基于面向分类准则的维数约简及其在人脸识别中的应用

针对高维数据导致的维数灾难问题,提出了一种基于面向分类准则的维数约简方法。所提准则使每个训练样本在特征空间中与同类样本尽可能接近,而与异类样本尽可能疏远。首先对每个训练样本定义同类样本加权平均距离和异类样本加权平均距离。然后基于上述两个概念分别定义总体同类距离和总体异类距离。以最小化总体同类距离和最大化总体异类距离为目的提出了面向分类的准则(Classification Oriented Criterion,COC)。最后,基于面向分类的准则推导出了一种新的维数约简方法。在公共人脸数据库ORL和Yale上的实验表明所提方法性能优于有代表性的维数约简方法。     

Oxidation by UV and Ozone of Organic Contaminants Dissolved in Deionized and Raw Mains Water

Organic contaminants dissolved in deionized pretreated and raw mains water were reacted with ultraviolet light and ozone. Ozone first was used for partial oxidation followed by ozone combined with ultraviolet radiation to produce total oxidation. The reduction of TOC level and direct oxidation of halogenated compounds were measured throughout the treatment process. The rate of TOC reduction was compared for ozone injected upstream and inside the reactor.     

Effects of Refractories on the Total Oxygen Content and Inclusions in the IF Steel

The effects of refractories of quarz-corundum consisting of 45 mass% quartz and 55 mass% corundum,fused corundum and fused magnesia on the total axygen content(TOC) and the composition of inclusions in intersitital free(IF) steel were studied,3 mass% microsilica was added into the three refractories as binder.The refractories were shaped as lining of the graphite crucible by castable method IF steel was placed in the crucibles,then they were heated at 1600℃ for 90min and 45min respectively.Oxygen contents of the steel samples were obtained by axygen determinator.Inclusions were analyzed by SEM and EDS.The results show that the TOC of steel increase with ncrease of Index of Oxygen Potetial (IOP) of the refractories.The steel sample coped with MgO refractories having the lowest IOP has the lowest TOC.     

高分子助剂处理造纸污水的应用研究

采用动态滤水仪模拟造纸湿部滤水成型过程，对高分子助剂在木浆纸污水处理过程中的影响进行了初步的探讨。结果表明，对于木浆造纸污水，两性淀粉、阳离子聚丙烯酰胺、高分子助留剂SG01均能显著降低污水中的总固形物含量，污水的CODCr值也有一定程度的降低，添加1％的两性淀粉、150～200g／t的阳离子聚丙烯酰胺或0．9％的高分子助留剂SG01时，可使污水中的总固形物含量降低40％～55％；而CODCr的去除率则在40％～58％左右。     

校园卡充值点最优位置的数学模型研究

选址问题目前学术界已有较多的研究成果,但大多数是将总费用作为目标函数,一般要求事先给出网络结点的位置坐标,且无需考虑结点间的最短路程,旨在确定新的地理几何中心。而对已有网络,在不改变原有路径及各结点位置的条件下,以总路程最小为目标函数,在现有网络结点中寻找其中某些结点的最优位置却是一个新的研究课题。本文以某高校校园卡充值点为例,将校园示意图转化为赋权连通图,求得该连通图的邻接矩阵,利用Floyd算法及图论软件包构造一个最短路径矩阵,得到一个赋权完全图,利用穷举法或混合整数规划法及数学软件求解,得到各学院、楼栋、学生宿舍区到三个校园卡充值点的最短总路程及三个校园卡充值点的最优位置。     

GM（1，1）模型在广西糖产量预测中的应用

在分析广西糖业发展的基础上,以实际数据为基础,建立了广西糖产量灰色预测模型,并将模型应用于广西未来糖产量的预测,认为该模型可用于对广西区糖产量进行预测.该模型误差较小,对决策有一定的参考价值.     

木糖醇的合成、应用及市场前景

介绍了木糖醇主要的两种合成方法：化学法和微生物法；对其在食品、医药等行业中的应用进行了阐述，并论述了木糖醇的市场前景。     

甜菜雄性不育系及保持系花期蛋白差异分析

为揭示甜菜雄性不育的原因,从蛋白质组学角度对甜菜细胞质雄性不育进行研究,利用双向电泳与MALDI-TOF-MS方法,对Owen型甜菜质核互作型雄性不育系DY5-CMS及同型保持系DY5-O花粉发育3个阶段(雄蕊原基分化期、四分体时期和单核时期)的花蕾蛋白差异表达进行研究．结果表明： 在雄蕊原基分化期花蕾中鉴定出6个差异蛋白,在四分体时期鉴定出4个差异蛋白,这些蛋白多数与呼吸和能量代谢有关,推测甜菜细胞质雄性不育可能是花粉发育早期(雄蕊原基分化期和四分体时期)与能量和呼吸代谢有关的蛋白表达上调导致呼吸和能量代谢紊乱造成的;在花粉发育的单核时期鉴定出6个差异蛋白,这些蛋白主要与植物的光合作用有关,推测到花粉发育后期雄性不育性状已形成,雄性不育导致植物光合机能下降．     

A Cross-sectional Study on the Relationship Between Homocysteine and Lipid Profiles Among Chinese Population from Hunan

Previous studies have explored the relationship between homocystein (Hcy) and lipid profiles. However, the results from these studies have been inconsistent. The current study investigated the correlation between Hcy and lipid profiles in Chinese community-based population. The participants were composed of 4012 Chinese people aged 30–92 years old, who were recruited from rural and urban communities in the Hunan Province. Non-parametric test and logistic regression were used to examine the distribution of Hcy and lipid profiles (triglyceride [TG], total cholesterol [TC], low-density lipoprotein cholesterol [LDL-C], high-density lipoprotein cholesterol [HDL-C]) and the relationship between them. The median age of subjects was 54.50 years old, and 40.98% were male. Median Hcy was 13.20 μmol/L, and 35.39% had hyperhomocysteinemia (HHcy). Median TG was 1.51 mmol/L, TC was 4.77 mmol/L, LDL-C was 2.62 mmol/L, and HDL-C was 1.27 mmol/L. In multivariable logistic regression analysis, HHcy was associated with high levels of TG (OR_male = 2.240, p < 0.001; OR_female = 2.539, p < 0.001), TC (OR_male = 2.237, p < 0.001; OR_female = 2.202, p < 0.001), and LDL-C (OR_male = 1.413, p = 0.010; OR_female = 1.617, p < 0.001) in the different sexes population and low level of HDL-C in females (OR = 1.326, p = 0.023) after adjusting for confounders. HHcy was independently associated with an increasing risk of low HDL-C among females. The regression analysis showed that HHcy was also associated with hypertriglyceridemia, hypercholesterolemia, and high level of LDL-C in males and females from Chinese community-based population, which provides a basis for the treatment and prevention of abnormal lipid metabolism.     

铸造亚共晶铝硅合金绿色化规划探讨

根据绿色化思想，对铸造亚共晶铝硅合金进行了绿色化规划探讨。现有的铝硅合金牌号过多，以铸造亚共晶铝硅合金为例，中国至少有11种牌号，美国有14种，俄罗斯有16种，日本有11种。同时，这些合金的性能大多相互覆盖。这为材料选择，加工，管理和回收带来诸多不便。为了解决这些问题，规划出两种牌号，足以满足一般的要求，一种为低成本，中等性能合金（σb=150-200MPa,δ5＝1.0%-4.0%，如美国的356．0或中国的ZL101）；另一种为中等成本，中高性能合金（σ＝200－420MPa,δ5=2.0%-8.05,如我国新近开发的ZL120）。