Enhanced oxygen evolution activity in NiFe layered double hydroxides via Ce doping and oxygen vacancy engineering

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В Финляндии предупредили об опасном шаге ЕС против России09:28

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There is a plan to prevent such a strike—the Space Surveillance Network, a bevy of sensors that the military uses to track space debris. NASA monitors what’s unofficially known as the “pizza box,” a sort of no-fly zone around the ISS. When pieces of debris are predicted to enter the box—if there’s at least a 1 in 100,000 chance of collision—mission controllers order avoidance maneuvers, firing thrusters that move the ISS and dodge the trash. The technique has been used dozens of times since the first ISS module launched in 1998. But the system only tracks about 45,000 larger pieces, and all sensors have noise. Plus, risk thresholds can miss stuff, sometimes badly. In 2025, Chinese astronauts were briefly stranded at their station after debris hit their return vehicle.

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激活函数虽然只是神经元里的一小步,但却是深度学习的一大步。没有它,深度学习就不会有今天的辉煌。它让神经网络从“线性堆叠”变成了真正的“非线性智能体”,能够处理复杂的视觉、语言和跨模态任务。