cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Constraining Galactic $pγ$ Interactions with Cosmic Ray Electron and Positron Spectra
Creators: name: Gupta, Nayantara
name: Zhang, Bing
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: High energy protons produced by various sources of cosmic rays, {\it e.g.} supernova remnants, pulsar wind nebulae, active galactic nuclei and gamma-ray bursts participate in $pγ$ and $pp$ interactions. Although $pp$ interactions may be the dominant mechanism in our Galaxy, it is unclear how important $pγ$ process is. We show that the upper bound on the fraction of protons participating in $pγ$ interactions inside all Galactic astrophysical sources of cosmic rays is 10%.
description: 8 pages, title slightly modified, results corrected
Performance evaluation of S-parameter extraction techniques for time-domain optoelectronic vector network analyzers
Creators: name: Ruo, Russell L.
Publisher: name: University of British Columbia
Year: 2009

description: The objective of the thesis is to evaluate the performance of two methods recently proposed for scattering parameter (S-parameter) extraction using time-domain optoelectronic vector network analyzers. Model-based simulations of an electro-optic sampling experiment for a typical high-speed bipolar transistor were used to investigate the accuracy of the techniques in the presence of experimental non-idealities. In particular, the investigation focused on the effects of finite time window, drift and noise. The methods use step-like signals and digital filtering techniques to extract the S-parameters for one of two situations where signals are either temporally overlapped or not. From the simulations, it was determined that the approach for overlapping signals is not feasible. The experimental impairments of drift and noise interfere with the separation of overlapping signals and result in inaccurate S-parameter computation. Fair results may be obtained within a limited range of frequencies for extracting the S-parameters with the approach for non-overlapping signals. Although feasible, the latter method was not recommended over existing optoelectronic methods which use pulse-like input signals for S-parameter extraction. The digital filtering technique common to both methods was validated by an experimental measurement of signal propagation on a coplanar stripline fabricated on a multilayer S1O2/S1 substrate. The attenuation and effective dielectric constants were measured over a range of frequencies between 20 and 150 GHz. Elecromagnetic simulations of the structure performed by a collaborator were found to be in excellent agreement with the experimental results. The results show high losses and dispersive effects at low frequencies, which are attributed to the conductive substrate used.
New measurement of neutron capture resonances of 209Bi
Creators: name: Domingo-Pardo, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The neutron capture cross section of Bi209 has been measured at the CERN n TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of gamma-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. Gamma-ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by alpha-decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19(3)% of the solar bismuth abundance, resulting in an r-process residual of 81(3)%. The present (n,gamma) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target.
description: 10 pages, 5figures, recently published in Phys. Rev. C
Letter from James Goldie to Louis L. van Roechoudt, September 10, 1954
Creators: name: Goldie, James
Publisher: name: The University of British Columbia
Year: 2017

description: Letter from James Goldie to Louis L. van Roevhoudt, dated September 10, 1954, regarding the agreement for sale dated November 1949, covering lot 13, map 4213. ex. agreement for sale to L.H.St. Pierre dated November 12, 1948.
Αρχαιομετρική μελέτη λίθινων αρχαιολογικών μνημείων από το Δίον Πιερίας
Creators: name: Παπανικολάου, Ελένη Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: Αρχαιομετρία
Λίθινα μνημεία
Δίον
Archeometry
Stone monuments
Dion

description: Η παρούσα εργασία έχει σκοπό να προσδιοριστούν οι πετρολογικοί τύποι των πρώτων υλών που χρησιμοποιήθηκαν για την κατασκευή των λίθινων μνημείων καθώς και οι πηγές προέλευσης των πρώτων υλών μαρμάρινων μνημείων από τον αρχαιολογικό χώρο του Δίου Πιερίας. Τα μνημεία, τα οποία μελετήθηκαν χρονολογούνται από τον 2ο αι. π.Χ. έως τον 5ο αι. μ.Χ. Τα έντεκα πρώτα δείγματα είναι μαρμάρινα και η μελέτη απέδειξε ότι επτά (7)δείγματα προέρχονται από τα αρχαία λατομεία της Θάσου. Τέσσερα (4) δείγματα προέρχονται από τα λατομεία της Πεντέλης. Δύο (2) δείγματα αποτελούνται από ψαμμίτη και είναι πιθανώς τοπικής προέλευσης. Σύμφωνα με την παρούσα μελέτη προσδιορίστηκαν οι δρόμοι διακίνησης του μαρμάρου κατά την αρχαιότητα. Συνεπώς, η αρχαία πόλη του Δίου συνδεόταν με τα λατομεία της Πεντέλης και της Θάσου (Αλυκή, Άγιος Ιωάννης) από τους ελληνιστικούς ως τους πρώιμους βυζαντινούς χρόνους, σύμφωνα με τη χρονολόγηση των μνημείων της παρούσας εργασίας.
description: The present study aims at the determination of the lithological types of the raw materials used in manufacturing of the lithic monuments in Dion archaeological site, Central Macedonia, Greece. Such an investigation is very important in archaeological research because science provides with results which promote the study of the history of the ancient culture.The monuments studied here, thirteen in total, are dated between the 2nd B.C. and the 5th A.D. centuries. The archaeometrical study includes the petrographical characterization, the mineralogical composition and the C, O isotopic determination of the samples from the monuments. The provenance of the raw materials used for the 11 white-marble monuments is restricted in three ancient quarrying sites. One (1) sample is from the quarries of dolomitic marble of Agios Ioannis bay at the NE of Thassos island, six (6) samples are from the quarries of calcitic marble of Aliki in Thassos and four (4) samples come from the quarries of Penteli mountain in Attiki. The two (2) samples made of sandstone are probably of local origin, since there are a lot of sources of such type of sedimentary rocks at the slopes of Olympos mountain.
Structural and Optoelectronic Behaviour of Copper Doped Cs2AgInCl6 Double Perovskite: A DFT Investigation
Creators: name: Ogunniranye, I. B.
name: Atsue, T.
name: Oyewande, O. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Recently, direct bandgap double perovskites are becoming more popular among photovoltaic research community owing to their potential to address issues of lead (Pb) toxicity and structural instability inherent in lead halide (simple) perovskites. In this study, In-Ag based direct bandgap double perovskite, Cs2AgInCl6 (CAIC), is treated with transition metal doping to improve the optoelectronic properties of the material. Investigations of structural and optoelectronic properties of Cu-doped CAIC, Cs2Ag(1-x)CuxInCl6, are done using ab-initio calculations with density functional theory (DFT) and virtual crystal approximation (VCA). Our calculations show that with increasing Cu content, the optimized lattice parameter and direct bandgap of Cs2Ag(1-x)CuxInCl6 decrease following linear and quadratic functions respectively, while the bulk modulus increases following a quadratic function. The photo-absorption coefficient, optical conductivity and other optical parameters of interest are also computed, indicating enhanced absorption and conductivity for higher Cu contents. Based on our results, transition metal (Cu) doping is a viable means of treating double perovskites - by tuning their optoelectronic properties suitable for an extensive range of photovoltaics, solar cells and optoelectronics.
description: Submitted for publication on 15 July, 2020
Ο μελοποιημένος λόγος του Νίκου Καββαδία:
Creators: name: Τσιρέβελου, Βασιλική Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Μελοποίηση
Μουσικότητα
Τραγούδι
Εμπορικότητα
Κουλτούρα
Ροκ
Melopoiesis
Musicality
Song
Commercial marketing
Culture
Rock and roll

description: The main focus of this master’s thesis is the setting to music of the poetry of Nikos Kavvadias. In the first part we state the relationship that exists between music and poetry, and its perspectives: historical, theoretical and cultural. Afterwards we set decisive the total discography of Nikos Kavvadias. Among the most known musicians, who have worked on the poetry of Nikos Kavvadias, we focus on the musical creation of Thanos Mikroutsikos and the aesthetic debate that bears upon this particular disc. Music industry and its practices (media promotion, the public launching of the product) play a decisive role in the transformation of the verses, indicating a monolithic sign of mass culture, and its passive and unilateral consumption, while the social signification and other aspects of his poetry are excluded.
description: Le sujet principal de cette thèse de master est la mise en musique de la poésie de Nikos Kavvadias. A la première part nous exposons la relation qui existe entre la musique et la poésie, ainsi qu’elle s’émerge depuis longtemps et ouvre de perspectives multiples, historiques, théoriques, et culturelles. Nous citons de manière analytique la discographie complète du poète en comptant aussi quelques ouvrages moins connus par la public. Ci- dessous nous mettons au point les créations musicales de Thanos Mikroutsikos. Nous commentons d’ abord le débat esthétique autour de ce disque, comme les chansons de Kavvadias, durant cette période, ont joue un rôle de nouveauté esthétique. En outre, nous essayons de montrer la connexion et l’intersection entre l’élément artificiel, la ballade rock et le chant populaire, comme un endroit particulier marque par la mentalité du rock’ n’ roll. Notre essai n’a pas l’intention de critiquer qui que ce soit, mais de faire penser un peu aux choix de l’industrie musicale qui changent les critères de notre réflexion sur l’art et les conséquences qui en résultant.
description: El tema principal de nuestra memoria de licenciatura son las adaptaciones musicales de los poemas de Nikos Kavvadias. En la primera parte indicamos el lazo que existe entre la música y la poesía y sus perspectivas: históricas, teóricas y culturales. Después citamos con detalle la discografía total de la obra de Nikos Kavvadias. Entre los más famosos nombres que han trabajado sobre la poesía de Nikos Kavvadias, nos centraremos exclusivamente en la creación musical de Thanos Mikroutsikos y el debate estético que este particular disco provoca. La industria musical y sus procedimientos (promoción y lanzamiento de producto) juegan un papel decisivo, en principio, en la conversión de los versos en una cultura masiva, dejando al margen el significado social y los aspectos filosóficos de la poesía de Nikos Kavvadias.
Leidenschaft aus der Frühzeit der Archäologie. Otto Tischler und seine Beiträge zur antiken Glasproduktion
Creators: name: Rosskamp, Elke
name: Grunwald, Susanne
Publisher: name: Acta Praehistorica et Archaeologica
Year: 2021

description: Acta Praehistorica et Archaeologica, Bd. 49 (2017)
Understanding Technology Use in Global Virtual Teams: Research Methodologies and Methods
Creators: name: Clear, Tony
name: MacDonell, Stephen G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Context: The globalisation of activities associated with software development and use has introduced many challenges in practice and for research. While the predominant approach to research in software engineering has followed a positivist science model, this approach may be sub-optimal when addressing problems with a dominant social or cultural dimension, such as those frequently encountered when studying work practices in a globally distributed team setting. The investigation of such a team reported in this paper provides one example of an alternative approach to research in a global context, through a longitudinal interpretive field study seeking to understand how global virtual teams mediated the use of technology. Objective: Our focus in this paper is on the conduct of research in the context of global software activities, particularly as applied to the actions and interactions of global virtual teams. Method: We describe how we undertook a substantial field study of global virtual teams, and highlight how the adopted structuration theory enabled us to deliver effectively against our goals. Results: We believe that the approach taken suited a research context in which situated practices were occurring over time in a highly complex domain, ensuring that our results were both strongly grounded and relevant to practice. It has resulted in the generation of substantive theory and techniques that have been adapted and applied on a pilot basis in further field settings. Conclusion: We conclude that globally distributed teamwork presents a complex context which demands new research approaches, beyond the limited set customarily applied by software engineering researchers. We advocate experimenting with different research methodologies and methods so that we have a more rounded repertoire to address the most important and relevant issues in global software development research.(Abridged)
description: Journal Paper, 21 pages, 7 figures, 8 tables
Οι προϋποθέσεις της τέχνης κατά τον Arthur C. Danto: ο ρόλος της αναφορικότητας και της ερμηνείας του έργου τέχνης
Creators: name: Καφετζοπούλου, Μαγδαληνή Θεοφάνη
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Αρθουρ Ντάντο
Τέχνη
Αναφορικότητα
Ερμηνεία
Εργο τέχνης
Ενσωματωμένο νόημα
Arthur Danto
Art
Aboutness
Interpretation
Artwork
Embodied meaning

description: Στην εργασία παρουσιάζονται οι θεσεις του Arthour Danto για την τέχνη και ειδικότερα ο ρόλος της αναφορικότητας και της ερμηνείας του έργου τέχνης ως προϋποθέσεις της τέχνης. Επίσης, αναλύεται η σχέση της γλώσσας με την τέχνη, καθώς και η διάδραση της τλεχνης με την πραγματικότητα στην φιλοσοφική σκέψη του Arthur Danto.
description: In this master thesis we are introduced to Arthur Danto's approach to art and specifically to the role of aboutness and interpretation of the work of art, as condition of art. It also includes an analysis of the relation between language and art, as well as the interaction of art to reality in the philosophical thought of Arthur Danto.
Low compressible noble metal carbides with rock-salt structure: ab initio total energy calculations of the elastic stability
Creators: name: Fan, Chang-Zeng
name: Zeng, Song-Yan
name: Zhan, Zai-Ji
name: Liu, Ri-Ping
name: Wang, Wen-Kui
name: Zhang, Ping
name: Yao, Yu-Gui
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have systematically studied the mechanical stability of all noble metal carbides with the rock-salt structure by calculating their elastic constants within the density function theory scheme. It was found that only four carbides (RuC, PdC, AgC and PtC) are mechanically stable. In particular, we have shown that RuC, PdC, and PtC have very high bulk modulus, which has been remarkably observed by the most recent experiment for the case of PtC. From the calculated density of states, we can conclude that these compounds are metallic, like the conventional group IV and group V transition metal carbides.
description: Appl. Phys. Lett. 89, 071913 (2006)
Emergent quasiparticles in Euclidean tilings
Creators: name: de Lima, F. Crasto
name: Fazzio, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Material's geometrical structure is a fundamental part of their properties. The honeycomb geometry of graphene is responsible for the arising of its Dirac cone, while the kagome and Lieb lattice hosts flat bands and pseudospin-1 Dirac dispersion. These features seem to be particular for few 2D systems rather than a common occurrence. Given this correlation between structure and properties, exploring new geometries can lead to unexplored states and phenomena. Kepler is the pioneer of the mathematical tiling theory, describing ways of filing the euclidean plane with geometrical forms in its book {\it Harmonices Mundi}. In this letter, we characterize $1255$ lattices composed of the euclidean plane's k-uniform tiling, with its intrinsic properties unveiled - this class of arranged tiles present high-degeneracy points, exotic quasiparticles, and flat bands as a common feature. Here, we present aid for experimental interpretation and prediction of new 2D systems.
Power of Black Hole Physics: Seeing through the Vacuum Landscape
Creators: name: Dvali, Gia
name: Lust, Dieter
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we generalize the black hole bound of arXiv:0706.2050 to de Sitter spaces, and apply it to various vacua in the landscape, with a special emphasis on slow-roll inflationary vacua. Non-trivial constraints on the lifetime and the Hubble expansion rate emerge. For example, the general tendency is, that for the fixed number and the increasing mass of the species, vacua must become more curved and more unstable, either classically or quantum mechanically. We also discuss the constraints on the lifetime of vacua in the landscape, due to decay into the neighboring states.
description: 33 pages
Octave-Tunable Magnetostatic Wave YIG Resonators on a Chip
Creators: name: Dai, Sen
name: Bhave, Sunil A.
name: Wang, Renyuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Signal Processing (eess.SP)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We have designed, fabricated, and characterized magnetostatic wave (MSW) resonators on a chip. The resonators are fabricated by patterning single-crystal yttrium iron garnet (YIG) film on a gadolinium gallium garnet (GGG) substrate and excited by loop-inductor transducers. We achieved this technology breakthrough by developing a YIG film etching process and fabricating thick aluminum coplanar waveguide (CPW) inductor loop around each resonator to individually address and excite MSWs. At 4.77 GHz, the 0.68 square mm resonator achieves a quality factor Q > 5000 with a bias field of 987 Oe. We also demonstrate YIG resonator tuning by more than one octave from 3.63 to 7.63 GHz by applying an in-plane external magnetic field. The measured quality factor of the resonator is consistently over 3000 above 4 GHz. The micromachining technology enables the fabrication of multiple single- and two-port YIG resonators on the same chip with all resonators demonstrating octave tunability and high Q .
[Paper on aspect suffixes -ti, -yoma, -yota, -yku]
Creators: name: Niepokuj, Mary
name: Hinton, Leanne
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hop

description: Handwritten, 5 pages. Includes 3 separate typed pages inferred to be related to the same project; date as indicated on latter pages.
Single photon wavefront-splitting interference: An illustration of the light quantum in action
Creators: name: Jacques, V.
name: Wu, E.
name: Toury, T.
name: Treussart, F.
name: Aspect, A.
name: Grangier, P.
name: Roch, J. -F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a new realization of the textbook experiment consisting in single-photon interference based on the pulsed, optically excited photoluminescence of a single colour centre in a diamond nanocrystal. Interferences are created by wavefront-splitting with a Fresnel's biprism and observed by registering the "single-photon clicks" with an intensified CCD camera. This imaging detector provides also a real-time movie of the build-up of the single-photon fringes. We perform a second experiment with two detectors sensitive to photons that follow either one or the other interference path. Evidence for single photon behaviour is then obtained from the absence of time coincidence between detections in these two paths.
description: Movie showing the built-up of interference fringes is available as a supplementary file
Potential super-hard Osmium di-nitride with fluorite structure: First-principles calculations
Creators: name: Fan, Chang-Zeng
name: Zeng, Song-Yan
name: Li, Li-Xin
name: Liu, Ri-Ping
name: Wang, Wen-Kui
name: Zhang, Ping
name: Yao, Yu-Gui
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have performed systematic first-principles calculations on di-carbide, -nitride, -oxide and -boride of platinum and osmium with the fluorite structure. It is found that only PtN$_{2}$, OsN$_{2}$ and OsO$_{2}$ are mechanically stable. In particular OsN$_{2}$ has the highest bulk modulus of 360.7 GPa. Both the band structure and density of states show that the new phase of OsN$_{2}$ is metallic. The high bulk modulus is owing to the strong covalent bonding between Os 5\textit{d} and N 2\textit{p} states and the dense packed fluorite structure.
description: Phys. Rev. B 74,125118 (2006)
Real-time location and parameterization of eyes in an image sequence and the detection of their point-of-gaze
Creators: name: Smith, Michael David
Publisher: name: University of British Columbia
Year: 2009

description: The determination of point-of-gaze of an imaged subject is the main focus of this thesis. Digitized image sequences from a single camera are analysed to determine the point-of-gaze of a subject without manual setup of algorithms for that subject or calibration of the system. A novel feature of this work is that eyes are initially located by using motion to characterize possible Eye-events. A priori knowledge of an eye's motions, spatial orientation and characteristics are used to find Eye-events. Deformable templates are used to parameterize eyes in an image sequence into a parameterization vector using a 2-D model of the eye and face. The pupil, iris, skin, hair, upper and lower eyelids of a subject are parameterized to form a knowledge base for that subject. The tracking of these eye parameters is performed similarly to their initial parameterization. Point-of-gaze is determined by applying the 2-D eye and face parameters to a 3-D model of the eye. Eye Location, Parameterization, and Tracking algorithms are run using both Matlab on a SPARC 5 workstation and C on a TMS32C40 parallel processing network. The algorithms described in this thesis run equally well on both of these systems. The algorithms are shown to be able to locate eyes in a series of images over a wide range of eye scales. The accuracy of the algorithms is analysed on the SPARC system by having a subject view sets of targets at known locations. The system's determination of a person's point-of-gaze was compared to the actual target positions, showing an error of 4.01° or less along the horizontal axis and 4.99° or less along the vertical axis for targets at or above the eye level of the subject. The accuracy of the system lowers to 5.41° or less along the horizontal axis and 15.76° or less along the vertical axis for targets below the eye level of the test subject. The C40 parallel processing system which runs these algorithms, automatically switching between the Location, Parameterization, and Tracking modes of operation, is described in detail. This system was able to track parameterized eye features at up to 15 frames per second (fps) during saccadic eye motion without a requirement for a fixed head position. The timing of these algorithms on the C40 network is analysed.
Investigation of Shock Wave Interactions involving Stationary and Moving Wedges
Creators: name: Seshadri, Pradeep Kumar
name: De, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present study investigates the shock wave interactions involving stationary and moving wedges using a sharp interface immersed boundary method combined with a fifth order weighted essentially non oscillatory (WENO) scheme. Inspired by Schardins problem, which involves moving shock interaction with a finite triangular wedge, we study influences of incident shock Mach number and corner angle on the resulting flow physics in both stationary and moving conditions. The present study involves three incident shock Mach numbers (1.3, 1.9, 2.5) and three corner angles (60deg, 90deg, 120deg), while its impact on the vorticity production is investigated using vorticity transport equation, circulation, and rate of circulation production. Further, the results yield that the generation of the vorticity due to the viscous effects are quite dominant compared to baroclinic or compressibility effects. The moving cases presented involve shock driven wedge problem. The fluid and wedge structure dynamics are coupled using the Newtonian equation. These shock driven wedge cases show that wedge acceleration due to the shock results in a change in reflected wave configuration from Single Mach Reflection (SMR) to Double Mach Reflection (DMR). The intermediary state between them, the Transition Mach Reflection (TMR), is also observed in the process. The effect of shock Mach number and corner angle on Triple Point (TP) trajectory, as well as on the drag coefficient, is analyzed in this study.
Η μελέτη του φαινομένου της διγλωσσίας στην προσχολική ηλικία
Creators: name: Μαράνου, Σουλτάνα Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2008
Subjects: διγλωσσία
διαπολιτισμικότητα
προσχολική ηλικία
bilinguisme
multiculturality
preschool age

description: Στην παρούσα διπλωματική εργασία με τίτλο «H μελέτη του φαινομένου της διγλωσσίας στην προσχολική ηλικία», εξετάζεται το αν τα παιδιά μεταναστών που γεννήθηκαν στην Ελλάδα, διατηρούν τη μητρική τους γλώσσα. Αρχικά, γίνεται μια βιβλιογραφική επισκόπηση των θεωρητικών πλαισίων για την ερμηνεία της γλώσσας, δίνονται οι ορισμοί της διγλωσσίας, της μητρικής και της ξένης γλώσσας, της εναλλαγής κωδίκων. Δίνεται έμφαση στους παράγοντες που επιδρούν στη γλωσσική ανάπτυξη των δίγλωσσων παιδιών και ιδιαίτερα στο κοινωνικό και στο οικογενειακό περιβάλλον. Παρουσιάζονται τα στάδια εξέλιξης του δίγλωσσου παιδιού και γίνεται αναφορά στη δίγλωσση εκπαίδευση και τη διαπολιτισμικότητα. Στη συνέχεια, το ερευνητικό μέρος περιλαμβάνει μια οκτάμηνη έρευνα σε τάξη νηπιαγωγείου κατά την οποία αρχικά σκιαγραφήθηκε το προφίλ των μαθητών και στη συνέχεια σχεδιάστηκε και εφαρμόστηκε πρόγραμμα δραστηριοτήτων με γνώμονα τη διγλωσσία, τη διαπολιτισμικότητα και φυσικά το δυναμικό της τάξης .Τέλος, παρουσιάζονται τα αποτελέσματα της έρευνας αυτής.
description: The aim of the present dissertation, entitled “The study of bilinguisme at preschool age”, is to examine if the children who were born in Greece and whose parents are immigrants maintain their mother tongue. At first, there is a theoretical framework about language and it is precised what is bilinguisme, mother tongue, foreign language and code –switching. There are also examined the factors that affect the language development of bilingual children (society and family environment). Furthermore, there are presented the stages of development of bilingual children, as well as the bilingual education and multiculturality. At second part, there is an eight month survey in a preschool class in which there was designed and developed a program of bilingual activities. Finally, there are presented the results of the above survey.
Development status of the SOXS spectrograph for the ESO-NTT telescope
Creators: name: Schipani, P.
name: Campana, S.
name: Claudi, R.
name: Aliverti, M.
name: Baruffolo, A.
name: Ben-Ami, S.
name: Biondi, F.
name: Capasso, G.
name: Cosentino, R.
name: D'Alessio, F.
name: D'Avanzo, P.
name: Hershko, O.
name: Kuncarayakti, H.
name: Landoni, M.
name: Munari, M.
name: Pignata, G.
name: Rubin, A.
name: Scuderi, S.
name: Vitali, F.
name: Young, D.
name: Achren, J.
name: Araiza-Duran, J. A.
name: Arcavi, I.
name: Brucalassi, A.
name: Bruch, R.
name: Cappellaro, E.
name: Colapietro, M.
name: Della Valle, M.
name: De Pascale, M.
name: Di Benedetto, R.
name: D'Orsi, S.
name: Gal-Yam, A.
name: Genoni, M.
name: Hernandez, M.
name: Kotilainen, J.
name: Causi, G. Li
name: Marty, L.
name: Mattila, S.
name: Radhakrishnan, K.
name: Rappaport, M.
name: Ricci, D.
name: Riva, M.
name: Salasnich, B.
name: Savarese, S.
name: Smartt, S.
name: Sanchez, R. Zanmar
name: Stritzinger, M.
name: Ventura, H.
name: Pasquini, L.
name: Scholler, M.
name: Kaufl, H. U.
name: Accardo, M.
name: Mehrgan, L.
name: Pompei, E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: SOXS (Son Of X-Shooter) is a single object spectrograph, characterized by offering a wide simultaneous spectral coverage from U- to H-band, built by an international consortium for the 3.6-m ESO New Technology Telescope at the La Silla Observatory, in the Southern part of the Chilean Atacama Desert. The consortium is focussed on a clear scientific goal: the spectrograph will observe all kind of transient and variable sources discovered by different surveys with a highly flexible schedule, updated daily, based on the Target of Opportunity concept. It will provide a key spectroscopic partner to any kind of imaging survey, becoming one of the premier transient follow-up instruments in the Southern hemisphere. SOXS will study a mixture of transients encompassing all distance scales and branches of astronomy, including fast alerts (such as gamma-ray bursts and gravitational waves), mid-term alerts (such as supernovae and X-ray transients), and fixed-time events (such as the close-by passage of a minor planet or exoplanets). It will also have the scope to observe active galactic nuclei and blazars, tidal disruption events, fast radio bursts, and more. Besides of the consortium programs on guaranteed time, the instrument is offered to the ESO community for any kind of astrophysical target. The project has passed the Final Design Review and is currently in manufacturing and integration phase. This paper describes the development status of the project.
description: Proc SPIE Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144709,2020
Dark Energy and Neutrino Model in SUSY
Creators: name: Takahashi, Ryo
name: Tanimoto, Morimitsu
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the effect of the supersymmetry breaking on the Mass Varying Neutrinos(MaVaNs) scenario. Especially, the effect mediated by the gravitational interaction between the hidden sector and the dark energy sector is studied. A model including a chiral superfield in the dark sector and the right-handed neutrino superfield is proposed. Evolutions of the neutrino mass and the equation of state parameter are presented in the model.
description: 4 pages, 3 figures, comments added, to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 2006
Agreement between The Rainbow Ranche Limited and Shigehisa Hikichi, September 25, 1954
Creators: name: Rainbow Ranche
Publisher: name: The University of British Columbia
Year: 2017

description: Agreement between The Rainbow Ranche Limited and Shigehisa Hikichi, dated September 25, 1954, regarding the subdivision of Lot A into Lots 1 and 2 and Lot B into lots 3 and 4; Affidavit of Witness signed by S. J. [Sidney Joseph] Land enclosed.
Design of a generalized platform for gathering protein sequence → function datasets at scale
Creators: name: Cortade, Dana
name: d'Oelsnitz, Simon
name: Chadha, Anjali
name: Hayes, Oliver
name: Taghon, Geoffrey
name: Doerr, Mark
name: Born, Stefan
name: Kelly, Peter
name: Ross, David
name: DeBenedictis, Erika
name: Align to Innovate
Publisher: name: Zenodo
Year: 2024

description: This article proposes a high-throughput experimental platform for collecting large-scale protein function datasets. The platform utilizes a pooled, growth-based assay to measure protein function quantitatively, allowing for the analysis of up to 500,000 protein variants per experiment at a cost of approximately $0.05 per sequence. This method is designed to be adaptable to a wide variety of protein functions by validating gene circuits and establishing calibration variants. The process involves creating barcoded libraries of protein variants, transforming them into bacteria, growing them under selective conditions, and sequencing the barcodes to quantify differential growth rates. The data collected will populate an open dataset after an embargo period, facilitating the development of machine learning models to predict protein functions from DNA sequences. The platform aims to standardize data collection across different labs and protein families, ultimately contributing to the creation of a generalizable predictive model for protein function, which could significantly advance the field of biology.
Bericht über das Forschungsprojekt »Laserscangestützte 3D-Visualisierung bedeutsamer archäologischer Stätten in Vani und Dmanisi, Georgien« für das Jahr 2017
Creators: name: Nawroth, Manfred
Publisher: name: Acta Praehistorica et Archaeologica
Year: 2021

description: Acta Praehistorica et Archaeologica, Bd. 50 (2018)
Boundary problems for three-dimensional Dirac operators and generalized MIT bag models for unbounded domains
Creators: name: Rabinovich, Vladimir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35J56, 81Q10

description: We consider operators of boundary value problems for 3D- Dirac operators in unbounded domains with the uniformly regular boundary. We give effective conditions of self-adjointness of operators under consideration and a description of their essential spectra. We also give applications to operators of the MIT bag problems for unbounded domains
description: 25 pages
Electrons in intense laser fields with local phase, polarization, and skyrmionic textures
Creators: name: Wätzel, Jonas
name: Berakdar, Jamal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Laser fields can be shaped on a subwavelength scale as to have a specific distribution in spin angular momentum, orbital structure, or topology. We study how these various features affect the strongly nonlinear electron dynamics. Specifically, we derive closed expressions for the wave function of an unbound electron subject to a generally structured, intense laser field and demonstrate its use for imprinting the orbital angular momentum of a propagating optical vortex onto photoelectrons emitted from atoms and traveling through the optical vortex. It is also shown that photoelectrons can be accelerated or momentum textured when moving through a focused, intense laser field whose spin angular momentum is modulated as to have a radial polarization, which also implies the presence of a strong electrical longitudinal component. Further results are presented on the subwavelength spatiotemporal imaging of a laser field topology, as demonstrated explicitly for the field's spin and orbital distributions of lossless propagating optical skyrmions imaged by photoelectrons.
description: 15 pages, 8 figures, accepted at PRA
Bericht für 2017 über das Vorhaben »Forschungskontinuität und Kontinuitätsforschung – Siedlungsarchäologische Grundlagenforschung zur Eisenzeit im Baltikum«
Creators: name: Wemhoff, Matthias
name: Eilbracht, Heidemarie
Publisher: name: Acta Praehistorica et Archaeologica
Year: 2021

description: Acta Praehistorica et Archaeologica, Bd. 50 (2018)
Chirality-induced Dynamic Kohn Anomalies in Graphene
Creators: name: Tse, Wang-Kong
name: Hu, Ben Yu-Kuang
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We develop a theory for the renormalization of the phonon energy dispersion in graphene due to the combined effects of both Coulomb and electron-phonon (e-ph) interactions. We obtain the renormalized phonon energy spectrum by an exact analytic derivation of the phonon self-energy, finding three distinct Kohn anomalies (KAs) at the phonon wavevector $q = ω/v, 2k_F\pmω/v$ for LO phonons and one at $q = ω/v$ for TO phonons. The presence of these new KAs in graphene, in contrast to the usual KA $q = 2k_F$ in ordinary metals, originates from the dynamical screening of e-ph interaction (with a concomitant breakdown of the Born-Oppenheimer approximation) and the peculiar chirality of the graphene e-ph coupling.
description: Accepted by PRL; updated version to appear in Physical Review Letters
Tyrannosaurus rex
Creators: name: John M. Asara
name: Mary H. Schweitzer
name: Lisa M. Freimark
name: Matthew Phillips
name: Lewis C. Cantley
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Reptilia
Dinosauria
Tyrannosauridae
Tyrannosaurus
Tyrannosaurus rex

description: We sequenced collagen protein fragments derived from fossilized bones of two extinct taxa: a 160,000- to 600,000-year-old mastodon [specimen number Museum of the Rockies (MOR) 605] (9) and a 68-million-year-old dinosaur (Tyrannosaurus rex,
 MOR 1125) (10),
 results that are supported by immunological and molecular analyses published in this issue by Schweitzer et al. (11). We first looked for tryptic peptide fragments from extracts of fossilized bone that matched identically with sequences from an orthologous protein or proteins from extant taxa, thereby identifying the protein(s) of interest. This is a common procedure for conserved proteins from taxa that share genomic information. Next, we generated a protein sequence database of likely drifts in amino acids in other tryptic peptides by comparing amino acid sequences ofthe orthologs from multiple related extant taxa. This approach produced a manageable number of theoretical protein sequences. The predicted peptide fragmentation pattern from these theoretical protein sequences were then compared with the fragmentation patterns of additional peptides derived from extracts of fossilized bone that did not match peptides in public sequence databases (fig. S1).
description: Published as part of John M. Asara, Mary H. Schweitzer, Lisa M. Freimark, Matthew Phillips & Lewis C. Cantley, 2007, Protein sequences from mastodon and Tyrannosaurus rex revealed by mass spectrometry, pp. 280-284 in Science 316 (5822) on page 281, DOI: 10.1126/science.1137614, http://zenodo.org/record/3744436
Geometric information in eight dimensions vs. quantum information
Creators: name: Tarkhanov, Victor I.
name: Nesterov, Michael M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Complementary idempotent paravectors and their ordered compositions, are used to represent multivector basis elements of geometric Clifford algebra for 3D Euclidean space as the states of a geometric byte in a given frame of reference. Two layers of information, available in real numbers, are distinguished. The first layer is a continuous one. It is used to identify spatial orientations of similar geometric objects in the same computational basis. The second layer is a binary one. It is used to manipulate with 8D structure elements inside the computational basis itself. An oriented unit cube representation, rather than a matrix one, is used to visualize an inner structure of basis multivectors. Both layers of information are used to describe unitary operations -- reflections and rotations -- in Euclidian and Hilbert spaces. The results are compared with ones for quantum gates. Some consequences for quantum and classical information technologies are discussed.
description: 14 pages, presented at International Symposium "Quantum Informatics 2007", October 3rd - 5th, 2007, Moscow Zvenigorod, Russia
title: Εικαστική παρέμβαση στην φοιτητική εστία του Μετσοβίου Πολυτεχνείου, στην Πανεπιστημιούπολη Ζωγράφου
title: Visual intervention in the student residence of the Technical University of Athens, in the Zografou Campus
titleType: AlternativeTitle
Creators: name: Μιλουτίνοβιτς, Βάνια
name: Καραϊσαλίδης, Γεώργιος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2024
Subjects: Εστία
Μύκητας
Προσκόλληση
Εξάπλωση
Διαφάνεια
Κατοικία
Εικαστική παρέμβαση
Κυψελωτή μορφή
Φοιτητική εστία
Ελεύθερος χώρος
Μορφολογική ρευστότητα
Διάτρητη μορφή

description: Η πτυχιακή αφορά το σχεδιασμό μιας εικαστικής παρέμβασης στην φοιτητική εστία του Μετσοβίου Πολυτεχνείου, στην Πανεπιστημιούπολη Ζωγράφου. Έχει στόχο να θίξει προβλήματα και παθογένειες που σχετίζονται με την παρακμή του κτιρίου και την σταδιακή του εγκατάλειψη.
The ESO Large Programme First Stars
Creators: name: Bonifacio, P.
name: Andersen, J.
name: Andrievsky, S.
name: Barbuy, B.
name: Beers, T. C.
name: Caffau, E.
name: Cayrel, R.
name: Depagne, E.
name: Francois, P.
name: Hernandez, J. I. Gonzalez
name: Hansen, C. J.
name: Herwig, F.
name: Hill, V.
name: Korotin, S. A.
name: Ludwig, H. -G.
name: Molaro, P.
name: Nordstrom, B.
name: Plez, B.
name: Primas, F.
name: Sivarani, T.
name: Spite, F.
name: Spite, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In ESO period 65 (April-September 2000) the large programme 165.N-0276, led by Roger Cayrel, began making use of UVES at the Kueyen VLT telescope. Known within the Team and outside as ``First Stars'', it was aimed at obtaining high resolution, high signal-to-noise ratio spectra in the range 320 nm -- 1000 nm for a large sample of extremely metal-poor (EMP) stars identified from the HK objective prism survey.In this contribution we highlight the main results of the large programme.
description: to be published in the proceedings of the Workshop "Science with VLT in the ELT era" 8-12 October 2007, Garching, ed. A. Moorwood
Emergent Gravity as the Eraser of Anomalous Gauge Boson Masses, and QFT-GR Concord
Creators: name: Demir, Durmus
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the same base setup as Sakharov's induced gravity, we investigate emergence of gravity in effective quantum field theories (QFT), with particular emphasis on the gauge sector in which gauge bosons acquire anomalous masses in proportion to the ultraviolet cutoff $Λ_\wp$. Drawing on the fact that $Λ_\wp^2$ corrections explicitly break the gauge and Poincare symmetries, we find that it is possible to map $Λ_\wp^2$ to spacetime curvature as a covariance relation and we find also that this map erases the anomalous gauge boson masses. The resulting framework describes gravity by the general relativity (GR) and matter by the QFT itself with $\logΛ_\wp$ corrections (dimensional regularization). This QFT-GR concord predicts existence of new physics beyond the Standard Model such that the new physics can be a weakly-interacting or even a non-interacting sector comprising the dark matter, dark energy and possibly more. The concord has consequential implications for collider, astrophysical and cosmological phenomena.
description: 22 pages, 3 tables; to appear in General Relativity and Gravitation
Bericht über das DFG-Projekt »Das Gebiet des ehemaligen Ostpreußens während der Römischen Kaiser- und Völkerwanderungszeit
Creators: name: Jahn, Christoph
name: Szter, Izabela
Publisher: name: Acta Praehistorica et Archaeologica
Year: 2021

description: Acta Praehistorica et Archaeologica, Bd. 50 (2018)
Search for polarization from the prompt gamma-ray emission of GRB 041219a with SPI on INTEGRAL
Creators: name: Kalemci, E.
name: Boggs, S. E.
name: Kouveliotou, C.
name: Finger, M.
name: Baring, M. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Measuring the polarization of the prompt gamma-ray emission from GRBs can significantly improve our understanding of both the GRB emission mechanisms, as well as the underlying engine driving the explosion. We searched for polarization in the prompt gamma-ray emission of GRB 041219a with the SPI instrument on INTEGRAL. Using multiple-detector coincidence events in the 100--350 keV energy band, our analysis yields a polarization fraction from this GRB of 99 +- 33 %. Statistically, we cannot claim a polarization detection from this source. Moreover, different event selection criteria lead to even less significant polarization fractions, e.g. lower polarization fractions are obtained when higher energies are included in the analysis. We cannot strongly rule out the possibility that the measured modulation is dominated by instrumental systematics. Therefore, SPI observations of GRB 041219a do not significantly constrain GRB models. However, this measurement demonstrates the capability of SPI to measure polarization, and the techniques developed for this analysis.
description: 8 pages, 11 figures, accepted to be published in ApJS
BHMSGA ASOSAN MOLIYAVIY NATIJALAR HISOBI HAMDA  O'ZBEKISTON RESPUBLIKASINING MHXSGA O'TISHI
Creators: name: Sherg`oziyeva, Mehrinigor
Publisher: name: Zenodo
Year: 2024

description: Ushbu tezisda O’zbekiston Respublikasining buxgalteriya hisobi milliy standartining xalqaro standartlariga o’tishi, moliyaviy hisobotlarning sifatini oshirish, shaffoflikni ta’minlash, investorlarning ishonchini oshirish va xalqaro bozorlarga kirish imkoniyatlarini kengaytirish maqsadida amalga oshirilayotgan jarayonlar bayon qilinadi. Bu jarayonlar Iqtisodiyot va Moliya vazirligi tomonidan boshqariladi va xalqaro buxgalteriya hisobi sohasidagi tashkilotlar bilan hamkorlikda olib boriladi, shu bilan birgalikda tezisda, ularning bosqichlari, afzalliklari va muammolari tahlil qilinadi.
Bericht über die Arbeit der Kommission zur Erforschung von Sammlungen archäologischer Funde und Unterlagen aus dem nordöstlichen Mitteleuropa (KAFU) im Jahr 2017
Creators: name: Neumayer, Heino
Publisher: name: Acta Praehistorica et Archaeologica
Year: 2021

description: Acta Praehistorica et Archaeologica, Bd. 50 (2018)