Engineering Commons^™

Corrosion Fatigue Crack Growth Behavior Of Aircraft Materials, Tarun Goswami, D. W. Hoeppner

Biomedical, Industrial & Human Factors Engineering Faculty Publications

The effects of test parameters on the corrosion fatigue crack growth behavior of structural materials have been examined in this paper. Test parameters such as stress ratio, frequency, hold time, temperature, pH level of the media, and other parameters are known to alter the corrosion fatigue crack growth rates in structural materials. Numerous laboratory test variables that affect the crack growth and/or corrosion growth rates, which in an operating environment of an aircraft are not characterized, are reviewed. A summary of such information may help determine the inspection intervals of the new and aged airplanes, perform the inspections, and develop …

Avoiding User Discomfort By Considering Paging Activity On The Workstations To Be Used By A Distributed Progam, Khalid Dawood Al-Dajani

Honors Capstones

No abstract provided.

The Down Survey Of Ireland, Frank Prendergast

Books/Book Chapters

No abstract provided.

The Short-Term Effects Of Mortars On Salt Movement In Stone, Simon H. Perry, Aidan Duffy

Articles

Salt-induced decay processes are one of the most important reasons for the decay of many stone buildings and monuments. This paper investigates the role played by masonry mortars in the movement of salts within Baumberger sandstone and Portland limestone. The methodology used involved the monitoring of stone units containing mortar joints which were exposed to a city-centre environment. Rain-water run-off was collected from the stone/mortar units during the exposure period; the units were subsequently destructively analysed. The methods of run-off and destructive sample analysis used included ion chromatography and atomic absorption spectrophotometry; stone and mortar samples were also analysed petrographically. …

Two Parallel Finite Queues With Simultaneous Services And Markovian Arrivals, Srinivas R. Chakravarthy, S. Thiagarajan

Industrial & Manufacturing Engineering Publications

In this paper, we consider a finite capacity single server queueing model with two buffers, A and B, of sizes K and N respectively. Messages arrive one at a time according to a Markovian arrival process. Messages that arrive at buffer A are of a different type from the messages that arrive at buffer B. Messages are processed according to the following rules: 1. When buffer A(B) has a message and buffer B(A) is empty, then one message from A(B) is processed by the server. 2. When both buffers, A and B, have messages, then two messages, one from A …

Nebraska Summary 280: Massey Ferguson 4370 And 4270 Diesel 12-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA

The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data.

EXPLANATION OF THE TEST PROCEDURES

Purpose

The purpose of …

Runoff Quality Responses To Cattle-Gazing Strategy And Grassed Buffer Zone Length, Dwayne R. Edwards, Brian T. Larsen, Teng T. Lim

KWRRI Research Reports

Grazed pastures represent a source of potential nonpoint pollution. In comparison to other nonpoint sources (e.g., row-cropped lands), relatively little information exists regarding possible magnitudes of pollution from grazed pasture; how that pollution is affected by weather, soil, management and other variables; and how the pollution can be minimized. The objective of this study was to assess how the quality of runoff from simulated grazed pasture is influenced by grazing duration (4-12 weeks), grazing strategy (no grazing, conventional grazing and rotational grazing), and by the use of grassed buffer strips (ranging in length from O to 18.3 m) installed down-slope …

Vegetative Filter Strip Removal Of Metals In Runoff From Poultry Litter-Amended Fescuegrass Plots, Dwayne R. Edwards, P. A. Moore Jr., Tommy C. Daniel, Puneet Srivastava, D. J. Nichols

Biosystems and Agricultural Engineering Faculty Publications

Runoff from land areas amended with poultry (Gallus gallus domesticus) manure can contain elevated concentrations of metals such as Cu, Fe, and Zn. Vegetative filter strips (VFS) can reduce runoff concentrations of animal manure components, but reported studies have typically focused on nutrients and solids rather than metals. This experiment assessed the impact of VFS length (0 to 12 m) on concentrations and mass losses of Cu, Fe, K, Na, Ni, and Zn in runoff from fescuegrass (Festuca arundinacea Schreb.) plots (1.5 m wide × 6 and 12 m long) treated with poultry litter. The runoff was produced from simulated …

Release Of Inorganic Material During Coal Devolatilization, Larry L. Baxter, Reginald E. Mitchell, Thomas H. Fletcher

Faculty Publications

Experimental results presented in this paper indicate that coal devolatilization products convectively remove a fraction of the nonvolatile components of inorganic material atomically dispersed in the coal matrix. Results from three facilities burning six different coals illustrate this mechanism of ash transformation and release from coal particles. Titanium is chosen to illustrate this type of mass release from coal particles on the basis of its low volatility and mode of occurrence in the coal. During moderate rates of devolatilization (10⁴ K/s heating rate), no significant loss of titanium is noted. At more rapid rates of heating/devolatilization (10⁵ K/s) …

The Effect Of Ultrasonic Frequency Upon Enhanced Killing Ofp. Aeruginosa Biofilms, Zhen Qian, Richard D. Sagers, William G. Pitt

Faculty Publications

It is widely recognized that the bacteria sequestered in a biofilm on a medical implant are much more resistant to antibiotics than their planktonic counterparts. Recent studies have shown that application of antibiotic along with low power ultrasound significantly increases the killing of planktonic bacteria by the antibiotic. Herein is reported a similar application of antibiotic and ultrasound to sessile bacteria in biofilms of Pseudomonas aeruginosa on a polyethylene substrate. Biofilm viability was measured after exposure to 12 μg/ml gentamicin sulfate and 10 mW/cm² ultrasound at frequencies of 70 kHz, 500 kHz, 2.25 MHz, and 10 MHz. The results …

Extracting The Grain Boundary Character/Free Energy Relationship From The Microstructure: Pure <100> And <111> Tilt Boundaries, Brent L. Adams, S. Costiner, D. Kinderlehrer, W. W. Mullins, Shlomo Ta'asan

Faculty Publications

This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-9632556. Analysis is described to extract the excess free energy of grain boundaries from the mesotexture of well-equilibrated polycrystalline samples. The approach is based upon the force and torque balances at triple junctions described in the classical work of Herring. The main advantage of the approach is that the free energy function is obtained over the full fundamental zone of grain boundary types. For the purposes of exposition, the method is described for specified two-parameter hypersurfaces in the fundamental zone for cubic polycrystals …

The People: The Least Accountable Branch, Marci A. Hamilton

Articles

No abstract provided.

Newspaper Recycling And Deinking, Reem Adel Fahmy Baher

Archived Theses and Dissertations

No abstract provided.

Byproduct Formation During The Reduction Of Tce By Zero-Valence Iron And Palladized Iron, Liyuan Liang, Nic Korte, J. D. Goodlaxson, Jay Clausen, Quintus Fernando, Rosy Muftikian

United States Department of Energy: Publications

Trichlorothene (TCE) was reduced with zero-valence iron and palladized iron in zero-head-space extractors. Progress of the reaction in these batch studies was monitered with purge-and-trap gas chromatography and a flame ionization detector. When a 5 ppm initial concentration of TCE reacts with zero-valence iron, approximately 140 ppb of vinyl chloride persists for as long as 73 days. The concentration of vinyl chloride (approximately 10 ppb) remaining with palladized iron is approximately and order of magnitude less than when zero-valence iron is the reductant. These data suggest that volatile byproducts may be under-represented in other published data regarding reduction in zero-valence …

School Of Computer And Information Sciences Master Of Science Degree Programs 1997, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Doctoral Degree Programs School Of Computer And Information Science 1997, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Investigation Of The Optical Properties Of Ordered Semiconductor Materials, Jack E. Mccrae Jr.

Theses and Dissertations

Optical studies have been conducted upon CdGeAs₂ and ZnGeP₂, two of the most promising semiconductors being developed for mid-infrared non-linear optics applications. These experiments included photoluminescence (PL) studies of both compounds as well as photoreflectance (PR) measurements upon CdGeAs₂. In addition, Hall effect measurements were carried out upon CdGeAs₂, to aid in interpretation of the optical data. PL was measured as a function of laser power, sample temperature, and crystal orientation for CdGeAs₂. One broad weak peak near 0.38 eV, and another somewhat narrower and often far brighter peak near 0.57 …

Manual Tracking Flight Control With Amplitude And Rate Constrained Dynamic Actuators, Russel B. Miller

Theses and Dissertations

A new control methodology for manual flight control, viz., real-time tracking control, is developed. Amplitude and rate constrained dynamic actuators are considered. Optimal tracking control is made possible by the use of unique reference signal prediction strategies which extrapolate the reference signal over the optimization horizon. A receding horizon, linear-quadratic inner-loop controller is employed in conjunction with an outer-loop nonlinear element. The constraint effects mitigation strategy is to optimally track a modified reference signal which yields feasible actuator commands over the optimization horizon when the pilot demanded reference is too aggressive to be tracked by the inner-loop optimal control law. …

Development Of A Congestion Management System For Indiana, Robert K. Whitford, Jennifer L. Opsuth

JTRP Technical Reports

This study details a procedure used in determinng links with deficiencies. A procedure was developed by means of which congestion on raodways links can be identified as being congested will be subjected to a more detailed study to determine extent, duration, and severity of congestion. The procedure was developed by the use of the Highway C apacity Manual (HCM) and the Indiana Department of Transportation's (INDOT) Road Inventory Data Base.

Freeway Incident Likelihood Prediction And Response Decision-Making, Samer Madanat, Hongyu Pan, Pen-Chi Liu, Hualiang Teng

JTRP Technical Reports

This research project consisted of two parts. The first part developed a set of real-time incident likelihood prediction models. The second part developed a freeway incident response decision-making methodology based on sequential hypothesis testing methods. The freeway incident likelihoods predicted by the real-time prediction models act as prior probabilities for the freeway incident response decision-making system. The products of this research project will be incorporated in the Advanced Traffic Management System that is being implemented on the Borman Expressway, a 16-mile segment of I-80 in northwest Indiana. The decision-making system can be used by traffic management personnel to assist in …

Minimum Crushed Aggregate Requirements, Haiming Huang, Thomas D. White

JTRP Technical Reports

An accelerated pavement testing facility has been developed by Purdue University for the Indiana Department of Transportation. The test facility includes a test pit in which prototype scale pavement sections can be installed. The Accelerated Pavement Tester loading system has the capability of applying moving wheel loads to the test sections. An initial study utilizing the accelerated pavement test facility has been conducted at Purdue University to determine the minimum crushed aggregate requirements in asphalt mixtures in Indiana. This study addresses effects of various constituents of the asphalt mixture on pavement rutting. The factors included in this study are aggregate …

Prediction Models For Incident Clearance Time For Borman Expressway (Vol. 1; Vol. 2: 96/11), Samer Madanat, Ahmed Feroze

JTRP Technical Reports

This research consisted of two parts; this report is Volume 1 of 2 Volumes; Volume 2 is Report No. FHWA/IN/JHRP-9611. The first part developed a set of incident clearance time prediction models for the Borman Expressway. The second part consisted of modeling driver’s route choice behavior under the influence of advanced traveler information systems. Volume 1 of this report describes the incident clearance time prediction models for the Borman Expressway. The prediction of incident clearance time from these models can facilitate in efficient incident management and support traveler information systems. The products of this research project will be incorporated in …

Testing Of Multi-Span Bridges With Full Span Precast Prestressed Concrete Panels (Phase 1), Robert J. Peterman, J. A. Ramirez

JTRP Technical Reports

The purpose of this study was to assess the behavior and durability of multi-span bridges constructed with full-span prestressed concrete form panels. The use of full-span prestressed concrete form panels for bridges with spans of 40 ft. or less is an economical method of construction due to the reduction of on-site formwork and labor required by alternate cast-in-place systems. In this research, a pair of two-span bridges utilizing full-span prestressed concrete form panels were fabricated and tested in the Karl H. Kettelhut Structural Engineering Laboratory at Purdue University. Time-dependent effects were monitored during the cast-in-place (CIP) concrete cure period of …

Study Of Side Ditch Liners For Highway Application, Anthony S. Calderon, Philippe L. Bourdeau

JTRP Technical Reports

Over the past few years, the INDOT new materials department has received numerous erosion control products (mostly geosynthetics) to evaluate as alternatives to riprap and concrete in ditch liners. Potential benefits include lower construction costs and better aesthetics over current products. Unfortunately, no specification, design methodology, or classification system currently exists for these erosion control blankets.

In this project's phase I, existing information and knowledge on erosion control materials used to line highway side drainage ditches were investigated. From the available technical1iterature (journal and conference publications, other DOTs specifications, manufacturer documentation, independent test laboratory test data), design methodologies, classification system, …

Automating Field Data Collection In Maintenance Operations, Bob G. Mccullouch

JTRP Technical Reports

Field data collection and management in DOT organizations requires a considerable amount of resources in the form of personnel and management systems. Recent studies performed by the researcher revealed that an average of 30-50% of some field supervisory personnel's time is spent on processing field data paperwork. This is a considerable amount of time spent on an undesirable task and is taking these employees away from more important job duties. This project automated two maintenance field data collection functions. One was a Crew Day Card, which is a card used by a maintenance crew to document the activity performed. Information …

Tests 1684 & 1730: Zetor 7341 Super/Zetor 7321 Super Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1734: Case Ih 8910 Diesel 18-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE

General

Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure.

The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Test 1733: John Deere 9420 24 Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Nebraska Summary: S306 Zetor 7341, Zetor 7321, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Test 1722: Caterpiller Challenger 75d Diesel 10-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …