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2021-8-8 · Many construction tasks create dust. High dust levels are caused by one of more the following: equipment – using high energy tools, such as cut-off saws, grinders, wall chasers and grit blasters produce a lot of dust in a very short time; work method – dry sweeping can make a lot of dust when compared to vacuuming or wet brushing; work area
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2019-2-1 · Learn about crystalline silica (quartz dust), which can raise your risk of lung cancer. Crystalline silica is present in certain construction materials such as concrete, masonry, and brick and also in commercial products such as some cleansers
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The results demonstrate that the quartz oxygen isotope ratios of the Taklimakan desert and the Mongolian Gobi are more heterogeneous compared with the other areas. The quartz
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Quartz extraction and purification is essential for the successful measurement of 10Be and 26Al by AMS for exposure dating. The common procedure involves repetitive etching by ultrasonic heating
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2018-7-17 · The industrial sand industry deals with high-purity quartz sand and has been the subject of several previous mortality studies of silicosis, lung cancer, and kidney disease. In this work, RQ exposures were retrospectively estimated for 67 radiographically-identified silicosis cases and 167 matched controls from the industrial sand workforce
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2018-5-3 · The α-quartz diffraction lines 4.26 Å, 3.34 Å and 1.82 Å appeared at 2θ angles of 20.85°, 26.67° and 50.15°, respectively. The integrator subtracted the background intensity using numerical peak fitting and interpolation. The net peak area reported by the instrument was alternatively used as the diffraction line intensity
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Wood et al. (1990) measured intragranular porosity in quartz-rich glacial outwash sands from Cape Cod, Massachusetts and found that on average, 9% of the grain volume was internal pore space. Ball et al. (1990) found 1–5% internal pore space within the grains of an outwash sand from the Canadian Forces Base Borden in Ontario; this sand
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2021-2-25 · The Cheese Connection . Cambria is a brand that represents a huge chunk of the U.S. market for quartz countertops, yet few people know one bit of interesting trivia about this American-owned company: The company also makes cheese.. The Davis family business, now based in Eden Prairie, Minnesota, began in the 1930s as a dairy business that gradually expanded into an association of
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Work is progressing from west to east. Earth MRI critical mineral focus areas Locations of focus areas to be used in the Earth Mapping Resource Initiative (Earth MRI) for planning and collection of geophysical, geological, and topographic (lidar) data pertaining to the study of rare earth element resources in the US
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