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Transportation Safety and Environment 2023年第4期5卷 58-66页

作者： Yunting Zheng Shaohua Chen zhiyong tan Yongkui Sun Automation and Electrical Engineering College Dalian Jiaotong UniversityDalian 116028LiaoningChina CRRC Dalian Co.Ltd. Dalian 116021LiaoningChina National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong UniversityBeijing 100044China

A new fault diagnosis method is proposed to effectively extract the fault features of the sound signal of typical faults of ZDJ9 railway point machines.A multi-entropy feature extraction method is proposed by combing multi-scale permutation entropy and wavelet packet ***,empirical mode decomposition is performed on sound signals to obtain modal components with different time ***,multi-scale permutation entropy is extracted from these ***,the wavelet packet entropy of the sound signals of these sensitive nodes is obtained by analysing the reconstructed signals of the last layer *** the multi-scale permutation entropy and the wavelet packet entropy can distinguish the subtle features of the signal,the subtle features of the information among the high-dimensional features,ReliefF is ***,a support vector machine(SVM)is used to judge the original sismal can be obtained as the feature vector of the 2DJ9 iway point mnchine in ditterent states,To reduce the redundant fault type of a ZDJ9 rilway point machine.

关键词： railway point machine fault diagnosis sound signal support vector machine(SVM)

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Symmetry-broken silicon disk array as an efficient terahertz switch working with ultra-low optical pump power

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Chinese Physics B 2020年第8期29卷 72-77页

作者： Zhanghua Han Hui Jiang zhiyong tan Juncheng Cao Yangjian Cai Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystems and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The advancement of terahertz technology in recent years and its applications in various fields lead to an urgent need for functional terahertz components,among which a terahertz switch is one example of the most importance because it provides an effective interface between terahertz signals and information in another physical *** date many types of terahertz switches have been investigated mainly in the form of metamaterials made from metallic structures and optically-active ***,these reported terahertz switches usually suffer from an inferior performance,e.g.,requiring a high pump laser power density due to a low quality factor of the metallic metamaterial *** this paper,we report and numerically investigate a symmetry-broken silicon disk based terahertz resonator array which exhibits one resonance with ultrahigh quality factor for normal incidence of the terahertz *** resonance,which can never be excited for regular circular Si disks,can help to realize a superior terahertz switch with which only an ultra-low optical pump power density is required to modify the free carrier concentration in Si and its refractive index in the terahertz *** findings demonstrate that to realize a high terahertz transmittance change from 0 to above 50%,the required optical pump power density is more than 3 orders of magnitude smaller than that required for a split-ring resonator(SRR)based terahertz switch reported in the literature.

关键词： silicon disk symmetry-broken terahertz switch photocarrier bound state in continuum

Temperature-dependence of acoustic fatigue life for thermal protection structures

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Theoretical & Applied Mechanics Letters 2014年第2期4卷 27-31页

作者： Yadong Zhou Shaoqing Wu zhiyong tan Qingguo Fei Department of Engineering Mechanics Southeast University Jiangsu Key Laboratory of Engineering Mechanics Southeast University State Key Laboratory of Space Physics

Acoustic fatigue life evaluation is essential for thermal protection struc- tures due to the severe thermo-acoustic load in service. A study on temperature- dependence of acoustic fatigue life for a C/SiC panel is presented in this paper. Effects of temperature on both the structural responses and the S-N curves are investigated. The Dirlik method is adopted to predict the fatigue life of a C/SiC panel at three different temperatures respectively. Significant differences are ob- served from the results of numerical simulations between the fatigue lives of the panel in the three cases. The temperature-dependence of acoustic fatigue life of a C/SiC panel is verified, and fatigue test of the material needs to be more atten- tively performed.

关键词： C/SiC panel S-N curve acoustic fatigue temperature-dependence

Terahertz Direct Modulation Techniques for High-speed Communication Systems

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China Communications 2021年第5期18卷 221-244页

作者： Tianchi Zhou Yaxin Zhang Bo Zhang Hongxin Zeng zhiyong tan Xilin Zhang Lan Wang Zhi Chen Juncheng Cao Kaijun Song Ziqiang Yang University of Electronic Science and Technology of China ChengduChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences865 Changning RoadShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Terahertz communication technology can provide abundant frequency resources,strong confidentiality,antijamming capability,communication tracking capability and the ability to achieve highspeed data transmissions and can serve as an important technical method for high-speed communications in the *** these terahertz communication technologies,terahertz direct modulation technology is a key means to achieve low system complexity and power *** this paper,a review and outlook of terahertz direct modulation technology are proposed from the aspects of high-electron-mobilitytransistor-based terahertz direct modulation,parallelswitch terahertz direct modulation,diode-based terahertz direct modulation,quantum cascade laser-based terahertz direct modulation and new-material-based terahertz direct *** hope through this paper that more readers can gain knowledge about the development and challenges of terahertz direct modulation technology for high-speed communication systems,thus promoting the development of high-speed terahertz communication technology based on direct modulation.

关键词： THz communication THz direct modulation HEMT switches diode QCL new-material

Identification of potential biomarkers for progression and prognosis of bladder cancer by comprehensive bioinformatics analysis

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Identification of potential biomarkers for progression and p...

A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials

2022CCTB中国肿瘤标志物学术大会暨中国整合肿瘤学大会暨第十六届肿瘤标志物青年科学家论坛暨中国肿瘤标志物产业创新大会

作者： zhiyong tan Jiansong Wang The Second Affiliated Hospital of Kunming Medical University

Background:Bladder cancer(BLCA) is a highly malignant tumor that develops in the urinary *** of biomarkers in progression and prognosis is crucial for the treatment of ***:BLCA-related differentially expressed genes(DEGs) were authenticated by screening the DEGs and weighted gene co-expression network analysis(WGCNA).LASSO and SVM-RFE algorithms were utilized to screen the feature genes in *** analysis was performed using the Kaplan-Meier curve provided by the ’survival’ R *** BLCA samples were clustered by hclust based on the immune-score matrix calculated by the single sample GSEA(ssGSEA) *** immune-,stromal-and estimate-scores of each BLCA patient were calculated by applying the ESTIMATE *** ssGSEA was conducted to explore the function of characteristic genes in *** expression of characteristic genes in clinical cancer tissue and peri-cancerous tissue of BLCA patients was verified using qRT-PCR ***:A total of 189 BLCA-related DEGs were *** feature genes were defined by LASSO and SVM-RFE *** characteristic genes,including SMYD2,GAPDHP1,ATP1A2,CILP,and THSD4,were related to the OS of *** correlation analysis of five characteristic genes and clinicopathological factors showed that five genes played a role in the progression of ***,the expression of five characteristic genes in clinical cancer tissues and pericarcinomatous tissues from BLCA patients was verified by qRT-PCR,which was consistent with the result from the public ***:Finally,we discovered five prognostic genes linked to BLCA progression,which might serve as a theoretical basis for prognosis and treatment targets for BLCA patients.

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Chinese Optics Letters 2019年第9期17卷 101-104页

作者： Xiaoqing Luo zhiyong tan Chang Wang Juncheng Cao Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We propose and experimentally demonstrate a wideband linear polarization converter in a reflection mode operating from 2.4 to 4.2 THz with conversion efficiency of more than 80%. Our device can expand the applications to a higher frequency band. A numerical simulation is performed for this metamaterial converter, which shows a good agreement with experimental results. Importantly, a concise and intuitive calculating model is proposed for the Fabry–Pérot cavity. The theoretical results indicate that the underlying reason for the enhanced polarization conversion is the additional phase difference induced by the resonance of the meta-structure and multiple reflections within the Fabry–Pérot cavity.

关键词： reflecting-type highly efficient terahertz cross-polarization converter metamaterials

The Strength Characters of C/C Composite Material with Opening Hole and Typical Application

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Journal of Materials Science and Chemical Engineering 2017年第1期5卷 61-68页

作者： zhiyong tan Changwan Min Xuyun Zhan Weili Dong Science and Tehnology on Space Physics Laboratory Beijing China

Research on the opening hole and connecting problem of C/C composite material was conducted. The strength characteristics of plate with opening hole were tested and the applicability of strength criteria focused on particular point was analyzed. Conclusion is obtained that obviously conservative to evaluate open hole and joint strength by hole-edge stress. Based on these, high and nor-mal temperature strength test of typical circular shaft was completed, proving that comprehensive joint performance can be significantly improved by appropriately optimized design.

关键词： Composite Material Opening’s Characteristics Joint Strength

Subwavelength resolved terahertz real-time imaging based on a compact and simplified system

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Chinese Optics Letters 2022年第9期20卷 14-17页

作者： zhiyong tan Wenjian Wan Chang Wang Juncheng Cao Laboratory of Terahertz Solid-state Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

A real-time imaging system based on a compact terahertz laser is constructed by employing one off-axis parabolic mirror and one silicon *** imaging of water,water stains,leaf veins,human hairs,and metal wire is *** imaging resolution of 68μm is *** experiments show that this compact and simplified imaging system is suitable for penetration demonstration of terahertz light,water distribution measurement,and imaging analysis of thin samples.

关键词： terahertz real-time imaging subwavelength resolution compact laser

Recent Technological Innovation for the New Generation of CRIST Sensors—A Practical Approach in China’s Largest Underground Nonferrous Mine

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Open Journal of Applied Sciences 2023年第8期13卷 1348-1362页

作者： Xiaoqiang Guan Haibin Li zhiyong tan Xubin Wu Wei Zhang Chinalco Research Institute of Science and Technology Co. Ltd. Beijing China Chinalco Intelligent Tongchuang Technology (Yunnan) Co. Ltd. Kunming China

Located in Shangri-La county, Yunnan Province, China’s biggest underground nonferrous mine Pulang Copper Mine is under construction. To date, the defined copper reserves at the Pulang Copper Mine are 4.8 million tonnes of copper and an average grade of 0.34%. The mineralized zone is 2300 m long, 600 - 800 m wide, and 1000 m high in a dome shape. The first-stage mining and processing capacity is 12.5 million tonnes of ore per year. By geotechnical investigation, ore haulage is adopted via a drift and ore pass development system. From mineralogical analysis, a majority of the Pulang copper ore body is classified as a type III rock, which is generally considered to be suitable for block-caving methods. As an update to the traditional mine-to-mill approach, a cave-to-mill integrated production concept is then introduced. This is essentially the integration of underground mine production scheduling and monitoring with surface mineral processing management based on fragment size and geometallurgical ore characteristics. Several unique challenges experienced during the project design and construction, as well as a number of features aimed at mitigating these problems, are also discussed in this paper.

关键词： Block Caving Cave to Mill Geometallurgy Lithology Sensors

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镁合金压铸模具的热处理工艺研究

热加工工艺 2013年第12期42卷 208-210页

作者：覃智勇广州民航职业技术学院广东广州510403

研究了不同淬火冷却方式、不同表面强化处理工艺对镁合金压铸模具的表面硬度、耐磨损性、耐高温腐蚀性和渗层深度的影响。结果表明,淬火分级冷却比普通油冷、离子氮化后再固体渗钒-稀土钇的复合强化热处理比普通离子氮化处理,均明显提... 详细信息

研究了不同淬火冷却方式、不同表面强化处理工艺对镁合金压铸模具的表面硬度、耐磨损性、耐高温腐蚀性和渗层深度的影响。结果表明,淬火分级冷却比普通油冷、离子氮化后再固体渗钒-稀土钇的复合强化热处理比普通离子氮化处理,均明显提高了模具的耐磨性和耐高温腐蚀性,在镁合金压铸模具热处理中具有较强的实用性。

关键词：压铸模具热处理分级冷却复合强化热处理镁合金