cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A unilateral tunnel-diode frequency converter
Creators: name: Little, Warren David
Publisher: name: University of British Columbia
Year: 2011

description: Frequency converters using pumped nonlinear conductance and pumped nonlinear capacitance with the property of signal flow in one direction only are the subject of this thesis. The unilateral property can be obtained either by a suitable termination at the image frequency or by quadrature pumping the conductance and capacitance. Of great importance is a frequency converter in which the output frequency is lower than that of the input. Such a down—converter based upon a proposed image termination method is examined both analytically and experimentally. Conditions are given which the conductance and capacitance must satisfy in order that the image termination be passive. The conditions are fulfilled by a single tunnel—diode. It is found that a forward- to reverse-gain ratio of at least 20 db over a 5% bandwidth is feasible; the estimated noise figure is 3.4 db. The quadrature pumped converter is compared with the image terminated converter and it is shown in particular that the former can be unilateral only at one frequency.
On Character varieties of two-bridge knot groups
Creators: name: Macasieb, Melissa L.
name: Petersen, Kathleen L.
name: van Luijk, Ronald M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 57M25; 57M27; 57M50; 14H10; 11G30

description: We find explicit models for the PSL(2,C)- and SL(2,C)-character varieties of the fundamental groups of complements in S^3 of an infinite family of two-bridge knots that contains the twist knots. We compute the genus of the components of these character varieties, and deduce upper bounds on the degree of the associated trace fields. We also show that these knot complements are fibered if and only if they are commensurable to a fibered knot complement in a Z/2Z-homology sphere, resolving a conjecture of Hoste and Shanahan.
description: 36 pages, 4 figures
Prediction of TiRhAs as a Dirac nodal line semimetal via first-principles calculations
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: cond-mat.mes-hall

description: © 2017 American Physical Society. Using first-principles calculations, we predict that TiRhAs, a previously synthesized compound, is a Dirac nodal line (DNL) semimetal. The DNL in this compound is found to be protected both by the combination of inversion and time-reversal symmetry, and by a reflection symmetry, in the absence of spin-orbit coupling (SOC). Our calculations show that band velocities associated with the nodal line have a high degree of directional anisotropy, with in-plane velocities v perpendicular to the nodal line between 1.2-2.8×105 m/s. The crossings along the DNL are further found to exhibit a prominent and position-dependent tilt along directions perpendicular to the nodal line. We calculate Z2 indices based on parity eigenvalues at time-reversal invariant momenta and show that TiRhAs is topological. A tight-binding model fit from our first-principles calculations demonstrates the existence of two-dimensional drumhead surface states on the surface Brillouin zone. Based on the small gapping of the DNL upon inclusion of SOC and the clean Fermi surface free from trivial bands, TiRhAs is a promising candidate for further studies of the properties of topological semimetals.
Nonlinear phase mixing and phase-space cascade of entropy in gyrokinetic plasma turbulence
Creators: name: Tatsuno, T.
name: Dorland, W.
name: Schekochihin, A. A.
name: Plunk, G. G.
name: Barnes, M.
name: Cowley, S. C.
name: Howes, G. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Electrostatic turbulence in weakly collisional, magnetized plasma can be interpreted as a cascade of entropy in phase space, which is proposed as a universal mechanism for dissipation of energy in magnetized plasma turbulence. When the nonlinear decorrelation time at the scale of the thermal Larmor radius is shorter than the collision time, a broad spectrum of fluctuations at sub-Larmor scales is numerically found in velocity and position space, with theoretically predicted scalings. The results are important because they identify what is probably a universal Kolmogorov-like regime for kinetic turbulence; and because any physical process that produces fluctuations of the gyrophase-independent part of the distribution function may, via the entropy cascade, result in turbulent heating at a rate that increases with the fluctuation amplitude, but is independent of the collision frequency.
description: Revtex, 4 pages, 3 figures; replaced to match published version
Local Fields without Restrictions on the Spectrum of 4-Momentum Operator and Relativistic Lindblad Equation
Creators: name: Kurkov, M. A.
name: Franke, V. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Quantum theory of Lorentz invariant local scalar fields without restrictions on 4-momentum spectrum is considered. The mass spectrum may be both discrete and continues and the square of mass as well as the energy may be positive or negative. Such fields can exist as part of a hidden matter in the Universe if they interact with ordinary fields very weakly. Generalization of Kallen-Lehmann representation for propagators of these fields is found. The considered generalized fields may violate CPT- invariance. Restrictions on mass-spectrum of CPT-violating fields are found. Local fields that annihilate vacuum state and violate CPT- invariance are constructed in this scope. Correct local relativistic generalization of Lindblad equation for density matrix is written for such fields. This generalization is particulary needed to describe the evolution of quantum system and measurement process in a unique way. Difficulties arising when the field annihilating the vacuum interacts with ordinary fields are discussed.
description: Latex 23 pages, sent to "Foundations of Physics"
R-parity violating U(1)'-extended supersymmetric standard model
Creators: name: Lee, Hye-Sung
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Supersymmetry is one of the best motivated new physics scenarios. To build a realistic supersymmetric standard model, however, a companion symmetry is necessary to address various issues. While R-parity is a popular candidate that can address the proton and dark matter issues simultaneously, it is not the only option for such a property. We review how a TeV scale U(1)' gauge symmetry can replace the R-parity. Discrete symmetries of the U(1)' can make the model still viable and attractive with distinguishable phenomenology. For instance, with a residual discrete symmetry of the U(1)', Z6 = B3 x U2, the proton can be protected by the baryon triality (B3) and a hidden sector dark matter candidate can be protected by the U-parity (U2).
description: Invited brief review for Mod. Phys. Lett. A (final version)
Thermal Breakage and Self-Healing of a Polymer Chain under Tensile Stress
Creators: name: Ghosh, A.
name: Dimitrov, D. I.
name: Rostiashvili, V. G.
name: Milchev, A.
name: Vilgis, T. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider the thermal breakage of a tethered polymer chain of discrete segments coupled by Morse potentials under constant tensile stress. The chain dynamics at the onset of fracture is studied analytically by Kramers-Langer multidimensional theory and by extensive Molecular Dynamics simulations in 1D- and 3D-space. Comparison with simulation data in one- and three dimensions demonstrates that the Kramers-Langer theory provides good qualitative description of the process of bond-scission as caused by a {\em collective} unstable mode. We derive distributions of the probability for scission over the successive bonds along the chain which reveal the influence of chain ends on rupture in good agreement with theory. The breakage time distribution of an individual bond is found to follow an exponential law as predicted by theory. Special attention is focused on the recombination (self-healing) of broken bonds. Theoretically derived expressions for the recombination time and distance distributions comply with MD observations and indicate that the energy barrier position crossing is not a good criterion for true rupture. It is shown that the fraction of self-healing bonds increases with rising temperature and friction.
description: 25 pages, 13 pictures
International GUIDE pilot study
Creators: name: Babarovic, Toni
name: Obućina, Ognjen
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Youth
subject: Pilot Projects
subject: Longitudinal Studies
subject: Survey Methodology

description: The GUIDE (Growing Up in Digital Europe) pilot study serves as a critical preparatory phase for the first Europe-wide longitudinal study on the well-being of children and young people. Conducted in Croatia, Finland, France, Ireland and Slovenia (under the umbrella of the COORDINATE project), the pilot study aimed to assess the feasibility, validity and methodological robustness of survey instruments developed for 8-year-old children, their parents and parents of newborns.

Using a combination of cognitive interviews, TRAPD translation methodology, and mixed-methods data collection, the study identified key challenges related to questionnaire complexity, cultural adaptation, and response reliability. The results showed that some survey items were too abstract for young children, while parents struggled with sensitive topics and different response formats. Based on these findings, recommendations were made to simplify the instruments, refine the translations and improve cross-national comparability.

This pilot study provides valuable methodological insights for improving the survey design and implementation of the GUIDE study in its entirety. By addressing the challenges identified, GUIDE aims to produce high quality longitudinal data that will support evidence-based policy making on child and youth well-being in Europe.
Electrical conductivity inhomogeneities in the earth's upper mantle
Creators: name: Hyndman, Roy David
Publisher: name: University of British Columbia
Year: 2011

description: This study was undertaken in order to investigate the possible occurrence of horizontal variations in the electrical conductivity of the Earth’s upper mantle in southwestern Canada, using a series of simultaneous magnetic variograph recordings. Until recently no variation in the conductivity in a horizontal direction had been anticipated nor observed. During the past five years Parkinson in Australia, Rikitake in Japan, Schmucker in Germany and others have observed marked differences in the magnetograms at closely spaced stations. Secondary magnetic fields produced by induction in high conductivity regions in the Earth’s upper mantle have been suggested as the cause of these differences. The profile described in this thesis indicates conductivity inhomogeneities in southwestern British Columbia and southwestern Alberta. The vertical magnetic fields produced by induction in these inhomogeneities for magnetic variations with periods from 10 to 120 minutes have magnitudes of about 30 to 60 percent of the normal horizontal component. The normal vertical component is about 20 percent of the horizontal. These regions appear to be essentially two dimensional with anomalous induction resulting only from that component of the incident magnetic variations which is perpendicular to their strike. This strike and the intensity of the induced field have been estimated at each station. A pronounced difference has also been found between the vertical component of the diurnal geomagnetic variations at a station In the Rocky Mountains and those at the rest of the stations along the profile.
ASPECTS FOR THE DESIGN OF THE TRIGGER AND DATA ACQUISITION AT DAFNE
Creators: name: A. MARINI
name: F. RONGA
Publisher: name: INFN Open Access Repository
Year: 1991

description: DAPHNE with his high luminosity and large crossing frequency constitues a demending environment respect to the trigger and the data acquisition systems of the experiments operating on the machine. In this context, relevant aspects for the online are the expected rates, the timing, the data throughput and the involved CPU power.
Integrated Questionnaire for the Measurement of Social Capital (SC-IQ) - Adapted
Creators: name: Oliveira, H
name: Mendonça, AIS
name: Prazeres, EO
name: Filho, SAS
Publisher: name: Zenodo
Year: 2021
Subjects: Social Capital
Questionnaire
Measurement

description: The document consists of an adaptation of the World Bank's Integrated Questionnaire for the Measurement of Social Capital (SC-IQ), made for a survey conducted in Brazil. The most important questions for the research purpose were selected for the adapted questionnaire.
Algebraic volume density property of affine algebraic manifolds
Creators: name: Kaliman, Shulim
name: Kutzschebauch, Frank
Publisher: name: arXiv
Year: 2009
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32M05, 14R20

description: We introduce the notion of algebraic volume density property for affine algebraic manifolds and prove some important basic facts about it, in particular that it implies the volume density property. The main results of the paper are producing two big classes of examples of Stein manifolds with volume density property. One class consists of certain affine modifications of $\C^n$ equipped with a canonical volume form, the other is the class of all Linear Algebraic Groups equipped with the left invariant volume form.
description: 35 pages
Dimension theory for multimodal maps
Creators: name: Iommi, Godofredo
name: Todd, Mike
Publisher: name: arXiv
Year: 2009
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: This paper is devoted to the study of dimension theory, in particular multifractal analysis, for multimodal maps. We describe the Lyapunov spectrum, generalising previous results by Todd. We also study the multifractal spectrum of pointwise dimension. The lack of regularity of the thermodynamic formalism for this class of maps is reflected in the phase transitions of the spectra.
Gravitational waves from the fragmentation of a supersymmetric condensate
Creators: name: Kusenko, Alexander
name: Mazumdar, Anupam
name: Multamaki, Tuomas
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We discuss the production of gravity waves from the fragmentation of a supersymmetric condensate in the early universe. Supersymmetry predicts the existence of flat directions in the potential. At the end of inflation, the scalar fields develop large time-dependent vacuum expectation values along these flat directions. Under some general conditions, the scalar condensates undergo a fragmentation into non-topological solitons, Q-balls. We study this process numerically and confirm the recent analytical calculations showing that it can produce gravity waves observable by Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), Laser Interferometer Space Antenna (LISA), and Big Bang Observer (BBO). The fragmentation can generate gravity waves with an amplitude as large as Omega_{GW}~10^{-11} and with a peak frequency ranging from mHz to 10 Hz, depending on the parameters. The discovery of such a relic gravitational background radiation can open a new window on the physics at the high scales, even if supersymmetry is broken well above the electroweak scale.
description: 13 pages, 5 figures
Analytical Method for Verification of a Satellite Pass over a Region of the Earth Surface
Creators: name: Atanassov, Atanas Marinov
Publisher: name: arXiv
Year: 2010
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: An analytical method is proposed in this work for verification whether an artificial earth satellite during its orbital motion passes over a region of the earth surface. The method is based on undisturbed Keppler's approximation of the orbit and approximation of the region by a circular segment S. In order to define the situational condition, a conic surface is used with apex in the earth centre, cutting out the circular segment. The tangents of the conical surface with Keppler's plane determine the time intervals in which the satellite trace on the earth surface occurs inside the segment S. The transformation of these tangents in the plane of Keppler's orbit and the determination of their crossing points with Keppler's ellipse lies in the basis of the examined method.
description: 6 pages, 3 figures
Solvation-induced one-dimensional polarons and electron transfer
Creators: name: Ussery, G. L.
name: Gartstein, Yu. N.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: When a one-dimensional (1D) semiconductor nanostructure is immersed in a sluggish polar solvent, fluctuations of the medium may result in the appearance of localized electronic levels inside the band gap. An excess charge carrier can occupy such a level and undergo self-localization into a large-radius adiabatic polaron surrounded by a self-consistent medium polarization pattern. Within an appropriately adapted framework of the Marcus theory, we explore the description and qualitative picture of thermally activated electron transfer involving solvation-induced polaronic-like states by considering transfer between small and 1D species as well as between two 1D species. Illustrative calculations are performed for tubular geometries with possible applications to carbon nanotube systems.
Subverting Telegram's End-to-End Encryption
Creators: name: Cogliati, Benoît-Michel
name: Ethan, Jordan
name: Jha, Ashwin
Publisher: name: CISPA
Year: 2023

description: Telegram is a popular secure messaging service with third biggest user base as of 2021. In this paper, we analyze the security of Telegram’s end-to-end encryption (E2EE) protocol in presence of mass-surveillance. Specifically, we show that Telegram’s E2EE protocol is susceptible to fairly efficient algorithm substitution attacks. While official Telegram clients should be protected against this type of attack due their open-source nature and reproducible builds, this could potentially lead to a very efficient state sponsored surveillance of private communications over Telegram, either on individuals through a targeted attack or massively through some compromised third-party clients. We provide an efficient algorithm substitution attack against MTProto2.0 --- the underlying authenticated encryption scheme --- that recovers significant amount of encryption key material with a very high probability with few queries and fairly low latency. This could potentially lead to a very efficient state sponsored surveillance of private communications over Telegram, either through a targeted attack or a compromised third-party app. Our attack exploits MTProto2.0's degree of freedom in choosing the random padding length and padding value. Accordingly, we strongly recommend that Telegram should revise MTProto2.0's padding methodology. In particular, we show that a minor change in the padding description of MTProto2.0 makes it subversion-resistant in most of the practical scenarios. As a side-effect, we generalize the underlying mode of operation in MTProto2.0, as MTProto-G, and show that this generalization is a multi-user secure deterministic authenticated encryption scheme.
Kondo effect in transport through Aharonov-Bohm and Aharonov-Casher interferometers
Creators: name: Lobos, A. M.
name: Aligia, A. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive the extension of the Hubbard model to include Rashba spin-orbit coupling that correctly describes Aharonov-Bohm and Aharonov-Casher phases in a ring under applied magnetic and electric fields. When the ring is connected to conducting leads, we develop a formalism that is able to describe both, Kondo and interference effects. We find that in the Kondo regime, the spin-orbit coupling reduces strongly the conductance from the unitary limit. This effect in combination with the magnetic flux, can be used to produce spin polarized carriers.
description: 6 pages, 4 figures, presented at SCES2008, Buzios, Brasil
Yet another solution to the Burnside problem for matrix semigroups
Creators: name: Steinberg, Benjamin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We use the kernel category to give a finiteness condition for semigroups. As a consequence we provide yet another proof that finitely generated periodic semigroups of matrices are finite.
Constrained multi-objective particle swarm optimization with application in power generation
Creators: name: Li, Dujuan
Publisher: name: CQUniversity
Year: 2021
Subjects: subject: 80108 Neural, Evolutionary and Fuzzy Computation
subject: FOS: Computer and information sciences
subject: 10206 Operations Research
subject: FOS: Mathematics

description: This thesis is devoted to the study of metaheuristic optimization algorithms and their application in power generation. The study focuses on constrained multi-objective optimization using Particle Swarm Optimization algorithm. A multi-objective constraint-handling method incorporating a dynamic neighbourhood PSO algorithm is proposed for tackling single objective constrained optimization problems. The benchmark simulation results demonstrate the proposed approach is effective and efficient in finding the consistent quality solutions. Compared with the recent research results, the proposed approach is able to provide better or similar good results in most benchmark functions. The proposed performance-based dynamic neighbourhood topology has proved to be able to help make convergence faster than the static neighbourhood topology. The thesis also presents a modified PSO algorithm for solving multi-objective constrained optimization problems. Based on the constraint dominance concept, the proposed approach defines two sets of rules for determining the cognitive and social components of the PSO algorithm. Simulation results for the four numerical optimization problems demonstrate the proposed approach is effective. The proposed approach has a number of advantages such as being applicable to any number of objective functions and computationally inexpensive. As applications, three engineering design optimization problems and the power generation loading optimization problem are investigated. The simulation results for the engineering design optimization problems and the power generation loading optimization problem reveal the capability, effectiveness and efficiency of the proposed approaches. The methodology can be readily applicable to a broad range of applications.
Rotation Measure Synthesis of Galactic Polarized Emission with the DRAO 26-m Telescope
Creators: name: Wolleben, M.
name: Landecker, T. L.
name: Hovey, G. J.
name: Messing, R.
name: Davison, O. S.
name: House, N. L.
name: Somaratne, K. H. M. S.
name: Tashev, I.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Radio polarimetry at decimetre wavelengths is the principal source of information on the Galactic magnetic field. The diffuse polarized emission is strongly influenced by Faraday rotation in the magneto-ionic medium and rotation measure is the prime quantity of interest, implying that all Stokes parameters must be measured over wide frequency bands with many frequency channels. The DRAO 26-m Telescope has been equipped with a wideband feed, a polarization transducer to deliver both hands of circular polarization, and a receiver, all operating from 1277 to 1762 MHz. Half-power beamwidth is between 40 and 30 arcminutes. A digital FPGA spectrometer, based on commercially available components, produces all Stokes parameters in 2048 frequency channels over a 485-MHz bandwidth. Signals are digitized to 8 bits and a Fast Fourier Transform is applied to each data stream. Stokes parameters are then generated in each frequency channel. This instrument is in use at DRAO for a Northern sky polarization survey. Observations consist of scans up and down the Meridian at a drive rate of 0.9 degree per minute to give complete coverage of the sky between declinations -30 degree and 90 degree. This paper presents a complete description of the receiver and data acquisition system. Only a small fraction of the frequency band of operation is allocated for radio astronomy, and about 20 percent of the data are lost to interference. The first 8 percent of data from the survey are used for a proof-of-concept study, which has led to the first application of Rotation Measure Synthesis to the diffuse Galactic emission obtained with a single-antenna telescope. We find rotation measure values for the diffuse emission as high as approximately 100 rad per square metre, much higher than recorded in earlier work.
description: Accepted for publication in The Astronomical Journal
Right-handed Neutrinos in F-theory Compactifications
Creators: name: Tatar, Radu
name: Tsuchiya, Yoichi
name: Watari, Taizan
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: F-theory is one of the frameworks where up-type Yukawa couplings of SU(5) unified theories are naturally generated. As charged matter fields have localized zero modes in F-theory, a study of flavor structure could be easier in F-theory than in Heterotic string theory. In a study of flavor structure in the lepton sector, however, an important role is played by right-handed neutrinos, which are not charged under the SU(5) unified gauge group. It is therefore solicited to find out what right-handed neutrinos are in F-theory compactifications and how their Majorana mass terms are generated together with developing a theoretical framework where effective Yukawa couplings involving both SU(5)-neutral and charged fields can be calculated. We find that the complex structure moduli chiral multiplets of F-theory compactifications are good candidates to be right-handed neutrinos, and that their Majorana masses are automatically generated in flux compactifications. The mass scale is predicted to be somewhat below the GUT scale, which is in nice agreement with the Delta m^2 of the atmospheric neutrino oscillation through the see-saw mechanism. We also discuss various scenarios of solving the dimension-4 proton decay problem in supersymmetric F-theory compactifications, along with considering the consequences of those scenarios in the nature of right-handed neutrinos.
description: 61 pages
RADIATIVE CORRECTIONS AT DAFNE
Creators: name: G. COLANGELO
name: S. DUBNICKA
name: M. GRECO
Publisher: name: INFN Open Access Repository
Year: 1992

description: The status of QED radiative corrections in the vicinity of the Φ is summarized for leptonic and π^+π^-, K^+K^-, K^0,  (K^0) ̅ final states. Simple analytical formulae are given of immediate phenomenological application. A few numerical examples are also given explicitly.
Food Security and Sustainable Seed Supply in Timor-Leste: Formal and Informal Seed Systems (Part 1)
Creators: name: Lopes, Modesto
Publisher: name: Canberra, ACT: Dept. of Pacific Affairs, Research School of Pacific and Asian Studies, The Australian National University
Year: 2018

description: This In Brief is the first in a two-part series on seed systems in Timor-Leste and research carried out for the Seeds of Life program. It describes the context of seed supply in TimorLeste. The second part will detail recent developments and explore the findings of the research. Seeds of Life was a program designed to improve food security through the supply of improved germplasm for staple food crops. It involved the collaboration of the Australian and Timor-Leste governments — through the Australian Centre for International Agriculture Research and the Ministry of Agriculture and Fisheries — and NGOs and international research bodies. Phase 1 of Seeds of Life started in 2000 with work on variety selection. This was extended in Phase 2 in 2005 with work on seed production and distribution. Phase 3 operated in all districts of Timor-Leste including the Special Administrative Region of Oequsse and built on the scientific results and technical capacity of the first two phases. The program was concluded in June 2016 with the establishment of 70 commercial seed producers to produce quality seed for domestic needs. Seeds of Life maintained a core focus on increasing yields by selecting and distributing improved varieties of superior genetic quality (see ACIAR 2016).
K_s→ π^+ π^- γ: a Laboratory for Meson Dynamics
Creators: name: G. D'Ambrosio
name: M. Miragliuolo
name: F. Sannino
Publisher: name: INFN Open Access Repository
Year: 1993

description: We discuss the decay K_s→ π^+ π^-γ in the framework of chiral perturbation theory. The direct emission in this decay can be an useful test of meson dynamics.
Transport phenomena in liquid helium.
Creators: name: Jones, James Donald
Publisher: name: University of British Columbia
Year: 2011

description: This thesis describes an investigation of flow phenomena of liquid helium II associated with temperature and pressure gradients. The experiments were done primarily in the range of heat flow critical with respect to mutual friction and with respect to turbulence in the normal fluid. The results are analysed on a phenomenological basis due to Gorter and Mellink,(12) and are interpreted by making use of the model put forward by Hall and Vinen. (14) This model assumes that the superfluid can develop vortex lines which interact with the thermal excitations of the normal fluid. A conclusion is reached, that a considerable amount of energy is stored in non-thermal motion in this vorticity. Friction in the normal fluid is reviewed in the light of the work of Staas, et al. (8) An experiment to measure the attenuation of secound sound at very low frequencies is described. A few suggestions for further investigation are tendered.
A Cosmic-Ray Veto System for the Gravitational Wave Detector Nautilus
Creators: name: E. Coccia
name: A. Marini
name: G. Mazzitelli
name: G. Modestino
name: F. Ricci
name: F. Ronga
name: L. Votano
Publisher: name: INFN Open Access Repository
Year: 1994

description: The ultracryogenic resonant gravitational wave antenna NAUTILUS now operating at Frascati INFN National Laboratory has been provided with a cosmic-ray veto system consisting of layers of streamer tubes. The experimental setup eand performances of the system are shown. Preliminary results on the data collected during the calibration operations of the antenna are also presented together with the expected number of events from the interactions of hgh-energy hadrons and muons and multihadron showers with the gravitational antenna.
Physics Cahiers - No. 1
Creators: name: S. Bellucci
Publisher: name: INFN Open Access Repository
Year: 1996

description: We begin herewith the editing of physics notes taken in the course of Journal Club seminars at INFN-LNF in 1996. The activity consists of informal talks about work in progress and/or review of (more or less) recent physics results of interest to our laboratory. In the section titles the name of the speakers appear, together with the topics discused in the seminars. We plan to publish these notes twice a year.
From Symmetry to Supersymmetry
Creators: name: Wess, Julius
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This text is the draft of Julius Wess' contribution to the Proceedings of SUSY07 (KIT Karlsruhe) and to "Supersymmetry at the dawn of the LHC" in Eur. Phys. J. C59/2. The manuscript, which Wess could not finish before his death, has been edited for the publication.
description: Feb.2009 - Contribution edited for the Proceedings SUSY07 (KIT Karlsruhe) and "Supersymmetry at the dawn of the LHC" in Eur. Phys. J. C59/2
Multilingual Question Answering over Knowledge Graphs building on a Model of the Lexicon-ontology Interface
Creators: name: Elahi, Mohammad Fazleh
Publisher: name: Universität Bielefeld
Year: 2025
Subjects: subject: 004

description: As the amount of available linked data keeps growing, intuitive and effective
paradigms for accessing and querying this body of knowledge become increasingly
important. Most question answering over linked (QALD) are induced from pairs of
questions and answers using various machine-learning techniques. These systems
often suffer from a lack of controllability, which makes governing and incrementally
improving them challenging, not to mention the initial effort required for collecting
and providing training data. Furthermore, despite the transformation of linked data
into a ’global database’ in which information is accessible across languages, English
continues to dominate QALD research communities, often to the detriment of the
approximately 7, 000 languages spoken worldwide.

Based on preliminary research work, this thesis presents a multilingual question-
answering (QA) approach (QueGG-Multi) that relies on a model of a lexicon-ontology
interface in which the meaning of lexical entries is specified with respect to a given
vocabulary or ontology. More specifically, given a lexicon in a particular language
and for a particular vocabulary, the approach automatically generates a grammar
that allows questions in the specific language to be parsed into SPARQL queries.
The research shows that this approach outperforms current machine-learning-based
QA approaches on QALD benchmarks. Furthermore, it demonstrates the extensibil-
ity of the approach to different languages by adapting it to German, Italian, and
Spanish.

While the approach provides state-of-the-art performance on benchmarks, a crucial
prerequisite for the grammar generation approach is the availability of a Lemon
lexicon that describes which lexical entries can be used to verbalise the elements
of a particular dataset in a specific language. To this end, the work shows that such
a lexicon can be induced automatically to some extent using the LexExMachina
approach that builds on association rules to find correspondences between lexical
elements and ontological vocabulary elements. The results show that the method
could be used to bootstrap the semiautomatic creation of a lexicon, thus having the
potential to significantly reduce the human effort involved in producing lexicons for
languages beyond English.
A biological method for the determination of turfgrass reserves
Creators: name: Marx, Victor Ferenc
Publisher: name: University of British Columbia
Year: 2011

description: A biological method for the measurement of sod reserves was developed. A tool was constructed to obtain sod cores of 4" diameter and 4" deep. The cores were taken from lawns containing local bentgrasses, blue-grasses, fescues and ryegrasses, and from putting greens composed of local bentgrass strains. The cores were kept in a dark chamber. The etiolated grass was clipped periodically until the reserves in the cores became exhausted. The oven dry weight of clippings from a unit core area, the sod reserve index, was used as a measure of reserves. The sod reserve index was found to vary with species and varieties, soil conditions, management practices, amount of solar radiation, wear and compaction, and seasonal changes. Summer dormancy depressed the level of sod reserves. It appeared that photoperiod may play some role in controlling summer dormancy. The turf quality was directly related to the amount of reserves; therefore, the sod reserve index may be used as one of the objective measure of turf quality. The localization of reserves in the soil profile varied slightly with the species used, but the results indicated that only the upper one inch of the soil horizon has a major role as a storage zone for underground reserves.
Recombinant Charmonium in strongly coupled Quark-Gluon Plasma
Creators: name: Young, Clint
name: Shuryak, Edward
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We update our previous work of a Langevin-with-interaction model for charmonium in heavy-ion collisions, by considering the effect due to recombination. We determine the contribution to J/psi yields from charm-anticharm pairs whose constituent quarks originate from two different hard processes. Like the surviving J/psi states, the recombinant J/psi also undergo both a stochastic interaction, determined by a hydrodynamical simulation of the heavy-ion collision, and an interaction determined by the heavy quark-antiquark potentials measured on the lattice for appropriate temperatures. From the results of these simulations, we determine both the direct and the recombinant contribution to the J/psi yields for RHIC conditions, and find that for central collisions, between 30% and 50% of the J/psi yield is due to recombinant production. We compare our results with other models and look for how the recombinant contribution differs from the surviving contribution in the differential p_t yields. Including the recombinant contribution improves the agreement with the latest analysis of charmonium at RHIC, which shows an absence of anomalous suppression except in the most central collisions.
description: 5 pages, 4 figures
Robust Routing Made Easy: Reinforcing Networks Against Non-Benign Faults
Creators: name: Medina, Moti
name: Saberi, Mehrdad
name: Schmid, Stefan
name: Lenzen, Christoph
Publisher: name: CISPA
Year: 2023

description: With the increasing scale of communication networks, the likelihood of failures grows as well. Since these networks form a critical backbone of our digital society, it is important that they rely on robust routing algorithms which ensure connectivity despite such failures. While most modern communication networks feature robust routing mechanisms, these mechanisms are often fairly complex to design and verify, as they need to account for the effects of failures and rerouting on communication.

This paper conceptualizes the design of robust routing mechanisms, with the aim to avoid such complexity. In particular, we showcase simple and generic blackbox transformations that increase resilience of routing against independently distributed failures, which allows to simulate the routing scheme on the original network, even in the presence of non-benign node failures (henceforth called faults). This is attractive as the system specification and routing policy can simply be preserved.

We present a scheme for constructing such a reinforced network, given an existing (synchronous) network and a routing scheme. We prove that this algorithm comes with small constant overheads, and only requires a minimal amount of additional node and edge resources; in fact, if the failure probability is smaller than 1/n, the algorithm can come without any overhead at all. At the same time, it allows to tolerate a large number of independent random (node) faults, asymptotically almost surely. We complement our analytical results with simulations on different real-world topologies.
Galvanomagnetic properties and noise in a barely metallic film of V2O3
Creators: name: Grygiel, Clara
name: Pautrat, Alain
name: Rodiere, Pierre
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have measured the magnetotransport properties of a strained metallic V2O3 thin film. Most of the properties are similar to V2O3 single crystals that have been submitted to a large pressure. In addition, resistance noise analysis indicates that conductivity fluctuations are freezing out at T\approx 10K. Examination of a range of measurements leads to the conclusion that spins-configuration fluctuations dominate in the low temperature regime.
description: accepted for publication in Phys Rev B
Supplemental Fig. S1–S2_JN-00091-2021
Creators: name: Li, Jinfeng
name: Huang, Helen
Publisher: name: figshare
Year: 2021
Subjects: subject: 110603 Motor Control
subject: FOS: Health sciences
subject: 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
subject: FOS: Psychology
subject: 90399 Biomedical Engineering not elsewhere classified
subject: FOS: Medical engineering
subject: 110699 Human Movement and Sports Science not elsewhere classified

description: Supplemental Fig. S1–S2 for submission to Journal of Neurophysiology, the paper title is "Small Directional Treadmill Perturbations Induce Differential Gait Stability Adaptation".
Supersymmetric contributions to direct CP violation in K→ ππγ decays
Creators: name: G. Colangelo
name: G. Isidori
name: J. Portoles
Publisher: name: INFN Open Access Repository
Year: 1999

description: We analyze the supersymmetric contributions to direct-CP-violating observables in K→ ππγ decays induced by gluino--mediated magnetic--penguin operators.  We find that ϵ_(+-γ)^'/ε   and the differential width asymmetry of K^± →π^± π^0 γ decays could be substantially enhanced with respect to their Standard Model  values, especially in the scenario where ϵ^'/ε   is dominated by supersymmetric contributions.  These observables could therefore provide a useful tool to search for New Physics effects in |ΔS|=1 transitions, complementary to ϵ^'/ε and rare decays.
Complex dynamics emerging in Rule 30 with majority memory
Creators: name: Martinez, Genaro J.
name: Adamatzky, Andrew
name: Alonso-Sanz, Ramon
name: Seck-Touh-Mora, J. C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In cellular automata with memory, the unchanged maps of the conventional cellular automata are applied to cells endowed with memory of their past states in some specified interval. We implement Rule 30 automata with a majority memory and show that using the memory function we can transform quasi-chaotic dynamics of classical Rule 30 into domains of travelling structures with predictable behaviour. We analyse morphological complexity of the automata and classify dynamics of gliders (particles, self-localizations) in memory-enriched Rule 30. We provide formal ways of encoding and classifying glider dynamics using de Bruijn diagrams, soliton reactions and quasi-chemical representations.
Probing the gluon self-interaction in light mesons
Creators: name: Fischer, Christian S.
name: Williams, Richard
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate masses and decay constants of light mesons from a coupled system of Dyson--Schwinger and Bethe--Salpeter equations. We explicitly take into account dominant non-Abelian contributions to the dressed quark-gluon vertex stemming from the gluon self-interaction. We construct the corresponding Bethe-Salpeter kernel that satisfies the axial-vector Ward-Takahashi identity. Our numerical treatment fully includes all momentum dependencies with all equations solved completely in the complex plane. This approach goes well beyond the rainbow-ladder approximation and permits us to investigate the influence of the gluon self-interaction on the properties of mesons. As a first result we find indications of a nonperturbative cancellation of the gluon self-interaction contributions and pion cloud effects in the mass of the rho-meson.
description: 4 pages, 5 figures. Matches published version in PRL
Robust Routing Made Easy: Reinforcing Networks Against Non-Benign Faults
Creators: name: Lenzen, Christoph
name: Medina, Moti
name: Saberi, Mehrdad
name: Schmid, Stefan
Publisher: name: CISPA
Year: 2023

description: With the increasing scale of communication networks, the likelihood of failures grows as well. Since these networks form a critical backbone of our digital society, it is important that they rely on robust routing algorithms which ensure connectivity despite such failures. While most modern communication networks feature robust routing mechanisms, these mechanisms are often fairly complex to design and verify, as they need to account for the effects of failures and rerouting on communication.

This paper conceptualizes the design of robust routing mechanisms, with the aim to avoid such complexity. In particular, we showcase simple and generic blackbox transformations that increase resilience of routing against independently distributed failures, which allows to simulate the routing scheme on the original network, even in the presence of non-benign node failures (henceforth called faults). This is attractive as the system specification and routing policy can simply be preserved.

We present a scheme for constructing such a reinforced network, given an existing (synchronous) network and a routing scheme. We prove that this algorithm comes with small constant overheads, and only requires a minimal amount of additional node and edge resources; in fact, if the failure probability is smaller than 1/n, the algorithm can come without any overhead at all. At the same time, it allows to tolerate a large number of independent random (node) faults, asymptotically almost surely. We complement our analytical results with simulations on different real-world topologies.
Hadronic Cross-Sections in γγ Processes and the Next Linear Collider
Creators: name: Godbole, Rohini M.
name: G. Pancheri
Publisher: name: INFN Open Access Repository
Year: 2000

description: In this note we address the issue of theoretical estimates of the hadronic cross-sections for γγ processes. We compare the predictions of the minijet model with data and with other models, highlighting the band of uncertainties in σ(γγ→hadrons) extracted from the data.We find that the rise of σ_γγ^tot with energy  shown in the latest γγ   data is in tune with the faster rise expected in the Eikonal Minijet Models (EMM).We present an estimate of the accuracy with which this cross-section needs to be measured to distinguish between the different theoretical models which try to 'explain' the rise of total cross-sections with energy. We find that the precision of measurement required to distinguish the EMM type models from the proton-like models ≲20%, whereas to distinguish between various proton-like models or between different parametrizations of the EMM, a precision ≲8-9% or ≲ 6-9% respectively, for 300