全文获取类型
收费全文 | 253篇 |
免费 | 7篇 |
国内免费 | 2篇 |
学科分类
数理化 | 262篇 |
出版年
2022年 | 4篇 |
2021年 | 8篇 |
2020年 | 8篇 |
2019年 | 8篇 |
2018年 | 5篇 |
2017年 | 6篇 |
2016年 | 8篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 27篇 |
2012年 | 21篇 |
2011年 | 28篇 |
2010年 | 12篇 |
2009年 | 19篇 |
2008年 | 17篇 |
2007年 | 17篇 |
2006年 | 10篇 |
2005年 | 10篇 |
2004年 | 8篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 7篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有262条查询结果,搜索用时 34 毫秒
91.
M. Zafer Köylü Nadir Demirel F. Doganel Polat Ali Yιlmaz Halil Hoşgören Metin Balci 《Journal of inclusion phenomena and macrocyclic chemistry》2005,52(1-2):51-54
The complexation of the crown ethers with Na+ ion was studied. 1H-NMR chemical shifts are discussed in terms of structural modification as well as also binding studies with UV–vis spectra
were included.
This revised version was published online in July 2005 with a corrected issue number.
An erratum to this article is available at . 相似文献
92.
93.
Acta Mathematica Hungarica - 相似文献
94.
95.
96.
Binding constants and thermodynamic parameters for 1:1 complexation of a porphyrin macroring, self-assembled from three trisporphyrinatozinc through imidazole-Zn coordination on the terminal porphyrins, with several multidentate pyridyl and fullerenyl ligands were examined. In benzonitrile, the ligand having one fullerenyl and two coordinative pyridyl moieties surprisingly afforded the highest affinity. The thermodynamic data of the complexation indicated that an unusual and fairly large positive entropic change, which may be attributed to extensive desolvation of the solutes especially from the large cavity of porphyrin macroring and fullerene surface, significantly contributed to the enhancement of the binding constant. 相似文献
97.
Novel mono phthalocyanines and cofacial bisphthalocyanines were synthesized from 4,4′-(1a,8b-dihydronaphtho[b]naphthofuro-[3,2-d]furan-7,10-diyl)bis(oxy)diphthalonitrile 1. The products were characterized by elemental analysis, UV-vis, IR, 1H NMR and mass spectroscopy. Both the direct current (dc) and alternating current (ac) electrical properties of the product films were investigated as a function of temperature in the frequency range 40-105 Hz. It was observed that the ac response of the films can be represented by the ωs law. The temperature dependence of dc conductivity showed typical Arrhenius behavior for all compounds. 相似文献
98.
Efe Baturhan Orman Mehmet Pişkin Zafer Odabaş Ali Rıza Özkaya 《Electroanalysis》2021,33(11):2310-2322
By using of peripherally tetrakis-2,6-dimethoxyphenoxy substituted Co(II), Fe(III), and Mn(III) phthalocyanines was observed to extend the redox richness of the phthalocyanine ring with the addition of reversible metal-based electron transfer couples to the phthalocyanine ring-based electron transfer processes in solution. The emergence of highly steady anionic and cationic redox species with clear spectral and colour changes both in solution and in the film during in situ spectroelectrochemical and in situ electrocolorimetric measurements pointed out their applicability as electrochromic materials. Furthermore, the phthalocyanine complexes demonstrated strong interaction with dioxygen and thus, high electrocatalytic enforcement for its reduction. 相似文献
99.
Hadi Naslhajian S. Morteza F. Farnia Ayda Sheykhi Onur Şahin Okan Zafer Yeşilel 《Journal of Coordination Chemistry》2017,70(17):2940-2949
A new decavanadate polyoxovanadate nanocluster, [2-ampH]6[V10O28]?2H2O (1), was synthesized through reaction between ammonium vanadate and 2-aminopyridine at pH = 2. Nanocluster 1 was characterized by IR, elemental analysis, and X-ray crystallography. 1 was found to adsorb and desorb dyes and may have widespread application in wastewater treatment. The utility of 1 for adsorption of methylene blue was studied. The adsorbed dyes can be easily desorbed, and 1 has full efficiency after five cycles. 相似文献
100.
Zafer Ugur 《Analytical letters》2017,50(3):567-579
The formation of protein carbonyls in the metal-catalyzed oxidation of human serum albumin (HSA) is characterized using a new analytical approach that involves tagging the modification site with multiple hydrazide reagents. Protein carbonyl formation at lysine and arginine residues was catalyzed with copper and iron ions, and the resulting oxidation patterns in HSA are contrasted. A total of 18 modification sites were identified with iron-ion catalysis and 14 with copper-ion catalysis. However, with the more stringent requirement of identification with at least two tagging reagents, the number of validated modification sites drops to 10 for iron and nine for copper. Of the 14 total validated sites, there were only five in common for the two metal ions. The results illustrate the value of using multiple tagging agents and highlight the selective and specific nature of metal-catalyzed protein oxidations. 相似文献