cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Melt Procedure Affects the Photosynthetic Response of Sea Ice Algae.
Creators: name: Campbell, Karley
name: Mundy, C. J.
name: Juhl, Andrew R.
name: Dalman, Laura A.
name: Michel, Christine
name: Galley, Ryan J.
name: Else, Brent E.
name: Geilfus, Nicolas X.
name: Rysgaard, Søren
Publisher: name: UNESCO/IOC
Year: 2019
Subjects: subject: Algae
subject: Salinity stress
subject: Photophysiology
subject: Sample melt
subject: Parameter Discipline::Biological oceanography::Macroalgae and seagrass

description: The accuracy of sea ice algal production estimates is influenced by the range of melting procedures used in studies to obtain a liquid sample for incubation, particularly in relation to the duration of melt and the approach to buffering for osmotic shock. In this research, ice algal photophysiology from 14C incubations was compared in field samples prepared by three melt procedures: (i) a rapid 4 h melt of the bottommost ( < 1 cm) ice algal layer scraped into a large volume of filtered seawater (salinity 27–30), (ii) melt of a bottom 5 cm section diluted into a moderate volume of filtered seawater over 24 h (salinity 20–24), and (iii) melt of a bottom 5 cm section without any filtered seawater dilution over about 48 h (salinity 10–12). Maximum photosynthetic rate, photosynthetic efficiency and production at zero irradiance were significantly affected by the melt treatment employed in experiments. All variables were greatest in the highly diluted scrape sample and lowest in the bulk-ice samples melted in the absence of filtered seawater. Laboratory experiments exposing cultures of the common sea ice diatom Nitzschia frigida to different salinities and light conditions suggested that the field-based responses can be attributed to the rapid ( < 4 h) adverse effects of exposing cells to low salinities during melt without dilution. The observed differences in primary production between melt treatments were estimated to account for over 60% of the variability in production estimates reported for the Arctic. Future studies are strongly encouraged to replicate salinity conditions representative of in situ values during the melting process to minimize hypoosmotic stress, thereby most accurately estimating primary production.
Asymptotic analysis of spin-foams with time-like faces in a new parameterisation
Creators: name: Simão, José Diogo
name: Steinhaus, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this article we study the Conrady-Hnybida extension of the Lorentzian Engle-Pereira-Rovelli-Livine spin-foam model, which admits time-like cells rather than just space-like ones. Our focus is on the asymptotic analysis of the model's vertex amplitude. We propose a new parametrization for states associated to time-like 3-cells, from which we derive a closed-form expression for their amplitudes. This allows us to revisit the conditions under which critical points of the amplitudes occur, and we find Regge-like geometrical critical points in agreement with the literature. However, we find also evidence for non-geometrical points which are not dynamically suppressed without further assumptions; the model then does not strictly asymptote to the Regge action, contrary to what one would expect. We moreover prove Minkowski and rigidity theorems for Minkowskian polyhedra, extending the asymptotic analysis to non-simplicial spin-foams.
description: 33 pages + 17 pages appendices, 4 figures, v2: minor update on cosine problem, v3: removed wrong claim on cosine problem, v4: matching version accepted for publication, updated discussion on completion of asymtotic analysis
Ethical issues encountered by nurses
Creators: name: Hollands, Deborah
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to describe the nature of ethical issues encountered by nurses working on medical/surgical nursing units and the degree to which they found these issues disturbing. Relationships among demographic variables and nurses’ experience with specific ethical issues were also examined. A survey of a stratified random sample of 400 Registered Nurses in British Columbia working on medical/surgical nursing units was completed. The “Survey of Ethical Issues in Nursing - Revised” (SEIN - R) and a demographic form were mailed to each participant. Two hundred and two questionnaires (50.5%) were returned and 196 (49%) used in the analysis. The findings indicate that nurses perceive that they “rarely” encountered ethical issues as identified in the instrument. The five most frequently encountered ethical issues that nurses reported were: (1) unsafe staffing patterns, (2) family demands for futile treatment, (3) prolongation of life when death was inevitable, (4) unprofessional conduct of a colleague, and (5) disagreements with physicians over patient care. Overall, nurses reported being at least “somewhat” disturbed about the ethical issues they encountered or would have become so if they had encountered these situations in the practice setting. When asked to identify how disturbed they were or would be by the 26 ethical issues included in the SEIN - R, the five most disturbing issues were: (1) working with physicians who demonstrated inadequate knowledge and skills, (2) unsafe staffing patterns, (3) prolongation of life when death was inevitable, (4) caring for a patient whose family was demanding futile treatment, and (5) knowing that information about a patient’s prognosis was being withheld from the patient and/or family. The findings also suggest that a number of statistically significant but weak relationships exist between the five most frequent and the five most disturbing ethical issues, and select demographics. The most common resource nurses use when addressing ethical issues is their nursing colleagues. Relatively few nurses used their Canadian Nurses Association Code of Ethics for Nursing to guide them in their ethical decision-making; more used the Registered Nurses Association of British Columbia Standards for Nursing Practice.
The Monitor project: Rotation of low-mass stars in the open cluster NGC 2516
Creators: name: Irwin, Jonathan
name: Hodgkin, Simon
name: Aigrain, Suzanne
name: Hebb, Leslie
name: Bouvier, Jerome
name: Clarke, Cathie
name: Moraux, Estelle
name: Bramich, D. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the results of an i-band time-series photometric survey of NGC 2516 using the CTIO 4m Blanco telescope and 8k Mosaic-II detector, achieving better than 1% photometric precision per data point over 150.25 days, and the slowest rotators for M~0.5 M_solar following a flatter relation closer to P ~ constant. Models of the rotational evolution were investigated, finding that the evolution of the fastest rotators was well-reproduced by a conventional solid body model with a mass-dependent saturation velocity, whereas core-envelope decoupling was needed to reproduce the evolution of the slowest rotators. None of our models were able to simultaneously reproduce the behaviour of both populations.
description: 19 pages, 24 figures, 1 table, accepted for publication in MNRAS
Το πρόγραμμα ανταλλαγής ομολόγων του Ελληνικού Δημοσίου με τον ιδιωτικό τομέα κατά το ν. 4050/2012.: H εξέταση της νομιμότητας της αναδιάρθρωσης του ελληνικού δημοσίου χρέους με τη συμμετοχή του ιδιωτικού τομέα (PSI) μέσα από τη νομολογία
Creators: name: Καλογεράκης, Μιχαήλ Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αναδιάρθρωση χρέους
Ομόλογα
Eλληνική κρίση χρέους
Debt Restructuring
Bonds
Greek debt crisis

description: Ο στόχος της παρούσας διπλωματικής εργασίας είναι να εξετάσει τη νομιμότητας της αναδιάρθρωσης του ελληνικού χρέους με τη συμμετοχή του ιδιωτικού τομέα που έλαβε χώρα σύμφωνα με το νόμο 4050/2012. Για αυτόν τον σκοπό μελετήθηκαν και αποτελούν το βασικό κομμάτι αυτής της εργασίας οι αποφάσεις των ελληνικών δικαστηρίων, του Ευρωπαϊκού Δικαστηρίου Δικαιωμάτων του Ανθρώπου και του Δικαστηρίου της Ευρωπαϊκής Ένωσης. Μετά από την εξέταση των αιτιών της ελληνικής κρίσης χρέους και της ενεργοποίησης του μηχανισμού του PSI αναφερόμαστε στις βασικές παραμέτρους του ελληνικού PSI. Πιο ειδικά, αναλύουμε τη λειτουργία του μηχανισμού όπως εφαρμόστηκε μέσα από το πρόγραμμα ανταλλαγής ομολόγων, εστιάζοντας στα ειδικά χαρακτηριστικά αυτού του μηχανισμού όπως η εισαγωγή των Ρητρών Συλλογικής Δράσης (ΡΣΔ) και παρουσιάζουμε τα αποτελέσματα του. Όσον αφορά την ελληνική νομολογία, δίνεται έμφαση στην απόφαση ΟλΣτΕ 1116/2014. Όσον αφορά τη νομολογία των λοιπών ευρωπαϊκών δικαστηρίων, αναφερόμαστε στις σχετικές αποφάσεις του Δικαστηρίου της Ευρωπαϊκής Ένωσης (Fahnenbrock ; Alessandro Accorinti) και στην τελευταία σχετική απόφαση του ΕΔΔΑ Μαμάτας και λοιποί κατά Ελλάδος (21.07.2016)
description: The aim of this master thesis is to examine the liability of the Greek Debt Restructuring held by private investors (PSI) under the law no. 4050/2012 . For this purpose, case law of the greek national courts, the European Court of Human rights, the European Court of Justice has been studied as the main part of this thesis. After the examination of the causes of the Greek Debt Crisis and the triggering of the PSI mechanism, we refer to the basic parameters of the Greek PSI. More specifically, we analyze the function of the PSI mechanism as it was implemented through the bond exchange program, focusing on the special futures of this mechanism such as the introduction of the Collective Action Clauses (CACs) and we present its results. Within this framework, the most significant cases of the abovementioned courts are presented. As far as the national case law is concerned, emphasis is given to the no. 1116/2014 judgment of the Greek Council of State. As far as the case law of the other courts mentioned above is concerned, we address to the relevant cases of the European Court of Justice (Fahnenbrock ; Alessandro Accorinti) and to the latest relevant decision of the European Court of Humans Rights, Mamatas and others against Greece (21.07.2016)
High-entropy van der Waals materials formed from mixed metal dichalcogenides, halides and phosphorus trisulfides
Creators: name: Ying, Tianping
name: Yu, Tongxu
name: Shiah, Yu-Shien
name: Li, Changhua
name: Li, Jiang
name: Qi, Yanpeng
name: Hosono, Hideo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The charge, spin, and composition degrees of freedom in high-entropy alloy endow it with tunable valence and spin states, infinite combinations and excellent mechanical performance. Meanwhile, the stacking, interlayer, and angle degrees of freedom in van der Waals material bring it with exceptional features and technological applications. Integration of these two distinct material categories while keeping their merits would be tempting. Based on this heuristic thinking, we design and explore a new range of materials (i.e., dichalcogenides, halides and phosphorus trisulfides) with multiple metallic constitutions and intrinsic layered structure, which are coined as high-entropy van der Waals materials. Millimeter-scale single crystals with homogeneous element distribution can be efficiently acquired and easily exfoliated or intercalated in this materials category. Multifarious physical properties like superconductivity, magnetic ordering, metal-insulator transition and corrosion resistance have been exploited. Further research based on the concept of high-entropy van der Waals materials will enrich the high-throughput design of new systems with intriguing properties and practical applications.
description: 10 pages, 3 figures, and 1 table
Chemical composition, antibacterial and antioxidative activities of Monotheca buxifolia (Falc.) A. DC leaves essential oil
Creators: name: Ali, Joham Sarfraz
name: Azeem, Muhammad
name: Mannan, Abdul
name: Zia, Muhammad
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Monotheca buxifolia (Sapotaceae) is used against different heath aliments due to auspicious biological properties. Essential oil was extracted from leaves of M. buxifolia through steam distillation. Gas chromatography coupled with mass spectrometry (GC-MS) showed presence of 34 compounds. Geranyl acetone (12.6%), nonanal (9.0%) and champhor (8.0%) were abundant while (E)-β-ionone, cis-carvone oxide and caryophyllene oxide were also found. The oil presented 50.2% free radical scavenging activity while total antioxidant potential and total reducing power potential were 40.0 µg AAE/mL and 38.7 µg AAE/mL, respectively. The extracted oil presented moderate activity against Escherichia coli (14 mm) and Bacillus subtilis (11 mm). The study concludes that the essential oil of M. buxifolia leaves has diverse chemical composition and biological activities therefore can be explored for therapeutic potential.
A Beta Beam complex based on the machine upgrades for the LHC
Creators: name: Donini, A.
name: Fernandez-Martinez, E.
name: Migliozzi, P.
name: Rigolin, S.
name: Lavina, L. Scotto
name: de Fatis, T. Tabarelli
name: Terranova, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Beta Beam CERN design is based on the present LHC injection complex and its physics reach is mainly limited by the maximum rigidity of the SPS. In fact, some of the scenarios for the machine upgrades of the LHC, particularly the construction of a fast cycling 1 TeV injector (``Super-SPS''), are very synergic with the construction of a higher $γ$ Beta Beam. At the energies that can be reached by this machine, we demonstrate that dense calorimeters can already be used for the detection of $ν$ at the far location. Even at moderate masses (40 kton) as the ones imposed by the use of existing underground halls at Gran Sasso, the CP reach is very large for any value of $θ_{13}$ that would provide evidence of $ν_e$ appearance at T2K or NO$ν$A ($θ_{13}\geq 3^\circ$). Exploitation of matter effects at the CERN to Gran Sasso distance provides sensitivity to the neutrino mass hierarchy in significant areas of the $θ_{13}-δ$ plane.
Accurate and Precise Effective Temperatures for Cool Stars
Creators: name: Miller, Nicola J.
name: Maxted, Pierre F. L.
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence

description: There is an urgent need for benchmark stars with effective temperature measurements that are both accurate and precise. There are few standard stars currently available with effective temperature measurements that meet the required accuracy for calibrating temperature indicators for cool dwarf stars (+/- 50K or better). We present a new method that uses high-precision measurements of eclipsing binary stars, Gaia parallaxes and multi-wavelength photometry to obtain very accurate fundamental effective temperatures. These measurements can be used to establish a set of benchmark stars. Initial results for the F7V+K0IV binary AI Phoenicis are promising: $T_1 = 6199 \pm 22$ K and $T_2 = 5094 \pm 16$ K (Miller, Maxted & Smalley, 2020). We have now applied the method to the newly identified system ASAS J051753-5406.0 (CPD-54 810) and present our preliminary results.
description: {"references": ["Silva Aguirre, Victor et al (2017) arXiv:1611.08776", "Heiter, U et al (2015) arXiv:1506.06095", "Holmberg, J et al (2009) arXiv:0811.3982", "Ratajczak, M et al (2021) arXiv:2011.14683", "Miller, N et al (2020) arXiv:2004.04568"]}
Characterizing the dynamical phase diagram of the Dicke model via classical and quantum probes
Creators: name: Lewis-Swan, R. J.
name: Muleady, S. R.
name: Barberena, D.
name: Bollinger, J. J.
name: Rey, A. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We theoretically study the dynamical phase diagram of the Dicke model in both classical and quantum limits using large, experimentally relevant system sizes. Our analysis elucidates that the model features dynamical critical points that are distinct from previously investigated excited-state equilibrium transitions. Moreover, our numerical calculations demonstrate that mean-field features of the dynamics remain valid in the exact quantum dynamics, but we also find that in regimes where quantum effects dominate signatures of the dynamical phases and chaos can persist in purely quantum metrics such as entanglement and correlations. Our predictions can be verified in current quantum simulators of the Dicke model including arrays of trapped ions.
description: 5+8 pages, 4+5 figures. Accepted version
Fluoroquinolone residues in raw meat from open markets in Ibadan, Southwest, Nigeria
Creators: name: Omotoso, Adekunbi Bridget
name: Omojola, Andrew Babatunde
Publisher: name: Department of Health, Animal Science and Food Safety (VESPA)
Year: 2015
Subjects: Fluoroquinolone residues, Ciprofloxacin, Norfloxacin, Ofloxacin, Consumer protection, Meat safety

description: Misuse of fluoroquinolones in livestock production may lead to the presence of their residues in tissues of meat animals after slaughter, constituting health hazards to consumers. The present study was designed to screen for residues of three fluoroquinolones (ciprofloxacin, norfloxacin and ofloxacin) in raw meat. Microbiological assay, followed by High Performance Liquid Chromatography (HPLC) was used to screen three hundred and twenty samples of beef, chicken, pork and chevon purchased from open markets. Initial screening by microbiological assay revealed that 50%, 55%, 40% and 40% of beef, chicken, pork and chevon, respectively were positive for residues of antibiotics. Further analysis by HPLC with UV detection revealed the presence of ciprofloxacin, norfloxacin and ofloxacin at varying concentrations in the meat samples. Ofloxacin was the least in frequency and abundance in all meat types. Results obtained in this study have implications for public health and will lead to steps that will further enhance the safety of animal foods in order to protect consumers and the animal production industry
description: International Journal of Health, Animal Science and Food Safety, Vol 2, No 1 (2015)
Diagrammatic Determinantal methods: projective schemes and applications to the Hubbard-Holstein model
Creators: name: Assaad, F. F.
name: Lang, T. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We extend the weak-coupling diagrammatic determinantal algorithm to projective schemes as well as to the inclusion of phonon degrees of freedom. The projective approach provides a very efficient algorithm to access zero temperature properties. To implement phonons, we integrate them out in favor of a retarded density-density interaction and simulate the resulting purely electronic action with the weak-coupling diagrammatic determinantal algorithm. Both extensions are tested within the dynamical mean field approximation for the Hubbard and Hubbard-Holstein models.
description: 8 pages, 4 figures, final version as appeared in PRB
Εισφορές Ι.Κ.Ε.
Creators: name: Βενιζέλος-Αλέξανδρος, Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ιδιωτική κεφαλαιουχική εταιρία
Εισφορές
Private company
Contributions

description: Στην παρούσα διπλωματική εργασία αναλύεται η τριμερής διάκριση των εισφορών στην ιδιωτική κεφαλαιουχική εταιρία, ήτοι οι κεφαλαιουχικές, εξωκεφαλαιακές και εγγυητικές εισφορές όπως θεσπίστηκαν από τον Ν. 4072/2012 και τις επιμέρους τροποποιήσεις του μέχρι και σήμερα. Στις πρώτες παραγράφους, παρουσιάζονται τα γενικά χαρακτηριστικά της ΙΚΕ, τα εταιρικά μερίδια και εξειδικεύεται η σύνδεση αυτών με τις εταιρικές εισφορές. Στον κύριο κορμό της διπλωματικής αναλύεται η τριμερή διάκριση των εισφορών της ΙΚΕ και στο τέλος αναλύεται η προστασία των δανειστών αυτής μέσω του υπάρχοντος νομικού πλαισίου.
description: Ιn this thesis, the tripartite distinction of contributions to a private company is being presented, such as capital contribution, out of capital contribution and guarantee contribution as established by the L. 4072/2012 and its individual amendments until today. In the first paragraphs, the general characteristics of the private company and also the connection between private company shares and private’s company’s contributions are being analyzed. In the main body of this dissertation, the tripartite distinction of contributions to a private company is being specified. In the end, the protection of the private’s company’s creditors by the present legal framework is being expertized.
Self-coincidences in higher codimensions
Creators: name: Koschorke, Ulrich
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Topology (math.AT)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 55M20; 55S35; 57R90; 57S15

description: When can a map between manifolds be deformed away from itself? We describe a (normal bordism) obstruction which is often computable and in general much stronger than the classical primary obstruction in cohomology. In particular, it answers our question completely in a large dimension range. As an illustration we give explicit criteria in three sample settings: projections from Stiefel manifolds to Grassmannians, sphere bundle projections and maps defined on spheres. In the first example a theorem of Becker and Schultz concerning the framed bordism class of a compact Lie group plays a central role; our approach yields also a very short geometric proof (included as an appendix) of this result.
Η οριστικοποίηση των πρώτων εγγραφών και το αμάχητο τεκμήριο ακρίβειάς τους
Creators: name: Παπαδοπούλου, Αγγελική Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Κτηματολόγιο
Αμάχητο τεκμήριο
Οριστικοποίηση πρώτων εγγραφών
Land registry
Ιrrebuttable legal presumption
Finalazation of first records/entries

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η παράθεση και διασαφήνιση των ζητημάτων που ανακύπτουν σχετικά με την οριστικοποίηση των πρώτων εγγραφών και το παραγόμενο από αυτή αμάχητο τεκμήριο ακρίβειάς τους. Ειδικότερα, στα πλαίσια της διπλωματικής εργασίας, αρχικά, παρατίθεται η έννοια και νομική φύση των πρώτων εγγραφών καθώς και οι τρόποι διόρθωσης τους όταν αυτές είναι ανακριβείς, μέχρι την οριστικοποίησή τους. Το ενδιαφέρον της εισήγησης επικεντρώνεται κατά το δεύτερο μέρος της, στη διεξοδική ανάλυση του τρόπου οριστικοποίησης των πρώτων εγγραφών και περαιτέρω στην προσέγγιση των υποστηριχθεισών απόψεων σχετικά με την έννοια και νομική φύση του αμάχητου τεκμηρίου ακρίβειάς που παράγεται από την οριστικοποίηση αυτή. Στο τρίτο κεφάλαιο παρατίθεται το σύνολο των εννόμων αποτελεσμάτων που επέρχονται από την παραγωγή του αμάχητου τεκμηρίου, κυρίως ως σε ότι αφορά στις ανακριβείς πρώτες εγγραφές και δη τόσο ως προς τις εμπράγματες αξιώσεις, όσο δε και ως προς το ίδιο το εμπράγματο δικαίωμα του αληθούς δικαιούχου, ο οποίος δεν εμφανίζεται με την ιδιότητά του αυτή στις οριστικές πρώτες εγγραφές. Στο τέταρτο και τελευταίο κεφάλαιο, αναλύεται η έννοια της δημόσιας πίστης στις οριστικοποιημένες πρώτες εγγραφές και τα αντικειμενικά όρια που καταλαμβάνει το αμάχητο τεκμήριο σε αυτές, ενώ ακολουθεί το επίμετρο, στο οποίο παρατίθενται τα βασικά συμπεράσματα της παρούσας διπλωματικής εργασίας.
description: The main purpose of this dissertation is to clarify the issues that arise in the finalization of the first records/entries and the irrebuttable legal presumption that results from this finalization. Initially, the concept and legal nature of the first records/entries are explicated and ways of correcting them when they are inaccurate are provided, until their finalization. The second part of this thesis focuses firstly at the detailed analysis of how to finalize the first records/entries, and secondly at the approach of the supported views on the meaning and legal nature of the irrebuttable legal presumption produced by this finalization. In the third chapter are listed all the legal effects that arise from the irrebuttable legal presumption, particularly at the records/entries that are incorrect and the rights in rem as well as the actual right of the beneficial owner, which does not appear as such in the first definitive entries. In the last chapter the meaning of public confidence is developed in relation to the finalized first records/entries and the limits that the irrebuttable legal presumption have on them.
Signatures of Self-Trapping in the Driven-Dissipative Bose-Hubbard Dimer
Creators: name: Seclì, Matteo
name: Capone, Massimo
name: Schirò, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate signatures of a self-trapping transition in the driven-dissipative Bose Hubbard dimer, in presence of incoherent pump and single-particle losses. For fully symmetric couplings the stationary state density matrix is independent of any Hamiltonian parameter, and cannot therefore capture the competition between hopping-induced delocalization and the interaction-dominated self-trapping regime. We focus instead on the exact quantum dynamics of the particle imbalance after the system is prepared in a variety of initial states, and on the frequency-resolved spectral properties of the steady state, as encoded in the single-particle Green's functions. We find clear signatures of a localization-delocalization crossover as a function of hopping to interaction ratio. We further show that a finite a pump-loss asymmetry restores a delocalization crossover in the steady-state imbalance and leads to a finite intra-dimer dissipation.
description: 16 pages, 12 figures. With respect to version 1 we've added a new section "VIII. Discussion" and we've carried out a minor revision of the other sections
Book Review for "Liberalizing International Trade after Doha: Multilateral"
Creators: name: Malkawi, Bashar H.
Publisher: name: Zenodo
Year: 2019
Subjects: book review
WTO
free trade

description: This is a book for review for the "David Gantz, Liberalizing International Trade after Doha: Multilateral,Plurilateral, Regional, and Unilateral Initiatives".
A search for evidence of irradiation in Centaurus X-4 during quiescence
Creators: name: D'Avanzo, P.
name: Munoz-Darias, T.
name: Casares, J.
name: Martinez-Pais, I. G.
name: Campana, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the neutron star X-Ray Transient Cen X-4. Our aim is to look for any evidence of irradiation of the companion with a detailed analysis of its radial velocity curve, relative contribution of the donor star and Doppler tomography of the main emission lines. To improve our study all our data are compared with a set of simulations that consider different physical parameters of the system, like the disc aperture angle and the mass ratio. We conclude that neither the radial velocity curve nor the orbital variation of the relative donor's contribution to the total flux are affected by irradiation. On the other hand, we do see emission from the donor star at H$α$ and HeI 5876 which we tentatively attribute to irradiation effects. In particular, the H$α$ emission from the companion is clearly asymmetric and we suggest is produced by irradiation from the hot-spot. Finally, from the velocity of the HeI 5876 spot we constrain the disc opening angle to alpha=7-14 deg.
description: 4 pages, 5 figures, accepted for publication in A&A as a RN
Quantum magnetism on small-world networks
Creators: name: Dupont, Maxime
name: Laflorencie, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: While classical spin systems in random networks have been intensively studied, much less is known about quantum magnets in random graphs. Here, we investigate interacting quantum spins on small-world networks, building on mean-field theory and extensive quantum Monte Carlo simulations. Starting from one-dimensional (1D) rings, we consider two situations: all-to-all interacting and long-range interactions randomly added. The effective infinite dimension of the lattice leads to a magnetic ordering at finite temperature $T_\mathrm{c}$ with mean-field criticality. Nevertheless, in contrast to the classical case, we find two distinct power-law behaviors for $T_\mathrm{c}$ versus the average strength of the extra couplings. This is controlled by a competition between a characteristic length scale of the random graph and the thermal correlation length of the underlying 1D system, thus challenging mean-field theories. We also investigate the fate of a gapped 1D spin chain against the small-world effect.
description: 12 pages, 8 figures
An experimental study of intermodulation effects in an atomic fountain frequency standard
Creators: name: Guéna, Jocelyne
name: Dudle, Gregor
name: Thomann, Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The short-term stability of passive atomic frequency standards, especially in pulsed operation, is often limited by local oscillator noise via intermodulation effects. We present an experimental demonstration of the intermodulation effect on the frequency stability of a continuous atomic fountain clock where, under normal operating conditions, it is usually too small to observe. To achieve this, we deliberately degrade the phase stability of the microwave field interrogating the clock transition. We measure the frequency stability of the locked, commercial-grade local oscillator, for two modulation schemes of the microwave field: square-wave phase modulation and square-wave frequency modulation. We observe a degradation of the stability whose dependence with the modulation frequency reproduces the theoretical predictions for the intermodulation effect. In particular no observable degradation occurs when this frequency equals the Ramsey linewidth. Additionally we show that, without added phase noise, the frequency instability presently equal to 2x10-13 at 1s, is limited by atomic shot-noise and therefore could be reduced were the atomic flux increased.
Experimental study of the transport of coherent interacting matter-waves in a 1D random potential induced by laser speckle
Creators: name: Clément, David
name: Varòn, Andrès F.
name: Retter, Jocelyn A.
name: Sanchez-Palencia, Laurent
name: Aspect, Alain
name: Bouyer, Philippe
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a detailed analysis of the 1D expansion of a coherent interacting matterwave (a Bose-Einstein condensate) in the presence of disorder. A 1D random potential is created via laser speckle patterns. It is carefully calibrated and the self-averaging properties of our experimental system are discussed. We observe the suppression of the transport of the BEC in the random potential. We discuss the scenario of disorder-induced trapping taking into account the radial extension in our experimental 3D BEC and we compare our experimental results with the theoretical predictions.
Magnification of spin Hall effect in bilayer electron gas
Creators: name: Jin, Pei-Qing
name: Li, You-Quan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Spin transport properties of a coupled bilayer electron gas with Rashba spin-orbit coupling are studied. The definition of the spin currents in each layer as well as the corresponding continuity-like equations in the bilayer system are given. The curves of the spin Hall conductivities obtained in each layer exhibit sharp cusps around a particular value of the tunnelling strength and the conductivities undergo sign changes across this point. Our investigation on the impurity effect manifests that an arbitrarily small concentration of nonmagnetic impurities does not suppress the spin Hall conductivity to zero in the bilayer system. Based on these features, an experimental scheme is suggested to detect a magnification of the spin Hall effect.
description: Revtex 10 pages, 4 figures; largely extended version
Finding a second Sun - How can we detect solar-like magnetic cycles with Zeeman-Doppler-Imaging (ZDI)?
Creators: name: Lehmann, Lisa Theres
name: Hussain, Gaitee A. J.
name: Vidotto, Aline A.
name: Jardine, Moira M.
name: Mackay, Duncan H.
Publisher: name: Zenodo
Year: 2021
Subjects: The Sun and the Heliosphere
Cool Stars on the main sequence

description: Spectropolarimetric surveys have now been running for long enough to reveal solar-like magnetic activity cycles, e.g., for 61 Cyg A (Boko Saikia et al. 2018). Our work examines if a solar-like cycle can be observed with ZDI, given that this technique only detects the large-scale field for very slowly-rotating and low-activity stars like our Sun. We aim to determine the best strategy to detect stellar cycles, and which parameters are most sensitive to cycle changes. This poster presents our paper: Lehmann, L. T., et al., 2021, MNRAS, 500, 1243
 (https://ui.adsabs.harvard.edu/abs/2021MNRAS.500.1243L)
description: LTL acknowledges support from the Scottish Universities Physics Alliance (SUPA) prize studentship and the University of St Andrews Higgs studentship. LTL and GH would like to thank the ESO Directorate for Science, which provided funds to support this collaboration. GH also warmly thanks the IDEX initiative at Université Federale Toulouse Midi-Pyrenees (UFTMiP) for funding the STEPS collaboration program between IRAP/OMP and ESO.
description: {"references": ["Boro Saikia S., et al., 2018, A&A, 620, L11", "Lehmann L. T., Hussain G. A. J., Jardine M. M., Mackay D. H., Vidotto A. A., 2019, MNRAS, 483, 5246", "Yeates A. R., Mackay D. H., 2012, ApJ, 753, L34"]}
PHANGS-HST: New Methods for Star Cluster Identification in Nearby Galaxies
Creators: name: Thilker, David A.
name: Whitmore, Bradley C.
name: Lee, Janice C.
name: Deger, Sinan
name: Chandar, Rupali
name: Larson, Kirsten L.
name: Hannon, Stephen
name: Ubeda, Leonardo
name: Dale, Daniel A.
name: Glover, Simon C. O.
name: Grasha, Kathryn
name: Klessen, Ralf S.
name: Kruijssen, J. M. Diederik
name: Rosolowsky, Erik
name: Schruba, Andreas
name: White, Richard L.
name: Williams, Thomas G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an innovative and widely applicable approach for the detection and classification of stellar clusters, developed for the PHANGS-HST Treasury Program, an $NUV$-to-$I$ band imaging campaign of 38 spiral galaxies. Our pipeline first generates a unified master source list for stars and candidate clusters, to enable a self-consistent inventory of all star formation products. To distinguish cluster candidates from stars, we introduce the Multiple Concentration Index (MCI) parameter, and measure inner and outer MCIs to probe morphology in more detail than with a single, standard concentration index (CI). We improve upon cluster candidate selection, jointly basing our criteria on expectations for MCI derived from synthetic cluster populations and existing cluster catalogues, yielding model and semi-empirical selection regions (respectively). Selection purity (confirmed clusters versus candidates, assessed via human-based classification) is high (up to 70$\%$) for moderately luminous sources in the semi-empirical selection region, and somewhat lower overall (outside the region or fainter). The number of candidates rises steeply with decreasing luminosity, but pipeline-integrated Machine Learning (ML) classification prevents this from being problematic. We quantify the performance of our PHANGS-HST methods in comparison to LEGUS for a sample of four galaxies in common to both surveys, finding overall agreement with $50-75\%$ of human verified star clusters appearing in both catalogues, but also subtle differences attributable to specific choices adopted by each project. The PHANGS-HST ML-classified Class 1 or 2 catalogues reach $\sim1$ magnitude fainter, $\sim2\times$ lower stellar mass, and are $2{-}5\times$ larger in number, than attained in the human classified samples.
description: 36 pages, 18 figures, updated to v2, accepted to MNRAS
Estimation of time delays from unresolved photometry
Creators: name: Hirv, A.
name: Eenmäe, T.
name: Liimets, T.
name: Liivamägi, L. J.
name: Pelt, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Longtime monitoring of gravitational lens systems is often done using telescopes and recording equipment with modest resolution. Still, it would be interesting to get as much information as possible from the measured lightcurves. From high resolution images we know that the recorded quasar images are often blends and that the corresponding time series are not pure shifted replicas of the source variability. In this paper we will develop an algorithm to unscramble this kind of blended data. The proposed method is based on a simple idea. We use one of the photometric curves, which is supposedly a simple shifted replica of the source curve, to build different artificial combined curves. Then we compare these artificial curves with the blended curves. Proper solutions for a full set of time delays are then obtained by varying free input parameters and estimating statistical distances between the artificial and blended curves. We performed a check of feasibility and applicability of the new algorithm. For numerically generated data sets the time delay systems were recovered for a wide range of setups. Application of the new algorithm to the classical double quasar QSO 0957+561 A,B lightcurves shows a clear splitting of one of the images. This is an unexpected result and extremely interesting, especially in the context of the recent controversy about the exact time delay value for the system. The proposed method allows us to properly analyse the data from low resolution observations that have long time coverages. There are a number of gravitational lens monitoring programmes that can make use of the new algorithm.
description: Accepted by A&A, 8 pages, 11 figures; added references, corrected typos
Semi-Empirical Analyses of Alfvén Wave-Driven Winds from Red Giants and Supergiants
Creators: name: Harper, Graham M
Publisher: name: Zenodo
Year: 2021
Subjects: Post main sequence cool stars

description: We present a synopsis of ongoing projects that are analyzing the properties of outflows (winds) from cool evolved non-dusty stars with spectral-types K through mid-M. These projects include: (1) A semi-empirical study of the inferred Alfvén wave properties required to drive the rapidly accelerating winds from single red giants, and the more gradual acceleration of the eclipsing binary zeta Aurigae (K4 Ib + B5 V). The results includes a revision of previous published radial dependent damping lengths. (2) The first determination of the outflow radial gradients of the gas temperature and turbulence in Arcturus (alpha Boo: K1.5 III) and Aldebaran (alpha Tau: K5 III) based on radiative transfer modeling of HST-STIS emission line profiles, including a new significantly reduced mass-loss rate for alpha Boo. (3) A novel semi-empirical mass-loss rate expression for K through mid-M red supergiants based on optically thin 17.94\,$\mu$m [Fe II] emission line fluxes collected with TEXES at the NASA-IRTF. This approach is based on a dominant ionization state within the base of the wind and it has the potential to overcome the limitations of CO and dust estimates because these are not fully associated in warm supergiant winds.
description: Support for program numbers HST-AR-14566-001-A, HST-GO-14731-001-A, and HST-GO-15234.001-A was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. The TEXES spectra were obtained at the Infrared Telescope Facility, which is operated by the University of Hawaii under contract 80HQTR19D0030 with the National Aeronautics and Space Administration.
Teachers' knowledge and beliefs about dyslexia and dyslectic students: A study within the EFL context in the state sector of Greece
Creators: name: Πολλάλη, Χριστίνα-Στυλιανή Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Δυσλεξία
Γνώσεις εκπαιδευτικών
Απόψεις εκπαιδευτικών
Dyslexia
Teachers’ knowledge
Teachers’ beliefs

description: The main focus of the present paper is on teachers’ knowledge and beliefs towards dyslexia and dyslectic students in Greece and to what extent postgraduate studies have contributed to their shaping. This study used seventy-five (n=75) Greek teachers of English who are employed in the state sector. The data was collected through an online questionnaire and two semi-structured interviews. The questionnaire included questions about teachers’ knowledge and self-perception of knowledge of dyslexia, the factors that impede them from teaching dyslectic students and the beliefs they have about them. Results indicated that a great number of English teachers have several common misconceptions about dyslexia and this is evident in their self-perception and in the factors that refrain them from effective teaching. The study finally revealed that the teachers’ beliefs are controversial and that postgraduate studies influence mostly them rather than their knowledge. The paper aims to explore in depth the aforementioned issues, suggest some possible explanations for the outcomes and discuss the implications that are derived from the results.
description: Η παρούσα έρευνα εστιάζει στη μελέτη των γνώσεων και των απόψεων των εκπαιδευτικών σχετικά με τη δυσλεξία και τους μαθητές με δυσλεξία και κατά πόσο οι μεταπτυχιακές σπουδές τους τούς έχουν επηρεάσει. 75 Έλληνες καθηγητές Αγγλικής Γλώσσας που δουλεύουν στη δημόσια πρωτοβάθμια και δευτεροβάθμια εκπαίδευση της χώρας ήταν το δείγμα της έρευνας. Τα εργαλεία συλλογής δεδομένων ήταν ένα ερωτηματολόγιο που διανεμήθηκε ηλεκτρονικά και δύο ημι-δομημένες συνεντεύξεις. Το ερωτηματολόγιο περιείχε ερωτήσεις σχετικά με τις γνώσεις και την αυτοαντίληψη των εκπαιδευτικών όσον αφορά τη δυσλεξία, τους παράγοντες που τους εμποδίζουν να διδάξουν μαθητές με δυσλεξία και τις απόψεις που έχουν για εκείνους. Τα αποτελέσματα έδειξαν ότι αρκετοί εκπαιδευτικοί Αγγλικής Γλώσσας έχουν κοινές παρανοήσεις σχετικά με τη δυσλεξία και αυτό γίνεται εμφανές τόσο στην αυτοαντίληψη που έχουν όσο και στους παράγοντες που τους παρεμποδίζουν από μια επιτυχή διδασκαλία. Τέλος, έγινε φανερό ότι οι απόψεις των εκπαιδευτικών σχετικά με τους μαθητές με δυσλεξία είναι αμφιλεγόμενες και ότι οι μεταπτυχιακές σπουδές επηρεάζουν σε μεγαλύτερο βαθμό τις απόψεις τους και όχι τις γνώσεις τους. Σκοπός της έρευνας είναι να διερευνηθούν τα προαναφερθέντα ζητήματα, να προταθούν και να συζητηθούν πιθανές αιτίες για τα αποτελέσματα.
Uncovering Interpretable Internal States of Merging Tasks at Highway On-Ramps for Autonomous Driving Decision-Making
Creators: name: Wang, Huanjie
name: Wang, Wenshuo
name: Yuan, Shihua
name: Li, Xueyuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Humans make daily routine decisions based on their internal states in intricate interaction scenarios. This paper presents a probabilistically reconstructive learning approach to identify the internal states of multi-vehicle sequential interactions when merging at highway on-ramps. We treated the merging task's sequential decision as a dynamic, stochastic process and then integrated the internal states into an HMM-GMR model, a probabilistic combination of an extended Gaussian mixture regression (GMR) and hidden Markov models (HMM). We also developed a variant expectation-maximum (EM) algorithm to estimate the model parameters and verified it based on a real-world data set. Experiment results reveal that three interpretable internal states can semantically describe the interactive merge procedure at highway on-ramps. This finding provides a basis to develop an efficient model-based decision-making algorithm for autonomous vehicles (AVs) in a partially observable environment.
description: 12 pages, 9 figures
The Bedwyr system for model checking over syntactic expressions
Creators: name: Baelde, David
name: Gacek, Andrew
name: Miller, Dale
name: Nadathur, Gopalan
name: Tiu, Alwen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Bedwyr is a generalization of logic programming that allows model checking directly on syntactic expressions possibly containing bindings. This system, written in OCaml, is a direct implementation of two recent advances in the theory of proof search. The first is centered on the fact that both finite success and finite failure can be captured in the sequent calculus by incorporating inference rules for definitions that allow fixed points to be explored. As a result, proof search in such a sequent calculus can capture simple model checking problems as well as may and must behavior in operational semantics. The second is that higher-order abstract syntax is directly supported using term-level $λ$-binders and the $\nabla$ quantifier. These features allow reasoning directly on expressions containing bound variables.
description: 6 page system description. Appeared in CADE 2007
LHC-ILC synergy
Creators: name: Godbole, Rohini M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I will begin by making a few general comments on the synergy between the Large Hadron Collider (LHC) which will go in action in 2007 and the International Linear Collider (ILC) which is under planning. I will then focus on the synergy between the LHC and the PLC option at the ILC, which is expected to be realised in the later stages of the ILC program. In this I will cover the possible synergy in the Higgs sector (with and without CP violation), in the determination of the anomalous vector boson couplings and last but not the least, in the search for extra dimensions and radions.
description: 12 pages,8 figures, uses appolb.cls, talk presented at the PLC2005 workshop, Kazimierz, Poland, 5-8 September, to appear in Acta Physics Polonica