cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Πειραματική Ανάλυση και Βελτιστοποίηση της Μεθόδου Γονιδιακής Τροποποίησης CRISPR/Cas σε Ανθρώπινες Κυτταρικές Σειρές. Μελέτη των Εφαρμογών της στη Φαρμακευτική και Εμβιομηχανική
Creators: name: Ουρανίδης, Ανδρέας Παρασκευά
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Εμβιομηχανική
Γενωμική Μετάλλαξη
Συνθετική βιολογία
Bioengineering
Genomic Mutation
Synthetic Biology

description: H τεχνολογία CRISPR / Cas9 είναι η σημαντικότερη ανακάλυψη της γενωμικής μηχανικής και οδηγεί την εποχή της επανάστασης της συνθετικής βιολογίας. Συνιστά πολύτιμο μηχανισμό προσαρμοστικής ειδικής ανοσίας των προκαρυωτικών οργανισμών και αποτελείται i) από θραύσματα ριβονουκλεϊκού οξέος (sgRNAs) τα οποία οδηγούν την νουκλεάση Cas9 στα σημεία κατάτμησης ii) από την Cas9 η οποία επάγει την κατάτμηση της διπλής έλικας του κυτταρικού DNA μεταξύ των γονιδιακών τόπων τα της προεπιλεγμένης νουκλεοτιδικής αλληλουχίας. Παρά τη διαφαινόμενη δυναμική της CRISPR / Cas9 τόσο στην έρευνα όσο και σε θεραπευτικές προσεγγίσεις, αρκετές βελτιώσεις οφείλουν να επιτευχθούν ακόμη στα πεδία εκλεκτικότητας, αποτελεσματικότητας και χωροχρονικού ελέγχου της δράσης της. Η αμεσότερη των προκλήσεων αυτών αφορά την ανάπτυξη μιας αποτελεσματικής μεθόδου χορήγησης της τεχνολογίας, με ασφάλεια σε ανθρωπινά κύτταρα. Στην παρούσα μελέτη υιοθετείται μια συστηματική προσέγγιση αναγνώρισης και βελτιστοποίησης των αποτελεσματικότερων οχημάτων μεταφοράς της Cas9 και sgRNAs στα ευκαρυωτικά κύτταρα 293 FT.Η προσέγγιση καλύπτει τόσο το μηχανισμό της μη ομόλογης σύνδεσης άκρων όσο και της ομόλογης κατευθυνόμενης επιδιόρθωσης
description: CRISPR/Cas9 is leading the era of synthetic biology as the most prominent discovery of the genetic engineering field. The wild CRISPR - Cas9 genome - editing system is a significant part of the adaptive immune system in archaea and bacteria and consists of two components i) the single guide RNA (sgRNA) that recognizes the targeted sequence in the genome and ii) the Cas9 nuclease that acts as a pair of scissors and thus cleaves the double strands of DNA. Since its discovery the CRISPR-Cas9 system has triggered enormous interest in therapeutic applications. Despite the great promise of the technology, several challenges (selectivity, efficiency, spatiotemporal control) remain to be tackled before it’s advancement towards successful applications το clinical settings. The most urgent of these challenges is the safe and efficient delivery of the CRISPR-Cas9 genome-editing system to human cells. In this study a systematic approach is adopted in order to investigate and optimize the most efficient vehicles of Cas9 and sgRNA delivery to the 293FT human cell line. This approach overarches both the mechanisms of the Non-Homologous End Joining and the Homology Directed Repair
Towards a full Heusler alloy showing room temperature half-metallicity at the surface
Creators: name: Cinchetti, M.
name: Wüstenberg, J. -P.
name: Albaneda, M. Sánchez
name: Steeb, F.
name: Conca, A.
name: Jourdan, M.
name: Aeschlimann, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this article we investigate the surface spin polarization in a 100 nm Co2Cr0.6Fe0.4Al (CCFA) film grown ex situ epitaxially on MgO(100) with a 10 nm Fe buffer layer by means of spin resolved photoemission. We show that a careful in situ preparation of the sample surface leads to values for the room temperature spin polarization up to 45% at the Fermi level. To our knowledge, this is the highest value measured so far at the surface region of a full Heusler alloy at room temperature.
description: 8 pages, 3 figures; submitted to J. Phys. D: Appl. Phys
Towards a questionnaire regarding management and performance outcomes for preschool CI populations
Creators: name: Καισαρίδου, Μαγδαληνή Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Κοχλιακά εμφυτεύματα
Διαχείριση
Επίδοση
Cochlear implants
Management
Outcomes

description: Αfter examining the consequences of deafness in children, the solution of the cochlear implantation and its benefits to children's communication, the present postgraduate thesis created a questionnaire. This questionnaire studies both the factors associated with the management of the hearing recovery process and the achievement indicators in communication of preschool implanted children. The CI.A.O. questionnaire was created from the synthesis of 6 related questionnaires. The exploited questionnaires were the CAP, SIR, GBI, LittlEARS, Sanders and the "ATTIKON and AHEPA University Clinics Questionnaire". The distribution of the questionnaire to a large sample of preschool cochlear implanted children in the near future as well as the analysis of its outcomes are likely to provide a useful guide for parents and specialists for deaf children which will guide and encourage them during the child's rehabilitation process after the implantation.
description: Η παρούσα εργασία αφού μελέτησε τις συνέπειες της κώφωσης στα παιδιά, την λύση της κοχλιακής εμφύτευσης και τα οφέλη της στην επικοινωνία των παιδιών, δημιούργησε ένα ερωτηματολόγιο. Αυτό το ερωτηματολόγιο μελετά ταυτόχρονα τους παράγοντες που σχετίζονται με τη διαχείριση της πορείας αποκατάστασης της ακοής και τους δείκτες επίτευξης των παιδιών προσχολικής ηλικίας με κοχλιακό εμφύτευμα στους τομείς της επικοινωνίας. Το ερωτηματολόγιο CI.A.O. προήλθε από τη σύνθεση ερωτήσεων 6 σχετικών ερωτηματολογίων. Τα ερωτηματολόγια που χρησιμοποιήθηκαν ήταν τα CAP, SIR, GBI, LittlEARS, Sanders και το "Ερωτηματολόγιο των Πανεπιστημιακών Κλινικών ΑΤΤΙΚΟΝ και ΑΧΕΠΑ". Η μελλοντική χορήγηση του ερωτηματολογίου σε μεγάλο δείγμα πληθυσμού και η ανάλυση των αποτελεσμάτων του είναι πιθανό να δημιουργήσει έναν χρήσιμο οδηγό για τους γονείς, αλλά και για τους ειδικούς γιατρούς για τα κωφά παιδιά, το οποίο θα τους καθοδηγεί και θα τους ενθαρρύνει κατά την πορεία αποκατάστασης του παιδιού μετά την εμφύτευση.
A bistable reaction--diffusion system in a stretching flow
Creators: name: Cox, Stephen M.
name: Gottwald, Georg A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We examine the evolution of a bistable reaction in a one-dimensional stretching flow, as a model for chaotic advection. We derive two reduced systems of ordinary differential equations (ODE's) for the dynamics of the governing advection--reaction--diffusion partial differential equation (PDE), for pulse-like and for plateau-like solutions, based on a non-perturbative approach. This reduction allows us to study the dynamics in two cases: first, close to a saddle--node bifurcation at which a pair of nontrivial steady states are born as the dimensionless reaction rate (Damkohler number) is increased, and, second, for large Damkohler number, far away from the bifurcation. The main aim is to investigate the initial-value problem and to determine when an initial condition subject to chaotic stirring will decay to zero and when it will give rise to a nonzero final state. Comparisons with full PDE simulations show that the reduced pulse model accurately predicts the threshold amplitude for a pulse initial condition to give rise to a nontrivial final steady state, and that the reduced plateau model gives an accurate picture of the dynamics of the system at large Damkohler number.
description: accepted for publication in Physica D
Ανάπτυξη και επικύρωση μεθόδου για τον ταυτόχρονο προσδιορισμό νικοτίνης και νιτροζαμινών με τεχνική UPLC-MS/MS
Creators: name: Παναγούλης, Θεόδωρος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: UPLC-MS/MS
Νικοτίνη
Νιτροζαμίνες
Nicotine
TSNAs

description: Το κάπνισμα αποτελεί τη σημαντικότερη αιτία πρόκλησης καρκίνου και ευθύνεται για περίπου 30% του συνόλου των θανάτων από καρκίνο.36 Υπάρχουν όμως και άλλες μορφές καπνίσματος που δεν είναι και τόσο διαδεδομένες σε όλες τις χώρες. Μια από αυτές είναι το κάπνισμα με καπνό που δεν απαιτεί καύση, smokeless tobacco. Έχει λοιπόν ιδιαίτερο ενδιαφέρον να μελετήσουμε την διαπερατότητα των καρκινογόνων ουσιών στον οργανισμό από τέτοια σκευάσματα καπνού. Στην παρούσα εργασία γίνεται ανάπτυξη και επικύρωση μεθόδου για τον ταυτόχρονο προσδιορισμό Νικοτίνης και των νιτροζαμινών ΝΝΝ και ΝΝΚ σε δύο διαφορετικά υποστρώματα, σε διαλύματα PBS και σε ιστό. Αρχικά, λοιπόν, βελτιστοποιήθηκε η διαδικασία προκατεργασίας των δειγμάτων, που και στις δύο περιπτώσεις απαιτείται εκχύλιση, ώστε να έχουμε τελικά αποδεκτές ανακτήσεις από 73-98%. Στη συνέχεια έγινε επικύρωση της μεθόδου για όλες τις ενώσεις ως προς την ακρίβεια και την επαναληψιμότητα, την σταθερότητα, την γραμμικότητα και υπολογίστηκαν τα όρια ανίχνευσης και ποσοτικού προσδιορισμού. Η μέθοδος ήταν ακριβής (κάτω από +/- 18%) και επαναλήψιμη (RSD <15% για της χαμηλές συγκεντρώσεις). Ο συντελεστής προσδιορισμού (R2) κυμάνθηκε μεταξύ 0,9959 και 0,9997, ενώ το LOD είναι 1 ng/mL για Νικοτίνη και 0,005 και 0,007 ng/mL για ΝΝΚ-ΝΝΝ.Η μέθοδος τελικά εφαρμόστηκε σε δείγματα που προέκυψαν για την μελέτη διαπερατότητας των προσδιοριζόμενων ουσιών από εμπορικά σκευάσματα καπνού που δεν απαιτούν καύση αλλά καταναλώνονται κατά την παραμονή τους στην στοματική κοιλότητα.
description: Smoking is the major cause of cancer and is responsible for about 30% of all cancer related deaths36. There are also some forms of smoking that are not as widespread as in all countries. “Smokeless tobacco” is a tobacco product that is not smoked but is used in another form such as chewing tobacco or snuff. Therefore, it is of particular importance to study the permeability of carcinogenic substances from such forms of tobacco. In this study we develop and validate a method for the simultaneous determination of nicotine and nitrosamines NNN and NNK in two different substrates, in PBS solutions and tissue. Sample preparation and extraction was optimized as required, so we finally achieve recoveries of 73-97%. The method was then validated for all compounds in terms of precision and repeatability, stability, linearity, and the detection and quantification limits. The method was accurate (below +/- 18%) and repeatable (RSD <15% for low concentrations). The linear regression correlation coefficient (R2) ranged from 0.9959 to 0.9997, while LOD was 1 ng/mL for Nicotine and 0.005 and 0.007 ng/ mL for NNK-NNN. Finally, samples obtained from permeability studies were analyzed to identify substances of commercial tobacco products.
Διαμεσολάβηση, Διαιτησία και Διαμεσοδιαιτησία
Creators: name: Παπαδοπούλου, Ευγνωσία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διαιτησία
Διαμεσολάβηση
Διαμεσοδιαιτησία
Mediation
Arbitration
Med-Arb

description: Σκοπός της διπλωματικής εργασίας ήταν η μελέτη της υβριδικής μεθόδου ή μηχανισμού επίλυσης διαφοράς που καλείται διαμεσοδιαιτησία. Πρόκειται για ένα θεσμό που συνδυάζει χαρακτηριστικά των θεσμών τόσο της διαμεσολάβησης όσο και της διαιτησίας οι οποίοι θεσμοί εναλλάσσονται ενίοτε σε διακριτά στάδια και ενίοτε ταυτόχρονα. Εξετάστηκαν ορισμένες ιδιαιτερότητες των συστατικών στοιχείων του θεσμού, ήτοι της αμιγούς διαμεσολάβησης και της αμιγούς διαιτησίας. Στη συνέχεια, αναπτύχθηκαν ορισμένα απο τα βασικά επιμέρους μοντέλα που συναποτελούν τη διαμεσοδιαιτησία, όπως επίσης η ιστορική εξέλιξη του θεσμού και το πεδίο εφαρμογής του σύμφωνα με τη διεθνή πρακτική. Ακόμη παρατέθηκε ο επιστημονικός και ο δικαστικός διάλογος αναφορικά με τη συμφωνία διαμεσοδιαιτησίας και την ενεργοποίησή της. Ένα άλλο θέμα που εξετάστηκε ήταν οι περιπλοκές απο την εμπλοκή του ίδιου ουδέτερου τρίτου ως διαμεσο-διαιτητή καθώς και ζητήματα σχετικά με την εκτέλεση των συμφωνιών-αποφάσεων που προκύπτουν στα πλαίσια του υπο μελέτη θεσμού. Τέλος, εξάχθηκαν συμπεράσματα αναφορικά με τη χρησιμότητα και τον τρόπο αξιοποίησης του θεσμού καθώς και ζητήματα συμβατότητάς του με το ισχύον εθνικό νομοθετικό πλαίσιο.
description: The aim of the present thesis was to study the hybrid form or mechanism of the dispute resolution referred to as mediation-arbitration. It concerns a statute that combines the characteristics of both mediation and arbitration, which sometimes alternate in distinct stages and sometimes simultaneously. Some features of the constituent elements of the statute namely purely mediation and purely arbitration, were examined. Subsequently, some of the key sub-models that constitute mediation-arbitration, as well as the historical evolution of the statute and its scope according to international practice were developed. The scientific and judicial dialogue on the mediation-arbitration agreement and its enforcement was also cited. An additional issue that was dealt with included the complications of the participation of the same neutral third party as mediator –arbitrator as well as issues related to the implementation of the consent-agreements resulting from the statute of the current thesis. Finally, conclusions were drawn regarding the usefulness and the way of using the statute as well as its compatibility with the current national legislative framework.
Recording vocabulary strategies in dedicated language learning strategies
Creators: name: Γεωργοπούλου, Ιωάννα Χαράλαμπου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Εκμάθηση λεξιλογίου
Στρατηγικές εκμάθησης λεξιλογίου
Χρήση της τεχνολογίας και του ίντερνετ στην εκμάθηση λεξιλογίου
Vocabulary learning
Vocabulary learning and strategies
Use of technology and CALL in vocabulary learning

description: In recent years, the importance of English language students developing their vocabulary knowledge has become to be recognized. Computers and Internet have been incorporated in education and in language teaching for more than a decade; therefore it is considered important to investigate their role in vocabulary acquisition. In the first chapter the importance of technology in language education is underlined presenting tools and ways of presenting and remembering the vocabulary. In chapter two discusses vocabulary teaching and learning in CALL, which is an important field in language education. Finally, a research been conducted on various language teaching and learning websites, will be analyzed and discussed in the light of their usefulness on vocabulary acquisition.
description: Τα τελευταία χρόνια, η σημαντικότητα και η αναγκαιότητα της ανάπτυξης λεξιλογίου στους μαθητές της Αγγλικής Γλώσσας, είναι αναγνωρισμένη. Οι υπολογιστές και το ίντερνετ έχουν ενσωματωθεί στην εκπαίδευση και στη διδασκαλία της γλώσσας περισσότερο από μία δεκαετία. Ο στόχος αυτής της διπλωματικής εργασίας είναι να ερευνήσει το ρόλο αυτών των εργαλίων στην απόκτηση λεξιλογίου. Έτσι, στο πρώτο μέρος και θεωρητικό μέρος της εργασίας καταγράφεται η σημαντικότητα της τεχνολογίας στην εκμάθηση γλώσσας, παρουσιάζοντας συγχρόνως εργαλεία και τρόπους απόκτησης λεξιλογίου. Καταγράφεται, επίσης, ενα σημαντικό πεδιό στην εκπαίδευση της γλώσσας, το οποίο ονομάζεται CALL ( Computer Assisted Language Learning) και αφορά την εκμάθηση της γλώσσας μέσω υπολογιστή. Στο τελευταίο κομμάτι της διπλωματικής υπάρχει η έρευνα που διεξήχθη στο ίντερνετ, αναλύοντας και καταγράφοντας τα χαρακτηριστικά ιστοσελίδων εκμάθησης γλώσσας.
Forces within hadrons on the light front
Creators: name: Freese, Adam
name: Miller, Gerald A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this work, we find the light front densities for momentum and forces, including pressure and shear forces, within hadrons. This is achieved by deriving relativistically correct expressions relating these densities to the gravitational form factors $A(t)$ and $D(t)$ associated with the energy momentum tensor. The derivation begins from the fundamental definition of density in a quantum field theory, namely the expectation value of a local operator within a spatially-localized state. We find that it is necessary to use the light front formalism to define a density that corresponds to internal hadron structure. When using the instant form formalism, it is impossible to remove the spatial extent of the hadron wave function from any density, and -- even within instant form dynamics -- one does not obtain a Breit frame Fourier transform for a properly defined density. Within the front formalism, we derive new expressions for various mechanical properties of hadrons, including the mechanical radius, as well as for stability conditions. The multipole ansatz for the form factors is used as an example to illustrate all of these findings.
description: 2 figures
Constraints on coloured scalars from global fits
Creators: name: Eberhardt, Otto
name: Miralles, Víctor
name: Pich, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a simple extension of the electroweak theory, incorporating one $SU(2)_L$ doublet of colour-octet scalars with Yukawa couplings satisfying the principle of minimal flavour violation. Using the HEPfit package, we perform a global fit to the available data, including all relevant theoretical constraints, and extract the current bounds on the model parameters. Coloured scalars with masses below 1.05 TeV are already excluded, provided they are not fermiophobic. The mass splittings among the different (charged and CP-even and CP-odd neutral) scalars are restricted to be smaller than 20 GeV. Moreover, for scalar masses smaller than 1.5 TeV, the Yukawa coupling of the coloured scalar multiplet to the top quark cannot exceed the one of the SM Higgs doublet by more than 80%. These conclusions are quite generic and apply in more general frameworks (without fine tunings). The theoretical requirements of perturbative unitarity and vacuum stability enforce relevant constraints on the quartic scalar potential parameters that are not yet experimentally tested.
Solving parallel transport equations in the higher-dimensional Kerr-NUT-(A)dS spacetimes
Creators: name: Connell, Patrick
name: Frolov, Valeri P.
name: Kubiznak, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We obtain and study the equations describing the parallel transport of orthonormal frames along geodesics in a spacetime admitting a non-degenerate principal conformal Killing-Yano tensor h. We demonstrate that the operator F, obtained by a projection of h to a subspace orthogonal to the velocity, has in a generic case eigenspaces of dimension not greater than 2. Each of these eigenspaces are independently parallel-propagated. This allows one to reduce the parallel transport equations to a set of the first order ordinary differential equations for the angles of rotation in the 2D eigenspaces. General analysis is illustrated by studying the equations of the parallel transport in the Kerr-NUT-(A)dS metrics. Examples of three, four, and five dimensional Kerr-NUT-(A)dS are considered and it is shown that the obtained first order equations can be solved by a separation of variables.
description: 14 pages, no figures
Averaging Generalized Scalar Field Cosmologies I: Locally Rotationally Symmetric Bianchi III and open Friedmann-Lemaître-Robertson-Walker models
Creators: name: Leon, Genly
name: González, Esteban
name: Lepe, Samuel
name: Michea, Claudio
name: Millano, Alfredo D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Scalar field cosmologies with a generalized harmonic potential and a matter fluid with a barotropic Equation of State (EoS) with barotropic index $γ$ for Locally Rotationally Symmetric (LRS) Bianchi III metric and open Friedmann-Lemaître-Robertson-Walker (FLRW) metric are investigated. Methods from the theory of averaging of nonlinear dynamical systems are used to prove that time-dependent systems and their corresponding time-averaged versions have the same late-time dynamics. Therefore, simple time-averaged systems determine the future asymptotic behavior. Depending on values of barotropic index $γ$ late-time attractors of physical interests for LRS Bianchi III metric are Bianchi III flat spacetime, matter dominated FLRW universe (mimicking de Sitter, quintessence or zero acceleration solutions) and matter-curvature scaling solution. For open FLRW metric late-time attractors are a matter dominated FLRW universe and Milne solution. With this approach, oscillations entering nonlinear system through Klein-Gordon (KG) equation can be controlled and smoothed out as the Hubble factor $H$ - acting as a time-dependent perturbation parameter - tends monotonically to zero. Numerical simulations are presented as evidence of such behaviour.
description: Research Program Averaging Generalized Scalar Field Cosmologies, part I. 48 pages, 24 compound figures. Minor revision. References added
Effects of food addition on a population of grey jays
Creators: name: Delehanty, Brendan
Publisher: name: University of British Columbia
Year: 2009

description: Grey jays (Perisoreus canadensis). in the southwest Yukon were provided with supplemental food on three study areas to study the effects of food on territoriality and foraging strategies. Territory sizes and overlap were measured in 1993 and 1994. Territories of food addition grids were 3 0% smaller than those on grids without access to added food. There was only slightly more overlap between territories on food addition grids compared to controls, and the difference was not statistically significant. Time spent foraging, the rate at which jays made caches, and the weights of jays were measured. These data were used to test four hypotheses about the factors that limit overwinter body masses of jays. Birds on food addition grids made three times as many caches as control birds in a similar amount of time spent foraging. In winter, grey jays with added food spent less time foraging, yet they were able to maintain higher body condition than control birds. These results were consistent with the hypothesis that overwinter weights are limited by both a food shortage and by costs associated with increasing weight. Seasonal trends in body condition differed between birds on food addition grids and those without supplemental food. Birds with added food were in better condition year round, and were able to increase in weight between summer and fall. Control birds lost weight between summer and fall, but then increased dramatically in winter. These different weight trends may represent different caching or cache retrieval strategies.
First hitting time and place, monopoles and multipoles for pseudo-processes driven by the equation $\partial/\partial t = \pm\partial^N/\partial x^N$
Creators: name: Lachal, Aimé
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G20, 60J25

description: Consider the high-order heat-type equation $\partial u/\partial t=\pm\partial^N u/\partial x^N$ for an integer $N>2$ and introduce the related Markov pseudo-process $(X(t))_{t\ge 0}$. In this paper, we study several functionals related to $(X(t))_{t\ge 0}$: the maximum $M(t)$ and minimum $m(t)$ up to time $t$; the hitting times $τ_a^+$ and $τ_a^-$ of the half lines $(a,+\infty)$ and $(-\infty,a)$ respectively. We provide explicit expressions for the distributions of the vectors $(X(t),M(t))$ and $(X(t),m(t))$, as well as those of the vectors $(τ_a^+,X(τ_a^+))$ and $(τ_a^-,X(τ_a^-))$.
description: 51 pages
Social stress drives the multi-wave dynamics of COVID-19 outbreaks
Creators: name: Kastalskiy, I. A.
name: Pankratova, E. V.
name: Mirkes, E. M.
name: Kazantsev, V. B.
name: Gorban, A. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The dynamics of epidemics depend on how people's behavior changes during an outbreak. At the beginning of the epidemic, people do not know about the virus, then, after the outbreak of epidemics and alarm, they begin to comply with the restrictions and the spreading of epidemics may decline. Over time, some people get tired/frustrated by the restrictions and stop following them (exhaustion), especially if the number of new cases drops down. After resting for a while, they can follow the restrictions again. But during this pause the second wave can come and become even stronger then the first one. Studies based on SIR models do not predict the observed quick exit from the first wave of epidemics. Social dynamics should be considered. The appearance of the second wave also depends on social factors. Many generalizations of the SIR model have been developed that take into account the weakening of immunity over time, the evolution of the virus, vaccination and other medical and biological details. However, these more sophisticated models do not explain the apparent differences in outbreak profiles between countries with different intrinsic socio-cultural features. In our work, a system of models of the COVID-19 pandemic is proposed, combining the dynamics of social stress with classical epidemic models. Social stress is described by the tools of sociophysics. The combination of a dynamic SIR-type model with the classical triad of stages of the general adaptation syndrome, alarm-resistance-exhaustion, makes it possible to describe with high accuracy the available statistical data for 13 countries. The sets of kinetic constants corresponding to optimal fit of model to data were found. They characterize the ability of society to mobilize efforts against epidemics and maintain this concentration over time, and can further help in the development of strategies specific to a particular society.
description: Minor corrections, enriched discussion and extended bibliography
Maximum mass of compact stars from gravitational wave events with finite-temperature equations of state
Creators: name: Khadkikar, Sanika
name: Raduta, Adriana R.
name: Oertel, Micaela
name: Sedrakian, Armen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We conjecture and verify a set of universal relations between global parameters of hot and fast-rotating compact stars, including a relation connecting the masses of the mass-shedding (Kepler) and static configurations. We apply these relations to the GW170817 event by adopting the scenario in which a hypermassive compact star remnant formed in a merger evolves into a supramassive compact star that collapses into a black hole once the stability line for such stars is crossed. We deduce an upper limit on the maximum mass of static, cold neutron stars $ 2.15^{+0.10}_{-0.07}\le M^\star_{\mathrm{TOV}} \le 2.24^{+0.12}_{-0.10} $ for the typical range of entropy per baryon $2 \le S/A \le 3$ and electron fraction $Y_e = 0.1$ characterizing the hot hypermassive star. Our result implies that accounting for the finite temperature of the merger remnant relaxes previously derived constraints on the value of the maximum mass of a cold, static compact star.
description: 17 pages, 11 figures
Lorentz Violating Inflation
Creators: name: Kanno, Sugumi
name: Soda, Jiro
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore the impact of Lorentz violation on the inflationary scenario. More precisely, we study the inflationary scenario in the scalar-vector-tensor theory where the vector is constrained to be unit and time like. It turns out that the Lorentz violating vector affects the dynamics of the chaotic inflationary model and divides the inflationary stage into two parts; the Lorentz violating stage and the standard slow roll stage. We show that the universe is expanding as an exact de Sitter spacetime in the Lorentz violating stage although the inflaton field is rolling down the potential. Much more interestingly, we find exact Lorentz violating inflationary solutions in the absence of the inflaton potential. In this case, the inflation is completely associated with the Lorentz violation. We also mention some consequences of Lorentz violating inflation which can be tested by observations.
description: 7 pages, 1 figure
Constraints on spinning dust towards Galactic targets with the VSA: a tentative detection of excess microwave emission towards 3C396
Creators: name: Scaife, Anna
name: Green, David A.
name: Battye, Richard A.
name: Davies, Rod D.
name: Davis, Richard J.
name: Dickinson, Clive
name: Franzen, Thomas
name: Genova-Santos, Ricardo
name: Grainge, Keith
name: Hafez, Yaser A.
name: Hobson, Michael P.
name: Lasenby, Anthony
name: Pooley, Guy G.
name: Rajguru, Nutan
name: Rebolo, Rafael
name: Rubino-Martin, Jose Alberto
name: Saunders, Richard D. E.
name: Scott, Paul F.
name: Titterington, David
name: Waldram, Elizabeth
name: Watson, Robert A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present results from observations made at 33 GHz with the Very Small Array (VSA) telescope towards potential candidates in the Galactic plane for spinning dust emission. In the cases of the diffuse HII regions LPH96 and NRAO591 we find no evidence for anomalous emission and, in combination with Effelsberg data at 1.4 and 2.7 GHz, confirm that their spectra are consistent with optically thin free--free emission. In the case of the infra-red bright SNR 3C396 we find emission inconsistent with a purely non-thermal spectrum and discuss the possibility of this excess arising from either a spinning dust component or a shallow spectrum PWN, although we conclude that the second case is unlikely given the strong constraints available from lower frequency radio images.
description: 5 pages, 5 figure, accepted for publication MNRAS
Causality and gravity
Creators: name: Donoghue, John F.
name: Menezes, Gabriel
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show how uncertainty in the causal structure of field theory is essentially inevitable when one includes quantum gravity. This includes the fact that lightcones are ill-defined in such a theory. This effect is small in the effective field theory regime, where it it independent of the UV completion of the theory, but grows with energy and represents an unknown uncertainty for a generic UV completion. We include details of the causality uncertainty which arises in a particular UV completion, i.e. quadratic gravity. We describe how the mechanisms uncovered in the effective field theory treatment, and some of those in quadratic gravity, could be common features of quantum gravity.
description: 15 pages, 3 figures, revised version as accepted by JHEP
QCD sum rules for rho mesons in vacuum and in-medium, re-examined
Creators: name: Kwon, Youngshin
name: Procura, Massimiliano
name: Weise, Wolfram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An updated investigation of QCD sum rules for the first two moments of rho meson spectral functions, both in vacuum and in-medium, is performed with emphasis on the role of the scale related to spontaneous chiral symmetry breaking in QCD. It is demonstrated that these lowest moments of vector current spectral distributions do permit an accurate sum rule analysis with controlled input including QCD condensates of the lowest dimensions, whereas higher moments are subject to uncertainties from higher dimensional condensates. Possible connections with Brown-Rho scaling are discussed. The factorization approximation for four-quark condensates is shown not to be applicable in any of the cases studied.
description: 11 pages, 8 figures, the revised version to appear in Phys. Rev. C
Σύνθεση αζα-σακχάρων με δομή πυρρολιδίνης και πυρρολιζιδίνης
Creators: name: Ιορδανίδης, Νικόλαος Σάββα
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: subject: Οργανική Χημεία
subject: Σύνθεση
subject: Αζα-σάκχαρα
subject: Organic Chemistry
subject: FOS: Chemical sciences
subject: Synthesis
subject: Aza-sugars

description: Ελληνική Περίληψη Σκοπός της μεταπτυχιακής εργασίας ήταν η σύνθεση αζασακχάρων με δομή πυρρολιδίνης και πυρρολιζιδίνης. Η παρούσα μεταπτυχιακή εργασία χωρίζεται σε τρεις ενότητες. Στην πρώτη ενότητα γίνεται σύνθεση ενός αζασακχάρου πυρρολιζιδίνης με εφαρμογή της αντίδρασης έτερο-Diels-Alder. Αυτού του είδους η αντίδραση γίνεται ενδομοριακά, από μία νιτρώζο-ένωση, που συντέθηκε από το σάκχαρο L-αραβινόζη. Στη δεύτερη ενότητα γίνεται η σύνθεση ενός αζασακχάρου πυρρολιδίνης από το σάκχαρο D-ριβόζη. Τα αζασάκχαρα αποτελούν ενώσεις που έχουν φαρμακευτική δράση και για αυτό η σύνθεσή τους έχει μεγάλη ζήτηση. Στην τρίτη ενότητα γίνεται προσπάθεια τροποποίησης του αντιβιοτικού πεντανομυκίνη, προς τη σύνθεση αζασακχάρων δυστυχώς χωρίς επιτυχή αποτελέσματα.
description: The aim of the postgraduate thesis was the synthesis of azasugars with a structure of pyrrolidine and pyrrolizidine. This postgraduate thesis is divided into three modules. In the first section a synthesis of a pyrazolizidine azasugar is carried out by applying the hetero-Diels-Alder reaction. This kind of reaction is done intramolecularly by a nitroso compound synthesized by the L-arabinose sugar. In the second section, synthesis of an azasugar of pyrrolidine from D-ribose sugar is made. Azasugars are compounds that have a pharmaceutical effect and therefore their composition is highly desirable. The third section attempts to modify the antibiotic pentanomycin, to the synthesis of azasugars unfortunately without successful results.
Stellar kinematics and metallicities in the Leo I dwarf spheroidal galaxy -- wide field implications for galactic evolution
Creators: name: Koch, A.
name: Wilkinson, M. I.
name: Kleyna, J. T.
name: Gilmore, G. F.
name: Grebel, E. K.
name: Mackey, A. D.
name: Evans, N. W.
name: Wyse, R. F. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present low-resolution spectroscopy of 120 red giants in the Galactic satellite dwarf spheroidal (dSph) Leo I, obtained with the GeminiN-GMOS and Keck-DEIMOS spectrographs. We find stars with velocities consistent with membership of Leo I out to 1.3 King tidal radii. By measuring accurate radial velocities with a median measurement error of 4.6 km/s we find a mean systemic velocity of 284.2 km/s with a global velocity dispersion of 9.9 km/s. The dispersion profile is consistent with being flat out to the last data point. We show that a marginally-significant rise in the radial dispersion profile at a radius of 3' is not associated with any real localized kinematical substructure. Given its large distance from the Galaxy, tides are not likely to have affected the velocity dispersion, a statement we support from a quantitative kinematical analysis, as we observationally reject the occurrence of a significant apparent rotational signal or an asymmetric velocity distribution. Mass determinations adopting both isotropic stellar velocity dispersions and more general models yield a M/L ratio of 24, which is consistent with the presence of a significant dark halo with a mass of about 3x10^7 M_sun, in which the luminous component is embedded. This suggests that Leo I exhibits dark matter properties similar to those of other dSphs in the Local Group. Our data allowed us also to determine metallicities for 58 of the targets. We find a mildly metal poor mean of -1.31 dex and a full spread covering 1 dex. In contrast to the majority of dSphs, Leo I appears to show no radial gradient in its metallicities, which points to a negligible role of external influences in this galaxy's evolution.
description: 29 pages, 14 Figures, accepted for publication in the ApJ
Trinucleon form factors with relativistic multirankseparable kernels
Creators: name: Bondarenko, Serge
name: Burov, Valery
name: Yurev, Sergey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This paper studies elastic electron-trinucleon scattering in the relativistic impulse approximation. The amplitudes for a trinucleon have been obtainedby solving the relativistic generalization of the Faddeev equations with amultirank separable kernel of the nucleon-nucleon interactions. The staticapproximation and additional relativistic corrections for the trinucleon electromagnetic form factors have been calculated for the momentum transfersquared up to 50 fm^-2
ความรู้ความสามารถของครอบครัวในการดูแลผู้สูงอายุหลังผ่าตัดต้อกระจก
Creators: name: จิรัชยา  เจียวก๊ก
name: สุภาวี  หมัดอะด้ำ
name: เขมริฐศา  เข็มมะลวน
Publisher: name: มหาวิทยาลัยหาดใหญ่
Year: 2558
Subjects: ความรู้ ความสามารถของครอบครัว , การดูแล , ผู้สูงอายุหลังผ่าตัดต้อกระจก

description: 1, 13, วารสารหาดใหญ่วิชาการ
Molecular oxygen in the rho Ophiuchi cloud
Creators: name: Larsson, B.
name: Liseau, R.
name: Pagani, L.
name: Bergman, P.
name: Bernath, P.
name: Biver, N.
name: Black, J. H.
name: Booth, R. S.
name: Buat, V.
name: Crovisier, J.
name: Curry, C. L.
name: Dahlgren, M.
name: Encrenaz, P. J.
name: Falgarone, E.
name: Feldman, P. A.
name: Fich, M.
name: Flore'n, H. G.
name: Fredrixon, M.
name: Frisk, U.
name: Gahm, G. F.
name: Gerin, M.
name: Hagstroem, M.
name: Harju, J.
name: Hasegawa, T.
name: Hjalmarson, Aa.
name: Horellou, C.
name: Johansson, L. E. B.
name: Justtanont, K.
name: Klotz, A.
name: Kyroelae, E.
name: Kwok, S.
name: Lecacheux, A.
name: Liljestroem, T.
name: Llewellyn, E. J.
name: Lundin, S.
name: Me'gie, G.
name: Mitchell, G. F.
name: Murtagh, D.
name: Nordh, L. H.
name: Nyman, L. -Aa.
name: Olberg, M.
name: Olofsson, A. O. H.
name: Olofsson, G.
name: Olofsson, H.
name: Persson, G.
name: Plume, R.
name: Rickman, H.
name: Ristorcelli, I.
name: Rydbeck, G.
name: Sandqvist, Aa.
name: Sche'ele, F. v.
name: Serra, G.
name: Torchinsky, S.
name: Tothill, N. F.
name: Volk, K.
name: Wiklind, T.
name: Wilson, C. D.
name: Winnberg, A.
name: Witt, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Molecular oxygen, O2 has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O2 emission. The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. The Odin satellite carries a 1.1 m sub-millimeter dish and a dedicated 119 GHz receiver for the ground state line of O2. Starting in 2002, the star forming molecular cloud core rho Oph A was observed with Odin for 34 days during several observing runs. We detect a spectral line at v(LSR) = 3.5 km/s with dv(FWHM) = 1.5 km/s, parameters which are also common to other species associated with rho Ohp A. This feature is identified as the O2 (N_J = 1_1 - 1_0) transition at 118 750.343 MHz. The abundance of molecular oxygen, relative to H2,, is 5E-8 averaged over the Odin beam. This abundance is consistently lower than previously reported upper limits.
description: 10 pages, 11 figures, accepted for publication in A&A
องค์ประกอบคุณภาพชีวิตในการทำงานของพนักงานขับรถสองแถวโดยสารประจำทางในจังหวัดสมุทรสาคร
Creators: name: ชลภัสสรณ์  สิทธิวรงค์ชัย
name: ประสพชัย  พสุนนท์
Publisher: name: มหาวิทยาลัยหาดใหญ่
Year: 2558
Subjects: องค์ประกอบของคุณภาพชีวิต , คุณภาพชีวิต , พนักงานขับรถสองแถวโดยสารประจำทาง

description: 1, 13, วารสารหาดใหญ่วิชาการ
Covariant formulation of non-equilibrium thermodynamics in General Relativity
Creators: name: Espinosa-Portales, Llorenc
name: Garcia-Bellido, Juan
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We construct a generally-covariant formulation of non-equilibrium thermodynamics in General Relativity. We find covariant entropic forces arising from gradients of the entropy density, and a corresponding non-conservation of the energy momentum tensor in terms of these forces. We also provide a Hamiltonian formulation of General Relativity in the context of non-equilibrium phenomena and write the Raychaudhuri equations for a congruence of geodesics. We find that a fluid satisfying the strong energy condition could avoid collapse for a positive and sufficiently large entropic-force contribution. We then study the forces arising from gradients of the bulk entropy of hydrodynamical matter, as well as the entropy of boundary terms in the action, like those of black hole horizons. Finally, we apply the covariant formulation of non-equilibrium thermodynamics to the expanding universe and obtain the modified Friedmann equations, with an extra term corresponding to an entropic force satisfying the second law of thermodynamics.
description: 14 pages. Comments and references added. New section dealing with real fluids added. Matches accepted version by PDU
Phase-dependent noise correlations in normal-superconducting structures
Creators: name: Stenberg, Markku P. V.
name: Virtanen, Pauli
name: Heikkilä, Tero T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study nonequilibrium noise correlations in diffusive normal-superconducting structures in the presence of a supercurrent. We present a parametrization for the quasiclassical Green's function in the first order of the counting field $χ$. This we employ to obtain the voltage and phase dependence of cross and autocorrelations and to describe the role played by the setup geometry. We find that the low-voltage behavior of the effective charge $q_{\rm eff}$ describing shot noise is a result of a competition between anticorrelation of Andreev pairs due to proximity effect and the depression of the local density of states. Furthermore, we show that the noise correlations are independent of the sign of the supercurrent.
description: 5 pages, 5 figures
Highly uniform GaSb quantum dots with indirect-direct bandgap crossover at telecom range
Creators: name: Chellu, Abhiroop
name: Hilska, Joonas
name: Penttinen, Jussi-Pekka
name: Hakkarainen, Teemu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate a new quantum-confined semiconductor material based on GaSb quantum dots (QDs) embedded in single-crystalline AlGaSb matrix by filling droplet-etched nanoholes. The droplet-mediated growth mechanism allows formation of low QD densities required for non-classical single-QD light sources. The photoluminescence (PL) experiments reveal that the GaSb QDs have an indirect-direct bandgap crossover at telecom wavelengths. This is due to the alignment of the Γ and L valleys in the conduction band as a result of quantum confinement controlled by dimensions of the nanostructure. We show that in the direct bandgap regime close to 1.5 um wavelength, the GaSb QDs have a type I band alignment and exhibit excitonic emission with narrow spectral lines and very low inhomogeneous broadening of PL emission owing to the high material quality and dimensional uniformity. These properties are extremely promising in terms of applications in infrared quantum optics and quantum photonic integration.
description: 12 pages, 4 figures
Μουσική και Δημιουργική Γραφή: Αξιοποίηση της Μουσικής σε πρακτικές Δημιουργικής Γραφής στην Πρωτοβάθμια Εκπαίδευση
Creators: name: Κωνσταντίνου, Αλίκη Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Μουσική
Δημιουργική Γραφή
Πρωτοβάθμια Εκπαίδευση
Music
Creative Writing
Primary Education

description: Η εργασία αποτελεί μια Έρευνα-Δράση που έχει ως σκοπό να εξετάσει αν η μουσική μπορεί να αποτελέσει ένα ισχυρό εργαλείο και ένα πλούσιο πεδίο ερεθισμάτων για δράσεις Δημιουργικής Γραφής. Η παρούσα εργασία παρουσιάζει μια εκπαιδευτική παρέμβαση που πραγματοποιήθηκε στη Ε΄ τάξη του 1ου Δημοτικού Σχολείου Πλαγιαρίου, στο πλαίσιο του πτυχιακής εργασίας του Προγράμματος Μεταπτυχιακών Σπουδών «Επιστήμες της Αγωγής – Δημιουργική γραφή και εκδοτική παραγωγή για το παιδί: από το σχολικό στο εξωσχολικό βιβλίο». Οι μαθητές/τριες ήρθαν σε επαφή με διάφορα είδη μουσικής και χρησιμοποίησαν τα χαρακτηριστικά της μουσικής αυτής κατά τη συγγραφή πεζού ή ποιητικού λόγου. Τα επιλεγμένα μουσικά κομμάτια κατέφεραν να ενεργοποιήσουν τους/τις μαθητές/τριες, και τους/τις ώθησαν να εκφραστούν γλωσσικά. Τα παιδιά υιοθέτησαν τεχνικά, μορφολογικά και υφολογικά στοιχεία της μουσικής μέσα στα κείμενά τους. Στην εργασία περιγράφονται όλες οι δράσεις και αναλύονται όλα τα παραγόμενα κείμενα των παιδιών μέσα από τεχνικές αφηγηματολογίας, καθώς και με κριτήρια του τεστ δημιουργικότητας Torrance. Ακόμα, εξετάζεται η συμμετοχή των παιδιών στη διαδικασία, καθώς και οι δυσκολίες που αντιμετωπίστηκαν στην πράξη. Τέλος, προτείνονται πιθανές προεκτάσεις και ιδέες για διδασκαλία μέσα στη σχολική τάξη και για δράσεις Δημιουργικής Γραφής.
description: This work is an Action-Research project that aims to examine whether music can be a powerful tool and a rich field for stimulating Creative Writing activities. This paper presents an educational intervention that took place in the 5th grade of the 1st Primary School of Plagiari, for the postgraduate studies "Sciences of Education - Creative Writing and Publishing for the Child: From the School to the Extracurricular Book". The students came into contact with different types of music and used the characteristics of the music when writing a prose or a poem. The selected music tracks managed to activate the students, who where prompted to express themselves with words. The children incorporated technical, morphological and stylistic characteristics inside their texts. The work describes all the activities and analyzes all the produced texts of the children through narrative techniques, as well as through the criteria of Torrance creativity test. It also examines the involvement of children in the process, as well as the difficulties encountered in practice. Finally, we suggest possible extensions and ideas for teaching in the class and for Creative Writing activities.