cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exploring the Links Among Silence, Learning, and Innovation at Work
Creators: name: Longmore, Anne-Liisa
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Education--Adult and Continuing
subject: Adult and Continuing Education
subject: Business
subject: Workplace Learning

description: This research study explored how silence influences individual and organizational learning and innovation. I began by reflecting on my own experiences with silence as a conduit to learning. Thereafter, organizational learning and innovation was explored in the context of the rapidly changing and turbulent environment, organizational metaphors and conversation. As a phenomenon, silence was explored in workplace learning literature, culture, religion, health care, and language. Applying narrative inquiry as a methodology, I followed with conversations with 8 participants, each of whom shared their individual and personal stories of how they practiced silence in the workplace, in their learning at work and in their personal lives. Each participant story was captured on audio-tape and later transcribed (with participant approval). Field notes were taken during my conversations with participants and I maintained a personal journal of reflections and observations throughout the study. The transcribed stories, field notes and my personal reflections were reviewed several times by me and my participants resulting in the emergence of a core story suggesting that we are all interconnected individually, collectively and transpersonally and that silence is a means by which to enhance each of these connections and strengthen the interrelationships. Three significant themes emerged from the data: silence connects to self; silence connects to other; and silence connects to Spirit. An emergent model integrating and connecting my findings with complexity theory and transpersonal psychology theory was presented leading to the proposal that the organizational learning context be viewed as a complex field where the intrapersonal, interpersonal and transpersonal or spiritual fields intersect, connect, and interact simultaneously and sequentially. Silence was found to influence learning by influencing and enhancing the intersection, connection and interaction of each of the fields individually and collectively.
Regularity for the steady Stokes-type flow of incompressible Newtonian fluids in some generalized function settings
Creators: name: Tran, Minh-Phuong
name: Nguyen, Thanh-Nhan
name: Nguyen, Hong-Nhung
Publisher: name: arXiv
Year: 2023
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: A study of regularity estimate for weak solution to generalized stationary Stokes-type systems involving $p$-Laplacian is offered. The governing systems of equations are based on steady incompressible flow of a Newtonian fluids. This paper also provides a relatively complete picture of our main results in two regards: problems with nonlinearity is regular with respect to the gradient variable; and asymtotically regular problems, whose nonlinearity satisfies a particular structure near infinity. For such Stokes-type systems, we derive regularity estimates for both velocity gradient and its associated pressure in two special classes of function spaces: the generalized Lorentz and $ψ$-generalized Morrey spaces.
description: 35 pages
Static and spherically symmetric black holes in $f(R)$ theories
Creators: name: Bergliaffa, Santiago Esteban Perez
name: Nunes, Yves Eduardo Chifarelli de Oliveira
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study some features of static and spherically symmetric solutions (SSS) with a horizon in $f(R)$ theories of gravitation by means of a near-horizon analysis. A necessary condition for an $f(R)$ theory to have this type of solution is obtained. General features of the effective potential are deduced, and it is shown that there exists a limit on the curvature at the horizon, in both cases for any $f(R$). Finally, we calculate the expression for the energy of the collision of two masive particles in the center of mass frame.
Nonlinear Hall effect in Rashba systems with hexagonal warping
Creators: name: Saha, Soumadeep
name: Narayan, Awadhesh
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Rashba spin-orbit coupled systems are an important class of materials noted for diverse fundamental and applied phenomena. Recently, the emergence of non-linear Hall effect under conditions of time-reversal symmetry has been discovered in materials with broken inversion symmetry. In this work, we study the second- and third-order Hall response in Rashba systems with hexagonal warping. Starting with a low-energy model, we obtain the analytic expressions and discover the unique dipole profile in Rashba systems with hexagonal warping. Furthermore, we extend the analysis using a realistic tight-binding model. Next, we predict the existence of a third-order Hall effect in these systems, and calculate the Berry connection polarizability tensor analytically. We also show how the model parameters affect the third-order conductivity. Our predictions can help in the experimental realization of Berry curvature multipole physics in Rashba materials with hexagonal warping, and provide a new platform for engineering the non-linear Hall effects.
description: Published version
Stratigraphy, sedimentology, and geochemistry of mudstone-dominated clinoforms and their depositional environments, Carlile Formation, Eastern Alberta, Canada
Creators: name: Laycock, Dallin Palmer
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Geology
subject: Stratigraphy
subject: Sedimentology
subject: Shale
subject: Mudstone
subject: Geochemistry
subject: Alberta

description: The Carlile and Niobrara formations of the Colorado Group were deposited in a distal shelf environment in the Cretaceous Interior Seaway, during the latter part of the Greenhorn Transgressive-Regressive Cycle and the beginning of the Niobrara Transgressive-Regressive Cycle. They are dominated by mudstone, with variable amounts of interbedded siltstone and sandstone. In the Wildmere area, they form a shoreline detached clastic wedge that has clinoform geometries that resemble “systems tracts” as defined by Van Wagoner et al. (1988). These systems tracts can be recognized and correlated using cross sections of closely spaced induction LAS logs from closely spaced wells. The presence of clinoforms is indicative of bedload transport of sediment, including bedload transport of silt, sand, and hydrodynamically equivalent mudstone aggregates. Such aggregates are well documented in laboratory experiments and modern environments, but are rarely observable in the rock record due to significant compaction of the aggregates. However, the Carlile Formation contains numerous mudstone aggregates observable in thin section. These are likely derived intrabasinally from erosion by subaqueous currents or wave erosion of muddy substrates. Geochemical variations between systems tracts indicate periodic changes in sediment source, likely caused by changing circulation patterns of subaqueous currents transporting mudstone aggregates with distinct compositions from varying parts of the basin. Redox sensitive trace elements present in the clay minerals reflect variable amounts of oxygenation along the dip of the clinoforms, which relates to the amount of preserved organic material. Similar geochemical trends in modern and ancient mudstone clinoform analogues support these interpretations. As a whole, the data from the Carlile Formation and the analogues demonstrate an association between the stratigraphic geometries, sedimentological processes, geochemical trends, and their associated reservoir properties.
Exploring Protein O-GlcNAcylation as a Novel Diagnostic Tool for Type II Mellitus and the Impact of Exercise on Cardiac Protein O-GlcNAcylation
Creators: name: Myslicki, Jason
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: O-GlcNAc
subject: Type II Diabetes Mellitus
subject: Insulin Resistance
subject: Exercise
subject: post translational protein modification

description: The purpose of this study was to explore the sensitivity of O-linked β-N-acetylglucosamine (O-GlcNAc) in relation to various anthropometric and metabolic markers in healthy young adults and then to investigate how a chronic exercise regime affects this important post-translation signalling pathway in a Type II diabetic (T2DM) mouse model. Whole blood was collected from clinically healthy young adult males (n=24) and cardiac tissue was collected from diabetic (db/db) and control (db+) mice (n=9-10/group) that underwent six weeks of exercise or were designated sedentary. Western blot analysis was performed on all samples. Human whole blood exhibited greater sensitivity to Homeostatic Model of Assessment – Insulin Resistance (HOMA-IR) than Hemoglobin A1c (HbA1c) demonstrating its potential utility as a screening tool with strong diagnostic value. Six weeks of running wheel exercise did not alter protein O-GlcNAcylation in db/db or db+ mice. Protein O-GlcNAcylation is a valuable tool in assessing the efficacy of exercise in preventing T2DM.
Synchrony vs. Causality in Asynchronous Petri Nets
Creators: name: Schicke, Jens-Wolfhard
name: Peters, Kirstin
name: Goltz, Ursula
Publisher: name: arXiv
Year: 2011
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Given a synchronous system, we study the question whether the behaviour of that system can be exhibited by a (non-trivially) distributed and hence asynchronous implementation. In this paper we show, by counterexample, that synchronous systems cannot in general be implemented in an asynchronous fashion without either introducing an infinite implementation or changing the causal structure of the system behaviour.
description: In Proceedings EXPRESS 2011, arXiv:1108.4077
A Prospective Study Evaluating the Effects of Manual Therapy on the Treatment of Patellofemoral Pain
Creators: name: Tang, Conrad
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Rehabilitation and Therapy
subject: Knee pain
subject: Manual therapy
subject: Voluntary activation
subject: Rehabilitation

description: Objective: To determine whether manual therapy, specifically myofascial release technique (MRT) and Trigger Point Therapy (TPT) of the quadriceps, directly affects knee-extensor voluntary activation (VA) in patients with patellofemoral pain (PFP). Methods: This study was a randomized controlled trial (RCT). Thirty patients with PFP were recruited and randomized into group 1, who received MRT; group 2, who received TPT; and group 3, who received a sham ultrasound treatment (control group). Main outcomes: Voluntary activation, subjective knee pain scores (Visual Analogue Scale), subjective functional knee scores (Anterior Knee Pain Score - AKPS), knee-extensor torque (Biodex machine), and quadriceps electromyography (EMG) were measured over a six week experimental period. Results: Pain decreased in all three groups over the six week experimental period and there was a significant increase in % VA for the TPT group at 2 weeks post-baseline (9% increase) and 6 weeks post-baseline (10% increase). Conclusion: The TPT increased % VA, whereas MRT intervention and the control condition did not. Pain decreased in all groups to a similar degree, suggesting that a placebo effect may have produced a decrease in symptoms in this chronic PFP patient group.
Krylov Complexity of Open Quantum Systems: From Hard Spheres to Black Holes
Creators: name: Mohan, Vyshnav
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine the complexity of quasi-static chaotic open quantum systems. As a prototypical example, we analytically compute the Krylov complexity of a slowly leaking hard-sphere gas using Berry's conjecture. We then connect it to the holographic complexity of a $d+1$-dimensional evaporating black hole using the Complexity=Volume proposal. We model the black hole spacetime by stitching together a sequence of static Schwarzschild patches across incoming negative energy null shock waves. Under certain identification of parameters, we find the late time complexity growth rate during each quasi-static equilibrium to be the same in both systems.
description: 25 pages, 7 figures; v2: refs added, minor changes. Matches the published version
Gotta Catch ’Em All: CCUS with endogenous technical change
Creators: name: Bazzana, Davide
name: Comincioli, Nicola
name: Gusperti, Camilla
name: Legrenzi, Demis
name: Rizzati, Massimiliano
name: Vergalli, Sergio
Publisher: name: Unknown
Year: 2023
Subjects: subject: Environmental Economics and Policy
subject: Research and Development/Tech Change/Emerging Technologies
subject: carbon capture utilization and storage
subject: integrated sssessment model
subject: green research and development
subject: climate objectives
subject: technological uncertainties
subject: regional disparities
subject: emission reduction targets

description: Carbon Capture Utilization and Storage (CCUS) stands as a pivotal technology crucial for achieving the most ambitious climate objectives. Despite its prominent inclusion in energy mix projections, its current deployment falls short of the requisite level. Additionally, uncertainties surrounding future developments pose potential obstacles to its optimal diffusion. This study addresses two primary shortcomings that could impede the widespread adoption of CCUS. Firstly, it investigates how investments in CCUS technologies either compete with or complement other green research and development (R&D) activities. Secondly, it explores how the heterogeneity among different economies and the factors influencing the technology might lead to alternative configurations compared to the current trajectory. To address these issues, this study introduces CCUS into a regional Integrated Assessment Model (IAM) incorporating endogenous green R&D and heterogeneous cost functions. The model generates optimal pathways for both CCUS and green R&D, revealing a significant challenge: an insufficient valuation of R&D costs could potentially displace all investment in CCUS. Furthermore, the distribution of CCUS capital across regions by the end of the century necessitates substantial investments from regions with currently lower values, such as Europe and lower-income countries. This research underscores the imperative need for policies that mitigate uncertainties surrounding future technologies and coordinate contemporary state investments. Such policies are essential for CCUS to attain the envisaged contributions to emission reduction targets.
Period Analysis using the Least Absolute Shrinkage and Selection Operator (Lasso)
Creators: name: Kato, Taichi
name: Uemura, Makoto
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We introduced least absolute shrinkage and selection operator (lasso) in obtaining periodic signals in unevenly spaced time-series data. A very simple formulation with a combination of a large set of sine and cosine functions has been shown to yield a very robust estimate, and the peaks in the resultant power spectra were very sharp. We studied the response of lasso to low signal-to-noise data, asymmetric signals and very closely separated multiple signals. When the length of the observation is sufficiently long, all of them were not serious obstacles to lasso. We analyzed the 100-year visual observations of delta Cep, and obtained a very accurate period of 5.366326(16) d. The error in period estimation was several times smaller than in Phase Dispersion Minimization. We also modeled the historical data of R Sct, and obtained a reasonable fit to the data. The model, however, lost its predictive ability after the end of the interval used for modeling, which is probably a result of chaotic nature of the pulsations of this star. We also provide a sample R code for making this analysis.
description: 9 pages, 13 figures, accepted for publication in PASJ
Terahertz imaging through emissivity control
Creators: name: Mrnka, Michal
name: Penketh, Harry
name: Hooper, Ian R.
name: Saxena, Sonal
name: Grant, Nicholas E.
name: Murphy, John D.
name: Phillips, David B.
name: Hendry, Euan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Adoption of terahertz technologies is hindered by the lack of cost-effective THz sources. Here we demonstrate a fundamentally new way to generate and control THz radiation, via spatio-temporal emissivity modulation. By patterning the optical photoexcitation of a surface-passivated silicon wafer, we locally control the free-electron density, and thereby pattern the wafer's emissivity in the THz part of the electromagnetic spectrum. We show how this unconventional source of controllable THz radiation enables a new form of incoherent computational THz imaging. We use it to image various concealed objects, demonstrating this scheme has the penetrating capability of state-of-the-art THz imaging approaches, without the requirement of femto-second pulsed laser sources. Furthermore, the incoherent nature of thermal radiation also ensures the obtained images are free of interference artifacts. Our spatio-temporal emissivity control paves the way towards a new family of long-wavelength structured illumination, imaging and spectroscopy systems.
Wildlife viewing and ecotourism : ethical, scientific, and value-based considerations
Creators: name: Pitts, Anton D.
Publisher: name: University of British Columbia
Year: 2010

description: Management of wildlife viewing tourism, possibly as a legacy of management of hunting and trapping activities, tends to see its ultimate goal largely in terms of the sustainable human use of wildlife resources. However, where the potential impacts of human activities are non-lethal, the focus on population dynamics may not adequately address relevant societal and ethical concerns. Additional concerns include protecting tourist safety, maintaining a pristine wilderness experience, habituation (either positive, allowing for easier viewing, or negative, reducing animals’ “wildness'”), stressing animals, and showing disrespect or a lack of courtesy. Formal theories of animal and environmental ethics, while frequently conflicting and under-determinate in terms of specific prescriptions, provide a coherent basis and language for the discussion of each of these different concerns. The values extant in society, as reflected in lay writing about wildlife tourism, show that there is societal support for a variety of goals that wildlife tourism management should address. These include population-level and individual-level consequences as well as non-consequentialist goals such as fostering respect for wildlife or avoiding a “trophy photograph” mentality. Scientists attempting to assess the impacts of wildlife tourism use a variety of measures related to both individual and population responses. Especially when using individual-animal measures (behaviour, stress responses), scientists are rarely explicit about why these measures are important, relying instead on an implicit and uncertain link to population-level impacts. These measures, however, may be linked more directly to equally valid (from a management perspective) individual-level concerns. Given the variety of goals that are ethically justified and societally supported, it is inappropriate to conceptualise management as a mere scientific problem. Instead, I use a decision-analysis framework to synthesize relevant contributions from the scientific, ethical, and social-values literatures, identify their respective contributions to the decision-making process, and conclude that while good indicators exist for most of the objectives identified, thresholds at which changes in the indicators call for management action remain to be established.
Martina Winkler, Das Imperium und die Seeotter. Die Expansion Russlands in den nordpazifischen Raum, 1700–1867. (Transnationale Geschichte, Bd. 9.) Göttingen, Vandenhoeck & Ruprecht 2016
Creators: name: Kindler, Robert
Publisher: name: Humboldt-Universität zu Berlin
Year: 2018
Subjects: subject: 940 Geschichte Europas

description: Dieser Beitrag ist mit Zustimmung des Rechteinhabers (De Gruyter) frei zugänglich.
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titleType: Subtitle
title: Methodology of load balancing for hybrid high performance computing systems
Creators: name: Ð¡ÐµÐ»Ð¸Ð½, ÐÐ²Ð°Ð½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2020
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hpc
load balancing
optimization

description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ Ð¾Ð¿Ð¸ÑÑÐ²Ð°ÐµÑÑÑ Ð¼ÐµÑÐ¾Ð´Ð¾Ð»Ð¾Ð³Ð¸Ñ Ð±Ð°Ð»Ð°Ð½ÑÐ¸ÑÐ¾Ð²ÐºÐ¸ Ð½Ð°Ð³ÑÑÐ·ÐºÐ¸ Ð³Ð¸Ð±ÑÐ¸Ð´Ð½ÑÑ Ð²ÑÑÐ¾ÐºÐ¾Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÐµÐ»ÑÐ½ÑÑ ÑÐ¸ÑÑÐµÐ¼. ÐÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ñ ÐºÐ»Ð°ÑÑÐ¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¸ Ð¾Ð³ÑÐ°Ð½Ð¸ÑÐµÐ½Ð¸Ð¹ Ð½Ð° Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð¸Ðµ Ð·Ð°Ð´Ð°Ñ Ð½Ð° Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½ÑÑ ÑÐ·Ð»Ð°Ñ Ð¸ Ð²Ð¾Ð·Ð¼Ð¾Ð¶Ð½ÑÐµ ÐºÑÐ¸ÑÐµÑÐ¸Ð¸ ÐºÐ°ÑÐµÑÑÐ²Ð° ÑÐ°Ð±Ð¾ÑÑ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½Ð¾Ð³Ð¾ Ð¾Ð±ÐµÑÐ¿ÐµÑÐµÐ½Ð¸Ñ. Ð¡ÑÐ¾ÑÐ¼ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½ Ð¿Ð¾Ð´Ñ Ð¾Ð´ Ðº Ð¼Ð½Ð¾Ð³Ð¾ÐºÑÐ¸ÑÐµÑÐ¸Ð°Ð»ÑÐ½Ð¾Ð¹ Ð¾Ð¿ÑÐ¸Ð¼Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð¿Ð¾ ÑÐºÐ°Ð·Ð°Ð½Ð½ÑÐ¼ ÐºÑÐ¸ÑÐµÑÐ¸ÑÐ¼.
description: This paper is devoted to methodology of load balancing for hybrid high performance computing systems. A set of restrictions for executing tasks on supercomputer nodes and possible software deployment criteria are introduced. An approach to multi-criteria optimization technique for optimal deployment is formulated.
Predicted rates for direct WIMP searches
Creators: name: Vergados, J. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and low energy transfers. It is shown that for some WIMP masses the modulation amplitude may change sign. This effect can be exploited to yield information about the mass of the dark matter candidate.
description: 8 pages, 2 tables,6 figures. To appear in the proceedings of the workshop "The Dark Side of the Universe (DSU 2011)" organized by KITPC, Beijing, September 26-30, 2011
Particle Jet Formation During Explosive Dispersal
Creators: name: Frost, David L.
name: Grégoire, Yann
name: Goroshin, Sam
name: Zhang, Fan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Previous experimental studies have shown that when a layer of solid particles is explosively dispersed, the particles often develop a non-uniform spatial distribution. The instabilities within the particle bed and at the particle layer interface likely form on the timescale of the shock propagation through the particles. The mesoscale perturbations are manifested at later times in experiments by the formation of coherent clusters of particles or jet-like particle structures, which are aerodynamically stable. A number of different mechanisms likely contribute to the jet formation including shock fracturing of the particle bed and particle-particle interactions in the early stages of the dense gas-particle flow. Aerodynamic wake effects at later times contribute to maintaining the stability of the jets. The experiments shown in this fluid dynamics video were carried out in either spherical or cylindrical geometry and illustrate the formation of particle jets during the explosive dispersal process. The number of jet-like structures that are generated during the dispersal of a dry powder bed is compared with the number formed during the dispersal of the same volume of water. The liquid dispersal generates a larger number of jets, but they fragment and dissipate sooner. When the particle bed is saturated with water and explosively dispersed, the number of particle jets formed is larger than both the dry powder and pure water charges. More extensive experiments that explore the effect of particle size, density and the mass ratio of explosive to particles on the susceptibility for jet formation are reported in Frost et al. (Proc. of 23rd ICDERS, Irvine, CA, 2011).
description: 2 videos are added with the paper
Reliable communication in non-Gaussian environments : receiver design and analytical aspects
Creators: name: Mitra, Jeebak
Publisher: name: University of British Columbia
Year: 2010

description: With the plethora of devices that operate in current communication networks, there is a non-zero probability that radio frequency signals from disparate sources may interfere with each other and therefore one has to contend with unwanted signals that corrupt the desired signal. The unwanted part, collectively referred to as noise, may be attributed to a number of factors ranging from device irregularities to varied ambient phenomena. Traditionally by applying the central limit theorem, noise in communication systems has been characterized by a Gaussian distribution. However, it has been recognized time and again, that in plenty of cases this is an abstraction of the real characteristics of the noise since for a variety of reasons the central limit theorem may not hold true for the observed noise. Such noise is generally referred to as being non-Gaussian. The general belief about non-Gaussian noise is that it deteriorates signal fidelity, resulting in unreliable communication. However, the loss in reliability is due to the fact that almost all communication systems are designed to well handle Gaussian noise and hence suffers loss when this assumption is not true. We characterize the performance of coded and uncoded communication systems in non-Gaussian noise. More specifically we consider robust decoding techniques when the noise is impulsive and is correlated. We incorporate the effect of non-ideal interleaving on system performance when the noise has memory and provide several design recommendations for such environments. We also propose techniques to acquire information on the statistics of the noise when it can be modeled as a Markovian-Gaussian process and analyse the performance of such estimators. These techniques are then applied to contemporary technologies such as cognitive transmission and impulse radio ultra wideband transmission, as a proof of concept, and to quantify the benefits that exist in accurately characterizing the interference in such systems. Furthermore, we use spatial diversity in mitigating the effects of non-Gaussian noise through a distributed multi-antenna approach. Better known as cooperative diversity, this approach is shown to require careful design when the facilitating nodes are affected by strong interference and we provide novel algorithms for the same.
On the mechanism of "tulip flame" formation: the effect of ignition sources
Creators: name: Qian, Chengeng
name: Liberman, Mikhail A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The early stages of hydrogen-air flame dynamics and the physical mechanism of tulip flame formation were studied using high-resolution numerical simulations to solve the two-dimensional fully compressible Navier-Stokes equations coupled with a one-step chemical model, which was calibrated to obtain the correct the laminar flame velocity-pressure dependence. The formation of tulip flames was investigated for a flame ignited by a spark or by a planar ignition and propagating to the opposite closed or open end. For a flame ignited by a spark on-axis at the closed end of the tube and propagating to the opposite closed or open end, a tulip flame is created by a tulip-shaped axial velocity profile in the unburned gas flow near the flame front caused by the rarefaction wave(s) created by the flame during the deceleration stage(s). It is shown that, in a tube with both closed ends, this mechanism of tulip flame formation also holds for flames initiated by planar ignition. The deceleration stages in the case of planar ignition are caused by collisions of the flame front with pressure waves reflected from the opposite end of the tube. In the case of a flame initiated by planar ignition and propagating toward the open end, the mechanism of tulip flame formation is related to the stretching of the flame skirt edges backward along the side wall of the tube due to wall friction, which leads to the formation of bulges in the flame front near the tube walls. The bulges grow and finally meet at the axis of the tube, forming a tulip-shaped flame. Regardless of the method of flame initiation at the closed end, no distorted tulip flame is formed when the flame propagates to the open end of the tube.
description: 37 pages, 12 figures. arXiv admin note: text overlap with arXiv:2209.00709
Integrating Spatial Analysis and System Dynamics to Model Childhood Overweight and Obesity Prevalence
Creators: name: Shahid, Rizwan
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Geography
subject: Public Health
subject: GWR
subject: System Dynamics
subject: GIS

description: Weight is an important indicator of current and future health and it is more crucial in children who are tomorrow’s adults. This research analyzes physical activity, food environment and socioeconomic factors but recognizes that there may be other factors, not included in the analyses that are influencing overweight and obesity. Contrary to the conventional thinking of global analysis, this research suggests localized analysis and need-based interventions. The one-size-fit-all strategy may not be effective in controlling obesity rates since each neighbourhood or set of neighbourhoods has unique characteristics that need to be addressed individually. This thesis offers an innovative framework combining local analysis with simulation modeling to analyze childhood overweight and obesity for children 4.5 to 6 years old. Spatial models generally do not deal with simulation over time, making it cumbersome for health planners and policy makers to effectively design and implement interventions and to quantify their impact over time. This research fills this gap by combining geographically weighted regression (GWR) to identify vulnerable neighbourhoods and critical factors for childhood overweight and obesity, and simulation modeling to evaluate the impact of suggested interventions on the targeted neighbourhoods. Walkability was chosen as a potential intervention to test the framework. Simulation results suggest that some walkability interventions would achieve measurable declines in childhood obesity rates. The result appears encouraging, and the improvement will likely compound over time. Moreover, the significant association between obesity and walkability decreases over time, exposing other factors that can be targeted at a later stage. The research further addresses an outstanding issue in the emerging GWR method, local multicollinearity, by proposing a novel solution. Another contribution in the GWR and cartography literature is the introduction of an innovative way of mapping t-values and R2. Overall, the results demonstrate that the integration of GWR and simulation modeling is cost effective, flexible and general in nature that can be applied to different areas and to address other health issues. The innovative framework has great potential for health professionals and policy makers to design obesity control and prevention programs that meet the unique characteristics of each neighbourhood.
Inter-species spin-noise correlations in hot atomic vapors
Creators: name: Mouloudakis, K.
name: Vouzinas, F.
name: Margaritakis, A.
name: Koutsimpela, A.
name: Mouloudakis, G.
name: Koutrouli, V.
name: Skotiniotis, M.
name: Tsironis, G. P.
name: Loulakis, M.
name: Mitchell, M. W.
name: Vasilakis, G.
name: Kominis, I. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report an experimental and theoretical study of spin noise correlations in a $^{87}$Rb-$^{133}$Cs unpolarized alkali-metal vapor dominated by spin-exchange collisions. We observe strong unequal-time inter-species correlations and account for these with a first-principles theoretical model. Since the two atomic species have different spin precession frequencies, the dual-species vapor enables the use of an additional experimental handle, the applied magnetic field, for untangling various sub-types of spin correlations. In particular, the measured cross-correlation and auto-correlation spectra shed light on a number of spin-dynamic effects involving intra-atom, inter-atom, intra-species and inter-species correlations. Cross-correlation coefficients exceeding $60\%$ have been observed at low-magnetic fields, where the two spin species couple strongly via spin-exchange collisions. The understanding of such spontaneously generated correlations can motivate the design of quantum-enhanced measurements with single or multi-species spin-polarized alkali-metal vapors used in quantum sensing applications.
Total angular momentum representation for atom-molecule collisions in electric fields
Creators: name: Tscherbul, T. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: It is shown that the atom-molecule collision problem in the presence of an external electric field can be solved using the total angular momentum representation in the body-fixed coordinated frame, leading to a computationally efficient method for ab initio modeling of low-temperature scattering phenomena. Our calculations demonstrate rapid convergence of the cross sections for vibrational and Stark relaxation in He-CaD collisions with the number of total angular momentum states in the basis set, leading to a 5-100 fold increase in computational efficiency over the previously used methods based on the fully uncoupled space-fixed representation. These results open up the possibility of carrying out numerically converged quantum scattering calculations on a wide array of atom-molecule collisions and chemical reactions in the presence of electric fields.
description: 19 pages, 3 figures, 1 table
Robust non-Markovianity in ultracold gases
Creators: name: Haikka, Pinja
name: McEndoo, Suzanne
name: De Chiara, Gabriele
name: Palma, Massimo
name: Maniscalco, Sabrina
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the effect of thermal fluctuations on a probe qubit interacting with a Bose-Einstein condensed (BEC) reservoir. The zero-temperature case was studied in [Haikka P et al 2011 Phys. Rev. A 84 031602], where we proposed a method to probe the effects of dimensionality and scattering length of a BEC based on its behavior as an environment. Here we show that the sensitivity of the probe qubit is remarkably robust against thermal noise. We give an intuitive explanation for the thermal resilience, showing that it is due to the unique choice of the probe qubit architecture of our model.
description: Submitted to FQMT11 topical issue of the Physica Scripta
Probing Majorana localization in minimal Kitaev chains through a quantum dot
Creators: name: Souto, Rubén Seoane
name: Tsintzis, Athanasios
name: Leijnse, Martin
name: Danon, Jeroen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Artificial Kitaev chains, formed by quantum dots coupled via superconductors, have emerged as a promising platform for realizing Majorana bound states. Even a minimal Kitaev chain (a quantum dot--superconductor--quantum dot setup) can host Majorana states at discrete sweet spots. However, unambiguously identifying Majorana sweet spots in such a system is still challenging. In this work, we propose an additional dot coupled to one side of the chain as a tool to identify good sweet spots in minimal Kitaev chains. When the two Majorana states in the chain overlap, the extra dot couples to both and thus splits an even--odd ground-state degeneracy when its level is on resonance. In contrast, a ground-state degeneracy will persist for well-separated Majorana states. This difference can be used to identify points in parameter space with spatially separated Majorana states, using tunneling spectroscopy measurements. We perform a systematic analysis of different relevant situations. We show that the additional dot can help distinguishing between Majorana sweet spots and other trivial zero-energy crossings. We also characterize the different conductance patterns, which can serve as a guide for future experiments aiming to study Majorana states in minimal Kitaev chains.
description: 10 pages, 7 figures
Performance Evaluation of Ant-Based Routing Protocols for Wireless Sensor Networks
Creators: name: Zungeru, Adamu Murtala
name: Ang, Li-Minn
name: Seng, Kah Phooi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: High efficient routing is an important issue in the design of limited energy resource Wireless Sensor Networks (WSNs). Due to the characteristic of the environment at which the sensor node is to operate, coupled with severe resources; on-board energy, transmission power, processing capability, and storage limitations, prompt for careful resource management and new routing protocol so as to counteract the differences and challenges. To this end, we present an Improved Energy-Efficient Ant-Based Routing (IEEABR) Algorithm in wireless sensor networks. Compared to the state-of-the-art Ant-Based routing protocols; Basic Ant-Based Routing (BABR) Algorithm, Sensor-driven and Cost-aware ant routing (SC), Flooded Forward ant routing (FF), Flooded Piggybacked ant routing (FP), and Energy-Efficient Ant-Based Routing (EEABR), the proposed IEEABR approach has advantages in terms of reduced energy usage which can effectively balance the WSN node's power consumption, and high energy efficiency. The performance evaluations for the algorithms on a real application are conducted in a well known WSN MATLAB-based simulator (RMASE) using both static and dynamic scenario.
description: 10 pages, 5 figures, Journal Publication
Non-pharmacological treatment of insomnia in cancer patients: a randomized, controlled, non-inferiority trial investigating mindfulness-based and cognitive-behavioral approaches.
Creators: name: Garland, Sheila Nadine
Publisher: name: Graduate Studies
Year: 2012
Subjects: subject: Psychology--Clinical
subject: cancer
subject: Insomnia
subject: Mindfulness-Based Stress Reduction
subject: Cognitive Behavior Therapy
subject: RCT
subject: Non-inferiority

description: Patients who are diagnosed and treated for cancer are three times more likely than the general population to experience disturbed sleep and insomnia. The presence of persistent insomnia places patients at a higher risk for psychological and physical morbidity and reduced quality of life. This dissertation examined the use of non-pharmacological interventions to address insomnia in a heterogeneous sample of cancer patients. Cognitive-Behavioral Therapy for insomnia (CBT-I) is considered a well-established intervention, however a substantial proportion of people do not experience a treatment response or complete insomnia remittance. Mindfulness-Based Stress Reduction (MBSR) is generating a considerable amount of research interest in the area of insomnia due to its demonstrated effectiveness in reducing cognitive and physiological arousal, factors associated with disturbed sleep. We employed a non-inferiority design to determine whether MBSR performs to the same standard as CBT-I for insomnia, while providing additional benefits such as improved mood and lower appraisals of stress. MBSR was non-inferior to CBT-I for improving sleep when assessed three months after treatment completion, but not immediately post-program. This result is attributed to MBSR producing slower but continual improvements over time while CBT-I generated rapid effects that were largely maintained. While both groups demonstrated the ability to reduce stress symptoms and mood disturbance, those receiving CBT-I uniquely improved sleep quality and dysfunctional sleep beliefs. Secondary analyses were performed on the full sample (N=111) to examine associations between dispositional mindfulness, sleep and psychological outcomes. Mindfulness facets of acting with awareness, non-judging and non-reacting were associated with better sleep and psychological outcomes, but mindfulness was not predictive of fewer sleep disturbances above and beyond the influence of symptoms of stress and mood disturbance. We then focused specifically on the MBSR group (n=32) to examine whether improvements in mindfulness were associated with sleep and psychological outcomes. This sub-study suggests that one of the mechanisms by which MBSR may improve sleep outcomes is through a reduction in dysfunctional sleep-related beliefs. This body of work emphasizes the need to conduct patient-centered research and expands potential treatment options for patients with insomnia.
Damaged? Not Me: Women's Lived Experience of Growth Following Multiple Traumas
Creators: name: Renny, Katerina
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Psychology--Social
subject: posttraumatic growth
subject: multiple traumas
subject: Women
subject: Interpretive Phenomenological Analysis

description: Posttraumatic growth has been found to develop following a wide variety of adverse life events. This study utilizes Interpretive Phenomenological Analysis to lend an understanding to women’s lived experiences of growth following multiple trauma experiences, as little is known about the positive growth outcomes following multiple hardships. Nine women who have experienced complex multiple traumas were interviewed about their posttraumatic growth. The findings revealed five main growth facilitating processes as being important catalysts to the development of growth within these women’s lives, as well as identified five main areas of growth. Growth facilitating processes included: (1) belief in growth potential, (2) growth as a conscious purposeful process, (3) aligning with hope and spirituality, (4) positive role models and supportive others, and (5) knowledge and skill development. The experiences of growth consisted of: (1) a compassionate self, (2) a better self, (3) an empowered self, (4) moving forward in preferred directions, and (5) aligning with gratitude. This study shows that women’s lived experiences of growth following multiple traumas are similar to the findings of previous posttraumatic growth research with single type traumas. The findings challenge the stigma of being forever damaged after multiple trauma experiences.
Application of Ionic Liquids for Gas Sweetening
Creators: name: Mortazavi Manesh, Soheil
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Engineering--Chemical
subject: Ionic Liquid
subject: Gas Sweetening

description: In this study, general models were developed to predict the solubility of CO2, H2S, CH4 and C2H6 in ionic liquids (ILs) where no experimental data are available. These models use fugacity functions based on asymmetric activity coefficients calculated using the fundamental COSMO-RS method, the Peng-Robinson equation of state (PR-EOS), and an empirical Henry’s constant of the solute in the IL. The Henry’s constant has been correlated with the temperature and pressure of the system and physical properties of the ILs. It was found that, for CO2 and CH4, the molecular weight (MW) of the ILs and for H2S and C2H6, the surface area of the ILs are the best choice to correlate solubilities. 425 ILs were ranked based on their absorption capacity and selectivity of H2S and CO2 versus CH4 and C2H6 absorption using the newly developed procedure. The top eight ILs were selected and characterized for use in a commercial simulator. EOS’s binary interaction parameters between solutes and IL were determined using the proposed model. The performance of the ILs as solvents in gas sweetening plants is compared to Morphysorb (a physical solvent) and MDEA (a selective chemical solvent) at similar gas feed and product specifications. Among the candidate ILs, pmim-L appears to be the best option for gas sweetening. ILs show better performance over MDEA and Morphysorb when operating at high H2S compositions, that is for bulk removal of acid gases. In a case study, the H2S concentration was reduced from 13% to 5% and the total heating and pumping duty required for the pmim-L gas plant was 23 times less than the MDEA and 9 times less than the Morphysorb. Also, pmim-L required 89 times less cooling than MDEA and 13 times less than a Morphysorb for the simulated gas plant. Furthermore, IL gas plants require negligible makeup solvent whereas MDEA plant requires 4.8 kg/hr pure MDEA and 13 m3/hr makeup water. A Morphysorb plant required 84 kg/hr makeup solvent. It was also shown that ILs are hydroscopic and can reduce the water content of natural gas. With a few percent additional energy, the pmim-L gas plant can be converted to a gas sweetening-dehydration plant which is able to meet the water content specifications for natural gas pipelines. Alkanolamine plants require an additional dehydration unit to produce sales gas. Based on the partial pressure of H2S in the feed and product, guidelines have been provided to choose between MDEA and pmim-L gas plants.
Higgs Phenomenology of Minimal Universal Extra Dimensions
Creators: name: Bélanger, G.
name: Belyaev, A.
name: Brown, M.
name: Kakizaki, M.
name: Pukhov, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The minimal model of Universal Extra Dimensions (MUED) is briefly reviewed. We explain how the cross-sections for Higgs production via gluon fusion and decay into two photons are modified, relative the the Standard Model (SM) values, by KK particles running in loops, leading to an enhancement of the gg to h to two photons and gg to h to W+W- cross-sections. ATLAS and CMS searches for the SM Higgs in these channels are reinterpreted in the context of MUED and used to place new limits on the MUED parameter space. Only a small region of between 1 and 3 GeV around mh = 125 GeV for 500 GeV < 1/R < 1600 GeV remains open at the 95 % confidence level.
description: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 4 figures