检索结果-南通市图书馆

Living concrete with self-healing function on cracks attributed to inclusion of microorganisms: Theory, technology and engineering applications——A review

引用

Science China(Technological Sciences) 2021年第10期64卷 2067-2083页

作者： QIAN ChunXiang zheng tianwen RUI YaFeng School of Materials Science and Engineering Southeast UniversityNanjing 211189China Research Center of Green Building&Construction Materials Southeast UniversityNanjing 211189China Key Lab of Microbial Bio-mineralization Technology China Construction Materials IndustryNanjing 211189China Jiangsu Key Laboratory for Construction Materials Southeast UniversityNanjing 211189China

Concrete is the most widely used composite material in civil *** induced calcium carbonate precipitation(MICP)is a green and environmental friendly technology,which has received extensive attention in repair of concrete *** paper introduces the research progress in Southeast University research in past 16 *** the early stage,MICP technology of urea hydrolyzed by Bacillus pasteurii was mainly investigated to repair the surface cracks and to fill large-size cracks with ***,aiming at the hidden cracks that were difficult for human intervention,a new mineralization route of Bacillus mucilaginosus was proposed,which could repair faster than Bacillus alcalophilus,and the problem of ammonia emission in the repair process of Bacillus pasteurii was also *** addition,in order to improve the protection of bacteria and the self-healing efficiency of the later age cracks,the methods of fiber immobilization,carrier uniformly immobilization and core-shell structural immobilization had been compared and *** results showed that core-shell structural immobilization had good protection ability and strong ***’s more,the paper also summarized the characteristics of spore germination,cell activity,nucleation and biological calcium carbonate in crack zone,and introduced the application experience of microbial self-healing concrete in water conservancy projects and subway stations.

关键词： living concrete self-healing crack microorganisms engineering application

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

火电耦合压缩空气储能技术研究进展及展望

引用

中国电机工程学报 2024年第18期44卷 7264-7275,I0014页

作者：陈来军梅生伟王斌刘瀚琛邹旺郑天文陈任峰清华大学电机工程与应用电子技术系北京市海淀区100084 青海大学能源与电气工程学院青海省西宁市810016 安徽佑赛科技股份有限公司安徽省芜湖市241000

火电耦合压缩空气储能技术作为一种提升传统火电机组灵活性和经济性的有效手段,近年来受到了广泛关注。该文从分析火电耦合压缩空气储能技术在提升电网调峰能力、促进可再生能源整合等方面的重要意义出发。首先,介绍典型耦合系统的结构... 详细信息

火电耦合压缩空气储能技术作为一种提升传统火电机组灵活性和经济性的有效手段,近年来受到了广泛关注。该文从分析火电耦合压缩空气储能技术在提升电网调峰能力、促进可再生能源整合等方面的重要意义出发。首先,介绍典型耦合系统的结构组成与工作原理;然后,探讨耦合系统中关键设备的技术现状和面临的挑战;之后,梳理火-储耦合系统的集成方案设计、调峰运行优化以及经济性评估的研究现状;最后,针对当前技术难点,展望未来火电耦合压缩空气储能技术的研究方向与重点。该文旨在为今后相关领域研究提供参考与借鉴,推动其持续发展和创新。

关键词：火电机组压缩空气储能多能联供灵活性改造深度调峰

来源：

维普期刊数据库

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

Flexible unbalanced control with peak current limitation for virtual synchronous generator under voltage sags

引用

Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 61-72页

作者： tianwen zheng Laijun CHEN Yan GUO Shengwei MEI State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Qinghai Key Lab of Efficient Utilization of Clean Energy New Energy Photovoltaic Industry Research Center Qinghai University

Virtual synchronous generator(VSG)is gridfriendly for integrating distributed generations(DGs)since it can emulate the operation mechanism of traditional synchronous generator(SG).However,the traditional VSG control strategy,which is mainly suitable for balanced voltage conditions,may lead to power oscillations,current unbalance and even overcurrent under unbalanced voltage *** overcome this difficulty,a flexible unbalanced control with peak current limitation for VSG under unbalanced operating conditions is *** on the basic VSG control algorithm,the control strategy integrates two novel control modules,which are current reference generator(CRG)and power reference generator(PRG).The proposed control strategy can flexibly meet different operation demands,which includes current balancing,constant active or reactive *** the injected currents are kept within safety values for a better utilization of the VSG power ***,the experimental platform is *** results demonstrate the validness and effectiveness of the proposed control strategy.

关键词： Virtual synchronous generator Unbalanced control Current reference generator Power reference generator Voltage sags

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

Microbial production of L-malate from renewable non-food feedstocks

引用

Chinese Journal of Chemical Engineering 2021年第2期34卷 105-111页

作者： Youming Jiang Xiaohan Ye tianwen zheng Weiliang Dong Fengxue Xin Jiangfeng Ma Min Jiang State Key Laboratory of Materials-Oriented Chemical Engineering College of Biotechnology and Pharmaceutical EngineeringNanjing Tech UniversityNanjing 211800China

L-malate is an intermediate of the tricarboxylic acid cycle which is naturally occurred in various microorganisms,and it has been widely applied in polymer,beverage and food,textile,agricultural and pharmaceutical *** by the pursuit of a sustainable economy,microbial production of L-malate has received much attention in last *** this review,we focus on the utilization of wastes and/or byproducts as feedstocks for the microbial production of ***,we present the recent developments on the natural or engineered metabolic pathways that dedicate to the biosynthesis of L-malate,and also provide a comprehensive discussions on developing high-efficient ***,the recent achievements in microbial production of L-malate from various carbon sources were concluded and ***,some abundant non-food feedstocks which have been used for microbial production of other chemicals were reviewed,as they may be potential candidate feedstock for L-malate production in ***,we outlined the major challenges and proposed further improvements for the production of L-malate.

关键词： L-malate Renewable feedstock Microbial fermentation Bioeconomy C4 dicarboxylic acid

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

VSG-based Adaptive Droop Control for Frequency and Active Power Regulation in the MTDC System

引用

CSEE Journal of Power and Energy Systems 2017年第3期3卷 260-268页

作者： Ren Wang Laijun Chen tianwen zheng Shengwei Mei Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

In this paper,a VSG(virtual synchronous generator)-based method with adaptive active power and DC voltage droop is proposed for the control of VSC stations in the multi-terminal DC(MTDC)*** control strategy can improve the inertial level of the AC networks and attenuate the rate of change of frequency when a disturbance *** addition,the droop control of the active power and DC voltage is implemented to make the AC networks share the unbalanced power in the *** droop coefficients are adaptively adjusted depending on the frequency margin of every AC network,which makes the allocation of unbalanced power among AC networks more reasonable from the frequency variation *** control strategy is evaluated in the scenarios of sudden load change and wind turbine tripping,and the results are presented to demonstrate its effectiveness.

关键词： Adaptive droop control frequency regulation MTDC unbalanced power allocation virtual inertial

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

Review and prospect of compressed air energy storage system

引用

Journal of Modern Power Systems and Clean Energy 2016年第4期4卷 529-541页

作者： Laijun CHEN tianwen zheng Shengwei MEI Xiaodai XUE Binhui LIU Qiang LU Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

As an effective approach of implementing power load shifting,fostering the accommodation of renewable energy,such as the wind and solar generation,energy storage technique is playing an important role in the smart grid and energy *** air energy storage(CAES) is a promising energy storage technology due to its cleanness,high efficiency,low cost,and long service *** paper surveys state-of-the-art technologies of CAES,and makes endeavors to demonstrate the fundamental principles,classifications and operation modes of *** subsystems of CAES are elaborated *** application prospects and further research directions are summarized to promote the popularization of CAES in smart grid and energy internet.

关键词： Energy storage Compressed air energy storage(CAES) Smart grid Energy internet

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

Low Carbon Economic Dispatch for Multi-energy Distribution Network with Compressed Air Energy Storage System as Energy Hub

Low Carbon Economic Dispatch for Multi-energy Distribution N...

引用

第36届中国控制会议

作者： Binhui Liu Qiyou Lin tianwen zheng Laijun Chen Shengwei Mei Department of Electrical Engineering Tsinghua University State Grid Wuhu Electric Power Company

ISBN: (纸本)9781538629185

Nowadays,energy crisis and environmental pollution have made utilize multiple energy in an integrated way a trend of future energy system *** multi-energy distribution network connected via energy hubs is one of the promising *** this paper,an energy hub model of compressed air energy storage system is established for the integration in the multi-energy distribution *** at reducing the whole operation and carbon cost,a low carbon economic dispatch model for multi-energy distribution network is constructed and verified on a coupled system with a 13-bus power distribution network and a 13-node district heating network,which successfully demonstrated the effectiveness of the proposed model in terms of reducing the total *** model can be generally extended to more complicated multi-energy networks.

关键词： Multi-energy distribution network low carbon economic dispatch compressed air energy storage system energy hub power distribution network district heating network

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

Active Damping of Multi-paralleled Inverters with LCL Filters Based on Virtual Harmonic Resistance Control Strategy

Active Damping of Multi-paralleled Inverters with LCL Filter...

引用

第36届中国控制会议

作者： Laijun Chen Lifeng Li tianwen zheng Chunlai Li Yan Guo Shengwei Mei Qinghai Key Lab of Efficient Utilization of Clean Energy(New Energy Photovoltaic Industry Research Center Qinghai University) State Key Lab of Power System Department of Electrical EngineeringTsinghua University Key Laboratory of Photovoltaic Power Generation and Grid-connected Technology Qinghai Electrical Power Research Institute Qinghai Electric Power Corporation

ISBN: (纸本)9781538629185

With the development and utilization of renewable energy,power electronic inverters are becoming more and more widely employed as the interfaces of renewable energy sources in modern power ***,because of the LCL filter,parallel-inverter-based grid-interactive system may experience serious resonance problems at different *** paper first develops a mathematical model of parallel-inverter-based grid-interactive *** resonance characteristic can then be investigated with the introduced *** improve the power quality,a virtual-harmonic-resistance-based active damping method is *** the traditional method,a virtual resistance is in parallel with the grid-side inductor of LCL filter in the proposed *** with a harmonic detector,the influence on fundamental wave control is greatly ***,the costs of the control system can be decreased because there is no need to involve any additional ***,simulation results on the platform of Matlab/Simulink are provided to validate the correctness of the developed resonance modeling and active damping method.

关键词： Inverters LCL filter Resonance Virtual Resistance Grid-interactive

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

Hierarchical Energy Management for Economic Operation of Micro Energy Internet Systems

Hierarchical Energy Management for Economic Operation of Mic...

引用

第36届中国控制会议

作者： Wei Liu tianwen zheng Zhenquan Sun Laijun Chen Lifeng Li Shengwei Mei Shaanxi Regional Electric Power Group Co.Ltd. State Key Lab of Power System Department of Electrical EngineeringTsinghua University Qinghai Key Lab of Efficient Utilization of Clean Energy(New Energy Photovoltaic Industry Research Center Qinghai University)

ISBN: (纸本)9781538629185

In this paper,the concept of micro energy internet is discussed *** achieve economic and environmental goal in the operation of micro energy internet,a hierarchical energy management system is proposed to handle the power flow exchanged between the micro energy internet and the host ***,the concept,characteristics and operational goals of micro energy internet is ***,a three-layer hierarchical optimization model concerning energy efficiency and environmental issue is proposed based on the game theory.A micro energy internet consists of an electricity network and thermal network is investigated and the effectiveness of the proposed management system is validated.

关键词： Hierarchical energy management Micro energy internet Multi objective functions

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

泉州地区支气管哮喘儿童过敏情况分析

引用

福建医药杂志 2024年第2期46卷 22-26页

作者：陈琼华郑敬阳林春燕徐毅泷方碧清涂槟斌郑天文福建医科大学第三临床医学院泉州市妇幼保健院􀅰儿童医院呼吸科泉州362000 泉州市妇幼保健院􀅰儿童医院耳鼻喉科泉州362000 泉州市妇幼保健院􀅰儿童医院皮肤科泉州362000 泉州市妇幼保健院􀅰儿童医院医务科泉州362000

目的调查泉州地区支气管哮喘患儿的过敏情况。方法分析2012年1月至2023年6月我院收治的320例支气管哮喘患儿过敏原以及其他系统过敏情况。结果320例患儿过敏原检测阳性率为89.38%,吸入性过敏原主要为尘螨、屋尘、蟑螂,分别占74.38%、20.... 详细信息

目的调查泉州地区支气管哮喘患儿的过敏情况。方法分析2012年1月至2023年6月我院收治的320例支气管哮喘患儿过敏原以及其他系统过敏情况。结果320例患儿过敏原检测阳性率为89.38%,吸入性过敏原主要为尘螨、屋尘、蟑螂,分别占74.38%、20.94%、14.69%;食物性过敏原主要为鸡蛋白、牛奶、蟹,分别占19.69%、19.02%、12.81%。不同年龄组户尘螨、屋尘、狗毛鸡蛋白阳性分布存在差异,婴幼儿组尘螨阳性率低于学龄前组和学龄组(χ^(2)=29.24、33.87,P<0.05);婴幼儿组屋尘阳性率低于学龄组(χ^(2)=4.59,P=0.030);与学龄组相比,学龄前组狗毛、鸡蛋白阳性率更高(χ^(2)=10.07,10.54,P<0.05)。共病221例(69.06%),3个以上系统过敏75例(23.44%)。需要耳鼻喉科诊疗165例,其中鼻炎162例,需要皮肤科诊疗118例,营养科11例,眼科6例,消化科4例,药剂科4例。结论泉州地区支气管哮喘儿童最主要的过敏原为尘螨,不同年龄患儿户尘螨、屋尘、狗毛、鸡蛋白阳性分布存在差异,支气管哮喘容易合并多系统过敏表现,评估和管理需注意多学科联合。

关键词：泉州地区哮喘儿童过敏原多学科

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

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：