1,629 research outputs found
A Monopole Near a Black Hole
We study an electric charge held at rest outside a magnetically charged black
hole. We find that even if the electric charge is treated as a perturbation on
a spherically symmetric magnetic Reissner-Nordstrom hole, the geometry at large
distances is that of a magnetic Kerr-Newman black hole. When the charge
approaches the horizon and crosses it, the exterior geometry becomes that of a
Kerr-Newman hole with electric and magnetic charges and with total angular
momentum given by the standard value for a charged monopole pair. Thus, in
accordance with the "no-hair theorem", once the charge is captured by the black
hole, the angular momentum associated with the charge monopole system, looses
all traces of its exotic origin and it is perceived from the outside as common
rotation. It is argued that a similar analysis performed on Taub-NUT space
should give the same result, namely, if one holds an ordinary mass outside of
the horizon of a Taub-NUT space with only magnetic mass, the system, as seen
from large distances, is endowed with an angular momentum proportional to the
product of the two kinds of masses. When the ordinary, electric, mass reaches
the horizon, the exterior metric becomes that of a rotating Taub-NUT space.Comment: 8 pages. References adde
Commissioning and First Observations with Wide FastCam at the Telescopio Carlos S\'anchez
The FastCam instrument platform, jointly developed by the IAC and the UPCT,
allows, in real-time, acquisition, selection and storage of images with a
resolution that reaches the diffraction limit of medium-sized telescopes.
FastCam incorporates a specially designed software package to analyse series of
tens of thousands of images in parallel with the data acquisition at the
telescope. Wide FastCam is a new instrument that, using the same software for
data acquisition, does not look for lucky imaging but fast observations in a
much larger field of view. Here we describe the commissioning process and first
observations with Wide FastCam at the Telescopio Carlos S\'anchez (TCS) in the
Observatorio del Teide.Comment: 7 pages, 8 figures, Proc. SPIE. 9908, Ground-based and Airborne
Instrumentation for Astronomy VI, 99082O. (August 09, 2016
From Lyapunov modes to the exponents for hard disk systems
We demonstrate the preservation of the Lyapunov modes by the underlying
tangent space dynamics of hard disks.
This result is exact for the zero modes and correct to order for
the transverse and LP modes where is linear in the mode number.
For sufficiently large mode numbers the dynamics no longer preserves the mode
structure.
We propose a Gram-Schmidt procedure based on orthogonality with respect to
the centre space that determines the values of the Lyapunov exponents for the
modes.
This assumes a detailed knowledge of the modes, but from that predicts the
values of the exponents from the modes.
Thus the modes and the exponents contain the same information
Evaporative cooling systems to improve internal comfort in industrial buildings
Several studies were carried out to determine how hot or cold environments can affect task performance and can influence productivity. Usually, HVAC plants are exactly designed in order to guarantee comfortable internal conditions inside built environments, but not all kind of buildings are equipped with a heating or cooling plant, like for example, some industrial buildings. These buildings are often characterized by high internal thermal loads. For those buildings the ability of different plant configurations to improve indoor thermal conditions was considered taking into account the influence of several parameters, like weather conditions, internal gains, thermal transmittance, ventilation air flow rate, etc. Simulation results are compared in terms of energy savings and thermal comfort. \ua9 2017 The Author(s)
Interprofessional education about patient decision support in specialty care
Specialty care involves services provided by health professionals who focus on treating diseases affecting one body system. In contrast to primary care - aimed at providing continuous, comprehensive care - specialty care often involves intermittent episodes of care focused around specific medical conditions. In addition, it typically includes multiple providers who have unique areas of expertise that are important in supporting patients' care. Interprofessional care involves multiple professionals from different disciplines collaborating to provide an integrated approach to patient care. For patients to experience continuity of care across interprofessional providers, providers need to communicate and maintain a shared sense of responsibility to their patients. In this article, we describe challenges inherent in providing interprofessional patient decision support in specialty care. We propose ways for providers to engage in interprofessional decision support and discuss promising approaches to teaching an interprofessional decision support to specialty care providers. Additional evaluation and empirical research are required before further recommendations can be made about education for interprofessional decision support in specialty care.Medical Decision MakingAnalysis and support of clinical decision makin
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