Abstract: A vessel equipped with a single screw comprising a propeller shaft positioned on the vertical hull center plane, an upper deck portion which is substantially symmetrical with respect to the vertical hull center plane, and a stern portion having a longitudinal plane passing through a stern end of the vessel. The longitudinal plane of the stern portion is positioned laterally offset from the vertical hull center plane by 5 to 25% of a diameter of a propeller disc plane. The longitudinal plane of the stern portion is positioned on the port side when the propeller shaft is rotated clockwise. The longitudinal plane of the stern portion is positioned on the starboard side when the propeller shaft is rotated counterclockwise.

Abstract: In a block type moving mold continuous casting machine of the type wherein a pair of block molds group each consisting of a plurality of block molds interconnected with each other in the form of an endless track are disposed in opposed relationship to define a mold cavity therebetween; and molten metal is supplied from one open end of the mold cavity and a solidified casting is continuously withdrawn out of the other open end of said mold cavity, a method and installation capable of removing a block mold which has been thermally deformed during the casting process from a carrier in a simple manner and quickly replacing with a new or repaired block mold.

Abstract: A method for melting and reducing chrome ore, which comprises charging chrome ore and carbonaceous material, and blowing in oxygen gas under a pressure ranging from 1 to 600 Torr, while molten metal is being stirred by a stirring gas blown in. In this method, a reaction vessel capable of allowing top blowing and bottom blowing onto the molten metal and decreasing pressure within the vessel is employed. Chrome ore and carbonaceous material can be used in the form of lumps or powder. When powdered ore and material are used, they can be injected through a lance or a tuyere into the vessel.

Abstract: This invention proposes an adsorbent containing mainly Cu(I) ion-exchanged and carried in a cation exchange site of a zeolite at an ion exchange ratio of not less than 50%, the zeolite having a silica/alumina ratio of not more than 10, and a salt of a least one metal selected from the group consisting of Cu(I), Fe, Zn, Ni, and Mg, the metal salt being dispersed and carried in pores of the zeolite. This invention also proposes a method of manufacturing the above adsorbent.

Abstract: A vessel equipped with a single screw, comprising a hull which is symmetrical with regard to a vertical center plane containing the center line of the hull, and a propeller shaft which is positioned laterally offset from the vertical center plane of the hull. The propeller shaft is positioned such that a ratio (d/D) is from 5 to 25%, where d represents a distance between the propeller shaft and the vertical center plane of the hull, and D represents the diameter of the propeller.

Abstract: A floating wave dissipation structure comprising tandem connected floating bodies separated by one or more rigid rods having a pivotally securing mechanism at the connection near the bottom of the body side wherein the structure is floated on the sea so that the tandem connected floating bodies are arranged along the direction of the waves. The length of the body in the direction of travel of the waves is selected so that the wavelength divided by the body length is between 2 and 10 with 2 to 7 providing transmission rates of 50% and below. Advantageously, the structure effectively dissipates waves of short, imtermediate and long wavelengths.

Abstract: A wave pool comprises a plurality of waterways, each having a wave-making device for generating waves at one end of the respective waterways and an opening at the other end, the bottoms of the waterways sloping upwards in the advancing direction of the waves which are generated by the wave-making devices. A pool is arranged adjacent to the openings of the waterways, the waterways opening into the pool. The plurality of waterways cross mutually on an extension of advancing direction lines of the generated waves. The pool is deeper in the center area thereof and shallower at the periphery thereof.

Abstract: The present invention relates to a highly corrosion-resistant surface-treated steel plate. The steel plate of the present invention comprises a zinc deposition or zinc alloy deposition film as the undercoat deposition layer, a chromate film formed on the undercoat deposition layer and a film of a resin composition formed on the chromate film. This resin composition comprises a base resin formed by adding at least one basic nitrogen atom and at least two primary hydroxyl groups to terminals of an epoxy resin. The resin composition may comprise a polyisocyanate compound as the curing agent. Furthermore, the resin composition may comprise silica or a hardly soluble chromium compound as the additive for improving the corrosion resistance. Moreover, the resin composition may comprise a silane compound as the crosslinking agent for the base resin and silica.

Abstract: Fe alloy containing Si: 4.0 to 7.0 wt %, Mn: not more than 0.5 wt %, P: not more than 0.1 wt %, S: not more than 0.02 wt %, Al: not more than 2 wt % is molten, and made an ingot or continuously cast into a piece. The piece is subjected to slabbing-roughing, otherwise roughing at temperature of more than 1000.degree. C. and at total reduction of more than 50%, and further a hot finish rolling. The hot finish rolling is performed at temperature of not more than 1100.degree. C. and under a total reduction which is specified by a relation between average grain diameter before the hot finish rolling and Si content, and coiled at temperature of not more than 750.degree. C. after the rolling. The hot rolled plate is performed with cold rolling or warm rolling after the descaling and hot rolled strip annealing. If required, an intermediate annealing is performed in the course of the cold (or warm) rolling.

Abstract: A method for recovering hydrocarbon vapor wherein permeable mixed gases of high concentration hydrocarbon vapor and the residual mixed gases of low concentration hydrocarbon vapor are separated, through gas separation membrane, from initial mixed gases containing hydrocarbon vapor to absorb permeable mixed gases, and a method for recovering hydrocarbon vapor wherein initial mixed gases containing hydrocarbon vapor are brought into contact with liquid absorbent to recover hydrocarbon vapor, and gases of high concentration hydrocarbon vapor and gases of low concentration hydrocarbon vapor are separated, through gas separation membrane, from treated gases from which hydrocarbon vapor has been absorbed in the preceeding process.

Abstract: A horizontal type continuous casting machine for casting molten steel into a cast steel strand, which comprises: a tundish for receiving molten steel to be cast; a horizontal metal mold connected through a front nozzle, a feed nozzle, a break ring and a metal spacer ring having therein a cooling water passage to an opening provided in the lower portion of a side wall of the tundish; at least one pair of pinch rolls for intermittently and continuously withdrawing molten steel directed from the tundish to the horizontal mold into a cast steel strand in the horizontal direction through the horizontal mold by means of a plurality of cycles each comprising one pull and one push; and a cooling zone for cooling the cast steel strand withdrawn from the horizontal mold.

Abstract: A wear resistance rail which comprises 0.50 to 0.85 wt. % of C, 0.10 to 1.0 wt. % of Si, 0.50 to 1.50 wt. % of Mn, less than 0.035 wt. % of P, less than 0.035 wt. % of S, less than 0.050 wt. % of Al, and the balance of iron and impurities. The web has a high toughness tempered bainite structure, tempered martensite structure or a tempered mixed structure of bainite and martensite and the head rail has high wear resistance which prevents unstable destructive cracks from propagating. The rail can further contain one or more of 0.05 to 1.50 wt. % of Cr, 0.05 to 0.20 wt. % of Mo, 0.03 to 0.10 wt. % of V, 0.10 to 1.00 wt. % of Ni, and 0.005 to 0.050 wt. % of Nb.

Abstract: A method for manufacturing alloy comprising: allowing a consumable electrode consisting a single metal element to form a pair of electrodes which have the same element, to set plurality of the pair so that an electrode metal element of each of the plurality of the pair may be different from one another; generating arc between the electrodes in a non-oxidizing atmosphere, to allow the consumable electrodes to be melted at their top ends; and allowing molten drops produced by the melting to go down into a mold to form molten metal, and the molten metal to be cast into alloy consisting of two metal elements. Two pairs consisting of the consumable electrodes allow the two consumable electrodes to be set on an axis, with a predetermined distance between their top ends, on horizontal plane above the mold.The two pairs of the consumable electrodes are alternated by three pairs of the consumable electrodes when alloy consisting of three metal elements.

Abstract: A technique for dehydrating a wet sludge. Wet sludge is subjected to a preliminary dehydration by gravity dehydration or the like. It is then pelletized by a pelletizer, and obtained pellets of the sludge are subjected to compression dehydration with a pair of endless filter fabrics.

Abstract: This invention relates to a continuously treating line for a steel band, having a heating furnace by directly flaming. For heating the steel band with causing reduction, the heating furnace of directly flaming system is provided with a plurality of heating burners of reduction system which may form non-equilibrium range of the air and the fuel in a flame, that is, a reduction range, wherein the heating burners are positioned at predetermined arrangement with respect to the steel band and at a certain pitch predetermined in relation with an inner diameter of the burner in a line running direction.The treating line has said heating furnace constructed as mentioned above and a subsequent atmosphere furnace, and said atmosphere furnace may be provided with a sealing chamber having various means for avoiding invasion of the outer air.

Abstract: A method for molding powders which comprises introducing a thin-wall resilient mold inside a ventilative mold support, reducing the outside pressure of the ventilative mold support to less than the atmospheric pressure (760 Torr), putting a thin-wall resilient mold exactly close to the inside wall of the ventilative mold support, supplying powder material into the thin-wall resilient mold, exhausting air existing in the voids formed in the powder material, and taking the ventilative mold support apart to apply cold isostatic press treatment to the thin-wall resilient mold. The shape of the thin-wall resilient mold is similar to the shape of the ventilative mold support.

Abstract: An automatic fillet welding method for effecting the welding by rotating a welding electrode and thereby rotating an arc at a high speed. By rotating the arc with a predetermined rotation direction, rotation speed and rotation diameter, a weld metal is prevented from running downward thereby forming a bead having uniform leg lengths and an excellent depth of penetration.

Abstract: An apparatus for hot dip plating on one side of a metal strip, comprising a plurality of nozzles disposed at an oblique angle to the direction of travel of the strip and having outlets which are tilted toward the edges of the strip, whereby splashing of the plating material is avoided, and occurence of plating material on the non-plated side of the strip is also avoided, and the plating is regular and without irregularity of plating or areas lacking plating material.

Abstract: In moving-mold type or dual-belt type continuous casting machines, the molten metal static pressure in the mold cavity is detected and the quantity of the molten metal poured through the tundish nozzle into the mold cavity is controlled such that the static pressure in the mold cavity is maintained at a predetermined range in which penetration of the molten metal into the gap between the tundish nozzle and the mold assembly can be avoided.

Abstract: A method of manufacturing pressure vessel steel having high strength and high toughness comprising the steps of heating steel to a temperature higher than 1200.degree. C., said steel containing from 0.03 to 0.12 wt. % C, 0.10 to 0.8 wt. % Si, 0.45 to 1.00 wt. % Mn, 0.80 to 3.50 wt. % Cr, 0.10 to 1.60 wt. % Mo, 0.10 to 0.53 wt. % Ni, 0.010 to 0.040 wt. % soluble aluminum, at least one of 0.05 to 0.40 wt. % V and 0.02 to 0.20 wt. % Nb, less than 0.010 wt. % Ti, 0.0002 to 0.0010 wt. % B, and less than 0.004 wt. % N, the balance of iron and impurities, the N and Ti satisfying the following equationN<14/48.times.Ti+0.0024%;rolling the heated steel at a temperature above 1050.degree. C. to obtain a total reduction of more than 30%; directly quenching the rolled steel; and tempering the rolled steel.