Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Old Dominion University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2041 - 2070 of 4694

Full-Text Articles in Engineering

Secrecy Rates And Optimal Power Allocation For Full-Duplex Decode-And-Forward Relay Wire-Tap Channels, Lubna Elsaid, Leonardo Jimenez-Rodriguez, Nghi H. Tran, Sachin Shetty, Shivakumar Sastry Jan 2017

Secrecy Rates And Optimal Power Allocation For Full-Duplex Decode-And-Forward Relay Wire-Tap Channels, Lubna Elsaid, Leonardo Jimenez-Rodriguez, Nghi H. Tran, Sachin Shetty, Shivakumar Sastry

Computational Modeling & Simulation Engineering Faculty Publications

This paper investigates the secrecy rates and optimal power allocation schemes for a decode-and-forward wiretap relay channel where the transmission from a source to a destination is aided by a relay operating in a full-duplex (FD) mode under practical residual self-interference. By first considering static channels, we address the non-convex optimal power allocation problems between the source and relay nodes under individual and joint power constraints to establish closed-form solutions. An asymptotic analysis is then given to provide important insights on the derived power allocation solutions. Specifically, by using the method of dominant balance, it is demonstrated that full power …

Go to article

Sensitivity Analysis Method To Address User Disparities In The Analytic Hierarchy Process, Marie Ivanco, Gene Hou, Jennifer Michaeli Jan 2017

Sensitivity Analysis Method To Address User Disparities In The Analytic Hierarchy Process, Marie Ivanco, Gene Hou, Jennifer Michaeli

Mechanical & Aerospace Engineering Faculty Publications

Decision makers often face complex problems, which can seldom be addressed well without the use of structured analytical models. Mathematical models have been developed to streamline and facilitate decision making activities, and among these, the Analytic Hierarchy Process (AHP) constitutes one of the most utilized multi-criteria decision analysis methods. While AHP has been thoroughly researched and applied, the method still shows limitations in terms of addressing user profile disparities. A novel sensitivity analysis method based on local partial derivatives is presented here to address these limitations. This new methodology informs AHP users of which pairwise comparisons most impact the derived …

Go to article

Longitudinal Academic Performance Analysis Using A Two-Step Clustering Methodology, Volkan Cakir, Adrian Gheorghe Jan 2017

Longitudinal Academic Performance Analysis Using A Two-Step Clustering Methodology, Volkan Cakir, Adrian Gheorghe

Engineering Management & Systems Engineering Faculty Publications

The present study aims to examine the academic profiles of industrial engineering undergraduate students among a sample group of military college engineering students (N=276) in order to determine the factors impacting academic performance; to compare student groups that were identified by course scores, and to analyse performance changes over four academic years. The study started with data collection, database creation and preparation for clustering study. A two-step clustering methodology was used for grouping courses based on academic performance and context similarities. The clustering methodology results are validated by discriminant analysis. Student movements among clusters over the four years are identified …

Go to article

Systemic Intervention For Complex System Governance Development, Charles B. Keating, Polinpapilinho F. Katina,, John C. Pyne, Ra’Ed M. Jaradat Jan 2017

Systemic Intervention For Complex System Governance Development, Charles B. Keating, Polinpapilinho F. Katina,, John C. Pyne, Ra’Ed M. Jaradat

Engineering Management & Systems Engineering Faculty Publications

This paper explores the issues related to systemic intervention for Complex System Governance (CSG) development. Systemic intervention seeks to intentionally engage a system to influence trajectory or outcomes. CSG is an emerging field focused on the design, execution, and evolution of the functions necessary to provide continued system performance (stability) in the midst of incessant turbulence and increasing complexity. Integral to this field is the necessity to ‘intervene’ in a complex system to enhance system behavior, structure, or performance. Arguably, system interventions have an unremarkable record of success, ranging from declared success in improving a situation (system) to abysmal failure …

Go to article

Performance Degradation Analysis Of Aviation Hydraulic Piston Pump Based On Mixed Wear Theory, C. Zhang, S. Wang, M. Tomovic, L. Han Jan 2017

Performance Degradation Analysis Of Aviation Hydraulic Piston Pump Based On Mixed Wear Theory, C. Zhang, S. Wang, M. Tomovic, L. Han

Engineering Technology Faculty Publications

This paper focuses on the mathematical modeling of axial piston pump through dividing the failure development of friction pair into lubrication, mixed lubrication and abrasion. Directing to the wedge-shaped oil film between cylinder block and valve plate, the support force distribution under the temperature variance was obtained. Considering the rough peak of valve plate, the contact load model is built under plastic deformation and elastic deformation and the corresponding wear volume is calculated. Computing the wear and tear along the counter-clockwise, the total amount of friction and wear can be calculated. Simulation and preliminary wear particle monitoring test indicates that …

Go to article

Power Budgets For Cubesat Radios To Support Ground Communications And Inter-Satellite Links, Otilia Popescu Jan 2017

Power Budgets For Cubesat Radios To Support Ground Communications And Inter-Satellite Links, Otilia Popescu

Engineering Technology Faculty Publications

CubeSats are a class of pico-satellites that have emerged over the past decade as a cost-effective alternative to the traditional large satellites to provide space experimentation capabilities to universities and other types of small enterprises, which otherwise would be unable to carry them out due to cost constraints. An important consideration when planning CubeSat missions is the power budget required by the radio communication subsystem, which enables a CubeSat to exchange information with ground stations and/or other CubeSats in orbit. The power that a CubeSat can dedicate to the communication subsystem is limited by the hard constraints on the total …

Go to article

Institutionalizing Continuous Improvement Plan In An Engineering Technology Department- Closing The Loop, Alok K. Verma, Stephanie G. Adams, Cheng Y. Lin, Nestor Escobales, Isaac L. Flory Iv Jan 2017

Institutionalizing Continuous Improvement Plan In An Engineering Technology Department- Closing The Loop, Alok K. Verma, Stephanie G. Adams, Cheng Y. Lin, Nestor Escobales, Isaac L. Flory Iv

Engineering Technology Faculty Publications

Continuous improvement is a corner stone of a quality engineering or engineering technology program. Accreditation Board of Engineering and Technology requires that a well-planned and implemented continuous improvement plan should be in place. The ABET 2015-16 Criterion 4 Continuous Improvement1 states: "The program must regularly use appropriate, documented processes for assessing and evaluating the extent to which the student outcomes are being attained. The results of these evaluations must be systematically utilized as input for the continuous improvement of the program. Other available information may also be used to assist in the continuous improvement of the program." A successful continuous …

Go to article

A Mobile Platform Using Software Defined Radios For Wireless Communication Systems Experimentation, Otilia Popescu, Shiny Abraham, Samy El-Tawab Jan 2017

A Mobile Platform Using Software Defined Radios For Wireless Communication Systems Experimentation, Otilia Popescu, Shiny Abraham, Samy El-Tawab

Engineering Technology Faculty Publications

A distinctive feature of wireless communication systems is implied by the fact that there is no physical connection between the transmitter and its corresponding receiver, which enables user mobility. However, experimenting with wireless communication systems is mostly done in the lab, where transmitters and receivers are setup on benches, in stationary settings. This prevents students from experiencing fading and other propagation effects associated with mobile wireless channels. This paper describes a mobile platform for wireless communication experimentation that enables students to run experiments beyond the confines of a traditional lab, in realistic settings that cover indoor and outdoor scenarios with …

Go to article

Cryogenic Rf Test Of The First Srf Cavity Etched In An Rf Ar/Cl2 Plasma, J. Upadhyay, A. Palczewski, S. Popovic, A.-M. Valente-Feliciano, Do Im, H. L. Phillips, L. Vuskovic Jan 2017

Cryogenic Rf Test Of The First Srf Cavity Etched In An Rf Ar/Cl2 Plasma, J. Upadhyay, A. Palczewski, S. Popovic, A.-M. Valente-Feliciano, Do Im, H. L. Phillips, L. Vuskovic

Physics Faculty Publications

An apparatus and a method for etching of the inner surfaces of superconducting radio frequency (SRF) accelerator cavities are described. The apparatus is based on the reactive ion etching performed in an Ar/Cl2 cylindrical capacitive discharge with reversed asymmetry. To test the effect of the plasma etching on the cavity rf performance, a 1497 MHz single cell SRF cavity was used. The single cell cavity was mechanically polished and buffer chemically etched and then rf tested at cryogenic temperatures to provide a baseline characterization. The cavity's inner wall was then exposed to the capacitive discharge in a mixture of …

Go to article

On A Time Domain Boundary Integral Equation Formulation For Acoustic Scattering By Rigid Bodies In Uniform Mean Flow, Fang Q. Hu, Michelle E. Pizzo, Douglas M. Nark Jan 2017

On A Time Domain Boundary Integral Equation Formulation For Acoustic Scattering By Rigid Bodies In Uniform Mean Flow, Fang Q. Hu, Michelle E. Pizzo, Douglas M. Nark

Mathematics & Statistics Faculty Publications

It has been well-known that under the assumption of a uniform mean flow, the acoustic wave propagation equation can be formulated as a boundary integral equation. However, the constant mean flow assumption, while convenient for formulating the integral equation, does not satisfy the solid wall boundary condition wherever the body surface is not aligned with the assumed uniform flow. A customary boundary condition for rigid surfaces is that the normal acoustic velocity be zero. In this paper, a careful study of the acoustic energy conservation equation is presented that shows such a boundary condition would in fact lead to source …

Go to article

Human-Intelligence/Machine-Intelligence Decision Governance: An Analysis From Ontological Point Of View, Faisal Mahmud, Teddy Steven Cotter Jan 2017

Human-Intelligence/Machine-Intelligence Decision Governance: An Analysis From Ontological Point Of View, Faisal Mahmud, Teddy Steven Cotter

Engineering Management & Systems Engineering Faculty Publications

The increasing CPU power and memory capacity of computers, and now computing appliances, in the 21st century has allowed accelerated integration of artificial intelligence (AI) into organizational processes and everyday life. Artificial intelligence can now be found in a wide range of organizational processes including medical diagnosis, automated stock trading, integrated robotic production systems, telecommunications routing systems, and automobile fuzzy logic controllers. Self-driving automobiles are just the latest extension of AI. This thrust of AI into organizations and everyday life rests on the AI community’s unstated assumption that “…every aspect of human learning and intelligence could be so precisely described …

Go to article

Impacts Of Effective Temperature On Sectional View Drawing Ability And Implications For Engineering And Technology Education Students, Petros J. Katsioloudis Jan 2017

Impacts Of Effective Temperature On Sectional View Drawing Ability And Implications For Engineering And Technology Education Students, Petros J. Katsioloudis

STEMPS Faculty Publications

Temperature can influence thermal comfort, working performance, and social behavior. In a classroom that is slightly cool, an assumption can be made that learning could be affected in a negative way. Considering this, a quasi-experimental study was done to determine if a significant difference of effective temperature have an effect on students’: a) spatial visualization ability, as measured by the MCT and b) ability to sketch a sectional view drawing. While not statistically significant, the students who received treatment using warm water outperformed their peers who received treatment using cold and hot water temperatures, respectively.

Go to article

Use Of Virtual Reality Head-Mounted Displays For Engineering Technology Students And Implications On Spatial Visualization, Petros Katsioloudis, Mildred Jones, Vukica Jovanovic Jan 2017

Use Of Virtual Reality Head-Mounted Displays For Engineering Technology Students And Implications On Spatial Visualization, Petros Katsioloudis, Mildred Jones, Vukica Jovanovic

STEMPS Faculty Publications

Results from a number of studies indicate that the use of head-mounted displays can influence spatial visualization ability; however, research provides inconsistent results. Considering this, a quasi-experimental study was conducted to identify the existence of statistically significant effects on rotational view drawing ability due to the impacts of the displays. In particular, the study compared the use of three different types of displays; head-mounted, pc dynamic and 3D printed and whether a significant difference exists towards rotational view drawing ability, among engineering technology students. According to the results of this study it is suggested that the impact of the display …

Go to article

Integrative Experiences Through Modeling And Simulation Of Mechatronic Systems, Mileta Tomovic, Cynthia Tomovic, Vukica M. Jovanovic, Cheng Y. Lin, Nan Yao, Petros J. Katsioloudis Jan 2017

Integrative Experiences Through Modeling And Simulation Of Mechatronic Systems, Mileta Tomovic, Cynthia Tomovic, Vukica M. Jovanovic, Cheng Y. Lin, Nan Yao, Petros J. Katsioloudis

Engineering Technology Faculty Publications

Learning is integrative lifelong process which requires continuous refreshing of old material and learning new material. This principle holds also for student experiences during their undergraduate studies. Students learn new material throughout their studies, and they may or may not have opportunity to use the material in different context and at different levels. As a result some of the acquired knowledge may be forgotten by the time student graduates or it may not be placed in the context of the overall program outcomes, thus material presented may not seem to have relevance to student's career. An effective method to address …

Go to article

Applying Technology To Improve Student Learning Outcomes In Dynamics Course, Mileta Tomovic, Cynthia Tomovic, Vukica M. Jovanovic, Cheng Y. Lin, Nan Yao Jan 2017

Applying Technology To Improve Student Learning Outcomes In Dynamics Course, Mileta Tomovic, Cynthia Tomovic, Vukica M. Jovanovic, Cheng Y. Lin, Nan Yao

Engineering Technology Faculty Publications

Motivating and stimulating students to learn material in required core engineering courses is difficult and yet essential in assuring student success. Traditional methods of teaching and learning need to be reconsidered and modified to meet student expectations and their continuously evolving ways of interaction with technology and social networks. Numerous faculty have been experimenting with various approaches which are taking advantages of both technology and student interaction with technology, with various degrees of success. In this paper authors present another comprehensive method applied in teaching/learning of core engineering mechanics course. It has been observed over a long period of time …

Go to article

Developing A Faculty Learning Community To Support Writing Across Different Stem Disciplines, Vukica M. Jovanovic, Denise Tombolato-Terzic, Daniel P. Richards, Pilar Pazos, Megan Mckittrick, Julia Romberger, Otilia Popescu Jan 2017

Developing A Faculty Learning Community To Support Writing Across Different Stem Disciplines, Vukica M. Jovanovic, Denise Tombolato-Terzic, Daniel P. Richards, Pilar Pazos, Megan Mckittrick, Julia Romberger, Otilia Popescu

Engineering Technology Faculty Publications

Writing to learn is one of the very important pedagogical strategies in a variety of disciplines. This concept is not specifically addressed in the majority of engineering courses. Hence, university initiatives such as the Quality Enhancement Plan (QEP), emerging out of accreditation and institutional assessments, are focusing on infusing scholarship from other disciplines (in this case English) for the purpose of student learning improvement. Engineering and Science programs do include various courses in English Composition as the part of the curriculum; however, writing is not embedded in all discipline-specific courses at the upper-division level. The program outlined here focuses on …

Go to article

Developing A Curriculum For Marine Mechatronics Technicians, Vukica M. Jovanovic, Petros J. Katsioloudis, Ana Djuric, Mileta Tomovic, Thomas B. Stout Jan 2017

Developing A Curriculum For Marine Mechatronics Technicians, Vukica M. Jovanovic, Petros J. Katsioloudis, Ana Djuric, Mileta Tomovic, Thomas B. Stout

Engineering Technology Faculty Publications

A growing trend within the U.S. Navy is to streamline operations by deploying ships with less sailors, who are more highly skilled technicians that are trained to do a wide array of jobs. Modern ships also include various automated systems that require more highly skilled technicians for maintenance. Outdated warship designs are now being replaced with industrial grade automation equipment. Such equipment is being used in warships that encounter harsher environments than what exists in the civilian industry. Hence, there is a need for training in regards to industrial grade automation equipment for military and civilian ship repair partners. Marine …

Go to article

Flipped Classroom As Blended Learning In A Fluid Mechanics Course In Engineering Technology, Orlando M. Ayala, Otilia Popescu, Vukica M. Jovanovic Jan 2017

Flipped Classroom As Blended Learning In A Fluid Mechanics Course In Engineering Technology, Orlando M. Ayala, Otilia Popescu, Vukica M. Jovanovic

Engineering Technology Faculty Publications

Flipped classroom has gained attention in recent years as a teaching method in which the time allocated for introducing new concepts and the time used for practicing them are inverted, in order to provide more time for problem based learning and class interaction under direct supervision of the instructor. The implementation of this teaching method is comprised of two main components, the pre-class activities, which consist of individual student work and are largely based on pre-recorded videos, and in-class activities, which are group activities supervised by the instructor. This paper discusses the implementation of the flipped classroom method in a …

Go to article

Active Duty Training For Support Of Navy's Additive Manufacturing Strategy, Vukica M. Jovanovic, Onur Bilgen, Karina Arcaute, Michel A. Audette, Anthony W. Dean Jan 2017

Active Duty Training For Support Of Navy's Additive Manufacturing Strategy, Vukica M. Jovanovic, Onur Bilgen, Karina Arcaute, Michel A. Audette, Anthony W. Dean

Engineering Technology Faculty Publications

Additive manufacturing has recently gained the attention of multiple stakeholders, including those in the advanced manufacturing industry, research and government labs, academia, and the Navy community. Various efforts within the Navy focus on studying the best way for parts to be built and repaired for marine and naval vessels. Rapid manufacturing of spare components is particularly important for sailors, especially while deployed on warships, as they often do not have timely access to spare parts from the supply chain. For that purpose, a multidisciplinary team of engineering and education faculty have developed a series of workshops to train on-duty sailors …

Go to article

Learning Module On Electric Motors Modeling, Control, And Testing (Lm-Emmct), Ana Djuric, Vukica M. Jovanovic, Ece Yaprak, Wen Chen Jan 2017

Learning Module On Electric Motors Modeling, Control, And Testing (Lm-Emmct), Ana Djuric, Vukica M. Jovanovic, Ece Yaprak, Wen Chen

Engineering Technology Faculty Publications

The objective of this paper is to develop and integrate a learning module on Electric Motors Modeling, Control and Testing (EMMCT) into the Electrical Engineering Technology (EET) and Mechanical Engineering Technology (MET) programs. Preparing future engineers to work in highly automated production requires proper education and training in mechatronics theory and applications. Although Engineering Technology programs at various universities offer various courses related to the controls, electrical motors, and automation, they are not including the same methods when it comes to the selection of appropriate electrical motor for a specific application in mechatronic system. MET student do have exposure to …

Go to article

Green Infrastructure Training For Veterans, Carol L. Considine, Michael W. Seek, Jon Lester, Anthony W. Dean Jan 2017

Green Infrastructure Training For Veterans, Carol L. Considine, Michael W. Seek, Jon Lester, Anthony W. Dean

Engineering Technology Faculty Publications

The Environmental Protection Agency launched a Strategic Agenda to Protect Waters and Build More Livable Communities through Green Infrastructure in April of 2011. This initiative supports local communities in using green infrastructure to manage rain water while creating co-benefits of green space, which makes communities more attractive and livable. (EPA) In the fall of 2014 the Environmental Protection Agency along with the U.S. Department of Agriculture, U.S. Department of Defense, U.S. Department of Energy, U.S. Department of Housing and Urban Development, U.S. Department of the Interior and U.S. Department of Transportation signed a federal letter of support for green infrastructure …

Go to article

Hands-On Learning Environment And Educational Curriculum On Collaborative Robotics, Ana Djuric, Jeremy L. Rickli, Vukica M. Jovanovic, Daniel Foster Jan 2017

Hands-On Learning Environment And Educational Curriculum On Collaborative Robotics, Ana Djuric, Jeremy L. Rickli, Vukica M. Jovanovic, Daniel Foster

Engineering Technology Faculty Publications

The objective of this paper is to describe teaching modules developed at Wayne State University integrate collaborative robots into existing industrial automation curricula. This is in alignment with Oakland Community College and WSU’s desire to create the first industry-relevant learning program for the use of emerging collaborative robotics technology in advanced manufacturing systems. The various learning program components will prepare a career-ready workforce, train industry professionals, and educate academicians on new technologies. Preparing future engineers to work in highly automated production, requires proper education and training in CoBot theory and applications. Engineering and Engineering Technology at Wayne State University offer …

Go to article

Unite 3d Rover Summer Workshop: An Overview And Assessment, Steve C. Hsiung, Walter F. Deal, Francis Tuluri Jan 2017

Unite 3d Rover Summer Workshop: An Overview And Assessment, Steve C. Hsiung, Walter F. Deal, Francis Tuluri

Engineering Technology Faculty Publications

The article offers information about UNITE, a program sponsored by the U.S. Army Educational Outreach Program (AEOP, 2015). It mentions that the STEM Enrichment Activities of AEOP are designed to spark student interest in science, technology, engineering, and mathematics (STEM) especially among the underserved and those in earlier grades and educators by providing exciting, engaging, interactive, hands-on STEM experiences (USAEOP).

Go to article

Evaluating The Readability Of Radio Frequency Identification For Construction Materials, Younghan Jung, Michael M. Jeong Jan 2017

Evaluating The Readability Of Radio Frequency Identification For Construction Materials, Younghan Jung, Michael M. Jeong

Engineering Technology Faculty Publications

Radio Frequency Identification (RFID), which was originally introduced to improve material handling and speed production as part of supply chain management, has become a globally accepted technology that is now applied on many construction sites to facilitate real-time information visibility and traceability. This paper describes a senior undergraduate project for a Construction Management (CM) program that was specifically designed to give the students a greater insight into technical research in the CM area. The students were asked to determine whether it would be possible to utilize an RFID system capable of tracking tagged equipment, personnel and materials across an entire …

Go to article

Career And Technical Education And Its Relationship To Engineering Technology Pathways In Marine Mechatronics, Vukica M. Jovanovic, Otilia Popescu, Petros Katsioloudis, Ana M. Djuric, Mileta M. Tomovic, Thomas Stout, Roger R. Lagesse Jan 2017

Career And Technical Education And Its Relationship To Engineering Technology Pathways In Marine Mechatronics, Vukica M. Jovanovic, Otilia Popescu, Petros Katsioloudis, Ana M. Djuric, Mileta M. Tomovic, Thomas Stout, Roger R. Lagesse

Engineering Technology Faculty Publications

Students coming from families with low household incomes often cannot afford to rely on a regular pathway from high school to the university because of college tuition rates. Other students might not seek out available opportunities in their guidance counselors' offices to learn about existing scholarships or learn about different engineering technology or engineering careers. There are also students, who realize that a four-year university degree is not always necessary to find a career that matches their skills and talents. They may also have another educational path to receive a technician, engineering technology, or engineering degree, such as technical or …

Go to article

Impact Of Clip Connection And Insulation Thickness On Bracing Of Purlins In Standing Seam Roof Systems, Michael W. Seek, Daniel Mclaughlin Jan 2017

Impact Of Clip Connection And Insulation Thickness On Bracing Of Purlins In Standing Seam Roof Systems, Michael W. Seek, Daniel Mclaughlin

Engineering Technology Faculty Publications

The flexural strength of purlins in standing seam roof systems is highly dependent upon the extent to which the sheathing provides lateral and torsional restraint. Typical models to predict the restraint provided by the sheathing assume that the plane of lateral resistance occurs at the top flange of the purlin. In reality, depending on the configuration of the clip and the amount of insulation located between the purlin and the clip, the plane of lateral resistance and corresponding center of rotation shifts above the top flange. This distance, referred to as the effective standoff, is important to evaluate the effectiveness …

Go to article

Error Aggregation In The Reengineering Process From 3d Scanning To Printing, Jennifer G. Michaeli, Matthew C. Degroff, Roman C. Roxas Jan 2017

Error Aggregation In The Reengineering Process From 3d Scanning To Printing, Jennifer G. Michaeli, Matthew C. Degroff, Roman C. Roxas

Engineering Technology Faculty Publications

This work aims to study the aggregation of dimensional errors in the reengineering processes using 3D scanning and printing without initial design drawings. A 57-tooth spur gear is used as an example to facilitate the discussion. Two approaches are investigated. The first one builds the gear model based upon measurement taken from a caliper, and the second approach uses a 3D scanner to collect geometry data. Dimensional errors in each stage of these two approaches are investigated. Particular attention is paid to the geometry data flow in the reengineering process from data acquisition and editing to model construction. Recommendations are …

Go to article

Biochemical And Histological Differences Between Costal And Articular Cartilages, Michael W. Stacey Jan 2017

Biochemical And Histological Differences Between Costal And Articular Cartilages, Michael W. Stacey

Bioelectrics Publications

Biologically, costal cartilage is an understudied tissue type and much is yet to be learned regarding underlying mechanisms related to form and function, and how these relate to disease states, specifically chest wall deformity. Chest wall deformities have a component of inheritance, implying underlying genetic causes; however the complexity of inheritance suggests multiple genetic components. At our Centre investigations were performed on gene expression of key select genes from costal cartilage removed at surgery of patients with chest wall deformity to show high expression of decorin, a key player in collagen fiber formation and growth. Also, the degree of tissue …

Go to article

Design Of Electrical Layout Of Offshore Wind Farms, Shirshak K. Dhali, Mahidhar Nandigam Jan 2017

Design Of Electrical Layout Of Offshore Wind Farms, Shirshak K. Dhali, Mahidhar Nandigam

Electrical & Computer Engineering Faculty Publications

The cost and efficiency of offshore wind farms are determined by a variety of factors which include the type of electrical system (AC or DC), transmission length, transmission voltage, rated power, wind turbine type, farm topology, and wind speed. Since the design variable space is large for such problems, computational optimization is necessary to find an optimal solution. This paper discusses a design methodology to determine the optimal values of components to minimize the cost of an offshore wind farm. The cost, loss, reliability models, and the application of geometric programing for optimization of the layout and configuration of an …

Go to article

A New Formulation Of Time Boundary Integral Equation For Acoustic Wave Scattering In The Presence Of A Uniform Mean Flow, Fang Q. Hu, Michelle E. Pizzo, Douglas M. Nark Jan 2017

A New Formulation Of Time Boundary Integral Equation For Acoustic Wave Scattering In The Presence Of A Uniform Mean Flow, Fang Q. Hu, Michelle E. Pizzo, Douglas M. Nark

Mathematics & Statistics Faculty Publications

It has been well-known that under the assumption of a constant uniform mean flow, the acoustic wave propagation equation can be formulated as a boundary integral equation, in both the time domain and the frequency domain. Compared with solving partial differential equations, numerical methods based on the boundary integral equation have the advantage of a reduced spatial dimension and, hence, requiring only a surface mesh. However, the constant uniform mean flow assumption, while convenient for formulating the integral equation, does not satisfy the solid wall boundary condition wherever the body surface is not aligned with the uniform mean flow. In …

Go to article

First Prev Next Last