The Helios experiment 5 antenna mechanism

The Experiment 5 Antenna deployment problem onboard Helios A, the failure analysis, and changes in design, test, and operation which led to a successful deployment of both antennas during the early Helios B mission phase are described

Artificial electromagnetism for neutral atoms: Escher staircase and Laughlin liquids

We show how lasers may create fields which couple to neutral atoms in the same way that the electromagnetic fields couple to charged particles. These fields are needed for using neutral atoms as an analog quantum computer for simulating the properties of many-body systems of charged particles. They allow for seemingly paradoxical geometries, such as a ring where atoms continuously reduce their potential energy while moving in a closed path. We propose neutral atom experiments which probe quantum Hall effects and the interplay between magnetic fields and periodic potentials.Comment: 4 pages, 1 color figure, RevTeX 4; v2 Revised introduction, additional reference

The Helios mechanical despin drive assembly for the high-gain antenna reflector

Helios is the German-American solar probe which comes within 0.31 Astronomical Units of the sun. A special thermal design and a dry lubrication system have resulted in successful operation up to now, with Helios having finished its first orbit around the sun

The structure of separated flow regions occurring near the leading edge of airfoils including transition

All the time and effort was directed toward acquiring, reducing, and analyzing more hot-wire anemometer data. Some static pressure distribution data were also acquired to support the analysis of the velocity profile data. Laser Doppler Velocimetry data were not acquired due to equipment problems. Included were seven combinations of chord Reynolds number, angle of attack, and acoustic forcing using the NACA 663-018 airfoil. This research has as its objective the detailed documentation of the structure and behavior of the transitional separation bubble and the redeveloping boundary layer after reattachment over an airfoil at low Reynolds numbers. The intent is to further the understanding of the complex flow phenomena so that analytic methods for predicting their formulation and development can be improved. These analytic techniques have applications in the design and performance prediction of airfoils operating in the low Reynolds number flight regime

Rural Health Insurance and Competitive Markets: Not Always Compatible?

Health Insurance, Rural Health, Health Markets, Competition, Health Policy, Health Economics and Policy,

Interdisciplinary research concerning the nature and properties of ceramic materials

Interdisciplinary research on properties of ceramic materials with emphasis on refractory surface insulatio

Interdisciplinary research concerning the nature and properties of ceramic materials Semiannual status report, 16 Jun. - 15 Dec. 1969

Research status reports in ceramic materials including chemical, mechanical, atomic, and molecular propertie

The structure of separated flow regions occurring near the leading edge of airfoils, including transition

The structure and behavior of the separation bubble including transition and the redeveloping boundary layer after reattachment over an airfoil at low Reynolds numbers was studied. The intent is to further the understanding of the complex flow phenomena so that analytic methods for predicting their formation and development can be improved. These analytic techniques have applications in the design and performance prediction of airfoils operating in the low Reynolds number flight regime

Multidisciplinary research activity in the materials sciences with emphasis on ceramic materials Semiannual status report, Jun. 16 - Dec. 15, 1967

Effects of various energy environments on zirconium-oxygen-carbon system, solid state ceramics, surface properties, and ceramic materials processin