全文获取类型
收费全文 | 10544篇 |
免费 | 984篇 |
国内免费 | 696篇 |
专业分类
化学 | 4829篇 |
晶体学 | 194篇 |
力学 | 25篇 |
综合类 | 9篇 |
数学 | 13篇 |
物理学 | 7154篇 |
出版年
2024年 | 22篇 |
2023年 | 185篇 |
2022年 | 231篇 |
2021年 | 247篇 |
2020年 | 186篇 |
2019年 | 242篇 |
2018年 | 242篇 |
2017年 | 282篇 |
2016年 | 507篇 |
2015年 | 429篇 |
2014年 | 548篇 |
2013年 | 1189篇 |
2012年 | 725篇 |
2011年 | 844篇 |
2010年 | 607篇 |
2009年 | 764篇 |
2008年 | 580篇 |
2007年 | 696篇 |
2006年 | 480篇 |
2005年 | 462篇 |
2004年 | 351篇 |
2003年 | 313篇 |
2002年 | 284篇 |
2001年 | 246篇 |
2000年 | 227篇 |
1999年 | 208篇 |
1998年 | 121篇 |
1997年 | 120篇 |
1996年 | 142篇 |
1995年 | 114篇 |
1994年 | 87篇 |
1993年 | 94篇 |
1992年 | 107篇 |
1991年 | 52篇 |
1990年 | 38篇 |
1989年 | 30篇 |
1988年 | 46篇 |
1987年 | 25篇 |
1986年 | 13篇 |
1985年 | 22篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 12篇 |
1981年 | 10篇 |
1980年 | 14篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1976年 | 10篇 |
1975年 | 5篇 |
1973年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 23 毫秒
81.
A. E. Raevskaya A. L. Stroyuk S. Ya. Kuchmii Yu. M. Azhnyuk V. M. Dzhagan M. Ya. Valakh 《Theoretical and Experimental Chemistry》2006,42(3):162-168
The optical characteristics of CdSe nanoparticles, produced in aqueous solutions and polymer films in the reaction of cadmium
chloride and sodium selenosulfate, were studied. The main parameters that make it possible to vary the forbidden band width
were identified. The absorption, photoluminescence, Raman, and nonstationary decolorization spectra of CdSe nanoparticles
of various sizes were analyzed. It was demonstrated that under the conditions of pulsed irradiation the CdSe nanoparticles
are capable of accumulating excess electrons and inducing redox transformations in components of the solution (oxygen, methylviologen,
and sulfite ions).
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 3, pp. 150–155, May–June, 2006. 相似文献
82.
In this work, the effects of electrolytes used in roughening gold substrates by electrochemical methods on surface-enhanced Raman scattering (SERS) were first investigated. First, gold substrates were roughened by triangular-wave oxidation–reduction cycles (ORC) in aqueous solutions containing different kinds of 0.1 M electrolytes. Then Rhodamine 6G (R6G) was used as Raman probe to examine this effect of electrolytes used on the SERS observed. The result indicates that the highest intensity of SERS of R6G was obtained on the roughened Au substrate prepared in 0.1 M NaCl, which was less used in the literature. Meanwhile, it was also found that the rougher surface morphology observed, which is contributive to the higher SERS obtained, is corresponding to the smaller cathodic peak area shown in the cyclic voltammograms for roughening the Au substrate. 相似文献
83.
84.
85.
86.
87.
88.
89.
Frost R. L. Weier M. L. Erickson Kristy L. 《Journal of Thermal Analysis and Calorimetry》2004,76(3):1025-1033
Struvite (NH4MgPO4·6H2O) is a mineral often found in urinary tracts and kidneys. Thermal decomposition using slow low heating shows that the 'kidney'
stone can be decomposed at temperatures below 40°C. At this temperature both ammonia and water are evolved. If more rapid
heating is employed the decomposition occurs at around 80°C. The implication of this work rests with the use of low slow heat
for the decomposition of the kidney stones.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
90.
FT-IR and Raman spectroscopic study of hydrated rubidium (cesium) borates and alkali double borates 总被引:1,自引:0,他引:1
Zhu Lixia Yue Tao Wang Jiang Gao Shiyang 《Russian Journal of Inorganic Chemistry》2007,52(11):1786-1792
FT-IR and Raman spectra of five hydrated alkali borates and five hydrated alkali double borates have been recorded at room
temperature in the range 400 to 4000 cm−1, and analyzed. Fundamental vibrational modes have been identified and assignments tentatively made in comparison with the
work of Janda and Heller, and Li Jun.
The text was submitted by the authors in English. 相似文献