在复杂岩层钻进中使用埋头套管的体会

我队在钻探施工过程中,对复杂地层的孔壁维护工作已摸索出点滴的经验。经近两午来生产实践证明,采用埋头套管维护孔壁,是效果较好的。我队矿区地质岩层情况及下埋头套管的具体过程是:1.矿区地质岩层情况:矿区施工的东部、北部几个剖面线的钻孔,大部     

图片新闻

11月4日,主题为“携手应对、共促发展”的2012中国国际矿业大会在天津梅江会展中心隆重开幕。中共中央政治局常委、国务院副总理李克强发来贺信。祝贺大会召开,并表达中国政府着力推动国际矿业合作与发展的良好愿望。     

回良玉在乌蒙山片区区域发展与扶贫攻坚启动会上强调——汇聚起扶贫攻坚强大合力 加快连片特困区脱贫致富

2月23日,国务院扶贫开发领导小组在地处云、贵、川三省接合部的云南省昭通市召开乌蒙山片区区域发展与扶贫攻坚启动会。中共中央政治局委员、国务院副总理、国务院扶贫开发领导小组组长回良玉强调,连片特困地区是我国新时期扶贫攻坚的主战场。     

带有差分GPS的多传感器无人直升机航测遥感系统

本文主要介绍作者在日本研制的一种基于无人直升机平台的多种传感器航测遥感系统,它直接采用GPS和IMU数据进行地理定位定向而不需要地面控制点。通过实飞数据对系统达到的几何精度进行了验证,结果表明该系统可用来测绘大比例尺地形图以及应用于其他相关领域。     

利用语义的多版本网络覆盖服务模式匹配方法

提出了一种基于节点相似度的语义模式匹配方法,首先对元素标签进行概念化,其次计算元素标签间的语义关系,再次计算节点概念并转化成合取范式CNF,最后利用命题可满足性问题解决器SAT验证节点间的概念关系。实验结果表明,该方法有效提高了匹配的查全率、精度和整体质量。     

利用GIS数据进行地图制图表达与更新

地理信息与制图信息的表达方式之间既有区别又有联系。为了实现两种信息的一体化表达,从制图的角度出发,设计了一种基于单要素的制图数据模型,并在此基础上提出了一种地图制图表达方法;最后以该制图表达方法为基础,给出了制图信息的增量式更新方法。     

黄淮海平原农区农户空心村整治意愿及影响因素实证研究

开展空心村整治是中国现代化建设中破解土地供需矛盾,推进新农村建设,促进城乡协调发展的重大战略。空心村整治必须以农户的广泛参与为基础,农户意愿是决定空心村整治成败的根本因素。以山东省禹城市为案例区,基于高分辨率航空影像和农户抽样调查数据,定量分析了空心村整治的农户意愿及其影响因素。抽样调查显示:27.1%农户无条件赞成空心村整治,59.9%农户表示依政府补偿而定,7.1%农户不赞成,5.9%持无所谓态度。农户空心村整治意愿影响因素的Logistic回归分析表明,农户意愿选择与户主的年龄、家庭子女情况、家庭收入构成、房屋建设年限、房屋建设面积、居住区位、承包耕地面积及村庄空废宅基地比例显著相关。农户的家庭特征是农户意愿选择考虑最多的因素;除农户户主年龄之外,户主自身的其他特征对意愿选择影响不显著;空心化程度越严重的村庄,农户赞成整治的可能性越大,而其他村庄环境因素影响不显著。传统农区空心村整治,应建立区域土地统筹配置机制,显化传统农区农村土地价值,减轻空心村整治给农户带来的经济负担;完善农户家庭利益保障机制,最大限度保护农户合法利益,消除农户的后顾之忧;制定空心村整治中长期规划,充分尊重农户意愿,分片区有序推进空心村整治。     

EFFECTS OF VERTICAL WIND SHEAR ON INTENSITY AND STRUCTURE OF TROPICAL CYCLONE

In this study,the effect of vertical wind shear(VWS)on the intensification of tropical cyclone(TC)is investigated via the numerical simulations.Results indicate that weak shear tends to facilitate the development of TC while strong shear appears to inhibit the intensification of TC.As the VWS is imposed on the TC,the vortex of the cyclone tends to tilt vertically and significantly in the upper troposphere.Consequently,the upward motion is considerably enhanced in the downshear side of the storm center and correspondingly,the low-to mid-level potential temperature decreases under the effect of adiabatic cooling,which leads to the increase of the low-to mid-level static instability and relative humidity and then facilitates the burst of convection.In the case of weak shear,the vertical tilting of the vortex is weak and the increase of ascent,static instability and relative humidity occur in the area close to the TC center.Therefore,active convection happens in the TC center region and facilitates the enhancement of vorticity in the inner core region and then the intensification of TC.In contrast,due to strong VWS,the increase of the ascent,static instability and relative humidity induced by the vertical tilting mainly appear in the outer region of TC in the case with stronger shear,and the convection in the inner-core area of TC is rather weak and convective activity mainly happens in the outer-region of the TC.Therefore,the development of a warm core is inhibited and then the intensification of TC is delayed.Different from previous numerical results obtained by imposing VWS suddenly to a strong TC,the simulation performed in this work shows that,even when the VWS is as strong as 12 m s-1,the tropical storm can still experience rapid intensification and finally develop into a strong tropical cyclone after a relatively long period of adjustment.It is found that the convection plays an important role in the adjusting period.On one hand,the convection leads to the horizontal convergence of the low-level vorticity flux and therefore leads to the enhancement of the low-level vorticity in the inner-core area of the cyclone.On the other hand,the active ascent accompanying the convection tends to transport the low-level vorticity to the middle levels.The enhanced vorticity in the lower to middle troposphere strengths the interaction between the low-and mid-level cyclonical circulation and the upper-level circulation deviated from the storm center under the effect of VWS.As a result,the vertical tilting of the vortex is considerably decreased,and then the cyclone starts to develop rapidly.     

自动站仪器的常规维护

主要介绍自动主站仪器常规维护的项目,包括微机系统、采集器、电源、传感器等的常规维护和注意事项。