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2001

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Articles 1 - 30 of 1774

Full-Text Articles in Engineering

Project Catalyst: Promoting Systemic Change In Engineering Education, Brian Hoyt, Michael Hanyak, Margot Vigeant, William Snyder, Maurice Aburdene, Daniel Hyde, E. Mastascusa, Michael Prince Nov 2012

Project Catalyst: Promoting Systemic Change In Engineering Education, Brian Hoyt, Michael Hanyak, Margot Vigeant, William Snyder, Maurice Aburdene, Daniel Hyde, E. Mastascusa, Michael Prince

Maurice Aburdene

No abstract provided.


Project Catalyst: Successes And Frustrations Of Introducing Systemic Change To Engineering Education, Michael Prince, Daniel Hyde, E. Mastascusa, Margot Vigeant, Michael Hanyak, Maurice Aburdene, Brian Hoyt, William Snyder Nov 2012

Project Catalyst: Successes And Frustrations Of Introducing Systemic Change To Engineering Education, Michael Prince, Daniel Hyde, E. Mastascusa, Margot Vigeant, Michael Hanyak, Maurice Aburdene, Brian Hoyt, William Snyder

Maurice Aburdene

No abstract provided.


Ocena Składu Gazów Odlotowych Z Procesów Spopielania Odpadów Niebezpiecznych Pod Kątem Trudności Oczyszczania I Toksyczności, Robert Oleniacz Dec 2001

Ocena Składu Gazów Odlotowych Z Procesów Spopielania Odpadów Niebezpiecznych Pod Kątem Trudności Oczyszczania I Toksyczności, Robert Oleniacz

Robert Oleniacz

Tightening of the European Union law in the field of the air emission limit values from waste incineration causes necessity for existing and new incineration plants to conform to the standards. It will often involve modernization of the flue gas cleaning system. Proposed in the paper the methodology of evaluation of the combustion gases composition in point of view cleaning difficulty should be useful to this end. Average toxicity factors for hazardous waste incineration flue gases were defined as well. Among other things they can be used in comparative analysis of the air pollutant concentration in the raw gas (before ...


University Of Nevada, Las Vegas Advanced Accelerator Applications University Participation Program: Quarterly Report, Third Quarter (September To November 2001), Anthony Hechanova Dec 2001

University Of Nevada, Las Vegas Advanced Accelerator Applications University Participation Program: Quarterly Report, Third Quarter (September To November 2001), Anthony Hechanova

Transmutation Research Program Reports (TRP)

This Quarterly Report is a primary deliverable from the University of Nevada, Las Vegas (UNLV) Advanced Accelerator Applications (AAA) University Participation Program (UPP) Director to the U.S. Department of Energy (DOE) as described in the UNLV AAA proposal and Statement of Work for the Third Quarter.

The UNLV AAA UPP Director implements the program’s administration using staff from the Harry Reid Center for Environmental Studies (HRC) to ensure that work conducted under the UNLV AAA UPP meets program objectives. The UNLV AAA UPP consists of three components: Program Support, Research Infrastructure Augmentation, and Student Research.


Localization Of Carriers And Polarization Effects In Quaternary Alingan Multiple Quantum Wells, E. Kuokstis, J. Zhang, M.-Y. Ryu, J. W. Yang, Grigory Simin, M. Asif Khan, R. Gaska, M. S. Shur Dec 2001

Localization Of Carriers And Polarization Effects In Quaternary Alingan Multiple Quantum Wells, E. Kuokstis, J. Zhang, M.-Y. Ryu, J. W. Yang, Grigory Simin, M. Asif Khan, R. Gaska, M. S. Shur

Faculty Publications

We report on observing a long-wavelength band in low-temperature photoluminescence(PL)spectrum of quaternary Al0.22In0.02Ga0.76N/Al0.38In0.01Ga0.61N multiple quantum wells(MQWs), which were grown over sapphire substrates by a pulsed atomic-layer epitaxy technique. By comparing the excitation-power density and temperature dependence of the PLspectra of MQWs and bulk quaternary AlInGaN layers, we show this emission band to arise from the carrier and/or exciton localization at the quantum well interface disorders. PL data for other radiative transitions in MQWs indicate that excitation-dependent spectra ...


Boron Carbide/N-Silicon Carbide Heterojunction Diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, Brian W. Robertson Dec 2001

Boron Carbide/N-Silicon Carbide Heterojunction Diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, Brian W. Robertson

Faculty Publications from Nebraska Center for Materials and Nanoscience

The fabrication, initial structural characterization, and diode measurements are reported for a boron carbide/silicon carbide heterojunction diode. Current–voltage curves are obtained for operation at temperatures from 24 to 351 °C. Plasma-enhanced chemical-vapor deposition (PECVD) -deposited undoped boron carbide material is highly crystalline and consists of a variety of polytypes of boron carbide (BC) with crystal sizes as large as 110 nm. Crystal phases are similar to those for PECVD BC on Si but only partially match known boron and boron-rich BC phases.


Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, Daniel W. Thompson, John A. Woollam, P. F. Williams, Supriyo Bandyopadhyay Dec 2001

Giant Photoresistivity And Optically Controlled Switching In Self-Assembled Nanowires, N. Kouklin, L. Menon, A. Z. Wong, Daniel W. Thompson, John A. Woollam, P. F. Williams, Supriyo Bandyopadhyay

Faculty Publications from the Department of Electrical and Computer Engineering

We report the observation of giant photoresistivity in electrochemically self-assembled CdS and ZnSe nanowires electrodeposited in a porous alumina film. The resistance of these nanowires increases by one to two orders of magnitude when exposed to infrared radiation, possibly because of real-space transfer of electrons from the nanowires into the surrounding alumina by photon absorption. This phenomenon has potential applications in ‘‘normally on’’ infrared photodetectors and optically controlled switches.


Sediment And Total Maximum Daily Loads, Mahdi Al-Kaisi, H. Mark Hanna, William Ehm, John Creswell, Michael J. Tidman Dec 2001

Sediment And Total Maximum Daily Loads, Mahdi Al-Kaisi, H. Mark Hanna, William Ehm, John Creswell, Michael J. Tidman

Integrated Crop Management News

An understanding of total maximum daily loads (TMDLs) is important when planning and implementing conservation practices. You need to define and plan for TMDLs as part of your farm's conservation plan. But you also need to consider all the land and farmers in the entire watershed, as well as the impact of management decisions that you and other farmers make on the whole watershed.


Radiation Transport Modeling Of Beam-Target Experiments For The Aaa Project: Quaterly Report, William Culbreth Dec 2001

Radiation Transport Modeling Of Beam-Target Experiments For The Aaa Project: Quaterly Report, William Culbreth

Reactor Campaign (TRP)

The national development of technology to transmute nuclear waste depends upon the generation of high energy neutrons produced by proton spallation. Proton accelerators, such as LANSCE at the Los Alamos National Laboratory, are capable of producing 800 MeV protons. By bombarding a lead/bismuth target, each proton may generate 500 or more neutrons that can activate fission products or induce the fission of transuranic isotopes.

The Monte Carlo radiation transport code MCNPX developed at LANL is an important tool in the design of transmuter technology. It must be validated, however, for the neutron energy that will be employed. Experiments are ...


Nuclear Criticality Analyses Of Separations Processes For The Transmutation Fuel Cycle: Quaterly Report, William Culbreth, Pang Tao Dec 2001

Nuclear Criticality Analyses Of Separations Processes For The Transmutation Fuel Cycle: Quaterly Report, William Culbreth, Pang Tao

Separations Campaign (TRP)

During the first quarter of the work, the tasks included training students in the use of Monte Carlo codes used in radiation transport studies and the assessment of neutron multiplication factors for specific problems outlined by ANL-East through Drs. Laidler and Vandegrift.

The proposal also included objectives for the first year of work on this project, as listed below. The work conducted in the first quarter of the project was in partial completion of these objectives.

• Train UNLV students in the use of SCALE and/or MCNP for the assessment of nuclear criticality.

• Assess neutron multiplication factor, keff, for ...


Horses Damp The Spring In Their Step, Alan M. Wilson, M. Polly Mcguigan, Anne Su, Antonie J. Van Den Bogert Dec 2001

Horses Damp The Spring In Their Step, Alan M. Wilson, M. Polly Mcguigan, Anne Su, Antonie J. Van Den Bogert

Mechanical Engineering Faculty Publications

The muscular work of galloping in horses is halved by storing and returning elastic strain energy in spring-like muscle–tendon units1, 2.These make the legs act like a child's pogo stick that is tuned to stretch and recoil at 2.5 strides per second. This mechanism is optimized by unique musculoskeletal adaptations: the digital flexor muscles have extremely short fibres and significant passive properties, whereas the tendons are very long and span several joints3, 4. Length change occurs by a stretching of the spring-like digital flexor tendons rather than through energetically expensive length changes in the ...


Ultraviolet Light-Emitting Diodes At 340 Nm Using Quaternary Alingan Multiple Quantum Wells, V. Adivarahan, A. Chitnis, J. P. Zhang, M. Shatalov, J. W. Yang, Grigory Simin, M. Asif Khan, R. Gaska, M. S. Shur Dec 2001

Ultraviolet Light-Emitting Diodes At 340 Nm Using Quaternary Alingan Multiple Quantum Wells, V. Adivarahan, A. Chitnis, J. P. Zhang, M. Shatalov, J. W. Yang, Grigory Simin, M. Asif Khan, R. Gaska, M. S. Shur

Faculty Publications

An ultraviolet light-emitting diode with peak emission wavelength at 340 nm is reported. The active layers of the device were comprised of quaternary AlInGaN/AlInGaN multiple quantum wells, which were deposited over sapphire substrates using a pulsed atomic-layer epitaxy process that allows precise control of the composition and thickness. A comparative study of devices over sapphire and SiC substrates was done to determine the influence of the epilayer design on the performance parameters and the role of substrate absorption.


Accuracy And Limitations Of Localized Green’S Function Methods For Materials Science Applications, Duane D. Johnson, Andrei V. Smirnov Dec 2001

Accuracy And Limitations Of Localized Green’S Function Methods For Materials Science Applications, Duane D. Johnson, Andrei V. Smirnov

Duane D. Johnson

We compare screened real-space and reciprocal-space implementations of Korringa-Kohn-Rostoker electronic-structure method for their applicability to largescale problems requiring various levels of accuracy. We show that real-space calculations in metals can become impractical to describe energies. We suggest a combined r- and k-space scheme as the most efficient and flexible strategy for accurate energy calculations. Our hybrid code is suitable for (parallel) large-scale calculations involving complex, multicomponent systems. We also discuss how details of numerical procedures can affect accuracy of such calculations.


Improving Anhydrous Ammonia Application Efficiency, H. Mark Hanna, Paul M. Boyd, Michael L. White, Thomas S. Colvin, James L. Baker Dec 2001

Improving Anhydrous Ammonia Application Efficiency, H. Mark Hanna, Paul M. Boyd, Michael L. White, Thomas S. Colvin, James L. Baker

Proceedings of the Integrated Crop Management Conference

Large amounts of commercial nitrogen fertilizer are applied to Iowa corn, and in other sections of the United States to additional crops such as wheat and cotton. Anhydrous ammonia is the most popular form of commercial nitrogen application. In preparation for the 1999 crop year, 1.4 billion pounds of nitrogen were applied as ammonia in Iowa and nine billion pounds were applied nationwide. Although crop rotation and manure utilization lessen the amount of off-farm purchased nitrogen, because of its low cost and existing distribution network, nitrogen in the form of anhydrous ammonia continues to be applied to many of ...


Hydrological, Chemical, And Management Factors Affecting Nitrogen Fate And Transport With Agricultural Drainage, James L. Baker Dec 2001

Hydrological, Chemical, And Management Factors Affecting Nitrogen Fate And Transport With Agricultural Drainage, James L. Baker

Proceedings of the Integrated Crop Management Conference

The issue of nitrogen (N) fate and transport, particularly nitrate-nitrogen (N03-N) leaching, and the resultant contamination of surface and groundwater resources is a continuing public concern. A recent newspaper editorial (July 1, 2001) in the Des Moines Register entitled "Nitrate madness," noted that N03-N can pose human health hazards relative to methemoglobamemia, certain forms of cancer, and miscarriages, as well as cause ecological damages such as hypoxia in the Gulf of Mexico. It was also noted that in Iowa, agriculture is a major source ofN03-N loss, but that: "A variety of means are available to reduce nitrates, but they need ...


Hybrid Transient-Parametric Method And System To Distinguish And Analyze Sources Of Acoustic Emission For Nondestructive Inspection And Structural, Health Monitoring, Yuris Dzenis Dec 2001

Hybrid Transient-Parametric Method And System To Distinguish And Analyze Sources Of Acoustic Emission For Nondestructive Inspection And Structural, Health Monitoring, Yuris Dzenis

Mechanical & Materials Engineering Faculty Publications

A nondestructive evaluation (NDE) technique for inspecting or health monitoring of Structures and/or Specimens by analyzing acoustic emission (AE) signals emitted by the Structures and/or specimens. The method and System ana lyzes acoustic emission (AE) signals emitted by structures and/or Specimens. AE Signals emitted by the Structures and/or Specimens are parametrically filtered as a function of parametric filters corresponding to characteristic waveforms of transient AE classes of predefined AE signals. In para metric analysis, the filtering may be pre- or post-recording. In transient AE analysis, the filtering may be prior to transient recording of the transient ...


On The Stability Of Unconstrained Receding Horizon Control With A General Terminal Cost, Ali Jadbabaie, John Hauser Dec 2001

On The Stability Of Unconstrained Receding Horizon Control With A General Terminal Cost, Ali Jadbabaie, John Hauser

Departmental Papers (ESE)

This paper deals with unconstrained receding horizon control of nonlinear systems with a general, non-negative terminal cost. Earlier results have indicated that when the terminal cost is a suitable local control Lyapunov function, the receding horizon scheme is stabilizing for any horizon length. In a recent paper, the authors show that there always exist a uniform horizon length which guarantees stability of the receding horizon scheme over any sub-level set of the finite horizon cost when the terminal cost is identically zero. In this paper, we extend this result to the case where the terminal cost is a general non-negative ...


Ua3/9/5 Partnerships For Progress: Linking Higher Education & Economic Development, Wku President's Office, Gary A. Ransdell Dec 2001

Ua3/9/5 Partnerships For Progress: Linking Higher Education & Economic Development, Wku President's Office, Gary A. Ransdell

WKU Archives Records

Speech delivered by WKU president Gary Ransdell at the National Governor's Association Center for Best Practices. In response to Governor Patton's challenges to create Programs of Distinction and enhance the state's capacity for economic development, we, at Western, have created a series of applied science centers. These centers are directing faculty talent toward creating a relevant curriculum in the sciences, toward solving environmental and material problems which limit economic development, and toward creating practice-based experiences for students. A by-product of these centers is a strengthened core curriculum which brings the applied sciences into focus for all WKU ...


Deconvolution Of Chirp Sidescan Sonar Data, Juliette W. Ioup, Maria T. Kalcic, Dale Bibee, Edit J. Kaminsky, George E. Ioup Dec 2001

Deconvolution Of Chirp Sidescan Sonar Data, Juliette W. Ioup, Maria T. Kalcic, Dale Bibee, Edit J. Kaminsky, George E. Ioup

Electrical Engineering Faculty Publications

No abstract provided.


Modeling And Control Of Formations Of Nonholonomic Mobile Robots, Jaydev P. Desai, James P. Ostrowski, R. Vijay Kumar Dec 2001

Modeling And Control Of Formations Of Nonholonomic Mobile Robots, Jaydev P. Desai, James P. Ostrowski, R. Vijay Kumar

Departmental Papers (MEAM)

This paper addresses the control of a team of nonholonomic mobile robots navigating in a terrain with obstacles while maintaining a desired formation and changing formations when required, using graph theory.We model the team as a triple, (g, r, H), consisting of a group element g that describes the gross position of the lead robot, a set of shape variables r that describe the relative positions of robots, and a control graph H that describes the behaviors of the robots in the formation. Our framework enables the representation and enumeration of possible control graphs and the coordination of transitions ...


Modeling And Control Of Formations Of Nonholonomic Mobile Robots, Jaydev P. Desai, James P. Ostrowski, Vijay Kumar Dec 2001

Modeling And Control Of Formations Of Nonholonomic Mobile Robots, Jaydev P. Desai, James P. Ostrowski, Vijay Kumar

Departmental Papers (MEAM)

This paper addresses the control of a team of nonholonomic mobile robots navigating in a terrain with obstacles while maintaining a desired formation and changing formations when required, using graph theory.We model the team as a triple, (g, r, H), consisting of a group element that describes the gross position of the lead robot, a set of shape variables g that describe the relative positions of robots, and a control graph H that describes the behaviors of the robots in the formation. Our framework enables the representation and enumeration of possible control graphs and the coordination of transitions between ...


Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson Dec 2001

Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson

Emeritus Faculty Author Gallery

No abstract provided.


A Neural Network-Based Approach For Control Of Capacitors Installed On Distribution Systems For Power Loss Reduction, Almoataz Youssef Abdelaziz Dec 2001

A Neural Network-Based Approach For Control Of Capacitors Installed On Distribution Systems For Power Loss Reduction, Almoataz Youssef Abdelaziz

Almoataz Youssef Abdelaziz

A neural network for capacitor switching in electric distribution systems for the purpose of power loss reduction is presented in this paper. An optimization technique (sensitive node method) for allocating the compensating capacitors is used to generate the training set patterns of the neural network. The required input data of the neural network at varying loading conditions are directly obtained from a load flow study of the distribution system. Load variations are assumed to follow a randomized function that generates a randomized matrix which is employed for implementing the different load levels. The developed neural network is based on a ...


Development Of Hiv Model And Its Simulation, D. K. Chaturvedi, Pritam Singh, S. K. Gaur, D. S. Mishra Dec 2001

Development Of Hiv Model And Its Simulation, D. K. Chaturvedi, Pritam Singh, S. K. Gaur, D. S. Mishra

D. K. Chaturvedi Dr.

The article discusses model developmetn for HIV infected population using the System Dynamics technique. The technique has an advantage over conventional modeling technique as it is dependent more on causal relationships that involve qualitative and quantitative variables to model socioeconomic problems of a complex nature. The model has been simulated and the results haven been compared witht he available data.


Acuta Enews December 2001, Vol.30, No. 12 Dec 2001

Acuta Enews December 2001, Vol.30, No. 12

ACUTA Newsletters

In This Issue

Michigan Tech Chooses Network Appliances

ACUTA Events

The "New Member Roundup"- Why It's Important

DC Update

ACUTA EVENTS

Mexico Dialing Pattern Change

Did the Lights Go Out? Events, Results, and Impacts

Board Report

Thanks to Our Sponsors!

Fourth Quarter 2001 Web Sites to See

Welcome New Members

Positions Available


Discovery Of Ghost Cavities In The X-Ray Atmosphere Of Abell 2597, B. R. Mcnamara, M. W. Wise, P. Nulsen, L. P. David, C. L. Carilli, C. L. Sarazin, C. P. O'Dea, J. Houck, M. Donahue, S. Baum, M. Voit, R. W. O'Connell, A. Koekemoer Dec 2001

Discovery Of Ghost Cavities In The X-Ray Atmosphere Of Abell 2597, B. R. Mcnamara, M. W. Wise, P. Nulsen, L. P. David, C. L. Carilli, C. L. Sarazin, C. P. O'Dea, J. Houck, M. Donahue, S. Baum, M. Voit, R. W. O'Connell, A. Koekemoer

Faculty of Engineering - Papers (Archive)

A Chandra image of the central 100 kpc of the Abell 2597 cluster of galaxies shows bright irregular X-ray emission within the central dominant cluster galaxy (CDG) and two low surface brightness cavities located 30 kpc from the nucleus of the CDG. Unlike the cavities commonly seen in other clusters, the "ghost" cavities in Abell 2597 are not coincident with the bright central radio source. Instead, they appear to be associated with faint extended radio emission seen in a deep Very Large Array radio map. We interpret the ghost cavities as buoyantly rising relics of a radio outburst that occurred ...


The Mystery Club: Those Mighty Machines, Charles V. Schwab, Laura J. Miller, Lynn Graham Dec 2001

The Mystery Club: Those Mighty Machines, Charles V. Schwab, Laura J. Miller, Lynn Graham

Agriculture and Environment Extension Publications

Farm safety newsletter and activities for youth, focusing on farm equipment, brought to you by Captain Overalls, safety crusader.


Automated Fault Detection In An Upflow Anaerobic Sludge Blanket Reactor: Comparisons Of Biogas Production And Physicochemical Quantities, Alexandra Maria Almeida Carvalho Pinto Dec 2001

Automated Fault Detection In An Upflow Anaerobic Sludge Blanket Reactor: Comparisons Of Biogas Production And Physicochemical Quantities, Alexandra Maria Almeida Carvalho Pinto

Doctoral Dissertations

A system capable of rapidly detecting toxic loads entering high-rate anaerobic reactors would greatly enhance their reliability, and could thereby increase their commercial acceptance. A high-rate anaerobic wastewater treatment process, called the failure-causing load detector (FCLD), consisting of a small (4-liter) upflow anaerobic sludge blanket (UASB) reactor having a short (10-min) hydraulic retention time (HRT), was used as a biosensor to rapidly detect potential problems with the influent wastewater. Sensors were used to monitor biogas production in the reactor, as well as pH, conductivity, and turbidity in the effluent from the reactor. The FCLD system was tested using the following ...


Development Of A Model For Predicting The Vertical Profile Of Ozone Based On Ground-Level Ozone Observations And Cloud Cover, Gi-Dong Kim Dec 2001

Development Of A Model For Predicting The Vertical Profile Of Ozone Based On Ground-Level Ozone Observations And Cloud Cover, Gi-Dong Kim

Doctoral Dissertations

Ozone formed in a chemical reaction is vertically dispersed and mixed with the ozone mass aloft by turbulent convection due to solar radiation. The mixing height, which depends on the stability of the atmosphere, varies by day/night time and by season of year and is characteristic of season and day and night time from year to year. Ground level ozone is generally the combined result of dynamics of the atmosphere resulted from the turbulent convection in the atmospheric boundary layer (ABL), production and destruction processes such as transport from upper air mass, subsequent transport to the ground, photochemical production ...


Acoustic Emission For Periodic Inspection Of Composite Pressure Vessels, Bao Rasebolai Mosinyi Dec 2001

Acoustic Emission For Periodic Inspection Of Composite Pressure Vessels, Bao Rasebolai Mosinyi

Theses - Daytona Beach

Cost savings can be achieved in a wide range of applications by replacing the current procedure for hydrostatic recertification of high-pressure composite gas cylinders with acoustic emission (AE) nondestructive testing. Advantages of AE recertification over the current hydrostatic method include: (1) no water contamination, since pressurization of the cylinders is done with air as opposed to water; (2) the risk of damage is decreased since the test pressure is reduced from 166% of design pressure to 110% of operating pressure; (3) the ability of acoustic emission to detect and locate flaws increases safety; and (4) the in-situ method will reduce ...