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The mechanism for phonon scattering by nanostructures and by point defects in nanostructured silicon (Si) and the silicon germanium (Ge) alloy and their thermoelectric properties are investigated. We found that the thermal conductivity is reduced by a factor of 10 in nanostructured Si in comparison with bulk crystalline Si. However, nanosize interfaces are(More)
a continuous wave (cw) He±Cd laser (325 nm) with an output power of 20 mW was used as the excitation source. The PL was dispersed through a SPEX Triax 500 spectrometer with a 600 lines/mm grating and was detected by a nitrogen-cooled charge-coupled device (CCD) camera. The development of surfaces that have switchable properties offers a new dimension in the(More)
Citation Yang, J. et al. " Solubility study of Yb in n-type skutterudites Ybx Co4 Sb12 and their enhanced thermoelectric properties. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please(More)
The recent discovery of superconductivity with a transition temperature (T(c)) at 18 K in K(x)picene has extended the possibility of high-T(c) superconductors in organic materials. Previous experience based on similar hydrocarbons, like alkali-metal doped phenanthrene, suggested that even higher transition temperatures might be achieved in alkali-metals or(More)
Two full-length cDNAs (SGrca1 and SGrca2) encoding ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activase (RCA) were cloned from a heterophyllous aquatic plant, Sagittaria graminea, using Rapid-Amplification of cDNA Ends (RACE). SGrca1 contains a 1,320 bp open reading frame encoding a protein of 440 amino acids, and SGrca2 is exactly identical(More)
This research studied the usability problems of YAH maps in Westlake Scenery District. At first phase, using structured interview method, the usability problems of the maps in the District were investigated, and the amending advice were put forward according to the problems, and secondly, a performance comparison experiment was conducted to explore whether(More)
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