建立在PC机上的区域化探数据库系统

建立在ＰＣ机上的区域化探数据库系统李松（辽宁有色地球物理勘查大队）一、系统设计的基本思想１．数据库系统的硬件运行环境为ＩＢＭＰＣ／ＸＴ机或兼容机和针式打印机。２．在中文状态下进行人机对话，给出必要的提示，便于用户使用。３．可以用多种方式录入数据，能够...     

厦门港真刺唇角水蚤的体长、体重和元素组成

本文利用1986年5月—1987年6月在厦门港海域采集的浮游生物样品,对该海域的真刺唇角水蚤的体长、体重和元素组成的季节变化及其影响因素进行了分析研究,并对其元素比率与生化组成的关系进行了探讨。     

真刺唇角水蚤对鱼卵和仔鱼的捕食

鱼类幼体的死亡常常被归因于食物的缺乏,实际上,以桡足类为主的浮游动物对鱼卵和仔鱼的捕食是其死亡的最主要原因之一,也是影响鱼类资源补充的主要因素;所以,研究桡足类对鱼卵和仔鱼的捕食不仅对海洋食物链研究而且对研究鱼类资源补充和产量的估算,也具有重要的意义。有关这方面的实验国内尚未见专门报道,本文为厦门港     

厦门港真刺唇角水蚤的生长率

本文以实验室培养为主,结合自然种群调查,观测厦门港真刺唇角水蚤各发育阶段体长、体重的增长状况,并研究了其生长率与温度、发育期的关系。     

Origin of the hydrocarbon component of carbonaceous chondrites: the star-meteorite connection

We report the results of an experiment that produced a residue which closely matches the hydrocarbon component of the Murchison carbonaceous chondrite. This experiment suggests that the parent material of the meteoritic component originated as polycyclic aromatic hydrocarbon species in carbon stars during their later stages of evolution. The experiments also indicate that the pathway from those formation sites to eventual incorporation into the meteorite parent body involved hydrogenation in a plasma in the solar nebula or in H II regions prior to the solar nebula. This model is consistent with what is known about the meteoritic hydrocarbon component including deuterium abundance, the observation of cosmic infrared emission bands best attributed to polycyclic aromatic hydrocarbon molecules, and the inherent stability of these molecules that allows their formation in stars and subsequent survival in the interstellar medium.     

Plasma processing of interstellar PAHs into solar system kerogen

Processes resulting in the formation of hydrocarbons of carbonaceous chondrites and the identity of the interstellar molecular precursors involved are an objective of investigations into the origin of the solar system and perhaps even life on earth. We have combined the resources and experience of an astronomer and physicists doing laboratory simulations with those of a chemical expert in the analysis of meteoritic hydrocarbons, in a project that investigated the conversion of polycyclic aromatic hydrocarbons (PAHs) formed in stellar atmospheres into alkanes found in meteorites. Plasma hydrogenation has been found in the University of Alabama at Birmingham Astrophysics Laboratory to produce from the precursor PAH naphthalene, a new material having an IR absorption spectrum (Lee, W. and Wdowiak, T.J., Astrophys. J. 417, L49-L51, 1993) remarkably similar to that obtained at Arizona State University of the benzene-methanol extract of the Murchison meteorite (Cronin, J.R. and Pizzarello, S., Geochim. Cosmochim. Acta 54, 2859-2868, 1990). There are astrophysical and meteoritic arguments for PAH species from extra-solar sources being incorporated into the solar nebula, where plasma hydrogenation is highly plausible. Conversion of PAHs into alkanes could also have occurred in the interstellar medium. The synthesis of laboratory analogs of meteoritic hydrocarbons through plasma hydrogenation of PAH species is underway, as is chemical analysis of those analogs. The objective is to clarify this heretofore uninvestigated process and to understand its role during the origin of the solar system as a mechanism of production of hydrocarbon species now found in meteorites. Results have been obtained in the form of time-of-flight spectroscopy and chemical analysis of the lab analog prepared from naphthalene.     

对几种1980系简捷坐标换带程序计算结果的分析

对几种计算简捷而精度又较高的1980系坐标换带计算程序分别进行一定数量的试算，现将试算、分析、比较情况介绍给同行们，供工作中参考。     

云南湖泊的水质及沉积物地球化学

云贵高原上的众多湖泊，其经济意义十分重要，1994年10月，对24个湖泊采集水样和沉积物，室内深入研究后提出每个湖泊化学、物理特性以及区域地质、人类活动对水质和沉积类型的影响。云南构造成因的深水湖泊的水质与浅水溶蚀湖盆有区别。一般来说，后者要比前者更具有高营养积聚，并显示出较敏感的湖滨扰动。即便如此，凡是有大型植物生长的浅水湖泊，其水体都呈低营养质特点。除了重硫酸钠型的程海外，其它湖泊均以Ca 2、Mg 2、HCO3-1离子为特征，可能是由周边区域地质环境及碳酸盐类岩层所决定。特殊的电导性和同位素δ18O呈正相关性表明：此为溶解物和18O均由蒸发作用引起的结果。滇东南大型洗水湖呈18O富态；小型深水湖泊18O呈消减态。降雨汇聚径流量显著多于自深水体的小型浅水湖中的18O也呈消减淡化。同位素证据表明：程海表面5m内的18O在减少，此为蒸发量增加、入湖汇流水体性质发生变化及多样性所致。地表冲刷是毁林、农耕、土壤侵蚀以及工业化等方面的结果。湖泊高丰度营养化物质表明：人类活动已严重影响水质。沉积物中低有机质是因为地表冲刷而使愈来愈多的非碳酸盐类和碎屑物组分混入的结果。需要由环境保护来加以控制，以平衡因经济活动而造成的生态感应和对水质的影响。     

台湾海峡浮游桡足类的分布

桡足类是海洋浮游生物的重要组成部分,不但种类多、数量大、分布广,而且是水域食物网中的一个重要环节,是许多经济鱼类特别是幼鱼的主要饵料,同时,有些桡足类还可作为海流或水团的指示种。因此,浮游桡足类的分布研究,在理论上和实践上都具有重要意义。关于台湾海峡的浮游桡足类,过去国内、外学者曾有一些零星报道,但尚缺乏系统的调查研究,主要有Giesbrecht(1889)、Mori(1932,1937)、Yamada(1933)、Tan(1970)、郑重等(1955,1965,1978,1979)、陈清潮等(1965,1974)、厦门大学生物系等(1960),以及闽南—台湾浅滩渔场调查(1975—1978)和福建省科委海洋组等的福建中、南部凋查(1961—1964);最近,还有黄加祺等(1981)的九龙江河口区的调查。