2,203 research outputs found
Transport: Introduction
Space transportation requirements for the NASA baseline scenario for future space missions are discussed. Spacecraft/propulsion technologies required for surface-to-orbit, orbit-to-orbit, and surface (lunar) transportation are addressed
Half-space theorems for minimal surfaces in Nil_3 and Sol_3
We prove some half-space theorems for minimal surfaces in the Heisenberg
group Nil_3 and the Lie group Sol_3 endowed with their left-invariant
Riemannian metrics. If S is a properly immersed minimal surface in Nil_3 that
lies on one side of some entire minimal graph G, then S is the image of G by a
vertical translation. If S is a properly immersed minimal surface in Sol_3 that
lies on one side of a special plane, then S is another special plane.Comment: 19 pages, 3 figure
The topology, geometry and conformal structure of properly embedded minimal surfaces
This paper develops new tools for understanding surfaces with more than one
end (and usually, of infinite topology) which properly minimally embed into
Euclidean three-space. On such a surface, the set of ends forms a compact
Hausdorff space, naturally ordered by the relative heights of the ends in
space. One of our main results is that the middle ends of the surface have
quadratic area growth, and are thus not limit ends. This implies, for instance,
that the surface can have at most two limit ends (at the top and bottom of the
ordering), which is a strong topological restriction. There are also
restrictions on the asymptotic geometry and conformal structure of such a
surface: for example, we prove that if the surface has exactly two limit ends
(as do the classical Riemann Staircase examples), then it is recurrent (that
is, almost all Brownian paths are dense in the surface, and in particular any
positive harmonic function on the surface is constant). These results have
played an important role in the proof of several recent advances in the theory,
including the uniqueness of the helicoid, the invariance of flux for a
coordinate function on a properly immersed minimal surface, and the topological
classification of properly embedded minimal surfaces
Understanding Strikes in Revolutionary Russia
Also CSST Working Paper #37.http://deepblue.lib.umich.edu/bitstream/2027.42/51175/1/408.pd
The Institutionalization of Conflict in the Reform of Schools: A Case Study of Court Implementation of the PARC Decree
Symposium: The Sociology of Class Actions
NOTE: A printing error labeled this issue Spring 1982, when it should have been labeled Summer 198
The Institutionalization of Conflict in the Reform of Schools: A Case Study of Court Implementation of the PARC Decree
Symposium: The Sociology of Class Actions
NOTE: A printing error labeled this issue Spring 1982, when it should have been labeled Summer 198
Tunable UV Filters
This report describes an investigation intended to determine the practical short wavelength limit for Fabry-Perot etalons operating in the far ultraviolet. This portion of the investigation includes a design study of multilayer dielectric reflector coatings that would be required by such an etalon. Results of the study indicate that etalons may be made to operate at wavelengths as short as 121 nm
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