检索结果-南通市图书馆

Journal of Environmental Sciences 2024年第5期139卷 245-257页

作者： Chaomin Jia Jianbing wang Huijiao wang Sichao Zhu Xiaohui Zhang Yuxiang wang School of Chemical&Environmental Engineering China University of Mining&Technology-BeijingBeijing 100083China Beijing Polytechnic Beijing 100176China Chinese Society for Urban Studies Beijing 100835China

Water fluoride pollution has caused non-negligible harm to the environment and humans,and thus it is crucial to find a suitable treatment *** this study,La-Fe@PTA adsorbent was synthesized for the defluoridation of mine *** results showed that the optimum conditions for defluoridation by La-Fe@PTA were p H close to 7.0,the initial F-concentration of 10 mg/L,the dosage of 0.5 g/L and the adsorption time of 240 *** with SO_4^(2-),Cl^(-),NO_(3)^(-),Ca^(2+)and Mg^(2+),CO_(3)^(2-)and HCO_(3)^(-)presented severer inhibition on fluoride uptake by La-Fe@*** adsorption process fits well with the pseudo-second-order kinetic model and Freundlich model,and the maximum adsorption capacity of Langmuir model was 95 mg/***-bed adsorption results indicated that fluoride in practical fluorinated mine water could be effectively removed from 3.6 mg/L to less than 1.5 mg/L within130 bed volume(BV)by using 1.5 g La-Fe@***,the adsorbent still had good adsorption capacity after regeneration,which confirms the great application potential of La-Fe@PTA as a fluoride ion *** mechanism analysis showed that La-Fe@PTA adsorption of fluorine ions is a physicochemical reaction driven by electrostatic attraction and ion exchange.

关键词： Adsorption La-Fe@PTA Fluoride ion Mine water Mechanism

Hollow Multishelled Structure Reviving Lithium Metal Anode for High-energy-density Batteries

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2024年第3期40卷 428-436页

作者： wang Haoyu WEI Peng wang Jiangyan wang Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeIjing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100190P.R.China

Due to its highest theoretical capacity and its lowest redox potential,lithium(Li)metal has been considered as the ultimate anode choice for high-energy-density rechargeable ***,its commercialization is severely hindered by its poor cyclic stability and safety *** material structure design concepts have been raised to address these failure models,wherein,hollow structure has shown great power in solving the ***,a hollow multishelled structure(HoMs)featured with two or more shells has been proved to be more efficient to improve Li metal anode than their single-shelled ***,this up-to-date review summarizes the recent progress of the application of HoMs in Li metal anode,including their adoption as Li metal host,artificial solid electrolyte interphase film,electrolyte additive,solid state electrolyte,*** offers unique advantages,such as suppressing Li dendrite growth,stabilizing electrode-electrolyte interface,and improving overall battery *** research directions are outlined,emphasizing the need for multifunctional integrated smart HoMS design and large-scale fabrication of HoMS through low-cost accurate method to further advance the commercialization of Li metal batteries.

关键词： Hollow multishelled structure Lithium metal anode Solid electrolyte interphase Coulombic efficiency Cyclic stability

Research on the cuttings discharge in air cushion chamber of slurry shield based on CFD-DEM coupling method Author links open overlay panel

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

Particuology 2024年第8期91卷 88-105页

作者： Han wang Wantao Ding Weimin Yang Chengzhen wang Wenduan Yu Zhicheng wang School of Qilu Transportation Shandong UniversityJinan250002China China Railway 14th Bureau Group Co. LtdJinan250101China

The rapid discharge of cuttings from the air cushion chamber is crucial for the construction safety and excavation efficiency of the slurry *** studies have mainly focused on the transport characteristics of cuttings in the slurry discharge pipe,while the complete process of cuttings entering the slurry discharge pipe from the air cushion chamber until they are discharged was often *** on the CFD-DEM coupling method and combined with actual engineering,this paper established a numerical model that can more completely reflect the cuttings discharge process during slurry shield tunneling,and the effects of the slurry velocity at slurry gate and scouring pipes,inclination angle of slurry discharge pipe,cuttings diameter and shape coefficient were investigated by analyzing the variation in the mass flow rate,mass of discharged cuttings,and discharged *** results revealed that increasing the slurry velocity can promote the discharge of *** keep the discharged rate at a high level,it is recommended that the slurry velocity at the slurry gate should be greater than 0.15 m/*** the inclination angle of the discharge pipe is conducive to the rapid discharge of *** with large diameter or small shape coefficient are more prone to accumulate in the air cushion chamber and cause clogging *** research results not only help to improve engineers'understanding of cuttings discharge in slurry shield,but also provide practical guidance for formulating relevant construction measures.

关键词： Slurry shield CFD-DEM coupling method Cuttings discharge Aircushion chamber Slurry discharge pipe

智能索道配送技术在乡村快递配送中的应用优化研究

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

综合运输 2022年第12期44卷 132-140页

作者：张子璐王宇楠辽宁对外经贸学院辽宁大连116045

为了解决乡村快递配送难题,智能索道配送技术应运而生,作为一种全新的物流配送模式,在目前的试点运行过程中出现了对运输箱利用不充分、信息整合功能较不完善等问题。基于智能索道配送技术雏形,首先结合真空技术、万向细胞传动技术和新... 详细信息

为了解决乡村快递配送难题,智能索道配送技术应运而生,作为一种全新的物流配送模式,在目前的试点运行过程中出现了对运输箱利用不充分、信息整合功能较不完善等问题。基于智能索道配送技术雏形,首先结合真空技术、万向细胞传动技术和新型材料应用对运输箱各组成部分提出结构上、配置上的改进设想,并对物流信息整合平台提出功能优化建议;其次利用3D机械建模构建出理论上新型箱体结构;最后运用层次分析法对比改进前后效果,印证改进设想的有效性。计算分析结果表明,当能源、时间、人力、前期投入和运量运力作为考虑因素时,改进后的智能索道配送是较传送配送而言的更优选择。

关键词：快递进村智能索道配送结构优化层次分析

基于可信性理论的主动配电网运行风险动态评估

在线全文

学校读者我要写书评

暂无评论

电气自动化 2016年第3期38卷 47-49,56页

作者：周毅杨镜非王钰楠上海交通大学电子信息与电气工程学院上海200240

主动配电网中的分布式电源、储能系统、灵活负荷等新技术有着不确定性和间歇性等特点,对主动配电网的安全运行构成了一定的威胁。提出一种基于风险理论的动态方法来评估主动配电网的安全水平。提出了失负荷风险、过电压风险、低电压风... 详细信息

主动配电网中的分布式电源、储能系统、灵活负荷等新技术有着不确定性和间歇性等特点,对主动配电网的安全运行构成了一定的威胁。提出一种基于风险理论的动态方法来评估主动配电网的安全水平。提出了失负荷风险、过电压风险、低电压风险、失风力发电风险几项风险指标多角度的评估主动配电网的安全状态。将方法应用于由IEEE33节点配电网系统修改的主动配电网系统,算例结果反映了不同场景下主动配电网的运行风险状况,证实了提出的各项风险指标的有效性。

关键词：主动配电网运行风险可信性理论失风力发电风险动态评估

在线全文

学校读者我要写书评

暂无评论

典型膨胀土抗剪强度参数试验统计规律研究

灾害学 2019年第A1期34卷 138-141页

作者：汤罗圣王云安邓长青黄裕群颜廷江湖北省交通规划设计院股份有限公司

目前关于膨胀土抗剪强度参数的试验研究较多,主要集中在含水量、黏粒含量、干湿循环、上覆压力等单一因素对膨胀土抗剪强度参数的影响,而从多因素角度对膨胀土抗剪强度参数影响的研究很少。该文将以湖北襄阳地区典型膨胀土室内试验为基... 详细信息

目前关于膨胀土抗剪强度参数的试验研究较多,主要集中在含水量、黏粒含量、干湿循环、上覆压力等单一因素对膨胀土抗剪强度参数的影响,而从多因素角度对膨胀土抗剪强度参数影响的研究很少。该文将以湖北襄阳地区典型膨胀土室内试验为基础,以取样深度、含水量、饱和度、塑限指数和自由膨胀率为影响因子,采用matlab软件建立了上述影响因子与抗剪强度参数的统计关系,并以某膨胀土边坡作为工程实例进行计算分析,分析结果表明其统计规律较适合该地区膨胀土抗剪强度参数的取值。

关键词：膨胀土抗剪强度室内试验统计规律

债券收益率曲线上行中债-新综合价格指数略有下跌——2019年4月债券市场分析报告

在线全文

学校读者我要写书评

暂无评论

债券 2019年第5期 89-93页

作者：尹昱乔王雨楠中央结算公司统计监测部

2019年4月,美国新增非农就业人数为26.3万人,好于前值;失业率降至3.6%,创1970年以来的最低值;消费价格指数(CPI)同比上涨2.0%,不及预期值;制造业采购经理指数(PMI)回落至52.8%,环比降幅较大。通胀压力温和以及PMI的趋势性下降,预示着美... 详细信息

2019年4月,美国新增非农就业人数为26.3万人,好于前值;失业率降至3.6%,创1970年以来的最低值;消费价格指数(CPI)同比上涨2.0%,不及预期值;制造业采购经理指数(PMI)回落至52.8%,环比降幅较大。通胀压力温和以及PMI的趋势性下降,预示着美国经济增长或将大幅放缓,美联储议息会议决定维持联邦基金利率目标区间不变。在欧元区方面,4月调和CPI同比增长1.7%,高于预期值和前值;制造业PMI反弹至47.9%,服务业PMI为52.8%。欧元区经济呈现积极迹象,但仍未走出低迷状态,欧洲央行决定维持利率水平不变。

关键词：市场分析报告综合价格指数收益率曲线债券欧元区经济消费价格指数采购经理指数联邦基金利率

收益率曲线普遍上行现券交易量同比大增——2019年10月债券市场分析报告

在线全文

学校读者我要写书评

暂无评论

债券 2019年第11期 85-89页

作者：尹昱乔王雨楠中央结算公司统计监测部

2019年10月,美国新增非农就业人数远超预期,制造业采购经理指数(PMI)有所回升,美联储如期降息25BP。欧元区核心居民消费价格指数(CPI)超预期,PMI小幅回升,欧洲央行维持政策利率不变。我国CPI同比上涨3.8%,PPI同比下降1.6%,制造业PMI小... 详细信息

2019年10月,美国新增非农就业人数远超预期,制造业采购经理指数(PMI)有所回升,美联储如期降息25BP。欧元区核心居民消费价格指数(CPI)超预期,PMI小幅回升,欧洲央行维持政策利率不变。我国CPI同比上涨3.8%,PPI同比下降1.6%,制造业PMI小幅回落至49.3%,进出口贸易总值同比小幅下降0.5%。我国货币市场利率有所上行,债券收益率曲线普遍上行,中债新综合价格指数略有下跌;债券市场交易量平稳增长,债券发行量保持上升,债券存量小幅增加。

关键词：市场交易量欧洲央行收益率曲线货币市场利率平稳增长欧元区市场分析报告综合价格指数

Ultra-large aluminum shape casting:Opportunities and challenges

在线全文

学校读者我要写书评

暂无评论

China Foundry 2024年第5期21卷 397-408页

作者： Qi-gui wang Andy wang Jason Coryell Advanced Materials Technology&Virtualization GM Global Technical CenterWarrenMI USA

Ultra-large aluminum shape castings have been increasingly used in automotive vehicles,particularly in electric vehicles for light-weighting and vehicle manufacturing cost *** most of them are structural components subject to both quasi-static,dynamic and cyclic loading,the quality and quantifiable performance of the ultra-large aluminum shape castings is critical to their success in both design and *** paper briefly reviews some application examples of ultra-large aluminum castings in automotive industry and outlines their advantages and *** affecting quality,microstructure and mechanical properties of ultra-large aluminum castings are evaluated and discussed as aluminum shape casting processing is very complex and often involves many competing mechanisms,multi-physics phenomena,and potentially large uncertainties that significantly influence the casting quality and *** analysis and mechanical property assessment of an ultra-large aluminum shape casting are *** are highlighted and suggestions are made for robust design and manufacturing of ultra-large aluminum castings.

关键词： ultra-large castings aluminum light-weighting quality microstructure materials properties

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

基于虚拟仪器的数字滤波器的设计

计算机时代 2017年第3期 34-36页

作者：王钰楠关静刘然西安石油大学电子工程学院陕西西安710065

由于数字滤波器在信号处理过程中应用广泛,所以研究滤波器的设计具有重要的实际意义。文章利用Lab Windows/CVI软件设计了滤波处理界面,该界面包括信号的产生、噪声的叠加和滤波器处理;该界面可以选择多种原始信号与噪声信号,并且可以... 详细信息

由于数字滤波器在信号处理过程中应用广泛,所以研究滤波器的设计具有重要的实际意义。文章利用Lab Windows/CVI软件设计了滤波处理界面,该界面包括信号的产生、噪声的叠加和滤波器处理;该界面可以选择多种原始信号与噪声信号,并且可以快速、便捷地修改滤波器的参数。经过实验验证,利用Lab Windows/CVI软件设计数字滤波器,操作简单、功能强大,可以用于实际。

关键词：数字滤波器虚拟仪器滤波噪声