一种多时间尺度电力系统奇异摄动模型的推导

由于电力系统是一个多时间尺度的高阶非线性系统,其稳定性分析就变得异常复杂。为了提高稳定计算的效率．研究电力系统的多时间尺度动态模型及其降阶是非常必要的,为此,以电力系统物理电路为基础．导出了一个计算快动态和慢动态的电力系统奇异摄动模型。利用系统化的降阶方法,对电力系统模型进行降阶,并通过忽略快动态和固定慢动态,得出一个简化的、符合传统电力系统储备结构的电力系统模型,这对理解系统失稳机制具有重要意义。     

DMD红外场景产生器非均匀性校正方法研究

非均匀性是影响数字微镜器件(Digital Micro-mirror Device,DMD)红外场景产生器投射红外场景质量的主要因素之一,DMD红外场景产生器必须经过非均匀性校正才能满足复杂环境下红外成像设备内场仿真试验的应用要求.给出了DMD红外场景产生器的非均匀性校正流程;提出了一种更适合于现有测试条件的变尺度稀疏...     

EBPVD制备ODS Ni基高温合金抗氧化性能研究

采用电子束物理气相沉积技术制备了微晶氧化物弥散增强Ni基高温合金,并研究了该合金的高温氧化行为.通过最小二乘拟合得到的合金氧化动力学模型近似遵循4次方规律,并在高温氧化过程中,合金能够生成单一的Al2O3氧化膜,而且氧化膜的粘附性好,不易脱落.稀土氧化物的添加可明显地改善合金的抗高温氧化性能,提高氧化膜的粘附性.     

Wear Resistance of CO2 Corrosion Product Scale Formed at High Temperature

 To investigate the correlation between structure characteristics and wear resistance of CO2 corrosion product scales at high temperature and high pressure, an autoclave was used to prepare CO2 corrosion product scales on N80 steel in carbon dioxide corrosion environment. The correlation between wear resistance of the scales and many other factors, such as temperature, pressure, morphology, structure, velocity of fluid medium, sand grain size, and so on, was comparatively analyzed by a self assembled wear device, and the scale morphologies before or after being worn were observed by scanning electron microscope (SEM). And then the surface grain size and thickness of scale were measured. The results showed that the cross section of the corrosion scale was of a double layer structure, the outer layer of which was composed of regular crystals, whereas the inner layer was a thin scale of fine grains. The outer grain size and thickness of scale varied with temperature, and the initial wear loss was consistent with the surface grain size; at the same time, the total wear loss corresponded to the thickness of scale. Compared to wear resistance in different depths of the scale, it was found that the structure of scale was a double layer structure in cross section, and the wear resistance of inner layer was better than that of the outer layer; the closer the scale to the matrix, the greater was the wear resistance of scale; and the larger the size or the higher the rotary speed of solid grain in multiphase flowing medium, the more was the wear loss of scale.     

新型无磷绿色高效缓蚀阻垢剂的研制及性能评价

目前国内工业循环冷却水大多采用磷系配方,给后续废水处理增加了费用,并容易造成二次污染。随着环保要求的不断提高,磷系配方的应用越来越受到限制。通过大量试验开发出无磷绿色缓蚀阻垢剂ECH-337和无磷缓蚀增效剂ECH-337A。试验结果表明,ECH-337与ECH-337A同时使用,与磷系配方相比,不但具有良好的缓蚀阻垢性能,而且经济成本相当,并具有显著的环境效益。     

膦基丙烯酸三元共聚物的合成及阻垢性能评定

以丙烯酸（AA）、马来酸酐（MA）为原料,次亚磷酸钠-过硫酸盐为引发剂,合成新型膦基丙烯酸三元共聚物。通过正交实验和单因素实验对聚合反应的影响因素进行了优化,确定了最佳合成条件。静态阻垢实验结果表明,对碳酸钙的阻垢性能优于氨基三甲叉膦酸（ATMP）和二乙烯三胺五亚甲基膦酸（DETPMPA）。     

地热水结垢趋势的判断

根据我国地热利用的实际经验，指出传统使用的雷兹诺指数在判断地热水的结垢趋势时，有一定局限性。在一定条件下，采用腊森指数，才能得出正确结构，这一结论已被广泛用于地热井的水型判断。     

改革管理机制实现规模经济──化工企业实现两个根本转变的关键

通过对不同类型企业的具体分析指出，实行现代企业制度改造及实现装置生产的规模经济，是当前化工行业实现两个根本转变的关键