Results 121 to 130 of about 2,140 (245)

The Ringed World: Saturn from Cassini to The James Webb Space Telescope. [PDF]

Nat Commun
Tiranti P.
europepmc   +1 more source

The role of composition in the spectral evolution of carbonaceous asteroids as informed by Bennu sample return

Meteoritics &Planetary Science, EarlyView.
Abstract Near‐Earth rubble‐pile asteroids Bennu and Ryugu are part of the carbonaceous taxonomic complex (C‐complex), and samples returned from both bodies resemble the most aqueously altered carbonaceous chondrites. However, telescopic and spacecraft visible–near infrared (VIS–NIR) reflectance spectra of Ryugu exhibit a red (positive) spectral slope ...
Ralph E. Milliken, Takahiro Hiroi, Victoria E. Hamilton, Cody D. Schultz, Ed A. Cloutis, Hannah H. Kaplan, Melissa K. Kontogiannis, Nathalia Vega‐Santiago, Dani N. DellaGiustina, Harold C. Connolly Jr., Dante S. Lauretta   +10 more
wiley   +1 more source

Satellite megaconstellations will threaten space-based astronomy. [PDF]

Nature
Borlaff AS, Marcum PM, Howell SB.
europepmc   +1 more source

Nanoscale space weathering features in mature lunar soil revealed by TEM and APT

Meteoritics &Planetary Science, EarlyView.
Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer, Alexander M. Kling, Luke Daly, Dieter Isheim, David N. Seidman, Michelle S. Thompson, Philipp R. Heck   +6 more
wiley   +1 more source

Low vision services in sub-Saharan Africa: a systematic review. [PDF]

Front Health Serv
Akuffo KO, Kyeremeh S, Agyekum S, Osei Duah Junior I, Ampong J, Okine M, Andoh AKA, Agbeshie GK, Boateng JA, Mensah NAO, Eisenbarth W.   +10 more
europepmc   +1 more source

The Development of a Low-Cost Fresnel Lens UV Telescope with SiPM Array for Low-Light Atmospheric Transient Detection. [PDF]

Sensors (Basel)
Chiritoi G, Popescu EM.
europepmc   +1 more source

Using Local Expert Knowledge to Measure Prices: Evidence From a Survey Experiment in Vietnam

Review of Development Economics, EarlyView.
ABSTRACT Many countries lack spatially disaggregated consumer price data needed to estimate real inequality and spatial patterns of poverty. Such data are especially absent in poor countries where weak infrastructure and high transport costs create large price variation over space.
John Gibson, Trinh Le
wiley   +1 more source

Compact Optical Visual Magnification System with a Wide Field of View. [PDF]

Sensors (Basel)
Milman U, Kaufmann J, Arieli Y.
europepmc   +1 more source

Bayesian Inference for Multivariate Monotone Densities

Scandinavian Journal of Statistics, EarlyView.
ABSTRACT We consider a nonparametric Bayesian approach to estimation and testing for a multivariate monotone density. Instead of following the conventional Bayesian approach of imposing a prior that satisfies the monotonicity restriction, we place a prior on the step heights via binning and a Dirichlet distribution. The resulting posterior distribution
Kang Wang, Subhashis Ghosal
wiley   +1 more source

Quantum interference of single photons without optical superposition: Toward high resolution imaging in spatial and spectral domains. [PDF]

Sci Adv
Zhang Y, Cui L, Guo X, Kang G, Zhao W, Deng Q, Tang X, Li X, Li C, Ou ZY.   +9 more
europepmc   +1 more source