The explosive power or strength of an energetic material shows its capacity for doing useful work. This work reviews recent developments for prediction of power of energetic compounds. A new user-friendly computer cod...
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The explosive power or strength of an energetic material shows its capacity for doing useful work. This work reviews recent developments for prediction of power of energetic compounds. A new user-friendly computer code is also introduced to predict the relative power of a desired energetic compound as compared to 2,4,6-trinitrotoluene (TNT). It is based on the best available methods, which can be used for different types of energetic compounds including nitroaromatics, nitroaliphatics, nitramines, and nitrate esters. The computed relative powers are consistent with the measured data for some new materials containing complex molecular structures.
M subshell fluorescence yield (omega(Mi), i=1-5) and Coster-Kronig yield (f(Mij), i=1-4, j=2-5) values have been generated for elements with Z, 57 56, the interpolation of non-relativistic data of McGuire [Phys. Rev....
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M subshell fluorescence yield (omega(Mi), i=1-5) and Coster-Kronig yield (f(Mij), i=1-4, j=2-5) values have been generated for elements with Z, 57 <= Z <= 90. Keeping in view the importance of omega(Mi) and fmu for M X-ray productions in the region Z > 56, the interpolation of non-relativistic data of McGuire [Phys. Rev. A 1972;5:1043-7] in the region Z=57-90 as well as relativistic data of Chen et al. [Phys. Rev. A 1980;21:449-53 and 1983;27:2989-94] in the region Z=67-90 was attempted. The agreement between the generated data and the actual ones supported the adopted procedure. Subsequently, a computer software code MFCKYLD was developed to generate the yield values on computer terminal or in file for both non-relativistic and relativistic data just by entering the atomic number Z of the element through keyboard or file. The precision of present procedure that relies on the deviation of fitted values from the actual ones was found far better than the earlier fitted data. (C) 2013 Elsevier Ltd. All rights reserved.
RADIA is a three-dimensional magnetostatics computer code optimized for the design of undulators and wigglers. It solves boundary magnetostatics problems with magnetized and current-carrying volumes using the boundary...
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RADIA is a three-dimensional magnetostatics computer code optimized for the design of undulators and wigglers. It solves boundary magnetostatics problems with magnetized and current-carrying volumes using the boundary integral approach. The magnetized volumes can be arbitrary polyhedrons with non-linear (iron) or linear anisotropic (permanent magnet) characteristics. The current-carrying elements can be straight or curved blocks with rectangular cross sections. Boundary conditions are simulated by the technique of mirroring. Analytical formulae used for the computation of the field produced by a magnetized volume of a polyhedron shape are detailed. The RADIA code is written in object-oriented C++ and interfaced to Mathematica [Mathematica is a registered trademark of Wolfram Research, Inc.]. The code outperforms currently available finite-element packages with respect to the CPU time of the solver and accuracy of the field integral estimations. An application of the code to the case of a wedge-pole undulator is presented.
computer codes for irradiation behavior analysis of a fuel pin and a fuel pin bundle and for coolant thermal-hydraulic analysis were coupled into an integrated code system. In the system, each code provides data requi...
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computer codes for irradiation behavior analysis of a fuel pin and a fuel pin bundle and for coolant thermal-hydraulic analysis were coupled into an integrated code system. In the system, each code provides data required by other codes, and the analyzed results are shared among them. The system allows for the synthesizing of analyses of thermal, chemical, and mechanical behaviors in a fuel subassembly under irradiation. A test analysis was made for a fuel subassembly containing a mixed oxide fuel pin bundle irradiated in a fast reactor. The results of the analysis were presented with transverse cross-sectional images of the fuel subassembly and three-dimensional images of a fuel pin and fuel pin bundle models. For detailed evaluation, various irradiation behaviors of all fuel pins in the subassembly were analyzed and correlated with irradiation conditions.
Average M shell fluorescence yield (pi(M)) have been calculated from non-relativistic data of McGuire (Phys Rev A 1972;5:1043-47) in the region Z=60-90 and relativistic data of Chen, Crasemann and Mark (Phys Rev A 198...
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Average M shell fluorescence yield (pi(M)) have been calculated from non-relativistic data of McGuire (Phys Rev A 1972;5:1043-47) in the region Z=60-90 and relativistic data of Chen, Crasemann and Mark (Phys Rev A 1980;21:449-53) and (Phys Rev A 1983;27:2989-94) in the region Z=70-90 on M sub-shell fluorescence yield (omega(M) i=1-5) and Coster-Kronig yield (f(Mij), i=1-4, j= 2-5) procured from our earlier work (a computer software code MFCKYLD) using Scofield's data (Lawrence Livermore Laboratory Report UCRL 51326;1973) on M sub-shell photo-ionization cross-sections. Subsequently, a computer software code AMSFYLD was developed to generate the yield values on computer terminal or in file for both non-relativistic and relativistic data just by entering the atomic number Z of the element through keyboard or file. The values were compared with available theoretical and experimental values in the literature. The agreement between the present data and the other supports the present values. (C) 2014 Elsevier Ltd. All rights reserved.
The prediction of phase change properties of energetic materials is important for the assessment of hazardous energetic materials. A novel user-friendly computer code, written in Visual Basic, is introduced to predict...
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The prediction of phase change properties of energetic materials is important for the assessment of hazardous energetic materials. A novel user-friendly computer code, written in Visual Basic, is introduced to predict the melting point and the enthalpy of fusion of energetic materials by only using their molecular structure parameters. It can be used for different types of energetic compounds including polynitro arenes, polynitro heteroarenes, acyclic and cyclic nitramines, nitrate esters, and nitroaliphatic. The predicted results were compared with several of the best available methods, which confirmed the higher reliability of the new computer code for some new and well-known energetic compounds with complex molecular structures. This code can be used for designing of energetic compounds with desirable phase change properties.
A computer software named T/BEST, Technology Benefit Estimator, has been developed to provide a formal method to assess advanced aerospace technologies and quantify the benefit contributions for prioritization. An ope...
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A computer software named T/BEST, Technology Benefit Estimator, has been developed to provide a formal method to assess advanced aerospace technologies and quantify the benefit contributions for prioritization. An open-ended, modular approach is used to allow for upgrade and insertion of advanced technology modules. T/BEST's software framework, beginner-to-expert operation, interface architecture and key analysis modules are discussed. fn this paper, selected features and applications of T/BEST are demonstrated. Sample cases pertaining to structural analysis of fan and compressor blades made of titanium and composite are presented. The performance of hot and cold composite fan blades is also discussed. The cost required to manufacture titanium and composite fan blades is estimated. (C) 1997 Elsevier Science Limited.
This paper reviews some recent developments for prediction of sublimation energy and deflagration temperature of energetic materials, which are important for the assessment of hazardous properties of these types of co...
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This paper reviews some recent developments for prediction of sublimation energy and deflagration temperature of energetic materials, which are important for the assessment of hazardous properties of these types of compounds. A novel user-friendly computer code, written in Visual Basic, is introduced to predict sublimation energy and deflagration temperature of energetic materials through using only their molecular structure parameters. It can be used for different types of energetic compounds including nitroaliphatics, nitroaromatics, nitramines and nitrate esters. The predicted results were compared with experimental data for some new energetic compounds of different classes containing complex molecular structures, which confirm high reliability of this novel computer code.
The FACE computer code was developed to calculate postulated solvent fire behavior in the extraction process of a nuclear fuel reprocessing plant. The FACE code calculates temperature, pressure, and off-gas flow rate ...
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The FACE computer code was developed to calculate postulated solvent fire behavior in the extraction process of a nuclear fuel reprocessing plant. The FACE code calculates temperature, pressure, and off-gas flow rate by one- and two-dimensional thermofluid analyses. The code uses this information to evaluate the safety of the associated air ventilation system as demonstrated by its ability to confine the fire-generated radioactive particles by transport, deposition, and filtration of smoke. The mathematical models in FACE were verified by comparison of FACE calculations with the results of Japan Atomic Energy Research Institute fire demonstration tests simulating a hypothetical solvent fire accident in the extraction process.
Crystal density and enthalpy of formation of the condensed phase of energetic compounds are two important input parameters for the performance prediction in several computer codes for rapid hazard assessment of energe...
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Crystal density and enthalpy of formation of the condensed phase of energetic compounds are two important input parameters for the performance prediction in several computer codes for rapid hazard assessment of energetic materials. A novel easy-to-handle user-friendly computer code in Visual Basic is introduced to predict these parameters for various energetic compounds including nitroaliphatics, nitrate esters, nitramines, polynitroarenes, and polynitroheteroarenes. The calculated values can be used as inputs for other thermochemical/hydrodynamic computer codes. This computer code is also able to calculate the activation energies of thermal decomposition of polynitroarenes and nitramines in condensed state. The number of carbon, hydrogen, oxygen, and nitrogen atoms and specification of some molecular fragments are input parameters for this code without using any experimental data. The new algorithms on the base of easy-to-get input parameters are tested for some new energetic compounds, which provide more reliable results as compared to the best available methods.
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