In this work, the application of time delay estimation in ultrasonic wind speed measurement system is discussed. The algorithm of time delay estimation based on least mean square (LMS) adaptive noise cancellation of generalized correlation with fixed ultrasonic is presented. The algorithm uses LMS daptive filter to eliminate the noise interference efficiently and does not need to know prior-knowledge of signal and noise. Then, it uses generalized correlation to estimate the time delay. Computer simulation and practical test results show that the algorithm can effectively eliminate noise. The wind speed estimation accuracy is very high; so the algorithm can be used for monitoring the low-level wind field at airport regional.

As the unbleached pulp is acidified with sulfuric acid or chelated with ethylenediamine tetraacetate(EDTA),the contents of metal ion Mg2+,Mn2+,Fe3+,Zn2+ and Cu2+ are reduced in different degrees by atomic absorption spectrometry analyzing,and the removal rate of Cu2+ and Mg2+ with acid pretreatment is the highest,but the removal rate of Fe3+ and Zn2+ with EDTA pretreatment is the highest.In addition,when the addition amount of sulfuric acid or chelating agent are 1.5% and 0.6% respectively,the removal rate of metal ions are higher.After acid or chelating pretreatment,the brightnesses of pulps are increased respectively 3.8%ISO~5%ISO and 4.30%ISO~5.2%ISO,and the reduction rates of permanganate number are 6.5%~9.6% and 5.3%~10% respectively.And when the addition amount of acid and chelating agent are 1.0% and 0.6% respectively,the brightness of pulp is improved significantly,the permanganate number is declined maximally,but the viscosity is fallen slightly.The pulps with and without pretreatment are bleached by photocatalysis,the results show that after acid pretreatment the brightness of pulp is reduced 2.3%ISO~3.5%ISO,the reduction rate of permanganate number and viscosity is similar.And after chelating pretreatment the brightness of pulp is increased 3%ISO,the reduction rate of permanganate number is increased 6%,but the viscosity is kept well.

After H2SO4 pretreatment, in unbleached pulps the content of metal ions Mg2+, Mn2+, Fe3+, Zn2+ and Cu2+ are reduced in varying degrees by atomic absorption spectroscopy analysis, among the ions, the maximum removal rates are Cu2+ and Mg2+. And when the added amount of H2SO4 is 1.5%, the removal result of metal ions is the best. After acid pretreatment, the pulp's brightness has been increased about 3.8%ISO-5%ISO, the pulp's hardness has been reduced by 0.7%-1.0%, the pulp's viscosity has been kept well. Besides, when the added dosage of H2SO4 is 1.0%, the increasing of whiteness and the decreasing of hardness are the greatest. Through the contrast research of photocatalysis bleaching to the two pulps of before and after acid pretreatment, the results has been found that the brightness of bleached pulp been decreased about 2.3%ISO-3.5%ISO, and the decreasing rates of hardness and viscosity respectively are almost the same after H2SO4 pretreatment.

After ethylene diamin tetra-acetic acid (EDTA) chelating pretreatment, in unbleached pulps the content of metal ions Mg2+、Mn2+、Fe3+、Zn2+ and Cu2+ are reduced in varying degrees by atomic absorption spectroscopy analysis, among the ions, the maximum removal rates are Cu2+ and Mg2+. And when the added amount of EDTA is 0.6%, the removal result of metal ions is the best. After chelating pretreatment, the pulp’s brightness has been increased about 4.3%ISO~5.2%ISO, the pulp’s hardness has been reduced by 0.7%~1.0%, and the pulp’s viscosity has been kept well. Besides, when the added dosage of EDTA is 0.6%, the increasing of whiteness and the decreasing of hardness are the greatest. Through the contrast research of photocatalysis bleaching to the two pulps of before and after pretreatment, the results has been found that the brightness of photocatalysis bleached pulp been increased about 3.0%ISO, and the decreasing rates of hardness reach to the maximum, and the viscosity remains well.

The effects of enzyme dosage, substrate concentration, pH value, reaction temperature and reaction time on enzyme hydrolysis saccharification reaction of the stems and leaves of banana were studied. The result shows that the optimized conditions are: dosage of enzyme 0.06g/g oven dry material, substrate concentration 30g/L, pH value 5.0, reaction temperature 50°Cand reaction time 48h.Analyse the structure changes of the stems and leaves of banana before and after enzyme hydrolysis through X-ray. The result shows that the crystallinity of the stems and leaves of banana increases 10.64% after enzyme hydrolysis.