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Articles 1 - 25 of 25
Full-Text Articles in Entire DC Network
Characterization Of A Soil Bacterial Community And Biphenyl Dioxygenase Genes Involved In The Degradation Of Individual Polychlorinated Biphenyl Congeners, Paola Correa
Graduate Theses, Dissertations, and Problem Reports
Polychlorinated biphenyls (PCBs) are widespread, toxic, and persistent contaminants that threaten the environment and human health. PCBs represent a class of 209 congeners characterized by different degree of chlorination and substitution patterns. PCBs are known to be slowly degraded by the activity of soil microbes.;The general objective of this research was to investigate the effect of individual PCB congeners on the bacterial community and aerobic metabolism of PCBs in soil, for this reason three specific aims were pursuit.;The first specific aim was to test the hypothesis that exposure to individual PCB congeners results in different soil microbial community profiles, as …
Effect Of Compaction Effort On Superpave Base Course Materials, Cornelius Adamah
Effect Of Compaction Effort On Superpave Base Course Materials, Cornelius Adamah
Graduate Theses, Dissertations, and Problem Reports
SuperPave mixes have performed well with in West Virginia, especially with respects to permanent deformation. Recent studies raise concerns with premature fatigue cracking and difficulty in compaction during construction. Two base course mixes were tested by lowering compaction effort from 100 gyrations to 80 gyrations for the 19mm mix and to 65 gyrations for the 37.5 mm mix and evaluating rutting potential with Asphalt Pavement Analyzer and Indirect Tension test. Only gyration level and binder percent were changed. Lower compaction effort resulted in an increased binder content. The 19mm mixes showed an increased rutting potential. However, investigation of the data …
Assessing The Variation Of Driver Distraction With Experience, Nagaanupama Akuraju
Assessing The Variation Of Driver Distraction With Experience, Nagaanupama Akuraju
Graduate Theses, Dissertations, and Problem Reports
Driver distraction has been a major concern in highway safety. Driver distraction is related to crashes and crash rate varies with age. Driving experience obviously increases with age. The purpose of this study is to determine the relation between driver experience and distraction. The study measures the distraction levels of various drivers and assesses the variation in distraction based on experience and also gender.;Distraction was defined as looking away from the center of the roadway for more than 2 seconds. Factors like distraction duration, percent time spent looking at the center of roadway and number of glances away from the …
Levels Of Lateral Flange Bending In Straight, Skewed And Curved Steel I -Girder Bridges During Deck Placement, Nohemy Y. Galindez
Levels Of Lateral Flange Bending In Straight, Skewed And Curved Steel I -Girder Bridges During Deck Placement, Nohemy Y. Galindez
Graduate Theses, Dissertations, and Problem Reports
Exterior steel I-girders are required to withstand deck overhang loads during construction. This is partially accomplished by checking the flexural limit states for constructibility given by AASHTO. These limit states ensure that the maximum flange bending stresses produced during construction do not exceed the section flexural capacity of the girder.;For constructibility design, both the bending stresses and the flexural capacity of the flanges are affected by the loads corresponding to the deck placement sequence. Therefore, stiffness changes need to be considered during the various casting stages to compute the corresponding flange bending stresses and capacities. The specifications take into account …
Recycling Veneer-Mill Residues Into Engineered Products With Improved Torsional Rigidity, Brad Mcgraw
Recycling Veneer-Mill Residues Into Engineered Products With Improved Torsional Rigidity, Brad Mcgraw
Graduate Theses, Dissertations, and Problem Reports
The purpose of this research was to recycle veneer-mill residues from underutilized hardwood species into a value-added composite. These residues come from high quality logs and currently, are treated as waste. This study included the development of production methods of this new product. Using standard ASTM testing methods, an assessment into the physical and mechanical properties of the composite was performed.;The intended end use of these panels is as a web material in prefabricated I-joists. Composite I-joists were produced using flanges of structural composite lumber and a corrugated web. The purpose of the corrugated web was to increase the buckling …
Creep Rupture And Life Prediction Of Polymer Composites, Saurabh Batra
Creep Rupture And Life Prediction Of Polymer Composites, Saurabh Batra
Graduate Theses, Dissertations, and Problem Reports
Lack of long term performance data inhibits the widespread use of composites. The long-term response/performance of composite materials and structures exposed under service conditions (load, time, temperature, water, and others) must be established. Creep response under sustained load results in rupture but the time to rupture depends on environmental conditions. Creep rupture tests at higher fractions of ultimate failure load are often used to determine the time necessary to produce failure. Creep data are generated first in terms of deformation/strain versus time up to rupture for each test under a fraction of rupture load at a given temperature. Then the …
Versal Deformations Of Leibniz Algebra., Ashis Mandal Dr.
Versal Deformations Of Leibniz Algebra., Ashis Mandal Dr.
Doctoral Theses
No abstract provided.
Using Abet Assessment Requirements As A Catalyst For Change: Enhancing And Streamlining The Engineering Management Undergraduate Program At Missouri S&T, Stephen A. Raper, Susan L. Murray, Christa Moll Weisbrook, William Daughton
Using Abet Assessment Requirements As A Catalyst For Change: Enhancing And Streamlining The Engineering Management Undergraduate Program At Missouri S&T, Stephen A. Raper, Susan L. Murray, Christa Moll Weisbrook, William Daughton
Engineering Management and Systems Engineering Faculty Research & Creative Works
The Engineering Management (EM) undergraduate degree program at Missouri University of Science & Technology (formerly University of Missouri-Rolla) was the first program of its kind. The program started over 40 years ago and it is one of only five ABET accredited undergraduate EM programs [1]. The initial degree program included a senior year of management courses in conjunction with three years of courses in common engineering disciplines such as mechanical, electrical, and civil engineering. In the 1990s the program underwent a major restructure and students combined core engineering management classes with an emphasis area inside the department. Industrial, manufacturing, packaging, …
Paving The Way: Recruiting Students Into The Transportation Professions, Mti Report 08-03, Asha Weinstein Agrawal, Jennifer Dill
Paving The Way: Recruiting Students Into The Transportation Professions, Mti Report 08-03, Asha Weinstein Agrawal, Jennifer Dill
Mineta Transportation Institute
The transportation industry faces a growing shortage of professional engineers and planners. One key strategy in solving this problem will be to encourage more civil engineering and urban planning students to specialize in transportation while completing their degrees, so that employers have a larger pool of likely recruits. However, very little is known about how these students choose a specialization. To help fill that gap, this report examines the factors that lead civil engineering undergraduates and urban planning masters students to specialize in transportation, as opposed to other sub-disciplines within the two fields. The primary data collection methods were web-based …
Neurofuzzy Control To Address Stochastic Variation In Actuated-Coordinated Systems At Closely-Spaced Intersections, Xiaoli Sun
Doctoral Dissertations
This dissertation documents a method of addressing stochastic variation at closely-spaced signalized intersections using neurofuzzy control. Developed on the conventional actuated-coordinated control system, the neurofuzzy traffic signal control keeps the advantage of the conventional control system. Beyond this, the neurofuzzy signal control coordinates the coordinated phase with one of the non-coordinated phases with no reduction of the "green band" assigned to the coordination along the arterial, reduces variations of traffic signal times in the cycle caused by "early return to green", hence, makes more sufficient utilization of green time at closely-spaced intersections. The neurofuzzy signal control system manages a non-coordinated …
The Mechanical Characterization Of Polymeric Sandwich Materials For Marine Applications, Akawut Siriruk
The Mechanical Characterization Of Polymeric Sandwich Materials For Marine Applications, Akawut Siriruk
Doctoral Dissertations
The growing use of foam core composite sandwich structures has increased considerably in order to reduce the costs of acquisition and maintenance and to improve the operational performance for naval vessels. This study, which is the only one of its kind, focuses on understanding the properties and response of H100 PVC foam and carbon fiber vinyl/ester facing sandwich layups to static, dynamic, and cyclic loads in the presence of sea water, moisture, low temperature, and hydrostatic pressure. Several mechanical properties of both component materials have been identified. The degradations induced by sea water on foam, facing and sandwich were investigated, …
The Development And Evaluation Of A Detection Concept To Extend The Red Clearance By Predicting A Red Light Running Event, Jun Xu
Masters Theses
This study focuses on developing and evaluating a detection concept to extend the red clearance by predicting a RLR event. It will dynamically extend the red clearance several seconds when a RLR is predicted to happen otherwise zero. Therefore the time will be used more efficient. In order to evaluate the influence caused by alternative detector positions, a VISSIM network was built up, connecting Econolite ASC/3 controller and ATACID. Due to the lack of realistic data, all the data in this study are fictional, but close to real. Several parameters are artificially modified in order to gain larger RLR occurrence. …
Identifying Methods To Reduce Conflicts Between Automobiles And Bikes In China Using Microsimulation, Terrance Quashun Hill
Identifying Methods To Reduce Conflicts Between Automobiles And Bikes In China Using Microsimulation, Terrance Quashun Hill
Masters Theses
With an ever-expanding population and rapid modernization, China is faced with transportation related problems that are both familiar and foreign to the rest of the industrialized world. There is also a large increase in rural-urban migration, resulting in high income disparities and thus diverse transportation needs. While a small but growing percentage of the urban population is adopting automobiles, there are still many people who rely on two-wheel transportation. Engineers in many of the urban cities are facing challenges resulting from an increase in the number of conflicts between various forms of transportation including bicycles, buses, cars, electric bicycles, and …
Classification Of Subwatershed Slopes And Geotechnical Characterization Of Steep Slopes On Reclaimed Mine Lands In East Tennessee, Patrick Hamilton White
Classification Of Subwatershed Slopes And Geotechnical Characterization Of Steep Slopes On Reclaimed Mine Lands In East Tennessee, Patrick Hamilton White
Masters Theses
Mining and logging activity in the Appalachian region create both excessive runoff and sedimentation in local streams and rivers. Also, the Surface Mining Control and Reclamation Act of 1977 led to over compaction of mine spoil which has led to reclaimed mine lands which will not grow economically viable native hardwood forests. In recent years a construction technique known as low compaction grading has allowed for suitable tree growth but stability and sedimentation have not yet been explored. The purpose of this paper is to create a rapid assessment method to classify the characteristics of watersheds based upon their geomorphology, …
Plant And Laboratory Scale Studies Of High Performance Concrete For Bridge Decks In West Virginia, Santiago Velez
Plant And Laboratory Scale Studies Of High Performance Concrete For Bridge Decks In West Virginia, Santiago Velez
Graduate Theses, Dissertations, and Problem Reports
High-performance concrete (HPC) is increasingly used in bridge decks due to its high strength, superior durability and low maintenance resulting in durable and cost effective bridges. FHWA strongly recommended developing suitable HPC mixtures using local material sources and construction technologies for a specific location or state.;As part of a comprehensive R&D program, a field implementation of laboratory developed HPC mixtures was proposed. From a total of eight mixtures developed in the lab with w/cm=0.40, three HPC mixtures were selected using specific local aggregates, in addition to supplementary cementitious materials and chemical admixtures. From these mixtures, three test slabs were produced …
Studies On Construction And List Decoding Of Codes On Some Towers Of Function Fields., M. Prem Laxman Das Dr.
Studies On Construction And List Decoding Of Codes On Some Towers Of Function Fields., M. Prem Laxman Das Dr.
Doctoral Theses
In everyday life, there arise many situations where two parties, sender and receiver, need to communicate. The channel through which they communicate is assumed to be binary symmetric, that is, it changes 0 to 1 and vice versa with equal probability. At the receiver’s end, the sent message has to be recovered from the corrupted received word using some reasonable mechanism. This real life problem has attracted a lot of research in the past few decades. A solution to this problem is obtained by adding redundancy in a systematic manner to the message to construct a codeword. The collection of …
Placement And Range Assignment In Power-Aware Radio Networks., Gautam Kumar Das Dr.
Placement And Range Assignment In Power-Aware Radio Networks., Gautam Kumar Das Dr.
Doctoral Theses
Due to the extraordinary growth of demand in mobile communication facility, design of efficient systems for providing specialized services has become an important issue in wireless mobility research. Broadly speaking, there are two major models for wireless networking: single-hop and multi-hop. The single-hop model [110] is based on the cellular network, and it provides one-hop wireless connectivity between the host and the static nodes known as base stations. single-hop networks rely on a fixed backbone infrastructure that interconnects all the base stations by high speed wired links. On the other hand, the multi-hop model requires neither fixed wired infrastructure nor …
Enhancing Concrete Barrier Reflectivity With A Focus On Recycled Glass Aggregate Replacement, Regina Shklyan
Enhancing Concrete Barrier Reflectivity With A Focus On Recycled Glass Aggregate Replacement, Regina Shklyan
Masters Theses 1911 - February 2014
Increased accident rates during the nighttime and wet weather conditions on the United States highways necessitate the enhancement of highway concrete barrier visibility. The visibility of these delineators is dependent on their reflectivity. Several methods are proposed that stand to increase the reflectivity of these concrete barriers, such as the use of white cement versus gray cement and the attachment of raised pavement markers to the side of the barriers. The incorporation of recycled glass into the concrete mixture is one of the proposed methods that was put through further laboratory study. The aim of the laboratory testing was to …
Seismic Energy Dissipation Of Steel Buildings Using Engineered Cladding Systems, Quan Viet Nguyen
Seismic Energy Dissipation Of Steel Buildings Using Engineered Cladding Systems, Quan Viet Nguyen
Masters Theses 1911 - February 2014
This research examines the seismic energy dissipation potential of steel structures by focusing on new types of specially engineered cladding-to-frame connections. Traditional connection details consist of rigid restraints of cladding panels, resulting in seismic design that only considers the panel self-weight with connection design left up to the precast fabricators and typical details. It is postulated that by considering these elements to actively participate in building response a more efficient and resilient structure could be designed which accurately captures the effects of non-structural cladding elements on building behavior. In this preliminary research, two mechanisms to dissipate seismic energy using engineered …
Analytical Modeling Of Tree Vibration Generated During Cutting Process, Payman Karvanirabori
Analytical Modeling Of Tree Vibration Generated During Cutting Process, Payman Karvanirabori
Masters Theses 1911 - February 2014
There are several ways to cut down a tree. The piece by piece cutting method is studied in this research. By modeling the cutting process into simple dynamic models and obtaining governing equations of motion of tree and cut piece in each model, the forces during cutting process were calculated. The method was then applied to a set of real data and tree vibrations were compared with field measurements. The study is very rare in the case of the variety of the topics it covers from dynamics and mechanics to finite element modeling of a biological system.
An Investigation Of Students’ Conceptual Understanding In Related Sophomore To Graduate-Level Engineering And Mechanics Courses, Devlin Montfort, Shane Brown, David Pollock
An Investigation Of Students’ Conceptual Understanding In Related Sophomore To Graduate-Level Engineering And Mechanics Courses, Devlin Montfort, Shane Brown, David Pollock
Faculty Publications - Biomedical, Mechanical, and Civil Engineering
Interviews were conducted with students from a sophomore-level mechanics of materials class, a sophomore/junior-level structures class, a senior-level steel design class and a graduate-level advanced steel design class to investigate students’ conceptual understanding of bending and normal stress. The graduate students generally demonstrated higher computational skill and confidence but they were not significantly different from the sophomores in terms of conceptual understanding. Interestingly, the seniors showed markedly lower confidence in their ability to solve the problems posed in the interviews. Common difficulties include a conceptual definition of stress and reasoning involving the normal stresses developed under bending.
A Strength And Serviceability Assessment Of High Performance Steel Bridge 10462, Aaron G. Bertoldi
A Strength And Serviceability Assessment Of High Performance Steel Bridge 10462, Aaron G. Bertoldi
Graduate Theses, Dissertations, and Problem Reports
High performance steels (HPS) were developed through the cooperative efforts of the American Iron and Steel Institute (AISI), the US Navy, and the Federal Highway Administration (FHWA). They offer several advantages over conventional bridge steels including greater yield strengths, improved ductility, increased toughness, and better welding characteristics. The three grades of HPS that are currently available in today's bridge market are HPS 50W, 70W, and 100W. The current steel I-girder flexural capacity equations, however, were specifically developed for girders with nominal yield strengths less than or equal to 70 ksi. Because of this fact, the flexural capacities of I-girders incorporating …
Performance Evaluations Of Latex-Modified And Silica Fume Modified Concrete Overlays For Bridge Decks, Sathish Kumar Raju Konduru
Performance Evaluations Of Latex-Modified And Silica Fume Modified Concrete Overlays For Bridge Decks, Sathish Kumar Raju Konduru
Graduate Theses, Dissertations, and Problem Reports
Most of the concrete bridge decks in the cold regions undergo severe reinforcement corrosion due to the transport of chloride ions within the concrete by application of deicing salts on bridge decks in the winter. As a result, protective concrete overlays of about 2-inch thickness are applied on bridge decks. Concrete overlays provide: (1) protection against heavy traffic and the further infiltration of the chloride ions; (2) skid resistance surface; and (3) uniform appearance to extend the service life of bridge decks. Despite these advantages, concrete overlays undergo premature delaminations, edge curling, and corner lifting due to expansion/shrinkage of concrete, …
Local Agency Traffic Sign Retroreflectivity Case Study And Model Of Observed Traffic Sign Light Intensity, Mark L. Franz
Local Agency Traffic Sign Retroreflectivity Case Study And Model Of Observed Traffic Sign Light Intensity, Mark L. Franz
Graduate Theses, Dissertations, and Problem Reports
Despite the lower traffic volumes, nearly 50 percent of America's fatal motor vehicle crashes occur at night. A contributing factor to the higher fatality rate at night is the reduced ability of motorists to be informed by visual cues. Therefore, motorists often rely on traffic control devices (TCD) under dark conditions for information, warnings, and guidance. This study focused on the visibility of traffic signs under dark conditions.;The new MUTCD standards on traffic sign retroreflectivity have been promulgated to improve nighttime driving safety on all roads open to public travel. This includes roads under the jurisdiction of local road agencies …
Characteristics Of Turbulence And Design Of Solid Removal System In The Quiescent Zone Of An Aquaculture Raceway, Eric G. Fizer
Characteristics Of Turbulence And Design Of Solid Removal System In The Quiescent Zone Of An Aquaculture Raceway, Eric G. Fizer
Graduate Theses, Dissertations, and Problem Reports
An aquaculture raceway is a water carrying, open channel with a rectangular cross-section used to raise fish. The first objective of this research is to measure the flow characteristics within a small section of an aquaculture raceway system called the quiescent zone, and determine if the flow through the quiescent zone contains two-dimensional, fully developed, turbulent open channel flow characteristics. If any discrepancies exist, the cause or causes of the discrepancies are to be analyzed. The measured flow characteristics are intended to improve previous measurements taken in the quiescent zone of a rectangular aquaculture raceway system. The second objective is …