检索结果-南通市图书馆

NANOSCALE PROCESS ENGINEERING

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

China Particuology 2003年第5期1卷 212-218页

作者： Qixiang Wang fei wei Department of Chemical Engineering Tsinghua UniversityBeijing 100084P.R.China

The research of nanoscale process engineering (NPE) is based on the interdisciplinary nature of nano-scale science and technology. It mainly deals with transformation of materials and energy into nanostructured materials and nanodevices, and synergizes the multidisciplinary convergence between materials science and technology, bio-technology, and information technology. The core technologies of NPE concern all aspects of nanodevice construction and operation, such as manufacture of nanomaterials by design? concepts and design of nanoarchitectures, and manufacture and control of customizable nanodevices. Two main targets of NPE at present are focused on nanoscale manufacture and concept design of nanodevices. The research progress of nanoscale manufacturing processes focused on creating nanostructures and assembling them into nanosystems and larger scale architectures has built the interdis-cipline of NPE. The concepts and design of smart, multi-functional, environmentally compatible and customizable nan-odevice prototypes built from the nanostructured systems of nanocrystalline, nanoporous and microemulsion systems are most challenging tasks of NPE. The development of NPE may also impel us to consider the curriculum and educa-tional reform of chemical engineering in universities.

关键词： nanoscale science and technology process engineering interdiscipline

在线全文

学校读者我要写书评

暂无评论

重型商用车中国工况油耗研究

内燃机与配件 2024年第2期 107-109页

作者：黄维斐上海机动车检测认证技术研究中心有限公司上海201805

本文简述了重型商用车油耗方法标准、限值标准和试验工况标准的发展历程;解释了重型车四阶段油耗限值标准对比现阶段限值标准的主要变化;对比分析了重型车不同车型中国工况和C_WTVC工况的车速、加速度、加减速比例等特征分布;分析了现... 详细信息

本文简述了重型商用车油耗方法标准、限值标准和试验工况标准的发展历程;解释了重型车四阶段油耗限值标准对比现阶段限值标准的主要变化;对比分析了重型车不同车型中国工况和C_WTVC工况的车速、加速度、加减速比例等特征分布;分析了现阶段重型商用车中国工况试验油耗结果,与C_WTVC工况油耗的平均结果、加权结果和重型车四阶段油耗限值进行对比,并提出节油意见。对于重型车在今后的技术路线调整,从而达到重型车四阶段油耗限值的要求有指导意义。

关键词：重型车中国工况重型车四阶段油耗

States of Carbon Nanotube Supported Mo-Based HDS Catalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2006年第3期15卷 203-210页

作者： Hongyan Shang Chenguang Liu Yongqiang Xu Jieshan Qiu fei wei Key Laboratory of Catalysis CNPC College of Chemistry and Chemical Engineering University of Petroleum Dongying 257061 China Carbon Research Laboratory Center for Nano Materials and Science Dalian University of Technology Dalian 116012 China Department of Chemical Engineering Tsinghua University Bejing 100085 China

The dispersion of the active phase and loading capacity of the Mo species on carbon nanotube （CNT） was studied by the XRD technique. The reducibility properties of Co-Mo catalysts in the oxide state over CNTs were investigated by TPR, while the sulfided Co-Mo/CNT catalysts were characterized by means of the XRD and LRS techniques. The activity and selectivity with respect to the hydrodesulfurization （HDS） performances on carbon nanotube supported Co-Mo catalysts were evaluated. It was found that the main active molybdenum species in the oxide state MoO3/CNT catalysts were MoO2, but not MoO3, as generally expected. The maximum loading before the formation of the bulk phase was lower than 6% （percent by mass, based on MoO3）. TPR studies revealed that the active species in the oxide state Co-Mo/CNT catalysts were reduced more easily at relatively lower temperatures in comparison to those of the Co-Mo/γ-Al2O3 catalysts, indicating that the CNT support promoted or favored the reduction of the active species. The active species of a Co-Mo-0.7/CNT catalyst were more easily reduced than those of the Co-Mo/CNT catalysts with Co/Mo atomic ratios of 0.2, 0.35, and 0.5, respectively, suggesting that the Co/Mo atomic ratio has a great effect on the reducibility of the active species. It was found that the incorporation of cobalt improved the dispersion of the molybdenum species on the support, and a phenomenon of mobilization and re-dispersion had occurred during the sulfurization process, resulting in low valence state Mo3S4 and Co-MoS2.17 active phases. HDS measurements showed that the Co-Mo/CNT catalysts were more active than the Co-Mo/γ-Al2O3 ones for the desulfurization of DBT, and the hydrogenolysis/hydrogenation selectivity of the Co-Mo/CNT catalysts was also much higher than those of the Co-Mo/γ-Al2O3. The Co-Mo/CNT catalyst with a Co/Mo atomic ratio of 0.7 showed the highest activity, whereas the catalyst with a Co/Mo atomic ratio of 0.35 had the highest selectivity.

关键词： carbon nanotubes XRD TPR HDS LRS

Nanoscale color sensors made on semiconducting multi-wall carbon nanotubes

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第5期9卷 1470-1479页

作者： Nan wei Huixin Huang Yang Liu Leijing Yang Fanglin Wang Huanhuan Xie Yingying Zhang fei wei Sheng Wang Lianmao Peng Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics Peking University Beijing 100871 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University Beijing 100084 China

亚微米颜色传感器被开发，用碳 nanotubes (CNT ) 。颜色传感器由一连串的二根光电二极管组成与不同光谱回答，使用制作在单个半导体的双墙 CNT 上控制了电的剥离开和没有药的技术。CNT 光电二极管展出内在的女人光谱从 640 ～ 2,100 n... 详细信息

亚微米颜色传感器被开发，用碳 nanotubes (CNT ) 。颜色传感器由一连串的二根光电二极管组成与不同光谱回答，使用制作在单个半导体的双墙 CNT 上控制了电的剥离开和没有药的技术。CNT 光电二极管展出内在的女人光谱从 640 ～ 2,100 nm，超过 60 dB 的大线性动态范围，和亚微米象素的回答缩放。这个方法探索多墙 CNT 的唯一的性质，并且可以乐意地为高效颜色传感器数组的大规模制造被使用，当平行多墙 CNT 的数组变得可得到时。

关键词：多壁碳纳米管颜色传感器半导体光电二极管阵列宽光谱响应双壁碳纳米管线性动态范围碳纳米管阵列

基于复杂流场的烟气流量测量技术数值模拟研究

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

热力发电 2024年第4期53卷 102-111页

作者：马修元韦飞宣添星王新培国电环境保护研究院有限公司江苏南京210031 国家能源集团科学技术研究院有限公司江苏南京210023

烟气流量是影响碳监测精度的关键因素之一,而分布不均、随机组负荷变化而改变的复杂流场环境是阻碍烟气流量精准计量的主要因素。以某电厂660 MW机组烟囱入口烟道为研究对象,基于烟气流场数值模拟结果对比分析了4种不同测量原理的流量... 详细信息

烟气流量是影响碳监测精度的关键因素之一,而分布不均、随机组负荷变化而改变的复杂流场环境是阻碍烟气流量精准计量的主要因素。以某电厂660 MW机组烟囱入口烟道为研究对象,基于烟气流场数值模拟结果对比分析了4种不同测量原理的流量计测量精度随点位数量、工艺布置形式等因素的影响变化规律。结果表明:与矩阵流量计相比,多点皮托管流量计对复杂流场环境的适应性更好;在测点数量同为28的情况下,矩阵流量计偏差是多点皮托管流量计的1.54倍;光闪烁流量计测量精度受安装位置标高影响较大,最大偏差是最小偏差的23.3倍,表明光闪烁流量计对复杂流场环境的适应性较差;超声波流量计可倾斜安装和多声道安装,工艺布置形式灵活多变,对复杂流场的适应性显著提高,双声道布置时可将偏差控制在±1.5%以内。研究成果为流量计设备选型及工艺设计提供了重要的理论依据和数据支撑,具有重要的理论研究及工程应用价值。

关键词：碳监测复杂流场流量计数值模拟工艺布置

Changes in interstitial fluid flow,mass transport and the bone cell response in microgravity and normogravity

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

Bone Research 2022年第4期10卷 696-714页

作者： fei wei Kendal Flowerdew Michael Kinzel Luigi EPerotti Jackson Asiatico Mahmoud Omer Candice Hovell Veerle Reumers Melanie J.Coathup Biionix Cluster Department of Internal MedicineCollege of MedicineUniversity of Central FloridaOrlandoFLUSA Marian University College of Osteopathic Medicine IndianapolisINUSA Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFLUSA Imec USA 194 NeoCity WyOrlandoFLUSA

In recent years,our scientific interest in spaceflight has grown exponentially and resulted in a thriving area of research,with hundreds of astronauts spending months of their time in space.A recent shift toward pursuing territories farther afield,aiming at near-Earth asteroids,the Moon,and Mars combined with the anticipated availability of commercial flights to space in the near future,warrants continued understanding of the human physiological processes and response mechanisms when in this extreme environment.Acute skeletal loss,more severe than any bone loss seen on Earth,has significant implications for deep space exploration,and it remains elusive as to why there is such a magnitude of difference between bone loss on Earth and loss in microgravity.The removal of gravity eliminates a critical primary mechano-stimulus,and when combined with exposure to both galactic and solar cosmic radiation,healthy human tissue function can be negatively affected.An additional effect found in microgravity,and one with limited insight,involves changes in dynamic fluid flow.Fluids provide the most fundamental way to transport chemical and biochemical elements within our bodies and apply an essential mechano-stimulus to cells.Furthermore,the cell cytoplasm is not a simple liquid,and fluid transport phenomena together with viscoelastic deformation of the cytoskeleton play key roles in cell function.In microgravity,flow behavior changes drastically,and the impact on cells within the porous system of bone and the influence of an expanding level of adiposity are not well understood.This review explores the role of interstitial fluid motion and solute transport in porous bone under two different conditions:normogravity and microgravity.

关键词： flow flow apply

A novel approach for the prevention of ionizing radiation-induced bone loss using a designer multifunctional cerium oxide nanozyme

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2023年第3期21卷 547-565页

作者： fei wei Craig J.Neal Tamil Selvan Sakthivel Yifei Fu Mahmoud Omer Amitava Adhikary Samuel Ward Khoa Minh Ta Samuel Moxon Marco Molinari Jackson Asiatico Michael Kinzel Sergey N.Yarmolenko Vee San Cheong Nina Orlovskaya Ranajay Ghosh Sudipta Seal Melanie Coathup Biionix Cluster Department of Internal MedicineCollege of MedicineUniversity of Central FloridaOrlandoFLUSA Advanced Materials Processing and Analysis Centre Nanoscience Technology Center(NSTC)Materials Science and EngineeringCollege of MedicineUniversity of Central FloridaOrlandoFLUSA CMC Materials 870 North CommonsDrAuroraILUSA Department of Chemistry Oakland UniversityRochesterMIMIUSA School of Applied Sciences Department of Chemical SciencesUniversity of HuddersfieldUK Department of Mechanical and Aerospace Engineering University of Central FloridaOrlandoFLUSA Engineering Research Center for Revolutionizing Biomaterials North Carolina A&T UniversityGreensboroNCUSA Department of Automatic Control and Systems Engineering Insigneo Institute for In Silico MedicineUniversity of SheffieldSheffieldS13JDUK

The disability,mortality and costs due to ionizing radiation(IR)-induced osteoporotic bone fractures are sub-stantial and no effective therapy exists.Ionizing radiation increases cellular oxidative damage,causing an imbalance in bone turnover that is primarily driven via heightened activity of the bone-resorbing osteoclast.We demonstrate that rats exposed to sublethal levels of IR develop fragile,osteoporotic bone.At reactive surface sites,cerium ions have the ability to easily undergo redox cycling:drastically adjusting their electronic con-figurations and versatile catalytic activities.These properties make cerium oxide nanomaterials fascinating.We show that an engineered artificial nanozyme composed of cerium oxide,and designed to possess a higher fraction of trivalent(Ce^(3+))surface sites,mitigates the IR-induced loss in bone area,bone architecture,and strength.These investigations also demonstrate that our nanozyme furnishes several mechanistic avenues of protection and selectively targets highly damaging reactive oxygen species,protecting the rats against IR-induced DNA damage,cellular senescence,and elevated osteoclastic activity in vitro and in vivo.Further,we reveal that our nanozyme is a previously unreported key regulator of osteoclast formation derived from macrophages while also directly targeting bone progenitor cells,favoring new bone formation despite its exposure to harmful levels of IR in vitro.These findings open a new approach for the specific prevention of IR-induced bone loss using synthesis-mediated designer multifunctional nanomaterials.

关键词： Ionizing radiation Osteoporosis Nanozyme Cerium oxide Bone strength Bone resorption

Electrochemical process of sulfur in carbon materials from electrode thickness to interlayer

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

Journal of Energy Chemistry 2019年第4期28卷 119-124页

作者： Xiaonan Tang Zhenhua Sun Huicong Yang Haitao Fang fei wei Hui-Ming Cheng Shuping Zhuo Feng Li School of Chemical Engineering Shandong University of Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China School of Materials Science and Engineering Harbin Institute of Technology Department of Chemical Engineering Tsinghua University Tsinghua-Berkeley Shenzhen Institute Tsinghua University

Lots of efforts have been done on different porous carbon materials as cathode for Lithium–sulfur(Li–S)battery. However, seldom researches have been done on the relationship between cathode thickness and electrochemical performance. Our work investigates the relation between electrochemical performance and cathode thickness with typical porous carbon materials. We explain the phenomenon that only a modest cathode thickness can have the most adequate electrochemical reaction trend through the aspect of thermodynamics(chemical potential) so that the best electrochemical performance can be obtained.Besides, interlayer can remit the shuttle effect but hinder the lithium ion diffusion process simultaneously. And we verify the effect of interlayer thickness on the shuttle effect and lithium ion diffusion process.

关键词： Lithium-sulfur battery Electrochemical reaction Cathode thickness Chemical potential Ion diffusion

A Lunar-based Soft X-ray Imager(LSXI)for the Earth's magnetosphere

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第7期64卷 1026-1035页

作者： Yihong GUO Chi WANG fei wei Tianran SUN Xizheng YU Songwu PENG Graziella BRANDUARDI-RAYMONT Steven SEMBAY National Space Science Center Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Mullard Space Science Laboratory University College LondonSurrey RH56NTUK Department of Physics and Astronomy University of LeicesterLeicester LEI 7RHUK

We propose to use the Moon as a platform to obtain a global view of Earth's magnetosphere by a Lunar-based Soft X-ray Imager(LSXI).LSXI is a wide field-of-view Soft X-ray telescope,which can obtain X-ray images of Earth's magnetosphere based on the solar wind charge exchange(SWCX)X-ray emission.Global perspective is crucial to understand the overall interaction of the solar wind with magnetosphere.LSXI is capable of continuously monitoring the evolution of geospace conditions under the impact of the solar wind by simultaneous observation of the bow shock,magnetosheath,magnetopause and cusps for the first time.This proposal is answering the call for the Chinese Lunar Exploration Program Phase IV.

关键词： Soft X-ray imager Lunar Magnetosphere Micro-pore optics