Floor-response spectral analysis and fitting of the museum building before and after isolation

2021 ◽  
pp. 1-45
Author(s):  
Ya Wang ◽  
Weiguo Yang
Keyword(s):  
Spectral Analysis ◽  
Before And After ◽  
Response Spectral Analysis

Abstract 4104: Organization of Atrial Signals is Critical Prior to Cardioversion of Atrial Fibrillation with Intravenous Flecainide: Insight from Spectral Analysis of Intracardiac Electrograms

Circulation ◽  
2008 ◽  
Vol 118 (suppl_18) ◽  
Author(s):  
Jiun Tuan ◽  
Suman Kundu ◽  
Mohamed Jeilan ◽  
Faizel Osman ◽  
Rajkumar Mantravadi ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Spectral Analysis ◽  
Catheter Ablation ◽  
Cycle Length ◽  
Dominant Frequency ◽  
Relative Increase ◽  
Significant Difference ◽  
Before And After ◽  
Atrial Activation ◽  
Relative Change

Introduction & Hypothesis: Studies in catheter ablation of atrial fibrillation (AF) show that an increase in cycle length (CL) and higher organization index (OI) is associated with termination of AF. We hypothesize that similar changes can be seen in chemical cardioversion with Flecainide Methods: Patients who were still in AF at the end of catheter ablation for AF were given intravenous flecainide. OI and dominant frequency (DF) were obtained by Fast Fourier Transform of coronary sinus electrograms over 10s in AF, before and after flecainide infusion. Mean CL was also calculated. Results: 28 patients were identified (18 paroxysmal AF and 10 persistent AF). 8 cardioverted to sinus rhythm (SR) with flecainide. In all patients, mean CL increased from 211 ± 44 ms to 321 ± 85 ms (p <0.001). Mean DF decreased from 5.2 ± 1.03 Hz to 3.6 ± 1.04 Hz (p <0.001). Mean OI was 0.33 ± 0.13 before and 0.32 ± 0.11 after flecainide (p = 0.90). Comparing patients who cardioverted to SR with those who did not, OI post-flecainide was 0.41 ± 0.12 vs 0.29 ± 0.10 (p=0.013) and relative change in OI was 29 ± 33% vs −3.9 ± 27% (p=0.016) respectively. No significant difference was noted in the change in CL and DF in the 2 groups. Logistic regression showed that a greater relative increase in OI (p=0.04), a higher OI post-flecainide (p=0.03) and SR at start of procedure (p=0.03) are independently associated with cardioversion to SR with flecainide. Conclusion: Increase in OI, independent of changes to the CL and DF, appears critical to AF termination with flecainide. The increase in OI may reflect an increase in size and reduction in the number of re-entrant circuits, which together with slowing of atrial activation, result in return to SR.

Assessment of Autonomic Response before and after Total Spinal Anesthesia in Rats: Power Spectral Analysis

2005 ◽  
Vol 48 (2) ◽  
pp. 182
Author(s):  
Gyu Sam Hwang ◽  
In Young Huh ◽  
Su Jin Kang ◽  
Mi Ok Youn ◽  
Won Jung Shin ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Spinal Anesthesia ◽  
Power Spectral Analysis ◽  
Autonomic Response ◽  
Total Spinal Anesthesia ◽  
Power Spectral ◽  
Before And After

scholarly journals Active Emergence from Propofol General Anesthesia Is Induced by Methylphenidate

2012 ◽  
Vol 116 (5) ◽  
pp. 998-1005 ◽  
Author(s):  
Jessica J. Chemali ◽  
Christa J. Van Dort ◽  
Emery N. Brown ◽  
Ken Solt
Keyword(s):  
Spectral Analysis ◽  
Single Dose ◽  
General Anesthesia ◽  
Median Time ◽  
Molecular Mechanisms ◽  
General Anesthetics ◽  
Adult Rats ◽  
Before And After ◽  
Target Plasma Concentration ◽  
The Difference

Background A recent study showed that methylphenidate induces emergence from isoflurane general anesthesia. Isoflurane and propofol are general anesthetics that may have distinct molecular mechanisms of action. The objective of this study was to test the hypothesis that methylphenidate actively induces emergence from propofol general anesthesia. Methods Using adult rats, the effect of methylphenidate on time to emergence after a single bolus of propofol was determined. The ability of methylphenidate to restore righting during a continuous target-controlled infusion (TCI) of propofol was also tested. In a separate group of rats, a TCI of propofol was established and spectral analysis was performed on electroencephalogram recordings taken before and after methylphenidate administration. Results Methylphenidate decreased median time to emergence after a single dose of propofol from 735 s (95% CI: 598-897 s, n = 6) to 448 s (95% CI: 371-495 s, n = 6). The difference was statistically significant (P = 0.0051). During continuous propofol anesthesia with a median final target plasma concentration of 4.0 μg/ml (95% CI: 3.2-4.6, n = 6), none of the rats exhibited purposeful movements after injection of normal saline. After methylphenidate, however, all six rats promptly exhibited arousal and had restoration of righting with a median time of 82 s (95% CI: 30-166 s). Spectral analysis of electroencephalogram data demonstrated a shift in peak power from δ (less than 4 Hz) to θ (4-8 Hz) and β (12-30 Hz) after administration of methylphenidate, indicating arousal in 4/4 rats. Conclusions Methylphenidate decreases time to emergence after a single dose of propofol, and induces emergence during continuous propofol anesthesia in rats. Further study is warranted to test the hypothesis that methylphenidate induces emergence from propofol general anesthesia in humans.

Spectral Analysis of the Laser Doppler Perfusion Signal in Human Skin before and after Exercise

1998 ◽  
Vol 56 (3) ◽  
pp. 173-182 ◽  
Author(s):  
Hebe Désirée Kvernmo ◽  
Aneta Stefanovska ◽  
Maja Bracic ◽  
Knut Arvid Kirkebøen ◽  
Knut Kvernebo
Keyword(s):  
Spectral Analysis ◽  
Human Skin ◽  
Laser Doppler ◽  
Before And After

Correction of Loss on Ignition in Slag Powder by ICP-AES

2017 ◽  
Vol 726 ◽  
pp. 60-64
Author(s):  
Man Li ◽  
Qian Nan Li ◽  
Ming Yu Wang ◽  
Dan Hua Xu ◽  
Qing Dan Yuan
Keyword(s):  
Spectral Analysis ◽  
Standard Deviation ◽  
Detection Limit ◽  
Traditional Method ◽  
National Standard ◽  
Loss On Ignition ◽  
Pretreatment Method ◽  
Slag Powder ◽  
Relative Standard ◽  
Before And After

In this work, with reference to the pretreatment method of the relevant national standard, we tested the content of SO3 in slag powder before and after burning by ICP-AES, then the result of burning loss was corrected by the content of SO3. The content of SO3 which was determined by this new method is fast and accurate, compared with the traditional method. We selected the wavelength of 182.0nm as spectral analysis of SO3. The detection limit of the method (3S) was 0.016 mg/L, the recovery rate of the sample was between 97%-104%, and the relative standard deviation (n=6) of the parallel samples was less than 1.05%.

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