3,276 research outputs found
Vortex Creep Against Toroidal Flux Lines, Crustal Entrainment, and Pulsar Glitches
A region of toroidally oriented quantized flux lines must exist in the proton
superconductor in the core of the neutron star. This region will be a site of
vortex pinning and creep. Entrainment of the neutron superfluid with the
crustal lattice leads to a requirement of superfluid moment of inertia
associated with vortex creep in excess of the available crustal moment of
inertia. This will effect constraints on the equation of state. The toroidal
flux region provides the moment of inertia necessary to complement the crust
superfluid with postglitch relaxation behavior fitting the observations.Comment: Published in The Astrophysical Journal Letter
Trade Taxes Are Expensive
This paper examines the welfare implications of trade reforms in the presence of a government budget constraint. There is consensus about gains from opening up to trade. The less investigated question is, whether a coordinated tax reform, where the tariff revenue cuts are compensated with increases in distortionary domestic taxes, will still be welfare improving or not. Are trade taxes an expensive tool to raise the necessary revenue for governments? This paper uses a CGE model to generate “Marginal Cost of Funds” (MCF) figures for 32 countries to answer this question. The results suggest that there are significant welfare gains from further trade liberalization, especially for developing countries.Trade Liberalization, Tax Reform, Welfare Gain, Marginal Cost of Funds (MCF), Computable General Equilibrium Model (CGE)
Peculiar Glitch of PSR J1119-6127 and Extension of the Vortex Creep Model
Glitches are sudden changes in rotation frequency and spin-down rate,
observed from pulsars of all ages. Standard glitches are characterized by a
positive step in angular velocity ( ) and a negative
step in the spin-down rate ( ) of the pulsar.
There are no glitch-associated changes in the electromagnetic signature of
rotation-powered pulsars in all cases so far. For the first time, in the last
glitch of PSR J1119-6127, there is clear evidence for changing emission
properties coincident with the glitch. This glitch is also unusual in its
signature. Further, the absolute value of the spin-down rate actually decreases
in the long term. This is in contrast to usual glitch behaviour. In this paper
we extend the vortex creep model in order to take into account these
peculiarities. We propose that a starquake with crustal plate movement towards
the rotational poles of the star induces inward vortex motion which causes the
unusual glitch signature. The component of the magnetic field perpendicular to
the rotation axis will decrease, giving rise to a permanent change in the
pulsar external torque.Comment: accepted by MNRAS, 10 pages, 2 figure
Microscopic Vortex Velocity in the Inner Crust and Outer Core of Neutron Stars
Treatment of the vortex motion in the superfluids of the inner crust and the
outer core of neutron stars is a key ingredient in modeling a number of pulsar
phenomena, including glitches and magnetic field evolution. After recalculating
the microscopic vortex velocity in the inner crust, we evaluate the velocity
for the vortices in the outer core for the first time. The vortex motion
between pinning sites is found to be substantially faster in the inner crust
than in the outer core, v_0^{\rm crust} \sim 10^{7}\mbox{\cms} \gg v_0^{\rm
core} \sim 1\mbox{\cms}. One immediate result is that vortex creep is always
in the nonlinear regime in the outer core in contrast to the inner crust, where
both nonlinear and linear regimes of vortex creep are possible. Other
implications for pulsar glitches and magnetic field evolution are also
presented.Comment: Accepted for publication in MNRA
Revealing Turkey’s Public Debt Burden: A Transparent Payments Approach
We postulate a new method of identifying debt which we call Debt Burden (DB). We claim that DB reveals the true debt obligations of the fiscal authority. It is more accurate and transparent. Hence, DB would serve fiscal authority much better in policy making. It is powerful in a sense that it is calculated on a daily basis and can serve as a good policy measure since it includes projections into the future.Debt burden, public debt, Turkey
A study on technology management process: the parts and components suppliers in the Turkish automotive industry
This paper summarizes part of an empirical study on technology management process in the Turkish automotive parts and components industry. In this study, technology management practices in the Turkish automotive parts and components suppliers' sector are described and evaluated. Practices, techniques, and approaches are proposed to improve the level of technology management so as to turn technology into a competitive weapon. The investigation is organized within the framework of a process model for technology management that consists of technology identification, selection, acquisition, exploitation, protection, and abandonment. A comprehensive questionnaire addressing all phases of this process is developed and the results of 21 companies are presented
Kutsal aile
Taha Toros Arşivi, Dosya No: 67-Leyla ErbilUnutma İstanbul projesi İstanbul Kalkınma Ajansı'nın 2016 yılı "Yenilikçi ve Yaratıcı İstanbul Mali Destek Programı" kapsamında desteklenmiştir. Proje No: TR10/16/YNY/010
- …