全文获取类型
收费全文 | 231篇 |
免费 | 1篇 |
专业分类
化学 | 109篇 |
力学 | 34篇 |
数学 | 8篇 |
物理学 | 81篇 |
出版年
2022年 | 3篇 |
2021年 | 8篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 9篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 7篇 |
2013年 | 13篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 8篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 5篇 |
2005年 | 7篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 5篇 |
1983年 | 3篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1972年 | 7篇 |
1971年 | 2篇 |
1970年 | 8篇 |
1969年 | 3篇 |
1968年 | 2篇 |
1967年 | 4篇 |
1966年 | 2篇 |
1965年 | 3篇 |
排序方式: 共有232条查询结果,搜索用时 46 毫秒
41.
V. B. Bogdanov A. N. Pikhtin V. T. Prokopenko A. D. Yas'kov 《Journal of Applied Spectroscopy》1989,51(4):1097-1100
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 51, No. 4, pp. 654–659, October, 1989. 相似文献
42.
Yuliya Prokopenko Valdas Jakštas Vaidotas Žvikas Victoriya Georgiyants Liudas Ivanauskas 《Natural product research》2019,33(13):1961-1963
The aim of research was to study the content of amino acids using in extracts of Fumaria schleicheri L., Ocimum basilicum L., and Corylus avellana L. by HILIC MS/MS method. Separation of amino acids in the samples was carried out with Acquity H-class UPLC system (Waters, Milford, USA) equipped with SeQuant ZIC-Hilic collumn (2.1 × 150 mm, 3.5 μm) (Merck Millipore, Darmstadt, Germany). The MS/MS fragment ion chromatograms of the test solutions established the presence of 19 amino acids. The obtained results have shown that O. basilicum L. characterized the highest concentrations of different neurogenic amino acids (128.1 mg/kg), comparing with F. schleicheri L. and C. avellana L. (57.72 and 52.91 mg/kg, respectively). 相似文献
43.
A. G. Tolstikov O. F. Prokopenko L. V. Spirikhin G. A. Tolstikov 《Russian Chemical Bulletin》1992,41(5):926-931
Low-molecular-weight -O-glycosides with aliphatic polyfunctional aglycones were synthesized by Horner-Emmons olefination of O-glycosylated ,-unsaturated aldehydes prepared by acid opening of the dihydropyran ring in totally acylated lactal, cellobial, and gentiobial.Institute of Organic Chemistry, Ural Branch, Russian Academy of Sciences, 450054 Ufa. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 5, pp. 1176–1181, May, 1992. 相似文献
44.
L. I. Kozhevina E. B. Prokopenko V. I. Rybachenko E. V. Titov 《Journal of Structural Chemistry》1995,36(2):276-280
The effects of fluorine substitution in benzene rings and quaternization of the nitrogen atom in Schiff bases of the general
formula R−CH=N−R′ on the vibration characteristics of the azomethine group are analyzed. Normal vibrations and intensities
of IR bands are calculated. It is shown that the spectroscopic behavior of the C=N bond is almost independent of the electronic
effects of substituents in the benzene rings of the molecules studied, and the changes in the intensities of νC=N bands are caused by interactions between vibrations. This points to the stability of this bond in the series of molecules
under consideration. For diphenylnitrones, N→O vibrations are identified.
L. M. Litvinenko Institute of Physical Organic Chemistry and Carbon Chemistry. Translated fromZhurnal Strukturnoi Khimii, Vol. 36, No. 2, pp. 310–315, March–April, 1995.
Translated by L. Smolina 相似文献
45.
A method for determining the natural frequencies and modes of ribbed shallow shells with rectangular planform on an elastic
foundation is developed. The method takes into account the discrete arrangement of the ribs. A shallow spherical shell with
square planform is considered as example to analyze the effect of the number of ribs and the Winkler and Pasternak coefficients
of subgrade reaction on the natural frequencies and modes. It is recommended to take into account the discrete arrangement
of ribs when they are few 相似文献
46.
47.
A. P. Boichenko A. V. Prokopenko N. A. Yakovenko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2007,81(11):1877-1879
The first results on the electroluminescence of the MK-40L, MK-40K, MF-4SK, MA-40L, MA-41L, MA-40K, and MA-41K ion-exchange polymeric membranes in the swollen state are reported. It was found that electroluminescence had the character of flashes. Intensity and time characteristics of electroluminescence were determined over the range of NaCl solution concentrations from 0 to 0.1 M. The special features of electroluminescence from the ion-exchange membranes were determined from their photographs. It was found that the membranes in the air-dry state did not exhibit electroluminescence. 相似文献
48.
Krysina O. V. Ivanov Yu. F. Prokopenko N. A. Shugurov V. V. Petrikova E. A. Tolkachev O. S. 《Russian Physics Journal》2021,64(2):309-316
Russian Physics Journal - The paper deals with the synthesis of coating based on molybdenum and molybdenum nitrides using cathodic arc deposition without the plasma assistance. The properties,... 相似文献
49.
Technical Physics - Dispersion properties of eigenwaves of an anisotropic cylindrical solid-state waveguide without frequency dispersion in permittivity tensor components have been analyzed... 相似文献
50.
The design characteristics of the optical cuvette suggested here provide the possibility of accomplishing the uniaxial orientation
of gels with retention of the constancy of their volume, which makes it possible to carry out highly accurate polarization
measurements with commercial spectropolarimeters in directions parallel and perpendicular to the axis of orientation. Using
as examples polyacrylamide gels containing biologically important molecules and membranes, the possibility of measuring absorption
spectra, the linear dichroism, and the dispersion of optical rotation is demonstrated.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 2, pp. 286–289, March–April, 1999. 相似文献