YAG：Ce Phosphors for WLED via Nano-Pesudoboehmite Sol-Gel Route

The sub-micron sized YAG ： Ce phosphors were synthesized via a modified sol-gel method by peptizing nano-pesudoboehmite particulate. It is found that YAG phase from the dried gel powders appears at 1000 ℃ then the pure YAG phase exists at a relatively lower sintering temperature of 1400 ℃. The smaller sizes of phosphors in the ranges of 1 - 3 μm are obtained due to the contribution of seeding effects of nano-sized alumina particles to strengthen each step of the processes. Both the excitation and emission spectra of photoluminescence of the phosphor obtained at 1400 ℃ meet well with the spectroscopic requirements of the WLED phosphors.     

郁江梯级水电站群联合优化调度初探

郁江梯级水电站群由西津、仙依滩和桂航3座水电厂组成。针对西津电厂出力变化频繁,加上西津下游两电厂装机容量较小,经常出现弃水,用增量动态规划法进行了联合优化调度探索,同时介绍马斯京根分段流量演算法。     

粒子群优化算法及其应用

粒子群优化（PSO）算法是一种新颖的演化算法，它属于一类随机全局优化技术，PSO算法通过粒子间的相互作用在复杂搜索空间中发现最优区域。PSO的优势在于简单而又功能强大。介绍了基本的PSO算法、研究现状及其应用，并讨论将来可能的研究内容。     

引黄入晋工程"TBM"掘进引水隧洞塌方处理

本文叙述了在山西万家寨引黄入晋工程中总干线7号隧洞用T BM掘进后洞中心线出现较大超差,在处理施工中土体又发生塌方,经采取塌方段两端先加强支护,用平行梁递进法封闭顶拱,再用小导管灌浆加固未塌方段土体,然后继续进行作业的塌方处理过程。。     

动态电接触模拟测试系统

为研究微动引起的失效机理,本文设计并研制了动态电接触模拟测试系统,用于模拟连接器微动过程,测试微动过程中触点的电性能.文章介绍了该系统的构成、功能、工作原理,并给出了微动、加力装置、计算机软件控制等主要部分的设计方案.     

Thermo-acoustic instability in the horizontal Rijke tube

The instability curve of a Rijke tube system was obtained accurately by following different paths of heat power and flow-rate for three regions and by defining its locus from the criterion based on the measured sound pressure levels. The unstable limits in the region of flow-rate lower than that at the minimal power are compared with previous data. To observe the effect of turbulence on the unstable limits, inflow turbulence was introduced by placing a bundle of circular cylinders upstream of the heating part (50< Re_d< 700). The large-amplitude inflow fluctuation may delay the transition of the chamber acoustic mode to the unstable zone even at a sufficient power.     

建筑结构爆破震动效应及安全分析研究

从现代爆破作用原理出发。对岩体爆破的振动特性，影响因素及最新研究进展作了综合评述。并通过大量科研观测资料分析。结合我国某些工程实践经验。着重介绍了岩土爆破对闸坝工程，水工隧洞的作用特性。破坏机制和安全准则。     

6to4与ISATAP技术相结合的IPv6网络实现

在IPv4向IPv6过渡期间,多种过渡技术可以互相支持、互相组合使用,以达到互利互助。简要介绍了其中2种隧道技术:6to4技术和ISATAP技术,提出了1种基于两者结合的新型实验网络的实现方案。具体讨论了在Linux下如何组建这种新型实验网络平台,详细阐明了如何配置IPv6主机以及双栈路由器,为IPv4过渡到IPv6提供1个可行的方案。     

变母体产品可靠性评估方法

产品在不同阶段的技术状态是有差异的，因此在可靠性评估时不能视为同一母体，其试验数据也不能做简单的累加处理。由于试验次数较少，在进行可靠性评估时，评估值往往低于应达到的实际值。本文将各阶段的可靠性作为一个整体来研究，建立了可靠性增长评估的数学模型，导出了成败型可靠性评估方程，给出了评估方法，该方法充分利用各研制的试验信息，反映了研制产品的可靠性增长过程，为多研制阶段、变母体、试验数据较少的产品可靠性验证，提供了有效的评估途径，同时以产品数据为例计算了应达到的实际可靠性水平，计算结果表明，评估结果与产品应达到的可靠性水平基本相同。     

Estimation of collapse moment for the wall-thinned pipe bends using fuzzy model identification

In this work, the collapse moment due to wall-thinned defects is estimated through fuzzy model identification. A subtractive clustering method is used as the basis of a fast and robust algorithm for identifying the fuzzy model. The fuzzy model is optimized by a genetic algorithm combined with a least squares method. The developed fuzzy model has been applied to the numerical data obtained from the finite element analysis. Principal component analysis is used to preprocess the input signals into the fuzzy model to reduce the sensitivity to the input change and the fuzzy model are trained by using the data set prepared for training (training data) and verified by using another data set different (independent) from the training data. Also, three fuzzy models are trained, respectively, for three data sets divided into the three classes of extrados, intrados, and crown defects, which is because they have different characteristics. The relative root mean square (RMS) errors of the estimated collapse moment are 0.5397% for the training data and 0.8673% for the test data. It is known from this result that the fuzzy models are sufficiently accurate to be used in the integrity evaluation of wall-thinned pipe bends and elbows.