Morphological differentiation characteristics and classification criteria of lunar surface relief amplitude     

DENG Jiayin  CHENG Weiming  LIU Qiangyi  JIAO Yimeng  LIU Jianzhong 《地理学报(英文版)》2022,32(11):2365-2378

Lunar landforms are the results of geological and geomorphic processes on the lunar surface. It is very important to identify the types of lunar landforms. Geomorphology is the scientific study of the origin and evolution of morphological landforms on planetary surfaces. Elevation and relief amplitude are the most commonly used geomorphic indices in geomorphological classification studies. Previous studies have determined the elevation classification criteria of the lunar surface. In this paper,...  相似文献   

我国南极陨石研究的新进展   总被引：5，自引：0，他引：5  

缪秉魁  欧阳自远  林杨挺  肖龙  黄定华  何琦 《地质科技情报》2008,27(1):13-19,30

近年来,因在南极发现了大量的陨石样品,我国天体化学和陨石学研究得到了快速发展,并取得了一系列可喜的成果,如:①在南极已收集了近万块南极陨石样品,使我国已成为南极陨石拥有大国;②大量的陨石发现和研究成果表明格罗夫山地区为我国发现的新的陨石富集区,填补了我国在南极陨石领域的空白;③发现了许多我国奇缺的陨石类型,如火星陨石、CR型碳质球粒陨石等;④开展了较深入的CAI研究等.这些都将为我国天体化学和比较行星学的发展展示广阔的前景.提出了一些南极陨石研究工作中存在的问题和今后的工作方向.  相似文献   

Rr CrB and Algol – The First and Last Star in Zdeněk Kopal’s Life with Binaries     

Martin Šolc 《Astrophysics and Space Science》2005,296(1-4):43-54

Several important turning points appeared in the personal life and scientific career of Zdeněk Kopal, every time, when he entered a new field of research. Four particular periods of his life will be commented in the present paper: the studies in Prague and early observations in the variable star programme of the Czech Astronomical Society; the first lectures on close binaries at Harvard; the intermezzo of lunar research; and the last period after 1989, when Zdeněk Kopal returned several times to Prague University.  相似文献   

Lunar and solar daily variations of equivalent slab thickness at Delhi   总被引：1，自引：0，他引：1  

P. K. Bhuyan  T. R. Tyagi 《Geophysical Journal International》1987,88(2):487-493

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月球辐射照度模型比对及地基对月观测验证     

张璐  张鹏  胡秀清  陈林  王阳  王威 《遥感学报》2017,21(6):864-870

月球是除太阳外对地张角最大的天体,反射率稳定性为10–8每年,适合用于遥感卫星的辐射定标、夜间地基大气遥感和夜间卫星遥感,但月球辐射照度模型的精度束缚了上述应用的发展。为检验现有ROLO(RObotic Lunar Observatory)和MT2009(Miller-Turner 2009)地基整盘月球辐射照度模型的精度,国家卫星气象中心于2015年底至2016年初在云南丽江组织了3个月的地基对月观测,使用高光谱月球成像光谱仪获取了399.00—1060.00 nm连续光谱的月球辐射照度。基于整盘月球辐射照度模型,利用丽江地基对月观测试验资料,对比模型与模型、模型与丽江地基观测月球辐射照度。结果表明:(1)MT2009与ROLO模型在短波红外谱段的差异明显大于可见光谱段;(2)地基观测高光谱月球辐射照度结果与ROLO模型更接近,但是可见光波段比ROLO模型辐射照度平均小5.86%左右。为探究差异产生的主要来源,对结果还进行了进一步的分析和讨论,以期为今后月球辐射模型的改进和夜间微光遥感研究提供经验和依据。  相似文献   

海洋和电离层发电机对佘山台L的影响   总被引：1，自引：0，他引：1  

康国发 《地震地磁观测与研究》1992,13(4):46-50

本文在文献[1]的研究基础上进一步分析海洋和电离层发电机对佘山台L的影响。资料分别按月、季节和年以及太阳活动性分组进行的细致分析,结果表明海洋发电机对Z分量的L有一稳定的影响,L的季节变化主要起源于电离层发电机。L的海洋部分不随太阳活动性改变,太阳活动对L的影响比对S的小。  相似文献   

Critical remarks on the use of medieval eclipse records for the determination of long-term changes in the Earth's rotation     

W. Dalmau 《Surveys in Geophysics》1997,18(2-3):213-223

The use of some Arabic medieval solar and lunar eclipse records for the determination of secular changes in the Earth's rotation is critically reviewed. The published results derived from these data suggest a non-uniform decrease in the Earth's rotation rate over the last 27 cy. There is, however, up to this day no sound physical explanation for the deduced non-tidal oscillations, with an apparent period of about 1500 yr and a semi-amplitude of some 4 ms in the l.o.d., which overlayed to a constant secular tidal change in the Earth's rotation rate produce a net non-uniform deceleration of the Earth's rotation. In this paper we discuss a set of observations, which were executed by professional Arabic astronomers. We show by our analysis the way in which the non-uniform deceleration of the Earth's rotation was constructed. A correct reading of the Arabic medieval observations shows that they do not contradict a secular constant decrease in the Earth's rotation rate of nearly -4.6 10-22 rad s-2. This value is in accordance with other similar ones derived from ancient eclipse records and from satellite tracking data.  相似文献   

An Innovative Approach to Meteorite Analysis by Laser‐Induced Breakdown Spectroscopy          下载免费PDF全文

Giorgio S. Senesi  Gioacchino Tempesta  Paola Manzari  Giovanna Agrosì 《Geostandards and Geoanalytical Research》2016,40(4):533-541

An innovative approach of double pulse laser‐induced breakdown spectroscopy (DP‐LIBS) coupled with optical microscopy was applied to the characterisation and quantitative analysis of the Agoudal iron meteorite in bulk sample and in petrographic thin section. Qualitative analysis identified the elements Ca, Co, Fe, Ga, Li and Ni in the thin section and the whole meteorite. Two different methods, calibration‐free LIBS and one‐point calibration LIBS, were used as complementary methodologies for quantitative LIBS analysis. The elemental composition data obtained by LIBS were in good agreement with the compositional analyses obtained by traditional methods generally applied for the analysis of meteorites, such as ICP‐MS and EDS‐SEM. Besides the recognised advantages of LIBS over traditional techniques, including versatility, minimal destructivity, lack of waste production, low operating costs, rapidity of analysis, availability of transportable or portable systems, etc., additional advantages of this technique in the analysis of meteorites are precision and accuracy, sensitivity to low atomic number elements such as Li and the capacity to detect and quantify Co contents that cannot be obtained by EDS‐SEM.  相似文献   

台湾海峡北口潮汐观测与分析     

杨顺良 《热带海洋学报》1997,(1)

介绍在台湾海峡北口中部水深约65m处进行临时验潮的方法和过程，并将其测验结果与台湾海峡东西两岸验潮站的资料进行了比较分析。结果显示：海峡北口中部海域与纬度较相近的海峡西岸平潭（东澳）站及东岸的淡水站相比，潮型基本一致，均为正规半日潮，在月赤纬大时，潮汐的日不等现象明显；潮差与西岸较接近，而明显大于东岸；潮时与西岸基本相同而早于东岸。  相似文献   

中国内蒙古白云鄂博Fe-Nb-REE矿床地质特征与陨石撞击成因   总被引：3，自引：0，他引：3  

姚德  张丽洁  ＷｉｌｔｓｈｉｒｅＪ  ＭａｌａｈｏｆｆＡ  业渝光 《海洋地质与第四纪地质》1998,(4)

中国内蒙古白云鄂博Ｆｅ－Ｎｂ－ＲＥＥ矿床由于其独特的矿床地质与矿物地球化学特征而明显有别于世界上其它绝大多数的Ｆｅ、Ｎｂ、ＲＥＥ矿床。本文提出该矿床是约１５００Ｍａ前一块富含ＲＥＥ、Ｎｂ的铁陨石撞击在华北地台北缘碳酸盐沉积陆架上形成的。现在矿床矿体中心的块状铁矿石更多地代表了陨石的成分,矿体外侧富含ＲＥＥ、Ｎｂ的环状白云岩是陨石撞击浅海碳酸盐沉积陆架释放的巨大能量使海水（含Ｍｇ）迅速受热溶解陨石中的ＲＥＥ、Ｎｂ等形成的含金属热液蚀变沉积成因方解石质碳酸盐沉积物的结果。块状铁矿石和环状白云岩之间矿物成分异常复杂、结晶颗粒十分细小的条带状、侵染状Ｆｅ－Ｎｂ－ＲＥＥ矿石组成的矿体则是撞击瞬间导致的由陨石（Ｆｅ、Ｎｂ、ＲＥＥ）、海水（Ｍｇ、Ｎａ、Ｋ等）和碳酸盐（含少量硅质夹层）（Ｃａ、Ｓｉ、Ａｌ等）组成的超高温、多组分、富水体系在快速冷却条件下反应生成的产物。撞击释放的巨大热能,在撞击体（陨石）下部相对不易释放,导致部分碳酸盐沉积物在富含ＲＥＥ、Ｎｂ、Ｍｇ等的热液参与下融熔,然后侵入到周围岩石裂隙形成矿区内众多的富含ＲＥＥ、Ｎｂ的白云岩脉。撞击的瞬间导致大量岩石、矿物碎屑、海水、蒸汽弥漫天空,同时引发巨大的海啸,然  相似文献