cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Studies of Spin Effects in Charged Higgs Boson Production with an Iterative Discriminant Analysis at the Tevatron and LHC
Creators: name: Hesselbach, S.
name: Moretti, S.
name: Rathsman, J.
name: Sopczak, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We report on detailed Monte Carlo comparisons of selection variables to separate tbH+ signal events from the Standard Model ttbar background using an Iterative Discriminant Analysis (IDA) method. While kinematic differences exist between the two processes whenever m(H+).ne.m(W+), the exploration of the spin difference between the charged Higgs and the W+ gauge boson becomes crucial in the particularly challenging case of near degeneracy of the charged Higgs boson mass with the W+ mass. The TAUOLA package is used to decay the tau leptons emerging from the charged Higgs and W+ boson decays taking the spin difference properly into account. We demonstrate that, even if the individual selection variables have limited discriminant power, the IDA method achieves a significant separation between the expected signal and background. For both Tevatron and LHC energies, the impact of the spin effects and H+ mass on the separation of signal and background has been studied quantitatively. The effect of a hard transverse momentum cut to remove QCD background has been studied and it is found that the spin effects remain important. The separation is expressed in purity versus efficiency curves. The study is performed for charged Higgs boson masses between the W+ mass and near the top mass.
description: 19 pages, 21 figures; updated title for EPJC
Like-charge attraction at short distances in a charge-asymmetric two-dimensional two-component plasma: Exact results
Creators: name: Varela, Lucas
name: Téllez, Gabriel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We determine exactly the short-distance effective potential between two "guest" charges immersed in a two-dimensional two-component charge-asymmetric plasma composed of positively ($q_1 = +1$) and negatively ($q_2 = -1/2$) charged point particles. The result is valid over the whole regime of stability, where the Coulombic coupling (dimensionless inverse temperature) $β<4$. At high Coulombic coupling $β>2$, this model features like-charge attraction. Also, there cannot be repulsion between opposite-charges at short-distances, at variance with large-distance interactions.
Influence of the environment and probes on rapid DNA sequencing via transverse electronic transport
Creators: name: Lagerqvist, Johan
name: Zwolak, Michael
name: Di Ventra, Massimiliano
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study theoretically the feasibility of using transverse electronic transport within a nanopore for rapid DNA sequencing. Specifically, we examine the effects of the environment and detection probes on the distinguishability of the DNA bases. We find that the intrinsic measurement bandwidth of the electrodes helps the detection of single bases by averaging over the current distributions of each base. We also find that although the overall magnitude of the current may change dramatically with different detection conditions, the intrinsic distinguishability of the bases is not significantly affected by pore size and transverse field strength. The latter is the result of very effective stabilization of the DNA by the transverse field induced by the probes, so long as that field is much larger than the field that drives DNA through the pore. In addition, the ions and water together effectively screen the charge on the nucleotides, so that the electron states participating in the transport properties of the latter ones resemble those of the uncharged species. Finally, water in the environment has negligible direct influence on the transverse electrical current.
description: 14 pages, 5 figures
Enhanced electron-phonon coupling in doubly aligned hexagonal boron nitride bilayer graphene heterostructure
Creators: name: Kuiri, Manabendra
name: Srivastav, Saurabh Kumar
name: Ray, Sujay
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Das, Tanmoy
name: Das, Anindya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The relative twist angle in heterostructures of two-dimensional (2D) materials with similar lattice constants result in a dramatic alteration of the electronic properties. Here, we investigate the electrical and magnetotransport properties in bilayer graphene (BLG) encapsulated between two hexagonal boron nitride (hBN) crystals, where the top and bottom hBN are rotationally aligned with bilayer graphene with a twist angle $θ_t\sim 0^{\circ} \text{and}~ θ_b < 1^{\circ}$, respectively. This results in the formation of two moiré superlattices, with the appearance of satellite resistivity peaks at carrier densities $n_{s1}$ and $n_{s2}$, in both hole and electron doped regions, together with the resistivity peak at zero carrier density. Furthermore, we measure the temperature(T) dependence of the resistivity ($ρ$). The resistivity shows a linear increment with temperature within the range 10K to 50K for the density regime $n_{s1}
Φαινομενολογία του ασυνειδήτου: το παράδειγμα του Λακανικού πεδίου
Creators: name: Μήτρου, Ιωάννης Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Φαινομενολογία
Ψυχανάλυση
Συμβάν
Ασυνείδητο
Phenomenology
Psychoanalysis
Event
Unconscious

description: Σκοπός αυτής της εργασίας είναι να εστιάσει στη σχέση μεταξύ της ψυχανάλυσης και της φιλοσοφίας μέσω της φαινομενολογικής προσέγγισης του ασυνειδήτου. Η εργασία πραγματεύεται τα τέσσερα συμβάντα τα οποία ενεργοποιούν την φιλοσοφία ως προς τις αλήθειες, σύμφωνα με τον A. Badiou: το Ποιητικό (τέχνη), το Πολιτικό, ο Έρως (ψυχανάλυση) και το Μαθήμιο (η επιστήμη). Ιδιαίτερη έμφαση δίνεται στην φαινομενολογία της γλώσσας του N. Merleau-Ponty καθώς και στην φιλοσοφική αντίληψή του για την έννοια του σώματος και της σωματικότητας του υποκειμένου. Η σύνδεση με την ψυχανάλυση πραγματοποιείται κυρίως μέσω της μελέτης του λακανικού πεδίου προσεγγίζοντας το φαινόμενο της τέχνης και του πολιτικού μέσα από το υποκείμενο του ασυνειδήτου. Το κλινικό μέρος της εργασίας πλαισιώνει τη συνολική μελέτη. Η φαινομενολογία του ασυνειδήτου πηγάζει από την χουσερλιανή φαινομενολογία ενώ συνδέεται άμεσα με την φαινομενολoγία του ενδιάμεσου του M. Merleau-Ponty. Μια τέτοια φαινομενολογία ερευνά την φροϋδική ανακάλυψη του ασυνειδήτου θέτοντας νέα θεμέλια για τη συνείδηση και το φαινομενολογικό cogito.
description: The aim of this work is to highlight the relationship between psychoanalysis and philosophy through the phenomenological approach of the unconscious. We study the four events that trigger philosophy as to the truth, according to A. Badiou: Poetry (art), Political, Eros (psychoanalysis) and Matheme (science). Emphasis is given on the phenomenology of M. Merleau-Ponty's language structure and on his philosophical perception of the body concept and the subject's corporality. The connection to the psychoanalysis is succeeded mainly through the study of the lacanian field, approaching the phenomenon of Art and Politics through the subject of the unconscious. There is a clinical part in the work that frames the overall study. The phenomenology of the unconscious emanates from the Husserlian phenomenology and is directly related to the phenomenology of M.Merleau-Ponty's intermediate. Such a phenomenology research investigates the freudian discovery of the unconscious setting new foundations for consciousness and phenomenological cogito.
Criticality of a classical dimer model on the triangular lattice
Creators: name: Trousselet, F.
name: Pujol, P.
name: Alet, F.
name: Poilblanc, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a classical interacting dimer model which interpolates between the square lattice case and the triangular lattice case by tuning a chemical potential in the diagonal bonds. The interaction energy simply corresponds to the number of plaquettes with parallel dimers. Using transfer matrix calculations, we find in the anisotropic triangular case a succession of different physical phases as the interaction strength is increased: a short range disordered liquid dimer phase at low interactions, then a critical phase similar to the one found for the square lattice, and finally a transition to an ordered columnar phase for large interactions. The existence of the critical phase is in contrast with the belief that criticality for dimer models is ascribed to bipartiteness. For the isotropic triangular case, we have indications that the system undergoes a first order phase transition to an ordered phase, without appearance of an intermediate critical phase.
description: 12 pages, 16 figures
Influence of portal vein occlusion on portal flow and liver elasticity in an animal model
Creators: name: Chatelin, Simon
name: Pop, Raoul
name: Giraudeau, Céline
name: Ambarki, Khalid
name: Jin, Ning
name: Severac, François
name: Breton, Elodie
name: Vappou, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Hepatic fibrosis causes an increase in liver stiffness, a parameter measured by elastography and widely used as a diagnosis method. The concomitant presence of portal vein thrombosis (PVT) implies a change in hepatic portal inflow that could also affect liver elasticity. The main objective of this study is to determine the extent to which the presence of portal occlusion can affect the mechanical properties of the liver and potentially lead to misdiagnosis of fibrosis and hepatic cirrhosis by elastography. Portal vein occlusion was generated by insertion and inflation of a balloon catheter in the portal vein of four swines. The portal flow parameters peak flow (PF) and peak velocity magnitude (PVM) and liver mechanical properties (shear modulus) were then investigated using 4D-flow MRI and MR elastography, respectively, for progressive obstructions of the portal vein. Experimental results indicate that the reduction of the intrahepatic venous blood flow (PF/PVM decreases of 29.3%/8.5%, 51.0%/32.3% and 83.3%/53.6%, respectively) measured with 50%, 80% and 100% obstruction of the portal vein section results in a decrease of liver stiffness by $0.8\%\pm0.1\%$, $7.7\%\pm0.4\%$ and $12.3\%\pm0.9\%$, respectively. While this vascular mechanism does not have sufficient influence on the elasticity of the liver to modify the diagnosis of severe fibrosis or cirrhosis (F4 METAVIR grade), it may be sufficient to attenuate the increase in stiffness due to moderate fibrosis (F2-F3 METAVIR grades) and consequently lead to false-negative diagnoses with elastography in the presence of PVT.
Datos abiertos como soporte de políticas públicas e intervenciones urbanas
Creators: name: Salinas, Carlos
Publisher: name: Zenodo
Year: 2017
Subjects: Mobility
Bike sharing
Open Data
World Bike Forum
Foro Mundial de la Bicicleta
Datos abiertos
Movilidad
Ecobici

description: El autor analiza el potencial del uso de Datos Abiertos ciclistas como elemento de sustento a la toma de decisiones en materia de políticas públicas e intervenciones urbanas para fomentar dicho tipo de movilidad. La ponencia realiza una aplicación práctica del uso de Datos Abiertos analizando la información del sistema Ecobici de la Ciudad de México. La metodología consiste en la generación de distintos mapas que muestran el origen y destino de los usuarios con base en una matriz que retoma el promedio de todos los desplazamientos entre cicloestaciones realizados a lo largo del 2016. Los resultados obtenidos son interpretados retomando el marco teórico construido por varios autores que han estudiado la influencia de los aspectos físicos del espacio urbano sobre la dinámica social de las ciudades. De tal suerte, a los datos de desplazamientos obtenidos se sobrepusieron distintos mapeos en materia de transporte público, infraestructura ciclista existente, vías de acceso controlado y morfología urbana. Como resultado de dichos análisis se identifican 5 dinámicas socioespaciales características en la zona de operación del Sistema Ecobici. De cada una de ella se realiza una caracterización general y se proponen estrategias generales de intervención.
Development of traumatic brain injury therapeutics
Creators: name: Omelchenko, Anton
Publisher: name: No Publisher Supplied
Year: 2021

description: Traumatic brain injury (TBI) is one of the leading causes of death and disability in the world, and there are currently no available therapies to treat TBI-induced cell damage or to prevent TBI-associated cognitive impairments after injury. Diffuse axonal injury (DAI), a common TBI pathology, results from the shear and stretch of neuronal axons by the inertial forces of rotational head motions during TBI. Disruptions in sodium (Na+) and calcium (Ca2+) ion homeostasis significantly contribute to TBI and DAI pathogenesis. This dissertation will explore potential strategies for the development of TBI and DAI therapeutics targeting rising Ca2+ influx and mitochondrial dysfunction post-TBI. We examined target protein expression after injury in an in vivo controlled cortical impact (CCI) model of mild TBI (mTBI), and found alterations in expression of NCX1, the ubiquitously expressed sodium–calcium exchanger, and dynamin-related protein1 (Drp1), a GTPase regulator of mitochondrial fission, in the cortex and hippocampus following mTBI. We also demonstrate that pharmacological inhibition of NCX1 by SN-6 and of dynamin1, dynamin2, and Drp1 by dynasore attenuate stretch injury-induced swelling of axonal varicosities and mitochondrial fragmentation in an in vitro model of DAI. Moreover, using a hippocampal organotypic slice model of oxidative stress, we show that dynasore, but not SN-6, provides neuroprotection from H2O2-induced oxidative stress and cell death. In addition to pharmacological manipulation, we also investigate the use of brain-targeted exosomes, or nano-sized extracellular vesicles, to deliver short interfering RNA (siRNA) as a potential approach for the development of TBI therapeutics. Exosomes can be targeted to the central nervous system (CNS) by expression of a fusion protein, comprised of the CNS-specific rabies viral glycoprotein (RVG) and Lamp2b, a membrane protein expressed in exosomes, in exosome producing cells. We demonstrate that that RVG-exosomes loaded with siRNA via electroporation can deliver fluorescently-labeled siRNA to cultured primary dissociated neurons and to cells within cultured hippocampal organotypic slices. Furthermore, we present data to support that RVG-exosomes loaded with siRNA targeting NCX1 significantly downregulate NCX1 expression in vitro, and that NCX1 knockdown with siRNA-loaded RVG-exosomes attenuates mitochondrial depolarization following NMDA-mediated excitotoxicity. Taken together, the data presented in this dissertation highlight the potential of NCX1 and Drp1 as targets for TBI therapeutics, and underscore the potential of RVG-exosome-RNAi delivery as a promising approach for future development of TBI therapeutics.
The computation of the classes of some tori in the Grothendieck ring of varieties
Creators: name: Rökaeus, Karl
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14L10, 14G27, 14M20, 11G25

description: We establish a formula for the classes of certain tori in the Grothendieck ring of varieties, in terms of its lambda-structure. More explicitly, we will see that if L* is the torus of invertible elements in the n-dimensional separable k-algebra L, then the class of L* can be expressed as an alternating sum of the images of the spectrum of L under the lambda-operations, multiplied by powers of the Lefschetz class. This formula is suggested from the cohomology of the torus, illustrating a heuristic method that can be used in other situations. To prove the formula will require some rather explicit calculations in the Grothendieck ring. To be able to make these we introduce a homomorphism from the Burnside ring of the absolute Galois group of k, to the Grothendieck ring of varieties over k. In the process we obtain some information about the structure of the subring generated by zero-dimensional varieties.
description: 17 pages. v3: Corrected an error in 4.3, added Example 2.3 and Remark 4.4
Wikidata and Scholarly Communication
Creators: name: Panigabutra-Roberts, Anchalee
Publisher: name: Zenodo
Year: 2019
Subjects: Wikidata
Scholarly communication
Researchers identifiers

description: An invited presentation at the OCLC Linked Data Roundtable session at the American Library Association Annual Conference in Washington, D.C., June 22, 2019. This presentation is on Wikidata and scholarly communication.

Outline:

•Profiles for Scholarly Publications and Creative Works in Wikidata

•A Use Case for Anchalee Panigabutra-Roberts (Q62393357)

•Wikidata Tools and Query Service

•Access to Book Chapters and Articles in Conference Proceedings

in Bibliographic Records

•A Case Study of American University in Cairo and major findings

•Recommended Workflow and Enhanced Access to Book Chapters and Articles in Conference Proceedings

•Wikidata as an Alternative to Provide Access to Book Chapters and Articles in Conference Proceedings

•Wikidata as a Community-building Tool
International Business Strategy- Rovio entertainments ( Live Case Study)
Creators: name: KARTHIK LAKSHMI NARAYAN
Publisher: name: figshare
Year: 2021
Subjects: subject: 159999 Commerce, Management, Tourism and Services not elsewhere classified
subject: FOS: Economics and business

description: In this report we would examine with the contextual investigation of Rovio entertainment and distinguishing the 4 worldwide megatrends by breaking down their potential effects on rovio diversion vital position, here we would likewise dissect the chances and dangers related with it. Furthermore, in this report, you can perceive how the focal points and inconveniences with biological systems in both Finland and Japan as the command posts for a worldwide gaming mammoth.
Additional file 1 of Elevated blood urea nitrogen is associated with recurrence of post-operative chronic subdural hematoma
Creators: name: Wang, Ning
name: Hu, Jiangnan
name: Oppong-Gyebi, Anthony
name: Zhu, Xuanhao
name: Li, Yihao
name: Yang, Jianjing
name: Ruan, Linhui
name: Zhuge, Qichuan
name: Ye, Sheng
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified

description: Additional file 1. Supplemental table of multivariate analyzed association between preoperative BUN and Recurrence.
Site Percolation on Planar $Φ^{3}$ Random Graphs
Creators: name: Kownacki, J. -P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In this paper, site percolation on random $Φ^{3}$ planar graphs is studied by Monte-Carlo numerical techniques. The method consists in randomly removing a fraction $q=1-p$ of vertices from graphs generated by Monte-Carlo simulations, where $p$ is the occupation probability. The resulting graphs are made of clusters of occupied sites. By measuring several properties of their distribution, it is shown that percolation occurs for an occupation probability above a percolation threshold $p_{c}$=0.7360(5). Moreover, critical exponents are compatible with those analytically known for bond percolation.
description: 8 pages, 10 figures. Accepted in Phys. Rev. E ; published version
Miniband engineering and topological phase transitions in topological - normal insulator superlattices
Creators: name: Krizman, G.
name: Assaf, B. A.
name: Bauer, G.
name: Springholz, G.
name: de Vaulchier, L. A.
name: Guldner, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Periodic stacking of topologically trivial and non-trivial layers with opposite symmetry of the valence and conduction bands induces topological interface states that, in the strong coupling limit, hybridize both across the topological and normal insulator layers. Using band structure engineering, such superlattices can be effectively realized using the IV-VI lead tin chalcogenides. This leads to emergent minibands with a tunable topology as demonstrated both by theory and experiments. The topological minibands are proven by magneto-optical spectroscopy, revealing Landau level transitions both at the center and edges of the artificial superlattice mini Brillouin zone. Their topological character is identified by the topological phase transitions within the minibands observed as a function of temperature. The critical temperature of this transition as well as the miniband gap and miniband width can be precisely controlled by the layer thicknesses and compositions. This witnesses the generation of a new fully tunable quasi-3D topological state that provides a template for realization of magnetic Weyl semimetals and other strongly interacting topological phases.
description: 21 pages, 8 figures
HYPERBOLE CROSS-CULTURAL PERSPECTIVE (ON THE EXAMPLE OF ENGLISH AND UZBEK)
Creators: name: Karimova, Hilola
Publisher: name: Zenodo
Year: 2024

description: This literature review examines the role of hyperbole as a rhetorical device in English and Uzbek, highlighting its cultural significance and usage in both languages. It explores how hyperbole serves to express emotions, create vivid imagery, and reflect societal values. In English, hyperbole often emphasizes individuality and personal expression, while in Uzbek, it underscores communal values and shared experiences. The review also addresses the challenges of translating hyperbolic expressions between the two languages, emphasizing the need for cultural sensitivity in translation practices. By comparing hyperbolic expressions in English and Uzbek, this study enriches our understanding of how language and culture intersect, providing valuable insights for linguists, translators, and cultural scholars.
A string averaging method based on strictly quasi-nonexpansive operators with generalized relaxation
Creators: name: Nikazad, Touraj
name: Mirzapour, Mahdi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 90C25, 47J25, 49M20

description: We study a fixed point iterative method based on generalized relaxation of strictly quasi-nonexpansive operators. The iterative method is assembled by averaging of strings, and each string is composed of finitely many strictly quasi-nonexpansive operators. To evaluate the study, we examine a wide class of iterative methods for solving linear systems of equations (inequalities) and the subgradient projection method for solving nonlinear convex feasibility problems. The mathematical analysis is complemented by some experiments in image reconstruction from projections and classical examples, which illustrate the performance using generalized relaxation.
description: arXiv admin note: text overlap with arXiv:1706.06675
Dynamic thermal modelling and characterisation of power lines
Creators: name: Χατζηπαναγιώτου, Παναγιώτης Κ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Γραμμές μεταφοράς ηλεκτρικής ενέργειας
Δυναμική θερμική μοντελοποίηση - χαρακτηρισμός
Προσαρμογή καμπύλης
Θερμική ανάλυση
Electric power line
Dynamic thermal modelling - characterisation
Curve fitting
Thermal analysis

description: Σκοπός της διατριβής ήταν η δυναμική θερμική μοντελοποίηση και χαρακτηρισμός γραμμών μεταφοράς ηλεκτρικής ενέργειας. Για αυτόν τον σκοπό, αναπτύξαμε τη νέα μέθοδο Εκτίμησης Συνάρτησης Μεταφοράς (Transfer Function Estimation – TFE) για δυναμική θερμική ανάλυση. Η νέα μέθοδος καθώς και η υπάρχουσα μέθοδος Αναγνώρισης Δικτύων μέσω Αποσυνέλιξης (Network Identification by Deconvolution – NID) εφαρμόστηκαν για την επεξεργασία θερμοκρασιακών βηματικών αποκρίσεων θεωρητικών και πειραματικών διατάξεων γραμμών μεταφοράς ηλεκτρικής ενέργειας. Επίσης προτάθηκε μία νέα μέθοδο για τη μοντελοποίηση μονωμένων γραμμών μεταφοράς. Προτείναμε επιπλέον ένα βελτιωμένο θερμικό μοντέλο για γραμμές μεταφοράς σε περίπτωση φυσικής συναγωγής. Τέλος, αναπτύξαμε μία μαθηματική συσχέτιση μεταξύ αποκρίσεων λόγω επιβολής βηματικής ισχύος και βηματικού ηλεκτρικού ρεύματος.
description: The aim of the present thesis was the dynamic thermal modelling and characterisation of power lines. For this reason, we established the new Transfer Function Estimation (TFE) methodology for dynamic thermal analysis. This new method and the existing Network Identification by Deconvolution (NID) methodology were applied in order to further process the temperature step responses of theoretical cases and downscaled models of power lines. We also proposed a new modelling method for an insulated power line. Furthermore, an improved thermal modelling of a power line cooled by natural convection was also proposed. Another aim of this study was to develop a mathematical relationship between power and electric current step input.
Capacity Self-Planning in Small Cell Multi-Tenant 5G Networks
Creators: name: Muñoz, Pablo
name: Sallent, Oriol
name: Pérez-Romero, Jordi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Multi-tenancy allows diverse agents sharing the infrastructure in the 5 th generation of mobile networks. Such a feature calls for more automated and faster planning procedures in order to adapt the network capacity to the varying traffic demand. To achieve these goals, Small Cells offer network providers more flexible, scalable, and cost-effective solutions compared to macrocell deployments. This paper proposes a novel framework for cell planning in multi-tenant Small Cell networks. In this framework, the tenant's contracted capacity is translated to a set of detailed planning specifications over time and space domains in order to efficiently update the network infrastructure and configuration. Based on this, an algorithm is proposed that considers different actions such as adding/removing channels and adding or relocating small cells. The proposed approach is evaluated considering the deployment of a new tenant, where different sets of planning specifications are tested.
Epidemics on Hypergraphs: Spectral Thresholds for Extinction
Creators: name: Higham, Desmond John
name: de Kergorlay, Henry-Louis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Discrete Mathematics (cs.DM)
subject: Dynamical Systems (math.DS)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: J.4; J.3
subject: 92C60, 37N25, 05C65

description: Epidemic spreading is well understood when a disease propagates around a contact graph. In a stochastic susceptible-infected-susceptible setting, spectral conditions characterise whether the disease vanishes. However, modelling human interactions using a graph is a simplification which only considers pairwise relationships. This does not fully represent the more realistic case where people meet in groups. Hyperedges can be used to record such group interactions, yielding more faithful and flexible models, allowing for the rate of infection of a node to vary as a nonlinear function of the number of infectious neighbors. We discuss different types of contagion models in this hypergraph setting, and derive spectral conditions that characterize whether the disease vanishes. We study both the exact individual-level stochastic model and a deterministic mean field ODE approximation. Numerical simulations are provided to illustrate the analysis. We also interpret our results and show how the hypergraph model allows us to distinguish between contributions to infectiousness that (a) are inherent in the nature of the pathogen and (b) arise from behavioural choices (such as social distancing, increased hygiene and use of masks). This raises the possibility of more accurately quantifying the effect of interventions that are designed to contain the spread of a virus.
Type-IV DCT, DST, and MDCT algorithms with reduced numbers of arithmetic operations
Creators: name: Shao, Xuancheng
name: Johnson, Steven G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We present algorithms for the type-IV discrete cosine transform (DCT-IV) and discrete sine transform (DST-IV), as well as for the modified discrete cosine transform (MDCT) and its inverse, that achieve a lower count of real multiplications and additions than previously published algorithms, without sacrificing numerical accuracy. Asymptotically, the operation count is reduced from ~2NlogN to ~(17/9)NlogN for a power-of-two transform size N, and the exact count is strictly lowered for all N > 4. These results are derived by considering the DCT to be a special case of a DFT of length 8N, with certain symmetries, and then pruning redundant operations from a recent improved fast Fourier transform algorithm (based on a recursive rescaling of the conjugate-pair split radix algorithm). The improved algorithms for DST-IV and MDCT follow immediately from the improved count for the DCT-IV.
description: 11 pages
Cross section of the Coulomb excitation of $^{229m}$Th by low energy muons
Creators: name: Tkalya, E. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The inelastic scattering cross section for muons, $μ^-$, with energies $E$=9--100~eV from the $^{229}$Th nuclei is calculated in the framework of the second order of the perturbation theory for the quantum electrodynamics. The dominant contribution to the excitation of the low energy isomer $^{229m}$Th$(3/2^+,8.19\pm0.12$~eV) comes from the $E2$ multipole. The excitation cross section reaches the value of $10^{-21}$ cm$^2$ in the range $E\approx$10~eV. This is four to five orders of magnitude larger than the electron excitation cross section and enough for efficient excitation of $^{229m}$Th on the muon beam at the next generation of muon colliders.
description: 9 pages, 4 figures
On The Stability of Non-Supersymmetric Attractors in String Theory
Creators: name: Nampuri, Suresh
name: Tripathy, Prasanta K.
name: Trivedi, Sandip P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study non-supersymmetric attractors obtained in Type IIA compactifications on Calabi Yau manifolds. Determining if an attractor is stable or unstable requires an algebraically complicated analysis in general. We show using group theoretic techniques that this analysis can be considerably simplified and can be reduced to solving a simple example like the STU model. For attractors with D0-D4 brane charges, determining stability requires expanding the effective potential to quartic order in the massless fields. We obtain the full set of these terms. For attractors with D0-D6 brane charges, we find that there is a moduli space of solutions and the resulting attractors are stable. Our analysis is restricted to the two derivative action.
description: 20 pages, Latex
Powers in a class of A-strict standard episturmian words
Creators: name: Glen, Amy
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 68R15

description: This paper concerns a specific class of strict standard episturmian words whose directive words resemble those of characteristic Sturmian words. In particular, we explicitly determine all integer powers occurring in such infinite words, extending recent results of Damanik and Lenz (2003), who studied powers in Sturmian words. The key tools in our analysis are canonical decompositions and a generalization of singular words, which were originally defined for the ubiquitous Fibonacci word. Our main results are demonstrated via some examples, including the $k$-bonacci word: a generalization of the Fibonacci word to a $k$-letter alphabet ($k\geq2$).
description: 26 pages; extended version of a paper presented at the 5th International Conference on Words, Montreal, Canada, September 13-17, 2005
Das Schwedische Modell: Die Gewerkschaftsbewegung der Arbeiter und die Zusammenarbeit zwischen den Tarifpartnern auf dem schwedischen Arbeitsmarkt
Creators: name: Åmark, Klas
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Das Schwedische Modell: Die Gewerkschaftsbewegung der Arbeiter und die Zusammenarbeit zwischen den Tarifpartnern auf dem schwedischen Arbeitsmarkt" of MTS 10 (1990).
description: Moving the Social, Vol 10 (1990): Forschungen zur Arbeiterschaft und Arbeiterbewegung in Schweden
Lowest-energy structures of 13-atom binary clusters: Do icosahedral clusters exist in binary liquid alloys?
Creators: name: Iwamatsu, M.
name: Lai, S. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Although the existence of 13-atom icosahedral clusters in one-component close-packed undercooled liquids was predicted more than half a century ago by Frank, the existence of such icosahedral clusters is less clear in liquid alloys. We study the lowest-energy structures of 13-atom AxB13-x Lennard-Jones binary clusters using the modified space-fixed genetic algorithm and the artificial Lennard-Jones potential designed by Kob and Andersen. Curiously, the lowest-energy structures are non-icosahedral for almost all compositions. The role played by the icosahedral cluster in a binary glass is questionable.
description: 10 pages, 3 figure (conference paper of LAM12) to be published in J. Non-Crystalline Solids
Strong correlation between bonding network and critical temperature in hydrogen-based superconductors
Creators: name: Belli, Francesco
name: Contreras-Garcia, J.
name: Errea, Ion
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recent experimental discoveries show that hydrogen-rich compounds can reach room temperature superconductivity, at least at high pressures. Also that there exist metallic hydrogen-abundant systems with critical temperatures of few Kelvin, or even with no trace of superconductivity at all. By analyzing through first-principles calculations the structural and electronic properties of more than one hundred compounds predicted to be superconductors in the literature, we determine that the capacity of creating a bonding network of connected localized units is the key to enhance the critical temperature in hydrogen-based superconductors, explaining the large variety of critical temperatures of superconducting hydrogen-rich materials. We define a magnitude named as the {\it networking value}, which correlates well with the predicted critical temperature, much better than any other descriptor analyzed thus far. This magnitude can be easily calculated for any compound by analyzing isosurfaces of the electron localization function. By classifying the studied compounds according to their bonding nature, we observe that the {\it networking value} correlates with the critical temperature for all bonding types. Our analysis also highlights that systems with weakened covalent bonds are the most promising candidates for reaching high critical temperatures. The discovery of the positive correlation between superconductivity and the bonding network offers the possibility of screening easily hydrogen-based compounds and, at the same time, sets clear paths for chemically engineering better superconductors.
Gurevich-Pitaevskii problem and its development
Creators: name: Kamchatnov, A. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We present an introduction to the theory of dispersive shock waves in the framework of the approach proposed by Gurevich and Pitaevskii (Zh. Eksp. Teor. Fiz., 65, 590 (1973) [Sov. Phys. JETP, 38, 291 (1974)]) based on the Whitham theory of modulation of nonlinear waves. We explain how Whitham equations for a periodic solution can be derived for the Korteweg-de Vries equation and outline some elementary methods to solve them. We illustrate this approach with solutions to the main problems discussed by Gurevich and Pitaevskii. We consider a generalization of the theory to systems with weak dissipation and discuss the theory of dispersive shock waves for the Gross-Pitaevskii equation.
description: 38 pages, 18 figures
Außenseitertum als Grunderfahrung. Gustav Mayer in Krieg und Revolution
Creators: name: Thiel, Jens
Publisher: name: Moving the Social
Year: 2014

description: Gustav Mayer: Als deutsch-jüdischer Historiker in Krieg und Revolution 1914-1920. Tagebücher, Aufzeichnungen, Briefe. Hg. und eingel. von Gottfried Niedhart, München 2009.
description: Moving the Social, Vol 44 (2010): Forschungen und Forschungsberichte
Calculating the Hyperfine Tensors for Group-IV Impurity-Vacancy Centers in Diamond: A Hybrid Density-Functional Theory Approach
Creators: name: Defo, Rodrick Kuate
name: Kaxiras, Efthimios
name: Richardson, Steven L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The hyperfine interaction is an important probe for understanding the structure and symmetry of defects in a semiconductor. Density-functional theory has shown that it can provide useful first-principles predictions for both the hyperfine tensor and the hyperfine constants that arise from it. Recently there has been great interest in using group-IV impurity-vacancy color centers X$V^-$ (where X = Si, Ge, Sn, or Pb and $V$ is a carbon vacancy) for important applications in quantum computing and quantum information science. In this paper, we have calculated the hyperfine tensors for these X$V^-$ color centers using the HSE06 screened Hartree-Fock hybrid exchange-correlation functional with the inclusion of core electron spin polarization. We have compared our results to calculations which only use the PBE exchange-correlation functional without the inclusion of core electron spin polarization and we have found our results are in very good agreement with available experimental results. Finally, we have theoretically shown that these X$V^-$ color centers exhibit a Jahn-Teller distortion which explains the observed anisotropic distribution of the hyperfine constants among the neighboring $^{13}$C nuclear spins.
title: Teaching Philosophy to Non-Majors as a Form of Public Philosophy
Creators: name: Culbertson, Kristin
Publisher: name: Public Philosophy Journal
Year: 2020
Subjects: subject: FOS: Philosophy, ethics and religion
subject: higher education

description: This is a reflection on my experience teaching ethics as an introductory-level, general education requirement for non-majors and how I understand this as a form of public philosophy. I discuss the unique benefits that can come from teaching students who aren’t self-motivated in the field and the mindset I have adopted in order to maximize and appreciate these benefits. I discuss the teaching practices and principles I have adopted that have worked for me and give my thoughts on why we should view these courses as exciting opportunities, rather than as burdens. Teaching non-philosophy majors can itself be a way of doing public philosophy, if one keeps an open mind and allows one’s teaching and research to respond directly to students’ needs and feedback.
“Das Ruhrgebiet – ein historisches Lesebuch“: Abschlussbericht über das Gemeinschaftsprojekt von Stiftung und Institut (2007–2010)
Creators: name: Urban, Thomas
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "'Das Ruhrgebiet – ein historisches Lesebuch': Abschlussbericht über das Gemeinschaftsprojekt von Stiftung und Institut (2007–2010)" of MTS 44 (2010).
description: Moving the Social, Vol 44 (2010): Forschungen und Forschungsberichte
Μελέτη και ανάλυση της εξ αποστάσεως εργαστηριακής εκπαίδευσης στη Φυσική με πραγματικά πειράματα
Creators: name: Δίντσιος, Νικόλαος Θ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Πραγματικά πειράματα από απόσταση
Πειράματα και διδακτική
Διδακτική της Φυσικής
Remote experiments
Physics education

description: Σκοπός της διατριβής ήταν η ανάπτυξη και εφαρμογή στην εκπαιδευτική διαδικασία πραγματικών πειραμάτων από απόσταση. Αρχικά, και αφού προηγήθηκε, η μελέτη της σχετικής διεθνούς βιβλιογραφίας, υλοποιήθηκαν δέκα πειράματα από απόσταση. Στη συνέχεια ένας αριθμός από τα παραπάνω πειράματα εφαρμόστηκαν στην πρωτοβάθμια – δευτεροβάθμια – τριτοβάθμια εκπαίδευση αλλά και σε εκπαιδευτικούς κατά περίπτωση. Στη συνέχεια, και από την εφαρμογή που προαναφέρθηκε, εξάγαμε συμπεράσματα αφενός για την επίτευξη των διδακτικών στόχων που θέσαμε και αφετέρου για την αποδοχή των πραγματικών πειραμάτων από απόσταση από την εκπαιδευτική κοινότητα. Επιπλέον, και μελετώντας τα εργαλεία που είχαμε στη διάθεσή μας, μπορέσαμε να εξάγουμε χρήσιμα συμπεράσματα, τα οποία αφορούν στις μέρες και στις συσκευές που χρησιμοποίησαν οι διάφοροι χρήστες ανά τον κόσμο, ώστε να διενεργήσουν κάποιες από τις εργαστηριακές ασκήσεις που υλοποιήσαμε.
description: The aim of the present thesis was the development and application to the educational process of real experiments from a distance (remote experiments). Initially, and following the study of the relevant international literature, ten experiments were constructed. Then, a number of the above experiments were applied to primary – secondary – tertiary education as well as to teachers on a case by case basis. Furthermore, from the above-mentioned application, several conclusions were extracted such as the achievement of the educational objectives we had set and the acceptance of remote experiments from the educational community. In addition, and by analyzing the pertinent data that were collected by the tools at our disposal, we were able to draw useful conclusions about the days and the devices used by various users around the world to carry out specific laboratory exercises that we had constructed.
Neo-orientalism : ugly women and the Parisian avant-garde, 1905-1908
Creators: name: Kirk, Elizabeth Gail
Publisher: name: University of British Columbia
Year: 2010

description: The Neo-Orientalism of Matisse's The Blue Nude (Souvenir of Biskra), and Picasso's Les Demoiselles d'Avignon, both of 1907, exists in the similarity of the extreme distortion of the female form and defines the different meanings attached to these "ugly" women relative to distinctive notions of erotic and exotic imagery. To understand Neo-Orientalism, that is, 19th century Orientalist concepts which were filtered through Primitivism in the 20th century, the racial, sexual and class antagonisms of the period, which not only influenced attitudes towards erotic and exotic imagery, but also defined and categorized humanity, must be considered in their historical context. My introduction is an investigation of current art historical scholarship which has linked the manipulation of form by Matisse and Picasso and shifting avant-garde practice in Paris in the years 1905 - 1908, when Cubism displaced Fauvism, to the concepts of Orientalism and Primitivism. The problem of the ideological content of images of women, which I undertake to address, arises from these studies which rely upon the assumed metaphysical fascination with the exotic or the intuitive, personal concern for erotic symbolism by the artists as a solution to meaning. The absence of a rich critical discourse surrounding the paintings encourages my approach to the problem of meaning whereby in Chapter One I examine images of women produced in Paris in the specific discourses of popular and official culture in 1906. These representations of the female are identified as ideological constructions which functioned in relation to the important and broader issues of the moment affecting the dominance of French culture: class struggle and neo-colonialism. In Chapter Two the "ugly" women of Matisse's The Blue Nude (Souvenir of Biskra) and Picasso's Les Demoiselles d'Avignon are analysed as intended avant-garde transformations of images of female prostitutes and compared with the Images of women In popular and official culture and with each other, In recognition of their function within the historical context of their production. In conclusion I suggest that the difference in meaning between these paintings by Matisse and Picasso was Ideological, operating within the context of class struggle and neo-colonialism, and defined by their distinctive conscious and unconscious use of Primitivism.
Incorporation of Si atoms into CrCoNiFe high-entropy alloy: a DFT study
Creators: name: Aravindh, S. Assa
name: Kistanov, Andrey A.
name: Alatalo, Matti
name: Kömi, Jukka
name: Huttula, Marko
name: Cao, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Density functional theory based computational study has been conducted in order to investigate the effect of substitution of Cr and Co components by Si on the structure, mechanical, electronic, and magnetic properties of the high entropy alloy CrCoNiFe. It is found that the presence of a moderate concentration of Si substitutes (up to 12.5 %) does not significantly reduce the structural and mechanical stability of CrCoNiFe while it may modify its electronic and magnetic properties. Based on that, Si is proposed as a cheap and functional material for partial substitution of Cr or Co in CrCoNiFe.