Energy spectra of electrons from pi-mu-e decays in interstellar space.
Equilibrium energy distribution of electrons in space calculated from spectral decay of charged pions via pi-mu-e mode
PION↗
SEARCH · Engineering Papers
Results for “Milford”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Very high energy cosmic gamma rays.
Collision of cosmic rays and intergalactic gas to produce neutral pions which decay into high energy gamma rays
GAMMA RADIATION↗
Pion production in high energy cosmic ray collisions
Calculations on pion energy and angle distribution in center of hydrodynamic inelastic model for nucleon-nucleon collision
INELASTIC COLLISION↗
Investigation of lunar surface chemical contamination by LEM descent engine and associated equipment Final report
Lunar surface contamination from LEM rocket exhaust - methods of minimizing sample contamination
LUNAR EXCURSION MODULE /LEM/↗
Very high energy cosmic gamma rays.
Collision of cosmic rays and intergalactic gas to produce neutral pions which decay into high energy gamma rays
PION↗
Pion production in high-energy cosmic-ray collisions.
High energy cosmic ray collisional pion production spectrum and pion energy and angle distributions in CMS and laboratory frames from Landau- Milekhin hydrodynamic model of very high energy nucleon
NUCLEON-NUCLEON SCATTERING↗
Born cross-sections for double-transition collisions of hydrogen atoms.
Born cross sections for double-transition collisions of hydrogen atoms
ELECTRON TRANSITION↗
A diffusion model for the propagation of gases in the lunar atmosphere - Contamination by the Lunar Module exhaust.
Two-dimensional diffusion model for gas propagation in lunar atmosphere, discussing contamination by lunar module exhaust gases and solar wind loss mechanism
EXHAUST GAS↗
Radio-Frequency Strain Monitor
Radio-frequency (RF) strain monitor developed to measure lengths of objects. RF waveguide or cable bonded to structure monitored. Propagation of RF signal along waveguide results in phase shift proportional to length of path traveled. Impedance mismatches placed in RF cable at nodes of structure. Records mismatches and detects overall length of line and lengths of intervals between nodes. Used to detect changes in elements of large structure with single cable. Monitor has potential for many applications, including monitoring stability of such large structures as aircraft, bridges, and buildings in Earthquake zones.
Heyman, Joseph S.↗
Radio Frequency (RF) strain monitor
This invention relates to an apparatus for measuring strain in a structure. In particular, the invention detects strain in parts per million to over ten percent along an entire length (or other dimension) of a structure measuring a few millimeters to several kilometers. By using a propagation path bonded to the structure, the invention is not limited by the signal attenuation characteristics of the structure and thus frequencies in the megahertz to gigahertz range may be used to detect strain in part per million to over ten percent with high precision.
Heyman, Joseph S.↗
An amplitude modulated laser system for distance and displacement measurement
A laser distance and displacement measurement system is being developed to monitor small displacements in large space structures for strain analysis and structural control. The reflected laser beam is focused on a detector and the detected signal is mixed with the reference. Small displacements are indicated by a change in modulation frequency which is adjusted to maintain quadrature between the received signal and the reference signal from the voltage-controlled oscillator in a phase-locked loop. Measurement of absolute distance is accomplished by sweeping the modulation frequency from a quadrature lock point to an adjacent lock point.
Rogowski, Robert S.↗
Cooperative implementation of a high temperature acoustic sensor
The current status and results of a cooperative program aimed at the implementation of a high-temperature acoustic/strain sensor onto metallic structures are reported. The sensor systems that are to be implemented under this program will measure thermal expansion, maneuver loads, aircraft buffet, sonic fatigue, and acoustic emissions in environments that approach 1800 F. The discussion covers fiber development, fabrication of an extrinsic Fabry-Perot interferometer acoustic sensor, sensor mounting/integration, and results of an evaluation of the sensor capabilities.
Baldini, S. E.↗
Asteroseismology with FRESIP: A meter class space telescope
The requirements for asteroseismology and searching for occulting inner planets are similar. The FRESIP mission will be suited to making asteroseismology measurements. Recommendation: Use 30-60 second integrations from one or more CCD's in the FRESIP mosaic, sampled continuously for the entire mission to measure stellar non-radial oscillations with amplitudes of parts per million and frequencies of 0.1 to 10 MHz. These measurements lead to determination of stellar interior helium abundances, rotation rates, depth of convection zones and measuring stellar cycle frequency changes for a variety of stellar types, enabling major advances in stellar structure and evolutionary theories.
Milford, Peter↗
Time-Distance Helioseismology with the MDI Instrument: Initial Results
In time-distance helioseismology, the travel time of acoustic waves is measured between various points on the solar surface. To some approximation, the waves can be considered to follow ray paths that depend only on a mean solar model, with the curvature of the ray paths being caused by the increasing sound speed with depth below the surface. The travel time is effected by various inhomogeneities along the ray path, including flows, temperature inhomogeneities, and magnetic fields. By measuring a large number of times between different locations and using an inversion method, it is possible to construct 3-dimensional maps of the subsurface inhomogeneities. The SOI/MDI experiment on SOHO has several unique capabilities for time-distance helioseismology. The great stability of the images observed without benefit of an intervening atmosphere is quite striking. It his made it possible for us to detect the travel time fo separations of points as small as 2.4 Mm in the high-resolution mode of MDI (0.6 arc sec 1/pixel). This has enabled the detection of the supergranulation flow. Coupled with the inversion technique, we can now study the 3-dimensional evolution of the flows near the solar surface.
Duvall, T. L., Jr.↗
Mars ROCKS! in North Dakota, Solar System Ambassador Program in North Dakota
Mars is Rock'n in the Midwest! With a total of 5 currently running space missions exploring the red planet, what can teachers locally do to bring Mars into the classroom and capitalize on free and low-cost resources to teach Earth Science in terms of Mars? The NASA/JPL Solar System Ambassador is one such resource that Earth science teachers in the region can utilize. Currently only one Solar System Ambassador exists in the whole state of North Dakota. North Dakota is a rural state with the majority of its population concentrated on the eastern frindges which include the cities of Grand Forks and Fargo. The ruralness of the rest of the state provide a interesting challenge for any outreach program especially the solar system ambassador program.
Milford, C. R.↗
Radio frequency strain monitor
A radio frequency strain monitor includes a voltage controlled oscillator for generating an oscillating signal that is input into a propagation path. The propagation path is preferably bonded to the surface of a structure to be monitored and produces a propagated signal. A phase difference between the oscillating and propagated signals is detected and maintained at a substantially constant value which is preferably a multiple of 90.degree. by changing the frequency of the oscillating signal. Any change in frequency of the oscillating signal provides an indication of strain in the structure to which the propagation path is bonded.
Heyman, Joseph S.↗
Wastewater to Plant Nutrient System
Vision and Mission Statement During human space exploration missions longer than 30 days (500 days to indefinite; as defined by NASA strategic plan), a spacefaring crew will generate liquid waste that can be recovered and processed to create nutrients for a plant food production system. In addition, the sodium in urine has a potential to build-up in the system and is not useful as a plant fertilizer since it can stress plants at high concentrations. Finding a way to separate these products and retrieve them for other use is critical for long duration missions. This is useful since it can greatly reduce the amount of overall mission mass.
Robert Gitten↗