نتایج جستجو برای: plasma arc cutting

تعداد نتایج: 428186  

Journal: :journal of dentistry, tehran university of medical sciences 0
m. hashem-hoseini assistant professor, department of orthodontics, school of dentistry, tehran university of medical s h. mahmood-hashemi orthodontist, dental research center, tehran university of medical sciences, tehran, iran f. soltan-moradi laser research center, atomic energy organization of iran t. hooshmand assistant professor, department of dental materials, school of dentistry, tehran university of medic i. haririan associate professor, department of pharmaceutics, school of pharmacy, tehran university of medical s j. chalipa assistant professor, department of orthodontics, school of dentistry, tehran university of medical s

objective: nowadays light-cured composites are used widely by orthodontists to bond brackets. as these composites require 20-40 seconds time per tooth to be light cured, more chair-time in needed compared to self-cured composites. in recent years, the argon laser and plasma arc lights have been introduced in dentistry to reduce this curing time. the purpose of this study was to compare bond str...

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Journal: :Scientific American 1901

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Journal: :Oper. Res. Lett. 2001
Alper Atamtürk

i∈N yi ≤ b, yi ≤ uixi ∀i ∈ N}, where variable yi is the flow on arc i with capacity ui, xi is a binary variable that indicates whether arc i is open or closed, and N = N ∪N. The single node fixed–charge flow model is interesting not only because it is a relaxation of the fixed–charge network flow problem, but also because it is possible to derive relaxations of the form S of a general MBIP prob...

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2008
Majid MAHDAVI

In the search to obtain a better understanding of switching arc phenomena in the current intemrption, our attention has been focused on the study of arc plasma behavior in the alternative current circuit breaker. In this paper a comparison between intemrption capability of sulfur hexafluoride (SF6) and nitrogen (Nz) ballast arcs are made and we present physical aspects and characteristics of ar...

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1998
P. J. S. Williams C. F. del Pozo I. Hiscock R. Fallows

The drift velocity of an auroral arc is compared with the component of F-region plasma velocity in the same direction for ten cases where the arc is seen to move steadily equatorward for several minutes without any major change in appearance or orientation. In most cases the two velocities are close, but on two occasions the drift velocity of the arc is much higher than the plasma velocity. Fro...

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2012
J P Trelles E Pfender J V R Heberlein

The need to improve plasma spraying processes has motivated the development of computational models capable of describing the arc dynamics inside plasma torches. Although progress has been made in the development of such models, the realistic simulation of the arc reattachment process, a central part of the arc dynamics inside plasma torches, is still an unsolved problem. This study presents a ...

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Journal: :Journal of Physics D: Applied Physics 2013

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Journal: :Jurnal Dinamika Vokasional Teknik Mesin 2019

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2010
Y. Nishimura L. R. Lyons S. Zou X. Xing V. Angelopoulos S. B. Mende J. W. Bonnell D. Larson U. Auster T. Hori N. Nishitani K. Hosokawa G. Sofko M. Nicolls C. Heinselman

[1] Using two conjunction events of the Time History of Events and Macroscale Interactions during Substorms (THEMIS) imagers and spacecraft as well as the Super Dual Auroral Radar Network (SuperDARN) and Poker Flat Incoherent Scatter Radars, we show that longitudinally narrow flow bursts in the nightside polar cap can precede poleward boundary intensifications (PBIs) that are followed by equato...

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Journal: :The International Journal of Advanced Manufacturing Technology 2022

This work aimed to evaluate whether the established scientific knowledge for machining homogeneous and isotropic materials remains valid additively manufactured parts. The machinability of thin-walled structures produced through two different variants wire arc additive manufacturing (WAAM) was studied, namely conventional MIG deposition innovative hot forging variant (HF-WAAM). Cutting operatio...

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نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید

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