cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Lattice QCD study of the s-wave $ππ$ scattering lengths in the I=0 and 2 channels
Creators: name: Fu, Ziwen
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The s-wave pion-pion ($ππ$) scattering lengths are computed below the inelastic threshold by the Lüscher technique with pion masses ranging from 240 MeV to 463 MeV. In the Asqtad-improved staggered fermion formulation, we calculate the $ππ$ four-point functions for the I=0 and 2 channels with "moving" wall sources without gauge fixing, and analyze them at the next-to-leading order in the continuum three-flavor chiral perturbation theory. At the physical pion mass, we secure the s-wave $ππ$ scattering lengths as $m_πa_{ππ}^{I=0} = 0.214(4)(7)$ and $m_πa_{ππ}^{I=2} = -0.04430(25)(40)$ for the I=0 and 2 channels, respectively, where the first uncertainties are statistical and second ones are our estimates of several systematic effects. Our lattice results for the s-wave $ππ$ scattering lengths are in well accordance with available experimental reports and theoretical forecasts at low momentum. A basic ingredient in our study for the I=0 case is properly incorporating disconnected diagram. These lattice computations are carried out with the MILC 2+1 flavor gauge configurations at two lattice spacings $a \approx 0.15$ and 0.12 fm.
description: 24 pages
Leptonic contributions to the effective electromagnetic coupling at four-loop order in QED
Creators: name: Sturm, Christian
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The running of the effective electromagnetic coupling is for many electroweak observables the dominant correction. It plays an important role for deriving constraints on the Standard Model in the context of electroweak precision measurements. We compute the four-loop QED corrections to the running of the effective electromagnetic coupling and perform a numerical evaluation of the different gauge invariant subsets.
description: 26 pages, 4 figures
"param_card.Higgsino_155_150.dat" of "Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2019

description: SLHA file for direct Higgsino production
description: This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139/fb of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
Standard Model gauge couplings from gauge-dilatation symmetry breaking
Creators: name: Odagiri, Kosuke
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We argue that there is a spontaneously broken rotational symmetry between space-time coordinates and gauge theoretical phases. The dilatonic mode acts as the massive Higgs boson, whose vacuum expectation value determines the gauge couplings. This mechanism requires that the quadratic divergences, or tadpoles of the three gauge-theory couplings, unify at a certain scale. We verify this statement, and find that this occurs at Λ_u ~ 4x10^7 GeV. The tadpole cancellation condition, together with the dilaton self-energy, fixes the value of the unified tadpole coefficient to be 1/[4 ln(Λ_cut/Λ_u)]. The observed values of the coupling constants at Λ_u then implies Λ_cut ~ 4x10^18 GeV, which is close to the value of the reduced Planck mass MR_Pl=M_Pl/sqrt(8 pi)=2.4 x 10^18 GeV. In other words, by assuming a cutoff at M_Pl or MR_Pl, we are able to obtain predictions for the gauge couplings which agree with the true values to within a few percent. It turns out that this symmetry breaking can only take place if mass is generated with the aid of some other means such as electroweak symmetry breaking. Assuming dynamical symmetry breaking originating at MR_Pl, we obtain M_chi ~ 10^9 GeV, which is not unreasonable but somewhat higher than Λ_u. The cancellation of an anomaly in the dilaton self-energy requires that the number of fermionic generations equals three.
description: 19 pages, uses axodraw.sty
"param_card.VBF_Higgsino_100_95.dat" of "Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2019

description: SLHA file for VBF Higgsino production
description: This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139/fb of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
Comparison of the Information Technology Development in Slovakia and Hungary
Creators: name: Sasvari, Peter
name: Majoros, Zsuzsa
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Nowadays the role of information is increasingly important, so every company has to provide the efficient procurement, processing, storage and visualization of this special resource in hope to stay competitive. More and more enterprises introduce Enterprise Resource Planning System to be able to perform the listed functions. The article illustrates the usage of these systems in Hungary and Slovakia, as well as tests the following presumption: the level of Information Technology (IT) development is lower in Hungary than our northern neighbor.
description: 6 pages, 3 figures
"param_card.SlepSlep_150_140.dat" of "Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2019

description: SLHA file for direct Slepton production
description: This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139/fb of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
"EwkCompressedVBF2018.cxx" of "Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2019

description: Example code for selecting events in the VBF channels.
description: This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139/fb of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
Resonant valley filtering of massive Dirac electrons
Creators: name: Moldovan, D.
name: Masir, M. Ramezani
name: Covaci, L.
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electrons in graphene, in addition to their spin, have two pseudospin degrees of freedom: sublattice and valley pseudospin. Valleytronics uses the valley degree of freedom as a carrier of information similar to the way spintronics uses electron spin. We show how a double barrier structure consisting of electric and vector potentials can be used to filter massive Dirac electrons based on their valley index. We study the resonant transmission through a finite number of barriers and we obtain the energy spectrum of a superlattice consisting of electric and vector potentials. When a mass term is included the energy bands and energy gaps at the K and K' points are different and they can be tuned by changing the potential.
description: 20 figures
A review on solar wind modeling: kinetic and fluid aspects
Creators: name: Echim, Marius
name: Lemaire, Joseph
name: Lie-Svendsen, Oystein
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We review the main advantages and limitations of the kinetic exospheric and fluid models of the solar wind (SW). We discuss the hydrostatic model imagined by Chapman, the first supersonic hydrodynamic models published by Parker and the first generation subsonic kinetic model proposed by Chamberlain. It is shown that a correct estimation of the electric field as in the second generation kinetic exospheric models developed by Lemaire and Scherer, provides a supersonic expansion of the corona, reconciling the hydrodynamic and the kinetic approach. The third generation kinetic exospheric models considers kappa velocity distribution function (VDF) instead of a Maxwellian at the exobase and in addition they treat a non-monotonic variation of the electric potential with the radial distance; the fourth generation exospheric models include Coulomb collisions based on the Fokker--Planck collision term. Multi-fluid models of the solar wind provide a coarse grained description and reproduce with success the spatio-temporal variation of SW macroscopic properties (density, bulk velocity). The main categories of multi-fluid SW models are reviewed: the 5-moment, or Euler, models, originally proposed by Parker to describe the supersonic SW expansion; the 8-moment and 16-moment fluid models, the gyrotropic approach with improved collision terms as well as the gyrotropic models based on observed VDFs. The outstanding problem of collisions, including the long range Coulomb encounters, is also discussed, both in the kinetic and multi-fluid context. Although for decades the two approaches have been seen as opposed, in this paper we emphasize their complementary. The review of the kinetic and fluid models of the solar wind contributes also to a better evaluation of the open questions still existent in SW modeling and suggests possible future developments.
Evidence of a critical hole concentration in underdoped YBa$_2$Cu$_3$O$_y$ single crystals revealed by $^{63}$Cu NMR
Creators: name: Baek, S. -H.
name: Loew, T.
name: Hinkov, V.
name: Lin, C. T.
name: Keimer, B.
name: Büchner, B.
name: Grafe, H. -J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report a $^{63}$Cu NMR investigation in detwinned YBa$_2$Cu$_3$O$_y$ single crystals, focusing on the highly underdoped regime (y=6.35-6.6). Measurements of both the spectra and the spin-lattice relaxation rates of $^{63}$Cu uncover the emergence of static order at a well-defined onset temperature $T_0$ without a known order parameter as yet. While $T_0$ is rapidly suppressed with increasing hole doping concentration $p$, the spin pseudogap was identified only near and above the doping content at which $T_0\rightarrow 0$. Our data indicate the presence of a critical hole doping $p_c\sim 0.1$, which may control both the static order at $pp_c$.
description: 5 pages, 4 figures, accepted as a Rapid Communication in PRB
Non-conventional Anderson localization in a matched quarter stack with metamaterials
Creators: name: Torres-Herrera, E. J.
name: Izrailev, F. M.
name: Makarov, N. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the problem of non-conventional Anderson localization emerging in bilayer periodic-on-average structures with alternating layers of materials with positive and negative refraction indices $n_a$ and $n_b$. Main attention is paid to the model of the so-called quarter stack with perfectly matched layers (the same unperturbed by disorder impedances, $Z_a=Z_b$, and optical path lengths, $n_ad_a=|n_b| d_b$, with $d_a$, $d_b$ being the thicknesses of basic layers). As was recently numerically discovered, in such structures with weak fluctuations of refractive indices (compositional disorder) the localization length $L_{loc}$ is enormously large in comparison with the conventional localization occurring in the structures with positive refraction indices only. In this paper we develop a new approach which allows us to derive the expression for $L_{loc}$ for weak disorder and any wave frequency $ω$. In the limit $ω\rightarrow 0$ one gets a quite specific dependence, $L^{-1}_{loc}\proptoσ^4ω^8$ which is obtained within the fourth order of perturbation theory. We also analyze the interplay between two types of disorder, when in addition to the fluctuations of $n_a$, $n_b$ the thicknesses $d_a$, $d_b$ slightly fluctuate as well (positional disorder). We show how the conventional localization recovers with an addition of positional disorder.
description: 23 pages, 7 figures
Homogeneous bubble nucleation in water at negative pressure: A Voronoi polyhedra analysis
Creators: name: Abascal, Jose L. F.
name: Gonzalez, Miguel A.
name: Aragones, Juan L.
name: Valeriani, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We investigate vapor bubble nucleation in metastable TIP4P/2005 water at negative pressure via the Mean First Passage Time (MFPT) method using the volume of the largest bubble as a local order parameter. We identify the bubbles in the system by means of a Voronoi-based analysis of the Molecular Dynamics trajectories. By comparing the features of the tessellation of liquid water at ambient conditions to those of the same system with an empty cavity we are able to discriminate vapor (or interfacial) molecules from the bulk ones. This information is used to follow the time evolution of the largest bubble until the system cavitates at 280 K above and below the spinodal line. At the pressure above the spinodal line, the MFPT curve shows the expected shape for a moderately metastable liquid from which we estimate the bubble nucleation rate and the size of the critical cluster. The nucleation rate estimated using Classical Nucleation Theory turns out to be about 8 order of magnitude lower than the one we compute by means of MFPT. The behavior at the pressure below the spinodal line, where the liquid is thermodynamically unstable, is remarkably different, the MFPT curve being a monotonous function without any inflection point.
Active inductor shunt peaking in high-speed VCSEL driver design
Creators: name: Liang, Futian
name: Gong, Datao
name: Hou, Suen
name: Liu, Chonghan
name: Liu, Tiankuan
name: Su, Da-Shung
name: Teng, Ping-Kun
name: Xiang, Annie
name: Ye, Jingbo
name: Jin, Ge
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: An all transistor active inductor shunt peaking structure has been used in a prototype of 8-Gbps high-speed VCSEL driver which is designed for the optical link in ATLAS liquid Argon calorimeter upgrade. The VCSEL driver is fabricated in a commercial 0.25-um Silicon-on-Sapphire (SoS) CMOS process for radiation tolerant purpose. The all transistor active inductor shunt peaking is used to overcome the bandwidth limitation from the CMOS process. The peaking structure has the same peaking effect as the passive one, but takes a small area, does not need linear resistors and can overcome the process variation by adjust the peaking strength via an external control. The design has been tapped out, and the prototype has been proofed by the preliminary electrical test results and bit error ratio test results. The driver achieves 8-Gbps data rate as simulated with the peaking. We present the all transistor active inductor shunt peaking structure, simulation and test results in this paper.
description: 4 pages, 6 figures and 1 table, Submitted to 'Chinese Physics C'
Hubble Space Telescope Imaging of the Binary Nucleus of the Planetary Nebula EGB 6
Creators: name: Liebert, James
name: Bond, Howard E.
name: Dufour, P.
name: Ciardullo, Robin
name: Meakes, Michael G.
name: Renzini, Alvio
name: Gianninas, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: EGB 6 is an ancient, low-surface-brightness planetary nebula. The central star, also cataloged as PG 0950+139, is a very hot DAOZ white dwarf (WD) with an apparent M dwarf companion, unresolved from the ground but detected initially through excesses in the JHK bands. Its kinematics indicates membership in the Galactic disk population. Inside of EGB 6 is an extremely dense emission knot -- completely unexpected since significant mass loss from the WD should have ceased ~10^5 y ago. The electron density of the compact nebula is very high (2.2x10^6 cm^-3), as indicated by collisional de-excitation of forbidden emission lines. Hubble Space Telescope imaging and grism spectroscopy are reported here. These resolve the WD and apparent dM companion -- at a separation of 0."166, or a projected 96(+204,-45) AU at the estimated distance of 576(+1224, -271) pc (using the V magnitude). Much to our surprise, we found that the compact emission nebula is superposed on the dM companion, far from the photoionizing radiation of the WD. Moreover, a a striking mid-infrared excess has recently been reported in Spitzer/IRAC and MIPS bands, best fit with two dust shells. The derived ratio L_IR/L_WD = 2.7 x 10^-4 is the largest yet found for any WD or planetary nucleus. The compact nebula has maintained its high density for over three decades. We discuss two possible explanations for the origin and confinement of the compact nebula, neither of which is completely satisfactory. This leaves the genesis and confinement of the compact nebula an astrophysical puzzle, yet similar examples appear in the literature.
description: Accepted for the Astrophysical Journal, in press
"EwkCompressed2018.cxx" of "Searches for electroweak production of supersymmetric particles with compressed mass spectra in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"
Creators: name: ATLAS Collaboration
Publisher: name: HEPData
Year: 2019

description: Example code for selecting events in the non-VBF channels.
description: This paper presents results of searches for electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139/fb of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low transverse momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 GeV to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 GeV to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
Advantage in the discrete Voronoi game
Creators: name: Gerbner, Dániel
name: Mészáros, Viola
name: Pálvölgyi, Dömötör
name: Pokrovskiy, Alexey
name: Rote, Günter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We study the discrete Voronoi game, where two players alternately claim vertices of a graph for t rounds. In the end, the remaining vertices are divided such that each player receives the vertices that are closer to his or her claimed vertices. We prove that there are graphs for which the second player gets almost all vertices in this game, but this is not possible for bounded-degree graphs. For trees, the first player can get at least one quarter of the vertices, and we give examples where she can get only little more than one third of them. We make some general observations, relating the result with many rounds to the result for the one-round game on the same graph.
Tracing cross-free polylines oriented by a N-symmetry direction field on triangulated surfaces
Creators: name: Ray, Nicolas
name: Sokolov, Dmitry
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: We propose an algorithm for tracing polylines on a triangle mesh such that: they are aligned with a N-symmetry direction field, and two such polylines cannot cross or merge. This property is fundamental for mesh segmentation and is very difficult to enforce with numerical integration of vector fields. We propose an alternative solution based on "stream-mesh", a new combinatorial data structure that defines, for each point of a triangle edge, where the corresponding polyline leaves the triangle. It makes it possible to trace polylines by iteratively crossing triangles. Vector field singularities and polyline/vertex crossing are characterized and consistently handled. The polylines inherits the cross-free property of the stream-mesh, except inside triangles where avoiding local overlaps would require higher order polycurves.
Towards Physarum Engines
Creators: name: Tsuda, Soichiro
name: Jones, Jeff
name: Adamatzky, Andrew
Publisher: name: arXiv
Year: 2012
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Emerging Technologies (cs.ET)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The slime mould Physarum polycephalum is a suitable candidate organism for soft-matter robotics because it exhibits controllable transport, movement and guidance behaviour. Physarum may be considered as a smart computing and actuating material since both its motor and control systems are distributed within its undifferentiated tissue and can survive trauma such as excision, fission and fusion of plasmodia. Thus it may be suitable for exploring the generation and distribution of micro-actuation in individual units or planar arrays. We experimentally show how the plasmodium of Physarum is shaped to execute controllable oscillatory transport behaviour applicable in small hybrid engines. We measure the lifting force of the plasmodium and demonstrate how protoplasmic transport can be influenced by externally applied illumination stimuli. We provide an exemplar vehicle mechanism by coupling the oscillations of the plasmodium to drive the wheels of a Braitenberg vehicle and use light stimuli to effect a steering mechanism. Using a particle model of Physarum we show how emergent travelling wave patterns produced by competing oscillatory domains may be used to to generate spatially represented actuation patterns. We demonstrate different patterns of controllable motion, including linear, reciprocal, rotational and helical, and demonstrate in simulation how dynamic oscillatory patterns may be translated into motive forces for simple transport of substances within a patterned environment.
description: arXiv admin note: text overlap with arXiv:1212.0023
МОНИТОРИНГОВЫЕ ИССЛЕДОВАНИЯ НАЛЕДЕЙ В БАССЕЙНАХ МАЛЫХ РЕК ЦЕНТРАЛЬНОЙ ЧАСТИ СЕЛЕНГИНСКОГО СРЕДНЕГОРЬЯ
Creators: name: В.Н. Черных
name: Е.Ж. Гармаев
Publisher: name: Проблемы региональной экологии
Year: 2023
Subjects: наледи
многолетняя мерзлота
малые реки
Селенгинское среднегорье
Landsat
динамика
климат
осадки
температура воздуха.
icings
permafrost
small rivers
the Selenga Highlands
dynamics
climate
precipitation
air temperature

description: В работе представлены результаты мониторинга и комплексного изучения наледей в центральной части Селенгинского среднегорья. Район исследования включает семь малых водосборных бассейнов. На основе анализа данных космической съемки Landsat и Sentinel за период с 1988 по 2023 г. с привлечением материалов полевых экспедиционных исследований (2020—2023 гг.) выявлены общие особенности межгодовой и многолетней изменчивости наледей. Установлено, что в пределах района исследования, в зависимости от природно-климатической обстановки, формируется от 50 до 150 наледей, большинство из которых имеют площади в пределах от 10 до 100 тыс. м2. Наледи отличаются выраженной пространственной динамикой, а также цикличностью роста и сокращения площадей. Максимальная суммарная площадь наледей на территории достигает 6,5 км2, минимальная составляет 1 км2. За последние 30 лет в изменении площадей наледей наблюдается отрицательный тренд. Выявлена зависимость морфометрии наледей от основных метеорологических показателей, рассмотрены гидрологические угрозы.
description: The paper presents the results of monitoring and comprehensive study of icings in the central part of the Selenga Highlands. The study area includes 7 small watersheds. Based on the analysis of Landsat and Sentinel satellite imagery data for the period from 1988 to 2023, involving the data of field expeditionary studies (2020—2023), the general features of the interannual and long-term variability of the icings were revealed. It was found that within the study area, depending on the natural and climatic conditions, from 50 to 150 icings are formed, most of which have an area from 10 to 100 thousand m2. The icings are distinguished by spatial dynamics, as well as by cyclic growth and reduction of the area. The maximum total area of the icings in the territory reaches 6.5 km2, the minimum is 1 km2. Over the last 30 years, a negative trend is observed in the changes of the icings areas. The dependence of the icings morphometry on the main meteorological indicators is revealed, and the hydrological threats are considered.
Ramanujan-type Congruences for Broken 2-Diamond Partitions Modulo 3
Creators: name: Chen, William Y. C.
name: Fan, Anna R. B.
name: Yu, Rebecca T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 05A17, 11P83

description: The notion of broken $k$-diamond partitions was introduced by Andrews and Paule. Let $Δ_k(n)$ denote the number of broken k-diamond partitions of $n$. They also posed three conjectures on the congruences of $Δ_2(n)$ modulo 2, 5 and 25. Hirschhorn and sellers proved the conjectures for modulo 2, and Chan proved cases of modulo 5. For the case of modulo 3, Radu and Sellers obtained an infinite family of congruences for $Δ_2(n)$. In this paper, we obtain two infinite families of congruences for $Δ_2(n)$ modulo 3 based on a formula of Radu and Sellers, the 3-dissection formula of the generating function of triangular number due to Berndt, and the properties of the $U$-operator, the $V$-operator, the Hecke operator and the Hecke eigenform. For example, we find that $Δ_2(243n+142)\equiv Δ_2(243n+223)\equiv0\pmod{3}$. The infinite family of Radu and Sellers and the two infinite families derived in this paper have two congruences in common, namely, $Δ_2(27n+16)\equivΔ_2(27n+25)\equiv0 \pmod{3}$.
description: 10 pages, 3 figures
Sonnenfleckenzeichnung Nr. 31.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.02.2016, 08:00, erstellt von Marco Cagnotti
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 4.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
Sonnenfleckenzeichnung Nr. 101.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 17.05.2016, 08:00, erstellt von Sergio Cortesi
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 3.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
title: Ψηφιακό Μάρκετινγκ στις δημόσιες υπηρεσίες-Η περίπτωση της Περιφερειακής Ενότητας Χανίων
title: Digital Marketing in state services -the case of Chania Reginal Unit
Creators: name: Τακου Βασιλικη
Publisher: name: Technical University of Crete
Year: 2023

description: Οι σύγχρονες τεχνολογίες, η συνεχής σύνδεση στο διαδίκτυο διαμόρφωσαν μια ψηφιακή κοινωνία, όπου η επικοινωνία, οι σχέσεις και κάθε είδους δραστηριότητα πραγματοποιούνται περισσότερο διαδικτυακά παρά στο παραδοσιακό φυσικό περιβάλλον. Αυτή η ψηφιακή εξέλιξη έχει επηρεάσει εκτεταμένα και τον τρόπο λειτουργίας των δημόσιων υπηρεσιών Οι δημόσιες υπηρεσίες έχουν ψηφιοποιηθεί μερικώς για να είναι πιο προσβάσιμες και αποτελεσματικές για τους πολίτες.
Στο πρώτο σκέλος αυτής της εργασίας (κεφάλαιο 1ο) έγινε μια ανασκόπηση της εξέλιξης του μάρκετινγκ από τις αρχές του 20ού αιώνα μέχρι σήμερα. Εξετάσαμε πως οι πρακτικές μάρκετινγκ έχουν αλλάξει και έχουν προσαρμοστεί στις αλλαγές της τεχνολογίας και της κοινωνίας. Στη συνέχεια(κεφάλαιο 2ο) μελετήσαμε όλες τις πτυχές του ψηφιακού μάρκετινγκ. Εξετάσαμε θέματα όπως η χρήση δικτυακών ιστοτόπων, μηχανές αναζήτησης, μέσα κοινωνικής δικτύωσης, η διαφήμιση στα μέσα κοινωνικής δικτύωσης η δημιουργία περιεχομένου στο διαδίκτυο και οι τεχνικές SEO.
Στο δεύτερο σκέλος(Κεφάλαιο 3ο) εξετάσαμε το Δημόσιο τομέα, αποτυπώνοντας την οριοθέτηση του και τα χαρακτηριστικά που διέπουν τις δημόσιες υπηρεσίες ώστε να ερευνήσουμε την δυνατότητα υιοθέτησης των στρατηγικών μάρκετινγκ από αυτές.
Στο τρίτο σκέλος(Κεφάλαιο 4ο) μελετήσαμε τη θεσμική διαδρομή των Περιφερειών, τα όργανα τους καθώς και την διάρθρωση της Περιφερειακής Ενότητας Χανίων και πραγματοποιήθηκε εκτενής μελέτη των εργαλείων ψηφιακού μάρκετινγκ που κάνουν χρήση οι Περιφέρειες της Χώρας και οι αντίστοιχες Περιφερειακές Ενότητες που ανήκουν στην χωρική αρμοδιότητα τους.
Στο τέταρτο σκέλος (Κεφάλαιο 5ο) πραγματοποιήθηκε έρευνα στους Κατοίκους του νομού Χανίων για να διαπιστωθεί πόσο οι κάτοικοι του νομού Χανίων χρησιμοποιούν ψηφιακά εργαλεία μάρκετινγκ, ποια είναι η στάση των κατοίκων για τα ψηφιακά εργαλεία που κάνει χρήση η Περιφέρεια Κρήτης και ποια είναι η άποψη τους ως προς την στάση της Π.Ε.Χ. στα ψηφιακά εργαλεία μάρκετινγκ.
Στο τελευταίο σκέλος(Κεφάλαιο 6ο) παραθέτουμε συμπερασματικά το μέγεθος της διείσδυσης του ψηφιακού μάρκετινγκ στις δημόσιες υπηρεσίες και δη στις Περιφέρειες της Χώρας, την στάση των κατοίκων του νομού Χανίων στο ψηφιακό μάρκετινγκ και κλείνουμε με προτάσεις στρατηγικής για τη βελτίωση της διείσδυσης του ψηφιακού μάρκετινγκ στην Περιφέρεια Κρήτης.
FitSKIRT: genetic algorithms to automatically fit dusty galaxies with a Monte Carlo radiative transfer code
Creators: name: De Geyter, Gert
name: Baes, Maarten
name: Fritz, Jacopo
name: Camps, Peter
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present FitSKIRT, a method to efficiently fit radiative transfer models to UV/optical images of dusty galaxies. These images have the advantage that they have better spatial resolution compared to FIR/submm data. FitSKIRT uses the GAlib genetic algorithm library to optimize the output of the SKIRT Monte Carlo radiative transfer code. Genetic algorithms prove to be a valuable tool in handling the multi- dimensional search space as well as the noise induced by the random nature of the Monte Carlo radiative transfer code. FitSKIRT is tested on artificial images of a simulated edge-on spiral galaxy, where we gradually increase the number of fitted parameters. We find that we can recover all model parameters, even if all 11 model parameters are left unconstrained. Finally, we apply the FitSKIRT code to a V-band image of the edge-on spiral galaxy NGC4013. This galaxy has been modeled previously by other authors using different combinations of radiative transfer codes and optimization methods. Given the different models and techniques and the complexity and degeneracies in the parameter space, we find reasonable agreement between the different models. We conclude that the FitSKIRT method allows comparison between different models and geometries in a quantitative manner and minimizes the need of human intervention and biasing. The high level of automation makes it an ideal tool to use on larger sets of observed data.
description: 14 pages, 10 figures; accepted for publication in Astronomy and Astrophysics
Sonnenfleckenzeichnung Nr. 47.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 06.03.2016, 10:45, erstellt von Andrea Manna
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 3.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
Controlling active self-assembly through broken particle symmetries
Creators: name: Wensink, H. H.
name: Kantsler, V.
name: Goldstein, R. E.
name: Dunkel, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Many structural properties of conventional passive materials are known to arise from the symmetries of their microscopic constituents. By contrast, it is largely unclear how the interplay between cell shape and self-propulsion controls the meso- and macroscale behavior of active matter. Here, we analyze large-scale simulations of homo- and heterogeneous self-propelled particle systems to identify generic effects of broken particle symmetry on collective motion. We find that even small violations of fore-aft symmetry lead to fundamentally different collective behaviors, which may facilitate demixing of differently shaped species as well as the spontaneous formation of stable micro-rotors. These results suggest that variation of particle shape yields robust physical mechanisms to control self-assembly of active matter, with possibly profound implications for biology and materials design.
description: 5 pages, 4 figures
Sonnenfleckenzeichnung Nr. 17.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 25.01.2016, 09:30, erstellt von Marco Cagnotti
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 3.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
Focal Plane Wavefront Sensing using Residual Adaptive Optics Speckles
Creators: name: Codona, Johanan L.
name: Kenworthy, Matthew
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Optical imperfections, misalignments, aberrations, and even dust can significantly limit sensitivity in high-contrast imaging systems such as coronagraphs. An upstream deformable mirror (DM) in the pupil can be used to correct or compensate for these flaws, either to enhance Strehl ratio or suppress residual coronagraphic halo. Measurement of the phase and amplitude of the starlight halo at the science camera is essential for determining the DM shape that compensates for any non-common-path (NCP) wavefront errors. Using DM displacement ripples to create a series of probe and anti-halo speckles in the focal plane has been proposed for space-based coronagraphs and successfully demonstrated in the lab. We present the theory and first on-sky demonstration of a technique to measure the complex halo using the rapidly-changing residual atmospheric speckles at the 6.5m MMT telescope using the Clio mid-IR camera. The AO system's wavefront sensor (WFS) measurements are used to estimate the residual wavefront, allowing us to approximately compute the rapidly-evolving phase and amplitude of speckle halo. When combined with relatively-short, synchronized science camera images, the complex speckle estimates can be used to interferometrically analyze the images, leading to an estimate of the static diffraction halo with NCP effects included. In an operational system, this information could be collected continuously and used to iteratively correct quasi-static NCP errors or suppress imperfect coronagraphic halos.
description: Astrophysical Journal (accepted). 26 pages, 21 figures
Sonnenfleckenzeichnung Nr. 180.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 15.08.2016, 09:15, erstellt von Andrea Manna
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 4.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
The Age and Stellar Parameters of the Procyon Binary System
Creators: name: Liebert, James
name: Fontaine, Gilles
name: Young, Patrick A.
name: Williams, Kurtis A.
name: Arnett, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Procyon AB binary system (orbital period 40.838 years, a newly-refined determination), is near and bright enough that the component radii, effective temperatures, and luminosities are very well determined, although more than one possible solution to the masses has limited the claimed accuracy. Preliminary mass determinations for each component are available from HST imaging, supported by ground-based astrometry and an excellent Hipparcos parallax; we use these for our preferred solution for the binary system. Other values for the masses are also considered. We have employed the TYCHO stellar evolution code to match the radius and luminosity of the F5 IV-V primary star to determine the system's most likely age as 1.87 +/- 0.13 Gyr. Since prior studies of Procyon A found its abundance indistinguishable from solar, the solar composition of Asplund, Grevesse & Sauval (Z=0.014) is assumed for the HR Diagram flitting. An unsuccessful attempt to fit using the older solar abundance scale of Grevesse & Sauval (Z=0.019) is also reported. For Procyon B, eleven new sequences for the cooling of non-DA white dwarfs have been calculated, to investigate the dependence of the cooling age on (1) the mass, (2) the core composition, (3) the helium layer mass, and (4) heavy-element opacities in the helium envelope. Our calculations indicate a cooling age of 1.19+/-0.11 Gyr, which implies that the progenitor mass of Procyon B was 2.59(+0.44,-0.26) Msun. In a plot of initial vs final mass of white dwarfs in astrometric binaries or star clusters (all with age determinations), the Procyon B final mass lies several sigma below a straight line fit.
description: Accepted for the Astrophysical Journal, in press
Sonnenfleckenzeichnung Nr. 271.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 22.12.2016, 09:00, erstellt von Marco Cagnotti
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 3.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)
Sonnenfleckenzeichnung Nr. 21.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 29.01.2016, 08:00, erstellt von Marco Cagnotti
Creators: name: Observatorium Specola Solare Ticinese Locarno (1957 bis 1980 Teil der Eidgenössischen Sternwarte der ETH Zürich)
Publisher: name: [s.n.]
Year: 2016

description: Bleistiftzeichnung mit schwarzer Farbe und Bleistift, erstellt als Projektionsbildzeichnung für die Beobachtungen in Locarno-Monti auf einem eigenen Vordruck. Instrument: Zeiss-Coudé-Refraktor mit 15 cm Öffnung und 225 cm Brennweite. Bildqualität (SIDC): 3.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden auf dem Vordruck eingetragen. Zusätzlich sind zuhanden der späteren statistischen Verarbeitung die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Beobachtungstätigkeit unter eigenständiger Leitung (Associazione Specola Solare Ticinese ASST)