基于光电二极管的动脉血压信号无损监测技术

用红外发光二极管和光电二极管组成的光耦合指套,放置在人身体的指尖部位,通过检测人体末梢组织在动脉舒张和收缩时对红外光的吸收度变化率,来检测人体动脉血压信号的异常.红外发射二极管的驱动采用PWM信号调制的恒流驱动,光电二极管接收穿透人体后的红外光并转换成微弱的电信号,再经过前置放大、倒相、压控二阶低通滤波、陷波电路、A/D转换等处理后,MCU从采集的数据中提取有关动脉血压信号的特征值,实现血压信号异常的无损连续监测.     

竞技健美操有氧舞蹈项目第二风格动作编排特征研究

第二风格动作是有氧舞蹈区别于其他竞技健美操项目显著的构成要素,运用文献资料法、录像观察法、数理统计法对第13届健美操世锦赛有氧舞蹈项目决赛8支队伍第二风格动作编排进行研究,结果显示编排特征为:目前第二风格动作出现位置在成套动作的中1/3比较合理;第二风格动作可选择的舞蹈风格广泛,应大胆尝试;内容中多融入大幅度动作和复杂多变的配合,技术技巧和托举动作不适合出现;音乐节奏感强,注重与成套音乐的衔接和配合及音乐风格的吻合或呼应。     

浅论成人在二语习得中的母语负迁移现象

母语迁移对二语或外语学习的影响历来是语言学家们研究的重点,也是引起争论的焦点之一。我国成人在学习二语时经常出现的错误大都源于母语的负迁移作用。拟从语音、词汇、句法、语用等四个层面出发,以英语学习为例,通过比照汉语和英语的不同语言特性,分析由此引起的母语对成人二语习得过程中的负迁移作用,并提出相应的策略以促进第二语言的学习。     

基于UG的汽车钣金模具二次开发设计及有限元分析

从新的理论研究视角——复杂适应系统理论着手,针对企业零件的复杂性与单一性,利用TRIZ原理,对汽车某些部件进行有限元分析,找出其重要环节,进行工序的整合,编制出适合企业自身发展需要进行设计时的个性化工具条,以提高工作效率,实现自动化出模。     

山西省高校俄语二外教学面临的困境与出路

随着全国高校普遍性的开设英语专业,对作为英语专业必修课的第二外语课程的研究也日渐得到重视。联系山西省各大高校俄语二外开展情况,总结分析了我省高校俄语二外教学面临的三方面问题和困难,提出了自己在教学实践中已经验证了的、行之有效的措施和建议,以期对我省高校的俄语二外教学提供好的借鉴和帮助。     

法语代词soi的教学新探

"soi"是法语重读人称代词中的一个特殊存在。它既属于泛指代词,但是又能指代到群体中的个体。对于学过英语的法语初学者来说,这个单词既在英语里找不到完全相同的单词,又和英语的个别代词的个例对应,使得学生在学习这个词语的具体使用情况时感到陌生和难以掌握。针对在教学中学生对其理解的障碍,探讨如何根据认知语言学的理论指引,在课堂上既避免学生英法混淆,又能清楚记住"soi"的特点。     

Supporting English second-language learners in disadvantaged contexts: learning approaches that promote success in mathematics

In the Australian context, children living in disadvantaged circumstances, whose second language is English, are one of the groups at risk of failing in mathematics. This paper explores the impact purposely developed learning activities (Representations, Oral Language and Engagement in Mathematics Learning activities) have on pupils' mathematics outcomes in the first three years of formal schooling (Foundation, Year 1 and Year 2). The participating group (n = 461) comprised 328 English language learners and 133 mainstream pupils. To ascertain the impact of the learning experience, pre- and post-tests were conducted at the commencement and completion of each school year. The results indicate that all of the children significantly improved, with English as a second language pupils showing the greatest gains, and achieving norm-referenced expectations for their age.     

The effect of peer group performance on the self-concept of reading in a foreign language

According to the big-fish-little-pond (BFLP) model, the self-concept is not only influenced in a positive way by one’s own achievement, but also in a negative way by one’s relative achievement in comparison with one’s immediate peers. This study investigates whether the BFLP effect also holds for second language acquisition. A random sample of 9167 Dutch-speaking students from Grade 8 took a reading comprehension test in French followed by a short background questionnaire in which they were asked for their self-concept of reading French. Multilevel regressions of the latter on individual and group achievement confirmed the BFLP effect but did not confirm an interaction of the effect with gender, individual achievement or class size. Moreover, in line with the local dominance hypothesis, it was shown that the negative effect of the average performance of peers is stronger for classmates than for schoolmates.     

第二语言口语非流利产出研究述评

言语非流利是指在速率、韵律、词语序列上有标记的部分,包括各种非流利停顿、重复、填充语和自我修正。在二语习得中,大多数非流利现象都反映了言语计划压力,是二语水平欠佳的表现。近期研究发现,非流利现象并不都是由于言语困难所致,它还有可能是一种互动策略,以达到引人注意或引起听众的回应为目的。语法学家运用现有句法理论,甚至增加新的句法规则将非流利纳入语法可以解释的范围。语音学家认为话语的声学特征和音韵信息在非流利的检测和处理中起着重要作用。社会语言学家发现男性和女性、不同年龄的学习者在非流利出现的类别和频率上存在差异。语用学视角将非流利现象看成一种语用策略,涉及说话人和听话人双方的互动。对二语学习者来说,非流利的语用视角对其二语语用能力的发展有着积极意义。     

Motivation in Second Language Acquisition

Second language acquisition is a complex process which involves various factors. The factors can be put into two cate?gories:social factors and learner factors. Each category includes a number of facto...