Physical Sciences and Mathematics Commons^™

Genetic Diversity Analysis Of Colletotrichum Gloeosporioides From Stylo And Anthracnose Resistant Breeding, Kexian Yi, Junsheng Huang

IGC Proceedings (1993-2023)

No abstract provided.

Morphological Diversity Of Puccinellia Tenuiflora And Its Relationship With The Environment In Song Neng Plain, Hongzhu Yu, Ankai Xu, Deli Wang

IGC Proceedings (1993-2023)

No abstract provided.

Direct Detection Of 5-Mev Protons By Flexible Organic Thin-Film Devices, Ilaria Fratelli, Andrea Ciavatti, Enrico Zanazzi, Laura Basiricò, Massimo Chiari, Laura Fabbri, John E. Anthony, Alberto Quaranta, Beatrice Fraboni

Chemistry Faculty Publications

The direct detection of 5-MeV protons by flexible organic detectors based on thin films is here demonstrated. The organic devices act as a solid-state detector, in which the energy released by the protons within the active layer of the sensor is converted into an electrical current. These sensors can quantitatively and reliably measure the dose of protons impinging on the sensor both in real time and in integration mode. This study shows how to detect and exploit the energy absorbed both by the organic semiconducting layer and by the plastic substrate, allowing to extrapolate information on the present and past …

Fitting An Analytic Magnetic Field To A Prestellar Core, Gianfranco Bino, Shantanu Basu

Physics and Astronomy Publications

We deploy and demonstrate the capabilities of the magnetic field model developed by Ewertowski & Basu by fitting observed polarimetry data of the prestellar core FeSt 1-457. The analytic hourglass magnetic field function derived directly from Maxwell's equations yields a central-to-surface magnetic field strength ratio in the equatorial plane, as well as magnetic field directions with relative magnitudes throughout the core. This fit emerges from a comparison of a single plane of the model with the polarization map that results from the integrated properties of the magnetic field and dust throughout the core. Importantly, our fit is independent of any …

Matrix Product Structure Of A Permuted Quasi Cyclic Code And Its Dual, Perian Perdhiku

Dissertations

In my Dissertation I will work mostly with Permuted Quasi Cyclic Codes. They are a generalization of Cyclic Codes, one of the most important families of Linear Codes in Coding Theory. Linear Codes are very useful in error detection and correction. Error Detection and Correction is a technique that first detects the corrupted data sent from some transmitter over unreliable communication channels and then corrects the errors and reconstructs the original data. Unlike linear codes, cyclic codes are used to correct errors where the pattern is not clear and the error occurs in a short segment of …

Development Of Mine Soils In A Chronosequence Of Forestry-Reclaimed Sites In Eastern Kentucky, Kenton L. Sena, Kevin M. Yeager, Christopher D. Barton, John M. Lhotka, William E. Bond, Kimberly J. Schindler

Lewis Honors College Faculty Publications

Surface mining for coal has contributed to widespread deforestation and soil loss in coal mining regions around the world, and particularly in Appalachia, USA. Mined land reforestation is of interest in this and other regions where forests are the dominant pre-mining land use. This study evaluated mine soil development on surface-mined sites reforested according to the Forestry Reclamation Approach, representing a chronosequence of time ranging from 0 to 19 years after reclamation. Soils were sampled in depth increments to 50 cm and analyzed for a suite of soil physical and chemical characteristics. Overall, soil fines (silt + clay) tended to …

Mpi4py Implementation Of Greedy Algorithm For The Shortest Path Problem, Arianna Martin, Jeremy Evert, Charles Sleeper

Student Research

No abstract provided.

Petrographic Characteristics Of Deep Marine Turbidite Sandstones Of The Upper Cretaceous Tanjero Formation, Northwestern Sulaimaniyah, Iraq: Implications For Provenance And Tectonic Setting, Hasan Çeli̇k, Hemin Muhammad Hama Sali̇h

Bulletin of the Mineral Research and Exploration

This study was carried out to determine the sedimentary provenance of Upper Cretaceous turbidites of Tanjero Formation. The sandstone portion of the unit has been examined based on field and laboratory studies. Seven sections were measured and described in detail on the perfectly cropped out part of the unit at the southern limb of the Sulaimaniyah Syncline. The thickness of the measured sections varies from 120 m to 192 m. The measured sections start from the top of the underlying Shiranish Formation to the syncline axis in the Tanjero Formation. For petrographic analysis sixty-nine representative rock samples were collected. Modal …

Generative Art, Caleb Harmon

Honors Theses

Generative Art is systems that produce complex structures and visuals through computation.

Effects Of Temperature & Ph On Bpa Leaching In Oral Hygiene Products Using Fluorescence Spectroscopy, Mady Rottinghaus

Honors Theses

No abstract provided.

Studies Of The Rectification Behavior Of The Pdt Ligand And The Active Site Of Msrp, Laura J. Ingersol

Chemistry and Chemical Biology ETDs

Molybdenum (Mo) is an essential element that plays an important role in global nitrogen, carbon, and sulfur cycles with a critical role in human metabolism and ecological balance. It becomes catalytically active when complexed with the pyranopterin dithiolene ligand (PDT), forming the nearly ubiquitous molybdenum cofactor (Moco). The complex biosynthetic pathway of Moco, its presence in all three domains of life, and its role as a constituent cofactor in the last universal common ancestor (LUCA) all point toward the importance of the PDT in the development of life on Earth. Molybdoenzymes catalyze the two-electron oxidation or reduction of substrates that …

Impact Of Hurricane Michael (2018) On Local Vertical Total Electron Content, Joanna E.S. Williams, Robert C. Tournay, H. Rose Tseng, Daniel J. Emmons Ii, Omar A. Nava

Faculty Publications

An analysis of vertical total electron content (TEC) estimates from the MIT Madrigal database is performed for the regions surrounding the eye of Hurricane Michael (2018). Absolute and detrended TEC values show a noticeable increase during the tropical cyclone (TC) relative to fluctuations at the same locations prior to the storm. Direct comparisons of TEC perturbation magnitudes to the number of lightning flashes in latitude-longitude boxes surrounding the eye of Hurricane Michael for each 5 min period of 10 October 2018 showed no visible trends. A similar comparison of the vertical TEC fluctuations with respect to the rainfall rates showed …

Prospects For Beyond The Standard Model Physics Searches At The Deep Underground Neutrino Experiment, B. Abi, R. Acciarri, M. A. Acero, G. Adamov, D. Adams, M. Adinolfi, Z. Ahmad, J. Ahmed, T. Alion, S. Alonso Monslave, C. Alt, J. Anderson, C. Andreopoulos, M. P. Andrews, F. Andrianala, S. Andringa, A. Ankowski, M. Antonova, S. Antusch, A. Aranda-Fernadez, Roberto Petti

Faculty Publications

The Deep Underground Neutrino Experiment (DUNE) will be a powerful tool for a variety of physics topics. The high-intensity proton beams provide a large neutrino flux, sampled by a near detector system consisting of a combination of capable precision detectors, and by the massive far detector system located deep underground. This configuration sets up DUNE as a machine for discovery, as it enables opportunities not only to perform precision neutrino measurements that may uncover deviations from the present three-flavor mixing paradigm, but also to discover new particles and unveil new interactions and symmetries beyond those predicted in the Standard Model …

Measurement Of The Fluctuations In The Number Of Muons In Extensive Air Showers With The Pierre Auger Observatory, A. Aab, P. Abreu, M. Aglietta, J. M. Albury, I. Allekotte, A. Almela, B. Fick, D. F. Nitz, A. Puyleart, Et. Al.

Michigan Tech Publications

We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower simulations. This observation provides new insights into the origin of the previously reported deficit of muons in air shower simulations and constrains models of hadronic interactions at ultrahigh energies. Our measurement is compatible with the muon deficit originating from small deviations in the predictions from hadronic interaction models of particle production that accumulate as the showers develop.

Chemical, Thermal, Time, And Enzymatic Stability Of Silk Materials With Silk I Structure, Meihui Zhao, Zhenzhen Qi, Xiaosheng Tao, Chad Newkirk, Xiao Hu, Shenzhou Lu

College of Science & Mathematics Departmental Research

The crystalline structure of silk fibroin Silk I is generally considered to be a metastable structure; however, there is no definite conclusion under what circumstances this crystalline structure is stable or the crystal form will change. In this study, silk fibroin solution was prepared from B. Mori silkworm cocoons, and a combined method of freeze-crystallization and freeze-drying at different temperatures was used to obtain stable Silk I crystalline material and uncrystallized silk material, respectively. Different concentrations of methanol and ethanol were used to soak the two materials with different time periods to investigate the effect of immersion treatments on the …

Fluorogenic Probes For Thioredoxin Reductase Activity, Tendai J. Mafireyi, Jorge O. Escobedo, Robert Strongin

Chemistry Faculty Publications and Presentations

The thioredoxin system is vital in maintaining the cellular redox state and is implicated in various cancers and other diseases. It comprises of thioredoxin reductase, thioredoxin and NADPH. Various methods have been developed for the detection and quantification of the thioredoxin reductase enzyme. Most of these methods suffer the shortfall of poor specificity, hence there is need to develop more robust and specific techniques. Recently, there has been an increased interest in fluorescent probes that can target thioredoxin reductase. This review highlights the progress in the synthesis and application of the different fluorescent probes that have been employed for this …

Defying The Darkness: Countering Cancer With Light, Travis Hankins

Honors Theses

Triple-Negative Breast Cancer (TNBC) accounts for upwards of 15% of reported breast cancer cases. This subtype of breast cancer poses a greater threat to those diagnosed as compared to other types of breast cancer due to the lack of treatment options available. Additionally, TNBC grows and spreads faster, tends to be more aggressive, and has a greater chance of recurrence than its counterparts. Altogether, TNBC cases generally have a worse prognosis over other types of breast cancer. Photodynamic therapy (PDT) is currently being researched as a way to treat TNBC. Photodynamic therapy agents are light-activated materials used for localized disease …

Dynamic Relationship Between Flowering Habits And Podding Of 7 Alfalfa Cultivars, Peizhi Yang, Quanzhen Wang, Tianming Hu

IGC Proceedings (1993-2023)

No abstract provided.

Potential Connections Between Graph Theory And Materials Modeling, Rachel Drake, Hector Medina

Liberty University Research Week

Undergraduate

Applied

Inhibiting Nitroso Related Methylation Of Guanine Using Dietary Supplements And Flavonoids, Madeline Mccoy, James Davis, Chloe Rippey, Stephen Hobson

Liberty University Research Week

Undergraduate

Basic

Preliminary Results On The Use Of Machine Learning For Advance Controls Of A Dielectric Elastomer Actuator, Nathanael Gentry, Carson Farmer, Hector Medina

Liberty University Research Week

Undergraduate

Applied

Raising Global Awareness And Internationality In The Undergraduate Organic Chemistry Laboratory, Marissa Scilley, Michael R. Korn

Liberty University Research Week

Undergraduate

Applied

The Science And Fiction Of The Multiverse, Alyssa Buren

Celebration of Research

Science fiction is often viewed as a way to escape reality and enter into a realm where any idea, no matter how farfetched it may seem, is possible. However, little do many people realize that some of these seemingly farfetched ideas are actual scientific theories. Among these lies the theory of the multiverse. Stemming from the big bang theory, the multiverse is a scientific theory created to explain the properties of the universe that are finely tuned for the existence of life. While the multiverse has many different theories within itself, the main idea is that the universe we observe …

Developing A Cloud Chamber To Measure Cosmic Ray Muons, Ryan Van Ostrand, Caroline Van Berkum

Celebration of Research

Prior to this project Northwestern had no means of seeing subatomic particles. We developed an innovative method using standard equipment to detect subatomic interactions. The intent of this project was primarily to create a working cloud chamber with a secondary goal of measuring the cosmic ray muon attenuation for each floor of Van Peursem Hall.

Popularity Vs Complexity In Esports Games, Kitrick Fynaardt

Celebration of Research

Esports is a booming new industry, full of a wide variety of players, games, sponsors, and tournaments. As the industry grows, audiences get bigger and bigger, with hundreds of thousands of fans from around the world watching their favorite Esport. With so much money and advertising deals on the line, Esport tournaments cannot afford to be boring. Esports need to be complex, interesting, and require vast amounts of skill. This paper aims to find a relationship between the complexity of an Esport and that Esport's popularity, to test whether or not complexity is a sufficient predictor for popularity. Due to …

Using Fcs To Explore Agglomeration States Of Small Heat Shock Proteins, Noah Gritters, David C. Arnett

Celebration of Research

Small heat shock proteins are present in nearly every form of life. However, despite their ubiquity, there are many questions about the structure of sHSPs. It is known that they can take a monomeric or an oligomeric form, and they have chaperone-like properties, meaning they help protect and fold other proteins. The aggregation and separation of these oligomers are reversible and controlled by environmental factors such as temperature and pH, but there are questions about the specifics of this process. I am growing up, purifying, and labeling sHSP so I can look into these questions using fluorescence correlation spectroscopy.

Fluorescent Labeling Of Calmodulin For Future Application, Emma Anunson, Emily Dobesh, Travis Grover, Benjamin Kingery, Dominick Pickard, Mitchell Rentschler, David Arnett

Celebration of Research

Calmodulin (CaM) is a small dumbbell-shaped, intermediary protein. CaM binds with several hundred different molecules to help control bodily functions. At Northwestern, we use fluorescently labeled CaM to understand these functions further. The goal of this project is to successfully label CaM protein using the fluorescent dye Alexa Fluor 594. After labeling CaM, we will use buffer exchange chromatography to purify the sample. Following that, we will use three processes to verify the successful labeling of CaM: UV/VIS spectroscopy, mass spectroscopy, and fluorescent microscope imaging. Once labeled and purified, our CaM samples can be used for years to come by …

Acid Catalyzed Small Ring Alcohols And Alkenes: An Artistic Approach To Visualizing Relationships Between Features Produced By Uv-Visible Spectra, Madeleine Ware

Campus Research Day

Madeleine Ware

Research Description

Campus Research Day

My physical organic chemistry research was supervised by Dr. Mitch Menzmer who studies the formation of carbocation intermediates in acid-catalyzed reactions of alkylated and non-alkylated small ring alcohols. The goal of my work was to compile data and develop methods to search for relationships between the initial structures of molecules analyzed and the wavelengths of maximum absorbance for features observed within a given spectrum. In addition, my advisor from the School of Visual Art and Design, Associate Professor Marc Boyson, contributed to this process by providing insights about the way information could be …

Socastee Interview, Participant #12, April 15, 2021, Jennifer Mokos, Jaime Mccauley

Flood Survivor Interviews

A community member of the Rosewood neighborhood in Socastee is interviewed by a CCU student.

Enhanced Nonlinear Interaction Of Polaritons Via Excitonic Rydberg States In Monolayer Wse2, Jie Gu, Valentin Walther, Lutz Waldecker, Daniel Rhodes, Archana Raja, James C. Hone, Tony F. Heinz, Stéphane Kéna-Cohen, Thomas Pohl, Vinod M. Menon

Publications and Research

Strong optical nonlinearities play a central role in realizing quantum photonic technologies. Exciton-polaritons, which result from the hybridization of material excitations and cavity photons, are an attractive candidate to realize such nonlinearities. While the interaction between ground state excitons generates a notable optical nonlinearity, the strength of such interactions is generally not sufficient to reach the regime of quantum nonlinear optics. Excited states, however, feature enhanced interactions and therefore hold promise for accessing the quantum domain of single-photon nonlinearities. Here we demonstrate the formation of exciton-polaritons using excited excitonic states in monolayer tungsten diselenide (WSe₂) embedded in a …