Results 121 to 130 of about 880,117 (356)
Analysis and control of pre-extinction dynamics in stochastic populations [PDF]
arXiv, 2014 We consider a stochastic population model where the intrinsic or demographic noise causes cycling between states before the population eventually goes extinct. A master equation approach coupled with a WKB (Wentzel-Kramers-Brillouin) approximation is used to construct the optimal path to extinction.
arxiv
Double Helical Plasmonic Antennas
Advanced Functional Materials, EarlyView.Plasmonic double helical antennas funnel circularly polarized light to the nanoscale, offering strong chiroptical interaction and directional light emission. Extending a single helix design tool, this study combines numerical modeling with experimental validation, revealing large, broadband dissymmetry factors in the visible range.
Aleksei Tsarapkin +7 more
wiley +1 more source
Serbian ritual lyrics of the spring and summer cycle [PDF]
Baština, 2012 Serbian ritual poetry is very old. There are some legacies from Middle Age. It is the most numerous subject of calendar cycles because of spring and summer rituals which are usually followed by singing.
Lazarević Velibor
doaj
The foreknowledge of extinction [PDF]
Postgraduate Medical Journal, 2009 We are, so far as we know, the first species that has foreseen its own extinction. In the distant past, this foreknowledge took the form of myths, including visions of Armageddon. In the last couple of centuries, however, we have been able to give precise scientific shape to such forebodings.
openaire +3 more sources
Advanced Healthcare Materials, EarlyView.Engineered exosome‐based heavy atom‐free nanosensitizers are developed for safe and targeted sono‐photodynamic therapy of solid tumors. The IR820‐TPE‐loaded, biotin‐conjugated exosomes (IR820‐TPE@B‐Exo) demonstrate significant promise for NIR fluorescence imaging‐guided sono‐photodynamic cancer therapy.
Van‐Nghia Nguyen +16 more
wiley +1 more source
Patterns of Monarch Site Occupancy and Dynamics in Iowa
Frontiers in Ecology and Evolution, 2019 The monarch butterfly (Danaus plexippus) is the focus of large-scale habitat restoration efforts because of recent population declines. From 2006-2017 we monitored monarchs at >400 sites throughout Iowa to link site occupancy and colonization ...
Stephen J. Dinsmore +4 more
doaj +1 more source
Continuous state branching processes in random environment: The Brownian case [PDF]
, 2016 We consider continuous state branching processes that are perturbed by a Brownian motion. These processes are constructed as the unique strong solution of a stochastic differential equation.
Palau, Sandra, Pardo, Juan Carlos
core
, 2004 We present values for angular diameter, flux and extinction for 70 Galactic planetary nebulae observed using narrow band filters. Angular diameters are derived using constant emissivity shell and photoionization line emission models.
A. A. Zijlstra +42 more
core +2 more sources
Designing for Degradation: Transient Devices Enabled by (Nano)Cellulose
Advanced Materials, EarlyView.Recent progress in transient devices enabled by (nano)cellulosic materials is reviewed. Transiency mechanisms, advantages of nanocelluloses, and a suite of applications are discussed. A circular thinking approach coupled with life cycle assessment is applied to critically revisit the potential, advantages, and challenges of nanocellulose‐enabled ...
Lucas J. Andrew +2 more
wiley +1 more source
Humanities, 2013 Human actions have altered global environments and reduced biodiversity by causing extinctions and reducing the population sizes of surviving species. Increasing human population size and per capita resource use will continue to have direct and indirect ...
Patrick L. Hindmarsh +2 more
doaj +1 more source