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In-situ growth of carbon nanotubes on ZnO to enhance thermoelectric and mechanical properties

Journal of advanced Ceramics 2022年第12期11卷 1932-1943页

作者： Shengjie FAN Tingting SUN Meng JIANG Shijia GU Lianjun WANG Haixue YAN Wan JIANG State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK

As a high-temperature thermoelectric(TE)material,ZnO offers advantages of non-toxicity,chemical stability,and oxidation resistance,and shows considerable promise as a true ready-to-use module under air ***,poor electrical conductivity and high thermal conductivity severely hinder its *** nanotubes(CNTs)are often used as a reinforcing phase in composites,but it is difficult to achieve uniform dispersion of CNTs due to van der Waals ***,we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition(CVD)technology,in order to improve their electrical conductivity and mechanical properties,as well as reducing the thermal ***,magnetic nickel(Ni)nanoparticles are introduced as catalysts for promoting the formation of CNTs,which can also enhance the electrical and thermal transportation of ZnO ***,the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm^(−1) due to the formation of dense and uniform conductive CNT *** lattice thermal conductivity(κ_(L))is obviously declined by the intensification of phonon scattering,resulting from the abundant grain boundaries and interfaces in ZnO-CNT ***,the maximum dimensionless figure of merit(zT)of 0.04 at 800 K is obtained in 2.0%Ni-CNTs/ZnO,which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic *** addition,the mechanical properties of composites including Vickers hardness(HV)and fracture toughness(K_(IC))are also *** work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.

关键词： ZnO carbon nanotubes(CNTs) in-situ grown thermoelectric(TE) mechanical properties

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The High Efficiency Control Method of PMSMs Based on Gradient Descent Algorithm 4

The High Efficiency Control Method of PMSMs Based on Gradien...

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4th IEEE Student Conference on Electric Machines and Systems, SCEMS 2021

作者： Ling, Zaixun Chen, Hao Cheng, Cheng Shuai, Kang Zheng, Jingwen Wang, Jin State Grid Hubei Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781665436816

Maximum efficiency per ampere(MEPA) strategy based on loss model of motor is the commonly used high efficient control algorithm for permanent magnet synchronous motors. It takes into account the minimization of copper loss and iron loss, so the efficiency is higher than that of maximum torque per ampere(MTPA) strategy. In order to solve the problem that the process is too complicated when the MEPA strategy is used to obtain the optimal current, the gradient descent algorithm is introduced, and the simulation results show that it has a good effect. © 2021 IEEE.

关键词： Permanent magnets

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Numerical simulation and experimental study of hybrid laser-electric arc welding between dissimilar Mg alloys

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Journal of Central South University 2022年第10期29卷 3476-3488页

作者： MA Yu-lin ZHU Jian ZHANG Long-mei REN Zhi-qiang ZHAO Yang WANG Wen-yu WANG Xiao-ming HUI Xi-dong WU Yong-ling ZHENG Hong-yu School of Mechanical Engineering Shandong University of TechnologyZibo 255000China National Key Laboratory for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials(University of Science and Technology Beijing) Beijing 100083China

This work aims to establish a suitable numerical simulation model for hybrid laser-electric arc heat source welding of dissimilar Mg alloys between AZ31 and AZ80. Based on the energy conservation law and Fourier’s law of heat conduction, the differential equations of the three-dimensional temperature field for nonlinear transient heat conduction are built. According to the analysis of nonlinear transient heat transfer, the equations representing initial conditions and boundary conditions are obtained. The “double ellipsoidal heat source + 3D Gaussian heat source”combination was chosen to construct the laser-electric arc hybrid heat source. The weld bead morphologies and the distribution of temperature, stress, displacement and plastic strains are numerically simulated. The actual welding experiments were performed by a hybrid laser-electric arc welding machine. The interaction mechanism between laser and electric arc in the hybrid welding of Mg alloys is discussed in detail. The hybrid heat source can promote the absorption of laser energy and electric arc in the molten pool, resulting in more uniform energy distribution in the molten pool and the corresponding improvement of welding parameters. This work can provide theoretical guidance and data supports for the optimization of the hybrid laser-electric arc welding processes for Mg alloys.

关键词： hybrid laser-electric arc welding dissimilar Mg alloys welding numerical simulation interaction mechanisms welding optimizations

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Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan Han Qifeng Han Yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

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Phase transformation of two-dimensional nanomaterials: state-of-the-art progress in designing strategies and catalytic applications

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Science China Materials 2025年第1期68卷 65-85页

作者： Zeqi Wu Feng Niu Da Chen Yuexiang Huang Guigao Liu Yong Zhou Wenguang Tu Xi Zhu Zhigang Zou College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)Shenzhen 518172China National Special Superfine Powder Engineering Research Center School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing 210093China

Phase transformation of two-dimensional(2D)nanomaterials can lead to significant changes in electronic and optical properties,which enables the development of novel *** strategies for phase engineering of 2D nanomaterials have drawn considerable attention in recent *** review focuses on the state-of-the-art progress in the phase transformation of 2D nanomaterials and their catalytic ***,the basic concepts of phase transformation and the outstanding electronic and optical properties induced by phase transformation are briefly ***,different strategies for achieving phase transformation are discussed in detail and classified into several types based on their characteristics,including(i)doping,(ii)external fields,(iii)optical irradiation,(iv)strain effect,(v)high-energy particle excitation,and(vi)thermal *** applications of 2D nanomaterials in catalysis based on phase transformation have also been ***,a summary of the technical challenges to phase control in 2D nanomaterials and potential opportunities for developing novel applications is presented.

关键词： phase transformation two-dimensional nanomaterials strategy catalysis application

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Data-Driven Bipartite Consensus Control for Large Workpieces Rotation of Nonlinear Multi-Robot Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第6期12卷 1144-1158页

作者： Haoran Tan Xueming Zhang Yaonan Wang You Wu Yun Feng Zhongsheng Hou State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Electrical and Information Engineering Greater Bay Area Institute for Innovation Hunan University Changsha China National Engineering Laboratory for Robot Visual Perception and Control Technology College of Electrical and Information Engineering Hunan University Changsha China School of Automation Qingdao University Qingdao China

In this paper, a novel data-driven bipartite consensus control scheme is proposed for the rotation problem of large workpieces with multi-robot systems (MRSs) under a directed communication topology. The rotation of a large workpiece is described as the MRSs with cooperation and antagonism interaction. By the signed graph theory, it is further transformed into a bipartite consensus control problem, where all followers are uniformly degenerated into the general nonlinear systems based on the lateral error model. To augment the flexibility of control protocol and improve control performance, a higher-dimensional full form dynamic linearization (FFDL) technique is committed to the MRSs. The control input criterion function consists of the data model based on FFDL and the bipartite consensus error based on the signed graph theory, and the proposed control protocol is given by optimizing this criterion function. In this way, this scheme has a higher degree of freedom and better adaptive adjustment capability while not excessively increasing the control method complexity, and it can also be compatible with other forms of dynamic linearization techniques in MRSs. Further, three matrix norm lemmas are introduced to deal with the challenges of stability analysis caused by higher matrix dimensions and more robots. Finally, the effectiveness of the proposed method is verified by numerical simulations.

关键词： Protocols Linearization techniques Consensus control Numerical simulation Graph theory Stability analysis Data models Topology Multi-robot systems Nonlinear systems

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Single Ti atoms coupled with Ti-O clusters enable low temperature hydrogen cycling by sodium alanate

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Rare Metals 2024年第6期43卷 2671-2681页

作者： Zhuang-He Ren Xin Zhang Wen-Xuan Zhang Zhen-Guo Huang Li-Mei Yang Ya-Xiong Yang Zheng-Long Li Juan Li Wen-Ping Sun Ming-Xia Gao Hong-Ge Pan Yong-Feng Liu State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310058China School of Civil&Environmental Engineering.University of Technology Sydney Sydney2007 NSWAustralia Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an 710021China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China

Ti-based catalysts are known to improve the hydrogen storage performance of NaAlH4by facilitating the dissociation/recombination of H-H and Al-H *** catalytic activity of metallic Ti species strongly depends on its particle size and *** clusters and even single atoms are therefore highly desirable,but their controllable fabrication has been highly *** rein,we demonstrate a novel facile sonochemical synthesis of a Ti-O clusters featuring single Ti atom catalyst at room *** reducing TiCl_(4)by MgBu_(2)with ultrasound instead of heating as driving force,numerous single Ti atoms coupled with Ti-O clusters with Ti loading on graphene(Ti_(1)/Ti-O@G)up to 22.6 wt%have been successfully *** prepared Ti_(1)/Ti-O@G contributes high reactivity and superior catalytic activity,therefore enabling full dehydrogenation of NaAlH_(4)at 80℃in thermogravimetric mode and re-hydrogenation at 30℃and 10 MPa with 4.9 wt% H_(2).This fact indicates for the first time that single Ti atom catalyst with high loading is highly effective in catalyzing hydrogen cycling of NaAlH4at remarkably reduced temperatures.

关键词： Hydrogen storage Nanocatalysis Transition metals Single Ti atoms NaAlH_(4)

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engineering SIRPα cellular membrane-based nanovesicles for combination immunotherapy

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Nano Research 2023年第5期16卷 7355-7363页

作者： Mingyue Wang Yanfang Wang Yeteng Mu Fuxu Yang Zebin Yang Yuxuan Liu Lili Huang Shi Liu Xingang Guan Zhigang Xie Zhen Gu School of Medicine Taizhou UniversityTaizhou 318000China College of Medical Technology Beihua UniversityJilin 132013China Key Laboratory of Advanced Drug Delivery Systems of Zhejiang Province College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China Jinhua Institute of Zhejiang University Jinhua 321299China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of General Surgery Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou 310016China Zhejiang Laboratory of Systems&Precision Medicine Zhejiang University Medical CenterHangzhou 311121China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Immune checkpoint inhibitors(ICIs)have revolutionized cancer treatment for their unprecedented clinical *** regulatory proteinα(SIRPα)is a phagocytic checkpoint expressed on macrophages,dendritic cells,other myeloid *** cells inhibit macrophage phagocytosis through the interaction of the CD47-SIRPα*** the CD47-SIRPαaxis has therefore been a promising strategy in restoring the immune attack against ***,we engineered cellular membrane nanovesicles(NVs)presenting SIRPαreceptors for phagocytosis checkpoint blockade to augment the antitumor immune ***,zebularine(Zeb),an inhibitor of DNA methyltransferase,was encapsulated into SIRPαNVs to reprogram the immunosuppressive tumor microenvironment together with blockade of phagocytosis *** is demonstrated that SIRPα@Zeb can improve tumor immunogenicity,the polarization of tumor-associated macrophages to the M1 phenotype,increase the infiltration of CD8^(+)T lymphocytes in *** robust antitumor immune response induced by SIRPα@Zeb significantly suppressed tumor growth and extended mice-bearing melanoma xenograft survival.

关键词： drug delivery signal regulatory proteinα nanovesicle tumor-associated macrophages cancer immunotherapy

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A Knowledge-enriched Framework for Life Cycle Assessment in Manufacturing 29

A Knowledge-enriched Framework for Life Cycle Assessment in ...

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29th CIRP Conference on Life Cycle engineering, LCE 2022

作者： Wang, Yanan Tao, Jiaqi Liu, Weipeng Peng, Tao Tang, Renzhong Wu, Qi State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310027 China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province Zhejiang University Hangzhou310027 China Technology Siemens Ltd. China Beijing100102 China

Even though carbon neutralization is promised by several countries, many developed tools for life cycle assessment (LCA) or sustainability performance is still not widely and easily used in industrial practices. A big gap exists between having the tools and using the tools, which is currently facilitated by human expertise. LCA practitioners should embrace and take advantage the rapid development of knowledge graph (KG) technology. In this paper, the important position and key methodologies of KG are presented in the context of LCA, latest advances are reviewed and presented. A framework of knowledge-enriched LCA is proposed which was illustrated with a LCA-oriented process-flow knowledge graph (PFKG) for inventory analysis. The knowledge acquisition and construction of PFKG was demonstrated with aluminum die casting, and on top of which a recommendation application of PFKG was discussed in a case of five-star feet of office chair. PFKG can facilitate non-experts in identifying the complex structured relationship between process and flow, and recommend possible life cycle inventory data. It is envisioned that merging with KG will boost engineering sustainability in a more practical manner. © 2022 Elsevier B.V.. All rights reserved.

关键词： Life cycle

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Review of advanced progress ofχ^(2)-based all-optical devices on thin-film lithium niobate

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Chinese Optics Letters 2023年第10期21卷 79-92页

作者：石磊宋元军唐杰秦妍妍薛小枚周桓立陈泽贤李选钱广张晓阳张彤 Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing 210016China Nanjing Electronic Devices Institute Nanjing 210016China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Educationand School of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology Southeast University Suzhou CampusSuzhou 215123China

The technological innovation of thin-film lithium niobate(TFLN)is supplanting the traditional lithium niobate industry and generating a vast array of ultra-compact and low-loss optical waveguide devices,providing an unprecedented prospect for chip-scale integrated *** of its unique strong quadratic nonlinearity,TFLN is widely used to create new coherent light,which significantly promotes all-optical signal processes,especially in terms of ***,we review recent advances in TFLN,review the thorough optimization strategies of all-optical devices with unique characteristics based on TFLN,and discuss the challenges and perspectives of the developed nonlinear devices.

关键词： thin-film lithium niobate second-order nonlinearity nonlinear integrated optics

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