نتایج جستجو برای: c44
تعداد نتایج: 247 فیلتر نتایج به سال:
The Verwey phase transition in magnetite is analyzed on the basis of the Landau theory. The free energy functional is expanded in a series of components belonging to the primary and secondary order parameters. A low-temperature phase with the monoclinic P2/c symmetry is a result of condensation of two order parameters X3 and ∆5. The temperature dependence of the shear elastic constant C44 is de...
We study selection contests in which the strategic variable is the degree of risk rather than the amount of effort. The selection efficiency of such contests is examined. We show that the selection efficiency of a contest may be improved by limiting the competition in two ways; a) by having a small number of contestants, and b) by restricting contestant quality. JEL Classification: C44, D29, D8...
The objective of this study is to provide an alternative characterization of the optimal value function of a certain BlackScholes-type optimal stopping problem where the underlying stochastic process is a general random walk, i.e. the process constituted by partial sums of an IID sequence of random variables. Furthermore, the pasting principle of this optimal stopping problem is studied. JEL Cl...
The electronic structure of small fullerenes determined experimentally by anion photoelectron spectroscopy is compared with calculations. A huge mass signal and a large gap of 1.3 eV comparable to the gap of C70 have been found for C32, indicating that this cluster is the most stable fullerene below C60. Also C36, C44, and C50 exhibit large gaps and surprisingly high stabilities. The criteria f...
Recent experiments have shown that the shear modulus of solid helium undergoes a large temperature variation in the range 20 to 200 mK, possibly due to changes in the pinning of dislocations. In this note we report on computer simulations of the elastic properties of polycrystalline solid helium. We calculate how the elastic coefficients of a sample made up of a large number of randomly oriente...
A theoretical study on structural, electronic and elastic properties of cubic ScIn3 intermetallic, which crystallizes in AuCu3 structure, have been investigate during full-potential linearized augmented plane wave (FP-LAPW) method within the framework of density functional theory. The generalized gradient approximation and local density approximation is used for exchange-correlation (XC) potent...
Metabolomic discovery of biomarkers of type 2 diabetes (T2D) risk may reveal etiological pathways and help to identify individuals at risk for disease. We prospectively investigated the association between serum metabolites measured by targeted metabolomics and risk of T2D in the European Prospective Investigation into Cancer and Nutrition (EPIC)-Potsdam (27,548 adults) among all incident cases...
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