Materials Literature
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The effect of Si addition on the nucleation and growth of the grain boundary cell in a Cu-10%Ni-8%Sn alloy on aging at 723 K after quenching from 1123 K were investigated by means of hardness measurements, optical and electron microscopic observations, and X-ray analysis. The addition of Si retarded the precipitation…
The purpose of this paper is to investigate the influence of grain size and temperature on fracture toughness of MgO sintered bodies, Specimens were made by hot pressing, and a wide range of grain size (12-230μm) was obtained by annealing at high temperatures. Porosities of specimens were less than 1%. Fracture toughn…
The present study aims to assess whether the smectite‐rich Cochin and Mangalore clays, which were deposited in a marine medium and subsequently uplifted, exhibit consistency limits response typical of expanding lattice or nonexpanding (fixed) lattice‐type clays on artificially changing the chemical environment. The ch…
Thermophysical and kinetic properties of the LaNi5-H2 system are investigated for the practical utilization of hydriding alloys. The measurements of the thermophysical properties are carried out by a transient hot-wire method along the P-C isotherms. The effective thermal conductivities of the system increase not only…
The first magneto-optical study of the 4 A 2g → 2 T 2g absorption, 2 E g → 4 A 2g and 2 T 2g → 2 T 1g, 2 E g luminescences of MoCl3- 6 in Cs2NaYCl6, as well as the absorption spectrum of the spin-allowed 4 T 2g and 4 T 1g ligand field states, are reported. Magneto-optical methods have allowed difficulties in a previou…
Abstract This article describes the zinc and zinc alloys for decorative and functional applications. It focuses on the types of zinc coatings, namely, hot dip galvanizing, electrogalvanizing, metallizing, and mechanical galvanizing. The article covers the uses of zinc alloy castings, including pressure die castings, a…
About 60 years ago it was first realised that grain boundaries in crystalline solids were preferential pathways for diffusion, especially at relatively low temperatures. This paper traces the main developments in the field from its inception to the present day. Particular emphasis is placed on experimental methods and…
Single crystals of optical quality of LiNO 3 , NaNO 3 , KNO 3 , CsNO 3 , AgNO 3 and TlNO 3 have been grown from aqueous solutions. Their elastic and thermoelastic constants were determined from ultrasonic resonance frequencies of thick plates and from temperature-induced shifts of resonance frequencies. For NaNO 3 and…
A practical conversion factor to estimate the value of effective dose equivalent rate in Sv unit from absorbed dose rate in air in Gy unit was examined for natural gamma radiations. The experimental examination was carried out by two methods; one measures the effective dose equivalent rate directly by using a measurin…
Truss models have been developed and applied to the ultimate strength design and detailing of two‐dimensional reinforced concrete members loaded in their plane. Such a truss is composed of struts and ties which represent one‐dimensional stress fields. The nodes, however, form two‐dimensional stress fields whose bearin…
Our recent spin trapping studies of free radical generation by ultrasound in aqueous solutions are reviewed. The very high temperatures and pressures induced by acoustic cavitation in collapsing gas bubbles in aqueous solutions exposed to ultrasound lead to the thermal dissociation of water vapor into H atoms and OH r…
Abstract Small‐angle light scattering was employed as a nondestructive technique for the in situ observation of swelling of PVC particles during gelation and fusion. One typical plastisol grade of PVC and three different plasticizers were used. The results demonstrate that quantitative measurements of average PVC part…
El establecimiento de las características texturales de carbones es esencial para su utilización en procesos industriales. La evaluación de la textura porosa de carbones se suele realizar mediante adsorción de gases y vapores. Por esta razón, en este libro se pretende plantear las principales estrategias más generalme…
Novel stress transducers of simple construction are described, which can easily be formed into arrays with a great reduction in interconnections relative to discrete strain gauges. Their frequency response extends to DC, and the arrays lend themselves to measuring distribution of pressure or shear at interfaces betwee…
The proposed approach is based on the unique property that the ratio of the real to the imaginary parts of the susceptibility or of the polarization decrement are independent of frequency in the respective frequency ranges. The resulting energy criterion is discussed, and a screened polarization model and mechanical r…
During fast-particle irradiation significant fluxes of point defects can be set up adjacent to sinks such as surfaces or internal grain boundaries. In general, the different atomic species in an alloy move at different rates in response to these point-defect fluxes so that some species move towards sinks while others…
The effects of Si addition on the nucleation and growth of the grain boundary cell in a Cu-10%Ni-8%Sn alloy on aging at 723 K after quenching from 1123 K were investigated by means of hardness measurements, optical and electron microscopic observations, and X-ray analysis. The addition of Si retarded the precipitation…
The impact strength depends on both the size and the shape of filler and is also affected by micromorphology. Poor impact strength is correlated with a high capacity for nucleation of cristallisation.
The authors present a comparison between results predicted by four mathematical models of hysteresis and experimental data measured on a CoNiCr alloy for longitudinal recording. Two of those models are simple analytical formulas and can be used in a first approach to the phenomena, but are deficient in terms of modeli…
Seam pucker can only be assessed subjectively, by using photographic standards, since instrumental techniques have so far failed to produce accurate results. A low cost means of predicting the degree of pucker has been provided, by correlating measured values of fabric and thread mechanical properties and geometrical…