scholarly journals Determination of Blood Vessel Parameters by Pulse Wave

2021 ◽  
pp. 40-44
Author(s):  
Sergey Suchkov ◽  
◽  
Dmitry Suchkov ◽  
Svetlana Suchkova ◽  
◽  
...  
Keyword(s):  
Approximate Solution ◽  
Elastic Modulus ◽  
Pulse Wave ◽  
Wave Transformation ◽  
Physical Parameters ◽  
Joint Motion ◽  
System Of Differential Equations ◽  
Complex Joint ◽  
Mobile Boundary

A pulse wave is a complex joint motion of blood and vessel walls described by a nonlinear system of differential equations of hydrodynamics and elasticity theory with a mobile boundary. Even an approximate solution to such a problem is currently not possible without significant simplifications, reducing the problem to almost uninteresting cases. Therefore, to mathematically describe the practically important changes in the pulse wave between the norm and pathology and to identify the main physical parameters that characterize the pathology, it is necessary to build a phenomenological model, the parameters of which are determined from comparison with the experiment.The results obtained indicate that the pulse wave transformation in the cuff area is significantly nonlinear in pressure. Attention is also drawn to the effect of a decrease in the elastic modulus with an increase in the diameter of the vessel.

Determination of Aortic Elastic Modulus by Pulse Wave Velocity and Wall Tracking in a Rat Model of Aortic Stiffness

2001 ◽  
Vol 38 (6) ◽  
pp. 546-550 ◽  
Author(s):  
Valérie Marque ◽  
Helma van Essen ◽  
Harry A.J. Struijker-Boudier ◽  
Jeffrey Atkinson ◽  
Isabelle Lartaud-Idjouadiene
Keyword(s):  
Elastic Modulus ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Rat Model ◽  
Aortic Stiffness ◽  
Pulse Wave

scholarly journals Charge Transfer Complexes of Ketotifen with 2,3-Dichloro-5,6-dicyano-p-benzoquinone and 7,7,8,8-Tetracyanoquodimethane: Spectroscopic Characterization Studies

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2039
Author(s):  
Gamal A. E. Mostafa ◽  
Ahmed Bakheit ◽  
Najla AlMasoud ◽  
Haitham AlRabiah
Keyword(s):  
Charge Transfer ◽  
Spectroscopic Characterization ◽  
Molar Ratio ◽  
Charge Transfer Complexes ◽  
Physical Parameters ◽  
Spectrophotometric Methods ◽  
Theoretical Approaches ◽  
The Stability ◽  
Ct Complexes

The reactions of ketotifen fumarate (KT) with 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) as π acceptors to form charge transfer (CT) complexes were evaluated in this study. Experimental and theoretical approaches, including density function theory (DFT), were used to obtain the comprehensive, reliable, and accurate structure elucidation of the developed CT complexes. The CT complexes (KT-DDQ and KT-TCNQ) were monitored at 485 and 843 nm, respectively, and the calibration curve ranged from 10 to 100 ppm for KT-DDQ and 2.5 to 40 ppm for KT-TCNQ. The spectrophotometric methods were validated for the determination of KT, and the stability of the CT complexes was assessed by studying the corresponding spectroscopic physical parameters. The molar ratio of KT:DDQ and KT:TCNQ was estimated at 1:1 using Job’s method, which was compatible with the results obtained using the Benesi–Hildebrand equation. Using these complexes, the quantitative determination of KT in its dosage form was successful.

scholarly journals Uncertainty in the determination of elastic modulus by tensile testing

2021 ◽  
Author(s):  
Sonja Kostic ◽  
Jasmina Miljojkovic ◽  
Goran Simunovic ◽  
Djordje Vukelic ◽  
Branko Tadic
Keyword(s):  
Elastic Modulus ◽  
Tensile Testing

scholarly journals New Data on the Eclipsing Binary V1848 Ori and Improved Orbital and Light Curve Solutions

2020 ◽  
Vol 29 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Fatemeh Davoudi ◽  
Atila Poro ◽  
Fahri Alicavus ◽  
Afshin Halavati ◽  
Saeed Doostmohammadi ◽  
...  
Keyword(s):  
Binary System ◽  
Light Curve ◽  
Mass Function ◽  
Light Curves ◽  
Complete Analysis ◽  
Physical Parameters ◽  
Mass Ratio ◽  
Third Body ◽  
Eclipsing Binary

AbstractNew observations of the eclipsing binary system V1848 Ori were carried out using the V filter resulting in a determination of new times of minima and new ephemeris were obtained. We presented the first complete analysis of the system’s orbital period behavior and analysis of O-C diagram done by the GA and MCMC approaches in OCFit code. The O-C diagram demonstrates a sinusoidal trend in the data; this trend suggests a cyclic change caused by the LITE effect with a period of 10.57 years and an amplitude of 7.182 minutes. It appears that there is a third body with mass function of f (m3) = 0.0058 M⊙ in this binary system. The light curves were analyzed using the Wilson-Devinney code to determine some geometrical and physical parameters of the system. These results show that V1848 Ori is a contact W UMa binary system with the mass ratio of q = 0.76 and a weak fillout factor of 5.8%. The O’Connell effect was not seen in the light curve and there is no need to add spot.

Evaluation of Complex Joint Motion With Computer-Based Analysis of Fluoroscopic Sequences

2002 ◽  
Vol 37 (2) ◽  
pp. 73-76 ◽  
Author(s):  
CHRISTIAN W.A. PFIRRMANN ◽  
MARIUS HUSER ◽  
GÁBOR SZÉKELY ◽  
JUERG HODLER ◽  
CHRISTIAN GERBER
Keyword(s):  
Joint Motion ◽  
Computer Based ◽  
Complex Joint
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