cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Near-field diffraction of protons by a nanostructured metallic grating under external electric field: Asymmetry and sidebands in Talbot self-imaging
Creators: name: Barman, Sushanta
name: Bhattacharjee, Sudeep
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Self-imaging in near-field diffraction is a practical application of coherent manipulation of matter waves in Talbot interferometry. In this work, near-field diffraction of protons by a nanostructured metallic grating under the influence of (a) uniform, (b) spatially modulated, and (c) temporally modulated electric fields are investigated. Time-domain simulations of two-dimensional Gaussian wave packets for protons are performed by solving the time-dependent Schrödinger's equation using the generalized finite difference time domain (GFDTD-Q) method for quantum systems. Effects of strength ($E_0$) and orientation ($θ$) of the uniform electric field on the diffraction properties, such as fringe pattern, intensity of the peaks, fringe shift, and visibility, are investigated. The results show that the Talbot fringes shift significantly in the transverse direction even for a small change in the applied electric field ($ΔE_0$ $=0.1$ V/m) and its orientation ($Δθ$ $=0.1^o$). The potential barriers arising from a spatially modulated electric field are observed to cause significant distortions in the Talbot patterns when the modulation length ($λ'$) is equal to the de Broglie wavelength ($λ_{dB}$). Sidebands are observed in the Talbot pattern due to the efficient transfer of energy from the oscillating field to the wave packet when the frequency of oscillation ($ω$) is of the order of $ω_0$ ($=2π/T_0$), where $T_0$ is the interaction time. This study will be helpful in uniform electric field-controlled precision metrology, developing a highly sensitive electric field sensor based on Talbot interference, and precisely aligning the matter wave optical setup. Furthermore, the sidebands in the Talbot fringe can be used as a precise tool as momentum splitter in matter wave interferometry.
description: 14 pages, 13 figures
Molecular Beam Epitaxy Growth of Transition Metal Dichalcogenide (Mo,Mn)Se$_2$ on 2D, 3D and polycrystalline substrates
Creators: name: Kucharek, Julia
name: Bożek, Rafał
name: Pacuski, Wojciech
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic doping of 2D materials such as Transition Metal Dichalcogenides is promising for the enhancement of magneto-optical properties, as it was previously observed for 3D diluted magnetic semiconductors. To maximize the effect of magnetic ions, they should be incorporated into the crystal lattice of 2D material rather than form separated precipitates. This work shows a study on incorporating magnetic manganese ions into the MoSe$_2$ monolayers using molecular beam epitaxy. We test growth on various substrates with very different properties: polycrystalline SiO$_2$ on Si, exfoliated 2D hexagonal Boron Nitride flakes (placed on SiO$_2$ / Si), monocrystalline sapphire, and exfoliated graphite (on tantalum foil). Although atomic force microscopy images indicate the presence of MnSe precipitates, but at the same time, various techniques reveal effects related to alloying MoSe$_2$ with Mn: Raman scattering and photoluminescence measurements show energy shift related to the presence of Mn, scanning transmission microscopy shows Mn induced partial transformation of 1H to 1T^\prime phase. Above effects evidence partial incorporation of Mn into the MoSe$_2$ layer.
description: 13 pages, 8 figures
EMBL Fellows' Career Service Handout: Career inventory
Creators: name: Coulthard-Graf, Rachel
name: Cabezas, Patricia
Publisher: name: EMBL
Year: 2024

description: A template you can use to collect information about your career. It helps you keep all the details you might want later for your CV, cover-letter, personal branding and job interviews in one place, and gives you an overview of your achievements to date.
Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD 163296
Creators: name: Yen, Hsi-Wei
name: Koch, Patrick M.
name: Liu, Hauyu Baobab
name: Puspitaningrum, Evaria
name: Hirano, Naomi
name: Lee, Chin-Fei
name: Takakuwa, Shigehisa
Publisher: name: arXiv
Year: 2016
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 introduce a new stacking method in Keplerian disks that (1) enhances signal-to-noise ratios (S/N) of detected molecular lines and (2) that makes visible otherwise undetectable weak lines. Our technique takes advantage of the Keplerian rotational velocity pattern. It aligns spectra according to their different centroid velocities at their different positions in a disk and stacks them. After aligning, the signals are accumulated in a narrower velocity range as compared to the original line width without alignment. Moreover, originally correlated noise becomes de-correlated. Stacked and aligned spectra, thus, have a higher S/N. We apply our method to ALMA archival data of DCN (3-2), DCO+ (3-2), N2D+ (3-2), and H2CO (3_0,3-2_0,2), (3_2,2-2_2,1), and (3_2,1-2_2,0) in the protoplanetary disk around HD 163296. As a result, (1) the S/N of the originally detected DCN (3-2), DCO+ (3-2), and H2CO (3_0,3-2_0,2) and N2D+ (3-2) lines are boosted by a factor of >4-5 at their spectral peaks, implying one order of magnitude shorter integration times to reach the original S/N; and (2) the previously undetectable spectra of the H2CO (3_2,2-2_2,1) and (3_2,1-2_2,0) lines are materialized at more than 3 sigma. These dramatically enhanced S/N allow us to measure intensity distributions in all lines with high significance. The principle of our method can not only be applied to Keplerian disks but also to any systems with ordered kinematic patterns.
description: 9 pages, 5 figures, accepted by ApJ, comment welcome
Extensive Characterization of Seismic Laws in Acoustic Emissions of Crumpled Plastic Sheets
Creators: name: Costa, Leandro S.
name: Lenzi, Ervin K.
name: Mendes, Renio S.
name: Ribeiro, Haroldo V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geophysics (physics.geo-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Statistical similarities between earthquakes and other systems that emit cracking noises have been explored in diverse contexts, ranging from materials science to financial and social systems. Such analogies give promise of a unified and universal theory for describing the complex responses of those systems. There are, however, very few attempts to simultaneously characterize the most fundamental seismic laws in such systems. Here we present a complete description of the Gutenberg-Richter law, the recurrence times, Omori's law, the productivity law, and Bath's law for the acoustic emissions that happen in the relaxation process of uncrumpling thin plastic sheets. Our results show that these laws also appear in this phenomenon, but (for most cases) with different parameters from those reported for earthquakes and fracture experiments. This study thus contributes to elucidate the parallel between seismic laws and cracking noises in uncrumpling processes, revealing striking qualitative similarities but also showing that these processes display unique features.
description: Accepted for publication in EPL
Habiter la maison numérique
Creators: name: Serrano, Gemma
Publisher: name: Ephata
Year: 2023

description: En étudiant les relations des humains avec ce qui les entoure nous affirmons dans ce texte que l’environnement numérique est un espace quotidien d’habitation que porte les traits du domestique: «tout espace vraiment habité porte l’essence de la maison» (Bachelard). Nous analyserons les traits de la maison à partir du langage scripturaire et chez Laudato si’ afin d’instruire la domesticité numérique: sol, architecture et habitabilité.
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
ViP-NeRF: Visibility Prior for Sparse Input Neural Radiance Fields
Creators: name: Somraj, Nagabhushan
name: Soundararajan, Rajiv
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: Neural radiance fields (NeRF) have achieved impressive performances in view synthesis by encoding neural representations of a scene. However, NeRFs require hundreds of images per scene to synthesize photo-realistic novel views. Training them on sparse input views leads to overfitting and incorrect scene depth estimation resulting in artifacts in the rendered novel views. Sparse input NeRFs were recently regularized by providing dense depth estimated from pre-trained networks as supervision, to achieve improved performance over sparse depth constraints. However, we find that such depth priors may be inaccurate due to generalization issues. Instead, we hypothesize that the visibility of pixels in different input views can be more reliably estimated to provide dense supervision. In this regard, we compute a visibility prior through the use of plane sweep volumes, which does not require any pre-training. By regularizing the NeRF training with the visibility prior, we successfully train the NeRF with few input views. We reformulate the NeRF to also directly output the visibility of a 3D point from a given viewpoint to reduce the training time with the visibility constraint. On multiple datasets, our model outperforms the competing sparse input NeRF models including those that use learned priors. The source code for our model can be found on our project page: https://nagabhushansn95.github.io/publications/2023/ViP-NeRF.html.
description: SIGGRAPH 2023
Disarticulation in poetry : intertextuality, gender, and the body in the Vergilian centos
Creators: name: Adams, Elizabeth Dorothy
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: subject: Latin poetry
subject: Cento
subject: Centos
subject: Vergil
subject: Virgil
subject: Ovid
subject: Seneca
subject: Christian poetry
subject: Gender
subject: Intertextuality
subject: Virgil--Criticism and interpretation
subject: Centos
subject: Ovid, 43 B.C.-17 A.D. or 18 A.D.--Criticism and interpretation
subject: Hippodamia--Criticism, Textual
subject: Intertextuality
subject: Christian poetry--History and criticism
subject: Christianity and literature
subject: Body image in literature
subject: Feminism in literature
subject: Seneca, Lucius Annaeus, approximately 4 B.C.-65 A.D.--Criticism and interpretation

description: This dissertation argues that the Vergilian Latin centos have much more intertextual and literary value than is imparted by their Vergilian hypotexts. In Chapter 1, I argue that the most common intertextual approach to reading centos, which prioritizes Vergilian readings, is insufficient. I suggest through a reading of the Iudicium Paridis that we should consider how centos change the meaning of Vergil’s texts, not just how Vergil changes the meaning of centos. I show through my analysis of the cento Hercules et Antaeus that we can see centos engaging with non-Vergilian texts in ways beyond allusion. In Chapter 2, I consider Ovid’s reputation as a proto-centonist. In his Metamorphoses, Ovid’s wordplay is deeply bound up in his depictions of violence, but this has so far gone underacknowledged in studies of the centos. I argue that we can read the centos Progne et Philomela, Narcissus, and Hippodamia as feminist texts that give voice to women silenced in mythology. In Chapter 3, I give a close reading of the cento Hippodamia. I suggest that its tragic elements, which have so far been overlooked, encourage reading it in terms of Senecan tragedy, which like Ovid also represents the physical violence of the narrative in the text. I argue that the cento Hippodamia subtly erases violence from the protagonist’s experience by embodying it within the construction of the text. In Chapter 4, I turn to the Christian centos. I argue that they, too, represent the text as a body, and use the form of the cento to emphasize the promise of resurrection. Throughout, I show that the Latin centos do not rely on Vergil to generate meaning or depth: the Latin centos take an active role in reshaping the myths they represent.
Visual Parameter Selection for Spatial Blind Source Separation
Creators: name: Piccolotto, Nikolaus
name: Bögl, Markus
name: Muehlmann, Christoph
name: Nordhausen, Klaus
name: Filzmoser, Peter
name: Miksch, Silvia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Analysis of spatial multivariate data, i.e., measurements at irregularly-spaced locations, is a challenging topic in visualization and statistics alike. Such data are integral to many domains, e.g., indicators of valuable minerals are measured for mine prospecting. Popular analysis methods, like PCA, often by design do not account for the spatial nature of the data. Thus they, together with their spatial variants, must be employed very carefully. Clearly, it is preferable to use methods that were specifically designed for such data, like spatial blind source separation (SBSS). However, SBSS requires two tuning parameters, which are themselves complex spatial objects. Setting these parameters involves navigating two large and interdependent parameter spaces, while also taking into account prior knowledge of the physical reality represented by the data. To support analysts in this process, we developed a visual analytics prototype. We evaluated it with experts in visualization, SBSS, and geochemistry. Our evaluations show that our interactive prototype allows to define complex and realistic parameter settings efficiently, which was so far impractical. Settings identified by a non-expert led to remarkable and surprising insights for a domain expert. Therefore, this paper presents important first steps to enable the use of a promising analysis method for spatial multivariate data.
Beyond ‘drinking occasions’: Examining complex changes in drinking practices during COVID-19
Creators: name: Caluzzi, Gabriel
name: Pennay, Amy
name: Laslett, Anne-Marie
name: Callinan, Sarah
name: Room, Robin
name: Dwyer, Robyn
Publisher: name: La Trobe
Year: 2022
Subjects: Uncategorized

description: Description not supplied
Discrete Wave-Packet Representation in Nuclear Matter Calculations
Creators: name: Müther, H.
name: Rubtsova, O. A.
name: Kukulin, V. I.
name: Pomerantsev, V. N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Lippmann-Schwinger equation for the nucleon-nucleon $t$-matrix as well as the corresponding Bethe-Goldstone equation to determine the Brueckner reaction matrix in nuclear matter are reformulated in terms of the resolvents for the total two-nucleon Hamiltonians defined in free space and in medium correspondingly. This allows to find solutions at many energies simultaneously by using the respective Hamiltonian matrix diagonalization in the stationary wave packet basis. Among other important advantages, this approach simplifies greatly the whole computation procedures both for coupled-channel $t$-matrix and the Brueckner reaction matrix. Therefore this principally novel scheme is expected to be especially useful for self-consistent nuclear matter calculations because it allows to accelerate in a high degree single-particle potential iterations. Furthermore the method provides direct access to the properties of possible two-nucleon bound states in the nuclear medium. The comparison between reaction matrices found via the numerical solution of the Bethe-Goldstone integral equation and the straightforward Hamiltonian diagonalization shows a high accuracy of the method suggested. The proposed fully discrete approach opens a new way to an accurate treatment of two- and three-particle correlations in nuclear matter on the basis of three-particle Bethe-Faddeev equation by an effective Hamiltonian diagonalization procedure.
Escarabajos y mariposas: El mundo es algo más que un problema a resolver
Creators: name: Martín, Maria Ángeles
name: Anguita, Pablo Martínez De
Publisher: name: Ephata
Year: 2023

description: En los años 70, a la vez que se empezaba a evidenciar la crisis ambiental, también comenzaba la crisis de la familia. Desde entonces los sesgos y prejuicios en algunos entornos sociales y científicos han desembocado en una radicalización de posturas que hacen difícil el diálogo entre las disciplinas que conforman el problema ambiental. La propuesta del Magisterio de la Iglesia, en los conceptos de ecología humana y ecología integral, necesitan desarrollarse evitando la abstracción o el reduccionismo para dar luz al dialogo interdisciplinar. El asombro, entendido como el inicio del conocimiento de la interioridad del hombre y de la realidad, se convierte en el camino unificador de entender la trascendencia de lo creado y entender así la relación entre las dos crisis, familiar y ambiental.
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
Catalyzing collaborations: Prescribed interactions at conferences determine team formation
Creators: name: Zajdela, Emma R.
name: Huynh, Kimberly
name: Wen, Andy T.
name: Feig, Andrew L.
name: Wiener, Richard J.
name: Abrams, Daniel M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37N99

description: Collaboration plays a key role in knowledge production. Here, we show that patterns of interaction during conferences can be used to predict who will subsequently form a new collaboration, even when interaction is prescribed rather than freely chosen. We introduce a novel longitudinal dataset tracking patterns of interaction among hundreds of scientists during multi-day conferences encompassing different scientific fields over the span of 5 years. We find that participants who formed new collaborations interacted 63% more on average than those who chose not to form new teams, and that those assigned to a higher interaction scenario had more than an eightfold increase in their odds of collaborating. We propose a simple mathematical framework for the process of team formation that incorporates this observation as well as the effect of memory beyond interaction time. The model accurately reproduces the collaborations formed across all conferences and outperforms seven other candidate models. This work not only suggests that encounters between individuals at conferences play an important role in shaping the future of science, but that these encounters can be designed to better catalyze collaborations.
description: 8 pages and 4 figures, main text; 8 pages and 3 figures supplementary information
Cosmological Distances And Hubble Tension In Einstein-Cartan Theory
Creators: name: Akhshabi, Siamak
name: Zamani, Saboura
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyze the measurement of cosmological distances in the presence of torsion in both Einstein-Cartan and Poincare gauge theory of gravity. Using the modified cosmological distance measurements, we use the observed time delays in gravitational lensing systems to determine the Hubble parameter. The results show the measured Hubble parameter from a lensing system can be less than its expected value in General Relativity for certain models of torsion and its associated density parameter. This can reduce the tension between late-time and early-universe measurements of the Hubble parameter, the so-called Hubble tension.
description: 16 pages, 10 figures. Some discussions and clarifications added. Accepted to GRG
Mobile Communication Signatures of Unemployment
Creators: name: Almaatouq, Abdullah
name: Prieto-Castrillo, Francisco
name: Pentland, Alex
Publisher: name: arXiv
Year: 2016
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: The mapping of populations socio-economic well-being is highly constrained by the logistics of censuses and surveys. Consequently, spatially detailed changes across scales of days, weeks, or months, or even year to year, are difficult to assess; thus the speed of which policies can be designed and evaluated is limited. However, recent studies have shown the value of mobile phone data as an enabling methodology for demographic modeling and measurement. In this work, we investigate whether indicators extracted from mobile phone usage can reveal information about the socio-economical status of microregions such as districts (i.e., average spatial resolution < 2.7km). For this we examine anonymized mobile phone metadata combined with beneficiaries records from unemployment benefit program. We find that aggregated activity, social, and mobility patterns strongly correlate with unemployment. Furthermore, we construct a simple model to produce accurate reconstruction of district level unemployment from their mobile communication patterns alone. Our results suggest that reliable and cost-effective economical indicators could be built based on passively collected and anonymized mobile phone data. With similar data being collected every day by telecommunication services across the world, survey-based methods of measuring community socioeconomic status could potentially be augmented or replaced by such passive sensing methods in the future.
Additional file 1 of Active acoustic telemetry reveals ontogenetic habitat-related variations in the coastal movement ecology of the white shark
Creators: name: Gennari, E.
name: Irion, D. T.
name: Cowley, P. D.
Publisher: name: figshare
Year: 2022
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Additional file 1. Visual assessment of pseudo-residuals obtained using the three-state HMM on the step lengths (top row) and turning angles (bottom row) data, obtained by manually tracking 19 white sharks in Mossel Bay.
Quelques défis du numérique pour une e-catéchèse
Creators: name: Amherdt, François-Xavier
Publisher: name: Ephata
Year: 2023

description: C’est à un véritable bouleversement dans nos manières de penser, de communiquer, de former, de transmettre la foi et d’évangéliser, que le déploiement des technologies du numérique continue de nous conduire. C’est une sorte d’«écosystème digital» qu’elles établissent. La catéchèse n’en est pas exempte. La contribution prend en compte sept défis principaux qu’une «e-catéchèse holistique» s’emploie à relever à l’ère des «écologies digitales», du fait des modifications de nos rapports aux savoirs, à la vérité, à la temporalité, à l’autorité, à l’expérience spirituelle, à la pédagogie d’initiation et à la communauté. Ce sont des formes de combinaisons hybrides entre catéchèses en présentiel et en ligne que nous sommes poussés de développer, car vu la loi de l’incarnation «synesthétique» au cœur de la foi chrétienne, le tout numérique demeure une illusion.
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
MC$^2$: Dynamical Analysis of the Merging Galaxy Cluster MACS J1149.5+2223
Creators: name: Golovich, Nathan
name: Dawson, William A.
name: Wittman, David
name: Ogrean, Georgiana A.
name: van Weeren, Reinout J.
name: Bonafede, Annalisa
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of the merging cluster MACS J1149.5+2223 using archival imaging from Subaru/Suprime-Cam and multi-object spectroscopy from Keck/DEIMOS and Gemini/GMOS. We employ two and three dimensional substructure tests and determine that MACS J1149.5+2223 is composed of two separate mergers between three subclusters occurring $\sim$1 Gyr apart. The primary merger gives rise to elongated X-ray morphology and a radio relic in the southeast. The brightest cluster galaxy is a member of the northern subcluster of the primary merger. This subcluster is very massive (16.7$^{+\text{1.25}}_{-\text{1.60}}\times\text{10}^{\text{14}}$ M$_{\odot}$). The southern subcluster is also very massive (10.8$^{+\text{3.37}}_{-\text{3.54}}\times\text{10}^{\text{14}}$ M$_{\odot}$), yet it lacks an associated X-ray surface brightness peak, and it has been unidentified previously despite the detailed study of this \emph{Frontier Field} cluster. A secondary merger is occurring in the north along the line of sight with a third, less massive, subcluster (1.20$^{+\text{0.19}}_{-\text{0.34}}\times\text{10}^{\text{14}}$ M$_{\odot}$). We perform a Monte Carlo dynamical analysis on the main merger and estimate a collision speed at pericenter of 2770$^{+\text{610}}_{-\text{310}}$ km s$^{-\text{1}}$. We show the merger to be returning from apocenter with core passage occurring 1.16$^{+\text{0.50}}_{-\text{0.25}}$ Gyr before the observed state. We identify the line of sight merging subcluster in a strong lensing analysis in the literature and show that it is likely bound to MACS J1149 despite having reached an extreme collision velocity of $\sim$4000 km s$^{-\text{1}}$.
description: 17 pages, 12 figures
Macroscopic Hyperpolarization Enhanced with Quantum Optimal Control
Creators: name: Marshall, Alastair
name: Reisser, Thomas
name: Rembold, Phila
name: Müller, Christoph
name: Scheuer, Jochen
name: Gierse, Martin
name: Eichhorn, Tim
name: Steiner, Jakob M.
name: Hautle, Patrick
name: Calarco, Tommaso
name: Jelezko, Fedor
name: Plenio, Martin B.
name: Montangero, Simone
name: Schwartz, Ilai
name: Müller, Matthias M.
name: Neumann, Philipp
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Hyperpolarization of nuclear spins enhances nuclear magnetic resonance signals, which play a key role for imaging and spectroscopy in the natural and life sciences. This signal amplification unlocks previously inaccessible techniques, such as metabolic imaging of cancer cells. In this work, electron spins from the photoexcited triplet state of pentacene-doped naphthalene crystals are used to polarize surrounding protons. As existing strategies are rendered less effective by experimental constraints, they are replaced with optimal control pulses designed with RedCRAB. In contrast to previous optimal control approaches, which consider an average single nucleus, this closed-loop optimization is macroscopic. A 28% improvement in signal and 15% faster polarization rate is observed. Additionally, a strategy called Autonomously-optimized Repeated Linear Sweep (ARISE) is introduced to efficiently tailor existing hyperpolarization sequences in the presence of experimental uncertainty to enhance their performance. ARISE is expected to be broadly applicable in many experimental settings.
description: 15 pages, 9 figures
Boosted Ensembles of Qubit and Continuous Variable Quantum Support Vector Machines for B Meson Flavour Tagging
Creators: name: West, Maxwell T.
name: Sevior, Martin
name: Usman, Muhammad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The recent physical realisation of quantum computers with dozens to hundreds of noisy qubits has given birth to an intense search for useful applications of their unique capabilities. One area that has received particular attention is quantum machine learning (QML), the study of machine learning algorithms running natively on quantum computers. Such algorithms have begun to be applied to data intensive problems in particle physics, driven by the expected increased capacity for pattern recognition of quantum computers. In this work we develop and apply QML methods to B meson flavour tagging, an important component of experiments in particle physics which probe heavy quark mixing and CP violation in order to obtain a better understanding of the matter-antimatter asymmetry observed in the universe. We simulate boosted ensembles of quantum support vector machines (QSVMs) based on both conventional qubit-based and continuous variable architectures, attaining effective tagging efficiencies of 28.0% and 29.2% respectively, comparable with the leading published result of 30.0% using classical machine learning algorithms. The ensemble nature of our classifier is of particular importance, doubling the effective tagging efficiency of a single QSVM, which we find to be highly prone to overfitting. These results are obtained despite the strong constraint of working with QSVM architectures that are classically simulable, and we find evidence that continuous variable QSVMs beyond the classically simulable regime may be able to realise even higher performance, surpassing the reported classical results, when sufficiently powerful quantum hardware is developed to execute them.
description: 10 pages, 8 figures
Thomaz, Luís Filipe. Ucrânia: as lições da História e outros estudos sobre o Oriente Cristão.
Creators: name: Campos, Domingos Tavares
Publisher: name: Ephata
Year: 2023

description: Ucrânia: as lições da História e outros estudos sobre o Oriente Cristão é a mais recente obra de Luís Filipe Thomaz, nome conhecido da historiografia religiosa em Portugal. Ao contrário daquilo que o título poderia indiciar, embora o título possa chamar a atenção para o tema ucraniano, que é estudado de uma perspetiva histórica, visando explicar o cisma eclesiástico que nessas terras grassa desde 2018, o livro lida com uma panóplia de temáticas pertinentes à Europa de Leste, assim como a história das diferentes denominações cristãs presentes no mundo oriental. No geral, o livro afigura-se como um conjunto de diferentes estudos, notas e adendas que vêm dar a conhecer o mundo do Cristianismo oriental que, em Portugal, se afigura como (quase) desconhecido, naquilo que é o culminar de décadas de estudos do historiador português, agora compilados e anotados.
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling
Creators: name: Manjarres, Jalil Varela
name: Nikolic, Branislav K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: One of the cornerstone effects in spintronics is spin pumping by dynamical magnetization that is steadily precessing (around, e.g., the $z$-axis) with frequency $ω_0$, due to absorption of low-power microwaves of frequency $ω_0$ under the resonance conditions and in the absence of any applied bias voltage. The two-decades-old "standard model" of this effect, based on the scattering theory of adiabatic quantum pumping, predicts that component $I^{S_z}$ of spin current vector $\big( I^{S_x}(t),I^{S_y}(t),I^{S_z} \big) \propto ω_0$ is time-independent while $I^{S_x}(t)$ and $I^{S_y}(t)$ oscillate harmonically in time with a single frequency $ω_0$; whereas pumped charge current is zero $I \equiv 0$ in the same adiabatic $\propto ω_0$ limit. Here we employ more general than "standard model" approaches, time-dependent nonequilibrium Green's function (NEGF) and Floquet-NEGF, to predict unforeseen features of spin pumping -- precessing localized magnetic moments within ferromagnetic metal (FM) or antiferromagnetic metal (AFM), whose conduction electrons are exposed to spin-orbit coupling (SOC) of either intrinsic or proximity origin, will pump both spin $I^{S_α}(t)$ and charge $I(t)$ currents. All four of these functions harmonically oscillate in time at both even an odd integer multiples $Nω_0$ of the driving frequency $ω_0$. The cutoff order of such high-harmonics increases with SOC strength, reaching $N_\mathrm{max} \simeq 11$ in the chosen-for-demonstration one-dimensional FM or AFM models. Higher cutoff $N_\mathrm{max} \simeq 25$ can be achieved in realistic two-dimensional (2D) FM models defined on the honeycomb lattice, where we provide prescription on how to realize them using 2D magnets and their heterostructures.
description: 9 pages, 5 figures, thoroughly revised; supplemental movie (and accompanying PDF) available from https://wiki.physics.udel.edu/qttg/Publications; see also related Comment arXiv:2212.06895
Presença cristã no metaverso: perspectivas e desafios pastorais a partir do estudo de caso do LagoVerso
Creators: name: Silva, Aline Amaro Da
name: Neto, Marcus Túlio Oliveira
Publisher: name: Ephata
Year: 2023

description: A rede digital desde sua criação tem sido um espaço de reflexão e prática da fé, portanto, um lugar teológico e pastoral. A pesquisa busca identificar os desafios e oportunidades para a ação pastoral no metaverso, através de um estudo de caso do LagoVerso, primeira igreja cristã brasileira nessa ecologia digital. O artigo analisa as características desta ambiência e verifica suas potencialidades como uma das novas ágoras onde o Evangelho pode ser comunicado. A pesquisa utilizou para desenvolver o estudo de caso, além do método de observação participante de dois cultos, uma entrevista em profundidade com o desenvolvedor do projeto. Assim como a experiência da rede afeta nossa vivência e hábitos espirituais, a experiência de fé impacta o desenvolvimento no ecossistema comunicativo digital. A partir da presença e das práticas da Igreja Batista da Lagoinha neste ambiente, busca-se levantar questões importantes para a «evangelização digital».
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
Introduction to finite $W$-algebras
Creators: name: Artamonov, D. V.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Representation Theory (math.RT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: These are notes of lectures given at UN Encuentro 2016 at the Colombia National University. We begin with the definition of infinite $W$-algebras. Then we explain the motivation for the definition if finite $W$-algebras. Then we present basic facts about the structure and representations of finite $W$-algebras. In these lectures we follow the historical development of the subject.
description: 63 pages
NeRSemble: Multi-view Radiance Field Reconstruction of Human Heads
Creators: name: Kirschstein, Tobias
name: Qian, Shenhan
name: Giebenhain, Simon
name: Walter, Tim
name: Nießner, Matthias
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We focus on reconstructing high-fidelity radiance fields of human heads, capturing their animations over time, and synthesizing re-renderings from novel viewpoints at arbitrary time steps. To this end, we propose a new multi-view capture setup composed of 16 calibrated machine vision cameras that record time-synchronized images at 7.1 MP resolution and 73 frames per second. With our setup, we collect a new dataset of over 4700 high-resolution, high-framerate sequences of more than 220 human heads, from which we introduce a new human head reconstruction benchmark. The recorded sequences cover a wide range of facial dynamics, including head motions, natural expressions, emotions, and spoken language. In order to reconstruct high-fidelity human heads, we propose Dynamic Neural Radiance Fields using Hash Ensembles (NeRSemble). We represent scene dynamics by combining a deformation field and an ensemble of 3D multi-resolution hash encodings. The deformation field allows for precise modeling of simple scene movements, while the ensemble of hash encodings helps to represent complex dynamics. As a result, we obtain radiance field representations of human heads that capture motion over time and facilitate re-rendering of arbitrary novel viewpoints. In a series of experiments, we explore the design choices of our method and demonstrate that our approach outperforms state-of-the-art dynamic radiance field approaches by a significant margin.
description: Siggraph 2023, Project Page: https://tobias-kirschstein.github.io/nersemble/ , Video: https://youtu.be/a-OAWqBzldU
A high resolution HI study towards the supernova remnant Puppis A and its environments
Creators: name: Reynoso, E. M.
name: Cichowolski, S.
name: Walsh, A. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We observed the supernova remnant (SNR) Puppis A in the 21 cm line with the Australia Telescope Compact Array with the aim of determining the systemic velocity and, hence, the corresponding kinematic distance. For the compact, background sources in the field, we obtain absorption spectra by applying two methods: (a) subtracting profiles on- and off-source towards continuum emission, and (b) filtering short spacial frequencies in the Fourier plane to remove large scale emission. One of the brightest features to the East of the shell of Puppis A was found to be a background source, probably extragalactic. Removing the contribution from this and the previously known unrelated sources, the systemic velocity of Puppis A turns out to be limited between 8 and 12 km s$^{-1}$, which places this source at a distance of 1.3 $\pm$ 0.3 kpc. From the combined images that include both single dish and interferometric data, we analyze the distribution of the interstellar hydrogen. We suggest that an ellipsoidal ring at $v \sim $+8 km s$^{-1}$ could be the relic of a bubble blown by the progenitor of Puppis A, provided the distance is $\lesssim$ 1.2 kpc. The main consequences of the new systemic velocity and distance as compared with previous publications ($v =$ +16 km s$^{-1}$ and $d = $2.2 kpc) are the absence of a dense interacting cloud to the East to explain the morphology, and the decrease of the shell size and the neutron star velocity, which are now in better agreement with statistical values.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society
Pastoral onlife: uma perspectiva ecológica e integral da comunicação da fé
Creators: name: Sbardelotto, Moisés
Publisher: name: Ephata
Year: 2023

description: A (con)fusão entre os conceitos de real e de virtual gera mal-entendidos e provoca inúmeros problemas para a prática pastoral cristã na atual cultura digital. Emerge, assim, a necessidade de ir além e de superar tais dicotomias e dualismos, em busca de uma comunicação integral nos novos ecossistemas comunicacionais contemporâneos. Para isso, a partir de pesquisa bibliográfica e reflexão ensaística, problematizaremos neste texto, primeiramente, a relação entre real e virtual, para que a realidade material do digital não seja compreendida apenas como algo meramente fictício. Em seguida, a partir da perspectiva da ecologia das mídias e de uma comunicação integral, analisaremos alguns dados referentes à pegada ecológica e sociocultural deixada pelo digital no mundo de hoje, para evidenciar sua materialidade. A fim de reconhecer as complexas interdependências entre os vários ambientes de vida que compõem a experiência contemporânea, apontaremos, então, para a importância de ir além das dicotomias e dos dualismos (por exemplo, entre online e offline), dando primazia às inter-relações e refletindo sobre a emergência da conectividade digital como uma verdadeira dimensão existencial, a partir do neologismo onlife, proposto por Luciano Floridi.
description: Ephata, Vol 5 No 1 (2023): Ecologias Digitais
Additional file 1 of The development and education of a workforce in childhood cancer services in low- and middle-income countries: a scoping review protocol
Creators: name: Cayrol, Julie
name: Ilbawi, André
name: Sullivan, Michael
name: Gray, Amy
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Developmental Biology
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Supplementary file 1. Sample database search strategy (Ovid Medline).
Topological data analysis and clustering
Creators: name: Panagopoulos, Dimitrios
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Topology (math.AT)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: I.5.3
subject: 55-01, 68T10

description: Clustering is one of the most common tasks of Machine Learning. In this paper we examine how ideas from topology can be used to improve clustering techniques.
description: This article is intended to be a chapter for a book
Additional file 2 of The development and education of a workforce in childhood cancer services in low- and middle-income countries: a scoping review protocol
Creators: name: Cayrol, Julie
name: Ilbawi, André
name: Sullivan, Michael
name: Gray, Amy
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Developmental Biology
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Additional file 2: Supplementary file 2. Data extraction form for Scoping Review.
Interaction of $\langle a \rangle$ prismatic screw dislocations with the $α-β$ interface side face in $α-β$ Ti alloys
Creators: name: Rida, Ali
name: Rao, Satish I.
name: El-Awady, Jaafar A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Slip transmission across $α-β$ interfaces is of great significance in understanding the strength of $α-β$ Ti alloys for aerospace applications. Molecular statics (MS) and molecular dynamics (MD) simulations were conducted to investigate the mechanisms of slip transmission of $\langle a \rangle$ prismatic screw dislocations across the $α-β$ interface side face. In these simulations, the $α$ phase consisted of pure HCP Ti whereas the $β$ phase was modeled as Ti$_{60}$Nb$_{40}$ BCC random alloy using a Ti-Nb interatomic potential. Firstly, the misfit dislocations structure on the $α-β$ interface side face has been characterized from MS simulations. This predicted dislocation structure is in good agreement with experimental observations in Ti-alloys. Secondly, MD simulations of the interaction of $[a_1]$, $[a_2]$, and $[a_3]$ prismatic screw dislocations with the interface side face in an $α-β$ bi-crystal were performed at different temperatures. A distinct barrier of the interface side face to different types of dislocation transmission was found. The origin of this anisotropy in the slip transmission is due to the relative misalignment of the slip systems between the $α$ and the $β$ phases from the Burgers orientation relationship. Finally, the mechanisms of slip transmission of each dislocation type were analyzed in a detailed atomistic description and compared to experimental observations.
Data-driven assessment of arch vortices in simplified urban flows
Creators: name: Martínez-Sánchez, Álvaro
name: Lazpita, Eneko
name: Corrochano, Adrián
name: Clainche, Soledad Le
name: Hoyas, Sergio
name: Vinuesa, Ricardo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Understanding flow structures in urban areas is widely recognized as a challenging concern due to its effect on urban development, air quality, and pollutant dispersion. In this study, state-of-the-art data-driven methods for modal analysis of simplified urban flows are used to study the dominant flow processes in these environments. Higher order dynamic mode decomposition (HODMD), a highly-efficient method to analyze turbulent flows, is used together with traditional techniques such as proper-orthogonal decomposition (POD) to analyze high-fidelity simulation data of a simplified urban environment. Furthermore, the spatio-temporal Koopman decomposition (STKD) will be applied to the temporal modes obtained with HODMD to perform spatial analysis. The flow interaction within the canopy influences the flow structures, particularly the arch vortex. The latter is a vortical structure generally found downstream of wall-mounted obstacles, which is generated as a consequence of flow separation. Therefore, the main objective of the present study is to characterize the mechanisms that promote these phenomena in urban areas with different geometries. Remarkably, among all the vortical structures identified by the HODMD algorithm, low- and high-frequency modes are classified according to their relation with the arch vortex. They are referred to as vortex-generator and vortex-breaker modes, respectively. This classification implies that one of the processes driving the formation and destruction of major vortical structures in between the buildings is the interaction between low- and high-frequency structures. The high energy revealed by the POD for the vortex-breaker modes points to this destruction process as the mechanism driving the flow dynamics.
Targeted influence maximization in complex networks
Creators: name: Zhang, Renquan
name: Wang, Xiaolin
name: Pei, Sen
Publisher: name: arXiv
Year: 2022
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Many real-world applications based on spreading processes in complex networks aim to deliver information to specific target nodes. However, it remains challenging to optimally select a set of spreaders to initiate the spreading process. In this paper, we study the targeted influence maximization problem using a susceptible-infected-recovered (SIR) model as an example. Formulated as a combinatorial optimization, the objective is to identify a given number of spreaders that can maximize the influence over target nodes while minimize the influence over non-target nodes. To find a practical solution to this optimization problem, we develop a theoretical framework based on a message passing process and perform a stability analysis on the equilibrium solution using non-backtracking (NB) matrices. We propose that the spreaders can be selected by imposing optimal perturbation on the equilibrium solution for the subgraph consisting of the target nodes and their multi-step nearest neighbors while avoiding such perturbation on the complement graph that excludes target nodes from the original network. We further introduce a metric, termed targeted collective influence, for each node to identify influential spreaders for targeted spreading processes. The proposed method, validated in both synthetic and real-world networks, outperforms other competing heuristic approaches. Our results provide a framework for analyzing the targeted influence maximization problem and a practical method to identify spreaders in real-world applications.
description: 13 pages,10 figures