Physical Sciences and Mathematics Commons^™

Impact Assessment And Management Challenges Of Key Rural Human Health Infrastructure Under Sea Level Rise, Molly Mitchell, Robert Isdell, Julie Herman, Christine Tombleson

VIMS Articles

Accelerating sea level rise in Virginia, United States, will significantly increase the flooding threat to low-lying roads, residences, and critical infrastructure as well as raise the water table, allowing saltwater intrusion into well water and threatening the function of septic fields. Although most of the adaptation work in Virginia has focused on urban economic centers, the majority of the coastline is rural and faces different threats and opportunities to address them compared to urban areas due to their reduced economic assets and their reliance on private infrastructure. In this case study, we assess the potential for geospatially quantifying impact to …

Understanding The Effect Of Fire On Vegetation Composition And Gross Primary Production In A Semi-Arid Shrubland Ecosystem Using The Ecosystem Demography (Edv2.2) Model, Karun Pandit, Hamid Dashti, Andrew T. Hudak, Nancy F. Glenn, Alejandro N. Flores, Douglas J. Shinneman

Geosciences Faculty Publications and Presentations

Wildfires in sagebrush (Artemisia spp.)-dominated semi-arid ecosystems in the western United States have increased dramatically in frequency and severity in the last few decades. Severe wildfires often lead to the loss of native sagebrush communities and change the biogeochemical conditions which make it difficult for sagebrush to regenerate. Invasion of cheatgrass (Bromus tectorum) accentuates the problem by making the ecosystem more susceptible to frequent burns. Managers have implemented several techniques to cope with the cheatgrass–fire cycle, ranging from controlling undesirable fire effects by removing fuel loads either mechanically or via prescribed burns to seeding the fire-affected areas …

The Impact Of Twitter On The National Hockey League And Its Players, Benjamin Strauss

Honors Projects in Data Science

This study offers a new perspective on collecting and analyzing Twitter data surrounding the National Hockey League (NHL) to identify any trends or relationships between the data and overall performance during the 2021 abbreviated season. This paper provides and in-depth analysis by studying a sample of sixty of the top NHL players, specifically those who are typically top performers in the league, spanning over all thirty-one teams and all positions, this study was able to identify a deeper and broader perspective of what implications can be drawn from analyzing data from Twitter to both predict and reflect both individual player …

Non-Destructive Analysis Of Materials By Neutron Imaging At The Titan Facility, K. M. Nazarov, B. Mukhametuly, S. E. Kichanov, T. K. Zholdybayev, A. A. Shaimerdenov, K. B. Karakozov, D. S. Dyussambayev, M. T. Aitkulov, M. Yerdauletov, P. Napolskiy, M. Kenessarin, E. K. Kalymkhan, N. A. Imamverdiyev, S. H. Jabarov

Eurasian Journal of Physics and Functional Materials

Since 2019, the TITAN neutron radiography and tomography facility have been operating at the WWR-K research reactor. The experimental station is intended for a wide range of applications in various fields of science. Since the launch, several interesting works have been carried out to study the internal features of lithium-ion batteries and geophysical materials. The spatial resolution of the detector system was sufficient to visualize the internal elements of the lithium battery and to separate individual grains of thepyrite mineral in the rock sample. This paper presents the technical parameters of the experimental setup and the results of the recent …

Measuring The Yields And Angular Distributions Of Γ-Quanta From The Interaction Between 14.1 Mev Neutrons And Sodium Nuclei, S. B. Dabylova, Yu. N. Kopatch, N. A. Fedorov, D. N. Grozdanov, I. N. Ruskov, V. R. Skoy, K. Hramco, T. Yu. Tretyakova, S. K. Sakhiyev, R. B. Marzhokhov, E. P. Bogolyubov, V. I. Zverev, Yu. N. Barmakov

Eurasian Journal of Physics and Functional Materials

A study of the reaction of inelastic scattering of 14.1 MeV neutrons by 23 Na nuclei was carried out at the TANGRA facility using the tagged neutron method. In this work, the energies of visible . transitions are determined, the yields of . -quanta are obtained, the angular distributions of . -quanta for 23 Na are measured. The results obtained are in good agreement with the data of other published experimental works.

Mechanisms Of Formation Of Electron Hole Trap Centers In Likso4 Crystal, T. N. Nurakhmetov, Zh. M. Salikhodzha, A. M. Zhunusbekov, A. Zh. Kainarbay, D. H. Daurenbekov, T. T. Alibay, B. M. Sadykova, K. B. Zhangylyssov, B. N. Yussupbekova, D. A. Tolekov

Eurasian Journal of Physics and Functional Materials

The mechanisms of creation of electron-hole trapping centers in LiKSO4 have been investigated by the methods of vacuum and thermal activation spectroscopy. It is shown that electron-hole trapping centers are formed during the trappingof electronsbyanionic complexes and localizationofa holein the lattice in the form of the radical SO. . The appearance of phosphorescence at 3.0-3.1 eV, 2.6-2.7 eV and 2.3-2.4 4 eV confirms the creation of electron-hole trap centers.

Energy Transfer Of Intrinsic Electronic Excitation To Impurities In The Caso4-Mn System, T. N. Nurakhmetov, Zh. M. Salikhodzha, K. B. Zhangylyssov, A. M. Zhunusbekov, A. Zh. Kainarbay, D. H. Daurenbekov, Zh. Azmagambetova, B. M. Sadykova, B. N. Yussupbekova, T. T. Alibay, D. A. Tolekov, N. Tulebayeva

Eurasian Journal of Physics and Functional Materials

The nature of the impurity emission center and the energy transfer mechanisms from intrinsic electronic excitations to the Mn2+ impurity centers in the CaSO4 . Mn crystal have been investigated. The methods of vacuum ultraviolet, atomic absorption and luminescence spectroscopy are used in a wide temperature range from 5 K to 300 K. The energy transfer of intrinsic electronic excitations to impurity emission centers in CaSO4 . Mn has been detected.

Effect Of The Detonation Spraying Mode On The Tribological Properties Of Nicr-Al2o3 Coatings, B. K. Rakhadilov, D. B. Buitkenov, E. Kabdykenova, Zh. B. Sagdoldina, L. G. Zhurerova

Eurasian Journal of Physics and Functional Materials

The article presents the study results of detonation spraying parameters on the phase composition and tribological properties of NiCr-Al 2 O 3 powder coatings. The spraying was carried out at a ratio of the acetylene oxygen mixture O 2 /C 2 H2 =1.856. The detonation barrel filling volume with an explosive gas mixture varied from 30% to 68%. It is determined that the phase composition of the NiCr-Al 2 O 3 coatings varies depending on the degree of detonation barrel filling. With an increase in the detonation barrels filling volume, the intensity of the NiCr diffraction peaks is decreased, and …

Influence Of Pulsed Plasma Treatment On Phase Composition And Hardness Of Cr3c2-Nicr Coatings, D. N. Kakimzhanov, B. K. Rakhadilov, Yu. N. Tyurin, O. V. Kolisnichenko, L. G. Zhurerova, M. K. Dautbekov

Eurasian Journal of Physics and Functional Materials

In this study, the research results of the influence of pulsed plasma treatment on phase composition, hardness, and roughness of Cr 3 C 2 -NiCr coatings are presented. The Cr 3 C2 -NiCr coating was applied to substrate 12Kh18N10T stainless steel by detonation spraying method. To change the physical and mechanical properties of sprayed coating's surface layers, subsequent pulse plasma treatment was used. The pulse plasma treatment leads to changing the roughness of Cr 3 C2 -NiCr coating. The results of mechanical tests showed that after pulsed plasma treatment, the hardness of Cr 3 C 2 -NiCr coating is increased. …

Assessment Of Radiation Exposure In The Settlements Located In Stepnogorsk Area, D. S. Ibrayeva, M. N. Aumalikova, K. B. Ilbekova, M. M. Bakhtin, P. K. Kazymbet, Sh. S. Ibrayeva, K. Sh. Zhumadilov

Eurasian Journal of Physics and Functional Materials

The Stepnogorsk area Northern Kazakhstan has a long historymining activities. Mining activities have lots of environmental and health impacts. The aims of this study were to characterizing the general radiological situation of the area and evaluate radiation exposure by scenarios in settlements. In this study radiological assessment was performed for critical group living in the territory contaminated with radionuclides; working and studying at school located on territoryformer mining site. The annual dose burden is 2.5 mSv y .1 in Zavodskoy, 1.9 mSv y .1 in Kvartsitka and 3.6 mSv y .1 in Aqsu; and exposure from radon is around 11 …

Hybrid Deep Learning Architecture To Forecast Maximum Load Duration Using Time-Of-Use Pricing Plans, Jinseok Kim, Babar Shah, Ki Il Kim

All Works

Load forecasting has received crucial research attention to reduce peak load and contribute to the stability of power grid using machine learning or deep learning models. Especially, we need the adequate model to forecast the maximum load duration based on time-of-use, which is the electricity usage fare policy in order to achieve the goals such as peak load reduction in a power grid. However, the existing single machine learning or deep learning forecasting cannot easily avoid overfitting. Moreover, a majority of the ensemble or hybrid models do not achieve optimal results for forecasting the maximum load duration based on time-of-use. …

Terwilliger Algebras For Several Finite Groups, Nicholas Lee Bastian

Theses and Dissertations

In this thesis, we will explore the structure of Terwilliger algebras over several different types of finite groups. We will begin by discussing what a Schur ring is, as well as providing many different results and examples of them. Following our discussion on Schur rings, we will move onto discussing association schemes as well as their properties. In particular, we will show every Schur ring gives rise to an association scheme. We will then define a Terwilliger algebra for any finite set, as well as discuss basic properties that hold for all Terwilliger algebras. After specializing to the case of …

Quantum Symmetries In Noncommutative Geometry., Suvrajit Bhattacharjee Dr.

Doctoral Theses

No abstract provided.

Steep Sulfur Gradient In Cztsse Solar Cells By H2s-Assisted Rapid Surface Sulfurization, Teoman Taskesen, Devendra Pareek, Dirk Hauschild, Alan Haertel, Lothar Weinhardt, Wanli Yang, Timo Pfeiffelmann, David Nowak, Clemens Heske, Levent Gütay

Chemistry and Biochemistry Faculty Research

Sulfur/selenium grading is a widely used optimization strategy in kesterite thin-film solar cells to obtain a bandgap-graded absorber material and to optimize optical and electrical properties of the solar-cell device. In this work, we present a novel approach to introduce a [S]/([S] + [Se]) grading for Cu ZnSn(S,Se) solar cells. In contrast to commonly used methods with slow process dynamics, the presented approach aims to create a fast sulfurization reaction on the surface of pure selenide kesterite absorbers by using highly reactive H S gas and high sulfurization temperatures in a rapid flash-type process. With a combination of X-ray photoelectron …

Elemental Hyper-Accumulation In Mushrooms With A Focus On Arsenic, Walter Goessler

Sustainability Seminar Series

Mushrooms play an important role in the biogeochemical cycling of trace elements. They do neither belong to plants nor to animals but form their own kingdom. Some mushrooms live in symbiosis with plants or as parasites on other living organisms. Mushrooms are abundant worldwide. Although omnipresent, they only become noticeable when fruiting bodies are produced. Mushrooms are becoming a more important part of our diet and are used in various aspects of our life. They are used for antibiotics production, in the food industry(wine, cheese...) but also as biological pesticides. New applications cover plastics degradation and use as a leather …

Glacier Clear Ice Bands Indicate Englacial Channel Microbial Distribution, Gilda Varliero, Alexandra Holland, Gary L. A. Barker, Marian L. Yallop, Andrew G. Fountain, Alexandre M. Anesio

Geology Faculty Publications and Presentations

Distant glacial areas are interconnected by a complex system of fractures and water channels which run in the glacier interior and characterize the englacial realm. Water can slowly freeze in these channels where the slow freezing excludes air bubbles giving the ice a clear aspect. This ice is uplifted to the surface ablation zone by glacial movements and can therefore be observed in the form of clear surface ice bands. We employed an indirect method to sample englacial water by coring these ice bands. We were able, for the first time, to compare microbial communities sampled from clear (i.e. frozen …

Domestication Of Mediterranean Annual Pasture Legumes For Australian Farming Systems, P. G. H. Nichols, Angelo Loi, B. J. Nutt, R. Snowball, Clinton K. Revell

IGC Proceedings (1993-2023)

No abstract provided.

Going Native With Legumes In Rangeland Restoration, Cultivated Pasture And Prairies, Jim P. Muir, Twain J. Butler, W. D. Pitman, J. Lloyd‐Reilley, P. D. Maywauld, R. T. Cragar

IGC Proceedings (1993-2023)

No abstract provided.

Native Grasses Selected For Agriculture, Revegetation And Amenity Use In Tasmania, Australia, Doug A. Friend, P. L. Dolan

IGC Proceedings (1993-2023)

No abstract provided.

Development Of Pre‐Variety Germplasm Of Canadian Native Grassland Species, Bruce E. Coulman, J. Grant Mcleod, Paul G. Jefferson, Brent Wark

IGC Proceedings (1993-2023)

No abstract provided.

Study On Alkane Patterns Of Grassland Species From The Patagonian Steppe, A. Cesa, M. L. Bakker, C. B. Marinelli, R. E. Cepeda

IGC Proceedings (1993-2023)

No abstract provided.

A Climate Chronology, Sharon S. Tisher

School of Economics Faculty Scholarship

The most challenging of all endeavors in human history will likely be that of understanding the impact of our industrial and technological enterprises on the planet’s climate and ecosystems, and responding effectively to the threats posed by that impact. I began writing this chronology while developing a climate policy course at the University of Maine. It has grown substantially during the ensuing nine years, and continues to grow.

By juxtaposing developments in climate science, U.S. policy, and international policy over the previous two centuries, I hope to give the reader new insights into where we have been, where we are …

Antimony (V) Adsorption At The Hematite–Water Interface: A Macroscopic And In Situ Atr-Ftir Study, Jerzy Mierzwa, Rose Mumbi, Avedananda Ray, Sudipta Rakshit, Michael E. Essington, Dibyendu Sarkar

Agricultural and Environmental Sciences Faculty Research

The environmental mobility of antimony (Sb) is largely unexplored in geochemical environments. Iron oxide minerals are considered major sinks for Sb. Among the different oxidation states of Sb, (+) V is found more commonly in a wide redox range. Despite many adsorption studies of Sb (V) with various iron oxide minerals, detailed research on the adsorption mechanism of Sb (V) on hematite using macroscopic, spectroscopic, and surface complexation modeling is rare. Thus, the main objective of our study is to evaluate the surface complexation mechanism of Sb (V) on hematite under a range of solution properties using macroscopic, in situ …

Lions-Type Theorem Of The P-Laplacian And Applications, Yu Su, Zhaosheng Feng

School of Mathematical and Statistical Sciences Faculty Publications and Presentations

In this article, our aim is to establish a generalized version of Lions-type theorem for the p-Laplacian. As an application of this theorem, we consider the existence of ground state solution for the quasilinear elliptic equation with the critical growth.

Encryption And Decryption With A Raspberry Pi Device, Taylor Powell

Undergraduate Research Symposium

The functioning of our modern digital world relies heavily on the security of modern encryption algorithms and their resistance to systematic attempts to access secure information. For the 2020 Department of Computer Science’s Raspberry Pi Programming Competition, I decided to explore encryption and decryption techniques available to any user with some programming knowledge and a desire to secure information from unwanted access.

I developed a program which allows a user to select between three types of encryption algorithms: a Caesar Cipher, a Vigenère Cipher, and a Stream Cipher. I also gave the user the option to further secure their encrypted …

Women In Stem, Dyandra M. Johnson

Arkansas Women in STEM Conference

My poster is about the life of Katherine Johnson, its a summary of her achievements, educational background, and her family life. The purpose of my poster is to provide information about this amazing woman that was apart of STEM. I've found that she had accomplished a lot through using Mathematics, and how she contributed so much to NASA.

Making Inexpensive Drugs For The Treatment Of Human African Trypanosomiasis, Lou V A M. Gore Ms

Arkansas Women in STEM Conference

Neglected tropical diseases (NTDs) affect the world’s poorest population; mainly in Africa, Asia, and Latin America. According to the WHO, more than one billion people are affected by NTDs. The connection between these areas is the lack of proper sanitation, and the persistence of the diseases, trap the affected countries in the poverty and disease cycle.

African sleeping sickness, a prevalent NTD, is a parasitic infection caused by two parasites from the Trypanosoma brucei species and is transmitted by the tsetse fly or congenitally. The disease is manifested by fever, severe headaches, irritability, extreme fatigue, swollen lymph nodes, and aching …

Carrier-Free Chemo-Ptt/Pdt Ionic Nanomaterials For Combination Cancer Therapy, Samantha Macchi

Arkansas Women in STEM Conference

Herein, we describe a carrier-free combination nanodrug for treatment of cancer. In this work, we combined a photothermal compound and a chemotherapeutic drug using ionic liquid chemistry. We utilized a facile, one-step metathesis approach to replace the counter cation of a near infra-red (NIR) dye (photothermal agent) with a chemotherapeutic cation to synthesize an ionic material-based combination cancer therapy drug to deliver multiple mechanisms simultaneously. The nanodrugs were developed by using a reprecipitation method. The detailed photophysical properties of this new combination therapy molecule was investigated in ethanol solution as well as in nanoparticles forms in aqueous media. The singlet …

Undetermined Coefficients: A Fully Generalized Approach, Taylor Powell

Undergraduate Research Symposium

In this presentation, I outline the development of a fully-generalized solution of linear, non-homogeneous differential equations with constant coefficients and whose non-homogeneous function is any product of sinusoidal, exponential, and polynomial functions. This particular method does not require the reader to work with annihilator operators or additional related ODEs, and only requires an understanding of summation notation, matrix multiplication, and calculus. Additionally, this method provides a straightforward way to develop a program to implement the technique, and potentially reduces the time-complexity for solutions with comparisons to other methods.

Genetic Resources Of Rangeland Plants For Extreme Environment Conditions, N. I. Dzyubenko

IGC Proceedings (1993-2023)

No abstract provided.