Dynamics of vibrating systems with tuned liquid column dampers and limited power supply

Tuned liquid column dampers are U-tubes filled with some liquid, acting as an active vibration damper in structures of engineering interest like buildings and bridges. We study the effect of a tuned liquid column damper in a vibrating system consisting of a cart which vibrates under driving by a source with limited power supply (non-ideal excitation). The effect of a liquid damper is studied in some dynamical regimes characterized by coexistence of both periodic and chaotic motion. (c) 2005 Elsevier Ltd. All rights reserved.

Operator's and organizational maintenance manual : radio sets AN/VRC-53 (NSN 5820-00-223-7467), AN/VRC-64 (NSN 5820-00-223-7475), AN/GRC-125 (NSN 5820-00-223-7411), and AN/GRC-160 (NSN 5820-00-223-7473), and amplifier-power supply groups OA-3633/GRC and OA-3633A/GRC (NSN 5820-00-973-3383).

Includes index.

Organizational maintenance repair parts and special tools list for radio sets AN/VRC-53 (NSN 5820-00-223-7467), AN/VRC-64 (NSN 5820-00-223-7475), AN/GRC-125 (NSN 5820-00-223-7411), and AN/GRC-160 (NSN 5820-00-223-7473), and amplifier, power supply groups OA-3633/GRC and OA-3633A/GRC (parts list for OA-3633/GRC and OA-3633A/GRC (NSN 5820-00-973-3383) only)).

"4 December 1981."

DS, GS, and depot maintenance manual : radio sets AN/VRC-53, AN/VRC-64, AN/GRC-125, and AN/GRC-160 and amplifier-power supply groups, OA-3633/GRC and OA-3633A/GRC.

"December 1969."

Direct support and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for radio sets AN/VRC-53, AN/VRC-64, AN/GRC-125, and AN/GRC-160 and amplifier, power supply groups OA-3633/GRC and OA-3633A/GRC (parts list for OA-3633/GRC and OA-3633A/GRC, NSN 5820-00-973-3383, only).

Includes index.

Simulation model for driving dynamics, energy use and power supply

Dissertação para obtenção do grau de Mestre em Engenharia Electrotécnica Ramo de Energia

Reliability stress and failure rate data for electronic equipment.

Cover title.

Operator, organizational, and direct support maintenance manual for test set, electronic system AN/TSM-100A, (NSN 4933-01-047-3389).

Includes index.

Operator, organizational, DS, GS, and depot maintenance manual including repair parts and special tool lists : test set, electronic system AN/ASM-338.

"March 1968."

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."

Reversible current power supply for fast-field cycling nuclear magnetic resonance equipment

The Fast Field-Cycling Nuclear Magnetic Resonance (FFC-NMR) is a technique used to study the molecular dynamics of different types of materials. The main elements of this equipment are a magnet and its power supply. The magnet used as reference in this work is basically a ferromagnetic core with two sets of coils and an air-gap where the materials' sample is placed. The power supply should supply the magnet being the magnet current controlled in order to perform cycles. One of the technical issues of this type of solution is the compensation of the non-linearities associated to the magnetic characteristic of the magnet and to parasitic magnetic fields. To overcome this problem, this paper describes and discusses a solution for the FFC-NMR power supply based on a four quadrant DC/DC converter.

Graphoepitaxy of CeO2 on MgO and its application to the fabrication of 45° grain boundary Josephson junctions of YBa2Cu3O7-x

We communicate a detailed study of the epitaxial growth of CeO2 on MgO. The key feature of the growth is the dependence of the in¿plane orientation of the CeO2 epitaxial layer on the MgO surface morphology. Atomic force microscopic (AFM) measurements, x¿ray analyses, as well as high¿resolution transmission electron microscopy (HRTEM) investigations reveal that on rough substrates a cube¿on¿cube growth of CeO2 on MgO occurs while on smooth substrates the CeO2 unit cell is rotated around the surface normal by 45° with respect to the MgO unit cell when the deposition rate is low (~0.3 Å/s) during the first stages of growth. This growth mechanism can be used for a defined fabrication of 45° grain boundaries in the CeO2 layer by controlling the surface roughness of the MgO substrate. This report demonstrates that these 45° grain boundaries may be used to fabricate YBa2Cu3O7¿x Josephson junctions.