cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Disentangling the effects of ocean transport, temperature and food concentration on the distribution of fish larvae
Creators: name: Stige, Leif Chr.
name: Langangen, Øystein
name: Yaragina, Natalia A.
name: Vikebø, Frode B.
name: Gusdal, Yvonne
name: Bogstad, Bjarte
name: Melsom, Arne
name: Stenseth, Nils Chr.
name: Hjermann, Dag Ø.
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. The causes of the large interannual fluctuations in the recruitment to many marine fishes remain incompletely understood. Two complementary approaches to studying these causes are coupled physical-biological modelling of the behaviour and drift of the early life stages of the fish, and statistical modelling of the observed spatial and temporal variation in their abundances in relation to environmental factors. By combining these approaches, the effect of variable drift can be accounted for in the statistical modelling, allowing for increased statistical power to detect effects of covariates such as temperature and zooplankton abundance. We here show the results of such combined modelling approaches for studying the spatiotemporal distribution of larval Northeast Arctic cod, Gadus morhua. A coupled physical-biological model is used to simulate the transport and development of cod eggs and larvae from spring to summer. The predictions from this model are used as input in a statistical analysis of the summer data, to investigate effects of covariates thought to be linked to survival. The results shed new light on the roles of temperature and zooplankton in the early life stages of cod.
Συνόρθωση υψομετρικού δικτύου με δεδομένα gps, χωροστάθμησης και βαρύτητας:
Creators: name: Τσιμερίκας, Αλέξανδρος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Γεωειδές
Συνόρθωση
Υψόμετρα
Geoid
Adjustment
Heights

description: Οι ραγδαίες εξελίξεις στο χώρο του δορυφορικού εντοπισμού θέσης κατέστησαν τις επίγειες μετρήσεις με συστήματα GNSS δυνατές σε πραγματικό χρόνο, πολύ γρήγορες και αποδοτικές, με ενιαία ακρίβεια της τάξης λίγων εκατοστών και κυρίως πολύ οικονομικότερες σε σχέση με τις κλασσικές μεθόδους τοπογραφίας. Οι μετρήσεις των συστημάτων GNSS εμπεριέχουν οριζοντιογραφική αλλά και υψομετρική πληροφορία, καθώς αναφέρονται στο τρισδιάστατο γεωκεντρικό σύστημα αναφοράς WGS84 (φ,λ,h / X,Y,Z). Ενώ η αναγωγή τους σε προβολικές συντεταγμένες είναι ορισμένη μέσω των προβολικών εξισώσεων με πολύ υψηλή ακρίβεια, η συσχέτιση των ελλειψοειδών υψομέτρων με τα ορθομετρικά, τα οποία παραδοσιακά χρησιμοποιούνται λόγω της φυσικής τους σημασίας, είναι μια διαδικασία άμεσα εξαρτημένη από τα υψόμετρα γεωειδούς σε κάθε σημείο μέτρησης αλλά και με πολλά προβλήματα, όπως συστηματικές διαφορές μεταξύ των επιφανειών αναφοράς διαφορετικών υψομέτρων κ.α. Στην παρούσα εργασία επιχειρείται ο προσδιορισμός του βέλτιστου στατιστικά γεωειδούς, μέσω διαδικασίας συνόρθωσης και με την εφαρμογή παραμετρικών μοντέλων, για μια ευρεία περιοχή της Ανατολικής Μακεδονίας και Θράκης με δεδομένα: μετρήσεων GPS (ελλειψοειδή ύψη) σε 28 βάθρα Γ.Υ.Σ., ορθομετρικών υψομέτρων (επίσημες τιμές Γ.Υ.Σ.) και παγκόσμιου και τοπικού μοντέλου γεωειδούς (αποχές γεωειδούς Ν). Το σύνολο των διαθέσιμων δεδομένων καθιστούν τη βασική σχέση των 3 πηγών υψομέτρων h = H+N υπερπροσδιορισμένη.
description: Rapid developments in satellite positioning made the ground measurements with GNSS systems possible in real time, very quick and efficient, with uniform accuracy of order a few cm and above all more cost effective than the traditional methods of surveying. Measurements of GNSS systems include horizontal and altitude information and refer in three-dimensional geocentric reference system WGS84 (φ, λ, h / X, Y, Z). While the transformation in planar coordinates are defined by the projection equations with very high precision, the correlation of the ellipsoidal heights with orthometric heights, which are traditionally used because of their physical significance, is a process directly dependent on the geoid heights at each measurement point but with many problems such as systematic differences between vertical datum surfaces, etc. This paper attempts to determine, in terms of statistics, the optimal geoid through least squares adjustment process and the implementation of parametric models for a wide area of Eastern Macedonia and Thrace with data consisting of GPS measurements (ellipsoidal heights) in 28 trigonometric benchmarks, orthometric heights (as given by THE HELLENIC MILITARY GEOGRAPHICAL SERVICE -HMGS) and global and local geoid models (geoid heights). The three sources of the available data make the basic relationship of heights h = H+N overdetermined.
Defect states and their electric field-enhanced electron thermal emission in heavily Zr-doped beta-Ga2O3 crystals
Creators: name: Sun, Rujun
name: Ooi, Yu Kee
name: Bhattacharyya, Arkka
name: Saleh, Muad
name: Krishnamoorthy, Sriram
name: Lynn, Kelvin G.
name: Scarpulla, Michael A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Performing deep level transient spectroscopy (DLTS) on Schottky diodes, we investigated defect levels below the conduction band minima (Ec) in Czochralski (CZ) grown unintentionally-doped (UID) and vertical gradient freeze (VGF)-grown Zr-doped beta-Ga2O3 crystals. In UID crystals with an electron concentration of 10^17 cm-3, we observe levels at 0.18 eV and 0.46 eV in addition to the previously reported 0.86 (E2) and 1.03 eV (E3) levels. For 10^18 cm-3 Zr-doped Ga2O3, signatures at 0.30 eV (E15) and 0.71 eV (E16) are present. For the highest Zr doping of 5*10^18 cm-3, we observe only one signature at 0.59 eV. Electric field-enhanced emission rates are demonstrated via increasing the reverse bias during measurement. The 0.86 eV signature in the UID sample displays phonon-assisted tunneling enhanced thermal emission and is consistent with the widely reported E2 (FeGa) defect. The 0.71 eV (E16) signature in the lower-Zr-doped crystal also exhibits phonon-assisted tunneling emission enhancement. Taking into account that the high doping in the Zr-doped diodes also increases the electric field, we propose that the 0.59 eV signature in the highest Zr-doped sample likely corresponds to the 0.71 eV signature in lower-doped samples. Our analysis highlights the importance of testing for and reporting on field-enhanced emission especially the electric field present during DLTS and other characterization experiments on beta-Ga2O3 along with the standard emission energy, cross-section, and lambda-corrected trap density. This is important because of the intended use of beta-Ga2O3 in high-field devices and the many orders of magnitude of possible doping.
description: 18 pages, 3 figures
title: Spatial ecosystem dynamics in a changing environment: overview from the Barents Sea
Creators: name: Howell, Daniel
name: Filin, Anatoly
name: Eriksen, Elena
name: Bogstad, Bjarte
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. The arctic Barents Sea is one of the Large Marine Ecosystems that is most sensitive to changing climate, and one where relatively small externally derived environmental changes can have large impacts on the spatial structure of the ecosystem. Furthermore, the Barents Sea is home to large stocks of gadoids and forage fish, supporting extensive commercial fisheries. As a result there exists an extensive time series of fisheries and ecosystem datasets, giving a detailed knowledge base with which to examine these changes. This presentation therefore presents an overview of some of the cases where changing environmental conditions are currently, or may soon be, changing the structure (especially the spatial structure) and hence the functioning of different components of the ecosystem. Examples presented cover predators, forage fish and plankton, and their interactions. The implications of these changes for current assessment and management procedures are highlighted and discussed
New X-ray detections of known Wolf-Rayet stars
Creators: name: Naze, Yael
name: Gosset, Eric
name: Marechal, Quentin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Using XMM-Newton, we undertook a dedicated project to search for X-ray bright wind-wind collisions in 18 WR+OB systems. We complemented these observations with Swift and Chandra datasets, allowing for the study of two additional systems. We also improved the ephemerides, for these systems displaying photometric changes, using TESS, Kepler, and ASAS-SN data. Five systems displayed a very faint X-ray emission ($\log [L_{\rm X}/L_{\rm BOL}]
description: accepted by MNRAS - the arxiv version has figures in low-resolution
Representations of Surface Groups and Right-Angled Artin Groups in Higher Rank
Creators: name: Wang, Stephen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Group Theory (math.GR)
subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F36; 53C35

description: We give very flexible, concrete constructions of discrete and faithful epresentations of right-angled Artin groups into higher-rank Lie groups. Using the geometry of the associated symmetric spaces and the combinatorics of the groups, we find a general criterion for when discrete and faithful representations exist, and show that the criterion is satisfied in particular cases. There are direct applications towards constructing representations of surface groups into higher-rank Lie groups, and, in particular, into lattices in higher-rank Lie groups.
description: 17 pages, 2 figures
title: Influence of climate and environmental forcing on ecosystem structure in northeast Pacific systems
Creators: name: Baker, Matthew R.
name: Hollowed, Anne B.
name: Branch, Trevor A.
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. Abundance and distributions of marine species vary across time and space, reflecting biological interactions, environmental forcing, and external perturbation. Understanding the relative influence of these various drivers requires integrating community ecology with ecosystem approaches, which consider habitat, environmental gradients, climate variability and change. We use time series data on species abundance and environmental conditions in northeast Pacific systems to explore physicalbiological linkages underlying ecosystem structure and function, as well as the mechanisms driving stability and change over time. We classify species to diet-based functional guilds and explore the extent to which species within and between guilds exhibit common responses to environmental variables. We also distinguish distinct environmental thresholds for individual species, quantify how habitat variables influence the structuring of biological communities, and examine how trends in climate might influence shifts in community composition, range, and species dominance. Patterns suggest that habitat constraints and environmental thresholds influence guilds in distinct ways. Despite distinctions in physical and biological structure across systems, we note common trends in species dynamics within functional guilds, providing insight to common patterns and potential responses to climate change in these systems.
Διερεύνηση της δομής και των ιδιοτήτων μεταλλικών επικαλύψεων που αναπτύσσονται με την τεχνική εναπόθεσης κόνεως:
Creators: name: Σταθοκωστόπουλος, Δημήτριος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Μεταλλικές επικαλύψεις
χημική εναπόθεση κόνεως
Περίθλαση ακτίνων-X
Metallic coatings
Pack cementation
X-ray diffraction

description: Στην παρούσα εργασία έγινε προσπάθεια κατασκευής μιας διάταξης η οποία εφαρμόζει την μέθοδο CVD (chemical vapor deposition) και ειδικότερα αυτής του Pack Cementation. Η διάταξη που κατασκευάστηκε στο εργαστήριο έχει χαμηλό κόστος κατασκευής, ευκολία λειτουργίας και είναι φιλική προς το περιβάλλον. Η μέθοδος του Pack Cementation μπορεί να εφαρμοστεί για πολλές περιπτώσεις μεταλλικών επικαλύψεων ανθεκτικές στην οξείδωση. Οι δημιουργούμενες με την μέθοδο αυτή επικαλύψεις που πραγματοποιήθηκαν στα πλαίσια της παρούσης εργασίας, εμφανίζουν ικανοποιητικό πάχος και είναι δυνατό να αποτελούνται από μία ή περισσότερες φάσεις (διακριτές στρώσεις), διαβρώνονται σε μικρότερο βαθμό από το υπόστρωμα προστατεύοντας το σημαντικά από την έκθεση του σε οξειδωτικά περιβάλλοντα υψηλών θερμοκρασιών. Οι επικαλύψεις που αναπτύχθηκαν εν συνέχεια οξειδώθηκαν υπό ακραίες θερμοκρασιακές συνθήκες και τα αποτελέσματα καταγράφηκαν και επεξεργάστηκαν εκτενώς.
description: In the present study the fabrication of a CVD (Chemical Vapor Deposition) device, in particular using the Pack Cementation method, was attempted. The device, that was finally manufactured in the lab, has a low set up cost, is easy to handle and friendly to the environment. The Pack Cementation method can be applied in many cases of metal coatings, which are resistant to oxidation. A number of coatings were made using the experimental device. These coating exhibit a satisfactory thickness and could include several layer phases. Corroded at a smaller degree than the substrate, they substantially protect it at high temperature environment. The next stage of the study was the oxidation of the coatings at adverse temperature conditions. The results were recorded and extensively worked out.
Η Εκκλησία της Ελλάδας στο έπος του 1940 και την Εθνική Αντίσταση
Creators: name: Τζιαφάς,
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Εκκλησία
Β' Παγκόσμιος Πόλεμος
Άγιο Όρος
Church
Second World War
Saint Mountain Athos

description: Through the nagonation of the subject there is an attempt to give the necessary features of the Church’ s and the states co-walk during epic 40’w period. All the Glergy as one, archbishops and metropolitans as well as the seclusion both of monasteries offered the maximum to the Greek people.
description: Η προσφορά της Εκκλησίας στο έπος του σαράντα και στην εθνική αντίσταση, υπήρξε αρκετά σημαντική. Σύσσωμος ο κλήρος και οι ιερές μονές πρόσφεραν τα μέγιστα για να απαλύνουν τον πόνο των ανθρώπων και να τονίσουν το ηθικό των ελλήνων στρατιωτών. Οι αρχιεπίσκοποι Αθηνών τόσο ο Χρύσανθος Φιλιππίδης όσο και ο Δαμασκηνός Παπανδρέου εργάστηκαν άοκνα για το καλό της πατρίδας επιδεικνύοντας σημαντικό έργο και στον κοινωνικό τομέα. Επίσης τα παραδείγματα των απλών κληρικών που έδωσαν όλο τον εαυτό τους στον αγώνα είναι πολυάριθμα.
Gravitational Wave Constraints on Multi-Brane Inflation
Creators: name: Huston, Ian
name: Lidsey, James E.
name: Thomas, Steven
name: Ward, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound speed of the fluctuations in the inflaton field. Included in this class of models is the effective action for multiple coincident branes in the finite n limit. The action for this configuration is determined using a powerful iterative technique, based upon the fundamental representation of SU(2). In principle the upper bounds on the tensor-scalar ratio that arise in the standard, single-brane DBI inflationary scenario can be relaxed in such multi-brane configurations if a large and detectable non-Gaussianity is generated. Moreover models with a small number of coincident branes could generate a gravitational wave background that will be observable to future experiments.
description: 18 pages, uses iopart.sty; v2: added references, version as published in JCAP
As revistas portuguesas em Acesso Aberto:  uma visão panorâmica
Creators: name: Torres, Maria Filipa
name: Manuel Borges, Maria
name: Duarte, Anabela
Publisher: name: Zenodo
Year: 2024

description: Apresentação realizada na sessão Comunicação I da 15ª Conferência Lusófona de Ciência Aberta, na Escola Superior de Enfermagem do Porto (ESEP), de 01 a 04 de outubro de 2024.
Probes of the quark-gluon plasma and plasma instabilities
Creators: name: Hauksson, Sigtryggur
name: Jeon, Sangyong
name: Gale, Charles
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Penetrating probes in heavy-ion collisions, like jets and photons, are sensitive to the transport coefficients of the produced quark-gluon plasma, such as shear and bulk viscosity. Quantifying this sensitivity requires a detailed understanding of photon emission and jet-medium interaction in a non-equilibrium plasma. Up to now, such an understanding has been hindered by plasma instabilities which arise out of equilibrium and lead to spurious divergences when evaluating the rate of interaction of hard probes with the plasma. In this paper, we show that taking into account the time evolution of an unstable plasma cures these divergences. We calculate the time evolution of gluon two-point correlators in a setup with small initial momentum anisotropy and show that the gluon occupation density grows exponentially at early times. Based on this calculation, we argue for a phenomenological prescription where instability poles are subtracted. Finally, we show that in the Abelian case instability fields do not affect medium-induced photon emission to our order of approximation.
description: 17 pages, 12 figures
title: Hydrographical and biological components of seascape shape mixed assemblages of a meroplankton community
Creators: name: Hidalgo, Manuel
name: Reglero, Patricia
name: Álvarez-Berastegui, Diego
name: Torres, Asvin Perez
name: Álvarez, Itziar
name: Rodriguez, José María
name: Carbonell, Aina
name: Zaragoza, Nuria
name: Tor, Ariadna
name: Goñi, Raquel
name: Mallol, Sandra
name: Balbín, Rosa
name: Alemany, Francisco
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. Studies investigating the environmental influence on the community structure of meroplankton almost always focused on fish larvae. However, to our knowledge, no such study has incorporated information of other important groups of the meroplankton (i.e. decapods and cephalopods) to investigate how hydroclimate shapes the spatiotemporal variability of the whole community. In the present study, we investigate the spatiotemporal dynamics of a summer meroplankton community above the thermocline in the Western Mediterranean. The study compares contrasting years in terms of the hydrographical and the biological components of the pelagic seascape. The methodological approach embraces multivariate statistics to define mixed assemblages of taxa with spatially explicit non-linear regressions to investigate the spatiotemporal dynamics. Our study identifies several recurrent environmental scenarios that are associated to different mixed assemblages of fish and crustacean larvae, among the most relevant: i) Atlantic waters inflow, ii) resident Mediterranean waters, or iii) high productivity at thermocline depth. We discuss both the causes (e.g. adaptive convergence) and the consequences (e.g. primary and secondary trophic interactions) associated to the species co-existence in the more characteristic mixed assemblages identified. This study sheds new light on the complex responses of plankton communities to exogenous drivers under alternating hydroclimatic scenarios.
Automatic Detection and Correction Algorithms for Magnetic Saturation in the SMFT/HSOS longitudinal Magnetograms
Creators: name: Xu, Haiqing
name: Liu, Suo
name: Su, Jiangtao
name: Deng, Yuanyong
name: Plotnikov, Andrei
name: Bai, Xianyong
name: Chen, Jie
name: Yang, Xiao
name: Guo, Jingjing
name: Wang, Xiaofan
name: Song, Yongliang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: longitudinal magnetic field often suffers the saturation effect in strong magnetic field region when the measurement performs in a single-wavelength point and linear calibration is adopted. In this study, we develop a method that can judge the threshold of saturation in Stokes $V/I$ observed by the Solar Magnetic Field Telescope (SMFT) and correct for it automatically. The procedure is that first perform the second-order polynomial fit to the Stokes $V/I$ \textit{vs} $I/I_{m}$ ($I_{m}$ is the maximum value of Stokes $I$) curve to estimate the threshold of saturation, then reconstruct Stokes $V/I$ in strong field region to correct for saturation. The algorithm is proved to be effective by comparing with the magnetograms obtained by the Helioseismic and Magnetic Imager (HMI). The accurate rate of detection and correction for saturation is $\sim$99.4\% and $\sim$88\% respectively among 175 active regions. The advantages and disadvantages of the algorithm are discussed.
description: 13 pages, 8 figures, accepted by RAA
Implications of Canonical Gauge Coupling Unification in High-Scale Supersymmetry Breaking
Creators: name: Barger, V.
name: Deshpande, N. G.
name: Jiang, Jing
name: Langacker, Paul
name: Li, Tianjun
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We systematically construct two kinds of models with canonical gauge coupling unification and universal high-scale supersymmetry breaking. In the first we introduce standard vector-like particles while in the second we also include non-standard vector-like particles. We require that the gauge coupling unification scale is from 5 x 10^{15} GeV to the Planck scale, that the universal supersymmetry breaking scale is from 10 TeV to the unification scale, and that the masses of the vector-like particles (M_V) are universal and in the range from 200 GeV to 1 TeV. Using two-loop renormalization group equation (RGE) running for the gauge couplings and one-loop RGE running for Yukawa couplings and the Higgs quartic coupling, we calculate the supersymmetry breaking scales, the gauge coupling unification scales, and the corresponding Higgs mass ranges. When the vector-like particle masses are less than 1 TeV, these models can be tested at the LHC.
description: 25 pages, 4 figures
Improving Efficiency of Sympathetic Cooling in Atom-Ion and Atom-Atom Confined Collisions
Creators: name: Melezhik, Vladimir S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a new way for sympathetic cooling of ions in an electromagnetic Paul trap: it implies the use for this purpose of cold buffer atoms in the region of atom-ion confinement-induced resonance (CIR). The problem is that the unavoidable micromotion of the ion and the long-range nature of its interaction with the environment of colder atoms in a hybrid atomic-ion trap prevent its sympathetic cooling. We show that the destructive effect of ion micromotion on its sympathetic cooling can however be suppressed in the vicinity of the atom-ion CIR. The origin of this is the "fermionization" of the atom-ion wave function near CIR, where the atom-ion pair behaves as a pair of noninteracting identical fermions. This prevents the complete approach of the atom with the ion near resonance and does not enhance the ion micromotion, which interferes with its sympathetic cooling. We investigate the effect of sympathetic cooling around CIRs in atom-ion and atom-atom confined collisions within the qusiclassical-quantum approach using the Li-Yb$^+$ and Li-Yb confined systems as an example. In this approach, the Schrödinger equation for a cold light atom is integrated simultaneously with the classical Hamilton equations for a hotter heavy ion or atom during collision. We have found the region near the atom-ion CIR where the sympathetic cooling of the ion by cold atoms is possible in a hybrid atom-ion trap. We also show that it is possible to improve the efficiency of sympathetic cooling in atomic traps by using atomic CIRs.
Physical Meaning and Experimental Check of a Variational Principle for Macro-to-Micro Transition
Creators: name: Arminjon, Mayeul
name: Imbault, Didier
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: It is argued that, for strongly non-linear behaviors, a fully deterministic position can hardly be maintained in the micro-macro transitions. This is due to the lack of information on the relevant boundary conditions, and to the tendency of non-linear dynamical systems to have a "horizon of predictibility". In the variational micro-macro model proposed by us, the data of the microscopic behavior plus the overall stimulus has to be supplemented by a "heterogeneity parameter". In this model, the macro-to-micro transition depends on the validity of a "principle of minimal heterogeneity" (PMH). It is shown that the PMH has a close relation to the maximum entropy principle.
Stochastic simulation in dynamic probabilistic networks using compact representation
Creators: name: Cheuk, Adrian Y.W.
Publisher: name: University of British Columbia
Year: 2009

description: In recent years, researchers in the A l domain have used Bayesian belief networks to build models of expert opinion. Though computationally expensive deterministic algorithms have been devised, it has been shown that exact probabilistic inference in belief networks, especially multiply connected ones, is intractable. In view of this, various approximation methods based on stochastic simulation appeared in an attempt to perform efficient approximate inference in large and richly interconnected models. However, due to convergence problems, approximation in dynamic probabilistic networks has seemed unpromising. Reversing arcs into evidence nodes can improve convergence performance in simulation, but the resulting exponential increase in network complexity and, in particular, the size of the conditional probability tables (CPTs) can often render this evidence reversal method computationally inefficient. In this thesis, we describe a structured simulation algorithm that uses the evidence reversal technique based on a tree-structured representation for CPTs. Most real systems exhibit a large amount of local structure. The tree can reduce network complexity by exploiting this structure to keep CPTs in a compact way even after arcs have been reversed. The tree also has a major impact on improving computational efficiency by capturing context-specific independence during simulation. Experimental results show that in general our structured evidence reversal algorithm improves convergence performance significantly while being both spatially and computationally much more efficient than its unstructured counterpart.
MENP: An Open-Source MATLAB Implementation of Multipole Expansion for Applications in Nanophotonics
Creators: name: Hinamoto, Tatsuki
name: Fujii, Minoru
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In modern nanophotonics, multipolar interference plays an indispensable role to realize novel optical devices represented by metasurfaces with unprecedented functionalities. Not only to engineer sub-wavelength structures that constitute such devices but also to realize and interpret unnatural phenomena in nanophotonics, a program that efficiently carries out multipole expansion is highly demanded. MENP is a MATLAB program for computation of multipole contributions to light scattering from current density distributions induced in nanophotonic resonators. The main purpose of MENP is to carry out post-processing of a rigid multipole expansion for full-field simulations which in principle provide the information of all near- and far-field interactions (e.g. as a total scattering cross section). MENP decomposes total scattering cross sections into partial ones due to electric and magnetic dipoles and higher-order terms based on recently developed exact multipole expansion formulas. We validate the program by comparing results for ideal and realistic nanospheres with those obtained with the Mie theory. We also demonstrate the potential of MENP for analysis of anapole states by calculating the multipole expansion under the long-wavelength approximation which enables us to introduce toroidal dipole moments.
description: 12 pages, 4 figures, the program is available from https://github.com/Hinamoooon/MENP
A Phenomenological Theory of The Pseudogap State
Creators: name: Yang, Kai-Yu
name: Rice, T. M.
name: Zhang, Fu-Chun
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: An ansatz is proposed for the coherent part of the single particle Green's function in a doped resonant valence bond (RVB) state by, analogy with the form derived by Konik and coworkers for a doped spin liquid formed by an array of 2-leg Hubbard ladders near half-filling. The parameters of the RVB state are taken from the renormalized mean field theory of Zhang and coworkers for underdoped cuprates. The ansatz shows good agreement with recent angle resolved photoemission (ARPES) on underdoped cuprates and resolves an apparent disagreement with the Luttinger Sum Rule. The transition in the normal state from a doped RVB spin liquid to a standard Landau Fermi liquid, that occurs in the renormalized mean field theory, appears as a quantum critical point characterized by a change in the analytic form of the Green's function. A d-wave superconducting dome surrounding this quantum critical point is introduced phenomenologically. Results are also presented for the Drude weight and tunneling density of states as functions of the hole density.
description: 11 pages, 14 figures
title: Silver hake tracks changes in Northwest Atlantic circulation
Creators: name: Nye, Janet A.
name: Joyce, Terrence
name: Kwon, Young-Oh
name: Link, Jason S.
name: Alade, Larry
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. Recent studies documenting shifts in spatial distribution of many organisms in response to a warming climate highlight the need to understand the mechanisms underlying species distribution at large spatial scales. Previous work documented the remote oceanographic processes governing the spatial distribution of adult silver hake, Merluccius bilinearis, a commercially important fish in the Northeast US shelf region. Changes in spatial distribution of silver hake over the last 40 years are highly correlated with the position of the Gulf Stream (GS). Silver hake shifted their spatial distribution in direct response to local changes in bottom temperature on the continental shelf that are responding to the same large scale circulation change affecting the GS path, namely changes in the Atlantic Meridional Overturning Circulation (AMOC). Further analysis illustrates that other species also respond to this remote forcing, suggesting that the GS position is the best leading indicator of thermal conditions resulting in ecosystem change on the shelf. If AMOC weakens as is suggested by global climate models, silver hake and other species will remain in a poleward position, the extent to which could be forecast at both decadal and multidecadal scales.
Hybrid nature of the abnormal solutions of the Bethe-Salpeter equation in the Wick-Cutkosky model
Creators: name: Carbonell, J.
name: Sazdjian, V. A. Karmanov ans H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the Wick-Cutkosky model, where two scalar massive constituents interact by means of the exchange of a scalar massless particle, the Bethe-Salpeter equation has solutions of two types, called "normal" and "abnormal". In the non-relativistic limit, the normal solutions correspond to the usual Coulomb spectrum, whereas the abnormal ones do not have non-relativistic counterparts -- they are absent in the Schrödinger equation framework. We have studied, in the formalism of the light-front dynamics, the Fock-space content of the abnormal solutions. It turns out that, in contrast to the normal ones, the abnormal states are dominated by the massless exchange particles (by 90 \% or more), what provides a natural explanation of their decoupling from the two-body Schrödinger equation. Assuming that one of the massive constituents is charged, we have calculated the electromagnetic elastic form factors of the normal and abnormal states, as well as the transition form factors. The results on form factors confirm the many-body nature of the abnormal states, as found from the Fock-space analysis. The abnormal solutions have thus properties similar to those of hybrid states, made here essentially of two massive constituents and several or many massless exchange particles. They could also be interpreted as the Abelian scalar analogs of the QCD hybrid states. The question of the validity of the ladder approximation of the model is also examined.
description: 22 pages, 20 figures, 2 tables. Accepted in Eur. Phys. J. C
Overview of multimedia application development
Creators: name: Marple, Kirk Jonathan
Publisher: name: University of British Columbia
Year: 2009

description: This thesis presents a survey of multimedia application development and a case study of an implementation of a multimedia application. The steps of multimedia application development are described including the planning of the application development, content acquisition and storage, arid content delivery. The survey would be useful for multimedia developers and interactive media designers interested in gaining a broad knowledge of multimedia application design. The case study presented is of a networked multimedia playback application and it illustrates the application development steps in the context of the application. The goals of the project were to provide synchronized video playback over a network while leveraging existing technology in order to support extensibility, portability, and interoperability.
Οι Ολυμπιακοί Αγώνες στο ελληνικό παιδικό βιβλίο. Ιδεολογικές κατευθύνσεις και παιδαγωγικές σκοπιμότητες:
Creators: name: Χαρανά, Αθανασία Στεφάνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Ολυμπιακοί Αγώνες
Παιδικό βιβλίο
Ιδεολογικές
Παιδαγωγικές
Olympic Games
Children’s literature
Ideological
Pedagogical

description: Σκοπός της παρούσας διατριβής ήταν η διερεύνηση των ιδεολογικών κατευθύνσεων, που πιθανόν υιοθετούν, και των παιδαγωγικών σκοπιμοτήτων, που πιθανόν εξυπηρετούν, τα λογοτεχνικά κείμενα για παιδιά, των οποίων η θεματογραφία περιστρέφεται γύρω από τους Ολυμπιακούς Αγώνες. Επιλέχθηκαν κείμενα, ελλήνων συγγραφέων, μυθοπλαστικά και μυθοπλαστικά γνώσεων που εκδόθηκαν από το 1996 και εντεύθεν. Παρουσιάσαμε , αναλυτικά, το αξιακό σύστημα των πρώτων και των σύγχρονων Ολυμπιακών Αγώνων. Στη συνέχεια εξετάσθηκαν δομικά στοιχεία της αφήγησης, όπως οι χαρακτήρες, η πλοκή, η οπτική γωνία, η εικονογράφηση και αξιοποιήθηκαν ως προς τις πληροφορίες που παρείχαν: α. για την ανταπόκριση των κειμένων στο αξιακό σύστημα των Ολυμπιακών αγώνων β. για τις ιδεολογικές κατευθύνσεις και τις παιδαγωγικές σκοπιμότητές των κειμένων γ. για την προβολή άλλων αξιών.
description: Goal of the present thesis was to widen the ideological directions that are probably adopted, and the pedagogical feasibility that is probably served, by children's literature about the Olympic Games. We have chosen greek fiction and knowledge fiction literature, published from 1996 and on. We presented in detail the value system of the first as well as the contemporary Olympic Games. Then, fundamental elements of the narration, such as the characters, the plot, the perspective, the picture were examined and utilized, judging from the information they provided: a.) for the relation of the texts to the value system of the Olympic Games, b.) for the ideological directions and the pedagogical feasibility of the texts, c.) for the projection of other values
Adsorption-induced modification of the hot electron lifetime in a Pb/Ag111 quantum well system
Creators: name: Haag, Florian
name: Eul, Tobias
name: Grad, Lisa
name: Haag, Norman
name: Knippertz, Johannes
name: Cinchetti, Mirko
name: Aeschlimann, Martin
name: Stadtmüller, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The interfacial band structures of multilayer systems play a crucial role for the ultrafast charge and spin carrier dynamics at interfaces. Here, we study the energy- and momentum-dependent quasiparticle lifetimes of excited states of a lead monolayer film on Ag(111) prior and after the adsorption of a monolayer of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA). Using time-resolved two-photon momentum microscopy, we show that the electron dynamics of the bare Pb/Ag(111) bilayer system is dominated by isotropic intraband scattering processes within the quantum well state as well as interband scattering processes from the QWS into the Pb sideband. After the adsorption of PTCDA on the Pb monolayer, the interband scattering is suppressed and the electron dynamics is solely determined by intraband or inelastic scattering processes. Our findings hence uncover a new possibility to selectively tune and control scattering processes of quantum well systems by the adsorption of organic molecules.
description: 9 pages, 5 figures
Modelling public-private-partnerships in Indian emergency medical services applying game theory
Creators: name: Anantharaman, Senthil Kumar
name: Kapoor, Rohit
Publisher: name: Zenodo
Year: 2019
Subjects: Contracts, Game theory, Emergency medical services (EMS), Moral Hazard, Matching, PPP, Signalling

description: Governments across the world have been preferring public-private-partnerships (PPP) over traditional methods in the past few decades to procure public services for their citizens. Developing countries, like India has the potential to successfully deploy PPP in providing integrated emergency medical services (EMS) like that of the west. This paper provides a base for implementing PPP contractual mechanism, when the government needs to maximize it social surplus or value for money (VFM). Further, the study attempts to observe the relationship between three players in a multiple principal agent model where government and global investor act as the principals and the service providers acts as the agents. This study intends to portray the equilibrium contract set among the three players including analysing moral hazard problems, signalling aspects, incentivization and matching through the entire contract cycle.
Rising and Sinking in Resonance: Probing the critical role of rotational dynamics for buoyancy driven spheres
Creators: name: Will, Jelle
name: Krug, Dominik
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present experimental results for spherical particles rising and settling in a still fluid. Imposing a well-controlled center of mass offset enables us to vary the rotational dynamics selectively by introducing an intrinsic rotational timescale to the problem. Results are highly sensitive even to small degrees of offset, rendering this a practically relevant parameter by itself. We further find that for a certain ratio of the rotational to a vortex shedding timescale (capturing a Froude-type similarity) a resonance phenomenon sets in. Even though this is a rotational effect in origin, it also strongly affects translational oscillation frequency and amplitude, and most importantly the drag coefficient. This observation equally applies to both heavy and light spheres, albeit with slightly different characteristics for which we offer an explanation. Our findings highlight the need to consider rotational parameters when trying to understand and classify path properties of rising and settling spheres.
description: 7 pages, 4 figures
title: A double integration hypothesis to explain ocean ecosystem response to climate forcing
Creators: name: Di Lorenzo, Emanuele
name: Ohman, Mark D.
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. Long-term timeseries of marine ecological indicators are often characterized by large-amplitude state transitions that can persist for decades. Understanding the significance of these variations critically depends upon the underlying hypotheses characterizing expected natural variability. We show using a linear auto-regressive model, in combination with long-term zooplankton observations off the California coast, that cumulative integrations of white noise atmospheric forcing can generate marine population responses that are characterized by strong transitions and prolonged apparent state changes. This model provides a new baseline hypothesis for explaining ecosystem variability and for interpreting the significance of abrupt responses and climate change signatures in marine ecosystems.
A recommendation for a complete open source policy
Creators: name: Christe, Steven
name: Ireland, Jack
name: Ryan, Dan
Publisher: name: Zenodo
Year: 2019
Subjects: sunpy
open source
nasa
white paper
national academy of sciences

description: A white paper to the National Academy of Sciences Committee on Best Practices for a Future Open Code Policy for NASA Space Science. It argues for and recommends that all NASA-funded science code be required to be open source (see the list of all white papers). The results of this Committee are published in Open Source Software Policy Options for NASA Earth and Space Sciences (https://doi.org/10.17226/25217).
Spectral energy distributions and high-energy emission of BL Lac type objects
Creators: name: Troitsky, Sergey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Based on identifications from the Veron and Quasars.org catalogs, we determine the optical-to-X-ray spectral indices for a sample of 201 BL Lac type objects (BLLs) and search for trends in the distribution of these indices of the sources detected in high-energy bands. We find that EGRET-detected sources are low-energy peaked and that the positional correlation with the arrival directions of ultra-high-energy cosmic rays from the previously studied AGASA, Yakutsk and High Resolution Fly's Eye samples is dominated by low-energy-peaked BLLs.
description: v.2: selection effects quantified, discussion of Auger results on BL Lac correlations extended. 5 pages, 4 figures, mn2e.cls style. The definitive version is available at http://www.blackwellsynergy.com
title: Large-scale climate forcing linked to phytoplankton biomass variability in the Northwest Atlantic
Creators: name: Saba, Vincent S.
name: Hyde, Kimberly J.W.
name: Friedland, Kevin D.
name: Hare, Jonathan A.
name: Link, Jason S.
name: Fogarty, Michael J.
Publisher: name: ASC 2013 - Theme session M
Year: 2024
Subjects: Technologies and data
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author. Phytoplankton are the base of the marine food web and a recent study of Large Marine Ecosystems (LMEs) worldwide suggested that high fisheries yield is associated with high surface chlorophyll-a (chl-a), a proxy for phytoplankton biomass. Here we analyzed satellite-derived chl-a from two different sensors (SeaWiFS & MODIS) at two different time-periods (1997-2010 & 2002-2012) covering the region of the United States Northeast Shelf Large Marine Ecosystem (U.S. NES LME) and off-shelf waters. We conducted an empirical orthogonal function (EOF) analysis of 1-km chl-a data that was post-processed using a regional algorithm to improve chl-a estimates in case-2 waters close to coastlines. We identified areas within the U.S. NES LME that had the strongest interannual variability of chl-a and analyzed relationships to large-scale climate forcing and local forcing (i.e. SST, nutrients, surface winds). The local mechanistic underpinnings that are linked to large-scale climate forcing and ultimately constrain the interannual variability of phytoplankton biomass will be discussed (i.e. winter winds versus circulation changes).
Sublattice Asymmetric Reductions of Spin Values on Stacked Triangular Lattice Antiferromagnet CsCoBr$_3$
Creators: name: Todoroki, Norikazu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the reductions of spin values of the ground state on a stacked triangular antiferromagnet using the spin-wave approach. We find that the spin reductions have sublattice asymmetry due to the cancellation of the molecular field. The sublattice asymmetry qualitatively analyzes the NMR results of CsCoBr$_3$.
description: 5pages, 5figures
A work fluctuation theorem for a Brownian particle in a non confining potentia
Creators: name: Streißnig, Christoph
name: Kantz, Holger
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using the Feynman-Kac formula, a work fluctuation theorem for a Brownian particle in a nonconfining potential, e.g., a potential well with finite depth, is derived. The theorem yields aninequality that puts a lower bound on the average work needed to change the potential in time.In comparison to the Jarzynski equality, which holds for confining potentials, an additional termdescribing a form of energy related to the never ending diffusive expansion appears.