摘要:
A method for controlling well bore pressure based on model prediction control theory and systems theory, includes: detecting a well bottom pressure, a stand pipe pressure, a casing pressure, an injection flow rate and an outlet flow rate during the drilling operation process and determining the presence of overflow or leakage; if there is no overflow or leakage, then fine-adjusting the wellhead casing pressure according to the slight fluctuations of the well bottom pressure, the stand pipe pressure or the casing pressure; if there is overflow or leakage, simulating and calculating the overflow or leakage position and starting time of the overflow or leakage, predicting the variation over a future time period of the well bore pressure in the well drilling process, and utilizing an optimization algorithm to calculate the control parameter under a minimum of an actual well bottom pressure difference during the future period.
摘要:
A diluter for diluting a sample flow of a test gas to allow subsequent measurement of emissions in the test gas. During a calibration mode, a first flow control element receives and controls the dilution flow, a second flow control element receives and measures only the dilution flow, and a third flow control element is closed. Also during calibration, the second flow control element is calibrated to the first flow control element. During a measurement mode, the same dilution flow rate is maintained in the first and second flow control elements, the sample flow and dilution flow are mixed, and the mixed flow flows into both the second flow control element and the third flow control element. Also during measurement, the third flow control element controls sample flow, and the second flow control element delivers a portion of the mixed flow to the instrument.
摘要:
A fixing unit includes a fixing plate and a bolting member. The fixing plate including a front surface and a rear surface has a holding portion and a locking structure. The bolting member is movably assembled on the fixing plate. The bolting member includes a main segment, an extension segment and a protruding segment sequentially defined thereon. The main segment and the extension segment have a first flanged structure therebetween. The extension segment inserts into the holding portion of the fixing plate. When the bolting member is secured to the fixing plate, the protruding segment of the bolting member exposes form the front surface.
摘要:
A remote control, an imaging device, a method and a system for the same are provided to realize the functions such as channel selection of programs, character input, etc. The remote control comprises: an operation means having multiple keys, an ultrasonic and radio signal transmitting means for transmitting radio signals and ultrasonic signals while one of the said multiple keys is operated to map the position of the remote control into a cursor displayer on a screen, and a control means for controlling the said operation means and the said ultrasonic and radio signal transmitting means.
摘要:
The invention provides a preparation method of super-macroporous polymeric microspheres and a product thereof. The method is characterized in that adding high content of surfactant into an oil phase containing a monomer and dispersing the oil phase containing the monomer and the surfactant into an aqueous phase. Super-macroporous microspheres are obtained by means of suspension polymerization. In the interior of the microspheres, 10-60% of the pores are distributed in a range of 500-900 nm. The microspheres have a particle diameter of 1-200 μm and a porosity of 30%-90%. The product is suitable for being used as a stationary phase matrix in liquid chromatography, a carrier for high performance catalysts and a high performance adsorbent, and especially, being used as a separation medium for separating biomacromolecules.
摘要:
A solid particle counting system for measuring solid particle number concentrations from engine or vehicle exhausts in real-time includes a flow splitter having an inlet, a sample outlet, and a by-pass outlet arranged such that a main flow enters the inlet and changes direction to exit the by-pass outlet. A sample flow from the main flow exits the sample outlet. The flow splitter further includes a guiding element arranged such that particles at a sampling location upstream of the main flow direction change are guided to the sample outlet.
摘要:
Disclosed is a hybrid ranging method comprising the steps of: transmitting from a first node an ultrasonic signal and a radio signal comprising at least one radio synchronization signal with a predetermined ratio; calculating, at a second node, a ultrasonic transmission time period between the receipt of the radio synchronization signal and the receipt of the ultrasonic signal; calculating, at the second node, an ultrasonic measured result between the first node and the second node by using the ultrasonic transmission time period; calculating, at the second node, the strength of the received radio signal, and obtaining a radio measured result between the first node and the second node from a reference database; calculating, at the second node, the smoothness of the ultrasonic measured result and the radio measured result; and determining at the second node, a final measured result according to the smoothness of the ultrasonic measured result and the radio measured result.
摘要:
A solid particle counting system for measuring solid particle number concentrations from engine or vehicle exhausts in real-time includes an evaporation unit, a diluter arrangement, and a particle counter. The diluter arrangement mixes the dilution gas with the gases from the evaporation unit at a dilution ratio, and the diluter arrangement includes a flow meter located upstream of the evaporation unit for measuring the flow of gases into the evaporation unit which, in turn, flow into the diluter arrangement.
摘要:
A partial flow sampling system includes a system inlet for receiving an exhaust sample flow from a sample inlet probe and transfer line. The system further includes a dilution air control system for controlling a dilution air flow rate, and a mixer. The mixer receives and mixes the exhaust sample flow and the dilution air flow to produce a mixture flow. A total flow control system controls the mixture flow rate. An orifice flow meter installed at the system inlet measures the exhaust sample flow rate in. real-time. This provides accurate sample flow measurements over a wide range of dilution ratios and sample ratios.
摘要:
The invention provides a preparation method of super-macroporous polymeric microspheres and a product thereof. The method is characterized in that adding high content of surfactant into an oil phase containing a monomer and dispersing the oil phase containing the monomer and the surfactant into an aqueous phase. Super-macroporous microspheres are obtained by means of suspension polymerization. In the interior of the microspheres, 10-60% of the pores are distributed in a range of 500-900 nm. The microspheres have a particle diameter of 1-200 μm and a porosity of 30%-90%. The product is suitable for being used as a stationary phase matrix in liquid chromatography, a carrier for high performance catalysts and a high performance adsorbent, and especially, being used as a separation medium for separating biomacromolecules.