Topic: NASA Technical Reports Server (NTRS)
The investigation described in this report was made to determine the change in aerodynamic forces and moments produced by split flaps in a steady spin. The test were made with the spinning balance in the NACA 5-foot vertical wind tunnel. A low-wing monoplane model was tested with and without the split flaps in 12 spinning attitudes chosen to cover the probable spinning range. The changes in coefficients produced by adding the split flaps are given for longitudinal force, normal force, and...
Topic: NASA Technical Reports Server (NTRS)
Satellite situation report
Topic: NASA Technical Reports Server (NTRS)
Protection device for sealed surfaces is placed over the polished surface entrance of trapped bosses and removed when the seal fitting has been engaged with the boss threads. This technique applies to various seal types used in close fitting, spring loaded, threaded fittings.
Topic: NASA Technical Reports Server (NTRS)
Loss process for helium ions in upper atmosphere
Topic: NASA Technical Reports Server (NTRS)
Effects of tissue preparation and extractive procedures on the intensity of radioautographic labeling are presented in terms of mean grain count per cell in cells labeled with tritiated precursors of proteins or nucleic acids. This information would be of interest to medical researchers and cytologists.
Topic: NASA Technical Reports Server (NTRS)
Numerical solution of coupled, nonlinear, equation of motion for rigid blade to simulate response sensitivity and blade-motion stability of fully articulated rotor
Topic: NASA Technical Reports Server (NTRS)
Internal energy partition function of atom or ion immersed in plasma - astrophysical application
Topic: NASA Technical Reports Server (NTRS)
Digital computer program determines tolerance values of end to end signal chain or flow path, given preselected probability value. Technique is useful in the synthesis and analysis phases of subsystem design processes.
Topic: NASA Technical Reports Server (NTRS)
Development of prototype miniaturized microphone for electrocardiography
Topic: NASA Technical Reports Server (NTRS)
Measurements of electrical conductivity, ultrasonic surface wave attenuation, and internal friction loss were made on aluminum alloys 7079-T6, 2219-T31, and 2219-T81 as a function of the onset of stress corrosion.
Topic: NASA Technical Reports Server (NTRS)
Computer program determines the forced vibration in three dimensional space of a multiple degree of freedom beam type structural system. Provision is made for the longitudinal axis of the analytical model to change orientation at any point along its length. This program is used by industries in which structural design dynamic analyses are performed.
Topic: NASA Technical Reports Server (NTRS)
Method and apparatus for adjusting thermal conductance in electronic components for space use
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Experimental investigation of multiple-jet liquid injection into hypersonic flow
Topic: NASA Technical Reports Server (NTRS)
Solar extreme ultraviolet and corpuscular radiation effects on upper atmospheric temperature
Topic: NASA Technical Reports Server (NTRS)
Light, thin-film heating element is formed by vacuum deposition of metal onto a nonconductive surface to be heated. This small-sized heater has a very fast response time.
Topic: NASA Technical Reports Server (NTRS)
Annotated bibliography of NASA technical briefs on electrical, energy sources, materials, life sciences, and mechanical information
Topic: NASA Technical Reports Server (NTRS)
Nut and bolt fastener permitting all-directional movement of skin sections with respect to supporting structure
Topic: NASA Technical Reports Server (NTRS)
Examination of molybdenum disulfide with LEED and Auger emission spectroscopy
Topic: NASA Technical Reports Server (NTRS)
Two short turbojet combustors designed for use with vaporized hydrocarbon fuels were tested in a one-quarter annular duct. The experimental combustors consisted of many small "swirl-can" combustor elements manifolded together. This design approach allowed the secondary mixing zone to be considerably reduced over that of conventional combustors. The over-all combustion lengths, for the two configurations were 13.5 and 11.0 inches, approximately one-half the length of the shortest...
Topic: NASA Technical Reports Server (NTRS)
OGO-C observation of sudden magnetic field change and propagation of perturbation to magnetotail on 8 July 1966
Topic: NASA Technical Reports Server (NTRS)
The evaporation velocity of liquid droplets under various conditions is theoretically calculated and a number of factors are investigated which are neglected in carrying out the fundamental equation of Maxwell. It is shown that the effect of these factors at the small drop sizes and the small weight concentrations ordinarily occurring in fog can be calculated by simple corrections. The evaporation process can be regarded as quasi-stationary in most cases. The question at hand, and also the...
Topic: NASA Technical Reports Server (NTRS)
Suspended mass oscillation damper based on impact energy absorption for damping wind induced oscillations of tall stacks, antennas, and umbilical towers
Topic: NASA Technical Reports Server (NTRS)
Heat transfer coefficients for supersonic flow near two-dimensional protuberances in turbulent supersonic boundary layer
Topic: NASA Technical Reports Server (NTRS)
Cross section calculations for electron impact ionization and excitation of hydrogen molecules
Topic: NASA Technical Reports Server (NTRS)
Evaluation of various laboratory determination of oxygen in potassium and sodium
Topic: NASA Technical Reports Server (NTRS)
Elastic displacements for various edge-cracked plate specimens using boundary collocation computing procedures
Topic: NASA Technical Reports Server (NTRS)
Thermal stresses, which may result from transient heating, can cause changes in the effective stiffness of wing structures. Some effects of this change in stiffness were investigated experimentally by radiantly heating three types of simple wing structures: a uniform plate, a solid double-wedge section, and a circular-arc multiweb-wing section. Changes in stiffness were determined by measuring the changes in natural frequency of vibration during transient heating. Some comparisons are made...
Topic: NASA Technical Reports Server (NTRS)
Research and development of mercury electron bombardment thrusters
Topic: NASA Technical Reports Server (NTRS)
The transient behavior of liquid hydrogen, under conditions of zero gravity, was studied photographically. The hydrogen was subjected to weightlessness by dropping a Dewar containing this liquid from a height of 9 feet. During the weightless period of approximately 3/4 second, the liquid rose along the walls of the Dewar into the original vapor space. The rise occurred at constant velocity for practically the entire duration of this period. Adhesive forces were concluded to be the primary cause...
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Radiation sensitivity of electronic instruments susceptible to neutron and gamma radiation is evaluated by means of a radioisotope thermoelectric generator /RTG/. The gamma field of the RTG affects instrument operation and requires shielding, the neutron field does not affect operation via secondary capture-gamma production.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Scaling method to predict opening characteristics of parachute from model drop test results
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
X radiation in binary stars
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Rigorous analytical technique, called criticality determination methodology /or CD technique/ determines the probability that a given complex system will successfully achieve stated objectives. The CD technique identifies critical elements of the system by a failure mode and effects analysis.
Topic: NASA Technical Reports Server (NTRS)
The road blocks and mental blocks in areas where automation is not taking care of basic documentation problems are discussed. Original project documentation, documentation for project maintenance, and comparison of preliminary and final documentation are described. The use of flow charts is also mentioned.
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
The effect of various pre-treatments on the elastic strain coefficient (alpha) (defined as the reciprocal of the modulus of elasticity E) (Epsilon) and on the mechanical hysteresis of copper has been investigated. Variables comprising the pre-treatments were pre-straining by stretching in a tensile testing machine and by drawing through a die, aging at room and elevated temperatures and annealing. The variation of the elastic strain coefficient with test stress was also investigated.
Topic: NASA Technical Reports Server (NTRS)
Report on the thermal conductivity and dielectric constant of nonmetallic materials evaluates the mechanisms of heat transfer in evacuated silicate powders and establishes the complex dielectric constant of these materials. Experimental measurements and results are related to postulated lunar surface materials.
Topic: NASA Technical Reports Server (NTRS)
Radiation effects on silicon voltage regulator Zener diodes for nuclear space power systems
Topic: NASA Technical Reports Server (NTRS)
Fabrication of uranium mononitride compacts
Topic: NASA Technical Reports Server (NTRS)
Design of pulse position modulation optical communication system
Topic: NASA Technical Reports Server (NTRS)
Topic: NASA Technical Reports Server (NTRS)
