10,465 research outputs found
Empathy and Role Modeling. is IT Missing?
Let me start by congratulating the dedicated team of Pakistan Journal of Surgery and Medicine (PJSM) whose untiring effort brought this journal of International standard. I have the honor to be part of this professional and enthusiastic galaxy of highly intellectual writers. Insha'Allah you will witness the glory of this journal very soon
"Real Exchange Rates and the International Mobility of Capital"
This paper demonstrates that the terms of trade are determined by the equalization of profit rates across international regulating capitals, for socially determined national real wages. This provides a classical/Marxian basis for the explanation of real exchange rates, based on the same principle of absolute cost advantage which rules national prices. Large international flows of direct investment are not necessary for this result, since the international mobility of financial capital is sufficient. Such a determination of the terms of trade implies that international trade will generally give rise to persistent structural trade imbalances covered by endogenously generated capital flows which will fill any existing gaps in the overall balance of payments. It also implies that devaluations will not have a lasting effect on trade balances, unless they are also attended by fundamental changes in national real wages or productivities. Finally, it implies that neither the absolute nor the relative version of the Purchasing Power Parity hypothesis (PPP) will generally hold, with the exception that the relative version of PPP will appear to hold when a country experiences a relatively high inflation rate. Such patterns are well documented, and in contrast to comparative advantage or PPP theory, the present approach implies that the existing historical record is perfectly coherent. Empirical tests of the propositions advanced in this paper have been conducted elsewhere, with good results.
DFT based study on structural stability and transport properties of Sr3AsN: A potential thermoelectric material
Antiperovskite materials are well known for their high thermoelectric
performance and gained huge research interest. Here, we report the structural
stability and transport properties of SrAsN from a precise first-principles
study. The calculated equilibrium lattice parameters are in a good agreement
with the available data. We find that SrAsN is a mechanically,
energetically and dynamically stable at ambient condition. Our calculated
electronic structure indicates that it is a direct bandgap semiconductor, with
a value ~1.2 eV. Sr-4d and N-2p orbitals mainly formulate the direct bandgap.
This antiperovskite possesses a high Seebeck coefficient. Although its lattice
thermal conductivity is comparatively low, electronic thermal conductivity is
very high. The calculated maximum TE figure of merit is 0.75 at 700 K,
indicating that it is a potential material for thermoelectric applications.Comment: 22 pages, 11 figure
High Seebeck coefficient and ultra-low lattice thermal conductivity in Cs2InAgCl6
The elastic, electronic and thermoelectric properties of indium-based
double-perovskite halide, Cs2InAgCl6 have been studied by first principles
study. The Cs2InAgCl6 is found to be elastically stable, ductile, anisotropic
and relatively low hard material. The calculated direct bandgap 3.67 eV by
TB-mBJ functional fairly agrees with the experimentally measured value 3.3 eV
but PBE functional underestimates the bandgap by 1.483 eV. The relaxation time
and lattice thermal conductivity have been calculated by using relaxation time
approximation (RTA) within the supercell approach. The lattice thermal
conductivity (\k{appa}l) is quite low (0.2 Wm-1K-1). The quite low phonon group
velocity in the large weighted phase space, and high anharmonicity (large
phonon scattering) are responsible for small \k{appa}l. The room temperature
Seebeck coefficient is 199 {\mu}VK-1. Such high Seebeck coefficient arises from
the combination of the flat conduction band and large bandgap. We obtain power
factors at 300K by using PBE and TB-mBJ potentials are ~29 and ~31 mWm-1K-2,
respectively and the corresponding thermoelectric figure of merit of Cs2BiAgCl6
are 0.71 and 0.72. However, the maximum ZT value obtained at 700K is ~0.74 by
TB-mBJ potential. The obtained results implies that Cs2InAgCl6 is a promising
material for thermoelectric device applications.Comment: 19 pages. arXiv admin note: text overlap with arXiv:1801.0370
On certain equations of arbitrary length over torsion-free groups
Let be a non-trivial torsion free group and be an unknown. In this
paper we consider three equations (over ) of arbitrary length and show that
they have a solution (over ) provided two relations among their coefficients
hold. Such equations appear for all lengths greater than or equal to eight and
the results presented in this article can substantially simplify their
solution.Comment: arXiv admin note: substantial text overlap with arXiv:1903.0650
Bounds on R-parity violating SUSY Yukawa couplings from semileptonic decays of baryons
We consider tree-level corrections to hypercharge changing semileptonic
decays of certain baryons induced by a minimal supersymmetric standard model
with explicitly broken R-parity via -violation. This study leads to a new
set of constraints on the products of couplings arising from the LQd
operator of the superpotential.Comment: Latex (8 pages), no figur
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