Electric valve is a device that drives the valve to open and close by electric motor. It is widely used in various industrial and civil fields, such as metallurgy, chemical industry, petroleum, natural gas, heating, ventilation and air conditioning, automatic control, etc. The following are some application scenarios of electric valves:
1. Fluid control in industrial production: electric valve can be used to control the flow, pressure and temperature of liquid, gas and steam to meet the needs of industrial production.
2. Oil and natural gas industry: electric valves can be used in oil and natural gas exploitation, processing, transmission and storage to control flow and pressure and ensure production safety and efficiency.
3. Chemical industry: electric valve can be used for fluid control in chemical production, such as acid-base solution, gas and liquid reactant control, to ensure the safety and efficiency of production.
4. Heating, ventilation and air conditioning system: the electric valve can be used to control the water flow, air flow and temperature in the heating, ventilation and air conditioning system to meet the requirements of the indoor environment.
5. Automatic control system: electric valve can be used with automatic control system to realize automatic control and adjustment of fluid flow, pressure, temperature and other parameters.
In short, electric valves are widely used in industrial and civil fields, which can improve production efficiency, ensure product quality and improve production safety.
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**Abstract**
American scientists have made a breakthrough in quantum technology by achieving a spin-coherence time of up to 200 microseconds for nitrogen vacancy (NV) centers in nanodiamonds—setting a new world record. This remarkable improvement was made possible through the use of a novel material and advanced particle etching techniques, paving the way for future applications in magnetic resonance probes and quantum computing.
The research, led by Professor Dirk Englund from MIT, focused on creating ultra-pure nanodiamonds using a self-assembled multi-space metal mask combined with reactive ion etching. The resulting nanodiamonds contain no paramagnetic impurities, allowing their NV centers to maintain stable spin states for significantly longer periods than previously achieved. This advancement is crucial for real-world quantum devices, where maintaining coherence is essential for reliable information storage and processing.
NV centers in nanodiamonds are highly promising for next-generation quantum technologies, including quantum computing, nanosensing, and high-precision magnetic field detection. Unlike traditional methods that often result in impure diamonds with short coherence times, this new technique enables the controlled creation of hundreds of millions of NV defects without extensive manual intervention.
One of the key advantages of NV centers is their ability to detect single spins at the nanometer scale, far surpassing conventional magnetic resonance imaging, which requires millions of spins to generate a measurable signal. This makes them ideal for applications such as biological sensing, medical diagnostics, and ultra-sensitive magnetic field measurement.
In addition to their role in quantum computing, NV centers can also be used in photonic structures and as single-photon sources, making them versatile components for quantum communication and information processing. However, despite the progress, challenges remain in stabilizing quantum bits (qubits) produced from these nanodiamonds, as they are still vulnerable to environmental noise.
The study, published in *Nano Letters*, was supported by Columbia University and the City University of New York. Researchers believe this breakthrough could revolutionize the development of quantum technologies, offering more efficient and scalable solutions for future computing and sensing systems.