cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Calculating event-triggered average synaptic conductances from the membrane potential
Creators: name: Pospischil, Martin
name: Piwkowska, Zuzanna
name: Rudolph, Michelle
name: Bal, Thierry
name: Destexhe, Alain
Publisher: name: arXiv
Year: 2006
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: The optimal patterns of synaptic conductances for spike generation in central neurons is a subject of considerable interest. Ideally, such conductance time courses should be extracted from membrane potential (Vm) activity, but this is difficult because the nonlinear contribution of conductances to the Vm renders their estimation from the membrane equation extremely sensitive. We outline here a solution to this problem based on a discretization of the time axis. This procedure can extract the time course of excitatory and inhibitory conductances solely from the analysis of Vm activity. We test this method by calculating spike-triggered averages of synaptic conductances using numerical simulations of the integrate-and-fire model subject to colored conductance noise. The procedure was also tested successfully in biological cortical neurons using conductance noise injected with dynamic-clamp. This method should allow the extraction of synaptic conductances from Vm recordings in vivo.
description: 10 pages, 8 figures; final version published in the Journal of Neurophysiology
Development of a Turbulent Outflow During Electron-Positron Magnetic Reconnection
Creators: name: Swisdak, M.
name: Liu, Y. H.
name: Drake, J. F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The mass symmetry between the two species in electron-positron (pair) plasmas has interesting consequences for collisionless magnetic reconnection because the Hall term, which plays a crucial role in supporting fast reconnection in electron-proton plasmas, vanishes. We perform kinetic simulations of pair reconnection in systems of various sizes, show that it remains fast, and identify the reason why this occurs. For sufficiently large systems a Weibel-like temperature anisotropy instability develops in the outflow from the X-point that causes the current layer to broaden and form a Petschek-like open outflow. We discuss the parameter regimes in which pair reconnection should be fast and the implications for astrophysical pair plasmas.
description: Accepted by ApJ
Early Developmental Trajectories of Functional Connectivity along the Visual Pathways in Rhesus Monkeys
Creators: name: Bachevalier, J.
name: Pincus, M.
name: Morin, E.
name: Li, L.
name: Fair, D.
name: Sanchez, M.
name: Maltbie, E.
name: Earl, E.
name: Styner, M.
name: Feczko, E.
name: Steele, J.
name: Howell, B.
name: Kovacs-Balint, Z.
name: Miranda-Dominguez, O.
Publisher: name: Oxford University Press
Year: 2019

description: Early social interactions shape the development of social behavior, although the critical periods or the underlying neurodevelopmental processes are not completely understood. Here, we studied the developmental changes in neural pathways underlying visual social engagement in the translational rhesus monkey model. Changes in functional connectivity (FC) along the ventral object and motion pathways and the dorsal attention/visuo-spatial pathways were studied longitudinally using resting-state functional MRI in infant rhesus monkeys, from birth through early weaning (3 months), given the socioemotional changes experienced during this period. Our results revealed that (1) maturation along the visual pathways proceeds in a caudo-rostral progression with primary visual areas (V1-V3) showing strong FC as early as 2 weeks of age, whereas higher-order visual and attentional areas (e.g., MT-AST, LIP-FEF) show weak FC; (2) functional changes were pathway-specific (e.g., robust FC increases detected in the most anterior aspect of the object pathway (TE-AMY), but FC remained weak in the other pathways (e.g., AST-AMY)); (3) FC matures similarly in both right and left hemispheres. Our findings suggest that visual pathways in infant macaques undergo selective remodeling during the first 3 months of life, likely regulated by early social interactions and supporting the transition to independence from the mother.
Magnetic Anisotropy of Deposited Transition Metal Clusters
Creators: name: Bornemann, S.
name: Minár, J.
name: Staunton, J. B.
name: Honolka, J.
name: Enders, A.
name: Kern, K.
name: Ebert, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present results of magnetic torque calculations using the fully relativistic spin-polarized Korringa-Kohn-Rostoker approach applied to small Co and Fe clusters deposited on the Pt(111) surface. From the magnetic torque one can derive among others the magnetic anisotropy energy (MAE). It was found that this approach is numerically much more stable and also computationally less demanding than using the magnetic force theorem that allows to calculate the MAE directly. Although structural relaxation effects were not included our results correspond reasonably well to recent experimental data.
description: Submitted to European Physical Journal D, special issue Cluster at Surfaces
Four-loop moments of the heavy quark vacuum polarization function in perturbative QCD
Creators: name: Chetyrkin, K. G.
name: Kühn, J. H.
name: Sturm, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: New results at four-loop order in perturbative QCD for the first two Taylor coefficients of the heavy quark vacuum polarization function are presented. They can be used to perform a precise determination of the charm- and bottom-quark mass. Implications for the value of the quark masses are briefly discussed.
description: 8 pages, 13 figures; final version accepted for publication in the journal
6j-symbols, hyperbolic structures and the Volume Conjecture
Creators: name: Costantino, Francesco
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 57M27, 57M50

description: We compute the asymptotical growth rate of a large family of $U_q(sl_2)$ $6j$-symbols and we interpret our results in geometric terms by relating them to volumes of hyperbolic truncated tetrahedra. We address a question which is strictly related with S.Gukov's generalized volume conjecture and deals with the case of hyperbolic links in connected sums of $S^2\times S^1$. We answer this question for the infinite family of fundamental shadow links.
description: 17 pages, 3 figures. Published on Geometry & Topology 11 (2007)
Minkowski's Object: A Starburst Triggered by a Radio Jet, Revisited
Creators: name: Croft, Steve
name: van Breugel, Wil
name: de Vries, Wim
name: Dopita, Mike
name: Martin, Chris
name: Morganti, Raffaella
name: Neff, Susan
name: Oosterloo, Tom
name: Schiminovich, David
name: Stanford, S. A.
name: van Gorkum, Jacqueline
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present neutral hydrogen, ultraviolet, optical and near-infrared imaging, and optical spectroscopy, of Minkowski's Object (MO), a star forming peculiar galaxy near NGC 541. The observations strengthen evidence that star formation in MO was triggered by the radio jet from NGC 541. Key new results are the discovery of a 4.9E8 solar mass double HI cloud straddling the radio jet downstream from MO, where the jet changes direction and decollimates; strong detections of MO, also showing double structure, in UV and H-alpha; and numerous HII regions and associated clusters in MO. In UV, MO resembles the radio-aligned, rest-frame UV morphologies in many high redshift radio galaxies (HzRGs), also thought to be caused by jet-induced star formation. MO's stellar population is dominated by a 7.5 Myr-old, 1.9E7 solar mass instantaneous burst, with current star formation rate 0.52 solar masses per year (concentrated upstream from where the HI column density is high). This is unlike the jet-induced star formation in Centaurus A, where the jet interacts with pre-existing cold gas; in MO the HI may have cooled out of a warmer, clumpy intergalactic or interstellar medium as a result of jet interaction, followed by collapse of the cooling clouds and subsequent star formation (consistent with numerical simulations). Since the radio source that triggered star formation in MO is much less luminous, and therefore more common, than powerful HzRGs, and because the environment around MO is not particularly special in terms of abundant dense, cold gas, jet-induced star formation in the early universe might be even more prevalent than previously thought.
description: 52 pages, 15 figures, accepted for publication in ApJ
Is co-existence and/or containment of genetically modified plants possible, and is it important?
Creators: name: Caradus, John
Publisher: name: AgResearch
Year: 2025
Subjects: classificationCode: 3105
subject: Genetics
subject: FOS: Biological sciences

description: Co-existence and containment of genetically modified (GM) plants has been a contentious issue since GM technologies were first commercially released in the mid-1990s. In the first decade of commercial GM plant use, there were a significant number of contamination incidents resulting from GM presence in non-GM crops and seed, some with a significant financial penalty. However, these types of incidents seem to be less frequent in recent times. Co-existence regulations and guidance have been developed in many countries and can occur with appropriate planning and communication within farming communities. This appears to be working effectively since countries with the largest areas devoted to organic agriculture also have amongst the highest land area used for GM crops. Strategies for effective co-existence include both on-farm management decisions and downstream segregation during processing of products, including seed for sowing in the supply chain. Co-existence on-farm is important and is reliant on agronomic strategies such as planting times, crop placement, separation distances and physical containment to limit pollen dispersal and seed movement, which could be assisted by using biological/molecular containment through genetic manipulation to disrupt the pollination and fertilisation process. Co-existence of GM and non-GM crops has been and is possible.
Ομάδες εκπαιδευτικού περιεχομένου στο Facebook: Αντιλήψεις και πρακτικές εκπαιδευτικών ΠΕ
Creators: name: Αραβανή, Βαρβάρα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πρακτικές
Συμμετοχή
Επαγγελματική ανάπτυξη
Facebook
Practices
Participation
Professional development

description: Σκοπός της παρούσας έρευνας είναι η διερεύνηση των απόψεων και των πρακτικών των εκπαιδευτικών Πρωτοβάθμιας Εκπαίδευσης που αναπτύσσουν κατά τη συμμετοχή τους σε ομάδες εκπαιδευτικού χαρακτήρα στο Facebook και της σχέσης των πρακτικών αυτών με την επαγγελματική τους ανάπτυξη. Σχεδιάστηκε και πραγματοποιήθηκε μια μελέτη βασισμένη στη διεξαγωγή ατομικών ημιδομημένων συνεντεύξεων. Η έρευνα πραγματοποιήθηκε το ακαδημαϊκό έτος 2017-2018 και συγκεκριμένα στις αρχές του 2018. Συμμετείχαν 19 εκπαιδευτικοί που υπηρετούν στην Πρωτοβάθμια Εκπαίδευση. Συντάχθηκε οδηγός συνέντευξης που περιελάμβανε 3 άξονες: 1) κοινωνικο-δημογραφικά στοιχεία του δείγματος, 2) πρακτικές συμμετοχής που αναπτύσσουν και 3) αντιλαμβανόμενη χρησιμότητα της συμμετοχής. Σύμφωνα με τα αποτελέσματα που προέκυψαν οι εκπαιδευτικοί συμμετέχουν με διάφορους τρόπους στις ομάδες αυτές - δημοσιεύουν, διαβάζουν αναρτήσεις, σχολιάζουν. Κύρια προσδοκία όλων είναι ο διαμοιρασμός υλικού παιδαγωγικού περιεχομένου που θα αποτελέσει βοήθεια στη διδασκαλία και σε δεύτερη φάση η ενημέρωση για θέματα που απασχολούν τον εκπαιδευτικό κόσμο. Οι εκπαιδευτικοί που πήραν μέρος στην παρούσα έρευνα θεωρούν ότι η συμμετοχή σε ομάδες εκπαιδευτικού περιεχομένου στο Facebook δύναται να αποτελέσει παράγοντα επαγγελματικής ανάπτυξης καθώς τους βοηθάει να έρχονται σε επαφή με παιδαγωγικά εργαλεία και να αλληλεπιδρούν με συναδέλφισσες-ους που θα ήταν πρακτικά αδύνατο να συναντήσουν λόγω γεωγραφικών αποστάσεων.
description: The purpose of this research is to investigate the views and practices of the Primary Education Teachers which are developed through their participation in educational groups on Facebook and how these practices are related to their professional development. A study based on individual semi-structured interviews was designed and conducted. The survey was conducted in the academic year 2017-2018, in particular at the beginning of 2018. 19 Primary Education teachers took part in the survey. An interview guide was compiled that contained 3 axis: 1) socio-demographic data of the sample, 2) participation practices developed and 3) perceived usefulness of participation. According to the results obtained, the teachers participate in various ways in these groups - they publish, read posts, comment. The main expectation of all is the sharing of pedagogical content material that will help teaching and secondly providing information on issues that concern the educational world. Teachers who took part in this research believe that participation in Facebook educational content groups can constitute a factor in professional development by helping them get in touch with pedagogical tools and interact with colleagues who would be virtually impossible to meet due to geographical distances
A self-tuning mechanism in (3+p)d gravity-scalar theory
Creators: name: Park, Eun Kyung
name: Kwon, Pyung Seong
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a new type of self-tuning mechanism for ($3+p$)d brane world models in the framework of gravity-scalar theory. This new type of self-tuning mechanism exhibits a remarkable feature. In the limit $g_s \to 0$, $g_s$ being the string coupling, the geometry of bulk spacetime remains virtually unchanged by an introduction of the Standard Model(SM)-brane, and consequently it is virtually unaffected by quantum fluctuations of SM fields with support on the SM-brane. Such a feature can be obtained by introducing Neveu-Schwarz(NS)-brane as a background brane on which our SM-brane is to be set. Indeed, field equations naturally suggest the existence of the background NS-brane. Among the given such models, of the most interest is the case with $Λ=0$, where $Λ$ represents the bulk cosmological constant. This model contains a pair of coincident branes (of the SM- and the NS-branes), one of which is a codimension-2 brane placed at the origin of 2d transverse space ($\equiv Σ_2$), another a codimension-1 brane placed at the edge of $Σ_2$. These two branes are (anti) T-duals of each other, and one of them may be identified as our SM-brane plus the background NS-brane. In the presence of the background NS-brane (and in the absence of $Λ$), the 2d transverse space $Σ_2$ becomes an orbifold $R_2 /Z_n$ with an appropriate deficit angle. But this is only possible if the ($3+p$)d Planck scale $M_{3+p}$ and the string scale $M_s$($\equiv 1/\sqrt{α^{\prime}}$) are of the same order, which accords with the hierarchy assumption \cite{1,2,3} that the electroweak scale $m_{EW}$ is the only short distance scale existing in nature.
Transitions of turbulent superstructures in generalized Kolmogorov flow
Creators: name: Lalescu, Cristian C.
name: Wilczek, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Self-organized large-scale flow structures occur in a wide range of turbulent flows. Yet, their emergence, dynamics, and interplay with small-scale turbulence are not well understood. Here, we investigate such self-organized turbulent superstructures in three-dimensional turbulent Kolmogorov flow with large-scale drag. Through extensive simulations, we uncover their low-dimensional dynamics featuring transitions between several stable and meta-stable large-scale structures as a function of the damping parameter. The main dissipation mechanism for the turbulent superstructures is the generation of small-scale turbulence, whose local structure depends strongly on the large-scale flow. Our results elucidate the generic emergence and low-dimensional dynamics of large-scale flow structures in fully developed turbulence and reveal a strong coupling of large- and small-scale flow features.
description: v2: Revised manuscript
Anatomic consideration of pedicle screw placement in the thoracic spine, comparison between Roy-Camille technique and Funnel technique
Creators: name: Charoenchai Ussawakongkiat
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2002
Subjects: pedicle, thoracic spine

description: 1, 9, Journal of Medicine and Health Sciences
Confirmation of the Y(4260) Resonance Production in ISR
Creators: name: He, Q.
name: Collaboration, CLEO
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 13.3 fb^-1 of e+e- collision data taken in the Upsilon(1S-4S) region with the CLEO III detector at the CESR collider, a search has been made for the new resonance Y(4260) recently reported by the BaBar Collaboration. The production of Y(4260) in initial state radiation (ISR), and its decay into pi+pi-J/psi are confirmed. A good quality fit to our data is obtained with a single resonance. We determine M(Y(4260))=(4284+17-16(stat)+-4(syst)) MeV/c^2, Gamma(Y(4260))=(73+39-25(stat)+-5(syst)) MeV/c^2, and Gamma_ee(Y(4260))xBr(Y(4260)->pi+pi-J/psi)=(8.9+3.9-3.1(stat)+-1.9(syst)) eV/c^2.
description: 8 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD (Rapid Comm.)
Postnatal Zika virus infection is associated with persistent abnormalities in brain structure, function, and behavior in infant macaques
Creators: name: Avanzato, V.
name: Habib, J.
name: Kovacs-Balint, Z.
name: Chahroudi, A.
name: Suthar, M.S.
name: Mavigner, M.
name: Earl, E.
name: Styner, M.
name: Mattingly, C.
name: McDonald, C.E.
name: Vanderford, T.H.
name: Fair, D.
name: Burke, M.W.
name: Alvarado, M.C.
name: Bailey, V.K.
name: Sanchez, M.M.
name: Jean, S.M.
name: Feczko, E.
name: Cohen, J.K.
name: Raper, J.
name: O'Neal, J.T.
name: Watkins, D.I.
name: O'Connor, D.H.
name: Zhang, X.
name: Wrammert, J.
name: Paul Johnson, R.
name: Gumber, S.
name: Silvestri, G.
name: Magnani, D.M.
name: Bhaumik, S.K.
Publisher: name: American Association for the Advancement of Science
Year: 2018

description: The Zika virus (ZIKV) epidemic is associated with fetal brain lesions and other serious birth defects classified as congenital ZIKV syndrome. Postnatal ZIKV infection in infants and children has been reported; however, data on brain anatomy, function, and behavioral outcomes following infection are absent. We show that postnatal ZIKV infection of infant rhesus macaques (RMs) results in persistent structural and functional alterations of the central nervous system compared to age-matched controls. We demonstrate ZIKV lymphoid tropism and neurotropism in infant RMs and histopathologic abnormalities in the peripheral and central nervous systems including inflammatory infiltrates, astrogliosis, and Wallerian degeneration. Structural and resting-state functional magnetic resonance imaging (MRI/rs-fMRI) show persistent enlargement of lateral ventricles, maturational changes in specific brain regions, and altered functional connectivity (FC) between brain areas involved in emotional behavior and arousal functions, including weakened amygdala-hippocampal connectivity in two of two ZIKV-infected infant RMs several months after clearance of ZIKV RNA from peripheral blood. ZIKV infection also results in distinct alterations in the species-typical emotional reactivity to acute stress, which were predicted by the weak amygdala-hippocampal FC. We demonstrate that postnatal ZIKV infection of infants in this model affects neurodevelopment, suggesting that long-term clinical monitoring of pediatric cases is warranted.
Objective Evaluation of Multiple Sclerosis Lesion Segmentation using a Data Management and Processing Infrastructure
Creators: name: Glatard, T.
name: Roura, E.
name: Vukusic, S.
name: Khademi, A.
name: Mahbod, A.
name: Dojat, M.
name: Wang, C.
name: Santos, W.P.
name: Doyle, S.
name: Malpica, N.
name: McKinley, R.
name: Valverde, S.
name: Tourdias, T.
name: Commowick, O.
name: Leray, F.
name: Sweeney, E.
name: Girard, P.
name: Santos, M.M.
name: Cabezas, M.
name: Cervenansky, F.
name: Kain, M.
name: Guttmann, C.
name: Styner, M.
name: Ferré, J.-C.
name: Vera-Olmos, F.J.
name: Kerbrat, A.
name: Edan, G.
name: Bloch, I.
name: Wagner, F.
name: Tomas-Fernandez, X.
name: Simon, M.
name: Knight, J.
name: Warfield, S.K.
name: Lladó, X.
name: Muschelli, J.
name: Améli, R.
name: Beaumont, J.
name: Cotton, F.
name: Forbes, F.
name: Pop, S.C.
name: Istace, A.
name: Laurent, B.
name: Barillot, C.
name: Urien, H.
name: Silva-Filho, A.G.
Publisher: name: Nature Publishing Group
Year: 2018

description: We present a study of multiple sclerosis segmentation algorithms conducted at the international MICCAI 2016 challenge. This challenge was operated using a new open-science computing infrastructure. This allowed for the automatic and independent evaluation of a large range of algorithms in a fair and completely automatic manner. This computing infrastructure was used to evaluate thirteen methods of MS lesions segmentation, exploring a broad range of state-of-theart algorithms, against a high-quality database of 53 MS cases coming from four centers following a common definition of the acquisition protocol. Each case was annotated manually by an unprecedented number of seven different experts. Results of the challenge highlighted that automatic algorithms, including the recent machine learning methods (random forests, deep learning, …), are still trailing human expertise on both detection and delineation criteria. In addition, we demonstrate that computing a statistically robust consensus of the algorithms performs closer to human expertise on one score (segmentation) although still trailing on detection scores.
Η θέση του ανακριτή στην ποινική δίκη: δικαιοπολιτικές κρίσεις και σύγχρονοι προβληματισμοί
Creators: name: Λότσιος, Θωμάς Στέργιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανακριτής
Εισαγγελέας
Διεύρυνση της δίωξης
Investigator Judge
Public Prosecutor
Enlargement of the Prosecution

description: Σκοπός της παρούσας εργασίας είναι να καταδείξει την παρουσία του ανακριτή στο ελληνικό ποινικοδικονομικό δίκαιο, να εκθέσει παλαιότερες προβληματικές και να καταδείξει σύγχρονα προβλήματα του θεσμού στο σημερινό νομοθετικό πλαίσιο. Για να μπορέσει αυτό να γίνει πραγματικότητα, παρουσιάζονται ιστορικά οι πηγές του θεσμού μέσα σε μία προσπάθεια κατανόησης του λόγου ανάγκης ύπαρξής του και την ιστορική του σχέση με το άλλο θεμελιώδες μονοπρόσωπο όργανο του ποινικού συστήματος, τον εισαγγελέα. Γίνεται μία προσπάθεια οριοθέτησης των εξουσιών τους όχι μόνο μέσα στο αυστηρά καθορισμένο νομοθετικό πλαίσιο αλλά και μέσα από τη de facto άσκηση των εξουσιών που τους χορηγεί ο νόμος
description: The aim of the present thesis is to show the presence of the investigator judge in the greek criminal jurisdiction, to present past problems and to show contemporary problems of the institution in the current legislative framework. In order for this to become a reality, the sources of the institution are historically presented in an attempt to understand the necessity of its existence and its historical relationship with the other fundamental single organ of the criminal system, the public prosecutor. An attempt is made to demarcate their powers not only within the strictly defined legislative framework but also through the de facto exercise of the powers conferred on them by the law
Κυκλική οικονομία και τουρισμός
Creators: name: Μαυρουδής, Αθανάσιος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: subject: Τουρισμός
subject: Κυκλική οικονομία
subject: Οικολογικές σημάνσεις
subject: Tourism
subject: FOS: Economics and business
subject: Circular economy
subject: Ecolabel

description: Σκοπός της παρούσας Διπλωματικής Εργασίας είναι να μελετήσει την Κυκλική Οικονομία και πως αυτή μπορεί να εφαρμοσθεί στον τομέα του τουρισμού. Η μελέτη επικεντρώνεται στην εφαρμογή των αρχών της Κυκλικής Οικονομίας στον κλάδο των τουριστικών καταλυμάτων. Αναλύονται οι υφιστάμενοι δείκτες κυκλικότητας και προτείνεται η δημιουργία νέων δεικτών. Με στόχο τον υπολογισμό του βαθμού εξοικείωσης των τουριστικών καταλυμάτων με τις οικολογικές πρακτικές για την μετάβαση στο μοντέλο της κυκλικής οικονομίας μελετήθηκε η υιοθέτηση οικολογικών σημάνσεων από τα τουριστικά καταλύματα της Περιφερειακής Ενότητας Χαλκιδικής και της Μητροπολιτικής Περιοχή Θεσσαλονίκης για τον Ιανουάριο 2018
description: The aim of the present Master Thesis dissertation is the study of the Circular Economy and how it can be applied in the tourism sector. The study focuses on how the principles of Circular Economy can be applied on the tourist accommodation sector. The existing circularity indicators are presented and new indicators are proposed. In order to evaluate the degree of familiarity of tourist accommodation units with ecolabels best practices for the transition towards Circular Economy the possession of ecolabels in tourist accommodation sector has been examined in the Regional Unit of Chalkidiki and the Metropolitan Area of Thessaloniki during January 2018
Near-Field Radiative Heat Transfer Eigenmodes
Creators: name: Sanders, Stephen
name: Zundel, Lauren
name: Kort-Kamp, Wilton J. M.
name: Dalvit, Diego A. R.
name: Manjavacas, Alejandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The near-field electromagnetic interaction between nanoscale objects produces enhanced radiative heat transfer that can greatly surpass the limits established by far-field black-body radiation. Here, we present a theoretical framework to describe the temporal dynamics of the radiative heat transfer in ensembles of nanostructures, which is based on the use of an eigenmode expansion of the equations that govern this process. Using this formalism, we identify the fundamental principles that determine the thermalization of collections of nanostructures, revealing general but often unintuitive dynamics. Our results provide an elegant and precise approach to efficiently analyze the temporal dynamics of the near-field radiative heat transfer in systems containing a large number of nanoparticles.
description: 10 pages, 7 figures
The Kohn-Luttinger Effect in Gauge Theories
Creators: name: Schaefer, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Kohn and Luttinger showed that a many body system of fermions interacting via short range forces becomes superfluid even if the interaction is repulsive in all partial waves. In gauge theories such as QCD the interaction between fermions is long range and the assumptions of Kohn and Luttinger are not satisfied. We show that in a U(1) gauge theory the Kohn-Luttinger phenomenon does not take place. In QCD attractive channels always exist, but there are cases in which the primary pairing channel leaves some fermions ungapped. As an example we consider the unpaired fermion in the 2SC phase of QCD with two flavors. We show that it acquires a very small gap via a mechanism analogous to the Kohn-Luttinger effect. The gap is too small to be phenomenologically relevant.
description: 5 pages, 2 figure, minor revisions, to appear in PRD
Hippocampal shape and volume changes with antipsychotics in early stage psychotic illness
Creators: name: Wang, L.
name: Barch, D.
name: Styner, M.
name: Lieberman, J.A.
name: Mamah, D.
name: Harms, M.P.
Publisher: name: Frontiers Media S.A.
Year: 2012

description: Progression of hippocampal shape and volume abnormalities has been described in psychotic disorders such as schizophrenia. However it is unclear how specific antipsychotic medications influence the development of hippocampal structure.We conducted a longitudinal, randomized, controlled, multisite, double-blind study involving 14 academic medical centers (United States 11, Canada 1, Netherlands 1, and England 1). One hundred thirty-four first-episode psychosis patients (receiving either haloperidol [HAL] or olanzapine [OLZ]) and 51 healthy controls were followed for up to 104 weeks using magnetic resonance imaging and large-deformation high-dimensional brain mapping of the hippocampus. Changes in hippocampal volume and shape metrics (i.e., percentage of negative surface vertex slopes, and surface deformation) were evaluated. Mixed-models analysis did not show a significant group-by-time interaction for hippocampal volume. However, the cumulative distribution function of hippocampal surface vertex slopes showed a notable left shift with HAL treatment compared to OLZ treatment and tocontrols. OLZ treatment was associated with a significantly lower percentage of "large magnitude" negative surface vertex slopes compared to HAL treatment (p = 0.004). Surface deformation maps however did not localize any hippocampal regions that differentially contracted over time with OLZ treatment, after FDR correction. These results indicate that surface analysis provides supplementary information to volumetry in detecting differential treatment effects of the hippocampus. Our results suggest that OLZ is associated with less longitudinal hippocampal surface deformation than HAL, however the hippocampal regions affected appear to be variable across patients.
Rebuttal to Hasan and Pedraza in comments and controversies: "Improving the reliability of manual and automated methods for hippocampal and amygdala volume measurements"
Creators: name: Wagner II, H.R.
name: Lewis, D.V.
name: Petty, C.M.
name: LaBar, K.S.
name: Morey, R.A.
name: Xu, Y.
name: Hayes, J.P.
name: Styner, M.
name: McCarthy, G.
Publisher: name: Academic Press Inc.
Year: 2009

description: Here we address the critiques offered by Hasan and Pedraza to our recently published manuscript comparing the performance of two automated segmentation programs, FSL/FIRST and FreeSurfer (Morey R, Petty C, Xu Y, Pannu Hayes J, Wagner H, Lewis D, LaBar K, Styner M, McCarthy G. (2009): A comparison of automated segmentation and manual tracing for quantifying of hippocampal and amygdala volumes. Neuroimage 45:855-866). We provide an assessment and discussion of their specific critiques. Hasan and Pedraza bring up some important points concerning our omission of sample demographic features and inclusion of left and right hemisphere volumes as independent measures in correlational analyses. We present additional data on demographic attributes of our sample and correlations analyzed separately on left and right hemispheres of the amygdala and hippocampus. While their commentary aids the reader to more critically asses our study, it falls short of substantiating that our omissions ought to lead readers to significantly revise their interpretations. Further research will help to disentangle the advantages and limitations of the various freely-available automated segmentation software packages.
Bharati Mukherjee's Wife: A Study of Dimple's Psychic Turmoil
Creators: name: Patel, Rakesh
Publisher: name: Zenodo
Year: 2012
Subjects: Bharati Mukherjee
Bharati Mukherjee's novel Wife
Indian English Literature
Indian English Novel
Indian Writing in English

description: Bharati Mukherjee's novel "Wife" deals with the theme of migration, a diasporas movement of Dimple and her husband from their homewards India into a new region the USA. The novel depicts the deleterious cultural effects of colonialism, and the cultural displacement or cultural shock resulting from biculturalism or multiculturalism that make the people migrate.
title: Κέντρο επιμόρφωσης στις παραδοσιακές τέχνες στην Παλμύρα της Συρίας
title: Learning and training centre of traditional arts in Palmyra, Syria
Creators: name: Τσαγκαρη Δημητρα
name: Aldabet Hosam
Publisher: name: Technical University of Crete
Year: 2020

description: Η πρόταση εστιάζει στον επανασχεδιασμό σε τμήμα του νότιου αστικού ορίου της πόλης της Ταντμορ στη Συρία, εκεί όπου συναντάται η πόλη με την αρχαία Παλμύρα αλλά και την όαση. Σε αυτό το χώρο βρίσκεται και το αρχαιολογικό μουσείο. Τόσο η σύγχρονη όσο και η αρχαία πόλη έχουν υποστεί ζημιές κατά τη διάρκεια του πολέμου. Με δεδομένο ότι το μουσείο θα αποκατασταθεί στην αρχική του κατάσταση, σχεδιάζεται ο χώρος γύρω από αυτό και προστίθεται ένα ακόμη κτίριο όπου θα στεγάζεται επιμορφωτικό κέντρο για παραδοσιακές τέχνες με στόχο την στήριξη και άμεση επαγγελματική αποκατάσταση ατόμων που πλήχθηκαν τα τελευταία χρόνια. Η τοποθεσία και ο σχεδιασμός επιτρέπουν στο μέλλον την αξιοποίηση κάποιων χώρων για την αποκατάσταση αρχαιοτήτων.
Nearly hyperuniform, nonhyperuniform, and antihyperuniform density fluctuations in two-dimensional transition metal dichalcogenides with defects
Creators: name: Chen, Duyu
name: Zheng, Yu
name: Lee, Chia-Hao
name: Kang, Sangmin
name: Zhu, Wenjuan
name: Zhuang, Houlong
name: Huang, Pinshane Y.
name: Jiao, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Hyperuniform many-body systems in $d$-dimensional Euclidean space are characterized by completely suppressed (normalized) infinite-wavelength density fluctuations, and appear to be endowed with novel exotic physical properties. In this work, we analyze the effects of localized defects on the density fluctuations across length scales and on the hyperuniformity property of experimental samples of two-dimensional transition metal dichalcogenides. In particular, we extract atomic coordinates from time series annular dark field-scanning transmission electron microscopy imaging data of 2D tungsten chalcogenides with the 2H structure showing continuous development and evolution of electron-beam induced defects, and construct the corresponding chemical-bonding informed coordination networks between the atoms. We then compute a variety of pair statistics and bond-orientational statistics to characterize the samples. At low defect concentrations, the corresponding materials are nearly hyperuniform. As more defects are introduced, the (approximate) hyperuniformity of the materials is gradually destroyed, and the system becomes non-hyperuniform even when the material still contains a significant amount of crystalline regions. At high defect concentrations, the structures become antihyperuniform with diverging (normalized) large-scale density fluctuations. Overall, the defected materials possess varying degrees of orientation order, and there is apparently no intermediate hexatic phase emerging. We also construct a minimalist structural model and demonstrate that the experimental samples can be essentially viewed as perturbed honeycomb crystals with small correlated displacements and double chalcogen vacancies.
Huge tunnelling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions
Creators: name: Giddings, A. D.
name: Makarovsky, O. N.
name: Khalid, M. N.
name: Yasin, S.
name: Edmonds, K. W.
name: Campion, R. P.
name: Wunderlich, J.
name: Jungwirth, T.
name: Williams, D. A.
name: Gallagher, B. L.
name: Foxon, C. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report large anisotropic magnetoresistance (AMR) behaviours in single lateral (Ga,Mn)As nanoconstriction of up to 1300%, along with large multistable telegraphic switching. The nanoconstriction devices are fabricated using high-resolution electron beam lithography of a 5 nm thick (Ga,Mn)As epilayer. The unusual behaviour exhibited by these devices is discussed in the context of existing theories for enhanced AMR ferromagnetic semiconductor nanoscale devices, particularly with regard to the dependence on the magnetotransport of the bulk material. We conclude that our results are most consistent with the Coulomb blockade AMR mechanism.
description: 10 pages, 5 figures
Complex pathways and memory in compressed corrugated sheets
Creators: name: Bense, Hadrien
name: van Hecke, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The nonlinear response of driven complex materials -- disordered magnets, amorphous media, crumpled sheets -- features intricate transition pathways where the system repeatedly hops between metastable states. % which encode memory effects. Such pathways encode memory effects and may allow information processing -- yet tools are lacking to experimentally observe and control these pathways, and their full breadth has not been explored. Here we introduce compression of corrugated elastic sheets to precisely observe and manipulate {their full}, multi-step pathways, which are reproducible, robust,and controlled by geometry. We show how manipulation of the boundaries allows to elicit multiple targeted pathways from a single sample. In all cases, each state in the pathway can be encoded by the binary state of material 'bits' called hysterons, and the strength of their interactions plays a crucial role. In particular, as function of increasing interaction strength, we observe Preisach pathways, expected in systems of independently switching hysterons, 'scrambled' pathways that evidence hitherto unexplored interactions between these material bits, and 'accumulator' pathways which leverage these interactions to perform an elementary computation. Our work opens a route to probe, manipulate and understand complex pathways, impacting future applications in soft robotics and information processing in materials.
Interferometric multi-wavelength (sub)millimeter continuum study of the young high-mass protocluster IRAS05358+3543
Creators: name: Beuther, H.
name: Leurini, S.
name: Schilke, P.
name: Wyrowski, F.
name: Menten, K. M.
name: Zhang, Q.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The young massive star-forming region IRAS05358+3543 was observed at high-spatial resolution in the continuum emission at 3.1 and 1.2mm with the Plateau de Bure Interferometer, and at 875 and 438mum with the Submillimeter Array. We resolve at least four continuum sub-sources that are likely of protostellar nature. Two of them are potentially part of a proto-binary system with a projected separation of 1700AU. Additional (sub)mm continuum peaks are not necessarily harboring protostars but maybe caused by the multiple molecular outflows. The spectral energy distributions (SEDs) of the sub-sources show several features. The main power house mm1, which is associated with CH3OH maser emission, a hypercompact HII region and a mid-infrared source, exhibits a typical SED with a free-free emission component at cm and long mm wavelengths and a cold dust component in the (sub)mm part of the spectrum (spectral index between 1.2mm and 438mum alpha~3.6). The free-free emission corresponds to a Lyman continuum flux of an embedded 13Msun B1 star. The coldest source of the region, mm3, has alpha~3.7 between 1.2mm and 875mum, but has lower than expected fluxes in the shorter wavelength 438mum band. This turnover of the Planck-function sets an upper limit on the dust temperature of mm3 of approximately 20K. The uv-data analysis of the density structure of individual sub-cores reveals distributions with power-law indices between 1.5 and 2. This resembles the density distributions of the larger-scale cluster-forming clump as well as those from typical low-mass cores.
description: 13 pages, 7 figures, accepted for Astronomy and Astrophysics, a high-resolution version of the paper is also available at http://www.mpia.de/homes/beuther/papers.html
Nonlinear Observers Design for Vision-Aided Inertial Navigation Systems
Creators: name: Wang, Miaomiao
name: Berkane, Soulaimane
name: Tayebi, Abdelhamid
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper deals with the simultaneous estimation of the attitude, position and linear velocity for vision-aided inertial navigation systems. We propose a nonlinear observer on $SO(3)\times \mathbb{R}^{15}$ relying on body-frame acceleration, angular velocity and (stereo or monocular) bearing measurements of some landmarks that are constant and known in the inertial frame. Unlike the existing local Kalman-type observers, our proposed nonlinear observer guarantees almost global asymptotic stability and local exponential stability. A detailed uniform observability analysis has been conducted and sufficient conditions are derived. Moreover, a hybrid version of the proposed observer is provided to handle the intermittent nature of the measurements in practical applications. Simulation and experimental results are provided to illustrate the effectiveness of the proposed state observer.
description: Accepted for publication in IEEE Transaction on Automatic Control. 16 pages, 6 figures
Distributions Method in Nonstationary Boundary Value Problems for Wave Equations
Creators: name: Alexeyeva, Lyudmila A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35L15

description: The classical wave equation in the space of generalized functions (distributions)is considered. The Distributions Method of building the solutions of nonstationary boundary value problems (NBVP) for wave equations in coordinates spaces of different dimensions is elaborated. Dynamic analogues of Green and Gauss formulas for solutions of wave equation in the distributions space are built. Their regular integral representations and singular boundary integral equations for solving the nonstationary problems are constructed for the coordinates spaces of the 1,2,3-dimensions. The method of obtaining of conditions on shock waves fronts is stated. The theorem on the single solution of NBVP is proved, including shock waves.
description: 19 pages, in Russian
Quantized and unquantized zero-bias tunneling conductance peaks in Majorana nanowires: Conductance below and above $ 2e^2/h $
Creators: name: Pan, Haining
name: Liu, Chun-Xiao
name: Wimmer, Michael
name: Sarma, Sankar Das
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Majorana zero modes can appear at the wire ends of a 1D topological superconductor and manifest themselves as a quantized zero-bias conductance peak in the tunneling spectroscopy of normal-superconductor junctions. However, in superconductor-semiconductor hybrid nanowires, zero-bias conductance peaks may arise owing to topologically trivial mechanisms as well, mimicking the Majorana-induced topological peak in many aspects. In this work, we systematically investigate the characteristics of zero-bias conductance peaks for topological Majorana bound states, trivial quasi-Majorana bound states and low-energy Andreev bound states arising from smooth potential variations, and disorder-induced subgap bound states. Our focus is on the conductance peak value (i.e., equal to, greater than, or less than $2e^2/h$), as well as the robustness (plateau- or spike-like) against the tuning parameters (e.g., the magnetic field and tunneling gate voltage) for zero-bias peaks arising from the different mechanisms. We find that for Majoranas and quasi-Majoranas, the zero-bias peak values are no more than $2e^2/h$, and a quantized conductance plateau forms generically as a function of parameters. By contrast, for conductance peaks due to low-energy Andreev bound states or disorder-induced bound states, the peak values may exceed $2e^2/h$, and a conductance plateau is rarely observed unless through careful postselection and fine-tuning. Our findings should shed light on the interpretation of experimental measurements on the tunneling spectroscopy of normal-superconductor junctions of hybrid Majorana nanowires.
description: 16 pages, 10 figures
Η λειτουργία των υποκατάστατων οργάνων ως απόκλιση από την αρχή της συλλογικής δράσης της διοίκησης στην ανώνυμη εταιρία
Creators: name: Τζελίδη, Αλεξάνδρα Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Υποκατάστατο όργανο
Διοικητικό Συμβούλιο
Συλλογική δράση
Substitute body
Board of directors
Collective action

description: Σκοπός της παρούσης διπλωματικής εργασίας ήταν ο τρόπος λειτουργίας των υποκατάστατων ή υποδεέστερων οργάνων στην διοίκηση της ανώνυμης εταιρίας. Ειδικότερα, στην αρχή της εργασίας προσδιορίσαμε την έννοια των υποκατάστατων οργάνων και ακόμη την έννομη σχέση που έχουν τα διοικητικά αυτά όργανα με την εταιρία. Στη συνέχεια, αναλύσαμε τις προϋποθέσεις διορισμού τους, την έκταση των εξουσιών τους, όπως επίσης και την παράλληλη αρμοδιότητα που διατηρεί το διοικητικό συμβούλιο. Επιπλέον, έγινε αναλυτική αναφορά στην διάκριση των υποκαταστάτων από τους πληρεξουσίους και στις διαφορές που υπάρχουν μεταξύ τους κυρίως ως προς την έκταση της εξουσίας τους, τον τρόπο διορισμού τους και την ευθύνη τους. Ένα άλλο ζήτημα που θίξαμε ήταν οι περιορισμοί των υποκατάστατων στην άσκηση της διαχειριστικής και εκπροσωπευτικής τους εξουσίας και αν οι σχετικοί κανόνες που ισχύουν για τα μέλη του διοικητικού συμβουλίου ισχύουν και για αυτούς. Ακόμη, αναλύθηκε εκτενώς η ευθύνη τους τόσο έναντι της εταιρίας όσο και έναντι των μετόχων ενώ παράλληλα ασχοληθήκαμε με την ευθύνη που έχει το διοικητικό συμβούλιο για τον διορισμό των οργάνων αυτών σε περίπτωση κακής διαχείρισης. Τέλος, εξετάσαμε την περίπτωση ανάκλησης τους και την διάρκεια της θητείας τους
description: The aim of the present thesis was the way with which substitute or subordinate bodies operate in the management of the public limited company. In particular, in the beginning of the thesis we defined the meaning of substitutes and also the legal relation which these administrative bodies have with the company. Afterwards, we analyzed the prerequisites of their appointment, the extent of their powers and also the concurrent power the board maintain. In addition, we made a detailed reference to the distinction of substitutes by the proxies and the differences between them, mainly regarding the extent of their power, the way they are appointed and their responsibility. Another issue we raised was the limitations of substitutes in the exercise of their managerial and representative power and whether the relevant rules applicable to the members of the board of directors are also applied to them. Furthermore, we analyzed extensively their liability both to the company and shareholders, while we have also dealt with the responsibility of the board of directors for the appointment of these bodies in case of maladministration. Finally, we examined the case of their withdrawal and the duration of their term