Using evolutionary computation to solve problems in nonparametric regression

This paper studies evolutionary mechanism of parameter selection in the construction of weight function for Nearest Neighbour Estimate in nonparametric regression. Construct an algorithm which adaptively evolves fine weight and makes good prediction about unknown points. The numerical experiments indicate that this method is effective. It is a meaningful discussion about practicability of nonparametric regression and methodology of adaptive model-building. Supported by the National Natural Science Foundation and 863 High Technology Project of China Ding Lixin: born in 1967, Ph.D. graduate student     

农村供水工程树枝状配水管网水力计算简法

采用“最高用水量法”对农村供水工程中的树枝状配水管网进行水力计算 ,简化了计算程序。此法曾应用于日本国无偿援助“贵州农村饮水供应改善项目”的 30 0多座农村水厂的设计和技术审批。应用表明 ,用“最高用水量法”进行水力计算所建的农村水厂配水管网运行效果与设计相符 ,能有效地控制和把握建设农村水厂的技术经济指标 ,是农村树枝状供水管网水力计算的简捷方法。     

Insect behavior at the leaf surface and learning as aspects of host plant selection

Summary Direct observations on the feeding behavior of insect herbivores are uncommon, but important. The important aspects of host-plant selection by phytophagous insects that have been revealed by such observations are the role of chemicals in the leaf surface, and learning. There are few detailed reports of behavior at the leaf surface, but these indicate that many, if not all, insects exhibit behavior pattenrs that can be interpreted as an examination of the quality of the surface and acceptance or rejection may follow without further testing. A number of experiments show that chemicals from the leaf surface commonly contribute to the acceptability or otherwise of a plant and in most cases so far the active chemicals are of widespread occurrence, not having a specific association with the host plant. Some experiments show that the association between surface chemicals and plant palatability is learned, but in other cases there is evidence of an innate response. Habituation to deterrent chemicals has been demonstrated in the laboratory, but not in the field. Food aversion learning also occurs and may be important in dietary switching by polyphagous insects.     

USING ENZYME TO IMPROVE THE QUALITY OF SECONDARY FIBER

INTRODUCTIONIn recent years, the secondary fibers have played more important role in paper industry, especially for China, which has less forest area than other countries. However the recycled fibers have lower freeness and strengths than virgin fibers, and the low pulp freeness limits the speed at which the paper machine can operate, lower strengths limits the use of recycled fibers in fine paper [1].Many techniques have been studied for these defects. Refining or beating tends to optimi…     

贵州省科技馆多功能厅预应力井字梁结构设计

贵州省科技馆多功能厅平面尺寸24 m×25.2 m,层高5.85 m,由于布展净高的需要、梁裂缝和挠度的控制等因素,屋面采用了无粘结预应力井字梁体系.在此基础上对结构计算、材料、预应力工艺、截面配筋及一些问题进行了探讨及分析处理.     

复合砂浆钢筋(丝)网加固RC梁受弯研究

采用无机材料高性能复合砂浆钢筋(丝)网加固混凝土梁,通过10根三面U形(在梁的受拉面和侧面进行加固)加固的混凝土梁和2根没有加固的对比梁的试验,研究了这种加固技术对钢筋混凝土梁的影响和作用,并比较了一次受力和二次受力的不同.与对比梁相比,采用高性能复合砂浆钢筋(丝)网加固的试件裂缝宽度和间距有较大幅度的减小,刚度有明显的提高,受弯极限承载力有很大的增加.在平截面假定的基础上求出试件的极限承载力,与试验结果相比有较好的吻合.     

R134a在螺旋管内的流动沸腾传热

制冷剂R134a作为CFCs类工质的替代物已经投入商业应用,螺旋管具有传热效率高、结构紧凑等优点,在各种工业领域中被广泛使用,研究R134a在螺旋管内的流动沸腾传热性能对制冷系统中新型蒸发器的设计具有重要意义。实验测量了R134a在管内径10mm,螺旋直径180mm,螺纹节距50mm的紫铜螺旋管内的流动沸腾传热系数。实验段外缠电阻丝加热,热流密度q=3-21.2kW/m^2,质量流量G＝150－420kg/(m^2.s)。实验表明,由于二次流的存在,螺旋管对流动沸腾传热具有一定的强化作用,而且在低干度区的强化效果比高干度区更好。     

利用永久磁场抑制中子管中的电子电流

讨论密封式中子管中抑制二次电子的几种方法．对Philip型中子管,用永久磁块抑制二次电子时得到中子产额是不加磁块时中子产额的1．33倍．     

关于中专实施学生评价体育教师教学的研究

探讨中专学生、体育教师对于学生参与体育教师教学评价的看法.采用质与量并进的研究方法,对某地区12所中专院校的72位体育教师和200名学生进行调查,学生部分以问卷方式进行资料收集,体育教师部分采用半开放式与开放式题型,以访谈方式进行资料收集,最后整理问卷和访谈资料,并对资料进行分析研究.     

柏科四种植物次生韧皮部的比较解剖

在光学显微镜下,比较观察了四种柏科植物茎次生韧皮部的结构,主要结果：１） 柏科植物茎次生韧皮部轴向系统由筛胞,韧皮部薄壁细胞,韧皮纤维（有些种有径向片）组成,径向系统为射线,各组成细胞以单层呈切向带相间排列;２） 根据径向片的有无,纤维细胞种类及树脂道的类型可将侧柏亚科的侧柏与圆柏亚科的其它三个种区分开;３） 圆柏亚科的次生韧皮部中树脂道的形成方式与通常的不同,由已成熟的韧皮部薄壁细胞围合而成;４） 臭柏的筛胞和韧皮纤维其长度明显较同亚科的圆柏和杜松的短