Starburst Galaxies: Hard X-ray spectra and contribution to the diffuse background

During the period of this grant two main tasks were performed: a determination of a selection criterion for starburst galaxies most likely to emit X-rays, and performance of a pilot study of the X-ray emission from nine such systems. Starburst galaxies may be expected to emit flat-spectrum X-ray at energies above 10 keV resulting from the various remnants of the short-lived massive stars which characterize the starburst. The investigation to determine the optimum sample resulted in a change from an X-ray selected (HEAO-2) sample to infrared selection based on the IRAS catalogue. A much broader sample thereby available for study, and selection could be limited to only the nearest objects and still obtain a reasonably large sample. A sample of 99 of the brightest infrared starburst galaxies was settled on for the X-ray survey. For a set of practical size, this was then reduced to a subset of 53, based on luminosity and nearness. X-ray emission from these objects was individually measured from the UCSD HEAO-1 all-sky survey in four energy bands between 13 keV to 160 keV. This data base consists of about 20 optical disk volumes. Net significance for the result was roughly two sigma, and a very hard spectral shape is indicated for the net spectrum of the surveyed galaxies. With the possibility of detection of the class, it was then felt worthwhile to examine fluxes from these sources in other archival data. This was performed with the HEAO-1 A2 data and the HEAO-2 (EINSTEIN) main archive and slew survey. Positive results were also obtained for the sample, but again at weak significance. With three independent measures of weak X-ray fluxes from nearby starburst galaxies, we wrote a letter to the Astrophysical Journal (enclosed) discussing these results and their likely significance, in particular, for the contribution to the cosmic diffuse x-ray background, perhaps as much as 25 percent

Method and apparatus for optical modulating a light signal Patent

Method and apparatus for optically modulating light or microwave bea

Optically induced free carrier light modulator

Signal carrier laser beam is optically modulated by a second laser beam of different frequency acting on a free carrier source to which the signal carrier laser is directed. The second laser beam affects the transmission characteristics of the free carrier source to light from the signal carrier laser, thus modulating it

Pulse ignition characterization of mercury ion thruster hollow cathode using an improved pulse ignitor

An investigation of the high voltage pulse ignition characteristics of the 8 cm mercury ion thruster neutralizer cathode identified a low rate of voltage rise and long pulse duration as desirable factors for reliable cathode starting. Cathode starting breakdown voltages were measured over a range of mercury flow rates and tip heater powers for pulses with five different rates of voltage rise. Breakdown voltage requirements for the fastest rising pulse (2.5 to 3.0 kV/micro sec) were substantially higher (2 kV or more) than for the slowest rising pulse (0.3 to 0.5 kV/micro sec) for the same starting conditions. Also described is an improved, low impedance pulse ignitor circuit which reduces power losses and eliminates problems with control and packaging associated with earlier designs

Positive Measure Spectrum for Schroedinger Operators with Periodic Magnetic Fields

We study Schroedinger operators with periodic magnetic field in Euclidean 2-space, in the case of irrational magnetic flux. Positive measure Cantor spectrum is generically expected in the presence of an electric potential. We show that, even without electric potential, the spectrum has positive measure if the magnetic field is a perturbation of a constant one.Comment: 17 page

Langevin equation for the extended Rayleigh model with an asymmetric bath

In this paper a one-dimensional model of two infinite gases separated by a movable heavy piston is considered. The non-linear Langevin equation for the motion of the piston is derived from first principles for the case when the thermodynamic parameters and/or the molecular masses of gas particles on left and right sides of the piston are different. Microscopic expressions involving time correlation functions of the force between bath particles and the piston are obtained for all parameters appearing in the non-linear Langevin equation. It is demonstrated that the equation has stationary solutions corresponding to directional fluctuation-induced drift in the absence of systematic forces. In the case of ideal gases interacting with the piston via a quadratic repulsive potential, the model is exactly solvable and explicit expressions for the kinetic coefficients in the non-linear Langevin equation are derived. The transient solution of the non-linear Langevin equation is analyzed perturbatively and it is demonstrated that previously obtained results for systems with the hard-wall interaction are recovered.Comment: 10 pages. To appear in Phys. Rev.

Bringing Home the Bacon: A Case for Applying the New Jersey Urban School Funding Remedy from Abbott v. Burke to Poor Rural School Districts

In 1997, seventeen poor rural school districts in New Jersey filed a lawsuit seeking a declaration that their districts were in violation of its students’ state constitutional right to a "thorough and efficient" education, and a financial remedy akin to the one granted to poor urban districts in Abbott v. Burke. Fifteen years and four decisions later, these districts are still inadequately funded and providing a constitutionally inadequate education to the students therein. This Article analyzes the state of education funding law in New Jersey, under the governing Abbott v. Burke decisions, and argues that there is no significant legal distinction barring the poor rural districts from access to the same, or similar, remedial measures

Successful Leadership Development

This poster looks at leadership development and what attributes make a good leader. It touches on the importance of role models, mentors, and sponsors in both a young professionals leadership development and their career advancement. Furthermore, it examines when a leader has reached the end of their shelf-life and how an organization can properly prepare for the introduction of a new leader. Finally, the poster looks at the importance of passion and emotional intelligence in effective leadership

Improving Inpatient Influenza Compliance Rates with a Standing Orders Program

Influenza vaccinations are recommended yearly as part of a primary care performance measure to prevent and control seasonal influenza. Rates of influenza are steadily increasing and can lead to severe negative impacts and even fatalities with patients. According to the Center for Disease Control (CDC)’s Morbidity and Mortality Weekly Report (MMWR), less than 40 percent of the U.S. population receives the flu vaccine yearly. It is suggested by the CDC that Annual vaccination is the most effective method for preventing influenza virus infection and its complications. The Department of Health and Human Services’ Healthy People 2020 includes a goal of reaching 90 percent vaccination rates for both influenza and pneumococcal vaccinations for persons 65 and older, however this should stand for the rest of the population as well. Research suggests that inpatient vaccination is a method of improving overall vaccination rates, especially in the population that is 65 and older. It is imperative that compliance rates and policies be reviewed in order to utilize best practice. This quality improvement project was designed to find the best practice to implement a solution to improving the existing low compliance rates on a step-down unit in a city centered Level 1 Trauma hospital. After interviews with both nurses and patients and review of best practice literature, the conclusion was made that a Standing Orders Program should be implemented. Taking into consideration resources, timing and staff compliance of a new policy, the use of Standing Orders can help improve compliance rates at the trauma center in the San Francisco Bay Area