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排序方式: 共有62条查询结果,搜索用时 15 毫秒
1.
S. I. Dolinsky V. P. Druzhinin M. S. Dubrovin V. B. Golubev V. N. Ivanchenko A. P. Lysenko A. A. Mikhailichenko E. V. Pakhtusova A. N. Peryshkin S. I. Serednyakov Yu. M. Shatunov V. A. Sidorov 《Zeitschrift fur Physik C Particles and Fields》1989,42(4):511-518
The results of the measurements of radiative decays of ρ and ω mesons with the Neutral Detector at thee + e ? collider VEPP-2M are presented. The branching ratio of the decay ω→π 0γ was measured with higher than in previous experiments accuracy: $${\rm B}(\omega \to \pi ^0 \gamma ) = 0.0888 \pm 0.0062$$ . The ρ0→π 0 γ branching ratio was measured for the first time: $$B(\rho ^0 \to \pi ^0 \gamma ) = (7.9 \pm 2.0) \cdot 10^{ - 4} $$ . The decays ρ, ω→ηγ were studied. Their branching ratios with the assumption of constructive ρ?ω interference are: $$\begin{gathered} B(\omega \to \eta \gamma ) = (7.3 \pm 2.9) \cdot 10^{ - 4} , \hfill \\ B(\rho \to \eta \gamma ) = (4.0 \pm 1.1) \cdot 10^{ - 4} \hfill \\ \end{gathered} $$ . The branching ratios of ρ, ω→ηγ and ω→e + e ? decays were also measured: $$\begin{gathered} B(\omega \to \pi ^ + \pi ^ - \pi ^0 ) = 0.8942 \pm 0.0062, \hfill \\ B(\omega \to e^ + e^ - ) = (7.14 \pm 0.36) \cdot 10^{ - 5} \hfill \\ \end{gathered} $$ . The upper limit for the ω→π 0 π 0 γ branching ratio was placed: B(ω→π 0 π 0 γ)<4·10?4 at 90% confidence level. 相似文献
2.
Balakin V Alexandrov VA Mikhailichenko A Flöttmann K Peters F Voss G Bharadwaj V Halling M Holt JA Buon J Jeanjean J LeDiberder F Lepeltier V Puzo P Heimlinger G Settles R Stierlin U Hayano H Ishihara N Nakayama H Oide K Shintake T Takeuchi Y Yamamoto N Bulos F Burke D Field R Hartman S Helm R Irwin J Iverson R Rokni S Roy G Spence W Tenenbaum P Wagner SR Walz D Williams S 《Physical review letters》1995,74(13):2479-2482
3.
A. P. Avdeenko S. A. Konovalova O. N. Mikhailichenko S. V. Shelyazhenko V. V. Pirozhenko L. M. Yagupol’skii 《Russian Journal of Organic Chemistry》2012,48(2):221-233
In reactions with sodium sulfinates of N-substituted 1,4-benzoquinone monoimines with the quinoid ring having free positions
2 and/or 6 the fraction of products of 1,4-addition of the sulfinate ion grows in the series ArSO2 → MeSO2 → CF3SO2. In the case of 2,6-dimethyl derivatives the 1,6-addition is preferable, and the amount of products of 6,1-addition decreases. 相似文献
4.
E. Yu. Liberman A. V. Naumkin A. A. Revina A. I. Mikhailichenko M. V. Tsodikov S. A. Medvedeva T. V. Kon’kova 《High Energy Chemistry》2018,52(4):307-311
The effect of electron-beam irradiation on the catalytic properties of PdO/CeO2 has been examined. It has been found that irradiation in the range of 15–30 kGy results in an increase in the concentration of the radical anion [O?], thereby enhancing the catalytic activity of PdO/CeO2. 相似文献
5.
E. V. Kosheleva M. A. Pentin L. A. Kalinina T. V. Mikhailichenko T. A. Lapteva Yu. N. Ushakova 《Russian Journal of Electrochemistry》2017,53(7):790-798
The chemical method of preparation of oxide precursors was used to obtain sulfide-conducting ionic salts of CaY2S4, BaSm2S4 and heterogeneous additives of ZrS2 and SiS2, accordingly. The sintering modes for obtaining the heterogeneous systems of CaY2S4–ZrS2 and BaSm2S4–SiS2 were chosen. Samples were characterized using the methods of X-ray phase analysis and microprobe analysis. The methods of thermogravimetric and differential thermal analysis were used to determine thermal stability of samples. The temperature and concentration dependences of conductivity and average ionic transport numbers were studied. The range of compositions of heterogeneous mixtures is determined in which conductivity considerably exceeds conductivity of the basic sulfide-conducting solid electrolytes. 相似文献
6.
7.
A. V. Akindinov Yu. T. Kiselev A. N. Martem’yanov V. I. Mikhailichenko K. R. Mikhailov S. A. Pozdnyakov Yu. V. Terekhov M. M. Chumakov V. A. Sheinkman 《JETP Letters》2000,72(3):100-105
Energy dependence of the differential cross sections for the production of K +-mesons with a momentum of 1.28 GeV/c (c is the speed of light) by protons incident on Be, Al, Cu, and Ta nuclei was measured for energies both above and below the K +-meson production threshold in pp collisions. Evidence is given for the dominance of the mechanism of direct production in the experiment. The characteristics of momentum distribution are determined for nucleons in the Be and Al nuclei up to 650 MeV/c. The data cannot be described in the model of nuclear spectral function. 相似文献
8.
A. P. Avdeenko S. A. Konovalova O. N. Mikhailichenko S. V. Shelyazhenko V. V. Pirozhenko L. M. Yagupol’skii 《Russian Journal of Organic Chemistry》2011,47(4):510-519
New N-alkyl(trifluoromethyl)sulfonyl 1,4-benzoquinone monoimines were synthesized, and their thiocyanation gave 5-alkyl(trifluoromethyl)sulfonylamino-1,3-benzoxathiol-2-ones.
An intermediate thiocyanation product, 5-trifluoromethylsulfonylamino-1,3-benzoxathiol-2-imine, was isolated for the first
time. 相似文献
9.
10.
A. A. Chesnyuk S. N. Mikhailichenko V. N. Zaplishnyi L. D. Konyushkin S. I. Firgang 《Chemistry of Heterocyclic Compounds》2008,44(3):339-348
We have studied the reaction of 2,5-dimethoxytetrahydrofuran with 4,6-disubstituted 2-amino-1,3,5-triazines with the aim of
obtaining novel coupled polyheterocyclic systems with potential bioactivity. Reaction conditions were optimized. A series
of novel 4,6-disubstituted 2-(1H-1-pyrrolyl)-sym-triazines was obtained. It was found that the product yields depended on
the nature of the substituent in the 4 and 6 positions of the triazine ring and on the reaction conditions.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 440–451, March, 2008. 相似文献