cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exact coherent structures and phase space geometry of pre-turbulent 2D active nematic channel flow
Creators: name: Wagner, Caleb G.
name: Norton, Michael M.
name: Park, Jae Sung
name: Grover, Piyush
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Dynamical Systems (math.DS)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Confined active nematics exhibit rich dynamical behavior, including spontaneous flows, periodic defect dynamics, and chaotic `active turbulence'. Here, we study these phenomena using the framework of Exact Coherent Structures, which has been successful in characterizing the routes to high Reynolds number turbulence of passive fluids. Exact Coherent Structures are stationary, periodic, quasiperiodic, or traveling wave solutions of the hydrodynamic equations that, together with their invariant manifolds, serve as an organizing template of the dynamics. We compute the dominant Exact Coherent Structures and connecting orbits in a pre-turbulent active nematic channel flow, which enables a fully nonlinear but highly reduced order description in terms of a directed graph. Using this reduced representation, we compute instantaneous perturbations that switch the system between disparate spatiotemporal states occupying distant regions of the infinite dimensional phase space. Our results lay the groundwork for a systematic means of understanding and controlling active nematic flows in the moderate to high activity regime.
Quasi-TEM modes in rectangular waveguides: a study based on the properties of PMC and hard surfaces
Creators: name: Pierre, Raphaël
name: Tayeb, Gérard
name: Gralak, Boris
name: Enoch, Stefan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Hard surfaces or magnetic surfaces can be used to propagate quasi-TEM modes inside closed waveguides. The interesting feature of these modes is an almost uniform field distribution inside the waveguide. But the mechanisms governing how these surfaces act, how they can be characterized, and further how the modes propagate are not detailed in the literature. In this paper, we try to answer these questions. We give some basic rules that govern the propagation of the quasi-TEM modes, and show that many of their characteristics (i.e. their dispersion curves) can be deduced from the simple analysis of the reflection properties of the involved surfaces.
Mulford House Barn, James Lane
Creators: name: Weber, Harvey A.
Publisher: name: Unknown
Year: 1970
Subjects: Photographs
Photos
Historic buildings
East Hampton
Structures
Barns
Mulford Family

description: This images shows the barn outside the Mulford House located on James Lane. This image was taken by photographer Harvey A. Weber (1917-1991) and is part of the East Hampton’s Heritage Photo Collection.
description: Images within East Hampton Heritage Photo Collection seem to have been taken or collected in relation to the East Hampton Heritage project, but not all of them were included in the final publication. Several photographer are included in this collection.
The World in Schematics Volume 1
Creators: name: Huda, Sokhi
Publisher: name: Zenodo
Year: 2021
Subjects: World
Schematics
Reflection
Nice point

description: This volume 1 of the presentation slide is a collection of 24 schemes from 14 articles and conference papers. The author deliberately entitled this collection "The World in Schematics" to facilitate identification of the uniqueness of the idea. The argument that is built is that a scientific explanation of the world can be systematically simplified into a schematic form. Each part begins with the work's identity and nice point. A nice point (NP) is a brief and reflective description of the results of a particular study or research. The language packaging is efficient and effective with the most important diction that the researcher wants to give. NP shows the richness of diction, the breadth of reading insight, mastery of research results, as well as the ability to reflect a writer. In this condition, NP is like a string of pearls in the integrity of the author's idea of a problem.
C-essential surfaces in (3-manifold, graph) pairs
Creators: name: Taylor, Scott
name: Tomova, Maggy
Publisher: name: arXiv
Year: 2009
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M27, 57M50

description: Let $T$ be a graph in a compact, orientable 3--manifold $M$ and let $Γ$ be a subgraph. $T$ can be placed in bridge position with respect to a Heegaard surface $H$. We show that if $H$ is what we call $(T,Γ)$-c-weakly reducible in the complement of $T$ then either a "degenerate" situation occurs or $H$ can be untelescoped and consolidated into a collection of "thick surfaces" and "thin surfaces". The thin surfaces are c-essential (c-incompressible and essential) in the graph exterior and each thick surface is a strongly irreducible bridge surface in the complement of the thin surfaces. This strengthens and extends previous results of Hayashi-Shimokawa and Tomova to graphs in 3-manifolds that may have non-empty boundary.
description: 33 pages, 9 figures. Accepted for publication in Communications in Analysis and Geometry
SymTFT for (3+1)d Gapless SPTs and Obstructions to Confinement
Creators: name: Antinucci, Andrea
name: Copetti, Christian
name: Schafer-Nameki, Sakura
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study gapless phases in (3+1)d in the presence of 1-form and non-invertible duality symmetries. Using the Symmetry Topological Field Theory (SymTFT) approach, we classify the gapless symmetry-protected (gSPT) phases in these setups, with particular focus on intrinsically gSPTs (igSPTs). These are symmetry protected critical points which cannot be deformed to a trivially gapped phase without spontaneously breaking the symmetry. Although these are by now well-known in (1+1)d, we demonstrate their existence in (3+1)d gauge theories. Here, they have a clear physical interpretation in terms of an obstruction to confinement, even though the full 1-form symmetry does not suffer from 't Hooft anomalies. These igSPT phases provide a new way to realize 1-form symmetries in CFTs, that has no analog for gapped phases. The SymTFT approach allows for a direct generalization from invertible symmetries to non-invertible duality symmetries, for which we study gSPT and igSPT phases as well. We accompany these theoretical results with concrete physical examples realizing such phases and explain how obstruction to confinement is detected at the level of symmetric deformations.
description: 39 pages, 2 appendices. v2: clarified physical meaning of igSPTs for 1-form symmetries. v3: clarified several points, typos fixed, reference added
Hadron and Photon Production in the Forward Region at RHIC and LHC
Creators: name: Betemps, M. A.
name: Goncalves, V. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we investigate the hadron and photon production at forward rapidities in $pp$ and $pA$ collisions considering two phenomenological models based on the Color Glass Condensate formalism. The predictions of these models for the hadron spectra are compared with the dAu and pp RHIC data and the nuclear modification factor $R_{hA}$ is estimated. Our results demonstrate that the analysis of the transverse momentum dependence of this factor allows to discriminate between the phenomenological models. Furthermore, we predict $R_{hA}$ for photon production at forward rapidities at RHIC and LHC energies and study the $p_T$ dependence of the photon to pion production ratio.
description: 17 pages, 6 figures. Version to be published in JHEP
The critical layer in pipe flow at high Reynolds number
Creators: name: Viswanath, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We report the computation of a family of traveling wave solutions of pipe flow up to $Re=75000$. As in all lower-branch solutions, streaks and rolls feature prominently in these solutions. For large $Re$, these solutions develop a critical layer away from the wall. Although the solutions are linearly unstable, the two unstable eigenvalues approach 0 as $Re\to\infty$ at rates given by $Re^{-0.41}$ and $Re^{-0.87}$ -- surprisingly, the solutions become more stable as the flow becomes less viscous. The formation of the critical layer and other aspects of the $Re\to\infty$ limit could be universal to lower-branch solutions of shear flows. We give implementation details of the GMRES-hookstep and Arnoldi iterations used for computing these solutions and their spectra, while pointing out the new aspects of our method.
Sine-square deformation applied to classical Ising models
Creators: name: Hotta, Chisa
name: Nakamaniwa, Takashi
name: Nakamura, Tota
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Sine-square deformation (SSD) is a treatment proposed in quantum systems, which spatially modifies a Hamiltonian, gradually decreasing the local energy scale from the center of the system toward the edges by a sine-squared envelope function. It is known to serve as a good boundary condition as well as to provide physical quantities reproducing those of the infinite-size systems. We apply the SSD to one- and two-dimensional classical Ising models. Based on the analytical calculations and Monte Carlo simulations, we find that the classical SSD system is regarded as an extended canonical ensemble of a local subsystem each characterized by its own effective temperature. This effective temperature is defined by normalizing the system temperature by the deformed local energy scale. A single calculation for a fixed system temperature provides a set of physical quantities of various temperatures that quantitatively reproduce well those of the uniform system.
description: 15pages 8 figures
AC sensing using nitrogen vacancy centers in a diamond anvil cell up to 6 GPa
Creators: name: Wang, Z.
name: McPherson, C.
name: Kadado, R.
name: Brandt, N.
name: Edwards, S.
name: Casey, W. H.
name: Curro, N. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nitrogen-vacancy color centers in diamond have attracted broad attention as quantum sensors for both static and dynamic magnetic, electrical, strain and thermal fields, and are particularly attractive for quantum sensing under pressure in diamond anvil cells. Optically-based nuclear magnetic resonance may be possible at pressures greater than a few GPa, and offers an attractive alternative to conventional Faraday-induction based detection. Here we present AC sensing results and demonstrate synchronized readout up to 6 GPa, but find that the sensitivity is reduced due to inhomogeneities of the microwave field and pressure within the sample space. These experiments enable the possibility for all-optical high resolution magnetic resonance of nanoliter sample volumes at high pressures.
description: 12 pages, 11 figures. To appear in Phys. Rev. Appl
Semi-Lagrangian schemes for linear and fully non-linear diffusion equations
Creators: name: Debrabant, Kristian
name: Jakobsen, Espen R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 65M12, 65M15, 65M06, 35K10, 35K55, 35K65, 49L25, 49L20

description: For linear and fully non-linear diffusion equations of Bellman-Isaacs type, we introduce a class of approximation schemes based on differencing and interpolation. As opposed to classical numerical methods, these schemes work for general diffusions with coefficient matrices that may be non-diagonal dominant and arbitrarily degenerate. In general such schemes have to have a wide stencil. Besides providing a unifying framework for several known first order accurate schemes, our class of schemes includes new first and higher order versions. The methods are easy to implement and more efficient than some other known schemes. We prove consistency and stability of the methods, and for the monotone first order methods, we prove convergence in the general case and robust error estimates in the convex case. The methods are extensively tested.
description: Corrected some mistakes in previous version
Additional file 5 of Relationship between serum homocysteine, fibrinogen, lipoprotein-a level, and peripheral arterial disease: a dose–response meta-analysis
Creators: name: Wang, Hecheng
name: Wu, Pengpeng
name: Jiang, Deying
name: Zhang, Hao
name: Zhang, Jian
name: Zong, Yu
name: Han, Yanshuo
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Science Policy
subject: Hematology
subject: Computational Biology

description: Additional file 5: Table S4. Table of relative risks (95% confidence intervals) from the linear dose–response analysis of Hcy, FIB, LPa and risk of PAD.
Quadrotor going through a window and landing: An image-based visual servo control approach
Creators: name: Tang, Zhiqi
name: Cunha, Rita
name: Cabecinhas, David
name: Hamel, Tarek
name: Silvestre, Carlos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper considers the problem of controlling a quadrotor to go through a window and land on a planar target, the landing pad, using an Image-Based Visual Servo (IBVS) controller that relies on sensing information from two on-board cameras and an IMU. The maneuver is divided into two stages: crossing the window and landing on the pad. For the first stage, a control law is proposed that guarantees that the vehicle will not collide with the wall containing the window and will go through the window with non-zero velocity along the direction orthogonal to the window, keeping at all times a safety distance with respect to the window edges. For the landing stage, the proposed control law ensures that the vehicle achieves a smooth touchdown, keeping at all time a positive height above the plane containing the landing pad. For control purposes, the centroid vectors provided by the combination of the spherical image measurements of a collection of landmarks (corners) for both the window and the landing pad are used as position measurement. The translational optical flow relative to the wall, window edges, and landing plane is used as velocity cue. To achieve the proposed objective, no direct measurements nor explicit estimate of position or velocity are required. Simulation and experimental results are provided to illustrate the performance of the presented controller.
Distinguishing between light curves of ellipsoidal variables with massive dark companions, contact binaries, and semidetached binaries using principal component analysis
Creators: name: Pešta, Milan
name: Pejcha, Ondřej
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Photometric methods for identifying dark companion binaries - binary systems hosting quiescent black holes and neutron stars - operate by detecting ellipsoidal variations caused by tidal interactions. The limitation of this approach is that contact and semidetached binaries can produce similarly looking light curves. In this work, we address the degeneracy of ellipsoidal light curves by studying the differences between synthetically generated light curves of dark companion, semidetached, and contact binary systems. We inject the light curves with various levels of uncorrelated and correlated Gaussian noise to simulate the effects of instrumental noise and stellar spots. Using principal component analysis (PCA) and Fourier decomposition, we construct low-dimensional representations of the light curves. We find that the first two to five PCA components are sufficient to explain $99\%$ of variance in the data. The PCA representations are generally more informative than the Fourier representation for the same number of coefficients as measured by both the silhouette scores of the representations and the macro recalls of random forest classifiers trained on the representations. The random forest classifiers reach macro recalls from $0.97$ to $0.70$, indicating that the classes remain largely separable even under adverse conditions. We find that instrumental noise significantly impacts the class separation only when its standard deviation exceeds $10^{-3}$ mag, whereas the presence of spots can markedly reduce the class separation even when they contribute as little as $1\%$ of the light curve amplitude. We discuss the application of our method to real ellipsoidal samples, and we show that we can increase the purity of a sample of dark companion candidates by a factor of up to $27$ if we assume a prior purity of $1\%$, significantly improving the cost-efficiency of follow-up observations.
description: Submitted to A&A. 25 pages, 13 figures, 3 tables
Voci dell'ignoto: il lessico musicale del fantastico nell'Ottocento fra insetti musicanti e autoparodie
Creators: name: Fava, Elisabetta
Publisher: name: Università degli Studi di Cagliari
Year: 2014

description: Teatro, musica e letteratura del fantastico sono fortemente connessi fra di loro: non solo per le continue allusioni musicali della narrativa, ma anche per le sollecitazioni di natura letteraria che incoraggiano il delinearsi di un lessico musicale del fantastico. Partendo dal caso dell'Ottetto di Mendelssohn, il cui Scherzo si ispira a un passo del Walpurgisnachtstraum di Goethe, l'intervento mostra l'incidenza di alcuni topoi musicali del fantastico e la possibilità di utilizzarli anche in chiave parodistica, come avviene nel caso della Erste Walpurgisnacht (Goethe-Mendelssohn). La presenza degli insetti musicanti nel passo goethiano lascia a sua volta un'eredità costante in tutta la storia successiva del fantastico: come esempi si citano i quadri conclusivi delle Lustigen Weiber von Windsor di Otto Nicolai (1849) e del Falstaff di Giuseppe Verdi (1893), senza dimenticare situazioni analoghi riscontrabili nella musica russa da Čajkovskij a Skrjabin.  The Scherzo in Mendelssohn's Oktett (1825) is related to a part of Goethe's Faust I, the Walpurgisnachtstraum, where an orchestra of insects is playing during the witches Sabbath in fantastic ambience. The musical language uses several connotations (pianissimo, staccato, undefinited melody, quick tempo etc.) which definite the fantastic in sound realm; these connotations are very often associated to parodistic meanings, like in Die erste Walpurgisnacht (Goethe-Mendelssohn). In this respect, the insects too become usual characters in fantastic compositions; the essay tries to underline several common lines between literature and music, painting and music, fantastic and parody and explains how these elements appear in Verdi's Falstaffs and Nicolai's Lustigen Weiber insects, and how they survive in the instrumental music.
description: Between, Vol 4, N° 7 (2014): Poteri della retorica
Master Thesis - Theory and simulation on nonlinear spin-wave dynamics in magnetic vortices
Creators: name: Körber, Lukas
Publisher: name: Zenodo
Year: 2019
Subjects: spin wave
nonlinear
vortex
magnetism
micromagnetic simulation
magnon

description: This is my master thesis, as submitted to my university.

 One of the fascinating qualities of spin waves (or magnons), which are the elementary excitations in magnetically ordered substances, is their nonlinear behavior at moderate excitation powers. This makes spin waves not only an attractive model system to study general nonlinear systems, but it also provides a way to utilize nonlinear dynamics in possible technical applications. In a ferromagnetic nano disk which is magnetized in the vortex state, the spin-wave modes meet strict boundary conditions and therefore inherit a discrete spectrum. When driven with a large enough excitation field, they can decay into other spin-wave modes within well-defined channels due to a nonlinear process called three-magnon scattering. The aim of this thesis is to explore this phenomenon within nonlinear spin-wave theory and by means of micromagnetic simulations. For this purpose, first the linear dynamics are mapped out and the possible scattering channels are predicted. The stability of these channels with respect to static external fields is studied. Within this context, exotic spin-wave modes which arise in a broken cylindrical symmetry are found. Moreover, a model to predict the temporal evolution of the spin-wave modes is developed within the classical Hamiltonian formalism for nonlinear spin-wave dynamics. Together with micromagnetic simulations, this model is then applied in order to study the power-dependence of three-magnon scattering as well as to uncover a phenomenon called stimulated three-magnon scattering, which may allow for an integration of this nonlinear process in magnonic circuits. The results are compared with Brillouin light-scattering experiments which were conducted prior to this thesis or were motivated by it.
Untersuchungen zum Einfluss von Komorbiditäten und Langzeitveränderungen im experimentellen Schlaganfall-Modell
Creators: name: Prinz, Vincent
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2021
Subjects: subject: stroke
subject: MRI
subject: cranial window
subject: middle cerebral artery occlusion
subject: post stroke depression
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Der Schlaganfall ist epidemiologisch und sozioökonomisch ein hochrelevantes Krankheitsbild. In der vorliegenden Arbeit stellen wir ein gut charakterisiertes und zuverlässiges Modell zur Verfügung, um den Einfluss von chronischem Stress bei Schlaganfall zu untersuchen. Unsere Ergebnisse zeigen, dass chronische Stressexposition über die Aktivierung der Hypothalamus-Hypophysen-Nebennieren-Achse zu einer stressinduzierten endothelialen Dysfunktion führt, was bei Schlaganfall eine erhöhte Vulnerabilität zur Folge hat. Weiterhin charakterisieren wir multimodal ein neues Mausmodell für die Post-Schlaganfall Depression, das die mögliche pathophysiologische Bedeutung von sekundären Veränderungen des mesolimbischen dopaminergen Systems hervorhebt. Das Ansprechen der EPND auf medikamentöse Interventionen könnte ein vielversprechendes Ziel für die Entwicklung neuer therapeutischer Ansätze für eine subakute Schlaganfallbehandlung darstellen. Darüber hinaus wurde ein experimentelles Schlaganfallmodell entwickelt, das ein etabliertes kortikales Schlaganfall-Modell um ein chronisches Schädelfenster erweitert und so die longitudinale Intravitalmikroskopie als auch die lokale Applikation von Medikamenten ermöglicht. Die Ergebnisse zeigen eine hohe Reproduzierbarkeit der Schlaganfallvolumina und niedrige Komplikationsraten, was insbesondere im Hinblick auf die Untersuchung von Langzeitverläufen sowie regenerativen Prozessen hoch relevant ist. Die Gefäßdichte, Dynamik des Blutflusses als auch die dynamische Rekrutierung zirkulierender Zellen sowie Zell-zu-Zell-Interaktionen können mit Hilfe eines Multi-Fluoreszenz-Epifluoreszenz- Mikroskopiesystems bzw. eines konfokalen Dual-Photonen-Laser-Scanning-Mikroskops untersucht werden. In Vorbereitung auf eine klinische Studie, konnten wir das chronische Schädelfenster zur Langzeitbeobachtung auch nutzen, um die lokale Anwendung einer neuartigen Applikationsform (NicaPlant®) des Calziumantagonisten Nicardipin zu untersuchen. Die topische Applikation von NicaPlant® im Mausmodell führte zu keinen unerwünschten Nebenwirkungen und bietet in-vitro eine nahezu lineare Freisetzung von Nicardipin über einen Zeitraum von 21 Tagen, was auf den pathophysiologischen Zeitverlauf der aSAB abgestimmt ist.
Prediction Analysis of Optical Tracker Parameters using Machine Learning Approaches for efficient Head Tracking
Creators: name: Kataria, Aman
name: Ghosh, Smarajit
name: Karar, Vinod
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: A head tracker is a crucial part of the head mounted display systems, as it tracks the head of the pilot in the plane/cockpit simulator. The operational flaws of head trackers are also dependent on different environmental conditions like different lighting conditions and stray light interference. In this letter, an optical tracker has been employed to gather the 6-DoF data of head movements under different environmental conditions. Also, the effect of different environmental conditions and variation in distance between the receiver and optical transmitter on the 6-DoF data was analyzed.
description: 7 Pages, 9 Figures, 7 tables
Scale Statistics of Current Sheets in Relativistic Collisionless Plasma Turbulence
Creators: name: Serrano, Roberto F.
name: Nättilä, Joonas
name: Zhdankin, Vladimir
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We analyze distributions of the spatial scales of coherent intermittent structures -- current sheets -- obtained from fully kinetic, two-dimensional simulations of relativistic plasma turbulence using unsupervised machine-learning data dissection. We find that the distribution functions of sheet length $\ell$ (longest scale of the analyzed structure in the direction perpendicular to the dominant guide field) and curvature $r_c$ (radius of a circle fitted to the structures) can be well-approximated by power-law distributions, indicating self-similarity of the structures. The distribution for the sheet width $w$ (shortest scale of the structure) peaks at the kinetic scales and decays exponentially at larger values. The data shows little or no correlation between $w$ and $\ell$, as expected from theoretical considerations. The typical $r_c$ depends linearly on $\ell$, which indicates that the sheets all have a similar curvature relative to their sizes. We find a weak correlation between $r_c$ and $w$. Our results can be used to inform realistic magnetohydrodynamic sub-grid models for plasma turbulence in high-energy astrophysics.
description: 19 pages, 10 figures
Carbon Nanotube Electron Windmills: A Novel Design for Nanomotors
Creators: name: Bailey, S W D
name: Amanatidis, I
name: Lambert, C J
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose a new drive mechanism for carbon nanotube (CNT) motors, based upon the torque generated by a flux of electrons passing through a chiral nanotube. The structure of interest comprises a double-walled CNT, formed from, for example, an achiral outer tube encompassing a chiral inner tube. Through a detailed analysis of electrons passing through such a "windmill", we find that the current due to a potential difference applied to the outer CNT generates sufficient torque to overcome the static and dynamic frictional forces that exists between the inner and outer walls, thereby causing the inner tube to rotate.
description: 10 pages and 4 figures
title: Εφαρμογές στην βαθιά μηχανική μάθηση
title: Application in machine deep learning
titleType: AlternativeTitle
Creators: name: Καλαμπόκας, Νικόλαος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Βαθιά μάθηση
Μηχανική μάθηση
Αναγνώριση αντικειμένων
Μοντέλα αναγνώρισης αντικειμένων
SSD
YOLO
Mask-RCNN

description: Η Μηχανική Μάθηση είναι υποπεδίο της επιστήμης των υπολογιστών, που αναπτύχθηκε από τη μελέτη της αναγνώρισης προτύπων και της υπολογιστικής θεωρίας μάθησης στην τεχνητή νοημοσύνη. Το 1959, ο Άρθουρ Σάμουελ ορίζει την μηχανική μάθηση ως Πεδίο μελέτης που δίνει στους υπολογιστές την ικανότητα να μαθαίνουν, χωρίς να έχουν ρητά προγραμματιστεί. Η μηχανική μάθηση διερευνά τη μελέτη αλγορίθμων που μπορούν να μαθαίνουν από τα δεδομένα και να κάνουν προβλέψεις σχετικά με αυτά. Τέτοιοι αλγόριθμοι λειτουργούν κατασκευάζοντας μοντέλα από πειραματικά δεδομένα, προκειμένου να κάνουν προβλέψεις βασιζόμενες στα δεδομένα ή να εξάγουν αποφάσεις που εκφράζονται ως το αποτέλεσμα. Η παρούσα διπλωματική εργασία με τίτλο «Εφαρμογές στην Μηχανική Μάθηση» αναφέρεται στη συγκριτική αξιολόγηση της επίδοσης μοντέλων αναγνώρισης αντικειμένων και συγκεκριμένα της επιβλεπόμενης μάθησης για την αναγνώριση οχημάτων, ανθρώπων και σημάτων κατά τη διάρκεια της οδήγησης. Τα μοντέλα που χρησιμοποιήθηκαν είναι τα SSD( SingleShotDetection),YOLO( YouOnlyLookOnce)και Mask-RCNN. Γίνεται παρουσίαση των μοντέλων που επιλέχθηκαν και των αποτελεσμάτων εφαρμογής των αλγορίθμων σε ένα σύνολο δεδομένων. Η επεξεργασία πραγματοποιήθηκε με τη χρήση της γλώσσας προγραμματισμού Python.
Note on $\mathcal{N}=8$ supersymmetric mechanics with dynamical and semi-dynamical multiplets
Creators: name: Khastyan, Erik
name: Krivonos, Sergey
name: Nersessian, Armen
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give a Hamiltonian formulation of the new model of $\mathcal{N}=8$ supersymmetric mechanics recently proposed by S.~Fedoruk and E.~Ivanov and show that it possesses the dynamical $\mathcal{N}=8$ superconformal symmetry $osp(8|2)$. The bosonic part of the Hamiltonian is just a free particle on eight-dimensional cone embedded in nine-dimensional pseudo-Euclidean space, while the fermionic part can be interpreted as a spin-orbit interaction term.
description: 8 pages, revised version
Ground state energy of the polarized diluted gas of interacting spin $1/2$ fermions
Creators: name: Chankowski, Piotr
name: Wojtkiewicz, Jacek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The effective field theory approach simplifies the perturbative computation of the ground state energy of the diluted gas of fermions allowing in the case of the unpolarized system to easily re-derive the classic results up to the $(k_{\rm F}a_0)^2$ order (where $k_{\rm F}$ is the system's Fermi momentum and $a_0$ the $s$-wave scattering length) and (with more labour) to extend it up to the order $(k_{\rm F}a_0)^4$. The corresponding expansion of the ground state energy of the polarized gas of spin $1/2$ fermions is known analytically (to our best knowledge) only up to the $k_{\rm F}a_0$ (where $k_{\rm F}$ stands for $k_{{\rm F}\uparrow}$ or $k_{{\rm F}\downarrow}$) order. Here we show that the same effective field theory method allows to easily compute also the order $(k_{\rm F}a_0)^2$ correction to this result.
description: 24 pages; in the present version, some new remarks are added
Additional file 2 of Effects of cognitive ageing trajectories on multiple adverse outcomes among Chinese community-dwelling elderly population
Creators: name: Han, Chao
name: An, Jing
name: Chan, Piu
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Mental Health
subject: Computational Biology

description: Additional file 2.
title: ¨Το δέρμα που κατοικώ¨: Μια απόπειρα επανάχρησης του πρώην εργοστασίου Ήβη σε χώρο πολιτισμού.
title: ¨The skin I live in¨: An attempt to reuse the former factory Ivi in a cultural center.
titleType: AlternativeTitle
Creators: name: Μιχαήλ, Ειρήνη
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Pedro Almodovar
Σώμα
Το δέρμα που κατοικώ
Χώρος πολιτισμού
Πειραιώς

description: Η παρούσα πτυχιακή εργασία πραγματεύεται τον επανασχεδιασμό του πρώην εργοστασίου πνευματοποιίας ¨Ήβη¨, το οποίο βρίσκεται στην οδό Πειριαιώς και τη μετατροπή του σε χωρο πολιτισμού. Κεντρική ιδέα τόσο για το σχεδιασμό, όσο και για τη θεματική οργάνωση του χώρου αποτέλεσε η έννοια του σώματος, όπως παρουσιάζεται στην ταινία του Pedro Almodovar, ¨To δέρμα που κατοικώ¨.
Heavy Quark Diffusion with Relativistic Langevin Dynamics in the Quark-Gluon Fluid
Creators: name: Akamatsu, Yukinao
name: Hatsuda, Tetsuo
name: Hirano, Tetsufumi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The relativistic diffusion process of heavy quarks is formulated on the basis of the relativistic Langevin equation in Itô discretization scheme. The drag force inside the quark-gluon plasma (QGP) is parametrized according to the formula for the strongly coupled plasma obtained by the AdS/CFT correspondence. The diffusion dynamics of charm and bottom quarks in QGP is described by combining the Langevin simulation under the background matter described by the relativistic hydrodynamics. Theoretical calculations of the nuclear modification factor R_{AA} and the elliptic flow v_{2} for the single electrons from the charm and bottom decays are compared with the experimental data from the relativistic heavy ion collisions. The R_{AA} for electrons with large transverse momentum (p_{T} > 3 GeV) indicates that the drag force from the QGP is as strong as the AdS/CFT prediction.
description: 13 pages, 10 figures
Entanglement of Disjoint Intervals in Dual-Unitary Circuits: Exact Results
Creators: name: Foligno, Alessandro
name: Bertini, Bruno
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The growth of the entanglement between two disjoint intervals and its complement after a quantum quench is regarded as a dynamical chaos indicator. Namely, it is expected to show qualitatively different behaviours depending on whether the underlying microscopic dynamics is chaotic or integrable. So far, however, this could only be verified in the context of conformal field theories. Here we present an exact confirmation of this expectation in a class of interacting microscopic Floquet systems on the lattice, i.e., dual-unitary circuits. These systems can either have zero or a super extensive number of conserved charges: the latter case is achieved via fine-tuning. We show that, for almost all dual unitary circuits on qubits and for a large family of dual-unitary circuits on qudits the asymptotic entanglement dynamics agrees with what is expected for chaotic systems. On the other hand, if we require the systems to have conserved charges, we find that the entanglement displays the qualitatively different behaviour expected for integrable systems. Interestingly, despite having many conserved charges, charge-conserving dual-unitary circuits are in general not Yang-Baxter integrable.
description: 6+5 pages, 4 figures; v2 11 pages, 4 figures presentation improved; v3 version accepted by Quantum
การใช้ม่านบังผนังกระจกและปล่องระบายอากาศเพื่อลดอุณหภูมิภายในห้องไม่ปรับอากาศ
Creators: name: ประภัสสร แซมมงคล
Publisher: name: Thammasat University
Year: 2021
Subjects: การระบายอากาศ
ปล่องรังสีอาทิตย์
ความต้านทานความร้อน
ม่านสะท้อนความร้อน

description: Journal of Architectural/Planning Research and Studies, 18, 1, 53-64
Effect of correlated disorder on the temperature of unconventional Cooper pairing (3He in aerogel)
Creators: name: Fomin, I. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Using liquid 3He in aerogel as an example, it is shown that correlations in positions of impurities affect the temperature $T_c$ of transition of Fermi liquid in an unconventional superfluid or superconductive state. The effect is significant if the correlation length for impurities is greater than the coherence length in the superfluid or superconductive state $ξ_0$. For 3He in aerogel the suppression of $T_c$ is expressed in terms of the structure factor of aerogel. With the account of the fractal structure of aerogel a simple expression is obtained for the decrease of $T_c$ from its clean value. This expression is in a satisfactory agreement with experimental data.
description: 9 pages, 1 figure, Russian version accepted for publication in "Pis`ma v ZhETF"
Searching for molecular hydrogen mid-infrared emission in the circumstellar environments of Herbig Be stars
Creators: name: Martin-Zaidi, C.
name: van Dishoeck, E. F.
name: Augereau, J. -C.
name: Lagage, P. -O.
name: Pantin, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: Molecular hydrogen (H2) is the most abundant molecule in the circumstellar (CS) environments of young stars, and is a key element in giant planet formation. The measurement of the H2 content provides the most direct probe of the total amount of CS gas, especially in the inner warm planet-forming regions of the disks. Aims: Most Herbig Be stars (HBes) are distant from the Sun and their nature and evolution are still debated. We therefore conducted mid-infrared observations of H2 as a tracer of warm gas around HBes known to have gas-rich CS environments. Methods: We report a search for the H2 S(1) emission line at 17.0348 microns in the CS environments of 5 HBes with the high resolution spectroscopic mode of VISIR (ESO VLT Imager and Spectrometer for the mid-InfraRed). Results: No source shows evidence for H2 emission at 17.0348 microns. Stringent 3sigma upper limits on the integrated line fluxes are derived. Depending on the adopted temperature, limits on column densities and masses of warm gas are also estimated. These non-detections constrain the amount of warm (>150 K) gas in the immediate CS environments of our target stars to be less than 1-10 Jupiter masses.
description: Research Note accepted for publication in A&A, 5 pages, 1 figure, 2 tables
title: Οι Επιδράσεις των Πανδημιών στην Αρχιτεκτονική: Το Παράδειγμα του COVID19
title: The Impacts of Pandemics on Architecture: The Example of COVID19
titleType: AlternativeTitle
Creators: name: Τζίκα, Φανή
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Πανδημία
COVID19
Αρχιτεκτονική
CIAM
Νέες φόρμουλες δόμησης

description: Στα τέλη του 2019 έκανε την εμφάνιση του ένα νέο είδος κορονοϊού, ονόματι COVID-19 στην πόλη Γιουχάν (ή Ουχάν), της κεντρικής ενδοχώρας της Κίνας. Οι αρχιτέκτονες έχουν στραφεί σε νέες φόρμουλες δόμησης όπου η χωρική διάταξη και η αναδιαμόρφωση είναι το βασικό χαρακτηριστικό. H Αρχιτεκτονική των χώρων θα διαμορφωθεί με χαρακτήρα κυρίως αμυντικό. Παρόλο που η τρέχουσα πανδημία αποτελεί πρόκληση σε όλα τα επίπεδα στο δομημένο περιβάλλον, θα χρειαστεί χρόνος για να αναπτυχθεί ένα κατάλληλο πρότυπο αστικής δόμησης. Ως εκ τούτου, ο άνθρωπος εγκλείεται σε ένα περιβάλλον όπως η κατοικία του μεγάλο μέρος της ημέρας εξασκώντας τις καθημερινές του δραστηριότητες μέσα από ένα χώρο (τηλεργασία, τηλεκπαίδευση, ηλεκτρονικό εμπόριο). Η έξαρση της πανδημίας του COVID-19 , όπως και προηγούμενες πανδημίες άλλωστε, θα μεταμορφώσει την αρχιτεκτονική των χώρων με χαρακτήρα κυρίως αμυντικό, λαμβάνοντας τα κατάλληλα μέτρα και εφόδια για την προάσπιση της δημόσιας υγείας, διασφαλίζοντας έτσι την άμεση αντιμετώπιση επερχόμενων πανδημιών. Οι κατοικίες, τα καταστήματα, οι χώροι εργασίας θα πρέπει να αναδιαμορφωθούν ριζικά ώστε να επιτρέπεται απόσταση μεταξύ των ανθρώπων και η αποφυγή συνωστισμού με σκοπό τη μείωση διασποράς του ιού. Σκοπός της παρούσας εργασίας είναι η βιβλιογραφική ανασκόπηση για τη σχέση μεταξύ των επιπτώσεων των πανδημιών με αφορμή την διασπορά της τρέχουσας πανδημίας, COVID-19 , και τον αρχιτεκτονικό σχεδιασμό κατοικιών, χώρων εργασίας, καταστημάτων και γενικά του σχεδιασμού.
title: Identity and development : Kazakhstan’s transformation from recipient to donor of development assistance
Creators: name: Fjaestad, Kristin
Publisher: name: University of St Andrews
Year: 2020

description: In recent years, re-emerging development actors are said to be changing, and even challenging, the international aid landscape. This thesis examines how Kazakhstan, an authoritarian, post-Soviet state, has formulated its policy of official development assistance (ODA) and performed its identity as a donor. The thesis argues that Kazakhstan’s donor identity and ODA policy are constructed through discursive encounters of development between Kazakhstani state actors and representatives of the international development community. To advance this argument, it examines Kazakhstan’s transformation from recipient to donor during the period 1991–2017. The thesis both applies and extends Hansen’s post-structuralist framework of the mutual constitution of state identity and policy to Central Asia and the policy area of ODA. In doing so, it contributes to the literature in two ways: empirically, it adds an in-depth case study of an authoritarian post-Soviet state to the growing literature on emerging donors and the ongoing changes in the development aid landscape. It also extends the scholarly debate about the relationship between identity and policy as well as the role of international actors in policymaking in Kazakhstan. The thesis answers two main research questions: How has Kazakhstan, an authoritarian, post-Soviet state, been constructed as a donor of development aid? In this process, how is development represented, negotiated and contested by the actors involved? The research questions are answered by applying discourse analysis to official documents and media articles from both Kazakhstani and international sources, as well as 30 interviews carried out during fieldwork in 2014 and 2016. Three key encounters with the international development community are found to be shaping Kazakhstan’s transformation: First as an aid recipient, then as an aspiring donor seeking membership of the Development Assistance Committee (DAC) of the Organisation for Economic Co-operation and Development, and finally as a donor partnering with the United Nations Development Programme (UNDP) to provide and institutionalise ODA. The thesis concludes that Kazakhstan’s ODA policy, in contrast to those of other emerging donors, largely concerns the country’s linkage to and recognition by established development actors, the DAC and the UNDP, as its main Others instead of the recipient countries, the Kazakhstani public or civil society. Through its close linkage to the DAC and the UNDP, Kazakhstan’s donor identity and ODA policy have reaffirmed the authority of these established actors.
Additional file 3 of Relationship between serum homocysteine, fibrinogen, lipoprotein-a level, and peripheral arterial disease: a dose–response meta-analysis
Creators: name: Wang, Hecheng
name: Wu, Pengpeng
name: Jiang, Deying
name: Zhang, Hao
name: Zhang, Jian
name: Zong, Yu
name: Han, Yanshuo
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Science Policy
subject: Hematology
subject: Computational Biology

description: Additional file 3: Figure S1. Weighted mean difference (WMDs) and 95% confidence intervals (CIs) of the selected studies and the pooled Hcy levels (A), FIB level (B) and LPa level C in patients with PAD and control subjects.
Status report of the Tokyo axion helioscope experiment
Creators: name: Inoue, Y.
name: Minowa, M.
name: Akimoto, Y.
name: Ota, R.
name: Mizumoto, T.
name: Yamamoto, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have searched for solar axions with a detector which consists of a 4T x 2.3m superconducting magnet, PIN-photodiode X-ray detectors, and an altazimuth mount to track the sun. The conversion region is filled with cold helium gas which modifies the axion mass at which coherent conversion occurs. In the past measurements, axion mass from 0 to 0.27eV have been scanned. Since no positive evidence was seen, an upper limit to the axion-photon coupling constant was set to be g < 6-10E-10/GeV (95%CL) depending on the axion masses. We are now actively preparing for a new stage of the experiment aiming at one to a few eV solar axions. In this mass region, our detector might be able to check parameter regions which are preferable to the axion models.
description: 3 pages, 3 figures, submitted to be included in the proceedings of TAUP 2007
Universal and non-universal large deviations in critical systems
Creators: name: Balog, Ivan
name: Delamotte, Bertrand
name: Rançon, Adam
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Rare events play a crucial role in understanding complex systems. Characterizing and analyzing them in scale-invariant situations is challenging due to strong correlations. In this work, we focus on characterizing the tails of probability distribution functions (PDFs) for these systems. Using a variety of methods, perturbation theory, functional renormalization group, hierarchical models, large $n$ limit, and Monte Carlo simulations, we investigate universal rare events of critical $O(n)$ systems. Additionally, we explore the crossover from universal to nonuniversal behavior in PDF tails, extending Cramér's series to strongly correlated variables. Our findings highlight the universal and nonuniversal aspects of rare event statistics and challenge existing assumptions about power-law corrections to the leading stretched exponential decay in these tails.
description: v1) 17 pages, 8 figures; v2) minor corrections, published version
Quantum Semi-Markov Processes
Creators: name: Breuer, Heinz-Peter
name: Vacchini, Bassano
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We construct a large class of non-Markovian master equations that describe the dynamics of open quantum systems featuring strong memory effects, which relies on a quantum generalization of the concept of classical semi-Markov processes. General conditions for the complete positivity of the corresponding quantum dynamical maps are formulated. The resulting non-Markovian quantum processes allow the treatment of a variety of physical systems, as is illustrated by means of various examples and applications, including quantum optical systems and models of quantum transport.
description: 4 pages, revtex, no figures, to appear in Phys. Rev. Lett