Robust synchronization of a class of chaotic networks

This paper studies synchronization of a dynamical complex network consisting of nodes being generalized Lorenz chaotic systems and connections created with transmitted synchronizing signals. The focus is on the robustness of the network synchronization with respect to its topology. The robustness is analyzed theoretically for the case of two nodes with two-sided (bidirectional) connections, and numerically for various cases with large numbers of nodes. It is shown that, unless a certain minimal coherent topology is present in the network, synchronization is always preserved. While for a minimal network where synchronization is global, the resulting synchrony reduces to semi-global if redundant connections are added.     

Student background factors influencing student achievement in Serbia

This paper describes student‐level findings of the first large‐scale comprehensive school effectiveness study of the primary education in Serbia. Twenty‐five student‐level variables were examined in a three‐level HLM model using a study sample of almost 5000 students, over 250 classrooms and over 100 schools. Differences between the students were in large part responsible for differences in achievement scores in mathematics and Serbian language. Parental education, Roma minority status, developmental or family problems, gender, student motivation, parental involvement in student work and homework were some of the factors associated with student achievement. Serbian policy‐makers are alerted to possible actions in order to improve mathematics and Serbian language achievement.     

What is the students’ interest in biology after the biology curriculum modification?

Decreasing interest in Science among students, confirmed by several investigations, calls for the need to revise the contents of the curricula for Science subjects, including Biology. Modern Biology curricula should not only contain key biological concepts but also provide a teacher with sufficient space to develop students’ competencies of scientific work and positive attitudes to Science. When preparing the curriculum, it is necessary to consider also students’ interest in selected curriculum topics and their benefit for everyday life. The objective of our research was to identify whether the performed transformation of the Biology curriculum for elementary schools increased the students’ interest in Biology and the contents thereof. We were also investigating students’ preferences in their interest in Biology topics and their interest in selected teaching methods and approaches. Our research confirmed the positive interest in Biology among majority of students who prefer direct, active participation in the process of knowledge acquisition through the study and exploration of living organisms as well as by the execution and assessment of practicals and experiments.     

Science, the public, and social elites: how the general public, scientists, top politicians and managers perceive science

This paper finds that the Croatian public's and the social elites' perceptions of science are a mixture of scientific and technological optimism, of the tendency to absolve science of social responsibility, of skepticism about the social effects of science, and of cognitive optimism and skepticism. However, perceptions differ significantly according to the different social roles and the wider value system of the observed groups. The survey data show some key similarities, as well as certain specificities in the configuration of the types of views of the four groups--the public, scientists, politicians and managers. The results suggest that the well-known typology of the four cultures reveals some of the ideologies of the key actors of scientific and technological policy. The greatest social, primarily educational and socio-spatial, differentiation of the perceptions of science was found in the general public.