69,914 research outputs found
Gravity stabilized flying vehicle Patent
Hovering type flying vehicle design and principle mechanisms for manned or unmanned us
Training vehicle for controlling attitude Patent
Attitude control training device for astronauts permitting friction-free movement with five degrees of freedo
Subgravity simulator Patent
Apparatus for training astronaut crews to perform on simulated lunar surface under conditions of lunar gravit
Pneumatic amplifier Patent
Pneumatic servoamplifier for controlling flow regulatio
Hand-held self-maneuvering unit Patent
Hand-held maneuvering unit for propulsion and attitude control of astronauts in zero or reduced gravity environmen
Fluid power transmission Patent
Fluid power transmission and gas bearing syste
Pneumatic power is transmitted through air bearing
A more efficient method for supplying high pressure air to an air bearing and pneumatic equipment mounted on it has been developed. The system uses a conventional air bearing and an air-supported sphere with a central passage. High pressure air is channeled through it into the pneumatic equipment on the sphere
Coupled-cluster calculations of properties of Boron atom as a monovalent system
We present relativistic coupled-cluster (CC) calculations of energies,
magnetic-dipole hyperfine constants, and electric-dipole transition amplitudes
for low-lying states of atomic boron. The trivalent boron atom is
computationally treated as a monovalent system. We explore performance of the
CC method at various approximations. Our most complete treatment involves
singles, doubles and the leading valence triples. The calculations are done
using several approximations in the coupled-cluster (CC) method. The results
are within 0.2-0.4% of the energy benchmarks. The hyperfine constants are
reproduced with 1-2% accuracy
Demographic change in the northern forest
This brief examines the population redistribution in the Northern Forest, which includes thirty-four counties scattered across northern and central Maine, New Hampshire, New York, and Vermont. Authors Ken Johnson, Susan Stewart, and Miranda Mockrin report that the population of the Northern Forest grew modestly between 2000 and 2010, and the population gains were greatest in recreational areas and least in manufacturing areas. Racial and ethnic diversity is also growing in the Northern Forest, and the population is getting older due to aging in place among current residents and net outmigration among younger populations
Heat-transfer and pressure measurements on a simulated elevon deflected 30 deg near flight conditions at Mach 7
Heat transfer rates and pressures were obtained on an elevon plate (deflected 30 deg) and a flat plate upstream of the elevon in an 8 foot high-temperature structures tunnel. The flight Reynolds number and flight total enthalpy for altitudes of 26.8 km and 28.7 km at Mach seven were duplicated. The heat transfer and pressure data were used to establish heating and pressure loads. The measured heating was compared with several theoretical predictions, and the closest agreement obtained with a Schultz-Grunow reference enthalpy method of calculation
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