全文获取类型
收费全文 | 124篇 |
免费 | 1篇 |
专业分类
化学 | 97篇 |
数学 | 14篇 |
物理学 | 14篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 3篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2003年 | 1篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1973年 | 5篇 |
1972年 | 1篇 |
1966年 | 1篇 |
1928年 | 2篇 |
1896年 | 1篇 |
排序方式: 共有125条查询结果,搜索用时 15 毫秒
81.
Pavel Coufal Karel tulík Henk A. Claessens Carel A. Cramers 《Journal of separation science》1994,17(5):325-334
The influence of a number of factors, such as the nature of the buffer, the presence of additives therein, the manufacturing conditions, and the pretreatment of the capillary, on the magnitude and repeatability of the electroosmotic flow (EOF) in silica capillary tubes has been investigated. It was established that the nature of the buffer plays the most significant role in respect of the stability and magnitude of EOF, whereas the conditions used for manufacture and pretreatment of the tubing are less important. The EOF obtained using buffers consisting of tris(hydroxymethyl)aminomethane and ethylenediamine was more repeatable than that obtained using pure phosphate buffers. Buffer additives such as sodium dodecylsulfate, 1-butanol, sodium salts of 1-pentanesulfonic acid and 1-heptanesulfonic acid, altered the magnitude of the EOF only, not its repeatability. 相似文献
82.
A determinantal formula, based on an appropriate extension of the definition of subresultants, is derived for the location of the number of zeros of a generalized polynomial in the upper half plane. 相似文献
83.
84.
G. Claessens 《Journal of Computational and Applied Mathematics》1975,1(3):141-152
In this paper a survey is given of several algorithms for the computation of the Padé table of a formal power series. Those algorithms are studied which are based on certain relationships between adjacent elements in the Padé table. A new proof for the algorithms of Baker, Longman and for Gragg's variant of the qd-algorithm is given. A variant of Watson's algorithm is derived. The techniques used in this survey give some new ideas concerning the structure of the Padé table and the different ways to compute the elements of the table. 相似文献
85.
86.
N Zijlstra C Blum IM Segers-Nolten MM Claessens V Subramaniam 《Angewandte Chemie (International ed. in English)》2012,51(35):8821-8824
Bleaching proteins: Single-molecule photobleaching approaches and sub-stoichiometric labeling with fluorophores give insight into the number of monomers that form a specific α-synuclein oligomer. The results show that this α-synuclein oligomer is present as a single, well-defined species consisting of 31 monomers. 相似文献
87.
88.
Mengerink Y Peters R van der Wal S Claessens HA Cramers CA 《Journal of chromatography. A》2002,949(1-2):337-349
Polyamide-6,6 is a polycondensation product from the two monomers adipic acid and 1,6-hexamethylenediamine. Depending on the reacted amount of these monomers, different ratios of amine and carboxylic acid endgroups can be formed. Besides linear chains, cyclic polyamides will also be formed. Using critical chromatography, polyamide-6,6 can be separated independently of molar mass. Retention is based solely on endgroup functionality. It is demonstrated that high-molecular-mass polyamide-6,6 (Mw approximately 20,000-30,000) can be separated using this approach. The separation was optimized by using different parameters, such as percentage modifier, temperature and pressure. The concentration of phosphoric acid was used for selective retention of the different endgroup functionalities. Using this property, a new method called critical gradient chromatography was performed where the mobile phase changes from a weak to a strong solvent with respect to the endgroup functionality, while retaining the critical conditions of the backbone unit. Quantification using UV detection is discussed. 相似文献
89.
Several basic techniques are described for computing Padé approximants which are not normal. These techniques are modifications of some known methods for the computation of normal Padé approximants. 相似文献
90.