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Journal of Energy Chemistry 2023年第8期83卷 229-238,I0007页

作者： dung tien Tuan Vu Jinsol Im Jae-Hee Kim Jisoo Han Gyeong Jun Chung Giang Thi Huong Nguyen Junhyeok Seo Minjae Kim Eui-Hyung Hwang Young-Gil Kwon Jae Wook Shin Kuk Young Cho Seung-Wan Song Department of Chemical Engineering&Applied Chemistry Chungnam National UniversityDaejeon 34134Republic of Korea Department of Materials Science&Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Fine Chem Co.Ltd. Daejeon 34365Republic of Korea d CSIM Co.Ltd. Yesan 32400Republic of Korea Dongwha Electrolyte Nonsan 32925Republic of Korea

Elevating the charge cut-off voltage beyond traditional 4.2 V is a commonly accepted technology to increase the energy density of Li-ion batteries(LIBs) but the risk of Li-dendrites and fire hazard increases as well. The use of ambi-functional additive, which forms stable solid electrolyte interphase(SEI) simultaneously at both cathode and anode, is a key to enabling a dendrites-free and well-working high-voltage LIB. Herein, a novel ambi-functional additive, pentaerythritol disulfate(PEDS), at 1 wt% without any other additive is demonstrated. We show the feasibility and high impacts of PEDS in forming lithium sulfateincorporated robust SEI layers at NCM523 cathode and graphite anode in 1 Ah-level pouch cell under4.4 V, 25 °C and 0.1 C rate, which mitigates the high-voltage instability, metal-dissolution and cracks on NCM523 particles, and prevents Li-dendrites at graphite anode. Improved capacity retention of 83%after 300 cycles is thereby achieved, with respect to 69% with base electrolyte, offering a promising path toward the design of practical high-energy LIBs.

关键词： Lithium-ion pouch cell Lithium plating-free High-voltage Ambi-functional additive SEI layer

Numerical evaluation of the use of vegetation as a shelterbelt for enhancing the wind and thermal comfort in peripheral and lateral-type skygardens in highrise buildings

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Building Simulation 2023年第2期16卷 243-261页

作者： Murtaza Mohammadi Paige Wenbin tien John Kaiser Calautit Department of Architecture and Built Environment University of NottinghamNottinghamUK

Skygardens or skycourts are a unique architectural intervention in the built environment,enhancing the social,economic,and environmental values of the *** allows occupants to connect and experience outdoor freshness within a semi-enclosed ***,skygardens located on a highrise building may generate intense wind gusts,endangering the safety of *** a validated computational fluid dynamics model,this study investigates the potential of various vegetative barriers or shelterbelts in attenuating the high wind speeds encountered in such spaces and the impact on wind and thermal *** skygarden configurations were investigated with and without vegetative barriers,simplified and modelled as porous zones,and their effect was studied on the velocity and temperature profile at the occupants’*** results indicate that while hedges and trees can offer resistance to airflow,trees provide higher temperature ***,a combination of vegetative and geometrical barriers provides the most optimal condition in the *** study has identified the importance of assessing wind attenuation characteristics of tree plantations on highrise skygarden,and the results can be used in designing intervention ***,vegetation can attenuate pollutants and mitigate poor air quality by surface deposition,and future studies should investigate in that direction.

关键词： built environment computational fluid dynamics(CFD) wind comfort thermal comfort skygarden

基于连续型定子磁链轨迹的异步牵引电机低转矩脉动控制算法

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电工技术学报 2015年第12期30卷 228-236页

作者：范文进-Pham Van tien 郑琼林杨中平林飞宋文胜 Do Viet dung 北京交通大学电气工程学院北京市海淀区100044 西南交通大学电气工程学院四川省成都市610031 交通运输大学机械系

本文提出了一种定子磁链轨迹优化的异步牵引电机基速以内的中高速区直接转矩控制(Direct Torque Control,DTC)算法。所提出DTC算法是从以改善转矩脉动角度出发,牵引电机在基速以内的中高速度运行阶段时,随着转速的增加,通过实现定子磁... 详细信息

本文提出了一种定子磁链轨迹优化的异步牵引电机基速以内的中高速区直接转矩控制(Direct Torque Control,DTC)算法。所提出DTC算法是从以改善转矩脉动角度出发,牵引电机在基速以内的中高速度运行阶段时,随着转速的增加,通过实现定子磁链轨迹从圆形-多边形-六边形的连续切换,获得转矩脉动小与平稳,磁链轨迹平滑、开关频率利用率以及谐波消除能力等的提高。该DTC算法仅需在传统DTC基础结构上仅增加定子磁链调节算法即可,因此它的主要优点是算法简单性,并保留了传统DTC算法快速动态响应,控制电路不复杂,对电机参数依赖性低等特征。理论分析和实验结果都证明了该连续型磁链轨迹的DTC算法的有效性和可行性。

关键词：直接转矩控制异步牵引电机减小转矩脉动优化磁链轨迹基速

Analytical modeling for colloid-facilitated transport of N-member radionuclides chains in the fractured rock

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Nuclear Science and Techniques 2007年第6期18卷 336-343页

作者： tien Neng-Chuan JEN Chun-Ping Energy and Environment Research Laboratories Industrial Technology Research Institute Hsinchu 310 Taiwan Department of Mechanical Engineering National Chung Cheng University Chia Yi 62102 Taiwan

A precious analytical model for N-member radionuclide decay chains has been extended to include the ef- fect of radionuclide sorption with groundwater *** distribution coefficients were employed in the nu- clide decay chain to illustrate the present *** colloid concentration was assumed constant in time and space owing to equilibrium between colloid generation and sedimentation by chemical and/or physical ***- thermore,the diffusion of colloids into the rock matrix was ignored because the diameter of colloid is relatively large and colloids and fracture surfaces are *** results indicated that colloids could facilitate the transport of radionuclides and the large adsorbability of nuclides with colloids enlarged the effect of acceleration by *** influence of colloids on the radionuclide transport was expected to be crucial to the actinides with large adsorbability; however,the present results revealed that the low-adsorbing nuclides whose parent nuclides have large capability of sorption could be also facilitated significantly by colloids ***,the role of colloids played in the transport of the radionuclides decay chain should be assessed carefully in the radioactive waste *** analyti- cal method presented herein is helpful to verify/validate further complex far-field models.

关键词：分析模型放射性核素氮元素同位素

Generating highly active oxide-phosphide heterostructure through interfacial engineering to break the energy scaling relation toward urea-assisted natural seawater electrolysis

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Journal of Energy Chemistry 2024年第10期97卷 687-699,I0014页

作者： Ngoc Quang Tran Nam Hoang Vu Jianmin Yu Khanh Vy Pham Nguyen Thuy tien Nguyen Tran Thuy-Kieu Truong Lishan Peng Thi Anh le Yoshiyuki Kawazoe Center for Innovative Materials and Architectures Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City 700000Vietnam Faculty of Materials Science and Technology University of ScienceHo Chi Minh City 700000Vietnam Department of Mechanical Engineering Hanbat National University(HBNU)Daejeon 34158Republic of Korea Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou 341119JiangxiChina School of Chemical Engineering-Hanoi University of Science and Technology Hanoi 10000Vietnam New Industry Creation Hatchery Center Tohoku UniversitySendai 980-8579Japan

Urea-assisted natural seawater electrolysis is an emerging technology that is effective for grid-scale carbon-neutral hydrogen mass production yet *** scaling relations is an effective strategy to break through the bottleneck of natural seawater ***,by DFT calculation,we demonstrated that the interface boundaries between Ni_(2)P and MoO_(2) play an essential role in the selfrelaxation of the Ni-O interfacial bond,effectively modulating a coordination number of intermediates to control independently their adsorption-free energy,thus circumventing the adsorption-energy scaling *** this conceptual model,a well-defined 3D F-doped Ni_(2)P-MoO_(2) heterostructure microrod array was rationally designed via an interfacial engineering strategy toward urea-assisted natural seawater *** a result,the F-Ni_(2)P-MoO_(2) exhibits eminently active and durable bifunctional catalysts for both HER and OER in acid,alkaline,and alkaline sea water-based *** in-situ analysis,we found that a thin amorphous layer of NiOOH,which is evolved from the Ni_(2)P during anodic reaction,is real catalytic active sites for the OER and UOR ***,such electrode-assembled urea-assisted natural seawater electrolyzer requires low voltages of 1.29 and 1.75 V to drive 10 and600 mA cm^(-2)and demonstrates superior durability by operating continuously for 100 h at 100 mA cm^(-2),beyond commercial Pt/C||RuO_(2) and most previous reports.

关键词： Interfacial engineering Break scaling relationships Doping Natural seawater splitting Urea electrolysis

Colloid-facilitated effects on migration of radionuclides in fractured rock with a kinetic solubility-limited dissolution model

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Nuclear Science and Techniques 2010年第6期21卷 339-346页

作者： Jen, Chun-ping tien, Neng-chuan Chung Cheng Univ Dept Mech Engn Taipei 62102 Taiwan Ind Technol Res Inst Energy & Environm Res Labs Hsinchu 31040 Taiwan

Nuclides can move with groundwater either as solutes or colloids,where the latter mechanism generally results in much shorter traveling time as the nuclides interact strongly with solid phases,such as *** the performance assessment,it is therefore essential to assess the relative importance of these two transport mechanisms for different *** relative importance of colloids depends on the nature and concentration of the colloids in ***(Pu),neptunium(Np),uranium(U) and americium(Am) are four nuclides of concern for the long-term emplacement of nuclear wastes at potential repository *** four actinides have a high potential for migrating if attached to iron oxide,clay or silica colloids in the *** sorption of the actinides by colloids in the groundwater may facilitate the transport of these nuclides along potential flow *** solubility-limited dissolution model can be used to assess the safety of the release of nuclear waste in geological disposal ***,it has been assumed that the solubility of the waste form is *** a nuclide reaches its solubility limit at an inner location near the waste form,it is unlikely that the same nuclide will reach its solubility limit at an outer location unless this nuclide has a parent *** is unlikely that the daughter nuclides will exceed their solubility limit due to decay of their parent *** present study investigates the effect of colloids on the transport of solubility-limited nuclides under the kinetic solubility-limited dissolution(KSLD) boundary condition in fractured *** release rate of the nuclides is proportional to the difference between the saturation concentration and the inlet aqueous concentration of the *** presence of colloids decreases the aqueous concentration of nuclides and,thus,increases the release flux of nuclides from the waste form.

关键词：核素迁移胶体浓度溶解度动力学裂隙岩体模型地下水溶质锕系元素

ON SERVICES RESEARCH AND EDUCATION

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Journal of Systems Science and Systems Engineering 2006年第3期15卷 257-283页

作者： James M.tien Daniel BERG Department of Decision Sciences and Engineering Systems Rensselaer Polytechnic Institute

The importance of the services sector can not be overstated; it employs 82.1 percent of the U. S. workforce and 69 percent of graduates from an example technological university. Yet, university research and education have not followed suit. Clearly, services research and education deserve our critical attention and support since services - and services innovation - serve as an indispensable engine for global economic growth. The theme of this paper is that we can and should build services research and education on what has occurred in manufacturing research （especially in regard to customization and intellectual property） and education; indeed, services and manufactured goods become indistinguishable as they are jointly co-produced in real-time. Fortunately, inasmuch as manufacturing concepts, methodologies and technologies have been developed and refined over a long period of time （i.e., since the 1800s）, the complementary set of concepts, methodologies and technologies for services are more obvious. However, while new technologies （e.g., the Internet） and globalization trends have served to enable, if not facilitate, services innovation, the same technologies （e.g., the Internet） and 21st Century realities （e.g., terrorism） are making services innovation a far more complex problem and, in fact, may be undermining previous innovations in both services and manufacturing. Finally, there is a need to define a ＂knowledge-adjusted＂ GDP metric that can more adequately measure the growing knowledge economy, one driven by intangible ideas and services innovation.

关键词： Services manufacturing customization innovation education intellectual property

Spatio-temporal changes of underground coal fires during 2008-2016 in Khanh Hoa coal field(North-east of Viet Nam) using Landsat time-series data

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Journal of Mountain Science 2018年第12期15卷 2703-2720页

作者： Tuyen Danh VU Thanh tien NGUYEN Department of Training Hanoi University of Natural Resources and Environment Faculty of Surveying Mapping and Geographic Information Hanoi University of Natural Resources and Environment

Underground coal fires are one of the most common and serious geohazards in most coal producing countries in the world. Monitoring their spatio-temporal changes plays an important role in controlling and preventing the effects of coal fires, and their environmental impact. In this study, the spatio-temporal changes of underground coal fires in Khanh Hoa coal field(North-East of Viet Nam) were analyzed using Landsat time-series data during the 2008-2016 period. Based on land surface temperatures retrieved from Landsat thermal data, underground coal fires related to thermal anomalies were identified using the MEDIAN+1.5×IQR(IQR: Interquartile range) threshold technique. The locations of underground coal fires were validated using a coal fire map produced by the field survey data and cross-validated using the daytime ASTER thermal infrared imagery. Based on the fires extracted from seven Landsat thermal imageries, the spatiotemporal changes of underground coal fire areas were analyzed. The results showed that the thermalanomalous zones have been correlated with known coal fires. Cross-validation of coal fires using ASTER TIR data showed a high consistency of 79.3%. The largest coal fire area of 184.6 hectares was detected in 2010, followed by 2014(181.1 hectares) and 2016(178.5 hectares). The smaller coal fire areas were extracted with areas of 133.6 and 152.5 hectares in 2011 and 2009 respectively. Underground coal fires were mainly detected in the northern and southern part, and tend to spread to north-west of the coal field.

关键词： Underground coal fires Spatio-temporal changes Khanh Hoa coal field (Viet Nam) Landsat time-series data

Application of Bidirectional Power Converters to Overcome Some Disadvantages of SVC Substation

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Journal of Energy and Power Engineering 2012年第12期6卷 2024-2030页

作者： Ngo Duc Minh le tien Phong Power System Department Electrical Faculty Thai Nguyen University of Technology Thai Nguyen 250000 Viet Nam

When the authors research on the fact that some SVC （static var compensator） substations connected at some buses in power system, they realized that some main functions ensured to operate well. Those are： compensate reactive power following value U＊ according to the requirements of the Vietnamese power system dispath center, flit harmonic by passive filter... However, it still has some disadvantages of this substation that need to be overcome： use large number of main devices, generate harmonics by itself, cause a lot of active power losses. Thus, the authors have an idea to solve these problems by applying a bidirectional power converter with having difference circuit structure and PWM （pulse width modulation） controller with SVM （space vector modulation） pulse generated section, so compensative current which is created by inductance element can be reserved, adjust continuos and always has full sinusoidal form, not generating harmonic. The benefit of this new solution is to eliminate the three above fundamental disadvantages. This new model is built based on authors＇ research about BESS （battery energy storage system）. The research results have been verified by simulations in Matlab/Simulink software.

关键词： SVC TSC TCR BDPC reactive power harmonic.

Flow-aware synthesis: A generic motion model for video frame interpolation

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Computational Visual Media 2021年第3期7卷 393-405页

作者： Jinbo Xing Wenbo Hu Yuechen Zhang tien-Tsin Wong Department of Computer Science and Engineering the Chinese University of Hong KongHong Kong SARChina Shenzhen Key Laboratory of Virtual Reality and Human Interaction Technology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesChina

A popular and challenging task in video research,frame interpolation aims to increase the frame rate of *** existing methods employ a fixed motion model,e.g.,linear,quadratic,or cubic,to estimate the intermediate warping ***,such fixed motion models cannot well represent the complicated non-linear motions in the real world or rendered ***,we present an adaptive flow prediction module to better approximate the complex motions in ***,interpolating just one intermediate frame between consecutive input frames may be insufficient for complicated non-linear *** enable multi-frame interpolation,we introduce the time as a control variable when interpolating frames between original ones in our generic adaptive flow prediction *** and quantitative experimental results show that our method can produce high-quality results and outperforms the existing stateof-the-art methods on popular public datasets.

关键词： flow-aware generic motion model video frame interpolation