Abstract: An end point of polarization titration is detected by the steps of passing constant DC pulse having a magnitude of 0.1-100 .mu.A between a pair of detection electrodes immersed in a solution to be titrated, detecting a polarization state generated between the detection electrodes at each current passage before the polarization reaches an equilibrium state and judging the end point based on the detected polarization state. The polarization state is detected by integrating a polarization potential generated at each current passage and the polarization is eliminated by short circuiting the detection electrodes before passing the next DC pulse.

Abstract: A number of test tubes containing blood to be diagnosed are arranged in a matrix in a magazine. The test tubes of the foremost row are sent out one after one to a sample holding and transfer apparatus which transfers the sample to a stirring apparatus where the test tube is swung and alternately rotated in opposite directions by a pair of rollers. The stirred test tube is sent to blood diagnostic apparatus and then sent back to the rearmost row of the matrix. When all tubes in the foremost row are sent out, the remaining rows are moved to sequentially send out the test tubes in the second row.

Abstract: In apparatus for forming an inflation film of the type wherein a molten resin is ejected through a circular slit of a die, gas is blown into a resulting cylindrical film for inflating the film, and the cylindrical film is cooled by air ejected by an air ring, the air ring comprises an outer lip and an inner lip disposed closer to the die than the outer lip. The outer and inner lips form an air passage terminated with an air ejecting port, and the inner diameter of the outer lip increases in the direction of withdrawal of the cylindrical film. The air pressure in a space between the outer lip and the cylindrical film is reduced by Venturi tube effect or an evacuation device.

Abstract: In an array of coke ovens each including a plurality of combustion chambers having a plurality of flue nozzles, a measuring car equipped with a temperature measuring member runs above the array in a direction of the array or in a longitudinal direction of the combustion chambers so as to detect thermal radiations passing through the flue nozzles to measure combustion chamber temperature. The measured temperature is sent to a remote control room through antennae. Where a coal charging car of a Rahmen construction is used an antenna is also provided for the coal charging car so that even when the measuring car runs beneath the coal charging car, radio communication can be assured. The temperature of the combustion chambers can be readily and accurately measured by linearly running the measuring car whether combustion is effected in one or the other side of the combustion chambers.

Abstract: In a method and apparatus for fusing together thermoplastic synthetic resin molded articles wherein opposing ends of the molded articles are melted and then fused together under pressure, gaps are formed between holding mechanisms holding respective molded articles and moving mechanisms for moving the molded articles away from a heating plate so as to apply a percussive force upon the holding mechanisms by the movement of the moving mechanisms.

Abstract: A synthetic resin pallet is provided with at least one slip preventing member on the upper and or lower surfaces of the deck board. The slip preventing member is made of relatively soft and flexible material, preferably a polyolefin resin.

Abstract: A method and apparatus of preventing generation of smoke from a coke oven including a plurality of juxtaposed and alternately disposed combustion chambers and carbonization chambers so that the carbonization chambers are heated by heat generated in adjacent combustion chambers and exhaust gas is exhausted from the combustion chambers through a common smoke duct and a chimney, the exhaust gas is passed through a common exhaust gas duct including a dust collector for a predetermined interval after loading raw material coal into the carbonization chambers. At the end of this interval, the exhaust gas is again passed through the common smoke duct.

Abstract: In a foodstuff container of the type comprising a cylindrical body of a laminated sheet and lids closing the opposite ends of the cylindrical body, the laminated sheet is made up of two outer layers made of a thermoplastic resin consisting essentially of a synthetic resin having a melting point higher than 115.degree. C., a paper layer and an aluminum foil. The opposite side edges of the laminated sheet are covered by tape shaped aluminum foils with both surfaces coated with a thermoplastic resin similar to that of the laminated sheet, and one ends of both of the tape shaped aluminum foils are bent back to face the inner surface of the container. The tape shaped aluminum foils and the opposite side edges of the laminated sheet are welded together to form the cylindrical body.

Abstract: A sample decomposing apparatus of the type which includes a microwave heating containing chamber having on one side thereof a transparent door that intercepts microwaves and a perforation through a wall of the container, a microwave controller for controlling microwave radiated in the microwave heating container, and a gas collector having a gas discharge opening and at least one opening for removably mounting a plurality of sample decomposing containers. The gas collector is disposed in the microwave heating container, and the gas generated in the sample decomposing containers is collected by the gas collector and discharged to outside through the gas discharge opening.

Abstract: In a welding apparatus of the type including a pair of opposing press plates relatively movable toward and away each other and each supporting a molded article to be welded together, and a heating plate movable into and out of a space between separated molded articles for fusing confronting surfaces of the molded articles whereby the molded articles are welded together by applying pressure thereto by the press plates, there are provided mold frames on the press plates. The mold frames define an opening having substantially the same contour as the molded articles to be welded together but having a slightly smaller size than the molded article. The inner surface of the opening is provided with an outwardly inclined surface.

Abstract: In a titration controlling method and apparatus wherein variations of a titration system caused by intermittent titrations are successively detected electrically, and the quantity of each intermittent titration is controlled by an electric signal obtained by the detection until an end point is reached. According to the present invention, the quantity of each intermittent titration is determined by dividing the quantity of the immediately prior titration, which has been memorized, by the variation of the titration system caused by the immediately prior titration.

Abstract: In a horizontal type coke oven, high temperature waste gas generated in a heating flue chamber and containing nitrogen oxides is discharged into a regenerator. There are provided nozzle openings for injecting ammonia or ammonia precursor to the high temperature waste gas at a position where the temperature of the waste gas is about 750.degree.-1000.degree. C. so as to reduce the nitrogen oxides in the waste gas with the ammonia or ammonia precursor.

Abstract: In a titration controlling method and apparatus wherein variations of a titration system caused by intermittent titrations are successively detected electrically, and the quantity of each intermittent titration is controlled by an electric signal obtained by the detection until an end point is reached. According to the present invention, the quantity of each intermittent titration is determined by dividing the quantity of the immediately prior titration, which has been memorized, by the variation of the titration system caused by the immediately prior titration.

Abstract: In a coke oven of the type comprising an oven opening, an oven door for closing the oven opening, a knife-edge surrounding the oven door for forming a seal for preventing leakage of oven gas, there are provided a conduit arranged along the outside periphery of the oven opening and provided with a plurality of gas ejection nozzles, and means for supplying compressed gas to the conduit. The gas ejection nozzles are directed such that gas is blasted to the seal.

Abstract: In apparatus for measuring the hardness of rubber of the type wherein a needle is urged against the surface of a rubber sample and the degree of penetration of the needle is measured there are provided a coil spring, a lever for causing the needle to compress the spring and a releasable latch for holding the spring in the compressed state. When the spring is released it urges the needle against the rubber sample under a prescribed speed and force. The displacement of the needle is detected by an electric transducer and its output signal is processed by an electric circuit including a peak detector and an analogue-digital converter for digitally displaying the displacement. When the spring is released a switch is operated to start the analogue-digital converter for determining the starting point of the time necessary to measure the displacement by using the time as a parameter.

Abstract: In a method of tension stress testing of rubber of the type wherein a rubber sample is elongated continuously at a predetermined speed and the tension stress is measured when the distance between a pair of reference positions set on the surface of the sample shows a predetermined elongation, prior to the actual test, a plurality of rubber samples having different hardness are elongated continuously under predetermined tension test conditions, the tension stress measuring time between the time of commencing the continuous elongation and a time at which the distance between the reference positions is measured, and by utilizing the data thus obtained and the data regarding the hardness of respective rubber samples, the measuring time function of the tension stress measuring time regarding the hardness is determined by a statistical method.

Abstract: In anodic stripping voltametric apparatus the time constant of the filter circuit of the voltage holder is selected to be of from 0.01 to 0.1 second for the purpose of analyzing an extremely small quantity of metal ions at high accuracies.

Abstract: In welding apparatus of the type comprising a pair of opposed pressing boards, and a heated platen inserted into and retracted from a space between the pressing boards and the surfaces of the articles to be welded together are fused by the heated platen and then welded together by applying a pressure to the articles, there are provided holding mechanisms for holding the article at the opposing surfaces of the pressing boards and a spacer for defining predetermined gaps between the heated platen and the pressing boards.

Abstract: In stirring apparatus of the type provided with helical ribbon impeller, the ratio of the width of each impeller blade to the diameter of impeller is made to be from 1.5/10 to 3/10 and the blades are provided with openings having an opening ratio expressed by a relation0.59/.sup.3 .sqroot.D < opening ratio < 2.28/.sup.3 .sqroot.Dwhere D represents the diameter of the impeller.

Abstract: In a method of preparing maleic anhydride by oxidizing an unsaturated hydrocarbon or a mixture of unsaturated hydrocarbons having 4 or more carbon atoms in each molecule, there is used a catalyst comprising a mixed or complex oxide having the chemical composition:P.sub.a Mo.sub.b Bi.sub.c Cu.sub.d X.sub.e O.sub.fwhere X represents one or more members selected from the group consisting of iron, cobalt, nickel and potassium or the group consisting of iron, cobalt and nickel; a, b, c, d, e and f represent the number of atoms of P, Mo, Bi, Cu and O, respectively, e represents the sum of the number of atoms of the member or members represented by X; and the value of f is determined by the values of a, b, c, d and e and the valencies of P, Mo, Bi, Cu and O. Further addition of an alkali and/or alkaline earth metal as a component in the catalyst results in the improvement of the activity of the catalyst.