Results 231 to 240 of about 1,555,580 (293)

Experimental and Theoretical Investigation of Quasi-Static System Level Behavior of Planetary Gear Sets

, 2021
This study presents a unique experimental methodology that synchronously measures various quasi-static responses of a simple four-planet planetary gear set, namely, planet load sharing, overall transmission error (OTE), and floating sun gear orbits ...
L. Ryali, A. Verma, I. Hong, David Talbot, F. Zhu   +4 more
semanticscholar   +1 more source

Future planetary probes for Jupiter and Saturn

Conference on Advanced Technology for Future Space Systems, 1979
This paper discusses a study that was conducted to identify the technology developments that would allow deep atmospheric investigations of Jupiter and Saturn to proceed beyond currently planned investigations of the upper atmosphere (above 20 bars). The study considered a deep-probe mission that would provide the capability to scientificall y examine ...
A. BUTTS, J. MURPHY
openaire   +1 more source

Probing planetary pollution from space

Environmental Science & Technology, 1991
The data sets obtained from instruments that have measured carbon monoxide and tropospheric ozone from space are reviewed. These instruments include a gas cell correlation radiometer named MAPS (Measurement of Air Pollution from Satellites), the Total Ozone Mapping Spectrometer, and the Stratospheric Aerosol and Gas Experiment.
openaire   +1 more source

Radio Occultation Experiment for Probing Planetary Ionospheres

2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 2019
Radio occultation (RO) is an important measurement technique for studying planetary atmospheres. It is based on the measurement of the frequency shift of the received radio signal from the spacecraft, caused by the bending of radio waves in the atmosphere.
Varun Sheel, Jayesh Pabari
openaire   +1 more source

Planetary Probe: Origin of Atmosphere of Venus

Science, 1969
The high temperatures and chemical composition, as determined by space probe and terrestrial observation, suggest that the present atmosphere of Venus has formed by chemical interaction with the lithosphere. Although the precise reactions have not been identified, good theoretical approximations to the molecular abundance may be obtained from reactions
openaire   +2 more sources

Great debate probes Pluto's planetary credentials

Physics World, 2008
It had all the trappings of an Olympic boxing final: two fiery competitors, a partisan crowd and the attention of the global press. But no individual gold medalist emerged from the Great Planet Debate held last month in Baltimore to discuss what type of astronomical object Pluto really is.
openaire   +1 more source

Mars Loss Could Sink Planetary Probes

Science, 1996
The loss of Russia's Mars '96 probe, just hours after launch last weekend, may also have doomed the country's once proud planetary space program. Astrophysics projects are expected to get the upper hand as future missions compete for scarce funds.
openaire   +1 more source

Technology Challenges for Planetary Probes to Dense Atmospheres

2008 IEEE Aerospace Conference, 2008
Both the 2003 Solar System Exploration Decadal Survey, by the National Research Council, and NASA's 2006 Solar System Exploration Roadmap identified Saturn, Jupiter, and Venus, as high priority scientific targets and recommended missions to explore them.
Tibor S. Balint, James A. Cutts, Elizabeth A. Kolawa   +2 more
openaire   +1 more source

A radio altimeter antenna for a planetary probe

IEEE Transactions on Antennas and Propagation, 1976
The design of a 400 MHz directional antenna for a space vehicle is presented. The design utilizes the spacecraft itself as an integral part of the antenna. The antenna has a gain of 4 dB over a dipole, a front to back ratio of 8 dB, and a - 6 dB beam angle of 34\deg . Design equations and experimental data are presented.
J. Beyer, J. Afanasjevs, N. Levanon
openaire   +1 more source

Thermal design and development of a planetary probe - Pioneer Venus large probe

2nd Thermophysics and Heat Transfer Conference, 1978
The thermal control system developed for the Large Atmospheric Probe of the Pioneer Venus Multiprobe Mission is described. The scope of the thermal control task requires maintaining the probe internal equipment shelf temperatures within a nonoperating range of -40 to 122 F and an operating range of -4 to 122 F during three different mission phases: (1)
L. HENNIS, M. VARON
openaire   +1 more source