Abstract: The invention relates to a device and system for underground transport of ore, material and people, which includes electrical and mechanical drive systems, a plurality of hoisting devices, head ropes and balance ropes. The mass per meter of the balance ropes is significantly smaller than the mass per meter of the head ropes.

Abstract: A hot worked matrix steel consisting of (in weight-%) 0.60-0.85 C, 0.05-0.5 Si, ?0.5 (Si+Al), 0.1-2.0 Mn, 4.5-5.5 Cr, 1.5-2.6 Mo, ?1.0 W, 1.5-2.6 (Mo+W/2), 0.42-0.65 V, ?0.1 Nb, ?0.1 Ti, ?0.1 Zr, ?2.0 Co, ?2.0 Ni, ?0.003 S, optionally, up to 30 ppm B, balance iron and unavoidable impurities. The steel after hardening and tempering at 520-600° C. (2×2 h) has a hardness of 57-63 HRC and an un-notched impact energy in the transverse direction of 20-100 J. The steel consists of tempered martensite. The steel contains 1.04 vol. % or less of primary precipitated vanadium carbides. The steel is void of primary carbides other than primary precipitated vanadium carbides.

Abstract: The invention concerns a cold work steel having the following chemical composition in weight-%: 0.60-0.85 C from traces to 1.5 (Si+Al) 0.1-2.0 Mn 3.0-7.0 Cr 1.5-4.0 (Mo+), however max. 1.0 W 0.30-0.65 V max. 0.1 of each of Nb, Ti, and Zr max. 2.0 Co max. 2.0 Ni balance essentially only iron and unavoidable impurities.

Abstract: A method is provided for producing a doped dilute ferromagnetic semiconductor material, by doping Zinc Oxide in bulk form with manganese to a maximum level of 5 atomic percent concentration. The material is preferably sintered at a maximum temperature of 650° C. The result of this process is a semiconductor material comprising Mn-doped ZnO with a Mn concentration not exceeding 5 atomic percent, wherein the Mn-doped ZnO is ferromagnetic within at least a part of the temperature range from about 218 Kelvin to about 425 Kelvin.

Abstract: The invention relates to a device and system for underground transport of ore, material and people, which includes electrical and mechanical drive systems, a plurality of hoisting devices, head ropes and balance ropes. The mass per meter of the balance ropes is significantly smaller than the mass per meter of the head ropes.

Abstract: A method is provided for producing a doped dilute ferromagnetic semiconductor material, by doping Zinc Oxide in bulk form with manganese to a maximum level of 5 atomic percent concentration. The material is preferably sintered at a maximum temperature of 650° C. The result of this process is a semiconductor material comprising Mn-doped ZnO with a Mn concentration not exceeding 5 atomic percent, wherein the Mn-doped ZnO is ferromagnetic within at least a part of the temperature range from about 218 Kelvin to about 425 Kelvin.

Abstract: The invention concerns a cold work steel having the following chemical composition in weight-%: 0.60-0.85 C from traces to 1.5 (Si+Al) 0.1-2.0 Mn 3.0-7.0 Cr 1.5-4.0 (Mo+), however max. 1.0 W 0.30-0.65 V max. 0.1 of each of Nb, Ti, and Zr max. 2.0 Co max. 2.0 Ni balance essentially only iron and unavoidable impurities.

Abstract: A method and apparatus for treatment of the fly ash are described wherein heavy metals are separated and wherein there is formed a leaching resistant slag; the fly ash is introduced into a reactor into an oxidizing gas stream which is heated to at least 2500 degrees C. in a plasma generator; the fly ash melts and forms liquid drops of slag and a carbonaceous or hydrocarbonaceous material is added to the gas stream which burns and supplies extra energy to the process; the ratio of oxygen and carbon is regulated so that the ratio CO.sub.2 /CO+CO.sub.2 is kept within the limits 0.4-0.

Abstract: The invention relates to a cold work steel having a very high resistance to wear and good impact strength made powder-metallurgically through the consolidation of metal powder to a dense body. The powder has the following chemical composition expressed in weight-%: 0.5-2.5 C, 0.1-2 Si, 0.1-2 Mn, 0.5-1.5 N, max 15 Cr, preferably 6.5-111 Cr, max 4 Mo, max 1 W, 3-15 V, wherein up to half the amount of vanadium can be replaced by 1.5 times as much niobium, and part of the vanadium can be replaced by titanium at a content up to four times the content of nitrogen and the double amount of zirconium at a content up to eight times the content of nitrogen, and wherein the ratio V/(C+N) shall amount to not less than 2.5 and not more than 3.8, balance essentially only iron, impurities and accessory elements in normal quantities. The invention also relates to a method of manufacturing the steel. First there is made a steel powder having a composition as above with the exception of the nitrogen content.

Abstract: The invention relates to a tool steel intended for cold working operations and having very high impact strength and good resistance to wear, said steel being made powder-metallurgically by consolidation of metal powder to a dense body. The steel has the following chemical composition expessed in weight-% 1-2.5% C, 0.1-2% Si, max 0.3% N, 0.1-2% Mn, 6.5-11% Cr, max 4% Mo, max 1% W and 3-7% V, wherein up to half the amount of vanadium can be replaced by 1.5 times as much niobium, and wherein the ratio V/C shall amount to between 2.5 and 3.7, balance essentially only iron and impurities and accessory elements in normal amounts.

Abstract: The present invention relates to a method and means for condensing zinc vapor out of a gas. A substantially coherent curtain (25) of cooling metal is generated, towards which the gas containing zinc vapor is directed. The resultant mixture is expanded in an expansion zone (21a) and thereafter accelerated in a compression zone (21b), thus ensuring that all parts of the gas are brought into contact with the cooling metal. Particles and drops are then separated by passing the gas over the surface of a bath of cooling metal (28).

Abstract: Pressure damper for recoilless weapon designed to reduce the pressure in the area around and immediately to the rear of the muzzle of the barrel. A container with liquid is placed in the barrel close to its muzzle or in a forward extended portion of the barrel and arranged to be burst when the weapon is fired so that the liquid is suddenly released and mixed with the gases from the powder.

Abstract: Recovery of zinc from a gas containing zinc vapor is carried out by means of lead circulating in a circuit and separating out pure metallic zinc by cooling said lead. The gas containing zinc vapor is brought into intimate contact with atomized lead in liquid form which takes up the zinc. The lead is introduced at the top of a cooling tower (1) and the gas is conducted in counter-flow to the atomized lead droplets. Lead collected at the bottom of the tower (1) is transported (7) to a separating chamber (8) where it is cooled, so that the zinc is segregated from the lead and can be separated (10). The lead is then cooled further before being recirculated (15, 16) to the top of the cooling tower.

Abstract: A mortar carriage includes a holder (10) for a tube (19) and two angularly related legs (11, 12). The legs have adjustment devices (112, 122) for adjustment of the length.A sensor (13) senses the incline of site and the elevation of the tube (19) and controls the electric motors (111, 121) which drive the adjustment devices (112, 122).Control devices with a counting unit (20) controls the automatic adjustment of the length of the legs (11, 12) by coarse adjustment of incline of site and elevation respectively and after that fine adjustment of incline of site and elevation respectively. At the adjustments for incline of site the actuation of the legs (11, 12) happens in opposite directions and at the adjustment for elevation the actuation happens in the same directions.

Abstract: In a process for manufacturing a gas substantially containing carbon monoxide and hydrogen gas from a starting material containing carbon and/or hydrocarbon, the starting material is injected in powder or liquid form together with an oxidizing agent and slag former in a combustion zone while heat energy is simultaneously supplied. The combustion zone is formed in the lower portion of a shaft filled with particulate, solid, carbonaceous material and sulphur-binding slag former.

Abstract: In a method of utilizing a plasma generator to increase the blast temperature in a shaft furnace for melting and possible reduction of metals and/or metal oxides, the thermal energy produced in the plasma generator is transferred, in order essentially to prevent the formation of nitrogen oxide, from the plasma generator to the blast gas via a gas which is inert or oxidizing in relation to the metal to be processed, the product of the oxygen mol fraction and the nitrogen mol fraction in the gas used being less than or equal to 0.02.

Abstract: Disclosed are a method and apparatus for manufacturing sponge iron by the continuous reduction of iron oxides in a shaft utilizing recirculation gases. Reaction gas is removed from the shaft furnace, substantially cleaned of all CO.sub.2 and H.sub.2 O, and then divided into at least two flow portions one of which is passed to a gas generator comprising a gas generating shaft substantially filled with a solid reducing agent and a plasma burner arranged in the lower portion of said shaft. An oxidant is injected into the hot gas from the plasma burner so as to form a gas mixture comprised primarily of CO and H.sub.2, which gas mixture is then mixed with the other flow portion of the cleaned reaction gas in such proportion that the temperature of the resulting reduction gas is suitable for the reduction of iron oxides in the shaft furnace.

Abstract: In an assembly of spaced heat exchange plates, each second interspace is sealed from the surrounding atmosphere by gasket means extending along the periphery of the adjacent plates forming such interspace, the other interspaces being sealed from the surrounding atmosphere by permanent joints between the adjacent plates forming said other interspaces. The plates have pressed corrugations in their heat exchanging surfaces and also have pressed grooves extending around said surfaces for receiving the gasket means. The permanent joints are formed along abutting bottoms of the pressed grooves of the respective adjacent plates. The seals formed by said joints and the seals formed by the gasket means are disposed in aligned relation across the plate heat exchanger.