Design, performance, fabrication and material considerations for high-pressure vessels /

"March 1964."

Thermal properties of high-temperature materials /

"June 1964."

A survey of electroforming for fabricating structures /

"October 1964."

The processing and properties of Hastelloy C /

"May 1964."

Survey of alternating-current power supplies for welding /

"November 1964."

Adhesive bonding of titanium and its alloys /

"August 1965."

Silicon carbide for semiconductors /

"February 1965."

Machining and grinding of titanium and its alloys /

"August 1965."

The effects of gas occlusions and strains on the magnetic properties of thin permalloy films /

"May 1965."

Survey of available high pressure pneumatic components : (5,000 PSI and UP) /

"July 1954."

Preindications of failure in electronic components /

"July 1965."

Telstar I.

Cover title. "Published in accordance with the cooperative agreement executed on July 27, 1961, between the National Aeronautics and Space Administration and the American Telephone and Telegraph Company ... The report consists of four volumes. The first three arear issue of the Bell System technical journal. The fourt composed of papers originally published together as a regulh volume ... pertinent papers contributed by various authors."

Preliminary results from the infrared multilayer filters and materials exposed to the space environment on the NASA LDEF mission

With continually increasing demands for improvements to atmospheric and planetary remote-sensing instrumentation, for both high optical system performance and extended operational lifetimes, an investigation to access the effects of prolonged exposure of the space environment to a series of infrared interference filters and optical materials was promoted on the NASA LDEF mission. The NASA Long Duration Exposure Facility (LDEF) was launchd by the Space Shuttle to transport various science and technology experiments both to and from space, providing investigators with the opportunity to study the effects of the space environment on materials and systems used in space-flight applications. Preliminary results to be discussed consist of transmission measurements obtained and processed from an infrared spectrophotometer both before (1983) and after (1990) exposure compared with unexposed control specimens, together with results of detailed microscopic and general visual examinations performed on the experiment. The principle lead telluride (PbTe) and Zinc Sulphide (ZnS) based multilayer filters selected for this preliminary investigation consist of : an 8-12µm low pass edge filter, a 10.6µm 2.5% half bandwidth (HBW) double half-wave narrow bandpass filter, and a 10% HBW triple half-wave wide bandpass filter at 15µm. Optical substrates of MgF2 and KRS-5 (T1BrI) will also be discussed.

Doppler Orbit Determination of Deep Space Probes by the Bernese GNSS Software: First Results of the Combined Orbit Determination from DSN and Inter-Satellite Ka-Band Data from the Grail Mission

Navigation of deep space probes is most commonly operated using the spacecraft Doppler tracking technique. Orbital parameters are determined from a series of repeated measurements of the frequency shift of a microwave carrier over a given integration time. Currently, both ESA and NASA operate antennas at several sites around the world to ensure the tracking of deep space probes. Just a small number of software packages are nowadays used to process Doppler observations. The Astronomical Institute of the University of Bern (AIUB) has recently started the development of Doppler data processing capabilities within the Bernese GNSS Software. This software has been extensively used for Precise Orbit Determination of Earth orbiting satellites using GPS data collected by on-board receivers and for subsequent determination of the Earth gravity field. In this paper, we present the currently achieved status of the Doppler data modeling and orbit determination capabilities in the Bernese GNSS Software using GRAIL data. In particular we will focus on the implemented orbit determination procedure used for the combined analysis of Doppler and intersatellite Ka-band data. We show that even at this earlier stage of the development we can achieve an accuracy of few mHz on two-way S-band Doppler observation and of 2 µm/s on KBRR data from the GRAIL primary mission phase.

Computers in aeronautics and space research at the Lewis Research Center /

"Sep 90"--P. [12].