全文获取类型
收费全文 | 120篇 |
免费 | 4篇 |
专业分类
化学 | 14篇 |
力学 | 21篇 |
数学 | 57篇 |
物理学 | 32篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 5篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 8篇 |
2014年 | 5篇 |
2013年 | 2篇 |
2012年 | 5篇 |
2011年 | 5篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 2篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1975年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有124条查询结果,搜索用时 15 毫秒
1.
N. G. Marchuk 《Russian Journal of Mathematical Physics》2006,13(4):397-413
With the help of the apparatus of tensors with values in the Atiyah-Kähler algebra (the apparatus of lambda tensors), a new representation for the relativistic equation of field theory is proposed. The circle of questions under consideration is standard for investigations concerning the theory of the Dirac equation (in this paper, we treat no problems dealing with second quantization). 相似文献
2.
3.
Proceedings of the Steklov Institute of Mathematics - 相似文献
4.
A three-dimensional unsteady model of filmwise vapor condensation on a curved surface that takes into account the mass forces, the surface tension, and the friction on the surface of the condensate film is developed. This model generalizes the previous models of the filmwise vapor condensation. An evolution equation is derived for a condensate-layer thickness. Numerical algorithms are developed for solving the evolution equation. The condensation of ethanol vapor moving in a round tube is calculated. The effect of the tube diameter on the intensity of condensation is analyzed. 相似文献
5.
Alexey Marchuk Prof. Dr. Wolfgang Schnick 《Angewandte Chemie (International ed. in English)》2015,54(8):2383-2387
Illumination sources based on phosphor‐converted light emitting diode (pcLED) technology are nowadays of great relevance. In particular, illumination‐grade pcLEDs are attracting increasing attention. Regarding this, the application of a single warm‐white‐emitting phosphor could be of great advantage. Herein, we report the synthesis of a novel nitridophosphate zeolite Ba3P5N10Br:Eu2+. Upon excitation by near‐UV light, natural‐white‐light luminescence was detected. The synthesis of Ba3P5N10Br:Eu2+ was carried out using the multianvil technique. The crystal structure of Ba3P5N10Br:Eu2+ was solved and refined by single‐crystal X‐ray diffraction analysis and confirmed by Rietveld refinement and FTIR spectroscopy. Furthermore, spectroscopic luminescence measurements were performed. Through the synthesis of Ba3P5N10Br:Eu2+, we have shown the great potential of nitridophosphate zeolites to serve as high‐performance luminescence materials. 相似文献
6.
Alexey Marchuk Florian J. Pucher Friedrich W. Karau Prof. Dr. Wolfgang Schnick 《Angewandte Chemie (International ed. in English)》2014,53(9):2469-2472
Phosphorus nitride imide, PN(NH), is of great scientific importance because it is isosteric with silica (SiO2). Accordingly, a varied structural diversity could be expected. However, only one polymorph of PN(NH) has been reported thus far. Herein, we report on the synthesis and structural investigation of the first high‐pressure polymorph of phosphorus nitride imide, β‐PN(NH); the compound has been synthesized using the multianvil technique. By adding catalytic amounts of NH4Cl as a mineralizer, it became possible to grow single crystals of β‐PN(NH), which allowed the first complete structural elucidation of a highly condensed phosphorus nitride from single‐crystal X‐ray diffraction data. The structure was confirmed by FTIR and 31P and 1H solid‐state NMR spectroscopy. We are confident that high‐pressure/high‐temperature reactions could lead to new polymorphs of PN(NH) containing five‐fold‐ or even six‐fold‐coordinated phosphorus atoms and thus rivalling or even surpassing the structural variety of SiO2. 相似文献
7.
Heat transfer in a sessile liquid droplet was studied with numerical methods. A computer code was developed for solving the problem of convection in an axisymmetric hemispherical droplet and in a spherical layer as well. The problem of establishing an equilibrium state in a droplet was solved using several variables: temperature, stream function, and vorticity. Simulation was performed for droplets of water, ethyl alcohol, and model liquids. Variable parameters: intensity of heat transfer from droplet surface, Rayleigh and Marangoni dimensionless criteria, and the characteristic temperature difference. It was revealed that the curve of convective flow intensity versus heat transfer intensity at droplet surface has a maximum. A dual-vortex structure was obtained in a stationary hemispherical profile of liquid droplet for the case of close values for thermocapillary and thermogravitational forces. Either thermocapillary or thermogravitational vortex might be dominating phenomena in the flow structure. 相似文献
8.
Prof. Dr. Heinz Langhals Dr. Bernd Böck M. Sc. Tanja Schmid Alexey Marchuk 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(41):13188-13194
Benzoperylene derivatives with two angularly attached dicarboxylic imide rings, which were prepared by the Diels–Alder‐Reaction, exhibit strong fluorescence and their free peri positions allow either control of the UV/Vis spectra through their substituents or form anchor positions for the attachment of functional units. The angular chromophore 3 may be used both for fluorescent labeling such as for primary amines or enzymes or as building blocks for more complex assemblies where they may act as energy donors for FRET or electron acceptors in PET such as for photovoltaic solar cells. 相似文献
9.
L. A. Shcherbachenko V. S. Borisov N. T. Maksimova E. S. Baryshnikov Ya. V. Ezhova V. A. Karnakov S. D. Marchuk Yu. T. Eine 《Technical Physics》2010,55(8):1209-1215
The nature and mechanism of interfacial electrical interaction in organic colloids containing an active solid phase and a
polar liquid phase are studied. Such systems are shown to offer specific properties. Specifically, high electrical forces
producing gradients of the potential of the self-electric internal field arise at the liquid-solid interface. In the presence
of free charges and ionic conductivity channels, this field can induce currents in such systems. When investigating the colloid
system of the human venous blood, it is found that the internal field causes mesoscopic inhomogeneity in the structure of
the aqueous components of the plasma and cytoplasm. It is shown that the concentration of free water molecules in the liquid
phase of the system is maximal in group I blood and the physically nonuniform properties of combined water show up to the
greatest extent in group IV blood. This finding is corroborated by the dispersion of the dielectric polarization in blood
of different groups. 相似文献
10.
Summary.
We consider the application of linear multistep methods (LMMs)
for the numerical solution of initial value problem for stiff delay
differential equations (DDEs) with several constant delays, which are
used in mathematical modelling of immune response. For the approximation
of delayed variables the Nordsieck's interpolation technique, providing
an interpolation procedure consistent with the underlying linear
multistep formula, is used. An analysis of the convergence for a
variable-stepsize and structure of the asymptotic expansion of global
error for a fixed-stepsize is presented. Some absolute stability
characteristics of the method are examined. Implementation details of
the code DIFSUB-DDE, being a modification of the Gear's DIFSUB, are
given. Finally, an efficiency of the code developed for solution of
stiff DDEs over a wide range of tolerances is illustrated on biomedical
application model.
Received
March 23, 1994 / Revised version received March 13,
1995 相似文献