检索结果-内蒙古大学图书馆

The research on RSS filter for indoor positioning system based on wireless LANs

Advances in Information Sciences and Service Sciences 2011年第4期3卷 1-9页

作者： Ren, Gao Yongxiang, Zhao Long, Tang School of Electronic Information of Wuhan University Hubei University of Economics State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan University

Recently, indoor positioning technology based on received signal strength in wireless networks are becoming more and more attractive. In this paper, we firstly introduced the experimental testbed in a typical office building. Then, we proposed the mechanism to improve the positioning accuracy by using five different filtering methods because of harsh multi-path environment and all kinds of disturbance in indoor areas. Thirdly, the experimental parameters of five filtering methods, called Limit Filter, Threshold Filter, Max Filter, MA Filter and Kalman Filter, were optimized and analyzed. Finally, we summarized the five filtering methods, and compared the performance of Limit Filter, Threshold Filter and Max Filter in detail. Experimental results demonstrated that the proposed Limit Filter andThreshold Filter can increase the accuracy in 3 meters of 91% to 98%.

关键词： Kalman filters

来源：评论

学校读者我要写书评

暂无评论

Room temperature growing the Kagomé net Pillared crystal structure of metal-organic frameworks

Room temperature growing the Kagomé net Pillared crystal st...

引用

The 3rd International Congress on advanced materials（AM2016）

作者： Kui Zhou Somboon Chaemchuen Zhaoxuan Wu Francis Verpoort School of Materials Science and Engineering Wuhan University of Technology State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The rapid synthesis of Kagomé net layer pillared metal organic frameworks(MOFs) structure at room temperature was developed. Although this MOF series [M(bdc)(dabco)] varies in metal center(M= Co, Ni, Zn), the structure remains [the MOF is denoted as MBD;M = metal(Co, Ni, Zn);B = bdc(1,4-bicarboxylic acid);D = dabco(1,4-diazabicyclo[2.2.2]octane)]. The Kagomé net pillared structures are determined using comparable XRD patterns and confirmed by SEM. N adsorption isotherms at 77 K are used to evaluate their surface area and porosity properties. Furthermore, the gas uptake analyses(CO, CH and N) were measured at different temperatures and pressure up to 1 bar. Additionally, the heats of adsorption behavior of CO are given by fitting the isotherms with Dual-site Langmuir equations. Finally, the CO/CH and CO/N selectivities are determined by Ideal Adsorbed Solution Theory(IAST) to evaluate the gas separation properties of these materials.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Julolidine functionalized benzimidazoline-doped fullerene derivatives for efficient and stable perovskite solar cells

引用

Interdisciplinary materials 2024年第3期3卷 369-379页

作者： Yanqing Zhu Chenglong Li JiaHui Chen Yuxi Zhang Jianfeng Lu Min Hu Wangnan Li Fuzhi Huang Yi-Bing Cheng Hyesung Park Shengqiang Xiao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhanChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Electronic and Electrical Engineering Hubei Province Engineering Research Centre for Intelligent Micro-Nano Medical Equipment and Key TechnologiesWuhan Textile UniversityWuhanChina Hubei Key Laboratory of Low Dimensional Optoelectronic Material and Devices Hubei University of Arts and ScienceXiangyangHubeiChina KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea Department of Integrative Energy Engineering Korea UniversitySeoulRepublic of Korea Hubei Key Laboratory of Fuel Cell WuhanChina

Fullerene derivatives are highly attractive materials in solar cells,organic thermoelectrics,and other ***,the intrinsic low electron mobility and electrical conductivity restrict their potential device performance,such as perovskite solar cells(PSCs).Herein,we successfully enhanced the electric properties and morphology of phenyl-C61-butyric acid methyl ester(PCBM)by n-doping it with a benzimidazoline derivative,9-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)-julolidine(JLBI-H)via a solution *** found the n-doping can not only improve the conductivity and optimize the band alignment but also enable the PCBM to have a constantly strong charge extraction ability in a wide temperature from 173 to 373 K,which guarantees a stable photovoltaic performance of the corresponding PSCs under a wide range of operating *** the JLBI-H-doped PCBM,we improved the efficiency from 17.9%to 19.8%,along with enhanced stability of the nonencapsulated devices following the aging protocol of ISOS-D-1.

关键词： charge extraction electron mobility n-doping PSCs wide operation temperature

来源：评论

学校读者我要写书评

暂无评论

Combustion behavior and flame retardation mechanism of epoxy resins blended with basic magnesium carbonate

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第4期30卷 19-22+102页

作者： Qin, Lin-Qing Liu, Yi-Bo Huang, Zhi-Xiong Zhang, Lian-Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Center for Material Research and Analysis Wuhan University of Technology Wuhan 430070 China School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China

In this paper the inflaming retarding effects of epoxy resins blended with basic magnesium carbonate [Mg(OH)2·4MgCO3·5H2O] were synthesized. When the add-on of basic magnesium carbonate reached 56.5%, the LOI of the epoxy resins increased to 29.7%. The flame retardant mechanisms of basic magnesium carbonate for epoxy resins was investigated by XRD, TG-DSC and SEM. Results showed that through the ways of diluting, cooling, isolating and their synergies, basic magnesium carbonate achieves the flame retarding target.

关键词： Basic magnesium carbonate Epoxy resin Flame retardation mechanism Inflaming behavior

来源：评论

学校读者我要写书评

暂无评论

Flexible and highly-sensitive pressure sensor based on controllab.y oxidized MXene

引用

InfoMat 2022年第9期4卷 60-71页

作者： Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices&International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyanChina Center for Nanoscale Characterization&Devices(CNCD) Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)WuhanChina Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure *** the inevitable oxidation of solution-processed MXene has been recognized,the effect of the irreversible oxidation of MXene on its electrical conductivity and sensing properties is yet to be ***,we construct a highly-sensitive and degradable piezoresistive pressure sensor by coating Ti_(3)C_(2)T_(x)MXene flakes with different degrees of in situ oxidation onto paper substrates using the dipping-drying *** situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene *** partially oxidized MXene-based piezoresistive pressure sensor exhibits a high sensitivity of 28.43 kPa^(-1),which is greater than those of pristine MXene,over-oxidized MXene,and state-of-the-art paper-based pressure ***,these sensors exhibit a short response time of 98.3 ms,good durability over 5000 measurement cycles,and a low force detection limit of 0.8 ***,MXene-based sensing elements are easily degraded and environmentally *** MXene-based pressure sensor shows promise for practical applications in tracking body movements,sports coaching,remote health monitoring,and human–computer interactions.

关键词： adjustable sensitivity in situ oxidation interlayer distance MXene pressure sensor

来源：评论

学校读者我要写书评

暂无评论

Thermoelectric properties on Zn+ ion implantation into polycrystalline lead telluride

引用

materials Science Forum 1999年 308-311卷 704-710页

作者： Zhang, L. Li, J. Wang, G. Li, J. Ye, M. State Key Lab. of Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Physics Wuhan University Wuhan 430072 China

PbTe is a useful thermoelectric material for the design of functionally graded materials (FGM) thermoelectric device. Since the maximum figure of merit shifts in a wide temperature range depending upon carrier concentration, the stepwise carrier concentration FGM of PbTe is expected to attain high efficiency of thermoelectric energy conversion. In order to improve the carrier concentration profile, 110 KeV Zn+ ions were implanted into n-type PbTe samples. X-ray diffraction (XRD) has been used to examine the effect of ions implantation on the structure of PbTe. By varying the ion dose it is possible to investigate the Zn-PbTe phase relationship, and the effect of forming a joint boundary on the thermoelectric properties of PbTe. Electrical resistance and Hall coefficient measurements have also been carried out as a function of implantation dose at room temperature.

关键词： Lead compounds

来源：评论

学校读者我要写书评

暂无评论

A novel high accuracy indoor positioning system based on wireless lans

引用

Progress In Electromagnetics Research C 2011年 24卷 25-42页

作者： Zhao, Y.X. Shen, Q. Zhang, L.M. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Bafang Logistics Fuzhou University Fuzhou 350108 China

A novel indoor positioning system based on received signal strength (RSS) in wireless networks with high accuracy is presented in this paper. The three improvement mechanisms, called signal strength filter, user location filter and path tracking assistance, are employed to improve the positioning accuracy of the system. The comprehensive performance of the proposed system is analyzed in detail and compared with the Radar system. Experimental results demonstrate that the proposed system in this paper can improve 80% accuracy in 3 meters of Radar system to 93% in typical office building testbed. Therefore, the indoor positioning system presented in this paper has the advantages of high accuracy, low cost and easy expansibility, and it can be used to locate people and assets in the fields of logistics, healthcare, and manufacturing.

关键词： Indoor positioning systems

来源：评论

学校读者我要写书评

暂无评论

Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

引用

Journal of materials Science & technology 2021年第24期83卷 179-187页

作者： Hemdan S.H.Mohamed Mohamed Rabia Xian-Gang Zhou Xu-Sen Qin Gomaa Khabiri Mohamed Shaban Hussein A.Younus S.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed Schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

来源：评论

学校读者我要写书评

暂无评论

Pressure-driven metallization with significant changes of structural and photoelectric properties in two-dimensional EuSbTe_(3)

引用

Rare Metals 2024年第11期43卷 5943-5952页

作者： Zhi-Kai Zhu Zhong-Yang Li Zhen Qin Yi-Ming Wang Dong Wang Xiao-Hui Zeng Fu-Yang Liu Hong-Liang Dong Qing-Yang Hu Ling-Ping Kong Hao-Zhe Liu Wen-Ge Yang Yan-Feng Guo Shuai Yan Xuan Fang Wei He Gang Liu State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materialsand School of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai 201203China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Poly Technologies INCBeijing 100010China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Sch Sci State Key Lab High Power Semicond LasersChangchun University Science and TechnologyChangchun 130022China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China

Two-dimensional materials are widely considered to be highly promising for the development of *** improve the performance of these devices,researchers often employ techniques such as defect ***,pressure is employed as a clean and novel means to manipulate the structural and physical properties of EuSbTe_(3),an emerging two-dimensional *** experimental results demonstrate that the structural phase transformation of EuSbTe_(3)occurs under pressure,with an increase in infrared reflectivity,a band gap closure,and a metallization at *** with X-ray diffraction(XRD)and Raman characterizations,it is evident that the pressure-driven transition from semiconductor Pmmn phase to metallic Cmcm phase causes the disappearance of the charge density ***,at a mild pressure,approximately 2 GPa,the maximum photocurrent of EuSbTe_(3)is three times higher than that at ambient condition,suggesting an untapped potential for various practical applications.

关键词： Pressure Phase transition Metallization Photoresponse Two-dimensional(2D)

来源：评论

学校读者我要写书评

暂无评论

Planar metasurface‑based concentrators for solar energy harvest:from theory to engineering

引用

PhotoniX 2022年第1期3卷 38-72页

作者： Cheng Zhang Yujie Zhan Yongxue Qiu Leilei Xu Jianguo Guan Hubei Engineering Research Center of RF‑Microwave Technology and Application School of ScienceWuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Solar energy is an inexhaustible renewable energy resource,which is a potential solution to global warming and aids sustainable *** use of solar-thermal collectors to harness solar energy facilitates low-cost heat storage and can improve the stability of power grids based on renewable *** solar-thermal collectors,traditional concentrators,such as parabolic troughs and dishes,are typically used but inevitably require high-precise supports and complex tracking sun systems,which increase the cost of solar-thermal power stations and hinder their further *** contrast,planar meta-lenses(so-called metasurface-based concentrators)consisting of two-dimensional nanostructured arrays are allowed to engineer the frequency dispersion and angular dispersion of the incident light through delicately arranging the aperture phase distribution,thereby correcting their inherent ***,the novel meta-lenses offer tremendous potentials to effectively capture broadband,wide-angle sunlight without the extra tracking *** review summarizes the research motivation,design principles,building materials,and large-area fabrication methods of meta-lens for solar energy harvesting in terms of focusing efficiency,operation bandwidth,and angular *** addition,the main challenges and future goals are examined.

关键词： Solar-thermal collector Metasurface Concentrator Solar energy harvesting

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：