检索结果-内蒙古大学图书馆

Brazilian Power Electronics Conference, COBEP

作者： Jordan G. Trapp Luciano P. de Lima Felix A. Farret Felipe T. Fernandes Gleisson Balen Center of Studies in Energy and Environment (CEEMA) Post-Graduation Program in Electrical Engineering (PPGEE) Technological Center Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

This paper presents an emulation of fuel cell and photovoltaic modules based on the buck converter as a replacement of actual power sources for bench tests. This approach is suitable for power electronic designs involving power converters to interface source and DC loads or source and mains grid, without having available the real source. The output voltage of the buck converter is referred to lookup tables/equations with experimental data from actual sources under load variation to determinate the biasing curves and dynamic response. To validate the results, a comparison between simulated and practical results obtained from laboratory test with actual sources is performed. The energy source emulations with buck converters is a simple, safe, versatile, and effective way of physically representing DC sources for various laboratory tests.

关键词： Radiation effects Voltage control Mathematical model Fuel cells Transfer functions Emulation Laboratories

来源：评论

学校读者我要写书评

暂无评论

Bootstrapping neural network regression model for motor drive vibration optimization through Genetic Algorithm

Bootstrapping neural network regression model for motor driv...

引用

IET 8th International Conference on Computation in Electromagnetics (CEM 2011)

作者： F.H. Pereira D.A.P. Correa W. M. da Silva S.I. Nabeta Industrial Engineering Post Graduation Program Nove de Julho University Sao Paulo Brazil Navy Technology Center in Sao Paulo CTMSP Sao Paulo Brazil Electrical Machine and Drivers Laboratory GMAcq/USP São Paulo University Sao Paulo Brazil

This work proposes an optimization procedure based on a bootstrapped neural network interpolation approach and the Genetic Algorithm method. The bootstrapped neural network is used to generate designed data sets in order to estimate a mapping from input to output space in an intrinsic experiment in a motor drive vibration study. The optimization procedure is aimed to minimize the motor vibration by adjusting some drive control parameters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Educational robotics as a learning aid for disabled children

Educational robotics as a learning aid for disabled children

引用

Biosignals and Biorobotics Conference (BRC), ISSNIP

作者： Carlos Valadão Teodiano Freire Bastos Magdo Bôrtole Victor Perim Daniel Celino Fauzi Rodor Agda Gonçalves Humberto Ferasoli Electrical Engineering Post-Graduation Program Universidade Federal do Espirito Santo Fernando Ferrari Av. 514 Vitória Brazil Universidade Estadual Paulista Av. Eng. Luiz Edmundo C. Coube 14-01 Bauru SP Brazil

Severe disabled children have little chance of environmental and social exploration and discovery, and due this lack of interaction and independency, it may lead to an idea that they are unable to do anything by themselves. This idea is called “learned helplessness” and is very negative for the child cognitive development and social development as well. With this entire situation it is very likely that the self-steam and mood of this child. Trying to help these children on this situation, educational robotics can offer and aid, once it can give them a certain degree of independency in exploration of environment. The system developed in this work allows the child to transmit the commands to a robot. Sensors placed on the child's body can obtain information from head movement or muscle pulses to command the robot to carry the tasks. Also, this system can be used with a variety of robots, being necessary just a previous configuration. It is expected that, with the usage of this system, the disabled children have a better cognitive development and social interaction, balancing in a certain way, the negative effects of their disabilities.

关键词： Robot sensing systems Manipulators Software Glass Computers

来源：评论

学校读者我要写书评

暂无评论

Digital control system using a thermoelectric cell for temperature electronic devices testing

Digital control system using a thermoelectric cell for tempe...

引用

IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： João P. Bazzo Jean C. C. Silva Emerson G. Carati Marcio Vogt Tiago Lukasievicz Electrical Engineering Post-Graduation Program Federal University of Technology- Paraná Pato Branco PR Brazil

This paper presents a temperature digital control system for performance evaluation of electronic devices under different operating temperatures. The system is based on a thermoelectric module of Peltier effect, which is used for heating or cooling the device under test (DUT). A digital PI controller is designed through simulations with an electric model of the structure, developed in Simulink ® . Based on the parameters and results from simulations, the controller is implemented in Labview ® and experimental results are obtained using a servo amplifier like actuator.

关键词： Testing Data acquisition Heating Heat transfer Hardware Heat sinks Actuators

来源：评论

学校读者我要写书评

暂无评论

An energy based LQR tuning approach applied for Uninterruptible Power Supplies

An energy based LQR tuning approach applied for Uninterrupti...

引用

IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： João Marcos Kanieski Emerson Giovani Carati Rafael Cardoso Electrical Engineering Post-Graduation Program Federal University of Technology - Paraná Pato Branco Paraná BR

This paper proposes a tuning method for a linear quadratic regulator (LQR) and its application to Uninterruptible Power Supplies (UPS). A performance index is established based on the desired behavior of system variables, such as maximum values permitted on the states and control law saturation. The tuning method is based on the Q and R weighting matrices, which relate the energy of the state variables involved on the process. From this index it is possible to find an optimal point to reach the required performance. The design procedure is exemplified with an output voltage control of an Uninterruptible Power Supply and dynamic results are presented.

关键词： Tuning Energy states Indexes Voltage control Bismuth

来源：评论

学校读者我要写书评

暂无评论

Repetitive control techniques applied to uninterruptible power supplies

Repetitive control techniques applied to uninterruptible pow...

引用

IEEE/IAS International Conference on Industry Applications (INDUSCON)

作者： Claudio Lucas Gnoatto Alcir Scarmin Emerson Giovani Carati Electrical Engineering Post-Graduation Program (PPGEE) Federal University of Technology Parana Pato Branco Parana Brazil

This paper presents recent repetitive control (RP) techniques applied to uninterruptible power supplies (UPS). A proportional-derivative (PD) technique including a feedforward term is implemented as the main controller. In addition, recent repetitive control laws are presented and applied to a single phase PWM inverter. It is also presented a new RP approach for repetitive gain adaptation in the presence of cyclic and random disturbances. Results demonstrate the efficiency of each control approach.

关键词： Uninterruptible power systems Strontium Robustness Pulse width modulation Inverters Load modeling Transient response

来源：评论

学校读者我要写书评

暂无评论

Wavelet-based algebraic multigrid method using the lifting technique

引用

Journal of Microwaves and Optoelectronics 2010年第1期9卷 1-9页

作者： Pereira, Fabio Henrique Nabeta, Silvio Ikuyo Industrial Engineering Post Graduation Program Uninove University - SP Brazil Electrical Machine and Drives Lab São Paulo University GMAcq/USP - SP Brazil

This paper presents a progress in the development of a recent and promising wavelet-based Algebraic Multigrid method. This new approach uses the lifting technique for creating an algorithm with smaller memory requirement and a reduced number of floating point operations, if long filters are used, keeping the efficiency of the multigrid technique, which is tested in the TEAM 28 Problem. The Incomplete Cholesky and Incomplete LU preconditioners are used for comparison. © 2010 SBMO/SBMag.

关键词： Discrete wavelet transforms

来源：评论

学校读者我要写书评

暂无评论

Antibiotic prescription in a teaching hospital: a brief assessment

引用

Revista da Associação Médica Brasileira (English Edition) 2011年第4期57卷 414-417页

作者： Marcelo Carneiro Tanise Ferraz Marina Bueno Bruna Elisa Koch Camyla Foresti Virginia F. Lena Janete A. Machado Janine M. Rauber Eliane C. Krummenaauer Dóris M. Lazaroto Infectologist M.Sc. in Microbiology Universidade Estadual de Londrina (UEL) Ph.D. Student in Medicine/Medical Sciences Universidade Federal do Rio Grande do Sul (UFRGS) Assistant Professor of Infectology Universidade de Santa Cruz do Sul (UNISC) President of Associação Gaúcha de Profissionais em Controle de Infecção Hospitalar (2001–2013) CCIH Coordinator Hospital Santa Cruz (HSC) Santa Cruz do Sul RS Brazil Medical Students at UNISC Interns at CCIH-HSC Santa Cruz do Sul RS Brazil Nurse Technician HSC Santa Cruz do Sul RS Brazil M.Sc. in Pharmaceutical Sciences UFRGS Pharmacist CCIH-HSC Santa Cruz do Sul RS Brazil Vice-coordinator Nurse of CCIH-HSC Post-graduation Program Professor UNISC Santa Cruz do Sul RS Brazil General Surgeon M.Sc. in Production Engineering UFRGS Assistant Professor of Surgery UNISC Santa Cruz do Sul RS Brazil

Objective Antimicrobials are used interchangeably in medical practice, contributing to the emergence of resistant microbial strains. Methods This study describes the antimicrobial audit performed by forecasting analysis of medical records of 846 patients at the Hospital Santa Cruz, Santa Cruz do Sul - Rio Grande do Sul - Brazil. Results Of the patients studied, 134 (15.8%) received antimicrobials. The audit was conducted interactively, with intervention and discussion with the prescriber. Considering the presumptive diagnosis and prescribed drug, it was verified that 74.6% of patients on antimicrobials received what was considered the first choice treatment. Inadequate antimicrobial agent for clinical diagnosis (5.2%) and lack of adjustment for renal function (43.7%) were the most frequent errors. Conclusion A strategic plan aimed at the rational use of antimicrobials based on educational and interventionist practices can help the infection control professional to adjust the routines to improve healthcare quality.

关键词： Clinical audit infection control services, hospital hospital infection control program anti-bacterial agents

来源：评论

学校读者我要写书评

暂无评论

An efficient two-level preconditioner based on lifting for FEM-BEM equations

引用

Journal of Microwaves and Optoelectronics 2010年第2期9卷 78-88页

作者： Pereira, Fabio Henrique Afonso, Marcio Matias De Vasconcelos, João Antônio Nabeta, Silvio Ikuyo Industrial Engineering Post Graduation Program UNINOVE University São Paulo Brazil Electrical Engineering Department Federal Technology Education Center CEFET Minas Gerais Brazil Electrical Engineering Department UFMG Minas Gerais Brazil Electrical Machine and Drives Lab São Paulo University GMAcq/USP São Paulo Brazil

The system resulting from the coupled Finite Element Method and Boundary Element Method formulations inherits all characteristics of both finite element and boundary element equation system, i. e., the system is partially sparse and symmetric and partially full and nonsymmetric. Consequently, to solve the resulting coupled equation system is not a trivial task. This paper proposes a new efficient lifting-based two level preconditioner for the coupled global system. The proposed approach is applied to solve the coupled systems resulting from the electromagnetic scattering problem and its performance is evaluated based on the number of iterations and the computational time. Traditional methods based on incomplete and complete LU decompositions are used for comparison. © 2010 SBMO/SBMag.

关键词： Boundary element method

来源：评论

学校读者我要写书评

暂无评论

Magnetic field transducers based on the phase characteristics of GMI sensors and aimed at biomedical applications

引用

13th International Conference on Biomedical engineering, ICBME 2008

作者： Silva, E. Costa Gusmão, L.A.P. Barbosa, C. R. Hall Monteiro, E. Costa Post Graduation Program in Metrology Pontifícia Universidade Católica do Rio de Janeiro Brazil Electrical Engineering Department Pontifícia Universidade Católica do Rio de Janeiro Brazil

ISBN: (纸本)9783540928409

For the last four years the Laboratory of Biometrology of PUC-Rio has been working in the development of magnetic field transducers to be used in biomedical applications - especially in the three-dimensional localization of needles inserted in the human body and in the measurment of arterial pulse waves. While previous investigations were based on the behavior of the magnitude of the impedance of Giant Magnetoimpedance (GMI) ribbon-shaped sensors, this manuscript presents the preliminary results of a new research that considers the changes in the phase characteristics of GMI sensors due to varying low-intensity magnetic fields. In spite of being less explored in the literature, the work carried out so far indicates that the sensitivity of the phase can lead to more promising results than the ones already obtained with transducers based on the variation of the impedance magnitude. By means of examples showing that the sensitivity of the phase is affected by parameters (amplitude, frequency and DC level) of the AC biasing current that flows throught the sensor, this manuscript discusses how an ideal stimulation condition was derived in order to obtain more sensitive transducers. It is also examined the influence of the ribbon length in the sensitivity. A new conditioning electronic circuit - responsible for the excitation and measurement of the GMI sensor, and designed to work in the 100kHz to 5Mhz range - has been developed and is presented in the manuscript. Simulation studies of the complete transducer, including the conditioning circuit and based on data obtained from measured curves, have shown that an improvement of 10 to 100 times can be expected when compared to the sensitivity of previous magnitude-based transducers.

关键词： Transducers

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：