摘要:

The theoretical models for the treatment of the kinetic isotope effect of proton-transfer reactions (tunneling, Marcus and quantum-statistical mechanical model) are described. Scope and limits of these models are discussed with respect to intermolecular interaction, free energy relations, temperature, solvent and pressure dependence, and ultrafast protontransfer.

ISSN:0021-1915    

DOI:10.1080/10256018608623605

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

There is given a review on the level of astatine chemistry in oxydation state +1. According to the position of astatine in the periodic system At(I) has “metallic” properties. They may be seen in the existence of similar changed cation At(0)+in acid water solutions and in complex formation reactions with halogenides

ISSN:0021-1915    

DOI:10.1080/10256018608623606

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The spatial distribution of Cr deposited on metallic surfaces at concentrations of about 1016at/cm2was examined by detecting the radiation components emitted in the51Cr decay. The autoradiography revealed a non-homogeneous Cr covering. Combined Auger electron and X-ray spectroscopies yielded information on the Cr concentration, especially in the 2 nm thick surface layer. This concentration was found to depend strongly on the chromatation procedure applied. The influence of multiple vacancies on the LMM Auger spectrum of vanadium was investigated theoretically.

ISSN:0021-1915    

DOI:10.1080/10256018608623607

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Glucose and Lactose molecules have been prepared and recrystallized from bidistilled water. Extensive measurements have been carried out on these materials in the solid state comprising infrared; electronic absorption spectra before and after exposure to an absorbed energetic γ-ray dose. These materials were chosen as representatives of different types of sugars including mono- and disaccharides. They have hydrogen bonding of variant origins. The relative strength of the cyclic structures and the magnitude of γ-radiation damage were evaluated in each case. Gamma radiotic oxidation mechanism was established for both mono- and disaccharides investigated. A correlation between γ-radiation damage radiotic and relative strength of cyclic structures was put forward and established for the first time.

ISSN:0021-1915    

DOI:10.1080/10256018608623608

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The effects of gamma irradiation have been extensively investigated by stress-strain measurements in the temperature range from 300 K up to 475 K for Al–Fe and Al–Si alloys. Doping of small concentrations of 0.0005–0.0030 at.% Fe and 0.01–0.37 at. %Si, in Al-matrix caused a decrease in the work hardening coefficient K, yield stress σyand fracture stress σf, while the stress-strain parameters observed were increased after the gamma irradiation process. The decrease of stress-strain parameters with increasing both temperature and proportion of alloying elements were attributed to the migration of vacancy-atom piars in the Al-matrix. After gamma irradiation the increase of the stress-strain parameters was highly attributed to atomic displacements and the interaction of dislocations formed by irradiation process with Si- and Fe-vacancy pairs.

ISSN:0021-1915    

DOI:10.1080/10256018608623609

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Differences between transfer coefficients of vegetative and generative plant organs in the soil-plant-system have been find out. No differences were found between the two salts of strontium – nitrate and chloride – applied to the useful plants which were investigated. The discrimination factors show higher values for the nodes in comparison to the leaves of spinach and to the pea pods, i.e. to the aboveground parts of the plant.

ISSN:0021-1915    

DOI:10.1080/10256018608623610

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Starting from the sources of man-made radiation exposure of the population of the GDR and the environmental monitoring programmes derived therefrom, measured values, relevant to radiation exposure, and essential measuring activities are presented, using the environmental monitoring of a nuclear facility as an example.

ISSN:0021-1915    

DOI:10.1080/10256018608623611

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018608623612

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018608623613

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor