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Articles 31 - 60 of 98
Full-Text Articles in Engineering
State Of The Art And Practice (Soap), Multiple Authors
State Of The Art And Practice (Soap), Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Recent Experience On Design, Construction And Performance Of Cfrd Dams, Camilo Marulanda Escobar, Alberto Marulanda Posada
Recent Experience On Design, Construction And Performance Of Cfrd Dams, Camilo Marulanda Escobar, Alberto Marulanda Posada
International Conference on Case Histories in Geotechnical Engineering
The inherent features of concrete face rockfill dams and the trend of building higher dams have been recently questioned by three recent incidents where major dams have experienced significant cracking in the central portion of the dam after the first filling. The incidents include the dams of Mohale in South Africa, and Barra Grande and Campos Novos in Brazil, the last one being the highest dam of its type built in the world. The design and development of CFRD dams, have been based primarily on precedent and empiricism, however, these recent incidents have shown that the extrapolation of precedent with …
Table Of Contents, Multiple Authors
Table Of Contents, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
General Report — Session 8: Projects Of Washington, District Of Columbia, Maryland And Virginia Forensic Geotechnical Engineering Health Monitoring And Retrofit Of Infrastructure, Sissy Nikolaou, Mary Perlea
General Report — Session 8: Projects Of Washington, District Of Columbia, Maryland And Virginia Forensic Geotechnical Engineering Health Monitoring And Retrofit Of Infrastructure, Sissy Nikolaou, Mary Perlea
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
General Report — Session 9: Case Histories Of Offshore Geotechnics, Gareth M. Swift
General Report — Session 9: Case Histories Of Offshore Geotechnics, Gareth M. Swift
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
General Report — Session 11: Application Of Case Histories In Education And Practice, Sanjeev Kumar
General Report — Session 11: Application Of Case Histories In Education And Practice, Sanjeev Kumar
International Conference on Case Histories in Geotechnical Engineering
Geotechnical engineers frequently use information about subsurface conditions from other projects in the area to design new projects in the vicinity. However, this information is used more in a surfacial manner rather than an integral part of project design. This session on application of case histories in education and practice has been introduced for the first time in this conference to initiate formalization of the use case histories in engineering design and training of civil engineering students. This report summarizes the papers submitted by various civil engineering educators and professional practitioners. The readers are encouraged to review the complete papers …
Laboratory Investigation On The Behaviour Of Improved Organic Soil Of Khulna Region, M. A. Mahamud, M. Alamgir, M. J. Hossain
Laboratory Investigation On The Behaviour Of Improved Organic Soil Of Khulna Region, M. A. Mahamud, M. Alamgir, M. J. Hossain
International Conference on Case Histories in Geotechnical Engineering
The conventional foundation systems are not suitable for the massive structures in Khulna region i.e. South-west part of Bangladesh because an organic soil layer exists at a depth 10ft to 25ft from the existing ground surface. The existence of organic soil layer in the deposits results excessive settlement due to its high compressibility and low shear strength. To overcome the problem, soil improvement techniques are usually adopted depending upon the type of constructions. It is necessary to know the degree of improvement for the different improved grounds prior to the selection of ground improvement techniques. So a laboratory investigation was …
Preface, Shamsher Prakash
Preface, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Conference Schedule, Multiple Authors
Conference Schedule, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Seismic Microzonation Studies In The City Of Ragusa (Italy), Salvatore Grasso, Lauretta Spina, Michele Maugeri
Seismic Microzonation Studies In The City Of Ragusa (Italy), Salvatore Grasso, Lauretta Spina, Michele Maugeri
International Conference on Case Histories in Geotechnical Engineering
The geotechnical zonation of the subsoil of the city of Ragusa suggests a high vulnerability of the physical environment added to site amplification of the ground motion phenomena. These elements concur on the definition of the Seismic Geotechnical Hazard of the city of Ragusa that should be correctly evaluated, through geo-settled seismic microzoning maps. Based on the seismic history of Ragusa, the following scenario events have been considered: the “Val di Noto” earthquake of January 11, 1693 (M=7.3), the “Etna” earthquake of March 1, 1818 (M=5.9), the 1895 earthquake (IMAX= 7 EMS), the Modica earthquake of January 23, …
Comparison Of Adaptive Critic-Based And Classical Wide-Area Controllers For Power Systems, Swakshar Ray, Ganesh K. Venayagamoorthy, Balarko Chaudhuri, Rajat Majumder
Comparison Of Adaptive Critic-Based And Classical Wide-Area Controllers For Power Systems, Swakshar Ray, Ganesh K. Venayagamoorthy, Balarko Chaudhuri, Rajat Majumder
Electrical and Computer Engineering Faculty Research & Creative Works
An adaptive critic design (ACD)-based damping controller is developed for a thyristor-controlled series capacitor (TCSC) installed in a power system with multiple poorly damped interarea modes. The performance of this ACD computational intelligence-based method is compared with two classical techniques, which are observer-based state-feedback (SF) control and linear matrix inequality $hbox{LMI-H}^{infty}$ robust control. Remote measurements are used as feedback signals to the wide-area damping controller for modulating the compensation of the TCSC. The classical methods use a linearized model of the system whereas the ACD method is purely measurement-based, leading to a nonlinear controller with fixed parameters. A comparative analysis …
Microkinetic Model Of Fischer-Tropsch Synthesis On Iron Catalysts, Uchenna Prince Paul
Microkinetic Model Of Fischer-Tropsch Synthesis On Iron Catalysts, Uchenna Prince Paul
Theses and Dissertations
Fischer-Tropsch synthesis (FTS), developed in the early 1900's, is defined as the catalytic conversion of H2 and CO to hydrocarbons and oxygenates with the production of H2O and CO2. Accurate microkinetic modeling can in principle provide insights into catalyst design and the role of promoters. This work focused on gaining an understanding of the chemistry of the kinetically relevant steps in FTS on Fe catalyst and developing a microkinetic model that describes FTS reaction kinetics. Stable Al2O3-supported/promoted (20% Fe, 1% K, 1% Pt) and unsupported Fe (99% Fe, 1% Al2O3) catalysts were prepared and characterized. Transient experiments including temperature programmed …
Flight Physician - July, 2008, Civil Aviation Medical Association
Flight Physician - July, 2008, Civil Aviation Medical Association
Browse all Civil Aviation Medical Association Newsletters
A sixteen page newsletter of the Civil Aviation Medical Association. The newsletter provided news about civil aviation medicine and information related to the organization.
A Computational Approach To Optimal Damping Controller Design For A Gcsc, Swakshar Ray, Ganesh K. Venayagamoorthy, Edson H. Watanabe
A Computational Approach To Optimal Damping Controller Design For A Gcsc, Swakshar Ray, Ganesh K. Venayagamoorthy, Edson H. Watanabe
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a computational approach for an offline measurement-based design of an optimal damping controller using adaptive critics for a new type of flexible ac transmission system device-the gate-controlled series capacitor (GCSC). Remote measurements are provided to the controller to damp out system modes. The optimal controller is developed based on the heuristic dynamic programming (HDP) approach. Three multilayer-perceptron neural networks are used in the design-the identifier/model network to identify the dynamics of the power system, the critic network to evaluate the performance of the damping controller, and the controller network to provide optimal damping. This measurement-based technique provides …
Nsf Career: Scalable Learning And Adaptation With Intelligent Techniques And Neural Networks For Reconfiguration And Survivability Of Complex Systems, Ganesh K. Venayagamoorthy
Nsf Career: Scalable Learning And Adaptation With Intelligent Techniques And Neural Networks For Reconfiguration And Survivability Of Complex Systems, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
The NSF CAREER program is a premier program that emphasizes the importance the foundation places on the early development of academic careers solely dedicated to stimulating the discovery process in which the excitement of research enriched by inspired teaching and enthusiastic learning. This paper describes the research and education experiences gained by the principal investigator and his research collaborators and students as a result of a NSF CAREER proposal been awarded by the power, control and adaptive networks (PCAN) program of the electrical, communications and cyber systems division, effective June 1, 2004. In addition, suggestions on writing a winning NSF …
Multiple Reference Frame-Based Control Of Three-Phase Pwm Boost Rectifiers Under Unbalanced And Distorted Input Conditions, Peng Xiao, Keith Corzine, Ganesh K. Venayagamoorthy
Multiple Reference Frame-Based Control Of Three-Phase Pwm Boost Rectifiers Under Unbalanced And Distorted Input Conditions, Peng Xiao, Keith Corzine, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Many control algorithms and circuits for three-phase pulse width modulation active rectifiers have been proposed in the past decades. In most of the research, it is often assumed that the input voltages are balanced or contain only fundamental frequency components. In this paper, a selective harmonic compensation method is proposed based on an improved multiple reference frame algorithm, which decouples signals of different frequencies before reference frame transformation. This technique eliminates interactions between the fundamental-frequency positive-sequence components and harmonic and/or negative-sequence components in the input currents, so that fast and accurate regulation of harmonic and unbalanced currents can be achieved. …
A Dstatcom Controller Tuned By Particle Swarm Optimization For An Electric Ship Power System, Pinaki Mitra, Ganesh K. Venayagamoorthy
A Dstatcom Controller Tuned By Particle Swarm Optimization For An Electric Ship Power System, Pinaki Mitra, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
In an all-electric ship power system, the power quality problems mainly arise due to the pulsed loads, which cause the degradation of the overall system performance. The paper proposes the application of DSTATCOM to improve these power quality problems of an electric ship. DSTATCOM is a shunt compensation device, which regulates the bus voltage by injecting reactive power during the pulsed load operations. The control strategy of DSTATCOM plays an important role to meet the objectives. The paper proposes a controller design strategy which is based on particle swarm optimization (PSO). PSO, an algorithm that falls into swarm intelligence family, …
Trends Of Rainfall And Maize Productivity In Malawi, T Kimaro
Trends Of Rainfall And Maize Productivity In Malawi, T Kimaro
Tanzania Journal of Engineering and Technology (TJET)
Daily rainfall data between 1966 and 2005 across all Agricultural Development Areas (ADDs) in Malawi was investigated to determine changes in selected rainfall characteristics and their impact on Maize productivity. Rainfall indices analyzed included rainfall amounts (annual and seasonal), onset, cessation, dry spells and length of rainy season. Man Kendal’s trend test was applied to the time series of these indices to detect any trends in the time series. Water Requirement Satisfaction Index (WRSI) for maize crop was used to study the spatial-temporal variation of maize productivity and thus its linkage to rainfall. Definition of onset and cessation adopted from …
Sediment Yield Prediction In Tanzania: Case Study Of Dodoma District Catchments, Mathew Mulemgera
Sediment Yield Prediction In Tanzania: Case Study Of Dodoma District Catchments, Mathew Mulemgera
Tanzania Journal of Engineering and Technology (TJET)
Soil erosion and sedimentation is serious and is resulting in rapid sedimentation of streams and reservoirs in Tanzania. This makes sediment yield modeling important before undertaking water resources development projects, although it has so far not been done in the country. At present sediment yield prediction can be done using physically based models, empirical soil erosion and sediment yield models, and sediment rating curves. The physically based models contain numerous parameters that are difficult to measure or estimate, making them inappropriate in developing countries like Tanzania. The rating curves give rough estimates while the empirical sediment yield models need runoff …
Open Source Software In Health Information Systems: Opportunities And Challenges, Hashim Twaakyondo
Open Source Software In Health Information Systems: Opportunities And Challenges, Hashim Twaakyondo
Tanzania Journal of Engineering and Technology (TJET)
The paper presents results of a study seeking to identify constraining and motivating factors associated with the adoption and use of Free Open Source Software to computerise health Information Systems in a developing country. The study approach is interpretive research to case study with a triangulation of several qualitative data collection methods such as interviews, group discussions and document analysis. The findings indicate that using open source software has advantages and disadvantages. The advantages are low entry cost to adopting software, possibilities of software localization, avoiding being hostage of proprietary software and foster knowledge acquisition among software developers. The disadvantages …
Vaccine Development For Developing Countries – Regulatory Approach In The European Union, Manfred G. Haase
Vaccine Development For Developing Countries – Regulatory Approach In The European Union, Manfred G. Haase
Vaccine Technology II
No abstract provided.
Vaccine Technology Ii: Conference Program, Barry C. Buckland, John G. Auniņš, Paula Marques Alves, Kathrin U. Jansen
Vaccine Technology Ii: Conference Program, Barry C. Buckland, John G. Auniņš, Paula Marques Alves, Kathrin U. Jansen
Vaccine Technology II
No abstract provided.
Vaccine Technology Ii: Abstracts Of Oral Presentations, The Editors
Vaccine Technology Ii: Abstracts Of Oral Presentations, The Editors
Vaccine Technology II
No abstract provided.
Vaccine Technology Ii: Abstracts Of Poster Presentations, The Editors
Vaccine Technology Ii: Abstracts Of Poster Presentations, The Editors
Vaccine Technology II
No abstract provided.
Emerging Diseases, Zoonoses And Vaccines To Control Them, Paul-Pierre Pastoret
Emerging Diseases, Zoonoses And Vaccines To Control Them, Paul-Pierre Pastoret
Vaccine Technology II
No abstract provided.
Developing Vaccines For Neglected Diseases, Douglas Holtzman
Developing Vaccines For Neglected Diseases, Douglas Holtzman
Vaccine Technology II
No abstract provided.
A Survey Of Satellite Communications System Vulnerabilities, Jessica A. Steinberger
A Survey Of Satellite Communications System Vulnerabilities, Jessica A. Steinberger
Theses and Dissertations
The U.S. military’s increasing reliance on commercial and military communications satellites to enable widely-dispersed, mobile forces to communicate makes these space assets increasingly vulnerable to attack by adversaries. Attacks on these satellites could cause military communications to become unavailable at critical moments during a conflict. This research dissected a typical satellite communications system in order to provide an understanding of the possible attacker entry points into the system, to determine the vulnerabilities associated with each of these access points, and to analyze the possible impacts of these vulnerabilities to U.S. military operations. By understanding these vulnerabilities of U.S. communications satellite …
Fault Growth And Propagation During Incipient Continental Rifting: Insights From A Combined Aeromagnetic And Shuttle Radar Topography Mission Digital Elevation Model Investigation Of The Okavango Rift Zone, Northwest Botswana, Baraka D. Kinabo, John Patrick Hogan, Eliot A. Atekwana, Mohamed G. Abdel Salam, Motsoptse P. Modisi
Fault Growth And Propagation During Incipient Continental Rifting: Insights From A Combined Aeromagnetic And Shuttle Radar Topography Mission Digital Elevation Model Investigation Of The Okavango Rift Zone, Northwest Botswana, Baraka D. Kinabo, John Patrick Hogan, Eliot A. Atekwana, Mohamed G. Abdel Salam, Motsoptse P. Modisi
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Digital Elevation Models (DEM) extracted from the Shuttle Radar Topography Mission (SRTM) data and high-resolution aeromagnetic data are used to characterize the growth and propagation of faults associated with the early stages of continental extension in the Okavango Rift Zone (ORZ), northwest Botswana. Significant differences in the height of fault scarps and the throws across the faults in the basement indicate extended fault histories accompanied by sediment accumulation within the rift graben. Faults in the center of the rift either lack topographic expressions or are interpreted to have become inactive, or have large throws and small scarp heights indicating waning …
Evaluating Arkansas Roadway Intersection Accidents Using Traffic Safety Analysis Methods: Generalized Estimating Equations And Roadway Observation, Jacob Mercer
Industrial Engineering Undergraduate Honors Theses
Considerable research has been made in recent years to evaluate road traffic safety. This is especially true with the United States, whose international rank in public safety is rapidly declining. In 2004, Arkansas ranked as the third highest in traffic fatalities among all the states. These are striking numbers that reflect the lack of attention that the state has received in terms of evaluating road traffic safety. Historically, this safety is measure by one of two methods: Statistical analyses of historical data or hands-on, observational analyses of present safety conditions. Rarely in research are both methods used within the same …
Hydrologic Remote Sensing And Land Surface Data Assimilation, Hamid Moradkhani
Hydrologic Remote Sensing And Land Surface Data Assimilation, Hamid Moradkhani
Civil and Environmental Engineering Faculty Publications and Presentations
Accurate, reliable and skillful forecasting of key environmental variables such as soil moisture and snow are of paramount importance due to their strong influence on many water resources applications including flood control, agricultural production and effective water resources management which collectively control the behavior of the climate system. Soil moisture is a key state variable in land surface?atmosphere interactions affecting surface energy fluxes, runoff and the radiation balance. Snow processes also have a large influence on land-atmosphere energy exchanges due to snow high albedo, low thermal conductivity and considerable spatial and temporal variability resulting in the dramatic change on surface …