Abstract: Proposed are a layered GaN compound, a nanosheet that may be prepared using the same, and an electrical device including the materials. Proposed is a layered compound represented by M1-xGayNz (M is at least one of Group II elements, and 0<x?1.0, 0.6?y?1.25, 0.75?z?1.5).

Abstract: Proposed are a layered Group III-V compound having ferroelectric properties, a Group III-V compound nanosheet that may be prepared using the same, and an electrical device including the materials. Proposed is a layered compound represented by [Formula 1] Mx?mAyBz (M is at least one of Group I or Group II elements, A is at least one of Group III elements, B is at least one of Group V elements, x, y, and z are positive numbers which are determined according to stoichiometric ratios to ensure charge balance when m is 0, and 0<m<x), and having ferroelectric-like properties.

Abstract: Proposed are a layered Group III-V compound having ferroelectric properties, a Group III-V compound nanosheet that may be prepared using the same, and an electrical device including the materials. Proposed is a layered compound represented by [Formula 1] Mx?mAyBz (M is at least one of Group I or Group II elements, A is at least one of Group III elements, B is at least one of Group V elements, x, y, and z are positive numbers which are determined according to stoichiometric ratios to ensure charge balance when m is 0, and 0<m<x), and having ferroelectric-like properties.

Abstract: Proposed are a layered GaN compound, a nanosheet that may be prepared using the same, and an electrical device including the materials. Proposed is a layered compound represented by M1-xGayNz (M is at least one of Group II elements, and 0<x?1.0, 0.6?y?1.25, 0.75?z?1.5).

Abstract: The present invention relates to: layered iron arsenide (FeAs), which is more particularly layered FeAs, which, unlike the conventional bulk FeAs, has a two-dimensional (2D) crystal structure, has the ability to be easily exfoliated into nanosheets, and has superconductivity; a method of preparing the same; and a FeAs nanosheet exfoliated from the same.

Abstract: Provided is to ultrasonic probe used in scanning defect of welded zone of tube, the ultrasonic probe includes a probe body having a predetermined length, a connection bar connected to one end of the probe body, a phased array ultrasonic sensor installed on one side surface of the probe body to scan positions and shapes of the defects, and a pair of time of flight diffraction (TOFD) sensors respectively installed in the same line with the phased array ultrasonic sensor therebetween to scan depths of the defects. The present invention having the above-described configurations may significantly reduce a time taken to scan and accurately scan the positions, the shapes, and the depths of the defects.

Abstract: Disclosed herein are a method of manufacturing a Ni-based superalloy component for a gas turbine using a one-step process of hot isostatic pressing (HIP) and heat treatment, and a component manufactured by the method. In the method, an HIP process and a heat treatment process, which have been performed to manufacture or repair a Ni-based superalloy component for a gas turbine, are performed as a one-step process using an HIP apparatus. Thus, component defects, such as micropores and microcracks, which are generated when casting, welding, or brazing the Ni-based superalloy component for a gas turbine used for a combined cycle thermal power plant or airplane, can be cured using an HIP apparatus at high temperature and high pressure and, at the same time, the physical properties of the Ni-based superalloy component can be optimized using the heat treatment process.

Abstract: Disclosed herein are a method of manufacturing a Ni-based superalloy component for a gas turbine using a one-step process of hot isostatic pressing (HIP) and heat treatment, and a component manufactured by the method. In the method, an HIP process and a heat treatment process, which have been performed to manufacture or repair a Ni-based superalloy component for a gas turbine, are performed as a one-step process using an HIP apparatus. Thus, component defects, such as micropores and microcracks, which are generated when casting, welding, or brazing the Ni-based superalloy component for a gas turbine used for a combined cycle thermal power plant or airplane, can be cured using an HIP apparatus at high temperature and high pressure and, at the same time, the physical properties of the Ni-based superalloy component can be optimized using the heat treatment process.