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 12 of 12 for “"PETN"”.
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Determining the Reaction Zone Length in Shock Initiated PETN
Pentaerythritol tetranitrate (PETN) is a secondary explosive used in electrical detonators in the form of a pressed powder. The reaction zone length of PETN is smaller than that of most other explosives, therefore there is a lack of data due to insufficient resolution of existing methods. …
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Design and synthesis of organic chromophores for imaging, lithography and organic electronics
… ion equivalent to the high explosives RDX and PETN upon irradiation at 313 nm in degassed acetonitrile solutions. Mechanistic photophysical studies indicated that the photoreduction of RDX proceeded via a two-step electron-hydrogen atom transfer reaction, whereas PETN photoreduction proceeded …
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Multispectral optical depth measurements in post-detonation high explosive fireballs
… fireballs from five different high explosives. PETN, HMX-based PBXN-5, RDX, an 80% RDX/20% aluminum mixture, and PETN-based Primasheet 1000 explosives were detonated in a 2.18L explosive test chamber. Charges were 125mg or 250mg explosive output pellets, each detonated by an 80mg low density …
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Periplasmic Modification of the 1-Phosphate Group of Lipid A in Gram-Negative Bacteria.
… a lipid A phosphatase and a phosphoethanolamine (pEtN) transferase, involved in modifying the 1-position of <em>H. pylori</em> lipid A. <em>H. pylori</em> lipid A contains a pEtN unit directly linked to the 1-position of the disaccharide backbone. This is in contrast to the pEtN units found in …
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Near-infrared emission spectroscopy of explosive breakout
… tested include RDX, Composition B, HMX, and PETN, along with RP1 and RP80 detonators in air and nitrogen environments. The first 20 microseconds after detonation were examined using a combination of a rotating filter disk and shutter to gate the exposure after the detonation. The spectral …
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Shock initiation of explosives under the microscope
… explosives) we substituted HMX for PETN, an explosive known to have extremely fast chemistry. We used these samples to determine that the hot spot temperatures observed in the low density HMX were due to the in-situ gas generation from decomposition of explosive into micron-scale …
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Vibrational Kerr spectroscopy
… (RDX), and pentaerythritrol tetranitrate (PETN). From the infrared absorption spectra, the characteristic N02 symmetric and asymmetric stretch bands of the explosives were identified as spectral targets for the vibrational Kerr effect. The vibrational Kerr spectra of fluoroform and …
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Investigating detonation fronts in small explosive charges using a wave shaper
… fabricated in-house using pressed PBXN-5 and PETN and assembled with machined wave shapers. There is a strong correlation between the Autodyn model and the experiment for larger wave shapers (charge size 1” diameter) and reasonable correlation for the mini wave shapers (charge size 8 mm …
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Development of an LCMS Analytical Method with Applicability to Determination of Trace Level Explosives in Environmental Waters
… 1,3,5-TNB, 2,4,6-TNT, 2,4-DNT, RDX, HMX and PETN. A survey of the published articles and writings provides a foundation to the thesis and gives additional background on the researched topic. Some of the proposed methods in the literature have weaknesses, such as low resolution, low …
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Measuring the abundance, diversity and overlap of Antimicrobial Resistance genes associated with humans, livestock and the environment in low- and middle-income country settings
… dependent on LPS configuration (L-Ara4N-LPS vs pEtN-LPS). Finally, the genetic determinants of AMR and other stress regulators of K. pneumoniae exhibited dose-dependent gene expression in response to meropenem, ciprofloxacin and tigecycline exposure. A good concordance was observed between …
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Energy transfer and localization in molecular crystals
… THz spectra for planar slabs made of PETN and ammonium nitrate. We discuss third-harmonic generation and polarization-conversion processes in such materials. These observed far-field spectral features of the reflected or transmitted light may serve as an alternative tool for stand-off …
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Detonation shock and ignition dynamics in condensed phase explosives
… of ignition events in solid PBX9501 and in PETN powders. We compare our results with numerical calculations of detonation shock dynamics and direct numerical simulations. We find that the time it takes an ignition wave to become quasi-steady is short, explaining why the quasi-steady relation …