TY - SOUND TI - Development of Photochemical Microsensors for Evaluating Light Distribution within Microalgal Photosynthetic Bioreactors AU - Karam, A.L. AU - Ducoste, J.J. AU - de los Reyes, F.L., III DA - 2017/6/22/ PY - 2017/6/22/ ER - TY - SOUND TI - Integrative Dynamic Modeling Using Diverse Biological Datasets AU - Williams, Cranos AU - Koryachko, Alexandr AU - Matthiadis, Anna AU - Muhammad, Durreshahwar AU - Brady, Siobhan M. AU - Ducoste, Joel AU - Tuck, James AU - Long, Terri A. DA - 2017/6/12/ PY - 2017/6/12/ ER - TY - CONF TI - Physiological responses of microalgae, Dunaliella viridis, during nitrogen–limited growth AU - Lai, Y. C. AU - Karam, A. AU - Ranjithan, R. AU - Levis, J. AU - de los Reyes, F.L., III AU - Ducoste, J. T2 - 7th International Conference on Biofuels, Biomass, and Bioproducts C2 - 2017/6/18/ CY - Miami, FL DA - 2017/6/18/ PY - 2017/6/18/ ER - TY - CONF TI - Quantifying Light Distributions within Microalgal Photosynthetic Bioreactors Using Novel Microsensors AU - Karam, A. AU - Lai, Y.C. AU - Liu, J. AU - Ranjithan, R. AU - Levis, J. AU - de los Reyes, F.L., III AU - Ducoste, J. T2 - 7th International Conference on Biofuels, Biomass, and Bioproducts C2 - 2017/6/18/ CY - Miami, FL DA - 2017/6/18/ PY - 2017/6/18/ ER - TY - SOUND TI - Holy Dish Pan Hands Batman, there are Soaps in the Sewers: Fats, Oil, and Grease Issues in Sewer Systems AU - Ducoste, J.J. DA - 2017/// PY - 2017/// M3 - Seminar ER - TY - SOUND TI - Drinking Water Treatment: What Happens from Source to Tap AU - Ducoste, J.J. DA - 2017/// PY - 2017/// M3 - Seminar ER - TY - SOUND TI - Raising the Value of Water: A strategy for Greater Public Health Protection AU - Ducoste, J.J. DA - 2017/// PY - 2017/// M3 - Seminar ER - TY - MGZN TI - Unintended Consequences of a Local Fats, Oils, and Grease Limits Revisions: One Utilizity’s Experience with FOG AU - Sadler, M. AU - Wischer, B. AU - Gordon, J. AU - Wilkerson, C. AU - Tabor, C. AU - Fredericks, D. AU - Ducoste, J. T2 - Horizons New Letter DA - 2017/8/28/ PY - 2017/8/28/ ER - TY - CHAP TI - Computer-Aided Human Centric Cyber Situation Awareness AU - Albanese, Massimiliano AU - Cooke, Nancy AU - Coty, González AU - Hall, David AU - Healey, Christopher AU - Jajodia, Sushil AU - Liu, Peng AU - McNeese, Michael D. AU - Ning, Peng AU - Reeves, Douglas AU - Subrahmanian, V. S. AU - Wang, Cliff AU - Yen, John T2 - Theory and Models for Cyber Situation Awareness AB - In this chapter, we provide an overview of Cyber Situational Awareness, an emerging research area in the broad field of cyber security, and discuss, at least at a high level, how to gain Cyber Situation Awareness. Our discussion focuses on answering the following questions: What is Cyber Situation Awareness? Why is research needed? What are the current research objectives and inspiring scientific principles? Why should one take a multidisciplinary approach? How could one take an end-to-end holistic approach? What are the future research directions? PY - 2017/// DO - 10.1007/978-3-319-61152-5_1 SP - 3-25 OP - PB - Springer International Publishing SN - 9783319611518 9783319611525 UR - http://dx.doi.org/10.1007/978-3-319-61152-5_1 DB - Crossref ER - TY - JOUR TI - Trends in Characteristics of Patients Listed for Liver Transplantation Will Lead to Higher Rates of Waitlist Removal Due to Clinical Deterioration AU - Yi, Zinan AU - Mayorga, Maria E. AU - Orman, Eric S. AU - Wheeler, Stephanie B. AU - Hayashi, Paul H. AU - Barritt, A. Sidney, 4th T2 - Transplantation AB - In Brief Background Changes in the epidemiology of end-stage liver disease may lead to increased risk of dropout from the liver transplant waitlist. Anticipating the future of liver transplant waitlist characteristics is vital when considering organ allocation policy. Methods We performed a discrete event simulation to forecast patient characteristics and rate of waitlist dropout. Estimates were simulated from 2015 to 2025. The model was informed by data from the Organ Procurement and Transplant Network, 2003 to 2014. National data are estimated along with forecasts for 2 regions. Results Nonalcoholic steatohepatitis will increase from 18% of waitlist additions to 22% by 2025. Hepatitis C will fall from 30% to 21%. Listings over age 60 years will increase from 36% to 48%. The hazard of dropout will increase from 41% to 46% nationally. Wait times for transplant for patients listed with a Model for End-Stage Liver Disease (MELD) between 22 and 27 will double. Region 5, which transplants at relatively higher MELD scores, will experience an increase from 53% to 64% waitlist dropout. Region 11, which transplants at lower MELD scores, will have an increase in waitlist dropout from 30% to 44%. Conclusions The liver transplant waitlist size will remain static over the next decade due to patient dropout. Liver transplant candidates will be older, more likely to have nonalcoholic steatohepatitis and will wait for transplantation longer even when listed at a competitive MELD score. There will continue to be significant heterogeneity among transplant regions where some patients will be more likely to drop out of the waitlist than receive a transplant. Using data from the Organ Procurement and Transplant Network, the authors perform an event simulation to forecast patient characteristics and rate of waitlist dropout from 2015-2025 in the US, confirming a significant increase in nonalcoholic-steatohepatitis-indication, higher waitlist dropout, and persistent heterogeneity among regions. DA - 2017/10// PY - 2017/10// DO - 10.1097/TP.0000000000001851 VL - 101 IS - 10 SP - 2368-2374 J2 - Transplantation LA - en OP - SN - 0041-1337 UR - http://dx.doi.org/10.1097/TP.0000000000001851 DB - Crossref ER - TY - JOUR TI - Multilevel predictors of colorectal cancer testing modality among publicly and privately insured people turning 50 AU - Wheeler, Stephanie B. AU - Kuo, Tzy-Mey AU - Meyer, Anne Marie AU - Martens, Christa E. AU - Hassmiller Lich, Kristen M. AU - Tangka, Florence K.L. AU - Richardson, Lisa C. AU - Hall, Ingrid J. AU - Smith, Judith Lee AU - Mayorga, Maria E. AU - Brown, Paul AU - Crutchfield, Trisha M. AU - Pignone, Michael P. T2 - Preventive Medicine Reports AB - Understanding multilevel predictors of colorectal cancer (CRC) screening test modality can help inform screening program design and implementation. We used North Carolina Medicare, Medicaid, and private, commercially available, health plan insurance claims data from 2003 to 2008 to ascertain CRC test modality among people who received CRC screening around their 50th birthday, when guidelines recommend that screening should commence for normal risk individuals. We ascertained receipt of colonoscopy, fecal occult blood test (FOBT) and fecal immunochemical test (FIT) from billing codes. Person-level and county-level contextual variables were included in multilevel random intercepts models to understand predictors of CRC test modality, stratified by insurance type. Of 12,570 publicly-insured persons turning 50 during the study period who received CRC testing, 57% received colonoscopy, whereas 43% received FOBT/FIT, with significant regional variation. In multivariable models, females with public insurance had lower odds of colonoscopy than males (odds ratio [OR] = 0.68; p < 0.05). Of 56,151 privately-insured persons turning 50 years old who received CRC testing, 42% received colonoscopy, whereas 58% received FOBT/FIT, with significant regional variation. In multivariable models, females with private insurance had lower odds of colonoscopy than males (OR = 0.43; p < 0.05). People living 10–15 miles away from endoscopy facilities also had lower odds of colonoscopy than those living within 5 miles (OR = 0.91; p < 0.05). Both colonoscopy and FOBT/FIT are widely used in North Carolina among insured persons newly age-eligible for screening. The high level of FOBT/FIT use among privately insured persons and women suggests that renewed emphasis on FOBT/FIT as a viable screening alternative to colonoscopy may be important. DA - 2017/6// PY - 2017/6// DO - 10.1016/j.pmedr.2016.11.019 VL - 6 SP - 9-16 J2 - Preventive Medicine Reports LA - en OP - SN - 2211-3355 UR - http://dx.doi.org/10.1016/j.pmedr.2016.11.019 DB - Crossref ER - TY - CHAP TI - Forecasting Recipient Outcomes of Deceased Donor Livers AU - Townsley, Rachel M. AU - Mayorga, Maria E. AU - Barritt IV, A. Sidney AU - Orman, Eric T2 - Stochastic Modeling and Analytics in Healthcare Delivery Systems PY - 2017/9/21/ DO - 10.1142/9789813220850_0008 SP - 189-209 OP - PB - WORLD SCIENTIFIC SN - 9789813220843 9789813220850 UR - http://dx.doi.org/10.1142/9789813220850_0008 DB - Crossref ER - TY - CONF TI - Unintended consequences of a local limits revision: One utility's experience with fats, oils, and grease AU - Sadler, M. AU - Wischer, B. AU - Gordon, J. AU - Wilkerson, C. AU - Tabor, C. AU - Fredericks, D. AU - Ducoste, J. C2 - 2017/// C3 - Water Environment Federation Technical Exhibition and Conference 2017, WEFTEC 2017 DA - 2017/// VL - 8 SP - 5522-5534 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85052083486&partnerID=MN8TOARS ER - TY - JOUR TI - Another grand challenge: Diversity in environmental engineering AU - Blaney, L. AU - Perlinger, J. A. AU - Bartelt-Hunt, S. L. AU - Kandiah, R. AU - Ducoste, J. T2 - Environmental Engineering Science AB - As efforts to address grand challenges in engineering move forward, one important challenge has been conspicuously absent—improving diversity in science, technology, engineering, and math fields. Previous research has shown that diverse teams perform better in a range of output measures and are better equipped to objectively and creatively evaluate problems. Here, we make the case for including diversity as a critical component of our ability to enable transformative solutions to the grand challenges in environmental engineering. DA - 2017/// PY - 2017/// DO - 10.1089/ees.2017.0337 KW - environmental engineering KW - engineering education KW - demographics KW - gender KW - ethnicity KW - race ER - TY - CONF TI - Simulating triage of patients into an internal medicine department to validate the use of an optimization-based workload score AU - Agor, J. AU - McKenzie, K. AU - Mayorga, Maria AU - Ozaltin, Osman AU - Parikh, R. S. AU - Huddleston, J. AB - This study describes a simulation model that was used to evaluate a proposed workload score. The score was designed to assist in triaging patients into the hospital services of the Division of Hospital Internal Medicine at Mayo Clinic in an effort to more equitably balance workload among the division's provider teams (or services). The first part of this study was the development of a score, using Delphi surveys, conjoint analysis, and optimization methods, that accurately represents provider workload. A simulation model was then built to test the score using historical patient data. Preliminary simulation results reported the proportion of time that each provider team spent working at or above “maximum utilization,” as defined by Mayo Clinic experts. The model yielded a 12.1% decrease (on average) in the proportion of time provider teams spent at or above maximum utilization, while simultaneously displaying a more balanced workload across provider teams. C2 - 2017/// C3 - 2017 winter simulation conference (wsc) DA - 2017/// DO - 10.1109/wsc.2017.8248011 SP - 2881–2892 ER - TY - CONF TI - Sensitivity analysis of interfacial momentum closure terms in two phase flow and boiling simulations using MCFD solver AU - Liu, Y. AU - Rollins, C. AU - Dinh, N. AU - Luo, H. AB - In this paper, a general workflow for the global Sensitivity Analysis (SA) has been proposed based on the coupling of VUQ toolkit DAKOTA and Multiphase Computational Fluid Dynamics (MCFD) solver boilEulerFoam. A surrogate model is first constructed based on sampling simulations from boilEulerFoam. This surrogate is based on Gaussian Processes Model (GPM) and is validated and proved to have good properties. The Morris Screening method is then applied based on the surrogate to those interfacial momentum closure terms for SA, including drag, lift, turbulent dispersion, wall lubrication, and virtual mass. Two different cases are considered, one is on low-pressure adiabatic flow, and the other is on high pressure boiling flow. Each case has its experimental background with data support. The radial void fraction distribution, gas velocity, relative velocity and liquid temperature (only for high pressure boiling case) are chosen as the Quantities of Interest (QoIs) which are of key interests for two-phase flow simulation and boiling crisis prediction. The interfacial force coefficient of each closure term is chosen as the input parameter. For the boiling case, the bubble diameter effect is also analyzed. Three remarks are drawn from this work on SA. First, it demonstrates the feasibility of surrogate model in the VUQ work for models in MCFD solver. The computational cost can be significantly reduced by employing the surrogate model. Secondly, through the Morris Sensitivity measurements, the importance of interfacial forces on different QoIs and regions can be analyzed and ranked for the two cases. Such analysis is also helpful for further model parameter calibration. Last but not least, the limitation of current work and the desired future work are discussed. C2 - 2017/// C3 - Proceedings of the ASME Summer Heat Transfer Conference, 2017, vol 2 DA - 2017/// DO - 10.1115/ht2017-4963 ER - TY - JOUR TI - Si doped hafnium oxide-a "fragile" ferroelectric system AU - Richter, C. AU - Schenk, T. AU - Park, M. H. AU - Tscharntke, F. A. AU - Grimley, E. D. AU - LeBeau, J. M. AU - Zhou, C. Z. AU - Fancher, C. M. AU - Jones, J. L. AU - Mikolajick, T. AU - Schroeder, U. T2 - Advanced Electronic Materials DA - 2017/// PY - 2017/// VL - 3 IS - 10 ER - TY - JOUR TI - Local structural behavior of PbZr0.5Ti0.5O3 during electric field application via in situ pair distribution function study AU - Zhao, C. H. AU - Hou, D. AU - Chung, C. C. AU - Yu, Y. Y. AU - Liu, W. F. AU - Li, S. T. AU - Jones, J. L. T2 - Journal of Applied Physics DA - 2017/// PY - 2017/// VL - 122 IS - 17 ER - TY - JOUR TI - Heat Generation and Accumulation in Municipal Solid Waste Landfills AU - Hao, Zisu AU - Sun, Mei AU - Ducoste, Joel J. AU - Benson, Craig H. AU - Luettich, Scott AU - Castaldi, Marco J. AU - Barlaz, Morton A. T2 - Environmental Science & Technology AB - There have been reports of North American landfills that are experiencing temperatures in excess of 80-100 °C. However, the processes causing elevated temperatures are not well understood. The objectives of this study were to develop a model to describe the generation, consumption and release of heat from landfills, to predict landfill temperatures, and to understand the relative importance of factors that contribute to heat generation and accumulation. Modeled heat sources include energy from aerobic and anaerobic biodegradation, anaerobic metal corrosion, ash hydration and carbonation, and acid-base neutralization. Heat removal processes include landfill gas convection, infiltration, leachate collection, and evaporation. The landfill was treated as a perfectly mixed batch reactor. Model predictions indicate that both anaerobic metal corrosion and ash hydration/carbonation contribute to landfill temperatures above those estimated from biological reactions alone. Exothermic pyrolysis of refuse, which is hypothesized to be initiated due to a local accumulation of heat, was modeled empirically to illustrate its potential impact on heat generation. DA - 2017/10/11/ PY - 2017/10/11/ DO - 10.1021/acs.est.7b01844 VL - 51 IS - 21 SP - 12434-12442 J2 - Environ. Sci. Technol. LA - en OP - SN - 0013-936X 1520-5851 UR - http://dx.doi.org/10.1021/acs.est.7b01844 DB - Crossref ER - TY - JOUR TI - Sustainability index development for manufacturing industry AU - Latif, Hasan H. AU - Gopalakrishnan, Bhaskaran AU - Nimbarte, Ashish AU - Currie, Kenneth T2 - SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS AB - Manufacturing industries are adopting new techniques and philosophies to address the acute shortage of non-renewable energy. Many of these manufacturing industries are focusing on achieving sustainability in every possible stage of their production, from raw material to the recycling of waste. Thus, the significance of using renewable energy, properly handling waste, and progressively conserving the environment is increasing day by day. In this research, the definition of sustainability is quite specific: being productive while making little to no impact on non-replenishable resources. The objective of the research is to determine the sustainability index of manufacturing plants. Since the topic has a broad scope, this research is limited to small and medium scale industries, which have common sets of operation and defined process plans. Besides, the focus is on non-hazardous waste and the indicators of the index are selected with respect to energy efficiency, workers’ health and safety and waste reduction potential. An interactive model has been developed to determine the sustainability index based on user responses. Based on the sustainable index, the model is able to provide suggestions to improve sustainability as well as carbon footprint reduction. The research has used datasets from various projects of the Industrial Assessment Center (IAC) at West Virginia University to build the knowledge database. The interactive model is validated by case studies from the IAC. The outcome of this research is a model that can assist industry to identify their shortcomings in achieving sustainability, determine the carbon footprint reduction potential, and compare the sustainability index as a benchmark measure. DA - 2017/12// PY - 2017/12// DO - 10.1016/j.seta.2017.01.010 VL - 24 SP - 82-95 SN - 2213-1396 KW - Sustainability KW - Index methodology KW - Manufacturing industry KW - Carbon footprint KW - Energy efficiency ER - TY - JOUR TI - A critical review of fat, oil, and grease (FOG) in sewer collection systems: Challenges and control AU - He, Xia AU - de los Reyes, Francis L., III AU - Ducoste, Joel J. T2 - Critical Reviews in Environmental Science and Technology AB - Fat, oil, and grease (FOG) released into the sewer collection system have resulted in the production of insoluble solids, leading to FOG blockages in sanitary sewer pipes and consequently sanitary sewer overflows (SSOs). FOG-related SSOs continue to be a global challenge for municipalities responsible for maintaining the conveyance of wastewater in sanitary sewer systems. To provide a comprehensive understanding of FOG control in sewers, this paper critically reviews the scientific literature on the FOG deposit formation process, sources of components involved in FOG deposit formation, and solutions to the problems caused by FOG in sewer systems. The implications of these findings were also evaluated to provide support for pretreatment managers responsible for sewer collection system maintenance. Finally, the ongoing challenges in further understanding the FOG deposit formation process, the distribution of the sources of FOG/free fatty acids, the installation and maintenance of grease interceptors (GIs), and the recovery of energy from GI waste and FOG deposits, were also discussed to determine future research directions. DA - 2017/7/3/ PY - 2017/7/3/ DO - 10.1080/10643389.2017.1382282 VL - 47 IS - 13 SP - 1191-1217 J2 - Critical Reviews in Environmental Science and Technology LA - en OP - SN - 1064-3389 1547-6537 UR - http://dx.doi.org/10.1080/10643389.2017.1382282 DB - Crossref KW - Fat; oil; grease (FOG) KW - sewer blockage KW - sanitary sewer overflows (SSOs) ER - TY - JOUR TI - Field-induced antiferroelectric to ferroelectric transitions in (Pb1-xLax)(Zr0.90Ti0.10)(1-x)/O-4(3) investigated by in situ X-ray diffraction AU - Ciuchi, I. V. AU - Chung, C. C. AU - Fancher, C. M. AU - Guerrier, J. AU - Forrester, J. S. AU - Jones, J. L. AU - Mitoseriu, L. AU - Galassi, C. T2 - JOURNAL OF THE EUROPEAN CERAMIC SOCIETY AB - Phase transitions and field-induced preferred orientation in (Pb1-xLax)(Zr0.90Ti0.10)1–x/4O3 (PLZT x/90/10) ceramics upon electric field cycling using in situ X-ray diffraction were studied. The evolution of the {200}pc and {111}pc diffraction line profiles indicate that PLZT 4/90/10 and PLZT 3/90/10 compositions undergo an antiferroelectric (AFE)–ferroelectric (FE) phase switching. Both PLZT 4/90/10 and PLZT 3/90/10 exhibit irreversible preferred orientation after experiencing the field-induced AFE-to-FE phase switching. An electric field-induced structure develops in both compositions which has a reversible character during the field decreasing in PLZT 4/90/10 and an irreversible character in PLZT 3/90/10. In addition, structural analysis of pre-poled PLZT 3/90/10 ceramics show that it is possible to induce consecutive FE-to-AFE and AFE-to-FE transitions when fields of reversed polarity are applied in sequence. The field range required to induce the AFE phase is broad, and the phase transition is kinetically slow. This kind of transition has rarely been reported before. DA - 2017/12// PY - 2017/12// DO - 10.1016/j.jeurceramsoc.2017.06.018 VL - 37 IS - 15 SP - 4631-4636 SN - 1873-619X KW - Antiferroelectricity KW - Antiferroelectric-ferroelectric phase KW - switching KW - Ferroelectricity KW - Field induced structural transition ER - TY - JOUR TI - Lane utilization model development for diverging diamond interchanges AU - Yeom, C. AU - Schroeder, B. J. AU - Cunningham, C. AU - Salamati, K. AU - Rouphail, N. M. T2 - Transportation Research Record DA - 2017/// PY - 2017/// IS - 2618 SP - 27-37 ER - TY - JOUR TI - Closure to "Modified Plastic-Hinge Method for Circular RC Bridge Columns" by Jason C. Goodnight, Mervyn J. Kowalsky, and James M. Nau AU - Goodnight, Jason C. AU - Kowalsky, Mervyn J. AU - Nau, James M. T2 - JOURNAL OF STRUCTURAL ENGINEERING DA - 2017/9// PY - 2017/9// DO - 10.1061/(asce)st.1943-541x.0001867 VL - 143 IS - 9 SP - SN - 1943-541X ER - TY - JOUR TI - Addressing Raveling Resistance in Chip Seal Specifications AU - Adams, Javon AU - Castorena, Cassie AU - Im, Jeong Hyuk AU - Ilias, Mohammad AU - Kim, Y. Richard T2 - TRANSPORTATION RESEARCH RECORD AB - Chip seals are applied to existing roadways to slow deterioration and improve pavement surface conditions without increasing the pavement’s structural capacity. The raveling of chip seals can cause damage to vehicles and thus is a safety concern. Raveling resistance is related to both material application rates and material properties. The current chip seal specifications fail to adequately address the material-related aspects of raveling resistance. This study seeks to develop recommendations to address raveling resistance in future chip seal specifications. Strain sweep binder tests, binder bond strength (BBS) tests, and Vialit chip seal mixture tests were conducted to assess early raveling, late raveling, and wet raveling at two intermediate temperatures. The results demonstrate that the bond that develops between the residual binder and the aggregate is highly dependent on the interaction between the emulsion and the aggregate during curing. The importance of emulsion–aggregate compatibility in raveling resistance indicates that raveling resistance cannot be addressed in binder specifications alone. Rather, it is recommended that intermediate temperature raveling resistance should be addressed during chip seal mixture design. Vialit and BBS tests, in which emulsion is cured on rock, can both be used to effectively quantify the aggregate loss potential of a chip seal. These two tests are able to capture the benefits of polymer modification and produce results that correlate. However, the Vialit tests are easier to implement than the BBS tests and require no expensive equipment. Therefore, Vialit tests are recommended to address early, late, and wet raveling resistance in future chip seal specifications. DA - 2017/// PY - 2017/// DO - 10.3141/2612-05 IS - 2612 SP - 39-46 SN - 2169-4052 ER - TY - JOUR TI - T-Chain: A General Incentive Scheme for Cooperative Computing AU - Shin, Kyuyong AU - Joe-Wong, Carlee AU - Ha, Sangtae AU - Yi, Yung AU - Rhee, Injong AU - Reeves, Douglas S. T2 - IEEE-ACM TRANSACTIONS ON NETWORKING AB - In this paper, we propose a simple, distributed, but highly efficient fairness-enforcing incentive mechanism for cooperative computing. The proposed mechanism, called triangle chaining (T-Chain), enforces reciprocity to avoid the exploitable aspects of the schemes that allow free-riding. In T-Chain, symmetric key cryptography provides the basis for a lightweight, almost-fair exchange protocol, which is coupled with a pay-it-forward mechanism. This combination increases the opportunity for multi-lateral exchanges and further maximizes the resource utilization of participants, each of whom is assumed to operate solely for his or her own benefit. T-Chain also provides barrier-free entry to newcomers with flexible resource allocation, allowing them to immediately benefit, and, therefore, is suitable for dynamic environments with high churn (i.e., turnover). T-Chain is distributed and simple to implement, as no trusted third party is required to monitor or enforce the scheme, nor is there any reliance on reputation information or tokens. DA - 2017/8// PY - 2017/8// DO - 10.1109/tnet.2017.2685560 VL - 25 IS - 4 SP - 2122-2137 SN - 1558-2566 KW - Cooperative communication KW - reciprocity KW - symmetric encryption ER - TY - JOUR TI - Investigating Pb diffusion across buried interfaces in Pb(Zr0.2Ti0.8)O-3 thin films via time-of-flight secondary ion mass spectrometry depth profiling AU - Mangum, John S. AU - Podowitz-Thomas, Stephen AU - Nikkel, Jason AU - Zhou, Chuanzhen AU - Jones, Jacob L. T2 - SURFACE AND INTERFACE ANALYSIS AB - The diffusion of Pb through Pb(Zr0.2Ti0.8)O3(PZT)/Pt/Ti/SiO2/Si thin film heterostructures is studied by using time-of-flight secondary ion mass spectrometry depth profiling. The as-deposited films initially contained 10 mol% Pb excess and were thermally processed at temperatures ranging from 325 to 700°C to promote Pb diffusion. The time-of-flight secondary ion mass spectrometry depth profiles show that increasing processing temperature promoted Pb diffusion from the PZT top film into the buried heterostructure layers. After processing at low temperatures (eg, 325°C), Pb+ counts were low in the Pt region. After processing at elevated temperatures (eg, 700°C), significant Pb+ counts were seen throughout the Pt layer and into the Ti and SiO2 layers. Intermediate processing temperatures (400, 475, and 500°C) resulted in Pb+ profiles consistent with this overall trend. Films processed at 400°C show a sharp peak in PtPb+ intensity at the PZT/Pt interface, consistent with prior reports of a Pt3Pb phase at this interface after processing at similar temperatures. DA - 2017/10// PY - 2017/10// DO - 10.1002/sia.6255 VL - 49 IS - 10 SP - 973-977 SN - 1096-9918 KW - depth profiling KW - lead diffusion KW - lead zirconate titanate KW - PZT KW - time-of-flight secondary ion mass spectrometry KW - ToF-SIMS ER - TY - JOUR TI - Grain orientation effects on the ionic conductivity of neodymia doped ceria thin films AU - Baure, George AU - Zhou, Hanhan AU - Chung, Ching-Chang AU - Stozhkova, Mariia A. AU - Jones, Jacob L. AU - Nino, Juan C. T2 - ACTA MATERIALIA AB - It is generally accepted that grain boundaries in the path of transport are detrimental to ionic conductivity. To delve deeper into the connection between grain boundaries and ionic transport, the relative orientations of the grains were determined using the transmission Kikuchi diffraction technique. Nanocrystalline (grain size ∼ 40 nm) neodymia doped ceria thin films grown via pulsed laser deposition amplify the effect of these intrinsic interfaces. In addition, this deposition technique allowed the growth of partially amorphous and columnar grained films. Further, the strength of the texture in the columnar grained films was modified by changing substrates. The in-plane impedance measurements were able to isolate the response of the film from the response of the electrode interface and confirmed the majority carriers were oxygen vacancies at low temperatures. The anionic conductivity improved as the strength of the texture in the films increased. The conductivity of the strongly textured films was 2 orders of magnitude higher than the conductivity of the randomly oriented ones between 300 and 400 °C. Also, the in-plane conductivity per grain was more than 3 orders of magnitude higher in the strongly textured film than in the poorly textured one indicating conductivity is not dependent on grain boundary density. IV measurements revealed that grain boundaries posed a potential barrier to anions in the poorly textured and randomly oriented films, but not in the strongly textured samples. The type of grain boundary was deemed a contributing factor. Boundaries between more misaligned grains were more resistive decreasing the total conductivity. DA - 2017/7/1/ PY - 2017/7/1/ DO - 10.1016/j.actamat.2017.05.030 VL - 133 SP - 81-89 SN - 1873-2453 KW - Transmission Kikuchi diffraction KW - Grain boundaries KW - Doped ceria KW - Impedance spectroscopy KW - Thin films ER - TY - JOUR TI - The optimal assignment of spontaneous volunteers AU - Mayorga, Maria E. AU - Lodree, Emmett J. AU - Wolczynski, Justin T2 - Journal of the Operational Research Society AB - Spontaneous volunteers are ordinary citizens who assist in disaster relief efforts, while they are a great resource they also pose a difficult logistical challenge. Unlike classical labor assignment problems, the management of these volunteers is characterized by uncertainty regarding the size, availability, and commitment of the labor pool. We model this problem as a multi-server queueing system with both stochastic server arrival and abandonment. This model is intended to be applied to the relatively stable work associated with recovery efforts, e.g., debris clearing. We model this system as a continuous time Markov decision process and compare the optimal policy to several common-sense heuristics; one of which performs close to optimal and makes a practical alternative. We conduct extensive sensitivity analysis around model parameters and assumptions. DA - 2017/9// PY - 2017/9// DO - 10.1057/s41274-017-0219-2 VL - 68 IS - 9 SP - 1106-1116 J2 - Journal of the Operational Research Society LA - en OP - SN - 0160-5682 1476-9360 UR - http://dx.doi.org/10.1057/s41274-017-0219-2 DB - Crossref KW - volunteer assignment KW - disaster operations management KW - Markov decision process ER - TY - JOUR TI - Construction and Setup of a Bench-scale Algal Photosynthetic Bioreactor with Temperature, Light, and pH Monitoring for Kinetic Growth Tests AU - Karam, Amanda L. AU - McMillan, Catherine C. AU - Lai, Yi-Chun AU - de los Reyes, Francis L., III AU - Sederoff, Heike W. AU - Grunden, Amy M. AU - Ranjithan, Ranji S. AU - Levis, James W. AU - Ducoste, Joel J. T2 - Journal of Visualized Experiments AB - The optimal design and operation of photosynthetic bioreactors (PBRs) for microalgal cultivation is essential for improving the environmental and economic performance of microalgae-based biofuel production. Models that estimate microalgal growth under different conditions can help to optimize PBR design and operation. To be effective, the growth parameters used in these models must be accurately determined. Algal growth experiments are often constrained by the dynamic nature of the culture environment, and control systems are needed to accurately determine the kinetic parameters. The first step in setting up a controlled batch experiment is live data acquisition and monitoring. This protocol outlines a process for the assembly and operation of a bench-scale photosynthetic bioreactor that can be used to conduct microalgal growth experiments. This protocol describes how to size and assemble a flat-plate, bench-scale PBR from acrylic. It also details how to configure a PBR with continuous pH, light, and temperature monitoring using a data acquisition and control unit, analog sensors, and open-source data acquisition software. DA - 2017/6/14/ PY - 2017/6/14/ DO - 10.3791/55545 VL - 6 IS - 124 J2 - JoVE LA - en OP - SN - 1940-087X UR - http://dx.doi.org/10.3791/55545 DB - Crossref KW - Bioengineering KW - Issue 124 KW - Photosynthetic bioreactors KW - microalgae KW - growth kinetics KW - biofuel KW - temperature KW - light KW - pH KW - automated monitoring ER - TY - CONF TI - A model to describe heat generation and accumulation at municipal solid waste landfills AU - Hao, Z. S. AU - Sun, M. AU - Ducoste, J. AU - Barlaz, M. AB - There have been reports of landfills in North America that are experiencing elevated temperatures that are resulting in challenging issues for landfill management. The objective of this study is to develop a box model to describe the generation, consumption and release of heat in landfills and subsequently to predict temperature profiles. Initially, a box model was developed that treats the landfill as a completely mixed system in which all relevant reactions are described. This model will make it possible to identify processes and reactions that are most significant. The model is based on thermodynamic principles and accounts for all significant heat sources and sinks in landfills. Heat sources include energy from biotic and abiotic reactions and condensation. Heat removal processes include convection of methane and carbon dioxide, infiltration, leachate collection and evaporation. The model was used to evaluate the heat generation performance of aerobic and anaerobic biodegradation of waste with and without the presence of ash (from coal or municipal solid waste). The model analysis showed that the hydration of ash can increase landfill temperature above that predicted for the disposal of municipal solid waste alone. C2 - 2017/// C3 - Geotechnical frontiers 2017: waste containment, barriers, remediation, and sustainable geoengineering DA - 2017/// DO - 10.1061/9780784480434.030 SP - 281–288 M1 - 276 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85018730979&partnerID=MN8TOARS ER - TY - JOUR TI - Temperature dependence of field-responsive mechanisms in lead zirconate titanate AU - Chung, Ching-Chang AU - Fancher, Chris M. AU - Isaac, Catherine AU - Nikkel, Jason AU - Hennig, Eberhard AU - Jones, Jacob L. T2 - JOURNAL OF THE AMERICAN CERAMIC SOCIETY AB - Abstract An electric field loading stage was designed for use in a laboratory diffractometer that enables in situ investigations of the temperature dependence in the field response mechanisms of ferroelectric materials. The stage was demonstrated by measuring PbZr 1− x Ti x O 3 ( PZT ) based materials—a commercially available PZT and a 1% Nb‐doped PbZr 0.56 Ti 0.44 O 3 ( PZT 56/44)—over a temperature range of 25°C to 250°C. The degree of non‐180° domain alignment (η 002 ) of the PZT as a function of temperature was quantified. η 002 of the commercially available PZT increases exponentially with temperature, and was analyzed as a thermally activated process as described by the Arrhenius law. The activation energy for thermally activated domain wall depinning process in PZT was found to be 0.47 eV . Additionally, a field‐induced rhombohedral to tetragonal phase transition was observed 5°C below the rhombohedral‐tetragonal transition in PZT 56/44 ceramic. The field‐induced tetragonal phase fraction was increased 41.8% after electrical cycling. A large amount of domain switching (η 002 =0.45 at 1.75 kV/mm) was observed in the induced tetragonal phase. DA - 2017/9// PY - 2017/9// DO - 10.1111/jace.14979 VL - 100 IS - 9 SP - 4352-4361 SN - 1551-2916 KW - domains KW - ferroelectricity KW - ferroelectric materials KW - lead zirconate titanate KW - phase transformations KW - X-ray methods ER - TY - JOUR TI - Integrated In Situ Characterization of a Molten Salt Catalyst Surface: Evidence of Sodium Peroxide and Hydroxyl Radical Formation AU - Takanabe, Kazuhiro AU - Khan, Abdulaziz M. AU - Tang, Yu AU - Nguyen, Luan AU - Ziani, Ahmed AU - Jacobs, Benjamin W. AU - Elbaz, Ayman M. AU - Sarathy, S. Mani AU - Tao, Franklin T2 - ANGEWANDTE CHEMIE-INTERNATIONAL EDITION AB - Abstract Sodium‐based catalysts (such as Na 2 WO 4 ) were proposed to selectively catalyze OH radical formation from H 2 O and O 2 at high temperatures. This reaction may proceed on molten salt state surfaces owing to the lower melting point of the used Na salts compared to the reaction temperature. This study provides direct evidence of the molten salt state of Na 2 WO 4 , which can form OH radicals, using in situ techniques including X‐ray diffraction (XRD), scanning transmission electron microscopy (STEM), laser induced fluorescence (LIF) spectrometry, and ambient‐pressure X‐ray photoelectron spectroscopy (AP‐XPS). As a result, Na 2 O 2 species, which were hypothesized to be responsible for the formation of OH radicals, have been identified on the outer surfaces at temperatures of ≥800 °C, and these species are useful for various gas‐phase hydrocarbon reactions, including the selective transformation of methane to ethane. DA - 2017/8/21/ PY - 2017/8/21/ DO - 10.1002/anie.201704758 VL - 56 IS - 35 SP - 10403-10407 SN - 1521-3773 KW - ambient-pressure XPS KW - heterogeneous catalysis KW - hydroxyl radicals KW - oxidative coupling KW - sodium peroxide ER - TY - JOUR TI - Flexible inorganic ferroelectric thin films for nonvolatile memory devices AU - Yu, H. AU - Chung, C. C. AU - Shewmon, N. AU - Ho, S. AU - Carpenter, J. H. AU - Larrabee, R. AU - Sun, T. L. AU - Jones, J. L. AU - Ade, H. AU - O'Connor, B. T. AU - So, F. T2 - Advanced Functional Materials DA - 2017/// PY - 2017/// VL - 27 IS - 21 ER - TY - JOUR TI - Doped Hf0.5Zr0.5O2 for high efficiency integrated supercapacitors AU - Lomenzo, P. D. AU - Chung, C. C. AU - Zhou, C. Z. AU - Jones, J. L. AU - Nishida, T. T2 - Applied Physics Letters DA - 2017/// PY - 2017/// VL - 110 IS - 23 ER - TY - JOUR TI - Cost-Effectiveness Analysis of Four Simulated Colorectal Cancer Screening Interventions, North Carolina AU - Hassmiller Lich, Kristen AU - Cornejo, David A. AU - Mayorga, Maria E. AU - Pignone, Michael AU - Tangka, Florence K.L. AU - Richardson, Lisa C. AU - Kuo, Tzy-Mey AU - Meyer, Anne-Marie AU - Hall, Ingrid J. AU - Smith, Judith Lee AU - Durham, Todd A. AU - Chall, Steven A. AU - Crutchfield, Trisha M. AU - Wheeler, Stephanie B. T2 - Preventing Chronic Disease AB - Preventing Chronic Disease (PCD) is a peer-reviewed electronic journal established by the National Center for Chronic Disease Prevention and Health Promotion. PCD provides an open exchange of information and knowledge among researchers, practitioners, policy makers, and others who strive to improve the health of the public through chronic disease prevention. DA - 2017/2/23/ PY - 2017/2/23/ DO - 10.5888/pcd14.160158 VL - 14 SP - J2 - Prev. Chronic Dis. OP - SN - 1545-1151 UR - http://dx.doi.org/10.5888/pcd14.160158 DB - Crossref ER - TY - JOUR TI - Changes in cigarette smoking initiation, cessation, and relapse among US adults: a comparison of two longitudinal samples AU - Yi, Zinan AU - Mayorga, Maria E. AU - Lich, Kristen Hassmiller AU - Pearson, Jennifer L. T2 - TOBACCO INDUCED DISEASES AB - 1. World Health Organization: Tobacco. http://www.who.int/mediacentre... factsheets/fs339/en. Accessed 12 June 2016. Google Scholar DA - 2017/3/14/ PY - 2017/3/14/ DO - 10.1186/s12971-017-0121-3 VL - 15 SP - SN - 1617-9625 KW - Smoking KW - Initiation KW - Cessation KW - Relapse KW - Cigarette ER - TY - JOUR TI - A comprehensive study on the structural evolution of HfO2 thin films doped with various dopants AU - Park, M. H. AU - Schenk, T. AU - Fancher, C. M. AU - Grimley, E. D. AU - Zhou, C. AU - Richter, C. AU - LeBeau, J. M. AU - Jones, J. L. AU - Mikolajick, T. AU - Schroeder, U. T2 - JOURNAL OF MATERIALS CHEMISTRY C AB - Quantitative phase analysis is first performed on doped Hafnia films to elucidate the structural origin of unexpected ferroelectricity. DA - 2017/5/21/ PY - 2017/5/21/ DO - 10.1039/c7tc01200d VL - 5 IS - 19 SP - 4677-4690 SN - 2050-7534 ER - TY - JOUR TI - A Maximum Expected Covering Problem for District Design AU - Ansari, Sardar AU - McLay, Laura Albert AU - Mayorga, Maria E. T2 - Transportation Science AB - The optimal location of ambulances in a geographic region is interrelated with how the ambulances are dispatched to patients. Papers in the literature often treat the location and dispatching of ambulance separately. In this paper, we propose a novel mixed integer linear programming (MILP) model that determines how to locate and dispatch ambulances through district design. The model allows for uncertainty in both ambulance travel times and ambulance availability, and it maximizes the coverage level, i.e., the fraction of high-priority calls that can be responded to within a fixed-time threshold. The proposed MILP model determines the stations where ambulances should be located and assigns each call location to the open ambulance stations according to a preference list. The preference list is a rank ordering of the ambulances to assign to patients at a call location, from the most to the least preferred. The preference lists partition the region into a series of response districts that depend on ambulance availability, and the model balances the workload among the servers and maintains contiguity in the first priority response districts. The underlying ambulance queuing dynamics introduce nonlinearities to the model. To maintain a linear model, we use a Hypercube approximation model to estimate several of the inputs, and we provide an iterative algorithm to update the input parameters and solve the resulting MILP model. A computational example illustrates the modeling paradigm and solution algorithm using a real-world example. The results suggest that the reduction in coverage to maintain contiguity and balanced workloads among the ambulances is small. DA - 2017/2// PY - 2017/2// DO - 10.1287/trsc.2015.0610 VL - 51 IS - 1 SP - 376-390 J2 - Transportation Science LA - en OP - SN - 0041-1655 1526-5447 UR - http://dx.doi.org/10.1287/trsc.2015.0610 DB - Crossref KW - emergency medical services KW - expected covering models KW - queuing approximations KW - Hypercube correction factors KW - load balancing KW - district contiguity ER - TY - JOUR TI - Modeling fats, oil and grease deposit formation and accumulation in sewer collection systems AU - Yousefelahiyeh, Roya AU - Dominic, Christopher Cyril Sandeep AU - Ducoste, Joel T2 - JOURNAL OF HYDROINFORMATICS AB - Fats, oil and grease (FOG) deposits in sewer systems are responsible for approximately 25% of all annual line blockages in the United States and lead to the release of 3–10 million gallons of untreated wastewater to the surrounding environment. Considerable effort has been made to maintain the conveyance of wastewater by cleaning pipes that have a significant FOG deposit accumulation. Changes in the urban landscape from the addition or deletion of food service establishments (FSEs), however, may pose challenges in determining the location of these high accumulation zones. This research focuses on the development of a sewer collection system model that predicts high FOG deposit accumulation zones. Two collection systems were simulated to test the prediction capabilities of the tool and to assess how changes in the urban landscape affect the location of these accumulation zones. The numerical tool incorporates a mechanistic-based FOG deposit formation kinetic model. Results showed that the model predicts about 65% of the reported high FOG deposit accumulating zones. Simulations also showed significant changes in the location of these high FOG deposit accumulating zones from changes in the number and locations of FSEs and from FSE discharge and background wastewater flow variations. DA - 2017/5// PY - 2017/5// DO - 10.2166/hydro.2017.016 VL - 19 IS - 3 SP - 443-455 SN - 1465-1734 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85018765260&partnerID=MN8TOARS KW - FOG deposits KW - food service establishment KW - numerical modeling KW - sanitary sewer overflows KW - sewer collection system KW - wastewater conveyance ER - TY - JOUR TI - Attenuated Total Reflectance Fourier transform infrared spectroscopy for determination of Long Chain Free Fatty Acid concentration in oily wastewater using the double wavenumber extrapolation technique AU - Hao, Zisu AU - Malyala, Divya AU - Dean, Lisa AU - Ducoste, Joel T2 - TALANTA AB - Long Chain Free Fatty Acids (LCFFAs) from the hydrolysis of fat, oil and grease (FOG) are major components in the formation of insoluble saponified solids known as FOG deposits that accumulate in sewer pipes and lead to sanitary sewer overflows (SSOs). A Double Wavenumber Extrapolative Technique (DWET) was developed to simultaneously measure LCFFAs and FOG concentrations in oily wastewater suspensions. This method is based on the analysis of the Attenuated Total Reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) spectrum, in which the absorbance of carboxyl bond (1710cm-1) and triglyceride bond (1745cm-1) were selected as the characteristic wavenumbers for total LCFFAs and FOG, respectively. A series of experiments using pure organic samples (Oleic acid/Palmitic acid in Canola oil) were performed that showed a linear relationship between the absorption at these two wavenumbers and the total LCFFA. In addition, the DWET method was validated using GC analyses, which displayed a high degree of agreement between the two methods for simulated oily wastewater suspensions (1-35% Oleic acid in Canola oil/Peanut oil). The average determination error of the DWET approach was ~5% when the LCFFA fraction was above 10wt%, indicating that the DWET could be applied as an experimental method for the determination of both LCFFAs and FOG concentrations in oily wastewater suspensions. Potential applications of this DWET approach includes: (1) monitoring the LCFFAs and FOG concentrations in grease interceptor (GI) effluents for regulatory compliance; (2) evaluating alternative LCFFAs/FOG removal technologies; and (3) quantifying potential FOG deposit high accumulation zones in the sewer collection system. DA - 2017/4/1/ PY - 2017/4/1/ DO - 10.1016/j.talanta.2017.01.006 VL - 165 SP - 526-532 SN - 1873-3573 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85009062833&partnerID=MN8TOARS KW - Long chain free fatty acids KW - Attenuated Total Reflectance KW - Fourier transform infrared spectroscopy KW - Double wavenumber extrapolation technique KW - Sanitary sewer overflows ER - TY - JOUR TI - The effect of a roundabout corridor's design on selecting the optimal crosswalk location: A multi-objective impact analysis AU - Fernandes, P. AU - Salamati, K. AU - Rouphail, N. M. AU - Coelho, M. C. T2 - INTERNATIONAL JOURNAL OF SUSTAINABLE TRANSPORTATION AB - Crosswalks located at mid-block segment between roundabouts can provide a good balance among delay, carbon dioxide (CO2) emissions, and relative difference between vehicles and pedestrians speed. However, when considering local pollutant criteria, the optimal crosswalk location may be different to that obtained for CO2. This paper described a multi-objective analysis of pedestrian crosswalk locations, with the objectives of minimizing delay, emissions, and relative difference between vehicles and pedestrians speed. Accounting for the difference between global (e.g., CO2) and local pollutants (monoxide carbon, nitrogen oxides, and hydrocarbons) was one the main considerations of this work. Vehicle activity along with traffic and pedestrian flows data at six roundabout corridors in Portugal, one in Spain, and one in the United States were collected and extracted. A simulation environment using VISSIM, Vehicle Specific Power, and Surrogate Safety Assessment Model models was used to evaluate traffic operations along the sites. The Fast Non-Dominated Sorting Genetic Algorithm (NSGA-II) was implemented to further search optimal crosswalk locations. The results yielded improvements to both delay and emissions by using site-optimized crosswalks. The findings also revealed that the spacing between intersections widely influenced the optimal crosswalk location along a mid-block section. If the spacing is low (<100 m), the crosswalk location will be approximately in 20%–30% of the spacing length. For spacing values between 140 and 200 m, crosswalks would be located at the midway position. When a specific pollutant criterion was considered, no significant differences were observed among optimal crosswalk data sets. DA - 2017/// PY - 2017/// DO - 10.1080/15568318.2016.1237689 VL - 11 IS - 3 SP - 206-220 SN - 1556-8334 KW - CO2 KW - crosswalks KW - local pollutants KW - multi-objective optimization KW - roundabout corridors KW - spacing ER -