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Articles 48901 - 48930 of 196864

Full-Text Articles in Engineering

Cost Functions Of Crabs: Applications Of Hermit Crab Shell Exchange Behavior To Vacancy Chain Modelling, Hannah Miele Apr 2021

Cost Functions Of Crabs: Applications Of Hermit Crab Shell Exchange Behavior To Vacancy Chain Modelling, Hannah Miele

Senior Honors Theses

Vacancy chain systems function as a method of resource distribution in domains such as housing and labor markets. Hermit crabs also employ vacancy chains as a method of shell exchange. Application of vacancy chain modelling in engineering has been attempted, but numerous flaws exist in the developed vacancy chain scheduling algorithm. This work addresses the lack of an appropriate vacancy chain cost function by developing a generalizable cost function based on hermit crab shell exchange behavior. The cost function’s purpose is enabling development of realistic engineering experiments and models based on real-world vacancy chain systems.

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The Impact Of Uas On The Passenger Airline Industry, Matthew Whitten Apr 2021

The Impact Of Uas On The Passenger Airline Industry, Matthew Whitten

Senior Honors Theses

This study seeks to cover the state of modern autonomous unmanned aerial systems (UAS) integration into commercial aviation, the future applications of the technology in the airline industry, and the roadblocks currently hindering its integration into passenger operations. Although great advancements are being made in the field, technological developments, economic impact, legal restrictions, airline cost, and public perception stand in the way of the full adaptation of autonomous technology into everyday passenger operations. However, technology is rapidly developing, perhaps allowing for the possibility of autonomous air travel even today, but there are likely years of refinement before regulators, executives, and …

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Improving The Intellectual And Social Development Of Children With Autism: Design Of A Training Center For Autism, Hasti Jalalian Apr 2021

Improving The Intellectual And Social Development Of Children With Autism: Design Of A Training Center For Autism, Hasti Jalalian

Makara Journal of Technology

Research on the relationship between the role of architecture and the psychology of children with autism, which indicates that appropriate environments for these children can have a significant effect on their healthcare process, has been recently conducted. However, statistics show that autism spectrum disorders are pervasive, and its extent in Iran has been increasing. Moreover, centers that are specifically designed for children with autism are limited, and paradigms are made without considering the mood of these children. Given the role of architecture in designing a suitable space for these children, an investigation that can identify the specific requirements of these …

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Numerical Study Of A Buckling Restrained Brace (Brb) In Steel Structures And Comparison With A Convergent Ordinary Brace (Ocb) Under Static And Dynamic Loading, Fatemeh Habibpour Apr 2021

Numerical Study Of A Buckling Restrained Brace (Brb) In Steel Structures And Comparison With A Convergent Ordinary Brace (Ocb) Under Static And Dynamic Loading, Fatemeh Habibpour

Makara Journal of Technology

Bulk metallic glass (BMG) has good mechanical strength, high hardness, wear resistance, and corrosion resistance with promising application in various industries. However, for the industrial production of BMG, the main issue is how to overcome limitations of joining with other materials. The present study focuses on solder processing at low operating temperature to avoid exceeding the recrystallization temperature. A feasible joining process for BMG was developed using lead-free solders. The BMG surface is pre-plated with copper, nickel, or titanium as a wetting layer. The reaction temperature is set between the glass transition temperature of BMG and the melting point of …

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Spike Nozzle Design For Use In Nanosat Orbital Maneuvering, Drew Nemeth Apr 2021

Spike Nozzle Design For Use In Nanosat Orbital Maneuvering, Drew Nemeth

Undergraduate Research Symposium Podium Presentations

Annular spike nozzle engines have long been the holy grail of rocket engine design, promising superior performance in a smaller footprint when compared to conventional bell nozzles. However, flaws inherent to the design of spike nozzles have prevented widespread adoption and testing. As a result, research on potential applications has been quite sparse. This project aims to further spike nozzle research by investigating rarely tested materials that literature suggests have potential for use in a spike nozzle design. The goal of the overall research project is to examine 3D printed polycarbonate component longevity under conditions representative of a small satellite …

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A Study On Modified Biochars For The Removal Of Trichloroethylene (Tce), Ashtin Hofert, Christina Obra, Suraj Venkat, Padmanabhan Krishnaswamy, Erica Marti Ph.D. Apr 2021

A Study On Modified Biochars For The Removal Of Trichloroethylene (Tce), Ashtin Hofert, Christina Obra, Suraj Venkat, Padmanabhan Krishnaswamy, Erica Marti Ph.D.

Undergraduate Research Symposium Posters

Biochar (BC), a biomass-derived black carbon with interconnected networks of micropores, is an economical substitute for conventional adsorbents, such as activated carbon. In this study, we investigated the effect of acid modification on the functional groups and adsorptive capacity of the biochar. The BC used here is prepared through pyrolysis at temperatures in the range between 700 °C and 900 °C in an argon gas inert environment from three different biomasses: walnut shells, pecan shells, and loblolly pine. Then, the BCs are modified using hydrochloric acid (HCl) and used for the remediation of chlorinated hydrocarbons such as trichloroethylene (TCE). The …

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Collective Risk Of Construction Development On Desert Tortoise Populations, Paulina Smith Apr 2021

Collective Risk Of Construction Development On Desert Tortoise Populations, Paulina Smith

Undergraduate Research Symposium Posters

Desert tortoises (Gopherus agassizii) are threatened, extremely territorial reptiles living on a rapidly-shrinking landscape. This literature review was conducted with the goal of determining whether the desert tortoises of the Mojave Desert are experiencing compounded effects from construction development which are not reflected in mortality/fecundity calculations in the current literature. Seventeen peer-reviewed sources were identified from the last 20 years which related to roads, railroads, wind-harvesting, solar energy, and man-made barriers/flood control centers in the Mojave. Current literature reveals that researchers do not have the time nor resources to pursue long-term studies on all of the possible effects on this …

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Toward The Use Of Drones For Photovoltaic Panel Inspection, Fausto Vega Apr 2021

Toward The Use Of Drones For Photovoltaic Panel Inspection, Fausto Vega

Undergraduate Research Symposium Posters

The monitoring of photovoltaic panels is an essential task to maintain the efficiency of the power plant. The conventional form of inspection consists of manual inspection with a thermal camera which takes several days as fields contain thousands of panels. Solar panel installation is costly, and the installation does not guarantee maximum power generation without proper maintenance and handling. A drone with a thermal camera payload was developed to reduce labor costs as well as increase efficiency of the inspection as it can survey the field with a large field of view. Several image processing methods were used to process …

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An Experimental Study On Concrete’S Durability And Mechanical Characteristics Subjected To Different Curing Regimes, Edgar L.S. Borrero, Visar Farhangi, Kazem Jadidi, Moses Karakouzian Apr 2021

An Experimental Study On Concrete’S Durability And Mechanical Characteristics Subjected To Different Curing Regimes, Edgar L.S. Borrero, Visar Farhangi, Kazem Jadidi, Moses Karakouzian

Civil and Environmental Engineering and Construction Faculty Research

Considering a constant demand in construction of concrete structures to develop novel approaches for predicting the concert’s properties, a host of investigations were performed on concrete’s mechanical properties and durability under various curing regimes. However, few studies were concerned with evaluating the concrete’s durability using non-destructive concrete surface resistivity tests by applying various curing conditions. The present study compares the influence of different curing regimes on durability and compressive strength of concrete to recommend the most effective curing conditions on concrete’s characteristics. Five curing conditions including ambient, laboratory, dry oven, wet oven and 7-days were analyzed. Accordingly, a non-destructive concrete …

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Analysis Of The Interfacial Reaction Between Bulk Metallic Glass Coated Copper, Nickel, And Titanium With Lead-Free Solders, Andromeda Dwi Laksono, Yee-Wen Yen, Rifqi Aulia Tanjung, Teodoro A. Amatosa, Ruki Harwahyu Apr 2021

Analysis Of The Interfacial Reaction Between Bulk Metallic Glass Coated Copper, Nickel, And Titanium With Lead-Free Solders, Andromeda Dwi Laksono, Yee-Wen Yen, Rifqi Aulia Tanjung, Teodoro A. Amatosa, Ruki Harwahyu

Makara Journal of Technology

Bulk metallic glass (BMG) has good mechanical strength, high hardness, wear resistance, and corrosion resistance with promising application in various industries. However, for the industrial production of BMG, the main issue is how to overcome limitations of joining with other materials. The present study focuses on solder processing at low operating temperature to avoid exceeding the recrystallization temperature. A feasible joining process for BMG was developed using lead-free solders. The BMG surface is pre-plated with copper, nickel, or titanium as a wetting layer. The reaction temperature is set between the glass transition temperature of BMG and the melting point of …

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Design Of Ac Microgrid Topology With Photovoltaic Uncertainties In A Rural Village, Vannak Vai Apr 2021

Design Of Ac Microgrid Topology With Photovoltaic Uncertainties In A Rural Village, Vannak Vai

Makara Journal of Technology

Energy needs are increasing day by day, especially for developing countries, due to population growth and changing lifestyles. A suitable microgrid topology with renewable energy integration is considered to fulfill the people and society’s needs. This paper focuses on the design of AC microgrid topology for a nonelectrified village with the integration of PV uncertainties in both sitting and sizing. The development of an optimal algorithm based on the conductor use minimization and unbalanced load improvement is proposed. The shortest path is proposed to search for the minimum conductor use. Then, the algorithm for improving the unbalanced load with two …

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Mean-Shift Object Tracking Algorithm With Systematic Sampling Technique, Yoanes Bandung, Aris Ardiansyah Apr 2021

Mean-Shift Object Tracking Algorithm With Systematic Sampling Technique, Yoanes Bandung, Aris Ardiansyah

Makara Journal of Technology

Mean shift is a fast object tracking algorithm that only considers pixels in an object area, hence its relatively small computational load. This algorithm is suitable for use in real-time conditions in terms of execution time. The use of histograms causes this algorithm to be relatively resistant to rotation and changes in object size. However, its resistance to lighting changes is not optimal. This study aims to improve the performance of the algorithm under lighting changes and reduce its processing time. The proposed technique involves the use of sampling techniques to reduce the number of iterations, optimization of candidate search …

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Analysis Of Correlation And Mapping Of Chlorophyll-A Concentrations And Sea Surface Temperatures In Coastal Areas Based On Terra Modis Satellite Image Data, Hendrata Wibisana, Bangun Muljo Sukotjo, Umboro Lasminto Apr 2021

Analysis Of Correlation And Mapping Of Chlorophyll-A Concentrations And Sea Surface Temperatures In Coastal Areas Based On Terra Modis Satellite Image Data, Hendrata Wibisana, Bangun Muljo Sukotjo, Umboro Lasminto

Makara Journal of Technology

Ecosystems in aquatic environments are distinct from ecosystems on land. Changes that occur in ecosystems in aquatic environments affect the lives of biota in these waters, including the fish used as a food source in fishing communities in coastal areas. This study aims to determine the role of remote sensing in mapping and analyzing the relationship between the parameters of sea surface temperature and chlorophyll-a concentrations on the coast. The correlation of sea surface temperature with chlorophyll-a concentrations is modeled via linear regression. An analysis of variance test is performed to establish the suitability of the temperature data for the …

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A Comparative Study Between 6 Degree-Of-Freedom Trajectory Model And Modified Point Mass Trajectory Model Of Spinning Projectiles, Ange Du Apr 2021

A Comparative Study Between 6 Degree-Of-Freedom Trajectory Model And Modified Point Mass Trajectory Model Of Spinning Projectiles, Ange Du

Doctoral Dissertations and Master's Theses

For spinning projectiles, the 6 Degree-of-Freedom model can closely capture their trajectories with high accuracy and details. However, it comes with the drawbacks of long computation time and needing many aerodynamic coefficients which can be hard to obtain. The Modified Point Mass Trajectory Model was introduced as a simplified solution. This work compares them with each other, and with some more conventional methods. A program is developed to simulate and visualize trajectories. With some augmentations, the Modified Point Mass model is able to generate comparable results in most cases, but not including special cases such as when the projectile is …

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The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement, Shi Xu, Xueyan Liu, Amir Tabakovic, P Lin, Y Zhang, S Nahar, B J. Lommerts, Erik Schlangen Apr 2021

The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement, Shi Xu, Xueyan Liu, Amir Tabakovic, P Lin, Y Zhang, S Nahar, B J. Lommerts, Erik Schlangen

Articles

Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the rejuvenator. Then the released rejuvenator wets the crack surfaces, diffuses into and softens the aged bitumen, allowing two broken edges to come in the contact, preventing further asphalt pavement deterioration. The quality and speed of the damage repair process strongly depend on the quality of rejuvenator, thus it is important to choose a proper …

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Plant-Wide Control System Proposal Of Ethylene Cracking Plant Simulation, Estelle Seghers Apr 2021

Plant-Wide Control System Proposal Of Ethylene Cracking Plant Simulation, Estelle Seghers

Honors Capstones

No abstract provided.

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Development And Mechanical Characterization Of A Composite Biomaterial Made From Agricultural Waste Reinforcement In A Fungal Mycelium Matrix., John Adam Howe Apr 2021

Development And Mechanical Characterization Of A Composite Biomaterial Made From Agricultural Waste Reinforcement In A Fungal Mycelium Matrix., John Adam Howe

Honors Capstones

No abstract provided.

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Velocity Distribution And Stress Analysis In A Continuous Exchange Cell-Free Protein Synthesis System, Grace Nguyen Apr 2021

Velocity Distribution And Stress Analysis In A Continuous Exchange Cell-Free Protein Synthesis System, Grace Nguyen

Honors Capstones

No abstract provided.

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Lean Implementation In An Aquatic Cryopreservation Laboratory, Jennafer Zimmerman Apr 2021

Lean Implementation In An Aquatic Cryopreservation Laboratory, Jennafer Zimmerman

Honors Capstones

No abstract provided.

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A Work Of Heart Apr 2021

A Work Of Heart

DePaul Magazine

This article looks at the internship opportunities that DePaul students have available to kickstart their career through such programs as DePaul WORKS and INSuRE. Alumni in the museum, education and counseling, cybersecurity, law and public relations fields are interviewed.

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A Study Of Policy Implementation And Community Participation In The Municipal Solid Waste Management In The Philippines, Mary E.C. Camarillo, Luzvisminda M. Bellotindos Apr 2021

A Study Of Policy Implementation And Community Participation In The Municipal Solid Waste Management In The Philippines, Mary E.C. Camarillo, Luzvisminda M. Bellotindos

Applied Environmental Research

Municipal solid waste (MSW) management has become one of the most pressing environmental concerns of the Philippines at present. Several measures have been implemented to circumvent this issue, including waste management policies stipulated in the Ecological Solid Waste Management Act of 2001.  However, the implementation of these policies even at the barangay level has always been a challenge.  Hence, this study assessed the compliance of selected barangays in Cebu City, Philippines, specifically to the integrated solid waste management plan based on the 3R’s (reduce, reuse, and recycle).  A descriptive quantitative method was utilized in this study. There were 1523 residents …

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Characteristics Of Surface Water Quality And Diversity Of Zoobenthos In Water Bodies, An Giang Province, Vietnam, Giao Thanh Nguyen, Thi Hong Nhien Huynh, Hoang Dan Truong Apr 2021

Characteristics Of Surface Water Quality And Diversity Of Zoobenthos In Water Bodies, An Giang Province, Vietnam, Giao Thanh Nguyen, Thi Hong Nhien Huynh, Hoang Dan Truong

Applied Environmental Research

The use of zoobenthos to evaluate water quality has gained considerable interest due to its low cost and environmental friendliness. This study analyzed water and zoobenthos samples at 13 sites in the water bodies in An Giang province in the rainy season (on March) and dry season (on September) in 2018. The results showed that the surface water was contaminated by organic matters, suspended solids and coliforms. There was occurrence of 28 species of zoobenthos divided into five classes including Oligochaeta, Polychaeta, Insecta, Gastropoda, and Bivalvia in which Bivalvia was the most diverse class accounting for 75%. The densities of …

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In Situ Tem Characterization Of Microstructure Evolution And Mechanical Behavior Of The 3d-Printed Inconel 718 Exposed To High Temperature, Supriya Koul, Le Zhou, Omar Ahmed, Yongho Sohn, Tengfei Jiang, Akihiro Kushima Apr 2021

In Situ Tem Characterization Of Microstructure Evolution And Mechanical Behavior Of The 3d-Printed Inconel 718 Exposed To High Temperature, Supriya Koul, Le Zhou, Omar Ahmed, Yongho Sohn, Tengfei Jiang, Akihiro Kushima

Mechanical Engineering Faculty Research and Publications

This in situ transmission electron microscopy work presents a nanoscale characterization of the microstructural evolution in 3D-printed Inconel 718 (IN718) while exposed to elevated temperature and an associated change in the mechanical property under tensile loading. Here, we utilized a specially designed specimen shape that enables tensile testing of nano-sized thin films without off-plane deformations. Additionally, it allows a seamless transition from the in situ heating to tensile experiment using the same specimen, which enables a direct correlation of the microstructure and the mechanical property of the sample. The method was successfully used to observe the residual stress relaxation and …

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Composition-Dependent Solidification Cracking Of Aluminum-Silicon Alloys During Laser Powder Bed Fusion, Holden Hyer, Le Zhou, Abhishek Mehta, Sharon Park, Thinh Huynh, Shutao Song, Yuanli Bai, Kyu Cho, Brandon Mcwilliams, Yongho Sohn Apr 2021

Composition-Dependent Solidification Cracking Of Aluminum-Silicon Alloys During Laser Powder Bed Fusion, Holden Hyer, Le Zhou, Abhishek Mehta, Sharon Park, Thinh Huynh, Shutao Song, Yuanli Bai, Kyu Cho, Brandon Mcwilliams, Yongho Sohn

Mechanical Engineering Faculty Research and Publications

Consistent manufacturing of volumetrically dense engineering components, free of solidification cracks by laser powder bed fusion (LPBF), has been demonstrated for Al-Si alloys such as AlSi10Mg and Al12Si. The success in LPBF of these alloys is attributed to the near eutectic composition with a small freezing range. To illuminate this observation, cracking susceptibility was examined from Scheil-Gulliver solidification modeling by calculating the hot cracking susceptibility, |dT/dfS1/2|. To validate the findings from hot cracking susceptibility calculations, six binary Al-Si alloys, whose compositions were strategically chosen at hypo-, near-, and hyper-eutectic compositions, were gas atomized into alloy powders, and …

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Design Of An Ultra-Wideband Frequency-Modulated Continuous Wave Short Range Radar System For Extending Independent Living, Toai-Chi Nguyen Apr 2021

Design Of An Ultra-Wideband Frequency-Modulated Continuous Wave Short Range Radar System For Extending Independent Living, Toai-Chi Nguyen

Master's Theses

Falls in the disabled and elderly people have been a cause of concern as they can be immobilized by the fall and have no way to contact others and seek assistance. The proposed frequency modulated continuous wave (FMCW) short range radar (SRR) system, which uses ultra-wideband (UWB) signals can provide immediate assistance by monitoring and detecting fall events. The unique characteristics of this system allow for a frequency-based modulation system to carry out triangulation and sense the location of the fall through the usage of a continuous chirp signal that linearly sweeps frequency. This project focuses on the development, design …

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Ambient And Indoor Pm10 And Pm10-Bound Pahs Around The Vicinity Of An Industrial Estate In Rayong, Thailand: Concentration And Source Identification, Navaporn Kanjanasiranont, Tassanee Prueksasit, Narut Sahanavin Apr 2021

Ambient And Indoor Pm10 And Pm10-Bound Pahs Around The Vicinity Of An Industrial Estate In Rayong, Thailand: Concentration And Source Identification, Navaporn Kanjanasiranont, Tassanee Prueksasit, Narut Sahanavin

Applied Environmental Research

The ambient and indoor air concentrations of PM10 and PM10-bound PAHs (16 priority PAHs) were investigated in Rayong Province, Thailand. The locations of the selected study areas were Map Ta Phut Industrial Estate and its vicinity comprising six sampling sites (four industrial areas and two vicinity areas). The indoor and ambient air samples of were collected in March 2017. The sampling sites located close to the road were detected the greatest ambient average concentrations of PM10, with an average value of 56.06 µg m-3 (Map Chalut Area or MC). The levels of indoor PM10 were mostly dependent on the resident …

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Inspection And Understanding Of Sewer Network Condition In Dindaeng District (Thailand), Hnin E. Phyu, Sutha Khaodhiar Apr 2021

Inspection And Understanding Of Sewer Network Condition In Dindaeng District (Thailand), Hnin E. Phyu, Sutha Khaodhiar

Applied Environmental Research

Sewer pipelines are usually operated with little maintenance after installation. After years in service, sewer pipes get old and deteriorated.  The present research is the first study that attempts to inspect the condition of sewer pipelines in the Bangkok Metropolitan Area. A robot with Closed Circuit Television (CCTV) was used to capture videos and images of the interior of the sewer pipelines between two manholes. The system was operated by Utility Business Alliance (UBA) Company. The condition of the sewer pipelines was visually analyzed in line with the scoring and grading system of New Zealand’s pipe inspection manual. CCTV footage …

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Consequence Of Seawater Intrusion On Soil Properties In Agricultural Areas Of Nonthaburi Province, Thailand, Napaporn Phankamolsil, Kiattisak Sonsri, Yutthana Phankamolsil Apr 2021

Consequence Of Seawater Intrusion On Soil Properties In Agricultural Areas Of Nonthaburi Province, Thailand, Napaporn Phankamolsil, Kiattisak Sonsri, Yutthana Phankamolsil

Applied Environmental Research

Seawater intrusion associated with climate change and sea level rise (SLR) has been postulated for the last decade that causes negative impact on worldwide environmental resources. In Thailand, however; the information pertaining to its effect on soil properties in agricultural areas has not been clearly reported yet. Hence, this study aimed to investigate the seawater intrusion effect on soil properties in agricultural areas of Nonthaburi Province, Thailand. Five study locations, which anticipated to be affected by seawater intrusion, were selected based on the different distances from the Chao Phraya River. Soil morphological properties were recorded, besides undisturbed soil samples at …

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Air Quality Indexing, Mapping And Principal Components Analysis Of Ambient Air Pollutants Around Farm Settlements Across Ogun State, Nigeria, Funmilola Oyebanji, Godson Ana, Opeyemi Tope-Ajayi, Adebayo Sadiq, Yahaya Mijinyawa Apr 2021

Air Quality Indexing, Mapping And Principal Components Analysis Of Ambient Air Pollutants Around Farm Settlements Across Ogun State, Nigeria, Funmilola Oyebanji, Godson Ana, Opeyemi Tope-Ajayi, Adebayo Sadiq, Yahaya Mijinyawa

Applied Environmental Research

The focus of this study was to portray the spatial pattern of air quality across seasons in the eight sampled farm settlements using air quality indexes and assess the clusters of monitored air pollutants. The concentrations of air pollutants were determined using in-situ portable gas detectors and particulate counter. The AQI for each criteria pollutants (CO, O3, TSP, PM10, SO2, and PM2.5) was calculated using AQI formulae of the United States Environmental Protection Agency and mapped using the Inverse distance weighting (IDW) interpolation method in the Geographic information systems (GIS) environment. Principal component analysis (PCA) was used to group the …

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Treatment Of Iron From Groundwater By Ozonation: Influence Of Hardness As A Scavenger, Apiradee Sukmilin, Ratsamee Sangsirimongkolying Apr 2021

Treatment Of Iron From Groundwater By Ozonation: Influence Of Hardness As A Scavenger, Apiradee Sukmilin, Ratsamee Sangsirimongkolying

Applied Environmental Research

This study assesses the efficiency of using ozone technology to treat iron from groundwater while hardness acts as a radical scavenger. Batch experiments were conducted to determine the effects of initial pH 6, 7 and 8, and hardness of 300, 400 and 500 mg L-1 and kinetic analysis. The optimum conditions were found to be initial pH of 8 and hardness of 300 mg L-1. The removal efficiency of iron by ozonation was 99.97%, which was higher than that of air without ozone applied (83.67%). However, the presence of hardness and tert-butanol (TBA) had a negative effect on the …

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