Irrigation was generally not necessary, but drainage systems were often needed to remove excess water.
Until the late nineteenth century, Finland's isolation required that most farmers concentrate on producing grains to meet the country's basic food needs. In the fall, farmers planted rye; in the spring, southern and central farmers started oats, while northern farmers seeded barley. Farms also
A Sustainable City
Providing the highest quality of life with the lowest environmental footprint
100% Renewable Energy
Zero Waste
Net Zero Carbon
Fossil Fuel Free Zone
What is hunger?
3 Types of Poverty
Extreme poverty
Less than 2,100 calories a day, Number 1 risk to health
Median of the poverty
Income of 1-2 U.S. dollars per person per day
Relative poverty
Household refers to income levels lower than the average
Situation in Kenya
Experiencing one of the worst droughts in recent years.
Up to 3.5 million people are affected
Introduction
Motivation
에어컨과 같은 냉방 시스템이 없던 과거에는 어떻게 더위를 식혔을까?
신라시대 사람들은 더위를 식히기 위해 석빙고를 이용했었다.
석빙고에 얼음을 저장해 놓은 후 이를 이용하여 더위를 식힌 것이었다.
하지만 현재는 눈부신 과학기술 발전에 힘입어 선풍기, 에어컨 등의
Tidal stream generators (TSGs) make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use moving air.
A TSG is a machine that extracts energy from moving masses of water, or tides.
Energy can be captured from tidal streams using two methods,
Tidal fences and Tidal turbines.
Dynamic tidal power or DTP is a new an