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2020

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Articles 1 - 30 of 12947

Full-Text Articles in Physical Sciences and Mathematics

Strategic Trampling To Conserve Soil Moisture In A Namibian Rangeland, I. Zimmermann, J. Labuschagne, V. K. Namupala Dec 2020

Strategic Trampling To Conserve Soil Moisture In A Namibian Rangeland, I. Zimmermann, J. Labuschagne, V. K. Namupala

International Grassland Congress Proceedings

No abstract provided.


Lactation Performance Of Murrah‐Improved Dairy Buffalo Grazing On Improved Pasture, G. R. Yang, A. K. Wang, J. C. Zhang, M. F. Fu, B. Z. Huang, X. P. Yuan, S. P. Yang Dec 2020

Lactation Performance Of Murrah‐Improved Dairy Buffalo Grazing On Improved Pasture, G. R. Yang, A. K. Wang, J. C. Zhang, M. F. Fu, B. Z. Huang, X. P. Yuan, S. P. Yang

International Grassland Congress Proceedings

No abstract provided.


Prediction Of Methane Emission Of Dairy Cows Offered Fresh Grass At Maintenance Level, Tianhai Yan, C. S. Mayne Dec 2020

Prediction Of Methane Emission Of Dairy Cows Offered Fresh Grass At Maintenance Level, Tianhai Yan, C. S. Mayne

International Grassland Congress Proceedings

No abstract provided.


Fattening Sheep In A Warm Shed To Compensate For Energy Deficiency In Winter In North‐West China, Jianping Wu, Zhe Liu, Lian Yang, David L. Michalk, Liping Zhang, Randall Jones, Zhaomin Lei Dec 2020

Fattening Sheep In A Warm Shed To Compensate For Energy Deficiency In Winter In North‐West China, Jianping Wu, Zhe Liu, Lian Yang, David L. Michalk, Liping Zhang, Randall Jones, Zhaomin Lei

International Grassland Congress Proceedings

No abstract provided.


The Nebraska Water Leaders Academy Graduates’ Influence On Community Capitals And Community Capacity, Dakota W. Staggs, Mark E. Burbach, Gina S. Matkin, Cheryl Burkhart-Kriesel Dec 2020

The Nebraska Water Leaders Academy Graduates’ Influence On Community Capitals And Community Capacity, Dakota W. Staggs, Mark E. Burbach, Gina S. Matkin, Cheryl Burkhart-Kriesel

Papers in Natural Resources

An overarching goal of the Nebraska Water Leaders Academy is to prepare a diverse group of Nebraskans from across the state to impact change in their communities by working together to solve wicked water problems. With 136 graduates from across Nebraska there is potential for graduates to effect change and impact their communities’ capitals (i.e., Built, Financial, Political, Social, Human, Cultural, and Natural). This study explored the impact of Academy graduates on their communities’ capitals and community capacity to prepare for future challenges from the perspective of graduates and community members. Findings show that Academy graduates are impacting their ...


A Deep Machine Learning Approach For Predicting Freeway Work Zone Delay Using Big Data, Abdullah Shabarek Dec 2020

A Deep Machine Learning Approach For Predicting Freeway Work Zone Delay Using Big Data, Abdullah Shabarek

Dissertations

The introduction of deep learning and big data analytics may significantly elevate the performance of traffic speed prediction. Work zones become one of the most critical factors causing congestion impact, which reduces the mobility as well as traffic safety. A comprehensive literature review on existing work zone delay prediction models (i.e., parametric, simulation and non-parametric models) is conducted in this research. The research shows the limitations of each model. Moreover, most previous modeling approaches did not consider user delay for connected freeways when predicting traffic speed under work zone conditions. This research proposes Deep Artificial Neural Network (Deep ANN ...


Dances And Escape Of The Vortex Quartet, Brandon Behring Dec 2020

Dances And Escape Of The Vortex Quartet, Brandon Behring

Dissertations

This dissertation considers the linear stability of a one-parameter family of periodic solutions of the four-vortex problem known as 'leapfrogging' orbits. These solutions, which consist of two pairs of identical yet oppositely-signed vortices, were known to W. Gröbli (1877) and A. E. H. Love (1883) and can be parameterized by a dimensionless parameter related to the geometry of the initial configuration. Simulations by Acheson and numerical Floquet analysis by Tophøj and Aref both indicate, to many digits, that the bifurcation occurs at a value related to the inverse square of the golen ratio. Acheson observed that, after an initial period ...


Modeling Mass Transfer And Chemical Reaction In Industrial Nitrocellulose Manufacturing Processes, Francis Patrick Sullivan Dec 2020

Modeling Mass Transfer And Chemical Reaction In Industrial Nitrocellulose Manufacturing Processes, Francis Patrick Sullivan

Dissertations

A series of models are proposed to describe the production of military grade nitrocellulose from dense cellulose materials in mixtures of nitric acid, sulfuric acid, and water. This effort is conducted to provide a predictive capability for analyzing the rate and extent of reaction achieved under a range of reaction conditions used in the industrial nitrocellulose manufacturing process for sheeted cellulose materials. Because this capability does not presently exist, nitrocellulose producers have historically relied on a very narrow range of cellulose raw materials and resorted to trial and error methods to develop processing conditions for new materials. This tool enables ...


Small-Scale Dynamics Of Photospheric Magnetic Activities And Their Chromospheric Responses, Jiasheng Wang Dec 2020

Small-Scale Dynamics Of Photospheric Magnetic Activities And Their Chromospheric Responses, Jiasheng Wang

Dissertations

The evolution of photospheric magnetic fields is considered as the fundamental source of forming atmospheric structures and triggering most solar activities, including flares and mass ejections on various scales (CMEs, jets, etc.). With the implementation of high-resolution observational instruments, small-scale details of magnetic features are recognized that can provide important information regarding the evolution in active regions and the connection between photospheric magnetic reconnection and jet-like ejections in the quiet Sun. This research takes advantage of the exceptionally high-resolution measurements of vector magnetic field and imaging observations by the Goode Solar Telescope, and UV/EUV imaging observations from space-based instruments ...


Molecular Mechanism Of Cyanobacteria Circadian Clock Oscillator And Effect Of Co Factors On Its Oscillation, Manpreet Kaur Dec 2020

Molecular Mechanism Of Cyanobacteria Circadian Clock Oscillator And Effect Of Co Factors On Its Oscillation, Manpreet Kaur

Dissertations

The circadian rhythms arise as an adaptation to the environmental 24-hour day and night cycle due to Earth's rotation. These rhythms prepare organisms to align their internal biological activities and day to day behavior or events with the environmental change of the 24-hour day and night cycle. Circadian rhythms are found widely in all living kingdoms of life on Earth. Cyanobacteria are photosynthetic prokaryotes which first used to study these circadian rhythms. Among cyanobacterial species, Synechococcus elongatus PCC 7942 (henceforth, S. Elongatus) is the simplest organism with a durable and sturdy circadian clock and is study as a model ...


Supporting User Interaction And Social Relationship Formation In A Collaborative Online Shopping Context, Yu Xu Dec 2020

Supporting User Interaction And Social Relationship Formation In A Collaborative Online Shopping Context, Yu Xu

Dissertations

The combination of online shopping and social media allow people with similar shopping interests and experiences to share, comment, and discuss about shopping from anywhere and at any time, which also leads to the emergence of online shopping communities. Today, more people turn to online platforms to share their opinions about products, solicit various opinions from their friends, family members, and other customers, and have fun through interactions with others with similar interests. This dissertation explores how collaborative online shopping presents itself as a context and platform for users' interpersonal interactions and social relationship formation through a series of studies ...


Coordination, Adaptation, And Complexity In Decision Fusion, Weiqiang Dong Dec 2020

Coordination, Adaptation, And Complexity In Decision Fusion, Weiqiang Dong

Dissertations

A parallel decentralized binary decision fusion architecture employs a bank of local detectors (LDs) that access a commonly-observed phenomenon. The system makes a binary decision about the phenomenon, accepting one of two hypotheses (H0 (“absent”) or H1 (“present”)). The k 1 LD uses a local decision rule to compress its local observations yk into a binary local decision uk; uk = 0 if the k 1 LD accepts H0 and uk = 1 if it accepts H1. The k 1 LD sends its decision uk over a noiseless dedicated channel to a Data Fusion Center (DFC). The DFC combines the local decisions ...


Enhancing Dissemination Of Evidence-Based Models For Stem Phd Career Development; A Stakeholder Workshop Report, Ryan Bixenmann, Barbara J. Natalizio, Yasmeen Hussain, Cynthia N. Fuhrmann Dec 2020

Enhancing Dissemination Of Evidence-Based Models For Stem Phd Career Development; A Stakeholder Workshop Report, Ryan Bixenmann, Barbara J. Natalizio, Yasmeen Hussain, Cynthia N. Fuhrmann

pd|hub Publications

Sustainability of the scientific enterprise requires being able to recruit, retain, and prepare ongoing generations of PhD-trained scientists ready to adapt with the evolving needs of the scientific workforce and society. This necessitates a broadened, trainee-centered view in doctoral and postdoctoral training—including a prominent focus on career planning, science across sectors, and development of professional skills. Although there is energy and movement to enhance graduate and postdoctoral training, actions remain disparate, leading to inefficiencies in implementation and lack of systemic change. In 2019, an emerging national initiative, Professional Development Hub (pd|hub), hosted a workshop to bring organizations and ...


Drone-Assisted Emergency Communications, Di Wu Dec 2020

Drone-Assisted Emergency Communications, Di Wu

Dissertations

Drone-mounted base stations (DBSs) have been proposed to extend coverage and improve communications between mobile users (MUs) and their corresponding macro base stations (MBSs). Different from the base stations on the ground, DBSs can flexibly fly over and close to MUs to establish a better vantage for communications. Thus, the pathloss between a DBS and an MU can be much smaller than that between the MU and MBS. In addition, by hovering in the air, the DBS can likely establish a Line-of-Sight link to the MBS. DBSs can be leveraged to recover communications in a large natural disaster struck area ...


Characterizing Reactive Iron Mineral Coatings And Their Roles In Natural Attenuation At A Site With Historical Contamination, Han Hua Dec 2020

Characterizing Reactive Iron Mineral Coatings And Their Roles In Natural Attenuation At A Site With Historical Contamination, Han Hua

Dissertations

Reactive iron mineral coatings in redox transition zones play an important role in contaminant attenuation. These mineral coatings include poorly crystalline to crystalline iron sulfides, carbonates, and oxyhydroxides, and are a signature of the biogeochemical processes occurring. To better understand these processes, reactive iron mineral coatings are characterized in an 18-m Anaerobic Core collected from a contaminated industrial site. This study targets redox transition zones uncovered in the core. A suite of complementary analyses is applied to distinguish the surface coating mineralogy using X-ray Diffraction, X-ray fluorescence, and field-emission scanning electron microscopy (FESEM) with energy dispersive X-ray analyzer (EDX). In ...


Relationship Between Hotels' Design Adequacy And Hoteliers' Perception Of Sustainable Energy Management In Abuja, Nigeria, Aisha Isa Shehu, Bala Ishiyaku, Hadiza Balarabe Kudan, Sani Inusa Milala Dec 2020

Relationship Between Hotels' Design Adequacy And Hoteliers' Perception Of Sustainable Energy Management In Abuja, Nigeria, Aisha Isa Shehu, Bala Ishiyaku, Hadiza Balarabe Kudan, Sani Inusa Milala

Journal of Environmental Science and Sustainable Development

Energy is a sustainability issue receiving primary global concern. Improving energy efficiency and utilizing renewable resources are important in building energy sustainability. An energy-efficient design is a basis for controlling energy efficiency in buildings, and it is highly motivated by the sustainable energy management perception of relevant stakeholders. Hotels have high energy intensities and high working costs. This study investigates the relationship between hotel design adequacy and hoteliers' perception of sustainable energy management in Abuja, Nigeria. The investigation embraces quantitative structure utilizing exploratory and elucidating techniques. The mean ranking and Pearson product-moment correlation results revealed substantial and weak positive correlations ...


Statistical Modeling Of Quarrying Activities And Their Impact On Residents’ Satisfaction, Jefferson M. Domingues, Vania F. L. Miranda, Denise C. Rezende, Yara S. Lares, Saulo R. Ferreira, Izabela R. C. De Oliveira Dec 2020

Statistical Modeling Of Quarrying Activities And Their Impact On Residents’ Satisfaction, Jefferson M. Domingues, Vania F. L. Miranda, Denise C. Rezende, Yara S. Lares, Saulo R. Ferreira, Izabela R. C. De Oliveira

Journal of Environmental Science and Sustainable Development

This research aims to analyse the impact of quarrying on the health and perception of neighbouring communities. A standard questionnaire survey was conducted to collect data from quarry neighbours in a residential neighbourhood located in the city of Lavras, Minas Gerais, Brazil. Residences were distributed based on proximity to a quarrying company, resulting in three distances divided by three equally distant radii, named as Area I (closest to the quarrying company at 630 m), Area II (730 m), and Area III (farthest from the quarrying company at 830 m). Data gathered from 177 residents were analysed with logistic regression models ...


Physical Parameters Of The Multiplanet Systems Hd 106315 And Gj 9827*†, Molly R. Kosiarek, David A. Berardo, Ian J. M. Crossfield, Cesar Laguna, Caroline Piaulet, Joseph M. Akana Murphy, Steve B. Howell, Gregory W. Henry, Howard Isaacson, Benjamin Fulton, Lauren M. Weiss, Erik A. Petigura, Aida Behmard, Lea A. Hirsch, Johanna Teske, Jennifer A. Burt, Sean M. Mills, Ashley Chontos, Teo Močnik, Andrew W. Howard, Michael Werner, John H. Livingston, Jessica Krick, Charles Beichman, Varoujan Gorjian, Laura Kreidberg, Caroline Morley, Jessie L. Christiansen, Farisa Y. Morales, Nicholas J. Scott, Jeffrey D. Crane, Sharon Xuesong Wang, Stephen A. Shectman, Lee J. Rosenthal, Samuel K. Grunblatt, Ryan A. Rubenzahl, Paul A. Dalba, Steven Giacalone, Chiara Dane Villanueva, Qingtian Liu, Fei Dai, Michelle L. Hill, Malena Rice, Stephen R. Kane, Andrew W. Mayo Dec 2020

Physical Parameters Of The Multiplanet Systems Hd 106315 And Gj 9827*†, Molly R. Kosiarek, David A. Berardo, Ian J. M. Crossfield, Cesar Laguna, Caroline Piaulet, Joseph M. Akana Murphy, Steve B. Howell, Gregory W. Henry, Howard Isaacson, Benjamin Fulton, Lauren M. Weiss, Erik A. Petigura, Aida Behmard, Lea A. Hirsch, Johanna Teske, Jennifer A. Burt, Sean M. Mills, Ashley Chontos, Teo Močnik, Andrew W. Howard, Michael Werner, John H. Livingston, Jessica Krick, Charles Beichman, Varoujan Gorjian, Laura Kreidberg, Caroline Morley, Jessie L. Christiansen, Farisa Y. Morales, Nicholas J. Scott, Jeffrey D. Crane, Sharon Xuesong Wang, Stephen A. Shectman, Lee J. Rosenthal, Samuel K. Grunblatt, Ryan A. Rubenzahl, Paul A. Dalba, Steven Giacalone, Chiara Dane Villanueva, Qingtian Liu, Fei Dai, Michelle L. Hill, Malena Rice, Stephen R. Kane, Andrew W. Mayo

Information Systems and Engineering Management Research Publications

HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets' ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectroscopy. Through a multiyear high-cadence observing campaign with Keck/High Resolution Echelle Spectrometer and Magellan/Planet Finder Spectrograph, we improved the planets' mass measurements in anticipation of Hubble Space Telescope transmission spectroscopy. For GJ 9827, we modeled activity-induced radial velocity signals with a Gaussian process informed by the Calcium II H&K lines in order ...


Applied Topology Ams 528, Harrison Dekker Dec 2020

Applied Topology Ams 528, Harrison Dekker

Library Impact Statements

No abstract provided.


Treated Hfo2 Based Rram Devices With Ru, Tan, Tin As Top Electrode For In-Memory Computing Hardware, Yuvraj Dineshkumar Patel Dec 2020

Treated Hfo2 Based Rram Devices With Ru, Tan, Tin As Top Electrode For In-Memory Computing Hardware, Yuvraj Dineshkumar Patel

Theses

The scalability and power efficiency of the conventional CMOS technology is steadily coming to a halt due to increasing problems and challenges in fabrication technology. Many non-volatile memory devices have emerged recently to meet the scaling challenges. Memory devices such as RRAMs or ReRAM (Resistive Random-Access Memory) have proved to be a promising candidate for analog in memory computing applications related to inference and learning in artificial intelligence. A RRAM cell has a MIM (Metal insulator metal) structure that exhibits reversible resistive switching on application of positive or negative voltage. But detailed studies on the power consumption, repeatability and retention ...


Containing The Spread Of Infectious Disease On College Campuses [Preprint], Mirai Shah, Gabrielle Ferra, Susan Fitzgerald, Paul J. Barreira, Pardis C. Sabeti, Andres Colubri Dec 2020

Containing The Spread Of Infectious Disease On College Campuses [Preprint], Mirai Shah, Gabrielle Ferra, Susan Fitzgerald, Paul J. Barreira, Pardis C. Sabeti, Andres Colubri

UMass Chan Medical School Faculty Publications

College campuses are highly vulnerable to infectious disease outbreaks, and there is a pressing need to develop better strategies to mitigate their size and duration, particularly as educational institutions around the world reopen to in-person instruction in the midst of the COVID-19 pandemic. Towards addressing this need, we applied a stochastic compartmental model to quantify the impact of university-level responses to past mumps outbreaks in college campuses and used it to determine which control interventions are most effective. Mumps is a very relevant disease in such settings, given its airborne mode of transmission, high infectivity, and recurrence of outbreaks despite ...


Accelerating Transitive Closure Of Large-Scale Sparse Graphs, Sanyamee Milindkumar Patel Dec 2020

Accelerating Transitive Closure Of Large-Scale Sparse Graphs, Sanyamee Milindkumar Patel

Theses

Finding the transitive closure of a graph is a fundamental graph problem where another graph is obtained in which an edge exists between two nodes if and only if there is a path in our graph from one node to the other. The reachability matrix of a graph is its transitive closure. This thesis describes a novel approach that uses anti-sections to obtain the transitive closure of a graph. It also examines its advantages when implemented in parallel on a CPU using the Hornet graph data structure.

Graph representations of real-world systems are typically sparse in nature due to lesser ...


Centering The Arts In Stem, Fay Cobb Payton Dec 2020

Centering The Arts In Stem, Fay Cobb Payton

The STEAM Journal

A reflection on a STEAM initiative: NC State University Alumni and their children attended free STEAM (Science, Technology, Engineering, Arts, and Math) family workshops at D.H. Hill Library. This program was a collaboration between Dr. Fay Cobb Payton, professor of Information Systems/Technology and University Faculty Scholar at NC State, the NCSU Libraries, and Arts NC State


Evolution Of Island, Dominique Kongsli Dec 2020

Evolution Of Island, Dominique Kongsli

The STEAM Journal

Evolution of Island emerged from the depths of an ocean of blue paint. My process involves observation of nature: I remember scuba diving in Thailand in the Andaman Sea and having a spiritual experience underwater while observing Christmas-tree worms pop in and out of the coral.


The Beautiful Math Of Everything And You Included, E. Ozie Dec 2020

The Beautiful Math Of Everything And You Included, E. Ozie

The STEAM Journal

This a reflection on how there is beautiful math to everything. An author's interpretation of matrices and mechanics in its relationship to someone's identity.


Drawing Parallels In Art Science For Collaborative Learning: A Case Study, Karen Westland Dec 2020

Drawing Parallels In Art Science For Collaborative Learning: A Case Study, Karen Westland

The STEAM Journal

This research paper explores drawing as a tool to facilitate interdisciplinary practice. Outlined is the personal experience of PhD researcher [name removed] in their physics/craft research project, combined with thoughts and opinions from collaborators gathered through group discursive interviews. Interdisciplinary projects face interpersonal and conceptually ambiguous challenges which can be addressed through adopting drawing techniques for educational purposes. Findings highlight that drawing can assist across a breadth of applications as a learning tool for everyone, regardless of drawing ability, to improve the functionality of collaborative projects. Specifically, drawing combined with other communication techniques develops a performative communicative approach that ...


Visual Arts Enhance Instruction In Observation And Analysis Of Microscopic Forms In Developmental And Cell Biology, Max Ezin, Christina Noravian, Amira Mahomed, Adam Lyle, Aveleen Gill, Tamira Elul Dec 2020

Visual Arts Enhance Instruction In Observation And Analysis Of Microscopic Forms In Developmental And Cell Biology, Max Ezin, Christina Noravian, Amira Mahomed, Adam Lyle, Aveleen Gill, Tamira Elul

The STEAM Journal

Two important skills for scientists in developmental and cell biology, as well as in fields such as neurobiology, histology and pathology, are: 1) observation of features and details in microscopic images of cells, and 2) quantification of cellular features observed in microscopic images. However, current training in developmental and cell biology does not emphasize observation and quantitative analysis of microscopic images, and it is unclear how best to teach students these skills. Here, we describe our experiences applying visual artistic approaches to instruct undergraduate and graduate students in how to observe and analyze cellular forms in microscopic images. At Loyola ...


Jack Of All Trades, Master Of Scifi, Scott Coon Dec 2020

Jack Of All Trades, Master Of Scifi, Scott Coon

The STEAM Journal

This is a reflection on skills and science fiction


Caee: Communication-Aware, Energy-Efficient Vm Placement Model For Multi-Tier Applications In Large Scale Cloud Data Centers, Soha Rawas, Ahmed Zekri Dec 2020

Caee: Communication-Aware, Energy-Efficient Vm Placement Model For Multi-Tier Applications In Large Scale Cloud Data Centers, Soha Rawas, Ahmed Zekri

BAU Journal - Science and Technology

the increasing demand for cloud computing services has led to the adoption of large-scale cloud data centers (DCs) to meet the user’s requirements. Efficiency and managing of such DCs have become a challenging problem. Consequently, energy-efficient solutions to optimize the whole DC energy consumption, optimize the application’s performance and reduce the cloud provider operational cost are crucial and needed. This paper addressed the problem of Virtual Machines (VMs) placement of multi-tier applications to maximize the compute resources utilization, minimize energy consumption, and reduce network traffic inside modern large-scale cloud DCs. The VM placement problem with communication dependencies among ...


Antibacterial Effect And Phytochemical Analysis Of The Shoot System Of Rubus Canescens Dc. Growing In Lebanon, Omar Assafiri, Hiba Abdallah, Mohammed El-Dakdouki Dec 2020

Antibacterial Effect And Phytochemical Analysis Of The Shoot System Of Rubus Canescens Dc. Growing In Lebanon, Omar Assafiri, Hiba Abdallah, Mohammed El-Dakdouki

BAU Journal - Science and Technology

The misuse of antibiotics followed by improved fitness of resistant strains of infectious microorganisms hindered the efficacy of many known antimicrobial agents, and fueled research for the discovery of novel remedies. The current study aims at assessing the antimicrobial activity and understanding the mechanism of action of Rubus canescens DC. growing wild in Lebanon, as well as qualitatively determining its phytochemical profile. The antibacterial activity, MIC, and MBC of the extracts were evaluated by two-fold dilution. Time-kill curves were plotted to assess the bactericidal activity of the R. canescens DC. extracts against the growth of microorganisms, and TEM images were ...