磷铵料浆蒸发浓缩系统扩能改造方案设计计算

针对料浆法磷铵装置浓缩系统扩能改造的一种称为“两效三体流程”的具体实施方案,论述了其优越性,并通过设计校核计算证明其可行性。     

Modeling of Groundwater Contamination by Phenol Released from Spilled Bitumen

Leaching of phenol from spilled bitumen into flowing aquifer poses an environmental threat to groundwater contamination. A two‐dimensional model with de‐coupled transfer was built to model phenol propagation in the flowing stream. The model predicted that the produced phenol concentration monitored at an observation well would rise sharply and then decline gradually as the phenol flux emerging from the bitumen surface was depleted with time. The model is useful in estimating the size of the spill, produced phenol concentration, phenol spatial distribution and the time required for the phenol concentration to decline to an environmentally acceptable level. It is well suited to other water pollution problems with chemical spills.     

3-正丙基-5-羧基-1-甲基吡唑的合成研究

以 2 -戊酮和草酸二乙酯为起始原料 ,经 Claisen缩合、环化、甲基化和皂化等反应制得目标化合物 3-正丙基 - 5 -羧基 - 1 -甲基吡唑 3。文献报道的合成方法为四步法 ,在此基础上加以改进 ,形成了两种新的合成路线 ,即三步法和两步法 ,其收率均高于四步法 ,高出 2 7.0 %     

沉淀硫酸钡的干燥

介绍了回转干燥窑干燥系统和两级空心浆叶干燥系统流程、设备结构特点和工作原理 ,对其优缺点进行详细的分析比较 ,肯定了这两种干燥系统是工业普钡生产的主要干燥方法。     

十六烷基三甲基溴化铵在二氧化硅表面吸附的研究

十六烷基三甲基溴化铵在亲水二氧化硅表面的吸附呈现出两阶段的特点，在第一阶段对应单分子层吸附，而第二阶段对应双分子层吸附，用椭圆偏振法测出的十六烷基三甲基溴化镓在二氧化硅表面吸附层的厚度表明了这特性。     

基于各向异性的二维云模型滤波

针对云模型滤波器在去除椒盐噪声的过程中没有考虑到图像各向异性的缺点, 提出了一种新的图像去噪方法。该方法首先利用云模型滤波器的噪声检测器对噪声图像进行检测, 然后对认定为噪声的图像部分利用基于二维云模型的模糊加权滤波算法, 并结合噪声周围非噪声像素的空间位置信息和像素值信息进行图像复原。将这种新的算法与原始方法进行相同环境下的对比实验。结果表明, 对于椒盐噪声密度为10%～50%的测试图像, 虽然在计算效率方面该算法略逊于原始算法, 然而在处理的过程中, 其展现了图像各向异性, 同时也更好地保持了图像的细节信息; 而且图像细节越复杂, 提升效果越明显。     

基于人脸表情特征的情感交互系统*

设计了一套基于人脸表情特征的情感交互系统(情感虚拟人),关键技术分别为情感识别、情感计算、情感合成与输出三个方面。情感识别部分首先采用特征块的方法对面部静态表情图形进行预处理,然后利用二维主元分析(2DPCA)提取特征,最后利用多级量子神经网络分类器实现七类表情识别分类;在情感计算部分建立了隐马尔可夫情感模型(HMM),并且用改进的遗传算法估计模型中的参数;在情感合成与输出阶段,首先采用NURBS曲面和面片相结合的算法,建立人脸三维网格模型,然后采用关键帧技术,实现了符合人类行为规律的连续表情动画。最后完成了基于人脸表情特征的情感交互系统的设计。     

Two- and three-dimensional chloride ingress into fly ash concrete

2D, 3D chloride ion concentration at the edge and corner zones were systematically investigated for fly ash concretes made with different cement replacement percentage by fly ash (0%, 10%, 20%, 40%, 60%), water to binder ratios (0.3, 0.35, 0.4), and curing ages (28 d, 90 d). An interaction effect caused by 2D and 3D diffusion could obviously be observed through the comparison with 1D testing results. In order to quantify the interaction effect, 2D and 3D diffusion interaction coefficients was proposed in this paper. Finally, the changes of 2D and 3D interaction coefficients with the change in the free chloride ion concentration were given. The above research provide an insight into chloride ion attack on the edge and corner reinforcing bars of concrete structures in the field of civil engineering.     

Simulation of Nylon 6 Polymerization in an Industrial Two‐Step VK Tubular Reactor

A commonly used nylon 6 two‐step VK tubular reactor is simulated in this work. To verify the reliability of the model, careful comparison with results obtained on different continuous plants is made. The effect of various conditions and parameters, e.g. feed composition, temperature, pressure, etc. on the product properties such as caprolactam conversion, degree of polymerization (DP), dimer, integral heat and their distribution index is studied. It is observed that the caprolactam conversion and DP of the product may be affected by various conditions in the first stage and the temperature profile at the top of the second stage, but they finally reach the equilibrium values if the residence time is long enough. The most effective way to increase DP of the product is to increase the vacuum at the top of the second stage.

CPL conversion and DP profile for pressure of tube 2: 0.032, 0.037, 0.042 mPa; other parameters as given for example A of Table 5 .     

双组分阴极电泳漆

用环氧树脂、聚酰胺树脂为主要原料制备阴极树脂并分散成乳液，再与色浆按3：1的比例混合，加入适量的水，配制成固体分19％的槽液，熟化后进行电泳涂装。对槽液性能、涂料耐性和泳极状况进行了分析测试，并介绍了双组分阴极电泳漆的优点。