Materials Literature
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Zircaloy in boiling water reactor (BWR) systems often exhibits, besides slight uniform corrosion, a nodular type of corrosion. Highest nodular corrosion was found with materials never β-quenched during their fabrication, whereas β-quenched materials generally showed an improved behavior. Results of nodule thickness me…
The properties of the angle resolved photoemission spectra from nearly free electron (NFE) metals have been investigated for a wide range of electron densities, from K (1.4 × 10 22 electrons/cm 3 ) through Be (24.7 × 10 22 electrons/cm 3 ). These data are used in conjunction with theoretical calculations to illustrate…
In order to determine the deuterium diffusion coefficient in metals, we have developed a new technique, ion driven permeation in which the implantation of energetic ions is utilized instead of gaseous charging or electrochemical charging for deuterium permeation.The time sequence of deuterium permeation rate caused by…
Microstructures of hot work tool steels, AISI H13, HIO, and H19 tempered after quenching at various cooling rates are studied for improvements of the toughness of these steels. It is found that the development of upper bainite with decreasing rate of quenching is accompanied by the following microstructural changes.1)…
Abstract not Available.
The use of a fibrin adhesive to ensure the fixation of skin grafts in difficult situations was evaluated in 27 patients. Fibrin adhesive offers a fast and safe alternative to conventional methods, especially when dealing with concavities or other surfaces where it is impossible to obtain adequate fixation and prevent…
Interface reactions between polyimides and metal/metal oxide surfaces are proposed on the basis of their acid-base strengths. These hypothetical interface reactions are discussed for the purpose of understanding adhesion at these interfaces. Some experimental data are presented to support the hypothesis as it relates…
(1987). The Insertion of ‘Twist’ into Yarns by Means of Air-jets. Part II: Twist Distribution and Twist-insertion Rates in Air-jet Twisting. The Journal of The Textile Institute: Vol. 78, No. 3, pp. 204-219.
Adhesive behaviors of porcelain, quartz and alumina were investigated using a silane coupling agent and ferric chloride together with 4-META/MMA-TBB resin. Using 4-META/MMA-TBB resin, porcelain pretreated with silane and ferric chloride showed bond strength above 20MPa after 2, 000 thermal cycles. Silane primed quartz…
An additive effect on the pressureless sintering of boron carbide is investigated. Some additive species, Al, TiB2, and AlF3 show a remarkable densification effect upon B4C. The Al-addition provides the best sintered body with the highest bulk density of 95% by means of the firing condition of 2200°C for 30min under A…
The uncertainties in the refined parameters for a 1.5-A X-ray structure of carbon-monoxy (FeII) myoglobin are estimated by combining energy minimization with least-squares refinement against the X-ray data. The energy minimizations, done without reference to the X-ray data, provide perturbed structures which are used…
Abstract Recent point defect formation and defect diffusion data in magnetite are used to analyze tracer diffusion data of Fe, Co, Cr and Al for motion enthalpies in vacancy and interstitial(cy) mechanisms. Correlations are made with ion properties such as radius, polarizability, and bond strength. The best correlatio…
The conductivity of rapidly quenched glassy flakes in the system Li4SiO4-Li3BO3 was measured. A maximum conductivity was observed at a composition near 50-60mol% Li3BO3; this behavior can be called the “mixed anion effect”. The enhancement of conductivity was shown to be related to the decrease in the activation energ…
The diffusion coefficient of hydrogen in iron with various interstitial impurity (C, N) contents has been measured at 298 K by an electrochemical permeation method. The diffusivity of hydrogen is significantly reduced by cold-working. In commercially pure iron specimens (high C, N specimens), the diffusivity of hydrog…
The synthesis of tetrameric and hexameric porphyin dericatives is reported; these species can act as models of multi-tetrapyrrole aggregates in biological systems.
For the first time, expressions are presented which enable us to calculate the reorientation of the nematic director under the influence of an applied voltage of any magnitude. The mathematical techniques developed are extended to study the capacitance of a nematic layer under any magnitude of applied voltage. The cal…
The crystal structures of three six-co-ordinate iron(III) complexes; [Fe(saltrien)] Br·2H2O (low-spin)(1), [Fe(saitrien)]BPh4(spin-crossover)(2), and [Fe(saitrien)]PF6(spin-crossover)(3) have been determined by X-ray analysis at 293 K, where H2, saitrien denotes the Schiff base derived from salicyiaidehyde and triethy…
The form of ferroelectric smectic C* electrooptical response vs the layer thickness and the angle β between the polarizer and analyser is investigated. The criterion of the smectic C*-switching rate is propozed and the method for the rotational viscosity measurements is developed.
Affinement de la structure des composes non stœchiometriques Ca 12−x Al 14 O 33−x jusqu'a 10,53% pour Ca 11,3 Al 14 O 32,3 . Affinement de la structure de CaClO(D 0,88 H 0,12 ) jusqu'a 19,6%, valeur elevee a cause de la presence de l'impurete H
Recent examinations of cold-worked Zircaloy-2 and cold-worked Zr-2.5Nb pressure tubes from CANDU-PHW reactors have extended the corrosion and deuteriding data for these materials up to 5600 effective full power days (efpd), the longest published exposure for these materials in reactor. The examinations have demonstrat…