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Two-Dimensional Transient Thermal Analysis of a Phase-Change-Material Canister of a Heat-Pipe Receiver under Gravity

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Journal of Thermal Science 2010年第2期19卷 160-166页

作者： Xiaohong GUI Wei QU Bin LIN Xiugan YUAN institute of engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China University of Notre Dame Notre Dame IN 46556 USA institute of man-machine-environment engineering Beihang University Beijing 100191 China

High-temperature Phase Change Material (PCM) is used as a thermal storage medium of a heat-pipe receiver in an advanced solar dynamic *** both void cavity and natural convection considered,thermal performance of the heat-pipe receiver is numerically analyzed under *** results indicate that the PCM contained in the integrated heat pipe performs an averaging function of heat *** thermal performance of the heat-pipe receiver is stable and *** a heating cycle is stable,the temperature fluctuations both on heat-pipe wall and in PCM canister remain less than 13 K throughout a sunlight and eclipse *** utility of PCM is essentially *** maximum melting ratio of PCM is 92%.Under gravity,PCM melts more quickly with the effect of natural *** convection accelerates the process of phase *** results are compared with the experimental results *** accuracy of numerical model under gravity is *** experiment for the PCM canister on the ground can be well prepared with our numerical simulation.

关键词： Heat-pipe Receiver Phase Change Material Void Cavity Natural Convection

Effect of chlorine content of chlorophenols on their adsorption by mesoporous SBA-15

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Journal of environmental Sciences 2012年第8期24卷 1411-1417页

作者： Qingdong Qin Ke Liu Dafang Fu Haiying Gao School of Civil engineering Southeast UniversityNanjing 210096China Department of man-machine and environment engineering Nanfing University of Aeronautics and AstronauticsNanfing 210016China

Studies on the effect of the chlorine content of chlorophenols （CPs） on their adsorption from aqueous solution by mesoporous SBA-15 are important in understanding the mechanisms of CP adsorption. In this study, three CPs with different degrees of chlorine content （i.e., 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol） were investigated. The effects of parameters such as temperature and solution pH were studied. The results showed that CP adsorption by SBA- 15 increased with increasing number of chlorine substituents and depended strongly on the temperature and solution pH. Thermodynamic parameters such as Gibbs free energy change （AGO）, enthalpy change （△H^0） and entropy change （△S^0） were also calculated. By comparison of the adsorption coefficient of CPs with varying physical-chemical properties （size, hydrophobicity and electron density）, we propose that hydrophobic interactions between CPs and the SBA-15 surface, as well as electron donor-acceptor （EDA） complexes between oxygen of the siloxane surface of SBA-15 （e--donor） and the n-system of the CPs （e--acceptor）, were dominant adsorption mechanisms.

关键词： chlorophenols mesoporous SBA-15 adsorption pH temperature

Synergistic removal of nitrogen monoxide by non-thermal plasma and catalyst simultaneously

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Journal of environmental Sciences 2005年第5期17卷 846-848页

作者： YU Gang YU Qi ZENG Ke-si ZHAI Xiao-dong Department of man-machine and environment engineering College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016 China College of environmental and Chemical engineering Wuhan Institute of Science and Technology Wuhan 430074 China

An experimental system of De-NO with plasma-catalyst（Cu zeolite） was established to investigate the differences between De- NO with plasma-catalyst and De-NO only with plasma, to provide the instruction for selecting appropriate catalyst and operating condition, The characteristics of De-NO with plasma and De-NO with plasma-catalyst were investigated comparatively by experiments. The experimental results show that De-NO with plasma-catalyst has high NO removal rate; Cu zeolite is an effective catalyst which can promote NO removal rate in plasma remarkably; De-NO with plasma-catalyst should be operated at low temperature and the temperature has opposite effects on the function of catalvst and plasma; water vapor and O2 can increase the NO removal rate.

关键词： nitrogen monoxide( NO) synergistic removal non-thermal plasma catalyst De-NO

Chronically monitoring the deep brain rhythms: from stimulation to recording

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Science Bulletin 2016年第19期61卷 1522-1524页

作者： Xing Qian Yue Chen Bozhi Ma Hongwei Hao Luming Li National engineering Laboratory of Neuromodulation Tsinghua University man-machine-environment engineering institute School of Aerospace Engineering Tsinghua University Precision Medicine & Healthcare Research Center Tsinghua-Berkeley Shenzhen Institute Center of Epilepsy Beijing Institute for Brain Disorders

Humans have never stopped exploring their brains,one of the most complex systems in nature.A thorough understanding of the brain is the ultimate challenge for *** there is a rapid increase in the aging populations and... 详细信息

关键词：大脑长期监测节律深部神经连接人口老龄化脑部疾病人的行为

Simultaneous removal of NO and SO_2 from dry gas stream using non-thermal plasma

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Journal of environmental Sciences 2007年第11期19卷 1393-1397页

作者： YU Qi YANG Hong-min ZENG Ke-si ZHANG Zhen-wei YU Gang College of Chemical engineering Wuhan University of Science and Engineering Wuhan 430073 China Department of Power engineering Nanjing Normal University Nanjing 210042 China Department of man-machine and environment engineering College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In order to investigate the feasibility of sequential removal NO and SO2 using non-thermal plasma and adsorbent simultaneously, the removal of NO and SO2 from dry gas stream （NO/SO2/N2/O2） with very little O2 using non-thermal plasma was investigated using a coaxial dielectric barrier discharge. Comparative experiments were carried out in the dry gas stream with and without Ar respectively at O2 concentration of 0.1%. The results showed that NO could be removed remarkably and it would be enhanced in the presence of Ar in the dry gas stream. It seems that SO2 could not be removed unless there is Ar in the dry gas stream. The mechanism of removal of NO and SO2 in the dry gas stream was discussed.

关键词： NO SO2 non-thermal plasma dry gas stream simukaneous removal

Structural Analysis and Calculation for the Radiation Baffle of Cryopumps

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Plasma Science and Technology 2005年第4期7卷 2929-2931页

作者：王娟欧阳峥嵘朱武胡纯栋 institute of man-machine-environment Beijing University of Aeronautics and Astronautics Beijing 100083China institute of Plasma Physics the Chinese Academy of Science Hefei 230031China Hefei University of Technology Hefei 230029 China

To decrease the radiation heat load of the cryopanel is considered to be necessary for the design of cryopumps. In general, a radiation baffle is mounted between the cryopanel and the heat source. The radiation baffle absorbs the majority of the radiated heat load. However, the motion of molecules to be pumped is baffled and the pumping speed is lowered at the same time. Therefore the selection of a good radiation baffle is a very important issue for the economical operation of the cryopump. By calculating and comprehensively analyzing the thermal transmission coefficients and the molecular transmission coefficients of baffles of different structures, a type of Chevron baffle is found to be more satisfactory. This paper focuses on the application of the Monte Carlo Method involved in the process of analysis and calculation.

关键词： radiation baffle Monte Carlo Method transmission coefficient design of cryopumps

Integration of structural simulations into a real-time capable Overall System Simulation for complex mechatronic systems

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第2期10卷 21-41页

作者： Dorit Kaufmann Juergen Rossmann institute for man-machine Interaction RWTH Aachen University Ahornstrasse 5552074 AachenGermany

To meet the rising demand of performing complex tasks in a highly technologized world,the development of mechatronic systems faces two major challenges:First,the system is integrated in a fast changing environment and has to cope with dynamically modified tasks and *** the same time,the development of new methods has to be fast,cost-effective and *** taking care of both aspects simultaneously,simulations have become an acknowledged tool to cost-effectively and rapidly test and optimize new solutions for complex mechatronic systems,as they are common in,e.g.,***,simulation methods are specialized for one purpose and thus used as a stand-alone tool to analyze the behavior of single components or certain aspects of the whole *** with size and complexity of the system,the susceptibility to errors rises when the interaction between components *** a component shows minimal deviations to its nominal behavior,huge interdependencies between components of complex systems might cause system *** structural behavior of a single component is therefore as crucial to the functionality of the whole system as the interplay of all *** aspects have to be analyzed in parallel,which is nowadays barely ***,this work presents the integration of structural simulations into the overall *** developed approach consists of a concept,an implementation and the validation for an automated bidirectional interaction to integrate results from Finite Element Analysis(FEA)into an existing,real-time capable Overall System Simulation for mechatronic systems in general and robotics in particular.

关键词： Overall System Simulation structural simulations bidirectional interaction

Study on Characteristics of the Wheelchair-User Combination

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Journal of Biosciences and Medicines 2016年第6期4卷 9-17页

作者： Zerui Xiang Jinyi Zhi Shiyu Dong Bochu Xu institute of Design and Research for man-machine-environment engineering System Southwest Jiaotong University Chengdu China

To summarize the characteristics of wheelchair-user combination, this paper studied wheelchairs, wheelchair users, nursing staffs and interaction relationship between them. Firstly, the findings of some research on wheelchairs and wheelchair users were investigated, and the studies in four aspects of wheelchairs and their accessories, wheelchair users, wheelchairs and wheelchair users (man-machine system), and skills training for the performance of wheelchair were reviewed. Then “wheelchair-user combination” was put forward based on the relationship between wheelchairs and wheelchair users in real life, and the “wheelchair-user combination” was divided into “WUs-Ws system” and “WUs-Ws-NSs system” according to whether the nursing staffs were needed. Finally, this paper analytically studied the characteristics of wheelchair users, characteristics in use of wheelchair and characteristics of nursing staffs, as well as put forward the characteristics of the wheelchair-user combination.

关键词： Wheelchair-User Combination Wheelchair Users Nursing Staffs Wheelchairs Wheelchair Ergonomics

采用Gd_2O_2S回热填料的带预冷4K斯特林型高频脉管制冷机性能研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2014年第7期15卷 508-516页

作者： Zhuo-pei LI Yan-long JIANG Zhi-hua GAN Li-min QIU Jie CHEN man-machine environment engineering College of Aerospace EngineeringNanjing University of Aeronautics and Astronautics institute of Refrigeration and Cryogenics Zhejiang University Nanjing Cooltech Cryogenic Technology Co. Ltd.

研究目的:研究新型磁性回热填料Gd2O2S对液氦温区高频脉管制冷机多级回热器损失特性的影响。创新要点:确定了不同回热填料以及运行参数(频率、平均压力)下液氦温区多级脉管制冷机的制冷温度和各级预冷量,进一步明确了4 K高频回热损失机... 详细信息

研究目的:研究新型磁性回热填料Gd2O2S对液氦温区高频脉管制冷机多级回热器损失特性的影响。创新要点:确定了不同回热填料以及运行参数(频率、平均压力)下液氦温区多级脉管制冷机的制冷温度和各级预冷量,进一步明确了4 K高频回热损失机理。研究方法:采用理论研究与实验验证相结合的方法,基于一台两级G-M型低频脉管制冷机预冷的单极斯特林型高频脉管制冷机,研究多级回热器在高频以及4 K温区下的损失特性。选取新型回热填料Gd2O2S替代部分回热填料HoCu2,比较回热器采用两种填料时在不同运行频率及平均压力下的冷端制冷温度(图10)、各级预冷量和预冷温度(图11–12)。重要结论:采用孔隙率较小的新型磁性回热填料Gd2O2S可显著改善第一级回热器内压力波与质量流的相位关系,从而减小该级回热损失。减小平均压力可以降低制冷机无负荷制冷温度并减小第二级预冷量,但制冷工质氦的体积比热容会急剧增大,从而使低温级回热器的换热对频率非常敏感。此外,频率对高温级回热器的回热特性影响不明显。该方法可以为三级斯特林型4 K多级脉管制冷机提供设计依据。

关键词：斯特林型脉管制冷机回热填料 4K 高频预冷低温惯性管