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A Comparative Study Of The Oxidation Characteristics Of Two Gasoline Fuels And An N-Heptane/Iso-Octane Surrogate Mixture, Tamour Javed, Ehson F. Nasir, Et-touhami Es-sebbar, Aamir Farooq 2015 SelectedWorks

A Comparative Study Of The Oxidation Characteristics Of Two Gasoline Fuels And An N-Heptane/Iso-Octane Surrogate Mixture, Tamour Javed, Ehson F. Nasir, Et-Touhami Es-Sebbar, Aamir Farooq

Dr. Et-touhami Es-sebbar

Ignition delay times and CO, H2O, OH and CO2 time-histories were measured behind reflected shock waves for two FACE (Fuels for Advanced Combustion Engines) gasolines and one PRF (Primary Reference Fuel) blend. The FACE gasolines chosen for this work are primarily paraffinic and have the same octane rating (∼RON = 84) as the PRF blend, but contain varying amounts of iso- and n-paraffins. Species time-histories and ignition delay times were measured using laser absorption methods over a temperature range of 1350–1550 K and pressures near 2 atm. Measured species time-histories and ignition delay times of the PRF blend and the ...


Application Of Colloidal Gas Aphron Suspensions Produced From Sapindus Mukorossi For Arsenic Removal From Contaminated Soil, Soumyadeep Mukhopadhyay Dr 2015 SelectedWorks

Application Of Colloidal Gas Aphron Suspensions Produced From Sapindus Mukorossi For Arsenic Removal From Contaminated Soil, Soumyadeep Mukhopadhyay Dr

Soumyadeep Mukhopadhyay Dr

Colloidal gas aphron dispersions (CGAs) can be described as a system of microbubbles suspended homogenously in a liquid matrix. This work examines the performance of CGAs in comparison to surfactant solutions for washing low levels of arsenic from an iron rich soil. Sodium Dodecyl Sulfate (SDS) and saponin, a biodegradable surfactant, obtained from Sapindus mukorossi or soapnut fruit were used for generating CGAs and solutions for soil washing. Column washing experiments were performed in down-flow and up flow modes at a soil pH of 5 and 6 using varying concentration of SDS and soapnut solutions as well as CGAs. Soapnut ...


The Development Of A Valid And Reliable Biogeochemistry Concept Inventory, Chris Mead 2014 University of Nebraska - Lincoln

The Development Of A Valid And Reliable Biogeochemistry Concept Inventory, Chris Mead

DBER Speaker Series

Concept inventories are a commonly used tool to measure conceptual understanding. To date, concept inventories have been published for geology, chemistry, and biology, but no instrument has been designed to measure conceptual understanding at the intersection of those fields. To fill that gap, we constructed a 32‐item biogeochemistry concept inventory (BGC‐CI). Item response theory analysis, using the Rasch model, shows the BGC‐CI is a reliable and valid tool to measure the biogeochemistry knowledge of science majors. Because biogeochemistry is an interdisciplinary field, we were concerned about the unidimensionality of the instrument. However, our analysis showed the BGC ...


Photoelectrochemical Water-Splitting Ancillary Components, Robert A. Allen, Todd G. Deutsch 2014 DePauw University

Photoelectrochemical Water-Splitting Ancillary Components, Robert A. Allen, Todd G. Deutsch

Science Research Fellows Posters

No abstract provided.


Dynamical Behavior Of Probe Molecules And Dominant Role Of Cosurfactants In Reverse Micelles, Jia QI, Bridget L. Gourley 2014 DePauw University

Dynamical Behavior Of Probe Molecules And Dominant Role Of Cosurfactants In Reverse Micelles, Jia Qi, Bridget L. Gourley

Science Research Fellows Posters

Reverse micelles (RM) are nanopools of water surrounded by surfactant molecules in a non-polar solvent. Our studies investigated properties of RM probe molecules in the interfacial boundary between water and non-polar solvents. Reichardt’s dye, a probe molecule, was used to uncover properties of RM. UV/vis spectroscopy of Reichardt’s dye reveals information about polarity and the dye’s approximate residential location and also helps confirm molecular orbital energy diagram. We discovered an interesting phenomenon with Reichardt’s dye in RM. Surprisingly, the UV/vis spectrum of Reicahrdt’s dye in CTAB RM with octanol as a cosurfactant exhibits ...


Probe Location Within Interfacial Layer Of Ctab Reverse Micelle System, Jonathan Li, Bridget L. Gourley 2014 DePauw University

Probe Location Within Interfacial Layer Of Ctab Reverse Micelle System, Jonathan Li, Bridget L. Gourley

Science Research Fellows Posters

To understand the chemistry of the interfacial region of reverse micelles (RM), we studied RM system made with the cationic surfactant cetyltrimethylammonium bromide (CTAB), alkanol cosurfactants dissolved in cyclohexane with water core. Spectroscopic methods, specifically UV-Vis absorption of Coumarin 343 (C343) as a probe molecule, were used to determine basic properties of RM systems. However, the probe location was difficult to determine because the spectrum (absorbance), when dissolved in RM solution, didn’t match the spectra in any of the pure components. Our data suggests that the interfacial layer of RM cannot be thought of behaving only the characteristic of ...


Electrochemically Active Biofilm Assisted Synthesis Of Ag@Ceo2 Nanocomposites For Antimicrobial Activity, Photocatalysis And Photoelectrodes, Mohammad Mansoob Khan Dr, S. A. Ansari, J. H. Lee, M. O. Ansari, J Lee, M. H. Cho 2014 SelectedWorks

Electrochemically Active Biofilm Assisted Synthesis Of Ag@Ceo2 Nanocomposites For Antimicrobial Activity, Photocatalysis And Photoelectrodes, Mohammad Mansoob Khan Dr, S. A. Ansari, J. H. Lee, M. O. Ansari, J Lee, M. H. Cho

Dr. Mohammad Mansoob Khan

Ag@CeO2 nanocomposites were synthesized by a biogenic and green approach using electrochemically active biofilms (EABs) as a reducing tool. The as-synthesized Ag@CeO2 nanocomposites were characterized and used in antimicrobial, visible light photocatalytic and photoelectrode studies. The Ag@CeO2 nanocomposites showed effective and efficient bactericidal activities and survival test against Escherichia coli O157:H7, and Pseudomonas aeruginosa. The as-synthesized Ag@CeO2 nanocomposites also exhibited enhanced visible light photocatalytic degradation of 4-nitrophenol and methylene blue than pure CeO2. A photocatalytic investigation showed that the Ag@CeO2 nanocomposites possessed excellent visible light photocatalytic activities compared to pure CeO2. Electrochemical impedance spectroscopy ...


Ogden College News, Cheryl Stevens, Dean 2014 Western Kentucky University

Ogden College News, Cheryl Stevens, Dean

Ogden College of Science & Engineering Publications

No abstract provided.


The Atmosphere Can Be A Source Of Certain Water Soluble Volatile Organic Compounds In Urban Streams, Scott J. Kenner, David A. Bender, James F. Pankow, John S. Zogorski 2014 Portland State University

The Atmosphere Can Be A Source Of Certain Water Soluble Volatile Organic Compounds In Urban Streams, Scott J. Kenner, David A. Bender, James F. Pankow, John S. Zogorski

Chemistry Faculty Publications and Presentations

Surface water and air volatile organic compound (VOC) data from 10 U. S. Geological Survey monitoring sites were used to evaluate the potential for direct transport of VOCs from the atmosphere to urban streams. Analytical results of 87 VOC compounds were screened by evaluating the occurrence and detection levels in both water and air, and equilibrium concentrations in water (C-w(s)) based on the measured air concentrations. Four compounds (acetone, methyl tertiary butyl ether, toluene, and m- & p-xylene) were detected in more than 20% of water samples, in more than 10% of air samples, and more than 10% of detections ...


Synthesis, Characterization And Electrical Properties Of Pb(8-X)Na2ndx(Vo4)6o(X/2) Solid Solutions, Eugeni I. Get’man, Tatiana M. Savankova, Alexey V. Ignatov, K. G. Didorenko, A. Y. Talykova, Lyudmyla I. Ardanova 2014 Minnesota State University, Mankato

Synthesis, Characterization And Electrical Properties Of Pb(8-X)Na2ndx(Vo4)6o(X/2) Solid Solutions, Eugeni I. Get’Man, Tatiana M. Savankova, Alexey V. Ignatov, K. G. Didorenko, A. Y. Talykova, Lyudmyla I. Ardanova

Chemistry and Geology Faculty Publications

Substitution of neodymium for lead in the apatite structure in accordance to scheme 2Pb2+□ → 2No3+ + O2- has been investigated by X-ray powder diffraction, scanning electron microscopy, IR spectroscopy and the measurement of electrical conductivity. It was estimated that single phase solid solutions Pb(8-x)Na2Ndx(VO4)6O(x/2) are formed in the range of x - 0-0.25. The crystal structure features of some samples have been refined by the Rietveld method. It was shown that ions Nd3+ preferably occupy M(1) site. Influence of the composition x on the electrical conductivity and activation energy has been investigated.


Evaluating Contaminants Of Emerging Concern In Commercial Biosolid-Based Fertilizers, John Hemmerling, Michael L. Mashtare, Linda S. Lee 2014 Purdue University

Evaluating Contaminants Of Emerging Concern In Commercial Biosolid-Based Fertilizers, John Hemmerling, Michael L. Mashtare, Linda S. Lee

The Summer Undergraduate Research Fellowship (SURF) Symposium

The production and popularity of commercially available biosolid-based fertilizers are increasing because of their economic, environmental, and plant nutrition benefits, particularly in urban and suburban areas. Because biosolid-based fertilizers are derived from waste water treatment plant residuals, we hypothesized that there is the potential for micropollutants to persist in these products. Their presence would be of particular concern due to their potential impact on human and ecological health and risk of bioaccumulation. This study involves quantifying contaminants of emerging concern in three biosolid-based fertilizers, and 2 non-biosolid-based fertilizers, a composted animal manure and an organic compost. Our extraction method employed ...


Quantitative Mid-Infrared Spectra Of Allene And Propyne From Room To High Temperatures, Et. Es-sebbar, A. Jolly, Y. Benilan, A. Farooq 2014 SelectedWorks

Quantitative Mid-Infrared Spectra Of Allene And Propyne From Room To High Temperatures, Et. Es-Sebbar, A. Jolly, Y. Benilan, A. Farooq

Dr. Et-touhami Es-sebbar

Allene (a-C3H4; CH2CCH2) and propyne (p-C3H4; CH3C2H) have attracted much interest because of their relevance to the photochemistry in astrophysical environments as well as in combustion processes. Both allene and propyne have strong absorption in the infrared region. In the present work, infrared spectra of a-C3H4 and p-C3H4 are measured in the gas phase at temperatures ranging from 296 to 510 K. The spectra are measured over the 580–3400 cm−1 spectral region at resolutions of 0.08 and 0.25 cm−1 using Fourier Transform Infrared spectroscopy. Absolute integrated intensities of the main infrared bands are determined at ...


Using Stable Isotopes To Quantify Nitrogen Fates In Container Plants, Sam Raimann, Greg Michalski, Michael V. Mickelbart 2014 Purdue University

Using Stable Isotopes To Quantify Nitrogen Fates In Container Plants, Sam Raimann, Greg Michalski, Michael V. Mickelbart

The Summer Undergraduate Research Fellowship (SURF) Symposium

Currently, in the agriculture field, it is not yet known the accurate amount of Nitrogen in fertilizer that plants take up. This statistic, known as the Nitrogen Use Efficiency is currently known to be within the 30-50% range (Lea-Cox and Ross, 2001). This is very important figure to know and it is a figure that can be improved, and therefore much time, energy, and resources can be saved. This research project will use concepts involving stable isotopes to examine red maple plant material and the soilless media that the plants were grown in. Three different isotope-labelled fertilizer treatments will be ...


Surgical Adhesive From Mussel Mimetic Polymer, Jenna DeSousa, Cori Jenkins, Jonathan Wilker 2014 Purdue University

Surgical Adhesive From Mussel Mimetic Polymer, Jenna Desousa, Cori Jenkins, Jonathan Wilker

The Summer Undergraduate Research Fellowship (SURF) Symposium

Injuries involving damaged tissues are currently repaired through an invasive technique involving the use of screws, plates and sutures as support, which can damage these tissues. The biomedical field currently lacks an adhesive that can replace harmful implants. A surgical adhesive can provide a quick and easy alternative, which will minimize the risk of damaging healthy tissue in surgery. Inspiration for such materials can be found by looking at marine mussels as they are able to stick to nearly any surface, even in wet environments. Marine mussels affix themselves to different surfaces using adhesive plaques consisting of various proteins. Polymer ...


Effect Of Gamma Radiation On The Interfacial Reactions And Transfer Processes Of Phosphonium-Based Ionic Liquids With Carbon Steel, Ryan P. Morco 2014 Western University

Effect Of Gamma Radiation On The Interfacial Reactions And Transfer Processes Of Phosphonium-Based Ionic Liquids With Carbon Steel, Ryan P. Morco

University of Western Ontario - Electronic Thesis and Dissertation Repository

This thesis presents work on the effects of ionizing radiation on phosphonium-based ionic liquids (ILs). Ionic liquids are known for their tunable properties which make them attractive options for applications for the separation and sequestration of metal ions from spent nuclear fuels, and candidate lubricants for systems under severe conditions. The high radiation environment found in spent fuel processing may decompose the solvents (ILs) used in the process and affect their separation efficiency. The radiolytic decomposition products can also alter the physical and chemical properties of an IL in ways which can affect the potential corrosion of metal alloys in ...


Radiation Induced Corrosion Of Stellite-6, Mehran Behazin 2014 Western University

Radiation Induced Corrosion Of Stellite-6, Mehran Behazin

University of Western Ontario - Electronic Thesis and Dissertation Repository

This thesis presents a study on the aqueous corrosion of a cobalt-based alloy, Stellite-6. Since aqueous corrosion kinetics are strongly influenced by water chemistry conditions (pH, temperature, and redox agents), a systematic study of Stellite-6 corrosion was carried out. The aim was to develop an ability to predict corrosion behaviour and particularly metal dissolution rates for cobalt alloys under a range of conditions. The work focused on a study of the influence of ionizing radiation on corrosion. This is of particular interest in the nuclear industry where radiation fields are present. Ionizing radiation creates oxidizing radiolysis products and alters the ...


Computational Survey Of Peptides Derived From Disulphide-Bonded Protein Loops That May Serve As Mediators Of Protein-Protein Interactions., Fergal J. Duffy, Marc Devocelle, David R. Croucher, Denis C. Shields 2014 Royal College of Surgeons in Ireland

Computational Survey Of Peptides Derived From Disulphide-Bonded Protein Loops That May Serve As Mediators Of Protein-Protein Interactions., Fergal J. Duffy, Marc Devocelle, David R. Croucher, Denis C. Shields

Pharmaceutical and Medicinal Chemistry Articles

BACKGROUND: Bioactive cyclic peptides derived from natural sources are well studied, particularly those derived from non-ribosomal synthetases in fungi or bacteria. Ribosomally synthesised bioactive disulphide-bonded loops represent a large, naturally enriched library of potential bioactive compounds, worthy of systematic investigation.

RESULTS: We examined the distribution of short cyclic loops on the surface of a large number of proteins, especially membrane or extracellular proteins. Available three-dimensional structures highlighted a number of disulphide-bonded loops responsible for the majority of the likely binding interactions in a variety of protein complexes, due to their location at protein-protein interfaces. We find that disulphide-bonded loops at ...


Identification And Quantification Of Gaseous Organic Compounds Emitted From Biomass Burning Using Two-Dimensional Gas Chromatography/Time-Of-Flight Mass Spectrometry, L. E. Hatch, W. Luo, J. F. Pankow, Robert Yokelson, C. Stockwell, K. C. Barsanti 2014 University of Montana

Identification And Quantification Of Gaseous Organic Compounds Emitted From Biomass Burning Using Two-Dimensional Gas Chromatography/Time-Of-Flight Mass Spectrometry, L. E. Hatch, W. Luo, J. F. Pankow, Robert Yokelson, C. Stockwell, K. C. Barsanti

Chemistry and Biochemistry Faculty Publications

The current understanding of secondary organic aerosol (SOA) formation within biomass burning (BB) plumes is limited by the incomplete identification and quantification of the non-methane organic compounds (NMOCs) emitted from such fires. Gaseous organic compounds were collected on sorbent cartridges during laboratory burns as part of the fourth Fire Lab at Missoula Experiment (FLAME-4), with analysis by two-dimensional gas chromatography/time-of-flight mass spectrometry (GC×GC/TOFMS). The sensitivity and resolving power of GC×GC/TOFMS allowed the acquisition of the most extensive data set of BB NMOCs to date, with measure ments for 722 positively or tentatively identified compounds. Estimated ...


2014 Scas Annual Meeting Program, 2014 University of South Carolina

2014 Scas Annual Meeting Program

Journal of the South Carolina Academy of Science

No abstract provided.


Genotypic And Phenotypic Characterization Of Aerosolized Bacteria Collected From African Dust Events, Christina A. Wilson, Robin L. Brigmon, Chris Yeager, Garriet W. Smith, Shawn W. Polson 2014 University of South Carolina

Genotypic And Phenotypic Characterization Of Aerosolized Bacteria Collected From African Dust Events, Christina A. Wilson, Robin L. Brigmon, Chris Yeager, Garriet W. Smith, Shawn W. Polson

Journal of the South Carolina Academy of Science

Twenty-one bacteria were isolated and characterized from air samples collected in Africa and the Caribbean by the United States Geological Survey (USGS). Isolates were selected based on preliminary characterization as possible pathogens. Identification of the bacterial isolates was achieved using 16S rRNA gene sequence analysis, fatty acid methyl esters (FAMEs) profiling, the BIOLOG Microlog® System (carbon substrate assay), and repetitive extragenic palindromic (REP)-PCR analysis. The majority of isolates (18/21) were identified as species of the genus Bacillus. Three isolates were classified within the Bacillus cereus senso lato group, which includes Bacillus anthracis, Bacillus thuringiensis, and Bacillus cereus strains ...


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