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.
Results
Showing 1 to 20 of 25 for “"HMX"”.
-
Optical spectroscopy of HMX reaction regimes
… visible light emission from multiple granular HMX reactions has been completed. New techniques for measuring the reaction properties were devised, both directly and indirectly from the results gained from using optical spectroscopy. Two different impact initiated deflagration reactions were …
-
Three dimensional vibrational spectroscopy and shock initiation of hmx
… to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX …
-
Tracking hot spot dynamics in solid state explosives with shock compression microscopy
… In cyclotetramethylene-tetranitramine (HMX) single crystals (HMX-SC), hot spots consistently formed on the crystal facets and corners. Whereas, on highly defective HMX grains, hot spots were seen to emanate from internal voids first. By shocking hundreds of HMX-SC at increasing shock …
-
Shock initiation of explosives under the microscope
… octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) samples which were hand packed into wells containing ~20 μg of explosive material. This low density sample produced hot spots which were ~7000 K, a temperature which was incredibly high by all expectations. We determined that the high …
-
Nonlinear Dynamic Combustion of Energetic Solids
… what has been suggested recently for NC/NG and HMX.
-
Near-infrared emission spectroscopy of explosive breakout
… Explosives 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 …
-
Influencia de humedad y temperatura sobre la fertilidad de vacas holstein, en la Península de Chiltepe
… de las variables estudiadas, a excepción de HMX Humedad Relativa Máxima del día de inseminación) cuya influencia parece ser muy débil. De acuerdo con las Pruebas de Independencia de Chi cuadrado las variables más relacionadas con la fertilidad de las vacas son HDA (Humedad Relativa Promedio …
-
Two-Dimensional Modeling of AP/HTPB Utilizing a Vorticity Formulation and One-Dimensional Modeling of AP and ADN
… previously applied to combustion models of HMX, RDX, GAP, GAP/RDX, GAP/HMX, NG, BTTN, TMETN, GAP/BTTN, and GAP/RDX/BTTN. The universal kinetic mechanism has been expanded to include chlorine reactions, thus allowing the numerical modeling of AP. This is seen as a further step in developing a …
-
Examination of the small scale slow cookoff behavior of a cast modified double base propellant
… in a sealed blast chamber and was compared to HMX and RDX detonations. Morphological behavior was examined using X-ray computed tomography to provide qualitative information on void formation due to gradual heating.
-
Random Packs and Their Use in Modeling High Speed Porous Flow
… more relevant in many complex materials such as HMX and pressed gun propellants. We have obtained results for dense random packs of various convex shapes such as gel capsules, cylinders, and polyhedra. As an example application, we present preliminary results of numerical experiments of …
-
A numerical study of shock-induced hot spot generation in energetic material
… a series of test cases for RDX (C3H6N6O6) and HMX (C4H8N8O8). The results shows that viscoplastic heating is an effective mechanism in the ignition of shocked energetic materials. In addition, it is demonstrated that the material porosity and the initial pore size have strong influence on the …
-
Experimental investigation of optical and electrical properties of various explosive fireballs
… generation. Explosives such as TNT, RDX, HMX, Comp B, Tritonal, and Nitromethane were utilized to assess the effects of varied carbon content on each of the aforementioned properties. Furthermore, the ambient pressure was manipulated to alter kinetics and simulate blast scaling effects. …
-
Characterization framework to develop ball-milled thermites as additives to polymer-bound explosives
… wt.% ARM composites were added as additives to HMX-based PBX and compared against aluminized PBX. Micron-sized (7.07 × 10-11 m3) cylindrical sample wells were shocked by flyers at 4 km/s, and their reaction behavior was characterized by a 32-channel nanosecond pyrometer. These diagnostics …
-
Experimental analysis and modeling of transient dissolution of RDX through mass transfer processes
… CompB is made up of three parts: 54% RDX, 6% HMX and 40% TNT. A numerical simulation was employed to model the overall solute transport equation. The solute transport equation takes into account advection, dispersion, sorption, degradation, mobile-immobile sorption, and a mass transfer source …
-
Phytoforensics on energetics: novel plant tissue measure approach and modeling
… phytoforensic approach was validated on RDX and HMX by both experimental results and simulated results as strong correlation were achieved between plant concentration and exposure concentration"--Abstract, page iii.
-
Dissecting the Development and Function of C. elegans Glia with Mutations of the mls-2 and vab-3 Genes
… and dorsal-restricted roles for the mls-2/Nkx/Hmx and vab-3/Pax6/Pax7 genes, respectively, in differentiation and expression of the genes hlh-17/Olig and ptr-10/Patched-related. Similar pathways regulate oligodendrocyte generation in vertebrate spinal cords. Using mls-2 and vab-3 mutants, as …
-
Shock compression and flash-heating of molecular adsorbates on the picosecond time scale
… reactions in molecular explosives such as δ-HMX: a necessary study for the development of safer and more effective energetic materials.
-
Multispectral optical depth measurements in post-detonation high explosive 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 PETN …
-
Modeling and simulation of multi-component condensed phase combustion at the meso-scale
… to an RMD simulation of deflagration in a HMX nano-slab on Chapter 5.
Page 1 of 2