Using Geological Implications of a Physical Libration to Constrain Enceladus' Libration State

Observations of Enceladus' south pole revealed large rifts in the crust, called "tiger stripes", which exhibit higher temperatures than the surrounding terrain and are likely sources of observed eruptions. Tidal stress may periodically open the tiger stripe rifts, controlling the timing and location of eruptions. Moreover, shear motion along rifts may produce the heat to drive eruptions

A Penny for the Court\u27s Thoughts? The High Price of Judicial Elections

In this article, Mr. Bronson Bills explores the meaning of the term judicial independence, tracks the history of the concept in colonial America, and discusses the importance of judicial independence to free and just society. Mr. Bills then examines judicial elections in light of the 2006 Nevada Supreme Court election for Seat G-a judicial election in which the incumbent Justice Nancy Becker was defeated by the much less qualified Nevada State District Court Judge Nancy Saitta (who was the most reversed District Judge in Nevada with no academic or legal publications prior to taking the bench) after Saitta misrepresented the holding of a single unpopular civil tax decision, in which Becker concurred, to the voting public-and argues that the Nevada Supreme Court election illustrates many of the reasons why States should abandon elections in favor of judicial appointment

Liquid Fuel Film Cooling: a CFD Analysis With Hydrocarbon Fuel

Cooling of liquid rocket engine combustion chambers and nozzles is a critical component to liquid rocket engine design. A common method of cooling is liquid fuel film cooling. Liquid fuel is injected along the surface of the wall to act as a barrier against the core combustion gases. A numerical model is developed for simulating liquid fuel _lm cooling in a rocket engine using a hydrocarbon fuel. The model incorporates turbulent multiphase ow with species transport within the commercial ANSYS® Fluent CFD software. Conjugate heat transfer is simulated through walls containing embedded cooling channels. A novel User Defined Function is written to incorporate heterogeneous chemical reactions between the liquid fuel and the freestream gases. Comparisons are made between simulations with and without the heterogeneous reactions as well as with simplifications to the cooling channel geometry. It is found that simplifications to the cooling geometry can artificially reduce cooling performance while neglecting the heterogeneous reactions can artificially increase cooling performance

A Penny for the Court\u27s Thoughts? The High Price of Judicial Elections

In this article, Mr. Bronson Bills explores the meaning of the term judicial independence, tracks the history of the concept in colonial America, and discusses the importance of judicial independence to free and just society. Mr. Bills then examines judicial elections in light of the 2006 Nevada Supreme Court election for Seat G-a judicial election in which the incumbent Justice Nancy Becker was defeated by the much less qualified Nevada State District Court Judge Nancy Saitta (who was the most reversed District Judge in Nevada with no academic or legal publications prior to taking the bench) after Saitta misrepresented the holding of a single unpopular civil tax decision, in which Becker concurred, to the voting public-and argues that the Nevada Supreme Court election illustrates many of the reasons why States should abandon elections in favor of judicial appointment

Geological Implications of a Physical Libration on Enceladus

Given the non-spherical shape of Enceladus (Thomas et al., 2007), the satellite will experience gravitational torques that will cause it to physically librate as it orbits Saturn. Physical libration would produce a diurnal oscillation in the longitude of Enceladus tidal bulge which, could have a profound effect on the diurnal stresses experienced by the surface of the satellite. Although Cassini ISS has placed an observational upper limit on Enceladus libration amplitude of F < 1.5deg (Porco et al., 2006), smaller amplitudes can still have geologically significant consequences. Here we present the first detailed description of how physical libration affects tidal stresses and how those stresses then might affect geological processes including crack formation and propagation, south polar eruption activity, and tidal heating. Our goal is to provide a framework for testing the hypothesis that geologic features on Enceladus are produced by tidal stresses from diurnal physical and optical librations of the satellite

New Mexican Spanish: A Brief History of Time, Space, and Family Values

2010 Plenary Addres

All eyes on the spiny mouse: an investigation into Acomys dimidiatus as a model for retinal biology and regeneration

The retina is a complex tissue with six types of neurons, supported by an intrinsic glia cell, that work in concert to input a visual stimulus and relay a visual message to the brain. Efficient communication between neurons is vital to this process and each neuron plays a significant role in vision. When retinal neurons degenerate, that visual signal is lost. Degenerative eye diseases affect the neurons of the retina in millions of people world-wide and can ultimately lead to blindness. While treatments are evolving, most are designed to prevent further damage; the field has yet to piece together how to reverse the damage or regenerate lost neurons. Unlocking the key to neuron regeneration could restore vision. Decades of research have been dedicated to studying the mechanisms of retinal regeneration, but much is unknown. The current animal models have contributed significantly towards this goal, however, currently there is no published reports of a mammal that can regenerate retinal neurons. Identifying a mammal with a propensity for regeneration might help further the goal of restoring vision loss in retinal regenerative disease. Spiny mice (genus Acomys) include over 15 species and are small desert rodents residing throughout Africa, the Middle East, and Southwest Asia. Several Acomys species have been reported to have regenerative abilities, a rare trait in mammals. Studies report their ability to regenerate each layer of skin, as well as the kidney, heart, and importantly, the spinal cord. This raises the question of whether they can regenerate retinal neurons. Accordingly, this dissertation describes the retinal neuroanatomy of the spiny mouse and investigates their response to retinal damage. Chapter 1 of this dissertation is an overview of retinal biology, disease and repair. Chapter 2 focuses on characterizing Acomys retinal neuroanatomy. In this work, I described their retinal organization and cell type composition for the first time, and established a panel of antibodies that reliably detect retinal cell types in Acomys. Chapter 3 focuses on the regenerative potential of Acomys. I show that after damage to retinal neurons, Acomys mounts a pro-regenerative response that is characterized by increased cell proliferation, reduced fibrosis, and expression of factors associated with retinal regeneration. Finally, Chapter 4 provides an in-depth discussion of my results, ideas for future studies, and places my work within the broader context of the retinal regeneration field

The Dawn Gravity Investigation at Vesta and Ceres

The objective of the Dawn gravity investigation is to use high precision X-band Doppler tracking and landmark tracking from optical images to measure the gravity fields of Vesta and Ceres to a half-wavelength surface resolution better than 90-km and 300-km, respectively. Depending on the Doppler tracking assumptions, the gravity field will be determined to somewhere between harmonic degrees 15 and 25 for Vesta and about degree 10 for Ceres. The gravity fields together with shape models determined from Dawn's framing camera constrain models of the interior from the core to the crust. The gravity field is determined jointly with the spin pole location. The second degree harmonics together with assumptions on obliquity or hydrostatic equilibrium may determine the moments of inertia

1938: Abilene Christian College Bible Lectures - Full Text

Delivered in the Auditorium of Abilene Christian College, February, 1938 Abilene, Texas. Published October, 1939 PRICE, $1.00 FIRM FOUNDATION PUBLISHING HOUSE Austin, Texas