cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum Computing
Creators: name: Rabl, P.
name: Zoller, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study collective excitations of rotational and spin states of an ensemble of polar molecules, which are prepared in a dipolar crystalline phase, as a candidate for a high fidelity quantum memory. While dipolar crystals are formed in the high density limit of cold clouds of polar molecules under 1D and 2D trapping conditions, the crystalline structure protects the molecular qubits from detrimental effects of short range collisions. We calculate the lifetime of the quantum memory by identifying the dominant decoherence mechanisms, and estimate their effects on gate operations, when a molecular ensemble qubit is transferred to a superconducting strip line cavity (circuit QED). In the case rotational excitations coupled by dipole-dipole interactions we identify phonons as the main limitation of the life time of qubits. We study specific setups and conditions, where the coupling to the phonon modes is minimized. Detailed results are presented for a 1D dipolar chain.
Contamination by field late-M, L and T dwarfs in deep surveys
Creators: name: Caballero, J. A.
name: Burgasser, A. J.
name: Klement, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: Deep photometric surveys for substellar objects in young clusters and for high-redshift quasars are affected by contaminant sources at different heliocentric distances.If not correctly taken into account, the contamination may have a strong effect on the Initial Mass Function determination and on the identification of quasars. Aims: We calculate in detail the back- and foreground contamination by field dwarfs of very late spectral types (intermediate and late M, L and T) in deep surveys and provide the data and tools for the computation. Methods: Up-to-date models and data from the literature have been used: (i) a model of the Galactic thin disc by an exponential law; (ii) the length and height scales for late-type dwarfs; (iii) the local spatial densities, absolute magnitudes and colours of dwarfs for each spectral type. Results: We derive a simplified expression for the spatial density in the thin disc that depends on the heliocentric distance and the galactic coordinates (l, b) and integrate it in the truncated cone screened in the survey. As a practical application, we compute the numbers of L- and T-type field dwarfs in very deep (I = 21-29 mag) surveys in the direction of the young sigma Orionis cluster. The increasing number of contaminants at the faintest magnitudes could inhibit the study of the opacity mass limit at M
description: A&A, accepted. 11 pages, 4 figures, 4 tables. Version 2: deleted two spurious figures at the end of the file
What is the Simplest Quantum Field Theory?
Creators: name: Arkani-Hamed, Nima
name: Cachazo, Freddy
name: Kaplan, Jared
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Conventional wisdom says that the simpler the Lagrangian of a theory the simpler its perturbation theory, but an increased understanding of the structure of the S-matrix in gauge theories and gravity has been pointing to the opposite conclusion. In this paper we suggest that N=8 SUGRA has the simplest interacting S-matrix in 4D. Using Grassmann coherent states for external particles shows that amplitudes with maximal SUSY are smooth objects, with the action of SUSY manifest. We show that all tree amplitudes in N=4 SYM and N=8 SUGRA vanish at (supersymmetric) infinite complex momentum, and can thus be determined by recursion relations. We also identify the action of the non-linearly realized E_{7(7)} symmetry of N=8 SUGRA on scattering amplitudes. We give a simple discussion of the structure of 1-loop amplitudes in any QFT, in close parallel to recent work of Forde, showing that the coefficients of scalar "triangle" and "bubble" integrals are determined by the "pole at infinite momentum" of tree amplitude products appearing in cuts. The on-shell superspace for maximal SUSY makes it easy to compute the multiplet sums that arise in these cuts, leading to a simple proof of the absence of triangles and bubbles at 1-loop. We also argue that rational terms are absent. This establishes the recent conjecture that 1-loop amplitudes in N=8 SUGRA have only scalar box integrals, just as N=4 SYM. It is natural to conjecture that with maximal SUSY, amplitudes are completely determined by their leading singularities even beyond tree- and 1-loop level; this would directly imply the perturbative finiteness of N=8 SUGRA. The remarkable properties of scattering amplitudes call for an explanation in terms of a "weak-weak" dual formulation of QFT, a holographic dual of flat space.
description: V1: 71+23 pages, 14 figures, less telegraphic abstract in body of paper V2: 74 + 24 pages. Typos fixed. Added discussion of parity invariance. Corrected the relationship between the N=4 IR equations and recursion relations. Streamlined discussion of the absence of rational terms V3: 75+24 pages. Typos fixed. Corrected beta function computation and N=4 soft scalar discussion
Two Classes of Hot Jupiters
Creators: name: Hansen, Brad M. S.
name: Barman, Travis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We identify two classes of transiting planet, based on their equilibrium temperatures and Safronov numbers. We examine various possible explanations for the dichotomy. It may reflect the influence of planet or planetesimal scattering in determining when planetary migration stops. Another possibility is that some planets lose more mass to evaporation than others. If this evaporation process preferentially removes Helium from the planet, the consequent reduction in the mean molecular weight may explain why some planets have anomalously large radii.
description: 35 pages, 16 figures in Preprint format. Submitted to ApJ
Spin relaxation in diluted magnetic semiconductors. GaMnAs as example
Creators: name: Krainov, I. V.
name: Sapega, V. F.
name: Dimitriev, G. S.
name: Averkiev, N. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on study of magnetic impurities spin relaxation in diluted magnetic semiconductors above Curie temperature. Systems with a high concentration of magnetic impurities where magnetic correlations take place were studied. The developed theory assumes that main channel of spin relaxation is mobile carriers providing indirect interactions between magnetic impurities. Our theoretical model is supported by experimental measurements of manganese spin relaxation time in GaMnAs by means of spin-flip Raman scattering. It is found that with temperature increase spin relaxation rate of ferromagnetic samples increases and tends to that measured in paramagnetic sample.
description: 6 pages, 3 figures
Local patch analysis for testing statistical isotropy of the Planck convergence map
Creators: name: Goyal, Priya
name: Chingangbam, Pravabati
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The small but measurable effect of weak gravitational lensing on the cosmic microwave background radiation provide information about the large-scale distribution of matter in the universe. We use the all sky distribution of matter, as represented by the {\em convergence map} that is inferred from CMB lensing measurement by Planck survey, to test the fundamental assumption of Statistical Isotropy (SI) of the universe. For the analysis we use the $α$ statistic that is devised from the contour Minkowski tensor, a tensorial generalization of the scalar Minkowski functional, the contour length. In essence, the $α$ statistic captures the ellipticity of isofield contours at any chosen threshold value of a smooth random field and provides a measure of anisotropy. The SI of the observed convergence map is tested against the suite of realistic simulations of the convergence map provided by the Planck collaboration. We first carry out a global analysis using the full sky data after applying the galactic and point sources mask. We find that the observed data is consistent with SI. Further we carry out a local search for departure from SI in small patches of the sky using $α$. This analysis reveals several sky patches which exhibit deviations from simulations with statistical significance higher than 95\% confidence level (CL). Our analysis indicates that the source of the anomalous behaviour of most of the outlier patches is inaccurate estimation of noise. We identify two outlier patches which exhibit anomalous behaviour originating from departure from SI at higher than 95\% CL. Most of the anomalous patches are found to be located roughly along the ecliptic plane or in proximity to the ecliptic poles.
description: 23 pages, 6 figures
Phenomenological covariant approach to gravity
Creators: name: Exirifard, Qasem
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We covariantly modify the Einstein-Hilbert action such that the modified action perturbatively resolves the flat rotational velocity curve of the spiral galaxies and gives rise to the Tully-Fisher relation, and dynamically generates the cosmological constant. This modification requires introducing just a single new universal parameter.
description: v6: a mistake in deriving the equation of the cosmological constant corrected, refs added
Josephson dynamics for coupled polariton modes under the atom-field interaction in the cavity
Creators: name: Alodjants, A. P.
name: Arakelian, S. M.
name: Bagayev, S. N.
name: Egorov, V. S.
name: Leksin, A. Yu.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a new approach to the problem of Bose-Einstein condensation (BEC) of polaritons for atom-field interaction under the strong coupling regime in the cavity. We investigate the dynamics of two macroscopically populated polariton modes corresponding to the upper and lower branch energy states coupled via Kerr-like nonlinearity of atomic medium. We found out the dispersion relations for new type of collective excitations in the system under consideration. Various temporal regimes like linear (nonlinear) Josephson transition and/or Rabi oscillations, macroscopic quantum self-trapping (MQST) dynamics for population imbalance of polariton modes are predicted. We also examine the switching properties for time-averaged population imbalance depending on initial conditions, effective nonlinear parameter of atomic medium and kinetic energy of low-branch polaritons.
description: 10 pages, 6 postscript figures, uses svjour.cls
Peucedanum huangshanense Lu Q. Huang, H. S. Peng & S. S. Chu Mount Huangshan 2020, sp. nov.
Creators: name: Chu, Shan-Shan
name: Wang, De-Qun
name: Peng, Hua-Sheng
name: Huang, Lu-Qi
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Apiales
Apiaceae
Peucedanum
Peucedanum huangshanense

description: Peucedanum huangshanense Lu Q.Huang, H.S.Peng & S.S.Chu, sp. nov. (Figs. 1 & 3)
Type: — CHINA. Anhui: Mount Huangshan, on the forest margins and cliffs, elev. ca. 1600 m, 20 August 2018, Peng082011 (holotype ACM!; isotype ACM!).
This new species is similar to Peucedanum praeruptorum, but it can be distinguished from the latter with larger compound umbels (5–14 cm across), rays up to 25, and long-ovoid mericarps with lateral ribs narrowly winged.
Perennial herbs 30–100 cm tall; Rootstock stout, crown usually bearing remnants of leaf sheaths. Stem solitary, branched above, branchlets sparsely puberulous. Leaves basal and cauline, alternate, long-petiolate; basal leaves persistent, petiole 5–15 cm long, ovate-lanceolate petiole sheathing at base; blade broad-ovate or triangular-ovate in outline, ternate or ternate-pinnate, pinnae long-petiolate, 1.7–6.5 cm; terminal leaflet rhombic-obovate, 3–5- lobed, 2–5.5 × 1–3.6 cm, base cuneate, margins 4–6 irregular serrate, apex acuminate, both surfaces glabrous or occasionally puberulous, abaxially nerves prominent; cauline leaves in the lower part similar to basal leaves with shorter petiole; distal turning nearly sessile, leaf sheath slightly wide, margins membranous, leaflet 3-lobed, lobes narrow, base cuneate. Inflorescences compound umbels, 5–14 cm across, much branched; umbellules 10–30-flowered; bracts absent, occasionally 1–2, linear; rays 13–25, unequal, 1.2–6 cm long, inner faces pubescent; bracteoles 8–15, lanceolate, nearly equal to or longer than flowers but shorter than fruits, rough puberulous; pedicels 0.35–0.7 cm. Calyx teeth obsolete; petals white or reddish-lavender, ovate, inflexed; styles short, curved slightly outward. Mericarps brown, long ovoid, ca. 5–6 × 2.5 mm, sparsely pubescent; lateral ribs narrowly winged; vittae 2–4 in each furrow, 6–8 on commissure.
Phenology: —Flowering and fruiting was observed from August to December.
Distribution and Habitat: — Peucedanum huangshanense is endemic to Mount Huangshan, Huangshan City, Anhui Province, China. It grows on the forest margins and cliffs, at elevations between 1100–1800 m.
Etymology: —The specific epithet refers to the locality where this new species was first found.
Paratypes: — CHINA. Anhui: Mount Huangshan, on the cliff, elev. ca. 1684 m, 27 October 2018, Chu & Chen 102701, 102703 (ACM!); same locality, on the mountain roadside, elev. ca. 1630 m, 2 August 2019, Chu & Han QH 080205, QH080217 (ACM!)
description: Published as part of Chu, Shan-Shan, Wang, De-Qun, Peng, Hua-Sheng & Huang, Lu-Qi, 2020, Peucedanum huangshanense (Apiaceae), a new species from Anhui, China, pp. 17-24 in Phytotaxa 430 (1) on pages 21-23, DOI: 10.11646/phytotaxa.430.1.3, http://zenodo.org/record/13876981
Gas spouting of fine particles
Creators: name: Chandnani, Pratap P.
Publisher: name: University of British Columbia
Year: 2010

description: Spouting is a well established gas-solids contacting technique for coarse particles (dp ≥ 1 mm) which are not readily fluidized. Spouting of fine particles (dp < 1 ram), however, is a sparsely touched subject: the few reports in the literature are not in complete harmony with each other, and they lead to a somewhat confused picture about the spoutability of fine particles. Experiments were conducted in a 152-mm diameter transparent conical-cylindrical half-column with particles ranging in size from 90 to 1000 μm and in density from 900 to 8900 kg/m³. The different flow regimes which result on varying bed height and gas velocity for a given particle species were carefully observed, video-taped and mapped. The criteria of both Geldart (1973) and Molerus (1982) for spoutable particles (classified as Group D by Geldart) were shown to be unsatisfactory. Following Ghosh (1965), however, it was found that formation of a stable spout was ensured only if a critical ratio (25.4 in our experiments) of inlet orifice size to particle diameter was not exceeded. Measurements were also made of bed pressure drops, solids circulation patterns and rates, dead zones, longitudinal annular gas velocity profiles, spout contours and fountain heights. It was found that the mechanism by which spouting is terminated in a coarse particle bed, namely, fluidization of the annulus, could not account for its termination in the present beds. The hypothesis that termination was caused instead by choking of the spout was reinforced by the fact that the theory of choking in standpipes could be applied to satisfactorily predict the end of stable spouting.
Exact solutions for time-dependent non-Hermitian oscillators: classical and quantum pictures
Creators: name: Zelaya, Kevin
name: Rosas-Ortiz, Oscar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We associate the stationary harmonic oscillator with time-dependent systems exhibiting non-Hermiticity by means of point transformations. The new systems are exactly solvable, with all-real spectrum, and transit to the Hermitian configuration for the appropriate values of the involved parameters. We provide a concrete generalization of the Swanson oscillator that includes the Caldirola-Kanai model as a particular case. Explicit solutions are given in both, the classical and quantum pictures.
Multi-feature 360 Video Quality Estimation
Creators: name: Azevedo, Roberto G. de A.
name: Birkbeck, Neil
name: Janatra, Ivan
name: Adsumilli, Balu
name: Frossard, Pascal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: We propose a new method for the visual quality assessment of 360-degree (omnidirectional) videos. The proposed method is based on computing multiple spatio-temporal objective quality features on viewports extracted from 360-degree videos. A new model is learnt to properly combine these features into a metric that closely matches subjective quality scores. The main motivations for the proposed approach are that: 1) quality metrics computed on viewports better captures the user experience than metrics computed on the projection domain; 2) the use of viewports easily supports different projection methods being used in current 360-degree video systems; and 3) no individual objective image quality metric always performs the best for all types of visual distortions, while a learned combination of them is able to adapt to different conditions. Experimental results, based on both the largest available 360-degree videos quality dataset and a cross-dataset validation, demonstrate that the proposed metric outperforms state-of-the-art 360-degree and 2D video quality metrics.
The Future is Now: the Formation of Single Low Mass White Dwarfs in the Solar Neighborhood
Creators: name: Kilic, Mukremin
name: Stanek, K. Z.
name: Pinsonneault, M. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Low mass helium-core white dwarfs (M < 0.45 Msun) can be produced from interacting binary systems, and traditionally all of them have been attributed to this channel. However, a low mass white dwarf could also result from a single star that experiences severe mass loss on the first ascent giant branch. A large population of low mass He-core white dwarfs has been discovered in the old metal-rich cluster NGC 6791. There is therefore a mechanism in clusters to produce low mass white dwarfs without requiring binary star interactions, and we search for evidence of a similar population in field white dwarfs. We argue that there is a significant field population (of order half of the detected systems) that arises from old metal rich stars which truncate their evolution prior to the helium flash from severe mass loss. There is a consistent absence of evidence for nearby companions in a large fraction of low mass white dwarfs. The number of old metal-rich field dwarfs is also comparable with the apparently single low mass white dwarf population, and our revised estimate for the space density of low mass white dwarfs produced from binary interactions is also compatible with theoretical expectations. This indicates that this channel of stellar evolution, hitherto thought hypothetical only, has been in operation in our own Galaxy for many billions of years. One strong implication of our model is that single low mass white dwarfs should be good targets for planet searches because they are likely to arise from metal-rich progenitors. We also discuss other observational tests and implications, including the potential impact on SN Ia rates and the frequency of planetary nebulae.
description: ApJ published version
Some properties of angular integrals
Creators: name: Bergère, Michel
name: Eynard, Bertrand
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find new representations for Itzykson-Zuber like angular integrals for arbitrary beta, in particular for the orthogonal group O(n), the unitary group U(n) and the symplectic group Sp(2n). We rewrite the Haar measure integral, as a flat Lebesge measure integral, and we deduce some recursion formula on n. The same methods gives also the Shatashvili's type moments. Finally we prove that, in agreement with Brezin and Hikami's observation, the angular integrals are linear combinations of exponentials whose coefficients are polynomials in the reduced variables (x_i-x_j)(y_i-y_j).
description: 43 pages, Latex
Synchronization transition in the two-dimensional Kuramoto model with dichotomous noise
Creators: name: Sarkar, Mrinal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We numerically study the celebrated Kuramoto model of identical oscillators arranged on the sites of a two-dimensional periodic square lattice and subject to nearest neighbor interactions and dichotomous noise. In the nonequilibrium stationary state attained at long time, the model exhibits a Berezinskii-Kosterlitz-Thouless ($BKT$)-like transition between a phase at low noise amplitude characterized by quasi long-range order (critically ordered phase) and algebraic decay of correlations and a phase at high noise amplitude that is characterized by complete disorder and exponential decay of correlations. The interplay between the noise amplitude and the noise correlation time is investigated, and the complete, nonequilibrium stationary-state phase diagram of the model is obtained. We further study the dynamics of a single topological defect for various amplitude and correlation time of the noise. Our analysis reveals that a finite correlation time promotes vortex excitations, thereby lowering the critical noise amplitude of the transition with an increase in correlation time. In the suitable limit, the resulting phase diagram allows to estimate the critical temperature of the equilibrium $BKT$ transition, which is consistent with that obtained from the study of the dynamics in the Gaussian white noise limit.
description: v2: Published version (14 pages, 15 figures)
Hymerhabdia imperfecta Bertolino, sp. nov.
Creators: name: Bertolino, Marco
name: Costa, Gabriele
name: Bavestrello, Giorgio
name: Pansini, Maurizio
name: Daneri, Giovanni
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Porifera
Demospongiae
Agelasida
Hymerhabdiidae
Hymerhabdia
Hymerhabdia imperfecta

description: Hymerhabdia imperfecta Bertolino, Costa & Pansini sp. nov.
urn:lsid:zoobank.org:act: FF9FC2BD-D935-4B83-B345-228C74D457B2
Fig. 2; Table 3
Etymology
The new species is named after the presence of imperfect rhabdostyles.
Type material
Holotype
CHILE – Puerto Cisnes • Seno Magdalena E; 44.613885° S, 72.94149° W; depth 30 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky cliff by scuba diving; CILE 63; MSGN 60889.
Paratype
CHILE – Puerto Cisnes • 1 specimen; Seno Magdalena F (Punta Angostura); 44.6312,35° S, 72.904239° W; depth 25 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky cliff by scuba diving; CILE 43; DISTAV.
Description
HABITUS. Encrusting, 5 mm thick and 5 cm long (Fig. 2A). Surface rugose and hispid, with visible canals converging towards oscules. Colour in life bright orange (Fig. 2A). Consistency of live specimens friable.
SKELETON. Choanosomal skeleton formed by bundles of long styles and tylostyles with heads embedded in basal layer of rhabdostyles and sinuous sub-tylostyles.
SPICULES. Megascleres: Smooth styles, long and thin, sometimes with modified heads (Fig. 2B), 800– (888.33)–1000 μm long and 5–(7.16)–10 μm thick. Smooth tylostyles 410–(552.5)–700 μm long and 15–(18.9)–25 μm thick (Fig. 2C). Rather short rhabdostyles with heads variable in shape and with pointed or round extremities (Fig. 2D), 140–(252.42)–415 μm long and 7.5–(9.75)–12.5 μm thick. Rhabdostyles often sinuous or modified into oxeas or strongyles (Fig. 2E).
Habitat
Species lives on a rocky cliff at a depth of 25–30 m; Chilean fjords.
Remarks
Out of the nine species of Hymerhabdia previously described around the world (Table 3), none have been recorded along Chilean coasts. The only species of this genus from the Southern Hemisphere is Hymerhabdia oxeata (Dendy, 1924) recorded at a depth of 183 m in northern New Zealand. Hymerabdia imperfecta sp. nov. differs from H. oxeata in having a red colour whereas in H. oxeata the colour is dark brown. As to spicules, H. oxeata has oxeas whereas the new species has tylostyles and rhabdostyles that are not present in H. oxeata. Moreover, the styles of the new species are much larger (Table 3). A comparison with the other 8 species of Hymerhabdia (from the Atlantic Ocean and the Mediterranean Sea reported in Table 3) shows remarkable differences in presence or absence of spicules (oxeas, rhabdostrongyles, toxostrongyles) and in their shape and size.
description: Published as part of Bertolino, Marco, Costa, Gabriele, Bavestrello, Giorgio, Pansini, Maurizio & Daneri, Giovanni, 2020, New sponge species from Seno Magdalena, Puyuhuapi Fjord and Jacaf Canal (Chile), pp. 1-49 in European Journal of Taxonomy 715 on page 7, DOI: 10.5852/ejt.2020.715, http://zenodo.org/record/4022397
The Period Changes of the Cepheid RT Aurigae
Creators: name: Turner, David G.
name: Bryukhanov, Ivan S.
name: Balyuk, Igor I.
name: Gain, Alexey M.
name: Grabovsky, Roman A.
name: Grigorenko, Valery D.
name: Klochko, Igor V.
name: Kosa-Kiss, Attila
name: Kosinsky, Alexey S.
name: Kushmar, Ivan J.
name: Mamedov, Vyacheslav T.
name: Narkevich, Natalya A.
name: Pogosyants, Andrey J.
name: Semenyuta, Andrey S.
name: Sergey, Ivan M.
name: Schukin, Vladimir V.
name: Strigelsky, Jury B.
name: Tamello, Valentina G.
name: Lane, David J.
name: Majaess, Daniel J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of the light curve for the 3.7-day Cepheid RT Aur both before and since 1980 indicate that the variable is undergoing an overall period increase, amounting to +0.082 +-0.012 s/yr, rather than a period decrease, as implied by all observations prior to 1980. Superposed on the star's O-C variations is a sinusoidal trend that cannot be attributed to random fluctuations in pulsation period. Rather, it appears to arise from light travel time effects in a binary system. The derived orbital period for the system is P = 26,429 +-89 days (72.36 +-0.24 years). The inferred orbital parameters from the O-C residuals differ from those indicated by existing radial velocity data. The latter imply the most reasonable results, namely a1 sin i = 9.09 (+-1.81) x 10^8 km and a minimum secondary mass of M2 = 1.15 +-0.25 Msun. Continued monitoring of the brightness and radial velocity changes in the Cepheid are necessary to confirm the long-term trend and to provide data for a proper spectroscopic solution to the orbit.
description: Accepted for publication in PASP (November 2007)
Obtainment of Jones matrix from Mueller-Jones matrix
Creators: name: M. A. Kuntman
Publisher: name: Zenodo
Year: 2019
Subjects: polarization optics, Stokes-Mueller formalism, Jones matrix, Mueller matrix, depolarization, quaternions, Mueller quaternion

description: Mueller matrix of a deterministic optical medium can be represented by a vector state which is an eigenstate of a Hermitian matrix. It is shown that by means of the Hermitian matrix it is possible to find the Jones matrix apart from its overall phase.
Characteristics of Coronavirus and related treatment in the past decade.
Creators: name: Touba Eslaminejad
name: Mirzaie, Vida
name: Saeedeh Shojaeepour
name: Seyedeh Atekeh Torabizadeh
Publisher: name: figshare
Year: 2021
Subjects: Diseases

description: It is about Crona virus as a pandemic disease.
Characteristics of Coronavirus and related treatment in the past decade
Creators: name: Touba Eslaminejad
name: Mirzaie, Vida
name: Saeedeh Shojaeepour
name: Seyedeh Atekeh Torabizadeh
Publisher: name: figshare
Year: 2021
Subjects: Diseases

description: It is about Crona virus as a pandemic disease.
A Survey of Intrinsic Absorption in Active Galaxies using the Far Ultraviolet Spectroscopic Explorer
Creators: name: Dunn, Jay P.
name: Crenshaw, D. Michael
name: Kraemer, S. B.
name: Gabel, J. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a survey of 72 Seyfert galaxies and quasars observed by the it Far Ultraviolet Spectroscopic Explorer (FUSE). We have determined that 72 of 253 available active galactic nuclei (AGN) targets are viable targets for detection of intrinsic absorption lines. We examined these spectra for signs of intrinsic absorption in the O VI doublet (lambda 1031.9, 1037.6) and Lyman beta (lambda 1025.7). The fraction of Seyfert 1 galaxies and low-redshift quasars at z < 0.15 that show evidence of intrinsic UV absorption is ~50%, which is slightly lower than Crenshaw et al. (1999) found (60%) based on a smaller sample of Seyfert 1 galaxies observed with the Hubble Space Telescope (HST). With this new fraction we find a global covering factor of the absorbing gas with respect to the central nucleus of ~0.4. Our survey is to date the largest searching for intrinsic UV absorption with high spectral resolution, and is the first step toward a more comprehensive study of intrinsic absorption in low-redshift AGN.
description: A higher resolution copy of the paper can be found at: http://www.chara.gsu.edu/~dunn/ms.ps
High-dimensional distributed semantic spaces for utterances
Creators: name: Karlgren, Jussi
name: Kanerva, Pentti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: High-dimensional distributed semantic spaces have proven useful and effective for aggregating and processing visual, auditory, and lexical information for many tasks related to human-generated data. Human language makes use of a large and varying number of features, lexical and constructional items as well as contextual and discourse-specific data of various types, which all interact to represent various aspects of communicative information. Some of these features are mostly local and useful for the organisation of e.g. argument structure of a predication; others are persistent over the course of a discourse and necessary for achieving a reasonable level of understanding of the content. This paper describes a model for high-dimensional representation for utterance and text level data including features such as constructions or contextual data, based on a mathematically principled and behaviourally plausible approach to representing linguistic information. The implementation of the representation is a straightforward extension of Random Indexing models previously used for lexical linguistic items. The paper shows how the implemented model is able to represent a broad range of linguistic features in a common integral framework of fixed dimensionality, which is computationally habitable, and which is suitable as a bridge between symbolic representations such as dependency analysis and continuous representations used e.g. in classifiers or further machine-learning approaches. This is achieved with operations on vectors that constitute a powerful computational algebra, accompanied with an associative memory for the vectors. The paper provides a technical overview of the framework and a worked through implemented example of how it can be applied to various types of linguistic features.
Thermomechanical Mean-Field Modeling and Experimental Characterization of Long Fiber-Reinforced Sheet Molding Compound Composites
Creators: name: Kehrer, Maria Loredana
Publisher: name: KIT Scientific Publishing
Year: 2019
Subjects: Langfaserverstärkter Komposit
Mean- und Full-Field Homogenisierung
Thermoelastische Eigenschaften
Dynamisch-mechanische Analyse
Long fiber-reinforced composite
Mean- and full-field homogenization
Thermoelastic properties
Dynamic mechanical analysis

description: A discontinuous fiber-reinforced thermoset material produced by the Sheet Molding Compound process is investigated. Due to the process-related fiber orientation distribution, a composite with an anisotropic microstructure is created which crucially affects the mechanical properties. The central objectives are the modeling of the thermoelastic behavior of the composite accounting for the underlying microstructure, and the experimental characterization of the pure resin and the composite material.
Wave Excitation in Disks Around Rotating Magnetic Stars
Creators: name: Lai, Dong
name: Zhang, Hang
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The accretion disk around a rotating magnetic star (neutron star, white dwarf or T Tauri star) is subjected to periodic vertical magnetic forces from the star, with the forcing frequency equal to the stellar spin frequency or twice the spin frequency. This gives rise bending waves in the disk that may influence the variabilities of the system. We study the excitation, propagation and dissipation of these waves using a hydrodynamical model coupled with a generic model description of the magnetic forces. The $m=1$ bending waves are excited at the Lindblad/vertical resonance, and propagate either to larger radii or inward toward the corotation resonance where dissipation takes place. While the resonant torque is negligible compared to the accretion torque, the wave nevertheless may reach appreciable amplitude and can cause or modulate flux variabilities from the system. We discuss applications of our result to the observed quasi-periodic oscillations from various systems, in particular neutron star low-mass X-ray binaries.
description: Small changes/clarifications. To be published in ApJ, Aug.20,2008 issue
Subcritical String and Large N QCD
Creators: name: Thorn, Charles B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We pursue the possibility of using subcritical string theory in 4 space-time dimensions to establish a string dual for large N QCD. In particular we study the even G-parity sector of the 4 dimensional Neveu-Schwarz dual resonance model as the natural candidate for this string theory. Our point of view is that the open string dynamics given by this model will {\it determine} the appropriate subcritical closed string theory, a tree level background of which should describe the sum of planar multi-loop open string diagrams. We examine the one loop open string diagram, which contains information about the closed string spectrum at weak coupling. Higher loop open string diagrams will be needed to determine closed string interactions. We also analyze the field theory limit of the one loop open string diagram and recover the correct running coupling behavior of the limiting gauge theory.
description: 18 pages, 2 figures, error in eqs 46 and 47 corrected
The perfect lens on a finite bandwidth
Creators: name: Lind-Johansen, Øyvind
name: Seip, Kristian
name: Skaar, Johannes
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The resolution associated with the so-called perfect lens of thickness $d$ is $-2πd/\ln(|χ+2|/2)$. Here the susceptibility $χ$ is a Hermitian function in $H^2$ of the upper half-plane, i.e., a $H^2$ function satisfying $χ(-ω)=\bar{χ(ω)}$. An additional requirement is that the imaginary part of $χ$ be nonnegative for nonnegative arguments. Given an interval $I$ on the positive half-axis, we compute the distance in $L^\infty(I)$ from a negative constant to this class of functions. This result gives a surprisingly simple and explicit formula for the optimal resolution of the perfect lens on a finite bandwidth.
Axinella cylindrica Bertolino & Costa & Bavestrello & Pansini & Daneri 2020, sp. nov.
Creators: name: Bertolino, Marco
name: Costa, Gabriele
name: Bavestrello, Giorgio
name: Pansini, Maurizio
name: Daneri, Giovanni
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Porifera
Demospongiae
Halichondrida
Axinellidae
Axinella
Axinella cylindrica

description: Axinella cylindrica Bertolino, Costa & Pansini sp. nov.
urn:lsid:zoobank.org:act: 21616DF2-8C48-428E-8631-C6A2553E214C
Figs 3–4; Table 4
Etymology
The new species is named after the body shape.
Type material
Holotype
CHILE – Puerto Cisnes • Seno Magdalena B; 44.650167° S, 72.89085° W; depth 20 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky cliff by scuba diving; CILE 1; MSGN 61493.
Paratypes
CHILE – Puerto Cisnes • 1 specimen; Seno Magdalena D; 44.614863° S, 72.958312° W; depth 18 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky bottom by scuba diving; CILE 37; DISTAV • 1 specimen; Seno Magdalena E; 44.613885° S, 72.941490° W; depth 15 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky cliff by scuba diving; CILE 23; DISTAV • 1 specimen; Seno Magdalena D; 56.616666° S, 72.716666° W; depth 20 m; 5–10 Aug. 2016; Marco Bertolino leg.; on a rocky wall by scuba diving; CILE 81; DISTAV.
Description
HABITUS. All of the specimens have a regular cylindrical shape (5–7 cm high, ca 1 cm in diameter) (Fig. 3A). Surface lightly hispid, consistence firm. Colour in life bright yellow (Fig. 3A).
SKELETON. Skeleton formed by network of thin ascending plurispicular fibres forming quadrangular meshes with abundant spongin (Fig. 3B). Choanosome differentiated in axial compressed region (Fig. 3D) and extra-axial plumoreticulate part (Fig. 3 C–D). Ectosome formed by erect spicule brushes, hispidating sponge surface, supported by terminal part of choanosomal ascending fibres (Fig. 3 C–D).
SPICULES. Megascleres: Styles smooth, straight or slightly curved, with regular, round heads (Fig. 4A), 700–(832.5)–960 μm long and 20–(25.2)–32.5 μm thick in holotype. Rhabdostyles smooth with pronounced basal bend (Fig. 4B), 240–(296.5)–435 μm long and 15–(17)–20 μm thick in holotype. Oxeas smooth, more or less folded, 197.5–(346)–425 μm long and 12.5–(18.7)–22.5 μm thick in holotype. The thinnest ones are almost straight or slightly flexuous (Fig. 4C). Measurements of spicule of all collected specimens (holotype and paratypes) are reported in Table 4.
Habitat
This species lives on a rocky cliff covered by coralline algae, at a depth between 15 and 20 m.
Remarks
We have recorded two new species of the genus Axinella and have therefore chosen to make a single discussion after their description.
description: Published as part of Bertolino, Marco, Costa, Gabriele, Bavestrello, Giorgio, Pansini, Maurizio & Daneri, Giovanni, 2020, New sponge species from Seno Magdalena, Puyuhuapi Fjord and Jacaf Canal (Chile), pp. 1-49 in European Journal of Taxonomy 715 on page 11, DOI: 10.5852/ejt.2020.715, http://zenodo.org/record/4022397
ทัศนคติต่อจริยธรรมทางพระพุทธศาสนาของนักศึกษาระดับปริญญาตรี ในเขตกรุงเทพมหานคร
Creators: name: มนูญ คันธประภา
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2012
Subjects: ทัศนคติ,ศีล 5, พรหมวิหาร 4,อิทธิบาท4

description: 2, 6, วารสารวิชาการและวิจัย มทร.พระนคร
X-winds in Action
Creators: name: Cai, Mike J.
name: Shang, Hsien
name: Lin, Hsiao-Hsuan
name: Shu, Frank H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The interaction of accretion disks with the magnetospheres of young stars can produce X-winds and funnel flows. With the assumption of axial symmetry and steady state flow, the problem can be formulated in terms of quantities that are conserved along streamlines, such as the Bernoulli integral (BI), plus a partial differential equation (PDE), called the Grad-Shafranov equation (GSE), that governs the distribution of streamlines in the meridional plane. The GSE plus BI yields a PDE of mixed type, elliptic before critical surfaces where the flow speed equals certain characteristic wave speeds are crossed and hyperbolic afterward. The computational difficulties are exacerbated by the locations of the critical surfaces not being known in advance. To overcome these obstacles, we consider a variational principle by which the GSE can be attacked by extremizing an action integral, with all other conserved quantities of the problem explicitly included as part of the overall formulation. To simplify actual applications we adopt the cold limit of a negligibly small ratio of the sound speed to the speed of Keplerian rotation in the disk where the X-wind is launched. We also ignore the obstructing effects of any magnetic fields that might thread a disk approximated to be infinitesimally thin. We then introduce trial functions with adjustable coefficients to minimize the variations that give the GSE. We tabulate the resulting coefficients so that other workers can have analytic forms to reconstruct X-wind solutions for various astronomical, cosmochemical, and meteoritical applications.
description: 31 pages, 8 figures. Accepted for publication in ApJ
P-band in a rotating optical lattice
Creators: name: Umucalilar, R. O.
name: Oktel, M. O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the effects of rotation on the excited bands of a tight binding lattice, focusing particulary on the first excited (p-) band. Both the on-site energies and the hopping between lattice sites are modified by the effective magnetic field created by rotation, causing a non-trivial splitting and magnetic fine structure of the p-band. We show that Peierls substitution can be modified to describe p-band under rotation, and use this method to derive an effective Hamiltonian. We compare the spectrum of the effective Hamiltonian with a first principles calculation of the magnetic band structure and find excellent agreement, confirming the validity of our approach. We also discuss the on-site interaction terms for bosons and argue that many-particle phenomena in a rotating p-band can be investigated starting from this effective Hamiltonian.
description: 7 pages, 4 figures, new discussion of effective Hamiltonian, references added
A survey of SiO 5-4 emission towards outflows from massive young stellar objects
Creators: name: Gibb, A. G.
name: Davis, C. J.
name: Moore, T. J. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Results are presented of a survey of SiO 5-4 emission observed with the James Clerk Maxwell Telescope (JCMT) towards a sample of outflows from massive young stellar objects. The sample is drawn from a single-distance study by Ridge & Moore. In a sample of 12 sources, the 5-4 line was detected in 5, a detection rate of 42 per cent. This detection rate is higher than that found for a sample of low-luminosity outflow sources, although for sources of comparable luminosity, it is in good agreement with the results of a previous survey of high luminosity sources. For most of the detected sources, the 5-4 emission is compact or slightly extended along the direction of the outflow. NGC6334I shows a clear bipolar flow in the 5-4 line. Additional data were obtained for W3-IRS5, AFGL5142 and W75N for the 2-1 transition of SiO using the Berkeley-Illinois-Maryland Association (BIMA) millimetre interferometer. There is broad agreement between the appearance of the SiO emission in both lines, though there are some minor differences. The 2-1 emission in AFGL5142 is resolved into two outflow lobes which are spatially coincident on the sky, in good agreement with previous observations. In general the SiO emission is clearly associated with the outflow. The primary indicator of SiO 5-4 detectability is the outflow velocity, i.e. the presence of SiO is an indicator of a high velocity outflow. This result is consistent with the existence of a critical shock velocity required to disrupt dust grains and subsequent SiO formation in post-shock gas. There is also weak evidence that higher luminosity sources and denser outflows are more likely to be detected.
description: Accepted for publication in MNRAS
The proton charge radius
Creators: name: Gao, Haiyan
name: Vanderhaeghen, Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Nucleons (protons and neutrons) are the building blocks of atomic nuclei, and are responsible for more than 99\% of the visible matter in the universe. Despite decades of efforts in studying its internal structure, there are still a number of puzzles surrounding the proton such as its spin, and charge radius. Accurate knowledge about the proton charge radius is not only essential for understanding how quantum chromodynamics (QCD) works in the non-perturbative region, but also important for bound state quantum electrodynamics (QED) calculations of atomic energy levels. It also has an impact on the Rydberg constant, one of the most precisely measured fundamental constants in nature. This article reviews the latest situation concerning the proton charge radius in light of the new experimental results from both atomic hydrogen spectroscopy and electron scattering measurements, with particular focus on the latter. We also present the related theoretical developments and backgrounds concerning the determination of the proton charge radius using different experimental techniques. We discuss upcoming experiments, and briefly mention the deuteron charge radius puzzle at the end.
description: 49 pages, 28 figures, review prepared for Rev. Mod. Phys
Convolution series and the generalized convolution Taylor formula
Creators: name: Luchko, Yuri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 26A33, 26B30, 44A10, 45E10

description: In this paper, we deal with the convolution series that are a far reaching generalization of the conventional power series and the power series with the fractional exponents including the Mittag-Leffler type functions. Special attention is given to the most interesting case of the convolution series generated by the Sonine kernels. In this paper, we first formulate and prove the second fundamental theorem for the general fractional integrals and the $n$-fold general sequential fractional derivatives of both the Riemann-Liouville and the Caputo types. These results are then employed for derivation of two different forms of a generalized convolution Taylor formula for representation of a function as a convolution polynomial with a remainder in form of a composition of the $n$-fold general fractional integral and the $n$-fold general sequential fractional derivative of the Riemann-Liouville and the Caputo types, respectively. We also discuss the generalized Taylor series in form of convolution series and deduce the formulas for its coefficients in terms of the $n$-fold general sequential fractional derivatives.
description: 19 pages