cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Sensor Management for Tracking in Sensor Networks
Creators: name: Fuemmeler, Jason A.
name: Atia, George K.
name: Veeravalli, Venugopal V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: We study the problem of tracking an object moving through a network of wireless sensors. In order to conserve energy, the sensors may be put into a sleep mode with a timer that determines their sleep duration. It is assumed that an asleep sensor cannot be communicated with or woken up, and hence the sleep duration needs to be determined at the time the sensor goes to sleep based on all the information available to the sensor. Having sleeping sensors in the network could result in degraded tracking performance, therefore, there is a tradeoff between energy usage and tracking performance. We design sleeping policies that attempt to optimize this tradeoff and characterize their performance. As an extension to our previous work in this area [1], we consider generalized models for object movement, object sensing, and tracking cost. For discrete state spaces and continuous Gaussian observations, we derive a lower bound on the optimal energy-tracking tradeoff. It is shown that in the low tracking error regime, the generated policies approach the derived lower bound.
Thermal decomposition of struvite : a novel approach to recover ammonia from wastewater using struvite decomposition products
Creators: name: Farhana, Sharmeen
Publisher: name: University of British Columbia
Year: 2016

description: Ammonia recovery technology, utilizing newberyite (MgHPO₄.3H₂O) as a struvite (MgNH₄PO₄.6H₂O) decomposition product, is gaining interest as usage of newberyite can significantly reduce the cost of commercial reagents, by providing readily available magnesium and phosphate for struvite reformation. In this study, the efficiency of ammonia removal from struvite, and a transformation process of struvite to newberyite, were investigated through performing oven dry, bench-scale and pilot-scale experiments. In the oven dry experiments, the structural and compositional changes of synthetic struvite, upon decomposition, were evaluated. Around 60-70% ammonia removal efficiency was achieved through struvite thermal decomposition above 60º±0.5ºC, with up to 71.1ºC with prolonged heating. The 2D amorphous layered structure, present in the decomposed solid phase, entrapped around 30-40% residual ammonia between the layers of magnesium and phosphate, inhibiting further ammonia removal. Subsequently, bench-scale experiments were conducted based on the hypothesis that humid air can prevent the formation of a layered structure including dittmarite (MgNH₄PO₄.H₂O) and an amorphous 2D layered structure. Struvite pellets of different sources and sizes were heated in a fluidized bed reactor in the presence of hot air and steam. Introduction of steam resulted in complete transformation of struvite pellets (<1mm) into newberyite at 80ºC, 95% relative humidity and 2 hours of heating. Finally, pilot-scale experiments were carried out to further optimize the operating conditions for industrial application. The smaller and softer pellets (size <1mm, hardness 300-500 g) were the best suited for struvite-to-newberyite conversion. The process was optimized further by narrowing down the relative humidity from 95% to 85% and reducing the heating duration from 2 to 1.5 hours. The operating cost of the pilot-scale process was estimated, which can be reduced through recycling the heat and moist air over the cycle. The number of cycles for which the decomposed product can be effectively reused depends on the required overall N-recovery efficiency, as well as the performance of the struvite recrystallization stage. The greatest advantage of the proposed technology, over other recovery methods, is that the operating costs can be turned into revenue by utilizing the recovered product as fertilizer or energy source.
Controlling Excitations Inversion of a Cooper Pair Box Interacting with a Nanomechanical Resonator
Creators: name: Valverde, C.
name: Avelar, A. T.
name: Baseia, B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 03.65 -w, 03.65 Yz, 85.85. +j

description: We investigate the action of time dependent detunings upon the excitation inversion of a Cooper pair box interacting with a nanomechanical resonator. The method employs the Jaynes-Cummings model with damping, assuming different decay rates of the Cooper pair box and various fixed and t-dependent detunings. It is shown that while the presence of damping plus constant detunings destroy the collapse/revival effects, convenient choices of time dependent detunings allow one to reconstruct such events in a perfect way. It is also shown that the mean excitation of the nanomechanical resonator is more robust against damping of the Cooper pair box for convenient values of t-dependent detunings.
description: 11 pages, 5 figures
Detecting Star Formation in Brightest Cluster Galaxies with GALEX
Creators: name: Hicks, Amalia
name: Mushotzky, Richard F.
name: Donahue, Megan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the results of GALEX observations of 17 cool core (CC) clusters of galaxies. We show that GALEX is easily capable of detecting star formation in brightest cluster galaxies (BCGs) out to $z\ge 0.45$ and 50-100 kpc. In most of the CC clusters studied, we find significant UV luminosity excesses and colors that strongly suggest recent and/or current star formation. The BCGs are found to have blue UV colors in the center that become increasingly redder with radius, indicating that the UV signature of star formation is most easily detected in the central regions. Our findings show good agreement between UV star formation rates and estimates based on H$α$ observations. IR observations coupled with our data indicate moderate-to-high dust attenuation. Comparisons between our UV results and the X-ray properties of our sample suggest clear correlations between UV excess, cluster entropy, and central cooling time, confirming that the star formation is directly and incontrovertibly related to the cooling gas.
description: 39 pages, 11 figures; accepted for publication in The Astrophysical Journal. Figure quality reduced to comply with arXiv file size requirements
Conditional extremes in asymmetric financial markets
Creators: name: Zhang, Jinyuan
Publisher: name: University of British Columbia
Year: 2015

description: The project focuses on the estimation of the probability distribution of a bivariate random vector given that one of the components takes on a large value. These conditional probabilities can be used to quantify the effect of financial contagion when the random vector represents losses on financial assets and as a stress-testing tool in financial risk management. However, it is tricky to quantify these conditional probabilities when the main interest lies in the tails of the underlying distribution. Specifically, empirical probabilities fail to provide adequate estimates while fully parametric methods are subject to large model uncertainty as there is too little data to assess the model fit in the tails. We propose a semi-parametric framework using asymptotic results in the spirit of extreme values theory. The main contributions include an extension of the limit theorem in Abdous et al. [Canad. J. Statist. 33 (2005)] to allow for asymmetry, frequently encountered in financial and insurance applications, and a new approach for inference. The results are illustrated using simulations and two applications in finance.
Spectral form factor in the $τ$-scaling limit
Creators: name: Okuyama, Kazumi
name: Sakai, Kazuhiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the spectral form factor (SFF) of general topological gravity in the limit of large time and fixed temperature. It has been observed recently that in this limit, called the tau-scaling limit, the genus expansion of the SFF can be summed up and the late-time behavior of the SFF such as the ramp-plateau transition can be studied analytically. In this paper we develop a technique for the systematic computation of the higher order corrections to the SFF in the strict tau-scaling limit. We obtain the first five corrections in a closed form for the general background of topological gravity. As concrete examples, we present the results for the Airy case and Jackiw-Teitelboim gravity. We find that the above higher order corrections are the Fourier transforms of the corrections to the sine-kernel approximation of the Christoffel-Darboux kernel in the dual double-scaled matrix integral, which naturally explains their structure. Along the way we also develop a technique for the systematic computation of the corrections to the sine-kernel formula, which have not been fully explored in the literature before.
description: 29 pages, v2: typos corrected, published version
Essays on urban structure and dynamics
Creators: name: Cosman, Jacob Neal
Publisher: name: University of British Columbia
Year: 2015

description: This thesis consists of three essays on urban structure and dynamics. These essays use empirical tools from empirical industrial organization and applied microeconomics to examine how cities grow and change. Access to high-quality local services constitutes an important amenity in residents' valuation of cities. In "Industry dynamics and the value of variety in nightlife: evidence from Chicago", I examine consumer preferences for variety in nightlife to understand these preferences and their impact on nightlife industry dynamics. I develop a structural dynamic model for venue entry and exit in the nightlife industry and estimate the model using a panel of liquor license data from Chicago. I find strong preferences for variety. My results suggest that in equilibrium a new entrant can increase profits for incumbent venues in some cases due to increased demand. However, potential entrants face high barriers to entry. In "Land value gradients and the level and growth of housing prices", coauthor Tom Davidoff and I ask whether urban land rent gradients affect the level and growth of housing rents and prices. We use residential rents and the location of Starbucks stores to proxy for land prices, and calculate a gradient measure that allows for multiple peaks of land rent within a metropolitan area. Our measures of land rent gradients are significantly associated with high and rising prices, and explain some of the cross-sectional variation in prices. However, our measure does not explain the abnormally high rent and prices in Pacific and Northeastern coastal "Superstar Cities." Bartik shocks are widely used as an instrument for local labour demand. A potential concern with this instrument is potential endogeneity in the presence of correlation between city-level industrial composition and the outcome variable of interest. In "A control function approach to the correlated components of Bartik shocks", I formalize this endogeneity concern and introduce a control function correction that, given additional assumptions, addresses the potential endogeneity. I demonstrate the application of this novel approach by estimating a housing supply function.
ac-locking of thermally-induced sine-Gordon breathers
Creators: name: De Santis, Duilio
name: Guarcello, Claudio
name: Spagnolo, Bernardo
name: Carollo, Angelo
name: Valenti, Davide
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: A complete framework for exciting and detecting thermally-induced, stabilized sine-Gordon breathers in ac-driven long Josephson junctions is developed. The formation of long-time stable breathers locked to the ac source occurs for a sufficiently high temperature. The latter emerges as a powerful control parameter, allowing for the remarkably stable localized modes to appear. Nonmonotonic behaviors of both the breather generation probability and the energy spatial correlations versus the thermal noise strength are found. The junction's resistive switching characteristics provides a clear experimental signature of the breather.
description: 5 pages, 4 figures; Supp Mat: 4 pages, 2 figures
Magnetohydrodynamic models of astrophysical jets
Creators: name: Beskin, V. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In this review, analytical results obtained for a wide class of stationary axisymmetric flows in the vicinity of compact astrophysical objects are analyzed, with an emphasis on quantitative predictions for specific sources. Recent years have witnessed a great increase in understanding the formation and properties of astrophysical jets. This is due not only to new observations but also to advances in analytical theory which has produced fairly simple relations, and to what can undoubtedly be called a breakthrough in numerical simulation which has enabled confirmation of theoretical predictions. Of course, we are still very far from fully understanding the physical processes occurring in compact sources. Nevertheless, the progress made raises hopes for near-future test observations that can give insight into the physical processes occurring in active astrophysical objects.
description: 40 pages, translated by K.A.Postnov, edited by A.Radzig
Boletín: Trayectoria del semillero de investigación TROPUS
Creators: name: Burbano García, Claudia Lorena
name: Giron Ojeda, Angela Patricia
name: Estudiantes Fup
Publisher: name: Zenodo
Year: 2021

description: Dar a conocer las trayectorias investigativas de los grupos de la línea salud -clínica en el 2021
Diffusion and conduction in a salt-free colloidal suspension via molecular dynamics simulations
Creators: name: Bastea, Sorin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Molecular dynamics (MD) simulations are used to determine the diffusion coefficients, electrophoretic mobilities and electrical conductivity of a charged colloidal suspension in the salt-free regime as a function of the colloid charge. The behavior of the colloidal particles' diffusion constant can be well understood in terms of two coupled effects: counterion 'condensation' and slowdown due to the relaxation effect. We find that the conductivity exhibits a maximum which approximately separates the regimes of counterion-dominated and colloid-dominated conduction. We analyze the electrophoretic mobilities and the conductivity in terms of commonly employed assumptions about the role of "free" and "condensed" counterions, and discuss different interpretations of this approach.
description: 10 pages, 4 figures
Revealing the nature of hidden charm pentaquarks with machine learning
Creators: name: Zhang, Zhenyu
name: Liu, Jiahao
name: Hu, Jifeng
name: Wang, Qian
name: Meißner, Ulf-G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the nature of the hidden charm pentaquarks, i.e. the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$, with a neural network approach in pionless effective field theory. In this framework, the normal $χ^2$ fitting approach cannot distinguish the quantum numbers of the $P_c(4440)$ and $P_c(4457)$. In contrast to that, the neural network-based approach can discriminate them. In addition, we also illustrate the role of each experimental data bin of the invariant $J/ψp$ mass distribution on the underlying physics in both neural network and fitting methods. Their similarities and differences demonstrate that neural network methods can use data information more effectively and directly. This study provides more insights about how the neural network-based approach predicts the nature of exotic states from the mass spectrum.
description: accepted by Science Bulletin
Structural and functional characterization of components of bacterial type III secretion systems
Creators: name: Burkinshaw, Brianne J.
Publisher: name: University of British Columbia
Year: 2015

description: Many Gram-negative pathogens use a type III secretion system (T3SS) to inject effector proteins into the host cytoplasm, where they manipulate host processes to the advantage of the bacterium. The T3SS is composed of a cytoplasmic export apparatus, a membrane-spanning basal body with a central channel formed by the inner rod, an extra-cellular needle filament and a translocon complex that inserts in the host membrane. In this thesis, proteins involved in T3SS assembly, as well as a T3SS effector protein were structurally and functionally characterized. The structure of EtgA, a T3SS-associated peptidoglycan (PG)-cleaving enzyme from enteropathogenic Escherichia coli (EPEC) was solved. The EtgA active site has features in common with lytic transglycosylases (LTs) and hen egg-white lysozyme (HEWL). EtgA contains an aspartate that aligns with lysozyme Asp52 (a residue critical for catalysis), a conservation not observed in LT families to which the conserved T3SS enzymes were presumed to belong. Mutation of the EtgA catalytic glutamate conserved across LTs and HEWL, and this differentiating aspartate diminishes type III secretion in vivo, supporting its essential role in T3SS assembly. EtgA forms a complex with the T3SS inner rod component, which enhances PG-lytic activity of EtgA in vitro, providing localization and regulation of the lytic activity to prevent cell lysis. After assembly of the basal body and needle, the gatekeeper protein ensures the translocon assembles at the needle tip prior to secretion of effector proteins. The gatekeeper from EPEC (SepL) was crystallized and it was shown that it has three X-bundle domains, which likely mediate protein-protein interactions to control translocon and effector secretion. Comparison of SepL to structurally characterized orthologs revealed several conserved residues, which may be required to regulate secretion of translocators or effectors. Finally, SopB, a Salmonella effector protein, in complex with host Cdc42, an Rho GTPase that regulates critical events in eukaryotic cytoskeleton organization and membrane trafficking was structurally characterized. Structural and biochemical analysis of the SopB/ Cdc42 complex shows that SopB structurally and functionally mimics a host guanine nucleotide dissociation inhibitor (GDI) by contacting key residues in the regulatory switch regions of Cdc42 and slowing Cdc42 nucleotide exchange.
Dielectric properties of polymers with lateral resolution using an AFM approach: nanoDielectric Spectroscopy
Creators: name: Daniel, E.
Publisher: name: Zenodo
Year: 2019
Subjects: AFM
Polymers
Nanostructures

description: Presentation given at the "Polymat seminar series 2018/2019"

Abstract:

The study of the physical properties at the nanometer scale is becoming a key aspect for understanding the relations between the molecular organization and physical behavior in nanostructured polymer materials. Atomic Force Microscopy (AFM) based techniques can provide useful information on the surface morphology as well as quantitative information of physical properties, with lateral resolution usually below 50 nm. This aims to achieve a one-to-one relationship between the physical origins of different processes to their particular structures at the molecular scale. For example, using the AFM probe as a nanoelectrode, it is possible to study the topographical and electrical properties of polymers, simultaneously. This is the idea behind nanoDielectric Spectroscopy (nDS), a technique that allows the electrical mapping of surfaces to obtain information related to the components of the complex dielectric permittivity (*), at a fixed electric field frequency (f). In addition, it is possible to carry out broadband dielectric spectroscopy measurements (f = 1 Hz – 100 kHz) at fixed points on the sample’s surface. [1,2] These measurements can be analyzed under the framework of classical electrodynamics and allow the study of polymers molecular dynamics and transport properties. As a case of study, I’ll present nDS experiments on poly(ethylene oxide) (PEO) thin films. PEO is a semicrystalline polymer that at room temperature shows a dielectric signal related to charge trapping between amorphous/crystalline interfaces. This phenomenon is directly related to the ionic conductivity of the material. Using nDS I’ll present dielectric images of PEO at room temperature, with 40 nm lateral resolution, and in a humidity range of 15 – 60%. The nDS results were analyzed taking into consideration the role of the tip/sample geometry and allowed to obtain the complex dielectric permittivity function. These results will be discussed by taking into consideration the presence of water on the PEO surface and on the AFM probe, as well as taking into account the different molecular organizations of PEO.
DEP Bulletin:Volume 39 Issue 24
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 2015

description: The DEP bulletin is a semi-monthly publication of the New Jersey Department of Environmental Protection. It contains a list of construction permit applications recently filed or acted upon by the Department along with a calendar of events of interest, a schedule of public hearings, and Environmental Impact Statements acted upon during the period.
New Results from the Magellan IMACS Spectroscopic Lyman Alpha Survey: NICMOS Observations of Lyman Alpha emitters at z=5.7
Creators: name: Henry, Alaina L.
name: Martin, Crystal L.
name: Dressler, Alan
name: McCarthy, Patrick
name: Sawicki, Marcin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present NICMOS J110 (rest-frame 1200-2100 A) observations of the three z=5.7 Lyman Alpha emitters discovered in the blind multislit spectroscopic survey by Martin et al. (2008). These images confirm the presence of the two sources which were previously only seen in spectroscopic observations. The third source, which is undetected in our J110 observations has been detected in narrowband imaging of the Cosmic Origins Survey (COSMOS), so our nondetection implies a rest frame equivalent width >146 Angstroms (3 sigma). The two J110-- detected sources have more modest rest frame equivalent widths of 30-40 Angstroms, but all three are typical of high-redshift LAEs. In addition, the J110- detected sources have UV luminosities that are within a factor of two of L*_{UV}, and sizes that appear compact (r_{hl} ~ 0."15) in our NIC2 images -- consistent with a redshift of 5.7. We use these UV-continuum and Lyman Alpha measurements to estimate the i-z colors of these galaxies, and show that at least one, and possibly all three would be missed by the i-dropout LBG selection. These observations help demonstrate the utility of multislit narrowband spectroscopy as a technique for finding faint emission line galaxies.
description: Accepted to ApJ
Light Scattering on Nanowire Antennas: A Semi-Analytical Approach
Creators: name: Kremers, Christian
name: Chigrin, Dmitry N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Two semi-analytical approaches to solve the problem of light scattering on nanowire antennas are developed and compared. The derivation is based on the exact solution of the plane wave scattering problem in case of an infinite cylinder. The original three-dimensional problem is reduced in two alternative ways to a simple one-dimensional integral equation, which can be solved numerically by a method of moments approach. Scattering cross sections of gold nanowire antennas with different lengths and aspect ratios are analysed for the optical and near-infrared spectral range. Comparison of the proposed semi-analytical methods with the numerically rigorous discrete dipole approximation method demonstrates good agreement as well as superior numerical performance.
description: 9 pages, 5 figures
Spreading Widths of Doorway States
Creators: name: De Pace, A.
name: Molinari, A.
name: Weidenmueller, H. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: As a function of energy E, the average strength function S(E) of a doorway state is commonly assumed to be Lorentzian in shape and characterized by two parameters, the peak energy E_0 and the spreading width Gamma. The simple picture is modified when the density of background states that couple to the doorway state changes significantly in an energy interval of size Gamma. For that case we derive an approximate analytical expression for S(E). We test our result successfully against numerical simulations. Our result may have important implications for shell--model calculations.
description: 13 pages, 7 figures
Facing Medusa : (intimate) art and resistance in the Colombian armed conflict
Creators: name: Paola, Adarve-Zuluaga
Publisher: name: University of British Columbia
Year: 2015

description: The Colombian armed conflict is one of the oldest conflicts in the world. Numbers hardly explain the damage it has caused. Artistic responses to war emerge in this context, sometimes with the purpose of exerting some form of resistance to violence. I examine the ways in which similar responses operate and can produce social change, by tracing the work of three Colombian visual creators: Erika Diettes, Jesús Abad Colorado, and Juan Manuel Echavarría. This study reveals how their practice (re) configures certain spaces as intimate public scenarios of collective spectatorship/witnessing. The investigation also speaks of the inmost relation between the victims and survivors that they work with, spectators, and the creators themselves. That relation evidences the creators’ role as companions of the people they work with in conflicted contexts. Resistance becomes a central concept with which to understand both spectatorship/witnessing acts and the companionship relation mentioned above. Ultimately, their visual practice allows publics to resist emotional paralysis when looking at the horrors of war; that is to resist “turning into stone” when looking at Medusa.
Scaling relations for magnetic nanoparticles
Creators: name: Landeros, P.
name: Escrig, J.
name: Altbir, D.
name: Laroze, D.
name: Castro, J. d'Albuquerque e
name: Vargas, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A detailed investigation of the scaling relations recently proposed by [J. d'Albuquerque e Castro, D. Altbir, J. C. Retamal, and P. Vargas, Phys. Rev. Lett. 88, 237202 (2002)] to study the magnetic properties of nanoparticles is presented. Analytical expressions for the total energy of three characteristic internal configurations of the particles are obtained, in terms of which the behavior of the magnetic phase diagram for those particles upon scaling of the exchange interaction is discussed. The exponent $η$ in scaling relations is shown to be dependent on the geometry of the vortex core, and results for specific cases are presented.
description: 6 pages, 4 figures
Toward mean-field bound for critical temperature on Nishimori line
Creators: name: Okuyama, Manaka
name: Ohzeki, Masayuki
Publisher: name: arXiv
Year: 2024
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The critical inverse temperature of the mean-field approximation establishes a lower bound of the true critical inverse temperature in a broad class of ferromagnetic spin models. This is referred to as the mean-field bound for the critical temperature. In this study, we explored the possibility of a corresponding mean-field bound for the critical temperature in Ising spin glass models with Gaussian randomness on the Nishimori line. On this line, the critical inverse temperature of the mean-field approximation is given by $β_{MF}^{NL}=\sqrt{1/z}$, where $z$ is the coordination number. Using the Griffiths inequalities on the Nishimori line, we proved that there is zero spontaneous magnetization in the high-temperature region $β< β_{MF}^{NL}/2$. In other words, the true critical inverse temperature $β_c^{NL}$ on the Nishimori line is always bounded by $β_c^{NL} \ge β_{MF}^{NL}/2$. Unfortunately, we have not succeeded in obtaining the corresponding mean-field bound $β_c^{NL} \ge β_{MF}^{NL}$ on the Nishimori line.
description: 10pages, 0 figure
Shattering glass boxes : museums and Dene resurgence against the colonial politics of recognition
Creators: name: Wrightson, Kelsey Radcliffe
Publisher: name: University of British Columbia
Year: 2015

description: In aiming to dispossess Indigenous peoples from their land and destroy their cultures, settler colonialism increasingly operates by “recognizing” and appropriating Indigenous identities into dominant national narratives. However, Indigenous peoples globally have found numerous ways to unsettle colonial powers, including claiming and reclaiming cultural practices in formerly colonial institutions such as museums. This dissertation examines the role of museums in perpetuating and opposing settler colonialism in Canada. First, I critique museums as forwarding settler colonial narrative and material violence against Indigenous peoples. Second, I examine the ways that Indigenous peoples have been engaging in museum spaces in order to “turn away” from the colonial politics of recognition. This dissertation engages with literature in political theory, critical museum studies, Indigenous political thought, and the colonial politics of recognition. In the first two chapters I examine three logics of settler colonialism: disappearance, appropriation and obfuscation. I put this theoretical framework in conversation with three case studies. I look at the 1988 exhibition “The Spirit Sings: Artistic Traditions of Canada’s First Peoples” to examine the turn towards the settler colonial politics of recognition. The second case study, a multi-sited exhibition called “De T’a Hoti Ts’eeda: We live securely by the land” (Yellowknife and Ottawa) and “Extremes: Life in Subarctic Canada,” (Edinburgh) is used to think through multiple experiences of collaborative exhibition. The third case study is the “Gwich’in Caribou Skin Clothing Project” (2000-2003), exemplifying the role of knowledge repatriation projects for supporting Indigenous decolonial resurgence. The final two chapters of the dissertation examine how Indigenous peoples relationships with museums counter the logics of settler colonialism. I use the collection of Athabaskan Dene objects at the National Museums Scotland (Edinburgh) and the “nation-to-nation” relationship established between the Tłı̨chǫ Government and the museum as exemplary of relationships exogenous to settler colonial domination. Second, drawing on Hegel’s master/slave dialectic I offer a theory of “labour against recognition,” where the process of making objects is generative of relationships that simultaneously turn away from the colonial politics of recognition and foster a decolonial politics of Indigenous resurgence.
Whole blood flow cytometry protocol for the assessment of platelet phenotype, function, and cellular interactions
Creators: name: Yaw, Hui Ping
name: Van Den Helm, Suelyn
name: Linden, Matthew
name: Monagle, Paul
name: Ignjatovic, Vera
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Pharmacology
subject: Biotechnology
subject: Evolutionary Biology
subject: Developmental Biology
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Hematology
subject: 110309 Infectious Diseases

description: Platelets are a key component of the hemostatic system and their roles in inflammation via interactions with leukocytes have also gained attention in recent years. Changes in platelet phenotype and function can cause bleeding and/or thrombosis and, as such, monitoring platelet-specific changes is crucial to assessing hemostasis in the clinical setting. Currently, available platelet function tests such as platelet aggregometry and thromboelastography require a large volume of blood, which is a major limitation for the pediatric population. Whole blood flow cytometric analysis of platelets is increasingly utilized in recent years, primarily due to the sensitivity of this method, but also because it only requires a small amount of blood with minimal sample manipulation. We have developed a whole blood flow cytometry methodological approach that enables the assessment of platelet phenotype, function, and their interactions with monocytes and neutrophils.
Toward accurate measurement of property-dependent galaxy clustering: II. Tests of the smoothed density-corrected $V_{\rm max}$ method
Creators: name: Yang, Lei
name: Li, Zhigang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a smoothed density-corrected $V_{\rm max}$ technique for building a random catalog for property-dependent galaxy clustering estimation. This approach is essentially based on the density-corrected $V_{\rm max}$ method of Cole(2011), with three improvements to the original method. To validate the improved method, we generate two sets of flux-limited samples from two independent mock catalogs with different $k+e$ corrections. By comparing the two-point correlation functions, our results demonstrate that the random catalog created by the smoothed density-corrected $V_{\rm max}$ approach provides a more accurate and precise measurement for both sets of mock samples than the commonly used $V_{\rm max}$ method and redshift shuffled method. For flux-limited samples and color-dependent subsamples, the accuracy for the projected correlation function is well constrained within $1\%$ on the scale $0.07 h^{-1}\rm Mpc - 30 h^{-1}\rm Mpc$. The accuracy of the redshift-space correlation function is less than $2\%$ as well. Currently, it is the only approach that holds promise for achieving the goal of high-accuracy clustering measures for next-generation surveys.
description: 18 pages, 12 figures, corrected typos, published version. Comments welcome!
Multiple stellar populations and their influence on blue stragglers
Creators: name: Glebbeek, Evert
name: Sills, Alison
name: Leigh, Nathan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: It has become clear in recent years that globular clusters are not simple stellar populations, but may host chemically distinct sub-populations, typically with an enhanced helium abundance. These helium-rich populations can make up a substantial fraction of all cluster stars. One of the proposed formation channels for blue straggler stars is the physical collision and merger of two stars. In the context of multiple populations, collisions between stars with different helium abundances should occur and contribute to the observed blue straggler population. This will affect the predicted blue straggler colour and luminosity function. We quantify this effect by calculating models of mergers resulting from collisions between stars with different helium abundances and using these models to model a merger population. We then compare these results to four observed clusters, NGC 1851, NGC 2808, NGC 5634 and NGC 6093. As in previous studies our models deviate from the observations, particularly in the colour distributions. However, our results are consistent with observations of multiple populations in these clusters. In NGC 2808, our best fitting models include normal and helium enhanced populations, in agreement with helium enhancement inferred in this cluster. The other three clusters show better agreement with models that do not include helium enhancement. We discuss future prospects to improve the modelling of blue straggler populations and the role that the models we present here can play in such a study.
description: 10 pages, 7 figures, 6 tables Accepted for publication in MNRAS, 15 June 2010
Relative Time-of-Flight Measurement in an Ultrafast Electron Microscope
Creators: name: Chen, Jialiang
name: Willis, Simon A.
name: Flannigan, David J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Efforts to push the spatiotemporal imaging-resolution limits of femtosecond (fs) laser-driven ultrafast electron microscopes (UEMs) to the combined angstrom-fs range will benefit from stable sources capable of generating high bunch charges. Recent demonstration of unconventional off-axis photoemitting geometries are promising, but connections to the observed onset of structural dynamics are yet to be established. Here we use the in-situ photoexcitation of coherent phonons to quantify the relative time-of-flight (r-TOF) of photoelectron packets generated from the Ni Wehnelt aperture and from a Ta cathode set-back from the aperture plane. We further support the UEM experiments with particle-tracing simulations of the precise electron-gun architecture and photoemitting geometries. In this way, we measure discernable shifts in electron-packet TOF of tens of picoseconds for the two photoemitting surfaces. These shifts arise from the impact the Wehnelt-aperture off-axis orientation has on the electron-momentum distribution, which modifies both the collection efficiency and the temporal-packet distribution relative to on-axis emission. Future needs are identified; we expect this and other developments in UEM electron-gun configuration to expand the range of materials phenomena that can be directly imaged on scales commensurate with fundamental structural dynamics.
Replication Attack Mitigations for Static and Mobile WSN
Creators: name: Manjula, V.
name: Chellappan, Dr. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cryptography and Security (cs.CR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Security is important for many sensor network applications. Wireless Sensor Networks (WSN) are often deployed in hostile environments as static or mobile, where an adversary can physically capture some of the nodes. once a node is captured, adversary collects all the credentials like keys and identity etc. the attacker can re-program it and replicate the node in order to eavesdrop the transmitted messages or compromise the functionality of the network. Identity theft leads to two types attack: clone and sybil. In particularly a harmful attack against sensor networks where one or more node(s) illegitimately claims an identity as replicas is known as the node replication attack. The replication attack can be exceedingly injurious to many important functions of the sensor network such as routing, resource allocation, misbehavior detection, etc. This paper analyzes the threat posed by the replication attack and several novel techniques to detect and defend against the replication attack, and analyzes their effectiveness in both static and mobile WSN.
description: 12 pages
Segmental and prosodic complexity in Nivaĉle : laryngeals, laterals, and metathesis
Creators: name: Gutiérrez, Analía
Publisher: name: University of British Columbia
Year: 2015

description: This dissertation investigates a series of phonological and phonetic aspects of Nivaĉle, a Mataguayan language spoken in the Argentinean and Paraguayan Chaco. The data is based on original fieldwork done by the author, with several Nivaĉle speakers in the communities of Uj’e Lhavos and Santa Teresita (Paraguay). This research has a twofold contribution. On the one hand, it adds to the documentation of an endangered and understudied Chaco language. On the other hand, it deepens our understanding of Nivaĉle segmental phonology and advances an Optimality Theoretic analysis of Nivaĉle prosodic phonology. One of the central topics of this dissertation is the interaction between prosodic constituency, stress, and the realization of the constricted glottis ([c.g.]) feature in vowels. Contra Stell (1989), I propose that there is no phonological opposition between modal vowels vs glottalized vowels; rather, Nivaĉle glottalized vowels are sequences of /Vʔ/, a vowel plus moraic glottal stop with different prosodic parsings. A superficially complex stress system in Nivaĉle is shown to reduce to systematic regularities of three types. First, it is shown that stress is quantity-sensitive, with a consistent correlation between bimoraic weight (tautosyllabic /Vʔ/) and stress prominence. Secondly, primary/secondary stress patterns reflect competing edge-alignment constraints where prosodic foot domains align with internal morphological category (MCat) edges. Thirdly, it is argued that a CVC syllable, which constitutes the Minimal Prosodic Word in Nivaĉle, can function as a degenerate foot. The generalization that it characteristically surfaces with secondary (rather than primary) stress is shown to be an emergent consequence of independently motivated constraint rankings. With regards to the Nivaĉle lateral obstruents,it is argued that the typologically rare velar lateral /k͡l/ is a complex segment that is the diachronic result of lateral hardening of Proto-Mataguayan *l. Based on its phonological patterning, it is proposed that /k͡l/ is specified for DORSAL and [lateral]. Integrating multiple facets of these prosodic and segmental analyses, vowel-consonant metathesis further deepens our understanding of the complex interplay of Nivaĉle phonological constraints. Metathesis is shown to be motivated by satisfaction of the Syllable Contact Law, interacting with constraints governing complex codas, derived complex onsets, epenthesis, and deglottalization.
Functional analysis of germline ETV6 W380R mutation causing inherited thrombocytopenia and secondary acute lymphoblastic leukemia or essential thrombocythemia
Creators: name: Kozubik, Katerina Stano
name: Radova, Lenka
name: Reblova, Kamila
name: Smida, Michal
name: Kubricanova, Marketa Zaliova
name: Baloun, Jiri
name: Pesova, Michaela
name: Vrzalova, Zuzana
name: Folber, Frantisek
name: Mejstrikova, Sona
name: Pospisilova, Sarka
name: Doubek, Michael
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Hematology
subject: 60506 Virology

description: Germline mutations in ETV6 gene cause inherited thrombocytopenia with leukemia predisposition. Here, we report on functional validation of ETV6 W380R mutation segregating with thrombocytopenia in a family where two family members also suffered from acute lymphoblastic leukemia (ALL) or essential thrombocythemia (ET). In-silico analysis predicted impaired DNA binding due to W380R mutation. Functional analysis showed that this mutation prevents the ETV6 protein from localizing into the cell nucleus and impairs the transcriptional repression activity of ETV6. Based on the germline ETV6 mutation, ET probably started with somatic JAK2 V617F mutation, whereas ALL could be caused by diverse mechanisms: high-hyperdiploidity; somatic deletion of exon 1 IKZF1 gene; or somatic mutations of other genes found by exome sequencing of the ALL sample taken at the diagnosis.
Clock-line-mediated Sisyphus Cooling
Creators: name: Chen, Chun-Chia
name: Siegel, Jacob L.
name: Hunt, Benjamin D.
name: Grogan, Tanner
name: Hassan, Youssef S.
name: Beloy, Kyle
name: Gibble, Kurt
name: Brown, Roger C.
name: Ludlow, Andrew D.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We demonstrate sub-recoil Sisyphus cooling using the long-lived $^{3}\mathrm{P}_{0}$ clock state in alkaline-earth-like ytterbium. A 1388 nm optical standing wave nearly resonant with the $^{3}\textrm{P}_{0}$$\,\rightarrow$$\,^{3}\textrm{D}_{1}$ transition creates a spatially periodic light shift of the $^{3}\textrm{P}_{0}$ clock state. Following excitation on the ultranarrow clock transition, we observe Sisyphus cooling in this potential, as the light shift is correlated with excitation to $^{3}\textrm{D}_{1}$ and subsequent spontaneous decay to the $^{1}\textrm{S}_{0}$ ground state. We observe that cooling enhances the loading efficiency of atoms into a 759 nm magic-wavelength one-dimensional (1D) optical lattice, as compared to standard Doppler cooling on the $^{1}\textrm{S}_{0}$$\,\rightarrow\,$$^{3}\textrm{P}_{1}$ transition. Sisyphus cooling yields temperatures below 200 nK in the weakly confined, transverse dimensions of the 1D optical lattice. These lower temperatures improve optical lattice clocks by facilitating the use of shallow lattices with reduced light shifts, while retaining large atom numbers to reduce the quantum projection noise. This Sisyphus cooling can be pulsed or continuous and is applicable to a range of quantum metrology applications.
description: 8 pages, 6 figures
Single-shot refractive index slice imaging using spectrally multiplexed optical transfer function reshaping
Creators: name: Lee, Chungha
name: Hugonnet, Herve
name: Park, Juyeon
name: Lee, Mahn Jae
name: Park, Weisun
name: Park, Yongkeun
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Image and Video Processing (eess.IV)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The refractive index (RI) of cells and tissues is crucial in pathophysiology as a noninvasive and quantitative imaging contrast. Although its measurements have been demonstrated using three-dimensional quantitative phase imaging methods, these methods often require bulky interferometric setups or multiple measurements, which limits the measurement sensitivity and speed. Here, we present a single-shot RI imaging method that visualizes the RI of the in-focus region of a sample. By exploiting spectral multiplexing and optical transfer function engineering, three color-coded intensity images of a sample with three optimized illuminations were simultaneously obtained in a single-shot measurement. The measured intensity images were then deconvoluted to obtain the RI image of the in-focus slice of the sample. As a proof of concept, a setup was built using Fresnel lenses and a liquid-crystal display. For validation purposes, we measured microspheres of known RI and cross-validated the results with simulated results. Various static and highly dynamic biological cells were imaged to demonstrate that the proposed method can conduct single-shot RI slice imaging of biological samples with subcellular resolution.