检索结果-内蒙古大学图书馆

15th International Conference on Optical Methods of Flow Investigation, OMFI 2019

作者： Burlakov, A.B. Shirokov, S.V. Khokhlov, D.D. Kuzmin, V.I. Gadzaov, A.F. Department of Ichthyology Faculty of Biology Moscow Lomonosov State University Leninskie Gory GSP-1 Moscow119991 Russia Laboratory of Acousto-optic Spectroscopy Scientific and Technological Center of Unique Instrumentation Russian Academy of Sciences 15 Butlerova Moscow117342 Russia Department of Electrical Engineering and Introscopy Institute of Automatics and Computer Engineering National Research University Moscow Power Engineering University Krasnokazarmennaya street 14 Moscow111250 Russia 78 Vernadskiy avenue Moscow119454 Russia Moscow Technological University 38a Leninskii avenue Moscow119334 Russia

The task of analyzing the characteristics of the embryonic development of lower vertebrates using non-invasive optical methods is considered. We propose to apply hyperspectral imaging for segmentation of embryo zones with different physical and chemical properties. This approach allows one to obtain information on the spatial distribution of optical spectral properties of the observed object. An experimental setup based on a microscope coupled with a spectral imaging add-on module utilizing a tunable acousto-optic filter has been created to implement this approach. Hyperspectral data arrays are formed as a series of spectral narrowband images obtained by successive tuning of the acousto-optic filter within the working spectral range. A series of experiments was conducted in which the development of embryos of the Misgurnus fossilis loach during their transition from the 32nd to the 33rd developmental stage was observed using the described experimental setup. Characteristic spatial regions corresponding to certain parts of the loach embryo were identified. The time dependences characterizing the change in the spectral properties of the selected regions were obtained. It is shown that joint processing of a series of spectral images obtained in different spectral bands within the working spectral range of an acousto-optical spectral imaging module allows one to effectively identify differences in the kinetics of the optical transmission spectral density for various regions of the axial mesoderm. © Published under licence by IOP Publishing Ltd.

关键词： Hyperspectral imaging

来源：评论

学校读者我要写书评

暂无评论

Unintended synchronisation between rotational speed and PWM frequency in a PM BLDC drive unit

Unintended synchronisation between rotational speed and PWM ...

引用

International Conference on Methods and Models in Automation and Robotics

作者： Andrzej Tutaj Tomasz Drabek Tomasz Dziwinski Jerzy Baranowski Pawel Piatek Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow

In an electric drive with a three-phase PM BLDC motor, tasks of PWM modulation and six-step or twelve-step commutation of phases are usually combined and carried out by an MCU or CPU-controlled MOSFET or IGBT transistor bridge. That approach cuts down electronic element count, decreases size and price of the inverter and reduces power losses. However, at the same time it can also give rise to an undesired phenomenon of a spontaneous synchronisation (locking) between the motor rotational speed and the PWM frequency. An inverter-motor drive system may behave like an unintended phase-locked loop (PLL), endeavouring to keep a constant ratio between the six-step commutation frequency and the PWM modulation frequency. Resulting nonlinearity, discontinuity, hysteresis and nonuniqueness of the drive unit mechanical characteristic makes it difficult to develop a controller algorithm. The paper shows this unexpected and unwanted effect and investigates its causes.

关键词： Six-step commutation PWM PM BLDC drive Combined commutation and modulation Phase-locked loop

来源：评论

学校读者我要写书评

暂无评论

Modelling and Analysis of Currents Flowing in High Voltage Power Substations During Ground Short - Circuits

Modelling and Analysis of Currents Flowing in High Voltage P...

引用

Selected Problems of Electrical engineering and Electronics (WZEE)

作者： Jakub Gajdzica Wieslaw Nowak Waldemar Szpyra Rafał Tarko Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland

ISBN: (纸本)9781538683002

This article presents a method for determining the distribution of ground short-circuits in high voltage substations, in particular determining the value of currents flowing into substations grounding. Knowledge of these currents is important to assess the risk of electric shock hazard within the substation area. The EMTP-ATP program was used in the research, in which the structure of the analyzed systems was created. The results of calculations made for a selected high voltage substation in various work configurations are presented.

关键词： Substations Grounding Switches Short-circuit currents Wires Poles and towers Conductors

来源：评论

学校读者我要写书评

暂无评论

Heat distribution in the deep drawing device components working by high temperatures 10

Heat distribution in the deep drawing device components work...

引用

10th International Conference Machine and Industrial Design in Mechanical engineering, KOD 2018

作者： Tropp, M. Brumerčík, F. Šteininger, J. Weis, P. Glowacz, A. Univerzity of Žilina Faculty of Mechanical Engineering Department of Design and Mechanical Elements Univerzitná 1 Žilina010 26 Slovakia AGHUniversity of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Al. A. Mickiewicza 30 Kraków30-059 Poland

The subject of the article is a simulation of heat affected components of a device for deep drawing by extreme conditions in vacuum by high temperatures required for forming of crystallization containers made from thin molybdenum sheets. The simulation is focused on the distribution of heat in particular components in relation with their shape. There are presented the design of working components and the boundary conditions of transient thermal simulations with the results. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Deep drawing

来源：评论

学校读者我要写书评

暂无评论

Binary Classifier for Fault Detection Based on KDE and PCA

Binary Classifier for Fault Detection Based on KDE and PCA

引用

International Conference on Methods and Models in Automation and Robotics

作者： Tian Cong Jerzy Baranowski Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland

Fault detection in process condition monitoring aims to declare anomalies strayed from the operation expectancy. With the number of variables increasing, the complexity of detection task grows quickly. The algorithm, Binary Classifier for Fault Detection (BaFFle), is devised to employ Principal Component Analysis (PCA) to reduce the number of variables and to detect the occurrences of fault over each distinct component using corresponding operation model. In this way, BaFFIe converts a multivariate detection task into several univariate problems. Since the observations of a steady-state system are supposed to subject to certain probability distribution, the normal operation model is represented by probability distribution. In the original BaFFIe algorithm, measured data is assumed Gaussian distribtued. In order to get rid of the strong assumption in BaFFIe, an improved BaFFIe is proposed in this paper to estimate the distribution model by Kernel Density Estimation (KDE). A main advance of KDE is attributed to the non-parametric way of estimating probability distribution, resulting in a data-driven estimator. Experiments using real data from a multiphase flow rig proved the validation of KDE-based BaFFIe. From the practice perspective, BaFFIe has the potential of being applied to operation systems with non-Gaussian distributions.

关键词： Binary classifier for fault detection (BaFFle) Kernel density estimation (KDE) Principal component analysis (PCA) Process condition monitoring

来源：评论

学校读者我要写书评

暂无评论

Preface

Lecture Notes on Data Engineering and Communications Technol...

引用

Lecture Notes on Data engineering and Communications Technologies 2020年 37卷 v-vi页

作者： Borah, Samarjeet Balas, Valentina Emilia Polkowski, Zdzislaw Department of Computer Application SMIT Sikkim Manipal University Sikkim India Department of Automatics and Applied Software Faculty of Engineering Aurel Vlaicu University of Arad Arad Romania Faculty of Technical Sciences Jan Wyzykowski University Polkowice Poland

来源：评论

学校读者我要写书评

暂无评论

Preface

Advances in Intelligent Systems and Computing

引用

Advances in Intelligent Systems and Computing 2020年 1064卷 xiii-xiv页

作者： Jain, Lakhmi C. Piuri, Vincenzo Virvou, Maria Balas, Valentina E. Faculty of Engineering and IT University of Technology Sydney BroadwayNSW Australia Department of Computer Science University of Milan Milan Italy Department of Informatics University of Piraeus Piraeus Greece Department of Automatics and Applied Software University of Arad Arad Romania

来源：评论

学校读者我要写书评

暂无评论

Derivation of an Acoustic Two-Port Scattering Matrix for a Multimode Wave Applying the Single-Mode Generator

Derivation of an Acoustic Two-Port Scattering Matrix for a M...

引用

Joint Conference - Acoustics

作者： Anna Snakowska Karolina Kolber Łukasz Gorazd Jerzy Jurkiewicz Faculty of Mechanical Engineering and Robotics AGH University of Science and Technology Krakow Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland

The paper presents the procedure of experimental derivation of an acoustic two-port scattering matrix for a multimode wave propagating, for example, in a muffler of a complicated design, applying the single-mode generator. The self-designed single-mode generator is constructed in the form of a matrix of acoustic monopoles and is capable to generate a selected single mode. The scattering matrix formalism is a new approach to analyse the acoustical systems containing one or more duct-like elements (joints) connected by some undefined elements such as, for example, acoustic mufflers of different types and so the formalism is frequently applied to analyse the phenomena of noise reduction in such systems. Experimental derivation of the scattering matrix for a wave composed of N modes demands, in general, excitation of N different sound fields at each side of the two-port first. Finally the matrix composed of the modal pressures measurements obtained for each of the exited fields must be inversed to obtain the scattering matrix. Generating single N modes the matrix of the incoming pressure data is, theoretically, diagonal which makes derivation of the scattering matrix much easier. Generation of independent sound fields in the shape of single modes ensures the matrix to be well conditioned.

关键词： Ducts Scattering Acoustics Exhaust systems Junctions Generators Shape

来源：评论

学校读者我要写书评

暂无评论

Trends in Advanced Intelligent Control, Optimization and Automation: Proceedings of KKA 2017-The 19th Polish Control Conference, Kraków, Poland, June 18–21, 2017 19th

Trends in Advanced Intelligent Control, Optimization and Aut...

引用

19th Polish Control Conference, KKA 2017

作者： Mitkowski, Wojciech Kacprzyk, Janusz Oprzędkiewicz, Krzysztof Skruch, Pawel Department of Automatics and Biomedical Engineering Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Kraków Poland Systems Research Institute Polish Academy of Sciences Warszawa Poland

来源：评论

学校读者我要写书评

暂无评论

Fractional Differential Equation Solvers in Octave/Matlab

Fractional Differential Equation Solvers in Octave/Matlab

引用

International Conference on Methods and Models in Automation and Robotics

作者： Marcin Sowa Aleksandra Kawala-Janik Waldemar Bauer Faculty of Electrical Engineering Silesian University of Technology Gliwice Poland Faculty of Electrical Engineering Automatic Control and Informatics Opole University of Technology Opole Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Kraków Poland

This paper concerns solvers for time fractional differential equations in Matlab and Octave. The main analysis revolves around a time step size adaptive solver basing on the numerical method called SubIval. The basis of SubIval is explained and formulae for the step size adaptivity are given. The solver is compared with others basing on: fractional linear multistep methods, product integration rules and the Grunwald-Letnikov approximation.

关键词： Fractional calculus Differential equations Electrical engineering Electronic mail Matlab Capacitors Coils

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：