Materials Literature
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For the first time, to the best of our knowledge, a realistic approach for deriving an estimate by superior values of the surface energy of complex metallic alloys based on aluminium is proposed. It turns out that the surface energy of quasicrystals lies in the range 0.5–0.8 J/m 2 , in contrast to pure aluminium (1.15…
Interaction of liquid crystals with nanostructured surfaces is studied experimentally. Whereas photolithographic or AFM methods were used in the past for surface structuring, we use besides photolithography essentially replication methods for the creation of well-controlled nano-topologies. We established a laboratory…
A recently formulated electrical model of photoinduced volume expansion caused by the Coulomb interaction between photogenerated carriers in chalcogenide glasses is examined quantitatively. It is shown that, depending upon photoexcitation conditions, the model predicts either expansion or contraction. However, the cal…
For the purpose of following electricity demand change and improving the efficiency of generation for fuel cells, a new system, which is called metal hydride intermediate buffer method, is developing. The system uses the selective reacting function of hydrogen on metal hydride materials. It is said that metal hydride…
To find out the degradation behavior of polymer in the real space, space exposure experiments utilizing the International Space Station (ISS) were scheduled. PEEK sheets under tensile stresses were exposed to the environment around the ISS orbit, and were irradiated by atomic oxygen (AO), ultraviolet ray, and electron…
Ferritic spheroidal graphite cast irons generally exhibit intergranular fracturing even if the specimens are strengthened by silicon in solid solution when tested under wet conditions. The maximum area fraction of intergranular fracture is closely related to the microstructural feature and ambient aqueous environment…
The American Mineralogist Crystal Structure Database is a compilation of every crystal structure potentially of mineralogic or geologic interest. The database, seen as an outreach service, is funded and maintained by NSF, the Mineralogical Society of America and the Mineralogical Association of Canada. This database,…
The influence of stress and fatigue under various stress amplitudes on the magnetic properties of a range of magnetic alloys (Ni, Fe55Ni45, Fe64Ni36 and Fe54Ni29Co17) was studied. Barkhausen effect signal and symmetrical minor hysteresis loops were measured at various stages during the tensile and fatigue tests. The d…
A unified theory of the liquid‐glass transition based on the two band model in the harmonic potential approximation is presented. The Kauzmann paradox on the Kauzmann entropy crisis and the Vogel‐Tamman‐Fulcher (VTF) law on the relaxation times and the transport coefficients are elucidated. The hopping of the particle…
This paper discusses the systems for microcellular injection moulding developed and patented by Trexel and IKV. It then introduces a third design with initial findings and recommendations for modifications. The results suggest that microcellular foaming is possible introducing supercritical carbon dioxide in the nozzl…
The increasingly high capital investment required for large autoclaves, ovens and facilities for the processmg of large composite components creates a number of financial constraints for the development and manufacturing of larger composite aircraft products. This thesis has investigated the use of heated tooling as a…
Luminescence and defect properties of novel phosphor β-Zn3 (PO4) 2 : Zr^4+ were systematically investigated. Corresponding to its lowest optical absorption transition at 240 nm, phosphor emits a bluish-green light at 485 nm, which yields the Stokes shift about 20000 cm^-1. The unusual optical properties of Zr^4+ ion a…
Adding yttrium to magnesium can improve the mechanical properties,especially the mechanical behavior at high temperature.The valence electron structures of Mg-Y alloy were analyzed with the empirical electron theory of solids and molecules(EET).Calculation shows that yttrium is on the fifth hybrid level and magnesium…
International audience
Having higher melting temperature than polyethylene, polypropylene has been expected as insulation material for power cable. But isotactic polypropylene used generally is unsuitable as cable insulation because it shows poor flexibility, low breakdown strength due to growing spherulites, and so on. But stereoregular sy…
Univ Antwerp, B-2020 Antwerp, Belgium. Bio Minerals Nv, Destelbergen, Belgium. Limburgs Univ Ctr, BIOMED, Limburg, Belgium.
In order to investigate the effect of Mg, Al doping on the electronic structure of LiCoO2, and to find the mechanism of high electronic conductivity in Mg-doped LiCoO2, we have carried out first-principles calculations based on density-functional theory (DFT) for LiCoO2, Li(Co, Al)O2 and Li(Co, Mg)O2 systems. Studies…
(2004). Nano Bioceramics for Biomedical and Other Applications. Materials Technology: Vol. 19, No. 4, pp. 224-233.
An analytical model is described for characterizing the deformation and failure behavior of the concrete in the process of penetration and perforation. According to the energy balance relationship crossing the wave front, the continuity of movement of the surface of projectile and the energy transfer, the scaling law…
The continuous cooling curves during melt-spinning process of typical Fe3B/Nd2Fe14B-type nancomposite permanent magnet alloys Nd4Fe77.5-xTxB18.5 where T is Cr or Cu were measured using the infrared imaging technique and a continuous cooling transformation (CCT) diagram was constructed. The CCT diagram suggested that t…