检索结果-南通市图书馆

Thermal runaway evolution of a 280 Ah lithium-ion battery with LiFePO_(4) as the cathode for different heat transfer modes constructed by mechanical abuse

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 2024年第6期93卷 32-45,I0002页

作者： Zhixiang Cheng chengdong wang Wenxin Mei Peng Qin Junyuan Li Qingsong wang State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina

Lithium iron phosphate batteries have been increasingly utilized in recent years because their higher safety performance can improve the increasing trend of recurring thermal runaway ***,the safety performance and mechanism of high-capacity lithium iron phosphate batteries under internal short-circuit challenges remain to be *** work analyzes the thermal runaway evolution of high-capacity LiFePO_(4) batteries under different internal heat transfer modes,which are controlled by different penetration *** penetration cases involving complete penetration and incomplete penetration were detected during the test,and two modes were performed incorporating nails that either remained or were removed after penetration to comprehensively reveal the thermal runaway mechanism.A theoretical model of microcircuits and internal heat conduction is also *** results indicated three thermal runaway evolution processes for high-capacity batteries,which corresponded to the experimental results of thermal equilibrium,single thermal runaway,and two thermal runaway *** difference in heat distribution in the three phenomena is determined based on the microstructure and material structure near the *** controlling the heat dissipation conditions,the time interval between two thermal runaway events can be delayed from 558 to 1417 s,accompanied by a decrease in the concentration of in-situ gas production during the second thermal runaway event.

关键词： Lithium-ion battery safety Micro short-circuit cell Heat transfer modes Internal short circuit Nail-penetration test

YOLO-O2E:A Variant YOLO Model for Anomalous Rail Fastening Detection

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第7期80卷 1143-1161页

作者： Zhuhong Chu Jianxun Zhang chengdong wang Changhui Yang Department of Computer Science and Engineering Chongqing University of TechnologyChongqing400054China Institute of Flexible Electronics(Future Technologies) Xiamen UniversityXiamen361000China College of Mechanical Engineering Chongqing University of TechnologyChongqing400054China

Rail fasteners are a crucial component of the railway transportation safety *** fasteners,distinguished by their high length-to-width ratio,frequently encounter elevated failure rates,necessitating manual inspection and *** inspection not only consumes time but also poses the risk of potential *** the advancement of deep learning technology in rail fasteners,challenges such as the complex background of rail fasteners and the similarity in their states are *** have proposed an efficient and high-precision rail fastener detection algorithm,named YOLO-O2E(you only look once-O2E).Firstly,we propose the EFOV(Enhanced Field of View)structure,aiming to adjust the effective receptive field size of convolutional kernels to enhance insensitivity to small spatial ***,The OD_MP(ODConv and MP_2)and EMA(EfficientMulti-Scale Attention)modules mentioned in the algorithm can acquire a wider spectrum of contextual information,enhancing the model’s ability to recognize and locate ***,we collected and prepared the GKA dataset,sourced from real train *** testing on the GKA dataset and the publicly available NUE-DET dataset,our method outperforms general-purpose object detection *** the GKA dataset,our model achieved a mAP 0.5 value of 97.6%and a mAP 0.5:0.95 value of 83.9%,demonstrating excellent inference ***-O2E is an algorithm for detecting anomalies in railway fasteners that is applicable in practical industrial settings,addressing the industry gap in rail fastener detection.

关键词： Rail fastening detection deep learning anomalous rail fastening variant YOLO feature reinforcement

Numerical Study of Effect of Compressor Swirling Flow on Combustor Design in a MTE

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 Thermal Science 2017年第4期26卷 349-354页

作者： MU Yong wang chengdong LIU Cunxi LIU Fuqiang HU Chunyan XU Gang ZHU Junqiang Key Laboratory of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing 100190 China Institute of Qingdao Light-duty Gas-turbine Qingdao 266000China

An effect of the swirling flow on the combustion performance is studied by the computational fluid dynamics(CFD) in a micro-gas turbine with a centrifugal compressor, dump diffuser and forward-flow combustor. The distributions of air mass and the Temperature Pattern Factor(as: Overall Temperature Distribution Factor-OTDF) in outlet are investigated with two different swirling angles of compressed air as 0° and 15° in three combustors. The results show that the influences of swirling flow on the air distribution and OTDF cannot be neglected. Compared with no-swirling flow, the air through outer liner is more, and the air through the inner liner is less, and the pressure loss is bigger under the swirling condition in the same combustor. The Temperature Pattern Factor changes under the different swirling conditions.

关键词： Combustor CFD Compressor exit flow angle Micro Turbojet Engine (MTE)

A fast and effective method to perform paternity testing for Wolong giant pandas

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第24期56卷 2559-2564页

作者： LI DeSheng CUI HengMin wang chengdong LING ShanShan HUANG Zhi ZHANG HeMin China Research and Conservation Center for the Giant Panda Ya'an 625000 China Medical College of Animal Sichuan Agricultural University Ya'an 625000 China Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education and State Conservation Center for Gene Resources of Endangered Wildlife Hangzhou 310058 China

Captive populations provide a precious genetic resource for endangered animals and a source of individuals for reintroduction to depleted habitats. Therefore, accuracy in determining paternity is of vital importance for managing captive populations and in selecting representative individuals of known genetic characteristics for release. In this study, we established a fast and effective method to conduct paternity testing for captive giant pandas in the Wolong population. This technique uses two highly polymor phic microsatellites initially, subsequent use of five less polymorphic markers and then paternity exclusion testing carried out using the giant panda paternity exclusion program we have developed. Our results revealed that (1) both sets of markers success- fully identified the real fathers in 25 cases of paternity testing and (2) the success rate of paternity exclusion varied with the degree of polymorphism of the markers used. Subsequently, we conducted correlation analysis between the success rates of paterni- ty identification with these markers, parameters of genetic diversity and tests of neutrality. We found that the paternity exclusion power of microsatellites was significantly correlated with the number of alleles (Na), expected heterozygosity (HE) and observed homozygosity statistic (FO) (all P < 0.05). From this, we developed a new variable, Na?HE/FO, showing a highly significant positive correlation with the resolution power of microsatellites (P = 0.001). Moreover, the first two highly polymorphic loci gave a 100% success rate of excluding non-paternal males because they yielded higher values of Na?HE/FO than the other five less pol- ymorphic markers. Thus, the Na?HE/FO parameter appears suitable to serve as a criterion for selecting microsatellite markers, which could be used for high-resolution molecular techniques of paternity determination among a range of captive animals besides giant pandas.

关键词：圈养大熊猫亲子鉴定卧龙多态性位点分子生物学技术多态标记圈养种群遗传资源

Interfacial chemistry ofγ-glutamic acid-derived block polymer binder directing the interfacial compatibility of high voltage LiNi0.5Mn1.5O4 electrode

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2021年第1期64卷 92-100页

作者： Yue Ma chengdong wang Jun Ma Gaojie Xu Zheng Chen Xiaofan Du Shu Zhang Xinhong Zhou Guanglei Cui Liquan Chen Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China College of Chemistry and Molecular Engineering Qingdao University of Science&TechnologyQingdao 266042China Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

LiNi0.5Mn1.5O4(LNMO)spinel is one of the most promising high voltage cathode candidates for lithium ion batteries(LIBs).However,owing to the instability for organic electrolytes at 5V high voltage,it exhibits continuous oxidation,leading to the formation of unstable interface and the notorious dissolution of transition metal,which prevents the successful commercialization of ***,on the basis of energy level simulation,we present a high voltage resistant binder shielding strategy to address the challenging interfacial issue of *** strategy is to design a novel poly(γ-glutamic acid)-c-1H,1H,9H,9H-perfluoro-1,9-nonanediol(γ-PGFO)binder with superior transition metal chelating effect and well-matched energy level to guarantee fantastic interfacial *** is demonstrated that the dissolution of transition metal is significantly suppressed in the presence ofγ-PGFO binder,which excels in the *** is also noted that intramolecular hydrogen binding of the well-designed binder can generate powerful facial-contact binding,which is significant for a promising *** encapsulating this binder inside the cathode matrix,the Li Ni0.5Mn1.5O4electrode exhibits a capacity of 105.8 m Ah g^(-1)after 500cycles at 1 C with a capacity retention of 88.2%,which is significantly superior to that of polyvinylidene fluoride(PVDF)/Li Ni0.5Mn1.5O4electrode(a capacity of 82.9 m Ah g^(-1)and a capacity retention of 63.4%).The overall Coulombic efficiency ofγ-PGFO/Li Ni0.5Mn1.5O4electrode is prominently improved to be 99.1%,compared with 95.5%of PVDF *** presented results demonstrate a promising strategy of amino acid-based binder with strong transition metal chelating capability for boosting the rapid development of high voltage lithium ion battery.

关键词： LiNi0.5Mn1.5O4 cathode amino acid binder high voltage interfacial regulation

On Practice and Exploration of College English Multimedia Network Teaching in China

在线全文

学校读者我要写书评

暂无评论

International English Education Research 2014年第7期 7-9页

作者： wang chengdong School of Foreign Languages Dalian Jiaotong University Dalian Liaoning

With the development of the times, modem education technology constantly emerges, and modern college English classroom begins to tend to use multimedia network for teaching. One is that multimedia network teaching can enrich English teaching content. Two is that multimedia network teaching can make teaching process become full ofvigour, highlighting the dominant position of students in the classroom. Three, multimedia network teaching is conducive to improving the comprehensive quality of English teachers. In view of this, university English teaching should positively introduce multimedia network technology in teaching process, in order to promote English teaching quality to obtain great improvement.

关键词： college English teaching multimedia network strategy

Taking Comprehensive Practice Activities as the Carrier to Improve College English Teaching Efficiency

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 Zhouyi Research 2014年第5期 3-5页

作者： wang chengdong School of Foreign Languages Dalian Jiaotong University Dalian Liaoning

On Practice and Exploration of College English Multimedia Network Teaching in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International English Education Research 2014年第11期 32-34页

作者： wang chengdong School of Foreign Languages Dalian Jiaotong University Dalian Liaoning

With the development of the times, modem education technology constantly emerges, and modern college English classroom begins to tend to use multimedia network for teaching. One is that multimedia network teaching can enrich English teaching content. Two is that multimedia network teaching can make teaching process become full of vigour, highlighting the dominant position of students in the classroom. Three, multimedia network teaching is conducive to improving the comprehensive quality of English teachers. In view of this, university English teaching should positively introduce multimedia network technology in teaching process, in order to promote English teaching quality to obtain great improvement.

关键词： college English teaching multimedia network strategy

Taking Comprehensive Practice Activities as the Carrier to Improve College English Teaching Efficiency

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 Zhouyi Research 2014年第6期 35-37页

作者： wang chengdong School of Foreign Languages Dalian Jiaotong University Dalian Liaoning