2021年《中国学术期刊影响因子年报》发布——《地球学报》复合影响因子2.362     

《地球学报》编辑部 《地球学报》2022,43(1):125-126

由中国学术文献国际评价研究中心、清华大学图书馆研制, 《中国学术期刊(光盘版)》电子杂志社有限公司出版的《中国学术期刊影响因子年报(自然科学与工程技术)(2021 年版)》(简称《年报》)于 2021 年9月正式对外发布.  相似文献   

年度地震预报能力的科学评价   总被引：17，自引：0，他引：17       下载免费PDF全文

张国民  刘杰  石耀霖 《地震学报》2002,24(5):525-532

首先简单介绍了我国地震预报的科学思路，分析了地震预报能力评价中遇到的各种问题；在此基础上应用Ｒ值评分方法，讨论了1990～2000年我国年度地震危险区预测的实际效能，并对当前地震预报能力作了评述．   相似文献   

THE COMBINATORY METHOD FOR DETERMINATION OF THE TURBULENT FLUXES AND UNIVERSAL FUNCTIONS IN THE SURFACE LAYER          下载免费PDF全文

胡隐樵  奇跃进 《Acta Meteorologica Sinica》1993,(1)

A combinatory method of determining the turbulent fluxes in the surface layer has been developed and their generalrepresentations have been thus obtained.The universal functions of the (M-O) similarity in the surface layer can be de-termined by the method.The results calculated by using the ITCE's data indicate that the method is feasible.  相似文献   

高压下滑石的脱水实验研究   总被引：5，自引：0，他引：5  

谢鸿森  徐惠刚  彭文世  张月明 《矿物学报》1987,(2)

本实验由等化学计量的混合氧化物在高温高压下合成滑石之后,使温度继续升高,同时测定了不同压力下滑石的脱水温度、获得了合成滑石的脱水温度与压力的线性关系式: T_A(℃)=431.4+5.3P(k bar)。 此外,在30k bar和约900℃条件下,用Mg/Si比为1(原子比)的混合氧化物合成了三个含水镁硅酸盐新矿物相A,B,C。这三个相的红外光谱比滑石多886cm~(-1)和614cm~(-1)两个吸收峰,而且它的水区与滑石的水区有很大差别。  相似文献   

透闪石,滑石拓扑定向反应—龙溪软玉的电子衍射研究     

王春云  任国浩 《矿物学报》1989,9(4):315-321

通过对龙溪软玉中矿物纤维所进行的电子衍射研究,发现了透闪石针状晶体中存在众多(010)多链层错,透闪石和滑石以(010)为晶界面形成连生,以及滑石晶体呈纤维状存在;探讨了透闪石退变质为滑石的反应运动学和反应动力学机制;提出了拓扑定向反应系列的理论。  相似文献   

热烈庆祝中国地质学会成立六十周年          下载免费PDF全文

中国科学院地质研究所 《地质科学》1982,(2):123-124

在中国地质学会成立六十周年的喜庆日子里,中国科学院地质研究所谨向中国地质学会致以热烈的祝贺,谨向全国广大地质勘测、教学和科研工作者致以热烈的祝贺和亲切的慰问。  相似文献   

力克艰险奋进不滞——贺崔克信教授八十寿辰   总被引：1，自引：0，他引：1       下载免费PDF全文

中国科学院地质研究所 《地质科学》1989,(4):305-307

崔克信教授1909年7月出生于河北省井陉县库隆峰村一个贫苦农民家庭。1923年考入河北宣化第五师范学校,毕业后考入北京大学预科,两年后选入地质系学习,1935年毕业。1935年9月至1939年10月考入前经济部地质调查所任练习员、技佐。1939年11月至1940年12月任西康金矿局副工程师。  相似文献   

钾长石的热释光特征   总被引：1，自引：0，他引：1  

李虎侯  卢良才 《矿物学报》1989,9(1):82-88

本文根据不同产状和不同种类的10块钾长石标本的热释光特性分析表明,钾长石的热释光特性不仅取决于矿物晶体的产状和化学成分。而主要还取决于晶体精细结构的特征。钾长石的热释光特性既有差异又存在许多共性,它们存在共同的高温区热释光峰,矿物自身的内辐射场恒定,同时对β辐射的热释光响应敏灵度很高,对阳光的敏感度也很高,这几点共性正是钾长石可以作为热释光断代的基础。  相似文献   

Characteristics of a Short-Term and Imminent Earthquake Precursor Field in the Northern Part of North China and Numerical Simulation of Source Process     

Zhang Guomin  Shi Yaolin  and Zhang YongxianCenter for Analysis  Prediction  SSB  Beijing  P.R. China Graduate School  Academia Sinica  Beijing  P.R. China 《中国地震研究》1996,(2)

According to studies of more than 20 earthquakes with MS≥5.0 in North China, seven features of the short-term and imminent earthquake precursors have been summarized in this paper. At the same time, taking the short-term and imminent earthquake stage as the physical process of a source's medium softening and fault creep, we calculated temporal variation of mean stress, maximum shear stress, body strain, and pore pressure in some certain points (supposed stations) in the source area and its adjacent area by using an anisotropic and nonlinear source model and a finite element method. According to an analysis of these theoretical curves, we conclude that the short-term and imminent earthquake precursors have such characteristics as complex shapes, exponential growth of the precursor number with tune, and precursors' migration from the outside area to the source area, which to a certain extent reveal the cause of the characteristics of the short-term and imminent earthquake precursor field.  相似文献   

Calcite Dissolution in Deionized Water from 50°C to 250°C at 10 MPa: Rate Equation and Reaction Order     

GONG Qingjie  DENG Jun  WANG Qingfei  YANG Liqiang  SHE Min 《《地质学报》英文版》2008,82(5):994-1001

Carbonate minerals and water （or geofluids） reactions are important for modeling of geochemical processes and have received considerable attention over the past decades. The calcite dissolution rates from 50℃ to 250℃ at 10 MPa in deionized water with a flow rate varying from 0.2 to 5 mL/min were experimentally measured in a continuous flow column pressure vessel reactor. The dissolution began near the equilibrium with c/ceq 〉 0.3 and finally reached the equilibrium at 100℃-250℃, so the corresponding solubility was also determined as 1.87, 2.02, 2.02 and 1.88×10^-4.mol/L at 100℃, 150℃, 200℃ and 250℃ respectively, which was first increasing and then switching to decreasing with temperature and the maximum value might occur between 150℃ and 200℃. The experimental dissolution rate not only increased with temperature, but also had a rapid increase between 150℃ and 200℃ at a constant flow rate of 4 mL/min. The measured dissolution rates can be described using rate equations of R = k（1-c/ceq）n or R = kc-n. In these equations the reaction order n changed with temperature, which indicates that n was a variable rather than a constant, and the activation energy was 13.4 kJ/mol calculated with R = k（1-c/ceq）n or 18.0 kJ/mol with R = kc^-n, which is a little lower than the surface controlled values. The varied reaction order and lower activation energy indicates that calcite dissolution in this study is a complex interplay of diffusion controlled and surface controlled processes.  相似文献