A detailed description of the CLEARFAST system for thermal IR stand-off minefield survey is given. The system allows (i) a stand-off diurnal observation of hazardous area, (ii) detecting anomalies, i.e. locating and searching for targets which are thermally and spectrally distinct from their surroundings, (iii) estimating the physical parameters, i.e. depth and thermal diffusivity, of the detec...

A comprehensive experimental study on the high-velocity oxygen-fuel (HVOF) sprayed tungsten carbide/cobalt (WC/Co) deposits using laser cladding was conducted. response surface methodology based a central composite design used to analyze, predict and optimize WC/Co of laser-based HVOF coatings. The morphologies microstructures clads were characterized optical microscope, scanning electron micro...

In laser manufacturing, the cutting parameters, such as power, speed, assist gas pressure, and stand off distance, have a great influence on quality of machined parts. To ensure part, process information (cutting parameters) needs to be manually assigned adjusted according different geometry characters part edges, like arc line segment. The contours are then used for generating paths, leaving b...

Flash illumination is widely used in imaging under low-light environments. However, intensity falls off with propagation distance quadratically, which poses significant challenges for flash at a long distance. We propose new technique, named “patterned flash”, Patterned concentrates optical power into dot array. Compared the conventional uniform where signal overwhelmed by noise everywhere, pat...

in order to study the qualitative, quantitative characteristics of a pure common populus alba stand in polkalleh & a mixed stand of populus alba & populus nigra in karchegan, two 30-year-old stands were selected with a plantation interval ( spacing) of 2.5 × 1.5 m in each of which 30 pcs of 2 are samples were randomly selected. in each sample pc all the trees diameters were measured using a dia...

This study performed a fluid/material coupled numerical simulation of the first stage non-spherical collapse bubble near wall and investigated stress state inside elastic material according to change in stand-off distance γ between wall. The relationship behavior propagation waves was confirmed for typical modes: pancake-shaped mode at = −0.3, hemispherical 0, microjet 0.3 < 1.0, detaching &...

This study reports a new hybrid integrated technique to predict the absorptivity of absorber and interface temperature joint in laser transmission welding. The approach is more robust as numerical model confirmed through experimental observations initially with weld width further surface temperature. Experiments are performed on polycarbonate sheets electrolytic iron powder (EIP) an absorber. m...

Cavitation erosion often occurs on the surface of many underwater applications, which can cause severe damage to materials and reduce their performance. Since is impact pressure induced by collapse an individual cavitation bubble near wall, make a better prediction prevent potential, in this paper, we carry out systematic investigations characteristics direct numerical simulation using vapor mo...

evaluating the forest stands structure in different development stages is one of the ways for better understanding the forest dynamics and its response to natural disturbances. this study was carried out in the compartment 319, kheiroud forest in order to quantify the structure properties of mixed beech stands in the stem exclusion phase. for this purpose, three one-hectare sample plots were se...