Results 121 to 130 of about 843,058 (298)

Critical Limitations in Cryogenic Laser Cooling of Solids: Symmetry‐Related Fluorescence Trapping and Condensation‐Induced Parasitic Heating

Advanced Science, EarlyView.
This study uncovers two overlooked bottlenecks in cryogenic laser cooling of solids: symmetry‐driven fluorescence trapping and water vapor condensation. We demonstrate that breaking sample symmetry enhances fluorescence escape, while condensation dominates parasitic heating below 135 K.
Biao Zhong, Jiayi Zhang, Haodong Yang, Lianzhong Deng, Mauro Tonelli, Ercang Luo   +5 more
wiley   +1 more source

A Luminous Red Optical Flare and Hard X-Ray Emission in the Tidal Disruption Event AT 2024kmq

The Astrophysical Journal
We present the optical discovery and multiwavelength follow-up observations of AT 2024kmq, a likely tidal disruption event (TDE) associated with a supermassive ( M _BH  ∼ 10 ^8 M _⊙ ) black hole in a massive galaxy at z = 0.192.
Anna Y. Q. Ho, Yuhan Yao, Tatsuya Matsumoto, Genevieve Schroeder, Eric R. Coughlin, Daniel A. Perley, Igor Andreoni, Eric C. Bellm, Tracy X. Chen, Ryan Chornock, Sofia Covarrubias, Kaustav Das, Christoffer Fremling, Marat Gilfanov, K. R. Hinds, Dan Jarvis, Mansi M. Kasliwal, Chang Liu, Joseph D. Lyman, Frank J. Masci, Thomas A. Prince, Vikram Ravi, R. Michael Rich, Reed Riddle, Cassie Sevilla, Roger Smith, Jesper Sollerman, Jean J. Somalwar, Gokul P. Srinivasaragavan, Rashid Sunyaev, Jada L. Vail, Jacob L. Wise, Sol Bin Yun   +32 more
doaj   +1 more source

High‐Conductivity Electrolytes Screened Using Fragment‐ and Composition‐Aware Deep Learning

Advanced Science, EarlyView.
We present a new deep learning framework that hierarchically links molecular and functional unit attributions to predict electrolyte conductivity. By integrating molecular composition, ratios, and physicochemical descriptors, it achieves accurate, interpretable predictions and large‐scale virtual screening, offering chemically meaningful insights for ...
Xiangwen Wang, Muyang Chen, Gengyi Bao, Yan Lai, Jinghe Cao, Xinhua Liu, Rui Tan   +6 more
wiley   +1 more source

GRB 190114C: Fireball Energy Budget and Radiative Efficiency Revisited

The Astrophysical Journal
The jet composition of gamma-ray bursts (GRBs), as well as how efficiently the jet converts its energy to radiation, are long-standing problems in GRB physics.
Liang Li, Yu Wang
doaj   +1 more source

Leaky‐Integrate‐Fire Neuron via Synthetic Antiferromagnetic Coupling and Spin‐Orbit Torque

Advanced Science, EarlyView.
A spintronic leaky‐integrate‐and‐fire neuron is realized using Spin Orbit Torque driven domain‐wall motion for integration and synthetic antiferromagnetic coupling for the leaky process. The specialized Hall‐bar geometry enables controlled DW dynamics, achieving repeatable integration and firing events. This compact, CMOS‐compatible design highlights a
Badsha Sekh, Durgesh Kumar, Hasibur Rahaman, Ravi Shankar Verma, Ramu Maddu, Jianpeng Chan, Wai Lum William Mah, Stuart S. P. Parkin, S. N. Piramanayagam   +8 more
wiley   +1 more source

Relativistic Effects and Gamma-Ray Burst Polarization in Power-law Evolution

The Astrophysical Journal Supplement Series
Despite decades of polarization observations and high significance of polarized γ -ray, X-ray, optical, and radio emissions in gamma-ray bursts (GRBs) accumulating in dozens of cases, people have yet to find a consistent scenario for understanding the ...
Liang Li, She-Sheng Xue, Rong-Gen Cai
doaj   +1 more source

The role of magnetar transient activity in time-domain and multimessenger astronomy

Frontiers in Astronomy and Space Sciences
Time-domain and multimessenger astronomy (TDAMM) involves the study of transient and time-variable phenomena across various wavelengths and messengers.
Michela Negro, George Younes, Zorawar Wadiasingh, Zorawar Wadiasingh, Zorawar Wadiasingh, Eric Burns, Aaron Trigg, Matthew Baring   +7 more
doaj   +1 more source

Spectroscopic Evidence of Edge‐Localized States in an Antiferromagnet Topological Insulator NdBi

Advanced Science, EarlyView.
Using spin‐polarized scanning tunneling microscopy (STM) in conjunction with quasiparticle interference, we successfully identify distinct signatures of the ferromagnetic and antiferromagnetic terminations in NdBi, a rare‐earth monopnictide exhibiting non‐trivial topology and magnetism. We demonstrate that step edges on ferromagnetic surfaces host well‐
Avior Almoalem, Rebecca Chan, Brinda Kuthanazhi, Juan Schmidt, Jose A. Moreno, Hermann Suderow, Paul Canfield, Taylor L. Hughes, Vidya Madhavan   +8 more
wiley   +1 more source

Could the Interband Lag of Active Galactic Nucleus Vary Randomly?

The Astrophysical Journal
The interband lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags remains under debate.
Zhen-Bo Su, Zhen-Yi Cai, Jun-Xian Wang, Tinggui Wang, Yongquan Xue, Min-Xuan Cai, Lulu Fan, Hengxiao Guo, Zhicheng He, Zizhao He, Xu-Fan Hu, Ji-an Jiang, Ning Jiang, Wen-Yong Kang, Lei Lei, Guilin Liu, Teng Liu, Zhengyan Liu, Zhenfeng Sheng, Mouyuan Sun, Wen Zhao   +20 more
doaj   +1 more source

Emerging of Anomalous Higher‐Order Topological Phases in Altermagnet/Topological Insulator Heterostructure by Floquet Engineering

Advanced Science, EarlyView.
We combine altermagnet with topological insulators and subject the structure to Floquet driving. This breaks time‐reversal symmetry and creates a new type of higher‐order topological insulator. Its key feature is the emergence of programmable “0/π‐corner modes” that can be controlled by magnetic field direction, offering a novel dynamic platform for ...
Donghao Wang, Arnob Kumar Ghosh, Yongchun Tao, Fusheng Ma, Cheng Song   +4 more
wiley   +1 more source