Cryogenic Stand for Testing Cryostats with Superconducting RF Resonators at 1.8 K

A separated K-meson complex is being designed at the Institute of High-Energy Physics. One of the main components is an rf separator consisting of two superconducting niobium resonators. A newly developed cryogenic-vacuum stand for testing resonators is described. The results of cryogenic–vacuum tests of the system for cryogenic support of the resonators at 1.8–4.2 K are presented.     

Radiation risk, health and quality of life: the medico-psychological and social-ecological aspects

Complexity and contradictoriness of the triplet life quality-health-risk gain particular acuity owing to the extensive and intensive nature of radiation and non-radiation risks in the modern technological society. Improvement of life standards issue new risks. Unavoidability of existing risks, emergence of new ones, and necessity of qualitative, first of all energetic, life maintenance come into conflict with the principles of ecological stability. The concept of life quality is in many respects irrational and in the future will largely hinge on traditions, ideological and religious maxims.     

Thermodynamic Characteristics of Uranyl Benzenesulfonate and p-Toluenesulfonate

The enthalpies of solution of anhydrous and hydrated uranyl benzenesulfonate (I) and p-toluenesulfonate II) in 4 M HCl were determined. The standard enthalpies of formation of I and II and their crystal hydrates from uranium trioxide, sulfonic acids, and water and enthalpies of water addition to anhydrous salts and lower hydrates of II were calculated. The enthalpy of addition of water molecule to II·H₂O is about half that of addition to II·3H₂O. With regard to all approximations in calculations, the enthalpy of formation of II from amorphous uranium trioxide and aqueous solution of the corresponding acid is by approximately 20 kJ mol^{- 1} more negative as compared to I. It was concluded that the electron-donor power of the p-toluenesulfonate ion is noticeably greater than that of the benzenesulfonate ion, which determines the difference in the properties of II and I.