计算机考试数据分析中数据挖掘技术的应用

我院考试系统经过一年多的实际运用获取大量的、具体的考试数据,采用数据挖掘方法中的交叉表分析和相关分析获得相关的分析结果将有助于完善计算机教学计划的更好实施.通过分析笔者提出今后在运用数据挖掘技术时的建议和策略.     

Millimeter-wave radiometer diagnostics of harmonic electron cyclotron emission in the Levitated Dipole Experiment

A 110/137 GHz radiometer pair with collimated antenna pattern is being used to diagnose optically thin harmonic electron cyclotron emission from hot electrons in LDX. Signal levels of 0.1-1 keV and 110/137 ratios of 2-4 stationary with ECRH power have been observed. The large plasma core magnetic field gradient causes all relevant harmonics to be simultaneously viewed over a angle(k,B) angular range of 0°-90° representing a unique geometry for interpretation of ECE in terms of hot electron temperature and density.     

国外专利文献

菜籽或动物源的燃料油的冷流改进剂；制备1，3-丁二醇的方法；丙酮的生产过程；连续羰基化过程；生产维生素A醋酸酯的方法；制备2-羟基粒酸的过程[编按]     

Characterization, identification of ambient air and road dust polycyclic aromatic hydrocarbons in central Taiwan, Taichung

The concentrations of ambient air polycyclic aromatic hydrocarbons (PAHs) were measured simultaneously in an industrial area (Taichung Industrial Park, TIP) and suburban area (Tunghai University, THU) in central Taiwan, Taichung. A total of samples were collected simultaneously at the two sites between August 2002 and March 2003. Particle-bound PAHs (p-PAHs) were collected on quartz filters and gas-phase PAHs (g-PAHs) on glass cartridges using polyurethane foam sampler, respectively. Both types of samples were extracted with dichloromethane/n-hexane mixture (50/50, v/v) for 24 h, then the extracts were subjected to gas chromatography/mass spectrometric analysis. Moreover, the roadside dust particle PAHs composition were also collected and analyzed at TIP, THU and traffic road sampling sites. The five main road lines in Taichung City were selected as traffic road sampling sites. Correlation studies between PAHs concentrations and meteorological parameters were revealed that temperature has greater effects (P>0.6) than other meteorological parameters such as wind speed, relative humidity and atmospheric pressure on g-PAHs and p-PAHs. PAHs sources were resolved by using principal component analysis and diagnostic ratios. The major sources of PAHs were combustion, traffic vehicle exhaust (diesel and gasoline engine), incinerator and industrial stationary sources at both sampling sites in central Taiwan.     

广西电网公司在首届南网＂服务之星＂大赛中夺冠

8月28日,首届南方电网公司“服务之星”大赛决赛在广州市落下帷幕。     

The effect of polymer coatings on proton transverse relaxivities of aqueous suspensions of magnetic nanoparticles

Iron oxide magnetic nanoparticles are good candidates for magnetic resonance imaging (MRI) contrast agents due to their high magnetic susceptibilities. Here we investigate 19 polyether-coated magnetite nanoparticle systems comprising three series. All systems were synthesized from the same batch of magnetite nanoparticles. A different polyether was used for each series. Each series comprised systems with systematically varied polyether loadings per particle. A highly significant (p < 0.0001) linear correlation (r = 0.956) was found between the proton relaxivity and the intensity-weighted average diameter measured by dynamic light scattering in the 19 particle systems studied. The intensity-weighted average diameter measured by dynamic light scattering is sensitive to small number fractions of larger particles/aggregates. We conclude that the primary effect leading to differences in proton relaxivity between systems arises from the small degree of aggregation within the samples, which appears to be determined by the nature of the polymer and, for one system, the degree of polymer loading of the particles. For the polyether coatings used in this study, any changes in relaxivity from differences in water exclusion or diffusion rates caused by the polymer are minor in comparison with the changes in relaxivity resulting from variations in the degree of aggregation.     

那些体验式营销易忽略的闪光点

终端体系是作为市场环境中最低成本的消费者接触点,长久以来得到了众多厂家的青睐。然而随着市场供需关系的变化,面对着越来越多的同质化产品和同质化的售卖方式,让销售变得越来越困难。经济市场化后,商品的使用价值变得次要,获取产品变得简易,如何增加消费者购买的乐趣就变得特别重要。单纯的购买过程中没有创造任何价值,会使产品价格逐步降低。     

聚缘生物 创领低度保健酒潮流

8月26日,辽宁聚缘生物科技有限公司（以下简称“聚缘生物”）举办的“缘聚鞍山·共享生命艺术盛宴——养生文化盛典暨聚缘生物科技有限公司品牌上市推介发布会”在辽宁鞍山开幕,由聚缘生物历时三年半研发的五味子人参低度保健酒正式面向市场。