1,040,938 research outputs found
Arena
Newsletter of the Boston University School of Medicine, Student American Medical Association (SAMA
Arena
Newsletter of the Boston University School of Medicine, Student American Medical Association (SAMA
Reconstructions of a Republic. The political culture of ancient Rome and the research of the last decade.
Review of (K. J.) HΓΆlkeskamp Rekonstruktionen einer Republik. Die politische Kultur des antiken Rom und die Forschung der letzten Jahrzehnte (Historische Zeitschrift Beiheft 38). Pp. 146. Munich: R. Oldenbourg Verlag, 2004. ISBN: 3-486-64439-4
Review of E. Narducci 'Cicerone Prospettiva 2000. Atti del I Symposium Ciceronianum Arpinas. Arpino 5 Maggio 2000'
Cicerone Prospettiva 2000. Atti del I Symposium Ciceronianum Arpinas. Arpino 5 Maggio 2000 ; Interpretare Cicerone. Percorsi della critica contemporanea. Atti del II Symposium Ciceronianum Arpinas. Arpino 18 Maggio 2001 by E. Narducci
Review by: Valentina Aren
Spacetime: Arena or Reality?
For small values of the mass (in relation to the angular momentum and
electric charge), the Kerr-Newman (KN) solution of Einstein equation reduces to
a naked singularity of circular shape. By considering the Hawking and Ellis
extended interpretation of the KN spacetime, as well as Wheeler's idea of
"charge without charge", the non-trivial topological structure of the extended
KN spatial section is found to represent gravitational states with
half-integral angular momentum. As a consequence, it can be consistently
interpreted as a model for the electron-positron system, in which the concepts
of mass, charge and spin emerge from the spacetime geometry. According to this
model, therefore, instead of a simple arena, spacetime must have a concrete
existence, being responsible -- through its highly non-trivial topological
structures -- for the building blocks of (at least some of) the existing matter
in the universe.Comment: Chapter in the book "Relativity and the Dimensionality of the World",
Springer series "Fundamental Theories of Physics", Vol. 153 (2007). Volume
Editor: Vesselin Petko
Libertas ΠΈ ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ Π² ΠΏΠΎΠ·Π΄Π½Π΅ΠΉ Π ΠΈΠΌΡΠΊΠΎΠΉ ΡΠ΅ΡΠΏΡΠ±Π»ΠΈΠΊΠ΅
ΠΠ°Π½Π½Π°Ρ ΠΌΠΎΠ½ΠΎΠ³ΡΠ°ΡΠΈΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅Ρ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΈΠ΄Π΅ΠΈ ΠΎ libertas ΠΈ Π΅Π΅ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²ΠΎΠΏΠ»ΠΎΡΠ΅Π½ΠΈΡ Π² ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±ΠΎΡΡΠ±Π΅ ΠΏΠ΅ΡΠΈΠΎΠ΄Π° ΠΏΠΎΠ·Π΄Π½Π΅ΠΉ Π ΠΈΠΌΡΠΊΠΎΠΉ ΡΠ΅ΡΠΏΡΠ±Π»ΠΈΠΊΠΈ. Π Π΅ΠΊΠΎΠ½ΡΡΡΡΠΈΡΡΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠΈΠΌΠ»ΡΠ½ ΠΎ libertas Π½Π° ΡΠΎΠ½Π΅ Π°Π½Π°Π»ΠΎΠ³ΠΈΡΠ½ΡΡ
ΠΊΠΎΠ½ΡΠ΅ΠΏΡΠΎΠ² Π² ΠΊΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΡΡ ΠΈ ΡΠ»Π»ΠΈΠ½ΠΈΡΡΠΈΡΠ΅ΡΠΊΡΡ ΡΠΏΠΎΡ
ΠΈ, Π°Π²ΡΠΎΡ ΡΡΠ°ΡΠ°Π΅ΡΡΡ ΠΏΠ΅ΡΠ΅ΠΎΡΠΌΡΡΠ»ΠΈΡΡ ΡΡΡΠ½ΠΎΡΡΡ ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π±ΠΎΡΡΠ±Ρ Π² ΠΏΠΎΠ·Π΄Π½Π΅ΠΉ Π ΠΈΠΌΡΠΊΠΎΠΉ ΡΠ΅ΡΠΏΡΠ±Π»ΠΈΠΊΠ΅ ΠΈ ΡΡ ΡΠΎΠ»Ρ, ΠΊΠΎΡΠΎΡΡΡ ΠΈΠ³ΡΠ°Π»ΠΎ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠΈΠΌΠ»ΡΠ½ ΠΎ libertas Π² ΡΠΎΠ³Π΄Π°ΡΠ½ΠΈΡ
ΠΏΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡΡ
.ΠΠΎΠ½ΠΎΠ³ΡΠ°ΡΠΈΡ Π²ΠΊΠ»ΡΡΠ°Π΅Ρ ΡΠΊΠ°Π·Π°ΡΠ΅Π»Ρ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² (c. 312-318) ΠΈ ΠΎΠ±ΡΠΈΠΉ ΡΠΊΠ°Π·Π°ΡΠ΅Π»Ρ (c. 319-324)
(WP 2012-01) Territorial Tax System Reform and Corporate Financial Policies
We examine the effect of a permanent change to a country income repatriation tax system on a set of corporate financial policies. In 2009 Japan and UK switched from a worldwide system to a territorial system for the taxation of earnings repatriated by their multinational firms. Due to the relatively high corporate tax rate in Japan and UK, the new system effectively reduced the tax liabilities of most multinational firms when repatriating earnings. We find that after the change Japanese and UK firms accumulate less cash, pay out larger amounts to shareholders through dividends and share repurchases, and invest less abroad. We do not find that the tax system change has significantly affected corporate domestic investments
Firm Location and Corporate Debt
This study examines the influence of a firmβs geographical location on corporate debt and provides evidence that the higher cost of collecting information on firms distant from urban areas has significant implications on a wide array of corporate debt characteristics. We find that rural firms face higher debt yield spreads and attract smaller and less prestigious bank syndicates than urban firms. Rural firms attempt to reduce their informational disadvantage by relying more on relationship banking. Our results on the effect of location on corporate debt are robust to the inclusion of an extensive set of firm and issue characteristics
The Non-Monetary Value of Reparations Rhetoric
I have several comments to offer on the subject of reparations. Reparations is not a single idea. The forty acres and a mule that General Sherman promised to the slaves was the beginning of the idea of reparations in America, but not the end. Reparations is a multi-part idea; until we get that straight, we are vulnerable to the feeling that we are lost again. There are at least three arenas in which the reparations issue may be contested. One is the political arena. In the arena of legislation and political maneuvering, bills must be submitted for majoritarian acceptance. It is no surprise that the current reparations bill has not gained the majority acceptance necessary for success. Thus, success in the political arena requires personal and collective political activism. The second arena is legal. In this arena those wronged can bring lawsuits. There is a coalition currently working on these lawsuits. As a lawyer, I must confess that the legal arena is probably less promising than the political arena. Although several legal precedents serve as barriers standing in the way of success in the courts, lawsuits are not, however, without value. One must simply understand their limited value. Lawsuits create the platform for the third, most important and powerful arena: the intellectual challenge to the history of racism. This arena allows us to challenge, to document, to read alternative stories, and to give those stories to our children-stories that help reposition Blacks from economic parasites to economic contributors unfairly deprived of their wealth. The intellectual arena provides an important strategic difference. When we address tired debates such as whether affirmative action is reverse discrimination, a different perspective emerges; reparations offers that positioning. Reparations as an intellectual project is most promising because it engages us all and gives us an opportunity to challenge the idea of racism - to challenge it as an idea that governs the way goods are distributed in society
Characterisation of global flow and local fluctuations in 3D SPH simulations of protoplanetary discs
A complete and detailed knowledge of the structure of the gaseous component
in protoplanetary discs is essential to the study of dust evolution during the
early phases of pre-planetesimal formation. The aim of this paper is to
determine if three-dimensional accretion discs simulated by the Smoothed
Particle Hydrodynamics (SPH) method can reproduce the observational data now
available and the expected turbulent nature of protoplanetary discs. The
investigation is carried out by setting up a suite of diagnostic tools
specifically designed to characterise both the global flow and the fluctuations
of the gaseous disc. The main result concerns the role of the artificial
viscosity implementation in the SPH method: in addition to the already known
ability of SPH artificial viscosity to mimic a physical-like viscosity under
specific conditions, we show how the same artificial viscosity prescription
behaves like an implicit turbulence model. In fact, we identify a threshold for
the parameters in the standard artificial viscosity above which SPH disc models
present a cascade in the power spectrum of velocity fluctuations, turbulent
diffusion and a mass accretion rate of the same order of magnitude as measured
in observations. Furthermore, the turbulence properties observed locally in SPH
disc models are accompanied by meridional circulation in the global flow of the
gas, proving that the two mechanisms can coexist.Comment: Accepted for publication in Monthly Notices of the Royal Astronomical
Society. 21 pages, 25 figure
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