The paper proposes a new double-stage large flow protection relief valve based on the linkage structure, to solve problem that when it is impacted by top plate, traditional hydraulic support protective has smaller overflow and lower sensitivity, which causes column circuit be damaged. field characteristics of are numerically simulated computational fluid dynamics method semi-implicit connection...

The visual system has a remarkable ability to reconstruct 3-D structure from moving 2-D features. The processing of structure from motion is generally thought to consist of two stages. First, the direction and speed of features is measured (2-D velocity measurement) and, second, 3-D structure is reconstructed from the measured 2-D velocities (3-D structure recovery). Most models have assumed th...

A singular biological economic model which considers a prey-predator system with time delay and stage structure is proposed in this paper. The local stability at the equilibrium point and the dynamic behavior of the model are studied. Local stability analysis of the model without time delay reveals that there is a phenomenon of singularity-induced bifurcation due to the economic equilibrium. Fu...

Double-dwell acquisition structures have typically been proposed as better alternatives to single-dwell structures from the point of view of the Mean Acquisition Time (MAT). Traditional approaches divide the double-dwell structure into an acquisition stage with short integration time, followed by a verification stage with longer integration time, which should provide a smaller global false alar...

This paper presents a new robust two-stage Data Envelopment Analysis (DEA) for efficiency evaluation of the electricity power production and distribution companies. DEA has been widely used for benchmarking the electricity companies. Traditional studies in DEA consider systems as a whole when measuring the efficiency, ignoring the operation of individual processes within a system. To tackle thi...

A two-stage method for the computational prediction of the structure of protein-ligand complexes is proposed. Given an experimentally determined structure of the protein, in the first stage a large number of plausible ligand conformations is generated using the fast docking algorithm FlexX. In the second stage these conformations are minimized and reranked using a method based on a classical fo...