Abstract: This paper proposes a hybrid beamforming framework for massive multiple-input multiple-output (MIMO) in near-space airship-borne communications. To achieve high energy efficiency (EE) in ...

Abstract: To address the complexities of spatial non-stationary (SnS) effects and spherical wave propagation in near-field channel estimation (CE) for extremely large-scale multiple-input ...

What are the most pressing global crises in 2026? Each year, the International Rescue Committee’s (IRC) Emergency Watchlist identifies the countries at greatest risk of new or worsening humanitarian ...

When my cofounder and I were accepted into a competitive startup accelerator program in fall 2025, we applied with an ambitious idea: to build an “AI scientist” for machine learning research. What ...

Mathematics, like many other scientific endeavors, is increasingly using artificial intelligence. Of course, math is the backbone of AI, but mathematicians are also turning to these tools for tasks ...

Five years ago, mathematicians Dawei Chen and Quentin Gendron were trying to untangle a difficult area of algebraic geometry involving differentials, elements of calculus used to measure distance ...

Owners reported sudden deceleration, downshifting, and temporary rear wheel lockups in 2015-2017 models. The investigation by the National Highway Traffic Safety Administration could potentially lead ...

Microsoft’s MSFT-2.58%decrease; red down pointing triangle Copilot chatbot has become central to its artificial-intelligence strategy as the company’s close partnership with OpenAI diminishes. But the ...

iPhones As a former phone engineer, I have some serious concerns about Apple potentially introducing variable apertures into the iPhone 18 Pro macOS macOS Tahoe 26.4 public beta is here — and these ...

The Toyota Tundra has been part of the automaker's American-market offerings since 2000, when the first-gen Tundra debuted as a successor to the Japanese-assembled T100 pickup. Since then, it has ...