Real time plasma equilibrium reconstruction in a Tokamak

The problem of equilibrium of a plasma in a Tokamak is a free boundary problemdescribed by the Grad-Shafranov equation in axisymmetric configurations. The right hand side of this equation is a non linear source, which represents the toroidal component of the plasma current density. This paper deals with the real time identification of this non linear source from experimental measurements. The proposed method is based on a fixed point algorithm, a finite element resolution, a reduced basis method and a least-square optimization formulation

Employee Involvement Climate and Climate Strength: A study of employee attitudes and organizational effectiveness in UK hospitals

Purpose – Addressing the continuing productivity challenge the purpose of this paper is to analyze data from the National Health Service (NHS) on employee involvement (EI) in order to gain critical insights into how employees’ shared perception of employee involvement in organizational decision-making (labelled EI climate) might address two persistent issues: how to enhance positive staff attitudes and improve organizational performance. In doing so we respond to recent calls for more multilevel research and extend previous research on EI climate by attending to both EI climate level and EI climate strength. Design/methodology/approach – Data from 4702 employees nested in 33 UK hospitals was used to test the moderating role of EI climate strength in the (a) crosslevel EI climate level-employee attitudes relationship and in the (b) organizationallevel EI climate-organizational effectiveness relationship. Findings – The results of the multilevel analyses showed that EI climate level was positively associated with individual-level employee attitudes (i.e. job satisfaction, affective commitment). Further the results of the hierarchical regression analysis and the ordinal logistic regression analysis showed that EI climate level was also related to organizational effectiveness (i.e. lower outpatient waiting times; higher performance quality). In addition, both analyses demonstrated the moderating role of EI climate strength, in that the positive impact of EI climate level on employee attitudes and organizational effectiveness was more marked in the presence of a strong compared to a weak EI climate. Practical implications – By creating and maintaining a positive and strong climate for involvement hospital managers can tackle the productivity challenge that UK hospitals and health care institutions more generally are currently facing while improving the attitudes of their employees who are critical in the transformative process and ultimately underpin organizational success. Originality/value – This is the first study which provides evidence that favorable and consistent collective recognition of EI opportunities by staff contributes to enhance both employee attitudes and hospital performance. Results highlight the role of EI climate strength and underscore its importance in future research and practice

Assessing The Impact of Body Fat Percentage And Lean Mass, on Wingate Performance

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An Analysis of Governed vs Different Focal Points on Vertical Jump Performance in Collegiate Males

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Phonon surface mapping of graphite: disentangling quasi--degenerate phonon dispersions

The two-dimensional mapping of the phonon dispersions around the $K$ point of graphite by inelastic x-ray scattering is provided. The present work resolves the longstanding issue related to the correct assignment of transverse and longitudinal phonon branches at $K$. We observe an almost degeneracy of the three TO, LA and LO derived phonon branches and a strong phonon trigonal warping. Correlation effects renormalize the Kohn anomaly of the TO mode, which exhibits a trigonal warping effect opposite to that of the electronic band structure. We determined the electron--phonon coupling constant to be 166$\rm(eV/\AA)^2$ in excellent agreement to $GW$ calculations. These results are fundamental for understanding angle-resolved photoemission, double--resonance Raman and transport measurements of graphene based systems

Inelastic x-ray scattering investigations of lattice dynamics in SmFeAsO1−x_{1-x}Fy_y superconductors

We report measurements of the phonon density of states as measured with inelastic x-ray scattering in SmFeAsO$_{1-x}$F$_y$ powders. An unexpected strong renormalization of phonon branches around 23 meV is observed as fluorine is substituted for oxygen. Phonon dispersion measurements on SmFeAsO$_{1-x}$F$_y$ single crystals allow us to identify the 21 meV A$_{1g}$ in-phase (Sm,As) and the 26 meV B$_{1g}$ (Fe,O) modes to be responsible for this renormalization, and may reveal unusual electron-phonon coupling through the spin channel in iron-based superconductors.Comment: 4 pages, 3 figures, submitted for SNS2010 conference proceeding

The Impact of a 30 vs. 60 Second Passive Recovery Period on Vertical Jump Performance

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The phonon dispersion of graphite by inelastic x-ray scattering

We present the full in-plane phonon dispersion of graphite obtained from inelastic x-ray scattering, including the optical and acoustic branches, as well as the mid-frequency range between the $K$ and $M$ points in the Brillouin zone, where experimental data have been unavailable so far. The existence of a Kohn anomaly at the $K$ point is further supported. We fit a fifth-nearest neighbour force-constants model to the experimental data, making improved force-constants calculations of the phonon dispersion in both graphite and carbon nanotubes available.Comment: 7 pages; submitted to Phys. Rev.