The role of the audience in contemporary data art

As a new form of contemporary art, data art has changed the audience’s artistic experience. This paper first introduces the characteristics of data art which are different from other contemporary art. Secondly, in the context of public participation in art, it explores how data art enables audiences to participate in various stages of artistic creation, so that audiences can become one of the creators rather than mere art connoisseurs. Finally, it summarizes participatory issues in different stages of data art

Atomization Performance Study of a Fuel Injector in IGC by Experimental and Numerical Investigation

AbstractFuel spray and atomization characteristics play an important role in the performance of internal combustion engines. Experimental and numericalatomization studies of the fuel injector used in IGC (Inner Guide-vane Combustor) under various assembly and operation conditions have been performed in order to determine the configurations of the fuel injector proposed for use in IGC.Droplet Sauter MeanDiameter (SMD) distributions were measured with Phase Doppler Analyzer (PDA) at differentoperating conditions and used to evaluate the atomization performance. Computational Fluid Dynamic (CFD)study has also been conducted based on Discrete Particle Model (DPM).Current work examines optimizing the atomizer location and assembly condition of these vanes and the cavity within them. Results reveal thatthe distribution of droplet SMDvaries with the assembly and operation condition. The further results showed that fuel injector used in IGC with single slot, forward injection direction and ‘<’ shaped backsplash type can get the best atomization performance compared with other cases teste

Driver’s Lane Selection Model Based on Phase-Field Coupling and Multiplayer Dynamic Game with Incomplete Information

Intelligent driving is an effective means to achieve the active safety of automobile, and the accurate prediction of vehicle group situation is the premise to achieve the intelligent driving of vehicle. Lane selection and lane changing are not only the most fundamental reasons for the transformation of vehicle group situation, but also the basic contents for the research on driver behavior of traffic flow theory. In this paper, with a view to the background of Internet of Things, the vehicle group situation was given a comprehensive consideration on the basis of the factors which influence driver’s behavior. The driver’s lane selection behavior was analyzed under the condition of incomplete information, and lane selection model based on phase-field coupling and multiplayer dynamic game with incomplete information was constructed considering the time-varying character of driving propensity. The means of actual driving experiment, virtual driving experiment, and microscopic simulation of traffic flow were used to verify the model. The verification results showed that the model built in this paper can objectively reflect the actual operation characteristic of traffic flow on road section and the process of lane selection. The theoretical basis of the research on lane selection can be provided for intelligent driving especially anthropomorphic driving under the condition of Internet of Things. Document type: Articl

Modeling Hidden Nodes Collisions in Wireless Sensor Networks: Analysis Approach

This paper studied both types of collisions. In this paper, we show that advocated solutions for coping with hidden node collisions are unsuitable for sensor networks. We model both types of collisions and derive closed-form formula giving the probability of hidden and visible node collisions. To reduce these collisions, we propose two solutions. The first one based on tuning the carrier sense threshold saves a substantial amount of collisions by reducing the number of hidden nodes. The second one based on adjusting the contention window size is complementary to the first one. It reduces the probability of overlapping transmissions, which reduces both collisions due to hidden and visible nodes. We validate and evaluate the performance of these solutions through simulations

Petrogenesis of middle Okinawa Trough volcanic rocks: Constraints from lead isotopes in olivine-hosted melt inclusions

Olivine-hosted melt inclusions provide crucial information about their parental magma composition and evolution and represent ideal targets for determining the nature of the poorly understood and still-debated magma sources in the Okinawa Trough, a back-arc basin in the western Pacific. We present the first analyses of the lead (Pb) isotope compositions of olivine-hosted melt inclusions to evaluate the mantle properties and petrogenesis of middle Okinawa Trough volcanic rocks. The melt inclusions have more variable major and trace elements and Pb isotope compositions than the host whole-rock samples. We report the discovery of both high-207Pb/206Pb (> 0.865) and low-207Pb/206Pb (< 0.865) isotope compositions in melt inclusions in individual volcanic rocks, even within a single host olivine, indicating a compositionally heterogeneous magma source. The trace element and Pb isotope characteristics of the melt inclusions show that the magma source is affected by enriched components. We modeled the injection of enriched components into a magma source to explain the generation of the magma heterogeneity. The results indicate that the mixing of Pacific Ocean-type mantle (MORB), an EMI-like component from recycled lower continental crust and EMII-like material from subducted sediments can explain the low-207Pb/206Pb isotope values observed in the melt inclusions. The discovery of small proportions of melt inclusions with high 207Pb/206Pb ratios, high K2O, P2O5, Rb and U contents and low Pb and Cu contents in the studied andesites suggests that the andesitic magma may have been formed by the mixing of materials with different elemental and isotopic compositions. Our study results suggest that pervasive magma mixing may have occurred in the magma source prior to eruption in the Okinawa Trough.This work was supported by the National Natural Science Foundation of China (Grant No. 91958213), the National Programme on Global Change and Air-Sea Interaction (Grant No. GASIGEOGE-02), the Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences (Grant No. MGE2019KG07), the International Partnership Program of Chinese Academy of Sciences (Grant No. 133137KYSB20170003), the National Special Fund for the 13th Five Year Plan of COMRA (Grant No. DY135- G2-1-02), the Special Fund for the Taishan Scholar Program of Shandong Province (Grant No. ts201511061), the Qingdao Postdoctoral Applied Research Project, the National Key Basic Research Program of China (Grant No. 2013CB429700) and Shandong Provincial Natural Science Foundation, China (Grant No. ZR2019BD010)

Numerical investigation on shock train control and applications in a scramjet engine

Different factors which help to control the shock train in the scramjet isolator and combustor were analyzed via numerical investigations, and were applied to a whole scramjet engine in the working environment. A streamline traced Busemann inlet is proposed and simulated along with an isolator. During the combustor design, the influence of boundary layer thickness, slot bleeding, cavity and hydrogen injection position on the basic combustor performance with uniform inlet flow condition are investigated, and it was found that the boundary layer bleeding could prevent the shock train from moving upstream, and the cavity could further enhance the combustion efficiency. By arranging hydrogen injections at certain intervals, it could reduce the combustion back pressure. An improved basic model by integrating the aforementioned advantages is then numerically studied. The results have shown that the improved combustor model contained a section of shock train which can reduce the loads on the isolator. Another model with bleeding slots in the isolator is also found able to raise the maximum chemical equivalence ratio from 0.7 to 1, but unfortunately it comes with undesirable combustion efficiency decrease