13,413 research outputs found
Regulation of the mitochondrial transition pore : impact on mammalian aging
Commentary on: Hafner AV et al. Regulation of the mPTP by SIRT3-mediated deacetylation of CypD at lysine 166 suppresses age-related cardiac hypertrophy. Aging. 2010; 12:914-923
The Contributions of Two Eminent Japanese Scholars on the Development of Economic Theories: Michio Morishima and Takashi Negishi
There can be no doubt that Michio Morishima and Takashi Negishi are two of the most important historians of economic thought of the recent past. Both authors contributed numerous papers and books to the subject, dealing with the works of major economists from the very inception of systematic economic thought at the time of the classical economists up until modern times. And both authors combined a vivid interest in modern economic theory with an interest in what past masters had to say. The paper assesses and compares the motivations of the two authors to engage in the history of economic theories, their similar, but different approaches to do historical research, and their achievements in this regard. Given the remarkable amount of work each one of them accomplished, the paper has to focus attention on a subset of the themes the two authors dealt with. The emphasis will be on (i) their treatment of the classical theories of value, distribution and capital accumulation, especially those of Adam Smith and David Ricardo, (ii) their discussion of the contributions of Karl Marx and some Marxists, (iii) their interpretation of some early and mature marginalist economists, especially Léon Walras, Eugen von Böhm-Bawerk and Knut Wicksell, and (iv) their views about the achievements of John Maynard Keynes. Given the intrinsic complexity of each of these themes, it goes without saying that the paper is bound to proceed largely in terms of synthetic statements.Negishi, Takashi; Morishima, Michio; general equilibrium; Marxist economics; trade; growth
The Beat of the Economic Heart: Joseph Schumpeter and Arthur Spiethoff on Business Cycles
The paper discusses the relationship between Arthur Spiethoff and Joseph A. Schumpeter, the men and their works. Had it not been for Spiethoff Schumpeter would in all probability have forever been lost to scientific work. It was Spiethoff who brought the Austrian back to academia and research after a sequence of serious mishaps in politics and banking. Spiethoff's contribution to an analysis of business cycles is then summarized and important similarities and some differences between it and Schumpeter's are pointed out. The view of Spiethoff and Schumpeter that cycles are endogenous and cannot possibly be eliminated without at the same time eliminating the dynamism of the capitalist economy is then couterposed with views of some of their contemporaries and particularly modern mainstream macroeconomics that this is not so.Schumpeter; Spiethoff; business cycles; innovations; creative destruction
Jet trails and Mach cones: The interaction of microquasars with the ISM
A sub-set of microquasars exhibit high peculiar velocity with respect to the
local standard of rest due to the kicks they receive when being born in
supernovae. The interaction between the radio plasma released by microquasar
jets from such high-velocity binaries with the ISM must lead to the production
of trails and bow shocks similar to what is observed in narrow-angle tailed
radio galaxies and pulsar wind nebulae. We present a set of numerical
simulations of this interaction that illuminate the long term dynamical
evolution and the observational properties of these microquasar bow shock
nebulae and trails. We find that this interaction always produces a structure
that consists of a bow shock, a trailing neck, and an expanding bubble. Using
our simulations to model emission, we predict that the shock surrounding the
bubble and the neck should be visible in H{\alpha} emission, the interior of
the bubble should be visible in synchrotron radio emission, and only the bow
shock is likely to be detectable in X-ray emission. We construct an analytic
model for the evolution of the neck and bubble shape and compare this model
with observations of X-ray binary SAX J1712.6-3739.Comment: 33 pages, 13 figures, 1 table; Accepted to Ap
In Favor of Rigor and Relevance. A Reply to Mark Blaug
The paper discusses Mark Blaug’s recent criticisms of “Sraffian economics”. It is shown that none of the criticisms stand up to close examination. Blaug commits a number of elementary blunders and mistakes the mathematical form of an argument for its content. He variously contradicts himself and puts forward bold contentions that cannot be sustained. The paper concludes with an obvious plea for rigor and relevance.Piero Sraffa;Mark Blaug; General Equilibrium
Equation of State and Collective Dynamics
This talk summarizes the present status of a program to quantitatively relate
data from the Relativistic Heavy Ion Collider (RHIC) on collective expansion
flow to the Equation of State (EOS) of hot and dense strongly interacting
matter, including the quark-gluon plasma and the quark-hadron phase transition.
The limits reached with the present state of the art and the next steps
required to make further progress will both be discussed.Comment: 8 pages, 6 two-part figures. Invited talk given at the 5th
International Conference on the Physics and Astrophysics of Quark-Gluon
Plasma (ICPAQGP 2005), Kolkata (India), Feb 8-12, 2005. Proceedings to be
published in Journal of Physics: Conference Series (Jan-E Alam et al., eds.
Fluctuations from dissipation in a hot non-Abelian plasma
We consider a transport equation of the Boltzmann-Langevin type for
non-Abelian plasmas close to equilibrium to derive the spectral functions of
the underlying microscopic fluctuations from the entropy. The correlator of the
stochastic source is obtained from the dissipative processes in the plasma.
This approach, based on classical transport theory, exploits the well-known
link between a linearized collision integral, the entropy and the spectral
functions. Applied to the ultra-soft modes of a hot non-Abelian (classical or
quantum) plasma, the resulting spectral functions agree with earlier findings
obtained from the microscopic theory. As a by-product, it follows that
B\"odeker's effective theory is consistent with the fluctuation-dissipation
theorem.Comment: 9 pages, revtex, no figures, identical to published versio
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