46,091 research outputs found
Measurements of Thermal Performance of the Regenerator of a Cryocooler with High NTU Value
No full textMiniature piezoelectric actuators: design thinking, fabrication, and performance evaluations
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An Improved Model for the Single-Blow Measurement Including the Non-Adiabatic Side Wall Effect
No full textEvaluation of Thermal Performance of Regenerators using an Improved Single-Blow Technique Including the Effects of Non-Adiabatic Side Wall and Axial Conduction
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On a Theorem of G. Benke and D.-C. Chang
Full text linkLet B denote the unit ball in Cⁿ, and ν the normalized Lebesgue measure on B. For α>-1, define dνα(z) = (1-|z|²)αdν(z), z∈B. Let H(B) denote the space of all holomorphic functions in B. G.Benke and D.-C. Chang [1] have recently characterized the weighted Bergman spaces Ap(νa)≡Lp(νa)∩H(B) as those functions in H(B) whose images under the action of a certain set of differential operators lie in Lp(νa). In the present paper we introduce some new operators and give another proof of their theorem
First-order system least squares for the Stokes and linear elasticity equations: Further results
No full textFirst-order system least squares (FOSLS) was developed in [SIAM J. Numer. Anal., 34 (1997), pp. 1727-1741; SIAM J. Numer. Anal., 35 (1998), pp. 320-335] for Stokes and elasticity equations. Several new results for these methods are obtained here. First, the inverse-norm FOSLS scheme that was introduced but not analyzed in [SIAM J. Numer. Anal., 34 ( 1997), pp. 1727-1741] is shown to be continuous and coercive in the L-2 norm. This result is shown to hold for pure displacement or pure traction boundary conditions in two or three dimensions, and for mixed boundary conditions in two dimensions. Next, the FOSLS schemes developed in [SIAM J. Numer. Anal., 35 (1998), pp. 320-335] are applied to the pure displacement problem in planar and spatial linear elasticity by eliminating the pressure variable in the FOSLS formulations of [SIAM J. Numer. Anal., 34 (1997), pp. 1727-1741]. The idea of two-dimensional variable rotation is then extended to three dimensions to make the intervariable coupling subdominant (uniformly so in the Poisson ratio for elasticity). This decoupling ensures optimal (uniform) performance of finite element discretization and multigrid solution methods. It also allows special treatment of the new trace variable, which corresponds to the divergence of velocity in the case of Stokes, so that conservation can be easily imposed, for example. Numerical results for various boundary value problems of planar linear elasticity are studied in a companion paper [SIAM J. Sci. Comput., 21 (2000), pp. 1706-1727].Z Cai: This author was sponsored by the National Science Foundation under grant DMS-9619792;
C.-O. Lee: This author was sponsored by BSRI-97-1436 and KOSEF 97-0701-01-01-3.
T. A. Manteuffel and S. F. McCormick: These
authors were sponsored by the National Science Foundation under grant DMS-9706866 and the Department of Energy under grant DE-FG03-93ER2516
Electromechanical behavior of botanical epidermal cell microstructures with electrostatic actuation
No full textB -> eta K-c(eta ' K-c) decays in QCD factorization
No full textWe study the exclusive decays of the B meson into pseudoscalar charmonium states eta(c) and eta(c)' within the QCD factorization approach and find that the non-factorizable corrections to naive factorization are infrared safe at leading-twist order. The spectator interactions arising from the kaon twist-3 effects are formally power suppressed but chirally and logarithmically enhanced. An important improvement by including the O(alpha(s)) corrections is the cancellation of the renormalization scale mu dependence of the decay amplitude. However, the calculated decay rates are too small to accommodate the experimental data. On the other hand, we compare the theoretical calculations for B meson decays to J/psi, psi', eta(c) and eta'(c), and find that the predicted relative decay rates of these four states are approximately compatible with the experimental data.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000223097800007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, Particles & FieldsSCI(E)17ARTICLE3365-3703
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