Under certain conditions, nonmetallic inclusions such as oxides, sulfides, nitrides and carbides are no longer harmful to steel service properties. With the new concept of oxide metallurgy, these properties can be im...Under certain conditions, nonmetallic inclusions such as oxides, sulfides, nitrides and carbides are no longer harmful to steel service properties. With the new concept of oxide metallurgy, these properties can be improved by generating fine oxide inclusions which serve as heterogeneous nuclei for sulfide and fine ferrite. A novel continuous casting (CC) process is expected to be created with the utilization of oxide metallurgy. This is also useful for the forthcoming technologies of direct rolling and near-net-shape casting. The main idea of oxide metallurgy consists of an alternative oxidation technology. It is based on steels treated by complex metals such as Ti, Zr, Ti-Zr alloys and rare earth metals. The selected deoxidants should follow the required conditions which are concluded in this paper. (Author abstract) 45 Refs.展开更多
With the increase of communication frequency,terahertz(THz)communication technology has been an important research feld;particularly the terahertz modulator is becoming one of the core devices in THz communication sys...With the increase of communication frequency,terahertz(THz)communication technology has been an important research feld;particularly the terahertz modulator is becoming one of the core devices in THz communication system.Te modulation performance of a THz communication system depends on the characterization of THz modulator.THz modulators based on diferent principles and materials have been studied and developed.However,they are still on the way to practical application due to low modulation speed,narrow bandwidth,and insufcient modulation depth.Terefore,we review the research progress of THz modulator in recent years and evaluate devices critically and comprehensively.We focus on the working principles such as electric,optical,optoelectrical,thermal,magnetic,programmable metamaterials and nonlinear modulation methods for THz wave with semiconductors,metamaterials,and 2D materials(such as graphene,molybdenum disulfde,and tungsten disulfde).Furthermore,we propose a guiding rule to select appropriate materials and modulation methods for specifc applications in THz communication.展开更多
文摘Under certain conditions, nonmetallic inclusions such as oxides, sulfides, nitrides and carbides are no longer harmful to steel service properties. With the new concept of oxide metallurgy, these properties can be improved by generating fine oxide inclusions which serve as heterogeneous nuclei for sulfide and fine ferrite. A novel continuous casting (CC) process is expected to be created with the utilization of oxide metallurgy. This is also useful for the forthcoming technologies of direct rolling and near-net-shape casting. The main idea of oxide metallurgy consists of an alternative oxidation technology. It is based on steels treated by complex metals such as Ti, Zr, Ti-Zr alloys and rare earth metals. The selected deoxidants should follow the required conditions which are concluded in this paper. (Author abstract) 45 Refs.
基金The work was fnancially supported by Te National Key R.&D.Plan of China(2016YFB0402700,2017YFB0405400)The National Natural Science Foundation of China(61774175,61674146,and 61875140)+4 种基金The National Natural Science Foundation of China(Key Program:61634006)The Opened Fund of the State Key Laboratory of Integrated Optoelectronics(No.IOSKL2017KF12)the Key Program of Natural Science Foundation of Beijing(4181001)The Leading Project of Youth Academic Team@Minzu University of China(Sensor and Microsystem:317201929)Young and Middle-Aged Talents Training Program of State Ethnic Afairs Commission.
文摘With the increase of communication frequency,terahertz(THz)communication technology has been an important research feld;particularly the terahertz modulator is becoming one of the core devices in THz communication system.Te modulation performance of a THz communication system depends on the characterization of THz modulator.THz modulators based on diferent principles and materials have been studied and developed.However,they are still on the way to practical application due to low modulation speed,narrow bandwidth,and insufcient modulation depth.Terefore,we review the research progress of THz modulator in recent years and evaluate devices critically and comprehensively.We focus on the working principles such as electric,optical,optoelectrical,thermal,magnetic,programmable metamaterials and nonlinear modulation methods for THz wave with semiconductors,metamaterials,and 2D materials(such as graphene,molybdenum disulfde,and tungsten disulfde).Furthermore,we propose a guiding rule to select appropriate materials and modulation methods for specifc applications in THz communication.
