Promoting basic arithmetic competence in early school years–using a response to intervention model

This study investigated whether mathematics education based on a multi-tiered response to intervention (RTI) model can support students' arithmetic competence in primary schools in Sweden. The intent was to identify and support students at risk of failure. In this study, 113 students participated in the intervention, and 30 students participated in the control group. Both groups were followed from Grade 1 to the end of Grade 2 and compared. During the first semester in Grade 1, all students were taught basic addition and subtraction with explicit instructions in Tier 1. Those who did not respond to Tier 1 after one semester were provided support within Tier 2 during the second semester. The same was repeated in grade 2 and the students that did not respond to Tier 2 were supported within Tier 3. At the end of Grade 2, students in the intervention group performed significantly higher on the basic arithmetic competence in the number range 1–9 than the control group. No significant difference was found in a test measuring basic arithmetic competence in the number range 10–19. This study shows that using multi-tiered RTI might be sufficient to identify and support students at risk in early arithmetic competence.     

面向虚拟仿真环境的BH RTI性能测试研究

BH RTI是北京航空航天大学自主研发的分布交互仿真运行平台,该平台支持HLA 1.3和IEEE1516标准,是支持分布式交互仿真应用程序开发和应用程序高效运行的软件系统平台。在基于RTI的分布式仿真应用程序开发中,时间同步、网络延迟、吞吐量是RTI性能测试的主要指标,对BH RTI上述三个性能指标的测试方法进行了研究,设计了测试方案,通过编写相应的测试应用程序对BH RTI的时间同步、网络延迟、吞吐量等性能进行了测试。     

Looking at Literacy in the 21st Century

Literacy instruction has shifted in recent years alongside acts of legislation. Areas of literacy education like adolescent literacy and RTI are now receiving increased attention, whereas phonemic awareness, phonics, and fluency receive considerably less attention than 10 years ago. Comparative discussions describe “very hot” and “cold” topics as they relate to philosophy/approach, level, content, materials, and assessment in 2001 versus 2010. Educators can utilize this content information to inform their instruction and direct attention to needed areas within their own schools.     

Re-Discovering a Roman Wall Painting at Harvard: New Research on a Fragment from the Villa at Boscotrecase

ABSTRACT

This article presents historical and scientific analysis, as well as the conservation treatment of a newly rediscovered Roman wall painting fragment, now in the collection of the Harvard Art Museums. Although the piece has not previously been published, it was among a group of fragments removed from a Roman villa near Boscotrecase in southern Italy, an area that has been key to the study of Roman wall painting and other decoration. Technical imaging confirms the use of painting techniques consistent with other high-quality paintings in the area. Materials analysis revealed a palette consistent with published findings of Roman wall paintings, including abundant use of Egyptian blue and green earth. Of interest was the use of Egyptian blue as an optical brightener in select white passages. Despite the high quality of the painting, no cinnabar was present, and all red passages were achieved using hematite. Multiple different white minerals were identified including calcite, aragonite, and gypsum. The widespread presence of gypsum is unusual and may point to alteration.     

阅读困难诊断标准与模式的“后智力—成就差异”趋势

阅读困难是学习困难研究中最受关注的一个领域,对整个学习困难研究领域具有重要影响。对阅读困难的有效诊断是阅读困难的研究和干预的基础。在阅读困难的诊断中,曾经广泛应用的智力—成就差异标准与模式在有效性、敏感性以及对干预的指导意义等方面存在严重不足,受到越来越多研究者和实践者的屏弃。目前,核心技能缺陷和干预—应答两类诊断标准和模式日益受到关注和采纳。我国迄今较少系统研究阅读困难的诊断标准与模式,不过,有关汉语阅读困难的初步研究鉴别出语音缺陷、快速命名缺陷和语素技能缺陷,为发展和应用核心技能标准和模式提供了重要基础,也为建立干预—应答模式提供了参考。确立汉语阅读困难诊断的核心技能与干预—应答标准与模式还有待系统和深入的研究。     

Using response to kindergarten and first grade intervention to identify children at-risk for long-term reading difficulties

Entry-level kindergartners in classrooms from five middle class school districts were given a test of letter identification and children who scored at or below the 30th percentile on the test were classified as “at risk” for early reading difficulties. Half of these children were randomly assigned to a project-based intervention condition where they received supplementary intervention in small groups until the end of their kindergarten year. The other half received whatever remedial services were available at their home schools and literacy skills development in both groups was tracked throughout kindergarten. All available at-risk children were again assessed at the beginning of first grade and dichotomized into a “continued-risk” group and a “no-longer-at-risk” group using a composite measure of basic word level skills. Normal reader controls were also identified using the same measure. Children in the continued-risk group received either project-based intervention (one-to-one tutoring 30 min daily) or school-based intervention throughout first grade. Intervention for project treatment children was discontinued at the end of first grade and literacy development in all groups was tracked until the end of third grade. The present study focused on literacy development in children who received only project-based kindergarten intervention or both (project-based) kindergarten and first grade intervention, relative to the normal reader controls. Of special interest was the question of whether measures of response to intervention would more effectively distinguish between continued-risk and no-longer-at-risk children than would kindergarten screening measures, measures of intelligence, or measures of reading-related cognitive abilities. Results indicated that the RTI measures more effectively and more consistently distinguished between these two groups than did the psychometric measures.

Testing the Immediate and Long-Term Efficacy of a Tier 2 Kindergarten Mathematics Intervention

ABSTRACT

This study examined the efficacy of a kindergarten mathematics intervention program, ROOTS, focused on developing whole-number understanding in the areas of counting and cardinality and operations and algebraic thinking for students at risk in mathematics. The study utilized a randomized block design with students within classrooms randomly assigned to treatment or control conditions. Measures of mathematics achievement were collected in the fall (pretest) and spring (posttest) in kindergarten and in the winter of first grade (delayed posttest). Significant differences between conditions favoring treatment students were found on four of six measures at posttest. Treatment students reduced the achievement gap with their not-at-risk peers. No effect was found on follow-up first-grade achievement scores. Implications for Tier 2 mathematics instruction in a Response to Intervention model are discussed.     

压力信号调理电路探讨

以300kN抗压强度试验机信号调理电路为基础,探讨在压力信号调理电路设计过程中容易忽视或片面理解的电源解耦、失调电压漂移因素、RFI片内整流误差等五个问题,并提出相应对策.     

美国特殊儿童学业困难反应模式——RTI模式

全纳教育的发展凸显了各国在响应所有特殊儿童的特殊教育需要上存在的问题。美国采用RTI模式为学业上存在困难的学生提供支持和服务。RTI模式的提出基于美国国内教育的现状和理论、实践上的研究成果,其三级干预模式能对有特殊教育需要的儿童做出迅速、有效的反应。RTI模式作为一种新的特殊儿童学业困难反应模式,因其自身特点而比以往模式更具优势,但也存在一些问题。     

Evaluation of the relief line and the contour line on Greek red-figure vases using reflectance transformation imaging and three-dimensional laser scanning confocal microscopy

Abstract

The relief and contour lines on a group of ancient Greek red-figure vases and vase fragments in the collection of the Harvard Art Museums and the Worcester Art Museum were examined using two surface examination methods – reflectance transformation imaging and three-dimensional laser scanning confocal microscopy. These methods helped characterize the lines and answer questions regarding tools, techniques, and production sequence used by Greek vase painters. This research also incorporated fabricated mock-ups to gain a better understanding of the ancient technology and in so doing confirmed that the relief lines were not produced by an extruded method, but with a brush made with only a few hairs, termed linierhaar as first proposed by Gérard Seiterle in 1976. Furthermore, it was discovered that not one but two distinct types of relief lines exist on these ancient vases: the laid line (proposed by Seiterle) which has a characteristic ridged profile, and the pulled line (proposed in a previous publication by the authors) which has a furrowed profile. It was also determined that the relief line used to outline figures was applied prior to the contour line in Attic vase decoration, although variations in this sequence occur in vases from South Italy. Based on observations made during this research, the authors propose a likely evolution for the techniques used to produce decorative features throughout the period of red-figure vase production.