Functional methods for time series prediction: a nonparametric approach

The problem of prediction in time series using nonparametric functional techniques is considered. An extension of the local linear method to regression with functional explanatory variable is proposed. This forecasting method is compared with the functional Nadaraya–Watson method and with finite‐dimensional nonparametric predictors for several real‐time series. Prediction intervals based on the bootstrap and conditional distribution estimation for those nonparametric methods are also compared. Copyright © 2010 John Wiley & Sons, Ltd.     

温度和应变率对拉伸载荷下记忆合金本构关系的影响

用于高温Split Hopkinson Bar(SHB)试验的新型快速加热电炉，可在1min左右将试件加热至500度，最高可加热至1000度，且金属材料和非金属材料均可加热，在20－800度和0．00208－350s^-1范围内研究了温度和变率对拉伸载荷下铁基形状记忆合金本构关系的影响，结果表明，随着应变率提高，材料强度提高，延伸率降低，材料强度，延伸率及应变率敏感性随温度升高而降低。     

工程制图试题库应用系统的开发

讨论了一个工程制图试题库管理软件系统的组成，基本功能及其开发方法，得出了几个同类软件开发中解决难点问题的结论．     

Composition and abundance of periphyton and aquatic insects in Sierra Nevada, California, stream

The species composition of periphyton and benthic insect communities and abundances of common taxa (&;gt;0.1&;#37; of individuals) were examined during snow-free months in Convict Creek, a permanent snowmelt- and spring-fed stream in the Sierra Nevada of California. The communities were highly diverse. The most abundant taxa in the periphyton were diatoms ( Achnanthes minutissima, Cocconeis placentula lineata, Cymbella microcephala, C. sinuata, Fragilaria construens, F. crotonensis , Navicula spp., Synedra acus , and S. rumpens ), except in late spring and summer when several seasonal blue-green algae ( Chamaesiphon incrustans, Lyngbya spp. and Oscillatoria spp.) are at their maximum densities. Most common periphyton taxa vary systematically in abundance with season, but relative abundances of taxa also appear to be influenced by streambed scouring and by concentrations of ambient nutrients. Data on population densities and length frequencies of larval and nymphal stages of common benthic insects and occurrences of pupal and adult stages were examined to determine life history patterns. Taxa hatching in winter and spring and abundant as immatures in late spring include ephemeropterans ( Epeorus longimanus, Drunella flavilinea , and Caudatella heterocaudata ), plecopterans ( Calineuria californica, Doroneuria baumanni, and Pteronarcys princeps ) and dipterans ( Cryptolabis sp.). Common taxa hatching in late spring or summer are the plecopteran Malenka ( californica? ) and the trichopterans Arctopsyche grandis and Rhyacophila acropedes . Several bivoltine and multivoltine ephemeropterans ( Baetis devinctus and B. tricaudatus ) and dipterans ( Simulium spp. and Chironomidae) have summer cohorts. Taxa hatching in late summer or autumn and most abundant in autumn include ephemeropterans ( Baetis spp., Ephemerella infrequens, Epeorus dulciana, Ironodes lepidus , and Paraleptophlebia pallipes ), trichopterans ( Hydropsyche oslari, Lepidostoma spp., Glossosoma califica, Micrasema sp., Brachycentrus americanus, Neophylax sp., and Rhyacophila vaccua ) and dipterans ( Antocha monticola, Pericoma sp., and Chironomidae). Major recurring events that may influence life history patterns and structure of the benthic insect community are (1) near-freezing, nighttime winter water temperatures and occasional anchor ice, (2) a prolonged period of high discharge in late spring and early summer (3) a brief summer, and (4) a prolonged period of moderate stream discharge in autumn when the substratum is stable and food is abundant.     

用稻壳、稻草制取水玻璃过程中金属杂质的去除及其机理分析

对用稻壳、稻草制备水玻璃所剩余的炭渣进行了分析，给出实验结果．结果表明：金属成分在水玻璃的制备过程中以难溶化合物的形式被除去；难溶化合物能与酸反应，转化为可溶化合物；新技术制取的水玻璃溶液与传统方法相比，纯度相同，甚至更高．     

人民币汇率走势探析

主要分析了人民币汇率近几年的走势及其成因，阐述了人民币不贬值的意义，论述了人民币今后的走势及其主要依据．     

基于三参数区间数的灰色模糊综合评判

综合灰色数学和模糊数学的优点,提出使用三参数区间数来表示灰色模糊数,并将其应用到综合评判问题中,给出了相应的灰色模糊综合评判的方法和步骤.最后讨论了三参数区间数的排序方法.该方法适合于解决工程实际中同时具有灰色性和模糊性的评判问题,所举算例也证明了这一点.     

Hemoglobin causes both endothelium-dependent and endothelium-independent contraction of the pig coronary arteries, independently of an inhibition of EDRF effects

Hemoglobin is widely used as an inhibitor of EDRF effects. Hemoglobin contracts pig coronary arteries in vitro. However, during this contraction, effects of substance P and bradykinin which act via the EDRF are not inhibited. This means that the hemoglobin contraction is not caused by inhibition of the EDRF. This contraction is caused by a substance released from the endothelium, and by eicosano?ds released from the smooth muscles.