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Analysis Of Environmental Effects On A Solar Hydrogen Production System., F. Areed Sep 2021

Analysis Of Environmental Effects On A Solar Hydrogen Production System., F. Areed

Mansoura Engineering Journal

Development of new energy resources has become an important object. The proposed of separating hydrogen form water for utilization as a substitute for oil and other fossil fules has become a field of interest for energy planners and decisions makers. The present work is concerned with studying and analyzsng a photovoltaic (Poly-Si manufactured by Solarex co) solar hydrogen system installed over the roof the institute of Astronomty and Genphysics at Helwan. Egypt. Fig (1): The system is constructed to measure the temperature of solar cell at center of the panel and near its edges. Using two thermocouples as sensors. The …

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Fabrication Of Plywood, Laminated Sheets And Particleboards From Palm Leaves Midribs., Moustafa Mohamed, Abd El-Malek Abou Khashaba Sep 2021

Fabrication Of Plywood, Laminated Sheets And Particleboards From Palm Leaves Midribs., Moustafa Mohamed, Abd El-Malek Abou Khashaba

Mansoura Engineering Journal

The present paper is concerned with the utilization of local resources, available in Arab Countries, to produce and fabricate products replacing the imported wood products. Palm leaves midribs were successfully used to manufacture products equivalent to plywood, laminated wood and particleboards. A wide variety of products were fabricated from palm leaves midribs. These were: plywood boards made up of three layers each 1 mm thick, laminated boards of various thicknesses, particleboards made of particles and/or flax from the midribs with varying percentage of particles and flax, which led to the production of fine, medium and coarse particleboards. These products were …

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Comparative Analyses Based On Simulations To Improve Energy Consumption In Office Buildings In Egypt., Amr Youssef Sep 2021

Comparative Analyses Based On Simulations To Improve Energy Consumption In Office Buildings In Egypt., Amr Youssef

Mansoura Engineering Journal

A growing attention has been paid to building envelope features for achieving lower energy consumption especially in large office buildings and hot climate zones, since these features and their variables are affecting energy consumption widely and with different sensitivity. Therefore, this paper conducts simulation-based comparative analyses between main envelope features with their internal variables; the selected features for this study are building geometry ratios, orientations and common envelope finishing materials (FMs). Two applications have been conducted (comparing cases with either a same or different building volumes), and more than 500 cases/simulations have been conducted and studied in total. Accordingly, sensitive …

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Influence Of Misalignment Method On Performance Of Dowel Bars In Joints Of Rigid Pavement., Mostafa Rabah, Mohamed Eisa, Ahmed Mohamed Elghanam Sep 2021

Influence Of Misalignment Method On Performance Of Dowel Bars In Joints Of Rigid Pavement., Mostafa Rabah, Mohamed Eisa, Ahmed Mohamed Elghanam

Mansoura Engineering Journal

Load transfer across transverse joints has always been into consideration of rigid pavement design. Steel dowels of circular cross-section were the standard load transfer device. Many problems have been related to steel dowels such as corrosion. At the same time, joints are also damaged by repeated loading over time. This research presents an experimental investigation into the comparison between the Glass Fiber Reinforced Polymer (GFRP) and steel dowel bars placed in the transverse joints of the Jointed Plain Concrete Pavement (JPCP). The main objective of this study to assess the suitability of using GFRP dowel bars as an alternative corrosion-free …

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A Fuzzy Model For An Automotive Engines-Development On A Production Vehicle., Alaa Sheta, Janos Gertler Sep 2021

A Fuzzy Model For An Automotive Engines-Development On A Production Vehicle., Alaa Sheta, Janos Gertler

Mansoura Engineering Journal

In this paper, we developed a fuzzy model for an automotive engine. The fuzzy model was presented by a set of rules based on the Takagi-Sugeno type. The Gustafson-Kessel (GK) algorithm was applied to determine the antecedent membership functions and east square estimation was used to determine the consequence parameters. The performance of the fuzzy model was tested using a set of measurements recorded from a single production vehicle with a 3.1 I V-6 engine and a four speed automatic transmission. This data was collected earlier during a project implemented at George Mason University, USA. The developed fuzzy model was …

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Studying The Magnetohydrodynamics For Williamson Fluid With Varying Temperature And Concentration In An Inclined Channel With Variable Viscosity, Wissam Sadiq Khudair, Hasan Hadi Dwail Sep 2021

Studying The Magnetohydrodynamics For Williamson Fluid With Varying Temperature And Concentration In An Inclined Channel With Variable Viscosity, Wissam Sadiq Khudair, Hasan Hadi Dwail

Baghdad Science Journal

In this paper, the Magnetohydrodynamic (MHD) for Williamson fluid with varying temperature and concentration in an inclined channel with variable viscosity has been examined. The perturbation technique in terms of the Weissenberg number (����≪1)to obtain explicit forms for the velocity field has been used. All the solutions of physical parameters of the Darcy parameter(����), Reynolds number(����), Peclet number (����)and Magnetic parameter (��)are discussed under the different values as shown in plots..

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Effect Of Salt And Osmotic Stresses On The Activity Of Some Antioxidant Enzymes And Biochemical Traits In Catharanthus Roseus, Solaf Alaakel, Ayman Shehada Al-Ouda, Youssef Al-Ammouri Sep 2021

Effect Of Salt And Osmotic Stresses On The Activity Of Some Antioxidant Enzymes And Biochemical Traits In Catharanthus Roseus, Solaf Alaakel, Ayman Shehada Al-Ouda, Youssef Al-Ammouri

Baghdad Science Journal

Abstract The experiment has been carried out in the Syrian National Commission of Biotechnology, during the growing season 2018/2019, to study the effect of abiotic stresses (salinity and osmotic stresses) on the activity of some antioxidant enzymes and biochemical traits in Catharanthus roseus. The experiment has been laid according to (CRD) with three replications. The seeds have been sterilized by NaOCl solution (0.5% v/v), then planted on MS medium. Plantlets have been moved to MS medium enriched with NAA (1 mg.L-1) and BA (2 mg.L-1). The callus has been initiated from leaves using MS medium containing NAA (1 mg L-1) …

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Measuring Positive And Negative Association Of Apriori Algorithm With Cosine Correlation Analysis, Dewi W. Wardani Sep 2021

Measuring Positive And Negative Association Of Apriori Algorithm With Cosine Correlation Analysis, Dewi W. Wardani

Baghdad Science Journal

This work aims to see the positive association rules and negative association rules in the Apriori algorithm by using cosine correlation analysis. The default and the modified Association Rule Mining algorithm are implemented against the mushroom database to find out the difference of the results. The experimental results showed that the modified Association Rule Mining algorithm could generate negative association rules. The addition of cosine correlation analysis returns a smaller amount of association rules than the amounts of the default Association Rule Mining algorithm. From the top ten association rules, it can be seen that there are different rules between …

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Preparing And Studying Structural And Optical Properties Of Pb1-Xcdxs Nanoparticles Of Solar Cells Applications, Haneen S. Hakeem, Nada K. Abbas Sep 2021

Preparing And Studying Structural And Optical Properties Of Pb1-Xcdxs Nanoparticles Of Solar Cells Applications, Haneen S. Hakeem, Nada K. Abbas

Baghdad Science Journal

Nanoparticles of Pb1-xCdxS within the composition of 0≤x≤1 were prepared from the reaction of aqueous solution of cadmium acetate, lead acetate, thiourea, and NaOH by chemical co-precipitation. The prepared samples were characterized by UV-Vis spectroscopy(in the range 300-1100nm) to study the optical properties, AFM and SEM to check the surface morphology(Roughness average and shape) and the particle size. XRD technique was used to determine the crystalline structure, XRD technique was used to determine the purity of the phase and the crystalline structure, The crystalline size average of the nanoparticles have been found to be 20.7, 15.48, 11.9, 11.8, and 13.65 …

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Preparing Nanosilica Particles From Rice Husk Using Precipitation Method, Rusel Zahraw Farhan, Shahlaa Esmail Ebrahim Sep 2021

Preparing Nanosilica Particles From Rice Husk Using Precipitation Method, Rusel Zahraw Farhan, Shahlaa Esmail Ebrahim

Baghdad Science Journal

Nanosilica was extracted from rice husk, which was locally collected from the Iraqi mill at Al-Mishikhab district in Najaf Governorate, Iraq. The precipitation method was used to prepared Nanosilica powder from rice husk ash, after treating it thermally at 700°C, followed by dissolving the silica in the alkaline solution and getting a sodium silicate solution. Two samples of the final solution were collected to study the effect of filtration on the purity of the sample by X-ray fluorescence spectrometry (XRF). The result shows that the filtered samples have purity above while the non-filtered sample purity was around The structure analysis …

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Effects Of Nitrogen And Sulfur Sprays On The Growth And Production Of Broccoli Brassica Oleracea Var. Italica L., Mushtak F. Karomi Kisko, Nabil Jwad Kadhum, Zainab Anwar Ali, Noora Saheb Abid Sep 2021

Effects Of Nitrogen And Sulfur Sprays On The Growth And Production Of Broccoli Brassica Oleracea Var. Italica L., Mushtak F. Karomi Kisko, Nabil Jwad Kadhum, Zainab Anwar Ali, Noora Saheb Abid

Baghdad Science Journal

In order to achieve optimal plant growth and production, essential nutrients must be readily available in adequate quantities and in a balanced proportion to give a good yield, especially broccoli which has health benefits that may not be found in many other plants. For this purpose, this experiment was carried out during the seasons 2019/2020 in the botanical garden of the Department of Biology, College of Science for Women, University of Baghdad, to study the effects of nitrogen and sulphur and their interaction on eight parameters reflecting the overall traits of vegetative growth, yield, and chlorophyll content of broccoli Brassica …

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Fluctuations Of Macroeconomic Variables And Manufacturing Output: Issues, Challenges And Prospects Of The Growth Of Manufacturing Output In Nigeria, Chris Ac-Ogbonna Sep 2021

Fluctuations Of Macroeconomic Variables And Manufacturing Output: Issues, Challenges And Prospects Of The Growth Of Manufacturing Output In Nigeria, Chris Ac-Ogbonna

Bullion

The study examined the impact of fluctuations of macroeconomic variables such as exchange rate, lending rates and inflation rates on the manufacturing output in Nigeria. The paper used descriptive analysis to investigate the relationship between manufacturing output and macroeconomic stability in Nigeria. The findings revealed that macroeconomic instability impacted negatively on the manufacturing output. The paper therefore recommended that policies that will streamline the multiple and volatile exchange rates, interest rate and inflation control should be designed and implemented to ensure their predictability to aid planning and attract both domestic and foreign investors to the, manufacturing sector. This is expected …

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Realigning The Clean Water Act: Comprehensive Treatment Of Nonpoint Source Pollution, Robin M. Rotman, Ashley A. Hollis, Kathleen M. Trauth Sep 2021

Realigning The Clean Water Act: Comprehensive Treatment Of Nonpoint Source Pollution, Robin M. Rotman, Ashley A. Hollis, Kathleen M. Trauth

Faculty Publications

Nonpoint source pollution is the biggest threat to water quality in the United States today. This Article argues for stronger federal controls over nonpoint source pollution. It begins by examining the history of water quality regulation in the United States, including the passage and amendment of the Clean Water Act and the evolving definition of “navigable waters” over time. The Article then discusses recent rulemaking and litigation developments, including the Clean Water Rule, the Navigable Waters Protection Rule, and the County of Maui, Hawaii v. Hawaii Wildlife Fund case. It offers three recommendations. First, the Article calls for a congressional …

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Acting With Inscriptions: Expanding Perspectives Of Writing, Learning, And Becoming, Kevin R. Roozen Sep 2021

Acting With Inscriptions: Expanding Perspectives Of Writing, Learning, And Becoming, Kevin R. Roozen

The Journal of the Assembly for Expanded Perspectives on Learning

This article argues for increased attention to people’s engagements with inscriptions and inscriptional practices and the long-term implications they have for the ongoing production of persons, practices, and social worlds across heterogeneous times, places, and activities. Based on a multi-year case study, this analysis examines one microbiology major’s production and use of inscriptions at the intersections of his participation in both disciplinary science and religious worship and traces the long-term consequences those uses have for his becoming as a scientist of faith. If, as Paul Prior asserts, “ literate activity is not located in acts of reading and writing but …

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What’S Left Before Participatory Modeling Can Fully Support Real-World Environmental Planning Processes: A Case Study Review, Beatrice Hedelin, S. Gray, S. Woehlke, Todd K. Bendor, Alison Singer, R. Jordan, Moira Zellner, Philippe J. Giabbanelli, Pierre D. Glynn, Antoine J. Jetter, Multiple Additional Authors Sep 2021

What’S Left Before Participatory Modeling Can Fully Support Real-World Environmental Planning Processes: A Case Study Review, Beatrice Hedelin, S. Gray, S. Woehlke, Todd K. Bendor, Alison Singer, R. Jordan, Moira Zellner, Philippe J. Giabbanelli, Pierre D. Glynn, Antoine J. Jetter, Multiple Additional Authors

Engineering and Technology Management Faculty Publications and Presentations

In environmental participatory modeling (PM), both computer and non-computer-based modeling techniques are used to aid participatory problem description, solution, and decision-making actions in environmental contexts. Although many PM case studies have been published, few efforts have sought to systematically describe and understand dominant PM processes or establish best practices for PM. As a first step, we have reviewed a random sample of environmental PM case study articles (n = 60) using a novel PM process evaluation instrument. We found that significant work likely remains for PM to fully support participatory and integrated planning processes. While PM reports systematically address knowledge …

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Eating For Hunger Or Pleasure: A Serotonin Model, Zili Yan, Yanlin He, Xing Cai, Gang Shu, Yong Xu Sep 2021

Eating For Hunger Or Pleasure: A Serotonin Model, Zili Yan, Yanlin He, Xing Cai, Gang Shu, Yong Xu

Division of Basic Science Faculty Publications

No abstract provided.

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Securing Secrets: The Need For A Treaty Addressing State-Sponsored Economic Espionage, Jaylin Johnson Sep 2021

Securing Secrets: The Need For A Treaty Addressing State-Sponsored Economic Espionage, Jaylin Johnson

West Virginia Law Review

No abstract provided.

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Transcontinental Retroarc Sediment Routing Controlled By Subduction Geometry And Climate Change (Central And Southern Andes, Argentina), Eduardo Garzanti, Tomas Capaldi, Giovanni Vezzoli, Mara Limonta, Numa Sosa Sep 2021

Transcontinental Retroarc Sediment Routing Controlled By Subduction Geometry And Climate Change (Central And Southern Andes, Argentina), Eduardo Garzanti, Tomas Capaldi, Giovanni Vezzoli, Mara Limonta, Numa Sosa

Geoscience Faculty Research

Central Argentina from the Pampean flat-slab segment to northern Patagonia (27°–41°S) represents a classic example of a broken retroarc basin with strong tectonic and climatic control on fluvial sediment transport. Combined with previous research focused on coastal sediments, this actualistic provenance study uses framework petrography and heavy-mineral data to trace multistep dispersal of volcaniclastic detritus first eastwards across central Argentina for up to ca. 1,500 km and next northwards for another 760 km along the Atlantic coast. Although detritus generated in the Andes is largely derived from mesosilicic volcanic rocks of the cordillera, its compositional signatures reflect different tectono-stratigraphic levels …

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Opportunities For Youngstown In The Supply Chains Of Northeast Ohio And Pittsburgh Economies, Iryna Lendel, Iryna Demko, Georgina G. Figueroa Sep 2021

Opportunities For Youngstown In The Supply Chains Of Northeast Ohio And Pittsburgh Economies, Iryna Lendel, Iryna Demko, Georgina G. Figueroa

All Maxine Goodman Levin School of Urban Affairs Publications

The Center for Economic Development at Cleveland State University conducted this analysis to determine opportunities for the Youngstown economy in the supply chains of Northeast Ohio and Pittsburgh economies. Youngstown can account for a greater share of input purchases from the NEO and Pittsburgh regions by focusing on Nonferrous Metal (Except Aluminum) Production and Processing, Alumina and Aluminum Production and Processing, and Plastic Product Manufacturing. Youngstown can develop its economic ties with Pittsburgh’s economy in its aspirational sector – Financial Services.

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The Effect Of The Covid-19 Pandemic On Ohio Manufacturing, Iryna Lendel, Merissa Piazza, Madeline Frantz Sep 2021

The Effect Of The Covid-19 Pandemic On Ohio Manufacturing, Iryna Lendel, Merissa Piazza, Madeline Frantz

All Maxine Goodman Levin School of Urban Affairs Publications

The manufacturing sector is integral to Ohio’s economy, as it employed about 698,000 workers and produced an estimated $106.9 billion in output in 2019, before the onset of the COVID-19 pandemic. This report examines the subsequent effects of the pandemic on Ohio’s manufacturing industry by analyzing changes in its workforce and productivity between 2019 and 2020, as well as the strategies used by manufacturing companies to adapt to pandemic circumstances. We found that Ohio manufacturing employment decreased by 6.7% from 2019 to 2020, contrasting with an increase in GDP and productivity over the same period. This report explores possible explanations …

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Protecting Climate Change Law From A Revived Nondelegation Doctrine, Andrew Rockett Sep 2021

Protecting Climate Change Law From A Revived Nondelegation Doctrine, Andrew Rockett

Michigan Journal of Environmental & Administrative Law

In an era of political gridlock, a potential revitalization of the nondelegation doctrine threatens the Environmental Protection Agency’s existing framework for regulating greenhouse gas emissions and addressing the urgent threat of climate change. At its apex, the nondelegation doctrine briefly constrained permissible delegations from the legislature to the executive branch after two Supreme Court decisions in 1935. The doctrine has since weakened under the lenient “intelligible principle” standard. That standard today allows the legislative branch to make broad delegations to administrative arms of the executive branch, which then use technological and bureaucratic expertise to clarify, implement, and enforce statutes. The …

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Development Of Novel Ultra-High Performance Engineered Cementitious Composites (Uhp-Ecc) For Durable And Resilient Transportation Infrastructure, Gabriel A. Arce, Marwa Hassan, Daniel E. Game Sep 2021

Development Of Novel Ultra-High Performance Engineered Cementitious Composites (Uhp-Ecc) For Durable And Resilient Transportation Infrastructure, Gabriel A. Arce, Marwa Hassan, Daniel E. Game

Data

The objective of this study was to develop novel UHP-ECC materials utilizing readily available ingredients in Region 6 for the construction and repair of transportation infrastructure. Phase one of this study focused on the development of ultra-high strength cementitious matrices by evaluating the effects of ingredient selection and mixture proportioning on the materials’ compressive strength. Variables evaluated included the mass ratios of silica fume to fly ash (SF/FA), supplementary cementitious materials to cement (SCMs/C), and ordinary sand to microsilica sand (OS/MS). Phase two of the study focused on the development of UHP-ECC materials. To this end, based on the knowledge …

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Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio Sep 2021

Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio

Data

Corrosion inhibitors can be utilized to decrease the corrosion kinetics and therefore increase the durability of reinforced concrete structures. Recently, a green synthesized organic compound, 1-benzyl-4-phenyl-1H-1,2,3-triazole (BPT), was shown to be a successful green organic corrosion inhibitor for mild steel. Studies suggested that the BPT adsorbs chemically onto the steel and acts as a mixed inhibitor, suppressing both the anodic and cathodic corrosion kinetics of steel. In addition, microcapsules have shown to be an efficient way for a controlled inhibitor release in reinforced concrete structures. On the other hand, geopolymers (GPs) comprised of a long range of covalently bonded alumino-silicates, …

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Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio Sep 2021

Multifunctional Corrosion Control System As A Sustainable Approach For Reinforced Concrete Elements, Homero Castaneda, Miladin Radovic, Brendy Rincon, Oladis Troconis, Arturo Montoya, Changkyu Kim, Loreto Dacio

Publications

Corrosion inhibitors can be utilized to decrease the corrosion kinetics and therefore increase the durability of reinforced concrete structures. Recently, a green synthesized organic compound, 1-benzyl-4-phenyl-1H-1,2,3-triazole (BPT), was shown to be a successful green organic corrosion inhibitor for mild steel. Studies suggested that the BPT adsorbs chemically onto the steel and acts as a mixed inhibitor, suppressing both the anodic and cathodic corrosion kinetics of steel. In addition, microcapsules have shown to be an efficient way for a controlled inhibitor release in reinforced concrete structures. On the other hand, geopolymers (GPs) comprised of a long range of covalently bonded alumino-silicates, …

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Deep Reinforcement Learning-Based Project Prioritization For Rapid Post-Disaster Recovery Of Transportation Infrastructure Systems, Yongcheol Lee, Kunhee Choi Ph.D, Pedram Ghannad Sep 2021

Deep Reinforcement Learning-Based Project Prioritization For Rapid Post-Disaster Recovery Of Transportation Infrastructure Systems, Yongcheol Lee, Kunhee Choi Ph.D, Pedram Ghannad

Data

Among various natural hazards that threaten transportation infrastructure, flooding represents a major hazard in Region 6's states to roadways as it challenges their design, operation, efficiency, and safety. The catastrophic flooding disaster event generally leads to massive obstruction of traffic, direct damage to highway/bridge structures/pavement, and indirect damages to economic activities and regional communities that may cause loss of many lives. After disasters strike, reconstruction and maintenance of an enormous number of damaged transportation infrastructure systems require each DOT to take extremely expensive and long-term processes. In addition, planning and organizing post-disaster reconstruction and maintenance projects of transportation infrastructures are …

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Efficient, Low-Cost Bridge Cracking Detection And Quantification Using Deep-Learning And Uav Images, Chao Sun, Xiangyu Meng, Joshua O. Ogbebor, Shaopan Guo Sep 2021

Efficient, Low-Cost Bridge Cracking Detection And Quantification Using Deep-Learning And Uav Images, Chao Sun, Xiangyu Meng, Joshua O. Ogbebor, Shaopan Guo

Data

Many bridges in the State of Louisiana and the United States are working under serious degradation conditions where cracks on bridges threaten structural integrity and public security. To ensure structural integrity and public security, it is required that bridges in the US be inspected and rated every two years. Currently, this biannual assessment is largely implemented using manual visual inspection methods, which is slow and costly. In addition, it is challenging for workers to detect cracks in regions that are hard to reach, e.g., the top part of the bridge tower, cables, mid-span of the bridge girders, and decks. This …

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Efficient, Low-Cost Bridge Cracking Detection And Quantification Using Deep-Learning And Uav Images, Chao Sun, Xiangyu Meng, Joshua O. Ogbebor, Shaopan Guo Sep 2021

Efficient, Low-Cost Bridge Cracking Detection And Quantification Using Deep-Learning And Uav Images, Chao Sun, Xiangyu Meng, Joshua O. Ogbebor, Shaopan Guo

Publications

Many bridges in the State of Louisiana and the United States are working under serious degradation conditions where cracks on bridges threaten structural integrity and public security. To ensure structural integrity and public security, it is required that bridges in the US be inspected and rated every two years. Currently, this biannual assessment is largely implemented using manual visual inspection methods, which is slow and costly. In addition, it is challenging for workers to detect cracks in regions that are hard to reach, e.g., the top part of the bridge tower, cables, mid-span of the bridge girders, and decks. This …

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Rapid Repair Of Cracks On The Embankment Slopes Using Bio-Cement, Hai Lin, Guantao Cheng Sep 2021

Rapid Repair Of Cracks On The Embankment Slopes Using Bio-Cement, Hai Lin, Guantao Cheng

Data

This research explored the feasibility of using Microbially Induced Carbonate Precipitation (MICP) to improve fine-grained soil mechanical properties, seal the soil cracks, and assess the improvement of MICP on slope stability. The conducted research tasks include (1) direct shear tests to investigate the mechanical behavior and biogeochemical reactions of low-plasticity silt treated by MICP, (2) cyclic wetting-drying tests to assess the feasibility of using MICP to seal and waterproof the soil cracks, and (3) SLOPE/W modeling of a slope treated by MICP. Direct shear tests were used to evaluate the shear responses of the low-plasticity silt under different overburden pressures …

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A Tale Of Two Representations: Energy And Time In Photoabsorption, A. R.P. Rau Sep 2021

A Tale Of Two Representations: Energy And Time In Photoabsorption, A. R.P. Rau

Faculty Publications

This essay is based on a talk at Advances in Atomic, Molecular, and Optical Sciences 2020 (AAMOS20) in a symposium honoring Prof. S. T. Manson's decades-long contribution to photoabsorption studies. Quantum physics introduced into physics pairs of conjugate quantities bearing a specific complementary relationship, energy and time being one such pair. This gives rise to two alternative representations, a time-dependent and a time-independent one, seemingly very different but both capable of embracing the same physics. They give complementary descriptions and insight, with technical questions, theoretical and experimental, determining which may be the more convenient and practicable at any juncture. Two …

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Directly Determined Properties Of Hd 97658 From Interferometric Observations, Tyler G. Ellis, Tabetha Boyajian, Kaspar Von Braun, Roxanne Ligi, Denis Mourard, Diana Dragomir, Gail H. Schaefer, Christopher D. Farrington Sep 2021

Directly Determined Properties Of Hd 97658 From Interferometric Observations, Tyler G. Ellis, Tabetha Boyajian, Kaspar Von Braun, Roxanne Ligi, Denis Mourard, Diana Dragomir, Gail H. Schaefer, Christopher D. Farrington

Faculty Publications

We conducted interferometric observations with the CHARA Array of transiting super-Earth host HD 97658 and measured its limb-darkened angular diameter to be theta(LD) = 0.314 +/- 0.004 mas. The combination of the angular diameter with the Gaia EDR3 parallax value with zero-point correction (pi = 46.412 +/- 0.022 mas, d =21.546 +/- 0.011 pc) yields a physical radius of R-star = 0.728 +/- 0.008 R-circle dot. We also measured the bolometric flux of the star to be F-bol = 2.42 +/- 0.05 x 10(-8) erg s(-1) cm(-2), which, together with angular size, allows a measurement of the effective temperature T-eff …

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