According to actual elements of two-hanging point horizontal boom of tower crane, the linearity and, nonlinearity were calculated and the calculated results were analyzed.

本文根据某塔机的双吊点水平动臂的实际参数，进行了其线性和非线性计算，并对其结果进行了较分析。

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This paper will establish a general deformation equation group for two-hanging point horizontal boom of tower crane, therefrom its deformation and internal force can be universally calculated.

对塔机双吊点水平动臂在主载荷下的线性和非线形变形，拟建立其通用的变形方程组，以便对其变形和内力进行普遍的计算。

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Four-link portal crane using the best combination of optimized boom system, with horizontal small gap, amplitude stable, low power consumption.

四连杆门座式起重机采用最佳优化的组合臂架系统，具有水平落差小、变幅平稳、功耗低的特点。

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Many environmental groups, of course, see the shale gas boom unleashed by hydrofracking and horizontal drilling technologies as more a curse than a blessing, producing contaminated water supplies and air pollution while scaring local landscapes.

FORBES: Will California Get Fracked?

This is all great stuff, and all necessary to create our ongoing shale boom, but the real marvel is the innovation that has take place in the realm of Horizontal Drilling.

FORBES: Horizontal Drilling: A Technological Marvel Ignored