采用静电激励和电磁检测的平面振动陀螺仪

我们设计了一种采用静电激励（下同）和电磁检测的平面振动陀螺仪,该陀螺仪具有较大的敏感性并且可以采用表面微机械技术,大规模微机械技术和常规加工技术来加以制造,本文推导了陀螺仪和电磁检测系统的方程,该方程可决定采用静电激励和电磁检测的平面振动陀螺仪的输出特性,当驱动频率等于检测频率时,输出最大,谐振器的谐振频率由支架刚度地ＡＣ驱动电压为３Ｖ,电路放大倍数为２３４５,ＤＣ偏置电压为１５Ｖ,ＤＣ场电流为５     

线性关阀水击压力的预测及影响因素的分析

本文探讨了阀门线性关闭引起的最大压力水头问题。在研究中引入无因次变量可使初始阀门水头损失的细微影响显式化，并使其与管线摩阻水头损失的影响相互区别开。由无因次变量相关图可以看邮，因关阀引起的最大压力水头与初始管线摩阻水头损失、初始阀门水头损失、阀门固有流量特性及关阀时间有关。文中还讨论了最大压力水头变化的趋势，最后从水击的观点出发，以一个实例说明了相关图的应用情况。本文对阀门的选择和校验等具有指导意     

Germination and growth of wheat in simulated Martian atmospheres

One design for a manned Mars base incorporates a bioregenerative life support system based upon growing higher plants at a low atmospheric pressure in a greenhouse on the Martian surface. To determine the concept's feasibility, the germination and initial growth of wheat (Triticum aestivum) was evaluated at low atmospheric pressures in simulated Martian atmosphere (SMA) and in SMA supplemented with oxygen. Total atmospheric pressures ranged from 10 to 1013 mb. No seeds germinated in pure SMA, regardless of atmospheric pressure. In SMA plus oxygen at 60 mb total pressure, germination and growth occurred but were lower than in the Earth atmosphere controls.