Tungsten filament was
heated to generate electron.
Revolving 270, the electrons
are directed by
electromagnetic field
resulting collision onto the
source surface
After heated to certain
degree, source gas was
generated
The sensor monitors the
thickness of deposited film.
High vacuum should be kept in
the chamber not to contain
oxigen
gas which damages
substrat
1. Pump에서의 Cavitation (공동현상) 에 대하여 기술하고 이로 생길 수 있는 문제점과 그 방지책에 대해 논하시오
- Cavitation이란
유체가 넓은 유로에서 좁을 곳으로 고속 유입하거나 벽면의 요철, 만곡부 등으로 흐름이 직선적이지 못할 때 유체는 저압이 되고 포화증기압보다 낮아지면 기화되어 기포가
General Process of 3D printing
FDM - Fused Deposition Molding
FDM works on an "additive" principle by laying down material in layers.
The model is produced by extruding small beads of thermoplastic material to form layers as the material hardens immediately after extrusion from the nozzle.
The nozzle can be moved in both horizontal and vertical directions by a numerically controlled mechanism
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
1. What is the "Hedge Fund"
1.1 What is Hedge Fund?
1.1.1 Definition of the "Hedge Fund"
1) What is a hedge fund?
"Hedge fund" is a general, non-legal term that was originally used to describe a type of private and unregistered investment pool that employed sophisticated hedging and arbitrage techniques to trade in the corporate equity markets. Hedge funds have traditionally been limited t