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Black On Red: A Search For African American Rights In Soviet Russia, Stephanie D. Sellers Mar 2024

Black On Red: A Search For African American Rights In Soviet Russia, Stephanie D. Sellers

Electronic Theses and Dissertations Archive

After the Russian Revolution of 1917, the Bolshevik Party sought to export Marxist-Leninism abroad to foster a global communist revolution. They called upon the world’s oppressed and exploited to join their cause. In the United States, a small group of African Americans answered this call and began to travel to the new socialist empire in the 1920s in search of a remedy to Jim Crow segregation that dictated every facet of black life in America. This handful of African Americans proved instrumental in establishing the Soviet position on American racism and were vital to the rise of the Communist Party …

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Effect Of Sex On The Development Of Non-Alcoholic Fatty Liver Disease During The Progression Of Metabolic Syndrome, Noah C. Wallace Mar 2024

Effect Of Sex On The Development Of Non-Alcoholic Fatty Liver Disease During The Progression Of Metabolic Syndrome, Noah C. Wallace

Electronic Theses and Dissertations Archive

Background: There is an association between sex and the prevalence of Metabolic Syndrome (MetS) and Non-Alcoholic Fatty Liver Disease (NAFLD). Objective: Determine the effects of sex and high fat/sucrose diet on the development of MetS and NAFLD. Methods: 30 male and 30 female C57BL/6 mice were place on one of three diets: High Fat (45% Fat), High Sugar (60% Sucrose), and Control. Results: Male mice on a High Fat diet showed the greatest weight gain amongst all the group as well as demonstrating earlier signs of glucose intolerance. Only those placed on a high sugar diet had indications of liver …

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An Exploration Of Bereaved Black And African American Youth’S Engagement With The Meaning Making Model Of Coping, Rachel Stobbe Mar 2024

An Exploration Of Bereaved Black And African American Youth’S Engagement With The Meaning Making Model Of Coping, Rachel Stobbe

Electronic Theses and Dissertations Archive

The death of a parent in childhood is a profoundly distressing event, which often overshadows discussions about post-loss growth. Importantly, Black and African American youth have been historically overlooked in the grief literature, despite experiencing high rates of parental loss influenced by discriminatory systems of oppression. The current study employed reflexive thematic analysis to assess engagement with the Meaning Making Model of Coping (Park, 2010; Park & Folkman, 1997) among 15 parentally bereaved Black and African American youth (Mage = 13.07, SD = 2.22; 60% female). Six themes emerged and findings suggest that creating space for bereaved youth to openly …

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Impulsivity And Motivational Deficits In Rats Perinatally Exposed To Delta-9-Tetrahydrocannabinol, Monica S. Carbajal Mar 2024

Impulsivity And Motivational Deficits In Rats Perinatally Exposed To Delta-9-Tetrahydrocannabinol, Monica S. Carbajal

Electronic Theses and Dissertations Archive

The perception that cannabis (i.e., marijuana) use produces little to no harm is widespread, with about 70% of both pregnant and nonpregnant women believing there is slight or no risk associated with using cannabis once or twice a week. However, perinatal exposure to cannabis has been linked to externalizing behaviors in offspring, including impulsivity, hyperactivity, and substance use – behaviors associated with externalizing disorders including attention-deficit hyperactivity disorder (ADHD). In preclinical research, most studies focus on exposure to the psychoactive constituent of cannabis, delta-9-tetrahydrocannabinol (∆9-THC). ∆9-THC is lipophilic so it can cross the placental barrier and is secreted in maternal …

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Jane Pickeringe's Lute Book: The Solo Lute Pieces In Her Hand, Lauren Jones Mar 2024

Jane Pickeringe's Lute Book: The Solo Lute Pieces In Her Hand, Lauren Jones

Electronic Theses and Dissertations Archive

A volume simply marked “Jane Pickeringe’s Lute Book” is held in the Egerton Collection at the British Library. It is an unassuming book filled with handwritten copies of lute pieces and is dated from 1616 to 1650. Some of the works are among the most famous lute opuses of the time, and some are simple, popular tunes. It includes duets, trios, and solo pieces, and a majority of the works are in one person’s handwriting, while there are over ten pieces in the back which are unclear sketches of music which are clearly in another person’s handwriting. Until now, this …

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Optimal Abort Guidance And Experimental Verification Based On Feature Learning, Vinay Kenny, Sixiong You, Chaoying Pei, Godfrey Hendrix, Roha Gul, Ran Dai, Jeremy Rea Mar 2024

Optimal Abort Guidance And Experimental Verification Based On Feature Learning, Vinay Kenny, Sixiong You, Chaoying Pei, Godfrey Hendrix, Roha Gul, Ran Dai, Jeremy Rea

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The abort mission refers to the mission where the landing vehicle needs to terminate the landing mission when an anomaly happens and be safely guided to the desired orbit. This paper focuses on solving the time-optimal abort guidance (TOAG) problem in real-time via the feature-based learning method. First, according to the optimal control theory, the features are identified to represent the optimal solutions of TOAG using a few parameters. After that, a sufficiently large data set of time-optimal abort trajectories is generated offline by solving the TOAG problems with different initial conditions. Then, the features are extracted for all generated …

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Jet-Driven Mixing Regimes Identified In The Unsteady Isothermal Filling Of Rectangular Municipal Water Storage Tanks, Pramod Narayan Bangalore, K. (Kelly) O. Homan Mar 2024

Jet-Driven Mixing Regimes Identified In The Unsteady Isothermal Filling Of Rectangular Municipal Water Storage Tanks, Pramod Narayan Bangalore, K. (Kelly) O. Homan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Poor mixing of old and new water in municipal water storage vessels is a well-documented basis for potentially harmful water quality degradation in drinking water distribution systems. This numerical study investigates the effects of inflow and operational variables on mixing in the jet-driven filling process, with a particular focus on the transition from inadequate to sufficient mixing levels. An isothermal unsteady reynolds-averaged-navier-stokes volume-of-fluid (RANS-VOF) simulation is used to model the variable-volume filling process, accounting for the moving free surface following a draw-down in the stored water volume. A low diffusivity tracer is used to mark the old-water volume, and a …

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The Thermophysical Properties Of Tco2, Hong Zhong, Jason Lonergan, John S. Mccloy, Scott P. Beckman Mar 2024

The Thermophysical Properties Of Tco2, Hong Zhong, Jason Lonergan, John S. Mccloy, Scott P. Beckman

Materials Science and Engineering Faculty Research & Creative Works

Technetium-99 Is A Highly Radioactive Isotope With A Long Half-Life That Is Common In Nuclear Waste. It Volatizes At A Low Temperature, Which Poses A Significant Challenge To The Clean-Up And Containment Processes. Due To Difficulties In Purifying Technetium Compounds, Their Thermophysical Properties Have Not Been Measured Or Calculated. Here, First Principle Methods Are Used Along With The Quasi Quasi-Harmonic Harmonic Approximation To Compute The Debye Temperature, Volumetric Thermal Expansion Coefficient, Bulk Modulus, And Heat Capacity Of Rutile TcO2 For Temperatures Ranging From 0 To 1500 K And Applied Pressures Ranging From 0 To 255 GPa. The Computed Atomic Structures …

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Demystifying The Link Between Social Media Addiction And Sharing Without Verification: The Role Of Absentmindedness And Wellbeing, Murad Moqbel, Khaled A. Alshare, Michael A. Erskine Mar 2024

Demystifying The Link Between Social Media Addiction And Sharing Without Verification: The Role Of Absentmindedness And Wellbeing, Murad Moqbel, Khaled A. Alshare, Michael A. Erskine

Information Systems Faculty Publications

We use salience and dual-system theories as the lens to investigate how (via which intervening mechanism) and when (under what condition(s)) social media addiction impacts unverified information sharing. Based on results from analyzing data from 234 social media users, we found that social media addiction augments unverified information sharing, and that absentmindedness partially mediates this relationship. Furthermore, we establish that wellbeing status buffers the harmful impact of social media addiction on unverified information sharing and absentmindedness.

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Multilayer Pva/Gelatin Nanofibrous Scaffolds Incorporated With Tanacetum Polycephalum Essential Oil And Amoxicillin For Skin Tissue Engineering Application, Ebrahim Soleiman-Dehkordi, Vahid Reisi-Vanani, Samanesadat Hosseini, Zahra Lorigooini, Vajihe Azimian Zvareh, Mahour Farzan, Elham Moghtadaie Khorasgani, Karen Lozano, Zohreh Abolhassanzadeh Mar 2024

Multilayer Pva/Gelatin Nanofibrous Scaffolds Incorporated With Tanacetum Polycephalum Essential Oil And Amoxicillin For Skin Tissue Engineering Application, Ebrahim Soleiman-Dehkordi, Vahid Reisi-Vanani, Samanesadat Hosseini, Zahra Lorigooini, Vajihe Azimian Zvareh, Mahour Farzan, Elham Moghtadaie Khorasgani, Karen Lozano, Zohreh Abolhassanzadeh

Mechanical Engineering Faculty Publications

Wound infection is still an important challenge in healing of different types of skin injuries. This highlights the need for new and improved antibacterial agents with novel and different mechanisms of action. In this study, by electrospinning process Tanacetum polycephalum essential oil (EO), as a natural antibacterial and anti-inflammatory agent, along with Amoxicillin (AMX) as an antibiotic are incorporated into PVA/gelatin-based nanofiber mats individually and in combination to fabricate a novel wound dressing. Briefly, we fabricated PVA/gelatin loaded by Amoxicillin as first layer for direct contact with wound surface to protects the wound from exogenous bacteria, and then built a …

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Fatty Acids And Their Proteins In Adipose Tissue Inflammation, Rahul Mallick, Sanjay Basak, Ranjit Kumar Das, Antara Banerjee, Sujay Paul, Surajit Pathak, Asim K. Duttaroy Mar 2024

Fatty Acids And Their Proteins In Adipose Tissue Inflammation, Rahul Mallick, Sanjay Basak, Ranjit Kumar Das, Antara Banerjee, Sujay Paul, Surajit Pathak, Asim K. Duttaroy

Health & Biomedical Sciences Faculty Publications

Chronic low-grade adipose tissue inflammation is associated with metabolic disorders. Inflammation results from the intertwined cross-talks of pro-inflammatory and anti-inflammatory pathways in the immune response of adipose tissue. In addition, adipose FABP4 levels and lipid droplet proteins are involved in systemic and tissue inflammation. Dysregulated adipocytes help infiltrate immune cells derived from bone marrow responsible for producing cytokines and chemokines. When adipose tissue expands in excess, adipocyte exhibits increased secretion of adipokines and is implicated in metabolic disturbances due to the release of free fatty acids. This review presents an emerging concept in adipose tissue fat metabolism, fatty acid handling …

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Tenth Anniversary Celebratory Essays: The Rocky Mountain Collective On Race, Place & Law: Editor's Note, Rachel Garlick Mar 2024

Tenth Anniversary Celebratory Essays: The Rocky Mountain Collective On Race, Place & Law: Editor's Note, Rachel Garlick

Denver Law Review

No abstract provided.

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Open-Inquiry Opens Doors To Intriguing Optics Experiments At Home: A Case Study, Paul R. Destefano, Ralf Widenhorn Mar 2024

Open-Inquiry Opens Doors To Intriguing Optics Experiments At Home: A Case Study, Paul R. Destefano, Ralf Widenhorn

Physics Faculty Publications and Presentations

[This paper is part of the Focused Collection on Instructional labs: Improving traditions and new directions.] This manuscript presents a case study of an introductory physics student who, during the remote learning conditions imposed during the COVID-19 pandemic, found inspiration within a new, openinquiry, project-based, laboratory curriculum designed at Portland State University. The phenomenon investigated by the study subject was intriguing to both the student and the lab instructors for its unfamiliar and instructive optical effect: a ring-shaped pattern or halo created by a laser diffusely reflected in a shallow body of water. Drawing on classwork and interview responses, this …

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Numerical Back Analysis Of An Underground Bulk Mining Operation Using Distributed Optical Fiber Sensors For Model Calibration, Samuel Nowak, Taghi Sherizadeh, Mina Esmaeelpour, Paul Brooks, Dogukan Guner, Kutay Karadeniz Mar 2024

Numerical Back Analysis Of An Underground Bulk Mining Operation Using Distributed Optical Fiber Sensors For Model Calibration, Samuel Nowak, Taghi Sherizadeh, Mina Esmaeelpour, Paul Brooks, Dogukan Guner, Kutay Karadeniz

Mining Engineering Faculty Research & Creative Works

Numerical Modeling Of Complex Underground Engineering Projects Such As Caverns, Tunnels, And Bulk Mining Zones Is An Essential Part Of The Design Phase. Large-Scale Models Require Significant Reductions In Complexity From The Real-World Scenario, Which Often Leads To Low Confidence In The Model Output. In This Work, A Mine-Scale Numerical Model Is Developed To Simulate A Room And Pillar Extraction Mining Operation. The Model Inputs Are Calibrated Through The Comparison Of The Model Response To Pillar Extraction In An Analogous Mine Geometry With Measured Strain Values Collected Using A Novel Distributed Optical Fiber Strain Sensing Technique After Pillar Extraction. Calibration …

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The Ackerman Institute: A Journey Of Culture And Diversity Over Six Decades. A Conversation With Evan Imber-Black, Deisy Amorin-Woods, Evan Imber-Black Mar 2024

The Ackerman Institute: A Journey Of Culture And Diversity Over Six Decades. A Conversation With Evan Imber-Black, Deisy Amorin-Woods, Evan Imber-Black

Research outputs 2022 to 2026

The Ackerman Institute for the Family, established in 1960 by Dr Nathan Ackerman, stands as one of the oldest and most respected family therapy institutes in the United States. Ackerman pioneered the integration of systemic insights into group settings, emphasised the crucial role of family in therapy, and advocated for the advancement and acceptance of family therapy. ‘The Ackerman’ played a pivotal role in launching Family Process, the first journal dedicated to academic activities in family therapy. Diversity and inclusion have been central tenets of Ackerman philosophy, evident in its programs, training courses, and staff composition. This commitment has produced …

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Voice Synthesis Improvement By Machine Learning Of Natural Prosody, Joseph Kane, Michael N. Johnstone, Patryk Szewczyk Mar 2024

Voice Synthesis Improvement By Machine Learning Of Natural Prosody, Joseph Kane, Michael N. Johnstone, Patryk Szewczyk

Research outputs 2022 to 2026

Since the advent of modern computing, researchers have striven to make the human–computer interface (HCI) as seamless as possible. Progress has been made on various fronts, e.g., the desktop metaphor (interface design) and natural language processing (input). One area receiving attention recently is voice activation and its corollary, computer-generated speech. Despite decades of research and development, most computer-generated voices remain easily identifiable as non-human. Prosody in speech has two primary components—intonation and rhythm—both often lacking in computer-generated voices. This research aims to enhance computer-generated text-to-speech algorithms by incorporating melodic and prosodic elements of human speech. This study explores a novel …

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Universality Class Of A Spinor Bose–Einstein Condensate Far From Equilibrium, Seung Jung Huh, Koushik Mukherjee, Kiryang Kwon, Jihoon Seo, Junhyeok Hur, Simeon I. Mistakidis, H. R. Sadeghpour, Jae Yoon Choi Mar 2024

Universality Class Of A Spinor Bose–Einstein Condensate Far From Equilibrium, Seung Jung Huh, Koushik Mukherjee, Kiryang Kwon, Jihoon Seo, Junhyeok Hur, Simeon I. Mistakidis, H. R. Sadeghpour, Jae Yoon Choi

Physics Faculty Research & Creative Works

Scale Invariance And Self-Similarity In Physics Provide A Unified Framework For Classifying Phases Of Matter And Dynamical Properties Near Equilibrium In Both Classical And Quantum Systems. This Paradigm Has Been Further Extended To Isolated Many-Body Quantum Systems Driven Far From Equilibrium, For Which The Physical Observables Exhibit Dynamical Scaling With Universal Scaling Exponents. Universal Dynamics Appear In A Wide Range Of Scenarios, Including Cosmology, Quark–gluon Matter, Ultracold Atoms And Quantum Spin Magnets. However, How The Universal Dynamics Depend On The Symmetry Of The Underlying Hamiltonian In Non-Equilibrium Systems Remains An Outstanding Challenge. Here We Report On The Classification Of Universal …

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Ionization Cross Sections Of Hydrogen Molecule By Electron And Positron Impact, Károly Tőkési, Robert D. Dubois Mar 2024

Ionization Cross Sections Of Hydrogen Molecule By Electron And Positron Impact, Károly Tőkési, Robert D. Dubois

Physics Faculty Research & Creative Works

We Present Ionization Cross Sections of Hydrogen Molecules by Electron and Positron Impact for Impact Energies between 20 and 1000 EV. a Three-Body Classical Trajectory Monte Carlo Approximation is Applied to Mimic the Collision System. in This Approach, the H2 Molecule is Modeled by a Hydrogen-Type Atom with One Active Electron Bound to a Central Core of Effective Charge with an Effective Binding Energy. Although This Model is Crude for Describing a Hydrogen Molecule, We Found that the Total Cross Sections for Positron Impact Agree Reasonably Well with the Experimental Data. for the Electron Impact, Our Calculated Cross Sections Are …

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Bootstrap Inference For Quantile Treatment Effects In Randomized Experiments With Matched Pairs, Liang Jiang, Xiaobin Liu, Peter C B Phillips, Yichong Zhang Mar 2024

Bootstrap Inference For Quantile Treatment Effects In Randomized Experiments With Matched Pairs, Liang Jiang, Xiaobin Liu, Peter C B Phillips, Yichong Zhang

Research Collection School Of Economics

This paper examines methods of inference concerning quantile treatment effects (QTEs) in randomized experiments with matched-pairs designs (MPDs). Standard multiplier bootstrap inference fails to capture the negative dependence of observations within each pair and is therefore conservative. Analytical inference involves estimating multiple functional quantities that require several tuning parameters. Instead, this paper proposes two bootstrap methods that can consistently approximate the limit distribution of the original QTE estimator and lessen the burden of tuning parameter choice. Most especially, the inverse propensity score weighted multiplier bootstrap can be implemented without knowledge of pair identities.

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Testing The Dimensionality Of Policy Shocks, Jia Li, Viktor Todorov, Qiushi Zhang Mar 2024

Testing The Dimensionality Of Policy Shocks, Jia Li, Viktor Todorov, Qiushi Zhang

Research Collection School Of Economics

This paper provides a nonparametric test for deciding the dimensionality of a policy shock as manifest in the abnormal change in asset returns' stochastic covariance matrix, following the release of a macroeconomic announcement. We use high-frequency data in local windows before and after the event to estimate the covariance jump matrix, and then test its rank. We find a one-factor structure in the covariance jump matrix of the yield curve resulting from the Federal Reserve's monetary policy shocks prior to the 2007-2009 financial crisis. The dimensionality of policy shocks increased afterwards due to the use of unconventional monetary policy tools.

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Optimal Inference For Spot Regressions, Tim Bollerslev, Jia Li, Yuexuan Ren Mar 2024

Optimal Inference For Spot Regressions, Tim Bollerslev, Jia Li, Yuexuan Ren

Research Collection School Of Economics

Betas from return regressions are commonly used to measure systematic financial market risks. "Good" beta measurements are essential for a range of empirical inquiries in finance and macroeconomics. We introduce a novel econometric framework for the nonparametric estimation of time-varying betas with high-frequency data. The "local Gaussian" property of the generic continuous-time benchmark model enables optimal "finite-sample" inference in a well-defined sense. It also affords more reliable inference in empirically realistic settings compared to conventional large-sample approaches. Two applications pertaining to the tracking performance of leveraged ETFs and an intraday event study illustrate the practical usefulness of the new procedures.

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Obfuscation And Rational Inattention, Aljoscha Janssen, Johannes Kasinger Mar 2024

Obfuscation And Rational Inattention, Aljoscha Janssen, Johannes Kasinger

Research Collection School Of Economics

We study the behavior of duopolistic firms that can obfuscate their prices before competing on price. Obfuscation affects the rational inattentive consumers' optimal information strategy, which determines the probabilistic demand. Our model advances related models by allowing consumers to update their unrestricted prior beliefs with an informative signal of any form. We show that the game may result in an obfuscation equilibrium with high prices or a transparency equilibrium with low prices and no obfuscation, providing an argument for market regulation. Obfuscation equilibria cease to exist for low information costs and if one firm seems a priori considerably more attractive.

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Migration And Resource Misallocation In China, Xiaolu Li, Lin Ma, Yang Tang Mar 2024

Migration And Resource Misallocation In China, Xiaolu Li, Lin Ma, Yang Tang

Research Collection School Of Economics

We structurally estimate the firm-level frictions across prefectures in China and quantify their aggregate and distributional implications. Based on a general equilibrium model with input and output distortions and migration, we show that the firm-level frictions are less dispersed and less correlated with firm productivity in richer prefectures. Counterfactual exercises show that reducing the within-prefecture misallocation increases aggregate welfare, discourages migration toward large prefectures, and reduces spatial inequality. Moreover, internal migration alleviates micro-frictions’ impacts on aggregate welfare and worsens their effects on spatial inequality.

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The Distributional Impacts Of Transportation Networks In China, Lin Ma, Yang Tang Mar 2024

The Distributional Impacts Of Transportation Networks In China, Lin Ma, Yang Tang

Research Collection School Of Economics

We document that the quality of roads and railroads vary substantially over time and space in China, and neglecting these variations biases the distributional impacts of transportation networks. To account for quality differences, we construct a new panel dataset and approximate quality using the design speed of roads and railroads that varies by vintage, class, and terrain at the pixel level. We then build a dynamic spatial general equilibrium model for multiple modes, transportation routes, and forward-looking migration decisions. Our findings demonstrate that disregarding quality differences leads to a median bias of approximately 31% in estimating real wage growth rates …

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Panel Data Models With Time-Varying Latent Group Structures, Yiren Wang, Peter C. B. Phillips, Liangjun Su Mar 2024

Panel Data Models With Time-Varying Latent Group Structures, Yiren Wang, Peter C. B. Phillips, Liangjun Su

Research Collection School Of Economics

This paper considers a linear panel model with interactive fixed effects and unobserved individual and time heterogeneities that are captured by some latent group structures and an unknown structural break, respectively. To enhance realism, the model may have different numbers of groups and/or different group memberships before and after the break. With preliminary nuclear norm regularized estimation followed by row- and column-wise linear regressions, we estimate the break point based on the idea of binary segmentation and the latent group structures together with the number of groups before and after the break by sequential testing K-means algorithm simultaneously. It is …

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Who Watched Pre/Post-Lecture Tutorial Videos? Does Flipped Learning Help Beginners In Economics?, Bei Hong Mar 2024

Who Watched Pre/Post-Lecture Tutorial Videos? Does Flipped Learning Help Beginners In Economics?, Bei Hong

Research Collection School Of Economics

The modern-day classroom is characterized by academic diversity, with students from varied backgrounds and with different levels of prior knowledge. To cater to the diverse abilities of students, this paper explored the use of flipped learning as a teaching approach in an introductory economics course. We investigated the effectiveness of 40 pre-lecture videos covering basic concepts and 27 post-lecture tutorial videos focusing on practice in improving students' exam outcomes, especially for beginners in economics who may require more support from instructors than other students. We collected data about video engagement and students' grades in progress assessments. Surveys were conducted to …

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High Frequency Principal Component Analysis Based On Correlation Matrix That Is Robust To Jumps, Microstructure Noise And Asynchronous Observation Times, Dachuan Chen Mar 2024

High Frequency Principal Component Analysis Based On Correlation Matrix That Is Robust To Jumps, Microstructure Noise And Asynchronous Observation Times, Dachuan Chen

Research Collection School Of Economics

This paper developed the high frequency estimation for the principal component analysis (PCA) based on correlation matrix. This estimation methodology is robust to jumps, microstructure noise and asynchronous observation times simultaneously, which is enabled by the newly proposed Truncated and Smoothed Two-Scales Realized Volatility (Truncated S-TSRV) estimator. The general framework of our methodology is constructed based on the estimation of realized spectral functions with respect to the spot correlation matrix. A new asymptotic representation for the element-wise estimation error of the spot correlation matrix estimate has been derived, resulting in a new bias correction term which is much more complex …

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Designing An Optical Router Based On A Multimode-Interference Silicon-On-Insulator Coupler With Tunable Power Transmittance, Dana S. Akil, Muhammad A. Othman, Sherif M. Sherif, Mohamed A. Swillam Mar 2024

Designing An Optical Router Based On A Multimode-Interference Silicon-On-Insulator Coupler With Tunable Power Transmittance, Dana S. Akil, Muhammad A. Othman, Sherif M. Sherif, Mohamed A. Swillam

Faculty Journal Articles

The demand on fast and high-bandwidth data transmission is in continuous increase. These demands are highly dependent on optical signal manipulation, including switching, modulation, and routing. We demonstrate a two-port silicon optical router based on the multimode interferometer (MMI) configuration. The same MMI structure was used for both inward and backward waveguiding to reduce the total length of the device. A phase shifter consisting of two ring-like waveguides made of silicon p-n junctions was used to introduce the phase shift needed for optical routing upon voltage application. Two designs for the MMI optical router were studied: Firstly, a conventional MMI …

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Highly Sensitive On-Chip Grating-Based Optical Sensor On Glass Substrate: Cost-Effective Design, Hesham A. Attia, Mulan E. Ahmed, Adel Shaaban Awad Elsharkawi, Mohamed A. Swillam Mar 2024

Highly Sensitive On-Chip Grating-Based Optical Sensor On Glass Substrate: Cost-Effective Design, Hesham A. Attia, Mulan E. Ahmed, Adel Shaaban Awad Elsharkawi, Mohamed A. Swillam

Faculty Journal Articles

This paper presents a novel on-chip optical sensing system using ion exchange technology and phase-shifted Bragg grating design. The sensor geometry has been optimized using a finite difference time domain (FDTD) solver to achieve maximum sensitivity and figure of merit (FOM). The proposed design offers high sensitivity to changes in refractive index and low fabrication costs. The ion exchange process used to create the sensor allows for precise refractive index control, optimizing the sensor’s sensitivity and FOM. A graded-index waveguide and a phase-shifted Bragg grating structure also contribute to the sensor’s high sensitivity. The proposed sensor design was tested for …

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The Use Of Economic Indicators As Early Signals Of Stock Market Progress: Perspectives From Market Potential Index, Tarek Eldomiaty, Islam Azzam, Mostafa Fouad, Yasmeen Said Mar 2024

The Use Of Economic Indicators As Early Signals Of Stock Market Progress: Perspectives From Market Potential Index, Tarek Eldomiaty, Islam Azzam, Mostafa Fouad, Yasmeen Said

Faculty Journal Articles

The progress of financial markets depends on the way world investors foresee the market potential of the country of choice. Countries that are associated with favorable economic incentives are able to motivate investments in their respective stock markets. The objective of this paper is to examine the role of the many economic components which constitute the Market Potential Index in enhancing stock market progress. The methodology goes through testing and estimation. The tests include linearity versus nonlinearity (RESET), normality, and cointegration. The estimation includes cointegration regression and discriminant analysis to distinguish between high and low stock market progress. This study …

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