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Full-Text Articles in Engineering

An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler Mar 2104

An Analysis Of The Barriers To And Drivers Of Green Public Procurement In Achieving A More Sustainable Construction Industry, Myles Keaveney, Paul Butler

Conference papers

The public sector in Ireland possesses enormous purchasing power which has the strength to affect production and consumption trends in all market sectors. Environmental purchasing tools such as Green Public Procurement (GPP) are seen by many as the solution to greener purchasing decisions in order to obtain and maintain not only a more sustainable construction sector but also a more sustainable economy. The purpose of this research is to determine and examine the key barriers to and drivers of implementing GPP in public procurement departments in order to reduce the effect construction works have on the environment. There was limited ...


Design Of Microwave Lowpass Filters Based On Metamaterial Components, Mushtaq Ahmed Dec 2103

Design Of Microwave Lowpass Filters Based On Metamaterial Components, Mushtaq Ahmed

Mushtaq A. Alqaisy

No abstract provided.


Impact Of Chain Architecture On The Thickness Dependence Of Physical Aging Rate Of Thin Polystyrene Films, Gregory Brown, Elizabeth Lewis, Bryan D. Vogt Jan 2020

Impact Of Chain Architecture On The Thickness Dependence Of Physical Aging Rate Of Thin Polystyrene Films, Gregory Brown, Elizabeth Lewis, Bryan D. Vogt

Honors Research Projects

The dynamics of polymer thin films have been demonstrated to be significantly altered from the bulk, but the origins of such differences are not well defined. In this work, we seek to understand the differences in the structural dynamics (or physical aging) of polystyrene (PS) through branching and other well defined architectures (comb and centipede). The aging dynamics of ultrathin films (< 30 nm) differ from relatively thick films (100-150nm) with linear PS thin films aging more rapidly than the relatively “bulk-like” thick films. Ellipsometric measurements are used to characterize the physical aging rate of the films. The change in film thickness and refractive index as the films are held below the glass transition temperature (Tg) provides a simple measure of the physical aging. In this study, four different architectures (linear, comb, 4 arm star, and centipede) will be investigated. For each PS architecture, the aging rate will be determined for film thickness ranging ...


Stability Analysis Of A More General Class Of Systems With Delay-Dependent Coefficients, Chi Jin, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu May 2019

Stability Analysis Of A More General Class Of Systems With Delay-Dependent Coefficients, Chi Jin, Keqin Gu, Islam Boussaada, Silviu-Iulian Niculescu

SIUE Faculty Research, Scholarship, and Creative Activity

This paper presents a systematic method to analyse the stability of systems with single delay in which the coefficient polynomials of the characteristic equation depend on the delay. Such systems often arise in, for example, life science and engineering systems. A method to analyze such systems was presented by Beretta and Kuang in a 2002 paper, but with some very restrictive assumptions. This work extends their results to the general case with the exception of some degenerate cases. It is found that a much richer behavior is possible when the restrictive assumptions are removed. The interval of interest for the ...


Csar 62 Spin Curve, Mohsen Azadi, Georgia Griggs, Glen De Villafranca, Gerald Lopez Dec 2018

Csar 62 Spin Curve, Mohsen Azadi, Georgia Griggs, Glen De Villafranca, Gerald Lopez

Protocols and Reports

No abstract provided.


Wyoming Wheels, David Tobin Dec 2018

Wyoming Wheels, David Tobin

Honors Theses AY 17/18

Manual wheelchair users traditionally suffer from an increased risk of chronic shoulder injury and the inability to travel quickly or uphill independently. Beginning as a senior design project in fall of 2016, Wyoming Wheels is a geared, lever-action, manual wheelchair system designed to mitigate these challenges. For the 2017-2018 school year, the goal of the project was to create a functional prototype by optimizing the previous year’s project. Specifically, the weight and noise output needed to be decreased, and the shifting, braking, and overall ergonomics of the chair needed to be improved. The total weight of the chair was ...


Removal Of Carbamazepine From Drinking Water, Adam Johnson, Thomas Krumpolc, Jordan Gadberry, Juan Rodriguez, Paolo Marrero-Rivera, Zachary Wiese Dec 2018

Removal Of Carbamazepine From Drinking Water, Adam Johnson, Thomas Krumpolc, Jordan Gadberry, Juan Rodriguez, Paolo Marrero-Rivera, Zachary Wiese

Chemical Engineering Undergraduate Honors Theses

Due to the increasing prevalence of prescription medication over the past few

decades, pharmaceuticals have accumulated in various water sources. This has become a

public health concern because many pharmaceuticals have limited research on the effects

of chronic low-level exposure. According to the World’s Health Organization (WHO),

traces of pharmaceuticals products have been reported in different water sources such as

surface waters, wastewater, groundwater, and drinking water.[1] One pharmaceutical of

interest that has been detected in water sources is carbamazepine. Carbamazepine is a

common pharmaceutical prescribed for the treatment of seizure disorders, neuropathic

pain, and various psychological disorders ...


Removal Of Carbamazepine From Drinking Water, Thomas Krumpolc, Juan Rodriguez, Jordan Alex Gadberry, Zach Wiese, Paola Marrero-Rivera, Adam Johnson Dec 2018

Removal Of Carbamazepine From Drinking Water, Thomas Krumpolc, Juan Rodriguez, Jordan Alex Gadberry, Zach Wiese, Paola Marrero-Rivera, Adam Johnson

Chemical Engineering Undergraduate Honors Theses

Due to the increasing prevalence of prescription medication over the past few decades, pharmaceuticals have accumulated in various water sources. This has become a public health concern because many pharmaceuticals have limited research on the effects of chronic low-level exposure. According to the World’s Health Organization (WHO), traces of pharmaceuticals products have been reported in different water sources such as surface waters, wastewater, groundwater, and drinking water.[1] One pharmaceutical of interest that has been detected in water sources is carbamazepine. Carbamazepine (CBZ) is a common pharmaceutical prescribed for the treatment of seizure disorders, neuropathic pain, and various psychological ...


Removal Of Carbamazepine From Drinking Water, Juan Rodriguez, Tom Krumpolc, Adam Johnson, Paola Marrero-Rivera, Alex Gadberry, Zach Wiese Dec 2018

Removal Of Carbamazepine From Drinking Water, Juan Rodriguez, Tom Krumpolc, Adam Johnson, Paola Marrero-Rivera, Alex Gadberry, Zach Wiese

Chemical Engineering Undergraduate Honors Theses

Due to the increasing prevalence of prescription medication over the past few decades, pharmaceuticals have accumulated in various water sources. This has become a public health concern because many pharmaceuticals have limited research on the effects of chronic low-levelexposure. According to the World’s Health Organization (WHO), traces of pharmaceuticalsproducts have been reported in different water sources such as surface waters, wastewater, groundwater, and drinking water.[1] One pharmaceutical of interest that has been detected in water sources is carbamazepine. Carbamazepine (CBZ) is a common pharmaceutical prescribedfor the treatment of seizure disorders, neuropathic pain, and various psychological disorders. It’s ...


Toko Jual Minyak Pembesar Penis Di Sintang 082114104140, Toko Raja Shop Sep 2018

Toko Jual Minyak Pembesar Penis Di Sintang 082114104140, Toko Raja Shop

toko raja shop | Agen Jual Obat Pembesar Kualitas No 1

Toko Jual Minyak Pembesar Penis Di Sintang, Jual Minyak Pembesar Penis Di Sintang, Pembesar Penis Di Sintang, Minyak Pembesar Penis Di Daerah Sintang, Pembesar Penis Di Wilayah Sintang, Alamat Jual Pembesar Penis Di Sintang, Harga Pembesar Penis Di Sintang, Agen Jual Pembesar Penis Di Sintang, Apotik Jual Minyak Pembesar Penis Di Sintang, Ciri Ciri Pembesar Penis Di Sintang, Distributor Agen Pembesar Penis Di Sintang, Efeksamping Pembesar Penis Di Sintang,


Format Pemesanan Minyak Black Asli Original.?????

  1. Cara Pemesanan.
Nama Lengkap :
Alamat Lengkap :
No. HP :
Barang Pesanan : Minyak Black Mamba Asli Original
Transfer Di Bank BRI :
Untuk Pemesanan Via Online Kalo Sudah ...


Design Of Wind Turbine Tower Height And Blade Length: An Optimization Approach, Ryan Wass Sep 2018

Design Of Wind Turbine Tower Height And Blade Length: An Optimization Approach, Ryan Wass

Mechanical Engineering Undergraduate Honors Theses

The wind industry is a fast growing market and is quickly becoming competitive with traditional non-renewable energy resources. As with any developing industry, research must continually be redefined as more complex understandings of design variables are learned. Optimization studies are common ways to quickly refine design variable selections. Historical wind turbine data shows that the tower hub height to rotor diameter ratio scales almost linearly. However there is no specific rule that dictates the optimum hub height for a given diameter. This study addresses this question by using an Excel based optimization program to determine the height to diameter ratio ...


Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman Sep 2018

Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman

Agricultural and Biosystems Engineering Publications

Woodchip bioreactors are recognized as an effective best management practice in the Iowa Nutrient Reduction Strategy. This edge-of-field practice intercepts and removes NO3-N, thereby reducing the NO3-N concentration in tile drainage before being discharged into surface water. Actual NO3-N load reductions realized by woodchip bioreactors are impacted by bioreactor size, hydraulic retention time (HRT), and denitrification efficiency. A typical woodchip bioreactor in Iowa may have 0.07% bioreactor area with respect to treatment area, 4–8 h HRT, and 43% mean denitrification efficiency. Here, we explored the potential of using electrically stimulated woodchip bioreactors to achieve greater NO3-N removal, and ...


The Effects Of Geometric And Stoichometric Change In Nanoparticles And Materials On Lattice Thermal Conductivity, W. Tanner Yorgason Aug 2018

The Effects Of Geometric And Stoichometric Change In Nanoparticles And Materials On Lattice Thermal Conductivity, W. Tanner Yorgason

All Graduate Theses and Dissertations

Thermal transport properties are critical for applications ranging from thermal management to energy conversion. Passive thermal management has been an area of study for over a century and has only grown as technology has advanced because it requires no additional energy to remove heat. Changing the nanostructure of the materials involved in passive heat transfer methods, either by geometric changes or stoichiometric changes, can greatly improve the effectiveness of this heat transfer method. In order to explore this further, this work employs LAMMPS molecular dynamics (MD) simulation software to calculate the lattice thermal conductivity (λp) of a nanoparticle (NP ...


Ultraviolet Diffraction Assisted Image Correlation (Uv-Daic) For Single-Camera 3d Strain Measurement At Extreme Temperatures, Ethan K. Nickerson Aug 2018

Ultraviolet Diffraction Assisted Image Correlation (Uv-Daic) For Single-Camera 3d Strain Measurement At Extreme Temperatures, Ethan K. Nickerson

All Graduate Theses and Dissertations

Digital Image Correlation (DIC) is a technique which uses images taken before and after deformation to determine displacement and strain data over the surface of the sample. In order to obtain this data for both in-plane as well as out-of-plane direction, multiple views of the sample are required. Typically, this is accomplished using multiple cameras, but it is possible to use diffraction gratings to bend the light coming from the specimen in order to allow a single camera to capture multiple views. This technique is referred to as Diffraction Assisted Image Correlation (DAIC) and has been previously demonstrated at room ...


Biomass And Phycocyanin From Oil And Natural Gas Extraction Produced Water Utilizing A Cyanobacteria Dominated Rotating Algal Biofilm Reactor (Rabr), Jonathan L. Wood Aug 2018

Biomass And Phycocyanin From Oil And Natural Gas Extraction Produced Water Utilizing A Cyanobacteria Dominated Rotating Algal Biofilm Reactor (Rabr), Jonathan L. Wood

All Graduate Theses and Dissertations

The production of cyanobacterial biofilm biomass and phycocyanin from Rotating Algal Biofilm Reactors utilizing undiluted produced water from oil and natural gas extraction as a culture medium was investigated in this study. Produced water is the largest waste stream generated by the oil and natural gas industries and represents a large volume of non-potable water that may be available for algae culture with minimal impact on freshwater resources. Combining the use of produced wastewater as culture medium with the production of high value algal pigments, such as phycocyanin, may increase the economic viability of algae culture and wastewater purification. High ...


Plume Contamination Measurements Of An Additively-Printed Gox/Abs Hybrid Thruster, David A. Brewer Aug 2018

Plume Contamination Measurements Of An Additively-Printed Gox/Abs Hybrid Thruster, David A. Brewer

All Graduate Theses and Dissertations

This thesis examines the impact of the physical contamination on optical surfaces of spacecraft by an ABS/GOX thruster. Plume contamination presents a significant operational hazard for spacecraft solar arrays and thermal control surfaces can lead to decreased power production and increased spacecraft temperatures. Historically, due to the lack of a reliable, on-demand, and multiple-use ignition methodology, hybrid rockets have never been previously considered for in-space propulsion. Recent advancements in hybrid rocket technologies, have made hybrid systems feasible for in space propulsion. However, prior to this study no research had ever been performed with regard to plume contamination effects due ...


On Thermal Bowing Of Concrete Sandwich Wall Panels With Flexible Shear Connectors, Fray Pozo Aug 2018

On Thermal Bowing Of Concrete Sandwich Wall Panels With Flexible Shear Connectors, Fray Pozo

All Graduate Theses and Dissertations

Thermal bowing, often referred as bulging or out-of-plane wall deflection, is a common issue on sandwich panel walls caused by a temperature differential between a building interior temperature and the environment. The stresses caused by temperature changes in concrete members are widely known in the practice of bridge design, but not on sandwich wall panels. For sandwich wall panel applications, it is common to have non-composite panels when the designer expects a high temperature gradient, what yields a less economical design, but reduces the bowing.

This project aimed to validate current assumptions regarding the heat flow in sandwich wall panels ...


A Non-Equilibrium Molecular Dynamics Study Of The Effects Of Helium Bubbles On The Thermal Conductivity Of Zrc, Tate Shorthill Aug 2018

A Non-Equilibrium Molecular Dynamics Study Of The Effects Of Helium Bubbles On The Thermal Conductivity Of Zrc, Tate Shorthill

All Graduate Plan B and other Reports

Zirconium carbide (ZrC) has been proposed as a potential improvement to nuclear fuel cladding. As such, it is important to characterize its physical properties, particularly those relating to thermal energy transport. Reactor conditions are known to damage fuel microstructure over time. While research has been conducted on undamaged and damaged ZrC, some areas of interest remain. Fission products, such as helium, can accumulate in pores within the fuel microstructure. Such a case has yet to be characterized in ZrC fuel cladding.

A non-equilibrium molecular dynamics model was developed to characterize the thermal properties of ZrC. Fourier’s Law allows the ...


Effectiveness Of Ethical Interventions In A First-Year Engineering Course: A Pilot Study, Richard T. Cimino, Scott C. Streiner Jul 2018

Effectiveness Of Ethical Interventions In A First-Year Engineering Course: A Pilot Study, Richard T. Cimino, Scott C. Streiner

Richard Cimino

No abstract provided.


Input Space Dependent Controller For Civil Structures Exposed To Multi-Hazard Excitations, Liang Cao, Simon Laflamme, Jonathan Hong, Jacob Dodson Jul 2018

Input Space Dependent Controller For Civil Structures Exposed To Multi-Hazard Excitations, Liang Cao, Simon Laflamme, Jonathan Hong, Jacob Dodson

Civil, Construction and Environmental Engineering Publications

A challenge in the control of civil structures exposed to multiple types of hazards is in the tuning of control parameters to ensure a prescribed level of performance under substantially different excitation dynamics, which could be considered as largely uncertain. A solution is to leverage data driven control algorithms, which, in their adaptive formulation, can self-tune to uncertain environments. The authors have recently proposed a new type of data-driven controller, termed input space dependent controller (ISDC), that has the particularity to adapt its input space in real-time to identify key measurements that represent the essential dynamics of the system. Previous ...


Systems Engineering Analysis For Optimum Selection Protocol For Thermal Expansion Measurement Of A Carbon Fiber Reinforced Composite Tube, Ronald Uchimiya Jul 2018

Systems Engineering Analysis For Optimum Selection Protocol For Thermal Expansion Measurement Of A Carbon Fiber Reinforced Composite Tube, Ronald Uchimiya

LMU/LLS Theses and Dissertations

A material’s Coefficient of Thermal Expansion (CTE) is a valuable physical property, particularly for structural fiber reinforced composites that are routinely used in satellite/aerospace applications. Satellite space structures are routinely designed with a high degree of dimensional and thermal stability. Designing and verifying for near zero CTE performance is a common design requirement. The CTE is routinely a physical property with known values for common materials. However, the strength, stiffness and CTE properties on a multi-ply graphite fiber reinforced laminate composite can be tailored to specific engineering requirements. Because of this, a method of verification (testing) is routinely ...


A Parametric Electrostatic Resonator Using Repulsive Force, Shahrzad Towfighian, Mark Pallay Jul 2018

A Parametric Electrostatic Resonator Using Repulsive Force, Shahrzad Towfighian, Mark Pallay

Mechanical Engineering Faculty Scholarship

In this paper, parametric excitation of a repulsive force electrostatic resonator is studied. A theoretical model is developed and validated by experimental data. A correspondence of the model to Mathieu's Equation is made to prove the existence and location of parametric resonance. The repulsive force creates a combined response that shows parametric and subharmonic resonance when driven at twice its natural frequency. The resonator can achieve large amplitudes of almost 24 μm and can remain dynamically stable while tapping on the electrode. Because the pull-in instability is eliminated, the beam bounces off after impact instead of sticking to the ...


Integrated Scheduling And Control In Discrete-Time With Dynamic Parameters And Constraints, Logan Beal, Damon Petersen, David R. Grimsman, Sean Warnick, John Hedengren Jul 2018

Integrated Scheduling And Control In Discrete-Time With Dynamic Parameters And Constraints, Logan Beal, Damon Petersen, David R. Grimsman, Sean Warnick, John Hedengren

All Faculty Publications

Integrated scheduling and control (SC) seeks to unify the objectives of the various layers of optimization in manufacturing. This work investigates combining scheduling and control using a nonlinear discrete-time formulation, utilizing the full nonlinear process model throughout the entire horizon. This discrete-time form lends itself to optimization with time-dependent constraints and costs. An approach to combined SC is presented, along with sample pseudo-binary variable functions to ease the computational burden of this approach. An initialization strategy using feedback linearization, nonlinear model predictive control, and continuous-time scheduling optimization is presented. The formulation is applied with a generic continuous stirred tank reactor ...


Book Review: Fundamentals Of International Aviation, Alan Bender Jun 2018

Book Review: Fundamentals Of International Aviation, Alan Bender

International Journal of Aviation, Aeronautics, and Aerospace

Not applicable.


Iceland’S Renewable Energy Sources & Climate Change, Daniel Roberts, Michael Conway Jun 2018

Iceland’S Renewable Energy Sources & Climate Change, Daniel Roberts, Michael Conway

Student Works

Nearly all of Iceland’s energy comes from renewable resources, with the majority being hydroelectric energy, and the remainder being geothermal. For several months undergraduate student researchers from Embry-Riddle Aeronautical University, aided by faculty from the Office of Undergraduate Research, conducted secondary-source research on the effect climate change has on Iceland’s renewable resources currently, and progressing throughout the century. Additionally, research was conducted on how the Icelandic Government plans on responding to these eminent changes. Earth's rising temperatures are causing a shrinkage of Iceland’s glaciers, and changing the water runoff from their glaciers at an alarming rate ...


Feeding The World With Die Rolls: Potential Applications Of Quantum Computing Jun 2018

Feeding The World With Die Rolls: Potential Applications Of Quantum Computing

Dartmouth Undergraduate Journal of Science

No abstract provided.


The Mouhefanggai And Cavalieri's Principle Jun 2018

The Mouhefanggai And Cavalieri's Principle

Dartmouth Undergraduate Journal of Science

No abstract provided.


Ethical Regulation Of Medical Experiments On Humans, Nick Awertschenko Jun 2018

Ethical Regulation Of Medical Experiments On Humans, Nick Awertschenko

Dartmouth Undergraduate Journal of Science

No abstract provided.


The Science Behind Memory: Hippocampal Neural Cell Assemblies, Nishi Jain Jun 2018

The Science Behind Memory: Hippocampal Neural Cell Assemblies, Nishi Jain

Dartmouth Undergraduate Journal of Science

No abstract provided.


The Immunity Of The Many: Ethical Considerations Of Vaccinations In Light Of Herd Immunity, Sophia Koval Jun 2018

The Immunity Of The Many: Ethical Considerations Of Vaccinations In Light Of Herd Immunity, Sophia Koval

Dartmouth Undergraduate Journal of Science

No abstract provided.