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Enhanced High-Temperature Energy Storage Performance of All-Organic Composite Dielectric via Constructing Fiber-Re in forced Structure

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Energy & Environmental Materials 2024年第2期7卷 299-307页

作者： Mengjia Feng yu Feng Changhai Zhang Tiandong Zhang Xu Tong Qiang Gao Qingguo chen Qingguo Chi Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080China

Optimizing the high-temperature energy storage characteristics of energy storage dielectrics is of great significance for the development of pulsed power devices and power control *** a polymer with a higher glass transition temperature(T_(g))as the matrix is one of the effective ways to increase the upper limit of the polymer operating ***,current high-T_(g)polymers have limitations,and it is difficult to meet the demand for high-temperature energy storage dielectrics with only one *** example,polyetherimide has high-energy storage efficiency,but low breakdown strength at high *** has high corona resistance,but low high-temperature energy storage *** this work,combining the advantages of two polymer,a novel high-T_(g)polymer fiber-reinforced microstructure is *** is designed as extremely fine fibers distributed in the composite dielectric,which will facilitate the reduction of high-temperature conductivity loss for *** the same time,due to the high-temperature resistance and corona resistance of polyimide,the high-temperature breakdown strength of the composite dielectric is *** the polyimide content with the best high-temperature energy storage characteristics is determined,molecular semiconductors(ITIC)are blended into the polyimide fibers to further improve the high-temperature ***,excellent high-temperature energy storage properties are *** 0.25 vol%ITIC-polyimide/polyetherimide composite exhibits high-energy density and high discharge efficiency at 150℃(2.9 J cm^(-3),90%)and 180℃(2.16 J cm^(-3),90%).This work provides a scalable design idea for high-performance all-organic high-temperature energy storage dielectrics.

关键词： all-organic energy storage density high-temperature high-temperature breakdown strength

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Determining absolute value of thermal neutron flux density based on monocrystalline silicon in nuclear reactors

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Nuclear Science and Techniques 2022年第7期33卷 133-138页

作者： V.A.Varlachev E.G.Emets yu-chen Mu E.A.Bondarenko V.A.Govorukhin National Research Tomsk Polytechnic University Tomsk634050Russia

A new type of neutron detector based on monocrystalline Si is developed to measure the fluence and flux density of thermal and fast *** principle of this detector is based on the relationship between changes in electrical conductivity and neutron fluence during ***,the absolute values of thermal neutron fluence and flux density are measured in a facile manner with high *** with activation methods,our method not only possesses a similar accuracy,but also demonstrates superior application potential for the investigation of neutron fields in nuclear reactors owing to its suitable half-life.

关键词： Thermal neutron Neutron detector Neutron flux density Cadmium difference methods

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Research on the influences of confining pressure and strain rate on NEPE propellant:Experimental assessment and constitutive model

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Defence Technology（防务技术） 2021年第5期17卷 1764-1774页

作者： Hui Li Jin-sheng Xu Jia-ming Liu Ting-yu Wang Xiong chen Hong-wen Li School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Technology Center Jinxi Industries Group CorporationTaiyuan030027China

In order to study the influences of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether(NEPE)propellant,uniaxial tensile tests were conducted using the selfmade confining pressure system and material testing *** stress-strain responses of the NEPE propellant under different confining pressure conditions and strain rates were obtained and *** results show that confining pressure and strain rate have a remarkably influence on the mechanical responses of the NEPE *** confining pressure increases(from 0 to 5.4 MPa),the maximum tensile stress and ultimate strain increase *** the coupled effects of confining pressure and strain rate,the value of the maximum tensile stress and ultimate strain at 5.4 MPa and 0.0667 s^(-1)is 2.03 times and 2.19 times of their values under 0 MPa and 0.00333 s^(-1),***,the influence mechanism of confining pressure on the NEPE propellant was ***,based on the viscoelastic theory and continuous damage theory,a nonlinear constitutive model considering confining pressure and strain rate was *** damage was considered to be rate-dependent and *** constitutive model was validated by comparing experimental data with predictions of the constitutive *** whole maximum stress errors of the model predictions are lower than 4%and the corresponding strain errors are lower than 7%.The results show that confining pressure can suppress the damage initiation and evolution of the NEPE propellant and the nonlinear constitutive model can describe the mechanical responses of the NEPE propellant under various confining pressure conditions and strain *** research can lay a theoretical foundation for analyzing the structural integrity of propellant grain accurately under working pressure loading.

关键词： Confining pressure Strain rate NEPE propellant Constitutive model Damage

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Adenovirus sneak attacks during the H7N9 flu season

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Science China(Life Sciences) 2013年第9期56卷 863-864页

作者： XU Jun LI chen WALLINE Joseph yu XueZhong Chinese Academy of Medical Sciences Peking Union Medical Hospital Division of Emergency Medicine Department of Surgery Saint Louis University Hospital

The H7N9 influenza virus made headlines recently, with outbreaks in Chinese urban centers. These infections continue a recent trend of novel virus outbreaks, such as those involving SARS coronavirus and the H1N1 influenza virus. These outbreaks have been likened to tropical storms, and like prior ＇viral storms＇ the latest H7N9 influenza virus has aroused public panic despite the fact that H7N9 infection rates are sporadic.

关键词：流感病毒腺病毒 SARS冠状病毒偷袭季节热带风暴城市中心感染率

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Tuberous sclerosis complex-lymphangioleiomyomatosis involving several visceral organs:A case report

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World Journal of Clinical Cases 2021年第24期9卷 7085-7091页

作者： Hong-Bin chen Xiao-Hong Xu Cai-Gui yu Meng-Ting Wan Chuang-Li Feng Zhi-yu Zhao Dan-E Mei Jin-Ling chen Department of Pulmonary and Critical Care Medicine Renmin Hospital of Wuhan UniversityWuhan 430060Hubei ProvinceChina Department of Pulmonary and Critical Care Medicine People's Hospital of HanchuanHanchuan 431600Hubei ProvinceChina Department of Echocardiography Renmin Hospital of Wuhan UniversityWuhan 430060Hubei ProvinceChina

BACKGROUND Lymphangioleiomyomatosis(LAM)is a rare cystic lung disease characterized by the proliferation,metastasis,and infiltration of smooth muscle cells in the lung and other tissues,which can be associated with tuberous sclerosis complex(TSC).The disorder of TSC has a variable expression,and there is great phenotypic *** SUMMARY A 32-year-old Chinese woman with a history of multiple renal angioleiomyolipoma presented with a productive cough persisting for over 2 *** chest computed tomography revealed interstitial changes,multiple pulmonary bullae,bilateral pulmonary nodules,and multiple fat density areas of the inferior *** and contrast ultrasonography revealed multiple high echogenic masses of the liver,kidneys,retroperitoneum,and inferior *** masses were diagnosed as *** through thoracoscopic lung biopsy confirmed ***,high-throughput genome sequencing of peripheral blood DNA confirmed the presence of a heterozygous mutation,c.1831C>T(***611Trp),of the TSC2 *** patient was diagnosed with *** We highlight a rare case of TSC-LAM and the first report of a mediastinum lymphangioleiomyoma associated with TSC-LAM.

关键词： Tuberous sclerosis complex Lymphangioleiomyomatosis Angioleiomyolipoma High-resolution chest computed tomography Contrast ultrasonography Case report

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Self-twisting for macrochirality from an achiral asterisk molecule with fluorescence-phosphorescence dual emission

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Chinese Chemical Letters 2017年第11期28卷 2151-2154页

作者： Hongwei Wua Bin Wu Xiyuan yu Pei Zhao Wenbo chen Liangliang Zhu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai Key Lab of Polymer and Electrical Insulation School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric Power

Understanding of the role of supramolecular chirality for tuning material optoelectronic properties has been restricted by the limited number of cases. A particular challenge is to impose supramolecular chirality onto multicolor luminescent systems that can emit in aggregation state. Here we present a self- assembly strategy from a well-selected asterisk molecule for generating supramolecular chirality with fluorescence-phosphorescence dual emission. The work takes advantages of （1） achiral chemical structure dependent peculiar self-assembly that can spontaneously undergo symmetry breaking to produce macrochirality, and （2） the assembly process can be monitored by time which due to the crystallization-driven self-assembly by self-twisting, allowing a self-progressing chiral amplification. A multicolor luminescence induced by the fluorescence-phosphorescence dual emission along with such a self-assembly behavior was also observed at a single solution system versus the time. The self-twisting chiral self-assembly fashion provides new prospects for understanding the establishment of nanochirality from achiral molecular building blocks.

关键词： Achiral molecules self-twisting Macrochirality Fluorescence-phosphorescence Dual emission

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Convenient Synthesis of 1-Thiohydroxypyrene by Newman-Kwart Rearrangement

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Chemical Research in Chinese Universities 2015年第2期31卷 224-227页

作者： ZHANG Ran XU Lihua chen Hui QIN Zhihong ZHAO yu Ni Zhonghai School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221116 P. R. China

l-Thiohydroxypyrene（l） and its two intermediates, l-pyrenyl-O-thiocarbamate（2） and l-pyrenyl-S-thiocarbamate（3）, were synthesized using l-hydroxypyrene as the starting material. The key synthetic step is New- manoKwart rearrangement. The results indicate that the Newman-Kwart rearrangement is more effective in suitable solvent than conventional method based on pure organic compound. The structures of compounds 1-3 were characterized by FTIR, NMR, CJC-MS and elementary analysis. The crystal structures of two new compounds（2 and 3） were determined by single crystal X-ray diffraction analysis. The whole synthetic process is simple, mild and with high yield.

关键词： Newman-Kwart rearrangement l-Thiohydroxypyrene Crystal structure

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Investigation of cavitation erosion caused by laser-induced single bubble collapse near alloy coating surface

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Journal of Hydrodynamics 2023年第5期35卷 876-886页

作者： Hai-gang Wen Zhi-feng Yao Qin Wu yu-rong Sun chen-xi Yang Qiang Zhong College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System China Agricultural UniversityBeijing100083China School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

To investigate the mechanism of cavitation erosion caused by laser-induced single bubble near the surface coating alloy coating material, we utilized a nanosecond resolution photography system based on a Q-switched Nd: YAG laser and conventional industrial camera to carefully observe the transient process of bubble collapse under different conditions. We analyzed the generation of collapse microjets and the emission of collapse shock waves and explored the cavitation erosion characteristics caused by laser-induced single bubble collapse. We discovered that even on surfaces of highly hard and corrosion-resistant alloy coatings, severe cavitation erosion occurred, and there was a phenomenon of mismatch between the cavitation erosion location and the bubble projection position. The intensity of cavitation erosion depended on the energy self-focusing effect of the collapse shockwaves. In the experiments, we also observed the self-focusing phenomenon of collapse shockwaves under different conditions. The self-focusing effect of collapse shockwaves weakened as the distance between the bubble and the material surface increased, which may be the cause of cavitation erosion induced by a laser-induced single bubble.

关键词： Cavitation erosion bubble collapse laser-induced shock wave self-focusing effect

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Synthesis of novel thiol-functionalized mesoporous silica nanorods and their sorbent properties on heavy metals

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Frontiers of Materials Science 2012年第3期6卷 278-282页

作者： Xi chen Qiang CAI Lin-Hao SUN Wei ZHANG Xing-yu JIANG Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084China National Center for Nanoscience and Technology Beijing 100190China

Novel thiol-functionalized mesoporous silica nanorods （MSNRs） were synthesized through a base co-condensation method, in which two organoalkoxysilanes, tetraethoxylsilane （TEOS） and bis[3-（triethoxysilyl）propyl]tetrasulfide （TESPT）, were used as silica precursors simultaneously. TESPT was firstly used for both morphology control and inner surface functionalization of mesoporous silica hybrid materials. The micro- structures as well as porous character of the MSNRs were characterized by means of SEM, XRD, TEM and N2 sorption measurements. Infrared spectrum analysis and heavy metal ions （Ag＋ and Cd2＋） adsorption measurements were carried out to confirm the functionalized framework of MSNRs.

关键词： nanocomposite porous material morphology control inner surfacefunctionalization sorbent

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Dynamical Study of the Radiation Environment at the Interaction Region of BEPC

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Chinese Physics Letters 1993年第5期10卷 279-281页

作者： chen yu GU Yifan LI Jianping TANG yueli Institute of High Energy Physics Academia SinicaDeijing 100039

A method to study dynamically the radiation environment at the interaction region of the Beijing Electron-Positron Collider is *** is shown that the radiation levels are closely correlated to the beam conditions of the collider:most radiation occurs during injection and sudden loss(or dump)of beam,while Colliding beams produce at least an order of magnitude less radiation background which decreases gradually with *** using this method,an extra source of background for the Beijing Spectrometer experiment at the collider has been found and eliminated.

关键词： beam eliminated Dynamical

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