Study on TE011 Mode’s Resonant Characteristic of Complicated Microwave Cavity with Ceramics Layer in Rubidium Frequency Standard

2012 ◽  
Vol 571 ◽  
pp. 137-142
Author(s):  
Xiao Xiao Li ◽  
Bin Zhao Cao
Keyword(s):  
Frequency Standard ◽  
Microwave Cavity ◽  
Mode Matching ◽  
Matching Method ◽  
Resonant Frequencies ◽  
Factors Influencing ◽  
Cavity Design ◽  
Main Factors ◽  
Resonant Characteristic ◽  
Good Agreement

Complicated microwave cavity loaded with ceramics is first investigated by mode matching method in rubidium frequency standard. In order to study main factors influencing resonant characteristics, resonant frequencies of TE011 mode are calculated and compared with commercial software (CST) results. The results show good agreement between theoretical computations and CST simulations. This work is of great significance for cavity design and theory perfection in atomic frequency standard.

Study on Resonant Properties for HE111 Mode of Complicated Microwave Cavity in Rubidium Frequency Standard under Different Parameters

2013 ◽  
Vol 373-375 ◽  
pp. 981-985
Author(s):  
Xiao Xiao Li ◽  
Shang Lin Hou ◽  
Jing Li Lei
Keyword(s):  
Resonant Frequency ◽  
Frequency Standard ◽  
Microwave Cavity ◽  
Matching Method ◽  
Complicated Structure ◽  
Resonant Frequencies ◽  
Cavity Design ◽  
Main Factors ◽  
High Credibility ◽  
Good Agreement

Microwave cavity with complicated structure and rubidium gas is studied by mode matching method. By calculating resonant frequencies of HE111mode under different parameters, main factors that influence resonant frequency is studied. In addition, the resonant frequency of HE111mode is compared with commercial software (CST) results. The computed results show good agreement with CST simulations. It can be seen that this method is of high credibility and efficiency. This paper is of great significance for cavity design and theoretical perfection.

TE0 Mode Resonant Properties of the Rubidium Clock Microwave Cavity Loaded with Ceramic Material

2013 ◽  
Vol 433-435 ◽  
pp. 2213-2217
Author(s):  
Xiao Xiao Li ◽  
Jin Li Lei ◽  
Guo Dong Ren
Keyword(s):  
Ceramic Material ◽  
Atomic Clock ◽  
Microwave Cavity ◽  
Matching Method ◽  
Resonant Frequencies ◽  
Factors Influencing ◽  
Rubidium Clock ◽  
New Type ◽  
Cavity Design ◽  
Main Factors

Resonant properties of a Microwave cavity with ceramic material for a new type of rubidium clock is studied by mode matching method. In order to study main factors influencing resonant characteristics, resonant frequencies of TE011 mode are calculated. In addition, the effect of the ceramic material on resonant frequency are also analyzed. This work is of great significance for cavity design and theory perfection in atomic clock.

Influence of Deformation Conditions on the Power Regimes of the Process of Cold Crimping of a Pipe Billet in a Conical Die

2019 ◽  
Vol 946 ◽  
pp. 812-817
Author(s):  
Andrey A. Udalov ◽  
Aleksander V. Udalov ◽  
Sergey V. Parshin
Keyword(s):  
Axial Stress ◽  
Open Circuit ◽  
Contact Deformation ◽  
Factors Influencing ◽  
Engineering Technique ◽  
Conical Die ◽  
Tubular Billet ◽  
Main Factors ◽  
Limiting Values ◽  
Good Agreement

An engineering technique has been developed that makes it possible to determine the power regimes of the process of crimping a tubular billet in a conical die, taking into account the effect of deformation conditions. The influence of the geometric parameters of the workpiece and tool, the crimping coefficient and non-contact deformation on the axial stress of the crimping process is studied. The main factors influencing the limiting values ​​of the workpiece crimping factor are established. Calculations are performed for the crimping process performed on an open circuit (without stop block), taking into account the friction and hardening of the material. The obtained results are in good agreement with the known experimental data and can be used in the development of the processes of crimping of pipe billets.

Tire Vibrations

1977 ◽  
Vol 5 (4) ◽  
pp. 202-225 ◽  
Author(s):  
G. R. Potts ◽  
C. A. Bell ◽  
L. T. Charek ◽  
T. K. Roy
Keyword(s):  
Natural Frequencies ◽  
Standing Waves ◽  
Resonant Mode ◽  
Mode Shapes ◽  
Resonant Vibrations ◽  
Resonant Frequencies ◽  
Radial Tire ◽  
Analysis Techniques ◽  
Thin Ring ◽  
Good Agreement

Abstract Natural frequencies and vibrating motions are determined in terms of the material and geometric properties of a radial tire modeled as a thin ring on an elastic foundation. Experimental checks of resonant frequencies show good agreement. Forced vibration solutions obtained are shown to consist of a superposition of resonant vibrations, each rotating around the tire at a rate depending on the mode number and the tire rotational speed. Theoretical rolling speeds that are upper bounds at which standing waves occur are determined and checked experimentally. Digital Fourier transform, transfer function, and modal analysis techniques used to determine the resonant mode shapes of a radial tire reveal that antiresonances are the primary transmitters of vibration to the tire axle.

Reproduction potential-based differentiation of Russian regions

2020 ◽  
Vol 18 (7) ◽  
pp. 1304-1319
Author(s):  
M.V. Moroshkina
Keyword(s):  
Spatial Development ◽  
Uneven Development ◽  
Regional Differentiation ◽  
Russian Regions ◽  
Policy Documents ◽  
Factors Influencing ◽  
Strategic Policy ◽  
Main Factors ◽  
Per Capita ◽  
Research Period

Subject. This article examines the issues related to changes in reproduction capacity and heterogeneity of the development of Russian regions. Objectives. The article aims to assess regional differentiation and investigate the main factors influencing the uneven development of the areas. Methods. For the study, we used the methods of comparative and correlation analyses. Results. The article identifies groups of leading and lagging Russian regions and assesses the possibility of convergence of Russian regions according to the analyzed indicators, such as GRP, GRP per capita, and the output of industry. Conclusions. The results obtained can be used when preparing strategic policy documents, spatial development programmes and concepts. The observed heterogeneity suggests that the regions maintain their positions throughout the research period.

Polymer composites as sensing materials for liquid organic solvents – preliminary results

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Stanislaw Frackowiak ◽  
Monika Maciejewska ◽  
Andrzej Szczurek ◽  
Marek Kozlowski
Keyword(s):  
Electrical Resistivity ◽  
Carbon Black ◽  
Polymer Composites ◽  
Percolation Theory ◽  
Liquid Mixtures ◽  
Organic Liquids ◽  
Volumetric Fraction ◽  
Factors Influencing ◽  
Benzene Toluene ◽  
Main Factors

AbstractCarbon black-filled polymer composites were investigated as sensing materials for organic liquids. Polypropylene and polystyrene which were selected as matrices and various amounts of carbon black were considered as the main factors influencing sensitivity of the composites in view of the percolation theory. Disposable filaments were produced of these materials. Change in their electrical resistivity was measured upon immersion in benzene, toluene, xylene, ethylbenzene and their mixtures. It has been found that studied materials were sensitive to the composition of liquid mixtures of organic solvent. Relationships between the filament response and volumetric fraction of the components were presented. The studied materials have shown promising sensing properties, which suggest their applicability for identification and quantification of multicomponent organic liquids.

Factors Influencing Saudi Parents’ Choice of International Schools in Saudi Arabia

2020 ◽  
Vol 19 (3) ◽  
pp. 220-232
Author(s):  
Hamdah Abdullah Alfaraidy
Keyword(s):  
Socioeconomic Status ◽  
International Education ◽  
School Quality ◽  
International Schools ◽  
Traditional Schools ◽  
Ministry Of Education ◽  
Public And Private ◽  
Mandated Curriculum ◽  
Factors Influencing ◽  
Main Factors

The Saudi Ministry of Education has recently begun to allow all Saudi families to enroll their children in international schools. The international curriculum offered by such schools represents a notably different choice compared with Saudi traditional public and private schools, both of which teach the same state-mandated curriculum. As a result of the change, there has been a surge in demand for international education; the number of schools has increased rapidly, and there has been a steady “student leak” towards them and away from traditional schools. Little is known about why Saudi parents choose to enroll their children in international schools. We explored this question by surveying 431 Saudi parents of children attending such schools to identify the main factors contributing to their choice. Although all factors examined were important to parents, curriculum and overall school quality emerged as the most important; socioeconomic status was not influential in their decisions.

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