Degradation of p-nitrotoluene by 03/H2 02 process and oxidation mechanism

The degradation of p-nitrotoluene by O2/H2O2 process in a bubble contact column was investigated.Effects of the molar ratio of hydrogen peroxide to ozone, pH value and t-butanol on the oxidation process were discussed. It was found that the proper H2 O2/O3 molar ratio for the degradation of p-nitrotoluene was around O. 6, different pH values and the presence of t-butanol highly influenced the removal efficiency of p-nitrotoluene. 5-metbyl-2-nitrophenol, 2-methy1-5-nitrophenol, (4-nitrophenyl) methanol, 5-(hydroxymethyl) -2-nitro phenol, acetic acid, 2-methylpropanc diacid and 2-(hydroxylmethyl) propane diacid were identified as degradation intermediates and products through GC-MS. Radical reaction mechanism and degradation pathway were proposed based on the results of experiments. It is deduced that the benzene ring of p-nitrotoluene can be only destroyed by hydroxyl radicals through a polyhydrexy intermediate pathway. Then unstable polybydroxy intermediates can be oxidized to different acids with low molecular weight rapidly.     

Degradation of p-nitrotoluene by O3/H2O2 process and oxidation mechanism

The degradation of p-nitrotoluene by O3/H2O2 process in a bubble contact column was investigated. Effects of the molar ratio of hydrogen peroxide to ozone,pH value and t-butanol on the oxidation process were discussed. It was found that the proper H2O2/O3 molar ratio for the degradation of p-nitrotoluene was around 0.6, different pH values and the presence of t-butanol highly influenced the removal efficiency of p-nitrotoluene. 5-methyl-2-nitrophenol, 2-methyl-5-nitrophenol, (4-nitrophenyl) methanol, 5-(hydroxymethyl)-2-nitro phenol, acetic acid, 2-methylpropane diacid and 2-(hydroxylmethyl)propane diacid were identified as degradation intermediates and products through GC-MS. Radical reaction mechanism and degradation pathway were proposed based on the results of experiments. It is deduced that the benzene ring of p-nitrotoluene can be only destroyed by hydroxyl radicals through a polyhydroxy intermediate pathway. Then unstable polyhydroxy intermediates can be oxidized to different acids with low molecular weight rapidly.     

CO2在多孔介质中扩散系数的测定

为了研究注CO2开采原油时CO2在地层中的扩散系数,采用一维扩散的数学模型,利用一维菲克第二定律和连续性方程推导出了CO2扩散系数的计算公式,设计了多孔介质采用露头砂填充,实验模型装置水平放置而消除了＂对流扩散＂的影响,室内测定CO2扩散系数的双测压点的1 m长的物理模拟装置,得出了在60℃时不同压力下的扩散系数,实验条件更符合矿场实际,研究规律可用于矿场CO2驱过程中的参数优选。     

基于精度控制的凸轮反求实践

精度控制是反求实践研究的一项重要内容.论文分析了精度控制的必要性,给出了精度误差的评价标准,通过对打纬共轭凸轮反求实践中各环节的精度控制,有效的控制了反求误差,实现了凸轮的高精度反求,提高了凸轮反求的品质.     

黑龙江省面污染源调查与污染物估算

根据黑龙江省水资源综合规划成果,提出面污染源负荷量的计算方法,并估算全省地表水面污染物产生量和入河量。     

一个新的环型三核铜配合物的晶体结构研究

用2-羟基-1,3-丙二胺（L）与高氯酸铜反应得到了一个三核铜金属杂环配合物[Cu3（L^-）3]（ClO4^-）3,用X-射线晶体结构分析方法表征了其结构．该晶体属三斜晶系,P-1空间群,晶胞参数a=1．0491（2）nm,b=1．0808（2）nm,c=1．2467（2）nm,a=74．451（3）°,β=70．635（3）°,γ=63．661（3）°,V=1．1829（3）nm^3,Z=4,R=0．0587,wR=0．1363．在配合物的阳离子中,三个铜离子均与相邻配体上的两个氮原子和两个桥联氧原子配位形成四配位平面四方形构型,且通过与三个配体2-羟基-1,3-丙二胺上的桥联氧原子连接形成一个由Cu^2＋和氧原子交错联接的六元杂环结构．     

基于Sugeno模糊积分的多分类器融合方法在多属性决策中的应用

首先介绍了基于Sugeno模糊积分的多分类器融合方法的一般原理,而后将其应用于研究多属性决策中的综合排序问题,最后,用一个实际的案例验证了该融合方法的有效性和可行性。利用该方法不但实现了多属性决策中社会选择函数的功能,而且通过对“分类器”的训练,能够反映出各种决策方法在解决同类问题中的效果。同时,融合后的结果也能够充分地体现出决策者的偏好。     

基于优化RBF神经网络的集成算法及其在调制识别中的应用

首先通过模拟退火算法对单个网络的隐含层高斯基函数中心值和标准化常数聚类算法进行了优化,进而提出了一种基于泛化误差性能跟踪的最优训练中止算法,避免了神经网络的过学习问题;最后通过基于最优权重的集成算法给出了模式所属类别的确定性衡量,提高了识别精度和系统的泛化能力。将该算法用于调制信号类型识别,取得了较高的识别精度。     

乙酰丙酮铁的合成与表征

用乙酰丙酮和氧化铁直接反应合成了配合物乙酰丙酮铁,取得的CCDC（Cambridge Crystallographic Data Centre）编号是693046。通过红外光谱、紫外可见光谱对其进行了表征,并用X射线单晶衍射测定了其晶体结构。结果表明,该晶体属于正交晶系,空间群为Pbca,晶体相关参数分别为：a=1.549 4（5）nm,b=1.359 5（5）nm,c=1.658 9（5）nm,α=β=γ=90,°V=3.494（2）nm3。配合物中心Fe3＋均与三个乙酰丙酮负离子发生双齿配位,形成轻微畸变的八面体构型。     

基于智能手机的语音导航教学辅助系统设计

利用Microsoft Speech SDK语音开发包和提供的TTS组件技术,在VS.NET2008开发环境下,采用C#语言开发适用于智能手机的语音导航教学辅助系统的设计方案。首先介绍了系统开发平台的选型根据,其次对系统体系结构和系统功能进行详细论述,最后给出了系统关键技术及实现方法。该系统的开发方法在适合视障人士的应用领域中具有一定指导意义和实际的应用价值。