抗战期间广州生活必需品价格研究

1937年8月31日,日军首次空袭广州,经历一年多的轰炸,广州于1938年10月沦陷。沦陷期间日军对广州的工业、商业、金融业的全面统制和掠夺,导致广州生活必需品价格较抗战前动荡多变,呈现出高涨至低廉,再由低廉至高涨,并最终走向崩溃的折线。抗战期间生活必需品价格畸形发展的最主要原因是战争;日军对广州实行经济操控以达其“以战养战”侵略政策导致金融秩序混乱;国民政府为了平衡收支大量增发货币导致严重通货膨胀,以及商人囤积居奇推动物价进一步高涨;加之抗战期间广东自然灾害频发,加重物资短缺。生活必需品价格动荡严重影响百姓生活,致使商业萧条,人民生活极度困难,饿殍载道,沦为难民者多。     

Training chemistry students to ask research questions

In previous studies, science students have been trained to ask more and better questions through intensive instruction apart from the ongoing academic program. Cognitive strategies (such as questioning) are developed best, however, within the framework of an academic subject. In the current study, questioning skills were taught to high school chemistry students in the context of their laboratory experiments. Since both intellectual development and questioning skills are causally related to problem solving, the effect of intellectual development on the learning of questioning skills also was investigated. The Piagetian model of intellectual development was chosen for its demonstrated effects on many important aspects of science instruction. The number and quality of student research questions was measured by the Science Inquiry Assessment Instrument. The student's level of intellectual development was measured by the Classroom Test of Formal Operations. The twelve-week experimental treatment involved printed lessons which taught students to ask research questions in response to unanticipated observations in their regularly scheduled laboratory experiments. The pretest exaggerated the effect of this treatment. This effect, however, was significant among unpretested students, accounting for 14% of the post-test score variance. The level of intellectual development has no effect on these post-test scores. These important questioning skills can be acquired within the framework of the regularly scheduled classroom activities by high school chemistry students, irrespective of their level of Piagetian intellectual development.     

Problem solving and classical genetics: Successful versus unsuccessful performance

Expert-novice problem-solving research is extended in this study to include classical genetics. Eleven undergraduates (novices) and nine graduate students and instructors (experts) were videotaped as they solved moderately complex genetics problems. Detailed analysis of these “think aloud” protocols resulted in 32 common tendencies that could be used to differentiate between successful and unsuccessful problem solvers. Experts perceive a problem as a task requiring analysis and reasoning and they tend to use a knowledge-development (forward-working) approach. They make frequent checks on the correctness of their work, use accurate and detailed bookkeeping procedures, and have a broader range of heuristics to apply to the problem. It is clear that studying problem solving using the expert/novice design requires that the problems be difficult enough to require more than more recall and yet simple enough to allow novices a chance for solution. Applying elementary probability concepts seemed to be the most difficult aspect of many of the genetics problems, even for the experts.     

Authentic Tasks Online: A synergy among learner,task, and technology

Fostering synergies amongst learner, task, and technology to create innovative and immersive distance learning environments runs counter to the widespread practice of incorporating traditional classroom pedagogical strategies into Web‐based delivery of courses. The most widely accepted model of online higher education appears to be one of reductionism, whereby learning management systems facilitate the design of easily digested packets of information, usually assessed by discrete stand‐alone tests and academic assignments. This article describes a model for the development of authentic tasks that can assist in designing environments of increased, rather than reduced, complexity. It provides a robust framework for the design of online courses, based on the work of theorists and researchers in situated learning and authentic learning. It describes the characteristics of a task's design that facilitates the requirements of an entire course of study being readily satisfied by its completion, where the students make the important decisions about why, how, and in what order they investigate a problem. The article describes several learning environments that were investigated in depth in the study, and explores the synergies that exist between the learners, tasks, and technology engaged in authentic learning settings. The article leads readers to a conceptual understanding of the role of authentic tasks in supporting knowledge construction and meaningful learning, and illustrates the principles of authentic task design for online learning environments.     

I like Facebook: Exploring Israeli high school chemistry teachers’ TPACK and self-efficacy beliefs

The goal of this research was to examine how Israeli chemistry teachers at high school level use Facebook groups to facilitate learning. Two perspectives were used: Teachers’ TPACK (Technological Pedagogical Content Knowledge) and the self-efficacy beliefs of chemistry teachers for using CLFG (chemistry learning Facebook groups). Three different case studies were chosen and qualitative and quantitative research tools were used to learn about the teachers’ self-efficacy beliefs and knowledge. More specifically, a validated questionnaire for measuring teachers’ self-efficacy beliefs for using Facebook and for integrating Facebook into teaching was developed. We show that the initial beliefs (not based on a real acquaintance of Facebook) were replaced by more realistic efficacy-beliefs after the teachers started to work with the CLFG and that the technological support provided to each teacher, together with their mastery experience, supported the development of strong self-efficacy beliefs regarding the use of CLFG. Teachers’ TPACK was investigated by analyzing their interviews and the interactions in their CLFG. We found that the notion regarding what constitutes learning in the CLFG had not changed during the experiment but rather, the teachers knew better how they can facilitate this leaning. In addition they better integrated links to videos and visualizations that supported understanding abstract chemistry concepts. Interestingly, the intervention that was conducted did not influence teachers’ perceptions of learning; however, it was found to serve as an additional tool for supporting their self-efficacy beliefs by providing vicarious experience for the teachers. We therefore recommend performing a longer intervention in the future.     

Multidisciplinary Decision Making Through Experiential Learning: Perspectives from Practical Trials

Recently many business management programs in institutions of higher learning have undergone significant change in orientation, content, and delivery. In order to ensure that the graduates acquire the education and skills needed in the organizations of the future, these institutions have attempted to bridge theoretical underpinnings with practical content. In so doing, administrators and instructors have given more emphasis to deliberate integration of discipline-specific material. In this article we draw on previous research in both adult and experiential learning to develop an innovative approach for role-playing using case studies in management education. However, unlike the traditional use of cases, our approach builds an experience around the case study company by surrounding learners with additional props to use in the decision-making process. We describe an experiential learning process that provides an opportunity for integration while capitalizing on the characteristics of adult learners. We have used the approach successfully in MBA programs in both Canada and the United Kingdom to challenge students to resolve some of the complex, multi-dimensional issues facing today's organizations. We have also found this approach to be transferable to other learning situations.