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Sample records for lattice improved actions

  1. Improved actions, redundant operators and scaling in lattice SU(3)

    NASA Astrophysics Data System (ADS)

    Patel, Apoorva; Gupta, Rajan

    1987-01-01

    Schwinger-Dyson equations are used to systematically calculate redundant operators in lattice QCD and their role in perturbatively improved actions is analyzed. The criteria for improved actions in Monte Carlo simulations are discussed and their usefulness also. In particular the renormalized trajectory is estimated for the b = sqrt(3) renormalization group transformation in a four-parameter space and its scaling behavior is studied for future use in spectrum calculations. J. Robert Oppenheimer Fellow.

  2. A More improved lattice action for heavy quarks

    SciTech Connect

    M. B. Oktay et al.

    2004-03-17

    We extend the Fermilab formalism for heavy quarks to develop a more improved action. We give results of matching calculations of the improvement couplings at tree level. Finally, we estimate the discretization errors associated with the new action.

  3. Improved gauge actions on anisotropic lattices I. Study of fundamental parameters in the weak coupling limit

    NASA Astrophysics Data System (ADS)

    Sakai, S.; Saito, T.; Nakamura, A.

    2000-09-01

    On anisotropic lattices with the anisotropy ξ=a σ/a τ the following basic parameters are calculated by perturbative method: (1) the renormalization of the gauge coupling in spatial and temporal directions, g σ and g τ, (2) the Λ parameter, (3) the ratio of the renormalized and bare anisotropy η=ξ/ξ B and (4) the derivatives of the coupling constants with respect to ξ, ∂g σ-2/∂ξ and ∂g τ-2/∂ξ . We employ the improved gauge actions which consist of plaquette and six-link rectangular loops, c 0P(1×1) μν+c 1P(1×2) μν. This class of actions covers Symanzik, Iwasaki and DBW2 actions. The ratio η shows an impressive behavior as a function of c 1, i.e., η>1 for the standard Wilson and Symanzik actions, while η<1 for Iwasaki and DBW2 actions. This is confirmed non-perturbatively by numerical simulations in weak coupling regions. The derivatives ∂g -2τ/∂ξ and ∂g -2σ/∂ξ also change sign as -c 1 increases. For Iwasaki and DBW2 actions they become opposite sign to those for standard and Symanzik actions. However, their sum is independent of the type of actions due to Karsch's sum rule.

  4. Topological lattice actions

    NASA Astrophysics Data System (ADS)

    Bietenholz, W.; Gerber, U.; Pepe, M.; Wiese, U.-J.

    2010-12-01

    We consider lattice field theories with topological actions, which are invariant against small deformations of the fields. Some of these actions have infinite barriers separating different topological sectors. Topological actions do not have the correct classical continuum limit and they cannot be treated using perturbation theory, but they still yield the correct quantum continuum limit. To show this, we present analytic studies of the 1-d O(2) and O(3) model, as well as Monte Carlo simulations of the 2-d O(3) model using topological lattice actions. Some topological actions obey and others violate a lattice Schwarz inequality between the action and the topological charge Q. Irrespective of this, in the 2-d O(3) model the topological susceptibility {χ_t} = {{{left< {{Q^2}} rightrangle }} left/ {V} right.} is logarithmically divergent in the continuum limit. Still, at non-zero distance the correlator of the topological charge density has a finite continuum limit which is consistent with analytic predictions. Our study shows explicitly that some classically important features of an action are irrelevant for reaching the correct quantum continuum limit.

  5. Calculation of K →π π decay amplitudes with improved Wilson fermion action in lattice QCD

    NASA Astrophysics Data System (ADS)

    Ishizuka, N.; Ishikawa, K.-I.; Ukawa, A.; Yoshié, T.

    2015-10-01

    We present our result for the K →π π decay amplitudes for both the Δ I =1 /2 and 3 /2 processes with the improved Wilson fermion action. Expanding on the earlier works by Bernard et al. and by Donini et al., we show that mixings with four-fermion operators with wrong chirality are absent even for the Wilson fermion action for the parity odd process in both channels due to CPS symmetry. Therefore, after subtraction of an effect from the lower dimensional operator, a calculation of the decay amplitudes is possible without complications from operators with wrong chirality, as for the case with chirally symmetric lattice actions. As a first step to verify the possibility of calculations with the Wilson fermion action, we consider the decay amplitudes at an unphysical quark mass mK˜2 mπ . Our calculations are carried out with Nf=2 +1 gauge configurations generated with the Iwasaki gauge action and nonperturbatively O (a )-improved Wilson fermion action at a =0.091 fm , mπ=280 MeV , and mK=580 MeV on a 323×64 (L a =2.9 fm ) lattice. For the quark loops in the penguin and disconnected contributions in the I =0 channel, the combined hopping parameter expansion and truncated solver method work very well for variance reduction. We obtain, for the first time with a Wilson-type fermion action, that Re A0=60 (36 )×1 0-8 GeV and Im A0=-67 (56 )×1 0-12 GeV for a matching scale q*=1 /a . The dependence on the matching scale q* for these values is weak.

  6. Bulk first-order phase transition in three-flavor lattice QCD with O(a)-improved Wilson fermion action at zero temperature

    SciTech Connect

    Aoki, S.; Iwasaki, Y.; Fukugita, M.; Hashimoto, S.; Kaneko, T.; Tsutsui, N.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Kanaya, K.; Kuramashi, Y.; Ukawa, A.; Yoshie, T.; Yamada, N.

    2005-09-01

    Three-flavor QCD simulation with the O(a)-improved Wilson fermion action is made employing an exact fermion algorithm developed for an odd number of quark flavors. For the plaquette gauge action, an unexpected first-order phase transition is found in the strong coupling regime ({beta} < or approx. 5.0) at relatively heavy quark masses (m{sub PS}/m{sub V}{approx}0.74-0.87). Strong metastability persists on a large lattice of size 12{sup 3}x32, which indicates that the transition has a bulk nature. The phase gap becomes smaller toward weaker couplings and vanishes at {beta}{approx_equal}5.0, which corresponds to a lattice spacing a{approx_equal}0.1 fm. These results imply that realistic simulations of QCD with three flavors of dynamical Wilson-type fermions at lattice spacings in the range a=0.1-0.2 fm are not possible with the plaquette gauge action. Extending the study to improved gauge actions, we do not observe evidence for first-order phase transition, at least within the ({beta},{kappa}) range we explored. This suggests the possibility that the phase transition either moves away or weakens with improved gauge actions. Possible origins of the phase transition are discussed.

  7. THERMODYNAMICS OF TWO-FLAVOR LATTICE QCD WITH AN IMPROVED WILSON QUARK ACTION AT NON-ZERO TEMPERATURE AND DENSITY.

    SciTech Connect

    MAEZAWA,Y.; AOKI, S.; EJIRI, S.; HATSUDA, T.; ISHII, N.; KANAYA, K.; UKITA, N.

    2006-11-14

    The authors report the current status of the systematic studies of the QCD thermodynamics by lattice QCD simulations with two flavors of improved Wilson quarks. They evaluate the critical temperature of two flavor QCD in the chiral limit at zero chemical potential and show the preliminary result. Also they discuss fluctuations at none-zero temperature and density by calculating the quark number and isospin susceptibilities and their derivatives with respect to chemical potential.

  8. Application of Fixed Scale Approach to Static Quark Free Energies in Quenched and 2+1 Flavor Lattice QCD with Improved Wilson Quark Action

    NASA Astrophysics Data System (ADS)

    Maezawa, Y.; Umeda, T.; Aoki, S.; Ejiri, S.; Hatsuda, T.; Kanaya, K.; Ohno, H.; WHOT-QCD Collaboration

    2012-11-01

    The free energies of static quarks and the Debye screening masses in the quark gluon plasma are studied using Polyakov-line correlation functions in lattice QCD adopting the fixed-scale approach in which temperature is varied without changing the spatial volume and the renormalization factors. We calculate static-quark free energies in various color channels in the high temperature phase up to about 3.5 times the (pseudo-)critical temperature, performing lattice simulations both in quenched and 2 + 1 flavor QCD. For the quenched simulations, we adopt the plaquette gauge action on anisotropic 20^3 × N_t lattices with N_t = 8-26 at the renormalized anisotropy a_s / a_t ≃ 4. For 2 + 1 flavor QCD, we adopt the renormalization-group improved Iwasaki gluon action and the non-perturbatively O(a)-improved Wilson quark action on isotropic 32^3 × N_t lattices with N_t = 4-12 at m_{PS}/m_{V} = 0.63 (0.74) for the light (strange) flavors. We find that the color-singlet free energies at high temperatures converge to the zero-temperature static-quark potential evaluated from the Wilson-loop at short distances. This is in accordance with the theoretical expectation that the short distance physics is insensitive to the temperature. At long distances, the free energies approach twice the single-quark free energies, implying that the interaction between static quarks is fully screened. We find that the static-quark free energies for various color channels turn out to be well described by the screened Coulomb form, and the color-channel dependence of the inter-quark interaction can be described by the kinetic Casimir factor inspired from the lowest order perturbation theory. We also discuss comparison with a prediction of the thermal perturbation theory and flavor dependence of the screening masses.

  9. Renormalized action improvements

    SciTech Connect

    Zachos, C.

    1984-01-01

    Finite lattice spacing artifacts are suppressed on the renormalized actions. The renormalized action trajectories of SU(N) lattice gauge theories are considered from the standpoint of the Migdal-Kadanoff approximation. The minor renormalized trajectories which involve representations invariant under the center are discussed and quantified. 17 references.

  10. New lattice action for heavy quarks

    SciTech Connect

    Oktay, Mehmet B.; Kronfeld, Andreas S.

    2008-03-01

    We extend the Fermilab method for heavy quarks to include interactions of dimension six and seven in the action. There are, in general, many new interactions, but we carry out the calculations needed to match the lattice action to continuum QCD at the tree level, finding six non-zero couplings. Using the heavy-quark theory of cutoff effects, we estimate how large the remaining discretization errors are. We find that our tree-level matching, augmented with one-loop matching of the dimension-five interactions, can bring these errors below 1%, at currently available lattice spacings.

  11. Perturbative renormalization factors and O(a2) corrections for lattice four-fermion operators with improved fermion/gluon actions

    NASA Astrophysics Data System (ADS)

    Constantinou, Martha; Dimopoulos, Petros; Frezzotti, Roberto; Lubicz, Vittorio; Panagopoulos, Haralambos; Skouroupathis, Apostolos; Fotos Stylianou

    2011-04-01

    In this work we calculate the corrections to the amputated Green’s functions of four-fermion operators, in 1-loop lattice perturbation theory. One of the novel aspects of our calculations is that they are carried out to second order in the lattice spacing, O(a2). We employ the Wilson/clover action for massless fermions (also applicable for the twisted mass action in the chiral limit) and a family of Symanzik improved actions for gluons. Our calculations have been carried out in a general covariant gauge. Results have been obtained for several popular choices of values for the Symanzik coefficients (Plaquette, Tree-level Symanzik, Iwasaki, TILW and DBW2 action). While our Green’s function calculations regard any pointlike four-fermion operators which do not mix with lower dimension ones, we pay particular attention to ΔF=2 operators, both parity conserving and parity violating (F stands for flavor: S, C, B). By appropriately projecting those bare Green’s functions we compute the perturbative renormalization constants for a complete basis of four-fermion operators and we study their mixing pattern. For some of the actions considered here, even O(a0) results did not exist in the literature to date. The correction terms which we calculate (along with our previous O(a2) calculation of ZΨ [M. Constantinou, V. Lubicz, H. Panagopoulos, and F. Stylianou, J. High Energy Phys.JHEPFG1029-8479 10 (2009) 064.10.1088/1126-6708/2009/10/064][M. Constantinou, P. Dimopoulos, R. Frezzotti, G. Herdoiza, K. Jansen, V. Lubicz, H. Panagopoulos, G. C. Rossi, S. Simula, F. Stylianou, and A. Vladikas, J. High Energy Phys.JHEPFG1029-8479 08 (2010) 068.10.1007/JHEP08(2010)068][C. Alexandrou, M. Constantinou, T. Korzec, H. Panagopoulos, and F. Stylianou (unpublished).]) are essential ingredients for minimizing the lattice artifacts which are present in nonperturbative evaluations of renormalization constants with the RI'-MOM method. Our perturbative results, for the matrix elements of

  12. Perturbative renormalization factors and O(a{sup 2}) corrections for lattice four-fermion operators with improved fermion/gluon actions

    SciTech Connect

    Constantinou, Martha; Panagopoulos, Haralambos; Skouroupathis, Apostolos; Stylianou, Fotos; Dimopoulos, Petros; Frezzotti, Roberto

    2011-04-01

    In this work we calculate the corrections to the amputated Green's functions of four-fermion operators, in 1-loop lattice perturbation theory. One of the novel aspects of our calculations is that they are carried out to second order in the lattice spacing, O(a{sup 2}). We employ the Wilson/clover action for massless fermions (also applicable for the twisted mass action in the chiral limit) and a family of Symanzik improved actions for gluons. Our calculations have been carried out in a general covariant gauge. Results have been obtained for several popular choices of values for the Symanzik coefficients (Plaquette, Tree-level Symanzik, Iwasaki, TILW and DBW2 action). While our Green's function calculations regard any pointlike four-fermion operators which do not mix with lower dimension ones, we pay particular attention to {Delta}F=2 operators, both parity conserving and parity violating (F stands for flavor: S, C, B). By appropriately projecting those bare Green's functions we compute the perturbative renormalization constants for a complete basis of four-fermion operators and we study their mixing pattern. For some of the actions considered here, even O(a{sup 0}) results did not exist in the literature to date. The correction terms which we calculate (along with our previous O(a{sup 2}) calculation of Z{sub {Psi}}[M. Constantinou, V. Lubicz, H. Panagopoulos, and F. Stylianou, J. High Energy Phys. 10 (2009) 064.][M. Constantinou, P. Dimopoulos, R. Frezzotti, G. Herdoiza, K. Jansen, V. Lubicz, H. Panagopoulos, G. C. Rossi, S. Simula, F. Stylianou, and A. Vladikas, J. High Energy Phys. 08 (2010) 068.][C. Alexandrou, M. Constantinou, T. Korzec, H. Panagopoulos, and F. Stylianou (unpublished).]) are essential ingredients for minimizing the lattice artifacts which are present in nonperturbative evaluations of renormalization constants with the RI{sup '}-MOM method. Our perturbative results, for the matrix elements of {Delta}F=2 operators and for the corresponding

  13. SU(3) lattice gauge autocorrelations with anisotropic action

    NASA Astrophysics Data System (ADS)

    Draper, Terrence; Nenkov, Constantine; Peardon, Mike

    1997-02-01

    We report results of autocorrelation measurements in pure SU(3) lattice gauge theory. The computations are performed on the CONVEX SPP1200 parallel platform within the CANOPY programming environment. The focus of our analysis is on typical autocorrelation times and optimization of the mixing ratio between overrelaxation and pseudo-heatbath sweeps for generating gauge field configurations. We study second order tadpole-improved approximation of the Wilson action in the gluon sector, which offers the advantage on smaller lattices (8 3 × 16 and 6 3 × 12 - 30). We also make use of anisotropic lattices, with temporal lattice spacing smaller than the spatial spacing, which prove useful for calculating noisy correlation functions with large spatial lattice discretization (of the order of 0.4 fm).

  14. Action Research for School Improvement.

    ERIC Educational Resources Information Center

    Calhoun, Emily J.

    2002-01-01

    Describes the use of structured action research for the professional development of teachers. Describes how a high school used structured action research to improve reading comprehension. Includes a sample schoolwide action-research matrix. (Contains 14 references.) (PKP)

  15. Topological susceptibility with the improved Asqtad action

    SciTech Connect

    C. Bernard et al.

    2004-01-06

    As a test of the chiral properties of the improved Asqtad (staggered fermion) action, we have been measuring the topological susceptibility as a function of quark masses for 2 + 1 dynamical flavors. We report preliminary results, which show reasonable agreement with leading order chiral perturbation theory for lattice spacing less than 0.1 fm. The total topological charge, however, shows strong persistence over Monte Carlo time.

  16. Improved models of dense anharmonic lattices

    NASA Astrophysics Data System (ADS)

    Rosenau, P.; Zilburg, A.

    2017-01-01

    We present two improved quasi-continuous models of dense, strictly anharmonic chains. The direct expansion which includes the leading effect due to lattice dispersion, results in a Boussinesq-type PDE with a compacton as its basic solitary mode. Without increasing its complexity we improve the model by including additional terms in the expanded interparticle potential with the resulting compacton having a milder singularity at its edges. A particular care is applied to the Hertz potential due to its non-analyticity. Since, however, the PDEs of both the basic and the improved model are ill posed, they are unsuitable for a study of chains dynamics. Using the bond length as a state variable we manipulate its dispersion and derive a well posed fourth order PDE.

  17. The kaon B-parameter from unquenched mixed action lattice QCD

    SciTech Connect

    Aubin, Christopher A.; Laiho, Jack; Van de Water, Ruth S.

    2007-10-01

    We present a preliminary calculation of B{sub K} using domain-wall valence quarks and 2+1 flavors of improved staggered sea quarks. Both the size of the residual quark mass, which measures the amount of chiral symmetry breaking, and of the mixed meson splitting Delta{sub mix}, a measure of taste-symmetry breaking, show that discretization effects are under control in our mixed action lattice simulations. We show preliminary data for pseudoscalar meson masses, decay constants and B{sub K}. We discuss general issues associated with the chiral extrapolation of lattice data, and, as an example, present a preliminary chiral and continuum extrapolation of f{sub pi}. The quality of our data shows that the good chiral properties of domain-wall quarks, in combination with the light sea quark masses and multiple lattice spacings available with the MILC staggered configurations, will allow for a precise determination of B{sub K}.

  18. Excited nucleon spectrum using non-perturbative improved clover action

    SciTech Connect

    D. G. Richards; M. Gockeler; R. Horsley; D. Pleiter; P. E. L. Rakow; G. Schierholz; C. M. Maynard

    2001-07-01

    We discuss the extraction of negative-parity baryon masses from lattice QCD calculations. The mass of the lowest-lying negative-parity J = 1/2- state is computed in quenched lattice QCD using an O(a)-improved clover fermion action, and a splitting found with the nucleon mass. The calculation is performed on two lattice volumes, and three lattice spacings enabling a study of both finite-volume and finite-lattice-spacing uncertainties. A measurement of the first excited radial excitation of the nucleon finds a mass comparable, or even somewhat larger than that of the negative-parity ground state, in accord with other lattice determinations but in disagreement with experiment. Results are also presented for the lightest negative-parity I=3/2 state.

  19. Polyakov line actions from SU(3) lattice gauge theory with dynamical fermions via relative weights

    NASA Astrophysics Data System (ADS)

    Höllwieser, Roman; Greensite, Jeff

    2017-03-01

    We extract an effective Polyakov line action from an underlying SU(3) lattice gauge theory with dynamical fermions via the relative weights method. The centersymmetry breaking terms in the effective theory are fit to a form suggested by effective action of heavy-dense quarks, and the effective action is solved at finite chemical potential by a mean field approach. We show results for a small sample of lattice couplings, lattice actions, and lattice extensions in the time direction. We find in some instances that the long-range couplings in the effective action are very important to the phase structure, and that these couplings are responsible for long-lived metastable states in the effective theory. Only one of these states corresponds to the underlying lattice gauge theory.

  20. Gauge action improvement and smearing

    NASA Astrophysics Data System (ADS)

    Dürr, Stephan

    2005-11-01

    The effect of repeatedly smearing SU(3) gauge configurations is investigated. Six gauge actions (Wilson, Symanzik, Iwasaki, DBW2, Beinlich-Karsch-Laermann, Langfeld; combined with a direct SU(3)-overrelaxation step) and three smearings (APE, HYP, EXP) are compared. The impact on large Wilson loops is monitored, confirming the signal-to-noise prediction by Lepage. The fat-link definition of the "naive" topological charge proves most useful on improved action ensembles.

  1. The Neutral kaon mixing parameter B(K) from unquenched mixed-action lattice QCD

    SciTech Connect

    Christopher Aubin, Jack Laiho, Ruth S. Van de Water

    2010-01-01

    We calculate the neutral kaon mixing parameter B{sub K} in unquenched lattice QCD using asqtad-improved staggered sea quarks and domain-wall valence quarks. We use the '2+1' flavor gauge configurations generated by the MILC Collaboration, and simulate with multiple valence and sea quark masses at two lattice spacings of a {approx} 0.12 fm and a {approx} 0.09 fm. We match the lattice determination of B{sub K} to the continuum value using the nonperturbative method of Rome-Southampton, and extrapolate B{sub K} to the continuum and physical quark masses using mixed action chiral perturbation theory. The 'mixed-action' method enables us to control all sources of systematic uncertainty and therefore to precisely determine B{sub K}; we find a value of B{sub K}{sup {ovr MS},NDR} (2 GeV) = 0.527(6)(21), where the first error is statistical and the second is systematic.

  2. Precise Determination of the I = 2 Scattering Length from Mixed-Action Lattice QCD

    SciTech Connect

    Silas Beane; Paulo Bedaque; Thomas Luu; Konstantinos Orginos; Assumpta Parreno; Martin Savage; Aaron Torok; Andre Walker-Loud

    2008-01-01

    The I=2 pipi scattering length is calculated in fully-dynamical lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations (with fourth-rooted staggered sea quarks) at four light-quark masses. Two- and three-flavor mixed-action chiral perturbation theory at next-to-leading order is used to perform the chiral and continuum extrapolations. At the physical charged pion mass, we find m_pi a_pipi(I=2) = -0.04330 +- 0.00042, where the error bar combines the statistical and systematic uncertainties in quadrature.

  3. Discretization effects and the scalar meson correlator in mixed-action lattice simulations

    SciTech Connect

    Aubin, C.; Laiho, Jack; Van de Water, Ruth S.

    2008-06-01

    We study discretization effects in a mixed-action lattice theory with domain-wall valence quarks and Asqtad-improved staggered sea quarks. At the level of the chiral effective Lagrangian, discretization effects in the mixed-action theory give rise to two new parameters as compared to the lowest order Lagrangian for rooted-staggered fermions - the residual quark mass m{sub res} and the mixed valence-sea meson mass splitting {delta}{sub mix}. We find that m{sub res}, which parametrizes explicit chiral symmetry breaking in the mixed-action theory, is approximately one-quarter the size of our lightest valence quark mass on our coarser lattice spacing and of comparable size to that of simulations by the RBC and UKQCD Collaborations. We also find that the size of {delta}{sub mix} is comparable to the size of the smallest of the staggered meson taste splittings measured by the MILC Collaboration. Because lattice artifacts are different in the valence and sea sectors of the mixed-action theory, they give rise to unitarity-violating effects that disappear in the continuum limit, some of which should be described by mixed-action chiral perturbation theory (MA{chi}PT). Such effects are expected to be mild for many quantities of interest but are expected to be significant in the case of the isovector scalar (a{sub 0}) correlator. Specifically, once the parameters m{sub res}, {delta}{sub mix}, and two others that can be determined from the light pseudoscalar meson spectrum are known, the two-particle intermediate state 'bubble' contribution to the scalar correlator is completely predicted within MA{chi}PT. We find that the behavior of the scalar meson correlator is quantitatively consistent with the MA{chi}PT prediction; this supports the claim that MA{chi}PT describes the dominant unitarity-violating effects in the mixed-action theory and can therefore be used to remove lattice artifacts and recover physical quantities.

  4. Lattice measurement of BB_s with a chiral light quark action

    NASA Astrophysics Data System (ADS)

    Blossier, B.

    2007-12-01

    The computation on the lattice of the bag parameter BB_s associated to the B-B¯ mixing amplitude in the Standard Model is presented. The estimation has been made by combining the static limit of HQET and the Neuberger light quark action which preserves the chiral symmetry on the lattice. We find BBMS¯stat(m)=0.92(3).

  5. Nonperturbative study of the action parameters for anisotropic-lattice quarks

    SciTech Connect

    Foley, Justin; Cais, Alan O; Peardon, Mike; Ryan, Sinead M.

    2006-01-01

    A quark action designed for highly anisotropic-lattice simulations is discussed. The mass-dependence of the parameters in the action is studied and the results are presented. Applications of this action in studies of heavy quark quantities are described and results are presented from simulations at an anisotropy of six, for a range of quark masses from strange to bottom.

  6. Lasing action due to the two-dimensional quasiperiodicity of photonic quasicrystals with a Penrose lattice.

    PubMed

    Notomi, M; Suzuki, H; Tamamura, T; Edagawa, K

    2004-03-26

    We have fabricated photonic quasicrystal lasers with a Penrose lattice that does not possess translational symmetry but has long-range order, and observed coherent lasing action due to the optical feedback from quasiperiodicity, exhibiting a variety of 10-fold-symmetric lasing spot patterns. The lattice constant dependence of lasing frequencies and spot patterns show complicated features very different from photonic crystal/random lasers, and we have quantitatively explained them by considering their reciprocal lattice. Unique diversity of their reciprocal lattice opens up new possibilities for the form of lasers.

  7. ON-SHELL IMPROVEMENT OF THE MASSIVE WILSON QUARK ACTION.

    SciTech Connect

    AOKI, S.; KAYABA, Y.; KURAMASHI, Y.; YAMADA, N.

    2005-04-01

    We review a relativistic approach to the heavy quark physics in lattice QCD by applying a relativistic O(a) improvement to the massive Wilson quark action on the lattice. After explaining how power corrections of m{sub Q}a can be avoided and remaining uncertainties are reduced to be of order (a{Lambda}{sub QCD}){sup 2}, we demonstrate a determination of four improvement coefficients in the action up to one-loop level in a mass dependent way. We also show a perturbative determination of mass dependent renormalization factors and O(a) improvement coefficients for the vector and axial vector currents. Some preliminary results of numerical simulations are also presented.

  8. Decay Constants of B and D Mesons from Non-pertubatively Improved Lattice QCD

    SciTech Connect

    K.C. Bowler; L. Del Debbio; J.M. Flynn; G.N, Lacagnina; V.I. Lesk; C.M. Maynard; D.G. Richards

    2000-07-01

    The decay constants of B and D mesons are computed in quenched lattice QCD at two different values of the coupling. The action and operators are ? (a) improved with non-perturbative coefficients where available. The results and systematic errors are discussed in detail. Results for vector decay constants, flavour symmetry breaking ratios of decay constants, the pseudoscalar-vector mass splitting and D meson masses are also presented.

  9. Meson-Baryon Scattering Lengths from Mixed-Action Lattice QCD

    SciTech Connect

    Will Detmold, William Detmold, Konstantinos Orginos, Aaron Torok, Silas R Beane, Thomas C Luu, Assumpta Parreno, Martin Savage, Andre Walker-Loud

    2010-04-01

    The $\\pi^+\\Sigma^+$, $\\pi^+\\Xi^0$ , $K^+p$, $K^+n$, and $K^0 \\Xi^0$ scattering lengths are calculated in mixed-action Lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations at four light-quark masses, and at two light-quark masses on the fine MILC configurations. Heavy Baryon Chiral Perturbation Theory with two and three flavors of light quarks is used to perform the chiral extrapolations. We find no convergence for the kaon-baryon processes in the three-flavor chiral expansion. Using the two-flavor chiral expansion, we find $a_{\\pi^+\\Sigma^+} = ?0.197 ± 0.017$ fm, and $a_{\\pi^+\\Xi^0} = ?0.098 0.017$ fm, where the comprehensive error includes statistical and systematic uncertainties.

  10. Two topics in nonperturbative lattice field theories: The U(1) quantum link model and perfect actions for scalar theories

    NASA Astrophysics Data System (ADS)

    Tsapalis, Antonios S.

    This thesis deals with two topics in lattice field theories. In the first part we discuss aspects of renormalization group flow and non-perturbative improvement of actions for scalar theories regularized on a lattice. We construct a perfect action, an action which is free of lattice artifacts, for a given theory. It is shown how a good approximation to the perfect action-referred to as classically perfect-can be constructed based on a well-defined blocking scheme for the O(3) non-linear σ-model. We study the O(N) non- linear σ-model in the large-N limit and derive analytically its perfect action. This action is applied to the O(3) model on a square lattice. The Wolff cluster algorithm is used to simulate numerically the system. We perform scaling tests and discuss the scaling properties of the large- N inspired perfect action as opposed to the standard and the classically perfect action. In the second part we present a new formulation for a quantum field theory with Abelian gauge symmetry. A Hamiltonian is constructed on a four-dimensional Euclidean space-time lattice which is invariant under local transformations. The model is formulated as a 5- dimensional path integral of discrete variables. We argue that dimensional reduction will allow us to study the behavior of the standard compact U(1) gauge theory in 4-d. Based on the idea of the loop- cluster algorithm for quantum spins, we present the construction of a flux-cluster algorithm for the U(1) quantum link model for the spin-1/2 quantization of the electric flux. It is shown how improved estimators for Wilson loop expectation values can be defined. This is important because the Wilson loops are traditionally used to identify confining and Coulomb phases in gauge theories. Our study indicates that the spin-1/2 U(1) quantum link model is strongly coupled for all bare coupling values we examined. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.)

  11. Improved lattice computation of proton decay matrix elements

    NASA Astrophysics Data System (ADS)

    Aoki, Yasumichi; Izubuchi, Taku; Shintani, Eigo; Soni, Amarjit

    2017-07-01

    We present an improved result for the lattice computation of the proton decay matrix elements in Nf=2 +1 QCD. In this study, by adopting the error reduction technique of all-mode-averaging, a significant improvement of the statistical accuracy is achieved for the relevant form factor of proton (and also neutron) decay on the gauge ensemble of Nf=2 +1 domain-wall fermions with mπ=0.34 - 0.69 GeV on a 2.7 fm3 lattice, as used in our previous work [1]. We improve the total accuracy of matrix elements to 10-15% from 30-40% for p →π e+ or from 20-40% for p →K ν ¯. The accuracy of the low-energy constants α and β in the leading-order baryon chiral perturbation theory (BChPT) of proton decay are also improved. The relevant form factors of p →π estimated through the "direct" lattice calculation from the three-point function appear to be 1.4 times smaller than those from the "indirect" method using BChPT with α and β . It turns out that the utilization of our result will provide a factor 2-3 larger proton partial lifetime than that obtained using BChPT. We also discuss the use of these parameters in a dark matter model.

  12. Lattice renormalization of O(a) improved heavy-light operators

    NASA Astrophysics Data System (ADS)

    Blossier, Benoît

    2007-12-01

    The analytical expressions and the numerical values of the renormalization constants of O(a) improved static-light currents are given at one-loop order of perturbation theory in the framework of heavy quark effective theory: the static quark is described by the HYP action and the light quark is described either with the Clover or the Neuberger action. These factors are relevant to extract from a lattice computation the decay constants fB, fBS and the set of bag parameters Bi associated with B-B¯ mixing phenomenology in the standard model and beyond.

  13. An Improved Lattice Kinetic Scheme for Incompressible Viscous Fluid Flows

    NASA Astrophysics Data System (ADS)

    Suzuki, Kosuke; Inamuro, Takaji

    2014-01-01

    The lattice Boltzmann method (LBM) is an explicit numerical scheme for the incompressible Navier-Stokes equations (INSE) without integrating the Poisson equation for the pressure. In spite of its merit, the LBM has some drawbacks in accuracy. First, we review drawbacks for three numerical methods based on the LBM. The three methods are the LBM with the Bhatnagar-Gross-Krook model (LBGK), the lattice kinetic scheme (LKS) and the link-wise artificial compressibility method (LWACM). Second, in order to remedy the drawbacks, we propose an improved LKS. The present method incorporates (i) the scheme used in the LWACM for determining the kinematic viscosity, (ii) an iterative calculation of the pressure and (iii) a semi-implicit algorithm, while preserving the simplicity of the algorithm of the original LKS. Finally, in simulations of test problems, we find that the improved LKS eliminates the drawbacks and gives more accurate and stable results than LBGK, LKS and LWACM.

  14. Flavor symmetry breaking in lattice QCD with a mixed action

    SciTech Connect

    Baer, Oliver; Golterman, Maarten; Shamir, Yigal

    2011-03-01

    We study the phase structure of mixed-action QCD with two Wilson sea quarks and any number of chiral valence quarks (and ghosts), starting from the chiral Lagrangian. A priori the effective theory allows for a rich phase structure, including a phase with a condensate made of sea and valence quarks. In such a phase, mass eigenstates would become admixtures of sea and valence fields, and pure-sea correlation functions would depend on the parameters of the valence sector, in contradiction with the actual setup of mixed-action simulations. Using that the spectrum of the chiral Dirac operator has a gap for nonzero quark mass we prove that spontaneous symmetry breaking of the flavor symmetries can only occur within the sea sector. This rules out a mixed condensate and implies restrictions on the low-energy constants of the effective theory.

  15. Negative-Parity Baryon Masses Using O(a)-improved Fermion Action

    SciTech Connect

    M. Gockeler; R. Horsley; D. Pleiter; P.E.L. Rakow; G. Schierholz; C.M. Maynard; D.G. Richards

    2001-06-01

    We present a calculation of the mass of the lowest-lying negative-parity J=1/2{sup {minus}} state in quenched QCD. Results are obtained using a non-perturbatively {Omicron}(a)-improved clover fermion action, and a splitting found between the masses of the nucleon, and its parity partner. The calculation is performed on two lattice volumes, and at three lattice spacings, enabling a study of both finite-volume and finite lattice-spacing uncertainties. A comparison is made with results obtained using the unimproved Wilson fermion action.

  16. Numerical Tests of the Improved Fermilab Action

    SciTech Connect

    Detar, C.; Kronfeld, A.S.; Oktay, M.B.

    2010-11-01

    Recently, the Fermilab heavy-quark action was extended to include dimension-six and -seven operators in order to reduce the discretization errors. In this talk, we present results of the first numerical simulations with this action (the OK action), where we study the masses of the quarkonium and heavy-light systems. We calculate combinations of masses designed to test improvement and compare results obtained with the OK action to their counterparts obtained with the clover action. Our preliminary results show a clear improvement.

  17. Nonperturbative determination of improvement coefficients using coordinate space correlators in Nf=2 +1 lattice QCD

    NASA Astrophysics Data System (ADS)

    Korcyl, Piotr; Bali, Gunnar S.

    2017-01-01

    We determine quark mass dependent order a improvement terms of the form bJa m for nonsinglet scalar, pseudoscalar, vector and axialvector currents using correlators in coordinate space on a set of Coordinated Lattice Simulations ensembles. These have been generated employing nonperturbatively improved Wilson fermions and the tree-level Lüscher-Weisz gauge action at β =3.4 , 3.46, 3.55 and 3.7, corresponding to lattice spacings ranging from a ≈0.085 fm down to 0.05 fm. In the Nf=2 +1 flavor theory two types of improvement coefficients exist: bJ, proportional to nonsinglet quark mass combinations, and b¯J (or b˜J), proportional to the trace of the quark mass matrix. Combining our nonperturbative determinations with perturbative results, we quote Padé approximants parametrizing the bJ improvement coefficients within the above window of lattice spacings. We also give preliminary results for b˜J at β =3.4 .

  18. Playing Action Video Games Improves Visuomotor Control.

    PubMed

    Li, Li; Chen, Rongrong; Chen, Jing

    2016-08-01

    Can playing action video games improve visuomotor control? If so, can these games be used in training people to perform daily visuomotor-control tasks, such as driving? We found that action gamers have better lane-keeping and visuomotor-control skills than do non-action gamers. We then trained non-action gamers with action or nonaction video games. After they played a driving or first-person-shooter video game for 5 or 10 hr, their visuomotor control improved significantly. In contrast, non-action gamers showed no such improvement after they played a nonaction video game. Our model-driven analysis revealed that although different action video games have different effects on the sensorimotor system underlying visuomotor control, action gaming in general improves the responsiveness of the sensorimotor system to input error signals. The findings support a causal link between action gaming (for as little as 5 hr) and enhancement in visuomotor control, and suggest that action video games can be beneficial training tools for driving.

  19. Highly improved staggered quarks on the lattice with applications to charm physics

    SciTech Connect

    Follana, E.; Davies, C.; Wong, K.; Mason, Q.; Hornbostel, K.; Lepage, G. P.; Shigemitsu, J.; Trottier, H.

    2007-03-01

    We use perturbative Symanzik improvement to create a new staggered-quark action (HISQ) that has greatly reduced one-loop taste-exchange errors, no tree-level order a{sup 2} errors, and no tree-level order (am){sup 4} errors to leading order in the quark's velocity v/c. We demonstrate with simulations that the resulting action has taste-exchange interactions that are 3-4 times smaller than the widely used ASQTAD action. We show how to bound errors due to taste exchange by comparing ASQTAD and HISQ simulations, and demonstrate with simulations that such errors are likely no more than 1% when HISQ is used for light quarks at lattice spacings of 1/10 fm or less. The suppression of (am){sup 4} errors also makes HISQ the most accurate discretization currently available for simulating c quarks. We demonstrate this in a new analysis of the {psi}-{eta}{sub c} mass splitting using the HISQ action on lattices where am{sub c}=0.43 and 0.66, with full-QCD gluon configurations (from MILC). We obtain a result of 111(5) MeV which compares well with the experiment. We discuss applications of this formalism to D physics and present our first high-precision results for D{sub s} mesons.

  20. Lattice calculation of nucleon isovector axial charge with improved currents

    NASA Astrophysics Data System (ADS)

    Liang, Jian; Yang, Yi-Bo; Liu, Keh-Fei; Alexandru, Andrei; Draper, Terrence; Sufian, Raza Sabbir; χ QCD Collaboration

    2017-08-01

    We employ dimension-4 operators to improve the local vector and axial-vector currents and calculate the nucleon isovector axial coupling gA3 with overlap valence on 2 +1 -flavor domain wall fermion (DWF) sea. Using the equality of gA3 from the spatial and temporal components of the axial-vector current as a normalization condition, we find that gA3 is increased by a few percent towards the experimental value. The excited-state contamination has been taken into account with three time separations between the source and sink. The improved axial charges gA3(24 I )=1.22 (4 )(3 ) and gA3(32 I )=1.21 (3 )(3 ) are obtained on a 2 43×64 lattice at pion mass of 330 MeV and a 3 23×64 lattice at pion mass 300 MeV and are increased by 3.4% and 1.7% from their unimproved values, respectively. We have also used clover fermions on the same DWF configurations and find the same behavior for the local axial charge as that with overlap fermions.

  1. Meson-Baryon Scattering Lengths from Mixed-Action Lattice QCD

    SciTech Connect

    Beane, S; Detmold, W; Luu, T; Orginos, K; Parreno, A; Torok, A; Walker-Loud, A

    2009-06-30

    The {pi}{sup +}{Sigma}{sup +}, {pi}{sup +}{Xi}{sup 0}, K{sup +}p, K{sup +}n, {bar K}{sup 0}{Sigma}{sup +}, and {bar K}{sup 0}{Xi}{sup 0} scattering lengths are calculated in mixed-action Lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations at four light-quark masses, and at two light-quark masses on the fine MILC configurations. Heavy Baryon Chiral Perturbation Theory with two and three flavors of light quarks is used to perform the chiral extrapolations. We find no convergence for the kaon-baryon processes in the three-flavor chiral expansion. Using the two-flavor chiral expansion, we find a{sub {pi}{sup +}{Sigma}{sup +}} = -0.197 {+-} 0.017 fm, and a{sub {pi}{sup +}{Xi}{sup 0}} = -0.098 {+-} 0.017 fm, where the comprehensive error includes statistical and systematic uncertainties.

  2. Stability improvements for the NIST Yb optical lattice clock

    NASA Astrophysics Data System (ADS)

    Fasano, R. J.; Schioppo, M.; McGrew, W. F.; Brown, R. C.; Hinkley, N.; Yoon, T. H.; Beloy, K.; Oates, C. W.; Ludlow, A. D.

    2016-05-01

    To reach the fundamental limit given by quantum projection noise, optical lattice clocks require advanced laser stabilization techniques. The NIST ytterbium clock has benefited from several generations of extremely high finesse optical cavities, with cavity linewidths below 1 kHz. Characterization of the cavity drift rate has allowed compensation to the mHz/s level, improving the medium-term stability of the cavity. Based on recent measurements using Ramsey spectroscopy with synchronous interrogation, we report a fractional instability σy(1s) <=10-16 , dominated by atom number fluctuation noise. We also provide updates on our cryogenic sapphire cavity with a reduced thermal noise floor, which will improve our Dick-limited fractional instability at 1 s to below 10-16. Also at University of Colorado.

  3. Improved and perfect actions in discrete gravity

    SciTech Connect

    Bahr, Benjamin; Dittrich, Bianca

    2009-12-15

    We consider the notion of improved and perfect actions within Regge calculus. These actions are constructed in such a way that they - although being defined on a triangulation - reproduce the continuum dynamics exactly, and therefore capture the gauge symmetries of general relativity. We construct the perfect action in three dimensions with a cosmological constant, and in four dimensions for one simplex. We conclude with a discussion about Regge calculus with curved simplices, which arises naturally in this context.

  4. Structure of critical lines in quenched lattice QCD with the Wilson quark action

    SciTech Connect

    Aoki, S.; Kaneda, T.; Ukawa, A.

    1997-08-01

    The structure of critical lines of a vanishing pion mass for the Wilson quark action is examined in quenched lattice QCD. Numerical evidence is presented that the critical lines spread into five branches beyond {beta}=5.6{endash}5.7 at zero temperature. It is also shown that the critical lines disappear in the deconfined phase for the case of finite temperatures. {copyright} {ital 1997} {ital The American Physical Society}

  5. Numerical study of tree-level improved lattice gradient flows in pure Yang-Mills theory

    NASA Astrophysics Data System (ADS)

    Kamata, Norihiko; Sasaki, Shoichi

    2017-03-01

    We study several types of tree-level improvement in the Yang-Mills gradient flow method in order to reduce the lattice discretization errors in line with Fodor et al. [J. High Energy Phys. 09 (2014) 018., 10.1007/JHEP09(2014)018]. The tree-level O (a2) improvement can be achieved in a simple manner, where an appropriate weighted average is computed between the plaquette and clover-leaf definitions of the action density ⟨E (t )⟩ measured at every flow time t . We further develop the idea of achieving the tree-level O (a4) improvement within a usage of actions consisting of the 1 ×1 plaquette and 1 ×2 planar loop for both the flow and gauge actions. For testing our proposal, we present numerical results for ⟨E (t )⟩ obtained on gauge configurations generated with the Wilson and Iwasaki gauge actions at three lattice spacings (a ≈0.1 ,0.07 , and 0.05 fm). Our results show that tree-level improved flows significantly eliminate the discretization corrections on t2⟨E (t )⟩ in the relatively small-t regime for up to t ≳a2 . To demonstrate the feasibility of our tree-level improvement proposal, we also study the scaling behavior of the dimensionless combinations of the ΛMS ¯ parameter and the new reference scale tX, which is defined through tX2⟨E (tX)⟩=X for the smaller X , e.g., X =0.15 . It is found that √{t0.15 }ΛMS ¯ shows a nearly perfect scaling behavior as a function of a2 regardless of the types of gauge action and flow, after tree-level improvement is achieved up to O (a4) . Further detailed study of the scaling behavior exposes the presence of the remnant O (g2 na2) corrections, which are beyond the tree level. Although our proposal is not enough to eliminate all O (a2) effects, we show that the O (g2 na2) corrections can be well under control even by the simplest tree-level O (a2) improved flow.

  6. Finite-temperature phase structure of lattice QCD with Wilson quark action

    SciTech Connect

    Aoki, S.; Ukawa, A.; Umemura, T.

    1996-02-01

    The long-standing issue of the nature of the critical line of lattice QCD with the Wilson quark action at finite temperatures, defined to be the line of vanishing pion screening mass, and its relation to the line of finite-temperature chiral transition is examined. Presented are both analytical and numerical evidence that the critical line forms a cusp at a finite gauge coupling, and that the line of chiral transition runs past the tip of the cusp without touching the critical line. Implications on the continuum limit and the flavor dependence of chiral transition are discussed. {copyright} {ital 1996 The American Physical Society.}

  7. Action Research: Improving Graduate-Level Writing

    ERIC Educational Resources Information Center

    Carter, Nari

    2012-01-01

    I am a doctoral student enrolled in an educational research program. While completing an action research course, I conducted research to improve my academic writing and to develop skills for formulating arguments about educational issues. From this research I developed an appreciation for and an understanding of good writing habits and elements of…

  8. I=2 pi-pi Scattering from Fully-Dynamical Mixed-Action Lattice QCD

    SciTech Connect

    Silas R. Beane; Paulo F. Bedaque; Kostas Orginos; Martin J. Savage

    2005-06-11

    We compute the I=2 {pi}{pi} scattering length at pion masses of m{sub {pi}} = 294, 348 and 484 MeV in fully-dynamical lattice QCD using Luescher's finite-volume method. The calculation is performed with domain-wall valence-quark propagators on asqtad-improved MILC configurations with staggered sea quarks. Chiral perturbation theory is used to perform the extrapolation of the scattering length from lattice quark masses down to the physical value, and we find m{sub {pi}}a{sub 2} = -0.0426 {+-} 0.0006 {+-} 0.0003 {+-} 0.0018, in good agreement with experiment. The I = 2 {pi}{pi} scattering phase shift is calculated to be {delta} = -43 {+-} 10 {+-} 5 degrees at |p| {approx} 544 MeV for m{pi} {approx} 484 MeV.

  9. Charm spectroscopy on dynamical 2+1 flavor domain wall fermion lattices with a relativistic heavy quark action

    SciTech Connect

    Min Li; Huey-Wen Lin

    2007-10-01

    We present a preliminary calculation of the charmonium spectrum using the dynamical 2+1 flavor $24^3\\times 64$ domain wall fermion lattice configurations generated by the RBC and UKQCD collaborations. We use the relativistic heavy quark action with 3 parameters non-perturbatively determined by matching to experimental quantities. Chiral extrapolation is done on four light sea quark masses from 0.005 to 0.03, with $m_s=0.04$ and $m_{res}=0.003$. We can either predict meson masses assuming the lattice spacing is known from other methods, or calculate the lattice spacing using those quantities.

  10. Framework for improved lattice calculations of epsilion'/epsilon

    NASA Astrophysics Data System (ADS)

    Laiho, Jack

    In this thesis we show that it is possible to construct epsilon '/epsilon to NLO using both full and partially quenched chiral perturbation theory (PQChPT) from amplitudes that are computable using numerical lattice gauge theory. We find that the electro-weak penguin (Delta I = 3/2 and 1/2) contributions to epsilon'/epsilon in PQChPT can be determined to NLO using only degenerate (mK = mpi) K → pi computations without momentum insertion. All one-loop formulas needed to extract the necessary NLO constants from the lattice are presented in this work. Issues pertaining to power divergent contributions, originating from mixing with lower dimensional operators in a lattice regularization, are addressed. In embedding the QCD penguin left-right operator onto PQChPT an ambiguity arises when the number of light sea quarks is not the physical value of three, as first emphasized by Golterman and Pallante. In the quenched theory they have pointed out that there are additional effective operators that appear in the quenched chiral perturbation theory needed to make contact with K → pipi amplitudes at physical kinematics. They have also proposed a method for determining the leading order low-energy constant, aNSq , associated with the new operators. We show that their method has difficulties due to power divergent contributions and propose a new method to obtain this constant from the lattice which does not suffer from this problem. Using this alternative method, we obtain aNSq , and show that our value implies a large ambiguity in the quenched contribution of Q6 to epsilon'/epsilon.

  11. Nonperturbative O(a) improvement of Wilson quark action in three-flavor QCD with plaquette gauge action

    SciTech Connect

    Yamada, N.; Hashimoto, S.; Kaneko, T.; Tsutsui, N.; Aoki, S.; Taniguchi, Y.; Fukugita, M.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Iwasaki, Y.; Kanaya, K.; Kuramashi, Y.; Ukawa, A.; Yoshie, T.

    2005-03-01

    We perform a nonperturbative determination of the O(a)-improvement coefficient c{sub SW} for the Wilson quark action in three-flavor QCD with the plaquette gauge action. Numerical simulations are carried out in a range of {beta}=12.0-5.2 on a single lattice size of 8{sup 3}x16 employing the Schroedinger functional setup of lattice QCD. As our main result, we obtain an interpolation formula for c{sub SW} and the critical hopping parameter K{sub c} as a function of the bare coupling. This enables us to remove the O(a) scaling violation from physical observables in future numerical simulation in the wide range of {beta}. Our analysis with a perturbatively modified improvement condition for c{sub SW} suggests that finite volume effects in c{sub SW} are not large on the 8{sup 3}x16 lattice. We investigate N{sub f} dependence of c{sub SW} by additional simulations for N{sub f}=4, 2, and 0 at {beta}=9.6. As a preparatory step for this study, we also determine c{sub SW} in two-flavor QCD at {beta}=5.2. At this {beta}, several groups have carried out large-scale calculations of the hadron spectrum, while no systematic determination of c{sub SW} has been performed.

  12. Improvement of lattice site location of Ga implanted into Al after pulsed electron beam annealing

    NASA Astrophysics Data System (ADS)

    Hussain, T.; Geerk, J.; Ratzel, F.; Linker, G.

    1980-08-01

    The effect of pulsed electron beam annealing (PEBA) on the lattice location and impurity distribution of Ga ions implanted into Al single crystals has been compared with the thermal annealing behavior of this ion/target system. While with thermal annealing only slight improvement of the lattice site occupation was observed after PEBA within experimental accuracy, all implanted impurities occupied perfect lattice sites. In the thermal treatment the Ga atoms partially diffused out of the implanted region; with PEBA, however, the implanted impurity distribution remained unchanged.

  13. An improved method for extracting matrix elements from lattice three-point functions

    SciTech Connect

    C. Aubin, K. Orginos

    2011-12-01

    The extraction of matrix elements from baryon three-point functions is complicated by the fact that the signal-to-noise drops rapidly as a function of time. Using a previously discussed method to improve the signal-to-noise for lattice two-point functions, we use this technique to do so for lattice three-point functions, using electromagnetic form factors for the nucleon and Delta as an example.

  14. The Gell-Mann - Okubo Mass Relation among Baryons from Fully-Dynamical, Mixed-Action Lattice QCD

    SciTech Connect

    Konstantinos Orginos; Silas Beane; Martin Savage

    2007-10-01

    We explore the Gell-Mann - Okubo mass relation among the octet baryons using fully-dynamical, mixed-action (domain-wall on rooted-staggered) lattice QCD calculations at a lattice spacing of b {approx} 0.125 fm and pion masses of m{sub pi} {approx} 290 MeV, 350 MeV, 490 MeV and 590 MeV. Deviations from the Gell-Mann - Okubo mass relation are found to be small at each quark mass.

  15. Improving Contract Performance by Corrective Actions Plans

    SciTech Connect

    Dowd, A.S., jr.

    2002-06-23

    Corrective Action Plans (CAPs) are required to be developed, submitted, and reported upon by the prime contractors for the U.S. Department of Energy (U.S. DOE) Management and Operations (M and O) contracts. The best known CAP ''type,'' and there are many, is for Price-Anderson Amendments Act (PAAA) ''potential noncompliances.'' The M and O contractor fines for PAAA problems have increased from approximately $100,000 in 1996 to almost $2,000,000 in 2000. In order to improve CAP performance at the National Nuclear Security Administration (NNSA) site at Y-12 in Oak Ridge, Tennessee, the contractor chose to centralize the company-wide processes of problem identification and reporting with the PAAA (and other) CAP processes. This directly integrates these functional reports to the contractor General Manager. The functions contained in the M and O contractor central organization, called ''Performance Assurance,'' are: PAAA; Defense Nuclear Facilities Safety Board (DNFSB) Liaison; Contract Requirements Management; Issues Management (including the CAP processes); Lessons Learned; Independent and Management Assessments; Internal Audits; and Ethics. By centrally locating and managing these problem identification and problem correction functions, the contractor, BWXT Y-12, L.L.C., has improved PAAA (and other) CAP performance more than 200 percent in the first year of the contract. Much of this improvement (see Table 1 for examples) has been achieved by increasing the knowledge and experience of management and workers in the specific contract and company requirements for CAPs. The remainder of this paper will describe some of the many CAP processes at Y-12 to show the reader the non-trivial scope of the CAP process. Improvements in CAP management will be discussed. In addition, a specific recommendation for CAP management, in a major capital construction project, will be presented.

  16. Nonperturbative renormalization of meson decay constants in quenched QCD for a renormalization group improved gauge action

    SciTech Connect

    Ide, K.; Aoki, S.; Kanaya, K.; Taniguchi, Y.; Burkhalter, R.; Ishikawa, K.-I.; Ishizuka, N.; Iwasaki, Y.; Ukawa, A.; Yoshie, T.; Fukugita, M.; Hashimoto, S.; Kaneko, T.; Kuramashi, Y.; Ishikawa, T.; Lesk, V.; Umeda, T.; Okawa, M.

    2004-10-01

    Renormalization constants (Z-factors ) of vector and axial-vector currents are determined nonperturbatively in quenched QCD for a renormalization group improved gauge action and a tadpole-improved clover quark action using the Schroedinger functional method. Nonperturbative values of Z-factors turn out to be smaller than 1-loop perturbative values by O(15%) at a lattice spacing of a{sup -1}{approx_equal} 1 GeV. The pseudoscalar and vector meson decay constants calculated with the nonperturbative Z-factors show a much better scaling behavior compared to previous results obtained with tadpole-improved one-loop Z-factors. In particular, the nonperturbative Z-factors normalized at infinite physical volume show that the scaling violations of the decay constants are within about 10% up to the lattice spacing a{sup -1}{approx}1 GeV. The continuum estimates obtained from data in the range a{sup -1}{approx} 1-2 GeV agree with those determined from finer lattices (a{sup -1}{approx}2-4 GeV) with the standard action.

  17. Improved information analysis - views and actions

    SciTech Connect

    Sheely, K.B.; Manatt, D.R.

    1995-07-01

    The IAEA continues to assess, develop, and test recommendations for strengthening the cost effectiveness of safeguards. The IAEA`s investigation has focused on ways to increase Agency access to data, including access to sites and site data, export/import data, environmental data, open-source data, and other expanded data sources. Although the acquisition of this raw data is essential to strengthening safeguards, the effectiveness of the system is going to be judged by what the Agency does with the data once they have acquired it. Therefore, the IAEA must have the capability to organize, analyze and present the data in a timely manner for internal management evaluation and external dissemination. The United States Department of Energy has established a Safeguards Information Management Systems (SIMS) Initiative to provide support and equipment which will improve the IAEA`s capability to utilize this expanded data to analyze State`s nuclear activities. This paper will present views on steps to improve information analysis and discuss the status of actions undertaken by the SIMS initiative.

  18. Optical lattice clocks near the QPN limit: a tenfold improvement in optical clock stability

    NASA Astrophysics Data System (ADS)

    Nicholson, Travis

    2013-05-01

    Two classes of optical atomic clocks have surpassed microwave frequency standards: single-ion clocks and optical lattice clocks. Single-ion clocks hold the record for the lowest systematic uncertainty; however, many-atom lattice clocks have the potential to outperform single-ion clocks because the standard quantum limit to atomic clock instability (known as quantum projection noise or QPN) scales as 1 /√{Natoms}. For realistic atom numbers and coherence times, QPN-limited lattice clocks could average down to a given stability hundreds of times faster than the best ion clocks. Up to now lattice clocks with 1000 atoms have not shown improvement over the stability of single-ion clocks. Lattice clock stability has been limited by laser noise (via the optical Dick effect). To address this problem, we constructed a new clock laser with a thermal noise floor of 1 ×10-16 -an order of magnitude improvement over our previous clock laser. With this laser, we compare two lattice clocks, reaching instability of 1 ×10-17 in 2000 s for a single clock. This instability is within a factor of 2 of the theoretical QPN limit for 1000 atoms, representing the lowest reported instability for an independent clock. The high stability of many-particle clocks can come at the price of larger systematic uncertainty due to a frequency shift from atomic interactions. To minimize this shift, we use a cavity-enhanced lattice for our second clock. The high circulating power inside the cavity allows for a large trap volume, yielding a density at 2000 atoms that is 27 times smaller (than in our first clock) and permitting us to trap as many as 5 ×104 atoms. For 2000 atoms in our lattice, we measure a value for this shift (which is linear in density) of - 3 . 11 ×10-17 with an uncertainty of 8 . 2 ×10-19.

  19. Chiral transition and deconfinement transition in QCD with the highly improved staggered quark (HISQ) action

    SciTech Connect

    Petreczky P.; Bazavov, A.

    2011-10-11

    We report preliminary results on the chiral and deconfinement aspects of the QCD transition at finite temperature using the Highly Improved Staggered Quark (HISQ) action on lattices with temporal extent of N{sub {tau}} = 6 and 8. The chiral aspects of the transition are studied in terms of quark condensates and the disconnected chiral susceptibility. We study the deconfinement transition in terms of the strange quark number susceptibility and the renormalized Polyakov loop. We made continuum estimates for some quantities and find reasonably good agreement between our results and the recent continuum extrapolated results obtained with the stout staggered quark action.

  20. Nonperturbative O(a) improvement of the Wilson quark action with the renormalization-group-improved gauge action using the Schroedinger functional method

    SciTech Connect

    Aoki, S.; Takeda, S.; Taniguchi, Y.; Fukugita, M.; Hashimoto, S.; Kaneko, T.; Yamada, N.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Iwasaki, Y.; Kanaya, K.; Kuramashi, Y.; Ukawa, A.; Yoshie, T.; Tsutsui, N.

    2006-02-01

    We perform a nonperturbative determination of the O(a)-improvement coefficient c{sub SW} and the critical hopping parameter {kappa}{sub c} for N{sub f}=3, 2, and 0 flavor QCD with the (RG) renormalization-group-improved gauge action using the Schroedinger functional method. In order to interpolate c{sub SW} and {kappa}{sub c} as a function of the bare coupling, a wide range of {beta} from the weak coupling region to the moderately strong coupling points used in large-scale simulations is studied. Corrections at finite lattice size of O(a/L) turned out to be large for the RG-improved gauge action, and hence we make the determination at a size fixed in physical units using a modified improvement condition. This enables us to avoid O(a) scaling violations which would remain in physical observables if c{sub SW} determined for a fixed lattice size L/a is used in numerical simulations.

  1. Finite-temperature behavior of lattice QCD with Wilson fermion action and its implication on spectroscopic studies

    SciTech Connect

    Fukugita, M.; Ohta, S.; Ukawa, A.

    1986-10-20

    Finite-temperature behavior of lattice QCD is studied with the Wilson fermion action and use of the Langevin technique for treating quarks dynamically. It is found that the transition zone from low- to high-temperature behavior does not cross the line of critical hopping parameter, but rather continues down to the strong-coupling limit. Practical implications for spectroscopic simulations at small quark masses are discussed.

  2. Locations of Roberge-Weiss transition endpoints in lattice QCD with Nf=2 improved Kogut-Susskind quarks

    NASA Astrophysics Data System (ADS)

    Wu, Liang-Kai; Meng, Xiang-Fei

    2017-03-01

    Result on locations of the tricritical points of Nf=2 lattice QCD with imaginary chemical potential is presented. Simulations are carried out with Symanzik improved gauge action and Asqtad fermion action. With imaginary chemical potential i μI=i π T , previous studies show that the Roberge-Weiss (RW) transition endpoints are triple points at both large and small quark masses, and second order transition points at intermediate quark masses. The triple and second order endpoints are separated by two tricritical ones. Our simulations are carried out at 7 values of quark mass a m ranging from 0.024 to 0.070 on lattice volume 1 23×4 , 1 63×4 , 2 03×4 . The susceptibility and Binder cumulant of the imaginary part of the Polyakov loop are employed to determine the nature of RW transition endpoints. The simulations suggest that the two tricritical points are within the range 0.024-0.026 and 0.040-0.050, respectively.

  3. Tutorial Action as a Resource to Improve Higher Education

    ERIC Educational Resources Information Center

    Lorenzo, Carmen Ricoy; Pino Juste, Margarita

    2008-01-01

    This article describes a qualitative study, and it focuses on the analysis of the dynamics surrounding tutorial action in higher education. The authors have tried to determine the specific needs of the students by identifying and examining the functions associated with tutorial action. Several action guidelines aimed at improving tutorial function…

  4. Tutorial Action as a Resource to Improve Higher Education

    ERIC Educational Resources Information Center

    Lorenzo, Carmen Ricoy; Pino Juste, Margarita

    2008-01-01

    This article describes a qualitative study, and it focuses on the analysis of the dynamics surrounding tutorial action in higher education. The authors have tried to determine the specific needs of the students by identifying and examining the functions associated with tutorial action. Several action guidelines aimed at improving tutorial function…

  5. Bottom-Hadron Mass Splittings from Static-Quark Action on 2+1-Flavor Lattices

    SciTech Connect

    Huey-Wen Lin, Saul D. Cohen, Nilmani Mathur, Kostas Orginos

    2009-09-01

    We calculate bottom-baryon mass splittings using full QCD with 2+1 flavors of dynamical Kogut-Susskind sea quarks and domain-wall valence quarks along with a static heavy quark on a lattice of spatial volume of $(\\sim 2.5\\mbox{ fm})^3$ with lattice spacing of about 0.124~fm over a range of pion masses as low as 291~MeV. We calculate the mass splittings of bottom hadrons with respect to $B_d$ and $\\Lambda_b$. Our results are in agreement with experimental observations and other lattice calculations, within our statistical and systematic errors. In particular, we find the mass of the $\\Omega_b$ to be consistent with the recent CDF measurement. We also predict the mass for the as yet unobserved $\\Xi^\\prime_b$ to be 5955(27)~MeV.

  6. Designing and Implementing Collaborative Improvement in the Extended Manufacturing Enterprise: Action Learning and Action Research (ALAR) in CO-IMPROVE

    ERIC Educational Resources Information Center

    Coghlan, David; Coughlan, Paul

    2006-01-01

    Purpose: The purpose of this article is to provide a design and implementation framework for ALAR (action learning action research) programme which aims to address collaborative improvement in the extended manufacturing enterprise. Design/methodology/approach: This article demonstrates the design of a programme in which action learning and action…

  7. High-loop perturbative renormalization constants for Lattice QCD (III): three-loop quark currents for Iwasaki gauge action and Wilson fermions

    NASA Astrophysics Data System (ADS)

    Brambilla, M.; Di Renzo, F.; Hasegawa, M.

    2014-07-01

    This is the third of a series of papers on three-loop computation of renormalization constants for Lattice QCD. Our main points of interest are results for the regularization defined by the Iwasaki gauge action and Wilson fermions. Our results for quark bilinears renormalized according to the RI'-MOM scheme can be compared to non-perturbative results. The latter are available for twisted mass QCD: being defined in the chiral limit, the renormalization constants must be the same. We also address more general problems. In particular, we discuss a few methodological issues connected to summing the perturbative series such as the effectiveness of boosted perturbation theory and the disentanglement of irrelevant and finite-volume contributions. Discussing these issues we consider not only the new results of this paper, but also those for the regularization defined by the tree-level Symanzik improved gauge action and Wilson fermions, which we presented in a recent paper of ours. We finally comment on the extent to which the techniques we put at work in the NSPT context can provide a fresher look into the lattice version of the RI'-MOM scheme.

  8. 24 Command Fire Improvement Action Program Plan

    SciTech Connect

    GRIFFIN, G.B.

    2000-12-01

    Fluor Hanford (FH) is responsible for providing support to the Department of Energy Richland Operations Office (RL) in the implementation of the Hanford Emergency Preparedness (EP) program. During fiscal year 2000, a number of program improvements were identified from various sources including a major range fire (24 Command Fire). Evaluations of the emergency preparedness program have confirmed that it currently meets all requirements and that performance of personnel involved is good, however the desire to effect continuous improvement resulted in the development of this improvement program plan. This program plan defines the activities that will be performed in order to achieve the desired performance improvements.

  9. Actions for productivity improvement in crew training

    NASA Technical Reports Server (NTRS)

    Miller, G. E.

    1985-01-01

    Improvement of the productivity of astronaut crew instructors in the Space Shuttle program and beyond is proposed. It is suggested that instructor certification plans should be established to shorten the time required for trainers to develop their skills and improve their ability to convey those skills. Members of the training cadre should be thoroughly cross trained in their task. This provides better understanding of the overall task and greater flexibility in instructor utilization. Improved facility access will give instructors the benefit of practical application experience. Former crews should be integrated into the training of upcoming crews to bridge some of the gap between simulated conditions and the real world. The information contained in lengthy and complex training manuals can be presented more clearly and efficiently as computer lessons. The illustration, animation and interactive capabilities of the computer combine an effective means of explanation.

  10. Improving Student Engagement: Ten Proposals for Action

    ERIC Educational Resources Information Center

    Zepke, Nick; Leach, Linda

    2010-01-01

    Since the 1980s an extensive research literature has investigated how to improve student success in higher education focusing on student outcomes such as retention, completion and employability. A parallel research programme has focused on how students engage with their studies and what they, institutions and educators can do to enhance their…

  11. Improving Intelligibility: Guided Reflective Journals in Action

    ERIC Educational Resources Information Center

    Lear, Emmaline L.

    2014-01-01

    This study explores the effectiveness of guided reflective journals to improve intelligibility in a Japanese higher educational context. Based on qualitative and quantitative methods, the paper evaluates changes in speech over the duration of one semester. In particular, this study focuses on changes in prosodic features such as stress, intonation…

  12. Improving Intelligibility: Guided Reflective Journals in Action

    ERIC Educational Resources Information Center

    Lear, Emmaline L.

    2014-01-01

    This study explores the effectiveness of guided reflective journals to improve intelligibility in a Japanese higher educational context. Based on qualitative and quantitative methods, the paper evaluates changes in speech over the duration of one semester. In particular, this study focuses on changes in prosodic features such as stress, intonation…

  13. Action Research: Improving Schools and Empowering Educators. Third Edition

    ERIC Educational Resources Information Center

    Mertler, Craig A.

    2011-01-01

    Written for pre- and in-service educators, this "Third Edition" of Craig A. Mertler's "Action Research: Improving Schools and Empowering Educators" introduces the process of conducting one's own classroom- or school-based action research in conjunction with everyday instructional practices and activities. The text provides educators with the…

  14. Improving Teacher Education through Action Research. Routledge Research in Education

    ERIC Educational Resources Information Center

    Hui, Ming-Fai, Ed.; Grossman, David L., Ed.

    2011-01-01

    There has been a dearth of studies on teacher educators using action research to improve their own practice. This book is the first systematic study of a group of teachers examining and enhancing their own practice through the inquiry process of action research. This book presents a broad overview of a variety of methodologies that can be used to…

  15. Improving Teacher Education through Action Research. Routledge Research in Education

    ERIC Educational Resources Information Center

    Hui, Ming-Fai, Ed.; Grossman, David L., Ed.

    2011-01-01

    There has been a dearth of studies on teacher educators using action research to improve their own practice. This book is the first systematic study of a group of teachers examining and enhancing their own practice through the inquiry process of action research. This book presents a broad overview of a variety of methodologies that can be used to…

  16. An improved lattice Boltzmann method for simulating advective-diffusive processes in fluids

    NASA Astrophysics Data System (ADS)

    Aursjø, Olav; Jettestuen, Espen; Vinningland, Jan Ludvig; Hiorth, Aksel

    2017-03-01

    Lattice Boltzmann methods are widely used to simulate advective-diffusive processes in fluids. Lattice Bhatnagar-Gross-Krook methods presented in the literature mostly just exhibit first order spatial accuracy and introduce errors proportional to the velocity squared. Formulations proposed to alleviate this have only been partly successful and are valid only in certain specific situations. We present and demonstrate here a formulation that produces no such second order errors. This formulation suggests that a subtle, but important, adjustment is all it takes to improve the accuracy of the method. The key to the improved accuracy of this new model is the non-standard definition of the concentration that relates to the distribution function describing the advection-diffusion in lattice Boltzmann. The main advantage of the algorithm comes to view when simulating situations where fluid density variations appear. The present formulation of the advection-diffusion algorithm will, by taking into account these fluid density variations, drastically reduce the errors produced compared to the standard formulations. We also show how a source term is included in this new formulation without it losing its second order spatial accuracy.

  17. How Teachers Improve Their Practices through Action Research: The Case of the Logo Action Research Collaborative.

    ERIC Educational Resources Information Center

    Watt, Daniel Lynn; Watt, Molly Lynn

    The Logo Action Research Collaborative is creating a professional development program in the Newton (Massachusetts) schools which is based on action research and designed to support teachers and improve the use of Logo computer-assisted instruction in their classrooms. During the 1 year workshop, teachers work collaboratively on Logo programming…

  18. Lattice gauge theory for QCD

    SciTech Connect

    DeGrand, T.

    1997-06-01

    These lectures provide an introduction to lattice methods for nonperturbative studies of Quantum Chromodynamics. Lecture 1: Basic techniques for QCD and results for hadron spectroscopy using the simplest discretizations; lecture 2: Improved actions--what they are and how well they work; lecture 3: SLAC physics from the lattice-structure functions, the mass of the glueball, heavy quarks and {alpha}{sub s} (M{sub z}), and B-{anti B} mixing. 67 refs., 36 figs.

  19. Development of improved methods for the LWR lattice physics code EPRI-CELL

    SciTech Connect

    Williams, M.L.; Wright, R.Q.; Barhen, J.

    1982-07-01

    A number of improvements have been made by ORNL to the lattice physics code EPRI-CELL (E-C) which is widely used by utilities for analysis of power reactors. The code modifications were made mainly in the thermal and epithermal routines and resulted in improved reactor physics approximations and more efficient running times. The improvements in the thermal flux calculation included implementation of a group-dependent rebalance procedure to accelerate the iterative process and a more rigorous calculation of interval-to-interval collision probabilities. The epithermal resonance shielding methods used in the code have been extensively studied to determine its major approximations and to examine the sensitivity of computed results to these approximations. The study has resulted in several improvements in the original methodology.

  20. Continuous Improvement in Action: Educators' Evidence Use for School Improvement

    ERIC Educational Resources Information Center

    Cannata, Marisa; Redding, Christopher; Rubin, Mollie

    2016-01-01

    The focus of the article is the process educators use to interpret data to turn it into usable knowledge (Honig & Coburn, 2008) while engaging in a continuous improvement process. The authors examine the types of evidence educators draw upon, its perceived relevance, and the social context in which the evidence is examined. Evidence includes…

  1. Improved resource use decisions and actions through remote sensing

    NASA Technical Reports Server (NTRS)

    Hill-Rowley, R.; Boylan, M.; Enslin, W.; Vlasin, R. D.

    1975-01-01

    Operational uses of remote sensing for improving management decisions and actions concerning resource uses are considered in terms of first generation, or direct-action; and second generation or indirect, delayed-action applications. From among applications completed during 1974-75, seven case studies are offered in illustration of the many contrasts which can be drawn between first and second generation application studies. These include: (1) multi-agency river basin planning; (2) corridor assessment and route location for highway location together with improvement of county-level planning decisions; (3) improving timber management practices; (4) enforcement of new state statutes; (5) county-wide open space preservation; (6) land value reappraisal relative to property tax equalization; and (7) optimizing agri-business processing plant locations.

  2. Dual-action gas thrust bearing for improving load capacity

    NASA Technical Reports Server (NTRS)

    Etsion, I.

    1976-01-01

    The principle of utilizing hydrodynamic effects in diverging films to improve the load carrying capacity in gas thrust bearings is discussed. A new concept of a dual action bearing based on that principle is described and analyzed. The potential of the new bearing is demonstrated both analytically for an infinitely long slider and by numerical solution for a flat sector shaped thrust bearing. It is shown that the dual action bearing can extend substantially the range of load carrying capacity in gas lubricated thrust bearings and can improve their efficiency.

  3. Improving multi-tasking ability through action videogames.

    PubMed

    Chiappe, Dan; Conger, Mark; Liao, Janet; Caldwell, J Lynn; Vu, Kim-Phuong L

    2013-03-01

    The present study examined whether action videogames can improve multi-tasking in high workload environments. Two groups with no action videogame experience were pre-tested using the Multi-Attribute Task Battery (MATB). It consists of two primary tasks; tracking and fuel management, and two secondary tasks; systems monitoring and communication. One group served as a control group, while a second played action videogames a minimum of 5 h a week for 10 weeks. Both groups returned for a post-assessment on the MATB. We found the videogame treatment enhanced performance on secondary tasks, without interfering with the primary tasks. Our results demonstrate action videogames can increase people's ability to take on additional tasks by increasing attentional capacity.

  4. Simulation of liquid-vapour phase transitions and multiphase flows by an improved lattice Boltzmann model

    NASA Astrophysics Data System (ADS)

    Yang, Chen; He, Hangxing

    2015-10-01

    An improved lattice Boltzmann (LB) model with a new scheme for the interparticle interaction force term is proposed in this paper. Based on the improved LB model, the equation-free method is implemented for simulating liquid-vapour phase change and multiphase flows. The details of phase separation are presented by numerical simulation results in terms of coexistence curves and spurious currents. Compared with existing models, the proposed model can give more accurate results in a wider temperature range with the spurious currents reduced and less time consumed. Characteristics of phase separation can be quickly and accurately reflected by the proposed method. Then, the contact angle of the solid surface is numerically investigated based on the proposed model. The proposed model is valid for steady flow with near zero velocity; unsteady cases will be investigated in further studies. This work will be helpful for our long-term aim of multi-scale modelling of convective boiling.

  5. Improved lattice Boltzmann model for multi-component diffusion flow with large pressure difference

    NASA Astrophysics Data System (ADS)

    Liu, Fu-Min; Wang, An-Lin; Qiu, Ruo-Fan; Jiang, Tao

    2016-05-01

    The pseudopotential lattice Boltzmann model has been widely used to solve multi-phase and multi-component flow problems. However, original pseudopotential model cannot be used in simulating diffusion flow with large pressure difference because of its limitation. In this paper, we incorporate pseudopotential model with a new form of effective mass to solve this problem based on the relationship between pressure difference and effective mass. The improved model is verified through Laplace’s law and binary immiscible Poiseuille flow. By simulating pipeline binary diffusion flow and two-inlet binary cavity jet flow, we show that the improved model can achieve larger pressure difference than pseudopotential model with traditional effective mass forms.

  6. Action Research to Improve Collaboration among Student Support Services Teams

    ERIC Educational Resources Information Center

    Salm, Twyla

    2014-01-01

    This study explores action research as a professional development strategy to improve interprofessional collaboration in a school division team focused on supporting students with a variety of learning and behavioural needs. Occupational therapists, speech and language pathologists, a psychologist, and a social worker worked together to learn more…

  7. Improving Instruction in the Mathematics Methods Classroom through Action Research

    ERIC Educational Resources Information Center

    Mostofo, Jameel; Zambo, Ron

    2015-01-01

    There is a continuing emphasis in the United States on improving students' mathematical abilities, and one approach is to better prepare teachers. To investigate the potential usefulness of Lesson Study to better prepare teachers, one author set out to conduct action research on his classroom practice. Specifically, he sought to determine whether…

  8. Action for Healthy Kids Suggests that Improvements Are Needed

    ERIC Educational Resources Information Center

    Curriculum Review, 2008

    2008-01-01

    The Action for Healthy Kids (AFHK), a national non-profit group that addresses childhood obesity, released a special report warning that schools still need improvements to the quality of the foods they serve and the amount of physical activity opportunities they offer American children. The report also outlines a significant obstacle--most school…

  9. Action for Healthy Kids Suggests that Improvements Are Needed

    ERIC Educational Resources Information Center

    Curriculum Review, 2008

    2008-01-01

    The Action for Healthy Kids (AFHK), a national non-profit group that addresses childhood obesity, released a special report warning that schools still need improvements to the quality of the foods they serve and the amount of physical activity opportunities they offer American children. The report also outlines a significant obstacle--most school…

  10. Action Research to Improve Collaboration among Student Support Services Teams

    ERIC Educational Resources Information Center

    Salm, Twyla

    2014-01-01

    This study explores action research as a professional development strategy to improve interprofessional collaboration in a school division team focused on supporting students with a variety of learning and behavioural needs. Occupational therapists, speech and language pathologists, a psychologist, and a social worker worked together to learn more…

  11. Missile Defense: Actions Needed to Improve Transparency and Accountability

    DTIC Science & Technology

    2011-03-01

    Improve Transparency and Accountability March 2011 GAO-11-372 Report Documentation Page Form ApprovedOMB No. 0704-0188 Public reporting...AND SUBTITLE Missile Defense: Actions Needed to Improve Transparency and Accountability 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT... Transparency and Accountability Why GAO Did This Study Since 2002, Congress has directed GAO to assess the Missile Defense Agency’s (MDA) annual fiscal

  12. An improved lattice Boltzmann scheme for multiphase fluid with multi-range interactions

    SciTech Connect

    Maquignon, Nicolas; Duchateau, Julien; Roussel, Gilles; Rousselle, François; Renaud, Christophe

    2014-10-06

    Modeling of fluids with liquid to gas phase transition has become important for understanding many environmental or industrial processes. Such simulations need new techniques, because traditional solvers are often limited. The Lattice Boltzmann Model (LBM) allows simulate complex fluids, because its mesoscopic nature gives possibility to incorporate additional physics in comparison to usual methods. In this work, an improved lattice Boltzmann model for phase transition flow will be introduced. First, the state of art for Shan and Chen (SC) type of LBM will be reminded. Then, link to real thermodynamics will be established with Maxwell equal areas construction. Convergence to isothermal liquid vapor equilibrium will be shown and discussed. Inclusion of an equation of state for real fluid and better incorporation of force term is presented. Multi-range interactions have been used for SC model, but it hasn't been yet applied to real fluid with non-ideal equation of state. In this work, we evaluate this model when it is applied to real liquid-vapor equilibrium. We show that important differences are found for evaluation of gas density. In order to recover thermodynamic consistency, we use a new scheme for calculation of force term, which is a combination of multi range model and numerical weighting used by Gong and Cheng. We show the superiority of our new model by studying convergence to equilibrium values over a large temperature range. We prove that spurious velocities remaining at equilibrium are decreased.

  13. An improved lattice Boltzmann scheme for multiphase fluid with multi-range interactions

    NASA Astrophysics Data System (ADS)

    Maquignon, Nicolas; Duchateau, Julien; Roussel, Gilles; Rousselle, François; Renaud, Christophe

    2014-10-01

    Modeling of fluids with liquid to gas phase transition has become important for understanding many environmental or industrial processes. Such simulations need new techniques, because traditional solvers are often limited. The Lattice Boltzmann Model (LBM) allows simulate complex fluids, because its mesoscopic nature gives possibility to incorporate additional physics in comparison to usual methods. In this work, an improved lattice Boltzmann model for phase transition flow will be introduced. First, the state of art for Shan & Chen [1] [2] (SC) type of LBM will be reminded. Then, link to real thermodynamics will be established with Maxwell equal areas construction. Convergence to isothermal liquid vapor equilibrium will be shown and discussed. Inclusion of an equation of state for real fluid and better incorporation of force term is presented [4] [5]. Multi-range interactions have been used for SC model [8], but it hasn't been yet applied to real fluid with non-ideal equation of state. In this work, we evaluate this model when it is applied to real liquid-vapor equilibrium. We show that important differences are found for evaluation of gas density. In order to recover thermodynamic consistency, we use a new scheme for calculation of force term, which is a combination of multi range model and numerical weighting used by Gong & Cheng [6] [7]. We show the superiority of our new model by studying convergence to equilibrium values over a large temperature range. We prove that spurious velocities remaining at equilibrium are decreased.

  14. Training of Manual Actions Improves Language Understanding of Semantically Related Action Sentences

    PubMed Central

    Locatelli, Matteo; Gatti, Roberto; Tettamanti, Marco

    2012-01-01

    Conceptual knowledge accessed by language may involve the reactivation of the associated primary sensory-motor processes. Whether these embodied representations are indeed constitutive to conceptual knowledge is hotly debated, particularly since direct evidence that sensory-motor expertise can improve conceptual processing is scarce. In this study, we sought for this crucial piece of evidence, by training naive healthy subjects to perform complex manual actions and by measuring, before and after training, their performance in a semantic language task. Nineteen participants engaged in 3 weeks of motor training. Each participant was trained in three complex manual actions (e.g., origami). Before and after the training period, each subject underwent a series of manual dexterity tests and a semantic language task. The latter consisted of a sentence-picture semantic congruency judgment task, with 6 target congruent sentence-picture pairs (semantically related to the trained manual actions), 6 non-target congruent pairs (semantically unrelated), and 12 filler incongruent pairs. Manual action training induced a significant improvement in all manual dexterity tests, demonstrating the successful acquisition of sensory-motor expertise. In the semantic language task, the reaction times (RTs) to both target and non-target congruent sentence-picture pairs decreased after action training, indicating a more efficient conceptual-semantic processing. Noteworthy, the RTs for target pairs decreased more than those for non-target pairs, as indicated by the 2 × 2 interaction. These results were confirmed when controlling for the potential bias of increased frequency of use of target lexical items during manual training. The results of the present study suggest that sensory-motor expertise gained by training of specific manual actions can lead to an improvement of cognitive-linguistic skills related to the specific conceptual-semantic domain associated to the trained actions

  15. The Work Compatibility Improvement Framework: theory and application of improvement action and intervention strategies.

    PubMed

    Genaidy, Ash M; Rinder, Magda M; Sequeira, Reynold; A-Rehim, Amal D

    2009-05-01

    Challenges facing management of manufacturing firms can be transformed into asset gains by giving careful consideration to the worker-work environment interface. The benefits of a 'healthy' interface may lead to sizable reductions in rising health care costs and retention of highly qualified workers. This paper presents a novel approach for the 'improve' phase of the Work Compatibility Improvement Framework. The work tasks of this research consisted of: (a) fundamentals of cognitive-based improvement action and intervention; (b) design concepts and process of improvement action/intervention generation; (c) assessment model of estimated gains in company's assets; (d) application demonstration in the manufacturing sector. The process of improvement action/intervention generation is described, preceded by a description of the fundamentals of cognitive-based improvement action and intervention and system architecture. This is followed by a documentation of estimated asset gains as a result of the improvement plan. The results showed that expert workers were, on average, 78% in agreement with the algorithm-identified improvement actions. Their knowledge was used to update the recommended actions as well as to detail the multiple strategies required to address the improvement actions. As a result, an integrated improvement plan was developed resulting in estimated asset gains of $1.6 million, which was validated by the general manager. The research reported herein documented the theory and application of the 'improve' phase of the Work Compatibility Improvement Framework. The economic assessment of the suggested improvement is also reported and this has proved to be an important driver to secure the firm collaboration of manufacturing enterprise management. An integrated improvement solution plan backed by a detailed economic assessment of suggested improvements is essential to demonstrate the full potential of workplace micro- and macro-ergonomic interventions.

  16. Needed improvements in the development of systemic corrective actions.

    SciTech Connect

    Campisi, John A.

    2009-07-01

    There are indications that corrective actions, as implemented at Sandia National Laboratories are not fully adequate. Review of independent audits spanning multiple years provides evidence of recurring issues within the same or similar operations and programs. Several external audits have directly called into question the ability Sandia's assessment and evaluation processes to prevent recurrence. Examples of repeated findings include lockout/tagout programs, local exhaust ventilation controls and radiological controls. Recurrence clearly shows that there are underlying systemic factors that are not being adequately addressed by corrective actions stemming from causal analyses. Information suggests that improvements in the conduct of causal analyses and, more importantly, in the development of subsequent corrective actions are warranted. Current methodolgies include Management Oversight Risk Tree, developed in the early 1970s and Systemic Factors Analysis. Recommendations for improvements include review of other causal analysis systems, training, improved formality of operations, improved documentation, and a corporate method that uses truly systemic solutions. This report was written some years ago and is being published now to form the foundation for current, follow-on reports being developed. Some outdated material is recognized but is retained for report completeness.

  17. An improved immersed boundary-lattice Boltzmann method for simulating three-dimensional incompressible flows

    NASA Astrophysics Data System (ADS)

    Wu, J.; Shu, C.

    2010-07-01

    The recently proposed boundary condition-enforced immersed boundary-lattice Boltzmann method (IB-LBM) [14] is improved in this work to simulate three-dimensional incompressible viscous flows. In the conventional IB-LBM, the restoring force is pre-calculated, and the non-slip boundary condition is not enforced as compared to body-fitted solvers. As a result, there is a flow penetration to the solid boundary. This drawback was removed by the new version of IB-LBM [14], in which the restoring force is considered as unknown and is determined in such a way that the non-slip boundary condition is enforced. Since Eulerian points are also defined inside the solid boundary, the computational domain is usually regular and the Cartesian mesh is used. On the other hand, to well capture the boundary layer and in the meantime, to save the computational effort, we often use non-uniform mesh in IB-LBM applications. In our previous two-dimensional simulations [14], the Taylor series expansion and least squares-based lattice Boltzmann method (TLLBM) was used on the non-uniform Cartesian mesh to get the flow field. The final expression of TLLBM is an algebraic formulation with some weighting coefficients. These coefficients could be computed in advance and stored for the following computations. However, this way may become impractical for 3D cases as the memory requirement often exceeds the machine capacity. The other way is to calculate the coefficients at every time step. As a result, extra time is consumed significantly. To overcome this drawback, in this study, we propose a more efficient approach to solve lattice Boltzmann equation on the non-uniform Cartesian mesh. As compared to TLLBM, the proposed approach needs much less computational time and virtual storage. Its good accuracy and efficiency are well demonstrated by its application to simulate the 3D lid-driven cubic cavity flow. To valid the combination of proposed approach with the new version of IBM [14] for 3D flows

  18. Improving a playcentre science programme through action research

    NASA Astrophysics Data System (ADS)

    Jordan, Barbara

    1992-12-01

    Attitudes to science develop early in life. In early childhood, the almost exclusively female staff members lack confidence in the area of science, and are therefore unable to develop an adequate science program for their children. In an action research project involving one third of the adults staffing a playcentre, during one term, the science programme in the centre was considerably improved, on measures of dialogues with the children, and of planning activities specifically for science. The staff members, mothers in the playcentre, reported increased confidence in talking with children about science topics, and a significant change in their interaction patterns both with their own families and with other children in the playcentre science programme. The action research method was found to be particularly helpful in supporting the group of parents in improving their centre's science program.

  19. Improved methods for the study of hadronic physics from lattice QCD

    SciTech Connect

    Orginos, Konstantinos; Richards, David G.

    2015-03-01

    The solution of quantum chromodynamics (QCD) on a lattice provides a first-principles method for understanding QCD in the low-energy regime, and is thus an essential tool for nuclear physics. The generation of gauge configurations, the starting point for lattice calculations, requires the most powerful leadership-class computers available. However, to fully exploit such leadership-class computing requires increasingly sophisticated methods for obtaining physics observables from the underlying gauge ensembles. In this paper, we describe a variety of recent methods that have been used to advance our understanding of the spectrum and structure of hadrons through lattice QCD.

  20. Improved methods for the study of hadronic physics from lattice QCD

    SciTech Connect

    Orginos, Kostas; Richards, David

    2015-02-05

    The solution of QCD on a lattice provides a first-principles method for understanding QCD in the low-energy regime, and is thus an essential tool for nuclear physics. The generation of gauge configurations, the starting point for lattice calculations, requires the most powerful leadership-class computers available. However, to fully exploit such leadership-class computing requires increasingly sophisticated methods for obtaining physics observables from the underlying gauge ensembles. In this study, we describe a variety of recent methods that have been used to advance our understanding of the spectrum and structure of hadrons through lattice QCD.

  1. Do action video games improve perception and cognition?

    PubMed

    Boot, Walter R; Blakely, Daniel P; Simons, Daniel J

    2011-01-01

    Frequent action video game players often outperform non-gamers on measures of perception and cognition, and some studies find that video game practice enhances those abilities. The possibility that video game training transfers broadly to other aspects of cognition is exciting because training on one task rarely improves performance on others. At first glance, the cumulative evidence suggests a strong relationship between gaming experience and other cognitive abilities, but methodological shortcomings call that conclusion into question. We discuss these pitfalls, identify how existing studies succeed or fail in overcoming them, and provide guidelines for more definitive tests of the effects of gaming on cognition.

  2. An Improved Fitness Evaluation Mechanism with Memory in Spatial Prisoner's Dilemma Game on Regular Lattices

    NASA Astrophysics Data System (ADS)

    Wang, Juan; Liu, Li-Na; Dong, En-Zeng; Wang, Li

    2013-03-01

    To deeply understand the emergence of cooperation in natural, social and economical systems, we present an improved fitness evaluation mechanism with memory in spatial prisoner's dilemma game on regular lattices. In our model, the individual fitness is not only determined by the payoff in the current game round, but also by the payoffs in previous round bins. A tunable parameter, termed as the memory strength (μ), which lies between 0 and 1, is introduced into the model to regulate the ratio of payoffs of current and previous game rounds in the individual fitness calculation. When μ = 0, our model is reduced to the standard prisoner's dilemma game; while μ = 1 represents the case in which the payoff is totally determined by the initial strategies and thus it is far from the realistic ones. Extensive numerical simulations indicate that the memory effect can substantially promote the evolution of cooperation. For μ < 1, the stronger the memory effect, the higher the cooperation level, but μ = 1 leads to a pathological state of cooperation, but can partially enhance the cooperation in the very large temptation parameter. The current results are of great significance for us to account for the role of memory effect during the evolution of cooperation among selfish players.

  3. Improving the Response of a Wheel Speed Sensor by Using a RLS Lattice Algorithm

    PubMed Central

    Hernandez, Wilmar

    2006-01-01

    Among the complete family of sensors for automotive safety, consumer and industrial application, speed sensors stand out as one of the most important. Actually, speed sensors have the diversity to be used in a broad range of applications. In today's automotive industry, such sensors are used in the antilock braking system, the traction control system and the electronic stability program. Also, typical applications are cam and crank shaft position/speed and wheel and turbo shaft speed measurement. In addition, they are used to control a variety of functions, including fuel injection, ignition timing in engines, and so on. However, some types of speed sensors cannot respond to very low speeds for different reasons. What is more, the main reason why such sensors are not good at detecting very low speeds is that they are more susceptible to noise when the speed of the target is low. In short, they suffer from noise and generally only work at medium to high speeds. This is one of the drawbacks of the inductive (magnetic reluctance) speed sensors and is the case under study. Furthermore, there are other speed sensors like the differential Hall Effect sensors that are relatively immune to interference and noise, but they cannot detect static fields. This limits their operations to speeds which give a switching frequency greater than a minimum operating frequency. In short, this research is focused on improving the performance of a variable reluctance speed sensor placed in a car under performance tests by using a recursive least-squares (RLS) lattice algorithm. Such an algorithm is situated in an adaptive noise canceller and carries out an optimal estimation of the relevant signal coming from the sensor, which is buried in a broad-band noise background where we have little knowledge of the noise characteristics. The experimental results are satisfactory and show a significant improvement in the signal-to-noise ratio at the system output.

  4. Novel Fat-Link Fermion Actions

    SciTech Connect

    J. M. Zanotti; S. Bilson-Thompson; F. D. R. Bonnet; P. D. Coddington; D. B. Leinweber; A. G. Williams; J. B. Zhang; W. Melnitchouk; F. X. Lee

    2001-07-01

    The hadron mass spectrum is calculated in lattice QCD using a novel fat-link clover fermion action in which only the irrelevant operators in the fermion action are constructed using smeared links. The simulations are performed on a 16{sup 3} x 32 lattice with a lattice spacing of a=0.125 fm. We compare actions with n=4 and 12 smearing sweeps with a smearing fraction of 0.7. The n=4 Fat-Link Irrelevant Clover (FLIC) action provides scaling which is superior to mean-field improvement, and offers advantages over nonperturbative 0(a) improvement.

  5. Lattice QCD and High Baryon Density State

    SciTech Connect

    Nagata, Keitaro; Nakamura, Atsushi; Motoki, Shinji; Nakagawa, Yoshiyuki; Saito, Takuya

    2011-10-21

    We report our recent studies on the finite density QCD obtained from lattice QCD simulation with clover-improved Wilson fermions of two flavor and RG-improved gauge action. We approach the subject from two paths, i.e., the imaginary and chemical potentials.

  6. Systematic study of the hybrid plasmonic-photonic band structure underlying lasing action of diffractive plasmon particle lattices

    NASA Astrophysics Data System (ADS)

    Schokker, A. Hinke; van Riggelen, Floor; Hadad, Yakir; Alù, Andrea; Koenderink, A. Femius

    2017-02-01

    We study lasing in distributed feedback lasers made from square lattices of silver particles in a dye-doped waveguide. We present a systematic analysis and experimental study of the band structure underlying the lasing process as a function of the detuning between the particle plasmon resonance and the lattice Bragg diffraction condition. To this end, as gain medium we use either a polymer doped with Rh6G only, or polymer doped with a pair of dyes (Rh6G and Rh700) that act as a Förster energy transfer (FRET) pair. This allows for gain, respectively, at 590 or 700 nm when pumped at 532 nm, compatible with the achievable size tunability of silver particles embedded in the polymer. By polarization-resolved spectroscopic Fourier microscopy, we are able to observe the plasmonic/photonic band structure of the array, unraveling both the stop gap width, as well as the loss properties of the four involved bands at fixed lattice Bragg diffraction condition and as a function of detuning of the plasmon resonance. To explain the measurements we derive an analytical model that sheds insights on the lasing process in plasmonic lattices, highlighting the interaction between two competing resonant processes, one localized at the particle level around the plasmon resonance, and one distributed across the lattice. Both are shown to contribute to the lasing threshold and the overall emission properties of the array.

  7. Comprehensive Evaluation and Implementation of Improvement Actions in Butcher Shops

    PubMed Central

    Leotta, Gerardo A.; Brusa, Victoria; Galli, Lucía; Adriani, Cristian; Linares, Luciano; Etcheverría, Analía; Sanz, Marcelo; Sucari, Adriana; Peral García, Pilar; Signorini, Marcelo

    2016-01-01

    Foodborne pathogens can cause acute and chronic diseases and produce a wide range of symptoms. Since the consumption of ground beef is a risk factor for infections with some bacterial pathogens, we performed a comprehensive evaluation of butcher shops, implemented improvement actions for both butcher shops and consumers, and verified the impact of those actions implemented. A comprehensive evaluation was made and risk was quantified on a 1–100 scale as high-risk (1–40), moderate-risk (41–70) or low-risk (71–100). A total of 172 raw ground beef and 672 environmental samples were collected from 86 butcher shops during the evaluation (2010–2011) and verification (2013) stages of the study. Ground beef samples were analyzed for mesophilic aerobic organisms, Escherichia coli and coagulase-positive Staphylococcus aureus enumeration. Salmonella spp., E. coli O157:H7, non-O157 Shiga toxin-producing E. coli (STEC), and Listeria monocytogenes were detected and isolated from all samples. Risk quantification resulted in 43 (50.0%) high-risk, 34 (39.5%) moderate-risk, and nine (10.5%) low-risk butcher shops. Training sessions for 498 handlers and 4,506 consumers were held. Re-evaluation by risk quantification and microbiological analyses resulted in 19 (22.1%) high-risk, 42 (48.8%) moderate-risk and 25 (29.1%) low-risk butcher shops. The count of indicator microorganisms decreased with respect to the 2010–2011 period. After the implementation of improvement actions, the presence of L. monocytogenes, E. coli O157:H7 and stx genes in ground beef decreased. Salmonella spp. was isolated from 10 (11.6%) ground beef samples, without detecting statistically significant differences between both study periods (evaluation and verification). The percentage of pathogens in environmental samples was reduced in the verification period (Salmonella spp., 1.5%; L. monocytogenes, 10.7%; E. coli O157:H7, 0.6%; non-O157 STEC, 6.8%). Risk quantification was useful to identify those

  8. Comprehensive Evaluation and Implementation of Improvement Actions in Butcher Shops.

    PubMed

    Leotta, Gerardo A; Brusa, Victoria; Galli, Lucía; Adriani, Cristian; Linares, Luciano; Etcheverría, Analía; Sanz, Marcelo; Sucari, Adriana; Peral García, Pilar; Signorini, Marcelo

    2016-01-01

    Foodborne pathogens can cause acute and chronic diseases and produce a wide range of symptoms. Since the consumption of ground beef is a risk factor for infections with some bacterial pathogens, we performed a comprehensive evaluation of butcher shops, implemented improvement actions for both butcher shops and consumers, and verified the impact of those actions implemented. A comprehensive evaluation was made and risk was quantified on a 1-100 scale as high-risk (1-40), moderate-risk (41-70) or low-risk (71-100). A total of 172 raw ground beef and 672 environmental samples were collected from 86 butcher shops during the evaluation (2010-2011) and verification (2013) stages of the study. Ground beef samples were analyzed for mesophilic aerobic organisms, Escherichia coli and coagulase-positive Staphylococcus aureus enumeration. Salmonella spp., E. coli O157:H7, non-O157 Shiga toxin-producing E. coli (STEC), and Listeria monocytogenes were detected and isolated from all samples. Risk quantification resulted in 43 (50.0%) high-risk, 34 (39.5%) moderate-risk, and nine (10.5%) low-risk butcher shops. Training sessions for 498 handlers and 4,506 consumers were held. Re-evaluation by risk quantification and microbiological analyses resulted in 19 (22.1%) high-risk, 42 (48.8%) moderate-risk and 25 (29.1%) low-risk butcher shops. The count of indicator microorganisms decreased with respect to the 2010-2011 period. After the implementation of improvement actions, the presence of L. monocytogenes, E. coli O157:H7 and stx genes in ground beef decreased. Salmonella spp. was isolated from 10 (11.6%) ground beef samples, without detecting statistically significant differences between both study periods (evaluation and verification). The percentage of pathogens in environmental samples was reduced in the verification period (Salmonella spp., 1.5%; L. monocytogenes, 10.7%; E. coli O157:H7, 0.6%; non-O157 STEC, 6.8%). Risk quantification was useful to identify those relevant facts

  9. A relativistic O (a{sup 2}) improved action for heavy quarks

    SciTech Connect

    M. B. Oktay et al.

    2004-01-05

    The authors extend the Fermilab formalism for heavy quarks to develop an {Omicron}(a{sup 2}) improved relativistic action. They discuss their construction of the action, including the identification of redundant operators and the calculation of the improvement coefficients.

  10. B-meson decay constants from improved lattice nonrelativistic QCD with physical u, d, s, and c quarks.

    PubMed

    Dowdall, R J; Davies, C T H; Horgan, R R; Monahan, C J; Shigemitsu, J

    2013-05-31

    We present the first lattice QCD calculation of the decay constants f(B) and f(B(s)) with physical light quark masses. We use configurations generated by the MILC Collaboration including the effect of u, d, s, and c highly improved staggered quarks in the sea at three lattice spacings and with three u/d quark mass values going down to the physical value. We use improved nonrelativistic QCD (NRQCD) for the valence b quarks. Our results are f(B)=0.186(4) GeV, f(B(s))=0.224(4) GeV, f(B(s))/f(B)=1.205(7), and M(B(s))-M(B)=85(2) MeV, superseding earlier results with NRQCD b quarks. We discuss the implications of our results for the standard model rates for B((s))→μ(+)μ(-) and B→τν.

  11. Improving traffic safety: conceptual considerations for successful action.

    PubMed

    Sivak, Michael; Tsimhoni, Omer

    2008-01-01

    In the early stages of motorization, it did not take rigorous scientific research to achieve major improvements in traffic safety. Instead, early traffic-safety countermeasures were often based exclusively on common sense. Since then, scientific research has gradually increased in importance as the basis for developing successful interventions. This shift was not made by choice but mostly by necessity: many of the "easy" problems have already been addressed, and the remaining problems are generally too complex for an approach based solely on common sense. Fortunately, our understanding of the complexities involved in traffic safety has recently made major gains, and common sense can now be supplemented, to some degree, by valid technical analysis. This article discusses major conceptual issues that should be considered in guiding the future development of effective, science-based traffic-safety countermeasures. After briefly discussing the conceptual issues, the article offers a list of implications for action.

  12. Loss of CTRP5 improves insulin action and hepatic steatosis.

    PubMed

    Lei, Xia; Rodriguez, Susana; Petersen, Pia S; Seldin, Marcus M; Bowman, Caitlyn E; Wolfgang, Michael J; Wong, G William

    2016-06-01

    The gene that encodes C1q/TNF-related protein 5 (CTRP5), a secreted protein of the C1q family, is mutated in individuals with late-onset retinal degeneration. CTRP5 is widely expressed outside the eye and also circulates in plasma. Its physiological role in peripheral tissues, however, has yet to be elucidated. Here, we show that Ctrp5 expression is modulated by fasting and refeeding, and by different diets, in mice. Adipose expression of CTRP5 was markedly upregulated in obese and diabetic humans and in genetic and dietary models of obesity in rodents. Furthermore, human CTRP5 expression in the subcutaneous fat depot positively correlated with BMI. A genetic loss-of-function mouse model was used to address the metabolic function of CTRP5 in vivo. On a standard chow diet, CTRP5-deficient mice had reduced fasting insulin but were otherwise comparable with wild-type littermate controls in body weight and adiposity. However, when fed a high-fat diet, CTRP5-deficient animals had attenuated hepatic steatosis and improved insulin action. Loss of CTRP5 also improved the capacity of chow-fed aged mice to respond to subsequent high-fat feeding, as evidenced by decreased insulin resistance. In cultured adipocytes and myotubes, recombinant CTRP5 treatment attenuated insulin-stimulated Akt phosphorylation. Our results provide the first genetic and physiological evidence for CTRP5 as a negative regulator of glucose metabolism and insulin sensitivity. Inhibition of CTRP5 action may result in the alleviation of insulin resistance associated with obesity and diabetes.

  13. Properties of charmonium in lattice QCD with 2+1 flavors of improved staggered sea quarks

    SciTech Connect

    Massimo Di Pierro et al.

    2004-03-16

    We use the dynamical gluon configurations provided by the MILC collaboration in a study of the charmonium spectrum and {psi} leptonic width. We examine sea quark effects on mass splitting and on the leptonic decay matrix element for light masses as low as m{sub s}/5, while keeping the strange quark mass fixed and the lattice spacing nearly constant.

  14. Action Research to Improve the Learning Space for Diagnostic Techniques.

    PubMed

    Ariel, Ellen; Owens, Leigh

    2015-12-01

    The module described and evaluated here was created in response to perceived learning difficulties in diagnostic test design and interpretation for students in third-year Clinical Microbiology. Previously, the activities in lectures and laboratory classes in the module fell into the lower cognitive operations of "knowledge" and "understanding." The new approach was to exchange part of the traditional activities with elements of interactive learning, where students had the opportunity to engage in deep learning using a variety of learning styles. The effectiveness of the new curriculum was assessed by means of on-course student assessment throughout the module, a final exam, an anonymous questionnaire on student evaluation of the different activities and a focus group of volunteers. Although the new curriculum enabled a major part of the student cohort to achieve higher pass grades (p < 0.001), it did not meet the requirements of the weaker students, and the proportion of the students failing the module remained at 34%. The action research applied here provided a number of valuable suggestions from students on how to improve future curricula from their perspective. Most importantly, an interactive online program that facilitated flexibility in the learning space for the different reagents and their interaction in diagnostic tests was proposed. The methods applied to improve and assess a curriculum refresh by involving students as partners in the process, as well as the outcomes, are discussed. Journal of Microbiology & Biology Education.

  15. Action Research to Improve the Learning Space for Diagnostic Techniques†

    PubMed Central

    Ariel, Ellen; Owens, Leigh

    2015-01-01

    The module described and evaluated here was created in response to perceived learning difficulties in diagnostic test design and interpretation for students in third-year Clinical Microbiology. Previously, the activities in lectures and laboratory classes in the module fell into the lower cognitive operations of “knowledge” and “understanding.” The new approach was to exchange part of the traditional activities with elements of interactive learning, where students had the opportunity to engage in deep learning using a variety of learning styles. The effectiveness of the new curriculum was assessed by means of on-course student assessment throughout the module, a final exam, an anonymous questionnaire on student evaluation of the different activities and a focus group of volunteers. Although the new curriculum enabled a major part of the student cohort to achieve higher pass grades (p < 0.001), it did not meet the requirements of the weaker students, and the proportion of the students failing the module remained at 34%. The action research applied here provided a number of valuable suggestions from students on how to improve future curricula from their perspective. Most importantly, an interactive online program that facilitated flexibility in the learning space for the different reagents and their interaction in diagnostic tests was proposed. The methods applied to improve and assess a curriculum refresh by involving students as partners in the process, as well as the outcomes, are discussed. Journal of Microbiology & Biology Education PMID:26753024

  16. Collaborative Action Research: Can It Improve School Effectiveness?

    ERIC Educational Resources Information Center

    Sagor, Richard D.; Curley, Janet L.

    The impact of action research on student academic and social performance is examined in this paper. Project LEARN (League of Educational Action Researchers in the Northwest), a cooperative initiative with school districts to train teams of educators in collaborative action research, was evaluated in five participating schools--two elementary, one…

  17. Soft symmetry improvement of two particle irreducible effective actions

    NASA Astrophysics Data System (ADS)

    Brown, Michael J.; Whittingham, Ian B.

    2017-01-01

    Two particle irreducible effective actions (2PIEAs) are valuable nonperturbative techniques in quantum field theory; however, finite truncations of them violate the Ward identities (WIs) of theories with spontaneously broken symmetries. The symmetry improvement (SI) method of Pilaftsis and Teresi attempts to overcome this by imposing the WIs as constraints on the solution; however, the method suffers from the nonexistence of solutions in linear response theory and in certain truncations in equilibrium. Motivated by this, we introduce a new method called soft-symmetry improvement (SSI) which relaxes the constraint. Violations of WIs are allowed but punished in a least-squares implementation of the symmetry improvement idea. A new parameter ξ controls the strength of the constraint. The method interpolates between the unimproved (ξ →∞ ) and SI (ξ →0 ) cases, and the hope is that practically useful solutions can be found for finite ξ . We study the SSI 2PIEA for a scalar O (N ) model in the Hartree-Fock approximation. We find that the method is IR sensitive; the system must be formulated in finite volume V and temperature T =β-1 , and the V β →∞ limit must be taken carefully. Three distinct limits exist. Two are equivalent to the unimproved 2PIEA and SI 2PIEA respectively, and the third is a new limit where the WI is satisfied but the phase transition is strongly first order and solutions can fail to exist depending on ξ . Further, these limits are disconnected from each other; there is no smooth way to interpolate from one to another. These results suggest that any potential advantages of SSI methods, and indeed any application of (S)SI methods out of equilibrium, must occur in finite volume.

  18. Lattice field theory applications in high energy physics

    NASA Astrophysics Data System (ADS)

    Gottlieb, Steven

    2016-10-01

    Lattice gauge theory was formulated by Kenneth Wilson in 1974. In the ensuing decades, improvements in actions, algorithms, and computers have enabled tremendous progress in QCD, to the point where lattice calculations can yield sub-percent level precision for some quantities. Beyond QCD, lattice methods are being used to explore possible beyond the standard model (BSM) theories of dynamical symmetry breaking and supersymmetry. We survey progress in extracting information about the parameters of the standard model by confronting lattice calculations with experimental results and searching for evidence of BSM effects.

  19. Improvement of the precision of lattice parameter determination by nano-beam electron diffraction.

    PubMed

    Saitoh, Koh; Nakahara, Hirotaka; Tanaka, Nobuo

    2013-01-01

    A highly precise determination of lattice parameters using higher-order Laue zone (HOLZ) reflections observed in nano-beam electron diffraction is presented. The introduction of more than 40 HOLZ reflections, whose positions are corrected by considering the aberration of the electron optics and are determined with an accuracy of 0.04 nm⁻¹, allows us to achieve a remarkable high precision of a 0.02% error, which is four times higher than the precision without HOLZ reflections.

  20. Clinical scientists improving clinical practices: in thoughts and actions.

    PubMed

    Apel, Kenn

    2014-04-01

    In this article, the author comments on aspects of Kamhi's (2014) article, which caused the author to think more deeply about definitions of language, theories of learning, and how these two core components of intervention prepare clinical scientists as they search the literature for new knowledge. Interprofessional collaborative practice as a model for team-based intervention in school settings is also discussed. The article addresses aspects of Kamhi's article that aligned or did not align with the author's definition of language and theory of learning and explains why considering these alignments is important for clinical scientists. Two challenges to staying current with the research base are also described, and suggestions are offered for addressing these challenges. Finally, the article provides an overview of interprofessional collaborative practice. Clinical scientists should continue to strive to use their knowledge of what language is and how it is learned, combined with the best available scientific information, to best serve their clients. Combining their thoughts and actions, they undoubtedly will continuously improve their clinical practices.

  1. Running Newton constant, improved gravitational actions, and galaxy rotation curves

    SciTech Connect

    Reuter, M.; Weyer, H.

    2004-12-15

    A renormalization group (RG) improvement of the Einstein-Hilbert action is performed which promotes Newton's constant and the cosmological constant to scalar functions on spacetime. They arise from solutions of an exact RG equation by means of a 'cutoff identification' which associates RG scales to the points of spacetime. The resulting modified Einstein equations for spherically symmetric, static spacetimes are derived and analyzed in detail. The modifications of the Newtonian limit due to the RG evolution are obtained for the general case. As an application, the viability of a scenario is investigated where strong quantum effects in the infrared cause Newton's constant to grow at large (astrophysical) distances. For two specific RG trajectories exact vacuum spacetimes modifying the Schwarzschild metric are obtained by means of a solution-generating Weyl transformation. Their possible relevance to the problem of the observed approximately flat galaxy rotation curves is discussed. It is found that a power law running of Newton's constant with a small exponent of the order 10{sup -6} would account for their non-Keplerian behavior without having to postulate the presence of any dark matter in the galactic halo.

  2. Improved age estimates for key Late Quaternary European tephra horizons in the RESET lattice

    NASA Astrophysics Data System (ADS)

    Bronk Ramsey, Christopher; Albert, Paul G.; Blockley, Simon P. E.; Hardiman, Mark; Housley, Rupert A.; Lane, Christine S.; Lee, Sharen; Matthews, Ian P.; Smith, Victoria C.; Lowe, John J.

    2015-06-01

    The research project 'Response of Humans to Abrupt Environmental Transitions' (RESET) used tephra layers to tie together and synchronise the chronologies of stratigraphic records at archaeological and environmental sites. With the increasing importance of tephra as chronological markers in sedimentary sequences, both in this project and more generally, comes a requirement to have good estimates for the absolute age of these volcanic horizons. This paper summarises the chronology of the key tephra in the RESET tephra lattice in the time range 10-60 ka BP, from the existing literature, from papers produced as part of the RESET project, and reanalysis conducted for this paper. The paper outlines the chronological approach taken to the dating of tephra within the RESET project, and the basis for further work, as part of the INTIMATE (INTegrating Ice core MArine and TErrestrial records) initiative. For each of the tephra layers in the lattice, the existing literature is discussed and, where relevant date estimates updated using the latest radiocarbon calibration curves (IntCal13 and Marine13) and methods. Maps show the approximate extent of tephra finds, giving a visual indication of the coverage of the lattice in different time-periods.

  3. Lattice-Matched InGaAs–InAlAs Core–Shell Nanowires with Improved Luminescence and Photoresponse Properties

    PubMed Central

    2015-01-01

    Core–shell nanowires (NW) have become very prominent systems for band engineered NW heterostructures that effectively suppress detrimental surface states and improve performance of related devices. This concept is particularly attractive for material systems with high intrinsic surface state densities, such as the low-bandgap In-containing group-III arsenides, however selection of inappropriate, lattice-mismatched shell materials have frequently caused undesired strain accumulation, defect formation, and modifications of the electronic band structure. Here, we demonstrate the realization of closely lattice-matched radial InGaAs–InAlAs core–shell NWs tunable over large compositional ranges [x(Ga)∼y(Al) = 0.2–0.65] via completely catalyst-free selective-area molecular beam epitaxy. On the basis of high-resolution X-ray reciprocal space maps the strain in the NW core is found to be insignificant (ε < 0.1%), which is further reflected by the absence of strain-induced spectral shifts in luminescence spectra and nearly unmodified band structure. Remarkably, the lattice-matched InAlAs shell strongly enhances the optical efficiency by up to 2 orders of magnitude, where the efficiency enhancement scales directly with increasing band offset as both Ga- and Al-contents increase. Ultimately, we fabricated vertical InGaAs−InAlAs NW/Si photovoltaic cells and show that the enhanced internal quantum efficiency is directly translated to an energy conversion efficiency that is ∼3–4 times larger as compared to an unpassivated cell. These results highlight the promising performance of lattice-matched III–V core–shell NW heterostructures with significant impact on future development of related nanophotonic and electronic devices. PMID:25922974

  4. Lattice-Matched InGaAs-InAlAs Core-Shell Nanowires with Improved Luminescence and Photoresponse Properties.

    PubMed

    Treu, Julian; Stettner, Thomas; Watzinger, Marc; Morkötter, Stefanie; Döblinger, Markus; Matich, Sonja; Saller, Kai; Bichler, Max; Abstreiter, Gerhard; Finley, Jonathan J; Stangl, Julian; Koblmüller, Gregor

    2015-05-13

    Core-shell nanowires (NW) have become very prominent systems for band engineered NW heterostructures that effectively suppress detrimental surface states and improve performance of related devices. This concept is particularly attractive for material systems with high intrinsic surface state densities, such as the low-bandgap In-containing group-III arsenides, however selection of inappropriate, lattice-mismatched shell materials have frequently caused undesired strain accumulation, defect formation, and modifications of the electronic band structure. Here, we demonstrate the realization of closely lattice-matched radial InGaAs-InAlAs core-shell NWs tunable over large compositional ranges [x(Ga)∼y(Al) = 0.2-0.65] via completely catalyst-free selective-area molecular beam epitaxy. On the basis of high-resolution X-ray reciprocal space maps the strain in the NW core is found to be insignificant (ε < 0.1%), which is further reflected by the absence of strain-induced spectral shifts in luminescence spectra and nearly unmodified band structure. Remarkably, the lattice-matched InAlAs shell strongly enhances the optical efficiency by up to 2 orders of magnitude, where the efficiency enhancement scales directly with increasing band offset as both Ga- and Al-contents increase. Ultimately, we fabricated vertical InGaAs-InAlAs NW/Si photovoltaic cells and show that the enhanced internal quantum efficiency is directly translated to an energy conversion efficiency that is ∼3-4 times larger as compared to an unpassivated cell. These results highlight the promising performance of lattice-matched III-V core-shell NW heterostructures with significant impact on future development of related nanophotonic and electronic devices.

  5. Improving Educational Aspirations and Outcomes through Community Action Research

    ERIC Educational Resources Information Center

    Bleach, Josephine

    2013-01-01

    This paper examines how a community action research approach supported the implementation of an educational support programme for children, parents and local educators. The aim was the creation of a learning community that acknowledged, valued and used the expertise and experience of all involved. The action reflection cycle informed the…

  6. Improving Educational Aspirations and Outcomes through Community Action Research

    ERIC Educational Resources Information Center

    Bleach, Josephine

    2013-01-01

    This paper examines how a community action research approach supported the implementation of an educational support programme for children, parents and local educators. The aim was the creation of a learning community that acknowledged, valued and used the expertise and experience of all involved. The action reflection cycle informed the…

  7. Webinar: Healthy Schools, Healthy Students: Taking Action to Improve IAQ in Your School District

    EPA Pesticide Factsheets

    A page to register to view the first webinar in the IAQ Knowledge-to-Action Professional Training Webinar Series: Healthy Schools, Healthy Students: Taking Action to Improve IAQ in Your School District

  8. Improved control of exogenous attention in action video game players

    PubMed Central

    Cain, Matthew S.; Prinzmetal, William; Shimamura, Arthur P.; Landau, Ayelet N.

    2014-01-01

    Action video game players (VGPs) have demonstrated a number of attentional advantages over non-players. Here, we propose that many of those benefits might be underpinned by improved control over exogenous (i.e., stimulus-driven) attention. To test this we used an anti-cueing task, in which a sudden-onset cue indicated that the target would likely appear in a separate location on the opposite side of the fixation point. When the time between the cue onset and the target onset was short (40 ms), non-players (nVGPs) showed a typical exogenous attention effect. Their response times were faster to targets presented at the cued (but less probable) location compared with the opposite (more probable) location. VGPs, however, were less likely to have their attention drawn to the location of the cue. When the onset asynchrony was long (600 ms), VGPs and nVGPs were equally able to endogenously shift their attention to the likely (opposite) target location. In order to rule out processing-speed differences as an explanation for this result, we also tested VGPs and nVGPs on an attentional blink (AB) task. In a version of the AB task that minimized demands on task switching and iconic memory, VGPs and nVGPs did not differ in second target identification performance (i.e., VGPs had the same magnitude of AB as nVGPs), suggesting that the anti-cueing results were due to flexible control over exogenous attention rather than to more general speed-of-processing differences. PMID:24575061

  9. Improved control of exogenous attention in action video game players.

    PubMed

    Cain, Matthew S; Prinzmetal, William; Shimamura, Arthur P; Landau, Ayelet N

    2014-01-01

    Action video game players (VGPs) have demonstrated a number of attentional advantages over non-players. Here, we propose that many of those benefits might be underpinned by improved control over exogenous (i.e., stimulus-driven) attention. To test this we used an anti-cueing task, in which a sudden-onset cue indicated that the target would likely appear in a separate location on the opposite side of the fixation point. When the time between the cue onset and the target onset was short (40 ms), non-players (nVGPs) showed a typical exogenous attention effect. Their response times were faster to targets presented at the cued (but less probable) location compared with the opposite (more probable) location. VGPs, however, were less likely to have their attention drawn to the location of the cue. When the onset asynchrony was long (600 ms), VGPs and nVGPs were equally able to endogenously shift their attention to the likely (opposite) target location. In order to rule out processing-speed differences as an explanation for this result, we also tested VGPs and nVGPs on an attentional blink (AB) task. In a version of the AB task that minimized demands on task switching and iconic memory, VGPs and nVGPs did not differ in second target identification performance (i.e., VGPs had the same magnitude of AB as nVGPs), suggesting that the anti-cueing results were due to flexible control over exogenous attention rather than to more general speed-of-processing differences.

  10. Improved absolute frequency measurement of the 171Yb optical lattice clock at KRISS relative to the SI second

    NASA Astrophysics Data System (ADS)

    Kim, Huidong; Heo, Myoung-Sun; Lee, Won-Kyu; Park, Chang Yong; Hong, Hyun-Gue; Hwang, Sang-Wook; Yu, Dai-Hyuk

    2017-05-01

    We measured the absolute frequency of the 1S0-3P0 transition of 171Yb atom confined in a one-dimensional optical lattice relative to the SI second. The determined frequency was 518 295 836 590 863.38(57) Hz. The uncertainty was reduced by a factor of 14 compared with our previously reported value in 2013 due to the significant improvements in decreasing the systematic uncertainties. This result is expected to contribute to the determination of a new recommended value for the secondary representations of the second.

  11. 34 CFR 200.37 - Notice of identification for improvement, corrective action, or restructuring.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Lea and School Improvement § 200.37 Notice of identification for improvement, corrective action, or restructuring. (a) If an LEA identifies a school for improvement or subjects the school to corrective action or... of each child enrolled in the school of this identification. (b) The notice referred to in...

  12. 34 CFR 200.37 - Notice of identification for improvement, corrective action, or restructuring.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Lea and School Improvement § 200.37 Notice of identification for improvement, corrective action, or restructuring. (a) If an LEA identifies a school for improvement or subjects the school to corrective action or... of each child enrolled in the school of this identification. (b) The notice referred to in...

  13. Scaling study of the step scaling function in SU(3) gauge theory with improved gauge actions

    SciTech Connect

    Takeda, S.; Aoki, S.; Iwasaki, Y.; Kanaya, K.; Fukugita, M.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Kuramashi, Y.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.; Kaneko, T.

    2004-10-01

    We study the scaling behavior of the step scaling function for SU(3) gauge theory, employing the renormalization-group improved Iwasaki gauge action and the perturbatively improved Luescher-Weisz gauge action. We confirm that the step scaling functions from the improved gauge actions agree with that previously obtained from the plaquette action within errors in the continuum limit at both weak and strong coupling regions. We also investigate how different choices of boundary counterterms for the improved gauge actions affect the scaling behavior. In the extrapolation to the continuum limit, we observe that the cutoff dependence becomes moderate for the Iwasaki action, if a perturbative reduction of scaling violations is applied to the simulation results. We also measure the low energy scale ratio with the Iwasaki action and confirm its universality.

  14. An improved gray lattice Boltzmann model for simulating fluid flow in multi-scale porous media

    NASA Astrophysics Data System (ADS)

    Zhu, Jiujiang; Ma, Jingsheng

    2013-06-01

    A lattice Boltzmann (LB) model is proposed for simulating fluid flow in porous media by allowing the aggregates of finer-scale pores and solids to be treated as 'equivalent media'. This model employs a partially bouncing-back scheme to mimic the resistance of each aggregate, represented as a gray node in the model, to the fluid flow. Like several other lattice Boltzmann models that take the same approach, which are collectively referred to as gray lattice Boltzmann (GLB) models in this paper, it introduces an extra model parameter, ns, which represents a volume fraction of fluid particles to be bounced back by the solid phase rather than the volume fraction of the solid phase at each gray node. The proposed model is shown to conserve the mass even for heterogeneous media, while this model and that model of Walsh et al. (2009) [1], referred to the WBS model thereafter, are shown analytically to recover Darcy-Brinkman's equations for homogenous and isotropic porous media where the effective viscosity and the permeability are related to ns and the relaxation parameter of LB model. The key differences between these two models along with others are analyzed while their implications are highlighted. An attempt is made to rectify the misconception about the model parameter ns being the volume fraction of the solid phase. Both models are then numerically verified against the analytical solutions for a set of homogenous porous models and compared each other for another two sets of heterogeneous porous models of practical importance. It is shown that the proposed model allows true no-slip boundary conditions to be incorporated with a significant effect on reducing errors that would otherwise heavily skew flow fields near solid walls. The proposed model is shown to be numerically more stable than the WBS model at solid walls and interfaces between two porous media. The causes to the instability in the latter case are examined. The link between these two GLB models and a

  15. Hadron Masses From Novel Fat-Link Fermion Actions

    SciTech Connect

    J. M. Zanotti; S. Bilson-Thompson; F. D. R. Bonnet; P. D. Coddington; D. B. Leinweber; A. G. Williams; J. B. Zhang; W. Melnitchouk; F. X. Lee

    2001-11-01

    The hadron mass spectrum is calculated in lattice QCD using a novel fat-link clover fermion action in which only the irrelevant operators in the fermion action are constructed using smeared links. The simulations are performed on a 16{sup 3} x 32 lattice with a lattice spacing of a=0.125 fm. We compare actions with n=4 and 12 smearing sweeps with a smearing fraction of 0.7. The n=4 Fat-Link Irrelevant Clover (FLIC) action provides scaling which is superior to mean-field improvement, and offers advantages over nonperturbative 0(a) improvement, including a reduced exceptional configuration problem.

  16. An investigation of meson spectroscopy on isotropic clover lattices at the SU(3) flavor-symmetric point

    SciTech Connect

    Richards, David G.; Orginos, Konstantinos

    2014-06-23

    We present an investigation of the excited meson spectrum at the N_f= 3 point obtained on isotropic clover lattices with a plaquette Wilson gauge action, and a NP-improved clover fermion action, at a lattice spacing of a \\simeq 0.08 fm, and compare with corresponding calculations on an anisotropic lattice at fine temporal lattice spacing but a spatial lattice spacing of a_s \\simeq 0.125 fm. The methodology adopted follows that employed in the calculation of the spectrum on anisotropic lattices, and we test the efficacy of that approach for isotropic lattices. In particular, we explore the extent to which rotational symmetry for predominantly single-hadron states is realized. By comparison of the energy levels with that obtained using the anisotropic lattice, we obtain an indication of discretization uncertainties in the single-hadron spectrum.

  17. Action Research: An Educational Leader's Guide to School Improvement. Second Edition.

    ERIC Educational Resources Information Center

    Glanz, Jeffrey

    This book, in its second edition, is intended as a practical guide to conducting action research in schools--it outlines the process of designing and reporting an action research project. Contending that action research can be used as a powerful tool that can contribute to school renewal and instructional improvement, the book defines and presents…

  18. Flexible and Inexpensive: Improving Learning Transfer and Program Evaluation through Participant Action Plans

    ERIC Educational Resources Information Center

    Cowan, Chris A.; Goldman, Ellen F.; Hook, Melissa

    2010-01-01

    Action plans have been shown to improve transfer of learning and have proven an effective tool in training evaluation. This study describes how action planning was simply and successfully adapted to a preexisting curriculum with few additional resources. The decision to use participant action planning, the administration of it, and the…

  19. Action Research: An Educational Leader's Guide to School Improvement.

    ERIC Educational Resources Information Center

    Glanz, Jeffrey

    Useful as a classroom text and self-teaching tool, this book outlines the process of designing and reporting action research projects in schools. The underlying assumption of the book is that research is not a domain that belongs only to academics, but is a powerful approach that can be used by practitioners to contribute to school renewal and…

  20. Using Action Research to Engage Youth in Improving OST Programming

    ERIC Educational Resources Information Center

    Hubbard, Brian

    2015-01-01

    Youth are often portrayed as apathetic, uninvolved, and reluctant to participate in their communities (Baizerman, Hildreth, & Roholt, 2013). Ironically, however, communities offer few opportunities for youth to address issues that are compelling to their interests and that engage their commitment and action (Bradford & Cullen, 2012;…

  1. Improving Adolescent Learning: An Action Agenda. A TASC Report

    ERIC Educational Resources Information Center

    Duffrin, Elizabeth

    2014-01-01

    At a recent national forum at the Ford Foundation in New York, 140 education and youth development professionals discussed how to better support adolescent learning. Drawing on the discussion and the latest research in neuroscience, psychology and cognitive learning science, TASC presents an action agenda that can be tailored to circumstances in…

  2. Improving Adolescent Learning: An Action Agenda. A TASC Report

    ERIC Educational Resources Information Center

    Duffrin, Elizabeth

    2014-01-01

    At a recent national forum at the Ford Foundation in New York, 140 education and youth development professionals discussed how to better support adolescent learning. Drawing on the discussion and the latest research in neuroscience, psychology and cognitive learning science, TASC presents an action agenda that can be tailored to circumstances in…

  3. Action Research: An Educational Leader's Guide to School Improvement.

    ERIC Educational Resources Information Center

    Glanz, Jeffrey

    Useful as a classroom text and self-teaching tool, this book outlines the process of designing and reporting action research projects in schools. The underlying assumption of the book is that research is not a domain that belongs only to academics, but is a powerful approach that can be used by practitioners to contribute to school renewal and…

  4. A Plan of Action: Interactive School Improvement Constructs

    ERIC Educational Resources Information Center

    O'Connor, Benjamin; Moore, Thomas; Wittmer, John; Zornes, Alicia

    2013-01-01

    The following document represents a Problem Based Learning Project (PBL) around the central theme of school improvement, the components of school improvement, and the importance of the presence and interaction of five central components of school improvement. Five central components, or constructs, identified and selected from a breadth of…

  5. The Data-to-Action Framework: A Rapid Program Improvement Process

    ERIC Educational Resources Information Center

    Zakocs, Ronda; Hill, Jessica A.; Brown, Pamela; Wheaton, Jocelyn; Freire, Kimberley E.

    2015-01-01

    Although health education programs may benefit from quality improvement methods, scant resources exist to help practitioners apply these methods for program improvement. The purpose of this article is to describe the Data-to-Action framework, a process that guides practitioners through rapid-feedback cycles in order to generate actionable data to…

  6. The Data-to-Action Framework: A Rapid Program Improvement Process

    ERIC Educational Resources Information Center

    Zakocs, Ronda; Hill, Jessica A.; Brown, Pamela; Wheaton, Jocelyn; Freire, Kimberley E.

    2015-01-01

    Although health education programs may benefit from quality improvement methods, scant resources exist to help practitioners apply these methods for program improvement. The purpose of this article is to describe the Data-to-Action framework, a process that guides practitioners through rapid-feedback cycles in order to generate actionable data to…

  7. Improved lattice Boltzmann modeling of binary flow based on the conservative Allen-Cahn equation

    NASA Astrophysics Data System (ADS)

    Ren, Feng; Song, Baowei; Sukop, Michael C.; Hu, Haibao

    2016-08-01

    The primary and key task of binary fluid flow modeling is to track the interface with good accuracy, which is usually challenging due to the sharp-interface limit and numerical dispersion. This article concentrates on further development of the conservative Allen-Cahn equation (ACE) [Geier et al., Phys. Rev. E 91, 063309 (2015), 10.1103/PhysRevE.91.063309] under the framework of the lattice Boltzmann method (LBM), with incorporation of the incompressible hydrodynamic equations [Liang et al., Phys. Rev. E 89, 053320 (2014), 10.1103/PhysRevE.89.053320]. Utilizing a modified equilibrium distribution function and an additional source term, this model is capable of correctly recovering the conservative ACE through the Chapman-Enskog analysis. We also simulate four phase-tracking benchmark cases, including one three-dimensional case; all show good accuracy as well as low numerical dispersion. By coupling the incompressible hydrodynamic equations, we also simulate layered Poiseuille flow and the Rayleigh-Taylor instability, illustrating satisfying performance in dealing with complex flow problems, e.g., high viscosity ratio, high density ratio, and high Reynolds number situations. The present work provides a reliable and efficient solution for binary flow modeling.

  8. Final Report for Award DE-SC0005403. Improved Electrochemical Performance of Strained Lattice Electrolytes via Modulated Doping

    SciTech Connect

    Hertz, Joshua L.; Prasad, Ajay K.

    2015-09-06

    The enclosed document provides a final report to document the research performed at the University of Delaware under Grant DE-SC0005403: Improved Electrochemical Performance of Strained Lattice Electrolytes via Modulated Doping. The ultimate goal of this project was to learn how to systematically strain the inter-atomic distance in thin ceramic films and how to use this newfound control to improve the ease by which oxygen ions can conduct through the films. Increasing the ionic conductivity of ceramics holds the promise of drastic improvements in the performance of solid oxide fuel cells, chemical sensors, gas permeation membranes, and related devices. Before this work, the experimental evidence advocating for strain-based techniques was often controversial and poorly characterized. Enabling much of this work was a new method to quickly create a very wide range of ceramic nanostructures that was established during the first phase of the project. Following this initial phase, we created a variety of promising nanostructured epitaxial films and multilayers with systematic variations in lattice mismatch and dopant content. Over the course of the work, a positive effect of tensile atomic strain on the oxygen conductivity was conclusively found using a few different forms of samples and experimental techniques. The samples were built by sputtering, an industrially scalable technique, and thus the technological implementation of these results may be economically feasible. Still, two other results consistently achieved over multiple efforts in this work give pause. The first of these results was that very specific, pristine surfaces upon which to build the nanostructures were strictly required in order to achieve measurable results. The second of these results was that compressively strained films with concomitant reductions in oxygen conductivity are much easier to obtain relative to tensile-strained films with increased conductivity.

  9. Additional Actions Can Improve Naval Air Systems Command’s Use of Undefinitized Contractual Actions

    DTIC Science & Technology

    2011-06-08

    unlimited 13. SUPPLEMENTARY NOTES 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT Same as Report (SAR) 18...Naval Air Systems Command officials did not consistently comply with statutory and DoD requirements for managing undefinitized contractual actions...considered management comments on a draft of the report in preparing the final report. DoD Directive 7650.3 requires that recommendations be resolved

  10. Action Video Gaming and Cognitive Control: Playing First Person Shooter Games Is Associated with Improved Action Cascading but Not Inhibition

    PubMed Central

    Steenbergen, Laura; Sellaro, Roberta; Stock, Ann-Kathrin; Beste, Christian; Colzato, Lorenza S.

    2015-01-01

    There is a constantly growing interest in developing efficient methods to enhance cognitive functioning and/or to ameliorate cognitive deficits. One particular line of research focuses on the possibly cognitive enhancing effects that action video game (AVG) playing may have on game players. Interestingly, AVGs, especially first person shooter games, require gamers to develop different action control strategies to rapidly react to fast moving visual and auditory stimuli, and to flexibly adapt their behaviour to the ever-changing context. This study investigated whether and to what extent experience with such videogames is associated with enhanced performance on cognitive control tasks that require similar abilities. Experienced action videogame-players (AVGPs) and individuals with little to no videogame experience (NVGPs) performed a stop-change paradigm that provides a relatively well-established diagnostic measure of action cascading and response inhibition. Replicating previous findings, AVGPs showed higher efficiency in response execution, but not improved response inhibition (i.e. inhibitory control), as compared to NVGPs. More importantly, compared to NVGPs, AVGPs showed enhanced action cascading processes when an interruption (stop) and a change towards an alternative response were required simultaneously, as well as when such a change had to occur after the completion of the stop process. Our findings suggest that playing AVGs is associated with enhanced action cascading and multi-component behaviour without affecting inhibitory control. PMID:26655929

  11. Action Video Gaming and Cognitive Control: Playing First Person Shooter Games Is Associated with Improved Action Cascading but Not Inhibition.

    PubMed

    Steenbergen, Laura; Sellaro, Roberta; Stock, Ann-Kathrin; Beste, Christian; Colzato, Lorenza S

    2015-01-01

    There is a constantly growing interest in developing efficient methods to enhance cognitive functioning and/or to ameliorate cognitive deficits. One particular line of research focuses on the possibly cognitive enhancing effects that action video game (AVG) playing may have on game players. Interestingly, AVGs, especially first person shooter games, require gamers to develop different action control strategies to rapidly react to fast moving visual and auditory stimuli, and to flexibly adapt their behaviour to the ever-changing context. This study investigated whether and to what extent experience with such videogames is associated with enhanced performance on cognitive control tasks that require similar abilities. Experienced action videogame-players (AVGPs) and individuals with little to no videogame experience (NVGPs) performed a stop-change paradigm that provides a relatively well-established diagnostic measure of action cascading and response inhibition. Replicating previous findings, AVGPs showed higher efficiency in response execution, but not improved response inhibition (i.e. inhibitory control), as compared to NVGPs. More importantly, compared to NVGPs, AVGPs showed enhanced action cascading processes when an interruption (stop) and a change towards an alternative response were required simultaneously, as well as when such a change had to occur after the completion of the stop process. Our findings suggest that playing AVGs is associated with enhanced action cascading and multi-component behaviour without affecting inhibitory control.

  12. An Action Plan for Improving Mediocre or Stagnant Student Achievement

    ERIC Educational Resources Information Center

    Redmond, Kimberley B.

    2013-01-01

    Although all of the schools in the target school system adhere to a school improvement process, achievement scores remain mediocre or stagnant within the overseas school in Italy that serves children of United States armed service members. To address this problem, this study explored the target school's improvement process to discover how…

  13. Distance Education in Action: The Wisconsin Rural Reading Improvement Project.

    ERIC Educational Resources Information Center

    Wilsman, Margaret J.

    The Wisconsin Rural Reading Improvement Project implements a research-based telecommunications model of professional development and school improvement that rural school districts can use when redesigning K-12 reading curriculum. The project's approach to staff development assumes that change in school reading programs proceeds via extensive…

  14. An Action Plan for Improving Mediocre or Stagnant Student Achievement

    ERIC Educational Resources Information Center

    Redmond, Kimberley B.

    2013-01-01

    Although all of the schools in the target school system adhere to a school improvement process, achievement scores remain mediocre or stagnant within the overseas school in Italy that serves children of United States armed service members. To address this problem, this study explored the target school's improvement process to discover how…

  15. Improving oral health in women: nurses' call to action.

    PubMed

    Clemmens, Donna A; Kerr, A Ross

    2008-01-01

    The purpose of this article is to discuss the most significant oral health and related problems experienced by women, and to provide a Nurse's Plan of Action to respond to these largely preventable diseases. Oral health is integral to women's overall health and well-being, with poor oral health being associated with cancer, heart disease, diabetes, depression, and the birth of preterm, low-birthweight babies. Poor nutrition and lifestyle, principally tobacco and heavy alcohol use, can further increase the risk for oral diseases. Disparities are evident in women's reported poor access of regular dental care related to lack of dental insurance and low income. These facts are disturbing because most oral diseases are preventable. The Surgeon General's report on oral health in America (U.S. Department of Health and Human Services, 2000) and, more recently, the "National Call to Action to Promote Oral Health" (U.S. Department of Health and Human Services, 2003) emphasized the need for partnerships of key stakeholders, including nurses, to get involved in oral disease prevention. Nurses are in an ideal position to provide health promotion education and screening across the multitude of settings in which they work regarding oral health and risk factors for oral disease. Nursing interventions aimed at promoting healthy outcomes and preventing disease should include a focus on oral health.

  16. [Important action of improving adrenocortical function for certain diseases recovery].

    PubMed

    Shen, Zi-yin; Dong, Jing-cheng; Cai, Ding-fang

    2007-04-01

    It has been found that the hypofunction status of hypothalamus-pituitary-adrenal (HPA) axis exists in patients with Shen-yang deficiency syndrome of TCM, also presents in most asthma patients. Seasonal attack of asthma can be prevented with Shen-tonifying drugs by improving adrenocortical function. Since patients subject to long-term glucocorticoids display hypofunction condition of HPA axis, Shen-tonifying drugs should be helpful to gluocorticoid withdrawal for getting higher success rate. Basic researches also indicated that the activating of adrenocortical stem cells and promoting regeneration of adrenal cortex is one of the mechanisms underlying improvement of adrenocortical function. Series of research showed that hypofunction of adrenocortex is the general pathological change in some diseases, so, Shen-tonifying drugs act a part in unitarily modulating the adrenocortical function, to get the therapeutic effect of both regulating the whole and improving the local.

  17. Action Video Games Improve Direction Discrimination of Parafoveal Translational Global Motion but Not Reaction Times.

    PubMed

    Pavan, Andrea; Boyce, Matthew; Ghin, Filippo

    2016-10-01

    Playing action video games enhances visual motion perception. However, there is psychophysical evidence that action video games do not improve motion sensitivity for translational global moving patterns presented in fovea. This study investigates global motion perception in action video game players and compares their performance to that of non-action video game players and non-video game players. Stimuli were random dot kinematograms presented in the parafovea. Observers discriminated the motion direction of a target random dot kinematogram presented in one of the four visual quadrants. Action video game players showed lower motion coherence thresholds than the other groups. However, when the task was performed at threshold, we did not find differences between groups in terms of distributions of reaction times. These results suggest that action video games improve visual motion sensitivity in the near periphery of the visual field, rather than speed response.

  18. An Improved Lattice Boltzmann Model for Non-Newtonian Flows with Applications to Solid-Fluid Interactions in External Flows

    NASA Astrophysics Data System (ADS)

    Adam, Saad; Premnath, Kannan

    2016-11-01

    Fluid mechanics of non-Newtonian fluids, which arise in numerous settings, are characterized by non-linear constitutive models that pose certain unique challenges for computational methods. Here, we consider the lattice Boltzmann method (LBM), which offers some computational advantages due to its kinetic basis and its simpler stream-and-collide procedure enabling efficient simulations. However, further improvements are necessary to improve its numerical stability and accuracy for computations involving broader parameter ranges. Hence, in this study, we extend the cascaded LBM formulation by modifying its moment equilibria and relaxation parameters to handle a variety of non-Newtonian constitutive equations, including power-law and Bingham fluids, with improved stability. In addition, we include corrections to the moment equilibria to obtain an inertial frame invariant scheme without cubic-velocity defects. After preforming its validation study for various benchmark flows, we study the physics of non-Newtonian flow over pairs of circular and square cylinders in a tandem arrangement, especially the wake structure interactions and their effects on resulting forces in each cylinder, and elucidate the effect of the various characteristic parameters.

  19. FEASIBILITY OF HYDRAULIC FRACTURING OF SOILS TO IMPROVE REMEDIAL ACTIONS

    EPA Science Inventory

    Hydraulic fracturing, a technique commonly used to increase the yields of oil wells, could improve the effectiveness of several methods of in situ remediation. This project consisted of laboratory and field tests in which hydraulic fractures were created in soil. Laboratory te...

  20. FEASIBILITY OF HYDRAULIC FRACTURING OF SOILS TO IMPROVE REMEDIAL ACTIONS

    EPA Science Inventory

    Hydraulic fracturing, a technique commonly used to increase the yields of oil wells, could improve the effectiveness of several methods of in situ remediation. This project consisted of laboratory and field tests in which hydraulic fractures were created in soil. Laboratory te...

  1. The Partnership for Rural Improvement: Linking Knowledge and Action.

    ERIC Educational Resources Information Center

    Luther, Joseph; Braglio, Vicki Ann

    The major goals of the Partnership for Rural Improvement (PRI) are to explore models for rural development and planning and to engage institutions of higher learning in progressively greater collaboration in delivering services to rural areas. Knowledge of rural planning in a PRI area exists at three scales: planner-educator-facilitators, local…

  2. Can Two Person Zero Sum Game Theory Improve Military Decision-Making Course of Action Selection?

    DTIC Science & Technology

    2007-11-02

    Improve Military Decision Making Course of Action Selection? Unclassified 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR( S ...AGENCY NAME AND ADDRESS , 10. SPONSOR/MONITOR’S ACRONYM( S ) 11. SPONSOR/MONITOR’S REPORT NUMBER( S ) 12. DISTRIBUTION/AVAILABILITY STATEMENT APUBLIC...action. Remembering that the payoff s in the chart reflect losses to Player Two, the payoffs for Russian courses of action one, two and three are

  3. The K+ K+ scattering length from Lattice QCD

    SciTech Connect

    Silas Beane; Thomas Luu; Konstantinos Orginos; Assumpta Parreno; Martin Savage; Aaron Torok; Andre Walker-Loud

    2007-09-11

    The K+K+ scattering length is calculated in fully-dynamical lattice QCD with domain-wall valence quarks on the MILC asqtad-improved gauge configurations with fourth-rooted staggered sea quarks. Three-flavor mixed-action chiral perturbation theory at next-to-leading order, which includes the leading effects of the finite lattice spacing, is used to extrapolate the results of the lattice calculation to the physical value of mK + /fK + . We find mK^+ aK^+ K^+ = â~0.352 ± 0.016, where the statistical and systematic errors have been combined in quadrature.

  4. Lattice QCD for Baryon Rich Matter - Beyond Taylor Expansions

    NASA Astrophysics Data System (ADS)

    Bornyakov, V.; Boyda, D.; Goy, V.; Molochkov, A.; Nakamura, A.; Nikolaev, A.; Zakharov, V. I.

    2016-12-01

    We discuss our study for exploring the QCD phase diagram based on the lattice QCD. To go beyond the Taylor expansion and to reach higher density regions, we employ the canonical approach. In order to produce lattice data which meet experimental situation as much as possible, we propose a canonical approach with the charge and baryon number. We present our lattice QCD GPU code for this project which employs the clover improved Wilson fermions and Iwasaki gauge action to investigate pure imaginary chemical potential.

  5. Overlap fermions on a 20 4 lattice

    NASA Astrophysics Data System (ADS)

    Liu, K.-F.; Dong, S.-J.; Lee, F. X.; Zhang, J. B.

    2001-03-01

    We report results on hadron masses, fitting of the quenched chiral log, and quark masses from Neuberger's overlap fermion on a quenched 20 4 lattice with lattice spacing a = 0.15 fm. We used the improved gauge action which is shown to lower the density of small eigenvalues for H2 as compared to the Wilson gauge action. This makes the calculation feasible on 64 nodes of CRAY-T3E. Also presented is the pion mass on a small volume (6 3 × 12 with a Wilson gauge action at β = 5.7). We find that for configurations that the topological charge Q ≠ 0, the pion mass tends to a constant and for configurations with trivial topology, it approaches zero possibly linearly with the quark mass.

  6. Analysis of strategies to improve the directionality of square lattice band-edge photonic crystal structures.

    PubMed

    Hattori, Haroldo T; Schneider, Vitor M; Cazo, Rogério M; Barbosa, Carmem L

    2005-05-20

    Recently, photonic crystal band-edge structures have been analyzed in the literature. However, most devices that have been presented so far emit light in different directions. We present a modal analysis (no gain included) of a few schemes to improve the directionality of these devices, i.e., in such a way that light that exits from them will travel mainly in a certain direction, eventually coupling its energy to a wide waveguide.

  7. 34 CFR 200.49 - SEA responsibilities for school improvement, corrective action, and restructuring.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 34 Education 1 2010-07-01 2010-07-01 false SEA responsibilities for school improvement, corrective... Agencies Lea and School Improvement § 200.49 SEA responsibilities for school improvement, corrective action, and restructuring. (a) Transition requirements for public school choice and supplemental...

  8. Quest for More Information from Lattice QCD Simulations

    NASA Astrophysics Data System (ADS)

    de Forcrand, P.; García Pérez, M.; Hashimoto, T.; Hioki, S.; Matsufuru, H.; Miyamura, O.; Umeda, T.; Nakamura, A.; Stamatescu, I.-O.; Tago, Y.; Takaishi, T.

    Lattice QCD is one of the most powerful tools to study the non-perturbative nature of the strong interaction. Although much information has been obtained so far to understand QCD, the computational cost becomes higher and higher as we calculate on finer lattices; simulations near the continuum are still far beyond. We report the progress on (1) renormalization group (RG) improved actions and (2) anisotropic lattice, which QCD-TARO group has developed and studied in order to get more information from the simulations on the present computers. RG improved actions were proposed and studied by Wilson and Iwasaki to remove discretization effects for long distance observables. We have studied 1× 1 + 1× 2 type actions, which includes Wilson, Symanzik and Iwasaki ones, by the strong and weak coupling expansions and Monte Carlo RG method. We have calculated RG flow and obtained a new effective β-function. Anisotropic lattice, where the temporal lattice spacing is smaller than that along the spatial one, makes us possible to perform finer resolution measurements in the temporal direction. This is especially useful at the finite temperature, where the temporal lattice size is limited. We have calculated meson pole and screening masses. We have found they behave in a different manner as a function of T.

  9. ``Science Talks'' in Kindergarten Classrooms: Improving Classroom Practice Through Collaborative Action Research

    NASA Astrophysics Data System (ADS)

    Zhang, Meilan; Passalacqua, Susan; Lundeberg, Mary; Koehler, Matthew J.; Eberhardt, Jan; Parker, Joyce; Urban-Lurain, Mark; Zhang, Tianyi; Paik, Sunhee

    2010-03-01

    In this study we described an action research project enacted by a veteran Kindergarten teacher (Sarah) in the context of a professional development program. Over the course of a year, Sarah collaborated with other teachers in a small group to investigate how to use “Science Talks” to promote student learning in Kindergarten classrooms. A Problem-Based Learning approach was adopted to guide the collaborative action research. Based on a rich set of data sources, we concluded that Sarah’s action research improved student learning and led to her own professional growth. We also identified important conditions in support of action research.

  10. Dismantle or Improve ObamaCare? Nurses Must Take Action.

    PubMed

    Gardner, Deborah B

    2014-01-01

    Following the 2014 mid-term elections, what will the next 2 years of Republican leadership do to change the structures still being put into place to meet the goals of the Affordable Care Act (ACA)? Nurses need to be visible by creating partnerships with their new state and federal representatives and by demonstrating collaboration through identified shared values. Nurses must hold all congressional leaders accountable for continuing to improve access to quality and affordable health care, while containing costs and strengthening incentives to provide a client-centered approach to care delivery. As health care reform legislation is a highly charged political battleground, nurses must support legislative changes in the ACA that will strengthen our health care system, not weaken it.

  11. Thomas-Fermi Quark Model and Techniques to Improve Lattice QCD Calculation

    NASA Astrophysics Data System (ADS)

    Liu, Quan

    Two topics are discussed separately in this thesis. In the first part a semiclassical quark model, called the Thomas-Fermi quark model, is reviewed. After a modified approach to spin in the model is introduced, I present the calculation of the spectra of octet and decuplet baryons. The six-quark doubly strange H-dibaryon state is also investigated. In the second part, two numerical techniques which improve latice QCD calculations are covered. The first one, which we call Polynomial-Preconditioned GMRES-DR(PP-GMRESDR), is used to speed up the calculation of large systems of linear equations in LQCD. The second one, called the Polynomial-Subtraction method, is used to help reduce the noise variance of the calculations for disconnected loops in LQCD.

  12. Education to Action: Improving Public Perception of Bats

    PubMed Central

    Hoffmaster, Eric; Vonk, Jennifer; Mies, Rob

    2016-01-01

    Public perception of bats has historically been largely negative with bats often portrayed as carriers of disease. Bats are commonly associated with vampire lore and thus elicit largely fearful reactions despite the fact that they are a vital and valuable part of the ecosystem. Bats provide a variety of essential services from pest control to plant pollination. Despite the benefits of bats to the environment and the economy, bats are suffering at the hands of humans. They are victims of turbines, human encroachment, pesticides, and, most recently, white nose syndrome. Because of their critical importance to the environment, humans should do what they can to help protect bats. We propose that humans will be more likely to do so if their perceptions and attitudes toward bats can be significantly improved. In a preliminary study we found some support for the idea that people can be educated about bats through bat oriented events and exhibits, and that this greater knowledge can inspire humans to act to save bats. PMID:26784239

  13. Call to action: improving primary care for women with COPD.

    PubMed

    Tsiligianni, Ioanna; Rodríguez, Miguel Román; Lisspers, Karin; LeeTan, Tze; Infantino, Antonio

    2017-12-01

    In this perspective-based article, which is based on findings from a comprehensive literature search, we discuss the significant and growing burden of chronic obstructive pulmonary disease in women worldwide. Chronic obstructive pulmonary disease now affects both men and women almost equally. Despite this, there remains an outdated perception of chronic obstructive pulmonary disease as a male-dominated disease. Primary care physicians play a central role in overseeing the multidisciplinary care of women with chronic obstructive pulmonary disease. Many women with chronic obstructive pulmonary disease delay seeking medical assistance, due to fear of stigmatization or dismissing symptoms as a 'smoker's cough'. Improving awareness is important to encourage women with symptoms to seek advice earlier. Once women do seek help, primary care physicians need to have knowledge of the nuances of female chronic obstructive pulmonary disease disease presentation to avoid mis- or delayed diagnosis, both of which are more common in women with chronic obstructive pulmonary disease than men. Subsequent management should consider gender-specific issues, such as differential incidences of comorbid conditions, potentially higher symptom burden, and a higher risk of exacerbations. Chronic obstructive pulmonary disease treatment and smoking cessation management should be specifically tailored to the individual woman and reviewed regularly to optimize patient outcomes. Finally, education should be an integral part of managing chronic obstructive pulmonary disease in women as it will help to empower them to take control of their disease.

  14. Education to Action: Improving Public Perception of Bats.

    PubMed

    Hoffmaster, Eric; Vonk, Jennifer; Mies, Rob

    2016-01-15

    Public perception of bats has historically been largely negative with bats often portrayed as carriers of disease. Bats are commonly associated with vampire lore and thus elicit largely fearful reactions despite the fact that they are a vital and valuable part of the ecosystem. Bats provide a variety of essential services from pest control to plant pollination. Despite the benefits of bats to the environment and the economy, bats are suffering at the hands of humans. They are victims of turbines, human encroachment, pesticides, and, most recently, white nose syndrome. Because of their critical importance to the environment, humans should do what they can to help protect bats. We propose that humans will be more likely to do so if their perceptions and attitudes toward bats can be significantly improved. In a preliminary study we found some support for the idea that people can be educated about bats through bat oriented events and exhibits, and that this greater knowledge can inspire humans to act to save bats.

  15. An improved lattice Boltzmann method for incompressible two-phase flows with large density differences

    NASA Astrophysics Data System (ADS)

    Inamuro, Takaji; Yokoyama, Takaaki; Tanaka, Kentaro; Taniguchi, Motoki

    2013-11-01

    We propose a new LBM for two-phase fluid flows with high density ratios by improving the pressure computing of Inamuro et al.'s method (2004) [J. Comput. Phys. 198 (2004) 628] without solving the pressure Poisson equation. In the proposed method, the velocity and pressure fields are computed by using a single velocity distribution function even for high density ratios and by adjusting the speed of sound in a high density region to satisfy the continuity equation. In order to show the validity of the method, we apply the method to the simulations of a stationary drop, binary droplet collision, rising bubbles, and a milk crown. In a stationary drop, pressure and density profiles are computed, and the effect of a sound speed on time evolution of the pressure field in the drop. In the simulations of a binary droplet collision and rising bubbles, the computed results by the proposed method are compared with those by Inamuro et al.'s method (2004). A thin sheet and tiny drops can be computed in the simulation of a milk crown.

  16. Lattice radial quantization: 3D Ising

    NASA Astrophysics Data System (ADS)

    Brower, R. C.; Fleming, G. T.; Neuberger, H.

    2013-04-01

    Lattice radial quantization is introduced as a nonperturbative method intended to numerically solve Euclidean conformal field theories that can be realized as fixed points of known Lagrangians. As an example, we employ a lattice shaped as a cylinder with a 2D Icosahedral cross-section to discretize dilatations in the 3D Ising model. Using the integer spacing of the anomalous dimensions of the first two descendants (l = 1, 2), we obtain an estimate for η = 0.034 (10). We also observed small deviations from integer spacing for the 3rd descendant, which suggests that a further improvement of our radial lattice action will be required to guarantee conformal symmetry at the Wilson-Fisher fixed point in the continuum limit.

  17. Opportunities and constraints to improving milk quality in Ireland: enabling change through collective action.

    PubMed

    Devitt, C; McKenzie, K; More, S J; Heanue, K; McCoy, F

    2013-04-01

    Ireland plays a key role in contributing to the global supply of dairy produce, and increasing international demand, as well as the abolition of milk quotas in the European Union in 2015, present opportunities for the Irish milk industry. Improving milk quality is required to maximize these opportunities. National action on milk quality is spearheaded by Animal Health Ireland, yet the potential for collective action at an industry level is undermined by the inability of individual stakeholders to accept responsibility for action. In-depth qualitative interviews were conducted with n=12 stakeholder representatives. The theoretical concepts of collective action (i.e., when a group of people with a shared interest undertake some kind of voluntary common action in pursuit of that shared interest) is applied to understanding the results and identifying a collective way forward. Though consensus is apparent on the need to improve milk quality, differences exist about individual responsibility and the best way to achieve higher quality standards. The propensity for collective action is undermined by shifting responsibility to other stakeholders, stakeholder positions, trust concerns, and concerns over the commitment of other stakeholders to cooperate. Understanding how collective action works provides Animal Health Ireland with a knowledge framework in which to build stakeholder consensus. The paper concludes with practical examples of how Animal Health Ireland continues to apply this understanding by bringing individual stakeholders together to achieve milk quality improvement. Copyright © 2013 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.

  18. QCD thermodynamics on a lattice

    NASA Astrophysics Data System (ADS)

    Levkova, Ludmila A.

    Numerical simulations of full QCD on anisotropic lattices provide a convenient way to study QCD thermodynamics with fixed physics scales and reduced lattice spacing errors. We report results from calculations with two flavors of dynamical staggered fermions, where all bare parameters and the renormalized anisotropy are kept constant and the temperature is changed in small steps by varying only the number of time slices. Including results from zero-temperature scale setting simulations, which determine the Karsch coefficients, allows for the calculation of the Equation of State at finite temperatures. We also report on studies of the chiral properties of dynamical domain-wall fermions combined with the DBW2 gauge action for different gauge couplings and fermion masses. For quenched theories, the DBW2 action gives a residual chiral symmetry breaking much smaller than what was found with more traditional choices for the gauge action. Our goal is to investigate the possibilities which this and further improvements provide for the study of QCD thermodynamics and other simulations at stronger couplings.

  19. Improving Middle School Parental Engagement in Transition to Common Core State Standards: An Action Research Study

    ERIC Educational Resources Information Center

    Harla, Donna K.

    2014-01-01

    Parental involvement in schools is an important potential contributor to improving American education and making the U.S. more globally competitive. This qualitative and quantitative mixed-methodology action research study probed the viability of engaging parents around issues of educational improvement by inviting them to participate in training…

  20. Lesion Characteristics Related to Treatment Improvement in Object and Action Naming for Patients with Chronic Aphasia

    ERIC Educational Resources Information Center

    Parkinson, R. Bruce; Raymer, Anastasia; Chang, Yu-Ling; FitzGerald, David B.; Crosson, Bruce

    2009-01-01

    Few studies have examined the relationship between degree of lesion in various locations and improvement during treatment in stroke patients with chronic aphasia. The main purpose of this study was to determine whether the degree of lesion in specific brain regions was related to magnitude of improvement over the course of object and action naming…

  1. Lesion Characteristics Related to Treatment Improvement in Object and Action Naming for Patients with Chronic Aphasia

    ERIC Educational Resources Information Center

    Parkinson, R. Bruce; Raymer, Anastasia; Chang, Yu-Ling; FitzGerald, David B.; Crosson, Bruce

    2009-01-01

    Few studies have examined the relationship between degree of lesion in various locations and improvement during treatment in stroke patients with chronic aphasia. The main purpose of this study was to determine whether the degree of lesion in specific brain regions was related to magnitude of improvement over the course of object and action naming…

  2. From Questions to Actions: Using Questionnaire Data for Continuous School Improvement

    ERIC Educational Resources Information Center

    Bernhardt, Victoria L.; Geise, Bradley J.

    2009-01-01

    How do the best administrators find out how to improve their schools? They actively engage the people who work and study there. In "From Questions to Actions: Using Questionnaire Data for Continuous School Improvement," data experts Victoria L. Bernhardt and Bradley J. Geise explain how to collect and analyze data with an eye toward positive…

  3. From Questions to Actions: Using Questionnaire Data for Continuous School Improvement

    ERIC Educational Resources Information Center

    Bernhardt, Victoria L.; Geise, Bradley J.

    2009-01-01

    How do the best administrators find out how to improve their schools? They actively engage the people who work and study there. In "From Questions to Actions: Using Questionnaire Data for Continuous School Improvement," data experts Victoria L. Bernhardt and Bradley J. Geise explain how to collect and analyze data with an eye toward positive…

  4. Assessing Resilience: How Plans, Strategies, and After Action Reports Can Improve Our Understanding of Organizational Preparedness

    DTIC Science & Technology

    2016-09-01

    CAN IMPROVE OUR UNDERSTANDING OF ORGANIZATIONAL PREPAREDNESS 5. FUNDING NUMBERS 6. AUTHOR(S) Melissa Nussbaum 7. PERFORMING ORGANIZATION NAME(S...task could be performed ). Two specific components of resources to which the resilience management framework calls attention— human resources and...STRATEGIES, AND AFTER ACTION REPORTS CAN IMPROVE OUR UNDERSTANDING OF ORGANIZATIONAL PREPAREDNESS by Melissa Nussbaum September 2016 Thesis Co

  5. An Alternative Evacuation Framework to Improve Protective-action Strategies Following a Nuclear Power Accident: The Adaptive Protective Action Zone

    NASA Astrophysics Data System (ADS)

    Hammond, Gregory D.

    Within the U.S. current protective-action strategies to safeguard the public following a nuclear power accident have remained largely unchanged since their implementation in the early 1980s. In the past thirty years, new technologies have been introduced allowing faster computations, better modeling of predicted radiological consequences, and improved accident mapping with geographic information systems (GIS). Utilizing these new technologies, we evaluate the efficacy of alternative strategies, called adaptive protective action zones (APAZs), that use site-specific and event-specific data to dynamically determine evacuation boundaries with simple heuristics in order to better inform protective action decisions (rather than relying on pre-event regulatory bright lines). Several candidate APAZs were developed and then compared to the Nuclear Regulatory Commission's keyhole evacuation strategy (and full evacuation of the emergency planning zone). Two of the APAZs were better on average than existing NRC strategies at reducing either the radiological exposure, the population evacuated, or both. These APAZs are especially effective for larger radioactive plumes and at high population sites; one of them is better at reducing radiation exposure, while the other is better at reducing the population evacuated. However, should policy makers decide that the benefits of APAZs outweigh the costs of implementation, APAZ adoption by U.S. regulatory agencies should be accompanied by a revision to the nuclear-power plant emergency planning basis, and revisions to local nuclear power emergency response planning areas.

  6. An improved multiphase lattice Boltzmann flux solver for three-dimensional flows with large density ratio and high Reynolds number

    NASA Astrophysics Data System (ADS)

    Wang, Y.; Shu, C.; Yang, L. M.

    2015-12-01

    An improved multiphase lattice Boltzmann flux solver (MLBFS) is proposed in this work for effective simulation of three-dimensional (3D) multiphase flows with large density ratio and high Reynolds number. As a finite volume scheme, the MLBFS originally proposed in [27] applies the finite volume method to solve for macroscopic flow variables directly. The fluxes are reconstructed locally at each cell interface by using the standard LBM solutions. Due to the modeling error of the standard LBM, the reconstructed fluxes deviate from those in the Navier-Stokes equations; and to compensate this error, a complex tensor is introduced in the original MLBFS. However, the computation of the tensor introduces additional complexity and usually needs a relatively thicker interface thickness to maintain numerical stability, which makes the solver be complex and inefficient in the 3D case. To remove this drawback, in this work, a theoretical analysis to the formulations obtained from the Chapman-Enskog expansion is conducted. It is shown that the modeling error can be effectively removed by modifying the computation of the equilibrium density distribution function. With this improvement, the proposed 3D MLBFS not only avoids the calculation of the compensation tensor but also is able to maintain numerical stability with very thin interface thickness. Several benchmark cases, including the challenging droplet impacting on a dry surface, head-on collisions of binary droplets and droplet splashing on a thin film with density ratio 1000 and Reynolds number up to 3000, are studied to validate the proposed solver. The obtained results agree well with the published data.

  7. Lattice QCD calculation of the {rho} meson decay width

    SciTech Connect

    Aoki, S.; Fukugita, M.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Kuramashi, Y.; Ukawa, A.; Yoshie, T.; Kanaya, K.; Namekawa, Y.; Sasaki, K.

    2007-11-01

    We present a lattice QCD calculation of the {rho} meson decay width via the P-wave scattering phase shift for the I=1 two-pion system. Our calculation uses full QCD gauge configurations for N{sub f}=2 flavors generated using a renormalization group improved gauge action and an improved Wilson fermion action on a 12{sup 3}x24 lattice at m{sub {pi}}/m{sub {rho}}=0.41 and the lattice spacing 1/a=0.92 GeV. The phase shift calculated with the use of the finite size formula for the two-pion system in the moving frame shows a behavior consistent with the existence of a resonance at a mass close to the vector meson mass obtained in spectroscopy. The decay width estimated from the phase shift is consistent with the experiment, when the quark mass is scaled to the realistic value.

  8. Improved probabilistic inference as a general learning mechanism with action video games.

    PubMed

    Green, C Shawn; Pouget, Alexandre; Bavelier, Daphne

    2010-09-14

    Action video game play benefits performance in an array of sensory, perceptual, and attentional tasks that go well beyond the specifics of game play [1-9]. That a training regimen may induce improvements in so many different skills is notable because the majority of studies on training-induced learning report improvements on the trained task but limited transfer to other, even closely related, tasks ([10], but see also [11-13]). Here we ask whether improved probabilistic inference may explain such broad transfer. By using a visual perceptual decision making task [14, 15], the present study shows for the first time that action video game experience does indeed improve probabilistic inference. A neural model of this task [16] establishes how changing a single parameter, namely the strength of the connections between the neural layer providing the momentary evidence and the layer integrating the evidence over time, captures improvements in action-gamers behavior. These results were established in a visual, but also in a novel auditory, task, indicating generalization across modalities. Thus, improved probabilistic inference provides a general mechanism for why action video game playing enhances performance in a wide variety of tasks. In addition, this mechanism may serve as a signature of training regimens that are likely to produce transfer of learning.

  9. Semileptonic decays of D mesons in unquenched lattice QCD

    SciTech Connect

    Masataka Okamoto et al.

    2004-03-17

    We present our preliminary results for semileptonic form factors of D mesons in unquenched lattice QCD. Simulations are carried out with n{sub f} = 2 + 1 dynamical quarks using gauge configurations generated by the MILC collaboration. For the valence quarks, we adopt an improved staggered light quark action and the clover heavy quark action. Our results for D {yields} K and D {yields} {pi} form factors at q{sup 2} = 0 are in agreement with the experimental values.

  10. More on lattice BRST invariance

    NASA Astrophysics Data System (ADS)

    Bock, Wolfgang; Golterman, Maarten F. L.; Shamir, Yigal

    1998-11-01

    In the gauge-fixing approach to (chiral) lattice gauge theories, the action in the U(1) case implicitly contains a free ghost term, in accordance with the continuum Abelian theory. On the lattice there is no BRST symmetry and, without fermions, the partition function is strictly positive. Recently, Neuberger pointed out, Phys. Rev. D 58, 057502 (1998), that a different choice of the ghost term would lead to a BRST-invariant lattice model, which is ill defined nonperturbatively. We show that such a lattice model is inconsistent already in perturbation theory, and clearly different from the gauge-fixing approach.

  11. Follow up on the Actions to Improve the Defense Contract Management Agencys Cost Analysis Function

    DTIC Science & Technology

    2015-10-29

    B E R 2 9 , 2 0 1 5 Follow up on the Actions to Improve the Defense Contract Management Agency’s Cost Analysis Function Report No. DODIG-2016...Department of Defense F r a u d , W a s t e & A b u s e DODIG-2016-005 (D2015-DAPOCF-0032.000) │ i Results in Brief Follow up on the Actions to Improve the...Defense Contract Management Agency’s Cost Analysis Function Visit us at www.dodig.mil Objective We conducted this evaluation to follow up on the

  12. Lattice QCD

    SciTech Connect

    Bornyakov, V.G.

    2005-06-01

    Possibilities that are provided by a lattice regularization of QCD for studying nonperturbative properties of QCD are discussed. A review of some recent results obtained from computer calculations in lattice QCD is given. In particular, the results for the QCD vacuum structure, the hadron mass spectrum, and the strong coupling constant are considered.

  13. Additive lattice kirigami.

    PubMed

    Castle, Toen; Sussman, Daniel M; Tanis, Michael; Kamien, Randall D

    2016-09-01

    Kirigami uses bending, folding, cutting, and pasting to create complex three-dimensional (3D) structures from a flat sheet. In the case of lattice kirigami, this cutting and rejoining introduces defects into an underlying 2D lattice in the form of points of nonzero Gaussian curvature. A set of simple rules was previously used to generate a wide variety of stepped structures; we now pare back these rules to their minimum. This allows us to describe a set of techniques that unify a wide variety of cut-and-paste actions under the rubric of lattice kirigami, including adding new material and rejoining material across arbitrary cuts in the sheet. We also explore the use of more complex lattices and the different structures that consequently arise. Regardless of the choice of lattice, creating complex structures may require multiple overlapping kirigami cuts, where subsequent cuts are not performed on a locally flat lattice. Our additive kirigami method describes such cuts, providing a simple methodology and a set of techniques to build a huge variety of complex 3D shapes.

  14. Additive lattice kirigami

    PubMed Central

    Castle, Toen; Sussman, Daniel M.; Tanis, Michael; Kamien, Randall D.

    2016-01-01

    Kirigami uses bending, folding, cutting, and pasting to create complex three-dimensional (3D) structures from a flat sheet. In the case of lattice kirigami, this cutting and rejoining introduces defects into an underlying 2D lattice in the form of points of nonzero Gaussian curvature. A set of simple rules was previously used to generate a wide variety of stepped structures; we now pare back these rules to their minimum. This allows us to describe a set of techniques that unify a wide variety of cut-and-paste actions under the rubric of lattice kirigami, including adding new material and rejoining material across arbitrary cuts in the sheet. We also explore the use of more complex lattices and the different structures that consequently arise. Regardless of the choice of lattice, creating complex structures may require multiple overlapping kirigami cuts, where subsequent cuts are not performed on a locally flat lattice. Our additive kirigami method describes such cuts, providing a simple methodology and a set of techniques to build a huge variety of complex 3D shapes. PMID:27679822

  15. Fluctuations of conserved charges at finite temperature from lattice QCD

    NASA Astrophysics Data System (ADS)

    Borsányi, Szabolcs; Fodor, Zoltán; Katz, Sándor D.; Krieg, Stefan; Ratti, Claudia; Szabó, Kálman

    2012-01-01

    We present the full results of the Wuppertal-Budapest lattice QCD collaboration on flavor diagonal and non-diagonal quark number susceptibilities with 2 + 1 staggered quark flavors, in a temperature range between 125 and 400 MeV. The light and strange quark masses are set to their physical values. Lattices with N t = 6, 8, 10, 12, 16 are used. We perform a continuum extrapolation of all observables under study. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. All results are compared to the Hadron Resonance Gas model predictions: good agreement is found in the temperature region below the transition.

  16. Improving Cardiac Action Potential Measurements: 2D and 3D Cell Culture.

    PubMed

    Daily, Neil J; Yin, Yue; Kemanli, Pinar; Ip, Brian; Wakatsuki, Tetsuro

    2015-11-01

    Progress in the development of assays for measuring cardiac action potential is crucial for the discovery of drugs for treating cardiac disease and assessing cardiotoxicity. Recently, high-throughput methods for assessing action potential using induced pluripotent stem cell (iPSC) derived cardiomyocytes in both two-dimensional monolayer cultures and three-dimensional tissues have been developed. We describe an improved method for assessing cardiac action potential using an ultra-fast cost-effective plate reader with commercially available dyes. Our methods improve dramatically the detection of the fluorescence signal from these dyes and make way for the development of more high-throughput methods for cardiac drug discovery and cardiotoxicity.

  17. Search for the pentaquark resonance signature in lattice QCD

    SciTech Connect

    B. G. Lasscock; J. Hedditch; Derek Leinweber; Wolodymyr Melnitchouk; Anthony Thomas; A. G. Williams; R. D. Young; James Zanotti

    2005-02-01

    Claims concerning the possible discovery of the {Theta}{sup +} pentaquark, with minimal quark content uudd{bar s}, have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various pentaquark interpolating fields in the literature and create a new candidate ideal for lattice QCD simulations. Using these interpolating fields we attempt to isolate a signal for a five-quark resonance. Calculations are performed using improved actions on a large 20{sup 3} x 40 lattice in the quenched approximation. The standard lattice resonance signal of increasing attraction between baryon constituents for increasing quark mass is not observed for spin-1/2 pentaquark states. We conclude that evidence supporting the existence of a spin-1/2 pentaquark resonance does not exist in quenched QCD.

  18. Search for the pentaquark resonance signature in lattice QCD

    SciTech Connect

    B. G. Lasscock; J. Hedditch; D. B. Leinweber; W. Melnitchouk; A. W. Thomas; A. G. Williams; R. D. Young; J. M. Zanotti

    2005-03-01

    Claims concerning the possible discovery of the $\\Theta^+$ pentaquark, with minimal quark content $uudd\\bar{s}$, have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various pentaquark interpolating fields in the literature and create a new candidate ideal for lattice QCD simulations. Using these interpolating fields we attempt to isolate a signal for a five-quark resonance. Calculations are performed using improved actions on a large $20^{3} \\times 40$ lattice in the quenched approximation. The standard lattice resonance signal of increasing attraction between baryon constituents for increasing quark mass is not observed for spin-1/2 pentaquark states. We conclude that evidence supporting the existence of a spin-1/2 pentaquark resonance does not exist in quenched QCD.

  19. Lesion characteristics related to treatment improvement in object and action naming for patients with chronic aphasia.

    PubMed

    Parkinson, Bruce R; Raymer, Anastasia; Chang, Yu-Ling; Fitzgerald, David B; Crosson, Bruce

    2009-08-01

    Few studies have examined the relationship between degree of lesion in various locations and improvement during treatment in stroke patients with chronic aphasia. The main purpose of this study was to determine whether the degree of lesion in specific brain regions was related to magnitude of improvement over the course of object and action naming treatments. Fifteen left hemisphere stroke patients with aphasia participated in treatments for object and/or action naming. Two raters assessed extent of lesion in 18 left hemisphere cortical and subcortical regions of interest (ROIs) on CT or MRI scans. Correlations were calculated between composite basal ganglia, anterior cortical, and posterior cortical lesion ratings, on the one hand, and both pretreatment scores and treatment change for both object and action naming, on the other hand. Unexpectedly, greater anterior cortical lesion extent was highly correlated with better object and action naming scores prior to treatment and with greater improvement during treatment when partial correlations controlled for total basal ganglia lesion extent (r ranging from .730 to .858). Greater total basal ganglia lesion extent was highly correlated with worse object and action naming scores prior to treatment and with less improvement during treatment when partial correlations controlled for total anterior lesion extent (r ranging from -.623 to -.785). Correlations between degree of posterior cortical lesion and naming indices generally were not significant. No consistent differences were found between the correlations of ROI lesion ratings with object naming versus action naming scores. Large anterior cortical lesions and intactness of the basal ganglia may both contribute to more efficient reorganization of language functions.

  20. An Action Research on Improvement of Reading Comprehension of CET4

    ERIC Educational Resources Information Center

    Luo, Jian-ping

    2013-01-01

    This action research is aiming at improvement of reading comprehension of College English teaching and learning, which is a major time-consuming course with low efficiency in colleges and universities in China. The research subjects were 134 first-year college students of science, engineering and liberal arts, who were from either developed…

  1. One School's Approach to Overcoming Resistance and Improving Appraisal: Organizational Learning in Action

    ERIC Educational Resources Information Center

    Piggot-Irvine, Eileen

    2010-01-01

    This article reports on the action research (AR) approach adopted by one New Zealand (NZ) primary school to review and improve its appraisal system. Historically the staff had demonstrated considerable negativity towards appraisal. The classic reconnaissance, implementation and evaluation phases of AR were adopted by the case study school as a…

  2. Using Action Research Interventions to Improve the Effectiveness of an Executive Team

    ERIC Educational Resources Information Center

    McCarty, Timothy

    2010-01-01

    Purpose: The purpose of this study was to conduct an in-depth investigation of an executive team, to determine which internal and external factors impacted the team and to determine in what ways action research interventions improved the team's effectiveness. Methodology: The subjects in this study were seven members of a school district…

  3. An Action Research Study Designed to Implement Student Negotiation to Improve Speaking Classroom Practice in Turkey

    ERIC Educational Resources Information Center

    Uztosun, Mehmet Sercan; Skinner, Nigel; Cadorath, Jill

    2014-01-01

    This paper reports the second stage of an action research study designed to improve the effectiveness of speaking classes through negotiating the lesson contents with students. The data were collected through interviews, questionnaires and observations as a way of eliciting students' views. The research, conducted in an English language teaching…

  4. Improving First Year Mathematics Teaching through Making Connections: An Action Research Approach

    ERIC Educational Resources Information Center

    Balatti, Jo; Belward, Shaun

    2012-01-01

    Four university lecturers at an Australian university have been undertaking an action research project for almost two years to improve first year mathematics teaching. The project is analysed here through the single idea of "connection". Making new connections or changing the nature of existing connections with colleagues and especially…

  5. Improving Indigenous Completion Rates in Mainstream TAFE: An Action Research Approach

    ERIC Educational Resources Information Center

    Balatti, Jo; Gargano, Lyn; Goldman, Martha; Wood, Gary; Woodlock, Julie

    2004-01-01

    Indigenous engagement with vocational education and training (VET) has improved significantly, but successful Indigenous completion rates are lower nationally when compared to the overall population. This report, based on an action research project, examines intra-institutional factors at four Queensland TAFE (technical and further education)…

  6. Moving from I to Us: The Power of Action Research To Improve Students' Writing Performance.

    ERIC Educational Resources Information Center

    Miller, A. Christine; Cross, Lorraine

    Project WATCH! (Writing Across the Curriculum Hawks!) was the 1999-2000 schoolwide action research project at the A.D. Henderson University School grades K-8. The study question, "How can teachers build schoolwide capacity to support improved student writing across the curriculum?", examined whole-school collaboration where all teachers understand…

  7. Improving Teachers' Practices through Supervision and Observations by School Principals: An Action Research Project

    ERIC Educational Resources Information Center

    Taylor, Latasha M.

    2013-01-01

    This study focused on the impact of a new observation tool for principals to utilize and the effects it has on improving teachers' instruction and influencing best practices. The action research project explored the impact and influence that a well-developed observation tool could possess to help address areas of need; essentially, focusing on how…

  8. Seeking to Improve African American Girls' Attitudes toward Science: A Participatory Action Research Project

    ERIC Educational Resources Information Center

    Buck, Gayle A.; Cook, Kristin L.; Quigley, Cassie F.; Prince, Pearl; Lucas, Yvonne

    2014-01-01

    In this participatory action research study, we answered the question, How can we improve attitudes toward science education of the African American girls at an elementary school? Girls in grades 3-6 completed the Modified Attitudes toward Science Inventory. A purposeful sample of 30 girls participated in several focus-group interviews throughout…

  9. One School's Approach to Overcoming Resistance and Improving Appraisal: Organizational Learning in Action

    ERIC Educational Resources Information Center

    Piggot-Irvine, Eileen

    2010-01-01

    This article reports on the action research (AR) approach adopted by one New Zealand (NZ) primary school to review and improve its appraisal system. Historically the staff had demonstrated considerable negativity towards appraisal. The classic reconnaissance, implementation and evaluation phases of AR were adopted by the case study school as a…

  10. Improving Teachers' Practices through Supervision and Observations by School Principals: An Action Research Project

    ERIC Educational Resources Information Center

    Taylor, Latasha M.

    2013-01-01

    This study focused on the impact of a new observation tool for principals to utilize and the effects it has on improving teachers' instruction and influencing best practices. The action research project explored the impact and influence that a well-developed observation tool could possess to help address areas of need; essentially, focusing on how…

  11. An Action Research Study Designed to Implement Student Negotiation to Improve Speaking Classroom Practice in Turkey

    ERIC Educational Resources Information Center

    Uztosun, Mehmet Sercan; Skinner, Nigel; Cadorath, Jill

    2014-01-01

    This paper reports the second stage of an action research study designed to improve the effectiveness of speaking classes through negotiating the lesson contents with students. The data were collected through interviews, questionnaires and observations as a way of eliciting students' views. The research, conducted in an English language teaching…

  12. An Evaluation of Professional Development to Improve Teachers' Perspectives and Behaviors: An Action Research Study

    ERIC Educational Resources Information Center

    Beckford-Young, Paulette Vivienne

    2016-01-01

    The purpose of this action research study was to conduct a professional development activity to provide content-area teachers with academic vocabulary strategies to be implemented during instruction on a daily basis. Professional development is essential for teachers to gain new knowledge and skills in order to hone their craft to improve student…

  13. Seeking to Improve African American Girls' Attitudes toward Science: A Participatory Action Research Project

    ERIC Educational Resources Information Center

    Buck, Gayle A.; Cook, Kristin L.; Quigley, Cassie F.; Prince, Pearl; Lucas, Yvonne

    2014-01-01

    In this participatory action research study, we answered the question, How can we improve attitudes toward science education of the African American girls at an elementary school? Girls in grades 3-6 completed the Modified Attitudes toward Science Inventory. A purposeful sample of 30 girls participated in several focus-group interviews throughout…

  14. Action Research for Instructional Improvement: The Bad, the Ugly, and the Good

    ERIC Educational Resources Information Center

    Patthey, Ghislaine Genevieve; Thomas-Spiegel, Joan

    2013-01-01

    In the wake of accreditation cycles stressing student outcomes, we believed the reflective and practitioner-centered philosophy of action research a perfect fit for effecting institutional improvements for a four-year grant-funded effort in our urban-suburban community colleges in California. We learned that things were both worse and better than…

  15. Improving "At-Action" Decision-Making in Team Sports through a Holistic Coaching Approach

    ERIC Educational Resources Information Center

    Light, Richard L.; Harvey, Stephen; Mouchet, Alain

    2014-01-01

    This article draws on Game Sense pedagogy and complex learning theory (CLT) to make suggestions for improving decision-making ability in team sports by adopting a holistic approach to coaching with a focus on decision-making "at-action". It emphasizes the complexity of decision-making and the need to focus on the game as a whole entity,…

  16. Improving the Process of Career Decision Making: An Action Research Approach

    ERIC Educational Resources Information Center

    Greenbank, Paul

    2011-01-01

    Purpose: This study adopts an action research approach with the aim of improving the process of career decision making among undergraduates in a business school at a "new" university in the UK. Design/methodology/approach: The study utilised unfreezing techniques, multiple case studies in conjunction with the principle of analogical…

  17. Action-based Research Teams: Collaborating To Improve Science Instruction. Injecting Energy into Science Education.

    ERIC Educational Resources Information Center

    Krockover, Gerald; Adams, Paul; Eichinger, David; Nakhleh, Mary; Shepardson, Daniel

    2001-01-01

    Describes a project based on the collaboration of scientists, science educators, graduate and undergraduate students, and master teachers for the improvement of teaching introductory science courses. Uses action-based research teams (ABRTs) as the teaching tool to change the curriculum, which provides a mechanism for the implementation of changes…

  18. Using Action Research Interventions to Improve the Effectiveness of an Executive Team

    ERIC Educational Resources Information Center

    McCarty, Timothy

    2010-01-01

    Purpose: The purpose of this study was to conduct an in-depth investigation of an executive team, to determine which internal and external factors impacted the team and to determine in what ways action research interventions improved the team's effectiveness. Methodology: The subjects in this study were seven members of a school district…

  19. Action Research for Instructional Improvement: The Bad, the Ugly, and the Good

    ERIC Educational Resources Information Center

    Patthey, Ghislaine Genevieve; Thomas-Spiegel, Joan

    2013-01-01

    In the wake of accreditation cycles stressing student outcomes, we believed the reflective and practitioner-centered philosophy of action research a perfect fit for effecting institutional improvements for a four-year grant-funded effort in our urban-suburban community colleges in California. We learned that things were both worse and better than…

  20. Improving "At-Action" Decision-Making in Team Sports through a Holistic Coaching Approach

    ERIC Educational Resources Information Center

    Light, Richard L.; Harvey, Stephen; Mouchet, Alain

    2014-01-01

    This article draws on Game Sense pedagogy and complex learning theory (CLT) to make suggestions for improving decision-making ability in team sports by adopting a holistic approach to coaching with a focus on decision-making "at-action". It emphasizes the complexity of decision-making and the need to focus on the game as a whole entity,…

  1. Defense Acquisition Workforce: Actions Needed to Guide Planning Efforts and Improve Workforce Capability

    DTIC Science & Technology

    2015-12-01

    DEFENSE ACQUISITION WORKFORCE Actions Needed to Guide Planning Efforts and Improve Workforce Capability Report... Planning Efforts and Improve Workforce Capability Why GAO Did This Study GAO and others have found that DOD needs to take steps to ensure DOD...develop an acquisition workforce plan every 2 years. DOD issued a plan in 2010, in which it called for the department to increase the size of the

  2. Action Video Games Do Not Improve the Speed of Information Processing in Simple Perceptual Tasks

    PubMed Central

    van Ravenzwaaij, Don; Boekel, Wouter; Forstmann, Birte U.; Ratcliff, Roger; Wagenmakers, Eric-Jan

    2015-01-01

    Previous research suggests that playing action video games improves performance on sensory, perceptual, and attentional tasks. For instance, Green, Pouget, and Bavelier (2010) used the diffusion model to decompose data from a motion detection task and estimate the contribution of several underlying psychological processes. Their analysis indicated that playing action video games leads to faster information processing, reduced response caution, and no difference in motor responding. Because perceptual learning is generally thought to be highly context-specific, this transfer from gaming is surprising and warrants corroborative evidence from a large-scale training study. We conducted 2 experiments in which participants practiced either an action video game or a cognitive game in 5 separate, supervised sessions. Prior to each session and following the last session, participants performed a perceptual discrimination task. In the second experiment, we included a third condition in which no video games were played at all. Behavioral data and diffusion model parameters showed similar practice effects for the action gamers, the cognitive gamers, and the nongamers and suggest that, in contrast to earlier reports, playing action video games does not improve the speed of information processing in simple perceptual tasks. PMID:24933517

  3. Action video games do not improve the speed of information processing in simple perceptual tasks.

    PubMed

    van Ravenzwaaij, Don; Boekel, Wouter; Forstmann, Birte U; Ratcliff, Roger; Wagenmakers, Eric-Jan

    2014-10-01

    Previous research suggests that playing action video games improves performance on sensory, perceptual, and attentional tasks. For instance, Green, Pouget, and Bavelier (2010) used the diffusion model to decompose data from a motion detection task and estimate the contribution of several underlying psychological processes. Their analysis indicated that playing action video games leads to faster information processing, reduced response caution, and no difference in motor responding. Because perceptual learning is generally thought to be highly context-specific, this transfer from gaming is surprising and warrants corroborative evidence from a large-scale training study. We conducted 2 experiments in which participants practiced either an action video game or a cognitive game in 5 separate, supervised sessions. Prior to each session and following the last session, participants performed a perceptual discrimination task. In the second experiment, we included a third condition in which no video games were played at all. Behavioral data and diffusion model parameters showed similar practice effects for the action gamers, the cognitive gamers, and the nongamers and suggest that, in contrast to earlier reports, playing action video games does not improve the speed of information processing in simple perceptual tasks.

  4. Physical Point Simulation in 2+1 Flavor Lattice QCD

    SciTech Connect

    Aoki, S.; Ishikawa, K.; Ishizuka, N.; Izubuchi, T.; Kadoh, D.; Kanaya, K.; Kuramashi, Y.; Namekawa, Y.; Okawa, M.; Taniguchi, Y.; Ukawa, A.; Ukita, N.; Yamazaki, T.; Yoshie, T.

    2010-04-14

    We present the results of the physical point simulation in 2+1 flavor lattice QCD with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action at {beta} = 1.9 on a 32{sup 3} x 64 lattice. The physical quark masses together with the lattice spacing is determined with m{sub {pi}}, m{sub K} and m{sub {Omega}} as physical inputs. There are two key algorithmic ingredients to make possible the direct simulation at the physical point: One is the mass-preconditioned domain-decomposed HMC algorithm to reduce the computational cost. The other is the reweighting technique to adjust the hopping parameters exactly to the physical point. The physics results include the hadron spectrum, the quark masses and the pseudoscalar meson decay constants. The renormalization factors are nonperturbatively evaluated with the Schroedinger functional method. The results are compared with the previous ones obtained by the chiral extrapolation method.

  5. Mapping actions to improve access to medicines for mental disorders in low and middle income countries.

    PubMed

    Barbui, C; Dua, T; Kolappa, K; Saraceno, B; Saxena, S

    2017-10-01

    In recent years a number of intergovernmental initiatives have been activated in order to enhance the capacity of countries to improve access to essential medicines, particularly for mental disorders. In May 2013 the 66th World Health Assembly adopted the World Health Organization (WHO) Comprehensive Mental Health Action Plan 2013-2020, which builds upon the work of WHO's Mental Health Gap Action Programme. Within this programme, evidence-based guidelines for mental disorders were developed, including recommendations on appropriate use of medicines. Subsequently, the 67th World Health Assembly adopted a resolution on access to essential medicines, which urged Member States to improve national policies for the selection of essential medicines and to promote their availability, affordability and appropriate use. Following the precedent set by these important initiatives, this article presents eleven actions for improving access and appropriate use of psychotropic medicines. A 4 × 4 framework mapping actions as a function of the four components of access - selection, availability, affordability and appropriate use - and across four different health care levels, three of which belong to the supply side and one to the demand side, was developed. The actions are: developing a medicine selection process; promoting information and education activities for staff and end-users; developing a medicine regulation process; implementing a reliable supply system; implementing a reliable quality-control system; developing a community-based system of mental health care and promoting help-seeking behaviours; developing international agreements on medicine affordability; developing pricing policies and a sustainable financing system; developing or adopting evidence-based guidelines; monitoring the use of psychotropic medicines; promoting training initiatives for staff and end-users on critical appraisal of scientific evidence and appropriate use of psychotropic medicines. Activating

  6. Scotland's Knowledge Network: translating knowledge into action to improve quality of care.

    PubMed

    Wales, A; Graham, S; Rooney, K; Crawford, A

    2012-11-01

    The Knowledge Network (www.knowledge.scot.nhs.uk) is Scotland's online knowledge service for health and social care. It is designed to support practitioners to apply knowledge in frontline delivery of care, helping to translate knowledge into better health-care outcomes through safe, effective, person-centred care. The Knowledge Network helps to combine the worlds of evidence-based practice and quality improvement by providing access to knowledge about the effectiveness of clinical interventions ('know-what') and knowledge about how to implement this knowledge to support individual patients in working health-care environments ('know-how'). An 'evidence and guidance' search enables clinicians to quickly access quality-assured evidence and best practice, while point of care and mobile solutions provide knowledge in actionable formats to embed in clinical workflow. This research-based knowledge is complemented by social networking services and improvement tools which support the capture and exchange of knowledge from experience, facilitating practice change and systems improvement. In these cases, the Knowledge Network supports key components of the knowledge-to-action cycle--acquiring, creating, sharing and disseminating knowledge to improve performance and innovate. It provides a vehicle for implementing the recommendations of the national Knowledge into Action review, which outlines a new national approach to embedding knowledge in frontline practice and systems improvement.

  7. The Data-to-Action Framework: A Rapid Program Improvement Process.

    PubMed

    Zakocs, Ronda; Hill, Jessica A; Brown, Pamela; Wheaton, Jocelyn; Freire, Kimberley E

    2015-08-01

    Although health education programs may benefit from quality improvement methods, scant resources exist to help practitioners apply these methods for program improvement. The purpose of this article is to describe the Data-to-Action framework, a process that guides practitioners through rapid-feedback cycles in order to generate actionable data to improve implementation of ongoing programs. The framework was designed while implementing DELTA PREP, a 3-year project aimed at building the primary prevention capacities of statewide domestic violence coalitions. The authors describe the framework's main steps and provide a case example of a rapid-feedback cycle and several examples of rapid-feedback memos produced during the project period. The authors also discuss implications for health education evaluation and practice. © 2015 Society for Public Health Education.

  8. From talk to action: what performance improvement is really all about.

    PubMed

    Newmark, Jason

    2007-01-01

    In today's ever increasingly competitive healthcare environment, our customers are demanding more efficient, easily accessible, and high quality service, and we are being asked to do more and more with oftentimes limited resources. As such, continually evaluating our department's operations, identifying opportunities for improvement, and commencing upon improvement initiatives is essential for an organization, and an administrator, to be successful. This article presents a "call to action" for the initiation of on-going performonce improvement efforts, and provides an overview of sample tools and strategies necessary to both identify opportunities for improvement and develop effective strategies to accomplish them. In addition, best practices for obtaining substantial financial and customer satisfaction data, as well as specific tools to engage stakeholders (management, staff, physicians, and so on) in achieving performance improvement success, are discussed. For clarity, a case study focusing on successful improvement initiatives with a central scheduling office will be presented.

  9. MCNP Super Lattice Method for VHTR ORIGEN2.2 Nuclear Library Improvement Based on ENDF/B-VII

    SciTech Connect

    G. S. Chang; J. R. Parry

    2010-10-01

    The advanced Very High Temperature gas-cooled Reactor (VHTR) achieves simplification of safety through reliance on innovative features and passive systems. One of the VHTRs innovative features is the reliance on ceramic-coated fuel particles to retain the fission products under extreme accident conditions. The effect of the random fuel kernel distribution in the fuel prismatic block creates a double-heterogeneous lattice, which needs to be addressed through the use of the newly developed prismatic super Kernel-by-Kernel Fuel (KbKF) lattice model method. Based on the new ENDF/B-VII nuclear cross section evaluated data, the developed KbKF super lattice model was then used with MCNP to calculate the material isotopes neutron reaction rates, such as, (n,?); (n,n’); (n,2n’); (n,f); (n,p); (n,?). Then, the MCNP-calculated results are rearranged to generate a set of new libraries “VHTRXS.lib,” for the ORIGEN2.2 isotopes depletion and build-up analysis code. The libraries contain one group cross section data for the structural light elements, actinides, and fission products that can be applied in the VHTR related fuel burnup and material transmutation analysis codes. The efficiency and ease of use of the MCNP method to generate and update the ORIGEN2.2 one-group spectrum weighed cross section library for VHTR was demonstrated.

  10. Food and Nutritional Improvement Action of Communities in Japan: Lessons for the World.

    PubMed

    Ishikawa, Midori; Kusama, Kaoru; Shikanai, Saiko

    2015-01-01

    In Japan, the national health policy "Healthy Japan 21 (second term)" was introduced in 2013 to support prevention of lifestyle-related disease. Policy has also been recently revised on the promotion of nutrition education (shokuiku). Community-based food and nutrition actions were developed based on those policies and aimed to reinforce the linkages across the food chain, looking along its length "from field to food", including production, processing, preparation, eating and disposal. Local government is responsible for identifying the important food and nutritional problems, to devise and group effective actions on the basis of local health issues. The National Institute of Public Health (NIPH) is responsible for carrying out public health staff training on policy-based health issues. Training carried out by the NIPH, the Japan Dietetic Association and the Japan Public Health Association was designed to create an enabling environment for nutrition action. The community-based actions, including nutrition education and information, are carried out by several bodies, including local government, schools, facilities, volunteer groups, residents' associations, and commercial companies, to establish sustainable food systems promoting healthy diets. The community-empowering actions and effective cooperation are reported as good practice models in an annual white paper by the Cabinet Office. Japanese dieticians are expected to share their experiences of local nutrition improvement activities in Japan with international colleagues. Experience from elsewhere, including from Japanese dieticians working in developing countries, should also be applied on their return.

  11. Identifying strategies to improve diabetes care in Alberta, Canada, using the knowledge-to-action cycle

    PubMed Central

    Braun, Ted; Edwards, Alun; Grimshaw, Jeremy; Hemmelgarn, Brenda; Husereau, Don; Ivers, Noah; Johnson, Jeff; Long, Steve; McBrien, Kerry; Naugler, Christopher; Sargious, Peter; Straus, Sharon; Tonelli, Marcello; Tricco, Andrea C.; Yu, Catherine

    2013-01-01

    Background Strategic clinical networks, a recent development in the health system in Alberta, have been charged with bringing together front-line clinicians, researchers and policy-makers to identify variation in clinical care, and to propose standards, pathways and innovative solutions to improve access and quality of care. Here, we describe a collaborative workshop held between researchers and the Obesity, Diabetes and Nutrition Strategic Clinical Network to describe barriers to and facilitators of care for people with diabetes and to identify quality improvement interventions that should be prioritized. Methods Through collaboration between health researchers and the strategic clinical network, and using principles of the knowledge-to-action cycle, we identified barriers to and facilitators of diabetes care using data from a patient survey and a provider focus group (5 primary care physicians and 1 diabetes educator). In addition, we identified best evidence from a systematic review of quality improvement initiatives in diabetes. This information was reviewed at a multistakeholder workshop where potential quality improvement initiatives were considered at various service levels. Results A pilot survey involving 59 patients with diabetes and a focus group of primary care and allied health care providers identified several important barriers to optimal outcomes in diabetes care, including patient-level financial barriers to care and difficulty navigating the health system. Our collaborative discussion using the knowledge-to-action cycle prioritized feasible, evidence-based interventions to improve outcomes for patients with diabetes, including enabling care by allied health care providers and creating clear care maps and processes for system navigation. Interpretation We identified important barriers to achieving optimal outcomes in diabetes that may be overcome through the use of evidence-based quality improvement interventions. As recommended within the

  12. Improving Community-Based Mental Health Care for Children: Translating Knowledge into Action

    PubMed Central

    Haine-Schlagel, Rachel; Brookman-Frazee, Lauren; Baker-Ericzen, Mary; Trask, Emily; Fawley-King, Kya

    2013-01-01

    There is urgent need for improvement in community-based mental health care for children and families. Multiple studies have documented serious limitations in the effectiveness of “usual care.” Fortunately, many empirically-supported strategies to improve care have been developed, and thus there is now a great deal of knowledge available to address this significant public health problem. The goal of this selective review is to highlight and synthesize that empirically-supported knowledge to stimulate and facilitate the needed translation of knowledge into action. The review provides a sound foundation for constructing improved services by consolidating descriptive data on the status quo in children’s mental health care, as well as evidence for an array of promising strategies to improve (a) Service access and engagement; (b) Delivery of evidence-based practices; and (c) Outcome accountability. A multi-level framework is used to highlight recommended care improvement targets. PMID:23212902

  13. Instantons on the lattice

    NASA Astrophysics Data System (ADS)

    Fucito, F.; Solomon, S.

    By modifying the lattice action of spin and gauge models we insure that the system cannot tunnel between topological sectors by local Monte Carlo (MC) steps. We insure the correct weight of the topological sectors in the statistical sum by considering global MC steps. This strategy permits us to study the effects of topological objects in ϑ-vacua, < Q2> scaling and chiral symmetry breaking in a straightforward way.

  14. Entropy of a Taub-bolt-AdS spacetime from an improved action principle

    NASA Astrophysics Data System (ADS)

    Aros, Rodrigo

    2017-07-01

    In this article the study of four-dimensional spaces with NUT charges and their ground states is continued. In particular, through the introduction of an improved action principle containing topological densities, it is shown that these spaces have simple and sound thermodynamical relations. As an example, the entropy of the Taub-bolt-AdS solution is computed in terms of a Noether charge.

  15. Actions Needed to Improve the Reliability of Afghan Security Force Assessments

    DTIC Science & Technology

    2010-06-29

    Assessment Tool VTT Validation Transition Team SIGAR Audit-10-11 Security/ANSF Capability Ratings Page 1 Actions Needed to Improve the...the part of Afghan units. In addition, IJC’s Validation Transition Team ( VTT ), which provides independent validation of CM1 capabilities for the...personnel were present for duty in ANA-fielded combat units. The ANA’s manning shortage was confirmed in statements by VTT officials who reported

  16. Implementing solutions to improve and expand telehealth adoption: participatory action research in four community healthcare settings.

    PubMed

    Taylor, Johanna; Coates, Elizabeth; Wessels, Bridgette; Mountain, Gail; Hawley, Mark S

    2015-12-01

    Adoption of telehealth has been slower than anticipated, and little is known about the service improvements that help to embed telehealth into routine practice or the role of frontline staff in improving adoption. This paper reports on participatory action research carried out in four community health settings using telehealth for patients with Chronic Obstructive Pulmonary Disease and Chronic Heart Failure. To inform the action research, in-depth case studies of each telehealth service were conducted (May 2012-June 2013). Each service was then supported by researchers through two cycles of action research to implement changes to increase adoption of telehealth, completed over a seven month period (July 2013-April 2014). The action research was studied via observation of multi-stakeholder workshops, analysis of implementation plans, and focus groups. Action research participants included 57 staff and one patient, with between eight and 20 participants per site. The case study findings were identified as a key source of information for planning change, with sites addressing common challenges identified through this work. For example, refining referral criteria; standardizing how and when patients are monitored; improving data sharing; and establishing evaluation processes. Sites also focused on raising awareness of telehealth to increase adoption in other clinical teams and to help secure future financial investment for telehealth, which was required because of short-term funding arrangements. Specific solutions varied due to local infrastructures, resources, and opinion, as well as previous service developments. Local telehealth champions played an important role in engaging multiple stakeholders in the study. Action research enabled services to make planned changes to telehealth and share learning across multiple stakeholders about how and when to use telehealth. However, adoption was impeded by continual changes affecting telehealth and wider service provision

  17. Measuring the aspect ratio renormalization of anisotropic-lattice gluons

    SciTech Connect

    Alford, M.; Drummond, I. T.; Horgan, R. R.; Shanahan, H.; Peardon, M.

    2001-04-01

    Using tadpole-improved actions we investigate the consistency between different methods of measuring the aspect ratio renormalization of anisotropic-lattice gluons for bare aspect ratios {chi}{sub 0}=4,6,10 and inverse lattice spacing in the range a{sub s}{sup -1}=660--840 MeV. The tadpole corrections to the action, which are established self-consistently, are defined for two cases, mean link tadpoles in the Landau gauge and gauge invariant mean plaquette tadpoles. Parameters in the latter case exhibited no dependence on the spatial lattice size L, while in the former, parameters showed only a weak dependence on L easily extrapolated to L={infinity}. The renormalized anisotropy {chi}{sub R} was measured using both the torelon dispersion relation and the sideways potential method. There is general agreement between these approaches, but there are discrepancies which are evidence for the presence of lattice artifact contributions. For the torelon these are estimated to be O({alpha}{sub S}a{sub s}{sup 2}/R{sup 2}), where R is the flux-tube radius. We also present some new data that suggest that rotational invariance is established more accurately for the mean-link action than the plaquette action.

  18. An improved pore-network model including viscous coupling effects using direct simulation by the lattice Boltzmann method

    NASA Astrophysics Data System (ADS)

    Xie, Chiyu; Raeini, Ali Q.; Wang, Yihang; Blunt, Martin J.; Wang, Moran

    2017-02-01

    Viscous coupling during simultaneous flow of different fluid phases has a significant impact on their flow through porous media. In this work, a new multiscale strategy is proposed for multiphase flow in porous media. We use the lattice Boltzmann method (LBM) to simulate two-phase flow at pore scale and obtain empirical terms for the viscous coupling inside individual pores. The empirical coupling terms are then used in a pore-network model to efficiently simulate two-phase flow through porous media at core scale. It is shown that including viscous coupling leads to better predictions of relative permeability.

  19. Radiative Transitions in Charmonium from Lattice QCD

    SciTech Connect

    Jozef Dudek; Robert Edwards; David Richards

    2006-01-17

    Radiative transitions between charmonium states offer an insight into the internal structure of heavy-quark bound states within QCD. We compute, for the first time within lattice QCD, the transition form-factors of various multipolarities between the lightest few charmonium states. In addition, we compute the experimentally unobservable, but physically interesting vector form-factors of the {eta}{sub c}, J/{psi} and {chi}{sub c0}. To this end we apply an ambitious combination of lattice techniques, computing three-point functions with heavy domain wall fermions on an anisotropic lattice within the quenched approximation. With an anisotropy {xi} = 3 at a{sub s} {approx} 0.1 fm we find a reasonable gross spectrum and a hyperfine splitting {approx}90 MeV, which compares favorably with other improved actions. In general, after extrapolation of lattice data at non-zero Q{sup 2} to the photopoint, our results agree within errors with all well measured experimental values. Furthermore, results are compared with the expectations of simple quark models where we find that many features are in agreement; beyond this we propose the possibility of constraining such models using our extracted values of physically unobservable quantities such as the J/{psi} quadrupole moment. We conclude that our methods are successful and propose to apply them to the problem of radiative transitions involving hybrid mesons, with the eventual goal of predicting hybrid meson photoproduction rates at the GlueX experiment.

  20. 25 CFR 30.122 - Must the Bureau assist a school it identified for school improvement, corrective action, or...

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 25 Indians 1 2013-04-01 2013-04-01 false Must the Bureau assist a school it identified for school improvement, corrective action, or restructuring? 30.122 Section 30.122 Indians BUREAU OF INDIAN AFFAIRS....122 Must the Bureau assist a school it identified for school improvement, corrective action,...

  1. 25 CFR 30.122 - Must the Bureau assist a school it identified for school improvement, corrective action, or...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ....122 Must the Bureau assist a school it identified for school improvement, corrective action, or restructuring? Yes, if a Bureau-funded school is identified for school improvement, corrective action, or... 25 Indians 1 2010-04-01 2010-04-01 false Must the Bureau assist a school it identified for...

  2. Uranium Mill Tailings Remedial Action Project: Cost Reduction and Productivity Improvement Program Project Plan. Revised

    SciTech Connect

    Not Available

    1991-11-01

    The purpose of the Cost Reduction/Productivity Improvement Program Plan is to formalize and improve upon existing efforts to control costs which have been underway since project inception. This program plan has been coordinated with the Department of Energy (DOE) Office of Environmental Management (EM) and the DOE Field Office, Albuquerque (AL). It incorporates prior Uranium Mill Tallings Remedial Action (UMTRA) Project Office guidance issued on the subject. The opportunities for reducing cosh and improving productivity are endless. The CR/PIP has these primary objectives: Improve productivity and quality; heighten the general cost consciousness of project participants, at all levels of their organizations; identify and implement specific innovative employee ideas that extend beyond what is required through existing processes and procedures; emphasize efforts that create additional value for the money spent by maintaining the project Total Estimated Cost (TEC) at the lowest possible level.

  3. Uranium Mill Tailings Remedial Action Project: Cost Reduction and Productivity Improvement Program Project Plan

    SciTech Connect

    Not Available

    1991-11-01

    The purpose of the Cost Reduction/Productivity Improvement Program Plan is to formalize and improve upon existing efforts to control costs which have been underway since project inception. This program plan has been coordinated with the Department of Energy (DOE) Office of Environmental Management (EM) and the DOE Field Office, Albuquerque (AL). It incorporates prior Uranium Mill Tallings Remedial Action (UMTRA) Project Office guidance issued on the subject. The opportunities for reducing cosh and improving productivity are endless. The CR/PIP has these primary objectives: Improve productivity and quality; heighten the general cost consciousness of project participants, at all levels of their organizations; identify and implement specific innovative employee ideas that extend beyond what is required through existing processes and procedures; emphasize efforts that create additional value for the money spent by maintaining the project Total Estimated Cost (TEC) at the lowest possible level.

  4. Lattice QCD in rotating frames.

    PubMed

    Yamamoto, Arata; Hirono, Yuji

    2013-08-23

    We formulate lattice QCD in rotating frames to study the physics of QCD matter under rotation. We construct the lattice QCD action with the rotational metric and apply it to the Monte Carlo simulation. As the first application, we calculate the angular momenta of gluons and quarks in the rotating QCD vacuum. This new framework is useful to analyze various rotation-related phenomena in QCD.

  5. Protein folding optimization based on 3D off-lattice model via an improved artificial bee colony algorithm.

    PubMed

    Li, Bai; Lin, Mu; Liu, Qiao; Li, Ya; Zhou, Changjun

    2015-10-01

    Protein folding is a fundamental topic in molecular biology. Conventional experimental techniques for protein structure identification or protein folding recognition require strict laboratory requirements and heavy operating burdens, which have largely limited their applications. Alternatively, computer-aided techniques have been developed to optimize protein structures or to predict the protein folding process. In this paper, we utilize a 3D off-lattice model to describe the original protein folding scheme as a simplified energy-optimal numerical problem, where all types of amino acid residues are binarized into hydrophobic and hydrophilic ones. We apply a balance-evolution artificial bee colony (BE-ABC) algorithm as the minimization solver, which is featured by the adaptive adjustment of search intensity to cater for the varying needs during the entire optimization process. In this work, we establish a benchmark case set with 13 real protein sequences from the Protein Data Bank database and evaluate the convergence performance of BE-ABC algorithm through strict comparisons with several state-of-the-art ABC variants in short-term numerical experiments. Besides that, our obtained best-so-far protein structures are compared to the ones in comprehensive previous literature. This study also provides preliminary insights into how artificial intelligence techniques can be applied to reveal the dynamics of protein folding. Graphical Abstract Protein folding optimization using 3D off-lattice model and advanced optimization techniques.

  6. Feedback about previous action improves executive functioning in schizophrenia: An analysis of maze solving behaviour.

    PubMed

    Lis, Stefanie; Krieger, Stephan; Wilhelm, Johannes; Gallhofer, Bernd

    2005-10-15

    Disturbances of executive functions (EF) in schizophrenia have received special attention during the past years, but there is still an ongoing debate whether impairment in EF tasks can be linked to deficits of EF themselves or if they rather reflect impairment of other cognitive functions such as working memory processes that are additionally required for task solving. In the present study, we analyzed whether impairments in the maintenance of previous processing assumed to be related to working memory contribute to the impairments in EF tasks seen in schizophrenia. Twenty-five schizophrenic patients treated with atypical antipsychotic agents and 25 healthy controls matched according to age, sex, and education were instructed to solve novel two-dimensional maze tasks by steering a pen through a system of paths. Low demands on maintaining previous actions by giving feedback on preceding movements (visualising the trace of the pen) were contrasted with high demands, i.e. without such a trace of past processing. Without feedback of previous action, task solution was less successful and the control of motor action was deficient in schizophrenic patients. With feedback, both domains of behaviour improved to the level of healthy controls at the costs of higher time demands. The behaviour of healthy controls was not influenced by the experimental manipulation. Lower demands on the maintenance of previous action seem to enable schizophrenic patients to perform executive functions successfully. But data suggest that task solving of schizophrenic patients is characterized by alterations in the coordination of executive functions with other cognitive processes.

  7. How could health information be improved? Recommended actions from the Victorian Consultation on Health Literacy.

    PubMed

    Hill, Sophie J; Sofra, Tanya A

    2017-03-07

    Objective Health literacy is on the policy agenda. Accessible, high-quality health information is a major component of health literacy. Health information materials include print, electronic or other media-based information enabling people to understand health and make health-related decisions. The aim of the present study was to present the findings and recommended actions as they relate to health information of the Victorian Consultation on Health Literacy.Methods Notes and submissions from the 2014 Victorian Consultation workshops and submissions were analysed thematically and a report prepared with input from an advisory committee.Results Health information needs to improve and recommendations are grouped into two overarching themes. First, the quality of information needs to be increased and this can be done by developing a principle-based framework to inform updating guidance for information production, formulating standards to raise quality and improving the systems for delivering information to people. Second, there needs to be a focus on users of health information. Recommendation actions were for information that promoted active participation in health encounters, resources to encourage critical users of health information and increased availability of information tailored to population diversity.Conclusion A framework to improve health information would underpin the efforts to meet literacy needs in a more consistent way, improving standards and ultimately increasing the participation by consumers and carers in health decision making and self-management.What is known about the topic? Health information is a critical component of the concept of health literacy. Poorer health literacy is associated with poorer health outcomes across a range of measures. Improving access to and the use of quality sources of health information is an important strategy for meeting the health literacy needs of the population. In recent years, health services and governments

  8. Action video games and improved attentional control: Disentangling selection- and response-based processes.

    PubMed

    Chisholm, Joseph D; Kingstone, Alan

    2015-10-01

    Research has demonstrated that experience with action video games is associated with improvements in a host of cognitive tasks. Evidence from paradigms that assess aspects of attention has suggested that action video game players (AVGPs) possess greater control over the allocation of attentional resources than do non-video-game players (NVGPs). Using a compound search task that teased apart selection- and response-based processes (Duncan, 1985), we required participants to perform an oculomotor capture task in which they made saccades to a uniquely colored target (selection-based process) and then produced a manual directional response based on information within the target (response-based process). We replicated the finding that AVGPs are less susceptible to attentional distraction and, critically, revealed that AVGPs outperform NVGPs on both selection-based and response-based processes. These results not only are consistent with the improved-attentional-control account of AVGP benefits, but they suggest that the benefit of action video game playing extends across the full breadth of attention-mediated stimulus-response processes that impact human performance.

  9. Improving the accuracy of admitted subacute clinical costing: an action research approach.

    PubMed

    Hakkennes, Sharon; Arblaster, Ross; Lim, Kim

    2016-08-29

    Objective The aim of the present study was to determine whether action research could be used to improve the breadth and accuracy of clinical costing data in an admitted subacute settingMethods The setting was a 100-bed in-patient rehabilitation centre. Using a pre-post study design all admitted subacute separations during the 2011-12 financial year were eligible for inclusion. An action research framework aimed at improving clinical costing methodology was developed and implemented.Results In all, 1499 separations were included in the study. A medical record audit of a random selection of 80 separations demonstrated that the use of an action research framework was effective in improving the breadth and accuracy of the costing data. This was evidenced by a significant increase in the average number of activities costed, a reduction in the average number of activities incorrectly costed and a reduction in the average number of activities missing from the costing, per episode of care.Conclusions Engaging clinicians and cost centre managers was effective in facilitating the development of robust clinical costing data in an admitted subacute setting. Further investigation into the value of this approach across other care types and healthcare services is warranted.What is known about this topic? Accurate clinical costing data is essential for informing price models used in activity-based funding. In Australia, there is currently a lack of robust admitted subacute cost data to inform the price model for this care type.What does this paper add? The action research framework presented in this study was effective in improving the breadth and accuracy of clinical costing data in an admitted subacute setting.What are the implications for practitioners? To improve clinical costing practices, health services should consider engaging key stakeholders, including clinicians and cost centre managers, in reviewing clinical costing methodology. Robust clinical costing data has the

  10. Lattice overview

    SciTech Connect

    Creutz, M.

    1984-01-01

    After reviewing some recent developments in supercomputer access, the author discusses a few areas where perturbation theory and lattice gauge simulations make contact. The author concludes with a brief discussion of a deterministic dynamics for the Ising model. This may be useful for numerical studies of nonequilibrium phenomena. 13 references.

  11. Action plans for COPD: strategies to manage exacerbations and improve outcomes.

    PubMed

    Jalota, Leena; Jain, Vipul V

    2016-01-01

    COPD is the third-largest killer in the world, and certainly takes a toll on the health care system. Recurrent COPD exacerbations accelerate lung-function decline, worsen mortality, and consume over US$50 billion in health care spending annually. This has led to a tide of payment reforms eliciting interest in strategies reducing preventable COPD exacerbations. In this review, we analyze and discuss the evidence for COPD action plan-based self-management strategies. Although action plans may provide stabilization of acute symptomatology, there are several limitations. These include patient-centered attributes, such as comprehension and adherence, and nonadherence of health care providers to established guidelines. While no single intervention can be expected independently to translate into improved outcomes, structured together within a comprehensive integrated disease-management program, they may provide a robust paradigm.

  12. Linear response theory for symmetry improved two particle irreducible effective actions

    NASA Astrophysics Data System (ADS)

    Brown, Michael J.; Whittingham, Ian B.; Kosov, Daniel S.

    2016-05-01

    We investigate the linear response of an O (N ) scalar quantum field theory subject to external perturbations using the symmetry-improved two-particle irreducible effective action (SI-2PIEA) formalism [A. Pilaftsis and D. Teresi, Nucl. Phys. B874, 594 (2013)]. Despite satisfactory equilibrium behavior, we find a number of unphysical effects at the linear response level. Goldstone boson field fluctuations are overdetermined, with the only consistent solution being to set the fluctuations and their driving sources to zero, except for momentum modes where the Higgs and Goldstone self-energies obey a particular relationship. Also Higgs field fluctuations propagate masslessly, despite the Higgs propagator having the correct mass. These pathologies are independent of any truncation of the effective action and still exist even if we relax the overdetermining Ward identities, so long as the constraint is formulated O (N ) covariantly. We discuss possible reasons for the apparent incompatibility of the constraints and linear response approximation and possible ways forward.

  13. Mitochondria-targeted liposomes improve the apoptotic and cytotoxic action of sclareol.

    PubMed

    Patel, Niravkumar R; Hatziantoniou, Sophia; Georgopoulos, Aristidis; Demetzos, Costas; Torchilin, Vladimir P; Weissig, Volkmar; D'Souza, Gerard G M

    2010-09-01

    Current efforts toward improving the effectiveness of drug therapy are increasingly relying on drug-targeting strategies to effectively deliver bioactive molecules to their molecular targets. Pharmaceutical nanocarriers represent a major tool toward this aim, and our efforts have been directed toward achieving nanocarrier-mediated subcellular delivery of drug molecules with mitochondria as the primary subcellular target. Meeting the need for specific subcellular delivery is essential to realizing the full potential of many poorly soluble anticancer drugs. In this article, we report that mitochondria-targeted liposomes significantly improve the apoptotic and cytotoxic action of sclareol, a poorly soluble potential anticancer drug. The results support the broad applicability of our nanocarrier-mediated subcellular targeting approach as a means to improve the effectiveness of certain anticancer therapeutics.

  14. Improving Nutritional Health of the Public through Social Change: Finding Our Roles in Collective Action.

    PubMed

    Raine, Kim D

    2014-09-01

    Improving the nutritional health of the public continues to be a major challenge. Our mission of advancing health through food and nutrition has become increasingly complex, particularly as food environments shape the availability, affordability, and social acceptability of food and nutrition "choices". Promoting nutritional health requires that dietitians expand our knowledge in understanding the determinants of healthy eating and of social change strategies that advocates for and acts on improving food environments. While no single strategy can solve the challenges of public health nutrition, we can each identify unique strengths and opportunities. If we practice in complementary ways, using those strengths for collective action will make us stronger together toward social change supporting improved nutritional health of the public.

  15. Accelerating the development of improved analgesic treatments: the ACTION public-private partnership.

    PubMed

    Dworkin, Robert H; Turk, Dennis C

    2011-07-01

    There has been considerable progress identifying pathophysiologic mechanisms of neuropathic pain, but analgesic medications with improved efficacy, safety, and tolerability still represent an unmet public health need. Numerous treatments examined in recent randomized clinical trials (RCTs) have failed to show efficacy for neuropathic pain, including treatments that had previously demonstrated efficacy. This suggests that at least some negative results reflect limited assay sensitivity of RCTs to distinguish efficacious treatments from placebo. Patient characteristics, clinical trial research designs and methods, outcome measures, approaches to data analysis, and statistical power may all play a role in accounting for difficulties in demonstrating the benefits of efficacious analgesic treatments vs placebo. The identification of specific clinical trial characteristics associated with assay sensitivity in existing data has the potential to provide an evidence-based approach to the design of analgesic clinical trials. The US Food and Drug Administration recently launched the Analgesic Clinical Trial Innovations, Opportunities, and Networks (ACTION) public-private partnership, which is designed to facilitate the discovery and development of analgesics with improved efficacy, safety, and tolerability for acute and chronic pain conditions. ACTION will establish a collaborative effort to prioritize research objectives, develop a standardized analgesic database platform, and conduct methodologically focused studies to increase the assay sensitivity and efficiency of analgesic clinical trials. The results of these activities have the potential to inform and accelerate the development of improved pain management interventions of all types, not just pharmacologic treatments.

  16. Motor performance may be improved by kinesthetic imagery, specific action verb production, and mental calculation.

    PubMed

    Rabahi, Tahar; Fargier, Patrick; Rifai-Sarraj, Ahmad; Clouzeau, Cyril; Massarelli, Raphael

    2012-01-25

    Several results in the literature show that motor imagery, language production, mental calculation, and motor execution share the same or closely related brain motor cortical areas. The present study aimed at investigating the possible influence of specific action verb (AV) pronunciation and mental calculus upon motor performance compared with kinesthetic imagery (KI). Participants, novice in mental imagery, performed a vertical jump after a cognitive task (AV, silent AV, mental subtraction, meaningless verb, and KI). The results show that specific lower limbs AV, mental calculation, and KI improved the vertical jump in male, but not in female participants. © 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins.

  17. Sense of agency in continuous action: Assistance-induced performance improvement is self-attributed even with knowledge of assistance.

    PubMed

    Inoue, Kazuya; Takeda, Yuji; Kimura, Motohiro

    2017-02-01

    In a task involving continuous action to achieve a goal, the sense of agency increases with an improvement in task performance that is induced by unnoticed computer assistance. This study investigated how explicit instruction about the existence of computer assistance affects the increase of sense of agency that accompanies performance improvement. Participants performed a continuous action task in which they controlled the direction of motion of a dot to a goal by pressing keys. When instructions indicated the absence of assistance, the sense of agency increased with performance improvement induced by computer assistance, replicating previous findings. Interestingly, this increase of sense of agency was also observed even when instructions indicated the presence of assistance. These results suggest that even when a plausible cause of performance improvement other than one's own action exists, the improvement can be misattributed to one's own control of action, resulting in an increased sense of agency.

  18. Learning Action Research and Managing Educational Change-Improvement in Careers Education: A Case Study of Managerialism in Action?

    ERIC Educational Resources Information Center

    Hutchinson, Barry

    1998-01-01

    Asks why so few prospective teachers, on completing their studies (extolling action research), continue to use this approach in their subsequent practice. Drawing upon Esland's notion of "managerialism" and employing an indepth case study of Gerard, a recent graduate, concludes that marketing pressures have taken priority over core…

  19. Lattice fermions

    NASA Technical Reports Server (NTRS)

    Wilczek, Frank

    1987-01-01

    A simple heuristic proof of the Nielsen-Ninomaya theorem is given. A method is proposed whereby the multiplication of fermion species on a lattice is reduced to the minimal doubling, in any dimension, with retention of appropriate chiral symmetries. Also, it is suggested that use of spatially thinned fermion fields is likely to be a useful and appropriate approximation in QCD - in any case, it is a self-checking one.

  20. Cascaded lattice Boltzmann method with improved forcing scheme for large-density-ratio multiphase flow at high Reynolds and Weber numbers

    NASA Astrophysics Data System (ADS)

    Lycett-Brown, Daniel; Luo, Kai H.

    2016-11-01

    A recently developed forcing scheme has allowed the pseudopotential multiphase lattice Boltzmann method to correctly reproduce coexistence curves, while expanding its range to lower surface tensions and arbitrarily high density ratios [Lycett-Brown and Luo, Phys. Rev. E 91, 023305 (2015), 10.1103/PhysRevE.91.023305]. Here, a third-order Chapman-Enskog analysis is used to extend this result from the single-relaxation-time collision operator, to a multiple-relaxation-time cascaded collision operator, whose additional relaxation rates allow a significant increase in stability. Numerical results confirm that the proposed scheme enables almost independent control of density ratio, surface tension, interface width, viscosity, and the additional relaxation rates of the cascaded collision operator. This allows simulation of large density ratio flows at simultaneously high Reynolds and Weber numbers, which is demonstrated through binary collisions of water droplets in air (with density ratio up to 1000, Reynolds number 6200 and Weber number 440). This model represents a significant improvement in multiphase flow simulation by the pseudopotential lattice Boltzmann method in which real-world parameters are finally achievable.

  1. Cascaded lattice Boltzmann method with improved forcing scheme for large-density-ratio multiphase flow at high Reynolds and Weber numbers.

    PubMed

    Lycett-Brown, Daniel; Luo, Kai H

    2016-11-01

    A recently developed forcing scheme has allowed the pseudopotential multiphase lattice Boltzmann method to correctly reproduce coexistence curves, while expanding its range to lower surface tensions and arbitrarily high density ratios [Lycett-Brown and Luo, Phys. Rev. E 91, 023305 (2015)PLEEE81539-375510.1103/PhysRevE.91.023305]. Here, a third-order Chapman-Enskog analysis is used to extend this result from the single-relaxation-time collision operator, to a multiple-relaxation-time cascaded collision operator, whose additional relaxation rates allow a significant increase in stability. Numerical results confirm that the proposed scheme enables almost independent control of density ratio, surface tension, interface width, viscosity, and the additional relaxation rates of the cascaded collision operator. This allows simulation of large density ratio flows at simultaneously high Reynolds and Weber numbers, which is demonstrated through binary collisions of water droplets in air (with density ratio up to 1000, Reynolds number 6200 and Weber number 440). This model represents a significant improvement in multiphase flow simulation by the pseudopotential lattice Boltzmann method in which real-world parameters are finally achievable.

  2. From Fantasy to Action: Mental Contrasting with Implementation Intentions (MCII) Improves Academic Performance in Children

    PubMed Central

    Duckworth, Angela Lee; Kirby, Teri; Gollwitzer, Anton; Oettingen, Gabriele

    2013-01-01

    The current intervention tested whether a metacognitive self-regulatory strategy of goal pursuit can help economically disadvantaged children convert positive thoughts and images about their future into effective action. Mental contrasting with implementation intentions (MCII) entails mental contrasting a desired future with relevant obstacles of reality and forming implementation intentions (if-then plans) specifying when and where to overcome those obstacles. Seventy-seven fifth graders from an urban middle school were randomly assigned to learn either MCII or a Positive Thinking control strategy. Compared to children in the control condition, children taught how to apply MCII to their academic wishes and concerns significantly improved their report card grades (η2 = .07), attendance (η2 = .05), and conduct (η2 = .07). These findings suggest that MCII holds considerable promise for helping disadvantaged middle school children improve their academic performance. PMID:25068007

  3. Absence of evidence for pentaquarks on the lattice

    SciTech Connect

    Holland, Kieran; Juge, K. Jimmy

    2006-04-01

    We study the question of whether or not QCD predicts a pentaquark state {theta}{sup +}. We use the improved, fixed point lattice QCD action which has very little sensitivity to the lattice spacing and also allows us to reach light quark masses. The analysis was performed on a single volume of size (1.8 fm){sup 3}x3.6 fm with lattice spacing of a=0.102 fm. We use the correlation matrix method to identify the ground and excited states in the isospin 0, negative parity channel. In the quenched approximation where dynamical quark effects are omitted, we do not find any evidence for a pentaquark resonance in QCD.

  4. Action Research as another Literacy Skill To Improve Academic Performance: A Case Study of Empowered Language Learning

    ERIC Educational Resources Information Center

    Ariizumi, Yoshihiko

    2006-01-01

    Background: Even though action research has been employed in an increasing number of fields of practice including teaching, nursing, and business, application in learning has been scarcely reported. This case study is one of the first attempts to apply action research principles to help learners improve their learning performance. Purpose: This…

  5. Analysis of the lattice Boltzmann Bhatnagar-Gross-Krook no-slip boundary condition: Ways to improve accuracy and stability

    NASA Astrophysics Data System (ADS)

    Verschaeve, Joris C. G.

    2009-09-01

    An analytical and numerical analysis of the no-slip boundary condition at walls at rest for the lattice Boltzmann Bhatnagar-Gross-Krook method is performed. The main result of this analysis is an alternative formulation for the no-slip boundary condition at walls at rest. Numerical experiments assess the accuracy and stability of this formulation for Poiseuille and Womersley flows, flow over a backward facing step, and unsteady flow around a square cylinder. This no-slip boundary condition is compared analytically and numerically to the boundary conditions of Inamuro [Phys. Fluids 7, 2928 (1995)] and Zou and He [Phys. Fluids 9, 1591 (1997)] and it is found that all three make use of the same mechanism for the off-diagonal element of the stress tensor. Mass conservation, however, is only assured by the present one. In addition, our analysis points out which mechanism lies behind the instabilities also observed by Lätt [Phys. Rev. E 77, 056703 (2008)] for this kind of boundary conditions. We present a way to remove these instabilities, allowing one to reach relaxation frequencies considerably closer to 2.

  6. Form Factors for $B$ to $Kll$ Semileptonic Decay from Three-Flavor Lattice QCD

    SciTech Connect

    Zhou, Ran; Bailey, Jon A.; Bazavov, Alexei; El-Khadra, Aida X.; Gottlieb, Steven; Jain, Rajendra D.; Kronfeld, Andreas S.; Van de Water, Ruth S.; /Brookhaven

    2011-11-01

    We study the B {yields} Kl{sup +}l{sup -} semileptonic decay process in three-flavor lattice QCD. We analyze several ensembles generated by theMILC collaboration at different lattice spacings and sea-quark masses. We use the asqtad improved staggered action for the light quarks and the clover action with the Fermilab interpretation for the heavy b quark. We present preliminary results for the vector current induced form factors for a range of kaon energies. Our analysis includes chiral and continuum extrapolations based on SU(2) staggered {chi}PT.

  7. Development of a mental health action checklist for improving workplace environment as means of job stress prevention.

    PubMed

    Yoshikawa, Toru; Kawakami, Norito; Kogi, Kazutaka; Tsutsumi, Akizumi; Shimazu, Miyuki; Nagami, Makiko; Shimazu, Akihito

    2007-07-01

    An action checklist for improving the workplace environment by means of enhancing mental health of workers (Mental Health Action Check List: MHACL) was developed. The use of the checklist for primary prevention was examined. MHACL was developed through three steps: (1) Review of related references and collection of improvement examples for designing a draft MHACL; (2) pilot application of the draft at industrial workplaces and trials at workshops of occupational health staff; and (3) proposing a new MHACL for general use in industry. Workplace improvement actions related to mental health were listed in eight technical areas. From 84 workplaces in Japan, 201 such actions were collected. Typical improvement action phrases were extracted based on these examples, and a draft MHACL containing 40 generally applicable actions were prepared. This draft was applied to selected workplaces for its use as a tool for group discussion. Then, the utility of the checklist was discussed by 105 occupational health staff working in public service offices. The workshop suggested modifications of the draft MHACL including improved check items and usage procedures and the need to use easy-to-understand actions. The final version of the MHACL comprised 30 items in six technical areas: A) sharing work planning, B) work time and organization, C) ergonomic work methods, D) workplace environment, E) mutual support in the workplace, and F) preparedness and care. A new action checklist was proposed for use as a means of changing existing workplace environments and proposing practical actions for improving it. The checklist was confirmed to be useful for organizing workplace-level discussion for identifying immediate improvements at the workplace. The checklist is expected to be widely applied for promoting primary prevention measures in terms of better mental health.

  8. {rho} meson decay in 2+1 flavor lattice QCD

    SciTech Connect

    Aoki, S.; Ishizuka, N.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.; Ishikawa, K-I.; Okawa, M.; Kanaya, K.; Kuramashi, Y.; Namekawa, Y.; Ukita, N.; Yamazaki, T.

    2011-11-01

    We perform a lattice QCD study of the {rho} meson decay from the N{sub f}=2+1 full QCD configurations generated with a renormalization group improved gauge action and a nonperturbatively O(a)-improved Wilson fermion action. The resonance parameters, the effective {rho}{yields}{pi}{pi} coupling constant and the resonance mass, are estimated from the P-wave scattering phase shift for the isospin I=1 two-pion system. The finite size formulas are employed to calculate the phase shift from the energy on the lattice. Our calculations are carried out at two quark masses, m{sub {pi}=}410 MeV (m{sub {pi}/}m{sub {rho}=}0.46) and m{sub {pi}=}300 MeV (m{sub {pi}/}m{sub {rho}=}0.35), on a 32{sup 3}x64 (La=2.9 fm) lattice at the lattice spacing a=0.091 fm. We compare our results at these two quark masses with those given in the previous works using N{sub f}=2 full QCD configurations and the experiment.

  9. Manipulation of the crystal structure defects: An alternative route to the reduction in lattice thermal conductivity and improvement in thermoelectric performance of CuGaTe2

    NASA Astrophysics Data System (ADS)

    Wu, Wenchang; Li, Yapeng; Du, Zhengliang; Meng, Qingsen; Sun, Zheng; Ren, Wei; Cui, Jiaolin

    2013-07-01

    Here, we present the manipulation of the crystal structure defects: an alternative route to reduce the lattice thermal conductivity (κL) on an atomic scale and improve the thermoelectric performance of CuGaTe2. This semiconductor with defects, represented by anion position displacement (u) and tetragonal deformation (η), generally gives low κL values when u and η distinctly deviate from 0.25 and 1 in the ideal zinc-blende structure, respectively. However, this semiconductor will show high Seebeck coefficients and low electrical conductivities when u and η are close to 0.25 and 1, respectively, due to the electrical inactivity caused by an attractive interaction between donor-acceptor defect pairs (GaCu2+ + 2VCu-).

  10. Low energy determination of the QCD strong coupling constant on the lattice

    SciTech Connect

    Maezawa, Yu; Petreczky, Peter

    2016-09-28

    Here we present a determination of the strong coupling constant from lattice QCD using the moments of pseudo-scalar charmonium correlators calculated using highly improved staggerered quark action. We obtain a value αs( μ = mc) = 0.3397(56), which is the lowest energy determination of the strong coupling constant so far.

  11. Low energy determination of the QCD strong coupling constant on the lattice

    DOE PAGES

    Maezawa, Yu; Petreczky, Peter

    2016-09-28

    Here we present a determination of the strong coupling constant from lattice QCD using the moments of pseudo-scalar charmonium correlators calculated using highly improved staggerered quark action. We obtain a value αs( μ = mc) = 0.3397(56), which is the lowest energy determination of the strong coupling constant so far.

  12. Taking Action With Data: Improving Environmental Public Health at the Community Level.

    PubMed

    Camponeschi, Jenny; Vogt, Christy M; Creswell, Paul D; Mueller, Meridith; Christenson, Megan; Werner, Mark A

    The Wisconsin Environmental Public Health Tracking Program (Wisconsin Tracking) compiles and provides data on health endpoints and related environmental exposures as a resource to local health departments, tribes, academia, and other stakeholders. The goal of providing these data is that stakeholders use them to develop projects that improve environmental health in their communities-that is, moving from "data to action." To encourage use of Wisconsin Tracking data, we developed a minigrants program and issued a funding opportunity to local health departments and tribes. The opportunity requested proposals for small projects using our data, with the goal of making public health improvements in those communities. Wisconsin Tracking evaluated the minigrants program after its completion. Eight local health departments in Wisconsin were awarded up to $10 500 to develop and implement projects over a 9-month period. Wisconsin Tracking created a funding opportunity announcement requiring utilization of our data to develop projects by local health departments in Wisconsin. We reviewed and scored applications, evaluating proposals on a range of criteria. During the 9-month project period, Wisconsin Tracking staff members provided a variety of technical assistance to grantees. An evaluation of the overall program followed. Funded communities used Wisconsin Tracking data to improve public health infrastructure, leverage partnerships, establish new initiatives, respond to emergencies, improve communication with stakeholders and residents, and make a variety of public health improvements in their communities. Efforts to increase use of our data catalyzed development of small-scale environmental health projects. This minigrants program was successful at building relationships between local health departments and Wisconsin Tracking, increasing awareness of Wisconsin Tracking data and resources, and contributing to numerous documented public health improvements throughout Wisconsin.

  13. Action observation treatment improves recovery of postsurgical orthopedic patients: evidence for a top-down effect?

    PubMed

    Bellelli, Giuseppe; Buccino, Giovanni; Bernardini, Bruno; Padovani, Alessandro; Trabucchi, Marco

    2010-10-01

    To assess whether action observation treatment (AOT) may also improve motor recovery in postsurgical orthopedic patients, in addition to conventional physiotherapy. Randomized controlled trial. Department of rehabilitation. Patients (N=60) admitted to our department postorthopedic surgery were randomly assigned to either a case (n=30) or control (n=30) group. Exclusion criteria were age 18 years or younger and 90 years or older, Mini-Mental State Examination score of 21 of 30 or lower, no ambulating order, advanced vision impairment, malignancy, pneumonia, or heart failure. All participants underwent conventional physiotherapy. In addition, patients in the case group were asked to observe video clips showing daily actions and to imitate them afterward. Patients in the control group were asked to observe video clips with no motor content and to execute the same actions as patients in the case group afterward. Participants were scored on functional scales at baseline and after treatment by a physician blinded to group assignment. Changes in FIM and Tinetti scale scores, and dependence on walking aids. At baseline, groups did not differ in clinical and functional scale scores. After treatment, patients in the case group scored better than patients in the control group (FIM total score, P=.02; FIM motor subscore, P=.001; Tinetti scale score, P=.04); patients in the case group were assigned more frequently to 1 crutch (P=.01). In addition to conventional physiotherapy, AOT is effective in the rehabilitation of postsurgical orthopedic patients. The present results strongly support top-down effects of this treatment in motor recovery, even in nonneurologic patients. Copyright © 2010 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.

  14. Central action of FGF19 reduces hypothalamic AGRP/NPY neuron activity and improves glucose metabolism.

    PubMed

    Marcelin, Geneviève; Jo, Young-Hwan; Li, Xiaosong; Schwartz, Gary J; Zhang, Ying; Dun, Nae J; Lyu, Rong-Ming; Blouet, Clémence; Chang, Jaw K; Chua, Streamson

    2014-02-01

    Tight control of glucose excursions has been a long-standing goal of treatment for patients with type 2 diabetes mellitus in order to ameliorate the morbidity and mortality associated with hyperglycemia. Fibroblast growth factor (FGF) 19 is a hormone-like enterokine released postprandially that emerged as a potential therapeutic agent for metabolic disorders, including diabetes and obesity. Remarkably, FGF19 treatment has hypoglycemic actions that remain potent in models of genetic and acquired insulin resistance. Here, we provided evidence that the central nervous system responds to FGF19 administered in the periphery. Then, in two mouse models of insulin resistance, leptin-deficiency and high-fat diet feeding, third intra-cerebro-ventricular infusions of FGF19 improved glycemic status, reduced insulin resistance and potentiated insulin signaling in the periphery. In addition, our study highlights a new mechanism of central FGF19 action, involving the suppression of AGRP/NPY neuronal activity. Overall, our work unveils novel regulatory pathways induced by FGF19 that will be useful in the design of novel strategies to control diabetes in obesity.

  15. Call to action: A new path for improving diabetes care for Indigenous peoples, a global review.

    PubMed

    Harris, Stewart B; Tompkins, Jordan W; TeHiwi, Braden

    2017-01-01

    Diabetes has reached epidemic proportions in Indigenous populations around the globe, and there is an urgent need to improve the health and health equity of Indigenous peoples with diabetes through timely and appropriate diabetes prevention and management strategies. This review describes the evolution of the diabetes epidemic in Indigenous populations and associated risk factors, highlighting gestational diabetes and intergenerational risk, lifestyle risk factors and social determinants as having particular importance and impact on Indigenous peoples. This review further describes the impact of chronic disease and diabetes on Indigenous peoples and communities, specifically diabetes-related comorbidities and complications. This review provides continued evidence that dramatic changes are necessary to reduce diabetes-related inequities in Indigenous populations, with a call to action to support programmatic primary healthcare transformation capable of empowering Indigenous peoples and communities and improving chronic disease prevention and management. Promising strategies for transforming health services and care for Indigenous peoples include quality improvement initiatives, facilitating diabetes and chronic disease registry and surveillance systems to identify care gaps, and prioritizing evaluation to build the evidence-base necessary to guide future health policy and planning locally and on a global scale. Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.

  16. Enhanced change detection performance reveals improved strategy use in avid action video game players.

    PubMed

    Clark, Kait; Fleck, Mathias S; Mitroff, Stephen R

    2011-01-01

    Recent research has shown that avid action video game players (VGPs) outperform non-video game players (NVGPs) on a variety of attentional and perceptual tasks. However, it remains unknown exactly why and how such differences arise; while some prior research has demonstrated that VGPs' improvements stem from enhanced basic perceptual processes, other work indicates that they can stem from enhanced attentional control. The current experiment used a change-detection task to explore whether top-down strategies can contribute to VGPs' improved abilities. Participants viewed alternating presentations of an image and a modified version of the image and were tasked with detecting and localizing the changed element. Consistent with prior claims of enhanced perceptual abilities, VGPs were able to detect the changes while requiring less exposure to the change than NVGPs. Further analyses revealed this improved change detection performance may result from altered strategy use; VGPs employed broader search patterns when scanning scenes for potential changes. These results complement prior demonstrations of VGPs' enhanced bottom-up perceptual benefits by providing new evidence of VGPs' potentially enhanced top-down strategic benefits.

  17. The Union RAP: Industry-Wide Research-Action Projects to Win Health and Safety Improvements

    PubMed Central

    McQuiston, Thomas H.; Lippin, Tobi Mae; Anderson, Leeann G.; Beach, M. Josie; Frederick, James; Seymour, Thomas A.

    2009-01-01

    Unions are ripe to engage in community-based participatory research (CBPR). We briefly profile 3 United Steelworker CBPR projects aimed at uncovering often-undocumented, industry-wide health and safety conditions in which US industrial workers toil. The results are to be used to advocate improvements at workplace, industry, and national policy levels. We offer details of our CBPR approach (Research-Action Project [RAP]) that engages workers and others in all research stages. Elements of RAPs include strategically constructed teams with knowledge of the industry and health and safety and with skills in research, participatory facilitation, and training; reciprocal training on these knowledge and skill areas; iterative processes of large and small group work; use of technology; and facilitator-developed tools and intermediate products. PMID:19890145

  18. Charting the course for home health care quality: action steps for achieving sustainable improvement: conference proceedings.

    PubMed

    Feldman, Penny Hollander; Peterson, Laura E; Reische, Laurie; Bruno, Lori; Clark, Amy

    2004-12-01

    On June 30 and July 1, 2003, the first national meeting Charting the Course for Home Health Care Quality: Action Steps for Achieving Sustainable Improvement convened in New York City. The Center for Home Care Policy & Research of the Visiting Nurse Service of New York (VNSNY) hosted the meeting with support from the Robert Wood Johnson Foundation. Fifty-seven attendees from throughout the United States participated. The participants included senior leaders and managers and nurses working directly in home care today. The meeting's objectives were to: 1. foster dialogue among key constituents influencing patient safety and home care, 2. promote information-sharing across sectors and identify areas where more information is needed, and, 3. develop an agenda and strategy for moving forward. This article reports the meeting's proceedings.

  19. Evidence for action on improving the maternal and newborn health workforce: The basis for quality care.

    PubMed

    Campbell, Jim; Sochas, Laura; Cometto, Giorgio; Matthews, Zoë

    2016-01-01

    Ambitious new goals to end preventable maternal and newborn deaths will not only require increased coverage but also improved quality of care. Unfortunately, current levels of quality in the delivery of maternal and newborn care are low in high-burden countries, for reasons that are intimately linked with inadequate planning and management of the maternal and newborn health workforce. The Global Strategy on Human Resources for Health is a key opportunity to strengthen global and country-level accountability frameworks for the health workforce and its capacity to deliver quality care. In order to succeed, maternal and newborn health specialists must embrace this strategy and its linkages with the new Global Strategy for Women's, Children's, and Adolescents' Health; action is needed across high- and low-income countries; and any accountability framework must be underpinned by ambitious, measurable indicators and strengthened data collection on human resources for health. Copyright © 2015. Published by Elsevier Ireland Ltd.

  20. Supersymmetry on the Lattice

    NASA Astrophysics Data System (ADS)

    Schaich, David

    2016-03-01

    Lattice field theory provides a non-perturbative regularization of strongly interacting systems, which has proven crucial to the study of quantum chromodynamics among many other theories. Supersymmetry plays prominent roles in the study of physics beyond the standard model, both as an ingredient in model building and as a tool to improve our understanding of quantum field theory. Attempts to apply lattice techniques to supersymmetric field theories have a long history, but until recently these efforts have generally encountered insurmountable difficulties related to the interplay of supersymmetry with the lattice discretization of spacetime. In recent years these difficulties have been overcome for a class of theories that includes the particularly interesting case of maximally supersymmetric Yang-Mills (N = 4 SYM) in four dimensions, which is a cornerstone of AdS/CFT duality. In combination with computational advances this progress enables practical numerical investigations of N = 4 SYM on the lattice, which can address questions that are difficult or impossible to handle through perturbation theory, AdS/CFT duality, or the conformal bootstrap program. I will briefly review some of the new ideas underlying this recent progress, and present some results from ongoing large-scale numerical calculations, including comparisons with analytic predictions.

  1. Study on performance improvements of a high-temperature superconducting coil with a lattice-shape cross section

    NASA Astrophysics Data System (ADS)

    Ishiguri, S.; Oka, T.; Fukui, S.; Ogawa, J.; Sato, T.

    2008-07-01

    For designing inexpensive high-temperature superconducting (HTS) coils, it is essential to obtain large magnetic fields and stored energy with shorter lengths of HTS tape. To improve the performance of a coil, it is necessary to improve its transport-current performance. The critical current and n-value of an HTS tape were measured at various magnetic field magnitudes and angles at 77 K. The HTS tape employed in the coil was Bi-2223/Ag tape. From this measured data, fitting equations of the critical current and n-values were obtained. With these fitting equations, coil critical currents were analyzed according to our analytical model. The analysis showed that relatively large electric fields are generated at coil edges, inhibiting improvement of the transport-current performance of the coil. To solve this problem, we propose an HTS coil, which is produced by cutting and displacing the central portion of the rectangular cross section. By this rearrangement, the magnetic field distribution changes, resulting in an improvement in the coil critical current. We calculated performances of the proposed coil by varying the magnitude of displaced coils while maintaining a constant total HTS tape length. We found that there is an optimum cross section shape of the proposed coil, which provides improvements in the stored energy and the central magnetic field. In particular, the stored energy improves by approximately 43% compared with a rectangular cross section coil employing the same HTS tape length.

  2. Introduction to lattice QCD

    SciTech Connect

    Gupta, R.

    1998-12-31

    The goal of the lectures on lattice QCD (LQCD) is to provide an overview of both the technical issues and the progress made so far in obtaining phenomenologically useful numbers. The lectures consist of three parts. The author`s charter is to provide an introduction to LQCD and outline the scope of LQCD calculations. In the second set of lectures, Guido Martinelli will discuss the progress they have made so far in obtaining results, and their impact on Standard Model phenomenology. Finally, Martin Luescher will discuss the topical subjects of chiral symmetry, improved formulation of lattice QCD, and the impact these improvements will have on the quality of results expected from the next generation of simulations.

  3. Public health actions to improve palliative care in Germany: results of a three-round Delphi study.

    PubMed

    Behmann, Mareike; Jünger, Saskia; Radbruch, Lukas; Schneider, Nils

    2012-08-01

    In previous studies, key targets for public health initiatives to improve palliative care in Germany were defined. The aim of this study was the identification and prioritisation of actions to achieve these targets. A three-round Delphi study with 107 stakeholders acting on the meso and macrolevel of the healthcare system was undertaken. First round: proposing actions for each of the key targets; second round: assessment of the actions regarding their relevance; third round: ranking of the actions. 37 actions were generated (first round) of which 14 actions were rated as relevant (second round). In the third round, the action ranked highest was "close collaboration between specialist palliative care services, general practitioners and community nursing services", followed by "Implementing specialist palliative care in the community consequently" and "Strengthening generalist palliative care through training and education of general practitioners and nursing services". The range and the ranking of the actions provide an empirical basis to improve palliative care in Germany on different levels of policy, education and clinical practice. A focus should be on strengthening the collaboration between primary health care providers and specialist palliative care services. Copyright © 2012 Elsevier Ireland Ltd. All rights reserved.

  4. Electric Polarizability of Neutral Hadrons from Lattice QCD

    SciTech Connect

    Joe Christensen; Walter Wilcox; Frank X. Lee; Leming Zhou

    2004-08-01

    By simulating a uniform electric field on a lattice and measuring the change in the rest mass, we calculate the electric polarizability of neutral mesons and baryons using the methods of quenched lattice QCD. Specifically, we measure the electric polarizability coefficient from the quadratic response to the electric field for 10 particles: the vector mesons {rho}{sup 0} and K{sup *0}; the octet baryons n, {Sigma}{sup 0}, {Lambda}{sub o}{sup 0}, {Lambda}{sub s}{sup 0}, and {Xi}{sup 0}; and the decouplet baryons {Delta}{sup 0}, {Sigma}{sup 0}, and {Xi}{sup 0}. Independent calculations using two fermion actions were done for consistency and comparison purposes. One calculation uses Wilson fermions with a lattice spacing of a = 0.10 fm. The other uses tadpole improved Luesher-Weiss gauge fields and clover quark action with a lattice spacing a = 0.17 fm. Our results for neutron electric polarizability are compared to experiment.

  5. Improving screening and diagnosis of exercise-induced bronchoconstriction: a call to action.

    PubMed

    Weiler, John M; Hallstrand, Teal S; Parsons, Jonathan P; Randolph, Christopher; Silvers, William S; Storms, William W; Bronstone, Amy

    2014-01-01

    This article summarizes the findings of an expert panel of nationally recognized allergists and pulmonologists who met to discuss how to improve detection and diagnosis of exercise-induced bronchoconstriction (EIB), a transient airway narrowing that occurs during and most often after exercise in people with and without underlying asthma. EIB is both commonly underdiagnosed and overdiagnosed. EIB underdiagnosis may result in habitual avoidance of sports and physical activity, chronic deconditioning, weight gain, poor asthma control, low self-esteem, and reduced quality of life. Routine use of a reliable and valid self-administered EIB screening questionnaire by professionals best positioned to screen large numbers of people could substantially improve the detection of EIB. The authors conducted a systematic review of the literature that evaluated the accuracy of EIB screening questionnaires that might be adopted for widespread EIB screening in the general population. Results of this review indicated that no existing EIB screening questionnaire had adequate sensitivity and specificity for this purpose. The authors present a call to action to develop a new EIB screening questionnaire, and discuss the rigorous qualitative and quantitative research necessary to develop and validate such an instrument, including key methodological pitfalls that must be avoided.

  6. Thromboxane synthase deficiency improves insulin action and attenuates adipose tissue fibrosis

    PubMed Central

    Lei, Xia; Li, Qing; Rodriguez, Susana; Tan, Stefanie Y.; Seldin, Marcus M.; McLenithan, John C.; Jia, Weiping

    2015-01-01

    Thromboxane A2, an arachidonic acid-derived eicosanoid generated by thromboxane synthase (TBXAS), plays critical roles in hemostasis and inflammation. However, the contribution of thromboxane A2 to obesity-linked metabolic dysfunction remains incompletely understood. Here, we used in vitro and mouse models to better define the role of TBXAS in metabolic homeostasis. We found that adipose expression of Tbxas and thromboxane A2 receptor (Tbxa2r) was significantly upregulated in genetic and dietary mouse models of obesity and diabetes. Expression of Tbxas and Tbxa2r was detected in adipose stromal cells, including macrophages. Furthermore, stimulation of macrophages with interferon-γ or resistin factors known to be upregulated in obesity induced Tbxas and Tbxa2r expression. Mice lacking Tbxas had similar weight gain, food intake, and energy expenditure. However, loss of Tbxas markedly enhanced insulin sensitivity in mice fed a low-fat diet. Improvement in glucose homeostasis was correlated with the upregulated expression of multiple secreted metabolic regulators (Ctrp3, Ctrp9, and Ctrp12) in the visceral fat depot. Following a challenge with a high-fat diet, Tbxas deficiency led to attenuated adipose tissue fibrosis and reduced circulating IL-6 levels without adipose tissue macrophages being affected; however, these changes were not sufficient to improve whole body insulin action. Together, our results highlight a novel, diet-dependent role for thromboxane A2 in modulating peripheral tissue insulin sensitivity and adipose tissue fibrosis. PMID:25738781

  7. Thromboxane synthase deficiency improves insulin action and attenuates adipose tissue fibrosis.

    PubMed

    Lei, Xia; Li, Qing; Rodriguez, Susana; Tan, Stefanie Y; Seldin, Marcus M; McLenithan, John C; Jia, Weiping; Wong, G William

    2015-05-01

    Thromboxane A2, an arachidonic acid-derived eicosanoid generated by thromboxane synthase (TBXAS), plays critical roles in hemostasis and inflammation. However, the contribution of thromboxane A2 to obesity-linked metabolic dysfunction remains incompletely understood. Here, we used in vitro and mouse models to better define the role of TBXAS in metabolic homeostasis. We found that adipose expression of Tbxas and thromboxane A2 receptor (Tbxa2r) was significantly upregulated in genetic and dietary mouse models of obesity and diabetes. Expression of Tbxas and Tbxa2r was detected in adipose stromal cells, including macrophages. Furthermore, stimulation of macrophages with interferon-γ or resistin factors known to be upregulated in obesity induced Tbxas and Tbxa2r expression. Mice lacking Tbxas had similar weight gain, food intake, and energy expenditure. However, loss of Tbxas markedly enhanced insulin sensitivity in mice fed a low-fat diet. Improvement in glucose homeostasis was correlated with the upregulated expression of multiple secreted metabolic regulators (Ctrp3, Ctrp9, and Ctrp12) in the visceral fat depot. Following a challenge with a high-fat diet, Tbxas deficiency led to attenuated adipose tissue fibrosis and reduced circulating IL-6 levels without adipose tissue macrophages being affected; however, these changes were not sufficient to improve whole body insulin action. Together, our results highlight a novel, diet-dependent role for thromboxane A2 in modulating peripheral tissue insulin sensitivity and adipose tissue fibrosis. Copyright © 2015 the American Physiological Society.

  8. Action Research: A Tool for Improving Teacher Quality and Classroom Practice

    ERIC Educational Resources Information Center

    O'Connor, Katherine A.; Greene, H. Carol; Anderson, Patricia J.

    2006-01-01

    Background: Action research is a meaningful form of research because it is conducted by the teacher in his or her own classroom. Action research requires a teacher to design a study in an area of interest and conduct it in their own classroom. Action research is a requirement for some masters of education programs in the United States. Purpose: To…

  9. Action Analytics: Measuring and Improving Performance that Matters in Higher Education

    ERIC Educational Resources Information Center

    Norris, Donald; Baer, Linda; Leonard, Joan; Pugliese, Louis; Lefrere, Paul

    2008-01-01

    The action analytics of the future will better assess students' competencies. Using individualized planning, advising, and best practices from cradle to career, these action analytics solutions will align interventions to facilitate retention and transitions and will fully maximize learners' success. Six primary actions are needed to evolve from…

  10. Action Analytics: Measuring and Improving Performance that Matters in Higher Education

    ERIC Educational Resources Information Center

    Norris, Donald; Baer, Linda; Leonard, Joan; Pugliese, Louis; Lefrere, Paul

    2008-01-01

    The action analytics of the future will better assess students' competencies. Using individualized planning, advising, and best practices from cradle to career, these action analytics solutions will align interventions to facilitate retention and transitions and will fully maximize learners' success. Six primary actions are needed to evolve from…

  11. "PHE in Action": Development and Modeling of an Intervention to Improve Patient Engagement among Older Adults.

    PubMed

    Menichetti, Julia; Graffigna, Guendalina

    2016-01-01

    The increasing prevalence of chronic conditions among older adults constitutes a major public health problem. Thus, changes in lifestyles are required to prevent secondary conditions and sustain good care practices. While patient engagement received great attention in the last years as key strategy to solve this issue, to date no interventions exist to sustain the engagement of older chronic patients toward their health management. This study describes the design, development, and optimization of PHEinAction, a theoretically-driven intervention program to increase patient engagement in older chronic populations and consequently to foster healthy changes that can help reduce risks of health problems. The development process followed the UK Medical Research Council's (MRC) guidelines and involved selecting the theoretical base for the intervention, identifying the relevant evidence-based literature, and conducting exploratory research to qualitatively evaluate program's feasibility, acceptability, and comprehension. The result was a user-endorsed intervention designed to improve older patients' engagement in health management based on the theoretical framework of the Patient Health Engagement (PHE) model. The intervention program, which emerged from this process, consisted of 2 monthly face-to-face 1-h sessions delivered by a trained facilitator and one brief telephonic consultation, and aimed to facilitate a range of changes for patient engagement (e.g., motivation to change, health information seeking and use, emotional adjustment, health behaviors planning). PHEinAction is the first example of a theoretically-based patient engagement intervention designed for older chronic targets. The intervention program is based on psychological theory and evidence; it facilitates emotional, psychological, and behavioral processes to support patient engagement and lifestyle change and maintenance. It provides estimates of the extent to which it could help high-risk groups

  12. [Action Plan to Improve the Utilization of Stationary Bikes in a Health Promotion Exercise Program].

    PubMed

    Huang, Yu-Yen; Chen, Hsiu-Yuen; Wu, Chia-Chien; Chen, Yao-Mei

    2015-06-01

    Research has shown that exercise helps reduce the risk and the severity of metabolic syndrome. Since 2009, KMHK hospital has implemented a primary-prevention health promotion program that targets individuals who are at elevated risk of metabolic syndrome. The program engages participants in an exercise protocol that asks them to exercise regularly on a stationary bike three times a week for six months. The utilization rate of the stationary bikes averaged 75% in 2010, but reduced to 34.7% in 2011, with an average withdrawal rate of 24.3%. Therefore, an action team was assembled in order to enhance the effectiveness of the program. This project used two primary strategies to increase the utilization of stationary bikes. These strategies included: increasing referrals and decreasing withdrawals. Surveys of participants who, respectfully, failed to complete and successfully completed the exercise protocol were conducted to identify the factors associated with non-completion / completion. The enrollment policies, the equipment, and the environment were inspected comprehensively. After identifying the causes and effects, several interventions were implemented. These interventions included: installing insulation curtains to block direct sunlight, upgrading the stationary bikes to newer models, creating an environment more conducive to exercise, promoting the referral policies, marketing the health promotion program, and securing family support. After three months, the utilization rate of stationary bikes increased to 77.8%, representing an improvement rate of 124%. Furthermore, the number of case referrals significantly increased and the withdrawal rate decreased to 4.8%. Finally, longer-term follow up indicates that the utilization rate and the withdrawal rate have continued to improve. The program implemented in the present study successfully enrolled more participants in the exercise protocol, as evidenced by the increased utilization of stationary bikes and by the

  13. Nano-structured and functionalized surfaces for cytocompatibility improvement and bactericidal action.

    PubMed

    Slepicka, Petr; Kasalkova, Nikola Slepickova; Siegel, Jakub; Kolska, Zdenka; Bacakova, Lucie; Svorcik, Vaclav

    2015-11-01

    The field of material surface modification with the aim of biomaterial construction involves several approaches of treatments that allow the preparation of materials, which positively influence adhesion of cells and their proliferation and thus aid and improve tissue formation. Modified materials have a surface composition and morphology intended to interact with biological systems and cellular functions. Not only surface chemistry has an effect on material biological response, surface structures of different morphology can be constructed to guide a desirable biological outcome. Nano-patterned material surfaces have been tested with the aim of how surface geometry and physical properties on a micro- and nano-scale can affect cellular response and influence cell adhesion and proliferation. Biological functionality of solid state substrates was significantly improved by the irradiation of material with plasma discharge or laser treatment. Commonly used "artificial" polymers (e.g. polyethylene (PE), polystyrene (PS), polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), polyethylene naphthalate (PEN)) and biopolymers (e.g. Poly-l-Lactic acid (PLLA), polymethylpentene (PMP)) were treated with aim of biocompatibility improvement. The treatment of polymer/biopolymer substrates leads to formation of ripple or wrinkle-like structures, supported also with heat treatment or other subsequent surface processing. Several types of chemically different substances (e.g. metal or carbon nano-particles, proteins) were grafted onto material surfaces or built into material structures by different processes. Surface physico-chemical properties (e.g. chemistry, charge, morphology, wettability, electrical conductivity, optical and mechanical properties) of treated surfaces were determined. The enhancement of adhesion and proliferation of cells on modified substrates was investigated in vitro. Bactericidal action of noble metal nano-particles (e.g. Au, Ag) on polymers was

  14. Improvements of sensorimotor processes during action cascading associated with changes in sensory processing architecture–insights from sensory deprivation

    PubMed Central

    Gohil, Krutika; Hahne, Anja; Beste, Christian

    2016-01-01

    In most everyday situations sensorimotor processes are quite complex because situations often require to carry out several actions in a specific temporal order; i.e. one has to cascade different actions. While it is known that changes to stimuli affect action cascading mechanisms, it is unknown whether action cascading changes when sensory stimuli are not manipulated, but the neural architecture to process these stimuli is altered. In the current study we test this hypothesis using prelingually deaf subjects as a model to answer this question. We use a system neurophysiological approach using event-related potentials (ERPs) and source localization techniques. We show that prelingually deaf subjects show improvements in action cascading. However, this improvement is most likely not due to changes at the perceptual (P1-ERP) and attentional processing level (N1-ERP), but due to changes at the response selection level (P3-ERP). It seems that the temporo-parietal junction (TPJ) is important for these effects to occur, because the TPJ comprises overlapping networks important for the processing of sensory information and the selection of responses. Sensory deprivation thus affects cognitive processes downstream of sensory processing and only these seem to be important for behavioral improvements in situations requiring complex sensorimotor processes and action cascading. PMID:27321666

  15. Improvements of sensorimotor processes during action cascading associated with changes in sensory processing architecture-insights from sensory deprivation.

    PubMed

    Gohil, Krutika; Hahne, Anja; Beste, Christian

    2016-06-20

    In most everyday situations sensorimotor processes are quite complex because situations often require to carry out several actions in a specific temporal order; i.e. one has to cascade different actions. While it is known that changes to stimuli affect action cascading mechanisms, it is unknown whether action cascading changes when sensory stimuli are not manipulated, but the neural architecture to process these stimuli is altered. In the current study we test this hypothesis using prelingually deaf subjects as a model to answer this question. We use a system neurophysiological approach using event-related potentials (ERPs) and source localization techniques. We show that prelingually deaf subjects show improvements in action cascading. However, this improvement is most likely not due to changes at the perceptual (P1-ERP) and attentional processing level (N1-ERP), but due to changes at the response selection level (P3-ERP). It seems that the temporo-parietal junction (TPJ) is important for these effects to occur, because the TPJ comprises overlapping networks important for the processing of sensory information and the selection of responses. Sensory deprivation thus affects cognitive processes downstream of sensory processing and only these seem to be important for behavioral improvements in situations requiring complex sensorimotor processes and action cascading.

  16. Baryon Resonances from a Novel Fat-Link Fermion Action

    SciTech Connect

    W. Melnitchouk; S. Bilson-Thompson; F. D. R. Bonnet; P. D. Coddington; F. X. Lee; D. B. Leinweber; A. G. Williams; J. M. Zanotti; J. B. Zhang

    2001-07-01

    We present first results for masses of positive and negative parity excited baryons in lattice QCD using an O(a{sup 2}) improved gluon action and a Fat Link Irrelevant Clover (FLIC) fermion action in which only the irrelevant operators are constructed with fat links. The results are in agreement with earlier calculations of N* resonances using improved actions and exhibit a clear mass splitting between the nucleon and its chiral partner, even for the Wilson fermion action. The results also indicate a splitting between the lowest J{sup P}=1/2{sup -} states for the standard nucleon interpolating fields.

  17. Biopsy-induced inflammatory conditions improve endometrial receptivity: the mechanism of action.

    PubMed

    Gnainsky, Y; Granot, I; Aldo, P; Barash, A; Or, Y; Mor, G; Dekel, N

    2015-01-01

    A decade ago, we first reported that endometrial biopsy significantly improves the success of pregnancy in IVF patients with recurrent implantation failure, an observation that was later confirmed by others. Recently, we have demonstrated that this treatment elevated the levels of endometrial pro-inflammatory cytokines and increased the abundance of macrophages (Mac) and dendritic cells (DCs). We therefore hypothesised that the biopsy-related successful pregnancy is secondary to an inflammatory response, and aimed at deciphering its mechanism of action. Supporting our hypothesis, we found that the pro-inflammatory TNFα stimulated primary endometrial stromal cells to express cytokines that attracted monocytes and induced their differentiation into DCs. These monocyte-derived DCs stimulated endometrial epithelial cells to express the adhesive molecule SPP1 (osteopontin (OPN)) and its receptors ITGB3 and CD44, whereas MUC16, which interferes with adhesion, was downregulated. Other implantation-associated genes, such as CHST2, CCL4 (MIP1B) and GROA, were upregulated by monocyte-derived Mac. These findings suggest that uterine receptivity is mediated by the expression of molecules associated with inflammation. Such an inflammatory milieu is not generated in some IVF patients with recurrent implantation failure in the absence of local injury provoked by the biopsy treatment.

  18. Improved top-down control reduces oculomotor capture: the case of action video game players.

    PubMed

    Chisholm, Joseph D; Kingstone, Alan

    2012-02-01

    Action video game players (AVGPs) have been demonstrated to outperform non-video-game players(NVGPs) on a range of cognitive tasks. Evidence to date suggests that AVGPs’ enhanced performance in attention based tasks can be accounted for by improved top-down control over the allocation of visuospatial attention. Thus,we propose that AVGPs provide a population that can be used to investigate the role of top-down factors in key models of attention. Previous work using AVGPs has indicated that they experience less interfering effects from a salient but task-irrelevant distractor in an attentional capture paradigm (Chisholm, Hickey, Theeuwes, & Kingstone,2010). Two fundamentally different bottom-up and top-down models of attention can account for this result. In the present study, we compared AVGP and NVGP performance in an oculomotor capture paradigm to address when and how top-down control modulates capture. In tracking eye movements, we acquired an explicit measurement of attention allocation and replicated the covert attention effect that AVGPs are quicker than NVGPs to attend to a target in the presence of a task-irrelevant distractor. Critically, our study reveals that this top-down gain is the result of fewer shifts of attention to the salient distractor, rather than faster disengagement after bottom-up capture has occurred. This supports the theory that top-down control can modulate the involuntary capture of attention [added].

  19. Embodied Action Improves Cognition in Children: Evidence from a Study Based on Piagetian Conservation Tasks

    PubMed Central

    Lozada, Mariana; Carro, Natalia

    2016-01-01

    Converging evidence highlights the relevance of embodied cognition in learning processes. In this study we evaluate whether embodied action (enaction) improves cognitive understanding in children. Using the Piagetian conservation tasks in 6–7 year olds, we analyzed quantity conservation conceptualization in children who were active participants in the transformation process and compared these results to those of children who were mere observers of an adult's demonstration (as traditionally conducted). The investigation was performed with 105 first-graders. Conservation tasks were demonstrated to half the children, while the other half actively carried out the transformation of matter. Our findings showed that active manipulation of the material helped children recognize quantity invariance in a higher proportion than when the demonstration was only observed. That is, their enactive experience enabled them to comprehend conservation phenomena more easily than if they were merely passive observers. The outcome of this research thus emphasizes how active participation benefits cognitive processes in learning contexts, promoting autonomy, and agency during childhood. PMID:27047420

  20. Embodied Action Improves Cognition in Children: Evidence from a Study Based on Piagetian Conservation Tasks.

    PubMed

    Lozada, Mariana; Carro, Natalia

    2016-01-01

    Converging evidence highlights the relevance of embodied cognition in learning processes. In this study we evaluate whether embodied action (enaction) improves cognitive understanding in children. Using the Piagetian conservation tasks in 6-7 year olds, we analyzed quantity conservation conceptualization in children who were active participants in the transformation process and compared these results to those of children who were mere observers of an adult's demonstration (as traditionally conducted). The investigation was performed with 105 first-graders. Conservation tasks were demonstrated to half the children, while the other half actively carried out the transformation of matter. Our findings showed that active manipulation of the material helped children recognize quantity invariance in a higher proportion than when the demonstration was only observed. That is, their enactive experience enabled them to comprehend conservation phenomena more easily than if they were merely passive observers. The outcome of this research thus emphasizes how active participation benefits cognitive processes in learning contexts, promoting autonomy, and agency during childhood.

  1. Disaster mitigation action plan: Digital media on improving accountability and community relationships

    NASA Astrophysics Data System (ADS)

    Adila, I.; Dewi, W. W. A.; Tamitiadini, D.; Syauki, W. R.

    2017-06-01

    This study wants to address on how communication science is applied to Disaster Mitigation Plan. Especially, the implementation of Community Media and Development of Communication Technology that synergize to create a Disaster Mitigation Medium, which is appropriate for typology of Indonesia. Various levels of priorities that include disaster mitigation information, namely, increasing chain system of early warning systems, building evacuation, improving alertness and capacity to face a disaster, as well as minimizing disaster risk factor. Through this concept, mitigation actions plan of Tulungagung Coastal areas is expected to be applied in other regions in Indonesia by BNPB (Badan Nasional Penanggulangan Bencana). Having this strategy to be implemented based on region characteristics, it is expected that risk reduction process can be run optimally. As a result, the strategy is known as Community-Based Disaster Risk Reduction (PRBBK), which means as the organized-efforts by society for pra-, during, and post- disaster by using available resources as much as possible to prevent, reduce, avoid, and recover from the impact of disasters. Therefore, this result can be a Pilot Project for BNBP Indonesia, as a government decisive attitude for the next steps in protecting people residing in the region prone to natural disasters all over Indonesia.

  2. A Mirror Therapy-Based Action Observation Protocol to Improve Motor Learning After Stroke.

    PubMed

    Harmsen, Wouter J; Bussmann, Johannes B J; Selles, Ruud W; Hurkmans, Henri L P; Ribbers, Gerard M

    2015-07-01

    Mirror therapy is a priming technique to improve motor function of the affected arm after stroke. To investigate whether a mirror therapy-based action observation (AO) protocol contributes to motor learning of the affected arm after stroke. A total of 37 participants in the chronic stage after stroke were randomly allocated to the AO or control observation (CO) group. Participants were instructed to perform an upper-arm reaching task as fast and as fluently as possible. All participants trained the upper-arm reaching task with their affected arm alternated with either AO or CO. Participants in the AO group observed mirrored video tapes of reaching movements performed by their unaffected arm, whereas participants in the CO group observed static photographs of landscapes. The experimental condition effect was investigated by evaluating the primary outcome measure: movement time (in seconds) of the reaching movement, measured by accelerometry. Movement time decreased significantly in both groups: 18.3% in the AO and 9.1% in the CO group. Decrease in movement time was significantly more in the AO compared with the CO group (mean difference = 0.14 s; 95% confidence interval = 0.02, 0.26; P = .026). The present study showed that a mirror therapy-based AO protocol contributes to motor learning after stroke. © The Author(s) 2014.

  3. Improving the quality of care for children with wheeze: The use of electronic asthma action plans and electronic pre-school wheeze action plans.

    PubMed

    O'Leary, Fenton; Pegiazoglou, Ioannis; Marshall, Tracey; Thosar, Deepali; Deck, Mitchell; Peat, Jennifer; Ging, Joanna; Selvadurai, Hiran

    2016-09-01

    To measure the long-term improvement in the documented provision of an asthma action plan (AAP) to children with asthma and wheeze discharged from the Emergency Department following the introduction of the electronic AAP (eAAP) and to determine the need for an electronic pre-school wheeze action plan in our population. A retrospective case note review, from July 2014 to June 2015, of all patients over 12 months old discharged from the Emergency Department or Emergency Medical Unit, with a discharge diagnosis of either asthma or wheeze. The primary outcome was the documentation of an AAP, either recorded electronically as an eAAP or a report of an AAP as part of the patient medical record. Two thousand three hundred and forty-two patients were included in the study, 926 with asthma and 1416 with wheeze. The median age was 3.3 years (interquartile range (IQR) 3.5, range 1-15.9 years). The median age of the children with asthma was 5.3 years (IQR 4.6) and of the children with wheeze was 2.5 years (IQR 2.0).Overall, 1683 (71.9%) children had a documented AAP, with a significant difference between those with a discharge diagnosis of asthma (85.9%) compared with wheeze (62.9%), P < 0.001. These results justified the design of the electronic pre-school wheeze action plan. The integration of an eAAP into the Emergency Department has resulted in a sustained improvement in the documented provision of an AAP to children with a discharge diagnosis of asthma. Children with a discharge diagnosis of wheeze are significantly less likely to receive an action plan. © 2016 The Authors. Journal of Paediatrics and Child Health published by John Wiley & Sons Australia, Ltd on behalf of Paediatrics and Child Health Division (The Royal Australasian College of Physicians).

  4. Improving the Operability of the Cosmic-ray Neutron Soil Moisture Method: An Estimation of Lattice Water using Global Datasets

    NASA Astrophysics Data System (ADS)

    Finkenbiner, C. E.; Avery, W. A.; Kuzila, M.; Munoz-Arriola, F.; Franz, T. E.

    2015-12-01

    Currently, global trends in consumptive water-use indicate an increasing and unsustainable reliance on groundwater resources. Each year approximately 60% of water used for agriculture is wasted through inadequate water conservation, losses in distribution, and inappropriate times and rates of irrigation. Therefore, in order to coordinate a strategy to accomplish the agricultural demands of our global community we must maintain a stable global food and water trade while increasing crop yield and efficiency. This research aims to improve the operability of the recently developed and promising cosmic-ray neutron method for estimating field scale soil moisture. The sensor works by passively counting above ground low-energy neutrons which correlate to the total water in the sensor measurement volume (a sphere with radius of ~300 m and vertical soil depth of ~30 cm). Because the sensor responds to different forms of water (sources of hydrogen), estimates of background water in the mineral soil need to be accounted for in order to minimize measurement error. Here we compared field-scale estimates of soil mineral water with readily available global datasets. Using the newly compiled 1km resolution Global Soil Dataset (GSDE), we were able to investigate the correlation between soil mineral water and clay content for various soil taxonomic orders. Preliminary results suggest statistically significant linear relationships for Aridisol, Mollisol and Ultisol soil orders. Incorporation of this dataset will allow for real-time soil moisture mapping of hundreds of center-pivots using the mobile cosmic-ray probe without the need for time-consuming in-situ soil sampling. Integrating this technique into soil moisture management has the potential to increase the efficiency of irrigation water used in agriculture.

  5. A Low-Literacy Asthma Action Plan to Improve Provider Asthma Counseling: A Randomized Study.

    PubMed

    Yin, H Shonna; Gupta, Ruchi S; Tomopoulos, Suzy; Mendelsohn, Alan L; Egan, Maureen; van Schaick, Linda; Wolf, Michael S; Sanchez, Dayana C; Warren, Christopher; Encalada, Karen; Dreyer, Benard P

    2016-01-01

    The use of written asthma action plans (WAAPs) has been associated with reduced asthma-related morbidity, but there are concerns about their complexity. We developed a health literacy-informed, pictogram- and photograph-based WAAP and examined whether providers who used it, with no training, would have better asthma counseling quality compared with those who used a standard plan. Physicians at 2 academic centers randomized to use a low-literacy or standard action plan (American Academy of Allergy, Asthma and Immunology) to counsel the hypothetical parent of child with moderate persistent asthma (regimen: Flovent 110 μg 2 puffs twice daily, Singulair 5 mg daily, Albuterol 2 puffs every 4 hours as needed). Two blinded raters independently reviewed counseling transcriptions. medication instructions presented with times of day (eg, morning and night vs number of times per day) and inhaler color; spacer use recommended; need for everyday medications, even when sick, addressed; and explicit symptoms used. 119 providers were randomly assigned (61 low literacy, 58 standard). Providers who used the low-literacy plan were more likely to use times of day (eg, Flovent morning and night, 96.7% vs 51.7%, P < .001; odds ratio [OR] = 27.5; 95% confidence interval [CI], 6.1-123.4), recommend spacer use (eg, Albuterol, 83.6% vs 43.1%, P < .001; OR = 6.7; 95% CI, 2.9-15.8), address need for daily medications when sick (93.4% vs 34.5%, P < .001; OR = 27.1; 95% CI, 8.6-85.4), use explicit symptoms (eg, "ribs show when breathing," 54.1% vs 3.4%, P < .001; OR = 33.0; 95% CI, 7.4-147.5). Few mentioned inhaler color. Mean (SD) counseling time was similar (3.9 [2.5] vs 3.8 [2.6] minutes, P = .8). Use of a low-literacy WAAP improves the quality of asthma counseling by helping providers target key issues by using recommended clear communication principles. Copyright © 2016 by the American Academy of Pediatrics.

  6. Use of the step-up action research model to improve trauma-related nursing educational practice.

    PubMed

    Seale, Ielse; De Villiers, Johanna C

    2015-10-23

    A lack of authentic learning opportunities influence the quality of emergency training of nursing students. The purpose of this article is to describe how the step-up action research model was used to improve the quality of trauma-related educational practice of undergraduate nursing students. To reduce deaths caused by trauma, healthcare workers should be competent to provide emergency care and collaborate effectively with one another. A simulated mass casualty incident, structured to support the integration of theory into practice, became a more rigorous action research activity which focused on the quality improvement of the mass casualty incident. The results indicated improved student learning; partnership appreciation; improved student coping mechanisms, and increased student exposure. Quality emergency training thus results in better real-life collaboration in emergency contexts. The step-up action research model proved to be a collaborative and flexible process. To improve the quality and rigour of educational programmes it is therefore recommended that the step-up action research model be routinely used in the execution of educational practices.

  7. The application of the starfish hatching enzyme for the improvement of scar and keloid based on the fibroblast-populated collagen lattice.

    PubMed

    Li, Zhi Jiang; Kim, Sang Moo

    2014-06-01

    Various bioactivities of the starfish hatching enzyme (HE) including collagen gel contraction, MMPs activity, hydroxyproline release, and gene regulation based on the fibroblast-populated collagen lattice (FPCL) in three-dimensional medium were investigated for the improvement of scar and keloid. The starfish HE significantly inhibited the collagen gel contraction over 2 days of culture. MMP-2 and MMP-9 activities were also identified by gelatin zymography and RT-PCR products with both HE and collagenase treatments, which resulted in the high amount of hydroxyproline release. The HE treatment on the FPCL significantly inhibited the fibroblast proliferation at 3 days of culture. The LPS-induced NO level and iNOS mRNA expression at low concentrations of HE presented a certain ability to inflammatory response. The COX-2 mRNA from the FPCL indicated no significant inflammation-mediated activity at 5 μg/mL of HE, whereas the cytokines of TNF-α and IL-1β were significantly higher than those of the control. Hence, the starfish hatching enzyme can regulate the fibroblast-populated collagen gel conditions by the contraction, MMP production, inflammatory gene expression, etc. Therefore, the starfish HE could be a potential cosmeceutical to heal the scar and keloid tissue.

  8. Hadroquarkonium from lattice QCD

    NASA Astrophysics Data System (ADS)

    Alberti, Maurizio; Bali, Gunnar S.; Collins, Sara; Knechtli, Francesco; Moir, Graham; Söldner, Wolfgang

    2017-04-01

    The hadroquarkonium picture [S. Dubynskiy and M. B. Voloshin, Phys. Lett. B 666, 344 (2008), 10.1016/j.physletb.2008.07.086] provides one possible interpretation for the pentaquark candidates with hidden charm, recently reported by the LHCb Collaboration, as well as for some of the charmoniumlike "X , Y , Z " states. In this picture, a heavy quarkonium core resides within a light hadron giving rise to four- or five-quark/antiquark bound states. We test this scenario in the heavy quark limit by investigating the modification of the potential between a static quark-antiquark pair induced by the presence of a hadron. Our lattice QCD simulations are performed on a Coordinated Lattice Simulations (CLS) ensemble with Nf=2 +1 flavors of nonperturbatively improved Wilson quarks at a pion mass of about 223 MeV and a lattice spacing of about a =0.0854 fm . We study the static potential in the presence of a variety of light mesons as well as of octet and decuplet baryons. In all these cases, the resulting configurations are favored energetically. The associated binding energies between the quarkonium in the heavy quark limit and the light hadron are found to be smaller than a few MeV, similar in strength to deuterium binding. It needs to be seen if the small attraction survives in the infinite volume limit and supports bound states or resonances.

  9. Towards a Collaborative Action Research in Spain to Improve Teaching Practice

    ERIC Educational Resources Information Center

    Fernández-Díaz, Elia; Calvo, Adelina; Rodríguez-Hoyos, Carlos

    2014-01-01

    This article describes a collaborative action research process in pre-school and primary education in Spain during a four-year period (2006-2010). The aim was the need to promote a level of reflection among the participants as to their teaching practice. The methodology used was a technologically mediated action research process. The results are…

  10. Improving Cancer-Related Outcomes with Connected Health - Action Items at a Glance

    Cancer.gov

    Action Item 1.1: Health IT stakeholder groups should continue to collaborate to overcome policy and technical barriers to a nationwide, interoperable health IT system. Action Item 1.2: Technical standards for information related to cancer care across the continuum should be developed, tested, disseminated, and adopted.

  11. Improving Pedagogy through Action Learning and Scholarship of Teaching and Learning

    ERIC Educational Resources Information Center

    Albers, Cheryl

    2008-01-01

    This ASA Teaching Workshop explored the potential of Action Learning to use teachers' tacit knowledge to collaboratively confront pedagogical issues. The Action Learning model grows out of industrial management and is based on the notion that peers are a valuable resource for learning about how to solve the problems encountered in the workplace.…

  12. 78 FR 1562 - Improving Government Regulations; Unified Agenda of Federal Regulatory and Deregulatory Actions

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-08

    ... Flexibility Analysis Required: Yes. Agency Contact: Manuel Quinones, Department of Defense, Defense.... Final Action 03/00/13 Regulatory Flexibility Analysis Required: Yes. Agency Contact: Manuel Quinones... Period End 01/21/12 Final Action 02/00/13 Regulatory Flexibility Analysis Required: Yes. Agency...

  13. Towards a Collaborative Action Research in Spain to Improve Teaching Practice

    ERIC Educational Resources Information Center

    Fernández-Díaz, Elia; Calvo, Adelina; Rodríguez-Hoyos, Carlos

    2014-01-01

    This article describes a collaborative action research process in pre-school and primary education in Spain during a four-year period (2006-2010). The aim was the need to promote a level of reflection among the participants as to their teaching practice. The methodology used was a technologically mediated action research process. The results are…

  14. Improving Physics Teaching through Action Research: The Impact of a Nationwide Professional Development Programme

    ERIC Educational Resources Information Center

    Grace, Marcus; Rietdijk, Willeke; Garrett, Caro; Griffiths, Janice

    2015-01-01

    This article presents an independent evaluation of the Action Research for Physics (ARP) programme, a nationwide professional development programme which trains teachers to use action research to increase student interest in physics and encourage them to take post-compulsory physics. The impact of the programme was explored from the perspective of…

  15. Participatory Action Research for Educational Leadership: Using Data-Driven Decision Making to Improve Schools

    ERIC Educational Resources Information Center

    James, E. Alana; Milenkiewicz, Margaret T.; Bucknam, Alan

    2007-01-01

    The participatory action research (PAR) process discussed in the text represents the next evolutionary stage for action research and practitioner research in education. The authors integrate process with methodology to provide an overview of the PAR process similar to professional learning communities in schools. Results of the original PAR study…

  16. Looking in the mirror: Teachers' use of autobiography and action research to improve practice

    NASA Astrophysics Data System (ADS)

    Davis, Nancy T.

    1996-03-01

    This study presents an argument for valuing subjective, reflective knowledge based on Habermas' category of cognitive interest of emancipatory knowing. Using the teachers' autobiographies and action research as data sources, the process of personal empowerment is explored. A model of change derived from analysis of teachers' writings is proposed that includes disturbance, alternatives, confidence and action.

  17. Improving Pedagogy through Action Learning and Scholarship of Teaching and Learning

    ERIC Educational Resources Information Center

    Albers, Cheryl

    2008-01-01

    This ASA Teaching Workshop explored the potential of Action Learning to use teachers' tacit knowledge to collaboratively confront pedagogical issues. The Action Learning model grows out of industrial management and is based on the notion that peers are a valuable resource for learning about how to solve the problems encountered in the workplace.…

  18. Improving Physics Teaching through Action Research: The Impact of a Nationwide Professional Development Programme

    ERIC Educational Resources Information Center

    Grace, Marcus; Rietdijk, Willeke; Garrett, Caro; Griffiths, Janice

    2015-01-01

    This article presents an independent evaluation of the Action Research for Physics (ARP) programme, a nationwide professional development programme which trains teachers to use action research to increase student interest in physics and encourage them to take post-compulsory physics. The impact of the programme was explored from the perspective of…

  19. Comparison of | Q|=1 and | Q|=2 gauge-field configurations on the lattice four-torus

    NASA Astrophysics Data System (ADS)

    Bilson-Thompson, Sundance O.; Leinweber, Derek B.; Williams, Anthony G.; Dunne, Gerald V.

    2004-06-01

    It is known that exactly self-dual gauge-field configurations with topological charge | Q|=1 cannot exist on the untwisted continuum four-torus. We explore the manifestation of this remarkable fact on the lattice four-torus for SU(3) using advanced techniques for controlling lattice discretization errors, extending earlier work of De Forcrand et al. for SU(2). We identify three distinct signals for the instability of | Q|=1 configurations, and show that these signals manifest themselves early in the cooling process, long before the would-be instanton has shrunk to a size comparable to the lattice discretization threshold. These signals do not appear for the individual instantons which make up our | Q|=2 configurations. This indicates that these signals reflect the truly global nature of the instability, rather than the local discretization effects which cause the eventual disappearance of the would-be single instanton. Monte-Carlo generated SU(3) gauge-field configurations are cooled to the self-dual limit using an O(a 4) -improved gauge action chosen to have small but positive O(a 6) errors. This choice prevents lattice discretization errors from destroying instantons provided their size exceeds the dislocation threshold of the cooling algorithm. Lattice discretization errors are evaluated by comparing the O(a 4) -improved gauge-field action with an O(a 4) -improved action constructed from the square of an O(a 4) -improved lattice field-strength tensor, thus having different O(a 6) discretization errors. The number of action-density peaks, the instanton size, and the topological charge of configurations is monitored. We observe a fluctuation in the total topological charge of | Q|=1 configurations, and demonstrate that the onset of this unusual behavior corresponds with the disappearance of multiple-peaks in the action density. At the same time discretization errors are minimal.

  20. Automated generation of lattice QCD Feynman rules

    NASA Astrophysics Data System (ADS)

    Hart, A.; von Hippel, G. M.; Horgan, R. R.; Müller, E. H.

    2009-12-01

    The derivation of the Feynman rules for lattice perturbation theory from actions and operators is complicated, especially for highly improved actions such as HISQ. This task is, however, both important and particularly suitable for automation. We describe a suite of software to generate and evaluate Feynman rules for a wide range of lattice field theories with gluons and (relativistic and/or heavy) quarks. Our programs are capable of dealing with actions as complicated as (m)NRQCD and HISQ. Automated differentiation methods are used to calculate also the derivatives of Feynman diagrams. Program summaryProgram title: HiPPY, HPsrc Catalogue identifier: AEDX_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEDX_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: GPLv2 (see Additional comments below) No. of lines in distributed program, including test data, etc.: 513 426 No. of bytes in distributed program, including test data, etc.: 4 893 707 Distribution format: tar.gz Programming language: Python, Fortran95 Computer: HiPPy: Single-processor workstations. HPsrc: Single-processor workstations and MPI-enabled multi-processor systems Operating system: HiPPy: Any for which Python v2.5.x is available. HPsrc: Any for which a standards-compliant Fortran95 compiler is available Has the code been vectorised or parallelised?: Yes RAM: Problem specific, typically less than 1 GB for either code Classification: 4.4, 11.5 Nature of problem: Derivation and use of perturbative Feynman rules for complicated lattice QCD actions. Solution method: An automated expansion method implemented in Python (HiPPy) and code to use expansions to generate Feynman rules in Fortran95 (HPsrc). Restrictions: No general restrictions. Specific restrictions are discussed in the text. Additional comments: The HiPPy and HPsrc codes are released under the second version of the GNU General Public Licence (GPL v2). Therefore anyone is

  1. Low- and high-order accurate boundary conditions: From Stokes to Darcy porous flow modeled with standard and improved Brinkman lattice Boltzmann schemes

    NASA Astrophysics Data System (ADS)

    Silva, Goncalo; Talon, Laurent; Ginzburg, Irina

    2017-04-01

    The present contribution focuses on the accuracy of reflection-type boundary conditions in the Stokes-Brinkman-Darcy modeling of porous flows solved with the lattice Boltzmann method (LBM), which we operate with the two-relaxation-time (TRT) collision and the Brinkman-force based scheme (BF), called BF-TRT scheme. In parallel, we compare it with the Stokes-Brinkman-Darcy linear finite element method (FEM) where the Dirichlet boundary conditions are enforced on grid vertices. In bulk, both BF-TRT and FEM share the same defect: in their discretization a correction to the modeled Brinkman equation appears, given by the discrete Laplacian of the velocity-proportional resistance force. This correction modifies the effective Brinkman viscosity, playing a crucial role in the triggering of spurious oscillations in the bulk solution. While the exact form of this defect is available in lattice-aligned, straight or diagonal, flows; in arbitrary flow/lattice orientations its approximation is constructed. At boundaries, we verify that such a Brinkman viscosity correction has an even more harmful impact. Already at the first order, it shifts the location of the no-slip wall condition supported by traditional LBM boundary schemes, such as the bounce-back rule. For that reason, this work develops a new class of boundary schemes to prescribe the Dirichlet velocity condition at an arbitrary wall/boundary-node distance and that supports a higher order accuracy in the accommodation of the TRT-Brinkman solutions. For their modeling, we consider the standard BF scheme and its improved version, called IBF; this latter is generalized in this work to suppress or to reduce the viscosity correction in arbitrarily oriented flows. Our framework extends the one- and two-point families of linear and parabolic link-wise boundary schemes, respectively called B-LI and B-MLI, which avoid the interference of the Brinkman viscosity correction in their closure relations. The performance of LBM and FEM

  2. ASSESSMENT FORM - NEW IMPROVEMENT OF ACTIONS: CONCENTRATION AND RESEARCH AREAS / CURRICULUM STRUCTURE / FUNDRAISING.

    PubMed

    Calderon, Iracema Mp

    2015-01-01

    This review aims to develop a critical and current analysis of the basic structure of a Postgraduate program for proposing improvement actions and new evaluation criteria. To examine the items that are areas of concentration (AC), research lines (LP), research projects (PP), curricular structure and fundraising were consulted the Area Document, the 2013 Evaluation Report and the Assessment Sheets of Medicine III programs, evaluated in the 2010-2012 period. Consistency is recommended especially among AC, LP and PP, with genuine link between activities and permanent teachers skills and based on structured curriculum in the education of the student. The Program Proposal interfere, and much, in qualifying a program. The curriculum should provide subsidy to the formation of the researcher, through the core subjects, and development of PP, being the concept of disciplines to support lines and research projects. Fundraise should be set out in research projects and in the CV-Lattes. The area recommended that at least 40-50% of permanent teachers present fundraising and the minimum 20-25% of these teachers to have productivity scholarship PQ / CNPq during the triennium. It is necessary to promote wide discussion and find a consensus denominator for these issues. The actions should contribute to the improvement of evaluation forms and certainly for the qualification of the programs but graduate. Essa revisão tem como objetivo elaborar uma análise crítica e atual da estrutura básica de um programa de Pós-Graduação para a proposição de ações de aperfeiçoamento e novos critérios de avaliação. Para analisarem-se os itens áreas de concentração (AC), linhas de pesquisa (LP), projetos de pesquisa (PP), estrutura curricular e captação de recursos/fomentos foram consultados o documento de área, o relatório de avaliação 2013 e as fichas de avaliação dos programas da Medicina III, avaliados no triênio 2010-2012. A coerência é recomendada especialmente entre

  3. Encoding of High Frequencies Improves with Maturation of Action Potential Generation in Cultured Neocortical Neurons

    PubMed Central

    Nikitin, Evgeny S.; Bal, Natalia V.; Malyshev, Aleksey; Ierusalimsky, Victor N.; Spivak, Yulia; Balaban, Pavel M.; Volgushev, Maxim

    2017-01-01

    The ability of neocortical neurons to detect and encode rapid changes at their inputs is crucial for basic neuronal computations, such as coincidence detection, precise synchronization of activity and spike-timing dependent plasticity. Indeed, populations of cortical neurons can respond to subtle changes of the input very fast, on a millisecond time scale. Theoretical studies and model simulations linked the encoding abilities of neuronal populations to the fast onset dynamics of action potentials (APs). Experimental results support this idea, however mechanisms of fast onset of APs in cortical neurons remain elusive. Studies in neuronal cultures, that are allowing for accurate control over conditions of growth and microenvironment during the development of neurons and provide better access to the spike initiation zone, may help to shed light on mechanisms of AP generation and encoding. Here we characterize properties of AP encoding in neocortical neurons grown for 11–25 days in culture. We show that encoding of high frequencies improves upon culture maturation, which is accompanied by the development of passive electrophysiological properties and AP generation. The onset of APs becomes faster with culture maturation. Statistical analysis using correlations and linear model approaches identified the onset dynamics of APs as a major predictor of age-dependent changes of encoding. Encoding of high frequencies strongly correlated also with the input resistance of neurons. Finally, we show that maturation of encoding properties of neurons in cultures is similar to the maturation of encoding in neurons studied in slices. These results show that maturation of AP generators and encoding is, to a large extent, determined genetically and takes place even without normal micro-environment and activity of the whole brain in vivo. This establishes neuronal cultures as a valid experimental model for studying mechanisms of AP generation and encoding, and their maturation. PMID

  4. How Schools Are Using Action Research on Practical Work, New Technologies and Research and Development to Improve Student Outcomes

    ERIC Educational Resources Information Center

    Davenport, Carol

    2013-01-01

    Three methods from different schools illustrate how the cyclic process of action research can be used to develop teaching skills. The importance of learning from successful and unsuccessful lessons or parts of lessons is emphasised as the basis for development and improvement. This process can be carried out on an individual basis but development…

  5. Story Telling: Research and Action to Improve 6th Grade Students' Views about Certain Aspects of Nature of Science

    ERIC Educational Resources Information Center

    Kahraman, Feray; Karatas, Faik Özgür

    2015-01-01

    This study is a four-week section of ongoing attempts that aim to improve 6th grade students' understandings of the nature of science. The study was carried out in a sixth grade science and technology class at a rural middle school with 15 students on the basis of action research methodology. During the study, four different stories based on the…

  6. The Implementation of Action Research for the Improvement of Biology Teaching and Learning in Senior Secondary Schools in Nigeria

    ERIC Educational Resources Information Center

    Udeani, U. N.; Atagana, H. I.; Esiobu, G. O.

    2016-01-01

    The main objective of the study was to implement an action research strategy to improve the teaching and learning of biology in senior secondary schools in Nigeria. Specifically the following research questions were raised: (1) What are the levels of intellectual challenge included in the activities used for classroom and laboratory instructions?…

  7. Leading School-Wide Improvement in Low-Performing Schools Facing Conditions of Accountability: Key Actions and Considerations

    ERIC Educational Resources Information Center

    Cosner, Shelby; Jones, Mary F.

    2016-01-01

    Purpose: The purpose of this paper is to advance a framework that identifies three key domains of work and a set of more nuanced considerations and actions within each domain for school leaders seeking to improve school-wide student learning in low-performing schools facing conditions of accountability. Design/methodology/approach: Review of…

  8. Story Telling: Research and Action to Improve 6th Grade Students' Views about Certain Aspects of Nature of Science

    ERIC Educational Resources Information Center

    Kahraman, Feray; Karatas, Faik Özgür

    2015-01-01

    This study is a four-week section of ongoing attempts that aim to improve 6th grade students' understandings of the nature of science. The study was carried out in a sixth grade science and technology class at a rural middle school with 15 students on the basis of action research methodology. During the study, four different stories based on the…

  9. Action Plan To Improve Access to Child Care Assistance for Low-Income Families in the South.

    ERIC Educational Resources Information Center

    Southern Inst. on Children and Families, Columbia, SC.

    The report details an action plan developed by the Southern Regional Task Force on Child Care, comprised of appointees from 16 southern states including Oklahoma and the mayor of the District of Columbia, with additional appointees from the other agencies. The charge to the task force was to develop a plan to improve access to child care…

  10. Affirmative Action Plan for Improvement of Equal Opportunities for Members of Minority Groups, Women, and Physically Handicapped.

    ERIC Educational Resources Information Center

    Black Hawk Coll., Moline, IL.

    This document presents the affirmative action plan developed by Black Hawk College to assure the development and maintenance of educational programs, services, and employment practices that are sensitive to the needs of minorities, women, and the physically handicapped. Part I deals with employment, outlining a specific plan for improving equal…

  11. The Positive Action Program: Improving Academics, Behavior, and Character by Teaching Comprehensive Skills for Successful Learning and Living

    ERIC Educational Resources Information Center

    Flay, Brian R.; Allred, Carol G.

    2010-01-01

    This chapter outlines and provides evidence for the effects of the "Positive Action Program" as a way of inculcating values, driving student wellbeing, and improving academic performance and interpersonal behavior. The program centers on addressing behavioral, emotional, and academic problems by developing in individuals positive beliefs…

  12. Southern Regional Action Plan To Improve the Quality of Early Care and Education. Southern Regional Task Force on Child Care.

    ERIC Educational Resources Information Center

    Southern Inst. on Children and Families, Columbia, SC.

    This booklet presents the action plan developed by the Southern Regional Task Force on Child Care for improving the quality of early care and education (ECE) in southern states. Also included in the booklet are tables that represent data collected from 16 participating states and the District of Columbia on state child care quality standards and…

  13. The Positive Action Program: Improving Academics, Behavior, and Character by Teaching Comprehensive Skills for Successful Learning and Living

    ERIC Educational Resources Information Center

    Flay, Brian R.; Allred, Carol G.

    2010-01-01

    This chapter outlines and provides evidence for the effects of the "Positive Action Program" as a way of inculcating values, driving student wellbeing, and improving academic performance and interpersonal behavior. The program centers on addressing behavioral, emotional, and academic problems by developing in individuals positive beliefs…

  14. Class Action: Improving School Performance in the Developing World through Better Health and Nutrition. Directions in Development.

    ERIC Educational Resources Information Center

    Del Rosso, Joy Miller; Marek, Tonia

    This book summarizes how better nutrition and health for youths in developing nations will enhance: (1) school enrollment, attendance, and performance; (2) economic productivity; and (3) the health of future generations. By discussing the many low-cost and highly efficient actions that can improve school-age children's health and nutrition, this…

  15. Leading School-Wide Improvement in Low-Performing Schools Facing Conditions of Accountability: Key Actions and Considerations

    ERIC Educational Resources Information Center

    Cosner, Shelby; Jones, Mary F.

    2016-01-01

    Purpose: The purpose of this paper is to advance a framework that identifies three key domains of work and a set of more nuanced considerations and actions within each domain for school leaders seeking to improve school-wide student learning in low-performing schools facing conditions of accountability. Design/methodology/approach: Review of…

  16. Action video game playing is associated with improved visual sensitivity, but not alterations in visual sensory memory.

    PubMed

    Appelbaum, L Gregory; Cain, Matthew S; Darling, Elise F; Mitroff, Stephen R

    2013-08-01

    Action video game playing has been experimentally linked to a number of perceptual and cognitive improvements. These benefits are captured through a wide range of psychometric tasks and have led to the proposition that action video game experience may promote the ability to extract statistical evidence from sensory stimuli. Such an advantage could arise from a number of possible mechanisms: improvements in visual sensitivity, enhancements in the capacity or duration for which information is retained in visual memory, or higher-level strategic use of information for decision making. The present study measured the capacity and time course of visual sensory memory using a partial report performance task as a means to distinguish between these three possible mechanisms. Sensitivity measures and parameter estimates that describe sensory memory capacity and the rate of memory decay were compared between individuals who reported high evels and low levels of action video game experience. Our results revealed a uniform increase in partial report accuracy at all stimulus-to-cue delays for action video game players but no difference in the rate or time course of the memory decay. The present findings suggest that action video game playing may be related to enhancements in the initial sensitivity to visual stimuli, but not to a greater retention of information in iconic memory buffers.

  17. Improved AOAC First Action 2011.08 for the Analysis of Vitamin B₁₂ in Infant Formula and Adult/Pediatric Formulas: First Action 2014.02.

    PubMed

    Giménez, Esther Campos

    2014-01-01

    This report documents improvement and single-laboratory validation performed on AOAC First Action Method 2011.08 for vitamin B12 in infant formula and adult/pediatric nutritional formula. The original validation study included a range of fortified products, from infant formulas to breakfast cereals or beverages. Extended validation data, including additional infant formulas and adult/pediatric nutritionals, has now been produced. In addition, the method has been modified to use ultra-HPLC and the calibration range extended in a multilevel calibration curve. Detection and quantification limits were also improved by increasing the sample weight used for analysis and the reconstitution rate adapted to the requirements. The Stakeholder Panel on Infant Formula and Adult Nutritionals Test Material Kit, designed to represent a large range of products within the category (infant formula and adult nutritionals made from any combination of milk, soy, rice, whey, hydrolyzed protein, starch, and amino acids, with and without intact protein), was used to determine performance characteristics of the method. The modifications included allow now full compliance with standard method performance requirements established for vitamin B12 (SMPR 2011.005). LOQ was ≤0.01 μg/100 g, working range between 0.01 and 5.0 μg/100 g, repeatability ≤7%, and recovery in the range 90-110%. The method was granted AOAC First Action status 2014.02.

  18. Army Needs to Improve Processes Over Government-Furnished Material Inventory Actions

    DTIC Science & Technology

    2015-05-21

    Processes Over Government‑Furnished Material Inventory Actions Visit us at www.dodig.mil Objective We determined whether the Logistics Modernization ... Modernization Program (LMP) system correctly recorded Army inventory actions for Government-furnished material (GFM) in the general ledger accounts and...Government property 5 DoD IG Report No. D-2011-015, “Insufficient Governance Over Logistics Modernization Program System Development,” November 2, 2010

  19. γ-Aminobutyric acid (GABA) administration improves action selection processes: a randomised controlled trial

    PubMed Central

    Steenbergen, Laura; Sellaro, Roberta; Stock, Ann-Kathrin; Beste, Christian; Colzato, Lorenza S.

    2015-01-01

    In order to accomplish a task goal, real-life environments require us to develop different action control strategies in order to rapidly react to fast-moving visual and auditory stimuli. When engaging in complex scenarios, it is essential to prioritise and cascade different actions. Recent studies have pointed to an important role of the gamma-aminobutyric acid (GABA)-ergic system in the neuromodulation of action cascading. In this study we assessed the specific causal role of the GABA-ergic system in modulating the efficiency of action cascading by administering 800 mg of synthetic GABA or 800 mg oral of microcrystalline cellulose (placebo). In a double-blind, randomised, between-group design, 30 healthy adults performed a stop-change paradigm. Results showed that the administration of GABA, compared to placebo, increased action selection when an interruption (stop) and a change towards an alternative response were required simultaneously, and when such a change had to occur after the completion of the stop process. These findings, involving the systemic administration of synthetic GABA, provide the first evidence for a possible causal role of the GABA-ergic system in modulating performance in action cascading. PMID:26227783

  20. Future of Lattice Calculations with Staggered Sea Quarks

    SciTech Connect

    Gottlieb, Steven

    2011-05-23

    The MILC collaboration for some years has been creating gauge ensembles with 2+1 flavors of asqtad or improved staggered quarks. There are some 40 ensembles covering a wide range of quark mass and lattice spacing, thus allowing control of the chiral and continuum limits. An extensive review of that program has been published in Reviews of Modern Physics. Recently, MILC has begun a new program using HPQCD's highly improved staggered quark (HISQ) action. This action has smaller taste symmetry breaking than asqtad and improved scaling properties. We also include a dynamical charm quark in these calculations. We summarize the achievements of the asqtad program, what has been done so far with HISQ quarks, and then consider what future ensembles will be created and their impact.

  1. Nonequivalent periodic subsets of the lattice.

    PubMed

    Cocke, W

    2013-07-01

    The use of Pólya's theorem in crystallography and other applications has greatly simplified many counting and coloring problems. Given a group of equivalences acting on a set, Pólya's theorem equates the number of unique subsets with the orbits of the group action. For a lattice and a given group of periodic equivalences, the number of nonequivalent subsets of the lattice can be solved using Pólya's counting on the group of relevant symmetries acting on the lattice. When equivalence is defined via a sublattice, the use of Pólya's theorem is equivalent to knowing the cycle index of the action of the group elements on a related finite group structure. A simple algebraic method is presented to determine the cycle index for a group element acting on a lattice subject to certain periodicity arguments.

  2. Short-distance matrix elements for $D$-meson mixing for 2+1 lattice QCD

    SciTech Connect

    Chang, Chia Cheng

    2015-01-01

    We study the short-distance hadronic matrix elements for D-meson mixing with partially quenched Nf = 2+1 lattice QCD. We use a large set of the MIMD Lattice Computation Collaboration's gauge configurations with a2 tadpole-improved staggered sea quarks and tadpole-improved Lüscher-Weisz gluons. We use the a2 tadpole-improved action for valence light quarks and the Sheikoleslami-Wohlert action with the Fermilab interpretation for the valence charm quark. Our calculation covers the complete set of five operators needed to constrain new physics models for D-meson mixing. We match our matrix elements to the MS-NDR scheme evaluated at 3 GeV. We report values for the Beneke-Buchalla-Greub-Lenz-Nierste choice of evanescent operators.

  3. Ruby laser-assisted depilation: The mode of action and potential ways of improved outcome

    NASA Astrophysics Data System (ADS)

    Topping, Adam Partington

    Aim - To improve efficacy and lessen side effects resulting from normal mode ruby laser (NMRL)-assisted depilation via a greater understanding of its mode of action and the development of novel methods of reducing associated epidermal damage. Employing a thermal imaging camera and ex vivo hair-bearing skin, the targets for the NMRL (pulse duration 900 musec and spot size 7 mm) were defined, the temperatures reached and the heat dissipation rates determined. Production of heat was confined to the hair follicles, with the peak temperatures reached varying considerably between hairs within the same treatment area and also between individuals. Histological assessment for a known indicator of cellular damage (p53 expression) identified the sites and extent of damage, which correlated with the peak temperatures measured. An energy meter was used to detect the penetration of NMRL light through ex vivo skin, which was found to be deeper than previously theorised. The black-haired mouse (C57B1/10) was assessed both macroscopically and histologically and found to be an acceptable animal model of NMRL depilation and associated epidermal damage. Attempts to reduce the epidermal damage by simply stopping the light reaching the epidermis using a chromophore block were assessed. Chromophore did indeed reduce the amount of epidermal damage detected in laser-irradiated ex vivo human skin, whereas in contrast it increased the wounding seen in the much thinner skin of the mouse. Nevertheless the mouse model showed that this technique did not affect the depilation efficacy. An alternative method of reducing epidermal damage using induction of the cells' intrinsic protective mechanisms (heat shock proteins, HSP) was assessed using cultured keratinocytes and the mouse model. Primarily, the sub-lethal temperature optimum for HSP expression in human keratinocytes was determined, then an in vitro model of NMRL-associated epidermal damage was established and the heat pre-treatment assessed

  4. Quenched domain wall QCD with DBW2 gauge action toward nucleon decay matrix element calculation

    NASA Astrophysics Data System (ADS)

    Aoki, Yasumichi

    2001-10-01

    The domain wall fermion action is a promising way to control chiral symmetry in lattice gauge theory. By the good chiral symmetry of this approach even at finite lattice spacing, one is able to extract hadronic matrix elements, like kaon weak matrix elements, for which the symmetry is extremely important. Ordinary fermions with poor chiral symmetry make calculation difficult because of the large mixing of operators with different chiral structure. Even though the domain wall fermion action with the simple Wilson gauge action has a good chiral symmetry, one can further improve the symmetry by using a different gauge action. We take a non-perturbatively improved action, the DBW2 action of the QCD Taro group. Hadron masses are systematically examined for a range of parameters. Application to nucleon decay matrix element is also discussed.

  5. Designing quality improvement initiatives: the action effect method, a structured approach to identifying and articulating programme theory.

    PubMed

    Reed, Julie E; McNicholas, Christopher; Woodcock, Thomas; Issen, Laurel; Bell, Derek

    2014-12-01

    The identification and articulation of programme theory can support effective design, execution and evaluation of quality improvement (QI) initiatives. Programme theory includes an agreed aim, potential interventions to achieve this aim, anticipated cause/effect relationships between the interventions and the aim and measures to monitor improvement. This paper outlines the approach used in a research and improvement programme to support QI initiatives in identifying and articulating programme theory: the action effect method. Building on a previously used QI method, the driver diagram, the action effect method was developed using co-design and iteration over four annual rounds of improvement initiatives. This resulted in a specification of the elements required to fully articulate the programme theory of a QI initiative. The action effect method is a systematic and structured process to identify and articulate a QI initiative's programme theory. The method connects potential interventions and implementation activities with an overall improvement aim through a diagrammatic representation of hypothesised and evidenced cause/effect relationships. Measure concepts, in terms of service delivery and patient and system outcomes, are identified to support evaluation. The action effect method provides a framework to guide the execution and evaluation of a QI initiative, a focal point for other QI methods and a communication tool to engage stakeholders. A clear definition of what constitutes a well-articulated programme theory is provided to guide the use of the method and assessment of the fidelity of its application. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

  6. Improved outcomes in auditory brainstem implantation with the use of near-field electrical compound action potentials.

    PubMed

    Mandalà, Marco; Colletti, Liliana; Colletti, Giacomo; Colletti, Vittorio

    2014-12-01

    To compare the outcomes (auditory threshold and open-set speech perception at 48-month follow-up) of a new near-field monitoring procedure, electrical compound action potential, on positioning the auditory brainstem implant electrode array on the surface of the cochlear nuclei versus the traditional far-field electrical auditory brainstem response. Retrospective study. Tertiary referral center. Among the 202 patients with auditory brainstem implants fitted and monitored with electrical auditory brainstem response during implant fitting, 9 also underwent electrical compound action potential recording. These subjects were matched retrospectively with a control group of 9 patients in whom only the electrical auditory brainstem response was recorded. Electrical compound action potentials were obtained using a cotton-wick recording electrode located near the surface of the cochlear nuclei and on several cranial nerves. Significantly lower potential thresholds were observed with the recording electrode located on the cochlear nuclei surface compared with the electrical auditory brainstem response (104.4 ± 32.5 vs 158.9 ± 24.2, P = .0030). Electrical brainstem response and compound action potentials identified effects on the neighboring cranial nerves on 3.2 ± 2.4 and 7.8 ± 3.2 electrodes, respectively (P = .0034). Open-set speech perception outcomes at 48-month follow-up had improved significantly in the near- versus far-field recording groups (78.9% versus 56.7%; P = .0051). Electrical compound action potentials during auditory brainstem implantation significantly improved the definition of the potential threshold and the number of auditory and extra-auditory waves generated. It led to the best coupling between the electrode array and cochlear nuclei, significantly improving the overall open-set speech perception. © American Academy of Otolaryngology—Head and Neck Surgery Foundation 2014.

  7. Enhanced Mitochondrial Superoxide Scavenging Does Not Improve Muscle Insulin Action in the High Fat-Fed Mouse

    PubMed Central

    Lark, Daniel S.; Kang, Li; Lustig, Mary E.; Bonner, Jeffrey S.; James, Freyja D.; Neufer, P. Darrell; Wasserman, David H.

    2015-01-01

    Improving mitochondrial oxidant scavenging may be a viable strategy for the treatment of insulin resistance and diabetes. Mice overexpressing the mitochondrial matrix isoform of superoxide dismutase (sod2tg mice) and/or transgenically expressing catalase within the mitochondrial matrix (mcattg mice) have increased scavenging of O2˙ˉ and H2O2, respectively. Furthermore, muscle insulin action is partially preserved in high fat (HF)-fed mcattg mice. The goal of the current study was to test the hypothesis that increased O2˙ˉ scavenging alone or in combination with increased H2O2 scavenging (mtAO mice) enhances in vivo muscle insulin action in the HF-fed mouse. Insulin action was examined in conscious, unrestrained and unstressed wild type (WT), sod2tg, mcattg and mtAO mice using hyperinsulinemic-euglycemic clamps (insulin clamps) combined with radioactive glucose tracers following sixteen weeks of normal chow or HF (60% calories from fat) feeding. Glucose infusion rates, whole body glucose disappearance, and muscle glucose uptake during the insulin clamp were similar in chow- and HF-fed WT and sod2tg mice. Consistent with our previous work, HF-fed mcattg mice had improved muscle insulin action, however, an additive effect was not seen in mtAO mice. Insulin-stimulated Akt phosphorylation in muscle from clamped mice was consistent with glucose flux measurements. These results demonstrate that increased O2˙ˉ scavenging does not improve muscle insulin action in the HF-fed mouse alone or when coupled to increased H2O2 scavenging. PMID:25992608

  8. Enhanced mitochondrial superoxide scavenging does not improve muscle insulin action in the high fat-fed mouse.

    PubMed

    Lark, Daniel S; Kang, Li; Lustig, Mary E; Bonner, Jeffrey S; James, Freyja D; Neufer, P Darrell; Wasserman, David H

    2015-01-01

    Improving mitochondrial oxidant scavenging may be a viable strategy for the treatment of insulin resistance and diabetes. Mice overexpressing the mitochondrial matrix isoform of superoxide dismutase (sod2(tg) mice) and/or transgenically expressing catalase within the mitochondrial matrix (mcat(tg) mice) have increased scavenging of O2(˙-) and H2O2, respectively. Furthermore, muscle insulin action is partially preserved in high fat (HF)-fed mcat(tg) mice. The goal of the current study was to test the hypothesis that increased O2(˙-) scavenging alone or in combination with increased H2O2 scavenging (mtAO mice) enhances in vivo muscle insulin action in the HF-fed mouse. Insulin action was examined in conscious, unrestrained and unstressed wild type (WT), sod2(tg), mcat(tg) and mtAO mice using hyperinsulinemic-euglycemic clamps (insulin clamps) combined with radioactive glucose tracers following sixteen weeks of normal chow or HF (60% calories from fat) feeding. Glucose infusion rates, whole body glucose disappearance, and muscle glucose uptake during the insulin clamp were similar in chow- and HF-fed WT and sod2(tg) mice. Consistent with our previous work, HF-fed mcat(tg) mice had improved muscle insulin action, however, an additive effect was not seen in mtAO mice. Insulin-stimulated Akt phosphorylation in muscle from clamped mice was consistent with glucose flux measurements. These results demonstrate that increased O2(˙-) scavenging does not improve muscle insulin action in the HF-fed mouse alone or when coupled to increased H2O2 scavenging.

  9. Comment on "An improved gray Lattice Boltzmann model for simulating fluid flow in multi-scale porous media": Intrinsic links between LBE Brinkman schemes

    NASA Astrophysics Data System (ADS)

    Ginzburg, Irina

    2016-02-01

    In this Comment on the recent work (Zhu and Ma, 2013) [11] by Zhu and Ma (ZM) we first show that all three local gray Lattice Boltzmann (GLB) schemes in the form (Zhu and Ma, 2013) [11]: GS (Chen and Zhu, 2008; Gao and Sharma, 1994) [1,4], WBS (Walsh et al., 2009) [12] and ZM, fail to get constant Darcy's velocity in series of porous blocks. This inconsistency is because of their incorrect definition of the macroscopic velocity in the presence of the heterogeneous momentum exchange, while the original WBS model (Walsh et al., 2009) [12] does this properly. We improve the GS and ZM schemes for this and other related deficiencies. Second, we show that the ;discontinuous velocity; they recover on the stratified interfaces with their WBS scheme is inherent, in different degrees, to all LBE Brinkman schemes, including ZM scheme. None of them guarantees the stress and the velocity continuity by their implicit interface conditions, even in the frame of the two-relaxation-times (TRT) collision operator where these two properties are assured in stratified Stokes flow, Ginzburg (2007) [5]. Third, the GLB schemes are presented in work (Zhu and Ma, 2013) [11] as the alternative ones to direct, Brinkman-force based (BF) schemes (Freed, 1998; Nie and Martys, 2007) [3,8]. Yet, we show that the BF-TRT scheme (Ginzburg, 2008) [6] gets the solutions of any of the improved GLB schemes for specific, viscosity-dependent choice of its one or two local relaxation rates. This provides the principal difference between the GLB and BF: while the BF may respect the linearity of the Stokes-Brinkman equation rigorously, the GLB-TRT cannot, unless it reduces to the BF via the inverse transform of the relaxation rates. Furthermore, we show that, in limited parameter space, ;gray; schemes may run one another. From the practical point of view, permeability values obtained with the GLB are viscosity-dependent, unlike with the BF. Finally, the GLB shares with the BF a so-called anisotropy (Ginzburg

  10. Analysis and improvement of Brinkman lattice Boltzmann schemes: Bulk, boundary, interface. Similarity and distinctness with finite elements in heterogeneous porous media

    NASA Astrophysics Data System (ADS)

    Ginzburg, Irina; Silva, Goncalo; Talon, Laurent

    2015-02-01

    This work focuses on the numerical solution of the Stokes-Brinkman equation for a voxel-type porous-media grid, resolved by one to eight spacings per permeability contrast of 1 to 10 orders in magnitude. It is first analytically demonstrated that the lattice Boltzmann method (LBM) and the linear-finite-element method (FEM) both suffer from the viscosity correction induced by the linear variation of the resistance with the velocity. This numerical artefact may lead to an apparent negative viscosity in low-permeable blocks, inducing spurious velocity oscillations. The two-relaxation-times (TRT) LBM may control this effect thanks to free-tunable two-rates combination Λ . Moreover, the Brinkman-force-based BF-TRT schemes may maintain the nondimensional Darcy group and produce viscosity-independent permeability provided that the spatial distribution of Λ is fixed independently of the kinematic viscosity. Such a property is lost not only in the BF-BGK scheme but also by "partial bounce-back" TRT gray models, as shown in this work. Further, we propose a consistent and improved IBF-TRT model which vanishes viscosity correction via simple specific adjusting of the viscous-mode relaxation rate to local permeability value. This prevents the model from velocity fluctuations and, in parallel, improves for effective permeability measurements, from porous channel to multidimensions. The framework of our exact analysis employs a symbolic approach developed for both LBM and FEM in single and stratified, unconfined, and bounded channels. It shows that even with similar bulk discretization, BF, IBF, and FEM may manifest quite different velocity profiles on the coarse grids due to their intrinsic contrasts in the setting of interface continuity and no-slip conditions. While FEM enforces them on the grid vertexes, the LBM prescribes them implicitly. We derive effective LBM continuity conditions and show that the heterogeneous viscosity correction impacts them, a property also shared

  11. Analysis and improvement of Brinkman lattice Boltzmann schemes: bulk, boundary, interface. Similarity and distinctness with finite elements in heterogeneous porous media.

    PubMed

    Ginzburg, Irina; Silva, Goncalo; Talon, Laurent

    2015-02-01

    This work focuses on the numerical solution of the Stokes-Brinkman equation for a voxel-type porous-media grid, resolved by one to eight spacings per permeability contrast of 1 to 10 orders in magnitude. It is first analytically demonstrated that the lattice Boltzmann method (LBM) and the linear-finite-element method (FEM) both suffer from the viscosity correction induced by the linear variation of the resistance with the velocity. This numerical artefact may lead to an apparent negative viscosity in low-permeable blocks, inducing spurious velocity oscillations. The two-relaxation-times (TRT) LBM may control this effect thanks to free-tunable two-rates combination Λ. Moreover, the Brinkman-force-based BF-TRT schemes may maintain the nondimensional Darcy group and produce viscosity-independent permeability provided that the spatial distribution of Λ is fixed independently of the kinematic viscosity. Such a property is lost not only in the BF-BGK scheme but also by "partial bounce-back" TRT gray models, as shown in this work. Further, we propose a consistent and improved IBF-TRT model which vanishes viscosity correction via simple specific adjusting of the viscous-mode relaxation rate to local permeability value. This prevents the model from velocity fluctuations and, in parallel, improves for effective permeability measurements, from porous channel to multidimensions. The framework of our exact analysis employs a symbolic approach developed for both LBM and FEM in single and stratified, unconfined, and bounded channels. It shows that even with similar bulk discretization, BF, IBF, and FEM may manifest quite different velocity profiles on the coarse grids due to their intrinsic contrasts in the setting of interface continuity and no-slip conditions. While FEM enforces them on the grid vertexes, the LBM prescribes them implicitly. We derive effective LBM continuity conditions and show that the heterogeneous viscosity correction impacts them, a property also shared

  12. Improving Attainment through Action Research: An Introduction to Hillingdon's Raising Achievement Project.

    ERIC Educational Resources Information Center

    Irshad, Khalid; Imrie, Jean

    1997-01-01

    Describes the Raising Achievement Project designed to address the need for more information on the performance of ethnic minorities for whom English is an additional language, and the need for support for children who have passed the initial stages of learning English. It also describes the action research model used to answer questions about…

  13. 77 FR 17565 - Notice of Final Federal Agency Actions on Proposed Transportation Improvements in Utah

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-26

    ... South to northbound 200 West; (11) relocates the Jordan and Salt Lake City Canal or place it in a pipe; (12) relocates utilities (fiber optic and drainage features) along Bangerter Highway; (13) includes stormwater drainage and passive water quality treatment. The actions by the FHWA and other Federal agencies...

  14. Using Action Research to Teach Students to Manage Team Learning and Improve Teamwork Satisfaction

    ERIC Educational Resources Information Center

    Scott-Ladd, Brenda; Chan, Christopher C. A.

    2008-01-01

    This article reports on a study investigating strategies that students can use to develop skills in managing team learning. Two groups of second-year management students participated in a semester-long action research project over two semesters. The students were educated on team development, team processes and conflict management and how to…

  15. Students as Researchers: A Framework for Using Action Research Principles to Improve Instruction

    ERIC Educational Resources Information Center

    Rose, Linda P.

    2009-01-01

    Many instructors teach courses that prepare students to do research individually or in teams. These instructors also supervise their students' research projects. Continuous and systematic use of action research principles can help instructors prepare for problems that may develop when students encounter unfamiliar issues at research sites due to…

  16. Youth Participatory Action Research and School Improvement: The Missing Voices of Black Youth in Montreal

    ERIC Educational Resources Information Center

    Livingstone, Anne-Marie; Celemencki, Jacqueline; Calixte, Melissa

    2014-01-01

    The article discusses the implementation and results of a youth participatory action research (YPAR) project carried out with black high school students in 2009 and 2010 in Montreal, QC. The aim of the project was to involve black youth in studying the factors that either enhance or impede their success in school and thereby have them identify…

  17. Report: EPA Has Implemented Corrective Actions to Improve Conditions at Asheville, North Carolina Superfund Site

    EPA Pesticide Factsheets

    Report #12-P-0362, March 21, 2012. Region 4 took actions to implement all recommendations made in EPA OIG Report No. 10-P-0130, EPA Activities Provide Limited Assurance of the Extent of Contamination and Risk at a North Carolina Hazardous Waste Site.

  18. Moving Forward: Southern States Take Action To Improve Access to Quality, Affordable Child Care.

    ERIC Educational Resources Information Center

    Southern Inst. on Children and Families, Columbia, SC.

    The Southern Regional Initiative on Child Care (established by the Southern Institute on Children and Families) is guided by the Southern Regional Task Force on Child Care including representatives from 16 southern states and the District of Columbia. The initial charge from the Task Force was to develop a southern regional action plan to improve…

  19. Defense Transportation: DOD Needs to Take Actions to Improve the Transportation of Hazardous Material Shipments

    DTIC Science & Technology

    2014-05-01

    guidance, which can adversely affect the safe, timely, and cost- effective transportation of HAZMAT. For example, GAO found the following: • Improper...Adversely Affect the Safe, Timely, and Cost-Effective Transportation of HAZMAT 17 Conclusions 30 Recommendations for Executive Action 31 Agency...of Improperly Packaged, Rusted Acetylene Gas Cylinders Delayed in Transport 19 Contents Page ii GAO-14-375 Defense

  20. Teacher Action Research: The Impact of Inquiry on Curriculum Improvement and Professional Development.

    ERIC Educational Resources Information Center

    Berlin, Donna F.

    The Berlin-White Action Research Model (BWARM) described here was designed to prepare and support teachers in the development, implementation, and evaluation of innovation within their classroom. The year-long program consists of three interrelated phases over four academic quarters: (1) "Pedagogical Awareness," designed to provide knowledge and…

  1. Using the Theory of Reasoned Action to Improve the Understanding of Recreation Behavior.

    ERIC Educational Resources Information Center

    Young, Robert A.; Kent, Anne T.

    1985-01-01

    Using the theory of reasoned action, 100 residents of a small Midwestern city were questioned about intentions to camp, attitudes and beliefs about camping, and influences of "important others" in making decisions to camp. The study results demonstrate that the theory may be useful in predicting behavior and understanding the…

  2. "Science Talks" in Kindergarten Classrooms: Improving Classroom Practice through Collaborative Action Research

    ERIC Educational Resources Information Center

    Zhang, Meilan; Passalacqua, Susan; Lundeberg, Mary; Koehler, Matthew J.; Eberhardt, Jan; Parker, Joyce; Urban-Lurain, Mark; Zhang, Tianyi; Paik, Sunhee

    2010-01-01

    In this study we described an action research project enacted by a veteran Kindergarten teacher (Sarah) in the context of a professional development program. Over the course of a year, Sarah collaborated with other teachers in a small group to investigate how to use "Science Talks" to promote student learning in Kindergarten classrooms. A…

  3. Using Action Research to Teach Students to Manage Team Learning and Improve Teamwork Satisfaction

    ERIC Educational Resources Information Center

    Scott-Ladd, Brenda; Chan, Christopher C. A.

    2008-01-01

    This article reports on a study investigating strategies that students can use to develop skills in managing team learning. Two groups of second-year management students participated in a semester-long action research project over two semesters. The students were educated on team development, team processes and conflict management and how to…

  4. Improving Student Engagement: An Evaluation of the Latinos in Action Program

    ERIC Educational Resources Information Center

    Enriquez, Jose E.

    2012-01-01

    Hispanic students make up 12% of the enrollment in Utah elementary and secondary schools but only 3.4% of the enrollment at Utah's colleges and universities, according to Aleman and Rorrer (2006). The intervention Latinos in Action (LIA) seeks to increase high school completion and college graduation rates among emergent bilingual Latinos by…

  5. Action Research to Improve Youth and Adult Literacy: Empowering Learners in a Multilingual World

    ERIC Educational Resources Information Center

    Alidou, Hassana, Ed.; Glanz, Christine, Ed.

    2015-01-01

    One of the greatest challenges in education today is to adapt and respond to a linguistically and culturally diverse world, and to combat social disintegration and discrimination. Participatory and collaborative action research represents an empowering and emancipatory approach to this challenge because the "target groups" become…

  6. Reflecting on Evidence: Leaders Use Action Research to Improve Their Teacher Performance Reviews

    ERIC Educational Resources Information Center

    Piggot-Irvine, Eileen

    2015-01-01

    The paper reports on an action research (AR) project with six public high school leaders (reviewers) who volunteered to engage in an 18 month project to overcome their own defensiveness in addressing concerns with teachers (reviewees) whose performance they were evaluating. In the paper I outline how I acted as a coach in a long-term development…

  7. The Michigan Healthy School Action Tools process generates improvements in school nutrition policies and practices, and student dietary intake.

    PubMed

    Alaimo, Katherine; Oleksyk, Shannon; Golzynski, Diane; Drzal, Nick; Lucarelli, Jennifer; Reznar, Melissa; Wen, Yalu; Krabill Yoder, Karen

    2015-05-01

    The Michigan Healthy School Action Tools (HSAT) is an online self-assessment and action planning process for schools seeking to improve their health policies and practices. The School Nutrition Advances Kids study, a 2-year quasi-experimental intervention with low-income middle schools, evaluated whether completing the HSAT with a facilitator assistance and small grant funding resulted in (1) improvements in school nutrition practices and policies and (2) improvements in student dietary intake. A total of 65 low-income Michigan middle schools participated in the study. The Block Youth Food Frequency Questionnaire was completed by 1,176 seventh-grade students at baseline and in eighth grade (during intervention). Schools reported nutrition-related policies and practices/education using the School Environment and Policy Survey. Schools completing the HSAT were compared to schools that did not complete the HSAT with regard to number of policy and practice changes and student dietary intake. Schools that completed the HSAT made significantly more nutrition practice/education changes than schools that did not complete the HSAT, and students in those schools made dietary improvements in fruit, fiber, and cholesterol intake. The Michigan HSAT process is an effective strategy to initiate improvements in nutrition policies and practices within schools, and to improve student dietary intake.

  8. Weighted fusion of depth and inertial data to improve view invariance for real-time human action recognition

    NASA Astrophysics Data System (ADS)

    Chen, Chen; Hao, Huiyan; Jafari, Roozbeh; Kehtarnavaz, Nasser

    2017-05-01

    This paper presents an extension to our previously developed fusion framework [10] involving a depth camera and an inertial sensor in order to improve its view invariance aspect for real-time human action recognition applications. A computationally efficient view estimation based on skeleton joints is considered in order to select the most relevant depth training data when recognizing test samples. Two collaborative representation classifiers, one for depth features and one for inertial features, are appropriately weighted to generate a decision making probability. The experimental results applied to a multi-view human action dataset show that this weighted extension improves the recognition performance by about 5% over equally weighted fusion deployed in our previous fusion framework.

  9. Improving cosmic string network simulations

    NASA Astrophysics Data System (ADS)

    Hindmarsh, Mark; Rummukainen, Kari; Tenkanen, Tuomas V. I.; Weir, David J.

    2014-08-01

    In real-time lattice simulations of cosmic strings in the Abelian Higgs model, the broken translational invariance introduces lattice artifacts; relativistic strings therefore decelerate and radiate. We introduce two different methods to construct a moving string on the lattice, and study in detail the lattice effects on moving strings. We find that there are two types of lattice artifact: there is an effective maximum speed with which a moving string can be placed on the lattice, and a moving string also slows down, with the deceleration approximately proportional to the exponential of the velocity. To mitigate this, we introduce and study an improved discretization, based on the tree-level Lüscher-Weisz action, which is found to reduce the deceleration by an order of magnitude, and to increase the string speed limit by an amount equivalent to halving the lattice spacing. The improved algorithm is expected to be very useful for 3D simulations of cosmic strings in the early Universe, where one wishes to simulate as large a volume as possible.

  10. Unmanned Aircraft Systems: Additional Actions Needed to Improve Management and Integration of DOD Efforts to Support Warfighter Needs

    DTIC Science & Technology

    2008-11-01

    Services, House of Representatives UNMANNED AIRCRAFT SYSTEMS Additional Actions Needed to Improve Management and Integration of DOD Efforts to...Armed Services, House of Representatives The Department of Defense’s (DOD) use of unmanned aircraft systems (UAS) continues to increase. In 2000...unmanned aircraft systems This is a work of the U.S. government and is not subject to copyright protection in the United States. It may be reproduced

  11. Non-perturbative renormalization of lattice operators in coordinate space

    NASA Astrophysics Data System (ADS)

    Giménez, V.; Giusti, L.; Guerriero, S.; Lubicz, V.; Martinelli, G.; Petrarca, S.; Reyes, J.; Taglienti, B.; Trevigne, E.

    2004-09-01

    We present the first numerical implementation of a non-perturbative renormalization method for lattice operators, based on the study of correlation functions in coordinate space at short Euclidean distance. The method is applied to compute the renormalization constants of bilinear quark operators for the non-perturbative O (a)-improved Wilson action in the quenched approximation. The matching with perturbative schemes, such as MS bar, is computed at the next-to-leading order in continuum perturbation theory. A feasibility study of this technique with Neuberger fermions is also presented.

  12. Improving family carers' experiences of support at the end of life by enhancing communication: an action research study.

    PubMed

    Dosser, Isabel; Kennedy, Catriona

    2014-12-01

    This paper builds on findings from phase one of a participatory action research study, which investigated support for family carers at the end of life in an acute hospital setting in Scotland, UK ( Dosser and Kennedy, 2012 ). The research presented here is the second phase of the participatory action research study, in which nursing staff from an acute hospital ward are involved in ongoing analysis of data and ideas guided by action cycles and reflection. Two key change initiatives are reported; improving nurses' communication skills and improving the environment for family carers of loved ones at the end of life within the acute hospital setting. To address these points, nurses were enrolled on a communications skills course, and a new room for family carers was integrated into the hospital. Data were analysed from interviews and questionnaires with the nurses, and from insights gathered in a reflective diary taken by the researcher. The changes implemented improved the confidence of participants in communicating with carers as well as patients and colleagues. The findings highlight practical strategies and communication issues that can potentially impact on the grief experience of family carers, such as having a safe space nearby to rest in private, away from the bedside.

  13. Action video games improve reading abilities and visual-to-auditory attentional shifting in English-speaking children with dyslexia.

    PubMed

    Franceschini, Sandro; Trevisan, Piergiorgio; Ronconi, Luca; Bertoni, Sara; Colmar, Susan; Double, Kit; Facoetti, Andrea; Gori, Simone

    2017-07-19

    Dyslexia is characterized by difficulties in learning to read and there is some evidence that action video games (AVG), without any direct phonological or orthographic stimulation, improve reading efficiency in Italian children with dyslexia. However, the cognitive mechanism underlying this improvement and the extent to which the benefits of AVG training would generalize to deep English orthography, remain two critical questions. During reading acquisition, children have to integrate written letters with speech sounds, rapidly shifting their attention from visual to auditory modality. In our study, we tested reading skills and phonological working memory, visuo-spatial attention, auditory, visual and audio-visual stimuli localization, and cross-sensory attentional shifting in two matched groups of English-speaking children with dyslexia before and after they played AVG or non-action video games. The speed of words recognition and phonological decoding increased after playing AVG, but not non-action video games. Furthermore, focused visuo-spatial attention and visual-to-auditory attentional shifting also improved only after AVG training. This unconventional reading remediation program also increased phonological short-term memory and phoneme blending skills. Our report shows that an enhancement of visuo-spatial attention and phonological working memory, and an acceleration of visual-to-auditory attentional shifting can directly translate into better reading in English-speaking children with dyslexia.

  14. Defense Management: Actions Needed to Improve Management of Air Force’s Food Transformation Initiative

    DTIC Science & Technology

    2011-07-01

    nutritional standards. 7. Improve efficiency Improve food service delivery approaches to improve efficiency. 8. Decrease costs Maintain or decrease the cost...more efficient customer flow, adding more seating capacity, and making general cosmetic upgrades. Table 4 lists the projected costs of renovations at

  15. Exotic damping ring lattices

    SciTech Connect

    Palmer, R.B.

    1987-05-01

    This paper looks at, and compares three types of damping ring lattices: conventional, wiggler lattice with finite ..cap alpha.., wiggler lattice with ..cap alpha.. = 0, and observes the attainable equilibrium emittances for the three cases assuming a constraint on the attainable longitudinal impedance of 0.2 ohms. The emittance obtained are roughly in the ratio 4:2:1 for these cases.

  16. Participatory action research (PAR): an approach for improving black women's health in rural and remote communities.

    PubMed

    Etowa, Josephine B; Bernard, Wanda Thomas; Oyinsan, Bunmi; Clow, Barbara

    2007-10-01

    Women are among the most disadvantaged members of any community, and they tend to be at greatest risk of illness. Black women are particularly vulnerable and more prone than White women to illnesses associated with social and economic deprivation, including heart disease and diabetes. They utilize preventive health services less often, and when they fall ill, the health of their families and communities typically suffers as well. This article discusses the process of doing innovative participatory action research (PAR) in southwest Nova Scotia Black communities. The effort resulted in the generation of a database, community action, and interdisciplinary analysis of the intersecting inequities that compromise the health and health care of African Canadian women, their families, and their communities. This particular research effort serves as a case study for explicating the key tenets of PAR and the barriers to and contradictions in implementing PAR in a community-academic collaborative research project.

  17. p,p'-Methoxyl-diphenyl diselenideincorporation into polymeric nanocapsules improves its antinociceptive action: Physicochemical and behavioral studies.

    PubMed

    Sari, Marcel Henrique Marcondes; Ferreira, Luana Mota; AngonesiZborowski, Vanessa; Araujo, Paulo Cesar Oliveira; Nadal, Jessica Mendes; Farago, Paulo Vitor; Cruz, Letícia; Nogueira, Cristina Wayne

    2017-09-01

    The p,p'-methoxyl-diphenyl diselenide [(OMePhSe)2] is an, organoselenium compound that elicits antinociceptive action in different, animal models of pain. However, the compound has physicochemical, Limitations that delay its clinical studies. Herein, (OMePhSe)2, nanocapsules were developed and their physicochemical properties were, analyzed using different techniques (Scanning electron microscopy with, field emissionguns, wide-angle X-ray diffractometry, fourier-transform, infrared spectroscopy, thermogravimetric analysis and differential, scanning calorimetry). The antinociceptive action of (OMePhSe)2 free or, nanoencapsulated was evaluated in an animal model of thermal nociception., The (OMePhSe)2 nanocapsules or the free compound (25mg/kg, 10ml/kg), were administered to Swiss mice by the intragastric (i.g.), intraperitoneal (i.p.) or subcutaneous (s.c.) route in a single or, repeated administration regimen. The (OMePhSe)2 nanocapsules had, spherical shape, no chemical interaction among the formulation components, and high thermal stability. Treatment with (OMePhSe)2 elicited an, antinociceptive action independent of the administration route and, regimen schedule. The (OMePhSe)2 incorporation into nanocapsules, prolonged and improved the compound antinociceptive action. The, (OMePhSe)2 antinociceptive action was influenced by the route of, administration (intragastric>intraperitoneal>subcutaneous) and by the, vehicle used (NCs>canola oil). Altogether, the current study, demonstrated that the (OMePhSe)2 nanoencapsulation increased the compound, thermal stability and the antinociceptive action in mice, suggesting that, the polymeric nanocapsules provided advantages in comparison to the free, compound form. Copyright © 2017 Elsevier B.V. All rights reserved.

  18. Improving Lethal Action: Learning and Adapting in U.S. Counterterrorism Operations

    DTIC Science & Technology

    2014-09-01

    September 2014 Dr. Jeffrey Miers Vice President Director Operations Tactic Analysis i Executive Summary The United States uses lethal...The United States uses lethal force to kill individuals it believes pose an imminent terrorist threat to its citizens and interests, as well as those...Need for Lethal Action Thirteen years ago this month, Al Qaeda struck down thousands of innocent civilians on American soil. The United States

  19. Adaptation to Climatic Hazards in the Savannah Ecosystem: Improving Adaptation Policy and Action.

    PubMed

    Yiran, Gerald A B; Stringer, Lindsay C

    2017-06-12

    People in Ghana's savannah ecosystem have historically experienced a range of climatic hazards that have affected their livelihoods. In view of current climate variability and change, and projected increases in extreme events, adaptation to climate risks is vital. Policies have been put in place to enhance adaptation across sub-Saharan Africa in accordance with international agreements. At the same time, local people, through experience, have learned to adapt. This paper examines current policy actions and their implementation alongside an assessment of barriers to local adaptation. In doing so it links adaptation policy and practice. Policy documents were analysed that covered key livelihood sectors, which were identified as climate sensitive. These included agriculture, water, housing and health policies, as well as the National Climate Change Policy. In-depth interviews and focus group discussions were also held with key stakeholders in the Upper East Region of Ghana. Analyses were carried using thematic content analysis. Although policies and actions complement each other, their integration is weak. Financial, institutional, social, and technological barriers hinder successful local implementation of some policy actions, while lack of local involvement in policy formulation also hinders adaptation practice. Integration of local perspectives into policy needs to be strengthened in order to enhance adaptation. Coupled with this is a need to consider adaptation to climate change in development policies and to pursue efforts to reduce or remove the key barriers to implementation at the local level.

  20. There is an "app" for that: Designing mobile phone technology to improve asthma action plan use in adolescent patients.

    PubMed

    Odom, Laura; Christenbery, Tom

    2016-11-01

    Asthma burden affects mortality, morbidity, quality of life, and the economy. Written asthma action plans are standard of care according to national guidelines, but these plans are often not prescribed. The purpose of this project was to develop an asthma action plan application for smartphones. A development studio was consulted for support in developing a smartphone application to code the software for the asthma action plan and assist in the design process. During development of the application, a survey was conducted to assist in design of the application and functionality. All survey participants agreed that the application was easy to use, could be used without written instruction, and was designed for adolescents with asthma of any severity. Patients and providers mostly agreed that the app would help provide information about what to do in the event of an asthma exacerbation, and the application would be used frequently. There was consensus from both patients and providers that this application is not only functional but also helpful in the event of an asthma exacerbation. The project met the goal of designing a mobile phone application that would improve patient access to asthma action plans. ©2016 American Association of Nurse Practitioners.

  1. Improving the Quality of Heisenberg Back-Action of Qubit Measurements made with Parametric Amplifiers

    NASA Astrophysics Data System (ADS)

    Sliwa, Katrina

    The quantum back-action of the measurement apparatus arising from the Heisenberg uncertainty principle is both a fascinating phenomenon and a powerful way to apply operations on quantum systems. Unfortunately, there are other effects which may overwhelm the Heisenberg back-action. This thesis focuses on two effects arising in the dispersive measurement of superconducting qubits made with two ultra-low-noise parametric amplifiers, the Josephson bifurcation amplifier (JBA) and the Josephson parametric converter (JPC). The first effect is qubit dephasing due to excess photons in the cavity coming from rogue radiation emitted by the first amplifier stage toward the system under study. This problem arises primarily in measurements made with the JBA, where a strong resonant pump tone is traditionally used to provide the energy for amplification. Replacing the single strong pump tone with two detuned pump tones minimized this dephasing to the point where the Heisenberg back-action of measurements made with the JBA could be observed. The second effect is reduced measurement efficiency arising from losses between the qubit and the parametric amplifier. Most commonly used parametric amplifiers operate in reflection, requiring additional lossy, magnetic elements known as circulators both to separate input from output, and to protect the qubits from dephasing due to the amplified reflected signal. This work presents two alternative directional elements, the Josephson circulator, which is both theoretically loss-less and does not rely upon the strong magnetic fields needed for traditional circulators, and the Josephson directional amplifier which does not send any amplified signal back toward the qubit. Both of these elements achieve directionality by interfering multiple parametric processes inside a single JPC, allowing for in-situ switching between the two modes of operation. This brings valuable experimental flexibility, and also makes these devices strong candidates for

  2. Getting Ideas into Action: Building Networked Improvement Communities in Education. Carnegie Perspectives

    ERIC Educational Resources Information Center

    Bryk, Anthony S.; Gomez, Louis M.; Grunow, Alicia

    2010-01-01

    In this Carnegie essay by Anthony Bryk, Louis Gomez and Alicia Grunow, the authors argue that the social organization of the research enterprise is badly broken and a very different alternative is needed. They instead support a science of improvement research and introduce the idea of a networked improvement community that creates the purposeful…

  3. Optical physics: Magnetic appeal in strained lattice

    NASA Astrophysics Data System (ADS)

    Lepetit, Thomas

    2013-02-01

    Using strain to induce a pseudomagnetic field in a photonic lattice at optical frequencies might bring improvements to fields such as photonic crystal fibres, supercontinuum generation and frequency combs.

  4. Improving the Translation of Intentions Into Health Actions: The Role of Motivational Coherence.

    PubMed

    Sheeran, Paschal; Conner, Mark

    2017-08-21

    This paper introduces a new construct termed motivational coherence, and tests its influence upon the process of translating intentions into health actions. Motivational coherence was defined as the extent to which predictors of intentions (e.g., attitudes, norms, perceived control) cohere or point in the same direction. The prediction tested was that motivational coherence would stabilize intentions and thereby increase intention-behavior consistency. Three studies were conducted that each involved prospective designs. Study 1 (N = 248) concerned breastfeeding among nulliparous, low-income women. Study 2 (N = 651) concerned physical activity, and Study 3 (N = 635) examined uptake of smoking among adolescents. Motivational coherence moderated intention-behavior relations in all 3 studies. Greater motivational coherence was associated with a stronger relationship between intentions and action. This finding also held when other predictors of intention (Studies 1-3) and past behavior (Studies 2-3) were taken into account. Study 3 tested and found support for the idea that temporal stability of intention mediated the moderating effect of motivational coherence. The present studies suggest that future research on predicting health behaviors should consider not only the strength of people's intentions to act but also whether the basis of respective intentions is motivationally coherent. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

  5. Improving our legacy: Incorporation of adaptive management into state wildlife action plans

    USGS Publications Warehouse

    Fontaine, J.J.

    2011-01-01

    The loss of biodiversity is a mounting concern, but despite numerous attempts there are few large scale conservation efforts that have proven successful in reversing current declines. Given the challenge of biodiversity conservation, there is a need to develop strategic conservation plans that address species declines even with the inherent uncertainty in managing multiple species in complex environments. In 2002, the State Wildlife Grant program was initiated to fulfill this need, and while not explicitly outlined by Congress follows the fundamental premise of adaptive management, 'Learning by doing'. When action is necessary, but basic biological information and an understanding of appropriate management strategies are lacking, adaptive management enables managers to be proactive in spite of uncertainty. However, regardless of the strengths of adaptive management, the development of an effective adaptive management framework is challenging. In a review of 53 State Wildlife Action Plans, I found a keen awareness by planners that adaptive management was an effective method for addressing biodiversity conservation, but the development and incorporation of explicit adaptive management approaches within each plan remained elusive. Only ???25% of the plans included a framework for how adaptive management would be implemented at the project level within their state. There was, however, considerable support across plans for further development and implementation of adaptive management. By furthering the incorporation of adaptive management principles in conservation plans and explicitly outlining the decision making process, states will be poised to meet the pending challenges to biodiversity conservation. ?? 2010 .

  6. Improving our legacy: incorporation of adaptive management into state wildlife action plans.

    PubMed

    Fontaine, Joseph J

    2011-05-01

    The loss of biodiversity is a mounting concern, but despite numerous attempts there are few large scale conservation efforts that have proven successful in reversing current declines. Given the challenge of biodiversity conservation, there is a need to develop strategic conservation plans that address species declines even with the inherent uncertainty in managing multiple species in complex environments. In 2002, the State Wildlife Grant program was initiated to fulfill this need, and while not explicitly outlined by Congress follows the fundamental premise of adaptive management, 'Learning by doing'. When action is necessary, but basic biological information and an understanding of appropriate management strategies are lacking, adaptive management enables managers to be proactive in spite of uncertainty. However, regardless of the strengths of adaptive management, the development of an effective adaptive management framework is challenging. In a review of 53 State Wildlife Action Plans, I found a keen awareness by planners that adaptive management was an effective method for addressing biodiversity conservation, but the development and incorporation of explicit adaptive management approaches within each plan remained elusive. Only ~25% of the plans included a framework for how adaptive management would be implemented at the project level within their state. There was, however, considerable support across plans for further development and implementation of adaptive management. By furthering the incorporation of adaptive management principles in conservation plans and explicitly outlining the decision making process, states will be poised to meet the pending challenges to biodiversity conservation.

  7. Hadronic Vacuum Polarization Contribution to g-2 from the Lattice

    SciTech Connect

    Dru Renner, Xu Feng, Marcus Petschlies, Karl Jansen

    2012-05-01

    We give a short description of the present situation of lattice QCD simulations. We then focus on the computation of the anomalous magnetic moment of the muon using lattice techniques. We demonstrate that by employing improved observables for the muon anomalous magnetic moment, a significant reduction of the lattice error can be obtained. This provides a promising scenario that the accuracy of lattice calculations can match the experimental errors.

  8. Connection Between the Lattice Boltzmann Equation and the Beam Scheme

    NASA Technical Reports Server (NTRS)

    Xu, Kun; Luo, Li-Shi

    1999-01-01

    In this paper we analyze and compare the lattice Boltzmann equation with the beam scheme in details. We notice the similarity and differences between the lattice Boltzmann equation and the beam scheme. We show that the accuracy of the lattice Boltzmann equation is indeed second order in space. We discuss the advantages and limitations of lattice Boltzmann equation and the beam scheme. Based on our analysis, we propose an improved multi-dimensional beam scheme.

  9. Good practice or positive action? Using Q methodology to identify competing views on improving gender equality in academic medicine.

    PubMed

    Bryant, Louise D; Burkinshaw, Paula; House, Allan O; West, Robert M; Ward, Vicky

    2017-08-22

    The number of women entering medicine has increased significantly, yet women are still under-represented at senior levels in academic medicine. To support the gender equality action plan at one School of Medicine, this study sought to (1) identify the range of viewpoints held by staff on how to address gender inequality and (2) identify attitudinal barriers to change. Q methodology. 50 potential interventions representing good practice or positive action, and addressing cultural, organisational and individual barriers to gender equality, were ranked by participants according to their perception of priority. The School of Medicine at the University of Leeds, UK. Fifty-five staff members were purposively sampled to represent gender and academic pay grade. Principal components analysis identified six competing viewpoints on how to address gender inequality. Four viewpoints favoured positive action interventions: (1) support careers of women with childcare commitments, (2) support progression of women into leadership roles rather than focus on women with children, (3) support careers of all women rather than just those aiming for leadership, and (4) drive change via high-level financial and strategic initiatives. Two viewpoints favoured good practice with no specific focus on women by (5) recognising merit irrespective of gender and (6) improving existing career development practice. No viewpoint was strongly associated with gender, pay grade or role; however, latent class analysis identified that female staff were more likely than male to prioritise the setting of equality targets. Attitudinal barriers to the setting of targets and other positive action initiatives were identified, and it was clear that not all staff supported positive action approaches. The findings and the approach have utility for those involved in gender equality work in other medical and academic institutions. However, the impact of such initiatives needs to be evaluated in the longer term.

  10. Does the American College of Surgeons National Surgical Quality Improvement Program pediatric provide actionable quality improvement data for surgical neonates?

    PubMed

    Bucher, Brian T; Duggan, Eileen M; Grubb, Peter H; France, Daniel J; Lally, Kevin P; Blakely, Martin L

    2016-09-01

    The purpose of this project was to examine the American College of Surgeons National Surgical Quality Improvement Program Pediatric (ACSNSQIP-P) Participant Use File (PUF) to compare risk-adjusted outcomes of neonates versus other pediatric surgical patients. In the ACS-NSQIP-P 2012-2013 PUF, patients were classified as preterm neonate, term neonate, or nonneonate at the time of surgery. The primary outcomes were 30-day mortality and composite morbidity. Patient characteristics significantly associated with the primary outcomes were used to build a multivariate logistic regression model. The overall 30-day mortality rate for preterm neonates, term neonate, and nonneonates was 4.9%, 2.0%, 0.1%, respectively (p<0.0001). The overall 30-day morbidity rate for preterm neonates, term neonates, and nonneonates was 27.0%, 17.4%, 6.4%, respectively (p<0.0001). After adjustment for preoperative and operative risk factors, both preterm (adjusted odds ratio, 95% CI: 2.0, 1.4-3.0) and term neonates (aOR, 95% CI: 1.9, 1.2-3.1) had a significantly increased odds of 30-day mortality compared to nonneonates. Surgical neonates are a cohort who are particularity susceptible to postoperative morbidity and mortality after adjusting for preoperative and operative risk factors. Collaborative efforts focusing on surgical neonates are needed to understand the unique characteristics of this cohort and identify the areas where the morbidity and mortality can be improved. Copyright © 2016 Elsevier Inc. All rights reserved.

  11. An action research study; cultural differences impact how manufacturing organizations receive continuous improvement

    NASA Astrophysics Data System (ADS)

    Kattman, Braden R.

    National culture and organizational culture impact how continuous improvement methods are received, implemented and deployed by suppliers. Previous research emphasized the dominance of national culture over organizational culture. The countries studied included Poland, Mexico, China, Taiwan, South Korea, Estonia, India, Canada, the United States, the United Kingdom, and Japan. The research found that Canada was most receptive to continuous improvement, with China being the least receptive. The study found that organizational culture was more influential than national culture. Isomorphism and benchmarking is driving continuous-improvement language and methods to be more universally known within business. Business and management practices are taking precedence in driving change within organizations.

  12. Improving the health of populations - evidence for policy and practice action.

    PubMed

    Ramírez, Gilbert

    2009-11-01

    The evidence-based movement has greatly improved how health scientists review literature. It has also resulted in improvements in the conduct and reporting of primary studies. Its impact in the practice of clinical medicine has been greater than in public health, both in terms of practice and policy decisions. In order to substantially improve population health, there needs to be a paradigm shift in academia - evidence should be guided by the needs of practitioners and policymakers in terms of relevance and timeliness. © 2009 Blackwell Publishing Asia Pty Ltd and Chinese Cochrane Center, West China Hospital of Sichuan University.

  13. The effectiveness of a pictorial asthma action plan for improving asthma control and the quality of life in illiterate women.

    PubMed

    Pur Ozyigit, Leyla; Ozcelik, Bahar; Ozcan Ciloglu, Seda; Erkan, Feyza

    2014-05-01

    Written asthma action plans are an important part of asthma management, but cannot be used for illiterate people. The aim of this study was to establish the effectiveness of a pictorial asthma action plan on asthma control, health-related quality of life (HRQoL), and asthma morbidity in a population of illiterate women with asthma. Forty illiterate women with moderate-severe persistent asthma were assigned alternatively to receive either asthma education alone (control group) or asthma education and a pictorial asthma action plan (study group). Asthma control was assessed using the asthma control test (ACT), HRQoL was assessed using the St George's Respiratory Questionnaire (SGRQ), and the frequency of non-scheduled hospital or emergency visits was monitored. Thirty-four patients completed the study. The ACT and SGRQ scores of both groups improved at every follow-up time point compared with baseline (p < 0.001). The ACT scores at 1 month (22.44 versus 20.75, p = 0.034) and 2 months (23.28 versus 21.81, p = 0.010) were higher in the study group than in the control group, but this was not maintained at 6 months (24.00 versus 23.25, p = 0.069). The SGRQ scores at 6 months were better in the study group (18.12) than in the control group (23.96, p = 0.033). No hospital admissions were recorded for either group. Education provides a significant improvement in asthma control and HRQoL while managing illiterate asthma patients, additionally the pictorial asthma action plan can be a helpful tool for self-medication.

  14. Factorization of fermion doubles on the lattice

    NASA Astrophysics Data System (ADS)

    de A. Bicudo, P. J.

    2000-04-01

    We address the problem of the fermion species doubling on the Lattice. Our strategy is to factorize the fermion doubles from the action. The mass term of the Dirac-Wilson action is changed. In this case the extra roots which appear in the action of free fermions in the moment representation are independent of the mass and can be factorized from the fermion propagator. However the gauge couplings suffer from the pathological ghost poles which are common to non-local actions. This action can be used to find a solution of the Ginsparg Wilson relation, which is cured from the non-local pathology. Finally we compare this factorized action with solutions of The Ginsparg Wilson relation. We find that the present is equivalent to the Zenkin action, and that it is not exponentially local, in contrast with Neuberger's action.

  15. 76 FR 40038 - Improving Government Regulations; Unified Agenda of Federal Regulatory and Deregulatory Actions

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-07

    ... Instruction 1100.22, Policy and Procedures for Determining Workforce Mix; DoD Directive 2310.01E, The... part of order issuance. This change will ultimately help improve the management and promotion of...

  16. Defense Logistics: DOD Has Taken Actions to Improve Some Segments of the Materiel Distribution System

    DTIC Science & Technology

    2012-08-03

    shipment delivery time data by reviewing related data documentation, analyzing the methodology used to determine DSO improvements, and interviewing... delivery time , also known as logistics response time, measures the time from submission of a requisition for an item to the delivery of the item to a retail...shipment delivery - time improvements within the U.S. Central Command, the U.S. European Command, and the U.S. Pacific Command areas of responsibility

  17. Training and action for patient safety: embedding interprofessional education for patient safety within an improvement methodology.

    PubMed

    Slater, Beverley L; Lawton, Rebecca; Armitage, Gerry; Bibby, John; Wright, John

    2012-01-01

    Despite an explosion of interest in improving safety and reducing error in health care, one important aspect of patient safety that has received little attention is a systematic approach to education and training for the whole health care workforce. This article describes an evaluation of an innovative multiprofessional, team-based training program that embeds patient safety within quality improvement methods. Kirkpatrick's "levels of evaluation" model was adopted to evaluate the program in health organizations across one city in the north of England. Questionnaires were used to assess reaction of participants to the program (Level 1). Improvements in patient safety knowledge and patient safety culture (Level 2) were assessed using a 12-item multiple-choice questionnaire and a culture questionnaire. Interviews and project-specific quantitative measurements were used to assess changes in professional practice and patient outcomes (Levels 3 and 4). All aspects of the program were positively received by participants. Few participants completed the MCQ at both time points, but those who did showed improvement in knowledge. There were some small but significant improvements in patient safety culture. Interviews revealed a number of additional benefits beyond the specific problems addressed. Most importantly, 8 of the 11 teams showed improvements in patient safety practices and/or outcomes. This program is an example of interprofessional education in practice and demonstrates that team-based learning using quality improvement methods is feasible and can be effective in improving patient safety, but requires time and space for participants. Alignment with continuing education arrangements could support mainstream adoption of this approach within organizations. Copyright © 2012 The Alliance for Continuing Education in the Health Professions, the Society for Academic Continuing Medical Education, and the Council on CME, Association for Hospital Medical Education.

  18. Microemulgel: an overwhelming approach to improve therapeutic action of drug moiety.

    PubMed

    Ashara, Kalpesh C; Paun, Jalpa S; Soniwala, M M; Chavda, J R; Mendapara, Vishal P; Mori, Nitin M

    2016-07-01

    As compared to gel and other topical preparations microemulgel has been prepared by screening of oils, emulsifier, and co-emulsifier on bases of solubility of an API in it. An API has high solubility and oil may also have more or less pharmacological property, so it may assist the therapeutic action of API. Due to presence of oil portion, it leads to more penetration of API in the skin. Oil Micelle Size was less than 500 nm which provides more area for absorption of API in the skin so more penetration and more effective than macro-emulsion. Microemulgel has an advantage of emulgel that has dual benefits of micro-emulsion and gel and several other desirable properties like good consistency, thyrotrophic, greaseless, easily spreadable as well as removable, emollient, non-staining, water soluble, longer shelf-life, bio-friendly, transparent, pleasant appearance, ability of patients for self-medication, termination of medications will be easy, etc.

  19. Featuring dental education research: applying the principles of action research to improve teaching of dental prosthetics.

    PubMed

    Khan, S B

    2009-11-01

    This article focuses on educational research conducted at the newly merged UWC faculty of dentistry. The research emphasises the change in teaching methods employed to address the concerns experienced in teaching the new large classes as observed in the prosthetic techniques module. These educational interventions were conducted over 5 years and the study design included the principles of action research. Students were assisted in learning the theory of the practical procedures and the subsequent completion of these procedures with the accurate application of the theoretical concepts. Changes in the teaching methods enhanced students learning and successful translation of the theory into practical work. The active learning exercises incorporated into the teaching further motivated and assisted students with deep learning. The debates indicated that students know and accept the value of the module as part of their training.

  20. The Italian screening program for primary congenital hypothyroidism: actions to improve screening, diagnosis, follow-up, and surveillance.

    PubMed

    Cassio, A; Corbetta, C; Antonozzi, I; Calaciura, F; Caruso, U; Cesaretti, G; Gastaldi, R; Medda, E; Mosca, F; Pasquini, E; Salerno, M C; Stoppioni, V; Tonacchera, M; Weber, G; Olivieri, A

    2013-03-01

    The Italian screening program for primary congenital hypothyroidism (CH) is an integrated system including neonatal screening, diagnosis, treatment, follow-up, and nationwide surveillance of the disease. The aim of the Italian screening program for CH is to identify not only babies with severe permanent CH (core target), but also babies with mild persistent and transient forms of CH who could have a benefit from an early replacement therapy (secondary target). In the last years, despite the important results obtained in terms of standardization of screening and follow-up procedures, it has become clear the need of optimizing the program in order to harmonize the screening strategy and the screening procedures among Regions, and to improve the diagnostic and therapeutic approach in all affected infants. On the basis of available guidelines, the experience of the Italian screening and clinical reference centers, and the knowledge derived from the nation-wide surveillance activity performed by the Italian National Registry of Infants with CH, the Italian Society for Pediatric Endocrinology and Diabetology together with the Italian Society for the Study of Metabolic Diseases and Neonatal Screening and the Italian National Institute of Health promoted actions aimed at improving diagnosis, treatment, follow-up and surveillance of CH in our country. In this paper the most important actions to improve the Italian screening program for CH are described. ©2013, Editrice Kurtis

  1. An introduction to chiral symmetry on the lattice

    NASA Astrophysics Data System (ADS)

    Chandrasekharan, S.; Wiese, U.-J.

    2004-10-01

    The SU( Nf) L⊗ SU( Nf) R chiral symmetry of QCD is of central importance for the nonperturbative low-energy dynamics of light quarks and gluons. Lattice field theory provides a theoretical framework in which these dynamics can be studied from first principles. The implementation of chiral symmetry on the lattice is a nontrivial issue. In particular, local lattice fermion actions with the chiral symmetry of the continuum theory suffer from the fermion doubling problem. The Ginsparg-Wilson relation implies Lüscher’s lattice variant of chiral symmetry which agrees with the usual one in the continuum limit. Local lattice fermion actions that obey the Ginsparg-Wilson relation have an exact chiral symmetry, the correct axial anomaly, they obey a lattice version of the Atiyah-Singer index theorem, and still they do not suffer from the notorious doubling problem. The Ginsparg-Wilson relation is satisfied exactly by Neuberger’s overlap fermions which are a limit of Kaplan’s domain wall fermions, as well as by Hasenfratz and Niedermayer’s classically perfect lattice fermion actions. When chiral symmetry is nonlinearly realized in effective field theories on the lattice, the doubling problem again does not arise. This review provides an introduction to chiral symmetry on the lattice with an emphasis on the basic theoretical framework.

  2. Neutron electric dipole moment from lattice QCD

    SciTech Connect

    Shintani, E.; Kanaya, K.; Aoki, S.; Ishizuka, N.; Kuramashi, Y.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.; Kikukawa, Y.; Okawa, M.

    2005-07-01

    We carry out a feasibility study for the lattice QCD calculation of the neutron electric dipole moment (NEDM) in the presence of the {theta} term. We develop the strategy to obtain the nucleon EDM from the CP-odd electromagnetic form factor F{sub 3} at small {theta}, in which NEDM is given by lim{sub q{sup 2}}{sub {yields}}{sub 0}{theta}F{sub 3}(q{sup 2})/(2m{sub N}), where q is the momentum transfer and m{sub N} is the nucleon mass. We first derive a formula which relates F{sub 3}, a matrix element of the electromagnetic current between nucleon states, with vacuum expectation values of nucleons and/or the current. In the expansion of {theta}, the parity-odd part of the nucleon-current-nucleon three-point function contains contributions not only from the parity-odd form factors but also from the parity-even form factors multiplied by the parity-odd part of the nucleon two-point function, and, therefore, the latter contribution must be subtracted to extract F{sub 3}. We then perform an explicit lattice calculation employing the domain-wall quark action with the renormalization group improved gauge action in quenched QCD at a{sup -1}{approx_equal}2 GeV on a 16{sup 3}x32x16 lattice. At the quark mass m{sub f}a=0.03, corresponding to m{sub {pi}}/m{sub {rho}}{approx_equal}0.63, we accumulate 730 configurations, which allow us to extract the parity-odd part in both two- and three-point functions. Employing two different Dirac {gamma} matrix projections, we show that a consistent value for F{sub 3} cannot be obtained without the subtraction described above. We obtain F{sub 3}(q{sup 2}{approx_equal}0.58 GeV{sup 2})/(2m{sub N})=-0.024(5)e{center_dot}fm for the neutron and F{sub 3}(q{sup 2}{approx_equal}0.58 GeV{sup 2})/(2m{sub N})=0.021(6)e{center_dot}fm for the proton.

  3. Improving a scissor-action couch for conformal arc radiotherapy and radiosurgery.

    PubMed

    Li, Kaile; Yu, Cedric X; Ma, Lijun

    2004-01-01

    We have developed a method to improve the setup accuracy of a Varian Clinac 6/100 couch for delivering conformal arc therapy using a tertiary micro multileaf collimator (MLC) system. Several immobilization devices have been developed to improve the mechanical stability and isocenter alignment of the couch: turn-knob harnesses, double-track alignment plates, and a drop-in rod that attaches the couch to the concrete floor. These add-on components minimize the intercomponent motion of the couch's scissor elevator, which allows consistent treatment setup. The accuracy of our isocenter couch alignment is an improvement over the above devices, within 1 mm of their accuracy. The couch has been used with over 15 patients and with over 50 modulated conformal arc treatment deliveries at our institution.

  4. Potentially preventable events: an actionable set of measures for linking quality improvement and cost savings.

    PubMed

    Goldfield, Norbert; Kelly, William P; Patel, Kavita

    2012-01-01

    Rising health care costs will result in reduced payments to providers, but across-the-board provider payment reductions are not the answer. Instead, existing payment systems should be reformed to strengthen value for the dollars spent. This can be accomplished by increasing efficiency, improving quality and outcomes, and lowering costs. Payment system reforms must be practical, transparent, identify opportunities for care improvement, and demonstrate material cost savings. Most importantly, because the current growth in health care costs is unsustainable, these reforms must be able to be implemented today. A set of comprehensive measures is being used by state government and private payers in the United States to adjust payment, based on improved outcomes quality. This article details the use of this set of measures, referred to as potentially preventable events, and demonstrates how they are being applied to achieve health care value.

  5. Lattice invariants for knots

    SciTech Connect

    Janse Van Rensburg, E.J.

    1996-12-31

    The geometry of polygonal knots in the cubic lattice may be used to define some knot invariants. One such invariant is the minimal edge number, which is the minimum number of edges necessary (and sufficient) to construct a lattice knot of given type. In addition, one may also define the minimal (unfolded) surface number, and the minimal (unfolded) boundary number; these are the minimum number of 2-cells necessary to construct an unfolded lattice Seifert surface of a given knot type in the lattice, and the minimum number of edges necessary in a lattice knot to guarantee the existence of an unfolded lattice Seifert surface. In addition, I derive some relations amongst these invariants. 8 refs., 5 figs., 2 tabs.

  6. Training and Action for Patient Safety: Embedding Interprofessional Education for Patient Safety within an Improvement Methodology

    ERIC Educational Resources Information Center

    Slater, Beverley L.; Lawton, Rebecca; Armitage, Gerry; Bibby, John; Wright, John

    2012-01-01

    Introduction: Despite an explosion of interest in improving safety and reducing error in health care, one important aspect of patient safety that has received little attention is a systematic approach to education and training for the whole health care workforce. This article describes an evaluation of an innovative multiprofessional, team-based…

  7. The Pratt Center for Community Improvement: A University Urban Action Program.

    ERIC Educational Resources Information Center

    Raymond, George M.; Shiffman, Ronald

    The Pratt Center for Community Improvement was founded in Brooklyn in 1963 by Pratt Institute. Its aim was to help equalize the knowledge level of city and community representatives concerning issues in urban renewal, and to gain the confidence of local residents and enhance their participation in decision making. Participant education and…

  8. Action Research to Improve Methods of Delivery and Feedback in an Access Grid Room Environment

    ERIC Educational Resources Information Center

    McArthur, Lynne C.; Klass, Lara; Eberhard, Andrew; Stacey, Andrew

    2011-01-01

    This article describes a qualitative study which was undertaken to improve the delivery methods and feedback opportunity in honours mathematics lectures which are delivered through Access Grid Rooms. Access Grid Rooms are facilities that provide two-way video and audio interactivity across multiple sites, with the inclusion of smart boards. The…

  9. From Planning to Action: Government Initiatives for Improving School-Level Practice.

    ERIC Educational Resources Information Center

    Chapman, David W., Ed.; Mahlck, Lars O., Ed.; Smulders, Anna E. M., Ed.

    This work examines ways central and regional education ministries can influence practices at the school level. Chapter 1, "Changing What Happens in Schools: Central-Level Initiatives to Improve School Practice," reviews common themes, concerns, problems, and emphases. Chapter 2, "Knowledge Utilization and the Process of Policy…

  10. Action Research to Improve Methods of Delivery and Feedback in an Access Grid Room Environment

    ERIC Educational Resources Information Center

    McArthur, Lynne C.; Klass, Lara; Eberhard, Andrew; Stacey, Andrew

    2011-01-01

    This article describes a qualitative study which was undertaken to improve the delivery methods and feedback opportunity in honours mathematics lectures which are delivered through Access Grid Rooms. Access Grid Rooms are facilities that provide two-way video and audio interactivity across multiple sites, with the inclusion of smart boards. The…

  11. Education's Library. Actions Needed To Improve Its Usefulness. Report to Congressional Committees.

    ERIC Educational Resources Information Center

    General Accounting Office, Washington, DC. Div. of Human Resources.

    The Library Services and Construction Act (LSCA) Amendments of 1990 required the General Accounting Office (GAO) to conduct a review of the Department of Education's Research Library, which is a component of the Office of Educational Research and Improvement (OERI). Data were gathered by interviewing one researcher and four librarians familiar…

  12. Evaluating the Implementation of a Training Program for Improving Quality Service: An Action Research Study

    ERIC Educational Resources Information Center

    Pierre, Ketly Dieudonne

    2014-01-01

    There is a need to implement a comprehensive training program to build employees' knowledge, skills, and attitudes in order to improve quality service at ABC Restaurant because of a surge in customer complaints. The purpose of this study was to develop a training program that included an employee handbook as a training tool, a handbook designed…

  13. An Action Research Intervention for Improving Soldiers' Success in Their Off-Duty Education Pursuits

    ERIC Educational Resources Information Center

    Ferby, Clifford Jerome

    2013-01-01

    Many soldiers are interested in pursuing their college education but discover there are barriers and roadblocks that hamper their ability to take college courses. The notion of taking the classroom to the soldiers within their military unit should be studied further. The reason for this research was to improve soldiers' success in pursuing their…

  14. Improving College Choice: Helping Students and Parents Make Better Informed Decisions. Data for Action 2012

    ERIC Educational Resources Information Center

    Data Quality Campaign, 2012

    2012-01-01

    As the demand for college graduates increases, it is critical (from both supply and demand perspectives) that students choose the postsecondary option that best meets their needs. Improved college readiness is an important first step to better informed choices about college. Parents and students need access to easy-to-understand data to make the…

  15. Improving Instructional Practices at the Secondary Level through Actions of a Learning Organization

    ERIC Educational Resources Information Center

    Loudermilk, Teresa J.

    2013-01-01

    Schools' functioning as learning organizations provide educators the opportunity to focus on working together in innovative ways. However, it is unknown to what extent learning organizations exist in small high schools or whether small high schools' functioning as learning organizations improve academic achievement. The purpose of this study was…

  16. Evaluating the Implementation of a Training Program for Improving Quality Service: An Action Research Study

    ERIC Educational Resources Information Center

    Pierre, Ketly Dieudonne

    2014-01-01

    There is a need to implement a comprehensive training program to build employees' knowledge, skills, and attitudes in order to improve quality service at ABC Restaurant because of a surge in customer complaints. The purpose of this study was to develop a training program that included an employee handbook as a training tool, a handbook designed…

  17. Training and Action for Patient Safety: Embedding Interprofessional Education for Patient Safety within an Improvement Methodology

    ERIC Educational Resources Information Center

    Slater, Beverley L.; Lawton, Rebecca; Armitage, Gerry; Bibby, John; Wright, John

    2012-01-01

    Introduction: Despite an explosion of interest in improving safety and reducing error in health care, one important aspect of patient safety that has received little attention is a systematic approach to education and training for the whole health care workforce. This article describes an evaluation of an innovative multiprofessional, team-based…

  18. The EMMA Lattice

    NASA Astrophysics Data System (ADS)

    Berg, J. Scott

    2008-02-01

    EMMA is a 10 to 20 MeV electron ring designed to test our understanding of beam dynamics in a relativistic linear non-scaling fixed field alternating gradient accelerator (FFAG). I will give a basic review of the EMMA lattice parameters. Then I will review the different lattice configurations that we would like to have for EMMA. Finally, I will briefly discuss the process of commissioning each lattice configuration.

  19. Using action research to investigate and improve hospice staff participation in workplace education.

    PubMed

    Griffith, Sue

    2013-06-01

    Finding ways to make good quality education available to all staff in an expanding and increasingly busy hospice organisation is a real challenge. Constantly providing learning opportunities that are then poorly attended owing to the pressure of work is equally disappointing, and leads to questions of cost-effectiveness. An action research project was undertaken to investigate the reasons for low attendance rates at learning events in one hospice. Having identified time and conflict with patient need as major issues, a second cycle of research using literature review and a survey methodology was conducted to find a contemporary and innovative solution to this problem in an attempt to establish a vibrant learning culture. As a result a virtual learning environment--ORACLE (Online Research and Care Learning Environment)--was created to augment the face-to-face sessions and provide staff with access to appropriate learning materials 24 hours per day, 365 days per year.Although unique to this organisation, ORACLE has potential application to any other work environment.

  20. Challenges Facing Early Phase Trials Sponsored by the National Cancer Institute: An Analysis of Corrective Action Plans to Improve Accrual.

    PubMed

    Massett, Holly A; Mishkin, Grace; Rubinstein, Larry; Ivy, S Percy; Denicoff, Andrea; Godwin, Elizabeth; DiPiazza, Kate; Bolognese, Jennifer; Zwiebel, James A; Abrams, Jeffrey S

    2016-11-15

    Accruing patients in a timely manner represents a significant challenge to early phase cancer clinical trials. The NCI Cancer Therapy Evaluation Program analyzed 19 months of corrective action plans (CAP) received for slow-accruing phase I and II trials to identify slow accrual reasons, evaluate whether proposed corrective actions matched these reasons, and assess the CAP impact on trial accrual, duration, and likelihood of meeting primary scientific objectives. Of the 135 CAPs analyzed, 69 were for phase I trials and 66 for phase II trials. Primary reasons cited for slow accrual were safety/toxicity (phase I: 48%), design/protocol concerns (phase I: 42%, phase II: 33%), and eligibility criteria (phase I: 41%, phase II: 35%). The most commonly proposed corrective actions were adding institutions (phase I: 43%, phase II: 85%) and amending the trial to change eligibility or design (phase I: 55%, phase II: 44%). Only 40% of CAPs provided proposed corrective actions that matched the reasons given for slow accrual. Seventy percent of trials were closed to accrual at time of analysis (phase I = 48; phase II = 46). Of these, 67% of phase I and 70% of phase II trials met their primary objectives, but they were active three times longer than projected. Among closed trials, 24% had an accrual rate increase associated with a greater likelihood of meeting their primary scientific objectives. Ultimately, trials receiving CAPs saw improved accrual rates. Future trials may benefit from implementing CAPs early in trial life cycles, but it may be more beneficial to invest in earlier accrual planning. Clin Cancer Res; 22(22); 5408-16. ©2016 AACRSee related commentary by Mileham and Kim, p. 5397.

  1. Improvement via hypercubic smearing in triplet and sextet QCD

    SciTech Connect

    Shamir, Yigal; Svetitsky, Benjamin; Yurkovsky, Evgeny

    2011-05-01

    We study nonperturbative improvement in SU(3) lattice gauge theory coupled to fermions in the fundamental and two-index symmetric representations. Our lattice action is defined with hypercubic smeared links incorporated into the Wilson-clover fermion kernel. Using standard Schroedinger-functional techniques, we estimate the clover coefficient c{sub SW} and find that discretization errors are much smaller than in thin-link theories.

  2. Homeland Defense: Continued Actions Needed to Improve Management of Air Sovereignty Alert Operations

    DTIC Science & Technology

    2012-01-01

    Better Outcomes, GAO-10-374T (Washington, D.C.: May 20, 2009); Aviation Security : DHS and TSA Have Researched, Developed and Begun Deploying Passenger... Security : TSA Has Made Progress, but Additional Efforts Are Needed to Improve Security. GAO-11-938T. Washington, D.C.: September 16, 2011. Aviation ...Washington, D.C.: October 23, 2009. Related GAO Products Homeland Defense DOD Tactical Aircraft Aviation Security Risk Management Related GAO

  3. Defense Acquisitions: Joint Action Needed by DOD and Congress to Improve Outcomes

    DTIC Science & Technology

    2015-10-27

    DISTRIBUTION/AVAILABILITY STATEMENT Approved for public release; distribution unlimited 13. SUPPLEMENTARY NOTES 14. ABSTRACT 15 . SUBJECT TERMS 16...country can afford. Quality and timeliness are especially critical to maintain DOD’s superiority over 1GAO, High-Risk Series: An Update, GAO- 15 -290...improvements, but it is too early to assess their long term impact.4 3GAO, Defense Acquisitions: Assessments of Selected Weapon Programs, GAO- 15 -342SP

  4. Identifying priority actions for improving patient satisfaction with outpatient cancer care.

    PubMed

    Gesell, Sabina B; Gregory, Nancy

    2004-01-01

    In parallel to developing new cancer therapies, the healthcare community has the responsibility of creating positive treatment experiences for patients. Data from 5907 cancer outpatients treated at 23 hospitals across the United States were analyzed to identify the top priorities for service improvement in outpatient cancer treatment facilities. They included meeting patients' emotional needs, providing information to patients and family members, reducing waiting times, and providing convenience and coordinated care among physicians and other care providers.

  5. Improvement of pressure ulcer prevention care in private for-profit residential care homes: an action research study.

    PubMed

    Kwong, Enid Wy; Hung, Maria Sy; Woo, Kevin

    2016-11-25

    A need exits to develop a protocol for preventing pressure ulcers (PUs) in private for-profit nursing homes in Hong Kong, where the incidence of PUs is relatively high and which have high proportion of non-professional care staff. The implementation of such protocol would involve changes in the practice of care, likely evoking feelings of fear and uncertainty that may become a barrier to staff adherence. We thus adopted the Systems Model of Action Research in this study to manage the process of change for improving PU prevention care and to develop a pressure ulcer prevention protocol for private for-profit nursing homes. A total of 474 residents and care staff who were health workers, personal care workers, and/or nurses from four private, for-profit nursing homes in Hong Kong participated in this study. Three cyclic stages and steps, namely, unfreezing (planning), changing (action), and refreezing (results) were carried out. During each cycle, focus group interviews, field observations of the care staff's practices and inspections of the skin of the residents for pressure ulcers were conducted to evaluate the implementation of the protocol. Qualitative content analysis was adopted to analyse the data. The data and methodological triangulation used in this study increased the credibility and validity of the results. The following nine themes emerged from this study: prevention practices after the occurrence of PUs, the improper use of pressure ulcer prevention materials, non-compliance with several prevention practices, improper prevention practices, the perception that the preventive care was being performed correctly, inadequate readiness to use the risk assessment tool, an undesirable environment, the supplying of unfavorable resources, and various management styles in the homes with or without nurses. At the end of the third cycle, the changes that were identified included improved compliance with the revised risk assessment method, the timely and appropriate

  6. Kinematic and kinetic improvements associated with action observation facilitated learning of the power clean in Australian footballers.

    PubMed

    Sakadjian, Alex; Panchuk, Derek; Pearce, Alan J

    2014-06-01

    This study investigated the effectiveness of action observation (AO) on facilitating learning of the power clean technique (kinematics) compared with traditional strength coaching methods and whether improvements in performance (kinetics) were associated with an improvement in lifting technique. Fifteen subjects (age, 20.9 ± 2.3 years) with no experience in performing the power clean exercise attended 12 training and testing sessions over a 4-week period. Subjects were assigned to 2 matched groups, based on preintervention power clean performance and performed 3 sets of 5 repetitions of the power clean exercise at each training session. Subjects in the traditional coaching group (TC; n = 7) received the standard coaching feedback (verbal cues and physical practice), whereas subjects in the AO group (n = 8) received similar verbal coaching cues and physical practice but also observed a video of a skilled model before performing each set. Kinematic data were collected from video recordings of subjects who were fitted with joint center markings during testing, whereas kinetic data were collected from a weightlifting analyzer attached to the barbell. Subjects were tested before intervention, at the end of weeks 2 and 3, and at after intervention at the end of week 4. Faster improvements (3%) were observed in power clean technique with AO-facilitated learning in the first week and performance improvements (mean peak power of the subject's 15 repetitions) over time were significant (p < 0.001). In addition, performance improvement was significantly associated (R = 0.215) with technique improvements. In conclusion, AO combined with verbal coaching and physical practice of the power clean exercise resulted in significantly faster technique improvements and improvement in performance compared with traditional coaching methods.

  7. Low-frequency transcranial magnetic stimulation over left dorsal premotor cortex improves the dynamic control of visuospatially cued actions

    PubMed Central

    Ward, Nick S.; Bestmann, Sven; Hartwigsen, Gesa; Weiss, Michael M.; Christensen, Lars O.D.; Frackowiak, Richard S.J.; Rothwell, John C.; Siebner, Hartwig R.

    2013-01-01

    Left rostral dorsal premotor cortex (rPMd) and supramarginal gyrus (SMG) have been implicated in the dynamic control of actions. In 12 right-handed healthy individuals we applied 30 minutes of low-frequency (1Hz) repetitive transcranial magnetic stimulation (rTMS) over left rPMd to investigate the involvement of left rPMd and SMG in the rapid adjustment of actions guided by visuospatial cues. After rTMS, subjects underwent functional magnetic resonance imaging while making spatially congruent button presses with right or left index finger in response to a left- or right-sided target. Subjects were asked to covertly prepare motor responses as indicated by a directional cue presented one second before the target. On 20% of trials the cue was invalid requiring subjects to re-adjust their motor plan according to the target location. Compared to sham rTMS, real rTMS increased the number of correct responses in invalidly cued trials. After real rTMS, task-related activity of the stimulated left rPMd showed increased task-related coupling with activity in ipsilateral SMG and adjacent anterior intraparietal area (AIP). Individuals who showed a stronger increase in left-hemispheric premotor-parietal connectivity also made fewer errors on invalidly cued trials after rTMS. The results suggest that rTMS over left rPMd improved the ability to dynamically adjust visuospatial response mapping by strengthening left-hemispheric connectivity between rPMd and the SMG-AIP region. These results support the notion that left rPMd and SMG-AIP contribute towards dynamic control of actions, and demonstrate that low-frequency rTMS can enhance functional coupling between task-relevant brain regions and improve some aspects of motor performance. PMID:20610756

  8. Erbium doped tellurite glasses with improved thermal properties as promising candidates for laser action and amplification

    NASA Astrophysics Data System (ADS)

    Benmadani, Y.; Kermaoui, A.; Chalal, M.; Khemici, W.; Kellou, A.; Pellé, F.

    2013-10-01

    The influence of composition on the thermal stability of tellurite glasses was investigated by using differential scanning calorimetry (DSC). The studied glasses were synthesized by conventional melting quenching method. The best thermal stability and poor crystallization tendency were obtained for the glass composed of 65TeO2-15ZnO-10Na2O-5BaO-3La2O3 doped with Er2O3 (2 mol %). This glass will be referred, in this article, as TZNBL: Er3+ glass. The spectroscopic properties of the above glass are investigated based on the Judd-Ofelt and McCumber theories. The calculated intensity parameters (Ω2,4,6) are compared to those obtained for Er3+ in other glasses. The radiative emission rate has been calculated for the different Er3+emitting levels. The high values of Ω4 and Ω6 confirm the results of the DSC experiment concerning the rigidity of the studied glass. Absorption, emission and gain cross section of the 4I13/2 ↔ 4I15/2 (Er3+) transition in the studied glass are reported and the results are compared to those of other glasses. The 4I13/2 ↔ 4I15/2 (Er3+) absorption and emission cross sections derived by the application of the Mc Cumber's theory corroborate the Judd-Ofelt results. The whole of results demonstrate that the new composition leads to good thermal and mechanical properties as well efficient Er3+ absorption, emission cross sections, which make this glass as a promising candidate for laser action and amplification.

  9. Predicting improved optical water quality in rivers resulting from soil conservation actions on land.

    PubMed

    Dymond, J R; Davies-Colley, R J; Hughes, A O; Matthaei, C D

    2017-12-15

    Deforestation in New Zealand has led to increased soil erosion and sediment loads in rivers. Increased suspended fine sediment in water reduces visual clarity for humans and aquatic animals and reduces penetration of photosynthetically available radiation to aquatic plants. To mitigate fine-sediment impacts in rivers, catchment-wide approaches to reducing soil erosion are required. Targeting soil conservation for reducing sediment loads in rivers is possible through existing models; however, relationships between sediment loads and sediment-related attributes of water that affect both ecology and human uses of water are poorly understood. We present methods for relating sediment loads to sediment concentration, visual clarity, and euphotic depth. The methods require upwards of twenty concurrent samples of sediment concentration, visual clarity, and euphotic depth at a river site where discharge is measured continuously. The sediment-related attributes are related to sediment concentration through regressions. When sediment loads are reduced by soil conservation action, percentiles of sediment concentration are necessarily reduced, and the corresponding percentiles of visual clarity and euphotic depth are increased. The approach is demonstrated on the Wairua River in the Northland region of New Zealand. For this river we show that visual clarity would increase relatively by approximately 1.4 times the relative reduction of sediment load. Median visual clarity would increase from 0.75m to 1.25m (making the river more often suitable for swimming) after a sediment load reduction of 50% associated with widespread soil conservation on pastoral land. Likewise euphotic depth would increase relatively by approximately 0.7 times the relative reduction of sediment load, and the median euphotic depth would increase from 1.5m to 2.0m with a 50% sediment load reduction. Copyright © 2017 Elsevier B.V. All rights reserved.

  10. cGMP phosphodiesterase inhibition improves the vascular and metabolic actions of insulin in skeletal muscle.

    PubMed

    Genders, A J; Bradley, E A; Rattigan, S; Richards, S M

    2011-08-01

    There is considerable support for the concept that insulin-mediated increases in microvascular blood flow to muscle impact significantly on muscle glucose uptake. Since the microvascular blood flow increases with insulin have been shown to be nitric oxide-dependent inhibition of cGMP-degrading phosphodiesterases (cGMP PDEs) is predicted to enhance insulin-mediated increases in microvascular perfusion and muscle glucose uptake. Therefore, we studied the effects of the pan-cGMP PDE inhibitor zaprinast on the metabolic and vascular actions of insulin in muscle. Hyperinsulinemic euglycemic clamps (3 mU·min(-1)·kg(-1)) were performed in anesthetized rats and changes in microvascular blood flow assessed from rates of 1-methylxanthine metabolism across the muscle bed by capillary xanthine oxidase in response to insulin and zaprinast. We also characterized cGMP PDE isoform expression in muscle by real-time PCR and immunostaining of frozen muscle sections. Zaprinast enhanced insulin-mediated microvascular perfusion by 29% and muscle glucose uptake by 89%, while whole body glucose infusion rate during insulin infusion was increased by 33% at 2 h. PDE2, -9, and -10 were the major isoforms expressed at the mRNA level in muscle, while PDE1B, -9A, -10A, and -11A proteins were expressed in blood vessels. Acute administration of the cGMP PDE inhibitor zaprinast enhances muscle microvascular blood flow and glucose uptake response to insulin. The expression of a number of cGMP PDE isoforms in skeletal muscle suggests that targeting specific cGMP PDE isoforms may provide a promising avenue for development of a novel class of therapeutics for enhancing muscle insulin sensitivity.

  11. Improving the antidepressant action and the bioavailability of sertraline by co-crystallization with coumarin 3-carboxylate. Structural determination.

    PubMed

    Escudero, Graciela E; Laino, Carlos H; Echeverría, Gustavo A; Piro, Oscar E; Martini, Nancy; Rodríguez, Ailén N; Martínez Medina, Juan J; López Tévez, Libertad L; Ferrer, Evelina G; Williams, Patricia A M

    2016-04-05

    To improve the antidepressant action of sertraline a new salt with coumarin-3-carboxylate anion (SerH-CCA) has been synthesized by two different methods and characterized by FTIR spectroscopy and structural determinations by X-ray diffraction methods. The new salt is stabilized by strong intermolecular H-bonds involving the protonated amine group of SerH and the deprotonated carboxylate group of CCA. These findings can be correlated with the interpretation of the infrared spectrum. The salt, sertraline (SerHCl) and the sodium salt of coumarin-3-carboxylate (NaCCA) were orally administered male Wistar rats (10 mg/kg, based on sertraline). Rats were evaluated in separate groups by means of the forced swimming (FST). SerH-CCA produced antidepressant effects in a magnitude that exceeded SerHCl individual effects. None of these treatments affected activity levels by the open field OFT tests. We have also determined that the ion pair also improve the binding to bovine serum albumin (BSA) of the drug but retain its antimicrobial activity. It is reasonable to conclude that the replacement of chloride anion by a large organic anion in sertraline strengthens the pharmacological action of the native drug, binding to BSA with higher activity and retaining the antimicrobial activity of the antidepressant compound.

  12. B(0)-B(0) mixing in unquenched lattice QCD.

    PubMed

    Aoki, S; Fukugita, M; Hashimoto, S; Ishikawa, K-I; Ishizuka, N; Iwasaki, Y; Kanaya, K; Kaneko, T; Kuramashi, Y; Okawa, M; Onogi, T; Tsutsui, N; Ukawa, A; Yamada, N; Yoshié, T

    2003-11-21

    We present an unquenched lattice calculation for the B(0)-B(0) transition amplitude. The calculation, carried out at an inverse lattice spacing 1/a=2.22(4) GeV, incorporates two flavors of dynamical quarks described by the O(a)-improved Wilson fermion action and heavy quarks described by nonrelativistic QCD. Particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay constant, whereas it is small for the B parameters. We obtain f(B(d))=191(10)(+12-22) MeV, f(B(s))/f(B(d))=1.13(3)(+13-2), B(B(d))(m(b))=0.836(27)(+56-62), B(B(s))/B(B(d))=1.017(16)(+56-17), and xi=1.14(3)(+13-2), where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion, and perturbative operator matching.

  13. 2+1 flavor lattice QCD toward the physical point

    SciTech Connect

    Aoki, S.; Ishikawa, K.-I.; Okawa, M.; Ishizuka, N.; Kuramashi, Y.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.; Izubuchi, T.; Kadoh, D.; Namekawa, Y.; Ukita, N.; Kanaya, K.

    2009-02-01

    We present the first results of the PACS-CS project which aims to simulate 2+1 flavor lattice QCD on the physical point with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action. Numerical simulations are carried out at {beta}=1.9, corresponding to the lattice spacing of a=0.0907(13) fm, on a 32{sup 3}x64 lattice with the use of the domain-decomposed HMC algorithm to reduce the up-down quark mass. Further algorithmic improvements make possible the simulation whose up-down quark mass is as light as the physical value. The resulting pseudoscalar meson masses range from 702 MeV down to 156 MeV, which clearly exhibit the presence of chiral logarithms. An analysis of the pseudoscalar meson sector with SU(3) chiral perturbation theory reveals that the next-to-leading order corrections are large at the physical strange quark mass. In order to estimate the physical up-down quark mass, we employ the SU(2) chiral analysis expanding the strange quark contributions analytically around the physical strange quark mass. The SU(2) low energy constants l{sub 3} and l{sub 4} are comparable with the recent estimates by other lattice QCD calculations. We determine the physical point together with the lattice spacing employing m{sub {pi}}, m{sub K} and m{sub {omega}} as input. The hadron spectrum extrapolated to the physical point shows an agreement with the experimental values at a few % level of statistical errors, albeit there remain possible cutoff effects. We also find that our results of f{sub {pi}}, f{sub K} and their ratio, where renormalization is carries out perturbatively at one loop, are compatible with the experimental values. For the physical quark masses we obtain m{sub ud}{sup MS} and m{sub s}{sup MS} extracted from the axial-vector Ward-Takahashi identity with the perturbative renormalization factors. We also briefly discuss the results for the static quark potential.

  14. Masses and decay constants of pions and kaons in mixed-action staggered chiral perturbation theory

    NASA Astrophysics Data System (ADS)

    Bailey, Jon A.; Kim, Jongjeong; Lee, Weonjong; Kim, Hyung-Jin; Yoon, Boram

    2017-08-01

    Lattice QCD calculations with different staggered valence and sea quarks can be used to improve determinations of quark masses, Gasser-Leutwyler couplings, and other parameters relevant to phenomenology. We calculate the masses and decay constants of flavored pions and kaons through next-to-leading order in staggered-valence, staggered-sea mixed-action chiral perturbation theory. We present the results in the valence-valence and valence-sea sectors, for all tastes. As in unmixed theories, the taste-pseudoscalar, valence-valence mesons are exact Goldstone bosons in the chiral limit, at nonzero lattice spacing. The results reduce correctly when the valence and sea quark actions are identical, connect smoothly to the continuum limit, and provide a way to control light quark and gluon discretization errors in lattice calculations performed with different staggered actions for the valence and sea quarks.

  15. Impaired Muscle AMPK Activation in the Metabolic Syndrome May Attenuate Improved Insulin Action after Exercise Training

    PubMed Central

    Layne, Andrew S.; Nasrallah, Sami; South, Mark A.; Howell, Mary E. A.; McCurry, Melanie P.; Ramsey, Michael W.; Stone, Michael H.

    2011-01-01

    Context: Strength training induces muscle remodeling and may improve insulin responsiveness. Objective: This study will quantify the impact of resistance training on insulin sensitivity in subjects with the metabolic syndrome and correlate this with activation of intramuscular pathways mediating mitochondrial biogenesis and muscle fiber hypertrophy. Design: Ten subjects with the metabolic syndrome (MS) and nine sedentary controls underwent 8 wk of supervised resistance exercise training with pre- and posttraining anthropometric and muscle biochemical assessments. Setting: Resistance exercise training took place in a sports laboratory on a college campus. Main Outcome Measures: Pre- and posttraining insulin responsiveness was quantified using a euglycemic clamp. Changes in expression of muscle 5-AMP-activated protein kinase (AMPK) and mammalian target of rapamycin (mTOR) pathways were quantified using immunoblots. Results: Strength and stamina increased in both groups. Insulin sensitivity increased in controls (steady-state glucose infusion rate = 7.0 ± 2.0 mg/kg · min pretraining training vs. 8.7 ± 3.1 mg/kg · min posttraining; P < 0.01) but did not improve in MS subjects (3.3 ± 1.3 pre vs. 3.1 ± 1.0 post). Muscle glucose transporter 4 increased 67% in controls and 36% in the MS subjects. Control subjects increased muscle phospho-AMPK (43%), peroxisome proliferator-activated receptor γ coactivator 1α (57%), and ATP synthase (60%), more than MS subjects (8, 28, and 21%, respectively). In contrast, muscle phospho-mTOR increased most in the MS group (57 vs. 32%). Conclusion: Failure of resistance training to improve insulin responsiveness in MS subjects was coincident with diminished phosphorylation of muscle AMPK, but increased phosphorylation of mTOR, suggesting activation of the mTOR pathway could be involved in inhibition of exercise training-related increases in AMPK and its activation and downstream events. PMID:21508135

  16. Neutral B meson mixing in unquenched lattice QCD

    SciTech Connect

    Gamiz, Elvira; Davies, Christine T. H.; Lepage, G. Peter; Shigemitsu, Junko; Wingate, Matthew

    2009-07-01

    We study B{sub d} and B{sub s} mixing in unquenched lattice QCD employing the MILC Collaboration gauge configurations that include u, d, and s sea quarks based on the improved staggered quark (AsqTad) action and a highly improved gluon action. We implement the valence light quarks also with the AsqTad action and use the nonrelativistic NRQCD action for the valence b quark. We calculate hadronic matrix elements necessary for extracting Cabibbo-Kobayashi-Maskawa matrix elements from experimental measurements of mass differences {delta}M{sub d} and {delta}M{sub s}. We find {xi}{identical_to}f{sub B{sub s}}{radical}(B-circumflex{sub B{sub s}})/f{sub B{sub d}}{radical}(B-circumflex{sub B{sub d}})=1.258(33), f{sub B{sub d}}{radical}(B-circumflex{sub B{sub d}})=216(15) MeV, and f{sub B{sub s}}{radical}(B-circumflex{sub B{sub s}})=266(18) MeV. We also update previous results for decay constants and obtain f{sub B{sub d}}=190(13) MeV, f{sub B{sub s}}=231(15) MeV, and f{sub B{sub s}}/f{sub B{sub d}}=1.226(26). The new lattice results lead to updated values for the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |V{sub td}|/|V{sub ts}| and for the standard model prediction for Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -}) with reduced errors. We determine |V{sub td}|/|V{sub ts}|=0.214(1)(5) and Br(B{sub s}{yields}{mu}{sup +}{mu}{sup -})=3.19(19)x10{sup -9}.

  17. Putting words into action: A simple focused education improves prescription label comprehension and functional health literacy.

    PubMed

    Tai, Bik-Wai Bilvick; Bae, Yuna H; LaRue, Charles E; Law, Anandi V

    2016-01-01

    To assess the effectiveness of an educational intervention on prescription (Rx) label comprehension and functional health literacy (FHL) in older adults. Outcomes were compared between current and redesigned Rx labels. Additional objectives were to examine the correlation between 2 outcome measures and to determine the characterizing variables that are predictors for the outcome measures. Southern California, January 2013 to March 2015. Older adults (>55 y) taking 2 or more Rx medications daily were recruited at senior and community centers by a trained data collection team. The validated Modified LaRue Tool (MLT) tested Rx label comprehension before and after a short, focused educational intervention and correlated it with FHL. A simple one-on-one education provided by student pharmacists that was focused on critical elements of an Rx label. Short Test of Functional Health Literacy in Adults (STOFHLA) and MLT scores of all current and redesigned label participants at baseline and follow-up. Participants using redesigned Rx labels (n = 90) showed significantly higher MLT scores than with current Rx labels (n = 28) both before (23.0 ± 2.3 vs. 21.0 ± 2.4; P <0.001) and after educational intervention (23.8 ± 1.7 vs. 22.1 ± 3.1; P <0.001). With the use of analysis of covariance, intervention participants using redesigned label (n = 48) showed significant improvement in both MLT (23.1 ± 2.0 to 24.3 ± 1.0; P <0.001) and STOFHLA (29.8 ± 7.5 to 31.5 ± 5.7; P = 0.011) scores, whereas intervention participants using current Rx label (n = 16) did not show significant improvement in either MLT (P = 0.530) or STOFHLA (P = 0.215) scores. Effect size of intervention (redesigned label) was 0.77, indicating practical significance. MLT and STOFHLA scores were significantly correlated with each other, and age and education level were common significant predictors for both outcomes. Older adults using redesigned Rx labels showed improved Rx label comprehension and FHL after

  18. [Actions for improvement of medical safety by all parties involved in healthcare].

    PubMed

    Miyamoto, Atsushi

    2003-01-01

    How to prevent medical adverse events and augment the public's confidence in healthcare has become an urgent and one of the highest-priority medical policy issues in Japan. All parties involved in healthcare, such as medical institutions, companies that sell medical supplies and devices, educational institutions, and medical societies, are asked to work together cooperatively in their respective roles to ensure medical safety. Medical institutions, as the facilities that actually provide healthcare, are responsible for improving the safety and reliability of medical treatment. They must do this through appropriate supervision of their organizations and maintenance of their systems under the sound leadership of their management, and they must tackle safety measures by improving their organizations. Medical societies are expected not only to make scientific contributions but also to collect and evaluate information on the risks in their specialties and disseminate the information widely to their members. The national government must clarify the short- and long-term goals for promoting medical safety. At the same time, it must maintain the appropriate environment and coordinate the involvement of concerned parties in the achievement of those goals.

  19. Updated lattice results for parton distributions

    NASA Astrophysics Data System (ADS)

    Alexandrou, Constantia; Cichy, Krzysztof; Constantinou, Martha; Hadjiyiannakou, Kyriakos; Jansen, Karl; Steffens, Fernanda; Wiese, Christian

    2017-07-01

    We provide an analysis of the x dependence of the bare unpolarized, helicity, and transversity isovector parton distribution functions (PDFs) from lattice calculations employing (maximally) twisted mass fermions. The x dependence of the calculated PDFs resembles the one of the phenomenological parameterizations, a feature that makes this approach very promising. Furthermore, we apply momentum smearing for the relevant matrix elements to compute the lattice PDFs and find a large improvement factor when compared to conventional Gaussian smearing. This allows us to extend the lattice computation of the distributions to higher values of the nucleon momentum, which is essential for the prospects of a reliable extraction of the PDFs in the future.

  20. Excited Baryons from the FLIC Fermion Action

    SciTech Connect

    Melnitchouk, Wally; Hedditch, J N; Leinweber, D B; Williams, A G; Zanoti, J; Zhang, J B

    2002-06-01

    Masses of positive and negative parity excited nucleons and hyperons are calculated in quenched lattice QCD using an order (a{sup 2}) improved gluon action and a fat-link clover fermion action in which only the irrelevant operators are constructed with fat links. The results are in agreement with earlier N* simulations with improved actions, and exhibit a clear mass splitting between the nucleon and its parity partner, as well as a small mass splitting between the low-lying J{sup P}=1/2{sup -}N* states. Study of different Lambda interpolating fields suggests a similar splitting between the lowest two 1/2{sup -}Lambda* states, although the empirical mass suppression of the Lambda*(1405) is not seen.

  1. Actions on social determinants and interventions in primary health to improve mother and child health and health equity in Morocco.

    PubMed

    Boutayeb, Wiam; Lamlili, Mohamed; Maamri, Abdellatif; Ben El Mostafa, Souad; Boutayeb, Abdesslam

    2016-02-02

    Over the last two decades, Moroccan authorities launched a number of actions and strategies to enhance access to health services and improve health outcomes for the whole population in general and for mother and child in particular. The Ministry of Health launched the action plans 2008-2012 and 2012-2016 and created the maternal mortality surveillance system. The Moroccan government opted for national health coverage through a mandatory health insurance and a scheme of health assistance to the poorest households. Other initiatives were devoted indirectly to health by acting on social determinants of health and poverty reduction. In this paper, we present results of an evaluation of interventions and programmes and their impact on health inequity in Morocco. We used data provided by national surveys over the last decades, information released on the website of the Ministry of Health, documentation published by the Moroccan government and international reports and studies related to Morocco and published by international bodies like the World Health Organisation, United Nations Development Programme, United Nations Population Fund, UNICEF, UNESCO and the World Bank. A short review of scientific publications was also carried out in order to select papers published on health equity, social determinants, health system and interventions in primary health in Morocco. Inferential and descriptive statistics (including principal component analysis) were carried out using software SPSS version 18. The findings indicate that substantial achievements were obtained in terms of access to health care and health outcomes for the whole Moroccan population in general and for mothers and children in particular. However, achievements are unfairly distributed between advantaged and less advantaged regions, literate and illiterate women, rural and urban areas, and rich and poor segments of the Moroccan population. Studies have shown that it is difficult to trace the effect of a primary

  2. Neutron electric dipole moment with external electric field method in lattice QCD

    SciTech Connect

    Shintani, E.; Kanaya, K.; Aoki, S.; Ishizuka, N.; Kuramashi, Y.; Ukawa, A.; Yoshie, T.; Kikukawa, Y.; Okawa, M.

    2007-02-01

    We discuss a possibility that the neutron electric dipole moment (NEDM) can be calculated in lattice QCD simulations in the presence of the CP-violating {theta} term. In this paper we measure the energy difference between spin-up and spin-down states of the neutron in the presence of a uniform and static external electric field. We first test this method in quenched QCD with the renormalization group improved gauge action on a 16{sup 3}x32 lattice at a{sup -1}{approx_equal}2 GeV, employing two different lattice fermion formulations, the domain-wall fermion and the clover fermion for quarks, at relatively heavy quark mass (m{sub PS}/m{sub V}{approx_equal}0.85). We obtain nonzero values of the NEDM from calculations with both fermion formulations. We next consider some systematic uncertainties of our method for the NEDM, using 24{sup 3}x32 lattice at the same lattice spacing only with the clover fermion. We finally investigate the quark mass dependence of the NEDM and observe a nonvanishing behavior of the NEDM toward the chiral limit. We interpret this behavior as a manifestation of the pathology in the quenched approximation.

  3. Improving student performance in an introductory biology majors course: A social action project in the scholarship of teaching

    NASA Astrophysics Data System (ADS)

    Chambers, Sara Lang Ketchum

    This social action study followed an introductory biology course for a three-year period to determine whether changes in teaching personnel, instructional techniques and reorientation to student-centered learning would impact student performance. The course was redirected from a traditional lecture-laboratory format to one emphasizing active learning inquiry methods. Student retention, achievement, and failure were observed for three years in addition to one year prior, and one year following, the study. The study examined the two semester introductory biology course required of all biology majors and those intending a career in science, medicine or dentistry. During the first semester of the study, the dropout rate decreased from 46% to 21%. Prior to the study, 39% of the students completing the course received a grade of D or F while only 4% received a grade of B or above. During the first semester of the study 14% of the students received a grade of D or F while 46% received a B, B+ or A grade. Similar results were seen in other semesters of the study. A statistical comparison of student retention and performance was carried out using grade data for classes taught by the original faculty, the action study faculty and the post-study faculty. The differences between the original faculty and the action study faculty were statistically significant. Effect size calculations indicated large differences between the action study faculty and the two other faculty groups in terms of student retention, achievement and failure. The results are attributed to both the personnel change and, more significantly, the change in teaching methods and emphasis on student-active learning. Comparison between the pre- and post-study teams showed less dramatic effect sizes than when the action study data were compared with the data from either other team. Nevertheless, the post-study results showed that although the retention rate dropped during the year after the study, the improvement

  4. Colloquium: Physics of optical lattice clocks

    NASA Astrophysics Data System (ADS)

    Derevianko, Andrei; Katori, Hidetoshi

    2011-04-01

    Recently invented and demonstrated optical lattice clocks hold great promise for improving the precision of modern time keeping. These clocks aim at the 10-18 fractional accuracy, which translates into a clock that would neither lose nor gain a fraction of a second over an estimated age of the Universe. In these clocks, millions of atoms are trapped and interrogated simultaneously, dramatically improving clock stability. Here the principles of operation of these clocks are discussed and, in particular, a novel concept of magic trapping of atoms in optical lattices. Recently proposed microwave lattice clocks are also highlights and several applications that employ the optical lattice clocks as a platform for precision measurements and quantum information processing.

  5. Enumerations of Lattice Animals and Trees

    NASA Astrophysics Data System (ADS)

    Jensen, Iwan

    2001-02-01

    We have developed an improved algorithm that allows us to enumerate the number of site animals on the square lattice up to size 46. We also calculate the number of lattice trees up to size 44 and the radius of gyration of both lattice animals and trees up to size 42. Analysis of the resulting series yields an improved estimate, λ=4.062570(8), for the growth constant of lattice animals, and, λ0=3.795254(8), for the growth constant of trees, and confirms to a very high degree of certainty that both the animal and tree generating functions have a logarithmic divergence. Analysis of the radius of gyration series yields the estimate, ν=0.64115(5), for the size exponent.

  6. Colloquium: Physics of optical lattice clocks

    SciTech Connect

    Derevianko, Andrei; Katori, Hidetoshi

    2011-04-01

    Recently invented and demonstrated optical lattice clocks hold great promise for improving the precision of modern time keeping. These clocks aim at the 10{sup -18} fractional accuracy, which translates into a clock that would neither lose nor gain a fraction of a second over an estimated age of the Universe. In these clocks, millions of atoms are trapped and interrogated simultaneously, dramatically improving clock stability. Here the principles of operation of these clocks are discussed and, in particular, a novel concept of magic trapping of atoms in optical lattices. Recently proposed microwave lattice clocks are also highlights and several applications that employ the optical lattice clocks as a platform for precision measurements and quantum information processing.

  7. Earth Science Informatics Community Requirements for Improving Sustainable Science Software Practices: User Perspectives and Implications for Organizational Action

    NASA Astrophysics Data System (ADS)

    Downs, R. R.; Lenhardt, W. C.; Robinson, E.

    2014-12-01

    Science software is integral to the scientific process and must be developed and managed in a sustainable manner to ensure future access to scientific data and related resources. Organizations that are part of the scientific enterprise, as well as members of the scientific community who work within these entities, can contribute to the sustainability of science software and to practices that improve scientific community capabilities for science software sustainability. As science becomes increasingly digital and therefore, dependent on software, improving community practices for sustainable science software will contribute to the sustainability of science. Members of the Earth science informatics community, including scientific data producers and distributers, end-user scientists, system and application developers, and data center managers, use science software regularly and face the challenges and the opportunities that science software presents for the sustainability of science. To gain insight on practices needed for the sustainability of science software from the science software experiences of the Earth science informatics community, an interdisciplinary group of 300 community members were asked to engage in simultaneous roundtable discussions and report on their answers to questions about the requirements for improving scientific software sustainability. This paper will present an analysis of the issues reported and the conclusions offered by the participants. These results provide perspectives for science software sustainability practices and have implications for actions that organizations and their leadership can initiate to improve the sustainability of science software.

  8. Development of Team Action Projects in Surgery (TAPS): a multilevel team-based approach to teaching quality improvement.

    PubMed

    Waits, Seth A; Reames, Bradley N; Krell, Robert W; Bryner, Benjamin; Shih, Terry; Obi, Andrea T; Henke, Peter K; Minter, Rebecca M; Englesbe, Michael J; Wong, Sandra L

    2014-01-01

    To meet the Accreditation Council for Graduate Medical Education core competency in Practice-Based Learning and Improvement, educational curricula need to address training in quality improvement (QI). We sought to establish a program to train residents in the principles of QI and to provide practical experiences in developing and implementing improvement projects. We present a novel approach for engaging students, residents, and faculty in QI efforts-Team Action Projects in Surgery (TAPS). Large academic medical center and health system. Multiple teams consisting of undergraduate students, medical students, surgery residents, and surgery faculty were assembled and QI projects developed. Using "managing to learn" Lean principles, these multilevel groups approached each project with robust data collection, development of an A3, and implementation of QI activities. A total of 5 resident led QI projects were developed during the TAPS pilot phase. These included a living kidney donor enhanced recovery protocol, consult improvement process, venous thromboembolism prophylaxis optimization, Clostridium difficile treatment standardization, and understanding variation in operative duration of laparoscopic cholecystectomy. Qualitative and quantitative assessment showed significant value for both the learner and stakeholders of QI related projects. Through the development of TAPS, we demonstrate a novel approach to addressing the increasing focus on QI within graduate medical education. Efforts to expand this multilevel team based approach would have value for teachers and learners alike. Copyright © 2014. Published by Elsevier Inc.

  9. Uncertainty evaluation of EnPIs in industrial applications as a key factor in setting improvement actions

    NASA Astrophysics Data System (ADS)

    D'Emilia, G.; Di Gasbarro, D.; Gaspari, A.; Natale, E.

    2015-11-01

    A methodology is proposed assuming high-level Energy Performance Indicators (EnPIs) uncertainty as quantitative indicator of the evolution of an Energy Management System (EMS). Motivations leading to the selection of the EnPIs, uncertainty evaluation techniques and criteria supporting decision-making are discussed, in order to plan and pursue reliable measures for energy performance improvement. In this paper, problems, priorities, operative possibilities and reachable improvement limits are examined, starting from the measurement uncertainty assessment. Two different industrial cases are analysed with reference to the following aspects: absence/presence of energy management policy and action plans; responsibility level for the energy issues; employees’ training and motivation in respect of the energy problems; absence/presence of adequate infrastructures for monitoring and sharing of energy information; level of standardization and integration of methods and procedures linked to the energy activities; economic and financial resources for the improvement of energy efficiency. A critic and comparative analysis of the obtained results is realized. The methodology, experimentally validated, allows developing useful considerations for effective, realistic and economically feasible improvement plans, depending on the specific situation. Recursive application of the methodology allows getting reliable and resolved assessment of the EMS status, also in dynamic industrial contexts.

  10. [A 6-year evaluation of dyslipidemia in a health center: Importance of improvement actions].

    PubMed

    Antón-García, F; Correcher-Salvador, E; Rodríguez-Lagos, F A; González-Caminero, S

    2014-01-01

    Dyslipidemia, especially an increased LDL-cholesterol, has been shown to be one of the most important risk factors in the genesis of coronary involvement. The prevalence of dyslipidemias in Spain is high. The objective of this study is to assess the progress of dyslipidemic patients in our health center over a 6-year period, and see if there has been any improvement in its control after the presentation of the evaluation of the first 3 years, as well as an updated dyslipidemia protocol. Assessment Period 1 (2006-2008): 267 patients with dyslipidemia. Assessment Period 2 (2009-2011): 222 patients, excluding exitus and address changes. age, sex, personal history of CVD, vascular risk factors, lipids, drug treatment, risk levels, and percentages of CV control objectives. Mean age was 66.2 years (SD 13.4), 66.3% women. Period 1-Period 2: Total cholesterol: 221.9-196.6 mg/dl (P=.000); LDL-cholesterol: 147.9-115.8 mg/dl (P=.000). In high risk patients, therapeutic targets: 14-50.5% (P=.024); medium risk: 35-68.1% (P=.038); low risk: 44-68.2% (P=NS). Pharmacotherapy 68-77% (P=.000). Changing treatment: 30-43% (P=.001). Adherence: 75-86% (P=.003). Untreated high risk: 15.4-16.3% (P=NS). There was a significant improvement in Period 2, especially in high-risk patients, after presenting the results of the evaluation for Period 1 and with the updated dyslipidemia protocol. There are high risk patients without lipid-lowering treatment to be detected and reviewed. Copyright © 2013 Sociedad Española de Médicos de Atención Primaria (SEMERGEN). Publicado por Elsevier España. All rights reserved.

  11. Air Quality Improvement in a Megacity: Implications from 2015 Beijing Parade Blue Pollution-Control Actions

    NASA Astrophysics Data System (ADS)

    Xu, W.; Song, W.; Zhang, Y.; Liu, X.; Zhang, L.; Zhao, Y.; Liu, D.; Tang, A.; Wang, D.; Zhang, W.; Pan, Y.; Fowler, D.; Erisman, J. W.; Collett, J. L., Jr.; Goulding, K.; Li, Y.; Zhang, F.

    2016-12-01

    The implementation of strict emission control measures in Beijing and surrounding regions during the 2015 China Victory Day Parade provided a valuable opportunity to investigate related air quality improvements in a megacity. We measured NH3, NO2 and PM2.5 at multiple sites in and outside Beijing and summarized concentrations of PM2.5, PM10, NO2, SO2 and CO in 291 cities across China from a national urban air quality monitoring network between August and September 2015. Consistently significant reductions of 12-35% for NH3 and 33-59% for NO2 in different areas of Beijing city during the emission control period (referred to as the Parade Blue period) were observed compared with measurements in the pre- and post-Parade Blue periods without emission controls. Average NH3 and NO2 concentrations at sites near traffic were strongly correlated and showed positive and significant responses to traffic reduction measures, suggesting that traffic is an important source of both NH3 and NOx in urban Beijing. Daily concentrations of PM2.5 and secondary inorganic aerosol (sulfate, ammonium, and nitrate) at the urban and rural sites both decreased during the Parade Blue period. Concentrations of PM2.5, PM10, NO2, SO2 and CO from the national city-monitoring network showed the largest decrease (34-72%) in Beijing, a smaller decrease (1-32%) in North China (excluding Beijing), and an increase (6-16%) in other regions of China during the emission control period. Integrated analysis of modeling and monitoring results demonstrated that emission control measures made a major contribution to air quality improvement in Beijing compared with a minor contribution from favorable meteorological conditions during the Parade Blue period. These results show that controls of secondary aerosol precursors (NH3, SO2 and NOx) locally and regionally are key to curbing air pollution in Beijing and probably in other mega cities worldwide.

  12. Modeling pions on the lattice

    NASA Astrophysics Data System (ADS)

    Cecile, D. J.

    In Quantum Chromodynamics (QCD), the pions are the lightest bound states. Current lattice QCD calculations are not able to study pions at realistic masses due to algorithmic difficulties. Instead, lattice studies are limited to unphysically large pion masses, and Chiral Perturbation Theory (ChPT) is often relied upon to extrapolate lattice results to the phenomenological regime and to the chiral limit, where quarks are massless. One of the outstanding problems in the field is to determine the range of quark masses where ChPT is valid and to understand the nonperturbative physics that may cause ChPT to break down. Given the difficulty of studying QCD, it is interesting and useful to construct a lattice field theory model of pions, which would allow a direct lattice calculation without the need for chiral extrapolations. This model can be used to evaluate the reliability of chiral extrapolations as applied to lattice data in the context of a lattice field theory that is exactly solvable numerically even at small quark masses and in the chiral limit. In this light, to create a model of pions of two-flavor Quantum Chromodynamics (QCD), a lattice field theory involving two flavors of staggered quarks interacting strongly with Abelian gauge fields is constructed. In the chiral limit, this theory exhibits a SUL(2) x SU R(2) x UA(1) symmetry. The UA(1) symmetry can be broken by introducing a four-fermion term into the action, thereby incorporating the physics of the QCD anomaly. To qualify as a meaningful model of QCD, this lattice model must exhibit spontaneous chiral symmetry breaking and confinement and must have a continuum limit. An interesting mechanism is introduced to address the continuum limit. In particular, an extra dimension allows one to tune a fictitious temperature in order to access a phase of broken symmetry and to find a range where the pion decay constant is much smaller than the lattice cutoff, i.e. Fpi ≪1a . Unlike lattice QCD, a major advantage of

  13. Dissipative photonic lattice solitons.

    PubMed

    Ultanir, Erdem A; Stegeman, George I; Christodoulides, Demetrios N

    2004-04-15

    We show that discrete dissipative optical lattice solitons are possible in waveguide array configurations that involve periodically patterned semiconductor optical amplifiers and saturable absorbers. The characteristics of these low-power soliton states are investigated, and their propagation constant eigenvalues are mapped on Floquet-Bloch band diagrams. The prospect of observing such low-power dissipative lattice solitons is discussed in detail.

  14. Air quality improvement in a megacity: implications from 2015 Beijing Parade Blue pollution control actions

    NASA Astrophysics Data System (ADS)

    Xu, Wen; Song, Wei; Zhang, Yangyang; Liu, Xuejun; Zhang, Lin; Zhao, Yuanhong; Liu, Duanyang; Tang, Aohan; Yang, Daowei; Wang, Dandan; Wen, Zhang; Pan, Yuepeng; Fowler, David; Collett, Jeffrey L., Jr.; Erisman, Jan Willem; Goulding, Keith; Li, Yi; Zhang, Fusuo

    2017-01-01

    The implementation of strict emission control measures in Beijing and surrounding regions during the 2015 China Victory Day Parade provided a valuable opportunity to investigate related air quality improvements in a megacity. We measured NH3, NO2 and PM2.5 at multiple sites in and outside Beijing and summarized concentrations of PM2.5, PM10, NO2, SO2 and CO in 291 cities across China from a national urban air quality monitoring network between August and September 2015. Consistently significant reductions of 12-35 % for NH3 and 33-59 % for NO2 in different areas of Beijing during the emission control period (referred to as the Parade Blue period) were observed compared with measurements in the pre- and post-Parade Blue periods without emission controls. Average NH3 and NO2 concentrations at sites near traffic were strongly correlated and showed positive and significant responses to traffic reduction measures, suggesting that traffic is an important source of both NH3 and NOx in urban Beijing. Daily concentrations of PM2.5 and secondary inorganic aerosol (sulfate, ammonium and nitrate) at the urban and rural sites both decreased during the Parade Blue period. During (after) the emission control period, concentrations of PM2.5, PM10, NO2, SO2 and CO from the national city-monitoring network showed the largest decrease (increase) of 34-72 % (50-214 %) in Beijing, a smaller decrease (a moderate increase) of 1-32 % (16-44 %) in emission control regions outside Beijing and an increase (decrease) of 6-16 % (-2-7 %) in non-emission-control regions of China. Integrated analysis of modelling and monitoring results demonstrated that emission control measures made a major contribution to air quality improvement in Beijing compared with a minor contribution from favourable meteorological conditions during the Parade Blue period. These results show that controls of secondary aerosol precursors (NH3, SO2 and NOx) locally and regionally are key to curbing air pollution in Beijing

  15. Action research to improve methods of delivery and feedback in an Access Grid Room environment

    NASA Astrophysics Data System (ADS)

    McArthur, Lynne C.; Klass, Lara; Eberhard, Andrew; Stacey, Andrew

    2011-12-01

    This article describes a qualitative study which was undertaken to improve the delivery methods and feedback opportunity in honours mathematics lectures which are delivered through Access Grid Rooms. Access Grid Rooms are facilities that provide two-way video and audio interactivity across multiple sites, with the inclusion of smart boards. The principal aim was to improve the student learning experience, given the new environment. The specific aspects of the course delivery that the study focused on included presentation of materials and provision of opportunities for interaction between the students and between students and lecturers. The practical considerations in the delivery of distance learning are well documented in the literature, and similar problems arise in the Access Grid Room environment; in particular, those of limited access to face-to-face interaction and the reduction in peer support. The nature of the Access Grid Room classes implies that students studying the same course can be physically situated in different cities, and possibly in different countries. When studying, it is important that students have opportunity to discuss new concepts with others; particularly their peers and their lecturer. The Access Grid Room environment also presents new challenges for the lecturer, who must learn new skills in the delivery of materials. The unique nature of Access Grid Room technology offers unprecedented opportunity for effective course delivery and positive outcomes for students, and was developed in response to a need to be able to interact with complex data, other students and the instructor, in real-time, at a distance and from multiple sites. This is a relatively new technology and as yet there has been little or no studies specifically addressing the use and misuse of the technology. The study found that the correct placement of cameras and the use of printed material and smart boards were all crucial to the student experience. In addition, the

  16. Fucoidan Supplementation Improves Exercise Performance and Exhibits Anti-Fatigue Action in Mice

    PubMed Central

    Chen, Yi-Ming; Tsai, Yi-Hsin; Tsai, Tsung-Yu; Chiu, Yen-Shuo; Wei, Li; Chen, Wen-Chyuan; Huang, Chi-Chang

    2014-01-01

    Fucoidan (FCD) is a well-known bioactive constituent of seaweed extract that possess a wide spectrum of activities in biological systems, including anti-cancer, anti-inflammation and modulation of immune systems. However, evidence on the effects of FCD on exercise performance and physical fatigue is limited. Therefore, we investigated the potential beneficial effects of FCD on ergogenic and anti-fatigue functions following physiological challenge. Male ICR mice from three groups (n = 8 per group) were orally administered FCD for 21 days at 0, 310 and 620 mg/kg/day, which were, respectively, designated the vehicle, FCD-1X and FCD-2X groups. The results indicated that the FCD supplementations increased the grip strength (p = 0.0002) and endurance swimming time (p = 0.0195) in a dose-depend manner. FCD treatments also produced dose-dependent decreases in serum levels of lactate (p < 0.0001) and ammonia (p = 0.0025), and also an increase in glucose level (p < 0.0001) after the 15-min swimming test. In addition, FCD supplementation had few subchronic toxic effects. Therefore, we suggest that long-term supplementation with FCD can have a wide spectrum of bioactivities on health promotion, performance improvement and anti-fatigue. PMID:25558908

  17. Fucoidan supplementation improves exercise performance and exhibits anti-fatigue action in mice.

    PubMed

    Chen, Yi-Ming; Tsai, Yi-Hsin; Tsai, Tsung-Yu; Chiu, Yen-Shuo; Wei, Li; Chen, Wen-Chyuan; Huang, Chi-Chang

    2014-12-31

    Fucoidan (FCD) is a well-known bioactive constituent of seaweed extract that possess a wide spectrum of activities in biological systems, including anti-cancer, anti-inflammation and modulation of immune systems. However, evidence on the effects of FCD on exercise performance and physical fatigue is limited. Therefore, we investigated the potential beneficial effects of FCD on ergogenic and anti-fatigue functions following physiological challenge. Male ICR mice from three groups (n = 8 per group) were orally administered FCD for 21 days at 0, 310 and 620 mg/kg/day, which were, respectively, designated the vehicle, FCD-1X and FCD-2X groups. The results indicated that the FCD supplementations increased the grip strength (p = 0.0002) and endurance swimming time (p = 0.0195) in a dose-depend manner. FCD treatments also produced dose-dependent decreases in serum levels of lactate (p < 0.0001) and ammonia (p = 0.0025), and also an increase in glucose level (p < 0.0001) after the 15-min swimming test. In addition, FCD supplementation had few subchronic toxic effects. Therefore, we suggest that long-term supplementation with FCD can have a wide spectrum of bioactivities on health promotion, performance improvement and anti-fatigue.

  18. Vitamin E Analogue Improves Rabbit Sperm Quality during the Process of Cryopreservation through Its Antioxidative Action

    PubMed Central

    Zhu, Zhendong; Fan, Xiaoteng; Lv, Yinghua; Zhang, Nan; Fan, Chuning; Zhang, Pengfei; Zeng, Wenxian

    2015-01-01

    The process of cryopreservation results in high concentration of reactive oxygen species which is detrimental to spermatozoa. The aim of this study was to investigate whether addition of vitamin E analogue to freezing extender can facilitate the cryosurvival of spermatozoa in rabbits, and how vitamin E protects spermatozoa against damages during the process of preservation. Freshly ejaculated semen was diluted with Tris-citrate-glucose extender supplemented with different concentrations of Trolox (a vitamin E analogue). The level of radical oxygen species (ROS) in spermatozoa that was exposed to Trolox was significantly lower than that of the control during each step of the process of preservation. The percentage of frozen-thawed spermatozoa with lipid peroxidation in the Trolox treatments was significantly lower than that of the control. The motility, intact acrosome, membrane integrity and mitochondrial potentials of the frozen-thawed spermatozoa in the treatment of 200 μM Trolox were significantly higher than those of the control. These observations suggest that addition of vitamin E to a freezing extender leads to higher integrity of acrosome, plasma membrane and mitochondrial membrane potential as well as higher motility. Vitamin E protects spermatozoa through its capacity to quench ROS accumulation and lipid peroxidation during the process of preservation. Addition of Trolox is recommended to facilitate the improvement of semen preservation for the rabbit breeding industry. PMID:26700473

  19. Use of a bilayer lattice-matched AlInGaN barrier for improving the channel carrier confinement of enhancement-mode AlInGaN/GaN hetero-structure field-effect transistors

    NASA Astrophysics Data System (ADS)

    Rahbardar Mojaver, Hassan; Gosselin, Jean-Lou; Valizadeh, Pouya

    2017-06-01

    A quaternary lattice-matched layer structure based on employing a bilayer barrier for improving the carrier confinement in the channel of enhancement-mode metal-face c-plane wurtzite AlInGaN/GaN hetero-structure field effect transistors (HFETs) is for the first time proposed. Using the commercial self-consistent Poisson-Schrödinger solver Nextnano, electronic properties of the proposed hetero-structure, including the sheet charge density and carrier confinement on the GaN side of the hetero-interface, are evaluated. Based on these evaluations, it is shown that while the proposed layer structure substantially improves the carrier confinement in the GaN channel layer, it also upholds the merits of employing a lattice-matched barrier towards achieving an enhancement-mode operation (i.e., in the absence of the piezoelectric effect). According to these simulations, in terms of maintaining the required positive threshold-voltage for the enhancement-mode operation, it is also shown that the proposed layer structure substantially outperforms the quaternary AlInGaN/GaN HFETs employing a thin AlN spacer layer.

  20. Improving availability of and access to opioids in Colombia: description and preliminary results of an action plan for the country.

    PubMed

    Leon, Marta Ximena; De Lima, Liliana; Florez, Sandra; Torres, Marcela; Daza, Marcela; Mendoza, Lina; Agudelo, Natalia; Guerra, Laura; Ryan, Karen

    2009-11-01

    Latin America consumes less than 2.7% of the morphine in the world, as reported by the governments to the International Narcotics Control Board. Methods to improve access to opioids for the treatment of pain have been developed by the Pain & Policy Studies Group (PPSG), a World Health Organization Collaborating Center at the University of Wisconsin. This article describes the preparation and implementation of an action plan in Colombia as a part of an international fellowship program on opioid policy developed by the PPSG and funded by the Open Society Institute. The action plan for Colombia included three steps: 1) a survey of regulators and health care providers to identify the current situation and their perceptions of opioid availability in the regions of the country; 2) a workshop with representatives of the Ministry of Health, the national and state competent authorities, pain and palliative care physicians, and international leaders; and 3) implementation workshops at the local level throughout the country. For the survey, response rates of 47% and 96% were registered among physicians and competent authorities, respectively. The survey identified significant regional differences in perceived opioid availability between physicians and regulators. Focus group discussions during the workshop identified several reasons leading to limited availability of opioids in the country, including deficiencies in the procurement process, insufficient human resources, excessive bureaucratic tasks, insufficient number of pharmacies authorized to dispense controlled medications in the country, lack of training in the health care professions, and overly restrictive laws and regulations governing opioid availability. The third step of the action plan has not been implemented. Additional and continuous monitoring needs to be implemented to measure the progress of this project.

  1. Finite-size effect in lattice QCD hadron spectroscopy

    SciTech Connect

    Fukugita, M.; Mino, H.; Okawa, M.; Ukawa, A. Faculty of Engineering, Yamanashi University, Kofu 400 National Laboratory for High Energy Physics , Ibaraki 305 Institute of Physics, University of Tsukuba, Ibaraki 305 )

    1992-02-10

    A hadron spectrum calculation with two light dynamical quark flavors was carried out with the Kogut-Susskind quark action at {beta}=5.7 on lattices of spatial size 8{sup 3}, 12{sup 3}, and 20{sup 3} for {ital m}{sub {ital q}}=0.01 and 0.02 in lattice units, with emphasis given to a systematic study of the finite-lattice-size effect. It is found that hadron masses on a 16{sup 3} spatial lattice at this {beta} still suffer from a significant finite-lattice effect at least for {ital m}{sub {ital q}}=0.01, showing the importance of a quantitative control over the finite-size effect in comparing simulation results with the experimental hadron masses even for a fairly large lattice. A comparison is also made to the analytic prediction for the finite-size effect from chiral perturbation theory.

  2. Threat to the point: improving the value of comparative extinction risk analysis for conservation action.

    PubMed

    Murray, Kris A; Verde Arregoitia, Luis D; Davidson, Ana; Di Marco, Moreno; Di Fonzo, Martina M I

    2014-02-01

    Comparative extinction risk analysis is a common approach for assessing the relative plight of biodiversity and making conservation recommendations. However, the usefulness of such analyses for conservation practice has been questioned. One reason for underperformance may be that threats arising from global environmental changes (e.g., habitat loss, invasive species, climate change) are often overlooked, despite being widely regarded as proximal drivers of species' endangerment. We explore this problem by (i) reviewing the use of threats in this field and (ii) quantitatively investigating the effects of threat exclusion on the interpretation and potential application of extinction risk model results. We show that threat variables are routinely (59%) identified as significant predictors of extinction risk, yet while most studies (78%) include extrinsic factors of some kind (e.g., geographic or bioclimatic information), the majority (63%) do not include threats. Despite low overall usage, studies are increasingly employing threats to explain patterns of extinction risk. However, most continue to employ methods developed for the analysis of heritable traits (e.g., body size, fecundity), which may be poorly suited to the treatment of nonheritable predictors including threats. In our global mammal and continental amphibian extinction risk case studies, omitting threats reduced model predictive performance, but more importantly (i) reduced mechanistic information relevant to management; (ii) resulted in considerable disagreement in species classifications (12% and 5% for amphibians and mammals, respectively, translating to dozens and hundreds of species); and (iii) caused even greater disagreement (20-60%) in a downstream conservation application (species ranking). We conclude that the use of threats in comparative extinction risk analysis is important and increasing but currently in the early stages of development. Priorities for future studies include improving uptake

  3. Improved photodynamic action of nanoparticles loaded with indium (III) phthalocyanine on MCF-7 breast cancer cells

    NASA Astrophysics Data System (ADS)

    Souto, Carlos Augusto Zanoni; Madeira, Klésia Pirola; Rettori, Daniel; Baratti, Mariana Ozello; Rangel, Letícia Batista Azevedo; Razzo, Daniel; da Silva, André Romero

    2013-09-01

    Indium (III) phthalocyanine (InPc) was encapsulated into nanoparticles of PEGylated poly( d, l-lactide-co-glycolide) (PLGA-PEG) to improve the photobiological activity of the photosensitizer. The efficacy of nanoparticles loaded with InPc and their cellular uptake was investigated with MCF-7 breast tumor cells, and compared with the free InPc. The influence of photosensitizer (PS) concentration (1.8-7.5 μmol/L), incubation time (1-2 h), and laser power (10-100 mW) were studied on the photodynamic effect caused by the encapsulated and the free InPc. Nanoparticles with a size distribution ranging from 61 to 243 nm and with InPc entrapment efficiency of 72 ± 6 % were used in the experiments. Only the photodynamic effect of encapsulated InPc was dependent on PS concentration and laser power. The InPc-loaded nanoparticles were more efficient in reducing MCF-7 cell viability than the free PS. For a light dose of 7.5 J/cm2 and laser power of 100 mW, the effectiveness of encapsulated InPc to reduce the viability was 34 ± 3 % while for free InPc was 60 ± 7 %. Confocal microscopy showed that InPc-loaded nanoparticles, as well as free InPc, were found throughout the cytosol. However, the nanoparticle aggregates and the aggregates of free PS were found in the cell periphery and outside of the cell. The nanoparticles aggregates were generated due to the particles concentration used in the experiment because of the small loading of the InPc while the low solubility of InPc caused the formation of aggregates of free PS in the culture medium. The participation of singlet oxygen in the photocytotoxic effect of InPc-loaded nanoparticles was corroborated by electron paramagnetic resonance experiments, and the encapsulation of photosensitizers reduced the photobleaching of InPc.

  4. Metformin Improves Insulin Signaling in Obese Rats via Reduced IKKbeta Action in a Fiber-Type Specific Manner.

    PubMed

    Bikman, Benjamin T; Zheng, Donghai; Kane, Daniel A; Anderson, Ethan J; Woodlief, Tracey L; Price, Jesse W; Dohm, G Lynis; Neufer, P Darrell; Cortright, Ronald N

    2010-01-01

    Metformin is a widely used insulin-sensitizing drug, though its mechanisms are not fully understood. Metformin has been shown to activate AMPK in skeletal muscle; however, its effects on the inhibitor of kappaB kinasebeta (IKKbeta) in this same tissue are unknown. The aim of this study was to (1) determine the ability of metformin to attenuate IKKbeta action, (2) determine whether changes in AMPK activity are associated with changes in IKKbeta action in skeletal muscle, and (3) examine whether changes in AMPK and IKKbeta function are consistent with improved insulin signaling. Lean and obese male Zuckers received either vehicle or metformin by oral gavage daily for four weeks (four groups of eight). Proteins were measured in white gastrocnemius (WG), red gastrocnemius (RG), and soleus. AMPK phosphorylation increased (P < .05) in WG in both lean (57%) and obese (106%), and this was supported by an increase in phospho-ACC in WG. Further, metformin increased IkappaBalpha levels in both WG (150%) and RG (67%) of obese rats, indicative of reduced IKKbeta activity (P < .05), and was associated with reduced IRS1-pSer(307) (30%) in the WG of obese rats (P < .02). From these data we conclude that metformin treatment appears to exert an inhibitory influence on skeletal muscle IKKbeta activity, as evidenced by elevated IkappaBalpha levels and reduced IRS1-Ser(307) phosphorylation in a fiber-type specific manner.

  5. Metformin Improves Insulin Signaling in Obese Rats via Reduced IKKβ Action in a Fiber-Type Specific Manner

    PubMed Central

    Bikman, Benjamin T.; Zheng, Donghai; Kane, Daniel A.; Anderson, Ethan J.; Woodlief, Tracey L.; Price, Jesse W.; Dohm, G. Lynis; Neufer, P. Darrell; Cortright, Ronald N.

    2010-01-01

    Metformin is a widely used insulin-sensitizing drug, though its mechanisms are not fully understood. Metformin has been shown to activate AMPK in skeletal muscle; however, its effects on the inhibitor of κB kinaseβ (IKKβ) in this same tissue are unknown. The aim of this study was to (1) determine the ability of metformin to attenuate IKKβ action, (2) determine whether changes in AMPK activity are associated with changes in IKKβ action in skeletal muscle, and (3) examine whether changes in AMPK and IKKβ function are consistent with improved insulin signaling. Lean and obese male Zuckers received either vehicle or metformin by oral gavage daily for four weeks (four groups of eight). Proteins were measured in white gastrocnemius (WG), red gastrocnemius (RG), and soleus. AMPK phosphorylation increased (P < .05) in WG in both lean (57%) and obese (106%), and this was supported by an increase in phospho-ACC in WG. Further, metformin increased IκBα levels in both WG (150%) and RG (67%) of obese rats, indicative of reduced IKKβ activity (P < .05), and was associated with reduced IRS1-pSer307 (30%) in the WG of obese rats (P < .02). From these data we conclude that metformin treatment appears to exert an inhibitory influence on skeletal muscle IKKβ activity, as evidenced by elevated IκBα levels and reduced IRS1-Ser307 phosphorylation in a fiber-type specific manner. PMID:20798864

  6. Lattice Calculations of Nucleon Form Factors

    SciTech Connect

    Syritsyn, S. N.

    2011-10-24

    We present recent results of calculation of the isovector electromagnetic and axial form factors of the nucleon using lattice QCD with three different lattice actions and pion masses down to m{sub {pi}} > or approx. 300 MeV. Because of the precision of our high-statistics calculations, we can test predictions of baryon chiral perturbation theory for the charge and axial radii of the nucleon. We find that currently available baryon ChPT calculations disagree with our data, indicating that the corresponding effective theory approximations are not valid above m{sub {pi}{approx_equal}3}00 MeV.

  7. Improving community health through marketing exchanges: A participatory action research study on water, sanitation, and hygiene in three Melanesian countries.

    PubMed

    Barrington, D J; Sridharan, S; Saunders, S G; Souter, R T; Bartram, J; Shields, K F; Meo, S; Kearton, A; Hughes, R K

    2016-12-01

    Diseases related to poor water, sanitation and hygiene (WaSH) are major causes of mortality and morbidity. While pursuing marketing approaches to WaSH to improve health outcomes is often narrowly associated with monetary exchange, marketing theory recognises four broad marketing exchange archetypes: market-based, non-market-based, command-based and culturally determined. This diversity reflects the need for parameters broader than monetary exchange when improving WaSH. This study applied a participatory action research process to investigate how impoverished communities in Melanesian urban and peri-urban informal settlements attempt to meet their WaSH needs through marketing exchange. Exchanges of all four archetypes were present, often in combination. Motivations for participating in the marketing exchanges were based on social relationships alongside WaSH needs, health aspirations and financial circumstances. By leveraging these motivations and pre-existing, self-determined marketing exchanges, WaSH practitioners may be able to foster WaSH marketing exchanges consistent with local context and capabilities, in turn improving community physical, mental and social health. Copyright © 2016 Elsevier Ltd. All rights reserved.

  8. Developing Online Course Portal to Improve Teachers’ Competency in Creating Action Research (CAR) Proposal Using Learning Management System (LMS) Moodle

    NASA Astrophysics Data System (ADS)

    Muhtar, A. A.

    2017-02-01

    Online course can offer flexible and easy way to improve teachers’ competency in conducting education research, especially in classroom action research (CAR). Teachers can attend the course without physically present in the class. This research aims to (1) develop online course portal to improve teachers’ competency in creating CAR proposal, and (2) produce proper online course portal validated and evaluated from four aspects: learning process, content, graphic user interface and programming. Online course in this research developed using Learning Management System (LMS) Moodle. The research model is using modified Borg & Gall Research and Development (R&D) started from preliminary studies, designing product, creating product, and evaluation. Product validated by three experts from three universities. Research subjects for field test are seven teachers as participants from different schools in several provinces in Indonesia. Based on expert validation and field test results, the product developed in this research categorized as “very good” in all aspects and it is suitable for teacher to improve their competency in creating CAR proposal. Online course portal produced in this research can be used as a proper model for online learning in creating CAR proposal.

  9. The 40 donors per million population plan: an action plan for improvement of organ donation and transplantation in Spain.

    PubMed

    Matesanz, R; Marazuela, R; Domínguez-Gil, B; Coll, E; Mahillo, B; de la Rosa, G

    2009-10-01

    Spain has been showing the highest rate of deceased donor organ recovery in the world for a whole country, namely, 33-35 donors per million population (pmp) during the last years. This activity is attributed to the so-called Spanish Model of organ donation, an integrated approach to improve organ donation since the start of the Organización Nacional de Trasplantes (ONT) in 1989. However, in 2007 there were 7/17 regions with >40 donors pmp and a marked regional variability. Thus, ONT has set a large-scale, comprehensive strategy to achieve a substantial improvement in donation and transplantation in Spain in the coming years: The 40 Donors pmp Plan. The overall objective is to increase the average rate of deceased donors to 40 pmp between 2008 and 2010. The areas of improvement, specific objectives, and actions have come from deep reflection on the data and the material generated from multidisciplinary discussions and open consultation with the donation and transplantation community. Detection and management of brain-dead donors, with 4 specific subareas: access to intensive care units, new forms of hospital management, foreigners and ethnic minorities, and evaluation/maintenance of thoracic organ donors. Expanded criteria donors, with 3 subareas: aging, donors with positive tests to certain viral serologies, and donors with rare diseases. Special surgical techniques. Donation after cardiac death.

  10. Light-quark masses from unquenched lattice QCD

    SciTech Connect

    Ishikawa, T.; Aoki, S.; Fukugita, M.; Hashimoto, S.; Kaneko, T.; Yamada, N.; Ishikawa, K-I.; Okawa, M.; Ishizuka, N.; Kuramashi, Y.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.; Iwasaki, Y.; Kanaya, K.; Tsutsui, N.

    2008-07-01

    We calculate the light meson spectrum and the light quark masses by lattice QCD simulation, treating all light quarks dynamically and employing the Iwasaki gluon action and the nonperturbatively O(a)-improved Wilson quark action. The calculations are made at the squared lattice spacings at an equal distance a{sup 2}{approx_equal}0.005, 0.01, and 0.015 fm{sup 2}, and the continuum limit is taken assuming an O(a{sup 2}) discretization error. The light meson spectrum is consistent with experiment. The up, down, and strange quark masses in the MS scheme at 2 GeV are m=(m{sub u}+m{sub d})/2=3.55{sub -0.28}{sup +0.65} MeV and m{sub s}=90.1{sub -6.1}{sup +17.2} MeV where the error includes statistical and all systematic errors added in quadrature. These values contain the previous estimates obtained with the dynamical u and d quarks within the error.

  11. Spin 3/2 pentaquarks in anisotropic lattice QCD

    SciTech Connect

    Ishii, N.; Oka, M.; Doi, T.; Nemoto, Y.; Suganuma, H.

    2005-10-01

    High-precision mass measurements of a pentaquark (5Q) {theta}{sup +} in the J{sup P}=3/2{sup {+-}} channels are performed in anisotropic quenched lattice QCD. A large number of gauge configurations (N{sub conf}=1000) are prepared for the standard Wilson gauge action at {beta}=5.75 and the O(a) improved Wilson (clover) quark action is employed for {kappa}=0.1210(0.0010)0.1240 on a 12{sup 3}x96 lattice with the renormalized anisotropy as a{sub s}/a{sub t}=4. The Rarita-Schwinger formalism is adopted for interpolating fields. We examine several interpolating fields with isospin I=0, such as (a) the NK*-type, (b) the color-twisted NK*-type, and (c) the diquark-type operators. After chiral extrapolation, we obtain massive states, m{sub 5Q}{approx_equal}2.1-2.2 GeV in J{sup P}=3/2{sup -}, and m{sub 5Q}=2.4-2.6 GeV in J{sup P}=3/2{sup +}. Analyses using the hybrid boundary condition method are performed to determine whether these states are compact 5Q resonances or two-hadron scattering states. No compact 5Q resonance state is found below 2.1 GeV.

  12. Formal Developments for Lattice QCD with Applications to Hadronic Systems

    NASA Astrophysics Data System (ADS)

    Davoudi, Zohreh

    choice of operators, smeared over several lattice sites and deduced from a continuum angular momentum, has a smooth continuum limit. The scaling of the lower dimensional operators is proven to be no worse than a2, explaining the success of recent numerical studies of excited state spectroscopy of hadrons with similar choices of operators. These results are presented in chapter 2 of this thesis. Due to Euclidean nature of lattice correlation function, the physical scattering parameters must be obtained via an analytical continuation to Minkowski spacetime. However, this continuation is practically impossible in the infinite-volume limit of lattice correlation function except at the kinematic thresholds. A formalism due to Lüscher overcomes this issue by making the connection between the finite-volume spectrum of two interacting particles and their infinite-volume scattering phase shifts. We have extended the Lüscher methodology, using an effective field theory approach, to the two-nucleon systems with arbitrary spin, parity and total momentum (in the limit of exact isospin symmetry) and have studied its application to the deuteron system, the lightest bound states of the nucleons, by careful analysis of the finite-volume symmetries. A proposal is presented that enables future precision lattice QCD extraction of the small D/S ratio of the deuteron that is known to be due to the action of non-central forces. By investigating another scenario, we show how significant volume improvement can be achieved in the masses of nucleons and in the binding energy of the deuteron with certain choices of boundary conditions in a lattice QCD calculation of these quantities. These results are discussed in chapters 3, 4 and 5. In order to account for electromagnetic effects in hadronic systems, lattice QCD calculations have started to include quantum electrodynamic (QED). These effects are particularly interesting in studies of mass splittings between charged and neutral members of

  13. A transportable optical lattice clock

    NASA Astrophysics Data System (ADS)

    Vogt, Stefan; Häfner, Sebastian; Grotti, Jacopo; Koller, Silvio; Al-Masoudi, Ali; Sterr, Uwe; Lisdat, Christian

    2016-06-01

    We present the experimental setup and first results of PTB's transportable 87Sr clock. It consists of a physics package, several compact laser breadboards, and a transportable high finesse cavity for the clock laser. A comparison of the transportable system with our stationary optical lattice clock yields an instability of 2.2 x 10-15 √s/τ for the transportable clock. The current fractional uncertainty of 1 × 10-15 is still limited by the not yet fully evaluated light shift from the free running optical lattice laser operated near the magic wavelength. We are currently improving our transportable system to reach an uncertainty at or below the 10-17 level, which will finaly be limited by the uncertainty in blackbody radiation shift correction.

  14. Quasicrystallography from Bn lattices

    NASA Astrophysics Data System (ADS)

    Koca, M.; Koca, N. O.; Al-Mukhaini, A.; Al-Qanabi, A.

    2014-11-01

    We present a group theoretical analysis of the hypercubic lattice described by the affine Coxeter-Weyl group Wa (Bn). An h-fold symmetric quasicrystal structure follows from the hyperqubic lattice whose point group is described by the Coxeter-Weyl group W (Bn) with the Coxeter number h=2n. Higher dimensional cubic lattices are explicitly constructed for n = 4,5,6 by identifying their rank-3 Coxeter subgroups and maximal dihedral subgroups. Decomposition of their Voronoi cells under the respective rank-3 subgroups W (A3), W (H2)×W (A1) and W (H3)lead to the rhombic dodecahedron, rhombic icosahedron and rhombic triacontahedron respectively. Projection of the lattice B4 describes a quasicrystal structure with 8-fold symmetry. The B5 lattice leads to quasicrystals with both 5fold and 10 fold symmetries. The lattice B6 projects on a 12-fold symmetric quasicrystal as well as a 3D icosahedral quasicrystal depending on the choice of subspace of projections. The projected sets of lattice points are compatible with the available experimental data.

  15. Superalloy Lattice Block Structures

    NASA Technical Reports Server (NTRS)

    Whittenberger, J. D.; Nathal, M. V.; Hebsur, M. G.; Kraus, D. L.

    2003-01-01

    In their simplest form, lattice block panels are produced by direct casting and result in lightweight, fully triangulated truss-like configurations which provide strength and stiffness [2]. The earliest realizations of lattice block were made from A1 and steels, primarily under funding from the US Navy [3]. This work also showed that the mechanical efficiency (eg., specific stiffness) of lattice block structures approached that of honeycomb structures [2]. The lattice architectures are also less anisotropic, and the investment casting route should provide a large advantage in cost and temperature capability over honeycombs which are limited to alloys that can be processed into foils. Based on this early work, a program was initiated to determine the feasibility of extending the high temperature superalloy lattice block [3]. The objective of this effort was to provide an alternative to intermetallics and composites in achieving a lightweight high temperature structure without sacrificing the damage tolerance and moderate cost inherent in superalloys. To establish the feasibility of the superalloy lattice block concept, work was performed in conjunction with JAMCORP, Inc. Billerica, MA, to produce a number of lattice block panels from both IN71 8 and Mar-M247.

  16. A realistic lattice example

    SciTech Connect

    Courant, E.D.; Garren, A.A.

    1985-10-01

    A realistic, distributed interaction region (IR) lattice has been designed that includes new components discussed in the June 1985 lattice workshop. Unlike the test lattices, the lattice presented here includes utility straights and the mechanism for crossing the beams in the experimental straights. Moreover, both the phase trombones and the dispersion suppressors contain the same bending as the normal cells. Vertically separated beams and 6 Tesla, 1-in-1 magnets are assumed. Since the cells are 200 meters long, and have 60 degree phase advance, this lattice has been named RLD1, in analogy with the corresponding test lattice, TLD1. The quadrupole gradient is 136 tesla/meter in the cells, and has similar values in other quadrupoles except in those in the IR`s, where the maximum gradient is 245 tesla/meter. RLD1 has distributed IR`s; however, clustered realistic lattices can easily be assembled from the same components, as was recently done in a version that utilizes the same type of experimental and utility straights as those of RLD1.

  17. Hadron structure from lattice QCD

    SciTech Connect

    Green, Jeremy

    2016-01-22

    Recent progress in lattice QCD calculations of nucleon structure will be presented. Calculations of nucleon matrix elements and form factors have long been difficult to reconcile with experiment, but with advances in both methodology and computing resources, this situation is improving. Some calculations have produced agreement with experiment for key observables such as the axial charge and electromagnetic form factors, and the improved understanding of systematic errors will help to increase confidence in predictions of unmeasured quantities. The long-omitted disconnected contributions are now seeing considerable attention and some recent calculations of them will be discussed.

  18. Jammed lattice sphere packings

    NASA Astrophysics Data System (ADS)

    Kallus, Yoav; Marcotte, Étienne; Torquato, Salvatore

    2013-12-01

    We generate and study an ensemble of isostatic jammed hard-sphere lattices. These lattices are obtained by compression of a periodic system with an adaptive unit cell containing a single sphere until the point of mechanical stability. We present detailed numerical data about the densities, pair correlations, force distributions, and structure factors of such lattices. We show that this model retains many of the crucial structural features of the classical hard-sphere model and propose it as a model for the jamming and glass transitions that enables exploration of much higher dimensions than are usually accessible.

  19. Lattice-Induced Frequency Shifts in Sr Optical Lattice Clocks at the 10{sup -17} Level

    SciTech Connect

    Westergaard, P. G.; Lodewyck, J.; Lecallier, A.; Millo, J.; Lemonde, P.; Lorini, L.; Burt, E. A.; Zawada, M.

    2011-05-27

    We present a comprehensive study of the frequency shifts associated with the lattice potential in a Sr lattice clock by comparing two such clocks with a frequency stability reaching 5x10{sup -17} after a 1 h integration time. We put the first experimental upper bound on the multipolar M1 and E2 interactions, significantly smaller than the recently predicted theoretical upper limit, and give a 30-fold improved upper limit on the effect of hyperpolarizability. Finally, we report on the first observation of the vector and tensor shifts in a Sr lattice clock. Combining these measurements, we show that all known lattice related perturbations will not affect the clock accuracy down to the 10{sup -17} level, even for lattices as deep as 150 recoil energies.

  20. Nucleon Structure from Dynamical Lattice QCD

    SciTech Connect

    Huey-Wen Lin

    2007-06-01

    We present lattice QCD numerical calculations of hadronic structure functions and form factors from full-QCD lattices, with a chirally symmetric fermion action, domain-wall fermions, for the sea and valence quarks. The lattice spacing is about 0.12 fm with physical volume approximately (2 fm)3 for RBC 2-flavor ensembles and (3 fm)3 for RBC/UKQCD 2+1-flavor dynamical ones. The lightest sea quark mass is about 1/2 the strange quark mass for the former ensembles and 1/4 for the latter ones. Our calculations include: isovector vector- and axial-charge form factors and the first few moments of the polarized and unpolarized structure functions of the nucleon. Nonperturbative renormalization in RI/MOM scheme is applied.

  1. Nucleon Structure from Dynamical Lattice QCD

    SciTech Connect

    Lin, H.-W.

    2007-06-13

    We present lattice QCD numerical calculations of hadronic structure functions and form factors from full-QCD lattices, with a chirally symmetric fermion action, domain-wall fermions, for the sea and valence quarks. The lattice spacing is about 0.12 fm with physical volume approximately (2 fm)3 for RBC 2-flavor ensembles and (3 fm)3 for RBC/UKQCD 2+1-flavor dynamical ones. The lightest sea quark mass is about 1/2 the strange quark mass for the former ensembles and 1/4 for the latter ones. Our calculations include: isovector vector- and axial-charge form factors and the first few moments of the polarized and unpolarized structure functions of the nucleon. Nonperturbative renormalization in RI/MOM scheme is applied.

  2. Proton spin structure from lattice QCD

    SciTech Connect

    Fukugita, M.; Kuramashi, Y.; Okawa, M.; Ukawa, A. ||

    1995-09-11

    A lattice QCD calculation of the proton matrix element of the flavor singlet axial-vector current is reported. Both the connected and disconnected contributions are calculated, for the latter employing the variant method of wall source without gauge fixing. From simulations in quenched QCD with the Wilson quark action on a 16{sup 3}{times}20 lattice at {beta}=5.7 (the lattice spacing {ital a}{approx}0.14 fm), we find {Delta}{Sigma}={Delta}{ital u}+{Delta}{ital d}+{Delta}{ital s}=+0.638(54){minus}0.347(46){minus}0.109(30)=+0.18(10) with the disconnected contribution to {Delta}{ital u} and {Delta}{ital d} equal to {minus}0.119(44), which is reasonably consistent with the experiment.

  3. SPIN ON THE LATTICE.

    SciTech Connect

    ORGINOS,K.

    2003-01-07

    I review the current status of hadronic structure computations on the lattice. I describe the basic lattice techniques and difficulties and present some of the latest lattice results; in particular recent results of the RBC group using domain wall fermions are also discussed. In conclusion, lattice computations can play an important role in understanding the hadronic structure and the fundamental properties of Quantum Chromodynamics (QCD). Although some difficulties still exist, several significant steps have been made. Advances in computer technology are expected to play a significant role in pushing these computations closer to the chiral limit and in including dynamical fermions. RBC has already begun preliminary dynamical domain wall fermion computations [49] which we expect to be pushed forward with the arrival of QCD0C. In the near future, we also expect to complete the non-perturbative renormalization of the relevant derivative operators in quenched QCD.

  4. Root lattices and quasicrystals

    NASA Astrophysics Data System (ADS)

    Baake, M.; Joseph, D.; Kramer, P.; Schlottmann, M.

    1990-10-01

    It is shown that root lattices and their reciprocals might serve as the right pool for the construction of quasicrystalline structure models. All noncrystallographic symmetries observed so far are covered in minimal embedding with maximal symmetry.

  5. Root lattices and quasicrystals

    NASA Astrophysics Data System (ADS)

    Baake, M.; Joseph, D.; Kramer, P.; Schlottmann, M.

    1990-10-01

    It is shown how root lattices and their reciprocals might serve as the right pool for the construction of quasicrystalline structure models. All non-periodic symmetries observed so far are covered in minimal embedding with maximal symmetry.

  6. Superalloy Lattice Block Structures

    NASA Technical Reports Server (NTRS)

    Nathal, M. V.; Whittenberger, J. D.; Hebsur, M. G.; Kantzos, P. T.; Krause, D. L.

    2004-01-01

    Initial investigations of investment cast superalloy lattice block suggest that this technology will yield a low cost approach to utilize the high temperature strength and environmental resistance of superalloys in lightweight, damage tolerant structural configurations. Work to date has demonstrated that relatively large superalloy lattice block panels can be successfully investment cast from both IN-718 and Mar-M247. These castings exhibited mechanical properties consistent with the strength of the same superalloys measured from more conventional castings. The lattice block structure also accommodates significant deformation without failure, and is defect tolerant in fatigue. The potential of lattice block structures opens new opportunities for the use of superalloys in future generations of aircraft applications that demand strength and environmental resistance at elevated temperatures along with low weight.

  7. Asymptotic energy of lattices

    NASA Astrophysics Data System (ADS)

    Yan, Weigen; Zhang, Zuhe

    2009-04-01

    The energy of a simple graph G arising in chemical physics, denoted by E(G), is defined as the sum of the absolute values of eigenvalues of G. As the dimer problem and spanning trees problem in statistical physics, in this paper we propose the energy per vertex problem for lattice systems. In general for a type of lattice in statistical physics, to compute the entropy constant with toroidal, cylindrical, Mobius-band, Klein-bottle, and free boundary conditions are different tasks with different hardness and may have different solutions. We show that the energy per vertex of plane lattices is independent of the toroidal, cylindrical, Mobius-band, Klein-bottle, and free boundary conditions. In particular, the asymptotic formulae of energies of the triangular, 33.42, and hexagonal lattices with toroidal, cylindrical, Mobius-band, Klein-bottle, and free boundary conditions are obtained explicitly.

  8. Automated Lattice Perturbation Theory

    SciTech Connect

    Monahan, Christopher

    2014-11-01

    I review recent developments in automated lattice perturbation theory. Starting with an overview of lattice perturbation theory, I focus on the three automation packages currently "on the market": HiPPy/HPsrc, Pastor and PhySyCAl. I highlight some recent applications of these methods, particularly in B physics. In the final section I briefly discuss the related, but distinct, approach of numerical stochastic perturbation theory.

  9. Improvement of oral bioavailability of flurbiprofen from flurbiprofen/beta-cyclodextrin inclusion complex by action of cinnarizine.

    PubMed

    Tokumura, Tadakazu; Muraoka, Atsushi; Machida, Yoshiharu

    2009-09-01

    Improvement of the oral bioavailability of flurbiprofen (Flu) after oral administration of flurbiprofen/beta-cyclodextrin inclusion complex (Flu/beta-CD) by the action of cinnarizine (CN) was investigated. Flu and Flu/beta-CD were administered orally to fasted rats at a dose of 20mg/kg as Flu. Thirty minutes after drug administration, CN dissolved in pH 4.0 buffer solution or pH 4.0 buffer solution alone was administered to the rats. The dose of CN was 0.17 mg/kg. Blood samples were taken from rats and Flu concentrations in plasma samples were determined by HPLC. It was found from the comparison of Flu and Flu with CN (Flu+CN) that CN had no effect on plasma concentrations of Flu after oral administration of Flu. The mean plasma levels after oral administration of Flu/beta-CD with CN (Flu/beta-CD+CN) were larger not only than those of Flu and Flu+CN but also than those of Flu/beta-CD. The value of C(max) in Flu/beta-CD+CN was significantly larger than that of Flu/beta-CD. This is considered to be caused by the action of CN as a competing agent. This mechanism was supported by the result of solubility study in which Flu solubility in beta-CD solution decreased with the addition of CN. It was found from these results that CN had strong ability as a competing agent in vivo.

  10. Legless locomotion in lattices

    NASA Astrophysics Data System (ADS)

    Schiebel, Perrin; Dai, Jin; Gong, Chaohui; Serrano, Miguel M.; Mendelson, Joseph R., III; Choset, Howie; Goldman, Daniel I.

    2015-03-01

    By propagating waves from head to tail, limbless organisms like snakes can traverse terrain composed of rocks, foliage, soil and sand. Previous research elucidated how rigid obstacles influence snake locomotion by studying a model terrain-symmetric lattices of pegs placed in hard ground. We want to understand how different substrate-body interaction modes affect performance in desert-adapted snakes during transit of substrates composed of both rigid obstacles and granular media (GM). We tested Chionactis occipitalis, the Mojave shovel-nosed snake, in two laboratory treatments: lattices of 0 . 64 cm diameter obstacles arrayed on both a hard, slick substrate and in a GM of ~ 0 . 3 mm diameter glass particles. For all lattice spacings, d, speed through the hard ground lattices was less than that in GM lattices. However, maximal undulation efficiencies ηu (number of body lengths advanced per undulation cycle) in both treatments were comparable when d was intermediate. For other d, ηu was lower than this maximum in hard ground lattices, while on GM, ηu was insensitive to d. To systematically explore such locomotion, we tested a physical robot model of the snake; performance depended sensitively on base substrate, d and body wave parameters.

  11. Lattice QCD simulation with the overlap Dirac operator

    NASA Astrophysics Data System (ADS)

    Howard, Joseph

    A complete understanding of the predictions of Quantum Chromodynamics (QCD) will be an important part of moving particle physics beyond the current Standard Model. At the energy scales relevant to bound QCD systems, such as the pion and the proton, non-perturbative techniques must be used to estimate QCD predictions. The non-perturbative method used to investigate QCD is lattice QCD, or QCD on a discrete spacetime lattice. One aspect of continuum QCD that should be preserved in lattice QCD is chiral symmetry. The inability of maintaining such symmetry in the discretization of the Dirac equation has for years been a shortcoming of lattice QCD. Recently, however, Neuberger has introduced the overlap Dirac operator, which preserves exact chiral symmetry, even at finite lattice spacing. This dissertation describes a simulation of lattice QCD using the Wilson gauge action and the overlap Dirac operator, performed on two separate lattices. The first was an 183 x 64 lattice (where the first number represents the spatial extent and the second the extent in time) with coupling beta = 6.0 (lattice spacing a-1 ≃ 2.0 GeV), and the second a 143 x 48 lattice with coupling beta = 5.85 (lattice spacing a-1 ≃ 1.5 GeV). The finer 183 x 64 lattice size was chosen in order to allow a large enough extent in time for prediction of QCD observables that previous investigations using smaller lattices were unable to predict. The coarser 143 x 48 lattice was chosen to have roughly the same physical volume as the finer lattice, allowing for an investigation into scaling effects. The dissertation begins with a review of the basics of QCD and lattice QCD, including descriptions of the overlap Dirac operator and chiral symmetry on the lattice. Next, the results from the two simulations are presented. The chiral nature of the overlap Dirac operator is confirmed. The light hadron spectrum is presented, along with decay constants and other observables. An investigation is described on the use

  12. Solitons in spiraling Vogel lattices.

    PubMed

    Kartashov, Yaroslav V; Vysloukh, Victor A; Torner, Lluis

    2013-01-15

    We address light propagation in Vogel optical lattices and show that such lattices support a variety of stable soliton solutions in both self-focusing and self-defocusing media, whose propagation constants belong to domains resembling gaps in the spectrum of a truly periodic lattice. The azimuthally rich structure of Vogel lattices allows generation of spiraling soliton motion.

  13. Effects of flavor-symmetry violation from staggered fermion lattice simulations of graphene

    SciTech Connect

    Giedt, Joel; Nayak, Saroj; Skinner, Andrew

    2011-01-15

    We analyze the effects of flavor splitting from staggered fermion lattice simulations of a low-energy effective theory for graphene. Both the unimproved action and the tadpole-improved action with a Naik term show significant flavor-symmetry breaking in the spectrum of the Dirac operator. Note that this is true even in the vicinity of the second-order phase transition point where it has been argued that the flavor-symmetry breaking should be small due to the continuum limit being approached. We show that at weaker couplings the flavor splitting is drastically reduced by stout link smearing, while this mechanism is ineffective at the stronger couplings relevant to suspended graphene. We also measure the average plaquette and describe how it calls for a reinterpretation of previous lattice Monte Carlo simulation results, due to tadpole improvement. After taking into account these effects, we conclude that previous lattice simulations are possibly indicative of an insulating phase, although the effective number of light flavors could be effectively less than two due to the flavor-splitting effects. If that is true, then simulations with truly chiral fermions (such as overlap fermions) are needed in order to settle the question.

  14. Topics in lattice QCD and effective field theory

    NASA Astrophysics Data System (ADS)

    Buchoff, Michael I.

    Quantum Chromodynamics (QCD) is the fundamental theory that governs hadronic physics. However, due to its non-perturbative nature at low-energy/long distances, QCD calculations are difficult. The only method for performing these calculations is through lattice QCD. These computationally intensive calculations approximate continuum physics with a discretized lattice in order to extract hadronic phenomena from first principles. However, as in any approximation, there are multiple systematic errors between lattice QCD calculation and actual hardronic phenomena. Developing analytic formulae describing the systematic errors due to the discrete lattice spacings is the main focus of this work. To account for these systematic effects in terms of hadronic interactions, effective field theory proves to be useful. Effective field theory (EFT) provides a formalism for categorizing low-energy effects of a high-energy fundamental theory as long as there is a significant separation in scales. An example of this is in chiral perturbation theory (chiPT), where the low-energy effects of QCD are contained in a mesonic theory whose applicability is a result of a pion mass smaller than the chiral breaking scale. In a similar way, lattice chiPT accounts for the low-energy effects of lattice QCD, where a small lattice spacing acts the same way as the quark mass. In this work, the basics of this process are outlined, and multiple original calculations are presented: effective field theory for anisotropic lattices, I=2 pipi scattering for isotropic, anisotropic, and twisted mass lattices. Additionally, a combination of effective field theory and an isospin chemical potential on the lattice is proposed to extract several computationally difficult scattering parameters. Lastly, recently proposed local, chiral lattice actions are analyzed in the framework of effective field theory, which illuminates various challenges in simulating such actions.

  15. Criterium for the index theorem on the lattice

    NASA Astrophysics Data System (ADS)

    Bicudo, Pedro

    2003-04-01

    We study how far the Index Theorem can be extrapolated from the continuum to finite lattices with finite topological charge densities. To examine how the Wilson action approximates the Index theorem, we specialize in the lattice version of the Schwinger model. We propose a new criterion for solutions of the Ginsparg-Wilson Relation constructed with the Wilson action. We conclude that the Neuberger action is the simplest one that maximally complies with the Index Theorem, and that its best parameter in d = 2 is m0 = 1.1 ± 0.1.

  16. Criterium for the Index Theorem on the Lattice

    NASA Astrophysics Data System (ADS)

    Bicudo, Pedro

    2003-08-01

    We study how far the Index Theorem can be extrapolated from the continuum to finite lattices with finite topological charge densities. To examine how the Wilson action approximates the Index theorem, we specialize in the lattice version of the Schwinger model. We propose a new criterion for solutions of the Ginsparg-Wilson Relation constructed with the Wilson action. We conclude that the Neuberger action is the simplest one that maximally complies with the Index Theorem, and that its best parameter in d = 2 is m0 = 1.1 ± 0.1.

  17. Thin-walled reinforcement lattice structure for hollow CMC buckets

    DOEpatents

    de Diego, Peter

    2017-06-27

    A hollow ceramic matrix composite (CMC) turbine bucket with an internal reinforcement lattice structure has improved vibration properties and stiffness. The lattice structure is formed of thin-walled plies made of CMC. The wall structures are arranged and located according to high stress areas within the hollow bucket. After the melt infiltration process, the mandrels melt away, leaving the wall structure to become the internal lattice reinforcement structure of the bucket.

  18. Anomalies, gauge field topology, and the lattice

    SciTech Connect

    Creutz, Michael

    2011-04-15

    Motivated by the connection between gauge field topology and the axial anomaly in fermion currents, I suggest that the fourth power of the naive Dirac operator can provide a natural method to define a local lattice measure of topological charge. For smooth gauge fields this reduces to the usual topological density. For typical gauge field configurations in a numerical simulation, however, quantum fluctuations dominate, and the sum of this density over the system does not generally give an integer winding. On cooling with respect to the Wilson gauge action, instanton like structures do emerge. As cooling proceeds, these objects tend shrink and finally 'fall through the lattice.' Modifying the action can block the shrinking at the expense of a loss of reflection positivity. The cooling procedure is highly sensitive to the details of the initial steps, suggesting that quantum fluctuations induce a small but fundamental ambiguity in the definition of topological susceptibility.

  19. On lattice chiral gauge theories

    NASA Technical Reports Server (NTRS)

    Maiani, L.; Rossi, G. C.; Testa, M.

    1991-01-01

    The Smit-Swift-Aoki formulation of a lattice chiral gauge theory is presented. In this formulation the Wilson and other non invariant terms in the action are made gauge invariant by the coupling with a nonlinear auxilary scalar field, omega. It is shown that omega decouples from the physical states only if appropriate parameters are tuned so as to satisfy a set of BRST identities. In addition, explicit ghost fields are necessary to ensure decoupling. These theories can give rise to the correct continuum limit. Similar considerations apply to schemes with mirror fermions. Simpler cases with a global chiral symmetry are discussed and it is shown that the theory becomes free at decoupling. Recent numerical simulations agree with those considerations.

  20. Transforming a conservative clinical setting: ICU nurses' strategies to improve care for patients' relatives through a participatory action research.

    PubMed

    Zaforteza, Concha; Gastaldo, Denise; Moreno, Cristina; Bover, Andreu; Miró, Rosa; Miró, Margalida

    2015-12-01

    This study focuses on change strategies generated through a dialogical-reflexive-participatory process designed to improve the care of families of critically ill patients in an intensive care unit (ICU) using a participatory action research in a tertiary hospital in the Balearic Islands (Spain). Eleven professionals (representatives) participated in 11 discussion groups and five in-depth interviews. They represented the opinions of 49 colleagues (participants). Four main change strategies were created: (i) Institutionally supported practices were confronted to make a shift from professional-centered work to a more inclusive, patient-centered approach; (ii) traditional power relations were challenged to decrease the hierarchical power differences between physicians and nurses; (iii) consensus was built about the need to move from an individual to a collective position in relation to change; and (iv) consensus was built about the need to develop a critical attitude toward the conservative nature of the unit. The strategies proposed were both transgressive and conservative; however, when compared with the initial situation, they enhanced the care offered to patients' relatives and patient safety. Transforming conservative settings requires capacity to negotiate positions and potential outcomes. However, when individual critical capacities are articulated with a new approach to micropolitics, transformative proposals can be implemented and sustained. © 2015 John Wiley & Sons Ltd.