Results 121 to 130 of about 997,592 (241)

Shedding light on the environmental efficiency of the public light service: minimising light pollution through the global Malmquist–Luenberger index

open access: yesInternational Transactions in Operational Research, Volume 34, Issue 1, Page 528-551, January 2027.
Abstract The search for evidence in public management and the implementation of good management by public bodies is becoming increasingly important, and the principles of effectiveness and efficiency should be reinforced. Therefore, this paper aims to analyse the change in efficiency in the provision of public lighting services by local governments ...
Pablo Povedano‐Fernández   +2 more
wiley   +1 more source

TDLight: A Framework for Incremental Light-curve Management and Continuous Classification Optimization

open access: yesThe Astrophysical Journal Supplement Series
Time-series observations of celestial objects are fundamental to studying variable and transient phenomena. As time-domain surveys continue to scale up, timely automated classification is essential for rapid follow-up.
Xinghang Yu   +4 more
doaj   +1 more source

Mathematics and explanation in astronomy and astrophysics [PDF]

open access: yes, 2007
The purpose of this paper is to expound and clarify the mathematics and explanations commonly employed in certain notable areas of astronomy and astrophysics.
McCabe, Gordon, Gordon Mccabe
core  

Building a Continental‐Scale Geodetic Network: The Plate Boundary Observatory (PBO)

open access: yesPerspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract The Plate Boundary Observatory (PBO) transformed the use of geodesy in North America to study crustal deformation and plate boundary processes by establishing a continental‐scale, standardized, open‐access geodetic network. Built and operated by UNAVCO between 2003 and 2018 as part of the National Science Foundation (NSF)‐funded EarthScope ...
Emily E. Zawacki   +5 more
wiley   +1 more source

Nineteenth century astronomy at the US Naval Academy [PDF]

open access: yes, 2002
During the 1850s the newly-formed U.S. Naval Academy in Annapolis, Maryland, acquired a small observatory featuring a 19.7-cm (7.75-in.) Clark refractor, transit telescopes, and an astronomical clock.
Shankland, Paul D., Orchiston, Wayne
core   +1 more source

The Earth's Greatest Porous Media

open access: yesPerspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract How deeply does modern meteoric water circulate into the continental crust? How deep is the Earth's Critical Zone (CZ), the top layer of the continental lithosphere that co‐evolves with the atmosphere, hydrosphere, and biosphere, extending from vegetation canopy down to fresh bedrock and the base of active groundwater circulation?
Ying Fan   +3 more
wiley   +1 more source

A Minute-cadence Deep Bulge Survey: First Data Release of DREAMS

open access: yesThe Astrophysical Journal Supplement Series
The DECam Rogue Earths and Mars Survey (DREAMS), a NOIRLab survey program, has been conducting a 3 yr survey covering a 5 deg ^2 area in the Galactic bulge (roughly spanning $-1\mathop{.}\limits^{^\circ }2\lesssim \ell \lesssim +2\mathop{.}\limits ...
Hongjing Yang   +34 more
doaj   +1 more source

Astronomy Without a Telescope

open access: yes, 2001
Created by author Nick Strobel, "Astronomy Notes" is an educational resource for introductory astronomy classes for undergraduates. This section describes: the celestial sphere, coordinate systems, the motion of the stars.
Strobel, Nick
core  

GRAIN: Mapping the World's Irrigation Canals and Why It Matters for Water, Food, and Climate

open access: yesPerspectives of Earth and Space Scientists, Volume 7, Issue 1, December 2026.
Abstract The engineered channels that carry water from large dams and rivers to agricultural fields, known as irrigation canals, are the link between source (lakes and reservoirs) and sink (farmlands). These canals make cultivation of crops possible across millions of hectares of land.
Sarath Suresh   +3 more
wiley   +1 more source

A critical evaluation of the new Hall of Astronomy of the University of Mexico Science Museum

open access: yes, 2008
On December 2004, the newly designed astronomy hall at Universum, the science museum of the Universidad Nacional Autonoma de Mexico, was opened to the public.
Doddoli, Consuelo   +1 more
core  

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