Statistical Distributions of Daily Breathing Rates for Narrow Age Groups of Infants and Children

Children may be more susceptible to toxicity from some environmental chemicals than adults. This susceptibility may occur during narrow age periods (windows), which can last from days to years depending on the toxicant. Breathing rates specific to narrow age periods are useful to assess inhalation dose during suspected windows of susceptibility. Because existing breathing rates used in risk assessment are typically for broad age ranges or are based on data not representative of the population, we derived daily breathing rates for narrow age ranges of children designed to be more representative of the current U.S. children's population. These rates were derived using the metabolic conversion method of Layton (1993) and energy intake data adjusted to represent the U.S. population from a relatively recent dietary survey (CSFII 1994–1996, 1998). We calculated conversion factors more specific to children than those previously used. Both nonnormalized (L/day) and normalized (L/kg-day) breathing rates were derived and found comparable to rates derived using energy estimates that are accurate for the individuals sampled but not representative of the population. Estimates of breathing rate variability within a population can be used with stochastic techniques to characterize the range of risk in the population from inhalation exposures. For each age and age-gender group, we present the mean, standard error of the mean, percentiles (50th, 90th, and 95th), geometric mean, standard deviation, 95th percentile, and best-fit parametric models of the breathing rate distributions. The standard errors characterize uncertainty in the parameter estimate, while the percentiles describe the combined interindividual and intra-individual variability of the sampled population. These breathing rates can be used for risk assessment of subchronic and chronic inhalation exposures of narrow age groups of children.     

晚清小说家眼中的立宪运动

晚清小说涉及宪政运动的大致可分为两类:一类是由立宪派所写,用来宣传立宪的内视角小说;另一类是小说家旁观品评的外视角小说.从晚清小说提供的视角中,我们可以看到立宪思想的传播和立宪的舆论准备,看到当时的普通人对立宪运动的看法,同时可以看到一个主义是否得到群众拥护,不在于其是否符合"历史规律",而在于其是否取得当时人的信任.     

诗词诗意意义的解释、构成与对诗词的完整把握

诗词意义可区分为词典意义的陈述和解释与诗意意义的解释与描述。论述诗词的诗意意义的构成方式 ,指出诗意意义的解释和描述比词典意义的陈述和解释更接近于对诗词本身的把握 ,但这种接近对古典诗词的把握来说 ,还隔着两层 ,即文字文本诗意经验层和声音文本诗意经验层。     

Consumption Patterns of Chinese Children

In the ten-year period from 1990 to 1999, children's consumption has increased dramatically in proportion to family income. In 85% of urban families, children's average consumption is equal to one third or more of the family's income. Resources are being directed to children's food and dietary supplements, toys, travel, computers and other electronic equipment, and educational resources. Children perceive that they have a significant influence on the family's financial decision-making. Problems related to children's consumption include indulgence in unnecessary or harmful purchases, and conspicuous consumption that cannot be sustained by the family's income. While some child-focused spending is viewed as enriching development, other expenditures may harm the family's economic well-being and foster an overly materialistic outlook among children.     

《二十四孝图》新解

《二十四孝图》是中国封建历史上孝子的典范故事,作为华夏民族的优良传统体现出中国独特的人文精神,我们需要为此发扬光大。但需要用马克思历史唯物主义的观点来重新审视这种历史沉淀物,使其更好的体现民族品格。     

中德成人教育的若干比较与认识

建国55年来,中国成人教育取得的成就令人瞩目.与继续教育十分成熟发达的联邦德国相比,我国成人教育与其有若干基本共同点,但在管理模式、教学组织与内容、从业人员结构及教育经费筹措等方面存在重要差别.加快我国成人教育的发展,必须调整现有成人教育结构,改革现行成人教育管理体制,完善终身教育体系,广泛运用现代网络技术,加强成人教育研究的咨询与信息统计交流.     

浅谈如何提高大学生英语阅读理解能力兼评《全新版大学英语快速阅读》

阅读理解能力是衡量一个人英语水平的重要因素之一,随着社会的发展和大学英语教学改革的大力推进,我们应当进一步加强对大学生阅读理解能力的培养,扩充他们对词汇量的掌握,并使他们了解相关的文化背景,从而达到提高阅读速度的目的。     

论翻译过程中的语境参与

语境是关系到翻译成败的最为重要的因素之一。它制约和影响着词汇的意义和语言手段的选择,限制和促成言语活动的效果的产生。语境在英译中的过程中是具有一些规律性的。     

英汉语内和语际理解障碍探讨

第二语言习得和理解的正确率取决于习得者对目的语的了解程度。在学习和使用第二语言时难免会出现这样那样的错误。有时是因为缺乏对目的语的了解而产生的语内差错,有时则是由于母语的干扰而出现的语际差错。对这些错误进行分类和分析,有助于习得者提高对第二语言的学习和应用能力,减少差错率。     

言语生成及理解的心理模型

言语生成 (speechproduction)和言语理解 (speechunderstanding)是语言交际中十分复杂的心理认知过程 ,也是心理语言学研究中的一个重要内容。本文拟对有关言语生成和理解的几种心理模型予以讨论 ,探讨言语生成及理解的过程和实质。