Digital Commons Network^™

In Vitro Corrosion And Biocompatibility Behavior Of Cocrmo Alloy Manufactured By Laser Powder Bed Fusion Parallel And Perpendicular To The Build Direction, Masoud Atapour, Saber Sanaei, Zheng Wei, Mohammadali Sheikholeslam, Jeffrey D. Henderson, Ubong Eduok, Yara K. Hosein, David W. Holdsworth, Yolanda S. Hedberg, Hamid Reza Ghorbani

Chemistry Publications

Biomedical cobalt-chromium-molybdenum alloys (CoCrMo) are frequently used for orthopedic implant and dental materials exposed to mechanical stressors, such as wear and cyclic load. Due to the high demand for customizable implant shapes, these alloys are increasingly manufactured by additive manufacturing methods such as laser powder bed fusion (LPBF). LPBF results in different microstructures and surface roughness as a function of the building direction. This study investigated the corrosion resistance, bioactivity, biocompatibility, and microstructure of LPBF CoCrMo (low carbon content, heat-treated) in the XY (perpendicular) and XZ (parallel) plane of the building direction for as-printed (as-received) and abraded surfaces. A distinct …

Power And Politics: The Case Of Urbanization And River Channel Change, Peter Ashmore

Geography & Environment Presentations

Gradual urbanization of a watershed in Toronto, Canada, over 60+ years resulted in major channel changes. The temporal and spatial extent of channel widening are predictable from new analysis tracking changes in total stream power along the river system as urban land cover extended across the watershed, and also produced very high energy large flood events responsible for major channel change. The analysis is a geomorphically-satisfying, quasi-experimental test of theory of river channel change. But it misses important elements of the full trajectory of change that are not physically predictable. Treating urbanization as a neutral physical variable of changing watershed …

Evaluating River Morphology Change With A Geomorphic Form Variation Approach, Corey Dawson, Peter Ashmore, Robert Corry

Geography & Environment Publications

Geomorphic river design strives for natural resilience by encouraging geomorphic form complexity and morphological processes linked to greater habitat diversity. Increasing availability of high-resolution topographic data and spatial feature mapping methods provide advantages for morphological analysis and river restoration planning. We propose and evaluate an approach to quantifying topographic variability of geomorphic form and pixel-level surface roughness resulting from channel planform geometry differences using spatially continuous variety computation applied to component metrics including flow direction, aspect and planform curvature. We define this as the geomorphic form variation (GFV) approach and found it scalable, repeatable and a multi-stage analytical metric for …

A Reference Framework For Variability Management Of Software Product Lines, Saiqa Aleem, Luiz Fernando Capretz, Faheem Ahmed

Electrical and Computer Engineering Publications

Variability management (VM) in software product line engineering (SPLE) is introduced as an abstraction that enables the reuse and customization of assets. VM is a complex task involving the identification, representation, and instantiation of variability for specific products, as well as the evolution of variability itself. This work presents a comparison and contrast between existing VM approaches using “qualitative meta-synthesis” to determine the underlying perspectives, metaphors, and concepts of existing methods. A common frame of reference for the VM was proposed as the result of this analysis. Putting metaphors in the context of the dimensions in which variability occurs and …

Scheduling Electric Vehicle Charging For Grid Load Balancing, Zhixin Han, Katarina Grolinger, Miriam Capretz, Syed Mir

Electrical and Computer Engineering Publications

In recent years, electric vehicles (EVs) have been widely adopted because of their environmental benefits. However, the increasing volume of EVs poses capacity issues for grid operators as simultaneously charging many EVs may result in grid instabilities. Scheduling EV charging for grid load balancing has a potential to prevent load peaks caused by simultaneous EV charging and contribute to balance of supply and demand. This paper proposes a user-preference-based scheduling approach to minimize costs for the user while balancing grid loads. The EV owners benefit by charging when the electricity cost is lower, but still within the user-defined preferred charging …

Summative Evaluation For Cal Poly Humboldt's 2022 Summer Algebra Institute, Rose Francia, Christine Castro, Irene Gonzalez-Herrera, Samantha Diel, Miguel Sagrero

IdeaFest 2023

For the second consecutive summer, Cal Poly Humboldt's CSU Summer Algebra Institute's (SAI) goal was aimed at demystifying Science, Technology, Engineering, Arts, and Mathematics (STEAM) related projects, majors, and careers, to further increase Humboldt, Del Norte, and Mendocino County BIPOC (6th-12th grades) students interests in pursuing majors and careers in STEAM, and minimize learning gaps in mathematics. Students who enrolled in the virtual 2022 SAI, a 4-week program, completed a minimum of 57 hour intensive individualized Mathematics course using EdReady, engaged in 19 days of culturally relevant STEAM curriculum, and participated in workshops on College & Career Preparation.

African Presence In The Ancient New World, Garrett Spruiell

IdeaFest 2023

Within this research project, I'll be presenting a controversial topic that many today deem as unchallengeable due to the influence from the history books the colonizers of our country wrote to indoctrinate us with. From this investigation, I intend to analyze conflicting theories so as to narrow down the plausibility of pre-Columbian transoceanic travel between Africa and the Americas. My goal with this project is to elevate African voices and perspectives, to show the public the possibility of alternative truths, as well as spread a sense of skepticism towards our Western history books.

Bird Diversity In Arcata, California: A Study On Urban Influence, Brittany Ocheltree

IdeaFest 2023

In this study, the primary goal was to observe the effects of urbanization on bird species diversity and composition of native and non-native species in Arcata, California. Methods include fixed radius 75-meter point counts for ten minutes, within thirty predetermined study sites, where I counted bird species and the abundance of birds, landscape features (e.g., building density), along with noting any human activity that may occur. I hypothesized that non-native species would increase with increasing building density. In conjunction with that species diversity would decrease with building density.

Biological Profiles: An Analysis On The Applicability And Implications Of Traditional And New Methods In Forensic Anthropology, Jazmin Borrayo

IdeaFest 2023

In forensics, commonly used when conducting an assessment of skeletal remains is the implementation of a biological profile. The key elements that typically form the basic biological profile are age, ancestry, sex, and stature. These components consist of further methods that comprise the estimation process and are essential in identification. Within recent years, there has been a rise in attention to the use and application of certain methods. This project analyzes the applicability and implications of traditional methods commonly used in forensic anthropology when conducting biological profiles as well as examines the emergence of new methods in the field.

Self-Determination Theory And Fragile X Syndrome, Marcus Romero

IdeaFest 2023

This study provides insight into the Self-Determination Theory with a participant with Fragile X syndrome and Autism Spectrum Disorder. This study utilized a single-subject research design which measured the exercised performance by looking at walking distance, push-ups, and curl-ups over five weeks.

Polygenic Scores Ignore Development And Epigenetics, Dramatically Reducing Their Value, David S. Moore

Pitzer Faculty Publications and Research

Polygenic scores cannot elucidate the mechanisms that produce behavioral phenotypes (including “intelligence”). Therefore, they are unlikely to yield helpful interventions. Moreover, they are poor predictors of individuals’ developmental outcomes. Burt’s critique is well-supported by the details of molecular biology. Specifically, experiences affect epigenetic factors that influence phenotypes via how the genome functions, a fact that lends support to Burt’s conclusions.

Strangers In The Blind: Identifying Appropriate Mentees And Mentors For Waterfowl Hunter Recruitment, Matthew Hinrichs, M. P. Vrtiska, M. P. Gruntarod, C. J. Chizinski

School of Natural Resources: Faculty Publications

No abstract provided.

Long Increasing Subsequences, Hannah Friedman

HMC Senior Theses

In my thesis, I investigate long increasing subsequences of permutations from two angles. Motivated by studying interpretations of the longest increasing subsequence statistic across different representations of permutations, we investigate the relationship between reduced words for permutations and their RSK tableaux in Chapter 3. In Chapter 4, we use permutations with long increasing subsequences to construct a basis for the space of ��-local functions.

Originalism V. Dynamic Constitutionalism: Implications Of Religious Beliefs On Constitutional Interpretation, Rev. Tj Denley

University of Maryland Law Journal of Race, Religion, Gender and Class

No abstract provided.

Moving Constructive Alignment Beyond The Curriculum: Embedding Mental Health And Wellbeing Into The Uk Engineering Student Experience, India Palmer, Nicky Knowles, Jane Andrews, Robin Clark, Gill Cooke, Graeme Knowles

Practice Papers

This paper addresses the tricky question of how the Engineering Curriculum can be better designed so as to nurture and improve the mental health of university engineering students. Since the end of the Pandemic, the UK has seen an increase in the numbers of young people aged 18-25 self-reporting mental health problems (Young Minds, 2023). Taking a wider perspective, there has been a rise of 450% in the numbers of young people informing UCAS that they have a mental health problem over the last decade (NUS, 2022). Yet, Engineering Education has the lowest rate of self-declared mental health problems on …

A Conceptual Framework For Knowledge Exchange In A Wildland Fire Research And Practice Context, Colin B. Mcfayden, Lynn M. Johnston, Douglas G. Woolford, Colleen George, Den Boychuk, Daniel Johnston, B. Mike Wotton, Joshua M. Johnston

Statistical and Actuarial Sciences Publications

No abstract provided.

Invasion Dynamics Of The European Collared-Dove In North America Are Explained By Combined Effects Of Habitat And Climate, Yiran Shao, Danielle Ethier, Simon Bonner

Statistical and Actuarial Sciences Publications

Global biodiversity is increasingly threatened by the spread of invasive species. Understanding the mechanisms influencing the initial colonization and persistence of invaders is therefore needed if conservation actions are to prevent new invasions or strive to slow their spread. The Eurasian Collared-Dove (Streptopelia decaocto, EUCO) is one of the most successful avian invasive species in North America; however, to our knowledge, no study has simultaneously examined the role that climate-matching, human activity, directional propagation, and local density have in this invasion process. Our research expands upon a cellular-automata-based hierarchical model developed to assess directional invasion dynamics to further quantify the …

Solar Cells, Lambert W And The Logwright Functions, Prabhat Lankireddy, Sibibalan Jeevanandam, Aditya Chaudhary, P. C. Deshmukh, Ken Roberts, S. R. Valluri

Physics and Astronomy Publications

Algorithms that calculate the current-voltage (I-V) characteristics of a solar cell play an important role in processes that aim to improve the efficiency of a solar cell. I-V characteristics can be obtained from different models used to represent the solar cell, and the single diode model is a simple yet accurate model for common field implementations. However, the I-V characteristics are obtained by solving implicit equations, which involve repeated iterations and inherent errors associated with numerical methods used. Some methods use the Lambert W function to get an exact explicit formula, but often causes numerical overflow problems. The present work …

Modelling Of Covid-19 Using Fractional Differential Equations, Rishi Patel, P. Sainani, M. Brar, R. Patel, X. Li, J. Drozd, F. A. Chishtie, A. Benterki, T. C. Scott, S. R. Valluri

Physics and Astronomy Publications

In this work, we have described the mathematical modeling of COVID-19 transmission using fractional differential equations. The mathematical modeling of infectious disease goes back to the 1760s when the famous mathematician Daniel Bernoulli used an elementary version of compartmental modeling to find the effectiveness of deliberate smallpox inoculation on life expectancy. We have used the well-known SIR (Susceptible, Infected and Recovered) model of Kermack & McKendrick to extend the analysis further by including exposure, quarantining, insusceptibility and deaths in a SEIQRDP model. Further, we have generalized this model by using the solutions of Fractional Differential Equations to test the accuracy …

The Role Of R-Modes In Pulsar Spindown, Pulsar Timing And Gravitational Waves, Varenya Upadhyaya, Xiyuan Li, Xiyang Zhang, S. R. Valluri

Physics and Astronomy Publications

Pulsars are fast spinning neutron stars that lose their rotational energy via various processes such as gravitational and magnetic radiation, particle acceleration and mass loss processes. This dissipation can be quantified by a spin-down equation that measures the rate of change of the frequency as a function of the rotational frequency itself. We explore the pulsar spin-down and consider the spin-down equation upto the seventh order in frequency. This seventh order term accounts for energy loss due to the gravitational radiation caused by a current type quadrupole in the pulsar due to r-modes. We derive the rotational frequency due to …

Suitup: Addressing Employee Retention, Satisfaction, And Scaling, Melia Furst, Lauren Jones, Ananya Pagadala

Miller Center Fellowship

This research paper delves into the complex dynamics of employee retention and company growth within the context of SuitUp, a social enterprise (SE) focused on innovative virtual and in-person business competitions, providing coaching and mentorship. Utilizing a mixed-method approach, including surveys, interviews, and participant observation, our study addresses key questions related to employee retention, opportunities for support, and the broader implications for work-life balance in remote settings. The study identifies the critical role of passion among SuitUp employees, emphasizing the need for clear growth opportunities and a well-established work-life balance for sustained engagement. Drawing on the organization's mission and context, …

Future Of Great Salt Lake Survey, Lisa W. Welsh, Joanna Endter-Wada, Karin M. Kettenring, Anna Mcentire

Reports

The Future of Great Salt Lake Survey was conducted in fall 2022 when state and global attention on Great Salt Lake was ramping up, following record lows of the elevation of lake water levels. In the survey, we asked Utahns their opinions on securing water for Great Salt Lake and focused on strategies that individuals, local communities, and the state of Utah could pursue. When it comes to how water is used and managed in Utah, there are multiple actors and institutions who all make decisions and have authority or ability to take different actions. While the state of …

Approximations Of Practice And Equity: Surveying The Spaces, Bima Sapkota, Carrie Lee, Liza Bondurant, Heather Howell

CoE Publications

No abstract provided.

The Artificially Intelligent Trolley Problem: Understanding Our Criminal Law Gaps In A Robot Driven World, Jake Feiler

UC Law Science and Technology Journal

Not only is Artificial Intelligence (AI) present everywhere in people’s lives, but the technology is also now capable of making unpredictable decisions in novel situations. AI poses issues for the United States’ traditional criminal law system because this system emphasizes mens rea’s importance in determining criminal liability. When AI makes unpredictable decisions that lead to crimes, it will be impractical to determine what mens rea to ascribe to the human agents associated with the technology, such as AI’s creators, owners, and users. To solve this issue, the United States’ legal system must hold AI’s creators, owners, and users strictly liable …

I3@Usd Fall 2023, University Of San Diego

I3@USD: Magazine for Shiley-Marcos School of Engineering

02 | Not Your Average Engineer

04 | Beyond Ones and Zeros

05 | Advancing Mutual Interests

06 | Darkness Turns to Light

07 | Honoring Sam Burt

08 | Memories. Milestones. Marvels.

14 | A Long Way From Home

15 | News Briefs

16 | Faculty Achievements

18 | Alumni Notes

22 | Showcase Innovators

23 | Career Outcomes

24 | Class of 2023

Utilizing The Classical Christian Study Of Latin To Promote Intentionality, Erin Lamont

Master of Arts in Classical Studies

It is well known that the study of Latin increases English vocabulary, helps one understand grammar, raises standardized test scores, and helps one learn other languages. As modern education sees itself as an agent for change and social reform set on reconstructing society, fewer schools are offering Latin to students. Of those that do offer it, many are veering away from the traditional approach which has a goal of being able to read and connect with the writing of the great thinkers of the past while utilizing a methodology that focuses on grammar and syntax. This paper looks at three …

Math And The Moon Activity Plan, Admin Stem For Success

STEM for Success Showcase

No abstract provided.

Basic Math Terms And Properties, Admin Stem For Success

STEM for Success Showcase

Basic Math Terms

In a math equation or sentence, the operator identifies the action taken. The equal sign shows the relationship that the expressions on the two sides are equal in value.

Arithmetic And Geometric Series, Admin Stem For Success

STEM for Success Showcase

Math:

-Introducing the concept of arithmetic and geometric series/discussing the differences

-Multiplying, adding, dividing, subtracting, exponents

Monty Hall, Admin Stem For Success

STEM for Success Showcase

No abstract provided.