Browsing by Subject "Department of Mechanical and Industrial Engineering"
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Item The ASSE (2008 Fall)(2008) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem The ASSE (2008 Winter)(2008) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem The ASSE (2009 Spring)(2009) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem The ASSE (2009 Winter Break)(2009) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Carbon Nanotube Addition to Cement-Sand Based Piezoelectric Composites(2016) Kadlec, Alec; Wang, Shifa; Zhao, PingCarbon Nanotubes (CNTs) were added to a cement-sand based piezoelectric composite with consideration of Structural Health Monitoring (SHM) to improve conductivity and poling efficiency, increasing piezoelectric effects. The addition of CNTs to the composite structure formed continuous electric networks between the Lead Zirconate Titanate (PZT) particles, allowing more effective poling. Samples of 50 volume percent PZT were fabricated with a mixture of PZT powder, white Portland cement, graded silica sand, CNTs and a superplasticizer, and cured at room temperature. The properties of the composite, including piezoelectric coefficient and sensing effects were characterized for a range of CNT inclusion from 0 to 0.9 vol %. Results showed that CNT inclusion allowed for effective room temperature poling, improving piezoelectric properties of the composite. The modified composite was optimal at 0.6 vol % CNTs.Item Collection and Analysis of Soil Thermal Property Data under Minnesota's Local Conditions(2021-08-10) Tom, Gloria WThe aim of this research was to collect and collate soil thermal property data across Minnesota to support the ongoing modelling of Ground Source Heat Pump systems (GSHPs). The soil properties of interest essential in the numerical modelling of GSHPs are thermal conductivity, density, specific heat capacity, soil layers by depth and water content. With the knowledge of these properties, the precise performance of a GSHP at a given location can be numerically established. Soil thermal property data was obtained by reaching out to Northern Groundsource Inc which is a geothermal systems company in Minnesota. Data was also obtained from the Minnesota State Climatology Office, University of Minnesota Extension, Minnesota Emergency Communications Board and Minnesota Pollution Control Agency by searching their databases and websites. The predominant soils in Southwest and South-central Minnesota which are loamy soils exhibited the highest thermal conductivity as compared to other regions. The properties were measured up to a depth of 1.83 meters and would be suitable for the design of horizontal GSHPs which are usually installed between 1.524 m and 3.048 m.Item Creating Patient-Specific Silicone 3D Models of the Aorta for TAVR Failure Mode Characterization(2021) Glenna, ColeComputed tomography (CT) images of four patients from Essentia Health in Duluth, MN were used to develop patient-specific aortic segments of the heart for benchtop failure characterization testing of transcatheter aortic valve replacement (TAVR). Materialise Mimics medical imaging software was used to segment the aortic root from CT images of the patients’ hearts. 3D models of the patients’ aortic roots were generated, and expendable molds of the models were 3D printed using an Ultimaker S5 fused deposition modeling (FDM) 3D printer. The expendable molds were printed in polyvinyl alcohol (PVA) and injected with Smooth-On Dragon Skin 20 platinum cured silicone. The PVA mold was then dissolved in circulated 75℃ water exposing the patient-specific silicone aortic root model. This process for 3D printing expendable mold patterns of patient-specific aortic roots can be utilized in the medical device industry for TAVR failure mode benchtop testing and will serve to predict patient outcomes more accurately for patients who are being considered for transcatheter aortic valve replacement.Item Flame Analysis System for Methane-Ammonia Diffused Gas Using Schlieren Technique(2023-06) Sayed, RafiaOptical diagnostics utilizing imaging system have been significant in the experiments of combustion and fluids. Nonetheless, the majority of imaging techniques primarily focus on the analysis of premixed flames. As the interest in alternative fuel systems utilizing diffused gas increases, there is a high demand for the advancement of methods that enable the analysis of diffused flames. The objective of this research is to create a novel Schlieren system by utilizing the Z-type Schlieren technique in experimental settings, building upon the conventional methodology. Additionally, various aspects of fluid mechanics and combustion, including Schlieren imaging, have been explored through the application of multiple optical methods. Schlieren technique is an effective method for combustion diagnostics, based on the fact that light rays are bent whenever they encounter changes in the density of a fluid. Schlieren system is generally used to visualize the flow away from the surface of an object. This research applied the well-known Schlieren setup to analyze methane-ammonia diffused gas from which the hot air around the flames could be visualized. The setup has been designed by using Z-type Schlieren technique to emphasize the three major aspects of light (refraction, coma, and astigmatism). By implementing this system, the diffused flame initialization, formation, lift off and blow out could be projected and analyzed for methane-ammonia diffused flame.Item How Much and How Much Better? A Case Study of Zero-Net Energy Housing in Northern Minnesota(2022) Carlson, Sam; Wagner, Rachel; Korpi, Jonna; Caswell, Deja; Karmaker, Leah; Snow, MadelineGreenhouse gas emissions, the most prevalent being CO2, methane, and nitrous oxide are collecting in the atmosphere and impacting all organisms that reside on this planet. We have the resources, knowledge, and technology to reduce these emissions, thereby slowing, stopping, and even reversing the negative impacts if we move quickly and make the big investments needed to make a difference. Each sector can make significant contributions to reducing emissions and this paper models the energy, financial, and CO2 savings of a net-zero residential home design in a very cold climate (northern Minnesota, USA) compared with the same design built to current Minnesota Residential Energy Code minimums. Results of the modeling and next steps are discussed.Item Integrating Renewable Energy into Commercial Street Lights(2015) Hemenway, Andrew; Egbue, OnaItem Investigate Methods to Increase the Usefulness of Stereolithography 3D Printed Objects by Adding Carbon Nanotubes to Photo-Curable Resins(2014) Wagner, Karl S.This paper aims to inform the reader about the aspects of compositing carbon nanotubes in photo curable resin that is commonly used in stereo lithography 3D printers. The focus is to increase the strength of the resin to allow for a greater range of objects to be printed with SLA printers. The paper will look at the different types of carbon nanotubes that can be used, what weight percent of nanotubes in resin will most likely work best in a printing environment based on surface hardness and cure time, and comparative destructive testing. It was shown with a small sample size that the carbon nanotubes composite had lower strength but greater toughness over pure neat resin.Item Master of Environmental Health and Safety Newsletter (2006 Fall)(2006) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2006 Spring)(2006) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2008 Spring)(2008) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2009-12)(2009-12) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2010-02)(2010-02) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2010-04)(2010-04) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2010-11)(2010-11) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2011-01)(2011-01) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student SectionItem Master of Environmental Health and Safety Newsletter (2011-04)(2011-04) American Society of Safety Engineers Northwest Chapter. University of Minnesota Duluth Student Section