490 research outputs found
Modular differential equations for torus one-point functions
It is shown that in a rational conformal field theory every torus one-point
function of a given highest weight state satisfies a modular differential
equation. We derive and solve these differential equations explicitly for some
Virasoro minimal models. In general, however, the resulting amplitudes do not
seem to be expressible in terms of standard transcendental functions.Comment: 19 pages, LaTeX; reference adde
Learning to work interculturally and virtually: Developing postgraduate hospitality management students across international HE institutions
Given the challenges of developing inter-culturally competent, digitally literate, team players amidst a realm of other postgraduate competencies this paper outlines the initiative developed by academic teams from three European institutions. The paper outlines the virtual intercultural collaboration and its development and then reports on the results of a survey conducted with participating students from two years of the initiative. Students' perceptions of the generic value of specific skills sets in virtual team working and intercultural competence are identified as well as their views of the specific project's capacity to develop their own skills in the relevant areas, are explored. The results suggest that since social media, team work and intercultural interactions seem to be ever present dimensions of the contemporary world of work it appears to be important that students encounter meaningful virtual and intercultural learning opportunities during their postgraduate management studies. Finally this paper highlights the value of inter-programme teaching and learning collaborative activities between European higher education institutions
On the complete classification of the unitary N=2 minimal superconformal field theories
Aiming at a complete classification of unitary N=2 minimal models (where the
assumption of space-time supersymmetry has been dropped), it is shown that each
modular invariant candidate of a partition function for such a theory is indeed
the partition function of a minimal model. A family of models constructed via
orbifoldings of either the diagonal model or of the space-time supersymmetric
exceptional models demonstrates that there exists a unitary N=2 minimal model
for every one of the allowed partition functions in the list obtained from
Gannon's work.
Kreuzer and Schellekens' conjecture that all simple current invariants can be
obtained as orbifolds of the diagonal model, even when the extra assumption of
higher-genus modular invariance is dropped, is confirmed in the case of the
unitary N=2 minimal models by simple counting arguments.Comment: 53 pages; Latex; minor changes in v2: intro expanded, references
added, typos corrected, footnote added on p31; renumbering of sections; main
theorem reformulated for clarity, but contents unchanged. Minor revisions in
v3: typos corrected, footnotes 5, 6 added, lemma 1 and section 3.3.2
rewritten for greater generality, section 3.3 review removed. To appear in
Comm. Math. Phy
Geospatial framework to assess fireline effectiveness for large wildfires in the western USA, A
Includes bibliographical references (pages 16-19).Quantifying fireline effectiveness (FLE) is essential to evaluate the efficiency of large wildfire management strategies to foster institutional learning and improvement in fire management organizations. FLE performance metrics for incident-level evaluation have been developed and applied to a small set of wildfires, but there is a need to understand how widely they vary across incidents to progress towards targets or standards for performance evaluation. Recent efforts to archive spatially explicit fireline records from large wildfires facilitate the application of these metrics to a broad sample of wildfires in different environments. We evaluated fireline outcomes (burned over, held, not engaged) and analyzed incident-scale FLE for 33 large wildfires in the western USA from the 2017 and 2018 fire seasons. FLE performance metrics varied widely across wildfires and often aligned with factors that influence suppression strategy. We propose a performance evaluation framework based on both the held to engaged fireline ratio and the total fireline to perimeter ratio. These two metrics capture whether fireline was placed in locations with high probability of engaging with the wildfire and holding and the relative level of investment in containment compared to wildfire growth. We also identify future research directions to improve understanding of decision quality in a risk-based framework
Muddy waters: critiquing the historical criminology method in the investigation of the Smiley Face murders theory
As an emerging trans-disciplinary field, the operational use of historical criminology is a largely under-studied area. Examination of the use of archival research in studying cases connected to Gannon and Gilbertsonâs Smiley Face murders theory indicates that there is clear potential for historical criminology to be used to revisit closed or cold investigations to determine if the official findings of the case are consistent with the evidence. In the case of the Smiley Face murders theory, taking a historical criminology approach has failed to prove the hypothesis of researchers; nevertheless, use of historical research methods has had some success in forcing a re-evaluation of several cases, and should be considered an important tool in future investigations of this nature
An Introduction to Conformal Field Theory
A comprehensive introduction to two-dimensional conformal field theory is
given.Comment: 69 pages, LaTeX; references adde
The ASY-EOS experiment at GSI: investigating the symmetry energy at supra-saturation densities
The elliptic-flow ratio of neutrons with respect to protons in reactions of
neutron rich heavy-ions systems at intermediate energies has been proposed as
an observable sensitive to the strength of the symmetry term in the nuclear
Equation Of State (EOS) at supra-saturation densities. The recent results
obtained from the existing FOPI/LAND data for Au+Au collisions
at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate
of the symmetry term of the EOS but suffer from a considerable statistical
uncertainty. In order to obtain an improved data set for Au+Au collisions and
to extend the study to other systems, a new experiment was carried out at the
GSI laboratory by the ASY-EOS collaboration in May 2011.Comment: Talk given by P. Russotto at the 11th International Conference on
Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1,
2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference
Series (JPCS
Design and Bolometer Characterization of the SPT-3G First-year Focal Plane
During the austral summer of 2016-17, the third-generation camera, SPT-3G,
was installed on the South Pole Telescope, increasing the detector count in the
focal plane by an order of magnitude relative to the previous generation.
Designed to map the polarization of the cosmic microwave background, SPT-3G
contains ten 6-in-hexagonal modules of detectors, each with 269 trichroic and
dual-polarization pixels, read out using 68x frequency-domain multiplexing.
Here we discuss design, assembly, and layout of the modules, as well as early
performance characterization of the first-year array, including yield and
detector properties.Comment: Conference proceeding for Low Temperature Detectors 2017. Accepted
for publication: 27 August 201
Towards a single-chip, implantable RFID system: is a single-cell radio possible?
We present an overview of progress towards single-chip RFID solutions. To date heterogeneous integration has been appropriate for non-biological systems. However, for in-vivo sensors and even drug delivery systems, a small form factor is required. We discuss fundamental limits on the size of the form factor, the effect of the antenna, and propose a unified single-chip RFID solution appropriate for a broad range of biomedical in-vivo device applications, both current and future. Fundamental issues regarding the possibility of single cell RF radios to interface with biological function are discussed
High Performance In Vivo Near-IR (>1 {\mu}m) Imaging and Photothermal Cancer Therapy with Carbon Nanotubes
Short single-walled carbon nanotubes (SWNTs) functionalized by PEGylated
phospholipids are biologically non-toxic and long-circulating nanomaterials
with intrinsic near infrared photoluminescence (NIR PL), characteristic Raman
spectra, and strong optical absorbance in the near infrared (NIR). This work
demonstrates the first dual application of intravenously injected SWNTs as
photoluminescent agents for in vivo tumor imaging in the 1.0-1.4 {\mu}m
emission region and as NIR absorbers and heaters at 808 nm for photothermal
tumor elimination at the lowest injected dose (70 {\mu}g of SWNT/mouse,
equivalent to 3.6 mg/kg) and laser irradiation power (0.6 W/cm2) reported to
date. Ex vivo resonance Raman imaging revealed the SWNT distribution within
tumors at a high spatial resolution. Complete tumor elimination was achieved
for large numbers of photothermally treated mice without any toxic side effects
after more than six months post-treatment. Further, side-by-side experiments
were carried out to compare the performance of SWNTs and gold nanorods (AuNRs)
at an injected dose of 700 {\mu}g of AuNR/mouse (equivalent to 35 mg/kg) in NIR
photothermal ablation of tumors in vivo. Highly effective tumor elimination
with SWNTs was achieved at 10 times lower injected doses and lower irradiation
powers than for AuNRs. These results suggest there are significant benefits of
utilizing the intrinsic properties of biocompatible SWNTs for combined cancer
imaging and therapy.Comment: Nanoresearch, in pres
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