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This paper is based on the general condition that renewable energy resources used in buildings in Guangxi subtropical regions. By integrating the case of 9# dormitory building in Bowen College, Guilin University of Technology, making compare and contrast to the effectiveness of using ground source heat pump system, air source heat pump system , solar electric water heaters under such condition, taking the effectiveness of using renewable energy resources in air source heat pump system, the author discuss the issue of renewable energy resources system and the integration of buildings and provides some suggestions.

We design and realize a testing and analyzing tool for performance of image compression algorithms. This tool can test and analyze compression algorithms and generate kinds of analysis chart automatically, provides a lot of convenience for users and has very important practical value.

The insecticidal and repellent activities of essential oil from leaves ofEucalyptus grandisagainstCulex pipiens quinquefasciatuswere investigated. The essential oil was obtained by hydro-distillation and analyzed by gas chromatography-mass spectrometry (GC-MS). The principal constituents in the essential oil werep-cymene (26.794%),α-pinene (15.864%), eucalyptol (6.281%),α-terpineol (4.100%), limonene (3.614%) and borneol (2.519%). The results indicated that the essential oil ofEucalyptus grandisleaves hold insecticidal and repellent activities againstCulex pipiens quinquefasciatus. The complete protection time for people againstCulex pipiens quinquefasciatuswas correlative with its concentration. It could protect people for 7h when its concentration was 50%. Fumigating insecticidal activity was evaluated by airtight fumigation in conical flask. The LC50values of the essential oil for adults ofCulex pipiens quinquefasciatuswere 4.5%(0.5h), 3.6%(1h), 2.6%(2h), 2.1%(4h), 0.56%(8h) and 0.56%(24h). The LT50value of the essential oil was 19.1 min when its concentration was 6.4%.