Bone-bonding properties of Ti metal subjected to acid and heat treatments

The effects of surface treatment on the bone-bonding properties of Ti metal were examined by both mechanical detaching test and histological observation after implantation into rabbit tibiae for various periods ranging from?4 to?26?weeks. The bone-bonding ability of Ti metal, which is extremely low as it is abraded, was hardly increased by simple heat treatment at 600?°C or treatment with H₂SO₄/HCl mixed acid alone, but was markedly increased by the heat treatment after the acid treatment. Even Ti metal that had been previously subjected to NaOH treatment showed considerably high bone-bonding ability after acid and heat treatments. Such high bonding abilities were attributed to their high apatite-forming ability in the body environment. Their high apatite-forming abilities were attributed to a high positive surface charge, and not to the type of crystalline phase or specific roughness of their surfaces. The present study has demonstrated that acid and subsequent heat treatments are effective for conferring stable fixation properties on Ti metal implants.     

Optimization of the Gaussian and Jeffreys Power Priors With Emphasis on the Canonical Parameters in the Exponential Family

Behaviormetrika - Optimal powers of the Gaussian and Jeffreys priors are obtained so that they minimize the asymptotic mean square error of the linear predictor and the sum of the asymptotic mean...     

Flavor production from edible oils and their constituents by Penicillium corylophilum

Production of volatile substances from edible oils and their constituents by Penicillium corylophilum was studied to clarify the mechanism of flavor production from a non-stick oil by the organism in a rice cake system. First, edible oils from plant and animal origins were tested for flavor production. Among the oils tested, coconut oil was the only one from which the flavor was produced. Second, triacylglycerols consisting of fatty acids with various lengths of carbon chain (C6 to C13) were studied for flavor production. Among the triacylglycerols tested, flavors were produced from those consisting of fatty acids with carbon chains of C6 to C11. The flavors consisted of methylketones and secondary alcohols, whose carbon chains were one carbon shorter than the precursor fatty acid molecules of the triacylglycerols. Flavors similar to that from the non-stick oil were produced from tricaprylin (C8), trinonanoin (C9), and tridecanoin (C10) among the triacylglycerols tested. Formation of mould spores was more strongly suppressed by triacylglycerols with shorter chain fatty acids. Third, fatty acids with various lengths of carbon chain (C7 to C15) were studied for flavor production. Among the fatty acids tested, flavors were produced from decanoic (C10) and undecanoic (C11) acids only. The flavors also consisted of methylketones and secondary alcohols one carbon shorter than the precursor fatty acids. Fatty acids with short carbon chains (C7 to C9) completely inhibited the mould growth. Our study showed that the range of carbon chain length of fatty acids capable of the flavor production (C10 to C11) was narrower than that of triacylglycerols (C6 to C11). It was also found that the non-stick oil and coconut oil contain tricaprylin and tridecanoin as triacylglycerols and decanoic acid as fatty acid.     

An Improved 6-μm Green Sheet for a High-Capacitance Multilayered Ceramic Capacitor

Binder systems for 6-m green sheets to be used for high-capacitance multilayered ceramic capacitors (MLCs) have been examined. Green sheets with a polyvinyl butyral (PVB) binder consisting of only a single molecular weight (52,000) are unsuitable for such MLCs because extreme deformation occurs during the shaping of green MLC blocks. Thus PVB binder systems with a wide distribution of molecular weight (made by combining PVB with molecular weights 19,000, 52,000, and 110,000) have been investigated and 2.2 F MLCs successfully fabricated. In preparing the slurries, 52,000 and 110,000 molecular weight PVBs were also compared as dispersants. In the final slurries investigated, those with the lower molecular weight (52,000) PVB as a dispersant had a better stability.     

Noncritically phase matched mid-infrared generation in AgGaSe2

A tunable mid-infrared optical parametric oscillator has been demonstrated using a noncritically phase matched AgGaSe₂ crystal with pump wavelength tuning. Average power experiments have generated several hundred milliwatts of 2.63 and 3.71 μm radiation using a high-repetition-rate, multiwatt 1.54 μm pump source. Interferometric measurements of the AgGaSe₂ crystal during operation indicated only minor thermal lensing     

Design of general user interface for automatic service composition

Automatic web service composition provides new value-added services dynamically to compose existing services. Paik proposed logical and physical web service composition and ontologies for this. A useful composer needs well-defined web interface for general users. A general user interface is designed and implemented in this paper. The user interface generates some HTML form based on the ontology and additional HTN ontology.     

A Neural Chaos Model of Multistable Perception

We present a perception model of ambiguous patterns based on the chaotic neural network and investigate the characteristics through computer simulations. The results induced by the chaotic activity are similar to those of psychophysical experiments and it is difficult for the stochastic activity to reproduce them in the same simple framework. Our demonstration suggests functional usefulness of the chaotic activity in perceptual systems even at higher cognitive levels. The perceptual alternation may be an inherent feature built in the chaotic neuron assembly.     

Coherent Response in a Chaotic Neural Network

We set up a signal-driven scheme of the chaotic neural network with the coupling constants corresponding to certain information, and investigate the stochastic resonance-like effects under its deterministic dynamics, comparing with the conventional case of Hopfield network with stochastic noise. It is shown that the chaotic neural network can enhance weak subthreshold signals and have higher coherence abilities between stimulus and response than those attained by the conventional stochastic model.