نتایج جستجو برای: distance to trees
تعداد نتایج: 10669823 فیلتر نتایج به سال:
For a graph G, and two distinct vertices u v of let $$ n_{{G(u,v)}} n G ( , ) be the number that are closer in to than v. Miklavi? Šparl arXiv:2011.01635v1 define distance-unbalancedness $${{\mathrm{uB}}}(G)$$ uB as sum $$|n_G(u,v)-n_G(v,u)|$$ | - over all unordered pairs G. positive integers up 15, they determine trees T fixed order with smallest largest values $${\mathrm{uB}}(T)$$ respectivel...
the gutman index and degree distance of a connected graph $g$ are defined as begin{eqnarray*} textrm{gut}(g)=sum_{{u,v}subseteq v(g)}d(u)d(v)d_g(u,v), end{eqnarray*} and begin{eqnarray*} dd(g)=sum_{{u,v}subseteq v(g)}(d(u)+d(v))d_g(u,v), end{eqnarray*} respectively, where $d(u)$ is the degree of vertex $u$ and $d_g(u,v)$ is the distance between vertices $u$ and $v$. in th...
One of the important features of plant communities is the spatial pattern of trees. The spatial pattern of the stands determined by measuring and positioning of trees in the stands and inserting them in analytical frameworks. This is because spatial information allows natural resource managers to make and perform better-informed decisions, -. The aim of this study was to assess the spatial patt...
one of the most visible aspects of a forest stand structure is the spatial patterns of trees. competition affects on forest structure and its understanding is important, when the purpose of forest management is to imitate the dynamic of natural ecosystems. for this purpose, an unmanaged intact forest was selected with 26 hectares area. all chestnut leaf oak (quercus castaneifolia) trees with a ...
boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...
The ecological relationship between trees is important in the sustainable management of forests. Studying this relationship in spatial ecology, different indices are applied that are based on distance to nearest neighbor. The aim of this research was introduction of important indices based on nearest neighbor analysis and their application in the investigation of ecological relationship between...
Taxus baccata L. is a native and ancient tree species growing the Hyrcanian forests that have been considered in recent years because of being in the red lists of threated species. The aim of this research was to provide quantitative characteristics of forest stand structure using a set of indicators in the natural habitat of this species. Three one-hectare sampling area were selected to ...
Quercus brantii Lindl. and Pistacia atlantica Desf. are the most important tree species in Zagros forests, The abundant use of these trees by the inhabitants of the area has led to a reduction in the quality and quantity of these valuable species, as well as the creation of heterogeneous masses.Recognizing the spatial pattern and the interactions of trees can be a key to managerial interve...
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