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Multi-Objective Optimization for High-Performance Fe-Based Metallic Glasses Via Machine Learning Approach

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SSRN 2023年

作者： Zhang, Yu-Xing Xie, She-Juan Guo, Wei Ding, Jun Poh, Leong Hien Sha, Zhen-Dong State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University Xi'An710049 China China Electronics Technology Group Corporation 52nd Research Institute Hang’zhou310000 China State Key Lab of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology 1037 Luoyu Road Wuhan430074 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi'An710049 China Department of Civil and Environmental Engineering National University of Singapore 1 Engineering Drive 2 E1A-07–03 Singapore117576 Singapore International Center for Applied Mechanics China

Fe-based metallic glasses (MGs) are a class of promising soft magnetic materials that have received great attention in transformer industries. However, their limited glass-forming ability and poor plasticity severely hinder the development of new high-performance Fe-based MGs. Inspired by the significant development in machine learning (ML) technology, we herein propose a multi-objective optimization strategy to search for Fe-based MGs with optimal combinations of critical casting size (Dmax), saturation magnetization (Bs), and plasticity. The objective functions are built in combination with neural network (NN) models for predicting Dmax and Bs, as well as empirical formula for plasticity. The effect of number of hidden layers is investigated and the dropout regularization method employed to improve the prediction performance. Our results show that the predictions of Bs and Dmax by using alloy composition as the sole input perform well, as evidenced by their r2 values of 0.963 and 0.874, respectively. Multi-objective optimization based on the genetic algorithm is executed to obtain the Pareto front and Pareto-optimal solutions. The Pareto-optimal alloys predicted for the Fe83C1B x Si y P16- x-y and Fe x Co y Ni72 -x-y B19.2Si4.8Nb4 systems are in good agreement with those reported in experiments. This work thus showcases potential applications for the design of high-performance Fe-MGs against conflicting objectives. © 2023, The Authors. All rights reserved.

关键词： Saturation magnetization

Uranium Capture by a Layered 2d/2d Niobium Phosphate/Holey Graphene Architecture Via an Electro-Adsorption and Electrocatalytic Reduction Coupling Process

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SSRN 2022年

作者： Liao, Yun Lei, Ruilin Weng, Xiaofang Yan, Chuan Fu, Jiaxi Wei, Guoxing Zhang, Chen Wang, Meng Wang, Hongqing School of Chemistry and Chemical Engineering University of South China Hunan Hengyang421001 China Hunan Key Laboratory for the Design and Application of Actinide Complexes University of South China Hunan Hengyang421001 China School of Nuclear Science and Technology University of South China Hunan Hengyang421001 China

As an energy-efficient and eco-friendly technique, capacitive deionization (CDI) has shown great potential for uranium (U(VI)) capture recently. However, extracting U(VI) with high kinetics, capacity and selectivity remains a major challenge due to the current surface active sites-based material and co-existing ions in aqueous solution. Here we rationally designed a layered 2D/2D niobium phosphate/holey graphene (HGNbP) electrode material, and originally demonstrated its efficient uranium capture ability via an electro-adsorption and electrocatalytic reduction coupling process. The less-accumulative loose layered architecture, open polycrystalline construction of niobium phosphate with active phosphate sites, and rich in-plane nano-pores on conductive graphene nanosheets endowed HGNbP with fast charge/ion transport, high electroconductivity and superior pseudocapacitance, which enabled U(VI) ions first to be electro-adsorbed, then physico-chemical adsorbed, and finally electrocatalysis reduced/deposited onto electrode surface without the limitation of active sites under a low potential of 1.2V. Based on these virtues, the HGNbP exhibited a fast adsorption kinetics, with a high removal rate of 99.9% within 30min in 50 mg L -1 uranium solution, and a high adsorption capacity up to 1340 mg g -1 in 1000 mg L -1 uranium solution. Furthermore, the good recyclability and selectivity towards uranium were also realized. © 2022, The Authors. All rights reserved.

关键词： Graphene

Bandgap opening in MoTe2 thin flakes induced by surface oxidation

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Frontiers of physics 2020年第3期15卷 105-111页

作者： Yuan Gan Jiyuan Liang Chang-woo Cho Si Li Yanping Guo Xiaoming Ma Xuefeng Wu Jinsheng Wen Xu Du Mingquan He Chang Liu Shengyuan A.Yang Kedong Wang Liyuan Zhang National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Department of Physics Southern University of Science and TechnologyShenzhen518055China School of Physics and Electronics Hunan Normal UniversityChangsha410081China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore487372Singapore Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190China Department of Physics and Astronomy Stony Brook UniversityStony BrookNY11794USA Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing UniversityChongqing401331China

Recently,the layered transition metal dichalcogenide 1T′-MoTe2 has generated considerable interest due to their superconducting and non-trivial topological ***,we present a systematic study on 1T′-MoTe2 single-crystal and exfoliated thin-flakes by means of electrical transport,scanning tunnelling microscope(STM)measurements and band structure *** a bulk sample,it exhibits large magneto-resistance(MR)and Shubnikov–de Hass oscillations inρxx and a series of Hall plateaus inρxy at low ***,the MoTe2 thin films were intensively investigated with thickness *** samples,without encapsulation,an apparent transition from the intrinsic metallic to insulating state is observed by reducing *** such thin films,we also observed a suppression of the MR and weak anti-localization(WAL)*** attributed these effects to disorders originated from the extrinsic surface chemical reaction,which is consistent with the density functional theory(DFT)calculations and in-situ STM *** contrast to samples without encapsulated protection,we discovered an interesting superconducting transition for those samples with hexagonal Boron Nitride(h-BN)film *** results indicate that the metallic or superconducting behavior is its intrinsic state,and the insulating behavior is likely caused by surface oxidation in few layer 1T’-MoTe2 flakes.

关键词： two-dimensional materials metal-insulator transition layered transition metal dichalcogenides(TMDs) surface oxidation

Programmable shape-morphing microrobots for localized cancer cells treatment

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Research Square

Research Square 2021年

作者： Xin, Chen Jin, Dongdong Hu, Yanlei Yang, Liang Li, Rui Wang, Li Ren, Zhongguo Wang, Dawei Ji, Shengyun Hu, Kai Pan, Deng Wu, Hao Zhu, Wulin Shen, Zuojun Wang, Yucai Li, Jiawen Zhang, Li Wu, Dong Chu, Jiaru University of Science and Technology of China China The Chinese University of Hong Kong Hong Kong Institute of Nanotechnology Karlsruhe Institute of Technology Germany CAS Key Laboratory of Mechanical Behavior and Design of Materials Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes Department of Precision Machinery China

Microrobots have attracted great attentions due to their wide applications in microobjects manipulation and targeted drug delivery. To realize more complex micro/nano cargos manipulation (e.g., encapsulation and release) in biological applications, endowing microrobots with shapes adaptability with the environment is highly desirable. Here, designable shape-morphing microrobots (SMMRs) have been developed by programmatically encoding different expansion rate in a pH-responsive hydrogel. Combined with magnetic propelling, the shape-morphing microcrab (SMMC) is capable of performing targeted microparticle delivery, including gripping, transporting, and releasing through claws morphing. As a proof-of-concept demonstration, the shape-morphing microfish (SMMF) is designed to encapsulate drug (doxorubicin (DOX)) by closing mouth in phosphate buffer saline (PBS, pH~7.4) and release them by opening mouth in slightly acid solution (pH © 2021, CC BY.

关键词： Lanthanum compounds

Lewis Acidic Molten Salts Etching Route Driven Construction of Double-Layered Mxene-Fe/Carbon Nanotube/Silicone Rubber Composites for High-Performance Microwave Absorption

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SSRN 2022年

作者： Hu, Jiana Liang, Caiyun Li, Jiadong Lin, Chuanwei Liang, Yongjiu Wang, Hui Li, Xing Wang, Qianglong Dong, Dewen CAS Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China University of Science and Technology of China Hefei230026 China Wuhan Second Ship Design and Research Institute Wuhan430205 China

Transition metal carbide/nitride (MXene) materials have triggered intensive research interest in the field of microwave absorption (MA). However, the complicated fabrication process and monotonous loss mechanism of MXene materials seriously hinder their practical applications. Here, we first developed a green and facile synthesis of dielectric-magnetic MXene-Fe nanocomposites via one-step Lewis acidic molten salts etching, which were combined with carbon nanotube (CNT) filler and silicone rubber (SR) matrix to fabricate double-layered MXene-Fe/CNT/SR composites by casting and curing. The in-situ growth magnetic Fe nanoparticles on MXene and unique double-layered structure composed of MXene-Fe/SR as the upper absorption layer and CNT/SR as the bottom reflection layer imparted the composites with excellent MA properties by offering appropriate impedance matching, strengthened internal reflection, polarization, magnetic loss, and conductive loss. Accordingly, the proposed double-layered composites showed superior MA properties compared with other MXene-based composites. The MXene-Fe-45%/CNT-5%/SR sample showed a reflection loss value of −65.9 dB at 12 GHz and an effective absorption bandwidth up to 8.24 GHz at 2.86 mm thickness. The double-layered composites exhibited tunable absorption frequency between the whole Ku-band and X-band by simply regulating the sample thicknesses and filler contents. These features indicate that the developed double-layered MXene-Fe/CNT/SR composites have great potential for high-performance MA applications. This study offers a novel and simple strategy to develop high-efficiency and broadband MA materials. © 2022, The Authors. All rights reserved.

关键词： Carbides

Low Thermal Conductivity Phase Change Memory Superlattices

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arXiv

arXiv 2022年

作者： Ning, Jing Zhou, Xilin Wang, Yunzheng Yagi, Takashi Kalikka, Janne Teo, Siew Lang Song, Zhitang Bosman, Michel Simpson, Robert E. Singapore University of Technology and Design 8 Somapah Road 487372 Singapore Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai200050 China National Metrology Institute of Japan National Institute of Advanced Industrial Science and Technology Tsukuba Central 3 1-1-1 Umezono Tsukuba Ibaraki305-8563 Japan Computational Physics Laboratory Tampere University TampereFI-33014 Finland 2 Fusionopolis Way 138634 Singapore

Phase change memory devices are typically reset by melt-quenching a material to radically lower its electrical conductance. The high power and concomitantly high current density required to reset phase change materials is the major issue that limits the access times of 3D phase change memory architectures. Phase change superlattices were developed to lower the reset energy by confining the phase transition to the interface between two different phase change materials. However, the high thermal conductivity of the superlattices means that heat is poorly confined within the phase change material, and most of the thermal energy is wasted to the surrounding materials. Here, we identified Ti as a useful dopant for substantially lowering the thermal conductivity of Sb2Te3 – GeTe superlattices whilst also stabilising the layered structure from unwanted disordering. We demonstrate via laser heating that lowering the thermal conductivity by doping the Sb2Te3 layers with Ti halves the switching energy compared to superlattices that only use interfacial phase change transitions and strain engineering. The thermally optimized superlattice has (0 0 l) crystallographic orientation yet a thermal conductivity of just 0.25 W·m−1·K−1 in the"on" (set) state. Prototype phase change memory devices that incorporate this Ti-doped superlattice switch faster and and at a substantially lower voltage than the undoped superlattice. During switching the Ti-doped Sb2Te3 layers remain stable within the superlattice and only the Ge atoms are active and undergo interfacial phase transitions. In conclusion, we show the potential of thermally optimised Sb2Te3 – GeTe superlattices for a new generation of energy-efficient electrical and optical phase change memory. © 2022, CC BY.

关键词： Phase change memory

Novel high-density refractory high-entropy alloys with excellent mechanical properties at high temperatures and high strain rates

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Journal of Alloys and Compounds 2025年 1035卷

作者： Yanxin Ge Yansong Guo Hong Su Yudong Zhang Hang Fan Lisha Deng Zheng Tian Chun Ran Ali Arab Qiwen Hu Chenguang Wang Bin Jia Pengwan Chen State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019 China CSSC Systems Engineering Research Institute Beijing 100094 China National Key Laboratory of Nuclear Reactor Technology Nuclear Power Institute of China Chengdu 610213 China China Ordnance Society Beijing 100089 China Multidisciplinary Center for Infrastructure Engineering Shenyang University of Technology Shenyang 110870 China Faculty of land resources engineering Kunming University of Science and Technology Kunming Yunnan 650093 China

Based on traditional refractory high-entropy alloy (RHEA) NbMoTaW alloy, two novel RHEAs, Nb 0.2 Mo 0.8 Ta 2 WHf and Nb 0.5 Mo 0.5 TaWHf with densities of respectively 14.7 and 15.57 g/cm 3 were designed and fabricated by vacuum arc melting method. Phase components, microstructures, mechanical properties and fracture morphologies of the two RHEAs were investigated with comparison to the traditional NbMoTaW RHEA. Experimental results show that the two novel RHEAs present dual-BCC phase structure, which is different to that of the traditional NbMoTaW RHEA. Grain size of NbMoTaW is the largest, followed by Nb 0.2 Mo 0.8 Ta 2 WHf and Nb 0.5 Mo 0.5 TaWHf. The phenomenon of severe components segregation is observed in the two novel RHEAs. Nb 0.5 Mo 0.5 TaWHf has the best mechanical properties with microhardness of 653 ± 30 Hv, quasi-static yield stress of 1880 MPa and ductility of 2.6 %. Especially, the material still exhibits excellent strength at high temperatures of 600 – 1000 ℃. NbMoTaW and Nb 0.2 Mo 0.8 Ta 2 WHf show strain rate sensitivity within the strain rate range of 0.001 – 3000 s −1 . Compared to NbMoTaW and Nb 0.5 Mo 0.5 TaWHf, Nb 0.2 Mo 0.8 Ta 2 WHf has the best performance under dynamic loadings. Fracture morphologies of the three RHEAs agree with mechanical properties well. Chemical composition optimization is proven to be an effective method in improving both the density and the mechanical properties of the traditional NbMoTaW RHEA.

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Optimal design of Inhomogeneous Semi-Transparent Photovoltaic Windows Based on Daylight Performance and Visual Characters

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SSRN 2022年

作者： Li, Xinyi Peng, Jinqing Tan, Yutong He, Yingdong Li, Bojia Ju, Xiaolei Ji, Jie Zhang, Song Li, Nianping College of Civil Engineering Hunan University Changsha410082 China Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education Hunan University Changsha410082 China State key laboratory of building safety and environment China Academy of Building Research Beijing100013 China China Architecture Design & Research Group Beijing100044 China Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei230026 China LONGi Solar Technology Co. Ltd. Xi'An712000 China

Semi-transparent photovoltaic (STPV) windows are popular due to their energy-saving potential, but there is currently a lack of in-depth research on their daylight performance and visual characters. This study aims to assess the daylight performance and visual characters of inhomogeneous semi-transparent photovoltaic (IH-STPV) windows with various solar cell strip layouts through comparative experiments and a subjective survey. A visual angle model was first developed to quantify the correlation between the viewpoint distance away from the window and the solar cell strip width (CSW). Then, the visual angle model was used to optimize the CSW to mitigate the impact of cell strips on clearness and visual comfort. Based on the optimized CSW, the annual daylighting simulation in various daylight climate regions was performed by using the validated daylighting model. At last, the optimal solar cell coverage ratios (CCRs) in various daylight climate regions were recommended. The IH-STPV windows with identical CSW and CCR but with vertical cell (V-cell) strip layout and horizontal cell (H-cell) strip layout were compared in this study. The experimental results indicated that the daylight glare risk of the V-cell window was lower than that of the H-cell window. However, the difference in daylight glare risk became less significant when the viewpoint distance increases. Besides, the subjective survey results revealed that the visual discomfort caused by the solar cell strips could be alleviated by extending the viewpoint distance, and the correlation between the viewpoint distance and the maximum CSW was almost linear. The optimization results showed that the best CCR corresponding to the CSWs of 1 mm, 1mm, 1.5mm, and 2 mm were 70%, 50%, 30%, and 30%, respectively at the viewpoint distances of 1 m, 2 m, 3 m, and 4 m in Beijing. In addition, cities at higher latitudes tended to require a higher CCR due to the low solar altitude angle which causes the higher frequency to see th

关键词： Solar cells

A Sharing-Economy Inspired Pricing Mechanism for Multi-Access Edge Computing

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A Sharing-Economy Inspired Pricing Mechanism for Multi-Acces...

GLOBECOM 2020 - 2020 IEEE Global Communications Conference

作者： Marie Siew Desmond Cai Lingxiang Li Tony Q.S. Quek Information Systems Technology and Design Pillar Singapore University of Technology and Design Institute of High Performance Computing A*Star Singapore National Key Laboratory on Communications University of Electronic Science and Technology of China

ISBN: (数字)9781728182988

ISBN: (纸本)9781728182995

Multi-access Edge Computing (MEC) is an emerging paradigm which allows users to offload their computationally intensive tasks to the network edge. In this paper, we analyze resource allocation in MEC from the market and economic perspective. Due to extremely heterogeneous usage demands across users in the future IoE market, current coarse-grained pricing schemes result in partial wastage: some users would have excess un-utilized resource quota while others might have reserved insufficient resources. Therefore, we introduce a novel sharing economy-inspired business model, where a platform facilitates the sharing of resource quota among users, increasing resource efficiency. The goal is to maximize the overall welfare of users who join the sharing platform. As the platform lacks control and has imperfect knowledge of users' payoff functions and distributions, a distributed pricing mechanism is proposed. In our mechanism, the platform and users jointly arrive at an equilibrium. We prove that the equilibrium point of the mechanism is the socially optimal point. Simulations illustrate convergence, the robustness of our mechanism to changes in demand and supply, and that sharing increases the welfare of users.

关键词： Pricing Supply and demand Resource management Task analysis Sharing economy Dynamic scheduling Computational modeling