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In this study, an extremely simple one-step ball milling has been applied to fabricate the flaky Fe3O4/Fe composites. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). It is acknowledged that the ball-milling process has huge influence on the morphology and electromagnetic...
A series of PEO45-b-PtBA53-b-PSx (x = 42, 84, 165) triblock terpolymers were synthesized by the atom transfer radical polymerization and characterized by size exclusion chromatography and 1H NMR. Their self-assemblies were conducted by a two-step hierarchical self-assembly method and a one-step dialysis method and the self-assembly behaviors were investigated. The morphologies, sizes, and size distributions...
In this paper, an FHMA acoustic communication system for multiple underwater robots based on hardware platform is developed. The sound card in the computer with sound box and microphone is used as the energy transduction to accomplish acoustic communication. For the hardware part, DS18B20 is taken for example as the data source to generate the original signals and MAX232 chip is adopted to connect...
In this paper, a CDMA acoustic communication system for multiuser based on hardware platform is developed. The sound card in the computer with sound box and microphone is used as the energy transduction to accomplish acoustic communication. For the hardware part, DS18B20 is taken for example as the data source to generate the original signals and MAX232 chip is adopted to connect the MCU to the RS-232...
In this paper, an acoustic communication system for multiuser based on hardware platform is developed. The sound card in the computer with sound box and microphone is used as the energy transduction to implement acoustic communication. For the hardware part, DS18B20 is taken for example as the data source to generate the original signals and MAX232 chip is adopted to connect the MCU to the RS-232...
This paper proposes an underwater acoustic communication system based on tamed spread spectrum and FHMA (Frequency Hopping Multiple Access) for multiple underwater robots. In this system, multiple underwater robots can communicate with the console on the water surface simultaneously successfully. The communication system is composed of tamed spread spectrum modulation and demodulation, frequency hopping...
This paper designs an underwater acoustic communication system based on QPSK-CDMA (Quaternary Phase Shift Keying-Code Division Multiple Access) for multiple underwater vehicles. Through this system, multiple underwater vehicles can communicate with the console on the water surface simultaneously without interference. The communication system is composed of channel encoding and decoding, spread spectrum...
This paper proposes an underwater acoustic communication system based on DS-CDMA (direct sequence code division multiple access) for multiple underwater vehicles. Multiple underwater vehicles in this system can communicate with the console on the water surface simultaneously without interference. The communication system is composed of channel encoding and decoding, spread spectrum modulation and...
In this paper, a kind of underwater acoustic communication system based on CDMA (code division multiple access) for multiple underwater robots is proposed. This system enables multiple underwater robots to communicate with the console on the surface of water simultaneously successfully. The whole communication process is composed of channel encoding and decoding, spread spectrum modulation and demodulation,...
In this paper, based on the configuration of leaky coaxial cable (LCX) with vertical slots, combined with related electromagnetic radiation theory, the radiated field of LCX in free space is analyzed by the method of Cylinder Fourier Transform. Further more, a rectangular tunnel is taken for example to calculate coupling loss of LCX in the blind zone with the use of ray-tracing method. The material...
As an instrument to realize mobile communication in the blind zone, leaky coaxial cable (LCX) is recently widely used in communication systems of tunnels, mines, subways and so on. In this paper, beginning with the radiation theory of LCX and antenna, by the use of ray-tracing method, we take a tunnel for example to analyze its radiated field produced by both LCX and spiral antenna. By comparison,...
The path of electric waves of leaky coaxial cable (LCX) in the blind zone is analyzed in the ray-tracing method on the assumption that the bind zone is rectangular, and the distribution of the radiated field in the blind zone is calculated. Further, the effect of the period of the slots of LCX on the magnitude fluctuation is also discussed: a proper period can decrease the magnitude fluctuation of...
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