cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the solvability of a parameter-dependent cantilever-type BVP
Creators: name: Infante, Gennaro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 34B08, secondary 34B10, 34B18, 47H30

description: We discuss the solvability of a parameter dependent cantilever-type boundary value problem. We provide an existence and localization result for the positive solutions via a Birkhoff-Kellogg type theorem. We also obtain, under additional growth conditions, upper and lower bounds for the involved parameters. An example is presented in order to illustrate the theoretical results.
description: 9 pages, 1 figure
Topological decompositions of the Pauli group and their influence on dynamical systems
Creators: name: Bagarello, Fabio
name: Bavuma, Yanga
name: Russo, Francesco G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the present paper we show that it is possible to obtain the well known Pauli group $P=\langle X,Y,Z \ | \ X^2=Y^2=Z^2=1, (YZ)^4=(ZX)^4=(XY)^4=1 \rangle $ of order $16$ as an appropriate quotient group of two distinct spaces of orbits of the three dimensional sphere $S^3$. The first of these spaces of orbits is realized via an action of the quaternion group $Q_8$ on $S^3$; the second one via an action of the cyclic group of order four $\mathbb{Z}(4)$ on $S^3$. We deduce a result of decomposition of $P$ of topological nature and then we find, in connection with the theory of pseudo-fermions, a possible physical interpretation of this decomposition.
description: in press in "Mathematical Physics, Analysis and Geometry"
Massey products in Galois cohomology and the Elementary Type Conjecture
Creators: name: Quadrelli, Claudio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 12G05, Secondary 20E18, 20J06, 12F10

description: Let $p$ be a prime. We prove that a positive solution to Efrat's Elementary Type Conjecture implies a positive solution to the strengthened version of Minač--Tân's Massey Vanishing Conjecture in the case of finitely generated maximal pro-$p$ Galois groups whose pro-$p$ cyclotomic character has torsion-free image. Consequently, the maximal pro-$p$ Galois group of a field $\mathbb{K}$ containing a root of 1 of order $p$ (and also \sqrt{-1} if $p=2$) satisfies the strong $n$-Massey vanishing property for every $n>2$ (which is equivalent to the cup-defining $n$-Massey product property for every $n>2$, as defined by Minač--Tân) in several relevant cases.
description: Final version, published on the Journal of Number Theory, 258 (2024), 40-65
A Statistical Decision-Theoretical Perspective on the Two-Stage Approach to Parameter Estimation
Creators: name: Lakshminarayanan, Braghadeesh
name: Rojas, Cristian R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: Systems and Control (eess.SY)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: One of the most important problems in system identification and statistics is how to estimate the unknown parameters of a given model. Optimization methods and specialized procedures, such as Empirical Minimization (EM) can be used in case the likelihood function can be computed. For situations where one can only simulate from a parametric model, but the likelihood is difficult or impossible to evaluate, a technique known as the Two-Stage (TS) Approach can be applied to obtain reliable parametric estimates. Unfortunately, there is currently a lack of theoretical justification for TS. In this paper, we propose a statistical decision-theoretical derivation of TS, which leads to Bayesian and Minimax estimators. We also show how to apply the TS approach on models for independent and identically distributed samples, by computing quantiles of the data as a first step, and using a linear function as the second stage. The proposed method is illustrated via numerical simulations.
description: 7 pages, 6 figures, 1 table
A new approach to the genus spectra of abelian $p$-groups
Creators: name: Chen, Haimiao
name: Li, Yang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Group Theory (math.GR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20K01, 57M60, 05E18

description: Given a finite group $G$, the {\it genus spetrum} ${\rm sp}(G)$ of $G$ is the set of integers $g\geq 0$ such that $G$ can act faithfully on an orientable closed surface of genus $g$ by orientation-preserving homeomorphisms. The determination of ${\rm sp}(G)$ is a classical topic and has a long history, but progress is lacked. In this paper, when $G$ is an abelian $p$-group with $p>2$, we propose a new approach to ${\rm sp}(G)$, giving a structural description for ${\rm sp}(G)$ in terms of a function which can be computed in finitely many steps.
description: 14 pages
A long term study of Mars mesospheric clouds seen at twilight based on Mars Express VMC images
Creators: name: Hernandez-Bernal, J.
name: Sanchez-Lavega, A.
name: del Rio-Gaztelurrutia, T.
name: Hueso, R.
name: Ravanis, E.
name: Cardesin-Moinelo, A.
name: Wood, S.
name: Titov, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present the first systematic study of clouds observed during twilight on Mars. We analyze images obtained by the Visual Monitoring Camera (VMC) on Mars Express between 2007 and 2020. Using an automated retrieval algorithm we found 407 cases of clouds observed at twilight, in which the geometry of the observations allows to derive the minimum altitude, revealing that many of these clouds are in the mesosphere (above 40km and up to 90km). The majority of these mesospheric clouds were detected in mid-latitudes at local autumn and winter, a new trend only hinted at by previous studies. In particular, we find a massive concentration of clouds in the southern mid-latitudes between Terra Cimmeria and Aonia, a region where high altitude events have been previously observed. We propose that there is an unknown mechanism in these regions that enhances the probability to host high altitude clouds around the southern winter solstice.
First-order transitions at the Neel temperatures of trigonal SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices
Creators: name: Sangeetha, N. S.
name: Pakhira, Santanu
name: Ding, Q. -P.
name: Lee, H. -C.
name: Smetana, V.
name: Mudring, A. -V.
name: Furukawa, Y.
name: Johnston, D. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Single crystals of SrMn2P2 and CaMn2P2 were grown using Sn flux and characterized by single-crystal x-ray diffraction, electrical resistivity rho, heat capacity Cp, and magnetic susceptibility chi = M/H measurements versus temperature T and magnetization M versus applied magnetic field H isotherm measurements. The x-ray diffraction results show that both compounds adopt the trigonal CaAl2Si2-type structure. The rho(T) measurements demonstrate insulating ground states for both compounds. The chi(T) and Cp(T) data reveal a weak first-order antiferromagnetic (AFM) transition at the Neel temperature TN = 53(1) K for SrMn2P2 and a strong first-order AFM transition at TN = 69.8(3) K for CaMn2P2. Both compounds show an isotropic and nearly T-independent chi(T < TN). {31}P NMR measurements confirm the strong first-order transition in CaMn2P2 but show critical slowing down near TN for SrMn2P2 thus evidencing second-order character. The NMR measurements also indicate that the AFM structure of CaMn2P2 is commensurate with the lattice whereas that of SrMn2P2 is incommensurate. These first-order AFM transitions are unique among the class of trigonal (Ca, Sr, Ba)Mn2(P, As, Sb, Bi)2 compounds which otherwise exhibit second-order AFM transitions. This result presents a challenge to understand the systematics of magnetic ordering in this class of materials in which magnetically-frustrated antiferromagnetism is quasi-two-dimensional.
description: 16 pages, 18 captioned figures, 62 references
The massive expanding molecular torus in the planetary nebula NGC 6302
Creators: name: Peretto, N.
name: Fuller, G. A.
name: Zijlstra, A. A.
name: Patel, N. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We measure the mass and kinematics of the massive molecular torus in the planetary nebula NGC 6302. The nebula is the proto-typical butterfly nebula. The origin of the wing-like morphology is disputed: determining the mass-loss history of the confining torus is an important step in understanding the formation of this structure. We performed submillimeter observations with JCMT and the SMA interferometer. The continuum emission as well as the J=2-1 and 3-2 transitions of 12CO and 13CO are analysed at arcsecond resolution. The CO emission indicates a mass of the torus of ~ 2Msun +/- 1Msun. The 12CO and 13CO emission matches the dark lane seen in absorption in the Halpha image of the object. The CO torus is expanding with a velocity of ~ 8 km/s, centred at Vlsr=-31.5 km/s. The size and expansion velocity of the torus indicates that the torus was ejected from ~ 7500 yr to 2900 yr ago, with a mass-loss rate of 5x10^{-4}Msun/yr. We also see a ballistic component in the CO images with a velocity gradient of 140 km/s/pc. The derived mass-loss history of the torus favours binary interaction as the cause of the ejection of the torus. We predict the existence of a companion with an orbital period P < 1 month.
description: 13 pages, 10 figures, accepted for publication in A&A
Fast method to simulate dynamics of two-phase medium with intense interaction between phases by smoothed particle hydrodynamics: gas-dust mixture with polydisperse particles, linear drag, one-dimensional tests
Creators: name: Stoyanovskaya, Olga
name: Davydov, Maxim
name: Arendarenko, Maxim
name: Isaenko, Elizaveta
name: Markelova, Tamara
name: Snytnikov, Valeriy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: To simulate the dynamics of fluid with polydisperse particles on macroscale level, one has to solve hydrodynamic equations with several relaxation terms, representing momentum transfer from fluid to particles and vice versa. For small particles, velocity relaxation time (stopping time) can be much shorter than dynamical time of fluid \textcolor{red}{that makes} this problem stiff and thus computationally expensive. We present a new fast method for computing several stiff drag terms in two-phase polydisperse medium with Smoothed Particle Hydrodynamics (SPH). In our implementation, fluid and every fraction of dispersed phase are simulated with different sets of particles. The method is based on (1) linear interpolation of velocity values in drag terms, (2) implicit approximation of drag terms that conserves momentum with machine precision\textcolor{red}{,} and (3) solution of system of $N$ linear algebraic equations with $O(N^2)$ arithmetic operation instead of $O(N^3)$. We studied the properties of the proposed method on one-dimensional problems with known solutions. We found that we can obtain acceptable accuracy of the results with numerical resolution independent of short stopping time values. All simulation results discussed in the paper are obtained with \textcolor{red}{open source} software.
description: 25 pages, 10 figure
Belief decision support and reject for textured images characterization
Creators: name: Martin, Arnaud
Publisher: name: arXiv
Year: 2008
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.4; I.5

description: The textured images' classification assumes to consider the images in terms of area with the same texture. In uncertain environment, it could be better to take an imprecise decision or to reject the area corresponding to an unlearning class. Moreover, on the areas that are the classification units, we can have more than one texture. These considerations allows us to develop a belief decision model permitting to reject an area as unlearning and to decide on unions and intersections of learning classes. The proposed approach finds all its justification in an application of seabed characterization from sonar images, which contributes to an illustration.
Current-Induced Torques in Magnetic Metals: Beyond Spin Transfer
Creators: name: Haney, P. M.
name: Duine, R. A.
name: Nunez, A. S.
name: MacDonald, A. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Current-induced torques on ferromagnetic nanoparticles and on domain walls in ferromagnetic nanowires are normally understood in terms of transfer of conserved spin angular momentum between spin-polarized currents and the magnetic condensate. In a series of recent articles we have discussed a microscopic picture of current-induced torques in which they are viewed as following from exchange fields produced by the misaligned spins of current carrying quasiparticles. This picture has the advantage that it can be applied to systems in which spin is not approximately conserved. More importantly, this point of view makes it clear that current-induced torques can also act on the order parameter of an antiferromagnetic metal, even though this quantity is not related to total spin. In this informal and intentionally provocative review we explain this picture and discuss its application to antiferromagnets.
description: 5 figures, to appear in Journal of Magnetism and M
Thermodynamics of a model for RNA folding
Creators: name: dell'Erba, Matias
name: Zemba, Guillermo R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: We analyze the thermodynamic properties of a simplified model for folded RNA molecules recently studied by G. Vernizzi, H. Orland, A. Zee (in {\it Phys. Rev. Lett.} {\bf 94} (2005) 168103). The model consists of a chain of one-flavor base molecules with a flexible backbone and all possible pairing interactions equally allowed. The spatial pseudoknot structure of the model can be efficiently studied by introducing a $N \times N$ hermitian random matrix model at each chain site, and associating Feynman diagrams of these models to spatial configurations of the molecules. We obtain an exact expression for the topological expansion of the partition function of the system. We calculate exact and asymptotic expressions for the free energy, specific heat, entanglement and chemical potential and study their behavior as a function of temperature. Our results are consistent with the interpretation of $1/N$ as being a measure of the concentration of $\rm{Mg}^{++}$ in solution.
description: 11 pages, 4 figures
Universal scaling of current fluctuations in disordered graphene
Creators: name: San-Jose, P.
name: Prada, E.
name: Golubev, D. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We analyze the full transport statistics of graphene with smooth disorder at low dopings. First we consider the case of 1D disorder for which the transmission probability distribution is given analytically in terms of the graphene-specific mean free path. All current cumulants are shown to scale with system parameters (doping, size, disorder strength and correlation length) in an identical fashion for large enough systems. In the case of 2D disorder, numerical evidence is given for the same kind of identical scaling of all current cumulants, so that the ratio of any two such cumulants is universal. Specific universal values are given for the Fano factor, which is smaller than the pseudodiffusive value of ballistic graphene (F=1/3) both for 1D (F=0.243) and 2D (F=0.295) disorder. On the other hand, conductivity in wide samples is shown to grow without saturation as \sqrt{L} and Log L with system length L in the 1D and 2D cases respectively.
description: 9 pages, 7 figures. Published version, includes corrected figure for Fano factor
Soliton structures in a molecular chain model with saturation
Creators: name: Villagran, E.
name: Socorro, J.
name: Garcia-Salcedo, Ricardo
name: Aguero, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In the present work, we study, by means of a one-dimensional lattice model, the collective excitations corresponding to intra molecular ones of a chain like proteins. It is shown that such excitations are described by the Nonlinear Schrodinger equation with saturation. The solutions obtained here are the bell solitons, bubbles, kinks and crowdons. Since they belong to different sectors on the parametric space, the bubble condensation could give place to some important changes of face in this kind of nonlinear system. Additionally, it is shown that the limiting velocity of the solitons is the velocity of sound waves corresponding to longitudinal vibrations of molecules.
description: 12 pages, 4 figures
Spin states and persistent currents in a mesoscopic ring with an embedded magnetic impurity
Creators: name: Sheng, J. S.
name: Chang, Kai
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin states and persistent currents are investigated theoretically in a mesoscopic ring with an embedded magnetic ion under a uniform magnetic field including the spin-orbit interactions. The magnetic impurity acts as a spin-dependent $δ$-potential for electrons and results in gaps in the energy spectrum, consequently suppresses the oscillation of the persistent currents. The competition between the Zeeman splittings and the $s$-$d$ exchange interaction leads to a transition of the electron ground state in the ring. The interplay between the periodic potential induced by the Rashba and Dresselhaus spin-orbit interactions and the $δ$-potential induced by the magnetic impurity leads to significant variation in the energy spectrum, charge density distribution, and persistent currents of electrons in the ring.
description: 8 pages, 11 figures
Studies on polyacetylene production in normal and transformed tissue cultures of Bidens alba
Creators: name: Norton, Robert Allen
Publisher: name: University of British Columbia
Year: 2010

description: The organs of B idens alb a each have a different composition of polyacetylenes (PAs). Factors affecting production of these compounds in tissue and organ cultures, and characteristics of cultures showing sustained synthesis of PAs were - -investigated. Additional studies evaluated transmission of tumour markers and leaf PAs in sexually produced offspring. Polyacetylenes were separated and quantitated by high pressure liquid chromatography. Twenty-one compounds, representing six chromophores, were identified or indicated. The principal compounds were phenylheptatriyne (PHT), found in leaves and stems; phenyldiynene (PDE), found in stems; PDE-OAc, found in roots; and entetraynene acetate (ETE-OAc), found in roots. Production of PAs past the third passage could not be achieved in callus from normal plants, despite variations in medium formulations and environmental parameters. Calluses from crown galls induced on B_. alba and B_. p i lo sa by two strains of Agrobacterium tumefaciens, however, continued to produce PAs after three years in culture. Transformed callus lines showed wide fluctuations in levels and a declining proportion of PDE-OAc over time. Leaf and stem PAs were not found in tumour callus several months old. Callus contained PAs not found in the plant. Root cultures were used to determine the effect of environmental, hormonal, and nutritional parameters on growth, PA level and PA composition. Low temperatures, darkness, high kinetin levels, and increased sucrose/nitrate ratios increased production of PAs by roots. The proportion of PDE-OAc increased in light, high kinetin medium, and late log phase of growth. Leaf and stem PAs could not be induced in root cultures. Plants regenerated from nopaline galls rooted and set fertile seed. Selfs and crosses with normal plants demonstrated inheritance of tumour characteristics to the fourth generation. However, F₂ and succeeding generations had sharply reduced levels of nopaline, and showed differential loss of transformation markers. Transformed F₁ plants could form octopine galls and double transformant tissue was obtained. Transformed plants were morphologically different from normal plants. Crosses between 15. alba and B. pilosa, which did not contain PAs in leaves or stems, yielded F₂ which segregated for PHT synthesis, but not in Mendelian ratios. Synthesis of PHT was dominant but showed depressed levels in the F₂ which was incompatible with a gene dosage effect.
The role of orbital nesting in the superconductivity of Iron-based Superconductors
Creators: name: Fernández-Martin, R.
name: Calderón, M. J.
name: Fanfarillo, L.
name: Valenzuela, B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We analyze the magnetic excitations and the spin-mediated superconductivity in iron-based superconductors within a low-energy model that operates in the band basis but fully incorporates the orbital character of the spin excitations. We show how the orbital selectivity, encoded in our low-energy description, simplifies substantially the analysis and allows for analytical treatments, while retaining all the main features of both spin-excitations and gap functions computed using multiorbital models. Importantly, our analysis unveils the orbital matching between the hole and electron pockets as the key parameter to determine the momentum-dependence and the hierarchy of the superconducting gaps, instead of the Fermi surface matching as in the common nesting scenario.
description: 11 pages, 5 figures. Revised version as published. The revised discussion includes the analysis of the nearly degenerate d-wave pairing symmetry solution beside the dominant s$_\pm$
FIMP Dark Matter from Leptogenesis in Fast Expanding Universe
Creators: name: Chang, Zhi-Fang
name: Chen, Zhao-Xuan
name: Xu, Jia-Shu
name: Han, Zhi-Long
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Within the framework of canonical type-I seesaw, a feebly interacting massive particle (FIMP) $χ$ is introduced as a dark matter candidate. The leptogenesis mechanism and dark matter relic density share a common origin via decays of Majorana neutrinos $N$. Provided an additional species $φ$ whose energy density red-shifts as $ρ_φ\propto a^{-(4+n)}$, the Hubble expansion rate is larger than the standard scenario, i.e., the Universe expands faster. The consequences of such a fast expanding Universe on leptogenesis as well as FIMP dark matter are investigated in detail. We demonstrate a significant impact on the final baryon asymmetry and dark matter abundance due to the existence of $φ$ for the strong washout scenario. While for the weak washout scenario, the effects of FEU are relatively small. We introduce scale factors $F_L$ and $F_χ$ to describe the corresponding effects of FEU. A semi-analytical approach to derive the efficiency factors $η_L$ and $η_χ$ in FEU is also discussed. The viable parameter space for success thermal leptogenesis and correct FIMP DM relic density is obtained for standard cosmology and FEU. Our results show that it is possible to distinguish different cosmology scenarios for strong washout cases.
description: 18 pages, 7 figures
Exact two-terminal reliability of some directed networks
Creators: name: Tanguy, Christian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: The calculation of network reliability in a probabilistic context has long been an issue of practical and academic importance. Conventional approaches (determination of bounds, sums of disjoint products algorithms, Monte Carlo evaluations, studies of the reliability polynomials, etc.) only provide approximations when the network's size increases, even when nodes do not fail and all edges have the same reliability p. We consider here a directed, generic graph of arbitrary size mimicking real-life long-haul communication networks, and give the exact, analytical solution for the two-terminal reliability. This solution involves a product of transfer matrices, in which individual reliabilities of edges and nodes are taken into account. The special case of identical edge and node reliabilities (p and rho, respectively) is addressed. We consider a case study based on a commonly-used configuration, and assess the influence of the edges being directed (or not) on various measures of network performance. While the two-terminal reliability, the failure frequency and the failure rate of the connection are quite similar, the locations of complex zeros of the two-terminal reliability polynomials exhibit strong differences, and various structure transitions at specific values of rho. The present work could be extended to provide a catalog of exactly solvable networks in terms of reliability, which could be useful as building blocks for new and improved bounds, as well as benchmarks, in the general case.
Symmetry-Induced Tunnelling in One-Dimensional Disordered Potentials
Creators: name: Diez, E.
name: Izrailev, F.
name: Krokhin, A. A.
name: Rodriguez, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: A new mechanism of tunnelling at macroscopic distances is proposed for a wave packet localized in one-dimensional disordered potential with mirror symmetry, V(-x)=V(x). Unlike quantum tunnelling through a regular potential barrier, which occurs only at the energies lower then the barrier height, the proposed mechanism of tunnelling exists even for weak white-noise-like scattering potentials. It also exists in classical circuits of resonant contours with random resonant frequencies. The latter property may be used as a new method of secure communication, which does not require coding and decoding of the transmitting signal.
description: 10 pages, 4 figures
Thermal Equilibration of 176-Lu via K-Mixing
Creators: name: Gintautas, Vadas
name: Champagne, Arthur E.
name: Kondev, Filip G.
name: Longland, Richard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In astrophysical environments, the long-lived (\T_1/2 = 37.6 Gy) ground state of 176-Lu can communicate with a short-lived (T_1/2 = 3.664 h) isomeric level through thermal excitations. Thus, the lifetime of 176-Lu in an astrophysical environment can be quite different than in the laboratory. We examine the possibility that the rate of equilibration can be enhanced via K-mixing of two levels near E_x = 725 keV and estimate the relevant gamma-decay rates. We use this result to illustrate the effect of K-mixing on the effective stellar half-life. We also present a network calculation that includes the equilibrating transitions allowed by K-mixing. Even a small amount of K-mixing will ensure that 176-Lu reaches at least a quasi-equilibrium during an s-process triggered by the 22-Ne neutron source.
description: 9 pages, 6 figures
Characterization of the critical values of branching random walks on weighted graphs through infinite-type branching processes
Creators: name: Bertacchi, Daniela
name: Zucca, Fabio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35

description: We study the branching random walk on weighted graphs; site-breeding and edge-breeding branching random walks on graphs are seen as particular cases. We describe the strong critical value in terms of a geometrical parameter of the graph. We characterize the weak critical value and relate it to another geometrical parameter. We prove that, at the strong critical value, the process dies out locally almost surely; while, at the weak critical value, global survival and global extinction are both possible.
description: 14 pages, corrected some typos and minor mistakes
Discrete Accidental Symmetry for a Particle in a Constant Magnetic Field on a Torus
Creators: name: Al-Hashimi, M. H.
name: Wiese, U. -J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A classical particle in a constant magnetic field undergoes cyclotron motion on a circular orbit. At the quantum level, the fact that all classical orbits are closed gives rise to degeneracies in the spectrum. It is well-known that the spectrum of a charged particle in a constant magnetic field consists of infinitely degenerate Landau levels. Just as for the $1/r$ and $r^2$ potentials, one thus expects some hidden accidental symmetry, in this case with infinite-dimensional representations. Indeed, the position of the center of the cyclotron circle plays the role of a Runge-Lenz vector. After identifying the corresponding accidental symmetry algebra, we re-analyze the system in a finite periodic volume. Interestingly, similar to the quantum mechanical breaking of CP invariance due to the $θ$-vacuum angle in non-Abelian gauge theories, quantum effects due to two self-adjoint extension parameters $θ_x$ and $θ_y$ explicitly break the continuous translation invariance of the classical theory. This reduces the symmetry to a discrete magnetic translation group and leads to finite degeneracy. Similar to a particle moving on a cone, a particle in a constant magnetic field shows a very peculiar realization of accidental symmetry in quantum mechanics.
description: 25 pages, 2 figures
Risk factor for developing first episode of peritonitis in patients undergoing CAPD
Creators: name: Chareoen Kaitwatcharachai, Somthawil Kaitwatcharachai
Publisher: name: Faculty of Medicine,Srinakharinwirot University
Year: 2012
Subjects: Risk factor, peritonitis, peritoneal dialysis

description: 3, 19, Journal of Medicine and Health Sciences
Schutzvereine in Ostmitteleuropa
Creators: name: Grabowski, Sabine
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2010

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 59 Nr. 3 (2010): Erinnerungskulturelle Spuren deutsch-polnischer Beziehungsgeschichte
Search for a Solution of the Pioneer Anomaly
Creators: name: Nieto, Michael Martin
name: Anderson, John D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In 1972 and 1973 the Pioneer 10 and 11 missions were launched. They were the first to explore the outer solar system and achieved stunning breakthroughs in deep-space exploration. But beginning in about 1980 an unmodeled force of \sim 8 \times 10^{-8} cm/s^2, directed approximately towards the Sun, appeared in the tracking data. It later was unambiguously verified as being in the data and not an artifact. The cause remains unknown (although radiant heat remains a likely origin). With time more and more effort has gone into understanding this anomaly (and also possibly related effects). We review the situation and describe ongoing programs to resolve the issue.
description: 24 pages 8 figures
Ágnes Tóth, Rückkehr nach Ungarn 1946-1950. Erlebnisberichte ungarndeutscher Vertriebener
Creators: name: Borchers, Roland
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 3 (2014)
Composition and field tuned magnetism and superconductivity in Nd1-xCexCoIn5
Creators: name: Hu, Rongwei
name: Lee, Y.
name: Hudis, J.
name: Mitrovic, V. F.
name: Petrovic, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The Nd1-xCexCoIn5 alloys evolve from local moment magnetism (x = 0) to heavy fermion superconductivity (x =1). Magnetic order is observed over a broad range of x. For a substantial range of x (0.83 <= x <= 0.95) in the temperature - composition phase diagram we find that superconductivity may coexist with spin - density wave magnetic order at the Fermi surface. We show that a delicate balance betwen superconducting and magnetic instabilities can be reversibly tuned by both the Ce/Nd ratio and magnetic field, offering a new and unique model electronic system.
description: 7 pages, 7 figures. Physical Review B in press
Zwischen Politik und Wissenschaft. Der erste Historikerkongress Lettlands, Riga, 16./17. September 2011
Creators: name: Mahling, Madlena
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2012

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 61 Nr. 1 (2012)
D3: A Massive Dataset of Scholarly Metadata for Analyzing the State of Computer Science Research
Creators: name: Wahle, Jan Philip
name: Ruas, Terry
name: Mohammad, Saif M.
name: Gipp, Bela
Publisher: name: arXiv
Year: 2022
Subjects: subject: Digital Libraries (cs.DL)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: DBLP is the largest open-access repository of scientific articles on computer science and provides metadata associated with publications, authors, and venues. We retrieved more than 6 million publications from DBLP and extracted pertinent metadata (e.g., abstracts, author affiliations, citations) from the publication texts to create the DBLP Discovery Dataset (D3). D3 can be used to identify trends in research activity, productivity, focus, bias, accessibility, and impact of computer science research. We present an initial analysis focused on the volume of computer science research (e.g., number of papers, authors, research activity), trends in topics of interest, and citation patterns. Our findings show that computer science is a growing research field (approx. 15% annually), with an active and collaborative researcher community. While papers in recent years present more bibliographical entries in comparison to previous decades, the average number of citations has been declining. Investigating papers' abstracts reveals that recent topic trends are clearly reflected in D3. Finally, we list further applications of D3 and pose supplemental research questions. The D3 dataset, our findings, and source code are publicly available for research purposes.
Additional file 2 of Investigating assessment standards and fixed passing marks in dental undergraduate finals: a mixed-methods approach
Creators: name: Ho, Ting Khee
name: O’Malley, Lucy
name: Roudsari, Reza Vahid
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Cell Biology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: Supplementary Material 2
Low energy π± interactions with S-D shell nuclei
Creators: name: Tacik, Roman
Publisher: name: University of British Columbia
Year: 2010

description: A magnetic spectrometer has been commissioned for use in performing low energy pion scattering experiments. It has been used to measure the differential cross sections for the elastic scattering of 50 MeV π± from 12[sub C], 18[sub O], and 26[sub Mg] targets, as well as the inelastic scattering to the 2₁₊ states of these nuclei. The analysis of the elastic scattering data has been performed with an optical potential model. It is found that the π± elastic cross sections for 12[sub C] and 18[sub O] are well described by calculations employing a global parameter set (CMS 82), which has been previously shown to reproduce π± elastic scattering data for a range of nuclei. The π± elastic data for ²⁶Mg require a variation of the p-wave potential parameters. A similar requirement is seen with π± ³²S elastic data (Sob 84a). Distorted wave calculations, inputting separate neutron and proton transition densities, have been performed for the analysis of the inelastic data. These calculations demonstrate a strong sensitivity of π+ to protons, and π- to neutrons, present in the nucleus. By varying the strengths of the neutron and proton transition densities, in order to reproduce the π± inelastic cross sections, it is possible to determine the ratio of neutron to proton matrix elements (M[sub n]/M[sub p]) for the given 2+ states. It is shown that the value of M[sub n]/M[sub p]) obtained in this way is independent of the optical potential parameters used in the calculation. The extracted values of (M[sub n]/M[sub p]) are: 0.97 ± 0.08, 1.81 ± 0.15, and 0.90 ± 0.07 for 12[sub C], 18[sub O], and 26[sub Mg] respectively. These values are in agreement with those obtained by other means.
Distinct Scaling Regimes of Energy Release Dynamics in the Nighttime Magnetosphere
Creators: name: Uritsky, V. M.
name: Donovan, E.
name: Klimas, A. J.
name: Spanswick, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Based on a spatiotemporal analysis of POLAR UVI images, we show that the auroral emission events that initiate equatorward of the isotropic boundary (IB) obtained from a time-dependent empirical model, have systematically steeper power-law slopes of energy, power, area and lifetime probability distributions compared to the events that initiate poleward of the IB. The low-latitude group of events contains a distinct subpopulation of substorm-scale disturbances violating the power-law behavior, while the high latitude group is described by nearly perfect power-law statistics over the entire range of scales studied. The results obtained indicate that the inner and outer portions of the plasma sheet are characterized by substantially different scaling regimes of bursty energy dissipation suggestive of different physics in these regions.
description: 11 pages, 2 figures, 2 tables
A Spectroscopic Study of the Algol-type Binaries S Equulei and KO Aquilae: Absolute Parameters and Mass Transfer
Creators: name: Soydugan, F.
name: Frasca, A.
name: Soydugan, E.
name: Catalano, S.
name: Demircan, O.
name: Ibanoglu, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present and analyze high-resolution optical spectra of the Algol binaries S Equ and KO Aql. New accurate radial velocities for the hotter primary components are obtained. Thanks to the cross-correlation procedure, we were able to measure, for the first time to our knowledge, radial velocities also for the cool secondary components of S Equ and KO Aql. By combining the parameters obtained from the solution of the radial velocity curves with those obtained from the light curve analysis, reliable absolute parameters of the systems have been derived. The rotational velocity of the hotter components of S Equ and KO Aql has been measured and it is found that the gainers of both systems rotate about 30 % faster than synchronously. This is likely due to mass transfer across the Lagrangian L1 point from the cooler to the hotter component. The lower luminosity of the mass-gaining components of these systems compared to normal main-sequence stars of the same mass can be also an effect of the mass transfer. The H-alpha profiles reveal clear evidence of mass transfer and accretion structures. In both systems we clearly observed extra-absorption lines. From the integrated absorption and the radial velocity variations of these features, we found that the mass accretion is very dense around the impact region of the hotter components. A double-peaked emission in the spectra of S Equ was seen outside the eclipses. One of these peaks is likely originated in a region between the center of mass and the cooler component, which is occupied by the flowing matter. Furthermore, the H-alpha difference spectra of S Equ and KO Aql display also emission features, which should be arising from the magnetic activity of the cooler components.
description: 19 pages
Blow-up solutions of damped Klein-Gordon equation on the Heisenberg group
Creators: name: Ruzhansky, Michael
name: Sabitbek, Bolys
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L71, 35R03, 35B44

description: Inthisnote,weprovetheblow-upofsolutionsofthesemilineardamped Klein-Gordon equation in a finite time for arbitrary positive initial energy on the Heisenberg group. This work complements the paper [21] by the first author and Tokmagambetov, where the global in time well-posedness was proved for the small energy solutions.
title: Vivum Dei Organum (Schneeberg s.a.)
Creators: name: Richter, Georg Gottfried
Publisher: name: DFG-Projekt "Deutsche Orgelpredigtdrucke zwischen 1600 und 1800 – Katalogisierung, Texterfassung, Auswertung"
Year: 2023
Subjects: subject: Georg Gottfried Richter
subject: 1720 [s.a.]
subject: Neustädtel, Zu unserer lieben Frauen
subject: Neustädtel, Johann Peter Pönigk-Orgel 1702
subject: Orgelpredigt
subject: Orgeleinweihung
subject: Einweihungspredigt
subject: digitale Edition
subject: frühe Neuzeit
subject: deutschsprachiger Raum
subject: Musiktheorie

description: Digitale Edition der Orgelpredigt von Georg Gottfried Richter im Rahmen des DFG-Projekts "Deutsche Orgelpredigtdrucke zwischen 1600 und 1800 – Katalogisierung, Texterfassung, Auswertung"
Robert Schweitzer, Finnland, das Zarenreich und die Deutschen
Creators: name: Brüggemann, Karsten
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2010

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 59 Nr. 3 (2010): Erinnerungskulturelle Spuren deutsch-polnischer Beziehungsgeschichte
Elisa-Maria Hiemer, Generationenkonflikt und Gedächtnistradierung. Die Aufarbeitung des Holocaust in der polnischen Erzählprosa des 21. Jahrhunderts
Creators: name: Joachimsthaler, Jürgen
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 3 (2014)
Barbara Engelking, Dariusz Libionka, Żydzi w Powstańczej Warszawie
Creators: name: Löw, Andrea
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2012

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 61 Nr. 2 (2012)
Additional file 1 of Deep learning assisted retinal microvasculature assessment and cerebral small vessel disease in Fabry disease
Creators: name: Li, Yingsi
name: Zhou, Xuecong
name: Li, Junmeng
name: Zhao, Yawen
name: Yuan, Yujing
name: Yang, Bo
name: Xu, Jingjing
name: Wei, Qijie
name: Yan, Xiaoming
name: Zhang, Wei
name: Wu, Yuan
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified

description: Additional file1 (DOCX 27 KB)
Europa in der Frühen Neuzeit
Creators: name: Bahlcke, Joachim
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2010

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 59 Nr. 3 (2010): Erinnerungskulturelle Spuren deutsch-polnischer Beziehungsgeschichte
Rapid-purification protocols for optical homodyning
Creators: name: Chiruvelli, Aravind
name: Jacobs, Kurt
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a number of rapid-purification feedback protocols for optical homodyne detection of a single optical qubit. We derive first a protocol that speeds up the rate of increase of the average purity of the system, and find that like the equivalent protocol for a non-disspative measurement, this generates a deterministic evolution for the purity in the limit of strong feedback. We also consider two analogues of the Wiseman-Ralph rapid-purification protocol in this setting, and show that like that protocol they speed up the average time taken to reach a fixed level of purity. We also examine how the performance of these algorithms changes with detection efficiency, being an important practical consideration.
description: 6 pages, revtex4, 3 eps figures
Steady state kinetic analysis of the transcription of cloned Drosophila melanogaster tRNA[sup Ser] genes
Creators: name: St. Louis, Daniel Claude
Publisher: name: University of British Columbia
Year: 2010

description: Drosophila melanogaster Schneider II cells contain a factor which inhibits in vitro transcription of cloned tRNA genes in crude extracts made from these cells. The inhibitor could, however, be effectively neutralized by addition of certain nontemplate DNAs. In the absence of the transcription inhibitor activity, the steady state kinetics of tRNA production from cloned genes followed one-substrate enzyme kinetics to a high degree of accuracy. Initial and maximal rates of transcription and apparent affinity constants were analyzed for a collection of cloned D. melanogaster tRNA[sup Ser] genes. The stability of the complex formed by the transcription proteins and the template DNA was found to be nearly constant for the genes examined. The transcription rates, however, were greatly influenced by the DNA sequences flanking the tRNA genes. Analysis of transcription competition between DNA templates showed pure competitive behavior. Inhibition constants derived from these experiments indicated that the formation of the transcription complex was affected by sequences flanking the tRNA genes. Furthermore, the rate limiting step in complex formation was independent of the stability of the final form of the complex.
Quarterly Labour Force Survey, October - December, 2011
Creators: name: Statistics, Northern Ireland
name: Office For National Statistics, Social Survey Division
Publisher: name: UK Data Service
Year: 2014

description: The Special Licence version of the QLFS October - December, 2011 is held under SN 6976.

For the second edition (November 2014) an updated version of the data file was deposited, weighted to 2014 population figures (based on Census 2011). The new weighting variables are PIWT14 (income weight) and PWT14 (person weight). Also, non-responders are no longer included in the data due to a change in ONS database systems, so the number of cases is now reduced.
title: Vivum Dei Organum (Schneeberg s.a.): Einführung in die Edition
Creators: name: Braun, Lucinde
Publisher: name: DFG-Projekt "Deutsche Orgelpredigtdrucke zwischen 1600 und 1800 – Katalogisierung, Texterfassung, Auswertung"
Year: 2023
Subjects: subject: Georg Gottfried Richter
subject: 1720 [s.a.]
subject: Neustädtel, Zu unserer lieben Frauen
subject: Neustädtel, Johann Peter Pönigk-Orgel 1702
subject: Orgelpredigt
subject: Orgeleinweihung
subject: digitale Edition
subject: frühe Neuzeit
subject: deutschsprachiger Raum
subject: Musiktheorie
subject: Quellenbeschreibung
subject: Archive
subject: protestantische Kirchenmusik
subject: Musikgeschichte
subject: Kultur- und Sozialgeschichte
subject: Konfessionalisierung

description: Einführungstext zu der digitalen Edition der Orgelpredigt von Georg Gottfried Richter im Rahmen des DFG-Projekts "Deutsche Orgelpredigtdrucke zwischen 1600 und 1800 – Katalogisierung, Texterfassung, Auswertung"