On the basis of a new convergence study of high-resolution N-body simulations, my colleagues and I now agree that the Navarro, Frenk, & White (1996) density profile ρNFW (r) ∝ r (r + rs) −2 is a good representation of typical dark matter halos of galactic mass. Comparing simulations of the same halo with numbers of particles ranging from ∼ 10 to ∼ 10, we have also shown that rs, the radius wher...

Observations of the interstellar medium (ISM) show a complex density and velocity structure, which is in part attributed to turbulence. Consequently, multifractal formalism should be applied observation maps ISM order characterize its turbulent multiplicative cascade properties. However, formalism, even more advanced recent canonical versions, requires large number realizations system, usually ...

abstract   background: postural instability has been identified as a potential precursor of falls in elderly subjects. postural stability in quiet stance is commonly assessed with center of pressure (cop) measures. the purpose of this study was to determine testretest reliability and minimal detectable change (mdc) for the center of pressure (cop) measures in the elderly subjects.   methods: ei...

The Authors have found a clever solution to the discontinuity of the velocity gradient at the axis of uniform turbulent pipe flow in the log-wake model by means of a modification with a cubic correction function. Their modified log-wake law leads to a very good replication of the velocity profiles of a large series of smooth pipe flow experiments (see Fig. 5). Moreover, it leads to a correct ed...

We construct traveling wave solutions with vortex helices for the Schrödinger map equation ∂m ∂t = m× (∆m−m3~e3) in R × R, of the form m(s1, s2, s3 − δ| log | t) with traveling velocity δ| log | along the direction of s3 axis. We use a perturbation approach which gives a complete characterization of the asymptotic behavior of the solutions.

[1] Eleven cloud cases through marine stratus, obtained during two field experiments in the North Atlantic Ocean, are used to study the sensitivity of cloud droplet nucleation to the vertical gust velocity. Selected cloud microphysical data, size-distributed aerosol properties and particle chemistry are applied in an adiabatic parcel model. The nucleated cloud droplet number concentrations (N) ...

Employing data on the assessed value of land in 1974–2007 Japan, we exhibit a quasistatically varying log-normal distribution in the middle scale region. In the derivation, a Non-Gibrat’s law under the detailed quasi-balance is adopted together with two approximations. The resultant distribution is power-law with the varying exponent in the large scale region and the quasistatic log-normal dist...

We present numerical and analytical results for a stochastic representation of immiscible flow in a heterogeneous reservoir. Using a perturbation method, we derive equations of statistical moments to second order in the standard deviation of log permeability. We allow these moments to depend on location, hence the common assumption of statistical homogeneity (stationarity) does not apply. This ...

We measured perceived velocity as a function of contrast for luminance and isoluminant sinusoidal gratings, luminance and isoluminant plaids, and second-order, amplitude-modulated, drift-balanced stimuli. For all types of stimuli perceived velocity was contrast-invariant for fast moving patterns at or above 4 deg/sec. For slowly moving stimuli the log of perceived velocity was a linear function...

A method for the simultaneous measurement of velocity and passive scalar concentration fields by means of particle image velocimetry (PIV) and planar laser induced florescence (PLIF) techniques is described here. An application of the combined PIV-PLIF system is demonstrated by performing simultaneous velocity and concentration measurements in the near field of a turbulent jet mixing flow. The ...