Corrosivity of environment and the current state of the steel elements at the former Auschwitz concentration camp

The objective of this study was to assess corrosivity of the atmospheric environment in the former Auschwitz I and Auschwitz II-Birkenau concentration and extermination camp, and to identify the protective properties of existing corrosion products in order to estimate the actual corrosion rate of original steel elements located there. The current atmospheric corrosivity of the former Auschwitz camp, specified during one year of exposure of steel samples according to the EN ISO 12944-2 (1998) standard, was determined and it can be described as a boundary between the low C2 and medium C3. The steel corrosion rate in these conditions was in the range of 14–34?µm/year with the average rate of 27?µm/year. A layer of corrosion products formed on uncovered original reinforcement steel rods during ca. 70 years of atmospheric exposure was examined in terms of their protective properties with respect to steel. The microstructure, chemical composition, and elemental chemical state were analyzed by means of scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. Potentiodynamic polarization and electrochemical impedance spectroscopy methods were employed to investigate the corrosion resistance of the carbon steel covered with a layer of corrosion products. It has been estimated that this layer slows down the corrosion rate of steel by about five times. Hence, it can be concluded that the corrosion rate of the original steel parts under the layer of corrosion products should not exceed 7?µm/year.     

The study of teachers' written feedback to students' writing: changes in theoretical considerations and the expansion of research contexts

This paper identifies four successive phases in the study of written feedback to students' compositions. The studies included in these phases are distinguished by views of writing instruction reflected in their theoretical frameworks: the view of writing instruction as a series of teacher provided stimuli and students' responses to these stimuli; the view that the writing class is a rhetorical community, where teacher and students interact as readers and writers over texts; the view of learning to write as a phenomenon both natural and problematic, where school may interfere with students' natural development; the view that learning to write, like all other learning, depends on successful student-teacher interactions within student's zone of proximal development. While reviewing recent studies of written feedback, the paper shows how these changing views of writing instruction are accompanied by changing theoretical perspectives for the study of the provision and processing of written feedback as well as by a gradual expansion of research contexts for looking at this problem. Finally, in view of such a line of development, it suggests an agenda for future research.     

The rate of acquisition of formal operational schemata in adolescence: A secondary analysis

A theoretical model of cognitive development is applied to the study of the acquisition of formal operational schemata by adolescents. The model predicts that the proportion of adolescents who have not yet acquired the ability to perform a a specific Piagetian-like task is an exponentially decreasing function of age. The model has been used to analyze the data of two large-scale studies performed in the United States and in Israel. The functional dependence upon age was found to be the same in both countries for tasks which are used to assess the following formal operations: proportional reasoning, probabilistic reasoning, correlations, and combinatorial analysis. Different functional dependence was found for tasks assessing conservation, control of variables, and prepositional logic. These results give support to the “unity” hypothesis of cognitive development, that is, the hypothesis that the various schemata of formal thought appear simultaneously.     

Cultivating morphological awareness improves reading skills in fifth-grade Hebrew readers

The effectiveness of an intervention program aimed at improving morphological awareness was evaluated in Hebrew-speaking poor readers in Grade 5. The 12-week intervention in small groups focused on learning morphological structure of words by identifying, decomposing, and constructing morphologically complex words. Results were compared with a comparison group of similarly poor readers that participated in the school’s reading support program focused on reading comprehension strategies. The intervention group improved morphological awareness to a greater extent than the comparison group and also showed a clear advantage in their reading accuracy and reading comprehension. The results suggest that morphological instruction develops awareness of the morphemic structure of words that contributes to extracting meaning from texts.     

Which Type of Inquiry Project Do High School Biology Students Prefer: Open or Guided?

In teaching inquiry to high school students, educators differ on which method of teaching inquiry is more effective: Guided or open inquiry? This paper examines the influence of these two different inquiry learning approaches on the attitudes of Israeli high school biology students toward their inquiry project. The results showed significant differences between the two groups: Open inquiry students were more satisfied and felt they gained benefits from implementing the project to a greater extent than guided inquiry students. On the other hand, regarding documentation throughout the project, guided inquiry students believed that they conducted more documentation, as compared to their open inquiry peers. No significant differences were found regarding ??the investment of time??, but significant differences were found in the time invested and difficulties which arose concerning the different stages of the inquiry process: Open inquiry students believed they spent more time in the first stages of the project, while guided inquiry students believed they spent more time in writing the final paper. In addition, other differences were found: Open inquiry students felt more involved in their project, and felt a greater sense of cooperation with others, in comparison to guided inquiry students. These findings may help teachers who hesitate to teach open inquiry to implement this method of inquiry; or at least provide their students with the opportunity to be more involved in inquiry projects, and ultimately provide their students with more autonomy, high-order thinking, and a deeper understanding in performing science.     

Building interfaces for on-line collaborative learning

For several years we have been engaged in the development and research of software environments for collaborative learning, for example in the recently completed CoLabs project (which we presented at the IFIP TC3 WG3.5 working conference in Budapest in 2004, see also http://matchsz.inf.elte.hu/Colabs/), also within lately defended long-range doctoral research, in which the co-author of this paper together with his undergraduate students had developed and evaluated cooperative computer activities for children aged 10 to 18. They observed children when using those environments and studied the influence of different approaches and solutions on the degree of their involvement and will to cooperate. We have also been involved in the London Knowledge Lab pilot project for developing a collaborative layered learning space travel games construction kit. Our department’s prior engagement in the development of collaborative activities also includes publishing a popular on-line journal (developed by A. Hrusecka and D. Lehotska, this on-line journal (in Slovak) can proudly boast up to 250,000 visits per month) for children, which intensively exploits on-line collaboration. This topic attracts us not only as a support for the learning process, but is a challenge for us as developers of educational programming tools as well. In our SuperLogo and Imagine environments we have always tried to provide users (ranging from children to developers) with new and powerful options to foster learning by exploring and developing. Thus we have equipped Imagine with the means for building objects and their behaviours in incremental loops, with parallel independent processes, event-driven programming and complex yet intuitive support for developing on-line environments for collaborative learning. In this paper we place our collaborative applications in the context of other related interfaces reported in literature. We use eight criteria to classify them and conclude that collaborative applications being developed by us and our students—future teachers—are distinguishable from others along two or three of those criteria: they combine in themselves typical features of Logo microworlds and inspiring support for on-line cooperation. We then analyze in detail our collaborative Imagine microworlds along four dimensions of their development. We specify means for establishing and maintaining on-line connection among any number of participants. We study tools for sending and receiving items (data, active characters with their behaviours, instructions etc.). We reflect on what can be shared by two or more participants in a collaborative activity. We examine all possible operations with common and private characters of a participant from the collaboration point of view. Our goals in this research and development are to:

1. Better understand potential the interfaces for on-line collaboration offer to support the learning process,
2. Place our Imagine Logo microworlds into context of other related applications,
3. Build a detailed map of all aspects important for their development (i.e., build a framework for the development),
4. Present the observations from our long-range experimental development and evaluation of the collaborative environments,
5. Point out how simple and natural it is (in the academic surroundings) to develop small and yet powerful collaborative microworlds—built for instance for immediate need in a classroom—with exceptional potential for interaction and openness.

Most of all, however, we want to motivate the endeavour to overcome all obstacles connected with the integration of on-line cooperation into children’s learning.     

VERBAL JUSTIFICATION—IS IT A PROOF? SECONDARY SCHOOL TEACHERS’ PERCEPTIONS

According to reform documents, teachers are expected to teach proofs and proving in school mathematics. Research results indicate that high school students prefer verbal proofs to other formats. We found it interesting and important to examine the position of secondary school teachers with regard to verbal proofs. Fifty high school teachers were asked to prove various elementary number theory statements, to write correct and incorrect proofs that students may use, and to evaluate given justifications to statements from elementary number theory. While all the participants provided correct proofs to the statements, our findings indicate that teachers are not aware of students’ preference for verbal justifications. Also, about half of the teachers rejected correct verbal justifications. They claimed that these justifications lacked generality and are mere examples.     

A University Administrative Information System: Getting People Involved and Combating Doubt

An on-line information system at Masaryk University, in the Czech Republic, has been functioning for a little more than two years. Its aim is to facilitate the management of the university and gradually to introduce state-of-the-art new information technologies into the full fabric of university life. Although the project has encountered some resistance, it has, little by little, gained acceptance as staff and students from all disciplinary areas have discovered ways in which it can make their work efficient.