1. 실험 목적
조성에 따른 Cu와 Cu-Sn의 특성 변화를 알 수 있다.
2. 이론 조사
2.1 분말공정(Powder Metallurgy) : Cu+Sn(10wt%Sn)
금속분말을 가압 성형하여 굳히고, 가열하여 소결함으로써 목적하는 형태의 금속 제품을 얻는 방법이다. 비교적 간단한 공정으로 원하는 형상의 제품을 만들 수 있다. 주조(casting)
II. How is CBM formed
Coalbed methane (CH4) forms in one of two ways. During the earliest stage of coalification (the process that turns plant detritus into coal), biogenic methane is generated as a by-product of bacterial respiration. Aerobic bacteria (those that use oxygen in respiration) first metabolize any free oxygen left in the plant remains and the surrounding sediments. In fresh water
4) Whatever customers want.
There are 25 suite rooms in the hotel and one butler is involved in each suite room. These butlers are always ready for the customers. For example, all kinds of foods are prepared so customers can select whatever they want. The customers just let butlers know to reserve the best quality restaurant in Milan a day before. Moreover, an opera that has to be reserved at le
⑤ 오염균수를 적게 할 수 있는 방법
- 고기표면을 다듬어 제거하여 표면의 오염균을 줄임
- 냉장고 안을 청결히
- 작업기구, 용기 특등의 고기 찌꺼기를 제거, 세척, 차아염소산용액으로 소독
⑥ 식육제품의 위생
- 저온성이나 내염성의 세균에 의해 각종 변패
- 햄 제품 : Bacillus가 가장 많다.
3. Experiment Method
A measurement method of sample of powder form is an x-ray diffractometor(Fig. 9).
Fig. 9. An x-ray diffractometer.
3.1. Making of Sample Powder
A Sample is made a powder form. A diameter of powder has good reproducibility as smaller. But generally 10~35μm is a suitable size of sample. We must caution a deterioration by air, gas, humidity and pouri