检索结果-南通市图书馆

Chinese Journal of Polymer Science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu shao-yun guo Feng-Shun Zhang Jian-Hui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

Bilayer Compounded Polytetrafluoroethylene Membrane for Enhanced Oil-Water Emulsion Separation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 838-850页

作者： Yu-Liang Yang Tai-Ran Zhang Yan-Ting Han shao-yun guo Qin-Gong Rong Jia-Bin Shen State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversitySichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyChengdu610065China West China Hospital/West China School of Nursing Sichuan UniversityChengdu610041China Shandong Senrong New Materials Co. Ltd.Zibo256401China

In order to achieve efficient and durable oil-water emulsion separation,the membranes possessing high separation efficiency and mechanical strength attract extensive attention and are in great *** present study,a kind of polytetrafluoroethylene(PTFE)-based bilayer membrane was fabricated by electrospinning fibrous PTFE(fPTFE)on an expanded PTFE(ePTFE)*** morphological observation revealed that the fibrous structure of the fPTFE layer could be tailored by controlling the formulation of spinning *** addition of appropriate polyoxyethylene(PEO)would make the fibers in the fPTFE layer finer and more *** a result,the compounded membrane exhibited a small pore size of approximately 1.25µm and a substantial porosity nearing 80%.This led to super-hydrophobicity,characterized by a high water contact angle(WCA)of 149.8°,and facilitated rapid oil *** water-in-oil emulsion separation experiment further confirmed that the compounded membrane not only had a high separation efficiency closing 100%,but such an outstanding separation capacity could be largely retained,either through multiple cycles of use or through strong acid(pH=1),strong alkali(pH=12),or high-temperature(100°C)***,the mechanical behavior of the bilayer membrane was basically contributed by that of each layer in terms of their volume *** significantly,the poor creep resistance of fPTFE layer was suppressed by compounding with ePTFE ***,this study has laid the groundwork for a novel approach to create PTFE-based compounded membranes with exceptional overall characteristics,showing promise for applications in the realm of emulsion separation.

关键词： ePTFE Electrospinning membrane Bilayer compounding Emulsion separation

Flame-retardant and Self-healing Biomass Aerogels Based on Electrostatic Assembly

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第12期38卷 1294-1304页

作者： Ji-Yu Yang Yu Xia Jin Zhao Long-Fei Yi Yong-Jiao Song Hong Wu shao-yun guo Li-Juan Zhao Jin-Rong Wu College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610066China State Key Laboratory ofPolymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu 610065China State Key Laboratory ofPolymer Materials Engineering Collegeof Polymer Science and EngineeringSichuan UniversityChengdu 610065China

It remains a significant challenge to fabricate self-healing aerogels with excellent flame ***,we develop a class of biomass aerogels by electrostatically assembling chitosan(CS),phytic acid(PA),and itaconic acid(IA).The electrostatic interaction between CS and IA is weak and dynamic,so freeze-drying the solution of CS and IA enables the formation of continuous aerogel skeleton with self-healing ability and re-programmability;in comparison,the electrostatic interaction between CS and PA is strong and less dynamic,and thus mixing PA with CS in aqueous solution leads to fine precipitates of high flame retardancy due to the synergistic phosphorus-nitrogen *** the continuous skeleton and the fine precipitates results in self-healing aerogles with UL-4 V-0 rating of flame retardancy aerogels and autoextinguishable ***,the aerogels after burning in flame for 30 s form a skin-core structure,and the carbonized skin protects the integrity of the aerogels and the self-healing ability of the internal ***,this work provides a facile strategy to develop multifunctional aerogels which hold great promise for advanced applications.

关键词： Chitosan Flame retardancy Electrostatic interactions Biomass aerogel Self-healing

硬质聚氯乙烯自然老化的变色行为与分子结构变化

在线全文

学校读者我要写书评

暂无评论

高分子学报 2017年第8期27卷 1374-1381页

作者：徐文文熊英郭少云高分子材料工程国家重点实验室四川大学高分子研究所成都610065

以硬质聚氯乙烯(PVC)为研究对象,通过色差实验、FTIR、UV等方法探究了PVC在湿热、辐射低的琼海和暖温、干旱且辐射高的若羌地区自然老化的变色行为与分子结构变化.结果表明,太阳辐射是影响PVC自然老化过程中变色行为和分子结构变化的主... 详细信息

以硬质聚氯乙烯(PVC)为研究对象,通过色差实验、FTIR、UV等方法探究了PVC在湿热、辐射低的琼海和暖温、干旱且辐射高的若羌地区自然老化的变色行为与分子结构变化.结果表明,太阳辐射是影响PVC自然老化过程中变色行为和分子结构变化的主要环境因素,PVC在干旱、辐射高的若羌地区比在湿热、辐射低的琼海地区更易变黄和变红,而在两地变暗的程度相近;这是因为随着自然老化时间的延长,PVC逐渐发生脱除氯化氢反应和氧化反应,在干旱且辐射高的若羌,更易发生脱除氯化氢反应,而在湿热且辐射低的琼海,脱除氯化氢反应和氧化反应的速度相近,在若羌老化的PVC样品生成了更多的共轭长度(n)≥8的C=C长共轭序列所致.

关键词：硬质PVC 自然老化太阳辐射变色行为 C=C长共轭序列

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng Wang guo-Cui Mao Hui-Lin Jiang Bao-Xia Dong yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： Metal hydride Ni catalysts Carbonate Metal-carbonate interface

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

高分子材料刮擦行为研究进展

高分子学报 2018年第10期28卷 1262-1278页

作者：徐杨李顿沈佳斌郭少云 Hung-Jue Sue 四川大学高分子研究所高分子材料工程国家重点实验室成都610065 Polymer Technology Center Department of Materials Science and EngineeringTexas A&M UniversityCollege Station

随着高分子材料在光学、包装、汽车及建筑装饰等领域的广泛应用,市场对其表面质量的要求越来越高.刮擦是尖锐硬物在材料表面滑动时产生的一种力学变形和破坏行为.多维复杂应力的作用使材料表面因塑性变形而形成可见划痕,从而对材料的美... 详细信息

随着高分子材料在光学、包装、汽车及建筑装饰等领域的广泛应用,市场对其表面质量的要求越来越高.刮擦是尖锐硬物在材料表面滑动时产生的一种力学变形和破坏行为.多维复杂应力的作用使材料表面因塑性变形而形成可见划痕,从而对材料的美观性、完整性和持久性带来负面影响.近年来,随着刮擦测试方式和相关标准的建立,并结合计算机的模拟预测,研究者们对高分子材料在刮擦过程中的破坏模式与机理及其内在多层次结构与刮擦性能关系的理解日趋深入,从而为高分子材料的耐刮擦性能改性提供了重要的实验和理论依据.基于此,本文综述了国内外在高分子材料刮擦性能测试和表征方法、刮擦过程中的变形与破坏机理、刮擦行为的影响因素以及耐刮擦改性方法等方面的研究进展.

关键词：高分子材料表面刮擦结构与性能

聚丙烯/阻燃剂填充聚丙烯交替层状复合材料的阻燃及力学性能研究

在线全文

学校读者我要写书评

暂无评论

高分子学报 2014年第10期24卷 1350-1355页

作者：高万里陈宝书沈佳斌郭少云高分子材料工程国家重点实验室四川大学高分子研究所成都610065

利用微层共挤出技术制备得到不同层数(2、4、16和64层)的聚丙烯(PP)/阻燃剂(IFR)填充PP(PPFR)交替层状复合材料,研究了层数改变对复合材料阻燃和力学性能的影响.偏光显微镜观察发现,PP层与PPFR层沿层状样品的厚度方向交替排布,层界面则... 详细信息

利用微层共挤出技术制备得到不同层数(2、4、16和64层)的聚丙烯(PP)/阻燃剂(IFR)填充PP(PPFR)交替层状复合材料,研究了层数改变对复合材料阻燃和力学性能的影响.偏光显微镜观察发现,PP层与PPFR层沿层状样品的厚度方向交替排布,层界面则随着层数的增加而增多.非等温结晶测试结果显示,界面的增多使更多的IFR可以分布在层界面附近,使整个层状复合体系表现出越来越接近传统IFR填充体系的异相成核结晶行为,表明IFR的分布可以通过层数的调节进行调控.垂直燃烧、极限氧指数(LOI)以及微型量热测试结果表明,层数提高可以有效提高复合体系自熄能力,显著降低热释放速率.与2层试样相比,64层试样的LOI从19.5提高到了25.而拉伸性能测试结果显示,随着层数增加,复合材料的拉伸强度变化较小,但断裂伸长率显著提高.

关键词：聚丙烯阻燃剂多层分布阻燃性能力学性能

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun yun Wen-Biao Han Yi-Yang guo He Wang Minghui Du Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

Decreased levels of phosphorylated synuclein in plasma are correlated with poststroke cognitive impairment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2598-2610页

作者： Yi Wang yuning Li Yakun Gu Wei Ma Yuying Guan Mengyuan guo Qianqian shao Xunming Ji Jia Liu Department of Clinical Laboratory Beijing Bo’ai HospitalChina Rehabilitation Research CenterCapital Medical UniversityBeijingChina Beijing Institute of Brain Disorders Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersBeijing Advanced Innovation Center for Big Data-based Precision MedicineCapital Medical UniversityBeijingChina Department of Neurosurgery Xuanwu HospitalCapital Medical UniversityBeijingChina

Poststro ke cognitive impairment is a major secondary effect of ischemic stroke in many patients;however,few options are available for the early diagnosis and treatment of this *** aims of this study were to(1)determine the specific relationship between hypoxic andα-synuclein during the occur of poststroke cognitive impairment and(2)assess whether the serum phosphorylatedα-synuclein level can be used as a biomarker for poststro ke cognitive *** found that the phosphorylatedα-synuclein level was significantly increased and showed pathological aggregation around the cerebral infa rct area in a mouse model of ischemic *** addition,neuronalα-synuclein phosphorylation and aggregation were observed in the brain tissue of mice subjected to chronic hypoxia,suggesting that hypoxia is the underlying cause ofα-synuclein-mediated pathology in the brains of mice with ischemic *** phosphorylatedα-synuclein levels in patients with ischemic stroke were significantly lower than those in healt hy subjects,and were positively correlated with cognition levels in patients with ischemic ***,a decrease in serum high-density lipoprotein levels in stroke patie nts was significantly correlated with a decrease in phosphorylatedα-synuclein *** ischemic stroke mice did not show significant cognitive impairment or disrupted lipid metabolism 14 days after injury,some of them exhibited decreased cognitive function and reduced phosphorylatedα-synuclein *** together,our results suggest that serum phosphorylatedα-synuclein is a potential biomarker for poststroke cognitive impairment.

关键词： biomarker high-density lipoprotein ischemic stroke phosphorylatedα-synuclein poststroke cognitive impairment

Advances in Graphene‑Based Electrode for Triboelectric Nanogenerator

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第1期17卷 378-403页

作者： Bin Xie Yuanhui guo yun Chen Hao Zhang Jiawei Xiao Maoxiang Hou Huilong Liu Li Ma Xin Chen Chingping Wong State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

With the continuous development of wearable electronics,wireless sensor networks and other micro-electronic devices,there is an increasingly urgent need for miniature,flexible and efficient nanopower generation *** nanogenerator(TENG)technology can convert small mechanical energy into electricity,which is expected to address this *** the core component of TENG,the choice of electrode materials significantly affects its *** metal electrode materials often suffer from problems such as durability,which limits the further application of ***,as a novel electrode material,shows excellent prospects for application in TENG owing to its unique structure and excellent electrical *** review systematically summarizes the recent research progress and application prospects of TENGs based on graphene *** precision processing methods of graphene electrodes are introduced,and the applications of graphene electrode-based TENGs in various scenarios as well as the enhancement of graphene electrodes for TENG performance are *** addition,the future development of graphene electrode-based TENGs is also prospectively discussed,aiming to promote the continuous advancement of graphene electrode-based TENGs.

关键词： Triboelectric nanogenerator Precision processing Graphene electrode Self-powered sensor