in the pair-wise interactions in their lattices. We analysed the continua of interactions including covalent/ionic bonds as well as hydrogen bonds and all other types of weak interactions for all pairs of interacting atoms. The charge density at BCPs and local kinetic and potential energy densities vary exponentially with internuclear distance (or other measures of separation). The parameters of the dependences appear to be characteristics of particular pairs of atom types. The Laplacian and the total (sum of kinetic and potential) energy density at BCPs show similar behaviour with the dependence being of the Morse type. The components lambda1, lambda2, lambda3 of the Laplacian at BCPs vary systematically with internuclear distance according to the type of atom pair. For lambda1 and lambda2 the distribution is of the exponential type, whereas lambda3 does not seem to follow any simple functional form, consistent with previous theoretical findings. Analytical nonlinear dependences of Laplacian on charge density have been found. They agree reasonably well with those obtained by least square fit of the Laplacian to charge density data. There are four distinct regions of the [symbol: see text]2rho(BCP)/rho(BCP) space, generated by E(BCP) = 0 and G(BCP)/rho(BCP) = 1 conditions. Two regions clearly correspond to the shared-shell and closed-shell interactions and the other two to some intermediate situation. 相似文献
24.
25.
Dryjański P 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2001,57(3):461-468
Applicability of the Gaussian and Lorentzian function to spectral bands is analyzed, and some problems of band area determination are discussed. 相似文献
26.
Katarzyna D. Koclega Maksymilian Chruszcz Anna Gawlicka‐Chruszcz Marcin Cymborowski Wladek Minor 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(2):o114-o116
3‐(1‐Pyridinio)propanesulfonate, C8H11NO3S, and 3‐(benzyldimethylammonio)propanesulfonate monohydrate, C12H19NO3S·H2O, used as additives during protein refolding and crystallization, both crystallize in the monoclinic system in the P21/c space group, with one molecule (or one set of molecules) per asymmetric unit. The solvent water molecule present in the second crystal structure results in the formation of a dimer through hydrogen bonds. The conformation of the propanesulfonate moiety is similar in both structures. 相似文献
27.
Maksymilian Chruszcz Marcin Cymborowski Anna Gawlicka‐Chruszcz Shoichi Yasukawa Joseph D. Ferrara Wladek Minor 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(12):o868-o871
The crystal structures of the title compounds, (S)‐1‐carboxy‐3‐(methylsulfanyl)propanaminium chloride, C5H12NO2S+·Cl−, and (S)‐1‐carboxy‐3‐(methylselanyl)propanaminium chloride, C5H12NO2Se+·Cl−, are isomorphous. The protonated l ‐methionine and l ‐selenomethionine molecules have almost identical conformations and create very similar contacts with the Cl− anions in the crystal structures of both compounds. The amino acid cations and the Cl− anions are linked viaN—H⋯Cl− and O—H⋯Cl− hydrogen bonds. 相似文献
28.
Maksymilian Ignaczak Andrzej Grzejdziak 《Monatshefte für Chemie / Chemical Monthly》1984,115(8-9):943-952
The composition and the complex formation constants of Ag(I) with pyridine, 2,2′-bipyridine, and 1,10-phenanthroline were determined by the potentiometric method. The measurement procedure can be reduced to the determination of the EMF of the concentration cell: $$\begin{gathered} Ag|c_1 AgNO_3 (AN) + 0.1 M(C_2 H_5 )_4 NClO_4 (AN)||0.1 M(C_2 H_5 )_4 NClO_4 (AN) || \hfill \\ c_2 AgNO_3 (AN) + x L(AN) + 0.1 M (C_2 H_5 )_4 NClO_4 (AN)|Ag. \hfill \\ \end{gathered}$$ All complexes have coordination number 2. The solubility product for Ag(1,10-phenanthroline)2NO3 in acetonitrile was also determined. In all measurements the association of AgNO3 was considered. Differences in the stability of analogous complexes in water and acetonitrile are discussed. 相似文献
29.
Gemeng Liang Zhibin Wu Christophe Didier Wenchao Zhang Jing Cuan Baohua Li Kuan‐Yu Ko Po‐Yang Hung Cheng‐Zhang Lu Yuanzhen Chen Grzegorz Leniec Sawomir Maksymilian Kaczmarek Bernt Johannessen Lars Thomsen Vanessa K. Peterson Wei Kong Pang Zaiping Guo 《Angewandte Chemie (International ed. in English)》2020,59(26):10594-10602
Spinel LiNi0.5Mn1.5O4 (LNMO) is a promising cathode candidate for the next‐generation high energy‐density lithium‐ion batteries (LIBs). Unfortunately, the application of LNMO is hindered by its poor cycle stability. Now, site‐selectively doped LNMO electrode is prepared with exceptional durability. In this work, Mg is selectively doped onto both tetrahedral (8a) and octahedral (16c) sites in the Fd m structure. This site‐selective doping not only suppresses unfavorable two‐phase reactions and stabilizes the LNMO structure against structural deformation, but also mitigates the dissolution of Mn during cycling. Mg‐doped LNMOs exhibit extraordinarily stable electrochemical performance in both half‐cells and prototype full‐batteries with novel TiNb2O7 counter‐electrodes. This work pioneers an atomic‐doping engineering strategy for electrode materials that could be extended to other energy materials to create high‐performance devices. 相似文献
30.
Andrea OMalley Swanandi Pote Ivana Giangrieco Lisa Tuppo Anna Gawlicka-Chruszcz Krzysztof Kowal Maria Antonietta Ciardiello Maksymilian Chruszcz 《Molecules (Basel, Switzerland)》2021,26(2)
(1) Background: Non-specific lipid transfer proteins (nsLTPs), which belong to the prolamin superfamily, are potent allergens. While the biological role of LTPs is still not well understood, it is known that these proteins bind lipids. Allergen nsLTPs are characterized by significant stability and resistance to digestion. (2) Methods: nsLTPs from gold kiwifruit (Act c 10.0101) and pomegranate (Pun g 1.0101) were isolated from their natural sources and structurally characterized using X-ray crystallography (3) Results: Both proteins crystallized and their crystal structures were determined. The proteins have a very similar overall fold with characteristic compact, mainly α-helical structures. The C-terminal sequence of Act c 10.0101 was updated based on our structural and mass spectrometry analysis. Information on proteins’ sequences and structures was used to estimate the risk of cross-reactive reactions between Act c 10.0101 or Pun g 1.0101 and other allergens from this family of proteins. (4) Conclusions: Structural studies indicate a conformational flexibility of allergens from the nsLTP family and suggest that immunoglobulin E binding to some surface regions of these allergens may depend on ligand binding. Both Act c 10.0101 and Pun g 1.0101 are likely to be involved in cross-reactive reactions involving other proteins from the nsLTP family. 相似文献