Physical Sciences and Mathematics | Open Access Articles

Mgrre_Thinsections_Mgrre-104_12, Mgrre

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Mgrre_Thinsections_Mgrre-107_3, Mgrre

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Mgrre_Thinsections_Mgrre-110_8, Mgrre

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Mgrre_Thinsections_Mgrre-114_2, Mgrre

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Mgrre_Thinsections_Mgrre-114_1, Mgrre

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Mgrre_Thinsections_Mgrre-114_6, Mgrre

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Mgrre_Thinsections_Mgrre-114_13, Mgrre

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Mgrre_Thinsections_Mgrre-112_10, Mgrre

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Mgrre_Thinsections_Mgrre-104_6, Mgrre

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Mgrre_Thinsections_Mgrre-105_9, Mgrre

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Mgrre_Thinsections_Mgrre-104_15, Mgrre

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Mgrre_Thinsections_Mgrre-105_15, Mgrre

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Mgrre_Thinsections_Mgrre-106_2, Mgrre

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Mgrre_Thinsections_Mgrre-109_7, Mgrre

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Mgrre_Thinsections_Mgrre-111_2, Mgrre

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Hybrid Feature Selection Based On Principal Component Analysis And Grey Wolf Optimizer Algorithm For Arabic News Article Classification, Osama Ahmad Alomari, Ashraf Elnagar, Imad Afyouni, Ismail Shahin, Ali Bou Nassif, Ibrahim Abaker Hashem, Mohammad Tubishat

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The rapid growth of electronic documents has resulted from the expansion and development of internet technologies. Text-documents classification is a key task in natural language processing that converts unstructured data into structured form and then extract knowledge from it. This conversion generates a high dimensional data that needs further analusis using data mining techniques like feature extraction, feature selection, and classification to derive meaningful insights from the data. Feature selection is a technique used for reducing dimensionality in order to prune the feature space and, as a result, lowering the computational cost and enhancing classification accuracy. This work presents a …

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Exploring Misinformation Campaigns And How To Defend Against Them, Michelle S. Kuralt

Theses and Dissertations

Misinformation campaigns can have very real and lasting effects. Misinformation has been known to impact elections, create vaccine hesitancy, and increase polarization within societies. This paper reviewed existing literature regarding misinformation research, collected information from research participants to discern factors which may contribute to an increased susceptibility to misinformation, and examined Rule Based Training and a training program which utilized both rules and mindfulness to ascertain if these training programs might be effective in reducing participant susceptibility to misinformation.

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Technical Note: On Uncertainties In Plant Water Isotopic Composition Following Extraction By Cryogenic Vacuum Distillation, Haoyu Diao, Philipp Schuler, Gregory R. Goldsmith, Rolf T. W. Siegwolf, Matthias Saurer, Marco M. Lehmann

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Recent studies have challenged the interpretation of plant water isotopes obtained through cryogenic vacuum distillation (CVD) based on observations of a large 2H fractionation. These studies have hypothesized the existence of an H-atom exchange between water and organic tissue during CVD extraction with the magnitude of H exchange related to relative water content of the sample; however, clear evidence is lacking. Here, we systematically tested the uncertainties in the isotopic composition of CVD-extracted water by conducting a series of incubation and rehydration experiments using isotopically depleted water, water at natural isotope abundance, woody materials with exchangeable H, and organic materials …

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Microbial Ecology Of A Shallow Alkaline Hydrothermal Vent: Strýtan Hydrothermal Field, Eyjafördur, Northern Iceland, Katrina I. Twing, L. M. Ward, Zachery K. Kane, Alexa Sanders, Roy Edward Price, H. Lizethe Pendleton, Donato Giovannelli, William J. Brazelton, Shawn E. Mcglynn

Geosciences: Faculty Publications

Strýtan Hydrothermal Field (SHF) is a submarine system located in Eyjafördur in northern Iceland composed of two main vents: Big Strýtan and Arnarnesstrýtan. The vents are shallow, ranging from 16 to 70 m water depth, and vent high pH (up to 10.2), moderate temperature (Tmax ∼70°C), anoxic, fresh fluids elevated in dissolved silica, with slightly elevated concentrations of hydrogen and methane. In contrast to other alkaline hydrothermal vents, SHF is unique because it is hosted in basalt and therefore the high pH is not created by serpentinization. While previous studies have assessed the geology and geochemistry of this site, the …

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Electromagnetism In Quark Matter At Intermediate Densities, Efrain J. Ferrer

Physics & Astronomy Faculty Publications

Several anomalous electromagnetic effects that can take place in quark matter at low temperatures and intermediate densities will be discussed. The anomalous transport properties of the spatially inhomogeneous phase of quark matter known as the Magnetic Dual Chiral Density Wave (MDCDW) phase will be reviewed. Going beyond mean-field approximation, it will be shown how linearly polarized electromagnetic waves that penetrate the MDCDW medium mix with the phonon fluctuations to give rise to two hybridized modes of propagation called axion polaritons. Finally, some possible implications of these results for the astrophysics of neutron stars will be indicated.

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Helium Nanodroplets As An Efficient Tool To Investigate Hydrogen Attachment To Alkali Cations, Siegfried Kollotzek, José Campos-Martínez, Massimiliano Bartolomei, Fernando Pirani, Lukas Tiefenthaler, Marta I. Hernández, Teresa Lázaro, Eva Zunzunegui-Bru, Tomás González-Lezana, José Bretón, Javier Hernández-Rojas, Olof E. Echt, Paul Scheier

Faculty Publications

We report a novel method to reversibly attach and detach hydrogen molecules to positively charged sodium clusters formed inside a helium nanodroplet host matrix. It is based on the controlled production of multiply charged helium droplets which, after picking up sodium atoms and exposure to H₂ vapor, lead to the formation of Na_m⁺(H₂)_n clusters, whose population was accurately measured using a time-of-flight mass spectrometer. The mass spectra reveal particularly favorable Na⁺(H₂)_n and Na₂⁺(H₂)_n clusters for specific “magic” numbers of attached hydrogen molecules. …

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The Minority In The Minority, Black Women In Computer Science Fields: A Phenomenological Study, Blanche' D. Anderson

Doctoral Dissertations and Projects

The purpose of this transcendental phenomenological study was to describe the lived experiences of Black women with a bachelor’s, master’s, or doctoral degree in computer science, currently employed in the United States. The theory guiding this study was Krumboltz’s social learning theory of career decision-making, as it provides a foundation for understanding how a combination of factors leads to an individual’s educational and occupational preferences and skills. This qualitative study answered the following central research question: What are the lived experiences of Black women with a bachelor’s, master’s, or doctoral degree in computer science, currently employed in the United States? …

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Lost At Sea: The Nintendo Gamecube’S Failure And The Transformation Of An Industry 1996-2006, Izsak Kayne Barnette

Doctoral Dissertations and Projects

The history of video games is critically underdeveloped. Long simmering under a veil of academic neglect, video games have long been denied the sort of academic relevance of their sister industries: books, film, music, and TV. It is long-past time that such neglect was addressed. Most historical analyses of games begin with their origins in the 1950s, discuss their ubiquity during the heyday of Atari or Nintendo, or rope in modern views of games as tools of diversity and inclusion. Very few studies pay attention to the rather ugly adolescent years of the game industry, its motorcycle-jacket wearing, rebellious teenage …

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Laboratory Evaluation And Field Feasibility Of Micro-Encapsulated Insecticide Effect On Rhodnius Prolixus And Triatoma Dimidiata Mortality In Rural Households In Boyaca, Colombia, Lidia Gual-Gonzalez, Manuel Medina, Cesar Valverde-Castro, Virgilio Beltran, Rodrigo Caro, Omar Triana-Chavez, Melissa Nolan Ph.D., Mph, Omar Cantillo-Barraza

Faculty Publications

Chagas disease is a neglected vector-borne zoonosis caused by the parasite Trypanosoma cruzi that is primarily transmitted by insects of the subfamily Triatominae. Although control efforts targeting domestic infestations of Rhodnius prolixus have been largely successful, with several regions in Boyacá department certified free of T. cruzi transmission by intradomicile R. prolixus, novel native species are emerging, increasing the risk of disease. Triatoma dimidiata is the second most important species in Colombia, and conventional control methods seem to be less effective. In this study we evaluated the efficacy and usefulness of micro-encapsulated insecticide paints in laboratory conditions and its …

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Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability, Shahé Shnorhokian, Hani Mitri

Journal of Sustainable Mining

Variations in rock mass properties are well-established in rock mechanics and underground mining. The literature is replete with methods of assessing them and determining values that are used in design or numerical analysis. In this paper, a simplified 3D model is constructed for a tabular orebody in the Canadian Shield and instability is quantified using the ”brittle shear ratio” criterion to calculate the volume at risk. A 1-4-7 stope pillar sequence is implemented on four active levels, and three variations in the properties of the host formation are assessed. It is observed that the locations of ore at risk follow …

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Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review, Johana Borda, Robinson Torres

Journal of Sustainable Mining

Thiourea, as an alternative medium, is one of the most promising leaching agents for gold recovery by its commercial benefits and research challenges associated with performance and environmental impacts. This review article describes the operational conditions for the use of Thiourea vs cyanide, its chemistry, limitations, toxicity factors, environment, and recovery processes. Although thiourea gold extraction processes have not been applied on a large scale due to the instability of the reagent, its potential to overcome the limitations of cyanide is attractive to the process; with pH, potential, oxidant dosage, and temperature control, solubilized gold thiourea species are achieved. These …

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Panel Destressing Strategies For Remnant Pillar Extraction, Isaac Vennes, Hani Mitri

Journal of Sustainable Mining

Large-scale panel destressing is a rockburst mitigation technique employed in deep hard rock mines during remnant pillar extraction. Panels are choke blasted in the pillar footwall to cutoff the far-field major stress in the mining area and deviate them around the pillar. In this study, the effects of panel geometry and far-field stress magnitude are investigated. Destress blast performance is assessed by measuring change to the energy release rate (ERR) of all mining steps during the extraction of a simplified remnant pillar due to destressing. It is demonstrated that the energy release rate (ERR) of critical stopes is reduced by …

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Design And Fabrication Of A Low-Cost Dip Coating System For Depositing Homogeneous And Transparent Zno Thin Films, Asaad S. Yasir, Basheer M. Hussein, Ammar S. Hameed, Noor J. Ridha, Firas K. Mohamad Alosfur, Khawla J. Tahir, Rajaa A. Madlol

Al-Bahir

ZnO has a resistivity of up to 104 Ω cm-1 in most cases. Nevertheless, by increasing the layer thickness, the resistivity decreases as well, resulting in greater current transport. The dip coating system was developed to prepare the ultra-thin film, it relied on a controller, stepper motor and some low-cost recycled materials. Thin films of ZnO were successfully deposited on indium tin oxide substrates. The effects of the dipping cycles were investigated. Dipping processes were applied several times (1, 2, and 3) for the same concentrations (0.1) M to obtain homogeneous thin films. X-ray diffraction showed that the structure of …

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Mgrre_Thinsections_Mgrre-88_30, Mgrre

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Mgrre_Thinsections_Mgrre-88_31, Mgrre

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Full-Text Articles in Physical Sciences and Mathematics

Mgrre_Thinsections_Mgrre-104_12, Mgrre

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Mgrre_Thinsections_Mgrre-107_3, Mgrre

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Mgrre_Thinsections_Mgrre-110_8, Mgrre

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Mgrre_Thinsections_Mgrre-114_2, Mgrre

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Mgrre_Thinsections_Mgrre-114_1, Mgrre

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Mgrre_Thinsections_Mgrre-114_6, Mgrre

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Mgrre_Thinsections_Mgrre-114_13, Mgrre

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Mgrre_Thinsections_Mgrre-112_10, Mgrre

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Mgrre_Thinsections_Mgrre-104_6, Mgrre

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Mgrre_Thinsections_Mgrre-105_9, Mgrre

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Mgrre_Thinsections_Mgrre-104_15, Mgrre

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Mgrre_Thinsections_Mgrre-105_15, Mgrre

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Mgrre_Thinsections_Mgrre-106_2, Mgrre

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Mgrre_Thinsections_Mgrre-109_7, Mgrre

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Mgrre_Thinsections_Mgrre-111_2, Mgrre

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Hybrid Feature Selection Based On Principal Component Analysis And Grey Wolf Optimizer Algorithm For Arabic News Article Classification, Osama Ahmad Alomari, Ashraf Elnagar, Imad Afyouni, Ismail Shahin, Ali Bou Nassif, Ibrahim Abaker Hashem, Mohammad Tubishat

All Works

Exploring Misinformation Campaigns And How To Defend Against Them, Michelle S. Kuralt

Theses and Dissertations

Technical Note: On Uncertainties In Plant Water Isotopic Composition Following Extraction By Cryogenic Vacuum Distillation, Haoyu Diao, Philipp Schuler, Gregory R. Goldsmith, Rolf T. W. Siegwolf, Matthias Saurer, Marco M. Lehmann

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Microbial Ecology Of A Shallow Alkaline Hydrothermal Vent: Strýtan Hydrothermal Field, Eyjafördur, Northern Iceland, Katrina I. Twing, L. M. Ward, Zachery K. Kane, Alexa Sanders, Roy Edward Price, H. Lizethe Pendleton, Donato Giovannelli, William J. Brazelton, Shawn E. Mcglynn

Geosciences: Faculty Publications

Electromagnetism In Quark Matter At Intermediate Densities, Efrain J. Ferrer

Physics & Astronomy Faculty Publications

Faculty Publications

The Minority In The Minority, Black Women In Computer Science Fields: A Phenomenological Study, Blanche' D. Anderson

Doctoral Dissertations and Projects

Lost At Sea: The Nintendo Gamecube’S Failure And The Transformation Of An Industry 1996-2006, Izsak Kayne Barnette

Doctoral Dissertations and Projects

Faculty Publications

Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability, Shahé Shnorhokian, Hani Mitri

Journal of Sustainable Mining

Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review, Johana Borda, Robinson Torres

Journal of Sustainable Mining

Panel Destressing Strategies For Remnant Pillar Extraction, Isaac Vennes, Hani Mitri

Journal of Sustainable Mining

Design And Fabrication Of A Low-Cost Dip Coating System For Depositing Homogeneous And Transparent Zno Thin Films, Asaad S. Yasir, Basheer M. Hussein, Ammar S. Hameed, Noor J. Ridha, Firas K. Mohamad Alosfur, Khawla J. Tahir, Rajaa A. Madlol

Al-Bahir

Mgrre_Thinsections_Mgrre-88_30, Mgrre

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Mgrre_Thinsections_Mgrre-88_31, Mgrre

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