cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Numerical and experimental investigation of macro-scale mixing applied to pulp fibre suspensions
Creators: name: Gómez, Clara
Publisher: name: University of British Columbia
Year: 2009

description: Effective mixing of pulp fibre suspensions is essential for many pulp and paper manufacturing processes. Pulp suspensions display non-Newtonian rheology and possess a yield stress, which complicates mixing. In order to improve our understanding of pulp mixing in agitated vessels, a series of studies was undertaken to assess the suitability of using computational fluid dynamics (CFD) to model these systems. CFD simulations for laboratory-scale and industrial-scale mixing chests were developed with the pulp suspensions treated as Bingham fluids. The computed flow fields were used to determine the dynamic response of the virtual mixers, which was then compared with experimental measurements providing very good agreement under conditions of moderate agitation. Comparison between calculations and measurements of torque and axial force was also good (relative average error of 12% to 24%). The simulation results provided insight into the mixing flow occurring within the systems, showing the formation of caverns around the impeller(s), the location of stagnation regions and the presence of channeling. However, the accuracy of these predictions was limited by the Bingham model used to describe the suspension's rheology and the uncertainty to which the suspension's yield stress could be measured. To assess the degree to which the approximated rheology contributed to the CFD results, the mixing of a model fluid having a well-defined rheology (Newtonian glycerin solution) was extensively investigated in a laboratory-scale vessel using a typical industrial geometry (rectangular chest, side-entering axial flow impeller). The flow fields were measured using particle image velocimetry (PIV) and compared with CFD computations for identical operating conditions. Good agreement was found (avg. 13.1% RMS deviation of local axial velocities) confirming that the approach used in the CFD model was adequate to calculate the complex mixing flow fields for a Newtonian fluid. These results encouraged further research on extending the combined CFD and PIV application on a system more closely representative of pulp suspension agitation. Calculations were then performed to select a suitable non-Newtonian model fluid and appropriate operating conditions to model pulp suspension mixing in the laboratory-scale vessel, with the dimensionless cavern diameter as the mixing criterion for conservation between the two systems.
Can we constrain structure growth from galaxy proper motions?
Creators: name: Duncan, Iain
name: Alonso, David
name: Slosar, Anže
name: Storey-Fisher, Kate
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Galaxy peculiar velocities can be used to trace the growth of structure on cosmological scales. In the radial direction, peculiar velocities cause redshift space distortions, an established cosmological probe, and can be measured individually in the presence of an independent distance indicator. In the transverse direction, peculiar velocities cause proper motions. In this case, however, the proper motions are too small to detect on a galaxy-by-galaxy basis for any realistic experiment in the foreseeable future, but could be detected statistically in cross-correlation with other tracers of the density fluctuations. We forecast the sensitivity for a detection of transverse peculiar velocities through the cross-correlation of a proper motion survey, modelled after existing extragalactic samples measured by Gaia, and an overlaping galaxy survey. In particular, we consider a low-redshift galaxy sample, and a higher-redshift quasar sample. We find that, while the expected cosmological signal is below the expected statistical uncertainties from current data using cross-correlations, the sensitivity can improve fast with future experiments, and the threshold for detection may not be too far away in the future. Quantitatively, we find that the signal-to-noise ratio for detection is in the range $S/N\sim0.3$, with most of the signal concentrated at low redshifts $z\lesssim0.3$. If detected, this signal is sensitive to the product of the expansion and growth rates at late times, and thus would constitute an independent observable, sensitive to both background expansion and large-scale density fluctuations.
description: 11 pages, 6 figures
Ανάλυση τρόπων παραγωγής περιφερικού ήχου με πρότυπο την ανθρώπινη ακοή
Creators: name: Μυλωνάς, Μάριος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Περιφερικός ήχος
Μοντέλο ανθρώπινης ακοής
Ανάπτυξη συστήματος
Surround audio
Human auditory model
System development

description: Η παρούσα εργασία επιχειρεί να αναπτύξει και να αξιολογήσει συστήματα παραγωγής περιφερικού ήχου. Δύο συστήματα αναπτύχθηκαν για τον σκοπό της εργασίας, ένα με την χρήση του λογισμικού RAVEN της Virtual Acoustics, και ένα με την γλώσσα προγραμματισμού υψηλού επιπέδου γενικής χρήσης, Python. Τα συστήματα αυτά αναπτύχθηκαν με βάση ηχογραφήσεις σημάτων και μελέτης της ακουστικής συμπεριφοράς ενός κλειστού χώρου που αποτελεί το δωμάτιο ηχογράφησης ενός στούντιο ηχογραφήσεων. Τα ίδια τα μοντέλα παράγουν στην έξοδό τους binaural ηχογραφήσεις δύο καναλιών, οι οποίες μετατράπηκαν σε πολυκάναλα αρχεία τύπου 5.1, ώστε να μπορούν να αναπαραχθούν από συστήματα αναπαραγωγής περιφερικού ήχου. Τα δύο συστήματα αυτά συγκρίθηκαν με δύο εμπορικά συστήματα παραγωγής περιφερικού ήχου, το μοντέλο παραγωγής ήχου σε 5.1 του προγράμματος Cubase Pro 12 της Steinberg και το σύστημα Dolby Atmos της Dolby Laboratories. Τα τέσσερα αυτά συστήματα αξιολογήθηκαν και συγκρίθηκαν μεταξύ τους, έχοντας ως είσοδο τα ίδια αρχεία ήχου. Η σύγκριση έγινε με έναν αλγόριθμο υλοποίησης εντοπισμού ηχητικής πηγής DOA (Direction Of Arrival) και επίσης, μέσω χρήσης φασματογραφημάτων για την σύγκριση της αντήχησης που παράγουν τα μοντέλα τα οποία αναπτύχθηκαν για τον σκοπό της παρούσας εργασίας.
description: The current thesis aims to develop and evaluate immersive audio production systems. Two systems were developed for this purpose, one in the software RAVEN by Virtual Acoustics and one in the high-level general-purpose programming language, Python. Those systems were developed based on the recordings of test signals and study of the acoustic behavior of an enclosed space, a live room of a recording studio. The models produce as an output two channel binaural audio files that are then upscaled to 5.1, so they could be reproduced by a surround audio reproduction system. Those systems were compared with two commercial surround audio production systems, the integrated 5.1 production systems in Cubase Pro 12 by Steinberg and the Dolby Atmos system by Dolby Laboratories. Those four systems were evaluated and compared with one another using a source location estimation algorithm, a DOA (Direction Of Arrival) evaluation algorithm, as well as by the use of spectrograms in order to evaluate the reverberation that the systems that were developed for this thesis produced.
description: Σε συνεργασία με: Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
Numerically studying the degeneracy problem in extreme finite-source microlensing events
Creators: name: Sajadian, Sedighe
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Most transit microlensing events due to very low-mass lens objects suffer from extreme finite-source effects. While modeling their light curves, there is a known continuous degeneracy between their relevant lensing parameters, i.e., the source angular radius normalized to the angular Einstein radius $ρ_{\star}$, the Einstein crossing time $t_{\rm E}$, the lens impact parameter $u_{0}$, the blending parameter, and the stellar apparent magnitude. In this work, I numerically study the origin of this degeneracy. I find that these light curves have 5 observational parameters (i.e., the baseline magnitude, the maximum deviation in the magnification factor, the Full Width at Half Maximum $\rm{FWHM}=2 t_{\rm{HM}}$, the deviation from top-hat model, the time of the maximum time-derivative of microlensing light curves $T_{\rm{max}}=t_{\rm E}\sqrt{ρ_{\star}^{2}-u_{0}^{2}}$). For extreme finite-source microlensing events due to uniform source stars we get $t_{\rm{HM}}\simeq T_{\rm{max}}$, and the deviation from the top-hat model tends to zero which both cause the known continuous degeneracy. When either $ρ_{\star}\lesssim10$ or the limb-darkening effect is considerable $t_{\rm{HM}}$, and $T_{\rm{max}}$ are two independent observational parameters. I use a numerical approach, i.e., Random Forests containing $100$-$120$ Decision Trees, to study how these observational parameters are efficient in yielding the lensing parameters. These machine learning models find the mentioned 5 lensing parameters for finite-source microlensing events from uniform, and limb-darkened source stars with the average $R^{2}$-scores of $0.87$, and $0.84$, respectively. $R^{2}$-score for evaluating the lens impact parameter gets worse on adding limb darkening, and for extracting the limb-darkening coefficient itself this score falls as low as $0.67$.
description: 10 pages, 6 figures
Fergusobia Currie 1937 (Christie 1941
Creators: name: Davies, Kerrie A.
name: Giblin-Davis, Robin M.
name: Ye, Weimin
name: Taylor, Gary S.
name: Thomas, W. Kelley
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Secernentea
Tylenchida
Fergusobiidae
Fergusobia

description: Fergusobia Currie 1937 (Christie 1941)
 Fergusobia Currie 1937. Type species: Anguillulina (Fergusobia) tumifaciens Currie, 1937, by original designation (type lost).
description: Published as part of Davies, Kerrie A., Giblin-Davis, Robin M., Ye, Weimin, Taylor, Gary S. & Thomas, W. Kelley, 2013, Nematodes from galls on Myrtaceae. V. Fergusobia from large multilocular shoot bud galls from Angophora and Eucalyptus in Australia, with descriptions of six new species, pp. 101-140 in Zootaxa 3741 (1) on page 107, DOI: 10.11646/zootaxa.3741.1.3, http://zenodo.org/record/221895
Towards Building Child-Centered Machine Learning Pipelines: Use Cases from K-12 and Higher-Education
Creators: name: Sabuncuoglu, Alpay
name: Besevli, Ceylan
name: Sezgin, T. Metin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Researchers and policy-makers have started creating frameworks and guidelines for building machine-learning (ML) pipelines with a human-centered lens. Machine Learning pipelines stand for all the necessary steps to develop ML systems (e.g., developing a predictive keyboard). On the other hand, a child-centered focus in developing ML systems has been recently gaining interest as children are becoming users of these products. These efforts dominantly focus on children's interaction with ML-based systems. However, from our experience, ML pipelines are yet to be adapted using a child-centered lens. In this paper, we list the questions we ask ourselves in adapting human-centered ML pipelines to child-centered ones. We also summarize two case studies of building end-to-end ML pipelines for children's products.
Solution To The Cosmic Rays Puzzle ?
Creators: name: Dado, Shlomo
name: Dar, Arnon
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent observations provide compelling evidence that the bulk of the high energy cosmic rays (CRs) and gamma-ray bursts (GRBs) are co-produced by highly relativistic jets of plasmoids of stellar matter. These jets are launched by fall back matter on newly born neutron stars and stellar black holes in core collapse of stripped envelope massive stars with or without an associated supernova. The electrons in the plasmoids produce GRB pulses mainly by inverse Compton scattering of photons on their path, while magnetic reflection of the charged particles produces the high energy cosmic rays.
Topologically Protected Quantum State Transfer in a Chiral Spin Liquid
Creators: name: Yao, Norman Y.
name: Laumann, Chris R.
name: Gorshkov, Alexey V.
name: Weimer, Hendrik
name: Jiang, Liang
name: Cirac, J. Ignacio
name: Zoller, Peter
name: Lukin, Mikhail D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Topology plays a central role in ensuring the robustness of a wide variety of physical phenomena. Notable examples range from the robust current carrying edge states associated with the quantum Hall and the quantum spin Hall effects to proposals involving topologically protected quantum memory and quantum logic operations. Here, we propose and analyze a topologically protected channel for the transfer of quantum states between remote quantum nodes. In our approach, state transfer is mediated by the edge mode of a chiral spin liquid. We demonstrate that the proposed method is intrinsically robust to realistic imperfections associated with disorder and decoherence. Possible experimental implementations and applications to the detection and characterization of spin liquid phases are discussed.
description: 14 pages, 7 figures
Prevalence of depression and cognitive impairment in older adults of north and south European countries from 2019 to 2022: a mini systematic review
Creators: name: Νταϊλάκης, Παναγιώτης Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Νοητική εξασθένηση
Κατάθλιψη
Βόρεια και Νότια Ευρώπη
Cognitive Impairment
Depression
North and South Europe

description: This systematic review aims to summarize the best-available evidence concerning the prevalence of cognitive impairment and depression in the northern and southern European countries from 2019 to 2022. A computerized literature research was executed, using a stepwise searching approach. PubMed, EBSCO and Scopus databases were searched for studies published from 2019 to 2022. Findings suggest that in the years 2019-2022 the prevalence of depression and cognitive impairment was higher in southern European countries than in northern European countries However, northern European countries had faster annual cognitive decline. A result that could be explained by the prevention strategies that each country is using, the Mediterranean diet adherence, lifestyle and the COVID-19 impact. The findings presented here contribute to a better understanding of the prevalence of cognitive impairment and depression in older adults of north and south Europe from the year 2019 which signaled the impact of COVID-19 situation. This may be a starting point for further research.
description: Ελληνική Περίληψη Αυτή η συστηματική ανασκόπηση στοχεύει να συνοψίσει τα καλύτερα διαθέσιμα στοιχεία σχετικά με τον επιπολασμό της νοητικής εξασθένησης και της κατάθλιψης στις χώρες της βόρειας και νότιας Ευρώπης από το 2019 έως το 2022. Πραγματοποιήθηκε ηλεκτρονική βιβλιογραφική έρευνα, χρησιμοποιώντας μια σταδιακή προσέγγιση αναζήτησης. Οι βάσεις δεδομένων PubMed, EBSCO και Scopus αναζητήθηκαν για μελέτες που δημοσιεύθηκαν από το 2019 έως το 2022. Τα ευρήματα υποδηλώνουν ότι τα έτη 2019-2022 ο επιπολασμός νοητικής εξασθένησης και της κατάθλιψης ήταν υψηλότερος στις χώρες της Νότιας Ευρώπης από ό,τι στις χώρες της Βόρειας Ευρώπης, ωστόσο, οι χώρες της Βόρειας Ευρώπης είχαν ταχύτερη ετήσια νοητική εξασθένηση. Ένα αποτέλεσμα που θα μπορούσε να εξηγηθεί από τις στρατηγικές πρόληψης που χρησιμοποιεί κάθε χώρα, την τήρηση της μεσογειακής διατροφής, τον τρόπο ζωής και τον αντίκτυπο του COVID-19. Τα ευρήματα που παρουσιάζονται εδώ συμβάλλουν στην καλύτερη κατανόηση του επιπολασμού της νοητικής εξασθένησης και της κατάθλιψης σε ηλικιωμένους ενήλικες της Βόρειας και Νότιας Ευρώπης από το έτος 2019 που σηματοδότησε τον αντίκτυπο της κατάστασης COVID-19. Αυτό μπορεί να είναι ένα σημείο εκκίνησης για περαιτέρω έρευνα.
Solar Particle Acceleration at Reconnecting 3D Null Points
Creators: name: Stanier, Adam J.
name: Browning, Philippa K.
name: Dalla, Silvia
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: The strong electric fields associated with magnetic reconnection in solar flares are a plausible mechanism to accelerate populations of high energy, non-thermal particles. One such reconnection scenario occurs at a 3D magnetic null point, where global plasma flows give rise to strong currents in the spine axis or fan plane. Aims: To understand the mechanism of charged particle energy gain in both the external drift region and the diffusion region associated with 3D magnetic reconnection. In doing so we evaluate the efficiency of resistive spine and fan models for particle acceleration, and find possible observables for each. Method: We use a full orbit test particle approach to study proton trajectories within electromagnetic fields that are exact solutions to the steady and incompressible magnetohydrodynamic equations. We study single particle trajectories and find energy spectra from many particle simulations. The scaling properties of the accelerated particles with respect to field and plasma parameters is investigated. Results: For fan reconnection, strong non-uniform electric drift streamlines can accelerate the bulk of the test particles. The highest energy gain is for particles that enter the current sheet, where an increasing "guide field" stabilises particles against ejection. The energy is only limited by the total electric potential energy difference across the fan current sheet. The spine model has both slow external electric drift speed and weak energy gain for particles reaching the current sheet. Conclusions: The electromagnetic fields of fan reconnection can accelerate protons to the high energies observed in solar flares, gaining up to 0.1 GeV for anomalous values of resistivity. However, the spine model, which gave a harder energy spectrum in the ideal case, is not an efficient accelerator after pressure constraints in the resistive model are included.
description: 15 pages, 14 figures. Submitted to Astronomy and Astrophysics
Fabrication of a 64-Pixel TES Microcalorimeter Array with Iron Absorbers Uniquely Designed for 14.4-keV Solar Axion Search
Creators: name: Yagi, Yuta
name: Hayashi, Tasuku
name: Tanaka, Keita
name: Miyagawa, Rikuta
name: Ota, Ryo
name: Yamasaki, Noriko Y.
name: Mitsuda, Kazuhisa
name: Yoshida, Nao
name: Saito, Mikiko
name: Homma, Takayuki
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: If a hypothetical elementary particle called an axion exists, to solve the strong CP problem, a 57Fe nucleus in the solar core could emit a 14.4-keV monochromatic axion through the M1 transition. If such axions are once more transformed into photons by a 57Fe absorber, a transition edge sensor (TES) X-ray microcalorimeter should be able to detect them efficiently. We have designed and fabricated a dedicated 64-pixel TES array with iron absorbers for the solar axion search. In order to decrease the effect of iron magnetization on spectroscopic performance, the iron absorber is placed next to the TES while maintaining a certain distance. A gold thermal transfer strap connects them. We have accomplished the electroplating of gold straps with high thermal conductivity. The residual resistivity ratio (RRR) was over 23, more than eight times higher than a previous evaporated strap. In addition, we successfully electroplated pure-iron films of more than a few micrometers in thickness for absorbers and a fabricated 64-pixel TES calorimeter structure.
description: 5 pages, 5 figures, published in IEEE Transactions on Applied Superconductivity on 8 March 2023
Multistep shell model in the complex energy plane
Creators: name: Xu, Z. X.
name: Qi, C.
name: Liotta, R. J.
name: Wyss, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We have adopted the multistep shell model in the complex energy plane to study nuclear excitations occurring in the continuum part of the spectrum. In this method one proceeds by solving the shell model equations in a successive manner. That is, in each step one constructs the building blocks to be used in future steps. We applied this formalism to analyze the unbound nuclei $^{12,13}$Li starting from the one-particle states in $^{10}$Li and two-particle states in $^{11}$Li. In the former case the excitations correspond to the motion of three particles partitioned as the product of a one-particle and two-particle systems. The ground state of $^{12}$Li is thus calculated to be an antibound (virtual) state. In the four-particle system $^{13}$Li the states can be constructed as the coupling of two correlated pairs. We found that there is no bound or antibound state in $^{13}$Li.
description: 10 pages, 2 table, 3 figures, Proceedings of the Conference on Advanced Many-Body and Statistical Methods in Mesoscopic Systems, Constanta, Romania, June 27th - July 2nd 2011. To appear in Journal of Physics: Conference Series
Tips To Avoid Developer Burnout Like a Pro
Creators: name: Ntui, Aniebiet Inyang
Publisher: name: Zenodo
Year: 2021
Subjects: subject: Career
subject: Developer
subject: Computer Software
subject: FOS: Computer and information sciences
subject: Computer Engineering

description: Are you properly handling the stress in your dev life right now? Being stressed out because you have pending code to write or not being able to stare at your IDE for longer than 10 minutes without tabbing out and browsing the Web — are both symptoms of developer burnout. In other words, you’ve spent so much of your energy coding that you no longer can stand it.This happens to all of us senior and junior devs alike. It’s the problem of having a job that sometimes is also a hobby. When that happens, you love coding so much that you spend nine hours working on it and then a few extra working on your personal projects.Don’t worry though — at least not too much — because there are ways to avoid burnout. You just have to understand what you’re going through first.
Spectro-timing analysis of Cygnus X-1 during a fast state transition
Creators: name: Boeck, Moritz
name: Grinberg, Victoria
name: Pottschmidt, Katja
name: Hanke, Manfred
name: Nowak, Michael A.
name: Markoff, Sera B.
name: Uttley, Phil
name: Rodriguez, Jerome
name: Pooley, Guy G.
name: Suchy, Slawomir
name: Rothschild, Richard E.
name: Wilms, Joern
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the analysis of two long, quasi-uninterrupted RXTE observations of Cygnus X-1 that span several days within a 10 d interval. The spectral characteristics during this observation cover the region where previous observations have shown the source to be most dynamic. Despite that the source behavior on time scales of hours and days is remarkably similar to that on year time scales. This includes a variety of spectral/temporal correlations that previously had only been observed over Cyg X-1's long-term evolution. Furthermore, we observe a full transition from a hard to a soft spectral state that occurs within less than 2.5 hours - shorter than previously reported for any other similar Cyg X-1 transition. We describe the spectra with a phenomenological model dominated by a broken power law, and we fit the X-ray variability power spectra with a combination of a cutoff power law and Lorentzian components. The spectral and timing properties are correlated: the power spectrum Lorentzian components have an energy-dependent amplitude, and their peak frequencies increase with photon spectral index. Averaged over 3.2-10 Hz, the time lag between the variability in the 4.5-5.7 keV and 9.5-15 keV bands increases with decreasing hardness when the variability is dominated by the Lorentzian components during the hard state. The lag is small when there is a large power law noise contribution, shortly after the transition to the soft state. Interestingly, the soft state not only shows the shortest lags, but also the longest lags when the spectrum is at its softest and faintest. We discuss our results in terms of emission models for black hole binaries.
description: 13 pages, 15 figures, accepted for publication in Astronomy and Astrophysics
The quark orbital angular momentum from Wigner distributions and light-cone wave functions
Creators: name: Lorce', C.
name: Pasquini, B.
name: Xiong, X.
name: Yuan, F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the quark orbital angular momentum of the nucleon in the absence of gauge-field degrees of freedom, by using the concept of the Wigner distribution and the light-cone wave functions of the Fock state expansion of the nucleon. The quark orbital angular momentum is obtained from the phase-space average of the orbital angular momentum operator weighted with the Wigner distribution of unpolarized quarks in a longitudinally polarized nucleon. We also derive the light-cone wave function representation of the orbital angular momentum. In particular, we perform an expansion in the nucleon Fock state space and decompose the orbital angular momentum into the $N$-parton state contributions. Explicit expressions are presented in terms of the light-cone wave functions of the three-quark Fock state. Numerical results for the up and down quark orbital angular momenta of the proton are shown in the light-cone constituent quark model and the light-cone chiral quark-soliton model.
description: 26 pages, 4 figures
Interplay between Superconductivity and Magnetism in Rb0.8Fe1.6Se2 under Pressure
Creators: name: Ksenofontov, Vadim
name: Medvedev, Sergey A.
name: Schoop, Leslie M.
name: Wortmann, Gerhard
name: Palasyuk, Taras
name: Tsurkan, Vladimir
name: Deisenhofer, Joachim
name: Loidl, Alois
name: Felser, Claudia
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: High-pressure magnetization, structural and 57Fe Mössbauer studies were performed on superconducting Rb0.8Fe1.6Se2.0 with Tc = 32.4 K. The superconducting transition temperature gradually decreases on increasing pressure up to 5.0 GPa followed by a marked step-like suppression of superconductivity near 6 GPa. No structural phase transition in the Fe vacancy-ordered superstructure is observed in synchrotron XRD studies up to 15.6 GPa, while the Mössbauer spectra above 5 GPa reveal the appearance of a new paramagnetic phase and significant changes in the magnetic and electronic properties of the dominant antiferromagnetic phase, coinciding with the disappearance of superconductivity. These findings underline the strong correlation between antiferromagnetic order and superconductivity in phase-separated AxFe2-x/2Se2 (A = K, Rb, Cs) superconductors.
Platenkamp, Jos D. M. and Schneider, Almut (eds.). 2019. Integrating Strangers in Society. Perspectives from Elsewhere. Cham: Palgrave Macmillan. 229 pp. Hb.: 96.29 €. ISBN: 9783030167028.
Creators: name: Rebolj, Anja
Publisher: name: Zenodo
Year: 2020

description: Book review
Rationality problems and conjectures of Milnor and Bloch-Kato
Creators: name: Asok, Aravind
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: We show how the techniques of Voevodsky's proof of the Milnor conjecture and the Voevodsky- Rost proof of its generalization the Bloch-Kato conjecture can be used to study counterexamples to the classical Lüroth problem. By generalizing a method due to Peyre, we produce for any prime number l and any integer n >= 2, a rationally connected, non-rational variety for which non-rationality is detected by a non-trivial degree n unramified étale cohomology class with l-torsion coefficients. When l = 2, the varieties that are constructed are furthermore unirational and non-rationality cannot be detected by a torsion unramified étale cohomology class of lower degree.
description: 15 pages; Revised and extended version of http://arxiv.org/abs/1001.4574 v2; Comments welcome!
Improved Privacy-Preserving PCA Using Optimized Homomorphic Matrix Multiplication
Creators: name: Ma, Xirong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Principal Component Analysis (PCA) is a pivotal technique widely utilized in the realms of machine learning and data analysis. It aims to reduce the dimensionality of a dataset while minimizing the loss of information. In recent years, there have been endeavors to utilize homomorphic encryption in privacy-preserving PCA algorithms for the secure cloud computing scenario. These approaches commonly employ a PCA routine known as PowerMethod, which takes the covariance matrix as input and generates an approximate eigenvector corresponding to the primary component of the dataset. However, their performance is constrained by the absence of an efficient homomorphic covariance matrix computation circuit and an accurate homomorphic vector normalization strategy in the PowerMethod algorithm. In this study, we propose a novel approach to privacy-preserving PCA that addresses these limitations, resulting in superior efficiency, accuracy, and scalability compared to previous approaches
Investigating the Effects of Finite Resolution on Observed Transverse Jet Profiles
Creators: name: Murphy, Eoin G.
name: Gabuzda, Denise C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Both the emission properties and evolution of Active Galactic Nuclei (AGN) radio jets are dependent on the magnetic fields that thread them. Faraday Rotation gradients are a very important way of investigating these magnetic fields, and can provide information on the orientation and structure of the magnetic field in the immediate vicinity of the jet; for example, a toroidal or helical field component should give rise to a systematic gradient in the observed Faraday rotation across the jet, as well as characteristic intensity and polarization profiles. However, real observed radio images have finite resolution, usually expressed via convolution with a Gaussian beam whose size corresponds to the central lobe of the point source response function. This will tend to blur transverse structure in the jet profile, raising the question of how well resolved a jet must be in the transverse direction in order to reliably detect transverse structure associated with a helical jet magnetic field. We present results of simulated intensity, polarization and Faraday rotation images designed to directly and empirically investigate the effect of finite resolution on observed transverse jet structures.
The State-of-the-Art in Air Pollution Monitoring and Forecasting Systems using IoT, Big Data, and Machine Learning
Creators: name: Gangwar, Amisha
name: Singh, Sudhakar
name: Mishra, Richa
name: Prakash, Shiv
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The quality of air is closely linked with the life quality of humans, plantations, and wildlife. It needs to be monitored and preserved continuously. Transportations, industries, construction sites, generators, fireworks, and waste burning have a major percentage in degrading the air quality. These sources are required to be used in a safe and controlled manner. Using traditional laboratory analysis or installing bulk and expensive models every few miles is no longer efficient. Smart devices are needed for collecting and analyzing air data. The quality of air depends on various factors, including location, traffic, and time. Recent researches are using machine learning algorithms, big data technologies, and the Internet of Things to propose a stable and efficient model for the stated purpose. This review paper focuses on studying and compiling recent research in this field and emphasizes the Data sources, Monitoring, and Forecasting models. The main objective of this paper is to provide the astuteness of the researches happening to improve the various aspects of air polluting models. Further, it casts light on the various research issues and challenges also.
description: 30 pages, 11 figures, Wireless Personal Communications. Wireless Pers Commun (2023)
Population genomics in species conservation : tools for the study of local adaptation and fisheries management in kokanee (Oncorhynchus nerka)
Creators: name: Kirk, Stephanie Lynn
Publisher: name: University of British Columbia
Year: 2019

description: The Okanagan Lake kokanee (Oncorhynchus nerka) population has experienced a dramatic decline in numbers since the late 1960’s, making it the focus of significant conservation efforts. Despite the decline, two sympatric ecotypes adapted to different reproductive environments continue to exist. This thesis aims to determine whether divergent selection is driving fine-scale genomic differentiation between the two ecotypes and explore whether the use of adaptive genetic markers for stock identification and population assessment would improve the accuracy and reduce the error associated with conventional kokanee fishery management. Genomic scans using expressed sequence tag-linked microsatellite markers identified 57 gene regions of adaptive significance, of which seven loci displayed outlier behaviour associated with local adaptation to different spawning environments. The utility of these outlier loci in genetics-based classifications of Okanagan Lake kokanee stocks is evaluated and the uncertainty surrounding the optimal class and number of genetic markers for differentiating kokanee ecotypes is addressed. Results from individual assignment and mixture composition analyses show outlier loci consistently perform better than all other classes of markers. The use of adaptive genetic markers for stock identification and assessment show great promise for improving the accuracy of fundamental abundance estimates and the results suggest a genetics-based approach to stock assessment may be a better alternative to achieving an effective and sustainable kokanee fishery in Okanagan Lake. This thesis presents the first study to directly infer signatures of selection that may be associated with observed variation between Okanagan Lake kokanee ecotypes and presents one of the first applications of population genomics to a natural population of conservation concern.
Working Paper 8: The impact of the Covid-19 Pandemic at the Slow Food Movement
Creators: name: Kalix Garcia, Thalita
Publisher: name: Food for Justice Working Paper Series
Year: 2023

description: The corona virus outburst was declared a global pandemic in March 2020, making many countries to go on lockdown in order to try to restrain it and avoid or dimmish the overwhelming of national health systems. As work and studies went online and social distancing became a safety rule, social movements also had to adapt themselves. Furthermore, food movements gained more relevance as one of the first concerns was to keep the food production and distribution worldwide despite the shutdowns. This paper aims to analyse the impacts of the Covid-19 pandemic in the Slow Food movement, how it changed the movement organization, agenda, and actions. It is based on empirical research in two countries: Brazil and Germany and it looks at three moments of the pandemic, from its first impact in 2020 till the adaptations and continuities in 2021 and 2022. This work relies on an on-site and virtual ethnography and is part of a broader investigation on the movement on both countries.
description: Food for Justice Working Paper Series, Vol. 8 (2023)
Unburned Material in the Ejecta of Type Ia Supernovae
Creators: name: Folatelli, Gastón
name: Phillips, M. M.
name: Morrell, Nidia
name: Tanaka, Masaomi
name: Maeda, Keiichi
name: Nomoto, Ken'ichi
name: Stritzinger, Maximilian
name: Burns, Christopher R.
name: Hamuy, Mario
name: Mazzali, Paolo
name: Boldt, Luis
name: Campillay, Abdo
name: Contreras, Carlos
name: Gonzalez, Sergio
name: Roth, Miguel
name: Salgado, Francisco
name: Freedman, W. L.
name: Madore, Barry F.
name: Persson, S. E.
name: Suntzeff, Nicholas B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (Abridged) The presence of unburned material in the ejecta of normal Type Ia supernovae (SNeIa) is investigated using early-time spectroscopy obtained by the CSP. The tell-tale signature of pristine material from a C+O white dwarf progenitor star is the presence of carbon. The most prominent carbon lines in optical spectra of SNeIa are due to C II. We find that at least 30% of the objects in the sample show an absorption at ~6300 AA which is attributed to C II 6580. An association to H_alpha is considered to be unlikely. These findings imply a larger incidence of carbon in SNeIa ejecta than previously noted. We show how observational biases and physical conditions may hide these C II lines, and account for the scarcity of previous carbon detections. This relatively large frequency of carbon detections has crucial implications on our understanding of the explosive process. The observations indicate that carbon is present merely ~1000 km s^-1 above the bulk of Si II. Spectral modeling shows the detections are consistent with a mass of carbon of 10^-3--10^-2 M_sun. This would imply substantial mixing, which may be related to asymmetries of the flame propagation or clumps of unburned material along the line of sight. However, the uniformity of the relation between C II and Si II velocities is not consistent with the latter scenario. The observational properties of SNeIa with and without carbon signatures are compared. A trend toward bluer color and lower luminosity is found for objects with carbon.
description: Submitted to ApJ on June 20, 2011. 19 pages, 19 figures, 4 tables. Minor changes applied after second referee report
Role of socio demographic variables and continuing medical education in explaining multi source feedback ratings and use of feedback by physicians
Creators: name: Lockyer, Jocelyn M.
Publisher: name: Graduate Studies
Year: 2002
Subjects: subject: AC1 .T484 2002 L635
subject: Physicians - Rating of - Canada
subject: Clinical competence - Canada - Evaluation

description: Bibliography: p. 95-108
An adaptive-binning method for generating constant-uncertainty/constant-significance light curves with Fermi-LAT data
Creators: name: Lott, B.
name: Escande, L.
name: Larsson, S.
name: Ballet, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a method enabling the creation of constant-uncertainty/constant-significance light curves with the data of the Fermi-Large Area Telescope (LAT). The adaptive-binning method enables more information to be encapsulated within the light curve than with the fixed-binning method. Although primarily developed for blazar studies, it can be applied to any sources. This method allows the starting and ending times of each interval to be calculated in a simple and quick way during a first step. The reported mean flux and spectral index (assuming the spectrum is a power-law distribution) in the interval are calculated via the standard LAT analysis during a second step. The absence of major caveats associated with this method has been established by means of Monte-Carlo simulations. We present the performance of this method in determining duty cycles as well as power-density spectra relative to the traditional fixed-binning method.
description: 17 pages, 13 figures, 5 tables. Submitted to A&A
Docosia melita Chandler & Gatt 2000
Creators: name: El Mouden, Mohamed Amin
name: Chandler, Peter J.
name: Saidoun, Imane
name: Driauach, Ouafaa
name: Belqat, Boutaïna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Docosia
Docosia melita

description: Docosia melita Chandler & Gatt, 2000
Material examined.
Morocco – Middle Atlas Region • 3 ♂♂; Vallée des oiseaux; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2415 • 1 ♂; Grotte Bouhayati; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2416 • 2 ♂♂; Oued Sidi Boulaâla; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2417 • 5 ♂♂; Oued Taourirt; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2418 • 1 ♂; Ruisseau Aïn Chabab; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2419 • 1 ♂; Aïn Admam; 22/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2420 • 1 ♂; Oued Lgziri; 23/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2421.
North African distribution.
Morocco (El Mouden et al. 2024).
description: Published as part of El Mouden, Mohamed Amin, Chandler, Peter J., Saidoun, Imane, Driauach, Ouafaa & Belqat, Boutaïna, 2025, A new species of Docosia Winnertz, 1864 and new records of fungus gnats (Diptera, Bolitophilidae, Keroplatidae and Mycetophilidae) from North Africa, pp. 349-379 in ZooKeys 1233 on pages 349-379, DOI: 10.3897/zookeys.1233.130502
A divergence-cleaning scheme for cosmological SPMHD simulations
Creators: name: Stasyszyn, F. A.
name: Dolag, K.
name: Beck, A. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In magnetohydrodynamics (MHD), the magnetic field is evolved by the induction equation and coupled to the gas dynamics by the Lorentz force. We perform numerical smoothed particle magnetohydrodynamics (Spmhd) simulations and study the influence of a numerical magnetic divergence. For instabilities arising from divergence B related errors, we find the hyperbolic/parabolic cleaning scheme suggested by Dedner et al. 2002 to give good results and prevent numerical artifacts from growing. Additionally, we demonstrate that certain current Spmhd implementations of magnetic field regularizations give rise to unphysical instabilities in long-time simulations. We also find this effect when employing Euler potentials (divergenceless by definition), which are not able to follow the winding-up process of magnetic field lines properly. Furthermore, we present cosmological simulations of galaxy cluster formation at extremely high resolution including the evolution of magnetic fields. We show synthetic Faraday rotation maps and derive structure functions to compare them with observations. Comparing all the simulations with and without divergence cleaning, we are able to confirm the results of previous simulations performed with the standard implementation of MHD in Spmhd at normal resolution. However, at extremely high resolution, a cleaning scheme is needed to prevent the growth of numerical errors at small scales.
description: 15 pages, 19 figures, submitted to MNRAS
The Nearest Isolated Member Of The Tw Hydrae Association Is A Giant Planet Analog
Creators: name: Kellogg, Kendra
name: Metchev, Stanimir
name: Gagne, Jonathan
name: Faherty, Jacqueline
Publisher: name: Zenodo
Year: 2016
Subjects: brown dwarf
young association
stars: individual (2MASS J11193254-1137466)

description: In a recent search for unusually red L and T dwarfs, we identified 2MASS J11193254-1137466 as a likely young L7 dwarf and potential member of the TW Hydrae association. We present spectra that confirm the youth of this object. We also measure a radial velocity of 8.5 ± 3.3 km/s that, together with the sky position, proper motion and photometric distance, results in a 92% probability of membership in the TW Hydrae association, with a calibrated field contamination probability of 0.0005% using the BANYAN II tool. Using the age of TW Hydrae and the luminosity of 2MASS J1119-1137, we estimate its mass to be 4.3—7.6 MJup.  It is the lowest-mass and nearest isolated member of TW Hydrae at a kinematic distance of 28.9 ± 3.6pc. It is also among the brightest isolated <10 MJup object discovered to date, second only to PSO J318.5-22 and at half the age.
description: {"references": ["Kellogg, K., Metchev, S., Geissler, K., et al. 2015, AJ, 150, 182", "Kellogg, K., Metchev, S., Gagn\u00e9, J., & Faherty, J. 2016, ApJL, 821, 15", "Faherty, J.,  Beletsky, Y., Burgasser, A. J., et al. 2014, ApJ, 790, 90", "Faherty, J.,  Reidel, A., Cruz, K., et al. 2016, arXiv.org, arXiv:1605.07927", "Schneider, A., Windsor, J., Cushing, M., et al. 2016, ApJ, 822, 1"]}
DynamicRead: Exploring Robust Gaze Interaction Methods for Reading on Handheld Mobile Devices under Dynamic Conditions
Creators: name: Lei, Yaxiong
name: Wang, Yuheng
name: Caslin, Tyler
name: Wisowaty, Alexander
name: Zhu, Xu
name: Khamis, Mohamed
name: Ye, Juan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences
subject: H.5.2; D.2.2; H.1.2; I.3.6

description: Enabling gaze interaction in real-time on handheld mobile devices has attracted significant attention in recent years. An increasing number of research projects have focused on sophisticated appearance-based deep learning models to enhance the precision of gaze estimation on smartphones. This inspires important research questions, including how the gaze can be used in a real-time application, and what type of gaze interaction methods are preferable under dynamic conditions in terms of both user acceptance and delivering reliable performance. To address these questions, we design four types of gaze scrolling techniques: three explicit technique based on Gaze Gesture, Dwell time, and Pursuit; and one implicit technique based on reading speed to support touch-free, page-scrolling on a reading application. We conduct a 20-participant user study under both sitting and walking settings and our results reveal that Gaze Gesture and Dwell time-based interfaces are more robust while walking and Gaze Gesture has achieved consistently good scores on usability while not causing high cognitive workload.
description: Accepted by ETRA 2023 as Full paper, and as journal paper in Proceedings of the ACM on Human-Computer Interaction