Results 101 to 110 of about 368,356 (303)

Convolutional Neural Networks Approach for Solar Reconstruction in SCAO Configurations

Sensors, 2019
Correcting atmospheric turbulence effects in light with Adaptive Optics is necessary, since it produces aberrations in the wavefront of astronomical objects observed with telescopes from Earth.
Sergio Luis Suárez Gómez, Carlos González-Gutiérrez, Francisco García Riesgo, Maria Luisa Sánchez Rodríguez, Francisco Javier Iglesias Rodríguez, Jesús Daniel Santos   +5 more
doaj   +1 more source

Field‐Free, Deterministic Giant Spin‐Orbit Torque Switching of 1.3 T Perpendicular Magnetization With Symmetry‐Lifted Topological Surface States

Advanced Materials, EarlyView.
We show a giant, bias‐field free, deterministic, spin‐orbit‐torque switching of perpendicular hard magnets with HC over 1.3 T. By combining the three‐fold 3m symmetry from topological insulator surface states with the rectangular mm2 symmetry from the 2 x 1 intercalation in Cr3Te4, the interface symmetry is significantly reduced into a unidirectional m
He Ren, Yawen Peng, Meixin Cheng, Yu Shi, Reza Asadi, Adam W. Tsen, Guo‐Xing Miao   +6 more
wiley   +1 more source

Commissioning ShARCS: the Shane Adaptive optics infraRed Camera-Spectrograph for the Lick Observatory 3-m telescope

, 2014
We describe the design and first-light early science performance of the Shane Adaptive optics infraRed Camera-Spectrograph (ShARCS) on Lick Observatory's 3-m Shane telescope. Designed to work with the new ShaneAO adaptive optics system, ShARCS is capable
Alcott, Barry, Cowley, David, Deich, William, Dillon, Daren, Gates, Elinor, Gates, John, Gavel, Donald, Kupke, Renate, Lanclos, Kyle, McGurk, Rosalie, Norton, Andrew, Peck, Michael, Pfister, Terry, Rockosi, Constance, Sandford, Dale, Saylor, Mike, Srinath, Srikar, Ward, Jim, Weiss, Jason   +18 more
core   +1 more source

Emergent Freestanding Complex Oxide Membranes for Multifunctional Applications

Advanced Materials, EarlyView.
This review surveys freestanding oxide membranes and covers fabrication and three pathways for studies and devices: strain‐free and strained membranes, and van der Waals‐integrated heterostructures. We show how coupled oxide responses map onto these routes and cross‐couple to expand behaviors.
Baowen Li, Yanran Liu, Jinjin Liu, Josephine Si Yu See, Kaijian Xing, Dong‐Chen Qi, Xiao Renshaw Wang   +6 more
wiley   +1 more source

A census of $\rho$ Oph candidate members from Gaia DR2

, 2019
The Ophiuchus cloud complex is one of the best laboratories to study the earlier stages of the stellar and protoplanetary disc evolution. The wealth of accurate astrometric measurements contained in the Gaia Data Release 2 can be used to update the ...
Bombrun, A., Cantero, C., Cieza, L., Cánovas, H., Lammers, U., Merín, B., Mora, A., Ribas, Á., Ruíz-Rodríguez, D.   +8 more
core   +1 more source

Automatic Compressive Sensing of Shack–Hartmann Sensors Based on the Vision Transformer

Photonics
Shack–Hartmann wavefront sensors (SHWFSs) are crucial for detecting distortions in adaptive optics systems, but the accuracy of wavefront reconstruction is often hampered by low guide star brightness or strong atmospheric turbulence.
Qingyang Zhang, Heng Zuo, Xiangqun Cui, Xiangyan Yuan, Tianzhu Hu   +4 more
doaj   +1 more source

Observational evidence for enhanced magnetic activity of superflare stars

Nature Communications, 2016
Superflares are large explosive events on stellar surfaces, much larger than solar flares, but it remains unclear whether they share the same origin. Here, the authors analysed 48 superflare stars and determine the relation between their chromospheric ...
Christoffer Karoff, Mads Faurschou Knudsen, Peter De Cat, Alfio Bonanno, Alexandra Fogtmann-Schulz, Jianning Fu, Antonio Frasca, Fadil Inceoglu, Jesper Olsen, Yong Zhang, Yonghui Hou, Yuefei Wang, Jianrong Shi, Wei Zhang   +13 more
doaj   +1 more source

End-to-end simulations of photonic phase correctors for adaptive optics systems. [PDF]

Optics Express
Optical beams and starlight distorted by atmospheric turbulence can be corrected with adaptive optics systems to enable efficient coupling into single-mode fibers.
Dhwanil Patel, M. Diab, R. Cheriton, Jacob Taylor, Libertad Rojas, M. Vachon, Dan-Xia Xu, J. Schmid, P. Cheben, Siegfried Janz, Suresh Sivanandam   +10 more
semanticscholar   +1 more source

Atomically Resolved Acoustic Dynamics Coupled with Magnetic Order in a Van der Waals Antiferromagnet

Advanced Materials, EarlyView.
Magnetically coupled acoustic phonon modes (f1, f2, f3) are captured by ultrafast X‐ray diffraction in a prototypical van der Waals antiferromagnet FePS3, including their atomic displacement vectors (u) and the acoustic propagation wave vectors (k). Notably, the atomic displacement vector and amplitude of these modes, represented by the direction and ...
Faran Zhou, Kyle Hwangbo, Sung Soo Ha, Xiao‐Wei Zhang, Sae Hwan Chun, Jaeku Park, Intae Eom, Qianni Jiang, Zekai Yang, Marc Zajac, Sungwon Kim, Sungwook Choi, Zhaodong Chu, Kyoung Hun Oh, Yifan Su, Alfred Zong, Elton J. G. Santos, Ting Cao, Jiun‐Haw Chu, Stephan O. Hruszkewycz, Nuh Gedik, Di Xiao, Hyunjung Kim, Xiaodong Xu, Haidan Wen   +24 more
wiley   +1 more source

Astronomical spectrograph calibration with broad-spectrum frequency combs

, 2008
Broadband femtosecond-laser frequency combs are filtered to spectrographically resolvable frequency-mode spacing, and the limitations of using cavities for spectral filtering are considered. Data and theory are used to show implications to spectrographic
26, 380, Abedin, Bartels, Bartels, Ciddor, D. A. Braje, DeVoe, Dudley, Fortier, Fortier, Hall, Hansch, Jones, Kumar, Li, M. S. Kirchner, Marcy, McFerran, Meyer, Nicholson, Pal, Ranka, S. A. Diddams, S. Osterman, Schliesser, Sizer, Stone, T. Fortier, Tauser, Udem, Udem, Washburn, Yiannopoulos   +33 more
core   +1 more source