نتایج جستجو برای: mineral data
تعداد نتایج: 2466377 فیلتر نتایج به سال:
Automatic mineral identification using evolutionary computation technology is discussed. Thin sections of mineral samples are digitally photographed using a computercontrolled rotating polarizer stage on a petrographic microscope. A suite of image processing functions is applied to the images. Filtered image data for identified mineral grains is then selected for use as training data for a gene...
An understanding of the relationship between chemical structure and lubricant performance is highly desirable from both a fundamental and a practical perspective, such knowledge being vital to improve the performance of mineral oils and to guide the design of future synthetic lubricants. The rheological properties of alkanes of intermediate molecular size (C20–C40) are of particular interest as...
Machine learning methods that have been used in data-driven predictive modeling of mineral prospectivity (e.g., artificial neural networks) invariably require large number of training prospect/locations and are unable to handle missing values in certain evidential data. The Random Forests (RF) algorithm, which is a machine learning method, has recently been applied to data-driven predictive map...
Only limited aspects of the transfer of calcium across the placenta to the fetus are known. Clinical outcome studies suggest that bone mineral mass in newborn infants is related to maternal size and dairy intake. Available data indicate that vitamin D deficiency may also limit in utero fetal bone mineral accumulation. Recent data suggest that maternal vitamin D status affects long-term childhoo...
Air pollution is a consequence of human activities, especially in the period after industrial revolution, which has many (direct and indirect) effects on the human and the environment around him. Among different kinds of pollutions, those related to industries and mines are much more dangerous. Therefore, it is necessary to identify these pollutions and specify them so as to reduce the harmful ...
adopting a policy and deciding on long-term investment in the mining industry by a government orprivate sector actors depends strongly on the ability to predict the scarcity of mineral reserves. changein scarcity of mineral reserves is a function of several technological and non-technological factors.among them, change in technology is the most significant factor affecting scarcity. this paper ...
Background & Aims : Many reports show a relation between exogenous thyroxine therapies on bone mineral density but the net effects remain unclear. The aim of this study was to determine the effect of replacement dose of levothyroxine on bone mineral density in premenopausal women with primary hypothyroidism . Materials & Methods: This study included 50 women with primary hypothyroidism. P...
Previous laboratory and pilot clinical trial data suggest that vitamin and/or mineral supplementation may prevent tumor growth in small cell lung cancer. However, rates of supplementation and their major purported clinical effects have never before been studied in patients with small cell lung cancer. This study was undertaken to explore associations between vitamin/mineral supplementation and ...
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