19,925 research outputs found
Costs and Returns Analysis for South Carolina Shrimp Trawlers
This document provides an explanation on how shrimp trawler owners/operators can analyze the effects of changing costs and ex-vessel prices on the profitability of operating a shrimp trawler. An Excel spreadsheet is provided with sample boat costs and revenues. The spreadsheet allows the trawler owner/operator to enter costs and revenues data for their own vessel. This can be used to estimate average costs of landing a pound of shrimp by the vessel owner/operator and the profit (loss) per pound of landed shrimp. As input costs vary for key items like fuel, ice, BRDS, etc, the trawler owner can estimate the impact of these input costs on the total average cost of landing a pound of shrimp. Similarly, as the ex-vessel (landed) price for a pound of shrimp changes, the vessel owner/operator can estimate the impact of these price changes on the profitability of operating the trawler.Resource /Energy Economics and Policy,
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Working memory and developmental language impairments
Children with developmental language impairments (DLI) are often reported to show difficulties with working memory. This review describes the four components of the well-established working memory model, and considers whether there is convincing evidence for difficulties with in each component in children with DLI. The emphasis is on the most demanding form of working memory that draws on central executive (CE) resources, requiring concurrent processing and storage of information. An evaluation of recent research evidence suggests that, not only are children with DLI impaired on verbal CE measures, but they also show difficulties on non-verbal CE tasks that cannot be assumed to tap language. Therefore, it seems increasingly likely that children with DLI show domain-general CE impairments, along with their more established impairments in verbal short-term memory. Implications for potential working memory interventions and classroom learning are discussed
Magnetic and thermodynamic properties of cobalt doped iron pyrite: Griffiths Phase in a magnetic semiconductor
Doping of the band insulator FeS with Co on the Fe site introduces a
small density of itinerant carriers and magnetic moments. The lattice constant,
AC and DC magnetic susceptibility, magnetization, and specific heat have been
measured over the range of Co concentration. The variation of
the AC susceptibility with hydrostatic pressure has also been measured in a
small number of our samples. All of these quantities show systematic variation
with including a paramagnetic to disordered ferromagnetic transition at
. A detailed analysis of the changes with temperature and
magnetic field reveal small power law dependencies at low temperatures for
samples near the critical concentration for magnetism, and just above the Curie
temperature at higher . In addition, the magnetic susceptibility and
specific heat are non-analytic around H=0 displaying an extraordinarily sharp
field dependence in this same temperature range. We interpret this behavior as
due to the formation of Griffiths phases that result from the quenched disorder
inherent in a doped semiconductor.Comment: 22 pages including 27 figure
Study in optimization of microcircuit design Final report
Optimization of microcircuit reliabilit
Discovery of Griffiths phase in itinerant magnetic semiconductor Fe_{1-x}Co_xS_2
Critical points that can be suppressed to zero temperature are interesting
because quantum fluctuations have been shown to dramatically alter electron gas
properties. Here, the metal formed by Co doping the paramagnetic insulator
FeS, FeCoS, is demonstrated to order ferromagnetically at
where we observe unusual transport, magnetic, and
thermodynamic properties. We show that this magnetic semiconductor undergoes a
percolative magnetic transition with distinct similarities to the Griffiths
phase, including singular behavior at and zero temperature.Comment: 10 pages, 4 figure
Multi-Detector Coronary CT Imaging for the Identification of Coronary Artery Stenoses in a Real-World Population
BACKGROUND: Multi-detector computed tomography (CT) has emerged as a modality for the non-invasive assessment of coronary artery disease (CAD). Prior studies have selected patients for evaluation and have excluded many of the real-world patients commonly encountered in daily practice. We compared 64-detector-CT (64-CT) to conventional coronary angiography (CA) to investigate the accuracy of 64-CT in determining significant coronary stenoses in a real-world clinical population. METHODS: A total of 1,818 consecutive patients referred for 64-CT were evaluated. CT angiography was performed using the GE LightSpeed VCT (GE((R)) Healthcare). Forty-one patients in whom 64-CT results prompted CA investigation were further evaluated, and results of the two diagnostic modalities were compared. RESULTS: A total of 164 coronary arteries and 410 coronary segments were evaluated in 41 patients (30 men, 11 women, age 39-85 years) who were identified by 64-CT to have significant coronary stenoses and who thereafter underwent CA. The overall per-vessel sensitivity, specificity, positive predictive value, negative predictive value, and accuracy at the 50% stenosis level were 86%, 84%, 65%, 95%, and 85%, respectively, and 77%, 93%, 61%, 97%, and 91%, respectively, in the per-segment analysis at the 50% stenosis level. CONCLUSION: 64-CT is an accurate imaging tool that allows a non-invasive assessment of significant CAD with a high diagnostic accuracy in a real-world population of patients. The sensitivity and specificity that we noted are not as high as those in prior reports, but we evaluated a population of patients that is typically encountered in clinical practice and therefore see more real-world results
Group-work: does it have to be that bad?
Many accreditation bodies and universities require the graduate attribute of "an ability to work in teams" or to "effectively collaborate". Students invariably dislike working in groups maintaining that "malingerers ride on the back" of those students who work hard and contribute effectively to the outcomes of the group or team. This is the context in which an ALTC/OLT project was established, the project is to consider ways of enhancing group-work in Architecture and design related disciplines. The project has identified the issues associated with group-work, from the perspective of student and lecturer, and has begun to develop strategies to overcome the issues. This paper reports on an assessment intervention made in a subject that involved significant levels of group-work, the initiative gained interesting responses from the students involved. Interestingly the class was multi-disciplinary and with a large percentage of international students. The students articulated during the focus group at the end of the experience were positive about the experience of having to collaborate. This paper reports on the assessment initiative as well as providing some insights into the students\u27 experiences of working in groups
Electromagnetic dipole moments of charged baryons with bent crystals at the LHC
We propose a unique program of measurements of electric and magnetic dipole
moments of charm, beauty and strange charged baryons at the LHC, based on the
phenomenon of spin precession of channeled particles in bent crystals. Studies
of crystal channeling and spin precession of positively- and negatively-charged
particles are presented, along with feasibility studies and expected
sensitivities for the proposed experiment using a layout based on the LHCb
detector.Comment: 19 pages, 13 figure
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