Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies

We obtain novel closed form solutions to the Friedmann equation for cosmological models containing a component whose equation of state is that of radiation $(w=1/3)$ at early times and that of cold pressureless matter $(w=0)$ at late times. The equation of state smoothly transitions from the early to late-time behavior and exactly describes the evolution of a species with a Dirac Delta function distribution in momentum magnitudes $|\vec{p}_0|$ (i.e. all particles have the same $|\vec{p}_0|$). Such a component, here termed "hot matter", is an approximate model for both neutrinos and warm dark matter. We consider it alone and in combination with cold matter and with radiation, also obtaining closed-form solutions for the growth of super-horizon perturbations in each case. The idealized model recovers $t(a)$ to better than $1.5\%$ accuracy for all $a$ relative to a Fermi-Dirac distribution (as describes neutrinos). We conclude by adding the second moment of the distribution to our exact solution and then generalizing to include all moments of an arbitrary momentum distribution in a closed form solution.Comment: 13 pages, 7 figures, MNRAS submitte

History and Outlook for Farm Bill Conservation Programs

Agricultural and Food Policy,

Excerpts from Television\u27s Greatest Hits and Other Stories

The short stories contained in this manuscript are mostly of the realist stripe, with a few concessions made to my more fabulist tendencies. Each is about men and women being forced to relive their old lives or finding themselves at the cusp of new ones, propositions which prove simultaneously attractive and repulsive. By the end of each story, it is my hope to transmit that the characters have survived somewhat intact, though reconstituted. There is a man in grief over the death of the wife he couldn’t stop cheating on, adults trick-or-treating at the expense of their children’s youths, a young woman who obsesses after a high school crush post-divorce. Former enfant terribles get the band back together for reasons that compromise their ethos. Best friends disappear into thin air. A young man is forced to face the consequences of his tendencies toward historical revisionism in his art. An all-night lock-in at a skating rink serves as the venue for confrontations intimate and violent. Ultimately, my hope is that these stories say something about desperate people and what happens when our nostalgia is brought into conflict with the inevitability of aging, the things we create, and how others see us

WHERE DOES MENTORING MATTER MOST? TEACHERS’ PERCEPTIONS OF BEING MENTORED DURING THEIR FIRST YEAR OF TEACHING AND THE CORRELATION OF THOSE PERCEPTIONS WITH JOB SATISFACTION AMONG ECONOMICALLY DIVERSE SCHOOLS

In this quantitative study, the researcher explored the relationships between new teacher mentoring and job satisfaction. Although many studies have been conducted on the link between new teacher mentoring and job satisfaction, there exists little research on whether or not there are specific mentoring activities that correlate more strongly with job satisfaction. In addition to filling that gap in the research, this study examined the extent to which job satisfaction is correlated with both mentoring activities and the mentoring relationship. Over 600 teachers across nine districts plus a regional center on Long Island were surveyed. The schools surveyed had varying percentages of economically disadvantaged students. Using both Seligman’s (1972) theory of learned helplessness and Ingersoll and Strong’s (2011) theory of teacher development as frameworks, this study developed an understanding of the frequency of specific activities in which mentors and mentees engage and if said activities correlate with job satisfaction. The results in this study indicated few significant differences in mentor-mentee activities across varying degrees of economically disadvantaged schools. Moreover, the study found that the following three activities had the strongest correlation with job satisfaction among early-career teachers: understanding the school’s evaluation process, time management, and understanding of curriculum. Finally, it was determined that, in general, the strength of the mentor-mentee relationship is more strongly correlated with job satisfaction than any of the specific activities in which mentors and mentees engage. The results could help inform both mentors and trainers of mentors, and the recommendations that were made are intended to build confidence and optimism in new teachers, thus potentially leading to higher teacher retention, and, ultimately, improved student outcomes

Voices of the Exhibition:The Rise of Ekphrasis During the 20th Century Through Imagism and Visual Art Museums

The purpose of this research is to identify main causes for the expansion of ekphrastic poetry during the 20th century and how it became a more widely used genre. The goal is to show how ekphrasis contributed to the growth of the interdisciplinary partnership between museums and poets. By evaluating two factors that led to a growing interest in the genre and increased accessibility to poetry and the visual arts. This is done by looking at ekphrastic work by Imagist poets like Ezra Pound, Richard Aldington and H.D. as well as the growth of 20th century museum accessibility and educational practices. The expansion of ekphrasis resulted in a wider exposure to poetry, the visual arts and museums. Ekphrasis assisted in accomplishing mutual goals of exposing and educating the public to both mediums, which resulted in better understanding of the genre and its influence on museums throughout the 20th century

Symptom management in amyotrophic lateral sclerosis: We can do better

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141321/1/mus25740_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/141321/2/mus25740.pd