Using Computers in Environmental Education: Interactive Multimedia and On-Line Learning. The Environmental Education Toolbox--EE Toolbox Workshop Resource Manual.
Using Computers in Environmental Education: Interactive Multimedia and On-Line Learning. The Environmental Education Toolbox--EE Toolbox Workshop Resource Manual.
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在环境教育中使用计算机：交互式多媒体和在线学习。
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
A. Alm
中科院分区：
文献类型：
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作者：
W. J. Rohwedder;A. Alm
一种包括由螺线管操作的弹簧偏置柱塞振动的球体的阀门，其中球体在稍大的空腔中交替地对每个入口和排气口的一端移动，以控制例如从入口端口和空腔连接的位移可调活塞的相对两侧的压力。如果需要，活塞的行程可以调整。螺线管由频率可调的交流电源供电。一个突出的特点在于在进气口的另一端使用针阀。因此可以进行泰勒化，而在现有技术中，同样的事情在其他情况下是不可能的。
A valve including a ball vibrated by a solenoid operated spring biased plunger wherein the ball is moved against one end of each of inlet and exhaust ports alternately in a somewhat oversized cavity to control, for example, the pressures on respective opposite sides of a displacement adjustable piston connected from the inlet port and cavity. The stroke of the piston may be made adjustable, if desired. The solenoid is energized with an A.C. source that has an adjustable frequency. An outstanding feature resides in the use of a needle valve at the other end of the inlet port. Tayloring can thereby be performed, whereas the same had not been otherwise possible in the prior art.