1. Path for lines of magnetic force
2. Improve the stability of magnet
3. Prevent the magnetic field bending
4. Reinforce the magnetic field
“How can we make
magnetic field about 1~5 kOe
using permanent magnet?”
“Let’s solve some Calculation”
YokeDesign
“York design method”
methods that can be measure Young's modulus with reliability and reappearance are needed to develop the new materials i.e. composite and thin film materials.
In general, there are two methods to measure the Young's modulus. The first one is called the 'static method' that is the way to measure the deformation strain that are corresponded to applied force using the strain gage. In other way, 'k
● Definition of plasma
Plasma is one of the four fundamental states of matter, along with solid, liquid, and gas. It is an ionized gas consisting of a collection of charged particles, including ions, electrons, and neutral atoms or molecules. Plasma can be found naturally in the universe in the form of stars, lightning, and auroras, but it can also be artificially created and controlled for
Introduction (What is plasma?)
1. Definition of plasma
Plasma is one of the four fundamental states of matter, along with solid, liquid, and gas. It is an ionized gas consisting of a collection of charged particles, including ions, electrons, and neutral atoms or molecules. Plasma can be found naturally in the universe in the form of stars, lightning, and auroras, but it can also be artif
Synthesis
Grafting onto
“Grafting-onto” involves the chemical reaction preformed, functionalized polymers with surfaces containing complementary functional groups
Grafting from
‘‘Grafting-from’’ involves an in situ polymerization of an initiator functionalized surface with monomer.
Grafting onto
“Grafting-onto” involves the chemical reaction preformed, functionalized p
What is Bioenergy?
Bioenergy is renewable energy made available from materials derived from biological sources. Biomass is any organic material which has stored sunlight in the form of chemical energy. As a fuel it may include wood, wood waste, straw, manure, sugarcane, and many other byproducts from a variety of agricultural processes.
So, Why do we produce Bioenergy?
One reason governments
Summary
Concept of ‘Economies of Scope’
Economies of scope are cost advantages that result when firms provide a variety of products rather than specializing in the production or delivery of a single product or service. Firms with economies of scope curtail the cost of production through utilizing common platform
There are four methods of economies of scope : M&A, related diversificat
그림 Al 방열판
1) 알루미늄 & 알루미늄 합금
그림 Cu 방열판
알루미늄은 밀도가 낮고(2.7g/cm3) 열전도도가 좋아 방열 재료로 사용되기에 유리하며, 실제로도 흔히 사용되는 금속원소다. 순수 알루미늄보다는 알루미늄 합금이 일반적으로 사용되며, 열전도도가 크지만(229 W/m‧K) 가공성이 좋지 않
AlN의 형성은 열역학적으로 자발적인 반응
In-situ Al/AlN 복합재
알루미늄의 높은 열 전도도를 유지
열 팽창계수의 감소
비강도 증가
복합재의 제조 원가 절감
최대 50 wt% AlN이 형성되었음 R.G. Reddy et al (2007)
수 마이크로미터 크기의 AlN 입자 형성
AlN이 용탕의 상층부에 집중적으
(1) 응력(Pa) : 인장기기와 연결된 소프트웨어에서 얻은 시간에 따른 하중 P(kgf)를 사용하여 SI단위 하중 P(N)로 나타내기 위해 하중 P(kgf)에 9.8m/s2를 곱한다.
실험 전 측정한 너비와 두께 치수를 이용하여 A0를 구할 수 있다.
응력 (N/m2)
(2) 변형률 : 실험 중 10초 간격으로 촬영한 사진을