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Articles 12871 - 12900 of 21751

Full-Text Articles in Engineering

Metrics And Models For Cost And Quality Of Component-Based Software, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul May 2003

Metrics And Models For Cost And Quality Of Component-Based Software, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul

Electrical and Computer Engineering Faculty Research & Creative Works

Quality and risk concerns currently limit the application of commercial off-the-shelf (COTS) software components to non-critical applications. Software metrics can quantify factors contributing to the overall quality of a component-based system, and models for tradeoffs between cost and various aspects of quality can guide quality and risk management by identifying and eliminating sources of risk. This paper discusses metrics and models that can be used to alleviate quality concerns for COTS-based systems, enabling the use of COTS components in a broader range of applications.

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Comparison Of Water And Saltwater Movement In Mortar Based On A Semi-Empirical Electromagnetic Model, Shanup Peer, R. Zoughi May 2003

Comparison Of Water And Saltwater Movement In Mortar Based On A Semi-Empirical Electromagnetic Model, Shanup Peer, R. Zoughi

Electrical and Computer Engineering Faculty Research & Creative Works

The presence of chloride ions in steel-reinforced structures leads to the corrosion of the reinforcement thus compromising the integrity and strength of the structure. Thus, it is of great importance to be able to non-destructively detect and evaluate the free chloride content in concrete. To that end, an investigation was initiated where two mortar cubes were soaked in distilled water and saltwater solutions, respectively. Their temporal microwave reflection properties were measured using open-ended rectangular waveguides on a daily basis for three cycles, each lasting 35 days. A semi-empirical electromagnetic model was then developed to simulate the reflection properties of the …

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Dc Power-Bus Noise Isolation With Power-Plane Segmentation, Wei Cui, Jun Fan, Yong Ren, Hao Shi, James L. Drewniak, Richard E. Dubroff May 2003

Dc Power-Bus Noise Isolation With Power-Plane Segmentation, Wei Cui, Jun Fan, Yong Ren, Hao Shi, James L. Drewniak, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

Power-plane segmentation is often used for DC power-bus noise isolation in multilayer printed circuit board (PCB) designs. To achieve a desirable noise isolation, different power-plane segmentations can be used. A suitable modeling approach, as well as measurements, were employed in this work to study the noise isolation with several power-plane segmentation designs. The geometries studied include power islands, and totally segmented power planes. The effects of the power-bus noise isolation with different types of power island connections, locations of segmentation, and shapes were analyzed, and compared. The modeled and measured results show that suitable power-plane segmentation can result in significant …

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Modeling Of The Fischer-Tropsch Synthesis In Slurry Bubble Column Reactors, Novica Rados, Muthanna H. Al-Dahhan, Milorad P. Dudukovic Apr 2003

Modeling Of The Fischer-Tropsch Synthesis In Slurry Bubble Column Reactors, Novica Rados, Muthanna H. Al-Dahhan, Milorad P. Dudukovic

Chemical and Biochemical Engineering Faculty Research & Creative Works

A Multicomponent One-Dimensional Dynamic Mathematical Model for the Reacting Slurry Systems with a Change in Gas Flow Rate Due to the Chemical Reaction is Developed. a Change in Gas Flow Rate Caused by the Chemical Reaction is Modeled using the overall Gas Mass Balance. Thus, All Relevant Chemical Species Are Included in the Model. Linear First-Order Reaction Kinetics is Considered. the Gas Phase is Modeled using the Two-Bubble Class Hydrodynamic Model. the Interaction between Small and Large Bubbles is Included as the Cross-Flow. Suspension of Liquid and Solids is Assumed to Form a Pseudo Slurry Phase. Back-Mixing in All of …

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Solvent And Method For Extraction Of Triglyceride Rich Oil, Shubhender Kapila, Paul Ki-Souk Nam, V. J. Flanigan Apr 2003

Solvent And Method For Extraction Of Triglyceride Rich Oil, Shubhender Kapila, Paul Ki-Souk Nam, V. J. Flanigan

Chemistry Faculty Research & Creative Works

The present invention relates to a solvent for use in extracting oil from an oil bearing material, such as soybeans, with the solvent resulting in the selective extraction of a triglyceride rich oil, which contains 95% or greater triglycerides and non-polar constituents, with the solvent comprised of a hydrocarbon, preferably hexane, and a fluorocarbon, so that the solvent has a viscosity less than 2.6 centipoise and a polarity of less than 0.1. The present invention also relates to a method of using the solvent to extract the triglyceride rich oil, with the method including preferably extracting the oil at a …

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Vertical Shear Wave Velocity Profiles Generated From Spectral Analysis Of Surface Waves: Field Examples, Neil Lennart Anderson, Genda Chen, Siasi Kociu, Ronaldo Luna, Thanop Thitimakorn, Alexi A. Malovichko, D. Malovichko, D. Shylakov Apr 2003

Vertical Shear Wave Velocity Profiles Generated From Spectral Analysis Of Surface Waves: Field Examples, Neil Lennart Anderson, Genda Chen, Siasi Kociu, Ronaldo Luna, Thanop Thitimakorn, Alexi A. Malovichko, D. Malovichko, D. Shylakov

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Surface wave (Rayleigh wave) seismic data were acquired at six separate bridge sites in southeast Missouri. Each acquired surface wave data set was processed (spectral analysis of surface waves; SASW) and transformed into a site-specific vertical shear-wave velocity profile (SASW shear-wave velocity profile). The SASW shear-wave velocity profiles generated for each bridge site were compared to other geotechnical data including seismic cone penetrometer shear-wave velocity profiles, cross-borehole shear-wave velocity profiles, and borehole lithology logs. The geotechnical data presented herein indicate the SASW shear-wave velocity profiles correlate well with subsurface lithology logs and available cross-borehole shear-wave velocity control. More specifically, clays, …

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Investigation Into The Ultrasound Setting Of Glass Ionomer Cements. Part I. Postulated Modalities, Mark R. Towler, C. M. Crowley, R. G. Hill Apr 2003

Investigation Into The Ultrasound Setting Of Glass Ionomer Cements. Part I. Postulated Modalities, Mark R. Towler, C. M. Crowley, R. G. Hill

Chemical and Biochemical Engineering Faculty Research & Creative Works

Fuji IX glass is a low phosphate, low soda containing glass which has strontia incorporated as a radio-pacifier. This glass material was analyzed during exposure to different durations of ultrasound in an attempt to determine how the glass phase reacts. Cross sections of Fuji IX cement, set both conventionally and by ultrasound, were subsequently compared by microscopy. The resultant data were analyzed in detail.

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Studies On The Use Of Carbon Waste Generated From Fertiliser Plant In Waste Water Treatment, Indra Deo Mall, Sanjay Tewari, Nripendra Singh Mar 2003

Studies On The Use Of Carbon Waste Generated From Fertiliser Plant In Waste Water Treatment, Indra Deo Mall, Sanjay Tewari, Nripendra Singh

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Carbon waste generated from fertiliser plant has been used for adsorption studies for the removal of chromium, zinc and nickel and COD from industrial effluent from phenol formaldehyde plant, polyester plant, sugar plant. Removal to the extent of 91.40, 86.8, 93.8 percent was achieved at the initial concentration of 10 mg/1 for Cr(VI), Ni(TI) and Zn(II) respectively using carbon waste as adsorbent Removal of these metals were found to be in order of Zn(II) > Cr(VI) > Ni(II). In a multi cationic solution containing these three metals, Cr(VI) adsorbed preferentially over Ni(II) and Zn(II). COD removal of 67.51%, and 86.4 % was …

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Utilisation Of Bagasse Fly Ash And Carbon Waste From Fertiliser Plant For Treatment Of Pyridine And 3-Picoline Bearing Wastewater, Indra Deo Mall, Sanjay Tewari, Nripendra Singh, Indra Mani Mishra Mar 2003

Utilisation Of Bagasse Fly Ash And Carbon Waste From Fertiliser Plant For Treatment Of Pyridine And 3-Picoline Bearing Wastewater, Indra Deo Mall, Sanjay Tewari, Nripendra Singh, Indra Mani Mishra

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The present work explores the possibility of utilizing sugarcane bagasse fly ash and carbon waste obtained from sugar mills and nitrogenous fertilizer plants, respectively for the removal of pyridine and 3-picoline from waste water. The adsorbing capacity of both adsorbents has been compared with that of activated carbon. Batch studies were conducted to see the effect of contact time, adsorbent dose, initial concentration and pH on the removal of pyridine and 3-picoline. Equilibrium data were fitted with Langmuir and Freundlich isotherms. Adsorptive capacities were found to be in the order: activated carbon > carbon waste > bagasse fly ash. Adsorption was found …

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Mass Transfer And Benzene Removal From Air Using Latex Rubber Tubing And A Hollow-Fiber Membrane Module, Mark W. Fitch, Jeffrey Neeman, Ellen England Mar 2003

Mass Transfer And Benzene Removal From Air Using Latex Rubber Tubing And A Hollow-Fiber Membrane Module, Mark W. Fitch, Jeffrey Neeman, Ellen England

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A Dense-Phase Latex Rubber Tube and a Polyporous Propylene Hollow-Fiber Membrane Module (HFMM) Were Investigated for Control of Benzene-Contaminated Gas Streams. the Abiotic Mass Flux Observed through the Latex Tube Was 3.9-13 Mg/(Min·m2) for 150 Ppm of Benzene at Various Gas and Liquid Flow Rates, While a 100-Fold Lower Mass Flux Was Observed in the HFMM. after Seeding with an Aromatic-Degrading Culture Enriched from Activated Sludge, the Observed Removal Was 80% of 150 Ppm, Corresponding to a Mass Flux of 45 Mg/(Min·m2). the Observed Mass Flux through the HFMM during Biofiltration Also Rose, to 0.4 Mg/(Min·m2). Because the HFMM Had …

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Cold-Formed Steel Top Load Bearing Tracks, Nahb Research Center, Inc. Mar 2003

Cold-Formed Steel Top Load Bearing Tracks, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Dynamics Of Adsorbed Poly(Methyl Acrylate) And Poly(Methyl Methacrylate) On Silica, Frank D. Blum, Wuu-Yung Lin, Crystal E. Porter Mar 2003

Dynamics Of Adsorbed Poly(Methyl Acrylate) And Poly(Methyl Methacrylate) On Silica, Frank D. Blum, Wuu-Yung Lin, Crystal E. Porter

Chemistry Faculty Research & Creative Works

Deuterium NMR and modulated differential scanning calorimetry (MDSC) were used to probe the behavior of ultrathin adsorbed poly(methyl acrylate) (PMA). The spectra for the bulk methyl-labeled PMA-d3 were consistent with the motions of the polymer segments being spatially homogeneous. For the polymers adsorbed on silica, multicomponent line shapes were observed. The segmental mobility of the surface polymers increased with increased adsorbed amounts. In contrast to the behavior of the polymers in bulk, the adsorbed lower-molecular-mass PMA-d3 was less mobile than the adsorbed high-molecular-mass polymer. The presence of a polymer overlayer was sufficient to suppress the enhanced mobility of the more-mobile …

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Electron Microscopy Studies On Platinum-Ceramics Nanocomposites Synthesized By Spray Process, X.-D. Zhou Feb 2003

Electron Microscopy Studies On Platinum-Ceramics Nanocomposites Synthesized By Spray Process, X.-D. Zhou

Materials Science and Engineering Faculty Research & Creative Works

The platinum-ceramics nanocomposites synthesized by spray process were discussed using electron microscopy. It was found that the nanocomposites of Pt-ceramics were synthesized by spray process with a controllable distribution of Pt primary particles. the analysis showed that the nanometer Pt primary particles encapsulating YSZ nanocomposites were derived when ethanol was used as solvent.

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Ccfss Technical Bulletin February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2003

Ccfss Technical Bulletin February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Ccfss News February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2003

Ccfss News February 2003, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

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Hybrid Wood And Steel Sole Plate Connection Walls To Floors Testing Report, Nahb Research Center, Inc. Feb 2003

Hybrid Wood And Steel Sole Plate Connection Walls To Floors Testing Report, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Testing Of Steel Single L-Headers, Nahb Research Center, Inc. Feb 2003

Testing Of Steel Single L-Headers, Nahb Research Center, Inc.

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Testing Of Steel Single L-Headers, Nahb Research Center Feb 2003

Testing Of Steel Single L-Headers, Nahb Research Center

CCFSS Library (1939 - present)

The purpose of this test report is to substantiate a more cost-competitive alternative to “box beam” and “back-to-back” headers by expanding upon the Lheader testing program that was previously conducted at the NAHB Research Center, Inc. Previous testing of double L-shaped headers indicated that these headers could be a viable alternative to the existing box-beam or back-to-back headers in lightly loaded applications. The higher capacity of the previously tested L-headers was mainly due to the fact that there is an added benefit from the top track that may be neglected in the design process. However, the application of these previous …

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Microwave Reflection And Dielectric Properties Of Mortar Subjected To Compression Force And Cyclically Exposed To Water And Sodium Chloride Solution, Shanup Peer, Joseph Toby Case, Eric Gallaher, K. E. Kurtis, R. Zoughi Feb 2003

Microwave Reflection And Dielectric Properties Of Mortar Subjected To Compression Force And Cyclically Exposed To Water And Sodium Chloride Solution, Shanup Peer, Joseph Toby Case, Eric Gallaher, K. E. Kurtis, R. Zoughi

Electrical and Computer Engineering Faculty Research & Creative Works

Corrosion of the reinforcing steel is a major cause of damage and deterioration in reinforced concrete structures such as concrete bridge decks and columns. Chloride intrusion into concrete can lead to depassivation of the steel and initiation of corrosion. Thus, it is very important to be able to nondestructively detect and evaluate the free chloride content in concrete. Near-field microwave nondestructive testing techniques, using open-ended rectangular waveguide probes, have shown great potential for evaluating various properties of concrete, including the successful detection of sodium chloride added to mortar mixing water. In this study, several mortar samples are cyclically soaked in …

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Power-Bus Decoupling With Embedded Capacitance In Printed Circuit Board Design, Minjia Xu, Todd H. Hubing, Juan Chen, Thomas Van Doren, James L. Drewniak, Richard E. Dubroff Feb 2003

Power-Bus Decoupling With Embedded Capacitance In Printed Circuit Board Design, Minjia Xu, Todd H. Hubing, Juan Chen, Thomas Van Doren, James L. Drewniak, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

This paper experimentally investigates the effectiveness of embedded capacitance for reducing power-bus noise in high-speed printed circuit board designs. Boards with embedded capacitance employ closely spaced power-return plane pairs separated by a thin layer of dielectric material. In this paper, test boards with four embedded capacitance materials are evaluated. Power-bus input impedance measurements and power-bus noise measurements are presented for boards with various dimensions and layer stack ups. Unlike discrete decoupling capacitors, whose effective frequency range is generally limited to a few hundred megahertz due to interconnect inductance, embedded capacitance was found to efficiently reduce power-bus noise over the entire …

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In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba2⁢Cu3⁢O6.95, J-H Chung, Takeshi Egami, Rj Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Y. Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, C. Frost, Fatih Dogan Jan 2003

In-Plane Anisotropy And Temperature Dependence Of Oxygen Phonon Modes In Yba2⁢Cu3⁢O6.95, J-H Chung, Takeshi Egami, Rj Mcqueeney, Mohana Yethiraj, Masatoshi Arai, Tetsuya Yokoo, Y. Petrov, Herbert A. Mook, Yasuo Endoh, Setsuko Tajima, C. Frost, Fatih Dogan

Materials Science and Engineering Faculty Research & Creative Works

Inelastic pulsed neutron scattering measurements on YBa2⁢Cu3⁢O6.95 single crystals indicate that the sample has a distinct a-b plane anisotropy in the oxygen vibrations. The Cu-O bond-stretching-type phonons, which are suspected to interact strongly with charge, are simultaneously observed along the a and b directions due to a 7-meV splitting arising from the orthorhombicity, even though the sample is twinned. The bond-stretching LO branch with the polarization along a (perpendicular to the chain) loses intensity beyond the middle of the zone, indicating branch splitting as seen in doped nickelates, with the second branch being located at …

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Statistical Analysis Of Structural Plate Mechanical Properties, Somchat Suwan, Lance Manuel, Karl H. Frank Jan 2003

Statistical Analysis Of Structural Plate Mechanical Properties, Somchat Suwan, Lance Manuel, Karl H. Frank

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

The purpose of this research is to survey the mechanical properties of A572 and A588 plates produced in North America. The study focuses on three aspects: chemical properties, tensile properties, and toughness properties. Results from this study can be of benefit to specification-writing bodies and other users interested in the variability of mechanical properties of A572 and A588 plates. The results can also help update present databases on plate properties that do not include modern production techniques and new mills and producers.--Introduction.

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Estimating The Response Of Cold-Formed Steel Frame Shear Walls, American Iron And Steel Institute Jan 2003

Estimating The Response Of Cold-Formed Steel Frame Shear Walls, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Software Development In The Grid: The Damien Tool-Set, Edgar Gabriel, Rainer Keller, Peggy Lindner, Matthias S. Müller, Michael M. Resch Jan 2003

Software Development In The Grid: The Damien Tool-Set, Edgar Gabriel, Rainer Keller, Peggy Lindner, Matthias S. Müller, Michael M. Resch

Engineering Management and Systems Engineering Faculty Research & Creative Works

The development of applications for Grid-environments is currently lacking the support of tools, which end-users are familiar with from their regular working environment. This paper analyzes the requirements for developing, porting and optimizing scientific applications for Grid-environments. A toolbox designed and implemented in the frame of the DAMIEN project which closes some of the gaps and supports the end-user during the development of the application and its day-to-day usage in Grid-environments is then presented. © Springer-Verlag Berlin Heidelberg 2003.

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Silica Coating Of Gold Nanoparticles, Milind Laxman Surve Jan 2003

Silica Coating Of Gold Nanoparticles, Milind Laxman Surve

Masters Theses

“Gold colloids have been homogenously coated with silica using silane coupling agents as a primer to make the gold surface vitreophilic. After adding active silica, the particles are transferred in ethanol for uniform silica coating by using the Stober method. Gold nanoparticles used for this study ranged from 5 nm up to 40 nm with mixed results. Silica condensation can be controlled to produce different silica thicknesses on gold. The main problem while coating smaller particles (5 nm and 10 nm) was the final coagulation or necking of silica after coating the gold surface. The possible causes for this effect …

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The Strength Of Stiffened Cfs Floor Joist Assemblies With Offset Loading, S. R. Fox Jan 2003

The Strength Of Stiffened Cfs Floor Joist Assemblies With Offset Loading, S. R. Fox

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Nonlinear Time Series Prediction By Weighted Vector Quantization, Amaury Lendasse, D. Francois, V. Wertz, M. Verleysen Jan 2003

Nonlinear Time Series Prediction By Weighted Vector Quantization, Amaury Lendasse, D. Francois, V. Wertz, M. Verleysen

Engineering Management and Systems Engineering Faculty Research & Creative Works

Classical Nonlinear Models for Time Series Prediction Exhibit Improved Capabilities Compared to Linear Ones. Nonlinear Regression Has However Drawbacks, Such as overfilling and Local Minima Problems, User-Adjusted Parameters, Higher Computation Times, Etc. There is Thus a Need for Simple Nonlinear Models with a Restricted Number of Learning Parameters, High Performances and Reasonable Complexity. in This Paper, We Present a Method for Nonlinear Forecasting based on the Quantization of Vectors Concatenating Inputs (Regressors) and Outputs (Predictions). Weighting Techniques Are Applied to Give More Importance to Inputs and Outputs Respectively. the Method is Illustrated on Standard Time Series Prediction Benchmarks. © Springer-Verlag …

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Over-Distention Operation Of Cascaded Multilevel Inverters, X. Kou, Keith Corzine, M. W. Wielebski Jan 2003

Over-Distention Operation Of Cascaded Multilevel Inverters, X. Kou, Keith Corzine, M. W. Wielebski

Electrical and Computer Engineering Faculty Research & Creative Works

Established research has shown that cascaded multilevel inverters can provide more voltage vectors per number of active semiconductors compared to typical multilevel converters. This feature is significant for increasing the drive performance as well as reducing the drive complexity and losses. When two inverters are cascaded, the maximum number of effective levels (or maximal distention operation) is the product of the number of levels of the individual inverters. It is possible to operate the cascaded inverter beyond maximum distention. The over-distention operation is desirable since it effectively increases the number of voltage levels in spite of some missing switching levels. …

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Coolant Pump Drive: An Application For Switched Reluctance Machines, Chris S. Edrington, Babak Fahimi Jan 2003

Coolant Pump Drive: An Application For Switched Reluctance Machines, Chris S. Edrington, Babak Fahimi

Electrical and Computer Engineering Faculty Research & Creative Works

Current vehicle architectures utilize belt driven components such as the coolant pump, air-conditioner, power steering pump etc. However, the trend toward more electric vehicles requires novel applications of machines to replace these inefficient mechanical components. It is essential that electrical machines used in automotive applications be compatible with the corresponding mechanical and electrical terminals. Furthermore, replacement of belt driven components with electrical drives, should be performed as efficient and cost effective as possible. Switched Reluctance Machines (SRM) are both cost effective and very robust to the effects of temperature variation. They also offer a very wide speed range and an …

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Ft-Ir Studies Of Stereo Regular Pmma On Silica: Drying Effects, Bing Zhang, Suntree Kulkeratiyut, Suriyaphongse Kulkeratiyut, Frank D. Blum Jan 2003

Ft-Ir Studies Of Stereo Regular Pmma On Silica: Drying Effects, Bing Zhang, Suntree Kulkeratiyut, Suriyaphongse Kulkeratiyut, Frank D. Blum

Chemistry Faculty Research & Creative Works

A great amount of work has been done on the configuration of surface adsorbed poly(methyl methacrylate) (PMMA), especially on surfaces to which they have a strong attraction. Some studies have been make on the relationships between configuration and tacticity, molecular weight, adsorbed amount, and density of surface hydroxyl groups. The effect of tacticity on the conformation of alumina-adsorbed PMMA in solution and dry spin-coated films were studied by Grohen et al. Their results showed that surface-adsorbed PMMA chains adopted a relatively flat configuration, but iso-PMMA (isotactic) adsorbed on aluminum, with a much larger fraction of the bound carbonyl groups, had …

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