insulating current from the users would be essential. Lastly, the noticeable distance of LED when it is lighted should be measured. We also considered about types of LEDs, straight light direction LED, whole direction LED, and EL sheet. Each of these three types had advantages, however the main fact we considered was visibility. So before making prototype, we tested 3 types of LEDs by using gener
size formation
↓
Thin layer is maintained
uniformly
▼ View from Above
A large number of
compact pipes
Make the
Surface area Larger
▼ View from Side
Fin
Thin and insulated panel
Fix the pipes
make cooling space with air
between the fins
Titanium
Light weight↓
High thermal conductivity↑
High strength↑
High corrosion resistance↑
piezoelectric size should be approximately 3X5cm as users have to be able to fold and open an umbrella. Piezoelectric should be also coated with materials like vinyl to make it water proof. In order to turn on the LED, 3V of voltage and 20mA of current are needed, so generating enough power would be the most important issue. Furthermore, insulating current from the users would be essential.
Partial substitution of Ba by a smaller M2+ ion
unit cell volume decreases and the phase transition temperature decreases
An insulator at room temperature becomes semiconductive after doping
trivalent donars (e.g. La, Sb, Y) substitute for the Ba2+
pentavalent donars (e.g. Sb, Nb, Ta) substitute for Ti4+.
와인 보관 창고
적정온도 : 7-13도
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