6,368 research outputs found
Pairs-Production of Higgs in Association with Bottom Quarks Pairs at Colliders
In a previous paper, we studied the Higgs pair production in the standard
model with the reaction . Based on this, we study
the Higgs pair production via . We evaluate the
total cross section of and calculate the number total of events
considering the complete set of Feynman diagrams at tree-level, and compare
this process with the process . The numerical
computation is done for the energy which is expected to be available at a
possible Next Linear Collider with a center-of-mass energy and luminosity 1000 .Comment: 12 pages, 6 figure
Aspectos de los sistemas tributarios en los países andinos que preocupan a los inversionistas extranjeros
Estamos complacidos con la oportunidad que nos brinda el Banco Interamericano de Desarrollo de compartir, con los protagonistas del desarrollo e integración económica en los países de la Comunidad Andina de Naciones, algunos de los aspectos de sus sistemas tributarios que en nuestra experiencia generan ciertos problemas a las empresas multinacionales desarrollando negocios en estas jurisdicciones.Política fiscal, Sistemas tributarios, países Andinos, Inversionistas
Corporate governance facing corporate social responsability: solving challenges in the 21st century
17 páginasWithin the context of modern Corporate Governance and particularly in the aftermath of the
financial scandals of the XXIst Century, companies, regulators, markets and the public in
general claim for more transparency, accountability, shareholders and investor protection.
There is also a trend towards reinforcing the Responsibility of Companies towards the
Communities in which they develop their businesses. However, generally speaking
shareholders do not have a direct control nor saying in management; and stakeholders
possibility of influencing corporations’ decisions seems very rare. This article reviews some
of the existing corporate cultural and legal systems and provides ideas for future development
of corporate Governance in de field of Share- and Interest- -Holders’ protectionS
LCG Service Challenge 3 at the Spanish Tier-1 and Tier-2 sites
This note describes the participation of the Spanish centres PIC and CIEMAT in the LCG Service Challenge 3 as Tier-1 and Tier-2 sites respectively. Data transfer, job submission and data throughput from mass storage to the data processing jobs have been successfully exercised at the desired level. Very valuable experience has been gained running the complex computing system under realistic conditions at a signi cant scale
The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions Along the Jet Axis
The triple radio source detected in association with the luminous infrared
source IRAS 16547-4247 has previously been studied with high angular resolution
and high sensitivity with the Very Large Array (VLA) at 3.6-cm wavelength. In
this paper, we present new 3.6 cm observations taken 2.68 years after the first
epoch that allow a search for variability and proper motions, as well as the
detection of additional faint sources in the region. We do not detect proper
motions along the axis of the outflow in the outer lobes of this source at a
4- upper limit of 160 km s. This suggests that these lobes
are probably working surfaces where the jet is interacting with a denser
medium. However, the brightest components of the lobes show evidence of
precession, at a rate of yr clockwise in the plane of
the sky. It may be possible to understand the distribution of almost all the
identified sources as the result of ejecta from a precessing jet. The core of
the thermal jet shows significant variations in flux density and morphology. We
compare this source with other jets in low and high mass young stars and
suggest that the former can be understood as a scaled-up version of the latter.Comment: 26 pages, 9 figure
An ABS Recycled Coating for Corrosion Protection and Conservation of Copper and Alloys of Cultural or Historic Value
Diseño de investigación del estudio de caso de la Asociación PIDES. Una mirada desde las ecologías del aprendizaje y la educación expandida.
The Rotating Molecular Structures and the Ionized Outflow Associated with IRAS 16547-4247
We present VLA 1.3 cm radio continuum and water maser observations as well as
SMA SO (226.300 GHz) and 1.3 mm dust continuum observations toward the
massive star formation region IRAS 16547-4247. We find evidence of multiple
sources in the central part of the region. There is evidence of a rotating
structure associated with the most massive of these sources, traced at small
scales (~50 AU) by the water masers. At large scales (~1000 AU) we find a
velocity gradient in the SO2 molecular emission with a barely resolved
structure that can be modeled as a rotating ring or two separate objects. The
velocity gradients of the masers and of the molecular emission have the same
sense and may trace the same structure at different size scales. The position
angles of the structures associated with the velocity gradients are roughly
perpendicular to the outflow axis observed in radio continuum and several
molecular tracers. We estimate the mass of the most massive central source to
be around 30 solar masses from the velocity gradient in the water maser
emission. The main source of error in this estimate is the radius of the
rotating structure. We also find water masers that are associated with the
large scale molecular outflow of the system, as well as water masers that are
associated with other sources in the region. Our results suggest that the
formation of this source, one of the most luminous protostars or protostellar
clusters known, is taking place with the presence of ionized jets and disk-like
structures.Comment: 26 pages, 7 figure
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