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Articles 331 - 360 of 691

Full-Text Articles in Biochemical and Biomolecular Engineering

Experimental Composite Guidance Conduits For Peripheral Nerve Repair: An Evaluation Of Ion Release, X. F. Zhang, A. Coughlan, H. O'Shea, Mark R. Towler, S. Kehoe, D. Boyd Aug 2012

Experimental Composite Guidance Conduits For Peripheral Nerve Repair: An Evaluation Of Ion Release, X. F. Zhang, A. Coughlan, H. O'Shea, Mark R. Towler, S. Kehoe, D. Boyd

Chemical and Biochemical Engineering Faculty Research & Creative Works

Poly (lactide-co-glycolide) (PLGA) - Pluronic F127 - glass composites have demonstrated excellent potential, from the perspective of controlled mechanical properties and cytocompatibility, for peripheral nerve regeneration. In addition to controlling the mechanical properties and cytotoxicity for such composite devices, the glass component may mediate specific responses upon implantation via degradation in the physiological environment and release of constituent elements. However, research focused on quantifying the release levels of such therapeutic ions from these experimental medical devices has been limited. To redress the balance, this paper explores the ion release profiles for Si4+, Ca2+, Na+, …

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Processes For The Production Of Buprenorphine With Reduced Impurity Formation, Brenda E. Allen, Esa T. Jarvi, Dennis J. Kaluta, James R. Meyer, Keith Tomazi, Anthony Mannino, Brian Orr Jul 2012

Processes For The Production Of Buprenorphine With Reduced Impurity Formation, Brenda E. Allen, Esa T. Jarvi, Dennis J. Kaluta, James R. Meyer, Keith Tomazi, Anthony Mannino, Brian Orr

Chemical and Biochemical Engineering Faculty Research & Creative Works

The present invention provides process for the production of opiate alkaloids. In particular, the present invention provides processes for the production of buprenorphine or a derivative of buprenorphine that minimizes the formation of impurities.

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An Oxidase-Based Electrochemical Fluidic Sensor With High-Sensitivity And Low-Interference By On-Chip Oxygen Manipulation, Nitin Radhakrishnan, Jongwon Park, Chang Soo Kim Jul 2012

An Oxidase-Based Electrochemical Fluidic Sensor With High-Sensitivity And Low-Interference By On-Chip Oxygen Manipulation, Nitin Radhakrishnan, Jongwon Park, Chang Soo Kim

Electrical and Computer Engineering Faculty Research & Creative Works

Utilizing a simple fluidic structure, we demonstrate the improved performance of oxidase-Based enzymatic biosensors. Electrolysis of water is utilized to generate bubbles to manipulate the oxygen microenvironment close to the biosensor in a fluidic channel. for the proper enzyme reactions to occur, a simple mechanical procedure of manipulating bubbles was developed to maximize the oxygen level while minimizing the pH change after electrolysis. the sensors show improved sensitivities based on the oxygen dependency of enzyme reaction. in addition, this oxygen-rich operation minimizes the ratio of electrochemical interference signal by ascorbic acid during sensor operation (i.e., amperometric detection of hydrogen peroxide). …

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The Structural Characterization Of Ga 2o 3-Na 2o-Cao-Zno-Sio 2 Bioactive Glasses, T. J. Keenan, A. W. Wren, A. Coughlan, M. M. Hall, Mark R. Towler Jun 2012

The Structural Characterization Of Ga 2o 3-Na 2o-Cao-Zno-Sio 2 Bioactive Glasses, T. J. Keenan, A. W. Wren, A. Coughlan, M. M. Hall, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

The characterization of bioactive glasses in which zinc (Zn) has been incrementally replaced by gallium (Ga). © 2012 IEEE.

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Increasing The Quantity Of Silver In Zinc-Based Glass Polyalkenoate Cement: Is There An Improvement In Antibacterial Efficacy?, A. Coughlan, S. M. Breed, C. Ashraf, J. A. Cardinale, M. M. Hall, Mark R. Towler Jun 2012

Increasing The Quantity Of Silver In Zinc-Based Glass Polyalkenoate Cement: Is There An Improvement In Antibacterial Efficacy?, A. Coughlan, S. M. Breed, C. Ashraf, J. A. Cardinale, M. M. Hall, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Bone cements should have the ability to chemically bond to both bone and surgical metals, exhibit no chemical or thermal necrosis, and have no significant shrinkage or exotherm upon setting. Taking these properties into consideration, glass polyalkenoate cements (GPCs) have potential as bone cements. GPCs are formed by the reaction between an ion-leachable glass and an aqueous solution of polyacrylic acid (PAA) [1] and have proven antibacterial and cariostatic properties [2], which are related to their ability to release beneficial amounts of ions over time [3, 4]. The GPCs can be formulated to release ions that can have a therapeutic …

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Silver Coated Bioactive Glass Particles For Wound Healing Applications, P. Hassanzadeh, A. W. Wren, Mark R. Towler Jun 2012

Silver Coated Bioactive Glass Particles For Wound Healing Applications, P. Hassanzadeh, A. W. Wren, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Hench and colleagues discovered that bone could bond chemically to certain glass compositions in 1969 [1]. This group of glasses is known as bioactive glasses [1]. Some special compositions of bioactive glasses will bond to soft tissues as well as bone [1]. One of the important characteristics of bioactive glasses is their ability to release beneficial ions such as Ca2+, Na+, Zn2+, Sr2+, and PO 43- in the body, which promote self-healing [2]. Bioactive glasses generally contain much less glass former (e.g., SiO2, B2O3 etc.) than conventional …

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Gallium Containing Glass Polyalkenoate Bone Cements: Glass Characterization And Physical Properties, L. Placek, A. W. Wren, A. Coughlan, Mark R. Towler Jun 2012

Gallium Containing Glass Polyalkenoate Bone Cements: Glass Characterization And Physical Properties, L. Placek, A. W. Wren, A. Coughlan, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Gallium (Ga) glasses were developed to formulate a Glass Polyalkenoate Cement (GPC) series with both E9 and E11 polyacrylic acid (PAA) at 50, 55 and 60wt% additions. Working times (T w), setting times (T s), compression (σ c), and biaxial flexural (σ f) strength testing were evaluated to determine the GPCs potential use in orthopedics. © 2012 IEEE.

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Scalable Synthesis Of Palladium Nanoparticle Catalysts By Atomic Layer Deposition, Xinhua Liang, Lauren B. Lyon, Ying Bing Jiang, Alan W. Weimer Jun 2012

Scalable Synthesis Of Palladium Nanoparticle Catalysts By Atomic Layer Deposition, Xinhua Liang, Lauren B. Lyon, Ying Bing Jiang, Alan W. Weimer

Chemical and Biochemical Engineering Faculty Research & Creative Works

Atomic layer deposition (ALD) was used to produce Pd/Al2O 3 catalysts using sequential exposures of Pd (II) hexafluoro acetylacetonate and formalin at 200 °C in a fluidized bed reactor. the ALD-prepared Pd/alumina catalysts were characterized by various methods including hydrogen chemisorption, XPS, and TEM, and compared with a commercially available 1 wt.% Pd/alumina catalyst, which was also characterized. the content of Pd on alumina support and the size of Pd nanoparticles can be controlled by the number of ALD-coating cycles and the dose time of the Pd precursor. One layer of organic component from the Pd precursor remained on the …

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Silver Coated Bioactive Glass Particles For Wound Healing Applications, A. W. Wren, A. Coughlan, P. Hassanzadeh, Mark R. Towler May 2012

Silver Coated Bioactive Glass Particles For Wound Healing Applications, A. W. Wren, A. Coughlan, P. Hassanzadeh, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Bioactive glass particles (0.42SiO2-0.15CaO-0.23Na 2O-0.20ZnO) of varying size (<90 >μm and 425-850 μm) were synthesized and coated with silver (Ag) to produce Ag coated particles (PAg). These were compared against the uncoated analogous particles (Pcon.). Surface area analysis determined that Ag coating of the glass particles resulted in increased the surface area from 2.90 to 9.12 m2/g (90 μm) and 1.09-7.71 m2/g (425-850 μm). Scanning electron microscopy determined that the Ag coating remained at the surface and there was little diffusion through the bulk. Antibacterial (Escherichia coli - 13 mm and Staphylococcus epidermidis …

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On The Measurement Of Gas Holdup Distribution Near The Region Of Impeller In A Gas-Liquid Stirred Rushton Tank By Means Of Γ-Ct, Li Na Kong, Wei Li, Lu Chang Han, Yue Jin Liu, He An Luo, Muthanna H. Al Dahhan, Milorad P. Dudukovic Apr 2012

On The Measurement Of Gas Holdup Distribution Near The Region Of Impeller In A Gas-Liquid Stirred Rushton Tank By Means Of Γ-Ct, Li Na Kong, Wei Li, Lu Chang Han, Yue Jin Liu, He An Luo, Muthanna H. Al Dahhan, Milorad P. Dudukovic

Chemical and Biochemical Engineering Faculty Research & Creative Works

Three Flow Patterns of Flooding, Loading and Complete Recirculation in a Gas-Liquid Stirred Rushton Tank Were Identified based on Experimental Observation. the Gas-Liquid System Was Composed of Air and Water. under Different Operating Conditions of Gas Flow Rate and Impeller Rotating Speed, the Distribution of Gas Holdup Near the Region of Impeller Was Measured using a Γ-CT Scan Method. Both Quantitative Digital Distribution Curves of Gas Holdup and their Qualitative Color CT Images Were Obtained. at the Region of Impeller, There Was a Convex Characteristic Peak of Gas Holdup Distribution Both in Radial and in Axial Directions, and with the …

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Systems And Devices For Isothermal Biochemical Reactions And / Or Analysis, Robert W. Doebler Ii, Christopher Cooney, Anna Hickerson, James D. Sterling, Ali Nadim Apr 2012

Systems And Devices For Isothermal Biochemical Reactions And / Or Analysis, Robert W. Doebler Ii, Christopher Cooney, Anna Hickerson, James D. Sterling, Ali Nadim

Business and Information Technology Faculty Research & Creative Works

An isothermal reaction and analysis system may include a receiver to receive sample holders, a thermal control sub system to control a temperature of the receiver, an excitation Subsystem, a detection Subsystem and an analysis Subsystem. Excitation Sources and/or detectors are positioned to enhance data collection. Sample holders may include filters, selectively blocking and passing wavelengths or bands of electromagnetic radiation.

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Airlift Column Photobioreactors For Porphyridium Sp. Culturing: Part I. Effects Of Hydrodynamics And Reactor Geometry, Hu Ping Luo, Muthanna H. Al-Dahhan Apr 2012

Airlift Column Photobioreactors For Porphyridium Sp. Culturing: Part I. Effects Of Hydrodynamics And Reactor Geometry, Hu Ping Luo, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

Photosynthetic Microorganisms Have Been Attracting World Attention for their Great Potential as Renewable Energy Sources in Recent Years. Cost Effective Production in Large Scale, However, remains a Major Challenge to overcome. It is Known to the Field that Turbulence Could Help Improving the Performance of Photobioreactors Due to the So-Called Flashing Light Effects. Better Understanding of the Multiphase Fluid Dynamics and the Irradiance Distribution Inside the Reactor that Cause the Flashing Light Effects, as Well as Quantifying their Impacts on the Reactor Performance, Thus, Are Crucial for Successful Design and Scale-Up of Photobioreactors. in This Study, a Species of Red …

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Impact Of Internals On The Heat-Transfer Coefficient In A Bubble Column, Rahman S. Abdulmohsin, Muthanna H. Al-Dahhan Feb 2012

Impact Of Internals On The Heat-Transfer Coefficient In A Bubble Column, Rahman S. Abdulmohsin, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Effect of Heat Exchanging Internals on the Heat-Transfer Coefficient Has Been Investigated in a 0.19 M Diameter Bubble Column. an Air-Water System Was Used with Superficial Gas Velocities Varying from 3 to 20 Cm/s, Which Cover Both the Bubbly and Churn-Turbulent Flow Regimes. Internals Occluding 0% (Empty Column), 5% (Simulating Methanol Synthesis), and 22% (Simulating Fischer-Tropsch Synthesis) of the Column Cross-Sectional Area Were Implemented. a Fast Response Heat-Transfer Probe Was Utilized to Measure the Radial Profile of the Heat-Transfer Coefficient in the Fully Developed Flow Region. the Results Indicate that the Presence of a High Percentage of Internals Causes …

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Influence Of Solid-Phase Wall Boundary Condition On Cfd Simulation Of Spouted Beds, Xingying Lan, Chunming Xu, Jinsen Gao, Muthanna H. Al-Dahhan Feb 2012

Influence Of Solid-Phase Wall Boundary Condition On Cfd Simulation Of Spouted Beds, Xingying Lan, Chunming Xu, Jinsen Gao, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Influence of Solid-Phase Wall Boundary Condition in Terms of Specularity Coefficient and Particle-Wall Restitution Coefficient on the Flow Behavior of Spouted Beds Was Investigated using Two-Fluid Model Approach in the Computational Fluid Dynamics Software FLUENT 6.3. Parametric Studies of Specularity Coefficient and Particle-Wall Restitution Coefficient Were Performed to Evaluate their Effects on the Flow Hydrodynamics in Terms of Fountain Height, Spout Diameter, Pressure Drop, Local Voidage and Particles Velocity. the Numerical Predictions Were Compared with Available Experimental Data in the Literatures to Obtain the Suitable Values of Specularity Coefficient and Particle-Wall Restitution Coefficient for Spouted Beds. the Simulated Results …

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Heat Transfer Coefficients In Mimicked Fischer-Tropsch Slurry Bubble Columns, Chengtian Wu, Muthanna H. Al-Dahhan Feb 2012

Heat Transfer Coefficients In Mimicked Fischer-Tropsch Slurry Bubble Columns, Chengtian Wu, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

To Provide More Support for Fischer-Tropsch (FT) Slurry Bubble Column Reactor Design, Scale-Up, and Performance, the Effects of Operating Conditions on the Heat Transfer Coefficients Were Investigated in a Mimicked FT Cold Flow System (Compressed Air:C 9-C 11:FT Catalyst Carrier). the Studied Operating Conditions Varied in Superficial Gas Velocity (Up to 0.3 M/s), Pressure (Up to 10 Bar), and Solids Concentration (Up to 25 Vol %). the Effects of These Variables on Heat Transfer Coefficients Are Discussed and Analyzed. the Increase in Pressure Tended to Reduce the Heat Transfer Coefficient, While the Increase in Solids Loading Enhanced the Heat Transfer …

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Airlift Column Photobioreactors For Porphyridium Sp. Culturing: Part Ii. Verification Of Dynamic Growth Rate Model For Reactor Performance Evaluation, Hu Ping Luo, Muthanna H. Al-Dahhan Jan 2012

Airlift Column Photobioreactors For Porphyridium Sp. Culturing: Part Ii. Verification Of Dynamic Growth Rate Model For Reactor Performance Evaluation, Hu Ping Luo, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

Dynamic Growth Rate Model Has Been Developed to Quantify the Impact of Hydrodynamics on the Growth of Photosynthetic Microorganisms and to Predict the Photobioreactor Performance. Rigorous Verification of Such Reactor Models, However, is Rare in the Literature. in This Part of Work, Verification of a Dynamic Growth Rate Model Developed in Luo and Al-Dahhan (2004) [Biotech Bioeng 85(4): 382-393.] Was Attempted using the Experimental Results Reported in Part I of This Work and Results from Literature. the Irradiance Distribution Inside the Studied Reactor Was Also Measured at Different Optical Densities and Successfully Correlated by the Lambert-Beer Law. When Reliable Hydrodynamic …

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Optofluidic Glucose Sensor Utilizing An Epoxy-Based, Transparent Dry Film Resist, Zhan Gao, Sijia Gong, Chang Soo Kim, David B. Henthorn Dec 2011

Optofluidic Glucose Sensor Utilizing An Epoxy-Based, Transparent Dry Film Resist, Zhan Gao, Sijia Gong, Chang Soo Kim, David B. Henthorn

Electrical and Computer Engineering Faculty Research & Creative Works

An enzymatic, fluorescent glucose sensor was constructed with a novel epoxy-Based, optically transparent dry film resist (PerMX 3000 series, DuPont). This material was utilized as the main active material for fluidic structure and optical interrogation. This sensor was based on the enzymatic reaction of glucose oxidase (GOD) and utilized a ruthenium complex fluorophore as the reporting agent. Both the oxygen-sensitive ruthenium complex and GOD were incorporated into poly (ethylene glycol) (PEG)-Based hydrogel materials, which were lithographically patterned and embedded inside the PerMX fluidic channel after wafer-bonding process. the optofluidic sensing platform with this embedded sensing elements exhibited a wide dynamic …

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Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler Nov 2011

Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

This paper reports on improvement of the physical and mechanical properties of Y2O3-ZrO2 ceramics through compositional optimization, the use of nanograined powders and utilization of microwave sintering. ZrO2 with 2-5 mol% Y2O3, prepared from nanopowders, was sintered in both conventional and microwave furnaces under exactly the same heating schedule. It was found that microwave sintering improves physical and mechanical properties of Y2O3-ZrO2 ceramics compared with conventional sintering. Compositions containing 2 mol% Y2O3 exhibit the greatest improvement due to retention of tetragonal ZrO …

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Γ-Ct Measurement And Cfd Simulation Of Cross Section Gas Holdup Distribution In A Gas-Liquid Stirred Standard Rushton Tank, Yue Jin Liu, Wei Li, Lu Chang Han, Yang Cao, He An Luo, Muthanna H. Al-Dahhan, M. P. Dudukovic Sep 2011

Γ-Ct Measurement And Cfd Simulation Of Cross Section Gas Holdup Distribution In A Gas-Liquid Stirred Standard Rushton Tank, Yue Jin Liu, Wei Li, Lu Chang Han, Yang Cao, He An Luo, Muthanna H. Al-Dahhan, M. P. Dudukovic

Chemical and Biochemical Engineering Faculty Research & Creative Works

Cross Section Gas Holdup Distributions at 3/4 Dimensionless Static Liquid Height in a Gas-Liquid Stirred Standard Rushton Tank Were Measured using 137Cs Γ-CT Scan Measuring Technology at Larger Gas Flow Rates and Higher Impeller Rotating Speeds. the Obtained CT Scan Images and Digital Distribution Curves of Gas Holdup with Dimensionless Radius based on the CT Images Could Explain the Fluctuation Changes of Gas Holdup Distribution. the Dense Area of Gas Holdup Distribution Appeared in the Upper Space of Impeller Blades. Gas Holdup Increased Both with Gas Flow Rate and Impeller Rotating Speed, But Gas Flow Rate Had More Influence on …

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Sol-Gel Derived Silver-Incorporated Titania Thin Films On Glass: Bactericidal And Photocatalytic Activity, Betul Akkopru Akgun, Anthony W. Wren, Caner Durucan, Mark R. Towler, Nathan P. Mellott Aug 2011

Sol-Gel Derived Silver-Incorporated Titania Thin Films On Glass: Bactericidal And Photocatalytic Activity, Betul Akkopru Akgun, Anthony W. Wren, Caner Durucan, Mark R. Towler, Nathan P. Mellott

Chemical and Biochemical Engineering Faculty Research & Creative Works

Titanium dioxide (TiO2) and silver-containing TiO2 (Ag-TiO2) thin films were prepared on silica pre-coated float glass substrates by a sol-gel spin coating method. The bactericidal activity of the films was determined against Staphylococcus epidermidis under natural and ultraviolet (UV) illumination by four complementary methods; (1) the disk diffusion assay, (2) UV-induced bactericidal test, (3) qualitative Ag ion release in bacteria inoculated agar media and (4) surface topographical examination by laserscan profilometry. Photocatalytic activity of the films was measured through the degradation of stearic acid under UV, solar and visible light conditions. The chemical state and …

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Clinical Risk Factors For Osteoporosis In Ireland And The Uk: A Comparison Of Frax And Qfracturescores, N. M. Cummins, E. K. Poku, Mark R. Towler, O. M. O'Driscoll, S. H. Ralston Aug 2011

Clinical Risk Factors For Osteoporosis In Ireland And The Uk: A Comparison Of Frax And Qfracturescores, N. M. Cummins, E. K. Poku, Mark R. Towler, O. M. O'Driscoll, S. H. Ralston

Chemical and Biochemical Engineering Faculty Research & Creative Works

Recently two algorithms have become available to estimate the 10-year probability of fracture in patients suspected to have osteoporosis on the basis of clinical risk factors: the FRAX algorithm and QFractureScores algorithm (QFracture). The aim of this study was to compare the performance of these algorithms in a study of fracture patients and controls recruited from six centers in the United Kingdom and Ireland. A total of 246 postmenopausal women aged 50-85 years who had recently suffered a low-trauma fracture were enrolled and their characteristics were compared with 338 female controls who had never suffered a fracture. Femoral bone mineral …

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The Effect Of Adding Organic Polymers To Ca-Sr-Zn-Si Glass Polyalkenoate Cement, A. Coughlan, N. M. Cummins, A. W. Wren, Mark R. Towler Jun 2011

The Effect Of Adding Organic Polymers To Ca-Sr-Zn-Si Glass Polyalkenoate Cement, A. Coughlan, N. M. Cummins, A. W. Wren, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

To conclude, the addition of polymers to GPCs resulted in little change to the Tw and Ts, however the compressive strength was found to decrease slightly. ASAP tests revealed that the cements may undergo some structural changes as a result of these additions. In the future perhaps the addition of organic polymers suspended in the liquid phase as part of the cement may yield improved results in this type of study. © 2011 IEEE.

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Aluminium-Free Glass Polyalkenoate Spinal Cements, A. W. Wren, N. M. Cummins, Mark R. Towler Jun 2011

Aluminium-Free Glass Polyalkenoate Spinal Cements, A. W. Wren, N. M. Cummins, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Addition of Yitanium increased the Wt & St and the sf strength of these cements compared to the control (BT 101). © 2011 IEEE.

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Temperature Control Device With A Flexible Temperature Control Surface, Phil D. Belgrader, Christopher G. Cooney, Robert D. Doebler, Anna D. Hickerson, Bruce D. Irvine, Ali D. Nadim, James D. Sterling, Reza Miraghale Jun 2011

Temperature Control Device With A Flexible Temperature Control Surface, Phil D. Belgrader, Christopher G. Cooney, Robert D. Doebler, Anna D. Hickerson, Bruce D. Irvine, Ali D. Nadim, James D. Sterling, Reza Miraghale

Business and Information Technology Faculty Research & Creative Works

A device for controlling temperature in a reaction chamber is disclosed. The device comprises: a bladder assembly comprising a housing dimensioned to hold a reaction chamber disposed within an interior Volume of the housing; and a first temperature-control bladder disposed within the housing, the first temperature-control bladder is configured to receive a temperature-control fluid and comprises a flexible, heat conductive Surface that comes in contact with at least a portion of an exterior surface of the reaction chamber after receiving the temperature-control fluid. Also disclosed are a bladder thermal cycler, a temperature-control bladder assembly and methods for producing a thermal …

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Leaching Of Potential Hazardous Elements Of Coal Cleaning Rejects, Luis F.O. Silva, Maria Izquierdo, Xavier Querol, Robert B. Finkelman, Marcos L.S. Oliveira, Marcus Wollenschlager, Mark R. Towler, Rafael Pérez-López, Felipe Macias Apr 2011

Leaching Of Potential Hazardous Elements Of Coal Cleaning Rejects, Luis F.O. Silva, Maria Izquierdo, Xavier Querol, Robert B. Finkelman, Marcos L.S. Oliveira, Marcus Wollenschlager, Mark R. Towler, Rafael Pérez-López, Felipe Macias

Chemical and Biochemical Engineering Faculty Research & Creative Works

The geochemical characteristics of coal cleaning rejects (CCR) in Santa Catarina State, Brazil, were investigated. Around 3.5 million ton/ year of coal waste are dumped in Santa Catarina State. Coal beneficiation by froth flotation results in large amounts of CCR composed of coaly and mineral matter, the latter characterized by the occurrence of sulphide minerals and a broad array of leachable elements. The total and leachable contents of more than 60 elements were analyzed. Atmospheric exposure promotes sulphide oxidation that releases substantial sulphate loads as well as Ca2+, K+, Mg2+, Cl- and Al3+ …

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Verification And Validation Of Cfd Simulations For Local Flow Dynamics In A Draft Tube Airlift Bioreactor, Hu Ping Luo, Muthanna H. Al-Dahhan Mar 2011

Verification And Validation Of Cfd Simulations For Local Flow Dynamics In A Draft Tube Airlift Bioreactor, Hu Ping Luo, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

Airlift Reactors Have Been Recognized as One of the Promising Photobioreactors for Biomass/bio-Energy Production, Where Mixing Has Significant Impact on the Reactor Performance. in Recent Years, using CFD Simulations to Track Microorganism Cells and to Generate their Trajectories in the Reactor for Reactor Performance Evaluations Becomes More Common. However, there is a Lack of Systematic and Rigorous Verifications and Validations of the Reliability of CFD Models in Particle Tracking Against Experimental Measurements in the Open Literature, Which is Vital for the Faithful Application of CFD in Reactor Design and Scale-Ups. in This Work, We Attempt to Evaluate the Reliability of …

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The Structural Role Of Titanium In Ca-Sr-Zn-Si/Ti Glasses For Medical Applications, A. W. Wren, F. R. Laffir, A. Kidari, Mark R. Towler Feb 2011

The Structural Role Of Titanium In Ca-Sr-Zn-Si/Ti Glasses For Medical Applications, A. W. Wren, F. R. Laffir, A. Kidari, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

Glasses for medical applications are used in particulate form or as a cement component. This work was undertaken to determine structural changes in 0.48SiO2-0.36ZnO-0.12CaO-0.04SrO glass when the SiO2 is substituted with 5 mol% increments of TiO2. X-ray Diffraction (XRD) was used to determine the presence of crystallinity. This occurred after additions of 20 mol% TiO2. Differential Thermal Analysis (DTA) and Network connectivity (NC) calculations determined that by increasing the TiO2 content, the Tg and NC reduced (Tg 670 °C to 632 °C, NC 1.83 to -1.14) suggesting that TiO2 acts as …

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Flow Regime Identification In A Bubble Column Via Nuclear Gauge Densitometry And Chaos Analysis, S. Nedeltchev, A. Shaikh, Muthanna H. Al-Dahhan Feb 2011

Flow Regime Identification In A Bubble Column Via Nuclear Gauge Densitometry And Chaos Analysis, S. Nedeltchev, A. Shaikh, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Bubble Column Performance Can Change Significantly as a Result of Flow Regime Change. Since Reactor Volume Productivity, Mass and Heat Transfer as Well as Mixing Are Affected by the Prevailing Flow Regime, It is Very Important to Know How to Identify It. in This Work, Flow Regime Identification Was Performed on the Basis of the Kolmogorov Entropy (KE) Algorithm Applied to Nuclear Gauge Densitometry Data. in Addition, the Average Cycle Time Was Used for Validation of the Results. Three Transition Velocities Were Identified that Delineated the Boundaries of the Three Main Hydrodynamic Regimes. the First Two Transition Points Were …

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The Bioactivity And Ion Release Of Titanium-Containing Glass Polyalkenoate Cements For Medical Applications, A. W. Wren, N. M. Cummins, F. R. Laffir, S. P. Hudson, Mark R. Towler Jan 2011

The Bioactivity And Ion Release Of Titanium-Containing Glass Polyalkenoate Cements For Medical Applications, A. W. Wren, N. M. Cummins, F. R. Laffir, S. P. Hudson, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

The ion release profiles and bioactivity of a series of Ti containing glass polyalkenoate cements. Characterization revealed each material to be amorphous with a Tg in the region of 650-660°C. The network connectivity decreased (1.83-1.35) with the addition of TiO2 which was also evident with analysis by X-ray photoelectron spectroscopy. Ion release from cements were determined using atomic absorption spectroscopy for zinc (Zn2+), calcium (Ca2+), strontium (Sr2+), Silica (Si4+) and titanium (Ti4+). Ions such as Zn2+ (0.1-2.0 mg/l), Ca2+ (2.0-8.3 mg/l,) Sr2+ (0.1-3.9 mg/l), and Si4+ …

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The Response Of Pseudomonas Aeruginosa Biofilm To The Presence Of A Glass Polyalkenoate Cement Formulated From A Silver Containing Glass, A. Coughlan, M. P. Ryan, N. M. Cummins, Mark R. Towler Jan 2011

The Response Of Pseudomonas Aeruginosa Biofilm To The Presence Of A Glass Polyalkenoate Cement Formulated From A Silver Containing Glass, A. Coughlan, M. P. Ryan, N. M. Cummins, Mark R. Towler

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

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