Abstract:
A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.
Abstract:
An apparatus and method are provided for analyzing information relating to the physiological and psychological conditions of a driver. Psychological conditions such as comfortableness or degree of alertness are estimated on the basis of physical data such as fluctuation in brain waves. This apparatus comprises a first neural network having a pre-processed 1/f fluctuation signal for brain waves as an input and for estimating a degree of alertness of the driver, and a second neural network receiving the estimated degree of alertness and the pre-processed 1/f fluctuation signal, for estimating and outputting driving comfortableness. By employing a neural network, which has a mapping ability as well as flexible adaptability even for non-linear data, based on the learning function, more accurate estimation of mental conditions can be achieved in comparison with conventional statistical analysis.
Abstract:
A novel synthetic mixed-layer silicate consisting of layers of serpentine and layers of saponite each having a specified chemical composition has excellent dispersibility in water to form colloidal dispersions capable of being converted into gels by standing so as to be useful as a gelating agent exhibiting thixotropy along with unique porosity characteristics which enable use as an adsorbent. The mixed-layer silicate is prepared by a process comprising the steps of: (a) preparing an acidic aqueous solution containing silicic acid, magnesium salt and aluminum salt; (b) alkalifying the solution by the addition of an alkaline compound to precipitate a hydrous composite oxide containing silicon, magnesium and aluminum; (c) collecting the precipitates of the hydrous composite oxide; (d) admixing the precipitates of the hydrous composite oxide with an aqueous solution of an alkali metal hydroxide to give an aqueous slurry; and (e) subjecting the aqueous slurry of the hydrous composite oxide to a hydrothermal treatment by heating at a temperature up to 500 °C.
Abstract:
A novel β-lactam compound is a 7-substituted-2-oxa-7-azabicyclo[3.2.0]heptan-6-one represented by the general formula
in which R is an alkyl, cycloalkyl, aryl, halogen-substituted aryl or alkaryl group, having usefulness as an intermediate for the synthesis of various biologically active compounds. The compound can be prepared by the reaction of an isocyanate compound RNCO, R being the same as above, and 2,3-dihydrofuran, preferably under pressurization up to 2000 atmospheres or higher.
Abstract:
A hydrophilic porous membrane having fine network structure and substantially comprising polypropylene is disclosed, which has on at least one side thereof a surface layer of about the same network structure as that of the inner portion, in which a hydrophilic polymer is chemically bonded to the membrane surface and fine pore surface, and which has an average pore size of 0.1 to 2.0 mu m, a bubble point of up to 2.0 kg/cm , voids of 60 to 85 %, and a water-penetrating amount of 2 ml/min.mmHg.m or more. This membrane is useful as a hydrophilic, plasma-separating membrane. A process for its production and a plasma-separating apparatus containing this membrane in a housing are also disclosed.
Abstract:
The present invention relates to a method and an apparatus of extracting the feature of voice and a method and apparatus of recognizing the voice by using the feature, in which a time-space pattern of scalar field obtained from the voice signal and regulated by the time axis and the space axis is converted into a vector field pattern by the space differentiation, whose orientation parameter is quantized to obtain a two dimensional pattern as the feature of voice by utilizing the quantization value. Thereby, a high recognition rate can be obtained when recognizing a large vocabulary and in case of a recognition by a non-specified speaker.