Artificial nerve network forecasted yso in clay p - y curves is researched and 8 physical parameters are studied by using the principal component analysis method when the fracture load was not reached for a trial pile under lateral load , the ultimate load of the pile might be predicted to the field - surveyed load settlement data of existing trial pile and by h - s curve extension method and hyperbola method 在对粘性土p - y曲线计算参数y _ ( 50 )的研究中，对粘性土常规8个物理性质指标进行主成分分析，研究用人工神经网络分析预测粘土p - y曲线中的y _ ( 50 ) 。建立了神经网络计算模型，可用来计算预测粘性土p - y曲线中的y _ ( 50 ) 。
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Particularly , cr4 + - doped crystals as passive q - switch ( saturable absorber ) have got extensive attention , such as cr4 + : yag ， cr4 + : gsgg ， cr4 + : mg2sio4 and cr4 + : yso , which have the advantages of wild absorption band , good saturable absorption , long restored time , good photo - chemical stability , no fading , good thermal conductivity and high damage threshold 特别是近年来，掺cr4 +离子的各种晶体如cr4 + : yag ， cr4 + : gsgg ， cr4 + : mg2sio4和cr4 + : yso等作为被动调q开关受到了广泛的关注。它们具有很宽的吸收带和良好的饱和吸收性质，恢复时间较长，光化学性质稳定，无退化现象，热导性好，损伤阈值高。
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