高水头混流式水轮机导水机构预装中的若干问题

如何控制水轮机导水机构端面狭小间隙是高水头混流式水轮机导水机构预装中的普遍问题。本文详细介绍了配车顶盖使间隙在合适范围内的工艺方法以及涉及的一些其他问题。     

淀粉与乙烯型单体接枝共聚物的应用研究新进展

廉价易得的淀粉与乙烯型单体接枝共聚物兼具合成和天然高分子的优良性能 ,如塑化成膜性、超强吸水性、絮凝性、粘合性等 ,特别是其可生物降解性和原料的再生性 ,利于减小环境负荷及对非再生资源的依赖性。接枝共聚物的研究引起了人们的极大关注 ,开发应用日益广泛和深入。因此 ,探讨近年来其在各领域的应用研究新进展有重要意义     

我国渣油加工技术的新进展及对其发展的思考

分析了近年来我国渣油加工技术的新进展,并就发展我国渣油加工技术提出了几点建议。     

模糊综合评价法在企业危机预警中的应用

首先分析了企业危机预警的重要性,然后阐述了企业危机预警的原理和预警工作程序;在模糊评价方法的基础上,提出了基于专家群评价的模糊综合评价方法,通过校正-补偿评价法把专家对企业的评价和对专家评价水平的评价综合起来;最后通过实例说明了这种方法在企业经营危机预警中的具体应用,并对结果进行了分析和讨论.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.     

New cryoultramicrotome with a feedback-advance system

Cryoultramicrotomy is gaining in significance and use as technical improvements are made. In comparison with epoxy resin procedures, cryopreparations are more rapid; there is only a negligible loss of material and thus antigenicity is well preserved. The present work contains some newly developed details for the exact determination of the advancement of the sample in the direction of the knife in a microtome. It is a software-controlled ultramicrotome advance drive system with feedback regulation as well as repeatedly patented devices for advancement sensors.     

Fenton法在制革废水深度处理中的应用及实例

文章以广东省某皮革工业园集中污水处理厂为例进行废水处理工艺升级改造方案研究。在对该皮革工业园原有生产废水处理工艺调查和存在问题总结的前提下，经采用Fenton氧化法进行升级改造后，废水污染物去除效率明显提升，出水水质良好，能稳定达到《广东省污染物排放限值》（DB44／26—2001）一级排放标准的要求。     

PBT工程塑料概况及展望

综述了近年来国内外ＰＢＴ工程塑料的市场及技术进展。针对国内ＰＢＴ供应商与国外ＰＢＴ供应商的差距，提出了加强 新品种开发，提高现有品种质量水平，积极开发国内外市场和加快原料１，４－丁二醇的国产化等建议。     

发电机运行中突然进相的原因分析及对策

通过对发电机运行中突然进相的现象、原因进行分析,阐述了进相对机组的影响,并提出了应对、处理措施,取得了较好的效果。     

武钢第二炼钢厂近几年钢水成分控制的进展

介绍了武钢第二炼钢厂近几年钢水中碳和酸溶铝的含量及盛钢桶至中间包增氮的变化，以及控制这些万分所采取的措施。