检索结果-南通市图书馆

Evolution of soil DOM during thermal remediation below 100℃:concentration,spectral characteristics and complexation ability

引用

Frontiers of Environmental Science & Engineering 2024年第8期18卷 31-41页

作者： Wan Huang Ziren Wan Di Zheng lifeng cao Guanghe Li Fang Zhang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China National Engineering Laboratory for Site Remediation Technologies Beijing 100015China

The impact of thermal remediation on soil function has drawn increasing *** far,as the most active fraction of soil organic matter,the evolution of dissolved organic matter(DOM)during the thermal remediation lacks in-depth investigation,especially for the temperatures value below 100℃.In this study,a series of soil thermal treatment experiments was conducted at 30,60,and 90℃ during a 90-d period,where soil DOM concentration increased with heating temperature and *** molecular weight,functional groups content and aromaticity of DOM all decreased during the thermal *** excitation-emission matrices(EEM)results suggested that humic acid-like substances transformed into fulvic acid-like substances(FIII/FV increased from 0.27 to 0.44)during the heating process,and five DOM components were further identified by *** change of DOM structures and components indicated the decline of DOM stability and hydrophilicity,and can potentially change the bioavailability and *** temperature also resulted in the decline of DOM complexation ability,which may be caused by the loss of binding sites due to the decrease of polar function groups,aromatic structures and hydrophilic *** study provides valuable information about the evolution of DOM during thermal remediation,which would potentially change the fate of metal ions and the effectiveness of the post-treatment technologies in the treated region.

关键词： Thermal remediation below 100℃ Heating temperature Soil DOM concentration DOM spectral characteristics Excitation-emission matrices(EEM) Complexation ability

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

基于磁吸附的风管密封盖板优化设计

引用

机电工程技术 2024年第5期53卷 269-273页

作者：曹立峰深圳市朗奥洁净科技股份有限公司广东深圳518000

针对传统风管密封方式存在拆装不够便捷、密封质量不可靠、不能重复利用、用完后丢弃容易引起环境污染的问题,基于磁吸附理论,设计了两种具有磁吸式的风管密封盖板,方案一中磁铁块的长宽高为20mm×10mm×2mm,方案二则为40mm×20mm×5 m... 详细信息

针对传统风管密封方式存在拆装不够便捷、密封质量不可靠、不能重复利用、用完后丢弃容易引起环境污染的问题,基于磁吸附理论,设计了两种具有磁吸式的风管密封盖板,方案一中磁铁块的长宽高为20mm×10mm×2mm,方案二则为40mm×20mm×5 mm。为验证磁吸式风管密封盖板设计方法的可行性,在SolidWorks中对风管和密封盖板进行三维建模和虚拟装配。根据风管密封盖板的三维设计方案,利用激光切割机、数控冲床、数控折弯机、焊机等设备,进行风管和密封盖板各零部件的机加工制造,最后进行风管和密封盖板的组装密封测试。结果表明:两种密封盖板虽然都能起到密封效果,但方案二中的密封盖板磁性更强,在与风管进行贴合时的吸附粘合力更大,所以密封效果更好;优化后的风管密封盖板采用磁铁吸附密封方式,其具备拆装方便、密封性强、可重复使用的特点,有效解决了传统风管密封方式存在的弊端,为传统风管密封方式的改进和优化提供了参考依据。

关键词：风管密封盖板磁铁吸附虚拟装配

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

Influence of CaF_2 on the structure and dielectric properties of Ag(Nb_(0.8)Ta_(0.2))O_3 ceramics

引用

Rare Metals 2010年第1期29卷 50-54页

作者： cao lifeng LI Lingxia ZHANG Ping WU Haitao School of Electronic and Information Engineering Tianjin University Tianjin 300072 China School of Materials Science and Engineering University ofJinan Jinan 250022 China

Ag（Nb0.8Ta0.2）O3 ceramics were prepared by the traditional solid-state reaction method. The effect of CaF2 addition on the structure and dielectric properties of Ag（Nb0.8Ta0.2）O3 ceramics was investigated. The addition of CaF2 led the ceramics to a larger grain size and distortion of lattice. With the addition of 4.5 wt.% CaF2, the permittivity of the ceramics increased from 442 to 1028, the dielectric loss decreased sharply from 6.12 × 10^-3 to 8.6 × 10^-4, and the temperature coefficient of capacitance decreased from 1834 ppm/℃ to -50 ppm/℃ （at 1 MHz）. These results indicated that the high permittivity was related with a large grain size, a low grain boundary density, and the weak Ta-O or Nb-O bond strength caused by the addition of CaF2.

关键词： microwave materials Ag(Nb,Ta)O3 solid-state reaction method dielectric properties

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

超音速火焰喷涂Ni60/WC-10Co4Cr复合涂层的组织与性能

引用

机械工程材料 2024年第5期48卷 84-89页

作者：劳新力张家健高传连曹利锋王群中海石油(中国)有限公司湛江分公司湛江524000 航发燃机(株洲)有限公司株洲412008 湖南大学材料科学与工程学院长沙410082

以Ni60合金粉末与WC-10Co4Cr粉末为原料,采用以空气为助燃气体的超音速火焰喷涂工艺制备Ni60/WC-10Co4Cr复合涂层,研究了添加不同质量分数(20%,40%,60%)WC-10Co4Cr涂层的显微组织、耐磨粒磨损性能和耐腐蚀性能,并与电镀硬铬层进行对比... 详细信息

以Ni60合金粉末与WC-10Co4Cr粉末为原料,采用以空气为助燃气体的超音速火焰喷涂工艺制备Ni60/WC-10Co4Cr复合涂层,研究了添加不同质量分数(20%,40%,60%)WC-10Co4Cr涂层的显微组织、耐磨粒磨损性能和耐腐蚀性能,并与电镀硬铬层进行对比。结果表明:Ni60/WC-10Co4Cr复合涂层由镍基固溶体(NiCr)、铬的碳化物(Cr_(23)C_(6)和Cr_(7)C_(3))和硼化物(Cr_(2)B)以及WC组成,涂层与基体结合紧密,孔隙率均低于1%;随着WC-10Co4Cr含量的增加,复合涂层中的硬质WC相含量增加,涂层的硬度升高,磨粒磨损体积损失明显下降,耐磨粒磨损性能提高,自腐蚀电位降低,自腐蚀电流密度增大,耐腐蚀性能下降。添加质量分数60%WC-10Co4Cr的复合涂层的性能最佳,其耐磨性能与电镀硬铬层相当,耐腐蚀性能优于电镀硬铬层,硬度略低于电镀硬铬层;采用该涂层来代替电镀硬铬是可行的。

关键词：超音速火焰喷涂金属陶瓷涂层磨粒磨损耐腐蚀性能

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

Cross-Domain Data Traceability Mechanism Based on Blockchain

引用

Computers, Materials & Continua 2023年第8期76卷 2531-2549页

作者： Shoucai Zhao lifeng cao Jinhui Li Jiling Wan Jinlong Bai He’nan Province Key Laboratory of Information Security Zhengzhou450000China

With the application and development of blockchain technology,many problems faced by blockchain traceability are gradually *** as cross-chain information collaboration,data separation and storage,multisystem,multi-security domain collaboration,*** solve these problems,it is proposed to construct trust domains based on federated *** public chain is used as the authorization chain to build a cross-domain data traceability mechanism applicable to multi-domain ***,the architecture of the blockchain cross-domain model is *** with the data access strategy and the decision mechanism,the open and transparent judgment of cross-domain permission and cross-domain identity authentication is *** the public chain consensus node election mechanism is realized based on ***,according to the characteristics of a nonsingle chain structure in the process of data flow,a data retrievalmechanism based on a Bloom filter is designed,and the cross-domain traceability algorithm is ***,the safety and effectiveness of the traceability mechanism are verified by security evaluation and performance analysis.

关键词： Cross-domain data traceability blockchain bloom filter

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

Competition for electrons between reductive dechlorination and denitrification

引用

Frontiers of Environmental Science & Engineering 2017年第6期11卷 129-138页

作者： lifeng cao Weihua Sun Yuting Zhang Shimin Feng Jinyun Dong Yongming Zhang Bruce E. Rittmann Department of Environmental Science and Engineering College of Life and Environmental Science Shanghai Normal University Shanghai 200234 China Biodesign Swette Center for Environmental Biotechnology Arizona State University Tempe AZ 85287-5701 USA

It is common that 2,4,6-trichlorophenol （TCP） coexists with nitrate or nitrite in industrial wastewaters. In this work, simultaneous reductive dechlorination of TCP and denitrification of nitrate or nitrite competed for electron donor, which led to their mutual inhibition. All inhibitions could be relieved to a certain degree by augmenting an organic electron donor, but the impact of the added electron donor was strongest for TCP. For simultaneous reduction ofTCP together with nitrate, TCP＇s removal rate value increased 75% and 150%, respectively, when added glucose was increased from 0.4 mmol· L^-1 to 0.5 mmol· L^-1 and to 0.76 mmol· L^-1 For comparison, the removal rate for nitrate increased by only 25% and 114% for the same added glucose. The relationship between their initial biodegradation rates versus their initial concentrations could be represented well with the Monod model, which quantified their half-maximum-rate concentration （Ks value）, and Ks values for TCP, nitrate, and nitrite were larger with simultaneous reduction than independent reduction. The increases in Ks are further evidence that competition for the electron donor led to mutual inhibition. For bioremediation of wastewater containing TCP and oxidized nitrogen, both reduction reactions should proceed more rapidly if the oxidized nitrogen is nitrite instead of nitrate and if readily biodegradable electron acceptor is augmented.

关键词： Competition for electrons Denitrification Reductive dechlorination Bioremediation Nitrate 2 4 6-trichlorophenol

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

Structural design and characterization of a new chalcone molecular derivative crystal DMNC with high second-order nonlinear coefficient

引用

Chinese Journal of Structural Chemistry 2023年第3期42卷 7-10页

作者： Jinkang Ma Siyuan Hu Xueting Mu Rui Chen Kun Meng Bing Teng lifeng cao Degao Zhong College of Physics Qingdao UniversityQingdao266071China National Demonstration Center for Experiment Applied Physics Education(Qingdao University) Qingdao266071China College of Physics University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao266071China Weihai Innovation Research Institute of Qingdao University Weihai264200China Quenda Terahertz Technologies Ltd.600 Jiushui E Rd.Qingdao266102China

*** In recent years,new organic second-order nonlinear optical materials have been widely used in optical imaging,data storage,information processing and communication,etc.[1].Therefore,designing and growing crystalli... 详细信息

关键词： nonlinear derivative crystal

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

“10S”管理法在中药房工作管理的应用效果评价

引用

中国药师 2024年第5期27卷 855-863页

作者：钟运香袁娇曹丽凤梁勇周彩珍赖柳嫦东莞市滨海湾中心医院药剂科广东虎门523000

目的本研究旨在验证“10S”管理法在提高中药房工作效率方面的效果。方法采用对照试验法,以“10S”管理实施前(2022年1至7月)作为对照组,“10S”管理实施后(2023年1至7月)作为试验组,比较中药房日常用品开支、场所环境、药师药学服务... 详细信息

目的本研究旨在验证“10S”管理法在提高中药房工作效率方面的效果。方法采用对照试验法,以“10S”管理实施前(2022年1至7月)作为对照组,“10S”管理实施后(2023年1至7月)作为试验组,比较中药房日常用品开支、场所环境、药师药学服务胜任力、调剂工作质量与效率、调剂差错率、患者满意度等内容。结果在实施“10S”管理后,中药房日常开支减少,场所更整洁有序,药师药学服务胜任力明显提高,调剂工作的质量和效率显著改善,调剂差错率降低,患者的满意度进一步提升。数据显示,中药房工作繁忙阶段调剂时间由(7.77±0.21)min缩减至(6.64±0.27)min,工作繁忙阶段平均发药时间由(32.44±1.32)min缩减至(17.05±2.23)min。结论 “10S”管理法建议在中药房推广应用,以提高中药师工作效率和服务质量。

关键词： “10S”管理中药房调剂日常用品开支场所环境药学服务胜任力药品调剂质量药品调剂差错率药品调剂效率患者满意度

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

Synthesis, crystal structure and thermal analysis of a new stilbazolium salt crystal

引用

Frontiers of Materials Science 2015年第2期9卷 147-150页

作者： Bing TENG Weijin KONG Ke FENG Fei YOU lifeng cao Degao ZHONG Lun HAO Qing SUN Sander van SMAALEN Wenhui GONG College of Physics Qingdao University Qingdao 266071 China Key Laboratory of Photonics Materials and Technology in Universi~iesof Shand'ongl Qingdao 266071 China Laboratory of Crystallography Universityof Bayreuth D-95440 BayreuihGermany

A new organic crystal of 4-N, N-dimethylamino-4＇-N＇-methyl-stilbazolium benzene sulfonate （DASBS） was synthesized and characterized for the first time. It is a derivative of 4-N, N-dimethylamino-4＇-N＇-methyl-stilbazolium tosylate （DAST） with the benzene sulfonate replacing p-toluenesulfonate. Single crystal XRD demonstrated that the crystal structure of DASBS. H20 was triclinic. The thermal analysis of this new crystal was also conducted, and the melting point was obtained to be 232℃.

关键词： organic crystal crystal growth single crystal X-ray diffraction thermalanalysis

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

温度对厌氧耗氢产甲烷的影响研究进展

引用

化工进展 2021年第S1期40卷 326-333页

作者：陈露蕊曹利锋同济大学环境科学与工程学院长江水环境教育部重点实验室上海200092 清华大学环境学院北京100084

化石燃料燃烧过程中大量排放的CO_(2)引起了人们对CO_(2)生物甲烷化的关注。厌氧有机物生物降解过程中,与CO_(2)生物甲烷化相关的主要是厌氧耗氢产甲烷菌。近年来,研究者们关注温度对厌氧耗氢产甲烷过程的影响,对推动厌氧耗氢产甲烷工... 详细信息

化石燃料燃烧过程中大量排放的CO_(2)引起了人们对CO_(2)生物甲烷化的关注。厌氧有机物生物降解过程中,与CO_(2)生物甲烷化相关的主要是厌氧耗氢产甲烷菌。近年来,研究者们关注温度对厌氧耗氢产甲烷过程的影响,对推动厌氧耗氢产甲烷工艺的发展有着重要的意义。本文从厌氧耗氢产甲烷技术原理出发,介绍了厌氧生物降解过程中耗氢产甲烷菌的重要作用,归纳了32种仅利用H_(2)和CO_(2)产CH_(4)的专性耗氢产甲烷菌,展示了氢气可以来源于化石燃料、生物质、水的分解和工业气体,综述了不同温度范围下厌氧耗氢产甲烷的效能,总结了不同温度变化方式对厌氧耗氢产甲烷的影响,并从氢气来源和温度变化等方面提出了展望。

关键词：厌氧生物降解耗氢产甲烷氢气来源温度变化氢气利用率

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：