14,510 research outputs found

    Addition of a gamma ray spectrometer to the alpha scattering experiment as designed for the Surveyor mission

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    Gamma ray spectroscopy and alpha scattering techniques for compositional analysis of lunar and planetary surface

    Contributions to workload of rotational optical transformations

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    An investigation of visuomotor adaptation to optical rotation and optical inversion was conducted. Experiment 1 examined the visuomotor adaptability of subjects to an optically rotating visual world with a univariate repeated measures design. Experiment 1A tested one major prediction of a model of adaptation put forth by Welch who predicted that the aversive drive state that triggers adaptation would be habituated to fairly rapidly. Experiment 2 was conducted to investigate the role of motor activity in adaptation to optical rotation. Specifically, this experiment contrasted the reafference hypothesis and the proprioceptive change hypothesis. Experiment 3 examined the role of cognition, error-corrective feedback, and proprioceptive and/or reafferent feedback in visuomotor adaptation to optical inversion. Implications for research and implications for practice were suggested for all experiments

    Waveguide mode imaging and dispersion analysis with terahertz near-field microscopy

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    Propagation of terahertz waves in hollow metallic waveguides depends on the waveguide mode. Near-field scanning probe terahertz microscopy is applied to identify the mode structure and composition in dielectric-lined hollow metallic waveguides. Spatial profiles, relative amplitudes, and group velocities of three main waveguide modes are experimentally measured and matched to the HE11, HE12, and TE11 modes. The combination of near-field microscopy with terahertz time-resolved spectroscopy opens the possibility of waveguide mode characterization in the terahertz band

    Lattice QCD at finite temperature: Evidence for calorons from the eigenvectors of the Dirac operator

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    We analyze the eigenvalues and eigenvectors of the staggered Dirac operator in quenched lattice QCD in the vicinity of the deconfinement phase transition using the L\"uscher-Weisz gauge action. The spectral and localization properties of the low-lying eigenmodes show characteristic differences between the Z_3 sectors above the critical temperature T_c. These findings can be interpreted in terms of calorons.Comment: Lattice2001(hightemp), 3 pages, 2 figure

    Teaching at a Distance with the Merging Technologies: An Instructional Systems Approach

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    A review of Teaching at a Distance with the Merging Technologies: An Instructional Systems Approach, by Thomas E. Cyrs with Eugenia D. Conway
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