Experimental Investigation of the Impact of Linear and Nonlinear Information Presentation on Problem Solving

This study investigates the match of technology (iii this case, mode of information presentation) to problem task and the relative importance of each to problem-solving performance. XI: this research, this was achieved by matching information presentation (linear and nonlinear) to problem tasks (spatial and symbolic). The specific focus is on problem-solving performanceinrelationtolinearandnonlinearinformationpresentationandaccess. Italsoexamineswhichcombinationof problem task type arid information presentation yield the best problem-solving performance

Evolution of threading dislocations in passivated thin film.

Crystalline films grown epitaxially on substrate consisting of different crystalline material are of considerable interest in optoelectronic devices and the semiconductor industry. The film and substrate have in general different lattice parameters. This lattice mismatch affects the quality of interfaces and can lead to the formation of very high densities of misfit dislocations at the interface. Here we study the strengthening of a thin film on a substrate. In particular we consider the motion of a single dislocation gliding on its slip plane within the film and its interaction with multiple obstacles and external stress is calculated and the motion in response is determined. It is assumed that the passivation layer and the substrate to be of infinite strength compared to the metallic thin film. A phase field theory of dislocations for the evolution of single threading dislocation is used and simulated using 2D Fast Fourier Transform. This theory accounts for the interactions between the dislocations and an applied stress and between the dislocations lines and obstacles. The results obtained show a relation between the thin film thickness and the critical stress needed to move the threading dislocation. As the film thickness decreases it is observed that the yield stress increases in agreement with the experiments. The evolution of threading dislocations in a passivated metallic thin film is simulated and it shows that as the dislocation travels within the thin film region, it leaves a misfit dislocation at the interfaces of the thin film on the substrate covered with the passivation layer. The effect of various obstacles placed in the path of the evolution of the single threading dislocation in a metallic thin film is also determined. It is observed from the results that the presence of the obstacles impedes the motion of the threading dislocations

Multimedia in the Year 2000: How will it Affect Our Lives?

The current computer buzzword is multimedia.. This technology includes the combination of interactive video and audio on compact disc that utilize optical storage technology. This includes sound, still image, motion video, and animation, or any combination of these. These have created an inexpensive way to distribute large volumes of data-like encyclopedias, volumes of reference manuals, etc. This paper will discuss the technology chances related to multimedia and explains how it may affect at, life In the coming decade