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Purity-dependent Lorenz number,electron hydrodynamics and electron-phonon coupling in WTe

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Wei xie Feng Yang liangcai Xu Xiaokang Li Zengwei Zhu Kamran Behnia Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Laboratoire de Physique et d' E'tude des Mate'riaux (ESPCI-CNRS-Sorbonne Universite') PSL University

We present a study of electrical and thermal transport in Weyl semimetal WTe2down to 0.3 K.The Wiedemann-Franz law holds below 2 K and a downward deviation starts above.The deviation is more pronounced in cleaner samples,as expected in the hydrodynamic picture of electronic transport,where a fraction of electron-electron collisions conserve momentum.Phonons are the dominant heat carriers and their mean-free-path does not display a Knudsen minimum.This is presumably a consequence of weak anharmonicity,as indicated by the temperature dependence of the specific heat.Frequent momentum exchange between phonons and electrons leads to quantum oscillations of the phononic thermal conductivity.Bloch-Gru¨neisen picture of electron-phonon scattering breaks down at low temperature when Umklapp ph-ph collisions cease to be a sink for electronic flow of momentum.Comparison with semi-metallic Sb shows that normal ph-ph collisions are amplified by anharmonicity.In both semimetals,at cryogenic temperature,e-ph collisions degrade the phononic flow of energy but not the electronic flow of momentum.

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新质生产力背景下职业教育助力绿色技能人才培养

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当代职业教育 2024年第3期 23-29页

作者：谢良才重庆师范大学重庆401331

新质生产力本身是绿色生产力,具有突出的绿色属性,新产业、新产品、新技术等实现了绿色转型发展。新质生产力发展在人力资源要素配置上需要具备绿色意识和技术技能的高素质劳动者队伍,需要良好的绿色技能人才生态,职业教育应充分利用自... 详细信息

新质生产力本身是绿色生产力,具有突出的绿色属性,新产业、新产品、新技术等实现了绿色转型发展。新质生产力发展在人力资源要素配置上需要具备绿色意识和技术技能的高素质劳动者队伍,需要良好的绿色技能人才生态,职业教育应充分利用自身优势助力其人才需求。推动新质生产力的绿色发展,在职业院校层面应从专业、课程与教学、环境、师资等诸要素加强绿色化发展,全方位推动绿色技术技能人才成长;在教育管理层面,采取促进职业教育国家教学标准充分反映生态文明建设需要,支持产教融合服务平台及产教融合型企业关注绿色技能,深入实施绿色学校创建行动,对职业院校教师开展绿色化职业教育专题培训等措施。

关键词：新质生产力职业教育绿色发展绿色技能生态文明建设

Genetic Engineering of Energy Crops: A Strategy for Biofuel Production in China

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Journal of Integrative Plant Biology 2011年第2期53卷 143-150页

作者： Guosheng xie liangcai Peng National Key Laboratory of Crop Genetic Improvement Biomass and Bioenergy Research Centre and College of Plant Sciences and Technology Huazhong Agricultural University Wuhan 430070 China College of Life Sciences and Technology Huazhong Agricultural University Wuhan 430070 China

Biomass utilization is increasingly considered as a practical way for sustainable energy supply and long-term environment care around the world. In concerns with food security in China, starch or sugar-based bioethanol and edible-oil-derived biodiesel are harshly restricted for large scale production. However, conversion of lignocellulosic residues from food crops is a potential alternative. Because of its recalcitrance, current biomass process is unacceptably expensive, but genetic breeding of energy crops is a promising solution. To meet the need, energy crops are defined with a high yield for both food and biofuel purposes. In this review, main grasses （rice, wheat, maize, sorghum and miscanthus） are evaluated for high biomass production, the principles are discussed on modification of plant cell walls that lead to efficient biomass degradation and conversion, and the related biotechnologies are proposed in terms of energy crop selection.

关键词： Biomass Energy Fuel crops Production Breeds (animals) Productivity Products Lymphocytes Crops Oesophagus

Anti-Jamming Performance of Fountain Coded Differential Frequency Hopping Systems in AWGN

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China Communications 2014年第A2期11卷 53-60页

作者： ZHU Wenjie YI Benshun GAN liangcai xie Qiuying Electronic Information School Wuhan University Wuhan Hubei 430072 Hubei Province P.R. China

Based on the anti-jamming performance of differential frequency hopping (DFH) systems in Additive White Gaussian Noise (AWGN) channel, Fountain code is introduced to the DFH systems as the outer error correcting code in this paper to investigate the improvements against partial-band jamming over AWGN channel. The performance of Fountain coded DFH is theoretically analyzed and numerically simulated. The total frequency of hopping in the simulation is 16, and results show that, on one hand, when exact jamming state information (JSI) is available, and the number of jamming frequency is n=16, the bit error rate (BER) of 10 -3 is achieved with the signal to interference ratio (SIR) approximately 7.5 dB over AWGN channel, and the performance improves about 1-1.5dB compared with the no-coded system. When the number of jamming frequency is n=2, the performance increases 15-17dB. On the other hand, when JSI is unavailable, a joint JSI estimation and decoding algorithm is proposed. The BER of 10 -3 is achieved with jamming-frequency n=16, SIR=8dB and signal noise ratio (SNR) 10dB over AWGN channel. It's proved that this algorithm provides robust anti-jamming performance even without JSI. The anti-jamming performance of Fountain coded DFH systems is obviously superior to no-coded DFH systems.

关键词： AWGN信道抗干扰性能跳频系统喷泉差分加性高斯白噪声干扰频率编码系统

Titanium-Containing Mesoporous Materials: Synthesis and Application in Selective Catalytic Oxidation

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Journal of Natural Gas Chemistry 2006年第3期15卷 164-177页

作者： Jie Li Chunhui Zhou Huali xie Zhonghua Ge liangcai Yuan Xiaonian Li College of Chemical Engineering and Materials Science Zhejiang University of Technology Hangzhou 310014 Zhejiang China

Titanium-containing mesoporous molecular sieves are of great significance in selective catalytic oxidation processes with bulky molecules. Recent researches and developments on the designing and synthesis of Ti-containing mesoporous materials have been reviewed. Various strategies for the preparation of Ti-containing mesoporous materials, such as direct synthesis and post-synthesis, are described. Modifications of Ti-containing mesoporous materials by surface-grafting and atom-planting are also discussed. All approaches aimed mainly at the improving of the stability, the hydrophobicity, and mostly the catalytic activity. Structural and mechanistic features of various synthetic systems are discussed. Ticontaining mesoporous materials in liquid phase catalytic oxidation of organic compounds with H2O2 as an oxidant is briefly summarized, showing their broad utilities for green synthesis of fine chemicals by catalytic oxidative reactions.

关键词： mesoporous materials titanium molecular sieve zeolites characterization catalytic oxidation

Diffractive optical elements 75 years on:from micro-optics to metasurfaces

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Photonics Insights 2023年第4期2卷 43-101页

作者： Qiang Zhang Zehao He Zhenwei xie Qiaofeng Tan Yunlong Sheng Guofan Jin liangcai Cao Xiaocong Yuan Nanophotonics Research Center Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhenChina Department of Precision Instruments Tsinghua UniversityBeijingChina Center for Optics Photonics and LasersLaval UniversityQuebecCanada Research Institute of Intelligent Sensing Research Center for Humanoid SensingZhejiang LabHangzhouChina

Diffractive optical elements(DOEs)are intricately designed devices with the purpose of manipulating light fields by precisely modifying their wavefronts.The concept of DOEs has its origins dating back to 1948 when D.Gabor first introduced holography.Subsequently,researchers introduced binary optical elements(BOEs),including computer-generated holograms(CGHs),as a distinct category within the realm of DOEs.This was the first revolution in optical devices.The next major breakthrough in light field manipulation occurred during the early 21st century,marked by the advent of metamaterials and metasurfaces.Metasurfaces are particularly appealing due to their ultra-thin,ultra-compact properties and their capacity to exert precise control over virtually every aspect of light fields,including amplitude,phase,polarization,wavelength/frequency,angular momentum,etc.The advancement of light field manipulation with micro/nano-structures has also enabled various applications in fields such as information acquisition,transmission,storage,processing,and display.In this review,we cover the fundamental science,cutting-edge technologies,and wide-ranging applications associated with micro/nano-scale optical devices for regulating light fields.We also delve into the prevailing challenges in the pursuit of developing viable technology for real-world applications.Furthermore,we offer insights into potential future research trends and directions within the realm of light field manipulation.

关键词： diffractive optical elements metasurfaces metamaterials

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斯里兰卡国家职业资格框架制度研究

职教论坛 2023年第11期39卷 112-120页

作者：谢良才高松重庆师范大学职教师资学院重庆师范大学重庆市职业教育协同创新中心伊犁师范大学教育科学学院

基于斯里兰卡国家职业资格框架最新政策文本的解读,研究发现其职业资格级别划分、认证和证书授予为学习者提供了明确的职业资格提升路径。斯里兰卡国家职业资格框架的运行注重使申请人获得职业资格后能胜任相关职业工作,在严格制定的国... 详细信息

基于斯里兰卡国家职业资格框架最新政策文本的解读,研究发现其职业资格级别划分、认证和证书授予为学习者提供了明确的职业资格提升路径。斯里兰卡国家职业资格框架的运行注重使申请人获得职业资格后能胜任相关职业工作,在严格制定的国家能力标准基础上开发职业教育课程,以及进行能力本位的职业资格评估。鉴于斯里兰卡的特定国情以及基于国家职业资格框架制度的职业教育实践特点,“一带一路”背景下的中斯职业教育交流合作增长点包括帮助其完善职业资格框架制度,发展高质量的职业教育,在职业教育中加强爱国教育以及践行现代化新发展理念等。

关键词：斯里兰卡国家职业资格框架职业资格证书职业教育

论职业教育在我国经济社会绿色发展中的功能定位及改革举措

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职教通讯 2022年第5期 60-67页

作者：谢良才南海重庆师范大学职教师资学院重庆师范大学重庆市职业教育协同创新中心重庆师范大学重庆市人民政府重庆师范大学重庆市职业教育监测评估与师资培养协同创新中心

经济社会的绿色发展对公民的素质和职业能力提出了愈来愈高的绿色要求,职业教育的绿色发展已成为必然趋势。为适应新的社会需求,当前职业教育急需转变功能定位,改革教育教学实践。在功能定位的调整方面,职业教育应注重传承生态文化,突... 详细信息

经济社会的绿色发展对公民的素质和职业能力提出了愈来愈高的绿色要求,职业教育的绿色发展已成为必然趋势。为适应新的社会需求,当前职业教育急需转变功能定位,改革教育教学实践。在功能定位的调整方面,职业教育应注重传承生态文化,突出培养绿色技能人才,开展绿色社会服务。为此,职业教育应主动适应我国经济社会的绿色发展需求;与绿色职业标准和绿色生产过程对接形成成熟的绿色技能人才培养体系;从宏观上优化整合教育资源,实现职业教育体系的绿色化。

关键词：职业教育经济社会绿色发展绿色技能人才功能定位

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论职业教育结果公平与职业教育的吸引力

中国高教研究 2016年第4期 105-110页

作者：谢良才北京师范大学教育学部职业与成人教育研究所博士研究生北京100875

职业教育结果公平性主要体现在结果形式、素质提升、生涯发展三个方面。在结果形式上,毕业生"双证书"的获得情况在职业院校之间差异不大,相比普通院校,其对职教吸引力的影响,取决于证书的实际含金量;在素质提升上,职业教育在不同地区、... 详细信息

职业教育结果公平性主要体现在结果形式、素质提升、生涯发展三个方面。在结果形式上,毕业生"双证书"的获得情况在职业院校之间差异不大,相比普通院校,其对职教吸引力的影响,取决于证书的实际含金量;在素质提升上,职业教育在不同地区、不同学校和专业因办学投入、教育质量差异等原因均存在不公平,与普通教育相比差异较大,但具公平性,使得职业教育对特定类型的生源具有较强的吸引力;在就业方面,职业教育不同专业之间有不公平现象,与普通院校相比则因劳动力市场的特性也有不公平的一面,但有日趋好转的倾向,对职业教育吸引力的负面影响在降低;在升学深造方面,传统教育制度安排使职教毕业生面临着明显的不平等,现代教育体系的落实则有利于降低这种不平等,提升职业教育的吸引力。通过改善职业教育的结果公平性,能够直接提升职业教育的吸引力。

关键词：职业教育结果公平职业教育吸引力职业资格证书就业升学