cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Η απονομή δικαιοσύνης στο Βυζάντιο(9ος-12ος αιώνες): τα δικαιοδοτικά όργανα και τα δικαστήρια της πρωτεύουσας
Creators: name: Γκουτζιουκώστας, Ανδρέας
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Κριτής
Κοιαίστωρ
Επαρχος
Δρουγγάριος
Ιππόδρομος
Νομοφύλαξ
Kriter(judger)
Koiaistor(quaestor)
Eparchos(eparch)
Droungarios
Hippodrome
Nomophylax

description: Αντικείμενο έρευνας της παρούσας διδακτορικής διατριβής είναι η απονομή δικαιοσύνης από τον 9ο μέχρι και τον 12ο αιώνα. Η μελέτη επικεντρώνεται στα κοσμικά δικαστήρια και τα δικαιοδοτικά όργανα που εδρεύουν στην Κωνσταντινούπολη, τα σημαντικότερα της αυτοκρατορίας. Το ζήτημα είναι περίπλοκο καθώς η οργάνωση της δικαιοσύνης αποτελεί κλάδο της διοίκησης στο Βυζάντιο. Η έρευνα στηρίχθηκε στη μελέτη αφηγηματικών και νομικών πηγών, εθιμοτυπικών τακτικών, μοναστηριακών αρχείων, επίσημων εγγράφων και σφραγίδων. Επιχειρήθηκε η κριτική παρουσίαση των απόψεων που έχουν κατά καιρούς διατυπωθεί τόσο από τους ιστορικούς του δικαίου όσο και από τους ερευνητές της βυζαντινής ιστορίας. Η μελέτη επισημαίνει τις αλλαγές σχετικά με το δικαστικό σύστημα, τη συμμετοχή του αυτοκράτορα στην απονομή της δικαιοσύνης, τη νομική παιδεία των δικαιοδοτικών οργάνων και τη σημασία του νόμου για τους Βυζαντινούς. Νέα συμπεράσματα προέκυψαν σχετικά με τον σκεπαστό ιππόδρομο, που αποτελούσε τόπο εκδίκασης υποθέσεων, τους κριτές επί του ιπποδρόμου και τους κριτές του βήλου(αρμοδιότητες, έδρα, ιεραρχία, αριθμός). Τέλος, αναθεωρούνται ορισμένες απόψεις της νεότερης έρευνας σχετικά με αξιωματούχους που συμμετέχουν στην απονομή της δικαιοσύνης(επί των κρίσεων, νομοφύλαξ, δικαιοφύλαξ, θεσμοφύλαξ, πραίτωρ, λογοθέτης των σεκρέτων, προκαθήμενος των δημοσιακών δικαστηρίων) και διατυπώνονται νέες προτάσεις
description: The theme of my doctoral dissertation deals with the problem of the administration of justice in the Byzantine Empire and specifically for a period of four centuries(9th-12th centuries). My research focuses on the secular Byzantine tribunals of Constantinople, the highest courts of the empire. The problems i had to deal with were complex and related with the structure of administration of the empire. My research is based on historical and literally sources, legal primary sources, and also official published documents and seals. It has also taken into consideration the various views of the modern research about the Byzantine judicial system, supported by historians and legal experts. My thesis points out the changes that occured in the judicial systems, the emperor's participation in justice, the legal education of the officers and the byzantine concept of law. New conclusions were formulated regarding the covered hippodrome, which was used as a court house, the judges of the hippodrome and the judges of velum(duties, seat, hierarchy, number). Finally modern aspects about offices related with the administration of justice(επί των κρίσεων, νομοφύλαξ, δικαιοφύλαξ, θεσμοφύλαξ, πραίτωρ, λογοθέτης των σεκρέτων, προκαθήμενος των δημοσιακών δικαστηρίων) are revised and new suggestions are proposed
Possible experimental signatures at the LHC of strongly interacting electro-weak symmetry breaking
Creators: name: Fabbrichesi, M.
name: Vecchi, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: If electro-weak symmetry is broken by a new strongly interacting sector, new physics will probably manifest itself in gauge boson scattering at the LHC. The relevant dynamics is well described in terms of an effective lagrangian. We discuss the probable size of the coefficients of the relevant operators under a combination of model-independent constraints and reasonable assumptions based on two models of the strongly interacting sector. We compare these values with LHC sensitivity and argue that they will be too small to be seen. Therefore, the presence of vector and scalar resonances required by unitarity will be the only characteristic signature. We analyze the most likely masses and widths of these resonances.
description: 14 pages, pdftex, 5 figures, improved discussion of bounds, 1 footnote removed
Line-depth ratios as indicators of effective temperature and surface gravity
Creators: name: Matsunaga, Noriyuki
name: Jian, Mingjie
name: Taniguchi, Daisuke
name: Elgueta, Scarlet Saez
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The analysis of stellar spectra depends upon the effective temperature (Teff) and the surface gravity (log g). However, the estimation of log g with high accuracy is challenging. A classical approach is to search for log g that satisfies the ionization balance, i.e., the abundances from neutral and ionized metallic lines being in agreement. We propose a method of using empirical relations between Teff, log g and line-depth ratios, for which we meticulously select pairs of FeI and FeII lines and pairs of CaI and CaII lines. Based on YJ-band (0.97-1.32 micron) high-resolution spectra of 42 FGK stars (dwarfs to supergiants), we selected five FeI-FeII and four CaI-CaII line pairs together with 13 FeI-FeI pairs (for estimating Teff, and derived the empirical relations. Using such relations does not require complex numerical models and tools for estimating chemical abundances. The relations we present allows one to derive Teff and log g with a precision of around 50 K and 0.2 dex, respectively, but the achievable accuracy depends on the accuracy of the calibrators' stellar parameters. It is essential to revise the calibration by observing stars with accurate stellar parameters available, e.g., stars with asteroseismic log g and stars analyzed with complete stellar models taking into account the effects of non-local thermodynamic equilibrium and convection. In addition, the calibrators we used have a limited metallicity range, [Fe/H] between -0.2 and +0.2 dex, and our relations need to be tested and re-calibrated based on a calibrating dataset for a wider range of metallicity.
description: 14 pages plus 6 additional pages (table and plots), 9 figures, 4 tables. Accepted for publication in MNRAS
Η οργάνωση του στρατού κατά την ύστερη βυζαντινή περίοδο(1204-1453)
Creators: name: Παναγιωτίδης, Κοσμάς Σ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Στρατολογία
Μισθοφορία
Recruitment
Mercenaries

description: Στη διατριβή αυτή ερευνάται η οργάνωση του βυζαντινού στρατού κατά τους τελευταίους αιώνες της αυτοκρατορίας(1204-1453). Η έρευνα επικεντρώθηκε στους σημαντικότερους τομείς του στρατού : η διοικητική οργάνωση, η στρατολογία, η μισθοφορική στρατολογία και οι συνέπειές της, οι ειδικές κατηγορίες στρατιωτών(κατάφρακτοι στρατιώτες, ψιλοί, γυμνητεία-γυμνικόν, όχλος, δημοτικόν κ.ά.), το βοηθητικό προσωπικό του στρατεύματος(αχθοφόροι και "τζουλούκωνες"), η ηγεσία του στρατεύματος(μέγας δομέστικος, πρωτοστράτωρ, δραγγάριος της βίγλας, κριτής του φοσσάτου, μέγας στρατοπεδάρχης, μέγας κονόσταυλος, επί του στρατού, μέγας αδνουμιαστής κ.ά.) όπως και στους μη στρατιωτικούς αξιωματούχους που ανέλαβαν στρατιωτικά καθήκοντα. Η εργασία στηρίχθηκε στη μελέτη όλων των σχετικών πηγών και εργασιών και συμπληρώνει τις γνώσεις μας στο υπό εξέταση θέμα
description: The subject of the present doctorate is "the organisation of teh army in the late byzantine period(1204-1453). The study is focussed on the administration, recruitment, mercnary recruitment and its consequences, the special categories of soldiers on the troops of support the army officials and other categories of officials. The doctorate is based on the study of all available sources and relevant bibliography contributing thus to a global approach of the subject
An oversized magnetic sheath wrapping around the parsec-scale jet in 3C 273
Creators: name: Lisakov, M. M.
name: Kravchenko, E. V.
name: Pushkarev, A. B.
name: Kovalev, Y. Y.
name: Savolainen, T. K.
name: Lister, M. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In recent studies, several AGN have exhibited gradients of the Faraday Rotation Measure (RM) transverse to their parsec-scale jet direction. Faraday rotation likely occurs as a result of a magnetized sheath wrapped around the jet. In the case of 3C 273, using Very Long Baseline Array multi-epoch observations at 5, 8 and 15 GHz in 2009--2010, we observe that the jet RM has changed significantly towards negative values compared with that previously observed. These changes could be explained by a swing of the parsec-scale jet direction which causes synchrotron emission to pass through different portions of the Faraday screen. We develop a model for the jet-sheath system in 3C 273 where the sheath is wider than the single-epoch narrow relativistic jet. We present our oversized sheath model together with a derived wide jet full intrinsic opening angle $α_\mathrm{int}=2.1^\circ$ and magnetic field strength $B_{||}=3$ $μ$G and thermal particle density $N_\mathrm{e}=125~\mathrm{cm}^{-3}$ at the wide jet--sheath boundary 230 pc downstream (deprojected) from its beginning. Most of the Faraday rotation occurs within the innermost layers of the sheath. The model brings together the jet direction swing and long-term RM evolution and may be applicable to other AGN jets that exhibit changes of their apparent jet direction.
description: 10 pages, 9 figures. Accepted to the Astrophysical Journal
An examination of several in-basket scoring strategies and their effect on reliability and criterion-related validity
Creators: name: Harlos, Karen P.
Publisher: name: University of British Columbia
Year: 2008

description: The in-basket exercise, a paper-and-pencil measure of administrative ability, is an assessment technique characterized by complex, often subjective scoring procedures which have limited wide-scale applications of this popular instrument. Because the literature affords no clear classification system for this and related exercises, a structure which clarified the definitions of and relationships among management games, management simulations, work sample tests, and in-basket exercises was introduced. The primary purpose of the present research was to investigate the cross-sample generalizability of several strategies for scoring the in-basket exercise, including a reduced-item scoring approach in which an optimal subset of items was identified for scoring. The preliminary studies upon which the present research is based are also discussed in the present work. In addition to examining the impact of these scoring strategies on reliability and criterion-related validity, consideration was given to addressing long-standing concerns of in-basket training- and scoring time demands. Three hundred and twenty-one entry-level employees from a large western Canadian utility company were administered the same in-basket exercise previously applied in a different Canadian utility company. Contrary to expectations, the shrinkage in validity using an empirically-based scoring key was substantial, pointing to the selection of a more logically-derived panel key as the method of choice. The introduction of a new cognitive-based measure of in-basket performance showed promising results. In addition, the reduced-item scoring approach did not result insignificant losses in reliability or criterion-related validity, thus allowing substantial reductions in training- and scoring-time. Implications for in-basket development are also considered.
Numerical Qualification of Eco-Friendly Gas Mixtures for Avalanche-Mode Operation of Resistive Plate Chambers in INO-ICAL
Creators: name: Datta, Jaydeep
name: Tripathy, Sridhar
name: Majumdar, Nayana
name: Mukhopadhyay, Supratik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Numerical qualification of an eco-friendly alternative gas mixture for avalanche mode operation of Resistive Plate Chambers is the soul of this work. To identify the gas mixture, a numerical model developed elsewhere by the authors has been first established by comparing the simulated figure of merits (efficiency and streamer probability) with the experimental data for the gas mixture used in INO-ICAL. Then it has been used to simulate the same properties of a gas mixture based on argon, carbon di-oxide and nitrogen, identified as potential replacement by studying its different properties. Efficacy of this eco-friendly gas mixture has been studied by comparing the simulated result with the standard gas mixture used in INO-ICAL as well as with experimental data of other eco-friendly hydrofluorocarbon (HFO1234ze) based potential replacements. To increase the efficacy of the proposed gas mixture, studies of the traditional way (addition of a little amount of SF$_6$) and an alternative approach (exploring the option of high-end electronics) were carried out.
description: 16 pages, 9 figures, Accepted for publication at JINST
Orbital contribution to the magnetic properties of iron as a function of dimensionality
Creators: name: Desjonquères, Marie-Catherine
name: Barreteau, Cyrille
name: Autes, Gabriel
name: Spanjaard, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The orbital contribution to the magnetic properties of Fe in systems of decreasing dimensionality (bulk, surfaces, wire and free clusters) is investigated using a tight-binding hamiltonian in an $s, p,$ and $d$ atomic orbital basis set including spin-orbit coupling and intra-atomic electronic interactions in the full Hartree-Fock (HF) scheme, i.e., involving all the matrix elements of the Coulomb interaction with their exact orbital dependence. Spin and orbital magnetic moments and the magnetocrystalline anisotropy energy (MAE) are calculated for several orientations of the magnetization. The results are systematically compared with those of simplified hamiltonians which give results close to those obtained from the local spin density approximation. The full HF decoupling leads to much larger orbital moments and MAE which can reach values as large as 1$μ_B$ and several tens of meV, respectively, in the monatomic wire at the equilibrium distance. The reliability of the results obtained by adding the so-called Orbital Polarization Ansatz (OPA) to the simplified hamiltonians is also discussed. It is found that when the spin magnetization is saturated the OPA results for the orbital moment are in qualitative agreement with those of the full HF model. However there are large discrepancies for the MAE, especially in clusters. Thus the full HF scheme must be used to investigate the orbital magnetism and MAE of low dimensional systems.
Resolved HI in two ultra-diffuse galaxies from contrasting non-cluster environments
Creators: name: Scott, T. C.
name: Sengupta, Chandreyee
name: Lagos, P.
name: Chung, Aeree
name: Wong, O. Ivy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on the first resolved HI observations of two blue ultra-diffuse galaxies (UDGs)using the Giant Metrewave Radio Telescope (GMRT). These observations add to the sofar limited number of UDGs with resolved HI data. The targets are from contrasting non-cluster environments: UDG-B1 is projected in the outskirts of Hickson Compact Group 25 and Secco-dI-2 (SdI-2) is an isolated UDG. These UDGs also have contrasting effective radii with Re of 3.7 kpc (similar to the Milky Way) and 1.3 kpc respectively. SdI-2 has an unusually large MHI/M* ratio =28.9, confirming a previous single dish HI observation. Both galaxies display HI morphological and kinematic signatures consistent with a recent tidal interaction, which is also supported by observations from other wavelengths, including optical spectroscopy. Within the limits of the observations' resolution, our analysis indicates that SdI-2 is dark matter-dominated within its HI radius and this is also likely to be the case for UDG-B1. Our study highlights the importance of high spatial and spectral resolution HI observations for the study of the dark matter properties of UDGs.
description: 13 pages , 8 Figures
Ανάπτυξη και επικύρωση μεθόδων για τον προσδιορισμό βιταμινών με υγρή χρωματογραφία υψηλής πίεσης μετά από εκχύλιση στερεάς φάσης-υγρού: εφαρμογή σε φαρμακευτικά σκευάσματα και βιολογικά υγρά
Creators: name: Χατζημιχαλάκης, Παύλος Φ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Υδατοδιαλύτες
Λιποδιαλύτες
Βιολογικά υγρά
Watersoluble
Fatsoluble
Biological fluids

description: Ο σκοπός της διατριβής είναι ο ταυτόχρονος προσδιορισμός των υδατοδιαλυτών και των λιποδιαλυτών βιταμινών σε φαρμακευτικά πολυβιταμινούχα σκευάσματα και σε βιολογικά υγρά, όπως ο ορός αίματος και τα ούρα. Αξίζει να αναφερθεί ότι η διατριβή αυτή αποτελεί την πιο πλήρη αναφορά στη βιβλιογραφία μέχρι σήμερα μιας και επιτυγχάνεται ανίχνευση επτά υδατοδιαλυτών και οκτώ λιποδιαλυτών βιταμινών
description: The objective of the present work was the simultaneous determination of both water-soluble vitamins and fat-soluble vitamins in pharmaceutical formulations and human biological fluids, such as blood serum and urine. This is the most complete report in literature so far, since seven different water-soluble vitamins and eight different fat-soluble vitamins were determined
Effects of external flow on resonant absorption of coronal loop kink oscillations driven by an external fast wave: Selective excitation problem
Creators: name: Yu, Dae Jung
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Resonant absorption is considered as a crucial mechanism for the damping of the coronal loop oscillations and plasma heating. We study resonant absorption of the coronal loop kink oscillations excited by such external drivers as flares on the assumption that there is an intermediate shear flow region surrounding the loop. We find that for long coronal loops resonant absorption can be highly enhanced or reduced depending sensitively on the magnitude and direction of the flow and the spatial extent of the flow region when the transitional layer is thin. For short coronal loops, high flow speed and thick transitional layer are needed to have a substantial resonant absorption. We provide a potential picture to explain the results where the external Alfvén speed and phase speed of the wave are important parameters. These results imply that the transport of the external wave energy into the loop is significantly changed by the shear flow region, which may cause the selective excitation of the coronal loop oscillations.
description: ApJ 911, 131 (2021)
Καθορισμός των δασικών φυτοκοινωνιολογικών μονάδων του ελληνικού τμήματος του όρους Μπέλες και της οροσειράς του Κρουσίων
Creators: name: Φωτιάδης, Γεώργιος Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004

description: Η εργασία αυτή αποσκοπεί στη φυτοκοινωνιολογική ανάλυση των δασικών μονάδων βλάστησης της οροσειράς των Κρουσίων και του ελληνικού τμήματος του όρους Μπέλες. Σχεδόν το σύνολο των φυσικών οικοσυστημάτων της περιοχής έρευνας, ιδιαίτερα αυτά στα χαμηλά υψόμετρα, είναι επηρεασμένο από τις ανθρώπινες δραστηριότητες(κτηνοτροφία, ξυλεύσεις κλπ.). Η δασική βλάστηση του ελληνικού τμήματος του όρους Μπέλες και της οροσειράς του Κρουσίων μελετήθηκαν φυτικοινωνιολογικά με τη μέθοδο του Braun-Blanquet(1951, 1964). Διενεργήθηκαν 401 φυτοληψίες, οι οποίες μαζί με τις 63 βιβλιογραφίες, δημιούργησαν ένα φυτοπίνακα 464 φυτοληψιών. Οι μονάδες βλάστησης που διακρίθηκαν ανήκουν στις κλάσεις Populetea albae(υγροτοπική βλάστηση), Rhamno-Prunetea spinosae(sibljak) και Querco-Fagetea(μεικτά φυλλοβόλα δάση, δάση οξιάς και δάση ελάτης, με υπομεσογειακό έως και εύκρατο χαρακτήρα)
description: The aim of this study is the phytosociological analysis of the forest vegetation units of Krousia mountains and the Greek part of mount Beles. Vegetational structure of this forests is affected by human interventions, especially at lowlands(grazing, copping, lodging etc.). Forest vegetation of the Greek part of mount Beles and Krousia mountains was studied phytosociologicaly by the method of Braun-Blanquet(1951, 1964). We carried out 401 releves which, combined with 63 releves from bibliography, formed a phytosociological table of 464 releves. Systematically, the forests are classified into the classes Populetea albae(hygrophilus forests), Phamno-Prunetea spinosae(sibljak shrubs) and Querco-Fagetea (deciduous mesic and xerophilous woods of temperate Europe)
Constraints on the mass and atmospheric composition and evolution of the low-density young planet DS Tuc A b
Creators: name: Benatti, S.
name: Damasso, M.
name: Borsa, F.
name: Locci, D.
name: Pillitteri, I.
name: Desidera, S.
name: Maggio, A.
name: Micela, G.
name: Wolk, S.
name: Claudi, R.
name: Malavolta, L.
name: Modirrousta-Galian, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We performed a radial velocity (RV) monitoring of the 40 Myr old star DS Tuc A with HARPS at the ESO-3.6m to determine the planetary mass of its 8.14-days planet, first revealed by TESS. We also observed two planetary transits with HARPS and ESPRESSO at ESO-VLT, to measure the Rossiter-McLaughlin (RM) effect and characterise the planetary atmosphere. We measured the high-energy emission of the host with XMM observations to investigate models for atmospheric evaporation. We employed Gaussian Processes (GP) regression to model the high level of the stellar activity, which is more than 40 times larger than the expected RV planetary signal. We extracted the transmission spectrum of DS Tuc A b from the ESPRESSO data and searched for atmospheric elements/molecules either by single-line retrieval and by performing cross-correlation with a set of theoretical templates. Through a set of simulations, we evaluated different scenarios for the atmospheric photo-evaporation of the planet induced by the strong XUV stellar irradiation. While the stellar activity prevented us from obtaining a clear detection of the planetary signal from the RVs, we set a robust mass upper limit of 14.4 M_e for DS Tuc A b. We also confirm that the planetary system is almost (but not perfectly) aligned. The strong level of stellar activity hampers the detection of any atmospheric compounds, in line with other studies presented in the literature. The expected evolution of DS Tuc A b from our grid of models indicates that the planetary radius after the photo-evaporation phase will fall within the Fulton gap. The comparison of the available parameters of known young transiting planets with the distribution of their mature counterpart confirms that the former are characterised by a low density, with DS Tuc A b being one of the less dense.
description: 24 pages, 19 figures, Accepted for publication on Astronomy and Astrophysics
Mean field theory for the three-dimensional Coulomb glass
Creators: name: Mueller, Markus
name: Pankov, Sergey
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the low temperature phase of the 3D Coulomb glass within a mean field approach which reduces the full problem to an effective single site model with a non-trivial replica structure. We predict a finite glass transition temperature $T_c$, and a glassy low temperature phase characterized by permanent criticality. The latter is shown to assure the saturation of the Efros-Shklovskii Coulomb gap in the density of states. We find this pseudogap to be universal due to a fixed point in Parisi's flow equations. The latter is given a physical interpretation in terms of a dynamical self-similarity of the system in the long time limit, shedding new light on the concept of effective temperature. From the low temperature solution we infer properties of the hierarchical energy landscape, which we use to make predictions about the master function governing the aging in relaxation experiments.
description: 29 pages, 18 figures; version accepted to Phys. Rev. B, a few minor additions
Исследование характеристик воздействия длинных поверхностных волн на неподвижный частично погруженный недеформируемый объект методами численного моделирования
Creators: name: Gusev, Oleg
name: Gayaz Khakimzyanov
name: Chubarov, Leonid
Publisher: name: figshare
Year: 2021
Subjects: subject: 91501 Computational Fluid Dynamics
subject: FOS: Other engineering and technologies
subject: 91101 Marine Engineering
subject: FOS: Environmental engineering
subject: 91103 Ocean Engineering
subject: 91507 Risk Engineering (excl. Earthquake Engineering)

description: В докладе обсуждается методика расчета силового воздействия длинных поверхностных волн на заякоренные гидротехнические конструкции и результаты исследования зависимостей характеристик такого воздействия от основных параметров процесса – размеров конструкции, ее заглубления, формы, длины и амплитуды падающих волн. Задача решается в рамках математической модели потенциальных течений. Результаты численного моделирования сопоставляются с известными точными решениями различных приближений, с доступными экспериментальными данными и результатами расчетов других авторов. В частности показано, что при относительно небольших заглублениях конструкции более длинные волны оказывают меньшее воздействие на неё, в то время как при больших заглублениях и в случае воздействия волны на вертикальную стенку наблюдается обратная закономерность. Результаты исследования обладают известной практической значимостью, связанной с необходимостью принятия решений по конструированию, размещению и эксплуатации гидротехнических конструкций, возводимых в прибрежных акваториях, подверженных воздействию длинных поверхностных волн природного и антропогенного происхождения.
Islands and complexity of eternal black hole and radiation subsystems for a doubly holographic model
Creators: name: Bhattacharya, Aranya
name: Bhattacharyya, Arpan
name: Nandy, Pratik
name: Patra, Ayan K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the entanglement islands and subsystem volume complexity corresponding to the left/ right entanglement of a conformal defect in $d$-dimensions in Randall-Sundrum (RS) braneworld model with subcritical tension brane. The left and right modes of the defect mimic the eternal black hole and radiation system respectively. Hence the entanglement entropy between the two follows an eternal black hole Page curve which is unitarity compatible. We compute the volumes corresponding to the left and right branes with preferred Ryu-Takanayagi (RT) surfaces at different times, which provide a probe of the subregion complexity of the black hole and the radiation states respectively. An interesting jump in volume is found at Page time, where the entanglement curve is saturated due to the inclusion of the island surfaces. We explain various possibilities of this phase transition in complexity at Page time and argue how these results match with a covariant proposal qualitatively.
description: Minor changes, new references added, accepted for publication in JHEP
Ditidaht Notebook 1
Creators: name: Edgar, Christine
name: Shepherd, Dorothy
name: Tate, Fran
name: Thompson, Michael
name: Sylak-Glassman, John
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: noo

description: One field notebook from researcher's first field trip to work on Ditidaht. Contains primarily vocabulary elicitation and brief cultural notes.

(The digital files associated with this Item include a series of scanned images from original physical objects. These images are aggregated at lower resolution in the file Sylak-Glassman.002.001.pdf. The original full resolution scans are collected in Sylak-Glassman.002.001.zip. Metadata pertaining to each scanned image is compiled in the tab-separated text file Sylak-Glassman.002.001-image_metadata.txt.)
On local geometry of nonholonomic rank 2 distributions
Creators: name: Doubrov, Boris
name: Zelenko, Igor
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58A30, 53A55

description: In 1910 E. Cartan constructed a canonical frame and found the most symmetric case for maximally nonholonomic rank 2 distributions in $\mathbb R^5$. We solve the analogous problem for germs of generic rank 2 distributions in ${\mathbb R}^n$ for n>5. We use a completely different approach based on the symplectification of the problem. The main idea is to consider a special odd-dimensional submanifold $W_D$ of the cotangent bundle associated with any rank 2 distribution D. It is naturally foliated by characteristic curves, which are also called the abnormal extremals of the distribution D. The dynamics of vertical fibers along characteristic curves defines certain curves of flags of isotropic and coisotropic subspaces in a linear symplectic space. Using the classical theory of curves in projective spaces, we construct the canonical frame of the distribution D on a certain (2n-1)-dimensional fiber bundle over $W_D$ with the structure group of all Möbius transformations, preserving 0.
description: 21 pages, this is the long version of the short note math.DG/0504319 (the latter was published in C.R. Acad. Sci. Paris, Ser. I, Vol. 342, Issue 8 (15 April 2006), 589-594
Behaviors of susceptible-infected epidemics on scale-free networks with identical infectivity
Creators: name: Zhou, Tao
name: Liu, Jian-Guo
name: Bai, Wen-Jie
name: Chen, Guanrong
name: Wang, Bing-Hong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this article, we proposed a susceptible-infected model with identical infectivity, in which, at every time step, each node can only contact a constant number of neighbors. We implemented this model on scale-free networks, and found that the infected population grows in an exponential form with the time scale proportional to the spreading rate. Further more, by numerical simulation, we demonstrated that the targeted immunization of the present model is much less efficient than that of the standard susceptible-infected model. Finally, we investigated a fast spreading strategy when only local information is available. Different from the extensively studied path finding strategy, the strategy preferring small-degree nodes is more efficient than that preferring large-degree nodes. Our results indicate the existence of an essential relationship between network traffic and network epidemic on scale-free networks.
description: 5 figures and 7 pages
MIBG uptake in the hypertensive-diabetic rat heart
Creators: name: Herman, Lynda Michelle
Publisher: name: University of British Columbia
Year: 2008

description: Failure of the cardiovascular system, which is further exacerbated in the presence of hypertension, is considered the leading cause of death in diabetic individuals. Our aim in this study was to investigate the cardiac adrenergic neuronal changes induced by diabetes and hypertension, and then to correlate these changes with the contractile state of the myocardium. By using the radioactive agent, I-123 meta-iodobenzylguanidine (MIBG), which has the same uptake, storage and release mechanism as norepinephrine (NE), a non-invasive measurement of the integrity of the adrenergic nerve endings in heart and spleen was investigated. One week following streptozotocin (STZ) injection (55 mg/kg), male Sprague-Dawley rats were divided into two groups. They were given subcutaneous injections of either deoxycorticosterone-acetate (DOCA, 25 mg/kg) or DOCA vehicle twice weekly for 3, 6, 9, or 12 weeks, and received 0.9% saline with 0.5% KCl to drink. Rats were designated by their respective treatments for each time period: CON, DOCA, STZ, and STZ-DOCA. After 3, 6, 9, or 12 weeks of commencing DOCA or DOCA-vehicle treatment, MIBG was injected intravenously (15 mCi/mg). Five hours later the heart and spleen were dissected and counted with a gamma counter. Results were expressed as % Kg Dose and % Kg Dose/g. In similarly treated animals, after 12 weeks, the contractile function of the myocardium was studied using left ventricular papillary muscle preparations. Cardiac NE concentration was determined using HPLC with electrochemical detection. Although cardiac NE stores in STZ and STZ-DOCA were significantly increased from CON, results showed decreased MIBG uptake into the diabetic hearts at all time points compared to CON . There were no differences in MIBG values at any time point between STZ and STZ-DOCA. DOCA, STZ, and STZ-DOCA demonstrated significant reduction in MIBG accumulation in their left ventricles from 3 to 12 weeks. Length-tension studies revealed that with increasing preload tension the contractile performance in the STZ group was significantly diminished from CON between 4.5 g and 5.5 g. There were no significant differences between any of the other groups with increasing muscle length. None of the muscles responded well to the addition of either isoproterenol (1x10⁻¹⁰ to 1x10⁻⁴M) or tyramine (1x10⁻⁴ to 1x10⁻²M). From these results we concluded that either: 1) MIBG does not provide an accurate indication of adrenergic integrity; or 2) there is no correlation between sympathetic function and myocardial function after 12 weeks of DOCA or DOCA-vehicle treatment in diabetic rats. We also concluded that DOCA-induced hypertension does not significantly affect the sympathetic nervous activity or negatively affect myocardial functioning in diabetic animals.
Η προστασία του κοινοτικού σήματος και ειδικότερα οι περιορισμοί αυτής
Creators: name: Κουτσοχήνας, Ευστάθιος Β.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Βιομηχανική ιδιοκτησία
Industrial property

description: Σκοπός της διατριβής είναι ο προσδιορισμός του ακριβούς προστατευόμενου περιεχομένου του δικαιώματος στο κοινοτικό σήμα. Στο πρώτο μέρος αναδεικνύονται οι λόγοι θεσμοθέτησης του συστήματος κοινοτικών σημάτων. Στο δεύτερο μέρος παρουσιάζεται το νομοθετικό πλαίσιο του θεσμού του κοινοτικού σήματος. Εξετάζονται οι κυριότερες διατάξεις των σχετικών νομοθετικών κειμένων, με έμφαση σε αυτές που αναφέρονται στη διαδικασία καταχώρησης των κοινοτικών σημάτων, και διατυπώνονται οι αρχές που διέπουν το κοινοτικό σήμα. Στο τρίτο μέρος αναλύονται οι διατάξεις ουσιαστικού δικαίου του Κανονισμού 40/94 περί προστασίας και περιορισμών προστασίας του κοινοτικού σήματος. Οριοθετούνται οι κρίσιμες έννοιες του κινδύνου σύγχυσης, των σημάτων φήμης και των προστατευόμενων λειτουργιών του κοινοτικού σήματος, ενώ εξετάζονται ένας προς έναν οι περιορισμοί της προστασίας του κοινοτικού σήματος. Στο τέταρτο μέρος μελετώνται διατάξεις δικονομικού δικαίου. Στο πέμπτο μέρος διατυπώνονται συμπεράσματα ως προς το μοντέλο προστασίας που υιοθετεί ο Κανονισμός 40/94 και ως προς τις επιδράσεις αυτού στο εθνικό δίκαιο των σημάτων
description: The aim of the submitted thesis is to define the scope of protection of a right to a community trademark. The first part describes the reasons for adopting a pan-European trademark right. The second part examines the main provisions of Regulation 40/94, focusing on those of the registration procedure, and displays the basic principles which govern the community trade mark. The third part is devoted to the examination of the provisions of Regulation 40/94 concerning the protection of teh CTM and its limitations. The fourth part deals with matters of jurisdiction and procedure. The fifth part contains conclusions concerning the protection model of the CTM and its influence on national trademark law
Σύνθεση και μελέτη των δομικών & μαγνητικών ιδιοτήτων των διαμεταλλικών ενώσεων R3(Fe1-XCox)29-yTy(R=Nd, Tb, Dy, Y, T=Ti, V)
Creators: name: Σαραφίδης, Χαράλαμπος Σ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Δομικές ιδιότητες
Μαγνητοκρυσταλλική ανισοτροπία
Structural properties
Magnetocrystalline anisotropy

description: Οι ενώσεις δομής τύπου Nd3(Fe, Ti)29(3:29) ανακαλύφθηκαν το 1994. Εμφανίζουν χαμηλή μονοκλινή συμμετρία και μετασταθή χαρακτήρα που προκαλεί περίπλοκες μαγνητικές δομές που δεν ευνοούν την χρήση τους σε πρακτικές εφαρμογές. Στόχος της παρούσης εργασίας ήταν η βελτίωση των μαγνητικών ιδιοτήτων με την μερική αντικατάσταση Fe από Co. Στο πλαίσιο της παρούσης εργασίας παρασκευάστηκαν για πρώτη φορά οι σειρές ενώσεων R3(Fe1-xCox)29-yMy (R=Nd, Tb, Dy, Y, M=Ti, V) με χ=0-0.4. Η μελέτη της δομής έδειξε ότι είναι δυνατή στις περισσότερες περιπτώσεις η αντικατάσταση ατόμων Fe από Co μέχρι ποσοστό 40% χωρίς αλλαγή ή κατάρρευση της δομής. Οι πλεγματικές παράμετροι εμφανίζουν μία κανονική εξάρτηση από την περιεκτικότητα σε Co. Η θερμοκρασία Curie αυξάνεται μονότονα και η μαγνήτιση κόρου εμφανίζει μία συμπεριφορά Slater-Pauling με μέγιστο σε θερμοκρασία δωματίου για χ=0.2. Η συγκεκριμένη στοιχειομετρική αλλαγή προκαλεί μεταβολές και στην μαγνητοκρυσταλλική ανισοτροπία, ιδιαίτερα έντονες στην περίπτωση της σειράς με R=ND. Επίσης, στο πλαίσιο της παρούσης εργασίας μελετήθηκε η επίδραση της ενδόθετης εισαγωγής στο πλέγμα ατόμων αζώτου(νιτριδίωση). Η νιτριδίωση έχει ιδιαίτερα θετικές επιπτώσεις στην θερμοκρασία Curie και στο πεδίο ανισοτροπίας των υλικών. Το κόστος είναι μια ελάφρά μείωση της μαγνήτισης κόρου στα δείγματα με υψηλή περιεκτικότητα σε Co. Η ένωση με R=Nd, x=0.2 και το νιτρίδιο της ένωσης με R=Nd, x=0.1 προτείνονται για χρήση ως μόνιμοι μαγνήτες
description: The Nd3(Fe, Ti)29 type compounds(3:29) were discovered in 1994. They have low monoclinic symmetry and metastable character producing complex magnetic structures. The general properties of the 3:29 type of compounds do not promote their usage in practical applications. The objective of the present work was the improvement of the magnetic properties of these materials by partial replacement of Fe for Co. The synthesis of the R3(Fe1-xCox)29-yMy(R=Nd, Tb, Dy, Y, M=Ti, V)(x=0-0.4) series is presented here for the first time. The replacement of Fe for Co is possible up to 40% without structural changes in the structure or collapse. The lattice parameters present a normal change with Co concentration. The Curie temperature is monotonically increasing and the saturation magnetization presents a Slater-Pauling behavior with room temperature maximum in the sample with 20% Co.Changes in the magnetocrystalline anisotropy were observed. In the present work the influence of the interstitial insertion of Nitrogen atoms was studied. This modification improves the Curie temperature and the anisotropy field of the materials. On the other hand the samples with R=Nd, x=0.2 and the nitride with R=Nd, x=0.1 are suggested as future permanent magnet materials
Wireless colorimetric readout to enable resource-limited point-of-care
Creators: name: Smith, Suzanne
Publisher: name: Karlsruhe
Year: 2019
Subjects: paper-based diagnostics
printed electronics
printed RFID tags
wireless readout
colorimetric readout

description: Patientennahe Diagnostik in Entwicklungsländer birgt spezielle Herausforderungen, die ihren Erfolg bisher begrenzen. Diese Arbeit widmet sich daher der Entwicklung eines in seiner Herstellung skalierbaren und vielseitig einsetzbaren funkbasierten Auslesegerätes für Laborteststreifen. Durch die Kombination einer wachsenden Auswahl an papierbasierten Teststreifendiagnostiken mit gedruckter Elektronik und unter Berücksichtigung des diagnostischen Alltags im südlichen Afrika wurde ein Gerät entwickelt, das Teststreifen zuverlässig ausliest und die Daten per Funk an eine Datenbank übertragen kann. Die Technik basiert auf RFID-Tags (radio frequency identification devices), welche auf verschiedene flexible Substrate gedruckt wurden, um die technische Umsetzbarkeit und Funktionalität zu evaluieren. Um den Preis für die geplante Anwendung niedrig zu halten, wurden unter anderem Papier und Karton als Substrate genutzt. Das Ergebnis dieser Studie sind passive RFID-Tags auf unterschiedlichen, meist günstigen Substraten, die über eine Distanz von über 75 mm betrieben und ausgelesen werden können. Basierend auf der über RFID bereitgestellten Energie und Datenübertragung wurde eine Ausleseeinheit für Standardpapierstreifentests entwickelt und integriert. Durch das Auslesen verschiedener Teststreifen wurde das Gerät evaluiert und in seiner Aussagekraft mit einer scanner-basierten Aufnahme und anschließender Bildanalyse (ImageJ), einem kommerziellen Auslesegerät sowie einer manuellen Auslesung mit Hilfe von Farbtabellen verglichen. Das Gerät kann die Streifen zuverlässig auslesen und die Daten über die RFID-Schnittstelle übertragen. Die funkbasierte Ausleseeinheit ist mit verschiedenen kommerziellen Teststreifen sowohl im biodiagnostischen (lateral flow tests) wie auch im chemischen Bereich (pH-Wert) kompatibel. Die modulare Lösung erlaubt ein breites Einsatzgebiet und führt dadurch zu reduzierten Trainingszeiten der Anwender und einer zuverlässigen Handhabung. Die vorgestellte Lösung ist äußerst kostengünstig und bedarf keiner Wartung, wodurch sie sich sehr gut für den Einsatz in abgelegenen Feldkrankenhäusern eignet. Es wurde ein skalierbarer Prototyp entwickelt, der auf konventionellen Herstellungsverfahren der Verpackungsindustrie aufbaut. Aktuell handelt es sich noch um einen bogenbasierten Prozess, der sich aber prinzipiell auch auf Rolle-zu-Rolle Maschinen übertragen lässt. Bei der Entwicklung des Geräts spielte die Möglichkeit der lokalen Herstellung in den Einsatzländern eine große Rolle. Diese hätte neben der Generierung von Arbeitsplätzen auch den Vorteil einer einfacheren Verteilung der Geräte in ländliche Regionen, in denen sie den größten Nutzen für die Diagnostik erzielen würden.
Unstable magnetohydrodynamical continuous spectrum of accretion disks. A new route to magnetohydrodynamical turbulence in accretion disks
Creators: name: Blokland, J. W. S.
name: Keppens, R.
name: Goedbloed, J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed study of localised magnetohydrodynamical (MHD) instabilities occuring in two--dimensional magnetized accretion disks. We model axisymmetric MHD disk tori, and solve the equations governing a two--dimensional magnetized accretion disk equilibrium and linear wave modes about this equilibrium. We show the existence of novel MHD instabilities in these two--dimensional equilibria which do not occur in an accretion disk in the cylindrical limit. The disk equilibria are numerically computed by the FINESSE code. The stability of accretion disks is investigated analytically as well as numerically. We use the PHOENIX code to compute all the waves and instabilities accessible to the computed disk equilibrium. We concentrate on strongly magnetized disks and sub--Keplerian rotation in a large part of the disk. These disk equilibria show that the thermal pressure of the disk can only decrease outwards if there is a strong gravitational potential. Our theoretical stability analysis shows that convective continuum instabilities can only appear if the density contours coincide with the poloidal magnetic flux contours. Our numerical results confirm and complement this theoretical analysis. Furthermore, these results show that the influence of gravity can either be stabilizing or destabilizing on this new kind of MHD instability. In the likely case of a non--constant density, the height of the disk should exceed a threshold before this type of instability can play a role. This localised MHD instability provides an ideal, linear route to MHD turbulence in strongly magnetized accretion disk tori.
description: 20 pages, 10 figures, accepted for publication in Astronomy & Astrophysics
A brief survey of LISA sources and science
Creators: name: Hughes, Scott A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly $(0.03 - 0.1) {\rm mHz} \lesssim f \lesssim 0.1 {\rm Hz}$. This is expected to be an extremely rich chunk of the GW spectrum -- observing these waves will provide a unique view of dynamical processes in astrophysics. Here we give a quick survey of some key LISA sources and what GWs can uniquely teach us about these sources. Particularly noteworthy science which is highlighted here is the potential for LISA to track the moderate to high redshift evolution of black hole masses and spins through the measurement of GWs generated from massive black hole binaries (which in turn form by the merger of galaxies and protogalaxies). Measurement of these binary black hole waves has the potential to determine the masses and spins of the constituent black holes with percent-level accuracy or better, providing a unique high-precision probe of an aspect of early structure growth. This article is based on the ``Astrophysics Tutorial'' talk given by the author at the Sixth International LISA Symposium.
description: 8 pages, 2 figures, for the Proceedings of the Sixth International LISA Symposium. Particularly silly typo in one equation fixed
Η εικόνα του Μεγάλου Αλεξάνδρου στη νεοελληνική βιβλιογραφία (19ος-20ος αι.): α)ιστορικά έργα, β)λογοτεχνικά κείμενα, σχολικά εγχειρίδια, βιβλία γνώσεων
Creators: name: Καψωμάνης, Θεοφάνης Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004

description: Η έρευνα αυτή στοχεύει στη μελέτη του τρόπου προσέγγισης απ'τη νεοελληνική βιβλιογραφία του Μ. Αλεξάνδρου ώστε να διαπιστωθεί η εικόνα του στην ελληνική κοινωνία και ο τρόπος και οι αιτίες σχηματισμού της. Στο Α' μέρος μελετώνται τα ιστορικά έργα(μονογραφίες, ιστορίες αρχαίας Ελλάδας και Μακεδονίας, ειδικές και γενικές μελέτες συνολικά 99 έργα) και στο β΄ τα μη ιστορικά(λογοτεχνικά έργα, σχολικά εγχειρίδια,βιβλία γνώσεων, 90 έργα). Η μελέτη καθενός βιβλίου βασίζεται στο πως προσεγγίζει τα 7 προβληματικά σημεία της ιστορίας του(προσωπικότητά του και μεταβολή της στην Ασία, ικανότητα ως πολιτικού και στρατηγού, σημασία για τον ελληνισμό και την παγκόσμια ιστορία, τρόπος θανάτου, θέση του στον ελληνικό κόσμο του 4ου αι. π.χ., ελληνικότητα της Μακεδονίας), παράλληλα με την ένταξή του στα ιστορικά συμφραζόμενα της εποχής του και στη διαμόρφωση και τις επιρροές του συγγραφέα. Μόνο το 1/3 συγγραφέων είναι ιστορικοί, από τους υπόλοπους οι περισσότεροι είναι εκπαιδευτικοί, αρκετοί στρατιωτικοί, ενώ υπάρχουν κι άλλοι λόγιοι, χωρίς ιστορική παιδεία οι πιο πολλοί(κάτι που προκαλεί προβλήματα στα έργα τους). Τα περισσότερα κυκλοφορούν στο β' μισό του 20ου αι. Ο Αλέξανδρος, που έχει τελικά μελετηθεί και παρουσιαστεί περισσότερο από κάθε άλλη προσωπικότατα του ελληνικού παρελθόντος, παρουσιάζεται ως πρότυπ Ελληνα, ιδεώδης πολεμικός ήρωας, μεγάλος πολιτικός και εκπλιτιστής, ενώ είναι έντονη κι η προσπάθεια αναίρεσης των εναντίων του κατηγοριών
description: We study the ways greek bibliography approaches Alexander the Great, so that we can find his image in greek society and how and why it's formed. In part I, we study the historical books and in part 2 litterature books, historical textbooks and educational books. Alexander has been studied more than any other personality of the greek past. He is presented as the model of a Greek, as the ideal was hero, as great politician and the man who civilized Asia. The Greek writers are trying also to revoke the accusations against him