This study investigated occupational exposure to silica dust of 48 workers in stone cutting, glass making, ceramic, and sand blasting plants in the north of Iran. Samples were collected from the breathing zone using a personal sampling pump and a size-selective cyclone. Sample filters and blanks were analysed using infrared spectroscopy. The mean sampling period was 4.83 h. Mean exposure of wor...

The Gaza Strip constitutes the south-western part of Palestine. The loess deposits were observed in the Middle and Gaza Governorates in Gaza Strip. This study carried out in the Wadi Gaza where Quaternary loess well crops out. Twenty three samples were collected from nine observation sites in the study area, and performed a textural, calcium carbonate and organic matter content studies. The loe...

Among all of the slope stability methods, use of stone columns and geosynthetic elements can be a good way for stabilizing. One of the efficient ways in order to reinforce earth slopes is Geogrid Encased Stone Column (GESC). This technique can dramatically increase bearing capacity and decrease settlement rate. The aim of this paper is experimentally to investigate a comparison between the beha...

Stone-base, a material often used for base construction in flexible pavements, have recent studies been shown to be suitable as an all – concreting aggregate. This study investigated the crushing, flexural and split tensile strengths well other mechanical properties of stone-base laterized concretes (SBLC). Normal river sand fine aggregate was partially replaced by laterite while coarse proport...

analytical results of 11 groundwater samples are used to evaluate the quality of groundwater in the hastijan area, (central province –iran). the main indices of water, ions physicochemical characteristics and the important heavy metals concentration studied. to estimate of water quality, piper, ghibbs, schoeller and wilcox diagrams, sodium absorption ratio, color-alkalinity and saturation index...

Concrete consisting of sand, stone, water and Portland cement is the most widely used material in construction modern infrastructure [...]

The present investigation aims at the study of properties of concrete in which stone dust is used as a partial replacement for coarse sand and tyre-chips of size 4.7 to 10 mm as partial replacement of coarse aggregate by weight.

avo theory was introduced around 20 years ago. in recent years, this technique was become to a major tool in hydrocarbon sources exploration. by the help of this method with the suitable understanding from underground layers and knowing how to use this technology, quantitative specifications of reservoir can be recognized. avo analysis is a seismic technique that by using of pre-stack data, est...

-We hypothesized that similar bird assemblages will occur in like-structured habitat that results from both clearcutting and high-intensity wildfire followed by salvage logging. To test this, we compared bird communities of sand pine scrub in mature forest and three disturbance treatments (1) high-intensity wildfire, salvage logged, and naturally regenerated, (2) clearcut, roller chopped, and b...