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This paper presents an in-depth study of temperature response and moisture transport tests in damaged concrete under an atmospheric environment. Effects of concrete damage on thermal conductivity and temperature response were also investigated along with the effects of concrete damage on moisture transport caused by temperature gradient. The experimental results show that thermal conductivity of concrete...
A novel kind of MEMS micro-gyroscope, piezoelectric micromachined modal gyroscope (PMMG), is introduced in the paper. PMMG works with the special vibratory mode of solid material, and it is a kind of solid-state micro-gyroscope, which is different from micromachined vibratory gyroscope. There is no moving part and suspended structure in PMMG, and it is robust for the higher resistance to shock and...
A new modeling approach for the metal halide (abbrev. MH) lamp has been put forward in this paper. Our works focus on the followings: (1) Based on the low frequency behaviors of MH lamp, a new model for the MH lamp has been proposed. This model is simple but very useful; (2) The voltage waveform of the lamp is not sinusoid but looks like a square waveform, a method for estimating the voltage value...
In this paper, an approach by using the Agilent 4395A to measure the loop gain of the power supply has been deeply developed. The main issues have been investigated as the following: (1). Measurement techniques about the parasitic parameters of the filtering components will be studied. One is how to test of the electrolyte capacitor by Agilent 4395A; another is how to test dynamic inductance of filter...
A single stage AC/DC converter with resonant model PFC has been deeply studied in this paper by mathematic analysis. The following results have been revealed: (1).The working conditions for the circuit have been derived and can be expressed by the formulas, which can be used to select the parameters of the circuit; (2). It has been proved that the bus voltage decreases if output power increases and...
A single stage AC/DC converter with resonant model PFC has been deeply studied in this paper by mathematic analysis. The following results have been revealed: (1).The working conditions for the circuit have been derived and can be expressed by the formulas, which can be used to select the parameters of the circuit; (2). It has been proved that the bus voltage decreases if output power increases and...
In this paper, an approach by using the Agilent 4395A to measure the loop gain of the power supply has been deeply developed. The main issues have been investigated as the following: (1). Measurement techniques about the parasitic parameters of the filtering components will be studied. One is how to test of the electrolyte capacitor by Agilent 4395A; another is how to test dynamic inductance of filter...
A new modeling approach for the metal halide (abbrev. MH) lamp has been put forward in this paper. Our works focus on the followings: (1) Based on the low frequency behaviors of MH lamp, a new model for the MH lamp has been proposed. This model is simple but very useful; (2) The voltage waveform of the lamp is not sinusoid but looks like a square waveform, a method for estimating the voltage value...
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