cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Loop quantum cosmology of Bianchi IX: Inclusion of inverse triad corrections
Creators: name: Corichi, Alejandro
name: Karami, Asieh
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the loop quantization of the (diagonal) Bianchi type IX cosmological model. We explore different quantization prescriptions that extend the work of Wilson-Ewing and Singh. In particular, we study two different ways of implementing the so-called inverse triad corrections. We construct the corresponding Hamiltonian constraint operators and show that the singularity is formally resolved. We find the effective equations associated with the different quantization prescriptions, and study the relation with the isotropic $k$=1 model that, classically, is contained within the Bianchi IX model. We use geometrically defined scalar observables to explore the physical implications of each of these theories. This is the first part in a series of papers analyzing different aspects of the Bianchi IX model, with inverse corrections, within loop quantum cosmology.
description: 18 pages, 2 figures. Prepared for the special issue on Loop Quantum Cosmology of the International Journal of Modern Physics D
Morelli, Umberto; Sondel-Cedarmas, Joanna (2022). Storia dell’integrazione europea. Nuova edizione, Milano: Edizioni Angelo Guerini e Associati, 350 pp.
Creators: name: Piccardo, Lara
Publisher: name: De Europa
Year: 2023

description: De Europa, Vol. 6 No. 1 (2023)
Dynamic heterogeneity in two-dimensional supercooled liquids: comparison of bond-breaking and bond-orientational correlations
Creators: name: Flenner, Elijah
name: Szamel, Grzegorz
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We compare the spatial correlations of bond-breaking events and bond-orientational relaxation in a model two-dimensional liquid undergoing Newtonian dynamics. We find that the relaxation time of the bond-breaking correlation function is much longer than the relaxation time of the bond-orientational correlation function and self-intermediate scattering function. However, the relaxation time of the bond-orientational correlation function increases faster with decreasing temperature than the relaxation time of the bond-breaking correlation function and the self-intermediate scattering function. Moreover, the dynamic correlation length that characterizes the size of correlated bond-orientational relaxation grows faster with decreasing temperature than the dynamic correlation length that characterizes the size of correlated bond-breaking events. We also examine the ensemble-dependent and ensemble-independent dynamic susceptibilities for both bond-breaking correlations and bond-orientational correlations. We find that for both correlations, the ensemble-dependent and ensemble-independent susceptibilities exhibit a maximum at nearly the same time, and this maximum occurs at a time slightly shorter than the peak position of the dynamic correlation length.
Electronic and magnetic properties of dopant atoms in SnSe monolayer: a first-principles study
Creators: name: Wang, Qingxia
name: Yu, Weiyang
name: Fu, Xiaonan
name: Qiao, Chong
name: Xia, Congxin
name: Jia, Yu
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: SnSe monolayer with orthorhombic Pnma GeS structure is an important two-dimensional (2D) indirect band gap material at room temperature. Based on first-principles density functional theory calculations, we present systematic studies on the electronic and magnetic properties of X (X = Ga, In, As, Sb) atoms doped SnSe monolayer. The calculated electronic structures show that Ga-doped system maintains semiconducting property while In-doped SnSe monolayer is half-metal. The As- and Sb- doped SnSe systems present the characteristics of n-type semiconductor. Moreover, all considered substitutional doping cases induce magnetic ground states with the magnetic moment of 1μB. In addition, the calculated formation energies also show that four types of doped systems are thermodynamic stable. These results provide a new route for the potential applications of doped SnSe monolayer in 2D photoelectronic and magnetic semiconductor devices.
description: 7 pages, 9 figures
Supplementary information regarding the calibration/ verification of hardness testing machines : Guideline DKD-R 9-3
Creators: name: Baumann, Stephan
name: Beisel, Peter
name: Buchmann, Frank
name: Ellermeier, Jörg
name: Gerber, Siegfried
name: Hauck, Benjamin
name: Herzog, Silvio
name: Höll, Robert
name: Karl, Gerd
name: Latzke, Sascha
name: Licht, Rudenz
name: Menelao, Febo
name: Musmann, Michael
name: Neumann, Steffen
name: Nimptsch, Daniel
name: Nowaczyk, Dirk
name: Reinold, Helge
name: Reinstädt, Philipp
name: Ruppel, David
name: Sawla, Amritlal
name: Schulz, Jörg
name: Steiner, Jörg
name: Uebach, Andreas
name: Wehr, Jörn
name: Wirth, Oliver
name: Wolf, Pedro
name: Worthmann, Mike
Publisher: name: Physikalisch-Technische Bundesanstalt (PTB)
Year: 2023
Subjects: DKD Guideline
hardness testing machine
DIN EN ISO 6506-2
DIN EN ISO 6507-2
DIN EN ISO 6508-2

description: The specifications of this guideline aim to support the accredited calibration laboratories in applying the calibration standards DIN EN ISO 6506-2, DIN EN ISO 6507-2 and DIN EN ISO 6508-2 for the calibration and verification of hardness testing machines in a comparable and reliable manner. The guideline directly addresses particularly important or unclearly defined points of the above-mentioned standards.
Bericht über die Situation des chinesischen Christentums außerhalb Chinas
Creators: name: Charbonnier, Jean
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 15 Nr. 6/7 (1979): Concilium: Internationale Zeitschrift für Theologie, Band 15, Heft 6/7
Manipulation of polarization and spatial properties of light beams with chiral metafilms
Creators: name: Klimov, V. V.
name: Zabkov, I. V.
name: Pavlov, A. A.
name: Shiu, R. -C.
name: Chan, H. -C.
name: Guo, G. Y.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Two-dimensional lattices of chiral nanoholes in a plasmonic film with lattice constants being slightly larger than light wavelength are proposed for effective control of polarization and spatial properties of light beams. Effective polarization conversion and strong circular dichroism in non-zero diffraction orders in these chiral metafilms are demonstrated by electromagnetic simulations. These interesting effects are found to result from interplay between radiation pattern of single chiral nanohole and diffraction pattern of the planar lattice, and can be manipulated by varying wavelength and polarization of incoming light as well as period of metastructure and refractive indexes of substrate and overlayer. Therefore, this work offers a novel paradigm for developing planar chiral metafilm-based optical devices with controllable polarization state, spatial orientation and intensity of outgoing light.
Liquid and solid phases of 3He on graphite
Creators: name: Gordillo, M. C.
name: Boronat, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Recent heat-capacity experiments show quite unambiguously the existence of a liquid $^3$He phase adsorbed on graphite. This liquid is stable at an extremely low density, possibly one of the lowest found in Nature. Previous theoretical calculations of the same system, and in strictly two dimensions, agree with the result that this liquid phase is not stable and the system is in the gas phase. We calculated the phase diagram of normal $^3$He adsorbed on graphite at $T=0$ using quantum Monte Carlo methods. Considering a fully corrugated substrate we observe that at densities lower that 0.006 Å$^{-2}$ the system is a very dilute gas, that at that density is in equilibrium with a liquid of density 0.014 Å$^{-2}$. Our prediction matches very well the recent experimental findings on the same system. On the contrary, when a flat substrate is considered, no gas-liquid coexistence is found, in agreement with previous calculations. We also report results on the different solid structures, and the corresponding phase transitions that appear at higher densities.
description: 5 pages
Modeling the early multiwavelength emission in GRB130427A
Creators: name: Fraija, Nissim
name: Lee, William H.
name: Veres, Péter
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: One of the most powerful gamma-ray bursts, GRB 130427A was swiftly detected from GeV $γ$-rays to optical wavelengths. In the GeV band, the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope observed the highest-energy photon ever recorded of 95 GeV, and a bright peak in the early phase followed by emission temporally extended for more than 20 hours. In the optical band, a bright flash with a magnitude of $7.03\pm 0.03$ in the time interval from 9.31 s to 19.31 s after the trigger was reported by RAPTOR in r-band. We study the origin of the GeV $γ$-ray emission, using the multiwavelength observation detected in X-ray and optical bands. The origin of the temporally extended LAT, X-ray and optical flux is naturally interpreted as synchrotron radiation and the 95-GeV photon and the integral flux upper limits placed by the HAWC observatory are consistent with synchrotron self-Compton from an adiabatic forward shock propagating into the stellar wind of its progenitor. The extreme LAT peak and the bright optical flash are explained through synchrotron self-Compton and synchrotron emission from the reverse shock, respectively, when the ejecta evolves in thick-shell regime and carries a significant magnetic field.
description: Accepted in ApJ (10 Pages, 4 figures)
Non-parametric reconstruction of cosmological matter perturbations
Creators: name: Gonzalez, J. E.
name: Alcaniz, J. S.
name: Carvalho, J. C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Perturbative quantities, such as the growth rate ($f$) and index ($γ$), are powerful tools to distinguish different dark energy models or modified gravity theories even if they produce the same cosmic expansion history. In this work, without any assumption about the dynamics of the Universe, we apply a non-parametric method to current measurements of the expansion rate $H(z)$ from cosmic chronometers and high-$z$ quasar data and reconstruct the growth factor and rate of linearised density perturbations in the non-relativistic matter component. Assuming realistic values for the matter density parameter $Ω_{m0}$, as provided by current CMB experiments, we also reconstruct the evolution of the growth index $γ$ with redshift. We show that the reconstruction of current $H(z)$ data constrains the growth index to $γ=0.56 \pm 0.12$ (2$σ$) at $z = 0.09$, which is in full agreement with the prediction of the $Λ$CDM model and some of its extensions.
description: 7 pages, 5 figures, LaTeX
Acoustic cavitation induced by cylindrical probes working at 24 kHz
Creators: name: Gianmaria, Viciconte
Publisher: name: KAUST Research Repository
Year: 2024

description: High-speed imaging (200,000 fps) of the acoustic cavitation activity induced by probes vibrating at 24 kHz. The videos are related to cylindrical probes having two different diameters: 7 mm and 14 mm. The shadow of the probes and the evolution of the vapor phase, generated below the tip, are visible in the videos.
Composite operators and form factors in N=4 SYM
Creators: name: Chicherin, Dmitry
name: Sokatchev, Emery
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct the most general composite operators of N = 4 SYM in Lorentz harmonic chiral ($\approx$ twistor) superspace. The operators are built from the SYM supercurvature which is nonpolynomial in the chiral gauge prepotentials. We reconstruct the full nonchiral dependence of the supercurvature. We compute all tree-level MHV form factors via the LSZ redcution procedure with on-shell states made of the same supercurvature.
description: 32 pages
Double Soft Theorems and Shift Symmetry in Nonlinear Sigma Models
Creators: name: Low, Ian
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show both the leading and subleading double soft theorems of the nonlinear sigma model follow from a shift symmetry enforcing Adler's zero condition in the presence of an unbroken global symmetry. They do not depend on the underlying coset G/H and are universal infrared behaviors of Nambu-Goldstone bosons. Although nonlinear sigma models contain an infinite number of interaction vertices, the double soft limit is determined entirely by a single four-point interaction, together with the existence of Adler's zeros.
description: 14 pages
The Bianchi type-V Dark Energy Cosmology in Self Interacting Brans Dicke Theory of Gravity
Creators: name: Singh, J. K.
name: Rani, Sarita
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper deals with a spatially homogeneous and totally anisotropic Bianchi type-V cosmological model within the framework of self interacting Brans Dicke theory of gravity in the background of anisotropic dark energy (DE) with variable equation of state (EoS) parameter and constant deceleration parameter. Constant deceleration parameter leads to two models of universe, i.e. power law model and exponential model. EoS parameter ω and its existing range for the models is in good agreement with the most recent observational data. We notice that ω given by (37) i.e ω(t) = log(k1t) is more suitable in explaining the evolution of the universe. The physical behaviors of the solutions have also been discussed using some physical quantities. Finally, we observe that despite having several prominent features, both of the DE models discussed fail in details.
description: 17 pages, 11 figures. arXiv admin note: text overlap with arXiv:1206.0391 by other authors
Arctic curves of the six-vertex model on generic domains: the Tangent Method
Creators: name: Colomo, Filippo
name: Sportiello, Andrea
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We revisit the problem of determining the Arctic curve in the six-vertex model with domain wall boundary conditions. We describe an alternative method, by which we recover the previously conjectured analytic expression in the square domain. We adapt the method to work for a large class of domains, and for other models exhibiting limit shape phenomena. We study in detail some examples, and derive, in particular, the Arctic curve of the six-vertex model in a triangoloid domain at the ice-point.
description: 38 pages, 11 figures
Network Clustering via Maximizing Modularity: Approximation Algorithms and Theoretical Limits
Creators: name: Dinh, Thang N.
name: Li, Xiang
name: Thai, My T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Social and Information Networks (cs.SI)
subject: Data Structures and Algorithms (cs.DS)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Many social networks and complex systems are found to be naturally divided into clusters of densely connected nodes, known as community structure (CS). Finding CS is one of fundamental yet challenging topics in network science. One of the most popular classes of methods for this problem is to maximize Newman's modularity. However, there is a little understood on how well we can approximate the maximum modularity as well as the implications of finding community structure with provable guarantees. In this paper, we settle definitely the approximability of modularity clustering, proving that approximating the problem within any (multiplicative) positive factor is intractable, unless P = NP. Yet we propose the first additive approximation algorithm for modularity clustering with a constant factor. Moreover, we provide a rigorous proof that a CS with modularity arbitrary close to maximum modularity QOPT might bear no similarity to the optimal CS of maximum modularity. Thus even when CS with near-optimal modularity are found, other verification methods are needed to confirm the significance of the structure.
description: Appeared in IEEE ICDM 2015
Programmable Multi-Node Quantum Network Design and Simulation
Creators: name: Dasari, Venkat R.
name: Sadlier, Ronald J.
name: Prout, Ryan
name: Williams, Brian P.
name: Humble, Travis S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Software-defined networking offers a device-agnostic programmable framework to encode new network functions. Externally centralized control plane intelligence allows programmers to write network applications and to build functional network designs. OpenFlow is a key protocol widely adopted to build programmable networks because of its programmability, flexibility and ability to interconnect heterogeneous network devices. We simulate the functional topology of a multi-node quantum network that uses programmable network principles to manage quantum metadata for protocols such as teleportation, superdense coding, and quantum key distribution. We first show how the OpenFlow protocol can manage the quantum metadata needed to control the quantum channel. We then use numerical simulation to demonstrate robust programmability of a quantum switch via the OpenFlow network controller while executing an application of superdense coding. We describe the software framework implemented to carry out these simulations and we discuss near-term efforts to realize these applications.
description: 9 pages, scheduled for presentation at SPIE Quantum Information and Computation IX
The Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4)
Creators: name: Lamb, J. B.
name: Oey, M. S.
name: Segura-Cox, D. M.
name: Graus, A. S.
name: Kiminki, D. C.
name: Golden-Marx, J. B.
name: Parker, J. Wm.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the Runaways and Isolated O-Type Star Spectroscopic Survey of the SMC (RIOTS4), a spatially complete survey of uniformly selected field OB stars that covers the entire star-forming body of the SMC. Using the IMACS multislit spectrograph and MIKE echelle spectrograph on the Magellan telescopes, we obtained spectra of 374 early-type field stars that are at least 28 pc from any other OB candidates. We also obtained spectra of an additional 23 field stars in the SMC bar identified from slightly different photometric criteria. Here, we present the observational catalog of stars in the RIOTS4 survey, including spectral classifications and radial velocities. For three multi-slit fields covering 8% of our sample, we carried out monitoring observations over 9-16 epochs to study binarity, finding a spectroscopic, massive binary frequency of at least $\sim$60% in this subsample. Classical Oe/Be stars represent a large fraction of RIOTS4 (42%), occurring at much higher frequency than in the Galaxy, consistent with expectation at low metallicity. RIOTS4 confirmed a steep upper IMF in the field, apparently caused by the inability of the most massive stars to form in the smallest clusters. Our survey also yields evidence for in-situ field OB star formation, and properties of field emission-line star populations, including sgB[e] stars and classical Oe/Be stars. We also discuss the radial velocity distribution and its relation to SMC kinematics and runaway stars. RIOTS4 presents a first quantitative characterization of field OB stars in an external galaxy, including the contributions of sparse, but normal, star formation; runaway stars; and candidate isolated star formation.
description: 21 pages plus supplementary table, 12 Figures, Accepted for publication in ApJ
A bias to CMB lensing measurements from the bispectrum of large-scale structure
Creators: name: Böhm, Vanessa
name: Schmittfull, Marcel
name: Sherwin, Blake D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The rapidly improving precision of measurements of gravitational lensing of the Cosmic Microwave Background (CMB) also requires a corresponding increase in the precision of theoretical modeling. A commonly made approximation is to model the CMB deflection angle or lensing potential as a Gaussian random field. In this paper, however, we analytically quantify the influence of the non-Gaussianity of large-scale structure lenses, arising from nonlinear structure formation, on CMB lensing measurements. In particular, evaluating the impact of the non-zero bispectrum of large-scale structure on the relevant CMB four-point correlation functions, we find that there is a bias to estimates of the CMB lensing power spectrum. For temperature-based lensing reconstruction with CMB Stage-III and Stage-IV experiments, we find that this lensing power spectrum bias is negative and is of order one percent of the signal. This corresponds to a shift of multiple standard deviations for these upcoming experiments. We caution, however, that our numerical calculation only evaluates two of the largest bias terms and thus only provides an approximate estimate of the full bias. We conclude that further investigation into lensing biases from nonlinear structure formation is required and that these biases should be accounted for in future lensing analyses.
description: 15+19 pages, 9 figures. Comments welcome
Electron carriers with possible Dirac-cone-like dispersion in FeSe$_{1-x}$S$_x$ ($x$ = 0 and 0.14) single crystals triggered by structural transition
Creators: name: Sun, Yue
name: Pyon, Sunseng
name: Tamegai, Tsuyoshi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report detailed study of the transport properties of FeSe$_{1-x}$S$_x$ ($x$ = 0 and 0.14) single crystals grown by vapor transport method. 14\% S doping is found significantly suppress the structural transition from $T_s$ $\sim$ 86 K in FeSe to $\sim$ 49 K, although the superconducting transition temperature, $T_c$, is only slightly affected. A pronounced linear magnetoresistance (MR) is observed in both FeSe and FeSe$_{0.86}$S$_{0.14}$ single crystals, which is found to be triggered by the structural transition. The linear MR and related discussion indicate the possible existence of Dirac-cone-like state, which may come from the band shift induced by ferro-orbital order. The mobility of the Dirac-cone-like band is found to decrease after S doping. Besides, the invalid Kohler's scaling of MR is found for temperature below $T_s$ in both crystals, however the re-establishment of the Kohler's scaling at temperatures below 30 K is observed in FeSe, but not in FeSe$_{0.86}$S$_{0.14}$. All these observations above support that the orbital ordering causes the band reconstruction in FeSe, and also that the orbital ordering in FeSe is suppressed by the chemical pressure from S doping.
description: 8 pages, 6 figures
Magnetic Activity of Pre-main Sequence Stars near the Stellar-Substellar Boundary
Creators: name: Principe, David A.
name: Kastner, Joel H.
name: Rodriguez, David
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: X-ray observations of pre-main sequence (pre-MS) stars of M-type probe coronal emission and offer a means to investigate magnetic activity at the stellar-substellar boundary. Recent observations of main sequence (MS) stars at this boundary display a decrease in fractional X-ray luminosity ($L_{X}$/$L_{bol}$) by almost two orders of magnitude for spectral types M7 and later. We investigate magnetic activity and search for a decrease in X-ray emission in the pre-MS progenitors of these MS stars. We present XMM-Newton X-ray observations and preliminary results for ~10 nearby (30-70 pc), very low mass pre-MS stars in the relatively unexplored age range of 10-30 Myr. We compare the fractional X-ray luminosities of these 10-30 Myr old stars to younger (1-3 Myr) pre-MS brown dwarfs and find no dependence on spectral type or age suggesting that X-ray activity declines at an age later than ~30 Myr in these very low-mass stars.
description: 2 pages, 1 figure, to appear in "Young Stars and Planets Near the Sun", Proceedings of IAU Symposium No. 314 (Cambridge University Press), J.H. Kastner, B. Stelzer, S.A. Metchev, eds
Eutrichocampa Silvestri 1902
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Eutrichocampa

description: Genus Eutrichocampa Silvestri, 1902
Eutrichocampa Silvestri, 1902: 240.
Diagnosis, habitat and distribution
In spite of the effort made by Condé (1956a) to maintain the genus Eutrichocampa, the eleven species of Eutrichocampa described show a staggering variability in different characters, which led Paclt (1957) to propose five subgenera and a genus for them. Species of Eutrichocampa (in a wide sense) have been found on four continents: South America, Africa, Asia and Europe. The laminar or subcylindrical telotarsal process with abundant barbs is the only, presumably synapomorphic, feature to gather all these soil dwelling species. The claws are smooth and have no lateral crests. In the present monograph, we follow the criteria of Condé (1956a) for Eutrichocampa, meaning that in Europe and in the Mediterranean regions seven species have been described (Fig. 62).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 92, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
The auto-Igusa zeta function of a plane curve singularity is rational
Creators: name: Stout, Andrew R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H20, 14H50, 14E18

description: It is shown that the auto Igusa zeta function of the germ of a plane curve singularity is rational. This gives a new criterion for a plane curve over an algebraically closed field of characteristic zero to be smooth at a point.
description: 10 pages
Discovery of Two New Pulsars in 47 Tucanae (NGC 104)
Creators: name: Pan, Zhichen
name: Hobbs, George
name: Li, Di
name: Ridolfi, Alessandro
name: Wang, Pei
name: Freire, Paulo
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the discovery of two new millisecond pulsars (PSRs J0024$-$7204aa and J0024$-$7204ab) in the globular cluster 47\,Tucanae (NGC 104). Our results bring the total number of pulsars in 47\,Tucanae to 25. These pulsars were discovered by reprocessing archival observations from the Parkes radio telescope. We reprocessed the data using a standard search procedure based on the PRESTO software package as well as using a new method in which we incoherently added the power spectra corresponding to $\sim$1100\,hr of observations. The newly discovered PSR~J0024$-$7204aa, has a pulse frequency of $\rm \sim$541\,Hz (corresponding to a $\rm \sim$1.84 ms period), which is higher than any other pulsars currently known in the cluster and ranks 12$^{\rm{th}}$ amongst all the currently known pulsars. The dispersion measure of this pulsar, 24.941(7)\,cm$^{-3}$ pc, is the highest in the cluster. The second discovered pulsar, PSR~J0024$-$7204ab, is an isolated pulsar with a pulse frequency of $\rm \sim$270\,Hz (corresponding to a period of $\rm \sim$3.70 ms).
description: 5 pages, 1 table, 5 figures, accepted by MNRAS letter
Estimating sparse precision matrices
Creators: name: Padmanabhan, Nikhil
name: White, Martin
name: Zhou, Harrison H.
name: O'Connell, Ross
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Methodology (stat.ME)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We apply a method recently introduced to the statistical literature to directly estimate the precision matrix from an ensemble of samples drawn from a corresponding Gaussian distribution. Motivated by the observation that cosmological precision matrices are often approximately sparse, the method allows one to exploit this sparsity of the precision matrix to more quickly converge to an asymptotic 1/sqrt(Nsim) rate while simultaneously providing an error model for all of the terms. Such an estimate can be used as the starting point for further regularization efforts which can improve upon the 1/sqrt(Nsim) limit above, and incorporating such additional steps is straightforward within this framework. We demonstrate the technique with toy models and with an example motivated by large-scale structure two-point analysis, showing significant improvements in the rate of convergence.For the large-scale structure example we find errors on the precision matrix which are factors of 5 smaller than for the sample precision matrix for thousands of simulations or, alternatively, convergence to the same error level with more than an order of magnitude fewer simulations.
description: 11 pages, 14 figures, submitted to MNRAS
Nested Markov Properties for Acyclic Directed Mixed Graphs
Creators: name: Richardson, Thomas S.
name: Evans, Robin J.
name: Robins, James M.
name: Shpitser, Ilya
Publisher: name: arXiv
Year: 2017
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62H99

description: Conditional independence models associated with directed acyclic graphs (DAGs) may be characterized in at least three different ways: via a factorization, the global Markov property (given by the d-separation criterion), and the local Markov property. Marginals of DAG models also imply equality constraints that are not conditional independences; the well-known ``Verma constraint'' is an example. Constraints of this type are used for testing edges, and in a computationally efficient marginalization scheme via variable elimination. We show that equality constraints like the ``Verma constraint'' can be viewed as conditional independences in kernel objects obtained from joint distributions via a fixing operation that generalizes conditioning and marginalization. We use these constraints to define, via ordered local and global Markov properties, and a factorization, a graphical model associated with acyclic directed mixed graphs (ADMGs). We prove that marginal distributions of DAG models lie in this model, and that a set of these constraints given by Tian provides an alternative definition of the model. Finally, we show that the fixing operation used to define the model leads to a particularly simple characterization of identifiable causal effects in hidden variable causal DAG models.
description: 36 pages (not including appendix and references), 9 figures. Fixed a definition following equation (16) in the main text (the fix is shown in blue text). Fixed double parentheses showing up for some references
Wide bandwidth nanowire electromechanics on insulating substrates at room temperature
Creators: name: Abhilash, T. S.
name: Mathew, John P
name: Sengupta, Shamashis
name: Gokhale, Mahesh R
name: Bhattacharya, Arnab
name: Deshmukh, Mandar M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study InAs nanowire resonators fabricated on sapphire substrate with a local gate configuration. The key advantage of using an insulating sapphire substrate is that it results in a reduced parasitic capacitance thus allowing both wide bandwidth actuation and detection using a network analyzer as well as signal detection at room temperature. Both in-plane and out-of-plane vibrational modes of the nanowire can be driven and the non-linear response of the resonators studied. In addition this technique enables the study of variation of thermal strains due to heating in nanostructures
An optimal transport formulation of the Einstein equations of general relativity
Creators: name: Mondino, Andrea
name: Suhr, Stefan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The goal of the paper is to give an optimal transport formulation of the full Einstein equations of general relativity, linking the (Ricci) curvature of a space-time with the cosmological constant and the energy-momentum tensor. Such an optimal transport formulation is in terms of convexity/concavity properties of the Shannon-Bolzmann entropy along curves of probability measures extremizing suitable optimal transport costs. The result gives a new connection between general relativity and optimal transport; moreover it gives a mathematical reinforcement of the strong link between general relativity and thermodynamics/information theory that emerged in the physics literature of the last years.
description: 60 pages. Improved overall exposition, added a non-smooth example in the introduction and an appendix about a synthetic non-smooth framework for Einstein's equations. Final version accepted by the Journal of the European Mathematical Society (JEMS)
КОМПОНЕНТЫ И МЕТАБОЛИТЫ, ПРОИСХОДЯЩИЕ ИЗ КИШЕЧНОЙ МИКРОБИОТЫ, В ПРОГРЕССИРОВАНИИ НЕАЛКОГОЛЬНОЙ ЖИРОВОЙ БОЛЕЗНИ ПЕЧЕНИ
Creators: name: Умаров, З. А.
Publisher: name: Zenodo
Year: 2024

description: Человеческая кишечная микробиота все чаще признается важным фактором, влияющим на неалкогольную жировую болезнь печени. Помимо изменений в составе кишечной микробиоты, компоненты и метаболиты, производимые кишечными бактериями, становятся важными регуляторами патологических процессов, связанных с неалкогольной жировой болезнью печени. Надежные данные показывают, что кишечная микробиота вырабатывает различные биоактивные вещества, которые взаимодействуют с клетками печени через воротную вену.
Machine learning as an improved estimator for magnetization curve and spin gap
Creators: name: Nakamura, Tota
Publisher: name: arXiv
Year: 2019
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The magnetization process is a very important probe to study magnetic materials, particularly in search of spin-liquid states in quantum spin systems. Regrettably, however, progress of the theoretical analysis has been unsatisfactory, mostly because it is hard to obtain sufficient numerical data to support the theory. Here we propose a machine-learning algorithm that produces the magnetization curve and the spin gap well out of poor numerical data. The plateau magnetization, its critical field and the critical exponent are estimated accurately. One of the hyperparameters identifies by its score whether the spin gap in the thermodynamic limit is zero or finite. After checking the validity for exactly solvable one-dimensional models we apply our algorithm to the kagome antiferromagnet. The magnetization curve that we obtain from the exact-diagonalization data with 36 spins is consistent with the DMRG results with 132 spins. We estimate the spin gap in the thermodynamic limit at a very small but finite value.
description: 10pages, 4figures. Revised and the algorithm improved
Revisiting the anasynthetic spiral
Creators: name: Haspelmath, Martin
Publisher: name: Zenodo
Year: 2018
Subjects: grammaticalization, language typology, synthetic language

description: Grammaticalization is nowadays often seen primarily as a kind of semantic-pragmatic change, but in the 19th century it was more typically seen in a holistic typological pespective: The idea was that synthetic languages develop from analytic languages, and that they may become analytic again. This kind of development is indeed occasionally observed in entire languages, as in the Romance languages and in Later Egyptian, but it is quite unclear whether such holistic changes are at all common. Similarly, there seems to be no good evidence that changes from agglutinative patterns to isolating patterns go through an intermediate flective or fusional stage. By contrast, there is abundant evidence for the old observation that older tightly bound constructions often get competition from new constructions based on content items, which may eventually replace the older patterns (I call this kind of process anasynthesis). Such anasynthetic changes are driven by inflationary processes that can be observed elsewhere in language and culture, not by therapeutic motivations.
O'QITUVCHI VA TALABALAR O'RTASIDAGI VIZUAL TA'LIM JARAYONINI TASHKIL ETISHDA SEMIOTIK TAHLIL
Creators: name: Abdusamatov, Alisher
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada semiotika sohalari va ularning chegarasi haqida shu bilan birga ularning turlari, semiotik aspektlarning ahamiyati haqida, uning qo’llanish hollari, zarur boʼlgan pedagogik shart - sharoitlar atroflicha bayon etilgan olimlar va ularning qarashlari haqida, semiotikaning tarmoqlar, yoʼnalishlar va uni kundalik hayotimizda qay yoʼsinda foydalanishimiz mumkinligi haqida keltirib oʼtilgan.
Осесимметричные магнитоплазменные возбуждения в двумерных электронных системах
Creators: name: Андреев, И.В.
name: Фортунатов, А.А.
name: Дрёмин, А.А.
Publisher: name: Институт физики твердого тела РАН
Year: 2019

description: Осесимметричные магнитоплазменные возбужденияв двумерных электронных системахИ. В. Андреев, А. А. Фортунатов, А. А. ДрёминИФТТ РАН, 142432, г. Черноголовка Московской обл., ул. Академика Осипьяна, д.2Собственные плазменные колебания в образцах двумерных электронных систем(ДЭС) в форме дисков можно классифицировать при помощи радиального l  0, 1, 2  имагнитного m  0, 1, 2  волновых чисел 1. Моды с m0 являютсяосесимметричными и представляют специальный физический интерес. Вследствиеаксиальной симметрии распределения заряда в данных модах, они обладают нулевымдипольным моментом, и их излучательный распад должен быть дипольно запрещён. Засчёт этого время жизни таких мод больше, чем для фундаментальной моды в диске.В данной работе удалось успешно возбудить и исследовать осесимметричныемагнитоплазменные моды в дисках ДЭС, изготовленных из высокоподвижныхгетероструктур GaAs/AlGaAs с квантовыми ямами. Для возбуждения использовались двеближнепольные методики: в геометрии квазиКорбино при помощи маленькогодискообразного затвора, расположенного в центре образца (см. вставку к рис. 1) 2, и вволноводе при возмущении микроволнового поля внесённым в него диэлектрическимдефектом 3. Детектирование микроволнового поглощения осуществлялось при помощиоптической методики 4.В эксперименте была исследованадисперсия и магнитодисперсияосесимметричных мод, проведенокачественное и количественное сравнениемагнитодисперсий осесимметричной ифундаментальной мод в образцаходинакового диаметра. Проведеносравнение двух методик возбужденияосесимметричных мод. Также былиисследованы проявления релятивистскихэффектов запаздывания дляосесимметричной моды, показано, что онисущественно слабее, чем дляфундаментальной магнитоплазменноймоды.Работа выполнена в рамкахгосударственного задания ИФТТ РАН.Литература1 С.С. Назин и В.Б. Шикин, ФНТ 15, 277 (1989).2 V.M. Muravev, I.V. Andreev, V.N. Belyanin, S.I. Gubarev, and I.V. Kukushkin, Phys. Rev.B 96, 045421 (2017).3 А.А. Загитова, В.М. Муравьев, П.А. Гусихин, А.А. Фортунатов, И.В. Кукушкин,Письма в ЖЭТФ 108, 478 (2018).4 B.M. Ashkinadze, E. Linder, E. Cohen, and Arza Ron, Phys. Status Solidi 164, 231 (1997).
Uncertainty-Aware Imitation Learning using Kernelized Movement Primitives
Creators: name: Silvério, João
name: Huang, Yanlong
name: Abu-Dakka, Fares J.
name: Rozo, Leonel
name: Caldwell, Darwin G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: During the past few years, probabilistic approaches to imitation learning have earned a relevant place in the literature. One of their most prominent features, in addition to extracting a mean trajectory from task demonstrations, is that they provide a variance estimation. The intuitive meaning of this variance, however, changes across different techniques, indicating either variability or uncertainty. In this paper we leverage kernelized movement primitives (KMP) to provide a new perspective on imitation learning by predicting variability, correlations and uncertainty about robot actions. This rich set of information is used in combination with optimal controller fusion to learn actions from data, with two main advantages: i) robots become safe when uncertain about their actions and ii) they are able to leverage partial demonstrations, given as elementary sub-tasks, to optimally perform a higher level, more complex task. We showcase our approach in a painting task, where a human user and a KUKA robot collaborate to paint a wooden board. The task is divided into two sub-tasks and we show that using our approach the robot becomes compliant (hence safe) outside the training regions and executes the two sub-tasks with optimal gains.
description: Published in the proceedings of IROS 2019
Viscoplastic flow in an extrusion damper
Creators: name: Syrakos, Alexandros
name: Dimakopoulos, Yannis
name: Georgiou, Georgios C.
name: Tsamopoulos, John
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Numerical simulations of the flow in an extrusion damper are performed using a finite volume method. The damper is assumed to consist of a shaft, with or without a spherical bulge, oscillating axially in a containing cylinder filled with a viscoplastic material of Bingham type. The response of the damper to a forced sinusoidal displacement is studied. In the bulgeless case the configuration is the annular analogue of the well-known lid-driven cavity problem, but with a sinusoidal rather than constant lid velocity. Navier slip is applied to the shaft surface in order to bound the reaction force to finite values. Starting from a base case, several problem parameters are varied in turn in order to study the effects of viscoplasticity, slip, damper geometry and oscillation frequency to the damper response. The results show that, compared to Newtonian flow, viscoplasticity causes the damper force to be less sensitive to the shaft velocity; this is often a desirable damper property. The bulge increases the required force on the damper mainly by generating a pressure difference across itself; the latter is larger the smaller the gap between the bulge and the casing is. At high yield stresses or slip coefficients the amount of energy dissipation that occurs due to sliding friction at the shaft-fluid interface is seen to increase significantly. At low frequencies the flow is in quasi steady state, dominated by viscoplastic forces, while at higher frequencies the fluid kinetic energy storage and release also come into the energy balance, introducing hysteresis effects.
Towards Orientation Learning and Adaptation in Cartesian Space
Creators: name: Huang, Yanlong
name: Abu-Dakka, Fares J.
name: Silvério, João
name: Caldwell, Darwin G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: As a promising branch of robotics, imitation learning emerges as an important way to transfer human skills to robots, where human demonstrations represented in Cartesian or joint spaces are utilized to estimate task/skill models that can be subsequently generalized to new situations. While learning Cartesian positions suffices for many applications, the end-effector orientation is required in many others. Despite recent advances in learning orientations from demonstrations, several crucial issues have not been adequately addressed yet. For instance, how can demonstrated orientations be adapted to pass through arbitrary desired points that comprise orientations and angular velocities? In this paper, we propose an approach that is capable of learning multiple orientation trajectories and adapting learned orientation skills to new situations (e.g., via-points and end-points), where both orientation and angular velocity are considered. Specifically, we introduce a kernelized treatment to alleviate explicit basis functions when learning orientations, which allows for learning orientation trajectories associated with high-dimensional inputs. In addition, we extend our approach to the learning of quaternions with angular acceleration or jerk constraints, which allows for generating smoother orientation profiles for robots. Several examples including experiments with real 7-DoF robot arms are provided to verify the effectiveness of our method.
description: Accepted for publication at IEEE Transactions on Robotics