Physical Sciences and Mathematics Commons^™

Iot Based Virtual Reality Game For Physio-Therapeutic Patients, K. Martin Sagayam, Shibin D, Helen Dang, Mohd Helmy Abd Wahab, Radzi Ambar

Faculty Works: MCS (1984-2023)

Biofeedback therapy trains the patient to control voluntarily the involuntary process of their body. This non-invasive and non-drug treatment is also used as a means to rehabilitate the physical impairments that may follow a stroke, a traumatic brain injury or even in neurological aspects within occupational therapy. The idea behind this study is based on using immersive gaming as a tool for physical rehabilitation that combines the idea of biofeedback and physical computing to get a patient emotionally involved in a game that requires them to do the exercises in order to interact with the game. This game is aimed …

Singlet Fission In A Hexacene Dimer: Energetics Dictate Dynamics, Samuel N. Sanders, Elango Kumarasamy, Kealan J. Fallon, Matthew Y. Sfeir, Luis M. Campos

Publications and Research

Singlet fission (SF) is an exciton multiplication process with the potential to raise the efficiency limit of single junction solar cells from 33% to up to 45%. Most chromophores generally undergo SF as solid-state crystals. However, when such molecules are covalently coupled, the dimers can be used as model systems to study fundamental photophysical dynamics where a singlet exciton splits into two triplet excitons within individual molecules. Here we report the synthesis and photophysical characterization of singlet fission of a hexacene dimer. Comparing the hexacene dimer to analogous tetracene and pentacene dimers reveals that excess exoergicity slows down singlet fission, …

On The Classification Of Duality Webs For Graded Quivers, Sebastían Franco, Azeem Hasan, Xingyang Yu

Publications and Research

We study the m-graded quiver theories associated to CY (m+2)-folds and their order (m + 1) dualities. We investigate how monodromies give rise to mutation invariants, which in turn can be formulated as Diophantine equations characterizing the space of dual theories associated to a given geometry. We discuss these ideas in general and illustrate them in the case of orbifold theories. Interestingly, we observe that even in this simple context the corresponding Diophantine equations may admit an infinite number of seeds for m ≥ 2, which translates into an infinite number of disconnected duality webs. Finally, …

"Lagrangian Disks" In M-Theory, Sebastián Franco, Sergei Gukov, Sangmin Lee, Rak-Kyeong Seong, James Sparks

Publications and Research

While the study of bordered (pseudo-)holomorphic curves with boundary on Lagrangian submanifolds has a long history, a similar problem that involves (special) Lagrangian submanifolds with boundary on complex surfaces appears to be largely overlooked in both physics and math literature. We relate this problem to geometry of coassociative submanifolds in G₂ holonomy spaces and to Spin(7) metrics on 8-manifolds with T² fibrations. As an application to physics, we propose a large class of brane models in type IIA string theory that generalize brane brick models on the one hand and 2d theories T[M₄] on …

Causal Effect Random Forest Of Interaction Trees For Learning Individualized Treatment Regimes In Observational Studies: With Applications To Education Study Data, Luo Li

CGU Theses & Dissertations

Learning individualized treatment regimes (ITR) using observational data holds great interest in various fields, as treatment recommendations based on individual characteristics may improve individual treatment benefits with a reduced cost. It has long been observed that different individuals may respond to a certain treatment with significant heterogeneity. ITR can be defined as a mapping between individual characteristics to a treatment assignment. The optimal ITR is the treatment assignment that maximizes expected individual treatment effects. Rooted from personalized medicine, many studies and applications of ITR are in medical fields and clinical practice. Heterogeneous responses are also well documented in educational interventions. …

A Multinational Study Of The Etiology And Clinical Teleology Of Moral Evaluations Of Patient Behaviors, Anna Yu Lee

CGU Theses & Dissertations

This dissertation is a collection of four studies which collectively explore a hypothesized construct of ‘moral evaluation of patient behaviors’ (MEPB) as a driver of health professionals’ readiness to interact humanistically with their patients. In these studies, ‘humanistic interactions’ refer to the non-technical, intangible skills and factors of clinical competence; the factors specifically explored in these studies were compassion toward patients, self-efficacy for treating patients, and optimism toward patient treatment. For the purpose of specificity, all factors were examined as they pertained to patients with substance use disorders. Survey data from a convenience sample of 524 health professionals (i.e. physicians, …

Spectral Analysis Of Complex Dynamical Systems, Casey Lynn Johnson

CGU Theses & Dissertations

The spectrum of any differential equation or a system of differential equations is related to several important properties about the problem and its subsequent solution. So much information is held within the spectrum of a problem that there is an entire field devoted to it; spectral analysis. In this thesis, we perform spectral analysis on two separate complex dynamical systems. The vibrations along a continuous string or a string with beads on it are the governed by the continuous or discrete wave equation. We derive a small-vibrations model for multi-connected continuous strings that lie in a plane. We show that …

Machine Learning Methods For The Analysis Of Metagenomes, Vito Adrian Cantu Alessio Robles

CGU Theses & Dissertations

As of October 2020, there are 18.6 × 1015 DNA base pairs publicly available in the Sequence Read Archive and this number is growing at an exponential rate. As DNA sequencing prices continue to drop, many research groups around the world have incorporated high throughput sequencing in their research, giving us access to sequences from many distinct ecosystems. This has revolutionized the field of metagenomics, which aims to fully characterize all organisms and their interactions in a particular system. Nevertheless, the plethora of available data has made its analysis difficult as traditional techniques such as genome assembly or sequence alignment …

Chemical Synthesis And Biological Evaluation Of Benzimidazoles As Chemotherapeutics, Leonard Barasa

Theses and Dissertations

Nitrogen-containing heterocycles are among the most important structural motifs of chemical substances, which are well represented among natural products, and pharmaceuticals. The presence of nitrogen in heterocycles help to modulates physicochemical properties and the pKa profile of therapeutic leads.

Benzimidazole is a heterocyclic structure and a privileged scaffold that is routinely used during drug discovery efforts. The benzimidazole scaffold has structural similarity to purine which makes it a useful structural motif for the development of pharmaceutical or biological interesting molecules. Benzimidazole derivatives possess a wide variety of biological activities, including anti-bacterial, anti-cancer, and anti-inflammatory activities. Development of synthetic methods to …

Local Well-Posedness And Blow-Up For A Family Of U(1)-Invariant Peakon Equations, Stephen C. Anco, Huijun He, Zhijun Qiao

School of Mathematical and Statistical Sciences Faculty Publications and Presentations

The Cauchy problem for a unified family of integrable U(1)-invariant peakon equations from the NLS hierarchy is studied. As main results, local well-posedness is proved in Besov spaces, and blow-up is established through use of an L 1 conservation law.

Evolution Of Integration, Build, Test, And Release Engineering Into Devops And To Devsecops, Vishnu Pendyala

Faculty Research, Scholarly, and Creative Activity

Software engineering operations in large organizations are primarily comprised of integrating code from multiple branches, building, testing the build, and releasing it. Agile and related methodologies accelerated the software development activities. Realizing the importance of the development and operations teams working closely with each other, the set of practices that automated the engineering processes of software development evolved into DevOps, signifying the close collaboration of both development and operations teams. With the advent of cloud computing and the opening up of firewalls, the security aspects of software started moving into the applications leading to DevSecOps. This chapter traces the journey …

Gw190814: Gravitational Waves From The Coalescence Of A 23 Solar Mass Black Hole With A 2.6 Solar Mass Compact Object, R. Abbott, T. D. Abbott, S. Abraham, A. Aich, G. Bissenbayeva, Teviet Creighton, Mario C. Diaz, Soma Mukherjee

Physics and Astronomy Faculty Publications and Presentations

We report the observation of a compact binary coalescence involving a 22.2 - 24.3 M⊙ black hole and a compact object with a mass of 2.50 - 2.67 M⊙ (all measurements quoted at the 90% credible level). The gravitational-wave signal, GW190814, was observed during LIGO's and Virgo's third observing run on August 14, 2019 at 21:10:39 UTC and has a signal-to-noise ratio of 25 in the three-detector network. The source was localized to 18.5 deg2 at a distance of 241+41−45 Mpc; no electromagnetic counterpart has been confirmed to date. The source has the most unequal mass ratio yet measured with …

Near-Bottom Currents At Station M In The Northeast Pacific, Thomas Connolly, Paul Mcgill, Richard Henthorn, Drew Burrier, Cynthia Michaud

Faculty Research, Scholarly, and Creative Activity

No abstract provided.

Potential Greenhouse Gas Reductions From Natural Climate Solutions In Oregon, Usa, Rose A. Graves, Ryan D. Haugo, Andres Holz, Max Nielsen-Pincus, Aaron Jones, Bryce Kellogg, Cathy Macdonald, Kenneth Popper, Micheal Schindel

Environmental Science and Management Faculty Publications and Presentations

Increasing concentrations of greenhouse gases (GHGs) are causing global climate change and decreasing the stability of the climate system. Long-term solutions to climate change will require reduction in GHG emissions as well as the removal of large quantities of GHGs from the atmosphere. Natural climate solutions (NCS), i.e., changes in land management, ecosystem restoration, and avoided conversion of habitats, have substantial potential to meet global and national greenhouse gas (GHG) reduction targets and contribute to the global drawdown of GHGs. However, the relative role of NCS to contribute to GHG reduction at subnational scales is not well known. We examined …

Using Diatoms To Assess River Restoration: A Pilot Study In Whychus Creek, Oregon, Usa, Patrick M. Edwards, Yangdong Pan, Lauren Mork, Colin R. Thorne

Environmental Science and Management Faculty Publications and Presentations

A primary goal of river restoration is to reestablish lost ecological functions. Yet the impact of restoration on diatom assemblages and algal biomass in a stream is rarely addressed in the scientific literature reporting the outcomes of restoration projects aimed at improving riverine habitat. To investigate the potential for using benthic diatoms as indicators of the benefits to habitat associated with river restoration, we conducted a pilot diatom study in Whychus Creek, a headwater tributary of the Deschutes River in Oregon, USA. As part of a work study project for college students, we collected periphyton samples in a restored reach, …

Center For Coastal Resources Management Annual Report 2019, Center For Coastal Resources Management

Reports

No abstract provided.

Dna Detectives: Protecting Endangered Species, Samantha Askin

Reports

Grades: 9-12 Subjects: Biology | Environmental Science | Oceanography

For this lesson, students will be U.S. Fish and Wildlife Biologists. They will be tasked with figuring out which endangered or threatened species they have by identifying a genetic sequence unique to their species. The students will then have to research why their species in endangered or threatened and write a formal report of their findings to the U.S. Department of the Interior.

Old Macdonald Had An Aquaculture Farm, Shantelle Landry

Reports

Grades: 6 Subjects: Earth Science | Natural Resources

With this activity, students will learn the importance of aquaculture and how it can be used to manage a resource.

Isotopes In The Estuary: Conception And Application Of Stable And Radioactive Carbon, Derek Detweiler

Reports

Grades: 9-12 Subjects: Chemistry | Environmental Science | Oceanography

In this interactive estuary-focused activity, students will examine stable and radioactive isotope data which provide information about the source and age of environmental samples such as plant and soil matter. Students will calculate average isotope ratios from five reference land types (forest, wetland, agriculture, industry, aquatic) and an unknown site within an estuary. Students will graph their calculated ratios and determine the land type that most impacts their estuary based on reference-to-unknown comparisons.

Tiny Killers, Sarah Pease

Reports

Grades: 9-12 Subjects: Biology | Environmental Science | Oceanography

What different methods and new technologies are used to monitor harmful algae and the toxins that they produce?

Students will learn about how harmful algae threaten human health through the processes of bioaccumulation and biomagnification. In small groups, they will design a harmful algae monitoring program based on mock harmful algae data, and then they will test their monitoring program and discover some of the challenges and limitations of any monitoring plan that attempts to measure variable, natural events.

What's In The Muck? Benthic Sediment Characterization And Community Structure, Cristin Wright

Reports

Grades: 9-12 Subjects: Biology | Environmental Science | Oceanography

Sediment classification and grain size can affect the types of organisms that live in the sediment. Some organisms prefer sandier sediment, while others love the fine-grained mud.

In this activity, students will classify sediment samples by grain size and plot their findings on a ternary plot. The students will then further investigate which benthic organisms live in the different sediments and which may be more resilient to a change in sediment classification.

Trees Of The Seas, Michelle Woods

Reports

Grades: 6-8 Subjects: Biology | Life Science

What are harmful algal blooms and why do they occur?

In this lesson plan, students will run their own experiments to investigate how eutrophication can cause harmful algal blooms and investigate strategies for preventing them.

Feeding Time: How Nutrients Drive Phytoplankton Growth, Brianna Stanley

Reports

Grades: 9-12 Subjects: Biology | Environmental Science | Oceanography

This lesson plan helps students make the connection between the amount of nutrients present in an ecosystem and the resulting growth of phytoplankton in our coastal waters. This lesson takes this concept a step deeper, by exploring how the proportions of nitrogen and phosphorus in the environment create the ideal conditions for phytoplankton growth. Students will explore the concept of limiting factors and will work on both their graphing skills and their ability to compare ratios.

Wave Fever: The Climate Induced Range Expansion Of The Atlantic Marsh Fiddler Crab, Kayla Martinez-Soto

Reports

Grades: 9-12 Subjects: Biology | Environmental Science | Oceanography

In 2014, scientists found that the Atlantic marsh fiddler crab had extended its northern limit by ~90 miles to New Hampshire, which is in the Gulf of Maine. Range expanding species can alter salt marsh characteristics such as biodiversity and food webs. In this lesson, students will combine sea surface temperature data from a federal database and fiddler burrow densities from field photos to determine the relationship between ocean warming and range expansions.

Refining Program Capacity To Enhance And Protect Wetland Resources In Virginia: 2020 Final Report To Epa (#Bg983925-06-0), Virginia Institute Of Marine Science, Virginia Department Of Environmental Quality

Reports

Virginia continues to make significant progress in the development of a comprehensive wetland regulatory program and continued refinement of our wetland monitoring and assessment tools for use in management decision-making and integration within our water quality programs. This project focused on development of strategies to integrate management of wetlands across the landscape and among different jurisdictions sharing the same waterways. This project will increase the potential for protection and restoration of wetlands, but also include the added value of potentially improving impaired waters in Virginia. Project activities specifically addressed all of the priority elements in Virginia’s approved Wetlands Program Plan …