Fe/V and Fe/Co (001) superlattices: growth, anisotropy, magnetisation and magnetoresistance

Some physical properties of bcc Fe/V and Fe/Co (001) superlattices are reviewed. The dependence of the magnetic anisotropy on the in-plane strain introduced by the lattice mismatch between Fe and V is measured and compared to a theoretical derivation. The dependence of the magnetic anisotropy (and saturation magnetisation) on the layer thickness ratio Fe/Co is measured and a value for the anisotropy of bcc Co is derived from extrapolation. The interlayer exchange coupling of Fe/V superlattices is studied as a function of the layer thickness V (constant Fe thickness) and layer thickness of Fe (constant V thickness). A region of antiferromagnetic coupling and GMR is found for V thicknesses 12-14 monolayers. However, surprisingly, a 'cutoff' of the antiferromagnetic coupling and GMR is found when the iron layer thickness exceeds about 10 monolayers.Comment: Proceedings of the International Symposium on Advanced Magnetic Materials (ISAMM'02), October 2-4, 2002, Halong Bay, Vietnam. REVTeX style; 4 pages, 5 figure

KINEMATICS OF CLEAR IN JUNIOR BADMINTON PLAYERS

Introduction the motion of rotating body segments of different shots in badminton can be described in terms of angular position, displacement, velocity or acceleration. The linear velocity of the rotating racket hitting the shuttle is directly proportional to the sum of both the angular velocity and the radius of rotation of the consecutive body segments in badminton strokes (Lee 1993). The timing of these consecutive rotational movements is important in relation to the hit of the racket with the shuttle (Gowitzke 1979).The linear momentum of the clearing arm and racket transfers to the shuttle according to the analogy of the force impulse and the change of linear momentum. The purpose of the present preliminary research was to' study the release velocity of the shuttle in maximal clear placing the shuttle on the opponent scourt in junior badminton players, to explain the produced angular and linear velocities and accelerations in the racket, hand, forearm, upper arm and trunk. METHODS Ten volunteer junior badminton player strained to perform maximal clears on the court. For motion analysis subjects performed a minimum of five successful clears. The fastest clear of every subject was selected for detailed analysis. Anthropometric data (Mean+S.D.) for the subjects was as follows: age 12.223.3years, height 1.562k0.137 m and mass46.85 11.0 kg. On average, they had training 1.851.7 years in badminton. Each clear was recorded for 3 D analysis with NAC 400 (side view) high speed video(100 fps) and Magnavox (back view)camcorder (60 fps). The optical axis of the cameras were perpendicular. The calibration scaling frame was rectangular with the dimensions of 2.0 m x 2.0-m x3.0 m. The same racket and shuttle were used in all measurements. An APAS was used to process frame crabbing, digitizing, smoothing (DLT) and transformation. The mechanical model of trunk, head, upper arm, lower arm and hand (twelwe points) was combined with the racket (four points) and shuttle. A descriptive analysis was performed on the differences in instantaneous positions, linear and rotational velocities. RESULTS The maximal release velocities of the shuttle were in the youngest subject (8years) and oldest one (19 years) 20.2and 56.0 ms-', respectively. The maximal linear velocities in the youngest and oldest subject were as follows: racket head 15.9 and 44.0 ms-' , wrist 4.7 and10.8 ms-', elbow 2.5 and 5.9 ms-' and shoulder 1.6 and 2.9 ms-', respectively. CONCLUSION In conclusion, the most experienced subject produced high speed for the shuttle through the kinematic chain of body segments with high angular and linear velocity through the impact of the shuttle and racket. The correct timing pattern of the consecutive body segments was also observed. The lengths and high angular velocities of the body segments were advantageous features for badminton players. REFERENCES Gowitzke, B.A. (1979) In: Science in Racquet Sports. J.Terauds (ed.) pp. 7-1 5.Del Mar, CA: Academic Publishers.Lee, K.B. (1993) In: Biomechanics inSports XI, J. Hamill. T.R. Derrick & E.H.Elliott (eds), pp. 239-242, University of Masschusetts, Amherst, MA

ASO Author Reflections : Registry-Based Analysis of Radiation-Associated Angiosarcoma of the Breast Provides Unbiased Insights into this Disease

Non peer reviewe

ArCo: the Italian Cultural Heritage Knowledge Graph

ArCo is the Italian Cultural Heritage knowledge graph, consisting of a network of seven vocabularies and 169 million triples about 820 thousand cultural entities. It is distributed jointly with a SPARQL endpoint, a software for converting catalogue records to RDF, and a rich suite of documentation material (testing, evaluation, how-to, examples, etc.). ArCo is based on the official General Catalogue of the Italian Ministry of Cultural Heritage and Activities (MiBAC) - and its associated encoding regulations - which collects and validates the catalogue records of (ideally) all Italian Cultural Heritage properties (excluding libraries and archives), contributed by CH administrators from all over Italy. We present its structure, design methods and tools, its growing community, and delineate its importance, quality, and impact

Generating human-computer micro-task workflows from domain ontologies

With the growing popularity of micro-task crowdsourcing platforms, a renewed interest in the resolution of complex tasks that require the coopera-tion of human and machine participants has emerged. This interest has led to workflow approaches that present new challenges at different dimensions of the human-machine computation process, namely in micro-task specification and human-computer interaction due to the unstructured nature of micro-tasks in terms of domain representation. In this sense, a semi-automatic generation envi-ronment for human-computer micro-task workflows from domain ontologies is proposed. The structure and semantics of the domain ontology provides a com-mon ground for understanding and enhances human-computer cooperation.This work is partially funded by FEDER Funds and by the ERDF (European Regional Development Fund) through the COMPETE Programme (operational programme for competitiveness) and by National Funds through the FCT (Portuguese Foundation for Science and Technology) under the projects AAL4ALL (QREN13852) and FCOMP-01-0124-FEDER-028980 (PTDC/EEI-SII/1386/2012)

Constraining dark energy fluctuations with supernova correlations

We investigate constraints on dark energy fluctuations using type Ia supernovae. If dark energy is not in the form of a cosmological constant, that is if the equation of state is not equal to -1, we expect not only temporal, but also spatial variations in the energy density. Such fluctuations would cause local variations in the universal expansion rate and directional dependences in the redshift-distance relation. We present a scheme for relating a power spectrum of dark energy fluctuations to an angular covariance function of standard candle magnitude fluctuations. The predictions for a phenomenological model of dark energy fluctuations are compared to observational data in the form of the measured angular covariance of Hubble diagram magnitude residuals for type Ia supernovae in the Union2 compilation. The observational result is consistent with zero dark energy fluctuations. However, due to the limitations in statistics, current data still allow for quite general dark energy fluctuations as long as they are in the linear regime.Comment: 18 pages, 6 figures, matches the published versio

Does the shoe fit? Real versus imagined ecological footprints

Linus Blomqvist, Barry W. Brook, Erle C. Ellis, Peter M. Kareiva, Ted Nordhaus, Michael Shellenberge

Broadband distortion modeling in Lyman-α\alpha forest BAO fitting

In recent years, the Lyman-$\alpha$ absorption observed in the spectra of high-redshift quasars has been used as a tracer of large-scale structure by means of the three-dimensional Lyman-$\alpha$ forest auto-correlation function at redshift $z\simeq 2.3$, but the need to fit the quasar continuum in every absorption spectrum introduces a broadband distortion that is difficult to correct and causes a systematic error for measuring any broadband properties. We describe a $k$-space model for this broadband distortion based on a multiplicative correction to the power spectrum of the transmitted flux fraction that suppresses power on scales corresponding to the typical length of a Lyman-$\alpha$ forest spectrum. Implementing the distortion model in fits for the baryon acoustic oscillation (BAO) peak position in the Lyman-$\alpha$ forest auto-correlation, we find that the fitting method recovers the input values of the linear bias parameter $b_{F}$ and the redshift-space distortion parameter $\beta_{F}$ for mock data sets with a systematic error of less than 0.5\%. Applied to the auto-correlation measured for BOSS Data Release 11, our method improves on the previous treatment of broadband distortions in BAO fitting by providing a better fit to the data using fewer parameters and reducing the statistical errors on $\beta_{F}$ and the combination $b_{F}(1+\beta_{F})$ by more than a factor of seven. The measured values at redshift $z=2.3$ are $\beta_{F}=1.39^{+0.11\ +0.24\ +0.38}_{-0.10\ -0.19\ -0.28}$and$b_{F}(1+\beta_{F})=-0.374^{+0.007\ +0.013\ +0.020}_{-0.007\ -0.014\ -0.022}$(1$\sigma$, 2$\sigma$and 3$\sigma$ statistical errors). Our fitting software and the input files needed to reproduce our main results are publicly available.Comment: 28 pages, 15 figures, matches the published versio