三门峡盆地第四纪古地理演变与古人类活动

三门峡盆地位居黄河中游,环境的演进与古人类的活动有着密切关系。早更新世,三门峡盆地为湖盆区,在盆边林缘地带发展了西侯度文化;中更新世,盆地内山前洪积扇面积扩大,湖盆缩小,扇前近水地带发展了匼河一丁村文化;晚更新世,湖水消失,黄河出现,黄土堆积的山麓与河谷两岸阶地上,发展了许家窑文化;全新世,大陆性季风明显,黄土丘陵与河谷阶地区发展了仰韶文化、龙山文化与现代人类社会历史。可见,盆地区古人类活动历史已长达200万年左右。而且,人类的发展迁徙与古地理环境的演进也是有着密切关系的。     

Spectroscopic Study of Natural Diamonds in China

It has become clear in recent years that the important substitutional impurities in diamond are nitrogen,hydrogen and boron(Bibby,D.M.,1982).The physical and chemical properties of diamond are determined by the content and form of occurence of nitrogen based on which diamonds are generally classified.The well-known experiments concerning the mutual transformation of the forms the origin of diamond.by Evans.T.Et al.(1982) have provided a theoretic basis for the origin of diamond.Since 1979,spectroscopic investigation of natural diamonds from different areas in china has been carried out using UV-visible and IR spectrophotometer,EPR and cathodoluminescence techniques.We have conducted the classification of natural cathodoluminescence techniques.We have conducted the classification of natural diamonds in China and studies on the forms of nitrogen and hydrogen,the radiation damage and their geological implications.Spectroscopic characteristics of natural diamonds in china and their geological implications are discussed in this paper.     

论常德市地质构造特征及其对城市规划建设的影响

本文采用大量实际资料,阐述了常德市的地质构造特征,从第四系及新构造运动的特点论述了常德市不同地段工程地质稳定性的差异,对该市灼规划建设布局和防震、防洪等方面提出了一些新的看法和建议。     

On the origin of the carat as the unit of weight for gemstones

The carat is the unit of weight for diamonds and other gemstones. It corresponds to the average weight of the seeds of a leguminous tree. What kind of tree is this? We have studied the samples from Ethiopia. Egypt, Cyprus and the United States. The tree is neither “Kuara” nor “Locust” (Robina pseudoacacia Linn.), but rather Carob (Ceratonia Siliqua). In Ethiopia, as called by local inhabitants, “Kuara” is a species of Erythrina—E. brucei rather thanE. abyssinica. As might be expected, using the seeds as a means of weighing an extremely valuable commodity is not very scientific. Before 1907, at various times and in various countries, there were at least twenty-three standards for the carat ranging from 187.00 mg to 215.990 mg. The metric carat equal to 200 mg was proposed in Paris in 1907. It was adopted in the United States on July 1, 1913 and now is the world-accepted standard. But in reality, the standard of the carat is still confused with respect to its usage throughout the world. This is why the author reiterates that the standard of the carat should be integrated with the metric system.     

中国东部中生代产铀火山岩的基本特征

产铀火山岩与非产铀火山岩存在岩石、岩石化学成分、微量元素及稀土元素的特征性差异;中国东部产铀火山洼地均形成于幔隆翼部重力高梯度带基底隆起构造环境,而火山洼地中铀的晚期主成矿作用,则以白垩纪拉张环境下贯入的中基性岩脉为先导,随后与之同步进行。     

火山地震的理论地震图计算方法

本文首先分析了不同类型火山地震的波形,提出了相应的震源模型.然后发展了计算层状介质理论地震图的部分分离变量—有限差分方法,其最重要的环节是引用了吸收边界条件,使计算工作得以简化.这种方法特别适用于火山地震的理论地震图计算.最后,本文给出了计算实例.     

东北地区高精度GPS定位试验初步结果

1990年8月至9月间,武汉测绘科技大学和黑龙江省测绘局合作,圆满完成了国家高精度GPS 空间定位网的东北地区一个环的GPS 测量试验工作。 该项试验取得了预期的效果。表明了国家高精度GPS 空间定位网初步设计的技术目标的可行性,并为该网的组织实施和作业调度提供了经检。通过试验,为发展完善了观测技术方案和外业数据检检方法,及全网的布测实施提供了必要的依据。