cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Developing Learner Profiles: A corpus-based study of tense and aspect use by young EFL learners
Creators: name: Ντουβής, Ζαφείριος Στυλιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: σώματα μαθητικών κειμένων
χρόνος και ρηματική όψη
αγγλική ως ξένη γλώσσα
learner corpora
tense and aspect
English as a foreign language

description: Ο σκοπός αυτής της μελέτης, η οποία είναι βασισμένη σε σώματα κειμένων, είναι να εξερευνήσει και να συγκρίνει δύο σώματα μαθητικών κειμένων στην αγγλική γλώσσα που αποτελούνται από γραπτά κείμενα μικρών μαθητών που μαθαίνουν την αγγλική ως ξένη γλώσσα. Οι συμμετέχοντες στη μελέτη είναι μαθητές σε δύο διαδοχικές τάξεις σε ένα δημόσιο δημοτικό σχολείο στην Ελλάδα. Το ενδιαφέρον της σύγκρισης αυτής εστιάζεται στη χρήση των χρόνων και ρηματικών όψεων σε δύο σημαντικά στάδια της πορείας εκμάθησης τους της αγγλικής ως ξένης γλώσσας και ενώ η διαγλώσσα τους βρίσκεται σε κατάσταση συνεχούς μεταβολής καθώς νέα γλωσσικά στοιχεία προστίθενται σε αυτή. Η διατριβή, συγκεκριμένα, έχει ως θέμα το εύρος των ρηματικών τύπων και τη συχνότητα με την οποία αυτοί εμφανίζονται στα δύο σώματα κειμένων και έμφαση δίνεται στις κατηγορίες χρόνων (παροντικού και παρελθοντικού) και ρηματικών όψεων (progressive και perfective) που χρησιμοποιούν οι μαθητές και πώς αυτό το πεδίο γνώσης τους εξελίσσεται καθώς βελτιώνεται το επίπεδο γλωσσομάθειάς τους. Τα αποτελέσματα της ανάλυσης εξετάζονται και αξιολογούνται σύμφωνα με τα επίπεδα γλωσσομάθειας Α1 ως Γ2, όπως αυτά ορίζονται από το Κοινό Ευρωπαϊκό Πλαίσιο Αναφοράς για τις Γλώσσες (CEFR)
description: The purpose of this corpus-based study is to explore and compare two non-native learner corpora composed of the writing of young learners of English as a Foreign Language (EFL). The participants in the study are students in two adjacent grades in a state primary school in Greece. The focus of this comparison between the two learner corpora is on the use of tense and aspect, at two important stages of the learners’ EFL learning process when their interlanguage is in a state of flux, constantly developing as new linguistic features are added to it. This paper is concerned with the range of verb forms and their frequency distribution in the two corpora and emphasis is placed on exploring the tensed verb phrases that the EFL learners use, including verb phrases marked for aspect. The aim of the learner data analysis is to investigate how the learners’ awareness of the present and past tenses, as well as the progressive and perfect aspects, develops as their level of linguistic proficiency improves. The results of the analysis are discussed and evaluated in relation to the Reference Language Descriptions (RLDs) for English, developed by the English Profile Programme, and the proficiency bands - A1 to C2 - of the Common European Framework of Reference for Languages (CEFR)
$ϕ$-meson lepto-production near threshold and the strangeness $D$-term
Creators: name: Hatta, Yoshitaka
name: Strikman, Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present a model of exclusive $ϕ$-meson lepto-production $ep \to e'p'ϕ$ near threshold which features the strangeness gravitational form factors of the proton. We argue that the shape of the differential cross section $dσ/dt$ is a sensitive probe of the strangeness D-term of the proton.
description: 9 pages
Chemistry and physiology of feeding deterrent production by the marine diatom Phaeodactylum tricornutum
Creators: name: Shaw, Barbara Ann
Publisher: name: University of British Columbia
Year: 2009

description: It has been proposed that some marine phytoplankton use chemical feeding deterrents to reduce or inhibit zooplankton grazing. While a number of studies have shown that certain phytoplankton reduce zooplankton feeding, few studies have dealt with both the chemistry (isolation and identification) and the physiology of production of feeding deterrents. A bioassay to detect feeding deterrents was developed. This bioassay measured the rate of fecal pellet production of the harpacticoid copepod Tigriopus cattfornicus when fed a diet of the diatom Thalassiosira pseudonana in the presence of dissolved feeding deterrents. Using this bioassay, the cellular extracts of several species of phytoplankton were screened. The diatom Phaeodactylum tricornutum and the dinoflagellate Gonyaulax grindleyi were found to deter feeding. Bioassay-guided chemical fractionation was used to isolate the compounds responsible for the feeding deterrent activity of Phaeodactylum tricornutum. Spectroscopic techniques identified four of these compounds as apo-lO'-fucoxanthinal, apo-12'-fucoxanthinal, apo-12-fucoxanthinal, and apo-13'-fucoxanthinone. The IC₅₀ (concentration of compound at which feeding was inhibited by 50%) values ranged from 1.8 to 20 ppm, while the LC50 (concentration of compound at which there was a 50% mortality rate in the test population) ranged between 37 and 340 ppm. Preliminary studies on the physiology of production of these feeding deterrents were performed. In order to carry out these studies, an analytical HPLC method was developed to measure the apo-fucoxanthinoid concentrations in crude cell extracts. Detailed analysis of HPLC data collected on Phaeodactylum tricornutum cell extracts identified another potential feeding deterrent compound, apo-10-fucoxanthinal. Production of apo-fucoxanthinoids during the growth cycle of Phaeodactylum tricornutum and Thalassiosira pseudonana was tracked using HPLC and quantitative bioassays. Although apo-fucoxanthinoids were produced enzymatically from fucoxanthin by both diatoms, P. tricomutum produced much greater amounts of these compounds than T. pseudonana. Thus the degree of production appears to be species-specific. The production of total intracellular apo-fucoxanthinoids increased with the culture age and the degree of phosphate limitation experienced by the culture. The concentration of total intracellular apo-fucoxanthinoids in P. tricomutum was calculated to be 1000 times higher than the amount required to produce a 50% inhibition of fecal pellet production in the copepod Tigriopus califomicus.
Understanding Flare Statistics of Young Stars with TESS and Machine Learning
Creators: name: Feinstein, Adina
name: Montet, Benjamin
name: Ansdell, Megan
name: Nord, Brian
name: Bean, Jacob
name: Günther, Maximillian
name: Gully-Santiago, Michael
name: Schlieder, Joshua
Publisher: name: Zenodo
Year: 2021

description: The evolution of young stellar magnetic fields is not well understood. By studying observable proxies, such as stellar flares and starspots, we can begin to better understand such mechanisms. All-sky photometric time-series missions have allowed for the monitoring of thousands of young stars to understand the evolution of stellar activity. We have developed a convolutional neural network, stella, specifically trained to find flares in TESS short-cadence data. We applied the network to 3200 young stars to evaluate flare rates as a function of age and spectral type. We also measured rotation periods for 1500 of our targets and found that flares of all amplitudes are present across all spot phases, suggesting high spot coverage across the entire surface. Additionally, flare rates and amplitudes decrease for stars older than 50 Myr across all temperatures hotter than 4000 K, while cooler stars show no evolution across 800 Myr. Cooler stars also show higher flare rates and amplitudes across all ages, particularly those that are fully convective.
description: {"references": ["Feinstein, A. D., Montet, B. T., Ansdell, M. et al. (2020), arXiv:2005.07710", "Feinstein, A. D., Montet, B. T., & Ansdell, M. (2020), Reference for associated software: 10.21105/joss.02347"]}
RFI detection by automated feature extraction and statistical analysis
Creators: name: Winkel, Benjamin
name: Kerp, Juergen
name: Stanko, Stephan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we present an interference detection toolbox consisting of a high dynamic range Digital Fast-Fourier-Transform spectrometer (DFFT, based on FPGA-technology) and data analysis software for automated radio frequency interference (RFI) detection. The DFFT spectrometer allows high speed data storage of spectra on time scales of less than a second. The high dynamic range of the device assures constant calibration even during extremely powerful RFI events. The software uses an algorithm which performs a two-dimensional baseline fit in the time-frequency domain, searching automatically for RFI signals superposed on the spectral data. We demonstrate, that the software operates successfully on computer-generated RFI data as well as on real DFFT data recorded at the Effelsberg 100-m telescope. At 21-cm wavelength RFI signals can be identified down to the 4-sigma level. A statistical analysis of all RFI events detected in our observational data revealed that: (1) mean signal strength is comparable to the astronomical line emission of the Milky Way, (2) interferences are polarised, (3) electronic devices in the neighbourhood of the telescope contribute significantly to the RFI radiation. We also show that the radiometer equation is no longer fulfilled in presence of RFI signals.
description: 12 pages, 16 figures, accepted for publication in Astron. Notes
A new computational method to detect the phenomenon of the hidden break in 28S rRNA reveals its evolutionary distribution
Creators: name: Natsidis, Paschalis
name: Schiffer, Philipp H.
name: Irepan Salvador-Martínez
name: Telford, Maximillian J.
Publisher: name: F1000 Research Limited
Year: 2019

description: The eukaryotic ribosome is formed of a number of proteins and four structural ribosomal RNAs - 5S, 5.8S 18S and 28S. The last three of these are transcribed as a single molecule separated by Internal Transcribed Sequences, which are spliced out. In some species, the 28S rRNA undergoes an extra split during post transcriptional processing, forming 28Sα and 28Sβ. This phenomenon is known as the ‘hidden break’ and has to date always been investigated via electrophoresis. In species with the hidden break 28Sα and 28Sβ migrate as a single band along with the equally-sized 18S rRNA. Our new computational approach for identifying the hidden break is based on the expectation that RNA-Seq reads mapping to the region of the spliced region will be extremely rare (derived only from molecules that have not yet been processed). This approach allows the investigation of hidden break presence in many species without the need for fresh RNA material. By applying our method to >600 eukaryote species we show that it is mainly a feature of protostome animals, with few occasional losses within this group. Also, there are some events of convergence evolution outside metazoans, at least 4 of which are hidden breaks homologous to the protostome one. This is the first time that such a broad view of the evolutionary distribution of hidden break is achieved, and it will contribute in the way to understand the function and the role of this feature.
Broadband Fiber-based Entangled Photon Pair Source at Telecom O-band
Creators: name: Chen, Changjia
name: Xu, Calvin
name: Riazi, Arash
name: Zhu, Eric Y.
name: Gladyshev, Alexey V.
name: Kazansky, Peter G.
name: Qian, Li
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this letter, we report a polarization-entangled photon-pair source based on type-II spontaneous parametric down conversion at telecom O-band in periodically poled silica fiber (PPSF). The photon-pair source exhibits more than 130 nm (~24 THz) emission bandwidth centered at 1306.6 nm. The broad emission spectrum results in a short biphoton correlation time and we experimentally demonstrate a Hong-Ou-Mandel interference dip with a full width of 26.6 fs at half maximum. Owing to the low birefringence of the PPSF, the biphotons generated from type-II SPDC are polarization-entangled over the entire emission bandwidth, with a measured fidelity to a maximally entangled state greater than 95.4%. The biphoton source provides the broadest bandwidth entangled biphotons at O-band to our knowledge.
description: Accepted by Optic Letters
Dyon Spectrum in N=4 Supersymmetric Type II String Theories
Creators: name: David, Justin R.
name: Jatkar, Dileep P.
name: Sen, Ashoke
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the spectrum of quarter BPS dyons in freely acting Z_2 and Z_3 orbifolds of type II string theory compactified on a six dimensional torus. For large charges the result for statistical entropy computed from the degeneracy formula agrees with the corresponding black hole entropy to first non-leading order after taking into account corrections due to the curvature squared terms in the effective action. The result is significant since in these theories the entropy of a small black hole, computed using the curvature squared corrections to the effective action, fails to reproduce the statistical entropy associated with elementary string states.
description: LaTeX file, 32 pages; v2:minor changes
Conditional generation of an arbitrary superposition of coherent states
Creators: name: Takeoka, Masahiro
name: Sasaki, Masahide
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a scheme to conditionally generate an arbitrary superposition of a pair of coherent states from a squeezed vacuum by means of the modified photon subtraction where a coherent state ancilla and two on/off type detectors are used. We show that, even including realistic imperfections of the detectors, our scheme can generate a target state with a high fidelity. The amplitude of the generated states can be amplified by conditional homodyne detections.
description: 7 pages, 5 figures
Local and Approximate classification of spacetimes in the transverse frames
Creators: name: Rosato, Nicole
name: Nakano, Hiroyuki
name: Lousto, Carlos O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the definition of transverse frames and tetrad choices with regards to its application to numerically generated spacetimes, in particular those from the merger of binary black holes. We introduce the concept of local and approximate algebraic Petrov types in the strong field regime. We define an index $\mathcal{D}=\sqrt{12/I}\left(Ψ_2 - Ψ_3^2/Ψ_4\right)$ able to discriminate between Petrov types II and D and define regions of spacetime of those approximate types when used in conjunction with the speciality invariant $S=27J^2/I^3$. We provide an explicit example applying this method to Brill-Lindquist initial data corresponding to two nonspinning black holes from rest at a given initial separation. We find a doughnut-like region that is approximately of Petrov type II surrounded by an approximately Petrov type D region. We complete the study by proposing a totally symmetric tetrad fixing of the transverse frame that can be simply implemented in numerically generated spacetimes through the computation of spin coefficients ratios. We provide an application by explicitly deriving the Kerr-perturbative equations in this tetrad.
description: 18 pages, 11 figures
A two-component Arctic ambient noise model
Creators: name: Greening, Michael Victor
Publisher: name: University of British Columbia
Year: 2009

description: Short term Arctic ambient noise spectra over the frequency band 2 - 200 Hz are presented along with a two component noise model capable of reproducing these spectra. The model is based on the measured source spectrum and the spatial, temporal and source level distributions of both active pressure ridging and thermal ice cracking. Modeled ambient noise levels are determined by summing the input energy of the distributions of ice cracking and pressure ridging events and removing the propagation loss. Measurements were obtained on a 22-element vertical array along with a 7-element horizontal array deployed beneath the Arctic pack ice in 420 meters of water. Over 900 thermal ice-cracking events were detected in approximately 2 hours of data col lected over several days during April 1988. The source directivity for events beyond 40 wavelengths range was found to be accurately represented by a dipole with an approximate 3 dB increase above the dipole directivity pattern near 60° - 65° caused by the leaked longitudinal plate wave. A technique for measuring the bottom reflectivity function by correcting the bottom reflection of a thermal ice crack for the measured directivity is presented. The spatial distribution of thermal ice-cracking events is consistent with a uniform distribution. Source levels were measured from 110 to 180 dB //μPa²/ Hz at 1 m with the distribution of all events approximating a linearly decreasing function on a log-dB scale of the number of events versus source level. Near the end of the data collection period, measurements from a nearby active pressure ridge were obtained. Evidence is presented that the infrasonic peak observed near 10 Hz in Arctic ambient noise spectra may result from a frequency dependent propagation loss acting on the source spectrum of pressure ridging. Both modeled and measured ambient noise spectra show that ice cracking may dominate the spring-time ambient noise to frequencies as low 40 Hz. Below 40 Hz, the ambient noise is dominated by a single or few active pressure ridges at ranges of tens of kilometers. Above 40 Hz, the ambient noise is dominated by a large distribution of thermal ice-cracking events with over 50% of the total noise level produced by events within 6 km range and over 80% produced by events within 30 km range.
Persistent antimonotonic bifurcations and strange attractors for cubic homoclinic tangencies
Creators: name: Kiriki, Shin
name: Soma, Teruhiko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37C29;37D45

description: In this paper, we study a two-parameter family of two-dimensional diffeomorphisms such that it has a cubic homoclinic tangency unfolding generically which is associated with a dissipative saddle point. Our first theorem presents an open set in the parameter-plane such that, for any parameter value in the open set, there exists a one-parameter subfamily through this value exhibiting cubically related persistent contact-making and contact-breaking quadratic tangencies. Moreover, the second theorem shows that any such two-parameter family satisfies Wang-Young's conditions which guarantee that it exhibits a cubic polynomial-like strange attractor with an SRB measure.
description: 39 pages, 22 figures. To appear in Nonlinearity (accepted 20, March 2008)
Gravitational Yang-Lee Model. Four Point Function
Creators: name: Zamolodchikov, Al.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The four-point perturbative contribution to the spherical partition function of the gravitational Yang-Lee model is evaluated numerically. An effective integration procedure is due to a convenient elliptic parameterization of the moduli space. At certain values of the ``spectator'' parameter the Liouville four-point function involves a number of ``discrete terms'' which have to be taken into account separately. The classical limit, where only discrete terms contribute, is also discussed. In addition, we conjecture an explicit expression for this partition function at the ``second solvable point'' where the spectator matter is in fact another $M_{2/5}$ (Yang-Lee) minimal model.
Axially Overlapped Multi-Focus Light Sheet with Enlarged Field of View
Creators: name: Li, Hongjin
name: Wu, Zihan
name: Yang, Zhichao
name: Zhanghao, Karl
name: Xi, Peng
name: Jin, Dayong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Light sheet fluorescence microscopy provides optical sectioning and is widely used in volumetric imaging of large specimens. However, the axial resolution and the lateral Field of View (FoV) of the system, defined by the light sheet, typically limit each other due to the spatial band product of the excitation objective. Here, we develop a simple multi-focus scheme to extend the FoV, where a Gaussian light sheet can be focused at three or more consecutive positions. Axially overlapped multiple light sheets significantly enlarge the FoV with improved uniformity and negligible loss in axial resolution. By measuring the point spread function of fluorescent beads, we demonstrated that the obtained light sheet has a FoV of 450 um and a maximum axial FWHM of 7.5 um. Compared with the conventional single-focus one, the multi-focus Gaussian light sheet displays a significantly improved optical sectioning ability over the full FoV when imaging cells and zebrafish.
description: 4 Pages, 4 Figures
Στάσεις των εκπαιδευτικών απέναντι στις Τεχνολογίες της Πληροφορίας και επικοινωνίας (ΤΠΕ). Η περίπτωση διδασκαλίας της Ελληνικής ως Δεύτερης/Ξένης γλώσσας
Creators: name: Ποταμίτη, Δανάη Αναστασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Στάσεις
Δεύτερη/Ξένη γλώσσα
Τεχνολογίες της Πληροφορίας και Επικοινωνίας (ΤΠΕ)
Attitudes
Second/Foreign Language
Information and Communication Technologies (ICT)

description: Η παρούσα διατριβή παρουσιάζει τα αποτελέσματα μιας έρευνας, η οποία διεξήχθη με σκοπό να εντοπίσει το βαθμό ικανοτήτων και εξοικείωσης των εκπαιδευτικών πάνω στις Τεχνολογίες της Πληροφορίας και Επικοινωνίας (ΤΠΕ) καθώς και τις αντίστοιχες θέσεις και αντιλήψεις, που οι ίδιοι διαμορφώνουν, όσον αφορά την αξιοποίηση των υπολογιστών στη διαδικασία εκμάθησης μιας γλώσσας. H εργασία τοποθετείται γύρω από το πλαίσιο της ένταξης του υπολογιστή σε μία δεύτερη/ξένη γλώσσα και πιο συγκεκριμένα στη διδασκαλία Ελληνικής ως Δεύτερης ή Ξένης. Βασικός στόχος της έρευνας είναι η εξέταση των στάσεων των εκπαιδευτικών απέναντι στις ΤΠΕ αλλά και των διάφορων παραγόντων που είτε ενισχύουν, είτε δυσχεραίνουν την εισαγωγή των σύγχρονων μεθόδων διδασκαλίας κατά την εκμάθηση της νέας Ελληνικής ως δεύτερης/ξένης γλώσσας (Γ2)
description: The existing dissertation presents the results of a survey, that has been conducted in order to identify the degree of teachers’ skills and familiarity on the Information and Communication Technologies (ICT) as well as their respective positions and perspectives, regarding the computer’s utilization during the language learning process. The assignment is referred to the computer’s integration to a second/foreign language and more specific to the Greek language teaching as a second or foreign language. The main objective of the research is to investigate teachers’ attitudes towards ICT and moreover the various factors that enhance or imped the integration of synchronous teaching methods during the learning process of the Greek as a second/foreign language (L2)
Constraints on Type Ib/c and GRB Progenitors
Creators: name: Fryer, C. L.
name: Mazzali, P. A.
name: Prochaska, J.
name: Cappellaro, E.
name: Panaitescu, A.
name: Berger, E.
name: van Putten, M.
name: Heuvel, E. P. J. van den
name: Young, P.
name: Hungerford, A.
name: Rockefeller, G.
name: Yoon, S. -C.
name: Podsiadlowski, P.
name: Nomoto, K.
name: Chevalier, R.
name: Schmidt, B.
name: Kulkarni, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Although there is strong support for the collapsar engine as the power source of long-duration gamma-ray bursts (GRBs), we still do not definitively know the progenitor of these explosions. Here we review the current set of progenitor scenarios for long-duration GRBs and the observational constraints on these scenarios. Examining these, we find that single-star models cannot be the only progenitor for long-duration GRBs. Several binary progenitors can match the solid observational constraints and also have the potential to match the trends we are currently seeing in the observations. Type Ib/c supernovae are also likely to be produced primarily in binaries; we discuss the relationship between the progenitors of these explosions and those of the long-duration GRBs.
description: 36 pages, 6 figures
Evolving FIRE into a 5G-oriented experimental playground for vertical industries
Creators: name: Denazis, Spyros
name: Anastasius Gavras
Publisher: name: Zenodo
Year: 2017

description: 5G network infrastructures and embodied technologiesare considered as a key asset of an emerging common environment and instrumental for the digitalization of the traditional industries as they are positioned to “become a stakeholder driven, holistic environment for technical and business innovation integrating networking, computing and storage resources into one programmable and unified infrastructure” [1]. It is this 5G vision that when it is further projected to accommodate verticals raises a
 number of technical issues that require careful architectural consideration. Paper presentation at EUCNC 2017 WS
Quantum-embedding description of the Anderson lattice model with the ghost Gutzwiller Approximation
Creators: name: Frank, Marius S.
name: Lee, Tsung-Han
name: Bhattacharyya, Gargee
name: Tsang, Pak Ki Henry
name: Quito, Victor L.
name: Dobrosavljević, Vladimir
name: Christiansen, Ove
name: Lanatà, Nicola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present benchmark calculations of the Anderson lattice model based on the recently-developed "ghost Gutzwiller approximation". Our analysis shows that, in some parameters regimes, the predictions of the standard Gutzwiller approximation can be incorrect by orders of magnitude for this model. We show that this is caused by the inability of this method to describe simultaneously the Mott physics and the hybridization between correlated and itinerant degrees of freedom (whose interplay often governs the metal-insulator transition in real materials). Finally, we show that the ghost Gutzwiller approximation solves this problem, providing us with results in remarkable agreement with dynamical mean field theory throughout the entire phase diagram, while being much less computationally demanding. We provide an analytical explanation of these findings and discuss their implications within the context of ab-initio computation of strongly-correlated matter.
description: 13 pages, 6 figures
Grammatical elicitation: Object marking and fronting with ko
Creators: name: Yegon, Kiplangat
name: Bossi, Madeline
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .mp4 file and one .pdf file. Elicitation of object marking patterns in different semantic contexts (e.g. corrections, answers to wh-questions). Elicitation of reconstruction effects with fronting with ko.
Phase diagram of an Ising model for ultrathin magnetic films
Creators: name: Pighin, S. A.
name: Cannas, S. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the critical properties of a two--dimensional Ising model with competing ferromagnetic exchange and dipolar interactions, which models an ultra-thin magnetic film with high out--of--plane anisotropy in the monolayer limit. In this work we present a detailed calculation of the $(δ,T)$ phase diagram, $δ$ being the ratio between exchange and dipolar interactions intensities. We compare the results of both mean field approximation and Monte Carlo numerical simulations in the region of low values of $δ$, identifying the presence of a recently detected phase with nematic order in different parts of the phase diagram, besides the well known striped and tetragonal liquid phases. A remarkable qualitative difference between both calculations is the absence, in this region of the Monte Carlo phase diagram, of the temperature dependency of the equilibrium stripe width predicted by the mean field approximation. We also detected the presence of an increasing number of metastable striped states as the value of $δ$ increases.
description: 9 pages, 9 figures
About estimations of an one-photon background in neutrino oscillation experiments at low neutrino energies
Creators: name: Efrosinin, V. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The possible sources of one-photon radiation as background for quasi-elastic reaction nu_mu+n to mu^-+p are considered. The ones are relevant in experiments on determination of oscillation parameters at low neutrino energies (E_nu^lab~1 GeV). The estimation for the cross section of reaction nu_mu+n to mu^-+p+gamma is given at E_nu^lab=0.7 GeV as 0.65% from the corresponding cross section of quasi-elastic reaction.
description: 17 pages, 10 figures
The Global Magneto-Ionic Medium Survey: A Faraday Depth Survey of the Northern Sky Covering 1280-1750 MHz
Creators: name: Wolleben, M.
name: Landecker, T. L.
name: Douglas, K. A.
name: Gray, A. D.
name: Ordog, A.
name: Dickey, J. M.
name: Hill, A. S.
name: Carretti, E.
name: Brown, J. C.
name: Gaensler, B. M.
name: Han, J. L.
name: Haverkorn, M.
name: Kothes, R.
name: Leahy, J. P.
name: McClure-Griffiths, N.
name: McConnell, D.
name: Reich, W.
name: Taylor, A. R.
name: Thomson, A. J. M.
name: West, J. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy, and at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the the range 1280-1750 MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, declinations -30 to +87 degrees at all right ascensions. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40'. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 radians per square metre and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 radians per square metre are represented. The maximum detectable Faraday depth is +/- 20,000 radians per square metre. The survey data are available at the Canadian Astronomy Data Centre.
description: Accepted for publication in the Astronomical Journal
Το όνομα του εγκλήματος. Μελέτη της Σύμβασης για την Πρόληψη και Καταστολή του Εγκλήματος της Γενοκτονίας
Creators: name: Κατσιάβαλου, Αναστασία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Γενοκτονία
Σύμβαση-Ρουάντα
Genocide
Convention-Rwanda

description: Σκοπός της διπλωματικής μου εργασίας ήταν η μελέτη της Σύμβασης για την Πρόληψη και Καταστολή του Εγκλήματος της Γενοκτονίας. Παραθέσαμε μια ιστορική αναδρομή του όρου και εξετάσαμε τις συνθήκες, οι οποίες οδήγησαν, τελικά, στην ανάγκη υιοθέτησης και υπογραφής της Σύμβασης για την Πρόληψη και Καταστολή του Εγκλήματος της Γενοκτονίας. Στη συνέχεια, παρουσιάσαμε αναλυτικά τα κυριότερα άρθρα της Σύμβασης για την Γενοκτονία, ξεκινώντας από το προοίμιο αυτής και καταλήγοντας στις διάφορες μορφές εμφάνισης του εγκλήματος και την ενδεχόμενη ευθύνη που πηγάζει από την Σύμβαση. Ακόμη, ασχοληθήκαμε με την καταγραφή και αξιολόγηση αποφάσεων διεθνών δικαστηρίων επί εγκλημάτων γενοκτονίας κατά τον 20ο αιώνα. Τέλος, στον επίλογο επιχειρούμε να κάνουμε μια εκτίμηση των κεκτημένων μέχρι σήμερα της Σύμβασης και να υπερτονίσουμε τη σημασία της, καθώς καθίσταται χρήσιμο εργαλείο και στις μέρες μας
description: The purpose of my master thesis was to study the Convention on the Prevention and Punishment of the Crime of Genocide. We handed out the history of the terminology and we examined the conditions that led to the adaptation of the Convention. In the following chapters we presented the main articles of the Convention on the Prevention and Punishment of the Crime of Genocide, starting from the preamble of the Convention and concluding in the different forms that a genocide act might appear and the following responsibility. Also, we pointed out numerous case studies and court decision concerning the genocides of the 20th century. Finally, we are trying to examine the Convention and to highlight its meaning especially nowadays
Relationship between solar energetic particle intensities and coronal mass ejection kinematics using STEREO/SECCHI field of view
Creators: name: Ravishankar, Anitha
name: Michalek, Grzegorz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Solar energetic particles (SEPs) accelerated from shocks driven by coronal mass ejections (CMEs) are one of the major causes of geomagnetic storms on Earth. Therefore, it is necessary to predict the occurrence and intensity of such disturbances. For this purpose we analyzed in detail 38 non-interacting halo and partial halo CMEs, as seen by the Solar and Heliospheric Observatory /Large Angle and Spectrometric Coronagraph (SOHO/LASCO), generating SEPs (in >10 MeV, >50 MeV, and >100 MeV energy channels) during the quadrature configuration of the Solar TErrestrial RElations Observatory (STEREO) twin spacecrafts with respect to the Earth, which marks the ascending phase of solar cycle 24 (i.e., 2009-2013). The main criteria for this selection period is to obtain height-time measurements of the CMEs without significant projection effects and in a very large field of view. Using the data from STEREO/Sun Earth Connection Coronal and Heliospheric Investigation (STEREO / SECCHI) images we determined several kinematic parameters and instantaneous speeds of the CMEs. First, we compare instantaneous CME speed and Mach number versus SEP fluxes for events originating at the western and eastern limb we observe high correlation for the western events and anticorrelation for the eastern events. Next we investigated instantaneous CME kinematic parameters such as maximum speed, maximum Mach number, and the CME speed and Mach number at SEP peak flux versus SEP peak fluxes. Highly positive correlation is observed for Mach number at SEP peak flux for all events. The obtained instantaneous Furthermore, we conducted estimates of delay in time and distance between CME, SEP, and shock parameters. Comparative studies of the considered energy channels of the SEPs also throw light on the reacceleration of suprathermal seed ions by CME-driven shocks that are pre-accelerated in the magnetic reconnection.
description: 18 pages, 14 figures, 6 tables
Non-Gaussian Covariance of CMB B-modes of Polarization and Parameter Degradation
Creators: name: Li, Chao
name: Smith, Tristan L.
name: Cooray, Asantha
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The B-mode polarization lensing signal is a useful probe of the neutrino mass and to a lesser extent the dark energy equation of state as the signal depends on the integrated mass power spectrum between us and the last scattering surface. This lensing B-mode signal, however, is non-Gaussian and the resulting non-Gaussian covariance to the power spectrum cannot be ignored as correlations between B-mode bins are at a level of 0.1. For temperature and E-mode polarization power spectra, the non-Gasussian covariance is not significant, where we find correlations at the 10^{-5} level even for adjacent bins. The resulting degradation on neutrino mass and dark energy equation of state is about a factor of 2 to 3 when compared to the case where statistics are simply considered to be Gaussian. We also discuss parameter uncertainties achievable in upcoming experiments and show that at a given angular resolution for polarization observations, increasing the sensitivity beyond a certain noise value does not lead to an improved measurement of the neutrino mass and dark energy equation of state with B-mode power spectrum. For Planck, the resulting constraints on the sum of the neutrino masses is ~ 0.2 eV and on the dark energy equation of state parameter we find, sigma_w ~ 0.5.
description: 11 pages, 5 figures, minor changes, submitted to PRD
Airborne multispectral imagery for classification of intertidal habitat, Fraser River, British Columbia
Creators: name: Aitken, Jennifer Anthea
Publisher: name: University of British Columbia
Year: 2009

description: In intertidal environments, complex vegetation associations, hydrodynamics, and substrate variabilities make accurate mapping and monitoring difficult. Airborne multispectral imaging systems offer a synoptic view with the advantage of programmable handset selection in the visible and near infrared (NIR), increased spatial resolution compared to satellite imaging systems and greater spectral resolution compared with aerial photographs. Eight flight lines of image data of an island marsh complex in the Main Arm of the Fraser River, British Columbia were collected on June 19, 1992 with a Compact Airborne Spectrographic Imager (CASI). An eleven channel handset was configured in the visible and NIR with a spatial resolution (pixel size) of 3.5 m². Spectral signatures of dominant vegetation communities (forest, willow, cattail, sedge, bulrush) and tidal flat, drift logs and necrotic biomass were generated from the image and used in a supervised classification to produce a habitat map. Close coexistence and similar spectral response complicated differentiation of sedge and cattail. Vertical growth of bulrush increased contribution of soil background and affected spectral response. The vegetation index (NIR-red/NIR+red) was found to be insufficient in estimating green biomass in areas containing a high percentage of necrotic biomass or silt covered vegetation. Results of the classification are presented in an error matrix. Vegetation communities and substrate classify 70%-82% correct, individual training areas 61% to 89% correct. Lower accuracies were found in mixed sedge communities (70%) and the dead biomass class (74%). Nonvegetated areas (tidal flat and drift logs) exhibit the most distinct spectral response, 81% and 82% correct. Two surveys of the marsh were conducted on foot in Ladner Marsh in spring and summer to field test the classified map. Fourteen sites were visited, of which three indicated some degree of misclassification, providing a field test accuracy of 78%. Spatial accuracy is determined by an overlay of GPS-referenced ground truth with the classified map. Spatial agreement between cattail, sedge and bulrush ground truth was 20.4 m., 14.4 m., and 53.5 m. respectively. Sedge had the greatest number of classified pixels and bulrush the least, suggesting the influence of population size in the agreement. Poor geometric rectification of imagery degraded agreement.
Electrostatic image effects for counter-ions between charged planar walls
Creators: name: Kanduc, M.
name: Podgornik, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the effect of dielectric inhomogeneities on the interaction between two planparallel charged surfaces with oppositely charged mobile charges in between. The dielectric constant between the surfaces is assumed to be different from the dielectric constant of the two semiinfinite regions bounded by the surfaces, giving rise to electrostatic image interactions. We show that on the weak coupling level the image charge effects are generally small, making their mark only in the second order fluctuation term. However, in the strong coupling limit, the image effects are large and fundamental. They modify the interactions between the two surfaces in an essential way. Our calculations are particularly useful in the regime of parameters where computer simulations would be difficult and extremely time consuming due to the complicated nature of the long range image potentials.
description: 21 pages, 8 figures
On Automatic Continuity of 3-Homomorphisms on Banach Algebras
Creators: name: Bracic, Janko
name: Moslehian, Mohammad Sal
Publisher: name: arXiv
Year: 2006
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: Primary 47B48, secondary 46L05, 16Wxx

description: A linear map $ϕ:{\mathcal A}\to {\mathcal B} $ between (Banach) algebras is called 3-homomorphism if $ϕ(abc)=ϕ(a)ϕ(b)ϕ(c)$ for each $a, b, c \in {\mathcal A}$. We investigate 3-homomorphisms on Banach algebras with bounded approximate identities and establish in two ways that every involution preserving homomorphism between $C^*$-algebras is norm decreasing.
description: 7 Pages (Minor revision), to appear in Bull. Malays. Math. Sci. Soc
Investigating young learners’ ICT and English language-related extramural activities
Creators: name: Ηλιάδου, Βασιλική Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Εξωσχολικές δραστηριότητες στην Αγγλική Γλώσσα
Ψηφιακά παιχνίδια
Extramural English
Digital games
Κίνητρο για εκμάθηση αγγλικής γλώσσας
Motivation for learning english

description: Σκοπός της διατριβής ήταν να διερευνήσει τις εξωσχολικές δραστηριότητες μαθητών ενός δημοτικού σχολείου στην Ελλάδα που σχετίζονται με την Αγγλική γλώσσα και τις Νέες Τεχνολογίες. Για τους σκοπούς της παρούσας μελέτης συλλέχθηκαν δύο τύποι δεδομένων, ένα ερωτηματολόγιο και ένα ημερολόγιο ελεύθερου χρόνου. Τα δεδομένα χρησιμοποιήθηκαν με στόχο την καταγραφή του είδους, καθώς και του χρόνου που οι μαθητές αφιερώνουν στις προαναφερθείσες δραστηριότητες. Στη συνέχεια, οι μαθητές χωρίστηκαν σε τρεις ομάδες ψηφιακού παιχνιδιού, ανάλογα με το χρόνο ενασχόλησης τους με τα ψηφιακά παιχνίδια και εξετάστηκε μια πιθανή συσχέτιση με την αυτό-αξιολόγηση των μαθητών, τις στάσεις, τα κίνητρα ως προς την αγγλική γλώσσα, καθώς και στρατηγικές αλλά και άγχος παραγωγής προφορικού λόγου στη γλώσσα-στόχο. Αν και τα αποτελέσματα έδειξαν ότι η ενασχόληση με τα ψηφιακά παιχνίδια δεν φαίνεται να παίζει καθοριστικό ρόλο ως προς τα παραπάνω, διαπιστώθηκε ότι το δείγμα αυτής της έρευνας αφιερώνει ένα σημαντικό χρόνο σε δραστηριότητες που σχετίζονται με την αγγλική γλώσσα, γεγονός το οποίο έχει παιδαγωγική σημασία
description: The aim of this thesis was to investigate out of school ICT and English language-related activities of primary school students in the Greek context. For the purpose of this study two types of data were collected, a questionnaire and a free-time activities diary. They aimed at providing information about both the type, as well as the time that students engaged in Extramural ICT and English language-related activities. Data were used to divide students into three digital game groups according to the time they reported that they engaged in digital game playing. Through the lenses of digital game playing, a potential correlation with students’ self-assessment, attitudes, motivation to English language, speaking strategies and speaking anxiety were examined. Although results indicated that digital game playing does not seem to play a decisive role on affective factors, it has been established that the sample of this experiment spent a considerable amount of time on Extramural English which has certain pedagogical implications
Time Reversal Mirror and Perfect Inverse Filter in a Microscopic Model for Sound Propagation
Creators: name: Calvo, Hernan L.
name: Danieli, Ernesto P.
name: Pastawski, Horacio M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Time reversal of quantum dynamics can be achieved by a global change of the Hamiltonian sign (a hasty Loschmidt daemon), as in the Loschmidt Echo experiments in NMR, or by a local but persistent procedure (a stubborn daemon) as in the Time Reversal Mirror (TRM) used in ultrasound acoustics. While the first is limited by chaos and disorder, the last procedure seems to benefit from it. As a first step to quantify such stability we develop a procedure, the Perfect Inverse Filter (PIF), that accounts for memory effects, and we apply it to a system of coupled oscillators. In order to ensure a many-body dynamics numerically intrinsically reversible, we develop an algorithm, the pair partitioning, based on the Trotter strategy used for quantum dynamics. We analyze situations where the PIF gives substantial improvements over the TRM.
description: Submitted to Physica B
The disc random packing problem: a disorder criterion and an explicit solution
Creators: name: Blumenfeld, Raphael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Predicting the densest random disc packing fraction is an unsolved paradigm problem relevant to a number of disciplines and technologies. One difficulty is that it is ill-defined without setting a criterion for the disorder. Another is that the density depends on the packing protocol and the multitude of possible protocol parameters has so far hindered a general solution. A new approach is proposed here. After formulating a well-posed form of the general protocol-independent problem for planar packings of discs, a systematic criterion is proposed to avoid crystalline hexagonal order as well as further topological order. The highest possible random packing fraction is then derived exactly: $ϕ_{RCP}=0.852525...$. The solution is based on the cell order distribution that is shown to: (i) yield directly the packing fraction; (ii) parameterise all possible packing protocols; (iii) make it possible to define and limit all topological disorder. The method is further useful for predicting the highest packing fraction in specific protocols, which is illustrated for a family of simply-sheared packings that generate maximum-entropy cell order distributions.
description: 4 pages, 2 figures, typo corrected in v2
The influence of ultra-high-energy cosmic rays on star formation in the early universe
Creators: name: Vasiliev, E. O.
name: Shchekinov, Yu. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The presence of ultra-high-energy cosmic rays (UHECR) results in an increase in the degree of ionization in the post-recombination Universe, which stimulates the efficiency of the production of H$_2$ molecules and the formation of the first stellar objects. As a result, the onset of the formation of the first stars is shifted to higher redshifts, and the masses of the first stellar systems decrease. As a consequence, a sufficient increase in the ionizing radiation providing the reionization of the Universe can take place. We discuss possible observational manifestations of these effects and their dependence on the parameters of UHECR.
description: 10 pages, 5 figures