نتایج جستجو برای: limestone quarries

تعداد نتایج: 6283  

Journal: :Transactions of the Geological Society of Glasgow 1888

Journal: :Journal of biomedical informatics 2014
Joyce C. Ho Joydeep Ghosh Steven R. Steinhubl Walter F. Stewart Joshua C. Denny Bradley Malin Jimeng Sun

The rapidly increasing availability of electronic health records (EHRs) from multiple heterogeneous sources has spearheaded the adoption of data-driven approaches for improved clinical research, decision making, prognosis, and patient management. Unfortunately, EHR data do not always directly and reliably map to medical concepts that clinical researchers need or use. Some recent studies have fo...

2009
S. R. Rust

Story in Brief Two levels oflimestone (.7 and 2.0 percent) were fed with two levels of chopped alfalfa hay (10 and 50 percent) to 22 Hereford steers (517 lb). The diet also contained whole shelled corn and supplement. Animals were fed individually at a level equal to 2.5 percent of body weight daily in two equal meals. Organic matter, fiber and nitrogen digestibility were increased with added l...

2006
C. K. BAKER

Small-scale assimilation of limestone during the intrusion of an olivine basalt feeder dyke into an Eocene argillaceous, siliceous biomicrite in the Tokatoka area has resulted in the incorporation of large amounts of calcium into the parent magma. Initial effects of assimilation have caused partial resorption of the earlyformed igneous mineralogy and the precipitation of calcic, iron-rich clino...

2017
Sungchan Oh Chang-Uk Hyun Hyeong-Dong Park

Quantitative analysis of CaO in limestone mining is mandatory, not only for ore exploration, but also for grade control. A partial least squares regression (PLSR) CaO estimation technique was developed for limestone mining. The proposed near-infrared spectroscopy (NIR)-based method uses reflectance spectra of the rock sample surface in the visible to short-wave infrared wavelength regions (350–...

Journal: :Journal of animal science 1985
D R Brink R T Steele

Five steers (385 kg) fitted with permanent abomasal cannulae were used to compare Ca source (limestone or dicalcium phosphate) and corn level on site and extent of digestion. Diets contained 50, 70 or 90% corn, with corn silage and supplement to provide .70% Ca from either limestone or dicalcium phosphate. Limestone did not affect ruminal digestion, but postruminal starch and neutral detergent ...

2016
Ali El Hanandeh

The building and construction sector is vital in Jordan. Over the past decade it witnessed rapid growth. Single-family housing is a popular option in Jordan. The construction sector consumes large amounts of energy and resources. Green and energy efficient buildings are growing in popularity and there are policies adopted to encourage energy efficient buildings. These buildings are often justif...

Journal: :Materials and structures 2017
Dale P Bentz Paul E Stutzman Franco Zunino

With the ongoing sustainability movement, the incorporation of limestone powder in cementitious binders for concrete in the U.S. has become a subject of renewed interest. In addition to accelerating the early age hydration reactions of cementitious systems by providing additional surfaces for nucleation and growth of products, limestone powder is also intriguing based on its influence on low-te...

1999
BRADNER D. WHEELER

Calcium carbonate and calcium-magnesium carbonate in the form of limestone, dolomite, marl, chalk, and Oyster shell are one of the most widely utilized non-metallic materials in the industrial world. The largest use of limestone or calcium carbonate is in the cement industry where it is used as a source of CaO and also in the concrete industry where it is used as the primary coarse aggregate. F...

2016
Chloé E. A. Amberg Tim Collart Wout Salenbien Lisa M. Egger Axel Munnecke Arne T. Nielsen Claude Monnet Øyvind Hammer Thijs R. A. Vandenbroucke

Ordovician limestone-marl alternations in the Oslo-Asker District have been interpreted as signaling glacio-eustatic lowstands, which would support a prolonged "Early Palaeozoic Icehouse". However, these rhythmites could alternatively reflect differential diagenesis, without sedimentary trigger. Here, we test both hypotheses through one Darriwilian and three Katian sections. Our methodology con...

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