Influence of medium components on elastase production using crude sources by<Emphasis Type="Italic">Bacillus</Emphasis> sp. EL31410

A newly isolated strain EL31410, producing elastase (E. C3. 4. 4. 7) with high elastolytic activity was identified asBacillus sp. In the medium optimization, it was found that wheat bran and soybean flour hydrosate were the best crude carbon and nitrogen source for enzyme production, respectively. Addition of corn steep flour can affect the bacterium growth and elastase production. A fractional factorial design was applied to study the main factors that affect the enzyme production, and central composite experimental design and response surface methodology were adopted to derive a statistical model for the effect of wheat bran and soybean flour hydrosate on elastase production. The experimental results showed that wheat bran had positive effect but soybean flour hydrosate had negative effect, on enzyme production. An initial concentration of 3.4% (w/v) wheat bran and 9.4% (v/v) soybean flour hydrosate were found to be optimal for enzyme production in batch culture. The time course of elastase production in the optimized medium composition was also described. Project (No. 300024) supported by the Zhejiang Provincial Natural Science Foundation of China     

硒-高分子复合微球的微凝胶模板法制备研究

采用反相悬浮聚合法合成了聚丙烯酰胺(PAM)高分子微凝胶,以其为模板,在室温条件下,以硒代硫酸钠(Na2SeSO3)作为硒源,制备得到了Se-PAM无机-有机复合微球材料,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等手段对复合微球的形貌、无机物硒晶形结构等进行了表征。     

大气汽溶胶复合微粒子群的光学截面及红外发射率光谱的计算

在章[1]的基础上，根据M.L.AdenH和M.Merker的复合微粒子光散射理计算了汽溶胶大气中复合微粒子模型的光学特性，得到了汽溶胶的散射截面、吸收截面和消光截面以及红外发射率光谱，为研究大气红外传输提供了计算方法。     

基于h指数、h_m指数及复合影响因子的图书情报专业期刊评价分析

从国内对期刊评价的现状入手,探讨了h指数、hm指数及复合影响因子的定义。以中国知网(CNKI)引文数据库为数据源,选择北京大学《中国核心期刊要目总览》(2008版)中部分图书情报专业期刊为分析对象,分别计算各个期刊的h指数、hm指数及复合影响因子并进行排序,对结果进行比较分析,从而得出图书情报专业期刊的现状。     

修正混合的Halpern三步迭代序列强收敛性

在一致光滑的Banach空间中,引进了一种新的关于非扩张算子T的修正混合Halpern三步迭代序列,并证明了在一定条件下该迭代序列强收敛于T的不动点.所得结果改进和推广了近年来其他一些相关的近似结果.     

高中生创新能力培养的探索——从上海“创新实验班”看资优学生的创新教育

本文从上海中学、华师大二附中、复旦大学附中、交大附中四所学校率先开展的上海高中创新素养教育实验项目出发,在分析优秀高中学生特质的基础上,阐述了高中生创新能力培养对象的选拔方式,高中生创新能力培养的教育模式、立足点及其范围,同时提供了高中生创新能力培养的支持系统,以为资优学生的创新教育提供一定的参照。     

论彝族族源主源

彝族是复合型民族,彝族的族源是多元的。在地缘政治上,彝族的形成和古蜀国、楚国、滇国、夜郎、南诏均有关系;在具体族源上,彝族的形成比较明显地与羌、濮、昆、叟、劳浸、靡莫有关。     

Effects of schoolwide cluster grouping and within-class ability grouping on elementary school students’ academic achievement growth

We evaluated the effects of one year of schoolwide cluster grouping on the academic achievement growth of gifted and non-identified elementary students using a piecewise multilevel growth model. Scores from 186 non-identified and 68 gifted students’ Measures of Academic Progress Reading and Math scores were examined over three school years. In 2008–2009 within-class ability grouping was used. In 2009–2010 schoolwide cluster grouping was implemented. In 2010–2011 students once again were grouped only within classrooms by ability and students identified as gifted were spread across all classrooms at each grade level. Results suggest that schoolwide cluster grouping influenced student performance in the year following its implementation, but only for mathematics and not the area of reading.     

基于应变的复合材料Non-Fickian吸湿方程

为了研究复合材料吸湿过程中的Non-Fickian行为,建立基于应变的湿扩散方程,可以更准确地描述复合材料吸湿量随时间的变化关系。基于应变的湿扩散方程中考虑湿浓度与湿热应变间的相互耦合作用,假设应变也具有"扩散"行为,引入应变扩散系数与应变耦合项,并根据经典层压板理论计算层压板吸湿过程中产生的瞬时内应力状态。分析结果表明,基于应变的湿扩散方程所得到的吸湿量随时间变化的曲线与试验结果符合较好,层压板的湿浓度与湿热应变的相互耦合作用会影响吸湿量及湿热内应力的计算,在分析中不可忽略。受热和吸湿过程中产生的瞬态应力非均匀分布于层压板内,在复合材料结构设计时必须予以考虑。     

高频脉冲电源参数对 Fe-ZrO2复合电沉积镀层纳米含量的影响

为改善低温镀铁工艺镀层的耐磨损耐腐蚀性能,提高镀层表面硬度,以GKDM系列高频脉冲电镀电源为实验复合电沉积工艺电源并配合超声．机械搅拌制备纳米Fe-ZrO2镀层。研究了高频脉冲电源参数：峰值电流导通（TON）、关闭（TOFF）时间;一组正脉冲（TF）负脉冲（TR）的工作时间对镀层表面纳米含量的影响。结果表明当GKDM系列高频脉冲电源TON=20×0．1ms,TOFF=80×0．1ms时,纳米沉积分布均匀致密,质量分数高。