全文获取类型
收费全文 | 7680篇 |
免费 | 202篇 |
国内免费 | 24篇 |
专业分类
化学 | 5790篇 |
晶体学 | 45篇 |
力学 | 70篇 |
数学 | 1115篇 |
物理学 | 886篇 |
出版年
2020年 | 78篇 |
2019年 | 73篇 |
2016年 | 147篇 |
2015年 | 146篇 |
2014年 | 114篇 |
2013年 | 259篇 |
2012年 | 244篇 |
2011年 | 325篇 |
2010年 | 183篇 |
2009年 | 192篇 |
2008年 | 294篇 |
2007年 | 301篇 |
2006年 | 275篇 |
2005年 | 309篇 |
2004年 | 285篇 |
2003年 | 232篇 |
2002年 | 199篇 |
2001年 | 112篇 |
2000年 | 103篇 |
1999年 | 110篇 |
1998年 | 109篇 |
1997年 | 130篇 |
1996年 | 130篇 |
1995年 | 124篇 |
1994年 | 113篇 |
1993年 | 123篇 |
1992年 | 110篇 |
1991年 | 108篇 |
1990年 | 86篇 |
1989年 | 109篇 |
1988年 | 119篇 |
1987年 | 105篇 |
1986年 | 113篇 |
1985年 | 138篇 |
1984年 | 107篇 |
1983年 | 110篇 |
1982年 | 114篇 |
1981年 | 100篇 |
1980年 | 107篇 |
1979年 | 96篇 |
1978年 | 88篇 |
1977年 | 85篇 |
1976年 | 82篇 |
1974年 | 95篇 |
1973年 | 86篇 |
1971年 | 75篇 |
1961年 | 141篇 |
1960年 | 195篇 |
1959年 | 104篇 |
1958年 | 116篇 |
排序方式: 共有7906条查询结果,搜索用时 0 毫秒
31.
Klaus Ziegler 《Journal of multivariate analysis》1997,62(2):233-272
Functional central limit theorems for triangular arrays of rowwise independent stochastic processes are established by a method replacing tail probabilities by expectations throughout. The main tool is a maximal inequality based on a preliminary version proved by P. Gaenssler and Th. Schlumprecht. Its essential refinement used here is achieved by an additional inequality due to M. Ledoux and M. Talagrand. The entropy condition emerging in our theorems was introduced by K. S. Alexander, whose functional central limit theorem for so-calledmeasure-like processeswill be also regained. Applications concern, in particular, so-calledrandom measure processeswhich include function-indexed empirical processes and partial-sum processes (with random or fixed locations). In this context, we obtain generalizations of results due to K. S. Alexander, M. A. Arcones, P. Gaenssler, and K. Ziegler. Further examples include nonparametric regression and intensity estimation for spatial Poisson processes. 相似文献
32.
33.
34.
35.
36.
37.
Klaus Weisskopf 《Journal of polymer science. Part A, Polymer chemistry》1988,26(7):1919-1935
The use of the solvent mixture chloroform/hexafluoroisopropanol (98 : 2 vol %) in the GPC-analysis of polyethylene terephthalate (PET) is described. PET-samples of different molecular weight have been prepared and characterized by light scattering, viscometry, and improved techniques of osmometry and end group titration. These well characterized samples were used in calibrating the GPC. The calibration with polydisperse standards was found superior to the universal calibration procedure in the solvent system chosen. 相似文献
38.
Klaus G. Heumann 《Trends in analytical chemistry : TRAC》1982,1(15):357-361
Isotope dilution mass spectrometry is an important method for accurate and precise determination of trace- and micro-amounts of the elements. Using different ionization techniques in the mass spectrometer most of the elements of the periodic table can be analysed. 相似文献
39.
Nelson Durán Klaus Zinner Roberto Casadei de Baptista Carmen C. C. Vidigal Giuseppe Cilento 《Photochemistry and photobiology》1976,24(4):383-388
Abstract— The thiophenyl ester of indole-3-acetic acid and indole-3-acetonitrile produce chemiluminescence in aerated dimethylsulfoxide in the presence of potassium t -butoxide. The emitter is the aromatic aldehyde. In the case of acetonitrile, the other product expected from the cleavage of an intermediate dioxetane, cyanate/isocyanate, has also been identified. Other auxins also chemiluminesce under similar conditions, but the emitters have not been properly identified.
These systems are models for the peroxidase catalyzed oxidation of indole-3-acetic acid to indole-3-carboxaldehyde and as such support the earlier inference (Vidigal et al , 1975) that the excited aldehyde is generated in the enzymic process.
An additional result is the observation of an exciplex between excited indole-3-carboxaldehyde and the thiophenylester of indole-3-acetic acid. This appears to be the first case of chemical generation of an exciplex by a route other than radical ion reaction, presumably by the dioxetane route. 相似文献
These systems are models for the peroxidase catalyzed oxidation of indole-3-acetic acid to indole-3-carboxaldehyde and as such support the earlier inference (Vidigal et al , 1975) that the excited aldehyde is generated in the enzymic process.
An additional result is the observation of an exciplex between excited indole-3-carboxaldehyde and the thiophenylester of indole-3-acetic acid. This appears to be the first case of chemical generation of an exciplex by a route other than radical ion reaction, presumably by the dioxetane route. 相似文献
40.