An Investigation on Low Frequency Combustion Oscillation

This paper deals with a combustion stability of diffusion flame. A simplified linear differential equation of second order, which involves the parameters estimated from the states of steady combustion, has been suggested to discuss theoretically the nature of oscillatory combusion about a two-dimensional combustion chamber. Its validity has been testified by comparing calculated results with experimental ones. Results obtained have indicated that factors markedly affecting the low-frequency oscillatory combustion are primary volumetric air-fuel ratio, duct length of combustion side, shape of burner and inlet throttles. But outlet throttle gives little effect on the stability of combustion

An Arrangement of Flow Velocities and Turbulence Profiles of Co-Axial Cold Jet

Results of calculations and experiments on the cold co-axial flow presented in this paper are summalized as follows ; (1) A theoretical expression method for co-axial flow field of two dimension is investigated to estimate more exactly the flow profile and the velocity gradient. (2) Measurements of mixing length were carried out for the confined co-axial jet flow. On the basis of measured data, inquiry is made for the propriety of the assumption proposed in the previous paper (1) that the mixing length may be expressed as a function of the minimum distance to the nearby wall. (3) Experimental inquiry was also done on the corelation between Lagrangian length scale and the mixing length

Sharing and Composing Video Viewing Experience

Non

Prolonged maturation of prefrontal white matter in chimpanzees

Delayed maturation in the prefrontal cortex, a brain region associated with complex cognitive processing, has been proposed to be specific to humans. However, we found, using a longitudinal design, that prefrontal white matter volume in chimpanzees increased gradually with age, and the increase appears to continue beyond the onset of puberty, as in humans. This provides the first evidence for a prolonged period of prefrontal connection elaboration in great apes

義務教育段階における「課題ゲーム」を用いたサッカーカリキュラムの提案 : 体力向上も目指して

This study shows the curriculum plan of soccer (football) by means of "the task game" in the compulsory education stage. This curriculum plan is intended that the all children are wearing a good sport, it is possible to be familiar with the sport throughout their life, was also contemplated improvement of physical fitness. This is what the Ministry of Education, Culture, Sports, Science and Technology requests it corresponds to the device of the teaching method to which physical fitness increasing as a result of study in all kind of the sport regions