Dynamical Constrained Impulse System and application for designing discontinuous feedbacks

2007 ◽  
Author(s):  
Patrick Saint-Pierre
Keyword(s):  
Impulse System

A continuous profile of sea ice and freshwater ice thickness by impulse radar

Polar Record ◽  
1974 ◽  
Vol 17 (106) ◽  
pp. 31-41 ◽  
Author(s):  
K. J. Campbell ◽  
A. S. Orange
Keyword(s):  
Feasibility Study ◽  
Sea Water ◽  
Time Profile ◽  
Ice Thickness ◽  
Water Ice ◽  
Shallow Subsurface ◽  
Impulse System ◽  
Chart Recorder ◽  
Single Trace ◽  
Subbottom Profiling

For several years. Geophysical Survey Systems, Inc has been using an impulse radar system as a shallow subsurface exploration tool for engineering applications. Recently this system has been applied to the measurement of ice thicknesses both on sea-water and fresh-water ice. In the course of a feasibility study performed in December 1972, thebasic operating parameters and limitations of the tool when operated on ice were determined. Following the feasibility study, operational surveys were performed totalling approximately 11 crew-months and covering in excess of 1 500 km of survey route at several locations in the Canadian Arctic. The technique is known as Electromagnetic Subsurface Profiling (ESP), and it can be considered the electromagnetic equivalent of the single-trace acoustic profiling methods used for marine subbottom profiling. In practice, ice-thickness profiling is done by towing a sled-mounted antenna behind a tracked vehicle containing the impulse system (Fig 1). Real-time profile data are displayed graphically on a strip-chart recorder. The data may also be recorded on magnetic tape for later processing and playback.

scholarly journals The Effect of A-V Impulse System on Swelling of the Lower Limb after Hip Joint Surgery.

1997 ◽  
Vol 46 (4) ◽  
pp. 1007-1009
Author(s):  
Jun Nishio ◽  
Jun Arimizu ◽  
Minoru Ikeda
Keyword(s):  
Hip Joint ◽  
Lower Limb ◽  
Joint Surgery ◽  
Impulse System ◽  
Hip Joint Surgery

scholarly journals Sources of backscatter at 5.3 GHz from a superimposed ice and firn area revealed by multi-frequency GPR and cores

2009 ◽  
Vol 55 (190) ◽  
pp. 373-383 ◽  
Author(s):  
Kirsty Langley ◽  
Pascal Lacroix ◽  
Svein-Erik Hamran ◽  
Ola Brandt
Keyword(s):  
Ground Penetrating Radar ◽  
Continuous Wave ◽  
Wave System ◽  
Air Bubble ◽  
Radar Systems ◽  
Impulse System ◽  
Polythermal Glacier ◽  
Bubble Number ◽  
Ground Penetrating ◽  
Previous Summer

AbstractWe investigate the major sources of backscatter at 5.3 GHz, within the superimposed ice and firn areas of a polythermal glacier. Two ground-penetrating radar systems, an 800 MHz impulse system and a polarimetric 5.3 GHz frequency-modulated continuous-wave system, are used to acquire along-glacier profiles in the accumulation area of Kongsvegen, Svalbard. The 800 MHz response is used to map reflection horizons in the glacier. Using cores from the superimposed ice and firn areas, the causes of these reflection horizons, in terms of snow, firn and ice layers, are investigated. Superimposing the reflection horizons on the co-polarized and cross-polarized 5.3 GHz profile, we are able to determine how the 5.3 GHz frequency responds to the different media. Scattering at rough interfaces and volume scattering occur in the superimposed ice area and are apparently caused by air-bubble number, size and distribution. In the firn the strongest return originates from below the previous summer surface, consistent with previous findings. At approximately the same depth, strong incoherent scattering begins. The rapid decrease in coherent reflections indicates the significance of scattering in the firn.

Graduated Compression Stockings Reduce the Venous Velocity Augmentation of Foot Pumps

2004 ◽  
Vol 90 (3) ◽  
pp. 142-146
Author(s):  
David Higgs ◽  
Michael Uglow ◽  
Theresa Fail
Keyword(s):  
Clinical Trial ◽  
Clinical Trials ◽  
Total Hip Arthroplasty ◽  
Femoral Vein ◽  
Randomised Clinical Trial ◽  
Compression Stockings ◽  
Common Femoral Vein ◽  
Impulse System ◽  
The Common ◽  
Graduated Compression Stockings

AbstractThe use of the A-V Impulse System of foot pumps and graduated compression stockings to reduce the incidence of thrombo-embolic disease after total hip arthroplasty is well recognised. It is not known if they have a synergistic effect as all clinical trials have used them in combination.We examined the effect compression stockings had on the ability of the A-V Impulse System to accelerate peak venous velocities in the common femoral vein in ten healthy volunteers using a duplex scanner.The use of foot pumps without stockings produced the greatest increase in peak venous velocity and this was 34% greater than using a foot pump with stockings.It is not known if this difference could account for a reduction in thrombo-embolic episodes and so we propose a randomised clinical trial.

Epithelial action potentials in embryos of the Australian lungfish

1989 ◽  
Vol 237 (1286) ◽  
pp. 127-131 ◽  
Keyword(s):  
Epithelial Cells ◽  
Action Potentials ◽  
Rapid Rise ◽  
Impulse System ◽  
Australian Lungfish

The epithelial cells of the skin of embryonic Australian lungfish (Neoceratodus forsteri) between stages 30 and 39, are mechanosensitive and excitable, showing overshooting action potentials 400-800 ms long with a rapid rise followed by a slower repolarization (usually with a shoulder on the repolarizing phase), which propagate at around 10 mm s -1 . This skin impulse system is very similar to that found in embryonic and larval Amphibia; the significance of this similarity is discussed.

Mechanical impulse system for myotatic reflex investigation

1984 ◽  
Vol 22 (5) ◽  
pp. 458-460 ◽  
Author(s):  
H. Vermariën ◽  
L. Maes ◽  
F. Vereecke
Keyword(s):  
Impulse System ◽  
Mechanical Impulse
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