检索结果-南通市图书馆

Reliability and Validity Test of Questionnaire on the Adaptation Strategy of Cryosphere Changes in Arid Inland River Basin

引用

Meteorological and Environmental Research 2011年第4期2卷 1-4,8页

作者： wang ying-wei1,{1., deng mao-zhi2,3 1. school of applied meteorology, nanjing university of information science and technology, nanjing 210044, china 2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of sciences, Lanzhou 730000, china 3. State Key Laboratory of Cryospheric sciences, Chinese Academy of sciences, Lanzhou 730000, china

[Objective] The aim was to test the reliability and validity of questionnaire on the adaptation strategy of cryosphere changes in arid inland river basin. [Method] A questionnaire on 'the adaptation strategy of cryosphere changes in arid inland river basin' was carried out in Urumchi River basin and Aksu River basin, and its reliability and validity were tested by means of statistical method, so as to investigate the stability and accuracy of questionnaire. [Result] Reliability analysis of questionnaire showed that the split-half reliability coefficient of questionnaire in Urumchi River basin and Aksu River basin was 0.729 and 0.750, respectively, and Cronbach’s α reliability coefficient was 0.61. and 0.61., respectively, which revealed that the questionnaire had good equivalence and internal consistency which reflected good reliability and stability. According to validity analysis on questionnaire, there was significant correlation between the score of most questions and questionnaire, and it indicated that questionnaire had high content validity. There were 8 common factors collected from 26 questions, which were summarized as agricultural planting, agricultural water conservation, life satisfaction, cultivated land variation, social integration sense, climate and cryosphere changes, capital input improved by environment and family economic condition, respectively. Meanwhile, the contribution rate of various questions in corresponding indexes was higher, and reflected structure was in full accord with questionnaire content, which revealed that questionnaire owned good construct validity. [Conclusion] With higher stability and accuracy, the questionnaire could determine the desired topic and content and was suitable for the study on the perception of common people and choices of adaptive strategy under cryosphere changes in arid inland river basin in northwestern china.

关键词： Cryosphere changes Adaptive strategy Questionnaire Reliability and validity test china

来源：

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

Joint Effects of Multipollutant Mixtures on Mortality in Chengdu,china

引用

Biomedical and Environmental sciences 2024年第1期37卷 112-116页

作者： ZHANG ying TIAN Qi Qi HU Wen {1. ZHANG Shao Bo wang Shi Gong ZHENG Can Jun Plateau Atmosphere and Environment Key Laboratory of Sichuan Province School of Atmospheric SciencesChengdu University of Information TechnologyChengdu 610225SichuanChina Yunnan R&D Institute of Natural Disaster on Chengdu university of {1. technology Kunming 650034YunnanChina Chengdu Plain Urban meteorology and Environment Sichuan Provincial Field Scientific Observation and Research Station Chengdu 610225SichuanChina Chinese Center for Disease Control and Prevention National Institute for Communicable Disease Control and PreventionBeijing 102206China

Significant epidemiological research has revealed that exposure to air pollution is substantially associated with numerous detrimental health consequences^([1.3]).The negative health effects of individual air pollutants(e.g.,fine particulate matter:PM_(2.5);nitrogen dioxide:NO_(2);carbon monoxide,CO;or ozone:O_(3))have been widely explored^([4]).However,humans are constantly exposed to multipollutant mixtures in real life,and biological responses to inhaled pollutants are likely to depend on the interplay of pollutant ***,it is critical and imperative to explore the joint effects of multipollutant mixtures on human beings.

关键词： mixtures monoxide consequences

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Moisture‑Electric–Moisture‑Sensitive Heterostructure Triggered Proton Hopping for Quality‑Enhancing Moist‑Electric Generator

引用

Nano-Micro Letters 2024年第3期16卷 351-366页

作者： Ya’nan Yang Jiaqi wang Zhe wang Changxiang Shao Yuyang Han ying wang Xiaoting liu Xiaotong Sun Liru wang Yuanyuan Li Qiang Guo Wenpeng Wu Nan Chen Liangti Qu Key Laboratory of Cluster science Ministry of Education of ChinaKey Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Yangtze Delta Region Academy of Beijing Institute of technology Jiaxing 314019People’s Republic of China Department of Chemistry Key Laboratory of Organic Optoelectronics&Molecular EngineeringMinistry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Moisture-enabled electricity(ME)is a method of converting the potential energy of water in the external environment into electrical energy through the interaction of functional materials with water molecules and can be directly applied to energy harvesting and signal ***,ME can be unreliable in numerous applications due to its sluggish response to moisture,thus sacrificing the value of fast energy harvesting and highly accurate {1. ***,by constructing a moisture-electric-moisture-sensitive(ME-MS)heterostructure,we develop an efficient ME generator with ultra-fast electric response to moisture achieved by triggering Grotthuss protons hopping in the sensitized ZnO,which modulates the heterostructure built-in interfacial potential,enables quick response(0.435 s),an unprecedented ultra-fast response rate of 972.4 mV s^(−1.,and a durable electrical signal output for 8 h without any *** research provides an efficient way to generate electricity and important insight for a deeper understanding of the mechanisms of moisture-generated carrier migration in ME generator,which has a more comprehensive working scene and can serve as a typical model for human health monitoring and smart medical electronics design.

关键词： Moist-electric generators Grotthuss proton hopping Fast response Durable electrical output Personal health monitoring

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Scientific Advances and Weather Services of the china Meteorological Administration’s National Forecasting Systems during the Beijing 2022 Winter Olympics

引用

Advances in Atmospheric sciences 2024年第5期41卷 767-776页

作者： Guo deng Xueshun SHEN Jun DU Jiandong GONG Hua TONG Liantang deng zhifang XU Jing CHEN Jian SUN Yong wang Jiangkai HU Jianjie wang Mingxuan CHEN Huiling YUAN Yutao ZHANG Hongqi LI Yuanzhe wang Li GAO Li SHENG Da LI Li LI Hao wang ying ZHAO yinglin LI zhili liu Wenhua GUO china Meteorological Administration Earth System Modeling and Prediction Centre Beijing 100081China State Key Laboratory of Severe Weather China Meteorological AdministrationBeijing 100081China Key Laboratory of Earth System Modeling and Prediction China Meteorological AdministrationBeijing 100081China National Meteorological Center China Meteorological AdministrationBeijing 100081China Environmental Modeling Center/NCEP/NWS/NOAA College ParkMD 20740USA nanjing {1. of information science and technology Nanjing 210044China Institute of Urban meteorology China Meteorological AdministrationBeijing 100089China school of Atmospheric {1.s and Key Laboratory of Mesoscale Severe Weather/Ministry of Education Nanjing UniversityNanjing 210023China Tsinghua university Beijing 100084China

Since the Beijing 2022 Winter Olympics was the first Winter Olympics in history held in continental winter monsoon climate conditions across complex terrain areas,there is a deficiency of relevant research,operational techniques,and *** made providing meteorological services for this event particularly *** china Meteorological Administration(CMA)Earth System Modeling and Prediction Centre,achieved breakthroughs in research on short-and medium-term deterministic and ensemble numerical *** key technologies crucial for precise winter weather services during the Winter Olympics were developed.A comprehensive framework,known as the Operational System for High-Precision Weather Forecasting for the Winter Olympics,was *** of these advancements represent the highest level of capabilities currently available in *** meteorological service provided to the Beijing 2022 Games also exceeded previous Winter Olympic Games in both variety and *** included achievements such as the“1.0-meter level,minute level”downscaled spatiotemporal resolution and forecasts spanning 1.to 1. *** 30 new technologies and over 60 kinds of products that align with the requirements of the Winter Olympics Organizing Committee were developed,and many of these techniques have since been integrated into the CMA’s operational national forecasting *** accomplishments were facilitated by a dedicated weather forecasting and research initiative,in conjunction with the preexisting real-time operational forecasting systems of the *** program represents one of the five subprograms of the WMO’s high-impact weather forecasting demonstration project(SMART2022),and continues to play an important role in their Regional Association(RA)II Research Development Project(Hangzhou RDP).Therefore,the research accomplishments and meteorological service experiences from this program will be carried forward into forthcoming highimpact weather

关键词： Beijing Winter Olympic Games CMA national forecasting system data assimilation ensemble forecast bias correction and downscaling machine learning-based fusion methods

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhanced thermoelectric performance enabled by compositing ZrO_(2)in n-type SiGe alloy with low thermal conductivity

引用

Rare Metals 2024年第3期43卷 1167-1176页

作者： Meng-Fei wang Hua-Jun Lai Ji-Sheng Liang Jun-Liang Chen wang-Yang Ding Qi Zhou ying Peng Cheng-Yan liu Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Guangxi Academy of sciences Nanning530007China Key Laboratory of information Material Engineering Research Center of Electronic Information Materials and DevicesGuilin University of Electronic TechnologyMinistry of EducationGuilin541004China Guangxi Key Laboratory of Precision Navigation technology and Application School of Information and CommunicationGuilin University of Electronic TechnologyGuilin541004China

SiGe-based thermoelectric(TE)materials have gained increasing interests due to their low maintenance costs,environmental friendliness and long ***,the intrinsically high thermal conductivity of Si-based materials also results in poor TE *** this investigation,a zirconia(ZrO_(2))composite strategy was applied to an n-type SiGe alloy,tremendously elevating its TE *** mechanical allo{1. and spark plasma sintering(SPS)processes,the ZrO_(2)induced the formation of nanopores in the SiGe matrix via phosphorus ***,such increase in porosity enhanced the phonon scattering and dramatically suppressed lattice thermal conductivity,from 2.83 to 1.59 W·m^(-1.·K^(-1.at 873 ***,reduced phosphorus doping led to an increase in Seebeck coefficients and a relatively minor decrease in electrical conductivity,The power factor didn't deteriorate significantly,either,as its maximum of~3.43 mW·m^(-1.)K^(-2)was achieved at 873 K with(Si_(0.8)Ge_(0.2))_(0.097)P_(0.03)(ZrO_(2))_(0.003).In short,a peak figure of merit(ZT)of~1.27 at 873 K and an average ZT~0.7 from 323 to 873 K were *** study demonstrates that the electrical and thermal transportation of SiGe material can be synergistically tuned by compositing ZrO_(2),illustrating a novel strategy to optimize the TE properties of bulk materials.

关键词： Thermoelectric SiGe alloy ZrO2 composting P element adsorption nanopores

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

里德伯原子幻零波长

引用

物理学报 2024年第13期73卷 85-92页

作者：刘智慧刘逍娜何军刘瑶苏楠蔡婷杜艺杰王杰英裴栋梁王军民山西大学光电研究所量子光学与光量子器件国家重点实验室太原030006 山西大学物理电子工程学院太原030006 山西大学极端光学协同创新中心太原030006 航天恒星科技有限公司天地一体化信息技术国家重点实验室北京100095 中国船舶航海保障技术实验室天津300131 天津市量子精密测量技术重点实验室天津300131

原子极化率反映其对外场的响应特性,动态极化率等于零的外场波长称为零极化或幻零(tune-out)波长.里德伯原子的tune-out波长计算较为困难,本文设计室温气室里德伯原子测量装置,基于调幅电磁感应透明(amplitude modulation electromagnet... 详细信息

原子极化率反映其对外场的响应特性,动态极化率等于零的外场波长称为零极化或幻零(tune-out)波长.里德伯原子的tune-out波长计算较为困难,本文设计室温气室里德伯原子测量装置,基于调幅电磁感应透明(amplitude modulation electromagnetically induced transparency,AM-EIT)光谱技术实现tune-out波长测量.实验采用双光子级联激发制备铯原子里德伯态,利用阶梯型电磁感应透明(electromagnetically induced transparency,EIT)光谱实现里德伯原子量子态检测;通过微波频率连续扫描测量里德伯原子AM-EIT信号;在tune-out波长处,邻近耦合能级对目标里德伯态的动态极化为零,原子动态Stark效应相消,AM-EIT信号极弱.我们建立简化三能级模型计算tune-out波长,理论与实验结果基本符合.

关键词：里德伯原子铯原子电磁感应透明光谱幻零波长

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

静电悬浮加速度计关键技术剖析

引用

计算机工程与应用 2009年第34期45卷 67-70,73页

作者：宋仁旺陈琳英太原科技大学电子信息工程学院太原030024 太原科技大学应用科学学院太原030024

对静电悬浮加速度计的关键技术进行了分析,给出了结构参数、电容检测器的输出电压与位移的关系,分析了PID控制器的作用和残余气体的阻尼作用,导出了线加速度和角加速度的检测公式,指出了辐射计效应对加速度噪声有重要影响。

关键词：惯性传感器加速度计静电悬浮 PID控制器

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Projection Pursuit Clustering Model for Reservoir Flood Season Division

Projection Pursuit Clustering Model for Reservoir Flood Seas...

引用

2009中国控制与决策会议

作者： JIN Ju-liang~(1,2),deng Chao-xian~2,wang Yin-tang~3,liu Ke-lin~3,wang Zong-zhi~3,CHENG Liang~2 1.Chengdu Institute of Plateau meteorology,CM A,Chengdu 610072,china. 2.school of Civil Engineering,Hefei university of technology,Hefei 230009,china. 3.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,nanjing Hydraulic Research Institute,nanjing 210029,china.

＜正＞Reservoir flood season division is an important foundation for optimizing reservoir seasonal flood limit levels and safely utilizing flood *** order to achieve multi-dimension clustering,time sequence partition and subjective and objective information utilization of reservoir flood season division,a Projection Pursuit Clustering model for reservoir Flood Season Division（PPC-FSD） was established in this *** {1. results of PPC-FSD show that the first flood season,the main flood season and the last flood season of Panjiakou Reservoir of china are composed of from the first ten days of June to the first ten days of July,from the middle ten days of July to the middle ten days of August, and from the last ten days of August to the last ten days of September,*** first flood season,the main flood season and the last flood season of Miyun Reservoir of china are composed of from June 1. to June 30,from July 1.to August 1.,and from August 1. to September 1.,respectively;the physics mechanism analysis results of reservoir flood season can expediently be utilized by using projection index function of PPC-FSD,the optimal projection direction and partition point values of flood season can be obtained by using accelerating genetic *** optimal projection values express the integration relative membership function values of periods of time belonging to the fuzzy set of flood season,which can be used to design reservoir flood limit dynamic levels,and the optimal projection direction can be used to identify key indexes affecting reservoir flood season division based on matrix of index characteristic ***-FSD is visual,convenient and general,so it can be widely {1. to reservoir flood management.

关键词： management of flood disaster reservoir flood season division clustering analysis projection pursuit Panjiakou Reservoir Miyun Reservoir genetic algorithm

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Understanding synergistic catalysis on Pt–Cu diatomic sites via operando X-ray absorption spectroscopy in sulfur redox reactions

引用

escience 2024年第5期4卷 110-119页

作者： Shuai Xie Xingjia Chen Leilei wang Guikai Zhang Haifeng Lv Guolei Cai {1.-Rui Lu Ting-Shan Chan e Jing Zhang Juncai dong Hongchang Jin Xianghua Kong Junling Lu Song Jin Xiaojun Wu Hengxing Ji Hefei National Laboratory for Physical sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China school of Chemistry and Material {1.s CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in Nanoscience and Synergetic Innovation of Quantum Information and Quantum TechnologyUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical sciences at the Microscale Department of Chemical PhysicsSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Beijing Synchrotron Radiation Laboratory Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China National Synchrotron Radiation Research Center Hsinchu 300092China school of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009China

Sulfur redox reactions render lithium–sulfur(Li–S)batteries with an energy density of>500Whkg−1.but suffer a low practical capacity and fast capacity fade due to sluggish sulfur redox reaction(SRR)kinetics,which lies in the complex reaction process that involves a series of reaction intermediates and proceeds via a cascade ***,we present a Pt–Cu dual-atom catalyst(Pt/Cu-NG)as an electrocatalyst for sulfur redox ***/Cu-NG enabled the rapid conversion of soluble polysulfide intermediates into insoluble Li2S2/Li2S,and consequently,it prevented the accumulation and shuttling of lithium polysulfides,thus outperforming the corresponding single-atom catalysts(SACs)with individual Pt or Cu *** X-ray absorption spectroscopy and density functional theory calculations revealed that a synergistic effect between the paired Pt and Cu atoms modifies the electronic structure of the Pt site through d-orbital interactions,resulting in an optimal moderate interaction of the metal atom with the different sulfide *** optimal interaction enhanced charge transfer kinetics and promoted sulfur redox *** work thus provides important insights on the atomic scale into the synergistic effects operative in dual-atom catalysts and will thus pave the way to electrocatalysts with enhanced efficiency for high-performance Li–S batteries.

关键词： Dual-atom catalysts Sulfur redox reaction Lithium-sulfur batteries Synergistic interaction X-ray absorption spectroscopy

来源：

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

Economic Risk Analysis Method of Flood Control Engineering System Based on Stochastic Simulation of Triangular Fuzzy Numbers

Economic Risk Analysis Method of Flood Control Engineering S...

引用

2009中国控制与决策会议

作者： JIN Ju-liang~(1.2),FAN Qiu-ying~2,ZHANG Ming~3,ZHOU Yu-liang~2 1.Chengdu Institute of Plateau {1.,CMA,Chengdu 61.072,china. 2.school of Civil Engineering,Hefei university of technology,Hefei 230009,china. 3.College of Hydrology and Water Resources,Hohai university,nanjing 21.098,china.

＜正＞Economic risk analysis of flood control engineering system is very important in risk management of flood *** triangular fuzzy numbers theory was used to describe and deal with randomicity and fuzziness of economic risk system of flood control engineering,and the shortage and imprecision of datum *** order to deal with the difficulties of operations of triangular fuzzy numbers and their functions,Monte-Carlo method was used to simulate triangular fuzzy numbers,which can transform the operations of triangular fuzzy numbers and their functions into the conventional operations of real numbers,and then a new economic Risk Analysis Method for flood control engineering system based on Stochastic Simulation of Triangular Fuzzy Numbers,named RAM-SSTFN for short,was *** applied results of RAM-SSTFN show that economic benefit series of flood control engineering system can be simulated using Monte-Carlo method,that RAM-SSTFN can consider more complex things and give more exact computation results than the simple analysis methods of economic risk analysis of flood control engineering system,and that the common simple analysis methods {1.ld be used carefully in economic risk analysis of important regional flood control engineering system because their computation precision is not ***-SSTFN can be used to deal with less,imprecise, random and fuzzy information,so it can be widely applied to risk management of different uncertainties systems.

关键词： flood control system economic risk analysis triangular fuzzy numbers Monte-Carlo method risk management

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：