白蚁链霉菌ACT-2菌株抗菌谱及其发酵液抑菌稳定性分析

测定了白蚁链霉菌（Streptomyces termitum）ACT-2菌株的抗菌谱．结果表明：ACT-2菌株对细菌类病原体有较强的拮抗能力,对真菌类病原菌抑菌效果不显著．以水稻白叶枯病菌（Xanthomonas oryzae pv．oryzae）P6生理小种为指示菌,分析了ACT-2菌株发酵液的抑菌稳定性．ACT-2菌株发酵液抑菌稳定性实验显示：在温度低于80℃,4000lx光照强度下,ACT-2菌株发酵液能保持稳定的抑菌能力;温度高于90℃时,其发酵液的抑菌能力开始降低;经酸碱处理后,其发酵液的抑菌能力出现了明显的降低．     

流体分配罩对稳压器封头内流动和传热的影响

通过模化实验的方法,在1/4模型上进行了流动可视化实验,研究了稳压器底部封头内的流动情况,并在1/5模型上进行了局部对流换热系数的测定,实验研究发现,流体在封头内以面推进的方式上升或下降;有、无稳压器分配罩对封头内对流换热系数的影响较大,在无分配罩时,封头内各点的对流换热系数远小于有分配罩和支持板时的情况;封头内的相对对流换热系数符合0.2/sinθ的分布规律,并且基本上与进口管的雷诺数成正比,实验结果为稳压器封头的安全性分析提供了依据。     

红曲多糖的过氧化氢法脱色工艺研究

为了优化红曲多糖的过氧化氢法脱色工艺,在单因素实验的基础上,选择过氧化氢加入量、脱色时间和脱色温度为自变量、多糖脱色率为响应值,应用DesignExpert软件,采用响应曲面法,研究了各自变量及其交互作用对多糖脱色率的影响．利用响应面分析方法拟合得到了二次多项式回归方程的预测模型,并确定了红曲多糖过氧化氢法脱色的最佳条件：4mL多糖（8mg／mL）溶液中3％过氧化氢溶液的加入量为3．9mL,脱色时间为127min,脱色温度为65．6℃．该条件下红曲多糖脱色率为86．24％．     

MAPO-11分子筛的合成及表征

研究了MAPO 11分子筛的合成工艺,考察了镁铝摩尔比、模板剂、晶化温度以及晶化时间等因素对合成工艺的影响,采用X射线衍射、电镜扫描、热重量差热分析等手段对合成的样品进行了表征。结果表明,在一定的镁铝摩尔比范围内,能合成出结晶度和纯度较高的MAPO 11分子筛,这种分子筛的热稳定性较差。     

红腐乳中高产γ-氨基丁酸红曲霉菌株的筛选

从红腐乳中分离筛选到一株相对高产γ-氨基丁酸(GABA)的红曲霉菌株M-6,初步鉴定该菌株为紫红曲霉(Monascus purpureus).对菌株M-6的发酵培养基和发酵条件用单因素轮换试验和正交试验进行了整体优化.结果表明,菌株M-6转化富集GABA的适宜条件为:以可溶性淀粉为碳源、牛肉膏和硝酸钠为复合氮源,在初始pH5.0、培养温度40℃、摇床速度120 r/mim条件下发酵培养48 h,发酵液中GABA的产量最高可达7.826 g/L.表明利用红曲霉菌株进行富含GABA食品的生产是可行的.     

Study on an Organic Hybrid Made from Chlorinated Polyethylene and 2,2''''-methylene-bis- (4-methyl-6-cyclohexylphenol)

The dynamic mechanical properties and miscibility of an organic hybrid made from chlorinated polyethylene (CPE) and 2, 2'-methyIene-bis-( 4-methyl-6-cyclohexylphenol) ( ZKF ) are mainly discussed in this paper. It is found that ZKF acts as an antiplasticizer in CPE matrix and has good miscibility even with large ratio in CPE /ZKF hybrids. The glass transition temperature of various CPE /ZKF hybrids determined by DSC give a good fit to Wood's equation. Bifunctional ZKF is supposed to improve the intermolecular force of CPE, and the improvement is developed when the ZKF content increases. On the other hand, the viscoelastic properties are highly improved with the addition of ZKF. TA and tanδ peak values increase when the ZKF content increase in the CPE /ZKF hybrids, the damping capacity has been improved during the glass transition of CPE /ZKF hybrids. In addition, the glass transition temperature shifts to room temperature from the low temperature with the continuous addition of ZKF to CPE.     

Application of Chitosan Flocculant to Conditioning Sludge

The dewaterability of activated sludge conditioned by chitosan flocculant was studied. The effects of chitosan characteristics such as molecular weight, degree of deacetylation, and dose on the dewaterability were investigated. The sludge dewaterability is evaluated in terms of specific resistance to filtration, residual turbidity of supernatant, moisture content of cake, and settling rate. Sludge dehydrating behaviors conditioned with CTS, PAM and PAC flocculants were compared. The conditioning was also carried out with dual flocculants in two stages. It is found that the sludge conditioned with CTS has better dewaterability than that with PAC. The optimum conditions with chitosan are: dose 0.8 - 1.2 g per 100 g dry cake, molecular weight 300,000, and degree of deacetylation 70%. The conditioning in two stages with dual flocculants is found to be more effective than that with single flocculant.     

具间断系数的拟线性抛物型方程的初边值问题

研究了拟线性抛物型方程当系数在一条或几条有一定光滑性的曲线x=X(t)上间断时的初边值问题.此结果扩推广了[1,2]中关于线性方程的结果,而且所得到的解的光滑性比文[3,4]的相应问题的解的光滑性好.