University of West Georgia
  • Carrollton, United States
Recent publications
An edge (vertex) cut X of G is r-essential if G−X has two components each of which has at least r edges. A graph G is r-essentially k-edge-connected (resp. k-connected) if it has no r-essential edge (resp. vertex) cuts of size less than k. If r=1, we simply call it essential. Recently, Lai and Li proved that every m-edge-connected essentially h-edge-connected graph contains k edge-disjoint spanning trees, where k,m,h are positive integers such that k+1≤m≤2k−1 and h≥m2m−k−2. In this paper, we show that every m-edge-connected and 2-essentially h-edge-connected graph that is not a K5 or a fat-triangle with multiplicity less than k has k edge-disjoint spanning trees, where k+1≤m≤2k−1 andh≥f(m,k)={2m+k−4+k(2k−1)2m−2k−1,m<k+1+8k+14,m+3k−4+k2m−k,m≥k+1+8k+14. Extending Zhan's result, we also prove that every 3-edge-connected essentially 5-edge-connected and 2-essentially 8-edge-connected graph has two edge-disjoint spanning trees. As an application, this gives a new sufficient condition for Hamilton-connectedness of line graphs. In 2012, Kaiser and Vrána proved that every 5-connected line graph of minimum degree at least 6 is Hamilton-connected. We allow graphs to have minimum degree 5 and prove that every 5-connected essentially 8-connected line graph is Hamilton-connected.
The lived experiences of eight African American women college students were explored from an interpretive phenomenological analytic framework. The researchers identified six main themes about participants and their reported family dynamics: (a) collectivistic yet disconnected, (b) avoidance, (c) functioning in dysfunction, (d) gendered differences, (e) motivation to change the family's homeostasis, and (f) talking about generational trauma as a motivator to repair communication. Implications for culturally responsive counseling and generational trauma‐informed counselor training are discussed.
In light of an ongoing climate change and an increasing fragility of fossil energy supply due to global political tensions, the adoption of renewable energy sources is of utmost importance for economic and social prosperity. This study targets to endeavor major value chain configurations within the global wind power industry network based on a data set of 326 relationships established by the 10 globally leading wind turbine firms covering a time span of 15 years. We discuss the demand side and provide an overview of the main wind power investment target countries and compare the importance of different regions. On the supply side, we analyze and identify eight important firm clusters within the global wind power business network. Concerning our sample, we elaborate horizontal and vertical relationship links, their collaboration patterns, regional partner preferences, and their value chain competences, thus providing valuable insights into the competitive structures of the wind power industry. By doing so, we open the debate on appropriate and efficient firm strategies within renewable industries. As consequence, we provide robust empirical evidence on global wind power industry architectures and corresponding competitive firm forces for the future. As we found that the industry is currently divided into eight main global industry clusters, our study delivers valuable industry network insights addressing managerial, political, and socioeconomic decision makers in order to secure future ecological and economic prosperity in a challenging world.
This article attempts to provide a comprehensive overview of the academic literature on the subject, examining the different approaches, their similarities and general differences, advantages and disadvantages, and providing a consolidated and critical perspective that will hopefully be useful for future research in the field. The paper presents the results of a systematic review of Western academic studies on the existence of echo chambers in social media, an initial classification of the literature and the identification of research patterns. The authors show how conceptual and methodological choices influence research findings on the topic. Future research should take into account the potential shortcomings of different approaches and the significant potential of linking data.
Myotis austroriparius (Southeastern Myotis) traditionally inhabit bottomland hardwood forests along the Atlantic coastal plain and lower Mississippi River Valley. This insectivorous bat is a species of conservation concern in Alabama and Georgia and was thought to be restricted to the Southern Coastal Plain and Southeastern Plains ecoregions. Based primarily on cave, transportation-structure, and mist-netting surveys, we documented occurrences of Southeastern Myotis in 14 Alabama and 20 Georgia counties outside and along the border of the accepted range, including in the Piedmont, Ridge and Valley, Interior Plateau, and Southwestern Appalachians ecoregions. We reviewed observations of bats year-round in both states, including pregnant and lactating females and winter hibernacula. Roosting sites included caves, culverts, bridges, and tree cavities. Combined, these observations provide strong evidence that the range of Southeastern Myotis should consist of all Alabama and Georgia except for the Blue Ridge ecoregion. This increase in distribution may result from increased surveying efforts and/or range expansion due to climate change, as observed in other southeastern bat species.
A cyclic base ordering of a connected graph G is a cyclic ordering of E(G) such that every cyclically consecutive |V(G)|-1 edges induce a spanning tree of G. The density of G is defined to be d(G)=|E(G)|/(|V(G)|-1); and G is uniformly dense if d(H)≤d(G) for every connected subgraph H of G. It was conjectured by Kajitani, Ueno and Miyano that G has a cyclic base ordering if and only if G is uniformly dense. In this paper, we study cyclic base ordering of generalized Petersen graphs to support this conjecture.
This case study using collaborative autoethnographic methods explores the experiences of two K12 practitioners as they implemented, and continue to implement, human performance improvement (HPI) in their professional practice. The connection between HPI and instructional design and technology is well documented, but there is not much empirical work examining how the HPI process is utilized in K12 organizations. Using practitioner reflections and semi-structured interviews, our team identified three themes that categorized practitioners’ experiences: 1. How practitioners conduct HPI, 2. The outcomes of HPI, and 3. Why one should use HPI. Differences between the two practitioners were also discussed. Overall, we concluded that there is a definitive place for HPI in a K12 setting as it can result in meaningful organizational change, save time when diagnosing problems, and empower educators. We conclude with the realization that not all practitioners will be able to adopt this approach within their organizations seamlessly.
The population of international student-athletes (ISAs) at the collegiate level has dramatically impacted the sporting landscape in North America. Whereas a passionate group of fans is vital to the success of a sports team, the development of that athlete–fan relationship has grown due to the increased media attention on athlete personal branding and social media presence. The present study explores ISAs’ perceptions of social media use for personal branding, the challenges they face, and the extent to which they interact with fans through social media in a post-pandemic context. Athletes have pivoted more recently from personal appearances and other face-to-face interactions to more virtual means of interacting with fans. Ten semi-structured interviews were conducted with ISAs from various sports within Divisions I and II of the National Collegiate Athletic Association. Four main themes emerged: (1) social media consumption versus content creation, (2) effects of name, image, and likeness regulations, (3) personal brand building on social media, and (4) fan interaction on social media for ISAs. The study aims to inform various collegiate athletics stakeholders on the potential value of ISAs’ personal branding for fan interaction and how this has been impacted by current name, image, and likeness restrictions.
Platymerella from the lower Red Mountain Formation in Georgia and Tennessee, the Bowling Green Dolomite of west-central Illinois, and the Elwood Dolomite of northeastern Illinois represents a paleosubtropical, cool-water occurrence of virgianid brachiopods in Laurentia during the early Silurian (middle–late Rhuddanian). These occurrences were located in the southern Appalachian foreland basin and the distal end of the Sebree Trough, likely subjected to frequent cool-water current and upwelling from Gondwana. Compared with broadly coeval species of Virgiana from lower paleotropical to equatorial latitudes, Platymerella has significantly smaller, dorsoventrally flattened shells, with subequal ventral and dorsal umbones and beaks that extend only slightly above the hinge line. Relative to its shell size, however, Platymerella has more prominent thickening of the shell wall, median septum, spondylium, and hinge plates than Virgiana , resembling more closely the extravagant shell thickening of Tcherskidium and Proconchidium from the Late Ordovician (late Katian) equatorial regions. The thickening of hinge plates resulted in the formation of a pseudocruralium, which separates Platymerella from Virgiana . In latest Ordovician–earliest Silurian virgianids, there was a general morphological gradient toward a smaller shell, reduction in the ventral-valve convexity, and reduction in the size and height of the ventral umbo from paleoequatorial to southern subtropical regions, with Platymerella representing the most southerly forms.
How is the split black subject symbolized? The article attempts this question with its Lacanian-styled gap-filling (or -opening) method, using two clues — one from The Big Bang Theory sitcom, and the other from Achebe’s Things Fall Apart . The split subject comes before the imaginary, the mirror stage, which begins with the child’s experience of the Parental Other. Colonization and civil rights then become a later stage in the growth process of the black race, where the white acted as a Parental or Significant Other. Amy Farrell Fowler and Sheldon Cooper from CBS’ The Big Bang Theory (Season 6, Episode 21, first aired on April 25, 2013) both symbolically portray the colonial condition of Africa. After several failed attempts to attain gratification from his Significant Other, Cooper’s revolutionary attention to his “split subject’s needs” without Amy offers a new lens to theorize colonization as a “halfway error” to be corrected and transcended to reach where Okonkwo, in Things Fall Apart , fails. The unrootedness of being black would then polish the new surface to which the entire black race globally can behold and do something not done before.
We examine whether firm‐level political risk influences auditor behaviour. Using a text‐based political risk measure, we find that firms subject to higher levels of political risk face longer audit report lags, are more likely to have going‐concern opinions issued by their auditors and pay higher audit fees. However, the effect of political risk on audit outcomes becomes moderated in the presence of higher lobbying efforts. Our findings suggest that political risk and lobbying efforts to mitigate such risk both influence auditors' judgments in planning audit services. Our original findings survive in a battery of robustness checks, and the primary results do not change when we use an exogenous political shock as an alternative proxy for firm‐level political risk.
This study investigates whether firm-level political risk increases managers’ propensity to avoid taxes. Using a measure of firm-level political risk developed by Hassan et al. (Quart J Econom 134(4):2135–2202, 2019) and several commonly used measures of tax avoidance, we find that corporate tax avoidance increases with firm-level political risk and that the main results hold in various supplemental and endogeneity tests. In cross-sectional tests, we document that the positive relationship between firm-level political risk and tax avoidance is stronger for lower levels of tax avoidance, and is weaker when firms have superior cash flow performance and higher cash holdings. In addition, we show that the positive relationship between firm-level political risk and tax avoidance is stronger during the Trump administration’s trade policy changes as well as during the global financial crisis.
Daily and seasonal fluctuations in environmental conditions can significantly impact the survivorship and reproductive success of animals by altering energetic costs and predation risks. Behaviorally, animals often respond to changes in their environment through regulation of activity and associated movement patterns. We used accelerometer-informed GPS telemetry to assess nightly activity and movement patterns in response to environmental conditions in a small endotherm, the eastern spotted skunk (Spilogale putorius). Nightly movements and activity of skunks were monitored in association with ambient temperature, precipitation, and moon illumination during late winter through summer in Alabama. Eastern spotted skunks were strictly nocturnal, exhibiting almost no daytime activity. Total time active and total distance moved each night increased with ambient temperature and rainfall. Variation in moon illumination, which may affect predation risk, did not impact skunk nightly activity or movement. Eastern spotted skunks likely reduce predation risk by being active between sunset and sunrise when they are less visible to predators. Lower activity and movement at cooler temperatures significantly reduces thermoregulatory costs for small endotherms. Increased activity of skunks during or shortly after precipitation may be driven by increased prey availability. Our findings indicate that small endotherms, like the eastern spotted skunk, rely extensively on behavioral thermoregulation, instead of physiological adaptation, to buffer themselves against changing environmental conditions. Behavioral flexibility may promote species persistence as climate changes, and should be considered in conservation strategies of vulnerable species, such as eastern spotted skunks.
Value co-creation measurements in a recurring sporting event sprang from an academic and a practical desire to understand value co-creation. This study aims to (1) identify and explore the co-production and value-in-use, two dimensions of value co-creation measurement; (2) verify the validity of the measurements of the value co-creation model; and (3) examine whether noteworthy differences exist between residents and tourists in co-creation, respectively. For this purpose, this study conducted two studies. Study 1 establishes the value co-creation model and compares the reflective and formative models. Study 2 tests the proposed model’s validity and reliability and examines the moderating effect of travel patterns (residents and tourists). The results indicated that the value co-creation measurement is hierarchical and exhibits reliability and validity in the reflective model. The results further demonstrate that co-production and value-in-use patterns differ by residents or tourists. The current study uses S-D logic to better understand value co-creation’s hierarchical theoretical nature from the perspective of residents and tourists in the recurring sporting event context, thus contributing to sport management literature. Furthermore, this paper contributes to value co-creation studies, showing that various attendees (residents and tourists) perceive different levels of co-creation because resources may vary by social group.
In this paper we study solvability of multi-term Caputo and Riemann-Liouville fractional oscillation integro-differential equations. We show that these equations have unique solutions in the space of functions with square average power growth and derive the solutions in explicit forms.
Science Cafés create open, public forums to promote the exchange of ideas between science experts and the public. This study explored Science Café attendees’ interest in science content, and motivational factors in attending events as well as documenting what attendees did with the information presented at an event through the means of a survey (n = 124) and interviews (n = 17). The Synthesized Elements for Informal Learning Experiences at Science Cafés represents a merged perspective of informal learning environments, based on self-determination theory and the contextual model of learning. The synthesized elements (endogenous and ecological) may provide an explanation of the public’s motivation in attending Science Café events. Based on survey and interview data, the majority of participants reported endogenous elements (knowledge and learning; fulfills personal needs) as motivational factors to attend Science Café events. Additionally, attendees stated ecological elements, such as social interactions, with other attendees and science experts were significant motivational influences to attend events. Survey and interview respondents cited they share and discuss the information gained from a Science Café event with others in their social network (e.g., family members, friends, and colleagues). This information may inform best practices in connecting the community to science experts in order to share scientific endeavors and documenting the profound effect science has on the public.
This study investigated the self-efficacy of content area, methods instructors (n = 395) in working with lesbian, gay, bisexual, transgender, queer, intersex, asexual+ (LGBTQIA+) pre-service students, teaching LGBTQIA+ content in their methods courses and helping pre-service teachers reduce their bias and prejudice against LGBTQIA+ individuals. The study revealed that literacy and social studies methods instructors had a higher sense of self-efficacy than their mathematics and science counterparts. Participants had a higher sense of self-efficacy in working with LGBTQIA+ students than teaching LGBTQIA+ content. Participants employ a variety of pedagogical strategies to implement LGBTQIA+ content in methods courses.
Thermoelectricity, which converts heat energy directly into electricity, can be utilized as a waste heat recovery mechanism as well as an alternative energy resource. The thermoelectric generators (TEGs) consist of an array of p–n junctions made of two different thermoelectric materials (TEMs). TEGs can create a potential difference as a result of a temperature difference applied across the junction. Widely used and the best-known TEMs such as Bi2Te3 and Sb2Te3 are hazardous in nature. Therefore, there is an emerging need to search for new non-toxic TEMs. This study investigates the thermal, electrical, and thermoelectric properties of organic polyaniline (PANI) and the inorganic ceramic zinc oxide (ZnO). Further, it is extended to fabricate an organic/inorganic p–n junction suitable for hybrid TEGs using PANI and ZnO. Electrical conductivity and thermal conductivity of PANI, ZnO, and Al-doped ZnO (Al-ZnO) and the Seebeck coefficient, figures of merit and power factors of respective thermocouples were investigated. Fourier transform infrared spectroscopy and x-ray diffraction spectra confirmed the successful synthesis of PANI, ZnO, and Al-ZnO. The temperature-dependent electrical conductivity of all the compounds exhibits a semiconductor behavior. The temperature-dependent Seebeck coefficient of PANI and Al-ZnO are consistent with the values reported in the literature. However, ZnO showed a deviation. The PANI-ZnO thermocouple generated a potential difference of 21.16 mV at a temperature difference of 77 K and these materials indicate promising prospects of nontoxic and low-temperature TEMs.
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Marie-Cécile Bertau
  • Department of Anthropology Psychology and Sociology; Program of Psychology
Barbara Kawulich
  • Department of Leadership, Research, and School Improvement
Xiaofeng Gu
  • Department of Computing and Mathematics
Amin Boumenir
  • Department of Mathematics
Carrollton, United States