Materials Literature
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Recent investigations of ultra fine-grained metals (Cu, Fe, Ni) performed within a Prague-Rossendorf-Ufa collaboration will be reviewed. The specimens were prepared by severe plastic deformation: the high-pressure torsion and equal channel angular pressing. Positron annihilation spectroscopy was used as the main metho…
Left-handed material (LHM) exhibiting negative permittivity and negative permeability in certain band has dispersive medium property varying with frequency. The effective permittivity and permeability function of this material have a similar form of Lorentz material model. Piecewise linear recursive convolution (PLRC)…
A study of the polymorphic transitions induced by annealing of fibers of syndiotactic polypropylene initially in the trans -planar form III and in the mesomorphic form is reported. Both the trans -planar form III and the mesomorphic form transform by annealing at high temperatures into a mixture of crystals of the ant…
Structural mechanisms and features of brittle and quasi-brittle fracture of nanocrystalline materials are theoretically analyzed. The role of size effects and internal stresses caused by a nonequilibrium structure during brittle trans-and intercrystallite fracture is studied. The dependence of the nanocrystalline mate…
An aluminum processing plant, which is located at the Antikyra Bay, at the northern margin of Corinth Gulf, is producing a high radioactive contamination in the marine environment, due to the discharge of bauxitic red mud tailings. The levels and the distribution of 238U, 232Th, 226Ra, 40K and 137Cs in marine sediment…
Stain repellent textiles are still a strong demand from textile industry as well as customers. Therefore, this work deals with an improved oleophobic treatment of PET textiles. Two polyester fabrics with different textile structures were examined, which requires a plasma treatment such as Ar/O 2 mixture enabling a goo…
Equal channel angular pressing (ECAP) has been used to process an Al–4·4 wt-%Mg alloy (AA5182) at room temperature (RT), 200°C and 400°C. The evolution of microstructure and mechanical properties after ECAP has been studied by metallographic observation, EBSD analysis and compression testing. The results show that ECA…
This paper presents the filament winding of revolution structures on a four-axis machine. A theoretical analysis is done in order to find the stable paths (geodesic) of the fiber on mandrel surface. In order to place the fiber along the stable path, the feed-eye trajectory, linear motion in two directions X and Z, and…
Recent progress in the synthetic chemistry and catalysis of polyoxometalates (POMs) is reviewed. The novel POMs and their derivatives emerging in nearly three years (2002–2004) are introduced, including POMs with novel structure, POMS-organic hybrid compounds and host-guest complexes. Our review is focused on the elab…
Abstract This article summarizes our recent efforts to chemical recycling of polymeric materials based on the equilibrium polymerization character of cyclic monomers. Spiro orthoesters ( SOE s), bicyclo orthoester, cyclic carbonates, and dithiocarbonates undergo ring‐opening polymerization to afford the corresponding…
Nach dem bisherigen Kenntnisstand haben geschweißte höherfeste Stähle die gleiche Ermüdungsfestigkeit wie geschweißte niedrigfeste Stähle. Um höherfeste Stähle auch in ermüdungsbeanspruchten Konstruktionen effektiv einsetzen zu können, bedarf es daher zusätzlicher Anstrengungen, um die Ermüdungsfestigkeit zu erhöhen,…
The transition temperature of high-density polyethylene (PE), low-density PE, and hydrogenated poly(butadiene), which was detected by the spin-labeled ESR method, was evaluated. The detected transition corresponded to the β transition of semicrystalline polymer PE. The transition temperature was found to depend on the…
Gold nanoclusters covered with 4-aminothiophenol (4-ATP) self-assembled monolayers (SAMs) were electrochemically assembled on an Au or ITO electrode. The assembly mechanism is discussed on the basis of results of electrochemical, FT-IR, and XPS measurements. The intensity of plasmon absorption of the gold nanocluster…
A new anisotropic magnetic hysteresis model based on the Prandtl operators is proposed. This model is suitable to calculate the magnetic vector field H from an imposed vector induction B. The model is easy to implement, requiring little computational effort with a small set of material parameters. The methodology is v…
An efficient method for the synthesis of metalloporphyrins in 71–98% yields from free‐base 5,10,15,20‐tetraarylporphyrins in ionic liquids under microwave irradiation has been described.
A novel azobenzene-based photochromic amorphous molecular material, tris[4-(phenylazo)phenyl]amine (TPAPA), was designed and synthesized. TPAPA was found to readily form an amorphous glass with a glass-transition temperature of 67°C and to exhibit photochromism as amorphous film. Irradiation of amorphous film of TPAPA…
Abstract Effect of several ingredients in the rubber on adhesion characteristics between brass-plated steel cord and rubber was thoroughly investigated. Amine component is generated by N,N'-dicyclohexylbenzothiazole-sulphenamide- (DCBS) accelerated sulfur vulcanization, and it is known to promote stress-induced corros…
Dissipative particle dynamics is an efficient and accurate mesoscale simulation method that bridges the gap between molecular dynamics and continuum hydrodynamics. Using time-staggered algorithms, it can simulate complex liquids and dense suspensions more than 100,000 faster than molecular dynamics.
Increased utilization of synthetic plastics caused severe environmental pollution due to their non-biodegradable nature. In the search for environmentally friendly materials to substitute for conventional plastics, different biodegradable plastics have been developed by microbial fermentations. However, limitations of…
Possible online quantification and calibration methods for capacitive couplers have been investigated experimentally. The purpose of the calibration is to ensure that if two different systems are used to measure the same sample, they measure the same "apparent PD magnitude," which is the charge transfer at the sample…