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Physical Sciences and Mathematics

Selected Works

2019

Articles 31 - 41 of 41

Full-Text Articles in Engineering

Effect Of Biomass Inlet Concentration On Mixing In A Double Screw Pyrolyzer, Breanna L. Marmur, Theodore J. Heindel Apr 2019

Effect Of Biomass Inlet Concentration On Mixing In A Double Screw Pyrolyzer, Breanna L. Marmur, Theodore J. Heindel

Breanna L. Marmur

The renewable energy industry relies on double screw pyrolyzers to convert cellulosic biomass into bio-oil. Bio-oil can then be converted into synthetic gasoline, diesel, and other transportation fuels, or can be converted into biobased chemicals for a wide range of applications. One of the processes by which bio-oil is produced in industry today is through fast pyrolysis, the fast thermal decomposition of organic material in the absence of oxygen. One type of pyrolyzer, a double screw pyrolyzer, features two intermeshing screws encased in a reactor which mechanically conveys and mixes the biomass and heat carrier media. The mixing effectiveness of …

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Effects Of Disorder On Thermoelectric Properties Of Semiconducting Polymers, Zlatan Aksamija, Dhandapani Venkataraman, Connor J. Boyle, Meenakshi Upadhyaya Apr 2019

Effects Of Disorder On Thermoelectric Properties Of Semiconducting Polymers, Zlatan Aksamija, Dhandapani Venkataraman, Connor J. Boyle, Meenakshi Upadhyaya

Zlatan Aksamija

Organic materials have attracted recent interest as thermoelectric (TE) converters due to their low cost and ease of fabrication. We examine the effects of disorder on the TE properties of semiconducting polymers based on the Gaussian disorder model (GDM) for site energies while employing Pauli’s master equation approach to model hopping between localized sites. Our model is in good agreement with experimental results and a useful tool to study hopping transport. We show that stronger overlap between sites can improve the electrical conductivity without adversely affecting the Seebeck coefficient. We find that positional disorder aids the formation of new conduction …

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Modeling Pesticide Fate And Transport At Watershed Scale Using The Soil & Water Assessment Tool: General Applications And Mitigation Strategies, Ruoyu Wang Mar 2019

Modeling Pesticide Fate And Transport At Watershed Scale Using The Soil & Water Assessment Tool: General Applications And Mitigation Strategies, Ruoyu Wang

Ruoyu Wang

Pesticide residue runoff to surface water is of great concern to local stakeholders who seek to preserve or achieve good water quality. The Soil & Water Assessment Tool (SWAT) has been widely used to assess many environmental problems related to water resources and nonpoint-source pollution, including sediment and nutrient loads and pesticides. However, a comprehensive review of existing studies on SWAT-based pesticide modeling is still not available in the literature. Therefore, in this chapter, we present an overview summarizing all previous SWAT applications in studying the fate and transport of pesticides around the world, based on the peer-reviewed literature. We …

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Recent Developments In Solar Energy-Harvesting Technologies For Building Integration And Distributed Energy Generation, Mikhail Vasiliev, Mohammad Nur-E-Alam, Kamal Alameh Mar 2019

Recent Developments In Solar Energy-Harvesting Technologies For Building Integration And Distributed Energy Generation, Mikhail Vasiliev, Mohammad Nur-E-Alam, Kamal Alameh

Mikhail Vasiliev

We present a review of the current state of the field for a rapidly evolving group of
technologies related to solar energy harvesting in built environments. In particular, we focus
on recent achievements in enabling the widespread distributed generation of electric energy
assisted by energy capture in semi-transparent or even optically clear glazing systems and building
wall areas. Whilst concentrating on recent cutting-edge results achieved in the integration of
traditional photovoltaic device types into novel concentrator-type windows and glazings, we compare
the main performance characteristics reported with these using more conventional (opaque or
semi-transparent) solar cell technologies. A critical overview …

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Recent Developments In Solar Energy-Harvesting Technologies For Building Integration And Distributed Energy Generation, Mikhail Vasiliev, Mohammad Nur-E-Alam, Kamal Alameh Feb 2019

Recent Developments In Solar Energy-Harvesting Technologies For Building Integration And Distributed Energy Generation, Mikhail Vasiliev, Mohammad Nur-E-Alam, Kamal Alameh

Mikhail Vasiliev

We present a review of the current state of the field for a rapidly evolving group of technologies related to solar energy harvesting in built environments. In particular, we focus on recent achievements in enabling the widespread distributed generation of electric energy assisted by energy capture in semi-transparent or even optically clear glazing systems and building wall areas. Whilst concentrating on the cutting-edge recent results achieved in the integration of traditional photovoltaic device types into novel concentrator-type windows and glazings, we compare the main performance characteristics reported with these achievable using more conventional (opaque or semi-transparent) solar cell technologies. A …

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Decision Science For Community Development And Social Change, Michael P. Johnson Jr. Feb 2019

Decision Science For Community Development And Social Change, Michael P. Johnson Jr.

Michael P. Johnson

Operations research, also known as management science or decision science, is a mathematics-based discipline that draws from engineering, information systems, management, public policy and planning. OR enables individuals and organizations to make better decisions regarding manufacturing and logistics, service provision and strategy design. My particular interest in OR focuses on the needs of mission-driven and resource-constrained organizations that serve urban communities. In my talk I will describe how OR can use qualitative and quantitative analysis through meaningful engagement of communities to enable creative identification, formulation and solution of complex problems for local impact and social justice. Specific applications I'm currently …

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Urban Flow And Small Unmanned Aerial System Operations In The Built Environment, Kevin A. Adkins Feb 2019

Urban Flow And Small Unmanned Aerial System Operations In The Built Environment, Kevin A. Adkins

Kevin A. Adkins, PhD

The Federal Aviation Administration (FAA) has put forth a set of regulations (Part 107) that govern small unmanned aerial system (sUAS) operations. These regulations restrict unmanned aircraft (UA) from flying over people and their operation to within visual line of sight (VLOS). However, as new applications for unmanned aerial systems (UAS) are discovered, their capabilities improve, and regulations evolve, there is an increasing desire to undertake urban operations, such as urban air mobility, package delivery, infrastructure inspection, and surveillance. This built environment poses new weather hazards that include enhanced wind shear and turbulence. The smaller physical dimensions, lower mass and …

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Dengan Sendirinya Dapat Sembuh Dan Rontok Kutil Di Penis Dan Anus Dengan Obat Ini, Alif Nur Feb 2019

Dengan Sendirinya Dapat Sembuh Dan Rontok Kutil Di Penis Dan Anus Dengan Obat Ini, Alif Nur

Alif Nur

dengan sendirinya dapat sembuh dan rontok kutil di penis dan anus dengan obat ini Salam berbahagia dan sehat selalu Anda sedang bingung mencari kesana kesini pengobatan yang cocok untuk anda atau keluarga maupun pasangan anda, mungkin anda juga sudah mencari dan menemukannya namun belum juga cocok dalam pengobatannya. Disini kita ingin menawarkan solusi terbaik dan mudah untuk obat penyakit yang sedang anda ingin obati coba klik disini untuk penawaran yang menarik untuk lebih menyakinkan anda. Dari jaman ke jaman dunia pengobatan semakin mengalami perubahan demi kemajuan dunia pengobatan. Rempah rempah merupakan hasil alam terbaik Negara Indonesia yang memang pengobatan dengan …

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Suas: Cybersecurity Threats, Vulnerabilities, And Exploits, Philip Craiger, Gary Kessler, William Rose Jan 2019

Suas: Cybersecurity Threats, Vulnerabilities, And Exploits, Philip Craiger, Gary Kessler, William Rose

J. Philip Craiger, Ph.D.

The FAA predicts that purchases of hobbyist small unmanned aerial systems (sUAS) will grow from 1.9 million in 2016 to 4.3 million by 2020, and commercial sUAS to increase from 600,000 in 2016 to 2.7 million by 2020. sUAS, often referred to as 'drones,' are comprised of aeronautical hardware, a CPU, RAM, onboard storage, radio frequency communications, sensors, a camera, and a controller used by the pilot-in-command (PIC). Some have argued that a sUAS is essentially a flying computer. As such, sUAS are sometimes susceptible to many of the types of attacks that are often used on PC-based computers attached …

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Call For Abstracts - Resrb 2019, July 8-9, Wrocław, Poland, Wojciech M. Budzianowski Dec 2018

Call For Abstracts - Resrb 2019, July 8-9, Wrocław, Poland, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.

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Uas Flight Operations In Complex Terrain: Assessing The Agricultural Impact From Hurricane Maria In The Central Mountainous Region Of Puerto Rico, Kevin A. Adkins Dec 2018

Uas Flight Operations In Complex Terrain: Assessing The Agricultural Impact From Hurricane Maria In The Central Mountainous Region Of Puerto Rico, Kevin A. Adkins

Kevin A. Adkins, PhD

Hurricane Maria struck Puerto Rico in September 2017 as a Category 4 storm causing major damage to infrastructure, agriculture and natural ecosystems, as well as the loss of many lives. Among the crops hardest hit was coffee, one of the most important crops in Puerto Rico. As a perennial system, coffee takes various production forms along a gradient from high shade/biodiversity coffee farms to low shade coffee monocultures and therefore offers an ideal means for the study of resistance and resilience of an agroecosystem to weather and climate disturbance. During the summer of 2018, 14 impacted farms across the production …

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