检索结果-内蒙古大学图书馆

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

On the Wear Intensity Ratio of a Striker under Dynamic and Static Conditions

On the Wear Intensity Ratio of a Striker under Dynamic and S...

引用

2019 International Science and Technology Conference on Earth Science, ISTCEarthScience 2019

作者： Bolobov, V. Chupin, S. Binh, Le Thanh Department of Mechanical Engineering Saint Petersburg Mining University Saint Petersburg Russia Department of Descriptive Geometry and Engineering Graphics Saint Petersburg Mining University Saint Petersburg Russia

The results of experiments on determination of the cylindrical part mass loss of the cone-shaped strikers made of 38XM (AISI P20), 8 (AISI W1-A), and X12MFA (AISI D2) steels, which have been subjected to heat treatment applied by the striking tools manufacturers, and additional cold treatment, with their friction and abrasive wear on granite, are presented. It was found that the strikers made of steel X12MFA with all types of heat treatment show the greatest wear resistance under the wear conditions (static conditions), while the strikers made of 38XM have the lowest wear resistance. Cryogenic treatment and, to a lesser extent, cold treatment increase the wear resistance of all materials. The comparison of set values of wear resistance I st and hardness HV of the strikers, as well as the analysis of their microstructure allows to conclude that wear resistance of a tool depends not only on its hardness, but also on the type, volume, shape of carbides forming the structure of material used for tool manufacturing. For this reason, after the cryogenic treatment, the tool made of X12MFA steel shows the greatest wear resistance, because its material has the highest content of carbon (∼1.5%) and alloying elements (∼13%), which provides up to 10.8% increase in the number of fine carbide particles in its structure, that ensure wear resistance increase, after the cold treatment. The results obtained for I st are compared with the earlier obtained data on wear resistance of the same striker at striking upon granite (in dynamic conditions). The conclusion about similarity of the wear mechanisms of the analyzed strikers in dynamic and static conditions is made. © Published under licence by IOP Publishing Ltd.

关键词： Wear resistance

来源：评论

学校读者我要写书评

暂无评论

Study of Thermomechanical Behavior of Electrically Conductive Tubular Elements During Magnetic Impulse Processing

Study of Thermomechanical Behavior of Electrically Conductiv...

引用

International Conference on Perspective Technologies and Methods in MEMS Design (MEMSTECH)

作者： Roman Musii Nataliya Melnyk Veronika Dmytruk Inga Svidrak Beata Kushka Hanna Shayner Department of Mathematics Lviv Polytechnic National University Lviv Ukraine Department of Software Lviv Polytechnic National University Lviv Ukraine Department of Applied Mathematics Lviv Polytechnic National University Lviv Ukraine Department of Descriptive Geometry and Engineering Graphics Lviv Polytechnic National University Department of Foreign Languages Lviv Polytechnic National University Lviv Ukraine

ISBN: (纸本)9798350396812

The mathematical model of the thermo-stressed state of an electrically conductive tubular element influenced by a nonstationary electromagnetic field of impulse type has been proposed. The initial boundary value problems are formulated, and their general solutions are obtained for the key functions, which are the axisymmetric terms of the vector of magnetic field strength, the radial component of the displacement vector, and the temperature. A numerical study of the thermo-mechanical behavior of the considered element influenced by the action of an electromagnetic impulse is performed.

关键词： Micromechanical devices Magnetoelasticity Electromagnetic interference Thermomechanical processes Force Behavioral sciences Steel

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

Directions for Improving the Efficiency of Forest Clear Cutting on the Territories of Reservoirs and Waterworks under Construction 5

Directions for Improving the Efficiency of Forest Clear Cutt...

引用

5th Pan-Russian Scientific Technical Conference on Forests of Russia: Policy, Industry, Science and Education, FR 2020

作者： Kalyashov, V. Iliin, A. Shuvalova, S. Leonova, O. Shvetsova, V. Department of Descriptive Geometry and Engineering Graphics Saint Petersburg State University of Architecture and Civil Engineering 4 2nd Krasnoarmeiskaya Street Saint Petersburg190005 Russia Department of Water Energy and Ecological Feasibility JSC Lenhydroproject Ispitateley prospect 22 Saint Petersburg197227 Russia

The article deals with the issues of increasing the forest resources use extent on the forested areas of reservoirs' flooded territories of hydroelectric power stations (HPPs) - both projected and under construction- in multi-forest areas of the Russian Federation. The necessity of forest clear cutting and forest clearing carrying out on flooded territories and the importance of these measures for ensuring favorable environmental conditions in the area of hydro construction and in the water area of reservoirs are substantiated. The estimation of the wood volume cut in the process of reservoirs creation is presented and the reasons for leaving wood to be flooded are considered. The factors and circumstances that affect the indicators of economic efficiency of forest clear cutting are described. A comparative assessment of the applied technologies of forest clear cutting is made, ways to increase its profitability are outlined, and the impact of profitability on decision making on leaving wood to be flooded in the process of reservoirs' territory preparation is estimated. © Published under licence by IOP Publishing Ltd.

关键词： Reservoirs (water)

来源：评论

学校读者我要写书评

暂无评论

Optimal Complexity Models in Individual Control Strategy Task for Objects that Cannot be Re-trialed 14

Optimal Complexity Models in Individual Control Strategy Tas...

引用

14th IEEE International Scientific and Technical Conference on Computer Sciences and Information Technologies, CSIT 2019

作者： Nastenko, Ie. Pavlov, V. Nosovets, O. Zelensky, K. Davidko, Ol. Pavlov, Ol. Igor Sikorsky Kyiv Polytechnic Institute Department of Biomedical Cybernetics Kyiv Ukraine Igor Sikorsky Kyiv Polytechnic Institute Department of Descriptive Geometry and Computer Graphics Kyiv Ukraine

ISBN: (纸本)9781728108063

The conventional approach for calculating individual optimal strategies assumes that the best control actions are calculated for the same object that has been studied monitoring or active trials. However, the class of objects for which is impossible to organize repeated tests is widespread. An example is patients with a particular disease, for each of which it is impossible to organize the separate trials to study possible strategies for its cure. The paper proposes an approach for calculating the individual objects strategies, for which observational data obtained during the monitoring or active experiment on an objects sample is used. To construct an effective calculation technology is proposed to obtain the state models of the optimal complexity object, nonlinear on the parameters and initial conditions of the object and linear on control actions. Limitations of approach and an example of calculating an individual's strategy are considered. © 2019 IEEE.

关键词： Decision making

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

引用

Journal of Physics: Conference Series 2021年第1期2001卷

作者： Ekaterina A Vanshina Olga N Shevchenko Olga N Malikova Oksana L Staselko Irina V Shusharina associate Professor of Department of descriptive geometry engineering and computer graphics FSBEI 'Orenburg state University' 13 Pobedy Ave. Orenburg 460018 Russia head of the Department of descriptive geometry engineering and computer graphics FSBEI 'Orenburg state University' 13 Pobedy Ave. Orenburg 460018 Russia associate Professor of Department of descriptive geometry and graphics FSBEIHE 'Industrial University of Tyumen' 2 UL. Lunacharskogo Tyumen 625001 Russia senior lecturer of the Department of descriptive geometry and graphics FSBEIHE 'Industrial University of Tyumen' 2 UL. Lunacharskogo Tyumen 625001 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 t

关键词：

来源：评论

学校读者我要写书评

暂无评论

Information Technologies Used for Geometro-Graphical Training of Engineering Staff 4

Information Technologies Used for Geometro-Graphical Trainin...

引用

4th International Conference on Information Technologies in Engineering Education, Inforino 2018

作者： Stolbova, Irina Dmitrievna Shakhova, Alevtina Brunovna Shirinkina, Mariya Alekseevna Department of Design Graphics and Descriptive Geometry Perm National Research Polytechnic University Perm Russia

ISBN: (纸本)9781538658321

Emphasized is the requirement for search of new training technologies, conforming to the level of information-communication technologies development and meeting the requirements of up-to-date design and production technologies. Analysis has been carried out regarding functional capabilities of information technologies while forming geometro-graphical competences available in the course of basic graphical training of technical university students. Systemic use of information technologies package at different forms of studies is described. Versions of the technologies integration are demonstrated in sections of graphical training for students. Efficiency of their use is grounded. © 2018 IEEE.

关键词： Personnel training

来源：评论

学校读者我要写书评

暂无评论

Ocular hypertension in patients with central/hemicentral retinal vein occlusions： cumulative prevalence and management

引用

International Journal of Ophthalmology(English edition) 2018年第7期11卷 1173-1178页

作者： Dan Calugaru Mihai Calugaru Stefan Talu Department of Ophthalmology University of Medicine Cluj-Napoca 400467 Romania Department of AET Discipline of Descriptive Geometry and Engineering Graphics Faculty of Mechanical EngineeringTechnical University of Cluj-Napoca Cluj-Napoca 400012Romania

AIM： To prospectively evaluate the cumulative prevalence and the management of ocular hypertension（OH） in patients with unilateral acute central/hemicentral retinal vein occlusions（C/HCRVOs） over the course of 3 y. METHODS： The study included 57 patients with unilateral acute C/HCRVOs. All patients underwent a comprehensive ophthalmological examination of both eyes. OH associated with C/HCRVO in patients showing a score 〉5% for the risk of conversion to primary open angle glaucoma（POAG） was treated with OH medication. The treatment aimed for a decrease in intraocular pressure（IOP） to 〈21 mm Hg with a 〉22% reduction from the initial values. The cumulative prevalence of OH and the effectiveness of treatment assessed by the cumulative prevalence of conversion from OH to POAG, were estimated. RESULTS： Fifteen patients had OH associated with C/HCRVOs, the cumulative prevalence of OH was 29.4%（95% confidence interval, 16.9-41.9）. The mean value of the risk score of OH conversion to POAG for the 5 subsequent years was 11.7%±5.4%. The IOP significantly decreased from 25.67±2.16 mm Hg to 18.73±2.96 mm Hg. None of the OH patients converted to POAG during the follow-up period. CONCLUSION： The increased cumulative prevalence of OH in C/HCRVO patients indicates that OH is a risk factor for the appearance of venous occlusion. Patients with OH associated with C/HCRVO must be considered to be at high risk for conversion to POAG. Treatment with OH medications prevented conversion to POAG during the 3-year follow-up.

关键词： ocular hypertension acute central/hemicentral retinal vein occlusion intraocular pressure primary openangle glaucoma risk factor

来源：评论

学校读者我要写书评

暂无评论

Influence of thermomechanical treatment modes on wear resistance of mining equipment material

Influence of thermomechanical treatment modes on wear resist...

引用

International Scientific Conference on FarEastCon, ISCFEC 2018

作者： Chupin, S. Bolobov, V. Department of Descriptive Geometry and Engineering Graphics Saint Petersburg Mining University Saint Petersburg Russia Department of Mechanical Engineering Saint Petersburg Mining University Saint Petersburg Russia

ISBN: (纸本)9783035712926

This work presents results of experimental researches of influence of various hightemperature thermomechanical treatment (HTMT) modes in 35KhGSA steel – material applied in rock-destroying cutters – on hardness and wear rate for the most common abrasive rock in mining operations – sandstone. It has been found out that HTMT leads to increase of steel hardness and reduction of wear rate compared to heat treatment applied at manufacture of cutters. The maximal increase of hardness (by 23%) and reduction of wear rate (by 38%) corresponds to the mode of distortion accumulation of ∼1,5 at 900 ° at water quenching and tempering at 230 °C. A conclusion that thermomechanical treatment is an effective way to increase the wear resistance of steels applied in the conditions of abrasion wear has been drawn. © 2019 Trans Tech Publications, Switzerland.

关键词： Hardness

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：