摘要:

After both an introduction into the basic problems of electron transfer reactions (“redox reactions”) and their interconnection with substitution reactions, and a description of the situation met by Henry Taube in the early fifties, are presented and discussed: the so-called labile and inert complexes considering the kinetics of ligand exchange; the outerandinner- spheremechanisnisandtheir impact on electron transfer as well as the restrictions caused by the Franck-Condon principle (through potential-energy diagrams); the Marcus model for the outer-sphere mechanism; the important historical studies on the activated bridged Taube complex and their mechanistic consequences (precursor, activated, successor complex); and bridged mixed-valence complexes with corresponding model conceptions elaborated by Hush for the intervalence transfer bands in the electron spectrum of these complexes.

ISSN:0021-1915    

DOI:10.1080/10256018508623500

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The importance of the isotope235U has been appreciated on occasion of the 50th anniversary of its dicovery. A short review of the history of the discovery is followed by explanations of the presence of235U in nature, of the possibility of its formation from other uranium isotopes and of the phenomenon of the natural fission reactor in the uranium deposit of Oklo (Gabon). Furthermore the role of235U in todays nuclear energetics has been explaned.

ISSN:0021-1915    

DOI:10.1080/10256018508623501

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

A comparison of spectra of uranylions in HCl- and dioxane-solutions leads to the conclusion, that dioxane increases complex formation. The investigation of these spectra has shown the occurance 'of two complex equilibria regarding the formation of chlorocomplexes beside any hydrolytic effects. The formation constants were determined. Measurements of conductance confirm the spectrophotometric derived equilibria. The replacement of water by dioxane in the inner solvation sphere, of uranylions can be excluded up to about 60% dioxane.

ISSN:0021-1915    

DOI:10.1080/10256018508623502

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

The specific activity of vickel catalysts promoted with alumina/chromia-mixtures for the isotopic exchange of deuterium between hydrogen and water vapour decreases to a great extent due to water condensation on its surface. To overcome this difficulty, it is essential to search for a catalyst of high activity in both liquid and vapour phases. The isotopic exchange reaction was used as a test reaction in the vapour phase, while the thermal decomposition of hydrogen peroxide was chosen as a simple test reaction in the liquid phase. Activity measurements in both liquid and vapour phases indicate that the catalyst composed of 85 mol% Ni/10 mol% Al2O3/5 mol% Cr2O3exihibits maximum activity on both phases.

ISSN:0021-1915    

DOI:10.1080/10256018508623503

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

摘要:

By utilization of methods of radiation processing and radiation technology in the pilot and industrial scale the irradiation facility including the shieldings is the factor, which influences the costs mostly. Description and evaluation of partial systems by means of dose rate distributions is one of the important fundamentals for an optimal design. The complex relations require the application of computer methods. The combined application of computer experiments and dosimetry within the bounds of evaluation of existing facilities is the basis for working out an adequate computing model. The use of the model opens some new possibilities for the design of gamma-irradiation facilities. Possibilities and advantages of this practice are demonstrated by means of some examples of utilization of the code D0SKMF2 for problems of the ZfI.

ISSN:0021-1915    

DOI:10.1080/10256018508623504

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623505

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623506

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623507

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623508

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018508623509

出版商:Taylor & Francis Group    

年代:1985

数据来源: Taylor