Analysis on acoustic characteristics of opposed multi-burner gasifier

Hilbert–Huang Transformation and Statistical Theory are used to analyze the impinging flame noise signals of a gasifier. The characteristic of the flame noise energy is studied by standard deviation and probability density, and frequency–time distribution is generated by the empirical mode decomposition (EMD) method and Hilbert spectrum. The results show that, in different conditions, the value of standard deviation of four burners impinging flame noise is greater than that of the two burners, but not for the probability density. The change of the standard deviation and probability density of four burners is smaller than that of two burners. It means that the flame of four burners combusts severely but stably. Under the condition of low feed and oxygen ratio, the two flame burner noise signals frequency and energy distribute mainly in 100 Hz regions; and four burners flame noise distribution is concentrated in the low-frequency bands below 45 Hz and the 45–100 Hz bands.     

梯度磁场中薄膜厚度梯度的形成机理

借助于基片下方放置的磁铁，在溅射的放电空间中引入了纵向的梯度磁场，辉光放电时，其外貌发生了显著的收缩，由此沉积的薄膜在平面内存在明显的厚度梯度，用磁场中带电粒子的运动理论解释了此种薄膜的形成机制。     

The asymmetrical fractional Fourier transforms and its optical implement

Compared with the symmetrical lens system, the structure which contains double cylindrical lenses is also the basic units of a complex system and implement practical asymmetrical fractional Fourier transforms. Based on the theory of scalar diffraction and on the Fourier optics, we implement several kinds of asymmetrical fractional Fourier transforms and make the different mathematical manipulation at the corresponding coordinates, while the symmetrical system cannot. Meanwhile, the simulation experiment shows that such system not only makes the two perpendicular coordinates to be independently operated, but also increases the flexibility of the optical setup. All these characteristics make it flexible to application domain in optics.     

新型聚乙烯醇系亲和吸附剂的制备及其在糖蛋白纯化中的应 …

利用已合成的聚醋酸乙烯酯－甲基丙烯酸缩水甘油酯－甲基丙烯酸烯丙酯大孔共聚物。醇解后与６－氨基正已酸反应，进一步在ＥＤＡＣ的作用下实现与间氨基苯硼酸的偶联，得到亲水性的亲和吸附剂；配基密度为０．８６５ｍｍｏｌ／ｇ干树脂，偶联效率为８９％，以云芝糖肽八方地，吸附容量为５３．７ｍｇ／ｇ干树脂，为醇解前的７．７倍。     

数域Q(P_1~(1/2),…,P_t~(1/2))(t≥4)的类数为偶数

设t≥4，ｐ１，…，ｐｔ为不同的模４余１的素数，本文证明了数域P1~(1/2)，…，Pt~(1/2)的类数为偶数．     

跨层级性别多样性变量在工作满意度和离职意图之间的调节作用

本研究在国外研究的基础上,将不同职务层级的性别多样性变量引入离职意图的前因变量模型中,并检验了多样性变量对于工作满意度和离职意图之间的调节效应。在对298个样本做回归分析后,发现了高层管理者和中层管理者性别多样性变量对离职意图的显著影响作用,以及基层管理者和上级性别多样性变量对于工作满意度和离职意图的调节作用。     

Revêtements modérés et groupe fondamenttal de graphe de groupes

Let R be a discrete complete valuation ring, with algebraically closedresidue field. Let X be a semi-stable R-curve, with smooth generic fibre. In this paper we study tame coverings of X.     

非平稳随机过程模拟的一个谱表示方法

本文由Priestley渐进谱理论导出了非平稳随机过程蒙特卡罗模拟的一个谱表示方法.按照该方法,样本过程可直接由一余弦级数公式计算产生.可以证明,当级数项数足够大时,模拟的样本过程可准确地反映非平稳随机过程规定的性质;当产生的样本过程足够多时,其总体均值和总体自相关函数均趋于相应目标函数;样本过程随着级数项数趋于无穷而渐近呈正态分布.本文方法最显著的特点在于可以借助随机相位角产生具有某些预期特征的样本过程.     

α-四(对磺酸钠苯氧基)酞菁锌(钴,镍)光敏剂的光动力性质研究

采用UV-Vis光谱、红外吸收光谱、CHN元素分析及激光解析飞行时间质谱对α-四(对磺酸钠苯氧基)酞菁锌(钴,镍)[α-PhSPcZn(Co,Ni)]进行表征.在光诱导条件下,采用四甲基偶氮唑蓝比色法(MTT法),考察了光敏剂的中心原子、浓度和光照时间等条件下对癌细胞的抑制作用.结果显示,光照15min、浓度为0~100mg·L-1范围内时,α-PhSPcZn的抑瘤率高于α-PhSPcCo和α-PhSPcNi.抑瘤率均随光照时间和配合物浓度的增加而升高,α-PhSPcZn的抑制率可达54%,其IC50值为75mg·L-1.     

1,3-双[3-(1-甲氧基-2-羟基丙氧基)丙基]封端聚硅氧烷的合成

以1,3-双[3-(1-甲氧基-2-羟基丙氧基)丙基]四甲基二硅氧烷和八甲基环四硅氧烷(D4)为原料,通过阳离子催化开环聚合制备了1,3-双(3-(1-甲氧基-2-羟基丙氧基)丙基)封端聚硅氧烷,研究了反应温度,反应时间,催化剂种类及加入量对于聚合反应的影响,结果表明,最佳反应条件为:反应温度65℃,反应时间24h,浓硫酸作为催化剂加入量为反应物质量的0.3%,此时反应拥有最高的转化率。通过红外光谱与核磁共振光谱对产物进行了表征。