高校财务风险的防范

高校财务风险是客观存在的，正确认识和有效控制高校财务风险，是高校财务管理中面临的重要问题，也是保证高校健康持续发展的关键。防范高校财务风险应针对成因．权衡风险与收益之间的关系，做出在期望收益下风险最小、在风险一定下收益最大的决策。     

STUDY ON THE DISTRIBUTION OF SELENIUM AND OTHER ELEMENTS IN CORN SAMPLES BY NAA AND BIOCHEMICAL TECHNIQUE

Biochemical technique was used to separate three kinds of proteins (albumin, globulin and gliadin) in corn samples froin high selenium areas and normal areas in Erxi autonomous region of Hubei Province, China. The contents of Se and other elements in these proteins were determined by neutron activation analysis (NAA). The results show that Se is enriched in corn proteins at high selenium area, while Cu, Al, Mn, V and Cl are also enriched in varying degrees.     

混凝土、粘土对锆的吸附行为研究

放射性固体废物的处置已成为世界各国密切关心,也是亟待解决的一个问题。1980年美国Erdal等就粘土对裂变产物Ce,Sr,Ba,Eu,U,Am等核素的吸附情况进行了研究。1985年瑞典Torstenfel等对Sr,Tc,I,Ce,Th,U,Np,Pu,Am等核素在粘土中的迁移、扩散情况作了探讨。英国、芬兰、瑞典均对混凝土对多种核素的吸附和扩散作用进行过研究。白庆中等和庄慧娥等对放射性核素Sr,Cs在地质介质中的吸附和迁移规律也进行了研究。     

NAA OF Se WITH A GAMMA—GAMMA COINCIDENCE AND COMPTON SUPPRESSION SYSTEM

The paper describes a method of selenium determination by neutron activation analysis using gamma-gamma coincidence spectrometer with Compton suppression. The analysis results of some standard reference material from NBS or IAEA are reported. The differences between our data and reported values are discussed.     

MULTI—ELEMENT DETERMINATION OF SOIL SOLUTION BY INAA

One factor of influencing crop growth is the effective elemental contents, especially trace elements, under the circumstances of the same concentrations of N, P and K in soil. In order to obtain the data of effective elemental contents in soil, a novel method was introduced. In this method, soil solution was extracted by a squeezer. The concentrations of elements in soil solution were determined by INAA. Study on the compositions and the contents of elements in soil solution will provide information on making a suitable soil environment for plant growth and for rational and economical manure.