全文获取类型
收费全文 | 108篇 |
免费 | 0篇 |
专业分类
化学 | 51篇 |
晶体学 | 5篇 |
数学 | 12篇 |
物理学 | 40篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 3篇 |
2012年 | 7篇 |
2011年 | 4篇 |
2010年 | 11篇 |
2009年 | 7篇 |
2008年 | 4篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有108条查询结果,搜索用时 250 毫秒
1.
Methods for solving the Cauchy problem are suggested. The use nonpolynomial splines, which ensure the required accuracy for a rather wide class of functions. Computational results are presented. 相似文献
2.
A. V. Fionov M. V. Burova E. A. Tveritinova I. V. Krylova 《Russian Chemical Bulletin》2006,55(4):639-644
Donor-acceptor properties of alumina modified with lithium cations were studied by ESR of paramagnetic complexes of adsorbed
anthraquinone. The results were compared with the data on negative ion emission (exoemission) accompanying the decomposition
of isopropyl alcohol in the adsorption layer. The data on the activity measured by the pulse microcatalytic technique in isopropyl
alcohol decomposition are discussed. Small additives of lithium were found to promote catalytic activity of the samples. The
role of acid and basic sites in isopropyl alcohol decomposition was discussed.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 616–621, April, 2006. 相似文献
3.
N. M. Smirnova N. M. Cherdantseva O. A. Burova V. M. Nesterov T. S. Safonova 《Chemistry of Heterocyclic Compounds》1990,26(7):811-815
6-Aminouracils and N-substituted derivatives are cyanoacetylated to give 5-cyanoacetyl-6-aminouracils. In the presence of bases these are converted to pyrido[2,3-d]pyrimidine-2,4,5-triones in high yields.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 971–975, July, 1990. 相似文献
4.
A. G. Bubnov E. Yu. Burova V. I. Grinevich V. V. Rybkin J.-K. Kim H.-S. Choi 《Plasma Chemistry and Plasma Processing》2006,26(1):19-30
This study investigated the processes for the destruction of phenol and its derivatives (resorcin and pyrocatechol) in aqueous
solutions under the action of an oxygen dielectric barrier discharge (DBD) at atmospheric pressure in the presence or absence
of catalysts in the plasma zone. It was shown that the DBD had a high decomposition efficiency for phenol and its derivatives
(up to 99%). Phenol was the most stable and pyrocatechol was the least. In a plasma-catalytic hybrid process, the effective
rate constants for phenol, resorcin and pyrocatechol decomposition were 11, 4 and 2.5 times higher, respectively, than those
for the DBD treatment without catalysts. The process also resulted in a 1.4, 1.6 and 1.2 times higher rate of carboxylic acid
formation for phenol, resorcin and pyrocatechol, respectively. The fractional conversion into the respective carboxylic acids
reached 56% for phenol and 68% for resorcin and pyrocatechol. 相似文献
5.
The force fields, in-plane vibrations, and relative intensities of Raman spectra have been calculated and analyzed for the N1H and N3H tautomers of imidazole, imidazolium cation, and their model structures. The results obtained for the isolated state of imidazole correspond to the intramolecular mechanism of proton transfer. 相似文献
6.
Reshetnikov D. V. Burova L. G. Rybalova T. V. Bondareva E. A. Patrushev S. S. Evstropov A. N. Shults E. E. 《Chemistry of Natural Compounds》2022,58(5):908-915
Chemistry of Natural Compounds - Cross-coupling of 8-bromocaffeine, 8-bromo-1-butyltheobromine, or 8-bromo-7-butyltheophylline with α-, β-, or ω-amino-acid methyl or t-butyl ester... 相似文献
7.
R. Z. Deyanov B. M. Shchedrin E. M. Burova 《Computational Mathematics and Modeling》2009,20(3):237-246
Tikhonov’s regularization method is applied to develop an efficient algorithm and the corresponding programs for identifying
a smooth background line. The algorithm can also be used to construct the filtering function. Some applications are examined.
Translated from Prikladnaya Matematika i Informatika, No. 30, pp. 25–34, 2008. 相似文献
8.
We study a mathematicalmodel of X-ray analysis of polycrystal mixtures. We describe a new version of the Phasan program for
phase analysis, based on a multi-document interface. Two figures. Bioliography: 6 titles.
Translated fromProblemy Matematicheskoi Fiziki, 1998, pp. 245–255. 相似文献
9.
G.?N.?TenEmail author T.?G.?Burova V.?I.?Baranov 《Journal of Applied Spectroscopy》2005,72(1):104-110
Calculations of the frequencies and absolute intensities of the IR bands of plane vibrations of thymine and N1,N3-deuterothymine in various phase states have been carried out. It has been shown that in the polycrystalline state thymine forms hydrogen bonds C2=O8...HN1 and C2=O8...HN3, and in an aqueous solution the intermolecular interaction is realized by means of the hydrogen bonds O8...HO and O...HN1.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 1, pp. 99–105, January–February, 2005. 相似文献
10.
O. A. Burova I. D. Bystryakova N. M. Smirnova T. S. Safonova 《Chemistry of Heterocyclic Compounds》1990,26(5):561-564
1,3-Dimethyl-2,4,5-trioxo-7-amino-8H-pyrido[2,3-d]pyrimidine has been brominated, chlorosulfonated, treated with potassium nitrite in acidic medium, and with the Vilsmeier reagent. Acylation and alkylation of 1,3-dimethyl-2,4,5-trioxo-6-bromo-7-aminopyrido[2,3-d]pyrimidine is also discussed.For Communication 1, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 662–666, May, 1990. 相似文献