Materials Literature
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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…
The effect of hydrothermal treatment on the phase stability, microstructure and mechanical properties of tetragonal zirconia ceramics stabilized with 3 mol%yttria was studied. At temperatures of 140-260°C the tetragonal phase transformed into monoclinic zirconia. The degree of transformation increased with increasing…
The partial substitution of La and Y for Fe into nanocrystalline Mg 0 . 5 Cu 0 . 5 Fe 2 O 4 compound was studied. The Mg-based ceramics present an attractive set of properties: high electrical resistivity, high Curie temperature and chemical stability. Y 3 - and La 3 + ions affect the structure and magnetic and electr…
A series of silica-supported cerium oxide samples having various cerium content were prepared by conventional impregnation method, followed by calcination in air. Ce LIII-edge XANES study revealed that highly dispersed cerium oxide species on silica surface were predominantly in trivalent oxidation state and cerium ox…
Here TBC top coat failure and life time are considered as a two-step process, where step 1 is time to delamination macro-cracking and step 2 is time to through macro-cracking. This two-step failure mechanism comes directly from critical strain measurement data and traditional coating failure theory. The critical strai…
Cl K-edge XANES measurements of atmospheric corrosion products (rust) formed on Fe, Fe-Ni and Fe-Cr alloys in chloride pollution have been performed using synchrotron radiation in order to clarify roles of anticorrosive alloying elements and of Cl in the corrosion resistance of weathering steel. The spectra of binary…
The small karstic river Zrmanja (69 km) discharges into the eastern– central Adriatic Sea, forming shallow, highly stratified, oligotrophic estuary. The abundance of periphytic pennate diatoms (attached to artificial substrates) and their presence in the plankton community were analysed in the upper estuary, in July 2…
Gold nanoparticles were obtained directly in solid polymer films by thermal decomposition of the [O(Au(PPh3))3][BF4] precursor molecularly dispersed in the polymer and by decomposition of microcrys-tals on different supports. The nanoparticles were characterized with transmission electron microscopy (TEM), scanning el…
As one of effective usages of the wastes in an aluminum regeneration process, the syntheses of hydrotalcite (HT), which is a functional inorganic material having layered structure of complex hydroxide, were carried out by using aluminum dross and MgCl2 waste solution as raw materials. Various physical properties such…
Thirty five low-symmetry tilting phases of the octahedra in which the atoms located at the initial octahedral position remain equivalent are derived for the perovskite structure at the k 10 ( X ), k 11 ( M ), and k 13 ( R ) points of the Brillouin zone. For each low-symmetry phase, structural data are presented and a…
Diatom assemblages from an abalone (rocky) habitat were sampled in April and November 1999 and in April 2000 on the western side of Isla Magdalena, RCS., Mexico. Overall 236 taxa were recorded, including 10 new records, and 56 species that have been observed exclusively in this type of habitat in the Baja California p…
The development of a simple and highly selective method for the preparation of substituted U-shaped terpyridines is described. The treatment of imine 5 with ternary iminium salts 2 leads to the terpyridines 4. A possible mechanism is discussed. The terpyridine derivatives are used for the preparation of several platin…
The dislocation configurations and their interactions with γ-hydrides were investigated in cyclically strained titanium containing 77 ppm hydrogen. At least three sets of dislocations could be activated in hydride precipitates. To accommodate the inhomogeneous strain between the matrix and the hydrides a crystal rotat…