584 research outputs found

    The dimension of a formal language

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    A connection is established between formal language theory and mathematical analysis by associating the symbols of strings of a language with the digits of expansions of points in the unit interval. A language is made to correspond to a particular subset of the unit interval, and the dimension of a language is defined as the Hausdorff dimension of this subset. It is shown that the dimension of a language is less than or equal to its channel capacity, and it is shown that a statement involving the dimension of a language can be added to a list of criteria developed by Brainerd and Knode (1972) for determining that a language is not recognizable by a finite automaton

    Baldcypress Restoration in a Saltwater Damaged Area of South Carolina

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    Baldcypress (Taxodium distichum (L.) Rich.) seed was collected in 1992 from nine different estuarine areas in the southeastern United States (Winyah Bay, SC, Ogeechee and Altmaha Rivers in GA, Loftin Creek, FL, Ochlockonee River FL, Mobile Bay, AL, West Pearl River, LA, Bayou LaBranche, LA, and Lake Chicot, LA) and planted in Clemson University\u27s Hobcaw nursery in the spring of 1993. Germination ranged from a low of 16 percent for seed from FL to 58 percent for seed from NC. Seedlings were grown in the nursery for two growing seasons, lifted, and planted in an area killed by saltwater introduced by Hurricane Hugo\u27s (1989) storm surge. Half of the seedlings were protected with tree shelters. Seedlings averaged 122 cm tall upon planting. Survival after 6 years was 99 percent. Height growth of seedlings in tree shelters was significantly higher than those not in tree shelters for each year except during year 3. Among the seed sources, seedlings from the Loftin Creek, FL source have shown greatest growth, with and without protection, for all growing seasons except the first year. After 6 years, average height of tree-shelter protected seedlings was 393 cm while the average height of non-protected seedlings was 281 cm. Tree-shelters increased early growth of seedlings, but once they emerged from the tree-shelter, growth differences between shelter and no-shelter treatments decreased and seems to be more related to the degree of deer herbivory experienced by unprotected seedlings

    The Ecology of Barataria Basin, Louisiana: An Estuarine Profile

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    Southern Deepwater Swamps

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    The Problem of Planting Louisiana Swamplands when Nutria (Myocastor Coypu) are Present

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    Logging of baldcypress (Taxodium distichum) in the swamps of the southeastern United States is once again becoming common and an area of particular concern in Louisiana is the regeneration of cypress in its natural environment. One way to ensure the proper stocking of cypress is to plant seedlings, but nutria usually damage or destroy newly planted seedlings and are a deterrent to cypress regeneration in flooded areas. In 1985 cypress seedlings were planted in a flooded logged area and in an area where flooding was preventing the establishment of natural seedlings. Nutria destroyed 86% of the seedlings in the Barataria watershed (logged area) and 100% in the Lake Verret watershed. One-half of the Barataria seedlings were protected with Vexar seedling protectors, but these were no deterrent to nutria. A second planting was made in the Lake Verret basin and the seedlings surrounded by chicken wire fencing. Nutria did no damage to the protected seedlings. A third planting was made in the Lake Verret area in September 1985 to determine if nutria would destroy late planted seedlings. Once again no nutria damage was observed. Implications are that spring-planted seedlings need protection to allow them to establish a root system making them more difficult for the nutria to pull up. Fall-planted seedlings appear to be less susceptible to damage because of the abundant food supply provided by aquatic plants that grow during the summer and fall. Once firmly established, cypress seedlings are less susceptible to nutria damage
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