The effect of the planet’s number on dynamic characteristics of planetary gear systems

Considering the effect of planet’s number on the dynamic characteristics of the planetary gear system, a translation-torsion lumped-parameter model of 2K-H spur planetary gear system was established. Through the analysis of numerical solution, the results show that 1) When the planet’s number is more than 3, the order of the natural frequency will become the same; 2) When the planet’s number increases, the natural frequencies of planet mode remain invariant, but when it comes to rotational mode and translational mode, the higher order natural frequencies increase and the lower order natural frequencies decrease; 3) The planet’s number has a great impact on the higher order natural frequencies and a little impact on the lower order natural frequencies; and 4) To avoid the resonance, we can appropriately increase or decrease the number of the planet.     

Children’s writing of argumentative texts: Effects of indirect instruction

This study reports on grade 4 children’s (Ss) knowledge of constraints and characteristics of persuasive written requests (RQ).

1. All Ss wrote a first RQ asking money to improve their computer lab.
2. Experimental (E) and control (C) Ss evaluated 4 different RQ.
3. selected and ordered, out of 30 scrambled sentences, those appropriate for a “good” RQ.
4. A week later, E Ss had a collective “training discussion” on requests.
5. A week later, E and C Ss wrote a second RQ asking money for their science lab.

Results pertaining to different aspects of the produced RQ showed that the training did have some effects but both groups improved in their II RQ. The results were interpreted as suggesting that both groups actually learned what an appropriate request is by carefully evaluating the 4 requests and by constructing a request from a sentence list.     

The effect of computer‐based multimedia instruction with Chinese character recognition

The purpose of this study was to examine second language learners’ learning achievement and attitudes toward two different types of dual coding designs (text group: image plus on‐screen text versus narration group: image plus narration) in Chinese character acquisition. A total of 66 college students who did not have prior knowledge of the Chinese language were randomly assigned to either the text group or narration group. The findings showed that there was no interaction between the treatments (text group versus narration group) and test occasions (immediate and delayed post‐tests), and there was no significant difference between two groups in the immediate post‐test and in the delayed post‐test. However, there was a significant difference between the test occasions. Furthermore, the results revealed that there was no significant difference between two groups in both the tutorial design factor and the cognitive load factor. Overall, participants in both groups achieved high scores in the post‐tests and showed positive attitudes toward the dual coding tutorials.     

The Effects of Play Tutoring on Young Children’s Cognitive Performance

Abstract

Seventeen preschoolers were divided into a play tutoring group and a skills tutoring group. Subjects in the first group received nine 20-minute sessions in which an adult attempted to enhance their make-believe play. The other group received an equal number of skills tutoring sessions. Both groups received a comparable amount of adult contact. The subjects were assessed on measures of play quality, verbal intelligence, and creativity , on three occasions: prior to training, immediately after training, and three months later. Results showed that the play tutoring and skills tutoring treatments both resulted in stable gains in verbal intelligence and ideational fluency. Neither treatment resulted in significant increases in play quality. It was concluded that the play tutoring gains were caused by adult contact rather than by enhanced levels of play.     

The effect of standardized test information on teachers’ assessment of ability in their classes

Abstract

The responses of three groups of teachers to a rating task in which they were asked to indicate how many of their pupils were “bright”, “above average”, “below average” and “dull” were compared. In two of the groups, teachers had been provided with test information based on performance on nationally standardized ability and attainment tests. In the third group tests had been administered but no results were provided.

No differences between the groups were found in terms of the extent to which teacher ratings of ability levels correspond with mean ability test scores. In addition, teachers, irrespective of the group to which they belonged, were found to display a tendency to place more pupils in the above average categories than the below average categories. Finally, no support was found for an hypothesis which suggested that test information would differentially affect the ratings of teachers of classes with pupils who were typical and untypical with respect to age.

The fact that the correlation between mean ratings and mean test scores were found to be fairly high in all three groups (they ranged from .51 to .60) suggests a reason for the failure of test information to impact on teachers’ judgements. The degree of agreement between teachers and tests that the correlations reveal means that there is less scope for a convergence of ratings on tests to occur than might otherwise be the case.     

The effect of randomly assigned advisor’s department on student outcomes

Mentors have the potential to influence important academic and career outcomes. I examine the impact of one type of mentor – academic advisors – on student outcomes at the United States Air Force Academy. Exploiting the random assignment of advisors to first-year students, I find that these mentors influence students in different ways. Male and nonwhite students earn higher grades in courses in their advisors’ academic department, providing evidence that they are more likely to study and/or seek extra help because of their advisor. Advisor’s department is not associated with improved grades for female students; however, they are more likely to declare a major in their advisor’s department. I believe this provides unique evidence on the influence of academic advisors at academic institutions.     

The Effect of Teacher Attitudes on Children’s Responses to Defective Articulation

Abstract

A group of 040 first-grade children reacted to four criterion attitude" "elected to reflect different way" teacher" may respond verbally toward a child with defective speech. They answered four questions indicating their acceptability of him. The purpose of the Investigation was to study the effect of the teacher attitudes on the children's responses. Results Indicate a significant relationship" and support the assumption that the social acceptability of speech-defective school children Is related to teacher attitudes. These children are chosen more often by their peers when the basis for selection Is friendship rather than speaking ability.     

The Implication of Gagne’s Five Categories of Learning on Designing English Teaching Objectives

Robert Mills Gagne’s five categories of learning have a profound influence on the many aspects of educational field.This essay attempts to differentiate and analyze the five categories of learning:motor skills,verbal information,intellectual skills,cognitive strategies,and attitudes.And then applies Gagne’s five categories of learning to design English teaching objectives.     

The effect of high-stakes examination systems on teacher beliefs: Egyptian teachers’ conceptions of assessment

Egypt is currently attempting to introduce a greater formative use of assessment while maintaining a public examination system. This study investigates teacher beliefs about the purposes of assessment in Egypt, using the Teachers’ Conceptions of Assessment (TCoA) inventory. The TCoA inventory elicits responses about four main factors: Improvement, School Accountability, Student Accountability and Irrelevance. A large sample of (n?=?507) Egyptian pre-service and in-service teachers completed an Arabic version of the TCoA inventory. Confirmatory factor analysis was used to test the Egyptian teachers’ responses against the pre-existing New Zealand model, which was found to be inadmissible. Consequently, an ecologically rational three-factor model was found. The model yielded a strong positive relationship between Improvement and Student Accountability, consistent with previous studies. It is argued that greater changes to the examination system are required if teacher beliefs are expected to be more positive about the priority of formative, improvement-oriented uses of assessment.     

The effect of dialect experience on Chinese children’s Mandarin phonological awareness

Most studies on bilingual phonological awareness suggested that children who were able to speak a second language performed better in phonological awareness tasks; some studies however found different results. This study revisited the issue by investigating the effect of Min dialect experience on Chinese children’s Mandarin phonological awareness. Children who were able to speak Mandarin only (M) were compared with children who were able to speak one dialect and Mandarin (DM) or two dialects and Mandarin (BiDM). In Experiment 1, 2nd and 4th grade M children performed better than their Minnan DM and Puxian DM counterparts in onset and rime judgement. Experiment 2 detected also an advantage of 1st and 2nd grade M children over their Mindong DM peers in syllable deletion and rime oddity. In Experiment 3, M children performed significantly better than their Mindong DM and Mindong–Puxian BiDM peers in 1st and 2nd grade and the difference remained significant between M children and BiDM children when IQ was controlled. The M advantage disappeared however in higher grades in all experiments. Generally the results suggested that Min dialect experience interfered with children’s performance in Mandarin phonological awareness, but the disadvantage disappeared as children proceeded to higher grades. The interference was discussed as consequence of subtractive bilingualism and Mandarin as cognitive tool.     

Young Children’s Mathematical Learning From Intelligent Characters

Children’s math learning (N = 217; M_age = 4.87 years; 63% European American, 96% college-educated families) from an intelligent character game was examined via social meaningfulness (parasocial relationships [PSRs]) and social contingency (parasocial interactions, e.g., math talk). In three studies (data collected in the DC area: 12/2015–10/2017), children’s parasocial relationships and math talk with the intelligent character predicted quicker, more accurate math responses during virtual game play. Children performed better on a math transfer task with physical objects when exposed to an embodied character (Study 2), and when the character used socially contingent replies, which was mediated by math talk (Study 3). Results suggest that children’s parasocial relationships and parasocial interactions with intelligent characters provide new frontiers for 21st century learning.     

Data-based differentiated instruction: The impact of standardized assessment and aligned teaching material on students’ reading comprehension

The paper analyzes the efficacy of a data-based differentiated instruction (DBDI) intervention in addressing growing achievement-related heterogeneity in school. The intervention consisted of a reading strategy training conducted by teachers, in which 27 secondary-school classes (n_students = 656) participated. The propensity-matched control group consisted of another 27 classes (n_students = 558). Linear mixed models showed that students of the intervention classes had no greater gain in reading competence on average compared to students of the control classes. However, the groups differed regarding the learning gain at different achievement levels. In the control group, the gain was greatest for the low achievers and lowest for the high achievers. This imbalance was not found in the intervention group, where the learning gain was similar for students of each achievement level. This shows that DBDI is a tool for addressing achievement-related heterogeneity which empowers teachers to cater to the differences between students.     

The Development of Children’s Concept of a Substance: A Longitudinal Study of Interaction Between Curriculum and Learning

This paper is a reflection on a three-year longitudinal study that explored the development of children’s concept of a substance, for which detailed results concerning children’s understandings have been reported elsewhere. The attention in this paper is on the methodological features related to the longitudinal nature of the study and the insights into pupils’ learning that were afforded by its design. There is, of course, an extensive literature on children’s understandings of scientific ideas, and the nature of conceptual change involved in learning is a contested area. I argue in the paper that longitudinal studies are uniquely placed to inform the debate, and by focusing on this particular study the aim is to demonstrate the kind of contribution that can be made.     

Book matters: The effect of Cocky’s Reading Express on student performance

The literature argues that children are more likely to succeed academically if they acquire strong reading skills and a love of reading at a young age. In this paper, I evaluate an early childhood literacy program, Cocky’s Reading Express (CRE), to understand how reading events at school and the gifts of books impact learning. Combining the CRE visit records with administrative student data, I find that CRE leads to 0.02–0.03 of a standard deviation increase in statewide English Language Arts test scores among low-income students one year after the visit and find suggestive evidence that CRE improves the math scores for subgroups of students in poverty. In particular, the CRE effect varies based on locality and access to reading materials, with a larger effect on students residing in metropolitan areas or close to public libraries. However, the positive effects on low-income students diminish over time; CRE does not show impacts on the scores of students from better-off families either.     

Pakistani Teachers’ Perceptions of Kindergarten Children’s Learning: An Exploration of Understanding and Practice

This paper considers perceptions of children’s learning and classroom practice to support learning in the Pakistani early years educational context. In Pakistan, there is a growing focus on quality provision of early childhood education and building early childhood education teacher capacity. Over the course of one academic year, data were collected from kindergarten teachers in a Pakistani urban school through interviews and classroom observations as part of a larger study. Findings presented in this paper are based on the interview data of two teachers in the sample, a novice and an experienced teacher. Data analysis examined their perceptions of kindergarten children’s learning and of their practice to support kindergarten children’s learning, taking into consideration the gender perspective. The results showed tensions in the teachers’ perceptions which contrasted between a constructivist approach and a teacher-directed skills approach. Perceptions of their practice reflected a formal, teacher-directed approach rather than a constructivist approach and a teacher-directed skills approach to teaching. Several factors, including deep-rooted perceptions as well as curriculum structure, time, number of staff and resources, contributed to this.