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Articles 39151 - 39180 of 196046

Full-Text Articles in Engineering

Creating A Demolition Topic Course, Eli Jeremiah Lipton Mar 2022

Creating A Demolition Topic Course, Eli Jeremiah Lipton

Construction Management

Demolition is as old as construction itself and has always played an integral role in the construction process. That is, however, not the reality of the Construction Management (CM) program at California Polytechnic State University (Cal Poly). The current curriculum covers a wide range of topics and prepares students to be able to join any residential, commercial, and heavy civil projects. These projects all have something in common, the demolition process. Undergraduates are not prepared with the basic demolition knowledge to be successful in the industry. Demolition is overlooked at Cal Poly and is not a primary focus in any …

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The Development And Evaluation Of A New Trench Safety Equipment, Joshua D. Clesi Mar 2022

The Development And Evaluation Of A New Trench Safety Equipment, Joshua D. Clesi

Construction Management

One of the most dangerous works in construction is trench work and excavation. Fatalities that range from permanent injuries to death happen to construction workers every day, not having a lot of alternatives to prevent unfortunate incidents such as cave-ins and shoring failures. What this paper is proposing is a new invention that may solve this ongoing problem with trench safety. The idea is a crane-like lift attached to the back of a pick-up truck that will vertically lift people out of the trenches in a matter of seconds before shoring collapses or the trench caves in. This project primarily …

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The Integration Of Virtual Reality In The Commercial Construction Industry, Justin T. Gin Mar 2022

The Integration Of Virtual Reality In The Commercial Construction Industry, Justin T. Gin

Construction Management

Virtual reality has recently been spreading throughout the commercial construction industry rapidly. Some of its capabilities are safety training, helping spot Americans with Disabilities Act (ADA) issues, logistics planning, and virtual walkthroughs. Many construction companies were starting to utilize virtual reality's advantages until COVID-19 hit. The initial wave of COVID slowed down construction in general as well as the need or use of virtual reality. Now, some companies are worried about the health risks and implementation issues that virtual reality headsets might bring while other companies are optimistic about the future of virtual reality. This report will explore the different …

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Using Project Production Methodology To Compare Onsite Prefabrication Steel Erection To Traditional Stick-Built, Corinne R. Nalder Mar 2022

Using Project Production Methodology To Compare Onsite Prefabrication Steel Erection To Traditional Stick-Built, Corinne R. Nalder

Construction Management

Project production management provides continuity, predictability, and optimization of a process in comparison to the traditional approach of project management. Prefabrication is an example of project production management in which there is continuity of the product, reduced variability, and where the assembly process can be altered for best results. This paper will examine the benefits of project production management and compare two methods of steel erection in which one method performs an onsite prefabrication process while the other method employs the traditional stick-built process. The two methods will be modeled by a tool that replicates a repetitive process similar to …

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Analysis Of The Potential Structure Of A Peer Mentorship Program For The Construction Management Department At Cal Poly, Slo, Jane C. Runte Mar 2022

Analysis Of The Potential Structure Of A Peer Mentorship Program For The Construction Management Department At Cal Poly, Slo, Jane C. Runte

Construction Management

The Construction Management Department at Cal Poly, SLO has no structured peer mentorship program as of 2022. The department has attempted to implement a peer mentoring program in the past but none with longevity. This paper analyzes data collected from the students of the CM Department through a qualitative and quantitative survey regarding the need and structure of a peer mentorship program to begin again. The survey’s main goal was to gain an understanding of whether or not the students think the department should implement a peer mentorship program and the structure that the student body would find most beneficial …

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Sustainability Within Asphalt And Concrete Paving Systems, Matthew Clapp Mar 2022

Sustainability Within Asphalt And Concrete Paving Systems, Matthew Clapp

Construction Management

The construction industry is continually determining ways to make the building process more streamlined, cost efficient and, more recently, sustainable. As the commercial construction industry becomes more structured, industry leaders are looking for new ways to make installation of materials and cleanup more environmentally friendly. Construction is responsible for a large portion of the overall harm toward the environment. Although the commercial sector has made great strides toward this effort in the last fifty years with programs such as LEED, there is still much to be taken into consideration. The goal of this research is to analyze the current trends …

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Gnss Construction Surveying, Jake C. Carter Mar 2022

Gnss Construction Surveying, Jake C. Carter

Construction Management

This Senior Project examines world of cutting-edge surveying technology which will be implemented into Cal Poly’s Construction Management 239 Construction Surveying course. It creates a field exercise for student learning that mimics the application the of Global Navigation Satellite Systems (GNSS) and how they are used in the construction industry. The new exercise includes the use of GNSS receivers, base hubs, field computers, and a Topcon MAGNET Field application. From the research phase to the training/learning phase to the implementation of the assignment into the course this project embodied the “Learn-By-Doing” philosophy. This project was successful in demonstrating how GNSS …

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Introduction To A Demolition Topics Course, Scott Martin Mar 2022

Introduction To A Demolition Topics Course, Scott Martin

Construction Management

The California Polytechnic State University (Cal Poly) Construction Management (CM) program was created to allow graduates the opportunity to work effectively in practically every part of the construction industry. The curriculum covers a wide range of topics and prepares students with the ability to join various projects, such as residential, commercial, and heavy civil projects. What these projects all have in common, a topic almost entirely ignored at Cal Poly but nonetheless very important and relevant, is demolition in the construction industry. By offering a course focused entirely on the demolition process, principles, and safety, students will be better prepared …

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Proposal For Adobe Earthbag Disaster-Relief Structure, John Camacho Mar 2022

Proposal For Adobe Earthbag Disaster-Relief Structure, John Camacho

Construction Management

The science behind creating an adobe house has been around for thousands of years; the primitive mixture contains only dirt, water, and straw. Left to cure in bricks or as a single cast-in-place system, the structure will provide long-lasting protection from the elements. Science has taken this a step further with the introduction of cementitious admixtures and reinforcement. The result is an adobe structure with exemplary thermo-retentive properties and load-bearing capabilities. This project provides an analysis on the “SuperAdobe” earthbag system that has been put into practice by independent contractors and housing-relief initiatives. The goal of the project was to …

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Impact Of Covid-19 On Sense Of Community / Student Engagement, Aaron Sauer, Richard Gebken, Richard Bruce Mar 2022

Impact Of Covid-19 On Sense Of Community / Student Engagement, Aaron Sauer, Richard Gebken, Richard Bruce

The Professional Constructor

The spring of 2020 was a time of unprecedented change for higher education institutions. The COVID-19 pandemic forced schools to re-think instructional delivery and the undergraduate experience as they implemented measures to protect students, faculty, and staff. Unraveling the impact of the pandemic on higher education will take many years. This study investigated how the institutional response in the return to campus following the pandemic influenced sense of community, a component of student engagement. A previously developed instrument was delivered at two construction management programs in the U.S. Midwest before and after the pandemic. The two schools were similar in …

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Perceptions Of Remote Work Within The Construction Industry Resulting From The Covid-19 Pandemic In The South Central United States, Sara B. Overturf, Ben Bigelow, Matthew Reyes Mar 2022

Perceptions Of Remote Work Within The Construction Industry Resulting From The Covid-19 Pandemic In The South Central United States, Sara B. Overturf, Ben Bigelow, Matthew Reyes

The Professional Constructor

Working remotely became increasingly popular over the previous two years, given organization’s need to rapidly adjust to changing conditions as a result of the Coronavirus. It allowed companies to more easily adapt to stay-at home orders and create a safer environment for their employees. While working remotely can have a positive impact on employees, there are also challenges to overcome for both employees and organizations. This study focused on understanding both the prevalence and implementation of remote work within the commercial Construction industry to face the professional challenges resulting from the Coronavirus. This paper provides insight into companies that have …

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Educating The Construction Client: Training Strategy For Buyers Of Commercial Design And Construction Services, Michael J. Emmer Mar 2022

Educating The Construction Client: Training Strategy For Buyers Of Commercial Design And Construction Services, Michael J. Emmer

The Professional Constructor

Business owners can face a myriad of challenges when venturing into a new construction project. Most of the design and construction process is unfamiliar territory as compared to their customary business operations and owners face a wide assortment of issues when making the decision to build a new facility. Consequently, the majority of owners are entirely out of their business element when deciding to enter into the undertaking of a new building project. Since most of the risk with any given project rests with the Owner, better training and strategies for owners will lead to a higher likelihood of project …

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Current State Of The Workforce Demographics And Knowledge Transfer Strategies In The Southeast United States, Vivek Sharma, Dhaval Gajjar, Kapil Madathil, David Davis, Shreyas Patel Mar 2022

Current State Of The Workforce Demographics And Knowledge Transfer Strategies In The Southeast United States, Vivek Sharma, Dhaval Gajjar, Kapil Madathil, David Davis, Shreyas Patel

The Professional Constructor

The construction industry is a very diverse industry due to the unique nature of projects and expertise within various construction companies driven by multiple regional/national factors. The United States Department of Labor reported 44% of the current US employed population will be above 65 in eleven years by 2028, making workforce studies and knowledge transfer a key driver in leading construction business models. This study conducted an in-depth investigation in the southeast region of the US on the current state of workforce demographics and the need for knowledge transfer within the ranks of management coupled with trade personnel. The study …

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Using Flight Simulation As A Convenient Method For Uas Flight Assessment For Contractors, Colin Dees, Joseph M. Burgett Mar 2022

Using Flight Simulation As A Convenient Method For Uas Flight Assessment For Contractors, Colin Dees, Joseph M. Burgett

The Professional Constructor

Operating an unmanned aircraft system (UAS) for commercial purposes in the United States requires the pilot to pass the Federal Aviation Administration’s (FAA’s) knowledge exam to earn their UAS license. The exam does not include a practical component where flight proficiency is assessed. This represents a source of risk for contractors if flight proficiency is not evaluated in another way. The National Institute of Standards and Technology is a federal agency and has developed the Basic Maneuvering Test (BMT). It is the only nationally recognized UAS flight proficiency exam. While not required, the construction industry can benefit by using this …

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The Preconstruction Of Sustainable Housing In Muhanga, Rwanda, Rachael Worstman Mar 2022

The Preconstruction Of Sustainable Housing In Muhanga, Rwanda, Rachael Worstman

Construction Management

This project involved the designing and building process of a sustainable, environmentally sound housing option designed for the people of Muhanga, Rwanda. This project was initially inspired by the Earthships built in New Mexico. During the design process the Earthships' design and materials used was evaluated, then altered to better suit Rwanda based on the available natural resources and needs of the people. Rwandans have endured a traumatic history and still experiences struggle today. An example of this is the anti-thatching campaign in 2011 that left thousands of people homeless as they were forced out of their unsafe homes. One …

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Construction Management Students Using Technology In The Field, Anthony D. Bongi Mar 2022

Construction Management Students Using Technology In The Field, Anthony D. Bongi

Construction Management

This research paper examines the affect technology has had on the desire for college graduates to pursue a career in the field. The idea of college graduates entering directly into a field leadership position was contemplated and discussed. Historically, soft skills such as leadership and communication have been the predominate attributes of any worker expected to run construction in the field. While the importance of these skills hasn’t changed, the importance of technological skills has increased to be considered alongside soft skills. Through an anonymous survey of industry professionals with 10+ years of experience as well as interviews of two …

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Sustainable Building Techniques In Levi’S Stadium: A Case Study, Sean Zweigle Mar 2022

Sustainable Building Techniques In Levi’S Stadium: A Case Study, Sean Zweigle

Construction Management

This study aimed to analyze the sustainability of Levi’s Stadium in Santa Clara, California through an analysis of its Leadership in Energy and Environmental Design or LEED certification. Levi’s Stadium was the first professional sports stadium to receive LEED Gold certification in 2014, at a time where a focus on green building practices was becoming an industry standard. This analysis aims to determine what avenues the project team employed to ensure certification, including various standout features and strategies. Additionally, the study investigates the scorecard used to award points towards LEED certification, highlighting categories emphasized in design and construction and those …

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Vapor-Selective Active Membrane Energy Exchanger With Mechanical Ventilation And Indoor Air Recirculation, Andrew J. Fix, Bryan C. Pamintuan, James Braun, David M. Warsinger Mar 2022

Vapor-Selective Active Membrane Energy Exchanger With Mechanical Ventilation And Indoor Air Recirculation, Andrew J. Fix, Bryan C. Pamintuan, James Braun, David M. Warsinger

School of Mechanical Engineering Faculty Publications

It is widely known that increasing outdoor air ventilation rates in buildings can help improve indoor air quality and mitigate the spread of diseases. However, cooling and dehumidifying outdoor air requires significantly more energy than treating indoor recirculated air. Recent developments in water vapor-selective membranes, which use a vapor partial pressure gradient to remove water vapor from air, offer a unique opportunity to provide highly efficient dehumidification in HVAC systems that can justify high outdoor air ventilation rates without drastic increases in energy consumption. This work presents an analysis of a novel membrane HVAC system referred to as the Active …

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Carrier Injection To In0.4Ga0.6As/Gaas Surface Quantum Dots In Coupled Hybrid Nanostructures, Jingtao Liu, Shiping Luo, Xiao Liu, Ying Wang, Chunsheng Wang, Shufang Wang, Guangsheng Fu, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo, Baolai Liang Mar 2022

Carrier Injection To In0.4Ga0.6As/Gaas Surface Quantum Dots In Coupled Hybrid Nanostructures, Jingtao Liu, Shiping Luo, Xiao Liu, Ying Wang, Chunsheng Wang, Shufang Wang, Guangsheng Fu, Yuriy I. Mazur, Morgan E. Ware, Gregory J. Salamo, Baolai Liang

Electrical Engineering Faculty Publications and Presentations

Stacking growth of the InGaAs quantum dots (QDs) on top of a carrier injection layer is a very useful strategy to develop QD devices. This research aims to study the carrier injection effect in hybrid structures with a layer of In0.4Ga0.6As surface quantum dots (SQDs), coupled to an injection layer of either one layer of In0.4Ga0.6As buried QDs (BQDs) or an In0.15Ga0.85As quantum well (QW), both through a 10 nm GaAs thin spacer. Spectroscopic measurements show that carrier capture and emission efficiency for SQDs in the BQD injection structure is better than …

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An Exploratory Study Of General Aviation Aircraft Magneto Ignition System Failures, Gregory Alexander Damien Fox Mar 2022

An Exploratory Study Of General Aviation Aircraft Magneto Ignition System Failures, Gregory Alexander Damien Fox

Theses and Dissertations

This ex-post-facto, archival, single-case, research study explored early failures of magneto ignition systems in the training aircraft fleet operated by FIT Aviation, LLC (FITA). In 2012, an increasing number of early magneto failures prompted FITA to outsource the overhaul work to a specialty overhaul provider. Despite contracting out the overhauls, the early magneto failures continued to increase. Archival data, from the beginning of 2007 through the first quarter of 2017, came from engines logbooks associated with 48 Piper aircraft. Archival data were grouped into four categorical variables by aircraft type. A total of 518 magnetos, separately mounted as left or …

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Biogeosciences Perspectives On Integrated, Coordinated, Open, Networked (Icon) Science, D. Dwivedi, A. L.D. Santos, M. A. Barnard, T. M. Crimmins, A. Malhotra, K. A. Rod, K. S. Aho, S. M. Bell, B. Bomfim, F. Q. Brearley, H. Cadillo-Quiroz, J. Chen, C. M. Gough, E. B. Graham, C. R. Hakkenberg, L. Haygood, G. Koren, E. A. Lilleskov, L. K. Meredith, S. Naeher, Z. L. Nickerson, O. Pourret, H. S. Song, M. Stahl, N. Taş, R. Vargas, S. Weintraub-Leff Mar 2022

Biogeosciences Perspectives On Integrated, Coordinated, Open, Networked (Icon) Science, D. Dwivedi, A. L.D. Santos, M. A. Barnard, T. M. Crimmins, A. Malhotra, K. A. Rod, K. S. Aho, S. M. Bell, B. Bomfim, F. Q. Brearley, H. Cadillo-Quiroz, J. Chen, C. M. Gough, E. B. Graham, C. R. Hakkenberg, L. Haygood, G. Koren, E. A. Lilleskov, L. K. Meredith, S. Naeher, Z. L. Nickerson, O. Pourret, H. S. Song, M. Stahl, N. Taş, R. Vargas, S. Weintraub-Leff

Department of Agricultural and Biological Systems Engineering: Faculty Publications

This article is composed of three independent commentaries about the state of Integrated, Coordinated, Open, Networked (ICON) principles in the American Geophysical Union Biogeosciences section, and discussion on the opportunities and challenges of adopting them. Each commentary focuses on a different topic: (a) Global collaboration, technology transfer, and application (Section 2), (b) Community engagement, community science, education, and stakeholder involvement (Section 3), and (c) Field, experimental, remote sensing, and real-time data research and application (Section 4). We discuss needs and strategies for implementing ICON and outline short- and long-term goals. The inclusion of global data and international community engagement are …

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Kinetic And Thermodynamic Analyses For Pyrolysis Of Hemp Hurds Using Discrete Distributed Activation Energy Model, Panuphong Mankeed, Thossaporn Onsree, Salman Raza Naqvi, Sirivatch Shimpalee, Nakorn Tippayawong Mar 2022

Kinetic And Thermodynamic Analyses For Pyrolysis Of Hemp Hurds Using Discrete Distributed Activation Energy Model, Panuphong Mankeed, Thossaporn Onsree, Salman Raza Naqvi, Sirivatch Shimpalee, Nakorn Tippayawong

Faculty Publications

In many counties, hemp is becoming a high-valued economic crop. Post-processing, more than 65% w/w of its starting material becomes waste. Herein, pyrolysis of hemp hurds/residues was investigated under low (10-50 degrees C/min) and intermediate (100-150 degrees C/min) heating rates using a discrete distributed activation energy model (DAEM). Thermochemical decomposition of hemp hurds occurred in three stages: drying, active pyrolysis, and char formation, accounting for 70-80% w/w overall weight loss. With the discrete DAEM, the model can be utilized for predicting pyrolysis behaviors of hemp hurds accurately with correlation coefficient of over 0.99. Different reaction mechanisms appeared between the low …

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Pedagogical Approaches For Facilitating Engineering Leadership Development, Teresa J. Didiano, Annie E. Simpson, David J. Bayless Mar 2022

Pedagogical Approaches For Facilitating Engineering Leadership Development, Teresa J. Didiano, Annie E. Simpson, David J. Bayless

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This article describes transformative, impactful pedagogical practices that engage students in the process of leadership development. We share practical examples of instructional strategies and facilitation techniques from curricular and co-curricular initiatives.

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Analysis Of Container Shipments For Ustranscom, John N. Campos Y Campos Mar 2022

Analysis Of Container Shipments For Ustranscom, John N. Campos Y Campos

Theses and Dissertations

USTRANSCOM (United States Transportation Command) sends containers to various overseas destinations, mainly commercial container shipping companies. Delivering the containers to the destinations on time is important to support the United States (US) Forces deployed in foreign countries. This study analyzes container shipment records for two years from 2019 to 2021 and prepares insights for USTRANSCOM. This study utilizes descriptive statistics, data visualization, and one-way analysis of variance (ANOVA). According to the records, almost half of the containers (41.25%) were delivered late for one day or longer. The container with the longest delay took 408 days. Major reasons for delays included …

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Real Time Evaluation Of Boom And Drogue Occlusion With Aar, Xiaoyang Wu Mar 2022

Real Time Evaluation Of Boom And Drogue Occlusion With Aar, Xiaoyang Wu

Theses and Dissertations

In recent years, Unmanned Aerial Vehicles (UAV) have seen a rise in popularity. Various navigational algorithms have been developed as a solution to estimate a UAV’s pose relative to the refueler aircraft. The result can be used to safely automate aerial refueling (AAR) to improve UAVs’ time-on-station and ensure the success of military operations. This research aims to reach real-time performance using a GPU accelerated approach. It also conducts various experiments to quantify the effects of refueling boom/drogue occlusion and image exposure on the pose estimation pipeline in a lab setting.

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Simulating Autonomous Cruise Missile Swarm Behaviors In An Anti-Access Area Denial (A2ad) Environment, Kyle W. Goggins Mar 2022

Simulating Autonomous Cruise Missile Swarm Behaviors In An Anti-Access Area Denial (A2ad) Environment, Kyle W. Goggins

Theses and Dissertations

The increasingly sophisticated anti-access area denial (A2AD) threat imposed by the modern integrated air defense system (IADS), coupled with the decreasingly potent advantage provided by high-end stealth platforms, has prompted Air Force senior leaders to invest in radically changing the nature of air power for the year 2030 and beyond. A prominent element of this new vision is weapon swarming, which aims to address this challenge by overwhelming the IADS with huge numbers of low-cost, attritable aerial assets emboldened by autonomous capabilities. This research proposes a framework for classifying the different levels of autonomous capability along three independent dimensions—namely ability …

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Screening Heuristics For The Evaluation Of Covert Network Node Insertion Scenarios, Andrew E. Pekarek Mar 2022

Screening Heuristics For The Evaluation Of Covert Network Node Insertion Scenarios, Andrew E. Pekarek

Theses and Dissertations

The majority of research on covert networks uses social network analysis (SNA) to determine critical members of the network to either kill or capture for the purpose of network destabilization. This thesis takes the opposite approach and evaluates potential scenarios for inserting an agent into a covert network for information gathering purposes or future disruption operations. Due to the substantial number of potential insertion scenarios in a large network, this research proposes three screening heuristics that leverage SNA measures to reduce the solution space before applying a simple search heuristic.

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Feasibility Of Fireball Trail Detection Using Ground-Based Gps Receivers, Ian R. Moffett Mar 2022

Feasibility Of Fireball Trail Detection Using Ground-Based Gps Receivers, Ian R. Moffett

Theses and Dissertations

The feasibility of using GPS data to detect fireballs is analyzed by first modeling the fireball’s trail diffusion and plasma chemistry to get a resulting ion density profile of the trail over time. The signal perturbation caused by the fireball trail is simulated for a ground receiver using an analytic solution for diffraction from a Gaussian lens. Five cases were modeled with varying initial peak ion densities and altitudes taken from fireball and reentry vehicle data. This paper shows that it is feasible to detect a fireball trail using GPS if the fireball has a sufficiently high initial ion density, …

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Air Force Specialty Code Assignment Optimization, Rebecca L. Reynolds Mar 2022

Air Force Specialty Code Assignment Optimization, Rebecca L. Reynolds

Theses and Dissertations

Each year, the Air Force Personnel Center determines which career field newly commissioned officers will serve under during their time in the Air Force. The career fields are assigned while considering five priorities, dictated by Headquarters Air Force, Manpower and Personnel: target number of cadets, education requirements, average cadet percentile, cadet source of commissioning, and cadet preference. A mixed-integer linear program with elasticized constraints is developed to generate cadet assignments according to these priorities. Each elasticized constraint carries an associated reward and penalty, which is used to dictate the importance of the constraint within the model. A subsequent analysis is …

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Applied Agile Digital Mission Engineering For Cislunar Space Domain Awareness, Benjamin R. Williams Mar 2022

Applied Agile Digital Mission Engineering For Cislunar Space Domain Awareness, Benjamin R. Williams

Theses and Dissertations

In the backdrop of an expansion into cislunar space and a digital transformation, the author synthesizes a methodology from agile system development, DE, ME, and MBSE processes, methods, and tools to develop a basic RA and DT for cislunar SDA mission and system design. The Agile DME methodology is used to conduct basic requirements analysis, develop a concept, understand cislunar physics, study scenario geometries, and perform analyses and the DT implements, executes, and accelerates research by integrating a descriptive tool with analytical and simulation tools. This research demonstrates the value of automated Modeling, Simulation, and Analysis (MSA) work flows and …

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