Spherically symmetric teleparallel geometries.

We are interested in the development of spherically symmetric geometries in () teleparallel gravity which are of physical importance. We first express the general forms for the spherically symmetric frame and the zero curvature, metric compatible, spin connection. We then analyse the antisymmetric field equations (the solutions of which split into two cases, which we subsequently consider separately), and derive and analyse the resulting symmetric field equations.

Generalized teleparallel de Sitter geometries.

Theories of gravity based on teleparallel geometries are characterized by the torsion, which is a function of the coframe, derivatives of the coframe, and a zero curvature and metric compatible spin-connection. The appropriate notion of a symmetry in a teleparallel geometry is that of an affine symmetry. Due to the importance of the de Sitter geometry and Einstein spaces within General Relativity, we shall describe teleparallel de Sitter geometries and discuss their possible generalizations.

[Resilience against IT attacks in hospitals : Results from an exercise in a German university hospital].

Background: According to the legal definition healthcare systems and their components (e.g., hospitals) are part of the critical infrastructure of modern industrial nations.

Dental students and recent dental graduates' perceptions of preparedness in treating pediatric patients.

Purpose/objectives: To survey potential applicants applying to advanced education in pediatric dental programs and evaluate their preparedness upon graduating from an accredited dental school.

Methods: Attendees of a virtual externship of a University program were recruited to participate in a web-based survey. The survey collected demographic data, current levels of confidence with various pediatric clinical procedures, predicted confidence with those procedures, and number of procedures completed.

Comparing Cs binding affinity of Keggin type polyoxometalate and sodium Tetrakis(4-florophenyl)borate in solution and from Cs-doped pure phase vermiculite.

We assessed the aptitude of cesium (Cs) binding by Keggin type polyoxometalates (POMs) and compared the results with the Cs binding by sodium tetrakis(4-fluorophenyl)-borate (Na-TFPB). In this work, we aimed to establish a system to treat radioactive Cs contaminated soil with POMs economically. We evaluated the effect of initial Cs concentration (0.

Intraspecific competition facilitates the evolution of tolerance to insect damage in the perennial plant Solanum carolinense.

Tolerance to herbivory (the degree to which plants maintain fitness after damage) is a key component of plant defense, so understanding how natural selection and evolutionary constraints act on tolerance traits is important to general theories of plant-herbivore interactions. These factors may be affected by plant competition, which often interacts with damage to influence trait expression and fitness. However, few studies have manipulated competitor density to examine the evolutionary effects of competition on tolerance.

Rasburicase for the management of tumor lysis syndrome in neonates.

Objective: To describe the management of tumor lysis syndrome (TLS) with rasburicase in 2 patients who presented with cancer within the first month of life and compare and contrast both cases with respect to their underlying renal physiology, management, and eventual outcome.

Case Summary: TLS developed in 2 neonates born at 38 weeks' gestational age; both were managed in part with rasburicase. One patient was a 21-day-old infant who received 2 days of induction chemotherapy for the treatment of congenital Stage IV-S neuroblastoma.

GMENAC: its manpower forecasting framework.

The Graduate Medical Education National Advisory Committee (GMENAC) was an advisory group to the Secretary, US Department of Health and Human Services. Its charter ended September 30, 1980. It submitted 107 recommendations to achieve a better balance between future physician requirements and future physician supply, by specialty and geography.

Cryogenic infrared grating spectrometer.

A liquid-helium-cooled Ebert-Fastie grating spectrometer for use in a sounding rocket is described. Twelve detectors and associated filters separate the 5-70-microm spectral range into twelve intervals, each of which is scanned as the grating is rotated. The instrument was launched into an aurora from Fort Churchill, Canada, but a cryogenic failure occurred early in the flight, and only a small amount of data was obtained.

A Rocket-Borne Liquid Helium-Cooled Infrared Telescope. II: Photoconductive Detectors.

In the absence of a thermal radiation background, it is possible to obtain a very high responsivity with far ir extrinsic photoconductive detectors. Using a low noise liquid helium-cooled preamplifier, we have obtained an NEP of 10(-14) W Hz(-(1/2)) for Ge: Ga at 100 micro in an instrument designed for rocket ir astronomy. The limiting noise factor appears to be generation recombination noise due to thermal excitation of other impurities present in the germanium.

A rocket-borne liquid helium-cooled infrared telescope. I: dewar and optics.

A telescope for rocket-borne ir astronomy is described. It consists of a 166-mm cassegrainian telescope cooled to liquid helium temperature and operated with a total radiation chopper. Details of the optical, cryogenic, and electronic designs are given.

A liquid nitrogen cooled, rocket borne, infrared telescope.

We have constructed a liquid nitrogen cooled telescope that was flown in an Aerobee 150 rocket. The telescope allows measurement of absolute ir signal strengths from astronomical objects in the wavelength range out to about 7.5 micro.