54,822 research outputs found
Binary Mixtures of Particles with Different Diffusivities Demix
The influence of size differences, shape, mass and persistent motion on phase
separation in binary mixtures has been intensively studied. Here we focus on
the exclusive role of diffusivity differences in binary mixtures of equal-sized
particles. We find an effective attraction between the less diffusive
particles, which are essentially caged in the surrounding species with the
higher diffusion constant. This effect leads to phase separation for systems
above a critical size: A single close-packed cluster made up of the less
diffusive species emerges. Experiments for testing of our predictions are
outlined.Comment: 5 figures in main text, 8 figures in Supplemental Materia
Laser Doppler spectrometer method of particle sizing
A spectrometer for the detection of airborne particulate pollution in the submicron size range is described. In this device, airborne particles are accelerated through a supersonic nozzle, with different sizes achieving different velocities in the gas flow. Information about the velocities of the accelerated particles is obtained with a laser-heterodyne optical system through the Doppler shift of light scattered from the particles. Detection is accomplished by means of a photomultiplier. Nozzle design and signal processing techniques are also discussed
Asymptotic distributions for a class of generalized -statistics
We adapt the techniques in Stigler [Ann. Statist. 1 (1973) 472--477] to
obtain a new, general asymptotic result for trimmed -statistics via the
generalized -statistic representation introduced by Serfling [Ann. Statist.
12 (1984) 76--86]. Unlike existing results, we do not require continuity of an
associated distribution at the truncation points. Our results are quite general
and are expressed in terms of the quantile function associated with the
distribution of the -statistic summands. This approach leads to improved
conditions for the asymptotic normality of these trimmed -statistics.Comment: Published in at http://dx.doi.org/10.3150/09-BEJ240 the Bernoulli
(http://isi.cbs.nl/bernoulli/) by the International Statistical
Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm
The Robber Flies (Diptera: Asilidae) of the Albany Pinebush
The Albany Pinebush, a pitch pine-scrub oak sand barrens, was examined for robber flies and the results compared to historical records found in the New York State Museum, Albany. Thirty-six species were recorded of which seventeen were new records. Two species, Cyrtopogon laphriformis and Promachus bastardii, last recorded in 1914 and 1931, respectively, were not located in the survey
Space Applications of Solid State Luminescent Phenomena
Luminescent phenomena in interplanetary space and moon related to luminescent, thermoluminescent, and cathodoluminescent properties of terrestrial minerals and rock
Properties of Magnetized Quark-Hybrid Stars
The structure of a magnetized quark-hybrid stars (QHS) is modeled using a
standard relativistic mean-field equation of state (EoS) for the description of
hadronic matter. For quark matter we consider a bag model EoS which is modified
perturbatively to account for the presence of a uniform magnetic field. The
mass-radius (M-R) relationship, gravitational redshift and rotational Kepler
periods of such stars are compared with those of standard neutron stars (NS).Comment: 5 pages, 2 figures, prepared for the 2nd International Symposium on
Strong Electromagnetic Fields and Neutron Stars (SMFNS2011), Varadero, Cuba,
5-7 May 201
Phonon Raman scattering of perovskite LaNiO3 thin films
We report an investigation of perovskite-type LaNiO3 thin films by Raman
scattering in both various scattering configurations and as a function of
temperature. The room-temperature Raman spectra and the associated phonon mode
assignment provide reference data for phonon calculations and for the use of
Raman scattering for structural investigations of LaNiO3, namely the effect of
strain in thin films or heterostructures. The temperature-dependent Raman
spectra from 80 to 900 K are characterized by the softening of the rotational
A1g mode, which suggest a decreasing rhombohedral distortion towards the ideal
cubic structure with increasing temperature
Cathodoluminescence of enstatite from chondritic and achondritic meteorites and its selenological implications Technical report, 1 Sep. 1967 - 1 Jul. 1968
Cathodoluminescence of enstatite from chondritic and achondritic meteorites and selenological implication
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