Results 21 to 30 of about 877,845 (325)

An advanced hydraulic fracturing technique: Pressure propagation and attenuation mechanism of step rectangular pulse hydraulic fracturing

open access: yesEnergy Science & Engineering, 2023
Hydraulic fracturing technology has played a pivotal role as a key technology in shale gas development, but the geological environmental problems caused have been worrying the public.
Pei He   +6 more
doaj   +1 more source

Relation between respiratory variations in pulse oximetry plethysmographic waveform amplitude and arterial pulse pressure in ventilated patients. [PDF]

open access: yes, 2005
IntroductionRespiratory variation in arterial pulse pressure is a reliable predictor of fluid responsiveness in mechanically ventilated patients with circulatory failure.
Besnard, Cyril   +4 more
core   +2 more sources

Numerical study of the collapse of a bubble subjected to a lithotripter pulse [PDF]

open access: yes, 2006
The collapse of a bubble subjected to a lithotripter pulse is studied numerically. The goal is to record the pressure exerted along the stone, as a measure of potential stone damage. It is found that the pressure due to buble collapse is much larger than
Colonius, Tim, Johnsen, Eric
core   +1 more source

Impaired Central Pulsatile Hemodynamics in Children and Adolescents With Marfan Syndrome

open access: yesJournal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2017
BackgroundMarfan syndrome is characterized by aortic root dilation, beginning in childhood. Data about aortic pulsatile hemodynamics and stiffness in pediatric age are currently lacking.
Andrea Grillo   +9 more
doaj   +1 more source

Xenon excimer emission from pulsed high-pressure capillary microdischarges [PDF]

open access: yes, 2007
Intense xenon vacuum ultraviolet (VUV) emission is observed from a high-pressure capillary cathode microdischarge in direct current operation, by superimposing a high-voltage pulse of 50 ns duration.
Frank, Klaus   +4 more
core   +1 more source

Development of tubular cardiovascular phantom system for pulse transit time simulation [PDF]

open access: yes, 2019
This paper presents on the development of a tubular cardiovascular phantom system to simulate pulse transit time (PTT). The PTT defined as the delay time between two pulses in one cardiac cycle has been shown to be promising method for cuffless ...
Correia, Ricardo   +4 more
core   +1 more source

High pulse pressure impairs cerebral artery endothelial function in young, but not old, mice

open access: yesExperimental Gerontology, 2023
One of the hallmarks of vascular aging is increased pulse pressure. This elevated pulse pressure is associated with deleterious effects on cerebral vascular function; however, it is unknown if age modulates the susceptibility to high pulse pressure.
Nick R. Winder   +7 more
doaj  

Scattering of a Plane Acoustical Wave by a Spherical Obstacle [PDF]

open access: yes, 1965
The long-time behavior of the scattered field produced by a plane acoustical pulse stalking a spherical obstacle is investigated. Incident pulses are taken that represent a unit step in potential (or equivalently delta function pulse in pressure), an ...
Cohen, Donald S., Handelman, George H.
core   +1 more source

Association of Pulse Pressure Difference and Diabetes Mellitus in Chinese People: A Cohort Study

open access: yesInternational Journal of General Medicine, 2021
Chunlei Wu, Denhua Ma, Yu Chen Department of Cardiac Surgery, Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical University, Linhai, 317000, People’s Republic of ChinaCorrespondence: Yu Chen People’s Republic of ChinaEmail chenyu5835@126.
Wu C, Ma D, Chen Y
doaj  

Formation Principle and Characteristics of Self-Supercharging Pulsed Water Jet

open access: yesChinese Journal of Mechanical Engineering, 2022
High-pressure pulsed water jet technology has considerable development potential in the field of rock fragmentation. To overcome the shortcomings of existing pulsed jets, a self-supercharging pulsed water jet (SSPWJ) generation method is proposed, which ...
Zhaolong Ge   +6 more
doaj   +1 more source

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