考虑底坡影响下的明渠恒定非均匀流水力计算公式研究

考虑底坡影响的条件下,利用均值不等式对明渠恒定非均匀流最小断面比能和临界水深的计算公式进行改进,并附以算例验证。通过对改进前后两种方法的比较,结果表明:采用改进后的计算方法较之传统计算方法得到的临界水深偏大,最小断面比能偏小。改进后的公式利用均值不等式理论简化了计算过程,且考虑底坡影响下的结果更为精确,可靠度更高。这一改进过程从理论上阐述了数学方法在水力学分析中应用的可行性,同时也为水力学课程教学与工程实际计算提供了新的指导思路和简便的解决途径。     

复合型粉煤灰早期活性激发剂的研制

从24种可能具有激发粉煤灰早期活性的试剂中，采用单组分比选、双组分配伍及正交优化掺量的技术途径，配制了3种效果显著的激发剂配方，并将其应用于高掺量粉煤灰混凝土的室内试验中，且激发效果良好．根据粉煤灰-水泥浆体的扫描电子显微镜图像，探讨了粉煤灰活性激发剂的激发机理．     

黄河沙坡头水利枢纽导流明渠的消能布置

黄河沙坡头水利枢纽导流明渠下游的消能型式由物理模型试验所得，是一项在低佛氏数条件下的二级消能方法的成功实践。在明渠出口处采用二级消能方法，同时结合扩散消能措施，有效地解决了明渠水流的消能问题，使明渠水流与下游河道得以很好地衔接，同时，该方案也为工程节省了大量投资。     

急流弯道双曲底板的体形设计

本文提出采用双曲底板的方法消除急流渠道弯段的冲击波。在柱面座标系中建立不可压缩粘性流体的运动方程，导出无量纲形式的自由水面方程并建立了相应连续性方。通过迭代法求解自由水面方程并计算出自由水面高程，由连续性方程求出水流深度。从水面高程中减去水深得出底板高程。文中给出了按此方法设计的马河水库溢洪道弯道段水流计算结果。结果证明渠道内水面平稳，没有发生冲击波。底板设计由编程计算完成。     

三峡库区重庆主城区河段河床演变分析

三峡工程建成后,重庆主城区河段处于水库变动回水区,水流条件和泥沙运动规律将发生变化,该河段泥沙冲淤变化的分析研究,备受有关方面关注。根据2007年及多年所监测的来水来沙资料及河道观测资料,对重庆主城区河段的泥沙冲淤变化规律进行初步分析,结果表明：重庆主城区河段冲淤量主要与来水来沙条件、河道形态、两江相互顶托等因素有关;2007年重庆主城区河段冲淤主要分布在开阔段的缓流、回流区等部位;主要淤积期为6月中旬至7月中旬、9月中旬至11月中旬,主要冲刷期分别为年初至6月中旬、8月中旬至9月中旬、11月中旬至年末;全年略呈冲刷态势。     

自动化立体仓库模拟系统软件设计

介绍自动化立体仓库模拟系统中的软件设计。提出软件的总体设计思路,列举了系统的各功能模块,具体分析了通讯接口电路及程序实现,并介绍了软件设计中的重点及难点。     

学习型供应链对供应链应急管理的作用分析

从专注于失败、反对简单化解释、敏锐关注运作过程、注重回应力、遵从专家意见这五个高可靠性组织特征的角度出发,分析了学习型供应链能够有效应对突发事件,从而保证供应链运作的高可靠性。     

MONETARY TRANSMISSION MECHANISM IN CENTRAL AND EASTERN EUROPE: SURVEYING THE SURVEYABLE

Abstract.  This paper surveys recent advances in empirical studies of the monetary transmission mechanism, with special attention to Central and Eastern Europe (CEE). Our results indicate that the strength of the exchange rate pass-through substantially declined over time mainly due to a fall in inflation rates and to some extent due to the so-called composition effect. The asset price channel is weak and is likely to remain weak because of shallow stock and private bond markets and because of low stock and bond holdings of domestic households. House prices may become an exception with booming mortgage lending and with high owner occupancy ratios. While the credit channel could be a powerful channel of monetary transmission – as new funds raised on capital markets are close to zero in CEE – it is actually not, as both commercial banks and non-financial corporations can escape domestic monetary conditions by borrowing from their foreign mother companies. The moderately good news, however, is that those banks and firms are influenced by monetary policy in the euro area because their parent institutions are themselves subjected to the credit channel in the euro area.     

The managerial flash sales dash: Is there advantage or disadvantage at the finish line?

The central intent of this qualitative inquiry is to investigate the benefits, drawbacks, and performance measures of hotel room inventory distribution via flash sales websites. Key advantages and disadvantages of using such a distribution channel fall within the categories of inventory management, revenue management, brand marketing, customer relationships, and operational challenges. The significance of the study is in providing a comprehensive review of the flash sales phenomenon in the lodging industry that may assist hotel managers with the performance evaluation of this distribution channel. Using grounded theory methodology, a flash sales evaluation framework was developed based on 46 phone interviews with hotel managers from different segments of the American hotel industry.