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P(VDF-HFP)-poly(sulfur-1,3-diisopropenylbenzene) functional polymer electrolyte for lithium–sulfur batteries

Journal of Energy Chemistry 2020年第7期29卷 114-122,I0004页

作者： jiang-Hui jiang An-Bang wang Wei-Kun wang Zhao-Qing Jin Li-Zhen Fan Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Military Power Sources Research and Development Center Research Institute of Chemical DefenseBeijing 100191China

Lithium–sulfur(Li–S)battery as a high-energy density electrochemical energy storage system has attracted many researchers’***,the shuttle effect of Li–S batteries and the challenges associated with lithium metal anode caused poor cycle *** this work,the organosulfide poly(sulfur-1,3-diisopropenylbenzene)(PSD)was prepared as cathode material and additive of P(VDFHFP)polymer electrolyte(P(VDF-HFP)).It was verified that P(VDF-HFP)polymer electrolyte with 10%PSD(P(VDF-HFP)-10%PSD)showed a higher ionic conductivities than that of liquid electrolyte up to2.27×10-3 S cm-1 at room *** quasi-solid-state Li-S batteries fabricated with organosulfide cathode material PSD and P(VDF-HFP)based functional polymer electrolyte delivered good cycling stability(780 m Ah g-1 after 200 th cycle at 0.1 C)and rate performance(613 m Ah g-1 at 1 C).The good cycling performance could be attributed to the synergistic effect of components,including the interaction between polysulfides and polymer main chain in the organosulfide cathode,the sustained organic/inorganic hybrid stable SEI layer formed by polymer electrolyte additive PSD,the improved cathode/electrolyte interface and the good affinity between P(VDF-HFP)based functional polymer electrolyte and Li metal *** strategy herein may provide a new route to fabricate high-performance Li–S batteries through the organosulfide cathode and functional polymer electrolyte.

关键词： Organosulfide cathode Functional polymer electrolyte Stable SEI layer Quasi-solid-state Li–S batteries

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多带笼目超导体CsV_(3)Sb_(5)衍生体系的可调磁通涡旋束缚态

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Science Bulletin 2024年第7期69卷 885-892页

作者：黄子豪韩相和赵振刘锦锦李鹏飞谭恒心王秩伟姚裕贵杨海涛颜丙海蒋坤胡江平汪自强陈辉高鸿钧 Beijing National Center for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Department of Condensed Matter Physics Weizmann Institute of ScienceRehovot 7610001Israel Hefei National Laboratory Hefei 230088China Department of Physics Boston CollegeChestnut Hill MA 02467USA

Vortices and bound states offer an effective means of comprehending the electronic properties of ***,surface-dependent vortex core states have been observed in the newly discovered kagome superconductors CsV_(3)Sb_(5).Although the spatial distribution of the sharp zero energy conductance peak appears similar to Majorana bound states arising from the superconducting Dirac surface states,its origin remains *** this study,we present observations of tunable vortex bound states(VBSs)in two chemically-doped kagome superconductors Cs(V_(1-x)Tr_(x))_(3)Sb_(5)(Tr=Ta or Ti),using low-temperature scanning tunneling microscopy/*** CsV_(3)Sb_(5)-derived kagome superconductors exhibit full-gap-pairing superconductivity accompanied by the absence of long-range charge orders,in contrast to pristine CsV_(3)Sb_(5).Zero-energy conductance maps demonstrate a field-driven continuous reorientation transition of the vortex lattice,suggesting multiband *** Ta-doped CsV_(3)Sb_(5)displays the conventional cross-shaped spatial evolution of Caroli-de Gennes-Matricon bound states,while the Tidoped CsV_(3)Sb_(5)exhibits a sharp,non-split zero-bias conductance peak(ZBCP)that persists over a long distance across the *** spatial evolution of the non-split ZBCP is robust against surface effects and external magnetic field but is related to the doping *** study reveals the tunable VBSs in multiband chemically-doped CsV_(3)Sb_(5)system and offers fresh insights into previously reported Y-shaped ZBCP in a non-quantum-limit condition at the surface of kagome superconductor.

关键词： Kagome superconductor Chemical doping Vortex lattice transition Vortex bound states Majorana bound states

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A meta-analysis of the long-term effects of chronic pancreatitis surgical treatments： duodenum-preserving pancreatic head resection versus pancreatoduodenectomy

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Chinese Medical Journal 2013年第1期126卷 147-153页

作者： LU Wen-ping SHI Qing ZHANG Wen-zhi CAI Shou-wang jiang Kai DONG Jia-hong Department of Hepatobiliary Surgery Chinese People's LiberationArmy General Hospital Beijing 100853 China Department of Microbiology Peking University Health ScienceCenter Beijing 100191 China

Background Surgery is regarded as the most effective treatment to relieve pain and reduce complications in chronic pancreatitis （CP）. Two major strategies exist： duodenum-preserving pancreatic head resection （DPPHR） and pancreatoduodenectomy （PD）. Many studies suggest that DPPHR offers advantages during surgery and in the short-term; however, the long-term effects have not been thoroughly investigated. We analyzed the long-term outcomes of DPPHR and PD, over follow-up times of at least 1 year, to determine the optimal surgical treatment for CP. Methods We systemically reviewed all CP surgical treatment reports, and only included randomized controlled trials （RCT） comparing DPPHR and PD, excluding unqualified studies using several pre-specified criteria. When multiple publications of a single trial were found, the most comprehensive current data were selected. Characteristics of the study populations and long-term postoperative outcome parameters were collected. The quality of the studies and data was analyzed using RevMan 4.2 software. Results Five trials were qualified for meta-analysis, with 261 participants in total （114 in the DPPHR group and 147 in the PD group）. There were no significant differences in the age, gender, or indications for surgery of each group. At the mean of 5.7-year （1-14 years） follow-up examination, DPPHR and PD resulted in equally effective pain relief, exocrine and endocrine function, and similar mortality rates （P 〉0.05）; however, DPPHR patients had improved global quality of life and weight gain, and reduced diarrhea and fatigue （P 〈0.05）. Conclusion DPPHR and PD result in equal pain relief, mortality, and pancreatic function; however, DPPHR provides superior long-term outcomes.

关键词： chronic pancreatitis surgical treatments long-term postoperative effect meta-analysis

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局部增强切片对3D打印FDM模型弯曲强度的影响

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工程塑料应用 2024年第3期52卷 91-96页

作者：王琛蒋旻翰张晨赟夏凌然丁可青南京林业大学家居与工业设计学院南京210037

为了提高熔融沉积(FDM)3D打印模型的弯曲强度和比强度,通过Cura软件局部增强切片功能对聚乳酸(PLA)试样的中心区域进行了加强,使用FDM工艺制作了8组试样(包含0#参考组和1#~7#增强组),对各组试样进行三点弯曲实验,对比不同增强切片参数下... 详细信息

为了提高熔融沉积(FDM)3D打印模型的弯曲强度和比强度,通过Cura软件局部增强切片功能对聚乳酸(PLA)试样的中心区域进行了加强,使用FDM工艺制作了8组试样(包含0#参考组和1#~7#增强组),对各组试样进行三点弯曲实验,对比不同增强切片参数下PLA试样的弯曲强度和比强度。结果表明,随着局部增强填充密度的增大,PLA试样的弯曲强度先增大后减小;随着局部增强填充走线乘数的增大,PLA试样的弯曲强度逐渐增大;随着局部增强挤出倍率的增大,PLA试样的弯曲强度逐渐增大;与0#参考组相比,局部增强填充密度60%、局部增强填充走线乘数3、局部增强挤出倍率120%三种方式下PLA试样的比强度分别提高了16%,13%和5%,通过局部增强填充密度方式产生的比强度提升效果最好。因此,对于常规切片参数为填充密度20%、填充走线乘数1、挤出倍率100%的FDM模型,将局部增强区域填充密度设置为60%可以有效提高其弯曲强度和比强度。

关键词：局部增强切片熔融沉积模型弯曲强度

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景观格局对河流水质影响的尺度效应Meta分析

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环境科学 2024年第5期45卷 2631-2639页

作者：王玉仓杜晶晶张禹吴昊胡敏鹏陈丁江浙江大学环境与资源学院杭州310058 环境修复与生态健康教育部重点实验室杭州310058 浙江省农业资源与环境重点实验室杭州310058

景观格局决定了陆域污染物的源汇过程,是影响河流水质状况的关键因素.由于尺度效应,不同尺度下景观格局与河流水质关系的研究结果不尽相同.然而,景观格局对河流水质影响的尺度效应问题尚缺乏系统研究.收集了国内外4041条研究数据,采用M... 详细信息

景观格局决定了陆域污染物的源汇过程,是影响河流水质状况的关键因素.由于尺度效应,不同尺度下景观格局与河流水质关系的研究结果不尽相同.然而,景观格局对河流水质影响的尺度效应问题尚缺乏系统研究.收集了国内外4041条研究数据,采用Meta分析法定量分析了不同尺度下景观格局对河流水质的作用特征,识别了影响河流水质的关键时间和空间尺度以及景观指数.结果表明,相对于降水事件、平水期和年际尺度,丰水期下景观格局对河流水质的影响最大;相对于流域尺度,缓冲区尺度的景观格局对河流水质的影响更大;丰水期-缓冲区尺度是景观格局影响河流水质的关键时空耦合尺度.与耕地、水域、草地以及流域整体景观相比,林地和城镇用地的景观格局对河流水质的影响更大;破碎度是影响河流水质最重要的景观格局因子.在河流水质治理中,应重点考虑缓冲区的景观配置,增加缓冲区林地面积、减少林地和水域的斑块密度和减少城镇用地的面积占比和聚集度,以有效保护河流水质.

关键词：景观格局河流水质尺度效应破碎度土地利用

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Comparative study of model tests on automatically formed roadway and gob-side entry driving in deep coal mines

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International Journal of Mining Science and Technology 2021年第4期31卷 591-601页

作者： Qi wang Manchao He Shucai Li Zhenhua jiang Yue wang Qian Qin Bei jiang State Key Laboratory for Geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China Research Institute of Deep Underground Science and Engineering China University of Mining and Technology-BeijingBeijing 100083China Research Center of Geotechnical and Structural Engineering Shandong UniversityJinan 250061China Shandong Tianqin Mining Machinery Equipment Co. LtdYuncheng 274700China

Automatically formed roadway(AFR)by roof cutting with bolt grouting(RCBG)is a new deep coal mining *** using this technology,the broken roadway roof is strengthened,and roof cutting is applied to cut off stress transfer between the roadway and gob to ensure the collapse of the overlying *** roadway is automatically formed owing to the broken expansion characteristics of the collapsed strata and mining *** the Suncun Coal Mine as the engineering background,the control effect of this new technology on roadways was *** compare the law of stress evolution and the surrounding rock control mechanisms between AFR and traditional gob-side entry driving,a comparative study of geomechanical model tests on the above methods was carried *** results showed that the new technology of AFR by RCBG effectively reduced the stress concentration of the roadway compared with gob-side entry *** side abutment pressure peak of the solid coal side was reduced by 24.3%,which showed an obvious pressure-releasing ***,the position of the side abutment pressure peak was far from the solid coal side,making it more beneficial for roadway *** deformation of AFR surrounding rock was also smaller than the deformation of the gob-side entry driving by the overload *** former was more beneficial for roadway stability than the latter under higher stress *** application tests showed that the new technology can effectively control roadway ***,the technology reduced roadway excavation and avoided resource waste caused by reserved coal pillars.

关键词： Automatically formed roadway Roof cutting Bolt grouting Roadway control Model test

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咸阳市2018-2022年柯萨奇A组16型病毒序列分析

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病毒学报 2024年第2期40卷 418-423页

作者：王士峰秦龙李珍妮王丽娟张丹霞蒋宇婷咸阳市疾病预防控制中心咸阳712000

本研究旨在了解咸阳市2018-2022年手足口病(Hand, foot and mouth disease, HFMD)病原柯萨奇A组16型(Coxsackievirus A16, CV-A16)基因进化特征,为HFMD防控策略制定提供依据。首先分析2018-2022年咸阳市HFMD监测数据,再选取部分CV-A16阳性样本进行RT-PCR扩增VP1基因序列,测序后进行系统进化和序列相似性分析。2018-2022年咸阳市CV-A16阳性确诊病例共计402例,占实验室确诊病例总数的28.69%(402/1401)。VP1序列系统进化分析显示选取的54条CV-A16 VP1均为B1基因亚型,25条属B1a型,29条属B1b型。2018-2020年以B1b型为主,而2021-2022年主要为B1a型。氨基酸序列相似性分析表明,B1a型序列存在T164K(25/25)、I251V(25/25)和A22T(3/25)三处突变,而B1b型主要有N14S(9/29)和I235V(6/29)突变。CV-A16为咸阳市2018年、2019年、2021年和2022年HFMD主要致病原之一,2021年后优势毒株可能已由B1b型转化为B1a型,将来应加强CV-A16基因型动态监测。

关键词：手足口病柯萨奇病毒A组16型 VP1序列进化分析

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基于GEE和Sentinel-2影像的杭州城市湿地精细化分类研究

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北京师范大学学报（自然科学版） 2024年第3期60卷 447-458页

作者：潘宸侯浩唐伟蒋卫国王品胡潭高杭州师范大学遥感与地球科学研究院浙江杭州浙江省城市湿地与区域变化研究重点实验室浙江杭州浙江省测绘科学技术研究院浙江杭州北京师范大学地理科学学部北京

基于Google Earth Engine(GEE)云平台,使用Sentinel-2卫星影像数据,采用随机森林算法面向杭州城市湿地类型进行遥感分类研究.研究结果表明:在进行湿地类型精细化分类时,相比于使用单一特征信息分类,多特征信息的组合可以显著提高分类精... 详细信息

基于Google Earth Engine(GEE)云平台,使用Sentinel-2卫星影像数据,采用随机森林算法面向杭州城市湿地类型进行遥感分类研究.研究结果表明:在进行湿地类型精细化分类时,相比于使用单一特征信息分类,多特征信息的组合可以显著提高分类精度,最优特征组合包括传统光谱特征、红边光谱特征、变换特征、纹理特征和地形特征,其总体精度为81.2%,Kappa系数为0.75;不同特征信息对于不同湿地类型的提取具有重要作用,传统光谱特征对于滩地和养殖池的识别非常有利,而红边光谱特征和变换特征分别对草本沼泽和湖泊的识别更为有效.此外,红边光谱特征和纹理特征的组合有利于运河/水渠的识别.通过特征对比实验可为湿地精细化分类的案例研究提供参考,湿地分类结果可为杭州城市湿地信息的遥感识别提供数据支撑.

关键词： Google Earth Engine(GEE)云平台 Sentinel-2影像随机森林算法湿地精细化分类

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爆炸冲击波作用下板架结构响应研究综述

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兵器装备工程学报 2024年第3期45卷 151-160页

作者：王琰蒋海燕韩璐苏健军杨峰西安近代化学研究所西安710065

板架结构是飞机和水面舰艇主要的组成单元,研究其在爆炸冲击波作用下的变形和破坏对目标结构的防护设计具有重要意义。国内外学者对板架结构在冲击波载荷作用下的变形与破坏进行了大量研究,形成了诸多成果。本文中从理论分析、实验研究... 详细信息

板架结构是飞机和水面舰艇主要的组成单元,研究其在爆炸冲击波作用下的变形和破坏对目标结构的防护设计具有重要意义。国内外学者对板架结构在冲击波载荷作用下的变形与破坏进行了大量研究,形成了诸多成果。本文中从理论分析、实验研究和数值模拟3个方面总结了爆炸冲击波载荷作用下板架结构响应领域的研究现状,并对未来研究方向提出一些建议,为相关结构的抗爆设计以及战时毁伤评估提供参考。

关键词：爆炸载荷板架结构动力响应研究综述

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Biliary spontaneous dislodgement spiral stent for short-term biliary drainage in patients undergoing complete stone removal:A randomized controlled study

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Chinese Medical Journal 2024年第11期137卷 1363-1365页

作者： Liansong Ye Lifan Zhang Yi Mou Xianglei Yuan Wei Liu Chuncheng Wu Yonghong Luo jiang Du Shuai Bai Jia Xie Qiongying Zhang Qinghua Tan Ling Liu Bing Hu Department of Gastroenterology and Hepatology West China HospitalMed-X Center for MaterialsSichuan UniversityChengduSichuan 610041China Digestive Endoscopy Medical Engineering Research Laboratory West China HospitalSichuan UniversityChengduSichuan 610041China West China School of Nursing Sichuan UniversityChengduSichuan 610041China

To the Editor:Endoscopic retrograde cholangiopancreatography(ERCP)is strongly recommended for stone removal of *** there is still risk of complications such as post-ERCP cholangitis(PEC)and post-ERCP pancreatitis(PEP).Biliary drainage including endoscopic nasobiliary drainage(ENBD)and biliary stent is considered to reduce the occurrence of PEC and ***,the ENBD tube will cause patient discomfort,and some patients may extract the tube by ***,additional endoscopic stent removal is required after insertion of conventional biliary stent for short-term biliary drainage,increasing medical costs.

关键词： biliary patients stent

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