Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools) for electronic equipment configuration OH-6A, Army model helicopter without standard lightweight avionics equipment.

"October 1976."

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools) for electronic equipment configuration for CH-47A, CH-47B, and CH-47C helicopters.

"November 1978."

Instructions for installing installation kit, electronic equipment MK-1240/GRC in truck, cargo, 2 1/2 ton, 6x6, M34, M35, M135, or M211, for radio set AN/VRC-46, AN/VRC-53, AN VRC-64, AN/GRC-125, or AN/GRC-160.

"29 November 1973."

Operator's manual : terminal, radio-telephone, mobile subscriber AN/VRC-97 (NSN 5820-01-246-6818) and installation kit, electronic equipment MK-2564/VRC-97 and MK-2565/VRC-97 (NSN 5820-01-246-6873).

"1 March 1989."

Operator and organizational maintenance manual including repair parts and special tool lists : maintenance kit, electronic equipment, MK-1004/ARC.

"March 1968."

Organizational maintenance manual including repair parts list : maintenance kit, electronic equipment, MK-733/ARC-54.1004A/ARC.

"June 1967."

Operator and organizational maintenance manual : maintenance kit, electronic equipment MK-722/URC.

"10 December 1964."

Organizational, direct support, and general support maintenance repair parts and special tools list for maintenance kits, electronic equipment MK-1978A/VRC (NSN 6625-01-078-5893).

Includes index.

General support maintenance repair parts and special tools list for test station, electronic equipment AN/USM-410(V)2 (NSN 6625-01-069-4223).

"18 October 1985."

Organizational and direct support maintenance manual for electronic equipment test facility TADS/PNVS augmentation equipment, 13082808-39, 13231600, 13231650, and 13231800.

"1 February 1986."

Electronic waste governance: sustainable solutions to a global dilemma

Le présent mémoire a pour objet les formes, les caractéristiques et les défis de la gouvernance des déchets électroniques. L’auteure explore les impactes socioéconomiques et environnementales de divers types d’instruments conçus pour mitiger les risques à la santé humaine et à l’environnement que présentent les produits électroniques en fin de vie, notamment: les traités multilatéraux qui visent à prohiber le transfert des déchets hasardeux au pays en développement, les législations régionales, nationales et provinciales mettant en vigueur des systèmes de recyclage obligatoire des déchets électroniques, ainsi que d’autres initiatives, publics et privées, basées sur le principe de la responsabilité élargie des producteurs (REP). L’objectif de ce travail est de comprendre comment les acteurs impliqués dans le commerce de l’équipement électronique peuvent modeler les systèmes de production, d’usage et du traitement fin de vie des technologies contemporaines pour que ces dernières puissent continuer à faire élever les standards de vie et à avancer le développement des communautés humaines, en respectant simultanément le principe international de l’équité globale, l’environnement naturel et la qualité de vie des générations futures.

A high efficiency HPF-ZCS-PWM Sepic for electronic ballast with multiple tubular fluorescent lamps

This paper presents a high efficiency Sepic rectifier for an electronic ballast application with multiple fluorescent lamps. The proposed Sepic rectifier is based on a Zero-Current-Switching (ZCS) Pulse-Width-Modulated (PWM) soft-commutation cell. The high power-factor of this structure is obtained using the instantaneous average-current control technique, in order to attend properly IEC61000-3-2 standards. The inverting stage of this new electronic ballast is a classical Zero-Voltage-Switching (ZVS) Half-Bridge inverter. A proper design methodology is developed for this new electronic ballast, and a design example is presented for an application with five fluorescent lamps 40W-T12 (200W output power), 220Vrms input voltage, 130Vdc dc link voltage, with rectifier and inverter stages operating at 50kHz. Experimental results are also presented. The THD at input current is equal to 6.41%, for an input voltage THD equal to 2.14%, and the measured overall efficiency is about 92.8%, at rated load.

Setting the preheating process of electronic ballasts for hot-cathode fluorescent lamps, considering the Rh/Rc ratio

This paper presents a new model for the representation of the electrodes filaments of fluorescent lamps, during their preheating, and an analysis capable to guide the design of the preheating process in electronic ballasts. The main improvement obtained with the lamp model is the accurate theoretical reproduction of the behavior of the Rh/Rc ratio during the preheating process. In addition, using the proposed methodology based on the lamp model, it is possible to set a proper preheating process to the electrodes filaments, without the necessity of exhaustive empirical adjustments in the prototype, reducing time and costs involved in the design of ballasts with preheating capabilities. © 2006 IEEE.

Analysis of the influence of baffles and shields on the cooling of a digital transmission equipment

In this work design criteria for cooling of electronic systems used in a digital transmission equipment are considered. An experimental study using a simulated electronic equipment in which vertically oriented circuit boards are aligned to form vertical channels is carried out. Resistors are used to simulate actual components. The temperature of several components in the printed circuit boards are measured and the influence of the baffles and shields on the cooling effect are discussed. It was observed that the use of the baffles reduce the temperature levels and, the use of shields, although protecting the components from magnetic effects, cause an increase in the temperature levels.