The fuel cell is a proton exchange membrane fuel cell. It directly uses methanol aqueous solution or hydrogen as a fuel supply source to generate electricity. It has the characteristics of quick start at low temperature, environmental friendliness, and simple battery structure. It is an efficient green energy source.

Probably the most well-known outlet for tungsten alloys is the aerospace industry, where weights and counterweights are often required to be housed in restricted areas. With significant reductions in size possible, this in turn, leads to greater control of weight distribution. 

Cadmium selenide nanocrystal is the most widely studied and most promising II-VI semiconductor nanocrystals. Due to its important nonlinear optical properties, luminescent properties and other physicochemical properties, it is considered as a material with great and widely application in the future.

In some situation, we need some special things to add weight in sailboat. But the space for the special things usually very small. For example, the sailboats, if the sailboats weight is not enough, it can turn turtle easily, especially when moving in a wind weather. So, we need add some tungsten alloy counterweights into the sailboats to against the yawing when sailing forward.