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Layered metastructure containing freely-designed local resonators for wave attenuation

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Defence Technology（防务技术） 2024年第2期32卷 23-31页

作者： yu Li Huguang He Jiang Feng Hailong Chen Fengnian Jin Hualin Fan State Key Laboratory for Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing 210007China Rocket Force University of Engineering Xi'an 710025China Henan International Joint Laboratory of Dynamics of Impact and Disaster of Engineering Structures Department of Civil EngineeringNanyang Institute of TechnologyNanyang 473004China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety and Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China Research Center of Lightweight Structures and Intelligent Manufacturing State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China

Combining periodic layered structure with three-dimensional cylindrical local resonators,a hybrid metastructure with improved wave isolation ability was designed and investigated through theoretical and numerical *** metastructure is composed of periodic rubber layers and concrete layers embedded with three-dimensional resonators,which can be freely designed with multi local resonant frequencies to attenuate vibrations at required frequencies and widen the attenuation *** metastructure can also effectively attenuate seismic *** with layered rubber-based structures,the metastructure has more excellent wave attenuation effects with greater attenuation and wider bandgap.

关键词： Layered metastructure Local resonator Wave attenuation

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农村典型固体燃料燃烧热动力学特性研究

制冷与空调（四川） 2022年第6期36卷 863-869页

作者：章鹏鑫邓梦思马荣江余南阳西南交通大学机械工程学院成都610031

固体燃料是农村最主要的能源之一,为研究农村地区典型固体燃料的燃烧特性,选取包含木头、玉米秸秆、木质颗粒和玉米秸秆颗粒在内的四种生物质燃料和包含烟煤块、烟煤煤球、兰炭和兰炭蜂窝煤在内的四种煤炭燃料进行热动力学分析。结果表... 详细信息

固体燃料是农村最主要的能源之一,为研究农村地区典型固体燃料的燃烧特性,选取包含木头、玉米秸秆、木质颗粒和玉米秸秆颗粒在内的四种生物质燃料和包含烟煤块、烟煤煤球、兰炭和兰炭蜂窝煤在内的四种煤炭燃料进行热动力学分析。结果表明:八种燃料主要失重过程均发生在挥发分析出燃烧阶段和焦炭燃烧阶段;生物质燃料在挥发分析出燃烧阶段的活化能大于焦炭燃烧阶段的活化能而煤炭燃料则相反。研究结果可为农村地区固体燃料加工技术和清洁炉具设计提供理论指导。

关键词：农村地区生物质煤炭热重分析热动力学特性

Electron push-pull effects induced performance promotion in covalent organic polymer thin films-based memristor for neuromorphic application

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Chinese Chemical Letters 2024年第5期35卷 227-231页

作者： Panke Zhou Hong yu Mun Yin Chee Tao Zeng Tianli Jin Hongling yu Shuo Wu Wen Siang Lew Xiong Chen State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

Covalent organic polymer(COP)thin film-based memristors have generated intensive research interest,but the studies are still in their ***,by controlling the content of hydroxyl groups in the aldehyde monomer,Py-COP thin films with different electronic push-pull effects were fabricated bearing distinct memory performances,where the films were prepared by the solid-liquid interface method on the ITO substrates and further fabricated as memory devices with ITO/Py-COPs/Ag *** Py-COP-1-based memory device only exhibited binary memory behavior with an ON/OFF ratio of 1:10^(1.87).In contrast,the device based on Py-COP-2 demonstrated ternary memory behavior with an ON/OFF ratio of 1:10^(0.6):10^(3.1) and a ternary yield of 55%.The ternary memory mechanism of the ITO/Py-COP-2/Ag memory device is most likely due to the combination of the trapping of charge carriers and conductive ***,the Py-COPs-based devices can successfully emulate the synaptic potentiation/depression behavior,clarifying the programmability of these devices in neuromorphic *** results suggest that the electronic properties of COPs can be precisely tuned at the molecular level,which provides a promising route for designing multi-level memory devices.

关键词： Covalent organic polymers Push-pull effects Multi-level memory Memristor

Advancements in machine learning for material design and process optimization in the field of additive manufacturing

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China Foundry 2024年第2期21卷 101-115页

作者： Hao-ran Zhou Hao Yang Huai-qian Li Ying-chun Ma Sen yu Jian shi Jing-chang Cheng Peng Gao Bo yu Zhi-quan Miao Yan-peng Wei National Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory of Space Physics Beijing 100076China School of Materials Science and Engineering Nanyang Technological University639798Singapore

Additive manufacturing technology is highly regarded due to its advantages,such as high precision and the ability to address complex geometric ***,the development of additive manufacturing process is constrained by issues like unclear fundamental principles,complex experimental cycles,and high *** learning,as a novel artificial intelligence technology,has the potential to deeply engage in the development of additive manufacturing process,assisting engineers in learning and developing new *** paper provides a comprehensive overview of the research and applications of machine learning in the field of additive manufacturing,particularly in model design and process ***,it introduces the background and significance of machine learning-assisted design in additive manufacturing *** then further delves into the application of machine learning in additive manufacturing,focusing on model design and process ***,it concludes by summarizing and forecasting the development trends of machine learning technology in the field of additive manufacturing.

关键词： additive manufacturing machine learning material design process optimization intersection of disciplines embedded machine learning

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成都市办公建筑能耗调查与分析

制冷与空调（四川） 2009年第3期23卷 94-98页

作者：孙立戎向阳余南阳文韬闵晓丹西南交通大学成都610031 中国建筑西南设计研究院 610081

对成都市办公建筑进行了能耗调查,调查时间为2008年5月至2008年8月得到该类建筑的能耗情况;调查结果显示,成都市办公楼平均单位面积耗电量为56.2kWh/(m2·a),人均年耗水量为59.3t/(人·a),单位面积耗气量为5.01m3/(m2·a)。

关键词：能耗调查空调系统节能办公建筑

Full-parameter omnidirectional transformation optical devices

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National Science Review 2024年第3期11卷 92-99页

作者： yuan Gao yu Luo Jingjing Zhang Zhengjie Huang Bin Zheng Hongsheng Chen Dexin Ye Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang University School of Electrical and Electronic Engineering Nanyang Technological University CNRS-InternationalNTU-Thales Research Alliance Nanyang Technological University Institute of Electromagnetic Space Southeast University State Key Laboratory of Millimeter Waves Southeast University International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang University Shaoxing Institute of Zhejiang University Zhejiang University

Transformation optics(TO) provides an unprecedented technique to control electromagnetic(EM) waves by engineering the constitutive parameters of the surrounding medium through a proper spatial transformation. In general, ideal transformation optical devices require simultaneous electric and magnetic responses along all three dimensions. To ease the practical implementation, previous studies usually made use of reduced parameters or other simplified approaches, which inevitably introduce extra reflection or unwanted phase shift. Up to today, experimental realizations of full-parameter transformation optical devices in free space are still quite limited. Here, a general design strategy is proposed to solve this *** a specific example, a full-parameter spatial-compression TO medium with constitutive parameters taking the diagonal form diag(a, a, 1/a) for the TM wave incidence was designed and realized experimentally. Such spatial-compression TO media were then applied to the implementation of an ideal omnidirectional invisibility cloak capable of concealing a large-scale object over a wide range of illumination angles. Both the simulation and experiment confirm that the cloak allows for nearly unity transmission of EM waves in the forward direction without introducing extra scattering or phase shift. This work constitutes an important stepping stone for future practical implementation of arbitrary full-parameter omnidirectional transformation optical devices.

关键词： transformation optical devices omnidirectional impedance matching full-parameter invisibility cloak

Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng Li Ming-Wei Zhang Ji-Wu Xin Lei Wei Wen-yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

中韩绿色建筑评价对比分析(2):GBCC 2011与ESGB 2014

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制冷与空调（四川） 2015年第1期29卷 26-33页

作者：邓高峰袁艳平王权汪鹏余南阳中国建筑科学研究院北京100013 西南交通大学成都610031

随着我国社会经济的发展,《绿色建筑评价标准》GB/T50378-2006逐渐暴露出了许多不足。于2014年4月,住房城乡建设部发布新公告,批准《绿色建筑评价标准》GB/T50378-2014为新的国家标准,该标准的发布是对绿色建筑评价标准的进一步完善。目... 详细信息

随着我国社会经济的发展,《绿色建筑评价标准》GB/T50378-2006逐渐暴露出了许多不足。于2014年4月,住房城乡建设部发布新公告,批准《绿色建筑评价标准》GB/T50378-2014为新的国家标准,该标准的发布是对绿色建筑评价标准的进一步完善。目前,韩国最新的《绿色建筑评价标准》于2011年颁布,该标准仍在施行。通过对2011年韩国颁布的《绿色建筑评价标准》和我国最新的《绿色建筑评价标准》的对比,从评价对象、指标体系、评分点及评分方式、指标权重四个方面分析探讨了我国绿色建筑评价标准的优点和不足之处,旨在为我国绿色建筑评价体系的进一步完善提供参考。

关键词：绿色建筑评价认证体系评价指标对比

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坡度隧道火灾自然排烟特性研究

制冷与空调（四川） 2022年第5期36卷 681-687页

作者：屈昊聿袁中原余南阳徐梦一马洋阳西南交通大学机械工程学院成都610031

通过模型试验,研究了坡度隧道火灾自然排烟特性,试验结果表明:(1)受坡度影响,火羽流向上坡侧发生偏转,且偏转角几乎不受火源位置与HRR的影响,只随坡度的升高而线性增大;(2)顶壁下方最高烟气温度随坡度的升高而降低,基于理论分析和模型... 详细信息

通过模型试验,研究了坡度隧道火灾自然排烟特性,试验结果表明:(1)受坡度影响,火羽流向上坡侧发生偏转,且偏转角几乎不受火源位置与HRR的影响,只随坡度的升高而线性增大;(2)顶壁下方最高烟气温度随坡度的升高而降低,基于理论分析和模型试验结果,得到了顶壁下方最高烟气温度的计算模型;(3)火源上坡侧的顶壁下方烟气温度受坡度变化的影响较小,下坡侧的顶壁下方烟气温度随坡度的降低而升高,并在坡度降为0时与上坡侧烟气温度关于火源对称分布,结合理论分析,得出了火源段顶壁下方烟气温度的衰减模型。

关键词：隧道火灾自然通风坡度隧道烟气特性