高Tc(YBaCuO DyBaCuO)超导相陶瓷晶体中的显微孪晶及其晶相     

祖振杰  陈云兰 《地球科学》1988,(4)

多数人认为“高TcYBaCuO、DyBaCuO稳定超导相晶体均属正交相,而超导性能又与结构的正交性密切相关,即正交性越好其超导性能亦越好”。作者在近期对不同单位所提供的样品进行统计研究发现“凡属高TcYBaCuO和DyBaCuO系列陶瓷超导晶体的大多数均属单斜相,其实质是由单斜相微小页片状孪晶单体所组成的,但就由页片状孪晶片所组成的长柱状整个晶粒而言,又显正交相光学特点,然而这种正交相也只能称之为假正交相”。  相似文献   

Unsupervised Machine Learning for Lithological Mapping Using Geochemical Data in Covered Areas of Jining,China     

Wu  Guopeng  Chen  Guoxiong  Cheng  Qiuming  Zhang  Zhenjie  Yang  Jie 《Natural Resources Research》2021,30(2):1053-1068

Natural Resources Research - Application of (supervised and unsupervised) machine learning algorithms to big geoscience data can facilitate intelligent lithological mapping and interpretation in a...  相似文献   

城镇化背景下广州流动儿童对“家”空间的建构   总被引：3，自引：0，他引：3  

陈淳  袁振杰  朱竑 《地理学报》2018,73(12):2440-2451

随迁流动儿童是当下中国流动人口重要且长期被学术界忽视的部分。城乡的空间跨越和生境差异对儿童关于“家”的理解产生深远影响。在文献回顾的基础上,以广州流动儿童作为研究对象,从“儿童视角”出发,通过绘图、写作、焦点小组讨论等适合儿童特点的方法进行数据的收集和分析,探讨城市流动儿童在家的建构过程中的参与和主观感知。主要结论为：① 随迁流动儿童经历着复杂的家庭分离和重组,这种动力机制在空间上体现出“家”空间的不确定性和不稳定性。流动性已成为新型城镇化背景下家空间最重要的特性;② 随迁流动儿童的“家”是城市的“家”和乡村的“家”叠加起来的意象。城市流动儿童摇摆在“城”与“乡”之间,其生长的经历中混杂着城市与乡村两种人地关系和生活经历。“城—乡”二元的混杂成为新型城镇化背景下理解“家”空间的重要路径;③ 流动儿童拥有构建“家”空间的能动性和策略。在“家”的构建过程中,流动儿童充分发挥他们的能动性,通过分担家庭责任等方式成为迁移的积极参与者,即使经历着与家庭成员的频繁分离,他们依然有自己的策略去维系“家”的存在,实现整个家庭在城乡迁移过程中的完整性和稳定性。研究结论丰富了国内人文地理学视角下的移民研究及儿童研究的相关理论成果,并为认识和缓解当前流动儿童问题提供可借鉴的实践经验和政策建议。  相似文献   

A Re-recognition of Hydrocarbon Accumulation Regularity in the Middle-late Stage of Reservoir Development: a Case Study from NB35-2 Oilfield in Bohai Bay Basin     

QUAN Honghui  ZHANG Zhang  LI Shuabao  ZHANG Zhenjie  HUANG Lei 《《地质学报》英文版》2015,89(Z1):210-210

<正>According to the contradiction between production and geologic cognition in NB35-2 Oilfield,Bohai Bay Basin,palaeogeomorphology,depositional feature and reservoir forming model have been re-analyzed,as well as the resource potential.In order to study the petroleum geology of NB35-2 oilfield,various kinds of information,such as seismic data,well logging data,drilling cores and  相似文献   

Effects of sedimentary layer on earthquake source modeling from geodetic inversion     

Weiwen Chen Sidao Ni  Shengji Wei Zhenjie Wang  Jun Xie Mengcheng National Geophysical Observatory  University of Science  Technology of China  Hefei  China CAS Key Laboratory of Geodynamical Geodesy 《地震学报(英文版)》2011,(2):221-227

Ground deformation as observed with GPS or InSAR has been broadly inverted in constraining source parameter of earthquakes. However, for earthquakes occurring beneath sedimentary basins, the very slow sub-surface shear velocity (v S , down to 200 m/s) may cause substantial bias to earthquake source inversion if simple crustal models are used. For Bohai basin, Sichuan basin and rock-sites, we test effects of sub-surface shear velocity structure on ground deformation, and find that up to a factor of 2 overest...  相似文献   

Conodont Biostratigraphy and Age Determination of the Lower–Middle Triassic Boundary in South Guizhou Province, China     

YAO Jianxin  JI Zhansheng  WANG Liting  WANG Yanbin  WU Zhenjie  LIU Dunyi  WU Guichun  ZHANG Jianwei  LI Suping 《《地质学报》英文版》2011,85(2):408-420

The demarcation of the Lower–Middle Triassic boundary is a disputed problem in global stratigraphic research. Lower–Middle Triassic strata of different types, from platform to basin facies, are well developed in Southwest China. This is favorable for the study of the Olenekian–Anisian boundary and establishing a stratotype for the Qingyan Stage. Based on research at the Ganheqiao section in Wangmo county and the Qingyan section in Guiyang city, Guizhou province, six conodont zones have been recognized, which can be correlated with those in other regions, in ascending order as follows: 1, Neospathodus cristagalli Interval-Zone; 2, Neospathodus pakistanensis Interval-Zone; 3, Neospathodus waageni Interval-Zone; 4, Neospathodus homeri-N. triangularis Assemblage-Zone; 5, Chiosella timorensis Interval-Zone; and 6, Neogongdolella regalis Range-Zone. An evolutionary series of the Early–Middle Triassic conodont genera Neospathodus-Chiosella-Neogongdolella discovered in the Ganheqiao and Qingyan sections has an intermediate type named Neospathodus qingyanensis that appears between Neospathodus homeri and Chiosella timorensis in the upper part of the Neospathodus homeri-N. triangularis Zone, showing an excellent evolutionary relationship of conodonts near the Lower–Middle Triassic boundary. The Lower–Middle Triassic boundary is located at 1.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Qingyan section, whereas this boundary is located 0.5 m below the top of the Ziyun Formation, where Chiosella timorensis Zone first appears in the Ganheqiao section. There exists one nearly 6-m thick vitric tuff bed at the bottom of the Xinyuan Formation in the Ganheqiao section, which is usually regarded as a lithologic symbol of the Lower–Middle Triassic boundary in South China. Based on the analysis of high-precision and high-sensitivity Secondary Ion Mass Spectrum data, the zircon age of this tuff has a weighted mean 206Pb/238U age of 239.0±2.9Ma (2s), which is a directly measured zircon U-Pb age of the Lower–Middle Triassic boundary. The Ganheqiao section in Wangmo county can therefore provide an excellent section through the Lower–Middle Triassic because it is continuous, the evolution of the conodonts is distinctive and the regionally stable distributed vitric tuff near the Lower–Middle Triassic boundary can be regarded as a regional key isochronal layer. This section can be regarded not only as a standard section for the establishment of the Qingyan Stage in China, but also as a reference section for the GSSP of the Lower–Middle Triassic boundary.  相似文献   

Conodont Biostratigraphy and Age Determination of the Lower-Middle Triassic Boundary in South Guizhou Province,China     

YAO Jianxin  JI Zhansheng  WANG Liting  WANG Yanbin  WU Zhenjie  LIU Dunyi  WU Guichun  ZHANG Jianwei  LI Suping Institute of Geology  Chinese Academy of Geological Sciences  Beijing  China Guizhou Bureau of Geology  Mineral Resources  Guiyang  China 《《地质学报》英文版》2011,(2)

The demarcation of the Lower-Middle Triassic boundary is a disputed problem in global stratigraphic research.Lower-Middle Triassic strata of different types,from platform to basin facies, are well developed in Southwest China.This is favorable for the study of the Olenekian-Anisian boundary and establishing a stratotype for the Qingyan Stage.Based on research at the Ganheqiao section in Wangmo county and the Qingyan section in Guiyang city,Guizhou province,six conodont zones have been recognized,which ca...  相似文献   

辽宁沿海经济带产业结构分析   总被引：1，自引：0，他引：1  

关伟  蔚振杰 《地域研究与开发》2011,30(4)

辽宁沿海经济带开发开放上升为国家战略之后不仅使其成为全省经济总量扩张承载的重要区域,而且还肩负着辽宁转变经济发展方式、加大产业结构调整的重要使命。在应用三轴图法研究辽宁沿海经济带产业结构的变化及其轨迹的基础上,利用SSM模型及其计算公式对辽宁沿海经济带产业结构进行比较分析,认为营口、丹东、锦州等城市的第一产业竞争力较强,其第二产业的发展水平都较高,尤以大连、营口两市为突出,锦州、营口两市的第三产业发展速度较快。依据分析结果并结合辽宁十二五经济社会发展战略,提出辽宁沿海经济带加快转变经济发展方式、加大产业结构调整的对策建议。  相似文献   

烟台经济开发区土地储备工作探讨          下载免费PDF全文

巩镇杰  田力  孙志高 《山东国土资源》2011,27(9):72-75

近年来,烟台经济开发区重视土地储备工作,从完善规章制度入手,对土地储备工作运行机制进行了规范。加强了土地资源的优化配置,实现了土地收益的最大化,有力的支持了当地经济的发展。但仍存在着一些不容忽视的问题,针对存在的问题进行了分析、探讨,并提出相应的对策建议。  相似文献   

COSMIC计划   总被引：10，自引：0，他引：10  

郭鹏  洪振杰  张大海 《天文学进展》2002,20(4):324-336

为了获得足够多的地面掩星点资料，用于全球和局部天气预报和大气研究，1997年中国台湾地区和美国联合制定了耗资1亿美元的COSMIC（Constellation Observing System for Meteorology，Ionosphere and Climate)计划。COSMIC是气象、电离层和气候星座观测系统，它包括卫星、地面数据接受和卫星控制站、数据分析中心和数字通讯网络，计划于2005年开始实施。介绍了COSMIC计划产出的历史背景、科学任务及其整个系统的组成，并针对COSMIC和其它LEO（低地球轨道）星座计划，提出了我们应做和正在做的研究工作。  相似文献