11 research outputs found

    The synthesis of 8-hydroxyellipticine and related compounds.

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    Automation and Integration of Hardware/Software Co-Verification Tool with Embedded Multi Processors System-On-Chip (MPSoC) Instrument Avionics for Next Generation Imagining Spectrometer (NGIS): On-Chip LiveCheckHSI

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    The emergent technology of System-on-Chip (SoC) and Multi processors System-on-Chip (MPSoC) devices promises lighter, smaller, cheaper, and more capable and reliable space electronic systems that could help to unveil some of the most treasured secrets in our universe. This technology is an improvement over the technology that is currently used in space applications, which lags behind state-of-the-art commercial-off-the-shelf (COTS) equipment by several generations. MPSoC technology integrates all computational power required by next-generation space exploration science instruments onto a single chip. This paper describes the automation and the integration of hardware/software co-verification tools (LiveCheckHSI) for the Xilinx Zynq-based SoC control and data handling avionics system that have been developed at the Jet Propulsion Laboratory (JPL) for next generation imaging spectrometers (NGIS). The NGIS acquires and compresses images in real-time, in addition to programming the spectrometer (frame rate, exposure time), focus step motor, and heaters and reporting telemetry. The SoC and MPSoC technologies combining heterogeneous supercomputing capability with high performance FPGAs allow for the integration of verification tools such as LiveCheckHSI into the deployment device itself. This approach allows to by-pass the traditional independent Ground Support Equipment (GSE) systems for acquisition, processing, and visualization of hyperspectral images which can be prohibitive in terms of hardware and software. This capability also permits on-chip verification for flight systems and extends embedded testing and verification tools beyond the pre-implementation formal verification and post-implementation such as VIVADO HardwareDebug / Chipscope with hardware in the loop. The first part of the paper describes the automation tools integrated into the remote LiveCheckHSI such as AutoSweep, Recording and Scripting capability. The second part of the paper describes the deployment of LiveCheckHSI into the MPSoC device itself using Yocto and Qt C++ framework

    Comparison of varied complexity models simulating recharge at the field scale

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    Numerical models are frequently used for the regional quantification of groundwater recharge. However there is a wide range of potential models available that represent the land surface with varying degrees of complexity, but which are rarely tested against observations at the field scale. We compared four models that simulate potential recharge at four intensively monitored sites with different vegetation and soil types in two adjacent catchments. These models were: Penman–Grindley, UN Food and Agricultural Organization, SPAtial Distributed Evaporation and Joint UK Land Environment Simulator. Standardized, unoptimized land surface datasets and pertinent literature were used for parameterization to reflect practice in regional water resource management and planning in the UK. The models were validated against soil moisture observations at all sites, as well as observed transpiration and interception and calculated total evaporation over a year at a woodland site. Soil moisture observations were generally reproduced well, but there were significant differences in how the models apportioned precipitation through the hydrological cycle. This demonstrates that soil moisture data alone are not a good diagnostic for groundwater recharge models. Significant differences in potential recharge were produced by models at both grassland sites, although simulated average annual potential recharge varied by only 15% at the grassland site on permeable soil. At the woodland sites, soil moisture contents were reproduced least accurately, and there were large differences in potential recharge at both woodland sites. This predominantly resulted from varied and inaccurate simulation of evaporation, particularly in the form of interception losses where this was explicitly represented in models. Differences in model structure, such as runoff representation, and parameter selection also influenced all results. Hydrological Processes © 2013 John Wiley & Sons, Ltd

    Thigh-length compression stockings and DVT after stroke

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    Controversy exists as to whether neoadjuvant chemotherapy improves survival in patients with invasive bladder cancer, despite randomised controlled trials of more than 3000 patients. We undertook a systematic review and meta-analysis to assess the effect of such treatment on survival in patients with this disease

    Improving the representation of hydrologic processes in Earth System Models

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