This work focused on the influence of processing conditions on the mechanical properties of polypropylene (PP) and PP/mesoporous silica-hydroxyapatite (PP/MCM-41-HA) hybrid nanocomposites. The mechanical properties of PP were enhanced by adding MCM-41-HA nanoparticles. Neat PP and hybrid nanocomposites based on PP, containing maleic anhydride-grafted polypropylene (PP-g-MA) and MCM-41-HA, were ...

Measurements of fallout radioactivity in Greenland in 1977 are reported. Strontium-90 (and Cesium-137 in most cases) was determined in samples of precipitation, sea water, vegetation, animals, and drinking water. Estimates are given of the mean contents of 90Sr and 137Cs in the human diet in Greenland in 1977.

Hopf bifurcations have been studied intensively in two dimensional vector fields with one slow and one fast variable [É. Benôıt et al., Collect. Math., 31 (1981), pp. 37–119; F. Dumortier and R. Roussarie, Mem. Amer. Math. Soc., 121 (577) (1996); W. Eckhaus, in Asymptotic Analysis II, Lecture Notes in Math. 985, Springer-Verlag, Berlin, 1983, pp. 449–494; M. Krupa and P. Szmolyan, SIAM J. Math....

Mathematical programs with equilibrium (or complementarity) constraints, MPECs for short, form a difficult class of optimization problems. The feasible set has a very special structure and violates most of the standard constraint qualifications. Therefore, one typically applies specialized algorithms in order to solve MPECs. One prominent class of specialized algorithms are the relaxation (or r...

Abstract In Fe 3 O 4 nanopowders were carried out microwave absorption measurements at X-band (8.8-9.8 GHz), in the 89-300 K temperature range, by means of ferromagnetic resonance (FMR), magnetically modulated spectroscopy (MAMMAS) and low-field (LFMA). The Verwey transition around T v ∼ 137 has been detected employed FMR parameters: resonant field ( H res ) linewidth ΔH pp ), as function. MAMM...

Proceedings SWAT 88, First Scandinavian Workshop on Algorithm Theory. Lecture Notes in Computer Science, vol. 318, pp. 176–189. Halmstad, Sweden (1988) 3. Baeza-Yates, R., Schott, R.: Parallel searching in the plane. Comput. Geom. Theor. Appl. 5, 143–154 (1995) 4. Blum, A., Raghavan, P., Schieber, B.: Navigating in Unfamiliar Geometric Terrain. In: On Line Algorithms, pp. 151–155, DIMACS Series...

UNLABELLED In uncontrolled clinical studies, ursodeoxycholic acid (UDCA) had a beneficial effect on nonalcoholic steatohepatitis (NASH). However, a large controlled trial using UDCA (13-15 mg/kg/day) was unable to confirm these results. Accordingly, a randomized, placebo-controlled study was initiated with a high dose of UDCA (23-28 mg/kg/day). The allocation of patients and the evaluation of l...

PP-g-PS copolymer is a typical compatilizer used in polypropylene and polystyrene immiscible blends. PP-g-PS copolymers with different side chain lengths were synthesized, and their thermal and mechanical properties were characterized by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and dynamic mechanical analysis (DMA), respectively. The DSC and POM results show ...