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2015

Modeling

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Articles 1 - 11 of 11

Full-Text Articles in Engineering

Robust Modeling And Predictions Of Greenhouse Gas Fluxes From Forest And Wetland Ecosystems, Khandker S. Ishtiaq Nov 2015

Robust Modeling And Predictions Of Greenhouse Gas Fluxes From Forest And Wetland Ecosystems, Khandker S. Ishtiaq

FIU Electronic Theses and Dissertations

The land-atmospheric exchanges of carbon dioxide (CO2) and methane (CH4) are major drivers of global warming and climatic changes. The greenhouse gas (GHG) fluxes indicate the dynamics and potential storage of carbon in terrestrial and wetland ecosystems. Appropriate modeling and prediction tools can provide a quantitative understanding and valuable insights into the ecosystem carbon dynamics, while aiding the development of engineering and management strategies to limit emissions of GHGs and enhance carbon sequestration. This dissertation focuses on the development of data-analytics tools and engineering models by employing a range of empirical and semi-mechanistic approaches to robustly …

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Thermodynamics Of Migration In Polymers: Can Contamination From Materials In Contact Be Predicted, Controlled And Possibly Avoided?, Olivier Vitrac, Phuong Nguyen Oct 2015

Thermodynamics Of Migration In Polymers: Can Contamination From Materials In Contact Be Predicted, Controlled And Possibly Avoided?, Olivier Vitrac, Phuong Nguyen

Single-Use Technologies: Bridging Polymer Science to Biotechnology Applications

The contamination from materials is coined as “migration” and refers to a combination of various mass transfer mechanisms under thermodynamic control: molecular or mutual diffusion, sorption and desorption phenomena linear with concentration or not. The contamination pathways are particularly complicated when they involve several components or steps and strong interactions between materials and the medium in contact. They have been studied and mathematically described with two possible purposes: i) simplified approaches with a goal of overestimating the real contamination and ii) more sophisticated approaches to optimize the design of polymer materials, packaging materials or to redesign plastic additives with lower …

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In Need Of A Domain-Specific Language Modeling Notation For Smartphone Applications With Portable Capability, Hamza Ghandorh, Luiz Fernando Capretz Dr., Ali Bou Nassif Dr. Aug 2015

In Need Of A Domain-Specific Language Modeling Notation For Smartphone Applications With Portable Capability, Hamza Ghandorh, Luiz Fernando Capretz Dr., Ali Bou Nassif Dr.

Electrical and Computer Engineering Publications

The rapid growth of the smartphone market and its increasing revenue has motivated developers to target multiple platforms. Market leaders, such as Apple, Google, and Microsoft, develop their smartphone applications complying with their platform specifications. The specification of each platform makes a platform-dedicated application incompatible with other platforms due to the diversity of operating systems, programming languages, and design patterns. Conventional development methodologies are applied to smartphone applications, yet they perform less well. Smartphone applications have unique hardware and software requirements. All previous factors push smartphone developers to build less sophisticated and low-quality products when targeting multiple smartphone platforms. Model-driven …

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Interdisciplinary Modeling For Water-Related Issues Graduate Course, Laurel Saito, Alexander Fernald, Timothy Link Jul 2015

Interdisciplinary Modeling For Water-Related Issues Graduate Course, Laurel Saito, Alexander Fernald, Timothy Link

All ECSTATIC Materials

The science and management of aquatic ecosystems is inherently interdisciplinary, with issues associated with hydrology, atmospheric science, water quality, geochemistry, sociology, economics, environmental science, and ecology. Addressing water resources issues in any one discipline invariably involves effects that concern other disciplines, and attempts to address one issue often have consequences that exacerbate existing issues or concerns, or create new ones (Jørgensen et al. 1992; Lackey et al. 1975; Straskraba 1994) due to the strongly interactive nature of key processes (Christensen et al. 1996). Thus, research and management of aquatic ecosystems must be interdisciplinary to be most effective, but such truly …

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Modeling Secondary Particle Tracks Generated By High-Energy Protons In Water, Francisco Blanco, Antonio Munoz, Diego T. Almeida, F. Ferreira Da Silva, Paulo Limao-Vieira, Alexey Verkhovtsev, L Ellis-Gibbings, K Krupa, A Traore, G Garcia Jan 2015

Modeling Secondary Particle Tracks Generated By High-Energy Protons In Water, Francisco Blanco, Antonio Munoz, Diego T. Almeida, F. Ferreira Da Silva, Paulo Limao-Vieira, Alexey Verkhovtsev, L Ellis-Gibbings, K Krupa, A Traore, G Garcia

Faculty of Engineering and Information Sciences - Papers: Part A

We present interaction probability data of low-energy secondary electrons and positrons produced due to the proton impact. The probability distribution functions serve as input data for the Low Energy Particle Track Simulation (LEPTS) approach which allows one to include the effect of low-energy species in medical applications of radiation and in ion-beam cancer therapy, in particular.

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On The Question Of Effective Sample Size In Network Modeling: An Asymptotic Inquiry, Pavel N. Krivitsky, Eric D. Kolaczyk Jan 2015

On The Question Of Effective Sample Size In Network Modeling: An Asymptotic Inquiry, Pavel N. Krivitsky, Eric D. Kolaczyk

Faculty of Engineering and Information Sciences - Papers: Part A

The modeling and analysis of networks and network data has seen an explosion of interest in recent years and represents an exciting direction for potential growth in statistics. Despite the already substantial amount of work done in this area to date by researchers from various disciplines, however, there remain many questions of a decidedly foundational nature - natural analogues of standard questions already posed and addressed in more classical areas of statistics - that have yet to even be posed, much less addressed. Here we raise and consider one such question in connection with network modeling. Specifically, we ask, "Given …

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Long-Term Functionality Of Rural Water Services In Developing Countries: A System Dynamics Approach To Understanding The Dynamic Interaction Of Causal Factors, Jeffrey P. Walters, Amy N. Javernick-Will Jan 2015

Long-Term Functionality Of Rural Water Services In Developing Countries: A System Dynamics Approach To Understanding The Dynamic Interaction Of Causal Factors, Jeffrey P. Walters, Amy N. Javernick-Will

Faculty Publications - Biomedical, Mechanical, and Civil Engineering

Research has shown that sustainability of rural water infrastructure in developing countries is largely affected by the dynamic and systemic interactions of technical, social, financial, institutional, and environmental factors that can lead to premature water system failure. This research employs systems dynamic modeling, which uses feedback mechanisms to understand how these factors interact dynamically to influence long-term rural water system functionality. To do this, the research first identified and aggregated key factors from literature, then asked water sector experts to indicate the polarity and strength between factors through Delphi and cross impact survey questionnaires, and finally used system dynamics modeling …

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Full Field Reservoir Modeling Of Shale Assets Using Advanced Data-Driven Analytics, Soodabeh Esmaili, Shahab D. Mohaghegh Jan 2015

Full Field Reservoir Modeling Of Shale Assets Using Advanced Data-Driven Analytics, Soodabeh Esmaili, Shahab D. Mohaghegh

Faculty & Staff Scholarship

Hydrocarbon production from shale has attracted much attention in the recent years. When applied to this prolific and hydrocarbon rich resource plays, our understanding of the complexities of the flow mechanism (sorption process and flow behavior in complex fracture systems - induced or natural) leaves much to be desired. In this paper, we present and discuss a novel approach to modeling, history matching of hydrocarbon production from a Marcellus shale asset in southwestern Pennsylvania using advanced data mining, pattern recognition and machine learning technologies. In this new approach instead of imposing our understanding of the flow mechanism, the impact of …

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Modeling And Current Control Strategy For A Medium-Voltage Cascaded Multilevel Statcom With Lcl Filter, Xuehua Zhao, Liping Shi, Libing Chen, Zhenglong Xia, A R. Bendre Jan 2015

Modeling And Current Control Strategy For A Medium-Voltage Cascaded Multilevel Statcom With Lcl Filter, Xuehua Zhao, Liping Shi, Libing Chen, Zhenglong Xia, A R. Bendre

Faculty of Engineering and Information Sciences - Papers: Part A

The Static Synchronous Compensator (STATCOM a.k.a. SVG) is widely used to regulate dynamic reactive power and to solve dynamic voltage stability problems. Modeling shows that a cascaded STATCOM, which is composed of several cascaded H-bridges, not only has strong coupling characteristics when an LCL filter is added but it is also a non-linear, multivariable system. Therefore, its practical design and application are difficult to mplement. In this paper an internal decoupling control algorithm is introduced to provide independent control of the active and reactive currents. Decoupling control algorithms are proposed, and models and simulation of the decoupling are provided. We …

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Modeling Minimum Transport Boundary For Fluidized Dense-Phase Pneumatic Conveying Systems, G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W. Wypych Jan 2015

Modeling Minimum Transport Boundary For Fluidized Dense-Phase Pneumatic Conveying Systems, G Setia, Soumya Suddha Mallick, Renhu Pan, Peter W. Wypych

Faculty of Engineering and Information Sciences - Papers: Part A

For the reliable design of fluidized dense-phase pneumatic conveying systems, it is of paramount importance to accurately estimate blockage conditions or the minimum transport boundary. Existing empirical models for the fluidized dense-phase conveying of fine powders are either based on a limited number of products and pipelines or have not been tested for their accuracy and stability over a wide range of scale-up conditions. In this paper, based on the test results of 22 different powders conveyed through 38 pipelines, a unified model for the minimum transport boundary has been developed that represents gas Froude number as a function of …

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An Efficient Background Modeling Approach Based On Vehicle Detection, Jia-Yan Wang, Limei Song, Jiangtao Xi, Qinghua Guo Jan 2015

An Efficient Background Modeling Approach Based On Vehicle Detection, Jia-Yan Wang, Limei Song, Jiangtao Xi, Qinghua Guo

Faculty of Engineering and Information Sciences - Papers: Part A

The existing Gaussian Mixture Model(GMM) which is widely used in vehicle detection suffers inefficiency in detecting foreground image during the model phase, because it needs quite a long time to blend the shadows in the background. In order to overcome this problem, an improved method is proposed in this paper. First of all, each frame is divided into several areas(A, B, C and D), Where area A, B, C and D are decided by the frequency and the scale of the vehicle access. For each area, different new learning rate including weight, mean and variance is applied to accelerate the …

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