The elusive nature of whole system improvement in education

Whole system improvement—where the vast majority of schools improve—is difficult to achieve. Some jurisdictions use what turns out to be ‘wrong’ policy drivers like testing and evaluation. Rather, success turns out to depend on changing the culture of schools and their relationship to the infrastructure of policies and regulation. I examined the six cases studies in the light of whole system change criteria. Two of the case studies, South Africa and India, represent limited but useful examples in that they focus on basic skills like literacy. A second set of two studies, Escuela Nueva and LCP in Mexico, represent strong examples of how bottom up strategies can spread to significant levels. The final two, Long Beach in the US and Ontario, are strong examples of how deep change can be accomplished by focusing on a few core priorities and then building a culture over a number of years to support and sustain the changes. The paper then draws conclusions about the conditions that will be required for large scale change to occur.     

一种用于宽动态范围上的高精度散射测量的标准方法

The co-effect of transmitted power fluctuation and system nonlinearity produce deviations in scatterometer measurement results . An internal calibration method to deal with this problem is proposed. The method can result in more precise scatterometric measurements in a wide range. The basic principle of the method is combining real-transmitted-power detection with the calibration of system nonlinearity. A practical scheme to implement the method is also presented, which is developed based on a special designed mechanism of a microwave radiometer-scatterometer combined system.     

The rewarding effects of number and surface area of food in rats

Visual cues have an important role in food preference for both rats and humans. Here, we aim to isolate the effects of numerosity, density, and surface area on food preference and running speed in rats, by using a forced-choice maze paradigm. In Experiment 1, rats preferred and ran faster for a group of multiple smaller pellets rather than a single large pellet, corroborating previous research (Capaldi, Miller, & Alptekin Journal of Experimental Psychology: Animal Behavior Processes, 15(1), 75–80, 1989). Further experiments tested the prevailing hypothesis that multiple food pieces are more reinforcing because they occupy a larger surface area. Experiment 2 controlled for numerosity by utilizing a continuous food: mashed potatoes flattened to cover a larger surface area or rounded into a ball. The rats preferred and ran faster for the flattened potatoes, suggesting surface area plays a role in quantity estimations. Finally, in Experiment 3, rats displayed no preference or difference in running speed between a group of scattered and clustered pellets when number of pellets were kept constant. Taken together, these results suggest that density has an important role in food perception—that is, the rewarding effect of higher numerosity or larger surface area is removed when the food does not fill out the entire space. Alternative explanations and implications for human diet are discussed.     

Action research as a bridge between pre‐service teacher education and in‐service professional development for students and teacher educators

The first part of this paper describes the rationale for and process of engaging student teachers in action research during the fourth and final year of their teacher education, which is also their first year as teachers (induction year). During this year the novice teachers are engaged in an action research project as a compulsory assignment in the course ‘Teacher as researcher’. The objective of the course is to provide novice teachers with reflective tools for systematic examination of their work as teachers. The second part of the paper documents the learning process of the teachers of the course (which can also be viewed as action research), since we jointly planned the course, engaged in reflective dialogues with the students and among ourselves and systematically examined our work by personal diary writing and inviting informal and more formal (questionnaire) feedback from the students. The process of our action research is documented in this paper, whereas the product is hopefully implemented in teaching a better course and in more effective support of our students.

La première partie de cet article explique la logique d'une recherche basée sur l'action menée pendant la quatrième et dernière année de formation éducative, qui par ailleurs est aussi la première année de pratique comme enseignant (année d'essai). Pendant l'année, les novices doivent s'adonner à un projet de recherche pour le cours ‘Enseignant comme chercheur’ dont le but est de leur procurer des outils de réflexion pour pouvoir examiner systématiquement leur travail comme enseignant. La seconde partie de l'article illustre ce que nous, les professeurs du cours, apprenons, ce qui peut être considéré comme recherche basée sur l'action puisque nous avons pensé le cours conjointement, et avons établi des dialogues de réflexion avec les étudiants et entre nous, avons systématiquement examiné notre travail en tenant un journal, avons requis des commentaries critiques formels (sous forme d'un questionnaire) et informels des étudiants. Le processus de notre recherche basée sur l'action est illustré dans cet article et nous espérons que son fruit se fera sentir dans un cours meilleur et un soutien plus efficace des étudiants.

La primera parte de este trabajo describe el racional y el proceso de involucramiento de estudiantes de marcos de formación docente en la investigación en acción, durante el cuarto y último año de su formación, el cual a su vez constituye el primer año como docentes (año de prueba). Durante este año los jóvenes docentes se involucrarán en el proyecto de investigación en acción como una tarea obligatoria en el marco del curso ‘El docente como investigador’. El objetivo del curso es de proveer a los jóvenes docentes de herramientas reflexivas para lograr un análisis sistemático de su labor como docentes. La segunda parte del trabajo documenta el proceso de enseñanza de los docentes del curso, nosotros, que a su vez puede ser visto como una investigación en acción ya que hemos planificado el curso en conjunto, nos sumergimos en diálogos reflexivos con los estudiantes y entre nosotros, y hemos analizado sistemáticamente nuestra tarea a través de la escritura de un diario personal, además de solicitar en forma informal y más formal (cuestionario) una retroalimentación de parte de los estudiantes. El proceso de investigación en acción se documenta en este trabajo, esperamos que el producto del mismo sea implementado en el mejoramiento del curso y un apoyo más eficaz para nuestros estudiantes.

Der erste Teil dieses Artikels beschreibt die Leitgedanken und Vorgehensweise eines Aktionsforschungsprojekts mit Lehramtsstudenten im vierten (somit letzten) Jahr ihrer Ausbildung, das zugleich ihr erstes Jahr als Lehrer ist (‘Bewährungsjahr’). Im Laufe dieses Jahrs sind die Neulehrer verpflichtet, an einem Aktionsforschungsprojekt im Rahmen einer Pflichtlehrveranstaltung, ‘Lehrende als Forschende’ teilzunehmen. Ziel dieser Lehrveranstaltung ist es, Neulehrer mit reflektiven Instrumenten für die systematische Untersuchung ihrer eigenen Arbeit als Lehrer auszurüsten. Im zweiten Teil dieses Artikels wird der Lernprozess der Lehrpersonen dokumentiert, die diese Pflichtlehrveranstaltung gemeinsam entwickelten und abhalten. In kritsch‐reflektivem Dialog mit den Studierenden und miteinander, durch Führen eines perseonlichen Tagebuchs und Auseinandersetzung mit formalen und informalen Reaktionen der Studierenden auf die Lehrveranstaltung, fand somit ein Aktionsforschungsprojekt der Lehrerausbilder selbst statt. Der Lernprozess, der sich in diesem Artikel niederschlägt, wird in einer verbesserten Lehrveranstaltung und einer effektiveren Unterstützung der Studierenden beim Übergang in die Berufswirklichkeit umgesetzt.     

Using Variables in School Mathematics: Do School Mathematics Curricula Provide Support for Teachers?

This study employed content analysis to examine 3 popular middle-grades mathematics curricula in the USA on the support they provide for teachers to implement concepts associated with variables in school mathematics. The results indicate that each of the 3 curricula provides some type of support for teachers, but in a varied amount and quality. More specifically, whereas the University of Chicago School Mathematics Project (UCSMP) curriculum provides support for teachers on several aspects of using variables in school mathematics, the support found in the Connected Mathematics 2 and the Math Connects curricula focused mainly on one conception of variables—namely, the use of variables as quantity that varies in the Connected Mathematics 2 curriculum and the use of variables as specific unknowns in the Math Connects curriculum. Overall, the UCSMP curriculum provides the most support for teachers, followed by the Connected Mathematics 2 curriculum, with the Math Connects curriculum recording the least support for teachers to enact variable concepts. It is worth pointing out that, although the 3 curricula collectively provide guidance for teachers to implement variable ideas within meaningful real-world contexts, the supports identified in the respective curriculum were not sufficient in addressing all of the areas that are essential for teaching the many concepts associated with variables in school mathematics effectively. Recommendations for curriculum developers and for international researchers with interest in the roles of variables in school mathematics are provided.     

自聚焦克尔类电介质中非傍轴光束调制非稳的研究

Propagation stability of non-paraxial beam in nonlinear Kerr media is investigated with a linear stability method.Both theoretical analysis and numerical simulation show that modulation instability(MI) gain spectrum has three different distribution features determined by the times of incident power P0 and the non-paraxial parameter a. Furthermore,the corresponding criterion is put forward to distinguish the three different distributions.     

Large amplitude free vibration of a flexible panel coupled with a leaking cavity

This paper addresses the effect of leakage on the natural frequencies of a large amplitude vibrating panel backed by a cavity, which has not been considered in many other related studies. The structural-acoustic governing equations are employed to study this nonlinear problem. An elliptical integral method, which was recently developed for the nonlinear panel cavity problem, is introduced here to solve for the structural-acoustics responses. The present results agree reasonably well with those obtained from the classical harmonic balance method. Modal convergences of the nonlinear solutions are performed to verify the proposed method. The effects of vibration amplitude and leakage size are studied and discussed. It is found that (1) the edge leakages in a panel cavity system significantly affect the natural frequency properties, and (2) the edge leakages induce a low frequency acoustic resonance.     

Exploring Relationships Among Belief in Genetic Determinism,Genetics Knowledge,and Social Factors

Genetic determinism can be described as the attribution of the formation of traits to genes, where genes are ascribed more causal power than what scientific consensus suggests. Belief in genetic determinism is an educational problem because it contradicts scientific knowledge, and is a societal problem because it has the potential to foster intolerant attitudes such as racism and prejudice against sexual orientation. In this article, we begin by investigating the very nature of belief in genetic determinism. Then, we investigate whether knowledge of genetics and genomics is associated with beliefs in genetic determinism. Finally, we explore the extent to which social factors such as gender, education, and religiosity are associated with genetic determinism. Methodologically, we gathered and analyzed data on beliefs in genetic determinism, knowledge of genetics and genomics, and social variables using the “Public Understanding and Attitudes towards Genetics and Genomics” (PUGGS) instrument. Our analyses of PUGGS responses from a sample of Brazilian university freshmen undergraduates indicated that (1) belief in genetic determinism was best characterized as a construct built up by two dimensions or belief systems: beliefs concerning social traits and beliefs concerning biological traits; (2) levels of belief in genetic determination of social traits were low, which contradicts prior work; (3) associations between knowledge of genetics and genomics and levels of belief in genetic determinism were low; and (4) social factors such as age and religiosity had stronger associations with beliefs in genetic determinism than knowledge. Although our study design precludes causal inferences, our results raise questions about whether enhancing genetic literacy will decrease or prevent beliefs in genetic determinism.