Results 71 to 80 of about 4,967 (311)

Unconventional Hysteretic Charge Filling in Moiré‐Reconstructed Helical Trilayer Graphene

Advanced Science, EarlyView.
In helical trilayer graphene, sequential twisting reconstructs the moiré landscape into periodic domains separated by aperiodic boundaries. Longitudinal transport reveals sweep‐direction‐dependent hysteresis, while the Hall response traces this behavior to hysteretic charge filling at the aperiodic boundaries.
Hangyeol Park, Junhyeok Oh, Rasoul Ghadimi, Chiranjit Mondal, Yungi Jeong, Won Beom Choi, Kenji Watanabe, Takashi Taniguchi, Bohm‐Jung Yang, Joonho Jang   +9 more
wiley   +1 more source

An Astronomical Observatory in the Classroom [PDF]

, 2006

We describe a project developed at the University of Granada in collaboration with the Instituto de Astrofísica de Andalucía aimed at using a remote telescope for live astronomical observations from the classroom. Available instrumentation, software and
T. Gallego, A. de la Torre, L. Lara
core   +1 more source

Optical Design of a Near-infrared Spectrograph Prototype for LAMOST

The Astronomical Journal
The Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) has demonstrated exceptional capability in optical spectroscopic surveys. To overcome its inherent limitations in observing late-type stars and regions of high extinction, we present ...
Xiaojie Zhang, Yonghui Hou, Jun Li, Haoran Yu, Hangxin Ji   +4 more
doaj   +1 more source

Machine‐Learning‐Enhanced Printed Vertical Magnetoresistive Sensors for Transparent, Flexible, Multimodal Interactive Magnetoelectronics

Advanced Science, EarlyView.
This study presents printed magnetoresistive sensors with a vertically aligned architecture that enables high optical transparency and mechanical flexibility. By integrating deep learning for the analysis of complex spatiotemporal signal patterns, the system further achieves intelligent multimodal interaction capabilities.
Rui Xu, Guannan Mu, Oleksandr V. Pylypovskyi, Qihao Zhang, Rico Illing, René Hübner, Ran He, Andreas Knüpfer, Sebastian Lehmann, Olha Bezsmertna, Kornelius Nielsch, Denys Makarov   +11 more
wiley   +1 more source

Optimizing Structural Parameters and Layout of Fiber Positioners with the Whale Optimization Algorithm for LAMOST

The Astronomical Journal
Robotic fiber positioner (RFP) arrays are essential for multiobject spectroscopic telescopes. To improve the survey efficiency, they are densely arranged on the focal planes with overlapped patrol areas, guaranteeing full coverage and increasing the ...
Zengxiang Zhou, Jiahao Zhou, Baolong Chen, Jianping Wang, Zhigang Liu, Hongzhuan Hu, Feifan Zhang   +6 more
doaj   +1 more source

Plaid‐Like Spin Splitting and Chirality of Magnon Bands in Antiferromagnetic MnTe2

Advanced Science, EarlyView.
Helicity‐ and angle‐resolved Raman spectroscopy reveals chiral magnons in the non‐coplanar antiferromagnet MnTe 2. Combined with first‐principles calculations and spin‐wave theory, the results establish its altermagnetic character through circular Raman dichroism, reduced rotational symmetry, and a distinctive plaid‐like momentum‐space magnon spin ...
Dirk Wulferding, Daehyeon An, Jiwon Choi, Dongmin Moon, Youngsu Choi, Sivasakthi Kuppusamy, Sritharan Krishnamoorthi, Raman Sankar, Myung Joon Han, Se Kwon Kim, Kwang‐Yong Choi   +10 more
wiley   +1 more source

The Evolution of Optical Instrumentation, Laser Technology, and Scientific Thought: the Ramon Maria Aller Astronomical Activities and Arab Astronomy [PDF]

, 2020
This Doctoral Dissertation was written by Hatem Abdullah Al-Ameryeen under the direction of José Ángel Docobo, Full Professor of Astronomy and Director of the Ramón María Aller Astronomical Observatory (OARMA) at the University of Santiago de ...
Abdullah Hamdan Al-Ameryeen, Hatem
core  

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope [PDF]

, 2019
We report on the extensively upgraded Cassegrain spectrograph on the South African Astronomical Observatory (SAAO) 1.9-m telescope. The introduction of new collimator and camera optics, a new detector and controller, a rear-of-slit viewing camera to ...
Crause, Lisa A., Kotze, Enrico J., Worters, Hannah L., Potter, Stephen, Gilbank, David, van Gend, Carel, Sass, Craig   +6 more
core   +1 more source

Structural Colors from Modulated Topological Defects in Molecular Smectic Liquid Crystals

Advanced Science, EarlyView.
Rather than using dyes and pigments, nature produces the colors of some butterflies and beetles through optical interference phenomena. This study describes an original biomimetic strategy exploiting the spontaneous formation of modulated linear defects in thin films of 8CB, a common molecular liquid crystal.
Camille N. Mahyaoui, Guilhem Poy, Rabab Zehra, Axel Fouques, Vassili Sergan, Ivan Dozov, Claire Meyer, Patrick Davidson   +7 more
wiley   +1 more source

On-sky Demonstration of Second-stage Wave-front Control with a Photonic Lantern

The Astronomical Journal
Ground-based direct imaging of exoplanets at high contrast requires precise correction of atmospheric turbulence using adaptive optics (AO). The planet-to-star contrast ratio at small angular separations from the host star is often limited by non-common ...
Aditya R. Sengupta, Jordan Diaz, Matthew DeMartino, Rebecca Jensen-Clem, Sylvain Cetre, Elinor Gates, Kevin Bundy, Daren Dillon, Philip Hinz, Maïssa Salama, Nour Skaf, Olivier Guyon, Tara Crowe, Caleb Dobias, Stephen S. Eikenberry, Rodrigo Amezcua-Correa, Stephanos Yerolatsitis   +16 more
doaj   +1 more source