湖南省气候变化代表站的选取   总被引：2，自引：0，他引：2  

彭嘉栋  廖玉芳  谭萍 《气候变化研究进展》2010,6(5):383-385

<正>气候变化问题已引起各国政府、科学家的广泛关注和高度重视[1-4]。众所周知,用于研究气候变化的资料不仅要有足够的序列长度,还应有足够的精确度。目前,我国开展气候变化研究的资料主要来源于地面气象观测台站的气象观测资料,因此,资料的均一性、代表性和比较性[5]  相似文献   

Detection of a tertiary companion in the eclipsing binary AD Andromeda     

Wenping Liao  Shengbang Qian 《New Astronomy》2009,14(3):249-253

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贵州及邻区二叠系锰矿地质特征及成矿作用探讨   总被引：11，自引：4，他引：7  

陶平  杜昌乾  马荣  朱华  杜芬应  韩忠华  廖莉萍 《贵州地质》2005,22(2):103-108,102

本文在系统收集和分析了近年来贵州锰矿资源评价工作及以往锰矿工作资料的基础上,获得了对贵州及邻区二叠系锰矿更深入系统的认识。主要成果为：认为该区中二叠世茅口期含锰岩系可大致对比,可沿用遵义锰矿产出地区所使用的名称——中二叠统茅口组白泥塘层（P2m^b）;水城纳雍锰矿与宣威格学锰矿特征及成矿机制十分相似,均为第四纪氧化富集成矿,矿床类型属于风化矿床类的锰帽型锰矿床亚类,矿质来源于原始沉积的含锰岩系——白泥塘层,而白泥塘层的锰质来源于中二叠世茅口期峨眉山玄武岩喷发;将贵州及邻区二叠系各类型锰矿床的特征及含锰岩系、物质来源、成矿作用等方面作了有机联系和系统分析,并建立了统一的成矿模式。  相似文献   

地震观测仪器网络化探讨   总被引：5，自引：2，他引：3  

魏银珍  郭唐永  廖成旺 《大地测量与地球动力学》2005,25(3):133-135

概述了我国地震前兆仪器的发展状况,分析了目前地震前兆仪器的现状及其网络化改造的必要性。介绍了DALLAS公司生产的以新型网络微控制器DS80C400 CPU为核心的TINI网络接口板的性能,提出了一种通过TINI网络接口板快速实现地震前兆仪器网络化的方案和实现该方案所必需的软件和硬件。  相似文献   

广西冬耕季农业气候资源对冬种马铃薯布局的影响   总被引：3，自引：0，他引：3  

廖雪萍  梁骏  黄梅丽  苏永秀  李政 《气象研究与应用》2012,33(4):47-50,109

通过分析广西冬耕季农业气候资源的空间分布特征,以及马铃薯气候生态条件,结合生产实际,选取了80％保证率的极端最低气温和霜日数、1～2月的平均气温、80％保证率的日平均气温≥5℃的积温、80％保证率的13平均气温≥IO℃的日数、11月～次年3月降水量作为区划指标,用专家打分法,得出广西冬种马铃薯的种植布局,其中最适宜气候区以沿海地区及桂东南部分县（市）为主。区划布局结果为保障冬种马铃薯稳产高产和广西粮食安全提供决策依据。  相似文献   

基于监测数据的几种地铁施工变形预测方法   总被引：1，自引：0，他引：1  

苏勇  高政国  廖翌棋 《岩土工程技术》2009,23(4):172-177

地铁工程施工引起的地表沉降常常危及周边建筑物或地下管线的安全,如何有效预测和控制地表沉降已成为工程中亟待解决的问题。论述了三种常用的变形预测方法——回归分析法、指数平滑法和灰色理论分析法,分别利用这三种方法对广州地铁土建工程盾构法施工、矿山法施工和明挖法施工引起的地表沉降进行了预测分析,并与工程实测监测数据进行了对比分析,论证了各种预测方法适用的施工工法、地质条件范围以及使用时应注意的问题。  相似文献   

Stable carbon isotopic fractionation of individual n-alkanes accompanying primary migration: Evidence from hydrocarbon generation–expulsion simulations of selected terrestrial source rocks     

Yuhong Liao  Ansong Geng   《Applied Geochemistry》2009,24(11):2123-2132

The effect of isotopic fractionation during primary migration of hydrocarbons from coals is rarely noticed because it overlaps with the isotopic effects of maturation. In this research, geological chromatography-like effects and possible physical isotopic fractionation effects on n-alkanes during primary migration from four coals and one mudstone were studied through two types of generation–expulsion simulations (generation–expulsion simulations I and II). In order to monitor the kinetic isotopic fractionation effect during primary migration and to differentiate the isotopic effects of primary migration from the isotopic effects of maturation, generation–expulsion simulation was upgraded in two aspects, source rock was separated into at least five layers, and deuterated n-C₁₅D₃₂ was added to the initial layer of the source rock (simulation II). The experimental results suggested that all terrestrial source rocks exhibit significant geological chromatography-like effects in generation–expulsion simulation. Expulsion efficiencies shown by vitrinite-rich coals are much lower than algal cannel, fusinite-rich coal and mudstone. There also exist significant physical isotopic fractionation effects in hydrocarbon primary migration processes from vitrinite-rich coals, but there is no significant isotopic fractionation effect from fusinite-rich brown coal and mudstone. Pore structure and specific surface area of source rock samples were measured by gas adsorption of both N₂ and CO₂. This indicated that vitrinite-rich coals have a higher proportion of microporosity. The differences in pore structure and adsorptive capacity of source rocks may be responsible for differences in expulsion efficiencies and isotopic fractionation effects in generation–expulsion simulations. The isotopic fractionation effect due to primary migration should be considered in making oil-source correlation when vitrinite-rich coals are concerned.  相似文献   

Hyperaccumulation of lead,zinc, and cadmium in plants growing on a lead/zinc outcrop in Yunnan Province,China   总被引：3，自引：0，他引：3  

S. L. Wang  W. B. Liao  F. Q. Yu  B. Liao  W. S. Shu 《Environmental Geology》2009,58(3):471-476

A field survey was conducted to identify potential hyperaccumulators of Pb, Zn or Cd in the Beichang Pb/Zn mine outcrop in Yunnan Province, China. The average total concentrations of Pb, Zn, and Cd in the soils were up to 28,438, 5,109, and 52 mg kg⁻¹, respectively. A total of 68 plant species belonging to 60 genera of 37 families naturally colonizing the outcrop were recorded. According to metal accumulation in the plants and translocation factor (TF), Silene viscidula was identified as potential hyperaccumulator of Pb, Zn, and Cd with mean shoot concentrations of 3,938 mg kg⁻¹ of Pb (TF = 1.2), 11,155 mg kg⁻¹ of Zn (TF = 1.8) and 236 mg kg⁻¹ of Cd (TF = 1.1), respectively; S. gracilicanlis (Pb 3,617 mg kg⁻¹, TF = 1.2) and Onosma paniculatum (Pb 1,837 mg kg⁻¹, TF = 1.9) were potential Pb hyperaccumulators. Potentilla griffithii (Zn 8,748 mg kg⁻¹, TF = 1.5) and Gentiana sp. (Zn 19,710 mg kg⁻¹, TF = 2.7) were potential Zn hyperaccumulators. Lysimachia deltoides (Cd 212 mg kg⁻¹, TF = 3.2) was a potential Cd hyperaccumulator. These new plant resources could be used to explore the mechanisms of Pb, Zn and/or Cd hyperaccumulation, and the findings could be applied for the phytoremediation of Pb, Zn and/or Cd-contaminated soils.  相似文献   

基于水稻生长模型的气象影响评价和产量动态预测   总被引：16，自引：4，他引：12       下载免费PDF全文

帅细强  王石立  马玉平  李迎春 《应用气象学报》2008,19(1):71-81

在对国际先进的水稻生长模型ORYZA2000进行模型调试、验证, 实现本地化的基础上, 以双季稻发育速率参数为主, 结合地形、气候、水稻熟性分布和当地生产实际, 将江南双季稻区按发育参数划分为7个区域, 实现了ORYZA2000模式在我国江南双季稻地区的区域应用。利用该模型进行了不同年份气象条件影响定量评估的应用试验, 评价结果与实际符合, 定量客观。探讨了利用机理性作物生长模式动态预测产量的方法。通过建立不同发育期的水稻模拟生物量与相对气象产量的相关统计模型, 结合趋势产量预测, 实现了地区级双季稻不同发育期的产量动态预测。外推检验结果表明, 各地早晚稻不同发育期的产量动态预测模型平均误差为4.8%~6.1%, 可初步用于业务。  相似文献   

CO₂倍增对我国东部极端降水的影响   总被引：1，自引：0，他引：1  

邹用昌  杨休群  潘志祥  孙旭光  房佳蓓  廖玉芳 《气候变化研究进展》2008,4(2):84-089

 利用GFDL-CM2.1耦合模式控制试验和CO₂增长试验逐日降水输出结果,评估了CO₂浓度加倍对我国极端降水变化的影响。结果表明：CO₂浓度加倍导致我国东部地区年极端降水的强度增强、降水量显著增多及降水频次显著增加（除华北南部外）; CO₂浓度加倍对我国春夏季极端降水影响较大,导致东部多数地区春夏季极端降水频次增加,强度增强;而CO₂浓度加倍导致华北南部和长江中下游春夏季雨日减少以及小雨、中雨减少,从而导致年总降水量减少。  相似文献