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Articles 13081 - 13110 of 21751

Full-Text Articles in Engineering

Four-Terminal Quantum Resistor Network For Electron-Wave Computing, Diwakar Ramamurthy, Cheng-Hsiao Wu Sep 2002

Four-Terminal Quantum Resistor Network For Electron-Wave Computing, Diwakar Ramamurthy, Cheng-Hsiao Wu

Electrical and Computer Engineering Faculty Research & Creative Works

Interconnected ultrathin conducting wires or, equivalently, interconnected quasi-one-dimensional electron waveguides, which form a quantum resistor network, are presented here in four-terminal configurations. The transmission behaviors through such four-terminal networks are evaluated and classified. In addition, we show that such networks can be used as the basic building blocks for a possible massive wave computing machine in the future. In a network, each interconnection, a node point, is an elastic scatterer that routes the electron wave. Routing and rerouting of electron waves in a network is described in the framework of quantum transport from Landauer-Buttiker theory in the presence of multiple …

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Calibrattions Of Cold-Formed Steel Welded Connections, F. M. Tangorra, R. M. Schuster, Roger A. Laboube Aug 2002

Calibrattions Of Cold-Formed Steel Welded Connections, F. M. Tangorra, R. M. Schuster, Roger A. Laboube

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

The purpose of this project was to recalibrate the welded connection equations currently contained in the American Iron and Steel Institute (AISI) Specification for the Design of Cold Formed Steel Structural Members (AISI 1996a). Only one factor of safety of 2.50 is presented for the each of the various types of welded connections when using allowable stress design (ASD), but different respective resistance factors are given for load and resistance factor design (LRFD). The data used was solely taken from the research conducted by Pekoz and McGuire (Pekoz and McGuire 1979). Calibrations were carried out and based on both the …

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A Study On The Factors That Influence The Acoustic Performance Of A Steel Stud Wall Assembly, Hyun-Suk Chung, Gap-Deug Kim, Kwan-Seob Yang, Kyung-Woo Kim Aug 2002

A Study On The Factors That Influence The Acoustic Performance Of A Steel Stud Wall Assembly, Hyun-Suk Chung, Gap-Deug Kim, Kwan-Seob Yang, Kyung-Woo Kim

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

With the recent introduction of light gauge steel framing systems in the concrete-dominated Korean construction industry, more buildings are built with drywall that is mainly composed of steel studs and gypsum boards. While load-bearing steel studs are extensively applied in residential construction, nonload-bearing steel studs are applied in various building fields such as commercial, educational, as well as residential. As building projects involving steel stud walls are becoming to increase, higher demands in performance are requested from architects and builders, especially in the field of sound performance. A series of acoustic test were performed in the nationally certified sound-testing laboratory …

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Aisi Committee On Framing Standards Enabling The Widespread And Economic Useof Steel Framing, Kevin R. Bielat, Jay W. Larson Aug 2002

Aisi Committee On Framing Standards Enabling The Widespread And Economic Useof Steel Framing, Kevin R. Bielat, Jay W. Larson

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

The American Iron & Steel Institute launched the Committee on Framing Standards in 1998 with the mission to eliminate regulatory barriers and increase the reliability and cost competitiveness of cold-formed steel framing through improved design and installation standards. Building on the internationally recognized AISI Specification, and working closely with the Steel Framing Alliance, Light Gauge Steel Engineers Association, Steel Stud Manufacturers Association and Canadian Sheet Steel Building Institute, this relatively new organization has developed and published four new ANSI-accredited consensus standards. Topics include General Provisions, Truss Design and Header Design, as well as a comprehensive Prescriptive Method for One and …

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North American Specification For Design Of Cold-Formed Steel, Roger L. Brockenbrough, Helen H. Chen Aug 2002

North American Specification For Design Of Cold-Formed Steel, Roger L. Brockenbrough, Helen H. Chen

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

For over fifty years, the American Iron and Steel Institute has published the widely used Specification for the Design of Cold-Fom1ed Steel Structural Members. Recently, as a result of collaborative efforts with representatives of Canada and Mexico, the AISI Specification was expanded into a new document for use in all three countries. Now known as the North American Specification for the Design of Cold-Formed Steel Structural Members, the new edition supersedes the previous AISI Specification and the Canadian Sl36 Standard. This paper reviews the differences between the previous AISI Specification and the new North American Specification. The basic core document …

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Investigation Of Part Accuracy And Surface Roughness In Rapid Freeze Prototyping Based Investment Casting, Qingbin Liu, Ming-Chuan Leu, Stephen M. Schmitt Aug 2002

Investigation Of Part Accuracy And Surface Roughness In Rapid Freeze Prototyping Based Investment Casting, Qingbin Liu, Ming-Chuan Leu, Stephen M. Schmitt

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The study as described in this paper is aimed at investigating the dimensional accuracy and surface finish of metal parts made by investment casting with ice patterns generated by rapid freeze prototyping. The process of investment casting with ice patterns is described and contrast with conventional investment casting with wax patterns is made. The selection of binder material for ceramic slurries and the need for an interface agent to separate the ice pattern from the ceramic slurry in the mold making process are discussed. The accuracy and surface finish of ice patterns and of the metal castings are presented and …

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System Integration And Real-Time Control Architecture Of A Laser Aided Manufacturing Process, Mallikharjuna R. Boddu, Robert G. Landers, Srinivas Musti, Sanjeev Agarwal, Jianzhong Ruan, Frank W. Liou Aug 2002

System Integration And Real-Time Control Architecture Of A Laser Aided Manufacturing Process, Mallikharjuna R. Boddu, Robert G. Landers, Srinivas Musti, Sanjeev Agarwal, Jianzhong Ruan, Frank W. Liou

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This paper discusses a hybrid deposition–removal manufacturing system being developed at the University of Missouri--Rolla. The system consists of a laser system, five-axis CNC machining center, and powder feeder system. A description of the control software, real-time control architecture, and integration of various subsystems to build the hybrid system is given. The interaction of the real-time controller with various sensors and subsystems to monitor and regulate the process is presented. The communication between integrated process planning for the system and real–time control is also discussed in this paper.

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A Study On Effects Of Process Parameters In Rapid Freeze Prototyping, Frances D. Bryant, Guanghua Sui, Ming-Chuan Leu Aug 2002

A Study On Effects Of Process Parameters In Rapid Freeze Prototyping, Frances D. Bryant, Guanghua Sui, Ming-Chuan Leu

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Rapid Freeze Prototyping (RFP) is a relatively new solid freeform fabrication process, which builds a three-dimensional part according to a CAD model by depositing and freezing water droplets layer by layer. A study on the effects of RFP process parameters including the nozzle scanning speed, droplet size, and droplet frequency in building ice parts with a single-nozzle work head is made. Presented in this paper are the results of this study which indicate that these process parameters determine the ice layer thickness and ice line width, which in turn determine the surface roughness and the waiting time required after depositing …

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Object-Oriented Modeling And Fault Detection Of A Powder Feeder For A Laser Metal Deposition System, Robert G. Landers, Michael Gene Hilgers, Frank W. Liou, Bruce M. Mcmillin Aug 2002

Object-Oriented Modeling And Fault Detection Of A Powder Feeder For A Laser Metal Deposition System, Robert G. Landers, Michael Gene Hilgers, Frank W. Liou, Bruce M. Mcmillin

Mechanical and Aerospace Engineering Faculty Research & Creative Works

One of the most critical components of a laser metal deposition system is the powder feeder unit. Techniques are required to efficiently design and analyze these systems and to ensure fault tolerance during the operation. In this paper, a model of the powder feeder unit, based on object-oriented abstractions of it components, is developed. This model is modular in that specific components can be efficiently updated or replaced with components that perform a similar function. In addition, the model can be used for simulation allowing for efficient design and analysis. Assurance of the correctness of the powder feeder system is …

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Laser Aided Part Repair -- A Review, Jinglei Wang, Sashikanth Prakash, Yashodhan Joshi, Frank W. Liou Aug 2002

Laser Aided Part Repair -- A Review, Jinglei Wang, Sashikanth Prakash, Yashodhan Joshi, Frank W. Liou

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Laser aided part-repair is an emerging trend that has great potential for future industrial applications. Part-repair technologies are currently used in repairing military and civilian equipment. The focus of this paper is to review the current repair processes, which use the laser-aided metal deposition technology. Many metal parts, which are worn by continual use, can be restored to working condition by the deposition of metal with a laser and machining. This not only extends the life of the part, but also, saves on cost. A comparison between various processes, their parameters, efficiency, cost, and etc. are also presented. The process …

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Object-Oriented Modeling And Fauly Detection Of A Powder Feeder For A Laser Metal Deposition System, Robert G. Landers, Michael Gene Hilgers, Frank W. Liou, Bruce M. Mcmillin Aug 2002

Object-Oriented Modeling And Fauly Detection Of A Powder Feeder For A Laser Metal Deposition System, Robert G. Landers, Michael Gene Hilgers, Frank W. Liou, Bruce M. Mcmillin

Mechanical and Aerospace Engineering Faculty Research & Creative Works

One of the most critical components of a laser metal deposition system is the powder feeder unit. Techniques are required to efficiently design and analyze these systems and to ensure fault tolerance during the operation. In this paper, a model of the powder feeder unit, based on object- oriented abstractions of it components, is developed. This model is modular in that specific components can be efficiently updated or replaced with components that perform a similar function. In addition, the model can be used for simulation allowing for efficient design and analysis. Assurance of the correctness of the powder feeder system …

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New Plane Wave Representation Of Point Sources, L. (Lijun) J. Jiang, W. C. Chew Aug 2002

New Plane Wave Representation Of Point Sources, L. (Lijun) J. Jiang, W. C. Chew

Electrical and Computer Engineering Faculty Research & Creative Works

A new method to decompose the spherical wave of a 3D point source into plane waves is discussed. Using Cauchy's theorem, it represents spherical waves as the summation of surface-direction-wave integrals. Results show that only 6 directions waves needed storage. Thus, the method provides a good cost reduction for plane-wave related algorithms.

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Ccfss Technical Bulletin August 2002, Wei-Wen Yu Center For Cold-Formed Steel Structures Aug 2002

Ccfss Technical Bulletin August 2002, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Ccfss News August 2002, Wei-Wen Yu Center For Cold-Formed Steel Structures Aug 2002

Ccfss News August 2002, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Newsletters (1999 - 2008)

No abstract provided.

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External Parasitic Inductance In Microstrip And Stripline Geometries Of Finite Size, Marina Koledintseva, James L. Drewniak, Thomas Van Doren, David M. Hockanson Aug 2002

External Parasitic Inductance In Microstrip And Stripline Geometries Of Finite Size, Marina Koledintseva, James L. Drewniak, Thomas Van Doren, David M. Hockanson

Electrical and Computer Engineering Faculty Research & Creative Works

An external parasitic ground (return) plane inductance, or a mutual inductance associated with fringing magnetic fields in planar transmission line structures, is the culprit of common-mode voltage (ground plane noise) that leads to parasitic radiation of the corresponding unintentional "antennas" in high-speed electronic equipment. Mutual inductance of this sort in microstrip and stripline structures is studied here using an analytical quasi- magnetostatic approach and FDTD modeling. Closed-form expressions for mutual inductance in symmetrical and asymmetrical microstrip and stripline structures are presented.

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Modeling Noise Coupling From Non-Parallel Pcb Trace Routing, Shaofeng Luan, Fengchao Xiao, W. Liu, Jun Fan, Yoshio Kami, James L. Drewniak, Richard E. Dubroff Aug 2002

Modeling Noise Coupling From Non-Parallel Pcb Trace Routing, Shaofeng Luan, Fengchao Xiao, W. Liu, Jun Fan, Yoshio Kami, James L. Drewniak, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

Coupling between PCB signal traces in proximity is of concern to PCB designers and EMC engineers. The behavior of noise coupling between non-parallel microstrip lines is studied in this paper by a full-wave numerical modeling method CEMPIE, designating a circuit extraction approach based on a mixed-potential integral equation formulation. Good agreement between the numerical results and measurements was obtained.

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Quality Enhancement Of Reconfigurable Multichip Module Systems By Redundancy Utilization, Minsu Choi, Nohpill Park, Fabrizio Lombardi, Vincenzo Piuri Aug 2002

Quality Enhancement Of Reconfigurable Multichip Module Systems By Redundancy Utilization, Minsu Choi, Nohpill Park, Fabrizio Lombardi, Vincenzo Piuri

Electrical and Computer Engineering Faculty Research & Creative Works

This paper evaluates the quality effectiveness of redundancy utilization in reconfigurable multichip mode (RMCM) systems. Due to reconfigurability, the RMCM system can implement a device with different redundancy levels. A redundancy level is determined by the requirement of fault tolerance (FT) of the device under implementation which can be realized through reconfiguration. No previous work has adequately investigated the effect of utilization of redundancy on the quality-level (QL) of RMCM. In this paper, the tolerance to escape from testing is also introduced to provide more extensive and comprehensive analysis and is referred to as escape tolerance (ET). This can be …

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Temporal Modeling Of Software Test Coverage, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul Aug 2002

Temporal Modeling Of Software Test Coverage, Sahra Sedigh, Arif Ghafoor, Raymond A. Paul

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a temporal model for the coverage achieved by software testing. The proposed model, which is applicable at any level of the testing hierarchy, can determine the value of test coverage at any given time, as well as predicting future values. The model is comprised of two main components: coverage functions, and the coverage matrix. The coverage functions represent the coverage of a single entity as a function of time and reflect the test environment through their stochastic parameters. The coverage matrix utilizes the coverage functions to depict the coverage attained for each entity by each test within …

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Adaptive Neural Network Identifiers For Effective Control Of Turbogenerators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Ronald G. Harley, Donald C. Wunsch Aug 2002

Adaptive Neural Network Identifiers For Effective Control Of Turbogenerators In A Multimachine Power System, Ganesh K. Venayagamoorthy, Ronald G. Harley, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

This paper provides a novel method for nonlinear identification of multiple turbogenerators in a five-machine 12-bus power system using continually online trained (COT) artificial neural networks (ANNs). Each turbogenerator in the power system is equipped with all adaptive ANN identifier, which is able to identify/model its particular turbogenerator and rest of the network to which it is connected from moment to moment, based on only local measurements. Each adaptive ANN turbogenerator can be used in the design of a nonlinear controller for each turbogenerator in a multimachine power system. Simulation results for the adaptive ANN identifiers are presented

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Alternatives To Gaskets In Shielding An Enclosure, Federico Centola, David Pommerenke, James L. Drewniak, Xiao Kai Aug 2002

Alternatives To Gaskets In Shielding An Enclosure, Federico Centola, David Pommerenke, James L. Drewniak, Xiao Kai

Electrical and Computer Engineering Faculty Research & Creative Works

It is well known that a properly placed conductive gasket can complete an enclosure to yield good shielding. But often there are reasons, e.g. control of mechanical dimensions that this cannot be achieved. For these cases, one may want to avoid using a gasket that requires contacts. This paper will analyze alternatives to continuously contacting gaskets such as overlap structures, overlapping structures with different lossy and non-lossy materials, and overlaps with grounding points. It will compare structures by sufficient shielding for a typical class B product, high frequency (1-3 GHz) and low frequency (below 1 GHz) performance.

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Fdtd Analysis Of Printed Circuit Boards Containing Wideband Lorentzian Dielectric Dispersive Media, Marina Koledintseva, David Pommerenke, James L. Drewniak Aug 2002

Fdtd Analysis Of Printed Circuit Boards Containing Wideband Lorentzian Dielectric Dispersive Media, Marina Koledintseva, David Pommerenke, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

A Lorentzian model as the general case of a frequency-dependent behavior of a dispersive dielectric material is considered in this paper. Recursive convolution algorithms for the finite-difference time-domain (FDTD) technique for two cases of a Lorentzian medium, narrowband and wideband, depending on the ratio of a resonance line half-width at -3 dB and the resonance frequency of the material, are detailed. It is shown that a wideband Lorentzian model of a dielectric FR-4 used in printed circuit boards is more flexible and gives good agreement with experimental curves, and may be preferable as compared to a Debye model.

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Field Extraction From Near Field Scanning For A Microstrip Structure, Lin Zhang, Kevin P. Slattery, Chen Wang, Masahiro Yamaguchi, K.-I. Arai, Richard E. Dubroff, James L. Drewniak, David Pommerenke, Todd H. Hubing Aug 2002

Field Extraction From Near Field Scanning For A Microstrip Structure, Lin Zhang, Kevin P. Slattery, Chen Wang, Masahiro Yamaguchi, K.-I. Arai, Richard E. Dubroff, James L. Drewniak, David Pommerenke, Todd H. Hubing

Electrical and Computer Engineering Faculty Research & Creative Works

Currents associated with high-speed digital devices have significant impacts on EMI problems in VLSI design and operation. In this paper, a simple transmission line model was implemented as an initial step to represent the EMI mechanisms associated with an IC package. Numerical modeling results were compared with near field scanning measurements and show that the magnetic field deduced from the measurements agrees well with the numerical predictions.

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Estimating Dc Power Bus Noise, Jingkun Mao, Bruce Archambeault, James L. Drewniak, Thomas Van Doren Aug 2002

Estimating Dc Power Bus Noise, Jingkun Mao, Bruce Archambeault, James L. Drewniak, Thomas Van Doren

Electrical and Computer Engineering Faculty Research & Creative Works

Simultaneous switching noise (SSN) resulting from IC devices can result in significant power bus noise, as well as radiation problems. An approach for estimating the power bus noise spectrum is presented in this paper. The power bus noise caused by digital circuits injecting high-frequency noise onto the DC buses feeding digital devices is calculated. The transient current drawn by an IC device is modeled using the load current and the shoot-through current through the power dissipation capacitance. Modeling and experimental results for several digital chips are shown. The modeling agrees well with the experimental results.

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Surface Switching Characteristics Of Variable Permittivity Dielectrics, Wayne Huebner, Eric J. Carleton Aug 2002

Surface Switching Characteristics Of Variable Permittivity Dielectrics, Wayne Huebner, Eric J. Carleton

Materials Science and Engineering Faculty Research & Creative Works

Flashover voltage, lifetimes, and switch performance of insulators utilizing square thin and thick film electrodes were examined to determine the viability of using thin electrodes for reliable surface discharge switching. Gold, silver, and platinum were sputtered (0.25 µm) and screen printed (15 µm) onto Al2O3, TiO2, and modified BaTiO3 (MBT), then tested in air at 105 Pa, under vacuum (10-3/ torr), and while immersed in an insulating fluid, SF-2 (manufactured by 3M). For the measured range of 0.5 to 3 mm in air, the flashover voltage for all three insulators …

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Numerical Modeling Of Esd-Simulators, Kai Wang, David Pommerenke, Ramachandran Chundru Aug 2002

Numerical Modeling Of Esd-Simulators, Kai Wang, David Pommerenke, Ramachandran Chundru

Electrical and Computer Engineering Faculty Research & Creative Works

ESD generators are widely used for testing the robustness of electronic equipment against human electrostatic discharge via small metal pieces (e.g. key). Presently the IEC 61000-4-2 ESD standard is hotly discussed to improve test result reproducibility. This paper numerically analyzes an ESD simulator and relates its construction parameters to discharge current and field parameters. It uses FDTD method and models the relay (contact mode discharge) as a material with time dependent conductivity. The process is broken down into a charging phase and a stabilization phase until the electrostatic conditions are reached. Then the conductivity of the relay is changed and …

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Anticipating Full Vehicle Radiated Emi From Module-Level Testing In Automobiles, Geping Liu, Chingchi Chen, Yuhua Tu, James L. Drewniak Aug 2002

Anticipating Full Vehicle Radiated Emi From Module-Level Testing In Automobiles, Geping Liu, Chingchi Chen, Yuhua Tu, James L. Drewniak

Electrical and Computer Engineering Faculty Research & Creative Works

EMI due to common-mode currents on cables routed in automobiles was studied using a test device designed to mimic a vehicle. Both experimental work and Finite-Difference Time-Domain (FDTD) modeling were employed in this paper. The good agreement between the measurements and modeling results indicates that the numerical tools can be a useful aid in predicting vehicle-level EMI by developing vehicle transfer functions and measuring the module-level EMI characteristics on the bench top.

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Application Of Higher-Order Fem Elements To The Analysis Of Microstrip Structures, H. Wang, C. L. Guo, Todd H. Hubing, James L. Drewniak, Thomas Van Doren, Richard E. Dubroff Aug 2002

Application Of Higher-Order Fem Elements To The Analysis Of Microstrip Structures, H. Wang, C. L. Guo, Todd H. Hubing, James L. Drewniak, Thomas Van Doren, Richard E. Dubroff

Electrical and Computer Engineering Faculty Research & Creative Works

Microstrip structures, formed by metal traces printed on a dielectric substrate above a reference plane, are frequently the object of electromagnetic modeling. In this paper, hybrid FEM/MoM formulations employing conventional Whitney elements and newly developed linear-tangent/linear-normal (LT/LN) tangential vector finite elements (TVFEs) are applied to the analysis of microstrip structures with thin traces. This paper shows that the variation of the electric field below the trace is a significant issue to be addressed in microstrip structure modeling. Different mesh methods are investigated and the advantages of the LT/LN TVFEs are discussed.

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The Woman's Guide To Navigating The Ph.D. In Engineering & Science [Book Review], Mariesa Crow Aug 2002

The Woman's Guide To Navigating The Ph.D. In Engineering & Science [Book Review], Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Transmission Line Modeling Of Vias In Differential Signals, Chen Wang, James L. Drewniak, Jun Fan, James L. Knighten, Norman W. Smith, Ray Alexander Aug 2002

Transmission Line Modeling Of Vias In Differential Signals, Chen Wang, James L. Drewniak, Jun Fan, James L. Knighten, Norman W. Smith, Ray Alexander

Electrical and Computer Engineering Faculty Research & Creative Works

Signal layer transitions in differential lines are modeled using both FDTD and equivalent circuit methods. The equivalent circuit is developed based on transmission-line reasoning regarding via behavior. Parameters of each transmission-line segment are obtained based on its corresponding physical geometry. The mixed-mode S-parameters from the equivalent circuit and the FDTD modeling are compared. Good agreement is demonstrated in the frequency range from 1 GHz to 20 GHz. The results indicate that vias in differential lines can be modeled as a transmission line for a quick and easy engineering estimation of the differential signal behavior in an environment of signal layer …

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Evaluation And Carbon Fiber Reinforced Polymer Strengthening Of Existing Garage: Case Study, Milan Vatovec, Paul L. Kelley, Tarek Alkhrdaji, Antonio Nanni Aug 2002

Evaluation And Carbon Fiber Reinforced Polymer Strengthening Of Existing Garage: Case Study, Milan Vatovec, Paul L. Kelley, Tarek Alkhrdaji, Antonio Nanni

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The concrete-repair fiber reinforced polymer technology emerged in the United States during the past 10 years. Since 1995, carbon fiber reinforced polymer (CFRP) has been applied to strengthen concrete decks of a troubled posttensioned garage in Atlanta. During the construction of the garage, design deficiencies were found. A remedial repair, involving heavily reinforced, 7.6 cm (3 in.) thick Gunite (Shotcrete) beams, applied to the underside of the slab between drop panels in the east-west (E-W) direction, was developed in 1984. Since then, delamination of Gunite beams and other structural problems repeatedly occurred. Epoxy injection and other limited repairs were done …

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