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Sandwiching Sulfur into the Dents Between N,O Co-Doped Graphene Layered Blocks with Strong Physicochemical Confinements for Stable and High-Rate Li-S Batteries

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Nano-Micro Letters 2020年第11期12卷 13-24页

作者： Mengjiao Shi Su Zhang Yuting jiang zimu jiang Longhai Zhang Jin Chang Tong Wei Zhuangjun Fan Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China Key Laboratory of Energy Materials Chemistry Ministry of EducationKey Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryXinjiang UniversityUrumqi 830046People’s Republic of China State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580People’s Republic of China

The development of lithium-sulfur batteries(LSBs)is restricted by their poor cycle stability and rate performance due to the low conductivity of sulfur and severe shuttle ***,an N,O co-doped graphene layered block(NOGB)with many dents on the graphene sheets is designed as effective sulfur host for high-performance LSB *** sulfur platelets are physically confined into the dents and closely contacted with the graphene scaffold,ensuring structural stability and high *** highly doped N and O atoms can prevent the shuttle effect of sulfur species by strong chemical ***,the micropores on the graphene sheets enable fast Li^+transport through the *** a result,the obtained NOGB/S composite with 76 wt%sulfur content shows a high capacity of 1413 mAh g^-1 at 0.1 C,good rate performance of 433 mAh g^-1 at 10 C,and remarkable stability with 526 mAh g^-1 at after 1000 cycles at 1 C(average decay rate:0.038%per cycle).Our design provides a comprehensive route for simultaneously improving the conductivity,ion transport kinetics,and preventing the shuttle effect in LSBs.

关键词： Graphene Physicochemical confinement Cycle stability Shuttle effect Li-S batteries

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Effect of ultramicropores and inner space of carbon materials on the capacitive sodium storage performance

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Journal of Energy Chemistry 2022年第10期31卷 35-40,I0002页

作者： zimu jiang Su Zhang Jing Feng Yuting jiang Shichuan Liang Qiqi Li Mengjiao Shi Meng Cao Mingyi Zhang Tong Wei Zhuangjun Fan Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830046XinjiangChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580ShandongChina

*** Carbon materials have been widely investigated as the anode materials for Na+storage due to their moderate capacity,good stability,and low *** Na+storage mechanisms of carbon are generally classified into diffusio... 详细信息

关键词： Graphene block Ultramicropores Na^(+)storage Electrochemical kinetic

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基于Matlab的无人机通信信道模型的设计

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航空兵器 2019年第5期26卷 69-76页

作者：夏进姜子木王成华朱秋明南京航空航天大学

电磁波传播的信道环境是复杂多样的,在传输过程中总伴随有路径损耗、阴影效应、多径效应和多普勒效应等,影响电磁波的传输效果。基于无人机通信性能的测试需求和现有SoS信道模型,对信道的功率谱形状与频率、增益间的关系进行分析,得到... 详细信息

电磁波传播的信道环境是复杂多样的,在传输过程中总伴随有路径损耗、阴影效应、多径效应和多普勒效应等,影响电磁波的传输效果。基于无人机通信性能的测试需求和现有SoS信道模型,对信道的功率谱形状与频率、增益间的关系进行分析,得到一种可实现时变衰落特性改进的SoS信道模型,并通过Matlab进行了仿真验证。最后,给出了FPGA实现该改进模型的系统结构。该改进信道模型具有一定的实用价值。

关键词： SoS模型路径损耗阴影效应多径效应多普勒效应

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钢箱系杆拱桥在高速铁路荷载下的节点疲劳分析

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高速铁路技术 2024年第4期15卷 40-44,105页

作者：李烨姜子慕大连市市政设计研究院有限责任公司辽宁大连116021 辽宁省市政工程设计研究院有限责任公司沈阳110000

为研究钢箱系杆拱桥应力集中节点在高速铁路荷载下的疲劳性能,本文依托某高速铁路钢箱系杆拱桥工程,采用有限元软件ANSYS建立全桥简化模型,并对两处应力极值位置建立精细化局部模型。通过规范评价和疲劳理论评价对精细化局部模型中应力... 详细信息

为研究钢箱系杆拱桥应力集中节点在高速铁路荷载下的疲劳性能,本文依托某高速铁路钢箱系杆拱桥工程,采用有限元软件ANSYS建立全桥简化模型,并对两处应力极值位置建立精细化局部模型。通过规范评价和疲劳理论评价对精细化局部模型中应力集中节点进行了疲劳分析。研究结果表明本桥各应力节点均满足疲劳性要求,且评价结果远优于限值。

关键词：高速铁路节点疲劳分析有限元模拟

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火星地表障碍物对电磁波传播损耗的研究及仿真

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航空兵器 2019年第2期26卷 62-68页

作者：姜子木夏进王成华朱秋明南京航空航天大学电子信息工程学院南京210016

针对传统电磁波传播模型不适用于火星特殊的传播环境问题,对火星表面不同障碍物对电磁波的影响进行研究及仿真。根据一致性绕射原理,分别研究了几种火星地表典型的障碍物对电磁波传播的影响,并对每种地表物质特性进行分析。同时运用两... 详细信息

针对传统电磁波传播模型不适用于火星特殊的传播环境问题,对火星表面不同障碍物对电磁波的影响进行研究及仿真。根据一致性绕射原理,分别研究了几种火星地表典型的障碍物对电磁波传播的影响,并对每种地表物质特性进行分析。同时运用两种不同数学计算模型来仿真结果,再运用三维射线跟踪法模拟真实火星地表进行仿真,最后将三者结果进行对比分析。仿真结果表明,不同方法的预测结果相似度较高,可将仿真数据根据实际情况作为火星地表无线通信系统设计的参考依据之一。

关键词：火星地表环境传播损耗一致性绕射三维射线跟踪

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脑卒中后瘫痪肢体肌肉萎缩和失神经支配研究进展

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中华神经科杂志 2020年第12期53卷 1063-1067页

作者：蒋自牧梁嘉辉黎建乐陈椿勇李苹萍魏佳婷曾进胜中山大学附属第一医院神经科广东省重大神经疾病诊治研究重点实验室广州510080

一般认为,脑卒中后瘫痪肢体肌萎缩是废用性的。但新近研究发现,卒中病灶对侧脊髓前角运动神经元继发性损害,运动单位减少,导致肌肉失神经支配,在肌萎缩和肌纤维类型改变中起重要作用。本文就脑卒中后瘫痪肢体肌肉萎缩和失神经支配的现... 详细信息

一般认为,脑卒中后瘫痪肢体肌萎缩是废用性的。但新近研究发现,卒中病灶对侧脊髓前角运动神经元继发性损害,运动单位减少,导致肌肉失神经支配,在肌萎缩和肌纤维类型改变中起重要作用。本文就脑卒中后瘫痪肢体肌肉萎缩和失神经支配的现象和发生机制进行综述,为临床评估和机制研究提供参考。

关键词：脑卒中失神经支配肌萎缩继发性损害

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脑梗死累及岛叶预示心源性栓塞性卒中风险

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中国神经精神疾病杂志 2024年第2期50卷 76-81页

作者：黄宝资黎建乐李苹萍曹谡涵陈椿勇蒋自牧曾进胜中山大学附属第一医院神经科广东省重大神经疾病诊治研究重点实验室国家临床重点专科和国家重点学科广州510080 广西医科大学第一附属医院神经内科

目的探讨在大脑中动脉供血区脑梗死患者中,病灶累及岛叶是否与心源性栓塞性卒中存在相关性。方法回顾性纳入2020年10月至2023年3月中山大学附属第一医院和广西医科大学第一附属医院卒中中心收治的发病7 d内的大脑中动脉供血区脑梗死... 详细信息

目的探讨在大脑中动脉供血区脑梗死患者中,病灶累及岛叶是否与心源性栓塞性卒中存在相关性。方法回顾性纳入2020年10月至2023年3月中山大学附属第一医院和广西医科大学第一附属医院卒中中心收治的发病7 d内的大脑中动脉供血区脑梗死患者。卒中病因分型分为心源性栓塞型和非心源性栓塞型。病灶是否累及岛叶主要通过磁共振弥散加权成像(DWI)进行确诊。采用单因素和多因素logistic回归分析探讨累及岛叶的脑梗死与心源性栓塞性卒中之间的相关性。结果共纳入大脑中动脉供血区脑梗死患者1585例,其中心源性栓塞型173例(10.9%)和非心源性栓塞型1412例(89.1%)。脑梗死累及岛叶448例(28.3%),其中心源性栓塞组135例(78.0%)和非心源性栓塞组313例(22.2%)。单因素logistic回归分析提示累及岛叶的脑梗死与心源性栓塞性卒中存在相关性(未调整模型:OR=12.474, 95%CI 8.520~18.263,P<0.001)。在调整潜在混杂因素后,两者间仍存在显著相关性(模型3:OR=6.233, 95%CI 3.688~10.543;P<0.001)。此外,累及左侧(模型3:OR=4.977, 95%CI 2.757~8.987,P<0.001)和右侧岛叶的脑梗死(模型3:OR=4.998,95%CI 2.743~9.107,P<0.001)均与心源性栓塞性卒中存在相关性。结论大脑中动脉供血区脑梗死累及岛叶可作为心源性栓塞性卒中的潜在影像学标志。

关键词：岛叶受累心源性栓塞性卒中大脑中动脉供血区脑梗死影像学标志相关性风险非心源性栓塞性卒中

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Flow Loss Mechanism in a Supercritical Carbon Dioxide Centrifugal Compressor at Low Flow Rate Conditions

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Journal of Thermal Science 2024年第1期33卷 114-125页

作者： YANG zimu jiang Hongsheng ZHUGE Weilin CAI Ruikai YANG Mingyang CHEN Haoxiang QIAN Yuping ZHANG Yangjun State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

With the advantages of high efficiency and compact structure,supercritical carbon dioxide(sC02)Brayton cycles have bright prospects for development in energy conversion *** one of the core components of the power cycle,the centrifugal compressor tends to operate near the critical point(304.13 K,7.3773 MPa).Normally,the compressor efficiency increases as the inlet temperature *** the inlet temperature is close to the critical point,the density increases sharply as the temperature decreases,which results in quickly decreasing of volume flow rate and efficiency *** flow loss mechanism of the sCO_(2) compressor operating at low flow rate is studied in this *** fluid dynamics(CFD) simulations for sCO_(2)compressor were carried out at various inlet temperatures and various mass flow *** the sCO_(2)compressor operates at low volume flow rate,the flow loss is generated mainly on the suction side near the trailing edge of the *** flow loss is related to the counterclockwise vortexes generated on the suction side of the main *** vortexes are caused by the flow separation in the downstream region of the impeller passage,which is different from air compressors operating at low flow *** reason for this flow separation is that the effect of Coriolis force is especially severe for the sCO_(2) fluid,compared to the viscous force and inertial *** lower flow rates,with the stronger effect of Coriolis force,the direction of relative flow velocity deviates from the direction of radius,resulting in its lower radial *** lower radial relative flow velocity leads to severe flow separation on the suction side near the trailing edge of the main blade.

关键词： supercritical CO_(2) centrifugal compressor flow loss mechanism Coriolis force

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Investigation on Precooling Effects of 4 K Stirling-Type Pulse Tube Cryocoolers

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Journal of Thermal Science 2019年第4期28卷 714-726页

作者： CAO Qiang LI zimu LUAN Mingkai SUN Zheng TANG Xiao LI Peng jiang Zhenhua WEI Li Institute of Refrigeration and Cryogenics School of Mechanical EngineeringTongji UniversityShanghai 201804China Shanghai Key Laboratory of Vehicle Aerodynamics and Vehicle Thermal Management Systems Tongji UniversityShanghai 201804China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China Department of Electrical Engineering School of Electronics and Information EngineeringTongji UniversityShanghai 201804China

Stirling-type pulse tube cryocoolers(SPTCs)working at liquid-helium temperatures are appealing in space applications because of their promising advantages such as high reliability,compactness,*** efforts have been put in to develop SPTCs operating at liquid-helium temperatures especially with helium-4 as the working *** structure is essential to reach such low ***,both the regenerator of the last section and the pulse tube together with the phase shifter are precooled by its upper stage or by external cold source to a low temperature of around 20 ***,the precooling effects on the regenerator and the pulse tube are synthetic in previous studies,and their independent effects have not been studied *** this manuscript,the precooling effects on the regenerator and on the pulse tube together with the phase shifter are tested independently on a unique-designed precooled *** tested precooling temperature is between 13.3 K and 22 K,and the no-load refrigeration temperature gets down to 3.6 *** analyses and numerical calculations have been carried *** is found that the influence on the regenerator is remarkable,which is different from previous *** is also found that the precooling effects on the pulse tube are relatively weak because of the large pressure-induced enthalpy flow of a real gas working at the temperatures near to the critical ***,the phase shifting capacity is analyzed with two cases and with both helium-4 and helium-3 as working fluids,and it keeps quite constant after optimizing the frequency and the precooling temperature for each *** investigation on these independent effects will provide valid reference on the precooling mechanism study of SPTCs working down to liquid-helium temperatures.

关键词： stirling-type pulse tube cryocooler precooling effects liquid-helium temperatures

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Cholesterol transport through the peroxisome-ER membrane contacts tethered by PI（4,5）P2 and extended synaptotagmins

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Science China(Life Sciences) 2019年第9期62卷 1117-1135页

作者： Jian Xiao Jie Luo Ao Hu Ting Xiao Meixin Li Zekai Kong Luyi jiang zimu Zhou Yacheng Liao Chang Xie Beibei Chu Honghua Miao Boliang Li Xiongjie Shi Bao-Liang Song College of Life Sciences the Institute for Advanced StudiesWuhan UniversityWuhan 430072China State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Shenzhen Institute of Wuhan University Shenzhen 518057China

Most mammalian cells take up cholesterol from low-density lipoproteins(LDLs) via receptor-mediated *** reaching lysosomes,LDL-derived cholesterol continues to transport to downstream organelles including the ER for specific structural and functional *** are recently found to receive cholesterol from lysosomes through lysosomeperoxisome membrane ***,whether and how cholesterol is conveyed from peroxisomes to the ER remain ***,by combining high-resolution microscopic analyses and in vitro reconstitution of highly purified organelles or artificial liposomes,we demonstrate that peroxisomes form membrane contacts with the ER through the interaction between peroxisomal PI(4,5)P2 and ER-resident extended synaptotagmin-1,2 and 3(E-Syts).Depletion of peroxisomal PI(4,5)P2 or ESyts markedly decreases peroxisome-ER membrane contacts and induces cholesterol accumulation in ***,we show that cholesterol is delivered from 3H-labeled peroxisomes or PI(4,5)P2-containing liposomes to the ER in vitro,and that the presence of peroxisomes augments cholesterol transfer from lysosomes to the ***,our study reveals a new cholesterol transport pathway along the lysosome-peroxisome-ER membrane contacts in the cell.

关键词： Peroxisome ER membrane contacts E-Syts PI(4,5)P2

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