Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract Tool steels are any steel used to make tools for cutting, forming, or shaping manufactured parts. Most tool steels are wrought products alloyed with relatively large amounts of tungsten, molybdenum, vanadium, manganese, and/or chromium. The article describes a wide variety of tool steels, including high-speed…
Abstract Basket‐shaped hosts were synthesized starting from the concave building block 4 magnified image To this end, oligo(oxyethylene) bridges, containing different aromatic rings, were attached to the 3,6‐ and 3′,6′‐positions of the xylylene rings of 4 . These bridges include 5,6‐benzo‐1,4,7,10‐tetraoxadec‐5‐ene, 5…
Abstract Rheological studies of an experimental liquid crystalline (LC) copolyester were carried out using a capillary rheometer and a cone and plate rheometer. Rheological characteristics of the polymer in the nematic state were observed. The nematic melt was found to be pseudoplastic and the degree of pseudoplastici…
The title ligand and a C-functionalised analogue have been prepared; the ligand is very strongly basic [pKa LH+, LH2+ < 14 (298 K)] and forms remarkably stable complexes with yttrium and calcium.
Abstract
The changes induced in some titania-supported iron–ruthenium and iron–iridium catalysts following pretreatment in hydrogen have been examined in situ by 57Fe Mössbauer spectroscopy. Fe3+, which is formed in the supported metallic phase by initial treatment in air, undergoes partial reduction when treated in hydrogen a…