cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Οικονομοτεχνική μελέτη διαστασιολόγησης φωτοβολταϊκών στέγης για διασύνδεση με το ηλεκτρικό δίκτυο
title: Techno-economic study for roof photovoltaic sizing for integration into the power grid
Creators: name: Πασσισης Σπυριδων
Publisher: name: Technical University of Crete
Year: 2018

description: Η παρούσα διπλωματική εργασία πραγματεύεται την εγκατάσταση ενός διασυνδεδεμένου φωτοβολταϊκού συστήματος, ισχύος 10 kWp, με τη μορφή ηλιακής στέγης. Συγκεκριμένα πραγματεύεται τόσο την τεχνική μελέτη που πραγματοποιήθηκε όσο και την οικονομική αξιολόγηση του έργου.
Αρχικά παρουσιάζονται κάποια στοιχεία για τη σύγχρονη τεχνολογία που χρησιμοποιείται σε τέτοιου είδους έργα καθώς και το νομικό πλαίσιο που τα διέπει. Γίνεται επίσης αναφορά στις τάσεις εξέλιξης της αγοράς και του κόστους επένδυσης. Στη συνέχεια γίνεται χρήση του λογισμικού Google Trimble Sketchup για τη σχεδίαση και παρουσίαση της μορφής της ηλιακής αυτή στέγης και περιγράφονται τα στοιχεία που χρησιμοποιήθηκαν για την πραγματοποίηση της μελέτης και της προσομοίωσης. Η τεχνική μελέτη περιλαμβάνει την χωροθέτηση των πλαισίων και τον τρόπο σύνδεσης της ηλιακής στέγης.
Ακολουθεί η οικονομική αξιολόγηση του έργου. Η παραγόμενη ηλεκτρική ενέργεια ενός διασυνδεδεμένου συστήματος πωλείται στον προμηθευτή του δικτύου, επιτρέποντας έτσι στον ιδιοκτήτη της εγκατάστασης να αντιμετωπίζει το έργο ως ένα επενδυτικό σχέδιο. Γίνεται παρουσίαση όλων των παραμέτρων που επηρεάζουν την οικονομική απόδοση του έργου, όπως η συνολική εγκατεστημένη ισχύς, η ετήσια παραγόμενη ηλεκτρική ενέργεια, το ύψος της εγγυημένης τιμής πώλησης, το κόστος κεφαλαίου, το κόστος συντήρησης και ασφάλισης κ.α. Στη συνέχεια υπολογίζονται αναλυτικά οι καθαρές ταμειακές ροές όπως και οι χρηματοοικονομικοί δείκτες της επένδυσης.
Τέλος αναλύονται οι δείκτες Καθαρής Παρούσας Αξίας και Εσωτερικού Βαθμού Απόδοσης και εξάγονται τελικά συμπεράσματα για την ανθεκτικότητα και την οικονομική βιωσιμότητα της επένδυσης.
Primary decomposition of the ideal of polynomials whose fixed divisor is divisible by a prime power
Creators: name: Peruginelli, Giulio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Commutative Algebra (math.AC)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 13B25, 13F20

description: We characterize the fixed divisor of a polynomial $f(X)$ in $\mathbb{Z}[X]$ by looking at the contraction of the powers of the maximal ideals of the overring ${\rm Int}(\mathbb{Z})$ containing $f(X)$. Given a prime $p$ and a positive integer $n$, we also obtain a complete description of the ideal of polynomials in $\mathbb{Z}[X]$ whose fixed divisor is divisible by $p^n$ in terms of its primary components.
description: Fixed typos in (9) and (12)
title: Σχεδιασμός αστικών πάρκων: το μεσογειακό και το ελληνικό τοπίο
Creators: name: Γεωργακακη Γαβριελα
name: Κοτρωτσου Βασιλικη
Publisher: name: Technical University of Crete
Year: 2013

description: Ένα έντονο χαρακτηριστικό του αιώνα, που διανύουμε, είναι η κρίση, είτε αναφερόμαστε στην Ελλάδα, είτε διεθνώς. Η κρίση είναι κυρίως οικονομική, αλλά παράλληλα θα μπορούσε να αναφερθεί κανείς και στην οικολογική κρίση. Οι αλλαγές στη θερμοκρασία, στις εποχές, στο κλίμα και σε ό,τι σχετίζεται με το φυσικό περιβάλλον, του πλανήτη, κάνουν ακόμα πιο έντονη την ανάγκη του ανθρώπου να επαναπροσδιορίσει τη σχέση του με τη φύση.
Το τεχνητό περιβάλλον κυριαρχεί, εκεί όπου το δομημένο δεν έχει αφήσει περιθώρια για την ύπαρξη φυσικών στοιχείων και η σχέση ανθρώπου – φύση έχει ξεχαστεί. Παρόμοιο μοτίβο συναντάμε στις πόλεις. Είναι γεγονός ότι τα μεγάλα κέντρα των πόλεων ανά τον κόσμο έχουν κορεστεί από την πυκνή δόμηση και τον πληθυσμό, που κατοικεί σε αυτές. Στον ελλαδικό χώρο συναντάμε συχνά, κέντρα πόλεων με πολύ πυκνό δομημένο χώρο και ελάχιστους πράσινους χώρους. Παρατηρώντας ακόμα και μία μικρή πόλη, της επαρχίας, θα διαπιστώσουμε ότι ο δομημένος χώρος εξαπλώνεται, με τα χρόνια προς όλες τις κατευθύνσεις άναρχα, χωρίς να προβλέπονται χώροι πρασίνου.
Αναφέροντας τον όρο «χώροι πρασίνου» για μία πόλη, θέλουμε να δώσουμε τον προσδιορισμό ενός χώρου, όπου ο κάτοικος της πόλης θα μπορέσει να αναπληρώσει τη «χαμένη σχέση» του με τη φύση. Ένας χώρος ενταγμένος μέσα στην πόλη, που θα δίνει την ευκαιρία στον κάτοικο να συναναστραφεί με άλλους ανθρώπους και να αισθανθεί γύρω του τη φύση, όπως τη συναντά στην εξοχή. Τέτοιοι χώροι σε μία πόλη είναι τα αστικά πάρκα. Μέρη ενός αστικού ιστού που αξιοποιούνται για να παρέχουν στον κάτοικο δραστηριότητες, πράσινο χωρίς όμως να τον αποκόβουν από την καθημερινότητά του στην πόλη.
Η έρευνα και η ανάλυση αστικών πάρκων που έχουν υλοποιηθεί, κυρίως στο εξωτερικό, μπορεί να βοηθήσει στη βελτίωση των σχεδιαστικών αρχών των πάρκων, με σκοπό την καλύτερη ποιότητα που μπορεί να προσφέρει ένας τέτοιος δημόσιος χώρος, στον κάτοικο της πόλης.
Thermodynamic behavior of supercritical matter
Creators: name: Bolmatov, Dima
name: Brazhkin, V. V.
name: Trachenko, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Since their discovery in 1822, supercritical fluids have been of enduring interest, and have started to be deployed in many important applications. Theoretical understanding of the supercritical state is lacking, and is seen to limit further industrial deployment. Here, we study thermodynamic properties of the supercritical state, and discover that specific heat shows a crossover between two different regimes, an unexpected result in view of currently perceived homogeneity of supercritical state in terms of physical properties. We subsequently formulate a theory of system thermodynamics above the crossover, and find good agreement between calculated and experimental specific heat with no free fitting parameters. We derive a power law and analyze supercritical scaling exponents in the system above the Frenkel line. In this theory, energy and heat capacity are governed by the minimal length of the longitudinal mode in the system only, and do not explicitly depend on system-specific structure and interactions.
description: to be published in Nature Communications
Das Journal des Harry Graf Kessler. Kommentierte Ausgabe ausgewählter Eintragungen der Tagebücher in französischer Sprache / Le Journal du comte Harry Kessler. Édition partielle, traduite et commentée
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2016

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2014/2015
title: Εκδοχές μοντερνισμού στο αρχιτεκτονικό, εικαστικό και διδακτικό έργο του Τάκη Μάρθα (1905-1965)
title: Versions of modernism in the architectural, visual and educational work of Takis Marthas (1905-1965)
Creators: name: Μαρθα Λουκια
Publisher: name: Technical University of Crete
Year: 2019

description: Ο Τάκης Μάρθας (1905-1965)  συνδυάζει στο πρόσωπό του τον ρόλο του αρχιτέκτονα, ζωγράφου και καθηγητή στην Αρχιτεκτονική σχολή του Εθνικου Μετσοβιου Πολυτεχνείου. Προσωπικότητα πολύπλευρη, έχει συμβάλει στην συγκρότηση της αρχιτεκτονικής του μεσοπολέμου στην Ελλάδα. Θεωρείται ένας απο τους πρωτοπόρους στην εικαστική αφαίρεση ενω η συνεισφορά του στην αρχιτεκτονική εκπαίδευση είναι αδιαμφισβήτητη. Παρά ταύτα το Αρχιτεκτονικό και το συνολικό του έργο δεν έχει μελετηθεί.
Η διατριβή πραγματεύεται  το έργο του μέσα από τη διερεύνηση της σχέσης ανάμεσα στους δυο τομείς, την αρχιτεκτονική και τις εικαστικές τέχνες, και τον αντίκτυπο που είχαν στο αρχιτεκτονικό έργο αλλά και στη διδασκαλία του.
Το  ερευνητικό υλικό της διατριβής προέκυψε από εκτεταμένη πρωτογενή έρευνα  με κορμό το αρχείο του αρχιτέκτονα μαζί με  λεπτομερή  καταγραφή και ανάλυση του αρχιτεκτονικού, διδακτικού και ζωγραφικού έργου του. Το αρχιτεκτονικό έργο του περιλαμβάνει: κτήρια κατοικιών και δημόσια κτήρια ενώ από το σύνολο του ζωγραφικού – εικαστικού  έργου μελετάται το τμήμα εκείνο που έχει σχέση με την αρχιτεκτονική.
Στόχοι της διατριβής είναι:
α) η συνεισφορά στην ελληνική αρχιτεκτονική ιστοριογραφία της μονογραφίας ενός αρχιτέκτονα της γενιάς του μεσοπολέμου η οποία θα περιλαμβάνει το σύνολο των  μέχρι τώρα ευρημάτων για τον αρχιτέκτονα και το έργο του και μια προσπάθεια ερμηνείας του.
Β) η συμβολή στην κατανόηση και την ερμηνεία της πορείας που ακολούθησε η αρχιτεκτονική κατά τον 20ό αιώνα  στην Ελλάδα και η τοποθέτηση του δημιουργού στο πλαίσιο της ελληνικής και διεθνούς αρχιτεκτονικής σκηνής.
γ) η διερεύνηση της σχέσης αρχιτεκτονικής και εικαστικών τεχνών, υπό το πρίσμα του μοντέρνου και της παράδοσης, έτσι όπως εκφράζεται στο έργο του Τάκη Μάρθα, αρχιτέκτονα του οποίου το έργο κατεξοχήν προσφέρεται για τον σκοπό αυτό.
δ) η συνεισφορά του Τάκη Μάρθα στο όραμα της γενιάς του 30, δηλαδή στον εξελληνισμό του μοντέρνου.
Τα  χαρακτηριστικά της περίπτωσης του Μάρθα με κυριότερο τη συνύπαρξη στο πρόσωπό του τριών ιδιοτήτων – του αρχιτέκτονα, του  ζωγράφου  και του καθηγητή  καθιστούν τη μελέτη του έργου του εξαιρετικά ενδιαφέρουσα τόσο σε επίπεδο πρωτογενούς έρευνας όσο και μεθοδολογικής προσέγγισης και ερμηνεία.
Veranstaltungen und Projekte im Rahmen des Jahresthemas / Manifestations et projets dans le cadre du sujet annuel
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
title: Χιονοδρομικό Κέντρο στην περιοχή του Τροόδους
title: Troodos Ski Resort
Creators: name: Γεωργιου Στεφανια
Publisher: name: Technical University of Crete
Year: 2019

description: Το σκι αποτελεί ένα άθλημα που αλληλεπιδρά ο άνθρωπος με την φύση, αποτελεί ευχάριστη αλλά ταυτόχρονα και εξαιρετική άσκηση για το σώμα. Λόγω των καιρικών συνθηκών της Κύπρου, συνήθως η χειμερινή περίοδος είναι πολύ σύντομη, έτσι δημιουργήθηκαν δυο ειδών πίστες: 1) πίστες φυσικού χιονιού που λειτουργούν εποχιακά 2) πίστες τεχνητού χιονιού που λειτουργούν όλο το χρόνο, αλλά την περίοδο όπου είναι χιονισμένα λειτουργούν ενιαία με τις φυσικές διαδρομές. Το χιονοδρομικό κέντρο ενισχύεται με την κατασκευή καταλυμάτων και κέντρου ευεξίας. Το βασικό εργαλείο σχεδιασμού βασίζεται στην ενσωμάτωση του κέντρου στο βουνό και την φύση με κάθε κομμάτι του να έχει απεριόριστη θέα προς το βουνό. Σκοπός είναι η ανάδειξη του ως ένα νέο αναγνωρίσιμο στοιχείο της περιοχής του Τροόδους και κατ’ επέκταση της Κύπρου.
Phonon-induced dynamic resonance energy transfer
Creators: name: Lim, James
name: Tame, Mark
name: Yee, Ki Hyuk
name: Lee, Joong-Sung
name: Lee, Jinhyoung
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In a network of interacting quantum systems achieving fast coherent energy transfer is a challenging task. While quantum systems are susceptible to a wide range of environmental factors, in many physical settings their interactions with quantized vibrations, or phonons, of a supporting structure are the most prevalent. This leads to noise and decoherence in the network, ultimately impacting the energy-transfer process. In this work, we introduce a novel type of coherent energy-transfer mechanism for quantum systems, where phonon interactions are able to actually enhance the energy transfer. Here, a shared phonon interacts with the systems and dynamically adjusts their resonances, providing remarkable directionality combined with quantum speed- up. We call this mechanism phonon-induced dynamic resonance energy transfer and show that it enables long-range coherent energy transport even in highly disordered systems.
DistHD: A Learner-Aware Dynamic Encoding Method for Hyperdimensional Classification
Creators: name: Wang, Junyao
name: Huang, Sitao
name: Imani, Mohsen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Brain-inspired hyperdimensional computing (HDC) has been recently considered a promising learning approach for resource-constrained devices. However, existing approaches use static encoders that are never updated during the learning process. Consequently, it requires a very high dimensionality to achieve adequate accuracy, severely lowering the encoding and training efficiency. In this paper, we propose DistHD, a novel dynamic encoding technique for HDC adaptive learning that effectively identifies and regenerates dimensions that mislead the classification and compromise the learning quality. Our proposed algorithm DistHD successfully accelerates the learning process and achieves the desired accuracy with considerably lower dimensionality.
Automorphism Groups of Hyperbolic Lattices
Creators: name: Mertens, Michael H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: Based on the concept of dual cones introduced by J.Opgenorth we give an algorithm to compute a generating system of the group of automorphisms of a lattice endowed with a hyperbolic bilinear form.
description: Changes mainly in sections 2 and 4, added 6 figures. 23 pages Submitted to Journal of Algebra (Computational Section)
Preparation, Physical and Electrochemical Characterization of Nickel Cobaltites, NixCo3-xO4 (0 ≤ x ≤ 2.5): A Recent Study
Creators: name: Makhtar Guène
Publisher: name: Zenodo
Year: 2021
Subjects: Mixed oxides
Spinel
Pechini
XRD
SEM
Cyclic voltammetry
roughness factor

description: Mixed oxides of spinel type NixCo3-xO4 with 0 ≤ x ≤ 2.5 have been synthesized via several methods. We used X-ray diffraction, the Brunauer-Emmett-Teller process, and scanning electron microscopy to investigate their physicochemical properties. Cyclic voltammetry, steady state measurements, and roughness factor were used to investigate their electrocatalytic performances. The oxides crystallise in a cubic spinel phase with a unit lattice parameter that increases with x and is a feature of the preparation process, according to the X-ray diffraction patterns. The double layer capacitance, which was measured using cyclic voltammograms, was used to estimate the electrochemical surface area of the powders. Pechini synthesis produces oxides with a greater surface area, higher electrical conductivity, and roughness electrochemical activity. The findings show that catalytic properties are essentially related to real surface area.
On an approach for computing the generating functions of the characters of simple Lie algebras
Creators: name: Núñez, J. Fernández
name: Fuertes, W. García
name: Perelomov, A. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 17B10, 17B80, 81R12

description: We describe a general approach to obtain the generating functions of the characters of simple Lie algebras which is based on the theory of the quantum trigonometric Calogero-Sutherland model. We show how the method works in practice by means of a few examples involving some low rank classical algebras.
A Practical Entity Linking System for Tables in Scientific Literature
Creators: name: Mulwad, Varish
name: Finin, Tim
name: Kumar, Vijay S.
name: Williams, Jenny Weisenberg
name: Dixit, Sharad
name: Joshi, Anupam
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Entity linking is an important step towards constructing knowledge graphs that facilitate advanced question answering over scientific documents, including the retrieval of relevant information included in tables within these documents. This paper introduces a general-purpose system for linking entities to items in the Wikidata knowledge base. It describes how we adapt this system for linking domain-specific entities, especially for those entities embedded within tables drawn from COVID-19-related scientific literature. We describe the setup of an efficient offline instance of the system that enables our entity-linking approach to be more feasible in practice. As part of a broader approach to infer the semantic meaning of scientific tables, we leverage the structural and semantic characteristics of the tables to improve overall entity linking performance.
title: Η ισχύς και η αδυναμία της αρχιτεκτονικής στο έργο του Rem Koolhaas
title: Power and powerlessness of architecture in the work of Rem Koolhaas
Creators: name: Παλιουρας Νικολαος
Publisher: name: Technical University of Crete
Year: 2019

description: Στην παρούσα εργασία, θα επιχειρήσουμε να ανιχνεύσουμε και να αναπτύξουμε ένα επαναλαμβανόμενο μοτίβο που εμφανίζεται στον λόγο και τα κτίρια του Rem Koolhaas. Ειδικότερα, θα εξετάσουμε τη σκέψη του Rem Koolhaas υπό το δίπολο της ισχύος της απόφασης που επιβάλλεται από τον αρχιτέκτονα και της αδυναμίας υλοποίησης των αποφάσεων αυτών. Το δίπολο αυτό εμφανίζεται ως μοτίβο ακόμα και σε project του που με μια πρώτη ματιά δεν φαίνεται να έχουν κάτι κοινό μεταξύ τους.

Το ερευνητικό ενδιαφέρον της εργασίας έγκειται στην εστίαση και περεταίρω ανάπτυξη σε μία από τις ουκ ολίγες θεωρίες για το έργο του Rem Koolhaas, που αντί να εστιάσει στα μορφολογικά, βιογραφικά ή κοινωνιογραφικά χαρακτηριστικά του, εστιάζει στον ιδεολογικό χαρακτήρα του έργου του και αφορμάται από το ‘’αρχέγονο’’ για τον Koolhaas χαρακτήρα της αρχιτεκτονικής, δηλαδή την αρχιτεκτονική ως η υλοποίηση της απόφασης.

Η εργασία θα κινηθεί σε δύο μεγάλες ενότητες.
Στην πρώτη ενότητα παρουσιάζεται το μάθημα που πήρε ο Koolhaas από το μοντέρνο κίνημα – δηλαδή την ισχύ της αρχιτεκτονικής και τον αντίκτυπο της αρχιτεκτονικής απόφασης. Διακρίνεται δηλαδή μια πρώτη φάση του έργου του Koolhaas που έχοντας ως αφορμή το μοντέρνο κίνημα, παρουσιάζει μια δογματική λύση που προτάσσει την ισχύ της αρχιτεκτονικής ως τη λύση στο παραπάνω ερώτημα - ανταγωνίζεται το μητροπολιτικό χάος μέσω της χρήσης ενός ορίου που ορίζει την τάξη και την αταξία, το ουσιώδες από το ανούσιο - το συνειδητά αιχμάλωτο αλλά ελεύθερο.

Στην δεύτερη ενότητα παρουσιάζεται το αποτέλεσμα του παραπάνω συλλογισμού
δηλαδή την αποτυχία της αρχιτεκτονικής στον σύγχρονο κόσμο να εκπληρώσει τις
ουτοπίες που είχε υποσχεθεί επαναπροσδιορίζοντας αναπόφευκτα την ταυτότητα της. Στην ήττα αυτή ο Koolhaas προτάσσει την αποδοχή της αδυναμίας της αρχιτεκτονικής ως τη δύναμη της και την αποδοχή αντί του ανταγωνισμού του μητροπολιτικού χάους και των απρόβλεπτων καταστάσεων που αυτό συνεπάγεται τόσο στην κλίμακα της πόλης όσο και στην κλίμακα των κτιρίων.

Το θεωρητικό υπόβαθρο της εργασίας είναι τα κείμενα των θεωρητικών της
αρχιτεκτονικής Jeff Kipnis, Zaera Polo, Robert Somol και Sarah Whiting, το βιβλίο της Ingrid Bock-Six Canonical Projects καθώς και η εργοβιογραφία του Rem Koolhaas.
title: Ανάπλαση μέσω σημειακών επεμβάσεων του χωριού Μολυβδοσκεπάστου Ιωαννίνων
title: Reformation through point intervantions of the village Molyvdoskepastos of Ioannina
Creators: name: Μπρατσος Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2019

description: Το χωριό Μολυβδοσκέπαστο βρίσκεται στο νομό των Ιωαννίνων, στα σύνορα με την Αλβανία Η συγκεκριμένη διπλωματική περιλαμβάνει το σχεδιασμό ενός ξενοδοχείου-εστιατορίου, ενός λαογραφικού μουσείου και μίας κατοικίας μαζί με μαγαζί. Τα δύο πρώτα κτίρια έχουν ως στόχο την τόνωση του τουρισμού και την πολιτιστική ανάδειξη του χωριού. Το τρίτο αποτελεί ένα μοντέλο κατοικίας μαζί με τον χώρο εργασίας, το οποίο συνηθιζόταν και παλαιότερα. Επίσης, τα κτίρια θα καλύψουν ορισμένα σημαντικά κενά που έχουν δημιουργηθεί στον ιστό του χωριού, εξαιτίας των καταστροφών από το Β’ Παγκόσμιο Πόλεμο και της ερημοποίησης μετά το 1950.
Nonommutative wormholes in $f(R)$ gravity
Creators: name: Jamil, Mubasher
name: Rahaman, Farook
name: Myrzakulov, Ratbay
name: Kuhfittig, P. K. F.
name: Ahmed, Nasr
name: Mondal, Umar F
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper discusses several new exact solutions of static wormholes in $f(R)$ gravity with a noncommutative-geometry background, which replaces point-like structures by smeared objects. In the first part of the paper we assume the power-law form $f(R)=aR^n$ and discuss several solutions corresponding to different values of the exponent. The second part of the paper assumes a particular form of the shape function that also yields a viable solution. This investigation generalizes some of our previous work in $f(R)$ gravity, as well as in noncommutative geometry.
description: 9 pages, 17 figures, Accepted for publication in the Journal of Korean Physical Society (Proceedings of 13th Italian-Korean Symposium on Relativistic Astrophysics)
Hamiltonian Thermostats Fail to Promote Heat Flow
Creators: name: Hoover, Wm. G.
name: Hoover, Carol G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Hamiltonian mechanics can be used to constrain temperature simultaneously with energy. We illustrate the interesting situations that develop when two different temperatures are imposed within a composite Hamiltonian system. The model systems we treat are "phi-4" chains, with quartic tethers and quadratic nearest-neighbor Hooke's-law interactions. This model is known to satisfy Fourier's law. Our prototypical problem sandwiches a Newtonian subsystem between hot and cold Hamiltonian reservoir regions. We have characterized four different Hamiltonian reservoir types. There is no tendency for any of these two-temperature Hamiltonian simulations to transfer heat from the hot to the cold degrees of freedom. Evidently steady heat flow simulations require energy sources and sinks, and are therefore incompatible with Hamiltonian mechanics.
description: 17 pages with four figures ; see also the many arXiv contributions mentioned in the references. Published in Communications in Nonlinear Science and Numerical Simulation 18, 3365-3372(2013); (received and accepted 10 May 2013, available online 17 May 2013)
The Arf-Kervaire invariant of framed manifolds as an obstruction to embeddability
Creators: name: Akhmetiev, Peter M.
name: Cencelj, Matija
name: Repovš, Dušan D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Topology (math.AT)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 55Q10, 55Q45, 55P42, 57N35, 57Q35, 58D10

description: We prove that no $14$-connected (resp. $30$-connected) stably parallelizable manifold $N^{30}$ (resp. $N^{62}$) of dimension $30$ (resp. $62$) with the Arf-Kervaire invariant 1 can be smoothly embedded into $\mathbb{R}^{36}$ (resp. $\mathbb{R}^{83}$).
Analysis of biosurfactants produced by bacteria growing on textile sludge and their toxicity evaluation for environmental application
Creators: name: Singh, Ratan
name: Singh, Sanjeev Kumar
name: Rathore, Dheeraj
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Inorganic Chemistry
subject: Plant Biology

description: In the present study two promising bacterial strains were isolated from textile sludge and studied for biosurfactant production. These strains were identified as Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437. Growth, biosurfactant production and stable emulsification of both bacteria were optimized through response surface methodology using a Box-Behnken design (BBD). The optimum conditions included a pH of 8.5, a temperature of 42 °C and a NaCl concentration of 5 mg 100 mL−1. The biosurfactants produced by Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437 were purified and characterized by TLC, FTIR, SEM-EDS and GC-MS. The functional biosurfactant molecules were identified as glycolipid (Palmitic acid-Ribo-Gala-Malt) and lipopeptide (Steric acid-Ala-Ala-Gly-Leu-Se-Pro-As) from Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437, respectively. Both of the biosurfactansts have excellent surface tension reduction abilities at lower critical micelle concentrations (CMCs). Purified biosurfactants also exhibited antimicrobial activity toward pathogenic microbes while they were found to be nontoxic in seed germination tests. The results indicate that the biosurfactants from Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437 have unique properties including excessive foam-forming, antimicrobial activity and a lack of toxicity, which facilitate their environmental use.
From Classical To Quantum Gravity: Introduction to Loop Quantum Gravity
Creators: name: Giesel, Kristina
name: Sahlmann, Hanno
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present an introduction to the canonical quantization of gravity performed in loop quantum gravity, based on lectures held at the 3rd quantum geometry and quantum gravity school in Zakopane in 2011. A special feature of this introduction is the inclusion of new proposals for coupling matter to gravity that can be used to deparametrize the theory, thus making its dynamics more tractable. The classical and quantum aspects of these new proposals are explained alongside the standard quantization of vacuum general relativity in loop quantum gravity.
description: 56 pages. Contribution to the Proceedings of the 3rd Quantum Geometry and Quantum Gravity School in Zakopane (2011). v2: Typos corrected, various small changes in presentation, version as published in PoS
Interplay of disorder and geometrical frustration in doped Gadolinium Gallium Garnet
Creators: name: Woo, N.
name: Silevitch, D. M.
name: Ferri, C.
name: Ghosh, S.
name: Rosenbaum, T. F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The geometrically-frustrated, triangular antiferromagnet GGG exhibits a rich mix of short-range order and isolated quantum states. We investigate the effects of up to 1% Neodymium substitution for Gallium on the ac magnetic response at temperatures below 1 K in both the linear and nonlinear regimes. Substitutional disorder actually drives the system towards a more perfectly frustrated state, apparently compensating for the effect of imperfect Gadolinium/Gallium stoichiometry, while at the same time more closely demarcating the boundaries of isolated, coherent clusters composed of hundreds of spins. Optical measurements of the local Nd environment substantiate the picture of an increased frustration index with doping.
description: 5 pages, 5 figures
On Silicon Group Elements Ejected by Supernovae Type Ia
Creators: name: De, Soma
name: Timmes, F. X.
name: Athanassiadou, Themis
name: Chamulak, David A.
name: Hawley, Wendy
name: Jack, Dennis
name: Brown, Edward F.
name: Calder, Alan C.
name: Townsley, Dean M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: There is compelling evidence that the peak brightness of a Type Ia supernova is affected by the electron fraction Ye at the time of the explosion. The electron fraction is set by the aboriginal composition of the white dwarf and the reactions that occur during the pre explosive convective burning. To date, determining the makeup of the white dwarf progenitor has relied on indirect proxies, such as the average metallicity of the host stellar population. In this paper, we present analytical calculations supporting the idea that the electron fraction of the progenitor systematically influences the nucleosynthesis of silicon group ejecta in Type Ia supernovae. In particular, we suggest the abundances generated in quasi nuclear statistical equilibrium are preserved during the subsequent freezeout. This allows one to potential recovery of Ye at explosion from the abundances recovered from an observed spectra. We show that measurement of 28Si, 32S, 40Ca, and 54Fe abundances can be used to construct Ye in the silicon rich regions of the supernovae. If these four abundances are determined exactly, they are sufficient to recover Ye to 6 percent. This is because these isotopes dominate the composition of silicon-rich material and iron rich material in quasi nuclear statistical equilibrium. Analytical analysis shows that the 28Si abundance is insensitive to Ye, the 32S abundance has a nearly linear trend with Ye, and the 40Ca abundance has a nearly quadratic trend with Ye. We verify these trends with post-processing of 1D models and show that these trends are reflected in model synthetic spectra.
description: Submitted to the ApJ
Neighborhood-based Hard Negative Mining for Sequential Recommendation
Creators: name: Fan, Lu
name: Pu, Jiashu
name: Zhang, Rongsheng
name: Wu, Xiao-Ming
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Negative sampling plays a crucial role in training successful sequential recommendation models. Instead of merely employing random negative sample selection, numerous strategies have been proposed to mine informative negative samples to enhance training and performance. However, few of these approaches utilize structural information. In this work, we observe that as training progresses, the distributions of node-pair similarities in different groups with varying degrees of neighborhood overlap change significantly, suggesting that item pairs in distinct groups may possess different negative relationships. Motivated by this observation, we propose a Graph-based Negative sampling approach based on Neighborhood Overlap (GNNO) to exploit structural information hidden in user behaviors for negative mining. GNNO first constructs a global weighted item transition graph using training sequences. Subsequently, it mines hard negative samples based on the degree of overlap with the target item on the graph. Furthermore, GNNO employs curriculum learning to control the hardness of negative samples, progressing from easy to difficult. Extensive experiments on three Amazon benchmarks demonstrate GNNO's effectiveness in consistently enhancing the performance of various state-of-the-art models and surpassing existing negative sampling strategies. The code will be released at \url{https://github.com/floatSDSDS/GNNO}.
Electrically tunable two-channel Kondo fixed points in helical liquids
Creators: name: Lee, Yu-Li
name: Lee, Yu-Wen
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a quantum dot coupled to two edge states of a quantum spin Hall insulator through electron tunnelings in the presence of a Rashba spin-orbital interaction induced by an external electric field. We show that if the electron interactions on the edge states are repulsive, there are two possible phases, depending on the Luttinger liquid parameter $K$. For $1/2
description: 6 pages, 1 figure
Geräuschkulissen. Fünf Anmerkungen zur akustischen Dimension des Designs
Creators: name: Ihden-Rothkirch, Silke
Publisher: name: Neuwerk - Zeitschrift für Designwissenschaft
Year: 2017

description: -
description: Neuwerk - Zeitschrift für Designwissenschaft, Bd. 4 (2014): Stille
Analysis of biosurfactants produced by bacteria growing on textile sludge and their toxicity evaluation for environmental application
Creators: name: Singh, Ratan
name: Kumar Singh, Sanjeev
name: Rathore, Dheeraj
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Inorganic Chemistry
subject: Plant Biology

description: In the present study two promising bacterial strains were isolated from textile sludge and studied for biosurfactant production. These strains were identified as Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437. Growth, biosurfactant production and stable emulsification of both bacteria were optimized through response surface methodology using a Box-Behnken design (BBD). The optimum conditions included a pH of 8.5, a temperature of 42 °C and a NaCl concentration of 5 mg 100 mL−1. The biosurfactants produced by Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437 were purified and characterized by TLC, FTIR, SEM-EDS and GC-MS. The functional biosurfactant molecules were identified as glycolipid (Palmitic acid-Ribo-Gala-Malt) and lipopeptide (Steric acid-Ala-Ala-Gly-Leu-Se-Pro-As) from Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437, respectively. Both of the biosurfactansts have excellent surface tension reduction abilities at lower critical micelle concentrations (CMCs). Purified biosurfactants also exhibited antimicrobial activity toward pathogenic microbes while they were found to be nontoxic in seed germination tests. The results indicate that the biosurfactants from Stenotrophomonas sp. BAB-6435 and Brevisbacillus brevis BAB-6437 have unique properties including excessive foam-forming, antimicrobial activity and a lack of toxicity, which facilitate their environmental use.
First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
Creators: name: The Event Horizon Telescope Collaboration
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A$^*$), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength of $λ=1.3\,{\rm mm}$. The EHT data resolve a compact emission region with intrahour variability. A variety of imaging and modeling analyses all support an image that is dominated by a bright, thick ring with a diameter of $51.8 \pm 2.3$\,\uas (68\% credible interval). The ring has modest azimuthal brightness asymmetry and a comparatively dim interior. Using a large suite of numerical simulations, we demonstrate that the EHT images of Sgr A$^*$ are consistent with the expected appearance of a Kerr black hole with mass ${\sim}4 \times 10^6\,{\rm M}_\odot$, which is inferred to exist at this location based on previous infrared observations of individual stellar orbits as well as maser proper motion studies. Our model comparisons disfavor scenarios where the black hole is viewed at high inclination ($i > 50^\circ$), as well as non-spinning black holes and those with retrograde accretion disks. Our results provide direct evidence for the presence of a supermassive black hole at the center of the Milky Way galaxy, and for the first time we connect the predictions from dynamical measurements of stellar orbits on scales of $10^3-10^5$ gravitational radii to event horizon-scale images and variability. Furthermore, a comparison with the EHT results for the supermassive black hole M87$^*$ shows consistency with the predictions of general relativity spanning over three orders of magnitude in central mass.
description: 24 pages, 6 figures, published in The Astrophysical Journal Letters on May 12, 2022. See the published paper for the full authors list
The black widow pulsar J1641+8049 in the optical, radio and X-rays
Creators: name: Kirichenko, A. Yu.
name: Zharikov, S. V.
name: Karpova, A. V.
name: Fonseca, E.
name: Zyuzin, D. A.
name: Shibanov, Yu. A.
name: López, E. A.
name: Gilfanov, M. R.
name: Cabrera-Lavers, A.
name: Geier, S.
name: Dong, F. A.
name: Good, D. C.
name: McKee, J. W.
name: Meyers, B. W.
name: Stairs, I. H.
name: McLaughlin, M. A.
name: Swiggum, J. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: PSR J1641+8049 is a 2 ms black widow pulsar with the 2.2 h orbital period detected in the radio and $γ$-rays. We performed new phase-resolved multi-band photometry of PSR J1641+8049 using the OSIRIS instrument at the Gran Telescopio Canarias. The obtained data were analysed together with the new radio-timing observations from the Canadian Hydrogen Intensity Mapping Experiment (CHIME), the X-ray data from the Spectrum-RG/eROSITA all-sky survey, and all available optical photometric observations. An updated timing solution based on CHIME data is presented, which accounts for secular and periodic modulations in pulse dispersion. The system parameters obtained through the light curve analysis, including the distance to the source 4.6-4.8 kpc and the orbital inclination 56-59 deg, are found to be consistent with previous studies. However, the optical flux of the source at the maximum brightness phase faded by a factor of $\sim$2 as compared to previous observations. Nevertheless, the face of the J1641+8049 companion remains one of the most heated (8000-9500 K) by a pulsar among the known black widow pulsars. We also report a new estimation on the pulsar proper motion of $\approx$2 mas yr$^{-1}$, which yields a spin down luminosity of $\approx$4.87$\times 10^{34}$ ergs s$^{-1}$ and a corresponding heating efficiency of the companion by the pulsar of 0.3-0.7. The pulsar was not detected in X-rays implying its X-ray-luminosity was <3 $\times$ 10$^{31}$ erg s$^{-1}$ at the date of observations.
description: Accepted for publication in MNRAS
Unprecedented reduction and quick recovery of the South Indian Ocean heat content and sea level in 2014–2018
Creators: name: Volkov, Denis L.
name: Lee, Sang-Ki
name: Gordon, Arnold L.
name: Rudko, Michael
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Oceanography
subject: FOS: Earth and related environmental sciences
subject: Ocean temperature
subject: Sea level
subject: Ocean circulation

description: Following the onset of the strong 2014–2016 El Niño, a decade-long increase of the basin-wide sea level and heat content in the subtropical southern Indian Ocean (SIO) in 2004–2013 ended with an unprecedented drop, which quickly recovered during the weak 2017–2018 La Niña. Here, we show that the 2014–2016 El Niño contributed to the observed cooling through an unusual combination of both the reduced heat advection from the Pacific (dominant in the eastern SIO) and the basin-wide cyclonic wind anomaly that led to shoaling of isotherms (dominant in the western SIO). The ensuing recovery was mainly forced by an anticyclonic wind anomaly associated with stronger trade winds that caused deepening of isotherms and upper-ocean warming, effectively suppressing the 2014–2016 cooling signal propagating from the eastern boundary. The results presented here highlight the complexity of the SIO heat content variability driven by remote and local forcing.
Evaluation of expected solar flare neutrino events in the IceCube observatory
Creators: name: de Wasseige, G.
name: Evenson, P.
name: Hanson, K.
name: van Eijndhoven, N.
name: Klein, K. -L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Since the end of the eighties and in response to a reported increase in the total neutrino flux in the Homestake experiment in coincidence with a solar flare, solar neutrino detectors have searched for solar flare signals. Neutrinos from the decay of mesons, which are themselves produced in collisions of accelerated protons with the solar atmosphere, would provide a novel window on the underlying physics of the acceleration process. For our studies we focus on the IceCube Neutrino Observatory, a cubic kilometer neutrino detector located at the geographical South Pole. Due to its Supernova data acquisition system and its DeepCore component, dedicated to low energy neutrinos, IceCube may be sensitive to solar flare neutrinos and thus permit either a measurement of the signal or the establishment of more stringent upper limits on the solar flare neutrino flux. We present an approach for a time profile analysis based on a stacking method and an evaluation of a possible solar flare signal in IceCube using the Geant4 toolkit.
description: Paper submitted to the 34th International Cosmic Ray Conference, The Hague 2015
Asymptotic Analysis for Optimal Dividends in a Dual Risk Model
Creators: name: Fahim, Arash
name: Zhu, Lingjiong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Risk Management (q-fin.RM)
subject: Portfolio Management (q-fin.PM)
subject: FOS: Economics and business

description: The dual risk model is a popular model in finance and insurance, which is often used to model the wealth process of a venture capital or high tech company. Optimal dividends have been extensively studied in the literature for a dual risk model. It is well known that the value function of this optimal control problem does not yield closed-form solutions except in some special cases. In this paper, we study the asymptotics of the optimal dividend problem when the parameters of the model go to either zero or infinity. Our results provide insights to the optimal strategies and the optimal values when the parameters are extreme.
description: 31 pages
On Finite-Index Indexed Grammars and Their Restrictions
Creators: name: D'Alessandro, Flavio
name: Ibarra, Oscar H.
name: McQuillan, Ian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences
subject: 68Q45

description: The family, L(INDLIN), of languages generated by linear indexed grammars has been studied in the literature. It is known that the Parikh image of every language in L(INDLIN) is semi-linear. However, there are bounded semi linear languages that are not in L(INDLIN). Here, we look at larger families of (restricted) indexed languages and study their properties, their relationships, and their decidability properties.
description: 16 pages, latest version
Quisling
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019
Subjects: Presidents--Assassination
Politics and government
Coups d'état

description: A speech by Caldwell Taylor (the Grenadian UN representative) about the polical assassination of Maurice Bishop (the Prime Minister of Grenada) in which he expresses disproval of the anyone supporting Bernard Coard or the new government. This is likely the speech by Taylor on October 28, 1983. He continues to speak about General Hudson Austin and the U.S. invasion of Grenada (which he also disapproves of)
Sympathetic Nervous System and Atherosclerosis
Creators: name: Wang, Yutang
name: Anesi, Jack
name: Maier, Michelle C
name: Myers, Mark A
name: Oqueli, Ernesto
name: Sobey, Christopher
name: Drummond, Grant
name: Denton, Kate M
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 3107
subject: Microbiology
subject: FOS: Biological sciences
classificationCode: 3101
subject: Biochemistry and cell biology
classificationCode: 3404
subject: Medicinal and biomolecular chemistry

description: Atherosclerosis is characterized by the narrowing of the arterial lumen due to subendothelial lipid accumulation, with hypercholesterolemia being a major risk factor. Despite the recent advances in effective lipid-lowering therapies, atherosclerosis remains the leading cause of mortality globally, highlighting the need for additional therapeutic strategies. Accumulating evidence suggests that the sympathetic nervous system plays an important role in atherosclerosis. In this article, we reviewed the sympathetic innervation in the vasculature, norepinephrine synthesis and metabolism, sympathetic activity measurement, and common signaling pathways of sympathetic activation. The focus of this paper was to review the effectiveness of pharmacological antagonists or agonists of adrenoceptors (α1, α2, β1, β2, and β3) and renal denervation on atherosclerosis. All five types of adrenoceptors are present in arterial blood vessels. α1 blockers inhibit atherosclerosis but increase the risk of heart failure while α2 agonism may protect against atherosclerosis and newer generations of β blockers and β3 agonists are promising therapies against atherosclerosis; however, new randomized controlled trials are warranted to investigate the effectiveness of these therapies in atherosclerosis inhibition and cardiovascular risk reduction in the future. The role of renal denervation in atherosclerosis inhibition in humans is yet to be established.
Distances and Isomorphism between Networks: Stability and Convergence of Network Invariants
Creators: name: Chowdhury, Samir
name: Mémoli, Facundo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Metric Geometry (math.MG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 68T09, 55N31, 54E35

description: We develop the theoretical foundations of a generalized Gromov-Hausdorff distance between functions on networks that has recently been applied to various subfields of topological data analysis and optimal transport. These functional representations of networks, or networks for short, specialize in the finite setting to (possibly asymmetric) adjacency matrices and derived representations such as distance or kernel matrices. Existing literature utilizing these constructions cannot, however, benefit from continuous formulations because the continuum limits of finite networks under this distance are not well-understood. For example, while there are currently numerous persistent homology methods on finite networks, it is unclear if these methods produce well-defined persistence diagrams in the infinite setting. We resolve this situation by introducing the collection of compact networks that arises by taking continuum limits of finite networks and developing sampling results showing that this collection admits well-defined persistence diagrams. Compared to metric spaces, the isomorphism class of the generalized Gromov-Hausdorff distance over networks is rather complex, and contains representatives having different cardinalities and different topologies. We provide an exact characterization of a suitable notion of isomorphism for compact networks as well as alternative, stronger characterizations under additional topological regularity assumptions. Toward data applications, we describe a unified framework for developing quantitatively stable network invariants, provide basic examples, and cast existing results on the stability of persistent homology methods in this extended framework. To illustrate our theoretical results, we introduce a model of directed circles with finite reversibility and characterize their Dowker persistence diagrams.
description: This work is a merger of arXiv:1708.04727, arXiv:1804.02820, and arXiv:1711.04211. It has now been published in the Journal of Applied and Computational Topology