The electrostatic spray technology can significantly improve the utilization rate of liquid medicine under operation characteristics unmanned aerial vehicles (UAVs) with small load and low volume. To explore settlement law droplets, further amount droplets deposited in target crops, reduce loss missing target, this study adopted method combining numerical simulation high-speed photography to mo...

To ensure that the missile is safely separated from internal weapons bay, jet used to control process of separation, which mounted on front edge bay. The length-to-depth ratio bay was L/D=8, diameter d1 =0.178 m, d2 =0.05 m . FLUENT software combined with our group-developed code under platform a user-defined function (UDF) solve flow field and six-degrees-of-freedom (6DOF) missile. detached ed...

Underwater rock-plug blasting is a special technique for excavating underwater inlets. In the process of excavation, blasting-block movement from difference in water pressure inside and outside tunnel one key factors successful construction. Laboratory experiments were conducted using small explosive charges, high-speed camera was adopted to observe study block motion. Then, numerical simulatio...

The liquid film formed around the inner walls of a small horizontal circular pipe often exhibits non-uniform distributions circumferentially, where is thinner at top surface than bottom one. Even with this known phenomenon, problem remains challenging task for Computational Fluid Dynamics (CFD) to predict formation on walls, mainly due inaccurate two-phase flow models that can induce an undesir...

The poor opening dynamic characteristics of molten salt check valves, used in concentrating solar thermal systems, constitute the main cause valve disc oscillation and low pressure difference difficulty during delivery. A swing is designed to meet requirements high-temperature high-pressure sealing anti-crystallization flow channels. transient dynamics model motion components established, mesh ...

Muti-channel flat heat pipe is an innovative technology recently used at the rear of photovoltaic cells to absorb and reuse wasted heat. To better understand fundamentals two-phase transfer (boiling condensation) taking place inside multi-channel pipes, a unique three-leg has been built. This one-of-a-kind was develop both computational fluid dynamic (CFD) theoretical models pipe. simulate oper...

The vortex-induced force of bridges is not synchronized along the span direction. spatial correlation becomes obvious when bridge structure gradually increases, and mass decreases. Therefore, it important to study spanwise forces long-span ensure accuracy prediction vibration response bridges. established improved theory experimental research methods for analysis large-span by discussing during...

Spark is a popular framework for writing large scale data processing applications. Our goal is to develop tools for reasoning about Spark programs. This is challenging because Spark programs combine database-like relational algebraic operations and aggregate operations with User Defined Functions (UDF s). We present the first technique for verifying the equivalence of Spark programs. We model S...

Uncertain data management has become crucial in many sensing and scientific applications. As user-defined functions (UDFs) become widely used in these applications, an important task is to capture result uncertainty for queries that evaluate UDFs on uncertain data. In this work, we provide a general framework for supporting UDFs on uncertain data. Specifically, we propose a learning approach ba...