Researchers from the University of Pretoria debunk the myth that high oxygen levels were essential for ancient insects' 70cm ...

Abstract: Achieving a high compression factor and stable long-distance transmission of electron beams presents significant challenges for developing multibeam devices, especially those that employ ...

Supply Side is a series of occasional articles about companies in the supplier marketplace. Steve Sanett is director of business development for Penta Laboratories in Newbury Park, Calif. Radio World: ...

One of the most important U.S. task forces of World War II—which may do the enemy as much damage as any that the nation sends overseas—consists of several thousand scientists. In complete military ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

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I used to follow a 10-step skin care regimen that was predictable, comforting, and so expensive that my bank account still doesn’t trust me. I’ve since switched to using fewer, simpler products, many ...

Given appropriate models for vacuum tubes, circuit simulators such as SPICE make analysis based on such nonlinear models a tractable effort. The Langmuir, Leach, and Koren models are discussed for the ...

Gyrotrons are fundamental to the operation of fusion energy devices. These high-power microwave systems generate millimetre-wave electromagnetic radiation, which is essential for heating and driving ...

Abstract: The performance of the electron beam will greatly affect the performance of the traveling wave tube (TWT). The electron gun and focusing system (EGFS) are key parts of TWT, which complete ...