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For effective use of solar energy, it is important to maximize power generation per installation area. In this paper, photovoltaic (PV) modules assembled in a three-dimensional structure are proposed to enable more efficient conversion of limited amounts of solar energy using low-cost solar cells. The proposed PV modules are tree-shaped. We show using simulations that these modules produce significantly...
A new direct methanol fuel cell with a zigzag-folded membrane electrode assembly is proposed. The fuel cell can achieve high output voltage through a simple in-series connection. The problem of fuel supply, which causes decreased output voltage, is examined. For the capillary action fuel supply method, a 4 mm thick filter paper was sufficient to supply fuel to the cell for 1 h operation. To curb the...
IEEE abstract currently, most outdoor illumination sources use high intensity discharge (HID) lamps as light sources. Global concerns have been raised regarding the amount of power consumed by HID lamps, and by extension, the amount of atmospheric CO2 released due to such power consumption. Because of this, light emitting diod (LED) array illumination has received attention recently as an energy-reducing...
A new type direct methanol fuel cell (DMFC) which has high flexibility was investigated. A new current collecting method has been proposed, which involves sewing wire to the electrode, and this was examined in an attempt to decrease the contact resistance. The difference in output was examined by dividing the electrode into nine. The cell output characteristics were studied using different fuel concentration...
This paper reports a simulation method for output degradation when spot dirt adheres to a small photovoltaic module. A small photovoltaic module of 13 W was applied to various electric systems. The module consisted of 34 single crystal silicon photovoltaic cells, cut to 1/4 the silicon single crystal photovoltaic cell of the square whose one side is 103 mm. The power generation output degradation...
A method for leveling power generation was examined for a power supply system that uses wind power generation for a stand-alone radio base station. One such possible method is to convert the surplus electric power to hydrogen, which enables stable energy storage that can be later used to produce electrical energy via a fuel cell. In order to efficiently produce hydrogen from wind power, it has been...
This paper reports the output degradation reduction when spot dirt adheres to a small photovoltaic module with rectangular cells. A small photovoltaic module of 13 W was applied to various electric systems. The module consisted of single crystal silicon photovoltaic cells. The effect of the output degradation was studied by changing the aspect ratio of the photovoltaic cell. It was also studied the...
One of the most important issues related to thin-film SOI power MOSFETs is how to improve their high-frequency switching performance. Reducing the product of on-resistance (Ron) and output capacitance (Coss) by shrinking the design rule is an effective way to improve it. However, it has a limitation because it pronounces the parasitic bipolar effect which degrades the high-frequency performance and...
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