Materials Literature
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Abstract The positions of 13 non‐hydrogen atoms in the structure of kaolinite from Keokuk, Iowa, were refined in the space group C1 using the constrained X‐ray Rietveld refinement. The precision and accuracy of the atomic positions are better than those previously reported. The most frequent e.s.d.'s of the positional…
SUMMARYChemical composition and fabrication procedures determine the microstructure of any wrought aluminium alloy product in terms of size and distribution of grains, subgrains and intermetallic particles. The influence of these microstructural features in the near-surface region on the surface behaviour during pretr…
In the environmental scanning electron microscope (ESEM), the electron beam together with various signals emanating from the beam-specimen interaction ionize the gaseous medium in the specimen chamber. A detailed derivation of equations describing the charge density and current flow in the system is presented. It is s…
The surface discharge phenomena on 1-10 mm-thick acrylic plates were investigated under positive impulse voltage in air at atmospheric pressure. The corona inception voltages and the flashover voltages were measured, and the discharge phenomena were observed with an image converter camera. As a result of this study, v…
The dissolution of cellulose in CuII–amine solvents, and the subsequent gelation of these solutions with concentrated NaOH solution, have been studied with ESR and optical absorption spectroscopies. A CuII–cellulose complex has been characterised in homogeneous CuII–cellulose gels. This species is similar to that form…
The desorption of hydrogen from NdFeB powder and unmilled material produced using hydrogen decrepitation as a premilling technique was investigated using a mass spectrometer to monitor the hydrogen partial pressure in the system as the sample was heated under vacuum from room temperature to approximately 1000 degrees…
ince high-resolution electron micrographs of dodecagonal Ni-Cr quasicrystals are similar in contrast to those of several closely related periodic phases, it has been argued that dodecagonal quasicrystals can be described as a decoration of a dodecagonal quasiperiodic tiling with the same structural units as occur in t…
Abstract Erstmals wurde Ba 3 In 2 O 5 Cl 2 dargestellt und mit Röntgenmethoden an Einkristallen untersucht. Es kristallen untersucht. Es kristallisiert tetragonal, Raumgruppe D –I4/mmm mit a = 4,236; c = 24,929 Å, Z = 2. Die Kristallstruktur entspricht dem Aufbau von Sr 3 Ti 2 O 7 . Die Oktaeder‐doppelschichten dieses…
Abstract Following a re-examination of several published methods for the preparation of ammonium hexavanadate, single crystals of (NH 4 ) 2 V 6 O 16 have been grown by a reaction of V 2 O 5 with NH 4 Cl in hot aqueous solution. They are monoclinic, space group P 2 1 /m , with a = 7.858(2), b = 8.412(2), c = 4.995(1) Å…
Abstract Impedance and photoelectrochemical studies have been carried out with AISI 316L stainless steel and Ti–6Al–4 V alloy immersed in simulated extracellular fluid with and without lactic acid additions. The latter was used to simulate the metabolic products associated with infection. Maximal space charge thicknes…
A one-dimensional, multicell, Eulerian finite difference computer code (MELTSPREAD-1) has been developed to provide an improved prediction of the gravity driven spreading and thermal interactions of molten corium flowing over a concrete or steel surface. In this paper, the modeling incorporated into the code is descri…
Thermal analysis embraces a group of analytical methods in which a physical property - e.g. enthalpy, mass, volume or birefringence - is measured as a function of temperature. This paper briefly presents differential scanning calorimetry (DSC), differential thermal analysis (DTA), thermogravimetry (TG), thermal mechan…
Abstract This article is a compilation of property data for standard grades of wrought magnesium and cast magnesium alloys. Data are provided for mechanical, physical, thermal, and electrical properties. Valuable information is provided regarding the applications, chemical compositions, relevant specifications, fabric…
The three-dimensional architecture of filamentous components in the lamina densa of the Schwann cell basement membrane was studied in the mouse sciatic nerve by transmission and scanning electron microscopy after osmium-maceration treatment, and also by conventional electron microscopy. In conventionally prepared spec…
The three-dimensional microstructure of Tolypothrix mats from the bottom of a maritime antarctic lake of Signy Island, South Orkneys, was examined. Samples from mats at two depths, 4 and 6 m, within the lake were taken by scuba divers and frozen (−80 °C) in March 1987. The samples were freeze-fractured and examined by…
A simulated thin-film transistor (TFT) circuit has been built to drive the twisted nematic (TN) cell for the measurements of charge retention and the transmission versus peak voltage applied to the drain electrode of the simulated TFT using the gate pulse width as a parameter. The established rule that the transmissio…
A new antibiotic SF2487 has been isolated from the culture broth of Actinomadura sp. SF2487. The structure of antibiotic SF2487 was determined by spectroscopic analyses of the sodium salt and X-ray diffraction analysis of the silver salt. The antibiotic represents a new member of polyether group antibiotics known as t…
Many of teleosts are known to have Type I collagen with subunit structure of α1α2α3. Carp, however, is exceptional in that an α3 chain is absent from the swim bladder Type I collagen, but is present as a minor subunit in the skin Type I collagen. In this study, the skin α3 chain of carp was isolated by CM-cellulose ch…
The temperature rise in the substrate as well as in the bulk solution and the development of a local brown-coloured 'burnt' region on the anodic film are the characteristics of high rate anodizing of aluminum in oxalic acid. In this study, measurement of the barrier layer thickness in both the predicted burning region…
Ni modified Ti–6Al–4V alloy has been investigated under uniaxial test conditions at different temperatures 1023∼1103 K and at strain rates in the range of 5×10−5 to 5×10−3 s−1. The maximum elongation (about 422%) was found to occur at 1088 K and a strain rate of 2.0×10−4 s−1. There was evidence of strain hardening or…