Throughput analysis for multicast switches with multiple input queues

This letter analyzes the saturated throughput for multicast switches with multiple input queues per input port. Under the assumptions of a Poisson uniform traffic model and random packet scheduling policy, we derive the multicast switch saturated throughput under different fanouts. To verify the analysis, extensive simulations are conducted with different switch sizes and fanouts. It is shown that the theoretical analysis and the simulation results have a discrepancy less than 1.9%. Results from this letter can be used as a guidance to design the optimal queuing for multicast switches.     

镁电解法生产节能降耗的途径

结合抚顺铝厂镁分厂引进消化世界镁生产先进技术——— 10 5kA镁无隔板电解槽稳定生产两年多的实践 ,客观地分析了电解法生产可降低氯耗和大幅度节电 ,证实了采用无隔板电解槽是镁电解法生产降低消耗 ,节约能源的有效途径     

燃气轮机排气温度异常检测及诊断

针对燃气轮机运行过程中的健康维护问题,提出了一种基于模糊C均值聚类的燃气轮机排气温度异常检测方法。以某型工业燃气轮机为例,采用模糊C均值聚类算法对排气温度的监测数据进行了聚类分析,得到了燃气轮机不同运行状态下的排气温度特征模式,并在此基础上实现了燃气轮机排气温度异常状态下的故障诊断分析。研究结果表明,燃气轮机甩负荷及其热通道部件的损坏失效均能够对排气温度产生不同程度的影响,模糊C均值聚类算法可以有效实现燃气轮机排气温度的异常检测,为燃气轮机性能退化预测及故障诊断提供决策参考。     

Information diffusion-based spatio-temporal risk analysis of grassland fire disaster in northern China

This study presents a Geographical Information Systems (GIS) and information diffusion-based methodology for spatio-temporal risk analysis of grassland fire disaster to livestock production in the grassland area of the northern China. We employed information matrix to analyze and to quantify fuzzy relationship between the number of annual severe grassland fire disasters and annual burned area. We also evaluated the consequences of grassland fire disaster between 1991 and 2006 based on historical data from 12 northern China provinces. The results show that the probabilities of annual grassland fire disasters and annual damage rates on different levels increase gradually from southwest to northeast across the northern China. The annual burned area can be predicted effectively using the number of annual severe grassland fire disasters. The result shows reliability as tested by two-tailed Pearson correlation coefficient. This study contributes a reference in decision making for prevention of grassland fire disaster and for stockbreeding sustainable development planning. The fuzzy relationship could provide information to make compensation plan for the disaster affected area.     

Citrate-Gel Synthesis and Luminescent Properties of α-Zn3 （PO4）2 Doped with Eu^3＋

By using inorganic salts as raw materials and citric acid as complexing agent, α-Zn3(PO4)2 and Eu^3 doped α-Zn3( PO4)2 phosphor powders were prepared by a citrate-gel process. X-ray diffraction (XRD), TG - DTA, FF - IR and luminescence excitation and emission spectra were used to characterize the resulting products. The results of XRD reveal that the powders begin to crystallize at 500℃ and pure α-Zn3(PO4)2 phase is obtained at 800℃. And the results of XRD reveal that Eu^3 exists as EuPO4 in the powder. In the phosphor powders, the Eu^3 shows its characteristic red-orange(592 nm, ^5D0 -^7F1) emission and has no quenching concentration.     

Feature extraction of hyperspectral images with a matting model

Owing to the limitations of the imaging sensor and theoretical aspect, hyperspectral images (HSIs) are contaminated with some unwanted components such as noise and a lack of spatial information. This article proposes a spatial–spectral feature enhancement model to eliminate interference, modify spectral distortion, and increase the useful features. The framework firstly proposes an effective spatial feature-based strategy for selecting a band with the most edge information to serve as alpha channel. Given the alpha channel, the continuous foreground and background are estimated by the closed form solution. Finally, feature-enhanced HSI is obtained by linearly combining the selected band, hyper foreground and background. Experimental results of the ground-based data and remotely sensed data indicate that the proposed feature enhancement algorithm provides effective performance in enhancing spatial–spectral features and reducing noise. Especially, the feature-enhanced data have positive influence on both unmixing and classification.     

长螺旋成孔灌注桩在邯钢435m2烧结机工程上的应用

介绍了长螺旋成孔振捣插筋后压浆工艺,该工艺是在长螺旋成孔工法的基础上增加了振捣插筋和孔底注浆两个重要环节.这种不同工艺的组合通过试验大幅度提高了单桩承载力和变形要求,并使桩身强度得到了极大的利用,该工艺具有良好的应用价值和使用前景.     

浅谈我国工程造价咨询业的发展

随着我国市场经济建设的发展，在工程建设领域里，工程造价咨询发挥着关键作用，行业自身也得到了快速提升，但同国外相比，还存在不小的距离。本文探讨了我国工程造价咨询业的发展方向。