Colloidal nanocrystals attract significant interest due to their potential applications in electronic, magnetic, and optical devices. Nanocrystal supercrystals (NCSCs) are particularly appealing for their well ordered structure and homogeneity. The interactions between organic ligands that passivate the inorganic nanocrystal cores critically influence their self-organization into supercrystals, By investigating the mechanical properties of supercrystals, we can directly characterize the particle-particle interactions in a well-defined geometry, and gain insight into both the self-assembly process and the potential applications of nanocrystal supercrystals. Here we report nanoindentation studies of well ordered lead-sulfide (Pbs) nanocrystal supercrystals. Their modulus and hardness were found to be similar to soft polymers at 1.7 GPa and 70 MPa respectively and the fractures toughness was 39 KPa/m1/2, revealing the extremely brittle nature of these materials.

This report summarizes PATH ATMIS research for fiscal year 1999/2000. In each of the brief project descriptions we state the objectives of the project and outline its status and some of its principal results. These descriptions are not intended to be comprehensive or complete, but rather to present a picture of the main thrusts of each of the reported projects. References are provided in the end of the report for more detailed information about particular projects. Taken together, the collection of project descriptions should give the reader an overview of the entire ATMIS research program. In general we have described only projects which are completed or have produced specific results and reports, and thus a number of projects in progress are not cited. The report is organized into the following research topics: Data Collection Systems, Traffic Management Systems, Traveler Information Systems, Public Transportation Systems, Decision Support

This research aims to study contextual memory under different emotional stimuli. Participants were asked to watch films on mute. These films were pre-categorized as different emotions(happy, neutral, arousing, negative, and sexual). At the same time, they were presented with neutral words on an mp3 player auditorily. In the end, they were asked to recall as many words as possible. The words recalled were then matched with the scenes it belonged to and calculated for statistical significance. An ANOVA revealed statistical significance across films, most significantly when comparing negative to neutral films, and negative to sexual films. This suggests sexual stimulus can enhance memory performance.

This report presents a summary of California PATH Advanced Traffic Management and Traffic Information Systems (ATMIS) and Systems research for FY 1997-1998. For each project, a brief description is given of the objectives, status outline, and principal results. The report is organized into the following research topics: Surveillance Systems, Traffic Management Systems, Traffic Modeling, Traveler Information Systems, Public Transportation Systems, and System Integration and Benefit/Cost Analysis.

This report summarizes PATH ATMIS and Systems research for fiscal year 1998/1999. In each of the brief project descriptions we state the objectives of the project and outline its status and some of its principal results. These descriptions are not intended to be comprehensive or complete, but rather to present a picture of the main thrusts of each of the reported projects. References are provided in the end of the report for more detailed information about particular projects. Taken together, the collection of project descriptions should also give a reader an overview of the entire program. In general we have described only projects which are completed or have produced specific results and reports, and thus a number of projects in progress are not cited. The report is organized into the following research topics: Surveillance Systems, Traffic Management Systems, Traveler Information Systems, Public Transportation Systems, Decision Support