全文获取类型
收费全文 | 680篇 |
免费 | 10篇 |
国内免费 | 9篇 |
专业分类
化学 | 211篇 |
晶体学 | 2篇 |
力学 | 16篇 |
数学 | 298篇 |
物理学 | 172篇 |
出版年
2020年 | 7篇 |
2019年 | 8篇 |
2018年 | 12篇 |
2017年 | 10篇 |
2016年 | 15篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 34篇 |
2012年 | 26篇 |
2011年 | 27篇 |
2010年 | 14篇 |
2009年 | 13篇 |
2008年 | 24篇 |
2007年 | 32篇 |
2006年 | 38篇 |
2005年 | 36篇 |
2004年 | 24篇 |
2003年 | 21篇 |
2002年 | 21篇 |
2001年 | 8篇 |
2000年 | 13篇 |
1999年 | 10篇 |
1998年 | 7篇 |
1997年 | 8篇 |
1996年 | 15篇 |
1995年 | 11篇 |
1994年 | 15篇 |
1993年 | 14篇 |
1992年 | 20篇 |
1991年 | 10篇 |
1990年 | 12篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 16篇 |
1984年 | 17篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 9篇 |
1979年 | 14篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1975年 | 12篇 |
1974年 | 9篇 |
1973年 | 3篇 |
1971年 | 2篇 |
1967年 | 3篇 |
排序方式: 共有699条查询结果,搜索用时 78 毫秒
91.
Natalya Fridman Moshe Kapon Menahem Kaftory 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(1):o47-o49
5‐Methylsulfanyl‐1H‐tetrazole, C2H4N4S, crystallizes in dimorphic forms; the α‐form crystallizes at room temperature in the monoclinic crystal system, space group P21/m, and the β‐form crystallizes by sublimation at 423 K in the orthorhombic crystal system, space group Pbcm. In both forms, the molecules occupy crystallographic mirror planes and are connected to one another via N—H⋯N hydrogen bonds, the amino H atoms being disordered. The two forms differ from one another in their packing; there are polar layers in the α‐form and non‐polar layers in the β‐form. 相似文献
92.
Moshe Gitterman 《Journal of statistical physics》1996,83(5-6):1261-1262
93.
Moshe Marcus 《Archive for Rational Mechanics and Analysis》1993,124(1):67-98
Communicated by J. M. Ball 相似文献
94.
Moshe Katz 《Israel Journal of Mathematics》1971,9(1):53-72
Let ℬ(m) be the set of all then-square (0–1) matrices containingm ones andn
2−m zeros, 0<m<n
2. The problem of finding the maximum ofs(A
2) over this set, wheres(A
2) is the sum of the entries ofA
2,A ∈ ℬ (m) is considered. This problem is solved in the particular casesm=n
2 −k
2 andm=k
2,k
2>(n
2/2).
This paper forms part of a thesis in partial fulfillment of the requirements for the degree of Doctor of Science at the Technion-Israel
Institute of Technology. The author wishes to thank Professor B. Schwarz and Dr. D. London for their help in the preparation
of this paper. 相似文献
95.
Moshe Sniedovich 《Operations Research Letters》1985,4(1):19-21
This paper presents the essentials of a method designed to solve optimization problems whose objective functions are of the form g(x)+ ψ(u(x)), where ψ is differentiable and either concave or convex. It is shown that solutions to such problems can be obtained through the solutions of the Lagrangian problem whose objective function is of the form g(x)+ λu(x). 相似文献
96.
Moshe Kaspi 《The Journal of the Operational Research Society》1991,42(2):165-168
This paper deals with the problem of determining the economic operating policy for inventory items which are manufactured jointly but packaged individually. The proposed new approach is very simple and efficient. An extensive simulation study is presented so that the results of several heuristics (based on a wide range of data, measuring the number of optimal solutions, average error and maximum error) can be compared. 相似文献
97.
Moshe Jarden 《Mathematische Annalen》1975,213(2):109-127
98.
99.
Moshe Sniedovich 《Discrete Applied Mathematics》1984,9(3):301-305
A method is introduced for the solution of minimization problems possessing objective functions of the form g(x)+?(u(x)), where ? is differentiable and concave. It is shown that a solution to such problems can be obtained through the solution of the Lagrangian problem whose objective function has the form g(x)+λu(x). 相似文献
100.