检索结果-南通市图书馆

Deformation characteristics and analog modeling of transtensional structures in the dongying Sag,Bohai Bay Basin

Frontiers of Earth Science 2024年第1期18卷 227-241页

作者： dawei dong Li ZHAO Weizhong ZHANG Jiyan LI Ruixiang ZHANG Jianlei YANG Guangzeng WANG Shandong Institute of Petroleum and Chemical Technology Dongying 257061China College of Resources and Environment Shandong Agriculture UniversityTai᾽an 271018China Geophysical Research Institute of Shengli Oilfield Branch Company SINOPECDongying 257022China Research Institute of Petroleum Exploration&Development Shengli Oilfield CompanySINOPECDongying 257000China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

Hydrocarbon exploration in the dongying Sag is constrained by the development of many Cenozoic transtensional structures with complex patterns and dynamic *** study uses seismic interpretation and analog modeling to investigate these transtensional *** results include dividing these transtensional structures into boundary fault,oblique rifting,and deep strike-slip fault controlled structures,according to the relationships between main and secondary *** developed in the steep slope zone,the central sag zone,and the slope zone,*** profile,the transtensional structures formed appear to be semi-flower-like,step-like,or *** plan-view,they appear to be broom-like,soft-linked,or en-echelon ***,these transtensional structures are controlled by the oblique normal slip of boundary faults,by the oblique extension of sub-sags,and by the later extension of deep strike-slip *** geometric deformation of these transtensional structures is controlled by the angles between the regional extension direction and the strike of boundary faults,deep faults,or sub-sags,where a larger angle corresponds to less developed transtensional ***,the transtensional structures in the dongying Sag were created by multi-phase and multi-directional extensions in the Cenozoic—which is also controlled by pre-existing *** strike of newborn secondary faults was determined by the regional extension direction and pre-existing structures.

关键词： transtensional structure seismic interpretation analogue modeling dynamic mechanism dongying Sag

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

Pore structure characteristics of low-rank coal reservoirs with different ash yields and their implications for recoverability of coalbed methane—a case study from the Erlian Basin, northeastern China

引用

Frontiers of Earth Science 2023年第1期17卷 18-29页

作者： dawei dong Jiaosheng YANG Qiujia HU Shitao CUI Fenjin SUN Jidong ZHANG Xinrui CUI Shandong Institute of Petroleum and Chemical Technology Dongying 257061China PetroChina Research institute of petroleum exploration and development Beijing 100083China Shanxi CBM Exploration and Development Branch PetroChina Huabei Oilfield CompanyChangzhi 046000China China National Logging Corporation Xi’an 710077China

Pores are the main accumulation sites and migration pathways for coalbed methane(also referred to as CBM).Pore structure restricts the content and recoverability of CBM from coal *** this study,12 representative coal samples with different ash yields that have similar tectonic characteristics and burial depths were collected from different mining areas in the Jiergalangtu and Huolinhe depressions in the Erlian *** samples were used to study the restrictions of ash yield on the characteristics of coal pore structures and the recoverability of CBM through macroscopic and microscopic structure observation,scanning electron microscope observations,vitrinite reflectance tests,low-temperature N2 adsorption,nuclear magnetic resonance(NMR),and micro-computed *** results show that coal reservoirs in the study area vary greatly in ash yield,based on which they can be divided into three types,i.e.,low-ash-content,ash-bearing,and high-ash-content coal *** addition,the ash yield has a certain impact on the development of coal pores;coal samples with lower ash yields indicate the presence of well-developed medium-large pores and better *** yield also has a certain impact on the brittleness of coal wherein a lower ash yield implies the development of brittle coal that is more liable to fracture as compared to less brittle samples at the same *** gas content also varies significantly with ash yield;a low ash yield impacts the gas saturation of ***,for coal reservoirs in the study area,their porosity,pore diameter,movable fluid porosity,adsorbed gas amount,and recoverability decrease as the ash yield increases.

关键词： coal reservoir ash pore structure recoverability Erlian 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

Increased retinal venule diameter as a prognostic indicator for recurrent cerebrovascular events:a prospective observational study

引用

Neural Regeneration Research 2024年第5期19卷 1156-1160页

作者： Ying Zhao dawei dong Ding Yan Bing Yang Weirong Gui Man Ke Anding Xu Zefeng Tan Department of Neurology and Stroke Center the First Affiliated Hospital of Jinan UniversityGuangzhouGuangdong ProvinceChina Clinical Neuroscience Institute the First Affiliated Hospital of Jinan UniversityGuangzhouGuangdong ProvinceChina Department of Neurology the First People’s Hospital of FoshanFoshanGuangdong ProvinceChina

Microvasculature of the retina is considered an alternative marker of cerebral vascular risk in healthy ***,the ability of retinal vasculature changes,specifically focusing on retinal vessel diameter,to predict the recurrence of cerebrovascular events in patients with ischemic stroke has not been determined *** previous studies have shown a link between retinal vessel diameter and recurrent cerebrovascular events,they have not incorporated this information into a predictive ***,this study aimed to investigate the relationship between retinal vessel diameter and subsequent cerebrovascular events in patients with acute ischemic ***,we sought to establish a predictive model by combining retinal veessel diameter with traditional risk *** performed a prospective observational study of 141 patients with acute ischemic stroke who were admitted to the First Affiliated Hospital of Jinan *** of these patients underwent digital retinal imaging within 72 hours of admission and were followed up for 3 *** found that,after adjusting for related risk factors,patients with acute ischemic stroke with mean arteriolar diameter within 0.5-1.0 disc diameters of the disc margin(MAD_(0.5-1.0DD))of≥74.14μm and mean venular diameter within 0.5-1.0 disc diameters of the disc margin(MVD_(0.5-1.0DD))of≥83.91μm tended to experience recurrent cerebrovascular *** established three multivariate Cox proportional hazard regression models:model 1 included traditional risk factors,model 2 added MAD_(0.5-1.0DD)to model 1,and model 3 added MVD0.5-1.0DD to model *** 3 had the greatest potential to predict subsequent cerebrovascular events,followed by model 2,and finally model *** findings indicate that combining retinal venular or arteriolar diameter with traditional risk factors could improve the prediction of recurrent cerebrovascular events in patients with acute ischemic stroke,and that retinal imaging c

关键词： acute ischemic stroke arteriolar cerebrovascular events diameter digital retinal imaging microvasculature prediction recurrent retina venular

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

α-Synuclein arginylation in the human brain

引用

Translational Neurodegeneration 2022年第1期11卷 654-666页

作者： Jun Zhao Buyan Pan Marie Fina Yun Huang Marie Shimogawa Kelvin C.Luk Elizabeth Rhoades EJames Petersson dawei W.dong Anna Kashina Department of Biomedical Sciences University of Pennsylvania School of Veterinary MedicinePhiladelphiaPennsylvania 19104USA Department of Chemistry University of Pennsylvania School of Arts and SciencesPhiladelphiaPennsylvania 19104USA Center for Neurodegenerative Disease Research Department of Pathology and Laboratory MedicineUniversity of Pennsylvania Perelman School of MedicinePhiladelphiaPennsylvania 19104USA.

Background: Alpha-synuclein (α-syn) exhibits pathological misfolding in many human neurodegenerative disorders. We previously showed that α-syn is arginylated in the mouse brain and that lack of arginylation leads to neurodegen-eration in mice. Methods: Here, we tested α-syn arginylation in human brain pathology using newly derived antibodies in combina-tion with Western blotting, biochemical assays, and experiments in live neurons. Results: We found that α-syn was arginylated in the human brain on E46 and E83, two sites previously implicated in α-syn pathology and familial cases of Parkinson’s disease. The levels of arginylation in different brain samples ranged between ~ 3% and ~ 50% of the total α-syn pool, and this arginylation nearly exclusively concentrated in the subcellu-lar α-syn fraction that sedimented at low centrifugation speeds and appeared to be simultaneously targeted by multi-ple posttranslational modifications. Arginylated α-syn was less susceptible to S129 phosphorylation and pathological aggregation in neurons. The arginylation level inversely correlated with the overall α-syn levels and with patient age, suggesting a possible causal relationship between arginylation decline and α-syn-dependent neuropathology. Conclusion: We propose that α-syn arginylation constitutes a potential neuroprotective mechanism that prevents its abnormal accumulation during neurodegeneration and aging in the human brain.

关键词： Arginylation Neurodegeneration Aging α-Synuclein

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

习近平总书记关于青年工作的重要思想的内在逻辑

引用

理论视野 2024年第6期292卷 39-44页

作者：董大伟中央团校党的青年运动史教研部

习近平总书记关于青年工作的重要思想的基本内涵集中体现为“七个明确”,蕴含着党对青年工作的地位作用、目标任务、职责使命、实践要求等多方面的深入思考。“七个明确”聚焦一个主题,同时又各有侧重,形成了严密的内在逻辑。其中,青年... 详细信息

习近平总书记关于青年工作的重要思想的基本内涵集中体现为“七个明确”,蕴含着党对青年工作的地位作用、目标任务、职责使命、实践要求等多方面的深入思考。“七个明确”聚焦一个主题,同时又各有侧重,形成了严密的内在逻辑。其中,青年工作的战略地位和中国青年运动的时代主题阐释其本体论与价值论,青年工作的职责使命、加强党对青年工作的领导、青年一代健康成长的正确道路、青年工作的路径方法和共青团改革发展的目标任务等建构了实践论。作为习近平新时代中国特色社会主义思想的“青年篇”,习近平总书记关于青年工作的重要思想也体现了“六个必须坚持”的立场、观点和方法。

关键词：党的青年工作重要思想内在逻辑

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

基于计算机网络技术的物流信息化建设

引用

物流技术 2013年第11期32卷 461-463页

作者：董大伟吉林工商学院吉林长春130052

首先分析了物流信息化建设的关键技术和需求,之后对物流信息化建设中的主要模块设计进行了探讨,并针对目前我国物流信息化建设中存在的一些问题提出了解决对策。

关键词：计算机网络物流企业信息化

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

一种高精度基准源电路

引用

电子技术应用 2015年第6期41卷 45-46,50页

作者：董大伟中国电子信息产业集团有限公司北京100086

基于90 nm CMOS标准工艺,设计了一种低温漂的带隙基准源电路。一种结构新颖的温度曲率校正电路被采用,作为一级温度补偿电路的曲率校正电路。Hspice仿真结果表明:所设计电压源在温度-20℃^+120℃范围内,平均温度系数约为2.2 ppm/℃,获... 详细信息

基于90 nm CMOS标准工艺,设计了一种低温漂的带隙基准源电路。一种结构新颖的温度曲率校正电路被采用,作为一级温度补偿电路的曲率校正电路。Hspice仿真结果表明:所设计电压源在温度-20℃^+120℃范围内,平均温度系数约为2.2 ppm/℃,获得了一个低压高精度的带隙基准电压源。

关键词：带隙基准源温度系数曲率校正

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

内燃机轴系扭振阻尼系数的识别

引用

西南交通大学学报 2014年第6期49卷 1084-1089页

作者：华春蓉董大伟闫兵西南交通大学机械工程学院四川成都610031

为了解决内燃机轴系扭振理论分析中阻尼系数难以选取的问题,提出了一种利用轴系角振动模态阻尼比识别轴系各主要部件扭振阻尼系数的方法.该方法将轴系多质量系统简化成当量扭摆系统,利用扭振能量理论推导了轴系角振动模态阻尼比与轴系... 详细信息

为了解决内燃机轴系扭振理论分析中阻尼系数难以选取的问题,提出了一种利用轴系角振动模态阻尼比识别轴系各主要部件扭振阻尼系数的方法.该方法将轴系多质量系统简化成当量扭摆系统,利用扭振能量理论推导了轴系角振动模态阻尼比与轴系各部件扭振阻尼系数的关系式.如果已知轴系角振动模态阻尼比,通过分析轴系扭振阻尼特性,并选择合适的轴系角振动模态,即可识别出对轴系扭振起主要作用的阻尼系数.对某6缸和4缸柴油机的仿真和试验研究表明,所识别的轴系部件扭振阻尼系数的最大误差为4.89%,也证明了本文方法的正确性.

关键词：内燃机轴系扭振阻尼系数模态阻尼比

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

基于小波变换的盆地沉积-构造波动分析

引用

吉林大学学报（地球科学版） 2015年第4期45卷 1227-1236页

作者：赵利李理董大伟中国石油大学(华东)地球科学与技术学院山东青岛266580

波动分析是一种定量研究盆地沉积-构造演化的方法。本文分析了滑动窗口法在盆地沉积波动分析数理方法中的诸多不足,采用小波变换的多尺度分解思想对研究区19个点处的信号做了处理,方法是使用db4小波对沉积速率直方图做Level9次分解。结... 详细信息

波动分析是一种定量研究盆地沉积-构造演化的方法。本文分析了滑动窗口法在盆地沉积波动分析数理方法中的诸多不足,采用小波变换的多尺度分解思想对研究区19个点处的信号做了处理,方法是使用db4小波对沉积速率直方图做Level9次分解。结果表明:以东营凹陷616-2点为例做沉积波动分析发现,通过小波变换可以获得能量波(A)、次能量波(n)、沉积演化波(g)和高频波(l)四个分解波,其中周期波n、g、l的周期分别是91、50、14 Ma;平面对比各分解波发现,能量波反映的是盆地沉积的整体趋势和盆内某点的平均沉积速率,次能量波反映的是盆地构造演化周期和断陷结构,沉积演化波反映的是板块聚敛控制下的盆地沉积-剥蚀演化,沉积干涉波反映的是盆地多尺度周期波叠加所呈现的地层沉积速率;空间尺度波动分析表明,一期构造运动会在空间内产生一个特定的构造波,而多个构造波在空间内会有规律地相互干涉,即产生多期构造叠加。

关键词：小波变换分解波波动分析沉积盆地东营凹陷

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

AStudyofProbabilisticBalancingQualityofaMulti┐CylinderEngine

引用

Journal of Modern Transportation 1996年第1期13卷 51-60页

作者： dong dawei Tan Daming School of Mechanical Engineering, Southwest Jiaotong University,Chengdu 610031,China

This paper presents a method which uses a random model and adopts the Monte Carlo simulation method to analyze the randomness of the actual balan... 详细信息

This paper presents a method which uses a random model and adopts the Monte Carlo simulation method to analyze the randomness of the actual balancing quality of a multi cylinder *** uncertainties considered in the analysis are the reciprocating mass,rotating mass,connecting rod length,crank radius and crank phase angle of individual crank *** to the calculated results with respect to inertia forces and couples,the regularities of probabilistic balancing quality are discussed in detail,and some views are offered.

关键词： balancing quality probabilistic analysis multi cylinder engine

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：