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1.
A. I. Golovashkin G. N. Izmaïlov G. V. Kuleshova T. Q. Khánh A. M. Tskhovrebov L. N. Zherikhina 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,58(3):243-249
A scheme of magnetic calorimeter for registration of rare events
characterized by small energy release (cosmic rays, WIMPs, solitary X-ray
quanta) is proposed. The calorimeter is brought to operation by adiabatic
demagnetization, and its magnetic response is measured by a quantum
interferometer (SQUID, A. Barone and G. Paterno, Physics and applications of Josephson Effect). Special consideration is given to the specific
features of calorimeter operation in the ferromagnetic transition region.
The trigger registration of ultrasmall energy release by a ferromagnetic
system in the metastable state is described. 相似文献
2.
A. I. Golovashkin A. N. Zherikhin L. N. Zherikhina G. V. Kuleshova A. M. Tskhovrebov 《Journal of Experimental and Theoretical Physics》2004,99(2):370-378
Coherent interference effects of the following three types are experimentally discovered in disordered (randomized) systems: (i) Josephson behavior of the HTSC polycrystal BaKBiO in the phase-separated state; (ii) oscillations of bismuth film resistance, which are periodic in “direct” magnetic field; and (iii) mesoscopic oscillations of the resistance in the course of film growth. In the first case, the method for detecting the “latent” nonstationary Josephson effect is substantiated by the frequency modulation method for microwave radiation, while in the other two cases, simple models are proposed to explain the nature of coherent oscillations of the resistance. The analogy between the observed oscillations and the Josephson effect in randomized systems is discussed. 相似文献
3.
A. N. Grinev M. V. Mezentseva E. F. Kuleshova L. M. Alekseeva 《Chemistry of Heterocyclic Compounds》1986,22(5):499-503
The azo coupling of 2,5-diphenylpyrrole with arenediazonium chlorides has given previously unknown 3-arylazopyrroles and 4-phenylazo-3-phenylhydrazono-3H-pyrrole. The methylation and reductive acetylation of the anylazo derivatives have led to N-methylarylazo and acetylamino derivatives of 2,5-diphenylpyrrole. 3-Amino-2, 5-diphenylpyrrole has been obtained by the reduction of 3-p-chlorophenylazo-2,5-diphenylpyrrole. The aminomethylation of 2,5-diphenylpyrrole and its derivatives with bis(dialkylamino)methanes had led to aminomethyl derivatives.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5. pp. 612–615, May, 1986. 相似文献
4.
L. I. Kryvenko A. T. Soldatenkov O. V. Zvolinskii L. N. Kuleshova V. N. Khrustalev V. N. Gryshev S. A. Soldatova 《Chemistry of Heterocyclic Compounds》1997,33(6):691-697
Reaction of 2-acetylpyridine with 4-[2.2]paracyclophanyllithium or 4-acetyl[2.2]paracyclophane with 2-pyridllithium gives 1-([2.2]paracyclophan-4-yl)-1-(2-pyridyl)ethanol. Its molecular and crystalline structures have been studied by x-ray analysis. It was found that heating this alcohol in acid medium causes dehydration and heterocyclization to give 1-paracyclophanyl-1-pyridylethylene and 10-methyl[2.2]paracyclophano[4,5-bindolizine.For communication 9 see [1]. This report is also communication [5] in the series Synthesis, Structure, and Biological Activity of [2.2]Paracyclophanes (for communication 4 see [2]).Russian University of National Friendship, Moscow 117198. A. N. Nesmeyanov Institute of Organoelemental Compounds, Russian Academy of Sciences, Moscow 117813. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 793–800, June, 1997. 相似文献
5.
A. L. Soldatenkov L. N. Kuleshova T. K. Mandal V. N. Nesterov Zh. A. Mamyrbekova Yu. T. Struchkov 《Chemistry of Heterocyclic Compounds》1996,32(2):233-237
10,11-Dimethyl-9-(coumarin-3 -yl)-12-ethoxycarbonyl-8-oxa-10-azatricyclo[7,3,1.02.7]trideca-2,4,6-11-tetraene was isolated from the mixture of products from the condensation of salicyl aldehyde with acetoacetic ester and methylamine. Its molecular structure has been established by x-ray crystallography.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 259–264, February, 1996. 相似文献
6.
T. V. Stezhko N. P. Solov'eva E. F. Kuleshova V. G. Granik 《Chemistry of Heterocyclic Compounds》1988,24(2):151-153
Depending on the conditions of carrying out the reaction of dimethylformamide diethylacetal with the Meldrum's acid, either 2,2-dimethyl-4,6-dioxo-5-(N,N-dimethyl-aminomethylene)-1,3-dioxane or N,N,N1N1-tetramethylformamidinium salt of 2,2-dimethyl-4,6-dioxo-5-(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)methylene-1,3-di-oxane are formed. The two compounds can react with primary amines to form N-substituted 2,2-dimethyl-4.,6-dioxo-5-aminomethylene-1,3-dioxanes.For Communication 51, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 184–187, February, 1988. 相似文献
7.
T. V. Sycheva E. F. Kuleshova L. N. Yakhontov 《Chemistry of Heterocyclic Compounds》1984,20(8):901-905
Treatment of the ammonium (I) or benzylammonium salt of 2,6-dihydroxy-3-(-hydroxyethyl)-4-methyl-5-cyanopyridine (II) with a mixture of benzylamine and phosphorus pentoxide yielded 2-benzylamino-3-(-hydroxyethyl)-4-methyl-5-cyano-6-hydroxypyri-dine (III), which, when heated with phosphorus oxychloride, is converted to 1-benzyl-4-methyl-5-cyano-6-hydroxy-7-azaindoline (IV). The products of thermal fragmentation of II with benzylamine were studied by the method of chromato-mass spectrometry. In addition to compound III, N,N-dibenzylurea (V) and the dibenzylamide of malonic acid (VI) were preparatively isolated from the reaction products. The cyclization of I and II to 4-methyl-6-hydroxy-2,3-dihydro-7-azabenzofuran (VII) and 4-methyl-5-cyano-6-hydroxy-2,3-dihydro-7-azabenzofuran (VIII) was carried out. Heating VIII with benzylamine at 200–210°C led to compound III.For communication 64, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1105–1109, August, 1984. 相似文献
8.
A. N. Danilenko V. S. Romanova E. F. Kuleshova Z. N. Parnes E. E. Braudo 《Russian Chemical Bulletin》1998,47(11):2134-2136
The concentration dependences of heat capacities of aqueous solutions of several amino acid and peptide derivatives of fullerene
were measured by scanning differential calorimetry at 298 K. The heat capacities for the arginine, alanylalanine, and glycylvaline
derivatives dissolved in water depend slightly on concentration. The concentration dependences of the heat capacities of aqueous
solutions of the serine and alanine derivatives display extrema. The calculated contributions of hydration to the heat capacities
of the dissolved fullerene derivatives have both positive and negative signs.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2202–2204, November, 1998. 相似文献
9.
V. I. Vershinin M. P. Kuleshova N. A. Isachenko P. V. Shiligin 《Journal of Analytical Chemistry》2013,68(6):477-484
In estimating the total concentration of similar analytes recalculated to a standard substance Xst, different sensitivities of their determination result in a systematic error δc, depending on the choice of Xst and the composition of the analyzed mixture. Two methods of predicting the limiting values of this error (δc max), with and without the account of the properties of Xst are proposed and tested on model mixtures. The methods can be used if the total analytical signal linearly depends on the concentrations of analytes and is additive (spectrophotometry, conductometry, etc.). The value of δc max is independent of the ratio of analytes concentrations in the sample. To reduce δc max, one should equalize the sensitivities of the determination of all compounds of a given type and use analytes with medium sensitivities as Xst. 相似文献
10.
Summary An improved method was proposed for the preparation of the unsubstituted-propiothiolactone and some of its cleavage reactions were studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1081–1082, June, 1965 相似文献