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11.
托马斯·哈代向以小说著称于世,但其在诗歌上的成就亦为斐然。其诗作言语简练,朴实无华然而往往含意隽永,充满对现实的冷眼相看,但又富于对生活和爱情的瑰丽幻想,是现实主义与浪漫主义的结合。他的诗歌《“啊,是你在我坟上挖掘么?”》就以对白式的设计和反复的吟咏以及出人意料的结尾向读者展现了世情淡漠,世态炎凉。 相似文献
12.
吴强 《同济大学学报(自然科学版)》2008,36(11)
在风险中性下,建立一类投资连结型保险的数学模型,利用基本解显式地给出帐户资产不带跳情形下的保单价格解析表达式;对于带跳情形,利用基本解的性质对带跳情形下的边界条件进行处理.同时运用算子分裂迭代的方法,得到帐户资产带跳情形下的保单的数值结果. 相似文献
13.
14.
Catherine Westfall 《Physics in Perspective (PIP)》2006,8(2):189-213
I explore the fifty-year development of M?ssbauer spectroscopy by focusing on three episodes in its development at Argonne
National Laboratory: work by nuclear physicists using radioactive sources in the early 1960s, work by solid-state physicists
using radioactive resources from the mid- 1960s through the 1970s,and work by solid-state physicists using the Advanced Photon
Source from the 1980s to 2005. These episodes show how knowledge about the properties of matter was produced in a national-laboratory
context and highlights the web of connections that allow nationallaboratory scientists working at a variety of scales to produce
both technological and scientific innovations. 相似文献
15.
蒋长锦 《数学物理学报(A辑)》2002,22(2):225-230
该文将Thomas Fermi近似问题分解为一个带奇点的常微分方程边值问题和一个最优化问题,讨论了解的存在唯一性和解的性质,给出了Thomas Fermi近似问题求解的具体步骤. 相似文献
16.
Abraham A. Ungar 《Foundations of Physics Letters》1988,1(1):57-89
Two successive pure Lorentz transformations are equivalent to a pure Lorentz transformation preceded by a 3×3 space rotation, called a Thomas rotation. When applied to the gyration of the rotation axis of a spinning mass, Thomas rotation gives rise to the well-knownThomas precession. A 3×3 parametric, unimodular, orthogonal matrix that represents the Thomas rotation is presented and studied. This matrix representation enables the Lorentz transformation group to be parametrized by two physical observables: the (3-dimensional) relative velocity and orientation between inertial frames. The resulting parametrization of the Lorentz group, in turn, enables the composition of successive Lorentz transformations to be given by parameter composition. This composition is continuously deformed into a corresponding, well-known Galilean transformation composition by letting the speed of light approach infinity. Finally, as an application the Lorentz transformation with given orientation parameter is uniquely expressed in terms of an initial and a final time-like 4-vector. 相似文献
17.
The leptodermous expansion of the total ground state energy of a nucleus into volume, surface, curvature and gauss curvature
contributions has been studied starting from a semi-classical energy density formalism of extended Thomas Fermi type. A numerical
procedure was used to obtain the surface energy and curvature energy contributions from surface moments of energy density
profilesH(r) for a sequence of nuclei withN=Z and neglecting the coulomb interaction for the three Skyrme forces. A transition to the liquid drop model type expansion
in increasing powers ofA
−1/3 is then made, taking into account the dependence of the central density and the surface structure on the mass of the nucleus.
It is found that there is no inconsistency between the curvature contribution to the total energy in the leptodermous expansion
and theA
−1/3 term contribution in the liquid drop model expansion. It has been shown that the earlier apparent anomaly between the above
two methods arises due to the use of semi-infinite approximation and the mass dependence of the central density and the surface
structure of finite nuclei. 相似文献
18.
S. W. Armfield 《国际流体数值方法杂志》1993,17(7):589-603
The advent of vector and massively parallel computers offers researchers the possibility of enormous gains in execution time for scientific and engineering programs. From the numerical point of view, such programs are frequently based on the inversion of sparse, diagonally banded matrices. Conventional scalar solvers often perform poorly on vector machines due to short effective vector lengths, and thus appropriate methods must be chosen for use with vector machines. In this paper a number of commonly used solvers are tested for the Navier–Stokes equations, in both scalar and vector form, on two vector architecture machines. A new method is presented which performs well in both vector and scalar form on a range of vector architectures. 相似文献
19.
20.
The expanded mixed covolume method for the two‐dimensional Sobolev equation with convection term is developed and studied. This method uses the lowest‐order Raviart‐Thomas mixed finite element space as the trial function space. By introducing a transfer operator γh which maps the trial function space into the test function space and combining expanded mixed finite element with mixed covolume method, the continuous‐in‐time, discrete‐in‐time expanded mixed covolume schemes are constructed, and optimal error estimates for these schemes are obtained. Numerical results are given to examine the validity and effectiveness of the proposed schemes.© 2012 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2013 相似文献