检索结果-南通市图书馆

Water flooding flowing area identification for oil reservoirs based on the method of streamline clustering artificial intelligence

在线全文

学校读者我要写书评

暂无评论

Petroleum Exploration and Development 2018年第2期45卷 328-335页

作者： jia hu DENG Lihui State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University Chengdu 610500China

For the case of carbonate reservoir water flooding development, the flow field identification method based on streamline modeling result was proposed. The Ocean for Petrel platform was used to build the plug-in that exported the streamline data, and the subsequent data was processed and clustered through Python programming, to display the flow field with different water flooding efficiencies at different time in the reservoir. We used density peak clustering as primary streamline cluster algorithm, and Silhouette algorithm as the cluster validation algorithm to select reasonable cluster number, and the results of different clustering algorithms were compared. The results showed that the density peak clustering algorithm could provide better identified capacity and higher Silhouette coefficient than K-means, hierachical clustering and spectral clustering algorithms when clustering coefficients are the same. Based on the results of streamline clustering method, the reservoir engineers can easily identify the flow area with quantification treatment, the inefficient water injection channels and area with developing potential in reservoirs can be identified. Meanwhile, streamlines between the same injector and producer can be subdivided to describe driving capacity distribution in water phase, providing useful information for the decision making of water flooding optimization, well pattern adjustment and deep profile modification.

关键词： water flooding water flooding efficiency flow field identification streamline simulation cluster algorithm artificial intelligence

基于岩浆汇聚区和上升通道特征的火山岩分布规律——以松辽盆地长岭断陷下白垩统营城组为例

在线全文

学校读者我要写书评

暂无评论

吉林大学学报（地球科学版） 2024年第2期54卷 429-446页

作者：胡佳王丽丽王立贤韩昊天陶鹏唐华风中国石油吉林油田分公司地球物理勘探研究院吉林松原138000 吉林大学地球科学学院长春130061

关于断陷尺度火山岩充填规律的全面认识,需要从深部岩浆汇聚区开始,到输导体系,再到其喷发分散,进行统一分析;但在研究过程中往往还是以单项分析为主,导致火山岩分布规律的认识不够全面。为了深入分析断陷盆地火山岩分布的规律,利用钻... 详细信息

关于断陷尺度火山岩充填规律的全面认识,需要从深部岩浆汇聚区开始,到输导体系,再到其喷发分散,进行统一分析;但在研究过程中往往还是以单项分析为主,导致火山岩分布规律的认识不够全面。为了深入分析断陷盆地火山岩分布的规律,利用钻井、地震资料和已有的深部结构研究成果,开展松辽盆地长岭断陷下白垩统营城组火山岩岩浆汇聚区和上升通道对火山岩分布特征的控制作用分析。取得如下认识:营城组火山岩在平面上呈现东西分带和南北分块的特征,在中央洼陷带集中分布;水平断距是火山岩是否发育的敏感参数,垂直断距对火山岩厚度影响更显著;断裂仅是火山岩发育的必要条件,非充分条件;火山岩分布还受软流圈上拱和地壳伸展减薄区域的约束;断陷盆地火山岩充填往往与沉降中心对应,当火山岩体积较小时烃源岩可以与火山岩组成好的生储组合,而当火山岩体积过大时会显著减少细粒沉积岩的沉积空间,不利于烃源岩在空间上延伸。

关键词：火山岩分布规律控制因素营城组白垩系松辽盆地

内型异莰烷基甲醛缩氨基硫脲类化合物的合成及抑菌活性

在线全文

学校读者我要写书评

暂无评论

林产化学与工业 2024年第1期44卷 105-110页

作者：丁清颖昌家宇肖转泉胡嘉王宗德陈尚钘江西农业大学林学院、国家林业草原木本香料(华东)工程技术研究中心、国家林业草原/江西省樟树工程技术研究中心江西南昌330045 江西师范大学化学化工学院江西南昌330022

以莰烯衍生物内型异莰烷基甲醛与氨基硫脲衍生物进行缩合反应,合成了5种缩氨基硫脲类化合物(3a~3e),并通过IR、MS、~1H NMR和^(13)C NMR等分析方法对其结构进行了表征。采用菌丝生长速率法测试了化合物3a~3e对水稻纹枯病菌等8种植物病... 详细信息

以莰烯衍生物内型异莰烷基甲醛与氨基硫脲衍生物进行缩合反应,合成了5种缩氨基硫脲类化合物(3a~3e),并通过IR、MS、~1H NMR和^(13)C NMR等分析方法对其结构进行了表征。采用菌丝生长速率法测试了化合物3a~3e对水稻纹枯病菌等8种植物病原菌的生长抑制作用,结果表明:5种化合物中,内型异莰烷基甲醛缩氨基硫脲(3a)对8种植物病原菌的抑制率最高,在质量浓度为50 mg/L时,3a对油茶炭疽病菌、枇杷炭疽病菌的抑制率分别为91.9%和97.2%,对油茶果生刺盘孢菌和彩绒革盖菌的抑制率均达100%,对水稻纹枯病菌、松枯梢病病原菌和西瓜枯萎病菌的抑制率分别为80.7%、79.8%、79.5%,均优于阳性对照样百菌清。

关键词：内型异莰烷基甲醛氨基硫脲缩合反应结构分析抑菌活性

社区居家养老服务利用对老年人医疗费用的影响研究

在线全文

学校读者我要写书评

暂无评论

中国初级卫生保健 2024年第8期38卷 5-9页

作者：戴季芬代涛胡佳北京协和医学院北京100730 中国医学科学院医学信息研究所北京100020 中国医学科学院卫生政策与管理研究中心北京100020

目的:分析各类社区居家养老服务利用对老年人医疗费用的影响,为完善社区居家养老服务,推动积极老龄化、健康老龄化的实现提供参考依据。方法:基于2018年中国老年健康长寿影响因素跟踪调查数据,采用多元线性回归和倾向得分匹配法分析各... 详细信息

目的:分析各类社区居家养老服务利用对老年人医疗费用的影响,为完善社区居家养老服务,推动积极老龄化、健康老龄化的实现提供参考依据。方法:基于2018年中国老年健康长寿影响因素跟踪调查数据,采用多元线性回归和倾向得分匹配法分析各类社区居家养老服务利用对老年人医疗费用的影响。结果:生活照料服务、医疗保健服务、精神文化服务和调解维权服务的利用率分别为12.21%、52.12%、24.12%和33.23%。多元线性回归分析结果显示,除各类社区居家养老服务外,老年人的城乡居住、年龄、自评健康、饮酒、每年体检、家庭年收入和过去两年内患重病次数是其医疗费用的显著影响因素。倾向得分匹配法分析结果显示,生活照料服务利用的平均处理效应值范围为0.685~0.803,医疗保健服务利用的平均处理效应值为0.405。结论:老年人对社区居家养老服务的利用率较低,生活照料服务利用和医疗保健服务利用会显著提升老年人的医疗费用,而精神文化服务利用和调解维权服务利用对老年人的医疗费用无显著影响。

关键词：老年人社区居家养老服务利用医疗费用倾向得分匹配法

经尿道膀胱肿瘤激光整块切除术与传统等离子电切术治疗NMIBC的术后复发率比较

在线全文

学校读者我要写书评

暂无评论

中华泌尿外科杂志 2024年第7期45卷 508-514页

作者：刘利龙刘征姚志鹏宋晓东宋文胡嘏李凡胡恒龙谌科华中科技大学同济医学院附属同济医院泌尿外科武汉430030

目的比较经尿道激光膀胱肿瘤整块切除术(ERBT)与传统经尿道膀胱肿瘤等离子电切术(TURBT)治疗非肌层浸润性膀胱癌(NMIBC)患者术后复发率的差异。方法回顾性分析2010年1月至2024年3月在华中科技大学同济医学院附属同济医院接受激光ERBT或T... 详细信息

目的比较经尿道激光膀胱肿瘤整块切除术(ERBT)与传统经尿道膀胱肿瘤等离子电切术(TURBT)治疗非肌层浸润性膀胱癌(NMIBC)患者术后复发率的差异。方法回顾性分析2010年1月至2024年3月在华中科技大学同济医学院附属同济医院接受激光ERBT或TURBT治疗的1439例NMIBC患者的临床资料。其中采用激光ERBT治疗201例(激光ERBT组),采用TURBT治疗1238例(TURBT组)。采用1:1倾向评分匹配(PSM),消除由于非随机分配而产生的选择偏倚,保证两组患者间的临床基线数据,如性别、年龄、病理诊断、T分期、肿瘤分级、肿瘤大小及肿瘤数量具有可比性。采用Kaplan-Meier法生成匹配后两组患者的无复发生存曲线,并通过log-rank检验比较组间差异。采用单因素和多因素Cox回归分析影响患者术后复发的独立危险因素。结果经过PSM后,两组各纳人193例患者,两组性别(P=0.317)、年龄(P=0.207)、病理类型(P=0.756)、T分期(P=0.402)、肿瘤分级(P=0.965)、肿瘤大小(P=0.821)、肿瘤数量(P=0.421)差异均无统计学意义。随访中位时间为16.2(8.0,33.9)个月。去除非尿路上皮肿瘤患者后,激光ERBT组180例,TURBT组184例。生存分析结果显示,激光ERBT组尿路上皮肿瘤患者的术后复发率低于TURBT组[20.0%(36/180)与38.6%(71/184),P30mm[14.0%(7/50)与52.0%(26/50),P=0.002]中均更低。在单发肿瘤患者中,激光ERBT组的复发率低于TURBT组[10.5%(11/105)与31.5%(35/111),P30mm较≤30mm者术后复发风险增加(HR=2.00,95%CI 1.31~3.05,P=0.001)。单发肿瘤较多发肿瘤患者术后复发风险显著降低(HR=0.50,95%CI 0.34~0.73,P30mm或多发膀胱肿瘤患者术后复发风险更高。

关键词：膀胱肿瘤癌非肌层浸润经尿道激光膀胱肿瘤整块切除术经尿道膀胱肿瘤电切术倾向评分匹配术后复发率

Dynamic modelling and robust current control of wind-turbine driven DFIG during external AC voltage dip

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

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第10期7卷 1757-1764页

作者： hu jia-bing HE Yi-kang Department of Electrical Engineering Zhejiang University Hangzhou 310027 China

Doubly-Fed Induction Generator （DFIG）, with vector control applied, is widely used in Variable-Speed Constant- Frequency （VSCF） wind energy generation system and shows good performance in maximum wind energy capture. But in two traditional vector control schemes, the equivalent stator magnetizing current is considered invariant in order to simplify the rotor current inner-loop controller. The two schemes can perform very well when the grid is in normal condition. However, when grid disturbance such as grid voltage dip or swell fault occurs, the control performance worsens, the rotor over current occurs and the Fault Ride-Through （FRT） capability of the DFIG wind energy generation system gets seriously deteriorated. An accurate DFIG model was used to deeply investigate the deficiency of the traditional vector control. The improved control schemes of two typical traditional vector control schemes used in DFIG were proposed, and simulation study of the proposed and traditional control schemes, with robust rotor current control using Internal Model Control （IMC） method, was carded out. The validity of the proposed modified schemes to control the rotor current and to improve the FRT capability of the DFIG wind energy generation system was proved by the comparison study.

关键词： Wind energy generation Variable-Speed Constant-Frequency (VSCF) Doubly-Fed Induction Generator (DFIG) Fault Ride-Through (FRT) Internal Model Control (IMC)

Transition metal anchored on C_(9)N_(4) as a single-atom catalyst for CO_(2) hydrogenation: A first-principles study

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第10期31卷 520-528页

作者： jia-Liang Chen hui-jia hu Shi-Hao Wei Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China Department of Electronic and Information Engineering School of Electrical Engineering and Computer ScienceNingbo UniversityNingbo 315211China

To alleviate the greenhouse effect and maintain the sustainable development, it is of great significance to find an efficient and low-cost catalyst to reduce carbon dioxide(CO_(2)) and generate formic acid(FA). In this work, based on the first-principles calculation, the catalytic performance of a single transition metal(TM)(TM = Cr, Mn, Fe, Co, Ni, Cu, Zn,Ru, Rh, Pd, Ag, Cd, Ir, Pt, Au, or Hg) atom anchored on C_(9)N_(4) monolayer(TM@C_(9)N_(4)) for the hydrogenation of CO_(2) to FA is calculated. The results show that single TM atom doping in C_(9)N_(4) can form a stable TM@C_(9)N_(4) structure, and Cu@C_(9)N_(4) and Co@C_(9)N_(4) show better catalytic performance in the process of CO_(2) hydrogenation to FA(the corresponding maximum energy barriers are 0.41 eV and 0.43 e V, respectively). The partial density of states(PDOS), projected crystal orbital Hamilton population(p COHP), difference charge density analysis and Bader charge analysis demonstrate that the TM atom plays an important role in the reaction. The strong interaction between the 3d orbitals of the TM atom and the non-bonding orbitals(1πg) of CO_(2) allows the reaction to proceed under mild conditions. In general, our results show that Cu@C_(9)N_(4) and Co@C_(9)N_(4) are a promising single-atom catalyst and can be used as the non-precious metals electrocatalyst for CO_(2) hydrogenation to formic acid.

关键词： first-principles calculation CO_(2)hydrogenation catalysts electronic structure reaction mechanisms reaction paths

An intelligent and privacy-enhanced data sharing strategy for blockchain-empowered Internet of Things

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2022年第5期8卷 636-643页

作者： Qinyang Miao hui Lin jia hu Xiaoding Wang College of Computer and Cyber Security Fujian Normal UniversityFuzhou350117China Engineering Research Center of Cyber Security and Education Informatization Fujian Province UniversityFuzhou350117China University of Exeter EX44RN ExeterUK

With the development of the Internet of Things(IoT),the massive data sharing between IoT devices improves the Quality of Service(QoS)and user experience in various IoT ***,data sharing may cause serious privacy leakages to data *** address this problem,in this study,data sharing is realized through model sharing,based on which a secure data sharing mechanism,called BP2P-FL,is proposed using peer-to-peer federated learning with the privacy protection of data *** addition,by introducing the blockchain to the data sharing,every training process is recorded to ensure that data providers offer high-quality *** further privacy protection,the differential privacy technology is used to disturb the global data sharing *** experimental results show that BP2P-FL has high accuracy and feasibility in the data sharing of various IoT applications.

关键词： Data sharing Federated learning Blockchain Privacy protection IoT

Effects of Bivalirudin and Unfractionated Heparin on Liver and Renal Function in Chinese Patients with Coronary Artery Disease Undergoing Coronary Angiography with/without Percutaneous Coronary Intervention

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

Journal of Clinical and Translational Hepatology 2021年第4期9卷 477-483页

作者： Qiaowei jia jia hu Wenfeng Ji Liansheng Wang Enzhi jia Department of Cardiovascular Medicine First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsuChina Department of Cardiovascular Medicine Liyang People’s HospitalLiyangJiangsuChina

Background and Aims:Unfractionated heparin(UFH)and bivalirudin are widely used as anticoagulants in cardiovascular medicine,including for thrombosis prevention during coronary angiography(CAG)and percutaneous coronary intervention(PCI).Little is known of the effects of UFH and bivalirudin on liver and kidney function in patients subjected to these *** study compared the effects of bivalirudin and UFH on liver/renal function in patients with coronary artery disease who underwent CAG,with or without ***:The study comprised 134 consecutive patients(40–89 years-old),who underwent CAG(or CAG and PCI);among them,66 and 68 patients were subject to,respectively,bivalirudin or *** following indicators of liver/renal function were measured before and after the procedures:plasma alanine aminotransferase(ALT),aspartate aminotransferase(AST),blood urea nitrogen,estimated glomerular filtration rate(eGFR),creatinine clearance,and serum *** were further stratified by severity of chronic kidney disease(CKD),based on original ***:Relative to baseline,in the bivalirudin group,ALT and AST were higher after CAG(p=0.005,0.025),while blood urea nitrogen and serum creatinine were lower(p=0.049,<0.001).In the UFH group,ALT,AST,eGFR,and creatinine clearance were lower after CAG(p≤0.001,all).Patients given bivalirudin with moderate or severe CKD,but not those with mild CKD,gained significant improvement in kidney ***:Relative to UFH,bivalirudin may better safeguard the renal function of patients with coronary artery disease who undergo CAG,especially patients with moderate-to-severe renal *** may cause less liver damage than bivalirudin.

关键词： Bivalirudin Unfractionated heparin Coronary artery disease Coro-nary angiography Percutaneous coronary intervention Liver function