Engineering Commons^™

Exploring What Engineering Doctoral Students Aspiring To Faculty Careers Learn About Research From Faculty Mentors. Frontiers In Education, (Fie) Annual Meeting, San Antonio, Tx., Tonya Saddler

Tonya N. Saddler, Ph.D.

No abstract provided.

Theory And Computation Of Photopolymerization Induced Phase Transition And Morphology Development In Blends Of Crystalline Polymer And Photoreactive Monomer, Thein Kyu

Thein Kyu

A hypothetical phase diagram of a crystalline polymer/photoreactive monomer mixture has been calculated on the basis of phase field (PF) free energy of crystal solidification in conjunction with Flory-Huggins (FH) free energy of liquid-liquid demixing to guide the morphology development during photopolymerization of poly(ethylene oxide)/triacrylate blend. The self-consistent solution of the combined PF-FH theory exhibits a crystalline-amorphous phase diagram showing the coexistence of solid+liquid gap bound by the liquidus and solidus lines, followed by an upper critical solution temperature at a lower temperature. When photopolymerization was triggered in the isotropic region, i.e., slightly above the crystal melting transition temperatures, the …

Mineralization Of Phenol In An Improved Photocatalytic Process Assisted With Ferric Ions: Reaction Network And Kinetic Modeling, Jesus Moreira Del Rio

Jesus Moreira del Rio

No abstract provided.

Polymer , Yu Zhu

Yu Zhu

No abstract provided.

Chemistry Of Materials , Yu Zhu

Yu Zhu

No abstract provided.

Saddler, T.N., Trautvetter, L., & Mckenna, A.F. (2009, October). Prototyping The Engineer Of 2020: A Curricular Examination Of Two Exemplary Institutions Preparing Undergraduate Engineers. Frontiers In Education, (Fie) Annual Meeting, San Antonio, Tx., Tonya Saddler

Tonya N. Saddler, Ph.D.

No abstract provided.

Ultrasensitive Polymer Photodetectors, Xiong Gong

Xiong Gong

No abstract provided.

Hysteresis And Reaction Characterization Of Methane Catalytic Partial Oxidation On Rhodium Catalyst, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.

An Evaluation On Rice Husks And Pulverized Coal Blends Using A Drop Tube Furnace And A Thermogravimetric Analyzer For Application To A Blast Furnace, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.

A Service Choice Model For Optimizing Taxi Service Delivery, Shih-Fen Cheng, Xin Qu

Shih-Fen CHENG

Taxi service has undergone radical revamp in recent years. In particular, significant investments in communication system and GPS devices have improved quality of taxi services through better dispatches. In this paper, we propose to leverage on such infrastructure and build a service choice model that helps individual drivers in deciding whether to serve a specific taxi stand or not. We demonstrate the value of our model by applying it to a real-world scenario. We also highlight interesting new potential approaches that could significantly improve the quality of taxi services.

Effect Of External Energy On Atomic, Crystalline And Powder Characteristics Of Antimony And Bismuth Powders, Mahendra Kumar Trivedi, Vikram V. Dabhade, Rama Mohan Tallapragada

Mahendra Kumar Trivedi

Vuv Photostability Of Prebiotic Species, M. Schwell, Y. Bénilan, M.-C. Gazeau, N. Fray, A. Jolly, Et. Es-Sebbar, N. Champion, S. Leach, H. W Jochims, H. Baumgärtel, E. Rühl

Dr. Et-touhami Es-sebbar

No abstract provided.

S.E.T.U.P. Experimental And Theoretical Simulations Useful For Planetology- Related Studies In The Frame Of A Program Of Titan’S Atmosphere Laboratory Simulations, M.-C. Gazeau, Et. Es-Sebbar, E. Arzoumanian, C. Romanzin, A. Jolly, S. Perrier, Y. Bénilan

Dr. Et-touhami Es-sebbar

No abstract provided.

Utilization Of Virtual Globes For Open Source Industrial Symbiosis, William Doyle, Joshua M. Pearce

Joshua M. Pearce

User Security Behavior On Wireless Networks: An Empirical Study, Tim Chenoweth, Robert Minch, Sharon Tabor

Robert P. Minch

Wireless networks are rapidly becoming ubiquitous but are often insecure and leave users responsible for their own security. We empirically study whether users are successfully securing their client computers when using wireless networks. Automated techniques are used that scan users' machines after they associate with a university wireless network. This determines whether a firewall is being used and what TCP ports are open. Results show that over 9% of 3,331 unique computers scanned were not using a properly configured firewall. In addition, almost 9% had at least one TCP port open, with almost 6% having open ports with significant security …

An Exploratory Study Of Hypermedia Support For Problem Decomposition, Robert P. Minch, Gary I. Green

Robert P. Minch

Empirical hypermedia research has concentrated on usability rather than utility, and the research on utility has focused on information access as opposed to problem solving and decision making in organizations. This study, based on problem reduction theory, uses a hypermedia prototype system to support decision processes for solving a financial analysis problem. An exploratory laboratory experiment was conducted to study the feasibility of the prototype for hypermedia support of decision making. The process tracing techniques used suggest that a cognitive map of a decision maker's thought process may be constructed. Results offer a great deal of promise in the use …

Mitigation Of Control Channel Jamming Under Node Capture Attacks, Patrick Tague, Mingyan Li, Radha Poovendran

Patrick Tague

Availability of service in many wireless networks depends on the ability for network users to establish and maintain communication channels using control messages from base stations and other users. An adversary with knowledge of the underlying communication protocol can mount an efficient denial of service attack by jamming the communication channels used to exchange control messages. The use of spread spectrum techniques can deter an external adversary from such control channel jamming attacks. However, malicious colluding insiders or an adversary who captures or compromises system users are not deterred by spread spectrum, as they know the required spreading sequences. For …

Simulation Of Mc-Ds-Cdma-System Based On: Multi-Wavelets Transform Over Wireless Channel, Amean Al_Safi

Amean S Al_Safi

In this paper a scheme was proposed to improve the performance form the Bit Error Rate (BER) view point for Multicarrier-Direct-Sequence-Code Division Multiple Access (MC-DS-CDMA) system in wireless channel. The conventional MC-DS-CDMA-system is based on Fast Fourier Transform (FFT). The proposed system was based on Multi-Wavelet transform (MWT). Simulation results are done in three different types of channels. Simulation shows that the proposed system outperforms the conventional system in addition to a coded version of the conventional system. Also the MC-DS-CDMA-system which is based on MWT achieves better performance with the same loss in bandwidth than the MC-DS-CDMA-system based on …

On The Issue Of Decoupled Decoding Of Codes Derived From Quaternion Orthogonal Designs, Tadeusz Wysocki, Beata Wysocki, Sarah Spence Adams

Sarah Spence Adams

Quaternion orthogonal designs (QODs) have been previously introduced as a basis for orthogonal space-time polarization block codes (OSTPBCs). This note will serve to correct statements concerning the optimality of a decoupled maximum-likelihood (ML) decoding algorithm. It will be shown that when compared to coupled decoding, the decoupled decoding is only optimal in certain cases. This raises several open problems concerning the decoding of OSTPBCs.

Mass-Market Designed-For-Cellular Mmics Can Be Gainfully Adapted For Use In Niche Applications On Different Frequencies, Chin-Leong Lim

Chin-Leong Lim

Due to semiconductor manufacturers’ near exclusive focus on high growth markets such as cellular and wireless data, very little commercial RND resource is expended on developing Microwave Monolithic Integrated Circuits (MMIC) for the lower-volume traditional wireless services such as aviation and land mobile, etc. To circumvent the dearth of MMICs in those under-served market segments, we intend to show how off-the-shelf cellular MMICs can be leveraged into non-cellular applications. For this purpose, a MMIC originally conceived as a 900 MHz 0.5W driver amplifier is redeployed to two dissimilar applications: (i) a high linearity Low Noise Amplifier (LNA) for the 400~520 …

Power Handling And Related Frequency Scaling Advantages In Piezoelectric Aln Contour-Mode Mems Resonators, Chengjie Zuo, Matteo Rinaldi, Gianluca Piazza

Matteo Rinaldi

This paper reports on the analytical modeling and experimental verification of the mechanically-limited power handling and nonlinearity in piezoelectric aluminum nitride (AlN) contour-mode resonators (CMR) having different electrode configurations (thickness field excitation, lateral field excitation, one-port and two-port configurations) and operating at different frequencies (177-3047 MHz). Despite its simplicity, the one-dimensional analytical model fits the experimental behavior of AlN CMRs in terms of power handling capabilities. The model and experiment also confirm the advantage of scaling (i.e. miniaturizing) the AlN CMRs to higher frequencies at which higher critical power density can be more easily attained up to values in excess …

Can Dg Units Provide A New Paradigm For Developing Countries Distribution Networks Enhancement? An Evaluation Of Their Technical Benefits, Nasser G. A. Hemdan Dr. Ing., Michael Kurrat Prof. Dr.

Dr.-Ing. Nasser Hemdan

Abstract— In developing countries, where the utilities already facing the problem of high power losses and poor voltage profiles because of high loads, DG can be the key answer to solve these questions while expansion and reinforcement of these systems to meet the increasing load demand are faced by economical and environmental difficulties. An evaluation of some technical benefits of integration of DG into MV distribution networks are presented in this paper. An efficient methodology for integration of DG units for meeting the increased load demand is also introduced. Kurzfassung— In Entwicklungsländern, wo die Netzbetreibern, die bereits dem Problem von …

Photocatalytic Reactor Efficiency Factor For The Complete Spam Of Reaction Times, Benito Serrano Rosales, Jesus Moreira Del Rio, Hugo De Lasa

Jesus Moreira del Rio

No abstract provided.

Rna Search With Decision Trees And Partial Covariance Models, Jennifer A. Smith

Jennifer A. Smith

The use of partial covariance models to search for RNA family members in genomic sequence databases is explored. The partial models are formed from contiguous subranges of the overall RNA family multiple alignment columns. A binary decision-tree framework is presented for choosing the order to apply the partial models and the score thresholds on which to make the decisions. The decision trees are chosen to minimize computation time subject to the constraint that all of the training sequences are passed to the full covariance model for final evaluation. Computational intelligence methods are suggested to select the decision tree since the …

Protecting Airline Passengers In The Age Of Terrorism Chapter:Preparing For In-Flight Security Threats, Lori Brown

Lori J. Brown

When it comes to airline security, there is nothing more important than getting people to their destinations safely. Transportation security is also a key component in the overall mission of protecting the nation against terrorist attacks. But airline security is a tricky goal—how do you achieve acceptable levels of security at a reasonable cost and without unduly inconveniencing passengers or invading their privacy? That's exactly what this book is about. Experts examine the latest thinking and analyze the latest research on air passenger security, discuss current practices, and show how technology can solve myriad problems. The book will, in short, …

Piezoelectric Aluminum Nitride Nanoelectromechanical Actuators, Nipun Sinha, Graham Wabiszewski, Rashed Mahameed, Valery Felmetsger, Shawn Tanner, Robert Carpick, Gianluca Piazza

Nipun Sinha

This letter reports the implementation of ultrathin (100 nm) aluminum nitride (AlN) piezoelectric layers for the fabrication of vertically deflecting nanoactuators. The films exhibit an average piezoelectric coefficient (d31~−1.9 pC/N), which is comparable to its microscale counterpart. This allows vertical deflections as large as 40 nm from 18 µm long and 350 nm thick multilayer cantilever bimorph beams with 2 V actuation. Furthermore, in-plane stress and stress gradients have been simultaneously controlled. The films exhibit leakage currents lower than 2 nA/cm2 at 1 V, and have an average relative dielectric constant of approximately 9.2 (as in thicker films). These material …

Quantifying Rooftop Solar Photovoltaic Potential For Regional Renewable Energy Policy, L. K. Winginton, H. T. Nguyen, Joshua M. Pearce

Joshua M. Pearce

Expanding Photovoltaic Penetration With Residential Distributed Generation From Hybrid Solar Photovoltaic Combined Heat And Power Systems, Joshua M. Pearce

Joshua M. Pearce

Ultra-Thin Super High Frequency Two-Port Aln Contour-Mode Resonators And Filters, Matteo Rinaldi, Chiara Zuniga, Chengjie Zuo, Gianluca Piazza

Matteo Rinaldi

This paper reports on the demonstration of a new class of ultra-thin (250 nm thick) Super High Frequency (SHF) AlN piezoelectric two-port resonators and filters. A thickness field excitation scheme was employed to excite a higher order contour extensional mode of vibration in an AlN nano plate (250 nm thick) above 3 GHz and synthesize a 1.96 GHz narrow-bandwidth channel-select filter. The devices of this work are able to operate over a frequency range from 1.9 to 3.5 GHz and are employed to synthesize the highest frequency MEMS filter based on electrically self-coupled AlN contour-mode resonators. Very narrow bandwidth (~ …

A Review On Load Flow Studies, Dr. Adel A. Elbaset

Dr. Adel A. Elbaset

No abstract provided.