cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Flemingia angusta Craib 1913
Creators: name: Do, Truong Van
name: Gao, Xin-Fen
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Flemingia
Flemingia angusta

description: 11. Flemingia angusta Craib (1913: 41). Type:— MYANMAR. Tharrawaddy, Kangyi Reserve, Lace 5858 (Holotype, K; isotype, E-00157791!)
Perennial shrubs, erect. Branchlets terete, ca. 3 mm diam., with obviously lenticellate, glabrous. Petiole 5.3–6.5 cm long, winged, pubescent; petiolules 3–4 mm long, pubescent. Stipules lanceolate, caducous. Leaves digitately 3-foliolate; leaflets angusta-lanceolate, 15–22 cm long, 1.5–3.2 cm wide, apex acute to acuminate, base cuneate, unequal, leathery, adaxially sparsely sessile brownish glands, glabrous, abaxially densely sessile brownish glands, glabrous, except for veins, basal veins 3, unequal, external ones reaching upwards to more than one-three of the length of the lamina, lateral veins pinnate, 10–11 pairs, venation distinct and prominent. Inflorescence racemose, axillary, solitary or cluster of two–three racemes; inflorescence axis conspicuous, 2–5 cm long, straight; bracts lanceolate-ovate, imbricate, 5–6 mm long, 1.5–2 mm wide, margin densely hairy, caducous. Flowers 6–8 mm long; pedicels subsessile or nearly so, ca. 1 mm long. Calyx tube ca. 2 mm long, calyx lobes unequal, upper subequally 4-lobed, straight, linear-lanceolate, 3 mm long, 1 mm wide, lower 1-lobed, broadest and longest, 4.5 mm long, 1.5 mm wide. Corolla purplish, subequal to calyx; standard orbicular, 5–6 mm long, 2–3 mm wide; wings obovate, 4–5 mm long, 1.5–2 mm wide; keel falcate, 5–6 mm long, 2.5–3 mm wide. Stamens diadelphous; staminal tube 5–6 mm long; vexillary stamen free, 3–4 mm long, thin, glabrous. Pods ellipsoid, 9–10 mm long, 4–5 mm diam.
Ecology and phenology: — Flemingia angusta grows in Pine forests, elev. 1300–1600 m. Flowering and fruiting are observed from January to February
Distribution: —Endemic to Myanmar.
Notes: — Flemingia angusta is a very distinct species, nearest to F. stricta with similar inflorescence, but it totally differs from the latter by the morphological characters of petioles (distinctly winged vs. not winged), stipules (caducous vs. persistent), leaf blade (angusta-lanceolate vs. elliptic to lanceolate-ovate), venations (basal veins 3, unequal, external ones reaching upwards to more than one-three of the length of the lamina vs. pinnate), and bracts (lanceolate-ovate, subequal to corolla vs. linear-lanceolate, much longer than corolla).
Representative specimens: — MYANMAR. Henzada, Yenan Quang, February 1903, Shaik Mokaim 1343 (K-001097315); Pegu River, 6 February 1854, McClelland s.n. (K-001097316).
description: Published as part of Do, Truong Van & Gao, Xin-Fen, 2020, Taxonomic revision of the genus Flemingia (Leguminosae) from Indo-Chinese floristic region, pp. 1-38 in Phytotaxa 429 (1) on pages 24-25, DOI: 10.11646/phytotaxa.429.1.1, http://zenodo.org/record/13876867
Monte Carlo study of the evaporation/condensation transition on different Ising lattices
Creators: name: Nußbaumer, Andreas
name: Bittner, Elmar
name: Janke, Wolfhard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In 2002 Biskup et al. [Europhys. Lett. 60, 21 (2002)] sketched a rigorous proof for the behavior of the 2D Ising lattice gas, at a finite volume and a fixed excess δM of particles (spins) above the ambient gas density (spontaneous magnetisation). By identifying a dimensionless parameter Δ(δM) and a universal constant Δ_c, they showed in the limit of large system sizes that for Δ< Δ_c the excess is absorbed in the background (``evaporated'' system), while for Δ> Δ_c a droplet of the dense phase occurs (``condensed'' system). To check the applicability of the analytical results to much smaller, practically accessible system sizes, we performed several Monte Carlo simulations for the 2D Ising model with nearest-neighbour couplings on a square lattice at fixed magnetisation M. Thereby, we measured the largest minority droplet, corresponding to the condensed phase, at various system sizes (L=40, >..., 640). With analytic values for for the spontaneous magnetisation m_0, the susceptibility χand the Wulff interfacial free energy density τ_W for the infinite system, we were able to determine λnumerically in very good agreement with the theoretical prediction. Furthermore, we did simulations for the spin-1/2 Ising model on a triangular lattice and with next-nearest-neighbour couplings on a square lattice. Again, finding a very good agreement with the analytic formula, we demonstrate the universal aspects of the theory with respect to the underlying lattice. For the case of the next-nearest-neighbour model, where τ_W is unknown analytically, we present different methods to obtain it numerically by fitting to the distribution of the magnetisation density P(m).
description: 14 pages, 17 figures, 1 table
Superintegrability of matrix Student's distribution
Creators: name: Mironov, A.
name: Morozov, A.
name: Popolitov, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: For ordinary matrix models, the eigenvalue probability density decays rapidly as one goes to infinity, in other words, has "short tails". This ensures that all the multiple trace correlators (multipoint moments) are convergent and well-defined. Still, many critical phenomena are associated with an enhanced probability of seemingly rare effects, and one expects that they are better described by the "long tail" models. In absence of the exponential fall-off, the integrals for high moments diverge, and this could imply a loss of (super)integrability properties pertinent to matrix and eigenvalue models and, presumably, to the non-perturbative (exact) treatment of more general quantum systems. In this paper, we explain that this danger to modern understanding could be exaggerated. We consider a simple family of long-tail matrix models, which preserve the crucial feature of superintegrability: exact factorized expressions for a full set of basic averages. It turns out that superintegrability can survive after an appropriate (natural and obvious) analytical continuation even in the presence of divergencies, which opens new perspectives for the study of the long-tail matrix models.
description: 7 pages
Augmenting Sequential Recommendation with Pseudo-Prior Items via Reversely Pre-training Transformer
Creators: name: Liu, Zhiwei
name: Fan, Ziwei
name: Wang, Yu
name: Yu, Philip S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Sequential Recommendation characterizes the evolving patterns by modeling item sequences chronologically. The essential target of it is to capture the item transition correlations. The recent developments of transformer inspire the community to design effective sequence encoders, \textit{e.g.,} SASRec and BERT4Rec. However, we observe that these transformer-based models suffer from the cold-start issue, \textit{i.e.,} performing poorly for short sequences. Therefore, we propose to augment short sequences while still preserving original sequential correlations. We introduce a new framework for \textbf{A}ugmenting \textbf{S}equential \textbf{Re}commendation with \textbf{P}seudo-prior items~(ASReP). We firstly pre-train a transformer with sequences in a reverse direction to predict prior items. Then, we use this transformer to generate fabricated historical items at the beginning of short sequences. Finally, we fine-tune the transformer using these augmented sequences from the time order to predict the next item. Experiments on two real-world datasets verify the effectiveness of ASReP. The code is available on \url{https://github.com/DyGRec/ASReP}.
description: Accepted by SIGIR 2021
A novel machine learning technique to identify and categorize plasma waves in spacecraft measurements
Creators: name: Vech, Daniel
name: Malaspina, David M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The available magnetic field data from the terrestrial magnetosphere, solar wind and planetary magnetospheres exceeds over $10^6$ hours. Identifying plasma waves in these large data sets is a time consuming and tedious process. In this Paper, we propose a solution to this problem. We demonstrate how Self-Organizing Maps can be used for rapid data reduction and identification of plasma waves in large data sets. We use 72,000 fluxgate and 110,000 search coil magnetic field power spectra from the Magnetospheric Multiscale Mission (MMS$_1$) and show how the Self-Organizing Map sorts the power spectra into groups based on their shape. Organizing the data in this way makes it very straightforward to identify power spectra with similar properties and therefore this technique greatly reduces the need for manual inspection of the data. We suggest that Self-Organizing Maps offer a time effective and robust technique, which can significantly accelerate the processing of magnetic field data and discovery of new wave forms.
description: Accepted in "JGR: Space Physics - Technical Reports: Methods"
Using integral transforms to estimate higher order derivatives
Creators: name: Bradley, David M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Numerical Analysis (math.NA)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 44A20; 65D30; 65R10

description: Integral transformations are used to estimate high order derivatives of various special functions. Applications are given to numerical integration, where estimates of high order derivatives of the integrand are needed to achieve bounds on the error. The main idea is to find a suitable integral representation of the function whose derivatives are to be estimated, differentiate repeatedly under the integral sign, and estimate the resulting integral.
description: 10 pages AMSLaTeX, 1 table, 1 figure
Evaluation of the Efficacy of Platelet Targeting as a Novel Therapeutic Approach for Multiple Sclerosis
Creators: name: Lim, Jing Ting Vernise
Publisher: name: La Trobe
Year: 2024
Subjects: classificationCode: 320403
subject: Autoimmunity
classificationCode: 320404
subject: Cellular immunology
classificationCode: 320905
subject: Neurology and neuromuscular diseases

description: Submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to La Trobe Rural Health School, La Trobe University, Victoria, Australia.
Sample-efficient Gear-ratio Optimization for Biomechanical Energy Harvester
Creators: name: Kobayashi, Taisuke
name: Ikawa, Yutaro
name: Matsubara, Takamitsu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The biomechanical energy harvester is expected to harvest the electric energies from human motions. A tradeoff between harvesting energy and keeping the user's natural movements should be balanced via optimization techniques. In previous studies, the hardware itself has been specialized in advance for a single task like walking with constant speed on a flat. A key ingredient is Continuous Variable Transmission (CVT) to extend it applicable for multiple tasks. CVT could continuously adjust its gear ratio to balance the tradeoff for each task; however, such gear-ratio optimization problem remains open yet since its optimal solution may depend on the user, motion, and environment. Therefore, this paper focuses on a framework for data-driven optimization of a gear ratio in a CVT-equipped biomechanical energy harvester. Since the data collection requires a heavy burden on the user, we have to optimize the gear ratio for each task in the shortest possible time. To this end, our framework is designed sample-efficiently based on the fact that the user encounters multiple tasks, which are with similarities with each other. Specifically, our framework employs multi-task Bayesian optimization to reuse the optimization results of the similar tasks previously optimized by finding their similarities. Through experiments, we confirmed that, for each task, the proposed framework could achieve the optimal gear ratio of around 50~\% faster than one by random search, and that takes only around 20~minutes. Experimental results also suggested that the optimization can be accelerated by actively exploiting similarities with previously optimized tasks.
description: 13 pages, 11 figures
A Comparative Study of Optical and Ultraviolet Effective Temperatures for DA White Dwarfs from the IUE Archive
Creators: name: Lajoie, C. -P.
name: Bergeron, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a comparative study of effective temperatures determined from the hydrogen Balmer lines and from the UV energy distribution for 140 DA white dwarfs drawn from the IUE archive. Our results indicate that the optical and UV temperatures of the majority of stars below T~40,000 K and within ~75 pc are in fairly good agreement given the uncertainties. At higher temperatures and/or larger distances, however, significant discrepancies are observed. Several mechanisms are investigated to account for these discrepancies including the effect of interstellar reddening, the presence of metals in the photosphere, and the existence of unresolved binary white dwarfs. The results of our analysis reveal that wavelength-dependent extinction is the most natural explanation for the observed temperature differences. We also attempt to predict the differences in optical and UV temperatures expected from unresolved degenerate binaries by performing an exhaustive simulation of composite model spectra. In light of these simulations, we then discuss some known double degenerates and identify new binary candidates by restricting our analysis to stars located within 75 pc where the effect of interstellar reddening is significantly reduced.
description: Manuscript, 36 pages, 11 figures, accepted for publication in ApJ
Deep MMT Transit Survey of the Open Cluster M37 I: Observations and Cluster Parameters
Creators: name: Hartman, J. D.
name: Gaudi, B. S.
name: Holman, M. J.
name: McLeod, B. A.
name: Stanek, K. Z.
name: Barranco, J. A.
name: Pinsonneault, M. H.
name: Meibom, S.
name: Kalirai, J. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have conducted a deep ($15 \la r \la 23$), 20 night survey for transiting planets in the intermediate age open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5m Multiple Mirror Telescope (MMT). In this paper we describe the observations and data reduction procedures for the survey and analyze the stellar content and dynamical state of the cluster. By combining high resolution spectroscopy with existing $BVI_{C}K_{S}$ and new $gri$ color magnitude diagrams we determine the fundamental cluster parameters: $t = 485 \pm 28$ Myr without overshooting ($t = 550 \pm 30 {\rm Myr}$ with overshooting), $E(B-V) = 0.227 \pm 0.038$, $(m-M)_{V} = 11.57 \pm 0.13$ and $[M/H] = +0.045 \pm 0.044$ which are in good agreement with, though more precise than, previous measurements. We determine the mass function down to $0.3 M_{\odot}$ and use this to estimate the total cluster mass of $3640 \pm 170 M_{\odot}$.
description: 65 pages, 21 figures, 11 tables. Accepted for publication in ApJ
Recent BES Results on Hadron Spectroscopy
Creators: name: Yuan, Chang-Zheng
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present recent results from the BES experiment on the observation of the Y(2175) in J/ψ\to ϕf_0(980) η, study of η(2225) in J/ψ\to γϕϕ, and the production of X(1440) recoiling against an ωor a ϕin J/ψhadronic decays. The observation of ψ(2S) radiative decays is also presented.
description: 5 pages
Observation of harmonic lasing in the Angstrom regime at European XFEL
Creators: name: Schneidmiller, E. A.
name: Brinker, F.
name: Decking, W.
name: Froehlich, L.
name: Guetg, M.
name: Noelle, D.
name: Scholz, M.
name: Yurkov, M. V.
name: Zagorodnov, I.
name: Geloni, G.
name: Gerasimova, N.
name: Gruenert, J.
name: Laksman, J.
name: Liu, J.
name: Karabekyan, S.
name: Kujala, N.
name: Maltezopoulos, Th.
name: Petrov, I.
name: Samoylova, L.
name: Serkez, S.
name: Sinn, H.
name: Wolff-Fabris, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Harmonic lasing provides an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can generate a much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve the longitudinal coherence and spectral power of a Self-Amplified Spontaneous Emission (SASE) FEL. This concept was tested at FLASH in the range of 4.5 - 15 nm and at PAL XFEL at 1 nm. In this paper we present recent results from the European XFEL where we successfully demonstrated harmonic lasing at 5.9 Angstrom and 2.8 Angstrom. In the latter case we obtained both 3rd and 5th harmonic lasing and, for the first time, operated a harmonic lasing cascade (5th-3rd-1st harmonics of the undulator). These results pave the way for reaching very high photon energies, up to 100 keV.
description: arXiv admin note: text overlap with arXiv:1612.03635
On Jordan type inequalities for hyperbolic functions
Creators: name: Klen, R.
name: Visuri, M.
name: Vuorinen, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: This paper deals with some inequalities for trigonometric and hyperbolic functions such as the Jordan inequality and its generalizations. In particular, lower and upper bounds for functions such as (sin x)/x and x/(sinh x) are proved.
description: 16 pages
Vertical gardening and Syrian women refugees in Lebanon: an exploratory study on motivation for gardening and depression relief
Creators: name: Talhouk, S. N.
name: Chalak, A.
name: Kamareddine, Z.
name: Fabian, M.
name: Itani, M.
name: Ferguson, N.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Refugees and the displaced experience challenges which can lead to mental health illnesses, including depression. In this study, the effectiveness of gardening in reducing depression and improving the lives of displaced Syrian women in Lebanon was explored. Considering that the displaced had limited outdoor space and no access to land, vertical gardening units were used. Forty-four participants residing in four displaced communities in North Lebanon joined the 6-months gardening programme, which was designed as a quasi-experimental exploratory study. Data on depression scores were collected at the preparatory phase and at 24 weeks post-intervention using the Beck Depression Inventory (BDI-II) and analysed using a paired t-test. Results revealed that participants were less depressed at the end of the gardening programme, with depression scores significantly lower than preparatory phase scores. Group interviews were also conducted to assess women’s perception of gardening halfway through the intervention phase. Women’s engagement in gardening activities was also reflected by estimating yields. Participants indicated that they joined the programme because they saw it as a stress relief activity, they were interested to learn about vertical gardening, they enjoyed the aesthetic value of plants, they wanted to produce food and they felt that gardening provided an opportunity to socialise. Our findings suggest that aid organisations may consider vertical gardening as a therapeutic and social activity in situations where displaced women are confined to limited open spaces.
A phenomenological approach to understanding the meaning of adjustment to chronic pain
Creators: name: Labrick, Elisabeth
Publisher: name: University of British Columbia
Year: 2010

description: This study investigated the meaning of adjustment to chronic pain. Three co-researchers were interviewed in intensive sessions. They were asked to describe the story of their adjustment to chronic pain. The interviews were tape-recorded, transcribed as "protocols", and formed the data base for the study. The meaning of adjustment to chronic pain was discovered through a phenomenological methodology. The protocol analysis yielded the themes, the comprehensive phenomenological description of adjustment to chronic pain, and the essential structure. Implications for further thinking and for practice were presented.
The Solar Radius in the EUV during the Cycle XXIII
Creators: name: de Castro, C. G. Giménez
name: Saraiva, A. C. V.
name: Costa, J. E. R.
name: Selhorst, C. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims. To determine the solar transition region and coronal radius at EUV wavelengths and its time evolution during Solar Cycle XXIII. Methods. We use daily 30.4 and 17.1 nm images obtained by the Extreme Ultraviolet Imager (EIT) aboard the SoHO satellite and derive the solar radius by fitting a circle to the limb brightness ring. Results. The weighted mean of the temporal series gives (967''.56 +/- 0''.04) and (969''.54 +/- 0''.02) at 30.4 and 17.1 nm respectively. No significant correlation was found with the solar cycle at any of the two wavelengths. Conclusions. Since the temperature formation of the 30.4 nm line is between (60 - 80) 10^3 K (Transition Region), the obtained result is bigger than that derived from present atmospheric models. On the contrary this height is compatible with radio models.
description: accepted for publication in Astronomy & Astrophysics minor changes introduced during review process
Effect of optically thin cooling curves on condensation formation: Case study using thermal instability
Creators: name: Hermans, Joris
name: Keppens, Rony
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Non-gravitationally induced condensations are observed in many astrophysical environments. Such structures are formed due to energy loss by optically thin radiative emission. Instead of solving the full radiative transfer equations, precomputed cooling curves are typically used in numerical simulations. In the literature, there exists a wide variety of cooling curves and they are quite often used as unquestionable ingredients. We determine the effect of the optically thin cooling curves on the formation and evolution of condensations. We perform a case study using thermal instability as a mechanism to form in situ condensations. We compare 2D numerical simulations with different cooling curves using interacting slow magnetohydrodynamic (MHD) waves as trigger for the thermal instability. Furthermore, we discuss a bootstrap measure to investigate the far non-linear regime of thermal instability. In the appendix, we include the details of all cooling curves implemented in MPI-AMRVAC and briefly discuss a hydrodynamic variant of the slow MHD waves setup for thermal instability. For all tested cooling curves, condensations are formed. However, the growth rates of the thermal instability are different. Also, the morphology of the formed condensation widely varies. We find fragmentation that is affected by the low-temperature treatment of the cooling curves. Condensations formed using cooling curves that vanish for temperatures lower than 20 000 K seem to be more stable against dynamical instabilities. The non-linear regime and fragmentation in the hydrodynamic case differ greatly from the MHD case. We advocate the use of modern cooling curves, based on accurate computations and up-to-date atomic parameters and solar abundances. Our bootstrap procedure can be used in future multi-dimensional simulations, to study fine-structure dynamics in solar prominences.
description: 20 pages, 21 figures, accepted for publication, corrections by language editor and improved quality of figures
Model for Vortex Pinning in a Two-Dimensional Inhomogeneous d-wave Superconductor
Creators: name: Valdez-Balderas, Daniel
name: Stroud, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a model for the pinning of vortices in a two-dimensional, inhomogeneous, Type-II superconductor in its mixed state. The model is based on a Ginzburg-Landau (GL) free energy functional whose coefficients are determined by the mean-field transition temperature T_{c0} and the zero-temperature penetration depth λ(0). We find that if (i) T_{c0} and λ(0) are functions of position, and (ii) λ^2(0) is proportional to T_{c0}^y, with y greater than 0, then the vortices tend to be pinned where T_{c0}, and hence the magnitude of the superconducting order parameter Δ, are large. This behavior is in contrast to the usual picture of pinning in Type-II superconductors, where pinning occurs in the small-gap regions. We also compute the local density of states of a model BCS Hamiltonian with d-wave symmetry, in which the pairing field is obtained from Monte Carlo simulations of a GL free energy. Several features observed in scanning tunneling spectroscopy measurements on YBa_2Cu_3O_{6+x} and Bi_2Sr_2CaCu_2O_{8+x} are well reproduced by our model: far from the cores, the local density of states spectrum has a small gap and sharp coherence peaks, while near the cores it has a larger gap with low, broad peaks. Additionally, also in agreement with experiment, the spectrum near the core does not exhibit a zero-energy peak which is, however, observed in other theoretical studies.
description: 25 pages, 11 figures. Accepted for publication in Phys. Rev. B
Superconductivity in undoped T' cuprates with Tc over 30 K
Creators: name: Matsumoto, Osamu
name: Utsuki, Aya
name: Tsukada, Akio
name: Yamamoto, Hideki
name: Manabe, Takaaki
name: Naito, Michio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Undoped cuprates have long been considered to be antiferromagnetic insulators. In this article, however, we report that superconductivity is achieved in undoped T'-RE2CuO4 (RE = Pr, Nd, Sm, Eu, and Gd). Our discovery was performed by using metal-organic decomposition (MOD), an inexpensive and easy-to-implement thin-film process. The keys to prepare the superconducting films are firing with low partial-pressure of oxygen and reduction at low temperatures. The highest Tc of undoped T'-RE2CuO4 is over 30 K, substantially higher than "electron-doped" analogs. Remarkably, Gd2CuO4, even the derivatives of which have not shown superconductivity so far, gets superconducting with Tconset as high as ~ 20 K. The implication of our discovery is briefly discussed.
description: 22 pages, 5 figures, submitted to Physical Review Letters
Effect of antiferromagnetic spin correlations on lattice distortion and charge ordering in Pr$_{0.5}$Ca$_{1.5}$MnO$_{4}$
Creators: name: Chi, Songxue
name: Ye, F.
name: Dai, Pengcheng
name: Fernandez-Baca, J. A.
name: Huang, Q.
name: Lynn, J. W.
name: Plummer, E. W.
name: Mathieu, R.
name: Kaneko, Y.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use neutron scattering to study the lattice and magnetic structure of the layered half-doped manganite Pr$_{0.5}$Ca$_{1.5}$MnO$_4$. On cooling from high temperature, the system first becomes charge- and orbital- ordered (CO/OO) near $T_{CO}=300$ K and then develops checkerboard-like antiferromagnetic (AF) order below $T_{N}=130$ K. At temperatures above $T_{N}$ but below $T_{CO}$ ($T_N
description: 7 pages, 5 figures
Cosmic Ray Physics with ACORDE at LHC
Creators: name: Pagliarone, C.
name: Fernandez-Tellez, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The use of large underground high-energy physics experiments, for comic ray studies, have been used, in the past, at CERN, in order to measure, precisely, the inclusive cosmic ray flux in the energy range from 2x10^10 - 2x10^12 eV. ACORDE, ALICE Cosmic Rays DEtector, will act as Level 0 cosmic ray trigger and, together with other ALICE apparatus, will provide precise information on cosmic rays with primary energies around 10^15 - 10^17 eV. This paper reviews the main detector features, the present status, commissioning and integration with other apparatus. Finally, we discuss the ACORDE-ALICE cosmic ray physics program.
description: Contribution to the 2007 Europhysics Conference on High Energy Physics - Manchester, England 19-25 July 2007; 3 pages, 3 figures
Asymptotically flat charged rotating dilaton black holes in higher dimensions
Creators: name: Sheykhi, A.
name: Allahverdizadeh, M.
name: Bahrampour, Y.
name: Rahnama, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find a class of asymptotically flat slowly rotating charged black hole solutions of Einstein-Maxwell-dilaton theory with arbitrary dilaton coupling constant in higher dimensions. Our solution is the correct one generalizing the four-dimensional case of Horne and Horowitz \cite{Hor1}. In the absence of a dilaton field, our solution reduces to the higher dimensional slowly rotating Kerr-Newman black hole solution. The angular momentum and the gyromagnetic ratio of these rotating dilaton black holes are computed. It is shown that the dilaton field modifies the gyromagnetic ratio of the black holes.
description: 9 pages, 1 figure
Massive Clumps in the NGC 6334 Star Forming Region
Creators: name: Munoz, Diego J.
name: Mardones, Diego
name: Garay, Guido
name: Rebolledo, David
name: Brooks, Kate
name: Bontemps, Sylvain
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report observations of dust continuum emission at 1.2 mm toward the star forming region NGC 6334 made with the SEST SIMBA bolometer array. The observations cover an area of $\sim 2$ square degrees with approximately uniform noise. We detected 181 clumps spanning almost three orders of magnitude in mass (3\Msun$-6\times10^3$ \Msun) and with sizes in the range 0.1--1.0 pc. We find that the clump mass function $dN/d\log M$ is well fit with a power law of the mass with exponent -0.6 (or equivalently $dN/dM \propto M^{-1.6}$). The derived exponent is similar to those obtained from molecular line emission surveys and is significantly different from that of the stellar initial mass function. We investigated changes in the mass spectrum by changing the assumptions on the temperature distribution of the clumps and on the contribution of free-free emission to the 1.2 mm emission, and found little changes on the exponent. The Cumulative Mass Distribution Function is also analyzed giving consistent results in a mass range excluding the high-mass end where a power-law fit is no longer valid. The masses and sizes of the clumps observed in NGC 6334 indicate that they are not direct progenitors of stars and that the process of fragmentation determines the distribution of masses later on or occurs at smaller spatial scales. The spatial distribution of the clumps in NGC 6334 reveals clustering which is strikingly similar to that exhibited by young stars in other star forming regions. A power law fit to the surface density of companions gives $Σ\propto θ^{-0.62}$.
description: 16 pages, 11 figures, 4 tables. To appear in the Astrophysical Journal
On the applicability of constrained symplectic integrators in general relativity
Creators: name: Frauendiener, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The purpose of this note is to point out that a naive application of symplectic integration schemes for Hamiltonian systems with constraints such as SHAKE or RATTLE which preserve holonomic constraints encounters difficulties when applied to the numerical treatment of the equations of general relativity.
description: 13 pages, change the title to be more descriptive, typos corrected, added reference
The Hubbard model: bosonic excitations and zero-frequency constants
Creators: name: Avella, Adolfo
name: Mancini, Ferdinando
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A fully self-consistent calculation of the bosonic dynamics of the Hubbard model is developed within the Composite Operator Method. From one side we consider a basic set of fermionic composite operators (Hubbard fields) and calculate the retarded propagators. On the other side we consider a basic set of bosonic composite operators (charge, spin and pair) and calculate the causal propagators. The equations for the Green's functions (GF) (retarded and causal), studied in the polar approximation, are coupled and depend on a set of parameters not determined by the dynamics. First, the pair sector is self-consistently solved together with the fermionic one and the zero-frequency constants (ZFC) are calculated not assuming the ergodic value, but fixing the representation of the GF in such a way to maintain the constrains required by the algebra of the composite fields. Then, the scheme to compute the charge and spin sectors, ZFCs included, is given in terms of the fermionic and pair correlators.
Algebraic points of small height missing a union of varieties
Creators: name: Fukshansky, Lenny
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G50, 11D99, 11R04, 11R58

description: Let $K$ be a number field, $\overline{\mathbb Q}$, or the field of rational functions on a smooth projective curve over a perfect field, and let $V$ be a subspace of $K^N$, $N \geq 2$. Let $Z_K$ be a union of varieties defined over $K$ such that $V \nsubseteq Z_K$. We prove the existence of a point of small height in $V \setminus Z_K$, providing an explicit upper bound on the height of such a point in terms of the height of $V$ and the degree of a hypersurface containing $Z_K$, where dependence on both is optimal. This generalizes and improves upon the previous results of the author. As a part of our argument, we provide a basic extension of the function field version of Siegel's lemma of J. Thunder to an inequality with inhomogeneous heights. As a corollary of the method, we derive an explicit lower bound for the number of algebraic integers of bounded height in a fixed number field.
description: 20 pages; revised and improved version -- in particular, the main result now stands over function fields of any genus; to appear in the Journal of Number Theory -- an earlier version also appeared in the MPIM preprint series
Solar system constraints on the Dvali-Gabadadze-Porrati braneworld theory of gravity
Creators: name: Battat, James B. R.
name: Stubbs, Christopher W.
name: Chandler, John F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A number of proposals have been put forward to account for the observed accelerating expansion of the Universe through modifications of gravity. One specific scenario, Dvali-Gabadadze-Porrati (DGP) gravity, gives rise to a potentially observable anomaly in the solar system: all planets would exhibit a common anomalous precession, dw/dt, in excess of the prediction of General Relativity. We have used the Planetary Ephemeris Program (PEP) along with planetary radar and radio tracking data to set a constraint of |dw/dt| < 0.02 arcseconds per century on the presence of any such common precession. This sensitivity falls short of that needed to detect the estimated universal precession of |dw/dt| = 5e-4 arcseconds per century expected in the DGP scenario. We discuss the fact that ranging data between objects that orbit in a common plane cannot constrain the DGP scenario. It is only through the relative inclinations of the planetary orbital planes that solar system ranging data have sensitivity to the DGP-like effect of universal precession. In addition, we illustrate the importance of performing a numerical evaluation of the sensitivity of the data set and model to any perturbative precession.
description: 9 pages, 2 figures, accepted for publication in Phys. Rev. D
Bose-Einstein Condensation of an Ytterbium Isotope
Creators: name: Fukuhara, Takeshi
name: Sugawa, Seiji
name: Takahashi, Yoshiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We report the observation of a Bose Einstein condensate in a bosonic isotope of ytterbium (170Yb). More than 10^6 atoms are trapped in a crossed optical dipole trap and cooled by evaporation. Condensates of approximately 10^4 atoms have been obtained. From an expansion of the condensate, we have extracted the scattering length a=3.6(9) nm.
description: 4 pages, 3 figures
Separability of a family of one parameter W and GHZ multiqubit states using Abe-Rajagopal q-conditional entropy approach
Creators: name: Prabhu, R.
name: Devi, A. R. Usha
name: Padmanabha, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We employ conditional Tsallis q entropies to study the separability of symmetric one parameter W and GHZ multiqubit mixed states. The strongest limitation on separability is realized in the limit q-->infinity, and is found to be much superior to the condition obtained using the von Neumann conditional entropy (q=1 case). Except for the example of two qubit and three qubit symmetric states of GHZ family, the $q$-conditional entropy method leads to sufficient - but not necessary - conditions on separability.
description: 7 pages, 5 ps figures, RevteX, Accepted for publication in Physical Review A
Measurement of the solar 8B neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector
Creators: name: The Borexino Collaboration
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report the measurement of electron neutrino elastic scattering from 8B solar neutrinos with 3 MeV energy threshold by the Borexino detector in Gran Sasso (Italy). The rate of solar neutrino-induced electron scattering events above this energy in Borexino is 0.217 +- 0.038 (stat) +- 0.008 (syst) cpd/100 t, which corresponds to the equivalent unoscillated flux of (2.4 +- 0.4 (stat) +- 0.1 (syst))x10^6 cm^-2 s^-1, in good agreement with measurements from SNO and SuperKamiokaNDE. Assuming the 8B neutrino flux predicted by the high metallicity Standard Solar Model, the average 8B neutrino survival probability above 3 MeV is measured to be 0.29+-0.10. The survival probabilities for 7Be and 8B neutrinos as measured by Borexino differ by 1.9 sigma. These results are consistent with the prediction of the MSW-LMA solution of a transition in the solar electron neutrino survival probability between the low energy vacuum-driven and the high-energy matter-enhanced solar neutrino oscillation regimes.
description: 10 pages, 8 figures, 6 tables
Brane Solutions in Time Dependent Backgrounds in D = 11 Supergravity and in Type II String Theories
Creators: name: Gupta, Srikumar Sen
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We obtain explicit time dependent brane solutions in M-theory as well as in string theory by solving the reduced equations of motion (which follow from 11-d supergravity) for a class of brane solutions in curved backgrounds. The behaviour of our solutions in both asymptotic and near-horizon limits are studied. It is shown that our time dependent solutions serve as explicit examples of branes in singular, cosmological backgrounds. In some special cases the asymptotic and the boundary AdS solutions can be identified as Milne X R^n spacetime.
description: 20 pages
On the Center of Mass of Isolated Systems with General Asymptotics
Creators: name: Huang, Lan-Hsuan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We propose a definition of center of mass for asymptotically flat manifolds satisfying Regge-Teitelboim condition at infinity. This definition has a coordinate-free expression and natural properties. Furthermore, we prove that our definition is consistent both with the one proposed by Corvino and Schoen and another by Huisken and Yau. The main tool is a new density theorem for data satisfying the Regge-Teitelboim condition.
description: Final version
Strongly Blueshifted Phenomena Observed with {\it Hinode}/EIS in the 2006 December 13 Solar Flare
Creators: name: Asai, Ayumi
name: Hara, Hirohisa
name: Watanabe, Tetsuya
name: Imada, Shinsuke
name: Sakao, Taro
name: Narukage, Noriyuki
name: Culhane, J. L.
name: Doschek, G. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a detailed examination of strongly blueshifted emission lines observed with the EUV Imaging Spectrometer on board the {\it Hinode} satellite. We found two kinds of blueshifted phenomenon associated with the X3.4 flare that occurred on 2006 December 13. One was related to a plasmoid ejection seen in soft X-rays. It was very bright in all the lines used for the observations. The other was associated with the faint arc-shaped ejection seen in soft X-rays. The soft X-ray ejection is thought to be an MHD fast-mode shock wave. This is therefore the first spectroscopic observation of an MHD fast-mode shock wave associated with a flare.
description: 18 pages, 1 table, 6 figures. ApJ, accepted
Experimental observation of strong photon localization in disordered photonic crystal waveguides
Creators: name: Topolancik, Juraj
name: Ilic, Rob
name: Vollmer, Frank
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We demonstrate experimentally that structural perturbations imposed on highly-dispersive photonic crystal-based waveguides give rise to spectral features that bear signatures of Anderson localization. Sharp resonances with the effective Qs of over 30,000 are found in scattering spectra of disordered waveguides. The resonances are observed in a ~20-nm bandwidth centered at the cutoff of slowly-guided Bloch-modes. Their origin can be explained with interference of coherently scattered electromagnetic waves which results in the formation of a narrow impurity (or localization) band populated with spectrally distinct quasistates. Standard photon localization criteria are fulfilled in the localization band.
description: first submitted to PRL on April 20th, 2007; 16 pages, 4 figures
A 1D-CNN Based Deep Learning Technique for Sleep Apnea Detection in IoT Sensors
Creators: name: John, Arlene
name: Cardiff, Barry
name: John, Deepu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Internet of Things (IoT) enabled wearable sensors for health monitoring are widely used to reduce the cost of personal healthcare and improve quality of life. The sleep apnea-hypopnea syndrome, characterized by the abnormal reduction or pause in breathing, greatly affects the quality of sleep of an individual. This paper introduces a novel method for apnea detection (pause in breathing) from electrocardiogram (ECG) signals obtained from wearable devices. The novelty stems from the high resolution of apnea detection on a second-by-second basis, and this is achieved using a 1-dimensional convolutional neural network for feature extraction and detection of sleep apnea events. The proposed method exhibits an accuracy of 99.56% and a sensitivity of 96.05%. This model outperforms several lower resolution state-of-the-art apnea detection methods. The complexity of the proposed model is analyzed. We also analyze the feasibility of model pruning and binarization to reduce the resource requirements on a wearable IoT device. The pruned model with 80\% sparsity exhibited an accuracy of 97.34% and a sensitivity of 86.48%. The binarized model exhibited an accuracy of 75.59% and sensitivity of 63.23%. The performance of low complexity patient-specific models derived from the generic model is also studied to analyze the feasibility of retraining existing models to fit patient-specific requirements. The patient-specific models on average exhibited an accuracy of 97.79% and sensitivity of 92.23%. The source code for this work is made publicly available.
description: Accepted for discussion at the IEEE International Symposium on Circuits and Systems (ISCAS) 2021
3D SPH simulations of grain growth in protoplanetary disks
Creators: name: Laibe, Guillaume
name: Gonzalez, Jean-François
name: Fouchet, Laure
name: Maddison, Sarah T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first results of the treatment of grain growth in our 3D, two-fluid (gas+dust) SPH code describing protoplanetary disks. We implement a scheme able to reproduce the variation of grain sizes caused by a variety of physical processes and test it with the analytical expression of grain growth given by Stepinski & Valageas (1997) in simulations of a typical T Tauri disk around a one solar mass star. The results are in agreement with a turbulent growing process and validate the method. We are now able to simulate the grain growth process in a protoplanetary disk given by a more realistic physical description, currently under development. We discuss the implications of the combined effect of grain growth and dust vertical settling and radial migration on subsequent planetesimal formation.
description: 6 pages, 4 figures, to appear in the proceedings of "SF2A-2007: Semaine de l'Astrophysique Francaise", (J. Bouvier, A. Chalabaev, and C. Charbonnel eds)