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Articles 5431 - 5460 of 21795

Full-Text Articles in Engineering

Infrared Metasurfaces Created With Off-Normal Incidence Microsphere Photolithography, Chuang Qu, Edward C. Kinzel May 2017

Infrared Metasurfaces Created With Off-Normal Incidence Microsphere Photolithography, Chuang Qu, Edward C. Kinzel

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Fabricating metasurfaces over large areas at low costs remains a critical challenge to their practical implementation. This paper reports on the use of microsphere photolithography (MPL) to create infrared metasurfaces by changing the angle-of-incidence of the illumination to steer the photonic jet. The displacement of the photonic jet is shown to scale with the diameter of the microsphere while the exposure dose scales with the square of the microsphere diameter. This process is robust in the presence of local defects in the microsphere lattice. The paper demonstrates patterning split ring resonators and tripole based metasurfaces using MPL, which are fabricated …

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Multi-Objective Dynamic Economic Dispatch With Demand Side Management Of Residential Loads And Electric Vehicles, Mohammad Rasoul Narimani, Fnu Maigha, Jhi-Young Joo, Mariesa Crow May 2017

Multi-Objective Dynamic Economic Dispatch With Demand Side Management Of Residential Loads And Electric Vehicles, Mohammad Rasoul Narimani, Fnu Maigha, Jhi-Young Joo, Mariesa Crow

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a multi-objective optimization method based on the normal boundary intersection is proposed to solve the dynamic economic dispatch with demand side management of individual residential loads and electric vehicles. The proposed approach specifically addresses consumer comfort through acceptable appliance deferral times and electric vehicle charging requirements. The multi-objectives of minimizing generation costs, emissions, and energy loss in the system are balanced in a Pareto front approach in which a fuzzy decision making method has been implemented to find the best compromise solution based on desired system operating conditions. The normal boundary intersection method is described and validated.

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Effect Of Single Dead End Entry Inclination On Dpm Plume Dispersion, Yi Zheng, Hai Lan, Magesh Thiruvengadam, Jerry C. Tien, Ying Li May 2017

Effect Of Single Dead End Entry Inclination On Dpm Plume Dispersion, Yi Zheng, Hai Lan, Magesh Thiruvengadam, Jerry C. Tien, Ying Li

Mining Engineering Faculty Research & Creative Works

Diesel particulate matter (DPM) is a by-product from operating diesel engines. Since diesel powers are one of the major sources of energy for mobile underground mining equipment, the adverse health effects of DPM are of a great concern. This paper used computational fluid dynamics (CFD) method to study the effect of entry inclination on DPM plume distribution in a dead-end entry. An upward mining face and a downward mining face were built with a truck and a loader in loading operation close to the face area. A species transport model with incorporated buoyancy effect was used to examine the DPM …

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Investigating Process-Structure Relations Of Zno Nanofiber Via Electrospinning Method, Ehsan Ghafari, Yining Feng, Yao Liu, Ian T. Ferguson, Na Lu May 2017

Investigating Process-Structure Relations Of Zno Nanofiber Via Electrospinning Method, Ehsan Ghafari, Yining Feng, Yao Liu, Ian T. Ferguson, Na Lu

Electrical and Computer Engineering Faculty Research & Creative Works

1D ZnO nanofibers were fabricated in this study using the electrospinning method through sol-gel approach. The effects of fabrication processing parameters on the nanofibers size have been systematically investigated. The higher concentration of the polymer resulted in a broader distribution of the nanofibers diameter due to non-uniform ejection of the fluid jet. The results indicated that an increase in annealing temperature resulted in a lower diameter size and more uniformity of the nanofiber due to decomposition of PVA. The DSC result confirms that an annealing temperature higher than 480 °C is required to remove the PVA and fully decompose the …

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Fast Monostatic Scattering Analysis Based On Bayesian Compressive Sensing, Huan Huan Zhang, Wei E.I. Sha, Li (Lijun) Jun Jiang May 2017

Fast Monostatic Scattering Analysis Based On Bayesian Compressive Sensing, Huan Huan Zhang, Wei E.I. Sha, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In conjugation with the method of moments, the Bayesian compressive sensing algorithm is utilized to fast analyze the monostatic electromagnetic scattering problem. Different from the orthogonal matching pursuit based compressive sensing approach that cannot determine the required measurement times, the proposed method overcomes the difficulty by adopting the Bayesian framework to recover the underlying signal. Error bars of the signal can be obtained in the recovery procedure, which offers a way to adaptively determine the number of compressive-sensing measurements.

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Load Characteristics Of Wireless Power Transfer System With Different Resonant Types And Resonator Numbers, Yiming Zhang, Zhengming Zhao, Kainan Chen, Jun Fan May 2017

Load Characteristics Of Wireless Power Transfer System With Different Resonant Types And Resonator Numbers, Yiming Zhang, Zhengming Zhao, Kainan Chen, Jun Fan

Electrical and Computer Engineering Faculty Research & Creative Works

Wireless Power Transfer (WPT) has been the research focus and applied in many fields. Normally power is transferred wirelessly to charge the battery, which requires specific load characteristics. The load characteristics are essential for the design and operation of the WPT system. This paper investigates the load characteristics of the WPT system with different resonant types and resonator numbers. It is found that in a WPT system with series or LCL resonance under a constant voltage source, the load characteristic is determined by the number of inductors. Even number of inductors results in a constant current characteristic and odd number …

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Intensity Control Of Individual Dbd Plasma Filament. Ii. Fundamental Physical Mechanism, M. C. Paliwoda, J. L. Rovey May 2017

Intensity Control Of Individual Dbd Plasma Filament. Ii. Fundamental Physical Mechanism, M. C. Paliwoda, J. L. Rovey

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Filamentary volume dielectric barrier discharge (DBD) produces patterned plasma structures that are currently being explored for reconfigurable metamaterial applications. Previous work has demonstrated control of the presence and intensity of a single DBD plasma filament (within an array of filaments) by biasing a low voltage needle electrode. The results were attributed to redistributed charge inside the DBD due to the modified electric field created by the needle electrode. In the present work, results from a 3D electrodynamic field simulation bolster this argument. Results show that increasing needle bias voltage causes changes in the transverse electric field structure, resulting in redistribution …

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Enhancement Of Heat Transfer Coefficient Using Fe₂O₃-Water Nanofluids, Nasser Zouli, S. A. M. Mohammed, Muthanna H. Al-Dahhan May 2017

Enhancement Of Heat Transfer Coefficient Using Fe₂O₃-Water Nanofluids, Nasser Zouli, S. A. M. Mohammed, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

In this work, we developed a local heat transfer probe that can measure the heat transfer coefficient to study the effect of the nanofluid with various concentrations and size of nanoparticles on the local heat transfer coefficient in a developed separate effect experimental setup.Water with iron (III) oxide (Fe₂O₃) nanoparticles were used as the nanofluids flowing through the test section. The nanoparticle sizes of the Fe₂O₃ were varying between 20 and 40nm. The concentrations for the different nanoparticle sizes were ranged between 0 and 0.09 % in volume fractions. The results show that use of aqueous Fe₂O₃ nanoparticles can significantly …

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Common Treatments And Procedures Used For Fractures Of The Distal Radius And Scaphoid: A Review, Basel A. Khader, Mark R. Towler May 2017

Common Treatments And Procedures Used For Fractures Of The Distal Radius And Scaphoid: A Review, Basel A. Khader, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

The distal radius and the scaphoid are the most commonly injured carpal bones among both active adults and the osteoporotic elderly. The purpose of surgical treatment is to restore form and function to the wrist. Depending on the nature of the fracture, either topical procedures or invasive surgery can be applied. This article critiques the treatments currently used for fixation of wrist fractures in order to drive the development of new materials to improve patient outcomes.

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Surface Waves Extraction And Their Effect On Effective Material Parameters Of Metamaterials, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha Apr 2017

Surface Waves Extraction And Their Effect On Effective Material Parameters Of Metamaterials, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

We investigate the influence of the finite width of the metamaterial slabs. The surface waves excited in finite-width slabs are numerically extracted by the rigorous coupled-wave analysis method. The magnitudes and decay rates of surface waves are analyzed for different materials and geometries. A general homogenization method based on the analysis of appropriately defined macroscopic fields in metamaterial cells is proposed to retrieve the effective material parameters as functions of position. The effects of surface waves on effective material parameters are studied.

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Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, Oratai Jongprateep, Vladimir Petrovsky, Fatih Dogan Apr 2017

Effects Of Yttria Concentration And Microstructure On Electric Breakdown Of Yttria Stabilized Zirconia, Oratai Jongprateep, Vladimir Petrovsky, Fatih Dogan

Materials Science and Engineering Faculty Research & Creative Works

Ceramic materials have great potentials for capacitor application. However, low breakdown strength of the materials remains a key challenge for development of high-performance capacitors. In this study, yttria stabilized zirconia (YSZ) were fabricated and tested for breakdown strength. YSZ samples with 3, 8, and 10 mol% yttria were carefully processed to control grain size and porosity level. Experimental results revealed that breakdown strength as high as 2 MV/cm could be achieved. The breakdown strength was not significantly affected by porosity level, but it was by yttria concentration. Relationship among yttria concentration, residual porosity and breakdown strength is discussed in this …

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Mixing Of Spin And Orbital Angular Momenta Via Second-Harmonic Generation In Plasmonic And Dielectric Chiral Nanostructures, Xiaoyan Y.Z. Xiong, Ahmed Al-Jarro, Li (Lijun) Jun Jiang, Nicolae C. Panoiu, Wei E.I. Sha Apr 2017

Mixing Of Spin And Orbital Angular Momenta Via Second-Harmonic Generation In Plasmonic And Dielectric Chiral Nanostructures, Xiaoyan Y.Z. Xiong, Ahmed Al-Jarro, Li (Lijun) Jun Jiang, Nicolae C. Panoiu, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

We present a theoretical study of the characteristics of the nonlinear spin-orbital angular momentum coupling induced by second-harmonic generation in plasmonic and dielectric nanostructures made of centrosymmetric materials. In particular, the connection between the phase singularities and polarization helicities in the longitudinal components of the fundamental and second-harmonic optical fields and the scatterer symmetry properties are discussed. By in-depth comparison between the interaction of structured optical beams with plasmonic and dielectric nanostructures, we have found that all-dielectric and plasmonic nanostructures that exhibit magnetic and electric resonances have comparable second-harmonic conversion efficiency. In addition, mechanisms for second-harmonic enhancement for single and …

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Nanoselective Area Growth Of Defect-Free Thick Indium-Rich Ingan Nanostructures On Sacrificial Zno Templates, Renaud Puybaret, David J. Rogers, Youssef El Gmili, Suresh Sundaram, Matthew B. Jordan, Xin Li, Gilles Patriarche, Ferechteh H. Teherani, Eric V. Sandana, Philippe Bove, Paul L. Voss, Ryan Mcclintock, Manijeh Razeghi, Ian Ferguson Apr 2017

Nanoselective Area Growth Of Defect-Free Thick Indium-Rich Ingan Nanostructures On Sacrificial Zno Templates, Renaud Puybaret, David J. Rogers, Youssef El Gmili, Suresh Sundaram, Matthew B. Jordan, Xin Li, Gilles Patriarche, Ferechteh H. Teherani, Eric V. Sandana, Philippe Bove, Paul L. Voss, Ryan Mcclintock, Manijeh Razeghi, Ian Ferguson

Electrical and Computer Engineering Faculty Research & Creative Works

Nano selective area growth (NSAG) by metal organic vapor phase epitaxy of high-quality InGaN nanopyramids on GaN-coated ZnO/c-sapphire is reported. Nanopyramids grown on epitaxial low-temperature GaN-on-ZnO are uniform and appear to be single crystalline, as well as free of dislocations and V-pits. They are also indium-rich (with homogeneous 22% indium incorporation) and relatively thick (100 nm). These properties make them comparable to nanostructures grown on GaN and AlN/Si templates, in terms of crystallinity, quality, morphology, chemical composition and thickness. Moreover, the ability to selectively etch away the ZnO allows for the potential lift-off and transfer of the InGaN/GaN nanopyramids onto …

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Sophorolipid Butyl Ester Diacetate Does Not Affect Macrophage Polarization But Enhances Astrocytic Glial Fibrillary Acidic Protein Expression At Micromolar Concentrations In Vitro, Alexis M. Ziemba, Manoj K. Gottipati, Filbert Totsingan, Cheryl M. Hanes, Richard A. Gross, Michelle R. Lennartz, Ryan J. Gilbert Apr 2017

Sophorolipid Butyl Ester Diacetate Does Not Affect Macrophage Polarization But Enhances Astrocytic Glial Fibrillary Acidic Protein Expression At Micromolar Concentrations In Vitro, Alexis M. Ziemba, Manoj K. Gottipati, Filbert Totsingan, Cheryl M. Hanes, Richard A. Gross, Michelle R. Lennartz, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Peritoneal macrophages (PMACs) and spinal cord astrocytes were exposed to varying concentrations of soluble sophorolipid butyl ester diacetate (SLBEDA) in vitro. Macrophages and astrocytes demonstrated no decrease in viability in response to SLBEDA. Studying pro- and anti-inflammatory genes, PMACs did not show a shift toward a pro-inflammatory phenotype. However, at higher concentrations (3 and 30 μM), astrocytes showed an increase in their expression of glial acidic fibrillary protein. This novel category of compounds poses low risk to PMAC and astrocyte viability; however, the effect on PMAC polarization and astrocyte reactivity requires more elucidation.

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Design Of Dual Loaded Rfid Tag For Higher Order Modulations, Shadi Ebrahimi-Asl, Mohammad Tayeb Ahmad Ghasr, Maciej Jan Zawodniok Apr 2017

Design Of Dual Loaded Rfid Tag For Higher Order Modulations, Shadi Ebrahimi-Asl, Mohammad Tayeb Ahmad Ghasr, Maciej Jan Zawodniok

Electrical and Computer Engineering Faculty Research & Creative Works

Methods, systems, and apparatus for an improved antenna, specifically a T-match bowtie antenna system, including a t-match antenna having a first side and a second side, wherein the antenna is dual loaded; a first load soldered to the first side of the antenna; a second load soldered to the second side of the antenna; and a gap defined by the space between the first load and the second load, wherein the gap is approximately one millimeter; where the antenna is capable of providing quasi-32-QAM encoding.

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Machine Learning Based Mom (Ml-Mom) For Parasitic Capacitance Extractions, He Ming Yao, Yu Wei Qin, Li (Lijun) Jun Jiang Apr 2017

Machine Learning Based Mom (Ml-Mom) For Parasitic Capacitance Extractions, He Ming Yao, Yu Wei Qin, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

This paper is a rethinking of the conventional method of moments (MoM) using the modern machine learning (ML) technology. By repositioning the MoM matrix and unknowns in an artificial neural network (ANN), the conventional linear algebra MoM solving is changed into a machine learning training process. The trained result is the solution. As an application, the parasitic capacitance extraction broadly needed by VLSI modeling is solved through the proposed new machine learning based method of moments (ML-MoM). The multiple linear regression (MLR) is employed to train the model. The computations are done on Amazon Web Service (AWS). Benchmarks demonstrated the …

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Numerical Simulations Of Intrusive Gravity Currents Interacting With A Bottom-Mounted Obstacle In A Continuously Stratified Ambient, Jian Zhou, Subhas K. Venayagamoorthy Apr 2017

Numerical Simulations Of Intrusive Gravity Currents Interacting With A Bottom-Mounted Obstacle In A Continuously Stratified Ambient, Jian Zhou, Subhas K. Venayagamoorthy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this study, the flow dynamics of intrusive gravity currents past a bottom-mounted obstacle were investigated using highly resolved numerical simulations. The propagation dynamics of a classic intrusive gravity current was first simulated in order to validate the numerical model with previous laboratory experiments. A bottom-mounted obstacle with a varying non-dimensional height of D~ = D/ H, where D is the obstacle height and H is the total flow depth, was then added to the problem in order to study the downstream flow pattern of the intrusive gravity current. For short obstacles, the intrusion re-established itself downstream without much distortion. …

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Fabrication And Characterization Of Alₓcofenicu₁₋ₓ High Entropy Alloys By Laser Metal Deposition, X. Chen, L. Yan, S. Karnati, Y. Zhang, Frank W. Liou Apr 2017

Fabrication And Characterization Of Alₓcofenicu₁₋ₓ High Entropy Alloys By Laser Metal Deposition, X. Chen, L. Yan, S. Karnati, Y. Zhang, Frank W. Liou

Mechanical and Aerospace Engineering Faculty Research & Creative Works

No abstract provided.

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Investigating The Potential Of Using Off-Axis 3d Woven Composites In Composite Joints’ Applications, Mohamed Nasr Saleh, Ying Wang, Arief Yudhanto, Adam Joesbury, Prasad Potluri, Gilles Lubineau, Constantinos Soutis Apr 2017

Investigating The Potential Of Using Off-Axis 3d Woven Composites In Composite Joints’ Applications, Mohamed Nasr Saleh, Ying Wang, Arief Yudhanto, Adam Joesbury, Prasad Potluri, Gilles Lubineau, Constantinos Soutis

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The effect of circular notch has been evaluated for three different architectures of three-dimensional (3D) carbon fiber woven composites (orthogonal, ORT; layer-to-layer, LTL; angle interlock, AI) through open-hole quasi-static tension and double-lap bearing strength tests in the off-axis (45°) direction. Damage characterization is monitored using Digital Image correlation (DIC) for open-hole testing and X-ray Computed Tomography (CT) for double-lap bearing strength test. The off-axis notched 3D woven composites exhibit minor reduction (less than 10 %) of the notched strength compared to the un-notched strength. DIC strain contour clearly show stress/strain localization regions around the hole periphery and stress/strain redistribution away …

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Studies Of Hypervelocity Impact Phenomena As Applied To The Protection Of Spacecraft Operating In The Mmod Environment, William P. Schonberg Apr 2017

Studies Of Hypervelocity Impact Phenomena As Applied To The Protection Of Spacecraft Operating In The Mmod Environment, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In keeping with the tradition of the Hypervelocity Impact Society, this paper is a written version of the keynote address I presented at the start of 2015 Hypervelocity Impact Symposium as the recipient of the Society's Distinguished Scientist Award. It covers the highlights of my nearly 30 year career working in the area of hypervelocity impact phenomenology, mainly as it is applied to the protection of humans and spacecraft that work an operate in the micrometeoroid and orbital debris (MMOD) environment.

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Ballistic Limit Equations For Non-Aluminum Projectiles Impacting Dual-Wall Spacecraft Systems, William P. Schonberg, J. Martin Ratliff Apr 2017

Ballistic Limit Equations For Non-Aluminum Projectiles Impacting Dual-Wall Spacecraft Systems, William P. Schonberg, J. Martin Ratliff

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

One of the primary design considerations of earth-orbiting spacecraft is the mitigation of the damage that might occur from an on-orbit MMOD impact. Traditional damage-resistant design consists of a 'bumper' that is placed a small distance away from a spacecraft component or from the wall of the element in which it is housed. The performance of such a multi-wall structural element is typically characterized by its ballistic limit equation (BLE), which defines the threshold particle size that results in a failure of the spacecraft element. BLEs are also key components of any micro-meteoroid/orbital debris (MMOD) risk assessment calculations. However, these …

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Linear Precoding For Fading Cognitive Multiple-Access Wiretap Channel With Finite-Alphabet Inputs, Juening Jin, Chengshan Xiao, Meixia Tao, Wen Chen Apr 2017

Linear Precoding For Fading Cognitive Multiple-Access Wiretap Channel With Finite-Alphabet Inputs, Juening Jin, Chengshan Xiao, Meixia Tao, Wen Chen

Electrical and Computer Engineering Faculty Research & Creative Works

We investigate the fading cognitive multiple-access wiretap channel (CMAC-WT), in which two secondary-user transmitters (STs) send secure messages to a secondary-user receiver (SR) in the presence of an eavesdropper and subject to interference threshold constraints at multiple primary-user receivers (PRs). We design linear precoders to maximize the average secrecy sum rate for a multiple-input-multiple-output (MIMO) fading CMAC-WT under finite-alphabet inputs and statistical channel state information at STs. For this nondeterministic polynomial-time NP-hard problem, we utilize an accurate approximation of the average secrecy sum rate to reduce the computational complexity and then present a two-layer algorithm by embedding the convex-concave procedure …

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Polysaccharide Fabrication Platforms And Biocompatibility Assessment As Candidate Wound Dressing Materials, Donald C. Aduba Jr., Hu Yang Mar 2017

Polysaccharide Fabrication Platforms And Biocompatibility Assessment As Candidate Wound Dressing Materials, Donald C. Aduba Jr., Hu Yang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Wound dressings are critical for wound care because they provide a physical barrier between the injury site and outside environment, preventing further damage or infection. Wound dressings also manage and even encourage the wound healing process for proper recovery. Polysaccharide biopolymers are slowly becoming popular as modern wound dressings materials because they are naturally derived, highly abundant, inexpensive, absorbent, non-toxic and non-immunogenic. Polysaccharide biopolymers have also been processed into biomimetic platforms that offer a bioactive component in wound dressings that aid the healing process. This review primarily focuses on the fabrication and biocompatibility assessment of polysaccharide materials. Specifically, fabrication platforms …

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Stress And Thermal Characterization Of 4h-Sic Microelectromechanical Structures, Colton Wells, Jheng Yi Jiang, Ting Fu Chang, Chih Fang Huang, Jiaxin Ke, Weijun Luo, Guangrui Xia, Kuan Yew Cheong, Feng Zhao Mar 2017

Stress And Thermal Characterization Of 4h-Sic Microelectromechanical Structures, Colton Wells, Jheng Yi Jiang, Ting Fu Chang, Chih Fang Huang, Jiaxin Ke, Weijun Luo, Guangrui Xia, Kuan Yew Cheong, Feng Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, the potential of single crystalline 4H-polytype silicon carbide (4H-SiC) based microelectromechanical structures as resistance thermometer for high temperature sensing were explored. A dopant-selective photoelectrochemical etching process was applied to release the sensing element – suspended microstructures on 4H-SiC substrate. Residual stress and stress gradient in the microstructure before and after release was examined by micro-Raman spectroscopy. Electrical resistance of the suspended microstructures at different temperatures were characterized and analyzed by a temperature-dependent electron mobility model.

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Real-Time Flood Forecasting And Information System For The State Of Iowa, Witoldld F. Krajewski, Daniel Ceynar, Ibrahim Demir, Radoslaw Goska, Anton Kruger, Carmen Langel, Ricardo Mantilllla, James Niemeier, Felipe Quintero, Bong Chul Seo, Scott J. Smallll, Larry J. Weber, Nathan C. Young Mar 2017

Real-Time Flood Forecasting And Information System For The State Of Iowa, Witoldld F. Krajewski, Daniel Ceynar, Ibrahim Demir, Radoslaw Goska, Anton Kruger, Carmen Langel, Ricardo Mantilllla, James Niemeier, Felipe Quintero, Bong Chul Seo, Scott J. Smallll, Larry J. Weber, Nathan C. Young

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Iowa Flood Center's automated real-time flood forecasting and information system serves as a complement to the National Water Center's proposed national system.

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Measurements Of Dermal Uptake Of Nicotine Directly From Air And Clothing, G. Bekö, Glenn Morrison, C. J. Weschler, H. M. Koch, C. Pälmke, T. Salthammer, T. Schripp, J. Toftum, G. Clausen Mar 2017

Measurements Of Dermal Uptake Of Nicotine Directly From Air And Clothing, G. Bekö, Glenn Morrison, C. J. Weschler, H. M. Koch, C. Pälmke, T. Salthammer, T. Schripp, J. Toftum, G. Clausen

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this preliminary study, we have investigated whether dermal uptake of nicotine directly from air or indirectly from clothing can be a meaningful exposure pathway. Two participants wearing only shorts and a third participant wearing clean cotton clothes were exposed to environmental tobacco smoke (ETS), generated by mechanically "smoking" cigarettes, for three hours in a chamber while breathing clean air from head-enveloping hoods. The average nicotine concentration (420 μg/m3) was comparable to the highest levels reported for smoking sections of pubs. Urine samples were collected immediately before exposure and 60-hour post-exposure for bare-skinned participants. For the clothed participant, post-exposure urine …

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A Novel Tantalum-Containing Bioglass. Part I. Structure And Solubility, Adel Mf Alhalawani, Mark R. Towler Mar 2017

A Novel Tantalum-Containing Bioglass. Part I. Structure And Solubility, Adel Mf Alhalawani, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Bio glasses are employed for surgical augmentation in a range of hard tissue applications. Tantalum is a bioactive and biocompatible transition metal that has been used as an orthopedic medical device. It has a range of biological and physical properties that make its incorporation into ionic form into bioactive glass systems promising for various clinical applications. The work herein reports the characterization and properties of novel tantalum-containing glasses. A series of glasses based on the system 48SiO2-(36-X)ZnO-6CaO-8SrO-2P2O5-XTa2O5 with X varying from 0 mol% (TA0) to 0.5 mol% (TA2) were synthesized. The …

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Sure: A Novel Approach For Self Healing Battery Starved Users Using Energy Harvesting, Mohamed Y. Selim, Ahmad Alsharoa, Ahmed E. Kamal, Mohammed Alnuem Mar 2017

Sure: A Novel Approach For Self Healing Battery Starved Users Using Energy Harvesting, Mohamed Y. Selim, Ahmad Alsharoa, Ahmed E. Kamal, Mohammed Alnuem

Electrical and Computer Engineering Faculty Research & Creative Works

Radio Frequency (RF) energy harvesting holds a promising future for energizing low power mobile devices in next generation wireless networks. Harvesting from a dedicated RF energy source acquires much more energy than simply harvesting from ambient RF sources. In this paper, novel Self-healing of Users equipment by RF Energy transfer scheme is introduced between the network operator and battery starved users to heal and extend their battery life time by sending dedicated energy from different sources in order to be aggregated and harvested by starved users. This approach depends on the concept of Energy as a Service where the network …

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Hypothetical Cases In Engineering Ethics, Steve Eugene Watkins Mar 2017

Hypothetical Cases In Engineering Ethics, Steve Eugene Watkins

Electrical and Computer Engineering Faculty Research & Creative Works

An important educational subject for engineering students is engineering ethics. Common instructional objectives are to develop knowledge of ethical principles, e.g. professional codes, and to apply these principles to specific situations. Case studies are useful instructional examples and exercises and cases are central to student ethics competitions. Historical case studies emphasize the relevance of ethics in engineering work. Hypothetical case studies can address specific ethical principles and provide great design flexibility. This paper discusses hypothetical cases in engineering ethics in the context of instructional exercises or student competitions. Recommendations are given for the development of versatile cases and for approaching …

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Evaluation Of Procedures To Quantify Solvent Retention In Electrospun Fibers And Facilitate Solvent Removal, Anthony R. D'Amato, Nicholas J. Schaub, Jesus M. Cardenas, Erich Franz, Deniz Rende, Alexis M. Ziemba, Ryan J. Gilbert Mar 2017

Evaluation Of Procedures To Quantify Solvent Retention In Electrospun Fibers And Facilitate Solvent Removal, Anthony R. D'Amato, Nicholas J. Schaub, Jesus M. Cardenas, Erich Franz, Deniz Rende, Alexis M. Ziemba, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Electro spun fiber scaffolds crafted from polyesters are studied extensively for potential tissue engineering applications. For translation of electro spun fibers into the clinic, the FDA requires analysis and quantification of any organic solvent that may be retained in the fibers since many organic solvents can negatively affect cells and tissues. If a significant amount of solvent is retained, then developing procedures for efficient solvent removal may enhance the clinical potential of these materials. In this study we use fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and nuclear magnetic resonance spectroscopy (NMR) to analyze solvent retention. A correlative analysis …

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