墙梁的实用设计计算方法

作者在文中阐述在墙梁设计中应按施工、使用两个阶段作用的荷载及结构的工作性能对墙梁进行相应的验算,并对墙梁的正截面抗弯强度和斜截面的抗剪强度进行详细的计算。     

油锯人机界面的优化研究

该文通过实验研究探讨了油锯人机界面几何参数对操作者主观施力及对其身体生理负荷的影响规律 .通过对实验数据的回归得出了高把油锯和矮把油锯的人机界面几何参数与评价指标 (最大有效扭矩、力损耗因子、肌肉收缩强度 )之间存在的定量化方程 .建立了油锯的人机界面几何参数优化的目标函数 ,并求出了高把油锯和矮把油锯的最佳几何参数 .高把油锯的最佳几何参数 :把手横轴距为 5 40mm ;把手与地面垂轴距为 6 88mm ;把手与油箱后部纵轴距为 186mm ;把手直径为 30mm ;把手倾角为 33° .矮把油锯的最佳几何参数 :把手横轴距为 14mm ;把手纵轴距为 40 0mm ;把手垂轴距为 5 0mm ;把手直径为 2 8mm ;把手倾角为 2 3     

具有初速度的落体偏东问题

落体偏东是科里奥利力对沿竖直方向运动的物体的作用结果,为了更进一步了解地球自转对落体的影响,讨论了在纬度为λ高h的上空,物体的初速度为ν,方向为南北方向的落体偏值计算,以及在纬度为λ高h的上空,物体初速度为ν,方向为东西方向的落体偏值计算.     

传统框剪结构的改造与应用

本文叙述了框剪结构中方案阶段的重要性。在这一阶段应将问题涉及的各个方面考虑周到,对方案构思严谨,以便为后阶段各个环节打下良好基础。     

Effects of artesunate on membrane surface morphology of human gastric cancer SGC-7901 cells observed under atomic force microscope

AIM: To detect the membrane surface morphology of cancer cells treated with artesunate (ART) under atomic force microscope (AFM). METHODS: Human gastric cancer SGC-7901 cells were cultured and treated with different concentrations of ART for 24 h. The membrane surface morphology, three-dimensional structures and ultrastructural changes of SGC-7901 cells were observed under AFM. The apoptosis of SGC-7901 cells was detected by flow cytometry. RESULTS: The AFM images revealed that the cell nuclear area was full and the surface of cell membrane was flat and smooth in control group. Compared with control group, the cell nuclear area collapsed and suffered atrophy, and the membrane surface had more pores in ART treatment groups. More pores were observed and the diameter of the pores was increased with the increase in ART concentration. The cell membrane ultrastructure showed that the particles in control group had an intensive distribution, some were cord-shaped and some gathered into a mass. The particles in ART treatment groups were fewer and distributed sparsely. Moreover, there were obvious lacunae in the surface of cell membrane. Quantitive measurement found that the height of cell nucleus area was decreased, and the surface root mean square roughness (Rq) and the surface average roughness (Ra) became smaller in ART treatment groups compared with control group. The apoptotic rates of the cells in ART treatment groups were increased with the increase in ART concentration, and were all significantly higher than that in control group. CONCLUSION: Our findings emphasize the significance of AFM in exploring the changes of the membrane surface morphology at nano-scale resolution following the treatment with anticancer drugs, which could not only identify the specific characteristics of morphological changes of the tumor cells, but also provide micromorphological references to reveal the mechanisms of anticancer drugs.     

大直径人工挖孔扩底灌注桩实际应用及效益比较

本文通过对大孔径人工挖孔扩底灌注桩基础与一般钻孔灌注桩基础受力及经济比较,在地质条件合适的情况下,推荐采用大孔径人工挖孔扩底灌注桩基础。     

江西农户庭院经济资源潜力研究——(Ⅰ)农户庭院土地和劳动力潜力研究

通过对京九线江西段１９个沿线县（市、区）１１５８个农户和１６个非沿线县（市、区）８９８个农户庭院经济现状的对比调查结果，推算出江西全省农户庭院面积约为２４万ｈｍ２，占耕地面积１／１０左右；可用于种植业的土地约为１１万ｈｍ２，相当于耕地面积的１／２０左右；剩余劳动力约３００万个，发展潜力很大。     

汽车前后轴制动力分配原理

对汽车在刹车状态下的滑移情况进行了力学分析,并对不同速度下汽车的刹车及前后刹车时间的差异所产生的不同刹车效果进行了分析。     

外商对华投资的正负效应分析

利用统计学的分析方法,分析了我国利用外资的正、负面效应。     

Employment

The 1990s began with unprecedented market conditions for labour: unemployment rates were reaching their highest level in over 50 years, participation in the labour market had fallen to historically low levels and net emigration was widespread across all occupations. It seemed that things could only get better. While some did benefit from the limited growth that took place in the nineties, many did not. The greater inequality generated during the 1980s was fanned by the deregulation of the labour market and remained undiminished throughout the following decade. The marked reduction in manufacturing employment in the 1980s continued into the early 1990s negatively impacting Maori and Pacific Island men and women in particular. Increasingly post‐secondary school education became necessary to gain entry into regular work and those with little formal education and few work skills fell further down the queue. These changes are closely allied to the processes of globalisation which is already exercising considerable influence on the employment opportunities of New Zealanders.