155,734 research outputs found
Trajectory-correction propulsion system Patent
Spacecraft trajectory correction propulsion syste
On defining bruxism
In a series of recent publications, orofacial researchers have debated the question of how ‘bruxism’ should be defined for the purposes of accurate diagnosis and reliable clinical research. Following the principles of realism-based ontology, we performed an analysis of the arguments involved. This revealed that the disagreements rested primarily on inconsistent use of terms, so that issues of ontology were thus obfuscated by shortfalls in terminology. In this paper, we demonstrate how bruxism terminology can be improved by paying attention to the relationships between (1) particulars and types, and (2) continuants and occurrents
Compartmental analysis and missing data techniques in stationary time series
Time series and compartmental analysis techniques for biological application
Time series analysis with missing data Semiannual status report, 1 Jun. - 30 Nov. 1969
Parameters of multivariate normal distribution for time series analysis with missing dat
Formation of Topological Black holes from Gravitational Collapse
We consider the gravitational collapse of a dust cloud in an asymptotically
anti de Sitter spacetime in which points connected by a discrete subgroup of an
isometry subgroup of anti de Sitter spacetime are identified. We find that
black holes with event horizons of any topology can form from the collapse of
such a cloud. The quasilocal mass parameter of such black holes is proportional
to the initial density, which can be arbitrarily small.Comment: latex, 16 pages, four postscript figure
Flight experience with altitude hold and Mach hold autopilots on the YF-12 aircraft at Mach 3
The altitude hold mode of the YF-12A airplane was modified to include a high-pass-filtered pitch rate feedback along with optimized inner loop altitude rate proportional and integral gains. An autothrottle control system was also developed to control either Mach number or KEAS at the high-speed flight conditions. Flight tests indicate that, with the modified system, significant improvements are obtained in both altitude and speed control, and the combination of altitude and autothrottle hold modes provides the most stable aircraft platform thus far demonstrated at Mach 3 conditions
Barium release system
A chemical system is described for releasing a good yield of free barium neutral atoms and barium ions in the upper atmosphere and interplanetary space for the study of the geophysical properties of the medium. The barium is released in the vapor phase so that it can be ionized by solar radiation and also be excited to emit resonance radiation in the visible range. The ionized luminous cloud of barium becomes a visible indication of magnetic and electrical characteristics in space and allows determination of these properties over relatively large areas at a given time
Rocket having barium release system to create ion clouds in the upper atmosphere
A chemical system for releasing a good yield of free barium atoms and barium ions to create ion clouds in the upper atmosphere and interplanetary space for the study of the geophysical properties of the medium is presented
- …