Engineering Commons^™

Applications Of Underground Structures For The Protection Of Critical Infrastructure, George H. Baker, Richard G. Little, Don A. Linger

George H Baker

The U.S. President’s Commission on Critical Infrastructure Protection (PCCIP), convened in the wake of the bombing of the Murrah Federal Building in Oklahoma City, concluded that the nation’s physical security and economic security depend on our critical energy, communications, and computer infrastructures. While a primary motivating event for the establishment of the commission was the catastrophic physical attack of the Murrah Building, it is ironic that the commission focused its attention primarily on cyber threats. Their rationale was that cyber vulnerabilities posed a new, unaddressed challenge to infrastructure security. This approach was further questioned by the events of September 11, …

Supervisory Control And Data Acquisition (Scada) Systems, George H. Baker, Allan Berg

George H Baker

Our critical national infrastructure systems have become almost universally dependent upon computer-based control systems technically referred to as supervisory control and data acquisition (SCADA) systems. SCADA systems evolved from the telemetry and event-alarm systems developed in the early days of utilities. With the widespread use of SCADA systems, computers have become the "basis element" for much of our critical infrastructure. Thus, the disruption of controlling computer terminals and networks due to natural disasters, electric power failure, accidents or malicious activity can have catastrophic consequences.

On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film

A.S. Md Abdul Haseeb

A hard Fe-0.96 mass pet C alloy with a hardness value of 810 HV has been electrochemically synthesized from a ferrous sulfate bath containing a small amount of citric acid and L-ascorbic acid. The nature of the alloy has been investigated by a number of techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic measurements. The decomposition behavior of the alloy is also studied and compared with that of thermally prepared martensite. It has been found that the electrochemically deposited Fe-C alloy exists in …

Sustainability Issues In A Pollution Prevention Course, R. Counce, Samuel Morton, L. Perkin

Samuel A Morton

No abstract provided.

Prediction Of Solid Surface Cleaning In Aqueous Surfactant Solutions: A Thermodynamic Approach, Samuel Morton, D. Keffer, A. Davis, R. Counce, D. Depaoli, M. Hu

Samuel A Morton

No abstract provided.

Roentgen's First Public Lecture, Fathi Habashi

Fathi Habashi

Delivering On The 256 Qam Promise, Ron D. Katznelson

Ron D. Katznelson

The accumulation of degradation factors in the downstream channels is reviewed with focus on headend/hub transmission-related noise aggregation due to a plurality of downstream Quadrature Amplitude Modulation (QAM) transmitters and upconverters. Substantial increase in the number of QAM transmitters based on frequency agile upconverters is expected. Unlike fixed channel upconverters, these do not have narrow band filters at their output, consequently imparting appreciable levels of broadband noise on the network when several such units are combined. Based on these factors and other noise contributions, it is shown that additional impairments due to fluctuations associated with composite distortion terms on the …

High-Efficiency Polymer-Based Electrophosphorescent Devices, Xiong Gong

Xiong Gong

High efficiency electrophosphorescence has been achieved by using [Ir(DPF)3]-doped polyvinylcarbazole/biphenyl-1,3,4-oxadiazole co-polymers (see Figure). Light-emitting devices with luminous efficiencies up to 36 cd/A can be realized with polymeric host/heavy metal complex guest systems, fabricated by processing the luminescent layer from solution.

Method Of Manufacturing A Semiconductor Wafer Level Package, Us Patent # 6,465,281, Daxue Xu, Henry H. Hughes, Paul L. Bergstorm, Frank A. Shemansky, Hak-Yam Tsoi

Paul Bergstrom

Decentralized Adaptive Coordination And Control Of Uninhabited Autonomous Vehicles Via Surrogate Optimization, Raúl Ordóñez

Raúl Ordóñez

No abstract provided.

The Seabed Auv — A Platform For High Resolution Imaging, Hanumant Singh, Ryan Eustice, Christopher Roman, Oscar Pizarro

Christopher N. Roman

No abstract provided.

Analytical Model For The Optical Functions Of Amorphous Semiconductors From The Near-Infrared To Ultraviolet: Applications In Thin Film Photovoltaics, A. S. Ferlauto, G. M. Ferreira, Joshua M. Pearce, C. R. Wronski, R. W. Collins, Xunming Deng, Gautam Ganguly

Joshua M. Pearce

Struggles Of The ‘Father’, Aimee Dechambeau

Aimée L. deChambeau

Biographical account of Konstantin Eduardovich Tsiolkovsky, the father of Soviet cosmonautics.

Maximization Of The Open Circuit Voltage For Hydrogenated Amorphous Silicon N–I–P Solar Cells By Incorporation Of Protocrystalline Silicon P-Type Layers, R. J. Koval, Chi Chen, G. M. Ferreira, A. S. Ferlauto, Joshua M. Pearce, P. I. Rovira, C. R. Wronski, R. W. Collins

Joshua M. Pearce

An Analysis Of Gas Absorption By A Liquid Aerosol In A Stationary Environment, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.

Functional Profiling Of The Saccharomyces Cerevisiae Genome, Patrick Flaherty

Patrick Flaherty

Thermodynamic Prediction Of Surfactant Enhanced Solid Surface Cleaning, Samuel Morton, D. Keffer, A. Davis, R. Counce, D. Depaoli, M. Hu

Samuel A Morton

No abstract provided.

Enhanced Removal Of Oils From Surfaces: The Effect Of Ionic Strength On Cleaning, A. Davis, Samuel Morton, R. Counce, D. Depaoli, M. Hu

Samuel A Morton

No abstract provided.

New Bounds For The Firing Squad Problem On A Ring, Amber Settle, Andre Berthiaume, Ljubomir Perković, Janos Simon

Amber Settle

No abstract provided.

Photovoltaics — A Path To Sustainable Futures, Joshua M. Pearce

Joshua M. Pearce

Multiscalar, Multisensor Search And Survey With Hovering Auvs, Christopher Roman, Hanumant Singh

Christopher N. Roman

No abstract provided.

Isoform-Specific Stimulation Of Cardiac Na/K Pumps By Nanomolar Concentrations Of Glycosides., Glenn Gaudette, Junyuan Gao, Randy Wymore, Yongli Wang, Irvin Krukenkamp, Ira Cohen, Richard Mathias

Glenn R. Gaudette

It is well-known that micromolar to millimolar concentrations of cardiac glycosides inhibit Na/K pump activity, however, some early reports suggested nanomolar concentrations of these glycosides stimulate activity. These early reports were based on indirect measurements in multicellular preparations, hence, there was some uncertainty whether ion accumulation/depletion rather than pump stimulation caused the observations. Here, we utilize the whole-cell patch-clamp technique on isolated cardiac myocytes to directly measure Na/K pump current (I(P)) in conditions that minimize the possibility of ion accumulation/depletion causing the observed effects. In guinea pig ventricular myocytes, nanomolar concentrations of dihydro-ouabain (DHO) caused an outward current that appeared …

Interoperability Standards In The Semantic Web, Steven Ray

Steven R Ray

The growth in the use of the Internet brings with it an increase in the number of interconnections among information systems supporting the manufacturing supply chain as well as other businesses. Each of these interconnections must be carefully prescribed to ensure interoperability. However, the sheer number of interconnections and the resulting complexity threaten to overwhelm the ability of the standards community or industry to provide the necessary specifications—a way out of this impasse must be found. This paper outlines the elements of an approach and the technology to move toward self-integrating systems, wherein the systems negotiate meaningful interfaces as needed …

Mobility Gap Profiles In Si:H Intrinsic Layers Prepared By H2 Dilution Of Sih4: Effects On The Performance Of P-I-N Solar Cells, R. J. Koval, A. S. Ferlauto, Joshua M. Pearce, R. W. Collins, C. R. Wronski

Joshua M. Pearce

Transparent Fault Tolerance For Web Services Based Architectures, Vijay Dialani, Simon Miles, Luc Moreau, David De Roure, Michael Luck

Vijay Dialani

Service-based architectures enable the development of new classes of Grid and distributed applications. One of the main capabilities provided by such systems is the dynamic and flexible integration of services, according to which services are allowed to be a part of more than one distributed system and simultaneously serve different applications. This increased flexibility in system composition makes it difficult to address classical distributed system issues such as fault-tolerance. While it is relatively easy to make an individual service fault-tolerant, improving fault-tolerance of services collaborating in multiple application scenarios is a challenging task. In this paper, we look at the …

Development Of An Autonomous Vehicles Research Laboratory, Raúl Ordóñez

Raúl Ordóñez

PI, funded by the University of Dayton Research Council, $3,800.

Oil Detachment From Solid Surfaces In Aqueous Surfactant Solutions As A Function Of Ph, A. Rowe, R. Counce, Samuel Morton, D. Depaoli, M. Hu

Samuel A Morton

No abstract provided.

Design And Construction: Building In Value, Rick Best, Gerard De Valence

Rick Best

The design and construction of buildings is a lengthy and expensive process, and those who commission buildings are continually looking for ways to improve the efficiency of the process. In this book, the second in the Building in Value series, a broad range of topics related to the processes of design and construction are explored by an international group of experts. The overall aim of the book is to look at ways that clients can improve the value for money outcomes of their decisions to construct buildings.

The book is aimed at students studying in many areas related to the …

Logic, Optimization And Constraint Programming, John Hooker

John Hooker

No abstract provided.

Results Of Audio-Visual Winter Road Condition Sensor Prototype, Kevin Mcfall, T. Niittula

Kevin McFall