基坑空间效应影响区长度的探讨

基坑空间效应影响范围的确定对其支护方案的选择、施工方案的确定以及监测方案的设置具有较强的指导意义。通过对不同基坑空间效应计算模型的分析,基于新的三维滑楔体破坏模型,提出了空间效应影响区长度的计算公式。三种计算方法的比较分析表明,新的计算方法更全面的考虑了影响基坑空间效应的各种因素,计算过程较为简便,且计算结果能较好地符合监测结果。     

CYTOLOGICAL COMPARISON OF GAMETOGENESIS OF SCALLOPS, ARGOPECTEN IRRADIANS AND CHLAMYS FARRERI

Histological characteristics of gametogenesis of two kinds of scallops, gonochoric Chinese scallop, Chlamys farreri and hermaphroditic bay scallop, Argopecten irradians were investigated in this study. Spermatogenesis in C. farreri has different developmental stages: spermatogonia, primary spermatocyte, second spermatocyte, spermatid and spermatozoon. A large number of same developmental stage spermatic cells converge at a definite area of the testis. Premeiotic, previtellogenic and vitellogenic oocytes can be found during oogenesis in C. farreri, where oocyte distribution is obviously irregular. The A. irradians gonad consists of two different parts in one individual: one part functions as testis, the other as ovary. Between these two parts is a special appearance area, where a large number of spermatic cells are bound with two layers of acellular substance with many oocytes in it.     

松辽盆地东南隆起区油气分布规律及含油气系统

松辽盆地东南隆起区发育深、浅2套地层，深层系指上侏罗统，浅层系指下白垩统。地层整体上受松辽盆地构造演化的控制。深层以(扇)三角洲-湖泊相为主，同时发育火山喷发岩及其经过搬运之后形成的火山碎屑，属裂谷期沉积组合。浅层以河流相广泛发育为特征，属后裂谷期沉积组合。同时，受盆地类型控制，各侏罗系断陷盆地沉积相也有差别。深层晚侏罗世断陷阶段沉积层序，在区域上为分割性断陷群，陆源     

Analyses of structure of planetary boundary layer in ice camp over Arctic ocean

The vertical structure of Planetary boundary layer over Arctic floating ice is presented by using about 50 atmospheric profiles and relevant data sounded at an ice station over Arctic Ocean from 22 August to 3 September,2003.It shows that the height of the convective boundary layer in day is greater than that of the stability boundary layer in night.The boundary layer can be described as vertical structures of stability,instability and multipling The interaction between relative warm and wet down draft air from up level and cool air of surface layer is significant,which causes stronger wind shear,temperature and humidity inversion with typical wind shear of 10 m/s/100 m,intensity of temperature inversion of 8 ℃/100 m.While the larger pack ice is broken by such process,new ice free area in the high latitudes of arctic ocean.The interactions between air/ice/water are enhanced.The fact helps to understanding characteristics of atmospheric boundary layer and its effect in Arctic floating ice region.     

加强退耕还林(草)再造天山南北好风光

新疆属于典型的绿洲经济区域,绿洲面积仅占国土面积的4.2％,生态总体态势呈先天不足,后天失调,局部改善,整体恶化。全区80％的自然草场出现不同程度的退化和沙化,生态环境建设已到了刻不容缓的地步。实施退耕还林(草)工程,无疑给新疆生态环境建设带来新的希望和曙光。自2000年实施退耕还林工程以来,新疆累计完成退耕还林和宜林荒山荒地造林面积530万亩,其中退耕还林面积137万亩。一些地方退耕还林工作同结构调整、农田基本建设、扶贫开发相结合,走出一条生态改善、经济发展和农民增收“三赢”的路子。     

青海省三调办组织开展三调专项督察

正5月22日起,青海省三调办与青海省自然资源厅自然资源总督察办公室、调查监测处组成三调专项督察组,由青海省自然资源厅党组成员、副厅长、省自然资源副总督察、青海省三调办主任罗保卫带队,分别赴青海省8个市州开展三调专项督察。此次督察是为全面贯彻落实5月15日自然资源部"全国三调统一时点更新调查工作部署视频会议"精     

新疆精河县一带南华纪冰碛岩特征及意义研究

调查区位于新疆西部博罗科努山与科古尔琴山的接合部,南部山区属于博罗科努山北麓,西北部山区属于科古尔琴山东段。测区地层区划属塔里木-南疆地层大区,中南天山-北山地层区,中天山-马鬃山地层分区之温泉地层小区。通过填图及剖面调查对测区南华纪冰碛岩特征分析,与区域上冰碛岩具有可比性,确定其时代为南华纪。     

加强顶层谋划 促进海洋事业和海洋经济持续健康发展——战略规划与经济司“十二五”工作回顾及“十三五”工作展望

正在国家海洋局党组的正确领导下,"十二五"期间,战略规划与经济工作着眼建设海洋强国总目标,围绕制定海洋发展战略,推进海洋基本法立法,编制实施国家海洋事业规划、全国海洋经济规划和全国海洋主体功能区规划,加强海洋经济运行监测评估,促进海洋经济健康发展等中心工作,加强战略研究,创新工作思路,密切部门合作,较好地完成了各项     

内蒙古北山地区黑红山一带斑状花岗闪长岩地球化学特征、LA-ICP-MS锆石U-Pb年龄及其地质意义

北山地区黑红山一带出露的晚石炭世斑状花岗闪长岩大地构造位置位于北山-天山造山系、额济纳-北山弧盆系,至今未见可靠的同位素年龄报道。在运用阴极发光技术对岩石中的锆石进行内部结构分析的基础上,利用LA-ICP-MS锆石UPb同位素原位定年方法获得206Pb/238U年龄加权平均值为312.1±3.2Ma。岩石化学研究显示,斑状花岗闪长岩属中钾钙碱性、准铝质-弱过铝质系列,具I型花岗岩特征;轻稀土元素富集,轻、重稀土元素分馏明显,稀土元素配分曲线右倾;微量元素不同程度地富集Rb、Th、K、Hf,亏损Ta、Nb、Ti、P等元素,显示其形成于板块碰撞前的火山弧环境。结合区域地质背景分析,红石山-百合山-蓬勃山蛇绿岩带代表的洋盆在晚石炭世尚未消亡。