Abstract: An air sampling device comprises a pump assembly including a pump and a motor operably associated with the pump, the air flow rate of the assembly being substantially characterized by a function having a plurality of measurable variables; sensors for periodically automatically monitoring the variables; a programmable computer operably associated with the sensors for periodically estimating the instantaneous air flow rate of the pump from the function and the monitored variables and for camparing the calculated instantaneous air flow rate with a previously programmed desired air flow rate; and a DC-DC converter responsive to the computer and operably associated with the motor for modulating the motor speed in response to the computer to thereby cause the instantaneous air flow rate of the pump to approach the desired air flow rate.

Abstract: A signal processing circuit operates upon digitized signals from a plurality of linear color sensors that are spatially separated in the page scanning direction by a predetermined number of lines. The digitized signals are realigned in a line rephasing circuit, which provides sets of rephased color values for each scanned element of the original. A matrix multiplication is performed in a row sequential process upon the rephased signals by a group of multipliers, one multiplier for each row coefficient of the matrix. Each multiplier receives a rephased signal and a series of coefficients multiplexed into the circuit from a group of row coefficient registers. By clocking the rephased signals at a submultiple of the coefficient rate, a row-sequential matrix operation is serially performed in a pipelined manner.

Abstract: A digital correlated double sampling circuit employs three registers and a single clock signal to sample the output of a charge transfer device. The first register samples the reset reference value on the falling edge of the master clock cycle while the remaining two registers sample on the rising edge. The second register samples the image level and the third register samples the output of the first register, thus effecting a delay of the reset reference level. The outputs of the second and third registers, that is, the image level and the reset reference level, are differenced to provide a noise-free image signal.

Abstract: A correction circuit processes digitized signals from an image sensor and generates gain correction values to compensate for variations in the output of the sensor. While imaging a gain calibration object, the sensor is operated in a calibration mode in which a plurality of calibration values are generated that pertain to each photosite. The digitized calibration values are transformed into log space for processing by a gain level averaging circuit. The log calibration signals are first subtracted from a reference corresponding to a maximum expected signal value. The difference signals are serially accumulated by means of pair of registers and an adder, and the sum is stored in a gain memory. In a subsequent normal operating mode, the summed signals for each photosite are retrieved from the gain memory and bit-shifted to form an average correction value for each photosite.

Abstract: An exercise-responsive cardiac pacemaker is provided which physiologically controls the stimulation rate of a heart by sensing the venous blood temperature in the right ventricle of the heart. A temperature sensing means which includes a thermistor produces an output signal which is sent to an algorithm implementing means for implementing the output signal by an algorithm which represents the mathematical function between venous blood temperature in the right ventricle and heart rate in a normally functioning heart. The algorithm implementing means produces an output signal which is variable between a maximum and minimum level corresponding to the desired maximum and minimum levels of heart rate in a normally functioning heart. The algorithm implementing means is also programmable by telemetry after implantation. A cardiac pacemaker is connected to the algorithm implementing means and is responsive thereto in order to variably control the stimulation rate of the heart.

Abstract: An exercise-responsive cardiac pacemaker is provided which physiologically controls the stimulation rate of a heart by sensing the venous blood temperature in the right ventricle of the heart. A temperature sensing means which includes a thermistor produces an output signal which is sent to an algorithm implementing means for implementing the output signal by an algorithm which represents the mathematical function between venous blood temperature in the right ventricle and heart rate in a normally functioning heart. The algorithm implementing means produces an output signal which is variable between a maximum and minimum level corresponding to the desired maximum and minimum levels of heart rate in a normally functioning heart. The algorithm implementing means is also programmable by telemetry after implantation. A cardiac pacemaker is connected to the algorithm implementing means and is responsive thereto in order to variably control the stimulation rate of the heart.

Abstract: A printed circuit biopotential sensing device is provided which is particularly adapted for endocardial or other deep body applications. The device has a predetermined printed circuit pattern formed on a thin film substrate, the pattern having at least one electrode pad at its distal end, at least one terminal pad at the proximal end, and conductor means selectively interconnecting the electrode pads and terminal pads. The substrate is secured to, and is preferably wrapped around an elongated member which is preferably tube-shaped in a manner such that the electrodes are exposed at the distal end of the member, and the terminal pads at the proximal end of the substrate are utilized in forming a suitable connector from the device.

Abstract: An exercise-responsive cardiac pacemaker is provided which physiologically controls the stimulation rate of a heart by sensing the venous blood temperature in the right ventricle of the heart. A temperature sensing means which includes a thermistor produces an output signal which is sent to an algorithm implementing means for implementing the output signal by an algorithm which represents the mathematical function between venous blood temperature in the right ventricle and heart rate in a normally functioning heart. The algorithm implementing means produces an output signal which is variable between a maximum and minimum level corresponding to the desired maximum and minimum levels of heart rate in a normally functioning heart. The algorithm implementing means is also programmable by telemetry after implantation. A cardiac pacemaker is connected to the algorithm implementing means and is responsive thereto in order to variably control the stimulation rate of the heart.

Abstract: Enhancement of the conventional nozzle bars in an air flotation, high speed air impingement web dryer by adding an electrode insulatedly mounted on the conductive surface of the nozzle bar which is in proximity to the web and establishing a plurality of radio frequency fringing electric fields to intercept the web and enhance the drying process is disclosed. The R.F. fields are powered by an integral R.F. generator electrically connected between the insulated electrode and the conductive nozzle bar housing. The system permits the beneficial characteristics of dielectric drying to be added to the conventional air impingement web dryer with minimum re-arrangement problems and maximum power profiling versatility. A further circuit characteristic provides for substantially constant dielectric power transfer to the web independent of variations in the nozzle bar to web spacing.

Abstract: A balloon catheter having an expandable and collapsible elastic balloon is shown, wherein the balloon is reinforced by knitted fabric such that the balloon can not expand beyond a predetermined diameter regardless of the internal pressure applied to the balloon. The knitted construction permits the balloon to expand in diameter without shortening in length, and permits the balloon to collapse smoothly without folds and wrinkles.

Abstract: An exercise-responsive cardiac pacemaker is provided which physiologically controls the stimulation rate of a heart by sensing the venous blood temperature in the right ventricle of the heart. A temperature sensing means which includes a thermistor produces an output signal which is sent to an algorithm implementing means for implementing the output signal by an algorithm which represents the mathematical function between venous blood temperature in the right ventricle and heart rate in a normally functioning heart. The algorithm implementing means produces an output signal which is variable between a maximum and minimum level corresponding to the desired maximum and minimum levels of heart rate in a normally functioning heart. The algorithm implementing means is also programmable by telemetry after implantation. A cardiac pacemaker is connected to the algorithm implementing means and is responsive thereto in order to variably control the stimulation rate of the heart.

Abstract: A machine tool safety system includes an electric field generator capacitively coupled to a receptor antenna. A self-test network includes a self-test radiating antenna and a circuit arrangement operative to apply a test signal to the self-test antenna. The test signal may be of sufficient strength to induce in the receptor antenna a first excitation signal having a magnitude greater than a first predetermined threshold to verify that the safety system is operative to detect the entry of the field generator carried on an operator's person into a hazard zone proximal to the machine tool. The test signal may be of sufficient strength to induce a second excitation signal greater than a second threshold to verify that the safety system is operative to detect the entry of the field generator into an arming zone spaced from the hazard zone.

Abstract: An exercise-responsive cardiac pacemaker is provided which physiologically controls the stimulation rate of a heart by sensing the venous blood temperature in the right ventricle of the heart. A temperature sensing means which includes a thermistor produces an output signal which is sent to an algorithm implementing means for implementing the output signal by an algorithm which represents the mathematical function between venous blood temperature in the right ventricle and heart rate in a normally functioning heart. The algorithm implementing means produces an output signal which is variable between a maximum and minimum level corresponding to the desired maximum and minimum levels of heart rate in a normally functioning heart. The algorithm implementing means is also programmable by telemetry after implantation. A cardiac pacemaker is connected to the algorithm implementing means and is responsive thereto in order to variably control the stimulation rate of the heart.

Abstract: A manually powered multi-speed winch has an automatic drive disengagement upon drive reversal which is provided by an axially movable member in one drive train which in a first axial position is engageable for drive transmission through a pawl and ratchet unidirectional drive means. The drive means in its drive-transmitting condition prevents movement of the member away from that first position. Upon drive reversal the unidirectional drive means is ineffective either to transmit drive or to maintain the member in its first position and it moves axially to a second position in which the drive means are disengaged. The member is biased towards that second axial position but is manually movable to the first by a control button accessible at the outside of the winch. The button may be lockable to override the automatic disengagement.

Abstract: The sea sled includes a pair of pontoons mounting depending rollers for straddling a pipeline disposed on the sea bottom. Water jets fluidize the sea bottom to form a trench in which the pipeline settles. The slurry formed by the water jets is removed from the trench by the eductor system which includes a pair of conduits each having a suction inlet at its lower end for location within the trench, a discharge at its upper end, a pair of pump nozzles each having an inlet external to the associated conduit and an outlet within the conduit directed toward the corresponding discharge, and a pair of primary nozzles, the outlet ends of which respectively project into the inlet ends of the pump nozzles. A high pressure, low volume, fluid is pumped from the surface through the jet nozzles. Ambient fluid is entrained with the high pressure, low volume fluid emanating from the jet nozzles in the respective pump nozzles to deliver low pressure, high volume fluid to their corresponding discharges.

Abstract: A comparator circuit for comparing two voltage levels in a C-2C A/D and D/A converter, comprising four cross-coupled active devices (FETs) in a latch arrangement whereby an offset voltage is used to compensate for imbalances in the comparator. The comparator includes a first FET having its gate electrode connected to the output of the D/A converter, and a second FET having its gate electrode connected to an analog input voltage. The first and second FETs each have one of their electrodes connected to a common voltage source. A third and a fourth FET have one of their electrodes connected respectively to the other electrode of the first and second FETs at first and second common nodes, respectively. The output of the comparator is provided at one of such first and second common nodes. The first and second nodes are also respectively connected to the gate electrodes of the fourth and third FETs in a cross-coupled arrangement.

Abstract: A C-2C analog-to digital and digital-to-analog converter is described, the C-2C designation referring to the arrangement of capacitance in a capacitor ladder network. The capacitors are formed in a monolithic, multilayer structure which includes a substrate, diffusion regions in the substrate, a polysilicon layer and an aluminum layer wherein the capacitances are formed between the aluminum layer and the polysilicon layer and between the polysilicon layer and the diffusion region, and these capacitances have the ratio of 2C to C respectively. The capacitor ladder network formed in the multilayer structure can be trimmed or adjusted electrically after manufacture to obtain the desired tolerances.

Abstract: A manually powered multi-speed winch has an automatic drive disengagement upon drive reversal which is provided by an axially movable member in one drive train which in a first axial position is engageable for drive transmission through a pawl and ratchet unidirectional drive means. The drive means in its drive-transmitting condition prevents movement of the member away from that first position. Upon drive reversal the unidirectional drive means is ineffective either to transmit drive or to maintain the member in its first position and it moves axially to a second position in which the drive means are disengaged. The member is biased towards that second axial position but is manually movable to the first by a control button accessible at the outside of the winch. The button may be lockable to override the automatic disengagement.