Abstract: A formwork system for a concrete floor provided with a floor joist, comprising side form elements for the lateral surfaces of the floor joist, the sheathing of the side form elements being fastened to frame pieces extending perpendicularly to the longitudinal axis of the floor joist, further bottom form elements having at least one sheathing for the underside of the floor joist, and devices for interconnecting the side form elements, characterized in that at least the side form elements (1, 2, 61, 130, 131) of one side are pivotally suspended from the ceiling formwork (girder 65) and that the side form elements are interconnected by fastening means (7, 9, 148) that can be released for stripping.

Abstract: Method for the direct joining of metal pieces which have a surface metal oxide layer, to oxide ceramic substrates by heating the ceramic substrates covered with the metal pieces in an oxygen-containing atmosphere to a temperature above the eutectic temperature of the metal and the metal oxide, but below the melting temperature of the metal. The heating is carried out in a continuous heating furnace in a nitrogen atmosphere with an addition of oxygen of 20 to 50 vpm. The cooling-down in the continuous heating furnace takes place after the solidification of the eutectic melt, in a nitrogen atmosphere which has an oxygen content well below the 20 vpm.

Abstract: An improved electrically conductive current collector suitable for use in high temperature applications in the presence of corrosive environments comprising: (A) a high strength, noncorrosive electronically conductive ceramic member which serves as the primary load bearing element for said current collector; and (b) a highly electronically conductive metal cladding intimately attached to a substantial portion of ore surface of said ceramic member and adapted to direct current flow through said ceramic member and to shunt said current between said member and an external contact. The disclosed current collectors are ideally suited for use as current collectors and current collector/containers for electrical conversion devices such as the sodium/sulfur battery and the like. Also disclosed are two processes for preparing tantalum or niobium doped rutile titanium dioxide.

Abstract: In a multiple-span bridge structure with side-by-side bridges, a scaffolding girder-formwork assembly is movable in the longitudinal direction of each bridge for constructing individual sections of the superstructure over support piers. After use on one bridge, the scaffolding girder-formwork assembly is movable to the other bridge by first rotating it about a vertical axis from the longitudinal direction of the bridge to the transverse direction while the assembly is centered over a pier of the one bridge. A support for the assembly is moved over a pier on the other bridge. Then the assembly is moved in the transverse direction until it is centered over the pier of the other bridge. Subsequently, the assembly is rotated into the longitudinal direction of the other bridge in position for constructing sections of the superstructure.

Abstract: A method of making a heat fused silicon nitride comprising object is disclosed. A series of measured powder shots are containerized to be carried in the container between the nitriding and heat fusing steps. The containerization comprises lining the internal wall of a graphitic sleeve, treated for inertness, with a refractory metal foil essentially impervious to migration of carbon ions and having a thickness of 0.2 inches or less. A series of measured shots, of a powder mixture of silicon and oxygen carrying agents, is inserted into the assembly, each shot being separated by an inert spacer. The assembly is subjected to a nitriding treatment and subsequently hot pressed/or sintered.

Abstract: A method of manufacturing a dielectric from ferroelectric ceramic material having a perovskite structure with the basic formula ABO.sub.3. In the method, the dielectric is sintered in a reducing atmosphere and the sintered body is aftertreated at a temperature in the range of from 500.degree. to 900.degree. C. in an N.sub.2 --O.sub.2 atmosphere. The atmosphere contains a quantity of O.sub.2 corresponding to a partial O.sub.2 -pressure between 10.sup.-5 bar and 0.2 bar.

Abstract: Off-size greenware (the product resulting from the initial gelation and filter pressing of calcareous and siliceous materials in an aqueous slurry) is recycled. The greenware is pulverized into a desirable size and combined with new calcareous and siliceous materials in the initial slurrying step. The slurry containing recycled greenware gels at an improved rate.

Abstract: A method for preparing high density yttria-gadolinia ceramic scintillators includes cold-pressing a multicomponent powder to form powder compacts and then sintering the compacts to form transparent-to-translucent ceramic scintillator bodies. The powder compacts are formed by either die pressing or die pressing followed by isostatic pressing to further increase green density. The powder compacts are sintered in vacuum or a reducing atmosphere at a temperature of between 1800.degree. C. and 2100.degree. C. The preferred heating sequence includes a holding period at a temperature lower than the final sintering temperature. The finished scintillator includes Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3, and one or more of Eu.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Pr.sub.2 O.sub.3, Dy.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare earth activator oxides. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.

Abstract: A method for building a reinforced concrete structure in which column frameworks and beam frameworks each having a novel structure are assembled at a building site, and thereafter concrete is placed within column sheathing boards and beam sheathing boards around the novel column frameworks and beam frameworks, respectively.

Abstract: A ceramic substrate for use as a semiconductor package which includes a plate member having an engraved cavity portion on a first face portion thereof and having a rounded corner on a peripheral surface opposite the first face portion and having a first and second stepped crest formed along the edge formed at the boundary of a second face portion opposite said first face portion for increasing impact resistance to chipping and cracking of the ceramic substrate. A method of manufacturing the ceramic substrate includes adding the ceramic powder to a first mold member, pressing a force applying member into the first mold member, forming on the ceramic substrate a first and second stepped crest, sintering the ceramic substrate and grinding at least one of the first and second stepped crests so as to round the at least one of the stepped crests.

Abstract: Steel, cast iron, synthetic resin or concrete pipes are coated with a hydraulically setting mass, such as cement mortar or a mixture of cement, fibers, aggregates and optional additives, by entraining the mass before it has set from a storage container having two opposite walls moving at about the same speed, one of the container walls being formed by a portion of the circumferential wall of the pipe being rotated about its longitudinal axis and the opposite container wall being formed by a tensioned carrier band having one end affixed to the rotating pipe and the mass with the covering tensioned carrier band being wound around the rotating pipe.

Abstract: A precision molded electrical discharge machining electrode is made by shaping a preform from granules of carbon and granules of a refractory material selected from the group consisting of tungsten, molybdenum, carbides thereof, and stoichiometric and hyperstoichiometric carbides of the other elements of the groups IVB, VB, and VIB of the Periodic Table of the Elements, the carbon and refractory granules being interconnected in the form of a skeleton at their contiguous points of contact, and infiltrating the preform with copper, silver, or alloys containing those metals.

Abstract: An unsupported form system for ceiling formworks is disclosed which comprises of three elements, i.e. extensible shores, head elements on the top of said shores and form boards to be positioned directly on the head elements. The head elements have flat supports for the boards which, for their part, have an open frame, the edges thereof cooperating with truncated pyramid noses on said supports. The boards may be suspended on the head elements of erected shores from below and may be brought into their horizontal operational position with the next shores once these have been erected. Pivotal levers are used for supporting adjacent boards between those which are supported directly on the head elements which interconnect said shores in pairs.

Abstract: Polycrystalline ceramic scintillators are prepared by a vacuum hot-pressing method. The process includes pressing a multi-component powder at high temperature under vacuum. Following a holding period, the pressure and temperature are increased and maintained for a predetermined length of time. The finished scintillator includes Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3, and one or more of Eu.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, DY.sub.2 O.sub.3, Pr.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare earth activator oxides. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.

Abstract: Polycrystalline ceramic scintillators are prepared by a vacuum hot-pressing method. The process includes pressing a multicomponent powder at high temperature under vacuum. Following a holding period, the pressure and temperature are increased and maintained for a predetermined length of time. The finished scintillator includes Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3, and one or more of Eu.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Pr.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare earth activator oxides. At least one of the oxides of elements Zr, Th, and Ta is included as a transparency promoting densifying agent. At least one of CaO and SrO may be included as a light output restorer.

Abstract: A method of cyclic injection molding a thermoplastic material, utilizing a combination of a sandwich mold and an injection unit which together encompass a bifurcated feed system with a molten core. The feed system includes a channel system encompassed by the injection unit and a runner system encompassed by the sandwich mold. The feed system defines a first branch for feeding a first cooling cavity encompassed by a first parting surface, and a second branch for feeding a second cooling cavity encompassed by a second parting surface. Each cooling cavity passes through a retracted period and a protracted period which together make up its production cycle. The retracted period includes an injection period and a cooling period. The protracted period includes an opening period and a closing period. The method is characterized by the step of desynchronizing the injection period of the first cooling cavity with the injection period of the second cooling cavity.

Abstract: The disclosed ceramic rotor comprises integrally formed blade portions made of ceramics sintered at atmospheric pressure and a blade-holding portion to which said blade portions are integrally cemented by ceramic material. The blade-holding portion is made of ceramics sintered at atmospheric pressure and has a larger density than that of the blade portions. The thickness of the blade-holding portion is not smaller than the thickness of the blade portions but smaller than the distance between the front and rear surfaces of the blade portions. In the disclosed process, bodies of the blade portions and the blade-holding portion are separately formed and coupled by applying ceramic material therebetween, and the coupled bodies are sintered at atmospheric pressure to produce the ceramic rotor.

Abstract: A method for heating a riser of a molten refractory material in which after a heat molten refractory material is poured into a mold, a melt of the molten refractory material at an upper portion of the mold is directly subjected to induction heating by conducting an electric current by application of an AC voltage at a frequency of from 50 to 1,000 KHz to an induction coil with at least 2 windings around the riser portion containing said melt without induction heating the upper portion of the mold.

Abstract: A ferrite magnet and a method of producing same, wherein a mixture of magnetoplumbite type ferrite particles contained as its principal constituent and at least one of a mixing medium, an organic binder and a minute particular additive which is added with water or methyl alcohol is subjected to extrusion compacting to form compacts. The formed compacts are each subjected to at least drying, sintering, orienting and magnetizing, to produce cylindrical ferrite magnets having a plurality of magnetic poles on the surface. To impart anisotropy to the magnets, at least one pulse magnetic field may be applied on the surface of each compact formed by extrusion compacting, and the oriented compact may be magnetized in the same direction as the direction in which the anisotropy has been imparted.

Abstract: Method and apparatus for forming particles into shaped preforms by confining the loose particles in a shaped closure having at least one moveable side, subjecting each particle of the mass and at least a portion of the mold to an acceleration of a magnitude of at least 25 to 50 G's, and preferably in the range of 500 G's to 5000 G's, or greater, to generate at each particles a force causing such particle to impact with adjacent particles and form a homogeneous, fused article, and articles so formed.