1,885 research outputs found
Neutrino-nucleus coherent scattering as a probe of neutron density distributions
Neutrino-nucleus coherent elastic scattering provides a theoretically
appealing way to measure the neutron part of nuclear form factors. Using an
expansion of form factors into moments, we show that neutrinos from stopped
pions can probe not only the second moment of the form factor (the neutron
radius) but also the fourth moment. Using simple Monte Carlo techniques for
argon, germanium, and xenon detectors of 3.5 tonnes, 1.5 tonnes, and 300 kg,
respectively, we show that the neutron radii can be found with an uncertainty
of a few percent when near a neutrino flux of
neutrinos/cm/s. If the normalization of the neutrino flux is known
independently, one can determine the moments accurately enough to discriminate
among the predictions of various nuclear energy functionals.Comment: 10 pages, 5 figure
Accounting Majors Perceptions Of Future Career Skills: An Exploratory Analysis
Business education is often criticized for its failure to develop lifelong skills. This study examines the opinions of 205 students to determine what skills they deem to be important for their future careers. The study then compares the opinions of accounting students against other business disciplines. The results of the study are mixed for the accounting profession. Many of the skills accounting majors ranked as important for their future were not surprising. However, there was some indication that accounting majors may be suffering from a silo effect and are not able to fully grasp how skills learned in other university courses impact their professional success
Evaluating Participatory Modeling: Developing a Framework for Cross-case Analysis
Participatory modeling is increasingly recognised as an effective way to assist collective decision-making processes in the domain of natural resource management. This paper introduces a framework for evaluating projects that have adopted a participatory modeling approach. This framework – known as the ‘Protocol of Canberra’ – was developed through a collaboration between French and Australian researchers engaged in participatory modeling and evaluation research. The framework seeks to assess the extent to which different participatory modeling practices reinforce or divert from the theoretical assumptions they are built upon. The paper discusses the application of the framework in three case-studies, two from Australia and one from the Pacific island of the Republic of Kiribati. The paper concludes with some comments for future use of the framework in a range of participatory modeling contexts, including fostering consideration of why and how different methodological approaches are used to achieve project aims and to build a collective vision amongst diverse stakeholders.participation, modeling, evaluation, complex systems science
Culturally Tailored Cancer Communication, Education, and Research: The Highways and Back Roads of Appalachia
We have varying experiences with Appalachia, yet we all agree that there is a unique relationship between Appalachians and cancer. Two of us are nurses who have worked with various communities. Two of us grew up here; 1 watched several of her relatives battle cancer in their Appalachian homes. All of us are scholars who want to talk with practitioners and researchers who are developing culturally tailored cancer control interventions. This goal to have a dialogue emerged after we had a series of discussions about cancer in Appalachia, discussions resulting in our developing a list of cultural traits that seem to be related to this region’s high cancer morbidity and morality (Table). For example, in one of our previous publications we describe the association between the traditional Appalachian oral culture and the cancer experience, finding that cancer stories appeared to pass from 1 generation to the next (1). In turn, these stories seem to affect some community members\u27 willingness to be screened. Our essay\u27s purpose is not to justify the elements presented in the Table. Rather, we write to consider the following: What are the advantages and disadvantages of making generalizations about a culture that has already been marginalized by overgeneralizations
Constraints on the Progenitor System of the Type Ia Supernova 2014J from Pre-Explosion Hubble Space Telescope Imaging
We constrain the properties of the progenitor system of the highly reddened
Type Ia supernova (SN) 2014J in Messier 82 (M82; d ~ 3.5 Mpc). We determine the
SN location using Keck-II K-band adaptive optics images, and we find no
evidence for flux from a progenitor system in pre-explosion near-ultraviolet
through near-infrared Hubble Space Telescope (HST) images. Our upper limits
exclude systems having a bright red giant companion, including symbiotic novae
with luminosities comparable to that of RS Ophiuchi. While the flux constraints
are also inconsistent with predictions for comparatively cool He-donor systems
(T < ~35,000 K), we cannot preclude a system similar to V445 Puppis. The
progenitor constraints are robust across a wide range of R_V and A_V values,
but significantly greater values than those inferred from the SN light curve
and spectrum would yield proportionally brighter luminosity limits. The
comparatively faint flux expected from a binary progenitor system consisting of
white dwarf stars would not have been detected in the pre-explosion HST
imaging. Infrared HST exposures yield more stringent constraints on the
luminosities of very cool (T < 3000 K) companion stars than was possible in the
case of SN Ia 2011fe.Comment: Accepted by ApJ 14 May 2014 with only minor revision
Determinants of the outcome of electrophysiologic study in patients with ventricular tachyarrhythmias
To determine those factors predictive of the ability to both initiate and suppress ventricular tachyarrhythmias during electrophysiologic study, the results of programmed cardiac stimulation were evaluated in 261 patients: 66 presenting with nonsustained ventricular tachycardia, 91 with sustained ventricular tachycardia and 104 with ventricular fibrillation. Multivariate logistic regression analysis revealed that the presenting arrhythmia was a potent and independent predictor of the ability to provoke ventricular arrhythmias at electrophysiologic study; a history of myocardial infarction and male sex were also significant independent predictors. Of patients presenting with sustained ventricular tachycardia, 89% (81 of 91) had inducible ventricular arrhythmias compared with 61 (40 of 66) and 66% (69 of 104) of patients with nonsustained ventricular tachycardia and ventricular fibrillation, respectively.Complete suppression of inducible arrhythmias could be achieved in only 52% (34 of 66) of patients with sustained ventricular tachycardia, compared with 73 (24 of 33) and 75% (46 of 61) of patients presenting with nonsustained ventricular tachycardia and ventricular fibrillation, respectively. Multivariate analysis showed that the major independent determinants of the ability to suppress inducible arrhythmias were the number of drug trials performed before electrophysiologic study (inversely correlated) and the nature of the induced arrhythmia.The nature of the presenting clinical arrhythmia is, therefore, a highly significant and independent predictor of the ability to induce ventricular arrhythmias during electrophysiologic testing and an important determinant of the ability to suppress induced arrhythmias in patients with spontaneous ventricular tachyarrhythmias
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