基于波动和相关性复线性回归的系统谐波阻抗计算方法

系统背景谐波波动致系统谐波阻抗难以准确计算,本文基于主导波动、线性度、谐波阻抗不突变特性提出3种数据筛选准则消除背景谐波影响.本文将公共点(point of common coupling,PCC)处电流数据进行分段,由每段数据中电流的方差判断数据波动程度,依据波动程度的不同将数据分成3类.其中的第1类数据判断其电压电...     

临南地区扭张构造形成机制及其控藏作用

针对以往对临南地区扭张构造的发育演化机制、扭张构造对油气成藏要素的控制作用认识不清等问题,综合运用地质、地球物理、数值模拟等方法,定性分析和定量评价相结合,对研究区扭张构造形成机制及其控藏作用进行研究.结果 表明,临南地区始于伸展性动力学背景下的斜向拉伸运动,由于复活的基底断层走向斜交于区域拉伸方向,从而形成了典型的扭...     

基于混合智能的锅炉飞灰含碳量实时目标值模型

为了降低飞灰含碳量,提高锅炉运行水平,运用混合智能技术建立了飞灰含碳量目标值模型.从运行优化角度提出了飞灰含碳量目标值的定义和技术可行方案.通过对锅炉的历史运行工况数据库进行数据挖掘,建立了锅炉历史最优工况数据库,以此作为训练样本建立飞灰含碳量目标值的神经网络模型,在进行了实例验证后对模型进行了分析讨论.实际应用表明该模型具备自调节能力,能够向运行人员实时提供当前工况下的飞灰含碳量目标值,为飞灰含碳量的实时优化指明了调整的方向.     

三峡左右岸电站机组稳定性能和能量特性的试验与研究

稳定性能和能量特性一直是检验和评价水轮发电机组好坏的关键性指标,也是水电站安全和经济运行的基础.对三峡左右岸电站水电机组进行了大量的真机试验,对5种机型的压力脉动、振动和摆度、稳定运行区、出力和效率曲线进行了对比分析,掌握了三峡左右岸电站5种机型的稳定性能和能量特性,为指导三峡电站机组的安全稳定和经济运行奠定了基础.     

“最近发展区”理论在水库移民长期补偿安置方式中的应用初探

在水库长期补偿安置方式的研究中缺乏社会科学的研究理论和研究角度，该文尝试通过维果茨基( Lev． S． Vygotsky)的“最近发展区”理论来分析和思考长期补偿安置方式各个维度的不足，从而提出可发展维度的目标实现途径，为长期补偿安置方式的发展提供更为客观的建议。     

Tuning the Model Predictive Control of a Crude Distillation Unit

Tuning the parameters of the Model Predictive Control (MPC) of an industrial Crude Distillation Unit (CDU) is considered here. A realistic scenario is depicted where the inputs of the CDU system have optimizing targets, which are provided by the Real Time Optimization layer of the control structure. It is considered the nominal case, in which both the CDU model and the MPC model are the same. The process outputs are controlled inside zones instead of at fixed set points. Then, the tuning procedure has to define the weights that penalize the output error with respect to the control zone, the weights that penalize the deviation of the inputs from their targets, as well as the weights that penalize the input moves. A tuning approach based on multi-objective optimization is proposed and applied to the MPC of the CDU system. The performance of the controller tuned with the proposed approach is compared through simulation with the results of an existing approach also based on multi-objective optimization. The simulation results are similar, but the proposed approach has a computational load significantly lower than the existing method. The tuning effort is also much lower than in the conventional practical approaches that are usually based on ad-hoc procedures.     

地质综合探测技术在顾桥矿的应用

顾桥矿南翼“地质异常带”为较复杂的大型地堑构造带，断层大部分为张性正断层，上通松散层，下到1煤层底板灰岩强含水层，岩体松散破碎，胶结程度差，裂隙发育，稳定性低，部分崩解程度高。为保证巷道安全掘进，通过井下超前综合物探探测并结合钻探的方法，查清了区内水文地质、瓦斯地质、工程地质情况，做到了安全和生产两不误。     

Study of hydroxycinnamic acids and malvidin 3-monoglucoside derivatives using capillary zone electrophoresis and ultra-performance liquid chromatography

Model solutions (pH = 3.5, 12% ethanol) of malvidin 3-O-glucoside (Mv3glc), the most common free anthocyanin in grapes and red wines from Vitis vinifera, and three free hydroxycinnamic acids present in wines (caffeic, ferulic and p-coumaric acids) were studied.     

Evaluation of the potential of geopolymer mortar in the rehabilitation of buried infrastructure

Concrete pipes represent the backbone of the wastewater collection systems in many cities across North America. These pipes are in various stages of deterioration, generally due to microbiological induced corrosion and/or mechanical loading. A common method of rehabilitating these structures is the use of cementitious coatings. This paper describes the development and testing of three novel geopolymer mix designs prepared using metakaolin and fly ash (class C and F) precursors. Specimens prepared using Portland cement-silica fume blend were also tested for comparison purposes. The specimens were placed in several concentrations of sulphuric acid for a period of eight weeks. The corrosion resistance and remaining compressive strength of geopolymer mortar made from class F fly ash precursor were found to be substantially higher compared with the enhanced OPC formulation. The other geopolymer mix designs were found to perform equally or better compared with the OPC binary blend.