Materials Literature
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A novel cross-shaped porphyrin pentamer having four imidazolyl-porphyrinatozinc(II) moieties, one at each meso-position, was prepared. AFM measurements confirmed the formation of a large twodimensional porphyrin array structure: a thin layer of 6∼7 porphyrins was assembled over a 350 × 350nm2 area, representing linkag…
A previously developed 3D model 14 for the simulation of selective dissolution and passivation of alloys, based on a Monte Carlo method, has been expanded. The probabilities of dissolution used in the first model were set empirically as a function of the number of first nearest neighbors. In the present model the ener…
Precipitation behavior of intermetallic phases in ferrite matrix is investigated by transmission electron microscopy (TEM) in Fe-10Cr-1.4W-4.5Co (at%) alloys with and without 0.3 at%Si. It is intended to provide basic information for the alloy design of ferritic heat resistant alloys strengthened by intermetallic comp…
A new class of cage-like oligomers were selectively formed by hydrolysis and polycondensation of a methylene-bridged bistrialkoxysilane precursor in the presence of tetramethylammonium hydroxide, which led to the creation of novel silica-based hybrid materials.
For improving the understanding of molecular mobility through the glass transition, we compare results obtained by two dielectric techniques, dynamic dielectric spectroscopy (DDS) and thermo‐stimulated currents (TSC), for a series of amorphous model polymers, the poly(n‐alkyl methacrylates). This permits us to determi…
Corrosion inhibition properties of chemical and electrochemically synthesized polyaniline(PAni), poly-o-methoxianiline(POMA)and their copolymers, in form of coatings of stainless steel AISI 304 and aluminum alloy 6061-T6 are studied in 3%and 0.1 M NaCl solutions, respectively. Polarization curves showed that the prote…
The advancement of self-sealing ceramic matrix composites offers durability improvements in hot section components of gas turbine engines. These durability improvements come with no need for internal cooling and with reduced weight. Building on past material efforts, ceramic matrix composites based on either a carbon…
A series of tensile testing was carried out on the ultrafine grained 5083 Al alloy, which was fabricated by equal channel angular pressing (ECAP) with different ECAP strains, at low temperature superplastic (LTS) temperature of 548 K. This investigation was aimed at examining the effect of the ECAP strain inducing dif…
The full set of piezoelectric stress coefficients and the spontaneous polarization of ferroelectric Im2m sodium nitrite were calculated by first-principles quantum-mechanical methods. The Berry phase approach, implemented in the periodic LCAO computational scheme, was employed with an all-electron basis set and the Ha…
SUMMARIES Bleached softwood bisulphite and alum-rosin sized rag paper samples were subjected to conservation treatments with calcium hydroxide and with calcium hydroxide – methyl cellulose solutions. Accelerated ageing at 90ºC and 50% RH was done in order to evaluate the influence of these treatments on several paper…
Isothermal combustion experiments of coke pellet mixed with lime/limestone had been performed to investigate the effect of lime/limestone addition on the reduction of NO and SO2 emission. The coke pellets were combusted between 700°C and 1300°C under pure oxygen atmosphere. Combustion kinetics and conversion data of S…
Specific features of the test method procedure capable for determining the plasticity characteristic dH by indentation of inhomogeneous coatings affected by residual stress was clarified. When the value of the plasticity characteristic for coating was found to be as great as dH > 0.5 a simplified model was found to…
A novel modified poly(dl-lactic acid) (PDLLA) was obtained by covalently grafting of maleic anhydride onto the backbone of PDLLA, attempting to improve PDLLA's hydrophilicity and cell affinity and to provide reactive groups for further chemical modification. FTIR, ^13 C NMR and DSC were used to characterize the maleic…
During the launch of the Space Shuttle Columbia on January 16, 2003, foam originating from the external tank impacted the shuttle's left wing 81 seconds after lift-off. Then on February 1st, Space Shuttle Columbia broke-up during re-entry. In the weeks that followed, the Columbia Accident Investigation Board had forme…
In this paper, formamide was firstly used as plasticizer to prepare thermoplastic starch (TPS), which could suppress the retrogradation of TPS by X-ray diffractometry (XRD) and show a good flexibility, but was weaker than conventional glycerol-plasticized TPS (GPTPS). When urea was introduced into plasticizer, both th…
Autor: Guo, Y. et al.; Genre: Zeitschriftenartikel; Im Druck veröffentlicht: 2004; Keywords: MPI für Metallforschung; Ehem. Abt. Gao; ; Titel: Structural transition of copper nanowires confined in single-walled carbon nanotubes
The paper presents an overview of commercial Ex-plosive Ordnance Disposal (EOD) robots and a new system, specially conceived and designed for airplane security tasks. The guidelines for the design of this new EOD robot and the expected innovative performances and characteristics have been established in collabora-tion…
Effects of niobium addition on strengthening, hydrogen absorption and hydrogen embrittlement have been investigated paying attentions to carbides morphologies by using laboratory melted clean steels. Addition of niobium and austenitizing at high temperature enhanced temper softening resistance due to fine niobium carb…
Titanium and its alloys are still very advantageous for aerospace applications in the world. Non-aerospace applications of titanium and its alloys are much emphasized comparing with aerospace applications in Japan. Recently, titanium and its alloys are getting much attention in medical applications and health care goo…
We here present ab initio calculations on small AsnSm clusters that are building blocks for the formation of continuous random networks (CRN) generally found in AsxS100-x glasses. The calculations were performed by density functional theory (DFT). Geometries, vibrational frequencies, Raman intensities for the clusters…