全文获取类型
收费全文 | 132篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
化学 | 81篇 |
晶体学 | 4篇 |
数学 | 9篇 |
物理学 | 44篇 |
出版年
2023年 | 1篇 |
2021年 | 6篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 1篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 15篇 |
2009年 | 3篇 |
2008年 | 7篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 7篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 8篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1987年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1974年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有138条查询结果,搜索用时 93 毫秒
1.
2.
3.
This work presents our data concerning the synthesis and characterization of some Cr(III), Fe(III) and Zr(IV) complexes with
substituted (2-hydroxy-4-methoxy-phenyl)-phenyl-methanone - C14H12O3, denoted by (L1). The synthesis of these complex compounds was performed using melted urea as reaction medium. The obtained
complexes have been studied by chemical analysis, IR spectroscopy, X-ray diffraction and thermogravimetric analysis. Based
on the data resulting from the thermal behaviour of the studied complex compounds, the kinetic parameters of the thermal decomposition
reactions have been determined.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
3-(N",N",S-trialkylisothioureido)quinazolin-4(3H)-ones obtained by the reactions of 3-(N",N"-dialkylthioureido)quinazolin-4(3H)-ones with alkyl halides undergo unusual recyclization into 5-(2-aminophenyl)-2-dialkylamino-1,3,4-oxadiazoles under the action of aqueous solutions of alkali, hydrazine, and primary aliphatic amines. A plausible mechanism of the recyclization was proposed. 相似文献
5.
I. Caplanus M. Marcu M. Cazacu Mihaela Vasiloschi G. I. Rusu 《Journal of Macromolecular Science: Physics》2013,52(5):727-737
The temperature dependence of the electrical conductivity and the Seebeck coefficient of some new complex polymeric structures containing metal chelate sequences alternating with silane units were studied. The measurements were performed using thin films deposited from solution. The investigated polymers have interesting semiconducting characteristics. The correlations between these characteristics and the molecular structure of the respective polymers are discussed. 相似文献
6.
7.
Rusu G. B. Topala I. Borcia C. Dumitrascu N. Borcia G. 《Plasma Chemistry and Plasma Processing》2016,36(1):341-354
Plasma Chemistry and Plasma Processing - A study is conducted on the surface modification of synthetic woven textiles, using atmospheric-pressure plasma, for controlled adhesion for subsequent... 相似文献
8.
V. Cozan A. Butuc A. Stoleru M. Rusu Yushan Ni Mengxian Ding 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(12):899-906
Abstract New copolyether sulfones containing 2,5-bis(4-oxo-benzylidene)-cyclopentanone moieties were prepared in the conventional literature manner by condensing the dipotassium salts of 2,5-bis(4-hydroxyphenzyl- idene)cyclopentanone (I) and 2, 2-bis(4-hydroxyphenyl)propane (Bisphenol A, III) with 4,4′-dichlorodiphenyl sulfone (II), or by condensing the dipotassium salts of I with chlorine-terminated Bisphenol A-4,4′-di-chlorodiphenylsulfone copolymers (V). The resulting copolyether sulfones were confirmed by IR, viscometry, DSC measurements, thermooptical (TOA), and thermogravimetric analysis (TGA). 相似文献
9.
Chelate polymers derived from bis(2,4-dihydroxybenzaldehyde)propyl-enediimine M and bis(2,4-dihydroxyacetophenone)propylenediimine M (M = Fe2+, Co2+, Ni2+, Cu2+, Zn2+) with aromatic acid chlorides were prepared by interfacial polycondensation. Also, chelate polysiloxanes were obtained from the same monomers and α,ω-dichloropolydimethyl-siloxane. The spectral, thermal, magnetic, and electrical properties of the polychelates were studied. 相似文献
10.
Gergő Tóth Réka Mohácsi Ákos Rácz Aura Rusu Péter Horváth Lajos Szente Szabolcs Béni Béla Noszál 《Journal of inclusion phenomena and macrocyclic chemistry》2013,77(1-4):291-300
The enantiomer-specific characterization of ofloxacin–cyclodextrin complexes was carried out by a set of complementary analytical techniques. The apparent stability constants of the ofloxacin enantiomers with 20 different cyclodextrins at two different pH values were determined to achieve good resolution capillary electrophoresis enantioseparation either to establish enantioselective drug analysis assay, or to interpret and design improved host–guest interactions at the molecular level. The cyclodextrins studied differed in the nature of substituents, degree of substitution (DS), charge and purity, allowing a systematic test of these properties on the complexation. The seven-membered beta-cyclodextrin and its derivatives were found to be the most suitable hosts. Highest stability and best enantioseparation were observed for the carboxymethylated-beta-cyclodextrin (DS ~ 3.5). The effect of substitution pattern (SP) was investigated by molecular modeling, verifying that SP greatly affects the complex stability. Induced circular dichroism was observed and found especially significant on carboxymethylated-beta-cyclodextrin. The complex stoichiometry and the geometry of the inclusion complexes were determined by 1H NMR spectroscopy, including 2D ROESY techniques. Irrespective of the kind of cyclodextrin, the complexation ratio was found to be 1:1. The alfa-cyclodextrin cavity can accommodate the oxazine ring only, whereas the whole tricyclic moiety can enter the beta- and gamma-cyclodextrin cavities. These equilibrium and structural information offer molecular basis for improved drug formulation. 相似文献