108,604 research outputs found

    National Health Insurance -- A Brief History of Reform Efforts in the U.S.

    Get PDF
    Provides an overview of efforts toward and support for national health reform in the 1900s, including the proposals' origins, main reform elements, economic and political contexts, and reasons why they failed to achieve universal coverage

    Oral History: William Iannello

    Full text link
    Research paper devoted to the life of my grandfather, William Iannello, a second-generation Italian American. His parents came to the United States during the first decade of the 1900s from Calabria, the southernmost region of the Italian mainland

    An Early Black Cemetery on York Street

    Full text link
    Many are familiar with William H. Tipton, a well-known local photographer who recorded iconic views of the town, battlefield, and monuments surrounding Gettysburg. What many people may not know is that Tipton built a house in the early 1900s right on top of Gettysburg’s first African-American cemetery. [excerpt

    The Virginia Monument’s Meaning in Memory

    Full text link
    In the early 1900s, many people began to advocate for Confederate monuments on the battlefield at Gettysburg. However, different motivations were present. Many Northerners saw Confederate monuments as a way to further unity, while Southerners instead used the monuments to preserve a separate identity. The Virginia Memorial is a clear case of this

    Bowdoin Orient v.33, no.1-30 (1903-1904)

    Get PDF
    https://digitalcommons.bowdoin.edu/bowdoinorient-1900s/1004/thumbnail.jp

    Bowdoin Orient v.36, no.1-30 (1906-1907)

    Get PDF
    https://digitalcommons.bowdoin.edu/bowdoinorient-1900s/1007/thumbnail.jp

    Laser-induced isotopic selectivity in the resonance ionization of Os

    Get PDF
    Isotope selective effects in resonance ionization mass spectrometry (RIMS) pose a potentially serious limitation to the application of this technique to the precise and reproducible measurement of isotope ratios. In order to identify some of the underlying causes of isotope selectivity in RIMS and to establish procedures for minimizing these effects, we investigated laser-induced isotope selectivity in the resonance ionization of Os. A single-color, one-photon resonant ionization scheme was used for several different transitions to produce Os photoions from a thermal atomization source. Variations in Os isotope ratios were studied as a function of laser parameters such as wavelength, bandwidth, power and polarization state. Isotope selectivity is strongly dependent on laser power and wavelength, even when the bandwidth of the laser radiation is much larger than the optical isotope shift. Variations in the ^(190)Os/^(188)Os ratio of ≈20% for a detuning of 0.8 cm^(−1) were observed on a transition with a small oscillator strength. Large even—odd isotope selectivity with a 13% depletion of ^(189)Os was observed on a ΔJ = +1 transition at low laser intensity; the odd mass Os isotopes are systematically depleted. For ΔJ = −1 and 0 transitions the isotope selectivity was reduced by polarization scrambling and for strongly saturating conditions. A technique employing the wavelength dependence of even—even isotope selectivity as an internal wavelength standard was developed to permit accurate and reproducible wavelength adjustment of the laser radiation. This technique provides control over laser-induced isotope selectivity for single-color ionization and enabled us to obtain reproducible measurements of ^(192)Os/^(188)Os and ^(189)Os/^(190)Os ratios in the saturation regime for a ΔJ = +1 transition with a precision of better than 0.5%. The application of this wavelength-tuning procedure should significantly improve the quality of RIMS isotope ratio data for many elements

    Bowdoin Orient v.35, no.1-30 (1905-1906)

    Get PDF
    https://digitalcommons.bowdoin.edu/bowdoinorient-1900s/1006/thumbnail.jp

    Bowdoin Orient v.31, no.1-30 (1901-1902)

    Get PDF
    https://digitalcommons.bowdoin.edu/bowdoinorient-1900s/1002/thumbnail.jp

    Bowdoin Orient v.32, no.1-30 (1902-1903)

    Get PDF
    https://digitalcommons.bowdoin.edu/bowdoinorient-1900s/1003/thumbnail.jp
    corecore