نتایج جستجو برای: rare metals

تعداد نتایج: 301425  

2008
René M. Price Peter K. Swart Hugh E. Willoughby

a Florida International University, Department of Earth Sciences and Southeast Environmental Research Center, Miami, FL 33199, United States b Rosenstiel School of Marine and Atmospheric Sciences, 4600 Rickenbacker Causeway, Division of Marine Geology and Geophysics, University of Miami, Miami, FL 33149, United States c Florida International University, Department of Earth Sciences, Miami, FL 3...

Journal: :Polarforschung 1988
J R Vestal

Primary production in the Antarctic cryptoendolithic microbiota can be determined from biomass and photosynthetic 14CO2 incorporation measurements. Even though good nanoclimate data are available, it is difficult to determine the amount of time when abiotic conditions permit metabolism. Making appropriate assumptions concerning the metabolism of the cryptoendolithic microbiota during periods ...

2017
Benjamin Sprecher Ichiro Daigo Wouter Spekkink Matthijs Vos René Kleijn Shinsuke Murakami Gert Jan Kramer

We introduce several new resilience metrics for quantifying the resilience of critical material supply chains to disruptions and validate these metrics using the 2010 rare earth element (REE) crisis as a case study. Our method is a novel application of Event Sequence Analysis, supplemented with interviews of actors across the entire supply chain. We discuss resilience mechanisms in quantitative...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2012
Vadim B Warshavsky Xueyu Song

A perturbation theory is used to calculate bcc solid-liquid interfacial free energies of metallic systems with embedded-atom model potentials. As a reference system for bcc crystals we used a single-occupancy cell, hard-sphere bcc system. Good agreements between the perturbation theory results and the corresponding results from simulations are found. The strategy to extract hard-sphere bcc soli...

Journal: :Journal of Chemical Education 1956

Journal: :The journal of physical chemistry. A 2006
Dustin S Ho Nathan J DeYonker Angela K Wilson Thomas R Cundari

Computing the enthalpies of formation for alkali metal and alkaline earth metal oxides (M(x)O) and hydroxides [M(OH)(n)] using the Gaussian-n (Gn) and Weismann-n (Wn) ab initio model chemistries is difficult due to an improper treatment of core-valence electron correlation effects. Using a new model chemistry called the correlation consistent Composite Approach (ccCA), enthalpies of formation w...

2007
Garth W. Griffith Gary L. Easton Andrew Detheridge Kevin Roderick Arwyn Edwards Hilary J. Worgan Jean Nicholson William T. Perkins Nina Gunde-Cimerman

Copperde¢ciency in potatodextroseagar causes reduced pigmentation in culturesof variousfungi Garth W. Griffith, Gary L. Easton, Andrew Detheridge, Kevin Roderick, Arwyn Edwards, Hilary J. Worgan, Jean Nicholson & William T. Perkins Institute of Biological Sciences, Aberystwyth University, Penglais, Aberystwyth, Ceredigion, Wales, UK; and Institute of Geography and Earth Sciences, Aberystwyth Un...

2011
R. H. Macedo

The perpetuation of life on planet Earth is presently threatened by innumerable pressures derived from human activities. As we strive to predict and control the damages humans continue to inflict upon the Earth, a key factor that will prove immeasurably valuable is knowledge about the various forms of life, including where and how they live. The word “science” is derived from the Latin verb “sc...

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