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LASER INDUCED BREAKDOWN SPECTROSCOPY FOR DETECTION OF ORGANIC RESIDUES: IMPACT OF AMBIENT ATMOSPHERE AND LASER PARAMETERS
Title
LASER INDUCED BREAKDOWN SPECTROSCOPY FOR DETECTION OF ORGANIC RESIDUES: IMPACT OF AMBIENT ATMOSPHERE AND LASER PARAMETERS.
Creator
Brown, Christopher, Richardson, Martin, University of Central Florida
Abstract / Description
Laser Induced Breakdown Spectroscopy (LIBS) is showing great potential as an atomic analytical technique. With its ability to rapidly analyze all forms of matter, with little-to-no sample preparation, LIBS has many advantages over conventional atomic emission spectroscopy techniques. With the maturation of the technologies that make LIBS possible, there has been a growing movement to implement LIBS in portable analyzers for field applications. In particular, LIBS has long been considered the...
Show moreLaser Induced Breakdown Spectroscopy (LIBS) is showing great potential as an atomic analytical technique. With its ability to rapidly analyze all forms of matter, with little-to-no sample preparation, LIBS has many advantages over conventional atomic emission spectroscopy techniques. With the maturation of the technologies that make LIBS possible, there has been a growing movement to implement LIBS in portable analyzers for field applications. In particular, LIBS has long been considered the front-runner in the drive for stand-off detection of trace deposits of explosives. Thus there is a need for a better understanding of the relevant processes that are responsible for the LIBS signature and their relationships to the different system parameters that are helping to improve LIBS as a sensing technology. This study explores the use of LIBS as a method to detect random trace amounts of specific organic materials deposited on organic or non-metallic surfaces. This requirement forces the limitation of single-shot signal analysis. This study is both experimental and theoretical, with a sizeable component addressing data analysis using principal components analysis to reduce the dimensionality of the data, and quadratic discriminant analysis to classify the data. In addition, the alternative approach of 'target factor analysis' was employed to improve detection of organic residues on organic substrates. Finally, a new method of characterizing the laser-induced plasma of organics, which should lead to improved data collection and analysis, is introduced. The comparison between modeled and experimental measurements of plasma temperatures and electronic density is discussed in order to improve the present models of low-temperature laser induced plasmas.
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Date Issued
2011
Identifier
CFE0003708, ucf:48843
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0003708
Recruiting Followers for the Caliphate: A Narrative Analysis of Four Jihadist Magazines
Title
Recruiting Followers for the Caliphate: A Narrative Analysis of Four Jihadist Magazines.
Creator
Madrazo, Andrea, Matusitz, Jonathan, Malala, John, Sellnow, Timothy, University of Central Florida
Abstract / Description
This study identifies and compares the methods of recruitment used by three prime jihadist organizations through their online magazines. The successful recruitment efforts and growth as a threat by the Islamic State of Iraq and Sh?m (ISIS), Al-Qaeda, and Al-Shabaab are attributed, in part, to the widespread popularity and accessibility of Dabiq and Rumiyah (published by ISIS), Inspire (published by Al-Qaeda), and Gaidi Mtaani (published by Al-Shabaab). In order to best examine the techniques...
Show moreThis study identifies and compares the methods of recruitment used by three prime jihadist organizations through their online magazines. The successful recruitment efforts and growth as a threat by the Islamic State of Iraq and Sh?m (ISIS), Al-Qaeda, and Al-Shabaab are attributed, in part, to the widespread popularity and accessibility of Dabiq and Rumiyah (published by ISIS), Inspire (published by Al-Qaeda), and Gaidi Mtaani (published by Al-Shabaab). In order to best examine the techniques of persuasion and propaganda to recruit new followers, the theoretical approach of compliance-gaining theory and methodological approach of a narrative analysis are applied. The author analyzed a total of twelve magazine issues to compare how the four magazines use (1) imagery, (2) attrition, (3) intimidation, (4) propaganda, (5) spoiling, (6) outbidding, (7) incitement, and (8) recruitment. To validate each of these themes, the study applies an open-coding instrument to select each label based on specific dimensions. These findings reveal how the same purpose to achieve the Caliphate can be chosen on a similar path by these three different jihadist organizations. This path may take different turns at certain spots, but ultimately the road is based on the same historical context to justify the recruitment process. Overall, this study provides fresh descriptive insights on jihadist organizations' recruitment methods to gain new followers toward the achievement of the Caliphate (i.e., the global Islamic state). The sample reveals that the online jihadist magazines integrate all analyzed themes to portray their messages. The findings show certain issues implement specific themes more than others. Across the sample, the use of persuasion justified and encouraged violence. Persuasion is found in prideful examples of successful terrorist attacks and aftermath scenes of destruction. The distinct difference between the four online jihadist magazines is the persuasion of recruitment.
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Date Issued
2018
Identifier
CFE0007048, ucf:51984
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0007048
Factors Affecting Systems Engineering Rigor in Launch Vehicle Organizations
Title
Factors Affecting Systems Engineering Rigor in Launch Vehicle Organizations.
Creator
Gibson, Denton, Karwowski, Waldemar, Rabelo, Luis, Kotnour, Timothy, Kern, David, University of Central Florida
Abstract / Description
Systems engineering is a methodical multi-disciplinary approach to design, build, and operate complex systems. Launch vehicles are considered by many extremely complex systems that have greatly impacted where the systems engineering industry is today. Launch vehicles are used to transport payloads from the ground to a location in space. Satellites launched by launch vehicles can range from commercial communications to national security payloads. Satellite costs can range from a few million...
Show moreSystems engineering is a methodical multi-disciplinary approach to design, build, and operate complex systems. Launch vehicles are considered by many extremely complex systems that have greatly impacted where the systems engineering industry is today. Launch vehicles are used to transport payloads from the ground to a location in space. Satellites launched by launch vehicles can range from commercial communications to national security payloads. Satellite costs can range from a few million dollars to billions of dollars. Prior research suggests that lack of systems engineering rigor as one of the leading contributors to launch vehicle failures. A launch vehicle failure could have economic, societal, scientific, and national security impacts. This is why it is critical to understand the factors that affect systems engineering rigor in U.S. launch vehicle organizations.The current research examined organizational factors that influence systems engineering rigor in launch vehicle organizations. This study examined the effects of the factors of systems engineering culture and systems engineering support on systems engineering rigor. Particularly, the effects of top management support, organizational commitment, systems engineering support, and value of systems engineering were examined. This research study also analyzed the mediating role of systems engineering support between top management support and systems engineering rigor, as well as between organizational commitment and systems engineering rigor. A quantitative approach was used for this. Data for the study was collected via survey instrument. A total of 203 people in various systems engineering roles in launch vehicle organizations throughout the United States voluntarily participated. Each latent construct of the study was validated using confirmatory factor analysis (CFA). Structural equation modeling (SEM) was used to examine the relationships between the variables of the study. The IBM SPSS Amos 25 software was used to analyze the CFA and SEM.
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Date Issued
2019
Identifier
CFE0007806, ucf:52348
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0007806