Digital Commons Network^™

Microbial Cellulose Utilization: Fundamentals And Biotechnology, Lee R. Lynd, Paul J. Weimer, Willem H. Van Zyl, Isak S. Pretorius

Dartmouth Scholarship

Fundamental features of microbial cellulose utilization are examined at successively higher levels of aggregation encompassing the structure and composition of cellulosic biomass, taxonomic diversity, cellulase enzyme systems, molecular biology of cellulase enzymes, physiology of cellulolytic microorganisms, ecological aspects of cellulase-degrading communities, and rate-limiting factors in nature. The methodological basis for studying microbial cellulose utilization is considered relative to quantification of cells and enzymes in the presence of solid substrates as well as apparatus and analysis for cellulose-grown continuous cultures. Quantitative description of cellulose hydrolysis is addressed with respect to adsorption of cellulase enzymes, rates of enzymatic hydrolysis, bioenergetics of microbial …

The Evolution Of The Long Term Performance Of Fiber Reinforced Composites Materials Based On Vinyl Easter Resin, Nasser Abdullah Ali-Al Ghailani

Theses

Fiber reinforced polymer (plastic) FRP composites are different from traditional

structural materials such as steel or aluminum since the an-isotropic nature of a Fiber _ reinforced composite material creates a unique opportunity of tailoring its properties according to the design requirements. With the accelerated change in the technological sphere, FRP composite materials

have taken a paramount importance in various structural applications, where they successfully replaced conventional materials such as steel. Such success is based on the advantages offered by composite materials such as a high strength to weight ratio. However one aspect that is still delaying full acceptance of these …

Closed-Form Solution For The Size Of Plastic Zone In An Edge-Cracked Strip, Xiang-Fa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

This paper is concerned with the problem of plastic zone at the tip of an edge crack in an isotropic elastoplastic strip under anti-plane deformations. By means of complex potential and Dugdale model, the stress intensity factor and the size of plastic zone are obtained in closed-form. Furthermore, the analytic solutions for an edge crack at the free boundary of a half-space and a semi-infinite crack heading towards a free surface are determined as the limiting cases of the strip geometries.

Closed-Form Solution For A Mode-Iii Interfacial Edge Crack Between Two Bonded Dissimilar Elastic Strips, Xiangfa Wu, Yuris A. Dzenis

Department of Engineering Mechanics: Faculty Publications

A closed-form solution is obtained for the problem of a mode-III interfacial edge crack between two bonded semi-infinite dissimilar elastic strips. A general out-of-plane displacement potential for the crack interacting with a screw dislocation or a line force is constructed using conformal mapping technique and existing dislocation solutions. Based on this displacement potential, the stress intensity factor (SIF, K_III) and the energy release rate (ERR, G_III) for the interfacial edge crack are obtained explicitly. It is shown that, in the limiting special cases, the obtained results coincide with the results available in the literature. The present …

Safety Evaluation Of New Roads, Kenneth R. Agent, Jerry G. Pigman

Kentucky Transportation Center Research Report

The primary objective of this research study was to evaluate the crash history of bypass routes to determine if there were unusual patterns or changes in the crash history on these routes over the first years of operation. The focus of the evaluation was to collect data at bypass routes opened in recent years in Kentucky. Crash patterns were summarized with recommendations made for countermeasures to reduce the probability of crashes, specifically at intersections, with an emphasis on the early stages of operation. The literature was reviewed, crash data were obtained at nine case study bypasses, and discussions were held …

Synthesis And Enzymatic Resolution Of Amino Acid Esters In "Green" Solvents -- Ionic Liquids, Hua Zhao

Dissertations

Chiral separation has attracted tremendous attention in pharmaceutical and chemical fields, especially in the area of chiral drug development. Chiral amino acids are among the most important intermediates in the asymmetric synthesis of modem drugs. This research has developed an effective method for obtaining optically pure amino acids by enzymatic resolution using a "green" solvent, named an ionic liquid.

Ionic liquids, a new type of "green" solvents, have been used in many organic reactions and other chemical processes (such as liquid-liquid extraction) with improved performance. This is mainly due to their favorable properties for chemical applications, such as low vapor …

Remediation Of Chromium Contaminated Soils With Colloidal Silica, Netnapid Yossapol

Dissertations

The low-viscosity stabilizer, colloidal silica, is extensively used as a grouting material in the construction of grout curtains. It has low viscosity and is non-toxic, which is suitable for injection to stabilize fine-grained soils. It is also applied as a stabilizer in the in-situ treatment of hazardous waste. Once the colloidal silica solution is injected into contaminated soil, it moves through the pores inside the soil matrix, initiating the stabilization process. The viscosity of the colloidal silica mixture increases while it moves until solidifications. This process is called gelation and results in the creation of a gel barrier around contaminated …

Atomic Force Microscopy Used To Determine The Young's Modulus Of Vascular Smooth Muscle Cells, Samuel C. Lieber

Theses

The Young's modulus of cultured mouse and rat vascular smooth muscle cells (VSMC) was measured with an atomic force microscope (AFM). The AFM can image the three-dimensional structure of biological cells in a physiological environment enabling real-time biochemical and physiological processes to be monitored at a resolution similar to that obtained for the electron microscope (EM). Cellular mechanical properties were determined by indenting the cell's body, and analyzing the indentation data with classical infinitesimal strain theory. This calculation was accomplished by modeling the AFM probe as a cone. as well as a blunted cone. The blunted cone geometry fits the …

On The Selection Of Simulation Software For Manufacturing Application, Amr Arisha, Mohie El Baradie

Conference papers

The growing complexity of manufacturing along with the need for higher efficiency, greater flexibility, better product quality and lower cost urged the use of simulation in manufacturing systems. The number and variety of simulation software packages on the market increased as well. Consequently, the varieties of these packages led to some bewilderment on the part of potential users when faced the selection process. The present article addresses an overview of material addressed in journals, conferences, and textbooks on the selection of appropriate simulation software. It also suggests a classification of main criteria to be considered in evaluating simulation software packages. …

Ua3/9/5 Complex For Engineering & Biological Sciences Groundbreaking, Wku President's Office

WKU Administration Documents

Remarks delivered by WKU president Gary Ransdell at the groundbreaking of the Complex for Engineering & Biological Sciences.

Design And Analysis For Melt Casting Metallic Fuel Pins Incorporating Volatile Actinides: Quarterly Progress Report 5/16/02- 8/15/02, Yitung Chen, Randy Clarksean, Darrell Pepper

Fuels Campaign (TRP)

An important aspect of the Advanced Accelerator Applications (AAA) program is the development of a casting process by which volatile actinide element (i.e., americium) can be incorporated into metallic alloy fuel pins. The traditional metal fuel casting process uses an inductively heated crucible.

This process works well for the fabrication of metal fuel pins traditionally composed of alloys of uranium and plutonium, but does not work well when highly volatile actinides are included in the melt. The problem occurs both during the extended time period required to superheat the alloy melt as well as when the chamber must be evacuated. …

Effective Strategies To Assess The Impact Of E-Learning, Barbara M. Olds

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

An Integrated Learning And Information Environment For Product Innov@Tion, Wilfried J. Elspass

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Synchronous Internet Distance Education: Wave Of The Future Or Wishful Thinking?, J. Mark Pullen

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Technology, Learning And Scholarship In The Early 21st Century, Randy J. Hinrichs

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Transitioning To E-Learning: A Case Study, Carolyn M. Stark, Kathy J. Schmidt

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

The Future Of Learning Objects, H. Wayne Hodgins

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Mentornet: Large Scale E-Mentoring For Women In Science, Engineering, And Technology (Set) Fields, Carol B. Muller

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Introduction: Foreword; The Potential And Pitfalls Of E-Technologies; A "Roadmap" To Recommendations, Michael L. Corradini, Jack R. Lohmann

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Problem-Based Learning In A Multi-Electronic Media Classroom, Kuyen Li, David L. Cocke, John L. Gossage

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

The Intersection Of Learning Architecture And Instructional Design In E-Learning, Diana L. Wilkinson

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

International Exposure For Engineering Students Using Distance Learning Techniques, Russel C. Jones, Bethany S. Oberst, Thomas J. Siller, Gearold R. Johnson

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Development And Use Of Simulation Modules For Teaching A Distance-Learning Course On Digital Processing Of Speech Signals, John N. Gowdy, Eric K. Patterson, Duanpei Wu, Sami Niska

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Strategic Assessment At The Massachusetts Institute Of Technology, Lori Breslow

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

E-Technologies For Improving Engineering Education At A Distance, Thomas J. Siller, Gearold R. Johnson

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

E-Technologies In Engineering Education: A Case Of Pedagogy Development, Svetlana Kudrjavtseva

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Infrastructure For Embracing E-Technology In An Academic Department, Rafael G. Quimpo

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Measuring The Performance Of Online Distributed Team Innovation (Learning) Services, Larry Leifer, Jack Culpepper, Wendy Ju, David Cannon, Ozgur Eirs, Tao Ling, David Bell, Eric Bier, Ken Pier

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

Improving Engineering Student Learning In A Web-Based Learning Space Due To Virtual Reality Techniques And Advanced Interactivity, Fanny Klett

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.

In-Depth Learning Through Conceptual Navigation In Virtual And Hyper Space, Piet Kommers

e-Technologies in Engineering Education: Learning Outcomes Providing Future Possibilities

No abstract provided.