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Cheewita Suwanchawalit Sumpun Wongnawa Pimpaporn Sriprang Pachara Meanha 《Ceramics International》2012,38(6):5201-5207
A highly visible-light photocatalytic active Ag-modified TiO2 (Ag–TiO2) was prepared by a simple sol–gel process using TiOSO4 as the starting material, AgNO3 as a silver doping source, and hydrazine as a reducing agent. The prepared Ag–TiO2 samples were characterized by several techniques such as X-ray powder diffraction (XRD), BET surface area measurement, scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES), energy dispersive X-ray spectrometry (EDX), X-ray absorption spectroscopy (XAS) and UV–vis diffuse reflectance spectroscopy (DRS). The Ag–TiO2 photocatalyst, a mixture of amorphous and anatase phases, has a high surface area. The silver contents in the Ag–TiO2 samples were determined by ICP measurements. The diffused reflectance UV–vis spectra indicated that the Ag–TiO2 samples exhibited higher red shifts compared with the undoped TiO2 sample. Indigo carmine degradation under visible irradiation indicated that the Ag–TiO2 catalyst gave higher photocatalytic efficiency than those of commercial P25-TiO2 and undoped-TiO2 samples. The Ag–TiO2 catalyst can be reused many times without any additional treatment. 相似文献
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This paper reported the results of simultaneous analysis of main catechins (i.e., EGC, EC, EGCG and ECG) contents in green tea by the Fourier transform near infrared reflectance (FT-NIR) spectroscopy and the multivariate calibration. Partial least squares (PLS) algorithm was conducted on the calibration of regression model. The number of PLS factors and the spectral preprocessing methods were optimised simultaneously by cross-validation in the model calibration. The performance of the final model was evaluated according to root mean square error of cross-validation (RMSECV), root mean square error of prediction (RMSEP) and correlation coefficient (R). The correlations coefficients (R) in the prediction set were achieved as follows: R = 0.9852 for EGC model, R = 0.9596 for EC model, R = 0.9760 for EGCG model and R = 0.9763 for ECG model. This work demonstrated that NIR spectroscopy with PLS algorithm could be used to analyse main catechins contents in green tea. 相似文献
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Dulyawat Wongnawa 《家电科技》2010,(3)
<正>设计者设想,如今出现在科幻小说中的技术,会在90年后成为现实。到那时人们可以利用电讯冰箱来传送食物,从而节约去菜市场和超市采购新鲜食物的时间和路程。电讯冰箱采用触摸屏技术实现食物传送功能,非常简便地把食物调配入冷藏室和冷冻室。该设计获得2009年伊 相似文献
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An investigation of wind characteristics and wind energy potential at Chiang Mai Province, Thailand was studied. Wind data
taken from the weather station at Chiang Mai International Airport between 2001–2006 was analyzed in order to obtain the potential
energy generated by a Vertical Axis Wind Turbine (VAWT). It was found that the yearly average wind velocity was 5.7 meters
per second with a standard deviation value of 2.2 meters per second. The analysis assumed that wind blew in the S.W. to N.E.
direction. Two parameters for the local wind, the shape parameter (k) and scale parameter (c) were obtained at 2.928 and 6.381
meters per second, respectively. The estimated power that could be generated by a Vertical Axis Wind Turbine was 183.09 W/m2 at 30 meters above ground level. This particular site corresponds to class 1 wind power. This level of power density may
be adequate for non-connected electrical and mechanical applications, such as battery charging and water pumping. 相似文献
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This research reported on the successfully production of biodiesel by transesterification of crude rice bran oil (RBO). The process included three-steps. Firstly, the acid value of RBO was reduced to below 1 mg KOH/g by two-steps pretreatment process in the presence of sulfuric acid catalyst. Secondly, the product prepared from the first process was carried out esterification with an alkaline catalyst. The influence of four variables on conversion efficiency to methyl ester, i.e., methanol/RBO molar ratio, catalyst amount, reaction temperature and reaction time, was studied at this stage. The content of methyl ester was analyzed by chromatographic analysis. Through orthogonal analysis of parameters in a four-factor and three-level test, the optimum reaction conditions for the transesterification were obtained: methanol/RBO molar ratio 6:1, usage amount of KOH 0.9% w/w, reaction temperature 60 °C and reaction time 60 min. In the third step, methyl ester prepared from the second processing step was refined to become biodiesel. Fuel properties of RBO biodiesel were studied and compared according to ASTM D6751-02 and DIN V51606 standards for biodiesel. Most fuel properties complied with the limits prescribed in the aforementioned standards. The consequent engine test showed a similar power output compared with regular diesel but consumption rate was slightly higher. Emission tests showed a marked decrease in CO, HC and PM, however, with a slight increase in NOX. 相似文献
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连续茶叶筛选和揉捻装置的评估(英文) 总被引:1,自引:0,他引:1
研究茶叶连续筛选、揉捻装置的设计、制造,并对其性能进行测试。在200℃条件下,分别将茶叶筛选装置和揉捻装置的转速设定在7~14r/min和34~68r/min范围内进行试验。结果显示最佳的试验条件是筛选装置转速10.8r/min,揉捻装置转速51r/min.当筛选量45kg/h和揉捻量18kg/g时,揉捻茶叶的产率最高,可以达到81%。 相似文献
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