Alkaline cooking is common method for fiber degumming. Microwave was used to improve the degumming process of sisal fiber in this study, and the influence of degumming time, degumming temperature, and the solution composition on degumming result under microwave heating was probed. The experiment results show that microwave heating has significant effect for sisal fiber degumming. The optimal parameters for sisal fiber degumming, such as microwave heating at 100 °C for 30min in 3% NaOH solution, were also obtained.
For the channel source of large capacity image data, the error correcting capability and coding efficiency of channel encoding is very important, in order to solve the real-time and parallel of encoding, a kind of code encoding method realized easily by FPGA is proposed. First, the coding principle of the convolutional code is introduced in detail; Secondly, the representation method of the convolutional encoder is elaborated, including the state transition diagram and the grid diagram of the convolutional code; Then, the convolutional encoding algorithm based on FPGA will be converting to achieve rapid, parallel processing method; Finally, (2,1,7) convolutional code algorithm is simulated and tested. The experimental results show that: the convolutional encoding module is capable of handling the input data stream of up to 160Mbps, processing speed, to meet the parallel and real-time of convolutional encoding for the channel source of large capacity image data, to improve the efficiency of convolutional encoding.
Eu3+-doped La2Mo2O9 phosphor was fabricated by sold-state reaction method. The as-prepared samples were characterized by the application of X-ray diffraction (XRD), scanning electron microscopy (SEM), and emission spectra. The effect of the sintering temperature and doping amount of europium ion on the luminescent properties of La2Mo2O9:Eu3+ was investigated. The results show that the luminescent intensity will reach the strongest when the sintering temperature is equal to 1073 K. The Eu3+ doping amounts also have obvious effect on the luminescent properties.
Bismuth titanate powders have been prepared by the citric-combustion method using bismuth nitrate and tetrabutyl titanate as the starting materials, and the effect of sintering temperature and the ratio of bismuth to titanium on their structure and photocatalytic activity was studied. The powders were characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The photocatalytic properties of the samples were probed by using the methyl blue as simulated contaminants. The results showed that bismuth titanate powder prepared at 873K has the best photocatalytic activity.
InxBi1-xVO4 photocatalyst particles were prepared by low temperature solid reaction using nitrate of indium and bismuth and NH4VO4 as the starting materials, and followed by the sintering at various temperatures. The as-prepared samples were investigated by X-ray powder diffraction (XRD), and the photocatalytic activity was carried out by the concentration change of methylene blue in the solution after visible light irradiation. The experiment results show that the orthorhombic phase InVO4 is dominant in the photocatalyst samples prepared at sintering temperature higher than 600°C. In addition, the increase in indium content in the InxBi1-xVO4 particle has greatly improved the photocatalytic activity for decomposition of aqueous methylene blue under visible light irradiation.
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