The Weather Forecasting System for Poseidon - an Overview     

A. Papadopoulos  P. Katsafados  G. Kallos  S. Nickovic 《Journal of Atmospheric & Ocean Science》2002,8(2):219-237

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史料考证与找矿(之四)：个旧锡矿   总被引：1，自引：0，他引：1  

薛步高 《云南地质》2002,21(4):447-455

著名的个旧锡矿，据史料在元廿七年（1290年），率先在老厂矿区银铜矿开始采银（铅）-锌矿。清康熙四十六年（1707年），始由官方主持大规模开发砂锡矿，直至民国初年（1910年）都以采-冶砂锡为主，元廿七年后，银硐，黄茅山，竹林山，龙树脚等老硐深部，相继发现并转入原生锡矿开采。个旧300余年的采-选-冶开发史，使当地矿工在识别砂锡，脉锡不同矿石类型（荒），涮碗目测品位，水力采矿（冲荒尖），水力洗选（溜口），土法炼锡，锡锭表面“花口”识别等诸多领域，创造出一套完整的采-选-冶工艺，在中国矿业史上作出重大贡献。  相似文献   

中国绿洲研究之进展   总被引：41，自引：2，他引：39  

韩德林 《地理科学》1999,19(4):313-319

绿洲是干旱区独具特色的生态景观。近１０多年来,中国绿洲研究取得长足进展,在绿洲与绿洲系统、绿洲形成演变,绿洲的建设,调控与可持续发展等研究领域取得一批重要成果。要明确其研究对象与学科性质,紧紧围绕主要研究内容,进一步推动我 洲研究向更层次发展,愉占居国际前沿阵地。  相似文献   

长乐市地震地质构造背景与地震活动关系的研究     

林依再  杨贵 《福建地震》2001,(4)

本文根据近年来福建沿海以及福州市地震地质勘探调研的最新成果 ,分析了长乐市地质构造背景与地震活动的关系 ;为跨断层土壤氡气 ,二氧化碳观测等手段的监测资料分析 ,以及地震预报提供依据。  相似文献   

地缘政治历史、现状与中国的地缘战略^*   总被引：2，自引：1，他引：2  

刘妙龙  孔爱莉  张伟 《地理研究》1994,13(3):69-75

本文回顾了地缘政治学湮灭、复苏与自70年代以来发展的历史;对西方地缘学家对冷战结束后全球地缘政治格局的观点和主张进行了介绍和评述;提出了中国在未来全球地缘政治格局中的地缘战略的初步思考,旨在推动我国地理学界参与地缘政治战略的讨论和研究及人文地理学的发展.  相似文献   

Geological exploration history of the Eastern Sahara     

E. Klitzsch 《International Journal of Earth Sciences》1994,83(3):475-483

The major contributions to our knowledge of the geological history of the East Saharan countries are described. Much work has been published on the history and progress of geographical, socioeconomic and archaeological exploration in North Africa. Little attention, however, has been paid to the question of how our knowledge of the geology of this vast area was developed. Thus, even though progress in geology is vital to the development of Saharan countries, little has been recorded of this progress. Without an understanding of regional geology and without a good knowledge of groundwater, mineral and petroleum potentials, these countries would be in very different situations today. The author has, over the last 35 years, been involved in scientific research and exploration of petroleum, mineral and groundwater resources in Libya, Egypt, Sudan and Chad.  相似文献   

国外土壤风蚀的研究历史与特点   总被引：14，自引：7，他引：14  

董治宝  严平 《中国沙漠》1995,15(1):100-104

根据国外土壤风蚀的发展和研究成果，本文将土壤风蚀研究历史划分为四个阶段。第一阶段大致在本世纪二十年代以前，为土壤风蚀研究的萌芽阶段，以土壤风蚀现象的认识和描述为主；本世纪三十年代到六十年代中期，为土壤风蚀科学研究大发展阶段，实现了由定性描述到定量研究的突破；六十年代中期到八十年代中期，为土壤风蚀研究理论的检验与完善阶段。自本世纪八十年代中期之后，土壤风蚀研究进入了全球性研究阶段。  相似文献   

大气气溶胶吸湿性质国内外研究进展   总被引：14，自引：1，他引：13  

刘新罡  张远航 《气候与环境研究》2010,15(6):808-816

大气气溶胶的吸湿性质是联系气溶胶微物理、化学参数的桥梁和纽带之一,更是气溶胶基本光学性质的决定性参数之一,因此研究气溶胶吸湿性质在整个大气气溶胶科学研究中处于基础地位。对气溶胶吸湿性质的研究意义、研究方法与技术、主要研究结论做了系统回顾,并指出该研究领域存在的不足并对未来的研究方向做出展望。众多研究者从实验室分析、外场实验、数值模拟3个方面来研究颗粒物的吸湿性质,研究表明大气气溶胶的吸湿性质对研究大气能见度、大气辐射强迫具有重要影响。国内对大气气溶胶吸湿性质的研究数量偏少,研究方法单一,在国内广泛开展气溶胶吸湿性质的研究非常必要。  相似文献   

Mineralogical characterization of saprolite at the FRC background site in Oak Ridge,Tennessee     

Young-Jin Kim  Ji-Won Moon  Yul Roh  Scott C. Brooks 《Environmental Geology》2009,58(6):1301-1307

The Field Research Center (FRC) including five contaminated sites and a clean background area was established in Oak Ridge, Tennessee, as a part of the U.S. Department of Energy’s Natural and Accelerated Bioremediation Research (NABIR) program. This study investigates the mineralogy and mineralogical pathways of saprolite at the FRC background site to provide a fundamental basis for the remediation strategy for contaminated sites. The background site is underlain interbedded shales, siltstones, and limestones with nearly identical characteristics to the contaminated sites. Bulk samples of saprolite were collected by hand picking approximately at 1 m depth (C horizon) from the soil surface. The soil pH of 4.3 and cation exchange capacity (CEC) of 10.5 cmol/kg measured are in the range of the typical shallow depth saprolite layer in this area. Total Fe by citrate-bicarbonate-dithionate (CBD) and ammonium oxalate extractable (amorphous) were 17.6 and 0.61 g/kg, respectively. Total Mn extracted by NH₂OH·HCl was 0.17 g/kg. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses indicate that quartz, illite, and microcline (K-feldspar) are the dominant minerals, occupying 95% of mineral composition. The saprolite samples analyzed have shown characteristics of oxic conditions overall, and the degrees of weathering for three sampling locations were various, most for S1 and least for S3, likely influenced either by the flow channels developed through saprolite or by seasonal fluctuation of the groundwater table. The source of the manganese oxide that observed from the site is likely to be Mn-rich muscovite in the shale or Mn-rich biotite in the blackish band in the limestone. The results such as abundant Mn and Fe contents identified encouraging prospects for conducting remediation projects in FRC sites.  相似文献   

Density variations of Cr-rich garnets in the upper mantle inferred from the elasticity of uvarovite garnet     

Steeve Gréaux  Akihiro Yamada 《Comptes Rendus Geoscience》2019,351(2-3):95-103

The thermoelastic parameters of Ca₃Cr₂Si₃O₁₂ uvarovite garnet were examined in situ at high pressure up to 13 GPa and high temperature up to 1100 K by synchrotron radiation energy-dispersive X-ray diffraction within a 6-6-type multi-anvil press apparatus. A least-square fitting of room T data to a third-order Birch–Murnaghan (BM3) EoS yielded K₀ = 164.2 ± 0.7 GPa, V₀ = 1735.9 ± 0.3 ų (K’₀ fixed to 4.0). P–V–T data were fitted simultaneously by a modified HT-BM3 EoS, which gave the isothermal bulk modulus K₀ = 163.6 ± 2.6 GPa, K’₀ = 4.1 ± 0.5, its temperature derivative (?K_0,T/?T)_P = –0.014 ± 0.002 GPa K^?1, and the thermal expansion coefficients a₀ = 2.32 ± 0.13 ×10^?5 K^?1 and b₀ = 2.13 ± 2.18 ×10^?9 K^?2 (K’₀ fixed to 4.0). Our results showed that the Cr³⁺ enrichment in natural systems likely increases the density of ugrandite garnets, resulting in a substantial increase of mantle garnet densities in regions where Cr-rich spinel releases chromium through a metasomatic reaction.  相似文献