浮体门设计的探索与实践

水电站泄水道破坏修复工程,是一项风险高、难度大、前景广阔的系统工程。刘家峡水电站泄水道2号孔破坏修复的关键,是采用人工深水软导向浮体闸门封堵孔口,形成门后洞内旱地施工条件;龚嘴水电站10号冲砂底孔破坏修复的关键,增设浮体闸门采用自动潜行式浮体闸门封堵孔口,形成门后洞内旱地施工条件;哈萨克斯坦CHARDARA水电站SYNAS项目泄水底孔修复的关键,采用分次降水安装浮体闸门侧支承的方法,挡住引水发电机组的下游尾水,在泄水道进口检修门和流道出口之间形成门旱地施工。此3项泄水道修复工程在行业内没有先例,难度很大。整体方案具有创新性,并且均已高质量竣工并投入正常运行。     

鞍钢300 MW CCPP机组配套煤气系统存在问题及解决办法

针对鞍钢燃气蒸汽联合循环发电机组（CCPP）在调试投产过程中出现的问题及对整个煤气系统的影响，采取一系列应对措施解决了问题。     

加快改革解决电煤供需问题

分析了电力行业煤炭采购垄断的弊端。提出要用市场手段和改革的作法解决电煤供需的问题，探索发展多种形式的煤炭资源配置方式，提高能源经济运行的质量。     

合成2,4-二叔丁基苯酚工业试验

以离子交换树脂为催化剂，苯酚和甲基叔丁基醚为原料合成2，4-二叔丁基苯酚(简称2，4酚)，合成产物经过滤再经间歇真空精馏精制提纯，得到高纯度的2，4酚成品。成品精馏后釜中残液在酸性白土催化剂的作用下通过歧化反应生成对叔丁基苯酚，再经精馏提纯得到成品对叔丁基苯酚。通过工艺优化，使2，4酚、对叔丁基苯酚形成联产生产工艺，降低了生产原料消耗和成本。     

初春施工技术要点探讨

论述了初春施工这个特定的施工季节所具有的特征，从气候、施工人员、工程情况及受冻土体等方面对初春施工易出现的问题进行了分析，对施工过程及施工技术规律性问题做了细化性研究和探讨。     

Extensions of LDA by PCA mixture model and class-wise features

Linear discriminant analysis (LDA) is a data discrimination technique that seeks transformation to maximize the ratio of the between-class scatter and the within-class scatter. While it has been successfully applied to several applications, it has two limitations, both concerning the underfitting problem. First, it fails to discriminate data with complex distributions since all data in each class are assumed to be distributed in the Gaussian manner. Second, it can lose class-wise information, since it produces only one transformation over the entire range of classes. We propose three extensions of LDA to overcome the above problems. The first extension overcomes the first problem by modelling the within-class scatter using a PCA mixture model that can represent more complex distribution. The second extension overcomes the second problem by taking different transformation for each class in order to provide class-wise features. The third extension combines these two modifications by representing each class in terms of the PCA mixture model and taking different transformation for each mixture component. It is shown that all our proposed extensions of LDA outperform LDA concerning classification errors for synthetic data classification, hand-written digit recognition, and alphabet recognition.     

时空效应规律在软土深基坑工程中的运用

阐述了时空效应规律在软土深基坑工程中的运用情况，实践证明，运用时空效应规律，能可靠而合理地利用土体自身在基坑开挖过程中控制土体位移的潜力而达到保护环境的目的。     

High Gd Concentration GaGdN Grown at Low Temperatures

GaGdN layers were grown at temperatures below 300°C by radio-frequency plasma-assisted molecular beam epitaxy on sapphire substrates. GaGdN samples with high Gd concentration as high as 12.5% were obtained by lowering the growth temperature. X-ray diffraction results showed no obvious secondary phase, which means that the phase separation can be suppressed by the growth at low temperatures. All samples, including those grown at room temperature, showed ferromagnetic characteristics. Photoluminescence emission was observed, though spectra exhibit broad and sharp luminescence bands related to many kinds of defects. It is suggested that electrons coming from defects, especially, nitrogen vacancy, stabilize ferromagnetism, and that the carrier-induced ferromagnetism occurs in the low-temperature-growth GaGdN.     

巴彦浩特探区钻井液技术初探

巴彦浩特探区钻井液工艺技术的重点是，解决疏松砂砾岩地层水涌漏同层、侏罗系地层水的HCO3^-污染及可能出现的火成岩地层井塌复杂。结合内蒙古巴彦浩特探区地层和井身结构特点，采用了两性聚合物／氯化钾钻井液和氯化钾／石膏-聚磺钻井液体系。该体系抑制能力强，性能稳定．容易实现低固相、低密度近平衡钻井，保护储层效果好。对复杂情况采取了有针对性的处理办法：平稳操作和合理的钻井工程措施是预防水层涌漏同层和火成岩井塌复杂的重要手段；用井场易得的固井水泥或石膏配合烧碱处理HCO3^-污染简便易行；处理火成岩井塌复杂，控制合适的钻井液性能是必要的。     

多部件设备维修问题研究及遗传算法求解

合理组织设备维修，缩短设备维修时间是生产运营管理的一个重要环节。本文探讨了多部件设备维修的有效组织问题。考虑到维修工人对拆分后设备的不同部分具有不同的维修效率，提出了一种基于维修时间优化的决策方法，将其与经典指派方法进行了比较；进一步地，对这一NP-hard问题设计了遗传算法，通过数值例子讨论了其求解有效性。