全文获取类型
收费全文 | 75篇 |
免费 | 3篇 |
专业分类
化学 | 28篇 |
数学 | 33篇 |
物理学 | 17篇 |
出版年
2018年 | 1篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2008年 | 3篇 |
2007年 | 7篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 6篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 3篇 |
1973年 | 5篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1967年 | 2篇 |
1966年 | 3篇 |
1965年 | 2篇 |
1963年 | 2篇 |
1962年 | 2篇 |
1961年 | 5篇 |
1954年 | 1篇 |
排序方式: 共有78条查询结果,搜索用时 109 毫秒
1.
Dullens RP Claesson EM Kegel WK 《Langmuir : the ACS journal of surfaces and colloids》2004,20(3):658-664
We report a single step preparation of monodisperse fluorescent poly(methyl)methacrylate (PMMA) lattices cross-linked with ethylene glycol dimethacrylate with radii in the range 150-1000 nm using dispersion polymerization. The particles are applied as fluorescent cores in core-shell PMMA particles for confocal microscopy (Dullens et al. Langmuir 2003, 19, 5963). Contrary to un-cross-linked particles, these cross-linked colloids are stable in good solvents for PMMA as well. Therefore we studied the properties of the cross-linked PMMA particles in the good solvents tetrahydrofuran (THF), chloroform, and toluene using light scattering and confocal scanning laser microscopy. We show that the particles swell instantaneously and that their volume can increase up to more than seven times their volume in poor solvents. Further, it is very likely that the particles are charged in THF. 相似文献
2.
Summary For a classC of structures there are two archetypical questions: 1) Is every group G the full automorphism group of some C C? and 2) May every C C embedded into some homogeneous H C, i.e. into a structure H enjoying some transitivity properties? Using model theoretic language and conditions on the existence of certain free constructions withinC, some rather general positive answers to these questions are obtained. These abstract results give some (methodical) unification to a variety of theorems for some very concrete classesC of combinatorial, geometrical or algebraic nature in the literature. To underline this point, the major part of the paper is devoted to a systematic survey of classesC of structures in which our general approach is applicable, included many classesC for which our type of questions has not yet been considered.
Unserem lieben FreundeAdriano Barlotti zum 60. Geburtstag gewidmet.
Die Autoren danken herzlich der Deutschen Forschungsgemeinschaft für die gewährte Unterstützung; der erstgenannte Autor bedankt sich darüber hinaus beim Consiglio Nazionale delle Ricerche für ein Stipendium an der Universität Bologna. 相似文献
Unserem lieben FreundeAdriano Barlotti zum 60. Geburtstag gewidmet.
Die Autoren danken herzlich der Deutschen Forschungsgemeinschaft für die gewährte Unterstützung; der erstgenannte Autor bedankt sich darüber hinaus beim Consiglio Nazionale delle Ricerche für ein Stipendium an der Universität Bologna. 相似文献
3.
Dr. J. Kegel 《Analytical and bioanalytical chemistry》1972,276(1):45-50
The direct determination of CO2 is often faulty because of certain contents of the natural water. Due to this reason a specific method was worked out. The water to be analysed and distilled water are placed side by side in a gas-tight vessel with an atmosphere free of CO2, whereby mixing is avoided but gas-exchange is possible. After adjustment to the gas-equilibration the CO2 content of the distilled water is determined e.g. by titration, measuring of conductivity or other methods, from where the CO2 content in the natural water is calculated. 相似文献
4.
5.
6.
Validzic IL van Hooijdonk G Oosterhout S Kegel WK 《Langmuir : the ACS journal of surfaces and colloids》2004,20(8):3435-3440
We show that a single geometrical rule underlies the stability of "polyoxomolybdates", the variety of clusters of molybdenum(VI) oxide in (acidified) aqueous solution that are found experimentally. We predict that upon increasing the proton or total molybdenum oxide concentration, the average size of the clusters increases. We compare our predictions with results from ultracentrifugation experiments and with data in the literature. Finally, it is shown that the formation of metal oxide clusters is thermodynamically equivalent to the formation of surfactant micelles. 相似文献
7.
Kegel I Metzger TH Lorke A Peisl J Stangl J Bauer G Garcia JM Petroff PM 《Physical review letters》2000,85(8):1694-1697
Tomographic nanometer-scale images of self-assembled InAs/GaAs quantum dots have been obtained from surface-sensitive x-ray diffraction. Based on the three-dimensional intensity mapping of selected regions in reciprocal space, the method yields the shape of the dots along with the lattice parameter distribution and the vertical interdiffusion profile on a subnanometer scale. The material composition is found to vary continuously from GaAs at the base of the dot to InAs at the top. 相似文献
8.
Otto H. Kegel 《Archiv der Mathematik》1961,12(1):409-412
Ohne Zusammenfassung 相似文献
9.
Otto H. Kegel 《Mathematische Zeitschrift》1965,87(1):42-48
Ohne ZusammenfassungFrau Professor Dr.Ruth Moufang zum 10. Januar 1965 gewidmetResearch done at the University of Chicago, supported in part by the National Science Foundation. 相似文献
10.