Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

132,648 Full-Text Articles 153,525 Authors 44,573,586 Downloads 284 Institutions

All Articles in Engineering

Faceted Search

132,648 full-text articles. Page 6 of 3674.

Scaling Relationships Across Chemically Related Adsorbates For Fast Screening Of Alloy Catalysts For Propane Dehydrogenation, Anne Esther Serban, Ranga Rohit Seemakurthi, Brandon C. Bukowski, Jeffrey Greeley 2018 University of Illinois at Chicago

Scaling Relationships Across Chemically Related Adsorbates For Fast Screening Of Alloy Catalysts For Propane Dehydrogenation, Anne Esther Serban, Ranga Rohit Seemakurthi, Brandon C. Bukowski, Jeffrey Greeley

The Summer Undergraduate Research Fellowship (SURF) Symposium

A catalyst is a material which speeds up the rate of a specific reaction. A reaction that is of significant importance to the chemical industry is the selective transformations of light alkanes (ethane, propane), which are largely available in shale gas, to olefins. These olefins can then be converted into higher-value chemicals, materials, and fuels. However, there are several undesired reactions that take place alongside the main dehydrogenation reaction, so a catalyst of high selectivity is desired. Apart from the industrially used PtSn catalyst, work by our experimental collaborators has shown that various other Pt and Pd alloys (In, Zn ...


Computational Catalysis: Creating A User-Friendly Tool For Research And Education, Kevin P. Greenman, Peilin Liao 2018 University of Michigan - Ann Arbor

Computational Catalysis: Creating A User-Friendly Tool For Research And Education, Kevin P. Greenman, Peilin Liao

The Summer Undergraduate Research Fellowship (SURF) Symposium

Catalysis is used in a significant portion of production processes in the industrialized world, including most processing of chemicals and fuels. This makes maximizing the efficiency of catalysts a high priority. However, the immense number of candidates for new catalysts precludes the possibility of testing all of them by experiments. Density functional theory (DFT) has been widely and successfully used to calculate material properties relevant to catalysis and to screen promising candidates for experimental testing, but there currently exists no publicly- available, user-friendly tool for performing these DFT calculations. This work details the development of such a tool for nanoHUB ...


Bringing Particle Scale Properties Into Descriptions Of Powder Behavior Through The Enhanced Centrifuge Method, Andrew R. Roginski, Caralyn A. Coultas-Mckenney, Contessa G. Norris, Stephen P. Beaudoin 2018 Purdue University

Bringing Particle Scale Properties Into Descriptions Of Powder Behavior Through The Enhanced Centrifuge Method, Andrew R. Roginski, Caralyn A. Coultas-Mckenney, Contessa G. Norris, Stephen P. Beaudoin

The Summer Undergraduate Research Fellowship (SURF) Symposium

Inconsistent powder behavior introduces problems such as agglomeration, poor flowability, dust hazards, and segregation that decrease efficiency in powder processing environments. Understanding how a powder interacts with a surface at the particle scale provides insight into how to accommodate individual particle properties and avoid process deficiencies. This project uses an enhanced centrifuge technique to evaluate the adhesion between a stainless-steel surface and a powder comprised of fluorescent particles. Particles are deposited onto stainless steel plates which are rotated in a centrifuge. The adhesion properties are monitored by tracking the rotational speed at which particles of a known size are removed ...


Grain Boundary Motion Analysis, Jeremy Marquardt, Xiaorong Cai, Marisol Koslowski 2018 Purdue University

Grain Boundary Motion Analysis, Jeremy Marquardt, Xiaorong Cai, Marisol Koslowski

The Summer Undergraduate Research Fellowship (SURF) Symposium

Grain growth is a mechanism to relax residual stresses in thin films. These grains grow out of the thin film surface and are known as whiskers. These whiskers can cause short circuits, so developing scalable and cost effective solutions would increase the reliability and utility of tin electronics. A popular of method of examining tin whiskering is microscopic simulation, as it provides an accurate and cost effective way to predict the consequences of proposed models. Specifically examining the evolution of grain boundaries, this paper aims to present the results of grain boundary motion simulations through a generalized program that streamlines ...


"I Don't Belong With All The Really Smart Kids Here": Student Characterizations Of Belonging In Engineering, Lisa J. Musselman, Jacqueline A. Rohde, Brianna S. Benedict, Allison Godwin 2018 University of Dayton

"I Don't Belong With All The Really Smart Kids Here": Student Characterizations Of Belonging In Engineering, Lisa J. Musselman, Jacqueline A. Rohde, Brianna S. Benedict, Allison Godwin

The Summer Undergraduate Research Fellowship (SURF) Symposium

This research paper is a qualitative study of how students with diverse demographics, mindsets, and identities describe what it means to belong in engineering. Engineering students’ sense of belonging has a significant impact on students’ decisions to leave engineering. Talented students who feel that they do not belong in engineering are more likely to leave than their peers. Previous studies have focused on belonging for underrepresented students in engineering (e.g., women or minorities) or specific factors contributing to student belonging (e.g., classroom performance). However, few have explored how students describe what it means for them to belong in ...


Developing Strategies To Toughen Bio-Inspired Adhesives, Narelli P. Narciso, Samuel Lee Huntington, Jonathan J. Wilker 2018 Indiana University of Pennsylvania

Developing Strategies To Toughen Bio-Inspired Adhesives, Narelli P. Narciso, Samuel Lee Huntington, Jonathan J. Wilker

The Summer Undergraduate Research Fellowship (SURF) Symposium

Mussels and other marine creatures adhere very well in underwater environments, having the ability to withstand the force of the sea. These animals have inspired synthetic biomimetic adhesives for wet systems, presenting potential for biomedical applications. However, most current commercial adhesives tend to be brittle, not resisting repetitive movements. This study assesses toughening strategies to improve the mussel-inspired adhesives’ ductility while maintaining its strength. The strategies included altering the polymer’s chemical structure by changing the percentage of polyethylene glycol (PEG) in the molecule and by adding fillers, such as calcium carbonate, silica and nacre - a calcium carbonate compound found ...


Evaluation And Analysis Of Ethane Transformation To Liquid Hydrocarbons Through Steam Cracking, Christian Omar Villa Santos, Wasiu Peter Oladipupo, Taufik Ridha, Rakesh Agrawal 2018 University of Puerto Rico, Mayaguez

Evaluation And Analysis Of Ethane Transformation To Liquid Hydrocarbons Through Steam Cracking, Christian Omar Villa Santos, Wasiu Peter Oladipupo, Taufik Ridha, Rakesh Agrawal

The Summer Undergraduate Research Fellowship (SURF) Symposium

Process design and sensitivity studies for a steam cracking reactor was performed. Steam cracking is commonly employed to convert ethane to ethylene, a building block of many other products. Although this technology is generally employed at large scale (>6 Billion pounds of ethylene per year), understanding the process and its economic performance is critical to set target criteria for other processes under development. Aspen Plus was used to simulate the ethane steam cracking reactor and other process units. Sensitivity analysis was performed to determine the most efficient and cost-effective operation regarding product yield. The results show that the maximum product ...


Fluidic Control With Wax Valves For Paper-Based Diagnostics, Emilie I. Newsham, Elizabeth A. Phillips, Katherine N. Clayton, Jacqueline C. Linnes 2018 Purdue University

Fluidic Control With Wax Valves For Paper-Based Diagnostics, Emilie I. Newsham, Elizabeth A. Phillips, Katherine N. Clayton, Jacqueline C. Linnes

The Summer Undergraduate Research Fellowship (SURF) Symposium

Paper-fluidic devices are a common platform for point-of-care disease detection in under-resourced areas because of their low cost and minimal instrumentation requirements. Limited fluidic control in paper-fluidic devices has hindered the incorporation of multistep reactions that are necessary for more sensitive disease detection. One potential fluidic control mechanism is the incorporation of thermally actuated wax valves to separate assay stages. Such valving would expand the detection capabilities of these devices by permitting fluid obstruction for sustained reactions and facilitating controlled volume release within a fully-automated, self-contained device. Despite the potential to exploit wax valves for innovative paper-fluidic diagnostics, a thorough ...


Deep Neural Network Architectures For Modulation Classification Using Principal Component Analysis, Sharan Ramjee, Shengtai Ju, Diyu Yang, Aly El Gamal 2018 Purdue University

Deep Neural Network Architectures For Modulation Classification Using Principal Component Analysis, Sharan Ramjee, Shengtai Ju, Diyu Yang, Aly El Gamal

The Summer Undergraduate Research Fellowship (SURF) Symposium

In this work, we investigate the application of Principal Component Analysis to the task of wireless signal modulation recognition using deep neural network architectures. Sampling signals at the Nyquist rate, which is often very high, requires a large amount of energy and space to collect and store the samples. Moreover, the time taken to train neural networks for the task of modulation classification is large due to the large number of samples. These problems can be drastically reduced using Principal Component Analysis, which is a technique that allows us to reduce the dimensionality or number of features of the samples ...


Virtual Reality For Baseball Batting, Fengchen Gong, Tianjie Jia, Hong Tan, Casey Kohr 2018 Purdue University

Virtual Reality For Baseball Batting, Fengchen Gong, Tianjie Jia, Hong Tan, Casey Kohr

The Summer Undergraduate Research Fellowship (SURF) Symposium

Nowadays, researchers explore the applications of Virtual Reality in different aspects of people’s lives. A few studies of Virtual Reality focus on applications in sports training. In this research area, one of the most important benefits is that athletes can focus on the training of one specific skill at one time. This SURF project focuses on the development of the virtual reality environment by designing targeted training for baseball batters, with the goal to achieve sufficient realism as judged by the Purdue baseball coaches. With the Virtual Reality training, baseball batters can practice and perfect a specific skill without ...


Flow Measurement Using Electron Beam Flourescence, Richard Brookes, Andrew Strongrich, Anthony G Cofer, Alina Alexeenko 2018 Purdue University

Flow Measurement Using Electron Beam Flourescence, Richard Brookes, Andrew Strongrich, Anthony G Cofer, Alina Alexeenko

The Summer Undergraduate Research Fellowship (SURF) Symposium

Low density, high-speed flows are of interest to many research areas including, spacecraft thrusters, hypersonic vehicle control, and atmospheric re-entry studies. Measurement of low-density gas flows by traditional methods such as Schlieren Photography or Particle Image Velocimetry is often not possible. In order to yield new information about gas behavior at low densities the technique of electron beam fluorescence is being re-evaluated. By recreating previous electron beam fluorescence setups used to measure density, the experiment operating parameters including beam strength and density ranges are assessed and a foundation can be built for further experimentation. Comparing intensity plots of imaged flows ...


Thin Film Cocaine Sensors, Datta Sheregar, Vick Hung, Jenna Walker, Orlando Hoilett, Jacqueline Linnes, Robert Nawrocki 2018 Purdue University

Thin Film Cocaine Sensors, Datta Sheregar, Vick Hung, Jenna Walker, Orlando Hoilett, Jacqueline Linnes, Robert Nawrocki

The Summer Undergraduate Research Fellowship (SURF) Symposium

Over 7 million Americans suffer from a drug use disorder and up to 60% of individuals treated for addiction will ultimately relapse. We are developing ultra-thin film electrodes on a wearable substrate for a sensor that can detect minute amounts of cocaine in sweat droplets secreted from the skin. This will enable wearable drug monitoring for personalized rehabilitation treatment plans and improve long-term addiction recovery rates. The current research focuses on developing a thin-film sensor that can be applied directly to the skin. First a layer of PVP (poly4-vinylphenol) was prepared and then spun coated onto a piece of glass ...


Spatial Variation Of Surface Residual Stress In Metallic Materials, Chengyang Zhang, David Bahr, Siavash Ghanbari, Raheleh Mohammad Rahimi 2018 Purdue University

Spatial Variation Of Surface Residual Stress In Metallic Materials, Chengyang Zhang, David Bahr, Siavash Ghanbari, Raheleh Mohammad Rahimi

The Summer Undergraduate Research Fellowship (SURF) Symposium

Shot peening is commonly used to reduce fatigue failures in industrial parts by introducing compressive residual stress into the surface of a material. However, it is challenging to assess the performance of the parts without destroying them. Solving this problem requires a combined model that predicts both recrystallization and residual stress using experimental measurements and predictive computational modelling. Experiments were performed to prove that the surface properties of materials after thermal treatments can be accessed, and the spatial variation of residual stress in metallic materials, including the relationship between surface and subsurface behavior can be evaluated. This process involves investigating ...


Targeted Epigenetic Editing Using Optogenetic Tools, Joshua Hahn, Chongli Yuan 2018 Purdue University

Targeted Epigenetic Editing Using Optogenetic Tools, Joshua Hahn, Chongli Yuan

The Summer Undergraduate Research Fellowship (SURF) Symposium

Epigenetics markers, such as DNA methylation and histone post-translational modifications, are modifications to the structure of DNA that impact gene expression without altering the genetic code. Among them, DNA methylation plays a critical role in various biological processes including the differentiation of stem cells, regulation of gene expression, and adaptation to environmental signals. The ability to modify DNA methylation at particular genes in various cell types is thus desirable for engineering specific cell phenotypes. Although technologies exist that can alter DNA methylation at target genes, these techniques lack spatial and temporal resolution and are not able to selectively edit individual ...


Remote Sensing Using I-Band And S-Band Signals Of Opportunity, Kadir Efecik, Benjamin R. Nold, James L. Garrison 2018 Purdue University

Remote Sensing Using I-Band And S-Band Signals Of Opportunity, Kadir Efecik, Benjamin R. Nold, James L. Garrison

The Summer Undergraduate Research Fellowship (SURF) Symposium

Measurement of soil moisture, especially the root zone soil moisture, is important in agriculture, meteorology, and hydrology. Root zone soil moisture is concerned with the first meter down the soil. Active and passive remote sensing methods used today utilizing L-band(1-2GHz) are physically limited to a sensing depth of about 5 cm or less. To remotely sense the soil moisture in the deeper parts of the soil, the frequency should be lowered. Lower frequencies cannot be used in active spaceborne instruments because of their need for larger antennas, radio frequency interference (RFI), and frequency spectrum allocations. Ground-based passive remote sensing ...


Determining The Optimal Traffic Opening Time Using Piezoelectric Sensors, Adlan Amran, Yen-Fang Su, Na Lu 2018 Purdue University

Determining The Optimal Traffic Opening Time Using Piezoelectric Sensors, Adlan Amran, Yen-Fang Su, Na Lu

The Summer Undergraduate Research Fellowship (SURF) Symposium

The Indiana Department of Transportation (INDOT) requires a reliable method of determining the early age quality of concrete to improve traffic opening time. We propose to develop an in-situ method that enables an accurate, efficient, and non-destructive health monitoring of concrete using the electromechanical impedance (EMI) technique coupled with a piezoelectric sensor named Lead Zirconate Titanate (PZT). The test was conducted by mounting a PZT sensor on mortar samples. The PZT sensor was then excited by a voltage to track the strengthening of samples. The data obtained from the EMI technique was refined using the Root Mean Square Deviation (RMSD ...


Tool For Correlating Ebsd And Afm Data Arrays, Andrew Krawec, Matthew Michie, John Blendell 2018 Purdue University

Tool For Correlating Ebsd And Afm Data Arrays, Andrew Krawec, Matthew Michie, John Blendell

The Summer Undergraduate Research Fellowship (SURF) Symposium

Ceramic and semiconductor research is limited in its ability to create holistic representations of data in concise, easily-accessible file formats or visual data representations. These materials are used in everyday electronics, and optimizing their electrical and physical properties is important for developing more advanced computational technologies. There is a desire to understand how changing the composition of the ceramic alters the shape and structure of the grown crystals. However, few accessible tools exist to generate a dataset with the proper organization to understand correlations between grain orientation and crystallographic orientation. This paper outlines an approach to analyzing the crystal structure ...


Building Modern Cloud Accessible Tools For Materials Simulations, Nicholas J. Finan, Saaketh Desai, Samuel Reeve, Alejandro Strachan 2018 Purdue University

Building Modern Cloud Accessible Tools For Materials Simulations, Nicholas J. Finan, Saaketh Desai, Samuel Reeve, Alejandro Strachan

The Summer Undergraduate Research Fellowship (SURF) Symposium

In recent years, commercial computer systems have grown more user friendly, allowing for new users to quickly and easily make contributions. Unfortunately, this trend is not as apparent in the field of computational materials simulations. The tools used by researchers in this field have remained just as esoteric as the systems of the past. While the methods used in materials simulations continue to grow in complexity and accuracy, the user experience has been neglected entirely. This project aims to eliminate the need for hours spent adjusting file formats and searching for preexisting code, and instead allow researchers to focus on ...


Load Distribution Of Adjacent Prestressed Concrete Box Beam Bridges, Luis F. Urrego, Ryan T. Whelchel, Robert J. Frosch, Christopher S. Williams 2018 Universidad de Los Andes - Colombia

Load Distribution Of Adjacent Prestressed Concrete Box Beam Bridges, Luis F. Urrego, Ryan T. Whelchel, Robert J. Frosch, Christopher S. Williams

The Summer Undergraduate Research Fellowship (SURF) Symposium

One of the most common bridge types is the adjacent prestressed concrete box beam bridge because the system is economical and simple to build; over 43,000 are currently in service within the US. However, they are highly susceptible to strand corrosion and concrete deterioration which can result in early loss of load capacity. Therefore, an experimental program sponsored by the Indiana Department of Transportation (INDOT) was initiated to determine the behavior of deteriorated beams and develop recommendations for load rating and design of this bridge type. Displacement sensors were installed on a bridge in service to measure its deformation ...


A High-Efficiency Low Power Rectifier For Wireless Power Transfer, Zachary Loy, Alden Fisher, Brian Vaughn, Dimitrios Peroulis 2018 Purdue University

A High-Efficiency Low Power Rectifier For Wireless Power Transfer, Zachary Loy, Alden Fisher, Brian Vaughn, Dimitrios Peroulis

The Summer Undergraduate Research Fellowship (SURF) Symposium

With the number of implantable devices that utilize electronics increasing, there is an increasing need to find alternative ways of powering them. Currently, surgery is required to replace a battery for these devices; however, with advancements in Wireless Power Transfer (WPT) methods, the need for further surgeries will become negated. This paper explores the ability of WPT as an alternative powering method by investigating rectifier Power Conversion Efficiency (PCE). The rectifier converts high frequency waves to Direct Current (DC) energy that can provide usable power to devices requiring electrical power. It is targeted for low power applications centered around a ...


Digital Commons powered by bepress