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This paper introduces concept and merits and demerits of wireless local area network (WLAN), analyzes the IEEE 802.11 series standards of WLAN. Based on simulation platform OPNET, the network model, node model and process model of distributional WLAN are constructed. The network performances of WLAN under 802.11 series standards are studied. The results indicate that setting different network parameters...
The leakage of air-conditioning refrigerating system will reduce the operation efficiency and bring about serious atmosphere environment pollution. This article puts forward that the leak detection of air-conditioning refrigerating pipeline system by means of stress wave detecting, we set up the NDT system and use the LabVIEW graphical programming software which was popular currently to determine...
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