Papers by Keyword: Square

Abstract: The electrical characteristics of the 1.2-kV rated 4H-SiC accumulation-channel split-gate octagonal cell MOSFET (SG-OCTFET) are experimentally compared with linear, square, hexagonal, octagonal, and compact-octagonal cell topologies. The specific on-resistance of the SG-OCTFET is 52% larger than the conventional linear cell topology. However, the SG-OCTFET has: (i) high-frequency figure-of-merit HFFOM[R_on×C_gd] 9.4×, 6.1×, 2.6×, 2.0×, and 1.8× superior to the square, hex, linear, octagonal, and compact-octagonal cells; (ii) fastest switching performance among all cell topologies, with 26% smaller switching energy loss than the conventional linear cell topology; and (iii) short circuit capability 1.5× longer than the conventional linear cell topology. The SG-OCTFET device is therefore an optimum candidate for high frequency applications of SiC MOSFETs.

Abstract: A new model of the projectile motion for the resistance being proportional to the square of velocity components is investigated. In the course of the projectile motion, the direction of the resistance and the direction of the velocity are not entirely the opposite and on a straight line, in which the deviation angle exists. The size and the interrelation of velocity components determinate the size of the deviation angle, where deviation angles of some points take zeroes and another points take maximum values. The article makes deeply analysis for the new projectile model of velocity components, and gives interesting results.

Abstract: This paper focuses on the characterization of the behaviour of Concrete Filled Steel Tubular (CFST) columns made with Rubberized Concrete (RuC), and on the development of an accurate numerical model for the simulation of CFST columns under monotonic and cyclic bending. The test campaign involves 18 CFST specimens with different configurations, namely the cross-section slenderness, the concrete strength, the axial load level and the lateral loading type. All CFST members tested exhibited good ductility under monotonic loading. The Eurocode 4 design provisions was verified against the test results and the design capacities of the CFST members were validated to be conservative. A comprehensive 3D Finite Element (FE) model was developed and calibrated based on test results. The FE model proved to be reliable in predicting the bending behaviour of CFST member, in terms of local buckling deformation modes, ultimate capacity and ductility of the CFST columns.

Abstract: Cantilever CMM(short for coordinate measuring machine) is non-orthogonal type one with large measurement range, small volume, light weight, low cost, but lower precision. Error calibration and compensation is an important way to improve the measurement accuracy . This paper presents a new calibration method for the length of articulated arm just using the square. Facility requirement is relatively low and it is easy to operate. Comparing with that measured by laser interferometer, this method has a relatively high accuracy, having a certain value in practical measurement.

Abstract: The square has experienced thousands of years since its initial generation in the world, but some relatively stable element of the square has not changed as the time passing by, and they have played a passive role during the process of square evolution. The aim of the program is to find the essential characteristics of the typical main exhibition hall plaza morphology of the Garden Expo through coordinating the city, the architecture and the people, so as to solve the function configuration, and the same to provide an orderly and beautiful environment for the visitors.

Abstract: A square is an important multi-functional public space on campus, which can be used as a venue for traffic, gathering, recreational activities and cultural events, and thus the thermal environment of the campus square will directly influence the overall environmental quality of campus. This paper studies a campus square in the summer-hot and winter-cold region, selects typical positions to conduct actual measurement of parameters, such as temperature, relative humidity, wind speed and solar radiation, which indicate the thermal environment. Based on data collection and analysis, it is concluded that the thermal environment of the campus square is affected by microclimate factors such as the square underlying surface properties, vegetation and building and road orientations. This paper is aimed at exploring the regularity of the correlation between microclimate factors and thermal environment in order to facilitate the improvement of the thermal environment of the campus square, make it more comfortable and provide ideas for the landscape and architectural environment design.

Abstract: The die profile plays an important role in reduction of extrusion load, evolution of uniform micro-structure and overall improvement of surface integrity of extruded product. In the present investigation, a numerical analysis has been carried out for extrusion through cosine die profile using DEFORM software for plane strain deformation using rigid plastic material. The extrusion load has been predicted. The effective stress, strain, strain rate and velocity distribution have been determined. It is proposed to investigate the evolution of uniform microstructure and the effect of strain hardening in the extrusion process in future work.