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Missouri University of Science and Technology

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2012

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Articles 1 - 30 of 121

Full-Text Articles in Engineering

Analytical Representations For Frequency Dependences Of Microwave Permeability, Konstantin N. Rozanov, Marina Koledintseva Dec 2012

Analytical Representations For Frequency Dependences Of Microwave Permeability, Konstantin N. Rozanov, Marina Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic materials applied to solve various EMC and EMI problems require adequate analytical description of their RF and microwave material parameters. This is necessary for numerical optimization of wideband electromagnetic performance of devices incorporating these materials. The paper discusses the shape of frequency dependences of microwave permeability in homogeneous materials and composites. The Lorentzian frequency dispersion law is shown to allow for rather accurate description of all types of magnetic loss peaks, including those related to the ferromagnetic resonance and the effect of eddy currents. To model wideband electromagnetic performance of composites, mixing laws are typically used. The problem is …

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Alternative Aefie-Efie Method For Broadband Cem Modeling, Jia Liu, Li (Lijun) Jun Jiang Dec 2012

Alternative Aefie-Efie Method For Broadband Cem Modeling, Jia Liu, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

It is well known that the electric field integral equation (EFIE) has the low frequency breakdown problem while the Augmented electric field integral equation (AEFIE) method has the high frequency breakdown issue. To obtain a unified method that works for both low and high frequencies without manual switching of methods, a novel and simple method is proposed in this paper. It uses AEFIE and EFIE to compensate each other iteratively in all frequency regimes to guarantee the accuracy of the solution. As a result, it effectively extends AEFIE to the high frequency regime and extends EFIE to the low frequency …

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Electromagnetic Properties Of Metal Granular Composite Materials For Emc Applications, Takanori Tsutaoka, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva Dec 2012

Electromagnetic Properties Of Metal Granular Composite Materials For Emc Applications, Takanori Tsutaoka, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic properties of copper and Fe55Ni45alloy (Permalloy) composite materials have been studied by measuring the relative complex permeability (µr = µr’– jµr”), and permittivity (Σr = Σr’– jΣr”) spectra over the microwave range, as well as the a.c. electrical conductivity σac spectra. The variation of σac and Σr with particle content shows the insulator-metal transition due to the percolation effect. The effective cluster model can be applied to the percolation effect in permittivity. The permeability spectra in Permalloy composites, which contain the percolated particles, …

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A Single-Layer Compact Hf-Uhf Dual-Band Rfid Tag Antenna, Zi Long Ma, Li (Lijun) Jun Jiang, Jingtian Xi, Terry Tao Ye Dec 2012

A Single-Layer Compact Hf-Uhf Dual-Band Rfid Tag Antenna, Zi Long Ma, Li (Lijun) Jun Jiang, Jingtian Xi, Terry Tao Ye

Electrical and Computer Engineering Faculty Research & Creative Works

This letter presents a novel dual-band (HF and UHF) radio frequency identification (RFID) tag antenna. Two key challenges are faced: the compact dimension and the impaired bandwidth due to the couplings between two band structures. To enable the implementation of whole design on a credit-card-size single-layer support, a spiral coil along the edges of the card is designed to handle the HF (13.56 MHz) near-field coupling, and the UHF antenna is placed inside the coil instead of outside. Meanwhile, a diagonal symmetric design consisting of two meander lines inside the spiral coil is adopted for UHF band. This structure supports …

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A Circular Polarization Hybrid-Integrated Rectangular Ring Antenna For Rfid Reader, Yan Li, Sheng Sun, Lijun Jiang, Terry T. Ye Dec 2012

A Circular Polarization Hybrid-Integrated Rectangular Ring Antenna For Rfid Reader, Yan Li, Sheng Sun, Lijun Jiang, Terry T. Ye

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a compact hybrid-integrated microstrip rectangular ring antenna with circular polarization is proposed for RFID reader. By integrating a cross-slotted patch hybrid with a rectangular ring antenna in the same plane, the proposed antenna has the features of circular polarization, compact size, low cost, light weight and unique flexibility for RFID applications. A prototype operating at 915 MHz is designed and fabricated. The measured results agree well with the simulated results. © 2012 IEEE.

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Integral Equation Method For Analyzing Purcell Effect In Plasmonic System, Yongpin P. Chen, Weng Cho Chew, Wei E.I. Sha, W. C.H. Choy, Lijun Jiang Dec 2012

Integral Equation Method For Analyzing Purcell Effect In Plasmonic System, Yongpin P. Chen, Weng Cho Chew, Wei E.I. Sha, W. C.H. Choy, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Integral equation method is applied to analyze the Purcell effect in plasmonic system in this paper. By applying the Fermi's golden rule, the Purcell effect of a quantum emitter can be calculated from the local density of states (LDOS), which can be further expressed by the imaginary part of the Green's function of the whole system. To obtain this Green's function numerically, the layered medium Green's function is utilized to simplify the modeling of planarly layered substrate, where the surface plasmon polaritons (SPPs) can be sustained. The metallic nano scatterers are introduced to excite the localized surface plasmons (LSP), and …

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The Far Field Transformation Using The Iterative Srm Based On The Phaseless Data, Ping Li, Li (Lijun) Jun Jiang Dec 2012

The Far Field Transformation Using The Iterative Srm Based On The Phaseless Data, Ping Li, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional equivalent source reconstruction methods (SRM) require both phase and amplitude information of the field data. However, there are situations where the phase information is not easy to obtain. Hence, developing novel SRM based on phaseless data is necessary. In this paper, a novel iterative SRM based on two sets of measured phaseless data is presented. It can reproduce the 3D radiation pattern with very good accuracy. Integral equation (IE) is employed to build reconstruct equivalent source. Combined field IE (CFIE) is also employed to obtain more physical current distribution. © 2012 IEEE.

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Characterization Of Wave Physics Using The Rigorous Helmholtz Decomposition Based On The Surface Integral Equation, Xiaoyan Y.Z. Xiong, Wei E.I. Sha, Li (Lijun) Jun Jiang Dec 2012

Characterization Of Wave Physics Using The Rigorous Helmholtz Decomposition Based On The Surface Integral Equation, Xiaoyan Y.Z. Xiong, Wei E.I. Sha, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Helmholtz decomposition (HD) is a fundamental tool of vector calculus and plays an important role in electromagnetics. In this work, arbitrary vector field defined on the open or closed surface is decomposed into the sum of an irrotational (curl-free) vector field and a solenoidal (divergence-free) vector field by using the surface integral equation method. Unlike the popular loop-tree decomposition that is only a quasi-HD suitable for the circuit physics in the low frequency regime, the HD developed in this paper is rigorous and can capture both circuit and wave physics from very low frequency to high frequency regimes. The work …

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An Efficient Method For Highly Oscillatory Physical Optics Integrals, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew Dec 2012

An Efficient Method For Highly Oscillatory Physical Optics Integrals, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, we use the steepest descent path (SDP) method in the complex analysis to calculate the highly oscillatory physical optics (PO) integral with quadratic phase and amplitude variations on the triangular patch. Compared with traditional approximate asymptotic expansion approach, our method has significantly improved the PO integral accuracy by one to two digits (10 1 to 102) for evaluating the PO integral. Moreover, the computation effort for the highly oscillatory integral is frequency independent. © 2012 IEEE.

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Electric Field-Induced Tetragonal To Orthorhombic Phase Transitions In [110]C-Oriented Batio₃ Single Crystals, D. J. Franzbach, Yijia Gu, Long-Qing Chen, K. G. Webber Dec 2012

Electric Field-Induced Tetragonal To Orthorhombic Phase Transitions In [110]C-Oriented Batio₃ Single Crystals, D. J. Franzbach, Yijia Gu, Long-Qing Chen, K. G. Webber

Materials Science and Engineering Faculty Research & Creative Works

Electric field-induced phase transitions in [110]c-oriented BaTiO3 single crystals were studied by macroscopic electrical measurements in the temperature range from 20 °C to 50 °C. Discontinuous, hysteretic jumps in the polarization and strain were observed, indicating a tetragonal ↔ orthorhombic phase transition. The critical electric field to induce the transition was found to shift to higher values with increasing temperature. The Landau-Devonshire theory was used to analyze the observed electric field-induced T ↔ O phase transitions.

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Loss Enhanced Transmission And Collimation In Anisotropic Epsilon-Near-Zero Metamaterials, L. Sun, S. Feng, Xiaodong Yang Dec 2012

Loss Enhanced Transmission And Collimation In Anisotropic Epsilon-Near-Zero Metamaterials, L. Sun, S. Feng, Xiaodong Yang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

We verify the extraordinary transmission enhancement and collimation induced by the material loss in anisotropic epsilon-near-zero metamaterials, and reveal the physical mechanism of this exotic electromagnetic phenomenon via the iso-frequency contour analysis. In addition, we demonstrate the possibility in realization of such loss enhanced transmission of Gaussian beam in realistic silver-germanium multilayered structures by applying full-wave numerical simulations.

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Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar Dec 2012

Gas Adsorption In Novel Environments, Including Effects Of Pore Relaxation, W. Milton Cole, Silvina M. Gatica, Hye Young Kim, Angela D. Lueking, Sarmishtha Sircar

Chemical and Biochemical Engineering Faculty Research & Creative Works

Adsorption experiments have been interpreted frequently with simplified model geometries, such as ideally flat surfaces and slit or cylindrical pores. Recent explorations of unusual environments, such as fullerenes and metal-organic-framework materials, have led to a broadened scope of experimental, theoretical and simulation investigations. This paper reviews a number of such studies undertaken by our group. Among the topics receiving emphasis are these: universality of gas uptake in pores, relaxation of a porous absorbent due to gas uptake and the novel phases of gases on a single nanotube, all of which studies have been motivated by recent experiments.

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A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein Dec 2012

A Mechanistic Model Of Early Fcεri Signaling: Lipid Rafts And The Question Of Protection From Dephosphorylation, Dipak Barua, Byron Goldstein

Chemical and Biochemical Engineering Faculty Research & Creative Works

We present a model of the early events in mast cell signaling mediated by FcεRI where the plasma membrane is composed of many small ordered lipid domains (rafts), surrounded by a non-order region of lipids consisting of the remaining plasma membrane. The model treats the rafts as transient structures that constantly form and breakup, but that maintain a fixed average number per cell. The rafts have a high propensity for harboring Lyn kinase, aggregated, but not unaggregated receptors, and the linker for the activation of T cells (LAT). Phosphatase activity in the rafts is substantially reduced compared to the nonraft …

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Electromagnetic Emissions From The Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Tao Wang, Huasheng Ren Dec 2012

Electromagnetic Emissions From The Ic Packaging, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Tao Wang, Huasheng Ren

Electrical and Computer Engineering Faculty Research & Creative Works

The EMC and EMI of the IC packaging are becoming increasingly important to modern electronics. Its EMC, SI, and PI have been broadly attested. But electromagnetic radiations from IC packaging and the corresponding EMI were seldom studied. In this paper, the fundamental principles and properties of the electromagnetic radiations caused by vias and traces in IC packagings are carefully investigated. Various radiation mechanisms are analyzed for different representative scenarios. Numerical simulations are employed to support the analyzing results. © 2012 IEEE.

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Fundamental Components Of The Ic Packaging Electromagnetic Interference (Emi) Analysis, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Huasheng Ren Dec 2012

Fundamental Components Of The Ic Packaging Electromagnetic Interference (Emi) Analysis, Nick K.H. Huang, Li (Lijun) Jun Jiang, Huichun Yu, Gang Li, Shuai Xu, Huasheng Ren

Electrical and Computer Engineering Faculty Research & Creative Works

The IC packaging EMC/SI/PI problems have been broadly attested. But IC packaging EMI was seldom addressed. Because the EMI emission by IC packagings is increasingly significant, in this paper, EMI behaviors are systematically studied. To fundamentally understand the radiation mechanism, radiated contributions from ground lids, vias, and traces of the packaging are investigated and modeled separately. It is seen that the packaging EMI has clearly low frequency and high frequency behaviors. The low frequency behavior is due to the Hertzian dipole effects of vias. The high frequency behavior is due to the radiation of excited cavity modes. Both theoretical analysis …

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Zheng Classification In Traditional Chinese Medicine Based On Modified Specular-Free Tongue Images, Ratchadaporn Kanawong, Tayo Obafemi-Ajayi, Jun Yu, Dong Xu, Shao Li, Ye Duan Dec 2012

Zheng Classification In Traditional Chinese Medicine Based On Modified Specular-Free Tongue Images, Ratchadaporn Kanawong, Tayo Obafemi-Ajayi, Jun Yu, Dong Xu, Shao Li, Ye Duan

Electrical and Computer Engineering Faculty Research & Creative Works

Traditional Chinese Medicine practitioners usually observe the color and coating of a patient's tongue to determine ZHENG (such as Cold or Hot ZHENG) and to diagnose different stomach disorders including gastritis. In our previous work, we explored new modalities for clinical characterization of ZHENG in gastritis patients via tongue image analysis using various supervised machine-learning algorithms. We proposed a system that learns from the clinical practitioner's subjective data how to classify a patients health status by extracting meaningful features from tongue images based on color-space models. In this paper, we propose an enhancement to the ZHENG classification system: a coating …

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Explosively Formed Projectile Soft-Recovery Force Analysis, Laurin Bookout, Phillip R. Mulligan, Jason Baird Dec 2012

Explosively Formed Projectile Soft-Recovery Force Analysis, Laurin Bookout, Phillip R. Mulligan, Jason Baird

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The design of a soft-recovery system is critical to a researcher's ability to analyze hypervelocity projectiles. The researcher may decide to use one method over another based on several criteria, including whether or not non-deformed projectile measurements are required. This report analyzes the forces two different soft-recovery methods impart on the projectiles collected. Method 1 utilized three polyethylene water barrels placed “end-to-end” horizontally, providing 2.6 meters (9 feet) of water to stop the projectile. Method 2 is a modification of the soft-recovery method utilized in “Soft-Recovery of Explosively Formed Penetrators” by Lambert and Pope. This method utilizes a series of …

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Fabrication Of Cao-Nao-Sio2/Tio2 Scaffolds For Surgical Applications, A. W. Wren, A. Coughlan, K. E. Smale, S. T. Misture, B. P. Mahon, O. M. Clarkin, Mark R. Towler Dec 2012

Fabrication Of Cao-Nao-Sio2/Tio2 Scaffolds For Surgical Applications, A. W. Wren, A. Coughlan, K. E. Smale, S. T. Misture, B. P. Mahon, O. M. Clarkin, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

A series of titanium (Ti) based glasses were formulated (0.62 SiO2-0.14 Na2O-0.24 CaO, with 0.05 mol% TiO2 substitutions for SiO2) to develop glass/ceramic scaffolds for bone augmentation. Glasses were initially characterised using X-ray diffraction (XRD) and particle size analysis, where the starting materials were amorphous with 4.5 μm particles. Hot stage microscopy and high temperature XRD were used to determine the sintering temperature (̃700 °C) and any crystalline phases present in this region (Na2Ca3Si6O16, combeite and quartz). Hardness testing revealed that the Ti-free control (ScC- …

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Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan Dec 2012

Features For Automated Tongue Image Shape Classification, Tayo Obafemi-Ajayi, Ratchadaporn Kanawong, Dong Xu, Shao Li, Ye Duan

Electrical and Computer Engineering Faculty Research & Creative Works

Inspection of the tongue is a key component in Traditional Chinese Medicine. Chinese medical practitioners diagnose the health status of a patient based on observation of the color, shape, and texture characteristics of the tongue. The condition of the tongue can objectively reflect the presence of certain diseases and aid in the differentiation of syndromes, prognosis of disease and establishment of treatment methods. Tongue shape is a very important feature in tongue diagnosis. A different tongue shape other than ellipse could indicate presence of certain pathologies. In this paper, we propose a novel set of features, based on shape geometry …

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Skin-Effect Model For Round Wires In Peec, Albert E. Ruehli, Giulio Antonini, Lijun Jiang Dec 2012

Skin-Effect Model For Round Wires In Peec, Albert E. Ruehli, Giulio Antonini, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper we consider the skin-and radiation effects for a thin wire segment. Circuit models are being constructed which are suitable for the modeling of thin wires like the wire bonds. We use the internal-external inductance model for this purpose of including the skin-effect in the partial inductance. These models make it possible to include thin, round conductors in a PEEC model at a much lower cost in compute time. The ultimate goal is to construct a circuit model which can be applied both in the time and frequency domain to signal and power integrity problems. © 2012 IEEE.

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Investigation Of The Physical And Molecular Properties Of Asphalt Binders Processed With Used Motor Oils, Mohyeldin Ragab, Magdy Abdelrahman Dec 2012

Investigation Of The Physical And Molecular Properties Of Asphalt Binders Processed With Used Motor Oils, Mohyeldin Ragab, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this work we investigated the performance aspects of addition of used motor oils (UMO) to neat and crumb rubber modified asphalts (CRMA) and related that to the change of molecular size distribution of modified asphalt’s fractions; asphaltenes, saturates, naphthene aromatics, and polar aromatics. Based on the results of temperature sweep viscoelastic tests, addition of crumb rubber modifier (CRM) alone or with UMO results in the formation of internal network within the modified asphalt. Based on the results of short and long term aged asphalts, the utilization of combination of UMO and CRM enhanced the aging behavior of asphalt. Bending …

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Generalized Modal Expansion Of Electromagnetic Field In 2-D Bounded And Unbounded Media, Qi I. Dai, Weng Cho Chew, Yat Hei Lo, Yang G. Liu, Li (Lijun) Jun Jiang Oct 2012

Generalized Modal Expansion Of Electromagnetic Field In 2-D Bounded And Unbounded Media, Qi I. Dai, Weng Cho Chew, Yat Hei Lo, Yang G. Liu, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A generalized modal expansion theory is presented to investigate and illustrate the physics of wave-matter interaction within arbitrary two-dimensional (2-D) bounded and unbounded electromagnetic problems. We start with the bounded case where the field excited by any sources is expanded with a complete set of biorthogonal eigenmodes. In regard to non-Hermitian or nonreciprocal problems, an auxiliary system is constructed to seek for the modal-expansion solution. We arrive at the unbounded case when the boundary tends to infinity or is replaced by the perfectly matched layer (PML). Modes are approximately categorized into two types: trapped modes and radiation modes, which respond …

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A New Green's Function Formulation For Modeling Homogeneous Objects In Layered Medium, Yongpin P. Chen, Weng Cho Chew, Lijun Jiang Oct 2012

A New Green's Function Formulation For Modeling Homogeneous Objects In Layered Medium, Yongpin P. Chen, Weng Cho Chew, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

A new Green's function formulation is developed systematically for modeling general homogeneous (dielectric or magnetic) objects in a layered medium. The dyadic form of the Green's function is first derived based on the pilot vector potential approach. The matrix representation in the moment method implementation is then derived by applying integration by parts and vector identities. The line integral issue in the matrix representation is investigated, based on the continuity property of the propagation factor and the consistency of the primary term and the secondary term. The extinction theorem is then revisited in the inhomogeneous background and a surface integral …

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Microwave And Millimeter-Wave Sensors, Systems, And Techniques For Electromagnetic Imaging And Materials Characterization, Andrea Randazzo, Kristen M. Donnell, Yeousong Lee Oct 2012

Microwave And Millimeter-Wave Sensors, Systems, And Techniques For Electromagnetic Imaging And Materials Characterization, Andrea Randazzo, Kristen M. Donnell, Yeousong Lee

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Specification For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute Oct 2012

Specification For The Design, Testing, And Utilization Of Industrial Steel Storage Racks, Rack Manufacturers Institute

Rack Manufacturers Institute (RMI) Specifications and Manuals (1984 - 2012)

The standard applies to industrial pallet racks, movable shelf racks, and stacker racks made of cold-formed or hot-rolled steel structural members. It does not apply to other types of racks, such as drive-in or drive-through racks, cantilever racks, portable racks, etc. or to racks made of material other than steel.

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Method And Apparatus For Jet-Assisted Drilling Or Cutting, David A. Summers, Klaus Woelk, Kenneth Doyle Oglesby, Greg Galecki Sep 2012

Method And Apparatus For Jet-Assisted Drilling Or Cutting, David A. Summers, Klaus Woelk, Kenneth Doyle Oglesby, Greg Galecki

Mining Engineering Faculty Research & Creative Works

An abrasive cutting or drilling system, apparatus and method, which includes an upstream supercritical fluid and/or liquid carrier fluid, abrasive particles, a nozzle and a gaseous or low-density supercritical fluid exhaust abrasive stream. The nozzle includes a throat section and, optionally, a converging inlet section, a divergent discharge section, and a feed section.

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Dendrochemistry Of Multiple Releases Of Chlorinated Solvents At A Former Industrial Site, Jean Christophe Balouet, Joel Gerard Burken, Frank Karg, Don Vroblesky, Kevin T. Smith, Håkan Grudd, Anders Rindby, François Beaujard, Michel Chalot Sep 2012

Dendrochemistry Of Multiple Releases Of Chlorinated Solvents At A Former Industrial Site, Jean Christophe Balouet, Joel Gerard Burken, Frank Karg, Don Vroblesky, Kevin T. Smith, Håkan Grudd, Anders Rindby, François Beaujard, Michel Chalot

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Trees Can Take Up and Assimilate Contaminants from the Soil, Subsurface, and Groundwater. Contaminants in the Transpiration Stream Can Become Bound or Incorporated into the Annual Rings Formed in Trees of the Temperate Zones. the Chemical Analysis of Precisely Dated Tree Rings, Called Dendrochemistry, Can Be Used to Interpret Past Plant Interactions with Contaminants. This Investigation Demonstrates that Dendrochemistry Can Be Used to Generate Historical Scenarios of Past Contamination of Groundwater by Chlorinated Solvents at a Site in Verl, Germany. Increment Cores from Trees at the Verl Site Were Collected and Analyzed by Energy-Dispersive X-Ray Fluorescence (EDXRF) Line Scanning. the …

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Production Scheduling And Waste Disposal Planning For Oil Sands Mining Using Goal Programming, E. Ben-Awuah, H. Askari-Nasab, Kwame Awuah-Offei Sep 2012

Production Scheduling And Waste Disposal Planning For Oil Sands Mining Using Goal Programming, E. Ben-Awuah, H. Askari-Nasab, Kwame Awuah-Offei

Mining Engineering Faculty Research & Creative Works

In oil sands mining, timely provisions of ore and tailings containment with less environmental footprints are the main drivers of profitability and sustainability. The recent Alberta Energy Resources Conservation Board Directive 074 requires oil sands waste disposal planning to be an integral part of mine planning. This requires the development of a well integrated strategy of directional mining and tailings dyke construction for in-pit and ex-pit tailings storage management. The objectives of this paper are to: 1) determine the order and time of extraction of ore, dyke material and waste that maximizes the net present value; 2) determine the destination …

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Design And Characterization Of Asymmetric Cross-Linked Polymer Membranes By Molecular Dynamics Modeling And Simulations, Jee-Ching Wang, Athanasios I. Liapis Sep 2012

Design And Characterization Of Asymmetric Cross-Linked Polymer Membranes By Molecular Dynamics Modeling And Simulations, Jee-Ching Wang, Athanasios I. Liapis

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

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Stochastic Simulation Of Entangled Polymeric Liquids In Fast Flows: Microstructure Modification, Joontaek Park, David W. Mead, Morton M. Denn Sep 2012

Stochastic Simulation Of Entangled Polymeric Liquids In Fast Flows: Microstructure Modification, Joontaek Park, David W. Mead, Morton M. Denn

Chemical and Biochemical Engineering Faculty Research & Creative Works

We have modified the full-chain stochastic tube (XDS) model developed by Xu et al. [J. Rheol. 50, 477-494 (2006)] to simulate the rheology of entangled melts and solutions of linear monodisperse polymers. The XDS model, which has a single adjustable parameter that is equivalent to the Rouse time, successfully describes steady and transient shear and normal stress data at low to moderate rates, but the results deviate systematically from experimental data at high rates. The algorithm for re-entanglement was revised, and a configuration- dependent friction coefficient (CDFC), as originally proposed by Giesekus, was incorporated to account for microstructural change of …

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