On the asymptotic behavior of solutions of certain second-order differential equations

In this paper, the second order non-linear differential equation

     

Subaltern voices and postcolonial schizophrenia: The political tensions of M.I.A.’s Kala

ABSTRACT

Banned from the U.S. during the “war on terror,” the British/Sri Lankan hip-hop artist M.I.A. responded by recording her 2007 album Kala in multiple locations throughout the global South, collating indigenous musical styles and unorthodox recording techniques. Via a critical/cultural analysis, this paper explores M.I.A.’s work on Kala as subaltern resistance mobilized by “differential movement,” particularly in its mode of production, which operated outside of, and in opposition to, institutional mechanisms designed to expunge or neutralize politically subversive art and artists. Yet M.I.A.’s musical sampling also surfaces conflicts between creative freedom and cultural appropriation, emblematizing “postcolonialist/postmodern schizophrenia” (Vályi, 2011. Remixing cultures: Bartók and Kodály in the age of indigenous cultural rights. In K. McLeod & R. Kuenzli (Eds.), Cutting across media: Appropriation art, interventionist collage, and copyright law (pp. 219–236). Durham, NC: Duke University Press.).     

Responding to information about children in adversity: Ten years of a differential response model in Western Australia

This article uses a comprehensive database about children in adversity collected over the 16-year period from 1990 to 2005 in the state of Western Australia. The focus of this interrogation is the effect of major changes in responses to information about children brought to the attention of the Western Australian statutory authority in a 10-year period during this 16 years. The initiative for these changes was termed New Directions, and its associated policy and practice changes were aimed at differentiating information expressing concerns about children and families from allegations of child maltreatment. They emphasized the provision of supportive and empowering services to families experiencing difficulties – a form of differential response to children in adversity. The article covers the period leading up to the policy and practice change and the 10 years during which these changes were implemented. It examines some effects of the new policy and comments on whether the changes resulted in missed opportunities to protect children from harm, which in turn, might have led to higher rates of re-reporting. The authors present an overall picture of the nature of the information accepted by the statutory authority and how the interpretation of that information might have affected subsequent outcomes for children. In doing so, it shows that the policy and consequential practice changes associated with a differential response mechanism had long lasting positive effects that, despite dire warnings, did not compromise the protection of the small group of children identified as requiring protective interventions.     

基于差分因子的血氧饱和度算法研究

传统无创双波长血氧饱和度测量方法忽略了光散射对测量精度的影响。通过研究分析人体组织中光散射对吸收度的影响,引入了人体差分路径因子,优化了光的传播路径计算方法,改进了时变光谱算法,有效解决了光在人体中的散射造成的测量误差大的问题。     

Teacher behavior as a mediator of the relationship between teacher judgment and students' motivation and emotion

The study examines whether teacher behavior is a mediator of the relationship between teacher judgment and students' motivation and emotion. Two hundred forty-six sixth grade students completed a standardized English test and answered a questionnaire on motivation, emotion, and perception of differential teacher behavior. Thirteen English teachers assessed students' test performance. Students underestimated in test performance showed lower motivation and emotion than students overestimated in test performance. The two student groups perceived differential teacher behavior. Teacher behavior mediated the relationship between performance judgments and students' motivation and emotion. A rethinking of teacher's behavior towards students might counter these undesirable tendencies.     

新汉语水平考试HSK(六级)的性别公平性评估

本文通过对2011年新汉语水平考试HSK(六级)8次考试的试题进行项目功能差异(DIF)分析,以评估其性别公平性。结果显示,800个试题中存在DIF的题目占总数的3.3%;800个试题的MH值平均数为0.02,其95%置信区间包含0,即试卷总体上不存在DIF。因此,HSK(六级)具有较理想的性别公平性。     

一种噪声近似图像的质量区分方法

文中针对图像间质量差别微小而需评价的难题,提出了一种新的基于偏微分方程放大模型的全参考图像质量客观评价方法.算法利用偏微分方程在图像放大过程中能够较好地保持图像的边缘特征和细节信息的优点,通过比较放大后的图像加权峰值信噪比变化的情况,得出全参考图像质量评价指标-M_HPSNR.实验结果为类似的需要区分质量近似图像的需求提供了技术参考.     

论微分方程的定解及其问题形成

从微积分方程的历史发展角度来看,定解对微分方程理论的发展与形成具有极强重要的意义,也是众多数学家长久以来研究的主要方向。文章探讨了微分方程的定解,并阐述了当前关于微分方程研究的主要问题。     

变量替换法求可降阶的高阶微分方程

本文总结两种用变量替换求解的高阶微分方程,希望学生在学习方法有改变,灵活运用变量替换法。