检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Qi, Youchao Liu, Guoxu Kuang, Yang Wang, Lu Zeng, Jianhua Lin, Yuan Zhou, Han Zhu, Meiling Zhang, Chi CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China College of Engineering Mathematics and Physical Sciences University of Exeter ExeterEX4 4QF United Kingdom School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Collaborative Innovation Center of Suzhou Nano Science and Technology Xi’an Jiaotong University Xi’an710049 China Center on Nanoenergy Research School of Physical Science and Technology Guangxi University China

Vibrational triboelectric nanogenerators (V-TENG) can be used to harvest broadband vibration energy due to the nonlinear impact force induced by a stopper. However, V-TENGs with a single stopper have limited bandwidth and surface charge density, which has limited their application in wideband vibration energy harvesting. Herein, a V-TENG with two stoppers is proposed for frequency band broadening and charge density enhancement. The theoretical analysis and experimental validation have indicated the V-TENG with two stoppers could improve the bandwidth by 75% compared with one stopper at a gap distance of 0.5 mm. Moreover, a charge pump can be constructed with two output channels, which has improved surface charge density by about 14 times. With the frequency varying from 18 to 38 Hz, the V-TENG can continually power 400 LEDs and charge a commercial capacitor quickly. This work has shown an encouraging method for enhancing the performance of V-TENGs, which also has great prospects in harvesting wideband vibration energy from machines, cars, ships, and human motions for self-powered electronics. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

来源：评论

学校读者我要写书评

暂无评论

Vision Experiments on Chroma-Related Preference for Color Quality of Lighting

引用

Journal of the Illuminating engineering Society 2024年第4期20卷

作者： Yoshi Ohno Jiaye Li Yuki Kawashima Semin Oh a Sensor Science Division Physical Measurement Laboratory National Institute of Standards and Technology Gaithersburg Maryland USA b Department of Informatics Graduate School of Science and Engineering Yamagata University Yonezawa Japan c Department of Psychology School of Arts and Sciences University of Pennsylvania Philadelphia Pennsylvania USA

ABSTRACTTwo vision experiments were conducted to quantify the chroma-related preference in color quality of lighting in a real room-size cubicle simulating interior lighting environment with spectrally tunable light sources. The first experiment used 9 different lights with increased or decreased chroma in nine levels in red-green directions. The second experiment used 11 different lights with increased or decreased chroma in three hue directions, for red, green, and yellow, controlled as independently as possible. About 20 subjects participated in these two experiments evaluating the appearance of various fruits and vegetables as well as skin tone under these test lights by numerous pair comparisons. The results of the first experiment showed that chroma increase in ΔC*ab≈ 4 to 8 from the reference light was most preferred for all target objects, and desaturated lights were disliked in all cases. The second experiment showed that chroma change in red is significantly important for the preference, green was second, and yellow had the least effect on preference. The results of the second experiment suggested that preference increases with increasing red chroma in light, and after a peak in preference (between ΔC*ab≈ 5 to 10), preference starts decreasing, which is consistent with findings from the first experiment. Neither the viewing targets nor the correlated color temperature (CCT) conditions were found to have significant impact on the subjects’ preference.

关键词： Color rendition color preference chroma perception vision experiment

来源：评论

学校读者我要写书评

暂无评论

Electrolyte spraying within H2 bubbles during water electrolysis

arXiv

引用

arXiv 2024年

作者： Bashkatov, Aleksandr Bürkle, Florian Demirkır, Çayan Ding, Wei Sanjay, Vatsal Babich, Alexander Yang, Xuegeng Mutschke, Gerd Czarske, Jürgen Lohse, Detlef Krug, Dominik Büttner, Lars Eckert, Kerstin Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstrasse 400 Dresden01328 Germany Physics of Fluids Group Max Planck Center for Complex Fluid Dynamics MESA+ Institute J. M. Burgers Centre for Fluid Dynamics University of Twente P.O. Box 217 Enschede7500AE Netherlands Laboratory for Measurement and Sensor System Techniques Faculty of Electrical and Computer Engineering Technische Universität Dresden Helmholtzstr. 18 Dresden01069 Germany Max Planck Institute for Dynamics and Self-Organization Am Fassberg 17 Göttingen37077 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Dresden01062 Germany

Electrolytically generated gas bubbles can significantly hamper the overall electrolysis efficiency. Therefore it is crucial to understand their dynamics in order to optimise water electrolyzer systems. Here we demonstrate a distinct transport mechanism where coalescence with microbubbles drives electrolyte droplets, resulting from the fragmentation of the Worthington jet, into the gas phase during hydrogen evolution reaction, both in normal and microgravity environments. This indicates that the H2 bubble is not only composed of hydrogen gas and vapor but also includes electrolyte fractions. Reminiscent of bursting bubbles on a liquid-gas interface, this behavior results in a flow inside the bubble, which is further affected by Marangoni convection at the gas-electrolyte interface, highlighting interface mobility. In the case of electrode-attached bubbles, the sprayed droplets form electrolyte puddles at the bubble-electrode contact area, affecting the dynamics near the three-phase contact line and favoring bubble detachment from the electrode. The results of this work unravel important insights into the physicochemical aspects of electrolytic gas bubbles, integral for optimizing gas-evolving electrochemical systems. Besides, our findings are essential for studying the limits of jet formation and rupture relevant to acid mist formation in electrowinning, generation of sea spray aerosols, impact of droplets on liquid surfaces, etc. © 2024, CC BY.

关键词： Hydrogen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

Investigating the interlayer electron transport and its in?uence on the whole electric properties of black phosphorus

引用

Science Bulletin 2019年第4期64卷 254-260页

作者： Bensong Wan Shaoqiang Guo Jiacheng Sun Yufei Zhang Yuyan Wang Caofeng Pan Junying Zhang Key Laboratory of Micro-nano Measurement Manipulation and Physics (Ministry of Education) School of Physics Beihang University CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science and Technology Guangxi University College of Optoelectronic Engineering Shenzhen University

Two-dimensional(2D) nanomaterials have attracted great attention in next generation electronic and optoelectronic technologies due to the unique layered structure and excellent physical and chemical properties. However, the mechanism of transmission along the vertical direction of 2D semiconductor materials has not been investigated. Here, we use first-principles calculations to explore the bandgap energies along different directions, and fabricate a vertical, a lateral and a mixture-structured black phosphorus field effect transistor(BPFET) to study the electrical characteristics along different directions under variable temperatures. The variable temperature test indicates that the mixture-structured device performs more like a lateral device, while the conductance along the vertical direction is hard to be tuned by temperature and electrical field. The unchanged conductance under electric field and variable temperatures allows the vertical device to act as a fixed resistor, promising possible application for the prospective electronic and optoelectronic devices.

关键词： Black phosphorus Transistor Transmission Vertical Variable temperature

来源：评论

学校读者我要写书评

暂无评论

Scanning Acoustic Microscopy for Quantifying Two-phase Transfer in Operando Alkaline Water Electrolyzer

arXiv

引用

arXiv 2024年

作者： Dou, Zehua Rox, Hannes Ramos, Zyzi Baumann, Robert Ravishankar, Rachappa Czurratis, Peter Yang, Xuegeng Lasagni, Andrés Fabian Eckert, Kerstin Czarske, Juergen Weik, David Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Helmholtzstraße 18 Dresden01069 Germany Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 Dresden01328 Germany PVA TePla Analytical Systems GmbH Deutschordenstraße 38 Westhausen73463 Germany Institute of Manufacturing Science and Engineering Technische Universität Dresden George-Baehr-Straße 3c Dresden01069 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Helmholtzstraße 14 Dresden01069 Germany Hydrogen Lab School of Engineering Technische Universität Dresden Helmholtzstraße 14 Dresden01062 Germany Institute for Emerging Electronic Technologies Leibniz Institute for Solid State and Materials Research Dresden Helmholtzstraße 20 Dresden01069 Germany

Improved understandings of two-phase transport in electrochemical gas-evolving systems are increasingly demanded, while high-performance imaging techniques using simplified instrumentations are not readily available. This work presents volumetric scanning acoustic microscopy (SAM) imaging for quantifying the dynamics of gas bubbles and electrolyte in porous Nickel electrodes with different wettability and structures during alkaline water electrolysis (AWE). We realize high-resolution 3D imaging at 10's µm level using high frequency spherically focused ultrasound. The high resolution allowed us to clearly visualize the spatial distributions of produced bubbles in the porous electrodes over time. Moreover, we are able to quantify the residual gas volume in an electrode and its coverage due to bubble evolution, which dominate its transport overpotential. Taking these advantages, we elucidate the impacts of electrodes' wettability and structures on their electrolysis performance, on a regular laboratory base. The obtained knowledge provides us important optimization guidelines of AWE designs and operating schemes. Copyright © 2024, The Authors. All rights reserved.

关键词： Mass transfer

来源：评论

学校读者我要写书评

暂无评论

Hand Gesture Recognition based on Electrical Impedance Tomography measurements using Genetic Algorithms

Hand Gesture Recognition based on Electrical Impedance Tomog...

引用

Impedance Spectroscopy (IWIS), International Workshop on

作者： Mariem Hafsa Bilel Ben Atitallah Taha ben Salah Najoua Essoukri Ben Amara Olfa Kanoun LATIS- Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Ecole Nationale d'Ingénieurs de Sousse Sousse Tunisie Professorship of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany University of Sfax National School of Engineers of Sfax Sfax Tunisia University of Sousse National Engineering School of Sousse Sousse Tunisia

Electrical Impedance Tomography (EIT) for gesture recognition is on the rise in the bio-medical field. It is an imaging technique based on a set of electrodes which are placed on the forearm of the individual. The inner conductivity distribution inside the forearm will be calculated based on measured boundary voltages resulting of the injected excitation signal. In this work, the Genetic Algorithm, using the Non-Blind Search has been developed as a solution for the EIT Inverse Problem. Therefore, several measurements have been conducted for American sign numbers (0-9) for gesture recognition applications. The reconstructed images were used in a Convolutional Neural Network (CNN) classification algorithm for gesture recognition. The overall accuracy achieved for image recognition was 93%.

关键词： Electrical impedance tomography Spectroscopy Voltage measurement Inverse problems Gesture recognition Search problems Classification algorithms

来源：评论

学校读者我要写书评

暂无评论

Erratum:Growth of TlBa2Ca2Cu3O9 Epitaxial Thin Films by Two-Step Method in Argon[***.36(2019)057401]

引用

Chinese Physics Letters 2021年第2期38卷 118-118页

作者： Jian Xing Li-Tian Wang Xiao-Xin Gao Xue-Lian Liang Kai-Yong He Ting Xue Sheng-Hui Zhao Jin-Li Zhang Ming He Xin-Jie Zhao Shao-Lin Yan Pei Wang Lu Ji College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350China Beijing Institute of Radio Measurement Beijing 100854China

In Fig.2 of the article,[1]the figure caption should be“Rocking curve of the(006)peak of the Tl-1223 thin film”instead of“Rocking curve of the(003)peak of the Tl-1223 thin film”.The corresponding description of this figure should be“As shown in Fig.2,the full width at half maximum(FWHM)of the Tl-1223(006)reflection peak is only 0.58∘,which shows that the film possesses a good crystalline structure”,instead of“As shown in Fig.2,the FWHM of the Tl-1223(003)reflection peak is only 0.58∘,which shows that the film possesses a good crystalline structure”.

关键词： film Cu3O crystalline

来源：评论

学校读者我要写书评

暂无评论

Learned end-to-end high-resolution lensless fiber imaging toward intraoperative real-time cancer diagnosis

arXiv

引用

arXiv 2022年

作者： Wu, Jiachen Wang, Tijue Uckermann, Ortrud Galli, Roberta Schackert, Gabriele Cao, Liangcai Czarske, Jürgen Kuschmierz, Robert Laboratory of Measurement and Sensor System Technique TU Dresden Helmholtzstrasse 18 Dresden01069 Germany State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing100084 China Department of Neurosurgery University Hospital Carl Gustav Carus TU Dresden Dresden Germany Division of Medical Biology Department of Psychiatry Faculty of Medicine University Hospital Carl Gustav Carus TU Dresden Germany Department of Medical Physics and Biomedical Engineering Faculty of Medicine Carl Gustav Carus TU Dresden Germany Competence Center BIOLAS TU Dresden Dresden Germany Excellence Cluster Physics of Life TU Dresden Dresden Germany Faculty of Physics School of Science TU Dresden Dresden Germany

Endomicroscopy is indispensable for minimally invasive diagnostics in clinical practice. For optical keyhole monitoring of surgical interventions, high-resolution fiber endoscopic imaging is considered to be very promising, especially in combination with label-free imaging techniques to realize in vivo diagnosis. However, the inherent honeycomb-artifacts of coherent fiber bundles (CFB) reduce the resolution and limit the clinical applications. We propose an end-to-end lensless fiber imaging scheme toward intraoperative real-time cancer diagnosis. The framework includes resolution enhancement and classification networks that use single-shot fiber bundle images to provide both high-resolution images and tumor diagnosis result. The well-trained resolution enhancement network not only recovers high-resolution features beyond the physical limitations of CFB, but also helps improving tumor recognition rate. Especially for glioblastoma, the resolution enhancement network helps increasing the classification accuracy from 90.8% to 95.6%. The novel technique can enable histological real-time imaging through lensless fiber endoscopy and is promising for rapid and minimal-invasive intraoperative diagnosis in clinics. Copyright © 2022, The Authors. All rights reserved.

关键词： Fibers

来源：评论

学校读者我要写书评

暂无评论

Optical tip vibration measurement in CNC milling machines 19

Optical tip vibration measurement in CNC milling machines

引用

19th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2019

作者： Zhang, Hao Kuschmierz, Robert Löser, Michael Ihlenfeldt, Steffen Shi, Shengyu Czarske, Jürgen Laboratory of Measurement and Sensor System Techniques Technische Universität Dresden Dresden01062 Germany Institute of Mechatronic Engineering TU Dresden Dresden Germany Key Laboratory of Polymer Processing Engineering of Ministry of Education National Engineering Research Center of Novel Equipment for Polymer Processing School of Mechanical and Automobile Engineering South China University of Technology Guangzhou510640 China

ISBN: (纸本)9780995775145

Vibrations of milling tools, especially of slender end mills, are one of the main contributors to shape deviations of machined work pieces in the milling process. For milling machines, the vibration behaviour depends on the spindle speed and end mill properties. Numerical models can help to predict vibrational behaviour and reduce vibrations. This requires measuring the frequency response of the end mill. We propose a system for investigating the frequency response function inside of a milling machine under different rotational speeds. It consists of an automated impact unit generating vibrations with a known force and a novel Mach-Zehnder interferometer based sensor. The sensor enables simultaneous axial distance and lateral velocity measurement at fast rotating surfaces with submicron uncertainty and measurement rates up to 50 kHz. The bidirectional vibration frequencies are estimated by the signal-processing algorithm depending on the geometric relationship of the displacement in two directions. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Frequency response

来源：评论

学校读者我要写书评

暂无评论

Original Structural and Electrical Investigation for a New $\mathbf{BG-F}_{6}$ Vitreous Bio-Ceramic as Humidity sensors

Original Structural and Electrical Investigation for a New $...

引用

IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： A. Gharbi A.Y. Kallel A. Bouhamed A. Al-Hamry O. Kanoun N. Derbel University of Paris 1 LSPM CNRS-UPR 9001 PRES Sorbonne Paris Cité Villetaneuse France Technische Universittä t Chemnitz Chair for Measurement and Sensor Technology Chemnitz Germany University of Sfax Control & Energy Management Laboratory National Engineering School of Sfax Tunisia

ISBN: (数字)9781728110806

ISBN: (纸本)9781728110813

Two biomaterial types have been the focus of sensor applications: Fluorosilicate bioactive Glass BG-F 6 crude and compact. Of the two, BG-F 6 compact material show the greater mechanical strength, and electrical behaviour provoke greater humidity sensing capacity. Thus, the glassy discs show great potential for deployment in a new generation of biosensors and environment requires. The aim of this paper is to develop a material that combines an interesting mechanical strength, monophasic stability with potential thermic resistance and great electrical capacity. By returning to its high temperature synthesis protocol, makes this fluorosilicate glass an attractive material for sensors development topic and environmental precautions.

关键词： Water Temperature sensors Electric potential Humidity Glass Ceramics Thermal stability

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：