199 research outputs found

    Book review: India and the Islamic heartlands: an Eighteenth-Century world of circulation and exchange by Gagan D.S. Sood

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    Drawing on the chance discovery of a number of letters exchanged during the period, in India and the Islamic Heartlands: An Eighteenth-Century World of Circulation and Exchange author Gagan D.S. Sood attempts to capture the lives of ordinary people to reconstruct the connective tissues of a world lived beyond the purview of the sovereign. While the nature of the source material occasionally limits the book’s scope of analysis, this work successfully weaves together an insightful narrative to draw attention to a neglected arena and period, finds Mithilesh Kumar Jha

    Elastic properties of boron nitride nanotubes and their comparison with carbon nanotubes

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    Boron Nitride Nanotubes (BNNTs) have alternating boron and nitrogen atoms in graphite like network and are strongly polar in nature due to a large charge on boron and nitrogen atoms. Hence electrostatic interactions are expected to play an important role in determining the elastic properties of BNNTs. In the absence of specific partial atomic charge information for boron and nitrogen, we have studied the elastic properties BNNTs varying the partial atomic charges on boron and nitrogen. We have computed Young modulus (Y) and Shear modulus (G) of BNNT as a function of the tube radius and number of walls using molecular mechanics calculation. Our calculation shows that Young modulus of BNNTs increases with increase in magnitude of the partial atomic charge on B and N and can be larger than the Young modulus of CNTs of same radius. This is in contrast to the earlier finding that CNTs has the largest tensile strength (PRL, 80, 4502, 1998). Shear modulus, on the other hand depends weakly on the magnitude of partial atomic charge and is less than the shear modulus of the CNT. The values obtained for Young modulus and Shear modulus are in excellent agreement with the available experimental results

    Fall Prevention in Postacute Care: Best Practices Versus Documented Practices

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    Abstract Date Presented 3/31/2017 Falls are a quality measure under national value-based care initiatives. Thus, this session will present results from a mixed-methods study examining the alignment between best practices and rehabilitation patient documentation to inform future quality initiatives and documentation refinement. Primary Author and Speaker: Natalie Leland Contributing Authors: Carin Wong, Jenny Martinez, Brenda Fagan, Kate Wilber, Debra Saliba, Neeraj Sood</jats:p

    Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube suspensions

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    Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient, β0 ~ 250 cm/GW (650 cm/GW) and nonlinear index, γ ~ 15 cm2/pW (-30 cm2/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes

    Application of Compressed Sensing in Cognitive Radio

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