摘要:
The invention relates to a method for dewatering particle collections with the aid of a filter press in a cyclic sequence comprising filling, dewatering and emptying stages. The various stages within each cycle and between consecutive cycles are followed-up and determined by measuring continuously a magnitude which varies with the mass of the press and its contents, preferably the pressure exerted by the press and its contents on the surface supporting the press.
摘要:
An output-impedance in a power amplifier is provided. A first transistor QBUF of a buffer stage is connected to a first side of a resistor RF and a second transistor QAMP to a second opposite side of the resistor RF. The first transistor feeds a current IRF to the second resistor QAMP. The current IRF at the second transistor is copied and multiplied by a factor (n) to form an output current IOUT, as (1+n)* IRF. The current IRF is fed back to the first transistor and the output current IOUT is fed to a load resistor R.
摘要:
A retrofit diverter switch which has a mechanical and electrical interface that is compatible with the existing designs is provided. The diverter switch may include a vacuum switch. The feature where the mechanical and electrical interface is compatible enables a retrofit from traditional On Load Tap Changers to a vacuum based on Load Tap Changers. The diverter switch may be retrofitted into existing tap changer housings. Retrofitting from traditional to vacuum based, traditional to vacuum based and up rating, and vacuum up rating may be possible. Also, the diverter switch may include modular components that allow for easy customization of the diverter switch for different applications.
摘要:
The present invention is a method of producing a chromatographic separation matrix, wherein porous polymeric particles comprised of two layers with different properties are prepared in a two-phase system by (a) providing porous polymeric particles with reactive groups on their surfaces; (b) washing said particles with a first solvent and draining the particles to enclose a first phase; (c) wetting the outer layer of the particles by adding a second solvent, which is essentially insoluble in the first solvent; (d) reacting the reactive groups in the outer layer by adding a reagent, which is essentially non-reactive in the first solvent; and (e) coupling of chromatographic binding groups to the reactive groups in the inner layer. The invention also encompasses a porous polymer particle suitable for use as a chromatographic separation matrix and a process of separation, wherein a matrix according to the invention is used.
摘要:
The present invention is a method of producing porous beads, which comprises the steps of providing a first liquid phase comprising a bead matrix material and essentially edgy templating particle(s), said particle(s) being treated with a surface modifying agent; providing a second liquid phase which is immiscible with the first liquid phase; contacting the first phase and the second phase under conditions resulting in an emulsion of droplets comprised of the first liquid phase dispersed in the continuous second liquid phase; transforming the droplets to mesoporous beads by solidification of the liquid; and removing the templating particle(s) from the beads without causing any essential change of the surrounding bead, whereby hierarchical networks of pores are provided in the beads.
摘要:
A method for the manufacture of a solid porous separation material based on a polysaccharide, said method comprising the steps of: (a) providing an aqueous solution (I) of a polysaccharide, (b) solidifying the solution, preferably by transforming the solution to a gel, and (c) optionally crosslinking the polysaccharide, with the proviso that, if step (c) is present, steps (b) and (c) may be carried out simultaneously. The method is characterized in that the polysaccharide provided in step (a) is modified by being inter-molecularly crosslinked to an extent such that the viscosity of the solution (I) is at least 110%, preferably at least 200%, of the viscosity of an aqueous solution (II) of the corresponding polysaccharide which has not been intermolecularly crosslinked and which is present in the same concentration as the inter-molecularly crosslinked polysaccharide is in solution (I)
摘要:
The present invention is a method of producing a chromatographic separation matrix, wherein porous polymeric particles comprised of two layers with different properties are prepared in a two-phase system by (a) providing porous polymeric particles with reactive groups on their surfaces; (b) washing said particles with a first solvent and draining the particles to enclose a first phase; (c) wetting the outer layer of the particles by adding a second solvent, which is essentially insoluble in the first solvent; (d) reacting the reactive groups in the outer layer by adding a reagent, which is essentially non-reactive in the first solvent; and (e) coupling of chromatographic binding groups to the reactive groups in the inner layer. The invention also encompasses a porous polymer particle suitable for use as a chromatographic separation matrix and a process of separation, wherein a matrix according to the invention is used.
摘要:
The present invention relates to a method for producing porous polysaccharide beads, comprising: (a) mixing a water-based solution of a polysaccharide under stirring with an essentially water-immiscible first organic phase to form an emulsion which separates into two continuous phases; (b) adding a second organic phase comprising an emulsifier and an organic solvent to form a three-phase system; (c) allowing the three-phase system to emulsify; and (d) decreasing the temperature below the gelling point of the polysaccharide, thereby obtaining beads having two sets of pores, said method being characterised in that the emulsifier is a water-insoluble polymer capable of stabilizing said three-phase system.
摘要:
A retrofit diverter switch which has a mechanical and electrical interface that is compatible with the existing designs is provided. The diverter switch may include a vacuum switch. The feature where the mechanical and electrical interface is compatible enables a retrofit from traditional On Load Tap Changers to a vacuum based on Load Tap Changers. The diverter switch may be retrofitted into existing tap changer housings. Retrofitting from traditional to vacuum based, traditional to vacuum based and up rating, and vacuum up rating may be possible. Also, the diverter switch may include modular components that allow for easy customization of the diverter switch for different applications.
摘要:
A method for the manufacture of a solid porous separation material based on a polysaccharide, said method comprising the steps of: (a) providing an aqueous solution (I) of a polysaccharide, (b) solidifying the solution, preferably by transforming the solution to a gel, and (c) optionally cross-linking the polysaccharide, with the proviso that, if step (c) is present, steps (b) and (c) may be carried out simultaneously. The method is characterised in that the polysaccharide provided in step (a) is modified by being inter-molecularly cross-linked to an extent such that the viscosity of solution (I) is at least 110%, preferably at least 200%, of the viscosity of an aqueous solution (II) of the corresponding polysaccharide which has not been inter-molecularly cross-linked and which is present in the same concentration as the inter-molecularly cross-linked polysaccharide is in solution (I).