检索结果-内蒙古大学图书馆

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Savchenko, Vitaliy Synyavskiy, Oleksandr Nesvidomin, Andriy National University of Life and Environmental Sciences of Ukraine Department of Electroenergetics Electrotechnics and Electromechanics Kyiv Ukraine National University of Life and Environmental Sciences of Ukraine Department of Descriptive Geometry Computer Graphics and Design Kyiv Ukraine

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

Pre-sowing treatment of sunflower seeds in a magnetic field improves its sowing qualities, plant biometrics and yield, which can be explained by increasing the rate of chemical reactions in seeds, solubility of salts and acids, permeability of cell membranes, increased transport of ions, oxygen and water. Based on the obtained analytical dependences and experimentally the regime parameters of sunflower seed treatment and their optimal values was determined: magnetic induction 0.065 T, magnetic field gradient 0.57 T/m (pole division 0.23 m), fourfold re-magnetization, seed velocity 0.4 m/s, which provides energy dose of seed treatment 3.8 J.s/kg. It is established that the change in the biopotential of sunflower seeds can determine the efficiency of their treatment in a magnetic field and determine the change in activation energy, which does not exceed 3.28 kJ/g-eq. Using the optimal parameters of sunflower seed treatment in a magnetic field, an device for pre-sowing treatment of sunflower seeds in a magnetic field was designed and manufactured, the use of which increases germination energy by 28 %, germination by 24 %, sunflower yield by 26 %. © 2022 IEEE.

关键词： Germination

来源：评论

学校读者我要写书评

暂无评论

Caustics of developable surfaces

引用

Frontiers of Information Technology & Electronic Engineering 2022年第3期23卷 479-487页

作者： Miklos HOFFMANN Imre JUHASZ Ede TROLL Institute of Mathematics and Computer Science Eszterhazy Karoly UniversityEger 3300Hungary Department of Computer Graphics and Image Processing University of DebrecenDebrecen 4010Hungary Department of Descriptive Geometry University of MiskolcMiskolc 3515Hungary

While considering a mirror and light rays coming either from a point source or from infinity,the reflected light rays may have an envelope,called a caustic *** this paper,we study developable surfaces as *** caustic surfaces,described in a closed form,are also developable surfaces of the same type as the original mirror *** provide efficient,algorithmic computation to find the caustic surface of each of the three types of developable surfaces(cone,cylinder,and tangent surface of a spatial curve).We also provide a potential application of the results in contemporary free-form architecture design.

关键词： Caustics Developable surface Reflected light rays Curve of regression

来源：评论

学校读者我要写书评

暂无评论

The use of modeling in the teaching of geometry and graphic disciplines at the University 2

The use of modeling in the teaching of geometry and graphic ...

引用

2nd International Scientific and Practical Conference on Information Technologies and Intelligent Decision Making Systems, ITIDMS 2021

作者： Vanshina, Ekaterina A. Shevchenko, Olga N. Malikova, Olga N. Staselko, Oksana L. Shusharina, Irina V. Associate Professor of Department of Descriptive Geometry Engineering and Computer Graphics FSBEI Orenburg State University Pobedy Ave. 13 Orenburg460018 Russia Department of Descriptive Geometry Graphics FSBEIHE Industrial University of Tyumen UL. Lunacharskogo 2 Tyumen625001 Russia

1. Introduction: In connection with the introduction of new Federal state educational standards of higher education (FSES) to teachers of geometry graphic departments there was a problem with the revision of the contents and methodology of teaching disciplines "descriptive geometry", "Engineering and computer graphics", foundations of engineering education aimed at formation of basic knowledge for studying of the subsequent disciplines used graphic representation of information. The analysis of special literature has indicated that, despite the significant number of scientific publications on the research topic, the use of modeling in teaching geometric-graphic disciplines requires separate research. 2. Materials and methods: Study and analysis of scientific, educational and special literature on the research topic, comparison, systematization, synthesis, generalization. 3. Results: To implement modern teaching methods in the educational process in the geometric-graphic disciplines, the author applied the functionality of the system KOMPAS-3D and developed by: electronic slides based on the modeling included in the evaluation funds for engineering and computer graphics;set a clear three-dimensional (3D) models of twenty-assemblies products intended for assignments on practical and laboratory lessons on the computer in the system KOMPAS-3D to create an Assembly and working drawings;set of individual tasks designed to practical assignments on the computer in this system to create 2D-models of assemblies (Assembly drawings) and 2D models details (working drawings), associated with their three-dimensional models. 4. Discussion and Conclusions: Design and creation of didactic materials based on three-dimensional and flat modeling tools, methods and algorithms of computer graphics in the system KOMPAS-3D, their use in teaching geometric-graphic disciplines, the inclusion in the evaluation funds on descriptive geometry, engineering and computer graphics, contributes to the

关键词： geometry

来源：评论

学校读者我要写书评

暂无评论

Investigation of Microclimate Parameters in the Industrial Environments

Lecture Notes on Data Engineering and Communications Technol...

引用

Lecture Notes on Data Engineering and Communications Technologies 2023年 180卷 448-457页

作者： Liaskovska, Solomiya Gumen, Olena Martyn, Yevgen Zhelykh, Vasyl Department of Artificial Intelligence Lviv Polytechnic National University Kniazia Romana Street 5 Lviv79905 Ukraine Department of Descriptive Geometry Engineering and Computer Graphics Peremohy pr National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" 37 Kyiv03056 Ukraine Department of Project Management Information Technologies and Telecommunications Lviv State University of Life Safety Kleparivska Street 35 Lviv79007 Ukraine Department of Heat and Gas Supply and Ventilation St. Bandery Lviv Polytechnic National University 12 Lviv13 79013 Ukraine

Researches on the organization and implementation of the project management of selection processes and the development of adequate models of interaction of many parameters of the microclimate of the technological process of raising the poultry meat breeds in industrial premises have been carried out. Actuality of the researches has been confirmed, the analysis and a choice of interaction of parameters research methods are proved. It is shown that the use of physical modeling with the involvement of the corresponding experimental equipment and the use of the experimental results obtained for geometric modeling on the basis of applied multidimensional geometry are effective. The significance of the study is in the established features of the nature of the heat exchange of air in the premises in view of the effectiveness of growing products and in various types of farming. The method of measuring the temperature in the room chosen in the process of geometric modeling allows to cover with lines of the same temperature all points of the living space of the production premises in which the bird is *** proposed method of research can be practically adapted for the processing of the results of studies on the microclimate parameters of agro-industrial objects of various intended uses. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Project management

来源：评论

学校读者我要写书评

暂无评论

Improving efficiency energy systems-photovoltaic modules and solar collectors in construction 3

Improving efficiency energy systems-photovoltaic modules and...

引用

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Martynov, Viacheslav Ploskyi, Vitalii Sergeychuk, Oleg Virchenko, Gennadii Usenko, Valery Tereschuk, Mykola Kyiv National University of Construction and Architecture Department of Architectural Constructions Kyiv03037 Ukraine National Technical University of Ukraine «igor Sikorsky Kyiv Polytechnic Institute» Department of Descriptive Geometry Engineering and Computer Graphics Kyiv03056 Ukraine National University «yuri Kondratyuk Poltava Polytechnic» Department of Construction and Civil Engineering Poltava36040 Ukraine

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

A method is proposed for increasing the efficiency of using energy systems (photovoltaic modules, solar collectors) due to the optimal location on the building envelope. A mathematical and graphical model has been developed, the Gelioopt program has been developed to determine the optimal orientation and area parameters for photovoltaic modules. A method is proposed for a quick graphical determination of the amount of converted solar energy by photovoltaic modules, and solar collectors, depending on the spatial orientation of solar receivers using building drawings. The proposed developments make it possible to simplify the calculation procedure and increase the determining of optimal parameters speed for solar receivers and is a proposed new type of geometric models. © 2022 IEEE.

关键词： Solar power generation

来源：评论

学校读者我要写书评

暂无评论

Investigation of Industrial Bearing Fault Diagnosis Based on 1D-Cnn-Lstm

Investigation of Industrial Bearing Fault Diagnosis Based on...

引用

International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

作者： Eduard Muratbakeev Diana Novak Yuriy Kozhubaev Department of Descriptive Geometry and Graphics Empress Catherine II Saint Petersburg Mining University Saint Petersburg Russia Department of Informatics and Computer Technologies Empress Catherine II Saint Petersburg Mining University Saint Petersburg Russia Department of Electrical Power Engineering and Electromechanics Empress Catherine II Saint Petersburg Mining University Saint Petersburg Russia

ISBN: (数字)9798331512194

ISBN: (纸本)9798331512200

This paper investigates a hybrid model method based on one-dimensional convolutional neural network (1DCNN) and long short-term memory (LSTM) network for fault diagnosis of industrial bearings. Based on a bearing dataset provided by Southeastern University, feature extraction and fault classification based on vibration signal data under different operating conditions were performed. The 1D-CNN module extracts local features from the signal in the time domain, while the LSTM module additionally captures the time dependence of the signal to improve the accuracy of fault diagnosis. Experimental results show that the model can effectively distinguish different types of bearing faults, exhibits good classification performance on the test set, and is highly robust to noise. This method provides an effective deep learning-based solution for industrial bearing fault diagnosis and has good application prospects.

关键词： Fault diagnosis Vibrations Training Accuracy Memory management Feature extraction Data models Stability analysis Convolutional neural networks Long short term memory

来源：评论

学校读者我要写书评

暂无评论

Fault Diagnosis of Mining Machine Gearboxes Based on Continuous Wavelet Transform and Machine Learning

Fault Diagnosis of Mining Machine Gearboxes Based on Continu...

引用

International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

作者： Eduard Muratbakeev Yuriy Kozhubaev Cheng Haodong Department of Descriptive Geometry and Graphics Empress Catherine II Saint Petersburg Mining University Saint Petersburg Russian Federation Department of Electrical Power Engineering and Electromechanics Empress Catherine II Saint Petersburg Mining University Saint Petersburg Russian Federation Institute of Computer Science and Cybersecurity Peter the Great St. Petersburg Polytechnic University Saint Petersburg Russian Federation

ISBN: (数字)9798331512194

ISBN: (纸本)9798331512200

This paper proposes a gearbox fault diagnosis method based on CWT-CNNN-LSTM. Continuous wavelet transform (CWT) transforms the original 1D vibration signal into a 2D time-frequency diagram with richer fault feature information. The 2D time-frequency diagram is then input into the convolution layer to complete the automatic feature extraction, and then the extracted features are input into the LSTM model for fault classification. After verification by the gearbox dataset published by Southeast University of China, this method can identify the fault type and load transformation of the gearbox with high accuracy, which has certain practical significance. With the acceleration of the intelligentization and automation of coal mines, motors and gearboxes are indispensable equipment in coal production, and the stability of their operating status is directly related to the safety and efficiency of coal production. However, as one of the common industrial equipment, the gearbox is more likely to fail due to various reasons during long-term operation compared to the motor. Once such a failure occurs, if it is not discovered and handled in time, it will cause damage to the mining equipment, thus affecting the entire coal mining process. Therefore, real-time fault prediction of gearboxes has important practical significance.

关键词： Fault diagnosis Vibrations Time-frequency analysis Continuous wavelet transforms Accuracy Production Feature extraction Motors Convolutional neural networks Long short term memory

来源：评论

学校读者我要写书评

暂无评论

Influence of Voltage Deviation and Asymmetry on Transitional Processes in Asynchronous Electric Drive 20

Influence of Voltage Deviation and Asymmetry on Transitional...

引用

20th IEEE International Conference on Modern Electrical and Energy Systems, MEES 2021

作者： Savchenko, Vitaliy Synyavskiy, Oleksandr Dudnyk, Alla Nesvidomin, Andriy National University of Life and Environmental Sciences of Ukraine Department of Electroenergetics Electrotechnics and Electromechanics Kyiv Ukraine National University of Life and Environmental Sciences of Ukraine Department of Automatics and Robototechnical Systems Kyiv Ukraine National University of Life and Environmental Sciences of Ukraine Department of Descriptive Geometry Computer Graphics and Design Kyiv Ukraine

ISBN: (纸本)9781665423663

Investigations of electromagnetic and electromechanical transients in an asynchronous electric drive with voltage deviation and asymmetry have been carried out. Analytical expressions are obtained that describe the transients in an asynchronous electric drive with a shock load at voltage deviation and *** the voltage decreases and asymmetries, the electromechanical constant of time increases, and as the voltage increases, electromechanical constant decreases. As a result, in drives with a small electromechanical time constant, increasing the voltage can cause torques and speed to fluctuate, while reducing and asymmetry can eliminate *** electric drives with a large moment of inertia, the transient process is aperiodic. When the voltage is higher than the nominal one, the duration of the transient process decreases, and when the voltage decreases and asymmetries, duration of the transient process *** decrease and asymmetry of the voltage causes a decrease in the steady angular speed compared to the nominal, and an increase in voltage - angular speed increase. © 2021 IEEE.

关键词： Electric drives

来源：评论

学校读者我要写书评

暂无评论

Modeling of Influence of Shupe Effect on Fiber-Optic Goniometer with different coil winding types 3

Modeling of Influence of Shupe Effect on Fiber-Optic Goniome...

引用

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Ivanov, Sergiy Oliinyk, Pavlo Virchenko, Gennadii Vanin, Volodymyr Tereschuk, Mykola Research and Development Institute of Telecommunications National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Department of Descriptive Geometry Engineering and Computer Graphics Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Faculty of Physics and Mathematics Kyiv Ukraine Kyiv National University of Construction and Architecture Department of Architectural Constructions Kyiv Ukraine

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

One of key errors of the classic interference-type fiber-optic goniometer is the thermo-optical zero shift. Its caused by the non-uniform change of temperature of different fiber sections in the loop under the influence of temperature;as a result of that, counter-rotating waves get different phase incursions during stretching of fiber in the loop, thus creating thermo-optical zero shift (Shupe effect). Difference of the phase incursions of counter-rotating waves is the bigger the higher speed of fiber length change is, and the higher difference of delay time of those waves. The current study is focused on the modeling of influence of the Shupe effect on on the precision of the fiber optic goniometer. The key features of the goniometer mentioned are use of the copper coil carcass and compound with high thermal conductivity (use of nanotubes is desired). Different coil winding types (simple, dipole quadrupole, modified quadrupole, bifilar, octupole) are considered from the point of view of minimizing the thermo-optical zero shift under self-heating and influence of the ambient temperature changes. Analysis is based on the transient thermal analysis of finite element model of the goniometer performed in ANSYS environment with subsequent data import and integration of phase incursion, calculated based on temperature data, along the fiber length. Study results show that best results during self-heating gives the use of quadrupole winding, at that goniometer's zero shift changes insignificantly (about 0.08°, compared to 1,35° for the simple winding). Change of ambient temperature for a given design has almost no influence on the zero shift, as device is heated uniformly. One should note that as during modeling not all factors could be taken into account, the result obtained should be checked and qualified during FOG tests. © 2022 IEEE.

关键词： 3D modeling

来源：评论

学校读者我要写书评

暂无评论

Application of binary classification of magnetic resonance therapy images to detect the threat of the disease due to COVID-19 3

Application of binary classification of magnetic resonance t...

引用

3rd IEEE KhPI Week on Advanced Technology, KhPI Week 2022

作者： Zalevska, Olga Vanin, Volodymyr Sydogenko, Julia Finogenov, Oleksii Demydenko, Olga Yablonskyi, Petro Ladogubets, Tetyana Oliinyk, Yurii Miroshnichenko, Ivan National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Department of Automation of Power Processes and Systems Engineering Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Department of Descriptive Geometry Engineering and Computer Graphics Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Department of Computer-Aided Science and Data Processing Systems Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' The Department of Theory Practice and Translation of English Kyiv Ukraine National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute' Deprtament of Applied Mathematics Kyiv Ukraine

ISBN: (数字)9798350399202

ISBN: (纸本)9798350399202

The paper considers the use of a neural network for the binary classification of magnetic resonance imaging images to establish a possible disease of COVID-19. Processing of input data and their reduction to one format is provided, and neural network software for binary classification is developed and its training based on about 60,000 open patient images. The using of developed software is universal for medical doctors or ordinary Internet users and does not require additional training. © 2022 IEEE.

关键词： Magnetic resonance imaging

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：