◎압전기 효과
압전기 효과에는 압전기 직접효과와 압전기 역효과가 있다. 전자의 압전기 직접효과란 압전소자에 외부응력, 진동변위 등을 가하면, 그 출력단에 전기 신호가 발생하는 현상을 말한다. 또한 후자의 압전기 역효과란 압전소자에 외부로부터 전압을 가하면 소자가 기계적 변위를 일
3.2.The first product (2007 - present)
3.2.1.Main article: Mastretta MXT
Mastretta (est. 1989) first announced production of their MXT through Automóvil Panamericano magazine in May 2007. Even though up to a year will have passed, September 2008 will see the production version of the first ever fully Mexican designed and engineered serial-produced sports car, the Mastretta MXT, an automo
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.
SLA - Stereolithography
An additive manufacturing process by curing a photo-reactive resin
Liquid ultraviolet curable photopolymer and an ultraviolet laser to build layers
T
of 800*800mm2 in cross-sectional area and 1800mm in depth.
V-shaped promoter were located on the test surface 1200mm downstream from the plate edge.
*Measurements
Promoter : the length of the side B, the height H, the attack angle α
B=20mm(fixed) / H=2.5,5,10,20 and 30 mm / α=180,150,120,90,60 and 30 degrees)
2-3. Results & Discussion
When α=90° and H=10 mm is the optimal condition.
of 388,500 in August 2006. As of 2008, it has an estimated readership of 1.23 million.
- publishes two other English-language dailies - the broadsheet Business Times and The New Paper tabloid, as well as the bilingual my paper.
Asiaone
- is a free-access, one-stop information mall which serves users’ news, business and lifestyle needs.
- Within the all-encompassing portal are unique co
2. Inhibition
ⓓ sets of defenses to protect one's ego
○ Meaningful L acquisition involves some degree of identity conflict
○ It is related to "Self-esteem" (Self-esteem↑ Inhibition↓)
Inhibition이란 자신의 ego를 보호하기 위한 방어기제(defenses)를 지칭하는데, 자신의 신념이나 느낌이 쉽게 깨지기 쉬운 청소년기에 많이 형
appreciable increase
in heat transfer rates
Present authors have proposed a unique type of promoter : "V-shaped" is the best.
And they experiment to find adequate "height and angle"
2-2. Experimental Apparatus and Measurements
*Apparatus
- heat transfer plate and side plate
- V-shaped promoter(1mm thick vinylchloride resin plate)
- fluid : water
The whole apparatus was submerged
1)waste of package source material
2) burden increase of cost of transport
3)environmental pollution increase
▶9 out of 15 gift set products has exceeded packaging space ratio
▶waste of resources + environmental pollution+ Total cost↑
▶Difficult to recycle due to the use of complex materials of fabric, synthetic resins and paper.
resin 두 개의 다른 chemical을 합성해서 만드는 copolymer로써 resin(수지)라 부르는데, 이 resin의 양끝에는 C 두 개와 O 한 개를 포함하는 epoxide group이 달려 있다. 아래 그림은 epoxy resin의 구조이다.
위의 그림2는 polymer에 glass fiber(빗금친 부분)가 연결되어 있는 모습
우리 실험에서 epoxy resin이 glass fiber로 reinf