Greens and Browns
Materials to Avoid in Your Compost Pile
How to Store and Add Materials
Greens
(materials rich in nitrogen) Browns
(materials rich in carbon)
From Your garden
Greenplants
Garden trimmings
Fresh leaves & flower
Grass clippings
From your Kitchen/Home
-fruit & vegetable scraps
-coffee grounds & tea bags
-manure & bedding from plant eating animals ONLY
Definition
: compounds that have some antimicrobial activity
from nature source
① plant origin
green chemicals
Spices and herbs are well known to inhibit
bacteria, yeasts, and molds.
② Microbial origin
Biopreservatives
main stream field of study is the use of
lactic acid bacteria(LAB).
Definition
host-synthesized, l
plant & house
Inefficient usage of electricity
Obama government is focusing on teleworking, e-health, promoting the smart grid
Plan「Save Energy Now」
In terms of National development strategies
Energy efficiency, intelligent transportation and logistics,
Environmental Monitoring and Prediction
England : Leader of Green IT by government
- securing 100% carbon neutral of public IT
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