Results 41 to 50 of about 191,844 (199)

Outcomes from the IYL2015 Quality Lighting Teaching Kit Program: Reaching for the Stars [PDF]

EPJ Web of Conferences, 2019
Poor quality lighting not only impedes astronomy research and our right to see a starry night sky, but creates safety issues, affects human circadian sensitivities, disrupts ecosystems, and wastes billions of dollars/year in energy consumption.
Walker Constance, Pompea Stephen
doaj   +1 more source

Sensitivity of CCD matrices with electronic multiplication

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2018
The sensitivity and basic electrical characteristics of the developed direct illumination matrices with charge-coupled devices and electronic multiplication were investigated at room temperatures and low illumination. Photomatrices of 576×288 and 640×512
F. F. Sizov, A. G. Golenkov, V. P. Reva, V. V. Zabudsky, S. V. Korinets, А. М. Torchinsky   +5 more
doaj   +1 more source

Artificial light at night is a top predictor of bird migration stopover density

Nature Communications, 2023
As billions of nocturnal avian migrants traverse North America, twice a year they must contend with landscape changes driven by natural and anthropogenic forces, including the rapid growth of the artificial glow of the night sky.
Kyle G. Horton, Jeffrey J. Buler, Sharolyn J. Anderson, Carolyn S. Burt, Amy C. Collins, Adriaan M. Dokter, Fengyi Guo, Daniel Sheldon, Monika Anna Tomaszewska, Geoffrey M. Henebry   +9 more
doaj   +1 more source

The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds [PDF]

Annales Geophysicae, 2005
An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78° N, 15° E) on 6 December 2002 from 07:30 UT to 13:30 UT when the solar zenith angle varied between 100.7° and 104°.
N. D. Lloyd, D. A. Degenstein, F. Sigernes, E. J. Llewellyn, D. A. Lorentzen   +4 more
doaj   +1 more source

Cloud coverage acts as an amplifier for ecological light pollution in urban ecosystems.

PLoS ONE, 2011
The diurnal cycle of light and dark is one of the strongest environmental factors for life on Earth. Many species in both terrestrial and aquatic ecosystems use the level of ambient light to regulate their metabolism, growth, and behavior.
Christopher C M Kyba, Thomas Ruhtz, Jürgen Fischer, Franz Hölker   +3 more
doaj   +1 more source

Dark roads aid movement but increase mortality of a generalist herbivore in the American Southwest

Ecosphere, 2023
Road networks pose many well‐documented threats to wildlife, from fragmenting habitats and restricting movement to causing mortality through vehicle collisions.
Kaitlyn M. Frank, Mark A. Ditmer, David C. Stoner, William S. Currie, Daniel D. Olson, Neil H. Carter   +5 more
doaj   +1 more source

High‐Efficiency Deep Blue Single‐Gaussian Europium(II) Emitters and Their Emitter‐Host Interactions

Advanced Functional Materials, EarlyView.
Crown‐ether ligands and carborate anions enable vacuum‐processable Eu(II) emitters with efficient single‐Gaussian deep‐blue luminescence. Combined photophysical and computational analyses reveal that excited‐electron confinement and steric shielding of the europium center jointly govern compatibility with OLED host materials, establishing molecular ...
Mahmoud Soleimani, Paulius Imbrasas, Jan‐Michael Mewes, Felix Kaden, Stephanie Anna Buchholtz, Karl Leo, Sebastian Schellhammer, Carsten Rothe, Sebastian Reineke   +8 more
wiley   +1 more source

Enhancement of Dissymmetry Factors Through Axial Elongation of Hetero[n]helicenes

Angewandte Chemie, EarlyView.
A benzofuran scaffolding strategy enables the synthesis of hetero[9]‐, [12]‐, and [15]helicenes. Structural and chiroptical analyses demonstrate that systematic axial elongation increases helical distortion and significantly amplifies luminescence dissymmetry.
Jeppe S. Mogensen, Christoffer Bræstrup, Christoffer Warming, Georg I. Junker, Yann Lie, Mathias Hermann, Kurt V. Mikkelsen, Michael Pittelkow   +7 more
wiley   +2 more sources

Optical Detection of Cellular Signals at Material Interfaces

Advanced Healthcare Materials, EarlyView.
Emerging functional materials are transforming optical detection of cellular signals. This review highlights optical techniques that exploit the unique optical properties of diverse materials to detect and quantify cellular electrical, chemical, and mechanical signals, and discusses key opportunities and challenges.
Xuchen Ren, Jitong Ren, Zixin Zhang, Koney Eungkon Kim, Francis L. Hong, Yuecheng Peter Zhou   +5 more
wiley   +1 more source

Selenophene π‐Core Fusion for Simultaneous Fast Reverse Intersystem Crossing and Narrowband Long‐Wavelength TADF

Angewandte Chemie, EarlyView.
Dibenzo[b,d]selenophene (DBSe) π‐core fusion enables rapid triplet–singlet interconversion while preserving the narrowband emission features of multi‐resonance thermally activated delayed fluorescence (MR‐TADF) luminogens. Combined with peripheral donor engineering, this strategy enables systematic emission tuning from green to red, leading to highly ...
Jingpeng Zhang, Jun Hyeon Lee, Guanting Liu, Tatsuya Mori, Takuma Yasuda   +4 more
wiley   +2 more sources