Tracking 3-D body motion for docking and robot control

An advanced method of tracking three-dimensional motion of bodies has been developed. This system has the potential to dynamically characterize machine and other structural motion, even in the presence of structural flexibility, thus facilitating closed loop structural motion control. The system's operation is based on the concept that the intersection of three planes defines a point. Three rotating planes of laser light, fixed and moving photovoltaic diode targets, and a pipe-lined architecture of analog and digital electronics are used to locate multiple targets whose number is only limited by available computer memory. Data collection rates are a function of the laser scan rotation speed and are currently selectable up to 480 Hz. The tested performance on a preliminary prototype designed for 0.1 in accuracy (for tracking human motion) at a 480 Hz data rate includes a worst case resolution of 0.8 mm (0.03 inches), a repeatability of plus or minus 0.635 mm (plus or minus 0.025 inches), and an absolute accuracy of plus or minus 2.0 mm (plus or minus 0.08 inches) within an eight cubic meter volume with all results applicable at the 95 percent level of confidence along each coordinate region. The full six degrees of freedom of a body can be computed by attaching three or more target detectors to the body of interest

Statistical mechanics of a Feshbach coupled Bose-Fermi gas in an optical lattice

We consider an atomic Fermi gas confined in a uniform optical lattice potential, where the atoms can pair into molecules via a magnetic field controlled narrow Feshbach resonance. The phase diagram of the resulting atom-molecule mixture in chemical and thermal equilibrium is determined numerically in the absence of interactions under the constraint of particle conservation. In the limiting cases of vanishing or large lattice depth we derive simple analytical results for important thermodynamic quantities. One such quantity is the dissociation energy, defined as the detuning of the molecular energy spectrum with respect to the atomic one for which half of the atoms have been converted into dimers. Importantly we find that the dissociation energy has a non-monotonic dependence on lattice depth.Comment: 9 pages, 5 figure

Analysis of change in discrete variables

Versucht wird, eine Annäherung an die Analyse der Veränderung von diskreten Variablen zu leisten. Als methodisches Modell wird die Marcov-Kette benutzt, die einen brauchbaren Rahmen für die Analyse abgibt und in Zusammenhang mit ereignisgeschichtlichen Daten die Veränderungsraten bestimmbar macht. Kritik an der Brauchbarkeit der Marcov-Kette wird vom Autor zurückgewiesen. Er zeigt, daß dieses Modell auch den ad hoc statistischen Techniken Überlegen ist, weil diese ereignisgeschichtliche Daten von Veränderung nicht adäquat in die Bestimmung von historischen Veränderungen einbeziehen. Und gerade ereignisgeschichtliche Daten erlauben die direkte Analyse von Veränderungen, und deshalb ist hier ein entsprechendes methodisches Modell notwendig. (BG

Early intensive behavioral intervention for autism: Is it actually more intensive than a typical child\u27s day?

Autism Spectrum Disorder (ASD) is a pervasive developmental disorder characterized by deficits in social interaction, communication, and excessive ritualistic and repetitive behavior. Numerous treatments for autism devised over the last half-century have proven ineffective, or have never been scientifically evaluated. Despite the state of the research, the most demonstrably effective treatment, Early Intensive Behavioral Intervention (EIBI), has been a target of much criticism, including accusations of being too intense. A large number of learning trials in relatively short periods of time supposedly induce children to have disordered stress responses. To explore the intensity of EIBI, behavior samples from children engaging in EIBI and typical children engaging in everyday activities were gathered and coded for rates of behavior. Operational definitions of what constituted a single behavioral interaction were developed, and those samples were used to calculate behavior rates. The results suggest that the rate of behavior exhibited by typical children exceeds the rate of behaviors in early intensive behavioral therapy, by a factor of two to three. Simply put, EIBI is generally not nearly as behaviorally intense as are ordinary child activities, and thus this dimension of EIBI is unlikely to be a precipitant for disordered stress responses

Group Psychotherapy: A Review of Literature

Group psychotherapy has been described as uniquely American. It is indeed a consequence of the pragmatism of American psychiatry, which appeared willing to explore any new and possibly helpful technique

Space Station Freedom delta pressure leakage rate comparison test data analysis report

Results are provided of a series of tests performed to identify the relationship between gas leakage rates across a seal at various internal to external pressure ratios. The results complement and provide insight into the analysis technique used to obtain the results presented in MSFC SSF/DEV/EL91-008, 'Space Station Freedom (S.S. Freedom) Seal Flaw Study with Delta Pressure Leak Rate Comparison Test Report.

Information transfer through a one-atom micromaser

We consider a realistic model for the one-atom micromaser consisting of a cavity maintained in a steady state by the streaming of two-level Rydberg atoms passing one at a time through it. We show that it is possible to monitor the robust entanglement generated between two successive experimental atoms passing through the cavity by the control decoherence parameters. We calculate the entanglement of formation of the joint two-atom state as a function of the micromaser pump parameter. We find that this is in direct correspondence with the difference of the Shannon entropy of the cavity photons before and after the passage of the atoms for a reasonable range of dissipation parameters. It is thus possible to demonstrate information transfer between the cavity and the atoms through this set-up.Comment: Revtex, 5 pages, 2 encapsulated ps figures; added discussion on information transfer in relation with cavity photon statistics; typos corrected; Accepted for Publicaiton in Europhysics Letter