University of North Georgia
  • Cumming, GA, United States
Recent publications
In our civic engagement afterschool program in the southeast of the United States, our youth and adult participants used a wide range of modalities including mapping, rapping, drawing, and performance to construct and convey their unique visions of school and community spaces. The purpose of this methodological paper is to explore systemic functional multimodal discourse analysis (SF MDA) as a potential resource to gauge the effectiveness of such humanizing and multimodal spaces in positioning youth as civic leaders. Data collected for this study included curriculum materials, descriptive field notes, and video recordings of the multimodal processes of focal youth across five program modules. Informed by an SF MDA perspective, our multimodal transcriptions illustrate how youth participants engaged in an intersemiotic complementarity of modalities and languages to share their insights and enact civic identities.
FTIR and Raman spectra of melaminium cyanoacetate have been recorded and analyzed. Band assignments are given based on the melamine and cyanoacetic acid molecules. The ring breathing vibrations of the triazine ring show frequency shift toward the high wavenumber side. This change is attributed to an increase in rigidity of the ring as a consequence of protonation and the formation of donor–acceptor types of hydrogen bonding interactions. Notably, this melaminium cyanoacetate salt also contributes to the efficient flame-retardant properties of polyurethane foam substrate as revealed by the flammability test and thermogravimetric analysis.
This study explored and documented the science and engineering practices of older adults living in Southern Appalachia. Informed by the body of research related to lifelong learning, hobbies, Funds of Knowledge, and science and engineering practices, a descriptive case study was designed to interview four older adult individuals about their leisure, hobby, everyday activities as well as their perceptions of science and engineering. The findings of this study indicated that these individuals were involved in activities that required robust science and engineering skills and shared their learning with others in their community. As the Appalachian context is often described through a deficit model approach, documenting and celebrating the specific knowledge and skills of Appalachian adults and connecting these valued practices to the community context may support growth and sustainability of the region.
Primary Scientific Literature (PSL) has been used in undergraduate classrooms as a way to engage students with the research process and to increase science literacy. Most curricula lack any formal training for undergraduates to critically read PSL even though most undergraduate science courses require students to engage with PSL at some level.
There is a growing interest in the introduction of cyclic voltammetry to upper-level undergraduate chemistry students. This work presents a simple buffer-free cyclic voltammetry experiment for the quantification of elemental iron in ferrous sulfate supplements using standard addition to a single solution. The various student learning outcomes highlighted in this work include the introduction to the basic principles of cyclic voltammetry, the construction of a calibration curve based on the Randles−Sevcik equation, obtaining a linear regression equation using Microsoft excel, acid digestion of drug supplements, and quality assurance through a statistical evaluation of experimental data. This laboratory experiment also emphasizes the advantages of using the method of a standard addition to a single solution.
Recent discussions in education, industry, and government have focused on the need for growth and diversity in STEM fields. STEM education and practice directly contribute to the economic vitality of a nation and benefit its citizens. Yet, STEM education and employment growth seem lopsided concerning both gender and diversity. While researchers have studied various dimensions of this phenomenon, this paper seeks to add to the knowledge base by analyzing the effects of gender and college major on performance and attitudes in statistics-related courses. T-tests, one-way analysis of variance, and multiple regression were used to investigate the effects of gender, major, and attitude on performance in business statistics courses. Results indicate that, in the business statistics course, there were no significant differences between the average score of male students and female students in 2 of 3 semesters. In the marketing research course, where similar statistical concepts as taught in the business statistics course were adopted, results were similar. However, there were differences in the students’ scores when their academic majors were considered. Findings from this study can contribute to developing effective and innovative pedagogical methodologies to teach statistics and related subjects.
There is a growing interest in the introduction of cyclic voltammetry to upper-level undergraduate chemistry students. This work presents a simple buffer-free cyclic voltammetry experiment for the quantification of elemental iron in ferrous sulfate supplements using standard addition to a single solution. The various student learning outcomes highlighted in this work include the introduction to the basic principles of cyclic voltammetry, the construction of a calibration curve based on the Randles−Sevcik equation, obtaining a linear regression equation using Microsoft excel, acid digestion of drug supplements, and quality assurance through a statistical evaluation of experimental data. This laboratory experiment also emphasizes the advantages of using the method of a standard addition to a single solution.
For a connected graph G, let κ′(G) be the edge-connectivity of G. The ℓ-edge-connectivity κℓ′(G) of G with order n≥ℓ is the minimum number of edges that are required to be deleted from G to produce a graph with at least ℓ components. It has been observed that while both κ′(G) and κℓ′(G) are related edge connectivity measures. In general, κℓ′(G) cannot be upper bounded by a function of κ′(G). Let κ¯′(G)=max{κ′(H):H⊆G} be the maximum subgraph edge-connectivity of G. We prove that for integers k′,k and ℓ with k′≥k≥1 and ℓ≥2, each of the following holds. (i) sup{κℓ′(G):κ′(G)=k,κ¯′(G)=k′}=k+(ℓ−2)k′. (ii) inf{κℓ′(G):κ′(G)=k,κ¯′(G)=k′}=kℓ2.
This manuscript aims to present the framework for the development of a four-stage tool for sustainable groundwater management as one of the highly interactive three-day workshop products. The four stages in the tool are (1) representing the target system, (2) description of the target system using components of DPSIR framework (drivers, pressures, state, impact, responses), (3) development of causal chains/loops, and (4) identifying knowledge gaps and articulating next steps. The tool is an output from the two-day Indo-US bilateral workshop on "Integrated Hydro-chemical Modeling for Sustainable Development and Management of Water Supply Aquifers". Four case studies from the invited talks, panel discussions, and breakout sessions were selected to demonstrate the developed four-stage framework to a coastal aquifer (India) and in high plains in Floridian, Piedmont, and Blueridge aquifers (United States of America). The developed tool can be practically used in the development of strategies for the sustainable use of groundwater in various regions around the world (e.g., planning/building/maintaining groundwater recharging structures). Continued work can result in establishing a center for excellence as well as developing a network project. The recommendations from the workshop were: (1) developing vulnerability analysis models for groundwater managers; (2) treatment and new ways of using low-quality groundwater ; (3) adopting groundwater recharge; (4) mitigating pollutants getting into the aquifer; and (5) reducing groundwater use. This study provides a framework for future researchers to study the groundwater table related to the effectiveness of water recharging structures, developing a quantitative model from the framework. Finally, recommendations for a future study are more data collection on groundwater quality/recharge as well as enhancing outreach activities for sustainable groundwater management.
Cellulose is a primary structural component of plants and is one of the most abundant polymers on the Earth. Degradation of this recalcitrant component of plant biomass is an important process in the global carbon cycle and can potentially provide feedstock for biofuels. Fungi and bacteria are the primary organisms able to breakdown biomass-derived cellulose. Anaerobic bacteria, present in cellulose degrading ecosystems, such as compost piles, soils rich in organic matter, aquatic sediments, and digestive systems of herbivores, have developed efficient pathways to maximize metabolic energy from biomass degradation. In the absence of terminal electron acceptors, such as oxygen, hydrogen-producing pathways are common methods of electron carrier recycling. Electron bifurcating systems linked to hydrogen metabolism play an important role in anaerobic metabolism. In this study, samples from environmental cellulose-degrading microbial communities were collected, and the metabolic products produced during anaerobic cellulose degradation were examined. Samples from different environments produced different fermentation products from cellulose, suggesting flexibility in the fermentative degradation pathways. The most abundant products observed included hydrogen, acetate, propionate, butyrate, ethanol, and methane.
In this paper we introduce the permanent of Toeplitz matrices with entries from the Narayana sequence. We prove that when a particilar class of Toeplitz matrices is built from Narayana numbers in a certain way, then the permanent of this class can be defined as an exponential function.
Pandres has developed a theory which extends the geometrical structure of a real four-dimensional space-time via a field of orthonormal tetrads with an enlarged covariance group. This new group, called the conservation group, contains the group of diffeomorphisms as a proper subgroup. The free-field Lagrangian density is \(C^\mu C_\mu \sqrt{-g}\,\), where \(C^\mu \) is a vector which measures curvature. When massive objects are present a source term is added to this Lagrangian density. The weak-field approximation implies that gravitational waves travel at the speed of light. Spherically symmetric solutions for both the free field and the field with sources are found. In the free-field case, the field equations require nonzero stress-energy tensors. However, we find that for our model to be an acceptable model, we must have a source term in the Lagrangian. In our framework, we divide up the galaxy into three spherically symmetric regions: a baryonic matter-dominated central bulge, a dark matter-dominated mesosphere and an outside region where neither type dominates. Assuming the density of baryonic matter has a central cusp, we show how to model the bulge. Via an isothermal condition we find a model for the mesosphere and show this model implies flat rotation curves with one free parameter. The outside region is readily modeled via previously published results. The models for the bulge, mesosphere and outside region are combined into one continuous model. Using the radial acceleration relation we then show how a galaxy model may be set up for a rotationally supported galaxy.
A group key agreement protocol allows a set of users to share a common secret in presence of adversaries. In symmetric group key agreement protocol, the set of users will have a secret key at the end of protocol while in an asymmetric group key agreement protocol, the set of users negotiate a shared encryption and decryption keys, instead of establishing a common secret. Long-term security is a notion of resistance against attacks even if later, after completion of the protocol some security assumptions become invalid. In this paper, we propose a long-term secure one-round asymmetric group key agreement protocol. Our protocol is based on Bilinear Diffie-Hellman assumption and real-or random indistinguishability of the symmetric encryption scheme. For authentication purpose we use a signature scheme and timestamps.
Technology use has become ubiquitous, and with thousands of cybercrimes happening each day, there is a high demand for those who know how to identify these crimes and investigate them safely and appropriately. Since new and revolutionary ideas and technologies occur almost daily, so does the risk of intellectual property theft to acquire trade secrets and proprietary products. Theft of intellectual property has also become a growing threat to our national security. By refusing to recognize these actions as criminal, other countries shield many of the individuals responsible for these crimes. This research aims to examine how countries, companies, and agencies deal with intellectual property theft and to provide a breakdown of how intellectual property theft affects today’s industries and the damage it can cause. When intellectual property thefts do occur, it is important to understand the necessary steps to handle the situation and how professionals go about collecting evidence from these crimes.KeywordsCybercrimeDigital forensicsCybersecurity
In a 1993 book review, E. Pearlstein asks, “Why don’t textbook authors begin their discussion of magnetism by talking about magnets? That’s what students have experience with.” A similar question can be asked, “Why don’t professors have students measure the force between permanent magnets in introductory physics labs?” The answer to both questions may be the same. There is no simple equation describing the force between two permanent magnets. Yet, this familiar magnetic phenomenon deserves investigation. This article presents a novel apparatus using 3D-printed parts for measuring the force between two small cylindrical neodymium permanent magnets as a function of their separation. Data collected using this apparatus is compared to two models, namely an ideal dipole–dipole interaction, and the force between parallel coaxial loops of current.
The Neosho Bass (Micropterus velox), a former subspecies of the keystone top-predator and globally popular Smallmouth Bass (M. dolomieu), is endemic and narrowly restricted to small, clear streams of the Arkansas River Basin in the Central Interior Highlands (CIH) ecoregion, USA. Previous studies have detected some morphological, genetic, and genomic differentiation between the Neosho and Smallmouth Basses; however, the extent of neutral and adaptive divergence and patterns of intraspecific diversity are poorly understood. Furthermore, lineage diversification has likely been impacted by gene flow in some Neosho populations, which may be due to a combination of natural biogeographic processes and anthropogenic introductions. We assessed: (1) lineage divergence, (2) local directional selection (adaptive divergence), and (3) demographic history among Smallmouth Bass populations in the CIH using population genomic analyses of 50,828 single-nucleotide polymorphisms (SNPs) obtained through ddRAD-seq. Neosho and Smallmouth Bass formed monophyletic clades with 100% bootstrap support. We identified two major lineages within each species. We discovered six Neosho Bass populations (two nonadmixed and four admixed) and three nonadmixed Smallmouth Bass populations. We detected 29 SNPs putatively under directional selection in the Neosho range, suggesting populations may be locally adapted. Two populations were admixed via recent asymmetric secondary contact, perhaps after anthropogenic introduction. Two other populations were likely admixed via combinations of ancient and recent processes. These species comprise independently evolving lineages, some having experienced historical and natural admixture. These results may be critical for management of Neosho Bass as a distinct species and may aid in the conservation of other species with complex biogeographic histories.
There are many benefits to the addition of exercise to cancer treatment and survivorship, particularly with resistance training regimens that target hypertrophy, bone mineral density, strength, functional mobility, and body composition. These goals are best achieved through a series of individualized high-intensity compound movements that mirror functional mobility patterns and sufficiently stress the musculoskeletal system. As a result of adequate stress, the body will engage compensatory cellular mechanisms that improve the structural integrity of bones and muscles, stimulate metabolism and the immune system, optimize functional performance, and minimize mechanical injury risk. The current evidence suggests that application of the above exercise principles, practiced in a safe environment under expert observation, may offer patients with cancer an effective means of improving overall health and cancer-specific outcomes. The following article poses several important questions certified exercise specialists and physicians should consider when prescribing resistance exercise for patients with cancer.
Novel Gordonia phage Amore2 was isolated from Pittsburgh, Pennsylvania and infects Gordonia terrae 3612. Amore2 was placed into Actinobacteria cluster CS1. Its genome is 73,842 bp with 105 predicted open reading frames and 56.6% GC content. The closest similarity of Amore2 is Gordonia phage Austin, with a 98% nucleotide identity.
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1,575 members
Clarke Miller
  • College of Science and Mathematics
Thomas Vogel
  • Physics and Astronomy
Patrick Bunton
  • Physics and Astronomy
Stanislaw Solnik
  • Department of Physical Therapy
Jacob Michael Bateman McDonald
  • Lewis F. Rogers Institute for Environmental and Spatial Analysis
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