搜索 - 科创网

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内容：因此，让接收机极为稳定，能发现万分之几甚至更小的幅度波动，是非常重要的。,用这种办法会带来一个问题，那就是底噪总的来说是白噪音，会有随机波动，必须长期平均（或其它数学手段）才能得到一个稳定的值。,这就要求接收机的长期稳定性足够好，不能自己都波动起来，而且是噪音稳定，不是大信号示数稳定。,通常的接收机（比如用于无线电监测的），经过简单恒温处理，大约能做到0.1dB的长期稳定度，相当于能够找回16dB的观测灵敏度，让天线口径缩小6倍。

内容：项目目标是做出一个可手持的设备，双筒望远镜安装上去以后可将人手产生的抖动角速度减小百分之90，以达到稳定视野的目的。,最初设计是把望远镜安装在一个二自由度的旋转平台上，电机驱动平台将望远镜向反方向扭转，达到稳定的目的。,最后决定，设备挂在望远镜下方，用加速转动惯量大的物体时所产生的反向力偶来抵抗手的抖动力偶，达到稳定的目的。

内容：介稳状态下系统的稳定性可用介稳区宽度和结晶诱导期来表示。,通常溶液的过饱和度与结晶之间的关系可由下图表示图中AB直线代表溶解度曲线，其下为不饱和区，称为稳定区：其上为过饱和区，这部分又被A'B'代表的超溶解度曲线分为两个部分。,A'B'线上方为不稳定区，在该区域内，即使不存在外来杂质或没有引入晶核，溶液也会自发成核。,C点位于不饱和稳定区；A位于溶解度曲线之上，对应的状态是饱和稳定态；B'点所在位置是介稳区和不稳区的分界线即超溶解度曲线为介稳极限。,所以降温过程中C-A-B'点依次经过不饱和稳定区-第一介稳区-第二介稳区-不稳定区。

约找到 5783 条结果，耗时 0.354 秒

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