Abstract: A spacer grid assembly provides elastic support and secure positioning of fuel elements in a nuclear reactor. This spacer grid assembly comprises two families of thin perforated sheets, the sheets of one family being parallel to each other and perpendicular to the sheets of the other family. The interlaced assembly of these interfitting sheets forms a three-dimensional lattice of square-sectioned cells for positioning and securing the fuel elements vertically. This spacer grid assembly comprises large recesses within the cell walls that define the spring means. The spring means comprises two plates shaped as a flexible vault, a sheet stud connecting these plates, and two triangular strips integral with this sheet stud on one side and opposite each other on this same side, and ending in circular and protruding pads. These pads contact the fuel element and transmit the bearing power of the spring means to the fuel element.

Abstract: A multiple output optical scanning probe consisting of a one power focussing telescope and a field splitting system with a plurality of imaging systems.

Abstract: A negative feedback amplifying circuit comprises an amplifier connected to a load, a voltage negative feedback circuit which negatively feeds back the output voltage of the amplifier to the input side of the amplifier maintaining a frequency selection characteristic, and a current negative feedback circuit which negatively feeds back a current signal obtained by detecting the current flowing through the load to the input side of the amplifier maintaining a frequency selection characteristic. The voltage negative feedback circuit has a frequency selection characteristic comprising a dip at a specific frequency f.sub.0. On the other hand, the current negative feedback circuit has a frequency characteristic comprising a peak at a specific frequency f.sub.0.

Abstract: A boiler noise suppressor has one truss (2) mounted on a cover of an inlet flange (1), a perforated expansion nozzle (5), a pipe system (7) made of a several hundreds of pipes, a perforated outlet nozzle (8), at least one truss (11) mounted on a collar of the outlet nozzle. The pipe system (7) can be additionally cooled in a parallel-current- or a counter-current manner preferably by air or water. The boiler noise suppressor can be connected directly to the exhaust of blow-out steam of a single boiler or in a parallel connection to form batteries of suppressors by a connection with exhausts of blow-out steam from several boilers. The application of the noise suppressor renders it possible to reduce the noise level by more than 50% from 140-160 dB to 70-80 dB.

Abstract: A typewriter (not illustrated) using a daisy wheel as the type carrying member and having a unit which drives the daisy wheel element to rotate about its axis and a device for coupling the daisy wheel element onto the drive unit.The coupling device substantially comprises a pin which engages a hole in the daisy wheel element; first resilient means carried by the unit and operable to transmit to the daisy wheel element an axial thrust in a first direction; second resilient means operable to transmit to the daisy wheel element an axial thrust in a direction opposite the thrust generated by the first mentioned means; and manual control means which act on the said second resilient means in such a way as to compensate, if actuated, the thrust generated by such second resilient means.

Abstract: A fuel supply system for producing an emulsified fuel continuously is disclosed. The emulsion is maintained by recirculating the emulsion and adding a ratio of fuel and water to the system to achieve a desired fuel/water ratio in the recirculation loop.

Abstract: The method of preparing aqueous dispersions of copolymers of styrene dibutyl maleate and acrylic or methacrylic acid or monobutyl maleate consists in adding a monomer mixture comprising styrene in the amount of 40-90% by weight, dibutyl maleate in the amount of 10-60% by weight acrylic or methacrylic acid or monobutyl maleate in the amount of 1.0-10.0% by weight in relation to the sum of styrene monomer and dibutyl maleate into the emulsion water known constituents such as:ionic emulsifier - non-ionic emulsifier, buffer, sodium acrylate, N-methylolmethacrylamide to which, prior to polymerization, an alkylene glycol comprising 2-6 carbon atoms in the alkylene group is added. The alkylene glycol is added in the amount of 1-6% by weight in relation to the sum of styrene monomer and dibutyl maleate while, the ratio of alkylene glycol to the methacrylic acid or monobutyl maleate contained in the monomer mixture is 1:0.2-2. The polymerization process is conducted at a temperature of 70.degree.-90.degree. C.

Abstract: A method and apparatus for electrical transmission, wherein an electric current is applied to the primary winding of a mains transformer the secondary winding of which consists of at least one spiral, and a corresponding electric current is collected at the secondary winding of at least one distribution transformer, the primary winding of which consists of said spiral, while the secondary winding of the distribution transformer is mounted in a removable member.

Abstract: Process for monitoring the instantaneous or momentary state of an electric circuit having to function in a range limited to two states, namely a normal state corresponding to the passage of a nominal intensity in a conductor and a critical or threshold state corresponding to a threshold intensity and in particular a zero intensity in the said conductor, using the detection of possible variations in the resistance of a magnetic layer or "magnetoresistor" of the influence of the magnetic field due to the intensity of the electric current circulating in a conductor and whereof part of the path is located in the vicinity of at least one oriented thin magnetic layer, wherein the said detection is carried out by means of a differential measurement of the magnetoresistance of at least two adjacent and separate magnetic layers, whereof one is subject to the field of the circuit to be monitored and the other is subject to the field of a reference current, the circuits and layers being arranged also in such a way as to

Abstract: The present invention relates to a cement which may be used for the fixation of osseous prostheses. This cement is obtained by hardening of a mixture comprising:(a) at least one epoxide resin having a high reactivity and a very low toxicity, consisting of a diepoxide of a glycidyl ether of bisphenol A;(b) a reactive, non-toxic suppling resin, consisting preferably of hydroxyl-terminated polybutadiene;(c) a mineral filler in powder form;(d) a hardener capable of reacting with said epoxide resin to effect hardening thereof, and(e) a hardening accelerator.The invention is more particularly applicable to the fixation of hip prostheses.

Abstract: The nuclear boiler comprises at least one heat exchanger located externally of the reactor vessel in order to effect heat exchange between the liquid metal coolant in the form of liquid and water to be vaporized and superheated together with a main storage tank connected to the reactor vessel for receiving liquid metal and inert gas. A main storage tank pipe system fitted with valves consists of a first overflow pipe for connecting the top of the reactor vessel to the bottom of the storage tank, and at least one second pressure-equalizing pipe between the top of the reactor vessel and the top of the storage tank. Controlled-atmosphere compartments forming the reactor containment structure and containing the unclear steam supply systems provide biological protection for operating personnel and guard against impacts of external origin.

Abstract: The invention relates to a process for the production of titanium-based alloy members by powder metallurgy.This process consists of:(a) preparing a titanium or titanium alloy powder having a grain size distribution between 100 and 1000 .mu.m,(b) depositing on said powder a coating of a material such that on contact with the titanium or titanium alloy it forms a liquid phase at a temperature T.sub.1 which is below the allotropic transformation temperature T of the titanium or titanium alloy constituting the said powder,(c) introducing the thus coated powder into a mould, and(d) hot compressing this powder in the mould at a pressure of 10 to 30 MPa at a temperature between T.sub.1 and T for a time such that a complete densification of the powder is obtained.Application to the construction of discs for turbines with integrated blades.

Abstract: There is described an optical finder system for use with video cameras of the type having a tri-color separation color filter. Positioned in the finder optical path is an optical member onto which the image of an object to be picked up is projected and the optical member has an irregular pattern which is the same or similar to that of the color filter, whereby Moire fringes similar to those produced by the object image in cooperation with the color filter are produced on the finder focussing or imaging surface.

Abstract: A signal spectrum display apparatus comprises a plurality of band-pass filters respectively having filtering bands of different center frequencies and operating to filter an input signal thereby to band-divide the input signal fed through an input terminal a plurality of rectification and charging circuits connected respectively to said band-pass filters, a display section having displaying systems of the same number as the band-pass filters respectively corresponding to the band-pass filters and for displaying the outputs of the rectification and charging circuits, and a switch connected between a point between the rectification and charging circuit and the display section, and the ground.

Abstract: A reciprocating device comprises an endless member such as a chain or a belt having a forward and a backward side spans and driven to circulate in one direction, a reciprocating member guided substantially parallel to both the forward and backward side spans of the endless member, engaging mechanism provided on the reciprocating member which selectively engages with the forward or the backward side span of the endless member, and a changeover mechanism for switching the engaging mechanism from either one of the forward or backward side span of the endless chain to the other at the preselected limit position of the reciprocation movement range of the reciprocating member. The reciprocating member moves according to the movements of the forward side span of the endless chain upon engagement of the engaging mechanism to the forward side span of the endless chain, and moves respectively when engaged with the backward side span of the endless chain.

Abstract: The present invention relates to an assembly for filtering by switching, comprising at least one filter with switched paths and means for applying to each of the filters signals for controlling switching of the paths, said assembly further comprising means for memorizing the output signal of the filter and a mixer circuit whose input receives at a given instant the signal to be filtered; a second input receives at this instant the memorized value which the output signal had, an instant earlier, separated from the instant in question by a whole number of periods of the useful component of the input signal. The invention is applicable to harmonic analysis, telecommunications, filtering of composite signals.

Abstract: A moving-coil type stereo pickup cartridge comprises a vibration mechanism, including a stylus for tracing the groove of a sound track on a record disc, at least one coil plate provided in the vibration system and adapted to vibrate in response to vibrations of the stylus, and a structure for forming a magnetic field for the coil plate. The coil plate comprises a thin insulative substrate and a pair of left and right coils substantially symmetric with respect to a center line and formed by an electrically conductive thin film placed in a spirally wound pattern on at least one surface of the substrate. The magnetic field-forming construction comprises a permanent magnet and a pair of yokes adapted to clamp the permanent magnet. The pair of yokes have confronting surfaces for defining a gap in which the coil plate is interposed and a recessed substantially reverse V-shaped notch or cutout. The notch is defined by edge parts or facets.

Abstract: This invention provides a high efficiency polarized light source and system for the projection of 3D motion pictures adaptable to a standard motion picture projector device. The projected light beam is compressed into a shape more nearly approximating the aperture shape so that substantially less than 40% of the light is lost at the gate.

Abstract: An insulator comprising a rod made of continuous glass fiber impregnated with epoxy resin, metal end fittings, and a polymeric sheath. The rod is tightly embedded in the sheath and the ends of the rod are pressed into the fittings. The sheath consists of alternately mounted segments of two types: spacing sleeves made of elastic material and externally profiled sleeves made of stiff material. The spacing sleeve has beads at the ends. In order to transfer axial forces, the spacing sleeves are partly covered by the profiled sleeves, said covered portion including the beaded ends. The method by which this insulator is made consists in that, first, the spacing sleeves, made of silicone rubber, are cast directly onto the rod by the pressure-injection method; second, the rod is covered by a layer of adhesive agent from the silicone group and, third, in the interspaces formed between the spacing sleeves, the profiled sleeves are cast in a split mold by means of the injection method.