摘要:
A soldering station with a control unit and a soldering iron having a replaceable soldering tip, the soldering iron being connected to the control unit by a power cord for receiving electrical power from said control unit is provided with an automatic calibration feature. The control unit has circuitry for controlling the temperature of the soldering iron at the tip by adjusting the supply of power to the tip heater of the soldering iron, a temperature selector for enabling selection of a temperature to which the soldering iron is to be heated by a user, a calibration temperature sensor connected to said circuitry and exposed for enabling it to be engaged by the tip of the soldering iron. The circuitry has a calibration mode and a heating mode, and in said calibration mode, the circuitry is compares a temperature sensed by the calibration temperature sensor and produced by contacting of the soldering iron which has been heated to a temperature selected with said temperature selector with the calibration temperature sensor, and adjusts the power supply to the tip heater so as to bring the temperature sensed by the calibration temperature sensor into conformance with the temperature selected with the temperature selector.
摘要:
The apparatus disclosed is a type of downhole pressure gauge to be used to measure and record pressure information about oil and gas wells. The apparatus measures fluctuations in pressure by means of a mechanical pressure sensitive device, such as a Bourdon tube, and records and stores this information by converting mechanical movement, associated with pressure changes as detected by the mechanical pressure sensitive device, into corresponding voltage changes across a potentiometer which are stored in an electronic memory board. The change in voltage over time corresponds to the change in well pressure over time, thereby providing important information to the well operator. Also disclosed is a method for measuring well pressure by means of combining a mechanical pressure sensitive device with an electrical system and an electronic memory board for storing the measurements. Also disclosed is a kit, whereby an existing downhole mechanical pressure gauge can be converted to a mechanical/electrical combination by the replacement of certain parts.
摘要:
L-654,040 of the structure: ##STR1## is a novel antibacterial and isolated from the novel organism Streptoverticillium synroense, strain MA6011, deposited at the ATCC.
摘要:
This case relates to a novel process which aids in the isolation and purification of novel compounds which are produced by the microorganism, Streptomyces avermitilis. The process described utilizes a column containing a hydroxyalkylated dextran gel as a step in the separation of the desired compounds. The compounds which are isolated and purified are described generically as C-076 and have significant parasiticidal activity.
摘要:
Novel compounds are produced by the fermentation of a nutrient medium with the previously undescribed microorganism Streptomyces avermitilis. They may be isolated by solvent extraction and chromatographic fractionation techniques. The compounds, which are described generically as C-076 have significant parasiticidal activity. The compounds may be included in compositions for the oral or parenteral administration to animals for the prevention and cure of parasitic infections.
摘要:
This case relates to a novel process which aids in the isolation and purification of novel compounds which are produced by the microorganism, Streptomyces avermitilis. The process described utilizes a non-aqueous extraction system for purifying crude extracts of the novel compounds. The compounds which are isolated and purified are described generically as C-076 and have significant parasiticidal activity.
摘要:
A beamforming system and method. The inventive beamforming system is adapted for use with an array antenna having a plurality of antenna elements and includes a Fast Fourier Transform (EFT) for transforming a signal received by an antenna into a plurality of frequency subbands. A plurality of adaptive processors are included for performing adaptive array processing on each of the subbands and providing a plurality of adaptively processed subbands in response thereto. A normalizing processor is also included for normalizing the adaptively processed subbands. In the illustrative embodiment, the signal is a Global Positioning System (GPS) signal and a digital multiplier for applying a weight to a respective frequency subband for each of the elements of the array. The weights are chosen to steer a beam in a direction of a desired signal. Normalization involves adjusting the amplitude of one or more of the subbands to remove any bias distortion due to the adaptive processing thereof.
摘要:
In accordance with one aspect of the present invention, a preprocessor is provided for use in an adaptive antenna array. The purpose of the preprocessor is to modify the incoming signals received by each antenna of an antenna array in such a manner as to reduce the amount of computation necessary to compute the adaptive array weights. In an adaptive array, the weight computation process generally requires calculations using digital electronics, which tend to be computationally intensive when applied to wideband, high sample rate signals. The preprocessor of the present invention solves this problem by filtering the data in such a manner as to reduce the sample rate of the signal without losing the essential characteristics of the signal. The preprocessor includes an input terminal for receiving an electromagnetic signal from an antenna element of the adaptive antenna array, and a frequency smearer operatively coupled to the input terminal. The frequency smearer is provided in order to smear the electromagnetic signal by varying the frequency of the electromagnetic signal across a predetermined frequency band and outputting the smeared electromagnetic signal to an averaging circuit. The averaging circuit, which is operatively coupled to the output of the frequency smearer, repetitively computes and outputs an average with respect to time of the smeared electromagnetic signal.