美国人口迁移的理论、模式及经验研究

近十五年来,美国国内移民发生了根本性变化。1970年以前,西部地区人口净移入数一直保持第一位。1970年以后,南部人口净移入数已是西部的两倍。此外,大城市地区的人口增长率明显下降。部分原因是由于大城市地区的城市中心区人口减少了,并且前几年郊区人口激增的势头也明显缓和了。     

海洋中的电磁研究

讨论了海洋中电磁研究的结果。特别注意苏联境内的研究结果.     

雅鲁藏布中新生代深水沉积盆地形成和演化(Ⅲ)——喜马拉雅被动大陆边缘构造沉降分析

喜马拉雅特提斯中、新生代属印度板块北部被动大陆边缘。对充填这个被动大陆边缘的沉积物用“反剥法”(backstrippiog)进行研究,恢复了从被动大陆边缘到前陆盆地的抓降史。对分离出的盆地构造沉降曲线与McKenzie模式图版进行对比相关性分析,判断认为被动大陆边缘成熟期主要为热耗散沉降,前陆盆地时逆冲推覆动力为主要影响因素。     

Homochirality as the signature of life: the SETH Cigar

A characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. It is therefore suggested that a search for extra-terrestrial life can be approached as a Search for Extra-Terrestrial Homochirality (SETH). A novel miniaturized space polarimeter, called the SETH Cigar, is described which could he used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. It is believed that homochirality will be found in the subsurface layers on Mars as a relic of extinct life.