5941 research outputs found
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Facets of digital data dissemination: value addition through “imprints collection”
No full textRestricted accessPurpose – Facets of digital data dissemination, namely RRI Digital repository and Imprints collection, are two methods in which science communication can happen in the digital world. The purpose of this paper is to discuss the design, novelty and functionality of these facets as an archive, comprising a collage of profiles and publications of RRIians whose imprints on the sands of time have been culled and collated for posterity.
Design/methodology/approach – RRI Digital repository makes use of DSpace to preserve and showcase the research papers in text format, audio/video of lectures and images. Imprints collection is designed using Dreamweaver software. Images are uploaded using Jalbum.net software.
Findings – DSpace, an open source software meant for managing digital assets can be used as a platform to develop a modern genre of data dissemination. An example to this end is the Imprints collection, a bio-bibliographic database with many valuable additions showcasing the digital scholarship of an institute with archival value.
Practical implications – Practical implications of both RRI digital repository and imprints collection is to act as support service to enhance the creativity and collaboration among scientists of the institute within and across different research institutes in the country and across the world. Further, ResearcherID embedded in the profile pages of scientists helps scientometricians in citation analysis
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Originality/value – Novelty associated with imprints collection in science communication using DSpace data is the strength of this tool. This is a unique style of digital data dissemination with supporting links between authors, their persona, their papers, lectures and photographs
Optical phase noise engineering via acousto-optic interaction and its interferometric applications
No full textRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)Rapid and fine control over the phase of light is demonstrated by transferring digitally generated phase jumps from radio-frequency electrical signals onto light by means of acousto-optic interaction, and the underlying mechanism elucidated. This technique was used to engineer optical phase noise by tailoring the statistics of phase jumps in the electrical signal, which was then quantified using visibility measurements of the interference fringes. Such controlled dephasing finds applications in modern experiments involving the spread or diffusion of light in optical networks. In addition, the zero-delay intensity-intensity correlation [G2(0)] values of light emerging from different ports of a well-stabilized Mach–Zehnder interferometer in the presence of engineered partial phase noise are calculated, and it is shown analytically how the dark port of the interferometer nontrivially becomes a weak source of highly correlated or bunched photons
A 189 MHz, 2400 deg2 polarization survey with the Murchison wide field array 32-element prototype
No full textRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)We present a Stokes I, Q and U survey at 189 MHz with the Murchison Widefield Array 32 element prototype covering 2400 deg2. The survey has a 15.6 arcmin angular resolution and achieves a noise level of 15 mJy beam-1. We demonstrate a novel interferometric data analysis that involves calibration of drift scan data, integration through the co-addition of warped snapshot images, and deconvolution of the point-spread function through forward modeling. We present a point source catalog down to a flux limit of 4 Jy. We detect polarization from only one of the sources, PMN J0351-2744, at a level of 1.8% ± 0.4%, whereas the remaining sources have a polarization fraction below 2%. Compared to a reported average value of 7% at 1.4 GHz, the polarization fraction of compact sources significantly decreases at low frequencies. We find a wealth of diffuse polarized emission across a large area of the survey with a maximum peak of ~13 K, primarily with positive rotation measure values smaller than +10 rad m-2. The small values observed indicate that the emission is likely to have a local origin (closer than a few hundred parsecs). There is a large sky area at α >= 2h30m where the diffuse polarized emission rms is fainter than 1 K. Within this area of low Galactic polarization we characterize the foreground properties in a cold sky patch at (α, δ) = (4h, -27.°6) in terms of three-dimensional power spectra
System and method to drive display matrix
No full textOpen AccessA system and method to drive display matrix, comprising: a voltage level generator to provide predetermined voltages, a row voltage selector to select a group of voltages from the voltage level generator depending on select vector to drive row drivers, a column voltage selector to select a group of voltages from the voltage level generator depending on data vector to drive column drivers, and a controller to generate control signals to scan the display as dictated by addressing techniqu
Condensation and intermittency in an open boundary aggregation-fragmentation model.
No full textOpen AccessWe study real space condensation in aggregation-fragmentation models where the total mass is not conserved, as in phenomena such as cloud formation and intracellular trafficking. We study the scaling properties of the system with influx and outflux of mass at the boundaries using numerical simulations, supplemented by analytical results in the absence of fragmentation. The system is found to undergo a phase transition to an unusual condensate phase, characterized by strong intermittency and giant fluctuations of the total mass. A related phase transition also occurs for biased movement of large masses, but with some crucial differences which we highlight
Mechanical switch for state transfer in dual-cavity optomechanical systems
No full textOpen Access.Dual-cavity optoelectromechanical systems (OEMS) are those where two electromagnetic cavities are connected by a common mechanical spring. These systems have been shown to facilitate high-fidelity quantum-state transfer from one cavity to another. In this paper, we explicitly calculate the effect on the fidelity of state transfer when an additional spring is attached to only one of the cavities. Our quantitative estimates of loss of fidelity highlight the sensitivity of a dual-cavity OEMS when it couples to additional mechanical modes. We show that this sensitivity can be used to design an effective mechanical switch for inhibition or high-fidelity transmission of quantum states between the cavitie
