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Dartmouth, MA, United States

Savaria D.T.,Naval Undersea Warfare Center | Balasubramanian R.,UMass Dartmouth
IEEE International Conference on Multisensor Fusion and Integration for Intelligent Systems | Year: 2010

Simultaneous localization and map building (SLAM) is a desired feature for autonomous mobile robots. This SLAM approach allows the robot to create a map on the fly and then backtrack to further explore the area without human interaction. Data from the robot's encoder and sonar sensors are used along with depth information from a stereo camera vision system to explore and map the surroundings. The Speeded Up Robust Features algorithm (SURF) is used to visually identify landmarks in the environment. © 2010 IEEE.

Salvucci M.V.,Deprtment of Mechanical Engineering | Rice J.M.,Deprtment of Mechanical Engineering | Kim Y.K.,UMass Dartmouth
Fiber Society Spring 2014 Technical Conference: Fibers for Progress | Year: 2014

Carbon laminar composites have advantages of very high specific strength and modulus over metal alloys. However their through-thickness thermal conductivity (TTC) is the same order of matrix resin used (∼ 0.2 W/m°K). We report significant approximately 450 % improvement in TTC of carbon composites by flocking short Z-axis carbon fiber together with a conductive interfacial boundary layer of modified matrix resin system.

Oudenhoven T.A.,University of Wisconsin - Stevens Point | Walder B.J.,Ohio State University | Golen J.A.,UMass Dartmouth | Rheingold A.L.,MC 0332 | Dacchioli J.S.,University of Wisconsin - Stevens Point
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title molecule, [Ru(C9H7)(C7H 5O)(CO)2], the dihedral angle between the mean plane of the indene ring system and the phenyl ring is 86.28 (8)°. The crystal structure is stabilized by weak intermolecular C-H⋯O and C-H⋯π(arene) interactions. The Ru-5-cyclopentadienyl centroid bond length is 1.946 (11) Å.

Connor R.C.,UMass Dartmouth
Philosophical Transactions of the Royal Society B: Biological Sciences | Year: 2010

Players in Axelrod and Hamilton's model of cooperation were not only in a Prisoner's Dilemma, but by definition, they were also trapped in a dyad. But animals are rarely so restricted and even the option to interact with third parties allows individuals to escape from the Prisoner's Dilemma into a much more interesting and varied world of cooperation, from the apparently rare 'parcelling' to the widespread phenomenon of market effects. Our understanding of by-product mutualism, pseudo-reciprocity and the snowdrift game is also enriched by thinking 'beyond the dyad'. The concepts of by-product mutualism and pseudo-reciprocity force us to think again about our basic definitions of cooperative behaviour (behaviour by a single individual) and cooperation (the outcome of an interaction between two or more individuals). Reciprocity is surprisingly rare outside of humans, even among large-brained 'intelligent' birds and mammals. Are humans unique in having extensive cooperative interactions among non-kin and an integrated cognitive system for mediating reciprocity? Perhaps, but our best chance for finding a similar phenomenon may be in delphinids, which also live in large societies with extensive cooperative interactions among non-relatives. A system of nested male alliances in bottlenose dolphins illustrates the potential and difficulties of finding a complex system of cooperation close to our own. © 2010 The Royal Society.

Connor R.C.,UMass Dartmouth | Watson-Capps J.J.,University of Colorado at Boulder | Sherwin W.B.,University of New South Wales | Krutzen M.,University of Zurich
Biology Letters | Year: 2011

Male bottlenose dolphins in Shark Bay, Western Australia form two levels of alliances; two to three males cooperate to herd individual females and teams of greater than three males compete with other groups for females. Previous observation suggested two alliance tactics: small four to six member teams of relatives that formed stable pairs or trios and unrelated males in a large 14-member second-order alliance that had labile trio formation. Here, we present evidence for a third level of alliance formation, a continuum of second-order alliance sizes and no relationship between first-order alliance stability and second-order alliance size. These findings challenge the 'two alliance tactics' hypothesis and add to the evidence that Shark Bay male bottlenose dolphins engage in alliance formation that likely places considerable demands on their social cognition. © 2011 The Royal Society.

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