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Experimental Study of Hygrothermal and Ultraviolet Aging on the Flexural Performance of Epoxy Polymer Mortar

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Acta Mechanica Solida Sinica 2021年第4期34卷 539-549页

作者： Xinhua Li Dongpeng Ma Zhaoming Lu Yiping Liu Zhenyu Jiang Liqun Tang Zejia Liu licheng zhou School of Civil Engineering and Transportation State Key Laboratory of Subtropical Building ScienceSouth China University of TechnologyGuangzhou510640China

This paper studies the effects of hygrothermal environment at different temperatures and ultraviolet(UV)radiation on the bending properties of epoxy polymer mortar(EPM).The microstructure changes of EPM during aging were studied by scanning electron microscopy,and the bending properties of EPM were predicted by the Arrhenius *** results showed that the bending properties of EPM were greatly affected by the temperature in the hygrothermal aging,but not evidently affected by ultraviolet radiation in UV *** prediction of Arrhenius model shows that the EPM will steadily retain 92.8%,89.1%and 79.4%of the original flexural strength after long-term hygrothermal aging at 40∘C,60∘C and 80∘C,respectively.

关键词： Epoxy polymer mortar Ultraviolet radiation Hygrothermal environment Accelerated aging Flexural strength Arrhenius law

Enhanced flexural performance of epoxy polymer concrete with short natural fibers

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Science China(Technological Sciences) 2018年第8期61卷 1107-1113页

作者： HU Bin ZHANG NanLi LIAO YuTian PAN ZhiWei LIU YiPing zhou licheng LIU ZeJia JIANG ZhenYu School of Civil Engineering and Transportation State Key Laboratory of Subtropical Building Science South China University of Technology The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

Epoxy polymer concrete(EPC) has found various applications in civil engineering. To enhance the flexural performance of EPC,two kinds of short natural fibers with high specific strength(sisal fibers and ramie fibers) have been incorporated into EPC. The results of mechanical tests show that a small loading of natural fibers(0.36 vol%) can significantly increase the flexural strength of EPC by 25.3%(ramie fibers) or 10.4%(sisal fibers). This enhancement is achieved without any sacrifice of compressive strength of EPC. The reinforcing effects of short natural fibers on the flexural properties and compressive properties of EPC decrease with further increase in fiber content, due to the insufficient wetting of fibers by epoxy resin which results in poor interfacial bonding. The reinforcing mechanisms of short natural fibers are explored according to the observation of fracture surfaces and micromechanical modelling. It is found that the parallel model based on the rule of mixture can be a good approximation to describe the improvement in flexural strength of the short natural fiber reinforced EPC at low fiber volume fractions.

关键词： epoxy polymer concrete (EPC) natural fibers fiexural strength micromechanics models

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Heterogeneous parallel computing accelerated iterative subpixel digital image correlation

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Science China(Technological Sciences) 2018年第1期61卷 74-85页

作者： HUANG JianWen ZHANG LingQi JIANG ZhenYu DONG ShouBin CHEN Wei LIU YiPing LIU ZeJia zhou licheng TANG LiQun State Key Laboratory of Subtropical Building Science School of Civil Engineering and Transportation South China University of Technology School of Computer Science South China University of Technology The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

Parallel computing techniques have been introduced into digital image correlation(DIC) in recent years and leads to a surge in computation speed. The graphics processing unit(GPU)-based parallel computing demonstrated a surprising effect on accelerating the iterative subpixel DIC, compared with CPU-based parallel computing. In this paper, the performances of the two kinds of parallel computing techniques are compared for the previously proposed path-independent DIC method, in which the initial guess for the inverse compositional Gauss-Newton(IC-GN) algorithm at each point of interest(POI) is estimated through the fast Fourier transform-based cross-correlation(FFT-CC) algorithm. Based on the performance evaluation, a heterogeneous parallel computing(HPC) model is proposed with hybrid mode of parallelisms in order to combine the computing power of GPU and multicore CPU. A scheme of trial computation test is developed to optimize the configuration of the HPC model on a specific computer. The proposed HPC model shows excellent performance on a middle-end desktop computer for real-time subpixel DIC with high resolution of more than 10000 POIs per frame.

关键词： digital image correlation(DIC) inverse compositional Gauss-Newton(IC-GN) algorithm heterogeneous parallel computing graphics processing unit(GPU) multicore CPU real-time DIC

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MoS2 Nanosheets Sensitized with Quantum Dots for Room-Temperature Gas Sensors

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Nano-Micro Letters 2020年第5期12卷 20-32页

作者： Jingyao Liu Zhixiang Hu Yuzhu Zhang HuaYao Li Naibo Gao Zhilai Tian licheng zhou Baohui Zhang Jiang Tang Jianbing Zhang Fei Yi Huan Liu School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology1037 Luoyu RoadWuhan 430074People’s Republic of China

The Internet of things for environment monitoring requires high performance with low power-consumption gas sensors which could be easily integrated into large-scale sensor *** semiconductor gas sensors have many advantages such as excellent sensitivity and low cost,their application is limited by their high operating ***-dimensional(2D)layered materials,typically molybdenum disulfide(MoS2)nanosheets,are emerging as promising gas-sensing materials candidates owing to their abundant edge sites and high in-plane carrier *** work aims to overcome the sluggish and weak response as well as incomplete recovery of MoS2 gas sensors at room temperature by sensitizing MoS2 nanosheets with PbS quantum dots(QDs).The huge amount of surface dangling bonds of QDs enables them to be ideal receptors for gas *** sensitized MoS2 gas sensor exhibited fast and recoverable response when operated at room temperature,and the limit of NO2 detection was estimated to be 94 *** strategy of sensitizing 2D nanosheets with sensitive QD receptors may enhance receptor and transducer functions as well as the utility factor that determine the sensor performance,offering a powerful new degree of freedom to the surface and interface engineering of semiconductor gas sensors.

关键词： Gas sensor Room temperature Molybdenum disulfide Quantum dot Nitrogen dioxide

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Integrated sensor based on acoustics-electricity-mechanics coupling effect for wireless passive gas detection

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Nano Research 2023年第2期16卷 3130-3141页

作者： licheng zhou Bohui Zhai Zhixiang Hu Mingqi Zhang Long Li Xiangxin Wang Guangzu Zhang Jingting Luo Honglang Li Bingbing Chen Shenglin Jiang Hua-Yao Li Huan Liu School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsOptics Valley LaboratoryHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen Virtual University ParkShenzhen 518000China Key Laboratory of Optoelectronic Devices and Systems College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China School of Energy Science and Engineering Nanjing Tech UniversityNanjing 211816China

Integrated sensor combines multiple sensor functions into a single unit,which has the advantages of miniaturization and better application ***,limited by the sensing platforms of the sensor and the selectivity of the sensitive film,there are still challenges to realize multi-component gas detection in one ***,a principle integration method is proposed to achieve the multi-component gas detection based on the acoustics-electricity-mechanics coupling *** electrical and mechanical properties of the Bi_(2)S_(3)nanobelts materials in different atmospheres indicate the possibility of realizing the principle *** the same time,the surface acoustic wave(SAW)sensor as a multivariable physical transducer can sense both electrical and mechanical *** exposure to 10 ppm NO_(2),NH_(3),and their mixtures,the integrated SAW gas sensor shows a 4.5 kHz positive frequency shift(acoustoelectric effect),an 11 kHz negative frequency shift(mechanics effects),and a reduced 4 kHz negative frequency shift(acoustics-electricity-mechanics coupling effect),***,we realize wireless passive detection of NO_(2)and NH_(3)based on the SAW *** work provides valuable insights that can serve as a guide to the design and fabrication of single sensors offering multi-component gas detection via different gas sensing mechanisms.

关键词： integrated gas sensor bismuth sulfide surface acoustic wave coupling effect wireless passive

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蒋介石下令枪毙的大贪官刘乃沂

档案春秋 2007年第4期 55-60页

作者：周利成天津市档案局

1947年1月,蒋介石亲自下令:在北平将一个国民党海军上校执行枪决,一时之间轰动全国,他就是当时天津的接收大员刘乃沂。更令人瞠目的是,此案始终都与一个女人有关。

关键词：北平行辕吴新天津议员蒋介石金红黄哲

“思想是颤动于狱中”——1920年周恩来在津被捕的日子

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档案春秋 2007年第3期 36-39页

作者：周利成天津市档案馆

“五四”运动爆发后,天津爱国青年学生迅速响应,从1919年5月5日开始,南开大学、北洋大学等学校的学生纷纷走出校门,集会演讲,游行示威,声援北京学生的正义斗争,22岁的周恩来一从日本回国就立即投入了这场轰轰烈烈的斗争。15日,天津学生... 详细信息

“五四”运动爆发后,天津爱国青年学生迅速响应,从1919年5月5日开始,南开大学、北洋大学等学校的学生纷纷走出校门,集会演讲,游行示威,声援北京学生的正义斗争,22岁的周恩来一从日本回国就立即投入了这场轰轰烈烈的斗争。15日,天津学生联合会正式成立,领导全市学生开展了一系列反帝爱国运动,周恩来担任《天津学生联合会报》主编。11月16日,日本帝国主义公然制造了“福州惨案”后,天津再次掀起反对日本帝国主义暴行、抵制日货的爱国高潮。1920年1月23日,天津学生联合会日货调查员在东门内魁发成洋广杂货铺调查私运日货时,遭到日本浪人的毒打,警察厅非但不惩办奸商和凶手,反而于翌日出动军警殴打逮捕了马骏、马千里等20多名示威请愿学生和各界联合会代表,并查封了天津学生联合会和天津各界联合会。反动当局的这一罪恶行径激怒了周恩来、于兰渚(于方舟)等爱国学生,于是,29日,在周恩来、于兰渚的领导下,五六千名学生走上街头,浩浩荡荡地向省长公署进发……

关键词：周恩来斗争郭隆真演讲天津各界联合会天津学生联合会

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刺杀程锡庚案真相

档案春秋 2011年第1期 57-61页

作者：周利成

在查阅档案、报刊资料的基础上,我曾在10年前撰写过《程锡庚命丧大光明》一文。2009年初我与当年刺杀程锡庚的祝宗梁先生取得联系,年逾九旬的祝先生身体健康、记忆清楚,他不但对我讲述了刺杀程锡庚的过程,而且还寄来了一本名为《抗日杀... 详细信息

在查阅档案、报刊资料的基础上,我曾在10年前撰写过《程锡庚命丧大光明》一文。2009年初我与当年刺杀程锡庚的祝宗梁先生取得联系,年逾九旬的祝先生身体健康、记忆清楚,他不但对我讲述了刺杀程锡庚的过程,而且还寄来了一本名为《抗日杀奸团回忆录》小册子,其中也有对此案的记述。后又查

关键词：程锡庚大家重庆汉奸祝宗梁英租界工部局日本外务省临时政府温世珍

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中国话剧的奠基人之一——张彭春

档案春秋 2007年第12期 37-38页

作者：周利成

在纪念中国话剧诞生100周年的日子里,我们不应该忘记一个人,他的话剧作品《醒》,比被认作"中国现代文学史上第一部话剧剧本"《终身大事》早三年;他的导演生涯,比被誉为"中国最早的导演"洪深早六年;他是引领曹禺走上话剧创作道路的第一人... 详细信息

在纪念中国话剧诞生100周年的日子里,我们不应该忘记一个人,他的话剧作品《醒》,比被认作"中国现代文学史上第一部话剧剧本"《终身大事》早三年;他的导演生涯,比被誉为"中国最早的导演"洪深早六年;他是引领曹禺走上话剧创作道路的第一人;他是戏剧大师梅兰芳访美、访苏演出的导演兼顾问。他就是被誉为中国话剧奠基人之一的张彭春。

关键词：张彭春演员曹禺奠基人南开学校话剧剧种梅兰芳导演中国现代文学史戏剧理论艺术理论剧本