A quadrature digital synthesizer/mixer architecture using fine/coarse coordinate rotation to achieve 14-b input, 15-b output, and 100-dBc SFDR

2004 ◽  
Vol 39 (11) ◽  
pp. 1853-1861 ◽  
Author(s):  
Yongchul Song ◽  
Beomsup Kim
Keyword(s):  
Coordinate Rotation

Three‐component sonde orientation in a deviated well

Geophysics ◽  
1990 ◽  
Vol 55 (10) ◽  
pp. 1386-1388 ◽  
Author(s):  
M. Becquey ◽  
M. Dubesset
Keyword(s):  
Hydraulic Fracturing ◽  
Coordinate System ◽  
Vertical Plane ◽  
Vertical Axis ◽  
Horizontal Axis ◽  
Orthogonal Coordinate System ◽  
Coordinate Rotation ◽  
Orthogonal Components ◽  
Particle Velocities

In well seismics, when operating with a three‐component tool, particle velocities are measured in the sonde coordinate system but are often needed in other systems (e.g., source‐bound or geographic). When the well is vertical, a change from the three orthogonal components of the sonde to another orthogonal coordinate system can be performed through one rotation around the vertical axis and, if necessary, another one around a horizontal axis (Hardage, 1983). If the well is deviated, the change of coordinate system remains easy in the case when the source is located at the vertical of the sonde, or in the case when the source stands in the vertical plane defined by the local well axis. In the general case (offset VSPs or walkaways) or when looking for unknown sources (such as microseismic emissions induced by hydraulic fracturing), coordinate rotation may still be performed, provided that we first get back to a situation in which one of the axes is vertical.

Coordinate Rotation–Amplification in the Uncertainty and Bias in Non-orthogonal Sonic Anemometer Vertical Wind Speeds

2020 ◽  
Vol 175 (2) ◽  
pp. 203-235 ◽  
Author(s):  
John M. Frank ◽  
William J. Massman ◽  
W. Stephen Chan ◽  
Keith Nowicki ◽  
Scot C. R. Rafkin
Keyword(s):  
Sonic Anemometer ◽  
Vertical Wind ◽  
Wind Speeds ◽  
Coordinate Rotation

scholarly journals Calculations of Resonance Parameters for the Doubly Excited 1P° States in Ps− Using Exponentially Correlated Wave Functions

Atoms ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 1 ◽  
Author(s):  
Sabyasachi Kar ◽  
Yew Kam Ho
Keyword(s):  
Feshbach Resonance ◽  
Wave Functions ◽  
Negative Ion ◽  
Shape Resonance ◽  
Resonance States ◽  
Resonance Parameters ◽  
Rotation Method ◽  
Resonance Energies ◽  
Doubly Excited ◽  
Coordinate Rotation

Recent observations on resonance states of the positronium negative ion (Ps−) in the laboratory created huge interest in terms of the calculation of the resonance parameters of the simple three-lepton system. We calculate the resonance parameters for the doubly excited 1P° states in Ps− using correlated exponential wave functions based on the complex-coordinate rotation method. The resonance energies and widths for the 1P° Feshbach resonance states in Ps− below the N = 2, 3, 4, 5 Ps thresholds are reported. The 1P° shape resonance above the N = 2, 4 Ps thresholds are also reported. Our predications are in agreement with the available results. Few Feshbach resonance parameters below the N = 4 and 5 Ps thresholds have been reported in the literature. Our predictions will provide useful information for future resonance experiments in Ps−.

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