A Piecewise Grey System Model for Study the Effects of Anthropogenic Activities on Karst Hydrological Processes

Sustainable groundwater development must rely on a good understanding of hydrological processes, especially under effects of anthropogenic activities. This paper develops a piecewise analysis based on grey system model for study effects of anthropogenic activities on hydrological processes. The time series of precipitation and spring discharge were segmented into three time periods depending on whether variations are due to climate variation: the predevelopment stage, the transition stage, and the new equilibrium stage. Then we modeled hydrological process of the predevelopment stage and new equilibrium stage by the grey system model. By comparing the model results, we can quantify the effects of human activities on hydrological processes. We applied the model to Liulin Springs China. The results indicated that the hydraulic response time of the spring discharge to precipitation from the predevelopment stage to the new equilibrium stage, ranges from less than 1 year to up to 4 years. The results revealed that human activities slow the groundwater flow. GM (1,N) models of Liulin Springs discharge showed that the driving coefficients of precipitation to the spring discharge decreased from 0.012272 in the predevelopment stage to 0.007753 in the new equilibrium stage, which means that groundwater recharge ability has reduced about 36.82 %. Human activities in Liulin Springs have drastically changed the groundwater system. Piecewise grey system model is a robust method for hydrological process simulation.     

Facial expression recognition using radial encoding of local Gabor features and classifier synthesis

Primarily motivated by some characteristics of the human visual cortex (HVC), we propose a new facial expression recognition scheme, involving a statistical synthesis of hierarchical classifiers. In this scheme, the input images of the database are first subjected to local, multi-scale Gabor-filter operations, and then the resulting Gabor decompositions are encoded using radial grids, imitating the topographical map-structure of the HVC. The codes are fed to local classifiers to produce global features, representing facial expressions. Experimental results show that such a hybrid combination of the HVC structure with a hierarchical classifier significantly improves expression recognition accuracy when applied to wide-ranging databases in comparison with the results in the literature. Furthermore, the proposed system is not only robust to corrupted data and missing information, but can also be generalized to cross-database expression recognition.     

泡沫阻力因子和残余阻力因子预测模型

在均匀实验设计的基础上,通过spss软件,用逐步回归的方法拟合泡沫阻力因子和残余阻力因子与注入速度、渗透率、气液比、注入量和起泡剂浓度之间的关系式。     

欧盟东扩后中欧关系发展的阶段及特征分析

2004年5月欧盟经历了历史上规模最大的一次扩大,一次性吸收了来自中东欧和地中海的10个国家。这次扩大一般被称之为"欧盟东扩"。欧盟东扩标志着这个世界上经济一体化程度最高的区域性组织,在欧洲联合的道路上越走越远。然而欧盟在不断加深整合程度的同时,与我国之间的关系发展至今可谓一波三折。从欧盟东扩后的中欧关系来看,其发展阶段可分为三个主要时期,由此可观察出后金融危机时代中欧关系发展的诸多特征。     

粉煤灰在印染废水处理方面的应用研究

介绍粉煤灰在印染废水处理方面的研究及应用研究情况,指出处理工艺中的问题。     

全电动注塑机的特点及应用领域

重点分析了全电动注塑机与全液压注塑机的不同之处,简单地概述了国内塑料工业发展落后的现状以及把我国建成注塑机生产强国的突破口。详细介绍了全电动注塑机的应用领域,并展望了全电动注塑机的发展。     

工艺参数对TiO2碳热还原合成Ti（C,N）粉末的影响

本文探讨了ＴｉＯ２碳热还原法合成Ｔｉ（Ｃ，Ｎ）粉末过程中合成温度，保温时间，Ｎ２气流量，Ｃ／Ｔｉ比值等工艺参数的变化对粉末性状的影响，实验表明，Ｎ比Ｃ更易于Ｔｉ结合，改变工艺对数可调整Ｔｉ（Ｃ１－ｘＮｘ）的ｘ值。在１４００～１７００℃间可获得ｘ值的０．６～０．８５的Ｔｉ（Ｃ１－ｘＮｘ）粉末。     

高强度放电灯电子镇流器在城市照明中的应用

本文介绍了HID电子镇流器在城市照明中的节能应用。     

Note on filon-type integration for higher order exponential time differencing methods in stiff systems

The Filon-type quadrature is efficient for highly oscillatory functions — Fourier transforms. Based on Cox and Matthews’ ETD schemes, the higher order single step exponential time differencing schemes are presented based on the Filon-type integration and the A-stability of the two-order Adams-Bashforth exponential time differencing scheme is considered. The effectiveness and accuracy of the schemes is tested. Foundation item: Projects(02JJY2006, 03JJY2001) supported by Natural Science Foundation of Hunan Province; project supported by JSPS Fellowship Research Program     

边界点集规划与注塑模具浇口位置的优化

根据平衡流动路径特点，提出了以理想流动模式为目标、基于制件边界几何信息的浇口位置优化选取的原则；并以平板制件单浇口注射成型工艺为例，研究了最佳浇口位置的描述方法并建立了相应的数学模型，给出了优化算法及制件边界特征点集的规划提取方法；根据所建数学模型和所选用优化计算方法，开发了相应的计算软件，经实例验证，算法和模型可靠。