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Self-actuating protection mechanisms for safer lithium-ion batteries

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Journal of Energy Chemistry 2024年第7期94卷 181-198页

作者： Yang luo Chunchun Sang Kehan Le Hao Chen Hui Li Xinping Ai Hubei Key Lab of Electrochemical Power Sources College of Chemistry&Molecular ScienceWuhan UniversityWuhan 430072HubeiChina state Key Laboratory of New Textile Materials&Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200HubeiChina

Safety issue is still a problem nowadays for the large-scale application of lithium-ion batteries(LIBs)in electric vehicles and energy storage *** unsafe behaviors of LIBs arise from the thermal run-away,which is intrinsically triggered by the overcharging and *** improve the safety of LIBs,various protection strategies based on self-actuating reaction control mechanisms(SRCMs)have been proposed,including redox shuttle,polymerizable monomer additive,potential-sensitive separator,thermal shutdown separator,positive-temperature-coefficient electrode,thermally polymerizable addi-tive,and reversible thermal phase transition *** build-in protection mechanisms,these meth-ods can sensitively detect either the temperature change inside battery or the potential change of the electrode,and spontaneously shut down the electrode reaction at risky conditions,thus preventing the battery from going into thermal *** their advantages in enhancing the intrinsic safety of LIBs,this paper overviews the research progresses of SRCMs after a brief introduction of thermal runaway mechanism and limitations of conventional thermal runaway mitigating *** importantly,the current states and issues,key challenges,and future developing trends of SRCTs are also discussed and outlined from the viewpoint of practical application,aiming at providing insights and guidance for developing more effective SRCMs for LIBs.

关键词： Li-ion battery Safety Thermal runaway Thermal protection Overcharge protection

Enhanced CMOS image sensor by flexible 3D nanocone anti-reflection film

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Science Bulletin 2017年第2期62卷 130-135页

作者： Li Tian Xiaolei luo Min Yin Dongdong Li Xinzhong Xue Hui Wang Shanghai Advanced Research Institute Chinese Academy of Sciences School of Environmental and Chemical Engineering Shanghai University

Complementary metal oxide semiconductor(CMOS) image sensors(CIS) are being widely used in digital video cameras, web cameras, digital single lens reflex camera(DSLR), smart phones and so on, owing to their high level of integration, random accessibility, and low-power operation. It needs to be installed with the cover glass in practical applications to protect the sensor from damage, mechanical issues,and environmental conditions, which, however, limits the accuracy and usability of the sensor due to the reflection in the optical path from air-to-cover glass-to-air. In this work, the flexible 3D nanocone anti-reflection(AR) film with controlled aspect ratio was firstly employed to reduce the light reflection at air/cover glass/air interfaces by directly attaching onto the front and rear sides of the CIS cover *** both the front and rear sides of cover glass were coated by the AR film, the output image quality was found to be improved with external quantum efficiency increased by 7%, compared with that without AR film. The mean digital data value, root-mean-square contrast, and dynamic range are increased by45.14%, 38.61% and 57, respectively, for the output image with AR films. These results provide a novel and facile pathway to improve the CIS performance and also could be extended to rational design of other image sensors and optoelectronic devices.

关键词： CMOS image sensor Nancone anti-reflection film Quantum efficiency Digital data value Root-mean-square contrast

License Assisted Access-WiFi Coexistence with TXOP Backoff for LTE in Unlicensed Band

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China Communications 2017年第3期14卷 1-14页

作者： Salman Saadat Da Chen Kai luo Mingjie Feng Tao Jiang School of Electronics Information and Communications Huazhong University of Science and Technology Wuhan 430074 China

License assisted access(LAA) was proposed as a solution to the challenge of satisfying high throughput requirement in cellular network with limited licensed band. LAA uses long term evolution(LTE) carrier aggregation technique to combine licensed and unlicensed bands, specifically 5 GHz Wi Fi band, in order to achieve high data rates. However, LAA has several critical concerns for services provision on 5 GHz unlicensed band. In this article, an overview of the techniques concerning the coexistence of LTE and Wi Fi on the same unlicensed band is presented. We first present several general approaches including power control of LTE evolved Node B(e NB), carrier selection, LTE duty cycling, self clear to send(CTS) and request to send/CTS(RTS/CTS), and listen before talk(LBT). Then, we focus on LBT techniques for LAA-Wi Fi coexistence and discuss how LBT based coexistence solutions can dynamically respond to the variations in network load and ensure fair coexistence in a distributed manner. Based on the LBT mechanism, we also present a fairness-aware LAA-WiF i coexisting scheme with TXOP(transmitted in a single transmission opportunity) backoff for LAA e NB. Finally, the performances of various LBT solutions for LAA-Wi Fi coexistence are evaluated using Markov chain analytical model.

关键词： WiFi unlicensed band LTE coexistence license assisted access listen before talk

基于Adams宏命令的链传动弹箱动力学模型快速建模与分析

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兵器装备工程学报 2024年第S1期45卷 139-143,153页

作者：王蓉叶斐罗定长安望江工业集团公司重庆400023 中国人民解放军32382部队北京100072 南京理工大学机械工程学院南京210094

链传动弹箱因内部零部件数量多、接触关系复杂,一直是Adams动力学建模难点。通过研究Adams宏命令的语法结构并结合变量与循环对Adams进行二次开发,形成一套快速建模方法,在链条内、外链板上建立旋转铰的Marker点,建立某链传动弹箱的动... 详细信息

链传动弹箱因内部零部件数量多、接触关系复杂,一直是Adams动力学建模难点。通过研究Adams宏命令的语法结构并结合变量与循环对Adams进行二次开发,形成一套快速建模方法,在链条内、外链板上建立旋转铰的Marker点,建立某链传动弹箱的动力学模型;结果显示该快速建模方法建模效率高,能够反映弹箱实际运动规律,具备推广应用价值。

关键词：兵器科学与技术 Adams 宏链传动弹箱动力学建模

Analysis of conductance and interfacial polarisation behaviours of silicone rubber based on frequency domain spectroscopy

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High Voltage 2024年第1期9卷 56-65页

作者： Hao Hu Zhidong Jia Xilin Wang Ruiyang Guan Weinan Fan Simin luo Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhenChina Guangzhou Power Supply China Southern Power Grid Company Ltd.GuangzhouChina

Silicone rubber(SR)is widely used for cable insulation and operates in multi-stress coupling *** dielectric properties and ageing performance are the essential factors affecting cable *** this study,the frequency domain spectroscopy of unaged SR and SR aged under various conditions is *** dielectric responses before and after ageing are analysed in depth by the conjoint analysis via multiple complex planes(permittivity,conductivity,and modulus).Typical conductivity and interfacial polarisation properties,as well as property changes resulting from thermal and tensile ageing,are *** results show that tensile ageing promotes conductance and interfacial polarisation,while thermal ageing shows the opposite *** on the multi-core model and charge carrier hopping transport model,thermal and tensile ageing mechanisms on the conductance and interfacial polarisation behaviours of SR are *** behaviours exhibit positively correlated changing characteristics,suggesting that the two behaviours may originate from a common *** carrier transport process,promoted by the tensile effect and slightly suppressed by the thermal effect,is the primary factor and considered an important indicator to evaluate the dielectric properties of SR insulation.

关键词： interfacial rubber insulation

Preparation and Characterization of Mesophase Pitch via Co-Carbonization of Waste Polyethylene/Petroleum Pitch

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Journal of Materials Science & Technology 2015年第8期31卷 857-863页

作者： Youliang Cheng Lu Yang Tao luo Changqing Fang Jian Su Jian Hui School of Printing and Packaging Engineering Xi'an University of Technology Petrochina Liaoyang Petrochemical Company China National Petroleum Corporation

The low-cost petroleum pitch and waste polyethylene （WPE） were used as raw materials to prepare the mesophase pitch by co-carbonization method and the forming mechanization of mesophase pitch was also investigated. Polarized microscopy, softening point, Fourier transform infrared spectroscopy （FTIR） and thermogravimetric analysis （TGA） were used to characterize and analyze the properties and struc- ture of the mesophase pitch. The results showed that the carbonization yield of the modified pitch was high when 1-2 wt% WPE was added and the property of mesophase pitch （MP1-450-4 and MP2-450-4） prepared by thermal polymerization was excellent. Moreover, when the treatment temperature was above 420 ~C, the mesophase development of the modified pitch may be entire and 100% streamline texture mesophase can form. During the co-carbonization of WPEJpetroleum pitch, a large number of naphthenic structures and methylene bridges may be generated, which can improve the properties of the obtained mesophase pitch.

关键词： Polarized light microscopy Microstructure Property Thermogravimetric analysis (TGA) Formation mechanism

HT-7装置实验数据分析与可视化集成软件开发

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核聚变与等离子体物理 2006年第1期26卷 47-53页

作者：瞿连政罗家融朱琳喻文勇中科院等离子体物理研究所华东理工大学上海200237 中国资源卫星应用中心北京100086

在HT-7装置实验数据分析与可视化集成软件GT-7开发中,使用了面向系统并且支持系统开发全部过程的建模工具UML,完成了软件的建模、设计与实现,介绍了该软件用到的关键技术与实现方法。实验表明,该软件应用性强,操作灵活,用户只需操作鼠... 详细信息

在HT-7装置实验数据分析与可视化集成软件GT-7开发中,使用了面向系统并且支持系统开发全部过程的建模工具UML,完成了软件的建模、设计与实现,介绍了该软件用到的关键技术与实现方法。实验表明,该软件应用性强,操作灵活,用户只需操作鼠标就可以完成信号的处理、分析、对比以及二维、三维显示,并能以交互式方式实现二维图形的任意轴缩放,三维图形的旋转、平移与缩放。

关键词：数据分析数据显示 UML HT-7装置

Determinants of lexical access in pure-anomic recovery:a longitudinal study

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第5期10卷 341-347页

作者： Xiao ZHOU Hui LIANG Ming-wei XU Ben-yan luo Neuropsychology Laboratory the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Many studies involving lexical access in picture-naming tasks have been undertaken at a point in time,mainly focusing on age of acquisition(AoA).To identify the real determinates of lexical access in recovery and their traces in the brain,we carried out a longitudinal study on a Chinese pure anomic patient using multiple logistic regression *** found that AoA played an important role in early recovery but not in total recovery,whereas familiarity was significant in the whole *** a new dynamic point of view,our results indicate that AoA and familiarity are the main determinants of lexical access in anomia *** suggest that the changing effects of AoA during recovery may be related to the pathologic process;AoA and familiarity should be taken into account in constructing materials to assess and treat anomic patients.

关键词： Object naming Age of acquisition Anomia Therapy

Pixel super-resolution using wavelength scanning

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Light(Science & Applications) 2015年第1期4卷 22-32页

作者： Wei luo Yibo Zhang Alborz Feizi Zoltan Gorocs Aydogan Ozcan Electrical Engineering Department University of CaliforniaLos AngelesCA 90095USA Bioengineering Department University of CaliforniaLos AngelesCA 90095USA California NanoSystems Institute(CNSI) University of CaliforniaLos AngelesCA 90095USA Department of Surgery David Geffen School of MedicineUniversity of CaliforniaLos AngelesCA 90095USA

Undersampling and pixelation affect a number of imaging systems, limiting the resolution of the acquired images, whichbecomes particularly significant for wide-field microscopy applications. Various super-resolution techniques have been implemented to mitigate this resolution loss by utilizing sub-pixel displacements in the imaging system, achieved, for example, byshifting the illumination source, the sensor array and/or the sample, followed by digital synthesis of a smaller effective pixel bymerging these sub-pixel-shifted low-resolution images. Herein, we introduce a new pixel super-resolution method that is basedon wavelength scanning and demonstrate that as an alternative to physical shifting/displacements, wavelength diversity can beused to boost the resolution of a wide-field imaging system and significantly increase its space-bandwidth product. We confirmedthe effectiveness of this new technique by improving the resolution of lens-free as well as lens-based microscopy systems anddeveloped an iterative algorithm to generate high-resolution reconstructions of a specimen using undersampled diffraction patterns recorded at a few wavelengths covering a narrow spectrum (10–30 nm). When combined with a synthetic-aperture-baseddiffraction imaging technique, this wavelength-scanning super-resolution approach can achieve a half-pitch resolution of250 nm, corresponding to a numerical aperture of ~ 1.0, across a large field of view (420 mm^(2)). We also demonstrated theeffectiveness of this approach by imaging various biological samples, including blood and Papanicolaou smears. Compared withdisplacement-based super-resolution techniques, wavelength scanning brings uniform resolution improvement in all directionsacross a sensor array and requires significantly fewer measurements. This technique would broadly benefit wide-field imagingapplications that demand larger space-bandwidth products.

关键词： holographic imaging on-chip microscopy pixel super-resolution wavelength scanning wide-field imaging