太阳射电辐射的自调制模型

本文采用几何光学近似，研究在日冕条件下，沿着磁场传播的电磁波产生非线性自调制不稳定性的可能．发现只有分米波和米波段的射电爆发，可以在日冕外层产生纵向和横向的自调制不稳定性．而在其它波段，如光学、X射线和高频电磁波，则不会产生这样的非线性不稳定性过程．由纵向自调制不稳定性产生的精细结构具有包络孤波的形状．     

SELENIUM REQUIREMENT OF SHRIMP PENAEUS CHINENSIS

Penaeus chinensis were reared in fibreglass tanks for the study of their selenium requirements. The shrimp were fed semipurified diets containing graded levels of selenium, and weight gains, activities of glutathione peroxidase (GSH-Px) and selenium contents in muscle and hepatopancreas were determined. Weight gain and GSH-Px activity were the highest when the shrimp were fed diet containing 20 mg/kg selenium; Good linear correlation was found between GSH-Px activities and selenium contents in the diets, and the number of healthy shrimp. The experiment showed that 20 mg/kg selenium in the diet is optimal for the shrimp and that GSH-Px activity can be an important biochemical index of the selenium nutrition status of the animal.     

PC微机与宇宙微机在我院联机成功

IBM—PC及兼容机与宇宙68000超级微机通讯在我院电算站已经研制调试成功,现已进入用户使用阶段。宇宙68000超级微机是我院1985年从美国康富公司引进的16位计算机,配上68020 CPU之后,其计算速度大大加快。该微机属多用户系统,外部设备齐全,在我院的教学和科研中发挥了相当大的作用。但是,因为该计算机并非我国当前的普及型计算机,在软件交流和资源共享方面受到局限。为了解决这一难题,并充分利用宇宙机和IBM—PC机各自的优点,达到相互补充相得益彰的目的,我们开发了IBM—PC及兼容机与宇宙68000的通讯工作。     

鹤壁发现新型二氧化碳气藏

本刊讯河南省鹤壁市在一地热井勘探中,首次发现了水溶性二氧化碳气藏.专家们说,在此以前,我国的江苏、广东、山东、吉林曾发现数处油气型二氧化碳,而此类水溶型二氧化碳气藏尚未见报道.