4,352 research outputs found
Deformation of an elastic cell in a uniform stream and in a circulatory flow
The deformation of a circular, inextensible elastic cell is examined when the cell is placed into two different background potential flows: a uniform stream and a circulatory flow induced by a point vortex located inside the cell. In a circulatory flow a cell may deform into a mode m shape with m-fold rotational symmetry. In a uniform stream, shapes with two-fold rotational symmetry tend to be selected. In a weak stream a cell deforms linearly into an ellipse with either its major or its minor axis aligned with the oncoming flow. This marks an interesting difference with a bubble with constant surface tension in a uniform stream, which can only deform into a mode 2 shape with its major axis perpendicular to the stream (Vanden-Broeck & Keller, 1980b). In general, as the strength of the uniform stream is increased from zero, solutions emerge continuously from the cell configurations in quiescent fluid found by Flaherty et al. (1972). A richly populated solution space is described with multiple solution branches which either terminate when a cell reaches a state with a point of self-contact or loop round to continuously connect cell states which exist under identical conditions in the absence of flow
Exercises to enlarge the meaningful vocabulary of children in grade five.
Thesis (M.A.)--Boston Universit
Baryon and antibaryon production in hadron-hadron and hadron-nucleus interactions
Cascade baryon and anti-baryon yields have been measured in p+p and p+A
collisions. After extraction of the projectile component in p+A interactions
close similarities with A+A collisions concerning the nuclear enhancement
factors are observed. In addition the importance of effects related to
projectile isospin and to net baryon stopping is pointed out.Comment: 4 pages, 5 figures, Presented at Quark Matter 2002, Nantes, Franc
Resonance Production in STAR
The recent results from resonance production in central Au+Au and p+p
collisions at 200 GeV from the STAR experiment at RHIC
are presented and discussed.Comment: 7 pages, proceedings 19th Winter Workshop on Nuclear Dynamics,
Breckenridge, Colorado, USA, February 8-15, 200
Solitary waves on a ferrofluid jet
The propagation of axisymmetric solitary waves on the surface of an otherwise cylindrical ferrofluid jet subjected to a magnetic field is investigated. An azimuthal magnetic field is generated by an electric current flowing along a stationary metal rod which is mounted along the axis of the moving jet. A numerical method is used to compute fully-nonlinear travelling solitary waves and predictions of elevation waves and depression waves by Rannacher & Engel (2006) using a weakly-nonlinear theory are confirmed in the appropriate ranges of the magnetic Bond number. New nonlinear branches of solitary wave solutions are identified. As the Bond number is varied, the solitary wave profiles may approach a limiting configuration with a trapped toroidal-shaped bubble, or they may approach a static wave (i.e. one with zero phase speed). For a sufficiently large axial rod, the limiting profile may exhibit a cusp
Phase-field approach to heterogeneous nucleation
We consider the problem of heterogeneous nucleation and growth. The system is
described by a phase field model in which the temperature is included through
thermal noise. We show that this phase field approach is suitable to describe
homogeneous as well as heterogeneous nucleation starting from several general
hypotheses. Thus we can investigate the influence of grain boundaries,
localized impurities, or any general kind of imperfections in a systematic way.
We also put forward the applicability of our model to study other physical
situations such as island formation, amorphous crystallization, or
recrystallization.Comment: 8 pages including 7 figures. Accepted for publication in Physical
Review
How well does NLO pQCD describe strangeness in collisions at = 200 GeV in STAR?
We present measurements of the transverse momentum spectra for
, , and their antiparticles in p+p
collisions at . The extracted mid-rapidity yields and
are in agreement with previous experiments while
they have smaller statistical errors. We compare the measured spectra for
and to the latest available calculations from
NLO pQCD and see good agreement for the above 1.5 GeV/c.Comment: conference proceedings, Strangeness in Quark Matter 2004, 5 pages,
submitted to Journal Physics G, final version submitted to journal incl.
modifications requested by edito
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