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Development of a Simplified Fracture Toughness Tool for Polymers

Description: This thesis presents research toward the development of a simple inexpensive fracture toughness tool for polymeric materials. Experiments were conducted to test the specimen configuration and the fracture toughness tool against an established ASTM standard for polymer fracture toughness, D5045, and a commonly used four-point bend method. The materials used in this study were polycarbonate and high density polyethylene. Reductions in both the production time and the variability resulting from th… more
Date: August 1997
Creator: Marnock, Patrick J. (Patrick Joseph)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

An Experimental Investigation on the Effects of Web-Based Instruction/Training on Cognitive and Psychomotor Learning

Description: The purpose of this study was to investigate the effects of web-based instruction (WBI) on cognitive and psychomotor learning. The subjects of the study received two types of instructional methods, WBI (experimental group) and traditional classroom instruction (control group). Each group received 30 minutes of instruction on "Soldering a Circuit Board." The researcher chose this content subject because it involved both cognitive and psychomotor objectives, which suited the purpose of this study… more
Date: August 2000
Creator: Alzafiri, Fayiz M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Using Motor Electrical Signature Analysis to Determine the Mechanical Condition of Vane-Axial Fans

Description: The purpose of this research was a proof of concept using a fan motor stator as transducer to monitor motor rotor and attached axial fan for mechanical motion. The proof was to determine whether bearing faults and fan imbalances could be detected in vane-axial fans using Motor Electrical Signature Analysis (MESA). The data was statistically analyzed to determine if the MESA systems could distinguish between baseline conditions and discrete fault frequencies for the three test conditions: beari… more
Date: August 2002
Creator: Doan, Donald Scott
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

University of North Texas Budget: 2003-2004, Volume 1

Description: First part of the budget for the University of North Texas regarding funds in the 2003-2004 fiscal year. This volume contains a breakdown of expected profits and expenses for general university and administrative departments as well as individual colleges and departments. Index is in Volume II, starting on page 1175.
Date: August 15, 2003
Creator: University of North Texas
Item Type: Refine your search to only Book
Partner: UNT Libraries Special Collections
open access

Analysis of design tradeoffs for diplay case evaporators

Description: A model for simulating a display case evaporator under frosting conditions has been developed, using a quasi-steady and finite-volume approach and a Newton-Raphson based solution algorithm. It is capable of simulating evaporators with multiple modules having different geometries, e.g. tube and fin thicknesses and pitch. The model was validated against data taken at two-minute intervals from a well-instrumented medium-temperature vertical display case, for two evaporators having very different c… more
Date: August 11, 2004
Creator: Bullard, CLARK
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FEM of nanoindentation on micro- and nanocrystalline Ni: Analysis of factors affecting hardness and modulus values.

Description: Nanoindentation is a widely used technique to measure the mechanical properties of films with thickness ranging from nanometers to micrometers. A much better understanding of the contact mechanics is obtained mostly through finite element modeling. The experiments were modeled using the software package Nano SP1 that is based on COSMOSM™ (Structural Research & Analysis Corp, www.cosmosm.com), a finite element code. The fundamental material properties affecting pile-up are the ratio of the effec… more
Date: August 2005
Creator: Pothapragada, Raja Mahesh
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Characterization of Boron Nitride Thin Films on Silicon (100) Wafer.

Description: Cubic boron nitride (cBN) thin films offer attractive mechanical and electrical properties. The synthesis of cBN films have been deposited using both physical and chemical vapor deposition methods, which generate internal residual, stresses that result in delamination of the film from substrates. Boron nitride films were deposited using electron beam evaporation without bias voltage and nitrogen bombardment (to reduce stresses) were characterize using FTIR, XRD, SEM, EDS, TEM, and AFM technique… more
Date: August 2007
Creator: Maranon, Walter
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Factors influencing horizontal cracking in continuously reinforced concrete pavements (CRCP).

Description: This research presents the results on an experimental investigation to identify the significant factors influencing horizontal cracking in continuously reinforced concrete pavements (CRCP). An in-depth analysis of the microstructure, morphological characteristics of the interfacial transition zone (ITZ) and the observation of cracking using the environmental scanning electron microscope (ESEM) was done. Characterization of oxides using Fourier transform infrared spectroscopy (FTIR) and electron… more
Date: August 2008
Creator: Sudoi, Elias K.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Verilog 8051 Soft Core for FPGA Applications

Description: The objective of this thesis was to develop an 8051 microcontroller soft core in the Verilog hardware description language (HDL). Each functional unit of the 8051 microcontroller was developed as a separate module, and tested for functionality using the open-source VHDL Dalton model as benchmark. These modules were then integrated to operate as concurrent processes in the 8051 soft core. The Verilog 8051 soft core was then synthesized in Quartus® II simulation and synthesis environment (Altera… more
Date: August 2009
Creator: Rangoonwala, Sakina
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Cold-Formed Steel Bolted Connections Using Oversized and Slotted Holes without Washers

Description: In cold-formed steel (CFS) construction, bolted connections without washers for either oversized or slotted holes may significantly expedite the installation process and lower the cost. However, the North American Specification (AISI S100, 2007) for the Design of Cold-Formed Steel Structural Members requires washers to be installed in bolted connections with oversized or slotted holes. A research project (Phase 1) sponsored by American Iron and Steel Institute (AISI) was recently completed at t… more
Date: August 2010
Creator: Xu, Ke
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Electronic Sound Analysis with Hardware System and Remote Internet Display

Description: Currently, standards from government agencies such as the National Institute for Occupation Safety and Health exist to aid in safeguarding individuals’ capacity for hearing, but only in factory settings in which large machines often produce loud levels of sound. Neglecting the fact that these preventative measures are only in place in the most limited of settings, no system currently exists to observe and report sound exposure levels in a manner timely or easily recognizable enough to adequatel… more
Date: August 2010
Creator: McCord, Cameron Forrest
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Nominal Shear Strength and Seismic Detailing of Cold-formed Steel Shear Walls using Steel Sheet Sheathing

Description: In this research, monotonic and cyclic tests on cold-formed steel shear walls sheathed with steel sheets on one side were conducted to (1) verify the published nominal shear strength for 18-mil and 27-mil steel sheets; and (2) investigate the behavior of 6-ft. wide shear walls with multiple steel sheets. In objective 1: this research confirms the discrepancy existed in the published nominal strength of 27-mil sheets discovered by the previous project and verified the published nominal strength … more
Date: August 2010
Creator: Chen, Yujie
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

A Real-Time Electronic Sound Analysis System with Graphical User Interface

Description: Noise-induced hearing loss is a serious problem common to musical environments. Current dosimetry technology is primarily designed for industrial environments and not suited for musical settings. At present, there are no government regulations that apply to the educational music environment as it relates to monitoring and prevention of hearing loss. Also, no system exists than can serve as a proactive tool in observation and reporting of sound exposure levels with the goal of hearing conservati… more
Date: August 2011
Creator: Brgulja, Amir
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Drive Level Dependence of Advanced Piezoelectric Resonators

Description: Resonators are one of the most important parts of electronic products. They provide a stable reference frequency to ensure the operation of these products. Recently, the electronic products have the trend of miniaturization, which rendered the size reduction of the resonators as well [1]. Better design of the resonators relies on a better understanding of the crystals' nonlinear behavior [2]. The nonlinearities affect the quality factor and acoustic behavior of MEMS (Micro-Electro-Mechanical-Sy… more
Date: August 2012
Creator: Xie, Yuan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Effects of Minimum Quantity Lubrication (Mql) on Tool Life in Drilling Aisi 1018 Steel

Description: It has been reported that minimum quantity lubrication (MQL) provides better tool life compared to flood cooling under some drilling conditions. In this study, I evaluate the performance of uncoated HSS twist drill when machining AISI 1018 steel using a newly developed lubricant designed for MQL (EQO-Kut 718 by QualiChem Inc.). A randomized factorial design was used in the experiment. The results show that a tool life of 1110 holes with a corresponding flank wear of 0.058 mm was realized.
Date: August 2012
Creator: Maru, Tejas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Mist Characterization in Drilling 1018 Steel

Description: Minimum quantity lubrication replaces the traditional method of flood cooling with small amounts of high-efficient lubrication. Limited studies have been performed to determine the characteristics of mist produced during MQL. This study investigated the mist concentration levels produced while drilling 1018 steel using a vegetable based lubricant. ANOVA was performed to determine whether speed and feed rates or their interactions have a significant effect on mist concentration levels and partic… more
Date: August 2012
Creator: Cole, Ian
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Wireless In-home Ecg Monitoring System with Remote Access

Description: The thesis work details the design and testing of a wireless electrocardiogram (ECG) system. This system includes a wireless ECG device, as well as software packages to visually display the waveform locally on a computer and remotely on a web page. The remote viewing capability also extends to using an Android phone application. The purpose of the system is to serve as a means for a doctor or physician to check up on a patient away from a hospital setting. This system allows for a patient to be… more
Date: August 2012
Creator: Porter, Logan
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

[Commencement Program for University of North Texas, August 10-11, 2012]

Description: Commencement program for the summer 2012 graduating class of the University of North Texas, held in the UNT Coliseum on Friday and Saturday, August 10-11, 2012. The program contains the order of service and a list of graduates for the baccalaureate, master's, doctoral degrees.
Date: 2012-08-10/2012-08-11
Creator: University of North Texas
Item Type: Refine your search to only Pamphlet
Partner: UNT Libraries Special Collections
captions transcript

[Doctoral and Master's Summer 2013 commencement ceremony]

Description: Video recording of the Doctoral and Master's Summer 2013 commencement ceremony held at the Coliseum on Friday, August 9 at 3 p.m. The ceremony includes remarks by UNT President Dr. V. Lane Rawlins, Provost and Vice President for Academic Affairs Dr. Warren Berggren, System Vice Chancellor and General Counsel Nancy S. Footer, System Regent Don C. Potts, Vice President of Finance and Administration for the Graduate Student Council Anastasia Garcia, and Dean of the Toulouse Graduate School Mark Wa… more
Date: August 9, 2013
Duration: 2 hours 5 minutes 40 seconds
Creator: University of North Texas.
Item Type: Refine your search to only Video
Location: 33.208630 -97.154106
Partner: UNT Libraries Special Collections
captions transcript

[College of Business, College of Education, College of Engineering and College of Information Fall 2013 commencement ceremony]

Description: Video recording of the College of Business, College of Education, College of Engineering and College of Information Fall 2013 commencement ceremony held at the Coliseum on Saturday, August 10 at 1 p.m. The ceremony includes remarks by UNT President Dr. V. Lane Rawlins, Provost and Vice President for Academic Affairs Dr. Warren Berggren, System Vice Chancellor for Administration Allen Clemson, Vice Chair of the Faculty Senate Francisco Guzman, Chair of the Staff Senate Danielle Champagne, Presid… more
Date: August 10, 2013
Duration: 2 hours 6 minutes 39 seconds
Creator: University of North Texas.
Item Type: Refine your search to only Video
Location: 33.208630 -97.154106
Partner: UNT Libraries Special Collections
open access

Control and Automation of a Heat Shrink Tubing Process

Description: Heat shrink tubing is used to insulate wire conductors, protect wires, and to create cable entry seals in wire harnessing industries. Performing this sensitive process manually is time consuming, the results are strongly dependent on the operator’s expertise, and the process presents safety concerns. Alternatively, automating the process minimizes the operators’ direct interaction, decreases the production cost over the long term, and improves quantitative and qualitative production indicators … more
Date: August 2014
Creator: Yousefi Darani, Shahrokh
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Use of Optical Metrology in Active Positioning of a Lens

Description: Precisely positioned optical lenses are currently required for many highly repetitive mechanics and applications. Thus the need for micron-scale repetition between opto-mechanical units is evident, especially in industrial manufacturing and medical breakthroughs. In this thesis, a novel optical metrology system is proposed, designed, and built whose purpose is to precisely locate the center of a mechanical fixture and then to assemble a plano-convex optical lens into the located position of the… more
Date: August 2014
Creator: Ji, Zheng
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
captions transcript

[College of Arts and Sciences, College of Engineering, and College of Merchandising, Hospitality and Tourism Summer 2014 commencement ceremony]

Description: Video recording of the College of Arts and Sciences, College of Engineering, and College of Merchandising, Hospitality and Tourism Summer 2014 commencement ceremony held at the Coliseum on Saturday, August 9 at 1 p.m. The ceremony includes remarks by UNT President Dr. Neal Smatresk, Vice Chancellor for Academic Affairs and Student Success Dr. Rosemary R. Haggett, System Regent Glen Whitley, President of the Student Government Association Troy Elliott, Dean of the Honors College Dr. Gloria C. Co… more
Date: August 9, 2014
Duration: 1 hour 12 minutes 56 seconds
Creator: University of North Texas.
Item Type: Refine your search to only Video
Location: 33.208630 -97.154106
Partner: UNT Libraries Special Collections
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