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Full-Text Articles in Engineering

Multi-Period Liner Ship Fleet Planning With Dependent Uncertain Container Shipment Demand, Qiang Meng, Tingsong Wang, Shuaian Wang Jun 2015

Multi-Period Liner Ship Fleet Planning With Dependent Uncertain Container Shipment Demand, Qiang Meng, Tingsong Wang, Shuaian Wang

Faculty of Engineering and Information Sciences - Papers

This paper deals with a realistic multi-period liner ship fleet planning problem by incorporating stochastic dependency of the random and period-dependent container shipment demand. This problem is formulated as a multi-period stochastic programming model with a sequence of interrelated two-stage stochastic programming (2SSP) problems characterized ship fleet planning in each single period. A solution method integrating dual decomposition and Lagrangian relaxation method is designed for solving the developed model. Numerical experiments are carried out to assess applicability and performance of the proposed model and solution algorithm. The results further demonstrate importance of stochastic dependence of the uncertain container shipment demand.


Understanding The Methods Behind Cyber Terrorism, Maurice E. Dawson Jr., Marwan Omar, Jonathan Abramson Jan 2015

Understanding The Methods Behind Cyber Terrorism, Maurice E. Dawson Jr., Marwan Omar, Jonathan Abramson

Maurice Dawson

Cyber security has become a matter of national, international, economic, and societal importance that affects multiple nations (Walker, 2012). Since the 1990s users have exploited vulnerabilities to gain access to networks for malicious purposes. In recent years the number of attacks on U.S. networks has continued to grow at an exponential rate. This includes malicious embedded code, exploitation of backdoors, and more. These attacks can be initiated from anywhere in the world from behind a computer with a masked Internet Protocol (IP) address. This type of warfare, cyber warfare, changes the landscape of war itself (Beidleman, 2009). This type ...


A Study Of The Behaviour Of Fresh And Coal Fouled Ballast Reinforced By Geogrid Using The Discrete Element Method, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn Jan 2015

A Study Of The Behaviour Of Fresh And Coal Fouled Ballast Reinforced By Geogrid Using The Discrete Element Method, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers

Geogrids are widely used in ballasted rail tracks for reinforcement and stabilisation. During train operation, ballast becomes contaminated or fouled due to infiltration of fines from the surface, mud pumping from the subgrade, and degradation, which decreases the performance of the geogrids. This paper presents the results of a laboratory and numerical simulation to study the effect that coal fines have on the interface between ballast and geogrid. The stress-strain behaviour of fresh and fouled ballast reinforced by geogrid was investigated via a series of large scale direct shear tests in the laboratory and numerical simulations using the Discrete Element ...


Electronic Supplement: Value Focused Thinking For Community-Based Organizations: Objectives And Acceptance In Local Development, Jeffrey Keisler, David A. Turcotte, Rachel B. Drew, Michael P. Johnson Jr. Jan 2015

Electronic Supplement: Value Focused Thinking For Community-Based Organizations: Objectives And Acceptance In Local Development, Jeffrey Keisler, David A. Turcotte, Rachel B. Drew, Michael P. Johnson Jr.

Michael P. Johnson

This is an electronic supplement to the manuscript "Value Focused Thinking for Community-Based Organizations: Objectives and Acceptance in Local Development", to appear in European Journal of Decision Processes.


Micro Sheet Hydroforming Process Of Ultra-Thin Pure Titanium Foil, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang, Daiki Kondo Jan 2015

Micro Sheet Hydroforming Process Of Ultra-Thin Pure Titanium Foil, Hideki Sato, Kenichi Manabe, Dongbin Wei, Zhengyi Jiang, Daiki Kondo

Faculty of Engineering and Information Sciences - Papers

A micro hydromechanical deep drawing is carried out using the pure titanium and the effect of fluid pressure on formability of pure titanium is investigated. The experiments are performed using the two kinds of pure titanium foils (TR270C-H and TR270C-O) and stainless steel foil (SUS304-H) with 50 thickness and the cylindrical and conical punches. As a result, it is found that the peeling off the oxide film of pure titanium can be reduced by applying the fluid pressure because the friction force and contact pressure between the blank and die decreases. However, the formability is lower for pure titanium than ...


Advances In Technology Project Management: Review Of Open Source Software Integration, Maurice Dawson, Brian Leonard, Emad Rahim Jan 2015

Advances In Technology Project Management: Review Of Open Source Software Integration, Maurice Dawson, Brian Leonard, Emad Rahim

Maurice Dawson

As organizations must continually drive down costs of software-driven projects, they need to evaluate the Systems Development Life Cycle (SDLC) and other software-based design methodologies. These methodologies include looking at software-based alternatives that could save a significant amount of money by reducing the amount of proprietary software. This chapter explores the use and integration of Open Source Software (OSS) in software-driven projects to include in enterprise organizations. Additionally, the legalities of the GNU General Public License (GPL), Lesser General Public License (LGPL), Berkeley Software Distribution (BSD), and Creative Commons are explored with the integration of these OSS solutions into organizations ...


Sonocatalytic Removal Of An Organic Dye Using Tio2/Montmorillonite Nanocomposite, A.R. Khataee, M. Sheydaei, A. Hassani, M. Taseidifar, S. Karaca Jan 2015

Sonocatalytic Removal Of An Organic Dye Using Tio2/Montmorillonite Nanocomposite, A.R. Khataee, M. Sheydaei, A. Hassani, M. Taseidifar, S. Karaca

Aydin Hassani

No abstract provided.


Influence Of Loading Conditions During Tensile Testing On Acoustic Emission, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu Jan 2015

Influence Of Loading Conditions During Tensile Testing On Acoustic Emission, Turbadrakh Chuluunbat, Cheng Lu, Andrii Kostryzhev, A Kiet Tieu

Faculty of Engineering and Information Sciences - Papers

The Acoustic Emission (AE) monitoring technique is widely used in mechanical and material research for detection of plastic deformation, fracture initiation and crack growth. However, the influence of AE features (such as signal amplitude, frequency, rise time and duration) on the fracture parameters (such as brittle or ductile mode of propagation and fracture propagation speed) is not completely understood. In this paper, the effect of loading conditions on fracture behavior was studied using AE monitoring during tensile testing of an aluminum alloy specimen. The fracture development was observed using a high speed video camera and was analyzed using the finite ...


Microgrid Capability Diagram: A Tool For Optimal Grid-Tied Operation, Athmi Jayawardena, Lasantha Meegahapola, Duane A. Robinson, Sarath Perera Jan 2015

Microgrid Capability Diagram: A Tool For Optimal Grid-Tied Operation, Athmi Jayawardena, Lasantha Meegahapola, Duane A. Robinson, Sarath Perera

Faculty of Engineering and Information Sciences - Papers

The microgrid paradigm has gained much interest in the electricity industry due to the increased penetration of distributed resources. A grid-tied microgrid can be viewed as a single generating entity or a load depending on its power export and import at the grid supply point. Similar to conventional generators, grid-tied microgrids have the potential to be able to participate in the energy market in the future to achieve technical, financial and environmental benefits. Effective participation in the energy markets requires numerous planning tools and a comprehensive understanding of the full capability of the microgrid. This paper presents a systematic approach ...


A Reversible And Stable Flake-Like Licoo2 Cathode For Lithium Ion Batteries, Tao Wei, Rui Zeng, Yongming Sun, Yunhui Huang, Kevin Huang Dec 2014

A Reversible And Stable Flake-Like Licoo2 Cathode For Lithium Ion Batteries, Tao Wei, Rui Zeng, Yongming Sun, Yunhui Huang, Kevin Huang

Faculty Publications

A dense and thick flake-like cathode structure was demonstrated to have a preferential crystallographic orientation for Li+ migration and a better tolerance to cracking, both of which enable a reversible and stable capacity at moderate rates from 0.1 to 2 C.


Applicability Of Fluidized Bed Reactor In Recalcitrant Compound Degradation Through Advanced Oxidation Processes: A Review, Abdul Aziz Abdul Raman Dec 2014

Applicability Of Fluidized Bed Reactor In Recalcitrant Compound Degradation Through Advanced Oxidation Processes: A Review, Abdul Aziz Abdul Raman

Abdul Aziz Abdul Raman

Treatment of industrial waste water (e.g. textile waste water, phenol waste water, pharmaceutical etc) faces limitation in conventional treatment procedures. Advanced oxidation processes (AOPs) do not suffer from the limits of conventional treatment processes and consequently degrade toxic pollutants more efficiently. Complexity is faced in eradicating the restrictions of AOPs such as sludge formation, toxic intermediates formation and high requirement for oxidants. Increased mass-transfer in AOPs is an alternate solution to this problem. AOPs combined with Fluidized bed reactor (FBR) can be a potential choice compared to fixed bed or moving bed reactor, as AOP catalysts life-span last for ...


Realization (Part 6), Mahdiyeh Eslami (مهدیه اسلامی) Dec 2014

Realization (Part 6), Mahdiyeh Eslami (مهدیه اسلامی)

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.


A Novel Transport Based Model For Wire Media And Its Application To Scattering Problems, Ebrahim Forati Dec 2014

A Novel Transport Based Model For Wire Media And Its Application To Scattering Problems, Ebrahim Forati

Theses and Dissertations

Artificially engineered materials, known as metamaterials, have attracted the interest of researchers because of the potential for novel applications. Effective modeling of metamaterials is a crucial step for analyzing and synthesizing devices. In this thesis, we focus on wire medium (both isotropic and uniaxial) and validate a novel transport based model for them.

Scattering problems involving wire media are computationally intensive due to the spatially dispersive nature of homogenized wire media. However, it will be shown that using the new model to solve scattering problems can simplify the calculations a great deal.

For scattering problems, an integro-differential equation based on ...


A Comparative Study Of Generalized Arc-Consistency Algorithms, Olufikayo S. Adetunji Dec 2014

A Comparative Study Of Generalized Arc-Consistency Algorithms, Olufikayo S. Adetunji

Computer Science and Engineering: Theses, Dissertations, and Student Research

In this thesis, we study several algorithms for enforcing Generalized Arc­-Consistency (GAC), which is the most popular consistency property for solving Constraint Satisfaction Problems (CSPs) with backtrack search. The popularity of such algorithms stems from their relative low cost and effectiveness in improving the performance of search. Virtually all commercial and public- domain constraint solvers include some implementation of a generic GAC algorithm. In recent years, several algorithms for enforcing GAC have been proposed in the literature that relies on increasingly complex data structures and mechanisms to improve performance. In this thesis, we study, assess, and compare a basic ...


Observability (Part 5), Mahdiyeh Eslami (مهدیه اسلامی) Nov 2014

Observability (Part 5), Mahdiyeh Eslami (مهدیه اسلامی)

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.


Controllability (Part 4), Mahdiyeh Eslami (مهدیه اسلامی) Nov 2014

Controllability (Part 4), Mahdiyeh Eslami (مهدیه اسلامی)

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.


13 - تأثیر نفوذ هوا از درزهای پنجره بر عملکرد سیستم گرمایش قرنیزی و شرایط آسایش حرارتی ساکنان, Alireza Zolfaghari, Bahman Sekhavatmand Nov 2014

13 - تأثیر نفوذ هوا از درزهای پنجره بر عملکرد سیستم گرمایش قرنیزی و شرایط آسایش حرارتی ساکنان, Alireza Zolfaghari, Bahman Sekhavatmand

Dr Alireza Zolfaghari

No abstract provided.


Linear Systems Theory (Part 3), Mahdiyeh Eslami (مهدیه اسلامی) Oct 2014

Linear Systems Theory (Part 3), Mahdiyeh Eslami (مهدیه اسلامی)

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.


Seismic Retrofitting Of Existing Structures, Cetin Sahin Oct 2014

Seismic Retrofitting Of Existing Structures, Cetin Sahin

Civil and Environmental Engineering Master's Project Reports

This research project will give a brief presentation about earthquake resistant design and the methodology about seismic evaluation and rehabilitation of existing structures. It also provides certain aspects of computer software modeling against seismic loads and shows the necessity of seismic upgrading in a steel moment-frame building.

The seismic evaluation process consists of investigating if the structure meets the defined target structural performance levels. The main goal during earthquakes is to assure that building collapse doesn’t occur and the risk of death or injury to people is minimized and beyond that to satisfy post-earthquake performance level for defined range ...


Improving Airplane Touchdown Control By Utilizing The Adverse Elevator Effect, Nihad E. Daidzic Ph.D., Sc.D. Oct 2014

Improving Airplane Touchdown Control By Utilizing The Adverse Elevator Effect, Nihad E. Daidzic Ph.D., Sc.D.

International Journal of Aviation, Aeronautics, and Aerospace

The main objective of this original research article is to understand the short-term dynamic behavior of the transport-category airplane during landing flare elevator control application. Increasing the pitch angle to arrest the sink rate, the elevator will have to produce negative lift to rotate the airplane’s nose upward. This has an immediate adverse effect of initially accelerating airplane downward. A mathematical model of landing flare based on the flat-Earth longitudinal dynamics of rigid airplane was developed which is realistic only on very short time-scales as pitch stiffness and damping were neglected. Pilot control scenarios using impulse and step elevator ...


Spatial Skills As Predictors Of Success In First-Year Engineering, Sheryl Sorby, Edmund Nevin, Avril Behan, Eileen Mageean, Sarah Sheridan Oct 2014

Spatial Skills As Predictors Of Success In First-Year Engineering, Sheryl Sorby, Edmund Nevin, Avril Behan, Eileen Mageean, Sarah Sheridan

Conference Papers

Numerous research studies have highlighted the importance of well-developed 3-D spatial skills for success in STEM related programs. Poor spatial skills, particularly among first-year students, can place them at a distinct disadvantage when completing introductory courses in mathematics, CAD, descriptive geometry, and graphic communications - first-year requirements in many STEM related programs. This in turn can lead to poor grades and retention issues. Women are disproportionally among the group of students with weak or poorly developed 3-D spatial skills meaning that they are at a greater risk of leaving engineering when compared to their male counterparts. In this study, the spatial ...


Nyiso – Selected Topics, Dejan Sobajic Oct 2014

Nyiso – Selected Topics, Dejan Sobajic

Modeling, Simulation, And Optimization for the 21st Century Electric Power Grid

No abstract provided.


The Figure Of Bitu-Man, Paul Royster Oct 2014

The Figure Of Bitu-Man, Paul Royster

Faculty Publications, UNL Libraries

The ominously imposing figure in the above illustration is “the Syncrude bird deterrent device, locally known as ‘Bitu-man’.” He stands (or stood—the original image was from the late 1970s) in the tailings pond of the Syncrude Canada Ltd. oil sands mining operation along the Athabasca River near Fort McMurray in northeastern Alberta. That operation surface mines (i.e., strip mines) bitumen-impregnated sand, processes it with hot water and steam, and discharges the liquid effluent or “tailings” into a pond covering roughly 3000 hectares (11 square miles). (Google Map coordinates: 56.9°N, -111.3° W). Residue bitumen collects on ...


Strategy Design For Community Response To Distress And Decline Using Data Analytics, Michael P. Johnson Jr. Oct 2014

Strategy Design For Community Response To Distress And Decline Using Data Analytics, Michael P. Johnson Jr.

Michael P. Johnson

The foreclosure crisis in the U.S. has resulted in immense economic and social losses for individuals and neighborhoods. Some neighborhoods face long-term declines in population and economic activity that have been compounded by the foreclosure crisis. How can government and non-profit organizations design responses to neighborhood distress that reflect distinctive community characteristics and are consistent with long-term policy and planning goals? In this talk, I discuss alternative decision modeling strategies that support neighborhood health. Where foreclosure responses are likely to ensure that neighborhoods remain vital places for residential housing, productive strategies may include property acquisition and redevelopment. Other neighborhoods ...


Effect Of Plasticizer On Oxygen Permeability Of Cast Polylactic Acid (Pla) Films Determined Using Dynamic Accumulation Method, Kurniawan Yuniarto, Bruce A. Welt, Aris Purwanto, Hadi Karia Purwadaria, Ayman Abdellatief, Titi C. Sunarti, Setyo Purwanto Oct 2014

Effect Of Plasticizer On Oxygen Permeability Of Cast Polylactic Acid (Pla) Films Determined Using Dynamic Accumulation Method, Kurniawan Yuniarto, Bruce A. Welt, Aris Purwanto, Hadi Karia Purwadaria, Ayman Abdellatief, Titi C. Sunarti, Setyo Purwanto

Journal of Applied Packaging Research

Polylactic acid (PLA) is becoming an increasingly important biopolymer for packaging applications. PLA brittleness limits its applicability. This study evaluated PLA properties with increasing amounts of added polyethylene glycol (PEG) plasticizer. Oxygen transmission rate (OTR) of cast films was determined using the newly available Dynamic Accumulation (DA) method. Arrhenius temperature sensitivity of OTR and polymer Permeability was also determined. Permeability of neat PLA is 4.848 ml mm (STP)/m2 s kPa; hence, 4.84 ml mm (STP)/m2 s kPa, 4.07 ml mm (STP)/m2 s kPa and 5.42 ml mm (STP)/m2 ...


Linear Systems Theory(Part 2), Mahdiyeh Eslami (مهدیه اسلامی) Oct 2014

Linear Systems Theory(Part 2), Mahdiyeh Eslami (مهدیه اسلامی)

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.


Quantifying Cognitive Processes In Virtual Learning Simulations, Michael Thornton, Gretchen A. Mosher Oct 2014

Quantifying Cognitive Processes In Virtual Learning Simulations, Michael Thornton, Gretchen A. Mosher

2014 ASEE North Midwest Section Conference

Virtual learning simulations have received increasing attention due various proposed educational, instructional, and institutional advantages; with literature focusing largely on perceptions of this technology and empirical comparisons to other instructional methods. Compared to traditional learning environments, virtual learning environments may present methodological advantages in studying learning processes through applying behavioral tracing techniques.

This paper will discuss behavioral indicators of cognitive learning processes used in virtual decision scenarios designed for third year engineering and engineering technology students. Behavioral measures to quantitatively analyze the learning process will be presented. Implications for assessing student learning, instructional strategy selection, and improving higher education quality ...


Mentoring Program, David W. Murhammer Oct 2014

Mentoring Program, David W. Murhammer

2014 ASEE North Midwest Section Conference

The Department of Chemical and Biochemical Engineering at the University of Iowa initiated a mentorship program during the 2012-13 academic year. This program involves pairing professional chemical engineers with a minimum of 5 years post-BS experience with chemical engineering sophomores. The resulting mentor-mentee relationships are intended to continue through graduation. The intent of this program is for the mentors to contribute to the professional preparation of the students for a successful career by interactively supplementing the students’ formal education with the mentor’s knowledge, experience, and counsel. This includes individualized help with career planning, resume preparation, interviewing savvy, internships, networking ...


Multiple Learning Strategies And Assessments Used In An Online Technology, Society & Ethics Course, Byron Garry Oct 2014

Multiple Learning Strategies And Assessments Used In An Online Technology, Society & Ethics Course, Byron Garry

2014 ASEE North Midwest Section Conference

The author of this article has taught Electronics Engineering Technology courses for 20+ years, mostly in a classroom face-to-face setting. The assessment of student learning depends mostly on the evaluation of how well the students have learned the theory-based, numerically-involved, and hands-on applications of each course’s content. For the past three summers, the author has also taught an on-line course entitled Technology, Society & Ethics. This kind of course calls for an emphasis on discussion and student writing, which requires a very different style of teaching and assessment than the instructor had used in the past. As a preparation for teaching the course for the first time, the learning outcomes of the course were developed before the specific teaching style and assessment process were chosen. Suskie1 says that for good assessment, the instructor at the start needs to “develop clearly articulated written statements of expected learning outcomes”, that is, what will the students know and be able to do by the end of the course.

For the course, the Student Learning Outcomes statements must meet the requirements of three different entities: ABET, the university’s General Education requirements, and the student evaluation of teaching process the university uses, which comes from the IDEA Center2. The IDEA Center has developed a list of twelve Learning Objectives (‘Objective’ as used by IDEA means the same as ‘Outcome’) that the course instructor can choose from, as the focus of the student’s evaluation of the learning the students achieved in the course. The course instructor chose three objectives to focus on: Learning how to find and use resources for answering questions or solving problems; Developing a clearer understanding of, and a commitment to, personal values; and Acquiring an interest in learning more by asking my own questions and seeking answers. Educational research highlighted by the IDEA Center and others show ...


Building An Engineering Honors Curriculum: Collegiate Consistency With Individual Flexibility, Amy Brewster, Robert Kirby, Art Spisak, Holly Blosser Yoder Oct 2014

Building An Engineering Honors Curriculum: Collegiate Consistency With Individual Flexibility, Amy Brewster, Robert Kirby, Art Spisak, Holly Blosser Yoder

2014 ASEE North Midwest Section Conference

Recently, Honors at Iowa developed a curriculum that all student members must complete to graduate with University Honors. The curriculum has two primary components; the first is building knowledge through course work and the second is the application of knowledge through hands on learning experiences. Because, however, the engineering undergraduate curriculum is more structured and sequential in nature than the curriculum of the other undergraduate colleges, a distinct honors engineering curriculum was developed collaboratively between the College of Engineering and the University Honors Program. This engineering-specific honors curriculum maintained the key features of course work and experience-based learning valued by ...