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  • 1
    Digitale Medien
    Digitale Medien
    Discrete meso-dynamic simulation of thermal explosion in shear bands (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3574-3580 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A two-dimensional discrete element code (DM2), was used to model a complex interplay of deformation and chemical reaction in a region of localized shear at the particle level. Two exothermic mixtures of Nb–Si and Ni–Al particles having dimensions of 5 μm×25 μm were considered. Computational experiments showed that the mixtures exhibit a classical phenomenon of thermal explosion under high rates of shearing. The threshold shear rates were found to be approximately 1.2×108/s and 8.0×107/s for the Nb–Si and Ni–Al mixtures, respectively. The ignition conditions were sensitive to the thermal boundary conditions and the computationally observed values are considered to be the upper limits. The thermal explosion results from the interaction of mechanical mass mixing and heating that were primarily caused by thinning (plastic deformation) and fragmentation. The modeling showed an interesting result: that there is a ratio of fracture strengths that maximizes the mass mixing. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368532
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  • 2
    Digitale Medien
    Digitale Medien
    Constitutive model of shock-induced chemical reactions in inorganic powder mixtures (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3394-3402 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: An improved hydrodynamic model has been developed for analysis and interpretation of shock-induced chemical reactions in inorganic powder mixtures. Attention is focused on the interaction of hydrodynamic flow with the thermodynamic changes associated with chemical reactions such as specific volume, specific internal energy, and material properties. Predictive capabilities of the model have been illustrated using experimental shock wave profile data involving Ni-Al and Al-Fe2O3 mixtures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357469
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  • 3
    Digitale Medien
    Digitale Medien
    A numerical study of shock-induced particle velocity dispersion in solid mixtures (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 1292-1298 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Shock-induced particle velocity dispersion in solid mixtures was numerically investigated using two approaches: discrete element simulation and continuum mixture calculation. Results show (i) a trend-wise agreement between the two models, (ii) nonequilibrium distributions of particle velocity dispersion, and (iii) particle velocity dispersions of 20–100 m/s for a 10 GPa shock wave in Ni/Al mixtures and 5–70 m/s for a 5 GPa shock wave in Ti/Teflon mixtures. Particle velocity dispersions of this magnitude are thought to be the driving mechanism for initiation of chemical reactions in reactive solid mixtures. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.368197
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  • 4
    Digitale Medien
    Digitale Medien
    Ultrafast chemical reactions between nickel and aluminum powders during shock loading (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 520-521 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A recent investigation of powdered Ni-Al systems subject to shock loading has yielded evidence that reactions occur during the shock front. Time-resolved measurements of normal shock pressure indicate that an "excess pressure'' is generated possibly due to an exothermic reaction in the Ni-Al system. These reactions appear to occur during the 100 ns that represent the shock front. A clear reaction threshold is observed and corroborated by micrographs of the recovered samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.107874
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  • 5
    Digitale Medien
    Digitale Medien
    Shock-induced chemical reactions in a Ni/Al powder mixture (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3365-3367 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A new 50 mm powder gun was used to reproduce and to extend the real-time observations of ultra-fast exothermic reactions in a Ni/Al powder mixture at the shock front. Shock profiles measured by a manganin gauge show that (1) the threshold pressure for reaction is about 14 GPa; (2) the initiation criteria based either on shock energy or melting are in contradiction with experimental evidence. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.119172
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  • 6
    Digitale Medien
    Digitale Medien
    Recent Advances in Sericulture (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 25 (1980), S. 49-71 
    Details
    ISSN: 0066-4170
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.en.25.010180.000405
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  • 7
    Digitale Medien
    Digitale Medien
    Elemental diet modulates the growth of Clostridium difficile in the gut flora (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 20 (2004), S. 0 
    Details
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background and aims : Tube feeding is regarded as a risk factor for Clostridium difficile-associated diarrhoea. Recently, we reported that C. difficile toxin was frequently found in patients receiving an elemental diet. The present study was conducted to clarify whether elemental diets are associated with the growth of C. difficile in the gut flora.Methods : C. difficile was cultured for 72 h in various concentrations of elemental diet containing 3% thioglycollate, and the growth rate or activity of C. difficile was evaluated by Gram stain or by measuring optical density at 560 nm. Faecal samples from 10 healthy adults were cultured in elemental diet + 3% thioglycollate. RNA was extracted from faeces with glass powder, which can eliminate PCR inhibitors, and mRNA of C. difficile toxin B was measured by reverse transcription PCR.Results : Maximum OD560 value during culture in thioglycollate-containing elemental diet was 2.4 times higher than that in thioglycollate alone (P = 0.0163). Viability of C. difficile was decreased in thioglycollate but not in thioglycollate-containing elemental diet. Toxin B mRNA was detected in five faecal samples (50%) before culture and in all samples after culture.Conclusions : Our results suggest that an elemental diet can modulate the growth of C. difficile in the gut flora.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2036.2004.01969.x
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  • 8
    Digitale Medien
    Digitale Medien
    Melting and the hugoniot equation
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 28 (1967), S. 1569-1577 
    Details
    ISSN: 0022-3697
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(67)90288-0
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  • 9
    Digitale Medien
    Digitale Medien
    Clinical usefulness of cimetidine for the treatment of acute intermittent porphyria - a preliminary report
    Amsterdam : Elsevier
    Clinica Chimica Acta 167 (1987), S. 267-271 
    Details
    ISSN: 0009-8981
    Schlagwort(e): Acute intermittent porphyria ; Cimetidine ; δ-Aminolevulinic acid
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-8981(87)90346-9
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  • 10
    Digitale Medien
    Digitale Medien
    The distribution and properties of transhydrogenases in insect tissues
    Amsterdam : Elsevier
    Comparative Biochemistry And Physiology 17 (1966), S. 1-18 
    Details
    ISSN: 0010-406X
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0010-406X(66)90002-8
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