Introducing tree neighbouring relationship factors in forest pattern spatial analysis:weighted Delaunay triangulation method

It is important to quantify and analyze forest spatial patterns for studying biological characteristics,population interaction and the relationship between the population and environment.In this study,the forest spatial structure unit was generated based on the Delaunay triangulation model(DTM),and the weights were generated using the comprehensive values of the tree diameter at breast height,total height and crown width.The distance between neighbors determined by the DTM was weighted to transform the original coordinates of trees into logical coordinates.Then,a weighted spatial pattern(WSP)was developed.After weighting,the neighboring trees were replaced,the replacement ratio was 38.3%,and there was 57.4%of the central tree.Correlation analysis showed that the uniform angle index of the WSP was significantly correlated with the tree size standard deviation under uniformity(r=0.932)and randomness(r=0.711).The DTM method not only considers the spatial distance between trees,but also considers the non-spatial attributes of trees.By changing the spatial topological relation between trees,this method further improves the spatial structure measurement of forest.

Research on the Ideological Politics Education of College Students from the Perspective of New Media

With the continuous development of the economy and society,new media technologies have been widely used in every industry and all walks of life.New media technologies are also applied in the ideological politics education of the Chinese college students.Therefore,this article makes a brief analysis of college education in the context of the new media technology.New media technology is applied to the ideological politics education of college students,which not only places the emphasis on the importance of ideological politics in an intuitive manner towards the students,but also creates a good social atmosphere and innovates the ideological and moral education model.

Assembly of 3D-printed Ti scaffold and free vascularized fibula using a customized Ti plate for the reconstruction of mandibular defects

Introduction Mandibular segmental defects result in significant cosmetic and functional deficiencies.Meanwhile,the reconstruction of both the contour and function of the mandible is a challenging task.At present,autologous vascularized fibula transplantation is the most common method to reconstruct a mandible with long-span defects[1].