Results 81 to 90 of about 95,397 (283)

Data‐Driven Discovery of Quaternary Ammonium Interlayers for Efficient and Thermally Stable Perovskite Solar Cells

Advanced Materials, EarlyView.
An active learning framework, grounded in independently generated in‐house experimental data, enables reliable discovery of high‐performance interfacial materials for perovskite solar cells. Iterative model refinement autonomously converges toward structurally robust quaternary ammonium architectures, establishing a new design principle for interfacial
Jongbeom Kim, Yang Jeong Park, Chaehoon Jeon, Nahye Shin, Jaewang Park, Seungun Lee, Jino Im, Sungroh Yoon, Sang Il Seok   +8 more
wiley   +1 more source

Investigating Variations in Solar Differential Rotation by Helioseismology

The Astrophysical Journal
Helioseismic signatures of dynamo waves have recently been discovered in variations of the solar differential rotation, offering valuable insights into the type of dynamo mechanism operating in the solar convection zone. To characterize these variations,
Krishnendu Mandal, Alexander G. Kosovichev, Valery V. Pipin, Sylvain G. Korzennik   +3 more
doaj   +1 more source

Characteristics of the Solar Differential Rotation and Activity During Solar Cycle No. 24

Universe
An analysis of the solar differential rotation (DR) during solar cycle No. 24 (SC24) (2009–2019), based on the Kanzelhöhe Observatory for Solar and Environmental Research (KSO) data set, is presented.
Ivana Poljančić Beljan, Luka Šibenik, Klaudija Lončarić, Tomislav Jurkić, Rajka Jurdana-Šepić, Werner Pötzi, Damir Hržina, Roman Brajša, Astrid M. Veronig, Arnold Hanslmeier   +9 more
doaj   +1 more source

How Good a Clock is Rotation? The Stellar Rotation-Mass-Age Relationship for Old Field Stars

, 2013
The rotation-mass-age relationship offers a promising avenue for measuring the ages of field stars, assuming the attendant uncertainties to this technique can be well characterized.
Agüeros, Allain, Alphenaar, Andronov, Barkhatova, Barnes, Barnes, Barnes, Barnes, Basri, Basri, Beck, Bouvier, Brown, Chaplin, Claver, Courtney R. Epstein, Denissenkov, DeWarf, Durney, Glushkova, Gorshanov, Guenther, Gáspár, Hartman, Hartman, Hartman, Henderson, Herbst, Irwin, Janes, Jay, Jester, Jianke, Keppens, Kiraga, Kjeldsen, Krishnamurthi, Krishnamurthi, Lachaume, Lindoff, Luck, Lustig, Mamajek, Marc H. Pinsonneault, Matson, Meibom, Meibom, Meibom, Mermilliod, Meys, Morel, Neuforge-Verheecke, Perryman, Perryman, Pinsonneault, Pinsonneault, Rebull, Reiners, Sanders, Schou, Schwarzenberg-Czerny, Sills, Spada, Stepien, Söderhjelm, Tinker, van Altena, van Leeuwen, van Leeuwen, van Saders, Wright   +71 more
core   +1 more source

Activating a Metallization Switch for Record Hydrogen Evolution in Single‐Atom Modified Polar MOF Piezocatalysts

Advanced Materials, EarlyView.
ABSTRACT Piezocatalytic hydrogen evolution enables the conversion of mechanical energy into chemical fuels, but its efficiency is constrained by a trade‐off between piezoelectric polarization and electronic conductivity. Strong piezoelectric polarization is essential for sufficient driving force, yet highly polar materials typically suffer from poor ...
Chongyan Hao, Xinwei Guan, Yang Wu, Lingfeng Zhu, Yiwen Mai, Thomas Frauenheim, Zhenping Fu, Yalin Lu, Shidong Wang, Hanxing Liu, Hua Hao, Shujun Zhang, Zhenxiang Cheng, Xiaoning Li   +13 more
wiley   +1 more source

Magnetic activity on the young Sun: A case study of EK Draconis

Astronomy & Astrophysics
Context. Young solar analog stars provide key insights into the early stages of stellar evolution, particularly in terms of magnetic activity and rotation.
Görgei A., Kriskovics L., Vida K., Seli B., Oláh K., Sági P., Bódi A., Järvinen S. P., Strassmeier K. G., Pál A., Kővári Zs.   +10 more
doaj   +1 more source

Solar surface rotation: N-S asymmetry and recent speed-up

, 2015
Context. The relation between solar surface rotation and sunspot activity still remains open. Sunspot activity has dramatically reduced in solar cycle 24 and several solar activity indices and flux measurements experienced unprecedentedly low levels ...
Mursula, K., Usoskin, I., Zhang, L.
core   +1 more source

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Leaftronics: Bio‐Fractal Scaffolds From Leaf Venation for Low‐Waste Electronics

Advanced Materials, EarlyView.
“Leaftronics” transforms naturally evolved leaf venation into quasi‐fractal scaffolds for sustainable electronics. Polymer‐infiltrated leaf skeletons can be used to fabricate ultra‐smooth, reflow‐ and thin‐film‐compatible decomposable substrates, while making the same lignocellulose networks conducting results in flexible transparent electrodes.
Rakesh Rajendran Nair, Hrisheekesh Thachoth Chandran, Karl Leo, Hans Kleemann   +3 more
wiley   +1 more source

Mean-field theory of differential rotation in density stratified turbulent convection

, 2018
A mean-field theory of differential rotation in a density stratified turbulent convection has been developed. This theory is based on a combined effect of the turbulent heat flux and anisotropy of turbulent convection on the Reynolds stress.
Kleeorin, N., Rogachevskii, I.
core   +1 more source