The effect of additives in the lubricant of a composite bearing with an inclined stepped surface
Abstract A micropolar fluid, which is characterized by the presence of suspended rigid particles with microstructure, can be used as a model for lubricants containing suspended additive particles. The theory is applied to the study of the lubrication of an inclined stepped composite bearing with an additive-containing lubricant. The theory yields results showing an increase in the load-carrying capacity and a reduction in the coefficient of friction which are in agreement with experimental observations.
In selecting the appropriate extraction conditions for a range of pesticides from soil, the nature of the soil-pesticide interaction is of fundamental importance. This paper reviews the work that has been undertaken with a view to understanding the role that soil-pesticide interactions have played in affecting the extraction process. Supercritical fluid extraction has been of particular interest to this work. It is noted that the majority of papers cited refer to the use of spiked soil samples. The experimental conditions required for extraction from native samples may well be different. In this situation, the use of mathematical models, both for soil-pesticide interactions and the extraction process may well be useful. The important factors affecting the recovery of analytes from soils are summarised.