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  Subjects -> ENGINEERING (Total: 2284 journals)
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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 227)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 6)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access  
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 254)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Composites Science and Technology     Hybrid Journal   (Followers: 192)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 30)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Combustion, Explosion, and Shock Waves
  [SJR: 0.348]   [H-I: 28]   [13 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0010-5082 - ISSN (Online) 1573-8345
   Published by Springer-Verlag Homepage  [2355 journals]
  • Numerical analysis of combustion of a hydrogen–air mixture in an
           advanced ramjet combustor model during activation of O 2 molecules by
           resonant laser radiation
    • Authors: L. V. Bezgin; V. I. Kopchenov; A. M. Starik; N. S. Titova
      Pages: 249 - 261
      Abstract: This paper presents a numerical study of the combustion of a hydrogen–air mixture in a model ramjet combustor with separate hydrogen and air supply during activation of O2 molecules by resonant laser radiation at a wavelength of 762.3 nm and 193.3 nm. The calculation is made using the parabolized Navier–Stokes equations taking into account chemical reactions, laser irradiation, and the nonuniformity of air parameters at the combustor inlet due to the complex gas-dynamic structure of the flow in the air intake. It is shown that the combustion completeness at the combustor outlet can be increased by a factor of 2.8 by redistributing the hydrogen supply through the system of fuel tank pylons. Further increase in the combustion completeness can be obtained by exposure of a narrow flow region to resonant laser radiation, more effectively at a wavelength of 193.3 nm. The combination of laser exposure with hydrogen supply redistribution increases the combustion efficiency by a factor of more than 4.7 compared to the base case. In this case, this provides a 95% increase the longitudinal force component in the portion of the internal engine duct that provides a positive contribution to the thrust. Estimation of the energy efficiency of using laser radiation shows that the laser energy input required to achieve this effect is 40–80 times (depending on the fuel supply method) less than the increase in the chemical energy (compared to the case of no laser exposure) released due to fuel combustion.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030017
      Issue No: Vol. 53, No. 3 (2017)
  • Initiation of homogeneous combustion in a high-velocity jet of a
           fuel–air mixture by an optical discharge
    • Authors: V. N. Zudov; P. K. Tretyakov
      Pages: 262 - 269
      Abstract: The effect of a focused pulsed-periodic beam of a CO2 laser on initiation and evolution of combustion in subsonic and supersonic flows of homogeneous fuel–air mixtures (H2 + air and CH4 + air) is experimentally studied. The beam generated by the CO2 laser propagates across the flow and is focused by a lens at the jet axis. The flow structure is determined by a schlieren system with a slot and a plane knife aligned in the streamwise direction. The image is recorded by a high-speed camera with an exposure time of 1.5 μs and a frame frequency of 1000 s−1. The structure of the combustion region is studied by an example of inherent luminescence of the flame at the wavelengths of OH and CH radicals. The distribution of the emission intensity of the mixture components in the optical discharge region is investigated in the present experiments by methods of emission spectroscopy.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030029
      Issue No: Vol. 53, No. 3 (2017)
  • Autoignition mechanism of dimethyl ether–air mixtures in the
           presence of atomic iron
    • Authors: V. M. Shvartsberg; T. A. Bolshova; A. G. Shmakov; O. P. Korobeinichev
      Pages: 270 - 275
      Abstract: The search for reactive additives capable of reducing the combustibility of dimethyl ether is an important problem due to the widening use of ether as an alternative environmentally friendly motor fuel. This paper presents a numerical study of the autoignition chemistry of mixtures of dimethyl ether with air in the presence of atomic iron. Atomic iron, which is an effective inhibitor of premixed laminar hydrocarbon flames, was found to shorten the induction period. However, the additive affects only the first stage of the induction period. The mechanism of promotion of the low-temperature oxidation of dimethyl ether–air mixtures by atomic iron is the formation of hydroxyls in reactions involving iron compounds. Since the additive hardly changes the duration of the second stage of the induction period, it can be suggested that OH radicals play an insignificant role in the low-temperature oxidation of dimethyl ether at this stage.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030030
      Issue No: Vol. 53, No. 3 (2017)
  • Effects of temperature and moisture on the ignition behavior of silane
           release into air
    • Authors: H.-Yu. Tsai; H.-L. Hung; S-Y. Wu; Ch.-W. Ku; J.-R. Chen; P. A. Fomin; A. V. Fedorov
      Pages: 276 - 282
      Abstract: The effects of silane temperature and ambient moisture on the ignition behavior are considered. The critical velocity for delayed ignition is determined for different silane temperatures and moisture contents in ambient air. The logarithm of the critical exit velocity is found to be inversely proportional to silane temperature. It is also observed that moisture in air has a strong inhibiting effect on silane autoignition in air. From a safety perspective, it is concluded that prompt ignition of silane is favored in a high-temperature and low-humidity environment.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030042
      Issue No: Vol. 53, No. 3 (2017)
  • Experimental study of the combustion efficiency of two-phase gasification
           products of energetic boron-containing condensed compositions in a
           high-enthalpy airflow
    • Authors: K. Yu. Aref’ev; A. V. Voronetskii; A. N. Prokhorov; L. S. Yanovskii
      Pages: 283 - 292
      Abstract: This paper describes an experimental setup and a method for determining the combustion efficiency of the gas and condensed phases of gasification products of energetic boroncontaining condensed formulations in a high-enthalpy subsonic airflow. The results of investigation of the combustion of two-phase combustible mixtures in a channel of constant cross section at various temperatures, pressures, and component ratios are given. The combustion regularities of boron-containing condensed phases in a high-enthalpy airflow are identified. The obtained data can be useful in computational and experimental studies of propulsion system operation.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030054
      Issue No: Vol. 53, No. 3 (2017)
  • Study of a hybrid gas generator for a ducted rocket
    • Authors: D. Komornik; A. Gany
      Pages: 293 - 297
      Abstract: A performance analysis and experimental study of a hybrid gas generator to be used in a ducted rocket are presented. Such a system exhibits potential advantages with regard to safety, performance, costs, availability of the fuel components, storability, and thrust control. A combination of a paraffin wax fuel and oxygen in the gas generator ensures a high regression rate and reveals oxidizer-to-fuel ratios as low as 0.14 in the gas generator (compared to the stoichiometric ratio of 3.4). A fuel regression rate correlation versus the oxidizer mass flux is derived, presenting a major advantage for the fuel flow rate management in comparison to control of the solid propellant gas generator burning rate through the pressure exponent, which requires mechanical interference with the hot nozzle flow to ensure a change in the combustor pressure and a corresponding change in the burning rate. Evaluation of the ducted rocket (with different oxidizers) versus pure ramjet performance shows a higher specific thrust for the former, though the latter exhibits a higher specific impulse.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030066
      Issue No: Vol. 53, No. 3 (2017)
  • Propagation of a cylindrical shock wave in a mixture of a non-ideal gas
           and small solid particles under the action of monochromatic radiation
    • Authors: G. Nath; P. K. Sahu
      Pages: 298 - 308
      Abstract: A cylindrical shock wave in a dusty gas under the action of monochromatic radiation into the stellar atmosphere with a constant intensity per unit area is discussed. The gas is assumed to be grey and opaque, and the shock is assumed to be transparent. The dusty gas is considered as a mixture of a non-ideal gas and small solid particles. To obtain some essential features of shock propagation, small solid particles are considered as a pseudo-fluid, and it is assumed that the equilibrium flow condition is maintained in the entire flowfield. The effects of the parameters of the gas non-idealness, the mass concentration of solid particles in the mixture, the ratio of the density of solid particles to the initial density of the gas, and the radiation parameter on flow variables are investigated. It is shown that an increase in the gas non-idealness and the radiation parameter has a decaying effect on the shock waves, whereas the shock strength increases with an increase in the ratio of the density of solid particles to the initial density of the gas. It is found that an increase in the gas non-idealness and the ratio of the density of solid particles to the initial density of the gas has the opposite effects on the fluid velocity, pressure, and shock strength. It is also shown that an increase in the radiation parameter has a trend to decrease the flow variables and the shock strength.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030078
      Issue No: Vol. 53, No. 3 (2017)
  • Shock compression of vanadium hydrides and deuterides with different
           concentrations of gas atoms
    • Authors: A. N. Golubkov; L. F. Gudarenko; M. V. Zhernokletov; A. A. Kayakin; A. N. Shuikin
      Pages: 309 - 318
      Abstract: This paper presents the results of experimental studies of the shock compression of samples of vanadium deuterides and hydrides of the following compositions: VX0.51, VX0.7–0.9, and VX≥1.6, where X is H or D. The experiments were carried out in the pressure range 20–140 GPa. The technology of synthesizing samples using electrolytic vanadium of not less than 99.7% purity. The Hugoniots of vanadium deuterides and hydrides were determined using the well-known reflection method. The samples were compressed using shock-wave generators based on the use of explosive charges of different power. The obtained experimental data are described by an equation of state developed using a model in which the specific heats and Gr¨uneisen ratios of ions and electrons are functions of density and temperature. At low temperature, the specific heat changes in accordance with the Debye theory. The removal of the degeneracy of the electron gas at higher temperatures is considered. The influence of ionization processes on the thermodynamic functions is effectively taken into account.
      PubDate: 2017-05-01
      DOI: 10.1134/s001050821703008x
      Issue No: Vol. 53, No. 3 (2017)
  • Synthesis, XRD and DFT studies of a novel cocrystal energetic perchlorate
           amine salt: Methylamine triethylenediamine triperchlorate
    • Authors: P. Ma; J.-Ch. Jiang; Sh.-G. Zhu
      Pages: 319 - 328
      Abstract: This paper reports the synthesis, experimental and theoretical studies of a novel inorganic-organic cocrystal energetic material: methylamine triethylenediamine triperchlorate (MT). MT is synthesized by a rapid “one-pot” method. The performance test of MT shows that it is more powerful and has lower sensitivity in comparison to the benchmark energetic material, i.e., 2,4,6-trinitrotoluen (TNT). The molecular and crystal structures of MT are determined by means of x-ray diffraction (XRD). The compound crystallizes in a monoclinic system (space group Pn) with cell dimensions a = 8.975(18), b = 17.836(4), and c = 10.455(2) Å. The band structure and the density of states are calculated by an abbreviated form of the CASTEP code. The first principle tight-binding method within the general gradient approximation is used to study the electronic band structure, density of states, and Fermi energy. The results indicate that the main mechanism of cocrystallization originates from the Cl—O ···H hydrogen bonding between —ClO4 and —NH2.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030091
      Issue No: Vol. 53, No. 3 (2017)
  • Shock wave induced primary thermal fragmentation of coal particles
    • Authors: S. Jaisankar; D. M. Patadiya; T. S. Sheshadri
      Pages: 329 - 339
      Abstract: Coal particles when subjected to shock waves can undergo rapid fragmentation, pyrolysis, and combustion, causing enhanced process intensity and efficiency. Particle fragmentation plays a crucial role in this process. Exposure of coal particles to a shock wave is modelled in the present work as combined convection and radiation at the surface and conduction in the interior. Local temperatures within a coal particle and the corresponding thermal stresses are computed to study particle failure. Particle fracture is modelled by a three-parameter Weibull probability to predict the failure location and time. Simulations indicate that pulverized coal of size up to 250 μm subjected to a shock wave for varying operational, thermal, and physical parameters can experience initial failure within 150 μs. Particles of size d ≥ 50 μm or higher wave strengths (with Mach numbers M ≥ 5) mostly trigger exfoliation, while interior fragmentation dominates at smaller sizes (d ≤ 25 μm). An initial fracture study reveals that pulverized coal with predominant sizes d ≤ 100 μm and the coal rank from lignite to bituminous coal is potentially suitable for detonation combustion in waves at Mach numbers M = 3–6. Coal particles under continuous exposure to post-shock conditions undergo recursive exfoliation until the core is 20–40 μm, after which an interior fragmentation phase is seen until the core is about 1–3 μm. Much finer coal particles, of the order of internal fragmenting cores, are hardly fractured due to low thermal stresses caused by rapid uniform heating. The fracture model approach for studying shock-induced combustion is validated by a reasonable match of the computed ignition delay with experiments. The fragmentation history indicates a substantial increase in the particle surface area and temperature under shock exposure, as against conventional combustion, leading to an increased order of the burning rates at the onset of ignition, which can sustain through the entire burning phase.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030108
      Issue No: Vol. 53, No. 3 (2017)
  • Effect of interfacial heat transfer on the critical conditions of
           shock-wave initiation of chemical reaction in porous energetic materials
    • Authors: A. V. Attetkov; E. V. Pilyavskaya
      Pages: 340 - 343
      Abstract: This paper presents the results of numerical analysis of a viscoplastic model for hotspot formation based on the solid-state mechanism of hotspot ignition of an energetic porous material under shock-wave loading. The highly viscous pore collapse regime is considered, which is of great interest for theoretical studies of the shock-wave initiation of heterogeneous energetic materials. Interfacial heat transfer was described under the assumption that the gas is ideal and hence homobaric (uniform in pressure). Parametric analysis was conducted, and characteristic features of the effect of heat transfer and interfacial heat transfer on the critical conditions of shock-wave initiation of chemical reaction in the energetic porous material were determined.
      PubDate: 2017-05-01
      DOI: 10.1134/s001050821703011x
      Issue No: Vol. 53, No. 3 (2017)
  • Experimental investigation on impact ignition of Al/PTFE reactive
    • Authors: M. H. Zhang; W. J. Ruan; K. Dong; Y. G. Yu
      Pages: 344 - 348
      Abstract: Reactive materials are a new class of energetic materials that extremely and efficiently release energy under the influence of high impact loading. An impact tester is used in the present study to explore the impact ignition characteristics of Al/PTFE reactive materials and the impact ignition pressure of Al/PTFE reaction materials under different conditions. The experimental result shows that the critical ignition pressure is approximately 1.44 GPa. Meanwhile, it also shows that the material compactness has a much less pronounced effect on the impact ignition pressure for this reactive material if the loading time scales are of the order of several milliseconds. Plastic work and viscous heat both play a significant role in impact ignition. Finally, it is shown that impact ignition ensures a higher energy release rate than surface ignition.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030121
      Issue No: Vol. 53, No. 3 (2017)
  • Measuring the temperature of PETN explosion products with iron inclusions
    • Authors: B. P. Aduev; D. R. Nurmukhametov; I. Yu. Liskov; R. Yu. Kovalev; Ya. V. Kraft
      Pages: 349 - 352
      Abstract: The spectral-kinetic characteristics of luminescence of PETN with iron nanoparticle inclusions are measured in real time in the case of a laser initiated explosion (the wavelength is 1064 nm, and the pulse duration is 14 ns). During the action of the laser radiation pulse, the luminescence of the samples is observed, and the explosive decomposition occurs in a microsecond time interval. The spectral pyrometry method is used to establish the thermal nature of explosive luminescence. The explosion temperature is estimated to be 3400 ±100 K.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030133
      Issue No: Vol. 53, No. 3 (2017)
  • Detonation velocity of highly dispersed ammonium perchlorate and its
           mixtures with explosive substances
    • Authors: A. A. Kotomin; S. A. Dushenok; M. A. Ilyushin
      Pages: 353 - 357
      Abstract: This paper describes the measurement of the detonation velocities close to ideal velocity relative to large charges of highly dispersed ammonium perchlorate (AP) and its mixtures with different explosive substances in thick-walled steel pipes. The relationship of the detonation velocity of AP with its density and the relationship between the detonation velocity of mixtures with the component ratios and oxygen coefficient of the mixtures are determined. The calculation of the detonation velocity of AP/explosive/Al three-component compositions is proposed for the first time.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030145
      Issue No: Vol. 53, No. 3 (2017)
  • Development of explosive transformation of NCT energy-intensive metal
           complex during bridge initiation
    • Authors: A. N. Ivanov; A. B. Syrtsov; S. N. Kiselev; E. E. Malikhov; A. A. Glazyrin
      Pages: 358 - 361
      Abstract: This paper describes the results of the experimental study on the effect of structural parameters, such as diameter, height, and density, on the development of explosive transformation of an NCP energy-intensive metal complex during bridge initiation. The results are compared with those obtained in shock-wave initiation.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030157
      Issue No: Vol. 53, No. 3 (2017)
  • Spallation affected fracture pattern of a titanium alloy plate subjected
           to linear shaped charge jet penetration
    • Authors: D.-Zh. Lyu; W.-R. Hong; M.-Ch. Yuan; H.-J. Xuan
      Pages: 362 - 369
      Abstract: In this paper, the commercial finite element code LS-DYNA is employed to simulate the process of a certain kind of a linear shaped charge jet penetrating into a TC4 (Ti–6Al–4V) titanium alloy plate of moderate thickness. The fracture profiles agree well with experimental observations, which confirms the validity of the code and the Johnson–Cook material model applied to describe the TC4 plate. The fracture pattern of the plate is drawn based on this comparison.
      PubDate: 2017-05-01
      DOI: 10.1134/s0010508217030169
      Issue No: Vol. 53, No. 3 (2017)
  • Measurement of thermal electromotive force and determination of combustion
           parameters of a mixture of 5Ti + 3Si under quasi-isostatic compression
    • Authors: V. A. Shcherbakov; V. Yu. Barinov
      Pages: 157 - 164
      Abstract: This paper presents experimental dependences of the temperature, thermal electromotive force, velocity, and width of the combustion wave of a heterogeneous mixture of 5Ti + 3Si on the quasi-isostatic compression pressure. Combustion parameters are calculated from the results of measurements of the temperature gradient and the electrical potential difference in the combustion wave. It is shown that under quasi-isostatic compression conditions, the maximum burning rate is 90 mm/s and the width of the combustion wave is 10 mm. It is found that the voltage–temperature characteristic of combustion of a heterogeneous mixture of 5Ti + 3Si has a hysteresis shape. The cause of the hysteresis related to a change in the bulk concentration of electric charge carriers in the combustion wave is discussed.
      PubDate: 2017-03-01
      DOI: 10.1134/s0010508217020058
      Issue No: Vol. 53, No. 2 (2017)
  • Ignition of titanium during fracture in oxygen
    • Authors: B. I. Bolobov
      Pages: 165 - 170
      Abstract: This work demonstrates that the heating of fracture fragments of rods made of VT1-0 commercial titanium and its alloys OT4-1 and PT3V in gaseous oxygen at a pressure pO2, which is accepted in this paper and in the works of other researchers as critical pressure p*, only leads to melting of individual regions of the formed juvenile surface, which differ from each other only by obstructed heat sink, while the metal–oxygen interaction does not transfer into combustion. However, this interaction does transfer into combustion during which the bulk of the metal burns out at a slightly higher pressure p**, which can be calculated from the thermal explosion equation for temperature T* that is equal to the melting point of titanium, with account for the dissociative absorption of oxygen molecules on the melt surface and the heat exchange coefficient corresponding to the case where the heat is transferred from the melt hemisphere to the semibounded solid body.
      PubDate: 2017-03-01
      DOI: 10.1134/s001050821702006x
      Issue No: Vol. 53, No. 2 (2017)
  • Simulation of the ignition of organic explosives by a laser pulse in the
           weak absorption region
    • Authors: V. A. Dolgachev; E. V. Duginov; A. V. Khaneft
      Pages: 211 - 218
      Abstract: Numerical simulation of the ignition of RDX, HMX, and TATB by a nanosecond laser pulse was performed. The heat-conduction equation was solved in cylindrical coordinates with allowance for the multiple reflection of the light beam, a zero-order exothermic reaction, and melting. Despite the small temperature gradient due to the smallness of the radiation absorption coefficient, violation of thermal equilibrium due to Arrhenius nonlinearity leads to ignition of energetic materials from the surface. The critical energy density for ignition of PETN, RDX, HMX, and TATB by a nanosecond laser pulse was determined. Calculations have shown that with identical absorption and reflection coefficients, PETN is the most sensitive and TATB is the most heat-resistant.
      PubDate: 2017-03-01
      DOI: 10.1134/s0010508217020125
      Issue No: Vol. 53, No. 2 (2017)
  • Dispersion of metals under shock-wave loading by relativistic electron
           pulses and impactors accelerated by electric explosion
    • Authors: E. V. Kosheleva; V. V. Mokhova; A. M. Podurets; V. T. Punin; N. I. Sel’chenkova; A. V. Til’kunov; M. I. Tkachenko; I. R. Trunin; A. Ya. Uchaeva
      Pages: 242 - 248
      Abstract: Depending on the geometry and amplitude–time characteristics of external impact, there may be accumulation of shock-wave energy in the samples, which reduces the time during which the structural materials retain their functional properties. Dispersion from the free metal surface of samples without and with pre-applied perturbations in the form of pyramids is considered. Under certain amplitude–time characteristics of external impact, dispersion from the tips of the pyramids occurs. The quantitative characteristics of dynamic destructive processes at different amplitude–time characteristics of external impact are determined for the purpose of introducing them into two- and three-dimensional codes to predict the behavior of metals under extreme conditions.
      PubDate: 2017-03-01
      DOI: 10.1134/s0010508217020162
      Issue No: Vol. 53, No. 2 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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