cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate
Creators: name: Williamson, Lewis A.
name: Blakie, P. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Ferromagnetic spin-1 Bose-Einstein condensates in the broken-axisymmetric phase support polar-core spin vortices (PCVs), which are intimately linked to the nonequilibrium dynamics of the system. For a purely transversely magnetized system, the Turner point-vortex model predicts that PCVs behave like massive charged particles interacting via a two-dimensional Coulomb potential. We test the accuracy of the Turner model for two oppositely charged PCVs, via comparisons with numerical simulations. While the bare Turner model shows discrepancies with our numerical results, we find that a simple rescaling of the PCV mass gives much better agreement. This can be explained via a phenomenological damping arising from coupling to modes extrinsic to the point-vortex phase space. We also identify the excitations produced following PCV annihilation, which help elucidate recent phase ordering results. We extend the Turner model to cases where the system is magnetized both transversally and axially, identifying a crossover to scalar vortex dynamics for increasing external Zeeman field.
description: 12 pages, 7 figures
Determination of Organochlorine Pesticide and Polychlorinated Biphenyl as POPs Residues in Freshwater Animals in Thailand during 2017-2018
Creators: name: Weerawut Wittayanan
Publisher: name: กองบริหารการวิจัย
Year: 2019
Subjects: Freshwater animal, GC-ECD, Organochlorine pesticide, PCB, QuEChERS

description: Science & Technology Asia, 24, 3, 27-38
Εκλεκτικός προσδιορισμός κυανιούχων ιόντων με την τεχνική της αυτόματης διαδοχικής έγχυσης σε συνεχή ροή διάχυσης αερίων και της εν σειρά προσθήκης προτύπου:
Creators: name: Καραστογιάννη, Σοφία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Κυανιούχα
Προσδιορισμός
Διάχυση αερίων
Διαδοχική έγχυση
Φασματοφωτομετρία
Νινυδρίνη
Cyanide
Determination
Sequential injection
Spectrophotometry
Gas-diffusion
Ninhydrin

description: Σκοπός της εργασίας ήταν ο αυτόματος φασματοφωτομετρικός προσδιορισμός του ιό-ντος CN- σε δείγματα πόσιμου και εμφιαλωμένου νερού, με την τεχνική SI – GD. Ο προσδιορισμός βασίζεται στην αντίδραση της νινυδρίνης με το ιόν CN- σε αλκαλικό διάλυμα Na2CO3 και το φασματοφωτομετρικό προσδιορισμό του προκύπτοντος έγχρω-μου προϊόντος στα 510 nm. Η εκλεκτικότητα της μεθόδου αυξήθηκε σημαντικά με την εν σειρά προσθήκη στο εξεταζόμενο σύστημα της τεχνικής της διάχυσης των αερίων. Μελετήθηκαν οι χημικές και οργανολογικές παράμετροι που επιδρούν στο σύστημα, καθώς επίσης ελέγχθηκε η αξιοπιστία της προτεινόμενης μεθόδου σε σχέση με τη γραμμικότητα (7,5 - 200 μg L-1 CN-), το όριο ανίχνευσης (2,5 μg L-1 CN-) και ποσοτι-κού προσδιορισμού (7,5 μg L-1 CN-), την επαναληψιμότητα και την εκλεκτικότητα. Η προτεινόμενη μέθοδος εφαρμόστηκε με επιτυχία στην ανάλυση δειγμάτων πόσιμου και εμφιαλωμένου νερού και η ακρίβειά της εκφράστηκε με πειράματα ανάκτησης μεταξύ 94,2 % και 103,6 %.
description: A highly selective sequential injection (SI) method for the automated determina-tion of weak-aciddissociable cyanides is reported. The analytical procedure is based on the on-line reaction of the analyte with ninhydrin in carbonate medium to form a col-oured product (λmax = 510 nm). Cyanides are removed from sample matrix by acidifica-tion through a gas-diffusion step incorporated in the SI manifold. The effect of instru-mental and chemical variables was studied. By adopting an on-line standard addition protocol, the sensitivity of the proposed method was enhanced drastically, without af-fecting the determination range. The assay was validated in terms of linearity (up to 200 g L−1), limit of detection (cL = 2.5 g L−1), limit of quantitation (cQ =7.5 g L−1), precision (sr < 2.5 % at 100 g L−1) and selectivity. High tolerance against critical species such as sulfides and thiocyanates was achieved. The applicability of the method was demonstrated by analyzing tap and mineral water samples at levels below the limits established by international E. U. and U. S. organizations. The percent recoveries were satisfactory in all cases, ranging between 94.2 % and 103.6 %.
Προσομοίωση αντίδρασης -διάχυσης δύο ειδών σωματιδίων σε πλέγμα δύο διαστάσεων:
Creators: name: Μπολέτη, Ειρήνη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Προσομοίωση
Τυχαίος περίπατος
Διάχυση
Αντίδραση δύο ειδών στοιχείων
Εξαΰλωση
Προγραμματισμός
Simulation
Random walk
Diffusion
Two particles reaction
Annihilation
Computer programming

description: Στην εργασία μας μελετήσαμε υπολογιστικά μοντέλα αντίδρασης διάχυσης σε δισδιάστατα πλέγματα. Η αντίδραση που προσομοιώσαμε είναι συγκεκριμένα η αντίδραση εξαύλωσης δύο ειδών σωματιδίων A + B →0 . Για να πραγματοποιήσουμε αυτή την μελέτη κατασκευάσαμε πρόγραμμα ηλεκτρονικού υπολογιστή χρησιμοποιώντας τις γλώσσες προγραμματισμού C++ και Mathematica. Πραγματοποιήθηκε μεγάλος αριθμός επαναλήψεων του μοντέλου ώστε να εξασφαλίσουμε την ακρίβεια των αποτελεσμάτων μας, για πλέγματα διαφόρων μεγεθών και τιμών συγκεντρώσεων των σωματιδίων. μεγαλύτερη ακρίβεια πραγματοποιήσαμε μεγάλο αριθμό επαναλήψεων. Τα αποτελέσματα μας δείχνουν ότι ο νόμος που περιγράφει την μεταβολή της συγκέντρωσης των αντιδρώντων στοιχείων είναι της μορφής 0 1 1 a t c c    −    ı . Ο εκθέτης α υπολογίστηκε για την περίπτωση των δύο διαστάσεων ίσος με 0.56. Η πειραματική τιμή που υπολογίσαμε από τις προσομοιώσεις μας είναι αρκετά κοντά στην θεωρητικά αναμενόμενη τιμή α=0.5. Σύμφωνα με τα αποτελέσματα των προσομοιώσεων μας καταλήγουμε στο συμπέρασμα ότι ο εκθέτης α είναι ανεξάρτητος από το μέγεθος του πλέγματος που χρησιμοποιούμε. Εξαρτάται όμως από την διάσταση του συστήματος. Για παράδειγμα για μονοδιάστατο πλέγμα η θεωρητικά αναμενόμενη τιμή του είναι 0.25, ενώ η προσομοίωση μας έδωσε 0.31. Παρατηρήσαμε επίσης και επιβεβαιώσαμε το φαινόμενο του χωρικού διαχωρισμού των ομοειδών σωματιδίων (segregation).
description: In this work we study the diffusion - reaction of two kinds of particles using computer models applied in a 2D grid. The annihilation reaction is described by A + B →0 . In our study we create a computer program using C++ and Mathematica. We repeated our simulation for many different initial conditions, which means that we produced results for different lattice sizes and different concentrations. The results show that the law which describes the reduction of the concentration of reactors is represented by 0 1 1 a t c c    −    ı . The exponent a is calculated to be 0.56, which is close to the theoretical value of 0.5. We concluded that the exponent a is unaffected by the size of the grid, but it depends on the dimension of the system. For the 1D grid we calculated the value of the exponent a equal to 0.31, while the theoretical value is 0.25. We also confirmed the segregation of the particles, a phenomenon that is predicted by the theory.
Strangeness enhancement at LHC
Creators: name: Rafelski, Johann
name: Letessier, Jean
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study production of strangeness in the hot QGP fireball in conditions achieved at LHC, and use these results to obtain soft (strange) hadron multiplicities. We compare the chemical equilibrium and non-equilibrium conditions and identify characteristic experimental observables.
description: Presented at SQM07, to appear in JPG special issue. One table with predictions
Investigation of Mixing Characteristics in Strut Injectors using Modal Decomposition
Creators: name: Soni, Rahul Kumar
name: De, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Effect of large-scale vortical structure on mixing and spreading of shear layer is numerically investigated. Two strut configurations namely Straight & Tapered strut at two convective Mach numbers (Mc = 1.4 & 0.37) for two jet heights (0.6 & 1mm) are investigated. Hydrogen jet is injected through a two-dimensional slot in oncoming coflow at Mach 2. Excellent agreement between simulated and experimental data is witnessed, whereas the instantaneous data reveal the presence of various large-scale structures in the flow field. From the instantaneous field, it becomes apparent that both the geometries have different vortical breakdown locations. It is also noticed that an early onset of vortex breakdown manifests itself into the mixing layer thickness enhancement, effect of which is reflected in overall mixing characteristics. It becomes evident that the shear strength plays an important role in the near field mixing. The higher shear strength promotes the generation of large vortices. The analysis shows that SS-0.6 case offers highest mixing efficiency being dominated by relatively large-scale structures. Eigenmodes obtained through Proper Orthogonal Decomposition (POD) confirm the presence of dominating structures and shed light into the series of events involved in vortex pairing/merging and breakdown. Dynamic modal decomposition (DMD) also strengthens the observation made through the POD.
Ηλεκτρονικά συστήματα διαχείρισης και μάρκετινγκ τουριστικών προορισμών:
Creators: name: Γκαλαϊτση, Ευαγγελία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Τουριστικός προορισμός
Οργανισμός διοίκησης προορισμού
Συστήματα διοίκησης προορισμού
Αξιολόγηση τουριστικών ιστοχώρων
Tourism destination
Destination management organisation-DMO
Destination Management system-DMS
Evaluation of tourism websites

description: Η παρούσα διπλωματική εργασία έχει ως θέμα τα ηλεκτρονικά συστήματα με τη βοήθεια των οποίων οι αρμόδιοι φορείς ενός προορισμού διοικούν και ασκούν το μάρκετινγκ ενός τουριστικού προορισμού. Στόχος της είναι να καταγραφούν τα βασικά χαρακτηριστικά αυτών των συστημάτων καθώς και οι εξελίξεις και οι τάσεις που υπάρχουν σε αυτό το πεδίο έρευνας. Αρχικά περιγράφονται οι οργανισμοί διοίκησης προορισμού ΟΔΠ που είναι υπεύθυνοι για την ανάπτυξη αυτών των συστημάτων. Στη συνέχεια αναλύονται οι υπηρείες που προσφέρουν τα συστήματα τόσο στους τουρίστες όσο και στους ΟΔΠ, τα πλεονεκτήματα τους και οι παράγοντες που είναι κρίσιμοι όσον αφορά την επιτυχία τους. Τέλος αξιολογούνται τα ηλεκτρονικά Συστήματα Διαχείρισης και Μάρκετινγκ των ευρωπαϊκών Μεσογειακών χωρών σε εθνικό επίπεδο με στόχο να εξαχθούν συμπεράσματα και να προταθούν βελτιώσεις για το ελληνικό σύστημα σε σχέση με τους άμεσους ανταγωνιστές του.
description: The theme of this thesis is the electronic systems with which the tourism destinations are being managed and marketed. The goal of the thesis is to commit to paper the basic characteristics of these systems as well as the developments and trend in this field of research. Initially, the destination management organisations- DMOS are analysed as they are responsible for the development of these systems. Also, the services that the systems offer to the tourists and to the DMOs are analysed as well as the advantages and the factors that are crucial to the success of these systems. Finally, the Destination Management Systems- DMSs of the European Mediterranean countries are evaluated and compared at a national level.
Η ακολουθία Fibonacci. Ορισμός-ταυτότητες-διαταραχή-εφαρμογές:
Creators: name: Γραμματικόπουλος, Δημήτριος Σπυρίδωνος
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Ακολουθία Fibonacci
Τύπος του Binet
Naim-Krapivsky disorder διαταραχή
Σταθερές Viswanath
Σταθερές Embree-Trefethen
Χρυσά ορθογώνια
Cassini ταυτότητα
Λόγοι χρυσής τομής

description: Στην παρούσα διπλωματική εργασία γίνεται λόγος για την προσωπικότητα του Leonardo Fibonacci και την προσφορά του στην επιστήμη των μαθηματικών. Μελετάται η δημιουργία της ακολουθίας Fibonacci, το πως προκύπτει ο αναδρομικός και γενικός της τύπος, καθώς επίσης και τι ρόλο παίζει στην επίλυση διαφόρων προβλημάτων. Αποδεικνύονται, επίσης, αρκετές ταυτότητες Fibonacci με διάφορους κλασικούς και ευρηματικούς τρόπους. Παράλληλα, συνδέεται η ακολουθία Fibonacci με γνωστά θεωρήματα και σταθερές των μαθηματικών, ακόμα και της φυσικής. Μελετώνται κάποιες συγκεκριμένες διαταραχές της ακολουθίας Fibonacci χρησιμοποιώντας αυστηρά μαθηματικά και τον υπολογιστή. Τέλος, παρουσιάζονται σημεία του κόσμου μας όπου μπορούμε να συναντήσουμε την ακολουθία αυτή.
description: In this post-graduate project we learn about Leonardo Fibonacci’s personality and about his offer to the mathematics’s science. We study about the Fibonacci numbers’ creation and their recursive and general form. Furthermore, we study how Fibonacci sequence help us to solve a range of problems. We also prove many Fibonacci identities with several classical, or not, ways. In parallel, there is a connection of Fibonacci sequence with some famous corollaries and constants of mathematics’ science and physics as well. We study some specific disorders of Fibonacci sequence by using maths and computer. In the end, we present where we can find Fibonacci sequence in our world.
The E6 inspired isosinglet quark and the Higgs boson
Creators: name: Sultansoy, Saleh
name: Unel, Gokhan
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We consider the experimental implications of the down type isosinglet quark, $D$, predicted by the $E_{6}$, group to Higgs boson searches at the LHC. The pair production of $D$ quarks at the LHC and their subsequent decays $D\to h d$ and $D\to W u$ has been analyzed. For a light Higgs boson of mass O(120 GeV), an analysis based on fast simulation of the ATLAS detector response shows that, the $b\bar{b}$ channel becomes as efficient as the $γγ$ channel for discovering the Higgs particle if $m_{D}<630$ GeV.
description: 9 pages
Particle Dynamics in 3D Self-gravitating Disks I: Spirals
Creators: name: Baehr, Hans
name: Zhu, Zhaohuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Spiral arms are distinctive features of many circumstellar disks, observed in scattered light, which traces the disk surface, millimeter dust emission, which probes the disk midplane, as well as molecular emission. The two leading explanations for spirals are wakes generated by a massive planet and the density waves excited by disk self-gravity. We use stratified 3D hydrodynamic shearing-box simulations including dust particles and disk self-gravity to investigate how gas and dust spirals in a self-gravitating disk depend on the simulation size, the cooling efficiency, and the aerodynamics properties of particles. We find that opening angles of spirals are universal ($\sim10^o$), and not significantly affected by the size of the computational domain, the cooling time, or the particle size. In simulations with the biggest domain, the spirals in the gaseous disk become slightly more open with a higher cooling efficiency. Small dust follows the gaseous spirals very well, while intermediate-sized dust with dimensionless stopping time $(\mathrm{St})$ close to 1 concentrates to the spirals more and shows stronger spirals. However, large dust with $\mathrm{St} > 1$ also shows spirals, which is different from some previous simulations. We identify that this is due to the gravity from the gas to the dust component. We show that when $\mathrm{St} \gtrsim Q$, the gravitational force from the gaseous spirals to the dust particles becomes stronger than the particles' aerodynamic drag force, so that the gas significantly affects these large particles through gravitational interaction. This has important implications for both spiral observations and planetesimal formation/dynamics.
description: 15 pages, 7 figures, Accepted for publication in ApJ
Topological phases in $α$-Li$_{\rm 3}$N-type crystal structure of light-element compounds
Creators: name: Ebrahimian, Ali
name: Asgari, Reza
name: Dadsetani, Mehrdad
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Materials with tunable topological features, simple crystal structure and flexible synthesis, are in extraordinary demand towards technological exploitation of unique properties of topological nodal points. The controlled design of the lattice geometry of light elements is determined by utilizing density functional theory and the effective Hamiltonian model together with the symmetry analysis. This provides an intriguing venue for reasonably achieving various distinct types of novel fermions. We, therefore, show that a nodal line (type-I and II), Dirac fermion, and triple point (TP) fermionic excitation can potentially appear as a direct result of a band inversion in group-I nitrides with $α$-Li$_{\rm 3}$N-type crystal structure. The imposed strain is exclusively significant for these compounds, and it invariably leads to the considerable modification of the nodal line type. Most importantly, a type-II nodal loop can be realized in the system under strain. These unique characteristics make $α$-Li$_{\rm 3} $N-type crystal structure an ideal playground to achieve various types of novel fermions well-suited for technological applications.
description: Article as accepted for publication in Physical Review B; 11 pages, 10 figures
Exact solutions for Big Bounce in loop quantum cosmology
Creators: name: Mielczarek, Jakub
name: Stachowiak, Tomasz
name: Szydlowski, Marek
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we study the flat (k=0) cosmological FRW model with holonomy corrections of Loop Quantum Gravity. The considered universe contains a massless scalar field and the cosmological constant Lambda. We find analytical solutions for this model in different configurations and investigate its dynamical behaviour in the whole phase space. We show the explicit influence of Lambda on the qualitative and quantitative character of solutions. Even in the case of positive Lambda the oscillating solutions without the initial and final singularity appear as a generic case for some quantisation schemes.
description: 12 pages, 12 figures, added references and changed introduction and summary
Carcass Characteristics, Meat Quality and Eating Quality of Culled Dairy cows
Creators: name: Jarunan Chainam
Publisher: name: กองบริหารการวิจัย
Year: 2019
Subjects: Carcass characteristics, Culled dairy cows, Dairy beef, Marbling score, Meat quality

description: Science & Technology Asia, 24, 3, 47-58
Διάσπαση προσοχής στο Νηπιαγωγείο και η σύνδεσή της με εμφάνιση σχολικών και μαθησιακών δυσκολιών:
Creators: name: Λαδοπούλου, Ελένη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Διάσπαση προσοχής
Μαθησιακές δυσκολίες
Σχολικές δυσκολίες
Προσοχή
Προσχολική ηλικία
Attention problems
Learning disabilities
School problems
Attention
Preschool education

description: Η είσοδος του παιδιού στο περιβάλλον του νηπιαγωγείου, το φέρνει αντιμέτωπο με νέες απαιτήσεις για συμμετοχή σε δομημένες καταστάσεις που απαιτούν προσοχή και συγκέντρωση γι αυτό και τα σχολικά πλαίσια είναι συχνά εκείνα που αναδύουν ένα πρόβλημα διάσπασης προσοχής. Τα χαρακτηριστικά των παιδιών με διάσπαση προσοχής είναι κυρίως η δυσκολία τους να καταπιαστούν και να ολοκληρώσουν μια δραστηριότητα ενώ συχνά η διάσπαση προσοχής συνοδεύεται από παρορμητικότητα και υπερκινητικότητα, συμπεριφορές που είναι πιο έκδηλες και αναφέρονται συχνότερα στο νηπιαγωγείο. Σε ακραίες περιπτώσεις τα χαρακτηριστικά αυτά συνδέονται με την Διαταραχή Ελλειμματικής Προσοχής με Υπερκινητικότητα. Έρευνες έχουν δείξει ότι η διαταραχή αυτή συνδέεται ειδικότερα με τις μαθησιακές δυσκολίες. Σε κάθε περίπτωση η διάσπαση προσοχής συνδέεται με την μάθηση και την εμφάνιση ακαδημαικών δυσκολιών κατά την σχολική ηλικία, γεγονός που καθιστά την ανάγκη για πρώιμη παρέμβαση επιτακτική. Ο ρόλος του νηπιαγωγού είναι σημαντικός γιατί είναι αυτός που καλείται να διακρίνει και να αξιολογήσει ένα πρόβλημα διάσπασης προσοχής καθώς και να σχεδιάσει και να εφαρμόσει ένα πρόγραμμα παρέμβασης που θα βασίζεται στα κίνητρα και θα λειτουργεί αντισταθμιστικά προς τους παράγοντες εκείνους που οδηγούν σε σχολικές δυσκολίες.
description: Children introduced to the preschool environment are confronted with new demands for participation in structured situations that require attention and concentration; hence, school contexts are often those that manifest attention deficit problems. Children featuring attention deficit problems find it difficult to engage in and complete an activity while often attention deficit problems are accompanied by impulsivity and hyperactivity, behavior which is more apparent and reported more often in preschool. In extreme cases, these characteristics are connected to Attention Deficit Disorder with Hyperactivity (ADD/H). Studies have shown that this disorder is related in particular to learning disabilities. In all cases, attention deficit problems are connected to learning and the surfacing of academic difficulties during school life, a fact which makes the need for early intervention urgent. A preschool educator has got an important role since s/he is the one called upon to discern and evaluate an attention deficit problem along with planning and implementing an intervention plan. Such a routine should be based on motivation and counterbalance those factors leading to school difficulties.
Role of Jet Spacing and Strut Geometry on the formation of Large Scale Structures & Mixing Characteristics
Creators: name: Soni, Rahul Kumar
name: De, Ashoke
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The present study primarily focuses on the effect of jet spacing and strut geometry on the evolution and structure of the large-scale vortices which play a key role in mixing characteristics in turbulent supersonic flows. Numerically simulated results corresponding to varying parameters such as strut geometry and jet spacing (Xn=nDj such that n=2, 3 & 5) for square jet of height Dj=0.6 mm is presented in the current study, while the work also investigates the presence of the local quasi-two-dimensionality for the X2(2Dj) jet spacing; however, the same is not true for higher jet spacing. Further, the tapered strut (TS) section is modified to the straight strut (SS) for investigation, where the remarkable difference in flow physics is unfolded between the two configurations for similar jet spacing (X2: 2Dj). The instantaneous density and vorticity contours reveal the structures of varying scales undergoing different evolution for the different configurations. The effect of local spanwise rollers is clearly manifested in the mixing efficiency and the jet spreading rate. SS configuration exhibits excellent near field mixing behavior amongst all the arrangements. However, in case of TS cases, only X2(2Dj) configuration performs better due to the presence of local spanwise rollers. The qualitative and quantitative analysis reveals that near-field mixing is strongly affected by the two-dimensional rollers, while the early onset of wake mode is another crucial parameter to have improved mixing. Modal decomposition performed for SS arrangement sheds light into the spatial and temporal coherence of the structures, where the most dominant structures are found to be the Von-Karman street vortices in the wake region.
Online Learning With Adaptive Rebalancing in Nonstationary Environments
Creators: name: Malialis, Kleanthis
name: Panayiotou, Christos G.
name: Polycarpou, Marios M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: An enormous and ever-growing volume of data is nowadays becoming available in a sequential fashion in various real-world applications. Learning in nonstationary environments constitutes a major challenge, and this problem becomes orders of magnitude more complex in the presence of class imbalance. We provide new insights into learning from nonstationary and imbalanced data in online learning, a largely unexplored area. We propose the novel Adaptive REBAlancing (AREBA) algorithm that selectively includes in the training set a subset of the majority and minority examples that appeared so far, while at its heart lies an adaptive mechanism to continually maintain the class balance between the selected examples. We compare AREBA with strong baselines and other state-of-the-art algorithms and perform extensive experimental work in scenarios with various class imbalance rates and different concept drift types on both synthetic and real-world data. AREBA significantly outperforms the rest with respect to both learning speed and learning quality. Our code is made publicly available to the scientific community.
description: Keywords: class imbalance, concept drift, neural networks, nonstationary environments, online learning. in IEEE Transactions on Neural Networks and Learning Systems
Συμπίεση δεδομένων τρισδιάστατης σχεδιοκίνησης σε μορφή πλέγματος:
Creators: name: Καψούρας, Ιωάννης Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Σχεδιοκίνηση
Τρισδιάστατη
Συμπίεση
Gauss-Jordan
Animation
3d mesh
Compression

description: Στη συγκεκριμένη εργασία υλοποιείται μια μέθοδος συμπίεσης δεδομένων τρισδιάστατης σχεδιοκίνησης, τα οποία αναπαρίστανται με μορφή πλέγματος. Για να γίνει η συμπίεση εφαρμόζεται η απαλοιφή Gauss-Jordan. Η μέθοδος Gauss-Jordan εφαρμόζεται στον πίνακα συμμεταβλητότητας των δεδομένων για να βρεθεί αν υπάρχουν δεδομένα που μπορούν να απολοιφθούν. Επειτα τα αρχικά δεδομένα εκφράζονταισε συνάρτηση του υποσυνόλου των δεδομένων και κάποιων παραμέτρων, οι οποίοι σε συνδυασμό με το υποσύνολο των δεδομένων εκτιμούν τα αρχικά δεδομένα.
description: In this research there is presentation for a compression method for animation data mesh. The method uses the Gausss-Jordan elimination. Gauss-Jordan elimination is used in the covariance matrix of the data. Through the Gauss-Jordan elimination data that are not needed can be found. At the end a subgroup of the data and a number of coefficients are used to estimate the initial data.
Dis/counting of women : a critical feminist analysis of two secondary social studies textbooks
Creators: name: Tupper, Jennifer
Publisher: name: University of British Columbia
Year: 2009

description: Two secondary social studies textbooks, Canada: A Nation Unfolding, and Canada Today were analyzed with regard to the inclusion of the lives, experiences, perspectives and contributions of females throughout history and today. Drawing on the existing literature,-a framework of analysis was created comprised of four categories: 1) language; 2) visual representation; 3) positioning and; 4) critical analysis of content. Each of these categories was further broken into a series of related subcategories in order to examine in depth and detail, the portrayal of women in these two textbooks. Each book was carefully read and then analyzed for instances of gender bias as informed by the analytical framework. Neither of the books was. free from gender bias. Although the authors of the textbooks are careful to employ gender inclusive language, language used to describe women's lives, experiences and contributions is problematic. It often denies them agency and categorizes them as members of nameless, faceless collectives. Visually, women in these two textbooks are under represented, and the manner of the representation is problematic, particularly when attention is given to traditional and non-traditional roles (for both men and women). Frequently, information about women is included outside of the main text, reinforcing their historical marginalization. Finally, the textbooks were found to be neither fair or equitable with regard to women's historical contributions.
Drude weight in systems with open boundary conditions
Creators: name: Rigol, Marcos
name: Shastry, B. Sriram
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: For finite systems, the real part of the conductivity is usually decomposed as the sum of a zero frequency delta peak and a finite frequency regular part. In studies with periodic boundary conditions, the Drude weight, i.e., the weight of the zero frequency delta peak, is found to be nonzero for integrable systems, even at very high temperatures, whereas it vanishes for generic (nonintegrable) systems. Paradoxically, for systems with open boundary conditions, it can be shown that the coefficient of the zero frequency delta peak is identically zero for any finite system, regardless of its integrability. In order for the Drude weight to be a thermodynamically meaningful quantity, both kinds of boundary conditions should produce the same answer in the thermodynamic limit. We shed light on these issues by using analytical and numerical methods.
description: 4 pages, 4 figures. Published version (PRB Editors' Suggestions)
Current-induced orbital magnetization in systems without inversion symmetry
Creators: name: Hara, D.
name: Bahramy, M. S.
name: Murakami, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In systems with time-reversal symmetry, the orbital magnetization is zero in equilibrium. Recently, it has been proposed that the orbital magnetization can be induced by an electric current in a helical crystal structure in the same manner as that in a classical solenoid. In this paper, we extend this theory and study the current-induced orbital magnetization in a broader class of systems without inversion symmetry. First, we consider polar metals which have no inversion symmetry. We find that the current-induced orbital magnetization appears in a direction perpendicular to the electric current even without spin-orbit coupling. Using the perturbation method, we physically clarify how the current-induced orbital magnetization appears in polar metals. As an example, we calculate the current-induced orbital magnetization in SnP, and find that it might be sufficiently large for measurement. Next, we consider a two-dimensional system without inversion symmetry. We establish a method to calculate the current-induced orbital magnetization in the in-plane direction by using real-space coordinates in the thickness direction. By applying this theory to surfaces and interfaces of insulators, we find that an electric current along surfaces and interfaces induces an orbital magnetization perpendicular to the electric current.
description: 12 pages, 11 figures, to appear in Phys. Rev. B
Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, September 16, 1943
Creators: name: Trustees Of The Winfield And Okanagan Centre Irrigation District
Publisher: name: The University of British Columbia
Year: 2017

description: Minutes of meeting of the Trustees of the Winfield and Okanagan Centre Irrigation District, dated September 16, 1943, regarding the Conservation Fund, increasing irrigation rates and domestic water.
Οψεις της μαρξιστικής λογοτεχνικής κριτικής. Η περίπτωση του Μανόλη Λαμπρίδη:
Creators: name: Αντωνογιάννη, Παρασκευή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Λογοτεχνική κριτική
Μεταπολεμική περίοδος
Ανθρωπιστικός μαρξισμός
Περιοδική έκδοση
Critic of literature
Humanistic marxism

description: Αν το πεδίο της λογοτεχνικής κριτικής ως μια πολιτισμική πρακτική μετα-λόγου για τα νοητικά συστήματα ή τις αισθητικές αξιολογήσεις των καλλιτεχνικών προϊόντων αξιώνει τη διάκριση από τον μελετητή μεταξύ της θεσμικής (διατήρηση της κυρίαρχης τροπικότητας του πολιτισμικού σχηματισμού) και της μετασχηματιστικής της λειτουργίας (ανατροπή της θεσμικής κριτικής λειτουργίας), τότε, σε μια προσπάθεια να ορίσουμε το ερευνητικό πεδίο της παρούσας εργασίας, βρισκόμαστε μπροστά σε ένα παράδειγμα φιλοσοφικού κριτικού λόγου για τη λογοτεχνία, που βγαλμένο μέσα από τους κόλπους της αριστερής θεωρητικής σκέψης, σκιαγραφεί τα θολά όρια του μετασχηματιστικού μοντέλου της εγχώριας πρακτικής κριτικής.Με τον όρο «πρακτική κριτική» ορίζεται, κατά το ταξινομητικό σχήμα του Edward Said, η αισθητική αποτίμηση της επίκαιρης λογοτεχνικής παραγωγής σε ημερήσια ή περιοδικά έντυπα, μια λειτουργία της λογοτεχνικής κριτικής που εξάσκησε ο Μανόλης Λαμπρίδης σε όλη τη διάρκεια του δοκιμιακού του έργου, επιστρατεύοντας εργαλεία της λογοτεχνικής θεωρίας και της φιλοσοφικής κριτικής, όπως τα παρέδωσαν οι μαρξιστές στοχαστές που ο κριτικός διάβαζε και θαύμαζε.Στην παρούσα σπουδή θα προσεγγίσουμε το έργο του Μανόλη Λαμπρίδη σε μια προσπάθεια ανίχνευσης των ορίων του λόγου του, όρια που εξω-καθορίζονται από τις ιδέες της συγκυρίας, εννοούμε τόσο την κανονιστική, κυρίαρχη ως τα τέλη της δεκαετίας του ’50, μαρξιστική εκδοχή για την τέχνη όσο και το άνοιγμα που φέρνει στη μαρξιστική αισθητική θεωρία η απήχηση των έργων των Trotski, Lukács, Lefebvre και των δυτικών θεωρητικών που ακολουθούν, ορίζοντας το διάλογο του κριτικού με το ρεύμα του θεωρητικού ανθρωπισμού και τις ιστορικές και επιστημολογικές του ορίζουσες.
description: If the domain of literary criticism as a cultural practice of discourse about the mental systems or the aesthetic analysis of artifacts demands the distinction between the institutional and subversive critical function, then –in an attempt to specify the field of this essay- we are facing an example of philosophical critical discourse, which, proceeding from the left critical theory, belongs to the subversive form of the native practical criticism (according to Edward Said). In this essay, we will study the practical criticism of Manolis Labridis and, specifically, his aesthetic analysis of literature published to literary magazines from 1950 to 1967, i.e. his interaction with the philosophical critical theory of Georg Lukacs, Lucien Lefebvre and the other founding fathers of Hegelian Western Marxism.
FM Modulated Smart Drug Algorithm for the treatment of Cancer Cells
Creators: name: Emin T. E.
name: İhsan Ömür B.
Publisher: name: gjrpublication
Year: 2024

description: This research work presents an alternative treatment method of cancer cells analogous to the earlier work entitled “Modeling and Simulation of Smart-Drug Algorithms Through Frequency Modulation for the Treatment of Covid- 19 and Similar Viruses” [1]. In another words, it includes a further and extended phase of the previous research and it covers an application of the medical treatment of cancer cell viruses. Based on the analogy to be elaborated here, it is predicted that cancer cells may behave similarly to the structured RNA viruses such as Covid-19 and other coronaviruses. Therefore, it explains modeling and simulation of a smart-drug algorithm, controlled by a biorobotic system, through Frequency Modulation (FM) for the medical treatment of cancer cells. The method discussed here is based on the assumption that the frequency variations for both the RNA configuration of the cancer cell and the drug algorithm are in sinusoidal waveform. Accordingly, when the FM range of the drug algorithm created by the bio-robotic system coincides with the range of the frequency variation of the structured RNA configuration of the cancer cell, cancer activation is terminated in a similar manner to the energy distribution produced by two mutually canceling sinusoidal wave forms. This thermodynamic interaction between the cancer cell and the drug over the boundaries of the existing open cell system will lead to the disruption of the working mechanism of the cancer cell's RNA structure. As a result, the negative effects of the cancer cell can be counteracted by slowing it down and the immune system can regain control of the body, and finally the patient's treatment will progress for the better. It is a fact that under the condition of the successful implementation of the medical treatment method described here, promising progress will be made in the treatment of cancer disease.
AdaSpring: Context-adaptive and Runtime-evolutionary Deep Model Compression for Mobile Applications
Creators: name: Liu, Sicong
name: Guo, Bin
name: Ma, Ke
name: Yu, Zhiwen
name: Du, Junzhao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: There are many deep learning (e.g., DNN) powered mobile and wearable applications today continuously and unobtrusively sensing the ambient surroundings to enhance all aspects of human lives. To enable robust and private mobile sensing, DNN tends to be deployed locally on the resource-constrained mobile devices via model compression. The current practice either hand-crafted DNN compression techniques, i.e., for optimizing DNN-relative performance (e.g., parameter size), or on-demand DNN compression methods, i.e., for optimizing hardware-dependent metrics (e.g., latency), cannot be locally online because they require offline retraining to ensure accuracy. Also, none of them have correlated their efforts with runtime adaptive compression to consider the dynamic nature of the deployment context of mobile applications. To address those challenges, we present AdaSpring, a context-adaptive and self-evolutionary DNN compression framework. It enables the runtime adaptive DNN compression locally online. Specifically, it presents the ensemble training of a retraining-free and self-evolutionary network to integrate multiple alternative DNN compression configurations (i.e., compressed architectures and weights). It then introduces the runtime search strategy to quickly search for the most suitable compression configurations and evolve the corresponding weights. With evaluation on five tasks across three platforms and a real-world case study, experiment outcomes show that AdaSpring obtains up to 3.1x latency reduction, 4.2 x energy efficiency improvement in DNNs, compared to hand-crafted compression techniques, while only incurring <= 6.2ms runtime-evolution latency.
description: Ubicomp 2021
Astrophysical Probes of Fundamental Physics
Creators: name: Martins, C. J. A. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I review the theoretical motivation for varying fundamental couplings and discuss how these measurements can be used to constrain a number of fundamental physics scenarios that would otherwise be inacessible to experiment. As a case study I will focus on the relation between varying couplings and dark energy, and explain how varying coupling measurements can be used to probe the nature of dark energy, with important advantages over the standard methods. Assuming that the current observational evidence for varying $α$ and $μ$ is correct, a several-sigma detection of dynamical dark energy is feasible within a few years, using currently operational ground-based facilities. With forthcoming instruments like CODEX, a high-accuracy reconstruction of the equation of state may be possible all the way up to redshift $z\sim4$.
description: Invited Review talk at the ESO Precision Spectroscopy in Astrophysics conference, to appear in the proceedings
A review of simulation and performance modeling for the Roman coronagraph instrument
Creators: name: Douglas, Ewan S.
name: Ashcraft, Jaren N.
name: Belikov, Ruslan
name: Debes, John
name: Kasdin, Jeremy
name: Krist, John
name: Lacy, Brianna I.
name: Nemati, Bijan
name: Milani, Kian
name: Pogorelyuk, Leonid
name: Riggs, A. J. Eldorado
name: Savransky, Dmitry
name: Sirbu, Dan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) will be capable of characterizing exoplanets in reflected light and will demonstrate space technologies essential for future missions to take spectra of Earthlike exoplanets. As the mission and instrument move into the final stages of design, simulation tools spanning from depth of search calculators to detailed diffraction models have been created by a variety of teams. We summarize these efforts, with a particular focus on publicly available datasets and software tools. These include speckle and point-spread-function models, signal-to-noise calculators, and science product simulations (e.g. predicted observations of debris disks and exoplanet spectra). This review is intended to serve as a reference to facilitate engagement with the technical and science capabilities of the CGI instrument.
description: 11 pages, 5 figures
Identical-particle (pion and kaon) femtoscopy in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with Therminator2 modeled with (3+1)D viscous hydrodynamics
Creators: name: Chakraborty, Pritam
name: Pandey, Ashutosh Kumar
name: Dash, Sadhana
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The three-dimensional femtoscopic correlations of pions and kaons are presented for Pb$-$Pb collisions at \rootsNN = 5.02 TeV within the framework of (3+1)D viscous hydrodynamics combined with THERMINATOR 2 code for statistical hadronization. The femtoscopic radii for pions and kaons are obtained as a function of pair transverse momentum and centrality in all three pair directions. The radii showed a decreasing trend with an increase of pair transverse momentum and transverse mass for all centralities. These observations indicate the presence of strong collectivity. A simple effective scaling of radii with pair transverse mass was observed for both pion and kaons.
description: 10 pages, 10 figures
Εκτιμηση εθνικης συνάρτησης παραγωγής γνώσης για τα πανεπιστήμια: Η περίπτωση του ΟΟΣΑ:
Creators: name: Πετρίδης, Νικόλαος Ευστρατίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2009
Subjects: Συνάρτηση παραγωγής γνώσης Ποιότητα πανεπιστημίων Εκτίμηση με Panel Data
Knowledgw Production Function
Quality of Universities
Panel Data Estimation

description: Στην εργασία αυτή εκτιμούμε την εθνική συνάρτηση παραγωγής γνώσης για τα πανεπιστημία των χωρών μελών του ΟΟΣΑ, χρησιμοποιώντας δεδομένα για 27 χώρες για τα έτη 1995-2007.Ελέγχουμε την υπόθεση ότι η ποιότητα των πανεπιστημίων επιδρά στην δημιουργία νεών πατεντών. Ώς ποιότητα των πανεπιστημίων χρησιμοποιούμε αντιπροσωπευτική μεταβλητή, τους ερευνητες οι οποίοι δημοσιεύουν συχνότερα στον τομέα του ακαδημαϊκoύ τους ενδιαφέροντος. Εκτός απο αυτή την ποιότητα χρησιμοποιούνται ο αριθμός των συνολικών ερευνητών που απασχολούνται πλήρως στον τομέα της έρευνας και τεχνολογίας, η ακαθάριστη δαπάνη που πραγματοποιείται για έρευνα και τεχνολογία ώς εισροές και ο αριθμός των συνολικών πατεντών ώς εκροή. Εκτιμούμε την εθνική συνάρτηση παραγωγής γνώσης, με την χρήση μιας pooled παλινδρόμησης αρχικά και ύστερα εισάγεται σταθερό αποτέλεσμα (fixed effect) και τυχαίο αποτέλεσμα (random effect). Οι συντελεστές της παλινδρόμησης είναι στατιστικά σημαντικοι και δείχνουν τις μερικές ελεστικότητες κάθε ανεξάρτητης μεταβλητής, εισροής, ώς πρός την εξαρτημένη μεταβλητή, εκροή. Βρίσκουμε ότι η ποιότητα των πανεπιστημίων επιδρά σημαvτικά στην παραγωγή νέας γνώσης όχι όμως τόσο σημαντικά όσο οι υπόλοιπες εισροές της συνάρτησης παραγωγής γνώσης.
description: In this project we estimate the national knowledge production function for universities of the countries of OECD, using data for 27 countries for the period 1995-2007.We test the hypothesis that quality of universities affect the creation of new patents. Quality is represented by the variable "High cited Researchers" which has been obtained from the Univresity Shangai. We find that quality is playing an important role in the creation of new knowledge.
Kleinschwärzer-Meister, Brigitta: Gnade im Zeichen
Creators: name: Müller, Wolfgang W.
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 52 Nr. 1 (2003): Ökumenische Rundschau, Band 52, Heft 1
Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
Creators: name: Tavecchio, F.
name: Ghisellini, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Simple one-zone homogeneous synchrotron self-Compton models have severe difficulties in explaining the TeV emission observed in the radiogalaxy M87. Also the site of the TeV emission region is uncertain: it could be the unresolved jet close to the nucleus, analogously to what proposed for blazars, or an active knot, called HST-1, tens of parsec away. We explore the possibility that the TeV emission of M87 is produced in the misaligned subpc scale jet. We base our modelling on a structured jet, with a fast spine surrounded by a slower layer. In this context the main site responsible for the emission of the TeV radiation is the layer, while the (debeamed) spine accounts for the emission from the radio to the GeV band: therefore we expect a more complex correlation with the TeV component than that expected in one-zone scenarios, in which both components are produced by the same region. Observed from small angles, the spine would dominate the emission, with an overall Spectral Energy Distribution close to those of BL Lac objects with a synchrotron peak located at low energy (LBLs).
description: 5 pages, 2 figures. Accepted for publication in MNRAS Letters
A stiffness sensor to help in the diagnosis and the surgery of orbital pathologies
Creators: name: Luboz, Vincent
name: Ambard, Dominique
name: Boutault, Franck
name: Swider, Pascal
name: Payan, Yohan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Proptosis is characterized by a protrusion of the eyeball due to an increase of the orbital tissue volume. To recover a normal eyeball positioning, the most frequent surgical technique (BROD technique) consists in the osteotomy of orbital walls combined with a loading on the eyeball to initiate tissue decompression. In this paper, a stiffness sensor device is proposed to (1) provide to the surgeon pre, intra and post-operative data concerning the stiffness of the intra-orbital soft tissues, and (2) provide constitutive parameters to the Finite Element model of the intra-orbital tissues already developed by the authors and used to predict consequences orbital surgery.
On explosive boiling of a multicomponent Leidenfrost drop
Creators: name: Lyu, Sijia
name: Tan, Huanshu
name: Wakata, Yuki
name: Yang, Xianjun
name: Law, Chung K.
name: Lohse, Detlef
name: Sun, Chao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The gasification of multicomponent fuel drops is relevant in various energy-related technologies. An interesting phenomenon associated with this process is the self-induced explosion of the drop, producing a multitude of smaller secondary droplets, which promotes overall fuel atomization and, consequently, improves the combustion efficiency and reduces emissions of liquid-fueled engines. Here, we study a unique explosive gasification process of a tricomponent droplet consisting of water, ethanol, and oil ("ouzo"), by high-speed monitoring of the entire gasification event taking place in the well-controlled, levitated Leidenfrost state over a superheated plate. It is observed that the preferential evaporation of the most volatile component, ethanol, triggers nucleation of the oil microdroplets/nanodroplets in the remaining drop, which, consequently, becomes an opaque oil-in-water microemulsion. The tiny oil droplets subsequently coalesce into a large one, which, in turn, wraps around the remnant water. Because of the encapsulating oil layer, the droplet can no longer produce enough vapor for its levitation, and, thus, falls and contacts the superheated surface. The direct thermal contact leads to vapor bubble formation inside the drop and consequently drop explosion in the final stage.
description: 8 pages, 5 figures