نتایج جستجو برای: electrical discharge

تعداد نتایج: 290656  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علم و صنعت ایران - دانشکده مهندسی مکانیک 1384

ماشینکاری تخلیه الکتریکی (edm) ، یک فرآیند ماشینکاری غیر سنتی با مخصوص محسوب می شود که امروزه در حال جایگزینی با عملیات ماشینکاری سنتی از قبیل دریل کاری، تراشکاری و غیره می باشد. این فرآیند برای شکل دهی فلزات سخت، فرم دهی های عمیق و شکل دهی پیچیده سوراخ ها بوسیله فرسایش جرقه در تمام انواع مواد های الکتریسیته بکار گرفته می شوند. در این بررسی در مورد جزئیات پیش آمده در نرخ باربرداری (mrr)، نسبت ف...

1999
ANTHONY J. M. VERBERNE DANIELA M. SARTOR Daniela M. Sartor

Verberne, Anthony J. M., Daniela M. Sartor, and Ayse Berke. Midline medullary depressor responses are mediated by inhibition of RVLM sympathoexcitatory neurons in rats. Am. J. Physiol. 276 (Regulatory Integrative Comp. Physiol. 45): R1054–R1062, 1999.—Mechanisms underlying the depressor and sympathoinhibitory responses evoked from the caudal medullary raphe (MR) region were investigated in pent...

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 1999
Anthony J M Verberne Daniela M Sartor Ayse Berke

Mechanisms underlying the depressor and sympathoinhibitory responses evoked from the caudal medullary raphe (MR) region were investigated in pentobarbital sodium-anesthetized, paralyzed rats. Intermittent electrical stimulation (0.5 Hz, 0.5-ms pulses, 200 μA) of the MR elicited a mixed sympathetic response that consisted of a long-latency sympathoexcitatory (SE) peak (onset = 146 ± 7 ms) superi...

2009
M. K. Pradhan C. K. Biswas

In this research, Response Surface Methodology (RSM) is used to investigate the effect of four controllable input variables namely: discharge current, pulse duration, pulse off time and applied voltage Surface Roughness (SR) of on Electrical Discharge Machined surface. To study the proposed second-order polynomial model for SR, a Central Composite Design (CCD) is used to estimation the model co...

Kamal Kumar Jangra Vikas Kumar Vinod Kumar

In the present work, an experimental investigation on wire electrical discharge machining (WEDM) of Monel-400 has been presented. Monel-400 is a nickel–copper-based alloy, mostly employed in ships and corrosion-resisting applications. Four input WEDM parameters namely discharge current (Ip), pulse-on time (Ton), pulse-off time (Toff) and servo voltage (SV) have been investigated and modeled for...

2015
Ningyu Liu Matthew G. McHarg Hans C. Stenbaek-Nielsen

The purpose of this paper is to introduce electrical discharge phenomena known as transient luminous events above thunderstorms to the lightning protection community. Transient luminous events include the upward electrical discharges from thunderstorms known as starters, jets, and gigantic jets, and electrical discharges initiated in the lower ionosphere such as sprites, halos, and elves. We gi...

2014
M. H. Ahmad N. Bashir H. Ahmad A. A. Abd Jamil A. A. Suleiman

Nowadays, the most widely used insulating materials in high voltage equipment such as cables are polymeric insulations due to the numerous merits they possess with regards to electrical performance compared to paper insulations. However, electrical treeing, one of the dielectric pre-breakdown phenomena, has been considered as a major contribution to the failure of insulating polymeric materials...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 1999
R Demir L B Haberly M B Jackson

When near-threshold electrical stimulation is used to evoke epileptiform discharges in brain slices, a latent period of up to 150 msec elapses before the discharge begins. During this period most neurons are silent, and abnormal electrical activity is difficult to detect with microelectrodes. A fundamental question about epileptiform activity concerns how synchronous discharges arise abruptly i...

2007
M. Leštinský M. Janda Z. Machala K. Hensel

Generation of microdischarges inside porous ceramics by AC high voltage has been investigated. Electrical and optical measurements were performed to explore the physical properties of the microdischarges. The effect of pore size, discharge power and gas mixture on the discharge properties and development is described. Introduction Research of various types of non-thermal plasmas generated by el...

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