90 Sr is an important heat-releasing nuclide in fragment solution. Separation of 90 Sr from fragment acidic solution can greatly reduce the cost of subsequent treatment of radioactive waste liquor. However, the separation of 90 Sr from fragment acidic solution is a very challenging task.

Ultra-fine cemented carbide made of ultra-fine tungsten carbide powder has high strength and high hardness, which effectively solves the contradiction between hardness and strength of traditional cemented carbide. It is widely used in the manufacture of integrated circuit board micro drill bits and dot matrix printing. The table machine prints needles, precision tools, difficult-to-machine materials, woodworking tools, medical drills, etc.

Tungsten disulfide is a typical layered compound with graphene-like structure. The atoms in the layers are bound by strong covalent bonds, and the van der Waals force between layers is weak. Tungsten disulfide has special mechanical, optical and electrical properties due to its unique structure. Therefore, tungsten disulfide nanomaterials are not only widely used in lubrication and wear fields, but also in catalysis (such as visible light degradation of organic pollutants, visible light hydrogen production, electrocatalytic hydrogen production), lithium batteries (such as anode materials), photoelectric conversion (such as light emitting diodes, solar cells) and other fields. A wide range of attention has been paid by scientific researchers.

Isothermal die forging is a method of achieving die forging at a slower forming speed while maintaining the mold and the workpiece isothermal. Since the workpiece is deformed at a low strain rate at a high temperature, the deformed material can be sufficiently recrystallized. Therefore, the influence of work hardening can be overcome, and therefore, it is very suitable for forming a part with complicated structure and high strength.

Biomass combustion is considered as one of the alternatives to fossil fuels, which can reduce carbon dioxide emissions. In the world, many countries have put forward clear objectives for the development of biomass fuels. According to the medium and long-term development plan of renewable energy in China, by 2020, the total installed capacity of biomass power generation will reach 30 million kilowatts, and the annual utilization of biomass solid briquette fuel will reach 50 million tons. Biomass combustion will inevitably produce nitrogen oxides (NO_x), which will cause environmental pollution.

Tungsten-copper or molybdenum-copper alloys are composites consisting of two-phase mixtures that neither dissolve with each other nor form intermetallic compounds. Tungsten and copper have good arc erosion resistance, weldability, high strength and high hardness. They are widely used in electronic, electrical, military equipment, aviation, aerospace and other new technology fields.

As the fifth generation fuel cell, proton exchange membrane fuel cell (PEMFC) not only has the general advantages of fuel cell, but also has the outstanding advantages of high energy conversion, low temperature start-up, no leakage of electrolytic cell, no corrosion, long life and high specific power. Therefore, the research of PEMFC has become the mainstream of all kinds of fuel cell research.

In the early 1990s, GaN-based blue and purple light emitting diodes (LEDs) were first developed by Nichia Company in Japan, which made it possible for full-color LED display and semiconductor lighting. White LED has many advantages, such as all solid, cold light source, long life, small size, high light efficiency, good weather resistance and no mercury pollution. It has been widely used in lighting, display, automobile and other fields.

Tungsten disulfide is a typical layered transition metal disulfide with van der Waals force interaction between layers. Nanostructured WS₂ can be used in solar cells and field-effect transistors because of its enhanced catalytic performance, excellent optical conductivity and excellent friction properties.

Tungsten trioxide has excellent performances in electrochromic, catalytic and gas sensitivity. Tungsten bronze, a composite oxide of tungsten bronze, generally refers to metal oxides with deep metallic luster, and is usually metal conductor or metal semiconductor. Tungsten bronze general A_xWO₃, however, varies with the type and molar number of cations. The structure and color of the compounds will vary with the different values of A and X.