scholarly journals Comprehensive analysis of Barkhausen emission spectra using pulse height analysis, frequency spectrum, and pulse wave form analysis

1993 ◽  
Vol 73 (10) ◽  
pp. 5623-5625 ◽  
Author(s):  
L. B. Sipahi ◽  
D. C. Jiles ◽  
D. Chandler
Keyword(s):  
Frequency Spectrum ◽  
Pulse Wave ◽  
Pulse Height ◽  
Emission Spectra ◽  
Comprehensive Analysis ◽  
Wave Form ◽  
Form Analysis ◽  
Pulse Height Analysis

Cerebrospinal Fluid Pulse Wave Form Analysis during Hypercapnia and Hypoxia

Neurosurgery ◽  
1981 ◽  
Vol 9 (1) ◽  
pp. 14-27 ◽  
Author(s):  
Harold D. Portnoy ◽  
Michael Chopp
Keyword(s):  
Cerebrospinal Fluid ◽  
Pulse Wave ◽  
Wave Form ◽  
Form Analysis

scholarly journals Hemodynamic Effects of Ephedrine, Phenylephrine, and the Coadministration of Phenylephrine with Oxytocin during Spinal Anesthesia for Elective Cesarean Delivery

2009 ◽  
Vol 111 (4) ◽  
pp. 753-765 ◽  
Author(s):  
Robert A. Dyer ◽  
Anthony R. Reed ◽  
Dominique van Dyk ◽  
Michelle J. Arcache ◽  
Owen Hodges ◽  
...  
Keyword(s):  
Heart Rate ◽  
Spinal Anesthesia ◽  
Cesarean Delivery ◽  
Pulse Wave ◽  
Wave Form ◽  
Elective Cesarean Delivery ◽  
Hemodynamic Responses ◽  
Form Analysis ◽  
Elective Cesarean ◽  
To Receive

Background Hemodynamic responses to vasopressors used during spinal anesthesia for elective Cesarean delivery, have not been well described. This study compared the effects of bolus phenylephrine and ephedrine on maternal cardiac output (CO). The hypothesis was that phenylephrine, but not ephedrine, decreases CO when administered in response to hypotension during spinal anesthesia. Methods Forty-three patients were randomized to receive 80 microg of phenylephrine or 10 mg of ephedrine. Both pulse wave form analysis and transthoracic bioimpedance changes were used to estimate stroke volume in each patient. Hemodynamic responses to spinal anesthesia and oxytocin were also recorded. A subgroup of 20 patients was randomized to receive oxytocin compared with oxytocin plus 80 microg of phenylephrine after delivery. Results Mean CO and maximum absolute response in CO were significantly lower during the 150 s after phenylephrine administration than after ephedrine (6.2 vs. 8.1 l/min, P = 0.001, and 5.2 vs. 9.0 l/min, P < 0.0001, respectively for pulse wave form analysis, and 5.2 vs. 6.3 l/min, P = 0.01 and 4.5 vs. 6.7 l/min, P = 0.0001, respectively for bioimpedance changes). CO changes correlated with heart rate changes. Coadministration of phenylephrine obtunded oxytocin-induced decreases in systemic vascular resistance and increases in heart rate and CO. Trends in CO change were similar using either monitor. Conclusions Bolus phenylephrine reduced maternal CO, and decreased CO when compared with ephedrine during elective spinal anesthesia for Cesarean delivery. CO changes correlated with heart rate changes after vasopressor administration, emphasizing the importance of heart rate as a surrogate indicator of CO. Coadministered phenylephrine obtunded hemodynamic responses to oxytocin.

Multiparameter pulse-height analysis with a PDP-8/e computer

1974 ◽  
Vol 121 (3) ◽  
pp. 573-580 ◽  
Author(s):  
N.S. Kendrick ◽  
D.A. McClure
Keyword(s):  
Pulse Height ◽  
Pulse Height Analysis

Some numerical solutions for Lamb's problem

1974 ◽  
Vol 64 (2) ◽  
pp. 473-491
Author(s):  
Harold M. Mooney
Keyword(s):  
Rayleigh Wave ◽  
Poisson’S Ratio ◽  
Pulse Width ◽  
Numerical Solutions ◽  
Pulse Height ◽  
P Wave ◽  
Poisson's Ratio ◽  
Wave Form ◽  
Lamb’S Problem ◽  
Wave Forms

abstract We consider a version of Lamb's Problem in which a vertical time-dependent point force acts on the surface of a uniform half-space. The resulting surface disturbance is computed as vertical and horizontal components of displacement, particle velocity, acceleration, and strain. The goal is to provide numerical solutions appropriate to a comparison with observed wave forms produced by impacts onto granite and onto soil. Solutions for step- and delta-function sources are not physically realistic but represent limiting cases. They show a clear P arrival (larger on horizontal than vertical components) and an obscure S arrival. The Rayleigh pulse includes a singularity at the theoretical arrival time. All of the energy buildup appears on the vertical components and all of the energy decay, on the horizontal components. The effects of Poisson's ratio upon vertical displacements for a step-function source are shown. For fixed shear velocity, an increase of Poisson's ratio produces a P pulse which is larger, faster, and more gradually emergent, an S pulse with more clear-cut beginning, and a much narrower Rayleigh pulse. For a source-time function given by cos2(πt/T), −T/2 ≦ T/2, a × 10 reduction in pulse width at fixed pulse height yields an increase in P and Rayleigh-wave amplitudes by factors of 1, 10, and 100 for displacement, velocity and strain, and acceleration, respectively. The observed wave forms appear somewhat oscillatory, with widths proportional to the source pulse width. The Rayleigh pulse appears as emergent positive on vertical components and as sharp negative on horizontal components. We show a theoretical seismic profile for granite, with source pulse width of 10 µsec and detectors at 10, 20, 30, 40, and 50 cm. Pulse amplitude decays as r−1 for P wave and r−12 for Rayleigh wave. Pulse width broadens slightly with distance but the wave form character remains essentially unchanged.

A new soft x-ray pulse height analysis array in the HL-2A tokamak

2009 ◽  
Vol 80 (12) ◽  
pp. 126104 ◽  
Author(s):  
Y. P. Zhang ◽  
Yi Liu ◽  
J. W. Yang ◽  
X. Y. Song ◽  
M. Liao ◽  
...  
Keyword(s):  
Pulse Height ◽  
X Ray ◽  
Pulse Height Analysis

scholarly journals Plasma impurities observed by a pulse height analysis diagnostic during the divertor campaign of the Wendelstein 7-X stellarator

2018 ◽  
Vol 89 (10) ◽  
pp. 10F111 ◽  
Author(s):  
M. Kubkowska ◽  
A. Czarnecka ◽  
T. Fornal ◽  
M. Gruca ◽  
S. Jabłoński ◽  
...  
Keyword(s):  
Pulse Height ◽  
Pulse Height Analysis ◽  
Plasma Impurities
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