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基于三圆弧理论的变矩器循环圆逆向设计分析

北京汽车 2024年第1期 21-24页

作者：赵伟伟全东张晨光王凯峰陕西法士特齿轮有限责任公司陕西西安710119 北京航空航天大学交通科学与工程学院北京100191

目前汽车变速器中液力变矩器的循环圆的逆向设计多基于逆向点云拟合而成,所得到的循环圆曲率变化较大,且调整较困难,不利于循环圆的设计修改以及后续系列化设计。基于三圆弧理论和竞品变矩器的关键逆向参数对循环圆进行逆向设计,结果表... 详细信息

目前汽车变速器中液力变矩器的循环圆的逆向设计多基于逆向点云拟合而成,所得到的循环圆曲率变化较大,且调整较困难,不利于循环圆的设计修改以及后续系列化设计。基于三圆弧理论和竞品变矩器的关键逆向参数对循环圆进行逆向设计,结果表明,所绘制的循环圆逆向精度高,与竞品点云数据拟合良好,相对误差的最大值为0.82%,且平滑程度有所提高,曲率变化率降低21.1%,曲率变化更加平稳,同时相比点拟合,三圆弧逆向循环圆变矩比基本保持不变,公称力矩最高提升3.34%,最高效率由81.7%提升至83.6%,提升1.9个百分点。

关键词：变矩器循环圆三圆弧逆向设计试验

Efficient charge transfer in WS2/WxMo1-xS2 heterostructure empowered by energy level hybridization

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Science China(Information Sciences) 2023年第2期66卷 219-226页

作者： Xuhong AN Yehui ZHANG Yuanfang YU weiwei zhao Yutian YANG Xianghong NIU Xuan LUO Junpeng LU Jinlan WANG Zhenhua NI School of Physics and Key Laboratory of MESMS of the Ministry of Education Southeast University New Energy Technology Engineering Laboratory of Jiangsu Province and School of Science Nanjing University of Posts and Telecommunications Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences

Photoinduced charge transfer(CT) is decisive to the efficiency and speed of photoelectric conversion in two-dimensional(2D) van der Waals(vd Ws) heterostructures. Generally, CT rate enhancement is realized by increasing the band offset(BO). In this study, we propose that a fast and efficient CT can be realized via strong hybridization of energy levels in 2D vd Ws heterostructures with minimal BO. Firstprinciples calculations reveal that the smallest energy difference between conduction-band edges and minimal BO in the WS2/WxMo1-xS2(x = 0.78) heterostructure yields the strong hybridization of energy levels and then results in ultrafast CT(2.7 ps). Experimental results agree with theoretical calculations. The photoluminescence of WS2is quenched in the WS2/WxMo1-xS2(x = 0.78) heterostructure, attributable to the strong hybridization-induced fast and efficient CT. This study provides insights into the mechanism of CT in heterostructures and offers new strategies to create superior optoelectronic devices with fast and efficient photoelectric conversion.

关键词： van der Waals heterostructure band offset hybridization strength charge transfer photoluminescence quenching

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牡丹微型盆栽品种筛选

安徽农学通报 2024年第11期30卷 42-48页

作者：张佩王建民赵伟伟杨丽盖伟玲菏泽市牡丹区牡丹研究院山东菏泽274000 山东省菏泽信息工程学校山东菏泽274000 石家庄植物园河北石家庄050299 青岛农业大学山东青岛266109

为筛选适合微型盆栽的牡丹品种,进一步完善其生产技术体系,本研究选择成花率、花朵直径和花态等9个性状指标,对黄冠等33个牡丹品种进行综合评价。结果表明,共筛选出富贵满堂等11个品种在春季露天微型盆栽生产中表现良好,胜葛巾紫等12个... 详细信息

为筛选适合微型盆栽的牡丹品种,进一步完善其生产技术体系,本研究选择成花率、花朵直径和花态等9个性状指标,对黄冠等33个牡丹品种进行综合评价。结果表明,共筛选出富贵满堂等11个品种在春季露天微型盆栽生产中表现良好,胜葛巾紫等12个品种表现一般;巴茨拉等18个品种在春季日光温室微型盆栽生产中表现较好,胜葛巾紫等6个品种表现一般;紫二乔等10个品种在微型盆栽春节催花生产中表现良好,太阳等11个品种表现一般。本研究通过对微型盆栽牡丹品种的筛选,为牡丹相关品种推广应用和微型盆栽的生产提供参考。

关键词：牡丹微型盆栽观赏性状植株性状筛选标准

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Persistent radical anion of perylene dianhydride:an emerging metal-free photocatalyst for near-infrared photocontrolled RAFT polymerization

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Science China Chemistry 2024年第2期67卷 677-686页

作者： Haitao zhao Guoqing Bian Xiang Xu weiwei He Lifen Zhang Zhenping Cheng State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Developing a new type of photocatalyst(PC) and catalytic mechanism for near-infrared(NIR) photocontrolled reversibledeactivation radical polymerization(RDRP) system is charming but ***,a novel PC of the persistent radical anion(PRA)(possessing the properties of both radical and anion) was developed for NIR photocontrolled reversible additionfragmentation chain transfer(RAFT) polymerization,enabling successful polymerization while gaining a deep insight into the mechanism of photo-induced electron transfer RAFT(PET-RAFT) *** from the conventional and wellaccepted reductive quenching(RQ) pathway,in which the radical anion intermediates of PCs(PCs^(·-)) must be generated in an excited state(ES),here,the PRA(3,4,9,10-perylenetetracarboxylic dianhydride radical anion(PTCDA^(·-))) could generate conveniently in situ in the ground state(GS) and subsequently serve as highly efficient PC in the NIR region(740–850 nm).The successful implementation of this strategy elucidates the peculiar role played by light and the real way of electron transfer *** fact,the transfer of a single electron from PRA to chain transfer agent(CTA) and cleavage of the C–S bonds is a process from ES to GS,rather than always from GS(PCs^(·-)) to GS(CTA) in the RQ pathway as is well known to *** addition,the excellent spatial-temporal control and powerful penetration ability of the NIR light were also confirmed by this PRAcatalyzed polymerization system.

关键词： photocatalyst persistent radical anion(PRA) near-infrared(NIR)light reversible-deactivation radical polymerization(RDRP) photo-induced electron transfer RAFT(PET-RAFT)polymerization

Bipartite Consensus of Discrete-Time Double-Integrator Multi-Agent Systems with Measurement Noise

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Journal of Systems Science & Complexity 2018年第6期31卷 1525-1540页

作者： MA Cuiqin zhao weiwei zhao Yunbo School of Mathematical Sciences Qufu Normal UniversityQufu 273165China. No.1Senior Middle School of Qufu Qufu 273165China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

The effects of measurement noise are investigated in the context of bipartite consensus of multi-agent systems. In the system setting, discrete-time double-integrator dynamics are assumed for the agent, and measurement noise is present for the agent receiving the state information from its neighbors. Time-varying stochastic bipartite consensus protocols are designed in order to lessen the harmful effects of the noise. Consequently, the state transition matrix of the closed-loop system is analyzed, and sufficient and necessary conditions for the proposed protocol to be a mean square bipartite consensus protocol are given with the help of linear transformation and algebraic graph theory. It is proven that the signed digraph to be structurally balanced and having a spanning tree are the weakest communication assumptions for ensuring bipartite consensus. In particular, the proposed protocol is a mean square bipartite average consensus one if the signed digraph is also weight balanced.

关键词： Bipartite consensus discrete-time double-integrator measurement noise multi-agent systems

Additively Manufactured Flexible Electronics with Ultrabroad Range and High Sensitivity for Multiple Physiological Signals'Detection

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Research 2022年第4期2022卷 707-717页

作者： Huanhuan Feng Yaming Liu Liang Feng Limeng Zhan Shuaishuai Meng Hongjun Ji Jiaheng Zhang Mingyu Li Peng He weiwei zhao Jun Wei Sauvage Laboratory for Smart Materials Shenzhen Key Laboratory of Flexible Printed Electronics TechnologyHarbin Institute of Technology(Shenzhen)China State Key Laboratory of Advanced Welding and Joining(Shenzhen) Harbin Institute of Technology(Shenzhen)China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyChina

Flexible electronics can be seamlessly attached to human skin and used for various purposes, such as pulse monitoring, pressure measurement, tensile sensing, and motion detection. Despite their broad applications, most flexible electronics do not possess both high sensitivity and wide detection range simultaneously;their sensitivity drops rapidly when they are subjected to even just medium pressure. In this study, ultrabroad-range, high-sensitivity flexible electronics are fabricated through additive manufacturing to address this issue. The key to possess high sensitivity and a wide detection range simultaneously is to fabricate flexible electronics with large depth-width ratio circuit channels using the additive manufacturing inner-rinsing template method. These electronics exhibit an unprecedented high sensitivity of 320 kPa^(−1) over the whole detection range, which ranges from 0.3 to 30,000 Pa (five orders of magnitude). Their minimum detectable weight is 0.02 g (the weight of a fly), which is comparable with human skin. They can stretch to over 500% strain without breaking and show no tensile fatigue after 1000 repetitions of stretching to 100% strain. A highly sensitive and flexible electronic epidermal pulse monitor is fabricated to detect multiple physiological signals, such as pulse signal, breathing rhythm, and real-time beat-to-beat cuffless blood pressure. All of these signals can be obtained simultaneously for detailed health detection and monitoring. The fabrication method does not involve complex expensive equipment or complicated operational processes, so it is especially suitable for the fabrication of large-area, complex flexible electronics. We believe this approach will pave the way for the application of flexible electronics in biomedical detection and health monitoring.

关键词： fatigue additive stretching

Enhanced bifunctional catalytic activities of N-doped graphene by Ni in a 3D trimodal nanoporous nanotubular network and its ultralong cycling performance in Zn-air batteries

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Journal of Energy Chemistry 2022年第3期31卷 466-473,I0013页

作者： Yanyi Zhang Xiang-Peng Kong Xiaorong Lin Kailong Hu weiwei zhao Guoqiang Xie Xi Lin Xingjun Liu Yoshikazu Ito Hua-Jun Qiu School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina Shenzhen R&D Center for Al-based Hydrogen Hydrolysis Materials Shenzhen 518055GuangdongChina State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Blockchain Development and Research Institute Harbin Institute of TechnologyShenzhen 518055GuangdongChina Institute of Applied Physics Graduate School of Pure and Applied SciencesUniversity of TsukubaTsukuba 305-8573Japan

Free-standing and fexible air electrodes with long-lasting bifunctional activities for both the oxygen reduction reaction(ORR)and the oxygen evolution reaction(OER)are crucial to the development of wearable Zn-air rechargeable *** this work,we synthesize a fexible air electrode consisting of 3D nanoporous N-doped graphene with trimodal shells and Ni particles through repeated chemical vapor deposition(CVD)and acidic etching *** results indicate that such trimodal graphene morphology significantly enhances the active N-dopant sites and graphene-coated Ni surface,which consequentially boosts both the ORR and OER activities,as well as catalytic ***-principles density functional theory(DFT)calculations reveal the synergetic effects between the Ni and the N-doped graphene;namely,the Ni nanoparticles boost the bifunctional activities of the coated N-doped graphene,and in turn the graphene-covering layers enhance the stability of *** to the better protection from the triple graphene shells,our trimodal N-doped graphene/Ni-based Zn-air battery can be stably discharged/recharged beyond 2500 h with low *** is reasonable to expect that such freestanding trimodal graphene/Ni would be promising in many fexible energy conversion/storage devices.

关键词： Triple shells Bifunctional Hierarchical Cycling durability ORR/OER

Large-area flexible and transparent UV photodetector based on cross-linked Ag NW@ZnO NRs with high performance

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Journal of Materials Science & Technology 2022年第15期110卷 65-72页

作者： Lin Zhang Nuomei Li Qiuchen Ma Jiahui Ding Chuang Chen zhaocheng Hu weiwei zhao Yufeng Li Huanhuan Feng Mingyu Li Hongjun Ji Sauvage Laboratory for Smart Materials ShenzhenKey Laboratory of Flexible Printed Electronics TechnologySchool of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China

A series of large-area,flexible and transparent ultraviolet(UV)photodetectors(PDs)based on Ag nanowire(NW)@ZnO nanorods(NRs)are fabricated by an inexpensive,facile and effective *** Ag NW@ZnO NRs are successfully synthesized using a two-step method in an oil bath with a high surface-to-volume ratio and good *** PDs are fabricated by drop-coating with different drop-coating times on the surface of polyethylene terephthalate(PET)coupled with Au *** optimizing the cross-linked network of Ag NW@ZnO NRs,PD2 with a size greater than 25 mm exhibits excellent photoresponse under UV light illumination of 365 nm(1.3 m W cm^(-2))with a bias of 5 V:a high sensitivity of over 10^(3),and a much shorter rise/decay time of 2.6 s/2.3 ***,the detector exhibits an average transmittance of more than 70%in the visible light region,as well as good flexibility and excellent mechanical stability under a bending angle of 120°over 1000 circles *** integral advantages have significant potential for practical applications and mass production.

关键词： Ag NW@ZnO NRs Low dark current Rapid response Transparent Flexible Large-area

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全自动流水线式内镜清洗消毒系统设计

自动化仪表 2024年第5期45卷 103-106页

作者：谈震锞戴吟王志国赵伟伟刘飞江南大学轻工过程先进控制教育部重点实验室江苏无锡214122 江南大学自动化研究所江苏无锡214122 无锡华纳医疗科技有限公司江苏无锡214122

内镜的清洗消毒对于重复性的内镜手术而言至关重要。因此,内镜的清洗消毒需要有更高的效率以满足当前大量的内镜手术需求。为此,创新性地研发了一种基于可编程逻辑控制器(PLC)的全自动流水线式内镜清洗消毒系统。根据清洗消毒流程特点,... 详细信息

内镜的清洗消毒对于重复性的内镜手术而言至关重要。因此,内镜的清洗消毒需要有更高的效率以满足当前大量的内镜手术需求。为此,创新性地研发了一种基于可编程逻辑控制器(PLC)的全自动流水线式内镜清洗消毒系统。根据清洗消毒流程特点,设计了多槽流水线式结构。通过自动控制系统可完成符合国标和行标的检测、清洗、消毒、转运等流程。系统具备检修、急停和声光报警灯功能,可利用触摸屏实现信息记录和追溯。该系统能有效地提高清洗消毒效能、保证清洗消毒质量,从而缓解当下内镜使用紧缺的现状。该设计不仅提高了医疗器械的智能化、自动化水平,还对医疗设备的发展和研制具有开创性价值,因而具有广阔的应用前景。

关键词：医疗设备全自动流水线式内镜清洗消毒控制模块可编程逻辑控制器智能化