全文获取类型
收费全文 | 324篇 |
免费 | 12篇 |
专业分类
化学 | 184篇 |
晶体学 | 3篇 |
力学 | 4篇 |
数学 | 42篇 |
物理学 | 103篇 |
出版年
2023年 | 12篇 |
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 6篇 |
2019年 | 9篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 14篇 |
2014年 | 17篇 |
2013年 | 23篇 |
2012年 | 37篇 |
2011年 | 27篇 |
2010年 | 12篇 |
2009年 | 15篇 |
2008年 | 20篇 |
2007年 | 20篇 |
2006年 | 8篇 |
2005年 | 18篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1995年 | 1篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1988年 | 3篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1965年 | 1篇 |
1939年 | 2篇 |
1938年 | 1篇 |
排序方式: 共有336条查询结果,搜索用时 15 毫秒
31.
The purpose of this paper is to present an exact formulation of stochastic EMQ model for an unreliable production system under a general framework in which the time to machine failure, corrective (emergency) and preventive (regular) repair times are assumed to be random variables. For exact financial implications of the lot-sizing decisions, the EMQ model is formulated based on the net present value (NPV) approach. Then, by taking limitation on the discount rate, the traditional long-run average cost model is obtained. The criteria for the existence and uniqueness of the optimal production time in both the models are derived under general failure and specific repair time distributions. Numerical examples are devoted to find the optimal production policies of the developed models and examine the sensitivity of the parameters involved. Computational results show that the optimal decision based on the NPV approach is superior to that based on the long-run average cost approach, though the performance level strongly depends on the pertinent failure and repair time distributions. 相似文献
32.
Basel F. Abu-Sharkh Adam M. Giri Ibnelwaleed A. Hussein 《European Polymer Journal》2004,40(6):1177-1182
Microstructure of linear low-density polyethylene (LLDPE) with linear high-density polyethylene (HDPE) is investigated by molecular dynamics (MD) simulation. The branch content of LLDPE was varied from 10 to 60 branches/1000 C. An equimolar mixture of each of the two polymers is simulated in the NVT ensemble at 500 K and at average experimental densities of the two polymer melts. Initially, chains of LLDPE and HDPE were completely mixed and evolution of conformations with time was monitored. The blends were found to microphase separate when the branch content of LLDPE exceeded 30 branches/1000 C. At 40 branches/1000 C, the two polymers displayed partial microphase separation and complete microphase separation was observed at 60 branches/1000 C. Substantial short-range order and mismatch of molecular conformations is observed in the microphase-separated systems. 相似文献
33.
Pulak Ranjan Giri 《International Journal of Theoretical Physics》2008,47(6):1776-1783
The existence of bound state of the polarizable neutral atom in the inverse square potential created by the electric field
of a single walled charged carbon nanotube (SWNT) is shown to be theoretically possible. The consideration of inequivalent
boundary conditions due to self-adjoint extensions lead to this nontrivial bound state solution. It is also shown that the
scaling anomaly is responsible for the existence of such bound state. Binding of the polarizable atoms in the coupling constant
interval η
2∈[0,1) may be responsible for the smearing of the edge of steps in quantized conductance, which has not been considered so
far in the literature. 相似文献
34.
A technique recently developed for inelastic electron proton scattering is applied for inelastic electron pion scattering.
It is found that all the derivatives of off-shell form factor of pion nears=m
π
2 and for largeQ
2 are bounded from above, provided that the dispersion relation for the form factor requires no more than one subtraction.
The elastic pion form factor is bounded by [lnQ
2]
c
/Q
2, wherec is any positive constant. 相似文献
35.
Giri Kumar Tayi Jagdish Gangolly 《The Journal of the Operational Research Society》1985,36(10):951-957
The choice of an audit sample involves integration of diverse goals. Such integration must consider the preferences of the auditor towards costs as well as risks. Traditionally this problem has been formulated to determine minimal sample size and its allocation such that each of the goals is satisfied simultaneously or to the extent possible. However, these formulations do not consider trade-offs between goals, so that the sample may not reflect the auditor's preferences regarding sampling costs and risks. In this paper, we model such trade-offs by utilizing a polynomial goal-programming framework and utilize a practical case problem to illustrate the framework. Computational experience shows the technique to be feasible and inexpensive. 相似文献
36.
The weak radiative decay Λ
b
→Λγ is studied in the heavy quark effective theory treatings-quark as heavy. This rare decay is induced by the short distance electromagnetic penguins. Including corrections of the order
of (1/m
Q), we obtain the transition matrix element and the corresponding decay width. The Isgur-Wise function is evaluated in the
largeN
c limit and the branching ratio obtained is 1.48×10−5. 相似文献
37.
A. Köster B. Miczyska K. Miczyski A. Listowski J. Voss P. N. Bhargava K. V. Giri J. G. A. Griffiths K. Schmorl N. W. Romenski H. C. Eckstein H. S. Grindley T. S. Hamilton W. B. Nevens G. L. Clark J. L. Gring und Th. v. Fellenberg 《Fresenius' Journal of Analytical Chemistry》1938,113(3-4):140-144
Ohne Zusammenfassung 相似文献
38.
39.
40.
The ground-state properties of the monomer and the dimer of formic acid, acetic acid, and benzoic acid have been investigated using Hartree-Fock (HF) and density functional theory (DFT) methods using the 6-311++G(d,p) basis set. Some of the low-lying excited states have been studied using the time-dependent density functional theory (TDDFT) with LDA and B3LYP functionals and also employing complete-active-space-self-consistent-field (CASSCF) and multireference configuration interaction (MRCI) methodologies. DFT calculations predict the ground-state geometries in quantitative agreement with the available experimental results. The computed binding energies for the three carboxylic acid dimers are also in accord with the known thermodynamic data. The TDDFT predicted wavelengths corresponding to the lowest energy n-pi* transition in formic acid (214 nm) and acetic acid (214 nm) and the pi-pi* transition in benzoic acid (255 nm) are comparable to the experimentally observed absorption maxima. In addition, TDDFT calculations predict qualitatively correctly the blue shift (4-5 nm) in the excitation energy for the pi-pi* transition in going from the monomer to the dimer of formic acid and acetic acid and the red shift (approximately 19 nm) in pi-pi* transition in going from benzoic acid monomer to dimer. This also indicates that the electronic interaction arising from the hydrogen bonds between the monomers is marginal in all three carboxylic acids investigated. 相似文献