259 research outputs found
System Synchronizes Recordings from Separated Video Cameras
A system of electronic hardware and software for synchronizing recordings from multiple, physically separated video cameras is being developed, primarily for use in multiple-look-angle video production. The system, the time code used in the system, and the underlying method of synchronization upon which the design of the system is based are denoted generally by the term "Geo-TimeCode(TradeMark)." The system is embodied mostly in compact, lightweight, portable units (see figure) denoted video time-code units (VTUs) - one VTU for each video camera. The system is scalable in that any number of camera recordings can be synchronized. The estimated retail price per unit would be about $350 (in 2006 dollars). The need for this or another synchronization system external to video cameras arises because most video cameras do not include internal means for maintaining synchronization with other video cameras. Unlike prior video-camera-synchronization systems, this system does not depend on continuous cable or radio links between cameras (however, it does depend on occasional cable links lasting a few seconds). Also, whereas the time codes used in prior video-camera-synchronization systems typically repeat after 24 hours, the time code used in this system does not repeat for slightly more than 136 years; hence, this system is much better suited for long-term deployment of multiple cameras
New Features of Extended Wormhole Solutions in the Scalar Field Gravity Theories
The present paper reports interesting new features that wormhole solutions in
the scalar field gravity theory have. To demonstrate these, we obtain, by using
a slightly modified form of the Matos-Nunez algorithm, an extended class of
asymptotically flat wormhole solutions belonging to Einstein minimally coupled
scalar field theory. Generally, solutions in these theories do not represent
traversable wormholes due to the occurrence of curvature singularities.
However, the Ellis I solution of the Einstein minimally coupled theory, when
Wick rotated, yields Ellis class III solution, the latter representing a
singularity-free traversable wormhole. We see that Ellis I and III are not
essentially independent solutions. The Wick rotated seed solutions, extended by
the algorithm, contain two new parameters a and \delta;. The effect of the
parameter a on the geodesic motion of test particles reveals some remarkable
features. By arguing for Sagnac effect in the extended Wick rotated solution,
we find that the parameter a can indeed be interpreted as a rotation parameter
of the wormhole. The analyses reported here have wider applicability in that
they can very well be adopted in other theories, including in the string
theory.Comment: 19 page
Vacuum Expectation Value of the Spinor Massive field in the Cosmic String Space-Time
We found the contribution to the vacuum expectation value of the
energy-momentum tensor of a massive Dirac field due to the conical geometry of
the cosmic string space-time. The heat kernel and heat kernel expansion for the
squared Dirac operator in this background are also considered and the first
three coefficients were found in an explicity form.Comment: 9 pages, 1 figure (2 ref added) (enlarged version
A qualitative analysis of migrant social workersâ work experiences and perceived prejudice from an empowering acculturative integration approach
An increasing number of migrant social workers are employed in the UK social work sector. This article explores the acculturative integration experiences of a small group of migrant social workers. We critically observe that research on migrant professionalsâ trajectories should adopt theories that emphasise peopleâs empowerment and potential for agency. We use a framework drawing on liberation psychology for analysing the autobiographical narratives of a sample of migrant social workers employed in England. Findings indicate that the participants perceived prejudice on a number of occasions and circumstances. Even though in their narrative of survival they talked about activating several psychosocial resources, they were sceptical about their professional development and dissatisfied at work. The paper discusses the emerging findings while highlighting the frameworkâs relevance for understanding these experiences from an empowering acculturation perspective and suggesting ways of improving migrant social workersâ acculturative integration by addressing systemic barriers
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report
This Report summarizes the proceedings of the 2015 Les Houches workshop on
Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant
for high precision Standard Model calculations, (II) the new PDF4LHC parton
distributions, (III) issues in the theoretical description of the production of
Standard Model Higgs bosons and how to relate experimental measurements, (IV) a
host of phenomenological studies essential for comparing LHC data from Run I
with theoretical predictions and projections for future measurements in Run II,
and (V) new developments in Monte Carlo event generators.Comment: Proceedings of the Standard Model Working Group of the 2015 Les
Houches Workshop, Physics at TeV Colliders, Les Houches 1-19 June 2015. 227
page
Factors influencing research engagement: research interest, confidence and experience in an Australian speech-language pathology workforce
Background: Recent initiatives within an Australia public healthcare service have seen a focus on increasing the research capacity of their workforce. One of the key initiatives involves encouraging clinicians to be research generators rather than solely research consumers. As a result, baseline data of current research capacity are essential to determine whether initiatives encouraging clinicians to undertake research have been effective. Speech pathologists have previously been shown to be interested in conducting research within their clinical role; therefore they are well positioned to benefit from such initiatives. The present study examined the current research interest, confidence and experience of speech language pathologists (SLPs) in a public healthcare workforce, as well as factors that predicted clinician research engagement
Monte Carlo simulations of Higgs-boson production at the LHC with the KrkNLO method
We present numerical tests and predictions of the KrkNLO method for matching
of NLO QCD corrections to hard processes with LO parton shower Monte Carlo
generators (NLO+PS). This method was described in detail in our previous
publications, where it was also compared with other NLO+PS matching approaches
(MC@NLO and POWHEG) as well as fixed-order NLO and NNLO calculations. Here we
concentrate on presenting some numerical results (cross sections and
distributions) for (Drell-Yan) and Higgs-boson production
processes at the LHC. The Drell--Yan process is used mainly to validate the
KrkNLO implementation in the Herwig 7 program with respect to the previous
implementation in Sherpa. We also show predictions for this process with the
new, complete, MC-scheme parton distribution functions and compare them with
our previously published results. Then, we present the first results of the
KrkNLO method for Higgs production in gluon-gluon fusion at the LHC and compare
them with MC@NLO and POWHEG predictions from Herwig 7 fixed-order results from
HNNLO and a resummed calculation from HqT, as well as with experimental data
from the ATLAS collaboration.Comment: 21 pages, 9 figures, version published in EPJ
Urban Heat Island Effect on the Energy Consumption of Institutional Buildings in Rome
The urban heat island (UHI) effect is constantly increasing the energy consumption of buildings, especially in summer periods. The energy gap between the estimated energy performance - often simulated without considering UHI - and the real operational consumption is especially relevant for institutional buildings, where the cooling needs are in general higher than in other kind of buildings, due to more internal gains (people, appliances) and different architectural design (more transparent façades and light walls). This paper presents a calculation of the energy penalty due to UHI in two institutional buildings in Rome. Urban Weather Generator (UWG) is used to generate a modified weather file, taking into account the UHI phenomenon. Then, two building performance simulations are done for each case: the first simulation uses a standard weather file and the second uses the modified one. Results shows how is it necessary to re-develop mitigation strategies and a new energy retrofit approach, in order to include urbanization ad UHI effect, especially in this kind of buildings, characterized by very poor conditions of comfort during summer, taking into account users and occupant-driven demand
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