cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tango of celestial dancers: A sample of detached eclipsing binary systems containing g-mode pulsating components. A case study of KIC9850387
Creators: name: Sekaran, S.
name: Tkachenko, A.
name: Abdul-Masih, M.
name: Prsa, A.
name: Johnston, C.
name: Huber, D.
name: Murphy, S. J.
name: Banyard, G.
name: Howard, A. W.
name: Isaacson, H.
name: Bowman, D. M.
name: Aerts, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Eclipsing binary systems with components that pulsate in gravity modes ($g$ modes) allow for simultaneous and independent constraints of the chemical mixing profiles of stars. We aim to assemble a sample of $g$-mode pulsators in detached eclipsing binaries with the purpose of finding good candidates for future evolutionary and asteroseismic modelling. In addition, we present a case study of the eclipsing binary KIC9850387, identified as our most promising candidate. We selected all of the detached eclipsing binaries in the Kepler eclipsing binary catalogue and performed a visual inspection to determine the presence and density of $g$ modes, and the presence of $g$-mode period-spacing patterns in their frequency spectra. We then characterised our sample based on their $g$-mode pulsational parameters and binary and atmospheric parameters. A spectroscopic follow-up of KIC9850387 was then performed. We then performed spectral disentangling followed by atmospheric modelling and abundance analysis for the primary star. We utilised an iterative approach to simultaneously optimise the pulsational and eclipse models, and subsequently performed an analysis of the pressure- ($p$-) and $g$-mode pulsational frequencies. We compiled a sample of 93 Kepler eclipsing binary stars with $g$-mode pulsating components and identified clear $g$-mode period-spacing patterns in the frequency spectra of seven of these systems. We found that the $g$-mode pulsational parameters and the binary and atmospheric parameters of our sample are weakly correlated at best. We find that the eclipsing binary KIC9850387 is a double-lined spectroscopic binary in a near-circular orbit with an intermediate-mass primary, and a solar-like secondary. We find $\ell=1$ and $\ell=2$ period-spacing patterns in the frequency spectrum of KIC9850387 spanning more than ten radial orders each.
description: 27 pages, 14 figures, accepted for publication in A&A
Σχέσεις ανάμεσα σε δείκτες ατμοσφαιρικής κυκλοφορίας και στη βροχόπτωση στην ευρύτερη περιοχή της Κύπρου:
Creators: name: Ζίττης, Γεώργιος Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Τηλεσυνδέσεις
Βροχόπτωση
Κύπρος
Teleconnections
Precipitation
Cyprus

description: Είναι γνωστό ότι οι κυμάνσεις της γενικής κυκλοφορίας της ατμόσφαιρας ελέγχουν τη μεταβλητότητα του κλίματος σε τοπική, σε επίπεδο ημισφαιρίου και παγκόσμια κλίμακα. Σκοπός της εργασίας αυτής είναι να καθοριστούν οι σχέσεις ανάμεσα σε τρεις δείκτες τηλεσυνδέσεων και στη βροχόπτωση στην περιοχή της Κύπρου με τη χρήση στατιστικών μεθόδων. Οι αρνητικές τάσεις της βροχόπτωσης στην περιοχή της ανατολικής Μεσογείου και οι απαισιόδοξες προβολές του μελλοντικού κλίματος καθιστούν τη μελέτη της βροχόπτωσης ιδιαιτέρως σημαντική και απαραίτητη. Οι τρεις τύποι τηλεσυνδέσεων που χρησιμοποιήθηκαν στην μελέτη είναι η Βορειοατλαντική Κύμανση (ΝΑΟ), η Μεσογειακή Διακύμανση (ΜΟ) και η τηλεσύνδεση Βόρειας Θάλασσας- Κασπίας (ΝCP). Εκτός από τη βροχόπτωση εξετάστηκε και η σχέση των τριών κυμάνσεων με τρεις δείκτες ακραίας βροχόπτωσης, ο μέγιστος αριθμός συνεχόμενων ξηρών ημερών (CDD), to 95ο εκατοστημόριο βροχόπτωσης και η μέγιστη βροχόπτωση 5 ημερών (Px5d). Οι συντελεστές συσχέτισης του Pearson και του Spearman χρησιμοποιήθηκαν για να ποσοτικοποιηθούν οι συσχετίσεις ανάμεσα στους δείκτες τηλεσυνδέσεων, τη βροχόπτωση και τους δείκτες ακραίας βροχόπτωσης. Για να εξακριβωθεί η τυχόν σχέση βροχόπτωσης-δεικτών τηλεσυνδέσεων της ατμοσφαιρικής κυκλοφορίας εφαρμόστηκε και η μέθοδος της Κανονικής Ανάλυσης.
description: Oscillations of atmospheric circulation patterns are controlling climate variability on a local, hemispheric and global scale. Objective of this study is to determine the relations between three teleconection patterns and precipitation over the area of Cyprus using statistical methods. The last decades negative trends of precipitation over the Eastern Mediterranean and the pessimist projections of future climate are making the study of precipitation over the area very important and necessary. The three patterns used in this study are the North Atlantic Oscillation (NAO), the Mediterranean Oscillation (MO) and the North Sea-Caspian Pattern (NCP). Beside total precipitation, three extreme rainfall indices were examined. The maximum number of consecutive dry days (CDD), the 95th percentile of precipitation (Pq95) and the greatest 5-day total rainfall (Px5d). The product moment (Pearson) correlation coefficient as well as the rank (Spearman) correlation coefficient are used to quantify the relationships between the circulation modes and total precipitation and extreme precipitation (aforementioned indices). In order to verify these relations a Canonical Correlation Analysis was applied.
Coherent Dynamics in Quantum Emitters under Dichromatic Excitation
Creators: name: Koong, Z. X.
name: Scerri, E.
name: Rambach, M.
name: Cygorek, M.
name: Brotons-Gisbert, M.
name: Picard, R.
name: Ma, Y.
name: Park, S. I.
name: Song, J. D.
name: Gauger, E. M.
name: Gerardot, B. D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We characterize the coherent dynamics of a two-level quantum emitter driven by a pair of symmetrically-detuned phase-locked pulses. The promise of dichromatic excitation is to spectrally isolate the excitation laser from the quantum emission, enabling background-free photon extraction from the emitter. Paradoxically, we find that excitation is not possible without spectral overlap between the exciting pulse and the quantum emitter transition for ideal two-level systems due to cancellation of the accumulated pulse area. However, any additional interactions that interfere with cancellation of the accumulated pulse area may lead to a finite stationary population inversion. Our spectroscopic results of a solid-state two-level system show that while coupling to lattice vibrations helps to improve the inversion efficiency up to 50\% under symmetric driving, coherent population control and a larger amount of inversion are possible using asymmetric dichromatic excitation, which we achieve by adjusting the ratio of the intensities between the red and blue-detuned pulses. Our measured results, supported by simulations using a real-time path-integral method, offer a new perspective towards realising efficient, background-free photon generation and extraction.
description: 16 pages
Set-up of a reference wind-farm simulation database for testing of turbine and farm control strategies and load scenarios
Creators: name: Meyers, Johan
name: Vitsas, Athanasios
name: Sood, Ishaan
name: Munters, Wim
Publisher: name: Zenodo
Year: 2019

description: In the context of the TotalControl project, a new windfarm simulation database is set-up that covers different turbulence conditions, turbine arrangement patterns and wind directions. Simulations are based on large-eddy simulations (LES) of the atmospheric boundary layer in combination with aero-elastic nonlinear flexible multi-body representations of the turbines that are coupled to the LES using an actuator sector model. Two wind farms are considered: the first is the Lillgrund wind farm containing 48 Siemens SWT-2.3 turbines, the second is a virtual reference wind farm with 32 DTU 10 MW turbines.
title: การศึกษาความพร้อมใช้งานของกล้องจุลทรรศน์ และพฤติกรรมการใช้งานกล้องจุลทรรศน์ของนักศึกษาแพทย์ชั้นปีที่ 3 คณะแพทยศาสตร์ศิริราชพยาบาล
Creators: name: อภิภู วรภควัตกุล
name: สมคะเน สิทธิเสือ
name: ประเดิม เส็งเจริญ
Publisher: name: Mahidol University
publisherIdentifierScheme: ROR
Year: 2025
Subjects: ความพร้อมใช้งานของกล้องจุลทรรศน์
พฤติกรรมการใช้งานกล้องจุลทรรศน์
นักศึกษาแพทย์ชั้นปีที่ 3 ปี การศึกษา 2562

description: Mahidol R2R e-Journal, 12, 1, 91-98
Ο Μητροπολίτης Σερρών και Νιγρίτης Κωνσταντίνος Μεγγρέλης (1924-1961):
Creators: name: Νικολαϊδης, Σωτήριος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Μέριμνα για πρόσφυγες
Αποξηράνσεις, περίθαλψη, συνεταιρισμοί
Κατηγορία για δοσιλογισμό
Refugees' care
Drying of lakes, hospitalization, rural cooperative
Wrongly accused for cooperating with the Bulgarian occupation forces

description: Ο μητροπολίτης Σερρών και Νιγρίτης Κωνσταντίνος Μεγγρέλης γεννήθηκε το 1886 στη Σινώπη του Πόντου. Αποφοίτησε από τη θεολογική σχολή της Χάλκης το 1908 με βαθμό άριστα. Υπηρέτησε ως πρωτοσύγκελος στις μητροπόλεις Ηρακλείας και Χαλκηδόνος. Εξελέγη: το 1914 τιτουλάριος επίσκοπος Λεύκης, το1922 μητροπολίτης Ελευθερουπόλεως και το 1924 μητροπολίτης Σερρών και Νιγρίτης όπου παρέμεινε μέχρι το 1961 που παραιτήθηκε για λόγους υγείας. Δραστηριοποιήθηκε σε πολλούς τομείς: περίθαλψη προσφύγων, δημιουργία συσσιτίων, αποξήρανση ελών, εξυγίανση γεωργικών συνεταιρισμών, μόρφωση κληρικών. Παρουσίασε πλούσιο συγγραφικό έργο. Συκοφαντήθηκε για δοσιλογισμό προς τις δυνάμεις της βουλγαρικής κατοχής αλλά αθωώθηκε. Ωστόσο σκιάστηκε η υστεροφημία του. Πέθανε (13-10-1963) στη Θεσσαλονίκη και τάφηκε στις Σέρρες.
description: Metropolitan of Serres and Nigrita Konstantinos Megrelis was born in 1886 in Sinopi in the Black Sea. He graduated from the Ghalki School of Theology in 1908 with First Honours. He served as a Senior Archimandrite in the Diocese of Heraklea and Chalkidona. In 1914 he was elected an assistant bishop of Lefki. In 1922 he was elected bishop of Eleftheroupoli and in 1924 bishop of Serres. He remained in the throne until 1961 when he resigned due to health problems. He worked actively on several sectors of public life: he offered shelter to refuges, founded messes, contributed largely to the draining of swamps. He, also, helped with the reformation of agricultural associations and the education and training of the local priests. He was a prolific author of spiritual books. He was wrongly accuses of cooperating with the Bulgarian Occupation Forces. Although he was later acquitted his fame was never really restored. He died in Thessaloniki (13-10-1963) and was buried in Serres.
Remarks on generating realistic synthetic meteoroid orbits
Creators: name: Jopek, T. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Context. To identify the real associations of small bodies, we can use synthetic sets of orbits generated by various methods. These are not perfect methods, therefore the assessment of their quality is an essential task. Aims. In this study, we compared five methods for generating synthetic meteoroid orbits. Three of them (ME0, KD10, and KDns) had already been proposed in the literature, while two additional ones (ME1 and ME4) are new methods. Methods. As far as possible, the synthetic orbits were compared with the orbits of the observed meteoroids. For quantitative comparison, we applied a few tests: the chi-square distance and the nearest neighbor NN_N tests used in previous works, and one-dimensional chi-square and Kolmogorov-Smirnov (K-S) tests, as well as a two-dimensional K-S test implemented in this study. To estimate a general property of the orbital sample, we proposed the use of the entropy H_N of the data set based on the nearest neighbor distances. Finally, we did a cluster analysis of the synthetic orbits. We calculated and compared the values of the orbital similarity thresholds. Results. We showed that generating 'realistic' meteoroid orbits and testing their quality is a complex issue. An assessment of the quality of the generated orbits depends on the type of test applied, and it refers to the sample of the observed orbits used. Different tests give different assessments. However, in practice, the investigated methods produced similar results if they were applied correspondingly.
Correlation Driven Phonon Anomalies in Bulk FeSe
Creators: name: Khanal, Ghanashyam
name: Haule, Kristjan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the lattice dynamics of iron superconductor FeSe, and address the fundamental question of how important is proper description of fluctuating magnetic moments in metallic systems for phonon dispersion and phonon density of states. We show that Density Functional Theory (DFT)+ embedded Dynamical Mean-Field Theory (eDMFT) functional approach, which truly captures the fluctuating local moments, largely eliminates the deficiency of DFT for description of lattice dynamics in correlated metallic systems, and predicts phonon dispersion and phonon density of states in very good agreement with available X-ray data and nuclear inelastic scattering. This benchmark between eDMFT and experiment will be important for data science-driven material design, in which DFT is being replaced by beyond DFT methods.
description: 6 pages, 3 figures
The pre-shock gas of SN1006 from HST/ACS observations
Creators: name: Raymond, J. C.
name: Korreck, K. E.
name: Sedlacek, Q. C.
name: Blair, W. P.
name: Ghavamian, P.
name: Sankrit, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We derive the pre-shock density and scale length along the line of sight for the collisionless shock from a deep HST image that resolves the H alpha filament in SN1006 and updated model calculations. The very deep ACS high-resolution image of the Balmer line filament in the northwest (NW) quadrant shows that 0.25 < n_0 < le$ 0.4 cm-3 and that the scale along the line of sight is about 2 x 10^{18} cm, while bright features within the filament correspond to ripples with radii of curvature less than 1/10 that size. The derived densities are within the broad range of earlier density estimates, and they agree well with the ionization time scale derived from the Chandra X-ray spectrum of a region just behind the optical filament. This provides a test for widely used models of the X-ray emission from SNR shocks. The scale and amplitude of the ripples are consistent with expectations for a shock propagating though interstellar gas with ~ 20% density fluctuations on parsec scales as expected from studies of interstellar turbulence. One bulge in the filament corresponds to a knot of ejecta overtaking the blast wave, however. The interaction results from the rapid deceleration of the blast wave as it encounters an interstellar cloud.
description: 16 pages, 6 figures, to appear in ApJ
Identification of young nearby runaway stars based on Gaia data and the lithium test
Creators: name: Bischoff, R.
name: Mugrauer, M.
name: Torres, G.
name: Heyne, T.
name: Lux, O.
name: Munz, V.
name: Neuhäuser, R.
name: Hoffmann, S.
name: Trepanovski, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Young nearby runaway stars are suitable to search for their place of origin and possibly associated objects, for example neutron stars. Tetzlaff, Neuhäuser & Hohle (2011) selected young ($\le 50$ Myr) runaway star candidates from Hipparcos, for which they had estimated the ages from the location in the Hertzsprung-Russell diagram and evolutionary models. Here, we redetermine or constrain their young ages more precisely not only by using the new Gaia DR2 data, but also by measuring lithium, which is a youth indicator. For 308 stars, we took spectra to search for the strong resonance doublet of the lithium-7 isotope at 6708 $\unicode{xC5}$. The spectra were taken with the Échelle spectrograph FLECHAS at the University Observatory Jena between February 2015 and June 2018 and with TRES between April 2011 and June 2017 at the Fred L. Whipple Observatory. We found 208 stars with significant occurrence of lithium in their spectra, and five possess a possible age younger or about 50 Myr. Three of these targets are even closer than GJ 182, the nearest known runaway star at about 24 pc. Theses stars are young runaway stars suitable for further investigation of their origin from either a dynamical or supernova ejection.
description: 34 pages, 30 figures, 9 tables, accepted for publication in AN
The experience of nurses caring for young-middle aged patients dying of Cancer
Creators: name: Canning, Shelley
Publisher: name: University of British Columbia
Year: 2009

description: Research has addressed issues which face the nurse caring for patients dying of cancer. However, this research has focused primarily on the older adult population. As a result, nursing issues with respect to the 20-45 year old patient group have not been examined. This study intends to address this gap in the literature by describing the experience of oncology nurses caring for young-middle aged (ie. 20-45 years old) patients dying of cancer. The conceptual framework guiding this study recognizes that this patient group presents unique and difficult nursing challenges. It is believed that insights into these issues may help to prevent the stress and burnout which these nurses experience. A descriptive study design with convenience sampling was used. All of the fourteen subjects interviewed were registered nurses working in oncology who had cared for a young-middle aged patient within the past two years. Data analysis was concurrent with data collection, confirming the categories derived from the conceptual framework. The following areas were selected for analysis: issues in identifying with patients; issues in caring for families; and issues in shifting from a curative to a palliative focus. Study findings and analysis revealed that oncology nurses find nursing young-middle aged patients dying of cancer particularly difficult and stressful. Patient identification appeared to be an important factor in creating this stress. In addition, the nurses identified the dependent children and the parents of their patients as particularly challenging. Further, they felt that they lacked expertise in providing palliative care and perceived a lack of support in their work environment for the provision of this care. The nurses felt overwhelmed by the intensity of the sadness and grief they experienced when nursing the target patient group. They closely monitored the level of their patient involvement, often employing distancing strategies. However, the nurses also described the positive benefits and insights they gained from these patient relationships, despite the difficulties and grief they experienced.
Digital urban agriculture-implementing digital tools in the design phase
Creators: name: Chien, Szu-Cheng
name: An, Hui
name: Soh, Chew Beng
Publisher: name: Singapore Institute of Technology
Year: 2024

description: Urban agriculture, supported by digital tools, provides solutions to urban issues like food security, sustainability, and climate resilience, with the demand for these systems rising as cities grow. Tools like building information modeling, performance simulations, and microclimate controls enhance planning, design, and implementation in the design phase of digital urban agriculture. Such tools optimize the design of farm enclosures, boost yields, and reduce environmental impacts. This method addresses urban constraints regarding space, resources, and environment. It optimizes available space and climate recipes, adapts farming to urban contexts, and builds resilience against climate change. This chapter underlines the critical role of incorporating digital tools in the design phase of urban farming systems, emphasizing the potential of digital urban agriculture through a Singapore case study. These tools facilitate effective urban farming systems’ planning, design, and implementation by optimizing resource use, improving crop yields, and minimizing environmental impacts. Specifically, the simulations of daylighting, shadows, heat loads, and airflow were conducted to evaluate and enhance the growing climate during the design phase. This provides a solid scientific basis for refining urban agriculture strategies.
Combinatorial approach to spreading processes on networks
Creators: name: Mazzilli, Dario
name: Radicchi, Filippo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Stochastic spreading models defined on complex network topologies are used to mimic the diffusion of diseases, information, and opinions in real-world systems. Existing theoretical approaches to the characterization of the models in terms of microscopic configurations rely on some approximation of independence among dynamical variables, thus introducing a systematic bias in the prediction of the ground-truth dynamics. Here, we develop a combinatorial framework based on the approximation that spreading may occur only along the shortest paths connecting pairs of nodes. The approximation overestimates dynamical correlations among node states and leads to biased predictions. Systematic bias is, however, pointing in the opposite direction of existing approximations. We show that the combination of the two biased approaches generates predictions of the ground-truth dynamics that are more accurate than the ones given by the two approximations if used in isolation. We further take advantage of the combinatorial approximation to characterize theoretical properties of some inference problems, and show that the reconstruction of microscopic configurations is very sensitive to both the place where and the time when partial knowledge of the system is acquired.
description: 13 pages, 12 figures, 1 table
eRHIC - A precision electron-proton/ion collider facility at Brookhaven National Laboratory
Creators: name: Surrow, Bernd
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An electron-proton/ion collider facility (eRHIC) is under consideration at Brookhaven National Laboratory (BNL). Such a new facility will require the design and construction of a new optimized detector profiting from the experience gained from the H1 and ZEUS detectors operated at the HERA collider at DESY. The details of the design will be closely coupled to the design of the interaction region, and thus to the machine development work in general. An overview of the accelerator and detector design concepts will be provided.
description: 5 pages, 3 figures, Invited talk at the International Europhysics Conference on High-Energy Physics, Lisbon, Portugal, July 21-27, 2005
Evaluating the Impact of COVID-19 on Cyberbullying through Bayesian Trend Analysis
Creators: name: Karmakar, Sayar
name: Das, Sanchari
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: COVID-19's impact has surpassed from personal and global health to our social life. In terms of digital presence, it is speculated that during pandemic, there has been a significant rise in cyberbullying. In this paper, we have examined the hypothesis of whether cyberbullying and reporting of such incidents have increased in recent times. To evaluate the speculations, we collected cyberbullying related public tweets (N=454,046) posted between January 1st, 2020 -- June 7th, 2020. A simple visual frequentist analysis ignores serial correlation and does not depict changepoints as such. To address correlation and a relatively small number of time points, Bayesian estimation of the trends is proposed for the collected data via an autoregressive Poisson model. We show that this new Bayesian method detailed in this paper can clearly show the upward trend on cyberbullying-related tweets since mid-March 2020. However, this evidence itself does not signify a rise in cyberbullying but shows a correlation of the crisis with the discussion of such incidents by individuals. Our work emphasizes a critical issue of cyberbullying and how a global crisis impacts social media abuse and provides a trend analysis model that can be utilized for social media data analysis in general.
description: arXiv admin note: text overlap with arXiv:2008.13613
Planning to Chronicle
Creators: name: Rahmani, Hazhar
name: Shell, Dylan A.
name: O'Kane, Jason M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: An important class of applications entails a robot monitoring, scrutinizing, or recording the evolution of an uncertain time-extended process. This sort of situation leads an interesting family of planning problems in which the robot is limited in what it sees and must, thus, choose what to pay attention to. The distinguishing characteristic of this setting is that the robot has influence over what it captures via its sensors, but exercises no causal authority over the evolving process. As such, the robot's objective is to observe the underlying process and to produce a `chronicle' of occurrent events, subject to a goal specification of the sorts of event sequences that may be of interest. This paper examines variants of such problems when the robot aims to collect sets of observations to meet a rich specification of their sequential structure. We study this class of problems by modeling a stochastic process via a variant of a hidden Markov model, and specify the event sequences of interest as a regular language, developing a vocabulary of `mutators' that enable sophisticated requirements to be expressed. Under different suppositions about the information gleaned about the Markov model, we formulate and solve different planning problems. The core underlying idea is the construction of a product between the event model and a specification automaton. The paper reports and compares performance metrics by drawing on some small case studies analyzed in depth in simulation.
description: Algorithmic Foundations of Robotics (WAFR-XIV)
Trajectory and orbit of the unique carbonaceous meteorite Flensburg
Creators: name: Borovička, Jiří
name: Bettonvil, Felix
name: Baumgarten, Gerd
name: Strunk, Jörg
name: Hankey, Mike
name: Spurný, Pavel
name: Heinlein, Dieter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The C1-ungrouped carbonaceous chondrite Flensburg fell in Germany on September 12, 2019, in the daytime. We determined the atmospheric trajectory, velocity, and heliocentric orbit using one dedicated AllSky6 meteor camera and three casual video records of the bolide. It was found that the meteorite originated in the vicinity of the 5:2 resonance with Jupiter at heliocentric distance of 2.82 AU. When combined with the bolide energy reported by the U.S. Government sensors (USGS), the pre-atmospheric diameter of the meteoroid was estimated to 2 - 3 meters and the mass to 10,000 - 20,000 kg. The meteoroid fragmented heavily in the atmosphere at heights of 46 - 37 km, under dynamic pressures of 0.7 - 2 MPa. The recovery of just one meteorite suggests that only a very small part of the original mass reached the ground. The bolide velocity vector was compared with that reported by the USGS. There is good agreement in the radiant but the velocity value has been underestimated by the USGS by almost 1 km/s.
description: Preprint accepted for publication in Meteoritics & Planetary Science after a minor revision
Free-fall in a uniform gravitational field in non-commutative quantum mechanics
Creators: name: Castello-Branco, K. H. C.
name: Martins, A. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the free-fall of a quantum particle in the context of noncommutative quantum mechanics (NCQM). Assuming noncommutativity of the canonical type between the coordinates of a two-dimensional configuration space, we consider a neutral particle trapped in a gravitational well and exactly solve the energy eigenvalue problem. By resorting to experimental data from the GRANIT experiment, in which the first energy levels of freely falling quantum ultracold neutrons were determined, we impose an upper-bound on the noncommutativity parameter. We also investigate the time of flight of a quantum particle moving in a uniform gravitational field in NCQM. This is related to the weak equivalence principle. As we consider stationary, energy eigenstates, i.e., delocalized states, the time of flight must be measured by a quantum clock, suitably coupled to the particle. By considering the clock as a small perturbation, we solve the (stationary) scattering problem associated and show that the time of flight is equal to the classical result, when the measurement is made far from the turning point. This result is interpreted as an extension of the equivalence principle to the realm of NCQM.
description: 26 pages,titled shortned,main previous results unchanged,new material added,final version published in J. Math. Phys. 51, 102106 (2010)
Supporting evidence for the signature of the innermost stable circular orbit in Rossi X-ray data from 4U1636-536
Creators: name: Barret, Didier
name: Olive, Jean-Francois
name: Miller, M. Coleman
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Analysis of archival RXTE data on neutron stars binaries has shown that for several sources the quality factor (Q) of the lower kilohertz Quasi-Periodic Oscillations (QPO) drops sharply beyond a certain frequency. This is one possible signature of the approach to the general relativistic innermost stable circular orbit (ISCO), but the implications of such an interpretation for strong gravity and dense matter are important enough that it is essential to explore alternate explanations. In this spirit, Mendez has recently proposed that Q depends fundamentally on mass accretion rate (as measured by spectral hardness) rather than the frequency of the QPO. We test this hypothesis for 4U1636-536 by measuring precisely spectral colors simultaneously with the lower QPO frequency and Q after correction for the frequency drift, over a data set spanning eight years of RXTE observations. We find that in this source there is no correlation between Q and spectral hardness. In particular, no apparent changes in hardness are observed when Q reaches its maximum before dropping off. We perform a similar analysis on 4U1608-522; another source showing a sharp drop in the quality factor of its lower kHz QPO. We find that for this source, positive and negative correlations are observed between spectral hardness, frequency and Q. Consequently, if we are to search for a common explanation for the sharp drop in the quality factor seen in both sources, the spectral hardness is not a good candidate for the independent variable whereas the frequency remains. Therefore, we conclude that the ISCO explanation is viable for 4U1636-536, and thus possibly for others.
description: Accepted for publication in MNRAS, 7 pages, 8 figures, figure 3 in color
GLAST Large Area Telescope Multiwavelength Planning
Creators: name: Reimer, O.
name: Michelson, P. F.
name: Cameron, R. A.
name: Digel, S. W.
name: Thompson, D. J.
name: Wood, K. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Gamma-ray astrophysics depends in many ways on multiwavelength studies. The Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT) Collaboration has started multiwavelength planning well before the scheduled 2007 launch of the observatory. Some of the high-priority multiwavelength needs include: (1) availability of contemporaneous radio and X-ray timing of pulsars; (2) expansion of blazar catalogs, including redshift measurements; (3) improved observations of molecular clouds, especially at high galactic latitudes; (4) simultaneous broad-band blazar monitoring; (5) characterization of gamma-ray transients, including gamma ray bursts; (6) radio, optical, X-ray and TeV counterpart searches for reliable and effective sources identification and characterization. Several of these activities are needed to be in place before launch.
description: Comments: 4 pages, Accepted for publication in Astrophysics and Space Science, Proc. of "The Multi-Messenger Approach to High-Energy Gamma-ray Sources (Third Workshop on the Nature of Unidentified High-Energy Sources)", Barcelona, July 4-7, 2006
MAKTABGACHA TA'LIM YOSHDAGI BOLALARDA SOG'LOM TURMUSH TARZINI SHAKLLANTIRISHNING PEDAGOGIK IMKONIYATLARI
Creators: name: Guljaxon Kurbonturdiyeva Dovletovna, Buxoro, Turkiston Yangi Innovatsiyalar Universiteti, 1-bosqich magistranti, Maktabgacha ta'lim
Publisher: name: Zenodo
Year: 2024

description: Maktabgacha ta’lim pedagogikasi fani eng muhim asosiy pedagogik munosabatlar sabablarini aniqlaydi, uni pedagogik jarayonda o‘rganadi. Ushbu maqolada Maktabgacha ta'lim yoshdagi bolalarda sog'lom turmush tarzini shakllantirishning pedagogik imkoniyatlari haqida so`z yuritilgan.

Kalit so`zlar: Maktabgacha ta’lim pedagogikasi, pedagogika, o‘quv-tarbiya faoliyati, innovatsion texnologiya usullari
The Intermodulation Coefficient of an Inhomogeneous Superconductor
Creators: name: Kim, Kwangmoo
name: Stroud, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The high-T_c cuprate superconductors are now believed to be intrinsically inhomogeneous. We develop a theory to describe how this inhomogeneity affects the intermodulation coefficient of such a material. We show that the continuum equations describing intermodulation in a superconducting layer with spatially varying properties are formally equivalent to those describing an inhomogeneous dielectric with a nonzero cubic nonlinearity. Using this formal analogy, we calculate the effect of inhomogeneity on the intermodulation coefficient in a high-T_c material, using several assumptions about the topology of the layer, and some simple analytical approximations to treat the nonlinearity. For some topologies, we find that the intermodulation critical supercurrent density J_{IMD} is actually enhanced compared to a homogeneous medium, thereby possibly leading to more desirable material properties. We discuss this result in light of recent spatial mappings of the superconducting energy gap in BSCCO-2212.
description: 26 pages, 9 figures, accepted for publication in the Journal of Applied Physics
Αναλύοντας τις διαδρομές των κειμένων και τη διαπραγμάτευση ταυτοτήτων: Εθνογραφική μελέτη των πρακτικών γραμματισμού σε μια τοπική εφημερίδα:
Creators: name: Ντανόπουλος, Δημήτριος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Δημοσιογραφικός λόγος
Διαδρομές κειμένων
Κριτική Εθνογραφία
Κριτική Ανάλυση Λόγου
Στρατηγικές παραγωγής γραπτού λόγου
Media discourse
Routes of texts
Critical Ethnography
Critical Discourse Analysis
Writing strategies

description: Η παρούσα εργασία μελέτησε τις πρακτικές παραγωγής και επεξεργασίας δημοσιογραφικού λόγου σε μια τοπική εφημερίδα. Έγινε εθνογραφική μελέτη, κατά τη διάρκεια της οποίας καταγράφτηκαν οι σχέσεις αλληλεπίδρασης, εντός της κοινότητας, μεταξύ προσώπων και ομάδων, υπό τη μορφή ενός δυναμικού συστήματος (Activity System) που διαμόρφωσαν τις σύγχρονες διαδρομές (routes) διαφορετικών κειμένων. Οι διαδρομές αυτές και τα τελικά κείμενα που δημοσιεύτηκαν στην εφημερίδα απηχούσαν την ιδεολογία της κοινότητας και πραγματώνονταν με συγκεκριμένες στρατηγικές γραφής που ο δημοσιογράφος, ως μέλος της κοινότητας, είχε κατακτήσει και χρησιμοποιούσε σε μια διαδικασία αλληλεπίδρασης της ταυτότητάς του με την ταυτότητα της κοινότητας από την οποία επηρεαζόταν αλλά και συνδομούσε ταυτόχρονα. Για την ανάλυση των δεδομένων, αξιοποιήθηκαν η Κριτική Εθνογραφία, διευρύνσεις της Κριτικής Ανάλυσης Λόγου και βιβλιογραφία των Σπουδών για το Γραπτό Λόγο.
description: The present study studied the practices employed in a local newspaper during the production and processing of media discourse. An ethnographic research took place which aimed at recording the interactional relationships developing among people and groups of people within a shared community in the form of a dynamic system (Activity System) and how these relationships shaped the concurrent routes of different texts. These routes and the final texts published in the newspaper echoed the community ideology and were materialized by means of specific writing strategies which the journalist, being himself a member of the community, had attained and applied throughout an interactive process between his own identity and the community identity which he was influenced by and co-constructed at the same time. For the data analysis, Critical Ethnography, extensions of Critical Discourse Analysis and literature on Studies for Writing were capitalized.
The Red Day Star, The Women's Star and Venus: D(L/N)akota, Ojibwe and Other Indigenous Star Knowledge
Creators: name: Lee, Annette S.
name: Rock, Jim
name: Wilson, William
name: Gawboy, Carl
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics Education (physics.ed-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: In Ojibwe the Morning Star is called Ikew Anung, which means the Womens Star. In Lakota the same planet Venus is called Anpetu Luta, the Red Day Star. Bother cultures have rich and interesting understandings of Venus that relate to other Indigenous cultures throughout the world. Venus is so often related to the feminine because native peoples carefully watched the movement of the star and saw it in the east at sunrise for nine months and then in the west at sunset for the following nine months. Nine months is exactly the time for human gestation. Yet, tragically, the native star knowledge is disappearing as elders pass. The Native Skywatchers project focuses on understanding the Ojibwe and Dakota importance of this and other celestial connections. Working closely with a team of culture teachers and language experts we are building community around the native star knowledge.
description: arXiv admin note: text overlap with arXiv:2008.13214
The Self-Similarity of Shear-Dominated Viscous Stirring
Creators: name: Collins, Benjamin F.
name: Schlichting, Hilke E.
name: Sari, Re'em
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the growth of eccentricities of a population of particles with initially circular orbits around a central massive body. Successive encounters between pairs of particles increase the eccentricities in the disk on average. As long as the epicyclic motions of the particles are small compared to the shearing motion between Keplerian orbits, there is no preferred scale for the eccentricities. The simplification due to this self-similarity allows us to find an analytic form for the distribution function; full numerical integrations of a disk with 200 planetesimals verify our analytical self-similar distribution. The shape of this non-equilibrium profile is identical to the equilibrium profile of a shear-dominated population whose mutual excitations are balanced by dynamical friction or Epstein gas drag.
description: 8 pages, 2 figures
Virtual Corrections to Bremsstrahlung in High-Energy Collider Physics: LHC and e+ e- Colliders
Creators: name: Yost, Scott A.
name: Ward, B. F. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe radiative corrections to bremsstrahlung and their application to high energy collider physics, focusing on the applications to luminosity measurement, fermion pair production and radiative return. We review the status of one loop radiative corrections in BHLUMI and the KKMC, including cross checks with newer results developed independently for radiative return. We outline a YFS-exponentiated approach to the Drell-Yan process for LHC physics, including a discussion of the relevant radiative corrections.
description: Presented at RADCOR 2005: Application of Quantum Field Theory to Phenomenology, Shonan Village, Japan, Oct. 2-7, 2005 (5 pages, 6 EPS figures, uses espcrc2.sty)
Strong ultrafast demagnetization due to the intraband transitions
Creators: name: Murakami, Mitsuko
name: Zhang, G. P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Demagnetization in ferromagnetic transition metals driven by a femtosecond laser pulse is a fundamental problem in solid state physics, and its understanding is essential to the development of spintronics devices. Ab initio calculation of time-dependent magnetic moment in the velocity gauge so far has not been successful in reproducing the large amount of demagnetization observed in experiments. In this work, we propose a method to incorporate intraband transitions within the velocity gauge through a convective derivative in the crystal momentum space. Our results for transition-element bulk crystals (bcc Fe, hcp Co and fcc Ni) based on the time-dependent quantum Liouville equation show a dramatic enhancement in the amount of demagnetization after the inclusion of an intraband term, in agreement with experiments. We also find that the effect of intraband transitions to each ferromagnetic material is distinctly different because of their band structure and spin property differences. Our finding has a far-reaching impact on understanding of ultrafast demagnetization.
description: 24 pages and 6 figures. This is a draft and the final version can be found below
Interpretable Representation Learning for Speech and Audio Signals Based on Relevance Weighting
Creators: name: Agrawal, Purvi
name: Ganapathy, Sriram
Publisher: name: arXiv
Year: 2020
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The learning of interpretable representations from raw data presents significant challenges for time series data like speech. In this work, we propose a relevance weighting scheme that allows the interpretation of the speech representations during the forward propagation of the model itself. The relevance weighting is achieved using a sub-network approach that performs the task of feature selection. A relevance sub-network, applied on the output of first layer of a convolutional neural network model operating on raw speech signals, acts as an acoustic filterbank (FB) layer with relevance weighting. A similar relevance sub-network applied on the second convolutional layer performs modulation filterbank learning with relevance weighting. The full acoustic model consisting of relevance sub-networks, convolutional layers and feed-forward layers is trained for a speech recognition task on noisy and reverberant speech in the Aurora-4, CHiME-3 and VOiCES datasets. The proposed representation learning framework is also applied for the task of sound classification in the UrbanSound8K dataset. A detailed analysis of the relevance weights learned by the model reveals that the relevance weights capture information regarding the underlying speech/audio content. In addition, speech recognition and sound classification experiments reveal that the incorporation of relevance weighting in the neural network architecture improves the performance significantly.
description: arXiv admin note: text overlap with arXiv:2011.00721
title: ความคาดหวังของนิสิตแพทย์แผนจีน มหาวิทยาลัยพะเยาที่มีต่อแหล่งฝึกปฏิบัติงาน ด้านอาจารย์ประจำแหล่งฝึกปฏิบัติงาน ด้านความรู้ ด้านความสามารถ ด้านประสบการณ์ และด้านบุคลิกภาพ
Creators: name: สิริมา วงษ์พล
name: ทิฆัมพร เค้าโคน
Publisher: name: Mahidol University
publisherIdentifierScheme: ROR
Year: 2025
Subjects: ความคาดหวัง
นิสิตแพทย์แผนจีน
การฝึกปฏิบัติงานทางคลินิก
มหาวิทยาลัยพะเยา

description: Mahidol R2R e-Journal, 12, 1, 99-111
Detailed characterisation of the Gemma subgiant with EGGMiMoSA and PORTE-CLES
Creators: name: Farnir, Martin
Publisher: name: Zenodo
Year: 2024

description: The presence of mixed modes in the interior of evolved solar-like stars opens numerous avenues for their precise and detailed characterisation. Indeed, their discovery allowed us to disentangle core helium burning giants from hydrogen-shell burning ones (Bedding et al. 2011). This is the consequence of the fact that these modes propagate in most of the stellar interior – as opposed to modes in main-sequence solar-like stars, that propagate only in the outermost layers. We defined an approach, EGGMiMoSA (Extracting Guesses about Giants via Mixed-Mode Spectrum Adjustment, Farnir et al. 2021), that relies on the asymptotic description of mixed modes (Shibahashi 1979, Mosser et al. 2012, Takata 2016) and allows us to efficiently adjust the complex oscillation spectra of evolved stars and retrieve stringent seismic indicators, relevant to their structure. The present contribution consists in an exploratory work aiming at defining seismic indicators relevant to the structure of subgiants and at assessing their probing power. We consider the Gemma star (KIC11026764) as a benchmark. Indeed, this star has been observed for 48 months with the Kepler satellite. Consequently, Li et al. 2020a were able to precisely retrieve 45 individual oscillation modes. Taking advantage of the precise data, we explore the stellar parameters space over a grid of models encompassing the ones expected for Gemma (e.g. Li et al. 2020b) and determine the probing ability of defined EGGMiMoSA indicators and the structural information they hold. These indicators allow us to efficiently constrain the age, mass and radius of subgiants. This will be demonstrated via the adjustment of these newly defined seismic indicators in the case of Gemma. Accurately constraining the stellar structure of benchmark stars such as Gemma is crucial to the fulfillment of the PLATO mission requirements as subgiant stars are part of the core science program. This is also particularly relevant to future exoplanetary missions such as ARIEL that will benefit from PLATO’s seismology to meet their requirements on precise planetary parameters.