从太空遥瞻东方明珠——香港     

戴昌达  唐伶俐  寇连群  章文毅 《地球信息科学学报》1997,(2):4-7

引言香港是一颗镶嵌在中华巨龙口上的明珠。它被英帝国强行掳去百余年之后,将在1997年7月1日这个光辉的日子回归祖国,海内外每一个有骨气、有良知的炎黄子孙无不为之欢欣鼓舞,扬眉吐气,并关心着她今后的繁荣稳定。  相似文献   

A study of the magnetically sensitive line FeI λ5324.191     

Jin Jie-hai  Ye Shi-hui 《Chinese Astronomy and Astrophysics》1983,7(4):277-279

For the spectral line FeI λ5324.191, we solve numerically the Unno equations to get the profiles of the Stokes parameters, and found that it has a large magnetic intensification and is not excessively temperature-sensitive. We conclude that it is proper to use this line as the working line of video-magnetic graphs.  相似文献   

On the determination of the earth''s rotation using the McDonald lunar laser ranging data of 1971.6 – 1979.0     

Jin Wen-jing 《Chinese Astronomy and Astrophysics》1982,6(4):347-350

Using 1658 normal points of the McDonald lunar ranging data in the period 1971.6–1979.0, I calculated the Earth's rotation curve, and found an offset of −330 × 10⁻¹⁰ for UT₁ – UTC. The difference between the UT₁ values given by the lunar data and BIH is 3.6 ms. This difference and the standard error of single determinations increase with increasing interval length used in the data reduction. This is shown to be due to the neglect of the secular term in UT₁-UTC. It appears that an interval length of 2 days is suitable when calculating the Earth's rotation.  相似文献   

超大型矿床锡矿山锑矿成矿地质条件研究     

靳西祥 《湖南地质》1993,12(4):252-256,280

锡矿山锑矿属世界性的超大型矿床,它赋存在一个独特的构造抬升块中。表层褶皱是重要的控矿构造,基底断裂为主要导矿构造;矿田出露地层水源补给条件较好,是良好的供卤环境,佘田桥组中段为理想的赋矿岩系;硅化岩是锑矿化有利的寄主岩石;成矿物质,来源于矿田深部古水热活动区的前泥盆系;隐伏酸性岩体是古水热活动/循环的理想热源。锡矿山锑矿,是形成于古水热活动区的典型矿床。  相似文献   

雷电滤波器     

金能均 《东北地震研究》1992,(2)

本文叙述了两种雷电滤波器的工作原理及其使用方法。  相似文献   

The hydrodynamical characteristics of nearshore waters and the discharging process of mud flats— A case study of the mud flats near Lianyungang,China     

Yu Zhiying  Zhang Yong  Chen Dechang  Jin Liu 《中国海洋湖沼学报》1987,5(2):97-108

It is apparent that there is a difference between mud coasts and sand coasts in such aspects as sediment components, hydrodynamics of nearshore waters, and the formative process in configuration, and profile. The intensity distribution of waves affecting the mud flats in Lianyungang, and the conditions determining tidal water levels, are discussed in this paper. A mathematical model which describes the erosion process of mud flats has been derived on the basis of the results of tests for the mud process in seawater. The model is satisfactory for the actual mud flat profile change in Lianyungang with artificial mud discharges.  相似文献   

太阳射电爆发中Spike辐射的准周期振荡     

金声震  李小聪 《中国天文和天体物理学报》1989,(2)

本文介绍了在1981年5月16日微波大爆发中毫秒级时间轮廓Spike辐射中发生的准周期振荡现象。这种准周期振荡可能与日面活动区磁杯中的阿尔芬波运动有关,由此我们可以得到爆发源区一些基本物理条件。最后对于准周期振荡现象对Spike辐射的作用和影响作了简单的讨论。  相似文献   

An experimental study on variation of <Emphasis Type="Italic">b</Emphasis> value during deformation of rock samples with different structural models     

Chen Shun-yun  Liu Li-qiang  Ma Sheng-li  Ma Jin 《地震科学（英文版）》2005,18(3):338-344

A preliminary study of b value of rocks with two kinds of structural models has been made on the base of a new acoustic emission recording system. It shows that b value of the sample decreases obviously when the sample with compressive en echelon faults changes into a tensile one after interchange occurs between stress axis σ ₁ and σ ₂. A similar experiment is observed when the sample with tensile en echelon faults changes into that with a bend fault after two segments of the en echelon fault linking up. These facts indicate that the variation of b value may contain the information of the regional dominant structural model. Therefore, b-value analyses could be a new method for studying regional dominant structural models.  相似文献   

湖南有色金属生产矿山扩大接替资源的对策     

戴塔根 《地质通报》2005,(Z1)

湖南省境内有色金属矿产十分丰富,享有“有色金属之乡”的美誉,但经过多年的开采,90%以上的矿山都面临储量危机的困难,而找矿难度日益增大,常规的找矿技术路线已很难打开找矿效果不佳的局面。因此,在找矿预测过程中,必须以新的理论为指导,采用新的思路,从新的成矿与控矿因素、新的矿床成因类型与成矿模式入手,结合有效的常规手段与新技术,进行系统而科学的研究,并深入分析前人已有成果和投入大量现场调查研究工作,才有可能实现储量危机矿山找矿预测的突破。  相似文献   

中国人口迁移的区域差异与流场特征   总被引：40，自引：4，他引：36  

丁金宏  刘振宇  程丹明  刘瑾  邹建平 《地理学报》2005,15(1):106-114

通过2000年人口普查省际迁移数据的分析,揭示了当代中国人口迁移的区域分异性,以及不同原因的流场新模式。研究发现,中国人口迁移进入高活性、高能力的新阶段;东中西部人口迁移的不平衡性不断加剧,“中部塌陷”不仅是经济意义上的,而且也是社会意义上的;人口省际迁移的辐合流场与辐散流场在进一步发展,珠江三角洲是最大的迁移辐合中心;东北与山东的对流渐趋消失,西北取代东北成为非沿海区域新的人口引力中心;以秦岭-淮河线东段和黑河-腾冲线南段为界,人口迁移分裂为东南和西北两大“流域”。就业迁移的优势程度在进一步加大,市场取代计划成为人口和人才流动的第一动力;婚姻迁移的主流方向是西南贫困山区指向华东农村,形成了西南“喀斯特新娘输出区”。  相似文献