cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Super-exponential cutoff as a probe of annihilating dark matter
Creators: name: Belikov, Alexander V.
name: Silk, Joseph
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the possibility of fitting the putative spectrum of gamma-rays from annihilating dark matter at the Galactic Center by a super-exponential template. By generating and analyzing mock data for several ongoing and future experiments (HESS, CTA and DMA), we find that the preference for a super-exponential template (over an exponential) is especially strong for dark matter annihilating to $τ^+τ^-$ and $μ^+μ^-$ relative to other annihilation channels.
description: 4 pages, 5 figures. Matches the published version (references added, typos corrected)
Co- designing Opportunities with Young People and Organisations in the North West of England
Creators: name: Wareing, Laura
Publisher: name: Lancaster University
Year: 2022
Subjects: co-design
design
young people
inequalities
equity
place-based
North West England
work opportunities
employment

description: This practice-led research presents an understanding of how collaborative approaches to co-design can be applicable and valuable in providing support for young people in left behind and overlooked communities across the North West of England in partnership with a range of organisations based in the region. The study provides new knowledge on how co-design approaches can be used to address place-based disparities, such as employment and learning opportunities in the United Kingdom. The research is part of a doctoral research training programme funded by the AHRC called Transformation North West. An action research approach and case study structure were applied in four projects with publicly funded organisations who specialised in design, arts, education, and youth support. Each case study focuses on utilising co- design approaches in a specific geographical location in and close to the North West of England, in areas where young people face significant barriers to work opportunities. The research included the design of workshops, structures, and tools to engage local young people and organisations, and explored the design of interventions to connect young people to opportunities and local support. Data on the design, application,impact, and perceived value of the approaches was reflected upon and captured during and after the projects. A thematic analysis process was carried out to generate theory and understanding of the approaches.This research has multiple contributions to knowledge including detailed evidence that co-design approaches can be used as a tool to address geographical inequalities in opportunities for young people in partnership with local organisations and deliver a range of socio-economic outcomes. It contributes knowledge on the design of co-design approaches aiming to address complex socio-economic challenges, generate long-lasting social change, as well as the challenges and opportunities of co-design application in this context. The study provides timely evidence that co-design approaches can deliver value to communities who have been overlooked, making a difference to lives, as well as fostering conditions for a sustainable and inclusive economy.
Spanners for geometric intersection graphs with applications
Creators: name: Fürer, Martin
name: Kasiviswanathan, Shiva Prasad
Publisher: name: Journal of Computational Geometry
Year: 2012

description: A ball graph is an intersection graph of a set of balls with arbitrary radii. Given a real numbert>1, we say that a subgraph G' of a graph G is a t-spanner of G, if for every pair of verticesu,v in G, there exists a path in G' of length at most t times the distance between u and v inG. In this paper, we consider the problem of efficiently constructing sparse spanners of ball graphs which supports fast shortest path distance queries. We present the first algorithm for constructing spanners of ball graphs. For a ball graph in Rk, we construct a (1+ε)-spanner for any ε>0 with O(nε-k+1) edges in O(n2ℓ+δε-k logℓ S) time, using an efficient partitioning of space into hypercubes and solving intersection problems. Here ℓ=1-1/(⌊k/2⌋+2), δ is any positive constant, and S is the ratio between the largest and smallest radius. For the special case when the balls all have unit size, we show that the complexity of constructing a (1+ε)-spanner is almost equal to the complexity of constructing a Euclidean minimum spanning tree. The algorithm extends naturally to other disk-likeobjects, also in higher dimensions. The algorithm uses an efficient subdivision of space to construct a sparse graph having many of the same distance properties as the input ball graph. Additionally, the constructed spanners have a small vertex separator decomposition (hereditary). In dimension k=2, the disk graph spanner has an O(n1/2ε-3/2+ε-3log S) separator. The presence of a small separator is then exploited to obtain very efficient data structures for approximate distance queries. The results on geometric graph separators might be of independent interest. For example, since complete Euclidean graphs are just a special case of (unit) ball graphs, our results also provide a new approach for constructing spanners with small separators in these graphs.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Cosmological Perturbations of a Quartet of Scalar Fields with a Spatially Constant Gradient
Creators: name: Koh, Seoktae
name: Kouwn, Seyen
name: Kwon, O-Kab
name: Oh, Phillial
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the linear perturbations for the single scalar field inflation model interacting with an additional triad of scalar fields. The background solutions of the three additional scalar fields depend on spatial coordinates with a constant gradient $α$ and the ensuing evolution preserves the homogeneity of the cosmological principle. After we discuss the properties of background evolution including an exact solution for the exponential-type potential, we investigate the linear perturbations of the scalar and tensor modes in the background of the slow-roll inflation. In our model with small $α$, the comoving wavenumber has {\it a lower bound} $\sim αM_{\rm P}$ to have well-defined initial quantum states. We find that cosmological quantities, for instance, the power spectrums and spectral indices of the comoving curvature and isocurvature perturbations, and the running of the spectral indices have small corrections depending on {\it the lower bound}. Similar behaviors happen for the tensor perturbation with the same lower bound.
description: 26 pages, 1 figure, minor corrections, references are added, published version
Upper bounds for centerlines
Creators: name: Bukh, Boris
name: Nivasch, Gabriel
Publisher: name: Journal of Computational Geometry
Year: 2012

description: In 2008, Bukh, Matoušek, and Nivasch conjectured that for every n-point set S in ℝd and every k, 0 ≤ k ≤ d-1, there exists a k-flat f in ℝd (a centerflat) that lies at depth (k + 1)n/(k + d + 1) - O(1) in S, in the sense that every halfspace that contains f contains at least that many points of S. This claim is true and tight for k = 0 (this is Rado's centerpoint theorem), as well as for k = d-1 (trivial). Bukh et al. showed the existence of a (d - 2)-flat at depth (d - 1)n/(2d - 1) - O(1) (the case k = d- 2). In this paper we concentrate on the case k = 1 (the case of centerlines), in which the conjectured value for the leading constant is 2/(d + 2). We prove that 2/(d + 2) is an upper bound for the leading constant. Specifically, we show that for every fixed d and every n there exists an n-point set in ℝd for which no line in ℝd lies at depth greater than 2n/(d + 2) + o(n). This point set is the stretched grid—a set which has been previously used by Bukh et al. for other related purposes. Hence, in particular, the conjecture is now settled for ℝ3 .
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
title: Laut, Buchstabe, Wort und Satz. Verzeichnis grundlegender grammatischer Fachausdrücke
titleType: AlternativeTitle
Creators: name: Kultusministerkonferenz
Publisher: name: Leibniz-Institut für Deutsche Sprache (IDS)
Year: 2020

description: Das vorliegende „Verzeichnis grundlegender grammatischer Fachausdrücke“ beruht auf einem Konsens, den das „Gremium für Schulgrammatische Terminologie“ unter Berücksichtigung fachwissenschaftlicher, fachdidaktischer und unterrichtspraktischer Gesichtspunkte hergestellt hat. Ziel dieses Verzeichnisses ist es, Anhaltspunkte zu geben für die Konzeption von Lehrplänen und Schulbüchern für das Fach Deutsch.
Der Grenzstein des Pagus Carucum
Creators: name: Bergk, Theodor
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 57 (1876): Jahrbücher des Vereins von Alterthumsfreunden im Rheinlande
Die Chroniken der niederrheinischen Städte. Köln. Erster Band.
Creators: name: Düntzer, Heinrich
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Die Chroniken der niederrheinischen Städte. Köln. Erster Band. Auf Veranlassung und mit Unterstützung seiner Majestät des Königs von Bayern Maximilian II. Herausgegeben durch die historische Commission bei der Königl. Akademie der Wissenschaften. Leipzig, Verlag von S. Hirzel, 1875.
description: Bonner Jahrbücher, Bd. 57 (1876): Jahrbücher des Vereins von Alterthumsfreunden im Rheinlande
Measurement of the Lambda(b)0 lifetime in pp collisions at sqrt(s) = 7 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A measurement of the Lambda(b)0 lifetime using the decay Lambda(b)0 to J/Psi Lambda in proton-proton collisions at sqrt(s) = 7 TeV is presented. The data set, corresponding to an integrated luminosity of about 5 inverse femtobarns, was recorded with the CMS experiment at the Large Hadron Collider using triggers that selected dimuon events in the J/Psi mass region. The Lambda(b)0 lifetime is measured to be 1.503 +/- 0.052 (stat.) +/- 0.031 (syst.) ps.
description: Replaced with published version. Added journal reference and DOI
title: THE DETECTION OF UNUSUAL MYCOPLASMA CELLS PERSISTENT IN MONKEYS
Creators: name: Rakovskaya, Irina V.
name: Arshba, Ilona M.
name: Barkhatova, Olga I.
name: Levina, Galina A.
name: Gorina, Luiza G.
name: Gamova, Nata'lya A.
name: Goncharova, Svetlana A.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: Long-term cooperation FSBI “Gamaleya Federal Scientific Research Center of Epidemiology and Microbiology”, Russia and Research Institute of Medical Primatology, Russia on the research of spontaneous Mycoplasma infection in different monkey species of the Adler colony showed a wide prevalence of Mycoplasma and Ureaplasma carriers. Mycoplasma isolated from the apes and forming mini-colonies are similar to those isolated from patients with various chronic pathological processes. The cells of mini-colonies are resistant to various unfavourable factors causing the death of cells of classical colonies. The cells of mini-colonies are resistant to antibiotics, which have fundamentally different mechanisms of action. Key words: mycoplasma, ureaplasma, monkeys, mini-colonies, antibiotics.
The emergence of sparse spanners and well-separated pair decomposition under anarchy
Creators: name: Zhou, Dengpan
name: Gao, Jie
Publisher: name: Journal of Computational Geometry
Year: 2012

description: A spanner graph on a set of points in Rd provides shortest paths between any pair of points with lengths at most a constant factor of their Euclidean distance. A spanner with a sparse set of edges is thus a good candidate for network backbones, as desired in many practical scenarios such as the transportation network and peer-to-peer network overlays. In this paper we investigate new models and aim to interpret why good spanners ‘emerge’ in reality, when they are clearly built in pieces by agents with their own interests and the construction is not coordinated. We show that the following algorithm of constructing an edge pq, if and only if there is no existing edge p′q′ with p′ and q′ at distances no more than (4(1+1/ε))-1·|pq| from p, qrespectively, generates a (1+ε)-spanner with a linear number of edges. The algorithm also implies a simple algorithm for constructing linear-size well-separated pair decompositions that may be of interest on their own. This new spanner construction algorithm has applications in the construction of nice network topologies for peer-to-peer systems, when peers join and leave the network and have only limited information about the rest of the network.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
title: SCREENING OF ANTIMICROBIAL ACTIVITY OF ASTRAGALUS VULPINUS WILLD. HERB EXTRACT
Creators: name: Sal’nikova, Natal’ya A.
name: Shur, Yuliya V.
name: Tsibizova, Aleksandra A.
name: Konovalov, Dmitriy A.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: The study examined the antimicrobial activity of Astragalus vulpinus Willd. extract under in vitro conditions of six strains of microorganisms by successive dilutions and diffusion into agar. The most sensitive microorganisms to the extract Astragalus vulpinus Willd. have been found to be Staphylococcus aureus, Proteus mirabilis, Klebsiella pneumoniae, Escherichia soli, Enterococcus aerogenes. The antimicrobial effect on Gram-negative microorganisms was more pronounced in comparison with Gram-positive microorganisms, which showed bacteriostatistic action on Staphylococcus aureus and bactericidal action on strains Enterococcus aerogenes, Klebsiella pneumoniae, Escherichia coli, Proteus mirabilis. Key words: Astragalus vulpinus Willd., plant extract, opportunistic microorganisms, bactericidal effect, bacteriostatic effect.
Waiting time distributions for the transport through a quantum dot tunnel coupled to one normal and one superconducting lead
Creators: name: Rajabi, Leila
name: Pöltl, Christina
name: Governale, Michele
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have studied the Waiting Time Distributions (WTDs) for sub-gap transport through a single-level quantum dot tunnel coupled to one normal and one superconducting lead. The WTDs reveal the internal dynamics of the system in particular the coherent transfer of Cooper pairs between the dot and the superconductor. The WTDs exhibit oscillations that can be directly associated to the coherent oscillation between the empty and doubly occupied dot. The oscillation frequency is equal to the energy splitting between the Andreev bound states. These effects are more pronounced when the empty state and double occupied state are in resonance.
description: 6 pages and 4 figures (including supplementary information)
$d$-representability of simplicial complexes of fixed dimension
Creators: name: Tancer, Martin
Publisher: name: Journal of Computational Geometry
Year: 2011

description: Let K be a simplicial complex with vertex set V = v1,…,vn. The complex K is d-representable if there is a collection {C1,…,Cn} of convex sets in Rd such that a subcollection {Ci1,…,Cij} has a nonempty intersection if and only if {vi1,…,vij} is a face of K. In 1967 Wegner proved that every simplicial complex of dimension d is (2d+1)-representable. He also conjectured that his bound is the best possible, i.e., that there are d-dimensional simplicial complexes which are not 2d-representable. However, he was not able to prove his conjecture. We prove that his suggestion was indeed right. Thus we add another piece to the puzzle of intersection patterns of convex sets in Euclidean space.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
Recursive tilings and space-filling curves with little fragmentation
Creators: name: Haverkort, Herman
Publisher: name: Journal of Computational Geometry
Year: 2011

description: This paper defines the Arrwwid number of a recursive tiling (or space-filling curve) as the smallest number a such that any ball Q can be covered by a tiles (or curve fragments) with total volume O(volume(Q)). Recursive tilings and space-filling curves with low Arrwwid numbers can be applied to optimize disk, memory or server access patterns when processing sets of points inRd. This paper presents recursive tilings and space-filling curves with optimal Arrwwid numbers. For d ≥ 3, we see that regular cube tilings and space-filling curves cannot have optimal Arrwwid number, and we see how to construct alternatives with better Arrwwid numbers.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
The effects of rotation on the main-sequence turnoff of intermediate-age massive star clusters
Creators: name: Yang, Wuming
name: Bi, Shaolan
name: Meng, Xiangcun
name: Liu, Zhie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The double or extended main-sequence turnoffs (MSTOs) in the color-magnitude diagram (CMD) of intermediate-age massive star clusters in the Large Magellanic Cloud are generally interpreted as age spreads of a few hundred Myr. However, such age spreads do not exist in younger clusters (i.e., 40-300 Myr), which challenges this interpretation. The effects of rotation on the MSTOs of star clusters have been studied in previous works, but the results obtained are conflicting. Compared with previous works, we consider the effects of rotation on the MS lifetime of stars. Our calculations show that rotating models have a fainter and redder MSTO with respect to non-rotating counterparts with ages between about 0.8 and 2.2 Gyr, but have a brighter and bluer MSTO when age is larger than 2.4 Gyr. The spread of the MSTO caused by a typical rotation rate is equivalent to the effect of an age spread of about 200 Myr. Rotation could lead to the double or extended MSTOs in the CMD of the star clusters with ages between about 0.8 and 2.2 Gyr. However, the extension is not significant; and it does not even exist in younger clusters. If the efficiency of the mixing were high enough, the effects of the mixing would counteract the effect of the centrifugal support in the late stage of evolution; and the rotationally induced extension would disappear in the old intermediate-age star clusters; but younger clusters would have an extended MSTO. Moreover, the effects of rotation might aid in understanding the formation of some "multiple populations" in globular clusters.
description: 18 pages, 13 figures. Accepted by ApJ
Good quality virtual realization of unit disk graphs
Creators: name: Pemmaraju, Sriram
name: Pirwani, Imran
Publisher: name: Journal of Computational Geometry
Year: 2011

description: We consider the problem of finding a realization of an n-vertex unit disk graph (UDG) expressed in general form, say, as an adjacency matrix. The problem is to construct an embedding of the graph in low-dimensional Euclidean space so that the ratio of the length of the longest edge under the embedding to the length of the shortest non-edge under the embedding is as small as possible; the measure is known as the quality of the realization. Thus, an optimum quality realization has quality between 1/2 and 1. Kuhn et al. gave aO(log3.5 n (loglog n)1/2}) quality realization that requires solving a linear program with exponentially many constraints by using the ellipsoid algorithm. In this article, we give a combinatorial algorithm that achieves an O(log3 n) quality realization of an n-vertex UDG expressed in general form. Thus, not only is our algorithm an improvement, it also bypasses the standard and costly technique of solving a linear program with exponentially many “spreading constraints.” As a side effect of our construction, we get the first constant-factor approximation to the minimum clique partition problem for UDGs expressed in general form. Such a clique partition also represents our key technical contribution. If the embedding is allowed to reside in higher dimensional space, we obtain improved results: a quality-2 embedding in constant dimensional Euclidean space.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
Constant-work-space algorithms for geometric problems
Creators: name: Asano, Tetsuo
name: Mulzer, Wolfgang
name: Rote, Günter
name: Wang, Yajun
Publisher: name: Journal of Computational Geometry
Year: 2011

description: Constant-work-space algorithms may use only constantly many cells of storage in addition to their input, which is provided as a read-only array. We show how to construct several geometric structures efficiently in the constant-work-space model. Traditional algorithms process the input into a suitable data structure (like a doubly-connected edge list) that allows efficient traversal of the structure at hand. In the constant-work-space setting, however, we cannot afford to do this. Instead, we provide operations that compute the desired features on the fly by accessing the input with no extra space. The whole geometric structure can be obtained by using these operations to enumerate all the features. Of course, we must pay for the space savings by slower running times. While the standard data structure allows us to implement traversal operations in constant time, our schemes typically take linear time to read the input data in each step. We begin with two simple problems: triangulating a planar point set and finding the trapezoidal decomposition of a simple polygon. In both cases adjacent features can be enumerated in linear time per step, resulting in total quadratic running time to output the whole structure. Actually, we show that the former result carries over to the Delaunay triangulation, and hence the Voronoi diagram. This also means that we can compute the largest empty circle of a planar point set in quadratic time and constant work-space. As another application, we demonstrate how to enumerate the features of an Euclidean minimum spanning tree (EMST) in quadratic time per step, so that the whole EMST can be found in cubic time using constant work-space. Finally, we describe how to compute a shortest geodesic path between two points in a simple polygon. Although the shortest path problem in general graphs is NL-complete (Jakoby and Tantau 2003), this constrained problem can be solved in quadratic time using only constant work-space.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
Degenerate regimes for random growth models in the complex plane
Creators: name: Higgs, Frankie
Publisher: name: Lancaster University
Year: 2022

description: Diffusion-limited aggregation (DLA) is among the most studied models in mathematical physics, and obtaining results on the limiting geometry has proved one of the more difficult problems of the past few decades. At the same time, techniques from complex analysis and conformal mapping theory have become popular following the definition of the Schramm-Loewner evolution by Schramm in 2000 and its subsequent use to solve scaling limit and other problems for planar models in statistical physics. This thesis analyses the aggregate Loewner evolution (ALE) model, introduced by Sola, Turner and Viklund in 2018 to generalise versions of DLA in the complex plane. The ALE is a model of growth where a particle is added at a location on the existing cluster at a point chosen by a regularised version of harmonic measure, transformed by a parameter η. The three main chapters of this thesis examine ALE for extreme values of η, where the behaviour becomes degenerate in some sense. In Chapter 2, we demonstrate that for large negative values, η < −2, which correspond to attachment in areas of low harmonic measure, each particle is attached near the base of the previous particle. A consequence of this is the convergence of the ALE cluster to a Schramm-Loewner evolution curve. This contributes one of the first scaling limit results with a non-deterministic limit for an aggregation model in the complex plane. In Chapter 3, we extend the results of Sola, Turner and Viklund for η > 1, demonstrating that when started from a non-trivial initial configuration, the scaling limit is the geodesic Laplacian path model, a model of needle growth generalising several physical models. In Chapter 4 we examine stability of the ALE for η > 1. We find a phase transition, with increasing stability such that an additional small perturbation survives if and only if 1 < η < 2.
AGILE Mini-Calorimeter gamma-ray burst catalog
Creators: name: Galli, M.
name: Marisaldi, M.
name: Fuschino, F.
name: Labanti, C.
name: Argan, A.
name: Barbiellini, G.
name: Bulgarelli, A.
name: Cattaneo, P. W.
name: Colafrancesco, S.
name: Del Monte, E.
name: Feroci, M.
name: Gianotti, F.
name: Giuliani, A.
name: Longo, F.
name: Mereghetti, S.
name: Morselli, A.
name: Pacciani, L.
name: Pellizzoni, A.
name: Pittori, C.
name: Rapisarda, M.
name: Rappoldi, A.
name: Tavani, M.
name: Trifoglio, M.
name: Trois, A.
name: Vercellone, S.
name: Verrecchia, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Mini-Calorimeter of the AGILE satellite can observe the high-energy part of gamma-ray bursts with good timing capability. We present the data of the 85 hard gamma-ray bursts observed by the Mini-Calorimeter since the launch (April 2007) until October 2009. We report the timing data for 84 and spectral data for 21 bursts.
description: Paper accepted by: Astronomy and Astrophysics, 11 pages, 7 figures. Detailed GRB data will be available from ASI-ASDC: http://www.asdc.asi.it/mcalgrbcat/ Some typo errors has been corrected in the last versions
Delaunay triangulation of imprecise points, preprocess and actually get a fast query time
Creators: name: Devillers, Olivier
Publisher: name: Journal of Computational Geometry
Year: 2011

description: We propose a new algorithm to preprocess a set of n disjoint unit disks in O(n log n) expected time, allowing to compute the Delaunay triangulation of a set of n points, one from each disk, in O(n) expected time. Our algorithm has the same asymptotic complexity as previous ones for this problem, but our algorithm is much simpler and it runs faster in practice than a direct computation of the Delaunay triangulation.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
Stochastic thermodynamics of active Brownian particles
Creators: name: Ganguly, Chandrima
name: Chaudhuri, Debasish
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Examples of self propulsion in strongly fluctuating environment is abound in nature, e.g., molecular motors and pumps operating in living cells. Starting from Langevin equation of motion, we develop a fluctuating thermodynamic description of self propelled particles using simple models of velocity dependent forces. We derive fluctuation theorems for entropy production and a modified fluctuation dissipation relation, characterizing the linear response at non-equilibrium steady states. We study these notions in a simple model of molecular motors, and in the Rayleigh-Helmholtz and energy-depot model of self propelled particles.
description: 8 pages, version accepted in Phys. Rev. E
Approximate Euclidean Ramsey theorems
Creators: name: Dumitrescu, Adrian
Publisher: name: Journal of Computational Geometry
Year: 2011

description: According to a classical result of Szemerédi, every dense subset of 1,2,…,N contains an arbitrary long arithmetic progression, if N is large enough. Its analogue in higher dimensions due to Fürstenberg and Katznelson says that every dense subset of {1,2,…,N}d contains an arbitrary large grid, if N is large enough. Here we generalize these results for separated point sets on the line and respectively in the Euclidean space: (i) every dense separated set of points in some interval [0,L] on the line contains an arbitrary long approximate arithmetic progression, if L is large enough. (ii) every dense separated set of points in the d-dimensional cube [0,L]d in Rd contains an arbitrary large approximate grid, if L is large enough. A further generalization for any finite pattern in Rd is also established. The separation condition is shown to be necessary for such results to hold. In the end we show that every sufficiently large point set in Rd contains an arbitrarily large subset of almost collinear points. No separation condition is needed in this case.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
Connected rectilinear graphs on point sets
Creators: name: Löffler, Maarten
name: Mumford, Elena
Publisher: name: Journal of Computational Geometry
Year: 2011

description: Let V be a set of n points in Rd. We study the question whether there exists an orientation such that V is the vertex set of a connected rectilinear graph in that orientation. A graph is rectilinear if its edges are straight line segments in d pairwise perpendicular directions. We prove that at most one such orientation can be possible, up to trivial rotations of 90 degrees around some axis. In addition, we present an algorithm for computing this orientation (if it exists) in O(nd) time when d≥2.
description: Journal of Computational Geometry, Vol. 2 No. 1 (2011)
AC-field-induced Polarization for Uncharged Colloids in Salt Solution: A Dissipative Particle Dynamics Simulation
Creators: name: Zhou, Jiajia
name: Schmid, Friederike
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the response of a spherical colloid under alternating electric fields (AC-fields) by mesoscopic simulation method, accounting in full for hydrodynamic and electrostatic interactions. We focus on a special case of uncharged colloids. The main polarization mechanism is the "volume-polarization", where ionic currents are deflected by the core of the uncharged colloid. Specifically, we compute the polarizability of a single colloid and systematically investigate the effect of AC field frequency and salt concentration. The simulation results are compared with predictions from classical Maxwell-Wagner theory and electrokinetic theory.
description: 11 pages, 9 figures, submitted to Eur. Phys. J. E
title: Образы-символы, созданные Л.Н.Толстым, в русской картине мира и русской вербальной культуре
Creators: name: Абрамова, Вероника
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: Многие художественные образы, созданные Л.Н.Толстым, являются культурными доминантами в русской картине мира и символами в русской вербальной культуре. Они присутствуют в текстах современной массовой культуры (ономастическая лексика, фразеология, анекдоты, поликодовые тексты интернет-пространства — мемы, демотиваторы и др.) и не только сохраняют и транслируют содержащийся в них культурный код, но и обретают новые смысловые оттенки. Речь идет о толстовских образах-персонажах (Наташа Ростова, Платон Каратаев, Анна Каренина, Филипок и др.), а также об ассоциативно связанных с ними образах другого рода — пейзажах, событиях, локациях (небо Аустерлица, старый дуб, первый бал, железная дорога). В современной культуре эти образы, отсылающие к древнейшим представлениям людей о мире и сохраняющие память о своем художественном контексте, оказываются востребованными и часто воспроизводимыми. Они могут играть роль символов женственности (Анна Каренина), детства (Филипок), инициации (первый бал Наташи Ростовой), философского постижения жизни (Платон Каратаев). Кроме того, значения этих образов расширяются, отталкиваясь от тех, которые вкладывал в них автор (например, Наташа Ростова — ‘молодая учительница русского языка’ в школьном жаргоне). Таким образом, тексты Л.Н.Толстого продолжают влиять на русскую картину мира на современном этапе ее развития.
title: Проблемы казахско-русского двуязычия и их интерпретация в трудах современных лингвистов
Creators: name: Аманжолова, Кульназия
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: Анализируется двуязычие как одно из наиболее развивающихся явлений в социуме Республики Казахстан. Рассматриваются определения понятия «двуязычие» в представлении ученых разных школ и направлений. Раскрываются виды и типы двуязычия. Показаны разные точки зрения в интерпретациях двуязычия русскими и казахскими учеными. Основное внимание уделяется проблемам взаимодействия и сохранения языков в условиях поликультурного пространства Республики Казахстан.
Heterostructure bilayer graphene-hBN: Interplay between misalignment, interlayer asymmetry, and trigonal warping
Creators: name: Mucha-Kruczynski, M.
name: Wallbank, J.
name: Fal'ko, V. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the superlattice minibands produced by the interplay between moiré pattern induced by hexagonal BN substrate on graphene layer and the interlayer coupling in bilayer graphene with Bernal stacking (BLG). We compare moiré miniband features in BLG, where they are affected by the interlayer asymmetry of BLG-hBN heterostructure and trigonal warping characteristic for electrons in Bernal-stacked bilayers with those found in monolayer graphene.
description: 12 pages, 5 figures, elaborated on the role of trigonal warping, added discussion of zero-energy gaps in MLG and BLG
title: Миноритарные языки Бретани в городском пространстве: бретонский vs. галло
Creators: name: Бухонкина, Анна
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: Рассматриваются миноритарные языки Бретани — бретонский и галло — с точки зрения факторов, способствующих их витальности. Анализируется представленность миноритарных языков в городском пространстве с последующим утверждением о том, что бретонский язык в контексте современной социолингвистической ситуации Бретани становится идеологическим инструментом, направленным на усиление престижности всего региона в целом. Преимущество бретонского языка над галло в первую очередь становится очевидным при анализе городского и дорожного ландшафта Бретани. В работе подчеркивается, что двуязычные вывески и указатели помимо утилитарной функции, стали своеобразным маркером лингвистического разнообразия региона.
Transmission matrices in gl(N) & U_q(gl(N)) quantum spin chains
Creators: name: Doikou, Anastasia
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The gl(N) and U_q(gl(N)) quantum spin chains in the presence of integrable spin impurities are considered. Within the Bethe ansatz formulation, we derive the associated transmission amplitudes, and the corresponding transmission matrices -representations of the underlying quadratic algebra- that physically describe the interaction between the various particle-like excitations displayed by these models and the spin impurity.
description: 21 pages, Latex. Typos corrected
Vortex Lattices and Crystalline Geometries
Creators: name: Bao, Ning
name: Harrison, Sarah
name: Kachru, Shamit
name: Sachdev, Subir
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider $AdS_2 \times R^2$ solutions supported by a magnetic field, such as those which arise in the near-horizon limit of magnetically charged $AdS_4$ Reissner-Nordstrom black branes. In the presence of an electrically charged scalar field, such magnetic solutions can be unstable to spontaneous formation of a vortex lattice. We solve the coupled partial differential equations which govern the charged scalar, gauge field, and metric degrees of freedom to lowest non-trivial order in an expansion around the critical point, and discuss the corrections to the free energy and thermodynamic functions arising from the formation of the lattice. We describe how such solutions can also be interpreted, via S-duality, as characterizing infrared crystalline phases of conformal field theories doped by a chemical potential, but in zero magnetic field; the doped conformal field theories are dual to geometries that exhibit dynamical scaling and hyperscaling violation.
description: 25 pages, 4 figures; v2, minor changes
Adsorption of the nitrosamine and thionitrosamine molecules as carcinogen compounds on the BN and B3Al N nanotubes: A DFT study
Creators: name: Makiabadi, Batoul
name: Zakarianezhad, Mohammad
name: Ekrami-Kakhki, Mehri Saddat
name: Zareye, Shamsi
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Hematology

description: DFT calculations were performed to investigation of the influence of doping three atoms of aluminum on the electronic properties of the (4,0) zigzag boron nitride nanotube (BNNT). Also, adsorption properties of nitrosamine (NA) and thionitrosamine (TNA) molecules as carcinogen agents onto BN and BAl3N nanotubes were studied. The results show that the B3AlN nanotube is the most energetically favorable candidates for adsorption of these molecules. Also, B(B3Al)NNT/TNA complexes are more stable than B(B3Al)NNT/NA complexes. The HOMO–LUMO gap, electronic chemical potential (μ), hardness (ƞ), softness (S), the maximum amount of electronic charge (ΔNmax) and electrophilicity index (ω) for monomers and complexes in the gas and polar solvent phases were calculated. The results show that the conductivity and reactivity of BNNT increase by doping Al atoms instead of B atoms. Also, the interaction of NA and TNA molecules with BN and BAl3N nanotubes results in significant changes in the electronic properties of nanotubes. Based on the natural bond orbital (NBO) analysis, in all complexes charge transfer occurs from NA and TNA molecules to nanotubes. Theory of atoms in molecules (AIM) was applied to characterize the nature of interactions in nanotubes. It is predicted that, BN and B3AlN nanotubes can be used to as sensor for detection of NA and TNA molecules.
title: MICROECOLOGICAL CHANGE IN COLON MUCOSA OF RAT UNDER RESTRAINT STRESS CONDITIONS AND SEMAX TREATMENT
Creators: name: Svishcheva, Mariya V.
name: Mukhina, Aleksandra Yu.
name: Medvedeva, Ol'ga A.
name: Shevchenko, Alina V.
name: Bobyntsev, Igor' I.
name: Kalutskiy, Pavel V.
name: Andreeva, Lyudmila A.
name: Myasoedov, Nikolay F.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: The article deals with Semax on the microecological state in colon mucosa of a rat under restraint stress. Semax was injected to Wistar male rats intraperitoneally at doses 5, 50, 150, 450 μg / kg 12-15 minutes before the start of stress. Stress led to a change in the structure of colon microbiome, due to an increase in the frequency of occurrence and the relative average for opportunistic pathogenic microorganisms. The established data indicate a significant role of restraint stress in the dysbiosis creation. Semax dosed 50 and 150 μg / kg had a corrective effect stress-induced change in the structure of colon microbiocenosis. The revealed effects of Semax can be realized due to the central and peripheral mechanisms of action of the neuropeptide. Key words: microbiocenosis, stress, gut-brain axis, immobilization, semax, stress-associated changes, colon microbiota.
Out-of-equilibrium one-dimensional disordered dipole chain
Creators: name: Dolgikh, Anton V.
name: Kosov, Daniel S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We consider a chain of one-dimensional dipole moments connected to two thermal baths with different temperatures. The system is in nonequilibrium steady state and heat flows through it. Assuming that fluctuation of the dipole moment is a small parameter, we develop an analytically solvable model for the problem. The effect of disorder is introduced by randomizing the positions of the dipole moments. We show that the disorder leads to Anderson-like transition from conducting to a thermal insulating state of the chain. It is shown that considered chain supports both ballistic and diffusive heat transports depending on the strength of the disorder. We demonstrate that nonequilibrium leads to the emergence of the long-range order between dipoles along the chain and make the conjecture that the interplay between nonequilibrium and next-to-nearest-neighbor interactions results in the emergence of long-range correlations in low-dimensional classical systems.
description: 25 pages, 10 figures
Phosphorylation of pyridoxal azomethines. Synthesis of phosphorus containing azomethines and furopyridines
Creators: name: Pudovik, Michael A.
name: Kibardina, Lyudmila
name: Trifonov, Alexey
name: Dobrynin, Alexey
name: Katsyuba, Sergei
name: Burilov, Alexander
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: New O-phosphorylated pyridoxal derivatives have been synthesized through the reaction of azomethines with РV acid chlorides. 2-Chloro-2-thioxo-5,5-dimethyl-1,3,2-dioxaphosphinanes and diethylchlorothiophosphate have been employed as phosphorylating agents. Regardless of the nature of the phosphorylating agent, the reaction is regioselective at phenolic hydroxyl group. The structure of final products is determined by the nature of the substituent at the nitrogen atom. If R is alkyl or cycloalkyl group, the products of the reaction represent phosphorylated pyridoxal imines, whereas phosphorylated furopyridines are formed in the case R is aryl substituent.
Systematic simulations of modified gravity: chameleon models
Creators: name: Brax, Philippe
name: Davis, Anne-C.
name: Li, Baojiu
name: Winther, Hans A.
name: Zhao, Gong-Bo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work we systematically study the linear and nonlinear structure formation in chameleon theories of modified gravity, using a generic parameterisation which describes a large class of models using only 4 parameters. For this we have modified the N-body simulation code ECOSMOG to perform a total of 65 simulations for different models and parameter values, including the default LCDM. These simulations enable us to explore a significant portion of the parameter space. We have studied the effects of modified gravity on the matter power spectrum and mass function, and found a rich and interesting phenomenology where the difference with the LCDM paradigm cannot be reproduced by a linear analysis even on scales as large as k~0.05h/Mpc, since the latter incorrectly assumes that the modification of gravity depends only on the background matter density. Our results show that the chameleon screening mechanism is significantly more efficient than other mechanisms such as the dilaton and symmetron, especially in high-density regions and at early times, and can serve as a guidance to determine the parts of the chameleon parameter space which are cosmologically interesting and thus merit further studies in the future.
description: 16 pages, 10 figures. Companion paper of arXiv:1206.3568. Version to appear in JCAP
title: Микросистемность топонимии как метод ее локализации и реконструкции
Creators: name: Васильев, Валерий
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2019

description: Названия населенных пунктов и водных объектов постоянно взаимодействуют, вступая в системные (деривационные) отношения. В любом регионе мира имеется много селений, которые названы по рекам и озерам, а также много рек и озер, поименованных по селениям. Результатом такого взаимодействия являются ойконимно-гидронимные микросистемы. Их анализ позволяет подразделить названия мотивирующие и мотивированные (перенесенные), определить механизмы и векторы топонимических переносов, выяснить истинный характер формантов и др. Особенную ценность приобретает диахронический анализ ойконимно-гидронимных микросистем, благодаря которому уточняются географические координаты и хронология названий, засвидетельствованных историческими источниками, и реконструируются незасвидетельствованные названия. Методика такого анализа заключается в целенаправленном поиске микросистемно связанных названий селений и водных объектов, в оценке пространственно-денотативных конфигураций обнаруженных микросистем и в восстановлении названий как недостающих, но предполагаемых элементов микросистем. В статье освещаются детали диахронического исследования названий на основе микросистемных связей, даются необходимые иллюстративные примеры. Используется топонимический материал из Новгородской и Тверской областей.