排序方式: 共有151条查询结果,搜索用时 15 毫秒
61.
N. G. Peresadko Yu. A. Alexandrov S. G. Gerasimov V. A. Dronov V. G. Larionova A. V. Pisetskaya E. I. Tamm V. N. Fetisov S. P. Kharlamov L. N. Shesterkina 《Physics of Atomic Nuclei》2010,73(11):1942-1947
In a track nuclear photoemulsion exposed to a beam of 7Li nuclei accelerated to a momentum of 3 GeV/c per nucleon at the synchrophasotron of the Joint Institute for Nuclear Research (JINR, Dubna), 13 events in which 7Li nuclei interacting with protons break up into 3H and 4He fragments were detected among 3730 inelastic-interaction events. For this fragmentation channel, the cross section was
found to be 8 ± 2 mb. The average value of the fragment total transverse momentum was 214 ± 5 MeV/c. This value exceeds markedly the average value of the transverse-momentum transfer in the coherent dissociation of 7Li nuclei on track-emulsion nuclei (166±5MeV/c). The recoil-proton transverse momentum was on average 98% of the total proton momentum. The longitudinal-momentum distribution
of protons was characterized by a variance of 16 MeV/c and a mean value of 37 ± 2MeV/c. 相似文献
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Ivan N. Bardasov Anastasiya U. Alekseeva Sergey S. Chunikhin Maria A. Shishlikova Oleg V. Ershov 《Tetrahedron letters》2019,60(17):1170-1173
The synthesis of pyridine derivatives containing a buta-1,3-diene-1,1,3-tricarbonitrile fragment via the base-promoted reaction of benzalacetones and malononitrile dimer with subsequent oxidation is described. The influence of the substituents on the spectral-luminescent and electrochemical properties was also investigated. 相似文献
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Andrey V. Kustov Anastasiya V. Bekeneva Vladimir I. Saveliev Valeriy P. Korolyov 《Journal of solution chemistry》2002,31(1):71-80
The enthalpies of solutions of tetraethylammonium and tetrabutylammonium bromides in the water-rich region of the water–acetone and water–hexamethyl phosphoric triamide mixed solvents have been measured at 25°C using a precise calorimetry system. The enthalpies of electrolyte solutions at infinite dilution were calculated using the Debye–Hückel theory. The enthalpies of solute transfer from water to the mixtures with acetone and hexamethyl phosphoric triamide were calculated. The enthalpy coefficients of solute–pair interactions with hexamethyl phosphoric triamide and acetone in aqueous solution were obtained using the McMillan–Mayer formalism. The values obtained were compared with those for other organic cosolvents. It was found that in aqueous solution the solutes show a strong tendency for hydrophobic interaction with cosolvent molecules, particularly in the water–hexamethyl phosphoric triamide system. 相似文献
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Anastasiya Agapova Dr. Henrik Junge Prof. Dr. Matthias Beller 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(40):9345-9349
A novel state-of-the-art bicatalytic system for hydrogen generation from aqueous methanol at low temperature and base concentration is described. Applying two molecularly defined ruthenium complexes A and B3 for methanol dehydrogenation at the same time under the same conditions, a synergistic effect is observed. This behavior is explained by the increase of the dehydrogenation of formic acid, which is formed as an intermediate, by the second catalyst B3 . 相似文献
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Oleshchuk Alena L. Karbainova Anastasiya A. Krivoruchko Tatyana N. Shulgau Zarina T. Seilkhanov Tulegen M. Kulakov Ivan V. 《Chemistry of Heterocyclic Compounds》2019,55(1):47-51
Chemistry of Heterocyclic Compounds - Aldol-crotonic condensation reactions of 3,5-diacetyl-2,6-dimethylpyridine with various aldehydes were used to synthesize bisazachalcone derivatives, which... 相似文献
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The synthesis of mono-, di- and trimethoxyphenyl bromopyridines using the dibromomalononitrile-potassium bromide complex as a mild bromination and oxidation reagent is described. 相似文献