cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Influence of Nanosize Hole Defects and their Geometric Arrangements on the Superfluid Density in Atomically Thin Single Crystals of Indium Superconductor
Creators: name: Liu, Mengke
name: Nam, Hyoungdo
name: Kim, Jungdae
name: Fiete, Gregory A.
name: Shih, Chih-Kang
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Indium

description: Using Indium √𝟕  √𝟑 on Si(111) as an atomically thin superconductor platform, and by systematically controlling the density of nano-hole defects (nanometer size voids), we reveal the impacts of defects density and defects geometric arrangements on superconductivity at macroscopic and microscopic length scales. When nano-hole defects are uniformly dispersed in the atomic layer, the superfluid density monotonically decreases as a function of defect density (from 0.7% to 5% of the surface area) with minor change in the transition temperature Tc, measured both microscopically and macroscopically. With a slight increase in the defect density from 5% to 6%, these point defects are organized into defect chains that enclose individual two-dimensional patches. This new geometric arrangement of defects dramatically impacts the superconductivity, leading to the total disappearance of macroscopic superfluid density and the collapse of the microscopic superconducting gap. This study sheds new light on the understanding of how local defects and their geometric arrangement impact superconductivity in the two-dimensional limit.
Effect of the $δ$-meson on the instabilities of nuclear matter under strong magnetic fields
Creators: name: Rabhi, A.
name: Providencia, C.
name: Da Providencia, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the influence of the isovector-scalar meson on the spinodal instabilities and the distillation effect in asymmetric non-homogenous nuclear matter under strong magnetic fields, of the order of $10^{18}-10^{19}$ G. Relativistic nuclear models both with constant couplings (NLW) and with density dependent parameters (DDRH) are considered. A strong magnetic field can have large effects on the instability regions giving rise to bands of instability and wider unstable regions. It is shown that for neutron rich matter the inclusion of the $δ$ meson increases the size of the instability region for NLW models and decreases it for the DDRH models. The effect of the $δ$ meson on the transition density to homogeneous $β$-equilibrium matter is discussed. The DDRH$δ$ model predicts the smallest transition pressures, about half the values obtained for NL$δ$.
description: 6 pages, 5 figues, 3 tables, accepted for publication in Phys. Rev. C
Jet energy loss and high $p_T$ photon production in hot quark-gluon plasma
Creators: name: Qin, G. -Y.
name: Gale, C.
name: Jeon, S.
name: Moore, G. D.
name: Ruppert, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Jet-quenching and photon production at high transverse momentum are studied at RHIC energies, together with the correlation between jets and photons. The energy loss of hard partons traversing the hot QGP is evaluated in the AMY formalism, consistently taking into account both induced gluon emission and elastic collisions. The production of high $p_T$ photons in Au+Au collisions is calculated, incorporating a complete set of photon-production channels. Putting all these ingredients together with a (3+1)-dimensional ideal relativistic hydrodynamical description of the thermal medium, we achieve a good description of the current experimental data. Our results illustrate that the interaction between hard jets and the soft medium is important for a complete understanding of jet quenching, photon production, and photon-hadron correlations in relativistic nuclear collisions.
description: 4 pages, 4 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee
Resolving photon-shortage mystery in femtosecond magnetism
Creators: name: Si, M. S.
name: Zhang, G. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: For nearly a decade, it has been a mystery why the small average number of photons absorbed per atom from an ultrashort laser pulse is able to induce a strong magnetization within a few hundred femtoseconds. Here we resolve this mystery by directly computing the number of photons per atom layer by layer as the light wave propagates inside the sample. We find that for all the 24 experiments considered here, each atom has more than one photon. The so-called photon shortage does not exist. By plotting the relative demagnetization change versus the number of photons absorbed per atom, we show that depending on the experimental condition, 0.1 photon can induce about 4% to 72% spin moment change. Our perturbation theory reveals that the demagnetization depends linearly on the amplitude of laser field. In addition, we find that the transition frequency of a sample may also play a role in magnetization processes. As far as the intensity is not zero, the intensity of the laser field only affects the matching range of the transition frequencies, but not whether the demagnetization can happen or not.
description: 17 pages, 3 figures, 1 table
Nonlinear plasmonic slot waveguides
Creators: name: Davoyan, A. R.
name: Shadrivov, I. V.
name: Kivshar, Yu. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We study nonlinear modes in subwavelength slot waveguides created by a nonlinear dielectric slab sandwiched between two metals. We present the dispersion diagrams of the families of nonlinear plasmonic modes and reveal that the symmetric mode undergoes the symmetry-breaking bifurcation with the energy primarily localized near one of the interfaces. We also find that the antisymmetric mode may split into two brunches giving birth to two families of nonlinear antisymmetric modes.
description: 6 pages, 5 figures
title: 12% efficient CdTe/CdS thin film solar cells deposited by low-temperature close space sublimation
Creators: name: Schaffner, Judith
name: Motzko, Markus
name: Tueschen, Alexander
name: Swirschuk, Andreas
name: Schimper, Hermann-Josef
name: Klein, Andreas
name: Modes, Thomas
name: Zywitzki, Olaf
name: Jaegermann, Wolfram
Publisher: name: AIP Publishing
Year: 2021

description: We report 12% efficient CdS/CdTe thin film solar cells prepared by low temperature close space sublimation (CSS). Both semiconductor films, CdS and CdTe, were deposited by high vacuum CSS in superstrate configuration on glass substrates with fluorine doped tin oxide (FTO) front contact. The CdTe deposition was carried out at a substrate temperature (Tsub) of 340° C, which is much lower than that used in conventional processes (>500° C). The CdTe films were treated with the usual CdCl2 activation process. Different optimal annealing times and temperatures were found for low-temperature cells (Tsub 340° C) compared to high-temperature cells (Tsub ¼ 520° C). The influence of the activation step on the morphology of high-temperature and low-temperature CdTe is determined by XRD, AFM, SEM top views, and SEM cross-sections. Grain growth, strong recrystallization, and a reduction of planar defects during the activation step are observed, especially for low-temperature CdTe. Further, the influence of CdS deposition parameters on the solar cell performance is investigated by using three different sets of parameters with different deposition rates and substrate temperatures for the CdS preparation. Efficiencies about 10.9% with a copper-free back contact and 12.0% with a copper-containing back contact were achieved using the low temperature CdTe process.
Nonperturbative Thermodynamic Geometry of Anyon Gas
Creators: name: Mirza, Behrouz
name: Mohammadzadeh, Hosein
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Following our earlier work on the Ruppeiner geometry of an anyon gas [B. Mirza and H. Mohammadzadeh, Phys. Rev. E {\bf 78,} 021127 (2008)], we will derive nonperturbative thermodynamic curvature of a two-dimensional ideal anyon gas. At different values of the thermodynamic parameter space, some unique and interesting behaviors of the anyon gas are explored. A complete picture of attractive and repulsive phases of the anyon gas is given.
description: 20 pages
Spin-phonon interaction in yttrium iron garnet
Creators: name: Olsson, Kevin S.
name: Choe, Jeongheon
name: Rodriguez-Vega, Martin
name: Khalsa, Guru
name: Benedek, Nicole A.
name: He, Jiaming
name: Fang, Bin
name: Zhou, Jianshi
name: Fiete, Gregory A.
name: Li, Xiaoqin
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: yttrium

description: Spin-phonon interaction is an important channel for spin and energy relaxation in magnetic insulators. Understanding this interaction is critical for developing magnetic insulator-based spintronic devices. Quantifying this interaction in yttrium iron garnet (YIG), one of the most extensively investigated magnetic insulators, remains challenging because of the large number of atoms in a unit cell. Here, we report temperature-dependent and polarization-resolved Raman measurements in a YIG bulk crystal. We first classify the phonon modes based on their symmetry. We then develop a modified mean-field theory and define a symmetry-adapted parameter to quantify spin-phonon interaction in a phonon-mode specific way in YIG. Based on this improved mean-field theory, we discover a positive correlation between the spin-phonon interaction strength and the phonon frequency.
Is Projection Mapping Natural? Towards Physical World Augmentation Consistent with Light Field Context
Creators: name: Iwai, Daisuke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Graphics (cs.GR)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Projection mapping seamlessly merges real and virtual worlds. Although much effort was made to improve its image qualities so far, projection mapping is still unnatural. We introduce the first steps towards natural projection mapping by making the projection results consistent with the light field context of our daily scene.
A criação de blogues no âmbito do Programa Nacional de Ensino do Português (PNEP)
Creators: name: Lopes, Célia
name: Santos, Maria Manuel
name: Antunes, Ricardo
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: O Programa Nacional de Ensino do Português (PNEP) visava a formação dos professores do 1º Ciclo do Ensino Básico para o ensino do Português e pretendia contribuir para o aprofundamento de conhecimentos científicos e didáticos nesta área. Este programa permitiu a realização de experiências de desenvolvimento curricular, a reflexão sobre as metodologias e as estratégias utilizadas, bem como a criação de dinâmicas de trabalho entre docentes, com vista a um investimento continuado no ensino da língua. O programa não contemplava a divulgação de práticas de sala de aula através de blogues. Contudo, durante os três anos de implementação, surgiram inúmeros blogues, que se integram no corpus latente da internet e apresentam um elevado potencial de análise. Neste artigo apresenta-se um estudo de caso referente à análise de três blogues produzidos no âmbito da formação PNEP. Estes foram selecionados para análise tendo em conta a finalidade da sua criação e a tipologia dos posts neles publicados. Verificou-se que os blogues analisados funcionavam como repositório exemplificativo de atividades desenvolvidas em sala de aula e de materiais didáticos produzidos, durante a sua vigência. Os posts eram constituídos, essencialmente, por textos e fotografias, maioritariamente publicados pelos administradores dos blogues.
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
RAQAMLI JURNALISTIKANING KELAJAGI
Creators: name: Rasulova, Sevara
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada raqamli jurnalistikaning rivojlanish bosqichlari, zamonaviy tendensiyalari va kelajak istiqbollari yoritiladi. Raqamli texnologiyalar jurnalistikaga olib kirgan o‘zgarishlar, sun’iy intellekt va avtomatlashtirish jarayonlari, shuningdek, auditoriyaning o‘zgaruvchan talablari tahlil qilinadi.
title: Creating a Critical Pedagogy of Place with Marginalized Youth in Barrio Logan
Creators: name: Gigliotti, Angela
Publisher: name: Goldsmiths, University of London
Year: 2019

description: This practice-based research explored possibilities for creating new life narratives through the arts with youth in Barrio Logan, California. The research questions were: How are new life narratives created through the practice of poetry, music and art in the lives of marginalized youth? How can a collaborative curatorial practice be used as a critical pedagogy of place? The questions arose from the researcher’s practice as a teacher/curator and artist and were approached using an emergent arts-based methodology. Conversations, in the form of testimonios, and collaborative curation were also used as transformative and disruptive methodologies. Youth identities and making of place were explored drawing from theories of place and concepts of belonging. Through the work of this practice, a concept termed fugitive space was developed. The notion of fugitive space moved the term fugitive away from the negative connotation to a departure point for escape—rupture. The students, as both participants and collaborators, were encouraged to share alternative stories rather than problem stories often associated with the deficit models used in educational settings. The emphasis was on reflecting, initiating discussions and exposing tensions rather than solving issues. Counter-stories were present in the conversations and offered narratives that disrupted the labels of ‘at risk’ youths or ‘juvenile delinquents’. The writing, performing and sharing of poetry and rap music was central to the telling of these narratives and as a form of collaborative curation. Through the practice of collaborative curation, the students, as artists and activists, took on the role of critical pedagogues which served to disrupt the hierarchies of power within the gallery space. The stories, in the form of testimonios, included symbols of Aztlán that occupied both physical and symbolic spaces in Barrio Logan and contributed to the formation of Chicana/o identity. Through the testimonios, conversations that interrogated power structures were initiated with the community and created a place-belongingness. The outcomes of this practice-based research showed that new life narratives and new stories of place emerged forming a critical pedagogy of place and contributed a place-based educational practice that could be used by educators and other youth practitioners. Furthermore, the practice of collaborative curation initiated dialogical encounters that opened a context for the disruption of dominate narratives and the transmission of traumatic memories— a fugitive space.
Hardware-friendly Deep Learning by Network Quantization and Binarization
Creators: name: Qin, Haotong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Quantization is emerging as an efficient approach to promote hardware-friendly deep learning and run deep neural networks on resource-limited hardware. However, it still causes a significant decrease to the network in accuracy. We summarize challenges of quantization into two categories: Quantization for Diverse Architectures and Quantization on Complex Scenes. Our studies focus mainly on applying quantization on various architectures and scenes and pushing the limit of quantization to extremely compress and accelerate networks. The comprehensive research on quantization will achieve more powerful, more efficient, and more flexible hardware-friendly deep learning, and make it better suited to more real-world applications.
Local density of states in disordered two-dimensional electron gases at high magnetic field
Creators: name: Champel, Thierry
name: Florens, Serge
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Motivated by high-accuracy scanning tunneling spectroscopy measurements on disordered two-dimensional electron gases in strong magnetic field, we present an exact solution for the local density of states (LDoS) of electrons moving in an arbitrary potential smooth on the scale of the magnetic length, that can be locally described up to its second derivatives. We use a technique based on coherent state Green's functions, allowing us to treat on an equal footing confining and open quantum systems. The energy-dependence of the LDoS is found to be universal in terms of local geometric properties, such as drift velocity and potential curvature. We also show that thermal effects are quite important close to saddle points, leading to an overbroadening of the tunneling trajectories.
description: 4 pages, 3 figures ; typos corrected + one reference updated
Union-find quantum decoding without union-find
Creators: name: Griffiths, Sam J.
name: Browne, Dan E.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The union-find decoder is a leading algorithmic approach to the correction of quantum errors on the surface code, achieving code thresholds comparable to minimum-weight perfect matching (MWPM) with amortised computational time scaling near-linearly in the number of physical qubits. This complexity is achieved via optimisations provided by the disjoint-set data structure. We demonstrate, however, that the behaviour of the decoder at scale underutilises this data structure for twofold analytic and algorithmic reasons, and that improvements and simplifications can be made to architectural designs to reduce resource overhead in practice. To reinforce this, we model the behaviour of erasure clusters formed by the decoder and show that there does not exist a percolation threshold within the data structure for any mode of operation. This yields a linear-time worst-case complexity for the decoder at scale, even with a naive implementation omitting popular optimisations.
title: Band lineup of lattice mismatched InSe/GaSe quantum well structures prepared by van der Waals epitaxy: Absence of interfacial dipoles
Creators: name: Lang, O.
name: Klein, Andreas
name: Pettenkofer, Christian
name: Jaegermann, Wolfram
name: Chevy, Alain
Publisher: name: AIP Publishing
Year: 2021

description: Epitaxial growth of the strongly lattice mismatched (6.5%) layered chalcogenides InSe and GaSe on each other is obtained with the concept of van der Waals epitaxy as proven by low‐energy electron diffraction and scanning tunnel microscope. InSe/GaSe/InSe and GaSe/InSe/GaSe quantum well structures were prepared by molecular beam epitaxy and their interface properties were characterized by soft x‐ray photoelectron spectroscopy. Valence and conduction band offsets are determined to be 0.1 and 0.9 eV, respectively, and do not depend on deposition sequence (commutativity). As determined from the measured work functions the interface dipole is 0.05 eV; the band lineup between the two materials is correctly predicted by the Anderson model (electron affinity rule).
Scholars’ YouTube channels: content analysis of educational videos
Creators: name: Martinho, Mariana
name: Pinto, Marta
name: Kuznetsova, Yuliya
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: YouTube is a Web 2.0 platform of distributed video sharing, widely used by students, universities and scholars. This article looks into the YouTube channels set by three scholars - Dave Cormier, Wendy Drexler and Michael Wesch -, whose research interests are linked to technology enhanced learning. The focus of analysis is on the sample of videos each scholar uploaded and categorized as “education” in their YouTube channels. The data collected from the content analysis allows to understand what content is being shared and with what approach. The overall results suggest that those scholars who have a channel as personal, or as officially linked to the university, share videos produced as a result of their work as scholars, some of which even share copyright with the institution. All the videos address similar concepts and ideas regarding the integration and use of technology in education, but the approach to present them differs.
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
Constraints on star formation in NGC2264
Creators: name: Parker, Richard J.
name: Schoettler, Christina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We quantify the spatial distribution of stars for two subclusters centred around the massive/intermediate mass stars S Mon and IRS1/2 in the NGC2264 star-forming region. We find that both subclusters are have neither a substructured, nor a centrally concentrated distribution according to the Q-parameter. Neither subcluster displays mass segregation according to the $Λ_{\rm MSR}$ ratio, but the most massive stars in IRS1/2 have higher relative surface densities according to the $Σ_{\rm LDR}$ ratio. We then compare these quantities to the results of N-body simulations to constrain the initial conditions of NGC2264, which are consistent with having been dense ($\tildeρ \sim 10^4$M$_\odot$pc$^{-3}$), highly substructured and subvirial. These initial conditions were also derived from a separate analysis of the runaway and walkaway stars in the region, and indicate that star-forming regions within 1kpc of the Sun likely have a broad range of initial stellar densities. In the case of NGC2264, its initial stellar density could have been high enough to cause the destruction or truncation of protoplanetary discs and fledgling planetary systems due to dynamical encounters between stars in the early stages of its evolution.
description: 13 pages, 5 figures, 4 tables, 1 short appendix. Accepted for publication in MNRAS. This paper complements the results from Schoettler et al 2021 (see arXiv:2111.14892)
Computer-controlled microscope for the automatic classification of white blood cells.
Creators: name: Gabert, Howard Frederick
Publisher: name: University of British Columbia
Year: 2011

description: A microscope was interfaced to a PDP-9 computer in order to develop techniques suitable for on-line classification of white blood cells. The computer visual-input system is composed of an image dissector optically coupled to a microscope used in a transmitted light mode. The position of the slide under the microscope and the fine focus control are controllable from the computer. A technique of auto-focusing was developed to efficiently focus the microscope under computer control. This algorithm is described in detail, followed by a discussion of the physical factors that affect the performance of this technique. A method of locating or isolating the leukocytes (white blood cells) is described next. A constant, referred to as the "contrast ratio' is used to extract the threshold for the nuclei of the leukocytes based on the average background intensity. Finally, contour tracing and curvature function extraction are used as a means of testing the system. A specific test is conducted to obtain a comparison of the system's efficiency as compared to that of "manual" techniques used by a technician. The system described here is not only suitable for automatic leukocyte classification, but could also be used for many other routine tests requiring the examination of microscopic cells.
Análise das perguntas de física no site “Seara da Ciência”
Creators: name: Fernandes, Rosa Brígida Quadros
name: Souza, Francislê Neri De
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: É possível retirar das perguntas dos alunos informação importante para a adoção de um ensino mais centrado nas características vivenciais e motivacionais dos alunos. Neste artigo foram analisadas 102 perguntas de física submetidas ao site de ciências: “Seara da Ciência”. As perguntas analisadas foram classificadas com referência a três esquemas de codificação, associados ao i) interesse pela aprendizagem da física: o conteúdo ou área de física, ii) o contexto ou utilidade da pergunta (pessoal, profissional, escolar) e a iii) conexão ao quotidiano ou ao conhecimento prévio. A análise quantitativa realizada, utilizando o SPSS, permitiu concluir sobre as relações entre estes esquemas. Verificou-se uma relação significativa entre o conteúdo e o contexto, sendo que as perguntas de mecânica são principalmente escolares, as de interações e campos são profissionais e as de fenómenos ondulatórios e física moderna são pessoais. Foram registadas perguntas de conexão ao quotidiano ou ao conhecimento prévio em todas as áreas de física consideradas. Constatou-se, com um menor grau de significância, que as perguntas pessoais apresentam características conectivas, atendendo a que nestas os autores tentam ligar o quotidiano à física (conectivas) e nas perguntas profissionais e escolares não é verificada essa tentativa de ligação.
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
Lateral magnetic anisotropy superlattice out of a single (Ga,Mn)As layer
Creators: name: Dengel, R. G.
name: Gould, C.
name: Wenisch, J.
name: Brunner, K.
name: Schmidt, G.
name: Molenkamp, L. W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use lithographically induced strain relaxation to periodically modulate the magnetic anisotropy in a single (Ga,Mn)As layer. This results in a lateral magnetoresistance device where two non-volatile magnetic states exist at zero external magnetic field with resistances resulting from the orientation of two lithographically defined regions in a single and contiguous layer.
description: 5 pages, 7 figures
Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths
Creators: name: Chachan, Yayaati
name: Dalba, Paul A.
name: Knutson, Heather A.
name: Fulton, Benjamin J.
name: Thorngren, Daniel
name: Beichman, Charles
name: Ciardi, David R.
name: Howard, Andrew W.
name: Van Zandt, Judah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The observed correlation between outer giant planets and inner super-Earths is emerging as an important constraint on planet formation theories. In this study we focus on Kepler-167, which is currently the only system known to contain both inner transiting super-Earths and a confirmed outer transiting gas giant companion beyond 1 au. Using long term radial velocity monitoring, we measure the mass of the gas giant Kepler-167e ($P=1071$ days) to be $1.01^{+0.16}_{-0.15}$ M$_{\rm J}$, thus confirming it as a Jupiter analog. We re-fit the $Kepler$ photometry to obtain updated radii for all four planets. Using a planetary structure model, we estimate that Kepler-167e contains $66\pm19$ M$_{\oplus}$ of solids and is significantly enriched in metals relative to its solar-metallicity host star. We use these new constraints to explore the broader question of how systems like Kepler-167 form in the pebble accretion framework for giant planet core formation. We utilize simple disk evolution models to demonstrate that more massive and metal-rich disks, which are the most favorable sites for giant planet formation, can also deliver enough solids to the inner disk to form systems of super-Earths. We use these same models to constrain the nature of Kepler-167's protoplanetary disk, and find that it likely contained $\gtrsim 300$ M$_{\oplus}$ of dust and was $\gtrsim 40$ au in size. These values overlap with the upper end of the observed dust mass and size distributions of Class 0 and I disks, and are also consistent with the observed occurrence rate of Jupiter analogs around sun-like stars.
description: accepted for publication in ApJ, 19 pages, 10 figures. Table 1 will be provided in MRT format upon publication
Blogues educativos: análise de conteúdo e factores de longevidade
Creators: name: Pais, Fátima
name: Vasconcelos, Sandra
name: Capitão, Susana
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: Partindo da análise de alguns blogues distinguidos em 2009 com o prémio edublogawards, no presente artigo procura-se compreender algumas das dinâmicas subjacentes a estes blogues, identificando-se as suas principais características e apontando alguns dos factores que estão na base da sua longevidade. Desenvolvendo uma análise correlacional e longitudinal, que permitiu comparar o primeiro trimestre de 2009 e 2011, seguiu-se uma abordagem mista que permitiu não só estudar o número de posts e comentários feitos neste período, mas também proceder a uma análise do seu conteúdo. A reflexão em torno dos dados obtidos permitiu encontrar padrões de regularidade e factores, sendo ainda apontados indícios para futuras investigações.
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
Coherence of resonant-tunneling transport in terahertz quantum-cascade lasers
Creators: name: Kumar, Sushil
name: Hu, Qing
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We develop simple density-matrix models to describe the role of coherence in resonant-tunneling (RT) transport of quantum-cascade lasers (QCLs). Specifically, we investigate the effects of coherent coupling between the lasing levels with other levels on the transport properties and gain spectra. In the first part of the paper, we use a three-level density-matrix model to obtain useful analytical expressions for current transport through the injector barrier in a QCL. An expression for the slope discontinuity in the current-voltage characteristics at the lasing threshold is derived. This value is shown to be a direct measure of the population inversion at threshold, and contradicts the previously held belief of it being indicative of ratio of the laser level lifetimes. In the second part of the paper, we use density matrices to compute the gain spectrum for a resonant-phonon terahertz QCL design. The large anticrossing of the doublet of lower radiative levels is reflected in a broad gain linewidth due to a coherent RT assisted depopulation process. At certain bias conditions, the gain spectrum exhibits double peaks which is supported by experimental observations.
description: 14 pages, 13 figures
A Literacia da Informação no YouTube™: análise à sua divulgação, visualização e avaliação
Creators: name: Bezerra, Anna Cecília S.
name: Kanitar, Fátima
name: Laranjeiro, Joanne B.
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: Com a crescente utilização das Tecnologias da Informação e Comunicação na recolha de informação para realizar trabalhos académicos, estudos (Weiler, 2005; Matusiak, 2006; Head, 2007; Eisenberg, 2008; Rempel & Davidson, 2008) indicam que os estudantes do ensino superior não possuem as competências necessárias neste domínio. Apesar dos estudantes manifestarem competências tecnológicas, estas não são aplicadas quando se trata da pesquisa, seleção e tratamento de informação. Neste trabalho é analisado um conjunto de vídeos publicados no YouTube sobre Literacia da Informação. Os procedimentos metodológicos para a recolha de dados caracterizaram-se pela definição de termos de pesquisa, critérios de inclusão/exclusão e pela análise numérica ao nível da divulgação, visualização e avaliação destes recursos, sendo esta última dimensão complementada com uma análise qualitativa dos comentários do utilizador. Na análise efectuada apresentam-se as competências mais divulgadas e visualizadas no YouTube. Através dos registos de “gosto/não gosto” e dos comentários publicados é efectuada uma análise à avaliação destes vídeos. Os resultados fornecem indicadores, relacionados com as necessidades ao nível da publicação de recursos de ensino e aprendizagem no domínio da competência de seleção da informação.
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
In a distinguishing spacetime the horismos relation generates the causal relation
Creators: name: Minguzzi, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is proved that in a distinguishing spacetime the horismos relation E^+=J^+\I^+ generates the causal relation J^+. In other words two causally related events are joined by a chain of horismotically related events, or again, the causal relation is the smallest transitive relation containing the horismos relation. The result is sharp in the sense that distinction can not be weakened to future or past distinction. Finally, it is proved that a spacetime in which the horismos relation generates the causal relation is necessarily non-total imprisoning.
description: 7 pages, Latex2e
The AGN fuelling/feedback cycle in nearby radio galaxies -- IV. Molecular gas conditions and jet-ISM interaction in NGC3100
Creators: name: Ruffa, I.
name: Prandoni, I.
name: Davis, T. A.
name: Laing, R. A.
name: Paladino, R.
name: Casasola, V.
name: Parma, P.
name: Bureau, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: This is the fourth paper of a series investigating the AGN fuelling/feedback processes in a sample of eleven nearby low-excitation radio galaxies (LERGs). In this paper we present follow-up Atacama Large Millimeter/submillimeter Array (ALMA) observations of one source, NGC3100, targeting the $^{12}$CO(1-0), $^{12}$CO(3-2), HCO$^{+}$(4-3), SiO(3-2) and HNCO(6-5) molecular transitions. $^{12}$CO(1-0) and $^{12}$CO(3-2) lines are nicely detected and complement our previous $^{12}$CO(2-1) data. By comparing the relative strength of these three CO transitions, we find extreme gas excitation conditions (i.e. $T_{\rm ex}\gtrsim50$ K) in regions that are spatially correlated with the radio lobes, supporting the case for a jet-ISM interaction. An accurate study of the CO kinematics demonstrates that, although the bulk of the gas is regularly rotating, two distinct non-rotational kinematic components can be identified in the inner gas regions: one can be associated to inflow/outflow streaming motions induced by a two-armed spiral perturbation; the second one is consistent with a jet-induced outflow with $v_{\rm max}\approx 200$ km s$^{-1}$ and $\dot{M}\lesssim 0.12$ M$_{\odot}$ yr$^{-1}$. These values indicate that the jet-CO coupling ongoing in NGC3100 is only mildly affecting the gas kinematics, as opposed to what expected from existing simulations and other observational studies of (sub-)kpc scale jet-cold gas interactions. HCO$^{+}$(4-3) emission is tentatively detected in a small area adjacent to the base of the northern radio lobe, possibly tracing a region of jet-induced gas compression. The SiO(3-2) and HNCO(6-5) shock tracers are undetected: this - along with the tentative HCO$^{+}$(4-3) detection - may be consistent with a deficiency of very dense (i.e. $n_{\rm crit} > 10^{6}$ cm$^{-3}$) cold gas in the central regions of NGC3100.
description: 20 pages, 11 figures, 6 tables. Accepted for publication in MNRAS
Loneliness, anxiousness, alcohol and marijuana use as predictors of Facebook/Instagram/general social media use
Creators: name: Vanhasbroeck, Niels
name: Urbanek, Lies
name: Vanpaemel, Wolf
name: Huybrechts, Liesl
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: alcohol use
subject: anxiousness
subject: loneliness
subject: marijuana use
subject: replication
subject: social media

description: We will perform a high-powered preregistered replication and extension of Clayton, Osborne, Miller and Oberle (2013). Our study examines the relationships between loneliness, anxiety, alcohol use, and marijuana use in the prediction of connections with others on the social networking site Facebook and Instagram, emotional attachment to Facebook and Instagram, relationship maintenance behavior to Facebook and Instagram, as well as general social media use.
Free fermions under adaptive quantum dynamics
Creators: name: Ravindranath, Vikram
name: Yang, Zhi-Cheng
name: Chen, Xiao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study free fermion systems under adaptive quantum dynamics consisting of unitary gates and projective measurements followed by corrective unitary operations. We further introduce a classical flag for each site, allowing for an active or inactive status which determines whether or not the unitary gates are allowed to apply. In this dynamics, the individual quantum trajectories exhibit a measurement-induced entanglement transition from critical to area-law scaling above a critical measurement rate, similar to previously studied models of free fermions under continuous monitoring. Furthermore, we find that the corrective unitary operations can steer the system into a state characterized by charge-density-wave order. Consequently, an additional phase transition occurs, which can be observed at both the level of the quantum trajectory and the quantum channel. We establish that the entanglement transition and the steering transition are fundamentally distinct. The latter transition belongs to the parity-conserving (PC) universality class, arising from the interplay between the inherent fermionic parity and classical labelling. We demonstrate both the entanglement and the steering transitions via efficient numerical simulations of free fermion systems, which confirm the PC universality class of the latter.
description: 10 pages, 9 figures; [v2] Updated references; [v3] Published version
title: Barrier heights, polarization switching, and electrical fatigue in Pb(Zr,Ti)O₃ ceramics with different electrodes
Creators: name: Chen, Feng
name: Schafranek, Robert
name: Wachau, André
name: Zhukov, Sergey
name: Glaum, Julia
name: Granzow, Torsten
name: Seggern, Heinz von
name: Klein, Andreas
Publisher: name: AIP Publishing
Year: 2021

description: The influence of Pt, tin-doped In2O₃, and RuO₂ electrodes on the electrical fatigue of bulk ceramic Pb(Zr,Ti)O₃ (PZT) has been studied. Schottky barrier heights at the ferroelectric/electrode interfaces vary by more than one electronvolt for different electrode materials and do not depend on crystallographic orientation of the interface. Despite different barrier heights, hysteresis loops of polarization, strain, permittivity, and piezoelectric constant and the switching kinetics are identical for all electrodes. A 20% reduction in polarization after 106 bipolar cycles is observed for all the samples. In contrast to PZT thin films, the loss of remanent polarization with bipolar switching cycles does not significantly depend on the electrode material.
Análise das potencialidades do iPad® visualizadas nos vídeos do YouTube™ no âmbito das Necessidades Educativas Especiais
Creators: name: Ramos, Adriana
name: Ferreira, Simone
name: Reis, Sofia
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: A disseminação da internet e, particularmente, das ferramentas de comunicação da Web 2.0, veio reforçar a criação de comunidades baseadas na partilha e na produção de conteúdos. A plataforma YouTube™ é um exemplo claro de partilha que mobiliza comunidades com interesses comuns. Os conteúdos produzidos pelos utilizadores, aí disponibilizados, constituem dados com grande potencial no campo da investigação. É neste contexto que se situa o presente estudo, o qual visa aferir as potencialidades do iPad® no âmbito das Necessidades Educativas Especiais, tendo por base o corpus latente existente na plataforma YouTube™. As opções metodológicas sustentam-se num paradigma qualitativo e assumem uma abordagem exploratória ao problema. A análise dos vídeos efetuada, com recurso ao software WebQDA, indicia que o iPad® tem potencial para aumentar o nível de autonomia e fomentar as aprendizagens dos sujeitos com Necessidades Educativas Especiais (NEE).
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)
Hot C-rich white dwarfs: testing the DB-DQ transition through pulsations
Creators: name: Córsico, A. H.
name: Romero, A. D.
name: Althaus, L. G.
name: García-Berro, E.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Hot DQ white dwarfs constitute a new class of white dwarf stars, uncovered recently within the framework of the SDSS project. Recently, three hot DQ white dwarfs have been reported to exhibit photometric variability with periods compatible with pulsation g-modes. Here, we present a nonadiabatic pulsation analysis of the recently discovered carbon-rich hot DQ white dwarf stars. One of our main aims is to test the convective-mixing picture for the origin of hot DQs through the pulsational properties. Our study relies on the full evolutionary models of hot DQ white dwarfs recently developed by Althaus et al. (2009), that consistently cover the whole evolution from the born-again stage to the white dwarf cooling track. Specifically, we present a stability analysis of white dwarf models from stages before the blue edge of the DBV instability strip until the domain of the hot DQ white dwarfs, including the transition DB --> hot DQ white dwarf. We found that at evolutionary phases in which the models are characterized by He-dominated atmospheres, they exhibit unstable $g$-mode pulsations typical of DBV stars, and when the models become DQ white dwarfs with carbon-dominated atmospheres, they continue being pulsationally unstable with similar characteristics than DB models, and in agreement with the periods detected in variable hot DQ white dwarfs. Our calculations provide strong support to the convective-mixing picture for the formation of hot DQs. In particular, our results point to the existence of pulsating DB white dwarfs with very thin He-rich envelopes, which after passing the DBV instability strip become variable hot DQ stars. The existence of these DB stars with very thin envelopes could be investigated through asteroseismology.
description: 10 pages, 10 figures. To be published in Astronomy & Astrophysics
Supplementary document for High peak-power 2.1-μm femtosecond Holmium amplifier at 100 kHz - 7363073.pdf
Creators: name: Suzuki, Anna
name: Kassai, Boldizsar
name: Wang, Yicheng
name: Omar, Alan
name: Löscher, Robin
name: Tomilov, Sergei
name: Hoffmann, Martin
name: Saraceno, Clara
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: Supplement 1
Scalable quantum neural networks by few quantum resources
Creators: name: Pastorello, Davide
name: Blanzieri, Enrico
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This paper focuses on the construction of a general parametric model that can be implemented executing multiple swap tests over few qubits and applying a suitable measurement protocol. The model turns out to be equivalent to a two-layer feedforward neural network which can be realized combining small quantum modules. The advantages and the perspectives of the proposed quantum method are discussed.
description: 14 pages
Design of a dual-excited synchronous machine and development of stabilization techniques
Creators: name: Dick, Eugene Peter
Publisher: name: University of British Columbia
Year: 2011

description: A dual-excited synchronous machine is designed and constructed. A power system is simulated using the machine and a medium length transmission line joined to the laboratory bus energized from B.C. Hydro which is considered the infinite bus. The effect of supplemental excitation control on power system stability is investigated. Feedback control is used in both the direct and quadrature fields. Torque angle, speed, power and terminal current signals are compared in their damping action. The response is also calculated from a ninth order mathematical model. It is found that the shaft speed is the best supplemental signal and that the direct and quadrature fields are equally effective in dynamically controlling the machine when operating near rated output.
Eigenphase preserving two-channel SUSY transformations
Creators: name: Pupasov, Andrey M
name: Samsonov, Boris F
name: Sparenberg, Jean-Marc
name: Baye, Daniel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We propose a new kind of supersymmetric (SUSY) transformation in the case of the two-channel scattering problem with equal thresholds, for partial waves of the same parity. This two-fold transformation is based on two imaginary factorization energies with opposite signs and with mutually conjugated factorization solutions. We call it an eigenphase preserving SUSY transformation as it relates two Hamiltonians, the scattering matrices of which have identical eigenphase shifts. In contrast to known phase-equivalent transformations, the mixing parameter is modified by the eigenphase preserving transformation.
description: 16 pages, 1 figure
Novos desafios na formação e investigação
Creators: name: Vieira, Rui Marques
name: Souza, Francislê Neri De
Publisher: name: Internet Latent Corpus Journal
Year: 2012

description: A sociedade atual trouxe novos desafios exigências à educação. Um deles prende-se com a evolução e funções das Tecnologias da informação e Comunicação – TIC e a sua utilização educativa, particularmente como contexto de formação e de investigação educativa. (...)
description: Internet Latent Corpus Journal, vol. 2 n.º 2 (2012)