Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 112 for “"box model"”.
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Thermohaline circulation stability : a box model
… and coupled versions of an inter-hemispheric 3-box model of Thermohaline Circulation (THC) is presented. The model consists of a northern high latitudes box, a tropical box, and a southern high latitudes box, which respectively can be thought as corresponding to the northern, tropical and …
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Scalable black-box model explainability through low-dimensional visualizations
… visual intuitive explanations for how black-box models work. The first is a projection pursuit-based method that seeks to provide data-point specific explanations. The second is a generalized additive model approach that seeks to explain the model on a more holistic level, enabling users to …
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Thermohaline circulation stability in a copuled land-ocean-atmosphere box model
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.
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Development and analysis of a simple grey-box model of central sleep apnea
… thesis, we develop and analyze a simple grey-box model that describes the pathophysiology of central sleep apnea (CSA). We construct our model following a thorough survey of published approaches. Special attention is given to PNEUMA, a complex, comprehensive model of human respiratory and …
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The Interstellar Transport of Galactic Cosmic Rays
… their primary progenitors are used to test the models of the transport of cosmic rays in the Galaxy. Two principal models were tested: the simple leaky-box model and the nested leaky-box model. In the simple leaky-box model, cosmic rays accelerated at their sources are transported uniformly …
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Modeling, identification, and application of multilayer polypyrrole conducting polymer actuators
… actuators to develop low-order lumped parameter models of actuator electrical, mechanical, and electromechanical behavior. Experimental data were processed using system identification techniques. Both grey box and black box models were identified. The grey box model consisted of a first order …
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Continental outflow of polluted air from the US to the North Atlantic and mercury chemical cycling in various atmospheric environments
… were studied by simulations using a chemical box model and data analysis of NASA DC-8 flights during the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites field campaign. A chemical box model was developed considering only gaseous reactions of mercury, …
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Self sustained thermohaline oscillations and their implications for biogeochemical cycles
An ocean general circulation model (OGCM) configured with a paleo ocean bathymetry such as late Permian shows that different modes of ocean circulation might exist in warm climate: a strong 'thermal mode' induced by cooling at high latitudes and a weak 'haline mode' induced by evaporation at …
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Joint compensation of I/Q impairments and PA nonlinearity in mobile broadband wireless transmitters
… output (MIMO) wireless transmitters, a novel two-box model is proposed for eliminating those effects. The model is realised by implementing two phases which provide an optimisation of the identification of any system. Another improvement is the capability of higher performance of the system …
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Dynamics of buoyant releases in confined spaces.
… work has generally been based on the 'filling-box' model (Baines & Turner 1969). This model, however, may only be applied when the source has little or no initial momentum, is in a container with a height/width aspect ratio less than unity and does not interact with the side boundaries. In this …
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Prediction interval modeling using Gaussian process quantile regression
… prediction intervals for a generic black-box point forecast model is presented. The prediction intervals are learned from the forecasts of the black-box model and the actual realizations of the forecasted variable by using quantile regression on the observed prediction error distribution, …
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Steam and Condensate System Control in Paper Making
… water volume in the original stock to the head box, this is the part of the paper machine that, by far, consumes most energy. Studies have shown that the dryer section uses around 2/3 of the total energy requirement in paper making. This implies that the dryer section is the most expensive part …
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Laboratory measurements and modeling of trace atmospheric species
… exper- imentation, field measurements, and modeling. The results presented here focus on spectroscopic and kinetic laboratory measurements and photochemical box modeling. Laboratory experiments were conducted using IntraCavity Laser Absorption Spectroscopy (ICLAS), a high-resolution, high …
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An inverse modeling approach to investigate deep ocean ventilation from radiocarbon records
… paleo-Δ14C data for the past 40 kyrs with a 16-box model of the world ocean (except the Arctic Ocean) to address two key questions: (1) To what extent can the paleo-Δ14C data be explained by atmospheric Δ14C variations when deep ventilation rates are fixed to modern ocean estimates? and (2) To …
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Decoupling of iron and phosphate in the global ocean
… of ocean circulation and biogeochemistry models. I formulate a mechanistic model of iron cycling which includes scavenging onto sinking particles and complexation with an organic ligand. The iron cycle is coupled to a model of the phosphorus cycle. The aeolian source of iron is prescribed. …
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Understanding the CO₂cycle in the North Pacific Ocean using inverse box models
… air-sea exchanges of fresh water. The inverse box model was applied to data generated from the Hamburg LSGOC-biogeochemical model. For this data, the mixing transports of the tracers were important for closing the tracer budgets. Applying the inverse box model to the temperature, salinity, …
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Accounting for unpredictable spatial variability in plankton ecosystem models
… distort parameter estimates when the ecosystem model<br/>is fitted to (or assimilates) ocean data, may compromise model validation, and may produce<br/>mean-field ecosystem behaviour discrepant with that predicted by the model. New statistical<br/>methods are investigated to mitigate these …
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STUDYING PRODUCT REVIEWS USING SENTIMENT ANALYSIS BASED ON INTERPRETABLE MACHINE LEARNING
… analysis, we consider the use of both glass-box (rule-based) and black-box opaque (BERT) models. We find that while the black-box model is more correlated with product ratings, there are interesting counterexamples where the sentiment analysis results by the glass-box model are better aligned …
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Coastal urban atmospheric mercury cycling and emissions in Boston, MA
… point sources was discernible in the data. A one box model was developed to represent the physical processes controlling Hg0 concentrations in Boston in order to replicate concentrations, capture the difference in concentrations from land and ocean sources, and estimate both anthropogenic and …
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The Oceanography and Modelling of the Pontevedra Ria (NW Spain)
… hydrography, biogeochemistiy and biogeochemical modelling, has been performed. The hydrographical variability of the Pontevedra Ria was dependent on freshwater inputs and upwelling of nutrient-rich East North Atlantic Central Water from the shelf. Intrusions of the Poleward Current were also …
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