An early high-strength mineral polymer composition is formed of a polysialatesiloxo material obtained by adding a reactant mixture consisting of alumino-silicate oxide (Si2O5,Al2O2) with the aluminum cation in a four-fold coordination, strong alkalis such as sodium hydroxide and/or potassium hydroxide, water, and a sodium/potassium polysilicate solution; and from 15 to 26 parts, by weight, based u...

A device for collecting manganese nodules or the like from the ocean floor having a frame that is drawn across the ocean floor, a cylinder rotating around a horizontal axis which has on its circumference brushes for picking up manganese nodules in the circumferential direction. A screen surrounds the rear half of the cylinder. Hook-like rods mounted on the screen terminate in prongs pointing in th...

An improved water loss control additive for hydraulic cements, particularly hydraulic cements used in subterranean well bore cementing operations, is disclosed. The additive comprises an aqueous solution comprising a tetrapolymer of N-vinyl-2-pyrrolidone, acrylamide and/or methacrylamide, sodium 2-acrylamido-2-methylpropane sulfonate and/or 2-acrylamido-2-methylpropane sulfonic acid, and acrylic a...

An improved water loss control additive for hydraulic cements, particularly hydraulic cements used in subterranean well bore cementing operations, is disclosed. The additive comprises an aqueous solution comprising a tetrapolymer of N-vinyl-2-pyrrolidone, acrylamide and/or methacrylamide, sodium 2-acrylamido-2-methylpropane sulfonate and/or 2-acrylamido-2-methylpropane sulfonic acid, and acrylic a...

An improved water loss control additive for hydraulic cements, particularly hydraulic cements used in subterranean well bore cementing operations, is disclosed. The additive comprises an aqueous solution comprising a tetrapolymer of N-vinyl-2-pyrrolidone, acrylamide and/or methacrylamide, sodium 2-acrylamido-2-methylpropane sulfonate and/or 2-acrylamido-2-methylpropane sulfonic acid, and acrylic a...

Novel 13-spiro-2'-[tetrahydrofuran]-milbemycins of the formula I (I) in which X represents one of the groups -CH(OR1)-, -C(=O)- or -C(=N-OH)-; R1 represents hydrogen or a OH-protecting group; R2 represents methyl, ethyl, isopropyl or sec.-butyl or the group -C(CH3)=CH-A in which A represents methyl, ethyl or isopropyl; and R3 represents hydrogen; C1-C10-alkyl; C1-C10-alkyl substituted by...

A paper machine trailing element for use in a slice in a headbox wherein the trailing element is formed of laminations with a bead at the upper end for anchoring the element in a slice chamber with the bead formed of laminations with fibers on the outer surface in the machine direction and in the cross-machine direction within the bead so that the element has a greater stiffness in the machine dir...

In the case of an arrangement comprising a gasifier and a direct reduction shaft furnace positioned above it and which is connected to the gasifier by a connecting shaft, the direct introduction of the reduction gas obtained in the gasifier, even in the case of a high dust proportion, is made possible in that the sponge iron particles are discharged through several radially positioned screw convey...

Synergistic combinations of dsRNAs and anti-viral agents in the treatment of viral diseases indicates dsRNA, especially mismatched dsRNA, plays a powerful and versatile role as a core drug in combination therapy for human viral pathogens, notably for ARC and AIDS.

Synergistic combinations of dsRNAs and anti-viral agents in the treatment of viral diseases indicates dsRNA, especially mismatched dsRNA, plays a powerful and versatile role as a core drug in combination therapy for human viral pathogens, notably for ARC and AIDS.

A combination toy in the form of a spherical body is proposed, which is subdivided into great circle and meridian sectional planes. On the outer spherical body surface is provided a plurality of sliding parts operatively connected with holding and connecting members. The toy essentially comprises an inner spherical body, a central spherical body formed from several segmental parts and an outer sph...

A combination toy in the form of a spherical body is proposed, which is subdivided into great circle and meridian sectional planes. On the outer spherical body surface is provided a plurality of sliding parts operatively connected with holding and connecting members. The toy essentially comprises an inner spherical body, a central spherical body formed from several segmental parts and an outer sph...

The real time actual and reference values of parameters pertinent to the key safety concerns of a pressurized water reactor nuclear power plant are used to generate an integrated graphic display representative of the plant safety status. This display is in the form of a polygon with the distances of the vertices from a common origin determined by the actual value of the selected parameters normali...

A method and apparatus for pressure relief of a nuclear power plant includes the feeding of fluid from an outlet opening of a containment through a filter to a stack. The filter is operated with sliding pressure regulated as a function of the pressure in the containment.

There is disclosed a hydroturbine which exploits the potential energy of a water column of high pressure - changing it into the speed of the stream action of the flow over the rotor blades and by their rotating moment increases the speed of the jet by the press-back force pressing out the water flow of the turbine system. The stator body (1) is a cylindrical cave (27) of oval shape in which is pla...

There is disclosed a hydroturbine which exploits the potential energy of a water column of high pressure - changing it into the speed of the stream action of the flow over the rotor blades and by their rotating moment increases the speed of the jet by the press-back force pressing out the water flow of the turbine system. The stator body (1) is a cylindrical cave (27) of oval shape in which is pla...

A spontaneous convection type solar heat collector arrangement including a reservoir in which a fluid is disposed. The reservoir includes an upper portion, a lower portion and an inner surface. At least one double-tubing type solar heat collecting tube having an open end and a closed end is positioned within at least one connecting opening provided in the lower portion of the reservoir. Insulating...

The rails and tracks in the carriage housing are for bearing components in the form of rollers (20,24) and shafts (21). They are held in position by sprung and adjustable shaft holders (22). The carriage movement along the guide can be adjusted externally to a light sprung or rigid gap-free movement. Several such carriages can be coupled together in parallel by means of coupling rails.

One broad side (37) of the box-shaped table top is covered with a work surface of light-permeable material. The opposite broad side (36) is covered with a work surface of opaque material. Through one narrow side (39) of the table top, light cassettes (40,41,42,43,44,45) with different characteristics can easily be incorporated.