检索结果-内蒙古大学图书馆

SiO2-reinforced Poly (methyl methacrylate): Tribology Performance as Service Life Sensor

Sensors and Materials 2023年第8-2期35卷 2845-2854页

作者： Shi, Shih-Chen Zeng, Xin-Xing Chen, Tao-Hsing Wang, Chih-Chia Lin, Yue-Feng Department of Mechanical Engineering National Cheng Kung University No. 1 University Road Tainan City70101 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology No. 415 Jiangong Rd. Sanmin Dist. Kaohsiung City807618 Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University No. 75 Shiyuan Road Taoyuan335009 Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University No. 1001 University Road Hsinchu300093 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology No. 57 Sec. 2 Zhongshan Rd. Taiping Dist. Taichung411030 Taiwan

Poly (methyl methacrylate) (PMMA), which is suitable for use in the human body owing to its biocompatibility, is commonly used in medical applications such as bone nails, bone cement, and dentures. However, owing to its hard and brittle nature, PMMA can cause damage when it is subjected to excessive stress and can also cause severe wear. In this study, three different sizes of silica particles were used as reinforcing additives to enhance the wear resistance of PMMA composites. A pin-on-disk wear test was conducted to record the coefficient of friction and wear volume, and the wear volume was measured using a 3D laser scanning microscope. In the wear test, the transfer film of micron and submicron particles produced a plowing effect, resulting in wide grooved wear scars and a higher wear rate than the raw material. The nanoparticle transfer film reduced direct material wear, the wear scars were fine and flat, and the wear rate was decreased, reducing the wear of SiO2-reinforced PMMA composites by 40%. The experimental results revealed that the wear volume is proportional to the wear time. In addition, the observed area of the transfer film on the wear counterpart can be used as a service life sensor of the coating material. © MYU K.K.

关键词： Tribology

来源：评论

学校读者我要写书评

暂无评论

Double Layers Omega FETs with Ferroelectric HfZrO2 for One-Transistor Memory

Double Layers Omega FETs with Ferroelectric HfZrO2 for One-T...

引用

Annual International Symposium on Reliability Physics

作者： K.-T. Chen C. Lo Y.-Y. Lin C.-Y. Chueh C. Chang G.-Y. Siang Y.-J. Tseng Y.-J. Yang F.-C. Hsieh S.-H. Chang H. Liang S.-H. Chiang J.-H. Liu Y.-D. Lin P.-C. Yeh C.-Y. Wang H.-Y. Yang P.-J. Tzeng M.-H. Liao S. T. Chang Y.-Y. Tseng M. H. Lee Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Electronic and Optoelectronic System Research Laboratories Industrial Technology Research Institute Hsinchu Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering National Chung Hsing University Taichung Taiwan TCAD Silicon Engineering Group Synopsys Taiwan Co. Ltd. Hsinchu Taiwan

ISBN: (数字)9781728131993

ISBN: (纸本)9781728132006

The 3D double layer Ω-type FETs with ferroelectric HfZrO 2 gate served for one-transistor (1T) architecture is demonstrated and studied for memory reliability. The high endurance is presented more than 10 6 cycles P/E with 4V. Multi-domain model integrated with TCAD is proposed by adding a coupling coefficient for the polarization gradient term of the free energy, and calculating for nanosheet GAA-FETs. The polarization orientation is assigned randomly by Gaussian distribution into individual domain for multi-dimensional 3D device simulation. The data retention is degraded due to depolarization field occurrence at the corner by modeling results. The feasible structure paves the candidate for emerging memory applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Mapping Radionuclide Concentrations in the Uae Using a Gaussian Process Machine Learning Approach

SSRN

引用

SSRN 2024年

作者： Khuwaileh, Bassam A. Almomani, Belal El-Sayed, Samar Ajaj, Rahaf Akram, Yumna Nuclear Engineering Program Department of Mechanical and Nuclear Engineering University of Sharjah Sharjah27272 United Arab Emirates Nuclear Energy System Simulation and Safety Research Group Sustainable Energy & Power Systems Research Centre RISE University of Sharjah 27272 United Arab Emirates College of Health Science Abu Dhabi University Abu Dhabi United Arab Emirates

This study introduces a machine learning approach for mapping soil radionuclide concentrations in the UAE using Gaussian Process (GP) regression. Aimed at enhancing environmental monitoring and public health, the approach utilizes soil samples from across the UAE to create a radiation map (covering Ra-226, Th-232, and K-40 isotopes). GP regression, known for its proficiency in spatial data interpolation, predicts radionuclide levels in areas without direct testing. This method is adept at managing the non-linear spatial complexities inherent in geographic data, offering both a qualitative and quantitative understanding beneficial for decision-making and further sampling strategies. The results reveal the GP model's capacity to accurately reflect geographic variances in isotopic concentrations, with RMSE values of 13%, 14%, and 22% for Ra-226, Th-232, and K-40, respectively. The model's success in learning the geographical variations of the concentrations showcases its potential to guide future research by identifying areas of increased radioactivity risk. © 2024, The Authors. All rights reserved.

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

Supercritical-Co2 Electroless Nickel Plating Enhanced Anti-Corrosion Properties of Micro-Arc Oxidized Az31 Magnesium Alloy

SSRN

引用

SSRN 2022年

作者： Lee, Hung-Bin Sheu, Hung-Hua Jian, Jia-Sian Chang, Sheng-Yueh Yen, Chien-Hsien Lin, Hwai-En Department of Optoelectronics and Materials Technology Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung202 Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Dasi Taoyuan335 Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University Hsin-Chu300 Taiwan Department of Mechanical Engineering Institute of Mechatronic Engineering National Taipei University of Technology Taipei10608 Taiwan

Magnesium alloys which perform low density, high strength-to-weight ratio and excellent mechanical properties have received extensive attention especially in the weight-constrained components in aerospace and automotive industries. Nevertheless, magnesium alloys generally exhibit poor corrosion and wear resistance, which seriously limit their lifespan and developments. Regarding the aforementioned issues, we selected an AZ31 magnesium alloy as the controlled specimen, on which a designed multilayer structure was fabricated to be the surface protective coating. The multilayer coating consisted of an oxide layer prepared by micro-arc oxidation (MAO), a sputtered Ag intermedium layer and a Ni-based anti-corrosion coating deposited by supercritical CO2 assisted electroless deposition (SC-EL-Ni). The Ag/MAO interlayer performed an excellent compatibility between the Ni coating and Mg substrate, leading to a good coating adhesion. Moreover, the as-prepared amorphous SC-EL-Ni layer exhibited a dense and uniform surface, which can effectively prevent the intergranular corrosion and galvanic corrosion. Therefore, the obtained SC-EL-Ni/Ag/MAO sample presented a much better corrosion resistance compared with the Mg alloy and the porous MAO-treated sample. © 2022, The Authors. All rights reserved.

关键词： Magnesium alloys

来源：评论

学校读者我要写书评

暂无评论

Development and integration of an equation-solving program for engineering thermodynamics courses

引用

Computer Applications in engineering Education 1993年第3期1卷 265-265页

作者： Klein, S.A. Mechanical Engineering Department University of Wisconsin-Madison 53706 Dr. S. A. Klein:is a professor of Mechanical Engineering at University of Wisconsin-Madison. His engineering degrees (BS University of Illinois-Chicago MS PhD University of Wisconsin-Madison) were obtained in Chemical Engineering. Professor Klein is a member of the Solar Energy Laboratory at Wisconsin. He is the developer of the F-Chart method for sizing solar heating systems and the TRNSYS simulation program which is widely used in simulations of solar processes. Currently Professor Klein is involved in research on solar energy system performance absorption power cycles finite-time thermodynamics applications adsorption processes for air conditioning and air quality control and alternative refrigerants and systems for refrigeration and air conditioning applications. Professor Klein is also involved in the development of engineering computer tools for both instruction and research. In addition to the EES program described in this paper he is the primary author of the thermodynamics instructional program CP/Thermo and the finite element program FEHT.

Thermodynamics problems can be separated into conceptual and mathematical parts. The conceptual part consists of the problem formulation and analysis. The mathematical part seeks to obtain an answer to a problem by solving the equations identified in the analysis. The mathematical part can be complex and time-consuming and often directs the students' focus away from the concepts. An equation solving program called engineering Equation Solver (EES) was developed to reduce the time and effort required by students to solve the mathematical part of thermodynamics problems. EES differs from existing equation solving programs in that it is designed for use by students and it includes an extensive library of built-in functions for thermodynamic and transport properties of fluids. Thermodynamic and transport property data needed for solving engineering problems (eg, steam tables, refrigerant properties, psychrometric and combustion gas data) are built into the program. By eliminating table lookups and algebra, EES allows students to concentrate on engineering fundamentals, as well as to do more complex design problems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Movement Persuit Control of an Offshore Automated Platform via a RAM-based Neural Network

Movement Persuit Control of an Offshore Automated Platform v...

引用

International Conference on Control, Automation, Robotics and Vision

作者： Horacio L. Franca Joao Carlos P. da Silva Omar Lengerke Max S. Dutra Massimo De Gregorio Felipe M. G. Franca Computer Science Department Mathematics Institute Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Mechanical Engineering Program COPPE Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil Istituto di Cibernetica "Eduardo Caianiello" Consiglio Nazionale delle Ricerche (CNR) Naples Italy System Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil

ISBN: (纸本)9781424478149

The reproduction of the movements of a ship by automated platforms, without the use of sensors providing exact data related to the numeric variables involved, is a non-trivial matter. The creation of an artificial vision system that can follow the cadence of said ship, in six axes of freedom, is the goal of this research. Considering that a real time response is a requisite in this case, it was decided to adopt a Boolean artificial neural network system that could identify and follow arbitrary interest points that could define, as a group, a model of the movement of an observed vessel. This paper describes the development of a prototype based on the Boolean perceptron model WiSARD (Wilkie, Stonham and Aleksander's Recognition Device), that is being implemented in the C programming language on a desktop computer using a regular webcam as input.

关键词： Stewart platform weightless neural networks WiSARD

来源：评论

学校读者我要写书评

暂无评论

RACER - A DESIGN FOR MAINTAINABILITY

引用

NAVAL ENGINEERS JOURNAL 1985年第5期97卷 139-146页

作者： DONOVAN, MR MATTSON, WS Michael R. Donovanis a 1974 graduate of the United States Naval Academy where he received his undergraduate degree in naval architecture. In 1975 he received a master of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. After completing the Navy's nuclear power training program he served as machinery division officer in USSBainbridge (CGN-25) and chemistry and radiological controls assistant in USSLong Beach (CGN-9). He successfully completed the Navy's surface warfare officer qualification and passed the nuclear engineer's examination administered by Naval Reactors. He was then assigned to the Ship Design and Engineering Directorate (SEA-05) Naval Sea Systems Command as head systems engineer on the DDG-51 ship design project where he received the Navy Commendation Medal for outstanding performance. He is currently with Solar Turbines Incorporated as manager ship integration and integrated logistic support for the Rankine cycle energy recovery (RACER) system. Mr. Donovan has lectured at Virginia Polytechnic Institute teaching marine engineering and has given presentations on ship design at various symposiums and section meetings for both ASNE and SNAME. He has been a member of ASNE and SNAME since 1972 and is registered as a professional engineer in California and Virginia. Wayne S. Mattsonreceived his B.S. degree in mechanical engineering from Western New England College in 1972. Following graduation he attended Naval Officer Candidate School and was subsequently assigned as a project officer to COMOPTEVFOR where he was responsible for technical and operational test plans their execution and final equipment appraisal. Following a tour as engineering officer aboard the USSNespelen (AOG-55) he was assigned as commissioning MPA aboard the USSElliot (DD-967) the fifthSpruanceclass destroyer. For the past six years he has been employed by Solar Turbines Incorporated in program management within the advanced development department. He is currently

There is a great deal of emphasis currently in the Navy on the issues of reliability and maintainability. If a system or component is out of commission, it obviously cannot perform its mission. Thus, systems and components must be reliable, with low failure rates, and maintainable, with short repair times when the system does become inoperable. To be effective, these attributes must be incorporated into new ship systems early in the design stage. The Rankine cycle energy recovery (RACER) system is a heat recovery steam cycle designed to recover energy from the exhaust of an LM2500 gas turbine for augmentation of a ship's propulsion system. The RACER system provides several advantages to a gas turbine powered ship, one of which is improved fuel efficiency for significant annual fuel savings. This saving does not come free, however, since, in general, any additional system installed in the ship will have some maintenance requirements. In keeping with the Navy's current emphasis, a key philosophy in the design of the RACER system has been to minimize this maintenance burden. After a brief description of the RACER system and its design philosophy, the techniques being used during the design phase to minimize the maintenance burden on the fleet are presented. Trade-off studies concerning acquisition versus life-cycle costs, including fuel and maintenance costs, are discussed. Innovations incorporated into this state-of-the-art system are reviewed with an emphasis on design for affordability.

关键词： COGENERATION PLANTS

来源：评论

学校读者我要写书评

暂无评论

Studying sprouting angiogenesis under combination of oxygen gradients and co-culture of fibroblasts using microfluidic cell culture model

引用

Materials Today Bio 2023年 21卷 100703页

作者： Hsu, Heng-Hua Ko, Ping-Liang Peng, Chien-Chung Cheng, Ya-Jen Wu, Hsiao-Mei Tung, Yi-Chung Research Center of Applied Sciences Academia Sinica Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Institute of Molecular Biology Academia Sinica Taipei Taiwan Neuroscience Program of Academia Sinica Academia Sinica Taipei Taiwan Department of Biomechatronics Engineering National Taiwan University Taipei Taiwan College of Engineering Chang Gung University Taoyuan Taiwan

Sprouting angiogenesis is an essential process for expanding vascular systems under various physiological and pathological conditions. In this paper, a microfluidic device capable of integrating a hydrogel matrix for cell culture and generating stable oxygen gradients is developed to study the sprouting angiogenesis of endothelial cells under combinations of oxygen gradients and co-culture of fibroblast cells. The endothelial cells can be cultured as a monolayer endothelium inside the device to mimic an existing blood vessel, and the hydrogel without or with fibroblast cells cultured in it provides a matrix next to the formed endothelium for three-dimensional sprouting of the endothelial cells. Oxygen gradients can be stably established inside the device for cell culture using the spatially-confined chemical reaction method. Using the device, the sprouting angiogenesis under combinations of oxygen gradients and co-culture of fibroblast cells is systematically studied. The results show that the oxygen gradient and the co-culture of fibroblast cells in the hydrogel can promote sprouting of the endothelial cells into the hydrogel matrix by altering cytokines in the culture medium and the physical properties of the hydrogel. The developed device provides a powerful in vitro model to investigate sprouting angiogenesis under various in vivo-like microenvironments. © 2023 The Authors

关键词： Endothelial cells

来源：评论

学校读者我要写书评

暂无评论

Automated Scoring of Liver Fibrosis through Combined Features from Different Collagen Groups

Automated Scoring of Liver Fibrosis through Combined Feature...

引用

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

作者： Shuoyu Xu Dean Tai Aileen Wee Roy Welsch Peter So Hanry Yu Jagath Rajapakse Computation and System Biology Program Histoindex Pte.Ltd. Department of Pathology Yong Loo Lin School of Medicine National University of Singapore National University Hospital Sloan School of Management Massachusetts Institute of Technology Mechanical Engineering and Biological Engineering Massachusetts Institute of Technology Physiology Yong Loo Lin School of Medicine National University of Singapore Director of Bioinformatics Research Center School of Computer Engineering Nanyang Technological University

ISBN: (纸本)9781424441211

Liver biopsy remains the gold standard in monitoring progression of liver fibrosis associated with an abnormal increase in collagen. Descriptive scoring systems are still being widely used to grade biopsy samples. In this study, we propose a new set of features by clustering collagen fibers into three groups first based on their localization and connectivity properties, and then by extracting morphological features of collagen fibers. The new feature set is compared to the earlier features used in classification of liver fibrosis, which were based on the total amount of collagen fibers. Our results show that new features lead to more accurate grading of liver fibrosis.

关键词： Liver Fibrosis collagen fiber Scoring Scoring liver biopsy Collagen gold standard

来源：评论

学校读者我要写书评

暂无评论

Applying fuzzy functions and sequential coordination to optimization of machinery arrangement and pipe routing

引用

NAVAL ENGINEERS JOURNAL 1998年第6期110卷 43-54页

作者： Wu, BC Young, GS Schmidt, W Choppella, K Dr. Bi-Chu Wu:received a PhD in Mechanical Engineering from the University of Maryland College Park in 1991. She has worked on projects involving naval architecture design optimization solid mechanics and database development. Presently a senwr engineer with Angle Incorporated Dr Wu's research interests are in design optimization and fuzzy logic applications. Dr. Gin-Shu Young: a senior engineer with Angle Incorporated holds a PhD in Mechanical Engineering from the University of Maryland College Park. As a guest researcher with National Institute of Standards and Technologies from 1990 to 1993 he worked on vision-based navigation for autonomous vehicles. His experience also includes applications of optimization fuzzy logic neural network and genetic algorithm methods to engineering system design Mr. William Schmidt:co-founded Angle Incorporated in 1990 and has served as Vice PresidentlChiefScientist during this tame. He holds a B.Sc. in Applied Science from the Naval Acadt?my and an M.Sc. in Physics from the Naval Post Graduate School. He has cner 20 years experience in technical leadership material and personnel management. He has led the application of computer aided design (CAD) and Product Model Information Exchange to the shipbuilding industry. His experience also includes leading the amlication of model based operational analysis to support the Live Fire Test Program for DDG 51 Class Destroyers. Mr. Krishna M. Choppella:is a Sofware Engineer at Eidea Laboratories Incotporated where he works on componentbased distributed enterpvise frameworks. He has been involved in creating data analysis tools for the US Nay by integrating CAD modeis databases and graphical front ends. His work in the Masters degree program in Mechanical Engineering at the University of Texas at Austin was in di0ddase.r spectroscopy of combustion products in porous-matri burners. He received his Bachelors degree in Electrical Engineering in India. He was a Research Associate at the Centre for Laser Technology and Project Engi

Ship design is often multidisciplinary involving several design elements with various types of objectives and constraints (O/C) some easily described as mathematical formulas, others better modeled as descriptive assertions. This paper describes a method based on fuzzy functions and an integrated performance index to model O/C using descriptive assertions to be used with mathematical formulas in optimization. Another issue addressed in this paper concerns the coordination of design elements when sequentially coupled, that is, when one leads the other and the performance of the follower depends greatly on the design of the leader. Based on neuro-fuzzy techniques, the method described here coordinates and optimizes sequentially coupled elements. The two methods are applied to machinery arrangement (MA) and pipe routing (PR). Preliminary models for optimization of MA and PR are described considering convenience, producibility: engine room size, interference and location as factors in the O/C set. Some test results from MA/PR applications are presented and discussed. The methods are generic and can be extended to other elements in ship design. They are mutually independent and may be used separately Two advantages of their use are an improvement in overall performance and a reduction in the need for redesign of elements.

关键词： Optimization

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：