羧甲基纤维素取代基沿分子链分布的均一性（Ⅰ）──溶剂种类对均一性的影响

利用电位滴定法测定不同溶剂中生成的羧甲基纤维素（ＣＭＣ）完全酶降解和酸水解后的还原端基数，计算出反映ＣＭＣ一条分子链上取代基均一性的参数，如取代及未取代葡萄糖单元（ＡＧＵ）的长度、单取代及双取代百分数等；研究这些ＣＭＣ的酸解程度随时间的变化，考察溶剂种类对ＣＭＣ取代基分布的影响．结果表明：用二甲亚砜作溶剂，反应效果最好；二氧六环、丙酮、异丙醇及叔丁醇的效果也佳，生成的ＣＭＣ取代基分布较均匀，耐酸性较强；甲醇和乙醇中生成的ＣＭＣ取代基分布均一性很差．     

易效明目功防治学生近视统计分析及其机理探讨

本文对易效明目功防治青少年近视眼的效用进行了显著性统计分析,P<0.05,效果显著。同时对功法明日效果显著的原因、机理进行了深入的分析。     

碘酸氧化再生高碘酸的电极行为研究

本文报导以高碘酸为媒质间接电合成双醛淀粉过程生成的碘酸电极氧化再生高碘酸的电流效率与电极材料、电解条件等的关系，从而为其媒质再生的研究提供依据．     

Fibonacci泛准晶的声子局部性质

本文发展了一种新的实空间重正化群方法,精确地求解泛Fibonacci准晶关于对角、非对角、混合紧束缚模型的声子局部格林函数和局部态密度.结果表明.在ω→O的低频区,其声子局部态密度与准晶结构的非周期性无关;而在ω>1的中高频区,其声子局部态密度与泛Fibonacci准晶的结构特征密切相关。     

陡坡紊流边界层的分析与计算

本文依据紊流边界层的动量方程和连续方程,利用流速分布的对数律,推导了陡坡紊流边界层的发展厚度δ和水深h的计算式,并与原型观测资料进行了对比。结果证明,本文所推公式和原型观测资料完全一致,同时,本文还推导了陡坡摩阻流速的计算式,所得成果对计算陡坡的切应力提供了依据。     

钢铁厂煤气资源的最优分配

建立了钢铁厂煤气资源旬计划最优分配模型,利用替代松弛法可以在微机上迅速求解这个0—1整数规划模型。仿真说明,用本模型可以显著改进煤气资源的分配,减少煤气放散,提高经济效益。     

岩石爆破性稳健模糊分级新方法的探讨

作者在对国内外岩石爆破性分级分析研究的基础上,首次将稳健统计学应用于岩石爆破性分级理论中,并将稳健统计学与模糊理论有机地结合起来,提出了一种科学、可靠的分级方法——稳健模糊分级法。     

导向剂室温老化合成低硅X型沸石

利用导向剂室温(15～30℃)老化后高温晶化合成低硅X型沸石(LSX),用XRD测定样品晶型.对导向剂作用的研究表明,加入老化5h的导向剂17Na2O.6SiO2.Al2O3.250H2O可抑制LSX样品中的羟基方钠石(HS)杂晶,但没有加快LSX反应体系的晶化速度.对原料配比和反应条件的研究表明,产物对H2O/(Na2O K2O)摩尔比和Na2O/(Na2O K2O)摩尔比非常敏感,稍有变化就会引起杂晶的生成;随着室温老化和晶化温度的升高以及时间的延长,样品LSX结晶度增大.室温(25～30℃)老化12h、110℃晶化3h合成的LSX结晶度好、纯度高,Si/Al摩尔比为1.02±0.03.     

The role of sediment resuspension duration in release of PAHs

Polycyclic aromatic hydrocarbons （PAHs） are ubiquitous environmental pollutants. Due to their low water solubility and high hydrophobicity, PAHs are rapidly sorbed onto particles and subsequently deposit in sediments once introduced into aquatic environment. In such a way, sediments become a huge sink for PAHs. During sediment resuspension, the potential exists for PAHs to be released from sediments into water. Sediment resuspension plays an important role in the transportation and fate of PAHs in the aquatic environment. In this study, release behavior of PAHs on Yangtze River sediment during resuspension was investigated using a particle entrainment simulator （PES）. The role of resuspension duration on release of 16 PAHs was measured by resuspending sediment for 12 h at 0.2 and 0.5N/m^2, respectively. Results indicated that PAH concentrations in TSS increase over time with more increase of phenanthrene and 4-ring PAHs. Comparing with 0.2 N/m2 （30%）, TPAHs concentrations in TSS demonstrated remarkable increase during 0.5 N/m2 resuspension （37%）. Dissolved PAH concentrations increased throughout the duration with more increase of 2-3 ring PAHs （50%-88%）. Dissolved PAH concentrations showed remarkable increase during 0.5 N/m^2 resuspension （50%）. Moreover, PAH concentrations in overlying water throughout the duration of resuspension were higher than toxic effects threshold values in drinking water developed by WHO, which may cause toxic effect on ecosystem.