The best semi-auto shotguns fire rounds reliably and cycle quickly. Even in lighter platforms, they soak up recoil and swing to birds and clays naturally. It’s no wonder that so many waterfowlers, ...

There’s a long list of highly functional (and durable) semi-auto shotguns that handle beautifully and shoot straight, but have never received the fanfare they deserved. Some weren’t brought to market ...

Abstract: Polarization direction indicator (PDI) by vortex retarder has been proved to be a powerful tool in polarization direction measurement. It features on one-shot, nonmechanical motion and ...

Abstract: Trucks have the problems of frequent braking and long-term braking during long-slope transportation. As the temperature of the traditional eddy current retarder is as high as 500 °C during ...

The Pennsylvania Department of Transportation denied Rush Township’s request to ban the use of brake retarders, often called Jake brakes, on a stretch of Route 54. The township learned of the denial ...

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