Tilt, Warp, and Simultaneous Precessions in Disks

Warps are suspected in disks around massive compact objects. However, the proposed warping source -- non-axisymmetric radiation pressure -- does not apply to white dwarfs. In this letter we report the first Smoothed Particle Hydrodynamic simulations of accretion disks in SU UMa-type systems that naturally tilt, warp, and simultaneously precess in the prograde and retrograde directions using white dwarf V344 Lyrae in the Kepler field as our model. After ~79 days in V344 Lyrae, the disk angular momentum L_d becomes misaligned to the orbital angular momentum L_o. As the gas stream remains normal to L_o, hydrodynamics (e.g., the lift force) is a likely source to disk tilt. In addition to tilt, the outer disk annuli cyclically change shape from circular to highly eccentric due to tidal torques by the secondary star. The effect of simultaneous prograde and retrograde precession is a warp of the colder, denser midplane as seen along the disk rim. The simulated rate of apsidal advance to nodal regression per orbit nearly matches the observed ratio in V344 Lyrae.Comment: 3 figures, Lette

A Generalized Montgomery Phase Formula for Rotating Self Deforming Bodies

We study the motion of self deforming bodies with non zero angular momentum when the changing shape is known as a function of time. The conserved angular momentum with respect to the center of mass, when seen from a rotating frame, describes a curve on a sphere as it happens for the rigid body motion, though obeying a more complicated non-autonomous equation. We observe that if, after time $\Delta T$, this curve is simple and closed, the deforming body \'{}s orientation in space is fully characterized by an angle or phase $\theta_{M}$. We also give a reconstruction formula for this angle which generalizes R. Montgomery\'{}s well known formula for the rigid body phase. Finally, we apply these techniques to obtain analytical results on the motion of deforming bodies in some concrete examples.Comment: 20 page

Congregation Beth Ahabah: Sabbath Service

Student perspectives on worship services from Instructor Jennifer Garvin-Sanchez\u27s Religious Studies 108 Human Spirituality course at Virginia Commonwealth University

Body Image and Disordered Eating Among UAF Female Athletes and Non-Athletes

•Disordered eating and poor body image is a problem in our society for many women •Most eating disorder patients are young females, and female athletes may be particularly at risk •Disordered eating is often associated with perfectionism, poor mental health, and other health-risk behaviors •This research explored associations between eating behavior, body image, perfectionism, depression, binge drinking, and alcohol consequences in a sample of female athletes and non-athletes •Analyses were conducted to determine differences in these variables between athletes and non-athletes, and between sports in the subsample of athlete

Teensites.com: A Field Guide to the New Digital Landscape

A 2001 report from the Center for Media Education, provided here as background to work produced by Kathryn Montgomery after coming to American University and CSM (see http://www.centerforsocialmedia.org/resources/publications/ecitizens/index2.htm -- Youth as E-Citizens'), surveys the burgeoning digital media culture directed at -- and in some cases created by -- teens.This report surveys the burgeoning new media culture directed at -- and in some cases created by -- teens. TeenSites.com -- A Field Guide to the New Digital Landscape examines the uniquely interactive nature of the new media, and explores the ways in which teens are at once shaping and being shaped by the electronic culture that surrounds them

Ekoji Buddhist Sangha: The Richmond Meditative Inquiry Group

Student perspectives on worship services from Instructor Jennifer Garvin-Sanchez\u27s Religious Studies 108 Human Spirituality course at Virginia Commonwealth University