搜索 - 科创

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超声波测量，看似简单，但是根据IC等选择的不同也会表现出非常大的差异性。此外，温度，干扰也必须仔细的考虑。超声波传感器的选择是成功的重要条件之一，那种看起来就很粗糙的传感器坚决不买，我发现加工工艺上的...

有一些不能确定的因素：1、积极因素：因为用盖革管测还有一层云母，那层云母是刚好可以截止一部分α的，可以做个实验，用10μm左右的铝箔遮盖，这时候盖革管已经基本测不到α了，但用闪烁体依旧可以看到发光，从...

4年过去了，一些新的证据逐渐披露。特别是一项2022年的综述［1］集合了许多离焦实验的证据，证据强度较此前的流行病学证据高。目前观点倾向于部分离焦对近视进展有明显影响。接触镜是一种周围视野离焦，玩手机...

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