Materials Literature
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During fracture of ceramics containing tetragonal zirconia particles, a volume of zirconia material on either side of the crack irreversibly transforms to the monoclinic crystal structure. Transformation zone sizes, measured using Raman microprobe spectroscopy, are presented for three sintered ceramics. In a single‐ph…
We consider capillary displacement of immiscible fluids in porous media in the limit of vanishing flow rate. The motion is represented as a stepwise Monte Carlo process on a finite two-dimensional random lattice, where at each step the fluid interface moves through the lattice link where the displacing force is larges…
This paper describes the chemical and mineralogical characteristics which must show the blas-furnace slags to be used in cement manufacture or to be added to concrete. There are also shown technical and economical details concerning manufacture and use of blast-furnace slag cements. Methods to control the quality of s…
In the field of energy saving, mainly thermic, in the cement industry, not only should we consider the possibilities in the technological process or the finished product, but also the influence of the chemical-mineral composition of the raw materials. The distinct parameters which fall into the reactivity of the crude…
This paper shows some deficiences of the Spanish Standard Method UNE 7245 and the corresponding deficiences of the Spanish Concrete Code EH-SO adopting it. According to the actual Method, erroneous low values may result in determining sulphides and in general sulphur compounds in cocrete aggregates. Attention is drawn…
In this work, a continuation of others, DRX studies the evolution of the structural characteristics of the enriched fraction (hydrated-attacked cement) extracted from one of the mortar prisms (1:3) o/ 1 x 1 x 6 cm of the different series manufactured with Portland cement of initial high resistance and with mixtures of…
The different forms of superficial alteration that appear on the stones of the Oviedo Cathedral are described and localed, in this part of the paper. The more common phenomena of deterioration of the monument are also defined, stressing on the crusts.
We present the results of Monte Carlo simulations of the two-dimensional Lennard-Jones system. The energy, pressure, structure factor, elastic constants, and $〈{u}^{2}〉$ have been computed at several temperatures along three isochores. In addition, we have studied the distribution of disclinations and dislocations on…
Abstract The broad charge heterogeneity typical of nearly all smectites is not necessarily characteristic of vermiculites. In addition to vermiculites with pronounced heterogeneity, minerals with no or only limited charge heterogeneities are known. Layer charge and charge heterogeneity of 25 vermiculites were determin…
The reproducibility of the pulsed ultrasound technique for the determination of skin thickness was investigated, using two independent observers. No systematic difference was found and a high correlation was obtained. Studies were also undertaken to validate the pulsed ultrasound technique as a measure of true skin th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical effects of ultrasound on aqueous solutions. Evidence for hydroxyl and hydrogen free radicals (.cntdot.OH and .cntdot.H) by spin trappingKeisuke Makino, Magdi M. Mossoba, and Peter RieszCite this: J. Am. Chem. Soc. 1982, 104, 12, 3537–3539Publication Date (Print):Jun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of interfacial electron-transfer processes in colloidal semiconductor systemsDuonghong Dung, Jeremy Ramsden, and Michael GraetzelCite this: J. Am. Chem. Soc. 1982, 104, 11, 2977–2985Publication Date (Print):June 1, 1982Publication History Published online1 May 2002P…
Experimental results and model ideas on the structural organisation of different forms of condensed carbon are critically reviewed from the standpoint of polymer science. Stress is laid on the role of chemical bonds between molecules (branching points) and of lamellar and other supermolecular formations in the multi-s…
Co-doped LEC InP was studied using resistivity and Hall measurements, thermal and optical capacitance spectroscopy, photoluminescence (PL) and PL-excitation (PLE) techniques. The derived activation energy for n-type conduction is about 0.50 eV in semiinsulating InP:Co samples of resistivity 10 6 to 10 7 Omega cm. The…
Almost 15 years have passed since carbynes entered the literature as new forms of elemental carbon. They recently attracted attention as possible interstellar dust constituents and as carriers of presolar noble gases in meteorites. Their existence and that of the related mineral chaoite are questioned, and a reevaluat…
The epidermis of live human skin has a permanent electric dipole moment perpendicular to its surface. Voltage responses to a rapid change of temperature are pyroeletric, while voltage responses to pressure pulses are piezoelectric in nature. The time course of the responses depends on dX/dt (X, temperature or pressure…
It is shown that the linearity of a piezoelectric ceramic actuator may be greatly improved if the applied electric charge, rather than the applied voltage, is varied to control the extension. Hysteresis is virtually eliminated.
Several elastic constants of the perovskite-type layer-structure compound (CH 3 NH 3 ) 2 FeCl 4 have been measured. The anomaly of the C 66 mode and the lambda -type heat capacity near the structural phase transition from the tetragonal high-temperature phase to the orthorhombic room-temperature phase gave the critica…
Observations of stable, freely suspended liquid-crystal strands are reported. Liquid crystals of triphenylene hexa-$n$-dodecanoate can be stretched into strands of diameter \ensuremath{\gtrsim}1 \ensuremath{\mu}m, with the disk-shaped molecules arranged into columns along the strand axis. In the $D1$ phase ($T<110\…