We consider the problems of completing a low-rank positive semidefinite square matrix M or a low-rank rectangular matrix N from a given subset of their entries. We study the local and global uniqueness of such completions by analysing the structure of the graphs determined by the positions of the known entries of M or N . We show that the unique completability testing of rectangular matrices is...

Microscale roughness on an otherwise smooth hydrophobic surface can significantly reduce the resistance to an external liquid flow. We study static drag reduction over a lubricantinfused surface by looking at an array of two-dimensional transverse grooves partially filled with a second immiscible fluid. Numerical simulations at separate length scales are used to probe the static drag reduction ...

Centrifuge-based cell salvage and washing systems, available since the 1970s, have decreased the use of allogeneic blood transfusions (1). Although intraoperative salvage and autotransfusion avoids the risks of allogeneic transfusion, case reports document adverse reactions to this blood, potentially related to inadequate washing (2). The cleanliness of partially filled cell salvage bowls has b...

In this study, optimization is carried out to find the optimized design of a foam-filled column for the best Specific Energy Absorption (SEA) and Crush Force Efficiency (CFE). In order to maximize SEA, the optimization gives the value of 2.3 for column thickness and 151.7 for foam length. On the other hand to maximize CFE, the optimization gives the value of 1.1 for column thickness and 200 for...

Regarding increasing importance of tank wagons and efficiency in fluids transportation, their usage is increasing every day. Thus paying attention to their designs just as dynamic analysis of wagons during travelling time is vitally important. In this task, sloshing coefficient as prominent parameter in tank wagons designing has been investigated. To ease of efficient design, theses parameters ...

In this paper natural convection heat transfer within a two-dimensional, horizontal, concentric cam shape cylinders that is partially filled with a fluid saturated porous medium has been investigated. both cylinder are kept at constant and uniform temperatures with the outer cylinder being subjected relatively lower than the inner one. In addition the forchheimer and brinkman effect are taken i...

The flow velocity distribution in partially-filled circular pipe was investigated in this paper. The velocity profile is different from full-filled pipe flow, since the flow is driven by gravity, not by pressure. The research findings show that the position of maximum flow is below the water surface, and varies with the water depth. In the region of near tube wall, the fluid velocity is mainly ...

The effect of sinusoidal vibration is numerically investigated on the settling dynamics a heavy particle circular shape immersed in viscoplastic fluid obeying regularized Bingham–Papanastasiou (BP) model. Having modeled solid as highly viscous Newtonian droplet, we have relied finite element method for solving equations motion and surrounding fluid. Our numerical results could closely recover t...