检索结果-南通市图书馆

Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep-water of the Qiongdongnan Basin,Northern South China Sea

引用

Acta Geologica Sinica(English Edition) 2021年第1期95卷 259-267页

作者： YOU Li XU Shouli MAO Xuelian zhong Jia JIAO Yaoqi XIONG xiaofeng Chinese National Offshore Oil Limited Corporation(Zhanjiang) ZhanjiangGuangdong 524057China

Due to its structure,rock and mineral composition,fluid and other factors,the granite Buried Hill Reservoir is highly heterogeneous with a complex longitudinal structure and a reservoir space made up of a combination of dissolution pores and fractures.This paper is based on current understanding of tectonic evolution in the northern part of the South China Sea,in conjunction with the seismic phase characteristics.It is determined that the meshed fault system was formed by three stages of movement-tectonic compression orogeny during the Indochinese epoch,strike-slip compression-tension during the Yanshanian Period,early fracture extension activation during the Himalayan-which controlled the distribution of the Buried Hill Reservoir.Drilling revealed two types of buried hills,faulted anticline and fault horst,their longitudinal structure and the reservoir space type being significantly different.The mineral composition,reservoir space and diagenetic characteristics of the reservoir rocks and minerals were analyzed by lithogeochemistry,micro section and logging etc.,it thus being determined that the Mesozoic rocks of the Songnan Low Uplift in the Qiongdongnan Basin are mainly composed of syenogranite,granodiorite,monzogranite,which is the material basis for the development of the Buried Hill Reservoir.The content of felsic and other brittle minerals is more than 70%,making it easy for it to be transformed into fractures.At the same time,the weathering resistance of granodiorite and monzogranite is weaker than that of syenogranite,which is easily weathered and destroyed,forming a thick sand gravel weathering zone.With increasing depth of burial,weathering and dissolution gradually weaken,the deep acidic fluid improving the reservoir property of internal fractures and expanding the vertical distribution range of the reservoirs.The research results lay a foundation for the exploration of Buried Hill in the deep-water area of the Qiongdongnan Basin.

关键词： granite buried hill weathering structure deep-water genetic mechanism Qiongdongnan Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

辽中凹陷西斜坡古近系东三段湖底扇发育模式及大油田发现

引用

岩性油气藏 2024年第2期36卷 33-42页

作者：牛成民惠冠洲杜晓峰官大勇王冰洁王启明张宏国中海石油(中国)有限公司天津分公司天津300459

通过地层层序研究、古地貌恢复、锆石测年和地震资料分析等,从物源体系、古地貌、坡折体系和湖平面变化等方面探讨了辽中凹陷西斜坡古近系东营组三段(东三段)湖底扇的发育模式,并对油气藏的特征及成藏模式进行了研究。研究结果表明:(1)... 详细信息

通过地层层序研究、古地貌恢复、锆石测年和地震资料分析等,从物源体系、古地貌、坡折体系和湖平面变化等方面探讨了辽中凹陷西斜坡古近系东营组三段(东三段)湖底扇的发育模式,并对油气藏的特征及成藏模式进行了研究。研究结果表明:(1)辽中凹陷西斜坡东三段湖底扇砂体表现为“物源-坡折带-湖平面”控制的富砂模式;物源主要来自燕山褶皱带,其次为辽西凸起,大规模的物源供给和变质岩的母岩区为湖底扇的形成提供了碎屑物质和优质的储集砂体;沉积坡折带控制湖底扇重力流卸载位置,断裂坡折带形成的微古地貌变化控制局部砂体搬运方向和差异富集程度;湖平面变化与物源体系变化耦合形成的三角洲、湖泊和湖底扇沉积在空间上反复叠置发育,为岩性圈闭的形成提供了良好的保存条件。(2)旅大10-6油田湖底扇岩性主要为中—细粒长石岩屑砂岩,颗粒粒度较小,以重力流沉积为主;孔隙类型主要为原生粒间孔和溶蚀粒间孔,见少量粒内溶孔,孔隙发育一般,连通性较差;湖底扇发育具有垂向上多期叠置、平面上连片的特征,位于斜坡中部的中扇亚相具有明显的滑塌变形构造,是最有利的勘探相带。(3)旅大10-6油田湖底扇油藏是辽中凹陷西斜坡从构造圈闭勘探转为岩性圈闭勘探的重大发现,实现了渤海油田斜坡带古近系湖底扇型岩性油气藏勘探领域的重大突破,共发育11个油藏和9个气藏,油气藏相互独立、储量规模大、丰度高,探明油当量为3000×10^(4)t,原油物性好、探井测试产能高,为“汇聚脊-通源断层-顺向砂体”三元耦合成藏模式。

关键词：湖底扇古地貌坡折体系沉积模式油气成藏模式斜坡带东营组三段古近系辽中凹陷

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Equalization of Ti 6Al 4V alloy welded joint by scanning electron beam welding

引用

中国有色金属学会会刊：英文版 1999年第3期9卷 535-540页

作者： Chen xiaofeng(陈晓风) Han zhong(韩忠) Lou Xinfang(楼新芳) Hu Chuanshun(胡传顺) Sun Changyi(孙长义) Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

The equalization of Ti 6Al 4V alloy welded joint with base metal on corrosion resistance, strength and ductility was studied. The solidification microstructure is transformed from 650 μm columnar grains to 100 μm equiaxed grains by scanning electron beam welding. The anodic polarization curve of 150 μm equiaxed grains coincides with that of base metal. Equal corrosion resistance between weld metal and base metal was obtained. Uniform microstructure and solute distribution are the basis of equalization. Corrosion rate of weld with 150 μm equiaxed grains is the lowest, 2.45 times lower than that of 650 μm columnar grains. Weld strength is 98% as much as that of base metal, yield strength ratio is 99.5%, which is 3.6% higher than that of base metal.

关键词： scanning electron beam welding titanium alloy welding equalizationDocument code: A

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

When and How to Adjust Non-Pharmacological Interventions Concurrent with Booster Vaccinations Against COVID-19—Guangdong,China,2022

引用

China CDC weekly 2022年第10期4卷 199-206,I0002-I0012页

作者： Guanhao He Fangfang Zeng Jianpeng Xiao Jianguo Zhao Tao Liu Jianxiong Hu Sicong Zhang Ziqiang Lin Huaiping Zhu Dan Liu Min Kang Haojie zhong Yan Li Limei Sun Yuwei Yang Zhixing Li Zuhua Rong Weilin Zeng Xing Li Zhihua Zhu xiaofeng Liang Wenjun Ma Guangdong Provincial Center for Disease Control and Prevention Guangzhou CityGuangdong ProvinceChina Department of Public Health and Preventive Medicine School of MedicineJinan UniversityGuangzhou CityGuangdong ProvinceChina Disease Control and Prevention Institute Jinan UniversityGuangzhou CityGuangdong ProvinceChina Guangdong Provincial Institute of Public Health Guangdong Provincial Center for Disease Control and PreventionGuangzhou CityGuangdong ProvinceChina BNU-HKBU United International College Zhuhai CityGuangdong ProvinceChina Department of Psychiatry School of MedicineNew York UniversityNew York CityNew YorkUnites States Laboratory of Mathematical Parallel Systems(LAMPS) Department of Mathematics and StatisticsYork UniversityToronto CityOntarioCanada Jinan University-BioKangtai Vaccine Institute Jinan UniversityGuangzhou CityGuangdong ProvinceChina

Introduction:With the large-scale roll-out of the coronavirus disease 2019(COVID-19)booster vaccination effort(a vaccine dose given 6 months after completing primary vaccination)in China,we explore when and how China could lift non-pharmacological interventions(NPIs)against COVID-19 in 2022.Methods:Using a modified susceptible-infectiousrecovered(SIR)mathematical model,we projected the COVID-19 epidemic situation and required medical resources in Guangdong Province,China.Results:If the number of people entering from overseas recovers to 20%of the number in 2019,the epidemic in 2022 could be controlled at a low level by a containment(215 local cases)or suppression strategy(1,397 local cases).A mitigation strategy would lead to 21,722 local cases.A coexistence strategy would lead to a large epidemic with 6,850,083 local cases that would overwhelm Guangdong’s medical system.With 50%or 100%recovery of the 2019 level of travelers from overseas,the epidemic could also be controlled with containment or suppression,but enormous resources,including more hotel rooms for border quarantine,will be required.However,coexistence would lead to an uncontrollable epidemic with 12,922,032 local cases.Discussion:With booster vaccinations,the number of travelers from overseas could increase slightly in 2022,but a suppression strategy would need to be maintained to ensure a controllable epidemic.

关键词： maintained Guangdong overseas

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A novel complex-system-view-based method for system effectiveness analysis: Monotonic indexes space

引用

Science in China(Series F) 2006年第1期49卷 90-102页

作者： HU Jianwen ZHANG Weiming LIU zhong HU xiaofeng SI Guangya C^4ISR Architecture Technology LAB National University of Defense Technology Changsha 410073 China Strategy Simulation Teaching Department National Defense University Beijing 100091 China

Based on the characteristics of the complex system, this paper presents a novel method, the monotonic indexes space method, for the effectiveness analysis of the complex system. First, it presents some basic concepts and assumption such as the monotonic indexes space, monotonic indexes requirement locus, etc. Second, based on the assumption that indexes are monotonic for the requirements, an algorithm is proposed and applied to numerical approximation of monotonic indexes requirement locus with hyperboxes. Third, this paper proposes two algorithms for acquiring intersection of several monotonic indexes requirement locus. Fourth, this paper proposes the monotonic-indexspace based system analysis model such as the system evaluation model, the sensitivity analysis model for indexes. Based on the practical requirement, the concept of fuzzy monotonic indexes requirement locus and the corresponding analysis model are introduced. Finally, this paper applies the above-mentioned models to analyze the effectiveness of a notional anti-stealth-air-defense information system. And the outputs show that the method is promising.

关键词： effectiveness analysis monotonic indexes space monotonic indexes requirement locus fuzzy effectiveness analysis.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative Analysis of Influence Factors on Arable Land Use Intensity at Farm Household Level:A Case Study Comparing Suyu District of Suqian City and Taixing City,Jiangsu Province,China

引用

Chinese Geographical Science 2012年第5期22卷 556-567页

作者： LU Xiao HUANG Xianjin zhong Taiyang ZHAO xiaofeng CHEN Yingxue GUO Shuiqiong School of Geographic and Oceanographic Sciences Nanjing University Nanjing 210093 China School of Geography and Tourism QuJu Normal University Qufu 273165 China Jiangsu Engineering CenterJbr Land Development and Consolidation Technology Nanjing 210093 China School of Government Nanjing University Nanjing 210093 China

Using data from the farm household survey conducted in 2009,arable land use intensity(ALUI)and its influence factors at farm household level were investigated by the Tobit model.Suyu District of Suqian City and Taixing City of Jiansu Province,China were chosen as the regions for comparison.The results show that:1)On the average, the ALUI,labor intensity,yield-increasing input,and labor-saving input are 15 238.14 yuan(RMB)/ha,192 d/ha, 7233.01 yuan/ha,and 2451.32 yuan/ha in the less economically developed Suyu District,and 13 020.65 yuan/ha,181 d/ha,5871.82 yuan/ha,and 2625.97 yuan/ha in more economically developed Taixing City.The figures indicate that Suyu District has higher ALUI and labor intensity input but lower labor-saving input.2)Comparing all the influence factors,the total arable land area in available and average plot size have bigger effects on arable land intensive use;to a small degree,family′s non-farm income affects labor intensity,yield-increasing input,and labor-saving input;the yield-increasing input decreases significantly when the householder has higher education attainment;the commercialization rates of agricultural products and the planting proportion of cash crops both have unstable influence on ALUI; the share of arable land rented in has few impacts on labor intensity,yield-increasing input,and labor-saving input. 3)There are no differences found in the internal impact mechanism of influence factors on the arable land intensive use behaviors of farm households.However,there are conspicuous disparities in the impact degrees and statistical significance based on varying economic levels.4)Using the results as bases,this study proposes that the government should implement land management and agricultural policies according to local condition.And these policies should decrease land fragmentation to promote scale management of land and arable land use intensification.

关键词：土地利用强度耕地利用影响因素泰兴市宿迁市江苏省农户中国

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于社区参与理念的横琴粤澳深度合作区突发公共卫生事件应对新模式探索

引用

中国公共卫生 2024年第1期40卷 125-128页

作者：赵金利欧阳吟靖王心达钟海波练雁飞李立华吴智君李晓凤郭智慧卞骏业张伟杰李心一彭雯昕李骏邹华春珠海市横琴新区疾病预防控制中心珠海519000 广东省人民政府横琴粤澳深度合作区工作办公室社会事务局珠海519000 中山大学公共卫生学院(深圳) 深圳518107 中山大学国际关系学院珠海519082 复旦大学公共卫生学院上海200032

横琴地处珠海南端,与澳门地区一水一桥之隔,具有粤澳合作的先天优势,是促进澳门地区经济适度多元发展的重要平台。横琴粤澳深度合作区重点发展文旅会展商贸产业,对外开放程度高,人口流动大、交通往来频繁,因此,增强合作区突发公共卫生... 详细信息

横琴地处珠海南端,与澳门地区一水一桥之隔,具有粤澳合作的先天优势,是促进澳门地区经济适度多元发展的重要平台。横琴粤澳深度合作区重点发展文旅会展商贸产业,对外开放程度高,人口流动大、交通往来频繁,因此,增强合作区突发公共卫生事件应对能力尤为重要。本文基于社区参与理念,通过概述社区参与定义、社区参与在突发公共卫生事件应对中的作用及合作区发展社区参与模式的优势,探索合作区突发公共卫生事件应对新模式。

关键词：突发公共卫生事件社区参与应对模式

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recent Advances in Carbon Nanodots:Properties and Applications in Cancer Diagnosis and Treatment

引用

Journal of Analysis and Testing 2019年第1期3卷 37-49页

作者： xiaofeng Li Lihong Shi Lin Li Chuan Dong Chen-zhong Li Shaomin Shuang School of Chemistry and Chemical Engineering Institute of Environmental ScienceShanxi UniversityTaiyuan 030006ShanxiChina Taiyuan University TaiyuanShanxi 030012China Nanobioengineering/Bioelectronics Laboratory Department of Biomedical EngineeringFlorida International University10555 West Flagler StreetMiamiFL 33174USA

Cancer is a serious threat to human health.Survival rates of cancer patients are highly dependent on the early diagnosis and treatment.Carbon nanodots(CDs),a rising star of carbon nanomaterial family,can be developed as a promising terrace for cell labeling,bioimaging,drug delivery,diagnosis,and therapy by virtue of many superior properties including unique photo-luminescence properties,low toxicity,excellent biocompatibility,and easy functionalization.In this mini review,we present the recent progress in fundamental properties of CDs,and highlight their bioapplications in cancer diagnosis and treatment.

关键词： Carbon nanodots Photoluminescence Cancer Diagnosis Treatment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Vertically aligned reduced graphene oxide/Ti_(3)C_(2)T_(x)MXene hybrid hydrogel for highly efficient solar steam generation

引用

Nano Research 2020年第11期13卷 3048-3056页

作者： Wei Li xiaofeng Li Wei Chang Jing Wu Pengfei Liu Jianjun Wang Xi Yao zhong-Zhen Yu State Key Laboratory of Organic-Inorganic Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China Institute of Chemistry Chinese Academy of SciencesBeijing100190China Department of Biomedical Sciences City University of Hong KongHong Kong999077China Beijing Key Laboratory of Advanced Functional Polymer Composites Beijing University of Chemical TechnologyBeijing100029China

Effective utilization of abundant solar energy for desalination of seawater and purification of wastewater is one of sustainable techniques for production of clean water,helping relieve global water resource shortage.Herein,we fabricate a vertically aligned reduced graphene oxide/Ti_(3)C_(2)T_(x)MXene(A-RGO/MX)hybrid hydrogel with aligned channels as an independent solar steam generation device for highly efficient solar steam generation.The vertically aligned channels,generated by a liquid nitrogen-assisted directional-freezing process,not only rapidly transport water upward to the evaporation surface for efficient solar steam generation,but also facilitate multiple reflections of solar light inside the channels for efficient solar light absorption.The deliberate slight reduction endows the RGO with plenty of polar groups,decreasing the water vaporization enthalpy effectively and hence accelerating water evaporation efficiently.The MXene sheets,infiltrated inside the A-RGO hydrogel on the basis of Marangoni effect,enhance light absorption capacity and photothermal conversion performance.As a result,the A-RGO/MX hybrid hydrogel achieves a water evaporation rate of 2.09 kg·m^(−2)·h^(−1)with a high conversion efficiency of 93.5%under 1-sun irradiation.Additionally,this photothermal conversion hydrogel rapidly desalinates seawater and purifies wastewater to generate clean water with outstanding ion rejection rates of above 99%for most ions.

关键词： anisotropic hydrogel MXene reduced graphene oxide solar steam generation aligned channels

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On opportunistic spectrum efficiency in cognitive radio systems

引用

High Technology Letters 2009年第2期15卷 170-174页

作者：王鹏 zhong xiaofeng Xiao Limin Zhou Shidong Wang Jing Bai Yong State Key Laboratory on Microwave and Digital Communications Tsinghna National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing 100084 P.R. China DoCoMo Beijing Communications Laboratories Compary Limited Beijing 100080 P.R. China

The performance bound of cognitive radio systems is analyzed.We use opportunistic spectrum effi-ciency(OSE)as the performance metric,and point out that the maximum achievable OSE can be used toevaluate the maximum value that the introduction of secondary users can add to the conventional wirelesssystems.Based on assumptions of the PU s traffic model and some reasonable approximations,the ex-pression of OSE is obtained and the maximum achievable OSE is derived by solving an optimization prob-lem.The results are verified by computer simulation.

关键词：无线电系统频谱效率证券交易所计算机模拟性能约束性能指标无线系统交通模式

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：