Computational Optimization of Pressure Wave Reflection on the Piston Surface for Single Point Autoignition Gasoline Engine with Colliding Pulsed Supermulti-Jets Leading to Noiseless-High Compression and Nearly-Complete Air-Insulation

2019 ◽  
Author(s):  
Aya Hosoi ◽  
Remi Konagaya ◽  
Sota Kawaguchi ◽  
Yasuhiro Sogabe ◽  
Yuya Yamashita ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Wave Reflection ◽  
Gasoline Engine ◽  
Single Point ◽  
Computational Optimization ◽  
High Compression

scholarly journals Pressure Wave Reflection Assessed From the Peripheral Pulse

Hypertension ◽  
2003 ◽  
Vol 41 (5) ◽  
pp. 1016-1020 ◽  
Author(s):  
Sandrine C. Millasseau ◽  
Sundip J. Patel ◽  
Simon R. Redwood ◽  
James M. Ritter ◽  
Philip J. Chowienczyk
Keyword(s):  
Pressure Wave ◽  
Wave Reflection ◽  
Peripheral Pulse

Abstract P057: Arterial Stiffness And Pressure Wave Reflection In The Development Of Isolated Diastolic Hypertension

Hypertension ◽  
2020 ◽  
Vol 76 (Suppl_1) ◽  
Author(s):  
Hirofumi Tomiyama ◽  
Kazuki N Shiina ◽  
Taishiro Chikamori ◽  
Akira Yamashina
Keyword(s):  
Blood Pressure ◽  
Arterial Stiffness ◽  
Pressure Wave ◽  
Wave Reflection ◽  
Augmentation Index ◽  
Care Center ◽  
Estimating Equation ◽  
Health Care Center ◽  
Diastolic Hypertension ◽  
New Onset

Importance: While increased arterial stiffness and augmented pressure wave reflection are thought to be key factors in the development of systolic/diastolic hypertension (SDHT) or isolated systolic hypertension (ISHT) via the elevation of systolic blood pressure, their associations with the development of isolated diastolic hypertension (IDHT) have not been clarified. Objective: To examine the significance of augmented pressure wave reflection in the absence of accompanying increase of the arterial stiffness in the development of IDHT. Design and Setting: The prospective observational study conducted in the employees of a Japanese construction company at its health care center from year 2007 through year 2015 with a mean follow-up of 6.4 years, respectively. Participants: A total of 3022 Japanese male employees without hypertension at the start of this study. Main Outcomes and Measures: The annual assessment of prevalence of any phenotypes of hypertension. The blood pressure, brachial-ankle pulse wave velocity (baPWV), and radial augmentation index (rAI) were measured annually during the study period. Results: At the end of the study period, 129 subjects were diagnosed as having SDHT, 112 as having ISHT, and 74 as having IDHT. Both the baPWV and rAI showed significant individual odds ratios for new onset of SDHT and new onset of ISHT. However, only rAI, but not the brachial-ankle PWV, showed a significant odds ratio (1.44, P<0.01) for new onset of IDHT. This association was significant in subjects without elevated baPWV values at the start of the study (i.e., baPWV < 1224 cm/sec), but not in those with elevated brachial-ankle PWV at the start of the study. Generalized estimating equation analyses demonstrated a significant longitudinal association of the rAI, but not baPWV, with the prevalence of IDHT (estimate = 0.02, P=0.02). Conclusions: While increased arterial stiffness and augmented pressure wave reflection present concomitantly may be associated with the development of SDHT and ISHT, augmented pressure wave reflection alone, which may be related to isolated peripheral vascular damage, in the absence of accompanying increase of the arterial stiffness, may be a significant factor in the development of IDHT.

[PP.20.05] THE HEMODYNAMIC CHANGE BY SQUATTING IS INDUCED BY DIMINISHED VASCULAR DISTENSIBILITY AND ENHANCED PRESSURE WAVE REFLECTION

2016 ◽  
Vol 34 ◽  
pp. e240
Author(s):  
T. Nawa ◽  
T. Murakami ◽  
M. Shiraishi ◽  
S. Fukuoka ◽  
K. Higashi ◽  
...  
Keyword(s):  
Pressure Wave ◽  
Wave Reflection ◽  
Hemodynamic Change

Lean Combustion in a High Compression Four Stroke Gasoline Engine

1981 ◽  
Author(s):  
K. S. Herbsleb ◽  
L. Lorenzen ◽  
E. Kofoed
Keyword(s):  
Gasoline Engine ◽  
Lean Combustion ◽  
High Compression

Progressive Resistance Training Without Volume Increases Does Not Alter Arterial Stiffness and Aortic Wave Reflection

2007 ◽  
Vol 232 (9) ◽  
pp. 1228-1235 ◽  
Author(s):  
Darren P. Casey ◽  
Darren T. Beck ◽  
Randy W. Braith
Keyword(s):  
Resistance Training ◽  
Arterial Stiffness ◽  
Pressure Wave ◽  
Wave Reflection ◽  
Augmentation Index ◽  
Aortic Pressure ◽  
Control Group ◽  
Training Volume ◽  
Leg Extension ◽  
Peripheral Arterial

Endurance exercise is efficacious in reducing arterial stiffness. However, the effect of resistance training (RT) on arterial stiffening is controversial. High-intensity, high-volume RT has been shown to increase arterial stiffness in young adults. We tested the hypothesis that an RT protocol consisting of progressively higher intensity without concurrent increases in training volume would not elicit increases in either central or peripheral arterial stiffness or alter aortic pressure wave reflection in young men and women. The RT group ( n = 24; 21 ± 1 years) performed two sets of 8–12 repetitions to volitional fatigue on seven exercise machines on 3 days/week for 12 weeks, whereas the control group ( n = 18; 22 ± 1 years) did not perform RT. Central and peripheral arterial pulse wave velocity (PWV), aortic pressure wave reflection (augmentation index; AIx), brachial flow–mediated dilation (FMD), and plasma levels of nitrate/nitrite (NOx) and norepinephrine (NE) were measured before and after RT. RT increased the one-repetition maximum for the chest press and the leg extension ( P < 0.001). RT also increased lean body mass ( P < 0.01) and reduced body fat (%; P < 0.01). However, RT did not affect carotid-radial, carotid-femoral, and femoral-distal PWV (8.4 ± 0.2 vs. 8.0 ± 0.2 m/sec; 6.5 ± 0.1 vs. 6.3 ± 0.2 m/sec; 9.5 ± 0.3 vs. 9.5 ± 0.3 m/sec, respectively) or AIx (2.5% ± 2.3% vs. 4.8% ± 1.8 %, respectively). Additionally, no changes were observed in brachial FMD, NOx, NE, or blood pressures. These results suggest that an RT protocol consisting of progressively higher intensity without concurrent increases in training volume does not increase central or peripheral arterial stiffness or alter aortic pressure wave characteristics in young subjects.

4.3 ABNORMAL PRESSURE WAVE REFLECTION ACCELERATES THE DEVELOPMENT OF HYPERTENSION VIA THE INCREASE OF ARTERIAL STIFFNESS

2017 ◽  
Vol 20 (C) ◽  
pp. 56
Author(s):  
Hirofumi Tomiyama ◽  
Akira Yamashina ◽  
Shunsuke Komatsu ◽  
Kazuki Shiina ◽  
Chisa Matsumoto ◽  
...  
Keyword(s):  
Arterial Stiffness ◽  
Pressure Wave ◽  
Wave Reflection ◽  
Abnormal Pressure

PARAMETERS OF PRESSURE WAVE REFLECTION ARE ASSOCIATED WITH ANKLE- BRACHIAL INDEX IN THE GENERAL POPULATION

2011 ◽  
Vol 29 ◽  
pp. e481-e482
Author(s):  
J. Seidlerová ◽  
J. Filipovský ◽  
R. Cífková ◽  
P. Wohlfahrt ◽  
A. Krajčoviechová
Keyword(s):  
General Population ◽  
Pressure Wave ◽  
Wave Reflection ◽  
Ankle Brachial Index

Does pressure wave reflection contribute to aortic root dilatation in patients with Marfan disease?

2006 ◽  
Vol 39 ◽  
pp. S285
Author(s):  
P. Segers ◽  
J. De Backer ◽  
D. Devos ◽  
T. Gillebert ◽  
L. Van Bortel ◽  
...  
Keyword(s):  
Aortic Root ◽  
Pressure Wave ◽  
Wave Reflection ◽  
Aortic Root Dilatation
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