scholarly journals Laser-induced pressure-wave and barocaloric effect during flash diffusivity measurements

2017 ◽  
Vol 111 (5) ◽  
pp. 051901 ◽  
Author(s):  
H. Wang ◽  
W. D. Porter ◽  
R. B. Dinwiddie
Keyword(s):  
Pressure Wave ◽  
Diffusivity Measurements ◽  
Flash Diffusivity

Note: A method for correction of finite pulse time effects in flash diffusivity measurements of thin films

2016 ◽  
Vol 87 (8) ◽  
pp. 086104 ◽  
Author(s):  
Ye Tao ◽  
Liping Yang ◽  
Qiu Zhong ◽  
Zijun Xu ◽  
Caiyun Luo
Keyword(s):  
Thin Films ◽  
Pulse Time ◽  
Time Effects ◽  
Diffusivity Measurements ◽  
Flash Diffusivity

Numerical and experimental investigation on internal membrane pressure wave inside sealed structure

2013 ◽  
Vol 61 (3) ◽  
pp. 613-621 ◽  
Author(s):  
W. Barnat
Keyword(s):  
Experimental Investigation ◽  
Pressure Wave ◽  
Pressure Increase ◽  
Internal Organs ◽  
Pressure Impulse ◽  
Internal Membrane ◽  
Contaminated Area

Abstract The article presents an approach to modeling the internal membrane pressure wave inside a sealed structure. During an explosion near a vehicle when a pressure wave reaches a hull, a pressure wave inside arises due to the hull’s bottom and the deformation of sides. They act like the piston - membrane. This membrane transfers the pressure impulse into the vehicle’s interior. A pressure increase causes the damage of internal organs or even death of occupants. In case of an armor penetration the pressure increase may be even larger. One of basic methods to protect a crew is to open hatches. However, such a method cannot be used in a contaminated area.

Iterative learning control of air pressure variation inside a high-speed train under the excitation of the tunnel pressure wave with a fixed-morphologic form

2021 ◽  
pp. 095440972110327
Author(s):  
Zhiying He ◽  
Chunjun Chen ◽  
Dongwei Wang ◽  
Chao Deng ◽  
Jia Hu ◽  
...  
Keyword(s):  
Iterative Learning Control ◽  
Pressure Wave ◽  
High Speed ◽  
Learning Control ◽  
Pressure Variation ◽  
Iterative Learning ◽  
Air Pressure ◽  
High Speed Train ◽  
Comfort Index ◽  
Simulation Signal

Based on the characteristics that the tunnel pressure wave has a fixed-morphologic form when the same train passes through the same tunnel, an applicational approach based on the iterative learning control (ILC) is developed, aiming at overcoming the drawbacks of the traditional strategy for controlling the air pressure variation inside a high-speed train carriage. To achieve the goal, the control system is mathematically modelled. Then, the problem is formulated. The task of suppressing the influence of the tunnel pressure wave on the air pressure inside the carriages is shifted as an ILC problem of tracking the comfort index with varying trial length. The algorithm of refreshing the control signal from trial to trial is determined and the process of ILC control is designed. Next, the convergence of the newly-developed applicational ILC algorithm is discussed and the algorithm is simulated by the simulation signal and field-test signal. Results show that the applicational ILC algorithm be more adaptable in handling the control of the air pressure inside carriage under the excitation of varying-amplitude, varying-scale and varying-initial-states tunnel pressure wave. Meanwhile, the matching with tunnel pressure wave makes the applicational ILC algorithm will take both the riding comfort and fresh air into consideration, which upgrades the performances when the high-speed train passing through long tunnels.

Moderately increased alcohol consumption is associated with higher pressure wave reflections and blood pressure in men

2020 ◽  
Author(s):  
Eirini D. Basdeki ◽  
Christiana Tsirimiagkou ◽  
Antonios Argyris ◽  
George Moschonis ◽  
Petros Sfikakis ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Alcohol Consumption ◽  
Pressure Wave ◽  
Wave Reflections
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