Matching Items (7)
Description
The demand for miniaturized components with feature sizes as small as tens of microns and tolerances as small as 0.1 microns is on the rise in the fields of aerospace, electronics, optics and biomedical engineering. Micromilling has proven to be a process capable of generating the required accuracy for these features and is an alternative to various non-mechanical micro-manufacturing processes which are limited in terms of cost and productivity, especially at the micro-meso scale. The micromilling process is on the surface, a miniaturized version of conventional milling, hence inheriting its benefits. However, the reduction in scale by a few magnitudes makes the process peculiar and unique; and the macro-scale theories have failed to successfully explain the micromilling process and its machining parameters. One such characteristic is the unpredictable nature of tool wear and breakage. There is a large cost benefit that can be realized by improving tool life. Workpiece rejection can also be reduced by successfully monitoring the condition of the tool to avoid issues. Many researchers have developed Tool Condition Monitoring and Tool Wear Modeling systems to address the issue of tool wear, and to obtain new knowledge. In this research, a tool wear modeling effort is undertaken with a new approach. A new tool wear signature is used for real-time data collection and modeling of tool wear. A theoretical correlation between the number of metal chips produced during machining and the condition of the tool is introduced. Experimentally, it is found that the number of chips produced drops with respect to the feedrate of the cutting process i.e. when the uncut chip thickness is below the theoretical minimum chip thickness.
ContributorsBajaj, Anuj Kishorkumar (Author) / SODEMANN, ANGELA A (Thesis advisor) / Bekki, Jeniffer (Committee member) / Hsu, Keng (Committee member) / Arizona State University (Publisher)
Created2015
Description
Height is an essential measure for the evaluation of an adult's health, and especially important for the measure of children's health.4 Lasers have been popularly used in many areas such as construction, engineering, government for defense purposes, and for equestrians. Lasers are depended on for their accuracy, reliability, and ease of use.8, 9 It can be reasoned then that lasers should be a reliable way of measuring height, proving to be accurate and easy to use. Currently, stadiometers are the standard way of measuring height. For the study a laser tool was created to measure the volunteers' heights. Volunteers were recruited from a total of four various public sites in different cities. Participants were categorized into three groups, children (ages 2-12), adolescents (13-18), and adults (19+). A total of 128 participants were measured. Results showed a strong positive correlation between measurements of the stadiometer and the laser (figure 3). While there were limitations to this study, results show that a laser may be a validated tool to measure height accurately
ContributorsGarcia-Turner, Vanessa Marie (Author) / Mayol-Kreiser, Sandra (Thesis director) / Johnston, Carol (Committee member) / Barrett, The Honors College (Contributor) / School of Nutrition and Health Promotion (Contributor) / Department of Psychology (Contributor)
Created2014-05
Description
Cyber threats are growing in number and sophistication making it important to continually study and improve all dimensions of digital forensics. Teamwork in forensic analysis has been overlooked in systems even though forensics relies on collaboration. Forensic analysis lacks a system that is flexible and available on different electronic devices which are being used and incorporated into everyday life. For instance, cellphones or tablets that are easy to bring on-the-go to sites where the first steps of forensic analysis is done. Due to the present day conversion to online accessibility, most electronic devices connect to the internet. Squeegee is a proof of concept that forensic analysis can be done on the web. The forensic analysis expansion to the web opens many doors to collaboration and accessibility.
ContributorsJuntiff, Samantha Maria (Author) / Ahn, Gail-Joon (Thesis director) / Kashiwagi, Jacob (Committee member) / Barrett, The Honors College (Contributor) / Computer Science and Engineering Program (Contributor)
Created2015-05
Description
I, Christopher Negrich, am the sole author of this paper, but the tools described were designed in collaboration with Andrew Hoetker. ConstrictR (constrictor) and ConstrictPy are an R package and python tool designed together. ConstrictPy implements the functions and methods defined in ConstrictR and applies data handling, data parsing, input/output (I/O), and a user interface to increase usability. ConstrictR implements a variety of common data analysis methods used for statistical and subnetwork analysis. The majority of these methods are inspired by Lionel Guidi's 2016 paper, Plankton networks driving carbon export in the oligotrophic ocean. Additional methods were added to expand functionality, usability, and applicability to different areas of data science. Both ConstrictR and ConstrictPy are currently publicly available and usable, however, they are both ongoing projects. ConstrictR is available at github.com/cnegrich and ConstrictPy is available at github.com/ahoetker. Currently, ConstrictR has implemented functions for descriptive statistics, correlation, covariance, rank, sparsity, and weighted correlation network analysis with clustering, centrality, profiling, error handling, and data parsing methods to be released soon. ConstrictPy has fully implemented and integrated the features in ConstrictR as well as created functions for I/O and conversion between pandas and R data frames with a full feature user interface to be released soon. Both ConstrictR and ConstrictPy are designed to work with minimal dependencies and maximum available information on the algorithms implemented. As a result, ConstrictR is only dependent on base R (v3.4.4) functions with no libraries imported. ConstrictPy is dependent upon only pandas, Rpy2, and ConstrictR. This was done to increase longevity and independence of these tools. Additionally, all mathematical information is documented alongside the code, increasing the available information on how these tools function. Although neither tool is in its final version, this paper documents the code, mathematics, and instructions for use, in addition to plans for future work, for of the current versions of ConstrictR (v0.0.1) and ConstrictPy (v0.0.1).
ContributorsNegrich, Christopher Alec (Author) / Can, Huansheng (Thesis director) / Hansford, Dianne (Committee member) / School of Mathematical and Statistical Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
This paper introduces an excel tool created to improve the accuracy of electrical subcontracting prices for solar photovoltaic energy systems while also minimizing the time needed to create these price estimations. The need for improved precision, specifically during the early stages of a project, is examined and the paper also goes into detail about the components and pricing method that are incorporated into the excel tool. Lastly, the results of the price estimation tool are compared to real bids and recommendations are made for improvement to the tool.
ContributorsJohnson, Eric Allen (Author) / Fraser, Matthew (Thesis director) / Hjelmstad, Keith (Committee member) / Hughes, Jeff (Committee member) / Civil, Environmental and Sustainable Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Can a skill taught in a virtual environment be utilized in the physical world? This idea is explored by creating a Virtual Reality game for the HTC Vive to teach users how to play the drums. The game focuses on developing the user's muscle memory, improving the user's ability to play music as they hear it in their head, and refining the user's sense of rhythm. Several different features were included to achieve this such as a score, different levels, a demo feature, and a metronome. The game was tested for its ability to teach and for its overall enjoyability by using a small sample group. Most participants of the sample group noted that they felt as if their sense of rhythm and drumming skill level would improve by playing the game. Through the findings of this project, it can be concluded that while it should not be considered as a complete replacement for traditional instruction, a virtual environment can be successfully used as a learning aid and practicing tool.
ContributorsDinapoli, Allison (Co-author) / Tuznik, Richard (Co-author) / Kobayashi, Yoshihiro (Thesis director) / Nelson, Brian (Committee member) / Computer Science and Engineering Program (Contributor) / School of International Letters and Cultures (Contributor) / Computing and Informatics Program (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
Description
This document offers composers a contextual reference and pragmatic overview
of the modern marimba. This guide is not designed as an orchestration text, suggesting ways to write for the instrument, rather, it illustrates through examination of well-known solo and chamber works how selected composers have effectively written for the instrument.
A guide for basic notation and examples of successful notation are included, as well as the basics of performer techniques. Samples of problematic, sometimes impossible passages are included to show the instruments and its performers' current limitations. The construction of the marimba and how it is tuned, a guide to mallets, and all of the current established extended techniques is also included. The majority of the information comes from the citation of established research on the marimba, composers and performers, and the author’s own experiences.
The intention of this document is two fold: to give composers who are unfamiliar with marimba a resource to begin composing for the instrument effectively, and for those composers who are familiar with the marimba it is designed to spark their creativity in an efficient and effective manner. The ultimate goal of this document is to create compositional momentum for marimba solo and chamber works and grow the repertoire, which is still in its infancy.
of the modern marimba. This guide is not designed as an orchestration text, suggesting ways to write for the instrument, rather, it illustrates through examination of well-known solo and chamber works how selected composers have effectively written for the instrument.
A guide for basic notation and examples of successful notation are included, as well as the basics of performer techniques. Samples of problematic, sometimes impossible passages are included to show the instruments and its performers' current limitations. The construction of the marimba and how it is tuned, a guide to mallets, and all of the current established extended techniques is also included. The majority of the information comes from the citation of established research on the marimba, composers and performers, and the author’s own experiences.
The intention of this document is two fold: to give composers who are unfamiliar with marimba a resource to begin composing for the instrument effectively, and for those composers who are familiar with the marimba it is designed to spark their creativity in an efficient and effective manner. The ultimate goal of this document is to create compositional momentum for marimba solo and chamber works and grow the repertoire, which is still in its infancy.
ContributorsMillea, Joseph Henry (Author) / Smith, Jeffrey B. (Thesis advisor) / Rogers, Rodney (Committee member) / Swoboda, Deanna (Committee member) / Arizona State University (Publisher)
Created2015