Results 41 to 50 of about 69,768 (308)

Removing Homocoupling Defects in Alkoxy/Alkyl‐PBTTT Enhances Polymer:Fullerene Co‐Crystal Formation and Stability

open access: yesAdvanced Functional Materials, EarlyView.
PBTTT‐OR‐R, a C14‐alkoxy/alkyl‐PBTTT polymer derivative, is of substantial interest for optoelectronics due to its specific fullerene intercalation behavior and enhanced charge‐transfer absorption. Comparing this polymer with (S) and without (O) homocoupling defects reveals that PBTTT‐OR‐R(O) forms stable co‐crystals with PC61BM, while PBTTT‐OR‐R(S ...
Zhen Liu   +14 more
wiley   +1 more source

Spatial Evolution of Energetic Electrons Affecting the Upper Atmosphere during the Last Two Solar Cycles

open access: yesAtmosphere, 2022
Future commercial, scientific, and other satellite missions require low-Earth-orbit (LEO) altitudes of 300–400 km for long-term successful space operations.
Alexei V. Dmitriev   +4 more
doaj   +1 more source

The solar oscillations spectrum and the solar cycle [PDF]

open access: yesSymposium - International Astronomical Union, 1988
During the summer seasons of the years 1977 to 1985 daily velocity measurements of solar global oscillations have been obtained using a resonant scattering spectrometer. After calculating the power spectra of the daily residuals, the mean for each season is found.
A. Jiménez   +7 more
openaire   +1 more source

Unique Performance Considerations for Printable Organic Semiconductor and Perovskite Radiation Detectors: Toward Consensus on Best Practice Evaluation

open access: yesAdvanced Functional Materials, EarlyView.
A lack of standard approaches for testing and reporting the performance of metal halide perovskites and organic semiconductor radiation detectors has resulted in inconsistent interpretation of performance parameters, impeding progress in the field. This Perspective recommends key metrics and experimental details, which are suggested for reporting in ...
Jessie A. Posar   +8 more
wiley   +1 more source

Ferrocene Derivatives Enable Ultrasensitive Perovskite Photodetectors with Enhanced Reverse Bias Stability

open access: yesAdvanced Functional Materials, EarlyView.
Novel ferrocene derivatives (e.g., FcPhc2) are used as an ultrathin layer hole‐blocking layer, reducing hole injection from the Ag contact. This results in an ultralow noise spectral density of 1.2 × 10−14 A Hz−1/2, and a high specific detectivity of 8.1 × 1012 Jones at −0.5 V.
Eunyoung Hong   +16 more
wiley   +1 more source

NONLINEAR PREDICTION OF SOLAR CYCLE 24 [PDF]

open access: yesThe Astrophysical Journal, 2009
Accepted by ...
Kilcik, A.   +5 more
openaire   +3 more sources

Solar Cycle 25 is Currently Very Similar to Solar Cycle 24

open access: yesResearch Notes of the AAS, 2021
Abstract Solar Cycle 25 started in 2019 December. Different predictions for its amplitude have been published so far without general consensus. We compared the evolution of Solar Cycle 25, using the first available values of the smoothed sunspot number, with past solar cycles.
V. M. S. Carrasco, J. M. Vaquero
openaire   +1 more source

Dual‐Mode Film Based on Highly Scattering Nanofibers and Upcycled Chips‐Bags for Year‐Round Thermal Management

open access: yesAdvanced Functional Materials, EarlyView.
Intelligent radiative cooling devices, adaptable to various weather conditions, have the potential for year‐round energy savings. This study introduces a sustainable dual‐mode film made from polycaprolactone nanofibers and upcycled chip bags for effective thermal management.
Qimeng Song   +4 more
wiley   +1 more source

Solar Cycle Signal in Climate and Artificial Neural Networks Forecasting

open access: yesRemote Sensing, 2022
Natural climate variability is partially attributed to solar radiative forcing. The purpose of this study is to contribute to a better understanding of the influence of solar variability on the Earth’s climate system.
Chris G. Tzanis   +2 more
doaj   +1 more source

Solar‐cycle variation of low density solar wind during more than three solar cycles [PDF]

open access: yesGeophysical Research Letters, 2000
The May, 1999 low density (<1 cm−3) solar wind interval is one of a series of intervals of low density solar wind which have been detected since in‐situ, near‐Earth observations began. Examining the NSSDC OMNI database since 1965, covering solar Cycles 20–23, we show that such intervals, which are also periods of unusually low mass flux and low ...
Richardson, I. G.   +3 more
openaire   +2 more sources

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