Reproducing or Challenging Power in the Questions We Ask and the Methods We Use: A Framework for Activist Research in Urban Education

Many have argued that educational research does little to change (and may actually reproduce) the social-structural inequalities shaping the quality of high-poverty urban schools. Building from this premise, this paper asks: How can university-based scholars of urban education do research that encourages, produces, or informs change in urban schools and the conditions that shape them? I examine two broad aspects of urban educational research: the questions we ask and the methods we use. In both cases, I critique the dominant paradigm of technical rationality—one in which school failure is approached as a localized technical problem unveiled through neutral, objective, and experimental research methods. In contrast, I propose a paradigm of “political rationality” (Klees, Rizzini, & Dewees, 2000, Children on the streets of the Americas: homelessness, education and globalization in the United States, Brazil and Cuba. New York: Routledge) that approaches school failure and research practice as political issues situated within and shaped by social relations of power. Innovations in urban education research that reflect the logic of political rationality include: more contextualized and politicized analyses of urban schools, and the expanded use of engaged, collaborative, and participatory research methods. Drawing on this work and my experience implementing a participatory research project, I propose a framework for activist research in urban education, and critically evaluate the limits and possibilities of such work to effect change in urban schools.Kysa Nygreen is a UC President's Postdoctoral Fellow in the Community Studies Department, University of California, Santa Cruz, CA 95064, USA.     

论"吊球"在高职院校铅球教学中的运用

教学实验表明,在高职大学生铅球最后用力技术教学中,通过"推击吊球"等一系列教学手段的运用,有助于调动学生的积极性和提高运动成绩,有利于推铅球技术教学的改进。     

郑州大学基础课实验教学中心信息平台建设与应用

为了适应对基础课实验教学中心实行网络化、智能化管理的需求，构建了基于客户端／服务器（C／S）和浏览器／服务器（B／S）两种模式的“郑州大学基础课实验教学中心信息平台”。文章论述了信息平台的建设目标与设计思路，并对信息平台的系统结构以及各级用户的权限、功能、操作等做了详细说明。     

时代文化的压力与文体规范的变异--"潜在写作"文体特征的一种探讨

文体选择不仅是作家艺术特长和喜好的一种表现,也是由时代文化对作家施压所导致。“潜在写作”在文体上显现的边缘化特征,就是作家在20世纪50至70年代政治文化压力下坚持批判现实和个性化表达努力在文学形式上的一种体现,它呼唤一种更加开放的文学史视野对其进行历史的归纳评价。     

Equilibrating Pressure with Auto-Control Valve in Water Distribution Networks

This paper probes into the feasibility of equilibrating pressure of water distribution network through using auto-control valves in theory and in the economy. An optimal valve control model is designed to minimize the sum of squares of residual pressure in the network. Such an analog simulation has been performed on the year 2003 programming network of a certain littoral district in North China, through which this paper confirms that it is feasible to equilibrate pressure with auto-control valves in theory. The research work has brought about a discovery of applicable conditions of valves in economic feasibility, which avoids a great economic loss due to the wild use of auto-control valve. In addition, simulated annealing algorithm is applied to optimize valve settings and shown to identify global optimum or near-optimum.     

硅基光电子材料的研究

综述了硅基发光材料的研究新进展,分别以发光多孔硅、多孔碳化硅、纳米硅薄膜和发光硅基超晶格为例,分析讨论了其制备、物理特性及发光机理.     

新课程实施中教师压力的成因及应对策略

在新课程的实施过程中,处于第一线的广大中小学教师承受着巨大的压力.造成这些压力的原因是多方面的,大致可以从内部和外部两方面来对其进行分析.在新课程的教育实践中应从这两个方面入手帮助教师缓解心理压力,使其教育教学活动更有利于新课程的推行.     

A pair of two-component regulatory genes ecrA1/A2 in S.coelicolor

Two-component genes are kinds of genetic elements involved in regulation of antibiotic production in Streptomyces coelicolor. DNA microarray analysis revealed that ecrA1/A2, which mapped at distant sites from red locus and encode respectively the kinase and regulator, expressed coordinately with genes of Red specific biosynthetic pathway, ecrA1 and ecrA2 gene-disruptive mutants were constructed using homogenotisation by reciprocal double crossover. Fermentation data showed that the undecylprodigiosin (Red) level of production was lower than that of wild-type strain. However, the change of the actinorhodin (Act) production level was not significant compared with wild type. Thus, these experiment results confirmed that the two-component system ecrA 1/A2 was positive regulatory element for red gene cluster.     

Simulink在单相桥式半控整流电路中的仿真研究

通过仿真软件Matlab/Simulink,建立单相桥式半控整流电路的动态仿真模型,验证模型的正确性,并证明了该模型具有直观、快捷、灵活等优点,从而为《电力电子变流技术》教学中,引入一个有效的教学辅助手段。     

基于MATLAB的FIR/IIR滤波器分析与设计研究

数字滤波器在数字信号处理领域中已经得到广泛应用,利用MATLAB的数字滤波器设计工具箱可以快速有效地设计各种FIR/IIR数字滤波器,设计简单方便。在设计过程中可以随时对比设计要求和滤波器特性,并可通过不断调整参数,以使滤波器的设计达到最优化。