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"A visual stunner....The format is wonderfully inventive--once the traveler arrives in the city, the book is flipped over and read back to the beginning, with the black-and-white pictures taking on new meanings....Sure to delight and fascinate."--Publishers Weekly.
Analysis of Trajectory Parameters for Probe and Round-trip Missions to Venus by James F. Dugan,Carl R. Simsic Pdf
For one-way transfers between Earth and Venus, charts are obtained that show velocity, time, and angle parameters as functions of the eccentricity and semilatus rectum of the Sun-focused vehicle conic. From these curves, others are obtained that are useful in planning one-way and round-trip missions to Venus. The analysis is characterized by circular coplanar planetary orbits, successive two-body approximations, impulsive velocity changes, and circular parking orbits at 1.1 planet radii. For round trips the mission time considered ranges from 65 to 788 days, while wait time spent in the parking orbit at Venus ranges from 0 to 467 days. Individual velocity increments, one-way travel times, and departure dates are presented for round trips requiring the minimum total velocity increment. For both single-pass and orbiting Venusian probes, the time span available for launch becomes appreciable with only a small increase in velocity-increment capability above the minimum requirement. Velocity-increment increases are much more effective in reducing travel time for single-pass probes than they are for orbiting probes. Round trips composed of a direct route along an ellipse tangent to Earth's orbit and an aphelion route result in the minimum total velocity increment for wait times less than 100 days and mission times ranging from 145 to 612 days. Minimum-total-velocity-increment trips may be taken along perihelion-perihelion routes for wait times ranging from 300 to 467 days. These wait times occur during missions lasting from 640 to 759 days.
Historians of migration will welcome Mark Wyman's new book on the elusive subject of persons who returned to Europe after coming to the United States. Other scholars have dealt with particular national groups... but Wyman is the first to treat... every major group.... Wyman explains returning to Europe as not just the fulfillment of original intentions but also the result of 'anger at bosses and clocks, nostalgia for waiting families,' nativist resentment and heavy-handed Americanization programs, and a complex of other problems.... Wyman's 'nine broad conclusions' about the returnees deserve to be read by everyone concerned with international migration.
Minimum Propellant Consumption Round-trip Trajectories to Mars for Constant-thrust, Constant-specific-impulse Vehicles with Optimum Coasting Periods by Charles L. Zola,Laurence H. Fishbach Pdf
Round Trip to Hades in the Eastern Mediterranean Tradition by Anonim Pdf
Round Trip to Hades in the Eastern Mediterranean Tradition explores the theme of visits to the underworld in the ancient Greek and Byzantine traditions from a broad perspective including written sources, iconography and archaeology.
