具有连续时滞和扩散的非自治Holling竞争系统的持续性和全局吸引性   总被引：1，自引：0，他引：1  

严建明  张弘  罗桂烈 《衡阳师范学院学报》2004,25(6):12-14

本文讨论了具有连续时滞和Ⅲ类功能性反应的非自治扩散竞争系统。此系统有两个种群两个斑块。其中一个种群可以在两斑块中自由扩散，另一种群被限定在一斑块中不能扩散。给出了系统种群的持续生存，周期解存以及全局吸引的充分条件。  相似文献   

A teacher-report measure of children's task-avoidant behavior: A validation study of the Behavioral Strategy Rating Scale     

Xiao Zhang  Jari-Erik Nurmi  Noona Kiuru  Marja-Kristiina Lerkkanen  Kaisa Aunola 《Learning and individual differences》2011,21(6):690-698

This study aims to validate a teacher-report measure of children's task-avoidant behavior, namely the Behavioral Strategy Rating Scale (BSRS), in a sample of 352 Finnish children. In each of the four waves from Kindergarten to Grade 2, teachers rated children's task-avoidant behavior using the BSRS, children completed reading and mathematics tests, and trained testers rated children's task-avoidant and social-dependent behavior after the test situation. Mothers also rated children's task-avoidant behavior in the last two waves. The results showed that a two-factor model including one factor representing task avoidance and one method factor accounting for wording effects among the negatively phrased items fitted the data best. The scale demonstrated strict measurement invariance across all four waves and satisfactory convergent and discriminant validity. Teacher-reported task avoidance was negatively associated with performance in reading and mathematics. The results suggest that the BSRS is a reliable, valid, and developmentally suitable instrument.  相似文献   

论美国大学生在校学习的持续性问题--城乡学生的对比分析     

严文蕃  杜娟  黄建如 《复旦教育论坛》2003,1(2):9-13

本文选取了美国国家教育统计中心收集的长期跟踪数据，描述了美国都市和乡村高中毕业生在高等院校的学习持续性问题，同时分析了影响上述两大群体在校学习持续性的因素。  相似文献   

A Door Must Be Opened: Perceptions of Students with Disabilities in Higher Education     

Nina Yssel  Natalya Pak  Jayne Beilke 《International Journal of Disability, Development & Education》2016,63(3):384-394

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我国股票市场的异常现象分析     

贾学飞  杨文杰 《杨凌职业技术学院学报》2011,10(3):44-46,60

金融市场是一个复杂的体系,早在19世纪人们就开始了对金融市场价格、风险等问题的研究和预测并建立了相关的基础理论,但目前研究证明完全有效市场假设理论已不能解释金融市场的实际行为。本文借助于经济物理学的消除趋势波动分析法和方差分析法,以上证综合指数和深证综合指数的日数据和15分钟高频数据为基础,探讨我国股票市场存在的异常现象。结果表明,我国股票市场存在持久性和日内＂U＂形波动特征,进一步证明我国股票市场是一个非完全有效市场。  相似文献   

论阎连科《日光流年》里的生与死     

乔媛 《科教文汇》2015,(2)

阎连科的《日光流年》讲述的是在耙耧山脉深处的几乎与外界隔绝的三姓村的故事。三姓村村民全都活不过四十岁,这也注定了死亡与生育生活生存的较量。历届村长带领村民与死亡斗争,充满北方人的对“生的坚强”和“死的挣扎”。三姓村村民的“生的坚强”表现在生育、生存和生活三个方面,而“死的挣扎”则表现在死亡的方式、意义和对棺材的重视三个方面。阎连科这种对死亡和生育的变态迷恋正是出于他对生命的热爱与绝望。  相似文献   

Indigenous students' persistence in higher education in Australia: contextualising models of change from psychology to understand and aid students' practices at a cultural interface     

Andrew Day  Vicky Nakata  Martin Nakata  Gregory Martin 《高等教育研究与发展》2015,34(3):501-512

The need to address the substantial inequities that exist between Indigenous and non-Indigenous Australians in higher education is widely recognised. Those factors that affect the performance of Indigenous students in tertiary education have been reasonably well documented across different institutions, disciplines, and programme levels but there has, to date, been less consideration of the processes by which Indigenous students either persist or desist in higher education. This paper aims to present a conceptual understanding of academic persistence that can inform the delivery of tailored academic support interventions to Indigenous students who are at high risk of leaving higher education.  相似文献   

Mastery Motivation in Children with Intellectual Disability: Is there Evidence for a Down Syndrome Behavioural Phenotype?     

Linda Gilmore  Monica Cuskelly  Melissa Browning 《International Journal of Disability, Development & Education》2015,62(3):265-275

The main purpose of the current study was to provide empirical evidence to support or refute assumptions of phenotypic deficits in motivation for children with Down syndrome (DS). Children with moderate intellectual disability (MID) associated with etiologies other than DS were recruited in an extension of a previous study that involved children with DS and typically developing children. The participants were 29 children with MID and 33 children with DS who were matched on mental age to 33 typically developing children, aged 3–8 years. Mastery motivation was assessed on task measures of curiosity, preference for challenge and persistence, as well as parental reports. There were no significant group differences on the mastery motivation tasks. Parental ratings of mastery motivation differed, with typically developing children generally being rated more highly than each of the disability groups. The view that motivational deficits are part of the DS behavioural phenotype was not supported.  相似文献   

‘It's more flexible’: persistence of women engineers in the academy     

Yeukai Angela Mlambo  Reitumetse Obakeng Mabokela 《European Journal of Engineering Education》2017,42(3):271-285

The under-representation of women in engineering is an issue of concern for policy-makers. While much of the existing literature has focussed on understanding reasons for women's under-representation in engineering and related technical fields, there is a paucity of research that examines why women who are already in engineering persist. This study aims to answer the question, why do women engineers in academe persist in a discipline that is generally perceived to be inhospitable to women. Three main challenges, namely gender discrimination, lack of institutional and disciplinary support, and the rigid nature of the workplace, emerged as key impediments to women engineers in the private sector. In contrast, women engineers in the academy identified the flexibility offered by academic environments, the presence of personal support networks, and a passion for teaching and students as critical factors that influenced their decision to remain in academia.  相似文献   

Diagnostic Dilemma of HbA1c Detection in Presence of a Hemoglobinopathy: A Case Report     

Bhat VS  Dewan KK  Krishnaswamy PR 《Indian journal of clinical biochemistry : IJCB》2011,26(1):91-95

We report a case of a diabetic, heterozygote with near normal hematology, marginally low level of hemoglobin A₂(HbA₂) having an increased level of hemoglobin F(HbF) that was pancellularly distributed among the red cells. BioRad DiaSTAT measurements gave a high glycated hemoglobin A1c(HbA1c) of 31.5% and the BioRad Variant analyzer recorded an HbA1c value which was very low, in discordance with the detected blood glucose levels. Flow cytometry and polymerization chain reaction (PCR) based studies were carried out which revealed the case to be that of the common hereditary persistence of fetal hemoglobin (HPFH)-3, an Asian Indian mutation. Fructosamine estimation and HbA1c by Boronate affinity chromatography were able to resolve the discordant value detected and was able to confirm the diabetes status. The case would have been a diagnostic dilemma, if reported without correlation.  相似文献