Abstract: A subaqueous underground survey system using a reflection seismic survey method includes: multiple sound sources 1 for generating sound waves in the water; a controller 2 for controlling phases of the sound waves; a geophone 3 for receiving reflected waves of the sound waves; and an observation ship 4 equipped with the sound sources 1, wherein the controller 2 controls phases of the sound sources 1 so that the sound waves generated from the respective sound sources 1 have a phase difference at a water bottom surface B, thereby controlling generation of shear waves to propagate into the ground.

Abstract: A subaqueous underground survey system using a reflection seismic survey method includes: multiple sound sources 1 for generating sound waves in the water; a controller 2 for controlling phases of the sound waves; a geophone 3 for receiving reflected waves of the sound waves; and an observation ship 4 equipped with the sound sources 1, wherein the controller 2 controls phases of the sound sources 1 so that the sound waves generated from the respective sound sources 1 have a phase difference at a water bottom surface B, thereby controlling generation of shear waves to propagate into the ground.

Abstract: A pressure pulse wave sensor for being worn on a surface of a body of a living subject so as to detect a pressure pulse wave from the subject, the sensor including a plurality of elongate flexible piezoelectric sheets each of which is formed of a piezoelectric resin and detects a pressure pulse wave from the subject, and a flexible sheet to which the piezoelectric sheets are fixed such that the piezoelectric sheets are arranged in a widthwise direction thereof.

Abstract: A pressure pulse wave sensor for being worn on a surface of a body of a living subject so as to detect a pressure pulse wave from the subject, the sensor including a plurality of elongate flexible piezoelectric sheets each of which is formed of a piezoelectric resin and detects a pressure pulse wave from the subject, and a flexible sheet to which the piezoelectric sheets are fixed such that the piezoelectric sheets are arranged in a widthwise direction thereof.

Abstract: Luminous fluxes from a xenon tube are introduced from one end of an optical fiber to an other end thereof and emerge therefrom. These luminous fluxes are incident of a skin of a person to be measured, and those diffused in the skin are incident on one end of an optical fiber through a first incident port and on one end of an optical fiber through a second incident port. The luminous fluxes from the one end are split by a dichroic mirror. The luminous fluxes reflected by the dichroic mirror are received by a photoelectric conversion element via a blue filter, and those having transmitted through the dichroic mirror are received by a photoelectric conversion element via a green filter. A concentration of bilirubin pigmented in fat of subcutaneous tissues can be accurately measured without being influenced by a difference in the thicknesses of epidermis and derma.

Abstract: An attachment is designed such that a concentration measuring apparatus is attachable to and detachable from it. Inside the leading end portion of the attachment, leading ends of two light guide members are provided opposite to each other so as to hold a micro cuvette mounted on the attachment. One light guide member guides light from a light source of the concentration measuring apparatus to subject matter in the micro cuvette while the other guides light from the subject matter to light receiving elements of the concentration measuring apparatus. The concentration measuring apparatus calculates a concentration of the subject matter based on respective outputs from the light receiving elements.

Abstract: The object of this invention is to provide an extremely simple device to extract information to distinguish between obstructive apnea and central apnea and which performs this operation automatically based on the extracted information.The device is equipped with analog signal processor 2 for generating pulse wave signals based on light received from a light emitting means and passing through or reflecting off living tissue; pulse wave base line analog signal processor 9 for extracting change components of a base line of the generated pulse wave signal; and master microcomputer 6 for distinguishing between obstructive apnea and central apnea on the basis of the extracted pulse wave base line change components.

Abstract: An optical density detector which comprises a first light source for emitting a first light which belongs to a wavelength region in which the first light is hardly absorbed by a specific material contained in a sample, a second light source for emitting a second light which belongs to a wavelength region in which the second light is absorbed, substantially as compared with the first light, by the specific material, wherein a peak-wavelength of the second light is shifted by change of a temperature and change of an absorption of the specific material caused by the peak-wavelength shift is characteristic of a linear equation with a gentle grade, light receiving device for measuring a quantity of the first and the second lights which are transmitted through the sample, an arithmetic unit for calculating difference of absorbance between the first light and the second light of which both change depending on the density of the specific material, a temperature measuring device for measuring the temperature of the fi

Abstract: A method of producing a pattern for use in the manufacture of a mold which is adapted to be cured by microwave irradiation. The method comprises forming a rolled-over male pattern, forming a rolled-over female pattern having a scale-off layer along a boundary thereof with the male pattern, removing the scale-off layer, pouring a silicone RTV rubber into a cavity of the female pattern to form a match plate therein, setting a metallic frame on the match plate, filling the interior of the metallic frame with a mixture of microwave-pervious resin and dry silica sand, causing the mixture to be thermally cured thereby forming a reinforcing layer on the peripheral surface of the match plate, placing the male pattern within the reinforcing layer after removing the match plate therefrom, and injecting a microwave-pervious silicone rubber into the gap formed between the reinforcing layer and the male pattern thereby forming a mold defining layer on the inner surface of the reinforcing layer.

Abstract: A method for making a mold employing a flexible pattern and a microwave radiation. A flexible pattern is formed with a material which allows microwave to pass therethrough and which pattern is then coated with a liquid facing agent, including a dielectric material to the microwave, a thermosetting resin, and refractory material powders, by either dipping or spraying. The coated pattern is covered by a molding material, including a thermosetting resin and a dielectric material to the microwave, and then the molding material covered pattern is exposed to a microwave radiation for a time sufficient to harden the molding material, and finally the pattern is separated from the hardened molding material leaving a facing agent covered mold behind.

Abstract: A molding sand for use in a molding process employing a microwave radiation for curing the molding sand. The molding sand comprises a new sand, a carbonized resin coated sand and a thermosetting or thermoplastic resin. The carbonized resin coated sand is preferably subjected to a scrubbing treatment prior to the admixture thereof with the new sand.

Abstract: An electro-optical medical instrument is provided for measuring the presence of bilirubin in skin tissue. The instrument is preferably hand-held and self-contained and utilizes a source of flash light to provide sufficient energy in the desired wavelength spectrums. The medical instrument can be automatically activated at a predetermined pressure against a patient's skin to provide a pair of measurement electrical signals. These electrical signals can be processed to provide an output signal representative of the bilirubin value which can be conveniently displayed.

Abstract: An apparatus for measuring an optical property of an object such as its optical density, is disclosed. The apparatus comprises a light flash source, a photodiode coupled to a current-voltage transducer, a reference voltage source, a voltage comparator for comparing the reference voltage and voltage of the transducer, and a clock pulse generator and pulse counter triggered by the light flash source. The comparator compares the voltage from the transducer and the reference source, and disables the counter when the transducer voltage level drops below the reference voltage level. The apparatus relies upon the fact that the intensity of light emitted by the light source decays as a function of time, including a region where the intensity decays in an exponential function of time. By appropriate selection of the apparatus component parameters, the apparatus will produce a data response equal to the optical density without the need for additional logarithmic conversion circuitry.

Abstract: An automatically light adjusted luminous indicator observable through a camera view finder includes a photoconductor exposed to the camera incident light and either constitutes or controls the resistance component of a frequency controlling RC network of a relaxation oscillator. The output of the relaxation oscillator controls a bi-stable multivibrator whose output is coupled through a switching transistor to the primary of a transformer whose secondary is connected to a light emitting member such as an electroluminescent device or a light emitting diode. The parameters of the network are adjusted so that the luminosity of the indicator and viewed image are about equal or within any desired ratio range. The photoconductor may also control an exposure control network.

Abstract: An optical non-invasive oximeter for measuring oxygen saturation in arterial blood utilizes a light source capable of giving off light having different wavelengths, such as light in the infrared and red region, and a pair of photoelectric devices, one responding to one wavelength and the other to the other wavelength, for detecting the amount of such light transmitted through living tissue. Each photoelectric device is connected to a computing circuit which generates a signal that represents the logarithm of the quotient of the signal received from the photoelectric device divided by its direct current component. The signals from each of the computing circuits are differentiated and then divided, one by the other, to provide an indication of oxygen saturation in the blood.

Abstract: A powdered facing agent for use in forming a shell mold, which is composed of a powdered refractory, such as silica, alumina, zircon, silex, magnesia, etc., a novolak type phenol resin, a resol type phenol resin and/or vinyl acetate resin.