Graphene can be transformed into a "speaker" to help deaf people "talk." The “Intelligent Graphene Artificial Throat†invented by Prof. Tian Ling’s group of researchers at the Institute of Microelectronics of Tsinghua University is expected to solve the “speaking†problem of deaf and mute people in the future. Recently, Ren Tianling's research group published a research paper titled "Intelligent Graphene Artificial larynx with sound perception capabilities" in "Nature Communications", which uses the advantages of porous graphene materials to create an integrated body for receiving and transmitting wear. Acoustic devices. According to reports, this integrated acoustic device uses the thermoacoustic effect of graphene to emit sound, and uses the piezoresistive effect of graphene to receive sound, achieving the single-device sound transceiving unit. The porous graphene material used in the device has a high thermal conductivity and a low thermal capacity, and can emit a wide spectrum of sound with a frequency of 100 Hz to 40 kHz through a thermoacoustic effect. Its porous structure is also extremely sensitive to pressure, it can sense the weak vibrations at the throat when sounding, and can receive sound signals through the piezoresistive effect. Therefore, the device can accurately sense the special sounds of deaf and mute people and scream, and convert this “non-meaning sound†into a sound with controllable frequency and intensity, and it is expected to be converted into a pre-recorded language in the future. The reporter saw that when an “artificial larynx†wearer uttered a snoring loudly, the artificial larynx would sense the vibration of the throat and issue a preset sound. When the wearer changes the length of the low, tone, the sound from the artificial larynx also As a result, significant changes will follow. Tao Qiqi, a doctoral student in the Department of Microelectronics and Nanoelectronics at Tsinghua University who participated in the innovation, told reporters that before "decoding", the deaf and mute person need to arrange and combine low-pitched and screaming sounds of different intensities and frequencies in accordance with their own vocal characteristics. Form a "language code" for deaf and mute people. "Each deaf person after the 'encoding' is pronounced, just like the letter keys on the keyboard, and only needs to use different permutations and combinations to express the continuous and complete semantics of deaf and dumb people. This makes us ordinary people not understand The deaf and dumb voices are transformed into normal language and can be expressed continuously,†said Tao Qiqi. Apart from being able to distinguish different tones, smart graphene artificial throats can also "decode" different types of deaf and mute voices based on sound intensity, screaming, coughing, and other sound vibrations. At the same time, they can achieve arranging and arranging syllables and tones. Deaf and mute people speak more abundant sentences.
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Deep groove ball bearing is the most representative structure in rolling bearing, which is widely used. In addition to radial load, this kind of bearing can also be loaded with bidirectional axial load. The friction torque is small, and it is most suitable for adjusting rotation, low noise and low vibration. Bearings are widely used in automobile, electrical, instrumentation, construction machinery, agricultural machinery and various professional machinery. This kind of bearing has open and closed deformation structure.