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Ultrafast Response and Threshold Adjustable Intelligent Thermoelectric Systems for Next‑Generation Self‑Powered Remote IoT Fire Warning

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Nano-Micro Letters 2024年第11期16卷 413-428页

作者： Zhaofu Ding Gang Li yejun Wang Chunyu Du Zhenqiang Ye Lirong Liang Long‑Cheng Tang Guangming Chen College of Materials Science and Engineering&College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518055People’s Republic of China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material Technology of MoEHangzhou Normal UniversityHangzhou 311121People’s Republic of China

Fire warning is vital to human life,economy and ***,the development of effective warning systems faces great challenges of fast response,adjustable threshold and remote ***,we propose an intelligent self-powered remote IoT fire warning system,by employing single-walled carbon nanotube/titanium carbide thermoelectric composite *** flexible films,prepared by a convenient solution mixing,display p-type characteristic with excellent high-temperature stability,flame retardancy and TE(power factor of 239.7±1..8μW m^(-1. K^(-2))*** comprehensive morphology and structural analyses shed light on the underlying *** the assembled TE devices(TEDs)exhibit fast fire warning with adjustable warning threshold voltages(1.1. mV).Excitingly,an ultrafast fire warning response time of~0.1.s at 1.mV threshold voltage is achieved,rivaling many state-of-the-art ***,TE fire warning systems reveal outstanding stability after 50 repeated cycles and desired durability even undergoing 1.0 days of air ***,a TED-based wireless intelligent fire warning system has been developed by coupling an amplifier,analogto-digital converter and Bluetooth *** combining TE characteristics,high-temperature stability and flame retardancy with wireless IoT signal transmission,TE-based hybrid system developed here is promising for next-generation self-powered remote IoT fire warning applications.

关键词： Thermoelectric Self-powered IoT fire warning Ultrafast response Threshold adjustable

In-situ interfacial passivation and self-adaptability synergistically stabilizing all-solid-state lithium metal batteries

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Journal of Energy Chemistry 2024年第1期88卷 282-292,I0007页

作者： Huanhui Chen Xing Cao Moujie Huang Xiangzhong Ren Yubin Zhao Liang Yu Ya Liu Liubiao Zhong yejun Qiu Shenzhen Engineering Lab of Flexible Transparent Conductive Films School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina School of Resource and Environmental Sciences Wuhan UniversityWuhan 430072HubeiChina

The function of solid electrolytes and the composition of solid electrolyte interphase(SEI)are highly significant for inhibiting the growth of Li ***,we report an in-situ interfacial passivation combined with self-adaptability strategy to reinforce Li_(0.33)La_(0.557)TiO_(3)(LLTO)-based solid-state ***,a functional SEI enriched with LiF/Li_(3)PO_(4) is formed by in-situ electrochemical conversion,which is greatly beneficial to improving interface compatibility and enhancing ion *** the polarized dielectric BaTiO_(3)-polyamic acid(BTO-PAA,BP)film greatly improves the Li-ion transport kinetics and homogenizes the Li *** expected,the resulting electrolyte offers considerable ionic conductivity at room temperature(4.3 x 1.~(-4)S cm^(-1.)and appreciable electrochemical decomposition voltage(5.23 V)after electrochemical *** Li-LiFePO_(4) batteries,it shows a high specific capacity of 1.3 mA h g^(-1.at 0.2C after 1.0 cycles and a long-term durability of 1.5 mA h g^(-1.at 1.0 C after 800 ***,a stable Li plating/stripping can be achieved for more than 900 h at 0.5 mA cm^(-2).The stabilization mechanisms are elucidated by ex-situ XRD,ex-situ XPS,and ex-situ FTIR techniques,and the corresponding results reveal that the interfacial passivation combined with polarization effect is an effective strategy for improving the electrochemical *** present study provides a deeper insight into the dynamic adjustment of electrode-electrolyte interfacial for solid-state lithium batteries.

关键词： Solid-state lithium batteries Composite solid electrolyte In-situ polymerization Interfacial passivation layer Self-adaptability

Design and grindability assessment with cup shaped electroplated CBN wheel grinding turbine disc slots of powder metallurgy superalloy FGH96

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Chinese Journal of Aeronautics 2024年第9期37卷 521-534页

作者： Benkai LI Wenfeng DING yejun ZHU Changhe LI Yanbin ZHANG Min YANG Xiao MA Mingzheng LIU Xin CUI School of Mechanical Engineering Qingdao University of TechnologyQingdao 266520China National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Engineering Nanjing Agricultural UniversityNanjing 210031China

The machining surface integrity of aero-engine turbine disc slots has a significant impact on their fatigue life and service performance,and achieving efficiency and high-precision machining is still a great *** high machining requirements of future aeroengine turbine disc slots will be difficult to satisfy using the broaching *** addition,existing methods of slot machin-ing face difficulties in ensuring surface *** study explored a cup shaped electroplated Cubic Boron Nitride(CBN)abrasive wheel for profile grinding the turbine disc slots of FGH96 powder metallurgy *** matrix structure of the cup shaped abrasive wheel was designed and verified.A profile grinding experiment was conducted for fir-tree slots on a five-axis machining *** accuracy and the surface integrity were *** show that the key dimension detection results of the slots were within the allowable tolerance ***,an average sur-face roughness Ra of 0.55μm was achieved,the residual stress was compressive,the plastic defor-mation layer thickness was less than 5μm,and the hardening layer thickness was less than 20μ*** research findings provide a new approach to machining the slots of aviation engine turbine discs and guidance for the high-quality processing of complex components.

关键词： Profile grinding Surface integrity Cup shaped CBN abrasive wheel Turbine disc slots FGH96

Mode switching torque distribution strategy of timely four-wheel driven high-gap plant protection machine

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 176-184页

作者： Haijun Zhang Mingwei Guan Guojun Ji Ghulam Hussain Maohua Xiao yejun Zhu College of Engineering Nanjing Agricultural UniversityNanjing 210031China Essen Agricultural Machinery Changzhou Co. Ltd.Changzhou 213000China Faculty of Mechanical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences&TechnologyTopi 23460Pakistan

The high-gap plant protection machine is taken in this paper as the research object to ensure the good driving power and safety of the high-gap plant protection machine,and the control strategy of inter-shaft torque distribution is established under different working conditions to improve vehicle power and lateral *** anticipated demand torque is initially determined based on the structural characteristics and operational principles of the plant protection ***,a hierarchical control framework is devised by incorporating a formulated switching control ***,a simulation model for torque distribution control strategy between shafts is developed on the Matlab/Simulink platform,followed by simulation and experimental *** results are presented as follows:the inter-shaft torque distribution strategy established in this paper increases the average longitudinal acceleration by 0.1. m/s^(2) and 0.1. m/s^(2) under the control of low and high to low adhesion road surfaces,*** the control of the single-line shifting condition,the yaw velocity can successfully follow the expected value with a maximum value of 0.61.rad/*** side deflection angle of the center of mass does not exceed 2.8°,which can follow the ideal trajectory and improve power and safety.

关键词： plant protection robot torque distribution mode switching

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无菌性骨折不愈合的治疗

中华骨科杂志 2024年第9期44卷 644-650页

作者：查晔军蒋协远首都医科大学附属北京积水潭医院创伤骨科、骨科冲击波诊疗中心北京100035

骨折不愈合指骨折在预期时间内未能愈合,且无新的干预下不可能愈合的情况。骨折不愈合可根据有无感染和骨折部位的生物活性进行分类。无菌性骨折不愈合主要分为萎缩性、营养不良性、肥大性骨折不愈合以及假性关节和骨缺损,不同类型的骨... 详细信息

骨折不愈合指骨折在预期时间内未能愈合,且无新的干预下不可能愈合的情况。骨折不愈合可根据有无感染和骨折部位的生物活性进行分类。无菌性骨折不愈合主要分为萎缩性、营养不良性、肥大性骨折不愈合以及假性关节和骨缺损,不同类型的骨折不愈合采用不同的治疗策略。治疗骨折不愈合的关键在于准确诊断、控制感染、矫正畸形,并根据患者的具体情况选择合适的治疗方法。软组织管理在骨折不愈合的治疗中也起着重要作用,有时需要进行软组织修复以提供良好的愈合环境。骨折不愈合的治疗方法分为非手术和手术治疗。非手术治疗的优势在于避免可能的手术并发症,可分为直接干预和间接干预。间接干预方式包括:戒烟、优化营养、纠正内分泌和代谢紊乱、消除或减少某些药物;直接干预措施包括:负重、外固定、电磁刺激、超声波刺激、冲击波治疗、甲状旁腺激素。在手术干预之前应先尝试保守治疗,保守治疗无效或需行积极干预时再考虑行手术治疗。手术治疗方案包括更换髓内钉、髓内钉动力化、钢板固定、环形外固定架、关节置换等,需根据软组织的完整性、骨质缺损程度和合并疾病进行选择。自体骨移植是治疗骨折不愈合的金标准,另外同种异体骨移植和其他骨移植替代品也是治疗不愈合的选择。最理想的治疗方法需同时考虑外科医生的经验和技能、治疗方法的相对风险和益处以及患者的耐受性。

关键词：骨折,不愈合体外冲击波疗法骨折固定术骨移植

Comprehensive study of protein phosphorylation， acetylation， ubiquitination and S-nitrosylation profiles in pre- and post-rigor meat

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Food Science and Human Wellness 2024年

作者： Chi Ren Yuqiang Bai yejun Zhang Chengli Hou Li Chen James D.Morton Xin Li Zhenyu Wang Dequan Zhang Institute of Food Science and Technology， Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-products Quality & Safety in Harvest， Storage， Transportation， Management and Control， Ministry of Agriculture and Rural Affairs Faculty of Agriculture and Life Sciences， Lincoln University Lincoln 7647， New Zealand

This study investigated the integrated atlas of protein phosphorylation， acetylation， ubiquitination and S-nitrosylation in pre-rigor (0.5 h) and post-rigor (5 d) lamb to interpret the roles of protein post-translational modifications (PTMs) during meat aging. The results showed that the most common PTMs in postmortem meat were phosphorylated proteins. PTMs regulation during the postmortem period altered proteins involved in metabolic pathways and muscle contraction. The phosphorylation and ubiquitination of proteins located in mitochondria and nuclear changed significantly between 0.5 h and 5 d postmortem. Gene set enrichment analysis (GSEA) revealed possible roles of total PTMs proteins， with a general downregulation of phosphorylation， acetylation and ubiquitination. There was a weak correlation in the lysine PTM of acetylation and ubiquitination at the same site in postmortem meat. Multiple PTMs of proteins in glycolysis， TCA cycle， muscle contraction and the calcium signaling pathway cooperatively regulate meat quality development from pre-rigor to post-rigor.

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Recent Advances in Spin-coating Precursor Mediated Chemical Vapor Deposition of Two-Dimensional Transition Metal Dichalcogenides

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Precision Chemistry 2024年第7期2卷 282-299页

作者： Dingyi Shen yejun Jin Zucheng Zhang Rong Song Miaomiao Liu Wei Li Xin Li Ruixia Wu Bo Li Jia Li Bei Zhao Xidong Duan Hunan Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan University410082 ChangshaChina Key Laboratory of Quantum Materials and Devices of Ministry of Education School of PhysicsSoutheast UniversityNanjing 211189China Key Laboratory of Two-Dimensional Materials State Key Laboratory for Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan University410082 ChangshaChina

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have garnered widespread interest in the scientific community and industry for their exceptional physical and chemistry properties,and great potential for applications in diverse fields including(opto)electronics,electrocatalysis,and energy *** vapor deposition(CVD)is one of the most compelling growth methods for the scalable growth of high-quality 2D ***,the conventional CVD process for synthesis of 2D TMDs still encounters significant challenges,primarily attributed to the high melting point of precursor powders,and achieving a uniform distribution of precursor atmosphere on the substrate to obtain controllable smaple domains is *** spin-coating precursor mediated chemical vapor deposition(SCVD)strategy provides refinement over traditional methods by eliminating the use of solid precursors and ensuring a more clean and uniform distribution of the growth material on the ***,the SCVD process allows fine-tuning of material thickness and purity by manipulating solution composition,concentration,and the spin coating *** Review presents a comprehensive summary of recent advances in controllable growth of 2D TMDs with a SCVD ***,a series of various liquid precursors,additives,source supply methods,and substrate engineering strategies for preparing atomically thin TMDs by SCVD are ***,2D TMDs heterostructures and novel doped TMDs fabricated through the SCVD method are ***,the current challenges and perspectives to synthesize 2D TMDs using SCVD are discussed.

关键词： Spin-coating Chemical vapor deposition Liquid precursor Substrate Two-dimensional materials Heterostructure Doping Film

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基于视觉伺服的水下机器人导引技术

兵器装备工程学报 2024年第5期45卷 215-221页

作者：寇邺郡李想珠海科技学院广东珠海519040

自主水下载具(AUV)需要通过停靠入站进行休眠、电池充电、传输数据等任务的需求。AUV的导引技术对延长AUV的工作时长、扩大作业范围有重要意义。在入站过程的最后阶段,AUV需要在容许范围内保持自身与对象物的相对位姿(包括位置和方向),... 详细信息

自主水下载具(AUV)需要通过停靠入站进行休眠、电池充电、传输数据等任务的需求。AUV的导引技术对延长AUV的工作时长、扩大作业范围有重要意义。在入站过程的最后阶段,AUV需要在容许范围内保持自身与对象物的相对位姿(包括位置和方向),进而完成对接。因此,确保传感器单元和控制系统在真实的水下环境中对各种干扰具有高度精确性和鲁棒性至关重要。针对此问题,提出了一种基于视觉伺服的AUV的导引技术。首先,该技术通过模型匹配认识法确定机器人与指定标的物(对象物)之间的相对位姿来确定自己的方位。其次,通过遗传算法(GA)以完成实时的位姿认识,抵消水流、图像采集干扰带来的视觉伺服干扰。采用此方法的水下机器人控制系统分别在与东京大学合作的模拟深海水下无光环境实验,以及真实海洋环境中完成了实验验证。实验结果证明,该系统具有对低照度、高浊度引起的图像劣化以及水流引起的控制干扰具备抗干扰性和鲁棒性。

关键词：视觉伺服水下视觉水下机器人水下对接系统双目视觉

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选择“爱”:技术、数字生命与人性的未来

传媒观察 2024年第4期484卷 71-76页

作者：翟业军浙江大学文学院浙江杭州310058

根植于人类求生意志的技术让人类存续下去并帮助人类对抗死亡。同时,技术,这一于人类而言并不切身的事物存在着反噬人类的威胁。回顾技术发展史,技术和人的关系经历了技术在人类自身之外、在自身之中到技术创造出数字生命的过程。数字... 详细信息

根植于人类求生意志的技术让人类存续下去并帮助人类对抗死亡。同时,技术,这一于人类而言并不切身的事物存在着反噬人类的威胁。回顾技术发展史,技术和人的关系经历了技术在人类自身之外、在自身之中到技术创造出数字生命的过程。数字生命是技术将人性净化到极度强悍、完美的产物,但它却可能带来“恶”与“毒”。面对数字系统越来越深重的威胁,人性的物质性和事件性成为牵制和对抗它的利器。所谓物质性,指人性的阴影和不可省略的生命过程。数字生命是技术对人性净化到极致、毫无杂质的无菌状态,而物质性则可以解除人性的无菌状态,让其回归本真。所谓事件性,即人性本身的开创性。透明、正确的数字只会综合判断,不会开创未来、生成全新的关系。而人类凭借其所特有的决断力,能从不完全知的状态开创一个新世界。

关键词：技术数字生命人性爱