烟草甲生物学特性最新研究进展

烟草甲Lasioderma serricorne（Fabricius）为世界性仓储物害虫，也是储烟的主要害虫之一。由于其分布广、繁殖量大，危害严重，国内外对其进行了大量的研究。本文综述了国内外对烟草甲生物学特性研究概况，以期为烟草甲的科学防治提供理论依据。     

Motion Regular Analysis and Its Simulation of the Rodless Drilling Unit''''s Guiding & Positioning Board

To analyze the stress of the guiding & positioning board and the effectiveness of the guiding & positioning device, aeenrding to guiding & positioning device's operational principle and structure, the guiding & positioning board's motion regular was analyzed bydiagrammatical method based on 2 postulated conditions. Considering about the working conditions' change, simulations in 5 different kinds of working conditions were done to cheek the correctness of the motion regulars obtained by diagrammatical method. Simulation results prove that the motion regulars are right, the postulated conditions have no effect on the obtained motion regulars. According to the simulation results, the motion processs's characters were drawn out at the same time.     

基于MLPG法的新型无网格法——多边形无网格法

为了提高无网格法的计算效率,该文提出一种新型MLPG法--多边形无网格法,该方法采用改进的PU函数作为形函数,试探函数预先满足位移边界条件;积分子域取为以节点为中心的多边形区域,多边形各个顶点与节点对齐;积分子域重叠少,计算效率高;建立了邻近点数据库,提高了邻近节点搜索速度.与传统的MLPG无网格法相比,多边形无网格法具有更强的实用性和更高的计算效率.分析实例证明多边形无网格法是一种精确和实用的数值方法.     

Solidworks中二维图形与三维模型的互化问题研究

介绍了利用Solidworks中的2D到3D工具条将二维图形创建成三维立体模型的方法,阐述了由三维模型自动转化生成二维工程图时贯彻国标和灵活适应国标的问题.     

杏仁油对实验性高血脂大鼠肝脏中脂酶活性及脂肪含量的影响

以实验性高血脂模型大鼠为实验对象,设置3个杏仁油剂量(0.5,1,1.5 mL)组、高血脂组(HG)和对照组(CG),观察了不同剂量杏仁油对高血脂大鼠肝脏总脂解酶(LA)、肝脏脂蛋白脂酶(LPL)和肝脂酶(HL)活性以及肝脏脂肪含量的影响.结果表明,杏仁油高剂量组(HDG)和杏仁油中剂量组(HMG)大鼠肝脏中LA、LPL、HL活性均显著高于高血脂组(P<0.01或P<0.05),杏仁油低剂量组(HLG)大鼠肝脏中LA、HL活性显著高于高血脂组(P<0.05),杏仁油高、中剂量组大鼠的肝脏脂肪含量显著低于高血脂组(P<0.01).因此,杏仁油具有提高实验性高血脂大鼠肝脏脂酶活性以及预防和改善肝脏脂肪积累的作用.     

番茄籽油对实验性高血脂大鼠血脂水平和血清转氨酶的影响

使用CO2超临界萃取技术提取精制番茄籽油,每日给实验性高血脂大鼠喂灌番茄籽油可使血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(LDL)以及血清谷丙转氨酶(ALT)、血清谷草转氨酶(AST)水平(P<0.05,P<0.01)显著降低.     

梗丝颜色发白的一种解决方法

梗丝的颜色太白,和叶丝掺兑在一起就会出现颜色的不协调。为解决这一问题,我们通过试验研究,找出了一种环保、安全的方法:烟梗在一定温度和湿度下的人工发酵,即烟梗真空回潮(两个周期)后,在人工发酵室(蒸汽压力0.2MPa,温度60℃,相对湿度70～75%条件下)发酵10-20h(根据发酵前烟梗颜色调整发酵时间),从而改善梗丝的颜色和感官质量。     

桩架的起架油缸铰座的分析计算

摘 要 本文系统阐述了桩架的基本组成和用途,桩架立柱的起驾方式,根据理论计算出桩架立柱的铰点力大小,并借助MATLAB软件进行运动仿真,找到了桩架立柱起架过程中起架油缸铰点力的变化情况,运用Solidworks软件建立起架油缸铰座的实体模型,结合ANSYS软件进行接触非线性有限元分析,得出了起架油缸铰座与上平台结构在面与面接触的情况下铰座的应力云图,为桩架立柱的铰点确定和起驾油缸铰座的开发和应用提供了依据。     

永磁电机在抽油机中的应用

通过对抽油机的负荷特点及拖动现状的分析,得出抽油机普遍采用的异步电动机都存在着＂大马拉小车＂的现象,电能浪费极其严重。进而提出永磁电动机在抽油机中应用的优点,节能显著。     

Motion Regular Analysis and Its Simulation of the Rodless Drilling Unit＇s Guiding ＆ Positioning Board

To analyze the stress of the guiding & positioning board and the effectiveness of the guiding & positioning device, aeenrding to guiding & positioning device's operational principle and structure, the guiding & positioning board's motion regular was analyzed bydiagrammatical method based on 2 postulated conditions. Considering about the working conditions' change, simulations in 5 different kinds of working conditions were done to cheek the correctness of the motion regulars obtained by diagrammatical method. Simulation results prove that the motion regulars are right, the postulated conditions have no effect on the obtained motion regulars. According to the simulation results, the motion processs's characters were drawn out at the same time.