Presented here are the results of a systematic study of the viscoelastic properties of polyurea over broad ranges of strain rates and temperatures, including the high-pressure effects on the material response. Based on a set of experiments and a master curve developed by Knauss (W. for time–temperature equivalence, we have produced a model for the large… (More)
We propose a novel network-based approach for location estimation in social media that integrates evidence of the <i>social tie strength</i> between users for improved location estimation. Concretely, we propose a location estimator -- FriendlyLocation -- that leverages the relationship between the strength of the tie between a pair of users, and the… (More)
Incorporation of ceramics in hybrid armor systems has resulted in significant weight reductions. They are an excellent prospect for the next-generation energy absorbing systems for vehicular protection. In this paper, it is demonstrated that the ballistic efficiency of ceramic tiles can be vastly improved by judiciously restraining them with membranes of… (More)
In this paper, we investigate the interplay of distance and tie strength through an examination of 20 million geo-encoded tweets collected from Twitter and 6 million user profiles. Concretely, we investigate the relationship between the strength of the tie between a pair of users, and the distance between the pair. We identify several factors -- including… (More)
We present a resonant cantilever sensor for use in chemical and biological sensing applications. Electrostatically actuated suspended indium phosphide (InP) waveguides are used as the sensing cantilevers. This sensor uses an integrated optical detection scheme which eliminates the need for free space optical components seen in traditional systems.… (More)
CrowdTracker is a community-based web monitoring system optimized for real-time web streams like Twitter, Facebook, and Google Buzz. In this demo summary, we provide an overview of the system and architecture, and outline the demonstration plan.