temperatures. For safety reasons, all activities in the RCA clean procedure should be performed in a Clean Station Work Area which is located under an exhaust fume hood.
[Figure 1] RCA cleaning
the RCA clean proceedure consists of the following steps
: Chemical Storage ⇒ Mix Organic Solution ⇒ Mix Ionic Solution ⇒ Mix HF Solution ⇒ Set-Up Bubbler Rinse ⇒ O
Figure 13 shows that cryo pump is cooling pump. It means this pump is cooling, liquefaction and store air, not pumping. Generally, it has 3 processes like condensation, absorption and trap at lowtemperature. The cooled air or molecules do not have any momentum so it is no possibility to heat any molecules. It means vacuum.
Cryo pump have High emission velocity and high emission capacity so it
1. Introduction
1) Definition of preservation and food-spoilage micro-organisms
Food preservation is the process of treating and handling food to stop or greatly slow down spoilage (loss of quality, edibility or nutritive value) caused or accelerated by micro-organisms. Some methods, however, use benign bacteria, yeasts or fungi to add specific qualities and to preserve food (e.g., cheese, wine
3D printing
3D printing or additive manufacturing (AM) refers to any of the various processes for printing a three-dimensional object. Primarily additive processes are used, in which successive layers of material are laid down under computer control. These objects can be of almost any shape or geometry, and are produced from a 3D model or other electronic data source.
Basic principles
If the
염료 감응형 태양전지는 반도체 접합형 태양전지와는 달리, 고체/액체 접합의 광전
기화학형이며 가시광선을 흡수하여 전자-홀 쌍 (electron-hole pair)을 생성할 수 있
는 감응성 염료분자와, 생성된 전자를 전달하는 전이금속 산화물을 주된 구성 재료
로 하는 광전기 화학적 태양전지이다. Fig. 2.2. 에서