cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Ανάλυση συστήματος αντιστήριξης ορύγματος εκσκαφής κατά τη θεμελίωση της επέκτασης της κλινικής Γαβριλάκη στην πόλη των Χανίων
Creators: name: Κωνσταντινίδου Νικολέτα
Publisher: name: Technical University of Crete
Year: 2004

description: Μη διαθέσιμο
Nikolaus von Kues: Vis creativa. Grundlagen eines modernen Menschenbildes. Eine lateinische Auswahl. Eingeleitet, erläutert und herausgegeben von Harald Schwaetzer. Mit einem Vorwort von Klaus Reinhardt und Beiträgen von Anne Maria Gehlen, Gabriele Neusius und Steffen Möller
Creators: name: Belde, Dieter
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Nikolaus von Kues: Vis creativa. Grundlagen eines modernen Menschenbildes. Eine lateinische Auswahl. Eingeleitet, erläutert und herausgegeben von Harald Schwaetzer. Mit einem Vorwort von Klaus Reinhardt und Beiträgen von Anne Maria Gehlen, Gabriele Neusius und Steffen Möller. Münster: Aschendorff 2000, 160 S., kartoniert (ISBN 3-402- 02308-3).
description: Forum Classicum, Nr. 1 (2001): Forum Classicum
Robust adaptive variable selection in ultra-high dimensional linear regression models
Creators: name: Ghosh, Abhik
name: Jaenada, María
name: Pardo, Leandro
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Evolutionary Biology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Infectious Diseases
subject: FOS: Health sciences

description: We consider the problem of simultaneous variable selection and parameter estimation in an ultra-high dimensional linear regression model. The adaptive penalty functions are used in this regard to achieve the oracle variable selection property with simpler assumptions and lesser computational burden. Noting the non-robust nature of the usual adaptive procedures (e.g. adaptive LASSO) based on the squared error loss function against data contamination, quite frequent with modern large-scale data sets (e.g. noisy gene expression data, spectra and spectral data), in this paper, we present a new adaptive regularization procedure using a robust loss function based on the density power divergence (DPD) measure under a general class of error distributions. We theoretically prove that the proposed adaptive DPD-LASSO estimator of the regression coefficients is highly robust, consistent, asymptotically normal and leads to robust oracle-consistent variable selection under easily verifiable assumptions. Numerical illustrations are provided for the mostly used normal and heavy-tailed error densities. Finally, the proposal is applied to analyse an interesting spectral dataset, in the field of chemometrics, regarding the electron-probe X-ray microanalysis (EPXMA) of archaeological glass vessels from the 16th and 17th centuries.
Deep comparisons of Neural Networks from the EEGNet family
Creators: name: Köllőd, Csaba Márton
name: Adolf, András
name: Márton, Gergely
name: Ulbert, István
Publisher: name: arXiv
Year: 2023
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Most of the Brain-Computer Interface (BCI) publications, which propose artificial neural networks for Motor Imagery (MI) Electroencephalography (EEG) signal classification, are presented using one of the BCI Competition datasets. However, these databases contain MI EEG data from less than or equal to 10 subjects . In addition, these algorithms usually include only bandpass filtering to reduce noise and increase signal quality. In this article, we compared 5 well-known neural networks (Shallow ConvNet, Deep ConvNet, EEGNet, EEGNet Fusion, MI-EEGNet) using open-access databases with many subjects next to the BCI Competition 4 2a dataset to acquire statistically significant results. We removed artifacts from the EEG using the FASTER algorithm as a signal processing step. Moreover, we investigated whether transfer learning can further improve the classification results on artifact filtered data. We aimed to rank the neural networks; therefore, next to the classification accuracy, we introduced two additional metrics: the accuracy improvement from chance level and the effect of transfer learning. The former can be used with different class-numbered databases, while the latter can highlight neural networks with sufficient generalization abilities. Our metrics showed that the researchers should not avoid Shallow ConvNet and Deep ConvNet because they can perform better than the later published ones from the EEGNet family.
Compact stellar structures in Weyl geometric gravity
Creators: name: Haghani, Zahra
name: Harko, Tiberiu
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the structure and physical properties of specific classes of neutron, quark, and Bose-Einstein Condensate stars in the conformally invariant Weyl geometric gravity theory. The basic theory is derived from the simplest conformally invariant action, constructed, in Weyl geometry, from the square of the Weyl scalar, the strength of the Weyl vector, and a matter term, respectively. The action is linearized in the Weyl scalar by introducing an auxiliary scalar field. To keep the theory conformally invariant the trace condition is imposed on the matter energy-momentum tensor. The field equations are derived by varying the action with respect to the metric tensor, Weyl vector field and scalar field. By adopting a static spherically symmetric interior geometry, we obtain the field equations, describing the structure and properties of stellar objects in Weyl geometric gravity. The solutions of the field equations are obtained numerically, for different equations of state of the neutron and quark matter. More specifically, constant density stellar models, and models described by the stiff fluid, radiation fluid, quark bag model, and Bose-Einstein Condensate equations of state are explicitly constructed numerically in both general relativity and Weyl geometric gravity, thus allowing an in depth comparison between the predictions of these two gravitational theories. As a general result it turns out that for all the considered equations of state, Weyl geometric gravity stars are more massive than their general relativistic counterparts. As a possible astrophysical application of the obtained results we suggest that the recently observed neutron stars, with masses in the range of 2$M_{\odot}$ and 3$M_{\odot}$, respectively, could be in fact conformally invariant Weyl geometric neutron or quark stars.
description: 20 pages, 15 figures, accepted for publication in PRD
On k-polycosymplectic Marsden-Weinstein reductions
Creators: name: de Lucas, J.
name: Rivas, X.
name: Vilariño, S.
name: Zawora, B. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C15, 53Z05, 70H33 (primary) 35A30, 35B06 (secondary)

description: We review and slightly improve the known k-polysymplectic Marsden--Weinstein reduction theory by removing some technical conditions on k-polysymplectic momentum maps by developing a theory of affine Lie group actions for k-polysymplectic momentum maps, removing the necessity of their co-adjoint equivariance. Then, we focus on the analysis of a particular case of k-polysymplectic manifolds, the so-called fibred ones, and we study their k-polysymplectic Marsden--Weinstein reductions. Previous results allow us to devise a k-polycosymplectic Marsden--Weinstein reduction theory, which represents one of our main results. Our findings are applied to study coupled vibrating strings and, more generally, k-polycosymplectic Hamiltonian systems with field symmetries. We show that k-polycosymplectic geometry can be understood as a particular type of k-polysymplectic geometry. Finally, a k-cosymplectic to l-cosymplectic geometric reduction theory is presented, which reduces, geometrically, the space-time variables in a k-cosymplectic framework. An application of this latter result to a vibrating membrane with symmetries is given.
description: 49 pages. Revised version. Added a reduction procedure of the space-time coordinates
Pair production as a probe for the dynamics of nuclear fission and $α$ decay
Creators: name: Settlemyre, Thomas
name: Zheng, Hua
name: Bonasera, Aldo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Electron-positron pairs can be produced via the Schwinger mechanism in the presence of strong electric fields. In particular, the fields involved in $α$ decay and nuclear fission are strong enough to produce them. The energy of the $e^+e^-$ pair is related to the relative distance and velocity of the daughter nuclei. Thus, the energy distribution of the produced pairs can give information about the dynamics of the fission and $α$ decay processes. A neck model of nuclear fission is used to illustrate how the pairs can be used as a probe of the dynamics.
description: 4 pages, 4 figures
[Gymnasium 109, 2002, H. 4 / Historische Zeitschrift 274, 2002, H. 3 / Hermes 130, 2002, H. 2 …]
Creators: name: Mensching, Eckart
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 3 (2002): Forum Classicum
title: Επιπτώσεις στην οικονομική λειτουργία των συστημάτων ηλεκτρικής ενέργειας Κρήτης και Κύπρου λόγω της διασύνδεσής τους
Creators: name: Αντωνίου Αντώνιος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
A Novel Collaborative Self-Supervised Learning Method for Radiomic Data
Creators: name: Li, Zhiyuan
name: Li, Hailong
name: Ralescu, Anca L.
name: Dillman, Jonathan R.
name: Parikh, Nehal A.
name: He, Lili
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The computer-aided disease diagnosis from radiomic data is important in many medical applications. However, developing such a technique relies on annotating radiological images, which is a time-consuming, labor-intensive, and expensive process. In this work, we present the first novel collaborative self-supervised learning method to solve the challenge of insufficient labeled radiomic data, whose characteristics are different from text and image data. To achieve this, we present two collaborative pretext tasks that explore the latent pathological or biological relationships between regions of interest and the similarity and dissimilarity information between subjects. Our method collaboratively learns the robust latent feature representations from radiomic data in a self-supervised manner to reduce human annotation efforts, which benefits the disease diagnosis. We compared our proposed method with other state-of-the-art self-supervised learning methods on a simulation study and two independent datasets. Extensive experimental results demonstrated that our method outperforms other self-supervised learning methods on both classification and regression tasks. With further refinement, our method shows the potential advantage in automatic disease diagnosis with large-scale unlabeled data available.
description: 14 pages, 7 figures
Topological stirring of two-dimensional atomic Bose-Einstein condensates
Creators: name: White, Angela
name: Proukakis, Nick
name: Barenghi, Carlo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We stir vortices into a trapped quasi two-dimensional atomic Bose-Einstein condensate by moving three laser stirrers. We apply stirring protocols introduced by Boyland et. al. (2000) that efficiently build in topological chaos in classical fluids and are classified as Pseudo-Anosov stirring protocols. These are compared to their inefficient mixing counterparts, finite-order stirring protocols. We investigate if inefficient stirring protocols result in a more clustered distribution of vortices. The efficiency with which vortices are 'mixed' or distributed in a condensate is important for investigating dynamics of continuously forced quantum turbulence and the existence of the inverse cascade in turbulent two-dimensional superfluids.
description: 12 pages, 6 figures, submitted to Isaac Newton Institute TOD conference proceedings "Knotted, Linked and Tangled Flux in Quantum and Classical Systems"
The Changing Landscape of Developmental Education Practices: Findings from a National Survey and Interviews with Postsecondary Institutions
Creators: name: Rutschow, Elizabeth Zachry
name: Cormier, Maria Scott
name: Dukes, Dominique Chevelle
name: Zamora, Diana E. Cruz
Publisher: name: Columbia University
Year: 2019
Subjects: Universities and colleges--Curricula
Developmental studies programs
College students--Services for
Education, Higher--Administration
Educational change

description: Research suggests that far more students are referred to developmental education courses than necessary, and that developmental education presents a barrier to students’ success. As a result, many in the field have called for reforms to developmental education to address these challenges. This CAPR report documents developmental education practices used in broad-access two- and four-year colleges across the country based on a 2016 survey of public two- and four-year colleges and private, nonprofit four-year colleges as well as interviews with institutional and state leaders. It examines practices in assessment, placement, instruction, and support services and finds that many colleges are experimenting with changes to traditional developmental education. A growing number of public colleges are using measures in addition to standardized tests, such as high school grades, to assess college readiness. Additionally, many colleges are implementing instructional reforms. The most prevalent of these are compressing developmental courses into shorter periods, offering diverse math courses that align with students’ careers, allowing students to determine their own learning pace, and integrating developmental reading and writing instruction into one course. However, while widespread, these reforms typically reach less than half of students at the colleges. Key findings: Most two-year and four-year public colleges offer developmental courses, though they are more prevalent at two-year colleges. Multisemester prerequisite sequences make up a substantial proportion of these courses. Most colleges use standardized tests to assess students’ college readiness. However, since 2011, there has been a 30-percentage-point increase in the proportion of colleges using multiple measures to assess students’ college readiness. The most popular additional measure used is high school performance. Many colleges, particularly two-year colleges, are experimenting with different instructional approaches in developmental education; however, these approaches tend to make up less than half of colleges’ overall developmental course offerings.
Self-supervised learning of Split Invariant Equivariant representations
Creators: name: Garrido, Quentin
name: Najman, Laurent
name: Lecun, Yann
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Recent progress has been made towards learning invariant or equivariant representations with self-supervised learning. While invariant methods are evaluated on large scale datasets, equivariant ones are evaluated in smaller, more controlled, settings. We aim at bridging the gap between the two in order to learn more diverse representations that are suitable for a wide range of tasks. We start by introducing a dataset called 3DIEBench, consisting of renderings from 3D models over 55 classes and more than 2.5 million images where we have full control on the transformations applied to the objects. We further introduce a predictor architecture based on hypernetworks to learn equivariant representations with no possible collapse to invariance. We introduce SIE (Split Invariant-Equivariant) which combines the hypernetwork-based predictor with representations split in two parts, one invariant, the other equivariant, to learn richer representations. We demonstrate significant performance gains over existing methods on equivariance related tasks from both a qualitative and quantitative point of view. We further analyze our introduced predictor and show how it steers the learned latent space. We hope that both our introduced dataset and approach will enable learning richer representations without supervision in more complex scenarios. Code and data are available at https://github.com/facebookresearch/SIE.
title: Διασύνδεση ΣΗΕ Κύπρου-Κρήτης. Μελέτη στη μόνιμη κατάσταση λειτουργίας
Creators: name: Θεοδώρου Νικόλας
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
Many-body correlations in one-dimensional optical lattices with alkaline-earth(-like) atoms
Creators: name: Bilokon, Valeriia
name: Bilokon, Elvira
name: Bañuls, Mari Carmen
name: Cichy, Agnieszka
name: Sotnikov, Andrii
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We explore the rich nature of correlations in the ground state of ultracold atoms trapped in state-dependent optical lattices. In particular, we consider interacting fermionic ytterbium or strontium atoms, realizing a two-orbital Hubbard model with two spin components. We analyze the model in one-dimensional setting with the experimentally relevant hierarchy of tunneling and interaction amplitudes by means of exact diagonalization and matrix product states approaches, and study the correlation functions in density, spin, and orbital sectors as functions of variable densities of atoms in the ground and metastable excited states. We show that in certain ranges of densities these atomic systems demonstrate strong density-wave, ferro- and antiferromagnetic, as well as antiferroorbital correlations.
description: 8 pages, 5 figures
Arbogast Schmitt: Die Moderne und Platon
Creators: name: Chwalek, Burkard
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Arbogast Schmitt: Die Moderne und Platon. J. B. Metzler, Stuttgart, Weimar 2003, 584 S., (ISBN3-476-01949-7).
description: Forum Classicum, Nr. 1 (2004): Forum Classicum
Towards Goldilocks Zone in Child-centered AI
Creators: name: Chowdhury, Tahiya
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Using YouTube Kids as an example, in this work, we argue the need to understand a child's interaction process with AI and its broader implication on a child's emotional, social, and creative development. We present several design recommendations to create value-driven interaction in child-centric AI that can guide designing compelling, age-appropriate, beneficial AI experiences for children.
description: 4 pages
Gravitational radiation with kinetic recoil
Creators: name: Lynch, Morgan H.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this manuscript, we examine the gravitational radiation emitted by binary systems using an Unruh-DeWitt detector coupled to gravitons. Recoil is incorporated into the system via a kinetic energy term in the energy gap of the detector. We find a splitting of the gravitational wave frequency due to the recoil. Implications for the recoil velocity and force are discussed.
description: 10 pages, 2 figures. Accepted for publication at Phys. Rev. D
The strange (hi)story of particles and waves
Creators: name: Zeh, H. Dieter
Publisher: name: arXiv
Year: 2013
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This is a non-technical presentation (in historical context) of the quantum theory that is strictly based on global unitarity. While the first part was written for a general readership, Sect. 5 may appear a bit provocative. I argue that the single-particle wave functions of quantum mechanics have to be correctly interpreted as field modes that are "occupied once" (that is, first excited states of the corresponding quantum oscillators in the case of a boson field). Multiple excitations lead non-relativistically to apparent many-particle wave functions, while the quantum states proper are defined by wave function(al)s on the configuration space of fundamental fields, or on another, as yet elusive, fundamental basis.
description: Review article (regularly updated) - v2-v23: many arguments, comments and references added; two new sections; new abstract - v15: published - v23: 42 pages pdf, 2 figures
What Makes a Code Review Useful to OpenDev Developers? An Empirical Investigation
Creators: name: Turzo, Asif Kamal
name: Bosu, Amiangshu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Context: Due to the association of significant efforts, even a minor improvement in the effectiveness of Code Reviews(CR) can incur significant savings for a software development organization. Aim: This study aims to develop a finer grain understanding of what makes a code review comment useful to OSS developers, to what extent a code review comment is considered useful to them, and how various contextual and participant-related factors influence its usefulness level. Method: On this goal, we have conducted a three-stage mixed-method study. We randomly selected 2,500 CR comments from the OpenDev Nova project and manually categorized the comments. We designed a survey of OpenDev developers to better understand their perspectives on useful CRs. Combining our survey-obtained scores with our manually labeled dataset, we trained two regression models - one to identify factors that influence the usefulness of CR comments and the other to identify factors that improve the odds of `Functional' defect identification over the others. Key findings: The results of our study suggest that a CR comment's usefulness is dictated not only by its technical contributions such as defect findings or quality improvement tips but also by its linguistic characteristics such as comprehensibility and politeness. While a reviewer's coding experience positively associates with CR usefulness, the number of mutual reviews, comment volume in a file, the total number of lines added /modified, and CR interval has the opposite associations. While authorship and reviewership experiences for the files under review have been the most popular attributes for reviewer recommendation systems, we do not find any significant association of those attributes with CR usefulness.
title: Ελαχιστοποίηση ρεύματος γείωσης σε αντιστροφείς ισχύος DC/AC τύπου πλήρους γέφυρας χωρίς μετασχηματιστή
Creators: name: Ζωγράφος Δημήτριος
Publisher: name: Technical University of Crete
Year: 2013

description: Μη διαθέσιμο
Accurate dust temperature and star formation rate in the most luminous $z>6$ quasar in the HYPerluminous quasars at the Epoch of ReionizatION (HYPERION) sample
Creators: name: Tripodi, Roberta
name: Feruglio, Chiara
name: Kemper, Francisca
name: Civano, Francesca
name: Costa, Tiago
name: Elvis, Martin
name: Bischetti, Manuela
name: Carniani, Stefano
name: Di Mascia, Fabio
name: D'Odorico, Valentina
name: Fiore, Fabrizio
name: Gallerani, Simona
name: Ginolfi, Michele
name: Maiolino, Roberto
name: Piconcelli, Enrico
name: Valiante, Rosa
name: Zappacosta, Luca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present ALMA Band 9 continuum observation of the ultraluminous quasi-stellar object (QSO) SDSS J0100+2802, providing a $\sim 10σ$ detection at $\sim 670$ GHz. SDSS J0100+2802 is the brightest QSO with the most massive super massive black hole (SMBH) known at $z>6$, and we study its dust spectral energy distribution in order to determine the dust properties and the star formation rate (SFR) of its host-galaxy. We obtain the most accurate estimate so far of the temperature, mass and emissivity index of the dust, having $T_{\rm dust}=48.4\pm2.3$ K, $M_{\rm dust}=(2.29\pm0.83)\times 10^7$ M$_\odot$, $β=2.63\pm 0.23$. This allows us to measure the SFR with the smallest statistical error for this QSO, SFR$=265\pm 32\ \rm M_\odot yr^{-1}$. Our results enable us to evaluate the relative growth of the SMBH and host galaxy of J0100+2802, finding that the SMBH is dominating the process of BH-galaxy growth in this QSO at $z=6.327$, when the Universe was $865$ Myr old. Such unprecedented constraints on the host galaxy SFR and dust temperature can only be obtained through high frequency observations, and highlight the importance of ALMA Band 9 to obtain a robust overview of the build-up of the first quasars' host galaxies at $z>6$.
description: 10 pages, 4 figures, 1 table. Accepted for publication in ApJL
Interpebble contact radius in a comet nucleus
Creators: name: Arakawa, Sota
name: Nishiura, Daisuke
name: Furuichi, Mikito
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In recent years, the gravitational collapse of pebble clumps in the early Solar System has been regarded as a plausible scenario for the origin of comets. In this context, ``pebbles'' represent mm- to cm-sized dust aggregates composed of (sub)micron-sized dust particles, and the structure of km-sized comets is thought to be an agglomerate of pebbles. The contact radius for pebble-pebble contacts was modelled in an earlier study; however, the pressure dependence of the interpebble contact radius was not considered. Here, we revisit the interpebble contact radius in a comet nucleus. We calculated the interpebble contact radius based on JKR contact theory, and we took into consideration the effect of lithostatic pressure. We found that the interpebble contact radius varies with depth from the surface, and the earlier model underestimated it by one order of magnitude at the centre of the comet nucleus.
description: 9 pages, 6 figures. Accepted for publication in MNRAS
The Chocolate Chip Cookie Model: dust-to-metal ratio of HII regions
Creators: name: Lu, Jiafeng
name: Shen, Shiyin
name: Yuan, Fangting
name: Zeng, Qi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using a sample of face-on star-forming galaxies selected from the Sloan Digital Sky Survey, we statistically derive the typical optical depth $τ_{\rm{cl}}$ of individual HII regions based on the ``Chocolate Chip Cookie" model of Lu2022. By binning galaxies into stellar mass and gas-phase metallicity bins and interpreting $τ_{\rm{cl}}$ as the dust to gas ratio (DGR) of HII regions, we further investigate the correlations among DGR and stellar mass, gas-phase metallicity respectively. We find that DGR increases monotonically with the stellar mass of galaxies. At a given stellar mass, DGR shows a linear correlation with the gas-phase metallicity, which implies a constant dust to metal ratio (DTM) of galaxies at a given stellar mass. These results adequately indicate that the DTM of galaxies is simply a function of their stellar masses. In terms of gas-phase metallicity, because of the mass-metalliciy relation, DTM increases with increasing metallicity with a power-law index 1.45 in the low metallicity region, while remains constant at the high metallicity end.
description: 9 pages, 4 figures
BBC World Report
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Coup d'état (Grenada : 1979)

description: A man talks about the political situation of Grenada, which he terms "unfortunate." He talks about the difficulties that the revolution has encountered. He says that the statement is meant to inform the citizenry. He talks about fractured leadership and the difficulties with Maurice Bishop.
Frequencies of $f$- and $p$-oscillation modes in cold and hot compact stars
Creators: name: Thapa, Vivek Baruah
name: Beznogov, Mikhail V.
name: Raduta, Adriana R.
name: Thakur, Pratik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A large collection of equations of state (EOSs) built within the covariant density functional (CDF) theory of hadronic matter and allowing for density dependent (DD) couplings is employed to study polar $f$- and $p$- oscillations of cold and hot compact stars. Correlations between oscillation frequencies of cold purely nucleonic neutron stars (NSs), their global parameters as well as properties of nuclear matter (NM) are investigated by considering a set of models from Beznogov and Raduta, [Phys.~Rev.~C 107, 045803 (2023)], where a number of constraints on the saturation properties of NM, pure neutron matter (PNM) and the lower bound of the maximal NS mass were imposed within a Bayesian framework. The roles of finite temperature and exotic particle degrees of freedom, e.g., hyperons, $Δ$-resonances, anti-kaon condensates or a hadron to quark phase transition, are addressed by employing a family of models publicly available on \textsc{CompOSE} and assuming idealized profiles of temperature or entropy per baryon and charge fraction. We find that finite temperature effects reduce the oscillation frequencies of nucleonic stars while the opposite effect is obtained for stars with exotic particle degrees of freedom. When the $Γ$-law is employed to build finite temperature EOSs, errors in estimating oscillation modes frequencies are of the order of 10\% to 30\%, depending on the mass. Throughout this work the Cowling approximation is used.
description: 12 pages, 7 figures, 2 tables
title: Development of a 3D action role playing game
Creators: name: Κονταδακης Γρηγοριος
Publisher: name: Technical University of Crete
Year: 2013

description: The purpose of this project is the creation of an entertainment 3D Third Person Action Role Playing Game titled Broken Dreams. A 3D game is usually developed by a team of more than one person. Nowadays, high quality games are designed by large teams that consist mainly of art designers, who are responsible for the game content creation, and programmers, who are responsible for the gameplay creation and putting all the pieces together. It is a real challenge to create a one-person project taking responsibility for both the artistic and programming parts respectively.
The Broken Dreams concept takes place in the middle-ages in a small city which is ruled by a vicious monarch. This ruler has deprived people of their dreams and forced them to sleep forever. The only person that is still unaffected by this eternal sleep is the main character of the game. His purpose is to try and wake up the residents of this town from their sleep. There is only one way to do that. By entering people‟s dreams and fighting with their nightmares.
Most of the gameplay involves people‟s dreams, where the character is confronted with nightmares that he must defeat. In order to accomplish this he must unleash Powers (magic skills) upon the nightmares of the city‟s residents. Currently there are ten Powers implemented in the game, which are divided in two categories: Fire and Ice Powers. As the character becomes stronger (by means of power leveling), his powers grow stronger as well.
The AI Players are also divided in two categories: Fire and Ice Pawns. For the AI
movement the typical method used is an A* algorithm due to its low execution time (in comparison to other algorithms) which is crucial in a real-time application. In the current approach, the optimal paths are pre-computed and stored in a 2D array allowing the recovery of an optimal path at O(1) time. So by sacrificing a bit of memory space, optimal time performance is achieved.
The game engine used for the creation of Broken Dreams is Unreal Engine 3 [1] via the Unreal Development Kit (UDK) [2] and UnrealScript [3] tools which are free for noncommercial use. UDK offers a vast amount of control over certain game elements such us meshes, particle systems, animation, sound, physics, etc. UnrealScript is a scripting language with Java-like syntax which focuses on the interactions between game objects, such as attacking an enemy, picking up an object etc. The coordination of Unreal Engine elements can produce extraordinary results which are only limited by the time available for development and one‟s imagination.
In-medium properties of the light and heavy-light mesons in a light-front quark model
Creators: name: Arifi, Ahmad Jafar
name: Hutauruk, Parada. T. P.
name: Tsushima, Kazuo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the in-medium properties of pseudoscalar and vector mesons with the light-light and heavy-light quarks in a light-front quark model, using the in-medium quark properties computed by the quark-meson coupling model. Both models are constructed on an equal footing with the constituent quark degree of freedom. Here, we particularly focus on the weak decay constants and distribution amplitudes (DAs) of the mesons in symmetric nuclear matter. We find that the weak decay constants decrease as nuclear density increases for $π$, $K$, $D$, and $B$ pseudoscalar as well as $ρ$, $K^{*}$, $D^{*}$, and $B^*$ vector mesons, where their properties in free space have good agreement with the available experimental and lattice QCD data. A larger reduction is found for the light-light quark pseudoscalar mesons, while a smaller reduction is found for the heavy-light quark vector mesons, in particular, with the bottom quark. We discuss the effect of the vector potential on the weak decay constants and present our predictions for the in-medium modifications of DAs. Also, a comparison with the free space lattice QCD data is made.
description: 17 pages, 11 figures
Performing private database queries in a real-world environment using a quantum protocol
Creators: name: Chan, Philip
name: Lucio-Martinez, Itzel
name: Mo, Xiaofan
name: Simon, Christoph
name: Tittel, Wolfgang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In the well-studied cryptographic primitive 1-out-of-N oblivious transfer, a user retrieves a single element from a database of size N without the database learning which element was retrieved. While it has previously been shown that a secure implementation of 1-out-of-N oblivious transfer is impossible against arbitrarily powerful adversaries, recent research has revealed an interesting class of private query protocols based on quantum mechanics in a cheat sensitive model. Specifically, a practical protocol does not need to guarantee that database cannot learn what element was retrieved if doing so carries the risk of detection. The latter is sufficient motivation to keep a database provider honest. However, none of the previously proposed protocols could cope with noisy channels. Here we present a fault-tolerant private query protocol, in which the novel error correction procedure is integral to the security of the protocol. Furthermore, we present a proof-of-concept demonstration of the protocol over a deployed fibre.
description: 15 pages, 4 figures
Use of vector polarizability to manipulate alkali-metal atoms
Creators: name: Cho, D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We review a few ideas and experiments that our laboratory at Korea University has proposed and carried out to use vector polarizability βto manipulate alkali-metal atoms. βcomes from spin-orbit coupling, and it produces an ac Stark shift that resembles a Zeeman shift. When a circularly polarized laser field is properly detuned between the D1 and D2 transitions, an ac Stark shift of a ground-state atom takes the form of a pure Zeeman shift. We call it the "analogous Zeeman effect", and experimentally demonstrated an optical Stern-Gerlach effect and an optical trap that behaves exactly like a magnetic trap. By tuning polarization of a trapping beam, and thereby controlling a shift proportional to β, we demonstrated elimination of an inhomogeneous broadening of a ground hyperfine transition in an optical trap. We call it "magic polarization". We also showed significant narrowing of a Raman sideband transition at a special well depth. A Raman sideband in an optical trap is broadened owing to anharmonicity of the trap potential, and the broadening can be eliminated by a beta-induced differential ac Stark shift at what we call a "magic well depth". Finally, we proposed and experimentally demonstrated a cooling scheme that incorporated the idea of velocity-selective coherent population trapping to Raman sideband cooling to enhance cooling efficiency of the latter outside of the Lamb-Dicke regime. We call it "motion-selective coherent population trapping", and βis responsible for the selectivity. We include a program file that calculates both scalar and vector polarizabilities of a given alkali-metal atom when the wavelength of an applied field is specified. It also calculates depth of a potential well and photon-scattering rate of a trapped atom in a specific ground state when power, minimum spot size, and polarization of a trap beam are given.
description: 23 pages, 9 figures. Includes an Excel file to calculate scalar and vector polarizabilities, well depth and photon scattering rate of a given alkali-metal atom for given laser wavelength and intensity. Accepted for publication in Journal of the Korean Physical Society
Humans on Earth: Global extents of anthropogenic land cover from remote sensing
Creators: name: Small, Christopher
name: Sousa, Daniel John
Publisher: name: Columbia University
Year: 2016
Subjects: Remote sensing
Land cover
Nature--Effect of human beings on
Social settlements
Agriculture
Forests and forestry

description: This review provides a perspective of the current state of the art in remote sensing of anthropogenic land cover and human-modified landscapes at global scales. The fact that humans have adapted to almost all of Earth’s environments, yet remain strongly clustered within each of these environments influences both the nature of anthropogenic impact on Earth’s landscapes and the challenges of mapping it. Remote sensing provides a consistent synoptic view of these environments by mapping the land cover associated with the anthropogenic land uses of settlement and food production, as well as their complement in forest cover. We give brief descriptions and illustrative comparisons of several current land cover products representing the global extents of settlements, agriculture and forests derived from remote sensing. To accommodate the challenges inherent to mapping any land cover at widely varying scales, we compare size distributions of spatially contiguous land cover (rather than total area) for several global land cover products. Despite the use of different sensors and different mapping criteria, there is remarkable consistency in the size distributions of these products – both within and across land cover class. Rank-size distributions of settlements, agricultural areas and forests are all well-described by power laws spanning more than four orders of magnitude in both area and number. This consistency in the form of the distributions suggests fundamental similarities among different types of land cover. The observed similarities can be explained by depicting land cover mosaics as co-evolving spatial networks sharing common processes of nucleation, growth and connection.
title: Ανάλυση συμπεριφοράς συστημάτων σεισμικής μόνωσης βάσης για ισχυρές εδαφικές κινήσεις
Creators: name: Ξηρογιάννης Ιωάννης
Publisher: name: Technical University of Crete
Year: 2004

description: φ. 1: Προκαταρτικός σχεδιασμός συστημάτων μόνωσης βάσης -- Κεφ. 2: Παραμετρική μελέτη -- Κεφ. 3: Σχολιασμός αποτελεσμάτων παραμετρικής μελέτης
title: Ερευνητική-τεχνολογική πολιτική και τριτοβάθμια εκπαίδευση στο χώρο της Ευρωπαϊκής Ένωσης
Creators: name: Φραγκεδάκη Κωνσταντίνα
Publisher: name: Technical University of Crete
Year: 2003

description: φ. 1: Η ιστορική διαμόρφωση της έρευνας και τεχνολογίας και ο ρόλος τους στα πλαίσια της παιδείας (τριτοβάθμια εκπαίδευση) και της κοινωνίας -- Κεφ. 2: Τα χαρακτηριστικά και η εξελικτική πορεία του νομικού πλαισίου της Ε.Ε. σχετικά με την ερευνητική, τεχνολογική και εκπαιδευτική πολιτική -- Κεφ. 3: Έρευνα-Τεχνολογία-Εκπαίδευση-Παραγωγή -- Κεφ. 4: Η ουδετερότητα ή μη της έρευνας & τεχνολογίας -- Κεφ. 5: Η ελληνική περίπτωση -- Κεφ. 6: Διερεύνηση-προσανατολισμοί-προβληματισμοί
Detection of Dust in High-Velocity Cloud Complex C -- Enriched Gas Accreting onto the Milky Way
Creators: name: Fox, Andrew J.
name: Cashman, Frances H.
name: Kriss, Gerard A.
name: de Rosa, Gisella
name: Plesha, Rachel
name: Homayouni, Yasaman
name: Richter, Philipp
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the detection of dust depletion in Complex C, a massive, infalling, low-metallicity high-velocity cloud in the northern Galactic hemisphere that traces the ongoing accretion of gas onto the Milky Way. We analyze a very high signal-to-noise HST/COS spectrum of AGN Mrk 817 formed by coadding 165 individual exposures taken under the AGN STORM 2 program, allowing us to determine dust-depletion patterns in Complex C at unprecedented precision. By fitting Voigt components to the O I, S II, N I, Si II, Fe II, and Al II absorption and applying ionization corrections from customized Cloudy photoionization models, we find sub-solar elemental abundance ratios of [Fe/S]=-0.42+/-0.08, [Si/S]=-0.29+/-0.05, and [Al/S]=-0.53+/-0.08. These ratios indicate the depletion of Fe, Si, and Al into dust grains, since S is mostly undepleted. The detection of dust provides an important constraint on the origin of Complex C, as dust grains indicate the gas has been processed through galaxies, rather than being purely extragalactic. We also derive a low metallicity of Complex C of [S/H]=-0.51+/-0.16 (31% solar), confirming earlier results from this sightline. We discuss origin models that could explain the presence of dust in Complex C, including Galactic fountain models, tidal stripping from the Magellanic Clouds or other satellite galaxies, and precipitation of coronal gas onto dust-bearing ``seed" clouds.
description: 8 pages, 3 figures, accepted for publication in ApJ Letters. This version has been updated with proof corrections
title: Καταλυτική αντιμετώπιση πτητικών οργανικών ρύπων (VOCs)
Creators: name: Κουτούση Βασιλική
Publisher: name: Technical University of Crete
Year: 2014

description: Κεφ.1: Εισαγωγή-Σκοπός -- Κεφ.2: Ατμοσφαιρική ρύπανση -- Κεφ.3: Πτητικές οργανιές ενώσεις (VOCs) -- Κεφ. 4: Καταλυτική αντιμετώπιση πτητικών οργανικών ενώσεων -- Κεφ. 5: Πίνακες μετατροπής υδρογονανθράκων
title: Σολιτονικά κυψελιδικά αυτόματα με μηδενικές και με περιοδικές συνοριακές διατάξεις
Creators: name: Κακαβά Βασιλική.
Publisher: name: Technical University of Crete
Year: 1996

description: Μη διαθέσιμο
Crystal field excitation in the chiral helimagnet YbNi$_3$Al$_9$
Creators: name: Tsukagoshi, Mitsuru
name: Kishida, Suguru
name: Kurauchi, Kenshin
name: Ito, Daichi
name: Kubo, Koya
name: Matsumura, Takeshi
name: Ikeda, Yoichi
name: Nakamura, Shota
name: Ohara, Shigeo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Crystal field level scheme of a uniaxial chiral helimagnet YbNi$_3$Al$_9$, exhibiting a chiral magnetic soliton lattice state by Cu substitution for Ni, has been determined by inelastic neutron scattering. The ground and the first excited doublets are separated by 44 K and are simply expressed as $α|\pm 7/2\rangle + β|\mp 5/2\rangle$ with $α$ and $β$ nearly equal to $\pm 1/\sqrt{2}$. The easy axis of the crystal field anisotropy is the $c$ axis when the excited levels are populated at high temperatures and high magnetic fields. On the other hand, the magnetism at low temperatures and low magnetic fields, where only the ground doublet is populated, is described by an easy plane anisotropy which may be treated as an $S=1/2$ system with an anisotropic $g$-factor, $g_{xy}=3.02$ and $g_z=1.14$. An orbital dependent exchange interaction is also discussed to explain the temperature dependence of the magnetic susceptibility based on this level scheme.
description: 9 pages, 7 figures, 2 figures in the supplemental material, accepted for publication in Phys. Rev. B
Impact of shocks to economies on the efficiency and robustness of the international pesticide trade networks
Creators: name: Li, Jian-An
name: Wang, Li
name: Xie, Wen-Jie
name: Zhou, Wei-Xing
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Pesticides are important agricultural inputs to increase agricultural productivity and improve food security. The availability of pesticides is partially achieved through international trade. However, economies involved in the international trade of pesticides are impacted by internal and external shocks from time to time, which influence the redistribution efficiency of pesticides all over the world. In this work, we adopt simulations to quantify the efficiency and robustness of the international pesticide trade networks under shocks to economies. Shocks are simulated based on nine node metrics, and three strategies are utilized based on descending, random, and ascending node removal. It is found that the efficiency and robustness of the international trade networks of pesticides increased for all the node metrics except the clustering coefficient. Moreover, the international pesticide trade networks are more fragile when import-oriented economies are affected by shocks.
description: 12 pages, 5 figures