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793 results on '"Wilson, J. C"'

365. CORRESPONDENCE ON NEW ZEALAND AND CEYLON GOVERNMENT RAILWAYS.

Author

ABT, R, primary, ALFORD, R F, additional, BERGERON, C, additional, FISHER, G, additional, FOX, D M, additional, GOTTSCHALK, A, additional, MACDOUGALL, A, additional, MANNING, J R, additional, MORANDIERE, J, additional, RIGGENBACH, N, additional, ROBINSON, J, additional, ROWAN, A H, additional, SMYTHE, A J H, additional, WATSON, J W M, additional, WILSON, J C, additional, and SPOONER, C E, additional

Published
1881
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393. THE BEST METHODS OF TEACHING.: THE BEST METHOD TO TEACH PRACTICE OF MEDICINE.

Author

WILSON, J. C.

Abstract

The title of this communication has been selected by the Committee. The following method can not be regarded as "best" in any final sense, but as subject to alteration and modification according to circumstances. It is that employed in a medical school in which the speaker has the responsibility of arranging the details of the course in practice for large classes, and is the result of carefully considered progressive changes during a period of five years, starting with a systematic didactic course of three lectures a week and two general clinics a week. It is at present arranged for a three years' course. The four years' course to which it is now being adapted does not essentially modify the plan save in allowing the student more time for outside study and an increase in the number of hours devoted to actual clinical work.The groundwork in physiology, visceral anatomy and

Published
1896
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396. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs

Author

Wilson, J. C., Hearty, F. R., Skrutskie, M. F., Majewski, S. R., Holtzman, J. A., Eisenstein, D., Gunn, J., Blank, B., Henderson, C., Smee, S., Nelson, M., Nidever, D., Arns, J., Barkhouser, R., Barr, J., Beland, S., Bershady, M. A., Blanton, M. R., Brunner, S., Burton, A., Carey, L., Carr, M., Colque, J. P., Crane, J., Damke, G. J., Davidson, J. W., Dean, J., Di Mille, F., Don, K. W., Ebelke, G., Evans, M., Fitzgerald, G., Gillespie, B., Hall, M., Harding, A., Harding, P., Hammond, R., Hancock, D., Harrison, C., Hope, S., Horne, T., Karakla, J., Lam, C., Leger, F., MacDonald, N., Maseman, P., Matsunari, J., Melton, S., Mitcheltree, T., O'Brien, T., O'Connell, R. W., Patten, A., Richardson, W., Rieke, G., Rieke, M., Roman-Lopes, A., Schiavon, R. P., Sobeck, J. S., Stolberg, T., Stoll, R., Tembe, M., Trujillo, J. D., Uomoto, A., Vernieri, M., Walker, E., Weinberg, D. H., Young, E., Anthony-Brumfield, B., Bizyaev, D., Breslauer, B., Lee, N. De, Downey, J., Halverson, S., Huehnerhoff, J., Klaene, M., Leon, E., Long, D., Mahadevan, S., Malanushenko, E., Nguyen, D. C., Owen, R., Sánchez-Gallego, J. R., Sayres, C., Shane, N., Shectman, S. A., Shetrone, M., Skinner, D., Stauffer, F., and Zhao, B.

Abstract

We describe the design and performance of the near-infrared (1.51-1.70 ?m), fiber-fed, multi-object (300 fibers), high resolution (R= ?/??? 22,500) spectrograph built for the Apache Point Observatory Galactic Evolution Experiment (APOGEE). APOGEE is a survey of ?105red giant stars that systematically sampled all Milky Way populations (bulge, disk, and halo) to study the Galaxy's chemical and kinematical history. It was part of the Sloan Digital Sky Survey III (SDSS-III) from 2011 to 2014 using the 2.5 m Sloan Foundation Telescope at Apache Point Observatory, New Mexico. The APOGEE-2 survey is now using the spectrograph as part of SDSS-IV, as well as a second spectrograph, a close copy of the first, operating at the 2.5 m du Pont Telescope at Las Campanas Observatory in Chile. Although several fiber-fed, multi-object, high resolution spectrographs have been built for visual wavelength spectroscopy, the APOGEE spectrograph is one of the first such instruments built for observations in the near-infrared. The instrument's successful development was enabled by several key innovations, including a "gang connector" to allow simultaneous connections of 300 fibers; hermetically sealed feedthroughs to allow fibers to pass through the cryostat wall continuously; the first cryogenically deployed mosaic volume phase holographic grating; and a large refractive camera that includes mono-crystalline silicon and fused silica elements with diameters as large as ?400 mm. This paper contains a comprehensive description of all aspects of the instrument including the fiber system, optics and opto-mechanics, detector arrays, mechanics and cryogenics, instrument control, calibration system, optical performance and stability, lessons learned, and design changes for the second instrument.

Published
2019
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399. MAPPING THE INTERSTELLAR MEDIUM WITH NEAR-INFRARED DIFFUSE INTERSTELLAR BANDS.

Author

Zasowski, G., Ménard, B., Johnson, J. A., Wilson, J. C., Nidever, D. L., Shetrone, M., Bizyaev, D., Hayden, M. R., Holtzman, J., Kinemuchi, K., García-Hernández, D. A., Pérez, A. E. García, and Majewski, S. R.

Subjects
MILKY Way, INTERSTELLAR medium, INTERPLANETARY dust, NEAR infrared radiation, STELLAR spectra
Abstract

We map the distribution and properties of the Milky Way's interstellar medium as traced by diffuse interstellar bands (DIBs) detected in near-infrared stellar spectra from the SDSS-III/APOGEE survey. Focusing exclusively on the strongest DIB in the H band, at λ ∼ 1.527 μm, we present a projected map of the DIB absorption field in the Galactic plane, using a set of about 60,000 sightlines that reach up to 15 kpc from the Sun and probe up to 30 mag of visual extinction. The strength of this DIB is linearly correlated with dust reddening over three orders of magnitude in both DIB equivalent width (WDIB) and extinction, with a power law index of 1.01 ± 0.01, a mean relationship of WDIB/AV = 0.1 Å mag–1 and a dispersion of ∼0.05 Å mag–1 at extinctions characteristic of the Galactic midplane. These properties establish this DIB as a powerful, independent probe of dust extinction over a wide range of AV values. The subset of about 14,000 robustly detected DIB features have a WDIB distribution that follows an exponential trend. We empirically determine the intrinsic rest wavelength of this transition to be λ0 = 15 272.42 Å and use it to calculate absolute radial velocities of the carrier, which display the kinematical signature of the rotating Galactic disk. We probe the DIB carrier distribution in three dimensions and show that it can be characterized by an exponential disk model with a scale height of about 100 pc and a scale length of about 5 kpc. Finally, we show that the DIB distribution also traces large-scale Galactic structures, including the Galactic long bar and the warp of the outer disk. [ABSTRACT FROM AUTHOR]

Published
2015
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