in this paper, static performance characteristics for a finite lenght two-lobe journal bearing lubricated with micropolar fluid is studied. using finite element method, steady-state film pressure is obtained by solving modified reynolds equation, based on micropolar lubrication theory. with the help of film pressure in bearing, the static performance characteristics in terms of load carrying ca...

According to the previous studies of sediment carrying capacity, a new method of sediment carrying capacity on perturbed theory was proposed. By taking into account the average water depth, average flow velocity, settling velocity, and other influencing factors and introducing the median grain size as one main influencing factor in deriving the new formula, we established a new sediment carryin...

Based on the theory of ecological footprint, and as land use/cover change the breakthrough point in Loess hilly area, the ecological carrying capacity analysis method was used to calculate the ecological carrying capacity of Shanghuang experimental area. The results showed that the total ecological carrying capacity in 1982, 2000 and 2010 were 242.47、750.53、929.68 hm. Meanwhile the per capita e...

background: inattention to ergonomic factors will influence the students’ health and cause discomfort during their adulthood. objective: the aim of this study was to determine the relationship between ergonomic and environmental conditions of classrooms and pain sensation in students. methods: this cross-sectional study was carried out on 442 elementary students of zahedan city in 2007. the typ...