cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The effects of agent heterogeneity in environmental preferences on social welfare estimates derived by the contingent valuation method
Creators: name: Rudd, Murray
Publisher: name: University of British Columbia
Year: 2009

description: Human society is facing a variety of broad and unique environmental challenges as we enter the twenty-first century. The economic consequences of environmental changes, such as biodiversity loss, depletion of the ozone layer and global climate change, could have very serious impacts on human societies and economies around the globe. Because environmental goods and services are not traded in established markets, economists have developed the contingent valuation method (CVM) as a tool to place economic values on public environmental goods. These values can then be used to compare the relative economic advantages and costs of development projects using cost-benefit analyses or for environmental litigation purposes. One technical issue of particular interest is related to the effects of agent heterogeneity on the accuracy of the social welfare benefits derived using CVM. This study uses an artificial market approach to examine whether valid estimates of aggregate social welfare are obtained using CVM when artificial agent preferences are heterogeneous with regards to environmental goods and whether there are systematic biases away from true welfare as measured by compensating surplus. I found that estimated values of willingness to pay for three levels of environmental change were significantly less than true willingness to pay for the artificial agents. In addition, an analysis of residual errors showed that the use of the log-linear utility function in the empirical utility difference CVM model provided significantly improved, albeit inaccurate, estimates of true willingness to pay compared to the use of the linear utility function. This study has shown that welfare measures estimated suing CVM are unreliable when there is agent heterogeneity, as is the case in the real world, even under simple conditions when agent preferences are specified in accordance with economic theory and there are no technical complications relating to survey design and delivery.
Comparison of inclusive particle production in 14.6 GeV/c proton-nucleus collisions with simulation
Creators: name: Jaffe, D. E.
name: Lo, K. H.
name: Comfort, J. R.
name: Sivertz, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Inclusive charged pion, kaon, proton, and deuteron production in 14.6 GeV/c proton-nucleus collisions measured by BNL experiment E802 is compared with results from the GEANT3, GEANT4, and FLUKA simulation packages. The FLUKA package is found to have the best overall agreement.
description: 16 pages, 11 figures; improved clarity of figures
Citizen Science: Harnessing the Power of the People in the Era of Big Data
Creators: name: Bickle, Thomas P.
Publisher: name: Zenodo
Year: 2024

description: As we enter an era where data is abundant, large imaging surveys (e.g. DESI’s Legacy Surveys, WISE) and catalogs containing billions of sources (e.g. Gaia, CatWISE2020) offer an unprecented opportunity for new discoveries in the quest for volume completeness. However, ensuring that we are fully utilizing these large datasets can be a challenge. I discuss, with a particular emphasis on the Backyard Worlds: Planet 9 project, how citizen science can be an antidote to the challenges of big data, giving scientists access to millions of science enthusiasts who can apply both manpower and their unique skills to the task. I show how they are effective at outlier detection, finding objects within the local volume outside our typical search criteria, and I present some original research, performed as a citizen scientist, that seeks to expand the census of objects in local young moving groups, the completeness of which directly informs our understanding of the initial mass function.
title: The Trend Unemployment Rate in Canada: Searching for the Unobservable
Creators: name: Brouillette, Dany
name: Robitaille, Marie-Noëlle
name: Savoie-Chabot, Laurence
name: St-Amant, Pierre
name: Gueye, Bassirou
name: Nelson, Elise
Publisher: name: Bank of Canada
Year: 2019

description: In this paper, we assess several methods that have been used to measure the Canadian trend unemployment rate (TUR). We also consider improvements and extensions to some existing methods.

description: Dans cette étude, nous analysons diverses méthodes ayant servi à mesurer le taux de chômage tendanciel au Canada. Nous prenons également en considération quelques améliorations et variantes de certaines méthodes existantes.
Functor of Points and Height Functions for Noncommutative Arakelov Geometry
Creators: name: Lima, Alicia
name: Marcolli, Matilde
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 58B34, 16D20, 11M55, 11G50, 14G40

description: We propose a notion of functor of points for noncommutative spaces, valued in categories of bimodules, and endowed with an action functional determined by a notion of hermitian structures and height functions, modeled on an interpretation of the classical functor of points as a physical sigma model. We discuss different choices of such height functions, based on different notions of volumes and traces, including one based on the Hattori-Stallings rank. We show that the height function determines a dynamical time evolution on an algebra of observables associated to our functor of points. We focus in particular the case of noncommutative arithmetic curves, where the relevant algebras are sums of matrix algebras over division algebras over number fields, and we discuss a more general notion of noncommutative arithmetic spaces in higher dimensions, where our approach suggests an interpretation of the Jones index as a height function.
description: 43 pages, LaTeX
Estimate of neutrino masses from Koide's relation
Creators: name: Li, Nan
name: Ma, Bo-Qiang
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Mathematical Physics (math-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We apply Koide's mass relation of charged leptons to neutrinos and quarks, with both the normal and inverted mass schemes of neutrinos discussed. We introduce the parameters $k_ν$, $k_u$ and $k_d$ to describe the deviations of neutrinos and quarks from Koide's relation, and suggest a quark-lepton complementarity of masses such as $ k_{l}+k_{d} \approx k_ν+k_{u} \approx 2$. The masses of neutrinos are determined from the improved relation, and they are strongly hierarchical (with the different orders of magnitude of $10^{-5} eV$, $10^{-3} eV$, and $10^{-2} eV$).
description: 12 latex pages, 4 figures, version in publication
title: Local Labor Markets in Canada and the United States
Creators: name: Albouy, David
name: Chernoff, Alex
name: Lutz, Chandler
name: Warman, Casey
Publisher: name: Bank of Canada
Year: 2019

description: We examine local labor markets in the United States and Canada from 1990 to 2011 using comparable household and business data. Wage levels and inequality rise with city population in both countries, albeit less in Canada.

description: Nous examinons les marchés locaux du travail aux États-Unis et au Canada sur la période de 1990 à 2011 en utilisant des données comparables relatives aux ménages et aux entreprises. Dans les deux pays, les salaires et les inégalités augmentent avec la taille de la population urbaine, mais l’augmentation est moins prononcée au Canada.
title: Do Survey Expectations of Stock Returns Reflect Risk Adjustments?
Creators: name: Adam, Klaus
name: Matveev, Dmitry
name: Nagel, Stefan
Publisher: name: Bank of Canada
Year: 2019

description: Motivated by the observation that survey expectations of stock returns are inconsistent with rational return expectations under real-world probabilities, we investigate whether alternative expectations hypotheses entertained in the literature on asset pricing are consistent with the survey evidence.

description: Constatant que les données d’enquête sur les rendements attendus des actions ne correspondent pas aux anticipations rationnelles fondées sur des probabilités réelles, nous examinons si elles pourraient concorder avec d’autres hypothèses soulevées dans la littérature sur les anticipations relatives à l’évaluation des actifs.
N=1 RG Flows, Product Groups, and a-Maximization
Creators: name: Barnes, Edwin
name: Intriligator, Ken
name: Wecht, Brian
name: Wright, Jason
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore new IR phenomena and dualities, arising for product groups, in the context of N=1 supersymmetric gauge theories. The RG running of the multiple couplings can radically affect each other. For example, an otherwise IR interacting coupling can be driven to be instead IR free by an arbitrarily small, but non-zero, initial value of another coupling. Or an otherwise IR free coupling can be driven to be instead IR interacting by an arbitrarily small non-zero initial value of another coupling. We explore these and other phenomena in N=1 examples, where exact results can be obtained using a-maximization. We also explore the various possible dual gauge theories, e.g. by dualizing one gauge group with the other treated as a weakly gauged flavor symmetry, along with previously proposed duals for the theories deformed by A_k-type Landau-Ginzburg superpotentials. We note that this latter duality, and all similar duality examples, always have non-empty superconformal windows, within which both the electric and dual A_k superpotentials are relevant.
description: 36 pages, 8 figures
title: Limiting Sender’s Information in Bayesian Persuasion
Creators: name: Ichihashi, Shota
Publisher: name: Bank of Canada
Year: 2019

description: This paper studies how the outcome of Bayesian persuasion depends on a sender’s information. I study a game in which, prior to the sender’s information disclosure, the designer can restrict the most informative signal that the sender can generate.

description: Dans cette étude, j’examine comment le résultat de la persuasion dans un jeu bayésien dépend de l’information dont dispose un expéditeur. Pour ce faire, je considère un jeu dans lequel, avant que l’expéditeur ne transmette la moindre information, le concepteur est autorisé à limiter le contenu du signal le plus porteur d’information que l’expéditeur peut générer.
An Ultracool History of Complete Volume-Limited Samples in the Solar Neighborhood
Creators: name: Best, William M J
Publisher: name: Zenodo
Year: 2024

description: Complete volume-limited samples are the gold standard for population studies, essential for constraining demographics of the solar neighborhood and models of its members. I will review the history of volume-limited samples in solar-neighborhood ultracool dwarf studies, discuss challenges for obtaining complete samples, present issues that have arisen from incomplete samples, and highlight discoveries enabled only by complete volume-limited samples. I will conclude with a look to the future, pointing out factors that future ultracool volume-limited studies will need to address in the era of expanded samples from LSST.
IGR J17252-3616: an accreting pulsar observed by INTEGRAL and XMM-Newton
Creators: name: Heras, J. A. Zurita
name: De Cesare, G.
name: Walter, R.
name: Bodaghee, A.
name: Belanger, G.
name: Courvoisier, T.
name: Shaw, S. E.
name: Stephen, J. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The discovery of the X-ray source IGR J17252-3616 by INTEGRAL was reported on 9 February 2004. Regular monitoring by INTEGRAL shows that IGR J17252-3616 is a persistent hard X-ray source with an average count rate of 0.96 counts/s (~6.4 mCrab) in the 20-60 keV energy band. A follow-up observation with XMM-Newton, which was performed on 21 March 21 2004, showed that the source is located at R.A.(2000.0)=17h25m11.4 and Dec.=-36degr16'58.6" with an uncertainty of 4". The only infra-red counterpart to be found within the XMM-Newton error circle was 2MASS J17251139-3616575, which has a Ks-band magnitude of 10.7 and is located 1" away from the XMM-Newton position. The analysis of the combined INTEGRAL and XMM-Newton observations shows that the source is a binary X-ray pulsar with a spin period of 413.7 s and an orbital period of 9.72 days. The spectrum can be fitted with a flat power law plus an energy cut off (Gamma~0.02,Ecut~8.2 keV) or a Comptonized model (kTe~5.5 keV, tau~7.8). The spectrum also indicates a large hydrogen column density of Nh~15x1e22 atoms/cm-2 suggesting an intrinsic absorption. The Fe Kalpha line at 6.4 keV is clearly detected. Phase-resolved spectroscopy does not show any variation in the continuum except the total emitted flux. The absorption is constant along the pulse phase. This source can be associated with EXO 1722-363 as both systems show common timing and spectral features. The observations suggest that the source is a wind-fed accreting pulsar accompanied by a supergiant star.
description: 11 pages, 13 figures, accepted for publication in Astronomy and Astrophysics
title: Rezension: Annette Vowinckel, Agenten der Bilder. Fotografisches Handeln im 20. Jahrhundert, Göttingen, Wallstein Verlag 2016
Creators: name: Brink, Cornelia
Publisher: name: ZZF - Centre for Contemporary History: Visual History
Year: 2017

description: Fotohistorikerinnen und -historiker – deren Perspektive auch diese Rezension folgt – machen seit vielen Jahren darauf aufmerksam, dass die Geschichtsschreibung des 19. und vor allem des 20. Jahrhunderts Bildquellen in die historische Analyse einbeziehen muss. Wie Fotografien politik-, sozial- und kulturgeschichtliche Prozesse in der Vergangenheit mit gestaltet haben, kann man seit den 1980er-Jahren in den Fachzeitschriften „Fotogeschichte“ und dem „Rundbrief Fotografie“, in unzähligen Monografien und Tagungsdokumentationen, seit einigen Jahren auch in geschichtswissenschaftlichen Zeitschriften wie den „Zeithistorischen Forschungen“ und nicht zuletzt an dieser Stelle nachlesen. Nun legt Annette Vowinckel eine fotohistorische Studie vor, die ausdrücklich nicht von den Fotos ausgeht, sondern „von den Handlungen, deren Ziel und Inhalt die Produktion und Zirkulation von Bildern ist“ (S. 15).
Espacios para mujeres activistas indígenas en Guatemala
Creators: name: Roslynn Beighton
Publisher: name: figshare
Year: 2021
Subjects: subject: 220104 Human Rights and Justice Issues
subject: FOS: Philosophy, ethics and religion
subject: 160403 Social and Cultural Geography
subject: FOS: Social and economic geography
subject: 160807 Sociological Methodology and Research Methods
subject: FOS: Sociology
subject: 169999 Studies in Human Society not elsewhere classified
subject: 160499 Human Geography not elsewhere classified
subject: 160803 Race and Ethnic Relations

description: Esta tesis se basa en los hallazgos de una colección de entrevistas realizadas a profundidad en Guatemala durante un mes de trabajo en campo con mujeres indígenas que trabajan en organizaciones comunitarias de base, basado en los derechos humanos. Se utiliza un lente interseccional para enmarcar de forma analítica las narrativas de estas activistas. Esta tesis examina la estructura y las redes de apoyo de los espacios actuales para el activismo, analiza los obstáculos que encuentran estas mujeres y la inspiración detrás de sus motivaciones para el activismo, incluida la influencia del ‘pensamiento feminista’, los modelos comunitarios y la cosmovisión maya. Por último, propone recomendaciones a nivel local, nacional e internacional, para apoyar activistas indígenas en Guatemala y mundialmente.
Equivalence of a Complex $\cP\cT$-Symmetric Quartic Hamiltonian and a Hermitian Quartic Hamiltonian with an Anomaly
Creators: name: Bender, Carl M.
name: Brody, Dorje C.
name: Chen, Jun-Hua
name: Jones, Hugh F.
name: Milton, Kimball A.
name: Ogilvie, Michael C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a recent paper Jones and Mateo used operator techniques to show that the non-Hermitian $\cP\cT$-symmetric wrong-sign quartic Hamiltonian $H=\half p^2-gx^4$ has the same spectrum as the conventional Hermitian Hamiltonian $\tilde H=\half p^2+4g x^4-\sqrt{2g} x$. Here, this equivalence is demonstrated very simply by means of differential-equation techniques and, more importantly, by means of functional-integration techniques. It is shown that the linear term in the Hermitian Hamiltonian is anomalous; that is, this linear term has no classical analog. The anomaly arises because of the broken parity symmetry of the original non-Hermitian $\cP\cT$-symmetric Hamiltonian. This anomaly in the Hermitian form of a $\cP\cT$-symmetric quartic Hamiltonian is unchanged if a harmonic term is introduced into $H$. When there is a harmonic term, an immediate physical consequence of the anomaly is the appearance of bound states; if there were no anomaly term, there would be no bound states. Possible extensions of this work to $-ϕ^4$ quantum field theory in higher-dimensional space-time are discussed.
description: 19 pages, 7 figures, corrected references
Gravitational waves in Brans-Dicke Theory with a cosmological constant
Creators: name: Özer, Hatice
name: Delice, Özgür
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Weak field gravitational wave solutions are investigated in Brans-Dicke (BD) theory in the presence of a cosmological constant. In this setting the background geometry is not flat but asymptotically de-Sitter. We investigate the linearised field equations, and their gravitational wave solutions in a certain gauge choice. We will show that this theory leads to massless scalar waves as in original BD theory and in contrast to massive BD theory. The effects of these waves on free particles and their polarization properties are studied extensively and effects of the cosmological constant is analyzed in these phenomena in detail. The energy flux of these waves are also discussed in this background. By analyzing this flux, we obtain a critical distance where the waves cannot propagate further, which extends Cosmic no Hair Conjecture (CNC) to BD theory with a cosmological constant.
description: V2: 30 pages, Revtex 4-1, References are added, discussion is extended, section III-D is added, Published version
Magnetic White Dwarfs from the SDSS II. The Second and Third Data Releases
Creators: name: Vanlandingham, Karen M.
name: Schmidt, Gary D.
name: Eisenstein, Daniel J.
name: Harris, Hugh C.
name: Anderson, Scott F.
name: Hall, Pat B.
name: Liebert, James
name: Schneider, Donald P.
name: Silvestri, Nicole M.
name: Stinson, Gregory S.
name: Wolfe, Michael A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Fifty-two magnetic white dwarfs have been identified in spectroscopic observations from the Sloan Digital Sky Survey (SDSS) obtained between mid-2002 and the end of 2004, including Data Releases 2 and 3. Though not as numerous nor as diverse as the discoveries from the first Data Release, the collection exhibits polar field strengths ranging from 1.5MG to ~1000MG, and includes two new unusual atomic DQA examples, a molecular DQ, and five stars that show hydrogen in fields above 500MG. The highest-field example, SDSSJ2346+3853, may be the most strongly magnetic white dwarf yet discovered. Analysis of the photometric data indicates that the magnetic sample spans the same temperature range as for nonmagnetic white dwarfs from the SDSS, and support is found for previous claims that magnetic white dwarfs tend to have larger masses than their nonmagnetic counterparts. A glaring exception to this trend is the apparently low-gravity object SDSSJ0933+1022, which may have a history involving a close binary companion.
description: 20 pages, 4 figures Accepted for publication in the Astronomical Journal
Gaia-based Isochronal, Kinematic, and Spatial Analysis of the $ε$ Cha Association
Creators: name: Dickson-Vandervelde, D. Annie
name: Wilson, Emily C.
name: Kastner, Joel H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The precise parallax, proper motion, and photometric measurements contained in Gaia Data Release 2 (DR2) offer the opportunity to re-examine the membership and ages of Nearby Young Moving Groups (NYMGs), i.e., loose groups of stars of age $\lesssim100$ Myr in the solar vicinity. Here, we analyze the available DR2 data for members and candidate members of the $ε$ Cha Association ($ε$CA) which, at an estimated age of $\sim$3--5 Myr, has previously been identified as among the youngest NYMGs. The several dozen confirmed members of $ε$CA include MP Mus and T Cha, two of the nearest stars of roughly solar mass that are known to host primordial protoplanetary disks, and the Herbig Ae/Be star HD 104237A. We have used Gaia DR2 data to ascertain the Galactic positions and kinematics and color-magnitude diagram positions of $ε$CA members and candidates, so as to reassess their membership status and thereby refine estimates of the distance, age, multiplicity, and disk fraction of the group. Our analysis yields 36 \textit{bona fide} $ε$CA members, as well as 20 provisional members, including 3 new members identified here as comoving companions to previously known $ε$CA stars. We determine a mean distance to $ε$CA of 101.0$\pm$4.6 pc and confirm that, at an age of $5^{+3}_{-2}$ Myr, $ε$CA represents the youngest stellar group within $\sim$100 pc of Earth. We identify several new photometric binary candidates, bringing the overall multiplicity fraction (MF) of $ε$CA to 40\%, intermediate between the MFs of young T associations and the field.
description: 26 pages, 9 figures, to be published in AJ, replacement with updated minor revisions
A Rescue Demonstrator for Interdependent Aspects of Reliability, Security and Quality Towards a Complete EDA Flow
Creators: name: George, Nevin
name: Medeiros, Guilherme Cardoso
name: Junchao Chen
name: Conda, Josie Esteban Rodriguez
name: Lange, Thomas
name: Damljanovic, Aleksa
name: Ferreira, Raphael Segabinazzi
name: Balakrishnan, Aneesh
name: Xinhui (Anna) Lai
name: Shayesteh Masoumian
name: Petryk, Dmytro
name: Troya Cagil Koylu
name: Silva, Felipe Augusto Da
name: Bagbaba, Ahmet Cagri
name: Gürsoy, Cemil Cem
name: Hamdioui, Said
name: Mottaqiallah Taouil
name: Milos Krstic
name: Langendoerfer, Peter
name: Dyka, Zoya
name: Brandalero, Marcelo
name: Hübner, Michael
name: Nolte, Jörg
name: Vierhaus, Heinrich Theodor
name: Reord, Matteo Sonza
name: Squillero, Giovanni
name: Sterpone, Luca
name: Raik, Jaan
name: Alexandrescu, Dan
name: Glorieux, Maximilien
name: Selimis, Georgios
name: Geert-Jan Schrijen
name: Klotz, Anton
name: Sauer, Christian
name: Jenihhin, Maksim
Publisher: name: Zenodo
Year: 2020
Subjects: Reliability
Security
Quality
Fault-Tolerance
EDA tools
nanoeletronic systems design

description: The demonstrator highlights the various interdependent aspects of Reliability, Security and Quality in nanoelectronics system design within an EDA toolset and a processor architecture setup. The compelling need of attention towards these three aspects of nanoelectonic systems have been ever more pronounced over extreme miniaturization of technologies. Further, such systems have exploded in numbers with IoT devices, heavy and analogous interaction with the external physical world, complex safety-critical applications, and Artificial intelligence applications. RESCUE targets such aspects in the form, Reliability (functional safety, ageing, soft errors), Security (tamper-resistance, PUF technology, intelligent security) and Quality (novel fault models, functional test, FMEA/FMECA, verification/debug) spanning the entire hardware software system stack. The demonstrator is brought together by a group of PhD students under the banner of H2020-MSCA-ITN RESCUE EU project. They are part of a larger interdisciplinary cross-sectoral team from Tallinn UT, TU Delft, BTU Cottbus, POLITO, IHP, IROC, Intrinsic-ID, Cadence and Bosch who collaborate on a holistic solution for modelling, assessment and enhancement of these extra functional design aspects.
Is Asymptotically Weyl-Invariant Gravity Viable?
Creators: name: Coumbe, Daniel
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore the cosmological viability of a theory of gravity defined by the Lagrangian $f(\mathcal{R})=\mathcal{R}^{n\left(\mathcal{R}\right)}$ in the Palatini formalism, where $n\left(\mathcal{R}\right)$ is a dimensionless function of the Palatini scalar curvature $\mathcal{R}$ that interpolates between general relativity when $n\left(\mathcal{R}\right)=1$ and a locally scale-invariant and superficially renormalizable theory when $n\left(\mathcal{R}\right)=2$. We refer to this model as asymptotically Weyl-invariant gravity (AWIG). We analyse perhaps the simplest possible implementation of AWIG. A phase space analysis yields three fixed points with effective equation of states corresponding to de Sitter, radiation and matter-dominated phases. An analysis of the deceleration parameter suggests our model is consistent with an early and late period of accelerated cosmic expansion, with an intermediate period of decelerated expansion. We show that the model contains no obvious curvature singularities. Therefore, AWIG appears to be cosmologically viable, at least for the simple implementation explored.
description: 14 pages, 6 figures, 3 tables. References added. Conforms with version published in PRD
Deliverable 4.4 Report on imaging and spectroscopy of graphene nanoribbon edges ESR10
Creators: name: Shetty, Naveen
Publisher: name: Zenodo
Year: 2021

description: Graphene nanoribbons (GNRs) grown epitaxially on silicon carbide (SiC) substrates have the potential to become key building blocks for future nanoelectronic devices. The self-aligned growth of these ribbons on the silicon terminated face of SiC allows the controlled termination of the ribbons either to be zigzag (ZZ) or armchair (AC) in nature (Fig.1(a)). The electronic properties of these ribbons are determined by the type of edge termination. The AC ribbons, depending upon how wide they are, behave like a semiconductor or metal, on the other hand ZZ ribbons are always metallic1. The group lead by Walt A. de Heer has shown that the neutral ribbons behave ballistic over a length scale of 16 μm2. These findings give a good motivation to image and study the edges of GNRs by microscopic and spectroscopic techniques. Here in this work, the GNRs were grown epitaxially over SIC and their growth conditions are imaged using low energy electron microscopy (LEEM), peak force microsopy (PFM) and lateral force microscopy (LFM) techniques. The presence of ribbons are confirmed by probing their chemical and electronic properities by Raman spectroscopy and angle resolved photoemission spectroscopy (ARPES). To perform the quantum transport measurements, a low resistive edge contact fabrication technique was developed, using which we can achieve contact resistance as low as (50 Ω ± 25) Ωμm. This value is in near agreement with the quantum limit to the contact resistance Ωμm3. Attempts were made to image the edges of grown ribbon and to measure local density of states using scanning tunneling microscopy and spectroscopy. Due to the complex manure of the tip navigation along XY plane of the instrument, only 4 sidewalls are probed out of 20000 potential ribbon sites. This prevented us from getting enough statistical data to determine the presence or absence of ribbons on the chip. Hence, this measurement did not achieve its respective goal as stated, although other spectroscopic and imaging techniques has confirmed the presence of graphene nanoribbons in our samples.
Transport in anisotropic model systems analyzed by a correlated projection superoperator technique
Creators: name: Weimer, Hendrik
name: Michel, Mathias
name: Gemmer, Jochen
name: Mahler, Günter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: By using a correlated projection operator, the time-convolutionless (TCL) method to derive a quantum master equation can be utilized to investigate the transport behavior of quantum systems as well. Here, we analyze a three-dimensional anisotropic quantum model system according to this technique. The system consists of Heisenberg coupled two-level systems in one direction and weak random interactions in all other ones. Depending on the partition chosen, we obtain ballistic behavior along the chains and normal transport in the perpendicular direction. These results are perfectly confirmed by the numerical solution of the full time-dependent Schrödinger equation.
description: 8 pages, 6 figures
The dynamic magnetosphere of Swift J1818.0$-$1607
Creators: name: Lower, Marcus E.
name: Johnston, Simon
name: Shannon, Ryan M.
name: Bailes, Matthew
name: Camilo, Fernando
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Radio-loud magnetars display a wide variety of radio-pulse phenomenology seldom seen among the population of rotation-powered pulsars. Spectropolarimetry of the radio pulses from these objects has the potential to place constraints on their magnetic topology and unveil clues about the magnetar radio emission mechanism. Here we report on eight observations of the magnetar Swift J1818.0$-$1607 taken with the Parkes Ultra-Wideband Low receiver covering a wide frequency range from 0.7 to 4 GHz over a period of 5 months. The magnetar exhibits significant temporal profile evolution over this period, including the emergence of a new profile component with an inverted spectrum, two distinct types of radio emission mode switching, detected during two separate observations, and the appearance and disappearance of multiple polarization modes. These various phenomena are likely a result of ongoing reconfiguration of the plasma content and electric currents within the magnetosphere. Geometric fits to the linearly polarized position angle indicate we are viewing the magnetar at an angle of $\sim$99$^{\circ}$ from the spin axis, and its magnetic and rotation axes are misaligned by $\sim$112$^{\circ}$. While conducting these fits, we found the position angle swing had reversed direction on MJD 59062 compared to observations taken 15 days earlier and 12 days later. We speculate this phenomena may be evidence the radio emission from this magnetar originates from magnetic field lines associated with two co-located magnetic poles that are connected by a coronal loop.
description: 13 pages, 10 figures, 4 tables. Accepted to MNRAS
Contrasting Supersymmetry and Universal Extra Dimensions at the CLIC Multi-TeV e+e- Collider
Creators: name: Battaglia, Marco
name: Datta, AseshKrishna
name: De Roeck, Albert
name: Kong, Kyoungchul
name: Matchev, Konstantin T.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Universal extra dimensions and supersymmetry have rather similar experimental signatures at hadron colliders. The proper interpretation of an LHC discovery in either case may therefore require further data from a lepton collider. In this paper we identify methods for discriminating between the two scenarios at the linear collider. We study the processes of Kaluza-Klein muon pair production in universal extra dimensions in parallel to smuon pair production in supersymmetry, accounting for the effects of detector resolution, beam-beam interactions and accelerator induced backgrounds. We find that the angular distributions of the final state muons, the energy spectrum of the radiative return photon and the total cross-section measurement are powerful discriminators between the two models. Accurate determination of the particle masses can be obtained both by a study of the momentum spectrum of the final state leptons and by a scan of the particle pair production thresholds. We also calculate the production rates of various Kaluza-Klein particles and discuss the associated signatures.
description: 20 pages, 13 figures, typeset in JHEP style, uses axodraw. Added new section 5. Version to appear in JHEP
Influence of contrasting land-use types on organic C accumulation in a sandy loam soil
Creators: name: Bhanudacha Kamolmanit
name: Siwaporn Paengkam
Publisher: name: Faculty of Agriculture
Year: 2019
Subjects: soil microbial biomass, soil respiration, land-use types, functional redundancy

description: Khon Kaen Agriculture Journal, 47, 5, 1037-1044
Crystalline temperate distributions with uniformly discrete support and spectrum
Creators: name: Lev, Nir
name: Reti, Gilad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 30D15, 42A38, 52C23

description: We prove that a temperate distribution on $\mathbb{R}$ whose support and spectrum are uniformly discrete sets, can be obtained from Poisson's summation formula by a finite number of basic operations (shifts, modulations, differentiations, multiplication by polynomials, and taking linear combinations).
Ice: a strongly correlated proton system
Creators: name: Neto, A. H. Castro
name: Pujol, P.
name: Fradkin, Eduardo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We discuss the problem of proton motion in Hydrogen bond materials with special focus on ice. We show that phenomenological models proposed in the past for the study of ice can be recast in terms of microscopic models in close relationship to the ones used to study the physics of Mott-Hubbard insulators. We discuss the physics of the paramagnetic phase of ice at 1/4 filling (neutral ice) and its mapping to a transverse field Ising model and also to a gauge theory in two and three dimensions. We show that H3O+ and HO- ions can be either in a confined or deconfined phase. We obtain the phase diagram of the problem as a function of temperature T and proton hopping energy t and find that there are two phases: an ordered insulating phase which results from an order-by-disorder mechanism induced by quantum fluctuations, and a disordered incoherent metallic phase (or plasma). We also discuss the problem of decoherence in the proton motion introduced by the lattice vibrations (phonons) and its effect on the phase diagram. Finally, we suggest that the transition from ice-Ih to ice-XI observed experimentally in doped ice is the confining-deconfining transition of our phase diagram.
description: 12 pages, 9 figures
Metallicities and ages for 35 star clusters and their surrounding fields in the Small Magellanic Cloud
Creators: name: Narloch, W.
name: Pietrzyński, G.
name: Gieren, W.
name: Piatti, A. E.
name: Górski, M.
name: Karczmarek, P.
name: Graczyk, D.
name: Suchomska, K.
name: Zgirski, B.
name: Wielgórski, P.
name: Pilecki, B.
name: Taormina, M.
name: Kałuszyński, M.
name: Pych, W.
name: Hajdu, G.
name: García, G. Rojas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this work we study 35 stellar clusters in the Small Magellanic Cloud (SMC) in order to provide their mean metallicities and ages. We also provide mean metallicities of the fields surrounding the clusters. We used Strömgren photometry obtained with the 4.1 m SOAR telescope and take advantage of $(b - y)$ and $m1$ colors for which there is a metallicity calibration presented in the literature. The spatial metallicity and age distributions of clusters across the SMC are investigated using the results obtained by Strömgren photometry. We confirm earlier observations that younger, more metal-rich star clusters are concentrated in the central regions of the galaxy, while older, more metal-poor clusters are located farther from the SMC center. We construct the age-metallicity relation for the studied clusters and find good agreement with theoretical models of chemical enrichment, and with other literature age and metallicity values for those clusters. We also provide the mean metallicities for old and young populations of the field stars surrounding the clusters, and find the latter to be in good agreement with recent studies of the SMC Cepheid population. Finally, the Strömgren photometry obtained for this study is made publicly available.
description: 22 pages, 12 figures, 6 tables, Published in A&A
E-book Ambiente de simulação BestPrice: gestão na prática (versão SM)
Creators: name: Oliveira, Murilo Alvarenga
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Simulation software
subject: Business and management
subject: business game
subject: Active learning

description: Manual do usuário com regras e dinâmica do Ambiente de simulação BestPrice Game, um jogo de empresas para educação gerencial em cursos acadêmicos e treinamentos corporativos.
Teleportation for atomic entangled state by entanglement swapping with separate measurements in cavity QED
Creators: name: Xue, Zheng-Yuan
name: Yang, Ming
name: Yi, You-Ming
name: Cao, Zhuo-Liang
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Experimentally feasible scheme for teleportation of atomic entangled state via entanglement swapping is proposed in cavity quantum electrodynamics (QED) without joint Bell-state measurement (BSM). In the teleportation processes the interaction between atoms and a single-mode nonresonant cavity with the assistance of a strong classical driving field substitute the joint measurements. The discussion of the scheme indicates that it can be realized by current technologies.
description: 5 pages, no figure
Signature of a possible $α$-cluster state in $N=Z$ doubly-magic $^{56}$Ni
Creators: name: Bagchi, S.
name: Akimune, H.
name: Gibelin, J.
name: Harakeh, M. N.
name: Kalantar-Nayestanaki, N.
name: Achouri, N. L.
name: Bastin, B.
name: Boretzky, K.
name: Bouzomita, H.
name: Caamaño, M.
name: Càceres, L.
name: Damoy, S.
name: Delaunay, F.
name: Fernández-Domínguez, B.
name: Fujiwara, M.
name: Garg, U.
name: Grinyer, G. F.
name: Kamalou, O.
name: Khan, E.
name: Krasznahorkay, A.
name: Lhoutellier, G.
name: Libin, J. F.
name: Lukyanov, S.
name: Mazurek, K.
name: Najafi, M. A.
name: Pancin, J.
name: Penionzkhevich, Y.
name: Perrot, L.
name: Raabe, R.
name: Rigollet, C.
name: Roger, T.
name: Sambi, S.
name: Savajols, H.
name: Senoville, M.
name: Stodel, C.
name: Suen, L.
name: Thomas, J. C.
name: Vandebrouck, M.
name: Van de Walle, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: An inelastic $α$-scattering experiment on the unstable $N=Z$, doubly-magic $^{56}$Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for $α$-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay model. The ideal classical gas model at $kT$ = 0.4 MeV reproduces fairly well the experimental momentum distribution and the observed multiplicity of $α$ particles corresponds to an excitation energy around 96 MeV. The method of distributed $mα$-decay ensembles is in agreement with the experimental results if we assume that the $α$-gas state in $^{56}$Ni exists at around $113^{+15}_{-17}$ MeV. These results suggest that there may exist an exotic state consisting of many $α$ particles at the excitation energy of $113^{+15}_{-17}$ MeV.
description: Accepted for publication in the European Physical Journal A
B Meson Decays to mega K*, omega rho, omega omega, omega phi, and omega f0
Creators: name: The BABAR Collaboration
name: Aubert, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We describe searches for B meson decays to the charmless vector-vector final states omega K*, omega rho, omega omega, and omega phi with 233 times 10^{6} BB pairs produced in e+e- annihilation at sqrt{s}=10.58 GeV. We also search for the vector-scalar B decay to omega f_0. We measure the following branching fractions in units of 10^{-6}: BR(B0 --> omega K*0) = 2.4 +/- 1.1 +/- 0.7 (<4.2), BR(B+ --> omega K*+) = 0.6 {+1.4}_{-1.2} {+1.1}_{-0.9} (<3.4), BR(B0 --> omega rho0) = -0.6 +/- 0.7 {+0.8}_{-0.3} (<1.5), BR(B+ --> omega rho+) = 10.6 +/- 2.1 {+1.6}_{-1.0}, BR(B0 --> omega omega) = 1.8 {+1.3}_{-0.9} +/- 0.4 (<4.0), BR(B0 --> omega phi) = 0.1 +/- 0.5 +/- 0.1 (<1.2), and BR(B0 --> omega f_0) = 0.9 +/- 0.4 {+0.2}_{-0.1} (<1.5). In each case the first error quoted is statistical, the second systematic, and the upper limits are defined at the 90% confidence level. For B+ --> omega rho+ decays we also measure the longitudinal spin component f_L=0.82 +/- 0.11 +/- 0.02 and the charge asymmetry A_CP=0.04 +/- 0.18 +/- 0.02.
description: 8 pages, 3 postscript figues, submitted to Phys. Rev. D (Rapid Communications)
Unconventional Oil and Gas Development and Agricultural Land-use in the U.S.
Creators: name: Xu, Yuelu
name: Elbakidze, Levan
name: Etienne, Xiaoli
name: Xu, Yuelu
name: Elbakidze, Levan
name: Etienne, Xiaoli
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agricultural and Food Policy
subject: Land Economics/Use
subject: Resource /Energy Economics and Policy
subject: Unconventional oil and gas
subject: Energy
subject: Agriculture
subject: Crop acreage

description: The rapid development of unconventional oil and gas (UOG) has raised public concerns about its land use and competition with agriculture. Using county-level data from 1997 to 2018, we find that on average, UOG development negatively affected crop acreage in the contiguous U.S. However, there exists significant regional heterogeneity. The relationship is positive in Southwestern region, U-shaped in Great Plains, and negative in Appalachia. There is significant difference in crop acreage between counties with and without UOG after 2008 in the contiguous U.S. and Great Plains. The reduction in crop acreage after 2008 was highest in Great Plains.
Is the nexus between capital structure and firm performance asymmetric? An emerging market perspective
Creators: name: N., Nikhil M.
name: Shenoy, Sandeep S.
name: Chakraborty, Suman
name: M., Lithin B.
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Environmental Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: The nature of the relationship between leverage and firm performance has been a subject of investigation in extant literature. We re-examine the nature of the association by using a sample of 78 non-financial firms listed in the Nifty 100 index during the 2013-2023 period by applying the quantile regression technique and comparing the result with the linear regression approach (system GMM technique). Our empirical analysis demonstrates that leverage negatively impacts the performance of firms. Further, results show that the association is non-homogeneous among firms of different quantiles: leverage withers the performance of highly profitable firms (upper quantile) than low profitable firms (lower quantile). The identified concave relationship highlights the prominence of optimal capital structure and the role of finance managers in designing a sound financial policy that matches firm characteristics and borrowing requirements. The findings of our study draw insightful implications for managers and policymakers while contributing to the ongoing leverage and firm performance debate reported in previous studies. Since the pioneering work of Modigliani and Miller, the debate on the relationship between Capital Structure (CS) and Firm Performance (FP) has been a subject of discussion. Consequently, the CS and FP linkage has garnered the attention of several academic scholars. However, the majority of the empirical studies have demonstrated a linear link between CS and FP, whereas the studies on the nonlinear relationship are scant in the existing scholarly studies. Thus, to provide more insights, we used quantile regression techniques, and our results corroborate that the CS and FP relationship is non-homogeneous among Indian firms. To succinctly put, the magnitude of the negative impact of leverage is found to be more around highly profitable firms. Our regression result highlights the importance of maintaining the right capital mix and suggests that large firms should refrain from excessive borrowing. Further, we contend that policymakers must strengthen corporate governance mechanisms and restrict the earnings management activities of the management. Overall, our robust findings enhance the existing body of knowledge while drawing significant implications for management, policymakers, and other stakeholders.
Generalized Euler-Lotka equation for correlated cell divisions
Creators: name: Pigolotti, Simone
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Cell division times in microbial populations display significant fluctuations, that impact the population growth rate in a non-trivial way. If fluctuations are uncorrelated among different cells, the population growth rate is predicted by the Euler-Lotka equation, which is a classic result in mathematical biology. However, cell division times can be significantly correlated, due to physical properties of cells that are passed through generations. In this paper, we derive an equation remarkably similar to the Euler-Lotka equation which is valid in the presence of correlations. Our exact result is based on large deviation theory and does not require particularly strong assumptions on the underlying dynamics. We apply our theory to a phenomenological model of bacterial cell division in E.coli and to experimental data. We find that the discrepancy between the growth rate predicted by the Euler-Lotka equation and our generalized version is relatively small, but large enough to be measurable by our approach.
description: 6 pages, 5 figures, combined Main Text + SI. Accepted as a Letter in Physical Review E
Scholarly Communication in the Open Science Framework: Engaging with OA publishers
Creators: name: Dumouchel, Suzanne
Publisher: name: Zenodo
Year: 2022

description: The talk will present the Action Plan for Diamond Open Access, developed by Science Europe, cOAlition S, OPERAS, and the French National Research Agency (ANR). The goal of the Action Plan is to further develop and expand a sustainable, community-driven Diamond OA scholarly communication ecosystem. The Action Plan proposes to align and develop common resources for the entire Diamond OA ecosystem, including journals and platforms, while respecting the cultural, multilingual, and disciplinary diversity that constitutes the strength of the sector. It focuses on four central elements: efficiency, quality standards, capacity building, and sustainability, following up on the recommendations of the ‘Open Access Diamond Journals Study’.