检索结果-内蒙古大学图书馆

7th IEEE Palestinian International Conference on Electrical and Computer engineering, PICECE 2019

作者： Khozondar, Hala Jarallah El Zainuddin, Siti Zafarh Bte Koch, Alexander W. Electrical Engineering Department Islamic University of Gaza P.O.Box 108 Gaza Palestine Institute for Measurement Systems and Sensor Technology German Institute for Science and Technology GIST-TUM Asia Singapore Singapore Institute for Measurement Systems and Sensor Technology Technische Universitaet Muenchen TUM MuenchenD-80333 Germany

ISBN: (纸本)9781538662915

This work describes a modelling and simulation of the switching mechanism of an off-grid hybrid power system. An offgrid system means that it is not connected to an electricity grid or network. An off-grid power system is important especially at catastrophe times and war where it is hard to get electricity from a utility grid. In addition to that, owners of residential and small-scale commercial structures which are located in remote areas will be able to have access to the electricity. The switching mechanism depends on the renewable energy amount. An off-grid hybrid power system utilizes an array of deep-cycle batteries to store the power generated by the solar panels and a wind turbine. When the renewable sources have excess energy, it is stored in the battery. However, If the renewable sources do not supply enough energy to the loads, the switching mechanism will let the battery provide the load with the required energy. The simulation results in this work show the advantages of using the off-grid system to produce electricity or power from one or more source of renewable energy. © 2019 IEEE.

关键词： Electric power transmission networks

来源：评论

学校读者我要写书评

暂无评论

Kinematic simulation to investigate the influence of the cutting edge topography when ball end micro milling

引用

Procedia CIRP 2021年 102卷 109-114页

作者： Katja Klauer Nicolas Altherr Matthias Eifler Benjamin Kirsch Volker Böß Jörg Seewig Jan C. Aurich Institute for Manufacturing Technology and Production Systems Technische Universität Kaiserslautern Gottlieb-Daimer Str. 67663 Kaiserslautern Germany Institute for Measurement and Sensor-Technology Technische Universität Kaiserslautern Gottlieb-Daimer Str. 67663 Kaiserslautern Germany IU University of Applied Sciences Juri-Gagrin-Ring 152 99084 Erfurt Germany Institute of Production Engineering and Machine Tools Leibniz Universität Hannover An der Universität 2 30823 Gabsen Germany

During the ball end micro milling of material measures, the cutting edge topography is imaged on the machined workpiece. The influence of the chipping on the resulting surface quality is much more dominant than other kinematic effects. In this simulative study, a model is built that is able to predict the correlation between the cutting edge topography and the resulting workpiece topography. Thus, the mentioned correlation can be investigated without overlaying effects of material separation or measurement uncertainties, which are unavoidable in an experimental study. The model has been validated based on four artificial chippings.

关键词： micro milling cutting edge topography kinematic simulation dexel model

来源：评论

学校读者我要写书评

暂无评论

Simulation and measurement of millimeter-wave radiation from Josephson junction array

引用

Chinese Physics B 2019年第6期28卷 87-90页

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

We report the circuit simulations and experiments of millimeter-wave radiation from a high temperature superconducting(HTS) bicrystal Josephson junction(BJJ) array. To study the effects of junction characteristic parameters on radiation properties, new radiation circuit models are proposed in this paper. The series resistively and capacitively shunted junction(RCSJ) models are packaged into a Josephson junction array(JJA) model in the simulation. The current-voltage characteristics(IVCs) curve and radiation peaks are simulated and analyzed by circuit models, which are also observed from the experiment at liquid nitrogen temperature. The experimental radiation linewidth and power are in good agreement with simulated results. The presented circuit models clearly demonstrate that the inconsistency of the JJA will cause a broad linewidth and a low detected power. The junction radiation properties are also investigated at the optimal situation by circuit simulation. The results further confirm that the consistent JJA characteristic parameters can successfully narrow the radiation linewidth and increase the power of junction radiation.

关键词： high temperature superconducting(HTS) Josephson junction array radiation circuit model simulation

来源：评论

学校读者我要写书评

暂无评论

Design optimization of spiral coils for textile applications by genetic algorithm

Design optimization of spiral coils for textile applications...

引用

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

作者： Yosra Ben Fadhel Ghada Bouattour Dhouha Bouchaala Nabil Derbel Olfa Kanoun Lab. of Biophysics and Medical Technology High Institute of Medical Technologies University of Tunis El-Manar Tunis Tunisia Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany Digital Center of Sfax University of Sfax Sfax Tunisia University of Sfax National School of Engineering of Sfax Sfax Tunisia

Resonant inductive coupling (RIC) systems have undergone a remarkable improvement thanks to several research efforts. Nevertheless, practical difficulties and stringent design requirements still present several limitations and challenges to overcome. One of the important concerns is how to design the coils for the desired power level with a high efficiency considering all design constraints and parameters, i.e. the number of turns, the frequency, the air gap, etc. A planar spiral coil can be considered as an inductance connected in series with internal resistance. The coil resistance significantly decreases the power transfer efficiency (PTE) in resonant inductive coupling wireless power transfer (RIC WPT) applications, since it leads to power losses. In this paper, we have suggested a numerical optimization method based on genetic algorithms (GA) that gives the best coil parameters ensuring the highest coil quality factor, by respecting the system design constraints such as the frequency and the used material. In this paper, we propose a model for a silver planar spiral coil and an operating frequency of 100 kHz, following the Qi guidelines. Obtained results show the efficiency of genetic algorithms for giving the optimal solution for designing spiral coils, without the need to simplify the model function.

关键词： Coils Resistance Q-factor Geometry Silver Spirals Systematics

来源：评论

学校读者我要写书评

暂无评论

On the development and qualification of multiaxial designs of nanofabrication machines with ultra precision tool rotations 19

On the development and qualification of multiaxial designs o...

引用

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

作者： Schienbein, Ralf Fern, Florian Theska, René Füßl, Roland Institute of Design and Precision Engineering Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Germany Institute of Process Measurement and Sensor Technology Department of Mechanical Engineering Technische Universität Ilmenau Germany

ISBN: (纸本)9780995775145

The majority of nanopositioning and nanomeasuring machines (NPMMs) are based on three independent linear movements in a Cartesian coordinate system with a repeatability in the nanometer range. This in combination with the specific nature of sensors and tools limits the addressable part geometries. This article contributes to the enhancement of multiaxial machine structures by the implementation of rotational movements while keeping the precision untouched. A parameter based dynamic evaluation system with quantifiable technological parameters has been set up and employed to identify general solution concepts and adequate substructures. It further on contains data based on comprehensive design catalogues, uncertainty calculations and CAD-model based footprint analysis for specific setups. First evaluations show high potential for sample scanning mode variants considering linear movements of the object in combination with angular movements of the tool, considering a goniometer setup in specific. Based on this, positioning systems for the tool rotation of a NPMM were selected and the positioning properties of different arrangements were determined in test series using autocollimators. General properties of the influence of the arrangement were derived. The arrangement of the substructures which fulfils the previous given requirements is integrated into the NPMM and investigated for long-term stability using a retroreflector as a tool and various laser interferometers. The influence of the additional positioning systems on the existing structure of NPMMs are investigated and solutions for the optimization of the overall system with regard to reproducibility and long-term stability are developed. For this purpose, comprehensive FEA simulations are carried out and structural adjustments are derived via topology optimizations. After all, the knowledge gained is formed into general rules for the verification and optimization of design solutions for multiaxial nanopositioning

关键词： Nanotechnology

来源：评论

学校读者我要写书评

暂无评论

Tip-and Laser-based 3D Nanofabrication in Extended Macroscopic Working Areas

引用

Nanomanufacturing and Metrology 2021年第3期4卷 132-148页

作者： Ingo Ortlepp Thomas Frohlich Roland FuBl Johann Reger Christoph Schaffel Stefan Sinzinger Steffen Strehle ReneTheska Lena Zentner Jens-Peter Zollner Ivo WRangelow Carsten Reinhardt Tino Hausotte Xinrui Cao Oliver Dannberg Florian Fern David Fischer Stephan Gorges Martin Hofmann Johannes Kirchner Andreas Meister Taras Sasiuk Ralf Schienbein Shraddha Supreeti Laura Mohr-Weidenfeller Christoph Weise Christoph Reuter Jaqueline Stauffenberg Eberhard Manske Institute of Process Measurement and Sensor Technology Technische Universitat IlmenauEhrenbergstrasse 2998693 IlmenauGermany Control Engineering Group Technische Universitat IlmenauIlmenauGermany Optical Engineering Group.Technische Universitat Ilmenau IlmenauGermany Microsystems Technology Group.Technische Universitat Ilmenau IlmenauGermany Precision Engineering Group.Technische Universitat Ilmenau IlmenauGermany Compliant Systems Group Technische Universitat IlmenauIlmenauGermany Micro-and Nanoelectronic Systems Group Technische Universitat IlmenauIlmenauGermany Nanoscale Systems Group.Technische Universitat Ilmenau IlmenauGermany Division for Research Service and Technology Transfer Technische Universitat IlmenauIlmenauGermany Electronics Technology Group.Technische Universitat Ilmenau IlmenauGermany IMMS Institut flir Mikroelektronik-und Mechatronik-Systeme Gemeinniitzige GmbH(IMMS GmbH) IlmenauGermany Fachgebiet Technische Physik City University of Applied SciencesBremenGermany Lehrstuhl fiir Fertigungsmesstechnik Friedrich-Alexander-U niversitat(FAU)Erlangen-NiirnbergGermany JUMO GmbH&Co.KG FuldaGermany Asphericon GmbH JenaGermany

The field of optical lithography is subject to intense research and has gained enormous ***,the effort necessary for creating structures at the size of 20 nm and below is considerable using conventional *** effort and the resulting financial requirements can only be tackled by few global companies and thus a paradigm change for the semiconductor industry is conceivable:custom design and solutions for specific applications will dominate future development(Fritze in:Panning EM,Liddle JA(eds)Novel patterning *** society for optics and ***,Bellingham,***://***/10.1117/12.2593229).For this reason,new aspects arise for future lithography,which is why enormous effort has been directed to the development of alternative fabrication ***,the technologies emerging from this process,which are promising for coping with the current resolution and accuracy challenges,are only demonstrated as a proof-of-concept on a lab scale of several square *** scale is not adequate for the requirements of modern lithography;therefore,there is the need for new and alternative cross-scale solutions to further advance the possibilities of unconventional *** challenges arise because of the technical progress in various other fields,realizing new and unique functionalities based on nanoscale effects,e.g.,in nanophotonics,quantum computing,energy harvesting,and life *** platforms for basic research in the field of scale-spanning nanomeasuring and nanofabrication are necessary for these tasks,which are available at the Technische Universitiit Ilmenau in the form of nanopositioning and nanomeasuring(NPM)*** this equipment,the limits of technical structurability are explored for high-performance tip-based and laser-based processes for enabling real 3D nanofabrication with the highest precision in an adequate working range of several thousand cubic millimete

关键词： Nanomeasuring Nanopositioning Nanomanufacturing Scale-spanning Tip-based Laser-based Nanofabrication

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

Mechanical properties of an adjustable weighing cell prototype 19

Mechanical properties of an adjustable weighing cell prototy...

引用

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

作者： Darnieder, Maximilian Pabst, Markus Fröhlich, Thomas Zentner, Lena Theska, René Department of Mechanical Engineering Technische Universität Ilmenau Institute for Design and Precision Engineering Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Institute for Process Measurement and Sensor Technology Process Measurement Technology Group Germany Department of Mechanical Engineering Technische Universität Ilmenau Compliant Systems Group Germany

ISBN: (纸本)9780995775145

Weighing cells based on the principle of electromagnetic force compensation are highly sensitive force measuring devices. A compliant mechanism with thin flexure hinges constitutes the mechanical basis of the balance. The weighing cells are the core components of high-performance vacuum mass comparators, e.g. for the comparison of one kilogram mass standards. According to the mechanical models, the achievable sensitivity of the measurement device is only limited by the adjustment resolution. Without further measures, the vertical adjustment of small trim masses represents a trade-off between resolution and tilt sensitivity. The numerical test of the underlying adjustment concept by finite element models reveals that the objectives of a high sensitivity and a low tilt sensitivity can be achieved simultaneously by a meaningful combination of adjustment measures. This represents a promising concept for the further enhancement of vacuum mass comparators. The prototypes are planar weighing cell structures for a flexible choice of the manufacturing process. The planar mechanism facilitates the comparison between models and measurements. The weighing cells for a nominal mass of 300g are experimentally investigated. The measurement of tilt reactions is enabled by the use of a precision tilt table as base for the weighing cell. Properties like stiffness and tilt sensitivity are determined as a function of the adjustment parameters. This way the mechanical models are verified, and the property enhancement of the weighing cell is evaluated. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Cells

来源：评论

学校读者我要写书评

暂无评论

Correction: Fundamental Investigations in the Design of Five-Axis Nanopositioning Machines for measurement and Fabrication Purposes

引用

Nanomanufacturing and Metrology 2022年第4期5卷 437-437页

作者： Schienbein, Ralf Fern, Florian Theska, René Supreeti, Shraddha Füßl, Roland Manske, Eberhard Department of Mechanical Engineering Institute of Design and Precision Engineering Technical University of Ilmenau Ilmenau Germany Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Technical University of Ilmenau Ilmenau Germany Electronics Technology Group Department of Electrical Engineering and Information Technology Technical University of Ilmenau Ilmenau Germany

来源：评论

学校读者我要写书评

暂无评论

Influence of different cooling strategies during hard turning of AISI 52100 – part II: characterization of the surface and near surface microstructure morphology

引用

Procedia CIRP 2020年 87卷 119-124页

作者： Werner Ankener Julian Uebel Stephan Basten Marek Smaga Benjamin Kirsch Jörg Seewig Jan C. Aurich Tilmann Beck Institute of Materials Science and Engineering TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany Institute for Measurement and Sensor Technology TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany Institute for Manufacturing Technology and Production Systems TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany

This two-part paper addresses the impact of seven different cooling conditions on the finishing process as well as the resulting surface and near-surface microstructure morphology of the rolling bearing steel AISI 52100 in martensitic heat treatment state. The applied cooling strategies are liquid nitrogen (LN 2 -) cooling, CO 2 -snow cooling at varied mass flows, sub-zero metalworking fluids (MWF) at varied supply temperatures, and dry machining. Part II of the paper concerns the changes in surface roughness, examined by an angle resolved scatter light sensor, micro hardness measurement, microstructure observations, residual stress and phase composition analyses in the near-surface area, caused by the turning process, that is characterized in Part I. The lowest cooling performance, i.e. dry machining, results in low compressive axial residual stresses and a high proportion of retained austenite at the near-surface area. High cooling performance strategies like CO 2 cooling or sub-zero MWF show an opposite distribution of the mentioned parameters, wherein the coolants’ lubrication effect is an important aspect. Microstructural differences resulting from the process parameters used in these investigations tend to be less significant. Thus, they do not allow reliable assignment of the microstructure to the cooling strategies used. However, different cooling conditions show an impact on residual stresses, phase distribution and surface topography of the workpieces to varying extents.

关键词： cryogenic turning surface integrity micro structure

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：