Embodiment, process, and product in ensemble expression

To what extent do musicians need to have a common idea about the music in order to give a coherent, joint performance? An expressive performance is traditionally seen as generated from a cognitive representation of music, which predicts that a shared musical idea should be central. An embodied and enactive perspective on performance, in contrast, emphasizes the emergent and externalized character of performance, as “togetherness” is achieved in the sounds, movements, and material performed. Reconsidering cognitive processes from an embodied perspective challenges us to find new ways to measure and conceptualize ensemble performance. This includes how we measure musical coordination as something that is achieved not between pairs of individuals, but in relation to the joint sonic output. It also includes how we conceive of expression and aesthetics in performance contexts, as an emergent product that is the outcome of embodied processes and ways of interacting.

Post-Crack Flexural and Joint Performance Behaviors of Fiber-Reinforced Concrete for Pavements

This study investigated the influence of fiber properties on the post-crack flexural and joint performance behaviors of fiber-reinforced concrete (FRC) for thin concrete overlays. The study included a literature review, an online survey, and laboratory testing. It was found that the majority (almost 93%) of the FRC overlays in the United States of America were constructed with synthetic macro fibers. In the laboratory study, a total of 46 different FRC mixes were prepared with 11 different types of fibers. Fiber dosage, stiffness, and geometry significantly influenced the residual strength ratio (RSR) and residual strength (RS). In general, stiffer fibers with geometry like embossed, twisted, and crimped shapes showed higher post-crack flexural strength on average than the low-stiffness straight synthetic fibers. From the joint performance testing, it was found that fibers can improve the load transfer efficiency (LTE). A nomogram was developed so that agencies can select fiber dosage and type based on the target values of RSR, RS, and/or LTE.

Materials Approach to Improving Asphalt Pavement Longitudinal Joint Performance

Many states are looking for methods to improve longitudinal joint performance of their asphalt pavements, since these joints often fail before the rest of the surface. With their inherently lower density, longitudinal joints fail by cracking, raveling, and potholing because of the intrusion of air and water. Because of their longitudinal joint issues, and after trying several less-than-successful traditional solutions, Illinois Department of Transportation (IDOT) developed a concept to seal the longitudinal joint region, but from the bottom up. Test sections were constructed in 2001 through 2003 to determine how a newly developed material, called longitudinal joint sealant (LJS), would improve joint performance. LJS is a highly polymer-modified asphalt cement with fillers and is placed at the location of a longitudinal joint before paving. As mix is paved over it, the LJS melts and migrates up into voids in the low-density mix, making the mix impermeable to moisture while sealing the longitudinal joint itself. The IDOT test pavements were evaluated after 12 years and found to have longitudinal joints that exhibited significantly better performance than the control joint sections and were in similar or better condition than the rest of the pavement. Laboratory testing of cores showed decreased permeability and increased crack resistance of mix near joints with LJS as compared with similar mix without LJS. The life extension of the joint area is approximately 3–5 years, and the benefit is calculated to be three to five times the initial cost.

A Comparison of Auditory and Visual Representations of System Confidence to Support Trust Specificity, Attention Management, and Joint Performance in Human-Machine Teams

Breakdowns in human-robot teaming can result from trust miscalibration, i.e., a poor mapping of trust to a system’s capabilities, resulting in misuse or disuse of the technology. Trust miscalibration also negatively affects operators’ top-down attention allocation and monitoring of the system. This experiment assessed the efficacy of visual and auditory representations of a system’s confidence in its own abilities for supporting trust specificity, attention management and joint performance in the context of a UAV-supported target detection task. In contrast to earlier studies, neither visual nor auditory confidence information improved detection accuracy. Visual representations of confidence led to slower response times than auditory representations, likely due to resource competition with the visual target detection task. Finally, slower response times were observed when a UAV incorrectly detected a target. Results from this study can inform the design of visual and auditory representations of system confidence in human-machine teams with high attention demands.