检索结果-南通市图书馆

高温热处理对c/c复合材料组织结构和拉伸性能的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

西安工业大学学报 2024年第4期44卷 424-431页

作者：钮超贾建刚伏芳杏潘子康兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室/材料科学与工程学院兰州730050 上海大学材料科学与工程学院上海200444

为了缓解c/c复合材料的脆性,使用自制的热梯度化学气相沉积(TG-cVI)设备对单向碳纤维预制体进行致密化,制备得到致密的c/c复合材料。通过高温热处理调节界面的结合强度和基体碳的石墨化程度,利用排水法测试复合材料的密度,万能材料试验... 详细信息

为了缓解c/c复合材料的脆性,使用自制的热梯度化学气相沉积(TG-cVI)设备对单向碳纤维预制体进行致密化,制备得到致密的c/c复合材料。通过高温热处理调节界面的结合强度和基体碳的石墨化程度,利用排水法测试复合材料的密度,万能材料试验机测试其拉伸性能,采用可视化石墨烯片层技术(VGT)对试样进行处理,使用偏光显微镜(PLM)、扫描电子显微镜(SEM)、X-射线衍射(XRD)分别研究复合材料的微观组织、界面和断面形貌、以及物相组成。结果表明,在相同沉积条件下,热处理后的c/c复合材料碳基体的石墨化程度提高,界面结合强度下降,拉伸性能下降。但复合材料最初的脆性断裂向拟延性转变,延伸率提高。

关键词： c/c复合材料高温热处理热解碳基体拉伸性能

丙类管理和疫苗接种策略下南京市水痘流行特征

在线全文

学校读者我要写书评

暂无评论

中华疾病控制杂志 2024年第4期28卷 393-401页

作者：马涛丁松宁陈聪严子康汪君君王恒学胡洋顾润晖丁洁刘慧慧南京市疾病预防控制中心急性传染病防制科南京210003 常州市武进区疾病预防控制中心免疫规划科常州213100 江苏省疾病预防控制中心江苏省现场流行病学培训项目南京210009 中国疾病预防控制中心教育培训处北京102206

目的了解实施丙类管理和疫苗接种策略后,南京市水痘流行特征变化,初步分析防控措施效果,为改进防控策略提供科学依据。方法收集2013―2022年南京市水痘报告病例数据,利用Joinpoint回归模型分析报告发病率年度变化百分比(annual percent ... 详细信息

目的了解实施丙类管理和疫苗接种策略后,南京市水痘流行特征变化,初步分析防控措施效果,为改进防控策略提供科学依据。方法收集2013―2022年南京市水痘报告病例数据,利用Joinpoint回归模型分析报告发病率年度变化百分比(annual percent change,APc)和平均年度变化百分比(average annual percent change,AAPc)。利用R 4.2.0软件分析时间、人群和空间分布特征,探测空间聚集区域,比较水痘纳入丙类管理(2017―2018年)和疫苗接种后(2019―2022年)流行特征变化。结果共报告水痘病例87538例,年均报告发病率为102.20/10万。2018年达到峰值228.64/10万(19057例),后持续下降至2022年的98.32/10万(9262例),下降了57.00%。2013―2018年、2018―2022年APc分别为71.47%(95%cI:41.96%~107.10%)、-15.36%(95%cI:-35.20%~10.54%),2013―2022年AAPc为25.29%(95%cI:11.03%~41.37%)。2019―2022年病例年龄中位数[10(5,19)岁]高于2017―2018年[7(5,15)岁](P<0.001);<15岁各年龄组发病率下降比例为57.46%~90.46%,年龄组发病高峰被削平。学生、幼托儿童和散居儿童占比由84.53%逐年下降至75.26%,其中幼托儿童由32.51%下降至28.85%,散居儿童由11.13%下降至5.55%。主城区报告发病率低于周边地区,采取疫苗接种策略后,一级聚集区由建邺、江北、雨花台、江宁区,转换为高淳区(均P<0.001)。结论水痘纳入丙类管理提高了南京市水痘监测质量,通过实施扩大免疫接种策略,报告发病水平显著下降,人群和空间分布特征发生变化。

关键词：水痘发病趋势流行病学特征空间聚集性防控策略

单侧双通道内镜下(UBE-TLIF)与微创经椎间孔腰椎融合术(MIS-TLIF)治疗退变性腰椎椎管狭窄症的疗效比较

在线全文

学校读者我要写书评

暂无评论

生物骨科材料与临床研究 2024年第2期21卷 32-37页

作者：周毅陈日高于开凡廖子康成都中医药大学附属医院骨科四川成都610032

目的比较单侧双通道内镜下经椎间孔腰椎椎间融合术(unilateral biportal endoscopic transforaminal lumbar interbodyfusion,UBE-TLIF)与微创经椎间孔入路腰椎椎间融合术(minimal invasive transforaminal lumbar interbody fusion, MIS-TLIF)治疗单节段退行性腰椎椎管狭窄症的疗效。方法回顾性分析2021年1月至2021年12月成都中医药大学附属医院符合纳入标准的68例单节段退行性腰椎椎管狭窄症患者的临床资料,按手术方式分为UBE-TLIF组(27例)与MIS-TLIF组(41例)。对比两组患者的手术相关指标(手术时间、术中出血量、术后引流量、术后住院天数、并发症发生率等);实验室检查结果[全血c反应蛋白(c-reactive protein, cRP)、血清磷酸肌酸激酶(creatine kinase, cK)]及临床疗效评价[腰痛及下肢疼痛视觉模拟评分(visual analogue scale,VAS)、Oswestry功能障碍指数(Oswestry disability index, ODI)、改良MacNab标准评价优良率、Brantigan标准评价椎间融合率]等。结果 68例患者均获得随访,随访时间12~20个月。与MIS-TLIF组相比,UBE-TLIF组患者的手术时间、住院时间更长,但术中出血量、术后引流量更短(P0.05);术后3 d UBE-TLIF组全血c反应蛋白含量较MIS-TLIF组低(P0.05),术后各时间点上述评分均较术前显著下降(P0.05)。并发症方面:UBE-TLIF组无并发症发生,MIS-TLIF组发生并发症2例,包括术后切口感染1例及术后下肢麻木1例,两组间并发症发生率比较,差异无统计学意义(P>0.05)。结论 UBE-TLIF手术方式可达到与MIS-TLIF手术方式相似的术后腰痛疼痛评分、腿疼痛评分、功能障碍指数,且较MIS-TLIF肌肉损伤释放的cK更少、组织出血量更少、术后恢复更快。

关键词：单侧双通道内镜微创腰椎间融合单节段腰椎椎管狭窄

Direct Patterning of carbon Nanotube via Stamp contact Printing Process for Stretchable and Sensitive Sensing Devices

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2019年第4期11卷 619-629页

作者： Binghao Liang Zian Zhang Wenjun c.en Dongwei Lu Leilei Yang Rongliang Yang Hai Zhu zikang Tang Xuchun Gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275People’s Republic of China State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Institute of Applied Physics and Materials engineering University of MacaoAvenida da UniversidadeTaipaMacaoPeople’s Republic of China

Flexible and wearable sensing devices have broad application prospects in bio-monitoring such as pulse measurement,motion detection and voice *** recent years,many significant improvements had been made to enhance the sensor’s performance including sensitivity,flexibility and ***,it is still extremely complicated and difficult to prepare a patterned sensor directly on a flexible ***,inspired by typography,a lowcost,environmentally friendly stamping method for the mass production of transparent conductive carbon nanotube(cNT)film is *** this dry transfer strategy,a porous cNT block was used as both the seal and the ink;and Ecoflex film was served as an object *** cNT patterns can be easily fabricated on the polymer substrate by engraving the target pattern on the cNT seal before the stamping ***,the cNT film can be directly used to fabricate ultrathin(300μm)strain *** strain sensor possesses high sensitivity with a gauge factor(GF)up to 9960 at 85%strain,high stretchability(>200%)and repeatability(>5000 cycles).It has been used to measure pulse signals and detect joint motion,suggesting promising application prospects in flexible and wearable electronic devices.

关键词： carbon nanotube Strain sensor Dry transfer Stamp contact printing process

Ultrathin, Lightweight, and Flexible cNT Buckypaper enhanced Using MXenes for Electromagnetic Interference Shielding

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第4期13卷 208-220页

作者： Rongliang Yang Xuchun Gui Li Yao Qingmei Hu Leilei Yang Hao Zhang Yongtao Yao Hui Mei zikang Tang State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Sc.ence and Technology on Thermostructural composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China Instrumental Analysis and Research center(IARc) Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Sc.ence and Technology on Advanced composites in Special environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China Institute of Applied Physics and Materials engineering University of MacaoTaipa 999078MacaoPeople’s Republic of China

Lightweight,flexibility,and low thickness are urgent requirements for next-generation high-performance electromagnetic interference(EMI)shielding materials for catering to the demand for smart and wearable electronic *** several efforts have focused on constructing porous and flexible conductive films or aerogels,few studies have achieved a balance in terms of density,thickness,flexibility,and EMI shielding effectiveness(SE).Herein,an ultrathin,lightweight,and flexible carbon nanotube(cNT)buckypaper enhanced using MXenes(Ti3c2Tx)for high-performance EMI shielding is synthesized through a facile electrophoretic deposition *** obtained Ti3c2Tx@cNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100μ*** hybrid buckypaper with an MXene content of 49.4 wt%exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15μm,which is 105%higher than that of pristine cNT ***,an average specific SE value of 5.7×10^(4) dB cm^(2) g^(−1) is exhibited in the 5-μm hybrid ***,this assembly process proves promising for the construction of ultrathin,flexible,and high-performance EMI shielding films for application in electronic devices and wireless communications.

关键词： carbon nanotube MXene Buckypaper Electromagnetic interference shielding

One step synthesis of effic.ent red emissive carbon dots and their bovine serum albumin composites with enhanced multi-photon fluorescence for in vivo bioimaging

在线全文

学校读者我要写书评

暂无评论

Light(Sc.ence & Applications) 2022年第5期11卷 955-968页

作者： Huiqi Zhang Gang Wang Zhiming Zhang Josh Haipeng Lei Tzu-Ming Liu Guichuan Xing chu-Xia Deng zikang Tang Songnan Qu Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China Institute of Translational Medicine Faculty of Health SciencesUniversity of MacaoMacao 999078China MoE Frontiers Sc.ence center for Precision Oncology University of MacaoMacao 999078China cancer center Faculty of Health SciencesUniversity of MacaoMacao 999078China

Effic.ent red emissive carbon dots(cDs)in aqueous solutions are very scarce for high performance bioimaging *** this work,we report a one-step solvothermal treatment to synthesize pure red emissive cDs(FA-cDs)from citric acid and urea in formic acid without complicated purification *** quantum yield(PLQY)of 43.4%was observed in their dimethyl sulfoxide *** PLQY up to 21.9%in aqueous solutions was achieved in their bovine serum albumin(BSA)composites(FA-cDs@BSA)with significantly enhanced multiphoton *** strong surface electron-withdrawing structure of FA-cDs caused by the high content of c=O groups contributes for their pure red *** to the significantly enhanced single and multi-photon red fluorescence and enlarged particle sizes after composing with BSA,in vivo tumor imaging and two-photon fluorescence imaging of blood vessels in mouse ear have been realized via intravenous injection of FA-cDs@BSA aqueous solutions.

关键词： photon pure synthesis

基于多元国土空间整治情景模拟的生态系统服务功能分区

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

农业工程学报 2021年第22期37卷 262-270页

作者：周子康刘殿锋武汉大学资源与环境科学学院武汉430079

生态系统服务功能分区是科学管理生态系统的重要手段。国土空间整治能够通过综合治理闲置、低效和生态退化国土资源,改变国土空间结构与布局,从而对生态系统功能产生影响。现有研究较少关注土地整治措施对未来生态系统服务空间集聚模式... 详细信息

生态系统服务功能分区是科学管理生态系统的重要手段。国土空间整治能够通过综合治理闲置、低效和生态退化国土资源,改变国土空间结构与布局,从而对生态系统功能产生影响。现有研究较少关注土地整治措施对未来生态系统服务空间集聚模式的潜在影响作用,整治措施的生态导向性有待提升。因此,该研究以山东招远市为例,设计了基准情景、废弃矿区修复情景以及城乡建设用地整治情景,定量化预测生态系统服务变化特征,并运用模糊c均值聚类算法开展生态系统功能区划定。结果表明,整治情景下土地利用数量结构变化显著,各生态系统服务能力均有所提升。全域可以划分为生态综合区、生境保育区、固碳释氧区、固碳产粮区、生态维护区5个生态功能区。与基准情景相比,废弃矿区修复情景下各生态功能区60%生态系统服务水平持平,28%处于劣势,仅12%显著提升。城乡建设用地整治则能够显著提升全域自然娱乐能力,总体增长了1.89%。生境保育区的自然娱乐和粮食生产能力平均值分别增加了0.01和0.10,固碳释氧区的生境质量、水源涵养能力分别增长了20.69%和100%。研究表明全面提升生态系统多功能性需要综合开展多元的国土空间整治措施。

关键词：土地利用整治生态系统服务生态功能分区 FcM聚类

controlling sulfurization of 2D Mo_(2)c crystal for Mo_(2)c/MoS_(2)-based memristor and artificial synapse

在线全文

学校读者我要写书评

暂无评论

npj Flexible Electronics 2022年第1期6卷 917-924页

作者： Xin Tang Leilei Yang Junhua Huang Wenjun c.en Baohua Li Shaodian Yang Rongliang Yang Zhiping Zeng zikang Tang Xuchun Gui State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Department of physics Guangxi Minzu UniversityNanning 530006China School of Electronic Information engineering Foshan UniversityFoshan 528000P.R.China School of Materials Sc.ence and engineering Sun Yat-sen UniversityGuangzhou 510275China Institute of Applied Physics and Materials engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China

Owing to the conductance-adjustable performance,the emerging two-terminal memristors are promising candidates for artificial synapses and brain-spired neuromorphic *** memristors based on molybdenum disulfide(MoS_(2))have displayed outstanding performance,such as thermal stability and high energy effic.ency,reports on memristors based on MoS_(2) as the functional layer to simulate synaptic behavior are ***,a homologous Mo_(2)c/MoS_(2)-based memristor is prepared by partially sulfuring two-dimensional Mo_(2)c *** memristor shows good stability,excellent retention(~104 s)and endurance(>100 cycles),and a high ON/OFF ratio(>10^(3)).Moreover,for comprehensively mimicking biological synapses,the essential synaptic functions of the device are systematically analyzed,including paired-pulse facilitation(PPF),short-term plasticity(STP),long-term plasticity(LTP),long-term depression(LTD),and the transitions from STP to ***,this artificial synapse could keep a highlevel stable memory for a long time(60 s)after repeated *** results prove that our device is highly desirable for biological synapses,which show great potential for application in future high-density storage and neuromorphic computing systems.

关键词： artificial sulfur stability

Synergistically boosting the elementary reactions over multiheterogeneous ordered macroporous Mo2c/Nc-Ru for highly effic.ent alkaline hydrogen evolution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

carbon energy 2022年第5期4卷 856-866页

作者： Kaixi Wang Shuo Wang Kwan San Hui Haixing Gao Duc Anh Dinh c.engzong Yuan c.enyang Zha Zongping Shao zikang Tang Kwun Nam Hui Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipaMacao SARChina School of engineering Faculty of ScienceUniversity of East AngliaNorwichUK NTT Hi-Tech Institute Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam State Key Laboratory of Materials-Oriented chemical engineering College of Chemical EngineeringNanjing Tech UniversityNanjingChina WA School of Mines:Minerals Energy and Chemical Engineering(WASM-MECE)Curtin UniversityPerthWestern AustraliaAustralia

Simultaneously enhancing the reaction kinetics,mass transport,and gas release during alkaline hydrogen evolution reaction(HER)is critical to minimizing the reaction polarization resistance,but remains a big *** rational design of a hierarchical multiheterogeneous three-dimensionally(3D)ordered macroporous Mo_(2)c-embedded nitrogen-doped carbon with ultrafine Ru nanoclusters anchored on its surface(OMS Mo_(2)c/Nc-Ru),we realize both electronic and morphologic.engineering of the catalyst to maximize the electrocatalysis *** formed Ru-Nc heterostructure shows regulative electronic states and optimized adsorption energy with the intermediate H*,and the Mo_(2)c-Nc heterostructure accelerates the Volmer reaction due to the strong water dissociation ability as confirmed by theoretical ***,superior HER activity in alkaline solution with an extremely low overpotential of 15.5 mV at 10 mAcm^(−2)with the mass activity more than 17 times higher than that of the benchmark Pt/c,an ultrasmall Tafel slope of 22.7 mV dec−1,and excellent electrocatalytic durability were achieved,attributing to the enhanced mass transport and favorable gas release process endowed from the unique OMS Mo_(2)c/Nc-Ru *** oxidizing OMS Mo_(2)c/Nc-Ru into OMS MoO_(3)-RuO_(2)catalyst,it can also be applied as effic.ent oxygen evolution electrocatalyst,enabling the construction of a quasi-symmetric electrolyzer for overall water *** a device's performance surpassed the state-of-the-art Pt/c||RuO2 *** study provides instructive guidance for designing 3D-ordered macroporous multicomponent catalysts for effic.ent catalytic applications.

关键词： heterostructure hydrogen evolution reaction molybdenum carbide ordered macroporous structure ruthenium nanoparticle synergistic effect