cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The utilization of critical thinking "tools" in social studies by grade 9 girls
Creators: name: Moore, Deirdre Jane
Publisher: name: University of British Columbia
Year: 2009

description: This qualitative study describes, interprets and offers an evaluation of how 13 and 14 year-old girls utilize the critical thinking 'tools' of the conception of critical thinking put forward by Sharon Bailin, Roland Case, Jerrold Coombs and Le Roi Daniels in 1993. Tools include background knowledge, strategies, concepts, criteria for judgement, and attitudes. Eight girls enrolled in grade 9 social studies were observed, audiotaped and videotaped while completing a critical challenge prior to and after a month long social studies unit on the Industrial Revolution which involved instruction in critical thinking. The girls were of a variety of backgrounds, and were receiving between C+ and A letter grades in their social studies course. The critical challenges required the participants to write fairminded accounts of particular historical topics; the first challenge focussed on the French Revolution, while the second topic centred on the Industrial Revolution. Each girl was interviewed regarding her experiences. Results demonstrate that the conception is applicable to the utilization of the tools of critical thinking by girls. Secondly, findings show that there is no set procedure or apparent order, nor specific combinations of tools utilized in order to complete critical challenges. Background knowledge is used in an integrated fashion with all of the other thinking tools. The research findings also suggest that the attitudes explicated in the conception are conducive to critical thinking; these attitudes were not applied consistently or consciously by the participants. The study shows that criteria for judgement are the tools which are the least understood and utilized by the girls in their critical thinking. The girls' thinking demonstrated some 'feminine' elements of thinking. In addition, some evidence pointed to the level of confidence of the girls playing a role in the direction and depth of their thinking. These findings can be used to guide teachers and educational policymakers in the creation of subject curricula, teaching resources, classroom experiences, and assessment measures.
Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, May 17, 1943
Creators: name: Trustees Of The Winfield And Okanagan Centre Irrigation District
Publisher: name: The University of British Columbia
Year: 2017

description: Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, dated May 17, 1943, regarding Crooked Lake dam.
The Remarkable Afterglow of GRB 061007: Implications for Optical Flashes and GRB Fireballs
Creators: name: Mundell, C. G.
name: Melandri, A.
name: Guidorzi, C.
name: Kobayashi, S.
name: Steele, I. A.
name: Malesani, D.
name: Amati, L.
name: D'Avanzo, P.
name: Bersier, D. F.
name: Gomboc, A.
name: Rol, E.
name: Bode, M. F.
name: Carter, D.
name: Mottram, C. J.
name: Monfardini, A.
name: Smith, R. J.
name: Malhotra, S.
name: Wang, J.
name: Bannister, N.
name: O'Brien, P. T.
name: Tanvir, N. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a multiwavelength analysis of Swift GRB 061007. The 2-m robotic Faulkes Telescope South (FTS) began observing 137 s after the onset of the gamma-ray emission, when the optical counterpart was already decaying from R 10.3 mag, and continued observing for the next 5.5 hours. These observations begin during the final gamma-ray flare and continue through and beyond a long, soft tail of gamma-ray emission whose flux shows an underlying simple power-law decay identical to that seen at optical and X-ray wavelengths, with temporal slope alpha 1.7 This remarkably simple decay in all of these bands is rare for Swift bursts, which often show much more complex light curves. We suggest the afterglow emission begins as early as 30-100 s and is contemporaneous with the on-going variable prompt emission from the central engine, but originates from a physically distinct region dominated by the forward shock. The afterglow continues unabated until at least 10^5 s showing no evidence of a break. The observed multiwavelength evolution of GRB 061007 is explained by an expanding fireball whose optical, X-ray and late-time gamma-ray emission is dominated by emission from a forward shock with typical synchrotron frequency, nu_m, that is already below the optical band as early as t=137 s and a cooling frequency, nu_c, above the X-ray band to at least t=10^5 s. In contrast, the typical frequency of the reverse shock lies in the radio band at early time. We suggest that the unexpected lack of bright optical flashes from the majority of Swift GRBs may be explained with a low nu_m originating from small microphysics parameters, epsilon_e and epsilon_B. (Abridged)
description: Accepted for publication in ApJ; 23 pages including 3 tables and 3 figures; minor amendements
Growth of Perturbations using Lambert$W$ Equation of State
Creators: name: Banerjee, Manisha
name: Das, Sudipta
name: Mamon, Abdulla Al
name: Saha, Subhajit
name: Bamba, Kazuharu
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recently, a novel equation of state (EoS) parameter for dark energy has been introduced which deals with a special mathematical function, known as the Lambert$W$ function. In this paper, we study the effect on the growth of perturbations for the Lambert$W$ dark energy model. We perform the analysis for two different approaches. In the first case we consider the universe to be filled with two different fluid components, namely, the baryonic matter component and the Lambert$W$ dark energy component, while in the second case we consider that there is a single fluid component in the universe whose equation of state parameter is described by the Lambert$W$ function. We then compare the growth rates of Lambert$W$ model with that for a standard $Λ$CDM model as well as the CPL model. Our results indicate that the presence of Lambert$W$ dynamical dark energy sector changes the growth rate and affects the matter fluctuations in the universe to a great extent.
description: 6 pages, 8 figures
Αρχαία ελληνική τραγωδία και κόμικς : από τη σκηνή στο χαρτί: η χάρτινη Αντιγόνη
Creators: name: Μυλωνά, Αλεξάνδρα Πολύβιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Αντιγόνη
Τραγωδία
Εικονογραφήματα
Κόμικς
Antigone
Tragedy
Comics
BDs
Graphic novels

description: Θέμα της διπλωματικής εργασίας αποτελεί η μεταγραφή της σοφόκλειας τραγωδίας Αντιγόνη από τους Τάσο Αποστολίδη και Κώστα Αρώνη στο εικοναφήγημα Σοφοκλή Αντιγόνη (Μεταίχμιο, 2006), η μελέτη της οποίας στηρίζεται κυρίως στη σύγκριση των δύο δραματουργιών σε δομή, παρουσίαση και δράση προσώπων, διαχείριση χώρου και χρόνου, αξιοποιούμενες κινηματογραφικές, λογοτεχνικές, ζωγραφικές και γραφιστικές τεχνικές και, γενικότερα, σκηνοθετικές λύσεις. Τα συμπεράσματα αποκαλύπτουν την ερμηνευτική προσέγγιση των εικοναφηγητών και το πώς οι επιλογές τους εξυπηρετήθηκαν από και υποστήριξαν τον κώδικα των κόμικς. Η εργασία περιλαμβάνει επίσης ευσύνοπτη αναφορά στην τέχνη των κόμικς και την ιστορία τους (διεθνώς και στην Ελλάδα), αλλά και σύντομη παρουσίαση της προγενέστερης Αντιγόνης των Κλασσικών Εικονογραφημένων με εντοπισμό των ομοιοτήτων και διαφορών ανάμεσά τους.
description: The MA thesis studies the transcription of Sophocles’ Antigone by Tasos Apostolides and Kostas Aronis into comics (Sophocles’ Antigone, Mεταίχμιο, Αθηνα, 2006), through a comparison of the two works in terms of structure, presentation and action of characters, management of space and time. The conclusions reveal the interpretative approach of the comics creators as well as how their choices at the same time conformed and were served by the code of comics. The thesis includes a succinct review of the art of comics and their history (both in Greece and abroad) as well as a brief presentation of the earlier Antigone by Classics Illustrated with reference to both the similarities and differences between the two works.
The First Stellar Parallaxes Revisited
Creators: name: Reid, Mark J.
name: Menten, Karl M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We have re-analyzed the data used by Bessel, von Struve, and Henderson in the 1830s to measure the first parallax distances to stars. We can generally reproduce their results, although we find that von Struve and Henderson have underestimated some of their measurement errors, leading to optimistic parallax uncertainties. We find that temperature corrections for Bessel's measured positions are larger than anticipated, explaining some systematics apparent in his data. It has long been a mystery as to why von Struve first announced a parallax for Vega of 0.125 arcsec, only later with more data to revise it to double that value. We resolve this mystery by finding that von Struve's early result used two dimensions of position data, which independently give significantly different parallaxes, but when combined only fortuitously give the correct result. With later data, von Struve excluded the "problematic" dimension, leading to the larger parallax value. Allowing for likely temperature corrections, and using his data from both dimensions, reduces von Struve's parallax for Vega to a value consistent with the correct value.
description: To appear in Astronomische Nachrichten. 10 pages; 5 figures; 4 tables
Statistical Properties of the Inter-occurrence Times in the Two-dimensional Stick-slip Model of Earthquakes
Creators: name: Hasumi, Tomohiro
name: Aizawa, Yoji
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study earthquake interval time statistics, paying special attention to inter-occurrence times in the two-dimensional (2D) stick-slip (block-slider) model. Inter-occurrence times are the time interval between successive earthquakes on all faults in a region. We select stiffness and friction parameters as tunable parameters because these physical quantities are considered as essential factors in describing fault dynamics. It is found that inter-occurrence time statistics depend on the parameters. Varying stiffness and friction parameters systematically, we optimize these parameters so as to reproduce the inter-occurrence time statistics in natural seismicity. For an optimal case, earthquakes produced by the model obey the Gutenberg-Richter law, which states that the magnitude-frequency distribution exhibits the power law with an exponent approximately unity.
description: 8 pages, 5 figures, contribution to the conference proceeding of 21COE International Symposium, Tokyo, Japan Sept 13-14 2007
Lunar Cratering Asymmetries with High Orbital Obliquity and Inclination of the Moon
Creators: name: Li, Huacheng
name: Zhang, Nan
name: Yue, Zongyu
name: Zhang, Yizhuo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Accurate estimation of cratering asymmetry on the Moon is crucial for understanding Moon evolution history. Early studies of cratering asymmetry have omitted the contributions of high lunar obliquity and inclination. Here, we include lunar obliquity and inclination as new controlling variables to derive the cratering rate spatial variation as a function of longitude and latitude. With examining the influence of lunar obliquity and inclination on the asteroids population encountered by the Moon, we then have derived general formulas of the cratering rate spatial variation based on the crater scaling law. Our formulas with addition of lunar obliquity and inclination can reproduce the lunar cratering rate asymmetry at the current Earth-Moon distance and predict the apex/ant-apex ratio and the pole/equator ratio of this lunar cratering rate to be 1.36 and 0.87, respectively. The apex/ant-apex ratio is decreasing as the obliquity and inclination increasing. Combining with the evolution of lunar obliquity and inclination, our model shows that the apex/ant-apex ratio does not monotonically decrease with Earth-Moon distance and hence the influences of obliquity and inclination are not negligible on evolution of apex/ant-apex ratio. This model is generalizable to other planets and moons, especially for different spin-orbit resonances.
description: 18 pages, 7 figures
Overview of Charm Physics at RHIC
Creators: name: Leitch, M. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Heavy-quark production provides a sensitive probe of the gluon structure of nucleons and its modication in nuclei. It is also a key probe of the hot-dense matter created in heavy-ion collisions. We will discuss the physics issues involved, as seen in quarkonia and open heavy-quark production, starting with those observed in proton-proton collisions. Then cold nuclear matter effects on heavy-quark production including shadowing, gluon saturation, energy loss and absorption will be reviewed in the context of recent proton-nucleus and deuteron-nucleus measurements. Next we survey the most recent measurements of open-charm and J/Psi's in heavy-ion collisions at RHIC and their interpretation. We discuss the high-pT suppression and flow of open charm in terms of energy loss and thermalization and, for J/Psi, contrast explanations in terms of screening in a deconfined medium vs. recombination models.
description: 6 pages, 12 figures, proceedings for Quark Confinement and Hadron Spectrum VII
The rotation rate of solar active and ephemeral regions -- I. Dependence on morphology and peak magnetic flux
Creators: name: Kutsenko, Alexander S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using magnetic field maps acquired by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory we measured rotation rates of 864 active and 322 ephemeral regions observed between 2010 and 2016. We found smaller magnetic tracers to show a tendency to rotate faster as compared to larger ones. Thus, ephemeral regions exhibit on average the fastest rotation rate. We further divided active regions into three classes. Class A comprised magnetic bipoles obeying Hale's polarity law, Joy's law, and exhibiting more coherent leading polarity in comparison with the following one. The second class B included active regions violating at least one of the aforementioned empirical laws. The third class U comprised unipolar active regions. We found no significant difference between the rotation rates of active regions of classes A and B. In contrast, unipolar active regions exhibited on average lower rotation rate and narrower distribution of the rotation rate differences. Assuming the rotation rate to indicate the anchoring depth of the magnetic structure within the convection zone, we supposed that active regions of classes A and B might be anchored throughout the entire convective envelope while unipolar active regions a rooted within a thin layer located either near the base of the convection zone or at a shallow near-surface depth.
The gluon and ghost propagators in Euclidean Yang-Mills theory in the maximal Abelian gauge: taking into account the effects of the Gribov copies and of the dimension two condensates
Creators: name: Capri, M. A. L.
name: Lemes, V. E. R.
name: Sobreiro, R. F.
name: Sorella, S. P.
name: Thibes, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The infrared behavior of the gluon and ghost propagators is studied in SU(2) Euclidean Yang-Mills theory in the maximal Abelian gauge within the Gribov-Zwanziger framework. The nonperturbative effects associated with the Gribov copies and with the dimension two condensates are simultaneously encoded into a local and renormalizable Lagrangian. The resulting behavior turns out to be in good agreement with the lattice data.
description: final version, to appear in Physical Review D
Sampling diffusive transition paths
Creators: name: Miller, Thomas F.
name: Predescu, Cristian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We address the problem of sampling double-ended diffusive paths. The ensemble of paths is expressed using a symmetric version of the Onsager-Machlup formula, which only requires evaluation of the force field and which, upon direct time discretization, gives rise to a symmetric integrator that is accurate to second order. Efficiently sampling this ensemble requires avoiding the well-known stiffness problem associated with sampling infinitesimal Brownian increments of the path, as well as a different type of stiffness associated with sampling the coarse features of long paths. The fine-feature sampling stiffness is eliminated with the use of the fast sampling algorithm (FSA), and the coarse-feature sampling stiffness is avoided by introducing the sliding and sampling (S&S) algorithm. A key feature of the S&S algorithm is that it enables massively parallel computers to sample diffusive trajectories that are long in time. We use the algorithm to sample the transition path ensemble for the structural interconversion of the 38-atom Lennard-Jones cluster at low temperature.
description: 13 pages 5 figures
How the Design of YouTube Influences User Sense of Agency
Creators: name: Lukoff, Kai
name: Lyngs, Ulrik
name: Zade, Himanshu
name: Liao, J. Vera
name: Choi, James
name: Fan, Kaiyue
name: Munson, Sean A.
name: Hiniker, Alexis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: In the attention economy, video apps employ design mechanisms like autoplay that exploit psychological vulnerabilities to maximize watch time. Consequently, many people feel a lack of agency over their app use, which is linked to negative life effects such as loss of sleep. Prior design research has innovated external mechanisms that police multiple apps, such as lockout timers. In this work, we shift the focus to how the internal mechanisms of an app can support user agency, taking the popular YouTube mobile app as a test case. From a survey of 120 U.S. users, we find that autoplay and recommendations primarily undermine sense of agency, while search and playlists support it. From 13 co-design sessions, we find that when users have a specific intention for how they want to use YouTube they prefer interfaces that support greater agency. We discuss implications for how designers can help users reclaim a sense of agency over their media use.
description: 14 pages, 3 figures, Forthcoming at the CHI 2021 Conference
Παιδική ηλικία και ελεύθερος χρόνος στα καινούρια βιβλία της γλώσσας του Δημοτικού Σχολείου:
Creators: name: Λεοντάκη, Βασιλική Μιλτιάδη
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Γλωσσικά εγχειρίδια
Παιδική ηλικία
Ελεύθερος χρόνος
Σχολικό εγχειρίδιο
Νεοσυντηρητικές πολιτικές
Επικοινωνιακή προσέγγιση της γλώσσας
School handbooks
Linguistic handbooks
Childhood
Free time
School policies

description: Η εργασία αυτή κλήθηκε να καλύψει το ερευνητικό κενό που διαπιστώθηκε, μετά από έρευνα των παιδαγωγικών περιοδικών από το 1982 ως το 2008, αναφορικά με τη μελέτη της παιδικής ηλικίας και του ελεύθερου χρόνου στα βιβλία της γλώσσας του Δημοτικού σχολείου. Μια τέτοια έρευνα βασίζεται, καταρχήν, στην αποσαφήνιση βασικών θεωρητικών παραμέτρων. Η σημασία του σχολικού εγχειριδίου διαχρονικά, αλλά και η εξέλιξη των εγχειριδίων της γλώσσας, μας βοηθούν να κατανοήσουμε καλύτερα τις κοινωνικές και ιστορικές συνθήκες κάτω από τις οποίες διαμορφώθηκαν τα νέα γλωσσικά εγχειρίδια που κυκλοφόρησαν το σχολικό έτος 2006-2007. Επιπλέον, προσεγγίστηκε θεωρητικά η έννοια της παιδικής ηλικίας, καθώς και του ελεύθερου χρόνου, προκειμένου να αναζητηθούν οι αναφορές των εννοιών αυτών στα γλωσσικά εγχειρίδια. Στη συνέχεια, επιλέχθηκε ως μέθοδο ανάλυσης του υλικού η θεματική ανάλυση περιεχομένου. Στα συμπεράσματα, λοιπόν, ο συνδυασμός βασικών στοιχείων της θεωρητικής συζήτησης και των αποτελεσμάτων της ανάλυσης αξιοποιείται για την κατανόηση του περιεχομένου των κειμένων των νέων γλωσσικών εγχειριδίων αναφορικά με την παιδική ηλικία και τον ελεύθερο χρόνο.
description: This work was called to cover the inquiring void that was realised, after researching This work was called to cover the inquiring void that was realised, after researching the pedagogic magazines from 1982 until 2008, in regard to the study of childhood and free time in the linguistic handbooks of Municipal school. Such research is based, firstly, on the clarification of basic theoretical elements. The importance of school handbook diachronically, and the development of linguistic handbooks, helped us comprehend social and historical conditions under which were shaped the new linguistic handbooks that circulated at the school year 2006-2007. Moreover, we approached theoretically the significance ofchildhood , as well as free time, so that we can search the reports of these categories in the linguistic handbooks. Afterwards, it was selected as method of a the material the thematic analysis of content. In the conclusions, therefore, the combination of basic elements of theoretical discussion and results of analysis was developed for the comprehension of content of texts of new linguistic handbooks in regard to the childhood and the free time.
Crystal growth and ambient and high pressure study of the reentrant superconductor Tm_2Fe_3Si_5
Creators: name: Singh, Yogesh
name: Ramakrishnan, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report single crystal growth of the reentrant superconductor Tm_2Fe_3Si_5, and measurements of the anisotropic static magnetic susceptibility χ(T) and isothermal magnetization M(H), ac susceptibility χ_ac(T), electrical resistivity ρ(T) and heat capacity C(T) at ambient pressure and χ_ac(T) at high pressure. The magnetic susceptibility along the c-axis χ_c(T) shows a small maximum around 250 K and does not follow the Curie-Weiss behavior while the magnetic susceptibility along the a-axis χ_a(T) follows a Curie-Weiss behavior between 130 K and 300 K with a Weiss temperature θand an effective magnetic moment μ_eff which depend on the temperature range of the fit. The easy axis of magnetization is perpendicular to the c-axis and χ_a/χ_c = 3.2 at 1.8 K. The ambient pressure χ_ac(T) and C(T) measurements confirm bulk antiferromagnetic ordering at T_N = 1.1 K. The sharp drop in χ_ac below T_N is suggestive of the existence of a spin-gap. We observe superconductivity only under applied pressures P\geq 2 kbar. The temperature-pressure phase diagram showing the non-monotonic dependence of the superconducting transition temperature T_c on pressure P is presented.
description: 7 pages, 8 figures
Διαπραγμάτευση μεταξύ ευφυών πρακτόρων λογισμικού στο περιβάλλον του σημασιολογικού ιστού
Creators: name: Κράβαρη, Καλλιόπη Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Ευφυείς πράκτορες
Σημασιολογικός ιστός
Διαπραγμάτευση
Αναιρέσιμη συλλογιστική
Σύστημα DR-Device
Intelligent agents
Semantic web
Negotiation
Defeasible logic
DR-Device system

description: Στην παρούσα διπλωματική εργασία γίνεται μελέτη του σημασιολογικού ιστού και των ευφυών πρακτόρων. Δημιουργείται μια υπηρεσία αναιρέσιμης συλλογιστικής για τον σημασιολογικό ιστό. Επιπλέον, παρουσιάστηκε ένα πολυ-πρακτορικό σύστημα, στο οποίο γίνεται διαπραγμάτευση μεταξύ των ευφυών πρακτόρων σε ένα συγκεκριμένο σενάριο, συγκεκριμένα διαπραγμάτευση μεταξύ τριών ανεξάρτητων μερών για την ενοικίαση διαμερίσματος.
description: This paper studies bothsemantic web and intelligent agents. A defeasible reasoning service is implemented in the environment of semantic web. Moreover, a multi-agent system is represented, its special implementation is a negotiation between three independent parties for apartment rental.
The role of oral language in the practicum classroom
Creators: name: Derksen, Harold Kenneth
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to investigate the praxis (theory and practice) of oral language by student teachers during their practicum. Specifically, this study identified and described the factors which 13 British Columbia student teachers perceived of as affecting the establishment of an orally interactive environment within their practicum classroom. Through the analysis of dialogue journals, interviews, and questionnaires, 24 factors in 5 categories were identified and described that affect the development of orally interactive teaching. The factors were grouped into categories of knowledge, position, expectations, structures, and assumptions. This study concludes that the identification of factors affecting orality in the practicum can assist teacher education programs and teachers to more effectively address the potential of orality as a medium for negotiation and meaning making in the classroom.
Microwave Sintering of Alumina at 915 MHz: Modeling, Process Control, and Microstructure Distribution
Creators: name: Marinel, Sylvain
name: Manière, Charles
name: Bilot, Anthony
name: Bilot, Christelle
name: Harnois, Christelle
name: Riquet, Guillaume
name: Valdivieso, François
name: Meunier, Christophe
name: Coureau, Christophe
name: Barthélemy, François
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Microwave energy can be advantageously used for materials processing as it provides high heating rates and homogeneous temperature field distribution. These features are partly due to the large microwave penetration depth into dielectric materials which is, at room temperature, a few centimeters in most dielectric materials. However, up to now, this technology is not widely spread for high-temperature materials processing applications (>1200{\textdegree}C), because its reproducibly and ability to sinter large size samples (>30 cm 3) still needs to be improved. In this context, this paper describes both an empirically designed 915 MHz single-mode cavity made from SiC susceptors and refractory thermal insulation, and the 3 D modeling of the process in order to improve our understanding of it. Different susceptors geometries and coupling slit position were numerically tested in order to better understand how these parameters impact the field homogeneity and the process stability. It was found that positioning the largest surface of the susceptors parallel to the electrical field allows a very uniform and hybrid heating of the material, while avoiding plasma or thermal instabilities. This was correlated to the 3 D modeling results. Finally, thanks to a fully automatized system this apparatus was used to sinter large size (~30 cm 3) low-loss dielectric alumina samples. The sintered materials were subsequently characterized in terms of density, grains size distribution and homogeneity. The reproducibility was also discussed demonstrating the process efficiency and reliability.
Επικοινωνία και δημόσιος χώρος: η συζήτηση για το παράδειγμα του ευρωπαϊκού συντάγματος
Creators: name: Γιαβρίδης, Φώτιος Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Επικοινωνία
Δημόσιος χώρος
Ευρωπαϊκό σύνταγμα
Πρόταση επίλυσης
Κοινωνία και πολιτική
Σύγχρονη αντίληψη
Communication
Public space
European constitution
Proposition of solution
Society and politics
Modern conception

description: Με βάση τις θεωρήσεις στοχαστών όπως ο Κάντ και κυρίως ο χάμπεραμας, προβάλλεται η δυνητικά χρηστική αξία της επικοινωνίας και του δημόσιου χώρου ως πεδία δράσης, ιδιαίτερα όωμς η αυτενέργειά τους ως εργαλείων για την παραγωγή πολιτικής. Μέσα απο μια ριζοσπαστικής απόχρωσης εισδοχή της κοινωνίας στην πολιτική πραγματικότητα, προτείνεται η λύση του επίμαχου ζητήματος του Ευρωπαϊκού Συντάγματος μέσω της συναλλαγής και συνυποχρέωσης των ίδιων των κοινωνικών φορέων που συγκροτούν το ευρωπαϊκό κοινωνικό σύνολο
description: On the base of theories of thinkers as Kant and mainly Habermas, coming into sight the potentially using worth of the communication and the public space, especially however their selfenergy as tools for production of politics. Through of a radical shade insertion of the society into political reality, putting forward the solution of European Constitution by conversation and condecision of themselves the social factors constituting the european social community
Paley-Wiener-Schwartz Theorem and Microlocal Analysis in Theory of Tempered Ultrahyperfunctions
Creators: name: Franco, Daniel H. T.
name: Renoldi, Luiz H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give some precisions on the Fourier-Laplace transform theorem for tempered ultrahyperfunctions introduced by Sebastião e Silva and Hasumi, by considering the theorem in its simplest form: the equivalence between support properties of a distribution in a closed convex cone and the holomorphy of its Fourier-Laplace transform in a suitable tube with conical basis. We establish a generalization of Paley-Wiener-Schwartz theorem for this setting. This theorem is interesting in connection with the microlocal analysis, where a description of the singularity structure of tempered ultrahyperfunctions in terms of the concept of analytic wave front set is given. We also suggest a physical application of the results obtained in the construction and study of field theories with fundamental length.
description: Contribution to the Fifth International Conference on Mathematical Methods in Physics, Rio de Janeiro, April 24-28, 2006. PoS documentclass
A search for rapid pulsations among 9 luminous Ap stars
Creators: name: Freyhammer, L. M.
name: Kurtz, D. W.
name: Cunha, M. S.
name: Mathys, G.
name: Elkin, V. G.
name: Riley, J. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The rapidly oscillating Ap stars are of importance for studying the atmospheric structure of stars where the process of chemical element diffusion is significant. We have performed a survey for rapid oscillations in a sample of 9 luminous Ap stars, selected from their location in the colour-magnitude diagram as more evolved main-sequence Ap stars that are inside the instability strip for rapidly oscillating Ap (roAp) stars. Until recently this region was devoid of stars with observed rapid pulsations. We used the VLT UV-Visual Echelle Spectrograph (UVES) to obtain high time resolution spectroscopy to make the first systematic spectroscopic search for rapid oscillations in this region of the roAp instability strip. We report 9 null-detections with upper limits for radial-velocity amplitudes of 20 - 65 m/s and precisions of 7 - 20 m/s for combinations of Nd and Pr lines. Cross-correlations confirm these null-results. At least six stars are magnetic and we provide magnetic field measurements for four of them, of which three are newly discovered magnetic stars. It is found that four stars have magnetic fields smaller than ~ 2 kG, which according to theoretical predictions might be insufficient for suppressing envelope convection around the magnetic poles for more evolved Ap stars. Suppression of convection is expected to be essential for the opacity mechanism acting in the hydrogen ionisation zone to drive the high-overtone roAp pulsations efficiently. Our null-results suggest that the more evolved roAp stars may require particularly strong magnetic fields to pulsate. Three of the studied stars do, however, have magnetic fields stronger than 5 kG.
description: Accepted by MNRAS main journal
Minutes of the Annual Meeting of the Rainbow Ranche Limited, July 1, 1942
Creators: name: Rainbow Ranche
Publisher: name: The University of British Columbia
Year: 2017

description: Minutes of the annual general meeting of the Rainbow Ranche Limited, dated July 1 , 1942, signed by Mr. and Mrs. McAllister, Mr. and Mrs. Goldie; other copy signed by R.S. Dormer.
Constraining Extended Theories of Gravity using Solar System Tests
Creators: name: Allemandi, Gianluca
name: Ruggiero, Matteo Luca
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Solar System tests give nowadays constraints on the estimated value of the cosmological constant, which can be accurately derived from different experiments regarding gravitational redshift, light deflection, gravitational time-delay and geodesic precession. Assuming that each reasonable theory of gravitation should satisfy Solar System tests, we use these limits on the estimated value of the cosmological constant to constrain extended theories of Gravity, which are nowadays studied as possible theories for cosmological models and provide viable solutions to the cosmological constant problem and the explanation of the present acceleration of the Universe. We obtain that the estimated values, from Solar System tests, for the parameters appearing in the extended theories of Gravity are orders of magnitude bigger than the values obtained in the framework of cosmologically relevant theories.
description: 5 Pages, title changed, conclusions improved, references updated and added; to appear in General Relativity and Gravitation
Towards high-power, high-coherence, integrated photonic mmWave platform with microcavity solitons
Creators: name: Wang, Beichen
name: Morgan, Jesse S.
name: Sun, Keye
name: Jahanbozorgi, Mandana
name: Yang, Zijiao
name: Woodson, Madison
name: Estrella, Steven
name: Beling, Andreas
name: Yi, Xu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Millimeter-wave (mmWave) technology continues to draw large interest due to its broad applications in wireless communications, radar, and spectroscopy. Compared to pure electronic solutions, photonic-based mmWave generation provides wide bandwidth, low power dissipation, and remoting through low-loss fiber. However, at high frequencies, two major challenges exist for the photonic system: the power roll-off of the photodiode, and the large signal linewidth derived directly from the lasers. Here, we demonstrate a new photonic mmWave platform by combining integrated microresonator solitons and high-speed photodiodes to address the challenges in both power and coherence. The solitons, being inherently mode-locked, are measured to provide 5.8 dB additional gain through constructive interference among mmWave beatnotes, and the absolute mmWave power approaches the theoretical limit of conventional heterodyne detection at 100 GHz. In our free-running system, the soliton is capable of reducing the mmWave linewidth by two orders of magnitude from that of the pump laser. Our work leverages microresonator solitons and high-speed modified uni-traveling carrier photodiodes to provide a viable path to chip-scale high-power, low-noise, high-frequency sources for mmWave applications.
description: 9 pages, 5 figures
On the possibility to probe the flare productivity of an active region on the early stage of emergence
Creators: name: Kutsenko, Alexander S.
name: Abramenko, Valentina I.
name: Kutsenko, Olga K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A long-standing problem is to predict the future flare productivity of an active region (AR) when it is on the stage of early emergence. The aim of this study is to probe two parameters of the photospheric magnetic field, both derived during the emergence phase of an AR, and to compare them with the flare productivity of the well-developed AR. The parameters are: (i) the index of the magnetic power spectrum (the slope of the spectrum) on the stage of emergence, and (ii) the flux emergence rate. Analysis of 243 emerging ARs showed that the magnetic power index increases from values typical for quiet-Sun regions to the values typical for mature ARs within a day while the emergence proceeds for several days; frequently, after the increase, the value of the power index undulates around some mean value with fluctuations being several time less than the growth of the power index during the emergence onset. For a subset of 34 flare-productive ARs we found no correlation between the power spectrum index at the stage of emergence and flare index derived from the entire interval of the AR's presence on the disc. At the same time, the flux emergence rate correlates well with the flare index (the Pearson's correlation coefficient is 0.74). We conclude that high flux emergence rate is a necessary condition for an AR to produce strong flares in the future, and so, the flux emergence rate can be used to probe the future flare productivity of the AR.
Δίκτυα 4ης γενιάς (4G):
Creators: name: Κουρτελής, Αλέξιος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Δίκτυα 4ης γενιάς
Υπηρεσίες 4G
OFDM
All-IP
4G networks

description: Στην παρούσα διπλωματική εργασία παρουσιάζονται τα δίκτυα 4ης γενιάς (4G) με απλό και κατανοητό τρόπο. Η τέταρτη γενιά (4G) είναι η επόμενη γενιά των ασύρματων δικτύων που θα αντικαταστήσει τα δίκτυα τρίτης γενιάς (3G) και θα προσφέρει στους χρήστες όλα όσα δεν κατάφεραν να δώσουν τα προηγούμενα δίκτυα. Τα δίκτυα 4ης γενιάς αναμένεται να παρέχουν υπηρεσίες υψηλής ταχύτητας (τουλάχιστον 100Μbps), υψηλής χωρητικότητας (capacity), με χαμηλότερο κόστος ανά bit, βασισμένες αποκλειστικά στο πρωτόκολλο IP. Θα παρέχουν συμβατότητα με τα διαφορετικά κινητά και ασύρματα δίκτυα (νέα και παλαιά). Η τέταρτη γενιά ασύρματων δικτύων πρόκειται να δημιουργήσει ένα παγκόσμιο ετερογενές δίκτυο το οποίο θα ενσωματώσει τα δίκτυα 2ης και 3ης γενιάς.
description: In this thesis, the Fourth Generation networks (4G) are presented in a simple and comprehensible manner. Fourth Generation (4G) is the next generation of wireless networks that will replace the third Generation (3G) networks and will offer the services that the previous networks did not accomplish to offer. 4G intends to provide high speed (at least 100Mbps), high capacity, low cost per bit, exclusively IP based services. 4G will provide compatibility with the different new and old mobile and wireless networks. The 4th generation of wireless networks is going to create a global heterogeneous network which will incorporate the networks of 2nd and 3rd generation.
Towards the Virasoro-Shapiro Amplitude in AdS5xS5
Creators: name: Abl, Theresa
name: Heslop, Paul
name: Lipstein, Arthur E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a systematic procedure for obtaining all single trace 1/2-BPS correlators in N=4 super Yang-Mills corresponding to the four-point tree-level amplitude for type IIB string theory in AdS5xS5. The underlying idea is to compute generalised contact Witten diagrams coming from a 10d effective field theory on AdS5xS5 whose coefficients are fixed by the flat space Virasoro-Shapiro amplitude up to ambiguities related to commutators of the 10d covariant derivatives which require additional information such as localisation. We illustrate this procedure by computing stringy corrections to the supergravity prediction for all single trace 1/2-BPS correlators up to $O(α'^7)$, and spell out a general algorithm for extending this to any order in $α'$.
description: 39 pages
Galaxy Mergers and Interactions at High Redshift
Creators: name: Conselice, Christopher J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this review we discuss the evidence for galaxy interactions and mergers in the distant universe and the role of mergers in forming galaxies. Observations show that the fraction of massive (M> M_*) galaxies involved in major mergers is roughly 5-10% at z~1. The merger fraction however increases steeply for the most massive galaxies up to z~3, where the merger fraction is 50+/-20%. Using N-body models of the galaxy merger process at a variety of merger conditions, merger mass ratios, and viewing angles this merger fraction can be converted into a merger rate, and mass accretion rate due to mergers. A simple integration of the merger rate shows that a typical massive galaxy at z~3 will undergo 4-5 major mergers between z~3 and z~0, with most of this activity, and resulting mass assembly, occurring at z > 1.5.
description: Four pages, to appear in "Galaxy Evolution across the Hubble Time", IAU Symposium 235 (Invited review)
"Siddhartha", the Paradox, and the Counterculture
Creators: name: Manthripragada, Ashwin
Publisher: name: Germanistisches Institut (Universität Münster)
Year: 2014
Subjects: 800 Literatur, Rhetorik, Literaturwissenschaft

description: Während Hermann Hesse vor den 1960er Jahren zu einem der vielgelesenen Autoren gehörte, führte das starke Interesse der Gegenkultur an seinem Werk zu einem wissenschaftlichen Parallelfokus auf die globale Rezeption und Einfluss Hesses. Es scheint, als ob die Forschung auf eine Stärkung von Hans Robert Jauß' zeitgenössischen Annahmen zur Rezeptionstheorie ausgerichtet waren. Jauß' Rezeptionstheorie macht verständlich, wie ein einzelner Text unzählige Gedanken, Untersuchungen und Antworten bewirken kann. Der  Beitrag widmet sich daher der Frage, weshalb Siddharta gut 45 Jahre nach seinem Erscheinen für die US-amerikanische Gegenkultur von so hoher Relevanz war.
Optical alignment and polarization conversion of neutral exciton spin in individual InAs/GaAs quantum dots
Creators: name: Kowalik, K.
name: Krebs, O.
name: Lemaître, A.
name: Gaj, J. A.
name: Voisin, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate exciton spin memory in individual InAs/GaAs self-assembled quantum dots via optical alignment and conversion of exciton polarization in a magnetic field. Quasiresonant phonon-assisted excitation is successfully employed to define the initial spin polarization of neutral excitons. The conservation of the linear polarization generated along the bright exciton eigenaxes of up to 90% and the conversion from circular- to linear polarization of up to 47% both demonstrate a very long spin relaxation time with respect to the radiative lifetime. Results are quantitatively compared with a model of pseudo-spin 1/2 including heavy-to-light hole mixing.
description: 5 pages, 3 figures
Marginally Deformed Rolling Tachyon around the Tachyon Vacuum in Open String Field Theory
Creators: name: Kwon, O-Kab
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the string field theory around the tachyon vacuum. A pure gauge form of the solution is constructed at the tachyon vacuum. For a special choice of the gauge function for the pure gauge form, marginal deformation from the tachyon vacuum is allowed due to the nontrivial roles of Schnabl's analytic vacuum solution. We obtain an exact rolling tachyon solution which describes the late time behaviors of D-brane decay.
description: 1 figure, 21 pages, comments added, version to appear in Nucl. Phys. B
Comment on "Colossal Pressure-Induced Softening in Scandium Fluoride"
Creators: name: Zaliznyak, I. A.
name: Bozin, E.
name: Tkachenko, A. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The results reported by Wei et al. [Phys. Rev. Lett. 124, 255502 (2020)] can be confronted with predictive, quantitative theories of negative thermal expansion (NTE) and pressure-induced softening, allowing to corroborate, or invalidate certain approaches. Motivated to corroborate the quantitative predictions of the recent Coulomb Floppy Network (CFN) microscopic theory of vibrational and thermomechanical properties of empty perovskite crystals [Tkachenko and Zaliznyak, arXiv:1908.11643 (2019)], we compared theory prediction for the mean-squared transverse displacement of the F atoms, U$_{perp}$, with that reported in Fig. 5 of Wei et al. and observed a marked discrepancy (an order-of-magnitude larger than the error bar). We then compared these results with the previously published Xray diffraction data of Greve, et al. [JACS 132, 15496 (2010)] and the neutron diffraction data of Wendt, et al. [Science Advances 5 (2019), 10.1126/sciadv.aay2748]. We found the latter two data sets to be in a good agreement with each other, as well as with the prediction of CFN theory. We thus conclude that U$_{perp}$ values reported in Fig. 5 of Wei et al. are substantially incorrect. The purpose of this Comment is twofold: (i) to caution the researchers against using the U$_{perp}$ data of Wei et al. for quantitative comparisons with theory, and (ii) to encourage Wei et al. to reconsider their analysis and obtain a reliable U$_{perp}$ data by better accounting for the beam transmission and attenuation effects.
description: 1 page, 1 figure
Heat Transfer Augmentation in an Inclined Lid-Driven Triangular Enclosure Utilizing Nanofluids in Forced Convection Flows
Creators: name: M. M. Billah
Publisher: name: กองบริหารการวิจัย
Year: 2019
Subjects: Nanofluids, Triangular enclosure, Finite element method, Solid volume fraction

description: Science & Technology Asia, 24, 3, 1-16