全文获取类型
收费全文 | 59篇 |
免费 | 0篇 |
专业分类
化学 | 34篇 |
力学 | 3篇 |
数学 | 3篇 |
物理学 | 19篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 3篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1969年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有59条查询结果,搜索用时 15 毫秒
1.
A. A. Sobanov A. V. Zolotukhin I. V. Galkina V. I. Galkin R. A. Cherkasov 《Russian Journal of General Chemistry》2006,76(3):421-429
A complex spectral (UV, IR, and 31P NMR), preparative, and kinetic investigation of the mechanism of the noncatalytic variant of the Pudovik reaction in the series of imines was carried out. The reaction proceeds through a four-center cyclic transition state. The transition state is highly labile, which determines its high sensitivity to the structure of the reagents, the nature of the solvent and catalyst, and some other factors. The necessary condition for the hydrophosphorylation of imines to occur is the participation of proton-donor reagents and acidic admixtures, specifically hydrolysis products of dialkyl hydrogen phosphites, such as monoalkyl dihydrogen phosphates and phosphorous acid, which act as acid catalysts. When the starting reagents are thoroughly purified and no such catalysts are present, the Pudovik reaction fails to occur in the imine series. 相似文献
2.
Daniel Romero Nieto Mikhail G. Zolotukhin Lioudmila Fomina Serguei Fomine 《Journal of Physical Organic Chemistry》2010,23(9):878-884
Energies of mono‐ and multiprotonation for 1,2,3‐indanetrione and ninhydrin in triflic acid (TFSA) media were estimated at PBE0/aug‐cc‐pvtz//6‐31+G** level of theory. The reactivity of formed intermediates in the reaction of aromatic electrophilic substitution has been studied at the same level of theory. It appears that the basicity of carbonyl groups in 1,2,3‐indanetrione is extremely low due to mutual influences of carbonyl groups. Carbonyl 2 is the least basic but the most reactive in accordance with experiment. Calculations demonstrated that monoprotonated intermediates are the principal reactive species in the reaction of hydroxyalkylation of 1,2,3‐indanetrione in TFSA. A new isomerization mechanism of 2,2‐diaryl‐1,3‐indanediones to 3‐(diarylmethylene)isobenzofuranones in TFSA media has been proposed. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
3.
Cherkasov V. K. Druzhkov N. O. Zolotukhin A. A. Shavyrin A. S. Egorova E. N. 《Russian Chemical Bulletin》2015,64(11):2718-2724
Russian Chemical Bulletin - A reaction of perfluoroalkyltrimethylsilanes with 3, 6-di(tert-butyl)-o-benzoquinone was used to obtain new perfluoroalkyl-substituted sterically hindered... 相似文献
4.
N. V. Grevtsev V. D. Zolotukhin Yu. M. Kashurnikov V. A. Letyagin 《Journal of Applied Mechanics and Technical Physics》1974,15(2):215-219
Conductor damage has been examined when the current is switched off at various stages in electrical explosion. If the switching is fairly rapid, kink instability growth is accompanied by formation of vapor bubbles at the kinks within the volume of the liquid metal. Later switching results in vapor bubbles uniformly distributed along the conductor. Cumulative ejection occurs under certain conditions. A qualitative interpretation is given. 相似文献
5.
It is found that the electron concentration is dependent on the pressure, the electrical conditions, and the thermophysical properties of the electrode material. 相似文献
6.
7.
Mikhail G. Zolotukhin Javier de Abajo Julio C. Alvarez Jose G. de la Campa Daniel R. Rueda 《Journal of polymer science. Part A, Polymer chemistry》1998,36(8):1251-1256
Linear polyaryl(ether ketones) containing tert-butyl pendent groups were prepared from aromatic hydrocarbons and aromatic diacid chlorides, both classes of monomers containing tert-butyl pendent groups. The polymers were prepared in high yield and high molecular weight by low-temperature precipitation polycondensation in 1,2-dichloroethane. The presence of meta-oriented moieties and bulky pendent groups played a beneficial role with regard to solubility, while the thermal transitions and thermal resistance were not greatly impaired relative to conventional all para-oriented polyaryl(ether–ketones). The current polyaryl(ether–ketones) showed glass transition temperatures in the range 170–240°C and decomposition temperatures, as measured by TGA, of about 500°C. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1251–1256, 1998 相似文献
8.
Daniel Romero Nieto Serguei Fomine Mikhail G. Zolotukhin Lioudmila Fomina Maria del Carmen Gutirrez Hernandez 《Macromolecular theory and simulations》2009,18(2):138-144
The stability and reactivity of mono‐ and multi‐protonatred N‐substituted isatin derivatives were studied at PBE0/aug‐cc‐pvtz//PBE0/6‐31+G** level of theory in triflic acid (TFSA) solution. Calculations showed that the monocationic intermediates are the principal reactive species in the reaction of hydroxyalkylation of isatin derivatives in TFSA media. Electron‐withdrawing substituents on the nitrogen atom increase the reactivity of isatin‐containing electrophiles towards aromatic hydrocarbons, in accordance with their expected electronic influence. Steric factors also play an important role in the reactivity of isatin‐containing electrophiles, especially in the second reaction step, due to their more sterically hindered reactive center.
9.
A. A. Zolotukhin M. P. Bubnov V. K. Cherkasov G. A. Abakumov 《Russian Journal of Coordination Chemistry》2018,44(4):272-283
The key regularities of redox isomerism of six-coordinate bis-semiquinonato cobalt complexes in the crystalline phase are considered. The factors determining the temperature of transition between the redox isomers of various cobalt complexes (mononuclear and binuclear complexes, coordination polymers) were described. The transition parameters were shown to depend not only on the electronic and spatial structure of the ligands in a particular complex, but also on the crystal structure of the complex and intermolecular interactions in the lattice. 相似文献
10.
We have observed that carbon deposits obtained by atomizing graphite in an electric arc in an atmosphere of argon and helium
exhibit porosity and possess fractal structure. The results of measurements of the internal friction Q
−1 and the effective Young’s modulus E as a function of temperature are presented. Data on the resistivity, density, and microhardness of the carbon deposits are
presented. A possible mechanism for formation of fractal structures in carbon deposits is discussed.
Fiz. Tverd. Tela (St. Petersburg) 40, 584–586 (March 1998) 相似文献