检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

一种智能自动补电系统设计方案

汽车电器 2024年第5期 31-32页

作者：陈海东任强侯黎恒刘新波李洪伟广州汽车集团股份有限公司汽车工程研究院广东广州511434

主要介绍自动补电系统的架构方案和设计原理,并且着重介绍蓄电池传感器EBS、电能管理模块eem、整车控制单元VCU、车载智能通信模块T-BOX之间的交互控制逻辑。该设计方案可有效解决车辆亏电问题,对提升客户驾驶体验具有重要意义。

关键词：自动补电系统 EBS eem VCU T-BOX

An investigation of changes in water quality throughout the drinking water production/distribution chain using toxicological and fluorescence analyses

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

Journal of Environmental Sciences 2020年第1期32卷 310-318页

作者： Xue Han Xin Ji Xuan Ma Jun-Ling Liu Zhen-Yu He Wei Chang Fei Tang Ai-Lin Liu Key Laboratory of Environment and Health Ministry of Education&Ministry of Environmental Protectionand State Key Laboratory of Environmental Health(Incubating)School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Wuhan Center for Disease Control and Prevention Wuhan 430015China School of Public Health Wuhan University of Science and TechnologyWuhan 430030China

Changes in water quality from source water to finished water and tap water at two conventional drinking water treatment plants(DWTPs)were monitored.Beside the routine water quality testing,Caenorhabditis elegans-based toxicity assays and the fluorescence excitation–emission matrices technique were also applied.Both DWTPs supplied drinking water that met government standards.Under current test conditions,both the investigated finished water and tap water samples exhibited stronger lethal,genotoxic and reprotoxic potential than the relative source water sample,and the tap water sample was more lethal but tended to be less genotoxic than the corresponding finished water sample.Meanwhile,the nearly complete removal of tryptophan-like substances and newly generated tyrosine-like substances were observed after the treatment of drinking water,and humic-like substances were identified in the tap water.Based on these findings,toxic pollutants,including genotoxic/reproductive toxicants,are produced in the drinking water treatment and/or distribution processes.Moreover,further studies are needed to clarify the potentially important roles of tyrosine-like and humic-like substances in mediating drinking water toxicity and to identify the potential sources of these contaminants.Additionally,tryptophan-like fluorescence may be adopted as a useful parameter to monitor the treatment performance of DWTPs.Our observations provided insights into the importance of utilizing biotoxicity assays and fluorescence spectroscopy as tools to complement the routine evaluation of drinking water.

关键词： Bioassay C.elegans eem Water treatment Distribution system

Characterization of chromophoric dissolved organic matter(CDOM) in the East China Sea in autumn using excitationemission matrix(eem) fluorescence and parallel factor analysis(PARAFAC)

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2013年第12期56卷 1790-1799页

作者： BAI Ying SU RongGuo YAN LiHong YAO Peng SHI XiaoYong WANG XiuLin Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China

Samples of chromophoric dissolved organic matter(CDOM)in the East China Sea in autumn(October in 2011)were analyzed by excitation emission matrix(eem)fluorescence spectroscopy combined with parallel factor analysis(PARAFAC).Three terrestrial humic-like components(C1,C2 and C3)and one protein-like component(C4)were identified.Based on spatial distributions,as well as relationships with salinity,the following assignments were made.The three humic-like components(C1,C2 and C3)showed conservative mixing behavior and came mainly from riverine input.The protein-like component(C4)was considered a combination of autochthonous production and terrestrial inputs and a biologically labile component.Path analysis of samples from the middle and bottom layers revealed that the causal effects on C1 were 78.46%for salinity,and 21.54%for apparent oxygen utilization(AOU);those on C2 were 76.43%for salinity,and 23.57%for AOU;those on C3 were70.49%for salinity,7.01%for Chl-a,and 22.50%for AOU;those on C4 were 55.54%for salinity,14.6%for Chl-a,and29.86%for AOU in middle layer;and those on C4 were 57.37%for salinity,29.02%for Chl-a,and 13.61%for AOU in bottom layer.Results indicated that CDOM in the East China Sea was mainly affected by terrestrial inputs,and microbial activities also played a key role in biogeochemical processes of CDOM.The application of the eem-PARAFAC model presented a unique opportunity to observe compositional changes in CDOM in the East China Sea.In addition,the humification index(HIX)suggested that CDOM from the East China Sea was less stable and stayed shorter in the environment.

关键词：溶解有机物东中国海因子分析荧光光谱 eem n矩阵平行生物地球化学过程

Interaction of Ca^(2+) and soil humic acid characterized by a joint experimental platform of potentiometric titration, UV–visible spectroscopy, and fluorescence spectroscopy

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2021年第3期40卷 300-311页

作者： Haiming Tang Baohua Xiao Peiwen Xiao State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081GuizhouChina University of Chinese Academy of Sciences Beijing 100049China

Rocky desertification has become a major environmental issue in the karst region of southwestern China.Karst rocky desertification was more severe in regions of limestone soil than in adjacent regions of other soils,despite the relatively higher soil organic matter(SOM)content in limestone soil.The underlying mechanism remains ambiguous.We speculated that the geochemical characteristics of limestone soils in the karst region plays an essential role,especially the high calcium content of limestone soil.To test this hypothesis,we collected limestone soil samples from a limestone soil profile in the southwestern China karst region and extracted humic acid(HA)from these limestone soil samples.We investigated the interaction of Ca^(2+)and three HA samples on a joint experimental platform,which consists of an automatic potentiometric titrator,a UV–visible spectrometer,and a Fluorescence spectrometer.HA solutions were titrated by Ca^(2+)and optical spectra of the HA solutions were monitored during the titration experiments.The results indicated that:(1)the interaction of Ca^(2+)and HA is a combined process of adsorption and complexation.Adsorption dominated the overall distribution behavior of Ca^(2+),which could be fit by Langmuir and Freundlich isotherm models.Complexation was distinguished only when the concentration of Ca2+is low;(2)the changes of UV–visible spectroscopy and excitation–emission matrix fluorescencespectroscopy spectra of HA samples when they were binding with Ca^(2+)implied the apparent molecular size and structure of HA became larger and more complex;(3)the combination of Ca^(2+)and HA plays an important role in the SOM preservation of limestone soils but the stability of the Ca–HA association was relatively weak.The present study draws attention to maintaining the relatively higher Ca^(2+)concentration in limestone soils in ecologic restoration attempts in karst regions.

关键词： Limestone soil Humic acid Calcium Interaction Titration UV–Vis eem

Optimal sensor placement for structural response estimation

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2014年第10期21卷 3993-4001页

作者：陈玮赵文光朱宏平陈骏锋 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

A methodology, termed estimation error minimization(eem) method, was proposed to determine the optimal number and locations of sensors so as to better estimate the vibration response of the entire structure. Utilizing the limited sensor measurements, the entire structure response can be estimated based on the system equivalent reduction-expansion process(SEREP) method. In order to compare the capability of capturing the structural vibration response with other optimal sensor placement(OSP) methods, the effective independence(EI) method, modal kinetic energy(MKE) method and modal assurance criterion(MAC) method, were also investigated. A statistical criterion, root mean square error(RMSE), was employed to assess the magnitude of the estimation error between the real response and the estimated response. For investigating the effectiveness and accuracy of the above OSP methods, a 31-bar truss structure is introduced as a simulation example. The analysis results show that both the maximum and mean of the RMSE value obtained from the eem method are smaller than those from other OSP methods, which indicates that the optimal sensor configuration obtained from the eem method can provide a more accurate estimation of the entire structure response compared with the EI, MKE and MAC methods.

关键词：传感器优化布置估计误差结构响应结构振动响应 MAC方法模态动能均方根误差 eem

Evaluation of In-situ Sludge Reduction and Enhanced Nutrient Removal in an Integrated Repeatedly Coupling Aerobic and Anaerobic and Oxic-setting-anaerobic System

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2015年第5期22卷 17-24页

作者： Shanshan Yang Wanqian Guo Qinglian Wu Haichao Luo Simai Peng Heshan Zheng Xiaochi Feng Nanqi Ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Aiming to achieve simultaneous good performances of in-situ sludge reduction and effluent quality,an integrated repeatedly coupling aerobic and anaerobic and oxic-setting-anaerobic system( r CAA + OSA) is developed to reduce sludge production and enhance nutrient removal. Considering the mechanism of in-situ sludge reduction in this r CAA +OSA system,the combined effect of energy uncoupling metabolism and sludge cryptic growth maybe attributed to the higher reduction of biomass. Results show that the maximal sludge reduction in this r CAA + OSA system is obtained when the hydraulic retention time( HRT) is controlled at6. 5 h,which an increase in 16. 67% reduction in excess sludge is achieved compared with OSA system( HRT of 6. 5 h). When compared the performances of effluent qualities,the enhanced nutrient removal efficiencies also can be observed in this r CAA + OSA system. Three-dimensional excitation emission matrix( 3D-eem)fluorescence spectroscopy is applied to characterize the effluent organic matters( Ef OM) under different HRTs in the OSA and the r CAA+OSA systems. Analyses of 3D-eem spectra show that more refractory humic-like and fulvic-like components are observed in the effluent of the OSA system. On the basis of these results,simultaneous enhanced in-situ sludge reduction and improved nutrient removal can be obtained in the r CAA +OSA systems.

关键词： in-situ sludge reduction BNPR Ef OM eem r CAA OSA

盐积累胁迫下厌氧正渗透MBR混合液性质的响应特性

在线全文

学校读者我要写书评

暂无评论

水处理技术 2022年第4期48卷 50-53页

作者：赵士奇朱雷王舒朱先征黄霞武汉科技大学城市建设学院湖北武汉430065 清华大学环境学院北京100084 环境模拟与污染控制国家重点联合控制实验室北京100084 中规院(北京)规划设计有限公司北京100044

厌氧正渗透膜生物反应器(AnOMBR)是一种将正渗透膜过程与厌氧生物处理结合的新型污水处理技术,近年来备受关注。然而盐积累是其面临的主要挑战。为此,本研究考察AnOMBR在高盐度的冲击下污泥混合液性质的变化情况。结果表明,反应器运行7 ... 详细信息

厌氧正渗透膜生物反应器(AnOMBR)是一种将正渗透膜过程与厌氧生物处理结合的新型污水处理技术,近年来备受关注。然而盐积累是其面临的主要挑战。为此,本研究考察AnOMBR在高盐度的冲击下污泥混合液性质的变化情况。结果表明,反应器运行7 d后,盐积累现象严重,电导率上升到接32 mS/cm,导致初始水通量从14 L/(m^(2)·h)降至3 L/(m^(2)·h)。反应器对TOC和TP的去除效果较好,但氨氮去除效率低于TOC和TP。当反应器内盐浓度胁迫性增长时,混合液中SMP和EPS浓度均有增加,同时eem荧光谱图中SMP和EPS主要响应峰均为色氨酸和色氨酸/酚物质,EPS响应峰受盐度影响明显强于SMP。

关键词：正渗透厌氧膜生物反应器高盐度冲击混合液 eem

A THREE-WAY ARRAY MODEL FOR RESOLVING MULTICOMPONENT FLUORESCENT MIXTURES

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 1992年第1期8卷 6-17页

作者：屠心铭 DONALDS.BURDICK Harvard University School of Public of Health Boston MA 02115 U. S. A. Duke University Durham NC 27706U.S.A.luorescence lifetime provides a third independent dimension of information for the reso-lution of total luminescence spectra of multicomponent mixtures. The incorporation of this pa-rameter into the Excitation-Emission Matrix (EEM) by the phase-modulation technique resultsin a three-dimensional Excitation-Emission-Frequency Array (EEFA). Multicomponent analysisbased on the three-dimensional EEFA brings a qualitative change for the resolved spectra i.e.individual spectra can be uniquely resolved which is impossible with any two-dimensional anal-ysis. In this paper we present a method for analyzing the EEFA. We show mathematicallythat with the three-dimensional analysis of the EEFA individual spectra and lifetimes can be ob-tained. Our algorithm is developed in mathematical detail and demonstrated by its applicationto a two-component mixture.

Fluorescence lifetime provides a third independent dimension of information for the reso-lution of total luminescence spectra of multicomponent mixtures. The incorporation of this pa-rameter into the Excitation-Emission Matrix (eem) by the phase-modulation technique resultsin a three-dimensional Excitation-Emission-Frequency Array (EEFA). Multicomponent analysisbased on the three-dimensional EEFA brings a qualitative change for the resolved spectra, i.e.,individual spectra can be uniquely resolved, which is impossible with any two-dimensional anal-ysis. In this paper, we present a method for analyzing the EEFA. We show mathematicallythat with the three-dimensional analysis of the EEFA individual spectra and lifetimes can be ob-tained. Our algorithm is developed in mathematical detail and demonstrated by its applicationto a two-component mixture.

关键词： A THREE-WAY ARRAY MODEL FOR RESOLVING MULTICOMPONENT FLUORESCENT MIXTURES eem

纳米氧化锌对厌氧污泥中微生物内源代谢产物和膜污染性能的影响

在线全文

学校读者我要写书评

暂无评论

环境工程学报 2018年第6期12卷 1609-1618页

作者：胡勤政王成燚汪跃陈琳河海大学环境学院南京210098 河海大学浅水湖泊综合治理与资源开发教育部重点实验室南京210098

从厌氧污泥的角度,探究ZnO-NPs对微生物内源代谢产物(BAP)产量和膜污染性能的影响。在实验室培养的厌氧污泥中投加不同浓度的ZnO-NP,通过序批式实验和过滤实验,分别考察ZnO-NP作用下BAP的产量和膜污染性能的变化规律。发现在ZnO-NPs的... 详细信息

从厌氧污泥的角度,探究ZnO-NPs对微生物内源代谢产物(BAP)产量和膜污染性能的影响。在实验室培养的厌氧污泥中投加不同浓度的ZnO-NP,通过序批式实验和过滤实验,分别考察ZnO-NP作用下BAP的产量和膜污染性能的变化规律。发现在ZnO-NPs的短期暴露下,BAP和胞外聚合物(EPS)的总量都随着ZnO-NPs浓度的增加而增加。当ZnO-NPs浓度为300 mg·L^(-1)时,BAP和EPS的7 d总产量相较于空白对照组,增幅分别为303.4%和112%,远远高于其他实验组。过滤实验发现,随着ZnO-NPs的增加,BAP的膜污染性能不断增加。此外,通过扫描电镜(SEM)和三维荧光光谱(eem)分别对污泥形态和BAP特性进行研究,发现在ZnO-NPs短期暴露下,ZnO-NPs的浓度越高,其对厌氧污泥的形态和BAP特性影响越大。

关键词： ZnO-NPs BAP EPS SEM eem 膜污染性能