Results 21 to 30 of about 3,472,844 (301)
Mechanical Engineering Journal, 2023 Micro-pressure wave emission from tunnel portals in high-speed railways causes environmental issues. Tunnel hoods installed in the tunnel portals reduce the micro-pressure wave emission by reducing the pressure gradient of the compression wavefront ...
Takashi FUKUDA, Sanetoshi SAITO
doaj +1 more source
An Analytical Model for Wind Turbine Wakes under Pressure Gradient
Energies, 2022 In this study, we present an analytical modeling framework for wind turbine wakes under an arbitrary pressure gradient imposed by the base flow. The model is based on the conservation of the streamwise momentum and self-similarity of the wake velocity ...
Arslan Salim Dar, Fernando Porté-Agel
doaj +1 more source
Diagnostics, 2018 Invasive catheterization is associated with a low risk of serious complications. However, although it is the gold standard for measuring pressure gradients, it induces changes to blood flow and requires significant resources.
Tin-Quoc Nguyen +5 more
doaj +1 more source
Contribution to boundary-layer flow analysis using the Pohlhausen method
Vojnotehnički Glasnik, 1996 The Pohlhausen’s method is applied to velocity profile calculation for a laminar boundary layer of a body in a streem with external velocity gradient. It is necessary to calculate boundary layer thickness, tangential stress and other parameters for 50 ...
Dušan Regodić
doaj +1 more source
Acta Acustica, 2022 This study offers a semi-analytical means to compute the wall pressure spectra beneath a turbulent boundary layer depending only on the latter’s Kármán number and dimensionless pressure gradient.
Prigent Simon L., Bailly Christophe
doaj +1 more source
Advances of Surface Wind Speed Changes over China Under Global Warming
应用气象学报, 2020 Previous studies indicate that surface wind speed (SWS) over China is declining continuously during past decades under global warming, and this has significant impact on wind energy resources.
Ding Yihui, Li Xiao, Li Qiaoping
doaj +1 more source
Frontiers in Cardiovascular Medicine, 2023 BackgroundSutureless and rapid-deployment valves are bioprostheses anchoring within the aortic annulus with few sutures, and they act as a hybrid of conventional surgical and transcatheter valves under aortic valve replacement.
Chenhao Wang +13 more
doaj +1 more source
MODELING OF PPG SWELLING AND SHRINKAGE
Известия высших учебных заведений: Нефть и газ, 2016 The aim of the work described was to develop a method for selection of a gel. This work involves studying the gel PPG swelling and shrinkage processes.
S. K. Sokhoshko, G. H. Ali
doaj +1 more source
Известия высших учебных заведений: Нефть и газ, 2016 The ultimate goal of this work was to develop a method which can be used in mature oil fields to determine the effective viscosity of the granulated gel (PPG) used for plugging the anthropogenic fractures (after FHF).
S. V. Ovchinnikova, G. H. Ali
doaj +1 more source
Applied Sciences, 2020 Flow separation is undesirable and lowers the efficiency of centrifugal impellers. In this study, the evolution characteristics of separated vortices in a centrifugal impeller are studied under the off-designed flow rate condition.
Shihao Zhou +3 more
doaj +1 more source