41results about How to "Small cell" patented technology

A hierarchical cell structure (HCS) cellular communications system includes a macro cell encompassing a smaller micro cell that employ the same frequency band. The macro cell includes a macro cell base station, and the micro cell includes a micro cell base station. An uplink communication cell boundary between the macro cell and the micro cell is established, and a downlink communication cell boundary between the macro cell and the micro cell is established. A radio network controller determines whether a condition exists in the HCS system which indicates that the uplink and downlink micro cell boundaries should be unbalanced. If the condition is met or exists, the power and / or antenna beam tilt of a downlink transmission from the micro cell base station is reduced to unbalance the uplink and downlink micro cell boundaries. Alternatively, the radio network controller may employ an offset value to mathematically reduce mobile detected pilot power levels associated with the micro base station.

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.

The invention relates to micropore polymethacrylimide foam with high thermal deformation temperature. The foam comprises, by mass, 35-60 parts of methacrylic acid (MAA), 65-40 parts of acrylonitrile, 0.10-4.0 parts of initiators, 1.0-20 parts of foaming agents, 1-5 parts of nucleating agents, 0.1-5 parts of cross-linking agents and 5-10 parts of heat-resisting additives; the initiators are azo-bis(4-cyano valeric acid) or mixtures of azo-bis(4-cyano valeric acid) and other azo compounds. The other azo compounds are azodiisobutyronitrile AIBN, azobisisovaleronitrile or azobisisoheptonitrile. According to the micropore polymethacrylimide foam high in thermal deformation temperature, the foam has the small pore diameter phi of 0.1-0.3 mm, thermal resistance is high, the thermal deformation temperature is high and is larger than 200 DEG C, and the mechanical property is excellent.

The present invention relates to the field of transgenic and non-transgenic plants with novel phenotypes. Provided are Solanum lycopersicum Auxin Response Factor 9 (SlARF9) proteins and nucleic acid sequences encoding these, which are useful in conferring novel phenotypes to plants, especially increased fruit size.

The invention discloses a novel aromatic high-fire-retardant polyester polyol as well as a preparation method and an application thereof. The novel aromatic high-fire-retardant polyester polyol is applied to a fire-retardant polyurethane material, and is applied to the field of building heat preservation. The novel aromatic high fire-retardant polyester polyol is obtained by esterification reaction of naphthalene-based aromatic dibasic acid, binary acid and small molecular alcohol or acid under the action of a catalyst and an antioxidant; the mass ratio of naphthalene-based aromatic dibasic acid to binary acid to the small molecular alcohol or acid is (0.7-1.5) to (2.8-4.6) to (5.7-8.6); the average functional group degree is 2; the acid value is smaller than 1mgKOH / g; the average hydroxyl value is 400-660mgKOH / g; the average molecular weight is 170-300g / mol; and the viscosity is 2500-4500mPa.s. The polyester polyol disclosed by the invention has high flame retardant property and excellent mechanical property; the polyurethane foam prepared by the method has thermal stability, good activity and good fire-retardant property, and also has good physical properties such as compression strength, closed porosity, abrasive resistance, ageing resistance and heat resistance. The novel aromatic high-fire-retardant polyester polyol is simple in synthesis process, is good in compatibility with other polyesters and polyester polyol; and the rigid polyurethane foam prepared by the novel aromatic high fire-retardant polyester polyol has relatively good heat resistance and fire resistance, and is applied to the field of building heat preservation.

The invention relates to a nano composite foaming agent and a preparation method and a foamed product thereof. The foaming agent is compounded from layered montmorillonite and 4,4-oxo-bis hydrazide, wherein the mass ratio of the 4,4-oxo-bis hydrazide to the montmorillonite is 1:(4-16). The composite foaming agent is obtained by a method of recombining and compounding the layered montmorillonite with the 4,4-oxo-bis hydrazide after stripping in preparation of the foaming agent. The foaming agent has the advantages that an organic foaming agent is embedded between nanoscale montmorillonite layers, so that the foaming agent is refined, the dosage of the foaming agent is effectively controlled, a nucleating point is increased, the foaming efficiency is improved, formed bubbles are even and small in holes, and meanwhile, the property of the obtained foamed product is also improved to a certain extent by adding of an inorganic material.

The invention provides a preparation method of an aerogel composite, comprising the steps of mixing melamine and a formaldehyde to obtain a melamine prepolymer; mixing the melamine prepolymer with a hardening agent, a foaming agent and deionized water to obtain a foam liquid; foaming the foam liquid to obtain foam; solidifying and annealing the foam to obtain melamine foam; thermally compressing the prepared melamine foam; combining the thermally compressed melamine foam with an aerogel to obtain the aerogel composite. The invention also provides the aerogel composite prepared via the preparation method. The small particle size characteristic of the aerogel and the porosity characteristic of the melamine are complemented; heat conduction ecoefficiency can be significantly improved, and thefragility defect of the aerogel can be overcome.