A set of psychological experiments was conducted to explore the effects of stimulus structure on visual search processes. Results of the experiments, in which subjects searched for target stimuli among numerous other stimuli that served as distractors in stimulus displays, provide clear indications of interactive effects on visual search time of stimulus structure and the structure of the viewi...

The structural and electronic/optical properties of pure and Ag-N-codoped (8,0) ZnO nanotubes have been studied using first-principles calculations in the framework of the local spin density approximation. The configurations for Zn atoms replaced by Ag atoms are p-type semiconductor materials, and the bandgap increases when N atoms are doped into ZnO nanotube configurations. The optical studies...

Flexible flapping wings have garnered a large amount of attention within the micro aerial vehicle (MAV) community: a critical component of MAV flight is the coupling of aerodynamics and structural dynamics. This paper presents a computational framework for simulating shell-like wing structures flapping in incompressible flow at low Reynolds numbers in both hover and forward flight. The framewor...

The present study explored constraints on mid-fusiform activation during object discrimination. In three experiments, participants performed a matching task on simple line configurations, nameable objects, three dimensional (3-D) shapes, and colors. Significant bilateral mid-fusiform activation emerged when participants matched objects and 3-D shapes, as compared to when they matched two-dimens...

We present a first-principles study of the structural, electronic, and optical properties of hydrogenated amorphous silicon (a-Si:H). To this end, atomic configurations of a-Si:H with 72 and 576 atoms respectively are generated using molecular dynamics. Density functional theory calculations are then applied to these configurations to obtain the electronic wave functions. These are analyzed and...

Simulation is a useful tool for engineering systems, and it is used in numerous and diverse fields. Simulation of large systems can result in better designs and make the design process more efficient. One important use of simulation lies in comparing and choosing the best among different simulation models that represent competing or alternative designs before the actual deployment and implement...