摘要:
Disclosed are a device and a method for continuously monitoring and regulating a process solution or the concentration of additives in a process solution, which influence the surface tension, particularly surfactants, in permanently operating industrial cleaning, coating, and rinsing installations, based on measuring the surface tension according to the bubble pressure method. Units detecting the surface tension or the concentration of a process additive in a process solution, processing and controlling a predefined internal program flow of the device, continuously monitoring the quality of a process solution, and triggering an external unit influencing the process are coordinated by means of an intelligent computer system which independently extracts and processes process data, uses the data for modifying the program flow thereof, exchanges the data with an external process control system, and influences the process.
摘要:
The present invention relates to a method for investigating the behavior of particles or droplets in a gas-vapor mixture inside a flow device, which is useful for studying cloud dynamical and microphysical processes. The invention allows adjustment and/or control of the thermodynamic system parameters based on the observed behavior of an internal standard with known properties, thus achieving a well-defined vapor concentration and saturation field inside the flow device. By injecting particles or droplets to be investigated into this well defined flow device, and measuring the size of the particles or droplets, the activation and growth or shrinking behavior of the particles or droplets may be determined using a mathematical model of the fluid, thermodynamic, and chemical conditions of the flow device.
摘要:
Ultrasonic spectroscopy, calorimetry, or thermogravimetric analysis provide measures which correlate with properties of asphaltene complex of petroleum residua which can be used to establish or maintain consistent properties of petroleum residua during blending or to determine immediacy of petroleum residuea to deposition phenomena during pyrolytic thermal treatment.
摘要:
A method and apparatus therefor for depositing a flattened droplet on a partially absorbent surface comprising the steps of providing a narrow bore transfer tube having a proximal end and a distal end and containing a microvolume of liquid, the proximal end connected to a pneumatic system adapted for issuing an outgoing flow of displacement gas into the tube and drawing an incoming flow of displacement gas therefrom; and issuing an outgoing flow of displacement gas for slowly discharging substantially the entire microvolume of liquid as a droplet on the surface and controllably blowing one or more bubbles into the droplet towards the end of its discharge for flattening the droplet on the surface. A pump (31) comprising a housing (33) having a bore (34) with an internal peripheral surface (36), and a stationary annular sealing member (48) integrally formed therewith at a first end (37) of a pair of opposite ends (37 and 38); a slide rod (39) disposed in the bore and having an external peripheral surface (41) and a displaceable annular sealing member (49) integrally formed therewith; the sealing members sealing the peripheral surfaces to define a vented displacement volume (51) therebetween whose volume is proportional to an annular cross section area between the peripheral surfaces and a distance between the sealing members; and the slide rod being slidably reciprocable between first and second positions respectively toward and away from the stationary sealing member whereupon the displaceable sealing member moves to reduce the volume to issue an outgoing flow of displacement gas from the displacement volume on a downstroke of the slide rod from its second position to its first position and the displaceable sealing member moves to increase the volume to draw an incoming flow of displacement gas into the displacement volume on an upstroke of the slide rod from its first position to its position.
摘要:
A method of and apparatus for flow injection analysis using a reaction chamber having a continuously variable volume, where the volume of the reaction chamber may be varied before, during or after introduction of an analyte solution and reagent solution into the reaction chamber. A microprocessor may be incorporated to control the volume of the reaction chamber and other components, either in a preprogrammed manner or in response to particular data measured by a detection device.
摘要:
The time profile of the output signal of an NOx measurement transducer arranged downstream of the NOx storage catalyst is used, during and after the regeneration phase, to derive a criterion as to whether the quantity of regeneration agent to be supplied to the NOx storage catalyst in a regeneration phase must be changed in order to achieve an optimum action of the exhaust-gas purification system. The output signal is picked off at the amperometric NOx measurement transducer at two electrodes. The measurement transducer exhibits the two-position behavior necessary for the method.
摘要:
In order to ensure optimum metering of a reagent to be metered into an exhaust gas during operation of a metering unit of a catalytic converter of a combustion system, in particular an internal combustion engine of a motor vehicle, in any operating state of the catalytic converter and/or in any operating state of the combustion system, a method and a device for operating a metering unit of a catalytic converter of a combustion system provide that, based on a steady-state value of the reagent quantity to be metered during a steady-state operating state of the catalytic converter and/or the combustion system, the quantity of the at least one reagent is determined and adjusted using at least one dynamic correction factor which is dependent on at least one of the performance characteristics of the catalytic converter and on at least one of the performance characteristics of the combustion system. The dynamic correction factor and/or a nitrogen oxide correction factor are obtained from a dynamic correction characteristics map or a nitrogen oxide correction characteristics map only as a function of performance characteristics of the internal combustion engine, in particular the engine speed and the injected fuel quantity, and of performance characteristics of the catalytic converter, preferably the nitrogen oxide emission and the temperature of the exhaust gas downstream from the catalytic converter.
摘要:
A microvascular network device comprising: a substrate; at least one microchannel; at least one opening to the microchannel for sample entry; at least one opening to the microchannel for sample exit; and an aspirator which causes the sample to traverse the microchannel.
摘要:
A method for blending at least two hydrocarbon liquids, the method comprising: (a) determining the critical solvent power for each hydrocarbon liquid by (i) mixing each hydrocarbon liquid with predetermined amounts of a paraffin; (ii) centrifuging each resulting mixture; (iii) recovering and weighing any resulting precipitated insolubles from step (ii); and (iv) correlating the weight of the insolubles in step (iii) to the solvent power at which asphaltenes begin to precipitate out of the hydrocarbon; (b) determining the solvent power for each hydrocarbon liquid by: (i) determining the distillation curve and density of each hydrocarbon liquid; (ii) numerically integrating the distillation curve of each hydrocarbon liquid, producing the volume average boiling point for each hydrocarbon liquid; (iii) calculating the characterization K factor for each hydrocarbon liquid using the volume average boiling point in step (ii); and (iv) determining the solvent power of each hydrocarbon liquid using the characterization K factor in step (iii), wherein heptane and toluene are used as solvent power references wherein heptane has a solvent power of zero and toluene has a solvent power of 100; and (c) blending the each crude oil into each other producing a crude oil blend wherein the solvent power of the crude oil blend is greater than the critical solvent power of the crude oil having the highest critical solvent power in the blend.