2000 B.C - The first recorded (The Susruta Samhita, Sanskrit writing) water purification began with the Egyptians. It is said that impure water should be boiled over a fire, heated in the sun, have a hot iron dipped into it or purified by filtration through sand and course gravel.
A major step in the development of desalination technologies came in the 1940s during World War II when various m
1. Introduction
1) Definition of preservation and food-spoilage micro-organisms
Food preservation is the process of treating and handling food to stop or greatly slow down spoilage (loss of quality, edibility or nutritive value) caused or accelerated by micro-organisms. Some methods, however, use benign bacteria, yeasts or fungi to add specific qualities and to preserve food (e.g., cheese, wine
Flow around and through fish gills
Jeesoon Choi and Dongyeop Baek
School of Mechanical and Aerospace Engineering, Seoul National University
Abstract. An overall view of the flow over the fish gills is first described by using the active pump system and the passive ram ventilation. The concept of ram ventilation is introduced and its merits of reducing hydrodynamic drags and efficient e
1. 서 론
인공투석이란 신장이 그 기능을 충분히 발휘하지 못할 때 인공적으로 혈액중의 노폐물을 제거하여 깨끗한 혈액으로 바꾸어 내보내는 방법이다. 신장은 과잉 섭취된 물과 단백질 대사 결과 생성되는 질소 대사 노폐물을 분비하고, 혈장의 산·염기 평형과 전해질 농도를 조절하며, 내분비기능
인해 피에조미터에서는 h=만큼 물이 상승한다. 이는 가해진 외부 하중을 전부 물이 받기 때문이다. 이와 같이, 외부 하중으로 인해 간극수에 작용하는 압력을 과잉 간극 수압(excess porewater pressure)이라 하며, 물이 배출되기 직전인 하중 재하 순간의 과잉 간극 수압을 초기 과잉 간극 수압이라 한다.
pore region
A large amount of amine-type CO2 capturing agent into its mesopores in a well dispersed manner
Synthesis of MA
PEI impregnation on MA
Amine grafting on MCM-41
Characterization of the materials prepared
CO2 adsorption-desorption measurement
Al(i-PrO)3 (41.68g)+ Alcohol solvent
(EtOH 73.6g + isopropanol 72.2g) at 50oC
Distilled water (7.2g) – promote hyd
Water사의 Styragel, Phenomenex사의 Phenogel, Showa-denko사의 Shodex가 유명하다. 컬럼은 보정곡선(calibration plot)을 그린 후, 측정구간에서 retention time vs. 분자량의 calibration plot이 얼마나 linear한지를 보면 컬럼의 성능을 판단할 수 있다.
THF, DMAc, chloroform, toluene 등의 지용성 용매외에 물을 사용하고자 하면, 수용성
water, HFIP 등 사용
6) Oven
컬럼과 검출기는 같은 온도를 일정하게 유지시켜주는 장치
7) 검출기
고분자가 컬럼밖으로 유출되는 것을
감지하는 장치
-종류
•시차굴절률 검출기(fluorescennce detector)
• 형광 검출기(electrochemical detector)
• 전기전도도 검출기(electric co
pores.
Youre going to be late. lts almost seven oclock.
You bum! Three million dollars a year! For what?
Come on. Just one more out.
- Barry Neufeld. - Hi, its Rose.
Hi ... Not again.
l think its an allergic reaction to something l ate.
- My throats starting to close up. - lt sounds like youre dying.
- Sure youre not allergic to me? - Thats a terrible thing to think!
Every Manhattan restaurant ha