检索结果-南通市图书馆

Science china(Information Sciences) 2011年第1期54卷 146-152页

作者： yang tianchi1,yu chaoqun2.wang tianpeng1 & jin liang1 1national digital switching system engineering and technological research center, Zhengzhou 450002.{2. 2.urveying and Mapping College of Information engineering University, Zhengzhou 450002.{2. 1. national digital {2. system engineering and technological research center Zhengzhou 450002 China2. Surveying and Mapping College of Information Engineering University Zhengzhou 450002 China

A target position can be estimated using position information from scattered signals in the nonline-of-sight propagation environment in a single observer location *** is always an error in the final estimated result of the position obtained using scatter signals because measurement noise is *** reduce the total error of the system,we propose a method of converting the problem of optimizing location into a one of solving the extremes of the *** the problem of how to solve the extremes of the constraints is converted into an unconstrained problem by using the constrained total least squares(CTLS) ***,the Newton iteration method is used to obtain the optimized *** results also verify the capability of this method.

关键词： scatter position disturbing VOCTLS single observer location Newton iteration

Generation of electricity from CO_2.mineralization: Principle and realization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(technological Sciences) 2014年第12期57卷 2335-2346页

作者： XIE He Ping wang yu Fei HE {2. GOU Ma Ling LIU Tao wang jin Long TANG liang JIANG Wen ZHANG Ru XIE Ling Zhi liang Bin center of CO2.Mineralization and CCUS Sichuan University College of Water Resource & Hydropower Sichuan University Institute for Nanobiomedical Technology and Membrane Biology Regenerative Medicine Research Center West China HospitalWest China Medical School Sichuan University State Key Laboratory of Biotherapy/Collaborative Innovation center of Biotherapy Wets China Hospital Sichuan University College of Chemical engineering Sichuan University

Current CO2.reduction and utilization technologies suffer from high energy consuming. Thus, an energy favourable route is in urgent demanding. CO2.mineralization is theoretically an energy releasing process for CO2.reduction and utilization, but an approach to recovery this energy has so far remained elusive. For the first time, here we proposed the principle of harvesting electrical energy directly from CO2.mineralization, and realized an energy output strategz1 for CO2.utilization and reduction via a CO2.mineralization fuel cell （CMFC） system. In this system CO2.and industrial alkaline wastes were used as feedstock, and industrial valuable NaHCO3 was produced concomitantly during the electricity generation. The highest power density of this system reached 5.5 W/m2. higher than many microbial fuel cells. The maximum open circuit voltage reached 0.452.V. Moreo- ver, this system was demonstrated viable to low concentration CO2.（10%） and other carhonation process. Thus, the existing of an energy-generating and environmentally friendly strategy to utilize CO2.as a supplement to the current scenario of CO2.emis- sion control has been demonstrated.

关键词： CO2.mineralization electricity generation sodium bicarbonates CO2.utilization

维普期刊数据库

Rational Fabrication of Superhydrophobic Nanocone Surface for Dynamic Water Repellency and Anti-icing Potential

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic engineering 2019年第1期16卷 27-37页

作者： yuehan Xie Haifeng Chen Yizhou Shen Jie Tao Mingming jin yu Wu Wenqing Hou College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Chemistry Qiuzhen SchoolHuzhou UniversityHuzhou 313000China School of Materials Science and engineering Nanyang Technological UniversityNanyang Avenue 50 Singapore 639798Singapore Jiangsu Collaborative Innovation center for Advanced Inorganic Function Composites Nanjing Tech University Nanjing 210016China

In this work,a simple and economic route was presented to fabricate an anti-icing superhydrophobic surface with nanocone structures,which were constructed only by one-step facile method of hydrothermal treatment with zinc acetate on the aluminum *** modifying with fluoroalkylsilane (FAS-17),the nanocone structures with the appropriate size could induce the high superhydrophobicity with the water contact angle reaching 160.2. ± 0.4° and the sliding angle only being 1 ° ± 0.5°.Under the dynamic environments,the impact droplets could rapidly bounced off the surface with the shorter contact time of^1 0.6 ms,and it was mainly attributing to lower capillary adhesive force (water adhesion force of 4.1 μN) induced by the open system of nanocone ***,the superhydrophobic nanocone surfaces were verified to be a promising anti-icing/icephobic materials,on which the water droplets needed to spend the time of ~517 s to complete the entire freezing process at-10 ℃,displaying the increased ~50 times of icing-delay performance comparing with untreated *** if ice finally was formed on the superhydrophobic nanocone surfaces,it could be easily removed away with lower ice adhesion of^45 *** repeatable measurement of ice adhesion strength on the same place of the superhydrophobic surface is still far less than the surface ice adhesion of smooth substrate,exhibiting better stability.

关键词： superhydrophobic nanocone dynamic water repellency anti-icing potential

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

曲线独柱型钢塔精准安装关键技术

公路交通科技 2022年第12期39卷 125-133页

作者：周畅田雨金李亮南京市公共工程建设中心江苏南京210000 中交二航局第四工程有限公司安徽芜湖241000

独柱钢塔斜拉桥结构新颖,相较于多塔肢结构,独柱钢塔截面尺寸大,厂内加工制造和现场安装存在诸多技术难题。上坝夹江大桥建设过程中采用以下工艺工法:(1)对超大平面钢塔内端面加工,研发并应用了二次接刀加工的方法,解决了钢塔高加工精... 详细信息

独柱钢塔斜拉桥结构新颖,相较于多塔肢结构,独柱钢塔截面尺寸大,厂内加工制造和现场安装存在诸多技术难题。上坝夹江大桥建设过程中采用以下工艺工法:(1)对超大平面钢塔内端面加工,研发并应用了二次接刀加工的方法,解决了钢塔高加工精度的控制难题。(2.研制了一种钢塔群锚杆定位、调整装置,通过对群锚杆的定位支架和工装进行深化设计研究,实现了3 mm以内的群锚杆定位精度。(3)为保证塔底170 m^(2.超大平面灌浆施工质量,展开多次比例模型试验,对灌浆材料、搅浆设备、供料方式进行比选,论证施工工艺,形成成套超大平面尺寸灌浆技术,能够保证钢-混结合率达到95%以上。独柱钢塔上塔柱刚度小、线型控制难度大,施工中研发了独柱型钢塔安装工艺控制成套技术,主要技术要点为:(1)建立前后场联动的精度管理体系。厂内通过预拼对构件垂直度、长度和接口的金属接触率、壁板错边量等质量指标进行系统检查;现场通过匹配工装、定位基线恢复厂内制造线型。(2.“塔吊垂直工况”下进行钢塔线型测量,通过试验、观测及数据分析的方式排除温度、风力、塔吊附着等对钢塔安装精度的影响。以上技术措施的应用,实现了独柱型钢塔高精度安装,取消原设计上塔柱调节段。

关键词：桥梁工程独柱钢塔模型试验施工技术钢-混结合段

维普期刊数据库

地球关键带与地表通量综合观测研究为黄土高原生态保护和可持续发展提供有力的科技支撑

在线全文

学校读者我要写书评

暂无评论

中国科学院院刊 2020年第3期35卷 378-387页

作者：金钊王云强高光耀强小科蔡秋芳刘禹孙有斌吕一河傅伯杰安芷生中国科学院地球环境研究所西安710016 中国科学院生态环境研究中心北京100085

中国科学院黄土高原地球关键带与地表通量野外观测研究站(以下简称"黄土高原关键带站")立足黄土高原,面向黄河中游,开展季风区地球关键带和地表通量的长期定位观测和数据积累,在科学上为世界地球关键带科学作出突出贡献,在服务国家需求... 详细信息

中国科学院黄土高原地球关键带与地表通量野外观测研究站(以下简称"黄土高原关键带站")立足黄土高原,面向黄河中游,开展季风区地球关键带和地表通量的长期定位观测和数据积累,在科学上为世界地球关键带科学作出突出贡献,在服务国家需求上为黄河流域生态保护和高质量发展等国家战略提供有力的科技支撑。黄土高原关键带站提出了黄土关键带形成演化的"季风控制论",重建了地质历史时期黄土高原植被、温度和降水的变化,查明了黄土关键带形成演化的气候背景;重建了过去500年温度、降水等气候要素序列,揭示了黄土高原干旱、高温等极端气候事件发生的诱因及特点;系统开展了黄土高原生态系统过程与服务研究,揭示了黄土高原关键带土地利用格局与生态过程的作用机理,阐明了不同生态系统服务的形成与相互作用机制,提出了面向可持续发展的黄土高原关键带类型划分的指标体系和方法框架;深入开展了黄土高原多尺度水土过程及其对重大生态工程的响应研究,阐明了黄土高原和黄河流域过去60年径流输沙和水沙关系的时空尺度特征与驱动机制,揭示了土壤水分与区域气候、土壤和植被的相互关系,定量评估了黄土高原生物和工程治理措施的环境效应;为黄土高原综合治理、生态保护和经济社会可持续发展提供决策咨询。

关键词：黄土沉积气候环境演变生态过程水土过程人地关系生态系统服务咨询建议综合观测研究

维普期刊数据库