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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Wu, Pengfan Wang, Fayang Xu, Shiwei Liu, Tao Mu, Xiaojing Chongqing University Key Laboratory Of Optoelectronic Technology & Systems Ministry Of Education International R&d Center Of Micro-Nano Systems And New Materials Technology Chongqing China

ISBN: (纸本)9784886864352

A highly sensitive vibration sensor based on TENG (HSVS-TENG) with ultra-wide frequency response is presented. This study is the first to introduce a quasi-zero stiffness structure into the TENG to minimize the driving force by optimizing the magnetic induction intensity and the weight of the moving part. The results show that the HSVS-TENG can measure vibrations with frequencies ranging from 2.5 to 2600 Hz, with a sensitivity ranging from 0.32 to 134.9 V/g. Moreover, the sensor exhibits a good linear response versus the applied acceleration, and the linearity ranges from 0.08 to 2.81 V/g. © 2023 IEEJ.

关键词： Quasi-zero stiffness self-powered system triboelectric nanogenerator vibration sensor

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Collective Neighboring Potential Based Media Access Control Access Protocol for Flying Ad Hoc Network 24

Collective Neighboring Potential Based Media Access Control ...

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4th International Conference on Signal Processing and Communication technology, SPCT 2024

作者： Yu, Xiaoyi Liu, Yun Wang, Zikai Zhang, Haipeng Chen, Gaojie Xiao, Pei The Beijing R&D Center Academy for Network and Communications China Electronics Technology Group Corporation Hebei Shijiazhuang China The State Key Laboratory of ISN Xidian University Shaanxi Xi’an China

ISBN: (纸本)9798400710636

Nowadays, with the rapid development of UAV collaboration technology, the Flying ad hoc network (FANET) composed of multiple UAVs has received wide attention. In order to achieve a more flexible UAV networking architecture, the network size is getting larger and the number of UAVs is increasing. However, due to the high-speed movement of UAVs and the flexible and changeable architecture of FANET, the access collision of large-scale UAVs in networking has become an urgent problem to be solved. In this paper, we propose an access algorithm based on Collective Neighborhood Interference Potential (CNIP), aiming to achieve low access conflict rate and low access delay in large-scale UAV scenarios. Firstly, a scheme for calculating the CNIP is proposed for the distribution of nodes around a large-scale UAV node;secondly, we propose an access mechanism based on the historical access situation of the channel to provide access probability for the UAV node. Simulation results show that compared with traditional access algorithms, the CNIP-p-CSMA algorithm not only improves the average access success rate, but also achieves lower latency and higher access efficiency. © 2024 Copyright held by the owner/author(s).

关键词： Unmanned aerial vehicles (UAV)

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Novel polyimide binder for achieving high-rate capability and long-term cycling stability of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode via constructing polar and micro-branched crosslinking network structure

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Journal of Energy Chemistry 2023年第1期76卷 19-31,I0002页

作者： Yueming Xu Yali Wang Nanxi dong Chuanzhi Pu Bingxue Liu Guofeng Tian Shengli Qi dezhen Wu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China ENFI R&D Institute China ENFI EngineeringCorporationBeijing 100038China China Automotive Battery Research Institute Co. Ltd.Beijing 101407China

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)material,as the promising cathode candidate for next-generation highenergy lithium-ion batteries,has gained considerable attention for extremely high theoretical capacity and low ***,the intrinsic drawbacks of NCM811 such as unstable structure and inevitable interface side reaction result in severe capacity decay and thermal ***,a novel polyimide(denoted as PI-Om dT)constructed with the highly polar and micro-branched crosslinking network is reported as a binder material for NCM811 *** micro-branched crosslinking network is achieved by using 1,3,5-Tris(4-aminophenoxy)benzene(TAPOB)as a crosslinker via condensation reaction,which endows excellent mechanical properties and large free ***,the massive polar carboxyl(-COOH)groups provide strong adhesion sites to active NCM811 *** functions of PIOm dT binder collaboratively benefit to forming the mechanically robust and homogeneous coating layer with rapid Li+diffusion on the surface of NCM811,significantly stabilizing the cathode structure,suppressing the detrimental interface side reaction and guaranteeing the shorter ion-diffusion and electron-transfer paths,consequently enhancing electrochemical *** compared to the NCM811 with PVdF binder,the NCM811 using PI-Om dT binder delivers a superior high-rate capacity(121.07 vs.145.38 m Ah g^(-1))at 5 C rate and maintains a higher capacity retention(80.38%vs.91.6%)after100 cycles at 2.5–4.3 ***,at the high-voltage conditions up to 4.5 and 4.7 V,the NCM811 with PI-Om dT binder still maintains the remarkable capacity retention of 88.86%and 72.5%after 100 cycles,respectively,paving the way for addressing the high-voltage operating stability of the NCM811 ***,the full-charged NCM811 cathode with PI-Om dT binder exhibits a significantly enhanced thermal stability,improving the safety performance of *** work opens a new avenue for developing

关键词： Polyimide Binder Micro-branched crosslinking network NCM811 cathode Lithium-ion battery

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Impact of Interfacial Layer on the Optoelectronic Performance of MoTe2/Ge Heterojunction 17

Impact of Interfacial Layer on the Optoelectronic Performanc...

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17th IEEE International Conference on Solid-State and Integrated Circuit technology, ICSICT 2024

作者： Lei, Wenyu Wen, Xiaokun di, Boyuan Xu, Xinyue Chang, Haixin Zhang, Wenfeng School of Materials Science and Engineering Huazhong University of Science and Technology Key Laboratory of Material Processing and Die & Mould Technology Wuhan430074 China Shenzhen R&D Center Huazhong University of Science and Technology Shenzhen518000 China

ISBN: (纸本)9798350361834

In this paper, three types of ultra-thin interfacial oxide layers including GeO2, Al2O3, and SiO2, are designed to inserted into the interface of MoTe2/Ge heterojunction to investigate its impact on the photoelectric performance. The device with GeO2 interfacial layer exhibits the maximum responsivity and detectivity as well as the relatively large rectification ratio, reaching values of 1.38 A/W, 1.32× 10 13 Jones, and 140, respectively. For the device with Al2O3 interfacial layer, the maximum rectification ratio and the relatively high detectivity are achieved, reaching values of 807 and 1.56× 10 11 Jones, respectively. While for the MoTe2/Ge heterojunction with SiO2 interfacial layer, which shows an ideality factor of 2.14 and the lowest rectification ratio together with the detectivity. These results indicate that both the interface quality and bandgap of ultrathin interfacial layer would be crucial for the photoelectronic performance of MoTe2/Ge heterojunction. © 2024 IEEE.

关键词： Tellurium compounds

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discovering latent themes in aviation safety reports using text mining and network analytics

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International Journal of Transportation Science and technology 2024年第4期16卷 292-316页

作者： Yingying Xing Yutong Wu Shiwen Zhang Ling Wang Haoyuan Cui Bo Jia Hongwei Wang The Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai201804China Institute of Safety Operation Research Institute China Eastern Technology Application R&D CenterShanghai 201707China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Aviation accidents,referring to unexpected and undesirable events involving aircraft,often cause great damage to property and human *** from historical accidents is pivotal for improving safety in ***,aviation accidents are typically documented and stored as unstructured or semi-structured free-text,rendering the ability to analyze such data a difficult *** study presents a novel framework that combines text mining and network analytics techniques to provide the ability to analyze aviation accident reports *** framework comprises a four-step modelling approach to:(1)the transformation of unstructured aviation safety report texts into structured numeric matrices using the TF-IdF matrix;(2)the identification of aviation accident topics using a structural topic model(STM);(3)the production of a word co-occurrence network(WCN)to determine the interrelations between aviation safety risk factors;and(4)quantitative analysis by technology of keywords to pinpoint key causal factors in aviation safety *** proposed framework is validated by analyzing aviation accident reports collected by the National Transportation Safety Board(NTSB).The results indicate that STM provides a more granular partitioning of topics and better distinguishes between similar events compared to traditional latent dirichlet allocation(LdA).Among the identified topics,“Fuel and Power”and“En-route Phase”have the highest occurrence rate according to ***,“Aircraft Crash”is the most prevalent topic in aviation accidents that resulted in fatal injuries,whereas the“Landing phase”is the most prevalent topic in nonfatal injuries on *** on the WCN,three centrality measures highlight“inspection of equipment”and“take off”as the most important risk factors in aviation *** proposed framework provides a comprehensive solution for in-depth analysis of aviation safety reports,offering decision support for aviation safety management and ac

关键词： Aviation safety Aviation accident report Text mining Topic modeling Network analysis

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Numerical simulation of the water landing process of a light civil helicopter in level 5 sea conditions 2

Numerical simulation of the water landing process of a light...

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2023 2nd International Conference on Aerospace and Control Engineering, ICoACE 2023

作者： Zhu, Yuanchun Sun, Libing Emergency Rescue Technology R&D Department Hangyu Life-Saving Equipment Co. Ltd. Xiangyang441100 China Key Laboratory of Aviation Science and Technology for Aviation Protection and Lifesaving Technology Xiangyang441100 China

A helicopter emergency flotation system can provide flotation capability after the helicopter accidentally falls into the water. To solve the problem of attitude change of a helicopter after landing in water, a numerical simulation was carried out on a light civil helicopter with a weight of 3.5 t. It was simulated in level 5 sea conditions, the traveling speed was 15.4 m/s, and the height of the lowest point of the hydrostatic helicopter from the water surface was 250-260 mm, with or without lift, with or without floats. Landing on the water can be done with either basic or elliptical floats and in three different postures. The simulation results show that equipping a helicopter with pontoons can significantly improve its overturning resistance and flotation capabilities, but the impact on a helicopter equipped with pontoons will increase. Landing a helicopter in the water at a certain elevation angle is beneficial to the stability of the helicopter. A helicopter with a basic pontoon is more stable when it lands in the water. The performance is higher than that of the ellipsoidal pontoon, but the pitch stability of the basic pontoon is lower than that of the ellipsoidal pontoon. © Published under licence by IOP Publishing Ltd.

关键词： Helicopters

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Waste to Energy Treatment for India Using CrITIC-WASPAS Method under Interval-Valued Pythagorean Neutrosophic Fuzzy Set

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Neutrosophic Sets and Systems 2023年 61卷 493-506页

作者： devi, r. Narmada Sowmiya, S. Sundareswaran, r. Broumi, Said Department of Mathematics Vel Tech Rangarajan Dr.Sanguthala R&D Institute of Science and Technology Tamil Nadu Chennai India Department of Mathematics Vel Tech Rangarajan Dr.Sanguthala R&D Institute of Science and Technology Tamil Nadu Chennai India Department of Mathematics Sri Sivasubramaniya Nadar College of Engineering Tamil Nadu Chennai India Laboratory of Information Processing Faculty of Science Ben MaAZSik University of Hassan II Casablanca Morocco

Municipal solid waste management (MSWM) has emerged as a major issue in India due to the massive amounts of waste generated on a daily basis. Governments are focusing on establishing a proper waste management system, including a timeline for the installation of waste processing and disposal facilities to reduce waste. For this problem, waste to energy (WtE) technologies have been identified because of their ability to convert waste into green energy while minimizing associated issues. This research investigates the different kinds of WtE treatments based on various factors, namely eco-friendly, budget friendly, technical, and social aspects. The findings of this study revealed which WtE treatments are best suited for waste management systems that convert green energy. In this paper, we propose the best WtE treatment for India using the interval-valued pythagorean neutrosophic fuzzy set (PNFS). We employ the WASPAS-CrITIC method in the interval-valued pythagorean neutrosophic fuzzy environment for this WtE treatment problem. Finally, a numerical example and a comparison are provided to illustrate the reliability and efficiency of the proposed technique. © (2023), (University of New Mexico). All rights reserved.

关键词： Fuzzy sets

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Prokaryotic diversity and community composition in the surface sediments of the Changjiang river Estuary in summer

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Acta Oceanologica Sinica 2023年第9期42卷 113-124页

作者： Changfeng Qu Xixi Wang Liping Zhang Huamao Yuan Xuegang Li Ning Li Fushan Chen Jinlai Miao Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China Marine Natural Products R&D Laboratory Qingdao Key LaboratoryQingdao 266061China

Microorganisms are fundamental for the functioning of marine ecosystems and are involved in the decomposition of organic matter, transformation of nutrients and circulation of biologically-important chemicals. Based on the complexity of the natural geographic characteristics of the Changjiang river Estuary, the geographic distribution of sedimentary microorganisms and the causes of this distribution are largely unexplored. In this work, the surface sediment samples from the adjacent sea area of the Changjiang river Estuary were collected. Their prokaryotic diversity was examined by high-throughput sequencing technology, and the environmental factors of the bacterial community were investigated. The results indicated that the distribution of prokaryotic communities in the sediments of the study areas showed obvious spatial heterogeneity. The sampling sequences divided the sample regions into three distinct clusters. Each geographic region had a unique community structure, although Proteobacteria, Bacteroidota, desulfobacterota, Acidobacteriota, and Actinobacteriota all existed in these three branches. Canonical correspondence analysis demonstrated that prokaryotic diversity and community distribution were significantly correlated with the geographic location of sediment, seawater depth, and in particular, nutrient content(e.g., total phosphorus, total organic carbon and dissolved oxygen). Moreover, it was found for the first time that the metal ions obviously affected the composition and distribution of the prokaryotic community in this area. In general, this work provides new insights into the structural characteristics and driving factors of prokaryotic communities under the background of the ever-changing Changjiang river Estuary.

关键词： prokaryotic diversity 16S rrNA gene geophysicochemical factors high-throughput sequencing(HTS) Changjiang river Estuary

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Contrastive Graph representations for Logical Formulas Embedding (Extended Abstract) 40

Contrastive Graph Representations for Logical Formulas Embed...

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40th IEEE International Conference on data Engineering, ICdE 2024

作者： Lin, Qika Liu, Jun Zhang, Lingling Pan, Yudai Hu, Xin Xu, Fangzhi Zeng, Hongwei School of Computer Science and Technology Xi'An Jiaotong University China Xi'An Jiaotong University Shaanxi Province Key Laboratory of Satellite and Terrestrial Network Tech. R&D China

ISBN: (纸本)9798350317152

Embedding symbolic logical formulas into a low-dimensional continuous space provides an effective way for the Neural-Symbolic system. However, current studies are all constrained by the syntactic structure modeling and fail to preserve intrinsic semantics. To this end, we propose a novel model of Contrastive Graph representations (ConGr) for logical formulas embedding. Firstly, it introduces a densely connected graph convolutional network (GCN) with an attention mechanism to process syntax parsing graphs of formulas. Secondly, the contrastive instances for each anchor formula are generated by the transformation under the guidance of logical properties. Two types of contrast, global-local and global-global, are carried out to refine formula embeddings with semantic information. Extensive experiments demonstrate that ConGr obtains superior performance against state-of-the-art baselines. © 2024 IEEE.

关键词： Embeddings

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Using multiple regression analysis to predict directionally solidified TiAl mechanical property

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Journal of Materials Science & technology 2022年第9期104卷 285-291页

作者： Seungmi Kwak Jaehwang Kim Hongsheng ding Xuesong Xu ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Carbon Materials Application R&D Group Korea Institute of Industrial TechnologyJeonju 54853 Republic of Korea

The mechanical properties of TiAl alloy prepared by directional solidification were predicted through a machine learning algorithm *** composition,input power,and pulling speed were designated as input variables as representative factors influencing mechanical properties,and multiple linear regression analysis was conducted by collecting data obtained from the *** this study,the r^(2)value of the tensile strength prediction result was 0.7159,elongation was 0.8459,nanoindentation hardness was 0.7573,and interlamellar spacing was *** the r^(2)value of the elongation obtained through the analysis was higher than the r^(2)value of the tensile strength,it was confirmed that the elongation had a closer relationship with the input variables(composition,input power,pulling speed)than the tensile *** adding the elongation to the tensile strength as an input variable,it was observed that the r^(2)value was further *** tensile test prediction results were divided into four groups:The group with the lowest residual value(predicted value-actual value)was designated as group A,and the group with the largest residual value was designated as group *** comparing the values of group A and group d,more overpredictions occurred in group A,while more under predictions occurred in group *** the residuals and r^(2)values,the cause of the well-prediction was studied,and through this,the relationship between the mechanical properties and the microstructure was quantitatively investigated.

关键词： directionally solidified TiAl alloy Microstructure control Tensile strength Interlamellar space Prediction Multiple linear regression

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