نتایج جستجو برای: mineral scale deposition
تعداد نتایج: 726595 فیلتر نتایج به سال:
Mineral dust deposition is suggested to be a significant atmospheric supply pathway of bioavailable iron (Fe) to Fe-depleted surface oceans. In this study, mineral dust and dissolved Fe (Fed) deposition rates are predicted for March 2009 to February 2010 using the 3-D chemical transport model GEOS-Chem implemented with a comprehensive dust-Fe dissolution scheme. The model simulates Fed producti...
This report describes work completed during the eleventh quarter of a DOE-funded study of mineral transformations and ash deposition during staged combustion. Accomplishments included repairs and improvements to the laboratory combustor, collection of deposits and observation of deposition behavior as a function of operating conditions, and analysis of deposit samples collected under both stage...
Indurated surficial veneers are a characteristic phenomenon on exposures of unjointed granite in the southeastern states. They are caused by deposition of iron oxides in the interstices between the partially disaggregated mineral grains of the "sap" rock at the surface of the exposure. Breaching of veneers produces such peculiar erosional forms as weather pits, cavernous boulders, and pedestal ...
BACKGROUND Agricultural workers are exposed to airborne pollutants, including organic and inorganic (mineral) dusts. OBJECTIVES Lung autopsy specimens from consecutive coroner's cases of Hispanic males in Fresno County, California, (n = 112) were obtained to determine whether mineral dust exposure in agricultural work leads to pneumoconiosis. METHODS The left lung was fixed by inflation. We...
Abstract The objective of this study is to experimentally evaluate a new acid combination HEDP: CH 3 COOH as retarded minimize some limitations high-temperature sandstone acidizing, such fast acid-rock reaction and secondary precipitation pipeline corrosion. In work, the acid–base titration, core-powder solubility test, scale deposition corrosion rate measurement corefloods were carried out per...
OBJECTIVE High-resolution MRI methods have been used to evaluate carotid artery atherosclerotic plaque content. The purpose of this study was to assess the performance of high-resolution MRI in evaluation of the quantity and pattern of mineral deposition in carotid endarterectomy (CEA) specimens, with quantitative micro-CT as the gold standard. METHODS AND RESULTS High-resolution MRI and CT w...
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