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Flexible Nanocomposite Conductors for Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第10期15卷 210-259页

作者： Ze Nan Wei Wei Zhenhua lin Jingjing Chang yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071People’s Republic of China

With the extensive use of electronic communication technology in integrated circuit systems and wearable devices, electromagnetic interference(EMI) has increased dramatically. The shortcomings of conventional rigid EMI shielding materials include high brittleness, poor comfort, and unsuitability for conforming and deformable applications. Hitherto, flexible(particularly elastic) nanocomposites have attracted enormous interest due to their excellent deformability. However, the current flexible shielding nanocomposites present low mechanical stability and resilience, relatively poor EMI shielding performance, and limited multifunctionality. Herein, the advances in low-dimensional EMI shielding nanomaterials-based elastomers are outlined and a selection of the most remarkable examples is discussed. And the corresponding modification strategies and deformability performance are summarized. Finally, expectations for this quickly increasing sector are discussed, as well as future challenges.

关键词： Electromagnetic interference shielding Intrinsically stretchable nanocomposites Compressible monolith Low-dimensional materials Flexible devices

A 220 GHz Orthogonal Modulator Based on Subharmonic Mixers Using Anti-Paralleled Schottky Diodes

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Chinese Journal of Electronics 2022年第3期31卷 562-568页

作者： HE yue LIU Ge LIU Juan lin Changxing SU Wei Microsystem and Terahertz Research Center China Academy of Engineering Physics Institute of Electronic Engineering China Academy of Engineering Physics

In this paper, A 220 GHz orthogonal modulator based on two symmetrical subharmonic mixers is designed, analyzed and measured, where the mixers are implemented basde on antiparallel Schottky *** orthogonal modulator consists of a 90° phase shifted220 GHz 3 d B coupler, two sub-harmonically pumped mixers and an in-phase 110 GHz 3 d B power divider. The IF output signals are in-phase(I) branch and quadrature(Q) branch operating from DC±3.5 GHz. In the back to back experimentaltests, it is shown that the conversion loss of the two 220 GHz I/Q mixers is less than 30 d B when the IF operating frequency is DC-3.5 GHz, IF input power is-10 d Bm and the LO power is around 6 m W. Based on floating-point simulation, the amplitude and phase imbalance of the I/Q mixer are less than 0.2 d B and 2 degree respectively. When the 220 GHz modulator and demodulator are set in a back to back configuration, a signal-to-noise ratio of 21 d B can be obtained using the 16 QAM modulation type.

关键词： subharmonic mixers amplitude imbalance I-Q mixer floating-point simulation power dividers millimetre wave mixers millimetre wave diodes waveguide couplers quadrature amplitude modulation Schottky diode mixers radio-over-fibre phase imbalance orthogonal modulator power divider 16 QAM modulation subharmonically pumped mixers quadrature branch in-phase branch antiparalleled Schottky diodes waveguide coupler

Optimizing Big Data Retrieval and Job Scheduling Using Deep Learning Approaches

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 783-815页

作者： Bao Rong Chang Hsiu-Fen tsai Yu-Chieh lin Department of Computer Science and Information Engineering National University of KaohsiungKaohsiungTaiwan Department of Fragrance and Cosmetic Science Kaohsiung Medical UniversityKaohsiungTaiwan

Big data analytics in business intelligence do not provide effective data retrieval methods and job scheduling that will cause execution inefficiency and low system *** paper aims to enhance the capability of data retrieval and job scheduling to speed up the operation of big data analytics to overcome inefficiency and low throughput ***,integrating stacked sparse autoencoder and Elasticsearch indexing explored fast data searching and distributed indexing,which reduces the search scope of the database and dramatically speeds up data ***,exploiting a deep neural network to predict the approximate execution time of a job gives prioritized job scheduling based on the shortest job first,which reduces the average waiting time of job *** a result,the proposed data retrieval approach outperforms the previous method using a deep autoencoder and Solr indexing,significantly improving the speed of data retrieval up to 53%and increasing system throughput by 53%.On the other hand,the proposed job scheduling algorithmdefeats both first-in-first-out andmemory-sensitive heterogeneous early finish time scheduling algorithms,effectively shortening the average waiting time up to 5%and average weighted turnaround time by 19%,respectively.

关键词： Stacked sparse autoencoder Elasticsearch distributed indexing data retrieval deep neural network job scheduling

Rational design and energy catalytic application of high-loading single-atom catalysts

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Rare Metals 2024年第10期43卷 4844-4866页

作者： Zi-Wei Deng yue Liu Jie lin Wen-Xing Chen Energy and Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Ningbo Institute of Materials Technology and Engineering Chinese Academy of ScienceNingbo 315201China

It is well known that single-atom catalysts(SACs)have become a hot topic in the field of catalysis due to their advantages such as 100%metal atom utilization efficiency,high catalytic activity and selectivity compared with conventional catalysts and ***,the isolated metal atoms on SACs have thermodynamic instability and tend to agglomerate,which limit their catalytic ***,it is of great significance to synthesize stable and high-loading single-atom catalysts(HLSACs).In this paper,we review the research progress of HLSACs from two aspects:design and ***,we comprehensively introduce the synthesis strategies of HLSACs,namely,top-down and bottom-up ***,we overview the application status of HLSACs in three fields:electrocatalysis,thermal catalysis and ***,we summarize the development prospects and challenges of HLSACs.

关键词： High-loading single-atom catalysts Design Electrocatalysis Thermal catalysis Photocatalysis

Hybrid pedestrian positioning system using wearable inertial sensors and ultrasonic ranging

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Defence Technology（防务技术） 2024年第3期33卷 327-338页

作者： lin Qi Yu Liu Chuanshun Gao Tao Feng yue Yu School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong 999077China

Pedestrian positioning system(PPS)using wearable inertial sensors has wide applications towards various emerging fields such as smart healthcare,emergency rescue,soldier positioning,*** performance of traditional PPS is limited by the cumulative error of inertial sensors,complex motion modes of pedestrians,and the low robustness of the multi-sensor collaboration *** paper presents a hybrid pedestrian positioning system using the combination of wearable inertial sensors and ultrasonic ranging(H-PPS).A robust two nodes integration structure is developed to adaptively combine the motion data acquired from the single waist-mounted and foot-mounted node,and enhanced by a novel ellipsoid constraint *** addition,a deep-learning-based walking speed estimator is proposed by considering all the motion features provided by different nodes,which effectively reduces the cumulative error originating from inertial ***,a comprehensive data and model dual-driven model is presented to effectively combine the motion data provided by different sensor nodes and walking speed estimator,and multi-level constraints are extracted to further improve the performance of the overall *** results indicate that the proposed H-PPS significantly improves the performance of the single PPS and outperforms existing algorithms in accuracy index under complex indoor scenarios.

关键词： Pedestrian positioning system Wearable inertial sensors Ultrasonic ranging Deep-learning Data and model dual-driven

Interaction between impurity nitrogen and tungsten:a first-principles investigation

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Chinese Physics B 2012年第1期21卷 346-351页

作者： Liu yue-lin Jin Shuo Zhang Ying Department of Physics Yantai UniversityYantai 264005China Department of Physics Beijing University of Aeronautics and AstronauticsBeijing 100191China

We investigate the stability, diffusion, and impurity concentration of nitrogen in intrinsic tungsten single crystal employing a first-principles method, and find that a single nitrogen atom is energetically favourable for sitting at the octahedral interstitial site. A nitrogen atom prefers to diffuse between the two nearest neighboring octahedral interstitial sites with a diffusion barrier of 0.72 eV. The diffusion coefficient is determined as a function of temperature and expressed a.s D（N） = 1.66 ~ 10-7 exp（-O.72/kT）. The solubility of nitrogen is estimated in intrinsic tungsten in terms of Sieverts＇ law. The concentration of the nitrogen impurity is found to be 4.82 ~ 10-16 /~ 3 at a temperature of 600 K and a pressure of 1 Pa. A single nitrogen atom can easily sit in an off-vacancy-centre position close to the octahedral interstitial site. There exists a strong attraction between nitrogen and a vacancy with a large binding energy of 1.40 eV. We believe that these results can provide a good reference for the understanding of the behaviour of nitrogen in intrinsic tungsten.

关键词： tungsten nitrogen diffusion first-principles

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从领域到属性:亲环境行为测量的问题及建议

心理科学进展 2025年第1期33卷 163-175页

作者：张玥董艺佳蒋奖华北电力大学经济与管理学院北京102206 香港城市大学社会与行为科学系香港北京师范大学心理学部应用实验心理北京市重点实验室心理学国家级实验教学示范中心(北京师范大学)北京100875

已有研究开发了大量的亲环境行为测量工具,涉及量表、个体行为范式和群体博弈范式,其中大多数测量工具是基于行为领域设计,节约、出行、垃圾处理、消费和公域行为是5个最常被提及的领域。现有依据行为领域的亲环境行为测量方式存在标准... 详细信息

已有研究开发了大量的亲环境行为测量工具,涉及量表、个体行为范式和群体博弈范式,其中大多数测量工具是基于行为领域设计,节约、出行、垃圾处理、消费和公域行为是5个最常被提及的领域。现有依据行为领域的亲环境行为测量方式存在标准化程度低及测量结果推广性受限的问题,这主要是由于缺少对行为属性这一行为决定性特征的关注。未来研究应基于行为属性选用和开发标准化测量工具,并选取多种真实行为作为效标进行效度检验。

关键词：亲环境行为行为领域行为属性测量

A modeling method of algorithm-hardware based on SysML

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International Journal of Modeling, Simulation, and Scientific Computing 2022年第3期13卷 74-97页

作者： Liu yue Zhao Chun Zhang lin Computer School Beijing Information Science and Technology UniversityBeijing 100101P.R.China School of Automation Science and Electrical Engineering Beihang University Beijing 100191P.R.China

In the process of complex product design,modeling in different fields and different disciplines is often *** often face many different development kits,platforms,and theories,among which significant differences *** in the process of algorithm-hardware implementation,it is necessary to have mastery of the knowledge including algorithm,hardware,circuit,and system *** this paper,a modeling method of algorithm-hardware based on SysML is proposed to reduce the difficulty of algorithm-hardware *** using the method,the designers who do not know the knowledge of hardware can also easily build the algorithm-hardware *** this method,a method of graphical system modeling based on SysML is used,where the elements of the algorithm-hardware model are described by SysML graphical ***,the SysML graphical models are converted to Very-High-Speed Integrated Circuit Hardware Description *** last,a detecting algorithm of random number is complemented by the modeling method in this paper and the simulation results are presented at the conclusion.

关键词： SysML VHDL FPGA MDA

High-order rational solutions and resonance solutions for a (3+1)-dimensional Kudryashov–Sinelshchikov equation

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Chinese Physics B 2021年第1期30卷 134-141页

作者： Yun-Fei yue Jin lin Yong Chen School of Mathematical Sciences Shanghai Key Laboratory of PMMPShanghai Key Laboratory of Trustworthy ComputingEast China Normal UniversityShanghai 200062China Department of Physics Zhejiang Normal UniversityJinhua 321004China College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China

We mainly investigate the rational solutions and N-wave resonance solutions for the(3+1)-dimensional Kudryashov–Sinelshchikov equation, which could be used to describe the liquid containing gas bubbles. With appropriate transformations, two kinds of bilinear forms are derived. Employing the two bilinear equations, dynamical behaviors of nine district solutions for this equation are discussed in detail, including bright rogue wave-type solution, dark rogue wave-type solution, bright W-shaped solution, dark W-shaped rational solution, generalized rational solution and bright-fusion, darkfusion, bright-fission, and dark-fission resonance solutions. In addition, the generalized rational solutions, which depending on two arbitrary parameters, have an interesting structure: splitting from two peaks into three peaks.

关键词： rational solution N-wave resonance solution Hirota bilinear method Kudryashov–Sinelshchikov equation