Investigation of new systems for potential laser action Quarterly status report, 1 Dec. 1968 - 28 Feb. 1969

Electronic absorption spectra of mercuric iodid

Investigation of new systems for potential laser action Quarterly report, 1 Jun. - 30 Sep. 1969

Metal halides as new chemical system for laser actio

Possible mechanisms of explosive maritime cyclogenesis

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology and Physical Oceanography, 1983.Microfiche copy available in Archives and Science.Bibliography: leaves 126-127.by Paul Joseph Roebber.M.S

Voices from the coast : drawing on family funds of knowledge to build ocean literacy and home school partnerships

In this qualitative study, ethnographic methods were used to identify parent funds of knowledge related to ocean literacy in a rural, coastal context. Participants included 16 parents of students in the teacher-researcher's third-grade classroom. Interactions between parent-child, parent-parent, and parent and the teacher-researcher were studied in order to determine factors that influence home-school partnership. Data collection occurred through (1) artifacts resulting from parent-child activities during three Ocean Literacy Family Nights, (2) parent study groups, and (3) in-depth interviews with six focal parents. Grounded theory methods were used to code and analyze the data. Study findings suggest that a funds of knowledge approach to building ocean literacy is an effective means of building home-school partnership as well as a sense of community among parents of diverse backgrounds. This is supported by parent response to (1) the process of accessing parent funds of knowledge related to ocean literacy, (2) their shared experience in a different kind of family night, and (3) exploration of the interactions that occurred through study activities. Implications for future research using a funds of knowledge approach and for humanizing home-school partnership are presented

Impacts of Dark Stars on Reionization and Signatures in the Cosmic Microwave Background

We perform a detailed and systematic investigation of the possible impacts of dark stars upon the reionization history of the Universe, and its signatures in the cosmic microwave background (CMB). We compute hydrogen reionization histories, CMB optical depths and anisotropy power spectra for a range of stellar populations including dark stars. If dark stars capture large amounts of dark matter via nuclear scattering, reionization can be substantially delayed, leading to decreases in the integrated optical depth to last scattering and large-scale power in the EE polarization power spectrum. Using the integrated optical depth observed by WMAP7, in our canonical reionization model we rule out the section of parameter space where dark stars with high scattering-induced capture rates tie up more than ~90% of all the first star-forming baryons, and live for over ~250 Myr. When nuclear scattering delivers only moderate amounts of dark matter, reionization can instead be sped up slightly, modestly increasing the CMB optical depth. If dark stars do not obtain any dark matter via nuclear scattering, effects upon reionization and the CMB are negligible. The effects of dark stars upon reionization and its CMB markers can be largely mimicked or compensated for by changes in the existing parameters of reionization models, making dark stars difficult to disentangle from astrophysical uncertainties, but also widening the range of standard parameters in reionization models that can be made consistent with observations.Comment: Small changes in response to referee's comments; matches version accepted for publication in ApJ. 14 pages, 9 figure