4,392 research outputs found
The Supereigenvalue Model in the Double-Scaling Limit
The double-scaling limit of the supereigenvalue model is performed in the
moment description. This description proves extremely useful for the
identification of the multi-critical points in the space of bosonic and
fermionic coupling constants. An iterative procedure for the calculation of
higher-genus contributions to the free energy and to the multi-loop correlators
in the double-scaling limit is developed. We present the general structure of
these quantities at genus g and give explicit results up to and including genus
two.Comment: 19 pages, LaTe
Submaximal Decision Theory and Health Resource Conservation: The Example of Congestive Heart Failure
The challenge of eliminating disparities in chronic illness in the United States is hampered by the diversity of the epidemiology of the chronic conditions themselves, and by the individuality of the communities and patients affected by them. This article outlines some of the ways in which the complexity of chronic illness in underserved communities in the United States limits the data and the strategies available to clinicians and patients. We then present the example of chronic heart failure (CHF) to illustrate a possible solution that we are developing for supporting underserved patients’ selfmanagement of chronic illness: individualized health care (through “personal normals” derived from the patient’s own clinical history combined with population-based data), and distributed health care (point of care through wireless biosensors and community health workers). We present some of the possible barriers to the implementation of the model. Conclusion: we believe that this approach is a pathway to empowering CHF patients in underserved communities. Further research is necessary to test the clinical viability of the model and the acceptability of the model for patients, physicians, and families
The Hot R Coronae Borealis Star DY Centauri is a Binary
The remarkable hot R Coronae Borealis (RCB) star DY Cen is revealed to be the first and only binary system to be found among the RCB stars and their likely relatives, including the extreme helium stars and the hydrogen-deficient carbon stars. Radial velocity determinations from 1982 to 2010 have shown that DY Cen is a single-lined spectroscopic binary in an eccentric orbit with a period of 39.67 days. It is also one of the hottest and most H-rich member of the class of RCB stars. The system may have evolved from a common envelope to its current form.Spanish Ministry of Economy and Competitiveness AYA-2011-27754McDonald Observator
Data management of on-line partial discharge monitoring using wireless sensor nodes integrated with a multi-agent system
On-line partial discharge monitoring has been the subject of significant research in previous years but little work has been carried out with regard to the management of on-site data. To date, on-line partial discharge monitoring within a substation has only been concerned with single plant items, so the data management problem has been minimal. As the age of plant equipment increases, so does the need for condition monitoring to ensure maximum lifespan. This paper presents an approach to the management of partial discharge data through the use of embedded monitoring techniques running on wireless sensor nodes. This method is illustrated by a case study on partial discharge monitoring data from an ageing HVDC reactor
Iterative Solution of the Supereigenvalue Model
An integral form of the discrete superloop equations for the supereigenvalue
model of Alvarez-Gaume, Itoyama, Manes and Zadra is given. By a change of
variables from coupling constants to moments we find a compact form of the
planar solution for general potentials. In this framework an iterative scheme
for the calculation of higher genera contributions to the free energy and the
multi-loop correlators is developed. We present explicit results for genus one.Comment: 21 pages, LaTeX, no figure
Lactate: brain fuel in human traumatic brain injury: a comparison with normal healthy control subjects.
We evaluated the hypothesis that lactate shuttling helps support the nutritive needs of injured brains. To that end, we utilized dual isotope tracer [6,6-(2)H2]glucose, that is, D2-glucose, and [3-(13)C]lactate techniques involving arm vein tracer infusion along with simultaneous cerebral (arterial [art] and jugular bulb [JB]) blood sampling. Traumatic brain injury (TBI) patients with nonpenetrating brain injuries (n=12) were entered into the study following consent of patients' legal representatives. Written and informed consent was obtained from control volunteers (n=6). Patients were studied 5.7±2.2 (mean±SD) days post-injury; during periods when arterial glucose concentration tended to be higher in TBI patients. As in previous investigations, the cerebral metabolic rate for glucose (CMRgluc, i.e., net glucose uptake) was significantly suppressed following TBI (p<0.001). However, lactate fractional extraction, an index of cerebral lactate uptake related to systemic lactate supply, approximated 11% in both healthy control subjects and TBI patients. Further, neither the CMR for lactate (CMRlac, i.e., net lactate release), nor the tracer-measured cerebral lactate uptake differed between healthy controls and TBI patients. The percentages of lactate tracer taken up and released as (13)CO2 into the JB accounted for 92% and 91% for control and TBI conditions, respectively, suggesting that most cerebral lactate uptake was oxidized following TBI. Comparisons of isotopic enrichments of lactate oxidation from infused [3-(13)C]lactate tracer and (13)C-glucose produced during hepatic and renal gluconeogenesis (GNG) showed that 75-80% of (13)CO2 released into the JB was from lactate and that the remainder was from the oxidation of glucose secondarily labeled from lactate. Hence, either directly as lactate uptake, or indirectly via GNG, peripheral lactate production accounted for ∼70% of carbohydrate (direct lactate uptake+uptake of glucose from lactate) consumed by the injured brain. Undiminished cerebral lactate fractional extraction and uptake suggest that arterial lactate supplementation may be used to compensate for decreased CMRgluc following TBI
A Planetary Companion to gamma Cephei A
We report on the detection of a planetary companion in orbit around the
primary star of the binary system Cephei. High precision radial
velocity measurements using 4 independent data sets spanning the time interval
1981--2002 reveal long-lived residual radial velocity variations superimposed
on the binary orbit that are coherent in phase and amplitude with a period or
2.48 years (906 days) and a semi-amplitude of 27.5 m s. We performed a
careful analysis of our Ca II H & K S-index measurements, spectral line
bisectors, and {\it Hipparcos} photometry. We found no significant variations
in these quantities with the 906-d period. We also re-analyzed the Ca II
8662 {\AA} measurements of Walker et al. (1992) which showed possible
periodic variations with the ``planet'' period when first published. This
analysis shows that periodic Ca II equivalent width variations were only
present during 1986.5 -- 1992 and absent during 1981--1986.5. Furthermore, a
refined period for the Ca II 8662 {\AA} variations is 2.14 yrs,
significantly less than residual radial velocity period. The most likely
explanation of the residual radial velocity variations is a planetary mass
companion with sin = 1.7 and an orbital semi-major axis
of 2.13 AU. This supports the planet hypothesis for the residual
radial velocity variations for Cep first suggested by Walker et al.
(1992). With an estimated binary orbital period of 57 years Cep is the
shortest period binary system in which an extrasolar planet has been found.
This system may provide insights into the relationship between planetary and
binary star formation.Comment: 19 pages, 15 figures, accepted in Ap. J. Includes additional data and
improved orbital solutio
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