Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Explosives detection"”.
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Intense laser matter interactions for explosives detection and tunable spectral blueshift
This dissertation investigates explosives detection and spectral shifts induced in metal surfaces by ultrafast laser pulses at intensities ranging from 1013 to 1014 W/cm2. These ~100 femtosecond (fs) pulses facilitate non-resonant vaporization of explosives, enabling non-contact sampling and …
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Effects of Tomographic Image Reconstruction Parameters on Explosives Detection System Performance
Made available in DSpace on 2017-07-06T18:48:43Z (GMT). No. of bitstreams: 3 Humm_Paul_G_MS.pdf: 34070228 bytes, checksum: 084e7a2e24c30d8b43aa4516cb3ee7ab (MD5) Humm_Paul_G_MS_ABS.pdf: 527604 bytes, checksum: cbb92c87a7fda510847333f867d45322 (MD5) license.txt: 4813 bytes, checksum: …
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Towards the development of an explosives detection system using Neutron Resonance Radiography
Detection of conventional explosives remains a challenge to air security, as indicated by recent reports detailing lapses in security screening and new requirements that mandate screening 100% of checked luggage. Neutron Resonance Radiography (NRR) has been under investigation as a supplement to …
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Developing an Automated Explosives Detection Prototype Based on the AS&E 101ZZ System
… multi-energy x-ray prototype for automated explosives detection. The system is based on the American Science and Engineering model 101ZZ x-ray system. The 101ZZ unit received was an early model and lacked documentation of the many specialized electronic components. X-ray image quality was …
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The Thermomechanical Response of Composite Energetic Materials Under High- and Low-frequency Mechanical Excitations
… would be highly valuable to currently-existing explosives detection technologies, due to the associated increase in vapor pressure and thus concentration of detectable vapors. In this work, the thermomechanics of plastic-bonded explosives, propellants, and surrogates thereof are investigated due …
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Synthesis and characterization of nanoparticle suspensions: Towards quantitative surface-enhanced Raman spectroscopic sensing
… and in vivo biological sensing to chemical and explosives detection. In this thesis, we explore the design and characterization of suspensions of nanoparticles prior to their use for SERS-based molecular sensing. A major problem in SERS-based measurements is that the signals are often not …
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An Operations Research approach to aviation security
… attack. Next, we discuss whether proposed explosives detection policies for cargo, airmail and checked luggage carried on passenger aircraft are cost-effective.
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Doppler-Broadening of Light Nuclei Gamma-Ray Spectra
… material interrogation are used to locate hidden explosives and thwart terrorism attempts. In one such method materials are bombarded with neutrons which react with the nuclei of the atoms within causing a de-excitation process emitting a gamma-ray. The spectrum displayed by the collection of …
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Molecules and materials for the optical detection of explosives and toxic chemicals
… the highly sensitive and selective vapor-phase detection of both explosives and highly toxic chemicals, including chemical warfare agents. There are varieties of analyte targets, however, that remain challenging for detection by these methods. Research towards improving this technology has …
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Electrochemical techniques for detection of Tnt and other explosives using disposable screen-printed carbon electrodes
Nitroaromatic and nitramine explosives have been found in the soil and water from many government military bases due to improper storage, weapons testing and production. Run-off from contaminated soil and water can enter underground water and potentially contaminate drinking water for near-by …
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Field threshold measures for canine olfaction
… the development of new, portable, and effective detection technology for toxic waste sites a necessity. Current methods are expensive, cumbersome, and often only marginally effective. This project was designed as a first step in a programmatic approach to explore the feasibility of using dogs to …
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Nanoporous Silicon in Gas Preconcentration and Sensing
… concentrations, making accurate and selective detection difficult. This work responds to the increasing demand for real-time, online, rapid and location-specific gas sensing by small, low-cost and portable devices. In particular, this research focusses on improving sensitivity and/or …
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Volatile Organic Compound Detection And Disease Diagnostics Using Dna-Functionalized Carbon Nanotube Sensor Arrays
… applications such as pollution monitoring and explosives detection in a warzone. A series of experiments was conducted to evaluate DNA-NT sensitivity, specificity, and longevity using mixtures of 2,6-dinitrotoluene (DNT) and dimethyl methylphosphonate (DMMP) to simulate complex VOC …
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On the use of mechanical and acoustical excitations for selective heat generation in polymer-bonded energetic materials
… settings, there is a pressing need for improved explosives detection technologies suitable for trace vapor detection. In light of the strong dependence of vapor pressure on temperature, trace vapor detection capabilities may be enhanced by selectively heating target materials by external …
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Methods for optimization of the signature-based radiation scanning approach for detection of nitrogen-rich explosives
… can be used to rapidly detect nitrogen-rich explosives at standoff distances. This technique uses a template-matching procedure that produces a figure-of-merit (FOM) whose value is used to distinguish between inert and explosive materials. The present study develops a tiered-filter …
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The Utility of X-Ray Dual-Energy Transmission and Scatter Technologies for Illicit Material Detection
… is particularly important for detecting plastic explosives, where object shape information cannot be used. X-ray devices are relatively inexpensive compared to many other detection technologies. X-ray technology is considered as the technology for detecting illicit materials. Using x-ray …