检索结果-南通市图书馆

Chemical oxygen demand oxidation via sustained-release persulfate balls: a rate-compatibility study of flow velocity, releasing, and oxidation

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第9期25卷 749-762页

作者： Bate BATE Danting zhang Jianshe YE min XIA Yixin YANG Shuai zhang Institute of Geotechnical Engineering Zhejiang UniversityHangzhou 310058China Shanghai Envirunion Eco-technology Co. Ltd.Shanghai 201106China China Railway Eryuan Engineering Group East China Survey and Design Co. LtdHangzhou 310043China The Architectural Design&Research Institute of Zhejiang University Co Ltd.Hangzhou 310027China

Identification of chemical oxygen demand(COD)in municipal solid waste(MSW)landfill leachates is a challenging *** paper investigated the feasibility of using sodium persulfate(PS),a strong oxidant,as a permeable reactive barrier(PRB)filling ***,sustained-release persulfate balls were manufactured to adjust the release rate of persulfate,the oxidation *** addition,Fe(II)-loaded activated carbon(Fe-AC)was used to help with an even distribution of Fe(II)in the porous medium(PRB in this case).Then,the oxidation efficiency and kinetic rate of COD removal by the sustained-release balls were subjected to batch tests.A mass ratio of 1:1.4:0.24:0.7 for PS:cement:sand:water was the most efficient for COD removal(95%).The breakthrough curve for a 5 mm sustained-release ball revealed that the retardation factor was 1.27 and that the hydrodynamic dispersion coefficient was 15.6 cm^(2)/*** corresponding half-life of COD oxidation was 0.43 d,which was comparable with the half-life of PS release from sustained-release balls(0.56 d).The sustained-release persulfate balls were shown to be an economical material with a simple recipe and production method when catalyzed by *** with cutting-edge methods,sustained-release balls used in PRBs offer significant advantages in terms of both effectiveness and economy for the preparation of sustained-release and catalytic *** results verified the feasibility of using sustained-release persulfate balls as a PRB material for COD removal.

关键词： Chemical oxygen demand(COD) Sodium persulfate(PS) Sustained-release balls Permeable reactive barrier(PRB) Fe(II)-loaded activated carbon(Fe-AC)

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

Enhanced thermal conductivity and mechanical properties of 2D C_(f)/SiC composites modified by in-situ grown carbon nanotubes

引用

Journal of Advanced Ceramics 2024年第1期13卷 19-33页

作者： Changhui Niu Qing zhang Laifei Cheng Fang Ye Litong zhang min Huang Tao Yang Science and Technology on Thermostructure Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China Civil Aviation Department Zhejiang Institute of CommunicationsHangzhou 311112China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000China

In this work,the effects of carbon nanotubes(CNTs)on the microstructure evolution,thermal conductivity,and mechanical properties of C_(f)/SiC composites during chemical vapor infiltration(CVI)densification were investigated in *** with composites without CNTs,the thermal conductivity,flexural strength,flexural modulus,fracture toughness,interfacial shear strength,and proportional limit stress of specimens with CNTs of 4.94 wt%were improved by 117%,21.8%,67.4%,10.3%,36.4%,and 71.1%,*** improvement was attributed to the role of CNTs in the division of inter-layer pores,which provided abundant vapor growth sites for the ceramic matrix and promoted densification of the whole *** addition,the high thermal conductivity network formed by the overlap of CNTs and the rivet strengthening effect of CNTs were beneficial for synergistic improvement of thermal conductivity and mechanical properties of the ***,this study has practical significance for the development of thermal protection composite components with enhanced thermal conductivity and mechanical characteristics.

关键词： ceramic−matrix composites carbon nanotubes microstructure thermal conductivity mechanical properties

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

中国先进研究堆燃料板性能试验研究和行为评述

引用

原子能科学技术 2005年第B7期39卷 99-103页

作者：康亚伦张爱民张应超中国原子能科学研究院反应堆工程研究设计所北京102413

文章介绍中国先进研究堆燃料板及其性能试验结果,并对燃料行为进行了评述。通过对铀密度为4.3g/cm3的U3Si2Al弥散体燃料和包壳材料的热物性测量、包壳的腐蚀试验、燃料板的机械性能测量、热循环和辐照性能试验,可以确认,燃料板在最高温... 详细信息

文章介绍中国先进研究堆燃料板及其性能试验结果,并对燃料行为进行了评述。通过对铀密度为4.3g/cm3的U3Si2Al弥散体燃料和包壳材料的热物性测量、包壳的腐蚀试验、燃料板的机械性能测量、热循环和辐照性能试验,可以确认,燃料板在最高温度不超过起泡温度(550℃)情况下一般不会破损,裂变产物不会从燃料板泄漏。燃料芯体能够经受温度高达400℃的多次热循环,芯体不开裂,不碎化,芯体与包壳之间的结合、U3Si2颗粒与基体铝结合良好。温度直到250℃,燃料板不会产生变形。在热流密度直到4.0MW/m2、芯体最高温度为230℃、样品辐照燃耗达71.8%(原子百分数)条件下,燃料板无变形和损伤,燃料板肿胀不明显。

关键词：中国先进研究堆 U3Si2-Al燃料板性能试验行为评述

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

Realize ultralow-energy-consumption photo-synaptic device based on a single(Al,Ga)N nanowire for neuromorphic computing

引用

Nano Research 2024年第3期17卷 1933-1941页

作者： Xiushuo Gu min Zhou Yukun Zhao Qianyi zhang Jianya zhang Yonglin Huang Shulong Lu College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Lab of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

The rapid development of artificial intelligence poses an urgent need for low-energy-consumption and small-sized artificial photonic ***,it is pretty novel to demonstrate a light-stimulated synaptic device based on a single(Al,Ga)N nanowire *** to the presence of vacancy defects in the single nanowire,the artificial synaptic device can simulate multiple functions of biological synapses under stimulation of both 310 and 365 nm light photons,including paired-pulse facilitation,spike timing dependent plasticity,and memory learning *** energy consumption of artificial synaptic device can be reduced as little as 5.58×10^(-13) J,which is close to that of the biological synapse in human ***,the synaptic device is demonstrated to have the high stability for both long-time stimulation and long-time *** on the experimental conductance of long-term potentiation and long-term depression,the simulated three-layer neural network can achieve a high recognition rate of 92%after only 10 training *** a brain-like behavior,the single-nanowire-based synaptic devices can promote the development of visual neuromorphic computing technology and artificial intelligence systems requiring ultralow energy consumption.

关键词： single(Al Ga)N nanowire light-stimulated synaptic device low-energy-consumption neural network

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

A New High-Precision and Lightweight Detection Model for Illegal Construction Objects Based on Deep Learning

引用

Tsinghua Science and Technology 2024年第4期29卷 1002-1022页

作者： Wenjin Liu Lijuan Zhou Shudong zhang Ning Luo min Xu School of Cyberspace Security(School of Cryptology) Hainan UniversityHaikou 570228China School of Information Engineering Capital Normal UniversityBeijing 100048China

Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are large. To solve these challenges, a new and unique detection method is proposed, which detects objects related to illegal buildings in time to discover illegal construction activities. Meanwhile, a new dataset and a high-precision and lightweight detector are proposed. The proposed detector is based on the algorithm You Only Look Once (YOLOv4). The use of DenseNet as the backbone of YDHNet enables better feature transfer and reuse, improves detection accuracy, and reduces computational costs. Meanwhile, depthwise separable convolution is employed to lightweight the neck and head to further reduce computational costs. Furthermore, H-swish is utilized to enhance non-linear feature extraction and improve detection accuracy. Experimental results illustrate that YDHNet realizes a mean average precision of 89.60% on the proposed dataset, which is 3.78% higher than YOLOv4. The computational cost and parameter count of YDHNet are 26.22 GFLOPs and 16.18 MB, respectively. Compared to YOLOv4 and other detectors, YDHNet not only has lower computational costs and higher detection accuracy, but also timely identifies illegal construction objects and automatically detects illegal construction activities.

关键词： object detection lightweight illegal buildings illegal construction objects high-precision

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

木模提升法施工双幅空心拱形盖梁墩

引用

桥梁建设 2009年第1期39卷 7-10页

作者：张爱民中铁大桥局集团第四工程有限公司江苏南京210031

总结京沪高速铁路南京大胜关长江大桥水中主桥4号墩身的木模施工工艺及施工过程中存在的若干问题,尤其是对散拼WISA面板、轻型支撑结构、精轧螺纹拉杆合理应用、墩身爬锥精确预埋等进行技术分析,归纳施工操作细节,并对此种模板在类似墩... 详细信息

总结京沪高速铁路南京大胜关长江大桥水中主桥4号墩身的木模施工工艺及施工过程中存在的若干问题,尤其是对散拼WISA面板、轻型支撑结构、精轧螺纹拉杆合理应用、墩身爬锥精确预埋等进行技术分析,归纳施工操作细节,并对此种模板在类似墩身施工中的相适性、推广发展等方面进行了一些探讨。

关键词：桥墩空心墩拱形盖梁模板

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

Inkjet-Printing Controlled Phase Evolution Boosts the Efficiency of Hole Transport Material Free and Carbon-Based CsPbBr_(3) Perovskite Solar Cells Exceeding 9%

引用

Energy & Environmental Materials 2024年第2期7卷 209-220页

作者： Lihua zhang Shi Chen Jie Zeng Zhengyan Jiang Qian ai Xianfu zhang Bihua Hu Xingzhu Wang Shihe Yang Baomin Xu Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry The Hong Kong University of Science and TechnologyClear Water BayHong KongChina Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifeng 475004China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

Hole transport material free carbon-based all-inorganic CsPbBr_(3)perovskite solar cells(PSCs)are promising for commercialization due to its low-cost,high open-circuit voltage(V_(oc))and superior *** to the different solubility of PbBr_(2)and CsBr in conventional solvents,CsPbBr_(3)films are mainly obtained by multi-step spin-coating through the phase evolution from PbBr_(2)to CsPb_(2)Br_(5)and then to CsPbBr_(3).The scalable fabrication of high-quality CsPbBr_(3)films has been rarely ***,an inkjet-printing method is developed to prepare high-quality CsPbBr_(3)*** formation of long-range crystalline CsPb_(2)Br_(5)phase can effectively improve phase purity and promote regular crystal stacking of CsPbBr_(3).Consequently,the inkjet-printed CsPbBr_(3)C-PSCs realized PCEs up to 9.09%,8.59%and 7.81%with active areas of 0.09,0.25,and 1 cm^(2),respectively,demonstrating the upscaling potential of our fabrication method and *** high performance is mainly ascribed to the high purity,strong crystal orientation,reduced surface roughness and lower trap states density of the as-printed CsPbBr_(3)*** work provides insights into the relationship between the phase evolution mechanisms and crystal growth dynamics of cesium lead bromide halide films.

关键词： all-inorganic perovskite solar cells CsPbBr_(3) inkjet-printing phase evolution

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

对《企业、法规、宏观资产负债表指标在危机预测和预防中的作用》一文的解读与评述

引用

金融理论与实践 2008年第9期 49-51页

作者：张爱民武汉大学经济与管理学院湖北武汉430072

本文主要是对《企业、法规、宏观资产负债表指标在危机预测和防范中的作用》一文的解读和评述。国际货币基金组织政策发展评论部门的Mulder、Perrelli和Rocha在2002年3月发表的一篇以亚洲金融危机为现实背景,运用一系列独特的评价指标... 详细信息

本文主要是对《企业、法规、宏观资产负债表指标在危机预测和防范中的作用》一文的解读和评述。国际货币基金组织政策发展评论部门的Mulder、Perrelli和Rocha在2002年3月发表的一篇以亚洲金融危机为现实背景,运用一系列独特的评价指标对外部危机进行有效地评价,提出了企业部门的资产负债表对外部危机发生的可能性和深度均有着非常明确的指示作用,而且还建议政策的制定者需要努力去构建一个健全的企业部门的金融结构,并从法律法规层面对股东权利的健全进行支持,以此可以在危机过程中减少冲击和危机的联动性。这些论述,对我们在研究国内危机预测和防范方面有一定的借鉴意义,但需要进一步补充和完善,宏观经济资产负债表分析方法也有待继续深化和扩展,加入市场价值元素以有效地动态监控和评价宏观风险状态,为危机预测提供依据。

关键词：危机预测企业金融结构法律制度宏观部门

来源：

维普期刊数据库

同方期刊数据库评论