Abstract: A magnetic field having an alternate component in a predetermined direction is produced in a zone and electrons are injected into this zone perpendicularly to said direction. To this end a winding is connected to a source for supplying current pulses having a predetermined duration. A split tube is placed coaxially within the winding and has an inner wall which provides periodic or nearly periodic variations. The split tube is formed of material having good electrical conductivity and has a skin thickness which is considerably smaller than the tube thickness at the frequency corresponding to the reciprocal of the time-duration of the current pulses.

Abstract: The present invention relates to a process for the preparation of unsaturated sulphones. It relates to a process in which unsaturated sulphones are prepared by sulphonation of the corresponding diene compound in the presence of a palladium catalyst, the sulphonating agent being a sulphinic acid or a sulphinate in the presence of an acid. The sulphones obtained are synthesis intermediates, particularly in the preparation of vitamins A and E.

Abstract: Novel 2-nitronaphthofuran derivatives are of the formula ##STR1## in which the linkage between the furan ring and the naphthalene nucleus is formed in the 1,2-, 2,3- or 2,1-positions of the naphthalene, and R, which can be located in a free position of the napthalene, represents a halogen atom or a methoxy group. They are prepared by condensing bromonitromethane with ortho-hydroxynaphthaldehydes and provide useful cell growth regulators.

Abstract: The invention relates to contact-making between a gas phase, at least one liquid phase, and at least one comminuted solid phase.The process uses a cell or compartment provided with at least one deflecting means such as the sloping wall 3 designed to impart an overall circulatory motion to the solid phase and with gas phase distributor 1, supplying this compartment with solid products, supplying this compartment with a liquid phase so as to cover entirely the solid when at rest, and feeding the compartment with the gas phase through the distributor 1 for the purpose of generating in said compartment a periodic pulsing stage consisting of gas-phase decompressions and layer contractions.The invention permits achieving an intimate contact between three distinct phases for the purpose of transfer(s) or of reaction(s) between these phases.

Abstract: A method and apparatus for the separation of an emulsion of at least one dispersed phase emulsified in at least one continuous phase of different density wherein the emulsion is passed into a vessel and axially through a fixed coalescing bed for coalescing the dispersed phase, and continuing the flow over a guide wettable by the dispersed phase whereby the coalesced dispersed phase travels along the guide axially to establish a layer of the coalesced dispersed phase and the continuous phase passes substantially radially outwardly through the guide to establish a layer of the continuous phase, the interface of the dispersed phase and the continuous phase being maintained at approximately the midpoint of the guide.

Abstract: The polymer films of the invention contain reactive groups and are obtained from phenols of the formula ##STR1## in which R denotes an acyl group with 1 to 7 carbon atoms, a hydroxy, carboxy, alkoxycarbonyl, amino, alkylamino or phenylamino group, andn is an integer, which may be 0 in the case where R is an acyl group.The films are prepared by electrolytic polymerisation on metallic surfaces and can be used to graft various materials reacting therewith, as intermediate layers.

Abstract: The invention relates to a static semi-conductor electrical energy converter.The converter is of the type comprising a power stage 5 provided with at least one power transistor 7, and a control stage 1 furnishing a control signal S.sub.C appropriate for the conversion to be carried out; according to the invention, each transistor is a transistor having a voltage V.sub.CEX greater than its voltage V.sub.CEO and is associated with an intermediate stage 4 for treatment of the control signal S.sub.C. This stage 4 is adapted to drive the base of the said transistor to guarantee operation thereof over a voltage range extending from 0 to V.sub.CEX thus making it possible to take advantage of the improved voltage V.sub.CEX of the said transistor.The invention is applicable in particular in the case of inverters adapted to convert a continuous electric voltage into an alternating electric voltage.

Abstract: Reconstruction of two-dimensional distribution of attenuation coefficients or sound velocities in a cross-sectional plane of an object is achieved by carrying out a plurality of measurements of absorption or of flight time with ultrasound bursts directed by elementary transmitting probes along several different incidences in the sectional plane. Switching between successive measurements is carried out by electronic scanning, without movement of the individual probes. Focusing of the burst energy transmitted by a group of probes is achieved by applying a same electrical signal to the probes with appropriate delays. The secured signals are stored and, after completion of the scanning, they are combined for computation of the distribution.

Abstract: New ferrofluids.They consist essentially of an aqueous sol of polyoxyanions of Fe(III) and at least one metal of oxidation degree II from the first series of transition metals, with an associated cation, notably selected from H.sup.+,N (CH.sub.3).sub.4.sup.+ and N(C.sub.2 H.sub.5).sub.4.sup.+.Application for example for obtaining levitation or self-sustentation systems, as well as for forming contactors or rotating paths.

Abstract: Glasses containing fluorine. These glasses are characterized by the fact that they contain at least 25% in moles, approximately, of a fluoride or a mixture of fluorides MX(X.sub.1).sub.2, in which:X and X.sub.1 each represent a fluorine atom,and M then represents a metal chosen from among the group consisting ofgallium, iron, chromium, vanadium, indium, and the rare earths,or X represents an oxygen atom,X.sub.1 represents a fluorine atom,and M then represents a titanium atom, it being understood that the said glasses contain no hydrofluoric acid as a network former and that, in the case in which M represents a gallium or indium atom, the glasses do not contain more than 15% in moles of BaPO.sub.3 F.Application notably in obtaining glasses containing various cations conferring particular optical or magneto-optical properties.

Abstract: A process for the preparation of a compound of formula (V) and salts thereof ##STR1## wherein R.sub.1 is selected from the group consisting of a hydrogen atom, an alkyl radical, a formyl radical and an acyl radical;R.sub.2 is selected from the group consisting of an alkoxycarbonyl radical, a hydrazide radical, an acetamido radical, a hydroxymethyl radical, and an alkanoyloxy methyl radicalandR.sub.3 and R.sub.4 are the same or different and each is selected from the group consisting of a hydrogen atom, a hydroxyl radical and an alkanoyloxyl radical;which comprises the step of treating a compound of formula IV ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as previously defined with at least one oxidising agent selected from the group consisting of oxidising metal salts, air and oxygen.The above compounds are useful due to their antitumoral activity, and to their use as intermediates of other antitumor drugs.

Abstract: A highly luminous device for interferential spectrometry, comprises a birefringent beam-splitting interferometer combined with an optical system supplying localized fringes. As the beam-splitter element, it has at least one birefringent prism mounted along the optical axis of the device and producing an angular splitting, such as a Wollaston prism, of materials suitable for the construction of such prisms and selected as a function of birefringence and transparent over a wide range of wave lengths. The beam-splitter is placed between a polarizer and an analyzer of variable orientation to obtain flux modulation.

Abstract: The invention relates to new chemical compounds corresponding to the followings formula ##STR1## in which R is a non-hydrolyzable radical and Az represents aziridinyl ##STR2## These compounds may be used as medicaments.

Abstract: Apparatus for determining rheological parameters of viscoelastic fluids is provided. The apparatus comprises two similar cylinder-piston assemblies ending at identical flow orifices. The pistons are pushed conjointly by a motor at an adjusted speed. A differential manometer is arranged between the cylinders immediately upstream of the orifices. One of the cylinders contains fluid to be studied and the other a Newtonian comparison fluid. The strain rates of the fluids are defined by the adjusted flow rates, and the pressure differential expresses elongation stress of the viscoelastic fluid. This apparatus is applicable in the rheological study of dilute solutions of macromolecular compositions.

Abstract: Dienic and/or aromatic hydrocarbons are separated from hydrocarbon fractions employing known liquid-liquid extraction and/or extractive distillation procedures and at least one sulfonamide solvent conforming to the general formula ##STR1## wherein R', R" and 4'" can be linear or branched, saturated or unsaturated, aliphatic groups possessing from 1 to 18 carbon atoms, wherein two or three of groups R', R" and R'" can be identical, wherein one of the groups R" and R'" can be replaced with a hydrogen atom, and wherein at least one of groups R', R" and R'" is unsaturated.

Abstract: The spatial distribution of mono-energetic x-rays from a point source, is determined by a device which comprises a gas filled enclosure having a flat radiation entrance window. Flat electrodes establish an electrical field of such amplitude that there occurs conversion of said radiation into photo electrons and avalanche electron multiplication resulting in delivery of a burst or pulse of electrons per conversion whose height is an increasing function of the travel path of the electrons avalanche from the location of the conversion event to the planar outlet electrode. A detector located in a second portion of the enclosure receives the pulse of electrons and determines the coordinates and the pulse height of the pulse.

Abstract: A tube of flexible material moving longitudinally undergoes transition between annular cross section and flattened straight cross section, without change in the length of perimeter of its cross sections, by one stage of changing between the annular cross section and a rectangular cross section, and another stage of changing between that rectangular cross section and the flattened cross section through successively longer and narrower rectangular cross sections. The method is applicable to material produced by a circular knitting machine. Preferably there is a polyhedral guide within the tube.

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: The invention relates to new chemical compounds.The compounds according to the invention are compounds of the following formula ##STR1## in which one of the substituents A and B is hydrogen and the other is the radical --N.dbd.O.These compounds are suitable for use as medicaments.

Abstract: An installation for the linear treatment, such as sewing, along a curved edge, of a flexible piece of fabric or other material comprises: a sewing machine; a device for moving the piece along an axis; a work table for supporting the piece during its treatment; and a correcting device comprising: detection means for detecting the presence of the piece 1 in a zone upstream of the point of treatment and situated on one side with respect to the axis of treatment, and re-centering means comprising one part of the work table which is movable in rotation about an axis which is offset with respect to the axis of treatment and a motor controlled by the said detection means for driving the said part in rotation. The invention finds an application with cording machines in particular.