An innovative experimental approach for nonlinear dynamic physical simulation using a reconfigurable test setup

2012 ◽  
pp. 3723-3730
Author(s):  
A Rank ◽  
H Yun ◽  
J Caffrey ◽  
S Masri
Keyword(s):  
Nonlinear Dynamic ◽  
Experimental Approach ◽  
Physical Simulation ◽  
Test Setup

Semi-physical Simulation Platform of a Parafoil Nonlinear Dynamic System

2013 ◽  
Vol 30 (11) ◽  
pp. 110503 ◽  
Author(s):  
Hai-Tao Gao ◽  
Sheng-Bo Yang ◽  
Er-Lin Zhu ◽  
Qing-Lin Sun ◽  
Zeng-Qiang Chen ◽  
...  
Keyword(s):  
Dynamic System ◽  
Nonlinear Dynamic ◽  
Physical Simulation ◽  
Nonlinear Dynamic System ◽  
Simulation Platform

An Experimental Approach for the Offshore Launching of Jack-Ups

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Claudio A. Rodríguez ◽  
Mário Moura ◽  
Paulo T. T. Esperança ◽  
Jacques Raigorodsky
Keyword(s):  
Feasibility Study ◽  
Experimental Approach ◽  
Model Tests ◽  
Building Site ◽  
Test Setup ◽  
Dry Dock ◽  
Jack Up

Recently, as part of the building contract for the new Brazilian jack-up drilling platforms, an operational challenge was raised: to launch these units from the building site, where neither dry dock nor launching ground ways exist. Economically, the best alternative was to launch these jack-ups using the available barges used commonly for jacket launch. Due to the marked differences between a jacket and a jack-up, the implementation of this novel launch operation required a careful feasibility study. Model tests were required to measure the motions of the barge and the jack-up and to evaluate the loads on the barge rocker arms. The present paper discusses the experimental approach, test setup, calibration procedures, and some results from the hydrodynamics perspective.

Experimental Determination of the Effective Resolution Limit in Thick Specimens at High Voltages

1975 ◽  
Vol 33 ◽  
pp. 664-665
Author(s):  
Mircea Fotino
Keyword(s):  
Experimental Approach ◽  
Chromatic Aberration ◽  
Resolving Power ◽  
Biological Research ◽  
Specimen Thickness ◽  
Resolution Limit ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
Resolution Level

The use of thick specimens (0.5 μm to 5.0 μm or more) is one of the most resourceful applications of high-voltage electron microscopy in biological research. However, the energy loss experienced by the electron beam in the specimen results in chromatic aberration and thus in a deterioration of the effective resolving power. This sets a limit to the maximum usable specimen thickness when investigating structures requiring a certain resolution level.An experimental approach is here described in which the deterioration of the resolving power as a function of specimen thickness is determined. In a manner similar to the Rayleigh criterion in which two image points are considered resolved at the resolution limit when their profiles overlap such that the minimum of one coincides with the maximum of the other, the resolution attainable in thick sections can be measured by the distance from minimum to maximum (or, equivalently, from 10% to 90% maximum) of the broadened profile of a well-defined step-like object placed on the specimen.

Malfunctional Reorganization in the Developing Limbo-Prefrontal System in Animals: Implications for Human Psychoses?

2001 ◽  
Vol 12 (1) ◽  
pp. 8-14
Author(s):  
Gertraud Teuchert-Noodt ◽  
Ralf R. Dawirs
Keyword(s):  
Prefrontal Cortex ◽  
Mental Disorders ◽  
Dentate Gyrus ◽  
Cognitive Functions ◽  
Experimental Approach ◽  
Regulatory Mechanisms ◽  
Hippocampal Dentate Gyrus ◽  
Non Invasive ◽  
Invasive Method ◽  
Activity Dependent

Abstract: Neuroplasticity research in connection with mental disorders has recently bridged the gap between basic neurobiology and applied neuropsychology. A non-invasive method in the gerbil (Meriones unguiculus) - the restricted versus enriched breading and the systemically applied single methamphetamine dose - offers an experimental approach to investigate psychoses. Acts of intervening affirm an activity dependent malfunctional reorganization in the prefrontal cortex and in the hippocampal dentate gyrus and reveal the dopamine position as being critical for the disruption of interactions between the areas concerned. From the extent of plasticity effects the probability and risk of psycho-cognitive development may be derived. Advance may be expected from insights into regulatory mechanisms of neurogenesis in the hippocampal dentate gyrus which is obviously to meet the necessary requirements to promote psycho-cognitive functions/malfunctions via the limbo-prefrontal circuit.

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