Old Dominion University
  • Norfolk, Virginia, United States
Recent publications
Background Biochar ozonization was previously shown to dramatically increase its cation exchange capacity, thus improving its nutrient retention capacity. The potential soil application of ozonized biochar warrants the need for a toxicity study that investigates its effects on microorganisms. Results In the study presented here, we found that the filtrates collected from ozonized pine 400 biochar and ozonized rogue biochar did not have any inhibitory effects on the soil environmental bacteria Pseudomonas putida, even at high dissolved organic carbon (DOC) concentrations of 300 ppm. However, the growth of Synechococcus elongatus PCC 7942 was inhibited by the ozonized biochar filtrates at DOC concentrations greater than 75 ppm. Further tests showed the presence of some potential inhibitory compounds (terephthalic acid and p -toluic acid) in the filtrate of non-ozonized pine 400 biochar; these compounds were greatly reduced upon wet-ozonization of the biochar material. Nutrient detection tests also showed that dry-ozonization of rogue biochar enhanced the availability of nitrate and phosphate in its filtrate, a property that may be desirable for soil application. Conclusion Ozonized biochar substances can support soil environmental bacterium Pseudomonas putida growth, since ozonization detoxifies the potential inhibitory aromatic molecules. Graphical Abstract
Cultural intelligence (CQ) is an increasingly valuable asset for managers, employees, entrepreneurs, and their organizations. While there is now considerable evidence for its benefits, knowledge remains cloudy surrounding its antecedents. Drawing on identity theory, we develop a model unpacking the relationship between cross-cultural experience—a core antecedent with mixed findings in extant research—and CQ. We advance multicultural identity as a pivotal intervening variable and probe the role of self-verification striving as an identity-based boundary condition. Across two interlocking studies, we find evidence for how CQ can be cultivated from a range of increasingly common forms of cross-cultural experiences. In doing so, we shed light on the mixed results in prior research and provide key implications for future research; namely, multicultural identity helps to better account for when and how individuals translate their cross-cultural experiences into CQ.
The study of inner and cyclic functions in ℓAp spaces requires a better understanding of the zeros of the so-called optimal polynomial approximants. We determine that a point of the complex plane is the zero of an optimal polynomial approximant for some element of ℓAp if and only if it lies outside of a closed disk (centered at the origin) of a particular radius which depends on the value of p. We find the value of this radius for p≠2. In addition, for each positive integer d there is a polynomial fd of degree at most d that minimizes the modulus of the root of its optimal linear polynomial approximant. We develop a method for finding these extremal functions fd and discuss their properties. The method involves the Lagrange multiplier method and a resulting dynamical system.
Field self-interactions are at the origin of the non-linearities inherent to General Relativity. We study their effects on the Cosmic Microwave Background anisotropies. We find that they can reduce or alleviate the need for dark matter and dark energy in the description of the Cosmic Microwave Background power spectrum.
This study proposes a supply chain resilience assessment framework at the network (i.e. structural) level based on quantifying supply chain networks’ structural factors and their relationships to different resilience strategies, by using a hybrid DEMATEL–ANP approach. DEMATEL is used to quantify interdependencies between the structural resilience factors, and between the resilience strategies. ANP is then used to quantify the outer-dependencies among these elements and to construct the limit super-matrix from which the global weights of all the decision network’s elements are estimated. To create the structural resilience factors, different network factors are selected and adopted from the social network analysis and supply chain resilience literatures. A case study is then performed to assess the performance of the proposed approach and to derive important observations to support future decision making. According to the results, the proposed approach can suitably measure the resilience performance of a supply chain network and help decision makers plan for more effective resilience improvement actions.
Using approximately 30,000 arrest records from the Pinellas County Sheriff’s Office in Florida and neighborhood characteristics from the U.S. Census American Community Survey, this study examines the relationship between foreign-born status and recidivism. In addition, we investigate whether any plausible relationship between foreign-born status and recidivism is conditioned by neighborhood characteristics. The results from hierarchical logistic regression analyses reveal that foreign-born offenders are less likely to recidivate than native offenders. Furthermore, the negative effect on recidivism for foreign-born offenders is amplified in neighborhoods with higher socioeconomic inequality. We discuss implications for policy and future research.
Higher education institutions have been criticised as neo-colonial entities that subjugate, other or silence international students. With a goal towards creating a more equitable and inclusive campus environment, this study aims to center the voices of international students and illuminate the heterogeneity of their perceptions of the campus environment. To this end, we investigated differences in 1681 international students’ perceptions of culturally engaging campus environments by intersections of identity and status. Multivariate analysis of variance (MANOVA) examined identity variables (age, race, region, social class, first generation, and disability) and status variables (degree level, field of study, living situation, and visa status) on perceptions of culturally engaging campus environments. Findings indicate that region, visa status, and social class had a significant relationship with perceptions of cultural relevance and responsiveness. The results indicate two-way interactions between living situations and gender identification, as well as degree level and race. The discussion explores the need to understand the intersectional voices of students facing multiple discriminations to begin to equalize power differentials embedded within the neo-colonial relationship between higher education institutions and international students.
Accurate load forecasting is indispensable in various applications of the electric power industry. Although existing load forecasting methods perform well, they cannot handle complicated scenarios where load-related data are highly random and uncertain. To deal with this issue, A Quantitative Combination Load Forecasting model(QCLF) is proposed. Its main idea is to incorporate the load forecasting errors into the forecasting process as an optimization problem, which can significantly reduce the adverse impacts of random and uncertain load-related data. First, we propose an improved K-Means and Least Square-based Load Forecasting Error Model(LFEM-KLS) to improve the availability and effectiveness of load-related data. Second, we employ gene expression programming (GEP) to optimize the proposed LFEM-KLS to achieve highly accurate load forecasting. Experimental results on three load datasets demonstrate that a QCLF model significantly outperforms other related load forecasting models.
The purpose of this study was to examine if a relationship exists between the coronavirus 2019 pandemic and posttraumatic stress disorder in clinical nurse specialists. The study used a nonexperimental, correlational, cross-sectional design to explore the relationship between exposure to the coronavirus 2019 pandemic and posttraumatic stress disorder signs and symptoms. The National Association of Clinical Nurse Specialists distributed the electronic survey from August to October 2020. State affiliates and accrediting bodies distributed the survey from October to December 2020. The survey consisted of the Impact of Events Scale — Revised, which measures signs and symptoms of posttraumatic stress disorder. The target sample size was at least 100. Statistically significant relationships were identified between the participant demographics, coronavirus 2019 exposure, and signs and symptoms of posttraumatic stress disorder in clinical nurse specialists. Of 129 participants, 30% had Impact of Events Scale — Revised scores that are clinically concerning for posttraumatic stress disorder. Clinical nurse specialists can guide policy, practice, and education interventions to combat posttraumatic stress disorder due to the coronavirus 2019 pandemic.
School counseling classroom lessons provide all K-12 students with Tier 1 preventive supports. Educators use classroom management strategies to best deliver classroom lesson content to K-12 students, although the existing literature for school counselors in particular is sparse (e.g., Goodman-Scott, 2019; Runyan et al., 2019). We describe the creation and validation of the first known assessment on school counseling classroom management: the School Counseling Classroom Management Inventory, resulting in a five-factor model. Our discussion includes strategies for school counselors at the preservice, practicing, district, and counselor education levels to best use this inventory to serve students in K-12 schools.
  • Jeffrey GlassmanJeffrey Glassman
  • Sarah YahoodikSarah Yahoodik
  • Siby SamuelSiby Samuel
  • [...]
  • Yusuke YamaniYusuke Yamani
Objective: We examined the effectiveness of a second exposure to ACCEL, a novel driving training program, on latent hazard anticipation (HA) performance several months after their first exposure. Background: Past research has demonstrated that PC-based driver training programs can improve latent HA performance in young novice drivers, but these improvements are below the ceiling level. Method: Twenty-five participants were randomly assigned to either the Placebo group, the ACCEL-1 group, or the ACCEL-2 group. Following the completion of the assigned training program, participants drove a series of eighteen scenarios incorporating latent hazards in a high-fidelity driving simulator with their eyes tracked. Participants returned two to six months following the first session and completed either the placebo program (ACCEL-1 and Placebo groups), or a second dose of training program (ACCEL-2 group), again followed by simulated evaluation drives. Results: The ACCEL-2 group showed improved HA performance compared to the ACCEL-1 and Placebo groups in the second evaluation. Conclusion: ACCEL enhances young novice drivers' latent HA performance. The effectiveness of ACCEL is retained up to 6 months, and a second dose further improves HA performance. Application: Policy makers should consider requiring such training before the completion of graduate driver license programs. Young novice drivers that do not show successful latent HA performance could be required to complete additional training before being allowed to drive without restrictions.
Background This study aimed to investigate the association between 25-hydroxyvitamin D (25(OH)D) and depression symptoms among adolescents in Kuwait, a country with a high prevalence of vitamin D deficiency. Methods A school based cross-sectional study was conducted on randomly selected 704 adolescents in middle schools. Data on depression symptoms were collected using the Children’s Depression Inventory (CDI). Data on covariates were collected from the parents by self-administered questionnaire and from adolescents by face-to-face interview. Blood samples were analyzed in an accredited laboratory; and 25(OH)D was measured using liquid chromatography-tandem mass spectrometry. Results Of 704 adolescents, 94 (13.35%; 95%CI:10.35–17.06%) had depression symptom (a score of 19 or more on the CDI). There was no significant difference in the median CDI score between different vitamin D status (p = 0.366). There was also no significant correlation between serum 25(OH)D concentration and CDI score (Spearman’s rank correlation = 0.01; p = 0.825).There was no significant association between 25(OH)D and depression symptoms whether 25(OH)D was fitted as a continuous variable (crude odds ratio (OR) 0 .99 [95%CI: 0.98, 1.01], p = 0.458 and adjusted OR 1.01 [95%CI: 0.99, 1.02], p = 0.233), categorical variable as per acceptable cut-of points (crude analysis p = 0.376 and adjusted analysis p = 0.736), or categorical variable as quartiles (crude analysis p = 0.760 and adjusted analysis p = 0.549). Conclusion Vitamin D status does not seem to be associated with depression symptoms among adolescents in our setting. Nevertheless, it is important to have sufficient vitamin D levels during adolescence for several other health benefits.
Background Meeting daily guidelines for physical activity, screen time, and sleep duration is associated with a host of health indicators for youth. In this cross-sectional observational study, we investigated the associations between adherence to the movement guidelines and health-related outcomes among youth with autism spectrum disorder (ASD). Methods Parents of youth with ASD (10–17 years) from seven countries and regions were invited to provide online proxy-reports for child’s movement behaviors (i.e., physical activity, sleep and screen time), and health-related outcomes (i.e., body mass index [BMI], general health, and quality of life). A series of multiple linear regression analyses were used to examine the associations between meeting movement guidelines and health-related outcomes, adjusted for covariates. Results The final sample consisted of 1165 youth with ASD. Compared with youth meeting all three guidelines, a higher BMI z-score was observed in those who met no guidelines (B = 0.62, P = 0.04), “sedentary time only” (B = 0.60, P = 0.047), and “physical activity plus sleep only” (B = 0.85, P = 0.04). Compared with meeting all three guidelines, meeting no guidelines was associated with poorer general health (B = − 0.46, P = 0.02). Further, compared with youth meeting all three guidelines, a lower quality of life score was observed in those who met no guidelines (B = − 0.47, P = 0.02) and “physical activity only” (B = − 0.62, P = 0.03). Lastly, there were dose–response associations between the number of guidelines met and all three health-related outcomes (all Ptrend < 0.05). Conclusions In conclusion, meeting more 24-h movement guidelines was generally associated with more favorable health-related outcomes in youth with ASD. The low level of adherence to all three guidelines (2.0%) suggests the urgent need to promote the adoption of all the guidelines in this group.
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6,225 members
Andrew Collins
  • Department of Engineering Management and Systems Engineering
Sebastian Erich Kuhn
  • Department of Physics
Alvin Holder
  • Department of Chemistry and Biochemistry
Michael Stacey
  • Frank Reidy Research Center for Bioelectrics
Barbara Hargrave
  • School of Medical Diagnostic and Translational Services
23529, Norfolk, Virginia, United States