认真创建服务型企业拓展老水电厂发展空间——湖北省白莲河水力发电厂发展问题的思考

根据对白莲河电厂历史的与现状的分析,提出该厂应当由生产型向服务型转变,在服务中提高职工素质,拓展老水电厂的发展空间.     

大掺量粉煤灰在电厂大体积混凝土中的应用

该文主要针对电厂烟囱基础大体积砼的技术要求,采用60 d砼强度值作为设计值,采用大掺量粉煤灰、改进施工工艺等技术措施,以满足大体积砼施工中温度控制的要求。     

Al的添加对Gd-Co合金的影响

用X射线衍射、扫描电镜和磁性测量等方法研究了Al的添加对Gd-Co合金的影响。研究结果表明：在一定范围内掺杂Al导致GdCo2、GdCo5和Gd2Co17晶格常数增大，但仍保持各自的晶体结构；Al的添加使GdCo2和Gd2Co17的居里温度降低，但是对于GdCo2却是先增后减。该结论为寻找新的磁性材料提供了有价值的参考。     

基于雅可比矩阵的电压控制区域划分的改进

对应用比较广泛的电压控制区域（VCA）划分方法进行了改进，在传统的去除小元素法基础上，采用牛顿 — 拉夫逊法潮流雅可比矩阵中有功和无功对电压幅值偏导数的子矩阵之和进行VCA划分;然后，将各种拓扑变化对系统电压稳定性的影响进行排序，按从大到小的顺序用这些拓扑变化对得到的VCA分区进行修正，直到修正结果不再改变为止，从而得到了适用于各种拓扑结构下电压稳定性分析的分区。改进后分区的有效性在新英格兰10机39节点系统上得到了验证。     

Degradation of polyethylene terephthalate films in the presence of lubricants for HFC 134a: a critical issue for hermetic motor insulation systems

Earlier studies conducted in the use of sealed tubes with polyalkylene glycol lubricants and polyethylene terephthalete (PET) films revealed that the PET films exhibited embrittlement and (visual) degradation. This led to an investigation of PET embrittlement mechanisms with the new lubricants used with HFC 134a. The lubricants studied were three polypropylene glycols (the monol, the diol and the completely end-capped glycols), pentaerythritol ester and a blend of monol and ester. The effects of moisture content, temperature and lubricant structure were studied. All lubricants in this study were of viscosity grade ISO-32 (150 SUS). The results were compared to PET film embrittlement in the presence of CFC 12 and mineral oil. This study reconfirmed the earlier findings that the PET films must be dried to lower than 0.1 wt.% moisture content for use in hermetic systems. This paper discusses the effect of the moisture content of the lubricant and the effect of the lubricant structure on PET films. The dependence of the various mechanisms on temperature is shown. Esters and end-capped polyalkylene glycols are recommended for use with HFC 134a.     

菰和菖蒲对生活污水净化效果的研究

用泡沫塑料板作为漂浮载体,在盛有生活污水的玻璃缸中单独和等量混合种植菰与菖蒲(每缸6株),研究其对生活污水的净化效果。结果表明,菰和菖蒲在供试生活污水中均能正常生长,二者无论是单独种植还是等量混合种植净化效果均明显好于对照。菰单独种植、菖蒲单独种植和二者混合种植对污水中TN的去除率分别为92.8%、92.7%、94.9%,对NH3-N的去除率分别为95.5%、97.4%和96.6%,对TP的去除率分别为83.9%、94.3%和84.7%,对CODCr的去除率分别为83.0%、85.5%和86.7%。菖蒲单独种植对TP的去除效果明显好于菰单独种植和二者混合种植。混合种植没有表现出比单独种植更好的净化效果。     

挠性抗回旋PDC钻头的有限元分析

回旋是导致PDC钻头早期失效的主要原因，介绍了一种基于挠性钻头的构想设计的抗回旋PDC钻头，阐述了其结构和抗回旋原理。对挠性钻头的公、母接头进行了有限元应力分析，说明了模型建立、网格划分以及约束和载荷施加过程中所采用的方法和关键技术。有限元分析结果表明挠性钻头的强度满足要求。