Применение плутоний-содержащего топлива в реакторе ВВЭР

Расчет нейтронно–физических параметров активной зоны ядерного водо–водяного реактора, оптимизация топливной композиции для реактора ВВЭР–1000, провести расчет нейтронно–физических параметров активной зоны ядерного водо–водяного реактора.Сalculate the neutron-physical parameters of the core of a nuclear water-water reactor, optimize the fuel composition for the VVER-1000 reactor, and calculate the neutron-physical parameters of the core of a nuclear water-water reactor

Nuclear-physical methods of analysis using spectrometric radiation sources

To analyze the nuclear-physical methods of elemental composition and distribution of impurities by the method of Rutherford backscattering, the 238Pu source was used as the source of ionizing radiation. It was shown that in the absence of an accelerator this method is promising, since it allows one to monitor the composition and distribution of elements during technological processes

Selbstorganisation von Helicaten und molekularen Tetraedern

In this research hierarchical multi component self-assembly processes were investigated. The two ligands 2,3-dihydroxybenzaldehyde and 2,3-dihydroxyacetophenone were used for the multistep self-assembly of helicate-type dinuclear titanium(IV) or gallium(III) complexes in the presence of lithium ions. Further more, coordination studies with linear dicatechol diimine ligands, which possess due to the variation of the spacer different geometrical and electronical properties, were made. An enantiomerically pure dinuclear triple-stranded titanium(IV) helicate is formed from a dicatechol diimine ligand with an (R,R)-1,2-diaminocyclohexane spacer and its stereochemical features were elucidated by experimental and theoretical methods. By the complexation of a ligand which possesses C2h symmetry in its idealized structure with titanium(IV), homochiral helicates were diastereoselectively formed. On the other hand a ligand with idealized C2v symmetry leads with surprisingly high selectivity to the formation of the heterochiral meso-helicate. It could be shown, that a rigid connector transfers the stereochemical information of the first complex unit to a stereo-controlling unit, that is located at a distance of about 1 nm from the complex moiety. The small central unit influences the stereochemistry at the second titanium(IV) triscatecholate complex, which again is located 1 nm away. Thus, the stereochemical information is transferred over a distance of nearly 2 nm. Further on, the synthesis of linear ligands with a 2,2’-bipyridine and a dicatechol-unit with different binding sites were described. Thereby the 5,5’-diamino-2,2’-bipyridine was transformed into the imine- or amide-bridged dicatechol-bipyridine ligands. Coordination studies have shown, that it’s possible to selectively choose one of the binding sites by the choice of appropriate metal-ions. A series of triscatechols with an idealized axis of C3-symmetrie were synthesized. Hereby amide, imine or direct bonds are introduced as linkage between the catechol units and various C3-symmetric backbones. Their metal complexes with Ti(IV)ions were investigated. For the first time we succeeded to obtain a molecular tetrahedron with four Ti(IV)ions, which was big enough to bind guests in its interior. It could be shown, that the use of a flexible triscatecholate ligand with a C3-symmetrie leads to a dynamic combinatorial library. The dynamic library of complexes is formed in DMF in the presence of potassium cations. From this library three different coordination compounds can be selected by additi on of an appropriate template, by crystallization, or by equilibration of the mixture in DMSO

За кадры. 1938. № 28 (219)

За дальнейший подъем в работе профсоюзовО росте партии / Ал. Ш.Агитационная работа на 10-м участке / А. С.Приветствуем типовый устав высшей школы / В. Бородин [и др.]Комсомол пополняется передовой молодежью / Л-овДоска почета имени 20-летия ВЛКСМВыполняют обязательство / А. ФедоренкоРазвернуть социалистическое соревнование между группами / ЗаринПочему закрыт медицинский пункт? / А. Ф.Сделать газету образцовойО проведении выборов руководящих комсомольских органов. Постановление ЦК ВЛКСМИнструкции о проведении выборов руководящих комсомольских органовПривлечь к ответственности беззаботных руководителейСкоро-ли будет наведен порядок в общежитии? / ТубольцевРасписание составлено плохо / МамаеваЛюбители волокитыЕдиный календарный план работы организаций Томского индустриального института / МамаеваО работе информационно - библиографического отдела / В. ЛетуновШахматы / Л. Постнико