检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

葛根素治疗急性脑梗死的临床疗效观察

中国现代医药杂志 2007年第10期9卷 43-44页

作者：方润权广东省东莞市人民医院 523000

目的观察葛根素治疗急性脑梗死(ACI)的临床效果和安全性。方法将66例ACI患者随机分为治疗组和对照组各33例,两组均给予常规治疗,此外,治疗组加用葛根素治疗。结果①治疗组治疗前后的神经功能缺损程度评分差异有非常显著性意义(P<0.001)... 详细信息

目的观察葛根素治疗急性脑梗死(ACI)的临床效果和安全性。方法将66例ACI患者随机分为治疗组和对照组各33例,两组均给予常规治疗,此外,治疗组加用葛根素治疗。结果①治疗组治疗前后的神经功能缺损程度评分差异有非常显著性意义(P<0.001)。②治疗组的总有效率为84.9%,对照组的总有效率则为60.6%,两者比较差异有显著性(P<0.05),且未见明显副作用。结论葛根素治疗ACI安全、有效。

关键词：急性脑梗死葛根素疗效

葛根素对急性脑梗死患者血清IL-6和sICAM-1的影响

在线全文

学校读者我要写书评

暂无评论

白求恩军医学院学报 2007年第6期5卷 343-344页

作者：方润权广东省东莞市人民医院东莞523000

目的探讨葛根素对急性脑梗死(ACI)患者血清白介素-6(IL-6)和可溶性细胞间粘附分子-1(sICAM-1)的影响。方法66例ACI患者随机分为观察组和对照组。两组均给予常规治疗,观察组加用葛根素治疗2周。观察治疗前后血清IL-6和sI-CAM-1水平的变化... 详细信息

目的探讨葛根素对急性脑梗死(ACI)患者血清白介素-6(IL-6)和可溶性细胞间粘附分子-1(sICAM-1)的影响。方法66例ACI患者随机分为观察组和对照组。两组均给予常规治疗,观察组加用葛根素治疗2周。观察治疗前后血清IL-6和sI-CAM-1水平的变化,并与正常组比较。结果观察组及对照组治疗前血清IL-6和sICAM-1水平较正常组明显升高(P<0.001),治疗后明显降低(P<0.05),但仍高于正常组(P<0.01),其中观察组下降幅度较对照组大(P<0.001)。观察组及对照组治疗后神经功能缺损评分均较治疗前明显下降(P<0.05),观察组下降幅度更显著(P<0.001)。结论葛根素对脑缺血再灌注损伤有保护作用,其机制可能与抑制IL-6而降低sICAM-1水平有关。

关键词：脑梗死白介索.6 可溶性细胞间粘附分子-1 葛根素

Superior compound coatings prepared by low-temperature vanadium-nitrocarburizing duplex treatment

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1828-1835页

作者： Gen Jin fang-fang Xu Xun-Xun Hu Yue Xu School of Chemistry Beihang UniversityBeijing100191China Guobiao(Beijing)Testing and Certification Co. LtdBeijing100088China School of Materials Science and Engineering Beihang UniversityBeijing100191China

Superior compound coatings were prepared on CK45 steel surface by vanadium-nitrocarburizing duplex treatment in low-temperature salt *** this study,the microhardness,the phase constitution and the compositional distribution in the coatings prepared under different conditions were systematically *** results indicated that the reactions among activated vanadium,carbon and nitrogen atoms occurred on the steel surface,leading to the formation of compound coatings composed of outermost and compound *** mechanism for the formation of compound layer as well as the growth kinetics of the layer was also *** the duplex treatment,the wear and corrosion resistances of steel surface were significantly *** was found that the growth kinetics of compound layer obeyed the parabolic law,with the activation energy of 122.82 kJ·moL^(-1).

关键词： Vanadium-nitrocarburizing duplex treatment Compound coatings Microstructure Formation mechanism Growth kinetics

Control of Virtual Synchronous Generator for Frequency Regulation Using a Coordinated Self-adaptive Method

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第1期10卷 175-184页

作者： Hongwei fang Zhiwei Yu School of Electrical and Information Engineering and Key Laboratory of Tianjin Electric Power System Simulation and Control Tianjin UniversityTianjin 300072China

Power inverter adopting virtual synchronous generator(VSG)control can provide inertia support for distributed generation ***,it cannot take into account the dynamic regulation characteristics of ***,when the system encounters a sudden change in load or disturbance,the dynamic process of frequency regulation will be greatly *** view of this issue,an improved VSG control strategy based on a coordinated self-adaptive(CSA)method is *** time domain analysis method is used to study the influences of virtual inertia and damping parameter perturbation on the system steady and dynamic ***,in order to make the control strategy suitable for large load changes and suppress frequency variations beyond the limit,the secondary frequency modulation is introduced into the control *** the coordinated adaptive control of virtual inertia,virtual damping and frequency modulation,the dynamic performance of vSG frequency regulation can be obviously *** and experiment results have verified the effectiveness of the proposed CSA control strategy.

关键词： Coordinated self-adaptive method frequency regulation time domain analysis virtual synchronous generator

Microbe-induced gene silencing explores interspecies RNAi and opens up possibilities of crop protection

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

Science China(Life Sciences) 2024年第3期67卷 626-628页

作者： Rongxiang fang State Key Laboratory of Plant Genomics Institute of MicrobiologyChinese Academy of Sciencesand National Plant Gene Research CenterBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

In most eukaryotes, small RNA(sRNA)-mediated RNA silencing(or RNA interference, RNAi) is an evolutionarily conserved mechanism that regulates gene expression in a sequence-specific ***, s RNAs are produced by the RNase III enzymes Dicers and then incorporated into Argonaute(AGO) proteins to regulate gene expression by mRNA degradation.

关键词： protection conserved manner

A methodology for laser tool setters calibration and its precise mathematical model

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 564-581页

作者： Tao fang Zixi fang Ze Zhong CHEN Zhiyong CHANG School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Gina Cody School of Engineering and Computer Science Concordia UniversityMontrealQuebec H3G 1M8Canada Changsha Optimum CNC Corporation Changsha 410221China Institute for Aero-engine Smart Assembly of Shaanxi Province Xi’an 710072China

On-machine tool setting is a pivotal approach in achieving intelligent manufacturing,and laser tool setters have become a crucial component of smart machine *** tool setters play a crucial role in precisely measuring the dimensions of cutting tools during the part machining process,focusing on tool length and *** a measuring instrument,the positions of the laser axis of the laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration methods face challenges due to installation errors in the tool setter and geometric errors in the measuring *** address this issue,this study proposes a novel calibration ***,the calibration mechanism of the laser beam axis is *** on the accurate mathematical model of the laser beam and the measuring rod,and using the polygon clipping algorithm,the mathematical mechanism of the laser tool setter’s work is ***,a novel method is introduced to calculate the compensation distance between the laser beam reference point and the rod bottom center point at each moment during ***,by utilizing the kinematic chain of the tool setter calibration system,a new calibration method is developed to accurately calibrate the position of the laser beam axis in the machine tool coordinate ***,the accuracy of the calibration method is verified through simulation experiments and calibration *** method improves the calibration accuracy of the tool setter,and the mathematical model of the laser tool setter can be extended to the measurement of tools,thereby improving the precision of tool *** research significantly improves the efficient production performance of smart machine tools.

关键词： On-machine tool setting Smart machine tools Mathematical model Calibration method Laser tool sette

A disk I/O optimized system for concurrent graph processing jobs

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第3期18卷 13-29页

作者： Xianghao XU fang WANG Hong JIANG Yongli CHENG Dan FENG Peng fang School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Department of Computer Science&Engineering University of Texas at ArlingtonArlingtonTX 76019USA College of Computer and Data Science Fuzhou UniversityFuzhou 350108China Zhejiang Lab Hangzhou 311121China

In order to analyze and process the large graphs with high cost efficiency,researchers have developed a number of out-of-core graph processing systems in recent years based on just one commodity *** the other hand,with the rapidly growing need of analyzing graphs in the real-world,graph processing systems have to efficiently handle massive concurrent graph processing(CGP)***,due to the inherent design for single graph processing job,existing out-of-core graph processing systems usually incur unnecessary data accesses and severe competition of I/O bandwidth when handling the CGP *** this paper,we propose GraphCP,a disk I/O optimized out-of-core graph processing system that efficiently supports the processing of CGP *** proposes a benefit-aware sharing execution model to share the I/O access and processing of graph data among the CGP jobs and adaptively schedule the graph data loading based on the states of vertices,which efficiently overcomes above challenges faced by existing out-of-core graph processing ***,GraphCP adopts a dependency-based future-vertex updating model so as to reduce disk I/Os in the future *** addition,GraphCP organizes the graph data with a Source-Sorted Sub-Block graph representation for better processing capacity and I/O access *** evaluation results show that GraphCP is 20.5×and 8.9×faster than two out-of-core graph processing systems GridGraph and GraphZ,and 3.5×and 1.7×faster than two state-of-art concurrent graph processing systems Seraph and GraphSO.

关键词： graph processing disk I/O concurrent jobs

A low-frequency and broadband wave-insulating vibration isolator based on plate-shaped metastructures

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

Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1171-1188页

作者： Wei WEI Feng GUAN Xin fang College of Intelligent Science National University of Defense TechnologyChangsha410073China Naval Research Academy Beijing100161China

A metamaterial vibration isolator,termed as wave-insulating isolator,is proposed,which preserves enough load-bearing capability and offers ultra-low and broad bandgaps for greatly enhanced wave *** consists of plate-shaped metacells,whose symmetric and antisymmetric local resonant modes offer several low and broad mode bandgaps although the complete bandgap remains high and *** bandgap mechanisms,vibration isolation properties,effects of key parameters,and robustness to complex conditions are *** experimentally demonstrated,the wave-insulating isolator can improve the vibration insulation in the ranges of[50 Hz,180 Hz]and[260 Hz,400 Hz]by 15 dB and 25 dB,respectively,in contrast to the conventional isolator with the same first resonant frequency.

关键词： metamaterial and metastructure vibration isolation bandgap wave insulation plate

抗抑郁治疗对卒中后抑郁及神经功能康复的影响

在线全文

学校读者我要写书评

暂无评论

白求恩军医学院学报 2006年第3期4卷 148-150页

作者：方润权蓝瑞琼广东省东莞市人民医院神经内科东莞523000 广东省阳江仁济医院阳江529500

目的探讨氟西汀抗抑郁治疗对卒中后抑郁(PSD)患者的抑郁症状和神经功能康复的影响及其安全性。方法将91例PSD患者随机分为治疗组46例和对照组45例,两组同时应用脑血管病治疗药物,治疗组加用氟西汀治疗。采用汉密尔顿抑郁量表(HAMD)、日... 详细信息

目的探讨氟西汀抗抑郁治疗对卒中后抑郁(PSD)患者的抑郁症状和神经功能康复的影响及其安全性。方法将91例PSD患者随机分为治疗组46例和对照组45例,两组同时应用脑血管病治疗药物,治疗组加用氟西汀治疗。采用汉密尔顿抑郁量表(HAMD)、日常生活自理能力量表(Barthel指数记分)和神经功能缺损程度评定疗效和功能改善状况。结果治疗后治疗组HAMD量表减分率与对照组比较,差异有高度显著性(P<0.01),神经功能缺损程度积分值降低与Barthel评分提高,治疗组优于对照组(P<0.05和P<0.01)。治疗组抑郁症状改善的显效率和神经功能缺损改善的总有效率均显著高于对照组(P<0.001和P<0.05)。氟西汀的主要副反应为失眠、焦虑和恶心。结论氟西汀抗抑郁治疗能明显改善PSD患者的抑郁症状和神经功能,且副反应轻。

关键词：氟西汀脑卒中后抑郁抑郁状态神经功能