Abstract: The invention relates to a method of using an indirect heat exchanger comprising a plurality of heat exchange modules arranged in a rectangular grid. Each heat exchange module comprises a plurality of first and second fluid flow channels extending in a first and second direction. The indirect heat exchanger comprises first and second manifolds fluidly connecting the first and second fluid flow channels of one heat exchange module with the first and second fluid flow channels of adjacent heat exchange modules thereby forming one or more first fluid paths. The invention also relates to a facility for processing liquefied natural gas including at least one indirect heat exchanger as described above.

Abstract: A wheelchair sit-system with a three dimensional anatomical shape, which can accomplish an equal as well as an unequal pressure/load distribution, stabilize the pelvic base and trunk, compensate sit pathology, and be individually adapted on the basis of treatment of specific sit complaints/impairments. The wheelchair sit system (i.e., a sit cushion and a backrest) is developed methodically via inventory of the three dimensional pelvis/trunk measures; design a three dimensional drawing of basic sit cushions and backrest models in three sizes (S, M and L); specification of the sit pathology of the pelvis and trunk; and modification of the designed three dimensional basic sit cushion and backrest models on the basis of sit pathology. A product development trajectory results in nine sit cushion models in three sizes (S, M and L); six backrest models in three sizes (S, M and L); one generic sit cushion, with inserts, in three sizes (S, M and L); and one generic backrest, with inserts, in three sizes (S, M and L).

Abstract: A wheelchair sit-system with a three dimensional anatomical shape, which can accomplish an equal as well as an unequal pressure/load distribution, stabilize the pelvic base and trunk, compensate sit pathology, and be individually adapted on the basis of treatment of specific sit complaints/impairments. The wheelchair sit system (i.e., a sit cushion and a backrest) is developed methodically via inventory of the three dimensional pelvis/trunk measures; design a three dimensional drawing of basic sit cushions and backrest models in three sizes (S, M and L); specification of the sit pathology of the pelvis and trunk; and modification of the designed three dimensional basic sit cushion and backrest models on the basis of sit pathology. A product development trajectory results in nine sit cushion models in three sizes (S, M and L); six backrest models in three sizes (S, M and L); one generic sit cushion, with inserts, in three sizes (S, M and L); and one generic backrest, with inserts, in three sizes (S, M and L).

Abstract: A measuring circuit arrangement (1) for an electricity meter for direct connection is respectively connected, to an input (3) for voltage measurement and an input (4) for current measurement of a measuring chip (2) for each phase of a three phase supply. Upstream of the input (3) for voltage measurement is a voltage divider (R1,R2) provided in order to match the voltage level, and upstream of the input (4) for current measurement is a voltage transformer (5) with measuring shunt (RSH) installed according to the invention. The voltage transformer (5) is so arranged that its ohmic resistance towards the measuring shunt (RSH) on the one hand sufficiently limits standard direct-current impingement of the voltage transformer (5) and on the other hand this ohmic resistance is also small enough so that, together with the inductance of the current transformer (5), it displays no more than standard angle error.

Abstract: The invention relates to a compensation circuit for the phase shift between a first input (3) for a voltage determination and a second input (4) for a current determination in electric meters for direct connection, whereby a DC-tolerant converter (5), for current transformation, is arranged before said second input (4) and a high pass filter (R1, C) is arranged before the first input (3), for a first equalisation of the non-frequency-dependant phase compensation. A further equalisation of the phase compensation occurs by means of a correction device (5) in a measuring chip (2), which is connected in series with the inputs (3, 4) for voltage determination and current determination.

Abstract: A measuring circuit arrangement (1) for an electricity meter for direct connection is respectively connected, for each phase of a three-phase network, to an input (3) for voltage detection and to an input (4) of a measuring chip (2) for detection of the electric current. A voltage divider (R1,R2) used for voltage level adaptation is provided upstream from the input (3) for voltage detection. A current transformer (5) with a series connected measuring shunt (R?SH#191) is installed upstream from the input (4) for current detection. The current transformer (5) is embodied in such a way that the ohmic resistance to the measuring shunt (R?SH#191) sufficiently limits standard direct-current impingement of the current transformer (5) and said ohmic resistance is small enough so that, together with the inductance of the current transformer (5), it only exhibits a standard angle error.

Abstract: The invention relates to a compensation circuit for the phase shift between a first input (3) for a voltage determination and a second input (4) for a current determination in electric meters for direct connection, whereby a DC-tolerant converter (5), for current transformation, is arranged before said second input (4) and a high pass filter (R1, C) is arranged before the first input (3), for a first equalisation of the non-frequency-dependant phase compensation. A further equalisation of the phase compensation occurs by means of a correction device (5) in a measuring chip (2), which is connected in series with the inputs (3, 4) for voltage determination and current determination.

Abstract: In order to obtain a simple construction of an electricity meter (1), the invention provides that the meter comprises a highly integrated input module (3a, 3b, 3c) in which an analog-digital converter (5a, 5b) and an output module (7a) are integrated. A multiplying means (21) can optionally be integrated. Such an input module (3a, 3b, 3c), in combination with conventional components, especially microprocessors, makes it possible to produce an electricity meter which comprises a simple construction and which is of a single-phase and multi-phase type (also for a plurality of consumers).

Abstract: A system for measuring the energy output from one or more electrical energy sources first makes an analog power measurement, and converts the resultant output into digital form. The A/D converter includes a sigma-delta modulator in series with a digital filter. Then, the output from the A/D converter is inputted to a digital quantizer via a serial interface. A programmable calibration value is also inputted into the digital quantizer from a computer via a non-volatile memory, such that the operating level/calibration of the digital quantizer is controllable by the computer.

Abstract: Ship's propeller having a propeller blade having a leading edge and a trailing edge and a free end, and end plates at the free end extending transversely of the blade on both sides of the blade. The line of attachment to the blade of each of the end plates has a chord length less than the chord length of the blade end and the lines of attachment of the end plates overlap each other partly, one end plate extending to the blade leading edge and the other end plate extending to the blade trailing edge. The end plates have airfoil configuration and have leading edges that extend outwardly and rearwardly of the blade with respect to the direction of movement of the blade.

Abstract: An arrangement for electrical measurement ascertains "subordinate" quantities, and is also "main" quantities with great accuracy and safety against falsification. An active energy to be measured is a main quantity, and a subordinate quantity is at least one of the following quantities: effective value of the voltage (u.sub.N) or of the current (i.sub.N), volt hours, volt square hours, ampere hours, ampere square hours, active power, reactive power, reactive energy, apparent output, apparent energy or power factor. The arrangement may comprise a voltage sensor (8), a voltage/current-converter (9), a multiplier (10), a current/voltage-converter (11), two analog/digital-converts (12 and 15), a signal/frequency-converter (13), a counter (14), an interface circuit (4), and an indicator (7), wherein the current/voltage-converter (11) consists of a constant current source (16) and a further multiplier (17).

Abstract: An arrangement which eliminates or reduces the negative influence of small variations in the charge-carrier concentration of a semiconductor material upon the longterm stability of a magnetic field sensor such as a Hall element is disclosed. In an illustrative embodiment, the arrangement comprises a magnetic field sensor, a voltage/current converter which provides a supply current to the magnetic field sensor, an amplifier connected sequentially downstream of the voltage/frequency converter, and an analog/digital or voltage/frequency converter connected sequentially downstream of the amplifier. The amplifier provides a transmission ratio which is proportional to (1+.delta.n/n) or (1-.delta.n/n) where n is the carge-carrier concentration of the semiconductor material in which the magnetic field sensor is formed and .delta.n is a variation in time of the charge-carrier concentration n.

Abstract: The present invention relates to a current divider for a measuring transducer. The current divider includes two conductors. The first conductor, which is operable as a shunt, comprises two generally flat legs which extend parallel to one another. Each leg defines one aperture into which the core of the measuring transducer extends. The second conductor is z-shaped having two arms and a bridge extending between the two arms. The arms are electrically connected to one of the legs and the bridge crosses the aperture therein, so that the bridge is surrounded by the core.

Abstract: An apparatus for heating a sheet- or web-like material during its transport through a processing machine, comprises at least one infrared heating panel facing the path of transport of the material. The apparatus is provided with a controlling circuit for controlling the heat emission of the heating panel in response to a control signal generated by a control means. The heating panel is switched off if the transport speed of the material becomes smaller than a minimum speed by means of a monitoring circuit which can switch off the controlling circuit, said monitoring circuit being coupled to a detector means reacting to the transport speed. The monitoring circuit may further comprise at least one zone detector means reacting to the presence of the material within a given zone extending transversely to the transport direction of the material on either side of the desired path of transport, wherein the monitoring circuit switches off the controlling circuit if the material leaves the zone.

Abstract: In an electronic energy consumption meter using a mark-space amplitude multiplier, including a current-frequency transducer, a first supervisory circuit is coupled to, and supervises the mark-space modulator multiplier, a second supervisory circuit is coupled to, and supervises the current-frequency transducer, and a fault indicator is coupled to the output of each of the supervisory circuits for indicating a fault in the meter.

Abstract: An apparatus for heating a sheet- or web-like material during its passage through a processing machine. The apparatus is provided with at least one heating panel which faces the path of travel of the material and is equipped with a number of infrared-radiation producing elements energized from an ac-source. The apparatus comprises a controlling unit for determining the heat released by the heating panel as a function of a control signal generated by a control means. The infrared elements generate short- to medium-wave infrared radiation. The control signal generated by the control means may be a function of the temperature of the material being passed along the heating panel, or a function of the rate of passage of said material.

Abstract: A variable pulse width generator generates a periodically recurring and variable mark-to-space ratio waveform, so that the ratio of the difference between the space and mark durations to the sum of the space and mark durations is proportional to a selectable voltage, and substantially independent of any resistor values used in the circuit.