Digital Commons Network^™

Mapping Forest Health Using Spectral And Textural Information Extracted From Spot-5 Satellite Images, Jinghui Meng, Shiming Li, Wei Wang, Qingwang Liu, Shiqin Xie, Wu Ma

Faculty & Staff Scholarship

Forest health is an important variable that we need to monitor for forest management decision making. However, forest health is difficult to assess and monitor based merely on forest field surveys. In the present study, we first derived a comprehensive forest health indicator using 15 forest stand attributes extracted from forest inventory plots. Second, Pearson’s correlation analysis was performed to investigate the relationship between the forest health indicator and the spectral and textural measures extracted from SPOT-5 images. Third, all-subsets regression was performed to build the predictive model by including the statistically significant image-derived measures as independent variables. Finally, the …

Nucleophile Promoted Gold Redox Catalysis With Diazonium: C-Br, C-S And C-P Bond Formation Through Catalytic Sandmeyer Coupling, Haihui Peng, Rong Cai, Chang Xu, Hao Chen, Xiaodong Shi

Faculty & Staff Scholarship

Gold-catalyzed C-heteroatom (C–X) coupling reactions are evaluated without using sacrificial oxidants. Vital to the success of this methodology is the nucleophile-assisted activation of aryldiazonium salts, which could be an effective oxidant for converting Au(I) to Au(III) even without the addition of an assisting ligand or photocatalyst. By accelerating the reaction kinetics to outcompete C–C homo-coupling or diazonium dediazoniation, gold-catalyzed Sandmeyer reactions were achieved with different nucleophiles, forming C–Br, C–S and C–P bonds in high yields and selectivities.

Recent Afforestation In The Iowa River And Vorskla River Basins: A Comparative Trends Analysis, Yury Chendev, Jason Hubbart, Edgar Terekhin, Anthony Lupo, Tom Sauer, C. Burras

Faculty & Staff Scholarship

Afforestation trends were compared between two continentally-distinct, yet similar ecoregions to characterize similarities or differences in forest advancement due to natural and anthropogenic forcings. Temporal changes in forest cover were analyzed using high resolution aerial and satellite photographs for Southeast Iowa, USA, and satellite photographs for the western Belgorod Oblast, Russia. An increase in forested area was shown to occur over a 44-year period from 1970–2014 in Iowa where afforestation was reflected by the aggregation of smaller forest units. In the Belgorod region the opposite occurred in that there was an increase in the number of smaller forested units. The …

Automated Classification Of Vowel Category And Speaker Type In The High-Frequency Spectrum, Jeremy J. Donai, Saeid Motiian, Gianfranco Doretto

Faculty & Staff Scholarship

The high-frequency region of vowel signals (above the third formant or F3) has received little research attention. Recent evidence, however, has documented the perceptual utility of high-frequency information in the speech signal above the traditional frequency bandwidth known to contain important cues for speech and speaker recognition. The purpose of this study was to determine if high-pass filtered vowels could be separated by vowel category and speaker type in a supervised learning framework. Mel frequency cepstral coefficients (MFCCs) were extracted from productions of six vowel categories produced by two male, two female, and two child speakers. Results revealed that the …

Contemporary Issues In Left Realism, Walter S. Dekeseredy

Faculty & Staff Scholarship

Using Roger Matthews’ (2014) book Realist Criminology as a launching pad, this article points to some timely issues that warrant attention from Left Realism. Special attention is devoted to rebuilding the Left realist movement and to some new empirical directions, such as critical studies of policing, adult Internet pornography, and rural women and girls in conflict with the law.

Nucleophile Promoted Gold Redox Catalysis With Diazonium: Cbr, C-S And C-P Bond Formation Through Catalytic Sandmeyer Coupling, Haihui Peng, Rong Cai, Chang Xu, Hao Chen, Xiaodong Shi

Faculty & Staff Scholarship

Gold-catalyzed C-heteroatom (C-X) coupling reactions are evaluated without using sacrificial oxidants. Vital to the success of this methodology is the nucleophile-assisted activation of aryldiazonium salts, which could be an effective oxidant to convert Au(I) to Au(III) even without the addition of assisting ligand or photocatalyst. By accelerating reaction kinetics to outcompete C-C homo-coupling or diazonium dediazoniation, gold-catalyzed Sandmeyer reactions were achieved with different nucleophiles, forming C-Br, C-S and C-P bonds in high yields and selectivity.

Microtubule Modification Influences Cellular Response To Amyloid-Β Exposure, Nicole Shamitko-Klingensmith, Jonathan W. Boyd, Justin Legleiter

Faculty & Staff Scholarship

During the normal aging process, cytoskeletal changes such as a reduction in density or disruption of cytoskeletal components occur that can affect neuronal function. As aging is the biggest risk factor for Alzheimer's disease (AD), this study sought to determine how microtubule (MT) modification influences cellular response upon exposure to β-amyloid1-42 (Aβ1-42), which is implicated in AD. The MT networks of hypothalamic GT1-7 neurons were modified by common disrupting or stabilizing drugs, and then the physical and mechanical properties of the modified neurons were determined. The MT modified neurons were then exposed to Aβ1-42 and the ability of the neurons …

Northern Long-Eared Bat Day-Roosting And Prescribed Fire In The Central Appalachians, Usa, W. Mark Ford, Alexander Silvis, Joshua B. Johnson, John W. Edwards, Milu Karp

Faculty & Staff Scholarship

The northern long-eared bat (Myotis septentrionalis Trovessart) is a cavity-roosting species that forages in cluttered upland and riparian forests throughout the oak-dominated Appalachian and Central Hardwoods regions. Common prior to white-nose syndrome, the population of this bat species has declined to functional extirpation in some regions in the Northeast and Mid-Atlantic, including portions of the central Appalachians. Our long-term research in the central Appalachians has shown that maternity colonies of this species form non-random assorting networks in patches of suitable trees that result from longand short-term forest disturbance processes, and that roost loss can occur with these disturbances. Following two …

"What Made Me Continue Was Stubbornness": Perspectives Of Swedish Women At The Beginning Of Their Academic Career In Geography, Martina Angela Caretta, Natasha Alexander Webster

Faculty & Staff Scholarship

The rise of neoliberalism is creating inequalities for women as they balance their private lives and career trajectories. Geography as a middle sized discipline bridging the social and physical sciences offers insights into the ways neoliberal policies are felt by early career women (ECW). Using a life course model, this study presents the results of a workshop which sought to explore the ways in which women geographers, in Sweden, perceive and experience obstacles in their career advancement and which coping strategies they put in place to overcome those. The results show the blurring of the ECW ́s work and private …

Effect Of Spatial Inhomogeneities On The Membrane Surface On Receptor Dimerization And Signal Initiation, Romica Kerketta, Adam M. Halasz, Mara P. Steinkamp, Bridget S. Wilson, Jeremy S. Edwards

Faculty & Staff Scholarship

Important signal transduction pathways originate on the plasma membrane, where microdomains may transiently entrap diffusing receptors. This results in a non-random distribution of receptors even in the resting state, which can be visualized as “clusters” by high resolution imaging methods. Here, we explore how spatial in-homogeneities in the plasma membrane might influence the dimerization and phosphorylation status of ErbB2 and ErbB3, two receptor tyrosine kinases that preferentially heterodimerize and are often co-expressed in cancer. This theoretical study is based upon spatial stochastic simulations of the two-dimensional membrane landscape, where variables include differential distributions and overlap of transient confinement zones (“domains”) …

Career Expectancy Of Physicians Active In Patient Care: Evidence From Mississippi, Jamie Boydstun, Jeralynn S. Cossman

Faculty & Staff Scholarship

Introduction: Physician shortages in the USA, an issue that has been particularly challenging in Mississippi, have been a concern among health scholars and policy makers for several decades. Physician shortages hinder residents from easily obtaining routine care, potentially magnifying health disparities. This study examines physician career life expectancy, or how long physicians typically practice, in Mississippi. Methods: Data on Mississippi’s physician population actively involved between 2007 and 2011 were obtained from the Mississippi State Board of Medical Licensure. Abridged career life tables were constructed for all Mississippi physicians and population subgroups based on practice specialty, gender, race, urban–rural practice, and …

Convergence Of Exterior Solutions To Radial Cauchy Solutions For ∂ 2 T U − C 2∆U = 0, Helge Kristian Jenssen, Charis Tsikkou

Faculty & Staff Scholarship

Consider the Cauchy problem for the 3-D linear wave equation ∂ 2 t U − c 2∆U = 0 with radial initial data U(0, x) = Φ(x) = ϕ(|x|), Ut(0, x) = Ψ(x) = ψ(|x|). A standard result states that U belongs to C([0, T]; Hs (R3 )) whenever (Φ, Ψ) ∈ Hs × Hs−1 (R3 ). In this article we are interested in the question of how U can be realized as a limit of solutions to initial-boundary value problems on the exterior of vanishing balls Bε about the origin. We note that, as the solutions we compare are …

A Search For Rotating Radio Transients And Fast Radio Bursts In The Parkes High-Latitude Pulsar Survey, A. Rane, D. R. Lorimer, S. D. Bates, N. Mcmann, M. A. Mclaughlin, K. Rajwade

Faculty & Staff Scholarship

Discoveries of rotating radio transients and fast radio bursts (FRBs) in pulsar surveys suggest that further transient sources await discovery in archival data sets. Here we report on a single-pulse search for dispersed radio bursts over a wide range of Galactic latitudes ($|b| < 60^{\circ}$) in data previously searched for periodic sources by Burgay et al. We detected 20 of the 42 pulsars reported by Burgay et al. and one radio transient. No FRBs were discovered in this survey. Taking into account this null result, along with other recent surveys at Parkes, and correcting for detection sensitivity based on the search algorithms used in the analyses, we find that the all-sky FRB event rate for sources with peak fluxes $> 0.1$ Jy to be ${\cal R} = 3.3^{+5.0}_{-2.5} \times 10^3$ FRBs day$^{-1}$ sky$^{-1}$, where the uncertainties represent a $99\%$ confidence interval. While this rate is several times lower than inferred from previous studies, it is consistent with all systematic FRB searches at Parkes to date and does not require the need to postulate a dearth of FRBs …

Cardiac Rehabilitation Using The Family-Centered Empowerment Model Versus Home-Based Cardiac Rehabilitation In Patients With Myocardial Infarction: A Randomised Controlled Trial, Amir Vahedian-Azimi, Andrew C. Miller, Mohammadreza Hajiesmaieli, Mari Kangasniemi, Fatemah Alhani, Hosseinali Jelvehmoghaddam, Mohammad Fathi, Behrooz Farzanegan, Seyed H. Ardehali, Sevak Hatamian, Mehdi Gahremani, Seyed M. M. Mosavinasab, Zohreh Rostami, Seyed J. Madani, Morteza Izadi

Faculty & Staff Scholarship

Objective To determine if a hybrid cardiac rehabilitation (CR) programme using the Family-Centered Empowerment Model (FCEM) as compared with standard CR will improve patient quality of life, perceived stress and state anxiety of patients with myocardial infarction (MI).

Methods We conducted a randomised controlled trial in which patients received either standard home CR or CR using the FCEM strategy. Patient empowerment was measured with FCEM questionnaires preintervention and postintervention for a total of 9 assessments. Quality of life, perceived stress, and state and trait anxiety were assessed using the 36-Item Short Form Health Survey (SF-36), the 14-item Perceived Stress, and …

Synergistic Effects Of Climate Change And Grazing On Net Primary Production Of Mongolian Grasslands, Shree R. S. Dangal, Hanqin Tian, Chaoqun Lu, Shufen Pan, Neil Pederson, Amy Hessl

Faculty & Staff Scholarship

In arid and semi-arid regions, grassland degradation has become a major environmental and economic problem, but little information is available on the response of grassland productivity to both climate change and grazing intensity. By developing a grazing module in a process-based ecosystem model, the dynamic land ecosystem model (DLEM), we explore the roles of climate change, elevated CO2, and varying grazing intensities in affecting aboveground net primary productivity (ANPP) across different grassland sites in Mongolia. Our results show that both growing season precipitation totals and average temperature exert important controls on annual ANPP across six sites over a precipitation gradient, …

Topological Crystalline Insulator In A New Bi Semiconducting Phase, F. Munoz, M. G. Vergniory, T. Rauch, J. Henk, E. V. Chulkov, I. Mertig, S. Botti, M. A. L. Marques, A. H. Romero

Faculty & Staff Scholarship

Topological crystalline insulators are a type of topological insulators whose topological surface states are protected by a crystal symmetry, thus the surface gap can be tuned by applying strain or an electric field. In this paper we predict by means of ab initio calculations a new phase of Bi which is a topological crystalline insulator characterized by a mirror Chern number nM =−2, but not a Z2 strong topological insulator. This system presents an exceptional property: at the (001) surface its Dirac cones are pinned at the surface high-symmetry points. As a consequence they are also protected by time-reversal symmetry …

Experimental Observation And Computational Analysis Of Striations In Electronegative Capacitively Coupled Radio-Frequency Plasmas, Yong-Xin Liu, Edmund Schüngel, Ihor Korolov, Zoltán Donkó, You-Nian Wang, Julian Schulze

Faculty & Staff Scholarship

Self-organized spatial structures in the light emission from the ion-ion capacitive rf plasma of a strongly electronegative gas (CF_{4}) are observed experimentally for the first time. Their formation is analyzed and understood based on particle-based kinetic simulations. These "striations" are found to be generated by the resonance between the driving radio frequency and the eigenfrequency of the ion-ion plasma (derived from an analytical model) that establishes a modulation of the electric field, the ion densities, as well as the energy gain and loss processes of electrons in the plasma. The growth of the instability is followed by the numerical simulations.

Light Interception By Pasture Canopies As Affected By Height And Botanical Composition, Edward Barrow Rayburn

Faculty & Staff Scholarship

No abstract provided.

White Paper On Mentoring Research And Best Practices, Elina Erzikova, Diana Martinelli

Faculty & Staff Scholarship

Sponsored by the Plank Center for Leadership in Public Relations, this white paper draws upon mentorship research literature and summarizes 12 key insights and eight best practices gleaned from that work. Key insights include: mentoring as a bi-directional and multiple relationship process, mentors as co-learners, long-term benefits for protégés, mentorship’s long-term value, the roles of involvement and similarity, the power of both formal and informal mentorship, mentorship as leadership development, and the promise of e-mentoring. The paper also includes sections on mentoring college students and ways to evaluate mentoring programs.

Seeing The Forest Through The Trees: Considering Roost-Site Selection At Multiple Spatial Scales, David S. Jachowski, Christopher T. Rota, Christopher A. Dobony, W. Mark Ford, John W. Edwards, Danilo Russo

Faculty & Staff Scholarship

Conservation of bat species is one of the most daunting wildlife conservation challenges in North America, requiring detailed knowledge about their ecology to guide conservation efforts. Outside of the hibernating season, bats in temperate forest environments spend their diurnal time in day-roosts. In addition to simple shelter, summer roost availability is as critical as maternity sites and maintaining social group contact. To date, a major focus of bat conservation has concentrated on conserving individual roost sites, with comparatively less focus on the role that broader habitat conditions contribute towards roost-site selection. We evaluated roost-site selection by a northern population of …

Two-Photon Lif On The Hit-Si3 Experiment: Absolute Density And Temperature Measurements Of Deuterium Neutrals, Drew Elliott, Derek Sutherland, Umair Siddiqui, Earl Scime, Chris Everson, Kyle Morgan, Aaron Hossack, Brian Nelson, Tom Jarboe

Faculty & Staff Scholarship

Presented XXXXX; received XXXXX; accepted XXXXX; published online XXXXX) (Dates appearing here are provided by the Editorial Office) Two-photon laser-induced fluorescence (TALIF) measurements were performed on the helicity injected torus (HIT-SI3) device to determine the density and temperature of the background neutral deuterium population, and to demonstrate the diagnostic's feasibility for use on short pulse fusion experiments. Measurements were taken in 2 ms long pulsed plasmas after the inductive helicity injectors were turned off. Attempts to measure neutrals during the main phase of the plasma were unsuccessful, likely due to the density of neutrals being below the detection threshold of …

Echo Behavior In Large Populations Of Chemical Oscillators, Tianran Chen, Mark R. Tinsley, Edward Ott, Kenneth Showalter

Faculty & Staff Scholarship

Experimental and theoretical studies are reported, for the first time, on the observation and characterization of echo phenomena in oscillatory chemical reactions. Populations of uncoupled and coupled oscillators are globally perturbed. The macroscopic response to this perturbation dies out with time: At some time τ after the perturbation (where τ is long enough that the response has died out), the system is again perturbed, and the initial response to this second perturbation again dies out. Echoes can potentially appear as responses that arise at 2τ,3τ,... after the first perturbation. The phase-resetting character of the chemical oscillators allows a detailed analysis, …

Scalable Methods For Monitoring Limited Access Roadways Using Crowd-Sourced Probe Data, Howell Li, Stephen M. Remias, Aaron Taylor, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Real-Time Probe Data Dashboards For Interstate Performance Monitoring During Winter Weather And Incidents, Margaret Mcnamara, Howell Li, Stephen Remias, Deborah Horton, Ed Cox, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Scaling Detailed High-Resolution Data Split Performance Measures To Statewide System Level Management, Howell Li, Christopher M. Day, James R. Sturdevant, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Use Of High Resolution Signal Controller Data To Identify Red Light Running, Steven M. Lavrenz, Christopher M. Day, Jay Grossman, Rick Freije, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Rate Of Pedestrian Signal Phase Actuation As A Proxy Measurement Of Pedestrian Demand, Christopher M. Day, Hiromal Premachandra, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Extending Link Pivot Offset Optimization To Arterials With Single Controller Diverging Diamond Interchange, Christopher M. Day, Steven M. Lavrenz, Amanda L. Stevens, R Eric Miller, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

Opportunities For Detector-Free Signal Offset Optimization With Limited Connected Vehicle Market Penetration: A Proof-Of-Concept Study, Christopher M. Day, Darcy M. Bullock

Lyles School of Civil Engineering Faculty Publications

No abstract provided.

The Assessment Of Water Use And Reuse Through Reported Data: A Us Case Study, Maria J. Wiener, Chad T. Jafvert, Loring F. Nies

Lyles School of Civil Engineering Faculty Publications

Increasing demands for freshwater make it necessary to find innovative ways to extend the life of our water resources, and to manage them in a sustainable way. Indirect water reuse plays a role in meeting freshwater demands but there is limited documentation of it. There is a need to analyze its current status for water resources planning and conservation, and for understanding how it potentially impacts human health. However, the fact that data are archived in discrete uncoordinated databases by different state and federal entities, limits the capacity to complete holistic analysis of critical resources at large watershed scales. Humans …