The 880 thousand won generation
Kim Ji yeong, an ordinary Korean woman who graduated from college in Busan in the year 2003, was never able to get a permanent job. After graduating she became a labor worker under contract which was the position of a secretary for a steel company. However, she was excluded from the list of people who were to be promoted to permanent job when the revision of the L
factor), D(Dissipation factor), Y(어드미턴스), 위상(Phase)등의 값을 말한다.
■ LCR Meter의 사용
개별소자의 특성값을 알고 있더라도 소자의 임피던스를 다시 측정해야 한다. 그 이유는 개별소자의 정격 수치에는 포유(parasitics) 성분이 포함되어 있으며, 소자의 총 임피던스값에는 알고있는 값 이외에, 리드의
factor, Q, following the expression △f=f/Q. The quality factor quantifies the energy dissipation and is defined as the ratio between the mechanical energy accumulated and dissipated per vibration cycle. Under liquids environments, the quality factor shifts toward much lower values than in air, due to the damping effect of the viscous surroundings, which decrease abruptly the overall sensitivity
경우 상당길이를 고려해 줘야하는데, 이번 설계 프로젝트에선 총 4개의 90° Standard elbow를 사용하였다.
Type of fitting
(L/D) ε
Standard 90° elbow
30
Square 90° elbow
70
Standard "T"
(through side outlet)
70
45° elbow
15
※ valve, elbow ~ Fluid flow & direction change
-> 난류유발, 압력강하, 마찰소산(friction dissipation)
Able to dissipate limited amount of heat flux.
Lower coefficient of performance than vapor-compression systems.
Relegated to low heat flux applications.
More total heat to remove than without a TEC.
▪ Mini contact : TEC – Silicon Chip
▪ Concentrating the TEC Power on a Small Area
▪ TEC with 20μm-thick Bi2Te3
▪ 10W
▪ 1250μm x 1250μm Copper Mi