Design and construction of a capacitor sensor with a precise readout system are described in this paper. A variable air-gap capacitive transducer was constructed and for signalmeasurement a successful attempt was made to exploit the capacitance changes in terms of the phase angle of the detected signal. The reported setup makes it possible to detect capacitance changes of the order of 2.5 fF in...

â â â â â  â â â  abstract â  beijing’s industrial structure is service-oriented with a high degree of economic openness, and gdp has maintained rapid growth. this paper analyzes the international financial crisis and the impact of china’s anti-crisis policies on beijing’s economic development as well as its transmission mechanism. impact index (excluding seasonal factors) and arma model ...