Engineering Commons^™

Biofilm Mediated Calculus Formation In The Urinary Tract, Robert J. C. Mclean, David J. Stickler, J. Curtis Nickel

Cells and Materials

Mineralization and subsequent calculus formation is a common complication of biofilm infections. In the urinary tract, these infected calculi often arise from infections by urease-producing bacteria. Ammonia, liberated by bacterial urease activity, increases urine pH, resulting in the precipitation of Ca and Mg as carbonateapatite {Ca₁₀(PO₄,CO₃)₆(OH,CO₃)₂} and struvite (NH₄MgP0₄·6H₂O). These minerals become entrapped in the organic matrix which surrounds the infecting organisms and ultimately grow into mature calculi. When the causative organisms grow on urinary catheters and stents, the resulting mineralization can …

Incorporation Of Reservoirs Into Irrigation Supply Systems To Simplify Flexible Operations, John L. Merriam, Stuart W. Styles

BioResource and Agricultural Engineering

No abstract provided.

An Optimistic Concurrency Control Mechanism Based On Clock Synchronization, Myoung Jin Park

Theses Digitization Project

No abstract provided.

Impulse, Stacie Johnson, Cathy Nelson, Cindy Price, Jennifer Widman

Impulse (Jerome J. Lohr College of Engineering Publication)

Features:
[Page 2-3] SDSU College of Engineering listens to industry needs
[Page 3-4] Rosco owner helps SDSU stay tuned to industry needs
[Page 4] Engineering Extension helps companies' safety
[Page 5] Motorgrader removes snow with a wing and a plow
[Page 6-7] Task force studies how Engineering can boost economic development
[Page 8-9] EROS/SDSU connection 'heavenly'
[Page 9] Program helps meet manufacturing needs
[Page 10-11] Industries support, supply SDSU Ground Source Heat Pump Laboratory
[Page 11] Ground Source Heat Pump Laboratory moves toward accreditation
[Page 11] Remund takes over as director of Prairie Heat Pump Association
[Page 12-13] Mechanical engineering …

3-D Computer Vision Using Structured Light: Design, Calibration, And Implementation Issues, Fred W. Depiero, Mohan M. Trivedi

Electrical Engineering

Structured light (SL) sensing is a well-established method of range acquisition for computer vision. We provide thorough discussions of design issues, calibration methodologies, and implementation schemes for SL sensors. The challenges for SL sensor development are described and a range of approaches are surveyed. A novel SL sensor, PRIME, the PRofile Imaging ModulE recently has been developed and is used as a design example in the detailed discussions.

Assessment Of The Compositional Influences On The Toughness Of Ticr2-Base Laves Phase Alloys, Katherine C. Chen, Samuel M. Allen, James D. Livingston

Materials Engineering

Systematic studies of alloys based on TiCr, have been performed in order to improve the toughness of Laves phase intermetallics. The extent to which alloy compositions and annealing treatments influence the toughness was quantified by Vickers indentation. The single-phase Laves behavior was first established by studying stoichiometric and nonstoichiometric TiCr,. Next, alloying effects were investigated with ternary Laves phases based on TiCr₂. Different microstructures of two-phase alloys consisting of (Ti,Cr)-bcc+TiCr₂, were also examined. Various toughening theories based on vacancies, site-substitutions, crystal structure (C14, C36, or Cl5) stabilization, and the presence of a …

Perturbations Of Periosteel Bone During Healing: Effect Of Non-Weight Bearing, Helen E. Gruber, Mary E. Kirchen, John R. Sweeney, William E. Anderson, G. June Marshall

Cells and Materials

Weight bearing (WB) is an important factor influencing bone remodelling. The present study evaluates the effects of weight bearing and non-weight bearing (S) (achieved by tail suspension and hindlimb elevation) on the healing of a fibular osteotomy in adult male rats. After 9, 18 or 36 days under WB or S conditions, periosteum near the callus formed at the osteotomy site was compared to periosteum of the contralateral fibula (which did not receive an osteotomy) or to periosteum of fibula of control animals which did not receive an osteotomy. Data show that periosteal bone healing is sensitive to alterations in …

A Composite Biomaterial: Poly 2 (Hydropoxyethyl) Methacrylate / Alkaline Phosphatase Initiates Mineralization In Vitro, R. Filmon, D. Chappard, J. P. Monthéard, M. F. Baslé

Cells and Materials

Bone substitutes are nowadays largely used in orthopedic surgery but they lack osteoinductive properties. Poly (2-hydroxyethyl methacrylate) (pHEMA) has numerous biomedical applications. Alkaline phosphatase (AlkP), an ectoenzyme elaborated by osteoblasts, initiates bone mineralization by hydrolyzing organic phosphates before calcium-phosphorus deposition. We have immobilized AlkP in pHEMA in a copolymerization technic. Histochemical study revealed that AlkP has retained its biological activity . Image analysis of sections using a tessellation method showed a lognormal distribution of the area of tessels around AlkP particles thus confirming an homogeneous distribution of the enzyme in the polymer. Pellets of pHEMA and pHEMA + AlkP were …

Validation Of Energy Dispersive X-Ray Spectrometry As A Method To Standardize Backscattered Electron Images Of Bone, E. G. Vajda, R. D. Bloebaum, J. G. Skedros

Cells and Materials

The use of backscattered electron (BSE) imaging as a tool for the qualitative measurement of mineral content in bone has been well documented. The challenge still remains to develop BSE imaging as a tool for quantitative mineral content analysis in bone. The limiting factor has been the ability to standardize the BSE signal within and between laboratories. Energy dispersive x-ray spectrometry (EDX) has been proposed as a method to standardize the BSE operating environment. The goal of this study is to investigate the relationship between EDX-determined wt.% Ca measurements and BSE graylevels. A comparison with traditional ash content measurements will …

The Effect Of Vitronectin And Other Extracellular Matrix Molecules On Endothelial Expansion And Plasminogen Activation, P. Anne Underwood, Penny A. Bean

Cells and Materials

Endothelial recovery following procedures used to alleviate blood vessel occlusion is modulated by the local extracellular matrix upon which it has to migrate and proliferate. This extracellular material is derived from vessel wall cells, and plasma proteins which bind to the exposed surfaces. We have demonstrated that vitronectin adsorbs efficiently to tissue culture polystyrene in competition with other plasma proteins, which suggests that it may adsorb to biomaterial surfaces in vivo. We have compared the adhesion, migration and proliferation of human umbilical artery endothelial cells on surface-coated vitronectin, with other extracellular matrix molecules encountered in this environment, namely fibronectin, …

Termes De Signes Positif Et Négatif En Analyses Exergétiques Des Flux De Chaleur, Jim Mcgovern, Pierre Le Goff

Articles

In various technical plants there are heat transfer rates at temperatures above that of the environment and other simultaneous heat transfer rates at temperatures below the temperature of the environment. This is the case in cryogenic industrial processes where a cooling effect is produced from a heat source. This is also the case for all absorption refrigeration plants or absorption plants that provide refrigeration and heat pumping, notably for air-conditioning of buildings. In these cases exergetic analysis leads to equations in which some terms are positive and others are negative. This can pose problems in the definition of exergetic, or …

Hazardous Waste Management, Harold M. Cota, David Wallenstein

Civil and Environmental Engineering

Hazardous waste management is a broad and evolving field. Applicable state and federal regulations comprising over 60,000 pages are continually being updated. Many of these regulations overlap and are subject to differences in interpretation that often lead to court rulings. Regulations, economic pressures and public perception are forcing companies to rapidly change the way they manufacture products in order to minimize hazardous waste generation. Over 200 million tons of solid hazardous waste are generated annually in the United States. Huge quantities of hazardous waste deposited in landfills, ponds, fields, and other locations require removal or in situ treatment. Common hazardous …

Incorporating Matlab's Signal Processing Toolbox Into A Dsp Course At An Undergraduate E.E. Program, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

This paper provides some suggestions for incorporating MATLAB's Signal Processing Toolbox into a DSP course. Often, in a DSP course, students have difficulties understanding abstract and non-intuitive concepts and seeing their relevance to the practical part of their curriculum. The tools offered by MATLAB's Signal Processing Toolbox, can help to make these concepts more tangible and provide a perspective for students. Some basic tools relevant to an undergraduate DSP course will be introduced, including examples of tool use and graphic results. The tools presented will be applied in the areas of synthesis and analysis of signals, FFT computation, impulse response …

Knowledge-Based System For Casting Process Selection, Ahmet Er, Edward Sweeney, Voya Kondic

Articles

Design of casting entails the knowledge of various interacting factors that are unique to casting process, and, quite often, product designers do not have the required foundry-specific knowledge. Casting designers normally have to liaise with casting experts in order to ensure the product designed is castable and the optimum casting method is selected. This two-way communication results in long design lead times, and lack of it can easily lead to incorrect casting design. A computer-based system at the discretion of a design engineer can, however, alleviate this problem and enhance the prospect of casting design for manufacture. This paper proposes …

Santa Clara Magazine, Volume 38 Number 1, Winter 1996, Santa Clara University

Santa Clara Magazine

8 - GERALD UELMEN: BACK IN THE CLASSROOM The School of Law professor and co-counsel for the O.J. Simpson defense reflects on the "trial of the century" and assesses its impact on legal education. Interview by Elise Banducci '87

12 - MARRIED WITHOUT CHILDREN Childless couples challenge deeply held beliefs about marriage and family. By Kath1yn Bold '81

16 - PORTRAIT OF THE ARTIST Gerald Sullivan, S.J., answers the questions "Why figurative painting?" "Why liberal arts?" and "Why dogs?" By Miriam Schulman

20 - PASSPORT TO KNOWLEDGE Study abroad programs in Italy and around the world push beyond traditional borders. …

Ua8 Information Technology Update, Wku Information Technology

WKU Administration Documents

Newsletter created by and about WKU Information Technology.

Progress In The Smart Pixel Technologies, Harvard Scott Hinton

Electrical and Computer Engineering Faculty Publications

The purpose of this paper is to review the recent progress in the developing smart pixel technologies. The paper begins by reviewing some of the rapidly evolving smart pixel terminologies. It then describes several of the smart pixel technologies that have recently emerged. Finally, it outlines the performance of these technologies in both device complexity and aggregate capacity. The reviewed SPA technologies include both the modulator-based FET-SEED, hybrid CMOS-SEED, and LCOS smart pixels and the source-based hybrid VCSEL/MSM, ELO, flip-chip-bonded VCSEL/MSM, and monolithic MSM/MESFET/VCSEL smart pixels.

An Atm-Based Intelligent Optical Backplane Using Cmos-Seed Smart Pixel Arrays And Free- Space Optical Interconnect Modules, Dominic J. Goodwill, Kent E. Devenport, Harvard Scott Hinton

Electrical and Computer Engineering Faculty Publications

The architecture, smart pixel array chip design, and optical design of an intelligent free-space digital optical backplane for ATM switching are presented. The smart pixel chip uses reflective SEED (self-electrooptic effect device) optical modulators and detectors flip-chip bonded to CMOS circuitry. This chip is one of the most complex designs ever reported in this technology, and it operates at a simulated backplane clock rate of 125 MHz. The low-loss optical system employs f/4 diffractive minilenses and microlenses to interconnect clusters of smart pixels, and it is shown to allow 2060 connections per chip if 1-cm2 -sized smart pixel chips are …

A Hybrid-Seed Smart Pixel Array For A Four-Stage Intelligent Optical Backplane Demonstrator, David R. Rolston, David V. Plant, Ted H. Szymanski, Harvard Scott Hinton, W. S. Hsiao, Michael H. Ayliffe, David Kabal, Michael B. Venditti, P. Desai, Ashok V. Krishnamoorthy, Keith W. Goossen, J. A. Walker, B. Tseng, S. P. Hui, J. C. Cunningham, W. Y. Jan

Electrical and Computer Engineering Faculty Publications

This paper describes the VLSI design, layout, and testing of a Hybrid-SEED smart pixel array for a four-stage intelligent optical backplane. The Hybrid-SEED technology uses CMOS silicon circuitry with GaAs-AlGaAs multiple-quantum-well modulators and detectors. The chip has been designed based on the HyperPlane architecture and is composed of four smart pixels which act as a logical 4-bit parallel optical channel. It has the ability to recognize a 4-bit address header, inject electrical data onto the backplane, retransmit optical data, and extract optical data from the backplane. In addition, the smart pixel array can accommodate for optical inversions and bit permutations …

Design, Modeling, And Characterization Of Fet-Seed Smart Pixel Transceiver Arrays For Optical Backplanes, David V. Plant, Alain Z. Shang, Marcos R. Otazo, David R. Rolston, Brian Robertson, Harvard Scott Hinton

Electrical and Computer Engineering Faculty Publications

The design, modeling, and characterization of FET-SEED smart pixel transceiver arrays fabricated for application in optical backplanes are presented. Results of digital and analog measurements on 4×4 transmitter arrays and 4×4 receiver arrays, packaged at the printed circuit-board level, will be presented. In addition, these results will be compared to device and circuit models developed for these optoelectronics. Finally, the description of the successful application of these optoelectronics to interconnect two printed circuit boards will be described.

A New Creep-Fatigue Life Prediction Model, Tarun Goswami

Biomedical, Industrial & Human Factors Engineering Faculty Publications

A published creep-fatigue life prediction model is modified in this paper and assessed with data on Inconel 718 under different test conditions. It has been shown that the method developed within the viscosity concepts correlates the low-cycle fatigue data well. This paper reports the modification over the previous model.

Norway Rat Infestation Of Urban Landscaping And Preventative Design Criteria, Bruce A. Colvin, Ralph Degregorio, Charlotte Fleetwood

Vertebrate Pest Conference Proceedings: 17th (1996)

Fifty-four landscaped areas in downtown Boston were surveyed for Norway rat (Rattus norvegicus) activity. Each location also was characterized based on size, types of plantings, density of plantings, type of mulch, and sanitary and maintenance conditions. Factors most associated with the presence of rats were dense contiguous stands of shrubbery (e.g., needled evergreens) and refuse/litter availability on the ground. Design criteria should include effective spacing of shrubbery, limiting mass plantings of dense shrubs, selection of plant varieties that grow with openness underneath, strategically-placed and rodent-proof refuse containers, and use of crushed-stone inspection strips. Rodent control should be considered …

The Future Of Wildlife Damage Management—And Why I Want To Be A Part Of It, Scott R. Craven

Vertebrate Pest Conference Proceedings: 17th (1996)

Welcome to the 17th Vertebrate Pest Conference; THE conference for those of us who work in the field of vertebrate pest management. Actually, I prefer the term wildlife damage management to either animal damage control or vertebrate pest control, but as long as one takes a broad perspective on the definition of wildlife, there is really no difference except perhaps in perception. I do not mean to suggest that the name of the Vertebrate Pest Conference should be changed. It should not be changed. However, I do suggest that no matter what umbrella term you operate under, we are all …

Introducing The National Wildlife Research Center, Richard D. Curnow

Vertebrate Pest Conference Proceedings: 17th (1996)

The paper summarizes the background and historical events leading to the creation of the National Wildlife Research Center (NWRC) and describes the status of its research program and facilities development in Fort Collins, Colorado. Also, the relationship of the NWRC to the Denver Wildlife Research Center is presented.

How To Control A Pest's Pest—Flea And Rodent Efficacy, Becky Doane, Dave Blodget, Bonnie Bonnivier

Vertebrate Pest Conference Proceedings: 17th (1996)

Fleas have caused health and sanitation problems for centuries. Most rodents are hosts to fleas. Baker Crop Protection Chemicals (BCPC) recently entered the rodenticide market (via SLN) with an efficacious fumigant for single burrow rodents, MAGNACIDE^® H Herbicide/Rodenticide (a.i. acrolein). Noting that most burrowing rodents are flea infested, BCPC undertook an experiment to determine if fleas also succumb to acrolein under simulated field treatment scenarios. Results of the study under laboratory conditions demonstrated that fleas do succumb to acrolein treatments as well as the specific rodents targeted for treatment. This study also established rodent death rates from exposure to …

Frontmatter- Proceedings Seventeenth Vertebrate Pest Conference, Robert M. Timm, A. Charles Crabb

Vertebrate Pest Conference Proceedings: 17th (1996)

Contents

OPENING REMARKS - SEVENTEENTH VERTEBRATE PEST CONFERENCE
Robert M. Timm ...................1

THE FUTURE OF WILDLIFE DAMAGE MANAGEMENT-AND WHY I WANT TO BE A PART OF IT
Scott R. Craven................... 2

INTRODUCING THE NATIONAL WILDLIFE RESEARCH CENTER
Richard D. Curnow................... 6

THE STATUS OF NUISANCE WILDLIFE DAMAGE CONTROL IN THE STATES
Kristen P. LaVine, Mark J. Reeff, Jodi A. DiCamillo, and Gary S. Kania ...................8

ANALYSIS OF VERTEBRATE PEST RESEARCH
Jim Hone................... 13

TOWARDS "BEST PRACTICE" VERTEBRATE PEST MANAGEMENT IN AUSTRALIA USING VIRALLY-VECTORED IMMUNOCONTRACEPTION
Mike Braysher, Peter O'Brien, and Mary Bomford................... 18

ECOLOGICAL CHALLENGES TO CONTROLLING WILD RABBITS IN AUSTRALIA …

Animal Rights And The Need To Understand Nature; A Debate, Walter E. Howard

Vertebrate Pest Conference Proceedings: 17th (1996)

As various societies, especially in the developed countries of the world, acquired a better life-style and standard of living, a common trend developed toward treating animals more humanely, especially the domestic ones. But the movement was too slow, and the animal rights movement captured this void and established a new ethic. Unfortunately, this was done without a full appreciation of the laws of nature. Even though this movement was clearly needed, some people have carried it too far.

Tonight, hopefully, we can have some good constructive discussions from the audience on this subject after Dr. Steve Sapontzis and I first …

Impacts Of Field-Dwelling Rodents On Emerging Field Corn, Scott E. Hygnstrom, Kurt C. Vercauteren, Jason D. Eksteev

Vertebrate Pest Conference Proceedings: 17th (1996)

The Conservation Reserve Program (CRP) has produced nearly 600,000 ha of exceptional wildlife habitat in Nebraska. Unfortunately, several species of rodents that inhabit CRP grass fields cause damage to agricultural crops. The emergence of corn seedlings in a 4-row strip of no-till field corn, planted in a 64 ha bromegrass field in northeastern Nebraska was examined. The most common rodent species in the study area was the deer mouse (Peromyscus maniculatus), of which 18 were captured within 10 m of the planted strip during one evening (400 trap nights). Corn seedling emergence in unprotected control areas [x̅ = …

Reducing Livestock Depredation Losses In The Nepalese Himalaya, Rodney M. Jackson, Gary G. Ahlborn, Mahesh Gurung, Som Ale

Vertebrate Pest Conference Proceedings: 17th (1996)

In the Nepalese Himalaya conflict with rural communities due to livestock predation to large carnivores like snow leopard, common leopard, wolf and wild dog has risen sharply in recent years. This increase is attributed to a number of factors, including implementation and enforcement of wildlife protection laws (which have permitted a recovery in carnivore numbers), the creation of protected areas (which serve as refuges from which predators can populate the surrounding area), the depletion of natural prey due to poaching and loss of habitat, and lax livestock herding practices. However, little information is presently available upon which to design remedial …

Zoonotic Diseases Of Carnivores And Occupational Safety Issues For Predator Control Employees, Michele T. Jay

Vertebrate Pest Conference Proceedings: 17th (1996)

The paper highlights some important zoonotic infections of carnivores in North America. The etiologic agents, routes of transmission, reservoirs, and methods for prevention are emphasized. Occupational safety issues for people working in predator control are discussed.