When the gas flux is constant, the ratio of reduced resistance is improved with the increase of the water stream velocity. However, the relationship between the gas flux and the ratio of reduced resistance is more complex. When the water stream velocity is constant, if the gas flux is small in contrast, the effectiveness of reduced resistance is not obvious. But when the gas flux increased, the jetted gas will form """"archform"""" which will augment the shape resistance. In this condition, resistance could not be reduced and could even be increased, if the gas flux continues to be increased. So that there needs setting a baffle called step, which introduces the jetted gas into the turbulence boundary layer. In this case, the shape resistance may be fairly great. Besides, the waterline of model has also some effect on the ratio of reduced resistance, which acts on the size of wave. If waterline is deep, the wave could not affect the deployment of microbubble layer, so there is almost no effect on ratio of reduced resistance. However, the wave would affect distributing of microbubble layer under the model so that the gas could leak out from the two sides of model and directly affect the ratio of reduce resistance if the waterline is very small. Whether installing the dashplate or not has also the great influence on the effectiveness the ratio of reduced resistance. From the results of experiment, conclusion is that adding dashplate will greatly improve the effectiveness of reduced resistance.

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The author also presents the following phenomena which must have significant implications on the mental health of children in many countries in Asia . 1 Nuclearization of the family system and alarming increase of divorce, 2 Reduction of the number of children in a family, 3 Rising number of working mothers and women ? s equal right movement, 4 Lack of opportunity for parents to learn how to raise a child, 5 Steep competition and exclusive emphasis on scholastic achievement in school, 6 Marked changes in value orientations from traditional to modern ones, 7 Confusing and often contradictory advices by "experts" and "professionals" on child rearing and child education, 8 New tides of globalization and confounding co-existence of multi-cultures in most countries and emergences of virtual world, IT and BT industry in some advanced countries, resulting in new forms of psychopathology such as 'internet addiction' and extreme social isolation.Implications of these findings in terms of interventions and prevention for mental health children in developing countries are discussed in developmental, ecological and ethological points of view.

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