cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Σχεδιασμός και ανάπτυξη συστήματος ενημέρωσης θέσεως στάθμευσης ΑΜΕΑ, ενεργειακά αυτόνομου και χαμηλού κόστους
title: Design and development of a parking lot warning system for people with special needs, with autonomous power and low cost
Creators: name: Ρεκουμης Δημητριος
Publisher: name: Technical University of Crete
Year: 2018

description: Η παρούσα μελέτη έχει στόχο την βελτίωση της ποιότητας διαβίωσης των ΑμεΑ με την συμβολή της τεχνολογίας. Για τις ανάγκες της εργασίας, κατασκευάστηκε ένα σύστημα ελέγχου της προσωπικής θέσης στάθμευσης του εκάστοτε ΑμεΑ. Η έγκυρη ενημέρωση για την κατάσταση της θέσης γίνεται μέσω εφαρμογής στις συσκευές κινητής τηλεφωνίας, ώστε, τα εμποδιζόμενα άτομα και οι οικογένειές τους να μπορούν να σταθμεύουν χωρίς παρεμπόδιση. Το ενεργειακά αυτόνομο σύστημα, δίνει την δυνατότητα παραμετροποίησης ,ανεξαρτήτως του χώρου εγκατάστασης, σε απλά βήματα μέσω της εφαρμογής.
The SL(2,R) totally constrained model: three quantization approaches
Creators: name: Gambini, Rodolfo
name: Olmedo, Javier
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We provide a detailed comparison of the different approaches available for the quantization of a totally constrained system with a constraint algebra generating the non-compact $SL(2,\mathbb{R})$ group. In particular, we consider three schemes: the Refined Algebraic Quantization, the Master Constraint Programme and the Uniform Discretizations approach. For the latter, we provide a quantum description where we identify semiclassical sectors of the kinematical Hilbert space. We study the quantum dynamics of the system in order to show that it is compatible with the classical continuum evolution. Among these quantization approaches, the Uniform Discretizations provides the simpler description in agreement with the classical theory of this particular model, and it is expected to give new insights about the quantum dynamics of more realistic totally constrained models such as canonical general relativity.
description: 40 pages, revised version
Finite-Length Scaling of Polar Codes
Creators: name: Hassani, S. Hamed
name: Alishahi, Kasra
name: Urbanke, Rudiger
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Consider a binary-input memoryless output-symmetric channel $W$. Such a channel has a capacity, call it $I(W)$, and for any $R0$, then the required block-length $N$ scales in terms of the rate $R < I(W)$ as $N \geq \fracα{(I(W)-R)^{\underlineμ}}$, where $α$ is a positive constant that depends on $P_{\rm e}$ and $I(W)$, and $\underlineμ = 3.579$. Also, we show that with the same requirement on the sum of Bhattacharyya parameters, the block-length scales in terms of the rate like $N \leq \fracβ{(I(W)-R)^{\overlineμ}}$, where $β$ is a constant that depends on $P_{\rm e}$ and $I(W)$, and $\overlineμ=6$.
description: In IEEE Transactions on Information Theory, 2014
Lattice simulations of adjoint QCD with one Dirac overlap fermion
Creators: name: Bergner, Georg
name: Lopez, Juan Camilo
name: Piemonte, Stefano
name: Calero, Ivan Soler
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this work we investigate the infrared behaviour of a Yang-Mills theory coupled to a massless fermion in the adjoint representation of the gauge group SU(2). This model has many interesting properties, corresponding to the $\mathcal{N}=2$ Super-Yang-Mills theory without scalars and in the recent years there has been an increasing interest toward understanding whether confinement and fermion condensation occur at low energy. We simulate the theory on the lattice close to the massless limit using the overlap discretization of the fermion action, allowing a precise and clean study of the chiral symmetry breaking pattern and of the fermion condensate. We present results for the scale setting, the condensate and the running of the coupling constant through the gradient flow -- all of them pointing to a theory without an infrared fixed point and remaining confined deep in the infrared regime.
description: 10 pages, 9 figures
Language Learning in Repeated Storytellings
Creators: name: Frantz, Kelly Katherine
Publisher: name: Columbia University
Year: 2019
Subjects: Applied linguistics
Conversation analysis
Conversational repair
Second language acquisition
English language--Study and teaching--Foreign speakers

description: This paper uses conversation analysis (CA) to trace changes in one learner’s repair practices during a repetitive storytelling activity in an intermediate-level ESL classroom. An analysis of the learner’s phonological and grammatical repairs is guided by two questions: How are the repair sequences organized, and what changes occur in the sequences over time? By considering the impact of task repetition on a student’s linguistic performance, this study highlights CA’s analytical potential for examining learning processes during classroom activities on a highly detailed level. The findings contribute to the larger sociocultural reconceptualization of second language acquisition by demonstrating how learning occurs and is made visible during a student’s interaction with her teacher and peers.
HiPrompt: Few-Shot Biomedical Knowledge Fusion via Hierarchy-Oriented Prompting
Creators: name: Lu, Jiaying
name: Shen, Jiaming
name: Xiong, Bo
name: Ma, Wenjing
name: Staab, Steffen
name: Yang, Carl
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Medical decision-making processes can be enhanced by comprehensive biomedical knowledge bases, which require fusing knowledge graphs constructed from different sources via a uniform index system. The index system often organizes biomedical terms in a hierarchy to provide the aligned entities with fine-grained granularity. To address the challenge of scarce supervision in the biomedical knowledge fusion (BKF) task, researchers have proposed various unsupervised methods. However, these methods heavily rely on ad-hoc lexical and structural matching algorithms, which fail to capture the rich semantics conveyed by biomedical entities and terms. Recently, neural embedding models have proved effective in semantic-rich tasks, but they rely on sufficient labeled data to be adequately trained. To bridge the gap between the scarce-labeled BKF and neural embedding models, we propose HiPrompt, a supervision-efficient knowledge fusion framework that elicits the few-shot reasoning ability of large language models through hierarchy-oriented prompts. Empirical results on the collected KG-Hi-BKF benchmark datasets demonstrate the effectiveness of HiPrompt.
Giant vacuum forces via transmission lines
Creators: name: Shahmoon, Ephraim
name: Mazets, Igor
name: Kurizki, Gershon
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum electromagnetic fluctuations induce forces between neutral particles, known as the van der Waals (vdW) and Casimir interactions. These fundamental forces, mediated by virtual photons from the vacuum, play an important role in basic physics and chemistry, and in emerging technologies involving, e.g. micro-electromechanical systems or quantum information processing. Here we show that these interactions can be enhanced by many orders of magnitude upon changing the character of the mediating vacuum-modes. By considering two polarizable particles in the vicinity of any standard electric transmission line, along which photons can propagate in one dimension (1d), we find a much stronger and longer-range interaction than in free-space. This enhancement may have profound implications on many-particle and bulk systems, and impact the quantum technologies mentioned above. The predicted giant vacuum force is estimated to be measurable in a coplanar waveguide line.
description: 3 figures
Cross-Examining English-Medium Legal Education
Creators: name: Dundon, John Terry
Publisher: name: Columbia University
Year: 2019
Subjects: Language policy
Language and education
Law--Study and teaching
Applied linguistics
English language

description: Increasingly, English is being used as a medium of instruction in law schools around the world, even in countries that do not use English in their legal systems. This paper examines three related research questions about this phenomenon. First, it explores why these law schools are choosing to deliver law degrees in English, notwithstanding the discrepancy between the language of instruction and the languages in which local laws are written. Next, it assesses how English is actually being used in law school classrooms, and what other institutional changes appear to be occurring at the same time. Finally, it examines what, if anything, can be said about the effect that English-medium instruction may be having on student content achievement. Many elements of these research questions appear to be unanswered by research in either applied linguistics or legal education, and directions for future empirical research are therefore suggested.
Wirkungen neolithischer Wirtschaftsweisen in Pollendiagrammen
Creators: name: Kalis, Arie J.
name: Meurers-Balke, Jutta
Publisher: name: DGUF e.V.
Year: 2017

description: [nicht vorhanden / not available]
description: Archäologische Informationen, Bd. 11, Nr. 1 (1988): Archäologische Informationen
title: Spolia στη σύγχρονη αρχιτεκτονική: θραύσμα, μνήμη, τόπος
title: Spolia in contemporary architecture: fragment, memory, place
Creators: name: Ανδρεαδης Αντωνιος
name: Μπρουντζος Ιασων
Publisher: name: Technical University of Crete
Year: 2019

description: Η παρούσα εργασία επιχειρεί να μελετήσει τη χρήση spolia, δηλαδή την επανάχρηση αρχιτεκτονικών μελών από κατεδαφισμένους χώρους, ως προς τη σύνδεσή της με τις έννοιες του τόπου και της μνήμης στη σύγχρονη αρχιτεκτονική.
Ως προς την επίτευξη αυτού του σκοπού διερευνάται και συγκρίνεται το έργο δύο αρχιτεκτόνων που συνδέουν τη χρήση των spolia με την ανάκτηση του τόπου και την ανάκληση της συλλογικής μνήμης. Οι αρχιτέκτονες είναι ο Δημήτρης Πικιώνης της Ελλάδας του 70 και ο Wang Shu στη σύγχρονη παγκοσμιοποιημένη Κίνα. Εκτός αυτού, σημαντικός άξονας μελέτης αποτέλεσε το κοινωνικό και οικονομικό πλαίσιο που σε κάθε περίπτωση οδήγησε στη χρήση των spolia, καθώς και η απάντηση που μπορεί να δώσει η επανάχρηση ως προς το ευρύτερο παγκόσμιο γίγνεσθαι της σύγχρονης εποχής που προκαλεί ομογενοποίηση της αρχιτεκτονικής και υπέρμετρη σπατάλη πόρων και αγαθών.
Reentrant Phase Behavior in Active Colloids with Attraction
Creators: name: Redner, Gabriel S.
name: Baskaran, Aparna
name: Hagan, Michael F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Motivated by recent experiments, we study a system of self-propelled colloids that experience short-range attractive interactions and are confined to a surface. Using simulations we find that the phase behavior for such a system is reentrant as a function of activity: phase-separated states exist in both the low- and high-activity regimes, with a homogeneous active fluid in between. To understand the physical origins of reentrance, we develop a kinetic model for the system's steady-state dynamics whose solution captures the main features of the phase behavior. We also describe the varied kinetics of phase separation, which range from the familiar nucleation and growth of clusters to the complex coarsening of active particle gels.
description: 5 pages, 5 figures
Right or Wrong?: The Classroom as a Site of Compliance
Creators: name: Sanford, Kate
Publisher: name: Columbia University
Year: 2019
Subjects: English language--Study and teaching--Foreign speakers
Student teachers
Immigrant students
Classroom environment--Psychological aspects
Compliance

description: English language learners, and particularly recent immigrants, must negotiate not only the academic demands of American schooling, but also the social and cultural demands. In this vingette drawn from student teaching experience, the author shows how the classroom is often a site shaped by the dichotomy of right/wrong, in which students are constantly assessing the degree to which they have complied with expectations and in which there is often no space left for questions that seek answers outside of that dichotomy.
Rational curves, Dynkin diagrams and Fano manifolds with nef tangent bundle
Creators: name: Muñoz, Roberto
name: Occhetta, Gianluca
name: Conde, Luis Eduardo Solá
name: Watanabe, Kiwamu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary 14M15, Secondary 14E30, 14J45

description: A Fano manifold $X$ with nef tangent bundle is of flag-type if it has the same type of elementary contractions as a complete flag manifold. In this paper we present a method to associate a Dynkin diagram $\mathcal{D}(X)$ with any such $X$, based on the numerical properties of its contractions. We then show that $\mathcal{D}(X)$ is the Dynkin diagram of a semisimple Lie group. As an application we prove that Campana-Peternell conjecture holds when $X$ is a flag-type manifold whose Dynkin diagram is $A_n$ ($X$ is shown to be the complete flag in $\mathbb{P}^n$).
Educators Who Change Our Lives Forever
Creators: name: Murphy, Katharine
Publisher: name: Columbia University
Year: 2019
Subjects: Student teachers
Racial discrimination in education
Chinese American students
English language--Study and teaching--Foreign speakers
First person narrative

description: We were in a 5th grade classroom, working on a unit about narrative writing. Students had just completed personal narratives in which they depicted a challenging moment in their lives. The narratives were surprisingly frank and vulnerable. One student wrote about watching his baby sister being taken to China; another wrote about her dog’s death. These 11-year olds were writing about the most difficult and harrowing experiences of their young lives. I was moved, nearly to tears.
title: Downsized dwelling, το κίνημα των μικροκατοικιών στον 21ο αιώνα
title: Downsized dwelling, tin houses in the 21st century
Creators: name: Μανωλεσακη Χριστινα
Publisher: name: Technical University of Crete
Year: 2019

description: Η παρούσα ερευνητική εργασία πραγματεύεται το φαινόμενο της μικρό-κατοίκισης στην σημερινή εποχή. Εστιάζει στους τύπους της μικρής κατοικίας, πως δομούνται και πως επιλύ- ονται από αρχιτέκτονες σε διαφορετικά μέρη του κόσμου.
Ως Downsized dwelling ορίζεται το όριο που μπορεί να σμικρυνθεί ο χώρος κατοίκισης, με βάση ψυχολογικά, πολιτιστικά και ιδεολογικά χαρακτηριστικά.
Αφορμή του θέματος αυτού είναι η συνεχόμενη αύξηση του πληθυσμού με αποτέλεσμα την αυξανόμενη ζήτηση των κατοίκων για στέγαση, ειδικά στα μεγάλα αστικά κέντρα.
Ζώντας σε μία εποχή που υπάρχει οικονομική κρίση, προσφυγικές ροές, κλιματική αλλαγή και έλλειψη χώρου στις πόλεις, η αναζήτηση για το ελάχιστο φαίνεται η λύση του μέλλοντος. Όλο και περισσότεροι αρχιτέκτονες αναλαμβάνουν έργα μικρής κλίμακας όπως pavilions, popups, installations, και άλλα με εξαιρετικό ενδιαφέρον.
Όταν σχεδιάζεις στην ελάσσονα κλίμακα γίνεται πλήρης μελέτη μέχρι και την κατασκευαστική λεπτομέρεια. Η εξέλιξη της τεχνολογίας βοηθάει αυτή τη τάση, καθώς νέα συστήματα χρησι- μοποιούνται για τον σχεδιασμό και υλοποίηση αυτών, δίνοντας τη δυνατότητα στους αρχιτέκτο- νες για άμεση επέμβαση.
Το περιβαλλοντικό αποτύπωμα απασχολεί τον κόσμο, θέλοντας μικρότερους χώρους, με οι- κολογικά υλικά, ανακυκλωμένα και λιγότερη ενέργεια για τη διατήρηση τους.
Επίσης παρατηρείται ένα κίνημα (tiny house movement) που θέλει τους ανθρώπους να προτι- μούν να ζουν σε μικρά αλλά φωτεινά και πρακτικά σπίτια, απαλλαγμένα από περιττούς χώρους, ακολουθώντας την ιδέα “less is more”.
Dyson-Schwinger approach to color superconductivity at finite temperature and density
Creators: name: Müller, Daniel
name: Buballa, Michael
name: Wambach, Jochen
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the phases of dense QCD matter at finite temperature with Dyson-Schwinger equations for the quark propagator for N_f=2+1 flavors. For the gluon propagator we take a fit to quenched lattice data and add quark-loop effects perturbatively in a hard-thermal-loop--hard-dense-loop approximation. We consider 2SC and CFL-like pairing with chiral up and down quarks and massive strange quarks and present results for the condensates and the phase diagram. We find a dominant CFL phase at chemical potentials larger than 500-600 MeV. At lower values of the chemical potential we find a 2SC phase, which also exists in a small band at higher temperatures for larger chemical potentials. With values of 20-30 MeV, the critical temperatures to the normal phase turn out to be quite small.
description: 14 pages, 9 figures; v2: Fixed compatibility problems with latest evince version (Feynman diagrams not visible); v3: Discussion of chiral condensate added, discussion of strange quark mass changed, section VI. added, accepted version
Unveiling the charge distribution of a GaAs-based nanoelectronic device: A large experimental data-set approach
Creators: name: Chatzikyriakou, Eleni
name: Wang, Junliang
name: Mazzella, Lucas
name: Lacerda-Santos, Antonio
name: Figueira, Maria Cecilia da Silva
name: Trellakis, Alex
name: Birner, Stefan
name: Grange, Thomas
name: Bäuerle, Christopher
name: Waintal, Xavier
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In quantum nanoelectronics, numerical simulations have become an ubiquitous tool. Yet the comparison with experiments is often done at a qualitative level or restricted to a single device with a handful of fitting parameters. In this work, we assess the predictive power of these simulations by comparing the results of a single model with a large experimental data set of 110 devices with 48 different geometries. The devices are quantum point contacts of various shapes and sizes made with electrostatic gates deposited on top of a high mobility GaAs/GaAlAs two dimensional electron gas. We study the pinch-off voltages applied on the gates to deplete the two-dimensional electron gas in various spatial positions. We argue that the pinch-off voltages are a very robust signature of the charge distribution in the device. The large experimental data set allows us to critically review the modeling and arrive at a robust one-parameter model that can be calibrated in situ, a crucial step for making predictive simulations.
description: 33 pages, 16 figures, journal submission, corrected author name typo, added references, corrected visibility of appendix table, to appear in Physical Review Research
Lisa Harbatkin
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Presidents--Election
Real estate development

description: This Land is Your Land" by Woody Guthrie plays. "The One on the Right is On the Left" by Johnny Cash plays. "Lord Have Mercy" by John D. Loudermilk plays. "Workin' Man Blues" by Merle Haggard plays. The radio show that plays is "Mainstream Left" by Lisa Harbadken (?). She discusses the 1972 Presidential Election and various NYC housing development projects
Infinite Variance in Monte Carlo Sampling of Lattice Field Theories
Creators: name: Yunus, Cagin
name: Detmold, William
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In Monte Carlo calculations of expectation values in lattice quantum field theories, the stochastic variance of the sampling procedure that is used defines the precision of the calculation for a fixed number of samples. If the variance of an estimator of a particular quantity is formally infinite, or in practice very large compared to the square of the mean, then that quantity can not be reliably estimated using the given sampling procedure. There are multiple scenarios in which this occurs, including in Lattice Quantum Chromodynamics, and a particularly simple example is given by the Gross-Neveu model where Monte Carlo calculations involve the introduction of auxiliary bosonic variables through a Hubbard-Stratonovich (HS) transformation. Here, it is shown that the variances of HS estimators for classes of operators involving fermion fields are divergent in this model and an even simpler zero-dimensional analogue. To correctly estimate these observables, two alternative sampling methods are proposed and numerically investigated.
description: 21 pages, 12 figures, 2 tables
The fractured Moon: Production and saturation of porosity in the lunar highlands from impact cratering
Creators: name: Soderblom, Jason M.
name: Evans, Alexander J.
name: Johnson, Brandon C.
name: Melosh, H. Jay
name: Miljković, Katarina
name: Phillips, Roger J.
name: Andrews-Hanna, Jeffrey C.
name: Bierson, Carver J.
name: Head, James W.
name: Milbury, Colleen
name: Neumann, Gregory A.
name: Nimmo, Francis
name: Smith, David E.
name: Solomon, Sean C.
name: Sori, Michael M.
name: Wieczorek, Mark A.
name: Zuber, Maria T.
Publisher: name: Columbia University
Year: 2015
Subjects: Lunar geology
Lunar craters
Satellites--Surfaces

description: We have analyzed the Bouguer anomaly (BA) of ~1200 complex craters in the lunar highlands from Gravity Recovery and Interior Laboratory observations. The BA of these craters is generally negative, though positive BA values are observed, particularly for smaller craters. Crater BA values scale inversely with crater diameter, quantifying how larger impacts produce more extensive fracturing and dilatant bulking. The Bouguer anomaly of craters larger than urn:x-wiley:00948276:media:grl53324:grl53324-math-0001 km in diameter is independent of crater size, indicating that there is a limiting depth to impact‐generated porosity, presumably from pore collapse associated with either overburden pressure or viscous flow. Impact‐generated porosity of the bulk lunar crust is likely in a state of equilibrium for craters smaller than ~30 km in diameter, consistent with an ~8 km thick lunar megaregolith, whereas the gravity signature of larger craters is still preserved and provides new insight into the cratering record of even the oldest lunar surfaces.
The Variety Generated by A(T) -- Two Counterexamples
Creators: name: Moore, Matthew
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We show that V(A(T)) does not have definable principal subcongruences or bounded Maltsev depth. When the Turing machine T halts, V(A(T)) is an example of a finitely generated semilattice based (and hence congruence meet-semidistributive) variety with only finitely many subdirectly irreducible members, all finite. This is the only known example of a variety with these properties that does not have definable principal subcongruences or bounded Maltsev depth.
Detecting extra-galactic supernova neutrinos in the Antarctic ice
Creators: name: Böser, Sebastian
name: Kowalski, Marek
name: Schulte, Lukas
name: Strotjohann, Nora Linn
name: Voge, Markus
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Building on the technological success of the IceCube neutrino telescope, we outline a prospective low-energy extension that utilizes the clear ice of the South Pole. Aiming at a 10 Mton effective volume and a 10 MeV threshold, the detector would provide sufficient sensitivity to detect neutrino bursts from core-collapse supernovae (SNe) in nearby galaxies. The detector geometry and required density of instrumentation are discussed along with the requirements to control the various sources of background, such as solar neutrinos. In particular, the suppression of spallation events induced by atmospheric muons poses a challenge that will need to be addressed. Assuming this background can be controlled, we find that the resulting detector will be able to detect SNe from beyond 10 Mpc, delivering between 10 and 41 regular core-collapse SN detections per decade. It would further allow to study more speculative phenomena, such as optically dark (failed) SNe, where the collapse proceeds directly to a black hole, at a detection rate similar to that of regular SNe. We find that the biggest technological challenge lies in the required number of large area photo-sensors, with simultaneous strict limits on the allowed noise rates. If both can be realized, the detector concept we present will reach the required sensitivity with a comparatively small construction effort and hence offers a route to future routine observations of SNe with neutrinos.
description: revised to include full treatment of diffusive ice, conclusion unchanged
High precision simulations of weak lensing effect on Cosmic Microwave Background polarization
Creators: name: Fabbian, Giulio
name: Stompor, Radek
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study accuracy, robustness and self-consistency of pixel-domain simulations of the gravitational lensing effect on the primordial CMB anisotropies due to the large-scale structure of the Universe. In particular, we investigate dependence of the results precision on some crucial parameters of such techniques and propose a semi-analytic framework to determine their values so the required precision is a priori assured and the numerical workload simultaneously optimized. Our focus is on the B-mode signal but we discuss also other CMB observables, such as total intensity, T, and E-mode polarization, emphasizing differences and similarities between all these cases. Our semi-analytic considerations are backed up by extensive numerical results. Those are obtained using a code, nicknamed lenS2HAT -- for Lensing using Scalable Spherical Harmonic Transforms (S2HAT) -- which we have developed in the course of this work. The code implements a version of the pixel-domain approach of Lewis (2005) and permits performing the simulations at very high resolutions and data volumes, thanks to its efficient parallelization provided by the S2HAT library -- a parallel library for a calculation of the spherical harmonic transforms. The code is made publicly available.
description: 20 pages, 14 figures, submitted to A&A, matches version accepted for publication in A&A
title: Αναλημματικά τοιχία "μνήμης"
Αποκατάσταση και επανάχρηση Ενετικής έπαυλις στο χωριό Ροδωπού
title: Retaining “memory” walls. Restoration and adaptive reuse of Venetian villa at Rodopou village
Creators: name: Πενταρη Ευαγγελια
Publisher: name: Technical University of Crete
Year: 2019

description: Η παρούσα διπλωματική εργασία ταλαντεύεται ανάμεσα σε ανάγκες του παρόντος μέσα από «μνήμες» του παρελθόντος. Πραγματεύεται αφενός τη νέα χρήση που δίδεται στη βίλα, ως ένα δημόσιο Κέντρο Πληροφόρησης και αφενός την αποκατάσταση τόσο αυτής, όσο και του χαρακτήρα του τοπίου της Κρητικής υπαίθρου. Πρόκειται για ενετική βίλα, 16ου αιώνα που βρίσκεται στο χωριό Ροδωπού. Θέτοντας λοιπόν ως στόχο τη διάσωση, την ανθεκτικότητα και την ανάδειξη της μνήμης της, προτείνω ένα τρόπο ιστορικής αποκατάστασης του κτιρίου, κατόπιν ενδελεχούς μελέτης των ιστορικών οικοδομικών φάσεων της και της μορφολογικής της εξέλιξης. Γίνεται ένα πέρασμα από το παλιό στο νέο μέσα από μια σχεδιαστική δομή που αποτελείται τόσο από αυτή του Κέντρου Πληροφόρησης όσο και από τα νέα εργαστήρια που προστίθενται που απευθύνονται σε ασχολίες των ενετών, με σκοπό την αναβίωση αυτών των χρόνων. Εξαιτίας του ενδιαφέροντος που παρουσιάζουν οι υψομετρικές της βίλας και του αύλιου χώρου αυτής καθώς έχουν μια αμφιθεατρική μορφή, ο βασικός σχεδιαστικός στόχος αποσκοπεί στο γεγονός ότι η νέα επέμβαση οφείλει να σέβεται τόσο την παλιά κατάσταση και να εντάσσεται αρμονικά σε αυτήν όσο και στο περιβάλλον που συνδιαλέγεται. Τέσσερα πέτρινα τοιχία, κάθετα και γραμμικά, εκ των οποίων τα δύο είναι αναλημματικά θα ορίσουν το κτιριακό κέλυφος, θα θέσουν τα όρια του μέσα με του έξω και θα ιεραρχήσουν τις κινήσεις του πιθανού επισκέπτη. Η πιθανή πορεία αυτού δεν περιορίζεται μόνο στη βίλα και τον αύλιο χώρο αυτής αλλά ενισχύεται από την ύπαρξη της πλατείας, μιας σκληρής επιφάνειας που βρίσκεται απέναντι από τη βίλα, με σκοπό να παραλάβει δυναμικά τον επισκέπτη και να τον ωθήσει προς αυτή. Απώτερος σκοπός λοιπόν, είναι μέσω των σχεδιαστικών αποφάσεων που έχουν παρθεί και τη δημιουργία ενός δημόσιου Κέντρου, να αποτελέσει ένα πόλο έλξης ως σύστημα κινήσεων, πορειών και ενημέρωσης τόσο για τους ντόπιους του χωριού όσο και για τους επισκέπτες ή τουρίστες που επιθυμούν να βιώσουν την εμπειρία.
On dB spaces with nondensely defined multiplication operator and the existence of zero-free functions
Creators: name: Silva, Luis O.
name: Toloza, Julio H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: Primary 46E22, Secondary 47A25, 47B25, 47N99

description: In this work we consider de Branges spaces where the multiplication operator by the independent variable is not densely defined. First, we study the canonical selfadjoint extensions of the multiplication operator as a family of rank-one perturbations from the viewpoint of the theory of de Branges spaces. Then, on the basis of the obtained results, we provide new necessary and sufficient conditions for a real, zero-free function to lie in a de Branges space.
description: 13 pages, no fugures. Theorem and remark have been added, typographical erros corrected
Gravitational wave constraints on the shape of neutron stars
Creators: name: Johnson-McDaniel, Nathan K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that there is a direct relation between upper limits on (or potential future measurements of) the m = 2 quadrupole moments of slowly rotating neutron stars and the l = m = 2 deformation of the star's surface, in full general relativity, to first order in the perturbation. This relation only depends on the star's structure through its mass and radius. All one has to assume about the star's constituents is that the stress-energy tensor at its surface is that of a perfect fluid, which will be true with good accuracy in almost all the situations of interest, and that the magnetic field configuration there is force-free, which is likely to be a good approximation. We then apply this relation to the stars which have direct LIGO/Virgo bounds on their m = 2 quadrupole moment, below the spin-down limit, and compare with the expected surface deformations due to rotation. In particular, we find that LIGO observations have constrained the Crab pulsar's l = m = 2 surface deformation to be smaller than its l = 2, m = 0 deformation due to rotation, for all the causal equations of state we consider, a statement that would not have been able to be made just using the upper bounds on the l = m = 2 deformation from electromagnetic observations.
description: 13 pages, 3 figures, version accepted by PRD, including expanded discussion of the calculation and a few corrections
An $L^p$ theory for stationary radiative transfer
Creators: name: Egger, Herbert
name: Schlottbom, Matthias
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We present a self-contained analysis of the stationary radiative transfer equation in weighted $L^p$ spaces. The use of weighted spaces allows us to derive uniform a-priori estimates for $1 \le p \le \infty$ under minimal assumptions on the parameters. By constructing an explicit example, we show that our estimates are sharp and cannot be improved in general. Better estimates are however derived under additional assumptions on the parameters. We also present estimates for derivatives and traces of the solution and formulate a natural energy space, for which the data-to-solution map becomes an isomorphism. As a side result, we are able to prove uniform convergence of the source iteration for all $1 \le p \le \infty$ without the assumption of positive absorption that is frequently used in the literature.
KubeEdge-Sedna v0.3: Towards Next-Generation Automatically Customized AI Engineering Scheme
Creators: name: Zheng, Zimu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.11
subject: 00

description: The scale of the global edge AI market continues to grow. The current technical challenges that hinder the large-scale replication of edge AI are mainly small samples on the edge and heterogeneity of edge data. In addition, edge AI customers often have requirements for data security compliance and offline autonomy of edge AI services. Based on the lifelong learning method in the academic world, we formally define the problem of edge-cloud collaborative lifelong learning for the first time, and release the industry's first open-source edge-cloud collaborative lifelong learning. Edge-cloud collaborative lifelong learning adapts to data heterogeneity at different edge locations through (1) multi-task transfer learning to achieve accurate prediction of "thousands of people and thousands of faces"; (2) incremental processing of unknown tasks, the more systems learn and the smarter systems are with small samples, gradually realize AI engineering and automation; (3) Use the cloud-side knowledge base to remember new situational knowledge to avoid catastrophic forgetting; (4) The edge-cloud collaborative architecture enables data security compliance and edge AI services to be offline autonomy while applying cloud resources. This work hopes to help fundamentally solve the above-mentioned challenges of edge-cloud collaborative machine learning.
description: Content in Chinese. Publised on FEB 2022, in Automation Panorama, Special Issue on Edge Computing, vol. 39., no. 344., pp. 72-75
Fundamental domains for properly discontinuous affine groups
Creators: name: Smilga, Ilia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20G20 (Primary) 22E40, 20H15 (Secondary)

description: We construct a fundamental region for the action on the $2d+1$-dimensional affine space of some free, discrete, properly discontinuous groups of affine transformations preserving a quadratic form of signature $(d+1, d)$, where $d$ is any odd positive integer.
description: This is the version published in Geometriae Dedicata. It incorporates the corrections suggested by the reviewer. Most of these are minor, except for one: I replaced the term 'Lagrangian' (which, given the context, was not quite proper) by 'MTIS' (short for 'maximal totally isotropic subspace')
Classical ground states of spin lattices
Creators: name: Schmidt, Heinz-Jürgen
name: Richter, Johannes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a generalization of the Luttinger-Tisza-Lyons-Kaplan (LTLK) theory of classical ground states of Bravais lattices with Heisenberg coupling to non-Bravais lattices. It consists of adding certain Lagrange parameters to the diagonal of the Fourier transformed coupling matrix analogous to the theory of the general ground state problem already published. This approach is illustrated by an application to a modified honeycomb lattice, which has exclusive three-dimensional ground states as well as a classical spin-liquid ground state for different values of the two coupling constants. Another example, the modified square lattice, shows that we can also obtain so-called incommensurable ground states by our method.
description: With respect to the 1st version we have formulated a new Proposition 2 and partially corrected one example. With respect to the 2nd version we have added some explanations and a further reference
title: Το παιχνίδι ως μέθοδος συμμετοχικού σχεδιασμού για την επίτευξη της βιωσιμότητας των πόλεων
title: Serious games as a collaborative tool to reach sustainability in the city
Creators: name: Μπουρτζινακου Παναγιωτα
Publisher: name: Technical University of Crete
Year: 2019

description: Η κρίση που διανύουμε τα τελευταία χρόνια στους τομείς της οικονομίας, της κοινωνίας και ιδιαίτερα του περιβάλλοντος, οδήγησε στην αναθεώρηση παγιωμένων θέσεων, καθώς και την ανάληψη δράσεων από πολίτες, ευαισθητοποιημένους φορείς και κυβερνήσεις, με σκοπό τη βιώσιμη ανάπτυξη. Η άμεση σχέση της αστικής ανάπτυξης με την βιωσιμότητα της πόλης γίνεται γρήγορα σαφής. Οπότε κρίνεται αναγκαίος ο εμπλουτισμός του πολεοδομικού σχεδιασμού με καινοτόμες και εναλλακτικές λύσεις. Ιδιαίτερη έμφαση δόθηκε στη συμμετοχή όλων των πληθυσμιακών ομάδων που επηρεάζονται από τις εκάστοτε αποφάσεις, στις διαδικασίες σχεδιασμού. Υπήρξε πλήθος θεωριών για την επίτευξη της βιώσιμης ανάπτυξης παγκοσμίως, όμως ελάχιστα έγιναν πράξη, έτσι το αστικό παιχνίδι κλήθηκε να γεφυρώσει αυτό το χάσμα.
Το παιχνίδι γεννάται μαζί με την εμφάνιση του ανθρώπινου είδους και εξελίσσεται συνεχώς μέχρι σήμερα. Χρησιμοποιήθηκε επίσημα για εκπαιδευτικούς σκοπούς, ήδη από τις αρχές του 19ου αιώνα στον στρατιωτικό τομέα, ενώ από τις αρχές του 20ου διαδόθηκε στους τομείς των επιχειρήσεων και της πολιτικής. Οι ολοένα αυξανόμενες προκλήσεις του 21ου αιώνα οδήγησαν στην ανάγκη εύρεσης νέων λύσεων, όπως η δημιουργία των αστικών παιχνιδιών. Οι ευκαιρίες για επικοινωνία,  κινητοποίηση, ενημέρωση, ομαδική εργασία, διαπραγματεύσεις χωρίς ρίσκο, καθώς και για πειραματισμό με σκοπό την εύρεση κατάλληλης στρατηγικής, καθιστούν το παιχνίδι σημαντικό παράγοντα στον αστικό και πολεοδομικό σχεδιασμό. Επιπλέον η αμφίδρομη ροή πληροφοριών, η από κοινού ανάλυση δεδομένων, η αλληλεπίδραση και ανταλλαγή απόψεων μεταξύ των εμπλεκομένων, αποτελούν στοιχεία που βοηθούν τον σχεδιασμό να ανταποκριθεί στην ολοένα αυξανόμενη πολυπλοκότητα των πόλεων. Καθοριστική είναι ακόμα η συμβολή της τεχνολογίας για την ενσωμάτωση και επεξεργασία του πλήθους των δεδομένων και πληροφοριών.
Ενώ τα αστικά παιχνίδια αποτελούν αντικείμενο έρευνας στα πανεπιστήμια παγκοσμίως ήδη από την δεκαετία του 40΄, ιδιαίτερη έμφαση στη χρησιμοποίηση τους για την επίλυση των ζητημάτων της  βιώσιμης αστικής ανάπτυξης, δίνεται από το 2000 και ύστερα. Στη συγκεκριμένη έρευνα, μελετάμε χαρακτηριστικά παραδείγματα παιχνιδιών της εν λόγω περιόδου, ώστε να εξαγάγουμε συμπεράσματα σχετικά με την χρησιμοποίηση τους για την επίτευξη της βιώσιμης αστικής ανάπτυξης.
Uncertainty Minimization for Personalized Federated Semi-Supervised Learning
Creators: name: Shi, Yanhang
name: Chen, Siguang
name: Zhang, Haijun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Since federated learning (FL) has been introduced as a decentralized learning technique with privacy preservation, statistical heterogeneity of distributed data stays the main obstacle to achieve robust performance and stable convergence in FL applications. Model personalization methods have been studied to overcome this problem. However, existing approaches are mainly under the prerequisite of fully labeled data, which is unrealistic in practice due to the requirement of expertise. The primary issue caused by partial-labeled condition is that, clients with deficient labeled data can suffer from unfair performance gain because they lack adequate insights of local distribution to customize the global model. To tackle this problem, 1) we propose a novel personalized semi-supervised learning paradigm which allows partial-labeled or unlabeled clients to seek labeling assistance from data-related clients (helper agents), thus to enhance their perception of local data; 2) based on this paradigm, we design an uncertainty-based data-relation metric to ensure that selected helpers can provide trustworthy pseudo labels instead of misleading the local training; 3) to mitigate the network overload introduced by helper searching, we further develop a helper selection protocol to achieve efficient communication with acceptable performance sacrifice. Experiments show that our proposed method can obtain superior performance and more stable convergence than other related works with partially labeled data, especially in highly heterogeneous setting.
description: 13 pages, this article has been accepted for publication in IEEE Transactions on Network Science and Engineering
Structure, aggregation dynamics and crystallization of superfolder green fluorescence protein: Effect of long alkyl-chain imidazolium ionic liquids
Creators: name: Han, Qi
name: Darmanin, Connie
name: Rosado, Carlos J
name: Veríssimo, Nathalia Vieira
name: Pereira, Jorge FB
name: Bryant, Gary
name: Drummond, Calum J
name: Greaves, Tamar L
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 340202
subject: Crystallography
classificationCode: 3101
subject: Biochemistry and cell biology

description: Green fluorescent protein (GFP) and its variants are widely used in medical and biological research, especially acting as indicators of protein structural integrity, protein-protein interactions and as biosensors. This study employs superfolder GFP (sfGFP) to investigate the impact of varying alkyl chain length of 1-Cn-3-methylimidazolium chloride ionic liquid (IL) series ([Cnmim]Cl, n = 2, 4, 6, 8, 10, 12) on the protein fluorescence, structure, hydration, aggregation dynamics and crystallization behaviour. The results revealed a concentration-dependent decrease in the sfGFP chromophore, particularly in long alkyl chain ILs ([C10mim]Cl and [C12mim]Cl). Tryptophan (Trp) fluorescence showed the quenching rate increased with longer alkyl chains indicating a nonpolar interaction between Trp57 and the alkyl chain. Secondary structural changes were observed at the high IL concentration of 1.5 M in [C10mim]Cl and [C12mim]Cl. Small-angle X-ray scattering (SAXS) indicated relatively stable protein sizes, but with IL aggregates present in [C10mim]Cl and [C12mim]Cl solutions. Dynamic light scattering (DLS) data showed increased protein size and aggregation with longer alkyl chain ILs. Notably, ILs and salts, excluding [C2mim]Cl, promoted sfGFP crystallization. This study emphasizes the influence of the cation alkyl chain length and concentration on protein stability and aggregation, providing insights into utilizing IL solvents for protein stabilization and crystallization purposes.
title: Μια έμφυλη οπτική για την πόλη: η καθημερινότητα των γυναικών στην Κυψέλη
title: A gender perspective of the city. Women's everyday life in Kypseli
Creators: name: Δριβα---Παπαστεφανακη Αικατερινη---Αλκηστη
Publisher: name: Technical University of Crete
Year: 2019

description: Η πόλη είναι τόπος έκφρασης και συγκρότησης διαφορετικών ταυτοτήτων. Την ίδια στιγμή όμως, έχει ποικίλους τρόπους να απωθεί τις έμφυλες ταυτότητες που αποκλίνουν από τα κυρίαρχα κοινωνικά πρότυπα. Αυτό το φαινόμενο αφορά τις γυναίκες, ιδίως μάλιστα τις μετανάστριες, τις ανύπαντρες μητέρες, τις άνεργες καθώς και άλλες καταπιεζόμενες ή περιθωριακές ομάδες. Στόχος της εργασίας είναι να αναδείξει μια διαφορετική οπτική για την πόλη, αυτή των γυναικών. Η έρευνα εστιάζει στην καθημερινή ζωή των γυναικών στην Κυψέλη και συγκεκριμένα στην ευρύτερη περιοχή της πλατείας Αγίου Γεωργίου. Οι διαφορετικές πρακτικές και δραστηριότητές τους, οι οποίες διαπλέκονται στον αστικό ιστό, υποδεικνύουν διαφορετικούς τρόπους χρήσης και πρόσληψης του δημοσίου χώρου. Εφ’ όσον η χρήση και πρόσληψη του δημοσίου χώρου εξαρτάται από διάφορα χαρακτηριστικά που αφορούν το φύλο, την κοινωνική θέση, την εθνικότητα, την απασχόληση, την ηλικία κ.ο.κ., ένα απαραίτητο μεθοδολογικό εργαλείο για την κατανόηση της ερμηνείας του χώρου αποτέλεσαν οι προφορικές συνεντεύξεις με κάποιες κατοίκους της περιοχής.
Τα κύρια ερωτήματα της έρευνας αφορούν τους τρόπους με τους οποίους μια γυναίκα προσλαμβάνει και  χρησιμοποιεί το δημόσιο χώρο της πόλης. Πως οργανώνεται η καθημερινή ζωή;  Με ποιους τρόπους οι καθημερινές διαδικασίες και διαδρομές οδηγούν σε διαφορετική πρόσληψη και χρήση του δημοσίου χώρου; Ποιοι είναι οι μηχανισμοί περιορισμού/αποκλεισμού των γυναικών από τον αστικό χώρο; Ποια στερεότυπα αντιμετωπίζει μια γυναίκα στη γειτονιά;
Η εργασία συγκροτείται σε τρία μέρη: Το πρώτο μέρος περιλαμβάνει την εισαγωγή, τη μέθοδο και το θεωρητικό πλαίσιο στο οποίο βασίστηκε, δηλαδή θεωρίες για τη σχέση του φύλου και του χώρου. Το δεύτερο μέρος χωρίζεται σε δύο κεφάλαια, εκ των οποίων το ένα εστιάζει στην περιοχή της Κυψέλης και το άλλο περιλαμβάνει την ανάλυση των συνεντεύξεων και την χωρική τους αποτύπωση. Το τρίτο μέρος περιλαμβάνει τα συμπεράσματα και τους προβληματισμούς που προέκυψαν από την έρευνα.
Optimizing Openness in Human Subjects Research: Balancing Transparency and Protection
Creators: name: Kirilova, Dessislava
name: Kapiszewski, Diana
name: Elman, Colin
Publisher: name: Zenodo
Year: 2021

description: Different institutional stakeholders play different roles in guiding the sharing of research data. Funders and publishers/journals, for instance, are both sources and "enforcers" of data management and sharing mandates. Repositories are "transparency facilitators", offering workflows, tools and technologies for data preservation and access. Finally, ethics boards (in the United States, often university-based Institutional Review Boards [IRBs]) are charged with ensuring that researchers comply with regulations and rules designed to protect from harm the human participants they engage in their work. Given that role, some assume that IRBs' natural position is to stand in the way of openness. Our research tests that assumption: we investigate whether and how IRB professionals understand the challenges and opportunities presented by the renewed emphasis on data sharing in the social sciences. Specifically, we undertook a qualitative study of the US-based IRB community, conducting interviews and focus groups with representatives of 30 institutions that receive high levels of funding from the National Science Foundation's Directorate for Social Behavioral and Educational Sciences. Using a structured questionnaire, we asked respondents about the advice they give scholars concerning data sharing; their familiarity with and views on repositories' processes and technology; and their coordination with other campus units on these issues. While many respondents reported awareness of evolution in data-sharing mandates, few had made systematic changes to their policies or procedures to accommodate that evolution. Crucially, however, we found that when approached as partners in supporting robust scholarly research, IRBs are open – in fact eager – to engage with other actors who can provide different expertise. Integrating IRBs into ongoing conversations about sharing social science research data ethically and legally will help IRB professionals to understand, and enable them to encourage researchers to see, how potential conflicts between human participant protection and research transparency can be prevented or mitigated.