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61.
研究了放电声发射波检测中用小波变换进行数据预处理的实现问题。内容包括小波分析预处理的步骤 ,选择小波 ,选择小波分解层数 ,提取有用频段的小波系数 ,小波消噪过程 ,小波消噪中的阈值选取 ,对提取的小波系数进行小波消噪等。两组实测信号的小波分析数据预处理结果证明了数据预处理的有效性 相似文献
62.
考察研究了9种预处理体系对8种常见金属氰络合物的离解效率,结果表明:有6种预处理体系均能得到较满意的结果。此外,还探讨了预处理体系中金属氰络合物的离解机理,提出了各种存在形式氰化物离解的可能机理。 相似文献
63.
反渗透海水淡化技术应用 总被引:8,自引:0,他引:8
简要回顾了反渗透技术的发展过程及应用状况.针对国内典型反渗透海水淡化工程实例,分析了一期、二期不同工艺、设备的技术特点,并针对相关海域的海水水质介绍了海水预处理技术以及存在的问题. 相似文献
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66.
论述了预处理难选金矿细菌的种类、来源,浸出机理,浸出工艺及工业应用实践.归纳介绍了强化难选金矿细菌浸出的措施. 相似文献
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The efficient utilization of lignocellulosic biomass and the reduction of production cost are mandatory to attain a cost-effective lignocellulose-to-ethanol process. The selection of suitable pretreatment that allows an effective fractionation of biomass and the use of pretreated material at high-solid loadings on saccharification and fermentation (SSF) processes are considered promising strategies for that purpose. Eucalyptus globulus wood was fractionated by organosolv process at 200 °C for 69 min using 56% of glycerol-water. A 99% of cellulose remained in pretreated biomass and 65% of lignin was solubilized. Precipitated lignin was characterized for chemical composition and thermal behavior, showing similar features to commercial lignin. In order to produce lignocellulosic ethanol at high-gravity, a full factory design was carried to assess the liquid to solid ratio (3–9 g/g) and enzyme to solid ratio (8–16 FPU/g) on SSF of delignified Eucalyptus. High ethanol concentration (94 g/L) corresponding to 77% of conversion at 16FPU/g and LSR = 3 g/g using an industrial and thermotolerant Saccharomyces cerevisiae strain was successfully produced from pretreated biomass. Process integration of a suitable pretreatment, which allows for whole biomass valorization, with intensified saccharification-fermentation stages was shown to be feasible strategy for the co-production of high ethanol titers, oligosaccharides and lignin paving the way for cost-effective Eucalyptus biorefinery. 相似文献
69.
Phosphating is a widely adopted treatment in industry for many purposes. In this paper, carbon steel was pretreated with sodium silicate before phosphating. X‐ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements were used to evaluate the pretreatment effect by sodium silicate on the phosphating layer. The results demonstrate that the phosphate layer pretreated by sodium silicate has a better corrosion resistance as compared with the un‐pretreated ones. More compact and uniform coatings composed of finer crystals were obtained with the pretreatment of sodium silicate. 相似文献
70.
K. Savaş Bahçeci 《International Journal of Food Science & Technology》2012,47(2):315-324
The central composite design with a quadratic model was used to investigate the effect of temperature (20–40 °C) and transmembrane pressure (TMP) (100–300 kPa) as well as pretreatment with gelatin and bentonite (0:0–300:1500 mg L?1) on permeate flux and fouling resistance during ultrafiltration of apple juice. The changes in some physicochemical properties were also investigated. Pretreatment of apple juice with gelatin and bentonite and an increase in the temperature and TMP significantly improved the permeate flux. In general, physicochemical properties of apple juice other than polyphenolics were not affected by the applied parameters. Using 150 mg L?1 of gelatin and 750 mg L?1 of bentonite for fining significantly reduced the total phenolic content and so did the fouling resistance. Fouling resistance also decreased with increasing temperature, and increasing pressure increased the fouling resistance. 相似文献