Elliptic instability in the Lagrangian-averaged Euler-Boussinesq-alpha equations

We examine the effects of turbulence on elliptic instability of rotating stratified incompressible flows, in the context of the Lagragian-averaged Euler-Boussinesq-alpha, or \laeba, model of turbulence. We find that the \laeba model alters the instability in a variety of ways for fixed Rossby number and Brunt-V\"ais\"al\"a frequency. First, it alters the location of the instability domains in the $(\gamma,\cos\theta)-$parameter plane, where $\theta$ is the angle of incidence the Kelvin wave makes with the axis of rotation and $\gamma$ is the eccentricity of the elliptic flow, as well as the size of the associated Lyapunov exponent. Second, the model shrinks the width of one instability band while simultaneously increasing another. Third, the model introduces bands of unstable eccentric flows when the Kelvin wave is two-dimensional. We introduce two similarity variables--one is a ratio of the Brunt-V\"ais\"al\"a frequency to the model parameter $\Upsilon_0 = 1+\alpha^2\beta^2$, and the other is the ratio of the adjusted inverse Rossby number to the same model parameter. Here, $\alpha$ is the turbulence correlation length, and $\beta$ is the Kelvin wave number. We show that by adjusting the Rossby number and Brunt-V\"ais\"al\"a frequency so that the similarity variables remain constant for a given value of $\Upsilon_0$, turbulence has little effect on elliptic instability for small eccentricities $(\gamma \ll 1)$. For moderate and large eccentricities, however, we see drastic changes of the unstable Arnold tongues due to the \laeba model.Comment: 23 pages (sigle spaced w/figure at the end), 9 figures--coarse quality, accepted by Phys. Fluid

Balloon occlusion retrograde transvenous obliteration of gastric varices in two non-cirrhotic patients with portal vein thrombosis

This report describes two non-cirrhotic patients with portal vein thrombosis who underwent successful balloon occlusion retrograde transvenous obliteration (BRTO) of gastric varices with a satisfactory response and no complications. One patient was a 35-year-old female with a history of Crohn's disease, status post-total abdominal colectomy, and portal vein and mesenteric vein thrombosis. The other patient was a 51-year-old female with necrotizing pancreatitis, portal vein thrombosis, and gastric varices. The BRTO procedure was a useful treatment for gastric varices in non-cirrhotic patients with portal vein thrombosis in the presence of a gastrorenal shunt

Alaska Victimization Survey: 2011 Results for Bristol Bay

This is a handout of a Powerpoint slide presentation providing an overview of key results from the 2011 Alaska Victimization Survey for the Bristol Bay region, which was conducted from April to June 2011, with results released on October 12, 2011 in Dillingham. Findings include: * Over 50% of adult women in the Bristol Bay Region have experienced intimate partner violence, sexual violence or both, in their lifetime; * Nearly 15% have experienced intimate partner violence, sexual violence or both, in the past year; * 3 out of every 10 adult women in the Bristol Bay Region have experienced sexual violence in their lifetime; and * 4 out of every 10 have experienced intimate partner violence in their lifetime.Council on Domestic Violence and Sexual Assault, Alaska Department of Public SafetyAlaska Victimization Survey in Bristol Bay / Intimate Partner Violence Definitions / Intimate Partner Violence Estimates / Sexual Violence Definitions / Sexual Violence Estimates / Summary of Past Year Estimates / Summary of Lifetime Estimates / Lifetime Estimates / Important Limitations / A Special Thank You! / Contact

Piloting Multimodal Learning Analytics using Mobile Mixed Reality in Health Education

© 2019 IEEE. Mobile mixed reality has been shown to increase higher achievement and lower cognitive load within spatial disciplines. However, traditional methods of assessment restrict examiners ability to holistically assess spatial understanding. Multimodal learning analytics seeks to investigate how combinations of data types such as spatial data and traditional assessment can be combined to better understand both the learner and learning environment. This paper explores the pedagogical possibilities of a smartphone enabled mixed reality multimodal learning analytics case study for health education, focused on learning the anatomy of the heart. The context for this study is the first loop of a design based research study exploring the acquisition and retention of knowledge by piloting the proposed system with practicing health experts. Outcomes from the pilot study showed engagement and enthusiasm of the method among the experts, but also demonstrated problems to overcome in the pedagogical method before deployment with learners

Alaska Victimization Survey: From Research to Policy and Practice

This project was supported by the Alaska Council on Domestic Violence and Sexual Assault. Points of view in this document are those of the authors and do not necessarily represent the official position or policies of the Council, the Alaska Department of Public Safety, or the State of Alaska.The Justice Center at the University of Alaska Anchorage partnered with the Council on Domestic Violence and Sexual Assault to conduct a statewide victimization survey. The Alaska Victimization Survey was modeled after the National Intimate Partner and Sexual Violence Surveillance System (NISVSS) survey, developed by the Centers for Disease Control and Prevention in collaboration with the National Institute of Justice and the Department of Defense. The NISVSS survey is designed to “generate accurate and reliable lifetime and 12-month incidence and prevalence estimates on intimate partner violence (physical aggression, psychological aggression, and sexual violence); sexual violence (unwanted sexual situations, abusive sexual contact, and completed or attempted sex without consent); and stalking” (CDC). This poster presents key results from the Alaska Victimization Survey and identifies how survey results are being used to impact policy and practice.Council on Domestic Violence and Sexual Assault, Alaska Department of Public SafetyAbstract / UCR Forcible Rape Statistice: 1996–2009 / Survey Methods / Measures / Results / Dissemination / Impact on Policy & Practic

Word Transposability

The transposability of a word can be defined as the ease with which its letters can be rearranged to form another word. This can be quanitified in two ways -- the number of different words into which the letters can be rearranged, and their rarity. As demonstrated by Dmitri Borgmann in Elementary Transpositions in the August 1978 Word Ways, it is usually possible to transpose a word if one is willing to stretch the concept of a word to its outer limits (and beyond)

Detection of the spin character of Fe(001) surface states by scanning tunneling microscopy: A theoretical proposal

We consider the magnetic structure on the Fe(001) surface and theoretically study the scanning tunneling spectroscopy using a spin-polarized tip (SP-STM). We show that minority-spin surface states induce a strong bias dependence of the tunneling differential conductance which largely depends on the orientation of the magnetization in the SP-STM tip relative to the easy magnetization axis in the Fe(001) surface. We propose to use this effect in order to determine the spin character of the Fe(001) surface states. This technique can be applied also to other magnetic surfaces in which surface states are observed.Comment: 5 pages, 4 figure

Parallel asynchronous hardware implementation of image processing algorithms

Research is being carried out on hardware for a new approach to focal plane processing. The hardware involves silicon injection mode devices. These devices provide a natural basis for parallel asynchronous focal plane image preprocessing. The simplicity and novel properties of the devices would permit an independent analog processing channel to be dedicated to every pixel. A laminar architecture built from arrays of the devices would form a two-dimensional (2-D) array processor with a 2-D array of inputs located directly behind a focal plane detector array. A 2-D image data stream would propagate in neuron-like asynchronous pulse-coded form through the laminar processor. No multiplexing, digitization, or serial processing would occur in the preprocessing state. High performance is expected, based on pulse coding of input currents down to one picoampere with noise referred to input of about 10 femtoamperes. Linear pulse coding has been observed for input currents ranging up to seven orders of magnitude. Low power requirements suggest utility in space and in conjunction with very large arrays. Very low dark current and multispectral capability are possible because of hardware compatibility with the cryogenic environment of high performance detector arrays. The aforementioned hardware development effort is aimed at systems which would integrate image acquisition and image processing

Ground Support for the Space-Based Range Flight Demonstration 2

The primary objective of the NASA Space-Based Range Demonstration and Certification program was to develop and demonstrate space-based range capabilities. The Flight Demonstration 2 flights at NASA Dryden Flight Research Center were conducted to support Range Safety (commanding and position reporting) and high-rate (5 Mbps) Range User (video and data) requirements. Required ground support infrastructure included a flight termination system computer, the ground-data distribution network to send range safety commands and receive range safety and range user telemetry data and video, and the ground processing systems at the Dryden Mission Control Center to process range safety and range user telemetry data and video