永恒的回忆——写在父亲逝世10周年之际          下载免费PDF全文

李亮  李爽 《第四纪研究》2002,22(1):85-94

我们的父亲出生在一个淳朴的农民家庭,简朴的生活培育了他对故土、对人民深厚朴素的感情。他为人正直,性情豁达,襟怀坦荡。在遭遇坎坷时,始终对生活充满热爱和信心。父亲作为中国老一代的土壤学家,为了中国土壤科学的发展和农业生产的进步呕心沥血,经常奔波忙碌在祖国各地。在他主持和参加过的工作中,如西藏和新疆等地的农业综合科学考察、湖南南山牧场的建设和华北黄淮海盐碱地治理等主要工作中,处处体现出他的爱国之心和敬业精神,使我们深受教育,激励着我们永远前进。  相似文献   

Moving boundaries in transboundary air pollution co-production of science and policy under the convention on long range transboundary air pollution     

Willemijn Tuinstra  Leen Hordijk  Carolien Kroeze 《Global Environmental Change》2006,16(4):349-363

This article focuses on the science–policy interaction in international negotiations in the context of the United Nations Economic Commission for Europe's Convention for Long Range Transboundary Air Pollution (CLRTAP). It addresses the question how participants in the assessment process divide and co-ordinate work between science and policy and how this enhances credibility, legitimacy and relevance with multiple audiences. For this purpose the article combines an analytical framework to approach effectiveness of scientific assessment in policy making, with the notion of boundary work and co-production of science and policy. The article argues that knowledge produced within the CLRTAP process and the institutional setting in which this knowledge production takes place cannot be separated from each other. Furthermore credibility, legitimacy and relevance are to a large extent determined by boundary work in an early stage of the process. At the same time boundary work has to take place continuously in order keep the assessment process credible, legitimate and relevant for new audiences. The application of a combined framework for analysing credibility, legitimacy and relevance and for analysing boundary work turns out to be helpful in describing in detail what happens in practice at the science–policy interface. In particular it helps to address the question of the way participants in the assessment process divide and co-ordinate work, how this shapes design elements and how this enhances credibility legitimacy and relevance of an assessment.  相似文献   

水压致裂地应力测试方法在云南大理-丽江铁路隧道工程中的应用   总被引：6，自引：1，他引：6  

李金锁 彭华马秀敏  黎建文廖怀青 杨绍喜 《地质通报》2006,25(5):644-648

利用水压致裂地应力测试方法对实际工程区进行了地应力测量,确定了工程区隧道围岩现今的地壳应力状态,即原地应力的大小和方向.根据地应力分布特征,分析了隧道开挖过程中发生岩爆等地质灾害的可能性.地应力测量数据的分析结果可作为隧道衬砌的设计、断面的选择及轴线方位的确定的科学依据.  相似文献   

2006年新疆地质矿产勘查进展及2007年工作要点   总被引：1，自引：0，他引：1  

董连慧  李凤鸣 《新疆地质》2007,25(1):1-3

2006年是新疆地质矿产勘查“十一五”规划实施的第一年,地质勘查投入进一步加大,钠硝石找矿取得了重大突破,铁、铅锌、铜镍及煤的找矿也取得了重要进展,基础地质工作程度进一步提高,高新技术方法的应用得到加强,“环准噶尔”和“环塔里木”控制铜、铜镍、铅锌、铁等矿床重要成矿类型的规律逐渐显现.2007年将突出“环准噶尔”和“环塔里木”两个新领域的找矿工作,加快构建基础科研、高新技术应用研究、矿产勘查等相配套的科学的地质勘查体系.  相似文献   

关于地震现场声像拍摄工作的探讨     

李小邨 《高原地震》2007,19(4):61-64

依据学习心得和工作经验，探讨了在破坏性地震现场要如何做好声像工作的问题。  相似文献   

柳州市风能资源初步评价     

谢东 《广西气象》2007,28(3):38-39

简要介绍柳州市风能资源评价工作的方法、成果,并对发展柳州市风电事业提出了一些探讨性思路。  相似文献   

Bifurcation and second‐order work in geomaterials     

François Nicot  Félix Darve  Huynh Dat Vu Khoa 《国际地质力学数值与分析法杂志》2007,31(8):1007-1032

In this paper, the ability of a material rate‐independent system to evolve toward another mechanical state from an equilibrium configuration, with no change in the control parameters, is investigated. From a mechanical point of view, this means that the system can spontaneously develop kinetic energy with no external disturbance from an equilibrium state, which corresponds to a particular case of bifurcation. The existence of both conjugate incremental strain and stress such that the second‐order work vanishes is established as a necessary and sufficient condition for the appearance of this bifurcation phenomenon. It is proved that this fundamental result is independent of the constitutive relation of the rate‐independent material considered. Then the case of homogeneous loading paths is investigated, and, as an illustration, the subsequent results are applied to interpret the well‐known liquefaction observed under isochoric triaxial loading conditions with loose granular materials. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

湘南地区成矿规律及找矿预测     

谭文敏 《矿产与地质》2010,24(6):533-537

文章对湘南区带内各矿田找矿成果进行了归纳总结,并对其已有的多种地学成果信息进行了探索性研究,总结出了矿床地质特征、成矿系列类型、控矿因素及成矿模式,并大胆地进行了科学的预测定位,为湘南区带新一轮接替资源找矿提供新的认识和思路。  相似文献   

彰武工区快速钻井工艺技术     

俞宪生 《探矿工程》2014,41(5):29-32

针对彰武工区部分断陷地层含砾,易斜、易塌、易漏,研磨性强等特点,通过建立地层可钻性及三压力剖面,推广试验高效钻头、单弯螺杆加PDC钻头复合钻具、新型堵漏材料及堵漏措施等,为快速钻井奠定了基础,并形成了彰武工区快速钻井工艺技术系列。  相似文献   

基于CASIO fx-5800计算器编制计算曲线桥墩坐标     

王心旺 《北京测绘》2014,(6):122-124

根据单线铁路曲线桥墩与路线中线之间的设计关系,以及桥梁工作线、桥墩横向偏心、纵向偏心。基于CASIO fx-5800计算器编制计算曲线桥墩坐标,将结合工程实例讨论曲线桥墩上任意点坐标计算,施工中常用方法。  相似文献