国内外羊毛西装面料加工性能的比较

选择35种国内外羊毛西装面料,利用FAST仪对其加工性能进行测试,运用主成分分析方法对其差距与缝纫质量进行比较.结果表明,国内外毛西装面料的主要差异是可成型性,其他依次为湿膨胀性、厚重性、松驰回缩性等.这些差距表明国外毛西装面料加工时制作难度小,尺寸稳定性好,缝纫缩皱较轻,而国内面料制作难度大,缝纫缩皱严重.     

财政政策背景下的家庭教育投资行为分析

概述了国内外对公共教育投资和家庭教育投资的研究,选择新古典经济学中的家长最优化框架来构建家庭教育投资的一般模型.在此基础上,引入了3类公共教育财政政策,即强制供给、收入补贴和专项补贴.重点考察了在这3类教育财政背景下家庭教育投资的行为,并对一般模型和这3类模型的结论做了进一步的比较分析,为教育财政政策的制定提供了一些可行建议.     

A positive-temperature-coefficient electrode with thermal protection mechanism for rechargeable lithium batteries

A new positive-temperature-coefficient(PTC) material was prepared simply by blending of conductive Super P carbon black(CB) with insulating poly(methyl methacrylate)(PMMA) polymer matrix,which was empolyed as a coating layer on the aluminium foil substrate to fabricate a sandwiched Al/PTC/LiCoO2 cathode.The experimental results from cyclic voltammetry,charge-discharge measurements and impedance spectroscopy demonstrated that the PTC electrode has a normal electrochemical performance at ambient temperature,but shows an enormous increase in the resistance at the temperature range of 80?120℃.This PTC behavior greatly restrains the reaction current passing through the electrode at elevated temperatures,capable of acting as a self-actuating safety mechanism to prevent the battery from thermal runaway.     

基于数字滤波ZPW-2000R接收机交流阻抗检测

针对ZPW-2000R型移频自动闭塞系统接收机生产中的质量测试,介绍了系统对于关键测试项目—接收机交流输入阻抗的测试过程与方法.系统采用高速DSP芯片TMS320F2812作为主控芯片,由AD9833信号发生器模块产生相应测试信号,由F2812内部AD采集待测信号,通过校正算法和数字滤波器进行交流数据处理.通过分压原理间接测得接收机的交流输入阻抗.经实验验证,系统测量交流输入阻抗时效率高、测量结果准确,具有较高的实用价值和推广意义.     

Biosorption and biodegradation of polycyclic aromatic hydrocarbons by Phanerochaete chrysosporium in aqueous solution

Biosorption and biodegradation of phenanthrene and pyrene by live and heat-killed Phanerochaete chrysosporium are investigated to elucidate the bio-dissipation mechanisms of polycyclic aromatic hydrocarbons(PAHs) in aqueous solution and its regulating factors.The effects of nutrient conditions(carbon source and nitrogen source concentrations),the co-existing Cu 2+,and repeated-batch feed of PAHs on the biosorption and biodegradation are systematically studied.The removal of PAHs by dead bodies of P.chrysosporium is attributed to biosorption only,and the respective partition coefficients of phenanthrene and pyrene are 4040 and 17500 L/kg.Both biosorption and biodegradation contribute to the dissipation of PAHs by live P.chrysosporium in water.After a 3-d incubation,the removal percentage via biosorption are 19.71% and 52.21% for phenanthrene and pyrene,respectively.With the increase of the incubation time(3 40 d),biodegradation gradually increases from 20.40% to 60.62% for phenanthrene,and from 15.55% to 49.21% for pyrene.Correspondingly,the stored-PAHs in the fungal bodies decrease.Under the carbon-rich and nitrogen-limit nutrient conditions,the removal efficiency and biodegradation of phenanthrene and pyrene are significantly promoted,i.e.99.55% and 92.77% for phenanthrene,and 99.47% and 83.97% for pyrene after a 60-d incubation.This phenomenon is ascribed to enhanced-biosorption due to the increase of fungal biomass under carbon-rich condition,and to stimulated-biodegradation under nitrogen-limit condition.For the repeated-batch feed of phenanthrene,the pollutant is continuously removed by live P.chrysosporium,and the contribution of biodegradation is enhanced with the repeated cycles.After 3 cycles,the biodegradation percentage is up to 90% with each cycle of a 6-d incubation.     

Testing for the usefulness of forecasts

Ashley (Journal of Forecasting 1983; 2 (3): 211–223) proposes a criterion (known as Ashley's index) to judge whether the external macroeconomic variables are well forecast to serve as explanatory variables in forecasting models, which is crucial for policy makers. In this article, we try to extend Ashley's work by providing three testing procedures, including a ratio‐based test, a difference‐based test, and the Bayesian approach. The Bayesian approach has the advantage of allowing the flexibility of adapting all possible information content within a decision‐making environment such as the change of variable's definition due to the evolving system of national accounts. We demonstrate the proposed methods by applying six macroeconomic forecasts in the Survey of Professional Forecasters. Researchers or practitioners can thus formally test whether the external information is helpful. Copyright © 2010 John Wiley & Sons, Ltd.     

插图影响高中生阅读的研究——来自眼动的证据

阅读对人们的正常生活发挥着重要的作用,对高中生更是如此。在学习中,阅读代表着知识的获得。阅读是一种复杂的、主动思维的过程,是根据已有知识和经验对文本信息进行筛选、验证、加工和组合的思维过程,眼动记录可以解释这一复杂过程的诸多细节信息。本研究使用德国SMI公司生产的Hi-speed眼动仪,采用2(配图:有/无)×2(难度:难/易)的双因素混合设计,对28名高中生在阅读有无配图且难易不同的中文材料过程中的阅读理解指标和眼动指标进行考察。结论:在阅读难的程序性材料时,插图有助于阅读的理解;在简单程序性材料中,配置插图是不必要的。     

电视机故障检修的计算机仿真系统

传统的电视机实验存在着效率低,损耗大,效果差等难以克服的弊端。利用计算机软件制作电视机故障检修的仿真系统,作为辅助手段,能够很好地解决以上问题,大大提高电视机故障检修实验教学的质量。     

美国重返亚洲战略下的中国对外政策调整

当前,全球经济复苏问题凸显,亚洲作为世界经济新的引擎,出现整体性复兴的迹象。在新的国际局势下,积极寻找经济复苏途径、重塑美国领导形象的奥巴马政府与以和平发展为目标的复兴中的最大发展中国家中国的关系,就不仅仅是中美的双边关系,或是亚太区域的国家关系,而是涉及到全球政治战略、经济秩序、安全生态的大国关系。奥巴马上任不久,就提出美国会提高对亚太区域的关注,随后,美国重返亚洲成为国际社会热议的话题。     

Biomimetic fluorapatite films for conservation of historic calcareous stones

Fluorapatite protective films were prepared on marble substrates using a biomimetic method. By mimicking the mineralization mechanism of enamel, phosphorus and fluorine were introduced on the surface of the marble substrate. In the presence of a biological template, namely collagen, an integrated fluorapatite film was produced and the marble substrate was entirely covered. The prepared fluorapatite films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive X-ray (EDX) spectroscopy. The performances of the fluorapatite films were evaluated by color changes, capillary water absorption, and acid resistance tests. The results revealed that the fluorapatite films had good compatibility with the marble substrate; the physical properties such as color and capillary water adsorption of the marble substrates were unchanged. The fluorapatite films also had good acid resistance and were stable even in heavy acid rain.