Titlebook: Use of Extraterrestrial Resources for Human Space Missions to Moon or Mars; Donald Rapp Book 2018Latest edition Springer International Pub

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Refueling Spacecraft in LEO Using Propellants Derived from the Moon or Asteroids,metric tons in LEO when propellants are brought from Earth, if fueled by hydrogen and oxygen from the Moon would have a mass of only about 100 metric tons. This would have a huge impact on the feasibility of launching large Mars-bound vehicles.

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s shown that the adaptive nonlinear static analysis, with displacements load pattern, caught, with enough accuracy, the behavior of irregular building structures of low and medium height. The nonlinear static analyses may not sufficiently predict the seismic demand for the tallest building structure

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Donald Rapplimitations of this method of analysis are also pointed out. The recent drive for use of performance-based approach for design as well as assessment of building structures has led to rapid developments to enhance the reliability of this analytical approach.

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