cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
An exact static two-mass solution using Nariai spacetime
Creators: name: Fennen, Michael
name: Giulini, Domenico
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 83C15, 83C22, 83F05

description: We show the existence of static, spherically symmetric spacetimes containing two stars of incompressible matter, possibly oppositely charged. The stars are held apart by the negative pressure of a positive cosmological constant but there is no cosmological horizon separating them. The spacetime between the stars is given by the Nariai solution, or a slight generalisation thereof in the charged case.
description: 24 pages, 7 figures
Doped tungsten oxide nanocrystals for next generation electrochromic windows
Creators: name: Heo, Sungyeon
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Tungsten oxide
Electrochromics
Nanocrystals

description: Doped tungsten oxide (WO₃ [subscript -x]) nanocrystals (NCs) have lots of potential for next generation electrochromic windows compared to bulk thin films. The difference lies in intrinsic WO₃ [subscript -x] NC properties of shape and crystalline anisotropy with localized surface plasmon resonance absorption in the shorter wavelength near-infrared range, which can directly affect the major electrochromic performance of switching speed, optical modulation, and cycling stability. This work illustrates how doped WO₃ [subscript -x] NC properties are effectively utilized for enhancing the electrochromic performance. First, how shape anisotropic properties can generate highly porous film is studied using different aspect ratio of WO₂.₇₂ nanorods. By changing the nanorod interaction to electrostatic repulsion from solution ligand-stripping chemistry, highly porous mesoporous thin film from randomly packed nanorods is fabricated. Incorporating guest inorganic materials of niobium polyoxometalate clusters followed by chemical condensation, dual-band modulation of electrochromic films on flexible substrates are demonstrated, tackling cycling stability, and optical modulation issues. Second, how doped semiconductor NCs are effectively used for dynamic Bragg stacks with targeted performance of ‘on and off’ reflectance is studied. Dynamic reflectance tuning can affect the color tuning as well as efficient heat blocking. Judicious NC selection of indium tin oxide and WO₃ [subscript -x] NCs from mechanistic understanding of electrochemical modulation of optical properties, optimization of film processing, and reliable refractive index data from in situ ellipsometry enable accurate Bragg stack optimization from simulation and experimental realization. Third, using monoclinic WO₂.₇₂ nanorods as a model system having different size of three intracrystalline tunnel sites, we study spectroelectrochemical properties with different cation system (lithium, sodium, and tetrabutylammonium ion). In doing so, Al₂O₃ atomic layer deposition is employed to prevent electrolytes degradation and allows to study spectroelectrochemical properties. Na⁺ electrolytes system gives higher coloration efficiency than Li⁺ electrolytes and mainly capacitive charging behavior owing to its occupancy in the hexagonal tunnel sites. The results of these studies suggest general approach to improve electrochromic performance where shape and crystalline anisotropic properties of doped metal oxide nanocrystals can be effectively utilized for impacting spectroelectrochemical properties.
Entwicklung einer Schnittstelle für einen DAE-Solver in der chemischen Verfahrenstechnik
Creators: name: Horn, Dietmar
Publisher: name: Weierstrass Institute
Year: 1996
Subjects: subject: software engineering
subject: interfaces
subject: 68U30
subject: 65C99

description: Bei der Entwicklung numerischer Verfahren zur Lösung großer strukturierter Systeme von Algebro-Differentialgleichungen, die in der chemischen Prozeßsimulation vorkommen, ist eine möglichst automatische Bereitstellung der Beispieldaten notwendig. Dazu wurde eine Schnittstelle definiert, die die notwendigen Informationen enthält. Zur automatischen Schnittstellenerzeugung wurde ein Programm implementiert, das ausgehend von den Protokollen des Prozeßsimulators SPEEDUP diese Schnittstelle erzeugt.
Interaction-free, single-pixel quantum imaging with undetected photons
Creators: name: Yang, Yiquan
name: Liang, Hong
name: Xu, Xiaze
name: Zhang, Lijian
name: Zhu, Shining
name: Ma, Xiao-song
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A typical imaging scenario requires three basic ingredients: 1. a light source that emits light, which in turn interacts and scatters off the object of interest; 2. detection of the light being scattered from the object and 3. a detector with spatial resolution. These indispensable ingredients in typical imaging scenarios may limit their applicability in the imaging of biological or other sensitive specimens due to unavailable photon-starved detection capabilities and inevitable damage induced by interaction. Here, we propose and experimentally realize a quantum imaging protocol that alleviates all three requirements. By embedding a single-photon Michelson interferometer into a nonlinear interferometer based on induced coherence and harnessing single-pixel imaging technique, we demonstrate interaction-free, single-pixel quantum imaging of a structured object with undetected photons. Thereby, we push the capability of quantum imaging to the extreme point in which no interaction is required between object and photons and the detection requirement is greatly reduced. Our work paves the path for applications in characterizing delicate samples with single-pixel imaging at silicon-detectable wavelengths.
Optimal Pointwise Adaptive Methods in Nonparametric Estimation
Creators: name: Lepski, Oleg V.
name: Spokoiny, Vladimir
Publisher: name: Weierstrass Institute
Year: 1996
Subjects: subject: pointwise adaptive estimation
subject: bandwidth selection
subject: Hölder type constraints
subject: 62G07
subject: 62G20

description: The problem of optimal adaptive estimation of a function at a given point from noisy data is considered.Two procedures are proved to be asymptotically optimal for different settings.First we study the problem of bandwidth selection for nonparametric pointwise kernel estimation with a given kernel.We propose a bandwidth selection procedure and prove its optimality in the asymptotic sense. Moreover, this optimality is stated not only among kernel estimators with a variable kernel. The resulting estimator is optimal among all feasible estimators.The important feature of this procedure is that no prior information is used about smoothness properties of the estimated function i.e. the procedure is completely adaptive and "works" for the class of all functions. With it the attainable accuracy of estimation depends on the function itself and it is expressed in terms of "ideal" bandwidth corresponding to this function.The second procedure can be considered as a specification of the first one under the qualitative assumption that the function to be estimated belongs to some Hölder class Σ(β,L) with unknown parameters β, L.This assumption allows to choose a family of kernels in an optimal way and the resulting procedure appears to be asymptotically optimal in the adaptive sense.
On Mini-Batch Training with Varying Length Time Series
Creators: name: Iwana, Brian Kenji
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In real-world time series recognition applications, it is possible to have data with varying length patterns. However, when using artificial neural networks (ANN), it is standard practice to use fixed-sized mini-batches. To do this, time series data with varying lengths are typically normalized so that all the patterns are the same length. Normally, this is done using zero padding or truncation without much consideration. We propose a novel method of normalizing the lengths of the time series in a dataset by exploiting the dynamic matching ability of Dynamic Time Warping (DTW). In this way, the time series lengths in a dataset can be set to a fixed size while maintaining features typical to the dataset. In the experiments, all 11 datasets with varying length time series from the 2018 UCR Time Series Archive are used. We evaluate the proposed method by comparing it with 18 other length normalization methods on a Convolutional Neural Network (CNN), a Long-Short Term Memory network (LSTM), and a Bidirectional LSTM (BLSTM).
description: Accepted to ICASSP 2022
Foundations of Total Functional Data-Flow Programming
Creators: name: Widemann, Baltasar Trancón y
name: Lepper, Markus
Publisher: name: arXiv
Year: 2014
Subjects: subject: Programming Languages (cs.PL)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: D.1.1; D.1.7; D.3.2; D.3.3; F.1.2; F.3.2

description: The field of declarative stream programming (discrete time, clocked synchronous, modular, data-centric) is divided between the data-flow graph paradigm favored by domain experts, and the functional reactive paradigm favored by academics. In this paper, we describe the foundations of a framework for unifying functional and data-flow styles that differs from FRP proper in significant ways: It is based on set theory to match the expectations of domain experts, and the two paradigms are reduced symmetrically to a low-level middle ground, with strongly compositional semantics. The design of the framework is derived from mathematical first principles, in particular coalgebraic coinduction and a standard relational model of stateful computation. The abstract syntax and semantics introduced here constitute the full core of a novel stream programming language.
description: In Proceedings MSFP 2014, arXiv:1406.1534
Building complex networks through classical and Bayesian statistics - a comparison
Creators: name: Thomas, Lina D.
name: Fossaluza, Victor
name: Yambartsev, Anatoly
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: This research is about studying and comparing two different ways of building complex networks. The main goal of our study is to find an effective way to build networks, particularly when we have fewer observations than variables. We construct networks estimating the partial correlation coefficient on Classic Statistics (Inverse Method) and on Bayesian Statistics (Normal - Inverse Wishart conjugate prior). In this current work, in order to solve the problem of having less observations than variables, we propose a new methodology called local partial correlation, which consists of selecting, for each pair of variables, the other variables most correlated to the pair.We applied these methods on simulated data and compared them through ROC curves. The most attractive result is that, even though it has high computational costs, to use Bayesian inference on trees is better when we have less observations than variables. In other cases, both approaches present satisfactory results.
description: 9 pages, 5 figures, conference Brazilian Meeting on Bayesian Statistics 2012
title: Κατακόρυφες τυρβώδεις φλέβες αρνητικής άνωσης σε ήρεμο ομογενή αποδέκτη
titleType: AlternativeTitle
Creators: name: Κόκκαλης, Αθανάσιος Ι.
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΡΕΥΣΤΟΜΗΧΑΝΙΚΗ
subject: ΤΥΡΒΩΔΗΣ ΡΟΗ -- ΜΑΘΗΜΑΤΙΚΑ ΜΟΝΤΕΛΑ

description: Αντικείμενο της παρούσας πειραματικής εργασίας είναι ο προσδιορισμός του βάθους διείσδυσης φλέβας ελαφρύτερου υγρού, το οποίο διαχέεται κατακόρυφα με φορά προς τα κάτω, μέσω ακροφύσιου, σε ομογενές, ακίνητο, βαρύτερο ρευστό. Συγκεκριμένα, μετρήθηκαν το μέγιστο ύψος διείσδυσης φλέβας αρνητικής άνωσης Zmax και το ύψος σταθεροποίησης αυτής Ζ, σαν συνάρτηση του αρχικού αριθμού Richardson της φλέβας. Το εύρος των αρχικών αριθμών Richardson κυμάνθηκε ανάμεσα σε πολύ μικρές τιμές, κοντά στο μηδέν, (φλέβες ορμής ή jets), έως τη μονάδα (πλήρως ανωστικές φλέβες ή πλούμια). Διερευνηθήκαν δύο είδη φλεβών: (1) καθαρό νερό βρύσης που διαχέεται μέσα σε αλατόνερο (φλέβες με σταθερή ανωστική δύναμη) και (2) φλέβα θερμού νερού μέσα σε κρύο νερό βρύσης (φλέβες με μεταβλητή άνωση). Τα στόμια των ακροφυσίων που χρησιμοποιήθηκαν έχουν κυκλική, ορθογωνική, τετραγωνική και τριγωνική διατομή. Ο αποδέκτης, θεωρείται απείρων διαστάσεων (αμελείται η επίδραση των ορίων). Για αρχικούς αριθμούς Richardson της φλέβας μικρότερους από 0.2 έως 0.3, τα κανονικοποιημένα βάθη διείσδυσης κυκλικών φλεβών Ζ//Μ και Zmax//M λαμβάνουν τις τιμές περίπου 2 και 3 αντίστοιχα, αποτελέσματα τα οποία συμφωνούν με τη διαστατική ανάλυση. Επομένως για ακροφύσια κυκλικής διαμέτρου το σταθεροποιημένο βάθος διείσδυσης Ζ είναι πρακτικά ίσο με 2/μ· ενώ Zmax ~ 3/μ· Για μεγαλύτερες τιμές του αρχικού αριθμού Richardson της φλέβας η μείωση των παραπάνω κανονικοποιημένων διεισδείσεων είναι δραματική. Αυτό εξ’ άλλου είναι εμφανές από το γράφημα του κανονικοποιημένου βάθους διείσδυσης Z//q σαν συνάρτηση του αρχικού αριθμού Richardson R0, όπου παρατηρείται αλλαγή της κλίσης της ευθείας των δεδομένων για Ro>0.3, δηλώνοντας την ταχύτερη μείωση του Ζ με την αύξηση του R0. Σε φλέβες με μεγάλη ορμή και αρνητική άνωση από ισόπλευρο τριγωνικό και τετραγωνικό ακροφύσιο, το βάθος διείσδυσης της μόνιμης ροής στο περιβάλλον ρευστό είναι περίπου διπλάσιο της χαρακτηριστικής κλίμακας /μ, ενώ το μέγιστο βάθος διείσδυσης είναι ελαφρώς μικρότερο από 3/μ· Οι φλέβες που δημιουργούνται από ορθογωνικό, με λόγο πλευρών 2:1, ακροφύσιο διεισδύουν σε μικρότερο βάθος, δηλώνοντας έτσι ότι συμπαρασύρουν περισσότερο περιβάλλον υγρό απ’ ότι οι φλέβες από κυκλικό, τριγωνικό ή τετραγωνικό ακροφύσιο. Στις κατακόρυφες φλέβες θερμού νερού αρνητικής άνωσης, η αρχική άνωση της φλέβας δεν διατηρείται σε ολόκληρο το πεδίο ροής (Kotsovinos, 1975). Παρατηρούμε ότι για Ro<0.3, Ζ//μ~2. Η παρούσα τιμή δεν διαφέρει ουσιαστικά από αυτή των πειραμάτων με αλατόνερο για τα κυκλικά ακροφύσια. Επομένως, οι κατακόρυφες θερμαινόμενες φλέβες σχετικά με το βάθος διείσδυσης, συμπεριφέρονται σαν κατακόρυφες φλέβες σταθερής αρνητικής άνωσης. Για αριθμούς Richardson μεγαλύτερους του 0.3 παρατηρούμε ότι το αδιάστατο βάθος διείσδυσης μειώνεται. Το μέγιστο βάθος διείσδυσης στα πειράματα με θερμό νερό δεν ήταν δυνατό να προσδιοριστεί.
title: Αλληλεπίδραση δενδρόμορφων μυκορριζικών στελεχών με τον ενδοσυμβιωτικό μύκητα fusarium solani στέλεχος FsK σε ρίζες τομάτας
titleType: AlternativeTitle
Creators: name: Πούλιος, Σωκράτης
Publisher: name: University of Thessaly
Year: 2010
Subjects: subject: ΜΥΚΟΡΡΙΖΕΣ
subject: ΜΥΚΗΤΕΣ

description: Η κοινή επιφάνεια ανάμεσα στο έδαφος και τις ρίζες ή εναλλακτικά ο χώρος που περιβάλλει τις ρίζες και επηρεάζεται από αυτές είναι η ριζόσφαιρα. Ένας χώρος υψηλών μικροβιακών πληθυσμών, έντονης μικροβιολογικής δραστηριότητας και ταχύτατων αλλαγών. Οι μικροοργανισμοί που βρίσκονται στη ριζόσφαιρα βασίζουν την ύπαρξη τους κατά κόρον στον ανταγωνισμό για την διάθεση τροφής, με σημαντικές επιδράσεις στην ανάπτυξη και παραγωγή των φυτών, στην ανακύκλωση των θρεπτικών στοιχείων και την διαθεσιμότητα τους στα φυτά. Εκτός από τον ανταγωνισμό των μικροοργανισμών, στη ριζόσφαιρα έχει παρατηρηθεί και το φαινόμενο της αλληλεπίδρασης των διαφόρων μικροοργανισμών που έχει σαν αποτέλεσμα πολλές φορές την προστασία του φυτού έναντι άλλων παθογόνων. Μελέτες έχουν δείξει ότι μη παθογόνα στελέχη καθώς και μύκητες που δημιουργούν συμβιωτική σχέση με τα φυτά (μυκόρριζες), ανεξάρτητα από την μεμονωμένη δράση τους, όταν βρεθούν στο ίδιο περιβάλλον με ανταγωνιστή ή συμβιώτη τότε παρατηρείται διαφορετική εξέλιξη στην ανάπτυξη των φυτών. Η εξέλιξη αυτή ποικίλλει ανάλογα τους μικροοργανισμούς που συμμετέχουν. Η αποτελεσματικότητα της συνδυασμένης δράσης μυκορριζικών και ωφέλιμων ανταγωνιστικών μυκήτων προϋποθέτει την ομαλή αλληλεπίδρασή τους εντός του φυτικού οργανισμού. Ένα ενδοφυτικό στέλεχος μύκητα, Fusarium solani στέλεχος FsK, είναι ικανό να ενισχύει την αύξηση της βιομάζας των φυτών και να επάγει αμυντικούς μηχανισμούς ενάντια των παθογόνων του ριζικού συστήματος και του φυλλώματος φυτών τομάτας (Kavroulakis κ.α. 2007 και μη δημοσιευμένα αποτελέσματα). Η ομόχρονη ανάπτυξή του στο ριζικό σύστημα φυτών τομάτας με έναν δενδροειδή μυκορριζικό μύκητα του γένους Glomus, ικανού να βελτιώνει τη θρεπτική και υδατική κατάσταση του φυτού, ενδέχεται να επιδρά στην ικανότητα εξάπλωσης αμφότερων των μυκήτων Σκοπός της παρούσας εργασίας είναι η μελέτη της επίδρασης δύο μυκήτων, ενός ενδοφυτικού (.Fusarium solani στέλεχος FsK-gfp) και ενός μυκορριζικού ('Glomus intraradices), στον αμοιβαίο αποικισμό του ριζικού συστήματος φυτών τομάτας καθώς και στην ανάπτυξη των διαφόρων μορφολογικών μυκορριζικών δομών.
Acoustic radiation force due to sound beams incident on spherical scatterers in soft tissue-like media
Creators: name: Treweek, Benjamin Charles
name: 0000-0002-6885-2563
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Acoustics
Nonlinear acoustics
Acoustic radiation force
Soft elastic media
Focused sound beams
Spherical harmonic expansion of waves
Elastic wave scattering from spheres
Helmholtz decomposition

description: This dissertation presents a theory for acoustic radiation force on a spherical scatterer embedded in a soft elastic medium that supports the propagation of shear waves. Existing theories for acoustic radiation force on a sphere are restricted to a fluid surrounding the sphere. Potential applications reside in biology and medicine. For example, the mechanical properties of soft tissue, in particular its shear stiffness, are a useful proxy for tissue health and can be used for non-invasive tissue characterization. The present work investigates the effect that shear elasticity in the surrounding medium has on the radiation force on an embedded spherical scatterer. The theory is developed in Lagrangian coordinates, instead of Eulerian coordinates that are traditionally used for a fluid surrounding the sphere. It is assumed that a compressional wave is incident on the sphere. Coefficients in the spherical harmonic expansions describing the incident compressional wave field, and the scattered compressional and shear wave fields, are examined in detail. The radiation force is separated into two contributions, one that corresponds to the scattered compressional waves and the other to the scattered shear waves, both of which displace the sphere from its initial position. The compressional wave contribution can be determined analytically, and a variety of material properties for the sphere and incident beam patterns are examined for this contribution. The shear wave contribution has yet to be determined analytically, and is investigated numerically. A third contribution, corresponding to the static deformation of the surrounding medium due to the scattered shear wave, is also investigated numerically. A finite element method is used to determine the full effect of the scattered shear wave on the sphere displacement, and it is found that effects due to the scattered shear wave may be of the same order as those due to the scattered compressional wave.
Model-Free Approach to Fair Solar PV Curtailment Using Reinforcement Learning
Creators: name: Wei, Zhuo
name: de Nijs, Frits
name: Li, Jinhao
name: Wang, Hao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The rapid adoption of residential solar photovoltaics (PV) has resulted in regular overvoltage events, due to correlated reverse power flows. Currently, PV inverters prevent damage to electronics by curtailing energy production in response to overvoltage. However, this disproportionately affects households at the far end of the feeder, leading to an unfair allocation of the potential value of energy produced. Globally optimizing for fair curtailment requires accurate feeder parameters, which are often unknown. This paper investigates reinforcement learning, which gradually optimizes a fair PV curtailment strategy by interacting with the system. We evaluate six fairness metrics on how well they can be learned compared to an optimal solution oracle. We show that all definitions permit efficient learning, suggesting that reinforcement learning is a promising approach to achieving both safe and fair PV coordination.
A comparative analysis of flight crew vacation allocation models
Creators: name: Liang, Zhaowei
name: 0000-0001-7369-6828
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Vacation scheduling
Flight crew vacation scheduling
Mixed integer programming
Numerical analysis

description: The airline industry has a long lasting history of using operations research for complex problems like crew scheduling, crew pairing, and aircraft tail assignment. However, the use of the optimization and operations research on crew vacation planning is not widespread. One of the most popular ways of assigning vacations currently is to let crew members bid for vacations using a heuristic preferential bidding system (PBS). This report will overview the existing problems in the crew vacation allocation domain. Then, it will introduce and compare an optimization based vacation allocation algorithm, an improved heuristic PBS model, and the original heuristic PBS model. Models will be compared using three performance measures as the number of unassigned vacation blocks, the number of crew members without any assigned vacation blocks, and the rank order of the preferences that are awarded to the crew members. This report also conducts a sensitivity analysis for the improved PBS model using the same performance measures
Direct tunneling through high-$κ$ amorphous HfO$_2$: effects of chemical modification
Creators: name: Wang, Yin
name: Yu, Zhizhou
name: Zahid, Ferdows
name: Liu, Lei
name: Zhu, Yu
name: Wang, Jian
name: Guo, Hong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report first principles modeling of quantum tunneling through amorphous HfO$_2$ dielectric layer of metal-oxide-semiconductor (MOS) nanostructures in the form of n-Si/HfO$_2$/Al. In particular we predict that chemically modifying the amorphous HfO$_2$ barrier by doping N and Al atoms in the middle region - far from the two interfaces of the MOS structure, can reduce the gate-to-channel tunnel leakage by more than one order of magnitude. Several other types of modification are found to enhance tunneling or induce substantial band bending in the Si, both are not desired from leakage point of view. By analyzing transmission coefficients and projected density of states, the microscopic physics of electron traversing the tunnel barrier with or without impurity atoms in the high-$κ$ dielectric is revealed.
description: 5 pages, 5 figures
Popular humor and the collective acceptance of breakthrough innovations
Creators: name: Sharek, Julie Anne
name: 0000-0002-5270-9367
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Radical innovation
Humor
Technology acceptance

description: Breakthrough innovations are strikingly unfamiliar additions to everyday life, and novel technologies encounter significant barriers en route toward successful commercialization and widespread acceptance within a given society. This dissertation examines popular humor as a distinctive form of adaptive discourse that communities engage in as they negotiate the potential domestication of a breakthrough innovation. The link between popular humor and collective-level responses to breakthrough innovations is explored via a theory-building, in-depth historical case analysis of major joke cycles during the introduction of the automobile (1897-1929). Analysis of 2,627 jokes, supplemental cultural ephemera, and contemporaneous media accounts reveals the significance of humor as distinctive form of discourse and demonstrates how popular humor can facilitate evolving acceptance of a previously resisted breakthrough technology. In sum, this study extends our understanding of social, cultural, and emotional processes that influence the trajectories of radical innovations, draws attention to collective-level, identity-based forces embedded in the rhythms of everyday life that influence the acceptance or rejection of breakthrough innovations, and introduces humor as a mechanism for negotiating the meaning of novel technologies in society.
How the cosmic web induces intrinsic alignments of galaxies
Creators: name: Codis, Sandrine
name: Dubois, Yohan
name: Pichon, Christophe
name: Devriendt, Julien
name: Slyz, Adrianne
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Intrinsic alignments are believed to be a major source of systematics for future generation of weak gravitational lensing surveys like Euclid or LSST. Direct measurements of the alignment of the projected light distribution of galaxies in wide field imaging data seem to agree on a contamination at a level of a few per cent of the shear correlation functions, although the amplitude of the effect depends on the population of galaxies considered. Given this dependency, it is difficult to use dark matter-only simulations as the sole resource to predict and control intrinsic alignments. We report here estimates on the level of intrinsic alignment in the cosmological hydrodynamical simulation Horizon-AGN that could be a major source of systematic errors in weak gravitational lensing measurements. In particular, assuming that the spin of galaxies is a good proxy for their ellipticity, we show how those spins are spatially correlated and how they couple to the tidal field in which they are embedded. We also present theoretical calculations that illustrate and qualitatively explain the observed signals.
description: 6 pages, contribution to the proceedings of IAU Symposium 308 "The Zeldovich Universe: Genesis and Growth of the Cosmic Web"
Proximal Policy Optimization Based Reinforcement Learning for Joint Bidding in Energy and Frequency Regulation Markets
Creators: name: Anwar, Muhammad
name: Wang, Changlong
name: de Nijs, Frits
name: Wang, Hao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Driven by the global decarbonization effort, the rapid integration of renewable energy into the conventional electricity grid presents new challenges and opportunities for the battery energy storage system (BESS) participating in the energy market. Energy arbitrage can be a significant source of revenue for the BESS due to the increasing price volatility in the spot market caused by the mismatch between renewable generation and electricity demand. In addition, the Frequency Control Ancillary Services (FCAS) markets established to stabilize the grid can offer higher returns for the BESS due to their capability to respond within milliseconds. Therefore, it is crucial for the BESS to carefully decide how much capacity to assign to each market to maximize the total profit under uncertain market conditions. This paper formulates the bidding problem of the BESS as a Markov Decision Process, which enables the BESS to participate in both the spot market and the FCAS market to maximize profit. Then, Proximal Policy Optimization, a model-free deep reinforcement learning algorithm, is employed to learn the optimal bidding strategy from the dynamic environment of the energy market under a continuous bidding scale. The proposed model is trained and validated using real-world historical data of the Australian National Electricity Market. The results demonstrate that our developed joint bidding strategy in both markets is significantly profitable compared to individual markets.
Coherence for Skew-Monoidal Categories
Creators: name: Uustalu, Tarmo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: Category Theory (math.CT)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: F.4.1

description: I motivate a variation (due to K. Szlachányi) of monoidal categories called skew-monoidal categories where the unital and associativity laws are not required to be isomorphisms, only natural transformations. Coherence has to be formulated differently than in the well-known monoidal case. In my (to my knowledge new) version, it becomes a statement of uniqueness of normalizing rewrites. I present a proof of this coherence theorem and also formalize it fully in the dependently typed programming language Agda.
description: In Proceedings MSFP 2014, arXiv:1406.1534
Asymptotic Approximation for the Solution to a Semi-linear Parabolic Problem in a Thick Fractal Junction
Creators: name: Mel'nyk, Taras A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B27, 74K30, 35B40, 35K57, 49J27

description: We consider a semi-linear parabolic problem in a model plane thick fractal junction $Ω_{\varepsilon}$, which is the union of a domain $Ω_{0}$ and a lot of joined thin trees situated $\varepsilon$-periodically along some interval on the boundary of $Ω_{0}.$ The trees have finite number of branching levels. The following nonlinear Robin boundary condition $\partial_νv_{\varepsilon} + \varepsilon^{α_i} κ_i(v_{\varepsilon}) = \varepsilon^{β_i} g^{(i)}_{\varepsilon}$ is given on the boundaries of the branches from the $i$-th branching layer; $α_i$ and $β_i$ are real parameters. The asymptotic analysis of this problem is made as $\varepsilon\to0,$ i.e., when the number of the thin trees infinitely increases and their thickness vanishes. In particular, the corresponding homogenized problem is found and the existence and uniqueness of its solution in an anizotropic Sobolev space of multi-sheeted functions is proved. We construct the asymptotic approximation for the solution $v_\varepsilon$ and prove the corresponding asymptotic estimate in the space $C\big([0,T]; L^2(Ω_\varepsilon) \big) \cap L^2\big(0, T; H^1(Ω_\varepsilon)\big)$, which shows the influence of the parameters $\{α_i\}$ and $\{β_i\}$ on the asymptotic behavior of the solution.
description: 29 pages, 4 figures
title: Εκτίμηση της χωρικής παραλλακτικότητας ορισμένων εδαφικών ιδιοτήτων σε εδάφη που καλλιεργείται αμπέλι και συσχέτιση αυτών με την περιεκτικότητα των φύλλων αμπέλου σε θρεπτικά συστατικά, στην περιοχή της Γουμένισσας, στα πλαίσια της Γεωργίας Ακριβείας
titleType: AlternativeTitle
Creators: name: Μεζίτη, Στυλιανή Γ.
Publisher: name: University of Thessaly
Year: 2003
Subjects: subject: ΑΜΠΕΛΟΥΡΓΙΑ -- ΕΡΕΥΝΑ
subject: ΦΥΤΑ -- ΣΧΕΣΕΙΣ ΜΕ ΤΟ ΕΔΑΦΟΣ -- ΕΡΕΥΝΑ

description: Στην παρούσα μεταπτυχιακή διατριβή μελετήθηκαν ορισμένες εδαφικές ιδιότητες ενός αμπελώνα, έκτασης 16 στρεμμάτων, βιολογικής καλλιέργειας καθώς και η περιεκτικότητα των φύλλων αμπέλου, του συγκεκριμένου αμπελώνα σε θρεπτικά στοιχεία. Συγκεκριμένα σε 53 εδαφικά δείγματα έγινε η μελέτη των εξής φυσικοχημικών ιδιοτήτων : pH, E.C., Φαινομενική Πυκνότητα, Διαθέσιμος Φώσφορος, Διαθέσιμος Ψευδάργυρος, Διαθέσιμος Χαλκός, Διαθέσιμος Σίδηρος, Διαθέσιμο Μαγνήσιο και Διαθέσιμο Μαγγάνιο. Επίσης έγιναν δύο δειγματοληψίες φύλλων, η πρώτη στις 6-8-2002 και η δεύτερη στις 10-9-2002. Στα δείγματα φύλλων προσδιορίστηκε η περιεκτικότητα, σε Κάλιο, Φώσφορο, Ασβέστιο, Ψευδάργυρο, Χαλκό, Σίδηρο, Μαγγάνιο, Μαγνήσιο και Βόριο. Επίσης προσδιορίστηκε και η περιεκτικότητα σε χλωροφύλλη. Οι τιμές των θρεπτικών στοιχείων στα εδαφικά δείγματα κυμάνθηκαν γενικά σε χαμηλά επίπεδα με εξαίρεση το χαλκό, του οποίου οι τιμές ήταν ιδιαίτερα υψηλές λόγω των ψεκασμών με χαλκούχα σκευάσματα που είχε δεχτεί ο υπό μελέτη αμπελώνας. Ο εφοδιασμός σε θρεπτικά στοιχεία των φύλλων και στις δύο δειγματοληψίες ήταν επαρκής για τα στοιχεία : Σίδηρος, Μαγγάνιο, Ασβέστιο και Μαγνήσιο και ανεπαρκής για τα στοιχεία : Φώσφορος και Κάλιο. Τα φύλλα που προέρχονταν απ’ την πρώτη δειγματοληψία ήταν οριακά εφοδιασμένα με Βόριο και Ψευδάργυρο ενώ οι τιμές του χαλκού ήταν υψηλές λόγω των ψεκασμών με χαλκούχα σκευάσματα που προαναφέρθηκαν. Κατά τη δεύτερη δειγματοληψία η περιεκτικότητα σε μαγνήσιο μειώθηκε σε επίπεδα ανεπάρκειας. Ανάλυση παλινδρόμησης μεταξύ συγκέντρωσης θρεπτικών στο έδαφος και στα φύλλα έδειξε ότι μεταξύ αυτών δεν υπήρχε στατιστικά σημαντική συσχέτιση. Τέλος, προκειμένου να γίνει καλύτερη απεικόνιση της χωρική παραλλακτικότητας, με τη χρήση των Γεωγραφικών Συστημάτων Πληροφοριών έγιναν ψηφιακοί θεματικοί χάρτες, διαγράμματα τάσης, ιστογράμματα κατανομής συχνοτήτων και διαγράμματα της ημιπαραλλακτικότητας για όλες τις ιδιότητες που προσδιορίστηκαν στα εδαφικά δείγματα και στα δείγματα των φύλλων.
Virtual fixture generation for task planning with complex geometries
Creators: name: Sharp, Andrew Patrick
name: 0000-0002-2552-4340
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Robotics
Virtual fixtures
Task Virtual Fixtures

description: Decontaminating and decommissioning aging nuclear facilities and managing nuclear waste required increased automation to reduce personnel dose. Semi-autonomous behaviors, such as virtual fixtures, aid task execution by managing low-level system resources while operators retain high-level control. Virtual fixtures provide operators with geometric constraints or guidance forces in a robotic manipulator’s workspace. This dissertation advances virtual fixture generation through, the previously unexplored, construction of layers of point cloud based Guidance Virtual Fixtures. Point clouds are used for virtual fixture generation, based on complex surface geometry, to provide more expressive, and therefore useful, environmental representations. Thus, this work builds upon previous point cloud based Forbidden Region Virtual Fixtures to address virtual fixture generation shortcomings outlined in the literature. Task input polygonal mesh checks warn operators if defects are found. Task normal vectors and task parameters are used to calculate point cloud layers at task defined distances from the surface. These layers are interpolated and voxelized to maintain point cloud resolution at increasing distances from the task surface. The layers are combined into a bi-directional graph structure for storage and future use. The graph structure is combined with a Forbidden Region Virtual Fixture to create a Task Virtual Fixture. Task Virtual Fixture generation was evaluated with multiple input types including parametric surfaces, polygonal meshes, and point cloud data. Results demonstrate surface model concavity affects the growth in the number of offset layer vertices as does distance from the task surface. Task Virtual Fixture generation intuitively modifies VF layer resolution at extended task surface distances. Point cloud sensor data demonstrated sensor data input for "open world" scenarios. Two visualization and task execution environments were developed to apply Task Virtual Fixtures to spatially discrete and spatially continuous non-contact tasks. The first interface, spatially discrete, was constructed with the Robot Operating System, RViz, and MoveIt!. This interface displays reachability information to the operator and is called the Manipulator to Task Transform Tool. The second interface allows operators to employ Task Virtual Fixture information in ABB’s RobotStudio for spatially continuous tasks. A small user study was conducted for each interface to demonstrate more expressive Task Virtual Fixtures are still operator interpretable and assist with task execution.
Domain walls coupled to matter: the symmetron example
Creators: name: Llinares, Claudio
name: Pogosian, Levon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study properties of domain walls in the symmetron model, in which the scalar gravitational degree of freedom decouples from matter in regions of high density, and exhibits a spontaneously broken $Z_2$ symmetry at low densities. The non-minimal coupling of the scalar to matter leads to a host of interesting properties of the domain walls that are not present in minimally coupled theories. We estimate the cosmological energy fraction in domain walls and find that this leads to an upper bound on the redshift of the symmetry breaking. We also show that a spherical symmetron wall can remain stable if it is "pinned" on matter halos and derive a criterion for the stability. In addition, we present results of numerical simulations of representative interactions between domain walls and matter over-densities.
description: 12 pages, 6 figures
No really. I’m fine. : an installation inspired by conditions we can’t or won’t see
Creators: name: Mojica, Roxenia A.
name: 0000-0002-3544-6411
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Mental illness
Design
Perception
Artists
Madness
Creativity
Mental health
Empathy for mentally ill
Mentally ill advocacy
Stigma of mentally ill
Invisibility of mental illness
Scenic design
Evocative scenic design
Eliciting empathy
Empathy-eliciting scenic design

description: Mental health has always been a topic that sparked my interest, not only because it affects many people close to me, but also because it affects many more in our general population who are simply just existing day to day. As I have pushed myself further into an artistic career, I seem to find many around me who live with a mental ailment of some sort. This observation has lead me to explore a link between creativity and madness, studying the art of the institutionalized, regardless of whether their art was ever appreciated as art or not. Furthermore, it has left me frustrated at the lack of empathy directed towards those in our population who are outcast and overlooked for something that is out of their control. I wanted to do this project as an ally to those who cannot call themselves mentally healthy. It felt important to let them know that I see them and that others should too. How does one create empathy in a population for something that cannot be seen? Using my background in scenic design, and applying the same skill set I would use to evoke emotion from an audience, I am exploring how I can design an evocative three-dimensional space. The goal was eliciting empathy and understanding from an observer who may not have that disorder without alienating an observer who does
Pensare la Primavera di Praga: tra disillusione, lutto e melanconia.
Creators: name: Kolář, Pavel
Publisher: name: Universita' degli Studi di Salerno
Year: 2019
Subjects: Disillusion
European left
Melancholy
Mourning
Post-stalinism
Prague spring
Reform communism
1968

description: This essay seeks to raise the question of how the Prague Spring and its suppression mattered for the subsequent history of the European Left. Did its defeat, by allegedly expelling any genuinely democratic socialism into the realm of utopia, contribute to the overall decline of leftwing militancy? Within this problematic, I first touch upon the conceptual pair of ‘illusion’ and ‘disillusion’ that has significantly shaped the post-1968 discourse on the Left. Second, I suggest a perspective on the Prague Spring (and on waning socialism in general) that draws on the recent debates on the importance of melancholia and mourning for the history of socialism. Can the sense of loss have a productive, transformative effect? I conclude by proposing several aspects of socialism’s decline, considering how the
title: Εξάπλωση μεταλλάξεων που σχετίζονται με την ανθεκτικότητα του δάκου της ελιάς σε οργανοφωσφορικά εντομοκτόνα
titleType: AlternativeTitle
Creators: name: Σαγρή, Ευθυμία Χ.
Publisher: name: University of Thessaly
Year: 2009
Subjects: subject: ΕΛΑΙΑ -- ΑΣΘΕΝΕΙΕΣ ΚΑΙ ΠΑΡΑΣΙΤΑ
subject: ΔΑΚΟΣ ΤΗΣ ΕΛΙΑΣ

description: Ο δάκος της ελιάς αποτελεί τον βασικότερο εχθρό για την ελιά στις χώρες γύρω από τη λεκάνη της Μεσογείου. Η προκαλούμενη ζημιά μπορεί να φτάσει το 50- 60 % της παραγωγής των ελαιόδεντρων. Τα τελευταία χρόνια όλες οι προσπάθειες καταπολέμησης του γινότανε μέσω χημικών ουσιών με αποτέλεσμα το έντομο λόγω επιλογής να αποκτήσει ανθεκτικότητα κυρίως στα οργανοφωσφορικά εντομοκτόνα και να είναι εμφανής μέσω μεταλλάξεων στο νευρικό του σύστημα. Συνολικά στον δάκο έχουν βρεθεί τρεις μεταλλάξεις: δύο στο ενεργό κέντρο του ενζύμου της ακετυλοχολινεστεράσης και μια μικρή έλλειψη στο καρβοξυτελικό άκρο της πρωτεΐνης (Boace A3Q). Στην παρούσα εργασία μελετήθηκε η εξάπλωση της μετάλλαξης Boace A3Q σε φυσικούς πληθυσμούς δάκου σε περιοχές τις λεκάνης της Μεσογείου. Συνολικά μελετήθηκαν 241 δάκοι από 8 διαφορετικές περιοχές. Τα αποτελέσματα της ανάλυσης μας έδειξαν εξάπλωση της συγκεκριμένης μετάλλαξης ωστόσο όμως υπάρχουν και άλλοι παράγοντες που πρέπει να ληφθούν υπ’ όψιν στο θέμα της ανθεκτικότητας.
Stochastically timed predicate-based communication primitives for autonomic computing
Creators: name: Latella, Diego
name: Loreti, Michele
name: Massink, Mieke
name: Senni, Valerio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Programming Languages (cs.PL)
subject: Logic in Computer Science (cs.LO)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Predicate-based communication allows components of a system to send messages and requests to ensembles of components that are determined at execution time through the evaluation of a predicate, in a multicast fashion. Predicate-based communication can greatly simplify the programming of autonomous and adaptive systems. We present a stochastically timed extension of the Software Component Ensemble Language (SCEL) that was introduced in previous work. Such an extension raises a number of non-trivial design and formal semantics issues with different options as possible solutions at different levels of abstraction. We discuss four of these options, of which two in more detail. We provide a formal semantics definition and an illustration of the use of the language modeling a bike sharing system, together with some preliminary analysis of the system performance.
description: In Proceedings QAPL 2014, arXiv:1406.1567
Subdifferential set of an operator
Creators: name: Rao, Taduri Srinivasa Siva Rama Krishna
Publisher: name: arXiv
Year: 2022
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L05 46B20

description: In this paper we study the subdifferential set of an operator. We give possible relation of the subdifferential set of an operator to that of its value, at a point where the operator attains its norm.
description: 12 pages
Best approximation in spaces of compact operators
Creators: name: Rao, Taduri Srinivasa Siva Rama Krishna
Publisher: name: arXiv
Year: 2022
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L05 41A50 46B28

description: For a closed subspace of the range space, we give conditions under which the subspace valued compact operators forms a proximinal subspace of compact operators into the range space.
description: 11 pages
Cosmological Model Tests with JWST
Creators: name: Lovyagin, Nikita
name: Raikov, Alexander.
name: Yershov, Vladimir
name: Lovyagin, Yuri
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The James Webb Space Telescope (JWST), which has recently become operational, is capable of detecting objects at record-breaking redshifts, $z \gtrsim 15$. This is a crucial advance for observational cosmology, as at these redshifts the differences between alternative cosmological models manifest themselves in the most obvious way. In recent years, some observational hints have emerged indicating that the Standard Cosmological Model could require correcting. One of these hints is related to the discovery of remote galaxies whose redshifts correspond to the very young Universe (less than one billion years after the Big Bang) but which are similar to nearby galaxies. The issue is that such galaxies in the early Universe do not have enough time to evolve into something similar to the late-Universe galaxies. JWST observations of high-redshift objects are expected to shed light on the origin of this issue. Here we provide results on performing the ``angular diameter -- redshift'' cosmological test for the first JWST observation data. We compare this result with predictions of the standard $Λ$CDM cosmological model and some static cosmological models, including Zwicky's ``tired-light'' model. The latter is currently assumed to be ruled out by observations. We challenge this assumption and show that a static model can provide a natural and straightforward way of solving the puzzle of the well-evolved galaxies and better agreements with the results of the JWST ``angular diameter -- redshift'' test at higher redshifts than the correcting evolution model within the $Λ$CDM framework. We discuss several cosmological tests that will be important for further research on the possibility of revising the expanding Universe paradigm.
description: 27 pages, 6 figures, 131 references
Fusarium fujikuroi
Creators: name: Maryani, N.
name: Sandoval-Denis, M.
name: Lombard, L.
name: Crous, P. W.
name: Kema, G. H. J.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Sordariomycetes
Hypocreales
Nectriaceae
Fusarium
Fusarium fujikuroi

description: Fusarium fujikuroi species complex (FFSC) phylogeny The eight isolates belonging to the FFSC were further analysed using a multi-gene phylogeny based on cmdA, rpb1, rpb2, tef1, and tub. The final alignment included 4 795 characters (cmdA 545, rpb1 1534, rpb2 1551, tef 677 and tub 488) including align- ment gaps, and encompassed 54 isolates, with two outgroup taxa (F. oxysporum CBS 716.74 and CBS 744.97) (Table 2). The analysis was consistently able to distinguish the three biogeographical clades known as the African,American and Asian clades sensu O’Donnell et al. (1998 a). All of the Indonesian isolates clustered within the Asian clade of FFSC except for isolate InaCC F 991, identified as F. verticilloides, and clustered within the African clade (Fig. 2). According to the multi-gene analysis, two isolates (InaCC F 962 and InaCC F 992) were identified as F. proliferatum, while two new phylogenetic species were recognised among the Indonesian isolates. Isolates InaCC F 872 and InaCC F 993, from central and East Java, respectively, clustered in a distinct, highly supported clade (96 bs/0.99 pp) closely related to F. mangiferae. Isolates InaCC F 950–152, formed a distinct group (100 bs/1.0 pp), closely related to, but genetically distinct from F. sacchari.
description: Published as part of Maryani, N., Sandoval-Denis, M., Lombard, L., Crous, P. W. & Kema, G. H. J., 2019, New endemic Fusarium species hitch-hiking with pathogenic Fusarium strains causing Panama disease in small-holder banana plots in Indonesia, pp. 48-69 in Persoonia 43 on pages 57-58, DOI: 10.3767/persoonia.2019.43.02, http://zenodo.org/record/3565708
description: {"references": ["O'Donnell K, Cilgenik E, Nirenberg HI. 1998 a. Molecular systematics and phylogeography of the Gibberella fujikuroi species complex. Mycologia 90: 465 - 493."]}