cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Jets in FR0 radio galaxies
Creators: name: Giovannini, G.
name: Baldi, R. D.
name: Capetti, A.
name: Giroletti, M.
name: Lico, R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The local radio-loud AGN population is dominated by compact sources named FR0s. These sources show features, for example the host type, the mass of the supermassive black hole (SMBH), and the multi-band nuclear characteristics, that are similar to those of FRI radio galaxies. However, in the radio band, while FR0 and FRI share the same nuclear properties, the kiloparsec-scale diffuse component dominant in FRI is missing in FR0s. With this project we would like to study the parsec-scale structure in FR0s in comparison with that of FRI sources. To this end we observed 18 FR0 galaxies with the VLBA at 1.5 and 5 GHz and/or with the EVN at 1.7 GHz and produced detailed images at milliarcsec resolution of their nuclear emission to study the jet and core structure. All sources have been detected but one. Four sources are unresolved, even in these high-resolution images; jets have been detected in all other sources. We derived the distribution of the jet-to-counter-jet ratio of FR0s and found that it is significantly different from that of FRIs, suggesting different jet bulk speed velocities. Combining the present data with published data of FR0 with VLBI observations, we derive that the radio structure of FR0 galaxies shows strong evidence that parsec-scale jets in FR0 sources are mildly relativistic with a bulk velocity on the order of 0.5c or less. A jet structure with a thin inner relativistic spine surrounded by a low-velocity sheath could be in agreement with the SMBH and jet launch region properties.
description: 12 pages, 16 figures Accepted for the publication in Astronomy and Astrophysics
Observation of a new light-induced skyrmion phase in the Mott insulator Cu2OSeO3
Creators: name: Sapozhnik, Alexey A.
name: Truc, Benoit
name: Tengdin, Phoebe
name: Boström, Emil Viñas
name: Schönenberger, Thomas
name: Gargiulo, Simone
name: Madan, Ivan
name: LaGrange, Thomas
name: Magrez, Arnaud
name: Verdozzi, Claudio
name: Rubio, Angel
name: Rønnow, Henrik M.
name: Carbone, Fabrizio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the discovery of a novel skyrmion phase in the multiferroic insulator Cu2OSeO3 for magnetic fields below the equilibrium skyrmion pocket. This phase can be accessed by exciting the sample out of equilibrium with near-infrared (NIR) femtosecond laser pulses but can not be reached by any conventional field cooling protocol. From the strong wavelength dependence of the photocreation process and via spin dynamics simulations, we identify the magnetoelastic effect as the most likely photocreation mechanism. This effect results in a transient modification of the magnetic interaction extending the equilibrium skyrmion pocket to lower magnetic fields. Once created, the skyrmions rearrange and remain stable over a long time, reaching minutes. The presented results are relevant for designing high-efficiency non-volatile data storage based on magnetic skyrmions.
description: 11 pages, 5 figures
title: Ανάπτυξη αλγορίθμων για εξαγωγή γονιδιακών υπογραφών στην οστεοαρθρίτιδα
Creators: name: Μπακάλη Κωνσταντίνα
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
AC loss calculation in coated conductor coils with a large number of turns
Creators: name: Pardo, Enric
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: For superconducting coils with many turns, it is widely believed that the magnetic field from magnetization currents is negligible compared to the one generated by the whole coil. This article shows that this is not true for coils with a considerably large number of turns (up to thousands). We introduce a method to accurately calculate the AC loss in coils with virtually any number of turns that takes the magnetization currents into account. The current density and AC loss is analyzed for two windings made of coated conductor consisting of 32 pancake coils totaling 768 and 6400 turns, respectively.
description: 12 pages, 6 figures; Accepted Manuscript after peer review; copyright held by Institute of Physics (IoP)
General classification of charged test particle circular orbits in Reissner--Nordström spacetime
Creators: name: Pugliese, D.
name: Quevedo, H.
name: Ruffini, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate charged particles circular motion in the gravitational field of a charged mass distribution described by the Reissner-Nordström spacetime. We introduce a set of independent parameters completely characterizing the different spatial regions in which circular motion is allowed. We provide most complete classification of circular orbits for different sets of particle and source charge-to-mass ratios. We study both black holes and naked singularities and show that the behavior of charged particles depend drastically on the type of source. Our analysis shows in an alternative manner that the behavior of circular orbits can in principle be used to distinguish between black holes and naked singularities. From this analysis, special limiting values for the dimensionless charge of black hole and naked singularity emerge, namely, Q/M=1/2, $Q/M=\sqrt{13}/5$ and $Q/M=\sqrt{2/3}$ for the black hole case and Q/M=1, $Q/M=5/ (2 \sqrt{6})$, $Q/M=3 \sqrt{6}/7$, and finally $Q/M= \sqrt{9/8}$ for the naked singularity case. Similarly and surprisingly, analogue limits emerge for the orbiting particles charge-to-mass ratio $ε$, for positive charges $ε=1$, $ε=2$ and $ε=M/Q$. These limits play an important role in the study of the coupled electromagnetic and gravitational interactions, and the investigation of the role of the charge in the gravitational collapse of compact objects.
description: 18pages, 29 figures, 10 tables. Follows Phys.Rev. D83 (2011) 104052. Updated version to match the published article
The Araucaria project: High-precision orbital parallaxes and masses of binary stars. I. VLTI/GRAVITY observations of ten double-lined spectroscopic binaries
Creators: name: Gallenne, A.
name: Mérand, A.
name: Kervella, P.
name: Graczyk, D.
name: Pietrzyński, G.
name: Gieren, W.
name: Pilecki, B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We aim to measure very precise and accurate model-independent masses and distances of detached binary stars. Precise masses at the $< 1$% level are necessary to test and calibrate stellar interior and evolution models, while precise and independent orbital parallaxes are essential to check for the next Gaia data releases. We combined RV measurements with interferometric observations to determine orbital and physical parameters of ten double-lined spectroscopic systems. We report new relative astrometry from VLTI/GRAVITY and, for some systems, new VLT/UVES spectra to determine the radial velocities of each component. We measured the distance of ten binary systems and the mass of their components with a precision as high as 0.03% (average level 0.2%). They are combined with other stellar parameters (effective temperatures, radii, flux ratios, etc.) to fit stellar isochrones and determine their evolution stage and age. We also compared our orbital parallaxes with Gaia and showed that half of the stars are beyond $1σ$ with our orbital parallaxes; although, their RUWE is below the frequently used cutoff of 1.4 for reliable Gaia astrometry. By fitting the telluric features in the GRAVITY spectra, we also estimated the accuracy of the wavelength calibration to be $\sim 0.02$% in high and medium spectral resolution modes. We demonstrate that combining spectroscopic and interferometric observations of binary stars provides extremely precise and accurate dynamical masses and orbital parallaxes. As they are detached binaries, they can be used as benchmark stars to calibrate stellar evolution models and test the Gaia parallaxes.
description: Accepted for publication in A&A
Wormhole solutions in $f(Q,T)$ gravity with a radial dependent B parameter
Creators: name: Tayde, Moreshwar
name: Santos, Joao R. L.
name: Araujo, Julia N.
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A possible astrophysical object to be found in General Relativity is the wormhole. This special solution describes a topological bridge connecting points in two distinguished universes or two different points in the same universe. Despite it was never observed so far, is desired to find traversable wormholes, i.e. wormholes which have a throat at which there is no horizon. However, the traversable wormhole constraints yield solutions that violate all the energy conditions in General Relativity. In the last few years, several models to describe gravity beyond $Λ$CDM have been proposed. Then, it is relevant to look for wormhole solutions for these new theories. In this study, we are going to unveil new wormhole solutions for the so-called $f(Q,T)$ gravity. This theory of gravity is based on the non-metricity scalar $Q$, which is responsible for the gravitational interaction together with the energy-momentum trace $T$. We use the embedding procedure to find both the energy and the equilibrium conditions for the existence of wormholes. Then, the nontrivial contributions coming from $f(Q,T)$ gravity are embedded into the effective equations for density and pressures. We also considered the presence of exotic strange matter in the wormhole throat. Such a matter obeys the notorious MIT bag Model. We are going to present new scenarios confirming the viability of traversable wormholes in $f(Q,T)$ gravity with the strange matter, satisfying SEC and WEC energy conditions.
description: Comments are welcome
Multiscale Theory
Creators: name: Grmela, Miroslav
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Boltzmann kinetic equation is put into the form of an abstract time evolution equation representing links connecting autonomous mesoscopic dynamical theories involving varying amount of details. In the chronological order we present results that led to the abstract time equation evolution in both state space and the space of vector fields. In the final section we list some open problems.
description: Accepted in Journal of Nonequilibrium Thermodynamics
วิทยาการวิเคราะห์ข้อมูลทางบัญชี ทักษะที่นักบัญชีควรมีพร้อมในอนาคต
Creators: name: เอกพล คงมา
Publisher: name: คณะพาณิชยศาสตร์และการบัญชี มหาวิทยาลัยธรรมศาสตร์
Year: 2021
Subjects: วิทยาการวิเคราะห์ข้อมูลทางบัญชี
การวิเคราะหข้อมูลเชิงลึกทางบัญชี
การวิเคราะห์ข้อมูลขนาดใหญ่ทางบัญชี

description: วารสารวิชาชีพบัญชี JAP, 17, 54 (มิถุนายน 64), 68
The Role of AI in Drug Discovery: Challenges, Opportunities, and Strategies
Creators: name: Blanco-Gonzalez, Alexandre
name: Cabezon, Alfonso
name: Seco-Gonzalez, Alejandro
name: Conde-Torres, Daniel
name: Antelo-Riveiro, Paula
name: Pineiro, Angel
name: Garcia-Fandino, Rebeca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Artificial intelligence (AI) has the potential to revolutionize the drug discovery process, offering improved efficiency, accuracy, and speed. However, the successful application of AI is dependent on the availability of high-quality data, the addressing of ethical concerns, and the recognition of the limitations of AI-based approaches. In this article, the benefits, challenges and drawbacks of AI in this field are reviewed, and possible strategies and approaches for overcoming the present obstacles are proposed. The use of data augmentation, explainable AI, and the integration of AI with traditional experimental methods, as well as the potential advantages of AI in pharmaceutical research are also discussed. Overall, this review highlights the potential of AI in drug discovery and provides insights into the challenges and opportunities for realizing its potential in this field. Note from the human-authors: This article was created to test the ability of ChatGPT, a chatbot based on the GPT-3.5 language model, to assist human authors in writing review articles. The text generated by the AI following our instructions (see Supporting Information) was used as a starting point, and its ability to automatically generate content was evaluated. After conducting a thorough review, human authors practically rewrote the manuscript, striving to maintain a balance between the original proposal and scientific criteria. The advantages and limitations of using AI for this purpose are discussed in the last section.
description: 11 pages, 1 figure
A theory for the emergence of coherent structures in beta-plane turbulence
Creators: name: Bakas, Nikolaos A.
name: Ioannou, Petros J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Planetary turbulent flows are observed to self-organize into large scale structures such as zonal jets and coherent vortices. One of the simplest models of planetary turbulence is obtained by considering a barotropic flow on a beta-plane channel with turbulence sustained by random stirring. Non-linear integrations of this model show that as the energy input rate of the forcing is increased, the homogeneity of the flow is broken with the emergence of non-zonal, coherent, westward propagating structures and at larger energy input rates by the emergence of zonal jets. We study the emergence of non-zonal coherent structures using a non-equilibrium statistical theory, Stochastic Structural Stability Theory (S3T, previously referred to as SSST). S3T directly models a second order approximation to the statistical mean turbulent state and allows identification of statistical turbulent equilibria and study of their stability. Using S3T, the bifurcation properties of the homogeneous state in barotropic beta-plane turbulence are determined. Analytic expressions for the zonal and non-zonal large scale coherent flows that emerge as a result of structural instability are obtained. Through numerical integrations of the S3T dynamical system, it is found that the unstable structures equilibrate at finite amplitude. Numerical simulations of the nonlinear equations confirm the characteristics (scale, amplitude and phase speed) of the structures predicted by S3T.
description: submitted to Journal of Fluid Mechanics
Stress and adolescent well-being: the need for an interdisciplinary framework
Creators: name: Sigfusdottir, Inga Dora
name: Kristjansson, Alfgeir L.
name: Thorlindsson, Thorolfur
name: Allegrante, John P.
Publisher: name: Columbia University
Year: 2017
Subjects: Stress (Psychology)
Teenagers
Stress in adolescence
Interdisciplinary research

description: Stress and strain among adolescents have been investigated and discussed largely within three separate disciplines: mental health, where the focus has been on the negative effects of stress on emotional health; criminology, where the emphasis has been on the effects of strain on delinquency; and biology, where the focus has been to understand the effects of stress on physiology. Recently, scholars have called for increased multilevel developmental analyses of the bio-psychosocial nature of risk and protection for behaviors of individuals. This paper draws on several different but converging theoretical perspectives in an attempt to provide an overview of research relevant to stress in adolescence and puts forth a new framework that aims to provide both a common language and consilience by which future research can analyze the effects of multiple biological, social and environmental factors experienced during specific developmental periods, and cumulatively over time, on harmful behavior during adolescence. We present a framework to examine the effects of stress on diverse behavioral outcomes among adolescents, including substance use, suicidal behavior, self-inflicted harm, and delinquency.
Building a Better Teacher: How Teaching Works (and How to Teach It to Everyone)
Creators: name: สมชาย ศุภธาดา
Publisher: name: คณะพาณิชยศาสตร์และการบัญชี มหาวิทยาลัยธรรมศาสตร์
Year: 2021
Subjects: n/a

description: วารสารวิชาชีพบัญชี JAP, 17, 54 (มิถุนายน 64), 84
Energy Partition of Thermal and Nonthermal Particles in Magnetic Reconnection
Creators: name: Hoshino, Masahiro
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Magnetic reconnection has long been known to be the most important mechanism as quick conversion of magnetic field energy into plasma kinetic energy. In addition, energy dissipation by reconnection has gained attention not only as a plasma heating mechanism, but also as a plasma mechanism for accelerating nonthermal particles. However, the energy partitioning of thermal and nonthermal plasmas during magnetic reconnection is not understood. Here, we studied energy partition as a function of plasma sheet temperature and guide magnetic field. In relativistic reconnection with anti-parallel magnetic field or weak guide magnetic field, it was found that the nonthermal energy density can occupy more than $90 \%$ of the total kinetic plasma energy density, but strengthening the guide magnetic field suppresses the efficiency of the nonthermal particle acceleration. In nonrelativistic reconnection for anti-parallel magnetic field, most dissipated magnetic field energy is converted into thermal plasma heating. For a weak guide magnetic field with a moderate value, however, the nonthermal particle acceleration efficiency was enhanced, but strengthening the guide-field beyond the moderate value suppresses the efficiency.
Transverse currents in spin transistors
Creators: name: Sahoo, Bijay Kumar
name: Soori, Abhiram
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In many systems, planar Hall effect wherein transverse signal appears in response to longitudinal stimulus is rooted in spin-orbit coupling. A spin transistor put forward by Datta and Das on the other hand consists of ferromagnetic leads connected to spin-orbit coupled central region and its conductance can be controlled by tuning the strength of spin-orbit coupling. We find that transverse currents also appear in Datta-Das transistors made by connecting two two-dimensional ferromagnetic reservoirs to a central spin-orbit coupled two-dimensional electron gas. We find that the spin transistor exhibits a nonzero transverse conductivity which depends on the direction of polarization in ferromagnets and the location where it is measured. We study the conductivities for the system with finite and infinite widths. The conductivities exhibit Fabry-Pérot type oscillations as the length of the spin-orbit coupled regions is varied. Interestingly, even in the limit when longitudinal conductivity is made zero by cutting off the junction between the central spin-orbit coupled region and the ferromagnetic lead on one side (right), the transverse conductivities remain nonzero in the regions that are on the left side of the cut-off junction.
description: 7 pages, 7 captioned figures
Structure-preserving discretizations of two-phase Navier-Stokes flow using fitted and unfitted approaches
Creators: name: Garcke, Harald
name: Nürnberg, Robert
name: Zhao, Quan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the numerical approximation of a sharp-interface model for two-phase flow, which is given by the incompressible Navier-Stokes equations in the bulk domain together with the classical interface conditions on the interface. We propose structure-preserving finite element methods for the model, meaning in particular that volume preservation and energy decay are satisfied on the discrete level. For the evolving fluid interface, we employ parametric finite element approximations that introduce an implicit tangential velocity to improve the quality of the interface mesh. For the two-phase Navier-Stokes equations, we consider two different approaches: an unfitted and a fitted finite element method, respectively. In the unfitted approach, the constructed method is based on an Eulerian weak formulation, while in the fitted approach a novel arbitrary Lagrangian-Eulerian (ALE) weak formulation is introduced. Using suitable discretizations of these two formulations, we introduce two finite element methods and prove their structure-preserving properties. Numerical results are presented to show the accuracy and efficiency of the introduced methods.
Tailored approach to sleep health education (TASHE): study protocol for a web-based randomized controlled trial
Creators: name: Williams, Natasha J.
name: Robbins, Rebecca
name: Rapoport, David
name: Allegrante, John P.
name: Cohall, Alwyn T.
name: Ogedegbe, Gbenga
name: Jean-Louis, Giardin
Publisher: name: Columbia University
Year: 2016
Subjects: Sleep--Health aspects
Health education
Web-based instruction
Sleep apnea syndromes
African Americans
Clinical trials

description: Background: Obstructive sleep apnea (OSA) is a sleep disorder that disproportionately affects African Americans (hereafter referred to as blacks). Moreover, blacks may underutilize sleep services including overnight polysomnography. Thus, OSA among blacks may go undiagnosed and untreated, which has significant health consequences, including hypertension, diabetes, cognitive impairment, and daytime sleepiness. Design and Methods: This two-arm randomized controlled trial will assign 200 participants to a culturally and linguistically tailored web-based sleep educational platform. The website will be developed to ensure that the content is user friendly and that it is readable and acceptable by the target community. Participants will receive login information to a password-protected website and will have access to the website for 2 months. Study assessments will be collected at baseline, 2 months (post-enrollment) and at 6 months (follow-up). We will use qualitative and quantitative methods to develop tailored materials and to ascertain whether tailored materials will increase OSA knowledge and OSA health literacy by comparing blacks exposed to tailored materials versus those exposed to standard sleep health literature. We hypothesize that exposure to tailored OSA information will improve OSA health literacy. Discussion: Few studies have investigated the racial/ethnic disparities in relation to OSA screening and treatment comparing blacks and whites. Moreover, we know of no interventions designed to increase OSA knowledge and health literacy among blacks. Use of the Internet to disseminate health information is growing in this population. Thus, the Internet may be an effective means to increase OSA health literacy, thereby potentially increasing utilization of sleep-related services in this population.
Swing Amplification and the Gaia Phase Spirals
Creators: name: Widrow, Lawrence M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We explore the interplay between in-plane and vertical dynamics in stellar discs within the framework of the shearing box approximation. Julian and Toomre used the shearing sheet to show that leading density waves are amplified as they swing into a trailing ones. We extend their formalism into the dimension perpendicular to the disc and obtain explicit solutions for the response of a disc to an impulsive, external excitation. An excitation that is is symmetric about the mid plane produces a density/breathing wave as well as two-armed phase spirals in the vertical phase space plane. On the other hand, an excitation that is antisymmetric about the mid plane leads to a bending wave and single-armed phase spirals. In either case, self-gravity plays a crucial role in driving the evolution of the disturbance and determining the amplitude and pitch angle of the ensuing spirals. We also show that when the disc is excited by a co-rotating cloud, it develops stationary phase spirals in the wake of the cloud. The results call into question simple kinematic arguments that have been used to determine the age of the phase spirals seen in the Gaia survey
description: 10 pages, 11 figures, submitted to MNRAS
Remarks on profinite groups having few open subgroups
Creators: name: Segal, Dan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: Examples are given of profinite groups that are not strongly complete, and have other `bad' properties, yet have only finitely many open subgroups of each finite index. It is shown that a profinite group with the latter property must be finite if it has finite exponent. The problem of characterizing strongly complete groups in terms of their power subgroups is discussed.
description: The paper has been rewritten and expanded, with some new material. Similar examples appear in N. Nikolov: Algebraic properties of profinite groups, arXiv:1108.5130 and in the earlier versions of this note
title: Μέθοδοι διαχείρισης μνήμης σε διακομιστές μεσολάβησης για πλήρη και μερική παρακολούθηση βίντεο σε πραγματικό χρόνο
Creators: name: Θεοδώρου Μαρία
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
title: Αναγνώριση των μοντέλων παραμετρικού διατοιχισμού φορτηγών πλοίων σε κυματισμούς χρησιμοποιώντας τη μέθοδο του παρατηρητή RISE
Creators: name: Ασλανίδης Χρήστος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
title: Ανάπτυξη γραφικού κέλυφους της γλώσσας προγραμματισμού C για την υποστήριξη μαθημάτων εκμάθησης προγραμματισμού
Creators: name: Κυφωνίδης Χαράλαμπος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
Proposal for a loophole-free Bell test based on spin-photon interactions in cavities
Creators: name: Brunner, Nicolas
name: Young, Andrew B.
name: Hu, Chengyong
name: Rarity, John G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a scheme to demonstrate loophole-free Bell inequality violation where the entanglement between photon pairs is transferred to solid state (spin) qubits mediated by cavity QED interactions. As this transfer can be achieved in a heralded way, our scheme is basically insensitive to losses on the channel. This makes it appealing for the implementation of quantum information protocols based on nonlocality, such as device-independent quantum key distribution. We consider potential experimental realisations of our scheme using single atom, colour centre and quantum dot cavity systems.
description: 7 pages, 4 figures
title: Ανάπτυξη συστήματος με βιοαισθητήρες για ανίχνευση ουσιών με την μέθοδο BERA
Creators: name: Λοµιζου Κωνσταντίνος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
The geometric algebra of Fierz identities in arbitrary dimensions and signatures
Creators: name: Lazaroiu, C. I.
name: Babalic, E. M.
name: Coman, I. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We use geometric algebra techniques to give a synthetic and computationally efficient approach to Fierz identities in arbitrary dimensions and signatures, thus generalizing previous work. Our approach leads to a formulation which displays the underlying real, complex or quaternionic structure in an explicit and conceptually clear manner and is amenable to implementation in various symbolic computation systems. We illustrate our methods and results with a few examples which display the basic features of the three classes of pin representations governing the structure of such identities in various dimensions and signatures.
description: 77 pages; version published in JHEP in 2013
Coarse-grained effective Hamiltonian via the Magnus Expansion for a three-level system
Creators: name: Macrì, Nicola
name: Giannelli, Luigi
name: Paladino, Elisabetta
name: Falci, Giuseppe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum state processing is one of the main tools of quantum technologies. While real systems are complicated and/or may be driven by non-ideal control they may nevertheless exhibit simple dynamics approximately confined to a low-energy Hilbert subspace. Adiabatic elimination is the simplest approximation scheme allowing us to derive in certain cases an effective Hamiltonian operating in a low-dimensional Hilbert subspace. However, these approximations may present ambiguities and difficulties hindering a systematic improvement of their accuracy in larger and larger systems. Here we use the Magnus expansion as a systematic tool to derive ambiguity-free effective Hamiltonians. We show that the validity of the approximations ultimately leverages only on a properly done coarse-graining in time of the exact dynamics. We validate the accuracy of the obtained effective Hamiltonians with suitably tailored fidelities of quantum operations.
Matrix Quantization of Gravitational Edge Modes
Creators: name: Donnelly, William
name: Freidel, Laurent
name: Moosavian, Seyed Faroogh
name: Speranza, Antony J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Gravitational subsystems with boundaries carry the action of an infinite-dimensional symmetry algebra, with potentially profound implications for the quantum theory of gravity. We initiate an investigation into the quantization of this corner symmetry algebra for the phase space of gravity localized to a region bounded by a 2-dimensional sphere. Starting with the observation that the algebra $\mathfrak{sdiff}(S^2)$ of area-preserving diffeomorphisms of the 2-sphere admits a deformation to the finite-dimensional algebra $\mathfrak{su}(N)$, we derive novel finite-$N$ deformations for two important subalgebras of the gravitational corner symmetry algebra. Specifically, we find that the area-preserving hydrodynamical algebra $\mathfrak{sdiff}(S^2)\oplus_{\mathcal{L}}\mathbb{R}^{S^2}$ arises as the large-$N$ limit of $\mathfrak{sl}(N,\mathbb C)\oplus\mathbb{R}$ and that the full area-preserving corner symmetry algebra $\mathfrak{sdiff}(S^2)\oplus_{\mathcal{L}}\mathfrak{sl}(2,\mathbb{R})^{S^2}$ is the large-$N$ limit of the pseudo-unitary group $\mathfrak{su}(N,N)$. We find matching conditions for the Casimir elements of the deformed and continuum algebras and show how these determine the value of the deformation parameter $N$ as well as the representation of the deformed algebra associated with a quantization of the local gravitational phase space. Additionally, we present a number of novel results related to the various algebras appearing, including a detailed analysis of the asymptotic expansion of the $\mathfrak{su}(N)$ structure constants, as well as an explicit computation of the full $\mathfrak{diff}(S^2)$ structure constants in the spherical harmonic basis. A consequence of our work is the definition of an area operator which is compatible with the deformation of the area-preserving corner symmetry at finite $N$.
description: v3: 57 pages + Appendices + References = 99 pages; Typos fixed; Published in JHEP
title: Ανάπτυξη πρότυπου συστήματος μη καταστροφικού ελέγχου υλικών με τη χρήση της ηλεκτρο-μηχανικής εμπέδησης
Creators: name: Ζαχαράκης Ιωάννης Α.
Publisher: name: Technical University of Crete
Year: 2006

description: φ. 1: Εισαγωγή -- Κεφ. 2: "Ευφυές" κατασκευές και "ευφυή" υλικά -- Κεφ. 3: "Ευφυείς" ενεργοποιητές και αισθητήρες -- Κεφ. 4: Πιεζοηλεκτρικά κεραμικά -- Κεφ. 5: Μέθοδος σύνθετης αντίστασης -- Κεφ. 6: Σύνθετη αντίσταση - εμπέδηση
WFIRST Planet Masses from Microlens Parallax
Creators: name: Yee, J. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: I present a method using only a few ground-based observations of magnified microlensing events to routinely measure the parallaxes of WFIRST events if WFIRST is in an L2 orbit. This could be achieved for all events with Amax > 30 using target-ofopportunity observations of select WFIRST events, or with a complementary, ground-based survey of the WFIRST field, which can push beyond this magnification limit. When combined with a measurement of the angular size of the Einstein ring, which is almost always measured in planetary events, these parallax measurements will routinely give measurements of the lens masses and hence, the absolute masses of the planets. They can also lead to mass measurements for dark, isolated objects such as brown dwarfs, free-floating planets, and stellar remnants if the size of the Einstein ring is measured.
description: 11 pages, 2 figures. Replaced 10/10/13 to reflect the version published in ApJL
Varying Calcium Abundances in Solar Flares seen by Solar Maximum Mission
Creators: name: Sylwester, Barbara
name: Sylwester, Janusz
name: Phillips, Kenneth J. H.
name: Kepa, Anna K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report on calcium abundance $A({\rm Ca})$ estimates during the decay phases of 194 solar X-ray flares using archived data from the Bent Crystal Spectrometer (BCS) on Solar Maximum Mission (operational 1980~--~1989). The abundances are derived from the ratio of the total calcium X-ray line emission in BCS channel~1 to that in neighboring continuum, with temperature from a satellite-to-resonance line ratio. Generally the calcium abundance is found to be about three times the photospheric abundance, as previously found, indicating a ``FIP'' (first ionization potential) effect for calcium which has a relatively low FIP value. The precision of the abundance estimates (referred to hydrogen on a logarithmic scale with $A({\rm H}) = 12$), is typically $\sim \pm 0.01$, enabling any time variations of $A({\rm Ca})$ during the flare decay to be examined. For a total of 270 short time segments with $A({\rm Ca})$ determined to better than 2.3\% accuracy, many (106; 39\%) showed variations in $A({\rm Ca})$ at the $3σ$ level. For the majority, 74 (70\%) of these 106 segments $A({\rm Ca})$ decreased with time, and for 32 (30\%) $A({\rm Ca})$ increased with time. For 79 out of 270 (29\%) we observed constant or nearly constant $A({\rm Ca})$, and the remaining 85 (31\%) with irregular time behavior. A common feature was the presence of discontinuities in the time behavior of $A({\rm Ca})$. Relating these results to the ponderomotive force theory of Laming, we attribute the nature of varying $A({\rm Ca})$ to the emergence of loop structures in addition to the initial main loop, each with its characteristic calcium abundance.
description: Astrophysical Journal (to be published). 14 pages with 8 figures
Beyond the Unnameable
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Politics and government
Sports

description: A call in about Muhammad Ali, sports, Nixon, the Bay of Pigs, the Criminal Code Reform Act of 1973, communism, and the deep state. It is believed to be 1974 from a mention of the Mets losing the world series the prior year
title: Βιοτεχνολογία & αγροδιατροφικό σύστημα
Creators: name: Μανουσάκη Ζαχαρένια
Publisher: name: Technical University of Crete
Year: 2007

description:  Εισαγωγή -- 2. Το πέρασμα από τη φυσική στη βιολογία -- 3. Η εκμηχάνιση της αγροτικής παραγωγής -- 4. Από την "Πράσινη Επανάσταση" στην "Βιοτεχνολογική Επανάσταση" -- 5. Ιστορική προέλευση της βιοτεχνολογίας και των γενετικά τροποποιημένων οργανισμών -- 6. Δυνατότητες και εφαρμογές της βιοτεχνολογίας -- 7. Ποιους κινδύνους ενέχουν οι γενετικά τροποποιημένοι οργανισμοί -- 8. Βιοτεχνολογία και βιοηθική -- 9. Η συνύπαρξη γενετικά τροποποιημένων καλλιεργειών με συμβατικές και βιολογικές καλλιέργειες -- 10. Γενετικά τροποποιημένοι οργανισμοί: διεθνές, κοινοτικό και εθνικό δίκαιο -- 11. Στατιστικά στοιχεία για τους γενετικά τροποποιημένους οργανισμούς
Pure spinors, intrinsic torsion and curvature in odd dimensions
Creators: name: Taghavi-Chabert, Arman
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the geometric properties of a $(2m+1)$-dimensional complex manifold $\mathcal{M}$ admitting a holomorphic reduction of the frame bundle to the structure group $P \subset \mathrm{Spin}(2m+1,\mathbb{C})$, the stabiliser of the line spanned by a pure spinor at a point. Geometrically, $\mathcal{M}$ is endowed with a holomorphic metric $g$, a holomorphic volume form, a spin structure compatible with $g$, and a holomorphic pure spinor field $ξ$ up to scale. The defining property of $ξ$ is that it determines an almost null structure, i.e.\ an $m$-plane distribution $\mathcal{N}_ξ$ along which $g$ is totally degenerate. We develop a spinor calculus, by means of which we encode the geometric properties of $\mathcal{N}_ξ$ and of its rank-$(m+1)$ orthogonal complement $\mathcal{N}_ξ^\perp$ corresponding to the algebraic properties of the intrinsic torsion of the $P$-structure. This is the failure of the Levi-Civita connection $\nabla$ of $g$ to be compatible with the $P$-structure. In a similar way, we examine the algebraic properties of the curvature of $\nabla$. Applications to spinorial differential equations are given. Notably, we relate the integrability properties of $\mathcal{N}_ξ$ and $\mathcal{N}_ξ^\perp$ to the existence of solutions of odd-dimensional versions of the zero-rest-mass field equation. We give necessary and sufficient conditions for the almost null structure associated to a pure conformal Killing spinor to be integrable. Finally, we conjecture a Goldberg--Sachs-type theorem on the existence of a certain class of almost null structures when $(\mathcal{M},g)$ has prescribed curvature. We discuss applications of this work to the study of real pseudo-Riemannian manifolds.
description: Odd-dimensional version of arXiv:1212.3595 v2: Presentation improved. A number of corrections made: diagrams describing the curvature and intrinsic torsion classification; Geometric interpretation of spinorial equations; some errors in formulae now fixed. Some material regarding parallel spinors removed (to be including in a separate article) v3: as published
Distance mentoring of health researchers: Three case studies across the career-development trajectory
Creators: name: Xu, Xiaomeng
name: Schneider, Margaret
name: DeSorbo-Quinn, Alexandra L.
name: King, Abby C.
name: Allegrante, John P.
name: Nigg, Claudio
Publisher: name: Columbia University
Year: 2017
Subjects: Mentoring
Distance education
Health--Research
Career development

description: Despite the crucial role of mentoring, little literature exists that addresses distance mentoring among health researchers. This article provides three case studies showcasing protégés at different stages of career development (one in graduate school, one as an early-stage researcher, and one as an established researcher). Each case study provides a brief history of the relationship, examines the benefits and challenges of working together at a distance, and discusses the lessons learned from both the mentor and the protégé over the course of these relationships. A mentoring model, examples of mentoring communications, and potential promising practices are also provided and discussed.
Gravitational lensing by a charged spherically symmetric black hole immersed in thin dark matter
Creators: name: Gao, Xiao-Jun
name: Yan, Xiao-kun
name: Yin, Yihao
name: Hu, Ya-Peng
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the gravitational lensing effect around a spherically symmetric black hole, whose metric is obtained from the Einstein field equation with electric charge and perfect-fluid dark matter contributing to its energy-momentum tensor. We do the calculation analytically in the weak field limit and we assume that both the charge and the dark matter are much less abundant (only give rise to the next-leading-order contribution) in comparison to the black hole mass. In particular, we derive the light deflection angle and the size of the Einstein ring, where approximations up to the next-leading order are done with extra care, especially for the logarithmic term from perfect-fluid dark matter. We expect our results will be useful in the future to relate the theoretical model of perfect fluid dark matter with observations of celestial bodies immersed in thin dark matter.
description: 14 pages, 3 figures; v2: adding some references
title: Κβαντικοί αλγόριθμοι έρευνας σε μη δομημένες βάσεις δεδομένων
Creators: name: Κωνσταντάκης Χρήστος
Publisher: name: Technical University of Crete
Year: 2007

description: φ. 0: Μαθηματικός φορμαλισμός -- Κεφ. 1: Ο αλγόριθμος του Grover -- Κεφ. 2: Κβαντικός θόρυβος στον αλγόριθμο του Grover -- Κεφ. 3: Εντροπία von Neumann στην αναζήτηση υπό κβαντικό θόρυβο
Strength of the nonlocality of two-qubit entangled state and its applications
Creators: name: Garg, Anuma
name: Adhikari, Satyabrata
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-locality is a feature of quantum mechanics that cannot be explained by local realistic theory. It can be detected by the violation of Bell's inequality. In this work, we have considered the evaluation of Bell's inequality with the help of the XOR game. In the XOR game, a two-qubit entangled state is shared between the two distant players. It may generate a non-local correlation between the players which contributes to the maximum probability of winning of the game. We have aimed to determine the strength of the non-locality through XOR game. Thus, we have defined a quantity $S_{NL}$ called the strength of non-locality, purely on the basis of the maximum probability of winning of the XOR game. We have also derived the relation between the introduced quantity $S_{NL}$ and the quantity $M$ introduced in \cite{horo3}, to study the non-locality of a two-qubit entangled state problem in depth. The quantity $M$ may be defined as the sum of the two largest eigenvalues of the correlation matrix of the given entangled state and it determines whether the given entangled state under probe is non-local. Further, we have explored the non-locality of any two-qubit entangled state, whose non-locality cannot be detected by the CHSH inequality. Interestingly, we have found that the newly defined quantity $S_{NL}$ fails to detect non-locality for the entangled state, when the witness operator corresponding to $CHSH$ operator cannot detect the entangled state. To overcome this problem, we have modified the definition of the strength of non-locality and have shown that the modified definition may detect the non-locality of such entangled states, which were earlier undetected by $S_{NL}$. Furthermore, we have also provided two applications of the strength $S_{NL}$ of the non-locality in controlled quantum teleportation and linkage of non-locality of three qubit state to two-qubit state.
description: 17 pages, 3 figures, 1 table, Comments are welcome, Accepted in Physica Scripta
The Long-term Monitoring Results of Insight-HXMT in the First 4 Yr Galactic Plane Scanning Survey
Creators: name: Wang, Chen
name: Liao, Jin-Yuan
name: Guan, Ju
name: Liu, Yuan
name: Li, Cheng-Kui
name: Sai, Na
name: Luo, Qi
name: Jin, Jing
name: Nang, Yi
name: Zhang, Shuang-Nan
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The first X-ray source catalog of Insight-HXMT Galactic Plane (|b|<10deg) Scanning Survey (GPSS) is presented based on the data accumulated from June 2017 to August 2021. The 4 yr limit sensitivities at main energy bands can reach 8.2x10^(-12) erg/s/cm^2} (2-6 keV), 4.21x10^(-11) erg/s/cm^2 (7-40 keV) and 2.78x10^(-11) erg/s/cm^2 (25-100 keV). More than 1300 sources have been monitored at a wide band (1$-$100\,keV), of which 223 sources have a signal-to-noise ratio greater than 5. We combined the GPSS data of Insight-HXMT and MAXI and found it is feasible to obtain more complete long-term light curves from their scanning results. The flux variabilities at different energy bands of the 223 bright sources are analyzed based on the excess variances. It is found that the fluxes of X-ray binaries are more active than those of supernova remnants and isolated pulsars. Different types of binaries, e.g., low-mass X-ray binaries (LMXBs), high-mass X-ray binaries (HMXBs), neutron star binaries, and black hole binaries, also distinctively show different regularities. In addition, the relations between the hardness ratio (HR) and excess variances, and HR and source types are analyzed. It is obvious that the HRs of HMXBs tend to be harder than those of LMXBs and HMXBs tend to be more active than those of LMXBs.
description: 43 pages, 26 figures, accepted for publication in ApJS