Materials Literature
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The dispersion of longitudinal stress waves as they propagate in pressure bars distorts the shape of the puise, and so can be a limitation to the accuracy of high strain rate tests such as the compressive split Hopkinson pressure bar (SHPB). The method of dispersion correction described in this paper is based on a bar…
The temperature dependence of dc and ac conductivity in the vicinity of Tc3 = 112.5 K (on heating) for the MABB crystal was measured. For ac conductivity the frequencies between 20 Hz and 1 MHz were applied. The behaviour of conductivity was explained by means of power law [sgrave]ac = [sgrave]dc + Aωp, where ω is the…
Lattice dynamics calculations are presented for the synthetic cyclosilicate ${\mathrm{BaCuSi}}_{2}{\mathrm{O}}_{6},$ which contains isolated four-membered silicate rings. The results are analyzed in relation to published claims that vibrational modes of similar rings are responsible for the sharp ${D}_{1}$ ``defect li…
Triglycine sulfate-gelatin (TGS-gelatin) films were grown by evaporation of the water from a solution containing gelatin and TGS. The pyroelectric and dielectric properties of the films were highly dependent on their water content. Moist films had higher pyroelectric coefficients and lower coercive fields than dry fil…
Abstract The isolation at −78°C and characterization of the novel crystalline reactive porphinatomanganese(IV) complex Mn‐(TDCPP)(OCl) 2 ( 5 ) is described. 5 is compared with the porphinatomanganese(IV) complexes Mn(TDCPP)(C 6 H 5 IOCl) 2 (2), Mn(TDCPP)(C 6 F 5 10C1)CI ( 3 ) and Mn(TDCPP)(OCH 3 ) 2 , ( 4 ). The stoic…
Describes an investigation into the sensation of wetness and dampness by both subjective and objective measurements. When fabric has a high water content, the subject felt a strong feeling of stickiness. This stickiness was evaluated objectively by measurement of the friction between the wet fabric and artificial skin…
With an increase in the use of polyimides in aerospace applications, the degradation of polyimides caused in the space environment is receiving more attention. In this paper, a ground experiment in which polyimides were exposed to high-energy ions in the space plasma environment was carried out. The effects of oxygen…
Abstract Progress on the development of an in-situ nanoindentation specimen holder for the Kratos 1.5MeV HVEM located at the National Center for Electron Microscopy, Berkeley, CA, USA, is reported. There is currently considerable work being reported on the mechanical properties (i.e., hardness, delamination, wear, etc…
Abstract Experimental data on particulate‐filled polypropylene rupture are presented, with discussion and explanation of the regularities found. The systems studied are characterized by ductile properties of a semi‐crystalline matrix and a low level of interfacial interaction. Polypropylene as a host and aluminum hydr…
The electronic structure of Fe${}_{3}$B in orthorhombic $(o{\ensuremath{-}\mathrm{F}\mathrm{e}}_{3}$B) and body-centered tetragonal (bct-Fe${}_{3}$B) structures are calculated using the spin-polarized linear muffin-tin orbitals method. Based upon the calculated electronic structure, we present theoretical results on t…
The crystal structures of pure L-carvone [( R )-(−)-2-methyl-5-(1-methylethenyl)-2-cyclohexen-1-one, C 10 H 14 O] and the equimolar mixture DL-carvone ( RS ) have been determined by Patterson-search methods at low resolution from laboratory X-ray powder diffraction data (218 K). Crystal data: (L) a = 6.8576 (3), b = 6…
Compression tests have been performed on polycrystalline b.c.c. iron in order to study dynamic plasticity and evolution of microstructure. The paper describes the experimental setups and the results obtained at 295 K for strain rates 10-3s-1 ≤ dε/dt ≤ 104s-1 and plastic strains up to large values ε-0.8. Stress-strain…
Thermally induced packing correlations and apparent microphase spinodal boundaries are studied for conformationally asymmetric diblock copolymer melts using the “polymer reference interaction site model” (PRISM) theory. Microphase instabilities are deduced from predictions of the collective scattering intensities and…
A series of poly[methyl methacrylate (M)- b -styrene (S)- b -butadiene (B)- b -S- b -M], or MSBSM, pentablock copolymers have been successfully synthesized by sequential living anionic polymerization initiated with the diadduct of tert -butyllithium ( t -BuLi) onto m -diisopropenylbenzene ( m -DIB) in a cyclohexane/di…
A double-networked natural rubber (DNNR) was prepared by a “two-step crosslinking” method, in which the crosslinking was achieved while the natural rubber was in a stretched condition. The swelling behavior, tensile properties, creep, recovery, and permanent set were investigated. Generally, the observed mechanical pr…
The specimen size of concrete specimens should be large enough to be representative of the material. In this paper it is shown how the bundle bars method allows the dynamic mechanical characterisation by using the uniaxial elastic wave propagation theory used in the Hokinson bar technique.
Structures of six dimeric copper(II) benzoylformates (I)–(VI) have been determined by single-crystal X-ray diffraction and the magnitudes of the spin-exchange interaction ( H = −2 J S 1 S 2 ) have been determined based on the magnetic susceptibility measurement. (I): Tetrakis(\mu-benzoylformato- O , O ′)bis(pyridine)d…
In order to clarify aspects of dealloying and stress corrosion cracking of copper‐gold alloys, the electrochemical oxidation behavior of pure polycrystalline gold in 0.6 M NaCl and in 0.3 M Na 2 SO 4 solutions was studied using low‐scan rate cyclic potentiodynamic polarization, potential stepping, and scratching techn…
Other| August 01, 1997 The synthetic Cr 2+ silicates BaCrSi4O10; the missing links in the gillespite-type ABSi4O10 series Ronald Miletich; Ronald Miletich Universitaet Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar David R. Allan; D…
Abstract A butyl methacrylate oligomer with furan end‐groups was synthesized by ozonolysing a poly(butyl methacrylate‐ co ‐butadiene) latex. The end‐groups of this oligomer were amidated with aminomethylfuran to give a coagulated mass of derivatized oligomers. This furan functional oligomer was then mixed with poly(et…