检索结果-内蒙古大学图书馆

Special section: Energy - Solid oxide fuel cells and membranes

Chemical engineering Progress 2016年第7期112卷

作者： Brinkman, Kyle Huang, Kevin Dept. of Materials Science and Engineering Clemson Univ since 2014 161 Sirrine Hall ClemsonSC29634 United States Mechanical Engineering Department SmartState Center for Solid Oxide Fuel Cells University of South Carolina United States

Fuel cells and membranes are similar in that they employ materials that transport ions and electrons. Both can play important roles in making clean energy a reality. A solid oxide fuel cell (SOFC) directly converts the chemical energy in fossil fuels into electrical power via an electrochemical reaction. A SOFC has three basic functional elements, cathode, electrolyte, and anode. Like the components of a battery, each SOFC component exhibits an internal resistance to either electronic or ionic current flow, often expressed as voltage loss. The terminal cell voltage is, therefore, the open circuit voltage reduced by the individual voltage loss of each cell component. To increase the reliability and reduce the cost of SOFCs, designers strive to obtain high performance at low operating temperatures. To achieve this goal, modern SOFCs typically contain a thin electrolyte film supported on a substrate a porous or channeled dense layer that enables gas transport. The porous electrode (cathode or anode), dense metal or ceramic interconnect, or porous inactive insulator can serve as the substrate.

关键词： Solid oxide fuel cells (SOFC)

来源：评论

学校读者我要写书评

暂无评论

Removal of Mn ions from polluted water using dealuminated kaolinite

引用

Journal of engineering and Applied science 2016年第3期63卷 221-236页

作者： Anwar, A. El-Mid Any, A.A. Hassan, M. El-Shall, H. Elwageeh, M. Cairo Water Company Egypt Mining Engineering Program Mining Petroleum and Metallurgy Dept. Faculty of Engineering Cairo University Egypt Ore Evaluation Lab. Minerals Technology Department Central Metallurgical R and D Institute Egypt Emeritus of Materials Science and Engineering University of Florida United States Faculty of Engineering Cairo University Egypt

Manganese is one of the pollutants that affect the human health when exceeds the permissible limit. Due to the toxic and hazardous nature of Mn, it is possibly the most widespread groundwater contaminant, imposing a serious threat to human health. There are several efforts to remove manganese from water by adsorption process. The goal of this study is to find a cost effective adsorbent. In this regard, dealuminated kaolinite may be used as adsorbent due to its activation by thermal and chemical treatment during Al removal process. In addition absence of Al atoms may provide excess active energy for adsorption of cations such as Mn. The results indicated that the longer adsorption time gives more chance for Mn ions to adsorb on kaolinite leading to highest efficiency of Mn removal (about 64.5%) at low pH and extraction time of 5 hours. At higher pH =9, Mn removal efficiency increased but at lower level than that at the acidic pH range. Finally a suitable effect results based on the bases of ionic species of Mn as a function of pH indicating the possibility of precipitation of Mn as manganese carbonates. © 2016 Cairo University. All rights reserved.

关键词： Kaolinite

来源：评论

学校读者我要写书评

暂无评论

Development of one hand drive wheelchair system: Design and Experiment of the active front wheel system

Development of one hand drive wheelchair system: Design and ...

引用

IEEE Symposium on Computational Intelligence and Bioinformatics and Computational Biology (CIBCB)

作者： Daisuke Hayashi Sho Yokota Daisuke Chugo Hiroshi Hashimoto Dept. of Mechanical Engineering Toyo University Kawagoe Saitama Japan School of Science and Technology Kwansei Gakuuin University Sanda Hyogo Japan Master Program of Innovation for Design and Engineering Advanced Institute of Industrial Tech. Tokyo Japan

ISBN: (纸本)9781509000128

The purpose of this study is to propose the wheelchair system enabling hemiplegic users to steer the wheelchair by one hand drive. This system consists of two parts: extraction of user's control intention from the single hand rim and the front wheel system with active steering. In particular, this paper focuses on the feasibility verification of this system and to propose the front wheel system. For this verification, the rigid body dynamics simulation was conducted. The result showed that the orientation of the wheelchair could be changed by driving the single driving wheel and by steering the front wheel. The required steering torque for front wheel was derived to design the front wheel system. After that, the prototype was proposed. Then the basic experiment was conducted to verify the efficiency of the system. The result of the experiment showed that the orientation of the wheelchair could be changed by steering front wheel and by one hand drive.

关键词： Wheels Wheelchairs Torque Friction Force Grounding Actuators

来源：评论

学校读者我要写书评

暂无评论

High Performance Complementary Ge Peaking FinFETs by Room Temperature Neutral Beam Oxidation for Sub-7 nm Technology Node Applications

High Performance Complementary Ge Peaking FinFETs by Room Te...

引用

IEEE International Electron Devices Meeting

作者： Y.-J. Lee T.-C. Hong F.-K. Hsueh P.-J. Sung C.-Y. Chen S.-S. Chuang T.-C. Cho S. Noda Y.-C. Tsou K.-H. Kao C.-T. Wu T.-Y. Yu Y.-L. Jian C.-J. Su Y.-M. Huang W.-H. Huang B.-Y. Chen M.-C. Chen K.-P. Huang J.-Y. Li M.-J. Chen Y. Li S. Samukawa W.-F. Wu G.-W. Huang National Nano Device Laboratories Hsinchu Taiwan Dept. of Electrophysics National Chiao Tung University Hsinchu Taiwan Dept. of Electrical and Computer Engineering National Chiao Tung University Hsinchu Taiwan Dept. of Electronics Engineering & Institute of Electronics National Chiao Tung University Hsinchu Taiwan Institute of Fluid Science Tohoku University Sendai Japan Dept. of Electrical Engineering National Cheng Kung University Tainan Taiwan Mechanical and Systems Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan Dept. of Electrical Engineering and Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Dept. of Materials Science and Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9781509039036

Ge peaking n- and p-FinFETs have been demonstrated by adopting neutral beam etching (NBE) and anisotropic neutral beam oxidation (NBO) processes. The irradiation-free NB processes not only suppress surface roughness but also guarantee low defect generation on the etched Ge surface. The fabricated Ge peaking FinFETs possess several unique features: (1) A peaking fin configuration with a 6-nm top-gate formed by an anisotropic NBO process at room temperature. (2) Nearly defect-free three dimensional channel surfaces by NB processes. (3) Ion and G_m improvement by NB processes as compared to that by conventional inductively coupled plasma etching (ICP). (4) Recorded high Ion/Ioff ratio and low subthreshold swing (S.S. ~ 70 mV/dec.) of Ge n-FinFETs. (5) Excellent immunity for short channel effect of Ge FinFETs.

关键词： FinFETs Sub-7 nm Technology Node Applications NB

来源：评论

学校读者我要写书评

暂无评论

Application of a new one-equation turbulence model based on k-ω closure to flow in S-ducts 53

Application of a new one-equation turbulence model based on ...

引用

53rd AIAA Aerospace sciences Meeting, 2015

作者： Han, Xu Wray, Timothy J. Fiola, Colin Agarwal, Ramesh K. Dept. of Mechanical Engineering and Materials Science Washington University in St. Louis MO63130 United States

ISBN: (数字)9781624103438

ISBN: (纸本)9781624103438

Hie focus of this paper is on validation and application of a new one equation eddy viscosity model derived from k-eo closure for three-dimensional flows in serpentine difrusers (S-ducts). The S-duct’s geometry produces streamline curvature and an adverse pressure gradient resulting in flow separation. Two S-duct geometries are employed in this investigation - one was used in an experimental study conducted at NASA Glenn Research Center in the early 1990‘s and the other is a benchmark configuration proposed by AIAA Propulsion Aerodynamics Workshop (PAW7). The CFD flow solver ANSYS Fluent is used for flow calculations. Results from the new model, the commonly used Spalart-Alhnaras (SA) and the Shear-Stress-Transport (SST) k-ω models are compared to the available experimental data. © 2015 by H. Xu, T. Wray. C. Fiola and R. K. Agarwal.

关键词： Flow separation

来源：评论

学校读者我要写书评

暂无评论

Buoyancy effect on atmospheric surface layer: measurements from the East Coast of Malaysia

引用

Journal of Physics: Conference Series 2017年第1期822卷

作者： Z. Harun E. Reda Rozli Zulkifli Dept. Mechanical and Materials Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi 43600 Malaysia Marine Ecosystem Research Centre (EKOMAR) Faculty of Science and Technology Universiti Kebangsaan Malaysia UKM Bangi 43600 Malaysia

The nature and evolution of the atmospheric surface layer is still unresolved completely. Many questions regarding the existence of the z-less layer and trend of the cross correlations still remain open. This research analyzes some of the surface layer ambiguities. In this research temperature, velocity and turbulence data were collected from a weather station facility located in the Marine Ecosystem Research Centre (EKOMAR) Mersing on the East Coast of Malaysia. Two high resolution hotwires were utilized at 3 m and 12 m heights above ground. Both gradient Richardson number and Obukhov stability parameter were calculated. Turbulence spectra were plotted at different stability conditions. The results does not show the existence of the z-less layer at deep stable condition. The buoyancy force, under unstable condition, was found responsible for the increase of vertical correlation factor. The fingerprint of the buoyancy force was detected in the spectra at low frequencies.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Concept for a Fully in Situ Resource-Derived Habitat for Martian Environment 15

Concept for a Fully in Situ Resource-Derived Habitat for Mar...

引用

15th Biennial International Conference on engineering, science, Construction, and Operations in Challenging Environments, Earth and Space 2016

作者： Meza, Lucas Singer, Russell Vazquez, Noel Keenan, Ryan Burgoyne, Hayden Hogstrom, Kristina Tan, Wei-Lin Dept. of Mechanical and Civil Engineering California Institute of Technology 1200 E California Blvd. PasadenaCA91125 United States Transportation Systems Design Art Center College of Design 1700 Lida St. PasadenaCA91103 United States Dept. of Architecture California State Polytechnic Univ. Pomona 3801 W. Temple Ave. PomonaCA91768 United States Dept. of Aerospace California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States Dept. of Applied Physics and Materials Science California Institute of Technology 1200 E. California Blvd. PasadenaCA91125 United States

ISBN: (纸本)9780784479971

To date, concepts for establishing long-term habitats for a human crew on Mars have revolved around the periodic delivery of wholesale systems built fully on Earth, which then dock together in a similar fashion to the International Space Station. While initial missions will require such rigorously-tested systems, this 'plug-and-play' method of pre-built systems from Earth becomes unfeasibly costly over time due to the high launch mass. In situ resource utilization (ISRU) provides a cost-effective, sustainable means of expansion and maintenance of a human habitat on Mars. In this paper, we propose a design for a Martian human habitat for a crew of four constructed exclusively with in situ resources, using existing technologies in robotics, materials processing, and additive construction. We further draw attention to livability and architectural considerations in the design which operate in tandem with engineering ones, as they are critical to long-term human habitation. © 2016 American Society of Civil Engineers.

关键词： Earth (planet)

来源：评论

学校读者我要写书评

暂无评论

Application of the Wray-Agarwal model to compressible flows 45

Application of the Wray-Agarwal model to compressible flows

引用

45th AIAA Fluid Dynamics Conference, 2015

作者： Wray, Timothy J. Agarwal, Ramesh K. Dept. of Mechanical Engineering and Materials Science Washington University in St. Louis St LouisMO63130 United States

ISBN: (数字)9781624103629

ISBN: (纸本)9781624103629

This paper employs the recently developed one-equation Wray-Agarwal (WA) eddy viscosity turbulence model to simulate several highly compressible flows. The new model is compared to the one-equation Spalart-Allmaras and two-equation Shear-Stress-Transport k-ω models. Computational results for a 2D slot nozzle-ejector, transonic RAE 2822 airfoil, and transonic flow over an axisymmetric bump with mild separation are presented. It is shown that the Wray-Agarwal model is in better agreement with experimental data than the Spalart-Allmaras model and is competitive with the SST k-ω model. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Compressible flow

来源：评论

学校读者我要写书评

暂无评论

The engineering of soft ferromagnetic plane by AISI 304 hardening process

引用

AIP Conference Proceedings 2017年第1期1788卷

作者： Naila Mubarok Hamdan Akbar Notonegoro Kemas Ahmad Zaini Thosin Azwar Manaf 1PPS Materials Science FMIPA-Universitas Indonesia Depok 16424 Indonesia 2Mechanical Engineering Dept. FT-Universitas Sultan Ageng TirtayasaCilegon 42435 Indonesia 3Pusat Penelitian Fisika LIPI Serpong Indonesia

Austenitic stainless steels AISI 304 are widely used in engineering applications for various industrial applications. In basic condition, AISI 304 is non-magnetic. Shifting the structure through the hardening process will affect the magnetic properties. This technique makes it possible to produce soft ferromagnetic material through mechanical processes. A percentage of thinning rate correlated linearly with the thickness of the sample. Sizeable changing occurred at 21-30 HVC. The hysteresis curve shows the soft ferromagnetic property with small coercivity. The magnetic value significantly increased found at 344 HVC to 371 HVC and maximum when reaching 425 HVC. We suggest a 60% of thinning as a better hardening process for manufacturing soft ferromagnetic material from AISI 304.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Middle and inner ear modelling: From microCT images to 3D reconstruction and coupling of models

Middle and inner ear modelling: From microCT images to 3D re...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： N. S. Tachos A. I. Sakellarios G. Rigas V. Isailovic G. Ni F. Böhnke N. Filipovic T. Bibas D.I. Fotiadis Dept. of Materials Science and Engineering University of Ioannina GR Faculty of Mechanical Engineering University of Kragujevac Serbia ISVR University of Southampton UK Department of Otorhinolaryngology of the University of Munich University of Athens and University College of London Ear Institute Biomedical Research Institute - FORTH University Campus of Ioannina Ioannina Greece

We present finite element (FE) modeling approaches of ear mechanics including 3-dimensional (3D) reconstruction of the human middle and inner ear. Specifically, we demonstrate a semi-automatic methodology for the 3D reconstruction of the inner ear structures, a FE harmonic response model of the middle ear to predict the stapes footplate frequency response, a 2D FE slice model of the cochlea for the coupled response at the micromechanical level for either acoustic or electrical excitation and a coupled FE middle ear model with a simplified cochlea box model to simulate the basilar membrane velocity in response to acoustic excitation. The proposed methodologies are validated against experimental and literature data and the results are in good agreement.

关键词： Ear Finite element analysis Solid modeling Three-dimensional displays Geometry Acoustics Fluids

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：