Materials Literature
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Organized bone ingrowth in endosteal porous implants fabricated from VMC titanium alloy and surgically implanted with a tight interference fit, securely anchored the implants in fresh and healed mandibular premolar sites of miniature swine. This bone-implant union retained its integrity under high as well as slight ma…
Experimental results are presented for the thermal conductivity of P-doped Si over the concentration range 2.5 x 10^14 to 1.1 × 10^18 cm-3 in the temperature region 1.5-50 K. In the low concentration range, phonon scattering by isolated P donors is very weak in contrast with that by Group-V donors in Ge and Li donor i…
When human subjects are irradiated with pulse modulated microwave energy they report the perception of a sound that appears to originate from within or slightly behing the head. Three of the possible mechanisms are examined using first order mathematical approximations and several simplifying assumptions. The results…
This research explores the basic hypothesis that microporosity may play a significant role in the mechanism of breakdown of XLPE cable. The potential improvement achieved by impregnating the cable core with a neutral liquid is evaluated, in relation to ac voltage life and impulse strength. The effect at higher frequen…
The structure and dynamics of “graphon”, a carbon black, have been characterised by a combination of neutron diffraction and inelastic scattering experiments. The techniques employed were those of neutron diffraction, time-of-flight and beryllium-filter spectroscopy.The dimensions of the unit cell were found to be: a=…
The three independent components of the second order Raman spectra of SrTiO3 have been measured at 300 K. They show a strong similarity to the second order spectra of SrO. Very recently, the lattice dynamics1 and the Raman spectra of SrO have been successfully explained on the basis of a nonlinear shell model. It is s…
Abstract Organic volatiles formed in the thermooxidation of polyethylene at 150 and 160°C, 760 torr oxygen pressure were investigated by gas chromatographic analysis. Aldehydes and ketones having a linear chain were identified as the major components of the organic fragments investigated. Their concentration in the ga…
The crystal structure of the title compound (I) has been determined by symbolic-addition and rotation-function procedures and refined by full-matrix least-squares methods to R 0.063 for 568 observed reflections. Crystals are triclinic, space group P, with Z= 2 in a cell of dimensions a= 5.83(2), b= 5.78(2), c= 7.31(2)…
ABSTRACT Rates of lactose crystallization from solutions of constant alpha lactose concentration were determined at temperatures of 15–50°C. Commercially produced crystalline lactose was used as the seed material. Surface integration rather than diffusion of alpha lactose to the crystal surface was the rate controllin…
A wide variety of anodic oxide films were investigated from the photoluminescent point of view. It was found that the phenomenon of photoluminescence appears only on the films anodically formed in organic acids instead of inorganic acids. In particular, thick oxalic acid films formed in low electrolyte concentration,…
The hysteresis characteristics of stabilized Pb(Ti, Zr)3 ceramics are normally described by the introduction of an internal bias field. It is shown that the domain reversals are controlled by this field but that this field does not really exist inside the ceramic grains. A stabilization model describing the field dist…
Weight loss trials, potential'time, and potentiostatic polarisation curves have been used to study the inhibitive properties of zinc gluconate (ZnGl) towards the corrosion of mild steel in sea water. ZnGl completely protects mild steel in stagnant sea water at concentrations ≥ 1 × 10−3 mol/l; at concentrations between…
The applicability of a newly devised technique, based on the Wilhelmy principle, for measuring wetting properties of textile fibers has been demonstrated for a series of wood pulp fibers. The wettability of unbleached kraft, neutral sulfite semichemical (NSSC), and thermomechanical pulp fibers was determined and diffe…
Fine-grained PLZT and TiO2 ceramics subjected to applied electric fields can, depending upon composition and temperature, undergo disorder-order structural transformations that carry the materials from non-polar to polar structures. This paper proposes that the observed transformations are the result of crystallograph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of carboxylate complexes. Crystal structure of (-)598-malatodiaquomanganese(II) hydrateAnastas. Karipides and A. Thomas. ReedCite this: Inorg. Chem. 1976, 15, 1, 44–47Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Publis…
A magnetic study was done precisesly on single crystals of NdCo5 from a standpoint of the spin reorientation (SR). The easy axis rotates continuously from the b‐axis <10⋅0≳ at lower SR temperature (TSR1 at 245 K) to the c‐axis <00⋅1≳ at upper SR temperature (TSR2 at 285 K) in the bc‐plane. The temperature variations o…
A general theory is described for the evaluation of hysteresis and induction torques in rotating machines with unlaminated unslotted rotors using the concept of nonlinear complex permeability. Typical generalised characteristics derived for machines with either solid or tubular rotors show the influence of curvature a…
Four complexes of the bidentate chelating ligand 2-(2′-pyridyl)benzimidazole (pbim) are described: [Fe(pbim)3]-Br2; [Fe(pbim)3][NO3]2·OH2; and [Fe(pbim)3][ClO4]2·xOH2(x= 1 or 2). The complexes have been characterized by Mössbauer spectra (4.2–300 K), susceptibility measurements (80–310 K), solid-state (80–300 K) and s…
The emission, excitation and reflection spectra at 300, 80 and 13 K were obtained. For CaS:Bi 3+ , the green (515 mµ) and orange (588 mµ) emission bands are observed as well as the well-known blue (450 mµ) emission band at 300 K. CaSe:Bi 3+ shows blue-green (500 mµ) and red (645 mµ) emission bands at 80 K. CaO:Bi 3+ s…
Abstract In plastic crystals (“rotary phases”) there is a dynamic disorder of the orientations of the molecules. But reorientations can exist without disorder (jumps between equivalent orientations, e.g. benzene), and on the other hand frozen disorder can be found (exceptions to Nernst principle, e.g. CO). The rate of…