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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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Two-axis twisting using Floquet-engineered XYZ spin models with polar molecules
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Evaluation of Solar Reference Cells on a Two-Axis Tracker Using Spectral Measurements
A simple model calculating the performance of an IMT solar reference cell is proposed and tested under clear sky periods. One-minute data from EKO spectroradiometers collocated with an IMT reference cell are used for the analysis. Data are obtained at the NREL Solar Radiation Research Laboratory in Golden, Colorado and the UO Solar Radiation Monitoring Laboratory in Eugene, Oregon. The model is also applied and evaluated under cloudy conditions. A match of better than 1% is found between calculated clear sky values and IMT measurements for July, 2020. One- minute cloudy sky comparisons show a much larger variation, but when averaged over one hour, a standard deviation of 4% between the calculated and measured values is found.
Emodin ameliorates myocardial fibrosis in mice by inactivating the ROS/PI3K/Akt/mTOR axis
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NREL 15-kW: An Advanced Horizontal-Axis Reference Turbine for Distributed Wind
Distributed wind energy can play a significant role in the renewable energy landscape. A recent study conducted by the National Renewable Energy Laboratory (NREL) identified the lack of availability and utilization of reference wind turbine models as a major hindrance in the development of the distributed wind energy technology sector, even though such models are widely used in offshore and land-based wind research. Therefore, NREL is developing three reference wind turbine architectures, also called archetypes, for distributed wind energy applications. This paper describes the detailed design and modeling of the first of the three reference turbine archetypes, called the NREL 15-kW turbine. It is a passive-yaw, upwind turbine with a rated power of 15 kW.
Stability and Viability of Off-Axis Photoemission Geometries in 4D Ultrafast Electron Microscopy
Femtosecond (fs) laser-based 4D ultrafast electron microscopy (UEM) commonly makes use of photoelectron emission from a source material in the electron gun region of an otherwise conventional TEM. For TEMs equipped with thermionic guns, the source material is often LaB 6 , the same as used for thermionic operation. Here, such thermionic-based UEMs have proven useful for applications requiring large electron fluxes (i.e., high beam currents) often at the expense of beam coherence and brightness, which is especially important for single-shot nanosecond applications. Importantly, for fs-based UEMs, beam currents can be controlled over a broad range of parameter space through the properties of the fs laser and the photon pulses produced therefrom.
Measuring Single Atomic Defects in 2D Materials with Off-axis EELS Using Real-time AI-driven Detection
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Measurement of muon neutrino charged-current quasielasticlike cross section using off-axis NuMI beam at ICARUS
This paper presents the first neutrino cross-section measurement from the ICARUS detector at Fermilab, using Neutrinos at the Main Injector (NuMI) beam data collected from two beam operation periods corresponding to 2.5 × 10 20 protons-on-target in neutrino beam mode. The signal is defined by events with no pions produced in the final state, a topology dominated by charged-current quasielasticlike signatures. The measurement is reported as flux-averaged differential cross sections as functions of kinematic variables that provide sensitivity to the complex nuclear effects that often dominate the systematic uncertainty budgets of neutrino oscillation measurements. Specifically, this work reports cross sections in two angular variables—the angle of the outgoing lepton and the opening angle between the lepton and leading proton—and two variables characterizing the kinematic imbalance between the muon and proton in the plane transverse to the incoming neutrino. These results are compared against predictions from a variety of neutrino event generators, with p values calculated between the extracted cross sections and each prediction. Overall, the predictions agree with the data; however, the current budget of uncertainties does not yet provide sufficient discriminating power to favor a specific model.
Magnetic field induced softening of spin waves and hard-axis order in the Kondo-lattice ferromagnet CeAgSb 2
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Autocorrected off-axis holography of two-dimensional materials
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Subphases in the superconducting state of CeIrIn 5 revealed by low-temperature c -axis heat transport
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Revisiting the impact of dissipation on time-reversed one-axis-twist quantum-sensing protocols
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Determination of the Spin Axis in Quantum Spin Hall Insulator Candidate Monolayer WTe 2
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Ferroelectric C-Axis Textured Aluminum Scandium Nitride Thin Films of 100 nm Thickness
We report on the properties of Aluminum Scandium Nitride (AlScN) thin films deposited by pulsed-DC co-sputtering. We present the impact of the nitrogen-to-argon gas ratio on the crystal growth orientation, film stress, surface roughness, scandium concentration, and deposition rate of 760-860 nm thick AlScN thin films on Ti/Pt (111). We utilize the optimized process conditions from this study to deposit thin layers of AlScN and to explore the nucleation and orientation of thin AlScN layers on Ti/Pt (111). We report on the ferroelectric properties of 100 nm thick AlScN materials.