Digital Commons Network^™

Numerical Analysis Of The Performance Of A Three-Bladed Vertical-Axis Turbine With Active Pitch Control Using A Coupled Unsteady Reynolds-Averaged Navier-Stokes And Actuator Line Model, Rui Wen Zhao, Angus C.W. Creech, Ye Li, Vengatesan Venugopal, Alistair G.L. Borthwick

School of Engineering, Computing and Mathematics

In this paper, we present a numerical model of a vertical-axis turbine (VAT) with active-pitch torque control. The model is based upon the Wind and Tidal Turbine Embedded Simulator (WATTES) and WATTES-V turbine realisations in conjunction with the actuator line method (ALM), and uses OpenFOAM to solve the unsteady Reynolds-averaged Navier-Stokes (URANS) equations with two-equation k - ε turbulence closure. Our novel pitch-controlled system is based on an even pressure drop across the entire rotor to mitigate against dynamic stall at low tip speed ratio. The numerical model is validated against experimental measurements and alternative numerical predictions of the hydrodynamic …

Study Of Gas Phase Ion Mutual-Neutralization Through Molecular And Langevin Dynamics Trajectory Simulation, Zhibo Liu

Electronic Theses and Dissertations Archive

Mutual-neutralization (MN) of cation-anion pairs is one of the key processes that determines the chemical compositions of reacting gas mixtures found in combustion, plasmas, and cosmic gas clouds. In the last few decades, experiments and modeling investigations have been conducted in free-molecular limit. However, the MN process is less extensively studied at near or beyond atmospheric pressure for relevant applications and the measured rate constant shows a clear pressure dependency. The present work focuses on developing a method based on trajectory simulation for a pressure range from the free molecular limit to atmospheric pressure. Langevin dynamics is incorporated to capture …

Survey Of Personalized Learning Software Systems: A Taxonomy Of Environments, Learning Content, And User Models, Heba Ismail, Nada Hussein, Saad Harous, Ashraf Khalil

All Works

This paper presents a comprehensive systematic review of personalized learning software systems. All the systems under review are designed to aid educational stakeholders by personalizing one or more facets of the learning process. This is achieved by exploring and analyzing the common architectural attributes among personalized learning software systems. A literature-driven taxonomy is recognized and built to categorize and analyze the reviewed literature. Relevant papers are filtered to produce a final set of full systems to be reviewed and analyzed. In this meta-review, a set of 72 selected personalized learning software systems have been reviewed and categorized based on the …

Current Developmental Challenges In Nepal: How Can The Diaspora Help?, Ambika P. Adhikari

Himalayan Research Papers Archive

Nepal now enjoys a unique opportunity to positively transform the country’s economy and society. The economic activities fueled by remittance, supported by foreign aid, and aided by domestic economic activities such as tourism, trade, and services, including start-ups, are helping increase individual incomes. However, the earnings from remittances, which measure to about 25% of Nepal’s GDP, are spent on consumer goods and not on investments that can generate employment and raise the standards of living. The foreign aid is often donor driven and also not always well managed and wisely spent on national priorities. Further, it is frequently marred by …

Two-Particle Azimuthal Correlations In Γp Interactions Using Ppb Collisions At √SNn=8.16tev, A. Tumasyan

Department of Physics and Astronomy: Faculty Publications

The first measurements of the Fourier coefficients (V_nΔ) of the azimuthal distributions of charged hadrons emitted from photon-proton (γp) interactions are presented. The data are extracted from 68.8nb⁻¹of ultra-peripheral proton-lead (pPb) collisions at √s_NN=8.16 TeVusing the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This γp system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The V_nΔ coefficients are presented in ranges of event multiplicity and transverse momentum …

China’S Governance: Strategy Choice And Future Vision For Combating Desertification, Guipeng Cui, Chunlei Xiao, Jiaqiang Lei, Xiaosong Li, Yingshuang Bao, Qi Lu

Bulletin of Chinese Academy of Sciences (Chinese Version)

China has made remarkable achievements in combating desertification over the past 70 years. At present, China has entered a new stage of combating desertification while facing many problems such as large desertification land base and high difficulty in combating desertification, and it is more important to meet the national strategic needs of ecological construction, rural revitalization, and the development and utilization of renewable energy in desert, Gobi, and wasteland areas. The strategic choice of combating desertification in China in the new era is overall improvement and key breakthroughs. The core of the strategy is whole-area governance, innovation-driven, and technology integration. …

Implementation Path And Strategic Planning Of Winning The Battle Of “Three-North” And Reconstructing “New Three-North”, Qi Lu, Chunlei Xiao, Yingshuang Bao, Mengchun Cui, Xiaoming Cao, Xiao Que, Liu Yang, Guipeng Cui

Bulletin of Chinese Academy of Sciences (Chinese Version)

Over the past 45 years, China has accomplished great achievements in carrying out “Three-North” project. Through largescale vegetation construction, the trends of land desertification, soil salinization, soil erosion and the deterioration of people’s living environment in the “Three-North” areas have been effectively restrained. The people in the desert area are getting rid of poverty and living a healthy life. In the new era, the “Three-North” project has encountered new demands, new challenges and new opportunities, and it is urgent to achieve a significant transform and upgrade and to improve quality and efficiency. This paper summarizes the current situation of the …

The Battle On The Edge Of Hexi Corridor–Taklimakan Desert: Wind-Blown Sand Situation And Prevention Tasks Of Desertification Control, Jiaqiang Lei, Xin Gao, Yongcheng Zhao, Heqiang Du, Qing He, Hongjing Ren, Xiaoyu Meng, Zihao Hu, Zuowei Yang

Bulletin of Chinese Academy of Sciences (Chinese Version)

In order to implement the spirit of General Secretary Xi Jinping’s important speech on strengthening the comprehensive control of desertification and promoting key ecological engineering projects such as the “Three-North Shelterbelt Program”, this study is designated to make concrete efforts to win the battle against desertification on the edge of Hexi Corridor—Taklimakan Desert. The study deeply explores the situation of wind-blown sand flux and prevention tasks in the area. Based on the characteristics of desertified land and wind-blown sand activities on the edge of Hexi Corridor—Taklimakan Desert, the goal is set to effectively prevent the spread of sand and control …

Connotation And Countermeasures Of Scientific Research Paradigm Transformation In The New Era, Peng Du, Bingyu Zhao, Li Sun, Xiaojing Sha, Liqian Zhang, Zidan Wang

Bulletin of Chinese Academy of Sciences (Chinese Version)

The purpose of this study is to comprehensively explore the main connotation and important impact of scientific research paradigm change from both theoretical and practical perspectives. On the theoretical level, starting with Kuhn and his The Structures of the Scientific Revolution, this study explores the logical essence of the concept of “paradigm”. At the practical level, through various forms such as questionnaires and interviews, the three connotations of scientific research paradigm change in the new era have been condensed. Namely, solving systematic and complex problems has become the main driving force for scientific research paradigm change in the new era, …

Philosophy Of Meta Publishing And Practice Of Platform Construction Toward Open Science, Jiansheng Qu, Chunjiang Liu, Qianfei Tian, Kemin Huang, Enbo Jiang

Bulletin of Chinese Academy of Sciences (Chinese Version)

Based on full investigation of the field of open publishing at home and abroad, this study expounds the role of open science in promoting the evolution of academic exchange system and mechanism, focuses on analyzing and summarizing the historical evolution, development change, and evolution law of academic publishing mode, and puts forward the meta-publishing concept that meets the needs of the open science era, so as to adapt to the development evolution and mode transformation of academic publishing. Based on the concept of “meta-publishing”, the idea of building a meta-publishing platform is proposed to promote the construction of a new …

Technological Innovation And Development In China’S Banking Industry: Problems And Countermeasures, Chuhan Zhang, Jichang Dong, Zhi Dong, Xiuting Li

Bulletin of Chinese Academy of Sciences (Chinese Version)

With the deep integration of science and technology into industrial transformation, the technological innovation in China’s banking industry has reached a new level with growing capacity for innovation, relying on the “dual-wheel” innovation-driven development of business and technology. However, there are still problems and challenges for the technological innovation and development in China’s banking industry, such as concerns about the safety of key information infrastructure and high dependence on foreign sources for core technology. It is urgent to build a relatively complete, self-reliant, stable, and secure banking technology system. This study reviews the development process and main achievements of technological …

Devoting Continuous Efforts To Innovations And Development Of Ruminant Livestock Life-Cycle Nutrition Program, Zhixiong He, Zhaomin Hu, Hongsheng Wang, Jinzhen Jiao, Xuefeng Han, Yong Liu, Shaoxun Tang, Chuanshe Zhou, Min Wang, Zhiliang Tan

Bulletin of Chinese Academy of Sciences (Chinese Version)

Ruminant livestock such as cattle and sheep can provide high-quality beef, mutton and milk, which are high-quality protein sources meeting the increasingly diverse food consumption needs for human being. Developing high-quality herbivorous animal husbandry is a concrete practice of practicing the “Greater Food” approach. The precise supply of forages and concentrates meeting the requirements of all nutrients in the whole life cycle is vital for cost saving and efficiency increasing of ruminant livestock industry, which is an important way to high-quality development. The whole life cycle nutrition is developed on the basis of traditional ruminant nutrition and new technologies made …

Information Literacy In The Sciences: Strategies For Engaging Undergraduate Learners In The Classroom, Justin Savage, Siobhan Mccarthy

University Libraries Scholarship and Creative Works

No abstract provided.

Assessing The Performance Of Exchange-Correlation Functionals On Lattice Constants Of Binary Solids At Room Temperature Within The Quasiharmonic Approximation, Xiaofei Shao, Peitao Liu, Cesare Franchini, Yi Xia, Jiangang He

Mechanical and Materials Engineering Faculty Publications and Presentations

The exchange-correlation functional is at the core of density functional theory (DFT) and determines the accuracy of DFT in describing the interactions among electrons/ions in solids and molecules. The strongly constrained and appropriately normed functional (SCAN) and its derivatives, regularized SCAN (rSCAN) and regularized-restored SCAN (r2SCAN), are particularly promising due to their remarkable overall accuracy in the description of various properties while retaining a high computational efficiency as compared to hybrid functionals. However, an exhaustive assessment on the performance of these functionals in predicting the finite-temperature lattice constant of solids is still lacking. Here, we systematically study the room-temperature lattice …

Structures Of Channelrhodopsin Paralogs In Peptidiscs Explain Their Contrasting K+ And Na+ Selectivities, Takefumi Morizumi, Kyumhyuk Kim, Hai Li, Elena G Govorunova, Oleg A Sineshchekov, Lei Zheng, Ana-Nicoleta Bondar, Azam Askari, Leonid S Brown, John L Spudich, Oliver P Ernst

Faculty, Staff and Student Publications

Kalium channelrhodopsin 1 from Hyphochytrium catenoides (HcKCR1) is a light-gated channel used for optogenetic silencing of mammalian neurons. It selects K+ over Na+ in the absence of the canonical tetrameric K+ selectivity filter found universally in voltage- and ligand-gated channels. The genome of H. catenoides also encodes a highly homologous cation channelrhodopsin (HcCCR), a Na+ channel with >100-fold larger Na+ to K+ permeability ratio. Here, we use cryo-electron microscopy to determine atomic structures of these two channels embedded in peptidiscs to elucidate structural foundations of their dramatically different cation selectivity. Together with structure-guided mutagenesis, we show …

Measuring And Enhancing The Ionic Conductivity Of Chloroaluminate Electrolytes For Al-Ion Batteries, Anthony J Lucio, Iwan Sumarlan, Elena Bulmer, Igor Efimov, Stephen Viles, Christopher J Zaleski

Faculty, Staff and Student Publications

At the core of the aluminum (Al) ion battery is the liquid electrolyte, which governs the underlying chemistry. Optimizing the rheological properties of the electrolyte is critical to advance the state of the art. In the present work, the chloroaluminate electrolyte is made by reacting AlCl3 with a recently reported acetamidinium chloride (Acet-Cl) salt in an effort to make a more performant liquid electrolyte. Using AlCl3:Acet-Cl as a model electrolyte, we build on our previous work, which established a new method for extracting the ionic conductivity from fitting voltammetric data, and in this contribution, we validate the method across a …

Study Of Polytopic Membrane Protein Topological Organization As A Function Of Membrane Lipid Composition, Oleg A Sineshchekov, Ana-Nicoleta Bondar, Azam Askari, Leonid S Brown, John L Spudich, Oliver P Ernst

Faculty, Staff and Student Publications

Kalium channelrhodopsin 1 from Hyphochytrium catenoides (HcKCR1) is a light-gated channel used for optogenetic silencing of mammalian neurons. It selects K+ over Na+ in the absence of the canonical tetrameric K+ selectivity filter found universally in voltage- and ligand-gated channels. The genome of H. catenoides also encodes a highly homologous cation channelrhodopsin (HcCCR), a Na+ channel with >100-fold larger Na+ to K+ permeability ratio. Here, we use cryo-electron microscopy to determine atomic structures of these two channels embedded in peptidiscs to elucidate structural foundations of their dramatically different cation selectivity. Together with structure-guided mutagenesis, we show that K+ versus Na+ …

Engineered Reporter Phages For Detection Of Escherichia Coli, Enterococcus, And Klebsiella In Urine, Susanne Meile, Jonas Marschall, Et Al.

2020-Current year OA Pubs

The rapid detection and species-level differentiation of bacterial pathogens facilitates antibiotic stewardship and improves disease management. Here, we develop a rapid bacteriophage-based diagnostic assay to detect the most prevalent pathogens causing urinary tract infections: Escherichia coli, Enterococcus spp., and Klebsiella spp. For each uropathogen, two virulent phages were genetically engineered to express a nanoluciferase reporter gene upon host infection. Using 206 patient urine samples, reporter phage-induced bioluminescence was quantified to identify bacteriuria and the assay was benchmarked against conventional urinalysis. Overall, E. coli, Enterococcus spp., and Klebsiella spp. were each detected with high sensitivity (68%, 78%, 87%), specificity (99%, 99%, …

Bayesian Multivariate Nonlinear State Space Copula Models, A Kreuzer, L Dalla Valle, C Czado

School of Engineering, Computing and Mathematics

A novel flexible class of multivariate nonlinear non-Gaussian state space models, based on copulas, is proposed. Specifically, it is assumed that the observation equation and the state equation are defined by copula families that are not necessarily equal. Inference is performed within the Bayesian framework, using the Hamiltonian Monte Carlo method. Simulation studies show that the proposed copula-based approach is extremely flexible, since it is able to describe a wide range of dependence structures and, at the same time, allows us to deal with missing data. The application to atmospheric pollutant measurement data shows that the approach is suitable for …

Vol. 5 No. 5, Glen Goodknight

Mythprint

Mythprint is the quarterly bulletin of the Mythopoeic Society, a nonprofit educational organization devoted to the study, discussion, and enjoyment of myth and fantasy literature, especially the works of J.R.R. Tolkien, C.S. Lewis, and Charles Williams. To promote these interests, the Society publishes three magazines, maintains a World Wide Web site, and sponsors the annual Mythopoeic Conference and awards for fiction and scholarship, as well as local discussion groups.

Phenomenological Ontology: Turning To Practice, Kaustuv Roy

Turning Toward Being: The Journal of Ontological Inquiry in Education

Ontology is often reduced to epistemology, that is, to yet another conceptual category for discussion. We do this because historically we are comfortable with the mental and are habituated to reducing everything to mental representation. But ontology is not rational discussion of ‘what is’; it is, rather, the cultivation of contact with ‘what is.’ And that means practice. We shy away from practice as though it is some native witchcraft, and prefer instead to think about it. The present paper proposes that instead of merely thinking about ontology, we practice toward its realization. I call this phenomenological ontology. Ontological practice …

Learning That Matters Is Messy: Experiments Revealing Hidden Potential In Higher Education, Ryan Derby-Talbot

Turning Toward Being: The Journal of Ontological Inquiry in Education

Why are some learning experiences so profound that they alter our worlds, whereas others don’t end up sticking at all? The author investigates this question in the context of undergraduate education, recounting several educational experiments that highlight subtle but powerful aspects of the student learning experience. By exploring a different approach to teaching a math course, an alternative framework for academic specialization instead of traditional majors, and a radical approach to designing new institutions, an encounter with the hidden, ontological dimension of learning becomes possible. Accessing the ontological experience of the learner opens up new possibilities for meaningful, deep, and …

Cryptocurrency: Regulate Or Facilitate? How States' Approaches To Cryptocurrency Can Be Applied On A Federal Level, Kelly Mahoney

Journal of the National Association of Administrative Law Judiciary

Within the past two years, the cryptocurrency market exceeded a record $2 trillion. As of November 2021, there are seventy-five million Bitcoin (a type of cryptocurrency) users and counting. Many states have implemented regulations and policies in response to this massive growth of the crypto market. While some states like Wyoming and Texas welcome cryptocurrency other states, such as New York and Washington, are more apprehensive and seek to constrain cryptocurrency due to its volatility and novelty. In contrast, federal agencies are still debating on how to address cryptocurrency, and glimpses of federal regulation can be seen through the 2021 …

A Molten Salt Test Loop For Component And Instrumentation Testing, T L. Head, Allison M. Berry, Keaton J. Brewster, Robert L. Brown, Hailey N. Burden, Reuben Byrd, Timothy Doty, Jess Dowdy, Kameron A. Hill, R. A. Jinkerson, Timothy J. Kennedy, Ronald C. Laehn, Dakotah Martinez, Samuel L. Mulder, Charles Onstead, Kim L. Pamplin, Dylan C. Pfeifer, Michael B. Ranger, Aaron D. Robison, Nathaniel T. Rowlands, Raymond E. Smith, Matthew T. Steele, R. S. Towell, Travis Towell, Olive Tuyishimire, T. S. Watson

Chemistry and Biochemistry

Molten salt is an effective coolant for a wide range of applications, including nuclear reactors, concentrated solar power, and other high temperature industrial heat transfer processes. The technical readiness level of components and instrumentation for high-temperature molten salt applications needs improvement for molten salt to be more widely adopted. A molten salt test loop was designed, built, and commissioned as a test bed to address these issues. The molten salt test loop at Abilene Christian University was built out of 316 stainless steel with a forced flow centrifugal-type pump, and was instrumented for remote operation. A low-temperature molten nitrate salt …

Topological Data Analysis Of Convolutional Neural Networks Using Depthwise Separable Convolutions, Eliot Courtois

Dissertations

In this dissertation, we present our contribution to a growing body of work combining the fields of Topological Data Analysis (TDA) and machine learning. The object of our analysis is the Convolutional Neural Network, or CNN, a predictive model with a large number of parameters organized using a grid-like geometry. This geometry is engineered to resemble patches of pixels in an image, and thus CNNs are a conventional choice for an image-classifying model.

CNNs belong to a larger class of neural network models, which, starting at a random initialization state, undergo a gradual fitting (or training) process, often a …

An Ai-Based Intervention For Improving Undergraduate Stem Learning, Mohammad Rashedul Hasan, Bilal Khan

Department of Electrical and Computer Engineering: Faculty Publications

We present results from a small-scale randomized controlled trial that evaluates the impact of just-in-time interventions on the academic outcomes of N = 65 undergraduate students in a STEM course. Intervention messaging content was based on machine learning forecasting models of data collected from 537 students in the same course over the preceding 3 years. Trial results show that the intervention produced a statistically significant increase in the proportion of students that achieved a passing grade. The outcomes point to the potential and promise of just-in-time interventions for STEM learning and the need for larger fully-powered randomized controlled trials.

Unh And Exail Open New Maritime Autonomy Innovation Hub, Robbin Ray

Media Relations

No abstract provided.

Analyzing Nurse Perceptions Of Workplace Environments From A Statewide Initiative, Judith T. Caruso, Mildred Ortu Kowalski, Marilyn Mapp

Creating Healthy Work Environments (CHWE)

Hospitals demonstrated consistent and sustained improvement in work environments after implementation of Nursing Workplace Environment and Staffing Councils. With empirical outcomes and identification of best practices throughout the state, staff nurses and nurse leaders learned from each other about creative, positive initiatives to improve nurse well-being and work environments.

Levels Of Persistent Organic Pollutants (Pops) In The Antarctic Atmosphere Over Time (1980 To 2021) And Estimation Of Their Atmospheric Half-Lives, Thais Luarte, Victoria A. Gómez-Aburto, Ignacio Poblete-Castro, Eduardo Castro-Nallar, Nicolas Hunneus, Marco Molina-Montenegro, Claudia Egas, Germán Azcune, Andrés Pérez-Parada, Rainier Lohmann, Pernilla Bohlin-Nizzetto, Jordi Dachs, Susan Bengtson-Nash, Gustavo Chiang, Karla Pozo, Cristóbal J. Galbán-Malagón

Graduate School of Oceanography Faculty Publications

Persistent organic pollutants (POPs) are synthetic compounds that were intentionally produced in large quantities and have been distributed in the global environment, originating a threat due to their persistence, bioaccumulative potential, and toxicity. POPs reach the Antarctic continent through long-range atmospheric transport (LRAT). In these areas, low temperatures play a significant role in the environmental fate of POPs, retaining them for a long time due to cold trapping by diffusion and wet deposition, acting as a net sink for many POPs. However, in the current context of climate change, the remobilization of POPs that were trapped in water, ice, and …

The Forgotten Language Skill: Finding A Prominent Place For Listening In Meaningful Programming For Multilingual Learners With Learning Disabilities, Tracy Griffin Spies

Educational & Clinical Studies Faculty Research

Listening is the primary vehicle through which children learn, is fundamental to all other communication competencies, is a core component of multimodal instruction, and is key to learning language. At the same time, listening comprehension is the least understood language skill and is challenging for teachers in the provision of high quality instruction. For multilingual learners with learning disabilities it also presents certain challenges at the intersection of students’ disability and developing language proficiency. This article presents a conceptual analysis of listening comprehension across the perspectives of learning disability and second language acquisition in an effort to link disconnected understandings …