188 research outputs found
Modeling Disaster: The Failure of Management of the New England Groundfish Industry
Most of the worlds' marine fisheries are overexploited or endangered, including the New England groundfishery, once one of the world’s most prolific. After 35 years of management, stock sizes and catches are lower now than ever. We argue that New England groundfishermen are caught in a prisoner’s dilemma, from which they have failed to escape. We then suggest a set of policies to get these groudnfishermen out of their dilemma.Fishermen's dilemma, fishery management, New England fisheries
Public Access to Privately Owned Land in Maine
In Maine, people have long used private land for recreation. James Acheson points out that this “open land” tradition—unique in the nation—has huge economic implications, especially for the state’s tourism industry. In recent years, there has been a substantial increase in land posting, largely in response to abuses by the public. Although a number of different kinds of institutions have arisen to allow continued public access to private land, Acheson suggests that more needs to be done if Maine’s “open land” tradition is to be maintaine
Opposing and following responses in sensorimotor speech control : why responses go both ways
When talking, speakers continuously monitor and use the auditory feedback of their own voice to control and inform speech production processes. When speakers are provided with auditory feedback that is perturbed in real time, most of them compensate for this by opposing the feedback perturbation. But some speakers follow the perturbation. In the current study, we investigated whether the state of the speech production system at perturbation onset may determine what type of response (opposing or following) is given. The results suggest that whether a perturbation-related response is opposing or following depends on ongoing fluctuations of the production system: It initially responds by doing the opposite of what it was doing. This effect and the non-trivial proportion of following responses suggest that current production models are inadequate: They need to account for why responses to unexpected sensory feedback depend on the production-system’s state at the time of perturbation
Book Reviews
Reviews of the following books: Lobstering and The Maine Coast by Kenneth R. Martin and Nathan R. Lipfert; Beothuk Bark Canoes: An Analysis and Comparative Study by Ingeborg C.L. Marshall; Records of Meduncook Plantation and Friendship Maine, 1763-1899 edited by Melville B. Cook
Explorations, Vol. 5, No. 2
Articles include:
Cover: Brian McLain of New Harbor, measuring a V-notched lobster; slide taken by Robert C. Bayer, University of Maine Professor of Animal and Veterinary Sciences.
April is Aquaculture Month Guest Editorial, by Kathleen Lignell
Hospital Project Teams: Gaining Cooperation, by Mary Beth Pinto
The Maine Lobster Institute: Science and Industry Working Together, by Susan White
The Theory of Common Property Resources: Scientific Law or Myth? by James M. Acheson
What do Seedless Watermelons and Triploid Oysters have in Common? by Mary Lee
Technology and the Competitive Edge, by John Field and Eric Beenfeldt
Growing our State Tree Faster: Fertilizing White Pine, by Robert Shepard and M.W. Blumenstoc
Book reviews
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44493/1/10745_2005_Article_BF01557918.pd
Presupernova Evolution of Rotating Massive Stars I: Numerical Method and Evolution of the Internal Stellar Structure
The evolution of rotating stars with zero-age main sequence (ZAMS) masses in
the range 8 to 25 M_sun is followed through all stages of stable evolution. The
initial angular momentum is chosen such that the star's equatorial rotational
velocity on the ZAMS ranges from zero to ~ 70 % of break-up. Redistribution of
angular momentum and chemical species are then followed as a consequence of
rotationally induced circulation and instablities. The effects of the
centrifugal force on the stellar structure are included. Uncertain mixing
efficiencies are gauged by observations. We find, as noted in previous work,
that rotation increases the helium core masses and enriches the stellar
envelopes with products of hydrogen burning. We determine, for the first time,
the angular momentum distribution in typical presupernova stars along with
their detailed chemical structure. Angular momentum loss due to (non-magnetic)
stellar winds and the redistribution of angular momentum during core hydrogen
burning are of crucial importance for the specific angular momentum of the
core. Neglecting magnetic fields, we find angular momentum transport from the
core to the envelope to be unimportant after core helium burning. We obtain
specific angular momenta for the iron core and overlaying material of
1E16...1E17 erg s. These values are insensitive to the initial angular
momentum. They are small enough to avoid triaxial deformations of the iron core
before it collapses, but could lead to neutron stars which rotate close to
break-up. They are also in the range required for the collapsar model of
gamma-ray bursts. The apparent discrepancy with the measured rotation rates of
young pulsars is discussed.Comment: 62 pages, including 7 tables and 19 figures. Accepted by Ap
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