radius or diameter are equally valid for spheres or circles, but one is chosen by convention. For aircraft or ships, the length or width can be used. For flow in a pipe or a sphere moving in a fluid the internal diameter is generally used today. Other shapes (such as rectangular pipes or non-spherical objects) have an equivalent diameter defined. For fluids of variable density (e.g. compressible
artificial.
hazard
→ Dangerous or threatening situation. Situation of potential threats. The current nature
danger
→ Possible to predict exposure but already faced losses. many used in the sense natural.
uncertainty
→ Attributes a series of incidents that take place via a variable that can not be predicted with. The intensity of the higher risk of uncertainty is also high.
1. Put sample in Graphite crucible and make Vacuum
2. Start to Increase temperature at 100torr
3. Heating rate: 10 ºC/ min
4. Temperature up to 950 ºC
5. Time variable: keeping 1 hour and 30 minutes
1. Preparation of Speci
men parallel with hol
der
2. Put Specimen perpen
dicular to the Diffract
ometer axis
3. Θ-2Θ sacn with X-ra
y target : Cu
Controlling aperture size related to the amount of electrons.
As aperture size changes
1. Probe convergence angle
2. Probe current
3. Probe diameter
The portion of a scene that appears acceptably sharp in the image.
Easily speaking, range in focus.
D.O.F is in inverse proportion to
radius of aperture size(RAP) (WD: Working distance)
radius와 grid의 범위를 매우 다양하게 지정함으로써 무수히 많은 경우를 반복하여서 시행착오법을 통하여 가장 작은 안전율을 산정한 반면에 수계산의 경우는 한가지의 경우만에 한정되어서 안전율을 구하기 때문에 오차가 발생할 수 밖에 없다. 따라서 대부분의 경우 수계산이 안전율을 과대평가하게