Mound Systems: Pressure Distribution of Wastewater: Design and Construction in Ohio

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Process to Create High-Fidelity Lunar Dust Simulants

A method was developed to create high-fidelity lunar dust simulants that better match the unique properties of lunar dust than the existing simulants. The new dust simulant is designed to more closely approximate the size, morphology, composition, and other important properties of lunar dust (including the presence of nanophase iron). A two-step process is required to create this dust simulant. The first step is to prepare a feedstock material that contains a high percentage of agglutinate-like particles with iron globules (including nanophase iron). The raw material selected must have the proper mineralogical composition. In the second processing step, the feedstock material from the first step is jet-milled to reduce the particle size to a range consistent with lunar dust

Process to create simulated lunar agglutinate particles

A method of creating simulated agglutinate particles by applying a heat source sufficient to partially melt a raw material is provided. The raw material is preferably any lunar soil simulant, crushed mineral, mixture of crushed minerals, or similar material, and the heat source creates localized heating of the raw material

USING CHOICE EXPERIMENTS TO ELICIT FARMERS PREFERENCES? FOR CROP AND HEALTH INSURANCE

A random utility discrete choice experiments is used to determine farmers' preferences for health insurance, crop insurance, and a product that switches some portion of crop insurance subsidy to health insurance premium subsidy with access to large-pool risk groups.Risk and Uncertainty,

Comparison of Direct Solar Energy to Resistance Heating for Carbothermal Reduction of Regolith

A comparison of two methods of delivering thermal energy to regolith for the carbo thermal reduction process has been performed. The comparison concludes that electrical resistance heating is superior to direct solar energy via solar concentrators for the following reasons: (1) the resistance heating method can process approximately 12 times as much regolith using the same amount of thermal energy as the direct solar energy method because of superior thermal insulation; (2) the resistance heating method is more adaptable to nearer-term robotic exploration precursor missions because it does not require a solar concentrator system; (3) crucible-based methods are more easily adapted to separation of iron metal and glass by-products than direct solar energy because the melt can be poured directly after processing instead of being remelted; and (4) even with projected improvements in the mass of solar concentrators, projected photovoltaic system masses are expected to be even lower

Outreach Programs: 1911-1983

This departmental history was written on the occasion of the UND Centennial in 1983.https://commons.und.edu/departmental-histories/1046/thumbnail.jp

Review of Lunar Regolith Properties for Design of Low Power Lunar Excavators

Lunar regolith is the product of the intermittent comminution of rocks over extremely long durations, and as such is very different from familiar terrestrial soils. A limited amount of information on lunar regolith was collected by the Apollo space program for a few locations. Additional data is required to design effective excavators to prepare outpost sites and to mine the feedstock for production of the material required for a self-sustaining crewed base on the moon. On-site manufacturing would reduce significantly the mass of material that must be launched from Earth. This paper discusses what is known and what is yet unknown about the characteristics and anticipated behavior of lunar regolith as they pertain to efficient excavation operations on the moon. It also discusses the results of tests performed on lunar simulant in dry and frozen conditions and the effects of moisture content as well as temperature on the strength of the frozen material. The results of indentation tests will be presented along with discussion of the cutting forces required for mechanical excavation of the frozen regolith. Implications of material behavior on the design of the cutterhead of excavation systems will also be reviewed