At first, it studied the plant model of position and force system about valve control unsymmetrical hydraulic ram.

首先，建立了阀控非对称缸位置控制系统与力控制系统的数学模型。

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Most of the valve is sealed using force, that the valve is closed, forced to rely on external ram pressure to the valve seat to ensure the sealing surface of the seal.

大部分闸阀是采用强制密封的，即阀门关闭时，要依靠外力强行将闸板压向阀座，以保证密封面的密封性。

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The motion process of vibrating plate ram was analyzed, and the force bearing formulae of plate ram was derived.

分析了振动平板夯的运动过程，导出了平板夯的受力公式。

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If you've been waiting for the least burdensome tablet you could find, Sony's 17.5 ounce, 6.9mm thick Xperia Tablet Z is now up for pre-order in the US. On top of being the lightest, slimmest 10-inch slate on the market, it's not exactly slumming spec-wise either: there's a 1.5GHz quad-core Snapdragon processor, Android 4.1.2 Jelly Bean, 2GB RAM, an 8.1-megapixel Exmor R camera, NFC, LTE, S-Force virtual surround sound, 32GB storage and a 10.1-inch 1, 920 x 1, 200 display with Mobile BRAVIA Engine 2 tech.

ENGADGET: Sony Xperia Tablet Z now up for pre-order, scheduled to ship May 24th (video)