Results 241 to 250 of about 57,270 (311)

The Development of a Low-Cost Fresnel Lens UV Telescope with SiPM Array for Low-Light Atmospheric Transient Detection. [PDF]

Sensors (Basel)
Chiritoi G, Popescu EM.
europepmc   +1 more source

Seasonal and Diurnal Variability of Thermospheric Metastable Helium Observed by Multi‐Platform Observations and Numerical Modeling

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Metastable helium (He∗ ${\text{He}}^{\ast }$) in the thermosphere emits at 1,083 nm and provides a powerful diagnostic of thermospheric composition, solar radiation, and transport. Its detection remains challenging because of its extremely low density and high‐altitude.
Zhenwei Liu, Chuan Huang, Jinru Cheng, Tangsheng Cheng, Hang Zhou, Chaomei Wu, Chen Liang, Tingdi Chen, Weilong Luo, Chong Wang, Zhaofeng Wang, Ruocan Zhao, Xianghui Xue   +12 more
wiley   +1 more source

Fully convolutional neural networks for processing observational data from small remote solar telescopes. [PDF]

Sci Rep
Jóźwik-Wabik P, Popowicz A.
europepmc   +1 more source

Repeatable Velocity Fine Structure of Lightning K‐Leaders From a Single VHF Interferometer Made Three‐Dimensional

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract K‐processes re‐illuminate lightning channels at speeds of order 107 m s−1, but measuring their three‐dimensional (3‐D) propagation velocity has required multi‐station systems available at few sites. An error‐isomorphism range inversion upgrades a single very‐high‐frequency interferometer (INTF) into a 3‐D imager: Lightning Mapping Array (LMA ...
Xiangpeng Fan, Jie Shi, Yajun Li, Yijun Zhang, Paul R. Krehbiel, Guo Zhao, Tong Zhang, Jun Liu, Xiaoxin Li   +8 more
wiley   +1 more source

Isotopic evidence for a cold and distant origin of 3I/ATLAS. [PDF]

Nature
Cordiner M, Roth NX, Micheli M, Villanueva G, Farnocchia D, Charnley S, Biver N, Bockelée-Morvan D, Bodewits D, Chandler CO, Crovisier J, Drozdovskaya MN, Furuya K, Kelley MSP, Milam S, Noonan JW, Opitom C, Schwamb ME, Thomas CA.   +18 more
europepmc   +1 more source

How Can the Latent Heat Entrainment Flux in the Convective Boundary Layer be Characterized?

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract A proposed theoretical description of the latent heat entrainment flux at the top of a convective boundary layer (CBL) was tested. It is related to the vertical velocity scale times the ratio of the water vapor mixing ratio (WVMR) gradient to the Brunt‐Väisälä frequency. This relation was tested with different LiDAR and radiosonde measurements.
Linus von Klitzing, David D. Turner, Diego Lange, Christoph Senff, Volker Wulfmeyer   +4 more
wiley   +1 more source

Modular and Stereoselective Synthesis of Cyclobutane β‐Amino Alcohols

Angewandte Chemie, Volume 138, Issue 43, 19 October 2026.
Late‐stage functionalization and photoisomerization of 1,2‐azaborine leads to a general strategy for the synthesis of diversely substituted cyclobutane β‐amino alcohols. The relative stereochemistry of the resulting products is unambiguously defined by the stereospecific and stereoselective nature of the photoisomerization‐hydrogenation‐oxidation ...
Xinyu Yang, Tomoya Ozaki, Bo Li, Shih‐Yuan Liu   +3 more
wiley   +2 more sources

Jejunal leiomyosarcoma leading to intestinal intussusception: a case report. [PDF]

AME Case Rep
Chen Q, Yuan H, Zhou K.
europepmc   +1 more source

Selective N‐Functionalization of Pyrazoles

European Journal of Organic Chemistry, Volume 29, Issue 40, 27 October 2026.
This review traces the evolution of regioselective N‐functionalization strategies for pyrazoles, a key class of nitrogen heterocycles widely used in medicinal chemistry. Due to rapid tautomerism, N‐functionalization often lacks selectivity, leading to poor and unpredictable regioisomeric outcomes.
Lucas Popek, Matthias Schrader, Christopher J. Teskey   +2 more
wiley   +1 more source