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Iowa State University

2018

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The Power Of Water: Examining Ice Crystal Nucleation’S Impact On Cloud Thermodynamic Properties, Caleb Wood Dec 2018

The Power Of Water: Examining Ice Crystal Nucleation’S Impact On Cloud Thermodynamic Properties, Caleb Wood

Meteorology Senior Theses

Cloud systems demonstrate great influence on Earth’s climate with both radiative and precipitation processes. However, detailed convection can be poorly represented in global climate models. By resolving fine-scale features, like cloud ice crystal nucleation, an improved understanding of the microphysics involved with deep convection will aid to more accurate incorporations of cloud systems into climate models. The purpose of this study is to analyze the differences in certain cloud thermodynamic properties, including mixing ratios and latent heat budgets, as a result of various ice nucleation cases. The Clark-Hall Cloud-Resolving Model (CRM) was initialized with observations from the 1997 Atmospheric ...


Watermelon Cold Stress Testing For Cold Intolerant Seeds, Sarah Ebert Dec 2018

Watermelon Cold Stress Testing For Cold Intolerant Seeds, Sarah Ebert

Creative Components

Watermelon sales and production for Company X is a lucrative business. Watermelon is scientifically known as Citrullus lanatus (Thunb.) Matsum. & Nakai. Watermelon sales for Company X are directed to Georgia, Florida and Spain. These areas make up 80% of Company X’s watermelon seed sales. One major stress factor in these areas is low temperature during watermelon transplant season. Growers interested in selling their produce at the fall harvest markets must transplant the seedlings between February and April. This creative component outlines how watermelon transplants are produced in greenhouses, and what growing conditions are necessary in a field environment. It also outlines temperature trends and fluctuations in the targeted areas of Georgia, Florida and Spain. The cold stress testing has been historically used to help predict seed lot performance in the field in cooler climates and can be used to predict performance in potentially cold climates like Georgia, North Florida and Spain. Company X was interested in developing their own cold stress test to screen seed lots for cold susceptibility and to reduce bad emergence claims for the company. The objective of this project was to develop a test for screening seed lots based on germination and growth in cold temperatures. The road to this test took several steps from prescreening 47 watermelon seed lots to growing watermelon seeds in greenhouses to mimic cold conditions. A difference between primed and unprimed seed lots was observed throughout this experiment. Primed seeds are seed treated with a seed-germination-enhancement treatment. Primed seeds are thus at the same stage of physiological activation and germinate uniformly. Unprimed seeds do not undergo this process; therefore, unprimed seeds germinate at different rates due to different maturity levels and seeds ability to absorb water for imbibition. Ultimately thresholds for mean germination rate in primed seeds were set to identify seed lots that were cold tolerant and help direct the sales of primed seeds. Unprimed watermelon seeds performed differently and required a different testing protocol to help predict poor emergence in cold conditions. Ideally, unprimed seeds would not be sold to potentially colder climates. However, due to ...


Nordhaus–Gaddum Problems For Power Domination, Katherine F. Benson, Daniela Ferrero, Mary Flagg, Veronika Furst, Leslie Hogben, Violeta Vasilevska Dec 2018

Nordhaus–Gaddum Problems For Power Domination, Katherine F. Benson, Daniela Ferrero, Mary Flagg, Veronika Furst, Leslie Hogben, Violeta Vasilevska

Mathematics Publications

A power dominating set of a graph G is a set S of vertices that can observe the entire graph under the rules that (1) the closed neighborhood of every vertex in S is observed, and (2) if a vertex and all but one of its neighbors are observed, then the remaining neighbor is observed; the second rule is applied iteratively. The power domination number of G, denoted by gamma p(G), is the minimum number of vertices in a power dominating set. A Nordhaus-Gaddum problem for power domination is to determine a tight lower or upper bound on gamma ...


Menthol Acts As A Positive Allosteric Modulator On Nematode Levamisole Sensitive Nicotinic Acetylcholine Receptors, Shivani Choudhary, Djordje S. Marjianović, Colin R. Wong, Xiaoyu Zhang, Melanie Abongwa, Joel R. Coats, Saša M. Trailović, Richard J. Martin, Alan P. Robertson Dec 2018

Menthol Acts As A Positive Allosteric Modulator On Nematode Levamisole Sensitive Nicotinic Acetylcholine Receptors, Shivani Choudhary, Djordje S. Marjianović, Colin R. Wong, Xiaoyu Zhang, Melanie Abongwa, Joel R. Coats, Saša M. Trailović, Richard J. Martin, Alan P. Robertson

Entomology Publications

The ongoing and widespread emergence of resistance to the existing anti-nematodal pharmacopeia has made it imperative to develop new anthelminthic agents. Historically, plants have been important sources of therapeutic compounds and offer an alternative to synthetic drugs. Monoterpenoids are phytochemicals that have been shown to produce acute toxic effects in insects and nematodes. Previous studies have shown nicotinic acetylcholine receptors (nAChRs) to be possible targets for naturally occurring plant metabolites such as carvacrol and carveol. In this study we examined the effects of monoterpenoid compounds on a levamisole sensitive nAChR from Oesophagostomum dentatum and a nicotine sensitive nAChR from Ascaris ...


Bounding Average Returns To Schooling Using Unconditional Moment Restrictions, Desire Kedagni, Lixiong Li, Ismael Mourifie Dec 2018

Bounding Average Returns To Schooling Using Unconditional Moment Restrictions, Desire Kedagni, Lixiong Li, Ismael Mourifie

Economics Working Papers

Abstract. In the last 20 years, the bounding approach for the average treatment effect (ATE) has been developing on the theoretical side, however, empirical work has lagged far behind theory in this area. One main reason is that, in practice, traditional bounding methods fall into two extreme cases: (i) On the one hand, the bounds are too wide to be informative and this happens, in general, when the instrumental variable (IV) has little variation; (ii) while on the other hand, the bounds cross, in which case the researcher learns nothing about the parameter of interest other than that the IV ...


Physicochemical Organic Matter Stabilization Across A Restored Grassland Chronosequence, Shane M. Bugeja, Michael J. Castellano Dec 2018

Physicochemical Organic Matter Stabilization Across A Restored Grassland Chronosequence, Shane M. Bugeja, Michael J. Castellano

Agronomy Publications

In reconstructed grasslands, soil organic matter (SOM) is the largest CO2 and reactive N sink but SOM gains after reconstruction rarely achieve precultivation levels. Through a chronosequence of reconstructed grasslands 1 to 21 yr after establishment, we explored which physicochemical mechanisms protect accumulated soil organic C (SOC) and N from mineralization. After 21 yr, total SOC and soil N concentrations increased by 32 and 23%. The SOC concentration was within 5% of a new equilibrium but was 64% of a never‐cultivated remnant. Chemically stabilized C and N pools on free silt and clay surfaces increased with time. Coarse particulate ...


Self-Assembly Of Janus Dumbbell Nanocrystals And Their Enhanced 2 Surface Plasmon Resonance, Fei Liu, Shailja Goyal, Michael Forrester, Tao Ma, Kyle Miller, Yasmeen Mansoorieh, John Henjum, Lin Zhou, Eric W. Cochran, Shan Jiang Dec 2018

Self-Assembly Of Janus Dumbbell Nanocrystals And Their Enhanced 2 Surface Plasmon Resonance, Fei Liu, Shailja Goyal, Michael Forrester, Tao Ma, Kyle Miller, Yasmeen Mansoorieh, John Henjum, Lin Zhou, Eric W. Cochran, Shan Jiang

Ames Laboratory Accepted Manuscripts

Self-assembly is a critical process that can greatly expand the existing structures and lead to new functionality of nanoparticle systems. Multicomponent superstructures self-assembled from nanocrystals have shown promise as multifunctional materials for various applications. Despite recent progress in assembly of homogeneous nanocrystals, synthesis and self-assembly of Janus nanocrystals with contrasting surface chemistry remains a significant challenge. Herein, we designed a novel Janus nanocrystal platform to control the self-assembly of nanoparticles in aqueous solutions by balancing the hydrophobic and hydrophilic moieties. A series of superstructures have been assembled by systematically varying the Janus balance and assembly conditions. Janus Au–Fe3O4 dumbbell ...


Molecular Dynamics Simulation Of Phase Competition In Terbium, H. Song, Mikhail I. Mendelev Dec 2018

Molecular Dynamics Simulation Of Phase Competition In Terbium, H. Song, Mikhail I. Mendelev

Ames Laboratory Accepted Manuscripts

The competition among multiple solid phases determines the final microstructures of a material. Such competition can originate at the very beginning of the solidification process. We report the results of molecular dynamics simulation of the phase competition between the hexagonal close-packed (hcp), face-centered cubic (fcc), and body-centered cubic (bcc) phases during the solidification of pure Tb. We found that the liquid supercooled below the hcp melting temperature has both bcc and hcp/fcc nuclei, but only the bcc nuclei grow such that the liquid always solidifies into the bcc phase, even at temperatures where the hcp phase is more stable ...


Nonequilibrium Pair Breaking In Ba(Fe1-Xcox)(2)As-2 Superconductors: Evidence For Formation Of A Photoinduced Excitonic State, Xu Yang, Liang Luo, M. Mootz, Aaron Patz, Sergey L. Bud’Ko, Paul C. Canfield, I. E. Perakis, Jigang Wang Dec 2018

Nonequilibrium Pair Breaking In Ba(Fe1-Xcox)(2)As-2 Superconductors: Evidence For Formation Of A Photoinduced Excitonic State, Xu Yang, Liang Luo, M. Mootz, Aaron Patz, Sergey L. Bud’Ko, Paul C. Canfield, I. E. Perakis, Jigang Wang

Ames Laboratory Accepted Manuscripts

Ultrafast terahertz (THz) pump-probe spectroscopy reveals an unusual out-of-equilibrium Cooper pair nonlinear dynamics and a nonequilibrium state driven by femtosecond (fs) photoexcitation of superconductivity (SC) in iron pnictides. Following fast SC quench via hot-phonon scattering, a second, abnormally slow (many hundreds of picoseconds), SC quench regime is observed prior to any recovery. Importantly, a nonlinear pump fluence dependence is identified for this remarkably long prebottleneck dynamics that are sensitive to both doping and temperature. Using quantum kinetic modeling we argue that the buildup of excitonic interpocket correlation between electron-hole ( e − h ) quasiparticles (QP) quenches SC after fs photoexcitation leading to ...


A Single Amino Acid Distorts The Fc Γ Receptor Iiib/Cd16b Structure Upon Binding Immunoglobulin G1 And Reduces Affinity Relative To Cd16a, Jacob T. Roberts, Adam W. Barb Dec 2018

A Single Amino Acid Distorts The Fc Γ Receptor Iiib/Cd16b Structure Upon Binding Immunoglobulin G1 And Reduces Affinity Relative To Cd16a, Jacob T. Roberts, Adam W. Barb

Biochemistry, Biophysics and Molecular Biology Publications

Therapeutic mAbs engage Fc γ receptor III (CD16) to elicit a protective cell-mediated response and destroy the target tissue. Newer drugs designed to bind CD16a with increased affinity surprisingly also elicit protective CD16b-mediated responses. However, it is unclear why IgG binds CD16a with more than 10-fold higher affinity than CD16b even though these receptors share more than 97% identity. Here we identified one residue, Gly-129, that contributes to the greater IgG binding affinity of CD16a. The CD16b variant D129G bound IgG1 Fc with 2-fold higher affinity than CD16a and with 90-fold higher affinity than the WT. Conversely, the binding affinity ...


Temporal Dynamics Of Bacterial Communities In Soil And Leachate Water After Swine Manure Application, Elizabeth L. Rieke, Michelle L. Soupir, Thomas B. Moorman, Fan Yang, Adina C. Howe Dec 2018

Temporal Dynamics Of Bacterial Communities In Soil And Leachate Water After Swine Manure Application, Elizabeth L. Rieke, Michelle L. Soupir, Thomas B. Moorman, Fan Yang, Adina C. Howe

Agricultural and Biosystems Engineering Publications

Application of swine manure to agricultural land allows recycling of plant nutrients, but excess nitrate, phosphorus and fecal bacteria impact surface and drainage water quality. While agronomic and water quality impacts are well studied, little is known about the impact of swine manure slurry on soil microbial communities. We applied swine manure to intact soil columns collected from plots maintained under chisel plow or no-till with corn and soybean rotation. Targeted 16S-rRNA gene sequencing was used to characterize and to identify shifts in bacterial communities in soil over 108 days after swine manure application. In addition, six simulated rainfalls were ...


Imaging Stress And Magnetism At High Pressures Using A Nanoscale Quantum Sensor, S. Hsieh, P. Bhattacharyya, C. Zu, T. Mittiga, T. J. Smart, F. Machado, B. Kobrin, T. O. Hohn, N. Z. Rui, Mehdi Kamrani, S. Chatterjee, S. Choi, M. Zaletel, V. V. Struzhkin, J. E. Moore, Valery I. Levitas, R. Jeanloz, N. Y. Yao Dec 2018

Imaging Stress And Magnetism At High Pressures Using A Nanoscale Quantum Sensor, S. Hsieh, P. Bhattacharyya, C. Zu, T. Mittiga, T. J. Smart, F. Machado, B. Kobrin, T. O. Hohn, N. Z. Rui, Mehdi Kamrani, S. Chatterjee, S. Choi, M. Zaletel, V. V. Struzhkin, J. E. Moore, Valery I. Levitas, R. Jeanloz, N. Y. Yao

Aerospace Engineering Publications

Pressure alters the physical, chemical and electronic properties of matter. The development of the diamond anvil cell (DAC) enables tabletop experiments to investigate a diverse landscape of high-pressure phenomena ranging from the properties of planetary interiors to transitions between quantum mechanical phases. In this work, we introduce and utilize a novel nanoscale sensing platform, which integrates nitrogen-vacancy (NV) color centers directly into the culet (tip) of diamond anvils. We demonstrate the versatility of this platform by performing diffraction-limited imaging (~600 nm) of both stress fields and magnetism, up to pressures ~30 GPa and for temperatures ranging from 25-340 K. For ...


Interconverting Lanthanum Hydride And Borohydride Catalysts For C=O Reduction And C−O Bond Cleavage, Smita Patnaik, Aaron D. Sadow Dec 2018

Interconverting Lanthanum Hydride And Borohydride Catalysts For C=O Reduction And C−O Bond Cleavage, Smita Patnaik, Aaron D. Sadow

Ames Laboratory Accepted Manuscripts

The high catalytic reactivity of homoleptic tris(alkyl) lanthanum La{C(SiHMe2)3}3 is highlighted by C−O bond cleavage in the hydroboration of esters and epoxides at room temperature. The catalytic hydroboration tolerates functionality typically susceptible to insertion, reduction, or cleavage reactions. Turnover numbers (TON) up to 10 000 are observed for aliphatic esters. Lanthanum hydrides, generated by reactions with pinacolborane, are competent for reduction of ketones but are inert toward esters. Instead, catalytic reduction of esters requires activation of the lanthanum hydride by pinacolborane.


Do Masked-Face Lineups Facilitate Eyewitness Identification Of A Masked Individual?, Krista D. Manley, Jason C.K. Chan, Gary L. Wells Dec 2018

Do Masked-Face Lineups Facilitate Eyewitness Identification Of A Masked Individual?, Krista D. Manley, Jason C.K. Chan, Gary L. Wells

Psychology Publications

Perpetrators often wear disguises like ski masks to hinder subsequent identification by witnesses or law enforcement officials. In criminal cases involving a masked perpetrator, the decision of whether and how to administer a lineup often rests on the investigating officer. To date, no evidence-based recommendations are available for eyewitness identifications of a masked perpetrator. In 4 experiments, we examined lineup identification performance depending on variations in both encoding (studying a full face vs. a partial/masked face) and retrieval conditions (identifying a target from a full-face lineup vs. a partial/masked-face lineup). In addition, we manipulated whether the target was ...


Individual And Collective Identification In Contemporary Forensics, Simon Cole Dec 2018

Individual And Collective Identification In Contemporary Forensics, Simon Cole

CSAFE Publications

It has long been understood that individual and collective identification are inexorably intertwined. This convergence is not limited to genetics. This paper discusses the convergence of individual and collective identification in a comparative analysis of three other forensic areas: fingerprint analysis, microscopic hair comparison, and microbiome forensics. In all three case studies, we see purportedly individualizing technologies reverting, in a sense, to collective identification. Presumably, this has much to do with the perceived utility of collective identification. When knowing precisely who is the donor of a trace is not possible, or not useful, then knowing that the donor is ‘white ...


Competition, Proprietary Costs Of Financial Reporting, And Financial Statement Comparability, Michael J. Imhof, Scott E. Seavey, Olena Watanabe Dec 2018

Competition, Proprietary Costs Of Financial Reporting, And Financial Statement Comparability, Michael J. Imhof, Scott E. Seavey, Olena Watanabe

Accounting Publications

Competitors often pay close attention to rivals’ financial reports. For firms with high levels of proprietary information, competition may increase the costs of public disclosure. Theory suggests that such costs, which we refer to as the proprietary costs of financial reporting, may lead to strategic financial reporting. We find that financial statement comparability is decreasing in the proprietary costs of financial reporting. Our results are robust to the use of alternative measures of comparability and alternative measures of proprietary costs of financial reporting. In addition, theory suggests that financial reports will contain stronger signals of managers’ private information when information ...


Agricultural Practices For Growing Kenaf (Hibiscus Cannabinus L.) In Iowa: I. Morphology, Stem, And Fiber Yield, Marie Bourguignon, Kenneth J. Moore, Andrew W. Lenssen, Brian S. Baldwin Dec 2018

Agricultural Practices For Growing Kenaf (Hibiscus Cannabinus L.) In Iowa: I. Morphology, Stem, And Fiber Yield, Marie Bourguignon, Kenneth J. Moore, Andrew W. Lenssen, Brian S. Baldwin

Agronomy Publications

Kenaf (Hibiscus cannabinus L.) is a promising biorenewable resource for producing natural fibers but few studies have investigated the crop when grown in cooler climates, such as the American Midwest. The objectives of this study were to: 1) determine the agricultural practices (row spacing, seed, and N rates) leading to optimal kenaf dry matter (DM) stem and fiber yield in ‘Tainung 2’ and ‘Whitten’; 2) evaluate stem height, basal diameter, and leaf area index (LAI) over the growing season; and 3) assess the influence of management practices on fiber (bast and core lignocellulose) composition, and carbon (C), N, and total ...


Impacts Of Shallow Lake Restoration On Vegetation And Breeding Birds In Iowa, Rachel A. Vanausdall, Stephen J. Dinsmore Dec 2018

Impacts Of Shallow Lake Restoration On Vegetation And Breeding Birds In Iowa, Rachel A. Vanausdall, Stephen J. Dinsmore

Natural Resource Ecology and Management Publications

The Shallow Lakes Restoration Project aims to restore eutrophic shallow lakes throughout the Iowa Prairie Pothole Region (PPR). We compared the vegetation taxa richness and frequency of taxa in three vegetation groups surveyed in 2016 and 2017 across non-restored sites, younger restorations, and older restorations. We also assessed the impact of these groups on numbers of breeding marsh birds. Restored wetlands had between 2.7 (95% CI 2.3, 3.2) and 4.7 (95% CI 3.9, 5.5) more species than non-restored sites among the three vegetation groups. Typha sp. was the most abundant emergent species. Lemna minor ...


Graphene Plasmonics: A Platform For 2d Optics, Yuancheng Fan, Nian-Hai Shen, Fuli Zhang, Qian Zhao, Hongjing Wu, Quanhong Fu, Zeyong Wei, Hongqiang Li, Costas M. Soukoulis Dec 2018

Graphene Plasmonics: A Platform For 2d Optics, Yuancheng Fan, Nian-Hai Shen, Fuli Zhang, Qian Zhao, Hongjing Wu, Quanhong Fu, Zeyong Wei, Hongqiang Li, Costas M. Soukoulis

Ames Laboratory Accepted Manuscripts

2D optics is gradually emerging as a frontier in modern optics. Plasmons in graphene provide a prominent platform for 2D optics in which the light is squeezed into atomic scale. This report highlights some recent progresses in graphene plasmons toward the 2D optics. The launch, observation, and advanced manipulation of propagating graphene plasmons for 2D optical circuits are described. Representative achievements associated with graphene metasurfaces, challenges, recent progresses like photoexcited graphene metasurfaces, and the transformation optics linking 2D to bulk optics with singularity are investigated.


Pressure-Induced Multiple Phase Transformations Of The Babi3 Superconductor, Li Xiang, Raquel A. Ribeiro, Udhara S. Kaluarachchi, Elena Gati, Manh Cuong Nguyen, Cai-Zhuang Wang, Kai-Ming Ho, Sergey L. Bud’Ko, Paul C. Canfield Dec 2018

Pressure-Induced Multiple Phase Transformations Of The Babi3 Superconductor, Li Xiang, Raquel A. Ribeiro, Udhara S. Kaluarachchi, Elena Gati, Manh Cuong Nguyen, Cai-Zhuang Wang, Kai-Ming Ho, Sergey L. Bud’Ko, Paul C. Canfield

Ames Laboratory Accepted Manuscripts

Measurements of temperature-dependent resistance and magnetization under hydrostatic pressures up to 2.13 GPa are reported for single-crystalline, superconducting BaBi3. A temperature-pressure phase diagram is determined and the results suggest three different superconducting phases α, β, and γ in the studied pressure range. We further show that the occurrence of the three superconducting phases is intuitively linked to phase transitions at higher temperature, which are likely first order and structural in nature. With the α phase being the ambient-pressure tetragonal structure (P4/mmm), our first-principles calculations suggest the β phase has a cubic structure (Pm−3m) and the γ phase ...


Catchment-Scale Phosphorus Export Through Surface And Drainage Pathways, Conrad E. Brendel, Michelle L. Soupir, Leigh Ann M. Long, Matthew J. Helmers, Charles D. Ikenberry, Amy L. Kaleita Dec 2018

Catchment-Scale Phosphorus Export Through Surface And Drainage Pathways, Conrad E. Brendel, Michelle L. Soupir, Leigh Ann M. Long, Matthew J. Helmers, Charles D. Ikenberry, Amy L. Kaleita

Agricultural and Biosystems Engineering Publications

The site-specific nature of P fate and transport in drained areas exemplifies the need for additional data to guide implementation of conservation practices at the catchment scale. Total P (TP), dissolved reactive P (DRP), and total suspended solids (TSS) were monitored at five sites—two streams, two tile outlets, and a grassed waterway—in three agricultural subwatersheds (221.2–822.5 ha) draining to Black Hawk Lake in western Iowa. Median TP concentrations ranged from 0.034 to 1.490 and 0.008 to 0.055 mg P L−1 for event and baseflow samples, respectively. The majority of P ...


Evaluation Of Confidence Using Motivational Interviewing Skills Before And After In-Person Training Workshop, Jeni E. Lansing, Kathryn J. Deshaw, Maria Perez, Gregory Welk, Laura D. Ellingson Dec 2018

Evaluation Of Confidence Using Motivational Interviewing Skills Before And After In-Person Training Workshop, Jeni E. Lansing, Kathryn J. Deshaw, Maria Perez, Gregory Welk, Laura D. Ellingson

CIRTL Reports

Motivational interviewing (MI) is a skill used to help individuals make positive behavior changes and may be beneficial for those who work with undergraduate students. A new training, comprised of online content followed by an in-person workshop, was created and offered to staff members working directly with students at Iowa State University. The aim of this study was to evaluate confidence for using MI-related components pre and post an in-person workshop. To do so, participants completed a survey regarding their confidence in using MI-related skills before and after the workshop. From the survey results, a paired t-test was conducted to ...


Phage Based Electrochemical Detection Of Escherichia Coli In Drinking Water Using Affinity Reporter Probes, Danhui Wang, Troy Hinkley, Juhong Chen, Joey Talbert, Sam R. Nugen Dec 2018

Phage Based Electrochemical Detection Of Escherichia Coli In Drinking Water Using Affinity Reporter Probes, Danhui Wang, Troy Hinkley, Juhong Chen, Joey Talbert, Sam R. Nugen

Food Science and Human Nutrition Publications

The monitoring of drinking water for indicators of fecal contamination is crucial for ensuring a safe supply. In this study, a novel electrochemical method was developed for the rapid and sensitive detection of Escherichia coli (E. coli) in drinking water. This strategy is based on the use of engineered bacteriophages (phages) to separate and concentrate target E. coli when conjugated with magnetic beads, and to facilitate the detection by expressing gold binding peptides fused alkaline phosphatase (GBPs-ALP). The fusion protein GBPs-ALP has both the enzymatic activity and the ability to directly bind onto a gold surface. This binding-peptide mediated immobilization ...


The Fight-Or-Flight Response To The Joneses And Income Inequality, Richard C. Barnett, Joydeep Bhattacharya, Helle Bunzel Dec 2018

The Fight-Or-Flight Response To The Joneses And Income Inequality, Richard C. Barnett, Joydeep Bhattacharya, Helle Bunzel

Economics Working Papers

This paper studies the fight-or-flight ambivalence people show
towards the success of the proverbial Joneses. If an agent cares about
leisure and his consumption relative to a benchmark set by the Joneses, his
preferences display the keeping-up-with-the-Joneses (KUJ) property if an
increase in the benchmark urges him to substitute away from leisure into
work, allowing him to finance more consumption; the opposite is labeled
running-away-from-the-Joneses (RAJ). The long literature, thus far, finds a)
if any agent's behavior displays KUJ (or RAJ), everyone's will, or b) if an
agent displays KUJ (or RAJ) in one portion of the consumption ...


Forensic Statistics And The Assessment Of Probative Value, Hal Stern Dec 2018

Forensic Statistics And The Assessment Of Probative Value, Hal Stern

CSAFE Presentations and Proceedings

No abstract provided.


Effects Of Litter Floor Access And Inclusion Of Experienced Hens In Aviary Housing On Floor Eggs, Litter Condition, Air Quality, And Hen Welfare, Jofran L. Oliveira, Hongwei Xin, Lilong Chai, Suzanne T. Millman Dec 2018

Effects Of Litter Floor Access And Inclusion Of Experienced Hens In Aviary Housing On Floor Eggs, Litter Condition, Air Quality, And Hen Welfare, Jofran L. Oliveira, Hongwei Xin, Lilong Chai, Suzanne T. Millman

Agricultural and Biosystems Engineering Publications

To better understand how relevant intensive systems’ characteristics simultaneously affect the performance and welfare of broiler chickens, a meta-analysis of recent literature was carried out. The study determined the effects of gender, genetics, experimental initial age (EIA, d), stocking density (SD; kg/m2), group size (GS; n), bedding material (yes/no), duration of photoperiod (DP; h), divided scotoperiod (yes/no), feeding phases (1/2/3/>3), environmental control (EC; yes/no), environmental enrichment (yes/no), use of vaccines and other medications (yes/no), experimental duration (d), and relevant 2-way interactions on average daily gain (g/d), average daily feed intake ...


Variable Input Observer For Nonstationary High-Rate Dynamic Systems, Jonathan Hong, Simon Laflamme, Liang Cao, Jacob Dodson, Bryan Joyce Dec 2018

Variable Input Observer For Nonstationary High-Rate Dynamic Systems, Jonathan Hong, Simon Laflamme, Liang Cao, Jacob Dodson, Bryan Joyce

Civil, Construction and Environmental Engineering Publications

Engineering systems experiencing events of amplitudes higher than 100 gn for a duration under 100 ms, here termed high-rate dynamics, can undergo rapid damaging effects. If the structural health of such systems could be accurately estimated in a timely manner, preventative measures could be employed to minimize adverse effects. For complex high-rate problems, adaptive observers have shown promise due to their capability to deal with nonstationary, noisy, and uncertain systems. However, adaptive observers have slow convergence rates, which impede their applicability to the high-rate problems. To improve on the convergence rate, we propose a variable input space concept for ...


Inferring Processes Of Coevolutionary Diversification In A Community Of Panamanian Strangler Figs And Associated Pollinating Wasps, Jordan D. Satler, Edward Allen Herre, K. Charlotte Jandér, Deren A. R. Eaton, Carlos A. Machado, Tracy A. Heath, John D. Nason Dec 2018

Inferring Processes Of Coevolutionary Diversification In A Community Of Panamanian Strangler Figs And Associated Pollinating Wasps, Jordan D. Satler, Edward Allen Herre, K. Charlotte Jandér, Deren A. R. Eaton, Carlos A. Machado, Tracy A. Heath, John D. Nason

Ecology, Evolution and Organismal Biology Publications

The fig and pollinator wasp obligate mutualism is diverse (~750 described species), ecologically important, and ancient (~80-90 Ma), providing model systems for generating and testing many questions in evolution and ecology. Once thought to be a prime example of strict one-to-one cospeciation, current thinking suggests that genera of pollinator wasps coevolve with corresponding subsections of figs, but the degree to which cospeciation or other processes contributes to the association at finer scales is unclear. Here we use genome-wide sequence data from a community of Panamanian strangler figs (Ficus subgenus Urostigma, section Americana) and associated fig wasp pollinators (Pegoscapus spp.) to ...


Performance Investigation Of A High-Field Active Magnetic Regenerator, Reed Teyber, Jamelyn Holladay, Kerry Meinhardt, Evgueni Polikarpov, Edwin Thomsen, Jun Cui, Andrew Rowe, John Barclay Dec 2018

Performance Investigation Of A High-Field Active Magnetic Regenerator, Reed Teyber, Jamelyn Holladay, Kerry Meinhardt, Evgueni Polikarpov, Edwin Thomsen, Jun Cui, Andrew Rowe, John Barclay

Ames Laboratory Accepted Manuscripts

Regenerative magnetic cycles are of interest for small-scale, high-efficiency cryogen liquefiers; however, commercially relevant performance has yet to be demonstrated. To develop improved engineering prototypes, an efficient modeling tool is required to screen the multi-parameter design space. In this work, we describe an active magnetic regenerative refrigerator prototype using a high-field superconducting magnet that produces a 100 K temperature span. Using the experimental data, a semi-analytic AMR element model is validated and enhanced system performance is simulated using liquid propane as a heat transfer fluid. In addition, the regenerator composition and fluid flow are simultaneously optimized using a differential evolution ...


Iowa State Daily (December 7, 2018), Iowa State Daily Dec 2018

Iowa State Daily (December 7, 2018), Iowa State Daily

Iowa State Daily, December 2018

This issue includes articles regarding, Ames Tenant Union, 4-H, and combating suicide rates.