cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Multiple jet interactions with special relevance to recovery boilers
Creators: name: Tse, Daniel C.M.
Publisher: name: University of British Columbia
Year: 2009

description: The problem of multiple turbulent jet interactions is investigated with special attention to applications in kraft recovery boilers. The phenomena due to turbulence are simulated with the k-ε turbulence model, and a multigrid numerical technique is applied to solve the time-averaged Navier-Stokes equations governing the flows. Investigations carried out include a study on the simulation of primary level jets and on the characteristics of a row of jets discharging into a confined crossflow. For the primary level jets, the interaction and merging of the jets are investigated. The jets merge rapidly and a suitable open slot representation gives an adequate description of the velocity field. For jets in a row interacting with a confined crossflow, the effects of varying the jet spacing on flow characteristics are investigated. At moderate spacing, the penetration decreases as the spacing is reduced. It is also observed that the vorticity structures of a jet within the row can be substantially different from those of an isolated jet. The penetration of rectangular jets from orifices having different aspect ratios is then studied. A quantitative analysis is carried out to examine the extent of mixing between the jets and the crossflow. The applicability of a correlation by Holdeman and his co-workers is extended to rectangular jets. The correlation yields information on the penetration at various values of jet spacing, confinement size, and jet-to-crossflow momentum ratio. Holdeman’s correlation is also found to be applicable to a crossflow having a peaked non-uniformity in the velocity profile. The use of Holdeman’s correlation indicates that, for a given mass flow from the jets, large jets at a low momentum can penetrate as far as smaller jets at a higher momentum. Furthermore, because of their low momentum, these large jets introduce a lower degree of flow non-uniformity in the mainstream.
Potential origin of the state-dependent high-energy tail in the black hole microquasar Cygnus X-1 as seen with INTEGRAL
Creators: name: Cangemi, F.
name: Beuchert, T.
name: Siegert, T.
name: Rodriguez, J.
name: Grinberg, V.
name: Belmont, R.
name: Gouiffès, C.
name: Kreykenbohm, I.
name: Laurent, P.
name: Pottschmidt, K.
name: Wilms, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: 0.1-10 MeV observations of the black hole microquasar Cygnus X-1 have shown the presence of a spectral feature in the form of a power law in addition to the standard black body and Comptonization components observed by INTEGRAL. This so-called "high-energy tail" has recently been shown to be strong in its hard spectral state and interpreted as high-energy part of the emission from a compact jet. This result was, however, obtained from a data set dominated by hard state observations. In the soft state, only upper limits on the presence and hence the potential parameters of a high-energy tail could be derived. Using an extended data set we aim at obtaining better constraints on the properties of this spectral component in both states. We make use of data obtained from 15 years of observations with the INTEGRAL satellite. The data set is separated into the different states and we analyse stacked state-resolved spectra obtained from the X-ray monitors, the gamma-ray imager, and the gamma-ray spectrometer onboard. A high-energy component is detected in both states confirming its earlier detection in the hard state and its suspected presence in the soft state with INTEGRAL. We first characterize the high-energy tail components in the two states through a model-independent, phenomenological analysis. We then apply physical models based on hybrid Comptonization. The spectra are well modeled in all cases, with a similar goodness of the fits. While in the phenomenological approach the high-enery tail has similar indices in both states, the fits with the physical models seem to indicate different properties. We discuss the potential origins of the high-energy components in both states, and favor an interpretation where the part of the high-energy component is due to a compact jet in the hard state and hybrid Comptonization in either a magnetised or non-magnetised corona in the soft state.
description: 14 pages, 8 figures. Accepted for a publication in A&A
title: Erste funktionelle Ergebnisse eines binokularen diffraktiven, trifokalen Intraokularlinsensystems mit Continuous-Phase-Design zur Verbesserung der Sehleistung im Nah- und Intermediärbereich
Creators: name: Köppe, Maximilian K.H.
name: Stengele, A.
name: Son, H.-S.
name: Auffarth., G.U.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Evaluation der klinischen Ergebnisse eines trifokalen (MIOL), diffraktiven binokularen Intraokularlinsen Systems (Artis Symbiose), wobei jeweils eine Linse ein progressives Tiefenschärfeprofil für intermediäres Sehen (Artis Mid) und nahes Sehen (Artis Plus) aufweist. [zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Rolling down from the 30 keV peak: modelling the hard X-ray and gamma-ray backgrounds
Creators: name: Comastri, Andrea
name: Gilli, Roberto
name: Hasinger, Guenther
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We will briefly discuss the importance of sensitive X-ray observations above a few tens of keV for a better understanding of the physical mechanisms associated to the Supermassive Black Hole primary emission in both radio quiet and radio loud AGN and to the cosmological evolution of the most obscured sources.
description: 8 pages, 3 figures. Invited talk at the meeting "Gamma Wave 2005", Bonifacio, September 2005. To be published in "Experimental Astronomy"
Primordial black holes formation in the inflationary model with field-dependent kinetic term for quartic and natural potentials
Creators: name: Solbi, Milad
name: Karami, Kayoomars
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Within the framework of inflationary model with field-dependent kinetic term for quartic and natural potentials, we investigate generation of the primordial black holes (PBHs) and induced gravitational waves (GWs). In this setup, we consider a kinetic function as $G(ϕ)=g_I(ϕ)\big(1+g_{II}(ϕ)\big)$ and show that in the presence of first term $g_I(ϕ)$ both quartic and natural potentials, in contrast to the standard model of inflation, can be consistent, with the 68\% CL of Planck observations. Besides, the second term $g_{II}(ϕ)$ can cause a significant enhancement in the primordial curvature perturbations at the small scales which results the PBHs formation. For the both potentials, we obtain an enhancement in the scalar power spectrum at the scales $k\sim10^{12}~\rm Mpc^{-1}$, $10^{8}~\rm Mpc^{-1}$, and $10^{5}~\rm Mpc^{-1}$, which causes PBHs production in mass scales around $10^{-13}M_{\odot}$, $10^{-5}M_{\odot}$, and $10 M_{\odot}$, respectively. Observational constraints confirm that PBHs with a mass scale of $10^{-13}M_{\odot}$ can constitute the total of dark matter in the universe. Furthermore, we estimate the energy density parameter of induced GWs which can be examined by the observation. Also we conclude that it can be parametrized as a power-law function $Ω_{\rm GW}\sim (f/f_c)^n$, where the power index equals $n=3-2/\ln(f_c/f)$ in the infrared limit $f\ll f_{c}$.
description: 25 pages, 7 figures, 5 tables
Discrete Memoryless Interference and Broadcast Channels with Confidential Messages: Secrecy Rate Regions
Creators: name: Liu, Ruoheng
name: Maric, Ivana
name: Spasojevic, Predrag
name: Yates, Roy D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We study information-theoretic security for discrete memoryless interference and broadcast channels with independent confidential messages sent to two receivers. Confidential messages are transmitted to their respective receivers with information-theoretic secrecy. That is, each receiver is kept in total ignorance with respect to the message intended for the other receiver. The secrecy level is measured by the equivocation rate at the eavesdropping receiver. In this paper, we present inner and outer bounds on secrecy capacity regions for these two communication systems. The derived outer bounds have an identical mutual information expression that applies to both channel models. The difference is in the input distributions over which the expression is optimized. The inner bound rate regions are achieved by random binning techniques. For the broadcast channel, a double-binning coding scheme allows for both joint encoding and preserving of confidentiality. Furthermore, we show that, for a special case of the interference channel, referred to as the switch channel, the two bound bounds meet. Finally, we describe several transmission schemes for Gaussian interference channels and derive their achievable rate regions while ensuring mutual information-theoretic secrecy. An encoding scheme in which transmitters dedicate some of their power to create artificial noise is proposed and shown to outperform both time-sharing and simple multiplexed transmission of the confidential messages.
description: to appear Special Issue of IEEE Transactions on Information Theory on Information Theoretic Security
title: Diffraktiver Überblendvisus mit einer diffraktiven EDOF und einer trifokalen multifokalen Intraokularlinse (Trifo + Vision)
Creators: name: Lücht, David
name: Breyer, D.R.H.
name: Kaymak, H.
name: Klabe, K.
name: Kirca, M.
name: Becker, L.
name: Kretz, F.T.A.
name: Auffarth, G.U.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Vergleich des diffraktiven Überblendvisus-Effektes nach einer Kataraktoperation mit Implantation einer diffraktiven EDOF-Intraokularlinse (IOL) und einer trifokalen multifokalen IOL (MIOL). Methoden: Wir analysierten retrospektiv den diffraktiven Überblendvisus-Effekt mit[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Effective single-particle order-N scheme for the dynamics of open non-interacting many-body systems
Creators: name: Pershin, Yu. V.
name: Dubi, Y.
name: Di Ventra, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum master equations are common tools to describe the dynamics of many-body systems open to an environment. Due to the interaction with the latter, even for the case of non-interacting electrons, the computational cost to solve these equations increases exponentially with the particle number. We propose a simple scheme, that allows to study the dynamics of $N$ non-interacting electrons taking into account both dissipation effects and Fermi statistics, with a computational cost that scales linearly with $N$. Our method is based on a mapping of the many-body system to a specific set of effective single-particle systems. We provide detailed numerical results showing excellent agreement between the effective single-particle scheme and the exact many-body one, as obtained from studying the dynamics of two different systems. In the first, we study optically-induced currents in quantum rings at zero temperature, and in the second we study a linear chain coupled at its ends to two thermal baths with different (finite) temperatures. In addition, we give an analytical justification for our method, based on an exact averaging over the many-body states of the original master equations.
description: 9 pages, 8 figures. Expanded version, additional examples added
Stable circular orbits in caged black hole spacetimes
Creators: name: Igata, Takahisa
name: Tomizawa, Shinya
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the motion of massive and massless particles in a five-dimensional spacetime with a compactified extra-dimensional space where a black hole is localized, i.e., a caged black hole spacetime. We show the existence of circular orbits and reveal their sequences and stability. In the asymptotic region, stable circular orbits always exist, which implies that four-dimensional gravity is more dominant because of the small extra-dimensional space. In the vicinity of a black hole, they do not exist because the effect of compactification is no longer effective. We also clarify the dependence of the sequences of circular orbits on the size of the extra-dimensional space by determining the appearance of the innermost stable circular orbit and the last circular orbit (i.e., the unstable photon circular orbit).
description: 13 pages, 2 figures; v2: minor revision, add references; v3: published version
Η Επίδραση της Εκπαίδευσης στην Οικονομική Μεγέθυνση των χωρών του ΟΟΣΑ
Creators: name: Νούλη, Αθηνά Σταύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Οικονομική Μεγέθυνση
ΟΟΣΑ (Οργανισμός Οικονομικής Συνεργασίας και Ανάπτυξης)
Κυβερνητικές Δαπάνες για την Εκπαίδευση
Γενικευμένη Μέθοδος των Ροπών
Παλινδρόμηση
Economic Growth
OECD (Organisation for Economic Co-operation and Development)
Government Expenditure on Education (Generalized Method of moments)
GMM
Regression

description: Η σχέση ανάμεσα στην εκπαίδευση και την οικονομική μεγέθυνση διερευνάται θεωρητικά και εμπειρικά από την δεκαετία του 1970, ωστόσο υπάρχουν αντιφατικά ευρήματα αναφορικά με τον ρόλο που διαδραματίζει η πρώτη στην μεγέθυνση των οικονομιών. Ένα ευρύ φάσμα των οικονομετρικών μελετών δείχνουν ότι στην πλειοψηφία οι ερευνητές έχουν στρέψει το ενδιαφέρον τους κυρίως στις αναπτυσσόμενες χώρες και λιγότερο στις ανεπτυγμένες. Σκοπός της παρούσας μελέτης είναι να παρέχει μία καθαρή εικόνα της επίδρασης των κυβερνητικών δαπανών για την εκπαίδευση στην οικονομική μεγέθυνση των κρατών – μελών του ΟΟΣΑ, κατά τη χρονική περίοδο 1995 – 2015. Για την διερεύνηση της σχέσης αυτής γίνεται χρήση της Γενικευμένης Μεθόδου Ροπών Συστήματος (GMM), η οποία καταλήγει σε τρία επιμέρους υποδείγματα, εκτιμάται δηλαδή σε διαφορετικές εξειδικεύσεις του υποδείγματος και πιο συγκεκριμένα, υποθέτοντας δύο υστερήσεις τόσο για την ανεξάρτητη όσο και για τις μεταβλητές που αποτελούν τι επεξηγηματικές μεταβλητές, αλλά και τρεις υστερήσεις για κάθε μία από τις προαναφερθείσες. Εκτελείται ακόμη το J τεστ υπέρ-ταυτοποιημένων περιορισμών για να ελεγχθεί εάν οι συνθήκες των ροπών ή αλλιώς συνθήκες ορθωγονικότητας προσαρμόζονται καλά στα στοιχεία μας ή όχι καθώς επίσης και το τεστ του Hausman για τον έλεγχο της ενδογένειας. Η έρευνα καταλήγει στο συμπέρασμα ύπαρξης μιας θετικής σχέσης μεταξύ των κυβερνητικών επενδύσεων στον τομέα της εκπαίδευσης και την μεγέθυνση των υπό εξέταση οικονομιών
description: The relationship between education and economic growth has been theoretically and empirically explored since the 1970s, but there are contradictory findings with regard to the role that the former plays in the growth of economies. A wide range of econometric studies show that the majority of researchers have turned their interest mainly in developing countries and less developed. The purpose of this study is to provide a clear picture of the impact of government spending on education on the economic growth of OECD member states over the period 1995-2015. In order to investigate this relationship, the Generalized System of Momentum (GMM) is used, which concludes in three sub-models, The J-test of over-identified limitations is also carried out to check whether the conditions of torques or conditions of orthogonality are well adapted to our elements or not, as well as the Hausman test for endogenous control. The research concludes that there is a positive relationship between government investment in education and the growth of the economies under consideration
Computer control of a hydraulic press brake
Creators: name: Lane, John Alexander
Publisher: name: University of British Columbia
Year: 2009

description: Hydraulic press brakes are widely used in industry to form sheet metal into various shapes using bending operations. When the press brake is controlled by a Computer Numerical Control (CNC) unit, the desired bend can be achieved without the use of mechanical gages or manual adjustments, leading to increased flexibility and accuracy in the manufactured components. In this thesis, a single axis hydraulic press brake is retrofitted for dual axis CNC control. The ram is positioned using two parallel hydraulic cylinder type actuators. One servo-valve and amplifier is dedicated to each actuator so that the motion of each axis can be independently controlled by the CNC unit. Each actuator is instrumented with linear optical encoders which provide feedback for closed-loop servo position control. The hydraulic system is modified to provide constant pressure fluid power to the servo valves. An accumulator is used between the pump and the valves to suppress pressure fluctuations. Pressure transducers are integrated into the ports of the actuator to monitor the pressure during the operation of the press. The dynamics of the hydraulic servo system, including the valves, actuators and the ram are modeled. A non-linear model, which includes the influences of piston position, is presented. A simplified model is shown to be adequate provided that the practical ranges of the piston position is considered. The mathematical model is used to experimentally determine the dynamics using parametric identification techniques. The well-damped system is approximated by a first order system with substantial delay between the servo-valve amplifier command and the actuator piston motion. A readily available CNC system is retrofitted to the press brake and a delay compensating pole placement digital control system is developed and implemented for the independent control of two actuators. The performance of the system is evaluated for a series of forming operations. This thesis provides basic guidelines for the design and analysis of hydraulically actuated CNC presses.
Hadron Optics in Three-Dimensional Invariant Coordinate Space from Deeply Virtual Compton Scattering
Creators: name: Brodsky, S. J.
name: Chakrabarti, D.
name: Harindranath, A.
name: Mukherjee, A.
name: Vary, J. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Fourier transform of the deeply virtual Compton scattering amplitude (DVCS) with respect to the skewness parameter ζ= Q^2/ 2 p.q can be used to provide an image of the target hadron in the boost-invariant variable σ, the coordinate conjugate to light-front time τ=t+ z/ c. As an illustration, we construct a consistent covariant model of the DVCS amplitude and its associated generalized parton distributions using the quantum fluctuations of a fermion state at one loop in QED, thus providing a representation of the light-front wavefunctions of a lepton in σspace. A consistent model for hadronic amplitudes can then be obtained by differentiating the light-front wavefunctions with respect to the bound-state mass. The resulting DVCS helicity amplitudes are evaluated as a function of σand the impact parameter \vec b_\perp, thus providing a light-front image of the target hadron in a frame-independent three-dimensional light-front coordinate space. Models for the LFWFs of hadrons in (3+1) dimensions displaying confinement at large distances and conformal symmetry at short distances have been obtained using the AdS/CFT method. We also compute the LFWFs in this model in invariant three dimensional coordinate space. We find that in the models studied, the Fourier transform of the DVCS amplitudes exhibit diffraction patterns. The results are analogous to the diffractive scattering of a wave in optics where the distribution in σmeasures the physical size of the scattering center in a one-dimensional system.
description: minor modification to text, preprint number updated
title: Die 10 Regeln der miLens-Strategie zur Korrektur der Presbyopie mit Intraokularlinsen
Creators: name: Breyer, Detlev R.H.
name: Kaymak, H.
name: Klabe, K.
name: Kirca, M.
name: Beckers, L.
name: Lücht, D.
name: Kretz, F.T.A.
name: Auffarth, G.U.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Trotz der Tatsache, dass nahezu jeder Patient nach einer Intraokularlinsen (IOL)-Operation gerne ohne Brille sehen würde, sind nur 1–5 % der implantierten IOL multifokale IOL (MIOL) oder Extended-Depth-of-Focus-(EDOF)-IOL. Außerdem sind MIOL für die meisten IOL-Explantationen[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Ο ρόλος του αρχαιολογικού θέματος στη μοντέρνα και σύγχρονη ελληνική ζωγραφική
Creators: name: Καρτάλη, Ναταλία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Αρχαιολογικό θέμα
Ελληνική ζωγραφική
Ερειπιογραφία
Archaeological subject
Greek painting
Ancient ruins’ depiction

description: Σκοπός της Μεταπτυχιακής Διπλωματικής Εργασίας ήταν η μελέτη του λόγου για τον οποίο έλληνες ζωγράφοι από το 1897 μέχρι το 2017 άντλησαν την έμπνευσή τους από έργα της κλασικής Αρχαιότητας και τα ενέταξαν στη δημιουργία τους. Εξετάστηκαν φορητοί πίνακες, τοιχογραφίες και υδατογραφίες. Το υλικό ταξινομήθηκε σε τρεις κύριες ομάδες: στοιχεία από την αρχιτεκτονική, στοιχεία από τη γλυπτική και άλλες πηγές, με επιμέρους ομαδοποιήσεις. Στη συνέχεια παρουσιάστηκαν τα ιδιαίτερα χαρακτηριστικά των έργων που επιλέχθηκαν. Μέσα από την ποικιλία του υλικού επιχειρήθηκε να αποδοθεί η πολλαπλότητα των αναζητήσεων σε σχέση με το θέμα. Τέλος, ένα άλλο θέμα που θίχθηκε ήταν η απουσία του αρχαιολογικού θέματος στη σύγχρονη Ελλάδα εν μέσω της οικονομικής κρίσης
description: The aim of the present Postgraduate Diploma Thesis was the study of the reason why greek painters from 1897 until 2017 were inspired from works of Art created during the greek Classical Antiquity and chose to include them in their creations. We examined portable paintings, murals and watercolours. The works of art were assorted in three major groups: elements from architecture, elements from sculpture and elements from various sources, following minor groupings. Through the variety of the works of art, we attempted to show the multiplicity of the artists’ pursuits in relation to the subject. Finally, another issue that was examined was the absence of the archaeological subject in contemporary Greece amid the economic crisis
Gauge Fields as Constrained Composite Bosons
Creators: name: Chkareuli, J. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We reconsider a scenario in which photons and other gauge fields appear as the composite vector bosons made of the fermion pairs that may happen with or without spontaneous violation of Lorentz invariance. The class of composite models for emergent gauge fields is proposed, where these fields are required to be restricted by by the nonlinear covariant constraint of type $ A_{μ}^{2}=M^{2}$. Such a constraint may only appear if the corresponding fermion currents in the prototype model, being invariant under some global internal symmetry $G$, are properly constrained as well. In contrast to the conventional approach, the composite bosons emerged in this way appear naturally massless, the global symmetry $G$ in the model turns into the local symmetry $G_{loc}$, while the vector field constraint reveals itself as the gauge fixing condition. Finally, we consider the case when the constituent fermions generating emergent gauge bosons could be at the same time the preons composing the known quark-lepton species in the Standard Model and Grand Unified Theories.
description: 15 pages, Published version - to appear in Physics Letters B. arXiv admin note: text overlap with arXiv:1305.6898
Additional information for the paper `Attempt to distinguish long range temporal correlations from the statistics of the increments by natural time analysis' after its initial submission on February 25, 2006. Part II, Updated
Creators: name: Varotsos, P. A.
name: Sarlis, N. V.
name: Skordas, E. S.
name: Tanaka, H. K.
name: Lazaridou, M. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: As mentioned in the preceding additional information (hereafter called Part I), a series of strong earthquakes with magnitudes between 5.2 and 5.9-units occurred during the two weeks period: 3 to 19 April, 2006 with epicenters lying at distances 80 to 100 km west of PAT station. Here, we show that the analysis in the natural time of the seismicity that occurred after the Seismic Electric Signals (SES) activity on February 13, 2006, specifies the occurrence time of the initiation of the aforementioned earthquake activity within a narrow range around two days. Furthermore, we provide the most recent information on some points mentioned in the main text.
description: Seven pages, including 7 figures and 1 Table, Additional information for a paper accepted for publication in Phys. Rev. E
title: Multifokale Intraokularlinse mit erweiterter Tiefenschärfe
Creators: name: Schultz, Merita
name: Elling, M.
name: Dick, H.B.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Eine neuartige Intraokularlinse (IOL) kombiniert die optischen Eigenschaften von Multifokallinsen und IOL mit erweiterter Tiefenschärfe. Hierdurch soll eine optimale Sehleistung in allen Entfernungen bei gutem Kontrast ermöglicht werden. Methoden: Bei Patienten mit Katarakt[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
A systematic review on the 30-day and 12-month survival of functional mitral regurgitation patients after percutaneous edge-to-edge mitral valve repair (MitraClip) system
Creators: name: Χατζηγεωργίου, Κωνσταντίνος Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ανεπάρκεια Mιτροειδούς βαλβίδας
Διαδερμική επιδιόρθωση
Mitraclip
Mitral Valve Insuffisiency
Percutaneous repair

description: Η διπλωματική μεταπτυχιακή εργασία με τίτλο "Συστηματική ανασκόπηση για την επιβίωση ασθενών με λειτουργική ανεπάρκεια μιτροειδούς βαλβίδας, ένα μήνα και 12 μήνες μετά τη διαδερμική (edge to edge) επιδιόρθωση μιτροειδούς με το σύστημα Mitraclip" εκπονήθηκε στα πλαίσια του μεταπτυχιακού Ιατρική Ερευνητική Μεθοδολογία της Ιατρική Σχολής του Αριστοτέλειου Πανεπιστήμιου Θεσσαλονίκης. Η λειτουργική ανεπάρκεια μιτροειδούς βαλβίδας είναι μια καρδιακή πάθηση που επηρεάζει την ποιότητα και το προσδόκιμο ζωής εκατομμυρίων ανθρώπων παγκοσμίως. Η συσκευή Mitraclip (Abbot Vascular, Menlo Park, CA) χρησιμοποιείται για την διαδερμική επιδιόρθωση της μιτροειδούς βαλβίδας σε ασθενείς με οργανική ή λειτουργική ανεπάρκεια βασισμένη στη χειρουργική τεχνική "edge to edge" του Alfieri. Ένα σύνολο 1927 δημοσιεύσεων εντοπίστηκαν μετά από έρευνα σε 3 διαδικτυακές βιβλιοθήκες (MEDLINE, CENTRAL και EMBASE) και τελικά 28 δημοσιεύσεις και ένα σύνολο 2383 ασθενών συμπεριλήφθηκαν στη μελέτη. Η παρούσα ερευνητική εργασία εξετάζει τη συνολική εμπειρία της χρήσης του συστήματος διαδερμικής επιδιόρθωσης μιτροειδούς βαλβίδας (Mitraclip) εστιάζοντας στην επιβίωση των ασθενών 1 μήνα και ένα χρόνο μετά την επέμβαση
description: The master thesis entitled "A systematic review on the 30-day and 12-month survival of functional mitral regurgitation patients after percutaneous edge-to-edge mitral valve repair with MitraClip system" was undertaken as the final part of the "Medical Research Methodology" Master program of the Medical School of Aristotle University Thessaloniki for the years 2016-2018. Functional mitral valve regurgitation is a cardiac disease that affects millions of people worldwide, directly influencing their quality of life and their life expectancy. The MitraClip device (Abbott Vascular, Menlo Park, CA) is used for the percutaneous, edge-to-edge reconstruction of the mitral valve in patients with degenerative and functional mitral regurgitation. It is based on the Alfieri's "edge-to-edge" surgical technique. A total of 1927 publications were imported from 3 online databases (MEDLINE, CENTRAL and EMBASE) and finally 28 publications were included in the systematic review with a patient pool of 2383 patients. The current research project aims to examine the overall experience with the use of percutaneous edge-to-edge mitral valve repair system (Mitraclip), focusing in the 1-month and 1-year survival
title: IOL-Optionen bei irregulärer Hornhaut
Creators: name: Mayer, Wolfgang J.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Die irreguläre Hornhaut stellt häufig eine refraktive und chirurgische Herausforderung dar, insbesondere dann, wenn zusätzlich eine Linsentrübung vorliegt und die Linse operiert werden muss [ref:1]. Die Irregularität der Hornhaut kann viele Ursachen haben. Neben degenerativen[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Resonances of Multichannel Systems
Creators: name: Motovilov, Alexander K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We describe structure of the T-matrices, scattering matrices, and Green functions on unphysical energy sheets in multichannel scattering problems with binary channels and in the three-body problem. Based on the explicit representations obtained for the values of T- and S-matrices on the unphysical sheets, we prove that the resonances belonging to an unphysical sheet are just those energies where the correspondingly truncated scattering matrix, taken in the physical sheet, has eigenvalue zero. We show, in addition, that eigenvectors of the truncated scattering matrix associated with its zero eigenvalue are formed of the breakup amplitudes for the respective resonant states.
description: Based on a talk presented at the UNISA-JINR Symposium "Models and Methods in Few- and Many-Body Systems" (6-9 February 2007, Skukuza, Kruger National Park, South Africa
Distributed Mean-Field Density Estimation for Large-Scale Systems
Creators: name: Zheng, Tongjia
name: Han, Qing
name: Lin, Hai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This work studies how to estimate the mean-field density of large-scale systems in a distributed manner. Such problems are motivated by the recent swarm control technique that uses mean-field approximations to represent the collective effect of the swarm, wherein the mean-field density (especially its gradient) is usually used in feedback control design. In the first part, we formulate the density estimation problem as a filtering problem of the associated mean-field partial differential equation (PDE), for which we employ kernel density estimation (KDE) to construct noisy observations and use filtering theory of PDE systems to design an optimal (centralized) density filter. It turns out that the covariance operator of observation noise depends on the unknown density. Hence, we use approximations for the covariance operator to obtain a suboptimal density filter, and prove that both the density estimates and their gradient are convergent and remain close to the optimal one using the notion of input-to-state stability (ISS). In the second part, we continue to study how to decentralize the density filter such that each agent can estimate the mean-field density based on only its own position and local information exchange with neighbors. We prove that the local density filter is also convergent and remains close to the centralized one in the sense of ISS. Simulation results suggest that the centralized suboptimal density filter is able to generate convergent density estimates, and the local density filter is able to converge and remain close to the centralized filter.
description: arXiv admin note: text overlap with arXiv:2009.05366
Gravitomagnetic Stern--Gerlach Force
Creators: name: Mashhoon, Bahram
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A heuristic description of the spin-rotation-gravity coupling is presented and the implications of the corresponding gravitomagnetic Stern--Gerlach force are briefly mentioned. It is shown, within the framework of linearized general relativity, that the gravitomagnetic Stern--Gerlach force reduces in the appropriate correspondence limit to the classical Mathisson spin-curvature force.
description: 20 pages; v2: minor improvements; v3: references added; v4: references [47] and [62] updated
title: Komplikationsprofil der minimalinvasiven Glaukomchirurgie (MIGS)
Creators: name: Erb, Carl
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Die minimalinvasive = mikroinvasive Glaukomchirurgie (MIGS) ist bis jetzt nicht einheitlich definiert, aber sie hat als allgemein anerkannte Gemeinsamkeit einen Ab-interno-Zugang über die Hornhaut. Ob dabei die Bindehaut miteinbezogen wird, wie nach der American Glaucoma Society, oder die [zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
M2 to D2
Creators: name: Mukhi, Sunil
name: Papageorgakis, Constantinos
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the recently proposed "3-algebra" field theory for multiple M2-branes and show that when a scalar field valued in the 3-algebra develops a vacuum expectation value, the resulting Higgs mechanism has the novel effect of promoting topological (Chern-Simons) to dynamical (Yang-Mills) gauge fields. This leads to a precise derivation of the maximally supersymmetric Yang-Mills theory on multiple D2-branes and thereby provides a relationship between 3-algebras and Yang-Mills theories. We discuss the physical interpretation of this result.
description: 1+16 pages, LaTeX; v2: calculation unchanged, interpretation expanded and moved to last section, references added
title: Kanaloplastik ab interno – Verfahren und Ergebnisse
Creators: name: Körber, Norbert
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Seit einigen Jahren gewinnen minimalinvasive glaukomchirurgische Verfahren (MIGS) immer mehr an Bedeutung. Gemeinsam ist ihnen ein minimalinvasiver Zugang mit kleiner Inzision und Präparation ab interno. Eine neue chirurgische Methode ist die Kanaloplastik ab interno. Dieser Eingriff kann mit zwei[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
title: Relationship between immunoglobulin levels, survival and performance of young calves
title: The relationship between immunoglobulin levels, survival and performance of young calves
titleType: AlternativeTitle
Creators: name: Tibenda, Jonas Jonathan
Publisher: name: The University of Edinburgh
Year: 1981
Subjects: subject: Annexe MSc Digitisation Project 2022 Block 47
subject: Immunoglobulin
subject: Calves
subject: Survival
subject: Performance
subject: Seasonal variation

description: Total serum immunoglobulin levels (ZST units and refractometer readings) were determined in 280 bought-in calves grouped in batches of lj.0 and distributed over three different seasons in a four year period. A seasonal variation in serum immunoglobulin levels was noted; the calves purchased in September had higher mean levels (33«3 ZST units) than those purchased in January (17.6 ZST units). The calves were weighed regularly over nine weeks and their growth rates were calculated. Immunoglobulin levels were not significantly correlated with disease incidence, mortality, arrival weight, weaning weight, weight at the end of the trial or growth rate. It was concluded that the determination of immunoglobulin levels in bought-in calves was not a reliable means of predicting calf viability and performance.
title: Erste weltweite Ein-Jahresergebnisse aus Bochum zum minimalinvasiven Beacon-Aqueous-Mikroshunt mit externer Drainage des Kammerwassers direkt auf die Augenoberfläche bei refraktärem Glaukom
Creators: name: Kersten-Gomez, Inga
name: Elling, M.
name: Schultz, T.
name: Böcker, J.
name: Dick, H.B.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Weltweit erste Evaluation der Sicherheit und Effizienz des minimalinvasiven Glaukom-Implantates Beacon-Aqueous-Microshunt von MicrOptx mit externer Drainage des Kammerwassers direkt nach außen in den Tränenfilm. Methoden: Prospektive, monozentrische Machbarkeitsstudie an [zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Binding two and three $α$ particles in cold neutron matter
Creators: name: Moriya, H.
name: Tajima, H.
name: Horiuchi, W.
name: Iida, K.
name: Nakano, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We elucidate the fate of neighboring two and three-$α$ particles in cold neutron matter by focusing on an analogy between such $α$ systems and Fermi polarons realized in ultracold atoms. We describe in-medium excitation properties of an $α$ particle and neutron-mediated two- and three-$α$ interactions using theoretical approaches developed for studies of cold atomic systems. We numerically solve the few-body Schrödinger equation of $α$ particles within standard $α$ cluster models combined with in-medium properties of $α$ particles. We point out that the resultant two-$α$ ground state and three-$α$ first excited state, which correspond to $^8$Be and the Hoyle state, respectively, known as main components in the triple-$α$ reaction, can become bound states in such a many-neutron background although these states are unstable in vacuum. Our results suggest a significance of these in-medium cluster states not only in astrophysical environments such as core-collapsed supernova explosions and neutron star mergers but also in neutron-rich nuclei.
description: 9 pages, 5 figures
title: Drucksenkung durch kombinierte Kataraktoperation mit der Goniotomie I/A
Creators: name: Norkî, Lalo
name: Wirbelauer, C.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Die Goniotomie ermöglicht als MIGS-Verfahren eine Drucksenkung bei milden bis moderaten Glaukomen bei der Kataraktoperation. Durch die Anbindung an ein Irrigation-Aspirationssystem (I/A) kann beim Eingriff die Vorderkammer stabilisiert werden und gleichzeitig eine Absaugung erfolgen.[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Load balancing for distributed nonlocal models within asynchronous many-task systems
Creators: name: Gadikar, Pranav
name: Diehl, Patrick
name: Jha, Prashant K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: In this work, we consider the challenges of developing a distributed solver for models based on nonlocal interactions. In nonlocal models, in contrast to the local model, such as the wave and heat partial differential equation, the material interacts with neighboring points on a larger-length scale compared to the mesh discretization. In developing a fully distributed solver, the interaction over a length scale greater than mesh size introduces additional data dependencies among the compute nodes and communication bottleneck. In this work, we carefully look at these challenges in the context of nonlocal models; to keep the presentation specific to the computational issues, we consider a nonlocal heat equation in a 2d setting. In particular, the distributed framework we propose pays greater attention to the bottleneck of data communication and the dynamic balancing of loads among nodes with varying compute capacity. For load balancing, we propose a novel framework that assesses the compute capacity of nodes and dynamically balances the load so that the idle time among nodes is minimal. Our framework relies heavily on HPX library, an asynchronous many-task run time system. We present several results demonstrating the effectiveness of the proposed framework.
Hidden Symmetries in Deformed Very Special Relativity
Creators: name: Dimakis, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study particle dynamics in a space-time invariant under the $DISIM_b(2)$ group - the deformation of the $ISIM(2)$ symmetry group of very special relativity. We find that the Lorentz violation leads to the creation of higher order (hidden) symmetries which are connected to those broken at the space-time level. Through the perspective of the conserved quantities of the special relativistic case the Lorentz violation is linked to specific non-commutative relations in phase-space.
description: 6 pages, no figures, Latex2e source file, minor changes to match published version
Entanglement and optimal strings of qubits for memory channels
Creators: name: Karimipour, V.
name: Memarzadeh, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the problem of enhancement of mutual information by encoding classical data into entangled input states of arbitrary length and show that while there is a threshold memory or correlation parameter beyond which entangled states outperform the separable states, resulting in a higher mutual information, this memory threshold increases toward unity as the length of the string increases. These observations imply that encoding classical data into entangled states may not enhance the classical capacity of quantum channels.
description: 14 pages, 8 figures, latex, accepted for publication in Physical Review A
title: Optimierung der Implantation des Ahmed-Ventils über einen skleralen Deckel
Creators: name: Berg, Robert
name: Wirbelauer, C.
Publisher: name: German Medical Science GMS Publishing House
Year: 2021
Subjects: subject: 610 Medical sciences; Medicine

description: Hintergrund: Das Ahmed-Ventil ist eine technisch anspruchsvolle Operation zur Behandlung fortgeschrittener Glaukome. Dabei ist, neben der Selektion eines geeigneten Patientenkollektivs und einem einwandfrei funktionierenden Implantat, die Operationstechnik maßgeblich für das postoperative [zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 35. Kongress der Deutschsprachigen Gesellschaft für Intraokularlinsen-Implantation, interventionelle und refraktive Chirurgie
Bulk viscous matter and the cosmic acceleration of the universe in $f(Q,T)$ gravity
Creators: name: Arora, Simran
name: Pacif, S. K. J.
name: Parida, Abhishek
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We have studied bulk viscosity in the modified $f(Q, T)$ gravity theory formalism, where $Q$ represents the non-metricity and $T$ denotes the trace of energy-momentum tensor within a flat Friedmann-Lemaître-Robertson-Walker metric (FLRW). Here, we have explicitly considered the effective equation of state, which includes a bulk viscosity term, and obtained the exact solutions by assuming a specific form of $f(Q, T)=αQ+βT$, where $α$ and $β$ are constants. Furthermore, we have found constraints on the model parameters with some external datasets, such as the revised Hubble datasets consisting of 57 data points, Baryon acoustic oscillations (BAO) datasets, and the newly published Pantheon samples with 1048 points to obtain the best fitting values of the model parameters. The obtained model is found to be in good agreement with observations. In addition, we have analyzed the cosmological behavior of the density parameter, the equation of state (EoS) parameter ($ω$), and the deceleration parameter ($q$). The results are satisfying to the standard scenario of recent findings of cosmology. The universe appears to be evolving from a decelerated to an accelerated phase. The EoS parameter is further in the quintessence phase, indicating that the universe is accelerating. Finally, we can deduce that the accumulation of bulk viscosity as effective dark energy supports the current accelerated expansion of the universe.
description: Revised version
Normalized entropy density of the 3D 3-state Potts model
Creators: name: Bazavov, Alexei
name: Berg, Bernd A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using a multicanonical Metropolis algorithm we have performed Monte Carlo simulations of the 3D 3-state Potts model on $L^3$ lattices with L=20, 30, 40, 50. Covering a range of inverse temperatures from $β_{\min}=0$ to $β_{\max}=0.33$ we calculated the infinite volume limit of the entropy density $s(β)$ with its normalization obtained from $s(0)=\ln 3$. At the transition temperature the entropy and energy endpoints in the ordered and disordered phase are estimated employing a novel reweighting procedure. We also evaluate the transition temperature and the order-disorder interface tension. The latter estimate increases when capillary waves are taken into account.
description: 5 pages, 4 figures