Results 1 to 10 of about 4,848,004 (344)

A Novel Jet Model: Magnetically Collimated, Radiation-Pressure Driven Jet [PDF]

open access: yesPublications of the Astronomical Society of Japan, 2010
Abstract Relativistic jets from compact objects are ubiquitous phenomena in the Unvierse, but their driving mechanism has been an enigmatic issue for several decades. Two basic models have been extensively discussed: magnetohydrodynamic (MHD) jets and radiation-hydrodynamic (RHD) jets. Currently, the former is more widely accepted, since
Takeuchi, S., Ohsuga, K., Mineshige, S.
openaire   +3 more sources

Influence of Complex Load on the Strength and Reliability of Offshore Derrick by Using APDL and Python

open access: yesApplied Sciences, 2022
In an offshore operational environment, complex loads such as the hook load, stand load and wind load play a crucial role in the structural strength and reliability of the offshore derrick. Previous studies have mainly focused on the effect of a specific
Zhengbo Tan   +5 more
doaj   +1 more source

Composite rock-breaking of high-pressure CO2 jet & polycrystalline-diamond-compact (PDC) cutter using a coupled SPH/FEM model

open access: yesInternational Journal of Mining Science and Technology, 2022
CO2 drilling is a promising underbalance drilling technology with great advantages, such as lower cutting force, intense cooling and excellent lubrication.
Can Cai   +4 more
doaj   +1 more source

Heat-fluid-solid coupling mechanism of supercritical carbon dioxide jet in rock-breaking

open access: yesPetroleum Exploration and Development, 2021
Aiming at the synergistic rock-breaking mechanism of supercritical carbon dioxide (SC-CO2) jet pressure and temperature difference, a heat-fluid-solid calculation model of rock-breaking stress was established and verified to be effective, and the ...
Mukun LI   +5 more
doaj   +1 more source

Comparison of jet injection technique with conventional injection technique in patients undergoing endodontic therapy

open access: yesContemporary Clinical Dentistry, 2021
Background: In order to reduce the fear and anxiety of injection during root canal procedures, Madajet injection technique was substituted for the first time among the adult patients to obtain its efficacy and to overcome the painful procedure during the
Mahaboob Shahul Hameed   +4 more
doaj   +1 more source

Effect of abrasive water pressure on the surface layer characteristics of duplex stainless steel 2205

open access: yesMaterials Research Express, 2023
The martensitic stainless steel shot with a high number of cycles was applied to the abrasive water jet (AWJ) to study the effect of jet pressures on the surface layer characteristics of 2205 duplex stainless steel.
Jiawei Liu   +4 more
doaj   +1 more source

Flow Characteristics and Parameter Influence of the Under-Expansion Jet on Circulation Control Airfoil

open access: yesEnergies, 2023
The enhancement in the jet pressure ratio and jet velocity contributes to expanding the control efficiency and control boundary of circulation control airfoil under high subsonic incoming flow. However, because of an excessive jet pressure ratio, the jet
Meng He, Liu Zhang, Chang Li, Lei Zhao
doaj   +1 more source

Jet flow rate and needle position govern distal airway pressures during low‐frequency jet ventilation

open access: yesLaryngoscope Investigative Otolaryngology, 2021
Objectives Although jet ventilation is frequently used during surgery for airway stenosis, little is known about distal airway pressures during jet ventilation.
Joshua Pertile   +5 more
doaj   +1 more source

Detached eddy simulation on the structure of swirling jet flow field

open access: yesPetroleum Exploration and Development, 2022
The improved delayed detached eddy simulation method with shear stress transport model was used to analyze the evolution of vortex structure, velocity and pressure fields of swirling jet.
Jianxiang CHEN   +6 more
doaj   +1 more source

Research on influence characteristics of water jet impact on borehole gas drainage

open access: yesGong-kuang zidonghua, 2020
Water jet based borehole permeability enhancement technology is an effective way to increase coal-seam permeability and gas drainage rate. However, influence characteristics of water jet impact on borehole gas drainage are indeterminate at present.
GAO Yabin   +4 more
doaj   +1 more source

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