scholarly journals Manifestation of nematic degrees of freedom in the Raman response function of iron pnictides

2015 ◽  
Vol 92 (7) ◽  
Author(s):  
U. Karahasanovic ◽  
F. Kretzschmar ◽  
T. Böhm ◽  
R. Hackl ◽  
I. Paul ◽  
...  
Keyword(s):  
Response Function ◽  
Degrees Of Freedom ◽  
Iron Pnictides ◽  
Raman Response

Seismic calibration using the simplex algorithm

1989 ◽  
Vol 79 (5) ◽  
pp. 1618-1628
Author(s):  
Lee Steck ◽  
William A. Prothero
Keyword(s):  
Response Function ◽  
Degrees Of Freedom ◽  
Simplex Algorithm ◽  
Complex Polynomial ◽  
High Signal ◽  
Polynomial Representation ◽  
Important Improvement ◽  
The Time Domain ◽  
Calibration Program ◽  
Starting Model

Abstract We have modified the software of Sauter and Dorman (1986) to produce a robust and flexible calibration program that works in the frequency domain for longer and noisy calibration signals, as well as in the time domain when shorter, high signal-to-noise calibration signals may be used. The most important improvement was to replace the least squares fitting of the complex polynomial representation of the response function with the simplex fitting of the pole-zero representation of the response function. The simplex algorithm always converges to a minimum, regardless of starting model, and by fitting the poles and zeroes directly, we minimize the degrees of freedom of the solution. Typical VAX 11/750 CPU requirements are on the order of 2 to 3 minutes for both codes, with average errors less than 1 per cent in amplitude and 1° in phase.

Estimation of Frequency Response Function on Rotational Degrees of Freedom of Structures

1999 ◽  
Author(s):  
Naoki Hosoya ◽  
Takuya Yoshimura
Keyword(s):  
Frequency Response ◽  
Response Function ◽  
Structural Dynamics ◽  
Frequency Response Function ◽  
Degrees Of Freedom ◽  
Estimation Procedure ◽  
Rigid Block ◽  
Measurement Point ◽  
Beam Structure ◽  
Rotational Degrees Of Freedom

Abstract In conventional vibration testing, measurement of frequency response function (FRF) has been limited to translational degrees of freedom (DOF). Rotational DOFs have not been treated in experimental analysis. However, the rotational DOF is indispensable in further analysis, such as substructure synthesis, prediction of structural dynamics modification, etc. Hence, measurement of FRFs on rotational DOF is essential for expanding applicability of experimental modal analysis. This paper proposes a new method for FRF estimation on rotational DOF of structures. The following is the estimation procedure: A rigid block is fixed on the measurement point of the structure; the block is excited by conventional impact hammer; the inner force and the response of the connection point including rotational DOFs are estimated; and lastly, the FRF including rotational DOF at the connection point of the structure is obtained. The feasibility of the method is investigated experimentally by applying it to a beam structure.

Δ Isobar Degrees of Freedom in the 3He Transverse Electron Scattering Response Function

2013 ◽  
Vol 54 (7-10) ◽  
pp. 1429-1432
Author(s):  
Winfried Leidemann ◽  
Luping Yuan ◽  
Victor D. Efros ◽  
Giuseppina Orlandini ◽  
Edward L. Tomusiak
Keyword(s):  
Response Function ◽  
Electron Scattering ◽  
Degrees Of Freedom ◽  
Scattering Response ◽  
Transverse Electron
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