The invention relates to a power distribution system (1), especially a Power-over-Ethernet system, comprising at least one dominant sensor, which may be located within a powered device (4) like a lighting device, and at least one non-dominant sensor, which may be located within another powered device (4), wherein the power distribution system is adapted such that in a system low power mode the at least one dominant sensor (6) consumes power provided by a power providing unit (3) and the at least one non-dominant sensor (6) does not consume the provided power and that the power distribution system (1) switches from the system low power mode to a system high power mode, if the at least one dominant sensor (6) has sensed an event. Since in the system low power mode the at least one non-dominant sensor does not consume power, the power consumption can be reduced.

A filtration membrane coating comprising a hydrophilic polymer, a surfactant, and one or more charged compounds, each containing one or more sulfonate functionalities and one or more linkable functionalities selected from the group consisting of amine, monochlorotriazine, and dichlorotriazine. The hydrophilic polymer and surfactant form a thin primer layer which is also superhydrophilic. The primer layer improves flux, and enables improved adhesion of the one or more charged compounds, which form a charged dye layer on top of the primer layer when enhances rejection of charged divalent ions. The coating can be applied while the membrane is packaged in its final form, such as in a spiral wound or other configuration.

Disclosed is a statistical copolymer that includes both zwitterionic repeat units and hydrophobic repeat units and a filtration membrane that contains a selective layer formed of the statistical copolymer. Also disclosed are methods of preparing the above-described filtration membrane.

The present invention relates to a composite semipermeable membrane including a supporting membrane and a separation functional layer disposed on the supporting membrane, in which the separation functional layer comprises an aromatic polyamide, the aromatic polyamide has side chains and terminal groups, at least one of the side chains and terminal groups of the aromatic polyamide being an amino group, at least one of the side chains and terminal groups of the aromatic polyamide is a substituent having a structure represented by formula (1): NXY or formula (2): NXYZ, and in the aromatic polyamide, a content A of substituents having structures represented by formula (1) and formula (2) and a content B of amide groups satisfy 0.005?A/B?0.15.

A pressure-resistant porous macromolecular PMMA filter membrane material comprises the following ingredients in parts by weight: 60-95 parts of PMMA, 60-90 parts of MMA, 0.5-25 parts of surfactant and 5-25 parts of water. The filter membrane material is simple in preparation process, and the prepared pressure-resistant porous macromolecular filter membrane material contains no bubble, has a uniform pore size, an adjustable micro pore size of 0.01-12 ?m, a special-purpose pore size of 13-80 ?m, a porosity of 20-38% and a water permeability rate greater than 20%. The filter membrane material has the characteristics of reusability, light weight, high mechanical strength, excellent impact resistance, high pressure resistance, low molding shrinkage, good water permeability, adjustable pore size and the like.

The present invention provides a separation membrane that is usable at a high temperature and a high pressure. The solvent-resistant separation membrane of the present invention has an average pore diameter of the separation membrane surface of 0.005 to 1 ?m and includes a portion where a degree of cyclization (I.sub.1600/I.sub.2240) as measured by the total reflection infrared absorption spectroscopy is 0.5 to 50.

The invention relates to a power distribution system (1), especially a Power-over-Ethernet system, comprising at least one dominant sensor, which may be located within a powered device (4) like a lighting device, and at least one non-dominant sensor, which may be located within another powered device (4), wherein the power distribution system is adapted such that in a system low power mode the at least one dominant sensor (6) consumes power provided by a power providing unit (3) and the at least one non-dominant sensor (6) does not consume the provided power and that the power distribution system (1) switches from the system low powermode to a system high power mode, if the at least one dominant sensor (6) has sensed an event. Since in the system low power mode the at least one non-dominant sensor does not consume power, the power consumption can be reduced.

The present invention relates to a filtration membrane with high chemical resistance comprising a porous support with a primary titanium oxide powder and a secondary titanium oxide powder, wherein the primary powder has a grain size between 10 and 50 microns, and the secondary powder has a grain size at least 2 times smaller than the grain size of the primary powder, the grain size of the secondary powder being larger than 5 microns, and wherein the primary powder represents at least 50% by weight with respect to the total weight of the porous support, such that the porous support has a pore size between 1 and 7 microns and a percentage of porosity greater than 30%.

Porous filters having uniform pore size and close packing density are described, along with methods and apparatus for making the porous filters based on nanopatterning. One method includes applying a polymeric liquid to a mold consisting of an array of posts having a desired pore size and distribution. Solidification of polymeric membrane followed by separation from the mold produces a polymer membrane with a predetermined spaced array of pores. A pre-filter film can also be bonded with the membrane during formation to provide increased mechanical support and filtration of larger particles on the input side of the filter. Other process variants are described, including methods for incorporating additional functionalities to the filter.

A composite semipermeable membrane includes: a porous support including a porous resin layer; and a separation functional layer formed of a polyamide-based resin on the porous resin layer. The polyamide-based resin contains a resin component derived from a divalent polyfunctional amine and a trivalent or higher polyfunctional acid halide, a molar ratio of the trivalent or higher polyfunctional acid halide to the divalent polyfunctional amine is in a range of 0.65 to 1.00, and a terminal carboxyl group concentration is 0.01 or less. The composite semipermeable membrane has an amide intensity ratio of 0.60 or more, the amide intensity ratio being a ratio of an absorption peak intensity derived from C?O stretching vibration of an amide group to an absorption peak intensity derived from a repeating unit of the porous resin layer, when measuring the absorption peaks by an ATR-IR method.