Abstract: The invention relates to a solar energy collector or cell comprising a fixed spherical mirror placed on the ground by its convex face and a boiler in which circulates a heat-transfer fluid and which is movable about the center of the mirror. The boiler comprises a low concentration boiler surmounted by a high concentration boiler. The spherical mirror has a visor in the form of a spherical sector which moves on the periphery of the mirror.

Abstract: A method of making plate material consisting of agglomerated clay-based particles, comprising providing a liquid particle suspension such as slip within a gap left between two continuously travelling confronting electrodes at a given voltage applied thereto, subjecting the suspension to an electrophoretic action between said electrodes and an adjacent counter-electrode subjected to a different voltage and controlling the formation and thickness of the electrophoretic deposits on said first electrodes so that when they leave the electrophoretic field they will be fused together with their outer surfaces having contacted each other and recovering said plate formed continuously from both layers of electrophoretic deposits.

Abstract: Process for the extraction of diene or aromatic hydrocarbons from petroleum hydrocarbon fractions employing sulfonamides as solvents. Also described are new sulfonamides useful as solvents for the extraction process.

Abstract: The present invention relates to a projector comprising two optical systems enabling transparencies to be projected with cross-fading, in 3-D and with double-width panning, said projector operating with a single transparency distributing and recuperating magazine, in which the transparencies are arranged in the same order as if they were to pass in a single-lens projector; said projector comprises four parallel transparency guide slots, which are parallel to one another and transverse with respect to the axes of two optical systems in which the transparencies circulate in pairs, said guide slots being extended by a switching means whose role is to cause the transparencies which have already been projected to pass from the forward guide slots into the return guide slots, and thus to cause the transparencies to return to the same compartment of the same magazine from which they left. These displacements are possible due to a recuperator having multiple functions.

Abstract: A process for fluidizing a particulate solid and wherein the process uses an apparatus having a chamber with a fluid distributor at its base and containing at least one elementary compartment formed by a conduit having a cross-section "S", at least one obstacle at its base arranged symmetrically in relation to the axis of the conduit, each such compartment being fed with a quantity of the particulate product and with an upwardly flowing fluid, the particulate material being of at least 1 mm granulometry, the obstacle or obstacles of each cell being adapted to define an open inlet section "s" at its base for the fluid of a dimension given by 0.12.ltoreq.s/S.ltoreq.0.

Abstract: Method for molding articles from agglomerated particles utilizes a press and a plurality of molds mounted to circulate in a closed path. After the pressing step a mold is aligned at one end of a row of molds, the row is placed under pressure and the articles therewithin caused to set. Simultaneously a mold is withdrawn from the other end of the row. The latter mold is then emptied, and the emptied mold returned to the press. The aligned molds are fastened together during the setting step. The invention includes apparatus for carrying out this process.

Abstract: The invention relates to electrical insulators having increased resistance to partial discharges and electrical equipment comprising such electrical insulators.These electrical insulators are formed of a macromolecular material in which is incorporated a chelate of general formula: ##STR1## wherein: R.sub.1, R.sub.2 and R.sub.3 each represent hydrogen or a alkyl, aryl, or cycloalkyl group or a heterocyclic group containing a sulphur, oxygen or nitrogen atom, whereby said group or heterocyclic group may be substituted by one or more halogen atoms;X and Y represent oxygen or sulphur;The total number of carbon atoms in the metal chelate is between 5 and 25;M.sup.n+ stands for a metal ion, andN is an integer from 1 to 4, this enolate or thioenolate being present in said insulating material in a sufficient amount for promoting extinction of partial discharges, said amount not exceeding a value which would substantially alter the physical properties of the insulator, such as its volume resistivity.

Abstract: A device for forming acoustical images comprises an ultrasonic source, a linear array of first receiving transducers for receiving the echoes from a target illuminated by a source. The signals from the linear array of first receiving transducers are processed by a system comprising an oscillator at a frequency higher than that of the source, and, for each said receiving transducers, a mixer, a filter for separating the components of the beating frequency and a transmitting transducer.

Abstract: The invention pertains to drug oil-free compositions, notably aqueous injectable compositions acting as non-specific adjuvants to stimulate in a host the immunitary responses to different antigens. The active principle of these oil-free compositions is N-acetyl-muramyl-L-alanyl-D-isoglutamine.

Abstract: The machine comprises two electrodes connected to a high frequency electric current generator and adapted to subject the object to be heated to an electric field. The first electrode comprises a table provided with at least one opening through which projects a roll for guiding the travel of the object. A plurality of pairs of electrically insulating rollers for exerting pressure on the object are mounted on the table and at least one pair is movable with respect to the others so as to curve the object as heat treatment proceeds. Section members supporting the rollers extend the table of the electrode and are in electric contact with a support box structure for the second electrode which is connected to earth.

Abstract: According to the invention, the productivity of cultivated plants is controlled by a microbiological process. At least one telluric microorganism having a favorable rhizospheric effect on a plant is embedded in a polymer gel. Fragments of the gel are then inoculated into the rhizosphere of the plant. The invention also relates to a process for preparing the required fragments of polymer gel. Polymerization of the gel is carried out in the presence of a culture of the desired microorganism, and the polymer block is thereafter broken up prior to use.

Abstract: The invention relates to new water-soluble agents which are effective as immunizing adjuvants. These adjuvant agents are the methyl, ethyl or propyl esters of 2-(2-acetamido-2-deoxy-3-O-D-glucopyranosyl)-D-propionyl-L-alanyl-D-isoglu tamine and of 2-(2-acetamido-2-deoxy-3-O-D-glucopyranosyl)-D-propionyl-L-alanyl-D-glutam ic acid, the 2-(2-acetamido-2-deoxy-3-O-D-glucopyranosyl)-D-propionyl-L-alanyl-D-(.alph a.-methylamide)-glutamic and 2-(2-acetamido-2-deoxy-3-O-D-glucopyranosyl)-D-propionyl-L-seryl-D-isoglut amine, the 2-(2-acetamido-2-deoxy-3-O-D-glucopyranosyl)-D-propionyl-L-seryl-D-glutami c acid and their derivatives. They are particularly useful to prepare adjuvant medicinal compositions, used for increasing the efficiency of vaccines.

Abstract: The present invention relates to novel immunological agents effective as adjuvants for stimulating an immune response to various types of antigens. The adjuvants do not cause objectionable reactions and they are easily purified. The invention additionally relates to a process for producing the novel adjuvants.

Abstract: The powder for extinguishing fires of liquid substances or of a mixture of liquid substances forming part of the group comprising liquid metals and hydrocarbons contains at least two salts of alkali metals or alkaline earth metals in proportions such as to obtain a composition having a melting point which is lower than the flame temperature of the liquid metal or of the mixture of metals to be extinguished. The powder contains water of crystallization combined with at least one of the salts, the proportion of water being within the range of 1 to 15% of the weight of the powder.

Abstract: The invention relates to a method of detecting electromagnetic or corpuscular radiation. In order to detect a radiation photon or particle, a homogenous particle of superconducting material of the first form is made to change from the metastable form of the superconducting state to the normal state by the action of a photo-electron expelled by the impact of the photon or particle of radiation on the particle of material.

Abstract: The invention provides a holographic device for X-ray or .gamma. ray imaging, especially for tomography in the medical field, in which low frequencies of radiation can be included in the image construction by virtue of having a mask with a particular transmittance law.For example the transmittance law of the mask may be such that transmittance is a function of x.sup.2 +y.sup.2 or of .sqroot.x.sup.2 +y.sup.2 where x and y are spatial co-ordinates of the mask.

Abstract: An altazimuth orientation support for a panel for adjusting the panel in elevation and in azimuth including a vertical pivot and support therefore enabling rotation of the panel around a vertical axis, a mounting integral with the pivot for carrying the panel and enabling pivotal adjustment of the panel about a horizontal axis, a framework extending rearwardly from the panel to a circular trackway and means for driving the framework along the trackway for azimuth orientation, and means associated with the framework for adjusting the panel about the horizontal axis.

Abstract: The invention relates to accumulators comprising halogen electrodes operating with fused halide based electrolyte.Such accumulators can include an electrochemical chain aluminium/mixture of aluminium halide and alkalin metal halide/metallic derivatives introduced into graphite.Application to the constitution of accumulators including halogen electrodes for considerable storage of halogen.

Abstract: A process of making and spreading, on a highway, a non-skid highway surfacing composed of aggregates mixed in a bituminous binder, according to which aggregates mixed in molten asphaltic bitumen are prepared, which are screened at the same time as they are spread, with the result that a relatively thick surfacing carpet is obtained which is composed of two superposed layers, the top layer of which is constituted by the chips retained by the screen.

Abstract: A process for the measurement in vivo of the degree of bone consolidation, characterized in that it consists of implanting directly on the surface of the bone a transmitter with its power supply circuit, the oscillation frequency of the transmitter being capable of varying about a predetermined value during stresses applied to the bone to which the transmitter is secured. Signals emitted by the transmitter are received on a suitable external receiver positioned adjacent the transmitter. The receiver output signals are utilized for various purposes, such as checking, measurement and recording.