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2010

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Articles 1561 - 1590 of 5375

Full-Text Articles in Engineering

Relative Importance Of Fire Resistance Performance Of Partition Walls, Ming-Chin Ho, Ming-Ju Tsai Jun 2010

Relative Importance Of Fire Resistance Performance Of Partition Walls, Ming-Chin Ho, Ming-Ju Tsai

Journal of Marine Science and Technology–Taiwan

The fire performance of partitions is influenced by the thickness, type, combustibility level of panel material, type of filling material and frame. However, realizing the importance of these parameters is not of enough help for interior designers. They need more quantitative information of the relative importance of the parameters so that they can select materials with cost consideration. Experiments were thus designed and analyzed by the Taguchi experimental design analysis method for it is good to determine the effect of each parameter especially as the number of parameters is large. Our data and analysis show that the thickness of panel …

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Probabilistic Assessment Of Seismic Drift Demands For Frame Structures In Near-Fault Regions, Jan Tysh-Shang, Lin Chiung-Yueh, Wu Chun-Wei Jun 2010

Probabilistic Assessment Of Seismic Drift Demands For Frame Structures In Near-Fault Regions, Jan Tysh-Shang, Lin Chiung-Yueh, Wu Chun-Wei

Journal of Marine Science and Technology–Taiwan

The purpose of this paper is to provide engineers with a rapid procedure to assess the maximum inter-story drift for generic moment-resisting frame (GMRF) structures in nearfault regions. In this procedure, the maximum inter-story drift demand of a structure can be evaluated by starting from the median value of elastic spectral displacement at the first period of the structure, and then amplifying it with some modification factors. Statistical parameters (medians and dispersions) of the distributions of these factors are obtained by performing linear, and nonlinear, dynamic simulations on codecompliant steel GMRF structures, to near-fault ground motions during Taiwan’s Chi-Chi earthquake …

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The Influence Of Broken Cables On The Structural Behavior Of Long-Span Cable-Stayed Bridges, Chin-Sheng Kao, Chang-Huan Kou Jun 2010

The Influence Of Broken Cables On The Structural Behavior Of Long-Span Cable-Stayed Bridges, Chin-Sheng Kao, Chang-Huan Kou

Journal of Marine Science and Technology–Taiwan

The influence of broken cables on the structural behavior of long-span cable-stayed bridges is examined considering all the nonlinear characteristics of a long-span cable-stayed bridge. The results show the influences of the broken cable on the structural behavior, such as the internal force, displacement, and the ultimate load-bearing capacity, are clear when an outside cable breaks. The results of the present study should assist in deciding when to replace cables in long-span cablestayed bridges.

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Direct Mapping Ovsf-Based Transmission Scheme For Underwater Acoustic Multimedia Communication, Chin-Feng Lin, Jiang-Yao Chen, Ya-Ju Yu, Jung-Ting Yan, Shung-Hyung Chang Jun 2010

Direct Mapping Ovsf-Based Transmission Scheme For Underwater Acoustic Multimedia Communication, Chin-Feng Lin, Jiang-Yao Chen, Ya-Ju Yu, Jung-Ting Yan, Shung-Hyung Chang

Journal of Marine Science and Technology–Taiwan

We would like to express our appreciation to the people that provided their help during this study. We also extend our appreciation to Dr. Chang-tai Shih, Visiting Professor of National Taiwan Ocean University from the Canadian Mu- seum of Nature, for his critical review and comments on the manuscript. This study was financially supported by a grant (NSC94-2313-B-019-018 and 94AS-14.1.1-FA-F1(16)) from the National Science Council of the Republic of China and the Fisheries Agency, Council of Agriculture, Taiwan, R.O.C.

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Genetic Algorithm-Based Chaos Clustering Approach For Nonlinear Optimization, Min-Yuan Cheng, Kuo-Yu Huang Jun 2010

Genetic Algorithm-Based Chaos Clustering Approach For Nonlinear Optimization, Min-Yuan Cheng, Kuo-Yu Huang

Journal of Marine Science and Technology–Taiwan

In this paper, a n-dimension convergence algorithm was employed to track the potential trend of evolution in traditional genetic algorithm (GA) by K-means clustering technique. And, chaotic algorithm was exploited to prevent the new approach from premature. By means of the proposed approach, not only the basic search capability was maintained but also the flexibility and efficiency of parametric modeling were improved. The main purpose of the paper is to demonstrate how the GA optimizer can be improved by incorporating a hybridization strategy. Experimental studies revealed that the hybrid chaotic approach with genetic algorithm (CGA) procedure could produce much more …

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Numerical Assessment Of A Space-Constrained Venting System With Multi-Chamber Plug Mufflers By Ga Method, Chiu Min-Chie, Chang Ying-Chun Jun 2010

Numerical Assessment Of A Space-Constrained Venting System With Multi-Chamber Plug Mufflers By Ga Method, Chiu Min-Chie, Chang Ying-Chun

Journal of Marine Science and Technology–Taiwan

Recently, research on new techniques of single-chamber plug silencers has been addressed. However, the assessment of a multi-chamber plug muffler’s optimal shape design within a constrained space as well as a pressure-drop limit which are mostly concerned with the necessity of operation and system venting in practical engineering work was rarely tackled. Therefore, this paper will not only analyze the sound transmission loss (STL) of a space-constrained multi-chamber plug muffler but also optimize the best design shape under a specified pressure drop. In this paper, the generalized decoupling technique and plane wave theory used to solve the coupled acoustical problem …

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Numerical Solutions Of Coastal Morphodynamic Evolution For Complex Topography, Chiang Yun-Chih, Hsiao Sung-Shan, Lin Ming-Chung Jun 2010

Numerical Solutions Of Coastal Morphodynamic Evolution For Complex Topography, Chiang Yun-Chih, Hsiao Sung-Shan, Lin Ming-Chung

Journal of Marine Science and Technology–Taiwan

Numerical modeling of coastal morphodynamic evolution is a powerful tool for the planning and design of coastal engineering. The coastal morphological modeling system is based on the sediment conservation law, which couples modules for waves, wave-driven currents, and sediment transport rates. The numerical scheme for the sediment conservation law and nonlinear coupling between these modules can lead to dispersions, diffusions, spurious oscillations and stability problems that are still not well developed. In this paper, the bedslope updating techniques, oscillation removal schemes, and 2-step, 3-time-level temporal discretization are employed to avoid oscillations and improve the stability of the coastal morphological model …

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Prediction Of Nonlinear System By Chaotic Modular, Wang Chin-Tsan, Chen Ji-Cong, Shaw Cheng-Kuang Jun 2010

Prediction Of Nonlinear System By Chaotic Modular, Wang Chin-Tsan, Chen Ji-Cong, Shaw Cheng-Kuang

Journal of Marine Science and Technology–Taiwan

Determining a suitable method of adequately predicting different nonlinear systems is necessary for instantaneous signal control. A chaotic modular found for realizing the prediction of signal control was applied to three different physical models: the Lorenz attractor, Chua’s circuit, and chaotic wake flow. Testing results from the three cases show that the behaviors of the nonlinear systems are predicted for instant signal control successfully. This evidence confirms that the chaotic module found by the authors is very useful for instant signal control and can be utilized as a tool for instantaneous prediction of nonlinear systems

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Laminar Flow Past An Oscillating Circular Cylinder In Cross Flow, Pham Anh-Hung, Lee Chang-Yeol, Seo Jang-Hoon, Chun Ho-Hwan, Kim Hee-Jung, Hyun-Sik Yoon, Dong-Woo Park, Il-Ryong Park Jun 2010

Laminar Flow Past An Oscillating Circular Cylinder In Cross Flow, Pham Anh-Hung, Lee Chang-Yeol, Seo Jang-Hoon, Chun Ho-Hwan, Kim Hee-Jung, Hyun-Sik Yoon, Dong-Woo Park, Il-Ryong Park

Journal of Marine Science and Technology–Taiwan

The present study numerically investigates the twodimensional laminar flow past a circular cylinder forced to oscillate transverse to the free-stream. The numerical simulations are performed at a various range of cylinder oscillation frequency ranged between 0.8 and 1.2 of the natural vortex shedding frequency, and the oscillation amplitude extended up to 50% of the cylinder diameter at one Reynolds number of 185 showing the typical two-dimensional vortex shedding. The immersed boundary method is used to handle the oscillating cylinder in a rectangular grid system using the finite volume method. The primary vortex shedding frequency has the same value with the …

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Navigation On A Great Ellipse, Tseng Wei-Kuo, Lee Hsuan-Shih Jun 2010

Navigation On A Great Ellipse, Tseng Wei-Kuo, Lee Hsuan-Shih

Journal of Marine Science and Technology–Taiwan

This paper presents contact formulae for the computation of the position, the distance, and the azimuth along a great ellipse. The proposed alternative formulae are to be primarily used for accurate sailing calculations on the ellipsoid in a GIS environment as in ECDIS and other ECS. Among the ECDIS Requirements is the need for a continuous system with a degree of accuracy consistent with the requirements of safe navigation. At present, this requirement is best fulfilled by the Global Positioning System (GPS). The GPS system is referenced to World Geodetic System 1984 (WGS 84) Datum. Using the ellipsoid model for …

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Revisited To The Relationship Between The Free And Total Chloride Diffusivity In Concrete, Ming-Te Liang, Ran Huang, Hao-Yuan Jheng Jun 2010

Revisited To The Relationship Between The Free And Total Chloride Diffusivity In Concrete, Ming-Te Liang, Ran Huang, Hao-Yuan Jheng

Journal of Marine Science and Technology–Taiwan

The main purpose of this paper is provided the theoretical elucidation and parameter investigation for the experimental results performed by Lu et al. [Relationship between the free and total chloride diffusivity in concrete, Cement and Concrete Research, 32(2) 323~326 (2002)]. The analytical solution of Fick’s second law of linear diffusion in a semi-infinite quasi-homogeneous and isotropic concrete with initial and boundary conditions is used to curve fitting the experimental results and to find the relevant parameters such as the total and free chloride concentrations and diffusivities. The total chloride diffusivity is 2.8 times the free one. It seems plausible to …

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Matlab Structural Analysis Code For String Wing Box Structure, Sean Brown Jun 2010

Matlab Structural Analysis Code For String Wing Box Structure, Sean Brown

Aerospace Engineering

This report outlines the method used for analysis of a wing box structure for the experimental “stringy” wing structure often used in light RC aircraft. This code is able to find the displacement of each joint, and the stress and forces in each member of the truss structure. It also has the features of load and structure visualization, Kevlar string removal, user-defined point and distributed loading functions, and user-defined failure criteria function. This method and resulting code is meant for use in the support of the Human Powered Helicopter project being undertaken by the Aerospace and Mechanical Engineering Department at …

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Computer Simulation Of A Biomass Gasification-Solid Oxide Fuel Cell Power System Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy Jun 2010

Computer Simulation Of A Biomass Gasification-Solid Oxide Fuel Cell Power System Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy

Articles

The operation and performance of a solid oxide fuel cell (SOFC) stack on biomass syn-gas from a biomass gasification combined heat and power (CHP) plant is investigated. The objective of this work is to develop a model of a biomass-SOFC system capable of predicting performance under diverse operating conditions. The tubular SOFC technology is selected. The SOFC stack model, equilibrium type based on Gibbs free energy minimisation, is developed using Aspen Plus. The model performs heat and mass balances and considers ohmic, activation and concentration losses for the voltage calculation. The model is validated against data available in the literature …

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Analysis Of A Passive Flow Control Device Via Flow Visualization Techniques, Cheryl R. Graham, Shi (Peter) Huang Jun 2010

Analysis Of A Passive Flow Control Device Via Flow Visualization Techniques, Cheryl R. Graham, Shi (Peter) Huang

Aerospace Engineering

This report details an experiment done to verify the effectiveness of a passive flow control system on a two-dimensional bluff body, blunt trailing edge model in controlling wake dimension and Karman vortex sheds. An earlier experiment by Park, et.al.[1] performed analysis via wind tunnel pressure testing and computerized model to determine the ideal proportions of such a tab design and identify the flow properties responsible for the potential drag reduction. To obtain visual verification of the existence of these concepts, a bluff body model proportionally identical to the one used by Park, et.al., was designed and tested in a water …

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Natural Fibers And Fiberglass: A Technical And Economic Comparison, Justin Andrew Zsiros Jun 2010

Natural Fibers And Fiberglass: A Technical And Economic Comparison, Justin Andrew Zsiros

Theses and Dissertations

Natural fibers have received attention in recent years because of their minimal environmental impact, reasonably good properties, and low cost. There is a wide variety of natural fibers suitable for composite applications, the most common of which is flax. Flax has advantages in tensile strength, light weight, and low cost over other natural fibers. As with other natural and synthetic fibers, flax is used to reinforce both thermoset and thermoplastic matrices. When flax is used in thermoplastic matrices, polypropylene and polyethylene are the main resins used. Although at first glance flax may seem to be a cheaper alternative to fiberglass, …

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A Full-Range, Multi-Variable, Cfd-Based Methodology To Identify Abnormal Near-Wall Hemodynamics In A Stented Coronary Artery, Jonathan Murphy, Fergal Boyle Jun 2010

A Full-Range, Multi-Variable, Cfd-Based Methodology To Identify Abnormal Near-Wall Hemodynamics In A Stented Coronary Artery, Jonathan Murphy, Fergal Boyle

Articles

The benefit of coronary stent implantation is reduced by excessive intimal hyperplasia which re-narrows the artery and the prevention of which is still a primary concern for clinicians. Abnormal hemodynamics create non-physiological viscous stress on the artery wall, one of the root causes of intimal hyperplasia following stent implantation. A methodology to comprehensively evaluate the viscous stress on the artery wall following stent implantation would be useful to evaluate a stent’s hemodynamic performance. The proposed methodology employs 3D computational fluid dynamics, the variables wall shear stress (WSS), WSS gradient (WSSG), WSS angle gradient (WSSAG) and a statistical analysis to evaluate …

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Cell Culture Method And Apparatus For Mechanically Stimulating Cells, Seth W. Donahue Jun 2010

Cell Culture Method And Apparatus For Mechanically Stimulating Cells, Seth W. Donahue

Michigan Tech Patents

A cell culture assembly and a method for culturing cells that provide mechanical stimulation to cells. The cell culture assembly can include a flow chamber positioned in a fluid path and a support comprising cells positioned within the flow chamber to expose the cells to the fluid path. The cell culture assembly can further include a means for producing a steady flow of fluid in the fluid path, and a means for producing an oscillatory flow of fluid in the fluid path simultaneously with producing the steady flow of fluid in the fluid path to mechanically stimulate the cells. The …

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Numerical Analysis Of The Effectiveness Of Limited Width Gravel Backfills In Increasing Lateral Passive Resistance, Mo'oud Nasr Jun 2010

Numerical Analysis Of The Effectiveness Of Limited Width Gravel Backfills In Increasing Lateral Passive Resistance, Mo'oud Nasr

Theses and Dissertations

Two series of static full-scale lateral pile cap tests were conducted on pile caps with different aspect ratios, with full width (homogeneous) and limited width backfill conditions involving loose sand and dense gravel. The limited width backfills were constructed by placing a relatively narrow zone (3 to 6 ft (0.91 to 1.83 m)) of higher density gravel material adjacent to the cap with loose sand beyond the gravel zone. Test results indicated that large increases in lateral passive resistance could be expected for limited width backfills. The main focus of this study is to assess the contribution of plane strain …

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A Comparative Analysis Of Methods For Baseline Drift Removal In Preterm Infant Respiration Signals, Pallavi Ramnarain Jun 2010

A Comparative Analysis Of Methods For Baseline Drift Removal In Preterm Infant Respiration Signals, Pallavi Ramnarain

Theses and Dissertations

Breathing is a vital function intrinsic to the survival of any human being. In preterm infants it is an important indicator of maturation and feeding competency, which is a hallmark for hospital release. The recommended method of measurement of infant respiration is the use of thermistors. Accurate event detection within thermistor generated signals relies heavily upon effective noise reduction, specifically baseline drift removal. Baseline drift originates from several sensor-based factors, including thermistor placement within the sensor and in relation to the infant nares. This work compares four methods for baseline drift removal using the same event detection algorithm. The methods …

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Quantum Capacitance Extraction For Carbon Nanotube Interconnects, Vidur Parkash, Ashok K. Goel Jun 2010

Quantum Capacitance Extraction For Carbon Nanotube Interconnects, Vidur Parkash, Ashok K. Goel

Michigan Tech Publications, Part 1

Electrical transport in metallic carbon nanotubes, especially the ones with diameters of the order of a few nanometers can be best described using the Tomanaga Luttinger liquid (TL) model. Recently, the TL model has been used to create a convenient transmission line like phenomenological model for carbon nanotubes. In this paper, we have characterized metallic nanotubes based on that model, quantifying the quantum capacitances of individual metallic single walled carbon nanotubes and crystalline bundles of single walled tubes of different diameters. Our calculations show that the quantum capacitances for both individual tubes and the bundles show a weak dependence on …

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East Bay Energy Consortium Meeting Agenda, June 7, 2010, East Bay Energy Consortium Jun 2010

East Bay Energy Consortium Meeting Agenda, June 7, 2010, East Bay Energy Consortium

East Bay Energy Consortium Meeting Agenda

No abstract provided.

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Hardware Implementation Of Symbol Synchronization For Underwater Fsk, Ying Li, Xing Zhang, Bridget Benson, Ryan Kastner Jun 2010

Hardware Implementation Of Symbol Synchronization For Underwater Fsk, Ying Li, Xing Zhang, Bridget Benson, Ryan Kastner

Electrical Engineering

Symbol synchronization is a critical component in the design of an underwater acoustic modem. Without accurate symbol synchronization, higher bit error rates incur thus reducing the reliability and quality of service of the wireless network. This paper provides a practical description of the design choices and hardware implementation details required to build a compact and efficient symbol synchronizer suitable for a short-range, low-power underwater FSK acoustic modem. Experimental results show the design meets the timing requirements of the underwater modem and provides accurate synchronization while consuming only 0.240W power in a Spartan3 xc3s2000 FPGA.

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Channel Equalization Based On Data Reuse Lms Algorithm For Shallow Water Acoustic Communication, Feng Tong, Bridget Benson, Ying Li, Ryan Kastner Jun 2010

Channel Equalization Based On Data Reuse Lms Algorithm For Shallow Water Acoustic Communication, Feng Tong, Bridget Benson, Ying Li, Ryan Kastner

Electrical Engineering

In recent years, there has been increasing interest in the design of underwater acoustic modems for marine environmental monitoring, underwater structure inspection and sea bottom resource exploitation. As underwater acoustic channels pose difficulties such as multipath, time-space selectivity, frequency dependent noise, and Doppler shifts on transmission, research on adaptive equalizers play an important role in the design of underwater modems. This paper presents a data reuse least mean square (DR-LMS) algorithm to achieve equalization performance with low computational complexity to facilitate a practical hardware implementation. Experimental results obtained in physical shallow water channels demonstrate the effectiveness of the proposed method …

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A Multi-Objective Evaluation Of Pc Plants With Aqueous Amine Carbon Capture Systems, John Eslick Jun 2010

A Multi-Objective Evaluation Of Pc Plants With Aqueous Amine Carbon Capture Systems, John Eslick

CO2 Summit: Technology and Opportunity

No abstract provided.

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Lifecycle Energy Modeling - Input Into Upstream Design Process, Prasanth Chandrahasan Jun 2010

Lifecycle Energy Modeling - Input Into Upstream Design Process, Prasanth Chandrahasan

CO2 Summit: Technology and Opportunity

No abstract provided.

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Towards Sustainable Energy: Tailored Synthesis Of Carbon-Neutral Filler Materials During Carbon Mineral Sequestration, Ah-Hyung Alissa Park Jun 2010

Towards Sustainable Energy: Tailored Synthesis Of Carbon-Neutral Filler Materials During Carbon Mineral Sequestration, Ah-Hyung Alissa Park

CO2 Summit: Technology and Opportunity

No abstract provided.

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Net Energy And Greenhouse Gas Emissions Evaluation Of Biodiesel Derived From Microalgae, Liaw Y. Batan Jun 2010

Net Energy And Greenhouse Gas Emissions Evaluation Of Biodiesel Derived From Microalgae, Liaw Y. Batan

CO2 Summit: Technology and Opportunity

No abstract provided.

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Achieving Process Energy Efficiency Via Innovation, Greg Werba Jun 2010

Achieving Process Energy Efficiency Via Innovation, Greg Werba

CO2 Summit: Technology and Opportunity

No abstract provided.

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Unblocking Biofuels With Microchannel Technology, Jeff Mcdaniel Jun 2010

Unblocking Biofuels With Microchannel Technology, Jeff Mcdaniel

CO2 Summit: Technology and Opportunity

No abstract provided.

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Co2 Summit: Complete Conference Program, Frank Zhu Jun 2010

Co2 Summit: Complete Conference Program, Frank Zhu

CO2 Summit: Technology and Opportunity

Final Conference Program

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