全文获取类型
收费全文 | 59篇 |
免费 | 0篇 |
专业分类
化学 | 52篇 |
数学 | 3篇 |
物理学 | 4篇 |
出版年
2022年 | 1篇 |
2018年 | 2篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有59条查询结果,搜索用时 0 毫秒
1.
O. I. Sharova 《Radiophysics and Quantum Electronics》1995,38(6):344-358
A new scale of distances to planetary nebulae is proposed. This scale is free of the common a priori assumptions about the evolution of the nebulae and exciting stars. The recently found regression relationship between radius and temperature of the central star is employed. As the initial data for distance finding, we use the radio flux density of the nebulae and the stellar magnitude of the nucleus, or one of these parameters and the central star temperature. The distances to 75 planetary nebulae have been calculated, and their linear dimensions and hydrogen atom concentrations have been determined. It is found that the ionized masses of the planetary nebulae range from 10–3 M to 1.419M.Radiophysical Research Institute, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 6, pp. 522–542, June, 1995. 相似文献
2.
A one-step synthesis of alkylN-(-amidomethyl)glycinates from glycine esters or their salts, formaldehyde, and aroylamides was developed. The effect of the structure of the amide component and the reaction conditions on the yields of the products was investigated.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1078–1080, June, 1994. 相似文献
3.
O. I. Artyushin E. V. Sharova I. L. Odinets S. V. Lenevich V. P. Morgalyuk I. G. Tananaev G. V. Pribylova G. V. Myasoedova T. A. Mastryukova B. F. Myasoedov 《Russian Chemical Bulletin》2004,53(11):2499-2507
An efficient method for the synthesis of secondary alkylamides of phosphorylacetic acids (APA) was proposed. The method involves amidation of ethyl phosphorylacetates with primary aliphatic amines. The scope of reaction was determined. Reactions with ethylenediamine and 1,4-diaminobutane yield the corresponding bisamides; in the case of 1,3-diaminopropane, N-(3-aminopropyl)diphenylphosphorylacetamide or N,N-propylenebis(diphenylphosphorylacetamide) was obtained, depending on the reaction conditions. The extraction of americium(III) complexes and the sorption of uranium(VI) by sorbents with physically sorbed APA from nitric acid solutions were studied. There is no correlation between the partition coefficient of americium(III) and the structure of APA; in the sorption of uranium(VI), the degree of extraction depends on the complexone structure.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2394–2402, November, 2004. 相似文献
4.
Gorelov V. P. Kuzin B. L. Balakireva V. B. Sharova N. V. Vdovin G. K. Beresnev S. M. Kleshchev Yu. N. Brusentsov V. P. 《Russian Journal of Electrochemistry》2001,37(5):505-511
The electroconductivity and the nature of conduction of vacuum-dense ceramics BaPr1 – x
Y
x
O3 – (x= 0.05–0.15) is studied at temperatures of 373 to 985°C,
of 2.1 × 104to 10–11Pa, and
of 40 to 2400 Pa. The coefficient of linear thermal expansion is measured. The ceramics have a perovskite structure and are practically p-type semiconductors with a maximum conductivity of 0.26 S cm–1at x= 0.10 and 800°C, in air. The share of ionic (proton) conductivity of the ceramics does not exceed 0.2–0.4%. The conductivity is weakly dependent on the air humidity. In a hydrogen-containing atmosphere, the ceramics undergoes reduction with destruction. Boundaries of thermodynamic stability of BaPr0.9Y0.1O3 – at 500–900°C are determined. 相似文献
5.
N-Nitroso,N-sulfonyl, andN-acyl derivatives ofN-(amidomethyl)- andN-(imidomethyl)-glycine esters have been synthesized by the reactions of these esters with HNO2 or with sulfonylating and acylating reagents.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1299–1305, July, 1995. 相似文献
6.
Irina L. Odinets Oleg I. Artyushin Elena V. Sharova Ekaterina V. Matveeva Alexandr N. Turanov Vasilii K. Karandashev 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-3):146-149
Abstract The extraction properties of a series of carbamoylmethylphosphine oxides and β-aminophosphine oxides with lanthanide metal ions is presented. Tris[bis(2-diphenyl- phosphorylethyl)-aminoethyl]amine is shown to be highly effective for extraction of Re(VII). 相似文献
7.
Artyushin O. I. Sharova E. V. Yarkevich A. N. Genkina G. K. Vinogradova N. V. Brel V. K. 《Russian Chemical Bulletin》2015,64(9):2172-2177
Methods were developed for the first time for the modification of the natural neuropeptides Ile–Gly–Leu and Leu–Gly–Leu simultaneously with the phosphonate moiety and the triazole ring or solely with the triazole ring by means of click chemistry. All of the peptidomimetics synthesized were isolated as a mixture of diastereomers and were characterized by spectroscopic methods.
相似文献8.
B. I. Petrov G. A. Abakumov A. V. Arapova E. V. Sharova O. I. Artiushin I. L. Odinets N. M. Lazarev Yu. A. Bessonova 《Russian Journal of General Chemistry》2011,81(11):2231-2234
The synthesis and the studies of properties of diphenyl[dialkyl(alkyl)carbamoylmethyl]phosphine oxides by differential scanning
calorimetry, mass spectrometry and Knudsen effusion method were performed. The thermodynamic parameters of melting and vaporization
were calculated. 相似文献
9.
The total alkaloids of the roots ofConvolvulus subhirsutus collected in the period of vigorous growth close to the village of Dzhilga, Chimkent province, have been studied. From the
phenolic fraction of the total alkaloids of this species of plant we have isolated phyllalbine and convolidine for the first
time. From the nonphenolic fraction of the combined bases we isolated convolvine, which has been found previously, the new
alkaloid confoline, and an unidentified base (III). On the basis of spectral characteristics and some spectral transformations
it has been established that confoline has the structure of (+)-N-formylconvolvine.
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh
Soedinenii, No. 5, pp. 672–676, September–October, 1980. 相似文献
10.
O. I. Artyushin E. V. Sharova I. L. Odinets K. A. Lyssenko D. G. Golovanov T. A. Mastryukova G. A. Pribylova I. G. Tananaev G. V. Myasoedova 《Russian Chemical Bulletin》2006,55(8):1440-1447
A one-pot synthetic route to phosphorylacetic acid N-aryl(alkylaryl)amides, including those containing two phosphorylmethylcarbamoyl moieties attached to the arene framework,
has been developed. The method is based on reactions of amines with the corresponding acid chlorides generated in situ with the use of phosphorus trichloride as a mild chlorinating agent. The compositions and structures of the compounds obtained
and their extraction ability toward AmIII were determined. Suggestions were made about the compositions of the extracted complexes with phosphorylacetic acid N-aryl(alkylaryl)amides.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1387–1394, August, 2006. 相似文献