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Articles 1 - 30 of 177
Full-Text Articles in Engineering
Smooth Static And Dynamic Indentation Of A Cantilever Beam, Minggang Zhou, William P. Schonberg
Smooth Static And Dynamic Indentation Of A Cantilever Beam, Minggang Zhou, William P. Schonberg
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The static and dynamic indentation of structural elements such as beams and plates continue to be intriguing problems, especially for scenarios where large area contacts are expected to occur. Standard methods of indentation analyses use a beam theory solution to obtain an overall load-displacement relationship and then a Hertzian contact solution to calculate local stresses under the indenter. However, these techniques are only applicable in a fairly limited class of problems: the stress distribution in the contact region will differ significantly from a Hertzian one when the contact length exceeds the thickness of the beam. The indentation models developed herein …
Two-Dimensional Fast Evanescent Wave Algorithm, W. C. Chew, L. (Lijun) J. Jiang, S. Velamparambil
Two-Dimensional Fast Evanescent Wave Algorithm, W. C. Chew, L. (Lijun) J. Jiang, S. Velamparambil
Electrical and Computer Engineering Faculty Research & Creative Works
A new fast evanescent wave algorithm (FEWA) is introduced in the two-dimensional (2-D) case. It expands the Green's function into propagating waves and directional evanescent waves. Applying the evanescent wave correction technique, a procedure similar to the traditional MLFMA can be expedited. No buffer region is necessary anymore, and fewer translators are needed. Numerical examples are given to show the features of this method.
Aisi Standard For Cold-Formed Steel Framing -- Header Design, American Iron And Steel Institute
Aisi Standard For Cold-Formed Steel Framing -- Header Design, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
The material contained herein has been developed by the American Iron and Steel Institute Committee on Framing Standards. The Committee has made a diligent effort to present accurate, reliable, and useful information on cold-formed steel framing design and installation. The Committee acknowledges and is grateful for the contributions of the numerous researchers, engineers, and others who have contributed to the body of knowledge on the subject. Specific references are included in the Header Standard document. With anticipated improvements in understanding of the behavior of cold-formed steel framing and the continuing development of new technology, this material may eventually become dated. …
Aisi Standard For Cold-Formed Steel Framing -- Truss Design, American Iron And Steel Institute
Aisi Standard For Cold-Formed Steel Framing -- Truss Design, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
The material contained herein has been developed by the American Iron and Steel Institute Committee on Framing Standards. The Committee has made a diligent effort to present accurate, reliable, and useful information on cold-formed steel framing design and installation. The Committee acknowledges and is grateful for the contributions of the numerous researchers, engineers, and others who have contributed to the body of knowledge on the subject. Specific references are included in the Truss Standard document. With anticipated improvements in understanding of the behavior of cold-formed steel framing and the continuing development of new technology, this material may eventually become dated. …
Multimedia Web-Based Resources For Engineering Education: The Media Design And Assessment Laboratory At Umr, Vicki M. Eller, Steve Eugene Watkins, Richard H. Hall, Joel Balestra, Asha S. Rao
Multimedia Web-Based Resources For Engineering Education: The Media Design And Assessment Laboratory At Umr, Vicki M. Eller, Steve Eugene Watkins, Richard H. Hall, Joel Balestra, Asha S. Rao
Business and Information Technology Faculty Research & Creative Works
The Design, Development, and Assessment of Web-Based Multimedia Learning Resources Are Important Aspects of Engineering Education. the Media Design and Assessment Laboratory at the University of Missouri-Rolla Was Established to Facilitate the Interaction between Web Designers and Content Providers. It Was Created under the Auspices of the Instructional Software Development Center. This Paper Will Discuss Design Philosophy in Terms of the Identification of Fundamental Concepts, Development Steps, and Assessment Implementation within the Context of Ongoing Projects. These Projects Include Modules for an Optics Curriculum, Tutorials for an Interdisciplinary Course, and Interactive Software for a Basic Engineering Course.
Power System Deregulation, Mariesa Crow
Power System Deregulation, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Given the difficulties encountered by the state of California in deregulating their electric power industry, many people are questioning the wisdom of such a move. To better understand the motivation behind deregulation, the author looks at the cost of energy nationwide in the United States. For example, she considers some of the regional energy costs from August 2001.
Energy Storage Systems For Advanced Power Applications, Aysen Arsoy, Yilu Liu, Paul F. Ribeiro, Brian K. Johnson, Mariesa Crow
Energy Storage Systems For Advanced Power Applications, Aysen Arsoy, Yilu Liu, Paul F. Ribeiro, Brian K. Johnson, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
While energy storage technologies do not represent energy sources, they provide valuable added benefits to improve stability power quality, and reliability of supply. Battery technologies have improved significantly in order to meet the challenges of practical electric vehicles and utility applications. Flywheel technologies are now used in advanced nonpolluting uninterruptible power supplies. Advanced capacitors are being considered as energy storage for power quality applications. Superconducting energy storage systems are still in their prototype stages but receiving attention for utility applications. The latest technology developments, some performance analysis, and cost considerations are addressed. This paper concentrates on the performance benefits of …
World Wide Web Resources For Materials Science, Serge Abrate
World Wide Web Resources For Materials Science, Serge Abrate
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The internet makes technical information readily available in ways that were unthinkable a few years ago. This article shows how the World Wide Web (the web) can be used in a Materials Science class to enrich the educational process. Strategies for finding and evaluating information and are discussed. © 2002 Wiley Periodicals, Inc.
Inferring Liquid Chaotic Dynamics In Bubble Columns, M. Cassanello, F. Larachi, A. Kemoun, M. (Muthanna) H. Al-Dahhan, M. P. Dudukovic
Inferring Liquid Chaotic Dynamics In Bubble Columns, M. Cassanello, F. Larachi, A. Kemoun, M. (Muthanna) H. Al-Dahhan, M. P. Dudukovic
Chemical and Biochemical Engineering Faculty Research & Creative Works
Experiments Carried Out to Study the Liquid Displacements in Bubble Columns Via the Computer Automated Radioactive Particle Tracking Technique Are Analyzed by Means of Lagrangian and Qualitative Dynamics Tools. the Lagrangian Approach Yields the Detailed Motion Sequences of the Tracer as Entrained by the Fast Ascending Bubbles or by the Liquid Flow Alongside the Column Walls. the Qualitative Dynamics Tools, on the Other Hand, Provide Prima Facie Corroboration of Chaos in Liquid Motion based on an Analysis of the Volume-Averaged Kolmogorov Entropy and the Mutual Information Function. Other Features of the Chaotic Motion, the Reconstructed Attractors and the Radial and …
Monte Carlo Simulations Of Peptide Adsorption On Solid Surfaces (Monte Carlo Simulations Of Peptide Adsorption), D. Song, Daniel Forciniti
Monte Carlo Simulations Of Peptide Adsorption On Solid Surfaces (Monte Carlo Simulations Of Peptide Adsorption), D. Song, Daniel Forciniti
Chemical and Biochemical Engineering Faculty Research & Creative Works
Monte Carlo (MC) simulations of a short peptide in bulk water and at charged and neutral surfaces were performed. To pursue the objective of finding whether or not the water structure around the peptide changes upon adsorption and how these changes affect the orientation of the peptide at the surface, the water structure around the peptide in the bulk and at charged and neutral surfaces were compared by analyzing the pair correlation functions (PCFs) between selected groups in the peptide and the surrounding water. In general, evidence was obtained that water is not homogeneously distributed over the peptide surface.
A Comparison Of Facts Integrated With Battery Energy Storage Systems, Lin Zhang, Shen Chen, Stan Atcitty, Mariesa Crow
A Comparison Of Facts Integrated With Battery Energy Storage Systems, Lin Zhang, Shen Chen, Stan Atcitty, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
The integration of energy storage into FACTS devices lead to increased controller flexibility by providing decentralized active power capabilities. Combined FACTS/ESS can improve power flow control, oscillation damping and voltage control. This paper presents a comparison between the dynamic performance of a StatCom, a StatCom/BESS, an SSSC, an SSSC/BESS and a UPFC. Experimental verification is also presented.
Dc Power-Bus Modeling And Design With A Mixed-Potential Integral-Equation Formulation And Circuit Extraction, Jun Fan, James L. Drewniak, Hao Shi, James L. Knighten
Dc Power-Bus Modeling And Design With A Mixed-Potential Integral-Equation Formulation And Circuit Extraction, Jun Fan, James L. Drewniak, Hao Shi, James L. Knighten
Electrical and Computer Engineering Faculty Research & Creative Works
Application of a circuit extraction approach based on a mixed-potential integral equation formulation (CEMPIE) for dc power-bus modeling in high-speed digital designs is detailed herein. Agreement with measurements demonstrates the effectiveness of the approach. Dielectric losses are included into the calculation of Green's functions, and thus, incorporated into the rigorous first principles formulation. A SPICE model is then extracted from the discretized integral equation. A quasistatic approximation is used for Green's functions to keep the extracted circuit elements frequency independent. Previous work has established a necessary meshing criterion in order to ensure accuracy for a given substrate thickness and dielectric …
Quantifying Smt Decoupling Capacitor Placement In Dc Power-Bus Design For Multilayer Pcbs, Jun Fan, James L. Drewniak, James L. Knighten, Norman W. Smith, Antonio Orlandi, Thomas Van Doren, Todd H. Hubing, Richard E. Dubroff
Quantifying Smt Decoupling Capacitor Placement In Dc Power-Bus Design For Multilayer Pcbs, Jun Fan, James L. Drewniak, James L. Knighten, Norman W. Smith, Antonio Orlandi, Thomas Van Doren, Todd H. Hubing, Richard E. Dubroff
Electrical and Computer Engineering Faculty Research & Creative Works
Noise on a dc power-bus that results from device switching, as well as other potential mechanisms, is a primary source of many signal integrity (SI) and electromagnetic interference (EMI) problems. Surface mount technology (SMT) decoupling capacitors are commonly used to mitigate this power-bus noise. A critical design issue associated with this common practice in high-speed digital designs is placement of the capacitors with respect to the integrated circuits (ICs). Local decoupling, namely, placing SMT capacitors in proximity to ICs, is investigated in this study. Multilayer PCB designs that employ entire layers or area fills for power and ground in a …
Closure To Discussion Of "Voltage Stability Analysis: V-Q Power Flow Simulation Versus Dynamic Simulation", Badrul H. Chowdhury, C. W. Taylor
Closure To Discussion Of "Voltage Stability Analysis: V-Q Power Flow Simulation Versus Dynamic Simulation", Badrul H. Chowdhury, C. W. Taylor
Electrical and Computer Engineering Faculty Research & Creative Works
No abstract provided.
Dc Power-Bus Design Using Fdtd Modeling With Dispersive Media And Surface Mount Technology Components, Xiaoning Ye, Marina Koledintseva, Min Li, James L. Drewniak
Dc Power-Bus Design Using Fdtd Modeling With Dispersive Media And Surface Mount Technology Components, Xiaoning Ye, Marina Koledintseva, Min Li, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
DC power-bus modeling in high-speed digital design using the finite-difference time-domain (FDTD) method is demonstrated herein. The dispersive character of the dielectric layers used in printed circuit board substrates is taken into account in this study. In particular, FR-4 is considered. The complex permittivity of the dielectric is approximated by a Debye model. A wide-band frequency response (100 MHz-5 GHz) is obtained through a single FDTD simulation. Good agreement is achieved between the modeled and measured results for a typical dc power-bus structure with multiple surface mount technology (SMT) decoupling capacitors placed on the printed circuit board (PCB). The FDTD …
Emi Mitigation With Multilayer Power-Bus Stacks And Via Stitching Of Reference Planes, Xiaoning Ye, David M. Hockanson, Min Li, Yong Ren, Wei Cui, James L. Drewniak, Richard E. Dubroff
Emi Mitigation With Multilayer Power-Bus Stacks And Via Stitching Of Reference Planes, Xiaoning Ye, David M. Hockanson, Min Li, Yong Ren, Wei Cui, James L. Drewniak, Richard E. Dubroff
Electrical and Computer Engineering Faculty Research & Creative Works
General methods for reducing printed circuit board (PCB) emissions over a broad band of high frequencies are necessary to meet EMI requirements, as processors become faster and more powerful. One mechanism by which EMI can be coupled off a PCB or multichip module (MCM) structure is from high-frequency fringing electric fields on the dc power and reference planes at the substrate periphery An approach for EMI mitigation by stitching multiple ground planes together along the periphery of multilayer PCB power-bus stacks with closely spaced vias is reported and quantified in this paper. Power-bus noise induced EMI and coupling from the …
Practical Issues For The Application Of High-Performance Concrete To Highway Structures, John J. Myers, Yumin Yang
Practical Issues For The Application Of High-Performance Concrete To Highway Structures, John J. Myers, Yumin Yang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In recent years, the advantages of high-performance concrete (HPC) have been well documented. Among others, these advantages include enhanced design flexibility and improved durability performance that results in reduced maintenance costs and an increased service life. Despite these obvious benefits, the implementation of HPC has been very slow. This can be attributed to several factors including the uncertainty related to current design codes and a lack of familiarity of designers and contractors with practices and requirements for proper design and construction of high-performance concrete structures. This paper introduces and discusses several fundamental issues that affect the implementation of HPC and …
Size-Induced Lattice Relaxation In Ceo₂ Nanoparticles, X.-D. Zhou, Wayne Huebner
Size-Induced Lattice Relaxation In Ceo₂ Nanoparticles, X.-D. Zhou, Wayne Huebner
Materials Science and Engineering Faculty Research & Creative Works
Size-induced lattice relaxation was observed for nanoscale CeO2 single crystals with an average size from 4 to 60 nm. Results showed the finest crystallites exhibited no strain-induced line broadening, while high temperature annealing resulted in larger grain sizes and significant strains. The observed shift in the x-ray diffraction lattice parameters was assumed to be due to the formation of defects on the lattice, specifically oxygen vacancies. Modeling revealed that the oxygen vacancy concentration ([V••O]) was found to be ≈4 x 1020/cm3 for the 4 nm crystallites, and decreased two orders of magnitude for …
A New Crystalline Phase (Na2o · 8teo2) In The Na2o-Teo2 System, Dongmei Zhu, Wancheng Zhou, C. S. Ray
A New Crystalline Phase (Na2o · 8teo2) In The Na2o-Teo2 System, Dongmei Zhu, Wancheng Zhou, C. S. Ray
Materials Science and Engineering Faculty Research & Creative Works
The formation and decomposition of NT8 crystal phase was investigated using differential scanning calorimetry (DSC) and x-ray diffraction analysis (XRD). DSC measurements indicated that all the glasses used in the investigation crystallized at about 330±5 °C. Results suggested that the NT8 phase, which was very stable at 330 °C was not stable at or above 340 °C and readily decomposed to NT4 and TeO2.
Earthquake Hazard Assessment Along Designated Emergency Vehicle Priority Access Routes, Neil Lennart Anderson, Hal Baker, Genda Chen, Tom Hertell, David J. Hoffman, Ronaldo Luna, Yulman Munaf, Shamsher Prakash, Paul Michael Santi, Richard Wesley Stephenson
Earthquake Hazard Assessment Along Designated Emergency Vehicle Priority Access Routes, Neil Lennart Anderson, Hal Baker, Genda Chen, Tom Hertell, David J. Hoffman, Ronaldo Luna, Yulman Munaf, Shamsher Prakash, Paul Michael Santi, Richard Wesley Stephenson
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Because of the compelling need to reopen vehicular access routes to Sikeston, Cape Girardeau and St. Louis following a devastating earthquake, Missouri Department of Transportation initiated a study of those portions of US 60 and MO 100 that have been officially designated as emergency vehicle priority access routes. The primary objectives of this study were twofold. Objective 1 was to establish a current subsurface and earthquake design geographic information systems (GIS) database for areas in proximity to designated portions of US 60 and MO 100 (includes counties of Butler, Stoddard, New Madrid, Franklin and St. Louis). Objective 2 was to …
Ultrasonic Characterization Of Poling In Lead Zirconate Titanate Ceramics, James R. Friend, Eric Jamieson, Marvin Pennell, Wayne Huebner
Ultrasonic Characterization Of Poling In Lead Zirconate Titanate Ceramics, James R. Friend, Eric Jamieson, Marvin Pennell, Wayne Huebner
Materials Science and Engineering Faculty Research & Creative Works
A method for measuring the spatial variation of the macroscopic poling state of a piezoelectric material using an ultrasonic transducer is described. The relatively simple method clearly indicates the distribution of poling within the material, demonstrated by the testing of a collection of partially poled lead zirconate titanate samples.
Highly Plasma Etch-Resistant Photoresist Composition Containing A Photosensitive Polymeric Titania Precursor, Tony D. Flaim, Douglas J. Guerrero, Michelle R. Fowler, William Joseph James, Vladimir Petrovsky, Harlan U. Anderson
Highly Plasma Etch-Resistant Photoresist Composition Containing A Photosensitive Polymeric Titania Precursor, Tony D. Flaim, Douglas J. Guerrero, Michelle R. Fowler, William Joseph James, Vladimir Petrovsky, Harlan U. Anderson
Chemistry Faculty Research & Creative Works
A composition is derived from an addition polymerizable organotitanium polymer which upon exposure to an oxygen plasma or baking in air, is converted to titanium dioxide (titania) or is converted to a mixed, titanium-containing metal oxide. The metal oxide formed in situ imparts etch- resistant action to a patterned photoresist layer. The composition may also be directly deposited and patterned into permanent metal oxide device features by a photolithographic process.
The Effects Of Via Transitions On Differential Signals, Chen Wang, Jun Fan, James L. Knighten, Norman W. Smith, Ray Alexander, James L. Drewniak
The Effects Of Via Transitions On Differential Signals, Chen Wang, Jun Fan, James L. Knighten, Norman W. Smith, Ray Alexander, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
Vias in differential transmission lines have been modeled using the finite-difference time-domain (FDTD) method. The velocity that the differential signal propagated through the vias was estimated. Differential S-parameters were calculated up to 50 GHz. Below 10 GHz, the differential signal can propagate through vias without much reflection and distortion. However, as frequency increases, the reflection from the vias and the loss of differential power become significant.
Metrics-Guided Quality Management For Component-Based Software Systems, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul
Metrics-Guided Quality Management For Component-Based Software Systems, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul
Electrical and Computer Engineering Faculty Research & Creative Works
The growing reliance on commercial-off-the-shelf (COTS) components for developing large-scale projects introduces a new paradigm in software Engineering; which requires the design of new software development and business processes. Large scale component reuse leads to savings in development resources, enabling these resources to be applied to areas such as quality improvement. These savings come at the price of integration difficulties, performance constraints, and incompatibility of components from multiple vendors. Relying on COTS components also increases the system''s vulnerability to risks arising from third-party development, which can negatively affect the quality of the system, as well as causing expenses not incurred …
Pilot Study: Lateral Braced C-Sections Under Bending, B. Beshara, Roger A. Laboube
Pilot Study: Lateral Braced C-Sections Under Bending, B. Beshara, Roger A. Laboube
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The overall behavior under uniform load of cold-formed steel C-sections assemblies was investigated. Each test assembly consisted of C-sections acting as beams having a track section to restrain its ends. A lateral brace to restrain the C-sections from rotation was provided at mid-span. To better understand the influence of the brace on the flexural behavior, an experimental investigation was carried out with particular emphasis placed on the study of the effect of the mid-span brace connection when wallboard was attached to the tension flange. The tested moment capacities are compared to predictions based on the 1996 edition American Iron and …
A Simple, Robust, And On-Site Microwave Technique For Determining Water-To-Cement Ratio (W/C) Of Fresh Portland Cement-Based Materials, K. Mubarak, Karl Joseph Bois, R. Zoughi
A Simple, Robust, And On-Site Microwave Technique For Determining Water-To-Cement Ratio (W/C) Of Fresh Portland Cement-Based Materials, K. Mubarak, Karl Joseph Bois, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
Inspection and evaluation of cement-based materials such as concrete is of great interest to the construction industry. In particular, real-time and on-site evaluation of water-to-cement ratio (w/c) is an important practical issue, since the compressive strength of a concrete structure is significantly influenced by its w/c. Currently, there is no single real-time, on-site, relatively in-expensive, easy-to-implement, and operator friendly technique for evaluating this parameter. Microwave nondestructive testing and evaluation techniques have shown great promise when used for inspection and evaluation of the properties of cement-based materials. In this paper, the optimal design of a monopole antenna probe used to evaluate …
Traditional Signal Pattern Recognition Versus Artificial Neural Networks For Nuclear Plant Diagnostics, Shahla Keyvan
Traditional Signal Pattern Recognition Versus Artificial Neural Networks For Nuclear Plant Diagnostics, Shahla Keyvan
Nuclear Engineering and Radiation Science Faculty Research & Creative Works
This paper introduces a new tool based on a traditional noise analysis technique for monitoring reactor components' signal condition. It also presents the performance of artificial neural networks for pattern recognition to the same set of reactor signals and provides a comparison of these two techniques. Reactor pump signals from the Experimental Breeder Reactor (EBR-II) are utilized here. Collected signals such as pump power, pump speed, and pump pressure are obtained from already installed sensors in the reactor. The signals utilized are collected signals as well as generated signals simulating the pump shaft degradation progress. From the study of time …
The Effect Of Low Levels Of Zirconia Addition On The Mechanical Properties Of Hydroxyapatite, Mark R. Towler, I. R. Gibson
The Effect Of Low Levels Of Zirconia Addition On The Mechanical Properties Of Hydroxyapatite, Mark R. Towler, I. R. Gibson
Chemical and Biochemical Engineering Faculty Research & Creative Works
The effect of low levels of zirconia addition on the mechanical properties of hydroxyapatite was analyzed. Optimum amount of zirconia required to prevent decomposition of hydroxyapatite during sintering was determined. The particle size, morphology and surface area were measured and calcium to phosphorus ratio and trace element impurity content were determined by x-ray fluorescence. Low level addition of zirconia resulted in composites with better mechanical properties and minimum levels of decomposition.
Proxy Servers For Scalable Interactive Video Support, Husni Fahmi, Mudassir Latif, Sahra Sedigh, Arif Ghafoor, Peiya Liu, Liang Hsu
Proxy Servers For Scalable Interactive Video Support, Husni Fahmi, Mudassir Latif, Sahra Sedigh, Arif Ghafoor, Peiya Liu, Liang Hsu
Electrical and Computer Engineering Faculty Research & Creative Works
Targeting scalability, load balance and resource efficiency in streaming multimedia applications, proxy servers facilitate faster real-time access to cached objects and reduce response time to document requests.
Optical Properties Of Ceo2 Films Prepared From Colloidal Suspension, V. Petrovsky, B. P. Gorman, Harlan U. Anderson, T. Petrovsky
Optical Properties Of Ceo2 Films Prepared From Colloidal Suspension, V. Petrovsky, B. P. Gorman, Harlan U. Anderson, T. Petrovsky
Materials Science and Engineering Faculty Research & Creative Works
Electronic Materials Applied Research Center, University of Missouri-Rolla, Rolla, Missouri 65409-1170 Optical absorption of nanocrystalline thin films can be influenced by the presence of both porosity and grain size effects. If both are present simultaneously, their effects are difficult to separate. In this study it is shown that the combination of uv-vis transmittance and reflectance measurements on porous CeO2 films provides enough data to make this separation. The CeO2 films were prepared by deposition of nanosized (∼5 nm) particles from a water colloidal suspension onto sapphire and subjecting these films to sintering temperatures sufficiently high to provide a …