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Fault Tolerant Robotics Using Active Diagnosis Of Partially Observable Systems And Optimized Path Planning For Underwater Message Ferrying, Devon M. Webb Dec 2022

Fault Tolerant Robotics Using Active Diagnosis Of Partially Observable Systems And Optimized Path Planning For Underwater Message Ferrying, Devon M. Webb

Theses and Dissertations

Underwater robotic vehicles are used in a variety of environments that would be dangerous for humans. For these vehicles to be successful, they need to be tolerant of a variety of internal and external faults. To be resilient to internal faults, the system must be capable of determining the source of faulty behavior. However many different faults within a robotic vehicle can create identical faulty behavior, which makes the vehicles impossible to diagnose using conventional methods. I propose a novel active diagnosis method for differentiating between faults that would otherwise have identical behavior. I apply this method to a communication …

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Sitting Time And Insulin Resistance In 6,931 United States Adults: The Role Of Abdominal Adiposity, Kayla Marie Parker Dec 2022

Sitting Time And Insulin Resistance In 6,931 United States Adults: The Role Of Abdominal Adiposity, Kayla Marie Parker

Theses and Dissertations

This cross-sectional investigation of 6,931 U.S. adults examined the relationship between sitting time and insulin resistance. A primary objective was to evaluate how this relationship was mediated by the following variables: age, sex, race, year of assessment, cigarette smoking, physical activity, body mass index (BMI), and waist circumference. Self-reported sitting time, measured in minutes per day, was the exposure variable. Insulin resistance, indexed by the homeostatic model assessment of insulin resistance (HOMA-IR), was the outcome variable. Data were used from the 2011-2018 National Health and Nutrition Examination Survey (NHANES). Results showed a strong, positive association between sitting time and insulin …

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African American Family Members’ Needs And Experiences During A Loved One’S End-Of-Life, Kelley Obringer Dec 2022

African American Family Members’ Needs And Experiences During A Loved One’S End-Of-Life, Kelley Obringer

Theses and Dissertations

This study aimed to explore African American family members’ needs and experiences during their loved one’s end-of-life. In Chapter 1, a literature review was conducted to review the current state of the literature regarding African American family members’ needs and experiences during their loved one’s end-of-life. Chapter 2 includes a qualitative exploratory study of African American family members’ needs and experiences during their loved one’s end-of-life. The study sample consisted of family members of African Americans being cared for through services provided by an outpatient palliative care facility in the Southeastern United States. Family members answered five open-ended interview questions …

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Arab American Muslims’ Attitudes Toward Seeking Mental Health Services: The Roles Of Acculturation, Religion, And Cultural Beliefs, Tharwah Alzoubi Dec 2022

Arab American Muslims’ Attitudes Toward Seeking Mental Health Services: The Roles Of Acculturation, Religion, And Cultural Beliefs, Tharwah Alzoubi

Theses and Dissertations

The purpose of this study was to identify the relationship between acculturation, religion, cultural beliefs, and attitudes toward seeking mental health services among Arab American Muslims. A total of 280 participants were surveyed for this study. Regression analysis was conducted to explore relationships among the variables; the alpha level was set at .05. The first research hypothesis was accepted as it showed statistical significance in the relationship between attitudes toward seeking mental health services and demographic variables. The standardized regression coefficients, or beta coefficients ranged from -.008 for gender to .24 for marital status, R=.31 (P<.05). Two variables were significant at the .05 level (marital status, and health insurance). The second hypothesis was also accepted as it showed relationship between attitudes toward mental health services and acculturation, religion and cultural beliefs; the standardized regression coefficients, or beta coefficients ranged from .05 for cultural beliefs to a -.25 for religion, R=.44 (P<.05). The variables of acculturation and religion were significant at the .01 level. Cultural beliefs were not significant at .05 level.

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Dynamic Soil Properties In The Lower Rio Grande Valley: Understanding Responses Of Infiltration Rate, Bulk Density, Aggregate Stability To Different Tillage Practices, Temiloluwa Faith Awotoye Dec 2022

Dynamic Soil Properties In The Lower Rio Grande Valley: Understanding Responses Of Infiltration Rate, Bulk Density, Aggregate Stability To Different Tillage Practices, Temiloluwa Faith Awotoye

Theses and Dissertations

Dynamic Soil Properties (DSPs) are soil properties that change in response to both natural and human-caused interruptions and pressures such as agro-based and wildland management. These soil properties can transform for months or even years in response to the farm use and management procedures. This research project investigates the relationship between different dynamic soil physical properties and tillage practices in the Texas Hidalgo sandy clay loam benchmark soil series. Data analyses was done to compare the effect of tillage to these soil physical properties and build a discussion about relationships between on-farm practices to other aspects of farm viability. We …

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Dynamic Soil Properties In The Lower Rio Grande Valley: Carbon And Nitrogen Responses To Different Tillage Practices, Luzyannet Ballesteros Gonzalez Dec 2022

Dynamic Soil Properties In The Lower Rio Grande Valley: Carbon And Nitrogen Responses To Different Tillage Practices, Luzyannet Ballesteros Gonzalez

Theses and Dissertations

There has been increased attention in utilizing agriculture for carbon sequestration. Soil carbon and nitrogen are two dynamic soil properties (DSPs) that are indicators of soil health and function and have overlapping cycles. These soil properties change frequently as a result of environmental conditions and agricultural management practices. This study focuses on the impact of tillage practices in unirrigated agricultural fields in Hidalgo and Willacy counties located in South Texas on Hidalgo Sandy Clay Loam; With a particular focus on Soil Total Carbon (TC), Soil Inorganic Carbon (SIC), Permanganate Oxidizable Carbon (POXC), Carbon and Nitrogen ratio (C:N), Soil Organic Matter …

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Green Synthesis Of Spiro Compounds And The Phytochemical Investigation Of Diethyl Ether Fraction Of Camu-Camu (Myrciaria Dubia) Leaves, Judith Anane Dec 2022

Green Synthesis Of Spiro Compounds And The Phytochemical Investigation Of Diethyl Ether Fraction Of Camu-Camu (Myrciaria Dubia) Leaves, Judith Anane

Theses and Dissertations

There are a lot of lucrative plant species found in the Amazon and camu-camu (Myrciaria dubia (H.B.K.) Mc Vaugh) is distinct among them. This is due to its exceptional Vitamin C content which varies from 1600 to 6112 mg/100g of pulp. Besides the fruits which is popularly used, different parts of camu-camu plants including the stems, leaves, seeds, barks, and roots are also traditionally used in folklore practices for treating various ailments and diseases and research has showed the presence of antioxidant, antimicrobial, anticancer, anti-inflammatory agents present in these parts. In this study, the characterization of a bioactive compound, …

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Monsters & Men, Christopher Ernest Garcia Dec 2022

Monsters & Men, Christopher Ernest Garcia

Theses and Dissertations

Monsters & Men is a collection of poetry and illustrations that explores the complex emotions associated with masculinity, grief, and personal development. I achieve this by heavily reflecting on my relationship with my late father and using this medium as an outlet to express my trauma in a healthy manner. How we perceive ourselves as men, and what is possible, is not reflected enough in society and I aim to be a proponent in stimulating the conversation revolving around men’s mental health. Men and the patriarchy impose themselves on others to the point where we need to address the unethical …

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The Mediating Role Of Gun Attitudes In The Association Between Dsm-5 Posttraumatic Stress Disorder Symptom Clusters, And Gun Ownership In Young Hispanic Adults With Exposure To Interpersonal Trauma, Vanessa Gonzalez Dec 2022

The Mediating Role Of Gun Attitudes In The Association Between Dsm-5 Posttraumatic Stress Disorder Symptom Clusters, And Gun Ownership In Young Hispanic Adults With Exposure To Interpersonal Trauma, Vanessa Gonzalez

Theses and Dissertations

Despite growing interest in gun attitudes and gun ownership among United States citizens, the current body of literature is limited and tends to focus on white non-Hispanic individuals. The present study examined the effect of interpersonal trauma-related PTSD symptoms on gun attitudes and protective gun ownership. The associations between experiencing PTSD symptoms, gun attitudes, and protective gun ownership were examined in a sample of 176 young Hispanic adults (n = 127 women, n = 49 men) with exposure to interpersonal trauma. Specifically, the mediating role of positive attitudes towards guns in the associations between the four clusters of DSM-5 …

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Latinas In Stem Education: Paying It Forward, Evangelina Guillen Dec 2022

Latinas In Stem Education: Paying It Forward, Evangelina Guillen

Theses and Dissertations

Hispanic female students are the minority population when it comes to taking higher level classes in the Science Technology Engineering and Math fields. According to Hinojosa, Rapaport, Jaciw, and Zacamy (2016), “STEM fields are defined here as majors in computer and information sciences, engineering and engineering technologies, biological and biomedical sciences, math and statistics, physical sciences, and science technologies” (p. 3). Traditionally, more boys enroll in STEM courses than girls. Hispanic and minority students, specifically Hispanic women, have been underrepresented in STEM education fields and careers. Why does STEM education matter for Hispanic female students? Because it gives Hispanic students …

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An Assessment Of Physical And Microbial Dynamic Properties Sensitive To Tillage Practices In Hidalgo Sandy Clay Loam Soils, Rocio N. Hernandez Dec 2022

An Assessment Of Physical And Microbial Dynamic Properties Sensitive To Tillage Practices In Hidalgo Sandy Clay Loam Soils, Rocio N. Hernandez

Theses and Dissertations

Mechanized tillage is known to impact the dynamic physical, biological and chemical properties of a given soil, and as a result, can cause systematic harm to the soil’s function (Alam et al., 2014). The aim of this study is to assess how a series of land management tillage practices will impact dynamic physical and biological soil health parameters such as aggregation, carbon, respiration, and enzymatic activity (β-glucosidase). According to Acir et al (2020), the aforementioned soil parameters are both co-influenced and dependent, indicating a response to tillage is likely. A total of 198 samples of Hidalgo series soils were collected …

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The Impact Of Supervisory Training And Workload Upon The Licensed Specialist In School Psychology Supervisors’ Perception Providing Field-Based Supervision To Interns In A Public-School Setting, Christopher L. King Dec 2022

The Impact Of Supervisory Training And Workload Upon The Licensed Specialist In School Psychology Supervisors’ Perception Providing Field-Based Supervision To Interns In A Public-School Setting, Christopher L. King

Theses and Dissertations

Quality supervision is essential for developing high-performing professionals in the mental health profession. Licensed Specialists in School Psychology (LSSP) in Texas can begin supervising LSSP Interns after three years of unsupervised field experience. Workloads for LSSP supervisors can be highly diverse, and LSSP supervision training can be limited. The present study explored the impact of workload and lack of supervision training on the supervisors’ perceived ability to supervise Licensed Specialist in School Psychology (LSSP) interns in Texas public school settings. Using a quantitative cross-sectional survey design, 146 LSSP supervisors with at least three years of unsupervised field experience, and one …

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The Role Of Facial Emotion Recognition Abilities In Intimate Partner Violence Perpetration, Margot Martinez Dec 2022

The Role Of Facial Emotion Recognition Abilities In Intimate Partner Violence Perpetration, Margot Martinez

Theses and Dissertations

Interpreting facial affects is a key aspect in everyday human interaction and intimate partner relationships. Being unable to accurately recognize facial expressions may prompt an inappropriate reaction from the viewer. Limited literature suggests perpetrators of intimate partner violence are less able to accurately recognize facial expressions. The previous body of literature regarding facial affect recognition (FAR) abilities in intimate partner violence failed to take into account the role empathy and emotion regulation play in the relationship between intimate partner violence and FAR abilities. In addition, prior studies investigated these differences in primarily White Non-Hispanic individuals limiting the generalizability of their …

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Special Education Teachers’ Self-Efficacy During The Times Of A Global Pandemic, Vanessa G. Leal Dec 2022

Special Education Teachers’ Self-Efficacy During The Times Of A Global Pandemic, Vanessa G. Leal

Theses and Dissertations

This quantitative dissertation aims to describe and compare the perception of special education teachers' self-efficacy amid the COVID-19 pandemic using the practice of distance and their self-efficacy pre-pandemic using face-to-face instruction and describe the perceived valuable supports teachers received from educational leaders during the pandemic and considered valuable. The study population includes special education teachers teaching in inclusive settings before and during the pandemic in grades 6–12 in districts located in South Texas. The current study's data was analyzed using a two-way factorial analysis of variance, with both factors including repeated measures within subjects (2 x 3). A descriptive statistical …

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Examination Of The Attitudes Towards Substance Use Treatment Approaches By Substance Use Professionals, Cameron Lacy Ortega Dec 2022

Examination Of The Attitudes Towards Substance Use Treatment Approaches By Substance Use Professionals, Cameron Lacy Ortega

Theses and Dissertations

This quantitative study focuses on substance use professionals and students who are seeking employment in substance use treatment or support services. The substance use treatment profession started as a group of people who were supporting each other in recovery through abstinence based practices and has developed in to a recognized profession with multiple methods of treatment approaches. Abstinence based treatment has been and continues to be the primary method of treatment preferred in the United States. Since the 1980, harm reduction increased in application in the profession, but remains a less popular method of treatment. This study examines substance use …

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Investigating The Relationship Between Dissolved Oxygen And Nitrate Concentration As A Proxy For Marine Ecosystem Health, Natalia M. Moore Dec 2022

Investigating The Relationship Between Dissolved Oxygen And Nitrate Concentration As A Proxy For Marine Ecosystem Health, Natalia M. Moore

Theses and Dissertations

Coastal environments such as seagrass meadows span a wide range of spatial scales and can experience disturbances that cause rapid shifts to ecosystem dynamics. Increased pressure to the coastal zone has highlighted the need for constant, real-time monitoring to monitor current ecosystem status. A custom, low cost, high resolution, in situ sensor network was designed and tested in the Lower Laguna Madre, Texas to characterize primary productivity in seagrass meadows through gradient patterns of dissolved oxygen concentration, with the purpose of determining whether seagrass or phytoplankton were the more dominant primary producer. There was a distinct vertical and horizontal gradient …

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Effects Of Roundup Exposure On Redox Status, Cellular Apoptosis, And Antioxidant And Osmoregulatory Enzyme Expressions In Goldfish (Carassius Auratus), Md Imran Noor Dec 2022

Effects Of Roundup Exposure On Redox Status, Cellular Apoptosis, And Antioxidant And Osmoregulatory Enzyme Expressions In Goldfish (Carassius Auratus), Md Imran Noor

Theses and Dissertations

Intense anthropogenic activities of industrialized nations dramatically increase environmental pollution. This study focused on the effects of Roundup, a glyphosate-based herbicide, exposure (low- and high-dose: 0.5 and 5 mg/L for 2 weeks) on dinitrophenyl protein (DNP), nitrotyrosine protein (NTP), superoxidase dismutase (SOD), catalase (CAT), Na+ /K+ - ATPase (NKA), and renin expressions, and cellular apoptosis in the gills and kidneys of goldfish. Histopathological analysis showed widespread tissue damage in both gills and kidneys. Immunohistochemical analysis provided insights into the expression of molecular biomarkers in tissues. Fish exposed to Roundup exhibited a significant (P<0.05) upregulation in DNP, NTP, SOD, and CAT expressions, and apoptotic nuclei in both tissues. Additionally, exposure to Roundup significantly increased renin expression in kidneys and decreased NKA expression in gills. Overall, our results suggest that exposure to Roundup induces oxidative/nitrative stress and cellular apoptosis and alters osmoregulatory and antioxidant systems which may lead to impaired physiological functions in goldfish.

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Growing Up Butchona On The Texas-Mexico Border A Marimacha Memoir, Julietta Rivera Dec 2022

Growing Up Butchona On The Texas-Mexico Border A Marimacha Memoir, Julietta Rivera

Theses and Dissertations

Growing Up Butchona on the Border is a queer, Latina memoir that takes place on the Texas-Mexico border. This thesis is a journey in words and pictures that spans throughout an immigration crisis, a worldwide pandemic and the fallout that follows a world-wide lockdown; eventually leading down the rocky road to self-discovery. The thesis opens with a fictional account of Torita Torcida, a seven-year-old Honduran immigrant that makes her way across the Texas-Mexico border with her mother only to be ripped away from her when the truck they were smuggled in is seized by border patrol. Images and words come …

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Influence Of Glucose And Lactic Acid On Macrophage Transition In Pancreatic Tumors, Anyssa A. Rodriguez Dec 2022

Influence Of Glucose And Lactic Acid On Macrophage Transition In Pancreatic Tumors, Anyssa A. Rodriguez

Theses and Dissertations

Pancreatic cancer is the seventh leading cause of cancer-related mortality worldwide. According to the American Cancer Society, it is the eleventh most common cancer diagnosed in both men and women in the United States. Pancreatic ductal adenocarcinoma (PDAC) comprises 90% of all pancreatic malignancies and is associated with poor clinical outcome because of late diagnosis and resistance to therapy. In addition, studies show that the tumor microenvironment has become an emerging interest in cancer research due to its complex components and unique characteristics that aid in cancer initiation, maintenance, and progression. Accumulating evidence signifies that tumor associated macrophages (TAMs) play …

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Weather Parameters Influencing The Incidence Of Citrus Canker Caused By Aw Strain In The Rio Grande Valley, Amit Sharma Dec 2022

Weather Parameters Influencing The Incidence Of Citrus Canker Caused By Aw Strain In The Rio Grande Valley, Amit Sharma

Theses and Dissertations

Citrus canker caused by bacterium Xanthomonas citri subsp. citri (Xcc) seriously affects the citrus industry by making the fruit unmarketable due to unsightly lesions on the fruit. Canker caused by Aw strain of Xcc was reported in the citrus trees located in the residential areas of the Rio Grande Valley (RGV). Canker severity differs amongst cultivars/varieties, and it is influenced by prevailing environmental conditions. Multiple regression modeling of the disease incidence with the environmental variables such as temperature, humidity, windspeed, wind gust, and rainfall was performed to understand the environmental conditions that are favorable for spread of citrus …

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Numerical Simulation Of Vibration - Based Piezoelectric Energy Harvester For Shape Comparison, Adriana Rosas Dec 2022

Numerical Simulation Of Vibration - Based Piezoelectric Energy Harvester For Shape Comparison, Adriana Rosas

Theses and Dissertations

This work investigates the shape optimization of piezoelectric energy harvesters subjected to mechanical vibration using ABAQUS/Standard software. Three piezoelectric energy harvesters with different dimensions but the same areas were created to identify if model dimensions have an impact on the output voltage. The models were tested at different speeds to create an output voltage. Once the output voltages were obtained, the results were compared with each other to find if shape optimization on piezoelectric energy harvesters has an impact on scavenging energy from mechanical vibrations.

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Water Hardness Removal By Electrochemical Precipitation In A Continuous Flow Condition Using Conductive Concrete As Cathode, Tahsin Tareque Dec 2022

Water Hardness Removal By Electrochemical Precipitation In A Continuous Flow Condition Using Conductive Concrete As Cathode, Tahsin Tareque

Theses and Dissertations

This study focuses on the electrochemical precipitation (EP) process to reduce excess water hardness from the Lower Rio Grande Valley (LRGV) tap water using electrically conductive concrete as cathode in a continuous flow condition. LRGV tap water is extremely hard with hardness more than 350 mg/L as CaCO3. Humans can pleasantly consume water with hardness less than 150 mg/l as CaCO3 according to World Health Organization (WHO). Hard water is also known to cause mechanical problems to boilers and heat exchangers. In this process, electricity is passed through electrodes submerged in electrolyte, which causes an alkaline environment around the cathode …

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Feasibility Analysis Of Embedding Optical Fiber Sensor Into Additively Manufactured Part, Mahmudul Hasan Porag Dec 2022

Feasibility Analysis Of Embedding Optical Fiber Sensor Into Additively Manufactured Part, Mahmudul Hasan Porag

Theses and Dissertations

The research tried to examine the viability of the embedment of optical fiber sensors in Additively built components, packaging the sensors within the components, and characterizing the sensors for sensing a specified measurement. Optical fiber sensors are popular due to their small size, resilience against electromagnetic radiation, and reliability in potentially dangerous conditions. Embedding fibers inside a product allows for the monitoring of critical areas, allowing for preemptive action in the case of a breakdown. Coupons of Inconel 718 were made using laser powder-bed fusion (LPBF), with the fabrication settings tuned to determine whether such a development was possible. After …

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Integrating Model-Based Systems Engineering Industry Transformations For Workforce Development, Wilma Analisa Ankobiah Dec 2022

Integrating Model-Based Systems Engineering Industry Transformations For Workforce Development, Wilma Analisa Ankobiah

Theses and Dissertations

This study explores whether MBSE industry workforce requirements are being satisfied by the academic curricula of US institutions. Using an industry survey, which is highlighted in Chapter 3, identifies the existing perception of MBSE from various industries and explores the MBSE needs of professionals, such as tools concepts and languages. It examines how industry professionals perceive MBSE, the advantages and challenges of MBSE use and the preferred MBSE tools, languages and knowledge of concepts deemed necessary to ensure project success in the respective industry sectors. Results of phase 1 industry survey will summarize the current MBSE concepts, tools and languages …

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Dismembering Monstrous Metaphors In Latinx Speculative Fiction, Danielle Garcia-Karr Dec 2022

Dismembering Monstrous Metaphors In Latinx Speculative Fiction, Danielle Garcia-Karr

Theses and Dissertations

U.S. public discourse and popular media are rife with monstrous metaphors of Latinxs. This thesis argues that these gothic monstrous metaphors construct an affective economy of fear, which results in material violence and the devastation of Latinx lives. I further argue that to intervene within this affective economy, Latinx authors write speculative fiction, employing critical race methodologies, to negotiate monstrosity in relation to citizenship. In other words, speculative Latinx authors disidentify with monsters and enact epistemic disobedience, problematizing the known and naturalized and delinking Latinx people from monstrous metaphors to interrupt cycles of fear and violence. In exploring this metaphoric …

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Healthcare In A Time Of Crisis: An Investigation Of The Association Between Socioeconomic Status, Counties, And Covid-19, Jorge F. Contreras Dec 2022

Healthcare In A Time Of Crisis: An Investigation Of The Association Between Socioeconomic Status, Counties, And Covid-19, Jorge F. Contreras

Theses and Dissertations

The COVID-19 pandemic has stressed social structural institutions such as hospitals, schools, the economy, and governmental bodies (local, state, and federal), exacerbating existing health inequality. Fundamental Cause Theory (FCT) provides a framework for understanding which factors drive such inequality, but its primary focus is on within-group variation. By highlighting the role of fundamental causes as systems of exposure, the Systems-of-Exposure (SOE) approach expands on FCT to account for variation more directly between populations. I performed a Qualitative Comparative Analysis (QCA) of county-level data from Texas and California to test the utility of SOE in assessing the impact of a pandemic …

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Intensa: Writings In English And Spanish From A Feminist Immigrant, Nubia Sarahi Reyna Melendez Dec 2022

Intensa: Writings In English And Spanish From A Feminist Immigrant, Nubia Sarahi Reyna Melendez

Theses and Dissertations

INTENSA: WRITINGS IN ENGLISH AND SPANISH FROM A MEXICAN FEMINIST is a bilingual work written in hybrid literature. The writings, in both English and Spanish, are free prose poetry and tell the story of its narrator through a feminist and immigrant point of view coming from a overwhelmingly majority catholic country, religion that does not view men and women as equals. The thesis details the narrator's life through a feminist point of view as well as her relationship with her mother, her personal relationships, what it means to be an immigrant and what it is like for her, and many …

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Latinx Parents’ Experiences Accessing Their Children’S Instruction And Resources Amidst The Covid-19 Pandemic, Elisa Coy Clark Dec 2022

Latinx Parents’ Experiences Accessing Their Children’S Instruction And Resources Amidst The Covid-19 Pandemic, Elisa Coy Clark

Theses and Dissertations

The purpose of this case study is to build awareness of the Latinx school parents’ experiences during the COVID-19 pandemic. This case study also explores how one’s cultural intuition can help advocate for the Latinx parents and their school children during a novel time. To find this information, I interviewed 7 parents and found the emerging themes that helped answer these two questions. In this case study I found that school families encountered a language barrier, struggled with computer literacy, were expected to help provide instruction, and that some parents were able to support their children after receiving teacher support. …

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Navigating Through A Pandemic (The Unknown): The Effects Of Synchronous Learning For Online And In Person Students On Achievement Scores In Reading And Math In A Private Catholic School In South Texas, Israel Martinez Jr. Dec 2022

Navigating Through A Pandemic (The Unknown): The Effects Of Synchronous Learning For Online And In Person Students On Achievement Scores In Reading And Math In A Private Catholic School In South Texas, Israel Martinez Jr.

Theses and Dissertations

In the Spring of 2020, a wide world pandemic, specifically COVID-19, slammed the door on what we defined as normal life. COVID-19 and its associated pandemic exposed more explicitly great inequities such as access to devices, platforms, and/or places to do schoolwork outside schools in education systems (Fullan, 2020). It also interrupted international travel, it devastated economic growth, and it disrupted schooling globally (Harris & Jones, 2020). In the Summer of 2020, a Catholic school in South Texas set a plan in place to provide a 100% synchronous way of learning for students in elementary grades 1 through 8 to …

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Grapefruit Peel Biochar Applications For Immobilizing Copper And Lead In Soil, Michael Alfredo Navarro Dec 2022

Grapefruit Peel Biochar Applications For Immobilizing Copper And Lead In Soil, Michael Alfredo Navarro

Theses and Dissertations

This study investigated the efficacy of grapefruit peel (GP) derived biochar materials (two pyrolysis temperatures 450°C and 800°C) as a potential adsorbent to immobilize heavy metal (copper and lead) in a local sandy loam clay soil. A batch adsorption test with heavy metal concentrations at 50 mg L-1, and 100 mg L-1 revealed that soil itself had the highest immobilization percentage compared to the GP biochars. A soil column experiment was conducted to determine how much the GP biochar samples and the tested soil will exhibit adsorptive characteristics for heavy metals when 50 ml of 50 mg L-1 copper or …

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