城市道路绿地设计中绿视率的应用

分析了城市道路绿地的界定及城市道路绿地在城市中发挥的作用,论述了道路空间特殊的动态观赏方式是绿视率的一个基本特征,结合沈阳市城市道路绿地设计,提出了提高绿视率可采取合理配置常绿针叶植物、优化绿地植物、强化垂直绿化和立体绿化等措施。     

"计算机组装与维护"课程分层次教学改革

专科计算机专业将"计算机组装与维护"课程作为专业基础课、部分本科院校将其作为选修课,一般按实践性课程组织教学.实际上"计算机组装与维护"依据计算机使用者不同,应以教材改革为突破口、以理论教学为导向、开展分层次教学,满足不同层次人群的不同需求,实现人与计算机的和谐适应.     

比光谱-导数分光光度法在多光谱成像技术上的应用

针对基于Kubelka-Munk理论光谱反射比重建算法中获得浓度矩阵难的技术环节,提出了一种全新的光谱反射比的重建方法——基于比光谱-导数分光光度法的光谱反射比重建算法,并以获取二元混合颜料样本颜色信息为例,证明了此算法的可行性.     

基于改进阈值函数的小波去噪算法研究

为更好地消除心电信号（ECG）处理过程中存在的基线漂移、工频干扰和肌电干扰等噪声,提出一种基于改进小波阈值的去噪算法。该算法选定 coi5 作为小波基进行分解,选取分解尺度为 8 层,使用改进的阈值选取方法对每一层信号系数进行去噪。该阈值函数不仅克服了硬阈值函数不连续的缺点,而且解决了软阈值函数存在的恒定偏差,同时具有良好的自适应性。实验结果表明,该方法与传统阈值法相比,信噪比提高了24.26%,均方误差降低了 21.42%;与当前国际上先进的去噪算法相比,信噪比提高了 2.01%,均方误差降低了6.9%,去噪效果显著提升,验证了该算法的有效性。     

两种液体折射率测量方法的比较

对两种测量液体折射率方法（掠射法和用牛顿环测干涉条纹半径）的理论与实验结果的比较，辨别测量液体折射率方法的优劣。     

The Illusion of Linearity: Expanding the evidence towards probabilistic reasoning

Previous research has shown that – due to the extensive attention spent to proportional reasoning in mathematics education – many students have a strong tendency to apply linear or proportional models anywhere, even in situations where they are not applicable. This phenomenon is sometimes referred to as the ‘illusion of linearity’. For example, in geometry it is known that many students believe that if the sides of a figure are doubled, the area is doubled too. In this article, the empirical evidence for this phenomenon is expanded to the domain of probabilistic reasoning. First, we elaborate on the notion of chance and provide some reasons for expecting the over generalization of linear models in the domain of probability too. Afterwards, a number of well-known and less-known probabilistic misconceptions are described and analysed, showing that they have one remarkable characteristic in common: they can be interpreted in terms oft he improper application of linear relations. Finally, we report on an empirical investigation aimed at identifying the ability of 10^th and12^th grade students to compare the probabilities of two binomial chance situations. It appears that before instruction in probability, students have a good capability of comparing two events qualitatively, but at the same time they incorrectly quantify this qualitative insight as if the variables in the problem were linked by a linear relationship. Remarkably, these errors persist after instruction in probability. The potential of this study for improving the teaching and learning of probability, as well as suggestions for further research, are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.     

有机磷及氨基甲酸酯类农药残留现场检测方法可靠性研究

参照国标GB／T5009．199-2003《蔬菜中有机磷和氨基甲酸酯类农药残留量的快速检测法》，对现场残留农药测定仪的仪器精密度以及检出限进行了测定，并分析了该仪器对各种农药的最小检测浓度。发现该仪器对部分农药。如敌敌畏、呋喃丹、速灭威以及残杀威有很好的检出灵敏度，但对甲胺磷的检出灵敏度最差；同时环境温度对检测结果也有一定的影响。因此。在规范实验操作的前提下，对不同的农药选择最合适的方法，才能保证检测数据的准确性和可靠性。     

大变形条件下材料力学性能研究

对不同应变张量描述下的体积比受变形程度及泊松比的影响进行了分析，结果表明：在Lagrangian应变张量与Almansi应变张量及Eulefian应变张量描述下，假定泊松比不变，大变形时都会出现体积变化反常的现象；在对数应变张量描述下，当泊松比取值0．5时，变形过程中材料体积一直保持不变，能满足材料不可压缩这一假定。     

添加剂和升温速度对Si_3N_4陶瓷显微结构的影响

本文研究了添加剂种类和升温速度对气压烧结Si_3N_4陶瓷显微结构的影响。结果表明:只加入Sc_2O_3,升温速度对β—Si_3N_4晶体生长影响甚微。同时加入Sc_2O_3和ZrO_2,升温速度对β—Si_3N_4的晶体形貌影响显著。慢速升温可有效地提高β-Si_3N_4晶体的长径比,并形成长径比大的大晶体镶嵌在细小晶体群之中的显微结构。     

降低本钢五高炉焦比的实践

2006年公司计划铁工序能耗为425kg／t,焦比为410kg／t。影响生铁成本的各个因素中,降焦是降成本的重要手段之一,其效果也最明显的,特别是针对本钢而言,降焦比的潜力相对是较大的。五高炉通过优化操作参数、提高原燃料质量和冷却水的管理,不仅稳定了高炉顺行同时也达到了较低焦比的目的。