检索结果-南通市图书馆

Characteristics and genetic mechanism of the Mesoproterozoic rift system,Ordos Basin,China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy Geoscience 2024年第1期5卷 141-152页

作者： Meng Li Xiangbin Yan wei Zhang Yuanling guo Chaoying Liu Lingling Fan Shuang Yang Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Exploration and Development Research Institute SINOPEC North China CompanyZhengzhouHenan450006China

The Mesoproterozoic rifts are developed in the Ordos Basin located in the western margin of the North China *** on the latest 3D seismic data and previous research results,this study intends to discuss the zonal differential deformation characteristics and genetic mechanism of the Mesoproterozoic rifts in the Ordos ***-trending rifts are developed in the Mesoproterozoic in the south-central Ordos Basin,the main part of which are located near the western margin of the North China ***-trending rifts are developed in the north of the basin,while nw-Nnw rifts in the Mesoproterozoic in Hangjinqi *** genetic mechanism of the Mesoproterozoic rifts is related to regional extensional stress field,plate boundary conditions and internal preexisting *** main extensional stress direction strikes nww-SSE(120°)in the western margin of the North China Plate,based on the forward rift trend of the northern *** Hangjinqi area,the reactivation of the existing nwtrending wulansu fault and Nw.nw.trending Daolao fault,results in dextral shear stress *** boundary between the western margin of the North China Plate and its adjacent plates forms a nearly NS-trending preexisting basement tectonic belt,which intersects with the nww-SSE(120°)extensional stress at an acute angle of 60°.Therefore,the western margin of the North China Plate is formed by oblique normal faults under oblique *** to the long time span of Columbia Supercontinent breakup(1.8e1.6 Ga),the oblique rift in the south-central Ordos Basin is formed under the continuous oblique extension at the western margin of the North China Plate.

关键词： Columbia Supercontinent Ordos Basin Rift system Mesoproterozoic Genetic mechanism

The coupling control of biological precursors and environmental factors onβ-carotane enrichment in alkaline lacustrine source rocks:A case study from the Fengcheng formation in the western Junggar Basin,nw China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 836-854页

作者： Mao-guo Hou Ming Zha Hua Liu Hai-Lei Liu Jiang-Xiu Qu Ablimit Imin Xiu-Jian Ding Zhong-Fa Jiang School of Geosciences China University of PetroleumQingdaoShandong266580China Research Institute of Exploration and Development Xinjiang Petroleum Administration BureauKaramayXinjiang834000China

The organic-rich mudstones and dolostones of the Permian Fengcheng Formation(Fm.)are typically alkaline lacustrine source rocks,which are typified by impressively abundantβ-*** β-carotane has been well acknowledged as an effective indicator of biological sources or depositional ***,the specific biological sources of β-carotane and the coupling control of biological sources and environmental factors on the enrichment of β-carotane in the Fengcheng *** *** on a comprehensive investigation of the bulk,molecular geochemistry,and organic petrology of sedimentary rocks and the biochemistry of phytoplankton in modern alkaline lakes,we proposed a new understanding of the biological precursors of β-carotane and elucidated the enrichment mechanism of β-carotane in the Fengcheng *** results show that the biological precursors crucially control the enrichment of β-carotane in the Fengcheng *** haloalkaliphilic cyanobacteria are the primary biological sources of β-carotane,which is suggested by a good positive correlation between the 2-methylhopane index,7-+8-methyl heptadecanes/C_(max),C_(29%),and β-carotane/C_(max)in sedimentary rocks and the predominance of cyanobacteria with abundantβ-carotene in modern alkaline *** enrichment of β-carotane requires the reducing condition,and the paleoredox state that affects the enrichment of β-carotane appears to have a *** paleoclimate conditions do not considerably impact the enrichment of β-carotane,but they have some influence on the water's paleosalinity by affecting evaporation and *** it does not directly affect the enrichment of β-carotane in the Fengcheng Fm.,paleosalinity does have an impact on the cyanobacterial precursor supply and the preservation conditions.

关键词： β-carotane enrichment Cyanobacterial input Environmental impact Alkaline lacustrine source rocks The Fengcheng formation

Fault characteristics and their control on oil and gas accumulation in the southwestern Ordos Basin

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2024年第1期5卷 162-171页

作者： Yongtao Liu Shuanghe Dai Yijun Zhou Fufeng Ding Mingjie Li Xingyun Li Yu Zhao Binhua guo Tong Li Junan Han Research Institute of Oriental Geophysical Company CNPCXi'an710021China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an710069China Exploration Department of PetroChina Changqing Oilfield Company Xi'an710018China

3D seismic data recently acquired from the Ordos Basin shows three sets of regularly distributed fault systems,which overrides previous understanding that no faults were developed in this *** interpretation suggests that the faults in the southwestern Ordos Basin have three basic characteristics,namely extreme micro-scale,distinct vertical stratification,and regularity of planar *** NS-,nw-,and NE-trending fault systems developed in the Meso-Neoproterozoic e Lower Ordovician *** these,the NS-trending fault system mainly consists of consequent and antithetic faults which show clear syndepositional *** fault systems in the Carboniferous e Middle-Lower Triassic strata are not clear on seismic reflection *** nw-and NE-trending fault systems are developed in the Upper Triassic e Middle Jurassic *** these,the nw-trending fault system appears as a negative flower structure in sectional view and in an en echelon pattern in plan-view;they show transtensional deformation.A NE-trending fault system that developed in the Lower Cretaceous e Cenozoic strata shows a Y-shaped structural style and tension-shear properties.A comprehensive analysis of the regional stress fields at different geologic times is essential to determine the development,distribution direction,and intensity of the activity of fault systems in the Ordos *** exploration suggests three aspects in which the faults within the Ordos Basin are crucial to oil and gas ***,these faults serve as vertical barriers that cause the formation of two sets of relatively independent petroleum systems in the Paleozoic and Mesozoic strata respectively;this is the basis for the‘upper oil and lower gas’distribution ***,the vertical communication of these faults is favorable for oil and gas migration,thus contributing to the typical characteristics of multiple oil and gas fields within the basin,*** and gas reservoirs with multiple

关键词： Coherent attribute Strike-slip fault Flower structure Shale oil Ordos basin

Heterogeneously elevated branched-chain/aromatic amino acids among new-onset type-2 diabetes mellitus patients are potentially skewed diabetes predictors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

world Journal of Diabetes 2024年第1期15卷 53-71页

作者： Min wang Yang Ou Xiang-Lian Yuan Xiu-Fang Zhu Ben Niu Zhuang Kang Bing Zhang Anwar Ahmed guo-Qiang Xing Heng Su School of Chemical Science and Technology Yunnan UniversityKunming 650091Yunnan ProvinceChina Department of Endocrinology The First People’s Hospital of Yunnan ProvinceKunming 650032Yunnan ProvinceChina Clinical Laboratory Nanchong Central Hospital&The Second Clinical Medical College of North Sichuan Medical UniversityNanchong 637000Sichuan ProvinceChina Department of Preventive Medicine and Biostatistics Uniformed Services University of the Health SciencesBethesdaMD 20814United States The Affiliated Hospital and Second Clinical Medical College North Sichuan Medical UniversityNanchong 637000Sichuan ProvinceChina Department of Research and Development Lotus *** LLCGaithersburgMD 20878United States

BACKGROUND The lack of specific predictors for type-2 diabetes mellitus(T2DM)severely impacts early intervention/prevention *** branched-chain amino acids(BCAAs:Isoleucine,leucine,valine)and aromatic amino acids(AAAs:Tyrosine,tryptophan,phenylalanine)show high sensitivity and specificity in predicting diabetes in animals and predict T2DM 10-19 years before T2DM onset in clinical ***,improvement is needed to support its clinical *** To evaluate the effects of body mass index(BMI)and sex on BCAAs/AAAs in new-onset T2DM individuals with varying body *** Ninety-seven new-onset T2DM patients(weight(nw),n=33,BMI=22.23±1.60;overweight,n=42,BMI=25.9±1.07;obesity(OB),n=22,BMI=31.23±2.31]from the First People’s Hospital of Yunnan Province,Kunming,China,were ***-way and 2-way ANOVAs were conducted to determine the effects of BMI and sex on BCAAs/*** Fasting serum AAAs,BCAAs,glutamate,and alanine were greater and high-density lipoprotein(HDL)was lower(Pnw-T2DM patients,especially in male OB-T2DM ***,histidine,leucine,methionine,and lysine were greater in male patients than in female ***,histidine,alanine,glutamate,lysine,valine,methionine,leucine,isoleucine,tyrosine,phenylalanine,and tryptophan were significantly correlated with abdominal adiposity,body weight and BMI,whereas isoleucine,leucine and phenylalanine were negatively correlated with *** Heterogeneously elevated amino acids,especially BCAAs/AAAs,across new-onset T2DM patients in differing BMI categories revealed a potentially skewed prediction of T2DM *** higher BCAA/AAA levels in obese T2DM patients would support T2DM prediction in obese individuals,whereas the lower levels of BCAAs/AAAs in nw-T2DM individuals may underestimate T2DM risk in nw *** potentially skewed T2DM prediction should be considered when BCAAs/AAAs are to

关键词： Hyperaminoacidemia Branched-chain/aromatic amino acids New-onset type-2 diabetes Predictor Obesity Sex

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于深度学习的电商商品购买意图识别模型

运筹与管理 2024年第1期33卷 145-150页

作者：郭小宇马静南京航空航天大学经济与管理学院江苏南京211106

识别用户的购买意图是提升电子商务购买率(PR)的重要方法之一。针对用户购买意图不明确的现象,提出一种新模型。该模型将训练后的word2Vec(wV)词向量馈入卷积神经网络(CNN),通过深层语义模型(DSSM)进一步提取文本特征。在Keras框架下结... 详细信息

识别用户的购买意图是提升电子商务购买率(PR)的重要方法之一。针对用户购买意图不明确的现象,提出一种新模型。该模型将训练后的word2Vec(wV)词向量馈入卷积神经网络(CNN),通过深层语义模型(DSSM)进一步提取文本特征。在Keras框架下结合美国建材电商网站家得宝的真实搜索数据进行实证分析。结果表明,在五分类问题中,新模型在测试数据集上的F1-score达80.6%。新模型使用了word2Vec与CNN提取文本特征,并应用DSSM模型进一步提取了用户检索与商品描述文档在高维空间中的特征表示,最大化利用了用户检索与正确商品描述之间的语义相似度,同时避免了特征提取时主观因素的干扰,提高了商品购买意图的识别效果。

关键词：购买意图识别卷积神经网络深层语义模型深度学习

基于氯化物处理的钙钛矿自供电无电荷传输层光电探测器用于弱光检测

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第7期67卷 2193-2200页

作者：梁海霞张钧尧高玉山郭璞李立郭子亿吴岳黄佳 School of Materials Science and Engineering Tongji UniversityShanghai 201804China National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji UniversityShanghai 201804China

有机-无机卤化物钙钛矿因其可溶液加工和优异的光电特性而在光电探测器(PD)中得到了广泛应用.然而,基于钙钛矿的PD一般需要电荷传输层提供足够的分离和传输驱动力,这会增加钙钛矿PD的材料成本.本研究通过溶液法制备了基于苯基三甲基氯化... 详细信息

有机-无机卤化物钙钛矿因其可溶液加工和优异的光电特性而在光电探测器(PD)中得到了广泛应用.然而,基于钙钛矿的PD一般需要电荷传输层提供足够的分离和传输驱动力,这会增加钙钛矿PD的材料成本.本研究通过溶液法制备了基于苯基三甲基氯化铵(PTACl)处理的无电荷传输层钙钛矿自供电PD.以(CsFAMA)Pb(BrI)3作为光活性层,这种三元阳离子混合卤化物钙钛矿沉积后的垂直分布差异为电荷分离和传输提供了驱动力,PTACl处理能加强电荷分离和运输.这种PD在自供电模式下表现出优异的光电探测性能,其中光暗电流比为1.8×10^(5),响应度为198 mA w^(−1),探测率为1.48×10^(13)/1.24×10^(11) Jones(暗/噪声电流法计算).没有封装的PD在700 h的测试中也表现出良好的空气稳定性,且该PD对0.64 nw cm^(−2)的弱光仍有明显的响应,PD阵列也验证了这种弱光检测能力.本工作制备的钙钛矿自供电PD为弱光检测的发展提供了一种简单可行的途径.

关键词： photodetectors perovskites weak light detection charge transport layer free

Study and Application of Polarographic Catalytic wave of Chlordiazepoxide in the Presence of Persulfate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2002年第5期20卷 502-508页

作者： guo, w Lin, H Liu, LM guo, ZA Song, JF nw Univ Xian Dept Chem Xian 710069 Peoples R China Yuxi Normal Coll Dept Chem Yunnan 653100 Peoples R China

Polarographic catalytic wave of chlordiazepoxide in the presence of K 2S 2O 8 was studied in aqueous and DMF/H 2O mixed solutions. The results showed that a single reduction wave in alkaline medium was the reduction of the N=C bond in 1,2 position of chlordiazepoxide via an intermediate free radical in two one electron successive additions. when K 2S 2O 8 was present, the free radical of the N=C bond was oxidized to regenerate the original, producing a parallel catalytic wave of chlordiazepoxide. It was determined that the apparent rate constant k f of the oxidation reaction was 3.2×10 3 mol -1 ·L·s -1 . Using the catalytic wave the trace of chlordiazepoxide can be determined by linear potential scan polarography. In NH 3/NH 4Cl (pH 10.2±0.1, 0.12 mol/L)/K 2S 2O 8 (0.016 mol/L) supporting electrolyte, the second order derivative peak current of the catalytic wave was rectilinear to chlordiazepoxide concentration in the range of 3.20×10 -8 -1.60×10 -7 , 1.60×10 -7 -1.44×10 -6 and 1.44 ×10 -6 -1.44×10 -5 mol/L, respectively. The limit of detection was 9.0×10 -9 mol/L.

关键词： chlordiazepoxide persulfate polarographic catalytic wave free radical

在线全文

学校读者我要写书评

暂无评论

2019年南极长城站地区地震活动特征

地球物理学报 2024年第10期67卷 3814-3827页

作者：郭钊玥常利军中国地震局地球物理研究所北京100081

基于中国第35次南极科学考察期间完成改建的长城站地震台2019年记录的宽频带三分量连续波形数据,本文发展了一种交错网格搜索的单台定位方法并将其应用于长城站地区的地震定位研究,定位了35个信噪比较高的近震,获得了2019年南设得兰群... 详细信息

基于中国第35次南极科学考察期间完成改建的长城站地震台2019年记录的宽频带三分量连续波形数据,本文发展了一种交错网格搜索的单台定位方法并将其应用于长城站地区的地震定位研究,定位了35个信噪比较高的近震,获得了2019年南设得兰群岛及周边地区的地震分布图.结果显示,地震主要沿NE走向的南设得兰群岛分布,最大震级为M_(L)4.4,最小震级为M_(L)1.6,震源深度范围为12~115 km.通过该区域地震活动特征的分析可知,相对于稳定的南极大陆内部,长城站所在的南设得兰群岛及周边地区地震活动性较强,主要是由于该区域受到南极板块、南美板块和斯科舍板块直接或间接的作用所致.南设得兰群岛南部及其西侧靠近南设得兰海沟的弧前盆地分布着一些中源深度的地震,说明该区域受到板块俯冲作用的影响,这直接给出了菲尼克斯板块向南设得兰群岛下的俯冲作用仍然进行的地震学证据.布兰斯菲尔德海峡位于南设得兰群岛岛弧的弧后盆地,该区域仍然沿nwSE方向扩张,存在显著的火山活动和岩浆热液的运动,推测该区域发生的地震与火山活动有关.

关键词：长城站地震台地震定位地震活动板块俯冲火山活动

POLAROGRAPHIC CATALYTIC wAVE OF GLYCYRRHIZIC ACID

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1995年第4期6卷 321-324页

作者： Song, JF guo, w Du, H nw Univ Xian Inst Electroanalyt Chem Xian 710069 Peoples R China

A polarographic catalytic wave of glycyrrhizic acid( I) in the presence of H2O2 is described. The electrochemical process is considered to be that I yielded a free radical intermediate through a one-electron reduction of its C = C double bond, and the active intermediate was oxidized to regenerate I. The catalytic wave should be new-type one due to reduction and regeneration of organic depolarizer.

关键词： POLAROGRAPHIC CATALYTIC wAVE OF GLYCYRRHIZIC ACID