This paper deals with the experimental results of a xenon flash-lamp pumped passively Q-switched Nd:YAG laser using Cr4+:YAG saturable absorber. The need of a laser cavity to be integrated into a time-of-flight laser range finder is of great interest as an experimental investigation of several laser resonators. Two types of laser resonator, with different lengths, have been studied: the flat-fl...

This study aimed to evaluate Laser-cutting process of Mild Steel St37 sheets with two different thicknesses. In order to evaluate the quality of cutting edge and the depth of the area affected by the heat, several tests were conducted to determine the effect of parameters such as Laser power, Laser beam movement speed and pressure of axillary gas on the quality of cutting edge and the depth of ...

Virtually all Satellite Laser Ranging (SLR) stations produce a real-time display known as an Observed-Minus-Calculated (OMC) plot. In such a plot, illustrated in Figure 1, the horizontal axis displays the elapsed time during the track while the vertical axis displays the measured ranges to the target plus any false alarms as points on the plot. The vertical axis is dynamically centered on the p...

Scheduling of contacts between several satellites and ground stations has been historically sub-optimally approached. This fact raises the question: can this problem be solved in polynomial time? Although existing literature provided optimal solutions for some simplified versions of this problem and studied some connections with general scheduling, fewhas been said on the complexity ofmore gene...

Introduction To DETERM INE THE ORBIT OF AN EARTH SATELLITE, or conversely, to use a known satellite orbit to find the location of a point on the earth, it is necessary to use some sort of electromagnetic signal (light or radio signal) passing between the satellite and the earth station. This signal traverses the earth's atmosphere, where its velocity is not the same as in free space (the index ...

BACKGROUND Understanding the long-distance movement of bats has direct relevance to studies of population dynamics, ecology, disease emergence, and conservation. METHODOLOGY/PRINCIPAL FINDINGS We developed and trialed several collar and platform terminal transmitter (PTT) combinations on both free-living and captive fruit bats (Family Pteropodidae: Genus Pteropus). We examined transmitter wei...

The satellite scheduling community has provided several algorithms for allocating interaction windows between ground stations and satellites, from simple greedy approaches to more complex hybrid-genetic or Lagrangian-relaxation techniques. Single-location ground station problems, where requests have fixed time intervals and no priorities, are known to be solvable in polynomial time. To the best...

A satellite remote sensing methodology has been developed to retrieve 3D ice water content (IWC) and mean effective ice crystal size of cirrus clouds from satellite data on the basis of a combination of the conventional retrieval of cloud optical depth and particle size in a horizontal plane and a parameterization of the vertical cloud profile involving temperature from sounding and/or analysis...