宇宙线μ子能谱及其应用          下载免费PDF全文

周大庄  周志文 《地球物理学报》1990,33(2):234-238

完成由两块大面积塑料闪烁体组成的粒子望远镜的研制,并测得合肥地区地面宇宙线μ子能谱.简要报道这台粒子望远镜的实际应用.  相似文献   

宇宙线μ子能谱及其应用     

周大庄  周志文  程纯杰  马福胜 《地球物理学报》1990,(2)

完成由两块大面积塑料闪烁体组成的粒子望远镜的研制,并测得合肥地区地面宇宙线μ子能谱.简要报道这台粒子望远镜的实际应用.  相似文献   

Etude et Mise au Point d'un Microdébitmetre Très Sensible et à Haute Résolution Applications à des Mesures et à des Tests au Sol     

H. Bardeau  A. Druilhet  M. Liousse 《Pure and Applied Geophysics》1987,125(1):91-108

Sommaire Nous avons mis au point un microdébitmètre électronique permettant des mesures de pression et pression différentielle, très sensible et à haute résolution.Le module étudié a une fréquence de coupure de 300 Hertz. Il permet de travailler dans une gamme de différence de pression de ±100 Pascal avec une résolution de 0,1 Pascal.L'appareil mis au point a permis de réaliser des series de tests de mesures au sol de la variation de pression dynamique de l'air et du coefficient de structure de ce paramètre.

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Environmental geochemistry of calcium isotopes： Applications of a new stable isotope approach     

刘占民刘丛强  韩贵琳王中良薛紫晨  宋照亮杨成 《中国地球化学学报》2006,25(2):184-194

1IntroductionIn nature, calcium has six naturally occurring sta-ble isotopes with atomic mass units (amu) and the a-bundances of40Ca (96.941%),42Ca (0.647%),43Ca (0.135%),44Ca (2.086%),46Ca (0.004%)and48Ca (0.187%) are presented in this paper.These analyt…  相似文献   

BOOK REVIEWS     

《The Professional geographer》1983,35(2):230-260

Book Reviewed in this article: Rabat: Urban Apartheid in Morocco . Janet Abu -Lughod . Marketplaces in a Developing Country: The Case of Western Nigeria . Isaac Ayinde Adalemo . Farming Development and Space: A World Agricultural Geography . Bernd Andreae . Section and Party: A Political Geography of American Presidential Elections, from Andrew Jackson to Ronald Reagan . J. Clark Archer and Peter J. Taylor . Women and Space: Ground Rules and Social Maps . Shirley Ardener , ed. European Progress in Spatial Analysis . R. J. Bennett , ed. The Origins of Academic Geography in the United States . Brian W. Blouet Geographic Perspectives on Global Problems . Ronald Reed Boyce . Seasonal Dimensions to Rural Poverty . Robert Chambers , Richard Longhurst and Arnold Pacey eds. The New Nationalism and the Use of Common Spaces: Issues in Marine Pollution and the Exploitation of Antarctica . Jonathan I. Charney , ed. Communications Tomorrow: The Coming of the Information Society . Edward Cornish , ed. The Design of Suburbia . Arthur Edwards . Explorer on the Northern Plains: Lieutenant Gouverneur K. Warren's Preliminary Report of Explorations in Nebraska and Dakota in the Years 1855–56–57. With an Introduction by Frank N. Schubert . The Changing Climate: Responses of the Natural Flora and Fauna . Michael J. Ford . Essentials of Physical Geography . Robert E. Gabler , Robert J. Sager , Sheila Brazier , and Daniel L. Wise. The Road to Jaramillo . William Glen . Valued Environments . John R. Gold and Jacquelin Burgess , eds. Proximity and Preference: Problems in the Multidimensional Analysis of Large Data Sets . Reginald G. Golledge and John N. Rayner , eds. A Search for Common Ground . Peter Gould and Gunnar Olsson , eds. Geography: Its History and Concepts . Arild Holt -Jensen . A Population Geography . Huw R. Jones . The Human Mosaic: A Thematic Introduction to Cultural Geography, 3rd ed. Terry G. Jordan and Lester Rowntree . Urban Social Geography: An Introduction . Paul Knox . The Anatomy of Job Loss: The How, Why and Where of Employment Decline . Doreen Massey and Richard Meegan . The Information Society as Post-Industial Society . Yoneji Masuda . Map Librarianship, 2nd ed. Harold Nichols . India: Cultural Patterns and Processes . Allen G. Noble and Ashok K. Dutt , eds. The God that Limps: Science and Technology in the Eighties . Colin Norman . Geography: An Introductory Perspective . Robert E. Norris , Keith D. Harries and John D. Vitek . The Politics of Technology Assessment . David M. O'Brien and Donald A. Marchand . Ethnic Segregation in Cities . Ceri Peach , Vaughan Robinson and Susan Smith , eds. Churches and Church Membership in the United States, 1980 . Bernard Quinn , Herman Anderson , Martin Bradley , Paul Goetting and Peggy Shriver . Energy in Australia: Politics and Economics . Hugh Saddler . Development from Above or Below? The Dialectics of Regional Planning in Developing Countries . Walter B. Stóuhr and D. R. Fraser Taylor , eds. Human Impact on the Ecosystem . Joy Tivy and Greg O'Hare . Plants and People: Vegetation Change in North America . Thomas R. Vale . The Mapmakers: The Story of the Great Pioneers in Cartography from Antiquity to the Space Age . John Noble Wilford .  相似文献   

非金属成矿与勘查开采技术 ——"非金属矿产"专辑特邀主编寄语     

王春连 《地球学报》2022,43(3):257-265

历史证明, 矿产资源是人类赖以生存、社会发展的物质基础。没有矿产资源的可持续供应和安全保障, 就没有国民经济与社会的可持续发展。据统计, 世界上95%的能源以及80%的工业原料来自矿物燃料, 而世界矿产年开采量的70%以上为非金属矿。随着社会的发展和科技的进步, 对非金属矿材料的需求将越来越多。为解决中国战略非金属找矿取得更大突破, 近年来在国家科技部(973计划)、国家自然科学基金委(自然科学基金重点)、自然资源部(国家级整装勘查区)、中国地质调查局(地质大调查)、中国科学院及有关省市自然资源部门的项目持续支持下, 国内有关科研院所和高校的地质工作者, 基于详细的野外地质调查和室内分析研究, 获得了大量的地质资料, 取得了一些重要的进展和新认识, 并实现了一些找矿的重大进展等。为迎接党的二十大胜利召开献礼, 将部分研究成果集中发表于《地球学报》非金属矿产专辑。主要内容涉及与非金属有关的矿物学(描述矿物学、理论矿物学、应用矿物学、矿相学及矿物中包裹体等方面的研究成果); 岩石学(区域性的岩浆岩、变质岩、沉积岩的岩类学、实验岩石学方面的基础理论和应用研究成果); 矿床学(非金属矿床); 矿床地球化学(包括流体包裹体、稳定同位素及成矿模拟实验)、与矿床有关的岩石学和矿物学、构造演化与成矿研究等。专辑包括综合篇、非金属矿产资源开发理论与技术篇、清洁能源篇、战略性非金属篇和找矿方法找矿预测篇5个部分, 本文将对收录本专辑的所有文章做简要介绍, 希望该专辑的研究成果能够为非金属矿产理论研究以及实现找矿突破提供参考和有益的帮助。  相似文献   

忽略水准标尺尺长误差改正的三等水准测量     

李宇新  修洪玉 《测绘与空间地理信息》2015,(8):196-197

为配合哈尔滨市委确定的南拓战略要求,需在哈南地区提供地形测图和各种工程建设所必需的高程控制点,所以在哈尔滨市二等水准网南侧加密扩充三等水准网。  相似文献   

光纤光化学氨传感器的研究及应用   总被引：2，自引：0，他引：2  

戴媛静  陈曦  庄峙厦  李伟  王小如 《海洋技术学报》2003,22(2):37-43

氨是导致海洋水体富营养化的重要因素之一，基于光纤光化学检测的氨传感器特别适于氨的原位或在线分析。文章介绍了光纤光化学氨传感器的基本原理，光纤敏感膜的制备方法及其一些应用管况。发展小型、实用的光纤光化学传感器是未来海水中氨的原位、在线检测的发展趋势之一。  相似文献   

Forced vibrations of a clamped-free beam with a mass at the free end with an external periodic disturbance acting on the mass with applications in ships’ structures     

D. V. Bambill  S. J. Escanes  C. A. Rossit 《Ocean Engineering》2003,30(8):645-1077

An exact, analytical solution is obtained for the title problem which constitutes a classical one although no solution is available in well known textbooks and handbooks normally used by the structural engineer in several fields of technology: ocean and naval engineering, aerospace applications, etc. The authors performed this study motivated by a situation where excessive displacements were noticed in a structural element carrying a relatively small motor at the free end and placed at the engine room of a naval vessel. The Bernoulli-Euler model has been employed.  相似文献   

Growth and photosynthetic rates of Chlamydomonas plethora and Nitzschia frustula cultures isolated from Kuwait Bay, Arabian Gulf, and their potential as live algal food for tropical mariculture     

Durvasula Venkata Subba Rao  Youlian Pan  & Faiza Al-Yamani 《Marine Ecology》2005,26(1):63-71

With a view to utilize local algae as food organisms in mariculture, the green alga Chlamydomonas plethora and the diatom Nitzschia frustula were isolated and studied from the unique coastal waters arid zone off Kuwait. Batch cultures of C. plethora and N. frustula had maximum division rates (μ_max) of 2.5 and 3.4 day^?1, respectively. Cultures grown for 36 h yielded comparable growth rates. Photosynthesis‐irradiance relationships in cultures harvested at various phases of growth showed that cultures attained log phase after 1‐day growth and yielded the highest assimilation numbers (P: μg C [μg Chl a]^?1 h^?1): 22.8 for C. plethora and 18.1 for N. frustula. Their initial slopes (α^B: ng C [μg Chl a]^?1 h^?1 [μmol m^?2 s^?1]^?1 were also the highest observed so far: 79.5 for C. plethora and 39.6 for N. frustula. Photoinhibition was low. Compared with these, assimilation numbers in senescent cultures of 20‐day growth were <8% of the maximum for both species, and the initial slope decreased to 17 and 13% in C. plethora and N. frustula, respectively. Two polyunsaturated fatty acids (20:5n‐3 eicosapentaenoic acid and 22:6n‐3 docosahexaenoic acid) that are essential in many marine animal diets constituted up to 24% and 1.9% of the total fatty acids, respectively. Of the two algae, N. frustula contained higher levels of 16:1n‐7, 20:5n‐3 and comparatively low levels of 22:6n‐3 fatty acids. Due to its rapid growth, high photosynthetic rate and presence of the amino acids leucine, lysine, glutamic acid and arginine N. frustula has good potential as a feed organism in mariculture applications. The capacity of these algae to produce a wide range of size groups (nano and net plankton) is an additional bonus for mariculture operations.  相似文献