Effective zero-dimensionality for computable metric spaces

We begin to study classical dimension theory from the computable analysis (TTE) point of view. For computable metric spaces, several effectivisations of zero-dimensionality are shown to be equivalent. The part of this characterisation that concerns covering dimension extends to higher dimensions and to closed shrinkings of finite open covers. To deal with zero-dimensional subspaces uniformly, four operations (relative to the space and a class of subspaces) are defined; these correspond to definitions of inductive and covering dimensions and a countable basis condition. Finally, an effective retract characterisation of zero-dimensionality is proven under an effective compactness condition. In one direction this uses a version of the construction of bilocated sets.Comment: 25 pages. To appear in Logical Methods in Computer Science. Results in Section 4 have been presented at CCA 201

Beyond the Gutenberg Parenthesis: Exploring New Paradigms in Media and Learning

There are those who agree with Tom Pettitt that we are entering into a period where text based literacy is no longer the only measure of intelligence, nor is it the only form of valuable communications and knowledge acquisition for today’s media-centric children. As Prensky states, today’s youth speak ‘digital’ as their primary language. While his comments may be tempered by the fact that they are based on personal observation and correspondence with others, Prensky does make a point. In order to reach these children and stimulate their interest in reading and writing, it may be better to being by teaching to their strengths and if digital is the basis of those skills, then starting with digital media has considerable merit. This paper presents the some of the foundations behind Jenkins’ premise that remixing and appropriation of previously created works is a valid first step in the learning process. The authors suggest that mixing media with story invention creates a learning environment of considerable power. The paper also discusses a series of related studies in which these hypotheses were investigated and a few words about the ramifications these results may have on future studies in this area

Tracing the History of Grounded Theory Methodology: From Formation to Fragmentation

There are very few articles, which track the history of Grounded Theory (GT) methodology from its tentative conception to its present divisions. This journal article addresses the dearth by tracing the history of GT methodology from its conception in the 1960’s, discussing the context of its composition, character, and contribution. Subsequently, the article follows the maturation of GT which is characterised by a series of contentious and, at times, antagonistic academic debates. The crux of these debates centres on disputes over core tenets of GT and have resulted in three dominant and divergent configurations of the GT methodology: Classic, Straussian, and Constructivist GT. These factions can often create confusion for the researcher wishing to embark on a GT study. However, an examination of the history of the GT methodology sheds light on the logic of these schisms

Contrasting Classic, Straussian, and Constructivist Grounded Theory: Methodological and Philosophical Conflicts

Grounded Theory (GT) is an innovative research methodology, consisting of three prevailing traditions: Classic, Straussian, and Constructivist GT. Despite arising from the same root, and sharing a number of the original methodological techniques, Classic, Straussian, and Constructivist GT have nevertheless diverged to such an extent that they are neither homogenous nor interchangeable methodologies. They are differentiated by contrasting philosophical frameworks and conflicting methodological directives. Through a careful analysis of the literature, the authors propose that the incongruity of the three GT traditions hinges on three principal and paramount demarcations: Firstly, their contending coding procedures; secondly, their opposing philosophical positions; and thirdly, their conflicting use of literature. The authors argue that these three areas of contention represent the quintessential distinction between the three GT traditions. Accordingly, this article will illustrate and contrast the contending coding conventions, uncover the underlying philosophical positions, and explore the contrasting uses of literature embedded within Classic, Straussian, and Constructivist GT

Improved Limits on Sterile Neutrino Dark Matter using Full-Sky Fermi Gamma-Ray Burst Monitor Data

A sterile neutrino of ~keV mass is a well motivated dark matter candidate. Its decay generates an X-ray line that offers a unique target for X-ray telescopes. For the first time, we use the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-Ray Space Telescope to search for sterile neutrino decay lines; our analysis covers the energy range 10-25 keV (sterile neutrino mass 20-50 keV), which is inaccessible to X-ray and gamma-ray satellites such as Chandra, Suzaku, XMM-Newton, and INTEGRAL. The extremely wide field of view of the GBM enables a large fraction of the Milky Way dark matter halo to be probed. After implementing careful data cuts, we obtain ~53 days of full sky observational data. We observe an excess of photons towards the Galactic Center, as expected from astrophysical emission. We search for sterile neutrino decay lines in the energy spectrum, and find no significant signal. From this, we obtain upper limits on the sterile neutrino mixing angle as a function of mass. In the sterile neutrino mass range 25-40 keV, we improve upon previous upper limits by approximately an order of magnitude. Better understanding of detector and astrophysical backgrounds, as well as detector response, will further improve the sensitivity of a search with the GBM.Comment: 16 pages, 11 figures, references added, discussion expanded, some typos fixed, matches the published versio

PENGARUH KONVERGENSI IFRS, PROBABILITAS KEBANGKRUTAN, DAN PENERAPAN GOOD CORPORATE GOVERNANCE TERHADAP KETEPATWAKTUAN PENYAMPAIAN LAPORAN KEUANGAN (Studi Pada Perusahaan Tambang yang Terdaftar di Bursa Efek Indonesia Periode 2009-2013)

Penelitian ini bertujuan untuk mengetahui pengaruh Konvergensi IFRS, Probabilitas Kebangkrutan, Komite Audit, Komisaris Independen, dan Kualitas Audit secara bersama-sama maupun secara sendiri-sendiri terhadap Ketepatwaktuan Penyampaian Laporan Keuangan pada perusahaan tambang yang terdaftar di BEI periode 2009-2013. Populasi dalam penelitian ini adalah perusahaan tambang yang terdaftar di BEI periode 2009-2013 yaitu sebanyak 42 perusahaan setiap tahun dan sampel sebanyak 8 perusahaan setiap tahun dengan total 40 sampel untuk 5 tahun penelitian. Data penelitian merupakan data sekunder dan diteliti menggunakan metode dokumentasi. Sebelum dilakukan analisis data terlebih dahulu diadakan pengujian prasyarat analisis yang meliputi uji multikolinearitas. Metode analisis data adalah analisis regresi logistik sederhana dan berganda, dengan tingkat standar signifikansi yang telah ditentukan sebelumnya yaitu sebesar 0,05. Hasil penelitian menunjukkan bahwa: 1) Konvergensi IFRS tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,206 atau > 0,05; 2) Probabilitas Kebangkrutan tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,197 atau > 0,05; 3) Komite Audit tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,367 atau > 0,05; 4) Komisaris Independen tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,371 atau > 0,05; 5) Kualitas Audit tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,998 atau > 0,05; 6) Konvergensi IFRS, Probabilitas Kebangkrutan, Komite Audit, Komisaris Independen, dan Kualitas Audit secara bersama-sama tidak memiliki pengaruh signifikan terhadap Ketepatwaktuan Penyampaian Laporan Keuangan, dibuktikan dengan tingkat signifikansi sebesar 0,304 atau > 0,05. Kata kunci: Ketepatwaktuan Penyampaian Laporan Keuangan, Konvergensi IFRS, Probabilitas Kebangkrutan, Komite Audit, Komisaris Independen, Kualitas Audit

Magnetic Noise from Metal Objects near Qubit Arrays

All metal objects support fluctuating currents that are responsible for evanescent-wave Johnson noise in their vicinity due both to thermal and quantum effects. The noise fields can decohere qubits in their neighborhood. It is quantified by the average value of $B(x,t)B(x',t')$ and its time Fourier transform. We develop the formalism particularly for objects whose dimensions are small compared with the skin depth, which is the appropriate regime for nanoscale devices. This leads to a general and surprisingly simple formula for the noise correlation function of an object of arbitrary shape. This formula has a clear physical interpretation in terms of induced currents in the object. It can also be the basis for straightforward numerical evaluation. For a sphere, a solution is given in closed form in terms of a generalized multipole expansion. Plots of the solution illustrate the physical principles involved. We give examples of how the spatial pattern of noise can affect quantum information processing in nearby qubits. The theory implies that if the qubit system is miniaturized to a scale $D$, then decoherence rates of qubits scale as $1/D$.Comment: 12 pages, 8 figure

Flux-Based Deadbeat Control of Induction-Motor Torque

An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages. The prior methods are based on the use of stator flux and stator current as state variables, leading to mathematical solutions of control equations in forms that do not lend themselves to clear visualization of solution spaces. In contrast, the use of rotor and stator fluxes as the state variables in the present improved method lends itself to graphical representations that aid in understanding possible solutions under various operating conditions. In addition, the present improved method incorporates the superposition of high-frequency carrier signals for use in a motor-self-sensing technique for estimating the rotor shaft angle at any speed (including low or even zero speed) without need for additional shaft-angle-measuring sensors

Using Recovery Coaches in Substance Use Disorder Treatment

A Recovery Coach is a person who helps remove the personal and environmental obstacles to recovery, links the newly recovering person to the recovering community and serves as a personal guide and mentor in the management of personal and family recovery. In this webinar you will learn what motivational interviewing is and how it aids in the change process and communicates acceptance. Rich and Rob will present an overview of the Recovery Coaching program at the University of Massachusetts Medical Center. They will also share the data they have collected from their program about the use of recovery coaching in the treatment of substance use disorder. Learning Objectives: Learn about the UMassMemorial Medical Center’s Recovery Coaching program as a method to treat substance use disorder. Learn what motivational interviewing is and how to use motivational interviewing in goal-centered, and client-centered situations. Learn what is measured when evaluating whether recovery coaching is a successful treatment for substance use disorder. Understand the data that has been collected about the success of the Recovery Coaching program at the UMassMemorial Medical Center