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341.
The present work is devoted to the development of the method of laser photothermal radiometry with a view to increasing its
spatial resolution over the depth of the specimen when surface layers of the substance of thickness about 1 μm or less are
to be investigated. As an example, results of an investigation of radiation absorption in the surface layer of a lithium niobate
crystal are presented. The absorption index measured at a wavelength of 1.08 μm was ∼0.6 cm−1.
“Polyus” Research Institute, 3, Vernadskii Ave., Moscow, 117342, Russia. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 64, No. 1, pp. 82–84, January–February, 1997. 相似文献
342.
343.
The selectivity of the position of nitration of 1-methylpyrrole, 1,2-dimethylpyrrole, 1,2-dihydropyrrolizine, and 5,6,7,8-tetrahydropyrrocoline was found. In contrast to the selectivity of substitution during nitration of their carbocyclic analogs, o-xylene, indane and tetraline, the fraction of the -nitro-isomer in the nitration products of 1,2-dimethylpyrrole is smaller than the fraction of -nitro derivatives of 1,2-dihydropyrrolizine and 5,6,7,8-tetrahydropyrrocoline, and in the two latter cases the isomers are almost equally distributed. During nitration of the above bicyclic pyrroles, the Mills-Nixon effect does not appreciably influence the selectivity of the position of the reaction.See [1] for Communication 23.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1489–1491, November, 1987. 相似文献
344.
Zavgorodnii V. S. Novoselov A. V. Mikhailov L. E. Skvortsov N. K. Fauvarque J.-F. 《Russian Journal of Organic Chemistry》2003,39(2):242-247
Stannylation of 3,6-dibromocarbazoles with lithium trimethylstannanide in THF was investigated. At treating 3,6-dibromo-9-alkylcarbazoles with lithium trimethylstannanide arise 3,6-bis(trimethylstannyl)-9-alkylcarbazoles. The 3,6-dibromocarbazole unsubstituted at nitrogen affords lithium 3,6-bis(trimethylstannyl)-carbazol-9-yl. The conditions of its generation, alkylation, and conversion into 3,6-bis(trimethylstannyl)carbazole are considered. 相似文献
345.
346.
347.
We prove that the IsekiM-integral is substantially more general than the Denjoy integral.
Translated fromMatematicheskie Zametki, Vol. 62, No. 5, pp. 766–772, November, 1997.
Translated by I. P. Zvyagin 相似文献
348.
N. D. Abramova L. V. Andriyankova A. G. Mal'kiná V. K. Bel'skii É. I. Kositsyna Yu. M. Skvortsov 《Russian Chemical Bulletin》1989,38(10):2156-2159
The reaction of thiourea with 4-hydroxy-4-methyl-2-pentynenitrile in triethylamine is accompanied by heterocyclization and the formation of 2-amino-4-cyano-methylene-5, 5-dimethylthiazoline, whose structure was established by x-ray structural analysis (XSA).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2344–2346, October, 1989. 相似文献
349.
V. A. Skvortsov 《Radiophysics and Quantum Electronics》1990,33(12):991-997
Gor'kii State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 33, No. 12, pp. 1349–1356, December, 1990 相似文献
350.