Results 41 to 50 of about 3,987,545 (371)

Lunar Laser Ranging Retroreflectors: Velocity Aberration and Diffraction Pattern

open access: yesThe Planetary Science Journal, 2023
The Lunar Laser Ranging (LLR) retroreflector arrays have been on the Moon for half a century. During that time, the laser range uncertainty has improved by a factor of 100. Consequently, the science results have also improved by orders of magnitude.
James G. Williams   +9 more
doaj   +1 more source

Minimum capture-recapture rates and years of banding station operations to obtain reliable adult annual survival estimates

open access: yesJournal of Field Ornithology, 2022
We examined variability in adult annual survival rate estimates for 33 breeding bird species, using 2011–2019 data from a 38-station Monitoring Avian Productivity and Survivorship (MAPS) program in Alberta, Canada.
Danielle R. Kaschube   +5 more
doaj  

Human habitats: prospects for infrastructure supporting astronomy from the Moon

open access: yesPhilosophical Transactions of the Royal Society A, 2020
There is strong interest in lunar exploration from governmental space agencies, private companies and the public. NASA is about to send humans to the lunar surface again within the next few years, and ESA has proposed the concept of the Moon Village ...
C. Heinicke, B. Foing
semanticscholar   +1 more source

Building Open Educational Resources from the Ground Up: South Africa's Free High School Science Texts

open access: yesJournal of Interactive Media in Education, 2008
The relatively new field of open educational resources (OER) is just now receiving more widespread attention and study. As such, there have been few opportunities thus far to share knowledge across program, organizational and national boundaries.
Lisa Petrides, Cynthia Jimes
doaj   +1 more source

THE PREVALENCE OF SELF-MEDICATION PRACTICE AMONG UNDERGRADUATE STUDENTS AT LIRA UNIVERSITY, LIRA DISTRICT. A CROSS-SECTIONAL STUDY.

open access: yesStudent's Journal of Health Research Africa, 2023
Background: The study aims to determine the prevalence of self-medication practice among undergraduate students, at Lira University, Lira district. Methodology: A cross-sectional study was conducted among undergraduate students, at Lira University.
Joan Onyum
doaj   +1 more source

Moon-moon Scattering and the Origin of Irregular and Runaway Moons [PDF]

open access: yes, 2012
Observations of the Solar system show that planetary satellites exist in various configurations; some have circular, co-planar orbits, and these are termed regular satellites. Other irregular satellites, have typically eccentric, inclined, and even retrograde orbits.
Hagai Perets, Maham Siddiqi
openaire   +1 more source

Developmental implications of prenatal opioid exposure among school-aged children: a mixed methods and community-initiated analysis

open access: yesBMC Public Health, 2023
Background Growing research points to potential long-term developmental implications of prenatal opioid exposure for children. Yet, polysubstance use and adverse childhood experiences are raised as potential confounders.
Andra Wilkinson   +2 more
doaj   +1 more source

Catching a planet: A tidal capture origin for the exomoon candidate Kepler 1625b I [PDF]

open access: yes, 2018
The (yet-to-be confirmed) discovery of a Neptune-sized moon around the ~3.2 Jupiter-mass planet in Kepler 1625 puts interesting constraints on the formation of the system.
Hamers, Adrian S.   +1 more
core   +3 more sources

An e-Learning Model for Teaching Mathematics on an Open Source Learning Platform

open access: yesInternational Review of Research in Open and Distributed Learning, 2018
Throughout the world, mathematics plays a vital role for the educational and developmental aspirations of any country. The quest to teach mathematical knowledge in a viable and effective way so as to induce creativity and applicability among learners is ...
Jeong Yong Ahn, Akugizibwe Edwin
doaj   +1 more source

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