53 research outputs found
Investigation of structure and hydrogen bonding of super-hydrous phase B (HT) under pressure using first principles density functional calculations
High pressure behaviour of superhydrous phase B(HT) of Mg10Si3O14(OH)4 (Shy
B) is investigated with the help of density functional theory based first
principles calculations. In addition to the lattice parameters and equation of
state, we use these calculations to determine the positional parameters of
atoms as a function of pressure. Our results show that the compression induced
structural changes involve cooperative distortions in the full geometry of the
hydrogen bonds. The bond bending mechanism proposed by Hofmeister et al [1999]
for hydrogen bonds to relieve the heightened repulsion due to short H--H
contacts is not found to be effective in Shy B. The calculated O-H bond
contraction is consistent with the observed blue shift in the stretching
frequency of the hydrogen bond. These results establish that one can use first
principles calculations to obtain reliable insights into the pressure induced
bonding changes of complex minerals.Comment: 16 pages, 4 figure
Transport of water into the lower mantle: Role of stishovite
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95319/1/jgrb13563.pd
Mineralogy and elasticity of the oceanic upper mantle: Origin of the low‐velocity zone
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94924/1/jgrb14078.pd
Relative strength of the pyrope–majorite solid solution and the flow-law of majorite containing garnets
Petrogenetic grid in the system MgO-SiO2-H2O up to 30 GPa, 1600°C:Applications to hydrous peridotite subducting into the Earth's deep interior
Single crystal elasticity of majoritic garnets: Stagnant slabs and thermal anomalies at the base of the transition zone
The features of decision making process in international companies. Are companies in control of their own decisions?
The following article deals with the main causes of irrational decision making process in companies and with respective solutions to make decisions more rational and effective. With the aid of relevant literature, the ways managers, groups and leaders make decisions in reality will be clarified. Besides, the solutions to rational decisions examined through the perspective of managers, leaders and groups. Thus, the background of this article is the question “Are companies in control of their own decisions?” In addition, this paper includes relevant information about the features of decision making process, basic types of decisions, describes the most essential approach in management regarding to decision making and presents the top worst and best business decisions of all time
Decomposition boundary from high-pressure clinoenstatite to wadsleyite + stishovite in MgSiO3
Equations of state of dense hydrous magnesium silicates: results from single-crystal X-ray diffraction
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