The 10-ft. space simulator at the Jet Propulsion Laboratory

Pumping, vacuum, cryogenic, solar simulation, and supporting systems for space simulator facilit

Reference System Description

Several candidate antenna configurations are evaluated in terms of weight, efficiency, and structural rigidity. Particular emphasis is given to the waveguide slot array and its application to solar power satellites SPS. The electronic aspects of an SPS specific waveguide slot array are defined

Scattering of first and second sound waves by quantum vorticity in superfluid Helium

We study the scattering of first and second sound waves by quantum vorticity in superfluid Helium using two-fluid hydrodynamics. The vorticity of the superfluid component and the sound interact because of the nonlinear character of these equations. Explicit expressions for the scattered pressure and temperature are worked out in a first Born approximation, and care is exercised in delimiting the range of validity of the assumptions needed for this approximation to hold. An incident second sound wave will partly convert into first sound, and an incident first sound wave will partly convert into second sound. General considerations show that most incident first sound converts into second sound, but not the other way around. These considerations are validated using a vortex dipole as an explicitely worked out example.Comment: 24 pages, Latex, to appear in Journal of Low Temperature Physic

Star-Like Micelles with Star-Like Interactions: A quantitative Evaluation of Structure Factor and Phase Diagram

PEP-PEO block copolymer micelles offer the possibility to investigate phase behaviour and interactions of star polymers (ultra-soft colloids). A star-like architecture is achieved by an extremely asymmetric block ratio (1:20). Micellar functionality f can be smoothly varied by changing solvent composition (interfacial tension). Structure factors obtained by SANS can be quantitatively described in terms of an effective potential developed for star polymers. The experimental phase diagram reproduces to a high level of accuracy the predicted liquid/solid transition. Whereas for intermediate f a bcc phase is observed, for high f the formation of a fcc phase is preempted by glass formation.Comment: 5 pages, 4 figures, PRL in pres

Method and apparatus for making aligned flake composite wood material including integral baffles

A method and apparatus for forming a loosely felted mat of elongated wood flakes mixed with a binder, the mat including a longitudinal axis and the wood flakes being aligned in mutually parallel relation and parallel to the longitudinal axis of the mat. The wood flakes are held in alignment in the mat by a plurality of closely spaced thin planar baffles, the baffles being comprised of a material which can form an integral part of the mat.https://digitalcommons.mtu.edu/patents/1120/thumbnail.jp

Apparatus for forming mat of aligned flake composite wood material with continuous baffles

An apparatus is provided for forming a continuous loosely felted mat of wood flakes, the wood flakes being elongated and being aligned in mutually parallel relation and parallel to the longitudinal axis of the mat. The apparatus includes a conveyor having an upper surface adapted to support a mat of wood flakes and formers for continuously depositing wood flakes on the conveyor as it moves under the former. Also included are continuous lengths of baffle material positioned between the formers and the conveyor, and oriented so as to define parallel adjacent vertical planes, the planes being parallel to the direction of movement of the upper surface. The lengths of baffle material are positioned in closely spaced side-by-side relation and move with the upper surface beneath the formers as the loosely felted mat is formed and are adapted to cause the flakes to become aligned and to be held in alignment during formation of the mat.https://digitalcommons.mtu.edu/patents/1129/thumbnail.jp