摘要:
Aqueous monomer solutions comprising free-radically polymerizable monomers and at least 55% by weight of water are spray polymerized to prepare crosslinked, water-swellable polymers.
摘要:
Process for preparing an aqueous polymer dispersion by polymerizing at least one ethylenically unsaturated monomer B in an aqueous medium in the presence of polymer particles A and at least one dispersant.
摘要:
Process for preparing an aqueous polymer dispersion by polymerizing at least one ethylenically unsaturated monomer B in an aqueous medium in the presence of polymer particles A and at least one dispersant.
摘要:
A method is disclosed of controlling a switched mode converter comprising a switch and for providing power to device having a load, comprising: in response to the load exceeding a first threshold, operating in a first mode, being a CCM; in response to the load exceeding a second threshold and not exceeding the first threshold, operating in second mode, being a BCM without valley skipping wherein the switching frequency increases with decreasing load; in response to the load exceeding a third threshold and not exceeding the second threshold, operating in a third mode, being a BCM with valley skipping, wherein the switching frequency depends on the load and the number of valleys skipped and is between a fixed upper and a lower switching frequency limit; and in response to the load not exceeding the third threshold, operating in a fourth mode, being a BCM with valley skipping, wherein the switching frequency depends on at least the load, and is between an upper and a lower switching frequency limit wherein the upper switching frequency limit decreases with decreasing load. A switched mode converter controlled by such a method is also disclosed.
摘要:
A power conversion controller for controlling the operation of a switch in a power conversion circuit, wherein the power conversion controller is configured to operate the switch according to: a variable frequency mode of operation for switching frequencies greater than a minimum threshold value; and a fixed frequency mode of operation at a switching frequency equal to the minimum threshold value.
摘要:
Consistent with an example embodiment, a circuit comprises a power factor correction stage having a DC input, a ground input, a DC output and a ground output. The circuit further includes a capacitor; a diode; and a discharge circuit. A first terminal of the diode is connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor; and the second plate of the capacitor is connected to the other input of the PFC stage. The discharge circuit is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value.
摘要:
Aqueous alkyl ketene dimer dispersions which comprise at least 15% by weight of an alkyl ketene dimer and at least one water-soluble cationic starch, aluminum sulfate and at least one condensate of naphthalenesulfonic acid and formaldehyde or lignin sulfonic acid or in each case salts thereof, the dispersions comprising, based in each case on alkyl ketene dimer, from 2 to 50% by weight of aluminum sulfate, and in which the dispersions additionally comprise from 0.1 to 5% by weight of a saturated carboxylic acid having 1 to 10 carbon atoms, benzenesulfonic acid, p-toluenesulfonic acid and/or a mineral acid at an aluminum sulfate content of from 2 to 15% by weight, and the use of the dispersions as engine size and surface size for paper and paper products.
摘要:
A method for reorganizing performance quantity data in a segment of a non-volatile memory. The method encompasses the tasks or operations of generating a cohesive data block at an address space of a working memory, of performance quantity data from a first segment of the non-volatile memory and/or from the working memory, and of copying the data block to a predefined address space of the first or a second segment of the non-volatile memory in a block write operation, the performance quantity data of the data block in essence being written to the predefined address space simultaneously in the block write process.
摘要:
A drainage arrangement for a tailgate of a motor vehicle body has water outflow spouts in the inner panel of the tailgate. The water outflow spouts are arranged correspondingly to water outflow openings in a rear part or a rear-end trim panel of the body behind a vehicle license plate as viewed in relation to the direction of travel.
摘要:
A drainage arrangement for a tailgate of a motor vehicle body has water outflow spouts in the inner panel of the tailgate. The water outflow spouts are arranged correspondingly to water outflow openings in a rear part or a rear-end trim panel of the body behind a vehicle licence plate as viewed in relation to the direction of travel.