搜索 - 科创

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注：本帖是科创论坛上第一次系统组织的探空火箭设计活动。由于多方面原因，该活动没有持续下去。我们筹备足见一个探空火箭的研制小组。目前阿坯正在进行前期的可行性论证工作。由于探空火箭是一个系统的工...

本帖最后由 friedel 于 2014-1-24 16:05 编辑 RT，前两天弄了些CA-50铝酸盐耐火水泥打算自己做个Forge，就先试试这种材料的性能。混合完水泥，浇在玻璃称量瓶里，震荡排净...

观测日全食的时候，必须采用一定的减光措施。在没有任何保护措施的情况下目视太阳，几秒钟之内就会造成视网膜永久性的损伤，如果用没有减光设备的望远镜直接观察太阳的话，千分之一秒就足以导致失明。因为眼球内的视...

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