Engineering Commons^™

Scarcely Populated Uwb-Ir Systems With Interleaved Coding-Modulation On Multipath Fading Channels, Michal M. Pietrzyk, Keni Popovski, Tadeusz Wysocki, Beata J. Wysocki, Jos H. Weber

Department of Electrical and Computer Engineering: Faculty Publications (to 2015)

Interleaved coding-modulation (ICM) is a recently proposed method for ultra-wideband impulse radio (UWBIR) systems. ICM exploits the concept of chip interleaving, allowing to alleviate the problem of inter-symbol and inter-pulse interference commonly present in high data rate UWB-IR systems. In this paper, previous work on ICM is extended to scarcely populated multi-user scenarios. A novel design of a deterministic chip interleaver based on time-hopping hyperbolic congruence sequences is proposed. Furthermore, the main parameters of the random and hyperbolic interleavers are reviewed. The obtained results indicate that the proposed type of interleaver yields similar performance to random interleavers but with the …

Class Exercise For Assessing Abilities And Providing A Structure For A Course, Paul Savory

Department of Industrial and Management Systems Engineering: Instructional Materials

I developed this class exercise to assess students abilities and to highlight the range of questions/issues that they will learn in my IMSE 440/840 (Discrete Event Computer Simulation) course. I draw a picture of the case scenario for students and explain the system’s operation to them. I then ask that they complete the questions regarding the system and/or how they would analyze it. Following class, I develop a summary of the range of student answers. At the next class session, I share the range of answers and share what my answers would be and how these questions/topics relate to what …

Performance Comparison Ofuwb Hopping Codes In A Multi-User Rich Scattering Environment, K. Popovski, B. J. Wysocki, Tadeusz Wysocki

Department of Electrical and Computer Engineering: Faculty Publications (to 2015)

Ultra Wideband is a short-range wireless communication technique which has seen increased interest over the past decade. Having several methods of implementation, a key issue will always be the avoidance of multi-user interference. For time-hopped Ultra Wideband, this is achieved through the use of different codes assigned to each user, performing time-hopped code division multiple access.
This paper presents a performance comparison of several time hopping sequence construction methods. It presents correlation results between sequences, and simulation results in a Gaussian noise degraded, scattering rich multi-user environment. Simulations are based on the IEEE channel model for UWB communications.

Differences Between Tethered Polyelectrolyte Chains On Bare Mica And Hydrophobically Modified Mica, Marc Balastre, Phillip Schorr, J.-F. Argillier, Jinchuan Yang, Jimmy W. Mays, Matthew Tirrell

United States Department of Energy: Publications

This study investigates the structures of layers of amphiphilic diblock copolymers of poly(t-butyl styrene)-poly- (styrene sulfonate) (PtBS-PSS) adsorbed on both the bare mica surface (hydrophilic) and an octadecyltriethoxysilane (OTE)-modified mica surface (hydrophobic). When the surface is rendered hydrophobic, the nonsoluble block exhibits stronger interaction with the surface and higher adsorbed masses are achieved. Interaction forces between two such adsorbed layers on both substrates were measured using the surface forces apparatus. The effect of salt concentration (Cs) and molecular weight (N) on the height of the self-assembled layers (L₀) was examined in each case. The resulting scaling relationship is …

Changes In Uranium Speciation Through A Depth Sequence Of Contaminated Hanford Sediments, Jeffrey Catalano, James Mckinley, John M. Zachara, Steve Heald, Steven Smith, Gordon Brown Jr.

United States Department of Energy: Publications

The disposal of basic sodium aluminate and acidic U(VI)-Cu(II) wastes in the now-dry North and South 300 A Process Ponds at the Hanford site resulted in a groundwater plume of U(VI). To gain insight into the geochemical processes that occurred during waste disposal and those affecting the current and future fate and transport of this uranium plume, the solid-phase speciation of uranium in a depth sequence of sediments from the base of the North Process Pond through the vadose zone to groundwater was investigated using standard chemical and mineralogical analyses, electron and X-ray microprobe measurements, and X-ray absorption fine structure …

Field-Scale Demonstration Of Induced Biogeochemical Reductive Dechlorination At Dover Air Force Base, Dover, Delaware, Lonnie G. Kennedy, Jess W. Everett, Erica Becvar, Donald Defeo

United States Air Force: Publications

Biogeochemical reductive dechlorination (BiRD) is a new remediation approach for chlorinated aliphatic hydrocarbons (CAHs). The approach stimulates common sulfate-reducing soil bacteria, facilitating the geochemical conversion of native iron minerals into iron sulfides. Iron sulfides have the ability to chemically reduce many common CAH compounds including PCE, TCE, DCE, similar to zero valent iron (Fe⁰). Results of a field test at Dover Air Force Base, Dover, Delaware, are given in this paper. BiRD was stimulated by direct injection of Epson salt (MgSO₄·7H₂O) and sodium (L) lactate (NaC₃H₅O₃) in five …

U.S. Army Corps Of Engineers Omaha District Monthly Drought Report, March 2006

United States Army Corps of Engineers, Omaha District

Current Conditions

Water Year 2006 Mountain Snow

Drought Outlook

Ft. Peck, Montana

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Garrison, North Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Boat Ramp Information

Noxious Weeds Overview

Cultural Resources Overview

Other Areas of Interest/Concern

Oahe, South Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Mainstem Reservoir Information, Weekly Elevation Comparison 5 DEC 2005 through 26 DEC 2005

Mainstem Reservoir Storage Comparison Water Year 2004 vs. Water Year 2005

Ft. Peck, MT

Garrison, ND

Oahe, SD

A Measurement Of Electron-Wall Interactions Using Transmission Diffraction From Nanofabricated Gratings, Brett E. Barwick, Glen Gronniger, Lu Yuan, Sy-Hwang Liou, Herman Batelaan

Materials Research Science and Engineering Center: Faculty Publications

Electron diffraction from metal coated freestanding nanofabricated gratings is presented, with a quantitative path integral analysis of the electron-grating interactions. Electron diffraction out to the 20th order was observed indicating the high quality of our nanofabricated gratings. The electron beam is collimated to its diffraction limit with ion-milled material slits. Our path integral analysis is first tested against single slit electron diffraction, and then further expanded with the same theoretical approach to describe grating diffraction. Rotation of the grating with respect to the incident electron beam varies the effective distance between the electron and grating bars. This allows the measurement …

U.S. Army Corps Of Engineers Omaha District Monthly Drought Report, August 2006

United States Army Corps of Engineers, Omaha District

Current Conditions

Drought Outlook

Ft. Peck, Montana

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Garrison, North Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Boat Ramp Information

Noxious Weeds Overview

Cultural Resources Overview

Other Areas of Interest/Concern

Oahe, South Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Mainstem Reservoir Information, Weekly Elevation Comparison 5 JUN 2006 through 26 JUN 2006

Mainstem Reservoir Storage Comparison Water Years 2004, 2005, 2006

Ft. Peck, MT

Garrison, ND

Oahe, SD

U.S. Army Corps Of Engineers Omaha District Monthly Drought Report, July 2006

United States Army Corps of Engineers, Omaha District

Current Conditions

Water Year 2006 Mountain Snow

Drought Outlook

Ft. Peck, Montana

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Garrison, North Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Boat Ramp Information

Noxious Weeds Overview

Cultural Resources Overview

Other Areas of Interest/Concern

Oahe, South Dakota

Reservoir Elevation Overview

Water Intake Overview

Access Overview

Noxious Weeds Overview

Cultural Resources Overview

Mainstem Reservoir Information, Weekly Elevation Comparison 5 JUN 2006 through 26 JUN 2006

Mainstem Reservoir Storage Comparison Water Years 2004, 2005, 2006

Ft. Peck, MT

Garrison, ND

Oahe, SD

Modeling Selected Properties Of Extruded Rice Flour And Rice Starch By Neural Networks And Statistics, G. Ganjyal, Milford A. Hanna, P. Supprung, A. Noomhorm, David D. Jones

Industrial Agricultural Products Center: Publications and Information

Rice flour and rice starch were single-screw extruded and selected product properties were determined. Neural network (NN) models were developed for prediction of individual product properties, which performed better than the regression models. Multiple input and multiple output (MIMO) models were developed to simultaneously predict five product properties or three product properties from three input parameters; they were extremely efficient in predictions with values of R² > 0.95. All models were feed-forward backpropagation NN with three-layered networks with logistic activation function for the hidden layer and the output layers. Also, model parameters were very similar except for the number of …

The Role Of Electrospinning In The Emerging Field Of Nanomedicine, S. Y. Chew, Y. Wen, Yuris A. Dzenis, K. W. Leong

Department of Mechanical and Materials Engineering: Faculty Publications

The fact that in vivo the extracellular matrix or substratum with which cells interact often includes topography at the nanoscale underscores the importance of investigating cell-substrate interactions and performing cell culture at the submicron scale. An important and exciting direction of research in nanomedicine would be to gain an understanding and exploit the cellular response to nanostructures. Electrospinning is a simple and versatile technique that can produce a macroporous scaffold comprising randomly oriented or aligned nanofibers. It can also accommodate the incorporation of drug delivery function into the fibrous scaffold. Endowed with both topographical and biochemical signals such electrospun nanofibrous …

Test 1891: Kubota L5030 Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1881: Mccormick Xtx 200/Mtx 185 Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1875: Challenger Mt 635b Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1878: Challenger Mt 665b Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1883: Agco Lt75a Diesel, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Test 1889: John Deere 8430t 16 Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

No abstract provided.

Performance Evaluation Of The Permanent New Jersey Safety Shape Barrier – Update To Nchrp 350 Test No. 4-12 (2214nj-2), Karla A. Polivka, Ronald K. Faller, Dean L. Sicking, John R. Rohde, Robert W. Bielenberg, John D. Reid, Brian A. Coon

Mid-America Transportation Center: Final Reports and Technical Briefs

Based on the proposed changes to the National Cooperative Highway Research Program (NCHRP) Report No. 350 guidelines, NCHRP Project 22-14(2) researchers deemed it appropriate to evaluate permanent safety shape barrier systems prior to finalizing the new crash testing procedures and guidelines. For this effort, the permanent New Jersey Safety Shape barrier was selected for evaluation. One full-scale vehicle crash test was performed on the longitudinal barrier system in accordance with the Test Level 4 (TL-4) requirements presented in the Update to NCHRP Report No. 350. For the permanent barrier testing program, a 10000S single unit truck was used.

The permanent …

Nanobiomagnetics, Diandra Leslie-Pelecky, V. Labhasetwar, R. H. Kraus Jr.

Materials Research Science and Engineering Center: Faculty Publications

The application of nanomagnetic materials to biological systems has produced significant advances in research, diagnosis, and treatment of numerous pathologies. This chapter summarizes the major applications of magnetic materials: magnetic targeting, drug and gene delivery, magnetic separation, the use of magnetic beads in manipulating single molecules, as contrast agents in magnetic resonance imaging, and for hyperthermia. Biocompatibility requirements for magnetic materials used in these applications are reviewed.

“Nanobiomagnetism” is the intersection of nanomagnetism and medicine that focuses on biological systems and/or processes. Magnetism is an inherent facet of life, from iron in blood to the ability of magnetotactic bacteria, birds, …

Understanding And Control Of Lateral Contraction In Stamping Lithography, Zheng Li, Li Tan, Gang-Yu Liu

Materials Research Science and Engineering Center: Faculty Publications

Thin film contraction under external mechanical stress can be used to miniaturize size and increase density of patterned features on top. Nonlinear Finite Element Analysis is used to provide guidance on this contraction process. It was found that the substrate contraction causes stress accumulation along interfaces between protruded features and substrate. These stress accumulation complexes the control of profile changes on patterned features and suggest a design of patterned features arranged beyond a critical distance to avoid cross-interference.

Magnetic Aging, Ralph Skomski, Jian Zhou, Roger D. Kirby, David J. Sellmyer

Materials Research Science and Engineering Center: Faculty Publications

Thermally activated magnetization reversal is of great importance in areas such as permanent magnetism and magnetic recording. In spite of many decades of scientific research, the phenomenon of slow magnetization dynamics has remained partially controversial. It is now well-established that the main mechanism is thermally activated magnetization reversal, as contrasted to eddy currents and structural aging, but the identification of the involved energy barriers remains a challenge for many systems. Thermally activated slow magnetization processes proceed over energy barriers whose structure is determined by the micromagnetic free energy. This restricts the range of physically meaningful energy barriers. An analysis of …

Effects Of Ion-Beam Irradiation On The L10 Phase Transformation And Their Magnetic Properties Of Fept And Ptmn Films (Invited), Chih-Huang Lai, Sheng-Huang Huang, Cheng-Han Yang, C.C. Chiang, Sy_Hwang Liou, David J. Sellmyer, M. L. Yan, L. Yuan, T. Yokata

Materials Research Science and Engineering Center: Faculty Publications

In this paper, we illustrate how to modify the structure and magnetic properties of L1₀ FePt and PtMn films using ion-beam irradiation. Highly ordered L1₀ FePt and PtMn phases were achieved directly by using 2 MeV He-ion irradiation without conventional post-annealing. A high ion-beam current density (~μA/cm² ) was used to achieve direct beam heating on samples. This irradiation-induced heating process provides efficient microscopic energy transfer and creates excess point defects, which significantly enhances the diffusion and promotes the formation of the ordered L1₀ phase. In-plane coercivity of FePt films greater than 5700 Oe could be …

Surface Segregation In Multicomponent Clusters, Peter A. Dowben, Ning Wu, Natalie Palina, H. Modrow, R. Müller, J. Hormes, Yaroslav B. Losovyj

Materials Research Science and Engineering Center: Faculty Publications

Nanostructured materials are not immune from surface segregation, as can be shown for solid samples made from nanosized BaFe_12-2xCo_xTi_xO₁₉ barium ferrite particles and a variety of free clusters. Both theory and experiment provide ample demonstration that very limited dimensions of very small clusters does not necessarily impart stability against surface and grain boundary segregation. In fact, with the larger surface to volume ratio in small clusters and lower average atomic coordination, we anticipate that compositional instabilities in small clusters will readily occur.

Force Protection Using Composite Sandwich Structures, R. L. Sierakowski, M. L. Hughes

United States Air Force: Publications

In the recent past, advances have been made in the attempt to utilize composite materials as components in protective structures such as those employed by the Air Force to secure critical military assets. In such applications, where lightweight materials that exhibit large levels of energy absorption and high strength/stiffness characteristics are desirable, composite sandwich constructions offer an attractive solution.

In an attempt to evaluate the suitability of certain sandwich structures for use in force protection applications, several sandwich constructions with somewhat novel core materials were identified. A group of thermoplastic core materials have been developed that possess features of both …

United States Air Force Posture Statement 2006, U.S. Air Force

United States Air Force: Publications

Over a century ago, America crossed the threshold of powered flight and gave wings to the world. Soon military leaders realized the implications of this development, and warfare was changed forever. America was fortunate to have "Great Captains" with the vision to imagine the possibilities of air and space power - Airmen like Billy Mitchell, Frank Andrews, Hap Arnold, Ira Eaker, Jimmy Doolittle, Bennie Schriever. They have given us a proud heritage of courage, excellence and innovation. In so doing, they also give us a sense of perspective and a way to understand the Air Force's future.

Photoionization Of Xenon Clusters, John D. Bozek, Bruce S. Rude, A. L. D. Kilcoyne

United States Department of Energy: Publications

High resolution photoelectron spectra of xenon clusters of about 100 atoms, measured with photon energies of 20 to 60 eV are reported. Peaks due to the clusters are observed at lower binding energies than the corresponding atomic lines and exhibit different behaviors. The peak associated with the Xe 5p_1/2 state at higher binding energy is relatively unchanged with photon energy whereas the Xe 5p_3/2 peak changes its shape with increasing photon energy. The change is attributed to differences in the escape depth of the electrons at different kinetic energies and the bulk and surface components of the cluster.

Pipeline Inspection Technologies Demonstration Report Final

United States Department of Transportation: Publications

The pipeline infrastructure is a critical element in the energy delivery system across the United States. Its failure can affect both public health and safety directly and indirectly through impacts on the energy supply. The pipeline infrastructure is aging, while at the same time Research & Development (R&D) funding from the pipeline industry to develop technologies to assure its integrity is experiencing budgetary constraints. Total R&D funding is being further reduced through the elimination of programs resulting from restructuring within the government and energy industry.

The Pipeline & Hazardous Materials Safety Administration (PHMSA), Pipeline Safety R&D Program mission is to …

Peer Review Report 2006

United States Department of Transportation: Publications

This document is reporting findings from the research peer reviews held February 7-9, 2006 for PHMSA’s Pipeline Safety Research and Development Program. The findings and recommendations in this report derive from the scoring and comments collected from the peer review panelists.

Department of Transportation (DOT) Operating Agencies (OA) are required to begin a systematic process for peer review planning for all influential and highly influential information that the OA plans to disseminate in the “foreseeable” future.

Through the Information Quality Act, Congress directed Office of Management and Budget (OMB) to “provide policy and procedural guidance to Federal agencies for ensuring …

Rd&T Program Overview 2006

United States Department of Transportation: Publications

PHMSA Mission

PHMSA Supports DOT Goals

RD&T Overview

PHMSA RD&T Program Appropriations

Pipeline Safety RD&T

Pipeline Safety RD&T Hierarchy

Systematic RD&T Implementation

Safety

Environment

Hazardous Materials Safety RD&T

Safety -- Global Connectivity -- Environmental Stewardship -- Security: Strategies

Safety -- Global Connectivity -- Environmental Stewardship -- Security: Future Trends and Developments

Safety -- Global Connectivity -- Environmental Stewardship -- Security: Anticipated RD&T Needs

Hazmat Elements & Goals

Hazmat Elements & Possible Products

Hazardous Materials Transportation Cooperative Research Program

PHMSA RD&T Contacts