基于精准供给教学团队建设的路径与成效--以广东生态工程职业学院林业技术专业群为例

教学团队的建设是职业教育的关键,高质量的师资力量能够明确人才培养目标、保证教学质量、推动专业建设、实现人才的精准供给。文中以广东生态工程职业学院林业技术专业群为例,基于精准供给的视角,总结了教学团队建设的路径:一是构建合理的团队结构;二是建立团队带头人管理机制;三是建立"传帮带"培养模式;四是推进校企合作机制;五是构建技能学习型团队;六是强化信息化教学。实践证明,加强教学团队的建设,对促进专业的发展、实现人才精准供给具有积极的作用。     

突涌地质隧道TSP法弹性参数判识研究

结合云南4座在建高风险隧道典型突涌实例,对不同不良地质发生突涌的地质情况及突涌段落地震波反射法(TSP)的预报成果进行总结,分析各类突涌发生的工程地质条件和地震波反射法物理参数,归纳隧道突涌地质特征,得出大规模突涌时地震波反射法物理参数中纵波速度V_p、横波波速V_s、纵横波速比V_p/V_s和泊松比σ四项参数的判断标准:(1)富水时,V_p/V_s与σ都呈增长趋势,V_p/V_s变化率增长约5%以上,σ变化率增长约10%以上;(2)富水时,V_p/V_s由1.7→2.0变化,σ由0.25→0.3变化;(3)层状裂隙或构造破碎时,V_p均呈下降趋势;(4)存在裂隙及富水通道时,V_s均呈下降趋势;(5)V_p和V_s同时下降时,围岩破碎及地下水发育程度同步上升;(6)V_p上升、V_s下降时,围岩完整程度变化不大,地下水或裂隙发育程度上升。     

The uplift capacity of single-plate helical pile in shallow dense sand including the influence of installation

The helical pile has been used to resist the tension for a long time. However, the prediction of the uplift capacity of helical piles including the influence of installation is still a challenge in design. Based on the change in stress according to Mohr-Coulomb failure criterion, a simple theoretical method has been developed, which can calculate the uplift capacity of shallow pre-embedded circular plate anchors and the uplift capacity of helical piles installed by torque and compression. In order to analyse the influence of installation process of a single-plate helical pile on its uplift capacity and verify the theoretical model, a series of model tests have been conducted in dense saturated sand. The single-plate helical piles with different out diameters of helixes have been installed with different installation speeds, and then, the single-plate helical piles have been moved up monotonically. The test results show that the installation speed and the size of the out diameter of the helix have significant influence on the uplift capacity of the helical piles, and the results of the theoretical method have a good fit with the test results. Using this simple theoretical method, the designer can easily predict the uplift capacities of helical piles, which includes the influence of installation.     

考虑高铁客运产品间交叉弹性的动态票价策略

将由特定高铁列车所提供的起讫点间的旅客运输服务定义为单个高铁客运产品。随着高速铁路越来越"公交化",同一起讫点间客运产品间的可替代性越来越强,票价的调整有了更精细化的要求。用经济学中的交叉弹性理论描述客运产品间的可替代程度,用指数需求函数描述客运产品的需求与票价的关系,构建并求解高铁动态票价优化模型,对客运产品间不同可替代程度下的最优动态票价策略进行研究。结果显示:高铁客运产品间的可替代性会影响票价策略的选择,且客运产品间可替代程度的增加是否有利于客票收益的提高与可行折扣票价集合的选取有关。     

考虑围岩蠕变特性的TBM隧道管片衬砌受力特性研究

为研究深部高地应力岩层中修建TBM隧道时管片衬砌结构的力学行为,以某深埋TBM工法隧道为研究对象,建立基于围岩蠕变和管片分块效应的衬砌-围岩复合模型,研究考虑时间效应下管片衬砌的受力特性。结果表明:考虑围岩蠕变效应下管片衬砌受力表现出明显的时间效应。随着围岩蠕变时间的延长,管片衬砌的形变、内力和接缝张开量均呈现两阶段增长,具体表现为前期呈线性增长,后期增加趋缓。洞周围岩应力经历三阶段变化,即先减小后增大直至稳定。围岩蠕变时间为100年时,管片衬砌的内力和形变量均接近极限值。研究结果可为深部高地应力且考虑围岩蠕变效应下的TBM隧道衬砌结构设计提供参考。     

A signal decomposition method based on repeated extraction of maximum energy component for offshore structures

Contrary to most signal decomposition methods that usually decompose an original signal into a series of components simultaneously, a novel approach based on repeated extraction of Maximum Energy Component (MEC) is proposed. The approach starts from determination of the MEC referring to the estimated Power Spectral Density (PSD) function, and then represents the MEC by employing an exponential function to fit the original signal. By defining a stopping criterion based on two adjacent estimated PSDs, each MEC can be accurately extracted with an improved performance throughout the entire signal decomposition. To verify the proposed method, a single degree-of-freedom system subject to harmonic loads has been examined. Numerical results show that the analytical response can not only be decomposed into four MECs corresponding to the excitation and the system, respectively, but also provide an accurate estimation of natural frequency and damping ratio of the system. Meanwhile, by observing results from the Ensemble Empirical Mode Decomposition (EEMD), Variational Mode Decomposition (VMD) and Prony based on state-space model (Prony-SS), an improved decomposition accuracy has been achieved from the proposed approach. Furthermore, experimental data from the Norwegian Deepwater Programme and two sets of field-test data from one fixed offshore platform and an offshore wind turbine have been used to demonstrate the correctness of the developed signal decomposition method. It is noted that divergence in results by Prony-SS can be observed when a very large model order is used, while the proposed method provides the better decomposition and reconstruction of signals.     

62310轴承故障的应对方法

以DK16A地铁电动车辆牵引电机62310轴承故障为例,分析了故障成因,并对相应的措施进行了论述。     

高校应该加强诚信教育与信用意识教育

近几年在某些高等学校发生了许多不守信用的事件，影响了高校的形象．因此，高校应重视信用建设，强化诚信教育和信用建设．     

柴油机主副连杆机构动力分析

认为主、副连杆是两个独立运动的刚体，它们通过关节销连接起来．通过坐标转换关系，研究主副连杆机构平面运动规律，导出了主副活塞运动的速度、加速度以及主、副连杆不动、摆动的加速度、角加速度．基于刚体平面运动理论，对V型柴油机主副连杆机构进行动力学分新，给出了计算公式，便于编程计算。