The Concept of Nondeterminism: Its Development and Implications for Teaching

Nondeterminism is a fundamental concept in computer science that appears in various contexts such as automata theory, algorithms and concurrent computation. We present a taxonomy of the different ways that nondeterminism can be defined and used; the categories of the taxonomy are domain, nature, implementation, consistency, execution and semantics. An historical survey shows how the concept was developed from its inception by Rabin & Scott, Floyd and Dijkstra, as well as the interplay between nondeterminism and concurrency. Computer science textbooks and pedagogical software are surveyed to determine how they present the concept; the results show that the treatment of nondeterminism is generally fragmentary and unsystematic. We conclude that the teaching of nondeterminism must be integrated through the computer science curriculum so that students learn to see nondeterminism both in terms of abstract mathematical entities and in terms of machines whose execution is unpredictable.

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Does entrepreneurship education matter? Business students’ perspectives

The paper presents the findings of a mixed-methods study investigating the perceptions of business students in the Czech Republic towards entrepreneurship education, and examining the factors influencing their level of intention to be entrepreneurs. The results indicate that family background significantly influences the student’s entrepreneurial intention, and that participation in entrepreneurship-oriented courses positively influences the student’s level of self-efficacy. The study revealed further that business education had some effect on the student’s ability to gain the necessary knowledge for entrepreneurship. Another key finding was that entrepreneurship education specifically for business students has to equip students with entrepreneurial skills, attributes and behaviours. The results also suggest that entrepreneurship education is a contextually determined concept which requires modification of content and methods to meet the specific needs of particular target groups. The study has important implications for higher education institutions in terms of designing and managing effective entrepreneurship education.     

Children at risk for learning disorders: multiple perspectives

This study examined the contribution of a multidimensional model of risk factors in explaining adaptive functioning among 5- to 6.5-year-old kindergartners with mild developmental delays who were considered at risk for developing learning disorders. Risk factors included (a) child characteristics, (b) maternal and familial ecological variables, and (c) the child's attachment style as perceived by the mother. The sample included 145 Israeli mother-child dyads: 70 mothers and their children at risk for developing learning disorders (51 boys, 19 girls) and 75 mothers and their typically developing children (46 boys, 29 girls) from the same general education kindergartens. Data were collected from children's self-reports, mothers' narratives, and teachers' ratings. Path analysis examined the multidimensional risk model for the two groups. The study indicated a high fit between the theoretical model and the empirical findings and showed a different pattern of relations between the model's components for the two populations studied.     

Dissociations between serial position and number of letters effects in lateralised visual word recognition

Some previous studies of visual word recognition have reported an interaction between visual field and word length (measured by number of letters), such that recognition is affected more by word length for words presented in the left than for words presented in the right visual field. However, when manipulating serial position of letters in words to measure length effects, there are also reports of symmetrical word length effects in the two visual fields. Here we report two experiments, presenting four‐ and seven‐letter words, suggesting that the serial position and length effects in the hemispheres are separable and task dependent. For tasks that rely more heavily on letter‐level processing such as letter search (Experiment 1), performance in both hemifields showed similar effects of serial position; however, when comparing four‐ and seven‐letter words, an effect of word length was evident only in the left visual field, in line with the well‐established interaction between word length and hemifield. An interaction between word length and hemifield was confirmed for the same stimuli when they were employed in a lexical decision task, which forced whole‐word processing (Experiment 2). We conclude that the effects of serial position and number of letters in the two visual fields are separable, and are selectively affected by task type.     

Experienced Teachers’ Pedagogical Content Knowledge of Teaching Acid–base Chemistry

We investigated the pedagogical content knowledge (PCK) of nine experienced chemistry teachers. The teachers took part in a teacher training course on students’ difficulties and the use of models in teaching acid–base chemistry, electrochemistry, and redox reactions. Two years after the course, the teachers were interviewed about their PCK of (1) students’ difficulties in understanding acid–base chemistry and (2) models of acids and bases in their teaching practice. In the interviews, the teachers were asked to comment on authentic student responses collected in a previous study that included student interviews about their understanding of acids and bases. Further, the teachers drew story-lines representing their level of satisfaction with their acid–base teaching. The results show that, although all teachers recognised some of the students’ difficulties as confusion between models, only a few chose to emphasise the different models of acids and bases. Most of the teachers thought it was sufficient to distinguish clearly between the phenomenological level and the particle level. The ways the teachers reflected on their teaching, in order to improve it, also differed. Some teachers reflected more on students’ difficulties; others were more concerned about their own performance. Implications for chemistry (teacher) education are discussed. Submitted to Research in Science Education     

How simple is reading in Arabic? A cross‐sectional investigation of reading comprehension from first to sixth grade

This study aimed to examine, from a cross‐sectional perspective, the extent to which the simple view of reading (SVR) model can be adapted to the Arabic language. This was carried out by verifying, in both beginning and more skilled readers, whether the unique orthographical and morphological characteristics of Arabic contribute to reading comprehension beyond decoding and listening comprehension abilities. Reading comprehension was evaluated in a large sample of first to sixth‐grade Arabic‐speaking children. The participants' decoding and listening comprehension abilities were investigated together with their orthographic and morphological knowledge. Path analysis indicated that reading comprehension was moderately explained by the SVR (56–38%). Orthographic and morphological knowledge explained an additional 10–22% of the variance beyond that explained by the basic SVR components. These findings demonstrate that certain linguistic aspects of Arabic impact reading processes differently when compared with other languages. The psycholinguistic implications of these findings are discussed in the light of previous findings in the literature.

What is already known about this topic?

• The ‘simple view of reading’ model explains reading comprehension as the product of decoding and listening comprehension.
• This model explains between 70% and 83% of the variance in reading comprehension in English, in which the contribution of decoding and listening comprehension varies as a function of the level of the readers.
• Orthographic transparency and other unique characteristics of the languages studied might influence reading comprehension in these languages

What does this paper add?

• Arabic is a diglossic language that is characterised by relatively unique orthographic and morphological features for which the validity of the simple view of reading (SVR) has not been tested.
• The basic components of the SVR (decoding and listening comprehension) have explained between 56% and 38% of the variance in reading comprehension in children from the first to the sixth grade.
• Decoding, as one of the basic components of the SVR, failed to contribute to reading comprehension when orthography and morphology were considered.

Implications for practice and/or policy

• This large‐scale cross‐sectional study is the first of its type to assess reading comprehension in Arabic.
• The study justifies the necessity to assess the suitability of the SVR in languages with very specific linguistic characteristics such as Arabic.
• The results emphasise the necessity of considering the complex orthography and the rich morphology of Arabic for improving teaching, assessment and intervention.

     

Czech students and mitigation of global warming: beliefs and willingness to take action

Abstract

The future life-styles and pro-environmental behaviour of today’s younger students will be a cardinal factor in mitigating the severity of projected climate change. In this study, Czech students at upper-primary and secondary-school levels responded to a set of covertly paired statements designed to assess their beliefs concerning the usefulness of actions that might ameliorate global warming and the degree to which they are willing to act. Relations between their beliefs and willingness to act were assessed by means of an index of Potential Effectiveness of Education (PEE). The results show that Czech students are generally sceptical about the usefulness of the actions suggested and are among the less willing, in a wider international context, to participate in actual processes that might ameliorate global warming. However, Czech secondary-school students, particularly females, are significantly more willing to act than upper-primary students. Although relatively high PEE values were observed, Czech students tend to underestimate the role of personal consumption and male students in particular are not willing to take actions that involve no immediate personal benefit. Our results thus emphasize the importance of adjusting school curricula by promoting insight into the topic of global warming, and extending that understanding into practical measures.     

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.