Abstract: The invention relates to a switching arrangement for operating at least one LED, which switching arrangement is provided with: input terminals (1, 2) for connecting a supply source; output terminals (3, 4) for connecting the LED to be operated; a first series circuit (I) between one of the input terminals (1) and one of the output terminals (3), including at least a self-inductance (L), a capacitor (C) and a diode (D); a second series circuit (II) between the input terminals, including at least the self-inductance (L) and a switiching element (S) which is alternately switched to a conducting state and a non-conducting state at a high frequency; a third series circuit (III) between the output terminals, including the diode and an inductive winding (SW). According to the invention, the inductive winding forms a secondary winding of a transformer (T), which has a primary winding (PW) which forms part of both the first and the second series circuit.

Abstract: In a lighting arrangement comprising a LED array and a DC-DC-converter for supplying the LED array, the DC-DC-converter is an up-converter and the LED array is coupled between an input terminal and an output terminal. The up-converter generates a very low voltage over the LED array without making use of a transformer.

Abstract: In a circuit arrangement for driving a LED array comprising red, green and blue LEDs, a control loop is added for limiting the duty cycles of the control signals for driving the red, green and blue LEDs. In case one of the duty cycles reaches the limit value, the reference signals for the red, green and blue light are decreased with the same relative amount. The color point of the light is thereby maintained, even when the efficiency of part of the LEDs decreases.

Abstract: A method of authenticating data transmitted in a digital transmission system, in which the method comprises the steps, prior to transmission, of determining at least two encrypted values for at least some of the data, each encrypted value being determined using a key of a respective encryption algorithm, and outputting said at least two encrypted values with said data.

Abstract: In an up-converter feed forward control of the output current is effected by rendering the conduction time of the switching element proportional to Vout/Vin2. This control is fast and avoids interference and loss of efficiency.

Abstract: A combined computer and decoder system for receiving broadcast digital data transmissions, characterized in that the decoder (2020) comprises a routing means (2032), broadcast digital data received at the decoder (2020) and destined for the computer (2027) being identified and routed to applications within the computer by said routing means. The computer (2027) may further include control means (2038) for controlling the configuration of the decoder, such as the selected channel frequency of the decoder.

Abstract: This process for enriching nickel-bearing oxide ore comprises pulping the ore, washing the pulped ore for at least 1 minute, sorting the washed ore in a damp environment so as to separate at least one fine fraction from a granular fraction, subjecting the fine fraction to densimetric separation at a dividing density of between 1.7 and 2.5 and recovering the light fraction separated off as enriched ore.

Abstract: Unique titanium dioxide (TiO.sub.2) particulates have an especially high physicochemical affinity for cellulosic fibers and, thus, are well suited as opacifying pigments for paper and paper laminates, and include a zeta potential-adjusting amount of at least one cationic polymer, e.g., a polymer of a quaternary ammonium, sulfonium or phosphonium salt or a copolymer of acrylamide with a cationic comonomer, fixed to the face surfaces thereof.

Abstract: Method and apparatus for analyzing particles based on different depolarizing structure associated with the different particle types. Cells in a flow cytometer are illuminated with a linearly polarized light, producing scattered depolarized light whose intensity range, at a selected measuring angle, and in a suitable discriminating space, is used to analyze different particle types.

Abstract: An asynchronous time division multiplex switching network for switching multi-service communication data performs point-to-point data switching, data switching between a single calling party and a plurality of called parties, and data switching between plural calling parties and a single called party. The network comprises plural incoming and outgoing time division multiplex highways including asynchronous channels each formed by a packet data and an address label (j, k). Incoming and outgoing terminal switching equipments are respectively connected to the incoming and outgoing highways. A bus interconnects the terminal switching equipments. The labels are converted into several sub-words according to the type of communication switching. In response to the values of these sub-words, the outgoing terminal switching equipments accept or do not accept the packets to be transmitted.

Abstract: Compositions are provided which consist of a solid suspension of:a. a prepolymer obtained by reacting a N,N'-bis-imide of an unsaturated dicarboxylic acid of general formula: ##STR1## in which D represents a divalent organic radical containing a carbon-carbon double bond and A represents a divalent organic radical possessing from 2 to 30 carbon atoms, and a polyamine of general formula:R (NH.sub.2).sub.xin which x represents an integer at least equal to 2 and R represents an organic radial of valency x, the bis-imide being used in an amount from 0.55 to 25 mols per mol of --NH.sub.2 group introduced by the polyamine, suspended in:B. water, and optionally,C. a polar water-miscible organic solvent having a boiling point between 110.degree. C and 270.degree. C in an amount up to 50% by weight of the liquid phase. These compositions are thixotropic and useful for coating and impregnating fibrous materials and the like from which valuable resinous composites can be obtained.