cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Les services du cloud européen EOSC et des infrastructures de recherche européennes pour les sciences de la vie
Creators: name: David, Romain
Publisher: name: Zenodo
Year: 2024
Subjects: EOSC
Union européenne
données scientifiques
infrastructures de recherche
collaboration
innovation
recherche biomédicale
stockage des données
analyse de big data
protection des données

description: L'European Open Science Cloud (EOSC) est une initiative majeure de l'Union européenne, visant à créer un environnement numérique intégré pour l'accès et le partage des données scientifiques. Dans les sciences de la vie, l'EOSC, en collaboration avec les infrastructures de recherche en sciences de la vie (LS-RI) telles qu'ELIXIR, BBMRI, et Euro-BioImaging, joue un rôle fondamental pour soutenir la recherche, faciliter la collaboration et stimuler l'innovation. Ces infrastructures fournissent des outils, des données et des services essentiels pour la recherche biomédicale, génomique, protéomique, et d'autres domaines connexes. L'EOSC propose des services spécialisés pour le stockage, le traitement et l'analyse des données issues des LS-RI, y compris des plateformes pour l'intelligence artificielle, l'analyse de big data, ainsi que des outils et des groupes d'experts pour la gestion et le partage de données. Ces services permettent aux chercheurs d'accéder à des ressources informatiques et à des bases de données consolidées, tout en améliorant la collaboration interdisciplinaire à travers l'Europe. L'EOSC et les LS-RI facilitent aussi le respect des normes éthiques et légales, notamment en matière de protection des données sensibles. Des exemples concrets montrent comment l'EOSC et les LS-RI ont permis des avancées significatives dans des projets de recherche en biologie, médecine, et bioinformatique, grâce à des partenariats entre centres de recherche, infrastructures et entreprises biotech. L'EOSC, en synergie avec les LS-RI, est un levier pour l'innovation et la collaboration dans les sciences de la vie, offrant aux chercheurs des outils indispensables pour faire progresser la recherche de manière rapide, efficace et interconnectée, tout en aidant à une meilleure intégration des normes et standards européens.
A novel method to test particle ordering and final state alignment in helicity formalism
Creators: name: Wang, Mengzhen
name: Jiang, Yi
name: Liu, Yinrui
name: Qian, Wenbin
name: Lyu, Xiaorui
name: Zhang, Liming
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In this article, the importance is demonstrated of a proper choice of reference particles for decay angle definitions, when constructing partial-wave amplitude of multi-body decays using helicity formalism. This issue is often ignored in the standard use case of the helicity formalism. A new technique is proposed to determine the correct particle ordering, and can also be used as a generalized method to calculate the rotation operators used for the final-state alignment between different decay chains. Numerical validations are also performed to support the arguments and new technique proposed in this article.
description: 16 pages, 4 figures
Supersymmetric economical 3-3-1 model
Creators: name: Dong, P. V.
name: Huong, D. T.
name: Rodriguez, M. C.
name: Long, H. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The supersymmetric extension of the economical 3-3-1 model is presented. The constraint equations and the gauge boson identification establish a relation between the vacuum expectation values (VEVs) at the top and bottom elements of the Higgs triplet $χ$ and its supersymmetric counterpart $χ^\prime$. Because of this relation, the exact diagonalization of neutral gauge boson sector has been performed. The gauge bosons and their associated Goldstone ones mix in the same way as in non-supersymmetric version. This is also correct in the case of gauginos. The eigenvalues and eigenstates in the Higgs sector are derived. The model contains a heavy neutral Higgs boson with mass equal to those of the neutral non-Hermitian gauge boson $X^0$ and a charged scalar with mass equal to those of the $W$ boson in the standard model, i. e. $ m_{\varrho_1} = m_W$. This result is in good agreement with the present estimation: $m_{H^\pm} > 79.3$ GeV, CL= 95 %. We also show that the boson sector and the fermion sector gain masses in the same way as in the non-supersymmetric case.
description: 33 pages
Unfolding the non-coding RNA landscape in pluripotency and differentiation
Creators: name: Ben-El, Rina
name: Kashish  Chetal
name: Salomonis, Nathan
name: Mandel-Gutfreund, Yael
Publisher: name: F1000 Research Limited
Year: 2019

description: Human Pluripotent Stem Cells (PSCs) are characterized by their self-renewal capacity and their ability to differentiate into every cell type in the body. Deciphering the molecular factors that are involved in stem cell fate decision is crucial to understanding human development. Transcription Factors (TFs) are known to play key roles in maintaining the stem cell state and in differentiation to each of the three germ line layers. In recent years, long non-coding RNAs (lncRNAs) have emerged as regulators of pluripotency and differentiation. To study the role of lncRNAs in stem cell fate, we generated RNA-seq data from eleven time points during directed differentiation to cardiomyocytes. We clustered the lncRNAs with known markers of pluripotency and differentiation which revealed over 500 differentially expressed non-coding RNAs, putatively involved in different steps of cardiac differentiation. Furthermore, we explored the expression of alternatively spliced isoforms of TFs and lncRNAs throughout the experiment. We discovered dozens of TFs and lncRNA genes, which their alternative transcript shows a distinct pattern of expression during pluripotency and differentiation, suggesting an important role for alternative RNA processing of coding and non-coding RNAs in early human development.
Αντιδράσεις των φαινυλο-ιωδώνιουλιδίων της 4-υδροξυκουμαρίνης, της διμεδόνης και του διβενζόϋλομεθανίου με αρένια και αρωματικές αλδεϋδες καταλυόμενες απο BF3:
Creators: name: Ουδινόττι, Μάριο (Udinotti, Μario)
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Υλίδια Ιωδίου
Κουμαρίνες
Αρυλίωση
Iodonium ylides
Coumarines
Arylation

description: Στην εργασία αυτή έγινε διερεύνηση των αντιδράσεων αρυλίωσης με BF3 στο υλίδιο της 4-υδροξυκουμαρίνης, της διμεδόνης και του διβενζοϋλομεθανίου. Με βάση οτι ενεργοποιημένα αρένια έδωσαν με BF3 την αντίδραση αρυλίωσης με το υλίδιο της λοουσόνης, χρησιμοποιήθηκαν αυτά τα αρένια αλλα και όχι μόνο σε μια σειρά αντιδράσεων με τα 3 υλίδια που αναφέρθηκαν. Αποτέλεσμα αυτής της έρευνας ήταν τα προϊόντα αρυλίωσης τεσσάρων υποστρωμάτων, αυτών της 2,5-διμεθοξυβενζαλδεΰδης, του 1,4-διμεθοξυβενζολίου, του ανθρακενίου και 4-μεθοξυβενζαλδεΰδης με το υλίδιο της 4-ύδροξυκουμαρίνης. Οι αντιδράσεις με τα άλλα υλίδια δεν έδωσαν κάποιο προϊόν.
description: This Msc has researched the coupling reactions with BF3 of 4-hydroxycoumarin ylide, dimedone ylide and dibenzoylmethane ylide. Based on the research that electron-rich arenes have given the coupling products in the reaction with BF3 with loousone ylide, we used this arenes and not only them to a series of reactions with 3 ylides that have been mentioned before. The results of this research were the coupling products of four substrates which are the 2,5-dimeyhoxybenzaldehyde, 1,4-dimethoxybenzene, anthracene and 4-methoxybenzaldehyde with 4-ydroxycoumarin ylide. The reactions with other ylides have not given coupling products.
Ασφάλιση ζωής συνδεδεμένη με επενδύσεις:
Creators: name: Λαζαρίδης, Νικόλαος Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ασφάλιση
Ζωή
Επενδύσεις
Insurance
Life
Investments

description: Σκοπός τη διατριβής ήταν η μελέτη και παρουσίαση της ασφάλισης ζωής που συνδέεται με επενδύσεις. Αρχικά επιχειρήσαμε να παρουσιάσουμε τα γενικά χαρακτηριστικά της ασφάλισης αυτής. Εν συνεχεία περιγράψαμε το νομοθετικό πλαίσιο το οποίο διέπει την ειδικότερη αυτή μορφή ασφάλισης. Περαιτέρω προσπαθήσαμε να ορίσουμε την έννοια αυτής, τα μερικότερα στοιχεία της και να παρουσιάσουμε τον τρόπο λειτουργίας της. Κατόπιν περιγράψαμε τις υποχρεώσεις της ασφαλιστικής επιχείρησης και τις συνέπειες από την αθέτηση αυτών καθώς και τα ειδικά δικαιώματα που έχει ο ασφαλισμένος. Τέλος επιχειρήσαμε μια συγκριτική θεώρηση της ασφάλισης αυτής και της παροχής επενδυτικών υπηρεσιών και εξετάσαμε την προστασία του ασφαλισμένου ως καταναλωτή.
description: The aim of the thesis was the study and the presentation of the life insurance-related investments. Firstly we tried to present the general characteristics of this insurance. Then we described the legislative framework which governs this specific form of insurance. Further we tried to define the concept, its special data and illustrate how it works. Then we described the obligations of the insurance company and the consequences of such failure and the specific rights of an insured. Finally we attempted a comparative view of this insurance and investment services and examined the protection of the insured as a consumer.
Theory of quantum impurities in spin liquids
Creators: name: Kolezhuk, Alexei
name: Sachdev, Subir
name: Biswas, Rudro R.
name: Chen, Peiqiu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We describe spin correlations in the vicinity of a generalized impurity in a wide class of fractionalized spin liquid states. We argue that the primary characterization of the impurity is its electric charge under the gauge field describing singlet excitations in the spin liquid. We focus on two gapless U(1) spin liquids described by 2+1 dimensional conformal field theories (CFT): the staggered flux (sF) spin liquid, and the deconfined critical point between the Neel and valence-bond-solid (VBS) states. In these cases, the electric charge is argued to be an exactly marginal perturbation of the CFT. Consequently, the impurity susceptibility has a 1/T temperature dependence, with an anomalous Curie constant which is a universal number associated with the CFT. One unexpected feature of the CFT of the sF state is that an applied magnetic field does not induce any staggered spin polarization in the vicinity of the impurity (while such a staggered magnetization is present for the Neel-VBS case). These results differ significantly from earlier theories of vacancies in the sF state, and we explicitly demonstrate how our gauge theory corrects these works. We discuss implications of our results for the cuprate superconductors and organic Mott insulators.
description: 16 pages, 7 figures; (v2) added discussion on relevance to graphene; (v3) corrected estimate of size of bound state in the spin gap phase; (v4) corrected technical problem with pdf; (v5) corrected error in Eq. (2.13), pointed out by Max Metlitski
title: A state-space model for estimating detailed movements and home range from acoustic receiver data
Creators: name: Pedersen, Martin W
name: Weng, Kevin
Publisher: name: ASC 2013 - Theme session O
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author. We present a state-space model for acoustic receiver data to estimate detailed movement and home range of individual fish while accounting for spatial bias. An integral part of the approach is the detection function, which models the probability of logging tag transmissions as a function of distance to receiver. The same function is used to provide absence information at times where no detections occur. In a simulation study we found that the ability of the state-space model to estimate detailed movements outperform existing non-mechanistic techniques in terms of location error. We also found that the location error scales log-linearly with detection range and movement speed. This result can be used as guideline for designing network layout when species movement capacity and acoustic environment are known or can be estimated prior to network deployment. Finally, as an example, the state-space model is used to estimate home range and movement of a reef fish in the Pacific Ocean
Πολλαπλά συστήματα Δειγματοληψίας και Δειγματοληψία στο Διαδίκτυο:
Creators: name: Παπουλίδου, Ελίνα Ηρακλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Διπλό σύστημα δειγματοληψίας
Δειγματοληψία στο διαδίκτυο
Σπάνιοι πληθυσμοί
Dual sampling
Web sampling
Rare population

description: Σε αυτήν τη διπλωματική εργασία παρουσιάζουμε τα Πολλαπλά Συστήματα Δειγματοληψίας και την Δειγματοληψία στο Διαδίκτυο . Αρχικά στο Κεφάλαιο 1 περιγράφουμε τα μοντέλα επαναληπτικής δειγματοληψιάς , την εκτίμηση των διπλών δειγματοληπτικών συστημάτων και την επίδραση της ετερογένειας πληθυσμών στα μοντέλα . Στο Κεφάλαιο 2 συζητιούνται οι γενικές τεχνικές της δημογραφικής ανάλυσης σαν ένα αναλυτικό εργαλείο για την κάλυψη των μετρήσεων, συμπεριλαμβάνοντας τη χρήση λογιστικών συναρτήσεων, συνιστωσών δεδομένων, τη σταθερότητα της μεθόδου αλλά και τους περιορισμούς της. Περιγράφονται υποδείγματα κάλυψης πληθυσμού. Στην συνέχεια στο Κεφάλαιο 3 ασχολούμαστε με την Δειγματοληψία στο Διαδίκτυο και τις έρευνες στο διαδίκτυο. Σε αυτή την ενότητα επίσης επισημοποιούμε το πρόβλημα της δειγματοληψίας και της αποτίμησης σε γραφήματα δικτύων, περιγράφουμε τη διαχείριση των διατάξεων δειγματοληψίας κοινού δικτύου, και αναπτύσουμε τους εκτιμητές των γραφημάτων δικτύων. Τέλος , το Κεφάλαιο 4 αναφέρεται στους σπάνιους (υπο- )πληθυσμούς και πως θα μπορούσαν να προσδιοριστούν τα μέλη του σπάνιου πληθυσμού.
description: At this project we study the multiple sampling systems in general and the sampling in web. First, Chapter 1 presents the capture – recapture models in connection with the effects of heterogeneity of the population. In Chapter 2, the general techniques of demographic analysis as an analytic tool for coverage measurement are discussed , including use of the demographic accounting equation, data components,and strengths and limitations of the method . Patterns of coverage are described. In Chapter 3 we deal with sampling in Web and surveys on the Web .Here formalized the problem of sampling and estimation in network graphs, describe a handful of common network sampling designs, and develop estimators of network graphs. Finally, in Chapter 4 deal with rare population .
Visualising Variants on Structure with Jalview
Creators: name: Carstairs, Mungo
name: Procter, Jim
name: Barton, Geoffrey J
Publisher: name: F1000 Research Limited
Year: 2019

description: This was a 5 minute talk to describe the poster of the same title.

Jalview is a free, open source Java workbench for working with sequence alignments and structures, available from http://www.jalview.org. The latest release of Jalview (2.11, July 2019) adds the ability to load genomic variant data from VCF (Variant Call Format) files. This poster describes new features in Jalview for interpretation and visualisation of the rich data from VCF, by colouring linked coding and protein sequences and protein structures.

Jalview reads indexed VCF files using the samtools htsjdk Java library. Variants are added as feature annotation to gene, transcript or coding sequences. Ensembl services are used to lift over genomic coordinates if VCF and sequence use different genome reference assemblies. Variants on reverse strand genes are converted to their reverse complement form. If the VCF is VEP-annotated by Ensembl's Variant Effect Predictor, then transcript-specific consequences are assigned to the respective transcript and coding sequences.

Jalview 2.11 adds the ability to colour and filter sequence annotation by associated data ('attributes'). This allows sophisticated visualisation based on data of interest, such as:
- only show sequence_variant features where PolyPhen predicts damaging or SIFTS predicts deleterious
- graduate missense_variant colour by Allele Count (AC) above zero, darkest colour for lowest count
- only show stop_gained variants
- restrict to a chosen range of allele frequencies in a selected subpopulation (e.g. AF_AFR)
Favourite colour and filter configurations can be saved and reapplied, and all settings may be saved in a Jalview project (session) file.

Jalview 2.11.1 (next release) optionally renders coding sequence annotation as 'virtual features' on protein sequences and structure. This allows all of the flexibility of filtering on the coding sequence to apply through to protein and structural context. Alternative colourings can be rapidly explored to investigate regions of interest on structure. Variant data can be overlaid on selected protein annotation (such as binding sites) to explore potential impact on protein function. Protein variants are computed 'on the fly' from the standard codon and any alleles for each amino acid, and shown in tooltips on protein sequence and Jmol structure viewer. Full details of an individual variant can be displayed in a table on request.

Protein annotation may conversely be overlaid on coding data sequences, for example to show how functional domains relate to exon boundaries.

The poster shows six examples of visualisations exploiting these capabilities, using variant data from the gnomAD exome dataset.
title: Distribution of juvenile bluefin tunas in the North Atlantic: comparison between light based geolocations from internal and pop-up satellite archival tags.
Creators: name: Arregui, Igor
name: Galuardi, Benjamin
name: Goñi, Nicolas
name: Arrizabalaga, Haritz
name: Lam, Chi Hin
name: Fraile, Igaratza
name: Santiago, Josu
name: Lutcavage, Molly
Publisher: name: ASC 2013 - Theme session O
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author. This study aims at comparing light based geolocations from internal and pop-up satellite archival tags implanted on juveniles Bluefin tunas, and to discuss their potential consequences for characterizing bluefin tuna migrations and habitat utilization. From 2005 to 2010, 136 juvenile bluefin tunas were released in the Bay of Biscay with internal archival tags and 29 ones with miniaturized pop-up satellite archival tags. Archived information was recovered from 3 individuals tagged internally and from 15 individuals tagged with PSATs. For both types of tags, an SST-assisted Kalman filter was applied to the raw light-based geolocations. The seasonality of the distribution and movements of the juvenile bluefin tunas were analyzed. We observed that during autumn months (start of the overwintering migration and maximal latitudinal error in light-based geolocation) the standard deviation of the geolocations is lower in average for internal archival tag data than for pop-up tags. The higher spatial dispersion of pop-up tag data position estimates is discussed in relation to the accuracy of the characterization of different migration patterns and habitat use. Despite the difference between both tagging types, these position estimates are considered reliable enough to build a habitat utilization index and to characterize winter migrations.
Time refraction of spin waves
Creators: name: Schultheiss, K.
name: Sato, N.
name: Matthies, P.
name: Körber, L.
name: Wagner, K.
name: Hula, T.
name: Gladii, O.
name: Pearson, J. E.
name: Hoffmann, A.
name: Helm, M.
name: Fassbender, J.
name: Schultheiss, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present an experimental study of time refraction of spin waves propagating in microscopic waveguides under the influence of time-varying magnetic fields. Using space- and time-resolved Brillouin light scattering microscopy, we demonstrate that the broken translational symmetry along the time coordinate can be used to in- or decrease the energy of spin waves during their propagation. This allows for a broadband and controllable shift of the spin-wave frequency. Using an integrated design of spin-wave waveguide and microscopic current line for the generation of strong, nanosecond-long, magnetic field pulses, a conversion efficiency up to 39% of the carrier spin-wave frequency is achieved, significantly larger compared to photonic systems. Given the strength of the magnetic field pulses and its strong impact on the spin-wave dispersion relation, the effect of time refraction can be quantified on a length scale comparable to the spin-wave wavelength. Furthermore, we utilize time refraction to excite spin-wave bursts with pulse durations in the nanosecond range and a frequency shift depending on the pulse polarity.
description: 5 pages, 4 figures
title: Reassembling broken otoliths for population discrimination
Creators: name: Bárðarson, Hlynur
name: McAdam, Bruce
name: Pétursdóttir, Gróa
name: Marteinsdóttir, Guðrún
Publisher: name: ASC 2013 - Theme session O
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author. Twenty five Atlantic cod Gadus morhua otoliths were examined using eight shape measurements along with Fourier analysis of their outlines to test whether discrimination using otolith shape is affected by reassembling broken otoliths. Small differences in seven of the eight shape measurements were found between unbroken otoliths and the same otoliths after breaking and subsequently gluing together; however, none of the Fourier descriptors differed. Cluster analyses indicated that resultant morphological differences will have no impact when applying discriminant analysis.
The Impact of CSI and Power Allocation on Relay Channel Capacity and Cooperation Strategies
Creators: name: Ng, Chris T. K.
name: Goldsmith, Andrea J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Capacity gains from transmitter and receiver cooperation are compared in a relay network where the cooperating nodes are close together. Under quasi-static phase fading, when all nodes have equal average transmit power along with full channel state information (CSI), it is shown that transmitter cooperation outperforms receiver cooperation, whereas the opposite is true when power is optimally allocated among the cooperating nodes but only CSI at the receiver (CSIR) is available. When the nodes have equal power with CSIR only, cooperative schemes are shown to offer no capacity improvement over non-cooperation under the same network power constraint. When the system is under optimal power allocation with full CSI, the decode-and-forward transmitter cooperation rate is close to its cut-set capacity upper bound, and outperforms compress-and-forward receiver cooperation. Under fast Rayleigh fading in the high SNR regime, similar conclusions follow. Cooperative systems provide resilience to fading in channel magnitudes; however, capacity becomes more sensitive to power allocation, and the cooperating nodes need to be closer together for the decode-and-forward scheme to be capacity-achieving. Moreover, to realize capacity improvement, full CSI is necessary in transmitter cooperation, while in receiver cooperation optimal power allocation is essential.
description: Accepted for publication in IEEE Transactions on Wireless Communications
Ανάπτυξη και Τελική Αξιολόγηση διαδικτυακού ραδιοφωνικού σταθμού
Creators: name: Κοπανά, Μαρία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Διαδικτυακός ραδιοφωνικός σταθμός
Μάρκετινγκ και ραδιόφωνο
Έρευνα διαδικτυακού ραδιόφωνου
web radio station
radio marketing
web radio research

description: Η εργασία αποτελεί μια προσπάθεια να μελετηθούν δύο πλευρές του φαινόμενου του διαδικτυακού ραδιόφωνου: α) οι μηχανισμοί ανάπτυξης, προώθησης και μάρκετινγκ των διαδικτυακών σταθμών και β) η διείσδυση του διαδικτυακού ραδιόφωνου στην ελληνική πραγματικότητα, σε σχέση όμως και των δύο, με την δημιουργία και ανάπτυξη ενός πειραματικού διαδικτυακού σταθμού, του «yeyeradio».Στο πρώτο μέρος μελετώνται οι μηχανισμοί ανάπτυξης, προώθησης και μάρκετινγκ των διαδικτυακών σταθμών με την χρήση ενός ερωτηματολογίου. Επίσης, παρουσιάζεται το προωθητικό σχέδιο του πειραματικού διαδικτυακού σταθμού yeyeradio. Τέλος, εξάγονται ενδιαφέροντα συμπεράσματα σχετικά με την εικόνα των διαδικτυακών σταθμών μέσω σύγκρισης των προωθητικών τεχνικών τους με αυτές που χρησιμοποιούνται από τους συμβατικούς σταθμούς. Στο δεύτερο μέρος παρουσιάζεται η περιγραφική έρευνα που διεξάχθηκε στα πλαίσια της βραχύβιας λειτουργίας του διαδικτυακού σταθμού yeyeradio και τα ενδιαφέροντα συμπεράσματα που προέκυψαν. Αντικείμενο της έρευνας αποτέλεσε η στάση του κοινού απέναντι στο διαδικτυακό ραδιόφωνο και ειδικότερα απέναντι στο ραδιοφωνικό σταθμό yeyeradio. Η παρούσα διπλωματική εργασία μπορεί να κατανοηθεί πιο ολοκληρωμένα σε συνδυασμό με την διπλωματική εργασία με τον τίτλο «Αρχική διερεύνηση και υλοποίηση διαδικτυακού ραδιοφωνικού σταθμού» της Κατερίνα Τσίμπου.
description: The aim of the present thesis was the study of marketing growth strategies that are being used by an average web radio station and more specific by the experimental web radio station “yeyeradio” and the final evaluation of the web radio station “yeyeradio”. In the first part it is being studied the marketing techniques that web radio stations use in general and afterwards the way that “yeyeradio” is being promoted. In the second part, it is being described the research that was launched during the time that yeyeradio was broadcasting and the results of the research. The main research question that the researchers called to answer was “what is the opinion of the listeners for the web radio and more importantly for the web radio station yeyeradio?”. The present thesis can be more comprehensible if it is being studied in combination with the study “Initial examination and implementation of a web radio station” by Katerina Tsimpou.
Microwave response of thin niobium films under perpendicular static magnetic fields
Creators: name: Janjusevic, D.
name: Grbic, M. S.
name: Pozek, M.
name: Dulcic, A.
name: Paar, D.
name: Nebendahl, B.
name: Wagner, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The microwave response of high quality niobium films in a perpendicular static magnetic field has been investigated. The complex frequency shift was measured up to the upper critical fields. The data have been analyzed by the effective conductivity model for the type-II superconductors in the mixed state. This model is found to yield consistent results for the coherence lengths in high-kappa superconducting samples, and can be used with HTSC even at temperatures much below T_c. It is shown that for samples with high values of depinning frequency, one should measure both components of the complex frequency shift in order to determine the flow resistivity. The thick Nb film (160 nm) has low resistivity at 10 K, comparable to the best single crystals, and low kappa value. In contrast, the thinnest (10 nm) film has kappa ~ 9.5 and exhibits a high depinning frequency (~20 GHz). The upper critical field determined from microwave measurements is related to the radius of nonoverlaping vortices, and appears to be larger than the one determined by the transition to the normal state.
description: 8 pages, 7 figures; submitted to PRB; measured rho_n; changes due to the referees' comments (abstract, conclusions, extended introduction)
Μοντελοποίηση δυναμικού συστημάτων με δεδομένη συνεχή συμπεριφορά:
Creators: name: Μούρα, Ελευθερία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Πολυωνυμικός πίνακας
Σύστημα αλγεβρικών-διαφορικών εξισώσεων
Σύστημα αλγεβρικών εξισώσεων και εξισώσεων διαφορών
Polynomial matrix
System of algebraic-differential equations
System of algebraic equation and difference equations

description: Η παρούσα εργασία χωρίζεται σε δύο μέρη. Συγκεκριμένα, στο πρώτο μέρος μελετάται ο συνεχής χώρος λύσεων (αντίστοιχα διακριτός χώρος λύσεων) του ομογενούς συστήματος των αλγεβρικών και διαφορικών εξισώσεων της μορφής Α(ρ)β(t)=0, όπου ρ:=d/dt (αντίστοιχα του ομογενούς συστήματος των αλγεβρικών εξισώσεων και εξισώσεων διαφορών της μορφής Α(σ)β(k)=0 όπου σβ(k)=β(k+1)). Ο χώρος λύσεων και στις δύο περιπτώσεις δίνεται σε σχέση με τα πεπερασμένα ζεύγη Jordan των αντίστοιχων πολυωνυμικών πινάκων, για τα οποία γίνεται εκτενής αναφορά του τρόπου με τον οποίο τα κατασκευάζουμε. Στο δεύτερο μέρος μελετάται το ‘αντίστροφο’ πρόβλημα, γνωρίζοντας την ομαλή συμπεριφορά του ομογενούς συστήματος δηλαδή το χώρο λύσεων αυτού, να βρεθεί το σύστημα των αλγεβρικών και διαφορικών εξισώσεων (αντίστοιχα των αλγεβρικών εξισώσεων και εξισώσεων διαφορών) το οποίο παράγει τον συγκεκριμένο χώρο λύσεων.
description: The present paper is divided into two parts. More precisely, the first part study the smooth solution space of the homogenous system of algebraic and differential equations A(ρ)β(t)=0 where ρ:=d/dt (the homogenous system of algebraic and difference equations Α(σ)β(k)=0 where σβ(k)=β(k+1) respectively). The solution space in both cases is given in terms of the finite Jordan pairs of the polynomial matrix A(ρ) for which there is an extensive reference for the way we construct these pairs. The second part is about the ‘inverse’ problem, knowing the smooth behavior of the homogenous system that is the system’s solution space, try to find out the system of algebraic and differential equations (algebraic equations and difference equations respectively) which generates the specific solution space.
Αναζήτηση πολιτισμικών στοιχείων στο εγχειρίδιο γαλλικής γλώσσας Α’ γυμνασίου Action.fr-gr.
Creators: name: Μιχαηλίδου, Κερασούλα Ευαγγέλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Πολιτισμικά στοιχεία
Εγχειρίδια
Γαλλική γλώσσα
Cultural elements
Teaching material
French language

description: Στην παρούσα εργασία επιχειρείται η αναζήτηση πολιτισμικών στοιχείων στο εγχειρίδιο Ά γυμνασίου Action.fr-gr καθώς η ύπαρξη αυτών αποτελεί το ζητούμενο στην διδακτική των γλωσσών για την βέλτιστη εκμάθησή τους. Πέρα από τα γλωσσολογικά στοιχεία, συντακτικά και γραμματικά, απαραίτητη κρίνεται η εξοικείωση των μαθητών με τα κοινωνιολογικά στοιχεία της γλώσσας και ιδιαίτερα με αυτά που προωθούν τις διαπολιτισμικές δεξιότητες των χρηστών της. Τα αυθεντικά κείμενα όπως ο δημοσιογραφικός λόγος, ο λόγος της διαφήμισης αλλά και η σημειωτική προσέγγιση που ακολουθούν τις σύγχρονες παιδαγωγικές αρχές της αυτό-αξιολόγησης και των νέων τεχνολογιών στάθηκαν οι άξονες στην έρευνά μας.
description: In the current paper, a research was implemented to a new teaching material “Action.fr-gr”, in order to verify the presence of cultural elements which are essential in teaching of foreign languages. Apart from the linguistic elements that are related to grammatical and syntactic rules, there is also a wide variety of elements which consist the sociological frame for language use. These elements develop cross-cultural skills as a means of understanding among students. The journalistic discourse, along with the advertising one, but also the semiotic dimension that follow the modern pedagogical approaches of self-assessment and technological advances in the field have framed our study.
On principal hook length partitions and durfee sizes in skew characters
Creators: name: Gutschwager, Christian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 05E05, 05E10, 14M15, 20C30

description: In this paper we construct for a given arbitrary skew diagram A all partitions nu with maximal principal hook lengths among all partitions with the character [nu] appearing in the skew character [A]. Furthermore we show that these are also partitions with minimal Durfee size. This we use to give the maximal Durfee size for [nu] appearing in [A] for the cases when A decays into two partitions and for some special cases of A. Also this gives conditions for two skew diagrams to represent the same skew character.
description: 13 pages, minor changes from v1 to v2 as suggested by the referee, to appear in Annals. Comb
Magneto-Rotational Transport in the Early Sun
Creators: name: Menou, Kristen
name: LeMer, Joel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Angular momentum transport must have occurred in the Sun's radiative zone to explain its current solid body rotation. We survey the stability of the early Sun's radiative zone with respect to diffusive rotational instabilities, for a variety of plausible past configurations. We find that the (faster rotating) early Sun was prone to rotational instabilities even if only weak levels of radial differential rotation were present, while the current Sun is not. Stability domains are determined by approximate balance between dynamical and diffusive timescales, allowing generalizations to other stellar contexts. Depending on the strength and geometry of the weak magnetic field present, the fastest growing unstable mode can be hydrodynamic or magneto-hydrodynamic (MHD) in nature. Our results suggest that diffusive MHD modes may be more efficient at transporting angular momentum than their hydrodynamic (``Goldreich-Schubert-Fricke'') counterparts because the minimum spatial scale required for magnetic tension to be destabilizing limits the otherwise very small scales favored by double-diffusive instabilities. Diffusive magneto-rotational instabilities are thus attractive candidates for angular momentum transport in the early Sun's radiative zone.
description: 23 pages, 4 figures, accepted for publication in ApJ
Vrengt: A Shared Body-Machine Instrument for Music-Dance Performance
Creators: name: Erdem, Cagri
name: Schia, Katja Henriksen
name: Jensenius, Alexander Refsum
Publisher: name: arXiv
Year: 2020
Subjects: subject: Sound (cs.SD)
subject: Human-Computer Interaction (cs.HC)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: H.5.5

description: This paper describes the process of developing a shared instrument for music-dance performance, with a particular focus on exploring the boundaries between standstill vs motion, and silence vs sound. The piece Vrengt grew from the idea of enabling a true partnership between a musician and a dancer, developing an instrument that would allow for active co-performance. Using a participatory design approach, we worked with sonification as a tool for systematically exploring the dancer's bodily expressions. The exploration used a "spatiotemporal matrix", with a particular focus on sonic microinteraction. In the final performance, two Myo armbands were used for capturing muscle activity of the arm and leg of the dancer, together with a wireless headset microphone capturing the sound of breathing. In the paper we reflect on multi-user instrument paradigms, discuss our approach to creating a shared instrument using sonification as a tool for the sound design, and reflect on the performers' subjective evaluation of the instrument.
description: Proceedings of the International Conference on New Interfaces for Musical Expression, 2019
Dynamics of Majority Rule on Hypergraphs
Creators: name: Noonan, James
name: Lambiotte, Renaud
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: A broad range of dynamical systems involve multi-body interactions, or group interactions, which may not be encoded in traditional graphical structures. In this work, we focus on a canonical example from opinion dynamics, the Majority Rule, and investigate the possibility to represent and analyse the system by means of hypergraphs. We explore the formation of consensus and restrict our attention to interaction groups of size $3$, in order to simplify our analysis from a combinatorial perspective. We propose different types of hypergraph models, incorporating modular structure or degree heterogeneity, and recast the dynamics in terms of Fokker-Planck equations, which allows us to predict the transient dynamics toward consensus. Numerical simulations show a very good agreement between the stochastic dynamics and theoretical predictions for large population sizes.
description: 15 pages, 8 figures
THE GENERALIZED ALGORITHM FOR FRACTIONAL CONTINUITY OF POLYNOMIAL SPLINES
Creators: name: SHAHZAD ALI
name: MUHAMMAD ASGHAR
name: GHULAM MUSTAFA
name: FAHEEM KHAN
Publisher: name: Zenodo
Year: 2024
Subjects: Fractional Continuity; Splines; Caputo Derivative; Fractional Calculus.

description: Abstract

Spline is a collection of mathematical functions is used to draw smooth curves through a set of points. Splines have applications in computer graphics, image processing, robotics, planning, and data interpolation. Fractional continuity is a mathematical and computer-graphics term that enhances the concept of continuity in curve and surface modeling. In this paper, the concept of fractional order continuity of generalized spline functions, an interpolating continuity class , is presented, which gives visually piece wise smooth curves. Firstly the general algorithm for generalized polynomial splines is presented, after that it elaborate with different degree of splines. The special cases of the proposed work are also presented. The Caputo left hand and right hand fractional derivative are used in proposed algorithm. The curve produced by proposed algorithm are also control with the help of shape parameters u and v.

AMS Subject Classifications: 26A33, 65D07, 26A15, 26B05.
Topological aspects of graphene: Dirac fermions and the bulk-edge correspondence in magnetic fields
Creators: name: Hatsugai, Y.
name: Fukui, T.
name: Aoki, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss topological aspects of electronic properties of graphene, including edge effects, with the tight-binding model on a honeycomb lattice and its extensions to show the following: (i) Appearance of the pairn of massless Dirac dispersions, which is the origin of anomalous properties including a peculiar quantum Hall effect (QHE), is not accidental to honeycomb, but is rather generic for a class of two-dimensional lattices that interpolate between square and $π$-flux lattices. Persistence of the peculiar QHE is interpreted as a topological stability. (ii) While we have the massless Dirac dispersion only around E=0, the anomalous QHE associated with the Dirac cone unexpectedly persists for a wide range of the chemical potential. The range is bounded by van Hove singularities, at which we predict a transition to the ordinary fermion behavior acompanied by huge jumps in the QHE with a sign change. (iii) For edges we establish a coincidence between the quantum Hall effect in the bulk and the quantum Hall effect for the edge states, which is a manifestation of the topological bulk-edge correspondence. We have also explicitly shown that the E=0 edge states in honeycomb in zero magnetic field persist in magnetic field.
description: 8 pages, 5 figures, proceeding of the graphene conference at MPIPKS Dresden, Sep. 25-Oct.1, 2006
The Sami Galaxy Survey: stellar populations of passive spiral galaxies in different environment
Creators: name: Pak, Mina
name: Oh, Sree
name: Lee, Joon Hyeop
name: Scott, Nicholas
name: Smith, Rory
name: van de Sande, Jesse
name: Croom, Scott M.
name: D'Eugenio, Francesco
name: Bekki, Kenji
name: Brough, Sarah
name: Foster, Caroline
name: Barone, Tania M.
name: Kraljic, Katarina
name: Jeong, Hyunjin
name: Bland-Hawthorn, Joss
name: Bryant, Julia J.
name: Goodwin, Michael
name: Lawrence, Jon
name: Owers, Matt S.
name: Richards, Samuel N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the stellar populations of passive spiral galaxies as a function of mass and environment, using integral field spectroscopy data from the Sydney-AAO Multi-object Integral field spectrograph Galaxy Survey. Our sample consists of $52$ cluster passive spirals and $18$ group/field passive spirals, as well as a set of S0s used as a control sample. The age and [Z/H] estimated by measuring Lick absorption line strength indices both at the center and within $1R_{\rm e}$ do not show a significant difference between the cluster and the field/group passive spirals. However, the field/group passive spirals with log(M$_\star$/M$_\odot)\gtrsim10.5$ show decreasing [$α$/Fe] along with stellar mass, which is $\sim0.1$ dex smaller than that of the cluster passive spirals. We also compare the stellar populations of passive spirals with S0s. In the clusters, we find that passive spirals show slightly younger age and lower [$α$/Fe] than the S0s over the whole mass range. In the field/group, stellar populations show a similar trend between passive spirals and S0s. In particular, [$α$/Fe] of the field/group S0s tend to be flattening with increasing mass above log(M$_\star$/M$_\odot)\gtrsim10.5$, similar to the field/group passive spirals. We relate the age and [$α$/Fe] of passive spirals to their mean infall time in phase-space; we find a positive correlation, in agreement with the prediction of numerical simulations. We discuss the environmental processes that can explain the observed trends. The results lead us to conclude that the formation of the passive spirals and their transformation into S0s may significantly depend on their environments.
description: 13 pages, 12 figures, 1 table, accepted for publication in ApJ
title: Migration pattern of Atlantic wolffish (Anarhichas lupus L.) in Iceland using Data Storage Tags
Creators: name: Gunnarsson, Ásgeir
name: Guðbjörnsson, Sigmar
name: Þorsteinsson, Vilhjálmur
name: Pampoulie, Christophe
Publisher: name: ASC 2013 - Theme session O
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author. From 1966 to 1975 the Marine Institute in Reykjavik (MRI) tagged nearly 13,000 Atlantic wolffish with athena tags. The results demonstrated the location of the main spawning area and patterns of feeding migration of Atlantic wolffish at West Iceland (Fig. 1). In August the Atlantic wolffish migrate from its feeding grounds to deeper water where its spawning grounds are located and in January it migrates back to its shallow-water feeding grounds (Jónsson, 1982).
Semi-empirical models of spicule from inversion of Ca II 8542 Å line
Creators: name: Kuridze, D.
name: Socas-Navarro, H.
name: Koza, J.
name: Oliver, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study a solar spicule observed off-limb using high-resolution imaging spectroscopy in the Ca II 8542 Å line obtained with the CRisp Imaging SpectroPolarimeter (CRISP) on the Swedish 1-m Solar Telescope. Using a new version of the non-LTE code NICOLE specifically developed for this problem we invert the spicule single- and double-peak line profiles. This new version considers off-limb geometry and computes atomic populations by solving the 1D radiative transfer assuming a vertical stratification. The inversion proceeds by fitting the observed spectral profiles at 14 different heights with synthetic profiles computed in the model by solving the radiative transfer problem along its length. Motivated by the appearance of double-peak Ca II 8542 Å spicule profiles, which exhibit two distinct emission features well separated in wavelength, we adopt a double-component scenario. We start from the ansatz that the spicule parameters are practically constant along the spicule axis for each component, except for a density drop. Our results support this ansatz by attaining very good fits to the entire set of 14$\times$4 profiles (14 heights and 4 times). We show that the double-component model with uniform temperature of 9560 K, exponential decrease of density with a height scale of $1000-2000$ km, and the counter-oriented line-of-sight velocities of components reproduce the double-peak line profiles at all spicule segments well. Analyses of the numerical response function reveals the necessity of the inversions of spectra at multiple height positions to obtain height-dependent, degeneracy-free reliable model with a limited number of free parameters.
description: 17 pages, 8 figures, accepted in ApJ
title: Atlas of Icelandic cod spawning sites
Creators: name: Butler, W.
name: Taylor, L.
name: Sólmundsson, J.
name: Marteinsdottir, G.
Publisher: name: ASC 2013 - Theme session O
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author. The main spawning grounds for Icelandic cod (Gadus morhua) are located along the southwest coast, however the small scale structure within this area is not well documented and recent research has identified other areas contributing to the pelagic juvenile population (Marteinsdottir et al, 2000). By examining the distribution of fisheries targeting spawning cod and confirmed spawning cod samples collected by the Marine Research Institute, we address the following questions: 1. How do the spatial distributions of demersal trawl and gillnet differ during the spawning season? 2. Is there a small scale structure withtin the southwest spawning grounds? 3. What is the relative contribution of other areas to the spawning population?
A High Precision Time Measurement Method Based on Frequency-domain Phase-Fitting for Nuclear Pulse Detection
Creators: name: Wang, Jianjun
name: Bu, Zhaohui
name: Wang, Zhao
name: Xu, Jincheng
name: Zhou, Liguo
name: Zheng, Qibin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: This paper proposes a high-precision time measurement method based on digital frequency-domain phase-fitting (DFPF) by using the digitized nuclear pulses. The averaging effect inherent in the frequency-domain cross-correlation and phase-fitting processes effectively minimizes measurement errors, thereby ensuring high precision and resolution in time interval measurements. In this paper, the theory of this DFPF-based time measurement method is analyzed, and an electronics prototype is designed to validate the feasibility of the proposed method by utilizing ADCs for pulse digitization and an FPGA for phase fitting implementation. The test results indicate that, under ideal conditions with a signal-to-noise ratio (SNR) of 64 dB, this method achieves time measurement precisions of 50 ps, 18 ps, and 2.9 ps RMS, corresponding to different Gaussian pulse widths and sampling rates of 118 ns at 40 MSPS, 10 ns at 100 MSPS, and 3 ns at 500 MSPS, respectively. The precision improves with increasing pulse bandwidth. Furthermore, in practical cosmic ray tests, the method achieved favorable timing performance with a precision of 1.7 ns RMS. These results demonstrate that this proposed method has the potential to be a high-precision time measurement for particle detection and is equally applicable to other advanced time measurement scenarios.
description: IEEE Transactions on Nuclear Science, 2025