检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

等离激元隧道结(特邀)

激光与光电子学进展 2024年第3期61卷 240-247页

作者：冯源佳郑钧升杨若雪王攀浙江大学光电科学与工程学院极端光学技术与仪器全国重点实验室浙江杭州310027

等离激元隧道结是可以同时支持表面等离激元响应与电子隧穿效应的具有纳米尺度介质间隙的金属-绝缘体-金属结构。隧道结中电子、等离激元和光子等受到极强的约束并发生丰富的相互作用,这为在纳米尺度上研究和操控电子、光子,以及发展新... 详细信息

等离激元隧道结是可以同时支持表面等离激元响应与电子隧穿效应的具有纳米尺度介质间隙的金属-绝缘体-金属结构。隧道结中电子、等离激元和光子等受到极强的约束并发生丰富的相互作用,这为在纳米尺度上研究和操控电子、光子,以及发展新一代纳米光电子器件提供了一个新的平台。本文综述了等离激元隧道结在等离激元激发/发光和等离激元/光子-电子转换中的应用。

关键词：表面等离激元隧道结电子隧穿等离激元激发光电转换

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

碳基复合材料双极板真空浸渍制备工艺

材料工程 2024年第3期52卷 44-51页

作者：詹梓泽郑俊生樊润林姚东梅陈静明平文同济大学新能源汽车工程中心上海201804 同济大学汽车学院上海201804

采用真空浸渍树脂的方法制备燃料电池复合材料双极板,研究真空浸渍过程环氧树脂稀释剂的添加量、温度以及石墨的孔隙结构对浸渍树脂量的影响,并考察制备的燃料电池双极板的导电性能、抗弯强度以及气密性能。结果表明:环氧树脂稀释剂含... 详细信息

采用真空浸渍树脂的方法制备燃料电池复合材料双极板,研究真空浸渍过程环氧树脂稀释剂的添加量、温度以及石墨的孔隙结构对浸渍树脂量的影响,并考察制备的燃料电池双极板的导电性能、抗弯强度以及气密性能。结果表明:环氧树脂稀释剂含量的增加和温度的提高可以降低树脂黏度,进而提高树脂的浸渍上限,使树脂能够浸渍填充到更微小的孔隙中,同时仍然存在着一些孔隙无法填充浸透,在膨胀石墨板中0.1μm以下的孔隙难以被完全渗进,导致树脂无法完全填满膨胀石墨的整个孔隙。采用真空浸渍法浸渍环氧树脂/稀释剂体系的适宜温度为50℃,稀释剂乙二醇二缩水甘油醚最优添加比例为15%(质量分数),所获得的双极板EGP-H平面电导率为340.12 S/cm,抗弯强度为41.52 MPa,氦气渗透率为5.4×10^(-7)cm^(3)·cm^(-2)·s^(-1)。

关键词：燃料电池双极板真空浸渍膨胀石墨

在线全文

学校读者我要写书评

暂无评论

复合石墨双极板材料及性能的研究进展

材料工程 2024年第2期52卷 102-111页

作者：李团锋张璐瑶樊润林孟晓敏胡杨月刘聪温序晖郑俊生明平文东方电气(成都)氢燃料电池科技有限公司成都611731 同济大学新能源汽车工程中心上海201804 同济大学汽车学院上海201804 长寿命燃料电池四川省重点实验室成都611731

质子交换膜燃料电池(PEMFC)中的双极板起到传递电子、分配气体、电池内水管理、支撑膜电极组件等作用,也是保证燃料电池堆低成本的关键部件。本文对双极板材料(金属、石墨和复合材料)、作用、优势及挑战进行了分析,其中复合石墨双极板... 详细信息

质子交换膜燃料电池(PEMFC)中的双极板起到传递电子、分配气体、电池内水管理、支撑膜电极组件等作用,也是保证燃料电池堆低成本的关键部件。本文对双极板材料(金属、石墨和复合材料)、作用、优势及挑战进行了分析,其中复合石墨双极板以其长寿命和耐腐蚀的特质,具备与其他双极板竞争的优势,近年来受到高度关注;对石墨形成导电网络的相关因素(涉及填料尺寸、形态,辅助填料桥接石墨颗粒)、聚合物的成分与固化条件以及成型工艺条件对性能的影响规律进行了讨论。未来,开发具有优异综合性能的复合石墨双极板,掌握并优化聚合物结构及反应路径对其性能的平衡作用,使现有配方及成型方法适应大规模生产,将大大增强质子交换膜燃料电池在更多领域的大规模应用。

关键词：双极板石墨树脂复合材料质子交换膜燃料电池

The effect of electrolyte additives on the rate performance of hard carbon anode at low temperature for lithium-ion capacitor

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第8期33卷 3889-3893页

作者： Jianmin Yuan Nan Qin Yanyan Lu Liming Jin junsheng zheng Jim P.zheng Clean Energy Automotive Engineering Center Tongji University(Jiading Campus)Shanghai 201804China School of automotive studies Tongji University(Jiading Campus)Shanghai 201804China Department of Electrical Engineering University at BuffaloThe State University of New YorkBuffaloNew York 14260United States

Lithium-ion capacitor(LIC),which combines the advantages of lithium-ion battery(LIB)and electrical double layer capacitor(EDLC),has a rapid development during last decade,however,the poor low temperature performance still limits its *** this paper,three electrolyte additives including vinylene carbonate(VC),fluoroethylene carbonate(FEC)and 1,3,2-dioxathiolane 2,2-dioxide(DTD)have been utilized and their effects on the rate performance of hard carbon(HC)anode of LIC at various temperatures ranging from 25℃ to-40℃ have been well *** cell containing FEC shows the best rate performance at various temperatures and has the charge and discharge capability even at-40℃.For HC anode,the charge transfer impedance(R_(CT))increases exponentially at low temperature,while the equivalent series resistance(Rs)and the impedance of solid electrolyte interface(SEI)increase relatively *** low temperatures,the effect of FEC may be mainly reflected in its effect on the charge transfer process.

关键词： Hard carbon(HC) Fluoroethylene carbonate(FEC) Low temperature additive Lithium-ion capacitor(LIC)

Constructing an unbalanced structure toward high working voltage for improving energy density of non-aqueous carbon-based electrochemical capacitors

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第3期31卷 903-908页

作者： junsheng zheng Nan Qin Liming Jin Xin Guo Chao Shen Qiang Wu Jim Pzheng Clean Energy Automotive Engineering Center Tongji University(Jiading Campus)Shanghai 201804China School of Automotive Studies Tongji University(Jiading Campus)Shanghai 201804China Department of Electrical and Computer Engineering Florida A&M University-Florida State University College of EngineeringFL 32304United States

The energy density of non-aqueous carbon-based electrochemical capacitors(cEC)is mainly determined by the specific capacitance and operational voltage *** this study,we propose to construct an unbalanced structure to make full use of stable voltage range for improving energy *** stable voltage range is firstly carefully explored using cyclic *** an unbalanced carbon-based electrochemical capacitor(ucEC)is constructed with an optimized positive electrode to negative electrode weight ratio and voltage *** electrochemical performance is comprehensively investigated,including energy density,power density as well as cycle *** ucEC is capable to deliver an improved energy density up to 64.9 Wh/kg(1.4 times as high as a general cEC)without sacrificing the power density and cycle *** electrode properties after cycling are also analyzed,illustrating the change of electrode potential caused by unbalanced *** proposed structure demonstrates a great potential for improving the energy density at little cost of electrode design and cell configuration.

关键词： Unbalanced electrochemical capacitor Non-aqueous electrolyte High working voltage Practical application High energy density

伴MEF2D-BCL9融合基因的急性B淋巴细胞白血病1例

在线全文

学校读者我要写书评

暂无评论

中国优生与遗传杂志 2024年第1期32卷 121-124页

作者：郑俊生刘丽丽李承燕叶中绿广东医科大学附属医院广东湛江524000

目的探讨伴MEF2D-BCL9融合基因在急性B淋巴细胞白血病(B-ALL)预后评估的作用,以提高危险度分层的准确性,并为白血病的个体化诊疗提供临床经验。方法回顾性分析广东医科大学附属医院既往收治的1例伴MEF2D-BCL9融合基因的B-ALL患儿的临床... 详细信息

目的探讨伴MEF2D-BCL9融合基因在急性B淋巴细胞白血病(B-ALL)预后评估的作用,以提高危险度分层的准确性,并为白血病的个体化诊疗提供临床经验。方法回顾性分析广东医科大学附属医院既往收治的1例伴MEF2D-BCL9融合基因的B-ALL患儿的临床特征和诊治经过,并进行相关文献复习。结果7岁男童,2020年12月收入广东医科大学附属医院治疗。通过转录组测序技术(RNA-seq)检测出MEF2D-BCL9融合基因,骨髓流式提示幼稚/原始B淋巴细胞占有核细胞总数的79.3%,符合前B淋巴细胞白血病(pre-B-lymphoblastic leukemia,Pre-B-ALL)。经华南地区儿童急性淋巴细胞白血病治疗协作组2016方案化疗,但在缓解后2个月内复发,家属由于经济原因未同意进行造血干细胞移植,最终因严重感染死亡。结论伴MEF2D-BCL9融合阳性的B-ALL患儿通常表现出对化疗耐药、复发时间较短以及复发后的无病生存率较低等不良预后特征,此外常伴有高白细胞计数、发病年龄大和HDAC9过表达等高危特征,可能受益于靶向治疗和造血干细胞移植。

关键词： MEF2D-BCL9 融合基因白血病治疗

Study on carbon matrix composite bipolar plates with balance of conductivity and flexural strength

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第5期34卷 626-630页

作者： junsheng zheng Yuhang Peng Runlin Fan Jing Chen Zize Zhan Dongmei Yao Pingwen Ming New Energy Automotive Engineering Center Tongji UniversityShanghai 200029China School of Automotive Studies Tongji UniversityShanghai 200092China

In order to balance the conductivity and flexural strength of graphite composite bipolar plates,the influence of conductive filler on the properties of graphite composite bipolar plate was comprehensively studied by using phenolic resin as binder,natural flake graphite as conductive substrate and functional carbon materials with different structures as auxiliary *** results show that the particle size of conductive substrate has an important influence on the conductivity enhancement of auxiliary *** influence of conductive particle size on auxiliary filler electrical conductivity improvement was first investigated in this *** effects of various auxiliary filler concentrations on improving electrical conductivity and flexural strength were then *** research has substantial implications for the balance of electrical conductivity and flexural strength of graphite composite bipolar plates.

关键词： Composite bipolar plates Graphite particle size Auxiliary fillers Electrical conductivity Flexural strength

Material point method simulation of hydro-mechanical behaviour in twophase porous geomaterials: A state-of-the-art review

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2341-2350页

作者： Xiangcou zheng Shuying Wang Feng Yang junsheng Yang School of Civil Engineering Central South UniversityChangsha410075China Geo-Engineering Section Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelftthe Netherlands

The material point method(MPM)has been gaining increasing popularity as an appropriate approach to the solution of coupled hydro-mechanical problems involving large *** this paper,we survey the current state-of-the-art in the MPM simulation of hydro-mechanical behaviour in two-phase porous *** review covers the recent advances and developments in the MPM and their extensions to capture the coupled hydro-mechanical problems involving large *** focus of this review is aiming at providing a clear picture of what has or has not been developed or implemented for simulating two-phase coupled large deformation problems,which will provide some direct reference for both practitioners and researchers.

关键词： Coupled problems Hydro-mechanical behaviour Large deformation Material Point Method(MPM)

Dynamic collapse characteristics of the tunnel face induced by the shutdown of earth pressure balance shields(EPB):A 3D material point method study

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

Underground Space 2024年第3期16卷 164-182页

作者： Shuying Wang Tingyu Liu Xiangcou zheng junsheng Yang Feng Yang School of Civil Engineering Central South UniversityChangsha 410075HunanChina Tunnel and Underground Engineering Research Center of Central South University Changsha 410075HunanChina Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures Central South UniversityChangsha 410075HunanChina

The collapse of the tunnel face is a prevalent geological disaster in *** study employs a three-dimensional(3D)material point method(MPM)to simulate the dynamic collapse process and post-failure mechanisms of the tunnel *** specific focus is on the scenario where the auxiliary air pressure balanced shield with a partially filled chamber is shut *** assess the suitability of the 3D MPM,numerical solutions are compared with the results from small-scale experimental ***,a series of large-scale numerical simulations is conducted to explore the dynamic collapse characteristics of the tunnel face induced by the shutdown of the EPB shield under various support air pressures and cutter head *** temporal evolution of the accumulated soil masses in the soil chamber and ground responses under different support air pressures,cutter head types and opening ratios are *** particular,the associated surface subsidence due to the tunnel face collapse is determined and compared with empirical *** results confirm the applicability of the 3D MPM for simulating the large-scale tunnel face collapse scenarios,spanning from small to large deformation analysis.

关键词： Large deformation Material point method Partially filled chamber Post-failure mechanism Shield tunnel Tunnel face collapse