学习领域和教学组织与安排

目前,教育界人士对职业学校的专业课程各持己见。有人认为职业技术培训过于理论化岸生无法在课堂上学到足够的应用性知识。所以,提出一个以     

Joint rate control and scheduling for wireless uplink video streaming

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…     

舞动的心

“鲍勃!鲍勃!”我身旁的女人大声命令着,“告诉她你去年为什么不愿跟那个女人结婚!”桌子对面的鲍勃顺从地粗着嗓子回答：“哦,她呀!那真是糟透了!她对我说,要是想跟她结婚的话,我就再也不能去跳舞了!我就告诉她,‘噢,我想我做不到。’”     

英语习语的起源和文化内涵探究

习语的产生与存在受其特有的历史文化背景制约,所以研究英美习语要从历史的、文化的角度去分析。追根溯源,习语主要来源于宗教、神话传说、寓言故事、风俗习惯、历史事件、文学作品、名人轶事等方面,从中反映出英美文化的许多文化内涵。     

试论数学教育中的审美教育

在素质教育实施的今天,审美教育受到人们的广泛重视。数学知识中包含着许许多多美的因素,无论在公式、定理还是结论中,我们到处可以感受到数学的美,在数学教学中实施审美教育是完全可能的,而且内容是广泛的。在中学数学中加强数学审美教育,可以培养和发展学生的数学美感,使这形成对数学爱好,启发他们学习数学的最佳动机,促进创造思维的发展,以此促进数学教学质量的进一步提高。本文拟从以下三个方面来探讨这一问题：     

北太平洋巨型章鱼

北太平洋巨型章鱼是170余种巨型章鱼中的一种。人们曾经误把它们看成为海怪,实际上,它们性格平和,并不像古老传说描述的那样会攻击船只。     

The etiology of mathematical self-evaluation and mathematics achievement: understanding the relationship using a cross-lagged twin study from age 9 to 12

The genetic and environmental origins of individual differences in mathematical self-evaluation over time and its association with later mathematics achievement were investigated in a UK sample of 2138 twin pairs at ages 9 and 12. Self-evaluation indexed how good children think they are at mathematical activities and how much they like those activities. Mathematics achievement was assessed by teachers based on UK National Curriculum standards. At both ages self-evaluation was approximately 40% heritable, with the rest of the variance explained by non-shared environment. The results also suggested moderate reciprocal associations between self-evaluation and mathematics achievement across time, with earlier self-evaluation predicting later performance and earlier performance predicting later self-evaluation. These cross-lagged relationships were genetically rather than environmentally mediated.     

The comprehension and production of Wh-questions in deaf and hard-of-hearing children

Hearing loss during the critical period for language acquisition restricts spoken language input. This input limitation, in turn, may hamper syntactic development. This study examined the comprehension, production, and repetition of Wh-questions in deaf or hard-of-hearing (DHH) children. The participants were 11 orally trained Hebrew-speaking children aged 9.1-12.4 with moderate-to-profound hearing loss from birth, who consistently used hearing aids or cochlear implants and who had difficulties understanding relative clauses. Experiment 1 tested the comprehension of Wh-questions using a picture selection task, comparing subject with object questions and who- with which-questions; Experiment 2 tested the production of subject and object who-questions using an elicitation task; and Experiment 3 tested the repetition of Wh-questions and other structures derived by Wh-movement. All the DHH participants showed difficulty in the comprehension, production, and repetition of object questions, and their performance was significantly below that of hearing children. In contrast, they repeated embedded sentences without movement well, indicating that their deficit is in syntactic movement rather than embedding or the CP node in the syntactic tree. The results provide additional evidence that DHH children have difficulties with Wh-movement and emphasize that Wh-questions, which are crucial for communication, can be severely impaired in these children.     

Stability in Mother-Child Interactions from Infancy through Adolescence

OBJECTIVE: The current study examines homotypic stability in mother-child interactions, applying similar rating scales of mother-child interactions at 1 and 4.5 years, and heterotypic stability from 1 to 13 years and 4.5 to 13 years, using conceptually similar but not identical rating scales at age 13. DESIGN: We coded videotaped mother-child interactions in 202 families when children were 1, 4.5, and 13 years of age during age-appropriate and developmentally salient structured tasks for relationship quality. RESULTS: Multiple regression analyses controlled for the effects of child birth order and gender as well as maternal age and education. Maternal and dyadic, but not child, mother-child interaction qualities at 1 year significantly predicted similar or equivalent constructs at 4.5 and 13 years. Heterotypic stability from 1 to 13 years was partially or fully mediated by the same constructs at 4.5 years. CONCLUSIONS: Maternal behaviors showed a pattern of homotypic and heterotypic stability, whereas dyadic behaviors were somewhat less stable. Child behaviors showed evidence of both homotypic and heterotypic instability.