Materials Literature
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Abstract Metakaolins formed by total dehydroxylation of kaolinite, dickite and nacrite were hydrothermally treated at 240 ° C, for 2, 21 or 182 days, at initial pH = 5– 6 or 1. Kaolinite was the only mineral of the kaolin subgroup crystallized in these treatments. Kaolinite is less ordered for pH = 4– 6 than for pH =…
Temperature-dependent optical absorption of cerium-doped gadolinium oxyorthosilicate (Gd2SiO5:Ce) has been measured and analyzed for impurity-ion-lattice coupling parameters and oscillator strengths. Although the spectrum consists of overlapping Ce3+ bands and Gd3+ lines, two well-resolved Ce3+ bands with 10 K maxima…
[Galuskin & Galuskina (2000)][1] seem unaware of the requirements for defining and naming a new mineral species. These requirements are set out in detail by the Commission on New Minerals and Mineral Names of the International Mineralogical Association, and were adhered to exactly by [Groat et al. (
Microdisplays made from ferroelectric liquid crystals (FLCs) and silicon integrated circuits offer exceptionally high resolutions along with the capability for single-panel sequential color. The binary pixels of these microdisplays are capable of full gray scale through the use of techniques that involve illumination…
The formation and migration of vacancies in (1121) twin boundaries in α-Ti and α-Zr are studied by computer modelling. Three empirical central force potentials constructed within the embedded-atom method are used to represent atomic interactions. Minimum-energy structures for the grain boundary are found first and the…
Abstract Four “gemini”-type cholesterol-based gelators 1n were synthesized. They acted as versatile gelators of organic fluids. The xerogels show lamellar structures for 12 and 14 and fiber structures for 13 and 15 according to the even or odd number of alkyl chains between two nitrogens. The difference in these organ…
This paper describes the microbial production of polyhydroxyalkanoates (PHAs) from food industry wastes by a mixed culture of activated sludge microorganisms. The physical and chemical properties of the bioplastics produced by the microorganisms from malt and soy wastes were different. The melting points of the produc…
A monitoring instrument with novel porous silicon humidity sensors is presented. The sensors feature a humidity-sensitive capacitor with a porous silicon dielectric, as well as two on-chip integrated thermoresistors and a refresh resistor. The capacitance variation upon water uptake is here modelled with an effective…
Abstract Polypropylene containing comminuted fiber reinforced thermoset recyclate has been shown to exhibit enhanced mechanical properties relative to particulate‐filled materials. Optimum mechanical performance in these recyclate‐filled materials is achieved in compositions made from rubber‐modified polypropylene con…
PETI-5 (5000 g mol −1) is a relatively new adhesive and composite matrix that exhibits good processability and excellent properties. However in the fabrication of complex composite parts (i.e. skin stringer and support frames), better processability would offer distinct advantages. In an effort to improve the processa…
Waterborne polyurethane dispersions (PUDs) continue to show growth in commercial usage due to the ever increasing environmental legislation to reduce VOC in coating and adhesive materials. The transition from solvent‐based to waterborne has also been facilitated by advances in both the chemistry and technology employe…
The hydratase-aldolase-catalyzed conversion of trans-o-hydroxybenzylidenepyruvate to salicylaldehyde and pyruvate is an intermediate reaction in the conversion of naphthalene to salicylate by bacteria. Here, a variety of aromatic aldehydes and some nonaromatic aldehydes together with pyruvate have been shown to be sub…
A full scale three-phase multi-stress accelerated electrical aging test facility for stator bars is described. Electrical aging characteristics may be determined under simultaneous electrical, mechanical and electrical stress at either 60 Hz or an accelerated frequency of 400 Hz. Typical initial aging data are present…
The phase evolution of lead titanate processed by the polymeric precursor method was investigated by thermal analysis, X‐ray diffraction, and high‐resolution transmission electron microscopy. The results showed that the cubic perovskite PbTiO 3 (PT) phase is formed from an inorganic amorphous precursor at a temperatur…
Pr2Te2O7: Ein Praseodym(III)-Oxid-Oxotellurat(IV) gemäß Pr2O(TeO3)2 mit Pyrochlor-Struktur Bei Versuchen zur Darstellung von Pr2O2Te durch Umsetzung von elementarem Praseodym mit Tellur(IV)-Oxid (TeO2) im molaren Verhältnis von 2 : 1 bei 850 °C in evakuierten Quarzglasampullen kam es gelegentlich zu unkontrollierten L…
The skin of golfers' hands provides a suitable model to study the effect of chronic sun exposure, because one of their hands is exposed to the outer environment, especially sunlight, while the other one is always protected by a glove during play. Our purpose was to find out the influence of photodamage on the properti…
Radiation doses to both the fingertip and finger base of staff preparing radiopharmaceuticals in a radionuclide dispensary have been monitored for more than 5 years. The records show a fall in dose thought to be due, largely, to the introduction of all-glass (lead) syringe shields. In 1998, the annual radiation dose (…
Data acquisition packages developed at different small angle scattering facilities use different formats both for raw and processed data storage. To facilitate the data exchange between laboratories, a consensus in the small angle scattering community has been reached on an ASCII format for one-dimensional data which…
Degumming with 25% (owO Marsei lle's soap for 1. 5 h at boil gives a weight loss of20.5 %, whereas degumming with enzyme (3 mllg of fabric) at 37()C for 3 h gives a weight loss of about 19.8 %. Treatment with enzyme requires much lower temperature than that in the conventional process. Processing of silk with enzyme u…
In order to improve the biochemical reactivity of the cellulose polymer, which is mainly attributed to the presence of surface hydroxyl groups, derivatized cellulosic membranes have been engineered replacing or masking some or all of the hydroxyl groups in the manufacturing process of the membrane. The present study w…