cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High magnetoresistance at room temperature in p-i-n graphene nanoribbons due to band-to-band tunneling effects
Creators: name: Liang, Gengchiau
name: kumar, S. Bala
name: Jalil, M. B. A.
name: Tan, S. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A large magnetoresistance effect is obtained at room-temperature by using p-i-n armchair-graphene-nanoribbon (GNR) heterostructures. The key advantage is the virtual elimination of thermal currents due to the presence of band gaps in the contacts. The current at B=0T is greatly decreased while the current at B>0T is relatively large due to the band-to-band tunneling effects, resulting in a high magnetoresistance ratio, even at room-temperature. Moreover, we explore the effects of edge-roughness, length, and width of GNR channels on device performance. An increase in edge-roughness and channel length enhances the magnetoresistance ratio while increased channel width can reduce the operating bias.
description: http://dx.doi.org/10.1063/1.3624459
Incommensurate Magnetic Order in TbTe$_3$
Creators: name: Pfuner, F. S.
name: Gvasaliya, S. N.
name: Zaharko, O.
name: Keller, L.
name: Mesot, J.
name: Pomjakushin, V.
name: Chu, J. -H.
name: Fisher, I. R.
name: Degiorgi, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report a neutron diffraction study of the magnetic phase transitions in the charge-density-wave (CDW) TbTe$_3$ compound. We discover that in the paramagnetic phase there are strong 2D-like magnetic correlations, consistent with the pronounced anisotropy of the chemical structure. A long-range incommensurate magnetic order emerges in TbTe$_3$ at $T_{mag1}$ = 5.78 K as a result of continuous phase transitions. We observe that near the temperature $T_{mag1}$ the magnetic Bragg peaks appear around the position (0,0,0.24) (or its rational multiples), that is fairly close to the propagation vector $(0,0,0.29)$ associated with the CDW phase transition in TbTe$_3$. This suggests that correlations leading to the long-range magnetic order in TbTe$_3$ are linked to the modulations that occur in the CDW state.
Chiral random matrix theory for staggered fermions
Creators: name: Osborn, James C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present a completed random matrix theory for staggered fermions which incorporates all taste symmetry breaking terms at their leading order from the staggered chiral Lagrangian. This is an extension of previous work which only included some of the taste breaking terms. We will also discuss the effects of taste symmetry breaking on the eigenvalues in the weak and strong taste breaking limits, and compare with some results from lattice simulations.
description: 7 pages, 3 figures, The XXIX International Symposium on Lattice Field Theory, July 10-16, 2011, Squaw Valley, Lake Tahoe, California
Bosonization of Supersymmetric KdV equation
Creators: name: Gao, Xiao Nan
name: Lou, S. Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Bosonization approach to the classical supersymmetric systems is presented. By introducing the multi-fermionic parameters in the expansions of the superfields, the $\mathcal {N}=1$ supersymmetric KdV (sKdV) equations are transformed to a system of coupled bosonic equations. The method can be applied to any fermionic systems. By solving the coupled bosonic equations, some novel types of exact solutions can be explicitly obtained. Especially, the richness of the localized excitations of the supersymmetric integrable system are discovered. The rich multi-soliton solutions obtained here have not yet been obtained by using other methods. Unfortunately, the traditional known multi-soliton solutions can also not be obtained by the bosonization approach of this paper. Some open problems on the bosonization of the supersymmetric integrable models are proposed in the both classical and quantum levels.
description: 16 pages, 0 figure
title: A Br-Exit Strategy: Questioning Dualism in the Decision R (Miller) v. The Secretary of State for Exiting the European Union
Creators: name: Romeo, Graziella
name: Mostacci, Edmondo
Publisher: name: European Papers (www.europeanpapers.eu)
Year: 2017
Subjects: subject: dualism
subject: monism
subject: Art. 50 TEU
subject: Brexit
subject: UK constitutional law
subject: EU rights

description: European Papers - A Journal on Law and Integration, 2017 2(1), 425-433
description: European Forum Insight of 9 February 2017
description: I. Form, substance and EU rights. - II. To be or not to be: questioning dualism. - III. The Court and the dualisms of a separation process. - IV. A fourth category of rights? - V. Concluding remarks.
description: The authors offer an alternative reading of the judgment R (Miller) v. The Secretary of State for Exiting the European Union focusing on the dualistic v. monistic dichotomy which permeates the High Court's reasoning. The authors argue that the Court strives for rendering a substantive reading of the relationship between the UK and the EU, while at the same time not ignoring the dualistic frame suggested by the Government's position. The overall result is twofold: the legalistic turn of the withdrawal and the UK still stuck at the crossroad between hard and soft Brexit.
Padé approximants to certain elliptic-type functions
Creators: name: Baratchart, Laurent
name: Yattselev, Maxim
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42C05, 41A20, 41A21

description: Given non-collinear points a_1, a_2, a_3, there is a unique compact, say Δ, that has minimal logarithmic capacity among all continua joining a_1, a_2, and a_3. For h be a complex-valued non-vanishing Dini-continuous function on Δ, we consider f_h(z) := (1/πi)\int_Δh(t)/(t-z) dt/w^+(t), where w(z) := \sqrt{\prod_{k=0}^3(z-a_k)} and w^+ the one-sided value according to some orientation of Δ. In this work we present strong asymptotics of diagonal Padé approximants to f_h and describe the behavior of the spurious pole and the regions of locally uniform convergence from a generic perspective.
description: 41 pages. arXiv admin note: substantial text overlap with arXiv:1103.3556
Creating a running head in APA style
Creators: name: Baer, Richard
Publisher: name: Camosun College
Year: 2011
Subjects: subject: Library & Information Science
subject: Information Literacy
subject: APA citation style
subject: Microsoft Word
subject: word processing
subject: running head

description: Shows how to create a running head to conform with the 6th edition of APA style. (1:40 min.)
Bright single photon emission from a quantum dot in a circular Bragg grating microcavity
Creators: name: Ates, Serkan
name: Sapienza, Luca
name: Davanco, Marcelo
name: Badolato, Antonio
name: Srinivasan, Kartik
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Bright single photon emission from single quantum dots in suspended circular Bragg grating microcavities is demonstrated. This geometry has been designed to achieve efficient (> 50 %) single photon extraction into a near-Gaussian shaped far-field pattern, modest (~10x) Purcell enhancement of the radiative rate, and a spectral bandwidth of a few nanometers. Measurements of fabricated devices show progress towards these goals, with collection efficiencies as high as ~10% demonstrated with moderate spectral bandwidth and rate enhancement. Photon correlation measurements are performed under above-bandgap excitation (pump wavelength = 780 nm to 820 nm) and confirm the single photon character of the collected emission. While the measured sources are all antibunched and dominantly composed of single photons, the multi-photon probability varies significantly. Devices exhibiting tradeoffs between collection efficiency, Purcell enhancement, and multi-photon probability are explored and the results are interpreted with the help of finite-difference time-domain simulations. Below-bandgap excitation resonant with higher states of the quantum dot and/or cavity (pump wavelength = 860 nm to 900 nm) shows a near-complete suppression of multi-photon events and may circumvent some of the aforementioned tradeoffs.
description: 11 pages, 12 figures
Searches for very high energy gamma rays from blazars with CANGAROO-III telescope in 2005-2009
Creators: name: Mizumura, Y.
name: Kushida, J.
name: Nishijima, K.
name: Bicknell, G. V.
name: Clay, R. W.
name: Edwards, P. G.
name: Gunji, S.
name: Hara, S.
name: Hayashi, S.
name: Kabuki, S.
name: Kajino, F.
name: Kawachi, A.
name: Kifune, T.
name: Kiuchi, R.
name: Kodani, K.
name: Matsubara, Y.
name: Mizukami, T.
name: Mizumoto, Y.
name: Mori, M.
name: Muraishi, H.
name: Naito, T.
name: Ohishi, M.
name: Stamatescu, V.
name: Swaby, D. L.
name: Tanimori, T.
name: Thornton, G.
name: Tokanai, F.
name: Toyama, T.
name: Yanagita, S.
name: Yoshida, T.
name: Yoshikoshi, T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We have searched for very high energy (VHE) gamma rays from four blazars using the CANGAROO-III imaging atmospheric Cherenkov telescope. We report the results of the observations of H 2356-309, PKS 2155-304, PKS 0537-441, and 3C 279, performed from 2005 to 2009, applying a new analysis to suppress the effects of the position dependence of Cherenkov images in the field of view. No significant VHE gamma ray emission was detected from any of the four blazars. The GeV gamma-ray spectra of these objects were obtained by analyzing Fermi/LAT archival data. Non-simultaneous wide range (radio to VHE gamma-ray bands) spectral energy distributions (SEDs) including CANGAROO-III upper limits, GeV gamma-ray spectra, and archival data are discussed using a one-zone synchrotron self-Compton (SSC) model in combination with a external Compton (EC) radiation. The HBLs (H 2356-309 and PKS 2155-304) can be explained by a simple SSC model, and PKS 0537-441 and 3C 279 are well modeled by a combination of SSC and EC model. We find a consistency with the blazar sequence in terms of strength of magnetic field and component size.
description: 11 pages, 8 figures, Accepted for publication in Astroparticle Physics
Generative learning strategies do not diminish primary students' attitudes towards augmented reality
Creators: name: Buchner, Josef
Publisher: name: Springer
Year: 2022
Subjects: Erweiterte Realität
Generative Lerntheorie
Wertschöpfungsforschung
Affektive Lernergebnisse
Selbsttest
Selbsterklärend

description: Beeinflussen generative Lernstrategien die motivationalen und affektiven Faktoren des Lernens mit Augmented Reality? Dieser Artikel geht dieser hochaktuellen neuen Fragestellung im Bereich der Bildungstechnologieforschung nach und berichtet über die Ergebnisse einer Wertschöpfungsstudie, die zwei mobile AR-Lernumgebungen mit oder ohne zusätzliche Lernstrategien vergleicht. Insgesamt nahmen 56 Grundschüler teil und lernten mit Augmented Reality (AR) Lernmaterialien entweder in einer Versuchsgruppe oder einer Kontrollgruppe. Die experimentelle Gruppe lernte mit AR und zusätzlichen Lernstrategien, die auf generativer Lerntheorie basieren, nämlich Selbsterklärung und Selbsttestung. Die Kontrollgruppe lernte nur mit AR. Es wurde untersucht, ob die Hinzufügung von Lernstrategien zu einer Verringerung der positiven Einstellungen gegenüber AR als Lerntechnologie führen würde. Die experimentelle Gruppe von Studenten zeigte insgesamt positive Einstellungen gegenüber AR als Lerntechnologie auf etwa dem gleichen Niveau wie die Kontrollgruppe. Es wurden jedoch signifikante Unterschiede für die Skeptizismus-Subskala gefunden, was darauf hindeutet, dass Lernende, die sowohl mit AR als auch mit Lernstrategien gelernt haben, AR als Lerntechnologie skeptischer gegenüberstehen als diejenigen, die nur mit AR gelernt haben. Geschlechtsspezifische Unterschiede wurden auch für die Subskala der Barrierefreiheit gefunden, wobei männliche Teilnehmer die AR-Technologie auch außerhalb des Klassenzimmers als leichter zugänglich betrachteten. Die Auswirkungen dieser Ergebnisse auf Theorie und Praxis sowie weitere Forschungsrichtungen werden diskutiert.
A Generalized Model of Nonlinear Diffusive Shock Acceleration Coupled to an Evolving Supernova Remnant
Creators: name: Lee, Shiu-Hang
name: Ellison, Donald C.
name: Nagataki, Shigehiro
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: To better model the efficient production of cosmic rays (CRs) in supernova remnants (SNRs) with the associated coupling between CR production and SNR dynamics, we have generalized an existing cr-hydro-NEI code (i.e., Ellison et al. 2012) to include the following processes: (1) an explicit calculation of the upstream precursor structure including the position dependent flow speed, density, temperature, and magnetic field strength; (2) a momentum and space dependent CR diffusion coefficient; (3) an explicit calculation of magnetic field amplification (MFA); (4) calculation of the maximum CR momentum using the amplified magnetic field; (5) a finite Alfven speed for the particle scattering centers; and (6) the ability to accelerate a superthermal seed population of CRs as well as the ambient thermal plasma. While a great deal of work has been done modeling SNRs, most work has concentrated on either the continuum emission from relativistic electrons or ions, or the thermal emission from the shock heated plasma. Our generalized code combines these elements and describes the interplay between CR production and SNR evolution, including the nonlinear coupling of efficient diffusive shock acceleration (DSA), based mainly on the work of P. Blasi and co-workers, and a non-equilibrium ionization (NEI) calculation of thermal X-ray line emission. We believe our generalized model will provide a consistent modeling platform for SNRs, including those interacting with molecular clouds, and improve the interpretation of current and future observations, including the high-quality spectra expected from Astro-H. SNR RX J1713.7-3946 is modeled as an example.
description: 13 pages, 5 figures, accepted by the Astrophysical Journal
Blueprint of Shopping Center Parking Space Sketch B, October 12, 1939
Creators: name: Smythe, Richard Haviland
name: Melville, Ward, 1887-1977
name: Organization, Ward Melville Heritage
name: Stony Brook Community Fund
Publisher: name: Unknown
Year: 0
Subjects: Stony Brook
Sketches
Blueprints
Plans
Architects
Shopping centers
Architectural drawings
Stores & shops

description: This blueprint shows the parking space sketch "B" of a shopping center located in Stony Brook, L. I. This plan was completed by architect Richard Haviland Smythe, located at 681 fifth avenue, New York. This blueprint is dated for October 12, 1939.
A unique isolated dwarf spheroidal galaxy at D=1.9 Mpc
Creators: name: Makarov, Dmitry
name: Makarova, Lidia
name: Sharina, Margarita
name: Uklein, Roman
name: Tikhonov, Anton
name: Guhathakurta, Puragra
name: Kirby, Evan
name: Terekhova, Natalya
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a photometric and spectroscopic study of the unique isolated nearby dSph galaxy KKR25. The galaxy was resolved into stars with HST/WFPC2 including old red giant branch and red clump. We have constructed a model of the resolved stellar populations and measured the star formation rate and metallicity as function of time. The main star formation activity period occurred about 12.6 to 13.7 Gyr ago. These stars are mostly metal-poor, with a mean metallicity [Fe/H]\sim -1 to -1.6 dex. About 60 per cent of the total stellar mass was formed during this event. There are indications of intermediate age star formation in KKR25 between 1 and 4 Gyr with no significant signs of metal enrichment for these stars. Long-slit spectroscopy was carried out using the Russian 6-m telescope of the integrated starlight and bright individual objects in the galaxy. We have discovered a planetary nebula (PN) in KKR25. This is the first known PN in a dwarf spheroidal galaxy outside the Local Group. We have measured its oxygen abundance 12+log(O/H)=7.60+-0.07 dex and a radial velocity Vh=-79 km/s. We have analysed the stellar density distribution in the galaxy body. The galaxy has an exponential surface brightness profile with a central light depression. We discuss the evolutionary status of KKR25, which belongs to a rare class of very isolated dwarf galaxies with spheroidal morphology.
description: Accepted to MNRAS. 11 figures, 7 tables
Curvatures of weighted metrics on tangent sphere bundles
Creators: name: Albuquerque, Rui
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A30, 53C17, 53C21

description: We determine the curvature equations of natural metrics on tangent bundles and radius r tangent sphere bundles S_rM of a Riemannian manifold M. A family of positive scalar curvature metrics on S_rM is found, for any M with bounded sectional curvature and any chosen constant r.
title: Global electricity infrastructures
title: Historic developments, associated material stocks, and their relevance for societal wellbeing
titleType: Subtitle
Creators: name: Kalt, Gerald
name: Haas, Willi
name: Thunshirn, Philipp
name: Krausmann, Fridolin
name: Haberl, Helmut
name: Wiedenhofer, Dominik
Publisher: name: Zenodo
Year: 2021
Subjects: history
renewable energy
infrastructure

description: Electricity infrastructures are key for the provision of fundamental energy services and economic prosperity. Profound knowledge on past development and current stocks of electricity infrastructures is of crucial importance, e.g. for assessing the challenges of decarbonizing the power sector or providing universal access to electricity. By combining data from various sources and through modelling of transmission and distribution infrastructures, we present a global inventory of electricity infrastructures and corresponding material stocks. Greenhouse gas emissions associated with stock-building materials are minor in relation to combustion emissions from conventional power plants. Still, increased awareness of these aspects is warranted due to the high material intensities of some renewable energy technologies and the considerable grid expansion needed to accommodate large shares of intermittent energy sources and ensuring reliable electricity supply for a rising world population.
Nonlinear Color-Metallicity Relations of Globular Clusters. II. A Test on the Nonlinearity Scenario for Color Bimodality Using the u-band Colors: The Case of M87 (NGC 4486)
Creators: name: Yoon, Suk-Jin
name: Sohn, Sangmo T.
name: Lee, Sang-Yoon
name: Kim, Hak-Sub
name: Cho, Jaeil
name: Chung, Chul
name: Blakeslee, John P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The optical color distributions of globular clusters (GCs) in most large elliptical galaxies are bimodal. Based on the assumed linear relationship between GC colors and their metallicities, the bimodality has been taken as evidence of two GC subsystems with different metallicities in each galaxy and led to a number of theories in the context of galaxy formation. More recent observations and modeling of GCs, however, suggest that the color-metallicity relations (CMRs) are inflected, and thus colors likely trace metallicities in a nonlinear manner. The nonlinearity could produce bimodal color distributions from a broad underlying metallicity spread, even if it is unimodal. Despite the far-reaching implications, whether CMRs are nonlinear and whether the nonlinearity indeed causes the color bimodality are still open questions. Given that the spectroscopic refinement of CMRs is still very challenging, we here propose a new photometric technique to probe the possible nonlinear nature of CMRs. In essence, a color distribution of GCs is a "projected" distribution of their metallicities. Since the form of CMRs hinges on which color is used, the shape of color distributions varies depending significantly on the colors. Among other optical colors, the u-band related colors (e.g., u - g and u - z) are theoretically predicted to exhibit significantly less inflected CMRs than other preferred CMRs (e.g., for g - z). As a case study, we performed the HST/WFPC2 archival u-band photometry for the M87 (NGC 4486) GC system with confirmed color bimodality. We show that the u-band color distributions are significantly different from that of g - z, and consistent with our model predictions. With more u-band measurements, this method will support or rule out the nonlinear-CMR scenario for the origin of GC color bimodality with high confidence. [Abridged]
description: 34 pages, 6 figures, 6 tables, Accepted for publication in ApJ
Optical spin injection and spin lifetime in Ge heterostructures
Creators: name: Pezzoli, F.
name: Bottegoni, F.
name: Trivedi, D.
name: Ciccacci, F.
name: Giorgioni, A.
name: Li, P.
name: Cecchi, S.
name: Grilli, E.
name: Song, Y.
name: Guzzi, M.
name: Dery, H.
name: Isella, G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate optical orientation in Ge/SiGe quantum wells and study their spin properties. The ultrafast electron transfer from the center of the Brillouin zone to its edge allows us to achieve high spin-polarization efficiencies and to resolve the spin dynamics of holes and electrons. The circular polarization degree of the direct-gap photoluminescence exceeds the theoretical bulk limit, yielding ~37% and ~85% for transitions with heavy and light holes states, respectively. The spin lifetime of holes at the top of the valence band is found to be ~0.5 ps and it is governed by transitions between heavy and light hole states. Electrons at the bottom of the conduction band, on the other hand, have a spin lifetime that exceeds 5 ns below 150 K. Theoretical analysis of the electrons spin relaxation indicates that phonon-induced intervalley scattering dictates the spin lifetime.
description: 5 pages, 3 figures
6-022-CannibalismPredatorPrey-ModelingScenario
Creators: name: Cowden, Evan
name: Hallare, Maila
Publisher: name: QUBES Educational Resources
Year: 2023

description: The Lotka-Volterra model tells us that the prey and predator exhibit a shifted cyclic behavior over time. In this module, we look at modifying this prey-predator model to consider the case when there is cannibalism in the predator species.
Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
Creators: name: Sugai, Shunji
name: Mizuno, Yuki
name: Watanabe, Ryoutarou
name: Kawaguchi, Takahiko
name: Takenaka, Koshi
name: Ikuta, Hiroshi
name: Takayanagi, Yasumasa
name: Hayamizu, Naoki
name: Sone, Yasuhiro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Raman selection rules for electronic and magnetic excitations in BaFe2As2 were theoretically investigated and applied them to the separate detection of the nodal and anti-nodal gap excitations at the spin density wave (SDW) transition and the separate detection of the nearest and the next nearest neighbor exchange interaction energies. The SDW gap has Dirac nodes, because many orbitals participate in the electronic states near the Fermi energy. Using a two-orbital band model the electronic excitations near the Dirac node and the anti-node are found to have different symmetries. Applying the symmetry difference to Raman scattering the nodal and anti-nodal electronic excitations are separately obtained. The low-energy spectra from the anti-nodal region have critical fluctuation just above TSDW and change into the gap structure by the first order transition at TSDW, while those from the nodal region gradually change into the SDW state. The selection rule for two-magnon scattering from the stripe spin structure was obtained. Applying it to the two-magnon Raman spectra it is found that the magnetic exchange interaction energies are not presented by the short-range superexchange model, but the second derivative of the total energy of the stripe spin structure with respect to the moment directions. The selection rule and the peak energy are expressed by the two-magnon scattering process in an insulator, but the large spectral weight above twice the maximum spin wave energy is difficult to explain by the decayed spin wave. It may be explained by the electronic scattering of itinerant carriers with the magnetic self-energy in the localized spin picture or the particle-hole excitation model in the itinerant spin picture. The magnetic scattering spectra are compared to the insulating and metallic cuprate superconductors whose spins are believed to be localized.
description: 38 pages, 11 figures
Remarks on the classification of a pair of commuting semilinear operators
Creators: name: de Oliveira, Debora Duarte
name: Horn, Roger A.
name: Klimchuk, Tatiana
name: Sergeichuk, Vladimir V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 15A04, 15A21

description: Gelfand and Ponomarev [Functional Anal. Appl. 3 (1969) 325-326] proved that the problem of classifying pairs of commuting linear operators contains the problem of classifying k-tuples of linear operators for any k. We prove an analogous statement for semilinear operators.
description: 15 pages
Mean-Field Approximation for Spacing Distribution Functions in Classical Systems
Creators: name: González, Diego Luis
name: Pimpinelli, Alberto
name: Einstein, T. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose a mean-field method to calculate approximately the spacing distribution functions $p^{(n)}(s)$ in 1D classical many-particle systems. We compare our method with two other commonly used methods, the independent interval approximation (IIA) and the extended Wigner surmise (EWS). In our mean-field approach, $p^{(n)}(s)$ is calculated from a set Langevin equations which are decoupled by using a mean-field approximation. We found that in spite of its simplicity, the mean-field approximation provides good results in several systems. We offer many examples in which the three methods mentioned previously give a reasonable description of the statistical behavior of the system. The physical interpretation of each method is also discussed.
Does teacher judgment accuracy matter? How judgment accuracy, teaching quality, and student achievement development are related.
Creators: name: Kolovou, Dimitra
name: Hochweber, Jan
name: Praetorius, Anna-Katharina
Publisher: name: Elsevier
Year: 2024
Subjects: Judgment accuracy
Teacher judgments
Academic achievement
Teaching quality
Multilevel mediation

description: Teacher judgment accuracy is assumed to be positively related to student achievement; however, the empirical evidence for this assumption is inconclusive. Using two accuracy indicators measured at different levels (class/teacher- and student-level), we examined the theoretically hypothesized effects of judgment accuracy on German language achievement over a three-year period, and tested whether teaching quality mediates these effects. We applied multilevel mediation models and small sample methods to data from 35 language teachers and 646 students from 42 classes. While no mediating effects were found, the student-level indicator positively predicted achievement, suggesting that student-level accuracy measures should receive more attention.
Interpolating Masked Weak Lensing Signal with Karhunen-Loeve Analysis
Creators: name: Vanderplas, Jake
name: Connolly, Andrew
name: Jain, Bhuvnesh
name: Jarvis, Mike
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We explore the utility of Karhunen Loeve (KL) analysis in solving practical problems in the analysis of gravitational shear surveys. Shear catalogs from large-field weak lensing surveys will be subject to many systematic limitations, notably incomplete coverage and pixel-level masking due to foreground sources. We develop a method to use two dimensional KL eigenmodes of shear to interpolate noisy shear measurements across masked regions. We explore the results of this method with simulated shear catalogs, using statistics of high-convergence regions in the resulting map. We find that the KL procedure not only minimizes the bias due to masked regions in the field, it also reduces spurious peak counts from shape noise by a factor of ~ 3 in the cosmologically sensitive regime. This indicates that KL reconstructions of masked shear are not only useful for creating robust convergence maps from masked shear catalogs, but also offer promise of improved parameter constraints within studies of shear peak statistics.
description: 13 pages, 9 figures; submitted to ApJ
Ground state factorization of heterogeneous spin models in magnetic fields
Creators: name: Abouie, J.
name: Rezai, M.
name: Langari, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The exact factorized ground state of a heterogeneous (ferrimagnetic) spin model which is composed of two spins ($ρ, σ$) has been presented in detail. The Hamiltonian is not necessarily translational invariant and the exchange couplings can be competing antiferromagnetic and ferromagnetic arbitrarily between different sub-lattices to build many practical models such as dimerized and tetramerized materials and ladder compounds. The condition to get a factorized ground state is investigated for non-frustrated spin models in the presence of a uniform and a staggered magnetic field. According to the lattice model structure we have categorized the spin models in two different classes and obtained their factorization conditions. The first class contains models in which their lattice structures do not provide a single uniform magnetic field to suppress the quantum correlations. Some of these models may have a factorized ground state in the presence of a uniform and a staggered magnetic field. However, in the second class there are several spin models in which their ground state could be factorized whether a staggered field is applied to the system or not. For the latter case, in the absence of a staggered field the factorizing uniform field is unique. However, the degrees of freedom for obtaining the factorization conditions are increased by adding a staggered magnetic field.
description: 16 pages, 6 figures, 1 table, Accepted in Progress of Theoretical Physics
Bridging Portals and Formats: Transforming Metadata from DDI-C 2.5 to OmicsDI in BY-COVID Project
Creators: name: Tuominen, Markus
Publisher: name: Zenodo
Year: 2023

description: One of the primary objectives of the BeYond-COVID project was the integration of social sciences & humanities studies' metadata into the COVID-19 Data Portal. This presentation focuses on the technical work done to achieve this for studies found in CESSDA Data Catalogue (CDC).
Focus of the presentation is the implementation of XML transformation from DDI-Codebook 2.5 to extended OmicsDI format using an XSL template (XSLT). Other parts of the overall process are also covered. XSLT transformations are ran with SaxonC which fully supports XSLT 2.0 and even 3.0, version 2.0 being the one used in this project. Other necessary steps consist of things like harvesting metadata from CDC's OAI-PMH endpoint, filtering and XML validation.
All steps are combined into one fully automated pipeline that creates an XML file with filtered subset of metadata in OmicsDI format for the COVID-19 Data Portal to harvest and use. First version has been in production since September 2022. However, improvements will be made until the end of the project in September 2024.
The presentation also covers the encountered challenges, lessons learned and what can still be improved.
Chiral effect in plane isotropic micropolar elasticity and its application to chiral lattices
Creators: name: Liu, X. N.
name: Huang, G. L.
name: Hu, G. K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In continuum mechanics, the non-centrosymmetric micropolar theory is usually used to capture the chirality inherent in materials. However when reduced to a two dimensional (2D) isotropic problem, the resulting model becomes non-chiral. Therefore, influence of the chiral effect cannot be properly characterized by existing theories for 2D chiral solids. To circumvent this difficulty, based on reinterpretation of isotropic tensors in a 2D case, we propose a continuum theory to model the chiral effect for 2D isotropic chiral solids. A single material parameter related to chirality is introduced to characterize the coupling between the bulk deformation and the internal rotation which is a fundamental feature of 2D chiral solids. Coherently, the proposed continuum theory is also derived for a triangular chiral lattice from a homogenization procedure, from which the effective material constants of the lattice are analytically determined. The unique behavior in the chiral lattice is demonstrated through the analyses of a static tension problem and a plane wave propagation problem. The results, which cannot be predicted by the non-chiral model, are validated by the exact solution of the discrete model.
description: 33 pages, 7 figures
The symplectic-N t-J model and s$_\pm$ superconductors
Creators: name: Flint, Rebecca
name: Coleman, Piers
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The possible discovery of $s_\pm$ superconducting gaps in the moderately correlated iron-based superconductors has raised the question of how to properly treat $s_\pm$ gaps in strongly correlated superconductors. Unlike the d-wave cuprates, the Coulomb repulsion does not vanish by symmetry, and a careful treatment is essential. Thus far, only the weak correlation approaches have included this Coulomb pseudopotential, so here we introduce a symplectic N treatment of the t-J model that incorporates the strong Coulomb repulsion through the complete elimination of on-site pairing. Through a proper extension of time-reversal symmetry to the large N limit, symplectic-N is the first superconducting large N solution of the t-J model. For d-wave superconductors, the previous uncontrolled mean field solutions are reproduced, while for $s_\pm$ superconductors, the SU(2) constraint enforcing single occupancy acts as a pair chemical potential adjusting the location of the gap nodes. This adjustment can capture the wide variety of gaps proposed for the iron based superconductors: line and point nodes, as well as two different, but related full gaps on different Fermi surfaces.
description: 8 pages, 3 figures
Hodge theory and unitary representations of reductive Lie groups
Creators: name: Schmid, Wilfried
name: Vilonen, Kari
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 22E46, 22D10, 58A14 (Primary) 32C38 (Secondary)

description: We present an application of Hodge theory towards the study of irreducible unitary representations of reductive Lie groups. We describe a conjecture about such representations and discuss some progress towards its proof.
The Influence of Error Learning Orientation on Intrinsic Motivation for Visual Programming in STEM Education
Creators: name: Schmid, Rahel
name: Robin, Nicolas
name: Smit, Robbert
name: Strahl, Alexander
Publisher: name: Lectito Journals
Year: 2022
Subjects: errors
coding lessons
intrinsic motivation
mediation
secondary education

description: Secondary school students often lack the necessary motivation to program visually. The present study aims to analyse the effects of error learning orientation on students' intrinsic motivation for visual programming. According to the control-value theory of Pekrun (2006), we posit that the influence of error learning orientation on intrinsic motivation is mediated by self-efficacy for visual programming as well as by error-related achievement emotions. A sample of 269 Swiss secondary school students (grades 7 to 9), who were beginners in visual programming, filled out a questionnaire as part of a course on visual programming. A structural equation model was established to illustrate the expected relationships between students' attitudes and their impacts. As expected, the results point to the need of paying more attention to errors in STEM education and indicate that students' error learning orientation had a low but significant effect on their intrinsic motivation for visual programming. The findings confirmed the effects of error learning orientation on intrinsic motivation for visual programming, which are mediated by self-efficacy but not by error related achievement emotions in the context of coding activities.
Εφαρμογές της βιώσιμης διαχείρισης υδατικών πόρων στην αγροτική ανάπτυξη
Creators: name: Παπατζίκα Παναγιώτα-Εφραιμία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Διαχείριση υδατικών πόρων
Βιώσιμη ανάπτυξη
Αγροτικός τομέας
Water Resources Management
Sustainable Development
Agricultural Sector

description: Η βιώσιμη διαχείριση των υδατικών πόρων στον γεωργικό τομέα συνίσταται στην εξισορρόπηση της διαθεσιμότητας νερού και της χρήσης του νερού στην απαραίτητη ποσότητα και ποιότητα για τις αγροτικές καλλιέργειες με περιορισμένο περιβαλλοντικό αποτύπωμα και χαμηλό κόστος. Η εφαρμογή της δεν είναι απλή, καθώς απαιτείται η εισαγωγή των νέων τεχνολογιών, ενώ προσκρούει σε οικονομικούς περιορισμούς, σε νομικά και θεσμικά πλαίσια, σε υφιστάμενες γεωργικές πρακτικές και στην κοινωνική συμπεριφορά των αγροτικών κοινοτήτων. Στο πλαίσιο της διαχείρισης του νερού δίνεται έμφαση τόσο στον σχεδιασμό της άρδευσης όσο και στις αρδευτικές μεθόδους με βάση κριτήρια όπως το στάδιο ανάπτυξης των φυτών, η ευαισθησία στην πίεση του νερού, οι κλιματικές συνθήκες και η διαθεσιμότητα του νερού. Σκοπός της παρούσας εργασίας είναι η ανάδειξη της σημασίας της βιώσιμης διαχείρισης των υδατικών πόρων για τη γεωργική ανάπτυξη, στο πλαίσιο και της νέας ΚΑΠ 2021-2027 με την οποία η Ε.Ε. στοχεύει στη μετάβαση στην πράσινη γεωργία θέτοντας ως προτεραιότητα την εξοικονόμηση και αειφορία των φυσικών πόρων και συγκεκριμένα του νερού, την ασφάλεια και την επάρκεια των τροφίμων, την ενίσχυση των μικρών και μεσαίων καλλιεργειών και τη μείωση του αντίκτυπου της γεωργίας
description: Sustainable water management in the agricultural sector consists of balancing water availability and water use in the necessary quantity and quality for agricultural crops with a limited environmental footprint and low cost. Its implementation is not simple, as it requires the introduction of new technologies, while it comes up against financial limitations, legal and institutional frameworks, existing agricultural practices and the social behavior of rural communities. In the context of water management, emphasis is placed on both irrigation planning and irrigation methods based on criteria such as plant growth stage, sensitivity to water stress, climatic conditions and water availability. The objective of this project is to highlight the importance of sustainable water resources management for agricultural development, in the context of the new CAP 2021-2027 through which the E.U. aims to the transition to green agriculture by prioritizing food security and sufficiency, to sustainability of natural resources and especially water resources, strengthening small and medium crops and reducing the environmental impact of agriculture
Stadtgrün im Spannungsfeld zur Nachverdichtung von Städten
Creators: name: Hartz, Andrea
name: Saad, Sascha
Publisher: name: Zenodo
Year: 2023
Subjects: DFNS 2023

description: Das REFOPLAN-Projekt „Stadtgrün und kommunale Nachhaltigkeit: Klimaanpassung, doppelte Innenentwicklung und Flächensicherung“ des Umweltbundesamtes zielt darauf ab, die Funktionen und Ökosystemdienstleistungen der Freiräume auch vor dem Hintergrund des starken Entwicklungsdrucks in urbanen Räumen planerisch besser zu sichern. In einer auf Nachhaltigkeit und resiliente Raumstrukturen ausgerichteten Stadtentwicklung spielen Freiraumschutz und Freiraumqualifizierung eine wachsende Rolle. Über eine grün-blaue Infrastruktur können großräumige funktionale Freiraumverbünde gesichert oder geschaffen, Risikovorsorge betrieben, Stadtquartiere gezielt aufgewertet und miteinander vernetzt, untergenutzte Flächen reintegriert, neue, kollektive oder temporäre Nutzungen ermöglicht werden. Vor diesem Hintergrund führt der Entwicklungsdruck in Städten zu einem ausgeprägten Spannungsfeld zwischen der notwendigen baulichen Nachverdichtung und dem über die neue Leipzig-Charta vermittelten Ziel, „grüne Städte“ der Zukunft zu schaffen. Auch die im Rahmen des Projektes durchgeführte Online-Befragung ergab, dass sich viele Kommunen mehr Hilfestellung bei der planerischen und politischen Bewältigung dieser Herausforderungen wünschen. Ein zentraler Baustein im Rahmen des REFOPLAN-Projekts widmet sich diesem Thema – auf Basis einer bundesweiten Literaturrecherche, einer indikatorengestützten Analyse und 10 Fallstudien in ausgewählten Städten. Die Ergebnisse der indikatorengestützten Analyse werden mit diesem Beitrag vorgestellt. Aufgrund der Datenverfügbarkeit wurden nur Städte mit mindestens 50.000 Einwohner:innen betrachtet. Es wurden Indikatoren sowohl für die Grünausstattung als auch zur Abbildung des Entwicklungsdrucks genutzt, um einen Überblick über Kommunen mit einem hohen Entwicklungsdruck und unterschiedlicher Grünausstattung zu gewinnen. Für die Grünausstattung wurden Indikatoren herangezogen, die über den IÖR-Monitor verfügbar sind: beispielsweise die Grünflächenausstattung pro Einwohner:in (m²/EW) sowie der Grünanteil in Siedlungs- und Verkehrsfläche (%). Für den Entwicklungsdruck wurden Indikatoren des UBA und des BBSR verwendet, die teilweise für das Forschungsprojekt auf Gemeindeebene neu berechnet wurden: beispielsweise der Komplexindikator „wachsende und schrumpfende Städte“ (BBSR 2015 – 2020), die Wohnflächenentwicklung für den Zeitraum 2011 bis 2019 oder ein Szenario zur Siedlungsentwicklung 2045 des UBA. Die Ausprägung dieser Indikatoren trägt dazu bei, das Spannungsfeld zu beleuchten und die Fallstudienstädte auszuwählen.
Διερεύνηση της επίδρασης της ικανοποίησης και κόπωσης συμπόνιας στην ψυχική ανθεκτικότητα των επαγγελματιών κοινωνικών λειτουργών στην Ελλάδα
Creators: name: Τουλγερίδου, Ευανθία Μελετίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Κόπωση Συμπόνιας
Ικανοποίηση Συμπόνιας
Ψυχική Ανθεκτικότητα
Compassion Fatigue
Compassion Satisfaction
Psychological Resilience

description: Σκοπός της παρούσας μελέτης είναι η διερεύνηση της επίδρασης της ικανοποίησης και κόπωσης συμπόνιας στην ψυχική ανθεκτικότητα των επαγγελματιών κοινωνικών λειτουργών στην Ελλάδα. Παράλληλα, επιμέρους στόχοι αποτελούν α) ο προσδιορισμός και η κατανόηση των διαστάσεων της επαγγελματικής ποιότητας ζωής των κοινωνικών λειτουργών, β) η διερεύνηση πιθανής επίδρασης της κόπωσης συμπόνιας σε επαγγελματίες που εργάζονται με άτομα που έχουν βιώσει ψυχοτραυματικά γεγονότα και γ) ο ρόλος της ψυχικής ανθεκτικότητας στην καθημερινή πρακτική των κοινωνικών λειτουργών
description: The purpose of this study is to investigate the effect of satisfaction and compassion fatigue on the psychological resilience of professional social workers in Greece. At the same time, individual objectives are a) the identification and understanding of the dimensions of the professional quality of life of social workers, b) the investigation of possible impact of compassion fatigue on professionals working with people who have experienced traumatic events and c) the role of resilience in the daily practice of social workers
Carving Out the Space of 4D CFTs
Creators: name: Poland, David
name: Simmons-Duffin, David
name: Vichi, Alessandro
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce a new numerical algorithm based on semidefinite programming to efficiently compute bounds on operator dimensions, central charges, and OPE coefficients in 4D conformal and N=1 superconformal field theories. Using our algorithm, we dramatically improve previous bounds on a number of CFT quantities, particularly for theories with global symmetries. In the case of SO(4) or SU(2) symmetry, our bounds severely constrain models of conformal technicolor. In N=1 superconformal theories, we place strong bounds on dim(Phi*Phi), where Phi is a chiral operator. These bounds asymptote to the line dim(Phi*Phi) <= 2 dim(Phi) near dim(Phi) ~ 1, forbidding positive anomalous dimensions in this region. We also place novel upper and lower bounds on OPE coefficients of protected operators in the Phi x Phi OPE. Finally, we find examples of lower bounds on central charges and flavor current two-point functions that scale with the size of global symmetry representations. In the case of N=1 theories with an SU(N) flavor symmetry, our bounds on current two-point functions lie within an O(1) factor of the values realized in supersymmetric QCD in the conformal window.
description: 60 pages, 22 figures