cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Generating coherent phonon waves in narrow-band materials: a twisted bilayer graphene phaser
Creators: name: Esin, Iliya
name: Esterlis, Ilya
name: Demler, Eugene
name: Refael, Gil
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Twisted bilayer graphene (TBG) exhibits extremely low Fermi velocities for electrons, with the speed of sound surpassing the Fermi velocity. This regime enables the use of TBG for amplifying vibrational waves of the lattice through stimulated emission, following the same principles of operation of free-electron lasers. Our work proposes a lasing mechanism relying on the slow-electron bands to produce a coherent beam of acoustic phonons. We propose a device based on undulated electrons in TBG, which we dub the phaser. The device generates phonon beams in a terahertz (THz) frequency range, which can then be used to produce THz electromagnetic radiation. The ability to generate coherent phonons in solids breaks new ground in controlling quantum memories, probing quantum states, realizing non-equilibrium phases of matter, and designing new types of THz optical devices.
description: 5 pages, 3 figures + supplementary material
A COMPLETE KINEMATIC, KINETIC, AND ELECTROMYOGRAPHICAL ANALYSIS OF THE FOOTBALL THROW IN COLLEGIATE QUARTERBACKS
Creators: name: Bohnert, Kyle R.
Publisher: name: University of Kentucky
Year: 2016
Subjects: subject: Biomechanics

description: The biomechanics of the overhead throw has been extensively studied in regards to baseball pitching. However, an understanding of the proper mechanics needed to successfully throw a football has not previously been investigated. Thus, the purpose of this study was to investigate the kinematics, kinetics, and electromyography of the football throws in elite quarterbacks. Three collegiate quarterbacks were evaluated using a multi-camera motion capture system and electromyography electrodes. The results of this study are able to give a breakdown in the types of mechanics needed in each of the phases of the throw. This study demonstrated that during the early cocking phase, most of the movement seen in the upper body occurs in the frontal plane to abduct the shoulder. During the late cocking phase, the shoulder holds a constant abduction angle and begins to externally rotate. The shoulder reaches a value of 117° of external rotation, much less than has previously been reported. During the acceleration phase, the shoulder rapidly internally rotates as well as horizontally adducts. Once the ball is released, the shoulder has to produce large forces and muscle activity to slow down the rotation. These results will be able to give coaches and players a tool for what to look for when evaluating the mechanics of an individual.
title: Deep Learning Techniques in Portfolio Optimization under Constraints
Creators: name: Wiedermann, Kristof
Publisher: name: TU Wien
Year: 2021
Subjects: subject: Portfoliooptimierung unter Restriktionen
subject: Nutzenmaximierungsproblem
subject: duales Problem
subject: Deep Learning
subject: maschinelles Lernen
subject: stochastisches Maximumprinzip
subject: Ansatz der stochastischen Steuerung
subject: Portfolio optimization under constraints
subject: utility maximization problem
subject: dual problem
subject: deep learning
subject: machine learning
subject: stochastic maximum principle
subject: dynamic programming approach

description: We consider the constrained utility maximization problem and the corresponding dual problem with regard to theoretical results which allow the formulation of algorithmic solvers which make use of deep learning techniques. We place great emphasis on detailed proofs of the underlying theoretical results. At first, the deep controlled 2BSDE algorithm from [5] is derived in a Markovian setting. It combines the dynamic programming approach with the adjoint equation from the stochastic maximum principle (SMP). In the case of random coefficients, we prove stochastic maximum principles for the primal and the dual problem, respectively. Furthermore, we show that the strong duality property holds under additional assumptions. This leads to the formulation of the deep SMP algorithm as in [5]. Moreover, we use the aforementioned result for the primal problem for defining a new algorithm, which we call deep primal SMP algorithm. Numerical examples illustrate the effectiveness of the studied algorithms - in particular for higher-dimensional problems and problems with random coefficients, which are either path dependent or satisfy their own SDEs. Moreover, our numerical experiments for constrained problems show that the novel deep primal SMP algorithm overcomes the deep SMP algorithm's weakness of erroneously producing the value of the corresponding unconstrained problem. Furthermore, in contrast to the deep controlled 2BSDE algorithm, this algorithm is also applicable to problems with path dependent coefficients. As the deep primal SMP algorithm even yields the most accurate results in many of our studied problems, we can highly recommend its usage.
Public involvement and community planning: the redesign of services for children and families in southwestern Alberta
Creators: name: Stroick, Sharon M.
Publisher: name: Environmental Design
Year: 1998
Subjects: subject: HV109 .A54 S77 1998
subject: Social service - Alberta - Citizen participation
subject: Social service - Alberta - Planning.
subject: Regional planning - Alberta - Citizen participation.

description: Bibliography: p. 365-399
description: UARC
Sistem pobude PSM1-410.57-221079 sinhronog motora nazivne snage  6,7 MW, faktora snage cosfi 0,95i napona 6 kV kompresora TKV-1  kompanije "Messer Tehnogas AD" u Fabrici Smederevo
Creators: name: Stojić, Đorđe
name: Kovačević, Nikola
name: Milojčić, Nemanja
name: Ninković, Predrag
name: Ivanović, Luka
Publisher: name: Zenodo
Year: 2023

description: Pobudni sistem u okviru tehničkog rešenja je namenjen za upravljanje pobudom sinhronog motora kompresora TKV-1 u fabrici industrijskih gasova "Messer Tehnogas AD" - Smederevo. Sinhroni motor je instaliran u postrojenju za proizvodnju tečnog kiseonika u sprezi pokretanja sa prigušnicom za meki start, i radi sa sledećim nazivnim veličinama: napon statora od 6 kV, aktivna snaga 6,7 MW, faktor snage cosfi = 0,95, napon pobude 57 V, struja pobude 410 A. Aktivnim opterećenjem se upravlja kroz doziranje mehaničkog opterećenja iz proizvodnog procesa, dok se upravljanje reaktivnom snagom koju taj motor uzima ili predaje mreži vrši sistemom za pobuđivanje kroz kontrolu struje pobudnog namotaja. Upravljanje se može vršiti po jednom od izabranih režima rada: ručnoj regulaciji struje pobude, regulaciji reaktivne snage motora, kao i regulaciji faktora snage motora. Uređaj za regulaciju pobude je izveden kao tiristorski punoupravljivi šestopulsni ispravljački pobudni stepen napojen od strane izvora nominalnog napona 3 x 380 V / 50Hz uz primenu savremene mikroprocesorske tehnologije za logičku kontrolu procesa, regulaciju zadatih veličina i zaštitu od neregularnih radnih uslova. Primenom ekrana osetljivog na dodir je realizovan interfejs sa korisnikom na jednostavan način tako da mu se brzo i razumljivo saopštavaju svi vitalni parametri pogona, omogućava unošenje novih radnih parametara, uvid u merene veličine, arhivu događaja i arhivu grešaka. Veliki broj ugrađenih zaštita obezbeđuje siguran i pouzdan rad uređaja, jasan prikaz uzroka greške i brzu dijagnostiku i otklanjanje kvara.
The Morphology of Reionization in a Dynamically Clumpy Universe
Creators: name: Cain, Christopher
name: D'Aloisio, Anson
name: Gangolli, Nakul
name: McQuinn, Matthew
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: A recent measurement of the Lyman-limit mean free path at $z = 6$ suggests it may have been very short, motivating a better understanding of the role that ionizing photon sinks played in reionization. Accurately modeling the sinks in reionization simulations is challenging because of the large dynamic range required if $\sim 10^4-10^8 M_{\odot}$ gas structures contributed significant opacity. Thus, there is no consensus on how important the sinks were in shaping reionization's morphology. We address this question with a recently developed radiative transfer code that includes a dynamical sub-grid model for the sinks based on radiative hydrodynamics simulations. Compared to assuming a fully pressure-smoothed IGM, our dynamical treatment reduces ionized bubble sizes by $10-20\%$ under typical assumptions about reionization's sources. Near reionization's midpoint, the 21 cm power at $k \sim 0.1$ $h$Mpc$^{-1}$ is similarly reduced. These effects are more modest than the $30-60\%$ suppression resulting from the higher recombination rate if pressure smoothing is neglected entirely. Whether the sinks played a significant role in reionization's morphology depends on the nature of its sources. For example, if reionization was driven by bright ($M_{\rm UV} < -17$) galaxies, the sinks reduce the large-scale 21 cm power by at most $20\%$, even if pressure smoothing is neglected. Conveniently, when bright sources contribute significantly, the morphology in our dynamical treatment can be reproduced accurately with a uniform sub-grid clumping factor that yields the same ionizing photon budget. By contrast, if $M_{\rm UV} \sim -13$ galaxies drove reionization, the uniform clumping model can err by up to $40\%$.
description: 18 pages, 12 figures, accepted for publication in MNRAS
title: Robust adaptive least squares polynomial chaos expansions in high‐frequency applications
Creators: name: Loukrezis, Dimitrios
name: Galetzka, Armin
name: De Gersem, Herbert
Publisher: name: Wiley
Year: 2023

description: We present an algorithm for computing sparse, least squares‐based polynomial chaos expansions, incorporating both adaptive polynomial bases and sequential experimental designs. The algorithm is employed to approximate stochastic high‐frequency electromagnetic models in a black‐box way, in particular, given only a dataset of random parameter realizations and the corresponding observations regarding a quantity of interest, typically a scattering parameter. The construction of the polynomial basis is based on a greedy, adaptive, sensitivity‐related method. The sequential expansion of the experimental design employs different optimality criteria, with respect to the algebraic form of the least squares problem. We investigate how different conditions affect the robustness of the derived surrogate models, that is, how much the approximation accuracy varies given different experimental designs. It is found that relatively optimistic criteria perform on average better than stricter ones, yielding superior approximation accuracies for equal dataset sizes. However, the results of strict criteria are significantly more robust, as reduced variations regarding the approximation accuracy are obtained, over a range of experimental designs. Two criteria are proposed for a good accuracy‐robustness trade‐off.
Defect formation dynamics during CdTe overlayer growth
Creators: name: Chavez, J. J.
name: Ward, D. K.
name: Wong, B. M.
name: Doty, F. P.
name: Cruz-Campa, J. L.
name: Nielson, G. N.
name: Gupta, V. P.
name: Zubia, D.
name: McClure, J.
name: Zhou, X. W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The presence of atomic-scale defects at multilayer interfaces significantly degrades performance in CdTe-based photovoltaic technologies. The ability to accurately predict and understand defect formation mechanisms during overlayer growth is, therefore, a rational approach for improving the efficiencies of CdTe materials. In this work, we utilize a recently developed CdTe bond-order potential (BOP) to enable accurate molecular dynamics (MD) simulations for predicting defect formation during multilayer growth. A detailed comparison of our MD simulations to high-resolution transmission electron microscopy experiments verifies the accuracy and predictive power of our approach. Our simulations further indicate that island growth can reduce the lattice mismatch induced defects. These results highlight the use of predictive MD simulations to gain new insight on defect reduction in CdTe overlayers, which directly addresses efforts to improve these materials.
Quantum Grid States and Hybrid Graphs
Creators: name: Ghimire, Biswash
name: Wagner, Thomas
name: Kampermann, Hermann
name: Bruß, Dagmar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using the signed laplacian matrix, and weighted and hybrid graphs, we present additional ways to interpret graphs as grid states. Hybrid graphs offer the most general interpretation. Existing graphical methods that characterize entanglement properties of grid states are adapted to these interpretations. These additional classes of grid states are shown to exhibit rich entanglement properties, including bound entanglement. Further, we introduce graphical techniques to construct bound entangled states in a modular fashion. We also extend the grid states model to hypergraphs. Our work, on one hand, opens up possibilities for constructing additional families of mixed quantum states in the grid state model. On the other hand, it can serve as an instrument for investigating entanglement problems from a graph theory perspective.
description: 12 pages, 8 figures
Experimental quantum error correction with high fidelity
Creators: name: Zhang, Jingfu
name: Gangloff, Dorian
name: Moussa, Osama
name: Laflamme, Raymond
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: More than ten years ago a first step towards quantum error correction (QEC) was implemented [Phys. Rev. Lett. 81, 2152 (1998)]. The work showed there was sufficient control in nuclear magnetic resonance (NMR) to implement QEC, and demonstrated that the error rate changed from $ε$ to approximatively $\simε^2$. In the current work we reproduce a similar experiment using control techniques that have been since developed, such as GRAPE pulses. We show that the fidelity of the QEC gate sequence, and the comparative advantage of QEC are appreciably improved. This advantage is maintained despite the errors introduced by the additional operations needed to protect the quantum states.
RURAL RENAISSANCE: TRANSFORMING ZHAOQING'S PUBLIC SPACES FOR VIBRANT COMMUNITY LIFE
Creators: name: Dr. Ming Yang
Publisher: name: zap Journals
Year: 2023
Subjects: Rural revitalization
Public space
Rural development
Traditional spatial structure
Rural culture

description: The rural revitalization strategy, first introduced during the 19th National Congress of the Communist Party of China and reaffirmed during the subsequent two sessions in 2021, has emerged as a pivotal and historic initiative in the comprehensive development of a modern socialist nation. This underscores the government's commitment to the holistic rejuvenation and progress of rural regions. In this context, various policy interventions, including urbanization, the development of characteristic towns, and the rural revitalization program, have instigated profound transformations in the economic landscape, social fabric, and architectural structure of rural areas. Consequently, these changes have led to the abandonment of production-oriented public spaces, dispersion of life-oriented public spaces, ecological degradation, and an impact on traditional rural spatial structures and cultural characteristics, resulting in a gradual decline in rural public spaces.
This study employs Jiaoyuan Village in Zhaoqing City as a case study to explore the academic rationale behind rural revitalization and rural public spaces. It delves into the reconstruction of rural public spaces, focusing on aspects such as their value, function, and layout. By examining the transformation of Jiaoyuan Village, this research offers insights into the challenges and opportunities associated with rural revitalization efforts and highlights the significance of revitalizing rural public spaces as a means to promote sustainable development in China's countryside
Autoantibody reactivity with histone 5
Creators: name: Pauls, John David
Publisher: name: Medicine
Year: 1990
Subjects: subject: QR 186.82 P38 1990
subject: Autoantibodies
subject: Histones

description: Bibliography: p. 213-235.
description: The mechanisms responsible for the induction of the autoimmune state in juvenile rheumatoid arthritis (JRA), systemic lupus erythematosus (SLE) and drug-induced lupus (DIL) are poorly understood. One of the features of autoimmunity is the presence of antibodies that react with a variety of self-antigens including nuclear DNA and histone. In keeping with the concept that the autoimmune state is driven by autoantigens, it was hypothesized that autoantibodies from these three patient populations would not bind to the non-mammalian histone H5. The specificity of JRA sera for histone subclasses was examined by immunoblotting. Antibodies to Hl alone were found in 4 of 21 pauciarticular-onset JRA sera, 4 of 19 polyarticular-onset JRA sera, and 2 of 11 systemic-onset JRA sera. Antibodies to H5 alone were found in 1 of 21 pauciarticular JRA sera, 1 of 19 polyarticular JRA sera, and 3 of 11 systemic JRA sera. Antibodies to both Hl and H5 were found in 4 of 21 pauciarticular JRA sera, 4 of 19 polyarticular sera, and 1 of 11 systemic JRA sera. Only two sera reacted with the core histones. No reactivity to histones was observed in 30 sera from age-matched children with non-rheumatic disease. The presence of antibodies to H5 in some JRA patients, in conjunction with sequence similarity analysis, suggests that the immune response in these patients is directed to determinants that are not shared by sequences of mammalian proteins. In an analysis of other patient sera, 79/98 patients with SLE, 3/3 patients with hydralazine-induced lupus (HIL), and 4/4 patients with procainamide-induced lupus (PIL) bound to H5. Proteolytic digestion of H5 and subsequent immunoblotting of the resulting peptides with 9 SLE and 7 DIL sera, revealed binding to an antigenic determinant in the carboxyl terminus. Furthermore, while some H5 antibodies also bind to HI, adsorption and immunoblotting studies identified a population of antibodies that bind specifically to H5. As an approach to determining the linear epitopes on H5, a new solid-phase multi-pin peptide synthesis protocol was used. None of 8 SLE, 3 HIL or 2 PIL sera showed statistically significant reactivity with hexamers in the carboxy-terminus. Of interest, the peptides with the most reactivity were in the globular domain of H5. These observations suggest that the majority of H5 carboxy-terminal determinants observed in immunoblotting experiments are conformational epitopes. Furthermore, since no binding was found to the globular domain by immunoblotting, the linear epitopes in this domain may be unexposed in the native protein. These findings provide new insight into the epitopes on a non-mammalian protein (H5) and give additional information about the origin of autoantibodies in SLE, PIL and HIL.
Brevicornu verralli
Creators: name: El Mouden, Mohamed Amin
name: Chandler, Peter J.
name: Saidoun, Imane
name: Driauach, Ouafaa
name: Belqat, Boutaïna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Mycetophilidae
Brevicornu
Brevicornu verralli

description: Brevicornu verralli (Edwards, 1925)
Material examined.
Morocco – Middle Atlas Region • 17 ♂♂; Gouffre Izora; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2485 • 13 ♂♂; Grotte Bouslama; 19/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2486 • 3 ♂♂; Forêt Bab Boudir; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2484 • 1 ♂; Grotte Bouhayati; 20/V/2022; K. Aattouch, M. El Ouahabi and M. A. El Mouden leg; UAE-FST MA 22/2487.
North African distribution.
Tunisia (Chandler 1994) and Morocco (Banamar et al. 2020).
description: Published as part of El Mouden, Mohamed Amin, Chandler, Peter J., Saidoun, Imane, Driauach, Ouafaa & Belqat, Boutaïna, 2025, A new species of Docosia Winnertz, 1864 and new records of fungus gnats (Diptera, Bolitophilidae, Keroplatidae and Mycetophilidae) from North Africa, pp. 349-379 in ZooKeys 1233 on pages 349-379, DOI: 10.3897/zookeys.1233.130502
IRES: Nano-integrity in 3D printing
Creators: name: Vanessa Lislevand, Dimitris Karasavvas and Elias Koumoulos
Publisher: name: Zenodo
Year: 2023
Subjects: ontology
standard
data management
global workshop
ontology commons ecosystem
FAIR

description: IRES develops a serires of filed measurements to characterize airborne particle number nitrationation (PNC) from Additive Manufacturing (AM) activities. Tits goal is to develop an ontology describing the domain expertise involved and create a triple store databased based on the developed ontology with the data collected during the use case.
Life and works of Vincent Misonne
Creators: name: Jacques, Julie Patricia, 1954-
Publisher: name: Arts
Year: 1983
Subjects: subject: ML 410 M7 J32 1983
subject: Misonne, Vincent, ca. 1490-1550
subject: Composers - France - Biography
subject: Misonne, Vincent, ca. 1490-1550 - Thematic catalogues
subject: Sacred vocal music

description: Bibliography: p. 119-127.
Singular spinors as expansion coefficients of local spin-half fermionic and bosonic fields: On the two-fold Wigner degeneracy
Creators: name: Rogerio, R. J. Bueno
name: Villalobos, C. H. Coronado
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: By scrutinizing the singular sector of the Lounesto spinor classification, we investigate the correct definition of the expansion coefficient functions of local fermionic fields within a fully Lorentz covariant theory. As we can observe, a careful definition of the adjoint structure, directed towards local fields, maps singular spinors into class-2 according to a general spinor classification. Furthermore, we investigate all the necessary mathematical tools for constructing local fermionic and bosonic fields and provide insights into the physical implications for the other singular classes. Besides, we also show that incorporating \emph{Wigner degeneracy} maintains the rotational symmetry formalism working in general.
description: 14 pages
On quaternary complex Hadamard matrices of small orders
Creators: name: Szöllősi, Ferenc
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05B20, 46L10

description: One of the main goals of design theory is to classify, characterize and count various combinatorial objects with some prescribed properties. In most cases, however, one quickly encounters a combinatorial explosion and even if the complete enumeration of the objects is possible, there is no apparent way how to study them in details, store them efficiently, or generate a particular one rapidly. In this paper we propose a novel method to deal with these difficulties, and illustrate it by presenting the classification of quaternary complex Hadamard matrices up to order 8. The obtained matrices are members of only a handful of parametric families, and each inequivalent matrix, up to transposition, can be identified through its fingerprint.
description: 7 pages
Top quark mass measurements at the $t\bar{t}$ threshold with CEPC
Creators: name: Li, Zhan
name: Sun, Xiaohu
name: Fang, Yaquan
name: Li, Gang
name: Xin, Shuiting
name: Wang, Shudong
name: Wang, Yiwei
name: Zhang, Yuan
name: Zhang, Hao
name: Liang, Zhijun
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a study of top quark mass measurements at the $t\bar{t}$ threshold based on CEPC. A centre-of-mass energy scan near two times of the top mass is performed and the measurement precision of top quark mass, width and $α_S$ are evaluated using the $t\bar{t}$ production rates. Realistic scan strategies at the threshold are discussed to maximise the sensitivity to the measurement of the top quark properties individually and simultaneously in the CEPC scenarios assuming a limited total luminosity of 100 fb$^{-1}$. With the optimal scan for individual property measurements, the top quark mass precision is expected to be 9 MeV, the top quark width precision is expected to be 26 MeV, and $α_S$ can be measured at a precision of 0.00039. Taking into account the uncertainties from theory, background subtraction, beam energy and luminosity spectrum, the top quark mass can be measured at a precision of 14 MeV optimistically and 34 MeV conservatively at CEPC.
Flipping the Winner of a Poset Game
Creators: name: Kalinich, Adam O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: FOS: Computer and information sciences

description: Partially-ordered set games, also called poset games, are a class of two-player combinatorial games. The playing field consists of a set of elements, some of which are greater than other elements. Two players take turns removing an element and all elements greater than it, and whoever takes the last element wins. Examples of poset games include Nim and Chomp. We investigate the complexity of computing which player of a poset game has a winning strategy. We give an inductive procedure that modifies poset games to change the nim- value which informally captures the winning strategies in the game. For a generic poset game G, we describe an efficient method for constructing a game not G such that the first player has a winning strategy if and only if the second player has a winning strategy on G. This solves the long-standing problem of whether this construction can be done efficiently. This construction also allows us to reduce the class of Boolean formulas to poset games, establishing a lower bound on the complexity of poset games.
Robust feature selection for large scale image retrieval
Creators: name: Turcot, Panu James
Publisher: name: University of British Columbia
Year: 2010

description: This paper addresses the problem of recognizing specific objects in very large datasets. A common approach has been based on the bag-of-words (BOW) method, in which local image features are clustered into visual words, providing memory savings through feature quantization. In this paper we take an additional step to reducing memory requirements by selecting only a small subset of the training features to use for recognition. This approach, which we name Robust Feature Selection (RFS), is based on the observation that many local features are unreliable or represent irrelevant clutter. We are able to select “maximally robust” features by an unsupervised preprocessing step that identifies correctly matching features among the training images. We demonstrate that this selection approach allows an average of 4% of the original features per image to provide matching performance that is as accurate as the full set in the Oxford Buildings dataset. In addition, we employ a graph to represent the matching relationships between images. Doing so enables us to effectively augment the feature set for each image by merging them with maximally robust features from neighbouring images. We demonstrate adjacent and 2-adjacent augmentation, both of which give a substantial boost in recognition performance.
Regulator napona sistema pobude sinhronog generatora tipa INT-EXT-BL 15
Creators: name: Stojić, Đorđe
name: Milojčić, Nemanja
Publisher: name: Zenodo
Year: 2023

description: Tehničko rešenje se sastoji od novog proizvoda primenjenog na nacionalnom nivou – tranzistorskog sistema pobude sa primenom u generatorima sa budilicom i obrtnom beskontaktnom pobudom. Inovativna rešenja koja su primenjena u proizvodu sastoje se od nove hardversko-softverske platforme, bazirane na 32-bitnom mikrokontroleru sa aritmetikom sa nepokretnim zarezom, tranzistorskim modulom za spuštanje napona (engl. buck) i pratećom merno-upravljačkom elektronikom i pasivnim elementima koji omogućavaju rad uređaja u opsegu nominalnih struja pobude od 15 A i napona pobude od 60V, sa kratkotrajnom strujom forsiranja od 30 A i napona pobude od 120 V. Primena nove hardverske upravljačke platforme omogućava implementaciju bržeg i pouzdanijeg upravljačkog softvera, sa mogućnošću realizacije najmodernijih upravljačkih algoritama. Poseban značaj predloženog rešenja sastoji se u njegovoj veoma širokoj primeni u različitim industrijskim postrojenjima, sa posebnim akcentom na primeni u objektima malih hidroelektrana, u kojoj generatori sa beskontaktnom pobudom (brašles generator) predstavljaju jedno od standardnih rešenja.
title: Transverse energy flow in an optical Skyrmionic Hopfion
Creators: name: Droop, Ramon
name: Ehrmanntraut, Daniel
name: Denz, Cornelia
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 535 Light and related radiation

description: The energy flow of light represents a natural way of investigating complex light fields with respect to their applicability. With the generation of a three-dimensional Skyrmionic Hopfion structure in light, which is a topological 3D field configuration with particle-like nature, we paved the way to employ optical, topological constructs. In this work, we present an analysis of the transverse energy flow in the optical Skyrmionic Hopfion, showing the transfer of the topological properties to the mechanical attributes such as the optical angular momentum (OAM). Our findings thus prepare topological structures to be applied in optical traps and data storage or communication.
description: Finanziert durch den Open-Access-Publikationsfonds der Universität Münster.
Monotonicity of Ursell functions in the Ising model
Creators: name: Camia, Federico
name: Jiang, Jianping
name: Newman, Charles M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, we consider Ising models with ferromagnetic pair interactions. We prove that the Ursell functions $u_{2k}$ satisfy: $(-1)^{k-1}u_{2k}$ is increasing in each interaction. As an application, we prove a 1983 conjecture by Nishimori and Griffiths about the partition function of the Ising model with complex external field $h$: its closest zero to the origin (in the variable $h$) moves towards the origin as an arbitrary interaction increases.
description: 22 pages, 10 figures; to appear in CMP
New classes of nonlinearly self-adjoint evolution equations of third- and fifth-order
Creators: name: Freire, Igor Leite
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In a recent communication Nail Ibragimov introduced the concept of nonlinearly self-adjoint differential equation [N. H. Ibragimov, Nonlinear self-adjointness and conservation laws, J. Phys. A: Math. Theor., vol. 44, 432002, 8 pp., (2011)]. In the present communication a nonlinear self-adjoint classification of a general class of fifth-order evolution equation with time dependent coefficients is presented. As a result five subclasses of nonlinearly self-adjoint equations of fifth-order and four subclasses of nonlinearly self-adjoint equations of third-order are obtained. From the Ibragimov's theorem on conservation laws [N. H. Ibragimov, A new conservation theorem, J. Math. Anal. Appl., vol. 333, 311--328, (2007)] conservation laws for some of these equations are established.
Boundary diffraction wave integrals for diffraction modeling of external occulters
Creators: name: Cady, E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: An occulter is a large diffracting screen which may be flown in conjunction with a telescope to image extrasolar planets. The edge is shaped to minimize the diffracted light in a region beyond the occulter, and a telescope may be placed in this dark shadow to view an extrasolar system with the starlight removed. Errors in position, orientation, and shape of the occulter will diffract additional light into this region, and a challenge of modeling an occulter system is to accurately and quickly model these effects. We present a fast method for the calculation of electric fields following an occulter, based on the concept of the boundary diffraction wave: the 2D structure of the occulter is reduced to a 1D edge integral which directly incorporates the occulter shape, and which can be easily adjusted to include changes in occulter position and shape, as well as the effects of sources---such as exoplanets---which arrive off-axis to the occulter. The structure of a typical implementation of the algorithm is included.
description: 13 pages, 5 figures
Parallelization techniques for quantum simulation of fermionic systems
Creators: name: Bringewatt, Jacob
name: Davoudi, Zohreh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Mapping fermionic operators to qubit operators is an essential step for simulating fermionic systems on a quantum computer. We investigate how the choice of such a mapping interacts with the underlying qubit connectivity of the quantum processor to enable (or impede) parallelization of the resulting Hamiltonian-simulation algorithm. It is shown that this problem can be mapped to a path coloring problem on a graph constructed from the particular choice of encoding fermions onto qubits and the fermionic interactions onto paths. The basic version of this problem is called the weak coloring problem. Taking into account the fine-grained details of the mapping yields what is called the strong coloring problem, which leads to improved parallelization performance. A variety of illustrative analytical and numerical examples are presented to demonstrate the amount of improvement for both weak and strong coloring-based parallelizations. Our results are particularly important for implementation on near-term quantum processors where minimizing circuit depth is necessary for algorithmic feasibility.
description: 27 pages, 12 figures; (v2) corrected a misplaced figure; (v3) updated for publication with minor changes
The english language folk and traditional songs of Alberta: collection and analysis for teaching purposes
Creators: name: Pauls, Leonora Mary
Publisher: name: Arts
Year: 1981
Subjects: subject: M 1678 P36 1983
subject: Folk-songs, English - Alberta

description: Bibliography: p. 284-288.
description: The purposes of this study were to find English language folk and traditional songs which were passed on in oral tradition in Alberta before 1945; to analyze them according to Kodaly principles; and to demonstrate their use in meeting the objectives of the elementary school music program. The collection of data included both primary and secondary sources obtained through field work and library research. A few Alberta songs were located in published sources, but no major collection was found. It was necessary to engage in field work to determine whether or not there would be enough songs to compile a collection suitable for use in the schools. Four hundred and fifty-nine songs were collected and recorded, not all of them appropriate for this purpose. The songs selected for transcription and inclusion were those that had been passed on in oral transmission before 1945 and were considered relevant, appropriate, and applicable for educational purposes. It is hoped that this collection of songs will provide Alberta children with musical material that is their own, will reflect Alberta's musical traditions, and will be a valuable contribution to the documentation of folklore in Alberta. The major conclusions are: that although there are a few Alberta songs in other published sources, no major collection exists ; that songs, traditional and folk, have been and still are circulating in oral tradition in Alberta; that there are a number of songs with locally significant lyrics and a number of variants that may be unique to Alberta; that as a result of the analyses of the songs' musical characteristics and an examination of the texts, many songs are deemed suitable for teaching purposes, and can be used effectively with elementary children.
Time and alienation in Rousseau
Creators: name: Sackeroff, Roy S.
Publisher: name: Arts
Year: 1971
Subjects: subject: PQ 2056 T4 S22 1971
subject: Rousseau, Jean Jacques, 1712-1778

description: Bibliography: p. 98-99.
description: This essay is primarily concerned with demonstrating Jean-Jacques Rousseau’s personal and political struggle against the particularizing, limiting measure of time. That Rousseau's autobiographical and literary writings reveal a lament and rebellion against time is not a new insight but we will extend this line of inquiry into Rousseau's theoretical political work. There woven in more subtle threads, we find the same unifying priority: an attempt to defeat time and to grant man—either in the immediacy of the moment of self-alienation or in the pure abstractness of the General Will— eternality.
Axions, WIMPs, proton decay and observable $r$ in $SO(10)$
Creators: name: Okada, Nobuchika
name: Raut, Digesh
name: Shafi, Qaisar
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore some experimentally testable predictions of an $SO(10)$ axion model which includes two 10-plets of fermions in order to resolve the axion domain wall problem. The axion symmetry can be safely broken after inflation, so that the isocurvature perturbations associated with the axion field are negligibly small. An unbroken gauge $Z_2$ symmetry in $SO(10)$ ensures the presence of a stable WIMP-like dark matter, a linear combination of the electroweak doublets in the fermion 10-plets and an $SO(10)$ singlet fermion with mass $\sim 62.5 \; {\rm GeV}\; (1 \; {\rm TeV}) $ when it is mostly the singlet (doublet) fermion, that co-exists with axion dark matter. We also discuss gauge coupling unification, proton decay, inflation with non-minimal coupling to gravity and leptogenesis. With the identification of the SM singlet Higgs field in the $126$ representation of $SO(10)$ as inflaton, the magnetic monopoles are inflated away, and we find $0.963 \lesssim n_s \lesssim 0.965$ and $0.003 \lesssim r \lesssim 0.036$, where $n_s$ and $r$ denote the scalar spectral index and tensor-to-scalar ratio, respectively. These predictions can be tested in future experiments such as CMB-S4.
description: 21 pages, 6 figures
Four-Derivative Brane Couplings from String Amplitudes
Creators: name: Becker, Katrin
name: Guo, Guangyu
name: Robbins, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We evaluate the string theory disc amplitude of one Ramond-Ramond field C^(p-3) and two Neveu-Schwarz B-fields in the presence of a single Dp-brane in type II string theory. From this amplitude we extract the four-derivative (or equivalently order (alpha')^2) part of the Dp-brane action involving these fields. We show that the new couplings are invariant under R-R and NS-NS gauge transformations and compatible with linear T-duality.
description: 31 pages, 7 figures
Engineering Aggregation Operators for Relational In-Memory Database Systems
Creators: name: Müller, Ingo
Publisher: name: Karlsruhe
Year: 2016
Subjects: database systems
query processing
aggregation
algorithm engineering
cache-efficiency

description: In this thesis we study the design and implementation of Aggregation operators in the context of relational in-memory database systems. In particular, we identify and address the following challenges: cache-efficiency, CPU-friendliness, parallelism within and across processors, robust handling of skewed data, adaptive processing, processing with constrained memory, and integration with modern database architectures. Our resulting algorithm outperforms the state-of-the-art by up to 3.7x.
On comeager sets of metrics whose ranges are disconnected
Creators: name: Ishiki, Yoshito
Publisher: name: arXiv
Year: 2022
Subjects: subject: Metric Geometry (math.MG)
subject: General Topology (math.GN)
subject: FOS: Mathematics

description: For a metrizable space $X$, we denote by $\mathrm{Met}(X)$ the space of all metric that generate the same topology of $X$. The space $\mathrm{Met}(X)$ is equipped with the supremum distance. In this paper, for every strongly zero-dimensional metrizable space $X$, we prove that the set of all metrics whose ranges are closed totally disconnected subsets of the line is a dense $G_δ$ subspace in $\mathrm{Met}(X)$. As its application, we show that some sets of universal metrics are meager in spaces of metrics.
description: 13 pages. This paper is published in Topology and its Applications vol.327 (2023), 108442
The expanded Maxwell's equations for a mechano-driven media system that moves with acceleration
Creators: name: Wang, Zhong Lin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In classical electrodynamics, by motion for either the observer or the media, it always naturally assumed that the relative moving velocity is a constant along a straight line (e.g., in inertia reference frame), so that the electromagnetic behavior of charged particles in vacuum space can be easily described using special relativity. However, for engineering applications, the media have shapes and sizes and may move with acceleration, and recent experimental progresses in triboelectric nanogenerators have revealed evidences for expanding the Maxwell's equations to include media motion that could be time and even space dependent. Therefore, we have developed the expanded Maxwell's equations for a mechano-driven media system (MEs-f-MDMS) by neglecting relativistic effect. This article first presents the updated progresses made in the field. Secondly, we extensively investigated the Faraday's law of electromagnetic induction for a media system that moves with an acceleration. We concluded that, the newly developed MEs-f-MDMS are required for describing the electrodynamics inside a media that has a finite size and volume and move with and even without acceleration. The classical Maxwell's equations are to describe the electrodynamics in vacuum space when the media in the nearby are moving.
description: 35 pages,8 figures
title: Dealing with nationalism in view of a human need to belong: the feasibility of narrative transformation in Northern Ireland
Creators: name: Englberger, Florian
Publisher: name: University of St Andrews
Year: 2018

description: This thesis seeks to delineate what change in divided societies such as Northern Ireland is possible. Two steps are necessary to answer this question: first, to explain the potency of nationalism. I contend that taking the evolutionary history of humans and a human need to belong into account is essential for an understanding of A.D. Smith’s ethno-symbolist approach to nationalism. We need to acknowledge that human beings emerged from small-scale settings and are therefore conservative beings who seek those patterns of familiarity that make up the ordinary ‘everyday’. They are also prejudiced beings, as prejudice helps to break down a complex world into digestible pieces. The ethnic state excluding an ethnic ‘other’ is an answer to these calls for simplicity. By establishing an apparent terra firma, a habitus, symbols of an ethnic past and national present speak of nationalist narratives that provide a sense of ontological security. In (Northern) Ireland, ethno-national communities based on prejudiced understandings of history have long been established. In this second step I maintain that change that violates the core potent national narratives cannot be achieved. The Provisional IRA’s change from insurrection to parliament became feasible because a radical break with republican dogmas was avoided. Sinn Féin, despite a rhetorical move towards ‘reconciliation’, still seek to outmanoeuvre the unionist ‘other’. The history of Irish socialism, on the other hand, has been a failure, as it embodied a radical attempt to banish the ‘other’ from the national narrative. Regarding ‘post-conflict’ Northern Ireland, I argue for a peacebuilding approach that leaves the confinements of hostile identity politics, as these mass guarantors of ontological security possess only limited potential for relationship transformation. We need to appreciate those almost invisible acts of empathy and peace that could be found even in Northern Ireland’s darkest hours.
Analysis of melting and flow in the hot-end of a material extrusion 3D printer using X-ray computed tomography
Creators: name: Kattinger, Julian
name: Kornely, Mike
name: Ehrler, Julian
name: Bonten, Christian
name: Kreutzbruck, Marc
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This paper presents in-situ X-ray computed tomography (CT) experiments used to study the flow behavior within a conventional hot-end of a fused filament fabrication printer. Three types of experiments were performed to better understand the melt and flow behavior. In one experiment, 360° CT scans were conducted, focusing on the air gap between the filament and the nozzle wall. In a second experiment, the flow profile inside the nozzle was studied using radiography. To provide a good contrast to the surrounding nozzle material, filament was prepared containing small amounts of tungsten powder as a contrast agent. During a third test, the extruder forces were measured and compared with the X-ray results and the predictions of a numerical simulation. The CT scans showed that at higher filament speeds, less area of the nozzle wall is in contact with the melt. This means that a larger part of the barrel section is occupied by an air gap between the solid filament and the nozzle wall. In contrast to the filament speed, the influence of the heater temperature shows no discernible effect on the part of the nozzle filled with melt. Radiographic evaluation of the velocity profile revealed a parabolic distribution under the studied conditions, closely matching numerical simulations modeling the flow as isothermal and non-Newtonian. The study's findings offer potential for improving nozzle design. Furthermore, the presented experimental method can serve as a valuable tool for future validation of more complex numerical simulations.