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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Neuromorphic computing for temporal scientific data classification
In this work, we apply a spiking neural network model and an associated memristive neuromorphic implementation to an application in classifying temporal scientific data. We demonstrate that the spiking neural network model achieves comparable results to a previously reported convolutional neural network model, with significantly fewer neurons and synapses required.
In Situ Visualization for the Large Scale Computing Initiative Milestone.
Abstract not provided.
Improved control of electron computer-generated holographic grating groove profiles using ion beam gas-assisted etching
In a transmission electron microscope, electrons are described by matter-waves with wavelengths five orders of magnitude smaller than optical electromagnetic waves. Analogous to optical holography, electron wavefronts can be shaped using nanoscale holographic gratings. Here we demonstrate a novel, scalable nanofabrication method for creating off-axis holographic gratings that demonstrate near ideal diffraction efficiencies for binary, sinusoidal, and blazed grating groove profiles. We show that this method can produce up to 50 µm diameter area gratings that diffract up to 68% of the transmitted electron wave into a desired diffraction order with less than 7% into any other order. Additionally, we find that the amount of inelastically scattered electrons from the material gratings remaining in the coherent diffraction orders from the gratings is negligible in the far field.
Crystalline materials for quantum computing: Semiconductor heterostructures and topological insulators exemplars
Abstract High-purity crystalline solid-state materials play an essential role in various technologies for quantum information processing, from qubits based on spins to topological states. New and improved crystalline materials emerge each year and continue to drive new results in experimental quantum science. This article summarizes the opportunities for a selected class of crystalline materials for qubit technologies based on spins and topological states and the challenges associated with their fabrication. We start by describing semiconductor heterostructures for spin qubits in gate-defined quantum dots and benchmark GaAs, Si, and Ge, the three platforms that demonstrated two-qubit logic. We then examine novel topologically nontrivial materials and structures that might be incorporated into superconducting devices to create topological qubits. We review topological insulator thin films and move onto topological crystalline materials, such as PbSnTe, and its integration with Josephson junctions. We discuss advances in novel and specialized fabrication and characterization techniques to enable these. We conclude by identifying the most promising directions where advances in these material systems will enable progress in qubit technology.
Annual Report on Institutional Computing Resources: Multi-scale Modeling of Green House Gas Emissions Performed on Institutional Computing Project HIGRADchem
Agreements to limit greenhouse gas emissions require scientifically valid methods for monitoring and validating anthropogenic emissions. The task of monitoring CO 2 emissions is difficult because relatively small increases need to be detected against CO 2 's variable and large background concentrations. To ensure fair compliance everywhere on the globe, remotely sensed measurements and an understanding of the atmospheric transport of CO 2 from its sources are required. The climate treaty verification LDRD project addresses these challenges. The Remote Sensing Verification Project (RSVP) test2bed located in the Four Corners region of Arizona, Utah, Colorado, and New Mexico offers a unique opportunity to develop new approaches for estimating emissions of CO 2 . Two major power plants located in this area produce very large signals of co-emitted CO 2 and NO 2 in this rural region. In addition to the Environmental Protection Agency (EPA) maintaining Continuous Emissions Monitoring Systems (CEMS) on each of the power plant stacks, the RSVP program has deployed an array of in-situ and remote sensing instruments, which provide both point and integrated measurements.
High Performance Computing Facility Operational Assessment, 2013 Oak Ridge Leadership Computing Facility
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Reversible Computing as a Path Forward for Improving Dissipation-Delay Efficiency in Superconducting Computing.
Abstract not provided.
Reversible Computing as the Sustainable Path Forward for General Digital Computing.
Abstract not provided.
TChem ? An Open Source Computational Chemistry Software Library for Heterogeneous Computing Platforms.
Abstract not provided.
Using Computation Effectively for Scalable Poisson Tensor Factorization: Comparing Methods Beyond Computational Efficiency.
Abstract not provided.
Reversible Computing -- The Long-Term Future of General Digital Computing.
Abstract not provided.
Studying the Computational Performance of CSP Analysis on Heterogeneous Computing Platforms.
Abstract not provided.
Formulation and computation of partitioned schemes for coupled problems with non- conventional computational models.
Abstract not provided.