Jeremiah Johnson - Academia.edu (original) (raw)

Papers by Jeremiah Johnson

Abstract : The report summarizes all work performed by Southwest Research Institute during the pa... more Abstract : The report summarizes all work performed by Southwest Research Institute during the past 8 month period in conducting an experimental study of surface effect take-off and landing (SETOL) craft skirt flutter. The test results reported were obtained utilizing two-dimensional models representing typical trunk segment configurations. Test results obtained with these models are being used to provide baseline flutter data for a corresponding theoretical effort. In addition to providing data for the theoretical work, these model tests were directed toward discovering the types of flutter oscillations that can occur, the mechanisms that are important in predicting the occurrence and magnitude of skirt flutter and the ranges of parameters over which flutter can occur.

Public Reporting burden for this collection of information is estimated to average 1 hour per res... more Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports,

Atmospheric Environment, 2015

ABSTRACT The purpose of this study was to assess the accuracy of NOx emissions in the Texas Commi... more ABSTRACT The purpose of this study was to assess the accuracy of NOx emissions in the Texas Commission on Environmental Quality's (TCEQ) State Implementation Plan (SIP) modeling inventories of the southeastern U.S. We used retrieved satellite tropospheric NO2 columns from the Ozone Monitoring Instrument (OMI) together with NO2 columns from the Comprehensive Air Quality Model with Extensions (CAMx) to make topedown NOx emissions estimates using the mass balance method. Two different top edown NOx emissions estimates were developed using the KNMI DOMINO v2.0 and NASA SP2 retrievals of OMI NO2 columns. Differences in the topedown NOx emissions estimates made with these two operational products derived from the same OMI radiance data were sufficiently large that they could not be used to constrain the TCEQ NOx emissions in the southeast. The fact that the two available operational NO2 column retrievals give such different topedown NOx emissions results is important because these retrievals are increasingly being used to diagnose air quality problems and to inform efforts to solve them. These results reflect the fact that NO2 column retrievals are a blend of measurements and modeled data and should be used with caution in analyses that will inform policy development. This study illustrates both benefits and challenges of using satellite NO2 data for air quality management applications. Comparison with OMI NO2 columns pointed the way toward improvements in the CAMx simulation of the upper troposphere, but further refinement of both regional air quality models and the NO2 column retrievals is needed before the mass balance and other emission inversion methods can be used to successfully constrain NOx emission inventories used in U.S. regulatory modeling.

Journal of neurointerventional surgery, 2014

We report a rare case of a renal cell carcinoma (RCC) metastasis occupying the cerebellopontine a... more We report a rare case of a renal cell carcinoma (RCC) metastasis occupying the cerebellopontine and cerebellomedullary cisterns, and describe an alternative strategy for embolizing hypervascular intracranial tumors. A middle aged patient with a distant history of RCC presented with headaches, nausea, and vomiting, and was found to have an enhancing mass in the left cerebellopontine and cerebellopontine cisterns. The initial surgical resection was aborted due to excessive bleeding. After an unsuccessful attempt at intra-arterial embolization, the patient returned to the operating room and the tumor was devascularized by direct needle puncture Onyx embolization under biplane fluoroscopy. The devascularized tumor was then successfully dissected from the brainstem and adherent lower cranial nerves. In properly selected cases, open surgical direct needle puncture embolization of intracranial vascular tumors under biplane fluoroscopy is a viable alternative devascularization method.

Journal of neurointerventional surgery, Jan 8, 2014

Posterior spinal artery (PSA) aneurysms are a rare cause of subarachnoid hemorrhage (SAH). The co... more Posterior spinal artery (PSA) aneurysms are a rare cause of subarachnoid hemorrhage (SAH). The commonly abused street drug 3,4-methylenedioxymethamphetamine (MDMA) or 'Ecstasy' has been linked to both systemic and neurological complications. A teenager presented with neck stiffness, headaches and nausea after ingesting 'Ecstasy'. A brain CT was negative for SAH but a CT angiogram suggested cerebral vasculitis. A lumbar puncture showed SAH but a cerebral angiogram was negative. After a spinal MR angiogram identified abnormalities on the dorsal surface of the cervical spinal cord, a spinal angiogram demonstrated a left PSA 2 mm fusiform aneurysm. The patient underwent surgery and the aneurysmal portion of the PSA was excised without postoperative neurological sequelae. 'Ecstasy' can lead to neurovascular inflammation, intracranial hemorrhage, SAH and potentially even de novo aneurysm formation and subsequent rupture. PSA aneurysms may be treated by endovascular...

Military medicine, 2014

Research indicates that dietary omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are impor... more Research indicates that dietary omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are important in reducing the risk of mental illness. We used the DoD Survey of Health Related Behaviors among Active Duty Military Personnel (HRBS) to assess current military dietary patterns and meal locations. We used the Lands Equation to model PUFAs in a sample Garrison diet and the nutritional impact of substitution of foods higher in omega-3 PUFAs and lower in omega-6 PUFAs on tissue composition. The military diet was very poor quality compared to 2010 Healthy People Guidelines. A representative Garrison diet does not meet our estimated healthy n-3 HUFA intake at 3.5 g/d, corresponding with a tissue composition of 60% n-3 in HUFA (i.e., 40% n-6 in HUFA). Substitution of n-3 rich eggs, poultry, pork and other food commodities, combined with use on low linoleic acid oils, may contribute significantly to attaining healthier n-6/n-3 proportions in the tissue.

This report was prepared as an a m u n t of work sponsored by an agency of the United States Gove... more This report was prepared as an a m u n t of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement. r a mmendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

2012 45th Hawaii International Conference on System Sciences, 2012

Emergent teams are ad hoc part-time teams of strangers with very different perspectives who are a... more Emergent teams are ad hoc part-time teams of strangers with very different perspectives who are asked by their company to come together and solve novel strategic problems. Most research on creativity has focused on individuals, with relatively little research on practices to improve group creativity. In this study we build upon our earlier qualitative research and longitudinally surveyed members of 31 different teams varying in the level of emergence. At three points in time, we asked team members about the practices they used to manage their creative process, focusing particularly on two practices: maintaining engagement, and co-creating shared boundary objects. We found that, these practices affected the customer's assessment of the team's innovativeness, but the timing of when these practices were introduced was critical. Implications for design of information systems includes 1) allowing members to maintain their engagement with the team's process even as they leave to attend to other activities and then rejoin the team, and 2) facilitate the co-creation of shared boundary objects early in the team's process. For managers, this research suggests the need to train team members in these two practices in order to further the innovative process.

2010 IEEE Frontiers in Education Conference (FIE), 2010

The purpose of this study was to better understand the entering characteristics, patterns of perf... more The purpose of this study was to better understand the entering characteristics, patterns of performance, attrition rates and reasons for leaving, and experiences of undergraduate and graduate students in the College of Engineering and other engineering disciplines, with particular emphasis on those from traditionally underrepresented groups and other subgroups of interest. All students in the College of Engineering at the University of Illinois at Urbana-Champaign were asked to participate in this study. The study was initiated under the assumption that aggregate data related to issues faced by engineering students would be used to inform discussions and decisions related to a variety of policies and practices employed by the College of Engineering. The topics covered during this study ranged broadly, but generally related to one of the following: 1) general student satisfaction; 2) recruitment and retention; 3) departmental climate; 4) students' experiences; and 5) discrimination and harassment. Engineering administrators, department heads, faculty and student representatives had a voice in the design and oversight of this study, which was conducted by a team of local evaluators.

Journal of Material Cycles and Waste Management, 2008

Abstract The flows and stocks of seven important indus-trial metals were characterized for mainla... more Abstract The flows and stocks of seven important indus-trial metals were characterized for mainland China for several years in the dynamically changing decade of 1994– 2004. One-year snapshot cycles are provided for chromium, nickel, and silver. For copper, zinc, lead, and iron, ...

Neurosurgery, 2008

eries of 2 viruses that cause pandemics in the world's population. The 2 viruses, human papilloma... more eries of 2 viruses that cause pandemics in the world's population. The 2 viruses, human papilloma virus (HPV), which causes cervical cancer, and the human immunodeficiency virus (HIV), which causes acquired immunodeficiency syndrome (AIDS), are devastating diseases that present global health threats. AIDS affects nearly 1% of the world's population, and cervical cancer is the second most common malignancy in women around the world. Harald zur Hausen, former Chairman and Scientific Director of the German Cancer Research Center, received half of the prize for his discovery and isolation of HPV, which causes cervical cancer. The other half of the prize was shared by Françoise Barré-Sinoussi,

Journal of the Air & Waste Management Association, 2013

The Community Multiscale Air Quality (CMAQ) modeling system Version 5.0 (CMAQv5.0) was released b... more The Community Multiscale Air Quality (CMAQ) modeling system Version 5.0 (CMAQv5.0) was released by the US. Environmental Protection Agency (EPA) in February 2012, with an interim release (v5.01) in July 2012. Because CMAQ is a community model, the EPA encourages the development of proven alternative science treatments by external scientists and developers that can be incorporated as part of an official CMAQ release. This paper describes the implementation, evaluation, and testing of a plume-in-grid (PinG) module in CMAQ 5.01. The PinG module, also referred to as Advanced Plume Treatment (APT), provides the capability of resolving sub-grid-scale processes, such as the transport and chemistry of point-source plumes, in a grid model. The new PinG module in CMAQ 5.01 is applied and evaluated for two 15-day summer and winter periods in 2005 to the eastern United States, and the results are compared with those from the base CMAQ 5.01. Eighteen large point sources of NO(x) in the eastern United States were selected for explicit plume treatment with APT in the PinG simulation. The results show that overall model performance is negligibly affected when PinG treatment is included. However the PinG model predicts significantly different contributions of the 18 sources to pollutant concentrations and deposition downwind of the point sources compared to the base model. This study describes the incorporation of a plume-in-grid (PinG) capability within the latest version of the EPA grid model, CMAQ. The capability addresses the inherent limitation of the grid model to resolve processes, such as the evolution of point-source plumes, which occur at scales much smaller than the grid resolution. The base grid model and the PinG version predict different source contributions to ozone and PM2.5 concentrations that need to be considered when source attribution studies are conducted to determine the impacts of large point sources on downwind concentrations and deposition of primary and secondary pollutants.

Journal of the Air & Waste Management Association, 2010

One of the most important environmental protection problems for coal-fired power plants is preven... more One of the most important environmental protection problems for coal-fired power plants is prevention of atmospheric pollution of flying ash. The ash particles are typically removed from flue gases by means of electrostatic precipitators, for which the efficiency may be significantly increased by lowering the resistance of fly ash, which may be achieved by controlled addition of microamounts of sulfur trioxide (SO3) into the flue gases. This paper describes the novel technology for production of SO3 by sulfur dioxide (SO2) oxidation using the combined catalytic system consisting of conventional vanadium catalyst and novel platinum catalyst on the base of silicazirconia glass-fiber supports. This combination provides highly efficient SO, oxidation in a wide temperature range with achievement of high SO, conversion. The performed pilot tests have demonstrated reliable and stable operation, excellent resistance of the novel catalytic system to deactivation, and high overall efficiency of the proposed process. The scale of the plant was equivalent to the commercial prototype; therefore, no further scale-up of the oxidation process is required.

Journal of the Air & Waste Management Association, 2010

This study considers potential impacts of increased use of diesel oxidation catalysts (DOCs) and ... more This study considers potential impacts of increased use of diesel oxidation catalysts (DOCs) and catalyzed diesel particulate filters (DPFs) on ozone formation in the Dallas/ Fort Worth (DFW) area. There is concern that excess nitrogen dioxide (NO2) emissions from vehicles equipped with these devices could increase ambient ozone levels. The approach involved developing two scenarios for use of these devices, quantifying excess NO2 emissions in each scenario, and using a photochemical model to estimate the resulting ozone changes. In the "maximum penetration" scenario, DOC/DPF devices in a 2009 fleet of heavy-duty on-road trucks, school buses, and construction equipment were significantly increased by accelerating turnover of these vehicles and equipment to models that would require DOCs/DPFs. In the "realistic" scenario, current fractional usage of these devices was assessed for 2009. For both scenarios, excess NO2 emissions from DOCs/DPFs were estimated using U.S. Environmental Protection Agency's MOBILE6 and NONROAD emissions inventory modeling tools. The emissions analyses were used to adjust the DFW photochemical modeling emissions inventories and the Comprehensive Air Quality Model with extensions air quality model was rerun for the DFW area to determine the impact of these two scenarios on ozone formation. The maximum penetration scenario, which showed an overall reduction in oxides of nitrogen (NO(x)) because of the accelerated turnover of equipment to cleaner models, resulted in a net decrease in daily maximum 8-hr ozone of 4-5 parts per billion (ppb) despite the increase in NO2 emissions. The realistic scenario resulted in a small increase in daily maximum 8-hr ozone of less than 1 ppb for the DFW area. It was concluded that the excess NO2 emissions from DOC/DPF devices result in very small ozone impacts, particularly for the realistic scenario, in the DFW area. There are noticeable decreases in ozone for the maximum penetration scenario because NO(x) reductions associated with DOC/DPFs (i.e., accelerated fleet turnover) exert more influence than excess NO2.

Journal of the Air & Waste Management Association, 2010

The question of how to obtain the best inocula for conventional biofilters arises when an acclima... more The question of how to obtain the best inocula for conventional biofilters arises when an acclimation/adaptation procedure is to be applied. Bearing in mind that no standardized procedure for acclimating inocula exists, certain preliminary strategies for obtaining an active inoculum from wastewater treatment sludge are proposed in this work. Toluene was the contaminant to be degraded. Concerning the prior separation of sludge phases, no obvious advantage was found in separating the supernatant phase of the sludge before acclimation. As far as a continuous or discontinuous acclimation mode is concerned, the latter is recommended for rapidly obtaining acclimated sludge samples by operating the system for no longer than 1 month. The continuous mode rendered similar degradation rates, although it required longer operating time. Nevertheless, the great advantage of the continuous system lay in the absence of daily maintenance and the ready availability of the activated sample.

Journal of the Air & Waste Management Association, 2010

The electron beam treatment technology for purification of exhaust gases from the burning of heav... more The electron beam treatment technology for purification of exhaust gases from the burning of heavy fuel oil (HFO) mazout with sulfur content approximately 3 wt % was tested at the Institute of Nuclear Chemistry and Technology laboratory plant. The parametric study was conducted to determine the sulfur dioxide (SO2), oxides of nitrogen (NO(x)), and polycyclic aromatic hydrocarbon (PAH) removal efficiency as a function of temperature and humidity of irradiated gases, absorbed irradiation dose, and ammonia stoichiometry process parameters. In the test performed under optimal conditions with an irradiation dose of 12.4 kGy, simultaneous removal efficiencies of approximately 98% for SO2, and 80% for NO(x) were recorded. The simultaneous decrease of PAH and one-ringed aromatic hydrocarbon (benzene, toluene, and xylenes [BTX]) concentrations was observed in the irradiated flue gas. Overall removal efficiencies of approximately 42% for PAHs and 86% for BTXs were achieved with an irradiation dose 5.3 kGy. The decomposition ratio of these compounds increased with an increase of absorbed dose. The decrease of PAH and BTX concentrations was followed by the increase of oxygen-containing aromatic hydrocarbon concentrations. The PAH and BTX decomposition process was initialized through the reaction with hydroxyl radicals that formed in the electron beam irradiated flue gas. Their decomposition process is based on similar principles as the primary reaction concerning SO2 and NO(x) removal; that is, free radicals attack organic compound chains or rings, causing volatile organic compound decomposition. Thus, the electron beam flue gas treatment (EBFGT) technology ensures simultaneous removal of acid (SO2 and NO(x)) and organic (PAH and BTX) pollutants from flue gas emitted from burning of HFO. This technology is a multipollutant emission control technology that can be applied for treatment of flue gas emitted from coal-, lignite-, and HFO-fired boilers. Other thermal processes such as metallurgy and municipal waste incinerators are potential candidates for this technology application.

Journal of the Air & Waste Management Association, 2010

The carbon dioxide (CO2) desorption rate from CO2- loaded aqueous diethanolamine (DEA) solutions ... more The carbon dioxide (CO2) desorption rate from CO2- loaded aqueous diethanolamine (DEA) solutions was measured using a stirred cell with a flat gas-liquid interface. The measurements were performed in the temperature range of 293.15-313.15 K and an amine concentration range of 10-20% mass DEA. Measurements were based on a semibatch isothermal absorption of the gas until the equilibrium state was reached, followed by desorption, which was initiated by the pressure release in the system. A simplified mass transfer model based on the film theory coupled with CO2, mass balance was developed to interpret the experimental data. On the basis of the proposed model, the initial mass transfer rates were calculated from the experimental results. The calculated initial desorption rates enabled estimation of the enhancement factor for CO2 mass transfer from aqueous DEA solutions. Analysis of the experimental data showed that desorption took place in the diffusive mass transfer regime.

Journal of the Air & Waste Management Association, 2010

Research and field experience with chlorine dioxide (ClO 2) gas to decontaminate structures conta... more Research and field experience with chlorine dioxide (ClO 2) gas to decontaminate structures contaminated with Bacillus anthracis spores and other microorganisms have demonstrated the effectiveness of this sterilant technology. However, because of its hazardous properties, the unreacted ClO 2 gas must be contained and captured during fumigation events. Although activated carbon has been used during some decontamination events to capture the ClO 2 gas, no data are available to quantify the performance of the activated carbon in terms of adsorption capacity and other sorbent property operational features. Laboratory experiments were conducted to determine and compare the ClO 2 adsorption capacities of five different types of activated carbon as a function of the challenge ClO 2 concentration. Tests were also conducted to investigate other sorbent properties, including screening tests to determine gaseous species desorbed from the saturated sorbent upon warming (to provide an indication of how immobile the ClO 2 gas and related compounds are once captured on the sorbent). In the adsorption tests, ClO 2 gas was measured continuously using a photometric-based instrument, and these measurements were verified with a noncontinuous method utilizing wet chemistry analysis. The results show that the simple activated carbons (not impregnated or containing other activated sorbent materials) were the most effective, with maximum adsorption capacities of approximately 110 mg/g. In the desorption tests, there was minimal release of ClO 2 from all sorbents tested, but desorption levels of chlorine (Cl 2) gas (detected as chloride) varied, with a maximum release of nearly 15% of the mass of ClO 2 adsorbed.

Journal of Inorganic Biochemistry, 2010

It has been reported that Zn 7-metallothionein (MT), contains one weak binding site for Zn 2+. To... more It has been reported that Zn 7-metallothionein (MT), contains one weak binding site for Zn 2+. To test this conclusion, rabbit liver MT isolated at pH 7 was reacted with chelating agents of modest affinity for Zn 2+. Contrary to the previous study, no evidence was found for Zn 2+ stoichiometically bound to the protein with an apparent stability constant of about 10 8. Indeed, stability constant measurements based upon competition between Zn 7-MT and ligands of known stability with Zn 2+ showed that all of the protein bound Zn 2+ displayed the same stability constant at pH 7.4 and 25° C of (1.7±0.6) × 10 11. Brief reaction of Zn 7-MT with strong acid converted it into MT* and upon reneutralization into Zn 7-MT*, which demonstrated reactivity of about 1 Zn 2+ /mol MT with competing ligands. Acid titration of Zn 7-MT to pH 2 or below rapidly resulted in the formation of Zn 7-MT* that displayed biphasic titration with base, revealing the rebinding of lower affinity Zn 2+ between pH 5 and 7. Since MT is commonly acidified during preparation, care must be taken to document which form of the protein is present in subsequent experiments at pH 7.

Abstract : The report summarizes all work performed by Southwest Research Institute during the pa... more Abstract : The report summarizes all work performed by Southwest Research Institute during the past 8 month period in conducting an experimental study of surface effect take-off and landing (SETOL) craft skirt flutter. The test results reported were obtained utilizing two-dimensional models representing typical trunk segment configurations. Test results obtained with these models are being used to provide baseline flutter data for a corresponding theoretical effort. In addition to providing data for the theoretical work, these model tests were directed toward discovering the types of flutter oscillations that can occur, the mechanisms that are important in predicting the occurrence and magnitude of skirt flutter and the ranges of parameters over which flutter can occur.

Public Reporting burden for this collection of information is estimated to average 1 hour per res... more Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports,

Atmospheric Environment, 2015

ABSTRACT The purpose of this study was to assess the accuracy of NOx emissions in the Texas Commi... more ABSTRACT The purpose of this study was to assess the accuracy of NOx emissions in the Texas Commission on Environmental Quality's (TCEQ) State Implementation Plan (SIP) modeling inventories of the southeastern U.S. We used retrieved satellite tropospheric NO2 columns from the Ozone Monitoring Instrument (OMI) together with NO2 columns from the Comprehensive Air Quality Model with Extensions (CAMx) to make topedown NOx emissions estimates using the mass balance method. Two different top edown NOx emissions estimates were developed using the KNMI DOMINO v2.0 and NASA SP2 retrievals of OMI NO2 columns. Differences in the topedown NOx emissions estimates made with these two operational products derived from the same OMI radiance data were sufficiently large that they could not be used to constrain the TCEQ NOx emissions in the southeast. The fact that the two available operational NO2 column retrievals give such different topedown NOx emissions results is important because these retrievals are increasingly being used to diagnose air quality problems and to inform efforts to solve them. These results reflect the fact that NO2 column retrievals are a blend of measurements and modeled data and should be used with caution in analyses that will inform policy development. This study illustrates both benefits and challenges of using satellite NO2 data for air quality management applications. Comparison with OMI NO2 columns pointed the way toward improvements in the CAMx simulation of the upper troposphere, but further refinement of both regional air quality models and the NO2 column retrievals is needed before the mass balance and other emission inversion methods can be used to successfully constrain NOx emission inventories used in U.S. regulatory modeling.

Journal of neurointerventional surgery, 2014

We report a rare case of a renal cell carcinoma (RCC) metastasis occupying the cerebellopontine a... more We report a rare case of a renal cell carcinoma (RCC) metastasis occupying the cerebellopontine and cerebellomedullary cisterns, and describe an alternative strategy for embolizing hypervascular intracranial tumors. A middle aged patient with a distant history of RCC presented with headaches, nausea, and vomiting, and was found to have an enhancing mass in the left cerebellopontine and cerebellopontine cisterns. The initial surgical resection was aborted due to excessive bleeding. After an unsuccessful attempt at intra-arterial embolization, the patient returned to the operating room and the tumor was devascularized by direct needle puncture Onyx embolization under biplane fluoroscopy. The devascularized tumor was then successfully dissected from the brainstem and adherent lower cranial nerves. In properly selected cases, open surgical direct needle puncture embolization of intracranial vascular tumors under biplane fluoroscopy is a viable alternative devascularization method.

Journal of neurointerventional surgery, Jan 8, 2014

Posterior spinal artery (PSA) aneurysms are a rare cause of subarachnoid hemorrhage (SAH). The co... more Posterior spinal artery (PSA) aneurysms are a rare cause of subarachnoid hemorrhage (SAH). The commonly abused street drug 3,4-methylenedioxymethamphetamine (MDMA) or 'Ecstasy' has been linked to both systemic and neurological complications. A teenager presented with neck stiffness, headaches and nausea after ingesting 'Ecstasy'. A brain CT was negative for SAH but a CT angiogram suggested cerebral vasculitis. A lumbar puncture showed SAH but a cerebral angiogram was negative. After a spinal MR angiogram identified abnormalities on the dorsal surface of the cervical spinal cord, a spinal angiogram demonstrated a left PSA 2 mm fusiform aneurysm. The patient underwent surgery and the aneurysmal portion of the PSA was excised without postoperative neurological sequelae. 'Ecstasy' can lead to neurovascular inflammation, intracranial hemorrhage, SAH and potentially even de novo aneurysm formation and subsequent rupture. PSA aneurysms may be treated by endovascular...

Military medicine, 2014

Research indicates that dietary omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are impor... more Research indicates that dietary omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are important in reducing the risk of mental illness. We used the DoD Survey of Health Related Behaviors among Active Duty Military Personnel (HRBS) to assess current military dietary patterns and meal locations. We used the Lands Equation to model PUFAs in a sample Garrison diet and the nutritional impact of substitution of foods higher in omega-3 PUFAs and lower in omega-6 PUFAs on tissue composition. The military diet was very poor quality compared to 2010 Healthy People Guidelines. A representative Garrison diet does not meet our estimated healthy n-3 HUFA intake at 3.5 g/d, corresponding with a tissue composition of 60% n-3 in HUFA (i.e., 40% n-6 in HUFA). Substitution of n-3 rich eggs, poultry, pork and other food commodities, combined with use on low linoleic acid oils, may contribute significantly to attaining healthier n-6/n-3 proportions in the tissue.

This report was prepared as an a m u n t of work sponsored by an agency of the United States Gove... more This report was prepared as an a m u n t of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement. r a mmendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

2012 45th Hawaii International Conference on System Sciences, 2012

Emergent teams are ad hoc part-time teams of strangers with very different perspectives who are a... more Emergent teams are ad hoc part-time teams of strangers with very different perspectives who are asked by their company to come together and solve novel strategic problems. Most research on creativity has focused on individuals, with relatively little research on practices to improve group creativity. In this study we build upon our earlier qualitative research and longitudinally surveyed members of 31 different teams varying in the level of emergence. At three points in time, we asked team members about the practices they used to manage their creative process, focusing particularly on two practices: maintaining engagement, and co-creating shared boundary objects. We found that, these practices affected the customer's assessment of the team's innovativeness, but the timing of when these practices were introduced was critical. Implications for design of information systems includes 1) allowing members to maintain their engagement with the team's process even as they leave to attend to other activities and then rejoin the team, and 2) facilitate the co-creation of shared boundary objects early in the team's process. For managers, this research suggests the need to train team members in these two practices in order to further the innovative process.

2010 IEEE Frontiers in Education Conference (FIE), 2010

The purpose of this study was to better understand the entering characteristics, patterns of perf... more The purpose of this study was to better understand the entering characteristics, patterns of performance, attrition rates and reasons for leaving, and experiences of undergraduate and graduate students in the College of Engineering and other engineering disciplines, with particular emphasis on those from traditionally underrepresented groups and other subgroups of interest. All students in the College of Engineering at the University of Illinois at Urbana-Champaign were asked to participate in this study. The study was initiated under the assumption that aggregate data related to issues faced by engineering students would be used to inform discussions and decisions related to a variety of policies and practices employed by the College of Engineering. The topics covered during this study ranged broadly, but generally related to one of the following: 1) general student satisfaction; 2) recruitment and retention; 3) departmental climate; 4) students' experiences; and 5) discrimination and harassment. Engineering administrators, department heads, faculty and student representatives had a voice in the design and oversight of this study, which was conducted by a team of local evaluators.

Journal of Material Cycles and Waste Management, 2008

Abstract The flows and stocks of seven important indus-trial metals were characterized for mainla... more Abstract The flows and stocks of seven important indus-trial metals were characterized for mainland China for several years in the dynamically changing decade of 1994– 2004. One-year snapshot cycles are provided for chromium, nickel, and silver. For copper, zinc, lead, and iron, ...

Neurosurgery, 2008

eries of 2 viruses that cause pandemics in the world's population. The 2 viruses, human papilloma... more eries of 2 viruses that cause pandemics in the world's population. The 2 viruses, human papilloma virus (HPV), which causes cervical cancer, and the human immunodeficiency virus (HIV), which causes acquired immunodeficiency syndrome (AIDS), are devastating diseases that present global health threats. AIDS affects nearly 1% of the world's population, and cervical cancer is the second most common malignancy in women around the world. Harald zur Hausen, former Chairman and Scientific Director of the German Cancer Research Center, received half of the prize for his discovery and isolation of HPV, which causes cervical cancer. The other half of the prize was shared by Françoise Barré-Sinoussi,

Journal of the Air & Waste Management Association, 2013

The Community Multiscale Air Quality (CMAQ) modeling system Version 5.0 (CMAQv5.0) was released b... more The Community Multiscale Air Quality (CMAQ) modeling system Version 5.0 (CMAQv5.0) was released by the US. Environmental Protection Agency (EPA) in February 2012, with an interim release (v5.01) in July 2012. Because CMAQ is a community model, the EPA encourages the development of proven alternative science treatments by external scientists and developers that can be incorporated as part of an official CMAQ release. This paper describes the implementation, evaluation, and testing of a plume-in-grid (PinG) module in CMAQ 5.01. The PinG module, also referred to as Advanced Plume Treatment (APT), provides the capability of resolving sub-grid-scale processes, such as the transport and chemistry of point-source plumes, in a grid model. The new PinG module in CMAQ 5.01 is applied and evaluated for two 15-day summer and winter periods in 2005 to the eastern United States, and the results are compared with those from the base CMAQ 5.01. Eighteen large point sources of NO(x) in the eastern United States were selected for explicit plume treatment with APT in the PinG simulation. The results show that overall model performance is negligibly affected when PinG treatment is included. However the PinG model predicts significantly different contributions of the 18 sources to pollutant concentrations and deposition downwind of the point sources compared to the base model. This study describes the incorporation of a plume-in-grid (PinG) capability within the latest version of the EPA grid model, CMAQ. The capability addresses the inherent limitation of the grid model to resolve processes, such as the evolution of point-source plumes, which occur at scales much smaller than the grid resolution. The base grid model and the PinG version predict different source contributions to ozone and PM2.5 concentrations that need to be considered when source attribution studies are conducted to determine the impacts of large point sources on downwind concentrations and deposition of primary and secondary pollutants.

Journal of the Air & Waste Management Association, 2010

One of the most important environmental protection problems for coal-fired power plants is preven... more One of the most important environmental protection problems for coal-fired power plants is prevention of atmospheric pollution of flying ash. The ash particles are typically removed from flue gases by means of electrostatic precipitators, for which the efficiency may be significantly increased by lowering the resistance of fly ash, which may be achieved by controlled addition of microamounts of sulfur trioxide (SO3) into the flue gases. This paper describes the novel technology for production of SO3 by sulfur dioxide (SO2) oxidation using the combined catalytic system consisting of conventional vanadium catalyst and novel platinum catalyst on the base of silicazirconia glass-fiber supports. This combination provides highly efficient SO, oxidation in a wide temperature range with achievement of high SO, conversion. The performed pilot tests have demonstrated reliable and stable operation, excellent resistance of the novel catalytic system to deactivation, and high overall efficiency of the proposed process. The scale of the plant was equivalent to the commercial prototype; therefore, no further scale-up of the oxidation process is required.

Journal of the Air & Waste Management Association, 2010

This study considers potential impacts of increased use of diesel oxidation catalysts (DOCs) and ... more This study considers potential impacts of increased use of diesel oxidation catalysts (DOCs) and catalyzed diesel particulate filters (DPFs) on ozone formation in the Dallas/ Fort Worth (DFW) area. There is concern that excess nitrogen dioxide (NO2) emissions from vehicles equipped with these devices could increase ambient ozone levels. The approach involved developing two scenarios for use of these devices, quantifying excess NO2 emissions in each scenario, and using a photochemical model to estimate the resulting ozone changes. In the "maximum penetration" scenario, DOC/DPF devices in a 2009 fleet of heavy-duty on-road trucks, school buses, and construction equipment were significantly increased by accelerating turnover of these vehicles and equipment to models that would require DOCs/DPFs. In the "realistic" scenario, current fractional usage of these devices was assessed for 2009. For both scenarios, excess NO2 emissions from DOCs/DPFs were estimated using U.S. Environmental Protection Agency's MOBILE6 and NONROAD emissions inventory modeling tools. The emissions analyses were used to adjust the DFW photochemical modeling emissions inventories and the Comprehensive Air Quality Model with extensions air quality model was rerun for the DFW area to determine the impact of these two scenarios on ozone formation. The maximum penetration scenario, which showed an overall reduction in oxides of nitrogen (NO(x)) because of the accelerated turnover of equipment to cleaner models, resulted in a net decrease in daily maximum 8-hr ozone of 4-5 parts per billion (ppb) despite the increase in NO2 emissions. The realistic scenario resulted in a small increase in daily maximum 8-hr ozone of less than 1 ppb for the DFW area. It was concluded that the excess NO2 emissions from DOC/DPF devices result in very small ozone impacts, particularly for the realistic scenario, in the DFW area. There are noticeable decreases in ozone for the maximum penetration scenario because NO(x) reductions associated with DOC/DPFs (i.e., accelerated fleet turnover) exert more influence than excess NO2.

Journal of the Air & Waste Management Association, 2010

The question of how to obtain the best inocula for conventional biofilters arises when an acclima... more The question of how to obtain the best inocula for conventional biofilters arises when an acclimation/adaptation procedure is to be applied. Bearing in mind that no standardized procedure for acclimating inocula exists, certain preliminary strategies for obtaining an active inoculum from wastewater treatment sludge are proposed in this work. Toluene was the contaminant to be degraded. Concerning the prior separation of sludge phases, no obvious advantage was found in separating the supernatant phase of the sludge before acclimation. As far as a continuous or discontinuous acclimation mode is concerned, the latter is recommended for rapidly obtaining acclimated sludge samples by operating the system for no longer than 1 month. The continuous mode rendered similar degradation rates, although it required longer operating time. Nevertheless, the great advantage of the continuous system lay in the absence of daily maintenance and the ready availability of the activated sample.

Journal of the Air & Waste Management Association, 2010

The electron beam treatment technology for purification of exhaust gases from the burning of heav... more The electron beam treatment technology for purification of exhaust gases from the burning of heavy fuel oil (HFO) mazout with sulfur content approximately 3 wt % was tested at the Institute of Nuclear Chemistry and Technology laboratory plant. The parametric study was conducted to determine the sulfur dioxide (SO2), oxides of nitrogen (NO(x)), and polycyclic aromatic hydrocarbon (PAH) removal efficiency as a function of temperature and humidity of irradiated gases, absorbed irradiation dose, and ammonia stoichiometry process parameters. In the test performed under optimal conditions with an irradiation dose of 12.4 kGy, simultaneous removal efficiencies of approximately 98% for SO2, and 80% for NO(x) were recorded. The simultaneous decrease of PAH and one-ringed aromatic hydrocarbon (benzene, toluene, and xylenes [BTX]) concentrations was observed in the irradiated flue gas. Overall removal efficiencies of approximately 42% for PAHs and 86% for BTXs were achieved with an irradiation dose 5.3 kGy. The decomposition ratio of these compounds increased with an increase of absorbed dose. The decrease of PAH and BTX concentrations was followed by the increase of oxygen-containing aromatic hydrocarbon concentrations. The PAH and BTX decomposition process was initialized through the reaction with hydroxyl radicals that formed in the electron beam irradiated flue gas. Their decomposition process is based on similar principles as the primary reaction concerning SO2 and NO(x) removal; that is, free radicals attack organic compound chains or rings, causing volatile organic compound decomposition. Thus, the electron beam flue gas treatment (EBFGT) technology ensures simultaneous removal of acid (SO2 and NO(x)) and organic (PAH and BTX) pollutants from flue gas emitted from burning of HFO. This technology is a multipollutant emission control technology that can be applied for treatment of flue gas emitted from coal-, lignite-, and HFO-fired boilers. Other thermal processes such as metallurgy and municipal waste incinerators are potential candidates for this technology application.

Journal of the Air & Waste Management Association, 2010

The carbon dioxide (CO2) desorption rate from CO2- loaded aqueous diethanolamine (DEA) solutions ... more The carbon dioxide (CO2) desorption rate from CO2- loaded aqueous diethanolamine (DEA) solutions was measured using a stirred cell with a flat gas-liquid interface. The measurements were performed in the temperature range of 293.15-313.15 K and an amine concentration range of 10-20% mass DEA. Measurements were based on a semibatch isothermal absorption of the gas until the equilibrium state was reached, followed by desorption, which was initiated by the pressure release in the system. A simplified mass transfer model based on the film theory coupled with CO2, mass balance was developed to interpret the experimental data. On the basis of the proposed model, the initial mass transfer rates were calculated from the experimental results. The calculated initial desorption rates enabled estimation of the enhancement factor for CO2 mass transfer from aqueous DEA solutions. Analysis of the experimental data showed that desorption took place in the diffusive mass transfer regime.

Journal of the Air & Waste Management Association, 2010

Research and field experience with chlorine dioxide (ClO 2) gas to decontaminate structures conta... more Research and field experience with chlorine dioxide (ClO 2) gas to decontaminate structures contaminated with Bacillus anthracis spores and other microorganisms have demonstrated the effectiveness of this sterilant technology. However, because of its hazardous properties, the unreacted ClO 2 gas must be contained and captured during fumigation events. Although activated carbon has been used during some decontamination events to capture the ClO 2 gas, no data are available to quantify the performance of the activated carbon in terms of adsorption capacity and other sorbent property operational features. Laboratory experiments were conducted to determine and compare the ClO 2 adsorption capacities of five different types of activated carbon as a function of the challenge ClO 2 concentration. Tests were also conducted to investigate other sorbent properties, including screening tests to determine gaseous species desorbed from the saturated sorbent upon warming (to provide an indication of how immobile the ClO 2 gas and related compounds are once captured on the sorbent). In the adsorption tests, ClO 2 gas was measured continuously using a photometric-based instrument, and these measurements were verified with a noncontinuous method utilizing wet chemistry analysis. The results show that the simple activated carbons (not impregnated or containing other activated sorbent materials) were the most effective, with maximum adsorption capacities of approximately 110 mg/g. In the desorption tests, there was minimal release of ClO 2 from all sorbents tested, but desorption levels of chlorine (Cl 2) gas (detected as chloride) varied, with a maximum release of nearly 15% of the mass of ClO 2 adsorbed.

Journal of Inorganic Biochemistry, 2010

It has been reported that Zn 7-metallothionein (MT), contains one weak binding site for Zn 2+. To... more It has been reported that Zn 7-metallothionein (MT), contains one weak binding site for Zn 2+. To test this conclusion, rabbit liver MT isolated at pH 7 was reacted with chelating agents of modest affinity for Zn 2+. Contrary to the previous study, no evidence was found for Zn 2+ stoichiometically bound to the protein with an apparent stability constant of about 10 8. Indeed, stability constant measurements based upon competition between Zn 7-MT and ligands of known stability with Zn 2+ showed that all of the protein bound Zn 2+ displayed the same stability constant at pH 7.4 and 25° C of (1.7±0.6) × 10 11. Brief reaction of Zn 7-MT with strong acid converted it into MT* and upon reneutralization into Zn 7-MT*, which demonstrated reactivity of about 1 Zn 2+ /mol MT with competing ligands. Acid titration of Zn 7-MT to pH 2 or below rapidly resulted in the formation of Zn 7-MT* that displayed biphasic titration with base, revealing the rebinding of lower affinity Zn 2+ between pH 5 and 7. Since MT is commonly acidified during preparation, care must be taken to document which form of the protein is present in subsequent experiments at pH 7.