Results 131 to 140 of about 140,683 (272)

A Synthetic Approach in Maghribi and Ottoman Astronomical Traditions: The Example of an 18thCentury Ottoman Perpetual Calendar for the Latitude of Algiers

Tarih Dergisi
The lack of a systematic examination of the potential interactions between astronomical and maritime techniques in the Maghribi and Ottoman traditions has hindered the resolution of many issues in the history of science.
Gaye Danışan
doaj   +1 more source

Ag Nanowire‐Integrated MoS2/ZnO Heterojunctions for Highly Efficient Photogenerated Charge Transfer

Advanced Electronic Materials, Volume 11, Issue 6, May 2025.
A versatile strategy is reported for fabricating multi‐dimensional heterojunctions with significantly improved charge transfer capability. By integrating Ag nanowires with a MoS2/ZnO heterojunction, a fourfold increase in surface photovoltage is achieved, reaching 200 mV under visible light illumination.
Anh Thi Nguyen, Jungyoon Cho, Malkeshkumar Patel, Duc Anh Vu, Jungeun Song, Dongseok Suh, Ambrose Seo, Joondong Kim, Dong‐Wook Kim   +8 more
wiley   +1 more source

Empirically Constraining the Spectra of Stellar Surface Features Using Time-resolved Spectroscopy

The Astrophysical Journal Letters
Transmission spectroscopy is currently the technique best suited to study a wide range of planetary atmospheres, leveraging the filtering of a star’s light by a planet’s atmosphere rather than its own emission.
David Berardo, Julien de Wit, Benjamin V. Rackham   +2 more
doaj   +1 more source

Lattice Dynamics of Rutile Germanium Dioxide (r‐GeO2)

Advanced Electronic Materials, EarlyView.
The rutile polymorph of GeO2 is a promising ultra‐wide bandgap material, but key properties for its technological exploitation remain poorly understood. Using polarization angle‐resolved Raman spectroscopy, we resolve long‐standing uncertainties in the energies of Raman‐active phonons and extract relative Raman tensor elements.
Hans Tornatzky, Zbigniew Galazka, Tobias Schulz, Roland Gillen, Markus R. Wagner   +4 more
wiley   +1 more source

High-resolution Solar Image Registration Using Unsupervised Deep Learning

The Astrophysical Journal
High-resolution solar images captured at different wavelengths are essential for understanding solar activity. However, such images often exhibit geometric discrepancies due to varying instrument resolutions and observation conditions, making image ...
Hao Zhang, Bo Liang, Xiaoli Yan, Song Feng, Ding Yuan, Yunfang Cai, Wei Dai   +6 more
doaj   +1 more source

Robust C–V Ratio Technique for Profiling Defects in Proton‐Irradiated 4H‐SiC

Advanced Electronic Materials, EarlyView.
A noise‐robust C–V ratio technique is introduced to profile radiation‐induced defects in proton‐irradiated 4H‐SiC Schottky diodes. By using analytical capacitance ratios instead of numerical differentiation, the method directly extracts trap‐density and effective trap‐energy profiles at room temperature.
Kibeom Kim, Sung Yun Woo, Jeong Hyun Moon, Young Jun Yoon, Jae Hwa Seo   +4 more
wiley   +1 more source

Intensity-sensitive Quality Assessment of Extended Sources in Astronomical Images

The Astrophysical Journal Supplement Series
Radio astronomy studies the Universe by observing the radio emissions of celestial bodies. Different methods can be used to recover the sky brightness distribution (SBD), which describes the distribution of celestial sources from recorded data, with the ...
Xiaotong Li, Karel Adámek, Wesley Armour   +2 more
doaj   +1 more source

Heterogeneous Integration of Flipped Oxide Heterostructure Membranes for Nanoelectronics

Advanced Electronic Materials, EarlyView.
A flipped electronically reconfigurable STO/LAO freestanding membrane is demonstrated and integrated with various host platforms via controlled transfer. Using ultra‐low‐voltage electron‐beam lithography, conductive nanostructures are created at the buried STO/LAO interface. This novel approach enables heterogeneous integration of flipped complex oxide
Ruiqi Sun, Ahmed Omran, Muqing Yu, Kyoungjun Lee, Keeyong Lee, Soli Sung, Sangho Oh, Patrick irvin, Jeremy Levy, Chang‐Beom Eom   +9 more
wiley   +1 more source

Astronomical Image Compression Techniques Based on ACC and KLT Coder

Acta Polytechnica, 2011
This paper deals with a compression of image data in applications in astronomy. Astronomical images have typical specific properties — high grayscale bit depth, size, noise occurrence and special processing algorithms.
J. Schindler, P. Páta, M. Klíma, K. Fliegel   +3 more
doaj  

Pressure‐Induced Structural and Magnetic Evolution in Layered Antiferromagnet YbMn2Sb2

Advanced Electronic Materials, EarlyView.
Pressure tunes the delicate balance between structure, magnetism, and electronic states in quantum materials. In YbMn2Sb2, high‐pressure X‐ray and neutron diffraction reveal a trigonal‐to‐monoclinic transition near 3.5 GPa, accompanied by unconventional magnetic ordering.
Mingyu Xu, Matt Boswell, Aya Rutherford, Cheng Peng, Ying Zhou, Shuyang Wang, Zhaorong Yang, Antonio M. dos Santos, Haidong Zhou, Weiwei Xie   +9 more
wiley   +1 more source