Abstract: A collapsible book rest includes a first panel having a transversely medially located rectangular opening and divided into similar side sections by a medially longitudinally extending self hinge, a rectangular second panel self hinged to the rear edge of the opening and divided into side by side and end to end sections by a transverse self hinge and a medial longitudinal self hinge colinear with the first panel longitudinal hinge. Follower slides project transversely from the front corners of the second panel and slidably engage tracks along the opening side edges and separably engage detents along the track to releasably lock the first panel sections in coplanar positions and the second panel in a depending dihedral defining position.

Abstract: A method of and circuit for applying an electronic supply to two independent load circuits. An AC generator has a variable cyclic ratio. It is connected to two parallel rectifying circuits which are in series respectively with the two loads. The cyclic ratio of the alternating signal from the generator is altered. Thus, modifying the power delivered to each of the loads, because the rectifying circuits only rectifies one alternation of the complete AC signal from the generator. The power from the generator may be delivered to one or the other load or even to both load simultaneously.

Abstract: A voltage repeater circuit for loads with a resistive component with harmonic distortion compensation includes first, second and third MOSFET transistors, respectively N-channel, P-channel, and N-channel. The drain electrode of the first transistor whose gate electrode forms an input terminal of the repeater circuit is connected to the positive terminal of a voltage source via a constant current generator and is coupled to the gate electrode of the second transistor by a first circuit designed to establish a constant voltage between these electrodes, and to the gate electrode of the third transistor, by a second circuit designed to generate a constant voltage between these electrodes. The source electrode of the first transistor is connected to the drain electrode of the second transistor and to the drain electrode of the third transistor at a circuit node which forms an output terminal of the repeater circuit.

Abstract: The device for detection with time delay and phase integration comprises detectors arranged in rows and columns. Capacitors for storing electric charges are associated with each detector. Any one point of the image is received sequentially by the detectors of a given row and each column of detectors is addressed sequentially by a shift register. The data stored by the detectors of a given row are received sequentially on a common lead by a charge-coupled device associated with each row. The function of this device is to delay the data delivered by the detectors of the same row in order to add these data in synchronism. The charge-coupled devices are located externally with respect to the rows of detectors. Their outputs are connected as feedback to their inputs in order to re-inject into the device the information previously received from a detector in phase with the information received from the following detector of the same row.

Abstract: The invention uses a strip of infra-red detectors comprising a cold screen of the type that provides a constant viewing angle for all the directors in a direction that is prependicular to the axis of the strip. Two cylindrical mirrors are set at the ends of the strip and placed in the heated part of the cryostat containing the strip and the cold screen. The shape and dimensions of the mirrors as well as their positions are chosen so that the detector placed in the center of the strip detects, through reflection in two mirrors, only cold surfaces while the other detectors detect heated surfaces, through reflection in the two mirrors, in a proportion that increases with distance from the central detector of the strip, so that, along the axis of the strip, every detector has a substantially constant viewing angle. Applications: large-sized strips, for example in space applications.

Abstract: A control circuit is provided for an alternating type plasma display panel, comprising integrated circuits which are used for the first and second electrode arrays of the panel. In the first array, the integrated circuits participate in producing selective signals and transmit the reference voltage of the sustaining signals. In the second array, the integrated circuits participate in producing selective signals, and transmit the square wave voltage of the sustaining signals and their reference voltage is floating, that is to say that it follows the sustaining signals and, during production of the selective signals, it follows the lowest potential that is possible to apply to the electrodes.

Abstract: A compass, by which under-water divers can find their direction, comprise two crossed flux-gate type magnetometers, the measurements of which are processed by logic signals to light up a set of light-emitting diodes which indicate the right direction and, if necessary, the direction and approximate value of the offset of the compass. By using non-magnetic materials and low-consumption electronics, the disturbance of the local field is considerably reduced as compared with a conventional compass. This enables divers to avoid triggering magnetically fired mines.

Abstract: A structure is provided for connection between spaced Bitter coils in a magnet with homogeneous field. The magnet is formed of several Bitter coils spaced apart from each other and two adjacent coils are connected together by two groups of conductors symmetrical with respect to a plane and in which the current components create ampere turns in opposition.

Abstract: The process is based on the time-evolutive nature of each of the elements for previously determining a subdivision of the stored image into separate zones, corresponding with the distribution of the elements in the image, and for allocating to each zone a given periodic refreshing rate (between one and N image display cycles) adapted to the evolution characteristics of elements included in the zone in question, so that an integral refreshing of the image is obtained every N cycles.

Abstract: A microwave primary source with a phase conical scan having a conical horn containing an obstacle which gives rise to a wave that propagates in the TE.sub.21 mode in quadrature with the TE.sub.11 fundamental mode in the opening of the horn; the obstacle is driven in rotation round the axis V of the horn.

Abstract: Process of manufacturing a charge transfer device wherein lower electrodes have enlarged portions and narrowed portions which mesh with the mating portions of any adjacent lower electrode, upper electrodes cover the intervals defined between adjacent lower electrodes and at least part of said enlargened portions thereof, these intervals which are not covered by the upper electrodes are subjected to an impurity diffusion.

Abstract: The invention concerns a method for smoothing, through filling, an image generated by the conversion of polar coordinates into Cartesian coordinates. A filling of these pixels not involved in the conversion is performed at the level of the signal received in polar coordinates. Artificial radials are created between the effective radials supplied in polar coordinates and the artificial radials have attributed a non-zero video signal, as a function of the video signals of the adjacent effective radials. These artificial radials are thereafter converted into Cartesian coordinates and fill the pixels otherwise not involved. The invention has application to the digital scan converted for radar display.

Abstract: The invention pertains to an examination table, the top of which can be moved along its longitudinal axis on at least one roller. The top is moved, in relation to a pedestal, by a driving shaft which is set along one and the same crosswise axis as the roller.

Abstract: The method of adjustment of an x-ray device involves a step of entry of data relating to images to be produced and of data relating to the x-ray tube to be employed, a step of computation of x-ray tube parameters and a step of adjustment of the parameters in accordance with these computations. The number of images to be produced is included in the entry of image data and performs a major role in the optimization of computation of adjustment parameters with a view to ensuring that the image-recording time is as short as possible, thereby avoiding the problem of motional blur.

Abstract: A rotating head wheel for a recorder wherein the head wheel is additionally displaceable in the direction of its axis of rotation. The displacement is produced by mounting the head wheel on a threaded spindle which rotates in the same direction as the head wheel and whose rate of rotation is variable.

Abstract: A method and device are provided for assisting in height holding in air navigation, consisting, for any point (M) of the image of the landscape flown over by the aircraft (A), located by its angle of elevation (.theta.-p) with respect to the speed vector V of the aircraft, and situated in a zone between a lower elevational limit (.theta..sub.1 -p) and an upper elevational limit (.theta..sub.2 -p), in the trajectory of the aircraft, in detecting a possible deviation between the angular speed .OMEGA. of movement of this point with respect to the aircraft, depending on the height (h,H) of subsequent crossing of this point by the aircraft, for identical piloting conditions, and an angular reference speed of movement (.OMEGA..sub.o) corresponding to a reference height (h.sub.o,H.sub.o) of subsequent crossing by the aircraft of a point having the same elevation (.theta.

Abstract: A device for calculating a discrete, moving window and non-recurrent Fourier transform, especially applicable to the processing of a pulse compression radar signal. The device includes N stages which, on the basis of samples of the input signal, each give a signal of the form: ##EQU1## where k is the index of the stage (O<k<N), m the index of the window and N the number of samples in the window, N being a multiple of four. The complex rotations of the expressions (1) and (3) are each broken down into a rotation in the first quadrant of the complex plane, a rotation common to N stages and a supplementary rotation specific to each stage, achieved by addition-subtraction.

Abstract: In a method for identification of arborescent structures detected in digital images by starting from model arborescent structures, a matching operation consists in comparing an object tree with a model tree. The method involves computation of the distance between the object tree and the model tree in accordance with a so-called Selkow iterative method which utilizes predefined cost values for elementary operations of label-changing, insertion or destruction of sub-trees in the descriptive lists of the trees to be identified. Starting from all the steps of computation of the distance measurement, the elementary operations which have served to arrive at the final distance are recorded and identification is obtained by label changes of the sub-trees reduced to branches.

Abstract: The invention relates to a family of organic compounds of the 1(4 hydroxyphenyl)2(4' cyanophenyl) ethane ester type which have a smectic A type mesomorphic phase, to the mixture obtained from these compounds as well as the method for manufacturing the molecules of this family. The compound of the invention corresponds to the general chemical formula: ##STR1## n being between 1 and 15.

Abstract: A method for making a CMOS integrated circuit device saves on masking steps by using unmasked blanket implantations at various steps of the process, such as setting the threshold voltages of the transistors, forming a lightly doped drain for the N-channel transistor, and for forming the source/drain regions of the N-type transistor.