Search

Abstract: We are developing a multimedia encyclopedia that provides a framework for students to leam nuclear science. A variety of media formats are used to present concepts, including text, static figures, animations, and video. Two special prsentation formats use dynamically produced simulations to expose students to nuclear science relationships. These media types provide greater interactivity and flexibility than simple animations. Students access information through tutorials, a dictionary of nuclear science terms, biographies of notable scientists, and a timeline of nuclear science history. The tutorial organization emphasizes the interrelationships among topics. We present an overview of the encyclopedia.

Abstract: We are developing electronic laboratories to help introduce students to nuclear science. An electronic laboratory is a collection of computer simulations of nuclear science experiments. Each program allows students to set experimental parameters, collect data, and analyze results. Experiments can easily be repeated because the computer can compress time. Electronic laboratories are useful for schools with existing nuclear science programs because they can prepare students for actual laboratory work. They are also useful for schools without specialized facilities, since they give students an empirical understanding of nuclear science but do not require specialized equipment. We present three electronic experiments.

•A prototype of a flat cell of a ZEBRA battery has been developed and extensively tested at CNR ITAE.•FEM analysis has been carried out using the software COMSOL MULTIPHYSICS to guarantee low thermal losses and optimal warm up time.•Development of the chemistry of the cathode by the combination of the two main redox pairs Ni/NiCl2 and Fe/FeCl2 with Fe sulphides,•New cell validated considering charge/discharge cycles aimed at determining capacity, duration, efficiency, energy density.•The performances in terms of efficiency are: 76% energy efficiency; 84% faradic efficiency

Ptand Pt–Fecatalysts supported on multiwalled carbon nanotubes (MWCNTs) were prepared by impregnation and reduction at intermediate temperature (400°C). The MWCNTs with diameters ranging from 20 to 100nmwere synthesized by a spray pyrolysis technique. Pt∕MWCNTsand Pt–Fe/MWCNT catalysts were characterized by X-ray diffraction, X-ray fluorescence, scanning electron microscope—energy dispersive X-ray analysis, and transmission electron microscopy techniques. The electrocatalytic behavior for the oxygen reduction reaction was investigated in rotating disk electrode configuration in an acidic medium, also in the presence of various methanol concentrations (0.01, 0.1, and 1M). An anodic shift of the peak potential for methanol oxidation of ∼150mVwas observed in the presence of 1Mmethanol concentration for the Pt–Fecatalyst compared to the Ptcatalyst. Both materials were used as cathodes in a direct methanol fuel cell at 30 and 60°C. A better performance was obtained for the cell based on Pt–Fe/MCWNTs as cathode catalyst. Although slight iron dissolution was observed after two weeks of discontinuous operation, the performance of the Pt–Fecatalyst was larger than the Ptcatalyst.