Alien Registration- Johnson, Ida (Sanford, York County)

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Saturated torque formula for planetary migration in viscous disks with thermal diffusion: recipe for protoplanet population synthesis

We provide torque formulae for low mass planets undergoing type I migration in gaseous disks. These torque formulae put special emphasis on the horseshoe drag, which is prone to saturation: the asymptotic value reached by the horseshoe drag depends on a balance between coorbital dynamics (which tends to cancel out or saturate the torque) and diffusive processes (which tend to restore the unperturbed disk profiles, thereby desaturating the torque). We entertain here the question of this asymptotic value, and we derive torque formulae which give the total torque as a function of the disk's viscosity and thermal diffusivity. The horseshoe drag features two components: one which scales with the vortensity gradient, and one which scales with the entropy gradient, and which constitutes the most promising candidate for halting inward type I migration. Our analysis, which is complemented by numerical simulations, recovers characteristics already noted by numericists, namely that the viscous timescale across the horseshoe region must be shorter than the libration time in order to avoid saturation, and that, provided this condition is satisfied, the entropy related part of the horseshoe drag remains large if the thermal timescale is shorter than the libration time. Side results include a study of the Lindblad torque as a function of thermal diffusivity, and a contribution to the corotation torque arising from vortensity viscously created at the contact discontinuities that appear at the horseshoe separatrices. For the convenience of the reader mostly interested in the torque formulae, section 8 is self-contained.Comment: Affiliation details changed. Fixed equation numbering issue. Biblio info adde

The moods of the elegy in Greek, Latin and English poetry

"If elegy be defined as a song of mourning, an attempt to trace fits history would be a difficult task and perhaps an man must have voiced arrow for the dead. In fact, there is no ancient literature free from some form of the dirge and the lament. The subject of this study, however, is not the sorrow-songs of all mankind, but the elegy, named and developed by the Greeks, given its own vehicle--the elegiac distich, broadened to cover many moods, taken over for the sensuous love-plaints of Rome, made teacher and preacher by the scholars of the Middle Ages, and reincarnate in modern English poetry; reincarnate, one may say, since the old name, elegy, with the old connotation, a song of mourning, has a definite place in our great literature."-Page

Elimination of common errors of speech by the individual method

This item was digitized by the Internet Archive. Thesis (Ed.M.)--Boston Universityhttps://archive.org/details/eliminationofcom00joh

The Effects of Intimate Relationship Education on Relationship Optimism and Attitudes toward Marriage

This study evaluated the effects of relationship education on undergraduate students\u27 optimism about relationships and attitudes toward marriage. Participants included undergraduate students enrolled in an Intimate and Family Relations class and students enrolled in a comparison class at the University of Montana. Students were assessed during the first week of the fall semester, 2008, and again at the conclusion of fall semester, 2008. Students\u27 attitudes and optimism towards marriage and intimate relationships were assessed using the Optimism about Relationships scale (Carnelly & Janoff-Bulman, 1992), the Family-of-Origin scale (Hovestadt, Anderson, Piercy, Cochran, & Fine, 1985), and the Marital Attitude Scale (Braaten & Rosèn, 1998). This study focused on whether taking an Intimate and Family Relations class had differential effects on students whose parents previously divorced as compared with students from non-divorced families. Analyses of covariance (ANCOVA) were used to determine assessment score differences from pre- to post-test between students in the Intimate and Family Relations class and students in the comparison class. Conclusions and recommendations for future research are provided

A Study of Speech Defects as Found Among Negro Elementary School Children of Jasper County

The purpose of this study is two-fold: First, to encourage the elementary teachers to make forward strides toward being prepared to help correct speech defects. Second, to stir the interest of teachers and school administrators to see to it that special teachers for speech handicapped children and other handicapped children be employed to serve the handicapped children in the elementary schools of Jasper County. This study will be confined to the Negro children of the Elementary Schools in Jasper County during the Scholastic year of 1949-50 and one special case during the writer\u27s experience as a Primary teacher, serving the Kirbyville Colored Elementary School before the scholastic year of 1949-50

Cultivating Trauma-Informed Spaces in Education: Promising Practices Manual

Cultivating Trauma-Informed Spaces in Education Promising Practices Manual is an outcome of a Sheridan Scholarship, Research, and Creative Activities Growth Grant. The project goal was to develop proactive measures to enhance student support, and safer learning experiences, and reduce trauma, re-traumatization, and vicarious trauma. The Manual is intended to support increased awareness of trauma and the importance of Trauma-Informed Education in post-secondary education. It includes a framework, including macro, mezzo, and micro level organizational recommendations and pedagogical practices. It is a tool to support educators and educational institutions, through a preventative and harm-reducing approach, to support more compassionate, supportive, equitable and flexible learning spaces and workplaces

3D MHD Simulations of Planet Migration in Turbulent Stratified Disks

We performed 3D MHD simulations of planet migration in stratified disks using the Godunov code PLUTO, where the disk is turbulent due to the magnetorotational instability. We study the migration for planets with different planet-star mass ratios $q=M_{p}/M_{s}$. In agreement with previous studies, for the low-mass planet cases ($q=5\times10^{-6}$ and $10^{-5}$), migration is dominated by random fluctuations in the torque. For a Jupiter-mass planet $(q=M_{p}/M_{s}=10^{-3}$ for $M_{s}=1M_{\odot})$, we find a reduction of the magnetic stress inside the orbit of the planet and around the gap region. After an initial stage where the torque on the planet is positive, it reverses and we recover migration rates similar to those found in disks where the turbulent viscosity is modelled by an $\alpha$ viscosity. For the intermediate-mass planets ($q=5\times10^{-5}, 10^{-4}$ and $2\times10^{-4}$) we find a new and so far unexpected behavior. In some cases they experience sustained and systematic outwards migration for the entire duration of the simulation. For this case, the horseshoe region is resolved and torques coming from the corotation region can remain unsaturated due to the stresses in the disk. These stresses are generated directly by the magnetic field. The magnitude of the horseshoe drag can overcome the negative Lindblad contribution when the local surface density profile is flat or increasing outwards, which we see in certain locations in our simulations due to the presence of a zonal flow. The intermediate-mass planet is migrating radially outwards in locations where there is a positive gradient of a pressure bump (zonal flow).Comment: Accepted for publication in Ap

A Substellar Companion in a 1.3 yr Nearly-circular Orbit of HD 16760

We report the detection of a substellar companion orbiting the G5 dwarf HD 16760 from the N2K sample. Precise Doppler measurements of the star from Subaru and Keck revealed a Keplerian velocity variation with a period of 466.47+-0.35 d, a semiamplitude of 407.71+-0.84 m/s, and an eccentricity of 0.084+-0.003. Adopting a stellar mass of 0.78+-0.05 M_Sun, we obtain a minimum mass for the companion of 13.13+-0.56 M_JUP, which is close to the planet/brown-dwarf transition, and the semimajor axis of 1.084+-0.023 AU. The nearly circular orbit despite the large mass and intermediate orbital period makes this companion unique among known substellar companions.Comment: 14 pages, 2 figures, accepted for publication in Ap