Results of TV imaging of Phobos (Experiment VSK-Fregat)     

Avanesov G  Zhukov B  Ziman YA  Kostenko V  Kuzmin A  Murav'ev V  Fedotov V  Bonev B  Mishev D  Petkov D  Krumov A  Simeonov S  Boycheva V  Uzunov YU  Weide GG  Halmann D  Pössel W  Head J  Murchie S  Schkuratov YuG  Berghänel R  Danz M  Mangoldt T  Pihan U  Smith B 《Planetary and Space Science》1991,39(1-2):281-295

From February to March 1989 the Phobos 2 spacecraft took 37 TV images of Phobos at a distance of 190-1100 km. These images complement Mariner-9 and Viking data by providing higher-resolution coverage of a large region West of the crater Stickney (40-160 degrees W) and by providing disk-resolved measurements of surface brightness at a greater range of wavelengths and additional phase angles. These images have supported updated mapping and characterization of large craters and grooves, and have provided additional observations of craters' and grooves' bright rims. Variations in surface visible/near-infrared color ratio of almost a factor of 2 have been recognized; these variations appear to be associated with the ejecta of specific large impact craters. Updated determinations of satellite mass and volume allow calculation of a more accurate value of bulk density, 1.90 +/- 0.1 g cm-3. This is significantly lower than the density of meteoritic analogs to Phobos' surface, suggesting a porous interior perhaps containing interstitial ice.  相似文献   

Night drainage winds     

Dr. Z. Petkovšek  Dr. A. Hočevar 《Meteorology and Atmospheric Physics》1971,20(4):353-360

  相似文献   

鲁山棚沟金矿床包裹体特征及找矿意义     

张正伟  林潜龙  杨晓勇  刘德良 《河南国土资源》1997,(2)

棚沟金矿床赋存于华北古陆块南缘前寒武纪花岗岩中，在空间上受区域韧性剪切带中的燕山末期花岗斑岩控制。根据矿床地质特点判断属中低温热液型金矿。通过岩石矿物组合及包裹体组成、性质、同位素等测试，确定成矿物质来源于围岩，成矿流体来源于变质水且有岩浆水与雨水的混入。通过电子探针测定的岩矿组分，计算围岩成岩及变质温度，以及成矿温度、压力和沉淀条件，认为金矿床的成矿作用，主要表现为减压环境中的岩浆热液充填和交代蚀变，以及热液的泡腾作用。从找矿标志角度确定富ＣＯ２的泡腾包裹体群、液相高硫富ＨＣＯ－３、气相高ＣＯ２和高ＣＯ２／Ｈ２Ｏ比值等参数是寻找此类金矿的重要标志  相似文献   

COMPLETE LIST OF MEMBERS OF THE GEOLOGICAL SOCIETY OF CHINA. (SEPTEMBER 1926)     

Y.C.SUN   《《地质学报》英文版》1925,4(Z1):199-212

Important notice to members:- All members are earnestly requested to send to the Secretary of the Society any change of address. The  相似文献   

Mechanisms of landslides in over-consolidated clays and flysch     

Matjaž Mikoš  Ana Petkovšek  Bojan Majes 《Landslides》2009,6(4):367-371

In this report, we present the situation in Slovenia, Europe with regard to natural hazards, emphasizing land-sliding problems. Furthermore, we shortly present the University of Ljubljana and the Faculty of Civil and Geodetic Engineering as the new member of the ICL that was selected to be the World Center of Excellence on Landslide Risk Reduction for the period of 2008–2013 with the project entitled “Mechanisms of landslides in over-consolidated clays and flysch” in the Activity scale and targeted region as “National.” Some preliminary results of this project are shortly presented at the end.  相似文献   

Turbulent dissipation of cold air lake in a basin     

Z. Petkovšek 《Meteorology and Atmospheric Physics》1992,47(2-4):237-245

Summary Problems of turbulent dissipation of a cold air lake (CAL) and the inversion layer bordering CAL on the upper boundary are presented and studied with the compound model. In wintertime such cold air lakes can persist for days even if rather strong winds are blowing above them. The required conditions for CAL dissipation are removed processes of its formation or maintenance, as well as a sufficiently strong invasion of turbulence in the inversion layer from above down-wards. By this, the inversion layer at first becomes stronger and dissipation is stopped, until the increase of turbulent kinetic energy of the upper flow enables further dissipation. Such turbulent dissipation process is shown by the model for typical conditions and for different initial values of the relevent variables.With 6 Figures  相似文献   

Lifetimes of some excited states in the rare earths: La ii,Ce ii,Pr ii,Nd ii,Sm ii,Yb i,Yb ii,and Lu ii     

T. Andersen  O. Poulsen  P. S. Ramanujam  A. Petrakiev Petkov 《Solar physics》1975,44(2):257-267

Radiative lifetimes for excited states in La ii, Ce ii, Pr ii, Nd ii, Sm ii, Yb i, Yb ii, and Lu ii have been determined by means of the beam-foil technique or the zero-field level-crossing method. The lifetimes for La, Ce, Pr, Nd, Sm, and Yb are shorter than those computed by summing the transition probabilities of Corliss and Bozman by a factor of up to ~5. The large discrepancies between the abundance of La, Ce, Pr, Nd, and Sm in the solar photosphere and in meteorites are eliminated or greatly reduced if the abundance determinations of the solar photosphere are based upon the gf values of Corliss and Bozman, corrected for by the present lifetimes.  相似文献   

PALAEONTOLOGICAL NOTES     

章鸿釗 《地质学报》1925,4(2):128-135

In my former articles published in this Bulletin§ and in Science§§ (Chinese), I have attempted to show that the early possible date of using zinc in China can be traced since Han Dynasty (201 B. C.—200 A. D.), and  相似文献   

CORUNDUM OF PING SHAN DISTRICT, W. CHIHLI.     

Y.C.SUN   《《地质学报》英文版》1925,4(Z1):193-196

I. GEOLOGY AND TOPOGRAPHY OF THE CORUNDUM DISTRTOT. The corundum is found in Ping Shan Hsien (平山縣) which is located in the south-western part of Chihli. It connects with Chin Hsing  相似文献   

江西省“九五”期间1∶5万区调工作主要进展   总被引：1，自引：0，他引：1  

刘邦秀  李永明 《江西地质》2001,(3)

本文系统介绍了江西省“九五”期间1∶5万区调工作在变质岩及地层、侵入岩、地质构造、填图方法等方面的主要成果。  相似文献