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Highly efficient H-bonding charge-transfer complex for microsupercapacitors under extreme conditions of low temperatures

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Journal of Energy Chemistry 2020年第12期29卷 182-189页

作者： Libin Wang Ting Shu Songtao Guo shi Chen yingjun Jiang Xianluo Hu State Key Laboratory of Materials Processing and Die Sf Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Owing to sluggish ionic mobility at low temperatures, supercapacitors, as well as other energy-storage devices, always suffer from severe capacity decay and even failure under extreme low-temperature circumstances. Solar-thermal-enabled self-heating promises an attractive approach to overcome this ***, we report a unique H-bonding charge-transfer complex with a high photothermal conversion efficiency of 79.5% at 405 nm based on chloranilic acid and albendazole. Integrated with a microsupercapacitor, the chloranilic acid-albendazole complex(CAC) film prompts an apparent temperature increase of 22.7 °C under 1 sun illumination at-32.6 °C, effectively elevating the working temperature of *** a result, the rate capability of the microsupercapacitor has been significantly improved with a 17-fold increase in capacitance at a current density of 60 μA cm^(-2), leading to outstanding low-temperature performances. Importantly, the integrated device is capable of working at a low temperature of-30 °C in the open air, which demonstrates the potential of CAC in practical applications for low-temperature ultracapacitive energy-storage devices.

关键词： Charge-transfer complexes Solar-thermal conversion Extreme conditions Microsupercapacitors Low temperature

Hydrothermal growth of whitlockite coating on β-tricalcium phosphate surfaces for enhancing bone repair potential

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Journal of Materials Science & Technology 2018年第6期34卷 1054-1059页

作者： Xiaoheng Guo Xiao Liu Huichang Gao Xuetao shi Naru Zhao yingjun Wang School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China Notional Engineering Research Centre for Tissue Restoration and Reconstruction Guangzhou 510006 China Guangdong Province Key Laboratory of Biomedical Engineering South China University of Technology Guangzhou 510006 China school of Medicine South China University of Technology Guangzhou 510006 China

In this study, we developed a simple approach for the controllable growth of whitlockite （WH） on a β- tricalcium phosphate surface and investigated its cell viability via CCK-8, its live-dead staining and its alkaline phosphatase activity. Herein, WH with controllable morphologies was prepared by regulating the hydrothermal reaction conditions. The results of scanning electron microscopy, X-ray diffraction and X- ray photoelectron spectroscopy indicated that pure hexagonal plates of WH were prepared successfully. In vitro cell experiments showed that WH possessed excellent biocompatibility and effectively promoted the adhesion and proliferation of mouse bone mesenchymal stem cells. The osteogenesis of the WH was also enhanced. The obtained WH was expected to be utilized for promising applications as implantable block materials for bone repair.

关键词： Surface Whitlockite Hydrothermal reaction Bone repair

慢性阻塞性肺病急性加重期患者有创-无创序贯通气最佳切换时机的临床研究

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中国实用医刊 2019年第20期46卷 10-13页

作者：赵玉良刘雅文赵云史为涛李之海时迎俊江苏省徐州市第一人民医院重症医学科 221002

目的探讨慢性阻塞性肺病急性加重期(AECOPD)患者有创-无创序贯通气最佳切换时机.方法抽取2016年8月至2018年1月徐州市第一人民医院ICU收治的AECOPD患者60例,按随机信封法分为对照组和观察组,每组30例.对照组以常规感染控制窗为序贯机械... 详细信息

目的探讨慢性阻塞性肺病急性加重期(AECOPD)患者有创-无创序贯通气最佳切换时机.方法抽取2016年8月至2018年1月徐州市第一人民医院ICU收治的AECOPD患者60例,按随机信封法分为对照组和观察组,每组30例.对照组以常规感染控制窗为序贯机械通气切换点,观察组以改良感染控制窗为序贯通气切换点.比较两组患者呼吸机肺炎(VAP)、再插管/达到再插管水平及相关指标情况.结果观察组VAP发生率为6.67%(2/30),对照组为26.67%(8/30),观察组VAP发生率低于对照组(χ^2=4.320,P=0.038).观察组再插管/达到再插管水平发生率为10.00%(3/30),低于对照组[13.33%(4/30),χ^2=0.162,P=0.688].观察组有创通气时间、总通气时间、ICU住院时间低于对照组(t=9.159、3.506、6.322,P=0.000、0.001、0.000).观察组院内病死率为0,低于对照组(χ^2=4.286,P=0.038).结论改良感染控制窗结合多项辅助指标判断序贯通气切换时机,可在保证脱机成功的基础上降低VAP发生率,减少并发症,缩短有创通气时间、总通气时间及ICU住院时间,减少并发症.

关键词：慢性阻塞性肺病,急性加重期机械通气,有创-无创序贯感染控制窗

1999-2016年天山西部植被覆盖的时空变化

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水土保持通报 2018年第4期38卷 301-307页

作者：朱雅丽施英俊张绘芳地力夏提.包尔汉张景路梁雪梅雷亚君新疆林业科学院现代林业研究所新疆乌鲁木齐830000 兵团林业管理总站新疆乌鲁木齐830000

[目的]调查天山西部生态环境植被覆盖状况,为科学保护区域生态环境和管理提供科学依据。[方法]以天山西部林区—霍城林场为研究对象,基于1999,2007和2016年3个时期的Landsat TM遥感影像和DEM数据,运用归一化植被指数分析研究区植被覆盖... 详细信息

[目的]调查天山西部生态环境植被覆盖状况,为科学保护区域生态环境和管理提供科学依据。[方法]以天山西部林区—霍城林场为研究对象,基于1999,2007和2016年3个时期的Landsat TM遥感影像和DEM数据,运用归一化植被指数分析研究区植被覆盖情况和空时变化特征。[结果]时间变化上,1999—2016年期间霍城林场植被覆盖以Ⅱ和Ⅲ级为主,所占比重达到55%以上,总体上是呈现上升趋势;空间分布上,霍城林场因海拔、坡度和坡向等地形因子的不同而出现不同的分布和变化特征,当海拔在1 500~2 000m和2 000~2 500m或者坡度30°~45°的区域时,植被覆盖度相对较高;当海拔2 500m或坡度半阴坡>半阳坡>阳坡的分布特征;当海拔2 500m和坡度>45°的区域时,因受人为社会活动影响小,植被覆盖变化不明显。[结论]1999—2016年期间,霍城林场植被覆盖在时间变化上总体呈现上升趋势,在空间分布上因海拔、坡度和坡向等地形因子的不同呈现不同的分布和变化特征。

关键词：植被覆盖度霍城林场归一化植被指数地形因子

血液透析血管通路护理质量评价指标体系的构建

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中华现代护理杂志 2024年第5期30卷 604-609页

作者：陈林张颖君李巧刘莉石梅四川大学华西医院肾脏内科血透中心/四川大学华西护理学院成都610041

目的构建血液透析血管通路护理质量评价指标体系,为血管通路质量评价和改进提供参考依据。方法借助Donabedian三维结构质量评价工具,结合文献检索法、半结构式访谈和德尔菲法,以电子邮件、微信等方式发送专家咨询表,对来自全国9个省、... 详细信息

目的构建血液透析血管通路护理质量评价指标体系,为血管通路质量评价和改进提供参考依据。方法借助Donabedian三维结构质量评价工具,结合文献检索法、半结构式访谈和德尔菲法,以电子邮件、微信等方式发送专家咨询表,对来自全国9个省、直辖市的血液透析血管通路领域的临床护理、护理管理、医疗工作的15名专家进行2轮函询,确定评价指标体系。专家积极程度采用问卷有效回收率表示,专家意见协调程度采用协调系数和变异系数表示,专家权威程度采用专家权威系数表示。结果2轮专家函询的问卷有效回收率均为100.00%(15/15);专家咨询的判断依据系数为0.900,熟悉程度系数为0.827,权威系数为0.864,一、二、三级指标的协调系数分别为0.280、0.267、0.206、(P<0.05)。最终构建的血液透析血管通路护理质量评价指标体系包括3个一级指标、11个二级指标、39个三级指标。结论血液透析血管通路护理质量评价指标体系设置合理,构建过程严谨,具有较高的科学性和可靠性,可为血液透析血管通路护理质量评价提供客观、可量化的参考依据。

关键词：血液透析血管通路护理质量评价指标德尔菲法

Data-Driven Structural Design Optimization for Petal-Shaped Auxetics Using Isogeometric Analysis

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Computer Modeling in Engineering & Sciences 2020年第2期122卷 433-458页

作者： yingjun Wang Zhongyuan Liao Shengyu shi Zhenpei Wang Leong Hien Poh National Engineering Research Center of Novel Equipment for Polymer Processing the Key Laboratory of Polymer Processing Engineering of the Ministry of Education(South China University of Technology)Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSouth China University of TechnologyGuangzhou510641China. Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)1 Fusionopolis Way138632Singapore. Department of Civil and Environmental Engineering National University of Singapore 1 Engineering Drive 2E1A 07-03117576Singapore

Focusing on the structural optimization of auxetic materials using data-driven methods,a back-propagation neural network(BPNN)based design framework is developed for petal-shaped auxetics using isogeometric *** a NURBSbased parametric modelling scheme with a small number of design variables,the highly nonlinear relation between the input geometry variables and the effective material properties is obtained using BPNN-based fitting method,and demonstrated in this work to give high accuracy and *** BPNN-based fitting functions also enable an easy analytical sensitivity analysis,in contrast to the generally complex procedures of typical shape and size sensitivity approaches.

关键词： Data-driven BP neural network petal-shaped auxetics negative Poisson’s ratio structural design isogeometric analysis.

Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectric properties

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Nano Research 2018年第2期11卷 741-750页

作者： Weigang Ma yingjun Liu Shen Yan Tingting Miao Shaoyi shi Zhen Xu Xing Zhang Chao Gao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou China Department of Thermal Engineering Tsinghua University Beijing China Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation Engineering China University of Petroleum-Beijing Beijing China

Flexible wearable electronics, when combined with outstanding thermoelectric properties, are promising candidates for future energy harvesting systems. Graphene and its macroscopic assemblies （e.g., graphene-based fibers and films） have thus been the subject of numerous studies because of their extraordinary electrical and mechanical properties. However, these assemblies have not been considered suitable for thermoelectric applications owing to their high intrinsic thermal conductivity. In this study, bromine doping is demonstrated to be an effective method for significantly enhancing the thermoelectric properties of graphene fibers. Doping enhances phonon scattering due to the increased defects and thus decreases the thermal conductivity, while the electrical conductivity and Seebeck coefficient are increased by the Fermi level downshift. As a result, the maximum figure of merit is 2.76 ~ 10~, which is approximately four orders of magnitude larger than that of the undoped fibers throughout the temperature range. Moreover, the room temperature power factor is shown to increase up to 624 btW.m-l.K-2, which is higher than that of any other material solely composed of carbon nanotubes and graphene. The enhanced thermoelectric properties indicate the promising potential for graphene fibers in wearable energy harvesting systems.

关键词： macroscopic graphene fiber bromine doping thermoelectric properties thermal conductivity electrical conductivity Seebeck coefficient

How to build good inverters from nanomaterial-based transistors

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Nano Research 2023年第11期16卷 12594-12600页

作者： Pengkun Sun Nan Wei Panpan Zhang yingjun Yang Maguang Zhu Huiwen shi Lian-Mao Peng Zhiyong Zhang Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics School of ElectronicsPeking UniversityBeijing 100871China

As promising components of future integrated circuits(ICs),field-effect transistors(FETs)based on semiconducting nanomaterials are being extensively *** the most essential component of ICs,inverters are favored to be demonstrated at the infant stage of emerging ***,systematic research is absent to reveal how the parameters of transistors affect the performance of inverters,*** voltage transfer characteristics(VTCs).In this work,systematic analysis about the dependency between transistor-and inverter-level metrics have been carried out for both complementary metal-oxide-semiconductor(CMOS)and monotype(p-type-only and n-type-only)technologies,which is further experimentally demonstrated by carbon nanotube FETs and *** also propose guidelines towards the high noise margin and rail-to-rail inverter design based on nanomaterials.

关键词： field-effect transistors inverter voltage transfer characteristics noise margin nanomaterial

Systematic characterization of transport and thermoelectric properties of a macroscopic graphene fiber

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Nano Research 2016年第11期9卷 3536-3546页

作者： Weigang Ma yingjun Liu Shen Yan Tingting Miao Shaoyi shi Mincheng Yang Xing Zhang Chao Gao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou 310027 China Department of Thermal Engineering Tsinghua University Beijing 100084 China Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation Engineering China University ot Petroleum Beijing Beijing 102249 China

Graphene, a two-dimensional material with extraordinary electrical, thermal, and elastic performance, is a potential candidate for future technologies. However, the superior properties of graphene have not yet been realized for graphenederived macroscopic structures such as graphene fibers. In this study, we systematically investigated the temperature （T ）-dependent transport and thermoelectric properties of graphene fiber, including the thermal conductivity （A）, electrical conductivity （o）, and Seebeck coefficient （S）. A increases from 45.8 to 149.7 W·m^-1·K^-1 and then decreases as T increases from 80 to 290 K, indicating the boundary-scattering and three-phonon Umklapp scattering processes. σ increases with T from 7.1 × 10^4 to 1.18 × 10^5 S·m^-1, which can be best explained by the hopping mechanism. S ranges from -3.9 to 0.8 μV·K^-1 and undergoes a sign transition at approximately 100 K.

关键词： macroscopic graphene fiber thermoelectric properties thermal conductivity electrical conductivity Seebeck coefficient