Results 111 to 120 of about 53,027 (281)

Changes in Mammalian Body Length over 175 Years - Adaptations to a Fragmented Landscape?

Ecology and Society, 2003
The potential consequences of anthropogenic habitat fragmentation on species diversity and extinction have drawn considerable attention in recent decades.
Niels Martin Schmidt, Per Moestrup Jensen   +1 more
doaj   +1 more source

Variations Of The Selective Extinction Across The Galactic Bulge --- Implications For The Galactic Bar

, 2007
We propose a new method to investigate the coefficient of the selective extinction, based on two band photometry. This method uses red clump stars as a means to construct the reddening curve.
Wo'zniak Warsaw, K. Z. Stanek, P. R. Wo'zniak   +2 more
core  

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Thickness‐Dependent Infrared Emissivity of Ultrathin Freestanding MoSiN Nanocomposite Membranes

Advanced Optical Materials, EarlyView.
ABSTRACT Metals and dielectrics show opposite trends in thickness‐dependent infrared emissivity: metallic films exhibit a rise in emissivity below a critical thickness, while dielectric films show a corresponding decline. For applications demanding both high emissivity and mechanical strength in membranes with nanoscale thickness, combining these ...
Reethu Sebastian, Amrid Amnache, Nadi Braidy, Luc G. Fréchette   +3 more
wiley   +1 more source

The Milky Way as Seen by Classical Cepheids. I. Distances Based on Mid-infrared Photometry

The Astrophysical Journal Supplement Series
Classical Cepheids are the archetype of the standard candle, thanks to the period–luminosity relation, which allows us to measure their intrinsic brightness.
Dorota M. Skowron, Ronald Drimmel, Shourya Khanna, Alessandro Spagna, Eloisa Poggio, Pau Ramos   +5 more
doaj   +1 more source

The influence of partial closure for the populations to a non-selective harvesting Lotka–Volterra discrete amensalism model

Advances in Difference Equations, 2019
In this paper, a non-selective harvesting Lotka–Volterra amensalism discrete model incorporating partial closure for the populations is proposed and studied.
Qianqian Su, Fengde Chen
doaj   +1 more source

Mitigating Efficiency Roll‐Off in Phosphor‐Sensitized Fluorescence OLEDs via Molecular Polarity‐Based Benzofuropyridine Host Engineering

Advanced Optical Materials, EarlyView.
Positional isomerism in dibenzofuran‐based n‐type hosts modulates molecular polarity, charge‐transport balance, and emissive‐layer packing. The higher‐polarity BFPDB‐2 host facilitates efficient energy funneling, reduced aggregation, and preferential dipole orientation, leading to phosphor‐sensitized fluorescence OLEDs with enhanced external quantum ...
Nargis Ali, Xuyao Song, Yun‐Hi Kim, Min Chul Suh   +3 more
wiley   +1 more source

Polarization and the ratio of total-to-selective extinction

The Astronomical Journal, 1988
Relationships between extinction and polarization parameters are explored using ultraviolet (ANS and IUE), visual, and infrared data along the same lines of sight. In particular, the well-known empirical relationship between polarization and extinction, p less than or equal to 9.0E(B - V), has been reexamined using lines of sight for which R(V), the ...
Geoffrey C. Clayton, Jason A. Cardelli
openaire   +1 more source

Chip‐Integrated Metasurface‐GaAsSb Nanowire Array Photodetectors for Single‐Pixel Polarimetric Imaging

Advanced Optical Materials, EarlyView.
A 2×2 multiplexed GaAsSb nanowire photodetector array integrated with L‐shaped metasurfaces is developed for miniaturized infrared polarimetry. Leveraging non‐radiating anapole states that facilitate near‐field enhancement, the device demonstrates strong polarization selectivity at 835 nm.
Longsibo Huang, Ziyuan Li, Yitao Yang, Yang Yu, Lei Xu, Li Li, Songqin Zhang, Han Wang, Wenwu Pan, Chaohao Chen, Weiqi Jin, Wen Lei, Lorenzo Faraone, Chennupati Jagadish, Lan Fu   +14 more
wiley   +1 more source

Waveguide Geometry–Driven Trade‐Offs in Resonant Cavity Sensor Performance

Advanced Optical Materials, EarlyView.
Waveguide geometry governs the interplay between sensitivity, intrinsic Q‐factor, and wavelength noise in silicon nitride resonant sensors. Contrary to intuition, higher sensitivity does not ensure superior performance. Low‐noise, high‐Q ridge resonators achieve the lowest detection limits, revealing that detection is ultimately constrained by noise ...
Mohammad Talebi Khoshmehr, Bakiye Imran Akca, Mateusz Słowikowski, Drecka Dagmara, Marcin Juchniewicz, Ryszard Piramidowicz, Muhammad Ali Butt   +6 more
wiley   +1 more source