全文获取类型
收费全文 | 304篇 |
免费 | 11篇 |
国内免费 | 1篇 |
专业分类
化学 | 210篇 |
晶体学 | 3篇 |
力学 | 6篇 |
数学 | 26篇 |
物理学 | 71篇 |
出版年
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 6篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 17篇 |
2012年 | 15篇 |
2011年 | 16篇 |
2010年 | 10篇 |
2009年 | 9篇 |
2008年 | 16篇 |
2007年 | 17篇 |
2006年 | 6篇 |
2005年 | 12篇 |
2004年 | 9篇 |
2003年 | 8篇 |
2002年 | 20篇 |
2001年 | 4篇 |
2000年 | 11篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 9篇 |
1994年 | 3篇 |
1993年 | 6篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 8篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1968年 | 2篇 |
1965年 | 2篇 |
1962年 | 2篇 |
1939年 | 4篇 |
排序方式: 共有316条查询结果,搜索用时 15 毫秒
21.
22.
Summary The microanalysis of solutions of dioxouranium- (VI) has been investigated employing differential pulse polarography. These studies show that uranium and lead can be determined accurately and economically in the presence of each other. The lead current peak occurs at –0.325 V, the uranium peak at – 0.200 V. Quantitative determinations are possible in the presence of Bi, Zn, Co and Fe.
Polarographische Bestimmung von Uran und Blei nebeneinander相似文献
23.
24.
25.
T. C. Daniels B. Emery und Dorothy Prather 《Fresenius' Journal of Analytical Chemistry》1939,118(1-2):52
Ohne Zusammenfassung 相似文献
26.
The paper presents a computational model for elastic waves in a structured weld adjacent to the free surface of an elastic solid. The main emphasis is on the interaction of waves with the micro-structure of the weld. Effects of localisation and channeling of waves are addressed. A model of a grain structure within the weld is also considered. 相似文献
27.
28.
J. A. Muller C. Reinhardt C. Fischbach A. Siebenschub V. Stanek N. M. Randall K. Bogoluboff H. Wdowiszewski F. Garrat D. J. Demorest J. R. Cain H. E. Walters F. C. T. Daniels A. J. Field A. Terni P. Malaguti B. S. Evans L. W. Winkler O. L. Barnebey G. L. Kelley J. A. Wiley E. Little J. Costa M. Gröger H. O. Ward P. Slawik W. Hild und F. Simion 《Fresenius' Journal of Analytical Chemistry》1923,63(9):348-359
Ohne Zusammenfassung 相似文献
29.
Snezana Savic Gordana Vuleta Rolf Daniels Christel C. Müller-Goymann 《Colloid and polymer science》2005,283(4):439-451
The aim of this study was to examine the lyotropic potential of an alkylpolyglucoside mixed emulsifier (Cetearyl glucoside&Cetearyl alcohol), which belongs to the new generation of natural (sugar) surfactants, and to elaborate the potential stabilization mechanism and relation between the colloid microstructure and water distribution within the systems. Polarization and ordinary light as well as transmission electron microscopy, wide and small-angle X-ray diffraction, thermal analysis and rheological measurement were employed for the systems characterization.It was suggested that Cetearyl glucoside&Cetearyl alcohol stabilizes the o/w creams by synergistic effects of viscoelastic hydrophilic gel of lamellar type and lipophilic gel network built up from cetostearyl alcohol semi-hydrates as well as by lamellar liquid crystalline bilayers surrounding the oil droplets. The hydrophilic gel consists of mixed cetearyl glucoside/cetearyl alcohol crystalline bilayers entrapping the water interlamellarly by hydrogen bonding. It is also showed that oil addition into the chosen binary system influences the creams microstructure significantly, which particularly reflects onto the mode of water distribution within the creams and consequently their potential of skin hydration. 相似文献
30.
Polymer encapsulation of yttrium oxysulfide phosphorescent particles via miniemulsion polymerization
Hyungsoo Kim Eric S. Daniels Shang Li Vijaya K. Mokkapati Keith Kardos 《Journal of polymer science. Part A, Polymer chemistry》2007,45(6):1038-1054
Yttrium oxysulfide upconverting phosphor particles can absorb infrared light and emit dopant‐dependent visible phosphorescence. This unique optical property has been used for particle‐based immunoassay applications. In this study, upconverting phosphor particles were encapsulated with a functionalized polymer (carboxylated polystyrene) shell layer via several approaches, which included the following: (1) the physical adsorption of the carboxylated polystyrene polymer onto the phosphor surfaces, (2) the miniemulsification of the preformed carboxylated polystyrene in a solvent in the presence of the phosphor particles and the subsequent stripping off of the solvent, and (3) the miniemulsification and miniemulsion copolymerization of styrene and methacrylic acid in the presence of the phosphor particles with hexadecane as a costabilizer in combination with a surfactant (sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, or sodium dihexyl sulfosuccinate). Miniemulsion technology proved to be the most effective method for forming a functionalized polymeric nanoshell surrounding the phosphor particles. The morphology of the encapsulated phosphor particles was found to vary from symmetric core–shell (i.e., a uniform nanoshell layer with varying shell thicknesses), asymmetric core–shell, dumbbell‐like, or raspberry‐like partial encapsulation to multiparticle encapsulation. The amount of multiparticle encapsulation could be reduced by the postaddition of a surfactant, but it could not be eliminated completely. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1038–1054, 2007 相似文献