The Experts below are selected from a list of 101808 Experts worldwide ranked by ideXlab platform
Shintaro Miyazawa - One of the best experts on this subject based on the ideXlab platform.
-
Transport anisotropy of in-plane c-Axis aligned a-Axis oriented YBa2Cu3Ox thin films
Physica B-condensed Matter, 1994Co-Authors: Masashi Mukaida, Shintaro MiyazawaAbstract:Abstract The temperature dependence of resistivity, ϱb and ϱc, is measured for a perfectly in-plane c-Axis aligned a-Axis oriented YBa2Cu3O x thin film. In-plane alignment of the film is confirmed by X-ray o-scan (in-plane rotation) diffraction and reflection high-energy electron diffraction (RHEED) measurements. X-ray o-scan measurements and RHEED patterns reveal that the thin film has a twofold symmetry with no 90° domains, showing the c-Axis for the film is aligned in-plane. Resistivity-temperature curves for both c- and b-Directions show metallic behavior with a TC of 90.5 K. Resistivity in the c-Axis Direction at 290 K is 5.5 mΩcm, which is about eleven times larger than that of 500 μmΩcm for the b-Axis Direction. The resistivity anisotropy is in the same order as the coherence length. The temperature differential of normalized resistivity, d(ϱ(T)/ϱ(300))/dT, in the b-Axis Direction (2.8x10−3/K) is 2.5 times larger than that in the c-Axis Direction (1.1x10−3/K). This result clearly shows that the carrier transport in the b-Axis Direction is more metallic than that in the c-Axis Direction.
-
In‐plane alignment of a‐Axis oriented YBa2Cu3Ox thin films
Applied Physics Letters, 1993Co-Authors: Masashi Mukaida, Shintaro MiyazawaAbstract:The in‐plane orientation of a‐Axis oriented YBa2Cu3Ox thin films on SrLaGaO4 (100) substrates is studied by φ‐scan (in‐plane rotation) x‐ray diffraction, reflection high energy electron diffraction, and planar‐view transmission electron microscopy measurements. It is revealed that the thin films exhibit a twofold symmetry, indicating independent b‐ and c‐Axis orientations in the surface plane. There are no 90° domains, and the c‐Axis of a‐Axis oriented YBa2Cu3Ox thin films on SrLaGaO4 (100) is aligned to the [001] Direction of the substrate azimuth. The resistivity in the c‐Axis Direction at 290 K is 5.5 mΩ cm, about eleven times larger than that in the a‐Axis Direction. The temperature differential of normalized resistivity, d[R(T)/R(300)]/dT, in the c‐Axis Direction (1.1×10−3 K−1) is smaller than that in the b‐Axis Direction (2.8×10−3 K−1).
Masashi Mukaida - One of the best experts on this subject based on the ideXlab platform.
-
Transport anisotropy of in-plane c-Axis aligned a-Axis oriented YBa2Cu3Ox thin films
Physica B-condensed Matter, 1994Co-Authors: Masashi Mukaida, Shintaro MiyazawaAbstract:Abstract The temperature dependence of resistivity, ϱb and ϱc, is measured for a perfectly in-plane c-Axis aligned a-Axis oriented YBa2Cu3O x thin film. In-plane alignment of the film is confirmed by X-ray o-scan (in-plane rotation) diffraction and reflection high-energy electron diffraction (RHEED) measurements. X-ray o-scan measurements and RHEED patterns reveal that the thin film has a twofold symmetry with no 90° domains, showing the c-Axis for the film is aligned in-plane. Resistivity-temperature curves for both c- and b-Directions show metallic behavior with a TC of 90.5 K. Resistivity in the c-Axis Direction at 290 K is 5.5 mΩcm, which is about eleven times larger than that of 500 μmΩcm for the b-Axis Direction. The resistivity anisotropy is in the same order as the coherence length. The temperature differential of normalized resistivity, d(ϱ(T)/ϱ(300))/dT, in the b-Axis Direction (2.8x10−3/K) is 2.5 times larger than that in the c-Axis Direction (1.1x10−3/K). This result clearly shows that the carrier transport in the b-Axis Direction is more metallic than that in the c-Axis Direction.
-
In‐plane alignment of a‐Axis oriented YBa2Cu3Ox thin films
Applied Physics Letters, 1993Co-Authors: Masashi Mukaida, Shintaro MiyazawaAbstract:The in‐plane orientation of a‐Axis oriented YBa2Cu3Ox thin films on SrLaGaO4 (100) substrates is studied by φ‐scan (in‐plane rotation) x‐ray diffraction, reflection high energy electron diffraction, and planar‐view transmission electron microscopy measurements. It is revealed that the thin films exhibit a twofold symmetry, indicating independent b‐ and c‐Axis orientations in the surface plane. There are no 90° domains, and the c‐Axis of a‐Axis oriented YBa2Cu3Ox thin films on SrLaGaO4 (100) is aligned to the [001] Direction of the substrate azimuth. The resistivity in the c‐Axis Direction at 290 K is 5.5 mΩ cm, about eleven times larger than that in the a‐Axis Direction. The temperature differential of normalized resistivity, d[R(T)/R(300)]/dT, in the c‐Axis Direction (1.1×10−3 K−1) is smaller than that in the b‐Axis Direction (2.8×10−3 K−1).
Xiaoyan Song - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of Anti-Collapse Performance of Beam–Column Substructure with Welded Flange-Bolted Web Connection in Minor-Axis Direction Under Different Span Ratios
International Journal of Structural Stability and Dynamics, 2018Co-Authors: Weihui Zhong, Xiaoyan Song, Baoqian MaAbstract:The failure modes, mechanical properties, and resistance mechanisms of beam–column substructures with welded flange-bolted web connection in the minor-Axis Direction under different span ratios (1:0.6, 1:1.0, 1:1.4) were compared and analyzed under the condition of progressive collapse. The beam–column substructures included three columns and two beams, and monotonic static loading tests were conducted using the alternate load path method. The test results indicated that the specimens began to fracture at the beam tension flange; and then, part of the main internal force was transferred by the bolts on the web, followed by buckling of the compression flange at the beam end. Finally, specimens were deactivated by the shear failure of bolt holes or the fracturing of the web and junction plate. The joint with a welded flange-bolted web connection was found to have high redundancy, with sufficient rotational capacity after the fracture of the tension flange. As a result of the effective pulling force between the beam and column, combined with sufficient rotation of the beam end, the remaining structure could give full play to the catenary effect, which would play a leading role in the later stage of large deformation. The deformation of the beam–column joint increased rapidly, which was conducive to the beam–column substructure to bear the load by collaboration between the beam and column. The simplified model and the numerical simulation are proved to be reliable by test results. The results of numerical simulations and analyses of anti-collapse performances of beam–column substructures under different span ratios showed that the large beam-span ratio was beneficial to the development of ultimate failure displacement of the substructure and increase the ratio of ultimate to initial failure load. The resistance provided by catenary mechanism also increased, and the short beam developed a better catenary effect than the long one.
-
Analysis of Anti-Collapse Performance of Beam–Column Substructure with Welded Flange-Bolted Web Connection in Minor-Axis Direction Under Different Span Ratios
International Journal of Structural Stability and Dynamics, 2018Co-Authors: Weihui Zhong, Xiaoyan SongAbstract:The failure modes, mechanical properties, and resistance mechanisms of beam–column substructures with welded flange-bolted web connection in the minor-Axis Direction under different span ratios (1:...
Li Wanli - One of the best experts on this subject based on the ideXlab platform.
-
Dynamic Modeling and Simulation of Grab Crane Y Axis Direction Control System
Computer Simulation, 2010Co-Authors: Jia Hong-xia, Li WanliAbstract:Underground diaphragm wall grab control system maintains the verticality of diaphragm wall.Diaphragm wall grab crane Y Axis Direction hydraulic control system was designed.The control system consists of solenoid valves,dividing valves and hydro - cylinders.Alternating motions of the hydro - cylinders were fulfilled by solenoid valve' s switching,and then the control of the hydraulic grab in the Y Axis Direction was accomplished.With the theory of bond graph,establishing the power bond graph of hydraulic grab Y - Direction control system,integral actions of capacitive element and inertial element were selected as state variables and state equations of the system,and output equations were deduced.Pressure response of cylinders after simulation based on MATLAB proves that the stability and speediness of the control system are very excellent,and the control system is adequate for requirements of working.
Weihui Zhong - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of Anti-Collapse Performance of Beam–Column Substructure with Welded Flange-Bolted Web Connection in Minor-Axis Direction Under Different Span Ratios
International Journal of Structural Stability and Dynamics, 2018Co-Authors: Weihui Zhong, Xiaoyan Song, Baoqian MaAbstract:The failure modes, mechanical properties, and resistance mechanisms of beam–column substructures with welded flange-bolted web connection in the minor-Axis Direction under different span ratios (1:0.6, 1:1.0, 1:1.4) were compared and analyzed under the condition of progressive collapse. The beam–column substructures included three columns and two beams, and monotonic static loading tests were conducted using the alternate load path method. The test results indicated that the specimens began to fracture at the beam tension flange; and then, part of the main internal force was transferred by the bolts on the web, followed by buckling of the compression flange at the beam end. Finally, specimens were deactivated by the shear failure of bolt holes or the fracturing of the web and junction plate. The joint with a welded flange-bolted web connection was found to have high redundancy, with sufficient rotational capacity after the fracture of the tension flange. As a result of the effective pulling force between the beam and column, combined with sufficient rotation of the beam end, the remaining structure could give full play to the catenary effect, which would play a leading role in the later stage of large deformation. The deformation of the beam–column joint increased rapidly, which was conducive to the beam–column substructure to bear the load by collaboration between the beam and column. The simplified model and the numerical simulation are proved to be reliable by test results. The results of numerical simulations and analyses of anti-collapse performances of beam–column substructures under different span ratios showed that the large beam-span ratio was beneficial to the development of ultimate failure displacement of the substructure and increase the ratio of ultimate to initial failure load. The resistance provided by catenary mechanism also increased, and the short beam developed a better catenary effect than the long one.
-
Analysis of Anti-Collapse Performance of Beam–Column Substructure with Welded Flange-Bolted Web Connection in Minor-Axis Direction Under Different Span Ratios
International Journal of Structural Stability and Dynamics, 2018Co-Authors: Weihui Zhong, Xiaoyan SongAbstract:The failure modes, mechanical properties, and resistance mechanisms of beam–column substructures with welded flange-bolted web connection in the minor-Axis Direction under different span ratios (1:...