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Effects of land clearing methods on a tropical forest ecosystem and the growth of Terminalia ivorensis (A. Chev.)Ngeh, Chiambeng Paulinus January 1989 (has links)
No description available.
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A geography of small-scale capture fishing and aquaculture in Limbon-Limbon and Pipindan, two fishing villages on Laguna de Bay, PhilippinesWebb, David January 1990 (has links)
No description available.
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Forecasting hurricane tracks using a complex adaptive systemLear, Matthew R. 06 1900 (has links)
Forecast hurricane tracks using a multi-model ensemble that is comprised by linearly combining the individual model forecasts have greatly reduced the average forecast errors when compared to individual dynamic model forecast errors. In this experiment, a complex adaptive system, the Tropical Agent Forecaster (TAF), is created to fashion a 'smart' ensemble forecast. The TAF uses autonomous agents to assess the historical performance of individual models and model combinations, called predictors, and weights them based on their average error compared to the best track information. Agents continually monitor themselves and determine which predictors, for the life of the storm, perform the best in terms of the distance between forecast and best-track positions. A TAF forecast is developed using a linear combination of the highest weighted predictors. When applied to the 2004 Atlantic hurricane season, the TAF system with a requirement to contain a minimum of three predictors, consistently outperformed, although not statistically significant, the CONU forecast at 72 and 96 hours for a homogeneous data set. At 120 hours, the TAF system significantly decreased the average forecast errors when compared to the CONU.
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A complex adaptive system approach to forecasting hurricane tracksLear, Matthew R. 06 1900 (has links)
, for the life of the storm, perform the best in terms of the distance between forecast and best-track positions. A TAF forecast is developed using a linear combination of the highest weighted predictors. When applied to the 2004 Atlantic hurricane season, the TAF system with a requirement to contain a minimum of three predictors, consistently outperformed, although not statistically significant, the CONU forecast at 72 and 96 hours for a homogeneous data set. At 120 hours, the TAF system significantly decreased the average forecast errors when compared to the CONU. The multi-agent (MAS) system approach opens the door for statistically significant forecast improvement. / US Navy (USN) author.
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Variability in global-scale circulations and their impacts on Atlantic tropical cyclone activityRosencrans, Matthew J. 06 1900 (has links)
evel relative vorticity, a decrease in westerly vertical wind shear, and increased convection in the West African monsoon (WAM). The second and third modes of an empirical orthogonal function (EOF) analysis of the 700-hPa height anomalies identify a distinct Rossby-wave pattern. Significant variability in the Southern Hemisphere mid-latitude circulations is related to the two EOF modes and to equatorward Rossby-wave dispersion. Formation of a large cyclonic anomaly over the southeast Pacific, west of Chile, is related to equatorward propagation of a Rossby-like wave across South America, toward the equatorial Atlantic. The cyclonic anomaly precedes an increase in WAM convection by an average of two days, which then precedes westerly wind anomalies over the equatorial North Atlantic by several days. Tropical cyclone formation is found to be enhanced when the increased equatorial westerly anomalies coincide with reduced vertical wind shear, which is related to Northern Hemisphere midlatitude circulations / US Air Force (USAF) author.
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Nile tilapia (Oreochromis niloticus) production in tropical microcosms fertilized with rabbit excretaFranco, Luis 27 September 1991 (has links)
This investigation explored the use of microcosms as a tool for
studying the dynamics of tropical aquaculture ponds. The potential use
of rabbit excreta as a pond fertilizer in integrated farming systems was
also investigated.
Twelve insulated fiber glass tanks were utilized as microcosms to
simulate earthen ponds. Seven hand-sexed Nile Tilapia O. niloticus)
were stocked per tank, and microcosm performance was observed for a 90-
day experimental period. Three rabbit excreta loading rates
corresponding to 50 and 75 kg/10,000 m³ /day, and a continuously adjusted
manure loading rate were assessed. The fertilizer treatments were
compared to a control treatment where fish were fed on a prepared food.
Water quality variables and fish performance were regularly monitored.
Nitrogen and phosphorous content of rabbit excreta were measured.
The dynamics of the microcosms were similar to warm water earthen
ponds with respect to physical and chemical characteristics.
Statistical differences were detected between control and fertilized
treatments in relation to dissolved oxygen levels, net primary
productivity, total alkalinity, total ammonia and orthophosphate levels.
Primary productivity was influenced more by light intensity and
penetration than by nutrient limitation. Rabbit excreta overloading was
observed in the 75 kg treatment. Fish growth was greatest in the
control treatment, but it was not statistically different from the
continuously adjusted fertilizer treatment (Pondclass) (0.0065 and
0.0056, respectively). Low daily fish gains were observed in the 50 and
75 kg treatments. Low dissolved oxygen and high total ammonia were
concentrations resulted in low weight gains and condition indices of
fish in the 50 and 75 kg treatments. Extrapolated fish yields
corresponded to 6,205, 4,563, 3,686, 4,869 kg/ha/year for control, 50
kg, 75 kg and Pondclass treatments, respectively. The observed yields
are comparable with field experiences in real ponds. The continuously
adjusted treatment showed the lowest manure conversion ratio (3.85) in
the fertilized treatments.
The nitrogen content of rabbit excreta varied according to rabbit
size, presence or absence of urine plus water waste, and food droppings.
Urine plus water waste provided 28 % of the total nitrogen content in
rabbit excreta, whereas food droppings provided 12 %. Rabbit urine may
play an important role in aquacultural systems because it contains a
large fraction of nitrogen in inorganic forms which are readily utilized
for algal growth. Other rabbit excreta characteristics such as buoyancy
may be advantageous in aquacultural systems. Rabbit excreta is a
potentially rich source of fertilizer for use in fish ponds. / Graduation date: 1992
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Understanding and forecasting interannual variability of tropical cyclone activity in the Western North Pacific Ocean張健緯, Cheung, Kin-wai. January 1998 (has links)
published_or_final_version / Geography and Geology / Master / Master of Philosophy
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Quantification of tropical cyclone steering江熾榮, Kong, Che-wing. January 1984 (has links)
published_or_final_version / Geography and Geology / Doctoral / Doctor of Philosophy
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Kinetic energy and momentum transport at 500 mb in the tropics.Alas, Jorge de las. January 1966 (has links)
Atmospheric kinetic energy calculations at 500 mb are carried out for the tropical region 20N to 20S on a daily basis during the month of September 1957. The basic data consist of grid point values of wind direction and speed obtained from streamline and isotach analyses of the tropical charts. [...]
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Prediction of the nutritive value of tropical forages from laboratory data.Ramlal, Harry. January 1973 (has links)
No description available.
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