检索结果-南通市图书馆

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

急性高原病的中西医非药物预防策略研究进展

中华危重病急救医学 2024年第6期36卷 669-672页

作者：李丽卢佩佩曹志文温博沈珊珊王子荣谭勇吕诚中国中医科学院中医临床基础医学研究所北京100700 北京市门头沟区中医医院脑病科北京102300 国家移民管理局后勤保障处北京100741

急性高原病(AHAD)是对高原低压缺氧环境适应不良出现的一系列临床反应的总称,轻者会发生头痛、恶心呕吐,重者则会出现肺水肿、脑水肿等危重情况,对人体造成致命性威胁。随着进入高原需求的增加,了解AHAD的常见预防措施可在一定程度上降... 详细信息

急性高原病(AHAD)是对高原低压缺氧环境适应不良出现的一系列临床反应的总称,轻者会发生头痛、恶心呕吐,重者则会出现肺水肿、脑水肿等危重情况,对人体造成致命性威胁。随着进入高原需求的增加,了解AHAD的常见预防措施可在一定程度上降低其发病率或致死率,对短期内旅居高原者大有裨益。近年来,人们的健康保健意识提高,对非药物预防疾病的关注度增加,同时非药物疗法防治高原病的疗效显著,引起了该领域研究人员的重视。本文撷取现代医学非药物预防策略,并着重从中医学角度出发,概括当前应对AHAD的非药物防治方法,以期服务于临床,降低AHAD的发病率,并改善预后。

关键词：急性高原病现代医学中医学预防策略非药物

Delay-constrained sleeping mechanism for energy saving in cache-aided ultra-dense network

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第8期62卷 131-144页

作者： Pei LI Shulei GONG shen GAO Yaoyue HU zhiwen PAN Xiaohu YOU National Mobile Communications Research Laboratory Southeast University Institute of Space-Terrestrial Intelligent Networks School of Electronic Science and EngineeringNanjing University China Mobile Group Jiangsu Co. Ltd.

We investigate an energy-saving sleeping mechanism in a cache-aided ultra-dense network(UDN)with delay constraints. As in existing works, we consider the video and file contents of the UDN. The video contents are cached at and delivered by a small-cell base-station(sBS). The cache-aided sBS cooperates with a macro-cell base-station(mBS) to service the file contents. The optimal sleeping strategy that conserves energy under the delay constraint is formulated as an energy-consumption minimization problem under the network stability condition with a guaranteed delay constraint. To find its solution, the minimization problem is transformed into a joint optimization problem of energy consumption and delay by the Lyapunov technique.A delay-constrained sleeping algorithm is proposed, and its effectiveness is confirmed by the numerical results of a simulation study. A tradeoff between energy consumption and delay, achieved by adjusting the weighting factor in the cache-aided UDN, is also demonstrated.

关键词： ultra-dense networks sleeping mechanism mean delay caching strategy energy saving

Exploring porous zeolitic imidazolate frame work-8(ZIF-8)as an efficient filler for high-performance poly(ethyleneoxide)-based solid polymer electrolytes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第8期13卷 2259-2267页

作者： zhiwen Lei Jinlai shen Weide Zhang Qingrong Wang Jun Wang Yonghong Deng Chaoyang Wang Research Institute of Materials Science South China University of TechnologyGuangzhou510640China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China Department of Materials Science and Engineering Academy for Advanced Interdisciplinary StudiesGuangdong Provincial Key Laboratory of Energy Materials for Electric PowerShenzhen518055China

Nano Research volume 13,pages2259–2267(2020)Cite this article 277 Accesses 1 Altmetric Metrics details Abstract The incorporation of inorganic fillers into poly(ethyleneoxide)(PEO)-based solid polymer electrolytes(SPEs)is well known as a low-cost and effective method to improve their mechanical and electrochemical *** zeolitic imidazolate framework-8(ZIF-8)is firstly used as the filler for PEO-based SPEs in this *** to the introduction of ZIF-8,an ionic conductivity of 2.2×10^−5 S/cm(30℃)is achieved for the composite SPE,which is one order of magnitude higher than that of the pure ***-8 also accounts for the broader electrochemical stability window and lithium ion transference number(0.36 at 60℃)of the composite ***,the improved mechanism of ZIF-8 to the composite SPE is investigated by zeta potential and Fourier transform infrared spectrograph *** stability at the composite SPE/lithium interface is greatly *** LiFePO4||Li cells using the composite SPE exhibit high capacity and excellent cycling performance at 60℃,i.e.,85%capacity retention with 111 mA·h/g capacity retained after 350 cycles at 0.5 *** comparison,the cells using the pure PEO show fast capacity decay to 74 mA·h/g maintaining only 68 *** results indicate that the PEO-based SPEs with ZIF-8 are of great promise for the application in solid-state lithium metal batteries.

关键词： zeolitic imidazolate framework inorganic fillers solid polymer electrolytes poly(ethyleneoxide) solid-state lithium metal batteries

Surface functionalized Pt/SnNb_(2)O_(6)nanosheets for visible-light-driven the precise hydrogenation of furfural to furfuryl alcohol

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 Energy Chemistry 2022年第3期31卷 566-575,I0015页

作者： Yingzhang Shi Huan Wang zhiwen Wang Cheng Liu Mingchuang shen Taikang Wu Ling Wu State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116FujianChina State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of ScienceFuzhou 350002FujianChina

Photocatalytic upgrading of renewable biomass is a promising way to relieve energy crisis and environmental ***,low photocatalytic efficiency and uncontrollable selectivity still limit its ***,ultrathin SnNb_(2)O_(6)nanosheets with high dispersed Pt nanoparticles(Pt/SN)were successfully developed as an efficient photocatalyst for the precise hydrogenation of furfural(FUR)to furfuryl alcohol(FOL)under visible light irradiation and exhibited the high conversion of FUR(99.9%)with the high selectivity for FOL(99.9%).It was revealed that SN with only 4.1 nm thickness possess good separation ability of photo-generated carriers and abundant surface Lewis acid sites(Nb^(5+))which would selectively chemisorb and activate FUR molecules via the Nb···O=C ***,Pt nanoparticles would gather photo-generated electrons for greatly promoting the generation of active H species to support the hydrogenation of FUR to *** synergistic effects between SnNb_(2)O_(6)nanosheets and Pt nanoparticles remarkably facilitate the photocatalytic performance for *** work not only confirms the great potential of ultrathin nanosheet photocatalyst with functional metal sites for precise upgrading of biomass but also provides an in-depth view to understand the surface/interface interaction between reactant molecules and surface sites of a photocatalyst.

关键词： Biomass conversion Hydrogenation of furfural Two-dimensional materials Sn2NbO6 nanosheet Pt nanoparticle Photocatalysis

在线全文

学校读者我要写书评

暂无评论

洞庭湖水文对流域干旱情势的响应及归因分析

水利水电技术（中英文） 2024年第5期55卷 60-70页

作者：刘志文申幸志钱湛姜恒李峰曾静耿明明田恬湖南省洞庭湖防洪及水资源保障工程技术研究中心湖南省水利水电勘测设计规划研究总院有限公司湖南长沙410007 中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室洞庭湖湿地生态系统观测研究站湖南长沙410125 湖南农业大学环境与生态学院湖南长沙410128

【目的】极端气候变化加剧了通江湖泊水文情势的波动性,亟需从流域视角探究流域干旱情势对通江湖泊水文环境的影响。【方法】以我国典型通江湖泊洞庭湖及洞庭湖流域为研究对象,选取2010—2020年及2022年极端干旱情景下洞庭湖流域5个代... 详细信息

【目的】极端气候变化加剧了通江湖泊水文情势的波动性,亟需从流域视角探究流域干旱情势对通江湖泊水文环境的影响。【方法】以我国典型通江湖泊洞庭湖及洞庭湖流域为研究对象,选取2010—2020年及2022年极端干旱情景下洞庭湖流域5个代表性气象水文站的降水量、温度、水位等数据,结合水文趋势分析、标准化降水指数(SPI)和回归分析等方法,对洞庭湖流域和湖泊的气象水文演变特征、干旱情势以及湖泊水位与流域干旱情势的响应关系进行了全面分析。【结果】结果表明,研究期间洞庭湖流域降水量呈小幅上升趋势,流域温度变化趋势不显著,但澧水流域温度总体较低,变化范围16.07~17.41℃。洞庭湖水位总体呈波动上升趋势,变化在23.63~25.81 m。洞庭湖流域SPI指数变化在-0.86~0.31,正常和轻旱年份占比分别为91%和9%。流域年内干旱情势总体呈先升后降变化趋势,正常和湿润等级频率分别变化在0.18%~0.64%和0.18%~0.36%。洞庭湖水位与流域降水和径流量呈显著正相关,与温度呈显著负相关。2022年洞庭湖水位呈先升后降变化趋势,6月达到年内水位最高值(30.45 m)后骤降。2022年1—6月洞庭湖流域干旱情势总体处于湿润和正常等级,后降至中旱和重旱等级。【结论】洞庭湖流域年际干旱情况多为正常年份,其余为轻旱年份。与多年月均水位相比,2022年极端干旱情景下洞庭湖水位峰值由往年7月提前至6月,随后水位骤降。此外,4月、5月、7月洞庭湖水位与流域SPI指数显著相关,反映了当前月份湖泊水位对流域干旱情势的深度响应,刻画了流域降水异常引起的洞庭湖“夏旱”特征。以上结果可为水文及农业部门应对气象灾害、实施农业生产保护措施等提供科学参考。

关键词：洞庭湖流域干旱降雨水位驱动机制

在线全文

学校读者我要写书评

暂无评论

基于说明书的国产辅助性治疗药物分析

医药导报 2020年第6期39卷 880-883页

作者：张伟张灵健贾敏沈智文宫健夫陆兴雨俞银杨丽萍孙凤一宫建辽宁成大生物股份有限公司质量保证部沈阳110026 沈阳药科大学药物流行病与临床药物评价课题组沈阳110016

目的分析国内辅助性治疗药物的特征,为促进辅助性治疗药物的合理使用提供参考依据。方法检索国家药品监督管理局网站、各地卫生健康委员会网站、中国知网、万方医学网、Pubmed、 Medscape等官方网站和数据库,收集辅助性治疗药物目录、... 详细信息

目的分析国内辅助性治疗药物的特征,为促进辅助性治疗药物的合理使用提供参考依据。方法检索国家药品监督管理局网站、各地卫生健康委员会网站、中国知网、万方医学网、Pubmed、 Medscape等官方网站和数据库,收集辅助性治疗药物目录、分类、生产企业、批准日期、不良反应、适应证治疗被推荐情况等信息,分析国内辅助性治疗药物的基本特征。结果共纳入辅助性治疗药物7个类别77种,包括代谢营养类28种、免疫增强类17种、基本营养素类15种、改善微循环类7种、质子泵抑制剂5种、保肝药4种、自由基清除剂1种。77种现代辅助性治疗药物共有生产企业2073家,60种(77.9%)药物的批准日期在2003年以前,药品说明书中提及不良反应数合计513个,其中质子泵抑制剂提及不良反应205个,每种平均41个;质子泵抑制剂对其药品说明书中所有适应证的治疗均被推荐使用。结论我国辅助性治疗药物的重复生产问题严重,多数药品说明书中不良反应信息可能不完善,需进一步对其临床应用的合理性开展药物流行病学调查。

关键词：辅助用药循证医学合理用药药物流行病质子泵抑制剂

A Neural Network Method for Monitoring Snowstorm: A Case Study in Southern China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2014年第5期24卷 599-606页

作者： MAO Kebiao MA Ying XIA Lang shen Xinyi SUN zhiwen HE Tianjue ZHOU Guanhua National Hulunber Grassland Ecosystem Observation and Research Station Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Guangzhou Institute of Geography Department of Geography University of Toronto Hydrometeorology and Remote Sensing Laboratory University of Oklahoma Institute No. 503 of China Academy of Space Technology School of Instrumentation Science and Opto-electronics Engineering Beijing University of Aeronautics & Astronautics

It has been observed that low temperature, rainfall, snowfall, frost have never occurred over the past 50 years in the southern China, and weather in this area is very complex, so the monitoring equipments are few. Optical and thermal infrared remote sensing is influenced much by clouds, so the passive microwave Advanced Microwave Scanning Radiometer-Earth Observing System （AMSR-E） data are the best choice to monitor and analyze the development of disaster. In order to improve estimation accuracy, the dynamic learn- ing neural network was used to retrieve snow depth. The difference of brightness temperatures of TB18.7v and ***, TBI8.7H and ***, TB23,sv and TB89v, TBz3.8H and TB89H are made as four main input nodes and the snow depth is the only one output node of neural network. The mean and the standard deviation of retrieval errors are about 4.8 cm and 6.7 cm relative to the test data of ground measurements. The application analysis indicated that the neural network can be utilized to monitor the change of snow intensity distribution through passive microwave data in the complex weather of the southern China.

关键词： snowstorm neural network snow depth passive microwave Advanced Microwave Scanning Radiometer-Earth Observing System (AMSR-E)

Tuning F-doped degree of rGO:Restraining corrosion-promotion activity of EP/rGO nanocomposite coating

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第9期44卷 121-132页

作者： Lu shen Yong Li Wenjie Zhao Kui Wang Xiaojing Ci Yangmin Wu Gang Liu Chao Liu zhiwen Fang Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of ScienceNingbo315201China Public Technology Service Center Ningbo Institute of Materials Technology and EngineeringChinese Academy of ScienceNingbo315201China Engineering Technology Research Center of Fluorocarbon Materials Shandong Zhongshan Photoelectric Materials Co.Ltd.Zibo255138China

Given that graphene features high electrical conductivity,it is a kind of material with corrosion-promotion *** study aimed to inhibit the corrosion-promotion activity of graphene in ***,we report an exciting application of epoxy matrix(EP)/F-doped reduced graphene oxide(rGO)coatings for the long-term corrosion protection of *** synthesized F-doped rGO(FG)did not reduce the utilization of rGO by a wide margin and possessed distinctive electrically insulating *** electrical conductivity of rGO was approximately 1500 S/m,whereas those of FG-1,FG-2 and FG-3 were 1.17,5.217×10^−2 and 3.643×10^-11 S/m,*** and rGO were then dispersed into epoxy *** chemical structures of rGO and FG were investigated by transmission electron microscopy(TEM),scanning probe microscopy(SPM),X-ray photoelectron spectroscopy(XPS),Fourier-transform infrared spectroscopy(FTIR),and X-ray diffraction(XRD).EP/FG coatings exhibited outstanding corrosion protection in comparison with blank EP and EP/rGO coatings mainly because the corrosion-promotion effect of rGO was *** anticorrosion ability of EP/FG coatingswasimproved with increased F-doped degree of *** addition,electrochemical impendance spectroscopy(EIS)results indicated that the Rc values of EP/FG-2 and EP/FG-3 were four orders of magnitude higher than those of EP/rGO in diluent NaCl solution(3.5 wt.%)after immersion for 90 days.

关键词： Graphene F-doped rGO Electrically insulating nanofillers Long-term anticorrosion

上海中心城区50岁以上人群心房颤动患病率调查及风险分析

在线全文

学校读者我要写书评

暂无评论

大连医科大学学报 2017年第3期39卷 237-241页

作者：俞帅张雁丁玎郭起浩赵倩华沈志文洪震王骏孙育民复旦大学附属静安区中心医院(筹)心内科上海200040 复旦大学附属华山医院神经病学研究所上海200040

目的获得上海市中心城区50岁以上人群心房颤动的患病率及其相关的危险因素。方法对社区50岁以上人群进行问卷调查及心电图检查,对其生活习惯、疾病史及房颤发病率进行统计。应用单因素和多因素Logistic回归分析房颤的危险因素。结果共... 详细信息

目的获得上海市中心城区50岁以上人群心房颤动的患病率及其相关的危险因素。方法对社区50岁以上人群进行问卷调查及心电图检查,对其生活习惯、疾病史及房颤发病率进行统计。应用单因素和多因素Logistic回归分析房颤的危险因素。结果共计入选50岁以上人群3804人。男性1691人,占总人群的44.4%。平均年龄(70.6±8.84)岁。调查明确诊断房颤患者130例,房颤患病率为3.42%,其中男性3.55%,女性3.31%,男女差异无统计学意义(P=0.69)。随着年龄的增长,无论男女,房颤的患病率逐渐升高。Logistic多因素回归分析显示,年龄(OR=1.05,95%CI 1.02-1.07)、既往有冠心病(OR=5.44,95%CI 3.60-8.22)或瓣膜病(OR=5.90,95%CI 2.36-14.77)为房颤的危险因素,P均<0.05。结论上海中心城区(静安区)50岁以上人群房颤患病率较高,高龄、冠心病或瓣膜病患者更易发生房颤。

关键词：流行病学心房颤动患病率调查