检索结果-南通市图书馆

有氧运动对冠状动脉支架术后患者血管内皮功能的影响

在线全文

学校读者我要写书评

暂无评论

岭南心血管病杂志 2020年第1期26卷 70-73页

作者：江文龙马华王迎梅程晶程芳洲深圳市盐田区人民医院

目的探讨有氧运动对冠状动脉支架术后患者血管内皮细胞功能的影响。方法收集深圳市盐田区人民医院2017年1月至2018年12月行冠状动脉支架植入治疗的患者78例,其中有氧运动组40例,对照组38例,对比两组干预前后一氧化氮(nitric oxide,NO)... 详细信息

目的探讨有氧运动对冠状动脉支架术后患者血管内皮细胞功能的影响。方法收集深圳市盐田区人民医院2017年1月至2018年12月行冠状动脉支架植入治疗的患者78例,其中有氧运动组40例,对照组38例,对比两组干预前后一氧化氮(nitric oxide,NO)、内皮素-1(endothelin-1,ET-1)浓度的变化。结果试验前,两组患者NO和ET-1浓度比较,差异均无统计学意义(P>0.05)。完成6周的有氧运动治疗后,有氧运动组患者的NO浓度明显高于干预前,差异有统计学意义[(13.29±3.42)pg/mL vs.(10.26±2.30)pg/mL,P<0.05];且显著高于对照组,差异有统计学意义[(13.29±3.42)pg/mL vs.(10.28±2.32)pg/mL,P<0.05]。完成6周的有氧运动治疗后,有氧运动组患者ET-1浓度明显低于干预前,差异有统计学意义[(54.87±4.52)pg/mL vs.(59.49±4.55)pg/mL,P<0.05];且显著低于对照组,差异有统计学意义[(54.87±4.52)pg/mL vs.(58.94±4.52)pg/mL,P<0.05]。结论有氧运动治疗可有效调节冠状动脉支架术后患者NO及ET-1浓度,从而改善血管内皮功能。

关键词：冠状动脉疾病有氧运动支架血管内皮功能内皮素-1

Precision micro-milling process:state of the art

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2021年第2期9卷 173-205页

作者： Lorcan O’Toole cheng-Wei Kang Feng-zhou fang Center of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublin 4Ireland State Key Laboratory of Precision Measuring Technology and Instruments Center of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China

Micro-milling is a precision manufacturing process with broad applications across the biomedical,electronics,aerospace,and aeronautical industries owing to its versatility,capability,economy,and efficiency in a wide range of *** particular,the micro-milling process is highly suitable for very precise and accurate machining of mold prototypes with high aspect ratios in the microdomain,as well as for rapid micro-texturing and micro-patterning,which will have great importance in the near future in bio-implant *** is particularly true for machining of typical difficult-to-machine materials commonly found in both the mold and orthopedic implant ***,inherent physical process constraints of machining arise as macromilling is scaled down to the *** leads to some physical phenomena during micromilling such as chip formation,size effect,and process *** dynamic physical process phenomena are introduced and discussed in *** is important to remember that these phenomena have multifactor effects during micro-milling,which must be taken into consideration to maximize the performance of the *** most recent research on the micro-milling process inputs is discussed in detail from a process output perspective to determine how the process as a whole can be ***,newly developed processes that combine conventional micro-milling with other technologies,which have great prospects in reducing the issues related to the physical process phenomena,are also ***,the major applications of this versatile precision machining process are discussed with important insights into how the application range may be further broadened.

关键词： Precision machining Micro-milling Size effect Deflection Runout Tool wear

苯磺酸左旋氨氯地平治疗2型糖尿病初发高血压38例的临床观察

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

内科 2009年第5期4卷 697-698页

作者：徐继建张江海程芳洲广东深圳市慢性病防治中心 518000 三九医药股份有限公司深圳市518029

目的观察苯磺酸左旋氨氯地平对2型糖尿病初发高血压控制的安全性和有效性。方法选择符合诊断标准的68例患者随机分A组38例,B组30例。在控制血糖的同时,A组使用苯磺酸左旋氨氯地平,B组用拜新同硝苯地平控释片治疗。。结果A组血压控制总... 详细信息

目的观察苯磺酸左旋氨氯地平对2型糖尿病初发高血压控制的安全性和有效性。方法选择符合诊断标准的68例患者随机分A组38例,B组30例。在控制血糖的同时,A组使用苯磺酸左旋氨氯地平,B组用拜新同硝苯地平控释片治疗。。结果A组血压控制总有效率达94.74%,血糖控制总有效率达97.37%,B组分别为86.67%和93.33%,两组差异无统计学意义(均P<0.05)。结论苯磺酸左旋氨氯地平能够有效地控制糖尿病初发高血压,并对糖尿病无不良影响。

关键词： 2型糖尿病高血压苯磺酸左旋氨氯地平拜新同硝苯地平控释片

在线全文

学校读者我要写书评

暂无评论

水平井固井滑套结构对起裂压力影响规律分析

科学技术与工程 2016年第36期16卷 6-12页

作者：江龙程远方周东现王怀栋李梦来张怀文中国石油大学(华东)石油工程学院青岛266580

在水平井无限级固井滑套分段压裂中,较高的起裂压力增加了压裂现场施工的难度和风险,是压裂施工遇到的主要问题之一。为有效降低起裂压力,以鄂尔多斯盆地无限级固井滑套压裂为工程背景,建立了地层-水泥环-压裂滑套耦合系统非线性有限元... 详细信息

在水平井无限级固井滑套分段压裂中,较高的起裂压力增加了压裂现场施工的难度和风险,是压裂施工遇到的主要问题之一。为有效降低起裂压力,以鄂尔多斯盆地无限级固井滑套压裂为工程背景,建立了地层-水泥环-压裂滑套耦合系统非线性有限元模型,分析了固井滑套长方形、斜向型、圆形孔口以及长方形孔口参数对压裂起裂压力的影响规律。结果表明,在地质力学参数相同条件下,3种孔口形状滑套的起裂压力均随孔口面积的增大而减小;而在孔口面积相同的条件下,长方形孔口比圆形和斜向型更能有效降低储层起裂压力。对于长方形孔口滑套,其宽度对降低起裂压力不明显;其孔口长度增加、数量增多、方位角减小对降低起裂压力十分明显;若孔口方位角不为零,会导致起裂位置变化,引起水力压裂起裂更为困难。

关键词：水平井固井滑套压裂耦合系统孔口形状参数起裂压力

Photoinduced small electron polarons generation and recombination in hematite

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1388-1395页

作者： cheng cheng Yonghao Zhu Zhaohui zhou Run Long Wei-Hai fang College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal University100875BeijingChina Chemical Engineering and Technology School of Water and EnvironmentChang’an University710064Xi’anChina

Polarons generally affect adversely the photochemical and photophysical properties of transition metal ***,the excited-state dynamics of polarons are not fully established to date and thus require an atomistic *** focus onα-Fe_(2)O_(3)with photoexcitation,electron injection,and heterovalent doping as the small polaron models,and conduct simulations of ab initio adiabatic molecular dynamics(AIMD)and nonadiabatic molecular dynamics(NA-MD).The elaborately designed AIMD simulations show that localization of electron at a single Fe site is an adiabatic and ultrafast process within sub-15 ***_(2)O_(3)doping with an electron or a Si and Ti dopant forms a localized electron polaron while photoexcitation forms localized electron and hole polarons simultaneously,leading to diverse electron–hole recombination ***-MD simulations demonstrate that recombination of an electron polaron created by doping with a delocalized hole at the valence band maximum ofα-Fe_(2)O_(3)takes place around 5 ps,while recombination between a pair of small electron and hole polarons in photoexcited Fe_(2)O_(3)delays to about 110 ps owing to weak NA coupling and fast decoherence *** ultrafast formation of small electron polarons inα-Fe_(2)O_(3)impedes the accumulation of delocalized holes in the valence band that directly participate in water oxidation at *** detrimental effect can be partially circumvented in photoexcited Fe_(2)O_(3)for slowing electron–hole recombination despite polarons may retain low charge *** findings provide a fundamental understanding of the excited-state dynamics of small electron polaron inα-Fe_(2)O_(3)and may help design efficient transition metal oxides photoanodes.

关键词： process polaron excited

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song Xie Zi-Meng Han Hao-cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li Qing-fang Guan Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

Precision wire electrochemical machining of thick structures in powder superalloy René88DT using a partially insulated tube electrode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2023年第4期11卷 618-635页

作者： cheng Tang Zhao Han Zhong-Qi zhou Xiao-Long fang Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and AstronauticsNanjing210016People’s Republic of China

Wire electrochemical machining(WECM)is a potential method for manufacturing macrostructures from difficult-to-cut materials,such as turbine slots,with good surface integrity and low *** this study,a novel tube electrode with array holes in the front and insulation in the back was applied using WECM to improve the machining precision and ***,assisted by an immersion electrolyte and axial flushing,the electrolyte-deficient gap was supplemented to achieve the cutting of a very thick *** simulation results indicated that this method could effectively reduce the machining gap and improve the uniformity of the electric-and flow-field *** verified that when the uninsulated range(machining angle)was reduced from 360°to 90°,the side machining gap was reduced from 462.5µm to 175µ***,using optimized machining parameters,array slits with gaps as small as(175±10)μm were machined on a powder superalloy René88DT sample with a thickness of 10 mm at a feed rate of 16µm/*** feasibility of fabricating complex profiles using this method was verified using a self-designed servo device.

关键词： Wire electrochemical machining(WECM) Tube electrode Partial insulation Machining angle Electrolyte flushing Surface quality

大蒜素对鼠缺血再灌注心肌过氧化物酶体增殖物激活受体α表达的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

心血管康复医学杂志 2005年第4期14卷 325-327页

作者：李俊明马业新程芳洲黄俊华中科技大学同济医学院附属同济医院心内科武汉430030

目的:探讨大蒜素对实验性大鼠缺血再灌注心肌梗死面积及过氧化物酶体增殖物激活受体α(PPAR α)表达的影响。方法:Wistar 大鼠70只被随机分为三组:假手术组(n=24) ,缺血再灌注组(n=24) ,大蒜素组(n=22) 。采用鼠心冠状动脉左前降支结扎... 详细信息

目的:探讨大蒜素对实验性大鼠缺血再灌注心肌梗死面积及过氧化物酶体增殖物激活受体α(PPAR α)表达的影响。方法:Wistar 大鼠70只被随机分为三组:假手术组(n=24) ,缺血再灌注组(n=24) ,大蒜素组(n=22) 。采用鼠心冠状动脉左前降支结扎法制作在体缺血再灌注模型,观察心肌梗死范围,运用半定量RT-PCR 方法对心肌PPAR αmRNA 的表达情况进行分析,运用Western-blotting 方法对检测PPAR 蛋白表达情况。结果:大蒜素组心肌梗死面积显著减少(P<0. 05) ,并且心肌PPAR αmRNA 及蛋白表达水平显著上调(P<0. 01) 。结论:大蒜素可显著减少实验性大鼠缺血再灌注后梗死面积及并使心肌中过氧化物酶体增殖物激活受体α(PPAR α)显著上调。

关键词：大蒜素过氧化物酶体增殖物激活受体α 心肌梗塞心肌再灌注

Formation of nanocrystalline graphite in polymer-derived SiCN by polymer infiltration and pyrolysis at a low temperature

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第6期10卷 1256-1272页

作者： Mingxing LI Laifei cheng fang YE Conglin ZHANG Jie zhou Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Poly technical UniversityXi'an 710072China

The microstructure of polymer-derived ceramics(PDCs)was closely related to *** study demonstrated that SiCN matrix prepared by polymer infiltration and pyrolysis(PIP)at 900℃ inside a Si_(3)N_(4) whisker(Si_(3)N_(4w))preform with submicro-sized pores differed from its powder-consolidated analogue in both the content and structure of free *** analysis showed that PIP process had a higher free carbon *** spectroscopy and transmission electron microscopy(TEM)observation discovered a higher graphitization degree of free carbon and the existence of nanocrystalline graphite in SiCN *** properties of Si_(3)N_(4w)/SiCN composites were greatly enhanced when volume fraction of SiCN matrix reached 24.5%due to dielectric percolation caused by highly-lossy free *** of hydrocarbon released during pyrolysis by gas-state carbonization in Si_(3)N_(4) whisker preform was supposed to account for the high yield and graphitization degree of free carbon in PIP process.

关键词： polymer-derived ceramics(PDCs) silicon carbonitride(SiCN) free carbon carbonization dielectric property