动静压可倾瓦轴承有限元分析

对动静压可倾瓦轴承进行了有限元分析,同时还给出了孔式环面浅腔节流动静压可倾瓦轴承油腔尺寸的取值范围。     

Pressure Field of Multi-pad Annular Recess Hydrostatic Thrust Bearing

In order to solve the deformation of the hydrostatic thrust bearing with multi-pad annular recess in the heavy computer numerical control(CNC)equipment,the simulation concerning pressure field of hydrostatic thrust bearing with multi-pad annular recesses was carried out.The finite volume method of computational fluid dynamics(CFD)was used to compute the three-dimensional pressure field of gap fluid between the rotary worktable and the base.The influence of the rotational speed on the bearing pressure performance was studied based on CFD and lubrication theory,and the method revealed the pressure distribution law.The results qualitatively agree well with the experimental data.The results indicate that the oil cavity pressure decreases gradually with rotational speed enhancing.The reliability of a hydrostatic thrust bearing with multi-pad annular recess can be predicted through this method,and the optimal design of such products can be achieved,and the numerical simulation method can provide reasonable data for design,lubrication,experiment,and deformation computation of hydrostatic thrust bearing in the heavy CNC equipment.     

妊娠期及哺乳期小鼠第四脑室外侧隐窝室管膜超微结构的改变

观察妊娠期和哺乳期小鼠第四脑室外侧隐窝进行超微结构变化,探讨该部位室管膜及室管膜上结构与妊娠和哺乳功能的关系.该处室管膜细胞有旺盛的分泌现象,该现象与妊娠和哺乳周期密切相关.     

滇西少数民族地区学校民族课间操前景分析

运用文献资料、问卷调查、数理统计等方法,对滇西少数民族地区学校开展"民族课间操"的可行性进行分析。认为自编民族课间操具有体操的特征,又有民族舞蹈动作,且动作素材多、简单,音乐节奏强,群众基础好等特点,把其作为民族地区学校课间操活动,并引入中学体育校本课程具有很好的前景和开发价值。     

腰椎间盘突出并发侧隐窝狭窄的诊断和治疗（附48例分析）

４８例腰椎间盘突出并发侧隐窝狭窄均行手术治疗,其中２５例经椎板间开窗术,１９例经半椎板切除术,４例经全椎板切除术。术后随访３７例,其中优２２例,占５９．５％,良１１例,占２９．７％,优良率为８９．２％。笔者认为本病确诊需靠脊髓造影ＣＴ检查;手术以椎板间开窗、半椎板切除为主。如此手术创伤小,脊柱稳定性不受损,术后功能恢复快。     

油腔结构对高速动静压轴承性能的影响

研究了四种不同油腔形状的高速液体动静压轴承。研究内容包括轴承润滑油流量、承载能力、刚度、涡动频率，这四种油腔结构轴承分别是正方形油腔，三角形油腔、圆形油腔、角向小孔轴承。通过对这四种轴承性能比较出现，角向小孔轴承具有最优良的性能。将会在高速主轴单元中得到广泛应用。     

小学生在校课间体育活动的调查与对策

通过现场调研和学生问卷调查发现,我校小学生课间体育活动存在着"三少"现象:即参与活动的学生少、活动的场所少、活动的内容少。为改变小学生在校课间体育活动的现状,学校创建了孩子们喜爱的体育活动小园地,以活动园地为载体、推进学生快乐活动"自助餐"。校园体育活动小园地的创建及其推广使用,受到了学生们的欢迎,有效解决了活动内容少、活动场所少的问题,使更多的孩子们爱玩、能玩、会玩,也有效提高了学生的体质健康水平。