Digital Commons Network^™

Mms Observations Of The Kelvin-Helmholtz Instability And Associated Ion Scale Waves, Rachel C. Rice

Doctoral Dissertations and Master's Theses

The detailed mechanisms coupling the solar wind to Earth's magnetosphere are not yet fully understood. Solar wind plasma is heated non-adiabatically as it penetrates the magnetosphere, and this process must span scale sizes. Reconnection alone is not able to account for the observed heating; other mechanisms must be at work. One potential process is the Kelvin-Helmholtz instability (KHI). The KHI is a convective instability which operates at the fluid scale in plasmas, but is capable of driving secondary process at smaller scales. Previous work has shown evidence of magnetic reconnection, various ion scale wave modes, mode conversion, and turbulence associated …

Pharmacological Extension Of Lifespan Via Mitochondrial Uncoupling In Drosophila Melanogaster, Analisa Taylor

Honors Capstones

No abstract provided.

Identifying Complex Adaptive Systems Using Quantitative Approaches At A Midsized Biotechnology Firm, Sean M. Sullivan

All Theses And Dissertations

Rapid technological progress is becoming more challenging for organizations to implement and manage. The traditional, hierarchical leadership models are often inadequate to cope with continuous change, and the inability to keep up with the latest advances can quickly imperil a company. In particular, the field of biotechnology is currently experiencing revolutionary advances. Where hierarchical leadership models lapse, complexity theory and complexity leadership theory may provide an alternative leadership model for successful organizational adaptation. However, much of the research surrounding complexity theory remains academic. Historical data from a biotechnology company was analyzed during a computer hardware and software upgrade to detect …

Polyaniline/Cobalt Nanoparticle Composite Films, Rifat Mahbub

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Polymer nanocomposites have been gaining attention because of the enhanced properties of the element materials it can offer. These composites have been used in biological sector as well as quantum computing and memory devices. These are also used as different kind of sensors. Polymer composites incorporated with magnetic nanoparticles can modify the magnetic property of the nanoparticles and that has huge potential to be used in different sort of applications.

This work aims to develop a polymeric nanocomposite incorporating a conducting polymer and magnetic nanoparticles. The influence of the conducting polymer on the magnetic property of the nanoparticles was investigated. …

Supportive Neighborhoods, Family Resilience And Flourishing In Childhood And Adolescence, Sheila Barnhart, Molly R. Bode, Michael C. Gearhart, Kathryn Maguire-Jack

Social Work Faculty Publications

Flourishing is linked with health and well-being in childhood and adulthood. This study applied a promotive factors model to examine how neighborhood assets might benefit child and adolescent flourishing by promoting family resilience. Using data from the combined 2018 and 2019 National Survey of Children’s Health, structural equation models tested direct and indirect relationships between neighborhood physical environment, neighborhood social cohesion, family resilience, and flourishing among 18,396 children and 24,817 adolescents. After controlling for multiple covariates that may influence flourishing, the models supported that higher levels of neighborhood social cohesion were directly associated with higher levels of flourishing adolescents, and …

Effects Of Temperature And Plant And Animal Diets On Metabolic Rate In The Juvenile Red Eared Slider (Trachemys Scripta Elegans), Taylor Macdonald, Sarah Bouchard

Undergraduate Honors Thesis Projects

Specific dynamic action (SDA) is the energy expended during ingestion, digestion, absorption, and assimilation of a meal, and is influenced by meal (type, size, composition, and temperature) and environmental temperature. Understanding the effect of meal type and environmental temperature on SDA in turtles is important in describing how T. s. elegans may acclimate with changing environmental temperatures. In this study, we conducted feeding trials in which we fed juvenile T. s. elegans duckweed and mealworm diets at 25°C and 30°C. We measured the rate of oxygen consumption as a proxy for metabolic rate after feeding for four 30 minute consecutive …

Impact Of Net Houses On The Natural Regulation Of The Populations Of Trialeurodes Vaporariorum (Homoptera: Aleyrodidae) And Tuta Absoluta (Lepidoptera: Gelechiidae), Two Major Tomato Pests In Kenya, Anaïs Chailleux, Junitor Chepkemoi, Julien M. Haran, Laure Benoit, Robert Copeland, Emilie Deletre

All Peer-Reviewed Publications

The abandonment of insecticide treatments to achieve sustainable crop production calls for a combination of methods to obtain satisfactory pest control. To this end, net houses and biological control are two promising methods, though we suspected that most natural enemies are blocked outside the net houses. In Kenya, tomato crops are particularly threatened by Trialeurodes vaporariorum (Westwood 1856) and Tuta absoluta (Meyrick, 1917) that are targets of most insecticide treatments in this country. We investigated in an on-farm experiment (i) the abundances of T. vaporariorum and T. absoluta in open fields and in net houses, (ii) the diversity of arthropod …

Effect Of Different Levels And Sizes Of Walnut Seed Residues On Phosphorus Availability And Alkaline Phosphatase Activity In Calcareous Soil, Sakar Abdulqadr Saheed, Shakar Jamal Aweez, Snowber Muhamad Ahmed

Baghdad Science Journal

A laboratory experiment has been carried out in the College of Science-University of Salahaddin to study the effect of different levels (0,5,10 and 15%) and sizes(250 and 1000µm) of walnut seeds residues and (160mg.kg-1) phosphorus fertilization on the concentration of phosphorus availability and alkaline phosphatase activity in calcareous soil during 15 and 30 days period of incubation, the experimental design in factorial complet randomize design (C.R.D) with three replications. The results indicated that the application of different levels of walnut seed residues decreases the concentration of phosphorus availability and alkaline phosphatase activity, however the results revealed that combination between levels …

Synthesis And Characterization Of New Benzothiazole-Derived Schiff Bases Metal Complexes, Wasan Abdul Razzaq Mahmood, Areej Kamal Assim Aldabbagh, Muhanned A. Mahmoud

Baghdad Science Journal

Nitrogen-comprising heterocyclic compounds and their derivatives have empirically been invaluable as therapeutic agents. Fundamentally, 4-chloro-6-nitro-2-amino-1,3-benzothiazole 1 was synthesized via bromination of 2-chloro-4-nitro aniline with ammonium thiocyanate. This new heterocyclic haloorganoamino-1,3-benzothiazole derivative, was a starting material, which condensed and tethered with three different aromatic aldehyde pendant arm in presence of ethanol and glacial acetic acid isolating an interesting sequence of tridentate Schiff bases 2-4. These compounds were used for complexation reactions in 1:1 (metal: ligand) stoichiometry to obtain heteroleptic Al(III), Ni (II) and K(I) benzothiazole chelates 5-7(a-c) of the type [Al(L)Cl2, Ni(L)Cl, K(L) {L = Schiff base derivatives}]. The newly synthesized …

Latina's Experiences Of Shared Parenting In The Context Of Intimate Partner Violence: A Phenomenological Study, Pisinee Dangwung

Dissertations

This dissertation presented a hermeneutic phenomenological study conducted with 12 Latina mothers who were survivors of intimate partner violence (IPV) considering or in a process of shared parenting with their former abusive partner. The purpose of this study was to explore the essence of shared parenting experiences among participants in the IPV context and examine how attachment style, adverse childhood experiences, and cultural values impacted their shared parenting decisions and processes. The study was guided by the theoretical frameworks of symbolic interactionism, intersectional feminism, and attachment. Findings indicated adverse childhood experiences and cultural values affected participants’ shared parenting decisions and …

Interactive Effects Of Major Insect Pest Of Watermelon On Its Yield In Wukari, Nigeria, Okrikata Emmanuel, Ogunwolu E. Oludele, Otabor J. Itohan, Ogunmola A. Oyewole

Baghdad Science Journal

Watermelon is known to be infested by multiple insect pests both simultaneously and in sequence. Interactions by pests have been shown to have positive or negative, additive or non additive, compensatory or over compensatory effects on yields. Hardly has this sort of relationship been defined for watermelon vis-à-vis insect herbivores. A 2-year, 2-season (4 trials) field experiments were laid in the Research Farm of Federal University Wukari, to investigate the interactive effects of key insect pests of watermelon on fruit yield of Watermelon in 2016 and 2017 using natural infestations. The relationship between the dominant insect pests and fruit yield …

Comparison Of Protein Concentration In Red And White Muscles In Two Species Of Bony Fish, Noor Makki Abd-Alsahb, Akeil Jameil Mansour, Sarmad Awad Mozan Al-Asadi

Baghdad Science Journal

The current study deals with estimating the protein concentration and the effect of fish weight on protein concentration values in red and white muscles in two different regions ( R1 : Anterior region lies 2 cm behind the head and R2: posterior region lies 2cm from caudal fin (in two types of bony fish, namely common carp (Cyprinus carpio) and Nile tilapia (Oreochromis niloticus). Samples were collected from Karmat Ali river- north of Basrah between October 2019 and February 2020. The protein was extracted using protein extraction buffer, the current study show that the average of protein concentration in red …

Protection Of Galvanized Steel From Corrosion In Salt Media Using Sulfur Nanoparticles, Rasha A. Jassim, Muna S. Sando, Ahlam M. Farhan

Baghdad Science Journal

The characteristics of sulfur nanoparticles were studied by using atomic force microscope (AFM) analysis. The atomic force microscope (AFM) measurements showed that the average size of sulfur nanoparticles synthesized using thiosulfate sodium solution through the extract of cucurbita pepo extra was 93.62 nm. Protecting galvanized steel from corrosion in salt media was achieved by using sulfur nanoparticles in different temperatures. The obtained data of thermodynamic in the presence of sulfur nanoparticles referred to high value as compares to counterpart in the absence of sulfur nanoparticles, the high inhibition efficiency (%IE) and corrosion resistance were at high temperature, the corrosion rate …

Check Out The Library, 2022 Spring Issue, Cal Poly Humboldt Library

Library Publications

Table of Contents

• Introduction
• Our First Cal Poly Humboldt Library Newsletter
• New Special Collections Website
• New Spaces & New Faces
• Our Students are Talking
• ImPRESSive Growth
• What’s New in the Makerspace & Digital Media Lab?
• Transformational Library Giving & Cal Poly Humboldt
• Transforming Lives
• Events

Physical Activity/Sport Performance And The Benefits Of Virtual Reality- A Systematic Review, Madeline Rushing

Research Papers

No abstract provided.

High School Students’ Math And Science Motivation Profiles: Stability And Relationship With Their Stem Career Aspirations, Jiali Zheng

Theses and Dissertations

Motivation to study mathematics and science is an important influencing factor of career aspirations in STEM fields which predicts STEM major choice in college and STEM careers after graduation. Using restricted data from a nationally representative sample HSLS:09, the current study identified U.S. high school students’ motivation profiles in mathematics and science courses in 9^th and 11^th grade, examined the stability of these profiles across the two time points, and studied the association between 11^th grade motivation profiles and STEM career aspirations. Differences between male and female students in motivation profiles, profile stability and career aspirations were …

Mediator Kinase Inhibitors For Breast Cancer Therapy, Xiaokai Ding

Theses and Dissertations

Breast cancers (BrCa) that overexpress oncogenic tyrosine kinase receptor HER2 are treated with HER2-targeting antibodies (such as trastuzumab) or small-molecule kinase inhibitors (such as lapatinib). However, most patients with metastatic HER2+ BrCa have intrinsic resistance and nearly all eventually become resistant to HER2-targeting therapy. Resistance to HER2-targeting drugs frequently involves transcriptional reprogramming associated with constitutive activation of different signaling pathways. We have investigated the role of CDK8/19 Mediator kinase, a regulator of transcriptional reprogramming, in the response of HER2+ BrCa to HER2-targeting drugs. Selective CDK8/19 inhibitors (senexin B and SNX631) showed synergistic interactions with lapatinib and trastuzumab in a panel …

Comparative Assessment Of The Fate And Toxicity Of Chemically And Biologically Synthesized Silver Nanoparticles Toward Juvenile Clams, Mercenaria Mercenaria, Amar Yasser Al-Rshim

Theses and Dissertations

Engineered nanomaterials (ENMs) with unique nanoscale properties, including novel optical behavior and superparamagnetic, are continually being developed for biomedical and industrial applications. In specific biomedical applications, ENMs are surface-functionalized using polymers, proteins, and other stabilizing agents to facilitate their resistance to salt-induced aggregation. Since their colloidal stability in high ionic-strength matrices, functionalized ENMs are anticipated to be persistent aquatic contaminants. Despite their potential environmental significance, the persistence of surface-functionalized ENMs as individually stabilized nanoparticles in marine environments is largely unknown. Further, few studies have investigated the fundamental factors that influence ENMs uptake and fate/transport processes in ecologically susceptible aquatic biota, …

Evaluation Of The Perceived Benefit Of A Psychiatric Resource For Parents Of Children With 22q11.2 Deletion Syndrome, Kayla Blankenship

Theses and Dissertations

The objective of this study was to assess the perceived utility of an educational resource booklet addressing the psychiatric manifestations and mental health considerations within 22q11.2 deletion syndrome (22q11.2DS).

Seventy-three parents of children with 22q11.2DS completed online surveys before and after reading the booklet. The surveys assessed personality factors and feelings of empowerment, worry, self-stigma, and ability to tolerate uncertainty.

Participants reported that the booklet was easy to understand, provided better understanding of 22q11.2DS and mental illness, answered questions about mental illness associated with the condition, improved knowledge of strategies for protecting the mental health of children with the condition, …

The Effects Of The Online Remediation Of Phonological Processing Deficits On Functional Reading Abilities In Students With Dyslexia, Fletcher Bowden

Theses and Dissertations

Dyslexia affects between 5% and 18% of Americans and is caused by difficulty with phonological processing. This study investigates the impact of an online intervention designed to remediate phonological processing deficits on reading accuracy, fluency, and comprehension. It also investigates changes to student self-concept and parent perceptions of their children’s reading attitudes and abilities as a result of the online intervention.

Ten students participated in the intervention; assessments were administered at the beginning and at the midpoint of the treatment. Scores in Phonological Processing and Alternate Phonological Processing, as measured by the CTOPP-2, demonstrated large to very large effect sizes, …

The Relation Between Adhd Symptoms And Alcohol And Marijuana Use Outcomes Among College Students: The Mediating Role Of Experiential Avoidance, William Joshua Bradley

Theses and Dissertations

Individuals with attention-deficit/hyperactivity disorder (ADHD) are at significantly greater risk for alcohol and marijuana misuse and abuse compared to their peers. College students with ADHD may be particularly vulnerable to problematic alcohol and marijuana use, given the widespread use and abuse of these substances by college students generally and liability associated with ADHD specifically. Experiential avoidance, or avoidance of unwanted thoughts, feelings, and other internal experiences, is positively associated with ADHD symptoms and substance use problems. However, it is unclear what role experiential avoidance plays in the relation between ADHD and alcohol and marijuana use. This study examined whether experiential …

Life In The Time Of Covid-19: The Everyday Impacts Of The Pandemic In Amman, Jordan, Patrick Mckenzie

Theses and Dissertations

The COVID-19 pandemic and the responses taken to combat it caused enormous changes to the everyday lives of people around the world. Jordan, in its early success against the virus and with its large refugee population, represents a unique country in which to study these everyday impacts. From May to August of 2021, I conducted ethnographic fieldwork in the Jordanian capital city of Amman while working with the refugee nongovernmental organization the Collateral Repair Project. In this thesis, I explore the COVID-19 Spectacle, examining the ways in which policies and discourses at the national and international scales bled into the …

The Role Of Force Dynamic Schemas In The Comprehension Of Causal Language, Dawson Petersen

Theses and Dissertations

The current study is an attempt to empirically test the predictions of Talmy’s (1988) force dynamics. Specifically, Talmy argues that causal sentences are understood by reference to basic image schemas, such as Starting and Stopping. While many of the predictions of other cognitive linguistic models, such as Lakoff and Johnson’s (1980) conceptual metaphor theory, have been tested empirically by psycholinguists (Fischer & Zwaan, 2008; Gibbs, 2006; Boroditsky & Ramscar, 2002), force dynamics has received very little empirical attention (I am only aware of Wolff & Song, 2003), in spite of its productivity in formal linguistics.

The current study aims to …

Graph Neural Network And Phylogenetic Tree Construction, Gaofeng Pan

Theses and Dissertations

Deep Learning had been widely used in computational biology research in past few years. A great amount of deep learning methods were proposed to solve bioinformatics problems, such as gene function prediction, protein interaction classification, drug effects analysis, and so on; most of these methods yield better solutions than traditional computing methods. However, few methods were proposed to solve problems encountered in evolutionary biology research. In this dissertation, two neural network learning methods are proposed to solve the problems of genome location prediction and median genome generation encountered in phylogenetic tree construction; the ability of neural network learning models on …

Sexual Health Education For Children With Neurodevelopmental Disorders: Genetic Counselor And Pediatrician Perspectives, Mary Catherine Smith

Theses and Dissertations

Many barriers prevent individuals with disabilities from receiving appropriate sexual health education (SHE), including deficits in socialcommunication skills and lack of resources and trained educators. There are few guidelines specifically addressing how to accommodate for providing SHE to individuals with disabilities. Healthcare professionals who are trained in working with adolescents with disabilities, such as pediatric genetic counselors, developmental-behavioral pediatricians (DBP), and neurodevelopmental disabilities (NDD) subspecialty pediatricians, could fill this gap. The purpose of the current study was to assess what informational items pediatric genetic counselors, DBP, and NDD subspecialty pediatricians felt were most essential to include in SHE for children …

The Effects Of Ionizing Radiation On Domestic Dogs: Ancestry And Genetic Structure Of Free-Roaming Dog Populations In Chernobyl, Ukraine, Gabriella Jean Spatola

Theses and Dissertations

This thesis is concerned with the effects of ionizing radiation on domestic dogs (Canis lupus familiaris) which were commonly used as laboratory subjects during the era of atomic bomb testing (1950s - 1980s). Early laboratory studies on radiation effects in dogs provided important foundations of knowledge for research that has more recently shifted to natural populations exposed to ionizing radiation from nuclear accidents. A unique group of free-roaming dogs reside in an environment polluted by radioactive contamination deposited during the Chernobyl nuclear disaster of 1986, providing one such opportunity to study the effects of ionizing radiation on dogs …

Infertility Education For Men With Cystic Fibrosis And Its Effects: Outlooks On Fertility And Birth Control, Allison Elizabeth Perez Szczepanski

Theses and Dissertations

Many men with Cystic Fibrosis (CF) are infertile; however, few studies have evaluated fertility outlook of men with CF since the advent of modulator therapy. As predicted survival and quality of life improve, family planning is an area of increased interest for the CF community. The current study surveyed men with CF to explore their outlook on fertility, family planning, and birth control use with the option to receive a home fertility test and follow-up interview with study staff.

Seventy-five men with CF completed the survey and 53 (71%) believed they were likely infertile. Most recalled learning about infertility between …

Adsorption Of Microcystins To Sediment Affects Their Bioavailability And Remediation, Ashley Womer

Theses and Dissertations

The freshwater harmful algae Microcystis spp produces a family of toxins called microcystins1. These species of algae are known to release microcystins from their cells directly into the surrounding water2. This creates an array of human health risks depending on the fate and transport of the toxins in the water column3,4. Risk modelling and previous literature has shown that sediment is a sink for free microcystin, microcystin can be stably adsorbed to sediment for hundreds of years, and its adsorption to sediment is determined by the sediment adsorption partitioning coefficient (Kd)5,6,7. In this work it is hypothesized that the sediment …

Associations Between Child Characteristics And Maternal Mental Health In Families Of Children With Autism, Fragile X Syndrome, And Autism Associated With Fragile X Syndrome, Tiffany Nicole Worley

Theses and Dissertations

The present study examined the association between various child characteristics and maternal mental health concerns in three high-risk groups of mothers ± those of children with non-syndromic autism spectrum disorder (NSASD), mothers of children with fragile X syndrome (FXS), and mothers of children with fragile X syndrome and autism (FXS+ASD). Research has shown that mothers of children with NSASD and FXS are thought to share a degree of genetic vulnerability to mental health concerns it is key to examine the various other factors that may contribute to difficulties within the family system and maternal stress, depression, and anxiety.

Participants for …

Functional Facets Of Intergenic Hairpin Structures In Genus Caulobacter, Geetha Saarunya Clarke

Theses and Dissertations

DNA replication, recombination and repairs maintain bacterial genome stability. But these processes may also induce genome rearrangements leading to inter andintra chromosomal structural variations. Genus Caulobacter undergoes extensive genome rearrangements. Genomic studies in bacteria usually focus on the codingregions, but there is important information present in the intergenic DNA spaces inaddition to the regulatory elements involved in transcription. Recently, Ely published a new model for recombination in genus Caulobacter with simultaneousloss and gain of genes resulting from preferential recombination at non- homologous regions flanked by regions of homology. In my dissertation, I observedand catalogued hairpin structures at known sites of …