cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
An Intermediate-age Alpha-rich Galactic Population in K2
Creators: name: Warfield, Jack T.
name: Zinn, Joel C.
name: Pinsonneault, Marc H.
name: Johnson, Jennifer A.
name: Stello, Dennis
name: Elsworth, Yvonne
name: García, Rafael A.
name: Kallinger, Thomas
name: Mathur, Savita
name: Mosser, Benoît
name: Beaton, Rachael L.
name: García-Hernández, D. A.
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: We explore the relationships between the chemistry, ages, and locations of stars in the Galaxy using asteroseismic data from the K2 mission and spectroscopic data from the Apache Point Galactic Evolution Experiment survey. Previous studies have used giant stars in the Kepler field to map the relationship between the chemical composition and the ages of stars at the solar circle. Consistent with prior work, we find that stars with high [Alpha/Fe] have distinct, older ages in comparison to stars with low [Alpha/Fe]. We provide age estimates for red giant branch (RGB) stars in the Kepler field, which support and build upon previous age estimates by taking into account the effect of alpha-enrichment on opacity. Including this effect for [Alpha/Fe]-rich stars results in up to 10% older ages for low-mass stars relative to corrected solar mixture calculations. This is a significant effect that Galactic archaeology studies should take into account. Looking beyond the Kepler field, we estimate ages for 735 red giant branch stars from the K2 mission, mapping age trends as a function of the line of sight. We find that the age distributions for low- and high-[Alpha/Fe] stars converge with increasing distance from the Galactic plane, in agreement with suggestions from earlier work. We find that K2 stars with high [Alpha/Fe] appear to be younger than their counterparts in the Kepler field, overlapping more significantly with a similarly aged low-[Alpha/Fe] population. This observation may suggest that star formation or radial migration proceeds unevenly in the Galaxy.
description: Published in AJ
The History and Future of the Local and Loop I Bubbles
Creators: name: Breitschwerdt, Dieter
name: de Avillez, Miguel A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Local and Loop I superbubbles are the closest and best investigated supernova (SN) generated bubbles and serve as test laboratories for observations and theories of the interstellar medium. Since the morphology and dynamical evolution of bubbles depend on the ambient density and pressure distributions, a realistic modelling of the galactic environment is crucial for a detailed comparison with observations. We have performed 3D high resolution (down to 1.25 pc on a kpc-scale grid) hydrodynamic simulations of the Local Bubble (LB) and the neighbouring Loop I (L1) superbubble in a realistically evolving inhomogeneous background ISM, disturbed already by SN explosions at the Galactic rate for 200 Myr before the LB and L1 are generated. The LB is the result of 19 SNe occurring in a moving group, which passed through the present day local HI cavity. We can reproduce (i) the OVI column density in absorption within the LB in agreement with COPERNICUS and recent FUSE observations, giving N(OVI) <2 10^{13} cm^-2 and N(OVI)<7 10^{12} cm^-2, respectively, (ii) the observed sizes of the Local and Loop I superbubbles, (iii) the interaction shell between LB and L1, discovered with ROSAT, (iv) constrain the age of the LB to be 14.5+0.7/-0.4 Myr, (v) predict the merging of the two bubbles in about 3 Myr, when the interaction shell starts to fragment, (vi) the generation of blobs like the Local Cloud as a consequence of a dynamical instability. We find that evolving superbubbles strongly deviate from idealised self-similar solutions due to ambient pressure and density gradients, as well as due to turbulent mixing and mass loading. Hence, at later times the hot interior can break through the surrounding shell, which may also help to explain the puzzling energy "deficit" observed in LMC bubbles.
description: Accepted for publication in Astronomy and Astrophysics Letters. The paper contains 5 pages and 11 figures. Fig. 1a replaced by correct figure
International Technology Transfer in Agriculture
Creators: name: Anderson, Margot
name: Anderson, Margot
Publisher: name: Unknown
Year: 1989
Subjects: Agricultural and Food Policy
International Development
International Relations/Trade
Research and Development/Tech Change/Emerging Technologies

description: Private firms are becoming more important in agricultural technology transfer, which occurs when a country acquires, imitates, or adapts technologies that were developed in another country. New crop varieties, farm chemicals, and farm operating systems are some of the advances spread through technology transfer. This report discusses the implications of and reasons for the private sector's expanding role in agricultural technology transfer, a field that once was dominated by public sector institutions such as governments, international organizations, and universities.
A 3D radiative transfer framework: II. line transfer problems
Creators: name: Baron, E.
name: Hauschildt, Peter H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Higher resolution telescopes as well as 3D numerical simulations will require the development of detailed 3D radiative transfer calculations. Building upon our previous work we extend our method to include both continuum and line transfer. We present a general method to calculate radiative transfer including scattering in the continuum as well as in lines in 3D static atmospheres. The scattering problem for line transfer is solved via means of an operator splitting (OS) technique. The formal solution is based on a long-characteristics method. The approximate $Λ$ operator is constructed considering nearest neighbors {\em exactly}. The code is parallelized over both wavelength and solid angle using the MPI library. We present the results of several test cases with different values of the thermalization parameter and two choices for the temperature structure. The results are directly compared to 1D spherical tests. With our current grid setup the interior resolution is much lower in 3D than in 1D, nevertheless the 3D results agree very well with the well-tested 1D calculations. We show that with relatively simple parallelization that the code scales to very large number of processors which is mandatory for practical applications. Advances in modern computers will make realistic 3D radiative transfer calculations possible in the near future. Our current code scales to very large numbers of processors, but requires larger memory per processor at high spatial resolution.
description: A&A, in press, 9 pages, 9 Figures. Full resolution version available at ftp://phoenix.hs.uni-hamburg.de/preprints/3DRT_paper2.pdf
Cross-Code verification and sensitivity analysis to effectively model the electrothermal instability
Creators: name: Masti, R. L.
name: Ellison, C. L.
name: King, J. R.
name: Stoltz, P. H.
name: Srinivasan, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: I.6.0
subject: 76W05

description: This manuscript presents verification cases that are developed to study the electrothermal instability (ETI). Specific verification cases are included to ensure that the unit physics components necessary to model the ETI are accurate, providing a path for fluid-based codes to effectively simulate ETI in the linear and nonlinear growth regimes. Two software frameworks with different algorithmic approaches are compared for accuracy in their ability to simulate diffusion of a magnetic field, linear growth of the ETI, and a fully nonlinear ETI evolution. The nonlinear ETI simulations show early time agreement, with some differences emerging, as noted in the wavenumber spectrum, late into the nonlinear development of ETI. A sensitivity study explores the role of equation-of-state (EOS), vacuum density, and vacuum resistivity. EOS and vacuum resistivity are found to be the most critical factors in the modeling of nonlinear ETI development.
description: 14 pages, 14 figures, To be published in the journal of High Energy Density Physics
A study of charge accumulation and spacer flashover in compressed gas insulation
Creators: name: Zhou, Jianping
Publisher: name: University of British Columbia
Year: 2011

description: Compressed gas insulated substation (GIS) and transmission line (GITL) equipment have been developed rapidly throughout the world during the past decades. Compactness is the main advantage of GIS and GITL over conventional air-insulated substations and transmission lines. Sulphur hexafluoride (SF₆) is used as an insulation gas in GIS and GITL because of its excellent insulating properties. Supporting spacers are identified as the most likely places for flashover to occur and they often determine the overall strength of a system. For energized system, surface charges have been observed on spacer surfaces and are considered to play an important role for anomalous flashover of a GIS or GITL system. The purpose of this research is to study the mechanisms and factors governing the magnitude and distribution of surface charges and their influence on flashover voltage. In this investigation, experiments to study surface charge accumulation under different experimental conditions have been conducted, with a rod-spacer-plane electrode system. The parameters varied are applied voltage levels, insulating gases, gas pressures, spacer materials, rod electrode diameters, and the duration of applied voltages. Experiments with impulse voltage pre-charging were also conducted. It was found that the mechanisms of surface charging are corona, gas conduction, and photoionization. Surface charge magnitude and distribution are strongly field dependent and are related to the duration of voltage application. Spacers in SF₆ gas accumulate less charges on the surface than in air and nitrogen , for a given geometry, spacer material, voltage, and gas pressure. In order to determine the effect of surface charges on overall electric field, a surface charge simulation program (the SSM program) was developed to calculate the overall electric field when there are surface charges on a spacer surface. The calculation results show that surface charges significantly distort the overall electric field magnitude, field direction, and distributions, which may explain the anomalous flashover in GIS/GITL systems. It was found that the flashover propagation field on a PTFE spacer surface may be between 6 kV/cm and 10 kV/cm. High speed photographic observations, with an image intensifier, are suggested to examine the propagation of a flashover. It may, therefore, be possible that, a reasonable model to predict flashover in SF₆ gas can be built by comparing the flashover propagation model with the electric field pattern on a spacer surface. The role of photoionization near the spacer surface in charge accumulation should also be studied in greater detail.
Optical approximation in the theory of geometric impedance
Creators: name: Stupakov, G.
name: Bane, K. L. F.
name: Zagorodnov, I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: In this paper we introduce an optical approximation into the theory of impedance calculation, one valid in the limit of high frequencies. This approximation neglects diffraction effects in the radiation process, and is conceptually equivalent to the approximation of geometric optics in electromagnetic theory. Using this approximation, we derive equations for the longitudinal impedance for arbitrary offsets, with respect to a reference orbit, of source and test particles. With the help of the Panofsky-Wenzel theorem we also obtain expressions for the transverse impedance (also for arbitrary offsets). We further simplify these expressions for the case of the small offsets that are typical for practical applications. Our final expressions for the impedance, in the general case, involve two dimensional integrals over various cross-sections of the transition. We further demonstrate, for several known axisymmetric examples, how our method is applied to the calculation of impedances. Finally, we discuss the accuracy of the optical approximation and its relation to the diffraction regime in the theory of impedance.
description: 10 pages, 5 figures
Evidence of high-temperature exciton condensation in 2D atomic double layers
Creators: name: Wang, Zefang
name: Rhodes, Daniel A.
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Hone, James C.
name: Shan, Jie
name: Mak, Kin Fai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: A Bose-Einstein condensate is the ground state of a dilute gas of bosons, such as atoms cooled to temperatures close to absolute zero. With much smaller mass, excitons (bound electron-hole pairs) are expected to condense at significantly higher temperatures. Here we study electrically generated interlayer excitons in MoSe2/WSe2 atomic double layers with density up to 10^12 cm-2. The interlayer tunneling current depends only on exciton density, indicative of correlated electron-hole pair tunneling. Strong electroluminescence (EL) arises when a hole tunnels from WSe2 to recombine with electron in MoSe2. We observe a critical threshold dependence of the EL intensity on exciton density, accompanied by a super-Poissonian photon statistics near threshold, and a large EL enhancement peaked narrowly at equal electron-hole densities. The phenomenon persists above 100 K, which is consistent with the predicted critical condensation temperature. Our study provides compelling evidence for interlayer exciton condensation in two-dimensional atomic double layers and opens up exciting opportunities for exploring condensate-based optoelectronics and exciton-mediated high-temperature superconductivity.
Carbon-Enhanced Metal-Poor Stars. Osmium and Iridium Abundances in the Neutron-Capture-Enhanced Subgiants CS31062-050 and LP625-44
Creators: name: Aoki, Wako
name: Bisterzo, Sara
name: Gallino, Roberto
name: Beers, Timothy C.
name: Norris, John E.
name: Ryan, Sean G.
name: Tsangarides, Stelios
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have investigated the abundances of heavy neutron-capture elements, including osmium (Os) and iridium (Ir), in the two Carbon-Enhanced Metal-Poor (CEMP) subgiants CS31062-050 and LP625-44. CS31062-050 is known to be a so-called CEMP-r/s star, which exhibits large excesses of s-process elements such as barium (Ba) and lead (Pb), as well as a significant enhancement of europium (Eu) that cannot be explained by conventional s-process production in Asymptotic Giant Branch star models. Our analysis of the high-resolution spectrum for this object has determined, for the first time, the abundances of Ir and Os, elements in the third peak of the r-process nucleosynthesis. They also exhibit significant excesses relative to the predictions of standard s-process calculations. These two elements are not detected in a similar-quality spectrum of LP625-44; the derived upper limits on their abundances are lower than the abundances in CS31062-050. We compare the observed abundance patterns of neutron-capture elements, including Os and Ir, in these two stars with recent model calculations of the s-process, and discuss possible interpretations.
description: 12 pages, 2 figures, 1 table, ApJ Letter, in press
Lorentz-Violating Massive Gravity in Curved Space
Creators: name: Grisa, Luca
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In models of modified gravity, extra degrees of freedom usually appear. They must be removed from the spectrum because they may indicate the presence of instabilities and because otherwise the model might not agree with observation. In the present letter, we will discuss a model that modifies General Relativity through the addition of a Lorentz-violating potential-like term for the metric. No additional propagating modes and no classical instabilities are present. The model departs from GR only in the extreme infrared region, and the cosmological evolution contains a bounce when the size of the Universe is of the same order of the added deformation.
description: 23 pages, 9 figures; corrected typos and added references; JHEP version, corrected one mistake, few typos and added references
Deep Hedging of Derivatives Using Reinforcement Learning
Creators: name: Cao, Jay
name: Chen, Jacky
name: Hull, John
name: Poulos, Zissis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Finance (q-fin.CP)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Machine Learning (cs.LG)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: This paper shows how reinforcement learning can be used to derive optimal hedging strategies for derivatives when there are transaction costs. The paper illustrates the approach by showing the difference between using delta hedging and optimal hedging for a short position in a call option when the objective is to minimize a function equal to the mean hedging cost plus a constant times the standard deviation of the hedging cost. Two situations are considered. In the first, the asset price follows a geometric Brownian motion. In the second, the asset price follows a stochastic volatility process. The paper extends the basic reinforcement learning approach in a number of ways. First, it uses two different Q-functions so that both the expected value of the cost and the expected value of the square of the cost are tracked for different state/action combinations. This approach increases the range of objective functions that can be used. Second, it uses a learning algorithm that allows for continuous state and action space. Third, it compares the accounting P&L approach (where the hedged position is valued at each step) and the cash flow approach (where cash inflows and outflows are used). We find that a hybrid approach involving the use of an accounting P&L approach that incorporates a relatively simple valuation model works well. The valuation model does not have to correspond to the process assumed for the underlying asset price.
description: 21 pages, 3 figures, 4 tables
Latency-Aware Multi-antenna SWIPT System with Battery-Constrained Receivers
Creators: name: Kumar, Dileep
name: López, Onel L. Alcaraz
name: Joshi, Satya Krishna
name: Tölli, Antti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Power splitting (PS) based simultaneous wireless information and power transfer (SWIPT) is considered in a multi-user multiple-input-single-output broadcast scenario. Specifically, we focus on jointly configuring the transmit beamforming vectors and receive PS ratios to minimize the total transmit energy of the base station under the user-specific latency and energy harvesting (EH) requirements. The battery depletion phenomenon is avoided by preemptively incorporating information regarding the receivers' battery state and EH fluctuations into the resource allocation design. The resulting time-average sum-power minimization problem is temporally correlated, non-convex (including mutually coupled latency-battery queue dynamics), and in general intractable. We use the Lyapunov optimization framework and derive a dynamic control algorithm to transform the original problem into a sequence of deterministic and independent subproblems, which are then solved via two alternative approaches: i) semidefinite relaxation combined with fractional programming, and ii) successive convex approximation. Furthermore, we design a low-complexity closed-form iterative algorithm exploiting the Karush-Kuhn-Tucker optimality conditions for a specific scenario with delay bounded batteryless receivers. Numerical results provide insights on the robustness of the proposed design to realize an energy-efficient SWIPT system while ensuring latency and EH requirements in a time dynamic mobile access network.
description: 34 pages, 12 figures
Large and Almost Maximal Neutrino Mixing within the Type II See-Saw Mechanism
Creators: name: Lindner, Manfred
name: Rodejohann, Werner
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Within the type II see-saw mechanism the light neutrino mass matrix is given by a sum of a direct (or triplet) mass term and the conventional (type I) see-saw term. Both versions of the see-saw mechanism explain naturally small neutrino masses, but the type II scenario offers interesting additional possibilities to explain large or almost maximal or vanishing mixings which are discussed in this paper. We first introduce ``type II enhancement'' of neutrino mixing, where moderate cancellations between the two terms can lead to large neutrino mixing even if all individual mass matrices and terms generate small mixing. However, nearly maximal or vanishing mixings are not naturally explained in this way, unless there is a certain initial structure (symmetry) which enforces certain elements of the matrices to be identical or related in a special way. We therefore assume that the leading structure of the neutrino mass matrix is the triplet term and corresponds to zero U_{e3} and maximal theta_{23}. Small but necessary corrections are generated by the conventional see-saw term. Then we assume that one of the two terms corresponds to an extreme mixing scenario, such as bimaximal or tri-bimaximal mixing. Deviations from this scheme are introduced by the second term. One can mimic Quark-Lepton Complementarity in this way. Finally, we note that the neutrino mass matrix for tri-bimaximal mixing can be -- depending on the mass hierarchy -- written as a sum of two terms with simple structure. Their origin could be the two terms of type II see-saw.
description: 25 pages. Comments and references added, to appear in JHEP
Criminalization of the mentally ill : a study of psychiatric services within the Lower Mainland Regional Correctional Centre, Health Care Centre
Creators: name: Chow, Lily Lucia
Publisher: name: University of British Columbia
Year: 2010

description: This paper examines the plight of the incarcerated mentally ill. After a consideration of the historical factors which have contributed to the current philosophy and pattern of services throughout North America, and specifically in British Columbia, the paper reports on a qualitative study using participant observation, informal and formal interviews, and Strauss' Constant Comparative Methods which was undertaken to identify the needs of the mentally ill individuals who are serving a term of imprisonment in the Health Care Centre of the Lower Mainland Regional Correctional Centre. Altogether there were eighteen formal participants. They included six mentally ill offenders, six correctional personnel, and six health care professionals. A critical analysis of the major findings -alienation, lack of organizational commitment, and the incongruencies between our social policies and practices - provided the basis for program recommendations. The challenge lies in the building of a vision that values humane treatment for the marginal members of our society.
An atom-photon pair laser
Creators: name: Salzburger, Thomas
name: Ritsch, Helmut
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the quantum dynamics of an ultracold atomic gas in a deep optical lattice within an optical high-$Q$ resonator. The atoms are coherently illuminated with the cavity resonance tuned to a blue vibrational sideband, so that photon scattering to the resonator mode is accompanied by vibrational cooling of the atoms. This system exhibits a threshold above which pairwise stimulated generation of a cavity photon and an atom in the lowest vibrational band dominates spontaneous scattering and we find a combination of optical lasing with a buildup of a macroscopic population in the lowest lattice band. Including output coupling of ground-state atoms and replenishing of hot atoms into the cavity volume leads to a coherent, quantum correlated atom-photon pair source very analogous to twin light beam generation in a nondegenerate optical parametric oscillator.
description: 10 pages, 4 figures
Environment dependent vibrational heat transport in molecular Junctions : Rectification, quantum effects, vibrational mismatch
Creators: name: Behera, Jayasmita
name: Bandyopadhyay, Malay
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Vibrational heat transport in molecular junctions is a central issue in different contemporary research areas like Chemistry, material science, mechanical engineering, thermoelectrics and power generation. Our model system consists of a chain of molecules which sandwiched between two solids that are maintained at different temperatures. We employ quantum self-consistent reservoir model, which is built on generalized quantum Langevin equation, to investigate quantum effects and far from equilibrium conditions on thermal conduction at nanoscale. The present self-consistent reservoir model can easily mimic the phonon-phonon scattering mechanisms. Different thermal environments are modelled as (i) Ohmic, (ii) sub-Ohmic, and (iii) super-Ohmic environment and their effects are demonstrated for the thermal rectification properties of the system with spring graded or mass graded feature. The behavior of heat current across molecular junctions as a function of chain length, temperature gradient and phonon scattering rate are studied. Further, our analysis reveals the effects of vibrational mismatch between the solids phonon spectra on heat transfer characteristics in molecular junctions for different thermal environments.
description: arXiv admin note: text overlap with arXiv:1810.09888 by other authors
title: The Dystopian Reality of Healthcare for Women in Texas
Creators: name: Adrogue, Athena
Publisher: name: The University of Texas at Austin
Year: 2024
Subjects: subject: Abortion
subject: reproductive healthcare
subject: reproductive rights
subject: maternal mortality
subject: physician
subject: attorney

description: Through qualitative interviews with five obstetrician gynecologists and five attorneys (three prosecutors, one defense attorney, and one hospital general counsel), this project exposes a future for Texas women in a post-Roe v. Wade climate. The thesis illustrates how legislative changes impact more than abortion issues, with increasing maternal death rates, dangerous medical implications, and stymied practitioners. For example, a woman experiencing a miscarriage is no longer able to receive pre-Roe medical services, such as dilation and evacuation (D&E), without a fever or “life-threatening” symptoms. Through meticulous facts, I show the need to shift conversations from politics to public health. Directly, this thesis demonstrates the benefits of aligning doctors’ justified fear-based concerns with prosecutors’ “wait-and-see” realities in a more conclusive dialogue. The beliefs and challenges of these stakeholders, previously viewed as opposing ends of an in-flux spectrum, should be concurrently considered. This project establishes this reality while exposing areas of focus for future conversations. This work should also inspire research focused on improving the lives and health of Texas women.
III. Filosofe dell’educazione come eredi del razionalismo critico. Da Colicchi a Fadda, da Xodo a Mortari: quattro modelli
Creators: name: Cambi, Franco
Publisher: name: Studi sulla Formazione
Year: 2014

description: The article presents four contemporary Italian philosophers of educations, that are inspirited by critical rationalism and it points out their critical function.
description: Studi sulla Formazione, Anno XVII, I-2014
title: Media Literacy Education in Texas K-12 Public Schools: The Social Media Education Gap and its effect on Adolescent Girls
Creators: name: Aghayeva, Sariyya
Publisher: name: The University of Texas at Austin
Year: 2024
Subjects: subject: Education
subject: Media Literacy
subject: Social Media
subject: Youth
subject: Adolescents
subject: Texas
subject: Education Policy

description: This research paper analyzes the social media educational gap that exists within Media Literacy Education (hereafter referenced as MLE) in Texas K-12 public schools. Media Literacy policies published by the Texas Education Agency and Texas Board of Education, coupled with comparative statistics on Texas public school districts, reveal the inadequacy of MLE standards having been met by school boards and educators on the classroom level. Not only are schools prioritizing which standards required by Texas MLE policies should be met (based on a variety of factors such as educators' personal preferences, level of instructor education on technology, access to technology, parental involvement etc.) but district case studies also reveal little to no education on social media. The only proven methods through which the adverse effects of social media are taught in K-12 public schools are by covering cyberbullying (both in middle schools and high schools), revenge porn, digital citizenship in the most basic form, and sexting (Luevanos 2020). Moreover, this project highlights the direct link between insufficient education on social media navigation and its impact on the academic and psychological development of adolescent girls. Finally, this research paper recognizes the plethora of body image issues that arise amongst female youth due to the lack of social media education within the field of Media Literacy in Texas. The ultimate proposal of this project is to emphasize the importance of teaching adolescent girls and pre-teens / teens how to filter harmful misinformation on commonly utilized mainstream media apps such as Twitter (now formally known as "X"), Tik Tok, Snapchat, and Instagram. This paper also provides suggestions on what should be changed on the classroom level to ensure the safe development of adolescents in a fast-paced social media dominated world.
Epochal problems of philosophy of education, today. Technology, posthuman, neuroscience
Creators: name: Cambi, Franco
Publisher: name: Studi sulla Formazione
Year: 2014

description: The article presents three crucial aspects of philosophical research in pedagogy: the role of technology, the post-human, the relation with neurosciences. These aspects should be rethought critically, always.
description: Studi sulla Formazione, Anno XVII, I-2014
Per una pedagogia dell’“intercultura”
Creators: name: Cambi, Franco
Publisher: name: Studi sulla Formazione
Year: 2014

description: The intercultural pedagogy has an ontological horizon, that is defined in this article by a complex net of ontological categories. The function of ontology isn’t only constitutive, but also (and especially) regulative.
description: Studi sulla Formazione, Anno XVII, I-2014
Privacy and Trust Redefined in Federated Machine Learning
Creators: name: Papadopoulos, Pavlos
name: Abramson, Will
name: Hall, Adam J.
name: Pitropakis, Nikolaos
name: Buchanan, William J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computers and Society (cs.CY)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: A common privacy issue in traditional machine learning is that data needs to be disclosed for the training procedures. In situations with highly sensitive data such as healthcare records, accessing this information is challenging and often prohibited. Luckily, privacy-preserving technologies have been developed to overcome this hurdle by distributing the computation of the training and ensuring the data privacy to their owners. The distribution of the computation to multiple participating entities introduces new privacy complications and risks. In this paper, we present a privacy-preserving decentralised workflow that facilitates trusted federated learning among participants. Our proof-of-concept defines a trust framework instantiated using decentralised identity technologies being developed under Hyperledger projects Aries/Indy/Ursa. Only entities in possession of Verifiable Credentials issued from the appropriate authorities are able to establish secure, authenticated communication channels authorised to participate in a federated learning workflow related to mental health data.
description: MDPI Mach. Learn. Knowl. Extr. 2021, 3(2), 333-356; https://doi.org/10.3390/make3020017
On the CO Near-IR Band and the Line Splitting Phenomenon in the Yellow Hypergiant Rho Cassiopeiae
Creators: name: Gorlova, N.
name: Lobel, A.
name: Burgasser, A.
name: Rieke, G.
name: Ilyin, I.
name: Stauffer, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on multi-epoch optical and near-infrared spectroscopy around the first overtone ro-vibrational band of CO in the pulsating yellow hypergiant Rho Cas, one of the most massive stars in the Galaxy and a candidate SN II progenitor. We argue that the double cores of the CO absorption lines, that have previously been attributed to separate circumstellar shells expelled during its recurrent outbursts, result in fact from a superposition of a wide absorption line and a narrow central emission line. The CO line doubling returns over subsequent pulsation cycles, where the superposed line emission assumes its largest intensity near phases of maximum light. We find that the morphology and behavior of the CO band closely resemble the remarkable "line-splitting phenomenon" also observed in optical low-excitation atomic lines. Based on radiative transport calculations we present a simplified model of the near-IR CO emission emerging from cooler atmospheric layers in the immediate vicinity of the photosphere. We speculate that the kinetic temperature minimum in our model results from a periodical pulsation-driven shock wave. We further discuss a number of alternative explanations for the origin of the ubiquitous emission line spectrum, possibly due to a quasi-chromosphere or a steady shock wave at the interface of a fast expanding wind and the ISM. We present a number of interesting spectroscopic similarities between Rho Cas and other types of cool variable supergiants such as the RV Tau and R CrB stars. We further propose a possibly common mechanism for the enigmatic outburst behavior of these luminous pulsating cool stars.
description: accepted to ApJ; 3 color figs
The HARPS search for southern extra-solar planets XLV. Two Neptune mass planets orbiting HD 13808: a study of stellar activity modelling's impact on planet detection
Creators: name: Ahrer, E.
name: Queloz, D.
name: Rajpaul, V. M.
name: Ségransan, D.
name: Bouchy, F.
name: Hall, R.
name: Handley, W.
name: Lovis, C.
name: Mayor, M.
name: Mortier, A.
name: Pepe, F.
name: Thompson, S.
name: Udry, S.
name: Unger, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a comprehensive analysis of 10 years of HARPS radial velocities of the K2V dwarf star HD 13808, which has previously been reported to host two unconfirmed planet candidates. We use the state-of-the-art nested sampling algorithm PolyChord to compare a wide variety of stellar activity models, including simple models exploiting linear correlations between RVs and stellar activity indicators, harmonic models for the activity signals, and a more sophisticated Gaussian process regression model. We show that the use of overly-simplistic stellar activity models that are not well-motivated physically can lead to spurious `detections' of planetary signals that are almost certainly not real. We also reveal some difficulties inherent in parameter and model inference in cases where multiple planetary signals may be present. Our study thus underlines the importance both of exploring a variety of competing models and of understanding the limitations and precision settings of one's sampling algorithm. We also show that at least in the case of HD 13808, we always arrive at consistent conclusions about two particular signals present in the RV, regardless of the stellar activity model we adopt; these two signals correspond to the previously-reported though unconfirmed planet candidate signals. Given the robustness and precision with which we can characterize these two signals, we deem them secure planet detections. In particular, we find two planets orbiting HD 13808 at distances of 0.11, 0.26 AU with periods of 14.2, 53.8 d, and minimum masses of 11, 10 Earth masses.
description: 17 pages, 6 figures, 13 tables, accepted for publication in MNRAS
Προγράμματα προαγωγής της ψυχικής υγείας με έμφαση στις κοινωνικές σχέσεις των παιδιών: μια κριτική προσέγγιση
Creators: name: Αντωνιάδου, Ευθυμία Ε.
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Κοιωνικές σχέσεις παιδιών
Παιδική ηλικία
Ανάλυση λόγου
Children's interpersonal relationships
Childhood
Discourse analysis

description: Η μελέτη στοχεύει στη συμμετοχή των εκπαιδευτικών και παιδιών της πρωτοβάθμιας εκπαίδευσης στην εφαρμογή των προγραμμάτων αγωγής της υγείας με έμφαση στις κοινωνικές σχέσεις των παιδιών. Το θεωρητικό υπόβαθρο της μελέτης διαμορφώθηκε με βάση τις αρχές της κονστρουκτιβιστικής θεωρίας και της νέας κοινωνιολογίας της παιδικής ηλικίας. Στόχος της έρευνας είναι να διερευνήσει α) της απόψεις παιδιών και εκπαιδευτικών σχετικά με την εφαρμογή των προγραμμάτων στο σχολείο, β)τους τρόπους με τους οποίους συζητούν για τις κοινωνικές σχέσεις των παιδιών, γ) τις κοινές ή διαφορετικές κατανοήσεις από τη συμμετοχή τους στο πρόγραμμα. Στην έρευνα συμμετέχου 66 εκπαιδευτικό της πρωτοβάθμιας εκπαίδευσης χωρισμένοι σε 14 ομάδες εστίασης και 107 παιδιά χωρισμένα σε 14 ομάδες. Οι συμμετέχοντες συζήτησαν σχετικά με το περιεχόμενο των προγραμμάτων και τη μεταξύ τους συνεργασία. Οι εκπαιδευτικοί συζήτησαν επιπλέον για το ρόλο τους. Στην ανάλυση αναζητήθηκαν τα ερμηνευτικά ρεπερτόρια, οι θέσεις υποκειμένου και τα ιδεολογικά διλήμματα
description: The present doctoral thesis explores primary teachers' and students' discourses on their participation in the implementation of a mental health promotion program focusing on children's interpersonal relationships. The study's theoretical and methodological background lies on the principles of the constructivism theory and on the new sociology of childhood. The study aims at identifying teachers' and children's : a)views on the implementary of the programs in school setting b)discourse on children's interpersonal relationships, c)mutual οr distinct perceptions on the implementation of the program, d)constructions of childhood. 14 focus groups with teachers and 14 focus groups were analysed according to the principles pf discourse analysis : we tried to identify interpretive repertoires, subject positions and ideological dilemmas
Rough translation of file 030_A (collection LA 256)
Creators: name: Parker, Verdena
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-150815-08: rough translation (30 second to 3-4 minute chunks) of file 030_A (tape 30, side A) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 30:55 to end; no transcription in this session, translation only. Due to re-numbering, tape 030_A has been assigned to the CLA item number LA256.030, audio file LA256.030A.
Intercultural curriculum in neo-nationalist Europe
Creators: name: Campani, Giovanna
Publisher: name: Studi sulla Formazione
Year: 2014

description: The article presents the models of the intercultural curriculum in Europe, today; it points out that explicit intercultural curricula are not part of the mainstream European educations systems. The author denounces also the attack to multicul- turalism done by some European governments.
description: Studi sulla Formazione, Anno XVII, I-2014
Estimation with multivariate extreme value distributions with applications to environmental data
Creators: name: Chen, Youshi
Publisher: name: University of British Columbia
Year: 2010

description: Several parametric families of multivariate extreme value distributions (Hüsler and Reiss 1989, Tawn 1990, Joe 1990a, 1990b) have been proposed recently. Applications to multivariate extreme value data sets are needed to assess the adequacy of the known families in their fit to data. Different families are compared in their range of multivariate dependence and their ease of use for maximum likelihood estimation. Some useful conclusions have been made from experience with several environmental data sets.
Quantum Optical Systems for the Implementation of Quantum Information Processing
Creators: name: Ralph, T. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review the field of Quantum Optical Information from elementary considerations through to quantum computation schemes. We illustrate our discussion with descriptions of experimental demonstrations of key communication and processing tasks from the last decade and also look forward to the key results likely in the next decade. We examine both discrete (single photon) type processing as well as those which employ continuous variable manipulations. The mathematical formalism is kept to the minimum needed to understand the key theoretical and experimental results.
Μελέτη των επιπτώσεων οξειδωτικών και αντιοξειδωτικών παραγόντων που επηρεάζουν την ποιότητα του συντηρημένου και του κατεψυγμένου σπέρματος σκύλου
Creators: name: Μιχαήλ, Αννέττα Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Συντηρημένο σπέρμα
Αντιοξειδωτικά
Extended semen
Antioxidants

description: Σκοπός της διατριβής ήταν η μελέτη των επιπτώσεων ορισμένων οξειδωτικών παραγόντων στα σπερματοζωάρια του σκύλου, καθώς και της επίδρασης διαφόρων αντιοξειδωτικών ουσιών(βιταμίνη C, ακετυλοκυστείνη, ταυρίνη, καταλάση, βιτμίνη Ε ή Β16) στα αραιωτικά του συντηρημένου και του κατεψυγμένου-αποψυγμένου σπέρματος, Οι δραστικές μορφές οξυγόνου αυξάνονται κατά τις διαδικασίες διατήρησης του σπέρματος του σκύλου και επηρεάζουν αρνητικά τη βιωσιμότητα των σπερματοζωαρίων. Η προσθήκη αντιοξειδωτικών ουσιών στα αραιωτικά του σπέρματος μπορεί να συμβάλλει θετικά στη βιωσιμότητα των σπερματοζωαρίων, σε συνθήκες συντήρησης ή κατάψυξης. Η θετική επίδραση των αντιοξειδωτικών δεν συνοδεύεται απαραίτητα από σημαντική μεταβολή των συγκεντρώσεων των δραστικών μορφών οξυγόνου. Ανάλογα με το χρόνο και τον τρόπο διατήρησης του σπέρματος διαφορετικά αντιοξειδωτικά επιδεικνύουν τα καλύτερα αποτελέσματα. Στο συγκεκριμένο πειραματισμό, κατά τη συντήρηση του σπέρματος τη μεγαλύτερη προστασία προσέφεραν οι λιποδιαλυτές ουσίες βιταμίνη Ε και Β16, ενώ κατά την κατάψυξη, η κατάλυση
description: The objective of this study was to evaluate quality of extended and frozen-thawed of semen processed with extenders containg various antioxidants[vitamin C, N-acetyl-L-cysteine(NAC), taurine, catalase, vitamin E or 5-(4-dimentlylaminophenyl)-2-phenyl-penta-2,4-dienoic acid(B16)] and evaluate the effect of certain oxidant factors(supeoxide anion, hydroxyl radical, total reactive oxygen species) on canine semen and are responsible for the reduced survival of spermatozoa. Antioxidant supplementation of canine spermatozia can benefit the quality of preserved semen samples. The positive effects of antioxidants are demonstrated even when reactive oxygen species values are not sugnificantly altered. According to the semen preservation producers different antioxidants demonstrate the most positive effects to spermatozoa. The results suggest that the most pronounced effect in preserving semen quality of chilled dog spermatozoa was achieved then use of the lipophilic compounds vitamin E and B16. On the other hand, the enzyme catalase had the most pronounced effect in improving post-thaw quality of canine-spermatozoa
Hydrodynamic Flow and Jet Induced Mach Shocks at RHIC and LHC
Creators: name: Stöcker, Horst
name: Betz, Barbara
name: Rau, Philip
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss the present collective flow signals for the phase transition to quark-gluon plasma (QGP) and the collective flow as a barometer for the equation of state (EoS). A study of Mach shocks induced by fast partonic jets propagating through the QGP is given. We predict a significant deformation of Mach shocks in central Au+Au collisions at RHIC and LHC energies as compared to the case of jet propagation in a static medium. Results of a hydrodynamical study of jet energy loss are presented.
description: 15 pages, 8 figures
Didattica per studenti con disabilità visiva: una lezione multimediale di “Metodologia della Riabilitazione”
Creators: name: De Piano, Angela
Publisher: name: Studi sulla Formazione
Year: 2014

description: This research was born with the aim of improving the logistical and educational support for university students who are visually impaired. For this purpose it has been developed a prototype of multimedia lesson concerning the field of Physical Therapy. The prototype has been tested on a representative sample of visually impaired students of the University of Firenze. Below I would like to present a description of the phases of this research, from the planning to the doing.
description: Studi sulla Formazione, Anno XVII, I-2014