cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Χαρτογράφηση και παρακολούθηση υγροβιοτόπων με τη χρήση Γ.Σ.Π. και Τηλεπισκόπησης
Creators: name: Μελιάδης, Μιλτιάδης Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: χαρτογράφηση υγροβιοτόπων
αντικειμενοστραφής ταξινόμηση
διαχρονική μεταβολή
wetland mapping
object based classification
time series model

description: Ο ρόλος των υγροβιότοπων, τόσο ο οικολογικός όσο και ο οικονομικός, αναγνωρίζεται ολοένα και περισσότερο και για αυτό δίνεται ιδιαίτερη σημασία στην ακριβή και λεπτομερή χαρτογράφηση τους. Η δορυφορική τηλεπισκόπιση αποτελεί μια πρακτική, αποτελεσματική και οικονομική μέθοδο για την καταγραφή των υγροτροπικών οικοσυστημάτων. Διάφορες μεθοδολογίες έχουν αναπτυχθεί για την επεξεργασία και ανάλυση δορυφορικών δεδομένων προκειμένου να δημιουργηθεί ένας ακριβής χάρτης. Μια από τις μεθόδους που έχουν υιοθετηθεί τελευταία, για την χαρτογράφηση υγροβιότοπων, είναι η αντικειμενοστραφής ταξινόμηση δορυφορικής εικόνας. Στην παρούσα μελέτη αξιολογήθηκε η δυνατότητα της διάκρισης των υγροβιότοπων και της διαχρονικής μεταβολής τους στη ίδια εποχή του έτους (καλοκαίρι) με ψηφιακή ανάλυση δορυφορικών δεδομένων. Αρχικά αναπτύχθηκε το αντικειμενοστραφές μοντέλο ταξινόμησης με τη χρήση δορυφορικής εικόνας LANDSAT5 TM με σκοπό την χαρτογράφηση των κατηγοριών κάλυψης/χρήσεων γης. Κατόπιν, το μοντέλο ταξινόμησης μεταφέρθηκε σε ίδιας εποχής δορυφορικές εικόνες LANDSAT5 TM, διαφορετικής χρονολογίας και έγινε έλεγχος της ικανότητας μεταφοράς των αλγορίθμων της ταξινόμησης και δημιουργήθηκε ο χάρτης για την ίδια περιοχή μελέτης. Τα αποτελέσματα κρίνονται θετικά καθώς η ακρίβεια ταξινόμησης του συνόλου των εικόνων ήταν υψηλή. Αυτό αποδεικνύει ότι η αντικειμενοστραφής χαρτογράφηση των υγροβιοτόπων με εικόνες LANDSAT5 TM είναι δυνατή, ενώ η μεταφορά του μοντέλου σε ίδιες δορυφορικές εικόνες άλλων χρονολογιών, της ίδιας περιοχής μελέτης, είναι εφικτή.
description: The role of wetlands, both ecological and economic, is increasingly recognized and is given special attention to accurate and detailed mapping them. Satellite remote sensing is a practical, efficient and economical method for recording the forest ecosystems. Various methodologies have been developed for processing and analyzing satellite data to create an accurate map. One of the methods adopted last, for mapping wetlands, is the object-based classification of satellite imagery. This paper evaluated the possibility of distinguishing the wetland area and longitudinal changes in it with digital analysis of satellite data. In the beginning, object-based classification model was applied using satellite images LANDSAT5 TM for land cover mapping. Then, the classification model was transferred to the same period satellite images LANDSAT5 TM, chronologically different, the transferability of the object-based model was tested and finally a new map was generated. The results are considered positive, since the accuracy of registration of all images was high. This proves that the object mapping of wetlands with images LANDSAT5 TM is possible while the transfer of the same model at satellite images of dating, the same study area, is feasible.
Casimir-Polder forces on excited atoms in the strong atom-field coupling regime
Creators: name: Buhmann, Stefan Yoshi
name: Welsch, Dirk-Gunnar
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Based on macroscopic quantum electrodynamics in linear media, we develop a general theory of the resonant Casimir-Polder force on an excited two-level atom in the presence of arbitrary linear bodies, with special emphasis on the strong-coupling regime where reabsorption of an emitted photon can give rise to (vacuum) Rabi oscillations. We first derive a simple time-independent expression for the force by using a dressed-state approximation. For initially single-quantum excited atom-field systems we then study the dynamics of the force by starting from the Lorentz force and evaluating its average as a function of time. For strong atom-field coupling, we find that the force may undergo damped Rabi oscillations. The damping is due to the decay of both the atomic excitation and the field excitation, and both amplitude and mean value of the oscillations depend on the chosen initial state.
description: 16 pages, 2 figures, extended version
Demographics and song repertoire sizes of cirl bunting populations
Creators: name: Collins, Sarah
Publisher: name: Zenodo
Year: 2024
Subjects: Song repertoire
Conservation reintroduction
Isolated population
cirl bunting
Emberiza cirlus
song learning

description: In order to improve conservation outcomes translocation or reintroduction of individuals may be necessary. When song learning birds are translocated, changes in the cultural diversity of song repertoires, or abnormal vocalisations, in the new population can be a problem. We monitored song production over 8 years in a reintroduced population of the cirl bunting (Emberiza cirlus). Chicks were removed from nests in Devon, UK, between 2006-2011, translocated at six days old to be hand-reared and released in Cornwall, UK. Recordings at the release site in 2011 showed a significantly reduced population repertoire and individuals sang abnormal song types compared to the source populations in Devon. However, recordings in 2019, showed population song repertoire had reached the level of source populations of similar size, and song types were species typical. Our study shows that species can recover from a cultural bottleneck and suggests that, for some song learning birds, if translocation of nestlings is necessary it may not lead to long-term problems for communication and thus population persistence. For future translocations of nestlings, we recommend that efforts are made to provide tutoring to enable song learning. This may be achieved by providing recordings but may also include providing adult song tutors. In addition, playback of 'normal' songs to translocated populations may aid in development of species typical song repertoires, although care must be taken that this is not disturbing the reintroduced birds.
description: Funding provided by: Seal Hayne Educational Trust*Crossref Funder Registry ID: Award Number:
description: We recorded cirl buntings in 2011 and 2019 at eight locations in Devon (Source) and one in Cornwall (Reintroduced), all within the UK. We recorded songs as WAV files with a sampling rate of 44.1 KHz using a Sennheiser ME66 directional microphone and Marantz Solid State Recorder PMD661 between 0730-1700h throughout May - August in 2011, and June - July in 2019.

We identified songs using spectrograms (FlatTop window; FFT 512, frequency resolution 86 Hz, 93.75% overlap – time resolution 0.72 s) in Avisoft SasLab Pro (Specht, 2002). A library of 54 unique syllable types was created, representing the song types of all individuals recorded. Each individual song spectrogram was visually compared with the reference library of the 54 syllable spectrograms for classification (Fig.4 in the results shows a range of the different syllable types). For each population we calculated the number of different song types (PopRep). We then calculated the Dice sharing index (Dice, 1945) between all possible pairs of populations using the following formula.
Κοινωνική αλληλεπίδραση μαθητών με μαθησιακές δυσκολίες με τους συμμαθητές τους με και χωρίς μαθησιακές δυσκολίες στο πλαίσιο της ένταξης
Creators: name: Ζιώγα, Δήμητρα Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Κοινωνική αλληλεπίδραση
Μαθησιακές δυσκολίες
Πλαίσιο ένταξης
Social interaction
Learning disabilities
Mainstream schools

description: Η παρούσα εργασία πραγματεύεται την κοινωνική αλληλεπίδραση των μαθητών με μαθησιακές δυσκολίες με τους συμμαθητές του με και χωρίς μαθησιακές δυσκολίες στο πλαίσιο της ένταξης. Στην εργασία έγινε παρατήρηση των κοινωνικών συναλλαγών τριών μαθητών με μαθησιακές δυσκολίες με τους συμμαθητές τους με και χωρίς μαθησιακές δυσκολίες, ώστε να διερευνηθεί η συχνότητα και η μορφή των κοινωνικών συναλλαγών. Η παρατήρηση έγινε κατά τη διάρκεια του διαλείμματος και ο συνολικός χρόνος παρατήρησης για κάθε παιδί ήταν 80 λεπτά. Επίσης, έγιναν συνεντεύξεις σε τέσσερις εκπαιδευτικούς της τάξης για να ληφθούν πληροφορίες σχετικά με τις ενέργειες που κάνουν οι ίδιοι για να επηρεάσουν την κοινωνική αλληλεπίδραση των μαθητών με μαθησιακές δυσκολίες με τους συμμαθητές τους χωρίς μαθησιακές δυσκολίες. Τα αποτελέσματα της παρούσας έρευνας έδειξαν ότι οι μαθητές με μαθησιακές δυσκολίες αλληλεπιδρούν συχνότερα με συμμαθητές τους που είτε έχουν κι εκείνοι μαθησιακές δυσκολίες είτε, ακόμα κι αν δεν έχουν, είναι χαμηλότερης σχολικής επίδοσης. Οι εκπαιδευτικοί της τάξης δεν έκαναν ιδιαίτερες ενέργειες για να επηρεάσουν την κοινωνική αλληλεπίδραση των μαθητών με μαθησιακές δυσκολίες με τους συμμαθητές τους χωρίς μαθησιακές δυσκολίες. Στο τέλος της παρούσας έρευνας δίνονται προτάσεις για περαιτέρω διερεύνηση του θέματος.
description: The present scientific assignment treats the social interaction of students with learning disabilities with their classmates with and without learning disabilities in mainstream schools. Within the limits of the assignment there has been an observation of the social interactions of three students with learning disabilities with their classmates with and without learning disabilities for the purpose of studying the type and frequency of the above mentioned social interactions. The observation has taken place during school breaks and the total observation time for each child has been 80 minutes. In addition, four educational instructors have been interviewed for the purpose of collecting information regarding their own actions aiming to influence the social interaction of students with learning disabilities with their classmates without learning disabilities. The results of the present study have revealed that students with learning disabilities interact more frequently with their classmates who, whether they are faced with learning disabilities themselves, or, if not, they have a poorer school attendance. The education instructors of the class did not proceed to important actions in order to influence the social interaction of students with learning disabilities with their classmates without learning disabilities. There are suggestions being presented at the end of the present study for further investigation of this issue.
Orbital densities functional
Creators: name: Anisimov, V. I.
name: Kozhevnikov, A. V.
name: Korotin, M. A.
name: Lukoyanov, A. V.
name: Khafizullin, D. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Local density approximation (LDA) to the density functional theory (DFT) has continuous derivative of total energy as a number of electrons function and continuous exchange-correlation potential, while in exact DFT both should be discontinuous as number of electrons goes through an integer value. We propose orbital densities functional (ODF) (with orbitals defined as Wannier functions) that by construction obeys this discontinuity condition. By its variation one-electron equations are obtained with potential in the form of projection operator. The operator increases a separation between occupied and empty bands thus curing LDA deficiency of energy gap value systematic underestimation. Orbital densities functional minimization gives ground state orbital and total electron densities. The ODF expression for the energy of orbital densities fluctuations around the ground state values defines ODF fluctuation Hamiltonian that allows to treat correlation effects. Dynamical mean-field theory (DMFT) was used to solve this Hamiltonian with quantum Monte Carlo (QMC) method for effective impurity problem. We have applied ODF method to the problem of metal-insulator transition in lanthanum trihydride LaH_{3-x}. In LDA calculations ground state of this material is metallic for all values of hydrogen nonstoichiometry x while experimentally the system is insulating for x < 0.3. ODF method gave paramagnetic insulator solution for LaH_3 and LaH_{2.75} but metallic state for LaH_{2.5}.
description: 35 pages, 5 figures
Pore morphology evolution and atom distribution of doped Fe2O3 foams developed by freeze-casting after redox cycling
Creators: name: LLoreda-Jurado, P. J.
name: Hernandez-Saz, Jesus
name: Chicardi, E.
name: Paul, A.
name: Sepulveda, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Chemical looping water splitting systems operate at relatively high temperatures (450-800 degree C) to produce, purify, or store hydrogen by the cyclic reduction and oxidation (redox) of a solid oxygen carrier. Therefore, to improve long-term operation, it is necessary to develop highly stable oxygen carriers with large specific surface areas. In this work, highly interconnected doped Fe2O3 foams are fabricated through the freeze-casting technique, and the aid of a submicrometric camphene-based suspension to prevent Fe sintering and pore clogging during redox operation. The influence of the dopant elements (Al and Ce) over the pore morphology evolution, and redox performances are examined. The use of an Fe2O3 porous structure with initial pore size above 100 microns shows a significant reduction of the sample densification, and the addition of Al2O3 by the co-precipitation process proves to be beneficial in preventing the generation of a core-shell structure following redox processing.
description: 25 pages, 8 figures
The Landau Pole and $Z^{\prime}$ decays in the 331 bilepton model
Creators: name: Martinez, R.
name: Ochoa, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the decay widths and branching ratios of the extra neutral boson $Z^{\prime}$ predicted by the 331 bilepton model in the framework of two different particle contents. These calculations are performed taken into account oblique radiative corrections, and Flavor Changing Neutral Currents (FCNC) under the ansatz of Matsuda as a texture for the quark mass matrices. Contributions of the order of $10^{-1}-10^{-2}$ are obtained in the branching ratios, and partial widths about one order of magnitude bigger in relation with other non- and bilepton models are also obtained. A Landau-like pole arise at 3.5 TeV considering the full particle content of the minimal model (MM), where the exotic sector is considered as a degenerated spectrum at 3 TeV scale. The Landau pole problem can be avoid at the TeV scales if a new leptonic content running below the threshold at $% 3 $ TeV is implemented as suggested by other authors.
description: 20 pages, 5 figures, LaTeX2e
Quantifying turbulence induced segregation of inertial particles
Creators: name: Calzavarini, Enrico
name: Cencini, Massimo
name: Lohse, Detlef
name: Toschi, Federico
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Particles with density different from that of the advecting turbulent fluid cluster due to the different response of light/heavy particles to turbulent fluctuations. This study focuses on the quantitative characterization of the segregation of dilute poly-disperse inertial particles evolving in turbulent flow, as obtained from Direct Numerical Simulation of the Navier-Stokes equations. We introduce an indicator of segregation amongst particles of different inertia and/or size, from which a length scale r_{seg} quantifying the degree of segregation of two different types of particles is deduced.
description: 4 pages, 5 figures
Hyperplane sections of Legendrian subvarieties
Creators: name: Buczynski, Jaroslaw
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M99

description: We prove that a general hyperplane section of a smooth Legendrian subvariety in a projective space admits Legendrian embedding into another projective space. This gives numerous new examples of smooth Legendrian subvarieties, some of which have positive Kodaira dimension.
description: 9 pages
Ο ρόλος των μορφογενετικών πρωτεϊνών των οστών στην ανάπτυξη του πνεύμονα:
Creators: name: Σουντουλίδης, Αλέξανδρος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Πνεύμονας
Ανάπτυξη
Μορφογενετικές
Lung
Development
BMP

description: Οι Μορφογενετικές Πρωτεΐνες των Οστών (BMPs) αποτελούν μέλη της υπεροικογένειας του Αυξητικού Παράγοντα Μεταμόρφωσης β (TGF-β) και εμπλέκονται σε πληθώρα βιολογικών διεργασιών, μεταξύ των οποίων η ανάπτυξη του πνεύμονα. Ωστόσο ερωτήματα παραμένουν αναφορικά με το Πού, Πότε και σε Ποιούς κυτταρικούς τύπους ενεργοποιείται η σηματοδότηση των Μορφογενετικών Πρωτεϊνών των Οστών κατά την ανάπτυξη του οργάνου. Στόχος της εργασίας ήταν να απαντήσει τα παραπάνω ερωτήματα, κάνοντας χρήση μίας διαγονιδιακής σειράς ποντικού που εκφράζει την Πράσινη Φθορίζουσα Πρωτεΐνη (GFP) υπό τον έλεγχο ενός συνθετικού υποκινητή που αποκρίνεται στη σηματοδότηση των Μορφογενετικών Πρωτεϊνών των Οστών. Με τη χρήση μεθόδων ανοσοφθορισμού παρατηρήσαμε ενεργή σηματοδότηση (1) στο αγγειακό ενδοθήλιο και (2) στο στρώμα των λείων μυϊκών κυττάρων που επενδύουν τους αεραγωγούς, από τα αρχικά στάδια ανάπτυξης. Έπειτα εντοπίστηκε ενεργοποίηση (3) στο βρογχικό επιθήλιο των μεγάλων αεραγωγών και (4) στα σημεία διακλάδωσης του βρογχικού δένδρου, όπου εδράζονται τα Νευροεπιθηλιακά Σώματα. Ενώ μετά την γέννηση, κατά το σχηματισμό των κυψελίδων, ενεργή σηματοδότηση παρατηρήθηκε (5) σε έναν υποπληθυσμό Πνευμονοκυττάρων Τύπου-ΙΙ. Τέλος στον ενήλικο πνεύμονα παρατηρήσαμε πολύ λίγα κύτταρα να δέχονται σηματοδότηση από τις Μορφογενετικές Πρωτεΐνες των Οστών. Τα αποτελέσματα της παρούσας εργασίας παρέχουν τα πρώτα τεκμήρια ότι η σηματοδότηση των Μορφογενετικών Πρωτεϊνών των Οστών εμπλέκεται στην ανάπτυξη και τη διαφοροποίηση συγκεκριμένων κυτταρικών τύπων του αναπτυσσόμενου πνεύμονα.
description: The Bone Morphogenetic Proteins (BMPs) are members of the Transforming Growth Factor beta (TGF-β) superfamily and they participate in many biological processes, including lung development. However, we still do not know Where, When and In Which Cellular Types the BMP signaling is activated during lung development. The purpose of the present study was to answer the above questions, utilizing a transgenenic mouse line expressing the Green Fluorescent Protein (GFP) under the control of a synthetic BMP-responsive promoter. Using immunofluorescence experimental protocols, we mapped, from the early developmental stages, activation of the BMP-signaling (1) in the vascular endothelium and the (2) in the smooth muscle layer which surrounds the airways. Then, activation was observed in (3) bronchial epithelium of large airways and at (4) the airway junctions, where Neuroepithelial bodies are localized. After birth, during alveoli formation, (5) a subpopulation of Type-II Pneumonocytes were targets of active BMP-signaling. Finally, we observed only a few cells to be targets of active BMP-signaling in adult lung. This study provides the first evidences that BMP-signaling participates actively in growth and differentiation of distinct cellular population in the developing lung.
Η διευρεύνηση της ικανοποίησης των γονέων των παιδιών με ειδικές εκπαιδευτικές ανάγκες από τα τμήματα ένταξης των δημοτικών σχολείων:
Creators: name: Τριγώνης, Νικόλαος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ικανοποίηση
Τμήμα ένταξης
Γονείς
Satisfaction
Special education needs
Parents

description: Οι γονείς παίζουν σπουδαίο ρόλο για τα παιδιά με ειδικές εκπαιδευτικές ανάγκες, μεταξύ άλλων, είναι οι κυρίως και φυσικώς υπεύθυνοι που μπορούν να εξασφαλίσουν ότι τα παιδιά τους θα έχουν την πιο κατάλληλη εκπαίδευση. Η ικανοποίηση των γονέων από το τμήμα ένταξης του δημοτικού σχολείου σχετίζεται με την ικανοποίηση από την σχολική πρόοδο του παιδιού τους, από την συναισθηματική και κοινωνική ανάπτυξή του καθώς και από την επαγγελματική ικανότητα του εκπαιδευτικού να ανταποκριθεί στο διδακτικό, κοινωνικό και συμβουλευτικό του ρόλο . Η ικανοποίηση που οι γονείς μπορεί να έχουν από το τμήμα ένταξης σχετίζεται, επίσης, με την επικοινωνία με τον εκπαιδευτικό και τη συνεργασία τους με το σχολείο και ειδικότερα με το τμήμα ένταξης.Σκοπός της παρούσας εργασίας είναι να διερευνήσει το βαθμό της ικανοποίησης των γονέων από τα τμήματα ένταξης των δημοτικών σχολείων. Επίσης να σκιαγραφήσει το περιεχόμενο της συμμετοχής των γονέων και σε ποιο βαθμό η επικοινωνία και συνεργασία τους με τα τμήματα ένταξης επιδρά στην ικανοποίηση που νιώθουν από τα τμήματα ένταξης των δημοτικών σχολείων.
description: The parents play important role for the children with special educational needs, inter alia, are the mainly and naturally persons in charge that can ensure that their children will have the most suitable education. The satisfaction of parents from the department of integration of municipal school is related with the satisfaction by the school progress of their child, by his sentimental and social growth as well as by the professional faculty of teacher to be corresponded in his instructive, social and advisory role. The satisfaction that the parents can have from the department of integration is related, also, with the communication with the teacher and their collaboration with the school and more specifically with the department of integration.Aim of present work is to investigate the degree of satisfaction of parents from the departments of integration of municipal schools. Also it sketches out the content of attendance of parents in who degree the communication and their collaboration with the departments of integration affect in the satisfaction that they feel from the departments of integration of municipal schools.
Freak observers and the measure of the multiverse
Creators: name: Vilenkin, Alexander
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I suggest that the factor $p_j$ in the pocket-based measure of the multiverse, $P_j=p_j f_j$, should be interpreted as accounting for equilibrium de Sitter vacuum fluctuations, while the selection factor $f_j$ accounts for the number of observers that were formed due to non-equilibrium processes resulting from such fluctuations. I show that this formulation does not suffer from the problem of freak observers (also known as Boltzmann brains).
description: 6 pages, no figures; references added
Caregivers in nonprofit and private child care centers: a qualitative analysis of perceptions of auspice and job satisfaction
Creators: name: Clark, Kathryn Anne Mack
Publisher: name: University of British Columbia
Year: 2009

description: This study focused on two factors, auspice and job satisfaction, which have been shown to impact on the quality of child care programs. However, while research has indicated that auspice, job satisfaction, and program quality are intertwined, there is a lack of research which explores these factors qualitatively. There is also a dearth of research which has considered auspice from the caregivers' perspectives. Hence, the purpose of this study was to explore the meaning that caregivers give to auspice in their work in nonprofit and for-profit child care centers. As well, this study sought to examine the relationship between auspice and job satisfaction from the caregiver's point of view, paying close attention to differences in job satisfaction that existed between staff employed in nonprofit centers and staff who worked in private or for-profit centers. A series of qualitative, in-depth interviews were conducted with eight child care workers from the Vancouver Metropolitan area. Four of the participants were employed in or owned private centers and four of the participants worked in nonprofit centers. Positive and negative perceptions of both nonprofit and private auspice emerged. In particular, the nonprofit participants believed that child care should be operated as a service and not a business. They perceived that the motive to make a profit in child care lead for-profit centers to sacrifice quality in order to cut costs and maximize profits. On the other hand, the for- profit participants perceived that their centers provided high quality care and were dedicated to putting the needs of children and staff first. In general, the participants'' perceptions of factors that influenced their job satisfaction were similar across auspices. The nature of child care work and supportive relationships with co-workers were factors which positively influenced job satisfaction while the perceived lack of status in the eyes of society negatively affected satisfaction. Differences in job satisfaction according to auspice were found on several factors, such as government policies and a perceived lack of enough time to accomplish job duties.
Anisotropic static solutions in modelling highly compact bodies
Creators: name: Chaisi, M.
name: Maharaj, S. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Einstein field equations for anisotropic spheres are solved and exact interior solutions obtained. This paper extends earlier treatments to include anisotropic models which accommodate a wider variety of physically viable energy densities. Two classes of solutions are possible. The first class contains the limiting case $μ\propto r^{-2}$ for the energy density which arises in many astrophysical applications. In the second class the singularity at the center of the star is not present in the energy density. The models presented in this paper allow for increasing and decreasing profiles in the behavior of the energy density.
description: 9 pages, to appear in Pramana - J. Phys
Ηλεκτρονική πλατφόρμα διαχείρισης ονομάτων: λεξιλογική μελέτη με διδακτικές προεκτάσεις: η περίπτωση του ονόματος στην αεροπορία
Creators: name: Σαββουλίδου, Σοφία Κοσμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Λεξικολογία
Διδακτική
Αεροπορία
Lexicology
Teaching/Education
Aviation

description: Η παρούσα εργασία εντάσσεται στα πλαίσια της Ονοματολογίας. Γίνεται παρουσίαση και λεξιλογική μελέτη των αεροσκαφών των ελληνικών αεροπορικών εταιριών από το Β’ Παγκόσμιο Πόλεμο έως σήμερα. Στόχος της εργασίας είναι να δημιουργηθεί ένα πρωτότυπο θέμα και να ευαισθητοποιηθεί ο αναγνώστης – μελετητής – ερευνητής στο ρόλο που τα ονόματα διαδραμάτισαν στο γενικό γλωσσικό σύστημα, στη σχέση αυτών με την κοινωνία και τέλος να χρησιμοποιηθεί ως ένα εργαλείο / βοήθημα στη διδακτική με μια μορφή ηλεκτρονικής πλατφόρμας, η οποία ονομάζεται «wiki». Στη συγκεκριμένη πλατφόρμα υπάρχουν με αλφαβητική σειρά όλες οι ελληνικές αεροπορικές εταιρίες και τα αεροσκάφη τους, με τη μορφή λεξικού, για την καλύτερη αναζήτηση, παρουσίαση και στη συνέχεια μελέτη του λεξικού.
description: The present thesis pertains in the field of Nomenclature. The names of the aircrafts of the greek airlines are being presented from the Second Civil War until nowadays as well as a lexical study is being done. The aim of the current thesis is to be created an original subject and also the reader - student - searcher to be familiarized with the role that the names played in the general linguistic system, the relation of the names with the society and finally to be used as a tool in teaching with the form of an electronic platform, called “wiki”. In the specific platform the greek airlines are being presented alphabetically with their aircrafts, in the form of a dictionary, for the better search, presentation and then the better study of the dictionary.
Harkenrider: Introduction to the Charles Grandison Finney Letter
Creators: name: Harkenrider, Zach
Publisher: name: University of Rochester
Year: 2024
Subjects: classificationCode: 43
subject: History, heritage and archaeology
classificationCode: 430321
subject: North American history
classificationCode: 470307
subject: English language

description: Students in two of Professor Robert Westbrook's courses in American intellectual history, "The American Mind, 1600-1865" (History 267) and "The American Mind, 1865-1990" (History 268), use manuscript materials as part of a research assignment. This assignment, called "Other People's Mail," requires that students transcribe a document and write an introduction to it, placing the document in its context and suggesting the ways in which it bears on significant themes in the course.

Please Note: All rights regarding the papers rest with the authors. The images of the manuscripts may not be reproduced without obtaining prior written permission from the Department of Rare Books and Special Collections.
This document was adapted from a webpage hosted on the Rare Books, Special Collections, and Manuscripts website, before being converted into a static document and uploaded to URRR on 2024-10-05.
Phase Transition and Thermal Fluctuations of Quintessential Kerr-Newman-AdS Black Hole
Creators: name: Sharif, M.
name: Ama-Tul-Mughani, Qanitah
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper is devoted to analyzing the critical phenomenon and phase transition of quintessential Kerr-Newman-anti-de Sitter black hole in the framework of Maxwell equal-area law. For this purpose, we first derive thermodynamic quantities such as Hawking temperature, entropy and angular momentum in the context of extended phase space. These quantities satisfy Smarr-Gibbs-Dehum relation in the presence of quintessence matter. We then discuss the critical behavior of thermodynamic quantities through two approaches, i.e., van der Waals-like equation of state and Maxwell equal-area law. It is found that the latter approach is more effective to analyze the critical behavior of the complicated black holes. Using equal-area law, we also study phase diagram in $T-S$ plane and find an isobar which shows the coexistence region of two phases. We conclude that below the critical temperature, black holes show a similar phase transition as that of van der Waals fluid. Finally, we study the effects of thermal fluctuations on the stability of this black hole.
description: 26 pages, 8 figures, to appear in Phys. Dark Universe
Elastic neutron scattering models for NCrystal
Creators: name: Kittelmann, Thomas
name: Cai, Xiao-Xiao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The NCrystal library provides a range of models for simulation of both elastic and inelastic scattering of thermal neutrons in a range of material structures. This article presents the available models for elastic scattering, and includes detailed discussion of their theoretical background, their implementation, and in particular their validation. The lineup includes a model for Bragg diffraction in crystal powders as well as one for incoherent elastic scattering, but the main focus is given to models of Bragg diffraction in ideally imperfect single crystals: both for the most widely applicable model of isotropic Gaussian mosaicity, and for a more specific model of layered single crystals which is relevant for materials such as pyrolytic graphite. Although these single crystal models are utilising computationally efficient approximations where appropriate, attention is given to the provision of precise and trustworthy results also for the extreme cases of back-scattering, forward-scattering, and crystals with very large mosaic spreads. Together with NCrystal's other features for crystal structure initialisation and inelastic physics, the presented models enable realistic modelling of components at neutron scattering instruments in frameworks like Geant4 and McStas, including monochromators, analysers, filters, support materials, shielding, and many kinds of samples. As a byproduct of the work, an improved formula for approximating cross sections in isotropic single crystals with Gaussian mosaicity is provided.
description: Submitted to Computer Physics Communications
Effect of small particles on the near-wall dynamics of a large particle in a highly bidisperse colloidal solution
Creators: name: Bhattacharya, S.
name: Blawzdziewicz, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider the hydrodynamic effect of small particles on the dynamics of a much larger particle moving normal to a planar wall in a highly bidisperse dilute colloidal suspension of spheres. The gap $h_0$ between the large particle and the wall is assumed to be comparable to the diameter $2a$ of the smaller particles so there is a length-scale separation between the gap width $h_0$ and the radius of the large particle $b<
description: 11 pages, 5 figures
Αντίληψη και δημιουργία στην αισθητική θεωρία του Gombrich:
Creators: name: Αντωνιάδης, Χρήστος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Συστηματική Φιλοσοφία
Systimatic Philosophy

description: Σκοπός της διπλωματικής εργασίας ήταν η παρουσίαση της αισθητικής θεωρίας του Gombrich. Αρχικά, έγινε μια σύντομη αναφορά στις επιρροές που δέχτηκε ο Gombrich στα φοιτητικά του, και όχι μόνο, χρόνια από τους δασκάλους του στη Βιέννη. Έπειτα παρουσιάστηκαν οι θέσεις του για τον νατουραλισμό στην τέχνη, ως προπομπός της θεωρίας του. Στη συνέχεια παρουσιάστηκαν τα δυο σκέλη της θεωρίας του, η θεωρία της αντίληψης και η θεωρία της δημιουργίας που αποτελούν ουσιαστικά τις δυο όψεις της κεντρικής θέσης του για τον τρόπο με τον οποίο λειτουργεί, εν γένει, ο ανθρώπινος νους. Ακολούθησε μια ενότητα κατά την οποία εκτέθηκαν οι βασικότερες αντιρρήσεις που εγείρει η θεωρία του και τέλος έγινε μια αναφορά στις φιλοσοφικές ερμηνείες που έχουν διατυπωθεί ή μπορούν να διατυπωθούν με βάση το συνολικό έργο του.
description: The aim of this thesis was the presentation of Gombrich’s aesthetic theory. Initially, there was a brief reference to the influences on student Gombrich, by his teachers in Vienna. Then we presented his view on naturalism in art, as a forerunner of the theory. Then we presented the two arms of his theory -the theory of perception and the theory of creation- as the two sides of his central position on how the human mind generally works, followed by a section which contained the main objections raised by his theory. Finally, there was a brief reference in philosophical interpretations that have been or may be made based on his total work.
Introduction to Stephen S. Foster's Letter to Richard D. Webb
Creators: name: Troyer, Mariko
Publisher: name: University of Rochester
Year: 2024
Subjects: classificationCode: 43
subject: History, heritage and archaeology
classificationCode: 430321
subject: North American history
classificationCode: 470307
subject: English language

description: Students in two of Professor Robert Westbrook's courses in American intellectual history, "The American Mind, 1600-1865" (History 267) and "The American Mind, 1865-1990" (History 268), use manuscript materials as part of a research assignment. This assignment, called "Other People's Mail," requires that students transcribe a document and write an introduction to it, placing the document in its context and suggesting the ways in which it bears on significant themes in the course.

Please Note: All rights regarding the papers rest with the authors. The images of the manuscripts may not be reproduced without obtaining prior written permission from the Department of Rare Books and Special Collections.
This document was adapted from a webpage hosted on the Rare Books, Special Collections, and Manuscripts website, before being converted into a static document and uploaded to URRR on 2024-10-03.
ISM studies of GRB 030329 with high resolution spectroscopy
Creators: name: Thoene, Christina C.
name: Greiner, Jochen
name: Savaglio, Sandra
name: Jehin, Emmanuel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a series of early UVES/VLT high resolution spectra of the afterglow of GRB 030329 at redshift z=0.16867+-0.00001. In contrast to other spectra from this burst, both emission and absorption lines were detected. None of them showed any temporal evolution. From the emission lines, we determine the properties of the host galaxy which has a star formation rate (SFR) of 0.198 M_solar yr^-1 and a low metallicity of 1/7 Z_solar. Given the low total stellar host mass M_star=10^7.75+-0.15 M_solar and an absolute luminosity m_V=-16.37, we derive specific SFRs (SSFR) of log SFR/M = -8.5 yr^-1 and SFR/L = 14.1 M_solar yr^-1 L_*^-1. This fits well into the picture of GRB hosts as being low mass, low metallicity, actively star forming galaxies. The MgII and MgI absorption lines from the host show multiple narrow (Doppler width b=5-10 km/s) components spanning a range of v about 260 km/s, mainly blueshifted compared to the redshift from the emission lines. These components are likely probing outflowing material of the host galaxy, which could arise from former galactic superwinds, driven by supernovae from star forming regions. Similar features have been observed in QSO spectra. The outflowing material is mainly neutral with high column densities of log N(MgII)=14.0+-0.1 cm^-2 and log N(MgI)=12.3+-0.1 cm^-2.
description: 11 pages, 4 figures, submitted to ApJ
Acoustic scattering simulations in coupled fluid-porous media problems
Creators: name: Nayak, Ashwin
name: Prieto, Andrés
name: Fernandez-Comesaña, Daniel
Publisher: name: Zenodo
Year: 2019
Subjects: acoustics, scattering, coupling, porous

description: Sound-intensity sensors are sensitive to flow conditions and utilize porous windscreens to mitigate induced noise. Introduction of an effective windscreen requires development of a coupled mathematical model accounting for acoustic transmission across the porous media layer around the probe. We utilize the finite element method along with perfectly matched layers to study the scattering of a plane wave by such representative configurations under no flow conditions.
Rashba quantum wire: exact solution and ballistic transport
Creators: name: Perroni, C. A.
name: Bercioux, D.
name: Ramaglia, V. M.
name: Cataudella, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The effect of Rashba spin-orbit interaction in quantum wires with hard-wall boundaries is discussed. The exact wave function and eigenvalue equation are worked out pointing out the mixing between the spin and spatial parts. The spectral properties are also studied within the perturbation theory with respect to the strength of the spin-orbit interaction and diagonalization procedure. A comparison is done with the results of a simple model, the two-band model, that takes account only of the first two sub-bands of the wire. Finally, the transport properties within the ballistic regime are analytically calculated for the two-band model and through a tight-binding Green function for the entire system. Single and double interfaces separating regions with different strengths of spin-orbit interaction are analyzed injecting carriers into the first and the second sub-band. It is shown that in the case of a single interface the spin polarization in the Rashba region is different from zero, and in the case of two interfaces the spin polarization shows oscillations due to spin selective bound states.
Assessment of the population structure and temporal changes in spatial dynamics and genetic characteristics of the Atlantic bluefin tuna under a fishery independent framework.
Creators: name: Puncher, Gregory Neils <1980>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: BIO/05 Zoologia

description: As a large and long-lived species with high economic value, restricted spawning areas and short spawning periods, the Atlantic bluefin tuna (BFT; Thunnus thynnus) is particularly susceptible to over-exploitation. Although BFT have been targeted by fisheries in the Mediterranean Sea for thousands of years, it has only been in these last decades that the exploitation rate has reached far beyond sustainable levels. An understanding of the population structure, spatial dynamics, exploitation rates and the environmental variables that affect BFT is crucial for the conservation of the species. The aims of this PhD project were 1) to assess the accuracy of larval identification methods, 2) determine the genetic structure of modern BFT populations, 3) assess the self-recruitment rate in the Gulf of Mexico and Mediterranean spawning areas, 4) estimate the immigration rate of BFT to feeding aggregations from the various spawning areas, and 5) develop tools capable of investigating the temporal stability of population structuring in the Mediterranean Sea. Several weaknesses in modern morphology-based taxonomy including demographic decline of expert taxonomists, flawed identification keys, reluctance of the taxonomic community to embrace advances in digital communications and a general scarcity of modern user-friendly materials are reviewed. Barcoding of scombrid larvae revealed important differences in the accuracy of the taxonomic identifications carried out by different ichthyoplanktologists following morphology-based methods. Using a Genotyping-by-Sequencing a panel of 95 SNPs was developed and used to characterize the population structuring of BFT and composition of adult feeding aggregations. Using novel molecular techniques, DNA was extracted from bluefin tuna vertebrae excavated from late iron age, ancient roman settlements Byzantine-era Constantinople and a 20th century collection. A second panel of 96 SNPs was developed to genotype historical and modern samples in order to elucidate changes in population structuring and allele frequencies of loci associated with selective traits.
Average and recommended half-life values for two neutrino double beta decay: upgrade'05
Creators: name: Barabash, A. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: All existing ``positive'' results on two neutrino double beta decay in different nuclei were analyzed. Using the procedure recommended by the Particle Data Group, weighted average values for half-lives of $^{48}$Ca, $^{76}$Ge, $^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{100}$Mo - $^{100}$Ru ($0^+_1$), $^{116}$Cd, $^{150}$Nd, $^{150}$Nd - $^{150}$Sm ($0^+_1$) and $^{238}$U were obtained. Existing geochemical data were analyzed and recommended values for half-lives of $^{128}$Te, $^{130}$Te and $^{130}$Ba are proposed. We recommend the use of these results as presently the most precise and reliable values for half-lives.
description: 11 pages, Contribution to MEDEX'05, Corfu, Greece, September 26-29, 2005; to be published in Czech.J.Phys; v2: minor changes
DBTagger: Multi-Task Learning for Keyword Mapping in NLIDBs Using Bi-Directional Recurrent Neural Networks
Creators: name: Usta, Arif
name: Karakayali, Akifhan
name: Ulusoy, Özgür
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Translating Natural Language Queries (NLQs) to Structured Query Language (SQL) in interfaces deployed in relational databases is a challenging task, which has been widely studied in database community recently. Conventional rule based systems utilize series of solutions as a pipeline to deal with each step of this task, namely stop word filtering, tokenization, stemming/lemmatization, parsing, tagging, and translation. Recent works have mostly focused on the translation step overlooking the earlier steps by using ad-hoc solutions. In the pipeline, one of the most critical and challenging problems is keyword mapping; constructing a mapping between tokens in the query and relational database elements (tables, attributes, values, etc.). We define the keyword mapping problem as a sequence tagging problem, and propose a novel deep learning based supervised approach that utilizes POS tags of NLQs. Our proposed approach, called \textit{DBTagger} (DataBase Tagger), is an end-to-end and schema independent solution, which makes it practical for various relational databases. We evaluate our approach on eight different datasets, and report new state-of-the-art accuracy results, $92.4\%$ on the average. Our results also indicate that DBTagger is faster than its counterparts up to $10000$ times and scalable for bigger databases.
description: To appear in VLDB 2021
The role of the teacher during free play in preschool
Creators: name: Breen, Patricia Edith
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this observational study is to examine the role of the teacher during free play in preschool. The specific objectives are to document: the duration and extent of supervisory, facilitating and housekeeping duties; various aspects of teacher-child interactions such as reason, location, language mode, duration of the exchange including number and gender of children; and to determine if boys and girls are equally demanding of the teacher's time and attention. The nature of unsolicited attention is recorded and the teacher's responses to given situations are noted to determine if gender differences exist. Successive naturalistic observations of six different teachers were undertaken at four separate preschool centres in Vancouver, Canada. An attempt was made to seek a representative sample of both teachers and schools. Extensive field notes documenting the teachers' duties, behaviors and interactions with the children provide the observational data. This data, comprising some thirty hours of observations, was analyzed and interpreted with reference to the above research questions. The data shows that these six teachers spent an average of 80 percent of the free play period in classroom management. That is, they were predominantly involved in housekeeping, facilitating and supervising the play environment interspersed with momentary and fragmented interactions with children. The remaining 20 percent of the time, the teachers were engaged in sustained interactions (over 2 minutes) with the children. The sustained interaction data shows distinct variations along gender lines. While language facilitation was the main reason for teacher/child interactions, definite gender variations were reflected in the reasons for interaction, the nature of the verbal exchanges, as well as the duration and boy/girl ratio of the interaction episodes. When the context of the interactions was considered it was apparent that approximately one third of the teacher/child interactions were in the area of art activities, while the teachers' presence in other areas of the play environment was significantly less well represented. The study concludes that the teacher's role during free play was predominantly one of managing the environment. This preoccupation with making sure that the play scene proceeds smoothly and harmoniously left little remaining time for more educationally valuable interactions with the children.