cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Deep Reinforcement Learning with Embedded LQR Controllers
Creators: name: Caarls, Wouter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Reinforcement learning is a model-free optimal control method that optimizes a control policy through direct interaction with the environment. For reaching tasks that end in regulation, popular discrete-action methods are not well suited due to chattering in the goal state. We compare three different ways to solve this problem through combining reinforcement learning with classical LQR control. In particular, we introduce a method that integrates LQR control into the action set, allowing generalization and avoiding fixing the computed control in the replay memory if it is based on learned dynamics. We also embed LQR control into a continuous-action method. In all cases, we show that adding LQR control can improve performance, although the effect is more profound if it can be used to augment a discrete action set.
description: This work has been accepted to IFAC for publication under a Creative Commons Licence CC-BY-NC-ND
Brain responses to the perception of dyadic gaze interactions: the role of adult attachment
Creators: name: Iannoni, Maria Elena
name: Cecchini, Marco
name: Pandolfo, Anna Lucia
name: Aceto, Paola
name: Lai, Carlo
Publisher: name: F1000Research
Year: 2015

description: This study investigated the time course of brain processes involved in the visual perception of different gaze interactions in woman–child dyads and the association between attachment dimensions and brain activation during the presentation of gaze interactions by using ERP and sLORETA methodology.
Cosmological 3D HI Gas Map with HETDEX Ly$α$ Emitters and eBOSS QSOs at $z=2$: IGM-Galaxy/QSO Connection and a $\sim$ 40-Mpc Scale Giant HII Bubble Candidate
Creators: name: Mukae, Shiro
name: Ouchi, Masami
name: Hill, Gary J.
name: Gebhardt, Karl
name: Cooper, Erin Mentuch
name: Jeong, Donghui
name: Saito, Shun
name: Fabricius, Maximilian
name: Gawiser, Eric
name: Ciardullo, Robin
name: Farrow, Daniel
name: Davis, Dustin
name: Zeimann, Greg
name: Finkelstein, Steven L.
name: Gronwall, Caryl
name: Liu, Chenxu
name: Zhang, Yechi
name: Byrohl, Chris
name: Ono, Yoshiaki
name: Schneider, Donald P.
name: Jarvis, Matt J.
name: Casey, Caitlin M.
name: Mawatari, Ken
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present cosmological ($30-400$ Mpc) distributions of neutral hydrogen (HI) in the inter-galactic medium (IGM) traced by Ly$α$ Emitters (LAEs) and QSOs at $z=2.1-2.5$, selected with the data of the on-going Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) and the eBOSS survey. We investigate spatial correlations of LAEs and QSOs with HI tomography maps reconstructed from HI Ly$α$ forest absorption in the spectra of background galaxies and QSOs obtained by the CLAMATO survey and this study, respectively. In the cosmological volume far from QSOs, we find that LAEs reside in regions of strong HI absorption, i.e. HI rich, which is consistent with results of previous galaxy-background QSO pair studies. Moreover, there is an anisotropy in the HI-distribution plot of transverse and line-of-sight distances; on average the HI absorption peak is blueshifted by $\sim 200$ km s$^{-1}$ from the LAE Ly$α$ redshift, reproducing the known average velocity offset between the Ly$α$ emission redshift and the galaxy systemic redshift. We have identified a $\sim$ 40-Mpc scale volume of HI underdensity that is a candidate for a giant HII bubble, where six QSOs and an LAE overdensity exist at $\left < z \right > =2.16$. The coincidence of the QSO and LAE overdensities with the HI underdensity indicates that the ionizing photon radiation of the QSOs has created a highly ionized volume of multiple proximity zones in a matter overdensity. Our results suggest an evolutionary picture where HI gas in an overdensity of galaxies becomes highly photoionized when QSOs emerge in the galaxies.
description: 26 pages, 19 figures. Accepted for Publication in ApJ
Secrecy extraction from no-signalling correlations
Creators: name: Scarani, Valerio
name: Gisin, Nicolas
name: Brunner, Nicolas
name: Masanes, Lluis
name: Pino, Sergi
name: Acin, Antonio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum cryptography shows that one can guarantee the secrecy of correlation on the sole basis of the laws of physics, that is without limiting the computational power of the eavesdropper. The usual security proofs suppose that the authorized partners, Alice and Bob, have a perfect knowledge and control of their quantum systems and devices; for instance, they must be sure that the logical bits have been encoded in true qubits, and not in higher-dimensional systems. In this paper, we present an approach that circumvents this strong assumption. We define protocols, both for the case of bits and for generic $d$-dimensional outcomes, in which the security is guaranteed by the very structure of the Alice-Bob correlations, under the no-signalling condition. The idea is that, if the correlations cannot be produced by shared randomness, then Eve has poor knowledge of Alice's and Bob's symbols. The present study assumes, on the one hand that the eavesdropper Eve performs only individual attacks (this is a limitation to be removed in further work), on the other hand that Eve can distribute any correlation compatible with the no-signalling condition (in this sense her power is greater than what quantum physics allows). Under these assumptions, we prove that the protocols defined here allow extracting secrecy from noisy correlations, when these correlations violate a Bell-type inequality by a sufficiently large amount. The region, in which secrecy extraction is possible, extends within the region of correlations achievable by measurements on entangled quantum states.
description: 23 pages, 4 figures
More than survival : literary representations of Indigenous women in 21st century México
Creators: name: Sánchez Flores, Jessica L.
name: 0000-0002-2969-8305
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: Mexico
Indigenous
Women
Strong
Gendered violence
Survival
Formal education
Sex
Pleasure

description: In this dissertation, I engage in an interdisciplinary and critical conversation on contemporary Indigenous cultural production, with particular emphasis on gendered violence, self-representation, and survivance. Gerald Vizenor (2008) coined the term survivance, and it centers Indigenous stories beyond victimhood (1). In my dissertation, I show how Indigenous people of México use literature to navigate and critique landscapes of violence and dispossession while simultaneously proposing a vision of survivance rather than perpetual victimhood. Various scholars have studied Indigenous women’s self-representation and their creative work in Latin America (Arias, 2013; McDonough 2014; Coon 2015; del Valle Escalante, 2015; Chacón, 2018). In my dissertation, I move these discussions forward by focusing on the various ways Indigenous women challenge expectations (Deloria 2004) both in their own communities and beyond. I analyze the works created by Indigenous individuals affiliated with the three most spoken Indigenous languages in México–Nahuatl, Zapotec, and Maya. In the first chapter, I focus on well-known Nahua playwright Ildefonso Maya Hernández's play Pitah Chacatzintla (1964; 1971) which presents us with a window into the life of a Nahua woman in the 1960s. In the second chapter I analyze Maya Yucatec author Sol Ceh Moo’s bilingual (Spanish and Maya Yucatec) novel Chen tumeen chu’úpen…/Sólo por ser mujer (2015) and the ways Honorina’s character challenges multiple violence(s). In the third chapter, I discuss Indigenous women and pleasure with Zapotec poet Irma Pineda’s erotic poetry book Naxiña’ Rului’ladxe’ / Rojo Deseo (2018). Moreover, I underline how the protagonists negotiate dominant-culture expectations and promote their own narratives and representations of indigeneity in México from the 1960s to the present day. As a move toward an anti-colonial methodology, cosas de mujeres (women’s things) helps me build a theoretical framework based on lived female experiences. I participated in actions such as sewing and cooking as generative, knowledge-producing activities that often occur in the kitchen to co-create knowledge(s) with them (Brooks 2006). In sum, this project sheds new light on contemporary Nahua, Zapotec, and Maya protagonists as weavers of their own stories, who are a part of, and significant contributors to Mexican society and the world at large.
An exploration of the role of the rabbi’s wife
Creators: name: Landau-Chark, Susan Janette
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study is to explore the role of the rabbinical wife. I first utilized a number of historical studies to aid in situating the rabbinical wife at different points in Jewish history. Certain general characteristics of their role in the community were noted. Their activities extended beyond those traditionally associated with Jewish women. The differences in this role was linked, to an extent, to the shifting role of the rabbis themselves. Unfortunately, most of the primary historical documents have been written by men, and thus shed limited light on these women's actual experiences. The contemporary perspective was obtained through interviews. Six women married to congregational rabbis met with the researcher. The wives were asked to respond to a series of questions that addressed aspects of their lives as rabbinical wives. Two interviews were conducted. The initial interview was tape-recorded and transcribed. The transcripts were then used in a follow-up interview to clarify issues that arose during the initial interview. The results from these interviews allow us to hear from the women themselves. The wives of the rabbis expressed ambivalence about their leadership. People approach the rabbi's wife with a variety of questions. She herself has a strong Jewish education, but despite her knowledge she has no official status within the Jewish community. She can respond to only the most basic questions. In her private life, the rabbinical wife is gracious and attentive to the needs of the community and will frequently have people in her home for religious and social events. At the same time, her position inhibits deep relationships with the people around her. This research provides the detail on the role of the rabbinical wife, and contributes to a feminist re-reading of the history of religious leadership in the Jewish community.
Letter from S.C. Smith Lumber Company to Rainbow Ranche, April 18th, 1908
Creators: name: S.C. Smith Lumber Co.
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to the "gentlemen" at Rainbow Ranche from S.C Smith Lumber Company, dated April 18, 1908; written on the company's letter head. The letter regards the order sent on the 16th, requesting clarification of sizes of the materials needed.
Attitudes to Genetically Modified Food over Time: How Trust in Organizations and the Media Cycle Predict Support
Creators: name: Marques, Mathew
name: CR Critchley
name: J Walshe
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: © The Author(s) 2014 This research examined public opinion toward genetically modified plants and animals for food, and how trust in organizations and media coverage explained attitudes toward these organisms. Nationally representative samples (N = 8821) over 10 years showed Australians were less positive toward genetically modified animals compared to genetically modified plants for food, especially in years where media coverage was high. Structural equation modeling found that positive attitudes toward different genetically modified organisms for food were significantly associated with higher trust in scientists and regulators (e.g. governments), and with lower trust in watchdogs (e.g. environmental movement). Public trust in scientists and watchdogs was a stronger predictor of attitudes toward the use of genetically modified plants for food than animals, but only when media coverage was low. Results are discussed regarding the moral acceptability of genetically modified organisms for food, the media’s role in shaping public opinion, and the role public trust in organizations has on attitudes toward genetically modified organisms.
"How will this reflect on the family" Lokeen Kee Kehan Gay? Indo-Canadian parents and adolescents : Intergenerational differences and health factors
Creators: name: Lerch, Noreen Marie
Publisher: name: University of British Columbia
Year: 2009

description: In this study, intergenerational conflict or disagreement between Indo-Canadian parents and their daughters was examined. The purpose was to elicit participants' perceptions of conflicts or disagreements as experienced within the context of their culture and as described by themselves, to identify health problems which participants believed to be related to the issues, to identify processes that families use to seek solutions, and to identify implications for nursing, health practice and research. The questions were addressed through a qualitative ethnographic approach. The study was guided by the writings of Anderson (1985, 1990), Kleinman, (1978) and Leininger (1978,1991) and Kleinman's Explanatory Model Framework of the Socio-Cultural Context of Health (1978). For data collection, two sources of data were used. In-depth semi-structured interviews with Indo-Canadian parents and with Indo-Canadian adolescents and young women were conducted over a period of ten weeks. Participant observation at three Indo-Canadian youth and parent symposia provided another rich source of data. The researcher actively participated in discussion groups of parents and adolescents and young women at the symposiums. Field notes were written at the symposia and shared with the participants for purposes of validation and in order to assist the group to write a report and recommendations from the symposia. The data from the field notes and the interview transcripts were analyzed through a qualitative process of content analysis as described by Lindlof (1995) and Hammersley & Atkinson, (1992). From this analysis, the participants' explanatory framework was identified. The two main concepts of this framework which explain the perspectives of the participants were Bridging Two Cultures and Lokeen Kee Kehan Gay, "What will the community think?" or " How will this reflect on the family?" Within these, other themes emerged: family and cultural values, issues from the perspective of daughters and mothers and primarily related to gender issues, living in two cultures, learning and negotiating boundaries, working out conflicts, health problems, and access to help. The interdependence of Lokeen Kee Kehan Gay and living in two cultures was examined in relation to the function of gender roles in women's lives. Implications for nursing and health practice, education and research concluded this study.
Analysis of Granular Flow in a Pebble-Bed Nuclear Reactor
Creators: name: Rycroft, Chris H.
name: Grest, Gary S.
name: Landry, James W.
name: Bazant, Martin Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Pebble-bed nuclear reactor technology, which is currently being revived around the world, raises fundamental questions about dense granular flow in silos. A typical reactor core is composed of graphite fuel pebbles, which drain very slowly in a continuous refueling process. Pebble flow is poorly understood and not easily accessible to experiments, and yet it has a major impact on reactor physics. To address this problem, we perform full-scale, discrete-element simulations in realistic geometries, with up to 440,000 frictional, viscoelastic 6cm-diameter spheres draining in a cylindrical vessel of diameter 3.5m and height 10m with bottom funnels angled at 30 degrees or 60 degrees. We also simulate a bidisperse core with a dynamic central column of smaller graphite moderator pebbles and show that little mixing occurs down to a 1:2 diameter ratio. We analyze the mean velocity, diffusion and mixing, local ordering and porosity (from Voronoi volumes), the residence-time distribution, and the effects of wall friction and discuss implications for reactor design and the basic physics of granular flow.
description: 18 pages, 21 figures
Dipole-Deformed Bound States and Heterotic Kodaira Surfaces
Creators: name: Dasgupta, Keshav
name: Guffin, Josh
name: Gwyn, Rhiannon
name: Katz, Sheldon
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a particular N = 1 confining gauge theory with fundamental flavors realised as seven branes in the background of wrapped five branes on a rigid two-cycle of a non-trivial global geometry. In parts of the moduli space, the five branes form bound states with the seven branes. We show that in this regime the local supergravity solution is surprisingly tractable, even though the background topology is non-trivial. New effects such as dipole deformations may be studied in detail, including the full backreactions. Performing the dipole deformations in other ways leads to different warped local geometries. In the dual heterotic picture, which is locally given by a C* fibration over a Kodaira surface, we study details of the geometry and the construction of bundles. We also point out the existence of certain exotic bundles in our framework.
description: 40 pages, 3 .eps figures, Harvmac
Wideband millimeter-wave vehicular communications using online machine learning
Creators: name: Kim, Dohyun
name: 0000-0003-0809-8885
Publisher: name: The University of Texas at Austin
Year: 2023
Subjects: MmWave MIMO communication
3GPP NR V2X
Relay selection
Deep reinforcement learning
Band assignment
Hierarchical reinforcement learning

description: High data rate communication enables vehicles to perform intelligent services. Leveraging millimeter-wave (mmWave) multiple-input-multiple-output (MIMO) technology, vehicles can effectively transmit and receive sensor data from a variety of sources such as cameras, lidar, and radar. The directionality of mmWave MIMO communication, however, necessitates on-the-fly beam designs to tackle mobility and blockage in vehicular scenarios. The inherent complexity of vehicle dynamics makes this design problem a challenging sequential decision-making task. Consequently, there is a strong motivation to adopt an online learning approach that can simultaneously tackle blockage mitigation and beam management in real-time. In this dissertation, I first explore the joint relay selection and beam management in mmWave vehicular networks with analog beamforming architecture using deep reinforcement learning (DRL). The objective is to dynamically initiate beam-based transmission, track beams, and execute relay switching with minimal overhead. An integral component of the DRL algorithm involves acquiring the capability to learn adaptive thresholds that govern the decision-making process for relay switching and beam realignment. Furthermore, I propose a joint band assignment and beam management algorithm to maximize the data rate in multi-band vehicular networks with hybrid beamforming architecture. This problem necessitates effective handling of the distinct beam management procedures across bands without excessively expanding the action space. To address this, I exploit hierarchy in decision-making and develop a hierarchical reinforcement learning (HRL) algorithm to learn band assignment in the upper level and beam management in the lower level. Lastly, I revisit the mmWave joint relay selection and beam management, focusing on the beam squint effect. Array architectures based on phase shifters are susceptible to discrepancies between the steering angle and beam direction, known as beam squint, especially as the number of antennas or bandwidth increases. To address this issue in wideband communication and massive MIMO systems, I propose a learning algorithm to compute the delay-phase profile to use both true-time-delay and phase shifter arrays.
The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5
Creators: name: Urquhart, Ryan
name: Bahramian, Arash
name: Strader, Jay
name: Chomiuk, Laura
name: Ransom, Scott M.
name: Wang, Yuankun
name: Heinke, Craig O.
name: Tudor, Vlad
name: Miller-Jones, James C. A.
name: Tetarenko, Alexandra J.
name: Maccarone, Thomas J.
name: Sivakoff, Gregory R.
name: Shishkovsky, Laura
name: Swihart, Samuel J.
name: Tremou, Evangelia
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars known among Galactic globular clusters. Here we report new deep $2-8\,$GHz radio continuum observations of Terzan\,5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sources within the cluster half-light radius, including 17 within the core radius. 19 are associated with previously studied millisecond pulsars and X-ray binaries. Three of the new radio sources have steep radio spectra and are located within the cluster core, as expected for millisecond pulsars. These three sources have hard X-ray photon indices ($Γ=1.3-1.5$) and highly variable X-ray emission, suggesting they are binary millisecond pulsars belonging to the spider class. For the most X-ray luminous of these sources, the redback spider classification is confirmed by its X-ray light curve, which shows an orbital period of 12.32 hr and double peaked structure around X-ray maximum. The likely discovery of bright binary millisecond pulsars in a well-studied cluster like Terzan 5 highlights how deep radio continuum imaging can complement pulsar search and timing observations in finding probable eclipsing systems. The other new radio source in the core has a flat radio spectrum and is X-ray faint ($L_X \approx 2\times 10^{31}$ erg s$^{-1}$) with a photon index $Γ=2.1\pm0.5$, consistent with the properties expected for a quiescent stellar-mass black hole X-ray binary.
description: 19 pages, 12 figures, 3 tables. Accepted for publication in ApJ
Kar'úk songs with narrative supplement
Creators: name: Cachora, Ignatius
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. Date range represents each side of tape. Side B is described as "supplement." Digitization by The Audio Archive (Burlingame, California).
Scaling in a general class of critical random Boolean networks
Creators: name: Mihaljev, Tamara
name: Drossel, Barbara
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive analytically the scaling behavior in the thermodynamic limit of the number of nonfrozen and relevant nodes in the most general class of critical Kauffman networks for any number of inputs per node, and for any choice of the probability distribution for the Boolean functions. By defining and analyzing a stochastic process that determines the frozen core we can prove that the mean number of nonfrozen nodes in any critical network with more than one input per node scales with the network size $N$ as $N^{2/3}$, with only $N^{1/3}$ nonfrozen nodes having two nonfrozen inputs and the number of nonfrozen nodes with more than two inputs being finite in the thermodynamic limit. Using these results we can conclude that the mean number of relevant nodes increases for large $N$ as $N^{1/3}$, with only a finite number of relevant nodes having two relevant inputs, and a vanishing fraction of nodes having more than three of them. It follows that all relevant components apart from a finite number are simple loops, and that the mean number and length of attractors increases faster than any power law with network size.
description: 11 pages
Thinking spaces : a practice-led enquiry into representations of memory and thought
Creators: name: Brooke, Julie Helen
Publisher: name: The Australian National University
Year: 2013
Subjects: subject: Art, Modern Themes, motives
subject: Imagery (Psychology) in art
subject: Mental representation
subject: Visualization

description: This practice-led thesis investigates parallels between research in science and in the visual arts, and explores how thought can be represented in visual form. The project developed from a fascination with logic diagrams and the memory palace, an ancient technique for extending the capacity of the mind to store information. The aim is to develop images of 'impossible objects' that are analogous to scientific hypotheses, and to explore how the apparently cool logic of an experimental system can lead to a compulsive reworking of ideas that may be anything but rational. This exploration takes the form of multiple extended series of small pencil and gouache works, in which the paper ground becomes a space in which to model and reflect on the processes of thought.
Squeezed vacuum as a universal quantum probe
Creators: name: Gaiba, Roberto
name: Paris, Matteo G A
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We address local quantum estimation of bilinear Hamiltonians probed by Gaussian states. We evaluate the relevant quantum Fisher information (QFI) and derive the ultimate bound on precision. Upon maximizing the QFI we found that single- and two-mode squeezed vacuum represent an optimal and universal class of probe states, achieving the so-called Heisenberg limit to precision in terms of the overall energy of the probe. We explicitly obtain the optimal observable based on the symmetric logarithmic derivative and also found that homodyne detection assisted by Bayesian analysis may achieve estimation of squeezing with near-optimal sensitivity in any working regime. Besides, by comparison of our results with those coming from global optimization of the measurement we found that Gaussian states are effective resources, which allow to achieve the ultimate bound on precision imposed by quantum mechanics using measurement schemes feasible with current technology.
description: revised version, 2 figures
Compensation engineering for silicon solar cells
Creators: name: Forster, Maxime
Publisher: name: The Australian National University
Year: 2012
Subjects: subject: Silicon solar cells Design
subject: Silicon crystals
subject: Photovoltaic cells Materials.
subject: Gallium

description: This thesis focuses on the effects of dopant compensation on the electrical properties of crystalline silicon relevant to the operation of solar cells. We show that the control of the net dopant density, which is essential to the fabrication of high-efficiency solar cells, is very challenging in ingots crystallized with silicon feedstock containing both boron and phosphorus such as upgraded metallurgical-grade silicon. This is because of the strong segregation of phosphorus which induces large net dopant density variations along directionally solidified silicon crystals. To overcome this issue, we propose to use gallium co-doping during crystallization, and demonstrate its potential to control the net dopant density along p-type and n-type silicon ingots grown with silicon containing boron and phosphorus. The characteristics of the resulting highly-compensated material are identified to be: a strong impact of incomplete ionization of dopants on the majority carrier density, an important reduction of the mobility compared to theoretical models and a recombination lifetime which is determined by the net dopant density and dominated after long-term illumination by the boron-oxygen recombination centre. To allow accurate modelling of upgraded-metallurgical silicon solar cells, we propose a parameterization of these fundamental properties of compensated silicon. We study the light-induced lifetime degradation in p-type and n-type Si with a wide range of dopant concentrations and compensation levels and show that the boron-oxygen defect is a grown-in complex involving substitutional boron and is rendered electrically active upon injection of carriers through a charge-driven reconfiguration of the defect. Finally, we apply gallium co-doping to the crystallization of upgraded-metallurgical silicon and demonstrate that it allows to significantly increase the tolerance to phosphorus without compromising neither the ingot yield nor the solar cells performance before light-induced degradation.
Holographic 2-Point Functions in the Pseudo-Conformal Universe
Creators: name: Carrillo-Gonzalez, Mariana
name: Hinterbichler, Kurt
name: Stokes, James
name: Trodden, Mark
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We holographically calculate two-point functions in the pseudo-conformal universe, an early universe alternative to inflation. The pseudo-conformal universe can be modeled as a defect conformal field theory, where the reheating surface is a codimension-1 spacelike defect which breaks the conformal algebra to a de Sitter subalgebra. The dual spacetime geometries are domain walls with de-Sitter symmetry in an asymptotically anti-de Sitter spacetime. We compute 2-point functions of scalars and stress tensors by solving the linearized equations for scalar and tensor fluctuations about these backgrounds.
description: 32 pages, 1 figure
Non-Gaussianity and constraints for the variance of perturbations in the curvaton model
Creators: name: Valiviita, Jussi
name: Sasaki, Misao
name: Wands, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently, the primordial non-Gaussianity in the curvaton model has been predicted assuming sudden decay of the curvaton. We extend the calculation to non-instantaneous decay by employing delta N -formalism. The difference between the sudden-decay approximation and our numerical result is larger than 1% only if the non-linearity parameter is small, -1.16 < f_NL < 60. Thus it is safe to use the sudden-decay approximation when deriving constraints for the curvaton model from WMAP3 (f_NL < 114), but with the Planck forecast |f_NL| <5 one should employ the fully numerical result. Often, the curvaton perturbations $δσ$ have been assumed to be small compared to the background value of the curvaton field $σ_0$. Consequently, the variance $Δ^2 = / σ_0^2$ has been assumed to be negligible. However, the measurements of CMB or large-scale structure perturbation amplitude do not constrain the variance if the main contribution to it comes from the ultraviolet (UV) scales, i.e., from smaller than observable scales. We discuss how, even in this case, observational constraints on non-Gaussianity set an upper bound to the small scale variance, Delta^2_UV < 90.
description: 5 pages, 2 figures
Kar'úk with songs
Creators: name: Cachora, Ignatius
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. Date range represents each side of tape. Side B is songs. For associated notebooks, see Margaret Langdon Papers (Bancroft Library), carton 9, folders 46-50. Digitization by The Audio Archive (Burlingame, California).
Operational forecast of the PSF figures of merit
Creators: name: Turchi, A.
name: Agapito, G.
name: Masciadri, E.
name: Beltramo-Martin, O.
name: Pinna, E.
name: Sauvage, J. F.
name: Fusco, T.
name: Neichel, B.
name: Milli, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The optimization and scheduling of scientific observations done with instrumentation supported by adaptive optics could greatly benefit from the forecast of PSF figures of merit (FWHM, Strehl Ratio, Encircle Energy and contrast), that depend on the AO instrument, the scientific target and turbulence conditions during the observing night. In this contribution we explore the the possibility to forecast a few among the most useful PSF figures of merit (SR and FWHM). To achieve this goal, we use the optical turbulence forecasted by the mesoscale atmospheric model Astro-Meso-NH on a short timescale as an input for PSF simulation software developed and tailored for specific AO instruments. A preliminary validation will be performed by comparing the results with on-sky measured PSF figures of merit obtained on specific targets using the SCAO systems SOUL (FLAO upgrade) feeding the camera LUCI at LBT and SAXO, the extreme SCAO system feeding the high resolution SPHERE instrument at VLT. This study will pave the way to the implementation of an operational forecasts of such a figure of merits on the base of existing operational forecast system of the atmosphere (turbulence and atmospheric parameters). In this contribution we focus our attention on the forecast of the PSF on-axis.
description: 9 pages, 3 figures, 2 tables
BURN SEVERITY ASSESSMENT IN UTTARKASHI DISTRICT, UTTARAKHAND USING SATELLITE IMAGERY AND REMOTE SENSING TECHNIQUES
Creators: name: SHIKHA GOSWAMI
name: ALAKNANDA ASHOK
Publisher: name: Zenodo
Year: 2024
Subjects: Burn Severity, Uttarakhand, Landsat-8, NBR, dNBR, NDVI, Forest Fires, Remote Sensing, Fire Monitoring.

description: Abstract

The Uttarakhand region, located in the Indian Himalayas, is highly susceptible to forest fires due to its unique climatic and topographic conditions. The increasing frequency and intensity of forest fires in Uttarkashi district of Uttarakhand, driven by climate change [1] and human activities, have caused significant damage to the region’s ecosystem. This research aims to utilize Landsat-8 satellite imagery to assess burn severity [18] in Uttarkashi district of Uttarakhand’s Forest regions. The study employs the Normalized Burn Ratio (NBR) [6] and its derivative, the differenced Normalized Burn Ratio (dNBR) [7], to quantify fire impact. These indices, derived from multispectral Landsat [24] [29] data, are powerful tools for evaluating the extent and intensity of fires. The analysis provides spatial patterns of fire damage over time, specifically from 2020 to 2024, and helps understand post-fire [27] regeneration and recovery processes. The research provides insights into the effectiveness of satellite data in burn severity mapping, assisting local authorities in managing forest recovery efforts and mitigating future fire hazards. The study of burn severity in Uttarkashi district from 2020 to 2024 shows significant fluctuations. In 2020, unburned areas accounted for the majority, while high severity fires affected 11%. By 2021, unburned areas increased to 35.89%, while high severity zones decreased to 6.15%. By 2022, high severity fires increased to 16.77%, while unburned areas increased to 30.35%. In 2024, unburned areas expanded to 44.91%.
Optical and infrared observations of the Type IIP SN2002hh from day 3 to 397
Creators: name: Pozzo, M.
name: Meikle, W. P. S.
name: Rayner, J. T.
name: Joseph, R. D.
name: Filippenko, A. V.
name: Foley, R. J.
name: Li, W.
name: Mattila, S.
name: Sollerman, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical and infrared (IR) observations of the type IIP SN2002hh from 3 to 397 days after explosion. The optical spectroscopic (4-397d) and photometric (3-278d) data are complemented by spectroscopic (137-381d) and photometric (137-314d) data acquired at IR wavelengths. This is the first time L-band spectra have ever been successfully obtained for a supernova at a distance beyond the Local Group. The VRI light curves in the first 40 days reveal SN2002hh to be a SN IIP (plateau) - the most common of all core-collapse supernovae. SN2002hh is one of the most highly extinguished supernovae ever investigated. To provide a good match between its early-time spectrum and a coeval spectrum of the Type IIP SN1999em, as well as maintaining consistency with KI interstellar absorption, we invoke a 2-component extinction model. One component is due to the combined effect of the interstellar medium of our Milky Way Galaxy and the SN host galaxy, while the other component is due to a "dust pocket" where the grains have a mean size smaller than in the interstellar medium. The early-time optical light curves of SNe 1999em and 2002hh are generally well-matched, as are the radioactive tails of these two SNe and SN1987A. The late-time similarity of the SN2002hh optical light curves to those of SN1987A, together with measurements of the optical/IR luminosity and [FeII] 1.257mu emission indicate that 0.07 +- 0.02 Msun of Ni 56 was ejected by SN2002hh. [... ABRIDGED...] From the [OI] 6300,6364 A doublet luminosity we infer a 16-18 Msun main-sequence progenitor star. The progenitor of SN2002hh was probably a red supergiant with a substantial, dusty wind.
description: 32 pages, 30 figures, accepted for publication in MNRAS
Gate-Tunable Quantum Anomalous Hall Effects in MnBi$_2$Te$_4$ Thin Films
Creators: name: Lei, Chao
name: MacDonald, Allan H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The quantum anomalous Hall (QAH) effect has recently been realized in thin films of intrinsic magnetic topological insulators (IMTIs) like MnBi$_2$Te$_4$. Here we point out that that the QAH gaps of these IMTIs can be optimized, and that both axion insulator/semimetal and Chern insulator/semimetal transitions can be driven by electrical gate fields on the $\sim 10$ meV/nm scale. This effect is described by combining a simplified coupled-Dirac-cone model of multilayer thin films with Schr{ö}dinger-Poisson self-consistent-field equations.
description: 13 pages, 3+6 figures
Crossover from Reptation to Rouse dynamics in the Extended Rubinstein-Duke Model
Creators: name: Drzewinski, Andrzej
name: van Leeuwen, J. M. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The competition between reptation and Rouse Dynamics is incorporated in the Rubinstein-Duke model for polymer motion by extending it with sideways motions, which cross barriers and create or annihilate hernias. Using the Density-Matrix Renormalization-Group Method as solver of the Master Equation, the renewal time and the diffusion coefficient are calculated as function of the length of the chain and the strength of the sideways motion. These new types of moves have a strong and delicate influence on the asymptotic behavior of long polymers. The effects are analyzed as function of the chain length in terms of effective exponents and crossover scaling functions.
description: 16 Pages RevTeX and 13 PostScript figures included, accepted for publication in Phys. Rev. E
Physical mapping and clone isolation from the telomeric region of human chromosome 8p
Creators: name: Ma, Lingli
Publisher: name: University of British Columbia
Year: 2009

description: Physical maps provide rapid access to any chromosomal region of interest, and serve as essential tools for the localization of genes. Of particular interest is the observation that gene clustering occurs in telomeric areas, although few genes have been mapped to the telomeric end of human chromosome 8p. In an effort to refine the physical map of 8pter-8p23, radiation hybrid mapping was used to determine the chromosomal order of ten sequence tagged sites (STSs) mapping to this interval. Four out of ten loci were positioned at 1,000:1 odds against order inversion, corroborating previously established linkage data. Secondly, STS content mapping in yeast artificial chromosomes (YACs) aided in the identification of potentially overlapping YACs, and a preliminary YAC contig of the region was generated. Six YACs constituting a "minimum tiling path" were selected. As cosmids provide the necessary reagents for detailed positional cloning strategies and genomic sequencing, the primary objective of this project was to isolate bins of cosmids mapping to 8pter-8p23. To achieve this goal, Alu PCR products derived from the minimum tiling path YACs were used as hybridization probes against a chromosome 8 specific cosmid library. The initial screening identified an average of over 300 cosmids per YAC. However, when a subset of positive cosmids was digested with EcoRl, Southern blotted and re-probed with the Alu PCR products, a false positive rate of 55% was observed. Probing the blots with total human DNA detected numerous fragments containing repetitive DNA. As a final analysis to confirm the identity of specific clones, cosmid EcoRl fragments were hybridized onto Southern blots containing EcoRl digested YAC DNA. Fragments which clearly demonstrated sequence homology to the corresponding YAC were strongly positive with the YAC Alu PCR probe but negative with the total human DNA probe in the preceding experiment, suggesting that unique sequences were being isolated. In contrast, sequence homology was not demonstrated by fragments that were strongly positive with both the Alu PCR and total human DNA probes. A single cosmid was also identified which confirmed the overlap relationship between two YACs that was originally suggested by STS content mapping.
Fermi surface and antiferromagnetism in the Kondo lattice: an asymptotically exact solution in d>1 Dimensions
Creators: name: Yamamoto, Seiji J.
name: Si, Qimiao
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Interest in the heavy fermion metals has motivated us to examine the quantum phases and their Fermi surfaces within the Kondo lattice model. We demonstrate that the model is soluble asymptotically exactly in any dimension d>1, when the Kondo coupling is small compared with the RKKY interaction and in the presence of antiferromagnetic ordering. We show that the Kondo coupling is exactly marginal in the renormalization group sense, establishing the stability of an ordered phase with a small Fermi surface, AFs. Our results have implications for the global phase diagram of the heavy fermion metals, suggesting a Lifshitz transition inside the antiferromagnetic region and providing a new perspective for a Kondo-destroying antiferromagnetic quantum critical point.
description: 4 pages, 4 figures; (v2) corrected typos and added reference/acknowledgment; (v3) version as published in Physical Review Letters (July, 2007)
Tuumanp 'axwé, aatsuupíly songs, evening songs
Creators: name: Allen, Howard
name: Halpern, Abraham M.
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: yum

description: 2 WAV files. Date range represents each side of tape. Side A includes Tuumanp 'axwé and aatsuupíly songs. Side B contains Tuumanp 'axwé and evening songs. For associated notebook, see Margaret Langdon Papers (Bancroft Library), carton 9, folder 43. Digitization by the Berkeley Language Center.
State of the art and perspectives on mass imaging of skins and other vertebrate material
Creators: name: Myriam, Van Walsum
name: Steven, Van Der Mije
name: Wijers Agnes
name: Willemse Luc
Publisher: name: Zenodo
Year: 2019

description: The topic of this report is applications of conventional photography and automated
 imaging for three-dimensional dry collections. No automated imaging solutions were found
 for these types of specimens which is due to variability of material and complexity of
 handling these specimens. Due to the variability of object types, shapes and research
 interest, mass imaging for scientific purposes is not realistic. Imaging labels for data entry
 and databasing purposes should be achievable. We recommend a process based approach
 of record creation with minimal data, combined with label imaging. This can be done very
 rapidly with minimally trained workers. The label images can then be used subsequently,
 during a separate phase, for data entry. Especially when data entry is partial or includes
 interpretation, the images provide potential for future use. It also has to be considered if
 including the specimen in the image adds enough value to justify the extra effort. We also
 provide decision trees to help design a demand based approach.
The generalized Bergshoeff-de Roo identification II
Creators: name: Baron, Walter H.
name: Marques, Diego
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We recently introduced a T-duality covariant mechanism to compute all-order higher-derivative interactions in the heterotic string. Here we extend the formalism to account for a two-parameter family of corrections that also include the bosonic string and HSZ theory. We use our result to compute the full second order Double Field Theory (DFT) for generic values of the parameters, including the generalized Green-Schwarz transformation and its invariant action.
description: 46 pages
Statistical mechanics study of the introduction of a vaccine against COVID-19 disease
Creators: name: De-Leon, Hilla
name: Pederiva, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: By the end of 2020, a year since the first cases of infection by the Covid-19 virus have been reported, there is a light at the end of the tunnel. Several pharmaceutical companies made significant progress in developing effective vaccines against the Covid-19 virus that has claimed the lives of more than a million people over the world. On the other hand, there is growing evidence of re-infection by the virus, which can cause further outbreaks. In this paper, we apply statistical physics tools to examine the vaccination rate required to control the pandemic for three different vaccine efficiency scenarios. Also, we study the effect of temporal restrictions/reliefs on the pandemic's outbreak, assuming that re-infection is possible. When examining the efficiency of the vaccination rate of the general population in preventing an additional outbreak of the disease, we find that a high vaccination rate (where at least 0.3% of the population is vaccinated daily, which is equivalent to ~ 1 million vaccine doses in the United States daily) is required to gain control over the spread of the virus without further restrictions. Due to feasible limitations on the vaccination rate, the vaccination process should be accompanied by the prevailing restrictions until most of the population is vaccinated.
description: 8 pages, 7 figures. arXiv admin note: text overlap with arXiv:2005.10357