Numerical Simulations of the Ice Load of a Ship Navigating in Level Ice Using Peridynamics

In this study,a numerical method was developed based on peridynamics to determine the ice loads for a ship navigating in level ice.Convergence analysis of threedimensional ice specimen with tensile and compression loading are carried out first.The effects of ice thickness,sailing speed,and ice properties on the mean ice loads were also investigated.It is observed that the ice fragments resulting from the icebreaking process will interact with one another as well as with the water and ship hull.The ice fragments may rotate,collide,or slide along the ship hull,and these ice fragments will eventually drift away from the ship.The key characteristics of the icebreaking process can be obtained using the peridynamic model such as the dynamic generation of cracks in the ice sheet,propagation and accumulation of ice fragments,as well as collision,rotation,and sliding of the ice fragments along the ship hull.The simulation results obtained for the ice loads and icebreaking process were validated against those determined from the Lindqvist empirical formula and there is good agreement between the results.

Localization of Mobile Robot Aided for Large-Scale Construction Based on Optimized Artificial Landmark Map in Ongoing Scene

The effectiveness of mobile robot aided for architectural construction depends strongly on its accurate localization ability.Localization of mobile robot is increasingly important for the printing of buildings in the construction scene.Although many available studies on the localization have been conducted,only a few studies have addressed the more challenging problem of localization for mobile robot in large-scale ongoing and featureless scenes.To realize the accurate localization of mobile robot in designated stations,we build an artificial landmark map and propose a novel nonlinear optimization algorithm based on graphs to reduce the uncertainty of the whole map.Then,the performances of localization for mobile robot based on the original and optimized map are compared and evaluated.Finally,experimental results show that the average absolute localization errors that adopted the proposed algorithm is reduced by about 21%compared to that of the original map.

Influence of Internet Finance on the Financing of Small and Medium-Sized Enterprises in China

Small and medium-sized enterprises greatly promote the economic progress and growth of national tax revenue as well as realize the escalation of career opportunities.However,as these enterprises are relatively small scale and have low capacity to face and resist risks in addition to China's flawed financial credit system,there are many difficulties faced by these enterprises in terms of financing to achieve their own development and progress.Recently,owing to the progress of internet information,especially the expansion of its application in the financial field,it has opened up a way for handling the financing difficulties faced by small and medium-sized enterprises.According to the specific financing situation of small and mediumsized enterprises in China,this study analyzes the impact of internet finance on the financing of small and medium-sized enterprises in China and formulates strategies to effectively deal with the financing difficulties of small and medium-sized enterprises in China,thus promoting the sustainable progress of small and medium-sized enterprises.