FAST故障促动器快速拆换机构设计与研究     

薛建兴  雷政  古学东  王启明 《天文研究与技术》2015,12(1)

针对射电望远镜FAST促动器存在长期承受重载拉力、洼地使用、潮湿多雨、数量大、分布广、设计寿命长等维护不利条件,基于接口便于安装、加载安全可靠、拉杆地面调节、拆换销轴爬梯的设计要点,提出了一种故障促动器快速拆换机构方案,并对关键技术进行研究:包括上连杆开口非封闭C型结构强度、刚度及轻量化有限元分析,抗剪键组件运动控制计算。以上工作为后续快速拆换机构物理样机研制提供了设计方案、分析思路及计算方法,也对解决同类重型加载装置的拆换具有借鉴意义。  相似文献   

我国古代两种珍稀宝玉石文物分析     

董俊卿  干福熹  李青会  顾冬红  阚绪杭  程永建 《地质科学译丛》2011,(3):46-52

为了科学辨别易混淆文物的材质,以蓝绿色和蓝紫色宝玉石文物为例,利用外束质子激发X射线荧光、便携式能量色散X射线荧光、激光拉曼光谱和X射线衍射分析等现代无损科技手段,从安徽蚌埠双墩一号春秋墓、河南洛阳烧沟东汉墓和新疆和田皮山古城唐代墓葬中甄别与鉴定出被误认为是绿松石和琉璃（玻璃）器的天河石串珠和青金石耳？及青金石管饰。简要阐述了这两种彩色宝玉石的矿物学特征及应用历史。这三件彩色宝玉石文物的发现,丰富了中国宝玉石史的研究内容,拓宽了对我国古代先民开采、引进及应用宝玉石的认识。  相似文献   

乌裕尔河流域颗粒有机碳的来源：碳同位素证据   总被引：1，自引：0，他引：1       下载免费PDF全文

侯青叶  杨忠芳  余涛  顾兆炎  夏学齐  沈承德 《地学前缘》2011,18(6):150-160

以2008、2009年所采集的乌裕尔河9个点位水体中的悬浮物为研究对象,对丰、枯水期颗粒有机碳（POC）含量、碳同位素组成（^13C、^14C）及表观年龄进行了系统测试与分析,以期探讨河流中颗粒有机碳来源与流域土壤侵蚀的关系。研究结果表明,该河流中颗粒有机碳（POC）主要来源于未受玉米残体及根系输入影响的深层土壤,且土...  相似文献   

双频激电在内蒙中部地区矿产评价中的应用     

张开盾  张林  谷开拓 《陕西地质》2011,29(2):66-71

针对工作区地表干燥、基岩裸露、电极接地和供电比较困难等因素,采用双频激电中梯装置方法工作。根据圈定的激电异常组合特征,对激电异常进行了分类和综合解释推断,区分出矿（化）体和含炭质地层干扰异常,以此确定地表工程揭露位置。工程揭露结果与激电异常的解释结果基本一致,说明在一定的条件下,利用激电异常的展布及组合特征区分矿与非矿是可行的。  相似文献   

Petroleum System of the Fula Depression at the Muglad Basin in the Central African Fault Zone     

张亚敏  顾勤 《中国地质大学学报(英文版)》2011,(3)

Petroleum system theory has been used to study characteristics of the Fula depression in the Central African fault zone.In this system,deep lacustrine facies mudstone in the Abu Gabra For-mation of the Lower Cretaceous is a very good source rock,thick deltaic facies sandstone of the Abu Gabra Formation and fluvial facies sandstone of the Bentiu Formation are good reservoir beds,and the mudstone in the Upper Cretaceous Darfur Group is the regional cap rock.The oil search mode and fault block trap seal-off co...  相似文献   

四川盆地环开江——梁平海槽长兴组——飞仙关组沉积模式   总被引：5，自引：1，他引：4  

张建勇  周进高  郝毅  王小芳  吕玉珍  张大智  徐美茹  张润合  谷明峰  张敬艺 《海相油气地质》2011,16(3):45-54

在综合分析的基础上确定了环开江--梁平海槽长兴组--飞仙关组的层序划分方案,长兴组和飞仙关组均可划分出两个三级层序.在层序格架内进行了岩相古地理的编图及演化分析,认为在台地边缘不同地区具有不同的岩相古地理特征,发育不同类型的台地边缘.结合地震资料及钻井资料建立了台地边缘的三种沉积模式:(1)以剑阁地区为代表的"进积型台...  相似文献   

Retrieval and analysis of coal fire temperature in Wuda coalfield,Inner Mongolia,China     

Weiguo Jiang  Xiaohua Zhu  Jianjun Wu  Lei Gu  Guobin Ma  Xiaochen Liu 《中国地理科学(英文版)》2011,21(2):159-166

Coal fire burning around the world is an environmental catastrophe characterized by the emission of noxious gases, particulate matter, and condensation by-products. In this study, coal fire temperature is retrieved based on Landsat 5 TM images and Generalized Single-Channel Algorithm (GSCA), in Wuda coalfield, Inner Mongolia, China. Then coal fire zones are extracted by Jenks′ natural breaks and threshold methods based on temperature images. Changes of coal fire zones are analyzed from 1989 to 2008. The results are summarized as follows: 1) The coal fire temperature retrieval method based on Landsat 5 TM and the GSCA model is effective and feasible, because the temperature error is relatively small (from –2.9℃ to +2.6℃) between the measured temperature and the retrieved temperature. 2) The accuracy is relatively high to extract coal fire zones through the Jenks′ natural breaks and threshold methods, because 83.56% of surveyed area is located in the coal fire zones extracted in 2005. 3) The coal fire area increased 9.81 × 10 5 m 2 from 1989 to 2005, and the annual growth is about 6.1 × 10 4 m 2 , with an annual increasing rate of 2.48%. The area of coal fire decreased by 8.1 × 10 5 m 2 from 2005 to 2008.  相似文献   

The bulk transfer coefficients in the permafrost region at the Tanggula Pass of Tibetan Plateau     

LiangLei Gu  JiMin Yao  Lin Zhao  ZeYong Hu  YongPing Qiao 《寒旱区科学》2011,3(4):0366-0373

This paper presents research on the surface drag coefficients, C_D, and the bulk transfer coefficients of sensible heat flux, C_H, in the permafrost region at the Tanggula Pass of the Tibetan Plateau. The data were obtained from the Open-Path Eddy Covariance System and the 10-m Automatic Weather Station (AWS) at the TGLMS site which supported by Cryosphere Research Station (Chinese Academy of Science) on the Qinghai-Xizang Plateau (Tibetan Plateau). The characteristics of C_D and C_H in relation to atmospheric instability and wind velocity are discussed, and it was found that the bulk transfer coefficients varied with air conditions and were different in different months. However, the bulk transfer coefficients obtained from the eddy covariance system did not show a significant increasing trend with increasing atmospheric instability, and the bulk transfer coefficients did not change greatly with increasing wind velocity at 10 m.  相似文献   

振冲碎石桩在加固砂性土地基中的应用     

顾香萍 《浙江国土资源》1999,(2)

本文介绍在杭州市钱江水厂一期工程中，采用振冲碎石桩加固处理砂性土地基，既提高了地基的抗液化能力，又提高了复合地基承载力，取得了良好的效果，并在该水厂建设的后续工程中得到推广应用。  相似文献   

T／P，Jason-1测量风速及有效波高的验证与比较   总被引：1，自引：0，他引：1  

程永存  徐青  刘玉光  李崇银  顾艳镇 《大地测量与地球动力学》2008,28(6)

选取与T/P(TOPEX/POSEIDON)卫星高度计同步的浮标资料以及月平均浮标资料对T/P卫星高度计测量结果进行验证,结果表明:选取较窄的空间窗口以及较长的资料序列,可以减小浮标测量结果和高度计测量结果之间的误差;在所选浮标海域,浮标测量获得的有效波高与T/P测得有效波高存在0.3m的系统误差.T/P卫星高度计和Jason-1卫星高度计测量结果的比较显示,由于受海浪成长状态和仪器噪声的影响,二者测量获得的标准化雷达后向散射截面在低风速时相差较大,在高风速时符合较好.T/P和Jason-1卫星高度计测量获得的有效波高和海面高度异常的均方根误差分别为0.21 m和0.05 m.  相似文献