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Novel N-doped multichannel carbon nanofiber architecture with porous CoS nanoprisms for high-performance potassium-ion batteries

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Rare Metals 2024年第3期43卷 971-983页

作者： Jae Bong lim Seung-Keun Park Department of Advanced Materials Engineering Chung-Ang UniversityGyeonggi-do17546Republic of Korea Department of Intelligence Energy and Industry Chung-Ang UniversitySeoul06974Republic of Korea Western Seoul Center Korea Basic Science InstituteSeoul03759Republic of Korea

Potassium-ion batteries(PIBs)have gained significant attention as an alternative to lithium-ion batteries(LIBs)due to the abundance of potassium(K)and low ***,the difficulty in finding appropriate electrode materials that can efficiently store the larger K ions has hindered their practical ***,we report a novel anode material,N-doped multichannel carbon nanofibers embedded with porous CoS nanoprisms(CSP@NMCNF),for high-performance *** CSP@NMCNF was synthesized using a two-step strategy comprising of the electrospinning of Co acetate hydroxide nanoprism/binary polymer blend and a subsequent heat *** porous CoS nanoprisms with an anisotropic morphology were well aligned along the length axis of the N-doped multichannel carbon nanofibers,thus ensuring their structural stability during the repeated charge-discharge *** addition,numerous pores facilitated the transport of electrons and ***,the CSP@NMCNF anode exhibited excellent electrochemical performance,delivering a high specific capacity of 368 mAh·g^(-1)at 0.5 A·g^(-1)after 200 cycles and excellent rate capability(232 mAh·g^(-1)at 2.0 A·g^(-1)).

关键词： K-ion batteries Cobalt sulfide Multichannel structured composite Electrospinning Nanoprism Porous structure

Reconfigurable transmissive metasurface with a combination of scissor and rotation actuators for independently controlling beam scanning and polarization conversion

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Microsystems & Nanoengineering 2024年第2期10卷 173-180页

作者： Chhunheng Lor Ratanak Phon Sungjoon lim Intelligent Semiconductor Engineering Chung-Ang UniversityHeukseok-DongDongjak-GuSeoul06974Republic of Korea School of Electrical and Electronic Engineering Chung-Ang UniversityHeukseok-DongDongjak-GuSeoul06974Republic of Korea

Polarization conversion and beam scanning metasurfaces are commonly used to reduce polarization mismatch and direct electromagnetic waves in a specific direction to improve the strength of a wireless ***,identifying suitable active and mechanically reconfigurable metasurfaces for polarization conversion and beam scanning is a considerable challenge,and the reported metasurfaces have narrow scanning ranges,are expensive,and cannot be independently *** this paper,we propose a reconfigurable transmissive metasurface combined with a scissor and rotation actuator for independently controlling beam scanning and polarization conversion *** metasurface is constructed with rotatable unit cells(UCs)that can switch the polarization state between right-handed(RHCP)and left-handed circular polarization(LHCP)by flipping the UCs to reverse their phase ***,independent beam scanning is achieved using the scissor actuator to linearly change the distance between the *** and experimental results confirm that the proposed metasurface can perform beam scanning in the range of 28°for both the positive and negative regions of a radiation pattern(RHCP and LHCP beams)at an operational frequency of 10.5 GHz.

关键词： beam rotation controlling

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榴莲蜜变温间歇干燥

干燥技术与设备 2013年第1期11卷 23-42页

作者： Chong Chien Hwa law chung lim 董宝宝(译) 徐庆(校) 马来西亚泰勒大学化学工程系雪兰莪州47500 诺丁汉大学马来西亚分校化学与环境工程系雪兰莪州43500 天津科技大学机械工程学院天津300222

新鲜的榴莲蜜舍糖量高，水分多，是一种很容易腐烂的水果。为了能够延长贮存时间必须降低含水量。由于舍糖量高，当用传统的热风干燥进行干燥时，榴莲蜜表面会出现焦糖化。为了克服这个问题，在干燥的开始阶段应用间歇热泵干燥机，在干... 详细信息

新鲜的榴莲蜜舍糖量高，水分多，是一种很容易腐烂的水果。为了能够延长贮存时间必须降低含水量。由于舍糖量高，当用传统的热风干燥进行干燥时，榴莲蜜表面会出现焦糖化。为了克服这个问题，在干燥的开始阶段应用间歇热泵干燥机，在干燥中期应用低温的除湿空气。结果表明：利用循环温度和递升温度干燥的样品湿含量可降低到0．081—0．110（g水／g干物质k此研究中用有限差分法来估算有效扩散系数值，较好地模拟了干燥动力学数据。就产品质量而雷，在循环温度干燥中减少热风干燥时间可生产柔软的干燥产品。而且，低温除湿空气的缓苏作用能减少干燥样品的总体颜色变化。

关键词：榴莲蜜低温除湿空气有限差分法有效扩散系数产品质量总颜色变化

Vacuum-free lamination via controlled polymer adhesion for selective photogeneration and photodetection

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Carbon Energy 2024年第7期6卷 205-218页

作者： Min Soo Kim Jihyun lim Woongsik Jang Dong Hwan Wang Department of Intelligent Semiconductor Engineering Chung-Ang UniversitySeoulRepublic of Korea School of Integrative Engineering Chung-Ang UniversitySeoulRepublic of Korea

This study attempts to develop a reproducible thin-film formation technique called vacuum-free(VF)lamination,which transfers thin films using elastomeric polymer-based laminating ***,by controlling the interface characteristics of the mediator based on the work of adhesion,VF lamination is successfully performed for various thicknesses(from 20 to 240 nm)of a conjugated photoactive material composed of poly[(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-bʹ]dithiophene))-alt-(5,5-(1ʹ,3ʹ-di-2-thienyl-5ʹ,7ʹ-bis(2-ethylhexyl)benzo[1ʹ,2ʹ-c:4ʹ,5ʹ-cʹ]dithiophene-4,8-dione)](a polymer donor)and 2,2ʹ-((2Z,2ʹZ)-((12,13-bis(2-butyloctyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2ʹʹ,3ʹʹ:4ʹ,5ʹ]thieno[2ʹ,3ʹ:4,5]pyrrolo[3,2-g]thieno[2ʹ,3ʹ:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(a nonfullerene acceptor).Interestingly,the organic photovoltaic and photodetecting applications,prepared by the VF lamination process,showed superior performance compared to those of devices prepared by conventional *** is due to the overturned surface morphology,which led to enhanced charge transport ability and blocking of the externally injected ***,the reproducible VF lamination process,exploiting an adhesion-based elastomeric polymer mediator,is a promising thin-film formation technique for developing efficient next-generation organic optoelectronic materials consistent with the solution process.

关键词： conjugated nonfullerene acceptor photodetectors photovoltaics polymer vacuum-free lamination

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钒钛铁尾矿制备绿色建筑材料的研究进展

材料导报 2024年第19期38卷 115-124页

作者：田小平王长龙 Hidayati Asrah lim chung Han 平浩岩齐洋马锦涛荆牮霖刘治兵郑永超翟玉新刘枫河北工程大学土木工程学院河北邯郸056038 马来西亚沙巴大学工程学院沙巴哥打京那巴鲁88400 北京建筑材料科学研究总院有限公司固废资源化利用与节能建材国家重点实验室北京100041 中铁建设集团有限公司北京100040 中铁建设集团建筑发展有限公司北京100070

钒钛磁铁矿是以铁、钒、钛为主的多金属元素共生的复合矿,在世界分布不均衡。中国是该矿石的主要产出国之一,该矿石分布在五个主要矿带。钒钛铁尾矿是钒钛磁铁矿选矿过程中产生的固体工业废弃物,是一种多金属伴生的铁尾矿。该尾矿在中... 详细信息

钒钛磁铁矿是以铁、钒、钛为主的多金属元素共生的复合矿,在世界分布不均衡。中国是该矿石的主要产出国之一,该矿石分布在五个主要矿带。钒钛铁尾矿是钒钛磁铁矿选矿过程中产生的固体工业废弃物,是一种多金属伴生的铁尾矿。该尾矿在中国的堆存量巨大,富含很多有用化学组分,也被称为人工矿床。该尾矿以硅酸盐为主,主要化学成分是二氧化硅、三氧化二铝、氧化钙和氧化铁等,主要矿物是脉石矿物。国内外学者对其在绿色建筑材料综合利用方面做了很多有益探索,但总体来看,这些研究更多停留在实验室里。主要原因是(1)不同尾矿库甚至同一尾矿库的钒钛铁尾矿理化性能可能有较大差异,尾矿原料的稳定性不足;(2)受尾矿原料不稳定的理化性能影响,中试结果经常出现较大差异,难以实现规模化利用;(3)钒钛铁尾矿库大多地处偏僻,运输成本高,且缺乏高附加值的尾矿产品,规模以上企业因投入大产出小望而生畏。本文综述了钒钛铁尾矿在中国的地域分布和堆存量,重点研究了其化学组成、矿物组成、粒度分布和重金属浸出,分析了其作为主要原料在绿色建筑材料方面的研究进展,指出了存在问题并展望了发展前景。

关键词：钒钛磁铁矿钒钛铁尾矿绿色建筑材料混凝土矿物掺合料

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Drying kinetics of technical specified rubber

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Information Processing in Agriculture 2015年第1期2卷 64-71页

作者： Mei Xiang Ng Thing Chai Tham Sze Pheng Ong chung lim law University of Nottingham Malaysia Campus Jalan Broga43500 SemenyihSelangorMalaysia

This paper reports the study of crumb rubber drying in different experimental *** is important to understand the characteristics of crumb rubber drying in order to formulate a better drying strategy that could give higher energy *** experiments were carried out with constant heat at maximum 100℃ and a stainless steel container was used to hold the sample of crumb rubber under *** surface temperature profile of the rubber was investigated using two types of drying methods,normal hot air drying and vacuum *** was found that when the sample was dried,external surface temperature for drying with hot air dryer was higher than vacuum *** results showed the evolution of temperature profile was not in good agreement with the prediction which revealed that there was no temperature gradient within the drying *** energy consumption for vacuum drying was higher compared to hot air drying,where there was a difference of 0.7079 MJ/kg H2O evaporated for drying temperature at 100℃.The best fit model generated from the experimental data was the modified Henderson and Pabis model and the highest effective diffusivity obtained was 5.243×10^-9m^2/s heating by vacuum oven at 90℃ under zero atmospheric pressure.

关键词： Crumb rubber Drying characteristic Mathematical modeling

Preliminary nitrite, nitrate and colour analysis of Malaysian edible bird’s nest

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Information Processing in Agriculture 2015年第1期2卷 1-5页

作者： Meei Chien Quek Nyuk Ling Chin Yus Aniza Yusof Sheau Wei Tan chung lim law Department of Process and Food Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Laboratory of Vaccines and Immunotherapeutics Institute of BioscienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Chemical Engineering Faculty of EngineeringUniversity of NottinghamMalaysia CampusJalan Broga43500 SemenyihSelangorMalaysia

The high nitrite content in edible bird’s nests is a major concern to the local swiftlet *** lowers the price of the edible bird’s nests and it brings severe health hazards to consumers and *** research investigated the nitrite and nitrate contents of eight types of local edible bird’s nests by using ion chromatography system and evaluating its colour using the CIE system in L^*a^*b^**** nitrite content obtained ranged from 5.7 lg/g for the house nests to 843.8 lg/g for the cave *** nitrate content for the house and cave nests was 98.2 lg/g and 36,999.4 lg/g,*** cave nests with darker and redder colour had higher nitrite and nitrate contents than the brighter and more yellow house *** likely suggests that the nitrite and nitrate contents have correlations with edible bird’s nests *** studies suggested that the nitrite content had high correlations with colour parameters,L^*a^*b^*of edible bird’s nests at significant level of P<*** findings suggest that edible bird’s nests’colour may be a useful indicator for measuring nitrite and nitrate contaminations.

关键词： Nitrite Nitrate Colour Ion chromatography Edible bird’s nest

Knowledge-driven decision analytics for commercial banking

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Journal of Management Analytics 2020年第2期7卷 209-230页

作者： K.S.law Fu-Lai chung Department of Computing Hong Kong Polytechnic UniversityHong KongChina

Although the corporate relationship manager seems to be the key enabler in commercial banking,the personal relationship sales model is not a sustainable model for the paradigm shift in digital financial *** this research,we propose a knowledge-driven decision analytics approach to improve the decision ***,most of the corporate client documents processed in banks are not well-structured and the traditional analysis approach does not consider the document structure,which carries rich semantic *** propose a document structure-based text representation approach with incorporating auxiliary information in the predictive analytics of unstructured data to improve the performance in the document classification *** proposed approach significantly outperforms the traditional whole document approach which does not take into considerations of the document *** the proposed approach,knowledge can be effectively and efficiently used for business decisions and planning to improve the competitive advantage and substantiality of banks.

关键词： document classification information retrieval informatics document structure analysis auxiliary information

Automatic Discontinuity Classification of Wind-turbine Blades Using A-scan-based Convolutional Neural Network

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Journal of Modern Power Systems and Clean Energy 2021年第1期9卷 210-218页

作者： Jiyeon Choung Sun lim Seung Hwan lim Su chung Chi Mun Ho Nam Korea Electronics Technology Institute 401-402Bucheon Technopark655Pyeongcheon-roWonmi-guBucheon-siGyeonggi-do 14502Korea Sam Yong Inspection Engineering Co.Ltd.

Recent development trends in wind power generation have increased the importance of the safe operation of wind-turbine blades(WTBs). To realize this objective, it is essential to inspect WTBs for any defects before they are placed into operation. However, conventional methods of fault inspection in WTBs can be rather difficult to implement, since complex curvatures that characterize the WTB structures must ensure accurate and reliable inspection. Moreover, it is considered useful if inspection results can be objectively and consistently classified and analyzed by an automated system and not by the subjective judgment of an inspector. To address this concern,the construction of a pressure-and shape-adaptive phased-array ultrasonic testing platform, which is controlled by a nanoengine operation system to inspect WTBs for internal defects, has been presented in this paper. An automatic classifier has been designed to detect discontinuities in WTBs by using an A-scanimaging-based convolutional neural network(CNN). The proposed CNN classifier design demonstrates a classification accuracy of nearly 99%. Results of the study demonstrate that the proposed CNN classifier is capable of automatically classifying the discontinuities of WTB with high accuracy, all of which could be considered as defect candidates.

关键词： Wind-turbine blade(WTB) blade inspection platform convolutional neural network(CNN) discontinuity phased-array ultrasonic testing(PAUT) A-scan