298results about How to "Solve the stability is not high" patented technology

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

An implantable medical device for treating the back of a patient. Stimulation energy is delivered to muscles or joint capsules or ligaments or nerve fibers to improve the heath of the back.

A thermoelectric composition comprises a material represented by the general formula

(Ag_aX_1−a)_1±x(Sn_bPb_1−b)_mM′_1−yQ_2+m

wherein X is Na, K, or a combination of Na and K in any proportion; M′ is a trivalent element selected from the group consisting of Sb, Bi, lanthanide elements, and combinations thereof; Q is a chalcogenide element selected from the group consisting of S, Te, Se, and combinations thereof; a and b are independently >0 and ≦1; x and y are independently >0 and <1; and 2≦m≦30. The compositions exhibit a figure of merit ZT of up to about 1.4 or higher, and are useful as p-type semiconductors in thermoelectric devices.

Ionic liquids are incorporated into transducers, actuators or sensors which employ the ionic polymer membranes. The ionic liquids have superior electrochemical stability, low viscosity and low vapor pressure. The transducers, actuators and sensors which utilize ionic polymer membranes solvated with ionic liquids have long term air stability. Superior results are achieved when a conductive powder and ionomer mixture is applied to the ionic polymer membrane to form the electrodes during or after the ionic liquid is imbibed into the ionic polymer membrane.

A cellulose acylate solution containing a cellulose acylate which satisfies 2.5≦A+B≦3, 0≦A≦2.5, 0.3≦B≦3 (wherein A is the substitution degree of an acetyl group, and B is the sum of the substitution degrees of an acyl group having 3 to 7 carbon atoms) and whose content of sulfur atoms of residual sulfate moiety S is such that 50 ppm<S<500 ppm. When solution casting is carried out using this solution, a cellulose acylate film having good surface state and low peel-off load can be produced.

A semi-aromatic polyamide resin is provided which has a high level of residence stability, hot-water resistance and chemical resistance and is also excellent in adhesive properties and compatibility with other resins and the like.

The semi-aromatic polyamide resin comprises: dicarboxylic acid units in which 50 to 100 mol % of the dicarboxylic acid units are aromatic dicarboxylic acid units; and diamine units in which 60 to 100 mol % of the diamine units are aliphatic diamine units having 9 to 13 carbon atoms. Furthermore, at least 10% of terminal groups of molecular chains of the polyamide resin are blocked with a terminal-blocking agent, and the amount of terminal amino groups of the molecular chains is 60 μeq/g or more and 120 μeq/g or less. In addition, [NH₂]/[COOH]≧6 is satisfied, where [NH₂] (μeq/g) represents the amount of the terminal amino groups and [COOH] (μeq/g) represents the amount of terminal carboxyl groups.

An aerated food product is provided which includes hydrophobin. Also provided is the use of a hydrophobin in a method of inhibiting bubble coarsening in aerated food products.

The present invention relates to a permselective separation membrane that can be used in blood purifying treatment. More particularly, the present invention relates to a polysulfone-based permselective separation membrane which has well-balanced separation properties, highly stable safety and performance, and also can be smoothly assembled into a module, and a method for producing the same.

The present invention is to provide an organic light emitting display and a method of manufacturing the same, the light emitting display including: a first substrate on which a plurality of light emitting devices are formed; a second substrate disposed to face the first substrate; a dam member disposed between the first substrate and the second substrate to surround the plurality of light emitting devices; an inorganic sealing material disposed between the first substrate and the second substrate on an outward side of the dam member and attaching the first substrate and the second substrate; and a filling material provided between the first substrate and the second substrate on an inward side of the dam member and formed of at least one inert liquid selected from the group consisting of perfluorocarbon and fluorinert.

This invention relates to a synchronous rectifier for LLC resonant converter. This method allows simple drive method for the synchronous rectifier MOSFETS by using the transformer secondary winding voltage and one-shot vibrator. The synchronous rectifier MOSFETs are turned on by being triggered to the transformer secondary side winding voltage and turned off after predetermined time set by one shot vibrator. The predetermined time is set by the resonant period of the resonant network.

A polyamide composition comprising 50 to 90 parts by weight of (A) semiaromatic polyamides having dicarboxylic acid units containing 60 to 100 mole % of terephthalic acid units and diamine units containing 60 to 100 mole %, in total, of 1,9-nonanediamine units and/or 2-methyl-1,8-octanediamine units, and 50 to 10 parts by weight of (B) aliphatic polyamides in which the average of total carbon atoms of dicarboxylic acid units and diamine units per one amide group is 7 to 12; having excellent moldability, toughness, light-weightness, hot water and steam resistance, heat resistance, mechanical characteristics, low water absorption, chemical resistance and melt stability; and are applicable for molding at low temperature with a conventional steam-heating or a conventional hot-water-heating type mold to give molded articles having sufficient heat resistance, rigidity at high temperature and dimensional stability.

A semiconductor device is provided comprising a bilayer graphene comprising a first and a second adjacent graphene layer, and a first electrically insulating layer contacting the first graphene layer, the first electrically insulating layer comprising an electrically insulating material, and a substance suitable for creating free charge carriers of a first type in the first graphene layer, the semiconductor device further comprising an electrically insulating region contacting the second graphene layer and suitable for creating free charge carriers of a second type, opposite to the first type, in the second graphene layer.

A tellurite-based glass composition for use in EDFAs exhibits higher phonon energy without sacrificing optical, thermal or chemical durability properties. The introduction of boron oxide (B₂O₃) into the Er³⁺-doped tellurite glasses increases the phonon energy from typically 785 cm⁻¹ up to 1335 cm⁻¹. The inclusion of additional glass components such as Al₂O₃ has been shown to enhance the thermal stability and particularly the chemical durability of the boro-tellurite glasses. Er:Yb codoping of the glass does further enhance its gain characteristics.

A method of controlling NOx emission from combustors. The method involves the controlled addition of a diluent such as nitrogen or water vapor, to a base fuel to reduce the flame temperature, thereby reducing NOx production. At the same time, a gas capable of enhancing flame stability and improving low temperature combustion characteristics, such as hydrogen, is added to the fuel mixture. The base fuel can be natural gas for use in industrial and power generation gas turbines and other burners. However, the method described herein is equally applicable to other common fuels such as coal gas, biomass-derived fuels and other common hydrocarbon fuels. The unique combustion characteristics associated with the use of hydrogen, particularly faster flame speed, higher reaction rates, and increased resistance to fluid-mechanical strain, alter the burner combustion characteristics sufficiently to allow operation at the desired lower temperature conditions resulting from diluent addition, without the onset of unstable combustion that can arise at lower combustor operating temperatures.

The present invention relates to biologically active compositions and methods forelliciting an immune response, particularly against amyloid beta peptides by combinatory use of virosomes as adjuvants and a synthetic beta-peptide antigen.

The present invention is directed to pulverulent mixtures comprising hydrogen peroxide and hydrophobized, pyrogenically prepared silicon dioxide powder, preferably with a methanol wettability of at least 40. The pulverulent mixtures exhibit good storage stability and can be used for the controlled release of hydrogen peroxide and/or oxygen. The invention also includes methods of making these pulverulent mixtures and methods of using the mixtures in detergents, cleaning compositions, topical medications, antimicrobials and other products.

Synthesis of polystyrene and/or other thermoplastic polymers or polymer blends which, for example, contain activated carbon and/or bamboo carbon carrying a co-blowing agent such as water and/or at least one of 1-dimensional, 2-dimensional, and 3-dimensional nano/micro-materials in suspension polymerization without using the inverse emulsion process. CO₂ or other blowing agent based foaming processes such as extrusion, batch foaming, and injection molding may then be carried out to produce polymer foams that have low density, high-R value, bimodal structures, good mechanical properties, and high fire retardance.

The present invention provides a positive electrode active material for a secondary battery and a secondary battery including the same, which includes a core; a shell located to surround the core; and a buffer layer located between the core and the shell, and including a three-dimensional network structure connecting the core and the shell and a pore, in which the core, the shell, and the three-dimensional network structure in the buffer layer each independently include a lithium nickel-manganese-cobalt-based composite metal oxide, and the positive electrode active material has a BET specific surface area of 0.2 m²/g to 0.5 m²/g, a porosity of 30 vol % or less, and an average particle size (D₅₀) of 8 μm to 15 μm. The decomposition of the active material may be minimized by a rolling process in the manufacture of an electrode by controlling the specific surface area, average particle diameter and porosity of the active material particles as well as the specific structure, the reactivity with an electrolyte solution may be maximized, and the output and lifespan characteristics of the secondary battery may be improved since the particles forming the shell have crystal structure with orientation which facilitates intercalation and deintercalation of lithium ions.

The present invention relates to a fatty acid composition which contains an effective amount of fatty acids providing improved low temperature stability of the composition. The present invention also relates to a process for producing a fatty acid composition wherein the process comprises the steps of selecting a crude tall oil having a fatty acid concentration and type capabld of providing low temperature stability, distilling said crude tall oil to provide a fatty acid composition containing an effective amount of tall oil fatty acids providing low temperature stability. The fatty acid composition of the present invention is used as a fuel additive.

The present invention relates to a polymeric composition which has an excellent combination of properties for use in making seals and gaskets for utilization in appliances, automotive applications, and building applications, such as window glazing gaskets. These polymeric compositions offer excellent dimensional stability, low compression set, outstanding sealing characteristics, low temperature flexibility, heat resistance and ultra-violet light resistance. The present invention more specifically discloses a polymeric composition having excellent characteristics for utilization in manufacturing seals and gaskets including dimensional stability, low compression set and outstanding sealing characteristics, said polymeric composition being comprised of a blend of (A) a thermoplastic resin selected from the group consisting of polypropylene, polyethylene, poly phenylene ether, polystyrene, and styrene containing copolymer resins, (B) an elastomeric polymer selected from the group consisting of block copolymer comprising a first polymeric block that is comprised of repeat units that are derived from a vinyl aromatic monomer and a second block that is comprised of repeat units that are derived from a conjugated diolefin monomer, wherein the repeat units in the second block are hydrogenated, and wherein the repeat units in the second block are elastomeric in nature, and a crosslinked olefinic elastomer, (C) a high molecular weight crosslinked diene elastomer comprised of repeat units that are derived from conjugated diene monomer selected from the group consisting of 1,3-butadiene and isoprene, wherein the high molecular weight diene elastomer has a weight average molecular weight of at least about 200,000, and (D) an oil.

An intumescing, multi-component epoxide resin coating composition for fire protection with a component (A), which contains at least one epoxide resin and at least one vinyl ester, a curing agent component (B), which contains at least one curing agent for the epoxide resin, and an intumesing component (C), which contains at least one acid constituent, at least one source of carbon and at least one gas-forming agent, components (A) and (B) being kept separate from one another to prevent reaction and reacting with one another with polymerization only while being mixed, as well as the use of this coating composition for providing steel construction elements with a fire protection coating.

The present invention relates to a support for silver catalyst used in the ethylene oxide production, a preparation method for the same, a silver catalyst prepared from the same, and its use in the ethylene oxide production. The silver catalyst produced from the silver catalyst support has an improved activity, stability and/or selectivity in the production of ethylene oxide by epoxidation of ethylene.

There is provided an epoxy resin powder coating containing an epoxy resin, a curing agent, a curing accelerator and a polyol having a melting point of 40 to 110° C. The polyol is, for example, a polyether polyol or polyester polyol having a weight average molecular weight of 1,000 to 30,000 and is contained in an amount of 10 to 60 parts by weight based on 100 parts by weight of the epoxy resin. A film formed from the epoxy resin powder coating hardly undergoes peeling and the occurrence of cracks even when an article coated with the coating is deformed after the film is cured. The coating is also excellent in heat resistance and cracking resistance.