全文获取类型
收费全文 | 1048篇 |
免费 | 13篇 |
国内免费 | 2篇 |
专业分类
化学 | 613篇 |
晶体学 | 3篇 |
力学 | 43篇 |
数学 | 118篇 |
物理学 | 286篇 |
出版年
2021年 | 7篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 28篇 |
2015年 | 16篇 |
2014年 | 13篇 |
2013年 | 37篇 |
2012年 | 45篇 |
2011年 | 68篇 |
2010年 | 36篇 |
2009年 | 27篇 |
2008年 | 47篇 |
2007年 | 63篇 |
2006年 | 54篇 |
2005年 | 49篇 |
2004年 | 55篇 |
2003年 | 34篇 |
2002年 | 42篇 |
2001年 | 24篇 |
2000年 | 16篇 |
1999年 | 16篇 |
1998年 | 25篇 |
1997年 | 20篇 |
1996年 | 22篇 |
1995年 | 12篇 |
1994年 | 20篇 |
1993年 | 28篇 |
1992年 | 29篇 |
1991年 | 14篇 |
1990年 | 6篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 15篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1974年 | 7篇 |
1973年 | 6篇 |
1971年 | 4篇 |
排序方式: 共有1063条查询结果,搜索用时 0 毫秒
91.
The paper introduces the framework, problems addressed, objective function, types of variables and so on for a model designed to facilitate the economic evaluation of master city plans. The model presented here has been used in a pilot study of the city of Västerås, Sweden. It consists of three main parts, data, results and method. Some conclusions are drawn. 相似文献
92.
We study interest rate models where the term structure is given by an affine relation and in particular where the driving stochastic processes are so-called generalized Ornstein–Uhlenbeck processes. 相似文献
93.
In this paper, the development of decision support tools for dynamic ambulance relocation and automatic ambulance dispatching is described. The ambulance dispatch problem is to choose which ambulance to send to a patient. The dynamic ambulance relocation problem occurs in the operational control of ambulances. The objective is to find new locations for some of the ambulances, to increase the preparedness in the area of responsibility. Preparedness is a way of evaluating the ability to serve potential patients with ambulances now and in the future. Computational tests using a simulation model show that the tools are beneficial in reducing the waiting periods for the patients. 相似文献
94.
We define a smooth functional calculus for a non-commuting tuple of (unbounded) operators Aj on a Banach space with real spectra and resolvents with temperate growth, by means of an iterated Cauchy formula. The construction is also extended to tuples of more general operators allowing smooth functional calculii. We also discuss the relation to the case with commuting operators. 相似文献
95.
96.
97.
Lars Andersson Mattias Dahl Ralph Howard 《Transactions of the American Mathematical Society》1996,348(6):2307-2329
Let be a Lorentzian metric on the plane that agrees with the standard metric outside a compact set and so that there are no conjugate points along any time-like geodesic of . Then and are isometric. Further, if and are two dimensional compact time oriented Lorentzian manifolds with space--like boundaries and so that all time-like geodesics of maximize the distances between their points and and are ``boundary isometric', then there is a conformal diffeomorphism between and and they have the same areas. Similar results hold in higher dimensions under an extra assumption on the volumes of the manifolds.
98.
B. Andersson G. Gustafson H. Kharraziha J. Samuelsson 《Zeitschrift fur Physik C Particles and Fields》1996,71(1):613-624
We have in an earlier paper, [1], presented a generalization, the Linked Dipole Chain Model LDC, of the model developed by Ciafaloni-Catani-Fiorani-Marchesini, [2], to decribe the structure functions and the states in Deep Inelastic Scattering events. In this paper we would like to present an investigation of a set of general features of the LDC Model, viz the behaviour of the structure functions (we will show how the result interpolates in a precise way in between the well-known DGLAP and BFKL approaches), the average bremsstrahlung emission in the states and finally a partitioning of the structure functions into three different channels: the “ordinary” parton-probe events, where all bremsstrahlung emissions are below the probeQ 2, the boson-gluon fusion events where the last splitting of the parton chains contain transverse momentum aboveQ 2, and the resolved Rutherford scattering events between the probe and the hadron (where the largest transverse momentum occur somewhere along the emission lines away from the ends). 相似文献
99.
The first enantioselective reduction of aromatic 2H-azirines yields aziridines in up to 70% ee, using the aminoalcohol-[RuCl2(p-cymene)]2 catalyzed asymmetric transfer hydrogenation reaction. 相似文献
100.