79,745 research outputs found
SUSY Before the Next Lepton Collider
After a brief review of the Minimal Supersymmetric Standard Model (MSSM) and
specifically the Minimal Supergravity Model (SUGRA), the prospects for
discovering and studying SUSY at the CERN Large Hadron Collider are reviewed.
The possible role for a future Lepton Collider --- whether or
--- is also discussed.Comment: LaTeX with included aipproc.sty, 17 pages, 12 figures. To appear in
Workshop on Physics at the First Muon Collide
Response of a nozzle to an entropy disturbance example of thermodynamically unsteady aerodynamics
The larger number of problems that qualify as unsteady aerodynamics
relate to non-uniform motion of surfaces -- such as pitching of
airfoils -- or the correspondingly non-uniform motion of a fluid about a
surface -- such as a gust passing over an airfoil. Experiment and analysis
concerning these problems aims to determine the non-steady forces
or surface stresses on the object. These may be thought of as "kinematically" non-steady problems. Another class of problems presents itself
when the undisturbed gas stream temperature (or density) is non-steady
although the velocity and pressure are steady; such non-uniformities are
associated with entropy variations from point to point of the stream. In a
locally adiabatic flow these entropy variations are transported with the
stream, and when a fixed boundary -- such as an airfoil -- is encountered,
the flow field undergoes a non-steady change because the density variations
alter the pressure field -- or the stresses at the boundaries. This happens
in spite of the fact that the undisturbed free -stream velocity field and the
surface boundaries of the flow are independent of time. A gas turbine blade, for example, will experience a time-dependent load simply because
of temperature fluctuations in the combustion products flowing over it, although
the angle of attack is independent of time. We shall call these
"thermodynamically" unsteady flows in contrast with the more familiar
kinematically unsteady flows
First Record of \u3ci\u3eTachysphex Pechumani\u3c/i\u3e (Hymenoptera: Sphecidae) From Indiana
A nesting population of Tachysphex pechumani is recorded from near Indiana Dunes National Lakeshore, Porter County, Indiana. This record is a western extension of the known range of this uncommon species. Nesting biology of T. pechumani at this locality was similar to previously published observations on this species
Some Gasdynamic Problems in the Flow of Condensing Vapors
Some Gasdynamic Problems in the Flow of Condensing Vapors. The general problem of the flow
of a wet vapor, with or without an inert diluent is formulated under the assumption that the liquid phase
is finely divided and dispersed throughout the gaseous component in droplets whose radii are nearly
constant in any local region. The processes of momentum transfer, heat transfer between phases are
assumed to take place according to Stokes law and Nusselt number of unity, respectively. The mass transfer
process is treated as diffusion governed in the presence of an inert diluent and kinetic governed for two
phases of a pure substance.
The physical understanding of such problems, in contrast with those of conventional gas dynamics,
rests largely in the role played by the relaxation times or equilibration lengths associated with these three
processes. Consequently, both simple and coupled relaxation processes are examined rather carefully by
specific examples. Subsequently, the problem of near-equilibrium flow in a nozzle with phase change is solved
under the small-slip approximation. The structure of the normal shock in a pure substance is investigated
and reveals three rather distinct zones: the gasdynamic shock, the vapor relaxation zone, and the thermal
and velocity equilibration zone. The three-dimensional steady flow of the two-phase condensing continuum
is formulated according to first order perturbation theory, and the structure of waves in such supersonic flow
is examined. Finally, the attenuation of sound in fogs is formulated and solved accounting for the important
effects of phase change as well as the viscous damping and heat transfer which have been included in previous
analyses
Observations on the Nesting Behavior of \u3ci\u3eAuplopus Caerulescens Subcorticalis\u3c/i\u3e and Other Auplopodini (Hymenoptera: Pompilidae)
Nest searching and mud and prey transport behavior in a small aggregation of Auplopus caerulescens subcorticalis nesting in a concrete cellar foundation in upstate New York are delineated. The contents of nine cells of this subspecies are identified, the mud cells and wasps\u27 eggs are described and measured and the site of the egg attachment on the spider is defined. Selectivity in prey capture at the family level by certain females was indicated, with Thomisidae reported as a new prey family. The method of prey transport and a new prey family (Clubionidae) for Auplopus mellipes variitarsatus are given. Two prey records for Ageniella fulgifrons are included
Reply to comments by S. L. Soo
If one takes due regard for the condition under which my collision model is valid, explicitly stated by Eq. (15), Ref. 1, the difficulties experienced by Soo(2) will not arise
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