Materials Literature
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Abstract The fracture toughness of semicrystalline nylon 6, amorphous nylon 6IcoT, and their blends can be represented as the inherent toughness plus the toughness due to the formation of the crack tip plastic zone. The inherent toughness originates mostly from the molecular alignment near the crack tip plus a small c…
Abstract The interaction of simulated nuclear waste borosilicate glass with acid solutions (pH = 2, pH = 4) was studied under static conditions (i.e. without refreshment of corroding solution) at 30, 60 and 90°C. Tests with stirred and unstirred solution were compared. The rate of glass dissolution (given by the rate…
Abstract Silicate and germanate glasses studied by X‐Ray diffraction methods (WAXS) show characteristic features concerning the first peak of their scattering functions (FSDP: first sharp diffraction peak). Shapes and positions of the FSDPs develop systematically with composition. The shape of the FSDPs can only be de…
Geothermal energy is an alternative renewable energy resource that has proven itself technically and economically feasible as a nonpollulanl electric power source. The Denizli-Kizildere geothermal energy region is the first major geothermal energy resource project in Turkey, with an estimated potential of 200 MW. The…
Abstract The effect of a magnetic field on the hydrogenic shallow donor impurity is investigated with the use of a variational method. Two different expressions describing the photoionization cross‐section for donor‐conduction band transitions are obtained both in absence and presence of an applied strong magnetic fie…
Cast duplex stainless steels are known to be susceptible to embrittlement after long term ageing at intermediate temperatures (300-400°C). This embrittlement is related to the spinodal decomposition that occurs in the ferrite phase. Steels of equivalent composition after undergoing the seemingly same heat treatment ex…
High temperature X-ray diffraction and quenching experiments of mullite single crystals with Al2O3:SiO2 ratio 2:1 have been performed to investigate the stability of the oxygen vacancy ordering close to the melting point of mullite. The experiments show that the structure of mullite exhibits an extremely stable, tempe…
Abstract Smectites are a major mineral group often found in the clay fraction of soils. Our objective was to evaluate the effect of pedologic environments on smectites in the arid Carrizo Plain, California. Six pedons (one Argixeroll, three Haploxeralfs, one Natrargid, and one Salorthid) were described and sampled alo…
Abstract Fe 2 O(SeO 3 ) 2 , frequently obtained in various chemical systems by low-hydrothermal treatment of SeO 2 and FeC 2 O 4 · 2 H 2 O, has been investigated using single-crystal X-ray diffraction. Crystal data (at room temperature): space group Pccn , a = 6.639(2) Å, b = 12.839(4) Å, c = 13.266(4) Å, V = 1130.8(6…
The reforming of a paraffinic naphtha was studied in order to determine the influence of chlorination during the run. Experiments were performed at 505°C, 15 kg cm−2, WHSV = 4, H2: HC= 4, and with or without an 8 h initial period of deactivation at 1 kg cm−2. A commercial Pt–Re/Al2O3 (0·3% Pt, 0·3% Re, 0·04% S, 0·15%…
Poly(ether ether ketone) and poly(ether diphenyl ether ketone) homopolymers are prepared by nucleophilic substitution routes. Miscibility of PEEK/PEDEK blends has been studied by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (d.s.c.). The results indicate that for PEEK/PEDEK blends, when th…
Studies have been carried out on polyurethane elastomers based on modified castor oil in combination with different molecular weights of polyethylene glycol and polymeric methylene diphenyl-4,4′-diisocyanate (PMDI). The resulting polymers were cast into molds and the moldings were characterized by scanning electron mi…
Abstract A new water‐insoluble polysiloxane containing pendant Ru(bpy) (bpy = 2,2′‐bipyridine) was studied with respect to the photoluminescence and its quenching by dioxygen. The emission was quenched by O 2 in water more efficiently than in gas phase, and the Stern‐Volmer plots showed a downward deviating curve. To…
Particle statistics in quantitative X-ray diffractometry relates to the number of particles (crystallites) contributing to the diffracted intensity for a given line. Variations in line intensity between replicate preparations of the same sample arise from statistical variations in the number of diffracting particles.…
Adducts [( dmso )nLn(O2NO)3], obtained by the crystallizatior , of lanthanoid (III) nitrate ( Ln (NO3)3.-xH2O) with excess dimethyl sulfoxide (' dmso ') in methanol or ethanol, have been the subject of a series of room-temperature single-crystal X-ray studies, defining more clearly the manner in which stoichiometry an…
SHOCK®: Injury, Inflammation, and Sepsis: Laboratory and Clinical Approaches includes studies of novel therapeutic approaches, such as immunomodulation, gene therapy, nutrition, and others. The mission of the Journal is to foster and promote multidisciplinary studies, both experimental and clinical in nature, that cri…
In PbTiO 3 (2.2–398 nm in thickness)/Pt/MgO(100) structure, the dependence of the crystalline structure and lattice parameters of PbTiO 3 thin films on the film thickness was investigated using the θ-2θ XRD method and the energy dispersive typed total reflection X-ray diffraction method (ED-TXRD). By using the ED-TXRD…
Abstract Flexible clear PVC compounds tend to yellow and darken during and after exposure to gamma radiation. This has been an obstacle to their use in the medical market. The purpose of this investigation was to improve the gamma stability of flexible PVC. The variables of interest were resin molecular weight, plasti…
Multishell carbon nanotubules are studied by means of diffraction contrast dark field images. This results in an electron microscopy method for the determination of the sign of the chiral angles in carbon nanotubes. The method is justified by a reasoning either in direct space or in diffraction space. We also investig…
Abstract The morphology of the dispersed phase in immiscible polymer blends can have a significant effect on the final may be omitted physical properties. Laminar dispersion of an ethylene vinyl alcohol copolymer (EVOH) with high oxygen barrier properties was obtained in the matrix of low density polyethylene (LDPE) w…