Application of 1,3-PDO, Production of 1,3-PDO
1,3-PDO is the monomer of polytrimethylene terephthalate.
It is widely used as the raw material of cosmetics, food, textile, lubricants, and medicines.
The yield of chemical method to produce 1,3-PDO is low, and there are many by-product by using chemical production of 1,3-PDO. As a result, it is difficult to produce 1,3-PDO by chemical method.
To prevent silicon from agglomerating
→ should cool the solid quickly
Rapid cooling
→ large thermal gradient in crystal
Postulate K=20W/m K
Diameter of wafer: 10-20 cm
L (latent heat of fusion) = 340 cal/g
Temperature gradient in silicon CZ (dT/dx) : 100°C/cm
Target
University students
Middle aged (20~40) employees
Occasional coffee lovers
Why?
Majority consumers of coffee
Middle aged and older people frequent coffee shop the most
Providing an alternative high quality Espresso Coffee to Instant Coffee which coffee lovers would like
Busy and packed schedule
Our Espresso Machine is designed to replace the current method of brewing coffee in a
It is 7:14 P.M., Monday, September 22, 1975, and we are watching the network news programs on CBS, NBC, ABC and UBS-TV, the network of our story. The AUDIO is OFF; and head shots of WALTER CRONKITE, JOHN CHANCELLOR, HOWARD K. SMITH and HARRY REASONER, and of course, the anchorman of our network, HOWARD BEALE, silently flit and flicker across the four television screens, interspersed with the news
A high AERIAL SHOT of the island features the Statue of Liberty prominently in the foreground then TRAVELS ACROSS the harbor, OVER the Battery and Lower Manhattan to Greenwich Village.
EXT. EAST 77TH STREET - DAY
A car is being hoisted up by a municipal tow truck while its owner is having a terrible screaming argument with a parking enforcement officer. DANA BARRETT comes home pushing a baby bugg
1. 경피적 간담관 배액(Percutaneous transhepatic biliary drainage: PTBD)
1) 경피적 간담관 배액은 수술이 불가능하거나 수술의 위험성이 높은 환자에게 간, 췌장 담관 등의 암으로 인한 담관의 폐색을 완화시키는 방법이다. 이 방법을 통해 담즙을 십이지장으로 쉽게 통과시켜서 황달과 불편감을 감소시킬 수 있
5) X-선관의 주요 성능지표
① 관전압 인가 최대 전압 뼈 등과 같이 밀도가 높은 부분 두꺼운 부분을 촬영할 때는 높은 관전압이 필요 : ,
② 관전류 인가최대전류며 단위 관전류가 크면 필라멘트에서 더 많은 전자가 방출되고 따라서 저지극에 충돌하는 : mA ,
전자의 수도 증가하여 방출되는 선량이
기도흡인
· 스스로 호흡기계의 분비물을 배출하지 못하는 환자에게 흡인기구를 이용하여 축적된 분비물을 제거하는 과정
* 종류
· Oral, Nasal, Endotracheal --- 청결유지
· Tracheostomy --- Aseptic technique 유지
* 목적
· 분비물과 이물을 제거시켜 기도를 유지한다.
· 분비물로 인한 감염이나 무기폐등
We can’t live without energy and most of that energy comes from fossil fuels like petroleum, coal, and natural gas. It is well known that human activities, such as burning fossil fuels, cause global warming, increasing the overall temperatures of the earth. Other than environmental concerns, fossil fuels are becoming more expensive and will eventually run out. So, we need to find ‘alternative