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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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Poster with results from ongoing research on re-training pv-vision to segment images of solar modules. Presenting at the Sandia Analytics for Climate, Energy, and Earth Sciences (ACEES) 2025 Symposium.
Despite the extraordinary advances in solar cell efficiency in laboratory settings, the deployment of solar cells continues to be limited to low efficiency (<25%) silicon cells because of cost. In this work, we take advantage of the extraordinary optical properties afforded by nanophotonic structures to create a photonic luminescent solar concentrator for an InGaP-Si multijunction concentrator cell. Finite difference time domain (FDTD) simulations demonstrated a concentrator that could effectively capture, downconvert, and guide concentrated light to an InGaP subcell while still transmitting longer wavelengths to a Si subcell. We fabricated the photonic luminescent solar concentrator, which was comprised of CdSe/CdS quantum dots embedded within alternating layers of Si 3 N 4 and SiO 2 , and experimentally verified the optical performance, showing a 40% increase in light guiding and a significant reduction in reabsorption losses in the plane of the luminescent concentrator as compared to traditional designs. Finally, we utilized modified detailed balance calculations that accounted for cell and optical losses and showed >30% efficiencies are possible with this design, demonstrating the potential to meet the demands for high efficiency, inexpensive solar modules.
Cosmic ray conference - intensity and energy spectra of particles in primary cosmic radiation, solar modulation, and measurements using Cerenkov scintillation counter
Differential spectra of charge components of primary cosmic ray heavy nuclei at different solar modulation levels and effects of interstellar propagation
Intensity and spectra of cosmic ray electrons and positrons in determining mean confinement time, density and solar modulation
Source spectra and composition of galactic cosmic rays implied by analysis of interstellar and interplanetary travel, noting solar modulation
Differential energy spectrum of primary cosmic ray electrons measured on IMP 3 during minimum solar modulation for galactic radiation
Cosmic ray electron flux in 17-63 Mev energy range measured with altitude balloons, noting galactic cosmic ray electrons origin and solar modulation
Primary cosmic ray energy spectra and charge composition during 1965 solar modulation minimum, using scintillator photomultiplier detector on OGO 1
Cosmic ray differential energy spectrum and chemical abundance of elements from lithium to fluorine near minimum solar modulation measured by IMP 3
Long term variations of primary cosmic ray electron flux density from balloon-borne counter telescope data, noting absence of solar modulation
Cosmic ray Li, Be and B nuclei measurements, analyzing differential energy spectra, L-M ratio, atmospheric and solar modulation
Cosmic ray negatron and positron spectra using balloon-borne magnetic spectrometer, obtaining absolute solar modulation of positron flux
Cosmic ray electron energy spectrum and intensity measurements indicating time variations attributed to solar modulation effects
Differential energy spectra of cosmic ray negatrons and positrons, and solar modulation effects on cosmic ray electrons
Quiet time intensity increases and long term solar modulation of interplanetary low energy electrons, using IMP observations
Cosmic ray positrons and negatrons differential energy spectra and solar modulation, using balloon-borne magnetic spectrometer
Cosmic ray positrons and negatrons differential intensities near north geomagnetic pole from balloon flight measurements, noting solar modulation effects