Engineering topics
Collins, G.
Publications and source records attributed to Collins, G..
DARe: Dark Asteroid Rendezvous
Small bodies record the chemical, physical, and dynamical processes that gave birth to and shaped the solar system. The great variety of small bodies reflects the diversity of both their genesis and their histories. The DARe mission conducts a critical test of how small body populations reflect a history of planetary migration and planetesimal scattering. This understanding is crucial for planning future NASA missions and placing current and past missions into context.
Revisiting the West Clearwater Lake Impact Structure, Canada
The West and East Clearwater Lake impact structures are two of the most distinctive and recognizable impact structures on Earth. Known regionally as the "Clearwater Lake Complex", these structures are located in northern Quebec, Canada (56 deg 10 N, 74 deg 20 W) approximately 125 km east of Hudson Bay. The currently accepted diameters are 36 km and 26 km for the West and East structures, respectively. Long thought to represent a rare example of a double impact, recent age dating has called this into question with ages of approximately 286 Ma and approximately 460-470 Ma being proposed for the West and East structures, respectively. Relatively little is known about the East Clearwater Lake structure. There is no surface exposure and what information there is comes from geophysics and two drill cores obtained in the 1960s. In contrast, the West Clearwater Lake structure is relatively well preserved with large ring of islands in the approximately 30 km diameter lake. Much of the work done on West Clearwater stems from field investigations carried out in 1977 driven by the Apollo program, with a focus on the impact melt rocks and other impactites, which are well exposed on the ring of islands. To our knowledge, the Clearwater Lake impact structures have not been the focus of detailed impact geology field investigations since the 1977 expedition and the only geological map that exists is from the 1960s and is at the reconnaissance level. Our knowledge of impact cratering processes have increased substantially since this time, as have the analytical techniques available for samples. This provided the motivation for a joint Canadian-US-UK expedition to the West Clearwater Lake impact structure in August and September 2015, under the auspices of the FINESSE (Field Investigations to Enable Solar System Science and Exploration) project, part of NASA's Solar System Exploration Research Virtual Institute (SSERVI). We focus here on the impactites of the West Clearwater Lake impact structure. Other ongoing studies, also presented at this conference, focus on central uplift formation, the impact-generated hydrothermal system, xxxx and using WCIS as an analog test site for crew studies of sampling protocols].
Cassini Imaging Results at Titan
The Cassini Imaging Science Subsystem (ISS) images show striking albedo markings on the surface of Titan. In equatorial regions the albedo patterns have high contrast and exhibit prominent lineaments and linear/angular boundaries suggestive of tectonic influences or fracturing of brittle surficial materials. There are intriguing dark curving lines near the south pole. Here we present several working hypotheses to explain these patterns. We also briefly summarize atmospheric science results.
High-Resolution Images of Io from Galileo SSI
Galileo has returned new high-resolution images of Io. Here we provide an overview of the encounters and science results.
AF Ni-Cd cell qualification program
The present status of the USAF NiCd cell qualification program, which is underway at the Naval Surface Warfare Center-Crane Division, is summarized. The following topics are discussed: overview; background; purpose; stress tests; results for super Ni-Cd; results for SAFT cells; GPS stress test; GPS simulated orbit; and results for gates cells. The discussion is presented in viewgraph format.
Air Force Ni-Cd cell qualification program update
The generic qualification of aerospace nickel-cadmium cells is discussed. The test program includes the following: all available manufacturers, all available designs, cells from the previous program, and high and low orbit life cycling. It is the purpose of this program to characterize the beginning of life performance.
Saturn 1B program. Test report for globe valve, 2 inch, 6000 PSIG, Vacco Valve Company, part number M-6P-X469-2G /with modification kit KM 7403/
Operation and environment test of 2 inch manually operated Globe Valve for use in high pressure helium
Manual globe valve, 3/4-inch, 6000 psig, Accessory Products Company, part no. 5072X1004-/13, 23/ test report
Environmental tests of manual globe valves for high pressure helium storage tanks
Test report for Check Valve 1/2-inch, spring-poppet James, Pond, and Clark part number 220T6-8TT-3 NASA part number 75M12944 FCV-9
Acceptance testing of check valve used in piping for spacecraft support system
Relief valve, 3/8-inch, Mission Pump and Valve Co. part number 1-3688, NASA part number 75M15044 PRV-4 Test report
Test program for relief valve used to prevent over pressurization in pneumatic control systems