60,072 research outputs found

    The Contract for College

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    Rising college costs, combined with major policy changes in financial aid, have made college less affordable for today's generation of young people. The Contract for College would unify the existing three strands of federal financial aid--grants, loans and work-study--into a coherent, guaranteed financial aid package for students

    Citizens at the Center: A New Approach to Civic Engagement

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    Offers specific recommendations for giving citizens the tools they need to identify problems and develop solutions in their communities -- and warns against top-down solutions that require people to "plug into" existing programs or campaigns

    Computer program ETC improves computation of elastic transfer matrices of Legendre polynomials P/0/ and P/1/

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    Computer program ETC improves computation of elastic transfer matrices of Legendre polynomials P/0/ and P/1/. Rather than carrying out a double integration numerically, one of the integrations is accomplished analytically and the numerical integration need only be carried out over one variable

    Expanding the toolbox for nanoparticle trapping and spectroscopy with holographic optical tweezers

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    We have developed a workstation based on holographic tweezers to optically trap, move and characterize metal nanoparticles. Our advanced darkfield imaging system allows us to simultaneously image and take spectra of single trapped metal nanoparticles. We take advantage of the beamshaping abilities of the spatial light modulator and correct for aberrations of the trapping optics. We monitor the improvement of the optical trap with video-based nanoparticle tracking. Furthermore we theoretically assess the capabilities and limitations of video-based tracking for nanoparticle position detection, in particular with respect to acquisition frequencies below the corner frequency

    ETC - A Fortran 4 program for computing the multigroup P/0/ and P/1/ elastic transfer coefficients

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    Fortran 4 program for calculating multigroup elastic transfer coefficient

    Room temperature self-assembly of mixed nanoparticles into complex material systems and devices

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    The ability to manufacture nanomaterials with complex and structured composition using otherwise incompatible materials increasingly underpins the next generation of technologies. This is translating into growing efforts integrating a wider range of materials onto key technology platforms1 - in photonics, one such platform is silica, a passive, low loss and robust medium crucial for efficient optical transport2. Active functionalisation, either through added gain or nonlinearity, is mostly possible through the integration of active materials3, 4. The high temperatures used in manufacturing of silica waveguides, unfortunately, make it impossible to presently integrate many organic and inorganic species critical to achieving this extended functionality. Here, we demonstrate the fabrication of novel waveguides and devices made up of complex silica based materials using the self-assembly of nanoparticles. In particular, the room temperature fabrication of silica microwires integrated with organic dyes (Rhodamine B) and single photon emitting nanodiamonds is presented.Comment: Key words: nanotechnology, nanoparticles, self-assembly, quantum science, singel photon emitters, telecommunications, sensing, new materials, integration of incompatible materials, silica, glass, breakthrough scienc

    Trace-driven simulation for LoRaWan868 MHz propagation in an urban scenario

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