The water emulsified fuel means that fuel is mixed with water and stabilized by surfactant. The fuel is expected to improve of Diesel engine performance. After the fuel is injected in cylinder, each fuel droplet is heated rapidly and bursts a lot of pieces due to the difference of both boiling points, namely dispersed water in fuel droplets reach boiling point earlier than fuel, so the vaporized water has driving power for bursting fuel droplets. It is called secondary atomization. In order to reduce toxic emission and improve thermal efficiency, secondary atomization is important for spray combustion. The water content in a water emulsified fuel droplet affects behavior of secondary atomization. However, it is determined empirically. This research focuses on timing and atomization behavior of a water emulsified fuel droplet. Namely, statistical evaluation of a water emulsified fuel droplet is proposed. The test method avoid heat transfer from inside of fuel droplet, because of without suspending wire. This research aims at statistical evaluation to determine suitable water content for practical use of water emulsified fuel.

In the present study, the action point, direction, and severity of the required force on the knob in a compass for drawing a circle with a uniform thickness and dark line on a paper are analyzed. In this paper, as the analysis model, the structure and mechanism of the compass are presented. Further, for the analysis, the coordinate system is set in the compass. Analysis models are built based on the set coordinate system. Two cases of ideal and unideal forces acting on the compass are considered in the analysis models. When the ideal force is applied on the knob, a circle with a uniform thickness and dark line is drawn on the paper. When the unideal force is applied on the knob, a circle with a non-uniform thickness and light line is drawn on the paper. Based on the analysis results, experimental tests are conducted regarding the built analysis models. Moreover, the suitability of the analysis models is examined by comparison of the experimental and analysis results. The analysis results show that the drawing of a circle with a uniform thickness and dark line is influenced by the action point, direction, and severity of the force acting on the knob in the compass.

The ceiling-mounted type air conditioner is widely distributed in the market for stores and offices. There are several types, square shape with four blowing outlets per side is very popular type. Generally called "four-way ceiling cassette type" and this product occupies about 60% of the Japanese market.

This product are installed at the approximate center of the ceiling at in a room. It circulates air to the whole room.

Because the outlet is in four directions, the air blow is also every 90 degrees, and it becomes a blind spot on the every 45 degree direction. It is causing temperature unevenness in the room and a sense of draft. Therefore, it impairs comfort and also deteriorates energy saving. In order to solve these problems, we devised a new structure of air conditioner based on analyzed the current "four-way cassette A/C". In addition, the actual machine was manufactured and the air flow was analyzed to confirm the improvement effects.