Engineering Commons^™

Distributions Of Pore Sizes And Atomic Densities In Binary Glasses Revealed By Molecular Dynamics Simulations, Nikolai V. Priezjev, Maxim A. Makeev

Mechanical and Materials Engineering Faculty Publications

We report on the results of a molecular dynamics simulation study of porous glassy media, formed in the process of isochoric rapid quenching from a high-temperature liquid state. The transition to a porous solid occurs due to the concurrent processes of phase separation and material solidification. The study is focused on topographies of the model porous structures and their dependence on temperature and average density. To quantify the pore-size distributions, we put forth a scaling relation that provides a satisfactory data collapse in systems with high porosity. We also find that the local density of the solid domains in the …

Bilayered Calcium Sulfate/Calcium Phosphate Space-Making Composites With Multiple Drug Delivery Capabilities, David A. Puleo, Bryan R. Orellana, Mike Mcquinn

Biomedical Engineering Faculty Patents

The present invention provides for bilayered composites that provide for sustained drug delivery and support to recovering tissue(s) and areas surrounding, such as with bone tissue. The two layers degrade at separate rates, thereby providing sustained mechanical support and tailored drug delivery.

Measuring 3d Molecular Orientation And Rotational Mobility Using A Tri-Spot Point Spread Function, Oumeng Zhang, Tianben Ding, Jin Lu, Hesam Mazidi, Matthew D. Lew

Electrical & Systems Engineering Publications and Presentations

We present a method to measure the molecular orientation and rotational mobility of single-molecule emitters by designing and implementing a Tri-spot point spread function. It can measure all degrees of freedom related to molecular orientation and rotational mobility. Its design is optimized by maximizing the theoretical limit of its measurement precision. We evaluate the precision and accuracy of the Tri-spot PSF by measuring the orientation and effective rotational mobility of single fluorescent molecules embedded in a polymer matrix.

A Robust Statistical Estimation (Rose) Algorithm Jointly Recovers The 3d Location And Intensity Of Single Molecules Accurately And Precisely, Hesam Mazidi, Arye Nehorai, Matthew D. Lew

Electrical & Systems Engineering Publications and Presentations

In single-molecule (SM) super-resolution microscopy, the complexity of a biological structure, high molecular density, and a low signal-to-background ratio (SBR) may lead to imaging artifacts without a robust localization algorithm. Moreover, engineered point spread functions (PSFs) for 3D imaging pose difficulties due to their intricate features. We develop a Robust Statistical Estimation algorithm, called RoSE, that enables joint estimation of the 3D location and photon counts of SMs accurately and precisely using various PSFs under conditions of high molecular density and low SBR.

Mechanical Engineering News, Georgia Southern University

Mechanical Engineering: News & Publications (2013-2023)

• Resume Boot Camp for Eagle Expo Career Fair

A Detailed Hydrodynamic Study To Help Community Based Resiliency Planning Under Extreme Climatic And Weather Events, Md Golam Rabbani Fahad

Theses and Dissertations

The State of New Jersey is particularly vulnerable to extreme weather and climatic events. This study concentrates on spatial and temporal vulnerability of these events using climate and hydrodynamic modelling. The first chapter focuses on historical climatic trend of temperature and precipitation as well as the future scenarios using 10 bias corrected climate model output considering high end emission scenario derived from Coupled Model Intercomparison Project Phase 5 (CMIP5). In the second chapter a coastal hydrodynamic model called ADCIRC-2DDI was implemented to assess the impact of hurricanes in the Western North Atlantic (WNAT) model domain. The efficiency of the model …

Numerical Simulation Of Uncoiling And Roller Leveling Processes From Steel Coils, Yufei Xiong

LSU Master's Theses

Uncoiling and roller leveling play an important role in pipe forming because it is prerequisite to make products with good quality. Uncoiling and roller leveling are used to reduce undesired characteristics such as imperfections in sheet flatness and residual stress. Considering residual stress in steel coil which has been ignored to date, a simplified coiling process is combined with uncoiling and leveling processes to investigate their effects on residual stress and curvature. The objective of this thesis research focuses particularly on studying the influence of coil diameter, uncoiling direction and leveling settings on residual stress and residual strip curvature after …

Electron Effective Mass In In0.33ga0.67n Determined By Mid- Infrared Optical Hall Effect, Nerijus Armakavicius, Vallery Stanishev, Sean Knight, Mathias Schubert, Vanya Darakchieva

Department of Electrical and Computer Engineering: Faculty Publications

Mid-infrared optical Hall effect measurements are used to determine the free charge carrier parameters of an unintentionally doped wurtzite-structure c-plane oriented In_0.33Ga_0.67N epitaxial layer. Room temperature electron effective mass parameters of m_ ¼ ð0:20560:013Þm0 andm_k ¼ ð0:20460:016Þm0 for polarization perpendicular and parallel to the c-axis, respectively,were determined. The free electron concentration was obtained as (1.760.2)_1019 cm^-3. Within our uncertainty limits, we detect no anisotropy for the electron effective mass parameter and we estimate the upper limit of the possible effective mass anisotropy as 7%. We discuss the influence of conduction band nonparabolicity on …

Formation Of Two-Way Shape Memory Effect In Niti Alloy Using Pulsed Laser Irradiation, Saidjafarzoda Ilhom, Khomidkhodza Kholikov, Peizhen Li, Dovletgeldi Seyitliyev, Zachary Thomas, Duvall Roberts, Omer San, Haluk E. Karaca, Ali O. Er

Mechanical Engineering Faculty Publications

Shape memory alloys (SMAs) are a unique class of smart materials and they were employed in various applications in engineering, biomedical, and aerospace technologies. Here, we report an advanced, efficient, and low-cost direct imprinting method with low environmental impact to create thermally controllable surface patterns. Patterned microindents were generated on Ni₅₀Ti₅₀ (at. %) SMAs using an Nd:YAG laser with 1064 nm wavelength at 10 Hz. Laser pulses at selected fluences were focused on the NiTi surface and generated pressure pulses of up to a few GPa. Optical microscope images showed that surface patterns with tailorable sizes can …

Microfluidic Technology And Application In Urinal Analysis, Jiwen Xiang

LSU Doctoral Dissertations

Microfluidic technology offers numerous advantages in minimizing and integrating the traditional assays. However, the lack of efficient control components of the microfluidic systems has been hindering the widely commercialization of the technology. The research work in this dissertation focused on the development of effective control components for microfluidic applications.

A linear peristaltic pump was firstly designed, fabricated, and tested for conventional microfluidics by synchronously compressing the microfluidic channel with a miniature cam-follower system in Chapter 2. The miniature cam-follower system and microfluidic chip was prototyped using three-dimensional (3D) printing technology and soft lithography technology. Results from experimental test showed that …

Antennas For Wv Band Applications, Firas Ayoub

Electrical and Computer Engineering ETDs

This dissertation focuses on designing, fabricating and testing antennas that are suitable for operation within the V/W bands. In particular, this work focuses on the design of slotted rectangular waveguide antenna arrays and cross slotted waveguide fed horn antennas. These structures are known for their high efficiency and high circularly polarized gain that can be implemented in satellite and terrestrial communication links. In addition, such designs can be implemented in radar applications that operate infrequency bands around 72 GHz or 84 GHz bands. Such antenna structures are inexpensive to fabricate since they can simply be machined using high precision conventional …

Novel Algorithms For Ultra Scale Electromagnetic Problems In The Supercomputing Era, Brian Mackie-Mason

Electrical and Computer Engineering ETDs

The need for increasing fidelity and accuracy in mission-critical electromagnetic applications have pushed the problem sizes toward extreme computational scales. Therefore, there is a large premium placed on the investigation of parallel and scalable integral equation simulators, a particularly useful class of computational electromagnetics, to meet this demand. This dissertation will focus on three interrelated areas: i) quasi-optimal, well-conditioned integral equation based domain decomposition methods, ii) geometry-adaptive, multi-scale discontinuous Galerkin boundary element methods, and iii) high-performance and scalable algorithms to reduce the computational complexity of extreme-scale simulations with the aid of parallel computing architectures. This dissertation will first develop the …

Hazards And Mitigation Measures In Aerospace Non-Destructive Testing, Khay-Wai Leong, Patti J. Clark

International Journal of Aviation, Aeronautics, and Aerospace

As an aircraft component is subjected to tensile/torsional/bending forces and heat cycles during operation, non-destructive inspection programs have been mandated by aviation regulatory authorities and component manufacturers to ensure that cracks and flaws in the aircraft structure, engine and components are detected before reaching catastrophic failure modes. In aerospace settings, eddy current, magnetic particle, dye penetrant and radiography inspection methods are known to affect worker health. Two recent studies have linked dye chemicals to bladder cancer, excessive electromagnetic field exposure has been linked to undue stress on the human body, and excessive exposure to ionizing radiation has been linked to …

Road Diet V2.0 - Road Diet With Roundabouts, Michael Williams

PSU Transportation Seminars

How can we go one step, or one lane, further than the standard road diet? Roundabouts allow a road diet to reduce the final number of lanes from three to two.

Questions arise when roundabouts are used with a road diet. What traffic volumes are supportable? Will the roundabouts fit within existing intersections? What does current guidance tell us about this approach?

Michael Williams will present his work on creating a sequel to FHWA’s Road Diet Informational Guide. This work is intended to provide a feasibility determination tool for the application of this approach to existing corridors. Data from Bird …

The Santa Clara, 2018-02-15, Santa Clara University

The Santa Clara

No abstract provided.

Development Trends In Intelligent Homes, I-Chen Chen, Jia-Shing Sheu, Husan-Wei Huang

Journal of Marine Science and Technology–Taiwan

Since the U.S. National Science and Technology Council began implementing its plans for the development of intelligent structures in 2004, the Taiwan Communications Industry Alliance has been committed to applying communication and monitoring technologies in the construction industry to develop a market for intelligent houses. Accordingly, in this paper, relevant studies from January 2000 to December 2016 were collected from the Web of Science database. A key-route main path analysis of the text and data as well as a growth analysis of the research clusters in this field were performed to determine the main research topics and development trajectories. The …

Classification Of Hydrodynamic Coefficients Of Autonomous Underwater Vehicles Based On Sensitivity Analyses In Standard Maneuvers, Mahnaz Abolvafaie, Hamid Reza Koofigar, Maryam Malekzadeh

Journal of Marine Science and Technology–Taiwan

Due to the important role of hydrodynamic coefficients in the control and guidance of an autonomous underwater vehicle (AUV), sensitivity analysis is proposed here, as a preliminary step to motion control design. Taking the standard maneuvers, including turning circle and horizontal and vertical zigzag, the sensitivity of various hydrodynamic coefficients with respect to velocities and position is determined. Such analyses are then used to classify the model parameters into three categories, as non-sensitive coefficients, coefficients with low influence on the motion and more sensitive coefficients.

Comparisons Of Position Control Of Valve-Controlled And Pump-Controlled Folding Machines, Ray-Hwa Wong, Wei-Heng Wong

Journal of Marine Science and Technology–Taiwan

Control units of electro-hydraulic double-axial folding machine can be classified as throttling type (valve-controlled) and volumetric type (pump-controlled). This paper focuses to compare their control performances. Valve-controlled folding machine (VCFM) has higher supply pressure, different circuit resistance between subsystems. Pump-controlled folding machine (PCFM) has variable working pressure and circuit resistance is slightly different. The folding machine is a coupled system and has significant structural interaction. This paper proposes coupled adaptive self-organizing sliding-mode fuzzy controllers to improve folding machine’s level control performance. It found higher supply pressure of VCFM cause faster transient response, larger maximum overshoot via a variety of coupled …

Free Vibration Analysis Of A Nonlinearly Tapered Beam Carrying Arbitrary Concentrated Elements By Using The Continuous-Mass Transfer Matrix Method, Ching-An Huang, Jong-Shyong Wu, Heiu-Jou Shaw

Journal of Marine Science and Technology–Taiwan

Although the exact solutions for the free vibration problems regarding most of the non-uniform beams are not yet obtainable, this is not true for the special case when the equation of motion of a non-uniform beam can be transformed into that of an equivalent uniform beam. The nonlinearly tapered beam studied in this paper is a single-tapered beam with constant depth h0 and varying width b(x) along its length in the form b x( )  4 0 b xL [1 ( )]  , where b0 is the minimum width,  is the taper constant, x is the axial …

Characterizing The Influence Of Matrix Ductility On Damage Phenomenology In Continuous Fiber-Reinforced Thermoplastic Laminates Undergoing Quasi-Static Indentation, A. Yudhanto, H. Wafai, G. Lubineau, R. Yaldiz, N. Verghese

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The use of thermoplastic matrix was known to improve the impact properties of laminated composites. However, different ductility levels can exist in a single family of thermoplastic matrix, and this may consequently modify the damage phenomenology of thermoplastic composites. This paper focuses on the effect of matrix ductility on the out-of-plane properties of thermoplastic composites, which was studied through quasi-static indentation (QSI) test that may represent impact problem albeit the speed difference. We evaluated continuous glass-fiber reinforced polypropylene thermoplastic composites (GFPP), and selected homopolymer PP and copolymer PP that represent ductile and less ductile matrices, respectively. Several cross-ply laminates were …

Wetting Properties Of Structured Interfaces Composed Of Surface-Attached Spherical Nanoparticles, Nikolai V. Priezjev, Bishal Bhattarai

Mechanical and Materials Engineering Faculty Publications

The influence of the external pressure and surface energy on the wetting transition at nanotextured interfaces is studied using molecular dynamics and continuum simulations. The surface roughness of the composite interface is introduced via an array of spherical nanoparticles with controlled wettability. We find that in the absence of an external pressure, the liquid interface is flat and its location relative to the solid substrate is determined by the particle size and the local contact angle. With increasing pressure on the liquid film, the interface becomes more curved and the three-phase contact line is displaced along the spherical surface but …

An Approach To Aligning Regions Of Interest On Infrared Palm-Dorsum Images Captured In Contactless Scenarios, Chih-Lung Lin, Hui-Fen Chiang, Hsu-Yung Cheng, Chih-Wei Kuo, Jun-Wei Hsieh

Journal of Marine Science and Technology–Taiwan

This paper presents an approach for solving a highly challenging problem in the preprocessing of hand-based biometrics, namely restoring IR palm-dorsum images captured in contactless scenarios and aligning regions of interest (ROIs) in the same regions on the various restored infrared (IR) palm-dorsum images captured from the same palm-dorsum. IR palm-dorsum images captured in contactless scenarios substantially increase the user-friendliness, security and sanitation of hand-based biometrics. However, images captured in contactless scenarios typically exhibit rotation, translation, scale and shear geometric transformations. These geometric transformations significantly reduce the accuracy of hand-based biometrics. An approach used to restore and align ROI on …

Molecular Simulation Of Steady-State Evaporation And Condensation In The Presence Of A Non-Condensable Gas, Zhi Liang, Pawel Keblinski

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Using Molecular Dynamics Simulations, We Study Evaporation and Condensation of Fluid Ar in the Presence of a Non-Condensable Ne Gas in a Nanochannel. the Evaporation and Condensation Are Driven by the Temperature Difference, ΔTL, between the Evaporating and Condensing Liquid Surfaces. the Steady-State Evaporation and Condensation Fluxes (JMD) Are Also Affected by the Ne Concentration, ΡNe, and the Nanochannel Length. We Find that Across a Wide Range of ΔTL and ΡNe, JMD is in Good Agreement with the Prediction from Stefan's Law and from Schrage Relationships. Furthermore, for ΔTL Less Than ∼20% of the Absolute Average Temperature, We Find that …

Two-Stage Concrete As A Sustainable Production, Hakim Salem Abdelgader, Ali Said Ahmed El-Baden, H. A. Abdurrahman, A. S.M. Abdul Awal

Mechanical and Civil Engineering Faculty Publications

Two-stage concrete (TSC) is a sustainable concrete which is produced by forcing a flowable cement grout mixture through the voids of a skeletal mass made of compacted preplaced aggregates. From the technical and economic aspects, TSC is particularly useful for construction and repair of concrete structures especially foundations, underwater construction, nuclear reactors, concrete dams, heritage structures and in constructions with closely spaced reinforcement. TSC differs from ordinary concrete in that it contains a higher proportion of stone aggregate and the aggregate stays in point-to-point contact as placed. Thus, the mechanical characteristics of the TSC in failure conditions are distinctly different …

Electrical & Computer Engineering News, Georgia Southern University

Electrical & Computer Engineering: News & Publications (2014-2023)

• Dr. Masoud Davari, Electrical and Computer Engineering Assistant Professor in the area of Power, Presents in Research Colloquium

College Of Engineering News, Georgia Southern University

College of Engineering & Computing: News & Publications (2010-2023)

• Masoud Davari participates in ECE Research Colloquium
• Record numbers of students on Dean’s and President’s Lists

Improving Resource Allocation And Power Fairness In Emerging Mobile Cellular Network Technologies, Bilal Al-Doori

Theses and Dissertations

This new millennium has been regarded as the era of the digital wireless communications revolution. With the intention of meeting the demands of the current customers’ services and bridging to the future digital network, namely 5G network, the duty of the radio resource management (RRM) to quantify different altitudes should be carried out in an effective mechanism for avoiding any potential waste of resources, power, and processing time. Therefore, this research intends to study and investigate the resource management for downlink radio access network in LTE-A and 5G systems. Furthermore, the packet scheduling, minimizing power, and guaranteeing suitable fairness of …

Bathymetry Data For Lakes Azuei And Enriquillo, Michael Piasecki, Mahrokh Moknatian

Publications and Research

This data set supports and forms the basis for the development of Digital Bathymetry Models (DBM) for Lakes Azuei (Haiti) and Enriquillo (Dominican Republic). Bathymetric Data is typically acquired using Sonar devices that measure the depth at specific points along a boat track and for which the longitude and latitude is recorded. From the resulting point cloud one develop a seamless representation of the floor of the lake on either a raster set (which is what we have done) or try to use a contour (vector representation) model in which the depth contours appear as polygons or -lines. The raw …

Research On An Electric Vehicle Owner-Friendly Charging Strategy Using Photovoltaic Generation At Office Sites In Major Chinese Cities, Su Su, Yong Hu, Tiantian Yang, Shidan Wang, Ziqi Liu, Xiangxiang Wei, Koji Yamashita, Et Al.

Michigan Tech Publications, Part 1

Electric vehicles (EV) and photovoltaic (PV) generation are widely recognized around the world. Most EV owners in the major Chinese cities are forced to charge their EV batteries at the workplace during the daytime due to the limited space near their homes, which will increase the peak load during the daytime. On the other hand, the PV output is most likely to have a peak at around noon, which means, PVs could have a potential capability to compensate the EV charging load. An EV owner-friendly charging strategy based on PV utilization which alleviates both the EV charging constraints and the …

Advanced Pavement Materials For Sustainable Transportation Infrastructure, Zhanping You, Meor O. Hamzah, Hainian Wang, Aboelkasim Diab, Qingli Dai

Michigan Tech Publications, Part 1

Many road managers and stakeholders are looking for more and better options for the construction and maintenance of flexible and rigid pavements. Well-designed strategies for pavement construction and maintenance have attracted the interests of researchers since a large number of existing pavements are facing deterioration all over the world. The selection and engineering properties of paving materials are crucial factors affecting the durability and therefore demanding standards of sustainability of the constructed pavement. Researchers worldwide are putting extensive efforts to develop and promote advanced pavement materials and structures for constructing and maintaining sustainable pavements. Pavement materials that can improve durability, …