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As drop-induced failures are most dominant in handheld electronic products, enhancing the anti-dropping performance of fine-pitch ball grid array (FBGA) package, which are currently popular in handheld electronic products is very important. In this paper, the anti-dropping performance of Fine-Pitch BGA package is evaluated with respect to their solder joint reliabilities after drop impacts test experiment...
A switchable passively mode-locked fiber laser is experimentally demonstrated by using single-wall carbon nanotubes as saturable absorber. The mode-locked fiber laser can be operated at the central wavelengths of 1947nm, 1945nm and 1943nm, individually.
A liquid level optical fiber sensor based on all-fiber single-mode-multimode-no-core-single-mode (SMNS) structure is proposed, which possesses a water level sensitivity of 215.98 pm/mm by monitoring the wavelength shift, and −0.109 dB/mm of the power attenuation.
Aiming at the influence of lens distortion to imaging measurement system, this paper puts forward an improved method for lens distortion correction based on linear approximation. Firstly, the method solves the radial distortion coefficient linearly based on the principle of cross-ratio invariance under perspective projection. Then a higher precision of the straight line is obtained according to the...
Image restoration technique is very important in the field of industrial vision system, especially in the application of detection and positioning, but now researches for industrial damaged mark image restoration technology is few, which restricts the efficiency and development of detection and location in industrial production. Aiming at some disadvantages existing in the Criminisi algorithm, we...
An anaerobic membrane bioreactor (AnMBR) was employed for the treatment of low-strength municipal wastewater in this study. The membrane filtration performance and pollutant removal efficiency were investigated. A series of measurements, i.e., three dimensional excitation-emission matrix (EEM) analysis, gel filtration chromatography (GFC), Fourier transform infrared (FTIR) analysis, characterization...
This paper presented a grid-connected inverter incorporating multiple technical concepts like “single-stage”, “multilevel” and “transformerless”, and thus attracting in cost and efficiency. Also energy storage (ES) was integrated to assist extensive power regulation. A complete control scheme was developed to achieve wide range real/reactive power management involving pure real power, pure reactive...
This paper presents a single-stage grid-connected inverter with energy storage system (ESS) for small distributed power generation (DG) system application. A reactive power allocation (RPA) strategy is developed so the proposed inverter can provide real and reactive power in wide range. In particular, the ESS can provide not only harmonic compensation but also reactive power to enhance the system...
This paper presented a power conditioning system integrating microturbine (MTG) and solid oxide fuel cells (SOFC) for auxiliary power units (APU) applications. Cascaded multilevel inverters are applied to achieve the power conversion between MTG and SOFC. Two different switching schemes, i.e. independent switching scheme and unified switching scheme, are proposed to eliminate low-order harmonics of...
In this paper, a novel asymmetric 5-level inverter is studied which is composed of a half-bridge diode-clamp inverter and a conventional half-bridge inverter connected to a common split-capacitor power supply. Analysis of a modulation technique for the inverter, which incorporates square-wave synthesis in conjunction with the PWM subharmonic method, is illustrated. According to the proposed control...
This paper presents a novel hybrid diode-clamp cascade 13-level inverter. The inverter is based on the series connection between two inverter modules with higher and lower DC bus voltage. According to a hybrid control scheme in the topology, it is the fact that higher voltage devices and faster devices operate in synergism. Subharmonic PWM method is employed in lower voltage module. In the case of...
This paper proposed a novel hybrid asymmetric 9-level inverter in which an asymmetric 5-level inverter and an H-bridge inverter with equal DC bus voltage are series connected. A hybrid asymmetric modulation technique for the novel inverter is illustrated. In terms of the control technique adopted, the new configuration permits faster devices and higher voltage devices operating in synergism. In the...
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