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Introduction to Electromechanical Filters
Published in John T. Taylor, Qiuting Huang, CRC Handbook of ELECTRICAL FILTERS, 2020
It is important for the filter user when studying various filter types to differentiate electromechanical filters from electromagnetic-field filters (for example, microwave filters). In the latter case the waves within the resonator are electromagnetic rather than acoustic. For example, the term ceramic filter is sometimes used to describe a filter composed of resonators that are one quarter wavelength (electromagnetic) lines using ceramic material. These resonators are roughly 0.75 cm long at 1.0 GHz. The frequency of a corresponding half-wavelength (acoustic) ceramic resonator of the same length is 200 kHz.
Realization of RFID-Based DAS Using an RF Transceiver and Huffman Coding
Published in IETE Journal of Research, 2020
Soumen Ghosh, Palash Kumar Kundu
In the tag part, an Arduino Uno board is used. This board is made based on microcontroller ATmega328. There are 14 digital input or output pins, 6 analog inputs, a USB connection, a power jack, a 16 MHz ceramic resonator, an ICSP header, and a reset button. For data acquisition purposes, a temperature sensor LM35 is used which is an integrated circuit temperature device with an output voltage linearly proportional to the centigrade temperature [17]. The LM35 temperature sensor is calibrated in Kelvin as the user is not required to subtract a large constant voltage from the output to obtain a convenient Centigrade scaling [17]. The output of the temperature sensor analog voltage is given in the analog port of the microcontroller board. This microcontroller converts the analog signal to a digital signal and as per programming it transmits serially with the help of the RF modem after encoding as FM0 after decoding the PIE signal from the reader.
Optimizing latency time of the AR system through glyph detection
Published in International Journal of Computers and Applications, 2019
Suman Bhakar, Devershi Pallavi Bhatt
The model diagram uses the Arduino UNO controller and one arm of the machine (camera), servo motor, virtual serial port, and infra-red light as shown in Figure 1. The Arduino UNO is a microcontroller board based on the ATmega16U2. It has 14 digital input/output pins out of which 6 can be used as PWM (Pulse Width Modulation) outputs, 16 MHz ceramic resonator, 6 analog inputs, USB connection, power jack, an ICSP header, and reset button. USB 2.0 is connected to the USB aurduino socket for RS 232 communication. The arm of the machine is attached to the servo motor. Figure 2 shows that the servo motor is connected with the Arduino UNO controller which controls the motion of the arm of the machine. The UNO controller has12 digital pins. The servo motor has three wires (red, black, and yellow), the red wire is connected to the 5 V supply pin, the black wire is connected to the ground pin, and the yellow wire is connected to pin number 9, which sends the controlling signal to the arm of the machine. The virtual connection port establishes the connection between one application to another application.
Thermoelastic damping in functionally graded material circular micro plates
Published in Journal of Thermal Stresses, 2018
Shirong Li, Shun Chen, Peng Xiong
In Figure 3, the characteristic curves of TED versus the material gradient index, p, for some given values of the thickness in a clamped circular FGM micro plate are depicted. As it shows that there exists a minimum value of TED in the FGM micro circular plate with small values of the thickness (). Consequently, by adjusting, or optimizing the volume fractions of the constituents of the FGM micro plate one can design a higher quality FGM plate resonator with the lowest TED which is even smaller than that of the corresponding pure ceramic resonator. From the numerical results, the energy dissipation behaviors in the transversely non-homogenous resonators is more complicate than that in the homogenous resonators due to the combined action of thermoelastic coupling vibration and the through thickness heat conduction.