두 용액 혼합 후 Ar gas 주입 (30min) 용액 중 산소 제거
안정제로 poly(N-vinyl-2-pyrrolidone) [PVP, Mw = 10000]을 5% 농도로
isopropyl alcohol에 녹여 500mL
0.1 M AgNO3 500 mL
D : 계산된 입자의 크기
K : 상수= 0.9
λ : 측정에 사용된 X-선 파장 [ * 본 실험 1.541 A]
Β : 회절선의 full width at half maximum [ * 0.08]
Θ : 측정
P u r p o s e
To understand XRD and analysis JCPDS card, we analyzed and studied the figure of XRD and did research and discuss background knowledge. Also we expect that we can find important information of XRD by doing experiment
Process of experiment
XRD is equipment that use characteristic X-rays. Through characteristic X-rays diffraction peak of material, we can examine closely unk
Purpose of Experiment
Understanding experimental
analyzing method from XRD
Understanding
application of XRD
Understanding
Principle of XRD
Understanding and analyzing of XRD perfectly
Reason of Error
Impurities
Sample
Rough surface
→ Having to fix x,y,z axis
Non uniform powders
→ Changing surface
Geometrical structure factor
High stress
→Distortion, screw.
2) Activity(coefficient)
실제용액과 이상용액과의 차이를 보정해주기 위한 것이 활동도(activity)이며 표시는 다음과 같이 한다. ϒi를 activity coefficient라고 한다.
fi/xifi = ϒi
fugacity를 가지고 일종의 유효 압력을 나타냈던 것과 비슷하게, 활동도 activity는 일종의 ‘유효’ 몰 분율을 나타낸다. 실제 용
analysis was conducted. From the acquired spectrum Fig.3b, the particle was identified as another Nb precipitate. Prior to this study, it was certain that Nb precipitates as particles above 50nm in steel, but identifying precipitates below this size was not clarified. However, from this analysis conducted on carbon extraction replicas using an FE-SEM, it was proven that Nb can indeed precipitate
Parameter Wilson식을 제시하였고 Renon 과 Prausnitz는 Scott의 two liquid이론과 Guggenheim의 quasi-chemical theory에 local area fraction 개념을 도입하여 UNIQUAC(Unversal quasi-chemical)식을 제안하게 된다.
우리는 이러한 많은 국부조성개념에 근거한 식들 중에서 Wilson식과 NRTL(Non-Random Two Liquid)식을 사용하기로 결정하였으므로
Abstract
The main topic of our project is to design a personal transportation that better accommodates the environment. Since Korean mothers are experiencing difficulties with using baby transportation in metropolitan areas, our team resolved to construct a baby stroller that is compatible with the Korean mass transportation system. Our final concept is composed of a stroller that single-hande
해동을 하는 본 단계에서는 병원균(L. monocytogenes)의 오염이될 가능성이 있는데 이는 생물학적 위해요소에 속하며, 해동 시 균의 번식 혹은 교차 오염에 의하여 발생할 수 있다. 본 단계에서는 온도를 제어함으로써 이러한 위해요소를 관리하게 된다.(실내 온도 16℃ 이하, 품온 5℃ 이하)
이러한 온도 제