Results 91 to 100 of about 352,165 (301)

Three‐Dimensional Hierarchical Nanowire‐Networks with Deep‐Focus Tolerance and Adhesion Robustness for Harsh‐Environment SERS Sensing

Advanced Functional Materials, EarlyView.
A 3D nanowire‐network SERS substrate with robust adhesion is developed, featuring pronounced z‐direction optical activity, ultralow detection limit (1.5 × 10−13 M), and excellent signal uniformity (RSD < 10%). Enabled by enhanced light scattering, increased optical density of states, and structural reinforcement, the substrate demonstrates stable, high‐
Jinglai Duan, Wentao Wang, Xiu Liang, Yongliang Zhang, Jie Liu, Yu Bai, Dangyuan Lei   +6 more
wiley   +1 more source

Thin-disk laser scaling limit due to thermal-lens induced misalignment instability

, 2016
We present an obstacle in power scaling of thin-disk lasers related with self-driven growth of misalignment due to thermal lens effects. This self-driven growth arises from the changes of the optical phase difference at the disk caused by the excursion ...
Antognini, Aldo, Kirch, Klaus, Nez, Francois, Pohl, Randolf, Schuhmann, Karsten   +4 more
core   +1 more source

MAGTWIST: A Magnetically‐Driven Rotary Actuator Using a Traveling‐Wave With Integrated Stiffness Tunability

Advanced Functional Materials, EarlyView.
MAGTWIST: A compact magnetic rotary actuator, enabling smooth, stepless rotation, and on‐demand locking. Inspired by peristalsis, a soft polymer belt generates a traveling‐wave, enabling 270° rotation when heated. Cooling stiffens the belt, locking it in position and enabling it to withstand high loads.
Simon Frieler, Jean‐Paul P.M. de Vries, Sarthak Misra, Venkatasubramanian Kalpathy Venkiteswaran   +3 more
wiley   +1 more source

Dynamical axion misalignment from the Witten effect

Journal of High Energy Physics
We propose a relaxation mechanism for the initial misalignment angle of the pre-inflationary QCD axion with a large decay constant. The proposal addresses the challenges posed to the axion dark matter scenario by an overabundance of axions overclosing ...
Abhishek Banerjee, Manuel A. Buen-Abad
doaj   +1 more source

Evolution of Spin Direction of Accreting Magnetic Protostars and Spin-Orbit Misalignment in Exoplanetary Systems: II. Warped Discs

, 2010
Magnetic interactions between a protostar and its accretion disc tend to induce warping in the disc and produce secular changes in the stellar spin direction, so that the spin axis may not always be perpendicular to the disc.
Alencar, Aly, Aly, Bate, Bouvier, Bouvier, Chatterjee, Dong Lai, Eggleton, Fabrycky, Francois Foucart, Holman, Juric, Lai, Lai, Lai, Lin, Lodato, Long, Lovelace, Lubow, Lubow, Matt, McKee, Nagasawa, Ogilvie, Ogilvie, Papaloizou, Papaloizou, Papaloizou, Pfeiffer, Press, Pringle, Romanova, Schlaufman, Shakura, Shu, Terquem, Terquem, Triaud, Winn, Wu, Wu   +42 more
core   +1 more source

Rolling and Impacting Caustic Drops on Super Liquid‐Repellent Surfaces: In Situ Force and Energy Monitoring of Surface Degradation

Advanced Functional Materials, EarlyView.
The use of continuous drop‐based force and energy probing methods is introduced to evaluate in situ chemical degradation of super liquid‐repellent surfaces by caustic liquids. By tracking the velocity of rolling drops and energy dissipation of impacting drops, degradation dynamics are resolved under high spatio‐temporal precision. Using this technique,
Parham Koochak, Kai Liu, William S. Y. Wong   +2 more
wiley   +1 more source

Application of Federal Kalman Filter with Neural Networks in the Velocity and Attitude Matching of Transfer Alignment

Complexity, 2018
The centralized Kalman filter is always applied in the velocity and attitude matching of Transfer Alignment (TA). But the centralized Kalman has many disadvantages, such as large amount of calculation, poor real-time performance, and low reliability.
Lijun Song, Zhongxing Duan, Bo He, Zhe Li   +3 more
doaj   +1 more source

What limits supercurrents in high temperature superconductors? A microscopic model of cuprate grain boundaries

, 2009
The interface properties of high-temperature cuprate superconductors have been of interest for many years, and play an essential role in Josephson junctions, superconducting cables, and microwave electronics.
A Gurevich, B. M. Andersen, BM Andersen, BM Andersen, C-R Hu, D Dimos, FC Zhang, G Hammerl, H Hilgenkamp, ID Brown, J. Mannhart, JC Slater, JK Freericks, M Sigrist, M Sigrist, O Chmaissem, P Chaudhari, P Liu, P. J. Hirschfeld, R. Gutser, RC Baetzold, S Lee, S. Graser, SJ Pennycook, SR Phillpot, SV Stolbov, T Löfwander, T Yokoyama, T. Kopp, WA Harrison, X Zhang, Y Tanaka, Y Tanaka, Y Tanaka, YuS Barash   +34 more
core   +1 more source

Bio‐Inspired Magnetically Tunable Structural Colors from Elliptical Self‐Assembled Block Copolymer Microparticles

Advanced Functional Materials, EarlyView.
Cephalopod‐inspired photonic microparticles with dynamic structural coloration are fabricated via confined self‐assembly of linear block copolymers into ellipsoids containing stacked lamellae. Embedded superparamagnetic nanoparticles enable rapid magnetic alignment, restoring vivid, angle‐dependent color.
Gianluca Mazzotta, Simone Bertucci, Jose Mendoza‐Carreño, Agustín Mihi, Paola Lova, Davide Comoretto, Ullrich Steiner, Marco Lattuada, Andrea Dodero   +8 more
wiley   +1 more source

Jet Reorientation in Central Galaxies of Clusters and Groups: Insights from VLBA and Chandra Data

The Astrophysical Journal
Recent observations of galaxy clusters and groups with misalignments between their central active galactic nucleus jets and X-ray cavities, or with multiple misaligned cavities, have raised concerns about the jet–bubble connection in cooling cores, and ...
Francesco Ubertosi, Gerrit Schellenberger, Ewan O’Sullivan, Jan Vrtilek, Simona Giacintucci, Laurence P. David, William Forman, Myriam Gitti, Tiziana Venturi, Christine Jones, Fabrizio Brighenti   +10 more
doaj   +1 more source