关于单一简单问题的学生团体反应时间分布参数估计与运用

介绍在计算机局域网环境条件下进行单一简单问题测试,收集学生团体的反应时间分布数据并加以处理的基本方法,给出时间反应分布参数的矩估计结果,初步探讨学生团体反应信息的有效运用问题。     

Cooperative Learning and the Organization of Secondary Schools

This article describes the inter‐relationship between school organization and classroom instructional style. Two distinct models of school organization, the bureaucratic and open‐systems models, are characterized in terms of three major dimensions of school life; a. the behavior of administrators, teachers and students, b. work design and tasks, and c. space‐time allocations. It is shown that the bureaucratic model of school organization parallels, and sustains, the traditional whole‐class method of teaching in all of the three dimensions. An open‐systems model of staff organization at the school level is required to sustain an alternative form of classroom instruction such as cooperative learning. The approach presented here emphasizes the inter‐relatedness of all three dimensions of schooling at the organizational and classroom levels. It also claims that the implementation of genuine instructional change, that entails new patterns of interpersonal relations in the classroom, is contingent upon similar changes being made at the level of the school as an organization. Lack of attention to school organizational change may explain why efforts at changing instruction at the classroom level frequently fail to yield results.     

Racism and citizenship education in Northern Ireland

Racist attitudes towards, and attacks on, the minority ethnic populations in Northern Ireland (NI) have increased dramatically over the last number of years. Despite the increased media attention regarding racist attacks, the fallacy that racism is not a major problem in NI is an enduring one. However, there is a growing recognition that minority ethnic communities experience a diverse range of racial harassment. Education is a mode promoted by national and European governments as the vehicle in which anti-racism programmes can be delivered. This article suggests the impending introduction of a statutory citizenship education (CE) component to the revised NI curriculum from September 2007 can play an important role in tackling the high levels of racism being experienced by the minority ethnic population in NI.     

Scaling-up Sustainable Land Management Practices through the Concept of the Rural Resource Centre: Reconciling Farmers' Interests with Research Agendas

Abstract

Purpose: Formal agricultural research has generated vast amount of knowledge and fundamental insights on land management, but their low adoption has been attributed to the use of public extension approach. This research aims to address whether and how full participation of farmers through the concept of Rural Resource Centre (RRC) provides new insights for the development of alternative and farmers-based extension methods.

Design/Methodology/Approach: Using the Concept of RRC, this research assesses the role of farmers in on-farm demonstrations and scaling-up of land management practices, and investigates effective ways to enhance beneficial interactions between researchers, extension workers and farmers in view of improving adoption.

Findings: The findings suggest that farmers can effectively participate in demonstrations and scaling-up of agricultural practices. This participation is enhanced by judicious incentives such as higher crop yields that motivate farmers and influence adoption. The current success of the approach stems from the fact that farmers, extension workers and researchers jointly implement the activities and their different aims were achieved simultaneously: scientific results for researchers, better agricultural practices for extension workers, and economic success and free choice for farmers.

Practical implications: This research concludes that farmers have the capacities to play an innermost role in demonstrations and scaling-up of agricultural practices. However, there is a need to build and strengthen their capacities to facilitate their participation and contribution.

Originality/Value: The article demonstrates the value of the preponderant role of farmers in on-farm demonstrations and scaling-up practices by exhibiting the beneficial interactions between researchers, extension workers and farmers.     

A customised Total Quality Management Framework for schools

Abstract

Research has revealed that many of the historically disadvantaged schools in South Africa experience difficulty in implementing policies aimed at restoring the quality of teaching and learning. The difficulty has been attributed to several factors such as poor conceptualisation and implementation of quality management systems at school level. This article reports on empirical research that investigated the possibility of applying Total Quality Management principles in schools for the purpose of restoring the culture of learning and teaching. Data was collected through qualitative and quantitative methods in selected schools situated in the Tshwane North District. The findings revealed that there is a gap between what is provided in the policy framework on the management of quality teaching and learning. It is recommended that in order to fill the gap, schools need to apply customised principles of Total Quality Management. The primary aim of this research was to develop such an integrated framework that is not only theoretically sound but that has been customised for schools’ contexts and conditions.     

Pedagogical shift in the twenty-first century: Preparing teachers to teach with new technologies

ABSTRACT

The expectation in education today is that pre-service teachers should graduate from teacher education adequately prepared to teach with Information Communication Technologies (ICTs) that have potential to enhance curriculum delivery, hence improving quality of education. However, research shows that pre-service teachers are graduating from teacher education underequipped to teach with ICTs. The aim of this study is to understand why, given the deployment of ICTs for teaching and learning in teacher education, the new teachers remain underprepared to teach with ICTs. Qualitative research approach was employed in this study, whereby randomly selected pre-service teachers were interview respondents. Written reflections on their preparation to teach with ICTs also formed part of the data collected. Technological Pedagogical and Content Knowledge (TPACK) theory was embraced to guide the study. Analysis of the data shows that the main contributing factor of the new teachers’ under-preparedness to teach using ICTs is the quality of instruction they receive during their training.     

光子晶体线缺陷波导中的光孤子通信研究

采用平面波展开法分析光子晶体线缺陷波导结构的色散效应,用理论结合数值模拟的方法研究了光孤子的产生机理,给出了波导的色散曲线和入射脉冲的透射谱。结果表明群速度色散(GVD)和自相位调制(SPM)同时起作用时能够实现光孤子传输。     

基于PCA-LLE组合的优化RBF神经网络降水预测模型

提出了主成分分析(PCA)和局部线性嵌入降维方法(LLE)组合的优化RBF神经网络降水预测模型,首先利用主成分分析(PCA)和局部线性嵌入降维方法(LLE)组合对众多气象物理因子降维提取有效因子,再将这些综合有效因子组成的特征空间矩阵作为优化的RBF神经网络的输入矩阵,从而建立网络模型.以此对广西5月三个不同区域平均日降水量进行预报实验,结果表明,该模型具有较好的收敛效果和泛化能力,在预报性能上明显优于同期的T213降水预报、PCA预报、LLE预报,预报稳定性好,预报准确率较高,具有一定的普遍适用性.     

GLABROUS INFLORESCENCE STEMS regulates trichome branching by genetically interacting with SIM in Arabidopsis

Arabidopsis trichomes are large branched single cells that protrude from the epidermis. The first morphological indication of trichome development is an increase in nuclear content resulting from an initial cycle of endoreduplication. Our previous study has shown that the C2H2 zinc finger protein GLABROUS INFLORESCENCE STEMS (GIS) is required for trichome initiation in the inflorescence organ and for trichome branching in response to gibberellic acid signaling, although GIS gene does not play a direct role in regulating trichome cell division. Here, we describe a novel role of GIS, controlling trichome cell division indirectly by interacting genetically with a key endoreduplication regulator SIAMESE (SIM). Our molecular and genetic studies have shown that GIS might indireclty control cell division and trichome branching by acting downstream of SIM. A loss of function mutation of SIM signficantly reduced the expression of GIS. Futhermore, the overexpression of GIS rescued the trichome cluster cell phenotypes of sim mutant. The gain or loss of function of GIS had no significant effect on the expression of SIM. These results suggest that GIS may play an indirect role in regulating trichome cell division by genetically interacting with SIM.     

我国高校工程训练中心的建设与发展

工程训练中心是在工科高校内实施工程实践教学的基础性平台,是中国高等教育改革发展中出现的一个新事物,近10年来得到快速发展。基于国家级工程训练示范中心的相关数据统计,对工程训练中心的发展历程及其建设现状进行了介绍和分析。