②White emission using mixtures of CdSe quantum dots and PMMA as a phosphor
This paper explain WLED that have mixture stucture (one single chip(emit blue light) and cdse/PMMA quantum dots). CdSe quantum dots are synthesized by the wet chemical method using CdO and Se powder as precursor. And they control the size of quantum dot and mix the phospors(PMMA).
These quantum dots have three differe
1. 차세대 엔진의 현황
위기 뒤에는 기회가 찾아온다고 했던가.
산업혁명의 기원에는 우리가 알지 미처 알지 못한 숨겨진 사실이 있었다. 인류에게 유래 없는 물질적 풍요를 안겨준 산업혁명, 그 산업혁명을 촉진하게 된 계기는 16세기 중엽 이후의 목재 자원의 고갈이었다. 이 연료 위기를 극복하
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
in motion for Climatic Change Convention (CCC). And developed countries started to regulate the standard related to environment in many industries.
There are many contributors who are dealing with environmental issues and car industry is one of industries that the mostly challenged by forces in the world. Particularly, cars take part significantly in air pollution because of the fuel emissions.
Water stress results from an imbalance between water use and water resources. The water stress indicator in this map measures the proportion of water withdrawal with respect to total renewable resources. It is a criticality ratio, which implies that water stress depends on the variability of resources. Water stress causes deterioration of fresh water resources in terms of quantity (aquifer over-e