Physical Sciences and Mathematics Commons^™

Grb 091024a And The Nature Of Ultra-Long Gamma-Ray Bursts, F. J. Virgili, C. G. Mundell, V. Pal'shin, C. Guidorzi, R. Margutti, A. Melandri, R. Harrison, S. Kobayashi, R. Chornock, A Henden, A C. Updike, S B. Cenko, N R. Tanvir, I A. Steele, A Cucchiara, A Gomboc, A Levan, Z Cano, C J. Mottram, N R. Clay, D Bersier, D Kopac, J Japelj, A V. Filippenko, W Li, D Svinkin, S Golenetskii, Dieter H. Hartmann, P A. Milne, G Williams, P T. O'Brien, D B. Fox, E Berger

Publications

We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus–Wind (KW), Swift, and Fermi, GRB 091024A has prompt emission episodes covering ∼1300 s, accompanied by bright and highly structured optical emission captured by various rapid-response facilities, including the 2 m autonomous robotic Faulkes North and Liverpool Telescopes, KAIT, S-LOTIS, and the Sonoita Research Observatory. We also observed the burst with 8 and 10 m class telescopes and determine the redshift to be z = 1.0924 ± 0.0004. We find no correlation between the optical and γ-ray …

Defending Against Heap Overflow By Using Randomization In Nested Virtual Clusters, Chee Meng Tey, Debin Gao

Research Collection School Of Computing and Information Systems

Heap based buffer overflows are a dangerous class of vulnerability. One countermeasure is randomizing the location of heap memory blocks. Existing techniques segregate the address space into clusters, each of which is used exclusively for one block size. This approach requires a large amount of address space reservation, and results in lower location randomization for larger blocks.

Jefferson Currents: Autumn 2013

Jefferson Currents: The Energy Conservation Newsletter

Dr. Watts' Brilliant Savings: And now, for something completely different, ladies and gentlemen, with a roll of the drums and a blare of trumpets, please..

On the Home Front: Rudolph-approved!

Bright Ideas: A kilowatt saved is a penny earned

Jefferson Currents: Spring 2013

Jefferson Currents: The Energy Conservation Newsletter

Dr. Watts' Brilliant Savings: Here Comes the Bride

On the Home Front: Insulation or How I learned to stuff it

Bright Ideas: The heat's ON but no one's home!

U.S. Drought Monitor, November 19, 2013, Richard R. Heim Jr.

United States Agricultural Commodities in Drought Archive

Drought map of U.S. for November 19, 2013 (11/19/13) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.

Directed Search For Continuous Gravitational Waves From The Galactic Center, J. Aasi, J. Abadie, B. P. Abbott, R. Abbott, T. Abbott, M. R. Abernathy, T. Accadia, Marc Favata, Shaon Ghosh, Rodica Martin

Department of Physics and Astronomy Faculty Scholarship and Creative Works

We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic center region, performed on two years of data from LIGO's fifth science run from two LIGO detectors. The search uses a semicoherent approach, analyzing coherently 630 segments, each spanning 11.5 hours, and then incoherently combining the results of the single segments. It covers gravitational wave frequencies in a range from 78 to 496 Hz and a frequency-dependent range of first-order spindown values down to -7.86×10-8 Hz/s at the highest frequency. No gravitational waves were detected. The 90% confidence upper limits …

Cyclometalated Iridium(Iii) Complexes With Deoxyribose Substituents, Ayan Maity, Jung-Suk Choi, Thomas S. Teets, Nihal Deligonul, Anthony J. Berdis, Thomas G. Gray

Chemistry Faculty Publications

Fundamental study of enzymatic nucleoside transport suffers for lack of optical probes that can be tracked noninvasively. Nucleoside transporters are integral membrane glycoproteins that mediate the salvage of nucleosides and their passage across cell membranes. The substrate recognition site is the deoxyribose sugar, often with little distinction among nucleobases. Reported here are nucleoside analogues in which emissive, cyclometalated iridium(III) complexes are “clicked” to C-1 of deoxyribose in place of canonical nucleobases. The resulting complexes show visible luminescence at room temperature and 77 K with microsecond-length triplet lifetimes. A representative complex is crystallographically characterized. Transport and luminescence are demonstrated in cultured …

Mapping Of The Quasi-Periodic Oscillations At The Flank Magnetopause Into The Ionosphere, E. R. Dougal, K. Nykyri, T. W. Moore

Publications

We have estimated the ionospheric location, area, and travel time of quasi-periodic oscillations originating from the magnetospheric flanks. This was accomplished by utilizing global and local MHD models and Tsyganenko semi-empirical magnetic field model on multiple published and four new cases believed to be caused by the Kelvin– Helmholtz Instability. Finally, we used auroral, magnetometer, and radar instruments to observe the ionospheric signatures. The ionospheric magnetic latitude determined using global MHD and Tsyganenko models ranged from 58.3–80.2 degrees in the Northern Hemisphere and −59.6 degrees to −83.4 degrees in the Southern Hemisphere. The ionospheric magnetic local time ranged between 5.0–13.8 …

Response Adaptive Design Using Auxiliary And Primary Outcomes, Shuxian Sinks

Theses and Dissertations

Response adaptive designs intend to allocate more patients to better treatments without undermining the validity and the integrity of the trial. The immediacy of the primary response (e.g. deaths, remission) determines the efficiency of the response adaptive design, which often requires outcomes to be quickly or immediately observed. This presents difficulties for survival studies, which may require long durations to observe the primary endpoint. Therefore, we introduce auxiliary endpoints to assist the adaptation with the primary endpoint, where an auxiliary endpoint is generally defined as any measurement that is positively associated with the primary endpoint. Our proposed design (referred to …

Directed Search For Continuous Gravitational Waves From The Galactic Center, J. Aasi, Daniel Bessis, Teviet Creighton, H. Daveloza, Mario C. Diaz, S. R. Morriss, Soma Mukherjee, W. Ortega Larcher, M. E. Normandin, Volker Quetschke, O. Puncken, Malik Rakhmanov, Joseph D. Romano, Robert Stone, A. S. Stroeer, Lappoon R. Tang, Cristina V. Torres, D. Vrinceanu

Physics and Astronomy Faculty Publications and Presentations

We present the results of a directed search for continuous gravitational waves from unknown, isolated neutron stars in the Galactic center region, performed on two years of data from LIGO’s fifth science run from two LIGO detectors. The search uses a semicoherent approach, analyzing coherently 630 segments, each spanning 11.5 hours, and then incoherently combining the results of the single segments. It covers gravitational wave frequencies in a range from 78 to 496 Hz and a frequency-dependent range of first-order spindown values down to −7.86×10−8  Hz/s at the highest frequency. No gravitational waves were detected. The 90% confidence upper limits …

Polynomially Adjusted Saddlepoint Density Approximations, Susan Zhe Sheng

Electronic Thesis and Dissertation Repository

This thesis aims at obtaining improved bona fide density estimates and approximants by means of adjustments applied to the widely used saddlepoint approximation. Said adjustments are determined by solving systems of equations resulting from a moment-matching argument. A hybrid density approximant that relies on the accuracy of the saddlepoint approximation in the distributional tails is introduced as well. A certain representation of noncentral indefinite quadratic forms leads to an initial approximation whose parameters are evaluated by simultaneously solving four equations involving the cumulants of the target distribution. A saddlepoint approximation to the distribution of quadratic forms is also discussed. By …

Investigation Of The Structure And Dynamics Of Regioisomeric Eu³⁺ And Gd³⁺ Chelates Of Nb-Dotma: Implications For Mri Contrast Agent Design, Benjamin Charles Webber

Dissertations and Theses

The detection of disease and abnormal pathology by magnetic resonance imaging (MRI) has been aided significantly by the use of gadolinium (Gd³⁺)-based contrast agents (CAs) over the past three decades. MRI and MRI CAs play a critical role in diagnosing tumors and diseases of the central nervous system. The agents used clinically have been shown to safely increase MRI contrast despite the toxicity of Gd³⁺, owing to the high kinetic and thermodynamic stability of these chelates. However, current CAs enhance contrast at a small fraction of what is theoretically possible. This leads to the necessity of …

Telling Stories With Web Archives, Michele C. Weigle

Computer Science Presentations

PDF of a powerpoint presentation from the Southeast Women in Computing Conference in Lake Guntersville State Park, Alabama, November 16, 2013. Also available on Slideshare.

Characterizing Expected Benefits Of Biomarkers In Treatment Selection, Ying Huang, Eric Laber, Holly Janes

UW Biostatistics Working Paper Series

Biomarkers associated with the treatment response heterogeneity hold potential for treatment selection. In practice, the decision regarding whether to adopt a treatment selection marker depends on the effect of treatment selection on the rate of targeted disease as well as additional cost associated with the treatment. We propose an expected benefit measure that incorporates both aspects to quantify a biomarker's treatment selection capacity. This measure extends an existing decision-theoretic framework, to account for the fact that optimal treatment absent marker information varies with the cost of treatment. In addition, we establish upper and lower bounds for the performance of a …

Poly (N-Isopropylacrylamide) Microgel-Based Etalons And Etalon Arrays For Determining The Molecular Weight Of Polymers In Solution, Molla R. Islam, Michael J. Serpe

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Positively and/or negatively charged poly (N-isopropylacrylamide)-based microgels were deposited on a single substrate and isolated regions of Au overlayers were deposited on top of the microgels. Each spatially isolated Au overlayer region had a different thickness to make an etalon array.We found that areas with a thin Au overlayer (5 nm) responded to a range of polymer molecular weights (MW), while areas with a thick overlayer (35 nm) can only respond to low molecular weight polyelectrolytes. By comparing the optical responses of the device’s individual array elements, a good approximation of the polyelectrolyteMWin solution can be made.

Recreational Angler Perspectives Of Nonnative Fish Species And Mercury Advisories, Christopher J. Edwards

FIU Electronic Theses and Dissertations

The central Everglades serve as a Wildlife Management Area and as a Water Conservation Area for the Miami-Fort Lauderdale metropolitan area. It is also home to over 22 nonnative freshwater fish species and carries restrictive fish consumption guidelines for Mercury. In my study, boat anglers and canal bank anglers were personally interviewed in the field, to research their awareness and perspectives of these potential environmental and health threats. The study found 78% of anglers were aware of the presence of nonnative fish species, but favored native fish species, and that 69% were aware of mercury advisories, but did not eat …

Directed Ratchet Transport In Granular Crystals, Vincent Berardi, J. Lydon, P. G. Kevrekidis, C. Daraio, R. Carretero-González

Psychology Faculty Articles and Research

Directed-ratchet transport (DRT) in a one-dimensional lattice of spherical beads, which serves as a prototype for granular chains, is investigated. We consider a system where the trajectory of the central bead is prescribed by a biharmonic forcing function with broken time-reversal symmetry. By comparing the mean integrated force of beads equidistant from the forcing bead, two distinct types of directed transport can be observed—spatial and temporal DRT. Based on the value of the frequency of the forcing function relative to the cutoff frequency, the system can be categorized by the presence and magnitude of each type of DRT. Furthermore, we …

Resonant Enhancement Of The Harmonic-Generation Spectrum Of Beryllium, Jean Marcel Ngoko Djiokap, Anthony F. Starace

Anthony F. Starace Publications

The high-order harmonic-generation (HHG) spectrum of Be is investigated in the multiphoton regime by solving the full-dimensional, two-active-electron, time-dependent Schr¨odinger equation in an intense (≈10¹³ W/cm²), 30-cycle laser field. As the laser frequency ω_L varies from 1.7 to 1.8 eV (which is in the tunable range of a Ti:sapphire laser), the seventh harmonic becomes resonant sequentially with the transition between the ground state and two doubly excited autoionizing states, 2p4s(¹P) (at ω_L = 1.734 eV) and 2p5s …

Kinetic Fractionation Of Gases By Deep Air Convection In Polar Firn, K. Kawamura, J. P. Severinghaus, M. R. Albert, Z. R. Courville

Dartmouth Scholarship

A previously unrecognized type of gas fractiona- tion occurs in firn air columns subjected to intense convec- tion. It is a form of kinetic fractionation that depends on the fact that different gases have different molecular diffusivi- ties. Convective mixing continually disturbs diffusive equi- librium, and gases diffuse back toward diffusive equilibrium under the influence of gravity and thermal gradients. In near- surface firn where convection and diffusion compete as gas transport mechanisms, slow-diffusing gases such as krypton (Kr) and xenon (Xe) are more heavily impacted by convec- tion than fast diffusing gases such as nitrogen (N2) and ar- gon …

Hardware Acceleration Technologies In Computer Algebra: Challenges And Impact, Sardar Anisul Haque

Electronic Thesis and Dissertation Repository

The objective of high performance computing (HPC) is to ensure that the computational power of hardware resources is well utilized to solve a problem. Various techniques are usually employed to achieve this goal. Improvement of algorithm to reduce the number of arithmetic operations, modifications in accessing data or rearrangement of data in order to reduce memory traffic, code optimization at all levels, designing parallel algorithms to reduce span are some of the attractive areas that HPC researchers are working on. In this thesis, we investigate HPC techniques for the implementation of basic routines in computer algebra targeting hardware acceleration technologies. …

Development Of Biodegradable And Stimuli-Responsive Macromolescules And Their Assemblies, Ali Nazemi

Electronic Thesis and Dissertation Repository

Polymersomes are potentially multifunctional soft materials constructed by the self-assembly of amphiphilic block copolymers in aqueous medium. While much research has focused on controlling the assembly and encapsulation properties of polymersomes, their surface functionalization has been relatively unexplored. This is important because it plays a critical role in determining their properties such as toxicity and biodistribution behavior. The work described in this thesis involves the development of a biocompatible and biodegradable polymersome systems based on poly(ethylene oxide)-b-polycaprolactone (PEO-PCL) block copolymers with azide surface groups as a novel scaffold for various biomedical applications. The surface functionalization of these polymersomes …

Climate Change And Household Dynamics: Beyond Consumption, Unbounding Sustainability, Chris Gibson, Lesley Head, Nicholas Gill, Gordon Waitt

Chris Gibson

No abstract provided.

Nitmiluk: Place, Politics And Empowerment In Australian Aboriginal Popular Music, Chris Gibson, Peter Dunbar-Hall

Chris Gibson

No abstract provided.

Drunken Mobilities: Backpackers, Alcohol, 'Doing Place', Mark Jayne, Chris Gibson, Gordon Waitt, Gill Valentine

Chris Gibson

This article seeks to advance the understanding of the role of alcohol, drinking and drunkenness as an important, if under-researched, element of tourism. In so doing, we work at the intersection of three bodies of writing focused on mundane mobilities; performativities of tourism and geographies of alcohol, drinking and drunkenness. Drawing on empirical research undertaken in Australia, we highlight how alcohol, drinking and drunkenness are key to backpacking holidays: first, to help soften a number of (un)comfortable embodied and emotional materialities associated with budget travel; second, as an aid to spatial and temporal imperatives of ‘passing the time’ and ‘being …

Blue-Collar Creativity: Reframing Custom-Car Culture In The Imperilled Industrial City, Andrew Warren, Chris Gibson

Chris Gibson

This paper hitches a ride with young car enthusiasts to explore how their vehicles catalyse a unique form of vernacular creativity, in a seemingly imperilled industrial city setting.While television and print media regularly demonise young drivers for street racing and `hoon' behaviour, this paper purposely adopts a different perspective, on circuits of production and qualitative aspects of the urban custom-car design scene that constitute forms of vernacular creativity. Beyond moral panics little is known about movements, networks, and linkages between custom cars, young enthusiasts, and urban spaces from which their activities emerge. Utilising responsive, in-depth ethnographic methods in Wollongong, Australia, …

Gis, Ethnography, And Cultural Research: Putting Maps Back Into Ethnographic Mapping, Christopher Brennan-Horley, Susan Luckman, Christopher Gibson, Julie Willoughby-Smith

Chris Gibson

No abstract provided.

Geographic Information Technologies For Cultural Research: Cultural Mapping And The Prospects Of Colliding Epistemologies, Christopher Gibson, Christopher Brennan-Horley, Andrew Warren

Chris Gibson

No abstract provided.

Sustainable Household Capability: Which Households Are Doing The Work Of Environmental Sustainability?, Gordon Waitt, Peter Caputi, Chris Gibson, Carol Farbotko, Lesley Head, Nick Gill, Elyse Stanes

Chris Gibson

This paper presents a framework for analysing which households are doing ‘their bit’ for sustainability in an era of climate change, using a two-stage cluster analysis of sustainable household capabilities. The framework segments households by their reported level of commitment to ‘pro-sustainability’ practices common to conventional government policies. Results are presented from a large-scale survey of Wollongong households, New South Wales, Australia. Results illustrate the importance of approaching household sustainability through everyday practices. Attention is drawn to the wide variation in participation in specific household sustainability practices. Investigation into sustainable household capability by household segments shows the limits of even …

Cultural Festivals And Economic Development In Nonmetropolitan Australia, Chris Gibson, Gordon Waitt, Jim Walmsley, John Connell

Chris Gibson

No abstract provided.

Bodily Rhythms: Corporeal Capacities To Engage With Festival Spaces, Michelle Duffy, Gordon Waitt, Andrew Gorman-Murray, Chris Gibson

Chris Gibson

No abstract provided.