A systematic experimental study is conducted on floating field rings (FFR) incorporated into 4H-SiC junction barrier Schottky (JBS) diodes across four voltage ratings 650, 1200, 1700 and 3300V, in pursuit of highly efficient FFR designs. 30 designs 3 categories are studied for each rating, the measured breakdown (Vbr) JBS divided by ring system width (W) taken as figure merit (FOM) design. The ...

Owing to environmental regulations, ships are equipped with a pre-swirl stator (PSS), which is one of the most effective energy-saving devices (ESDs) that widely applied various kinds ships. It improves energy efficiency by recovering rotational kinetic propeller aid PSS placed in front propeller. In this study, an asymmetric system 2500 TEU eco-friendly liquefied natural gas (LNG) fuel feeder ...

Extracting coal mine methane (CMM) is important for underground mining safety. The tree-type borehole drainage (TTBD) technique can effectively remove from seams. Determining a suitable drilling pattern multiple boreholes will promote the efficient application of this in mines. Aimed at solving problem that optimum extraction layout unclear, study first constructed full-coupled thermo-hydro-mec...

Abstract Spacing between check dams depends on the stream bed slope, effective height of check dams and slope of deposited sediments behind the check dams. The slope of deposited sediments is more important than the other two factors because of complications in the way of its occurrence and its measurement after several years of dam construction. This research presents the effective factors a...

Laminar natural convection from an array of horizontal isothermal cylinders confined between two vertical walls, at low Rayleigh numbers, is investigated by theoretical and numerical methods. The height of the walls is kept constant, however, number of the cylinders and their spacing, the distance between the walls and Rayleigh number have been varied. The optimal spacing (confining walls) and ...

this study was aimed to the examination of the effect of tillage row spacing and bush spacing on the performance and components of phaseou vulgaris var. (line: cos16). the investigation was conducted as cut terraces and in terms of complete random blocks in three replicates at brujerd agricultural research and natural resources in the agricultural year 2009-2010. here, the main terraces with th...