创新教学方法培养创新人才

培养具有创新能力的优秀人才是对高等教育的本质要求：学生创新能力的培养具有多种方式，其中，创新教学方法是培养创新人才的一种有效途径。我们在农业工程类专业课程教学中，积极进行教学方法的创新，鼓励学生进行自主性教学活动，提高了学生的创新能力，收到了很好效果。     

用振动挤淤法处理标准海堤的软土地基

以淤泥类软土的动力特性为基础发展起来的振动挤淤法，在标准海堤软土地基处理中有其独特的实用性。根据海堤的工程特点，分析了振动挤淤法在处理海堤软土地基的必要性和可行性。并着重阐述了振动挤淤法中3个关键施工参数的理论分析和工程实践，这3个参数包括：基础埋深，最小垫层厚度，施工机械作业参数。     

水产品收购价格预测的时序组合模型研究

我国水产品市场已经出现了区域性、结构性的供大于求及价格持续下降的现象。为此，对水产品价格进行预测是必要的。以1978～1999年数据为样本，利用时序组合模型对2000年的水产品收购价格进行了预测研究。     

计算机图解适线法

该文编制的计算机图解适线法程序,对于总体为皮尔逊Ⅲ型分布的样本系列,能够利用计算机屏幕(或绘图仪)目估适线。主要计算结果为适线法确定的参数X、CV和CS,以及任何指定频率的设计值XP。     

车架刚度及强度的有限元分析

运用有限元分析的方法,采用合理的模型简化方法及一种新型的连接模拟方式,对某型车车架建立了基于ANSYS的有限元模型。对车架依据法规要求在各种工况下进行了静力学分析,以保证车架具有足够的刚度和强度,并对薄弱部位提出了合理的改进意见,为后续结构的改进和优化提供了理论依据。     

宁蒙引黄灌区田间节水潜力计算方法分析

以黄河干流宁蒙大型自流引黄灌区为研究对象,采用分项法以及两种计算顺序对宁蒙引黄灌区田间节水潜力进行了计算,分析了不同计算顺序对田间节水潜力计算结果的影响,并采用综合法对分项法计算结果进行了验证,表明计算方法可靠。     

活塞中凸型线数控加工的一种逼近方法

针对发动机活塞纵剖面型线的不规则性,提出了采用3次样条插值和双圆弧拟合相结合逼近加工曲线的方法,推导出了适用于计算机编程的3次样条插值计算公式;分析了双圆弧拟合的原理,并对逼近误差进行分析,满足了加工拟合曲线的要求。     

发动机曲轴的损伤及修复

介绍了发动机曲轴的运行环境,分析了发动机曲轴的损伤形式、损伤部位及特点,简述了曲轴技术状况的检查方法.针对发动机曲轴的损伤程度和不同的损伤类型,给出了修理尺寸法、堆焊、电弧喷涂、电刷镀和手工电弧焊修复工艺,并对堆焊和电刷镀修复工艺进行了详尽地介绍和分析.     

Cover crop evapotranspiration under semi-arid conditions using FAO dual crop coefficient method with water stress compensation

Cover cropping is a common agro-environmental tool for soil and groundwater protection. In water limited environments, knowledge about additional water extraction by cover crop plants compared to a bare soil is required for a sustainable management strategy. Estimates obtained by the FAO dual crop coefficient method, compared to water balance-based data of actual evapotranspiration, were used to assess the risk of soil water depletion by four cover crop species (phacelia, hairy vetch, rye, mustard) compared to a fallow control. A water stress compensation function was developed for this model to account for additional water uptake from deeper soil layers under dry conditions. The average deviation of modelled cumulative evapotranspiration from the measured values was 1.4% under wet conditions in 2004 and 6.7% under dry conditions in 2005. Water stress compensation was suggested for rye and mustard, improving substantially the model estimates. Dry conditions during full cover crop growth resulted in water losses exceeding fallow by a maximum of +15.8% for rye, while no substantially higher water losses to the atmosphere were found in case of evenly distributed rainfall during the plant vegetation period with evaporation and transpiration concentrated in the upper soil layer. Generally the potential of cover crop induced water storage depletion was limited due to the low evaporative demand when plants achieved maximum growth. These results in a transpiration efficiency being highest for phacelia (5.1 g m⁻² mm⁻¹) and vetch (5.4 g m⁻² mm⁻¹) and substantially lower for rye (2.9 g m⁻² mm⁻¹) and mustard (2.8 g m⁻² mm⁻¹). Taking into account total evapotranspiration losses, mustard performed substantially better. The integration of stress compensation into the FAO crop coefficient approach provided reliable estimates of water losses under dry conditions. Cover crop species reducing the high evaporation potential from a bare soil surface in late summer by a fast canopy coverage during early development stages were considered most suitable in a sustainable cover crop management for water limited environments.     

液压挖掘机铲斗机构的动力分析

液压挖掘机铲斗机构可视为驱动力矩随时间变化的铰链四杆机构。分别用拉格朗日方程和质量凝聚法对其进行了动力分析，为设计者分析、决策和控制提供了计算依据，对于计算机求解具有普遍意义。