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A multifunctional stealthy material for wireless sensing and active camouflage driven by configurable polarization

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Journal of Materials Science & Technology 2023年第1期132卷 42-49页

作者： Min Zhang Mao-Sheng cao qiang-qiang Wang Xi-Xi Wang Wen-qiang cao Hui-Jing Yang Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore Department of Physics Tangshan Normal UniversityTangshan 063000China School of Information Engineering Minzu University of ChinaBeijing 100081China

The dipole species transformation and polarization relaxation configuration are achieved by changing the cobalt ion stoichiometry,which precisely tailors the electromagnetic attenuation performance of bismuth iron cobalt *** the stoichiometric ratio of Fe:Co is 19:1,the optimal reflection loss reaches-60 *** high electromagnetic attenuation performance significantly improve the linear sensitivity of the strain response and active customized stealth capability of the designed multifunctional capacitor-like ***,the wireless multifunctional design integrates energy attenuaten of electromagnetic wave with the wireless sensing and active camouflage functions for the first *** work provides an important step for the realization of electromagnetical multifunctional applications including electromag-netic protection and electromagnetic sensing in artificial beings,medical health and even space travel.

关键词： Electromagnetic absorption Polarization relaxation Electromagnetic sensing Active camouflage

Developing MXenes from Wireless Communication to Electromagnetic Attenuation

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Nano-Micro Letters 2021年第7期13卷 188-221页

作者： Peng He Mao-Sheng cao Wen-qiang cao Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Information Engineering Minzu University of ChinaBeijing 100081People’s Republic of China

There is an urgent global need for wireless communication utilizing materials that can provide simultaneous flexibility and high *** the harmful effects of electromagnetic(EM)radiation from wireless communication is a persistent research hot ***-dimensional(2D)materials are the preferred choice as wireless communication and EM attenuation materials as they are lightweight with high aspect ratios and possess distinguished electronic ***,as a novel family of 2D materials,have shown excellent properties in various fields,owing to their excellent electrical conductivity,mechanical stability,high flexibility,and ease of *** date,research on the utility of MXenes for wireless communication has been actively ***,MXenes have become the leading materials for EM ***,we systematically review the recent advances in MXene-based materials with different structural designs for wireless communication,electromagnetic interference(EMI)shielding,and EM wave *** relationship governing the structural design and the effectiveness for wireless communication,EMI shielding,and EM wave absorption is clearly ***,our review mainly focuses on future challenges and guidelines for designing MXene-based materials for industrial application and foundational research.

关键词： MXene Wireless communication Electromagnetic wave absorption Electromagnetic interference shielding

Mean-square Stability of Stochastic Age-dependent Delay Population Systems with Jumps

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Acta Mathematicae Applicatae Sinica 2018年第1期34卷 145-154页

作者： qiang LI Qi-min ZHANG Bo-qiang cao School of Mathematics and Statistics Ningxia University Yinchuan 750021 China School of Mathematics and Information Sciences Beifang University of Nationalities Yinchuan 750021 China

In this paper, we present the compensated stochastic θ method for stochastic age-dependent delay population systems（SADDPSs） with Poisson jumps. The definition of mean-square stability of the numerical solution is given and a sufficient condition for mean-square stability of the numerical solution is derived. It is shown that the compensated stochastic θ method inherits stability property of the numerical solutions. Finally,the theoretical results are also confirmed by a numerical experiment.

关键词： stochastic age-dependent delay population systems compensated stochastic θ method poisson jumps mean-square stability

A Critical Review of Real Gas Effects on the Regenerative Refrigerators

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Journal of Thermal Science 2021年第3期30卷 782-806页

作者： cao qiang LUAN Mingkai LI Peng WEI Li WU Yan Institute of Refrigeration and Cryogenics School of Mechanical EngineeringTongji UniversityShanghai 201804China Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji UniversityShanghai 201804China Department of Electrical Engineering School of Electronics and Information EngineeringTongji UniversityShanghai 201804China

The regenerative refrigeration is an important reverse work-heat conversion cycle with a theoretical coefficient of performance(COP)identical to the Carnot *** regenerative refrigerators are capable of working down to 4 K and largely fulfill the refrigeration requirement of modern technologies in many fields,especially for space ***,the enthalpy flow associated with the pressure dependence,abbreviated as pressure-induced enthalpy flow,brought about by real gas effects degrades the theoretical COP of the refrigerator to below about 30% of the Carnot efficiency at the temperatures of below the critical *** paper reviews the long history of exploring the real gas effects which dates back to the 1970 s and continues to *** explorations of uncovering the loss mechanism and reducing such losses are *** theories that are in accordance with experimental results and simulation results are *** further carry out analyses on the expansion components,including the pulse tube and the clearance *** inferences are made in order to explore the long-lasting puzzles about real gas *** is emphasized that the underlying cause of the loss in the regenerator is an indirect effect of the real gas *** study about carrying out a direct verification of the theory is proposed.

关键词： real gas effects regenerative refrigerators loss mechanism reduction methods

A Nano-Micro Engineering Nanofiber for Electromagnetic Absorber,Green Shielding and Sensor

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Nano-Micro Letters 2021年第2期13卷 112-123页

作者： Min Zhang Chen Han Wen-qiang cao Mao-Sheng cao Hui-Jing Yang Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China Department of Physics Tangshan Normal UniversityTangshan 063000People’s Republic of China School of Information Engineering Minzu University of ChinaBeijing 100081People’s Republic of China

It is extremely unattainable for a material to simultaneously obtain efficient electromagnetic(EM)absorption and green shielding performance,which has not been reported due to the competition between conduction loss and ***,by tailoring the internal structure through nano-micro engineering,a NiCo2O4 nanofiber with integrated EM absorbing and green shielding as well as strain sensing functions is *** the improvement of charge transport capability of the nanofiber,the performance can be converted from EM absorption to shielding,or even ***,as the conductivity rising,the reflection loss declines from −52.72 to −10.5 dB,while the EM interference shielding effectiveness increases to 13.4 dB,suggesting the coexistence of the two EM ***,based on the high EM absorption,a strain sensor is designed through the resonance coupling of the patterned NiCo2O4 *** strategies for tuning EM performance and constructing devices can be extended to other EM functional materials to promote the development of electromagnetic driven devices.

关键词： Electromagnetic absorber Electromagnetic shielding NiCo2O4 nanofiber Sensor

LP-LDPC:Three-Level Parallel FPGA Architecture for Fast Prototyping of LDPC Decoder Using High-Level Synthesis

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Journal of Computer Science & Technology 2022年第6期37卷 1290-1306页

作者： Yi-Fan Zhang Lei Sun qiang cao Wuhan National Laboratory for Optoelectronics Wuhan 430074China

Low-Density Parity-heck Codes(LDPC)with excellent error-correction capabilities have been widely used in both data communication and storage fields,to construct reliable cyber-physical systems that are resilient to real-world *** prototyping field-programmable gate array(FPGA)-based decoder is essential to achieve high decoding performance while accelerating the development *** paper proposes a three-level parallel architecture,TLP-LDPC,to achieve high throughput by fully exploiting the characteristics of both LDPC and underlying hardware while effectively scaling to large-size FPGA *** three-level parallel architecture contains a low-level decoding unit,a mid-level multi-unit decoding core,and a high-level multi-core *** low-level decoding unit is a basic LDPC computation component that effectively combines the features of the LDPC algorithm and hardware with the specific structure(e.g.,Look-Up-Table,LUT)of the FPGA and eliminates potential data *** mid-level decoding core integrates the input/output and multiple decoding units in a well-balancing pipelined *** top-level multi-core architecture conveniently makes full use of board-level resources to improve the overall *** develop an LDPC C++code with dedicated pragmas and leverage HLS tools to implement the TLP-LDPC *** results show that TLP-LDPC achieves 9.63 Gbps end-to-end decoding throughput on a Xilinx Alveo U50 platform,3.9x higher than existing HLS-based FPGA implementations.

关键词： low-density parity-check(LDPC) high-level synthesis(HLS) field-programmable gate array(FPGA)

Anisotropy of Mechanical Behavior in Commercially Pure Titanium Sheets

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Journal of Harbin Institute of Technology(New Series) 2015年第1期22卷 63-67页

作者： qiang cao Qingdong Zhang Xiaofeng Zhang School of Mechanical Engineering University of Science and Technology Beijing

Commercially pure titanium( CP Ti) sheets show typical planar anisotropy due to inherently crystallographic texture and rolling process. To characterize the initial,planar,plastic anisotropy of CP Ti sheets in forming process,uniaxial tensile tests of cold-rolled TA1 sheets at 0°,45° and 90° to the rolling direction were performed at room temperature,corresponding stress-strain curves and Lankford coefficient( r value) were obtained. Based on Hill'48 and Barlat'89 yield criteria,the anisotropic behavior of TA1 sheets was investigated. In order to verify the accuracy of two models,the experimental values of yield stress and r were compared with predicted ones. It revealed that Barlat '89 criterion with M = 6 is the best agreement with experimental data,and the obtained model can be used in the simulation of forming process.

关键词： commercially pure titanium anisotropy yield criter

High Strength Silicon Carbide Foams and Their Deformation Behavior

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Journal of Materials Science & Technology 2006年第2期22卷 269-272页

作者： Chong TIAN Jinsong ZHANG Xiaoming cao qiang LIU Wanping HU Institute of Metal Research Chinese Academy of Sciences Shenyang 50016 China

Silicon carbide （SIC） foams with a continuously connected open-cell structure were prepared and characterized for their mechanical performance. The apparent densities of SiC foams were controlled between about 0.4 and 2.3 g/cm^3, with corresponding compressive strengths ranging from about 23 to 60 MPa and flexural strengths from about 8 to 30 MPa. Compressive testing of the SiC foams yielded stress-strain curves with only one linear-elastic region, which is different from those reported on ceramic foams in literature. This can possibly be attributed to the existence of filaments with fine, dense and high strength microstructures. The SiC and the filaments respond homogeneously to applied loading.

关键词： Silicon carbide foams Apparent density Strength Deformation behavior Linear-elastic behavior

Double-activated porous carbons for high-performance supercapacitor electrodes

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Rare Metals 2017年第5期36卷 449-456页

作者： Jing Sun Shu-Hua Yang Shan-Shan Li Bing-qiang cao Materials Center for Energy and Photoelectrochemical Conversion School of Material Science and EngineeringUniversity of JinanJinan 250022China

The double-activated porous carbons（DAPCs）with unique bimodal pore structure were prepared by activating commercial microporous carbon（CMCs） twice through KOH（double activation） at high temperature. The as-prepared DAPCs show larger surface area（833 m^2·g^-1）,and the pores are composed of micropores（size of-1.8 nm） and mesopores（size of -4.5 nm）. Such special hierarchical porous structures integrate the dual advantages of micropore and mesopore, having not only the high energy storage of the micropores but also the high-rate performance of the mesopores for supercapacitors（SCs）.As a result, the optimized DAPCs-3-1 exhibits a high specific capacitance of 277 F·g^-1 at 1 A·g^-1, enhanced rate performance of 197 F·g^-1 at a high current density of 10 A·g^-1, and excellent cycling stability with 94.2% capacity retention after 10,000 cycles in the 1 mol·L^-1 Na2SO4 electrolyte. The facile double activation could be a promising method to prepare suitable porous carbons with exceptional electrochemical properties for SCs.

关键词： Double activation Activated carbon Hierarchically porous carbons Supercapacitor