Results 1 to 10 of about 11,478,449 (349)

Impact angle control of interplanetary shock geoeffectiveness [PDF]

Journal of Geophysical Research: Space Physics, 2014
AbstractWe use Open Geospace General Circulation Model global MHD simulations to study the nightside magnetospheric, magnetotail, and ionospheric responses to interplanetary (IP) fast forward shocks. Three cases are presented in this study: two inclined oblique shocks, hereafter IOS‐1 and IOS‐2, where the latter has a Mach number twice stronger than ...
Oliveira, D. M., Raeder, J.
openaire   +2 more sources

Regenerative tourism: the challenge of transformational leadership [PDF]

Journal of Tourism Futures, 2022
Purpose – The aims of this paper are to share how one cohort of tourism practitioners viewed the transformative change needed within the tourism industry and to explore the implications for leadership in the future.
Jenny Cave, Dianne Dredge, Claudia van't Hullenaar, Anna Koens Waddilove, Sarah Lebski, Olivier Mathieu, Marta Mills, Pratishtha Parajuli, Mathias Pecot, Nico Peeters, Carla Ricaurte-Quijano, Charlotte Rohl, Jessica Steele, Birgit Trauer, Bernadette Zanet   +14 more
doaj   +1 more source

Adaptive Sliding Mode Guidance With Impact Time and Angle Constraints

IEEE Access, 2020
Based on adaptive sliding mode control method, this paper considers the interception problem to deal with both impact time and angle constraints. The stability and convergence characteristic of proposed guidance law are analyzed.
Xiaodong Liu, Guofei Li
doaj   +1 more source

Probing Magnetic Pulse Welding of Thin-Walled Tubes

Journal of Manufacturing and Materials Processing, 2020
Magnetic pulse welding is a solid-state joining technology, based on the use of electromagnetic forces to deform and to weld workpieces. Since no external heat sources are used during the magnetic pulse welding process, it offers important advantages for
Koen Faes, Rishabh Shotri, Amitava De
doaj   +1 more source

The effect of impingement angle on erosion wear characteristics of HVOF sprayed WC-Ni and WC-Cr3C2-Ni cermet composite coatings

Materials Research Express, 2020
The present study investigated the erosion wear behavior of WC-Ni and WC-Cr _3 C _2 -Ni cermet coatings deposited by high velocity oxy-fuel (HVOF) spray process on the substrate of 1Cr18Ni9Ti stainless steel.
Yirui Chen, Yuping Wu, Sheng Hong, Weiyang Long, Xiulin Ji   +4 more
doaj   +1 more source

Erosion Behaviour of API X100 Pipeline Steel at Various Impact Angles and Particle Speeds

Metals, 2016
Erosion is the gradual removal of material due to solid particle impingement and results in a failure of pipeline materials. In this study, a series of erosion tests were carried out to investigate the influence of particle speed and impact angle on the ...
Paul C. Okonkwo, Rana Abdul Shakoor, Moustafa M. Zagho, Adel Mohamed Amer Mohamed   +3 more
doaj   +1 more source

Definition of Impact Angle and Impact Angle Control Law Against Maneuvering Target

Journal of the Korean Society for Aeronautical & Space Sciences, 2015
In this paper, a guidance law for intercepting maneuvering target with a desired impact angle is proposed. The proposed guidance law is modified from the optimal impact angle control law for a fixed target and given by a biased PN law with the impact angle control term in addition to the conventional PN law.
Hyun-Seung Kim, Sang-Sup Park, Chang-Kyung Ryoo   +2 more
openaire   +2 more sources

Erosion Behavior of Steel Pipes Carrying of Some Iraqi Crude Oils [PDF]

Engineering and Technology Journal, 2016
This paper deals with erosion that is defined as a process of progressive removal of material from a target surface due to repeated impacts of solid particles for the special case of two phases (liquid and solid). Experimental investigation dependence on
Ali H. Ataiwi, Ayad K. Hassan, Ban A.F. Al-Saadi   +2 more
doaj   +1 more source

Light's Bending Angle due to Black Holes: From the Photon Sphere to Infinity [PDF]

, 2006
The bending angle of light is a central quantity in the theory of gravitational lensing. We develop an analytical perturbation framework for calculating the bending angle of light rays lensed by a Schwarzschild black hole.
A. O. Petters, A.O Petters, A.O. Petters, C.R. Keeton, C.R. Keeton, C.R. Keeton, C.S. Kochanek, E.F. Eiroa, H. Ohanian, J. Bodener, J.-P. Luminet, K.S. Virbhadra, P. Schneider, P.F. Byrd, R.D. Atkinson, S. Frittelli, S. V. Iyer, V. Bozza, V. Bozza, V. Bozza, V. Bozza, V. Bozza, V. Perlick   +22 more
core   +2 more sources

Impact-Sliding of Sintered Steel: Effect of Lubrication

Tribology Online, 2013
Sintered steel is used as a material for valve seat insert in automotive engines. During operation, a dynamic contact occurs between the valve and its seat.
Maha Messaadi, Gaetan Bouvard, Philippe Kapsa   +2 more
doaj   +1 more source