A semiconductor memory devices and a method of fabricating the same includes sequentially stacking a tunnel insulating layer, a first nano-grain film, a conductive layer for a floating gate, and a second nano-grain film over a semiconductor substrate, forming a trench by etching the second nano-grain film, the conductive layer for the floating gate, the first nano-grain film, the tunnel insulating...

PURPOSE: A device for cleaning a belt surface of a belt conveyor is provided to effectively clean the belt surface regardless of the shape of the belt surface. CONSTITUTION: A device for cleaning a belt surface of a belt conveyor is composed of a casing(20) installed at the lower part of a return belt(10) and having opening/closing plates(22), an air expanding unit installed in the casing and expa...

PURPOSE: A level maintenance and safety apparatus for leveller is provided to improve quality of strip products and prevent safety accident during repairing operation by stably maintaining level maintenance of upper frame and stably supporting the upper frame during repairing operation of work rolls of the leveller at the same time. CONSTITUTION: In a leveller comprising an upper work roll(150) in...

A method for cold forming a segmented aluminum curved plate for spherical type LNG tank is provided to press-mod a cold plate material without heating it, thereby saving the cost for installation of heating furnace, transport facility and support. A method for cold forming a segmented aluminum plate for spherical type LNG tank includes a step of press-molding a segmented curved plate(10) gradually...

A material surface processing device is provided to perform surface process of fixed quality by reducing the deviation of quality of each surface dealing process. A material surface processing device comprises: a surface processing part(20) being equipped in a device frame and processing the surface of a material(1); and a material convey part(50) being equipped in the device frame to convey the m...

A chromium-free surface-treated steel plate of resin abbreviation type, a manufacturing method for the same, and chromium-free processing liquid for the same are provided to reduce manufacturing processes and to save manufacturing cost since a resin processing is omitted after a chromium-free processing. A manufacturing method for a chromium-free surface-treated steel plate of resin abbreviation t...

PURPOSE: A converter refining method of molten steel is provided which stably controls phosphorus at the terminal point by supplying oxygen to coating material slag to increase content of iron oxide in the slag, thereby promoting slagmaking of quicklime and phosphorus oxidation removing reaction in the early stage of blowing. CONSTITUTION: In a converter refining method comprising slag coating of ...

PURPOSE: A spheroidizing annealing method is provided which is capable of rapidly softening medium carbon steel in a short time by maintaining the medium carbon steel for a certain time in a section where carbide is grown fast and rapidly cooling the medium carbon steel in other section in the cooling step of the medium carbon steel. CONSTITUTION: In a method for spheroidizing annealing medium car...

PURPOSE: A method for manufacturing steel product having superior critical delayed fracture strength and other mechanical properties using dual phase characteristics of ferrite and residual austenite as shortening graphitization time for securing cold forming property is provided. CONSTITUTION: The method comprises a step of air cooling a wire rod after graphitization in the temperature range of A...

PURPOSE: A method for manufacturing steel product having superior critical delayed fracture strength and other mechanical properties using dual phase characteristics of ferrite and residual austenite as shortening graphitization time for securing cold forming property is provided. CONSTITUTION: The method comprises a step of air cooling a wire rod after graphitization in the temperature range of A...

PURPOSE: A method for manufacturing total temper quality black plate having temper classes of T1 to T6 without secondary rolling facility by properly controlling adding quantity of Nb, atomic ratio of Nb/C and weight ratio of Al/N and controlling hot rolling and coiling conditions, thereby improving recovery characteristics is provided. CONSTITUTION: The method for manufacturing black plate compri...

An apparatus for removing foam in an alkali tank of strip cleaning line is provided to enhance the recycling of alkaline solution by changing the foam into reusable alkaline solution and to prevent damage to components due to corrosion. An apparatus for removing foam in an alkali tank of strip cleaning line comprises a cylindrical tank(12), a cover(15) which is mounted to cover the top of the tank...

A band pass filter is provided to minimize the signal loss due to capacitive coupling. A band pass filter is composed of a first strip line, a first capacitor, a second strip line, a second capacitor and a third strip line. The first strip line(210) is formed between an input terminal and a ground unit. The first capacitor(240) is connected to the first strip line in parallel. The second strip lin...

The present invention relates to a dual centrifugal chiller, and it is an object of the present invention to provide a dual centrifugal chiller which is configured so that a turbo chiller having two compressors, two evaporators and two condensers lowers the head of the compressors, and that the compressors are operated with the same heads. The above object can be accomplished by the provision of a...

PURPOSE: A common exhaust pipe for a multi-cylinder diesel engine is provided to change the location of an exhaust gas maximum pressure pulse by connecting top and bottom main exhaust pipes to the common exhaust pipe. CONSTITUTION: A common exhaust pipe for a multi-cylinder diesel engine comprises top and bottom main exhaust pipes(10,20) and a common exhaust pipe(40). A turbine(30) is installed at...

PURPOSE: A method for manufacturing a capacitor of a semiconductor device is provided to prevent degradation of devices due to the difference of physical property by using the same material as a barrier metal film of a lower and upper electrode. CONSTITUTION: An interlayer dielectric(21) with trenches is formed on a substrate. Lower electrodes(24a,24b) with a barrier metal film are formed in the t...