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Articles 631 - 660 of 874

Full-Text Articles in Materials Science and Engineering

Use Of Fly Ash As A Proppant In Fracking Unconventional Oil & Gas Wells, Tom Robl, Anne Oberlink, Robert Jewell, Tristana Duvallet May 2019

Use Of Fly Ash As A Proppant In Fracking Unconventional Oil & Gas Wells, Tom Robl, Anne Oberlink, Robert Jewell, Tristana Duvallet

World of Coal Ash Proceedings

No abstract provided.


Bulk Storage (10,000+ Tons) Of Fly Ash, Fgd Gypsum, Limestone And Coal At Power Stations In Concrete Domes, Benjamin Davis, Zachary Fillmore, Michael Hunter May 2019

Bulk Storage (10,000+ Tons) Of Fly Ash, Fgd Gypsum, Limestone And Coal At Power Stations In Concrete Domes, Benjamin Davis, Zachary Fillmore, Michael Hunter

World of Coal Ash Proceedings

No abstract provided.


Soil Mixing And Slurry Trench Cutoff Walls For Coal Combustion Residue Sites, Jeffrey C. Evans, Daniel Ruffing May 2019

Soil Mixing And Slurry Trench Cutoff Walls For Coal Combustion Residue Sites, Jeffrey C. Evans, Daniel Ruffing

World of Coal Ash Proceedings

No abstract provided.


Cost-Effective, Environmentally-Friendly Ash Beneficiation Technology, Scott Ziegler May 2019

Cost-Effective, Environmentally-Friendly Ash Beneficiation Technology, Scott Ziegler

World of Coal Ash Proceedings

No abstract provided.


The Utilization Of Dry Scrubber Material For The Production Of Calcium Sulfoaluminate Clinkers And Cements, Tristana Y. Duvallet, Robert B. Jewell, Anne E. Oberlink, Thomas L. Robl May 2019

The Utilization Of Dry Scrubber Material For The Production Of Calcium Sulfoaluminate Clinkers And Cements, Tristana Y. Duvallet, Robert B. Jewell, Anne E. Oberlink, Thomas L. Robl

World of Coal Ash Proceedings

No abstract provided.


Net Environmental Benefit Analysis (Neba) For Ccr Pond Closure Decisions -- A Pathway To Meaningful Citizen Engagement And Reducing The Potential For Unnecessary Litigation, Chris Hardin, Ric Traver May 2019

Net Environmental Benefit Analysis (Neba) For Ccr Pond Closure Decisions -- A Pathway To Meaningful Citizen Engagement And Reducing The Potential For Unnecessary Litigation, Chris Hardin, Ric Traver

World of Coal Ash Proceedings

No abstract provided.


Challenges Met In Using Bottom Ash As A Landfill Drainage Media, William M. Strachan May 2019

Challenges Met In Using Bottom Ash As A Landfill Drainage Media, William M. Strachan

World of Coal Ash Proceedings

No abstract provided.


Two Bottom Ash Management/Handling System Enhancement Case Studies – From Technology Evaluation And Design Through Construction And Performance Verification, George Mckenzie, Aaron Davis, Chris Pickelmann, Jason Obermeyer May 2019

Two Bottom Ash Management/Handling System Enhancement Case Studies – From Technology Evaluation And Design Through Construction And Performance Verification, George Mckenzie, Aaron Davis, Chris Pickelmann, Jason Obermeyer

World of Coal Ash Proceedings

No abstract provided.


Slurry-Trench Cutoff Walls For The Containment Of The Coal Combustion Residuals (Ccr) Impacted Groundwater: Evaluation Of Hydraulic Conductivity And Consolidation Properties Of Soil-Bentonite Backfills, Y.L. Yang, Krishna Reddy, Y.J. Du, R.D. Fan May 2019

Slurry-Trench Cutoff Walls For The Containment Of The Coal Combustion Residuals (Ccr) Impacted Groundwater: Evaluation Of Hydraulic Conductivity And Consolidation Properties Of Soil-Bentonite Backfills, Y.L. Yang, Krishna Reddy, Y.J. Du, R.D. Fan

World of Coal Ash Proceedings

No abstract provided.


Ccp Beneficial Use Risk Assessment: Case Studies For Three Different Applications, Andrew Bittner, Ari Lewis May 2019

Ccp Beneficial Use Risk Assessment: Case Studies For Three Different Applications, Andrew Bittner, Ari Lewis

World of Coal Ash Proceedings

No abstract provided.


Corrective Measures/Corrective Action (Cm/Ca) Strategies That Effectively Integrate Engineered Pond Closures And Short/Long-Term Groundwater Management With Case Study Examples, Steve Putrich May 2019

Corrective Measures/Corrective Action (Cm/Ca) Strategies That Effectively Integrate Engineered Pond Closures And Short/Long-Term Groundwater Management With Case Study Examples, Steve Putrich

World of Coal Ash Proceedings

No abstract provided.


Managing Landfill Leachate In A World Without Ash Basins: Lessons Learned And Practical Considerations, Evan Andrews, Michael Lazar May 2019

Managing Landfill Leachate In A World Without Ash Basins: Lessons Learned And Practical Considerations, Evan Andrews, Michael Lazar

World of Coal Ash Proceedings

No abstract provided.


Developing Enhanced Monitored Natural Attenuation Strategies Using Reactive Transport Models, Pj Nolan, Hugh Davies, Greg Hebeler, Rens Verburg May 2019

Developing Enhanced Monitored Natural Attenuation Strategies Using Reactive Transport Models, Pj Nolan, Hugh Davies, Greg Hebeler, Rens Verburg

World of Coal Ash Proceedings

No abstract provided.


Enhancing Coal Ash Impoundment Closure Using Value Engineering, Holt Wheeler, Trey Mangers, Paul Lear May 2019

Enhancing Coal Ash Impoundment Closure Using Value Engineering, Holt Wheeler, Trey Mangers, Paul Lear

World of Coal Ash Proceedings

No abstract provided.


Experimental Test Method To Determine The Reactivity Of Fly Ash For Use In Concrete Mixture Proportioning, Antara Choudry, Deborah Glosser, O. Burkan Isgor, W. Jason Weiss May 2019

Experimental Test Method To Determine The Reactivity Of Fly Ash For Use In Concrete Mixture Proportioning, Antara Choudry, Deborah Glosser, O. Burkan Isgor, W. Jason Weiss

World of Coal Ash Proceedings

No abstract provided.


Overview Of Epri Research On Environmental Issues And Beneficial Use Of Coal Combustion Products, Bruce Hensel, Ken Ladwig May 2019

Overview Of Epri Research On Environmental Issues And Beneficial Use Of Coal Combustion Products, Bruce Hensel, Ken Ladwig

World of Coal Ash Proceedings

No abstract provided.


Is My Site A Candidate For A Groundwater Natural Attenuation Remedy? A Geochemist’S Perspective, Bob Glazier May 2019

Is My Site A Candidate For A Groundwater Natural Attenuation Remedy? A Geochemist’S Perspective, Bob Glazier

World of Coal Ash Proceedings

No abstract provided.


Impoundment Closure Enhancement Measures To Support Groundwater Compliance, John Hesemann, Wayne Weber, Eric Dulle May 2019

Impoundment Closure Enhancement Measures To Support Groundwater Compliance, John Hesemann, Wayne Weber, Eric Dulle

World of Coal Ash Proceedings

No abstract provided.


Panel On Liquefaction Of Ponded Fly Ash: From Laboratory To Practice, Tarunjit S. Butalia May 2019

Panel On Liquefaction Of Ponded Fly Ash: From Laboratory To Practice, Tarunjit S. Butalia

World of Coal Ash Proceedings

No abstract provided.


Method Of Increasing Mass Transfer Rate Of Acid Gas Scrubbing Solvents, Joseph E. Remias, Cameron A. Lippert, Kunlei Liu Feb 2019

Method Of Increasing Mass Transfer Rate Of Acid Gas Scrubbing Solvents, Joseph E. Remias, Cameron A. Lippert, Kunlei Liu

Center for Applied Energy Research Faculty Patents

A method of increasing the overall mass transfer rate of acid gas scrubbing solids is disclosed. Various catalyst compounds for that purpose are also disclosed.


Process Sustainability Evaluation For Manufacturing Of A Component With The 6r Application, Ana E. Bonilla Hernández, Tao Lu, Tomas Beno, Claes Fredriksson, Ibrahim S. Jawahir Jan 2019

Process Sustainability Evaluation For Manufacturing Of A Component With The 6r Application, Ana E. Bonilla Hernández, Tao Lu, Tomas Beno, Claes Fredriksson, Ibrahim S. Jawahir

Institute for Sustainable Manufacturing Faculty Publications

Sustainability in manufacturing can be evaluated at product, process and system levels. The 6R methodology for sustainability enhancement in manufacturing processes includes: reduced use of materials, energy, water and other resources; reusing of products/components; recovery and recycling of materials/components; remanufacturing of products; and redesigning of products to utilize recovered materials/resources. Although manufacturing processes can be evaluated by their productivity, quality and cost, process sustainability assessment makes it a complete evaluation. This paper presents a 6R-based evaluation method for sustainable manufacturing in terms of specific metrics within six major metrics clusters: environmental impact, energy consumption, waste management, cost, resource utilization and …


A Total Life Cycle Approach For Developing Predictive Design Methodologies To Optimize Product Performance, Buddhika M. Hapuwatte, Ibrahim S. Jawahir Jan 2019

A Total Life Cycle Approach For Developing Predictive Design Methodologies To Optimize Product Performance, Buddhika M. Hapuwatte, Ibrahim S. Jawahir

Institute for Sustainable Manufacturing Faculty Publications

Sustainable products must be designed by considering how design decisions impact their total life cycle (TLC) sustainability content. Even more so important when designing products to incorporate the technological elements of sustainable manufacturing, the 6Rs (Reduce, Reuse, Recycle, Recover, Redesign and Remanufacture), to achieve Circular Economy (CE). This paper presents the preliminary work of an ongoing research project on developing a novel framework incorporating predictive models with TLC considerations. This unique approach develops and integrates models with associated risks, and optimizes for maximizing the sustainability benefits due to design decisions. Such predictive capability is extremely useful for process planning, where …


Sustainable Production Through Balancing Trade-Offs Among Three Metrics In Flow Shop Scheduling, Amin Abedini, Wei Li, Fazleena Badurdeen, Ibrahim S. Jawahir Jan 2019

Sustainable Production Through Balancing Trade-Offs Among Three Metrics In Flow Shop Scheduling, Amin Abedini, Wei Li, Fazleena Badurdeen, Ibrahim S. Jawahir

Institute for Sustainable Manufacturing Faculty Publications

In sustainable manufacturing, inconsistencies exist among objectives defined in triple-bottom-lines (TBL) of economy, society, and environment. Analogously, inconsistencies exist in flow shop scheduling among three objectives of minimizing total completion time (TCT), maximum completion time (MCT), and completion time variance (CTV), respectively. For continuous functions, the probability is zero to achieve the objectives at their optimal values, so is it at their worst values. Therefore, with inconsistencies among individual objectives of discrete functions, it is more meaningful and feasible to seek a solution with high probabilities that system performance varies within the …


Designing And Redesigning Products, Processes, And Systems For A Helical Economy, Ryan Bradley, Ibrahim S. Jawahir Jan 2019

Designing And Redesigning Products, Processes, And Systems For A Helical Economy, Ryan Bradley, Ibrahim S. Jawahir

Institute for Sustainable Manufacturing Faculty Publications

The Circular Economy (CE) concept has promised to unlock trillions of dollars in business value while driving a significant reduction in the world’s resource consumption and anthropogenic emissions. However, CE mainly lives in ambiguity in the manufacturing domain because CE does not address the changes needed across all of the fundamental elements of manufacturing: products, processes, and systems. Conceptually, CE is grounded in the concept of closed-loop material flows that fit within ecological limits. This grounding translates into a steady state economy, a result that is not an option for the significant portion of the world living in poverty. Therefore, …


Cadmium Sulfide-Buffered Pv Systems: Assessing The Environmental, Health, And Economic Impacts, Maqsood Ali Mughal, Rajesh Sharma Jan 2019

Cadmium Sulfide-Buffered Pv Systems: Assessing The Environmental, Health, And Economic Impacts, Maqsood Ali Mughal, Rajesh Sharma

Journal of the Arkansas Academy of Science

As the world’s population continues to grow, global energy crises are expected to rise in the future, thus accelerating the demand for renewable energy technology, particularly solar photovoltaics. The energy sector will face an increasingly complex array of interlocking challenges - technological, environmental, health, economic, and regulatory. In this paper, we study CdS, a widely used buffer material in thin film photovoltaics, to assess and monetize environmental, health, and socio-economic externalities associated with the use of the material. Currently, CdS has a significant advantage over other alternate buffer materials in terms of efficiency and low-cost production of large-area processing of …


Fundamental Insights On The Electrolysis Of Co2 Using Solid Oxide Electrolysis Cells, Juliana Silva Alves Carneiro Jan 2019

Fundamental Insights On The Electrolysis Of Co2 Using Solid Oxide Electrolysis Cells, Juliana Silva Alves Carneiro

Wayne State University Dissertations

The work reported in this thesis focused on providing a fundamental understanding, at the molecular level, required to guide the effective design of electrocatalysts towards a superior reaction kinetics on the electrode of solid oxide electrolysis cells SOECs devices (SOECs) during the CO2 electrolysis. High temperature SOECs are electrochemical energy conversion technologies, that have emerged as promising alternatives to mitigate environmental issues associated with combustion-based technologies, such as the rising atmospheric CO2 levels. The conversion of excess CO2 into high-energy molecules, such as CO can be efficiently achieved through the use of SOEC – which facilitates the electrochemical reduction of …


Towards Sustainable Production Of Chemicals And Fuels From The Fast Pyrolysis Of Waste Polyolefin Plastics, Ulises Gracida Alvarez Jan 2019

Towards Sustainable Production Of Chemicals And Fuels From The Fast Pyrolysis Of Waste Polyolefin Plastics, Ulises Gracida Alvarez

Dissertations, Master's Theses and Master's Reports

The increasing amount of plastic waste (PW) generation has become an important concern due to the leveled-off recycling rates. Therefore, governmental agencies around the world, including state governments in the United States, have proposed initiatives to minimize the amount of PW that is landfilled and encourage recycling or energy recovery. Circular economy is a strategy that attempts on reusing PW to produce new polymers while avoiding its disposal and the use of virgin material. Chemical recycling raises an interesting technology prospect due to the potential reduction of pollutant emissions and the establishment of a circular economy through the production of …


Photocatalytic Activity: Experimental Features To Report In Heterogeneous Photocatalysis, Md. Ariful Hoque, Marcelo I. Guzman Oct 2018

Photocatalytic Activity: Experimental Features To Report In Heterogeneous Photocatalysis, Md. Ariful Hoque, Marcelo I. Guzman

Chemistry Faculty Publications

Heterogeneous photocatalysis is a prominent area of research with major applications in solar energy conversion, air pollution mitigation, and removal of contaminants from water. A large number of scientific papers related to the photocatalysis field and its environmental applications are published in different journals specializing in materials and nanomaterials. However, many problems exist in the conception of papers by authors unfamiliar with standard characterization methods of photocatalysts as well as with the procedures needed to determine photocatalytic activities based on the determination of “apparent quantum efficiencies” within a wavelength interval or “apparent quantum yields” in the case of using monochromatic …


Ultrafine Mineral Associations In Superhigh-Organic-Sulfur Kentucky Coals, James C. Hower, Debora Berti, Michael F. Hochella Jr. Sep 2018

Ultrafine Mineral Associations In Superhigh-Organic-Sulfur Kentucky Coals, James C. Hower, Debora Berti, Michael F. Hochella Jr.

Center for Applied Energy Research Faculty and Staff Publications

Two high-organic-sulfur Kentucky coals, the eastern Kentucky River Gem coal and the western Kentucky Davis coal, are examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), both including elemental analysis by energy-dispersive spectroscopy (EDS). From the SEM–EDS analysis, it is observed that the western Kentucky coal had areas with Pb and Cd in addition to the expected Fe and S and the eastern Kentucky coal had individual Fe–S-rich areas with La and Ni and with Si, Al, Cr, Ni, and Ti. TEM and selected area electron diffraction (SAED) analyses demonstrate that anglesite with a rim of Pb-bearing amorphous …


The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence, Shamara P. Collins Jul 2018

The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence, Shamara P. Collins

USF Tampa Graduate Theses and Dissertations

The photovoltaic properties of CdTe-based thin films depend on recombination levels formed in the CdTe layer and at the heterojunction. The localized states are resultant of structural defects (metal sublattice, chalcogen sublattice, interstitial), controlled doping, deposition process, and/or post-deposition annealing. The photoluminescence study of CdTe thin films, from both the bulk and heterojunction, can reveal radiative states due to different defects or impurities. Identification of defects allows for potential explanation of their roles and influence on solar cell performance. A thorough understanding of the material properties responsible for solar cell performance is critical in further advancing the efficiency of devices. …