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The self-balanced two-wheel Cars are often devised in various competitions, and are involved in this direction in many large games. Based on the Freescal Semiconductor XS128 series single-chip microcomputer as the core controller, with the gyroscope and angle sensor to achieve two-wheel Car self-balance, the self-balanced two-wheel structure, the balance principle and the control algorithm are introduced emphatically, and the self-balanced two-wheel car is finally completed through repeated testing.

In this paper, the computational formula of field distribution in a coaxial waveguide and the field distribution, resonant frequency and Q factors of open coaxial resonator are introduced. The S21 and the field profile of the TEM mode in a coaxial waveguide, and the field profile and E-field of the mode in a coaxial resonator is gained by the software CST microware studio. The truth that an open coaxial cavity is virtually a slow-varied section coaxial waveguide is gained.

In this paper, introduces a multiplex smart responder based on the virtual instrument technology. The programming language Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) is used and the NI Educational Laboratory Virtual Instrumentation Suite II (NI ELVIS II) platform is chosen as target device in designing this responder. The control kernel of this responder is LabVIEW program, it can realize lots of functions, such as adjusting question time and answer time, etc. The experiment proves, this responder is advantageous to have short design period, high reliability, easy operation and maintenance, and be helpful for user in the field of virtual instrument technology.

Based on the coupled mode theory and the FORTRAN software, study are carried out for the frequency response in a coaxial Bragg reflector with gradual change ripples. Results show that the characteristics of frequency response in the positive gradual change or the negative gradual change ripples coaxial Bragg reflector are the agreement, and the bandwidth of the coaxial Bragg reflector with gradual change ripples can be expanded as the gradual angle augmenting when the incident mode is Single-mode and lower frequency; When the incident mode is Coupled-mode and higher frequency, the bandwidth of the operating mode and the spurious mode also all can be expanded as the gradual angle augmenting, but the negative gradual change ripples can get higher frequency than the positive gradual change when the gradual angles are same; and the residual side-lobes of the frequency response also can be effectively suppressed. These characteristics of a gradual change ripples coaxial Bragg reflector are favorable to improvement of the performance as a reflector or a filter in its applications.