Partial Electrode Method for Loss and Physical Parameter Determination of Piezoceramics: Simplification, Error Investigation and Applicability

2021 ◽  
Author(s):  
Yoonsang Park ◽  
Hossein Daneshpajooh ◽  
Timo Scholehwar ◽  
Eberhard Hennig ◽  
Kenji Uchino
Keyword(s):  
Physical Parameter ◽  
Parameter Determination ◽  
Electrode Method

Physical Parameter Determination of the δ Scuti Star V1719 Cygni

2002 ◽  
Vol 114 (792) ◽  
pp. 214-223 ◽  
Author(s):  
J. H. Peña ◽  
M. Paparo ◽  
R. Peniche ◽  
M. Rodriguez ◽  
M. A. Hobart ◽  
...  
Keyword(s):  
Physical Parameter ◽  
Parameter Determination ◽  
Scuti Star

scholarly journals Physical Parameter Determination for the δ Scuti Star HD 200925

2000 ◽  
Vol 176 ◽  
pp. 467-468 ◽  
Author(s):  
J. H. Peña ◽  
M. Paparó ◽  
R. Peniche ◽  
M. Rodríguez ◽  
M. A. Hobart ◽  
...  
Keyword(s):  
Physical Parameter ◽  
Time Scale ◽  
Parameter Determination ◽  
Theoretical Ratio ◽  
Blazhko Effect ◽  
Metal Abundance ◽  
Scuti Star

HD 200925 is an unusual star: the period is stable on a time scale of many years, yet it shows variations which are either large and irregular, or small, suggesting a possible Blazhko effect (Poretti 1984; Joner & Johnson 1985); it has larger values of Teff and log g derived from uvbyβ than those of dwarf Cepheids of similar period; and it has a somewhat higher metal abundance, [Fe/H], than the Hyades. Furthermore, in conflict to what Joner and McNamara (1983) determined – that m1 index shows no variation with temperature – HD 200925 shows a definite variation, unlike that predicted in Crawford (1979). No explanation of this has yet been found. Johnson & Joner (1986) also derived an unusual and unexpected value of [Fe/H]. Finally, with respect to the pulsation periods of this star, Mantegazza & Poretti (1986) determined the existence of two periods: one definite, 0.26730 d and a possible second one of 0.2138 d which yield a ratio of P2/P1 = 0.800, the theoretical ratio expected between the first and the second overtones, found in other pulsating variables. All of these facts make HD 200925 an interesting star, motivating the present study.

High Strength Combined Support Technology in Deep High Stress Soft Rock Roadway

2012 ◽  
Vol 524-527 ◽  
pp. 598-603
Author(s):  
Nian Jie Ma ◽  
Zhi Qiang Zhao ◽  
Hua Zhao ◽  
Li Shuai Jiang
Keyword(s):  
High Stress ◽  
Soft Rock ◽  
High Strength ◽  
Parameter Determination ◽  
Test Results ◽  
Actual Measurement ◽  
Computer Numerical Simulation ◽  
Soft Rock Roadway ◽  
Rock Roadway

In order to solve the serious damage and repeat revision problem of high stress soft rock roadway in deep -950 level of Tangshan coal mine, based on the theory of the maximum stress level, together with the actual measurement of geostress and the laboratory mechanical parameters of rock-core and computer numerical simulation, the high strength combined support technology and supporting parameters are determined and the engineering test has been done. The engineering test results show that the parameter determination of high strength combined support technology, which based on the actual measurement of geostress, can effective solve the support issue of high stress soft rock roadway and provide useful experience for similar engineering problems.

A Novel and Fundamental Approach Toward Field and Damper Circuit Parameter Determination of Synchronous Machine

2013 ◽  
Vol 49 (5) ◽  
pp. 2097-2105 ◽  
Author(s):  
Kaushik Mukherjee ◽  
K. Lakshmi Varaha Iyer ◽  
Xiaomin Lu ◽  
Narayan C. Kar
Keyword(s):  
Synchronous Machine ◽  
Parameter Determination ◽  
Circuit Parameter

Problem of angular motion control of a non-cooperative on-orbit service object

2021 ◽  
Vol 2021 (1) ◽  
pp. 37-50
Author(s):  
A.A. Fokov ◽  
◽  
O.P. Savchuk ◽  
Keyword(s):  
Motion Control ◽  
State Of The Art ◽  
Object Motion ◽  
The State ◽  
Angular Motion ◽  
Motion Parameter ◽  
Rotary Motion ◽  
Parameter Determination ◽  
Service Object

The realization of existing projects of on-orbit servicing and the development of new ones is a steady trend in the development of space technology. In many cases, on-orbit service clients are objects that exhibit an undesired rotary motion, which renders their servicing difficult or impossible. The problem of on-orbit service object motion control determines the topicality of studies aimed not only at the refinement of methods and algorithms of controlling both the translational and the rotary motion of an object, but also at the development and refinement of methods of onboard determination of the object – service spacecraft relative motion parameters. This paper overviews the state of the art of the problem of object motion parameter determination in on-orbit servicing tasks and existing methods of object motion control and angular motion damping and specifies lines of further investigations into the angular motion control of non-cooperative service objects. Based on the analysis of publications on the subject, the applicability of onboard means for object motion parameter determination is characterized. The analysis of the applicability of methods of remote determination of the parameters of an unknown non-cooperative object from a service spacecraft shows that they are at the research stage. The input data for the verification of methods proposed in the literature were simulated or taken from ground experiments or previous missions. Contact and contactless methods of angular motion control of non-cooperative on-orbit service objects are considered. From the state of the art of investigations into the contactless motion control of on-orbit service objects it may be concluded that the most advanced contactless method of motion control of an on-orbit service object is a technology based on the use of an ion beam directed to the object from an electrojet engine onboard a service spacecraft. Lines of further investigations into non-cooperative object motion control are proposed.

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