Photoelectrochemical cells (PEC) decompose water to produce hydrogen to convert solar energy into chemical energy. It is considered to be a feasible solution to replace the current fossil fuel based energy. Semiconductor material is an important research direction in this field.

3D printing technology is also known as additive manufacturing. The use of this technology to manufacture metal parts is somewhat the same as the traditional powder metallurgy. They both use powder material such as ceramic powders and metal powders. The difference is that the material powder is not joined by sintering, but is formed by using a special adhesive to "print" the cross section of the part onto the material powder.

When an aircraft is flying, its balance will affect the controllability, performance and safety of the aircraft. It is important to maintain a stable center of gravity for optimal control and compliance with flight safety standards. It is important to distribute the weight to allow the aircraft to be balance after considering the weight of onboard equipment, passengers and fuel. In order to achieve this process, it is necessary to temporarily or permanently install the counterweight.

The single crystal blade is a cast blade with only one oriented crystal grain, which eliminates the lateral grain boundary sensitive to voids and cracks, so that all grain boundaries are parallel to the stress axis direction, thereby improving the performance of the alloy. In the past 60 years, single crystal turbine blades have been critical to the development of jet engines and have been an important technology for the development of the aircraft industry.

Tungsten disulfide (WS2) is a silver-gray lubricant powder, with an extreme low friction (COF: 0.03) and excellent thermal stability and pressure resistance. When coated on a substrate, it forms a 0.5 micron thick layer of WS2 coating, which reduces the friction and increases thermal stability and pressure resistance of it. Here are   four coating methods to apply WS2 powder:

Microporous ceramics are a kind of silicate products. The raw materials used are barren clay, waste slag, power plant fly ash and glass plant waste, which will play an important role in protecting the environment and saving resources. Microporous ceramic is a functional structural ceramics. Microporous ceramics, such as adsorbability, permeability, corrosion resistance, environmental compatibility and biocompatibility, are widely used in the filtration of various liquids, filtration of gases, and immobilization of biological enzyme carriers and biocompatibility carriers, especially in environmental engineering, such as industrial water and domestic water treatment, The purification of sewage and so on.