全文获取类型
收费全文 | 293篇 |
免费 | 0篇 |
专业分类
化学 | 220篇 |
晶体学 | 3篇 |
数学 | 5篇 |
物理学 | 65篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 8篇 |
2017年 | 20篇 |
2016年 | 13篇 |
2015年 | 10篇 |
2014年 | 10篇 |
2013年 | 17篇 |
2012年 | 13篇 |
2011年 | 16篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 15篇 |
2007年 | 11篇 |
2006年 | 5篇 |
2005年 | 9篇 |
2004年 | 8篇 |
2003年 | 7篇 |
2002年 | 14篇 |
2001年 | 8篇 |
2000年 | 3篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1990年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1972年 | 3篇 |
1971年 | 4篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1962年 | 2篇 |
1960年 | 1篇 |
排序方式: 共有293条查询结果,搜索用时 328 毫秒
91.
A. S. Pozdnyakov A. I. Emel’yanov T. G. Ermakova G. F. Prozorova 《Polymer Science Series B》2014,56(2):238-246
New water-soluble functional polymer nanocomposites with nanoparticles of metallic silver in a matrix of 1-vinyl-1,2,4-triazole copolymers with crotonic acid have been synthesized. The resulting nanocomposites contain isolated silver nanoparticles 2–12 nm in diameter, preferably spherical in shape, and uniformly distributed in the polymer matrix. ATR IR spectroscopy has revealed that the nanoparticles affect the state of the carboxyl groups in the polymer matrix. It has been found that the size of zero-valent silver nanoparticles depends on the ratio of monomer units in the polymer matrix. The thermo-oxidative stabilities of the synthesized copolymers and polymer nanocomposites produced on their basis have been examined. 相似文献
92.
93.
94.
95.
T. G. Ermakova N. P. Kuznetsova G. F. Myachina V. A. Lopyrev 《Chemistry of Heterocyclic Compounds》2008,44(11):1365-1367
The reaction of 1-vinylnaphtho[2,3-d]imidazole with hydrogen chloride, alkyl halides, tetracyanoethylene, 2,4,7-trinitro-9-fluorenone,
and p-chloranil giving the corresponding quaternary salts and charge-transfer complexes has been studied. The structure of
the synthesized compounds has been confirmed from elemental analytical data and from IR and UV spectrometry.
Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov in his 70th jubilee.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1676–1679, November, 2008. 相似文献
96.
Kuznetsova A. S. Ermakova L. E. Antropova T. V. Anfimova I. N. Volkova A. V. 《Colloid Journal》2021,83(3):335-342
Colloid Journal - The chemical composition, structure, and electrokinetic characteristics have been studied for different vitreous materials, including basic silicate glasses and those modified... 相似文献
97.
Yana V. Shalaeva Ju E. Morozova V. V. Syakaev E. Kh Kazakova A. M. Ermakova I. R. Nizameev 《Supramolecular chemistry》2017,29(4):278-289
The water-soluble tetramethylensulfonatocalix[4]resorcinarene with methyl (C1) and pentyl (C5) substitutes on the lower rim forms colloid nanoscale aggregates with poly(diallyldimethylammonium chloride) (PDDA) in aqueous solutions. The size and stability of nanoparticles depend on concentrations of the components and their ratio in the ‘calixarene-polymer’ system. Ternary supramolecular complexes «polymer–macrocycle–guest molecule L-tryptophan (Trp) in conditions of spontaneous pH (3.80 and 4.78 for C1-PDDA and C5-PDDA systems, respectively) in an aqueous solution and in phosphate buffer (pH 7) were investigated by fluorescence method. The addition of the third component – PDDA – to the «non-aggregated C1–Trp» associates leads to the release of Trp in all studied conditions. The possibility of the «binding–release» process of L-tryptophan in «C5–Trp» associates after PDDA addition in the ternary complex is achieved and controlled by the structure of the macrocyclic self-associates and pH conditions. 相似文献
98.
The feasibility of using an amphiphilic photoactive derivative of aminoanthraquinone (C18) as both a local solvatochromic probe reporting its position in a micelle and a component of an analytical supramolecular unit in mixed micelles based on a nonionic surfactant, Triton X100, has been considered. The solvatochromism of the 1,8-anthraquinone derivative (C18) has, for the first time, been investigated. Dipole moments of C18 molecules have been determined within the frameworks of the Lippert–Mataga, Kawski, and Reichardt approaches. It has been found that the Δμ values, as calculated with the help of the first two approaches and the Onsager radius, which is, for C18, equal to 5.8 Å, are markedly higher than the value obtained in terms of the Reichardt model. Possible reasons for discrepancies, which arise between experimental data and theoretical predictions when analyzing the solvatochromic properties of dyes, have been briefly discussed. C18 has been employed as an example to show that, for chromophores capable of donor–acceptor interactions, the use of protic solvents is more reasonable, because they ensure realization of a wider spectrum of interactions with a probe, among which the van der Waals interactions play an important role. Therewith, polarization effects, rather than charge separation, make a substantial contribution. In the case of amphiphilic chromophores, “enveloping” of polar groups with hydrocarbon chains decreases the local dielectric permittivity and the probability of intermolecular donor–acceptor interactions (hydrogen bonding). The character of the microenvironment of C18 reporter in micelles has been determined with the use of the “relative polarity parameter” proposed in this work. This parameter makes it possible to compare results obtained for different models of solvatochromism. It has been shown that the characteristics of C18 microenvironment in micelles correspond to those of water–alcohol solutions, with the chromophoric moieties of dye molecules located in the polar region of a micelle, this region being formed by hydrated ethylene-oxide chains of Triton X100. Polar receptor groups of C18, which face the aqueous phase, complete the hydrophilic shell of a micelle, while hydrocarbon chains of both components compose its hydrophobic core. This structure of the normal micelle and the markedly higher intensity of fluorescence of the micellar system than that of an aqueous C18 solution make possible the analytical determination of metal ions in aqueous media. 相似文献
99.
Pozdnyakov A. S. Ivanova A. A. Emelyanov A. I. Ermakova T. G. Prozorova G. F. 《Russian Chemical Bulletin》2017,66(6):1099-1103
Russian Chemical Bulletin - New functional silver polymer nanocomposites were synthesized using copolymer of 1-vinyl-1,2,4-triazole with N-vinylpyrrolidone as a stabilizer of the formed metal... 相似文献
100.
V. I. Anikeev D. A. Stepanov A. Ermakova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2011,85(8):1336-1346
Calculations of thermodynamic data are performed for fatty acid triglycerides, free fatty acids, and fatty acid methyl esters,
participants of the transesterification reaction of vegetable oils that occurs in methanol. Using the obtained thermodynamic
parameters, the phase diagrams for the reaction mixture are constructed, and the chemical equilibria of the esterification
reaction of free fatty acids and the transesterification reaction of fatty acid triglycerides attained upon treatment with
supercritical methanol are determined. Relying on our analysis of the obtained equilibria for the esterification reaction
of fatty acids and the transesterification reaction of triglycerides attained upon treatment with lower alcohols, we select
the optimum conditions for performing the reaction in practice. 相似文献