منابع مشابه
Determining the Grain Composition of the Interstellar Medium with High Resolution X-ray Spectroscopy
We investigate the ability of high resolution X-ray spectroscopy to directly probe the grain composition of the interstellar medium. Using iron K-edge experimental data of likely ISM dust candidates taken at the National Synchrotron Light Source at Brookhaven National Laboratory and the Advanced Photon Source at Argonne National Laboratory, we explore the prospects for determining the chemical ...
متن کاملMeasuring spatiotemporal variation in snow optical grain size under a subalpine forest canopy using contact spectroscopy
The distribution of forest cover exerts strong controls on the spatiotemporal distribution of snow accumulation and snowmelt. The physical processes that govern these controls are poorly understood given a lack of detailed measurements of snow states. In this study, we address one of many measurement gaps by using contact spectroscopy to measure snow optical grain size at high spatial resolutio...
متن کاملAngle resolved photoemission spectroscopy reveals spin charge separation in metallic MoSe2 grain boundary
Material line defects are one-dimensional structures but the search and proof of electron behaviour consistent with the reduced dimension of such defects has been so far unsuccessful. Here we show using angle resolved photoemission spectroscopy that twin-grain boundaries in the layered semiconductor MoSe2 exhibit parabolic metallic bands. The one-dimensional nature is evident from a charge dens...
متن کاملStudy of grain boundary polarization by two-probe and four-probe impedance spectroscopy
Four-probe impedance spectra of polycrystalline cation conductors: NASICON, Na b0-alumina and Ag b0-alumina, were measured in the frequency range from 10 Hz to 100 kHz with the aid of high sensitivity, high input impedance preamplifiers. Dispersion associated with the grain boundary polarization was observed below room temperature. The frequency dependent part of the conductivity of grain inter...
متن کاملPrediction of total phenols, condensed tannins, and 3-deoxyanthocyanidins insorghum grain using near-infrared (NIR) spectroscopy
The reported high phenolic levels in sorghum have led an interest from sorghum breeding programs in developing and identifying germplasms with high phenolic levels, which require screening a large number of samples to find those with the highest levels. Since wet chemistry screening methods are slow, expensive, and destructive, the use of NIR calibration curves could be an alternative. The obje...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1992
ISSN: 0074-1809
DOI: 10.1017/s0074180900089725