Abstract:
The present invention relates to a preparing method of a soluble graphene solution which includes a step of substituting a hydroxy group of graphene oxide into an easily removable functional group, and a step of reducing the result. The soluble graphene solution has chemical stability and easy storage properties, and is capable of being applied to various fields.
Abstract:
PURPOSE: A current lead-in wire module is provided to prevent a dielectric breakdown by applying the current lead-in wire module which installs an earth plate on the external surface of a solid insulator. CONSTITUTION: A solid part (630) surrounds a current lead-in wire. An earth plate (650) is installed on the surface of the solid part. A metal structure (620) is separately formed on the external side of the earth plate. A gas part (640) is made of gaseous insulation materials in a space between the earth plate and the metal structure. A power accumulation sheet (660) is formed into a type of one or more sheets which perform a power accumulation function within the solid part. [Reference numerals] (AA) Axial symmetry
Abstract:
본 발명은 콘크리트 보강 구조물에 관한 것으로서, 특히, 전부 또는 단부 일부가 콘크리트 구조물의 길이방향으로 형성된 설치 홈에 삽입 고정되는 섬유 강화플라스틱 패널(panel)과, 상기 섬유 강화플라스틱 패널의 양단부에 배치되어, 상기 콘크리트 구조물과의 부착된 부분을 고정하여 상기 콘크리트 구조물에 인장방향으로 연성 저항을 부여하는 전단 키와, 상기 섬유 강화플라스틱 패널의 상기 설치 홈에의 삽입 고정을 매개하는 설치 매개물을 포함하고, 상기 섬유 강화플라스틱은 복수개가 나란히 배치되되, 상기 복수개의 섬유 강화플라스틱 패널을 연결하면서 상기 콘크리트 구조물을 보강하는 보강 바를 더 포함하고, 상기 섬유 강화플라스틱 패널을 복수개로 나란히 배치할 경우에는, 상기 보강 바는 상기 콘크리트 구조물에 삽입 고정되도록 구성됨으로써, 섬유 강화플라스틱 부재의 부착성능을 향상시키는 이점을 제공한다.
Abstract:
PURPOSE: A heat pump is provided to simultaneously perform defrosting and heating functions by alternately using multiple heat exchangers as a condenser. CONSTITUTION: A heat pump comprises a compressor (211), an indoor heat exchanger, an outdoor heat exchanger (213), an expansion valve (214), a four-way valve (215), an accumulator (216), a bypass valve (217), a first three-way valve (218), and a second three-way valve (219). The compressor compresses a refrigerant discharged from the accumulator and discharges the compressed refrigerant to the outside. The outdoor heat exchanger comprises first and second heat exchangers. The indoor heat exchanger is operated as an evaporator or a condenser. The expansion valve decreases the temperature and pressure of the refrigerant. The four-way valve controls the circulation direction of the refrigerant. The bypass valve controls the amount of the bypassed refrigerant. The first and second three-way valves have first, second, and third sides.
Abstract:
PURPOSE: A manufacturing method of vanadium-aluminum composites for a hydrogen production membrane and the composites manufactured by the same are provided to enable rapid hydrogenation and dehydrogenation at low pressures and to reduce the manufacturing costs of the hydrogen production membrane. CONSTITUTION: A manufacturing method of vanadium-aluminum composites for a hydrogen producing membrane is as follows: a step of mixing vanadium powder and aluminum powder in a container; a step of pressurizing the container to a hydrogen gas condition; and a step of mechanically alloying the mixed powder in the hydrogen gas condition. [Reference numerals] (AA) Prepare vanadium powder and aluminum powder; (BB) Mix the vanadium powder and the aluminum powder by the composition of V-xAI (x=1-5wt.%); (CC) Insert the mixed powder and a milling ball into a container; (DD) Deaerate the container and pressurize the container to a hydrogen gas condition; (EE) Performing a planetary-type mole milling process(200rpm, 72hours)
Abstract:
PURPOSE: A lead-free piezoelectric ceramics and a manufacturing method of the same are provided to enhance the piezoelectric and dielectric property of a piezoelectric ceramics by adding (Ba0.85Ca0.15)Ti0.88Zr0.12 into a ceramics based on (K0.5Na0.5)0.95Li0.05NbO3-AgSbO3. CONSTITUTION: A lead-free piezoelectric ceramics is represented by chemical formula 1, 0.95 (K0.5Na0.5)0.95Li0.05NbO3- (0.05-x) AgSbO3-x (Ba0.85Ca0.15)Ti0.88Zr0.12O3 (0.02
Abstract:
PURPOSE: A lithium secondary battery is provided to offer high capacity, charging density, electrochemical property, and excellent lifetime property of a positive electrode active material having a core-shell two layer structure. CONSTITUTION: A production method of a composite metal oxide which is a precursor for a positive electrode active material for a lithium secondary battery comprises the following steps: selecting three kinds of compounds from nickel, cobalt, iron, manganese, and aluminum to produce a metal solution; adding a precipitation agent and a carrier to the metal solution, inserting the mixture into a continuous reactor for stirring and obtaining a core unit; mixing the core unit with a transition metal mixed aqueous solution, the precipitation agent, and the carrier to form a transition metal oxide layer on the surface of the core unit as a shell; and filtering, washing, and drying to obtain the precursor. The positive electrode active material has a core-shell two layer structure. The precipitation agent is sodium carbonate, and the carrier is an ammonia solution.
Abstract:
PURPOSE: A transmitting and receiving device for transmitting and receiving channel state information reference signals at a giant multiple input multiple output system operating in a frequency division duplex mode and a method thereof are provided to effectively transmit the channel information of various antennas and enable a receiving device to effectively estimate downlink channel state information using only downlink resources of limited amount. CONSTITUTION: A control part (1030) generates a signal for each beam to be transmitted through each antenna port. The control part forms the beam by precoding the signal for the each beam generated through a beam forming vector. The control part separates the resource reusing groups of an arbitrary number through grouping beams which is sharing the same resources of the formed beam. The control part transmits the beam to a receiving device by allocating the resource by the resource reusing group. The control part allocates the resources by determining the beam in which a transmitting device has a maximum benefit using feedback information transmitted from the receiving device. [Reference numerals] (1010) Wireless communication part; (1020) Storage part; (1030) Control part; (1031) Signal generation part by beams; (1032) Precoding part; (1033) Scheduler
Abstract:
PURPOSE: An electrolyte containing a novel urea-containing imidazolium iodide compound, which exists in a quasi-solid(gel) state with large viscosity is provided to ensure excellent stability when being used for an electrolyte of a dye-sensitized solar cell, and to ensure transport capacity of an anionic material in a cell. CONSTITUTION: A urea-containing imidazolium iodide is denoted by chemical formula 1 or 2. A method for preparing the compound of chemical formula 1 comprises: a step of reacting iminopropyl imidazole of chemical formula 3 with R_2-NCO of chemical formula 4 to prepare a compound of chemical formula 5; and a step of reacting the compound of chemical formula 5 with R1-I of chemical formula 6. An electrolyte for a dye-sensitized solar cell contains the urea-containing imidazolium iodide of chemical formula 1 or 2.
Abstract:
PURPOSE: A naphthylphenyl derivative and an organic electroluminescent device using the same as a charge injection layer, a charge transport layer, a phosphorescent host, or a light emitting layer are provided to be easily applied for deposition and a solution process, and to ensure energy transfer property and compatibility. CONSTITUTION: A naphthylphenyl derivative is denoted by chemical formula 1. An organic electroluminescent device contains one or more organic layers between a pair of electrodes. The organic layer contains the naphthyl phenyl derivative. The organic layer includes a light emitting layer, a charge injection layer, a charge transport layer, and a hole transport layer and contains the naphthyl phenyl derivative. The organic layer is a light emitting layer. The light emitting layer contains the naphthyl phenyl derivative and further contains a phosphorescent dopant.