检索结果-南通市图书馆

Reduced graphene oxide aerogel decorated with Mo_(2)C nanoparticles toward multifunctional properties of hydrophobicity,thermal insulation and microwave absorption

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 536-547页

作者： Yahui Wang Minghui Zhang xuesong deng Zhigang Li Zongsheng Chen Jiaming Shi Xijiang Han Yunchen Du Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province National University of Defense TechnologyHefei 230037China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei 230037China Anhui Provincial Laboratory of Advanced Laser Technology National University of Defense TechnologyHefei 230037China

Reduced graphene oxide(rGO)aerogels are emerging as very attractive scaffolds for high-performance electromagnetic wave absorption materials(EWAMs)due to their intrinsic conductive networks and intricate interior microstructure,as well as good compatibility with other electromagnetic(EM)***,we realized the decoration of rGO aerogel with Mo_(2)C nanoparticles by sequential hydrothermal assembly,freeze-drying,and high-temperature *** show that Mo_(2)C nanoparticle loading can be easily controlled by the ammonium molybdate to glucose molar *** hydrophobicity and thermal insulation of the rGO aerogel are effectively improved upon the introduction of Mo_(2)C nanoparticles,and more importantly,these nanoparticles regulate the EM properties of the rGO aerogel to a large *** more Mo_(2)C nanoparticles may decrease the overall attenuation ability of the rGO aerogel,they bring much better impedance *** a molar ratio of 1:1,a desirable balance between attenuation ability and impedance matching is *** this context,the Mo_(2)C/r GO aerogel displays strong reflection loss and broad response bandwidth,even with a small applied thickness(1.7 mm)and low filler loading(9.0wt%).The positive effects of Mo_(2)C nanoparticles on multifunctional properties may render Mo_(2)C/r GO aerogels promising candidates for high-performance EWAMs under harsh conditions.

关键词： Mo_(2)C/reduced graphene oxide aerogel microwave absorption dielectric loss hydrophobicity thermal insulation

Theoretical study on the effect of H_(2)O on the formation mechanism of NO_(x) precursors during indole pyrolysis

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第6期18卷 99-112页

作者： Ziqi Wang Jun Shen xuesong Liu Sha Wang Shengxiang deng Hai Zhang Yun Guo School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The incineration technology of kitchen waste is one of the effective technologies to achieve the resource utilization of municipal solid *** is an important stage of *** is a rich initial product in the pyrolysis process of kitchen waste,and the presence of H_(2)O has a significant impact on the decomposition of indole to form NO_(x) ***,this study uses density functional theory method to study the effect of H_(2)O on the thermal decomposition of indole to produce NH_(3),HNCO,and *** H_(2)O participates in the reaction,it can provide oxidative groups to generate a new product HNCO,which is different from the previous findings by indole pyrolysis without the presence of H_(2)***,this study theoretically proves that NH_(3) is easier to form than *** is consistent with the phenomenon that NH_(3) release is higher than HCN release in pyrolysis *** addition,compared with the individual pyrolysis of indole,the participation of H_(2)O reduces the energy barriers for the formation of NH_(3) and HCN during indole pyrolysis,thereby promoting the formation of NH_(3) and HCN.

关键词： indole pyrolysis H_(2)O NO_(x)precursors DFT

Investigation into wideband electromagnetic stealth device based on plasma array and radar-absorbing materials

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第11期24卷 54-62页

作者： xuesong deng Chenglong DING Yahui WANG Zhigang LI Li CHENG Zongsheng CHEN Xiangyin LV Jiaming SHI State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei 230037People’s Republic of China Anhui Provincial Laboratory of Advanced Laser Technology National University of Defense TechnologyHefei 230037People’s Republic of China Key Laboratory of Infrared and Low Temperature Plasma of Anhui Province National University of Defense TechnologyHefei 230037People’s Republic of China

Manipulation of electromagnetic waves is essential to various microwave applications,and absorbing devices composed of low-pressure gas discharge tubes and radar-absorbing materials(RAM)can bring new solutions to broadband electromagnetic *** microwave transmission method is used to measure the physical parameters of the plasma *** designed structure exhibits superior absorption performance and radar cross-section(RCS)reduction capability in the 2–18 GHz band,with unique absorption advantage in the S and C frequency *** is found that the combination of the plasma and the RAM can significantly broaden the absorption frequency band and improve the absorption performance with excellent synergistic stealth *** and simulation results present that broadband,wide-angle,tunable electromagnetic wave absorption and RCS reduction can be achieved by adjusting the spatial layout of the combined plasma layer and the type of RAMs,which creates opportunities for microwave transmission and selective stealth of ***,the wave manipulation by combined plasma array and RAM provides a valuable reference for developing numerous applications,including radar antenna stealth,spatial filter,and high power microwave shielding.

关键词： radar stealth plasma stealth radar cross-section absorber

Irisin-loaded electrospun core-shell nanofibers as calvarial periosteum accelerate vascularized bone regeneration by activating the mitochondrial SIRT3 pathway

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2024年第1期3卷 44-57页

作者： Xi Hua Mingzhuang Hou Lei deng Nanning Lv Yong Xu xuesong Zhu Huilin Yang Qin Shi Hao Liu Fan He Department of Orthopaedics The First Affiliated Hospital of Soochow UniversitySoochow UniversitySuzhou 215006China Orthopaedic Institute Suzhou Medical CollegeSoochow UniversitySuzhou 215000China Department of Orthopedics Suzhou Wuzhong People’s HospitalSuzhouJiangsu Province 215128China Department of Orthopedic Surgery Lianyungang Clinical College of Xuzhou Medical UniversityLianyungang 222003China

The scarcity of native periosteum poses a significant clinical barrier in the repair of critical-sized bone *** challenge of enhancing regenerative potential in bone healing is further compounded by oxidative stress at the fracture ***,the introduction of artificial periosteum has demonstrated its ability to promote bone regeneration through the provision of appropriate mechanical support and controlled release of proosteogenic *** this study,a poly(L-lactic acid)(PLLA)/hyaluronic acid(HA)-based nanofibrous membrane was fabricated using the coaxial electrospinning *** incorporation of irisin into the core-shell structure of PLLA/HA nanofibers(PLLA/HA@Irisin)achieved its sustained *** vitro experiments demonstrated that the PLLA/HA@Irisin membranes exhibited favorable *** osteogenic differentiation of bone marrow mesenchymal stem cells(BMMSCs)was improved by PLLA/HA@Irisin,as evidenced by a significant increase in alkaline phosphatase activity and matrix ***,PLLA/HA@Irisin significantly enhanced the mitochondrial function of BMMSCs via the activation of the sirtuin 3 antioxidant *** assess the therapeutic effectiveness,PLLA/HA@Irisin membranes were implanted in situ into critical-sized calvarial defects in *** results at 4 and 8 weeks post-surgery indicated that the implantation of PLLA/HA@Irisin exhibited superior efficacy in promoting vascularized bone formation,as demonstrated by the enhancement of bone matrix synthesis and the development of new blood *** results of our study indicate that the electrospun PLLA/HA@Irisin nanofibers possess characteristics of a biomimetic periosteum,showing potential for effectively treating critical-sized bone defects by improving the mitochondrial function and maintaining redox homeostasis of BMMSCs.

关键词： periosteum irisin mitochondrial function critical-sized bone defect redox homeostasis

设计参数对铅黏弹性阻尼器力学性能影响的有限元分析

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

建筑结构学报 2016年第S1期37卷 62-70页

作者：石菲周云邓雪松广州大学土木工程学院广东广州510006

为研究设计参数对铅黏弹性阻尼器力学性能的影响,采用ABAQUS有限元软件对铅黏弹性阻尼器进行数值模拟,在验证了有限元分析结果正确性的基础上,对22组不同参数的铅黏弹性阻尼器进行有限元数值模拟分析,研究了黏弹性层面积、铅芯直径、铅... 详细信息

为研究设计参数对铅黏弹性阻尼器力学性能的影响,采用ABAQUS有限元软件对铅黏弹性阻尼器进行数值模拟,在验证了有限元分析结果正确性的基础上,对22组不同参数的铅黏弹性阻尼器进行有限元数值模拟分析,研究了黏弹性层面积、铅芯直径、铅芯布置形式、薄钢板与单层橡胶层厚度比、复合黏弹性层厚度以及橡胶剪切模量等参数对阻尼器力学性能的影响。结果表明:黏弹性层面积越小,屈服后刚度越小,等效黏滞阻尼比越大;铅芯直径越大,屈服荷载和屈服位移越大,滞回曲线越饱满;四铅芯布置形式更有利于铅芯屈服耗能;薄钢板与单层橡胶层厚度比以及复合黏弹性层厚度越大屈服后刚度越小;橡胶剪切模量越大屈服后刚度线性增大;最后给出了铅黏弹性阻尼器各设计参数的建议值:黏弹性层边长可取400 mm;铅芯直径大小应根据阻尼器所需要的屈服荷载确定,宜采用4个铅芯布置形式;薄钢板与单层橡胶厚度比宜控制在0.2~0.7之间;复合黏弹性层厚度宜取28~40 mm;橡胶剪切模量宜取0.3~0.6 MPa。

关键词：铅黏弹性阻尼器有限元分析力学性能

超声造影在胰腺囊/实性病变诊断中的应用现状与进展

在线全文

学校读者我要写书评

暂无评论

中国普通外科杂志 2023年第9期32卷 1402-1409页

作者：袁克荣邓雪松深圳市第二人民医院/深圳大学第一附属医院肝胆胰脾外科广东深圳518035

超声造影(CEUS)是一种操作相对简便,可重复进行,实时动态,安全性好且可高度敏感反映病变微循环灌注的超声检查新手段,成为目前超声医学领域发展最快的技术之一。笔者对近年来CEUS在胰腺囊/实性病变的应用及研究进展作一综述,以期更全面... 详细信息

超声造影(CEUS)是一种操作相对简便,可重复进行,实时动态,安全性好且可高度敏感反映病变微循环灌注的超声检查新手段,成为目前超声医学领域发展最快的技术之一。笔者对近年来CEUS在胰腺囊/实性病变的应用及研究进展作一综述,以期更全面了解CEUS在胰腺囊/实性病变定性分析的诊疗优势及面临的困难,进而使其更好地服务于临床。

关键词：胰腺囊肿胰腺肿瘤诊断显像综述

在线全文

学校读者我要写书评

暂无评论

双曲型钢管铅阻尼器设计参数分析研究

建筑结构学报 2019年第4期40卷 151-159页

作者：邓智邓雪松周云曾一凡广州大学土木工程学院广东广州510006

提出一种双曲型钢管铅阻尼器,设计了39组阻尼器模型,采用ABAQUS有限元软件对其进行模拟分析,研究不同削弱比、高径比、钢管内径、过渡段高度、连接段高度和端板嵌入深度等对双曲型钢管铅阻尼器力学性能的影响。研究结果表明:双曲型钢管... 详细信息

提出一种双曲型钢管铅阻尼器,设计了39组阻尼器模型,采用ABAQUS有限元软件对其进行模拟分析,研究不同削弱比、高径比、钢管内径、过渡段高度、连接段高度和端板嵌入深度等对双曲型钢管铅阻尼器力学性能的影响。研究结果表明:双曲型钢管铅阻尼器的滞回曲线饱满且对称,等效阻尼比稳定在0.4～0.5,具有稳定的耗能性能和良好的延性;随着削弱比的增大,初始刚度、屈服后刚度、屈服荷载、屈服位移和最大荷载均不断减小;随着高径比的增大,初始刚度、屈服荷载和最大荷载均逐渐减小,屈服位移逐渐增大;随着钢管内径的增大,初始刚度、屈服后刚度、屈服荷载和最大荷载增大,屈服位移减小;随着嵌入深度的增加,端板应力变小;随着过渡段、连接段高度的增加,双曲型钢管铅阻尼器耗能段中部和端部应力逐渐增大,耗能段中部塑性变形均逐渐增大。建议削弱比取0.30～0.50,高径比取1.7～2.2;钢管内径优先取较大值且不宜小于130 mm;过渡段高度取20～40 mm;连接段高度取10～20 mm,嵌入深度12～15 mm。

关键词：钢管铅阻尼器双曲型设计参数有限元分析力学性能

在线全文

学校读者我要写书评

暂无评论

桥轨相互作用对铁路桥梁设计的影响

铁道建筑 2005年第9期45卷 25-28页

作者：邓雪松中铁二十五局集团科技部广州510600

依据作者在法国SYSTRA公司所参与的京沪高速铁路南京至上海段工程咨询项目桥轨相互作用研究的内容和结果,分析了桥梁刚度、轨道强度等桥轨自身特性变化对研究结果的影响,从而提出了在桥梁设计阶段确定桥轨自身特性的原则。

关键词：桥轨相互作用铁路桥梁设计桥轨自身特性

在线全文

学校读者我要写书评

暂无评论

钢管铅芯阻尼器性能分析研究

地震工程与工程振动 2013年第6期33卷 215-221页

作者：卢德辉周云邓雪松广州大学土木工程学院广东广州510006

钢管铅芯阻尼器具有耗能性能优良、工作性能稳定、工作机理明确、构造简单合理,且布置安装方便和造价便宜的特点。本文介绍该阻尼器的构造形式、工作机理、布置形式及特点,建立有限元模型分析不同的构造参数对该阻尼器性能的影响,提出... 详细信息

钢管铅芯阻尼器具有耗能性能优良、工作性能稳定、工作机理明确、构造简单合理,且布置安装方便和造价便宜的特点。本文介绍该阻尼器的构造形式、工作机理、布置形式及特点,建立有限元模型分析不同的构造参数对该阻尼器性能的影响,提出钢管铅芯阻尼器的设计建议。研究结果表明:随高宽比增大,屈服力、屈服刚度和屈服后刚度减小,屈服位移和延性增大;随厚径比增大,屈服力、屈服刚度和屈服后刚度增大,延性减小,屈服位移变化不明显;随加强厚度比增大,屈服后刚度增大,延性减小,其它性能参数变化不明显;加强长度比和挤压率的变化对钢管铅芯阻尼器各性能参数影响一般。根据各参数对钢管铅阻尼器力学性能的影响规律,给出该阻尼器各设计参数的优化取值范围。

关键词：钢管铅芯阻尼器组合式耗能减震削弱优化设计