用化学创造出新年第一场“流星雨” AP基固体推进剂指以过氯酸铵（ammonium perchlorate, AP）为主要氧化剂的复合固体火箭推进剂。常见的组成包括：氧化剂（AP）、高分子粘结剂/...

Core-shell oxygen-fuel composites for enhanced propellant ignition and combustion

Pure Scenes on Instagram: "Why didn’t faster shells always mean better armor penetration? In this video, we break down the brilliant engineering behind one of the most effective tank ammunition designs ever created the Armor-Piercing Capped Ballistic Capped (APCBC) shell. You’ll learn how pure kinetic energy can fail against sloped armor, why shells ricochet at extreme angles, and how engineers solved this problem using a clever two-cap system. First, a soft cap deforms on impact, correcting the