Pressure effects on postulated lunar materials

Wechsler, A. E.; Glaser, Peter E.

doi:10.1016/0019-1035(65)90038-2

Cited by 142 publications

(75 citation statements)

References 20 publications

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“…Previous interpretations of Martian thermal inertia data in terms of particle sizes have utilized the relationship between these quantities presented by Kieffer et al [1973], which is based primarily upon measurements of the thermal properties of quartz sands [Wechsler and Glaser, 1965 …”

Section: Inferred Particle Propertiesmentioning

confidence: 99%

Dark material in the polar layered deposits and dunes on Mars

Herkenhoff¹,

Vasavada²

1999

J. Geophys. Res.

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Section: Inferred Particle Propertiesmentioning

confidence: 99%

Dark material in the polar layered deposits and dunes on Mars

Herkenhoff¹,

Vasavada²

1999

J. Geophys. Res.

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“…A l l measuring instrumentation is common to both methods, with the exception of the added circuitry of the DLS. Since the sample is the same in both cases, this means, of course, that theoretically the conductivities measured should be identical, The criteria upon which this comparison is based are the following: ( i) apparatus required, (2) pretest conditions, ( 3 ) data reduction, (4) time comparison, ( 5) heater voltage effects, and ( 6) consistency of results.…”

mentioning

confidence: 99%

A Comparison of Two Transient Methods of Measuring Thermal Conductivity of Particulate Samples

Scott

Fountain

West

1973

Review of Scientific Instruments

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A comparison is made of the line source (LS) method and the differential line source (DLS) method of measuring thermal conductivity of particulate materials in vacuum. The DLS method requires more instrumentation in the measuring circuitry (an additional amplifier and a differentiating circuit), but since it does not require a stable temperature to initiate a test, it does not need a sample temperature control system. DLS tests can be taken as the temperature in the samples is rising from liquid nitrogen temperature to room temperature. This eliminates the practice of extrapolating thermal conductivity over this large temperature range. Also, the advantages of reduced test time, data reduction time, and small sample temperature rise enable the experimenter to take about 7–12 DLS tests in the time of 2 LS tests. Test data from the two methods agree very well. The DLS method gives slightly lower conductivity values for the small particles tested. The difference between the two methods is smaller at low temperatures than at high temperatures. The agreement in the large particle tests at room temperature is good. An error analysis shows that the LS and the DLS have total relative errors of 18 and 20%, respectively.

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“…From these experiments, particle shape appears to affect thermal conductivity primarily through the control of the bulk density of the deposit. Although the thermal conductivity of materials made up of conchoidally shaped particles have been measured previously, [Wechsler and Glaser, 1965;Smoluchowski, 1910 Furthermore, the effect of flat particle shapes, as found in clayrich sediments, also has not been investigated. Clearly, laboratory measurements of other, more complex natural surfaces would be valuable in order to interpret the thermal conductivity measured in terms of the physical properties of the surficial materials.…”

Section: Ice Quantificationmentioning

confidence: 99%

Deep Space 2: The Mars Microprobe Mission

Smrekar¹,

Catling²,

Lorenz³

et al. 1999

J. Geophys. Res.

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Abstract. The Mars Microprobe Mission will be the second of the New Millennium Program's technology development missions to planetary bodies. The mission consists of two penetrators that weigh 2.4 kg each and are being carried as a piggyback payload on the Mars Polar Lander cruise ring. The spacecraft arrive at Mars on December 3, 1999. The two identical penetrators will impact the surface at---190 m/s and penetrate up to 0.6 m. They will land within 1 to 10 km of each other and---50 km from the Polar Lander on the south polar layered terrain. The primary objective of the mission is to demonstrate technologies that will enable future science missions and, in particular, network science missions. A secondary goal is to acquire science data. A subsurface evolved water experiment and a thermal conductivity experiment will estimate the water content and thermal properties of the regolith. The atmospheric density, pressure, and temperature will be derived using descent deceleration data. Impact accelerometer data will be used to determine the depth of penetration, the hardness of the regolith, and the presence or absence of 10 cm scale layers.

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Pressure effects on postulated lunar materials

Cited by 142 publications

References 20 publications

Dark material in the polar layered deposits and dunes on Mars

Dark material in the polar layered deposits and dunes on Mars

A Comparison of Two Transient Methods of Measuring Thermal Conductivity of Particulate Samples

Deep Space 2: The Mars Microprobe Mission

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