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The occurrence of caverns, vugs, fractures, or fractures plus vugs is typically characteristic of a carbonate or volcanic reservoir, such as an Ordovician carbonate reservoir in Tarim or a Carboniferous volcanic reservoir in Karamay. Because the two reservoir types are highly heterogeneous and they are distributed in blocks, it is difficult to determine the productivity of a well therein. For this...
Piezoelectric materials are frequently used as transducers. Piezoelectric bending mode elements can be used to harvest vibration energy because they can convert mechanical energy into electrical energy. In this article, we present the derivation of the equation for electrical admittance of the symmetrical triple-layer flexural piezoelectric vibrator. The triple-layer piezoelectric vibrator is here...
Tetrahedron Block (TB) is a commonly used material in river closure and dike protection engineering. A 3D hydrodynamic model, which is based on the commercial Computational Fluid Dynamics (CFD) code Fluent, is developed to predict velocity fields and drags of the single TB in flow with different free stream directions. The realizable k-ε model is adopted for turbulent closure of the Reynolds Averaged...
Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG becomes an interesting research topic. This paper develops the DFIG model of power flow and third-order transient in which the power converter is simulated...
This paper presents a new mathematical definition of straight-line optical flow. By using 21 straight-line optical flows in 3 consecutive image frames, a set of equations about 3D motion parameters are established to obtain 12 motion parameters of 3D object and coordinates of the 3D straight line. Usually, it is difficult to find the 21 straight lines on correspondence. In this paper, a minimum of...
According to special demand of energy control for the routing of wireless sensor networks and balancing the energy of nodes, this paper proposes multipath routing based on ant colony system (MACS). The algorithm utilizes the self-organization, self-adaptability and dynamic optimization capabilities of the ant colony to find the optimal routing and suboptimal routing from Sources to the Sink in order...
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