Abstract: High current ion implanter of the type comprising, in a vacuum enclosure, an ion source, means for extracting these ions, scanning means and a sample-carrying target, wherein the scanning means are of the electrostatic type and comprise deflecting plates connected to a sawtooth-variable voltage source and wherein a regulatable magnetic refocussing means are disposed in the vicinity of said plates.A particular application of the invention is to the construction of ion implanters intended for use in the manufacture of semiconductors.

Abstract: The method consists of subjecting said muds to a particle size grading to concentrate the lead and zinc contained notably in the fines, and recovering said fraction containing the lead and the zinc, the other fraction being recyclable to the blast furnaces. The invention is useful in the preparation of feed materials for Waelz-Berzelius furnaces.

Abstract: A process for depositing a layer of a semiconductor composition comprising elements M(III) and M'(V) selected from group III and group V elements, respectively onto a substrate. The process comprises: contacting the substrate with a coordination compound in the gaseous phase, the compound having the formula: ##STR1## wherein M(III) and M'(V) are bonded to one another by a donor/acceptor bond and wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are chemical radicals other than hydrogen with at least one of the radicals R.sub.1, R.sub.2, and R.sub.3 being an electron donor serving to stabilize the donor/acceptor bond between elements M(III) and M'(V). The process further comprises decomposing the coordination compound so as to break the chemical bonds between the radicals and the elements M(III) and M'(V) without breaking the donor/acceptor bond, so as to cause the semi-conductor composition to deposit onto the substrate.

Abstract: This invention relates to compounds having the formula ##STR1## in which R.sub.F is a perfluoro radical C.sub.n F.sub.2n+1 with n=1-20, and R is a C.sub.1-20 alkyl radical, a C.sub.4-15 cycloalkyl radical, a C.sub.5-20 cycloalkyl-alkyl radical, or a C.sub.6-20 aromatic radical.Said compounds constitute valuable intermediates for the synthesis of surface-active agents.

Abstract: Each spinning ring of a ring-frame spinning device is carried by a fluid bearing supplied with compressed air for centering and lifting the ring. The flow of compressed air is selectively interrupted or at least reduced by means of an automatic or hand-operated valve or cock in order to reduce or suppress the ring-lifting action. A braking action is thus produced on the ring as it is brought into frictional contact with a top horizontal radial surface of a ring carrier or stator. The braking action can be applied selectively to one or a number or all the rings of any ring spinning frame employed in the textile industry.

Abstract: Process and device for ensuring the displacement, in a tunnel kiln in particular for high-temperature firing of ceramic products, of firing plates traversing the kiln of the type wherein the whole row of plates are pushed at one end of the kiln and roll on balls supported in rolling paths. Parallel grooves are formed on the lower face of the plates to receive the balls and more hollow portions and more protruded portions are provided on the lower face of the places in the said grooves so that when a ball passes under a said protrusion it locally supports a plate and simultaneously relieves of the load the balls of the same rolling path in proximity to the said protrusion what gives a better rolling of the plates and reduces the flow of the balls through the kiln.

Abstract: Various vacuum ultraviolet monochromators embodying a rotatable diffraction grating and fixed entrance and exit slits, and working at a predetermined magnification are disclosed which provide improved optical performances by a correction of the odd terms of the wavefront aberration. In one group of instruments the fixed angle 2.theta. between the entrance and the exit beams is 90.degree. and the magnification 1. In another group, grazing incidence instruments are considered, 2.theta. being equal to 166.degree..

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: The measuring cell is composed of at least one cavity hollowed in a block of chemically inert material or material made chemically inert at least at the surface. The cavity defines a first cylindrical space whose bottom is, over a reduced part of its diameter, extended by a second space defining the measuring chamber proper, of conical, frustoconical or substantially hemispherical shape. The first cylindrical space is designed to receive a measuring electrode terminated by a magnetic torus and, applied, and if necessary held by means of a ferromagnetic ring, against the latter, a membrane, while inlet and outlet ducts for the liquids to be assayed are formed in the block. The cell is especially useful for micro-assays of biological fluids.

Abstract: Two current supply conductors connected to an emissive filament located within a vacuum enclosure are each constituted by a leak-tight tube formed of material other than a heavy metal which traverses the enclosure wall through a leak-tight bushing, and by a conductor of electrically conductive heavy metal such as copper which is placed inside the leak-tight tube and completely isolated from the vacuum enclosure. This arrangement permits the continued use of heavy metals such as copper for current supply to ion sources without any attendant danger of heavy metal ion formation in the emitted beam.

Abstract: New organo-lithium initiators, their synthesis, and their use. The initiators have the formula: ##STR1## in which R" is either a hydrogen atom or a methyl radical; either n is 1, in which case R' = H and m and p are integers, the sum of which is between 0 and 10 inclusive, or n is 2, R' then being an alkyl radical of 2 to 8 carbon atoms and m =p =0; and R is an alkyl radical of 1 to 4 carbon atoms.The initiators are prepared by reacting compounds of the formula: ##STR2## with an alkyl-lithium RLi in a non-polar solvent in the absence of any polar solvent or complexing agent.The initiators are used to prepare polydienes of high stereoregularity by reacting with a diene, and the polydiene is used to prepare a three-block or star copolymer by reacting with an anionically polymerizable monomer.

Abstract: Water soluble agents effective as immunological adjuvants for stimulating in the host the immune response to various antigens, comprising an acyl-muramic acid group, wherein acyl means acetyl or glycolyl, and a short peptide chain linked to said acyl-muramic acid group, the first and second amino acids of said peptide chain being preferentially alanine and glutamic acid respectively.

Abstract: This device comprises a generator of electric signals adapted to generate a first signal whose frequency is proportional to the speed of the output shaft of the transmission and whose amplitude is a function of the load of the motor with which this transmission is associated, and means for producing from said signal the ratio change characteristics.The device further comprises means for producing from the generator signal an additional electric signal whose amplitude is a function of the frequency of the first signal, means for weighting and comparing said first signal and said additional signal so as to obtain a signal representing periodically the desired state of the transmission, and means for memorizing the desired state of the transmission connected to the measuring and comparing means to change the transmission from one ratio to the next ratio as a function of the signal produced by the weighting and comparing means.

Abstract: The invention relates to a step by step motor and/or brake device through controlled translation, comprising two assemblies arranged substantially coaxially about the same shaft, one of them being slidable along said shaft, and the other assembly being rotatable about said shaft.The device according to the invention may be used in mechanical, pneumatic or electrical equipments, in automatic arrangements, in servo-controls, as modifiable drives, step by step motors, step by step brakes.

Abstract: The apparatus comprises a principal light source, condenser, lenses, object and image planes movable with respect to one another and an auxiliary light exposure source. The condenser is constituted by two thin stepped lenses between which is arranged a corrector screen for the variations in illumination in the image plane due to the inclination of the useful beam to the axis of the system. This screen operates perpendicularly to its surface, the constituent elements of the source, of the condenser and of the pupil of the lenses used being fixed with respect to one another and movable in a single unit relative to the document to be reproduced according to the focal length of said lens determining the size of the document. The apparatus is useful for the reproduction of transparent documents in black and white or in color.

Abstract: The easy direction of magnetization of an amorphous magnetic film is brought in the plane of the film by annealing this film in an oxygen-free atmosphere composed of a gas selected from the group comprising argon, neon, krypton and xenon at a temperature below the temperature of crystallization of the alloy which constitutes the film. The depth of penetration of the rare gas into the film is adjusted by modifying the parameters of annealing temperature and time in order to modify the easy direction of magnetization to a greater or lesser depth within the film.

Abstract: An egg white substitute is prepared by a process involving the acidification of milk serum at a pH of 2 to 6, heating between 45.degree. and 80.degree. C. for five to twenty minutes, then sudden cooling to a temperature comprised between 15.degree. C. and 25.degree. C. and subsequent alkalinization to a pH comprised between 7 and 9.

Abstract: The trawl-net apparatus includes, between the net and the bottom, a closing-opening mechanism provided with a first control device. The mechanism holds the entrance of the bottom closed while leaving the rear of the net open. Under action of its control device, the rear of the net is caused to communicate with the entrance of the bottom. A folding over closing system is provided with a second control device and under the action of this control devices allows the mouth fold back rearwardly, then ensures, by a stopper, the closing of the mouth. The trawl-net with controlled opening and closing is advantageously used for selective gathering of pelgic micro-necton.

Abstract: A psychrometer or pick-up for measuring the content of water in a gas flow comprises a first sensor or probe for measuring the dry temperature of the gas and is arranged directly in the flow of gas, a second sensor or probe for measuring the wet temperature of the gas and is surrounded by a sheath of a material capable of absorbing a volatile liquid, the second sensor or probe with its sheath also being arranged in the flow of gas, a pair of screens mounted on opposite sides of the second sensor and the sheath for protecting the sheath against thermal radiation, and a wetting device, preferably formed by a dosing pump connected to a nozzle, for injecting successive doses of a predetermined amount of the volatile liquid directly into the interior of the sheath and onto the screens to prevent excessive and insufficient moistening of the sheath and the screens.

Abstract: A process and device for micro-analysis in which a thin layer of anticathode material is scanned by means of a pencil-beam of electrons. The X-rays formed are received by a thin layer of converter where they give rise to a current of photoelectrons which is subject to an intensity measurement by an analyser.From the measurement of intensity of the photoelectrons are deduced the properties of the zone of the anticathode which receives the pencil-beam.