n , has been prepared and characterized by IR, elemental analysis, thermal analysis and singlecrystal X-ray diffraction. The crystal structure reveals that the compound has an achiral two-dimensional layered structure based on opposite-handed helical chains. In addition, it exhibits significant photocatalytic degradation activity for the degradation of methylene blue.

A novel two-dimensional CdII coordination framework, poly[[[μ-1,3-bis(2-methyl-1H-imidazol-1-yl)benzene-κ2 N:N′](μ-1,3-phenylenediacetato-κ4 O,O′:O′′,O′′′)cadmium(II)] dihydrate], {[Cd(C10H8O4)(C14H14N4)]·2H2O} n or {[Cd(PDA)(1,3-BMIB)]·2H2O} n [1,3-BMIB is 1,3-bis(2-methyl-1H-imidazol-1-yl)benzene and H2PDA is 1,3-phenylenediacetic acid], has been prepared and characterized using IR, elemental analysis, thermal analysis and single-crystal X-ray diffraction, the latter revealing that the compound is a (4,4) grid coordination polymer with layers oriented parallel to the bc crystal planes. In the crystal, adjacent layers are further connected by O—H...O and C—H...O hydrogen bonds, forming a three-dimensional structure in the solid state. In addition, the compound exhibits strong fluorescence emissions and shows photocatalytic activity for the degradation of methylene blue in the solid state at room temperature.

This paper illustrates detection principle and detection method of thermal performance parameter of solar collector tubes, design a device to detect thermal performance parameter of solar collector tubes. This device adopts S3C2440 microprocessor which is developed with ARM920T core and embedded Linux system as hardware platform and develops the application program. This device could achieve real-time multitasking function detection of the thermal performance parameter of solar collector tubes, at the same time the device will transfer the data to computer via LAN communication. Due to the application of ARM and embedded Linux system make the intellectualized degree and operating speed of the device improved greatly, while it can realize real-time multitasking function.

The aromatization of n-hexane was studied over Zn-WC/HZSM-5 catalyst prepared by impregnation and reduction-carbonization method. The effect of zinc content on aromatization selectivity of Zn-WC/HZSM-5 was investigated. The results show that the 1% Zn-WC/HZSM-5 was the most active catalyst attaining an aromatic selectivity of 35% at 550°C, which was much higher than that of WC/HZSM-5. It was found experimentally that a proper amount of Zn and WC resulted not only in the higher selectivity of aromatization of n-hexane but also in decreasing of coke deposition.

Coal and gas outburst is one of the most important natural disasters in our country. Thus pre-warning has the great significance to production safety for coal mine. In view of the facts of current pre-warning technologies, such as single pre-warning indicators, poor performance under interference and low real-time capability, some new pre-warning models are presented. The models include G line, moving average line and so on. Based on data mining theory, the pre-warning system works on the time series of gas emission concentration (which is called G series), and the pre-warning system for outburst is designed as well. 4.19 coal and gas outburst in Dashu Village Coal Mine of Hebei Fengfeng Coal Mining Group is studied based on pre-warning system. And the result is in accord with accident investigation. The analysis shows that the pre-warning system can mine the outburst developing process information of coal-rock dynamical system from the time series of gas concentration and realize outburst accidents pre-warning.