نتایج جستجو برای: succession

تعداد نتایج: 11436  

2016
Yongfu Chai Ming Yue Xiao Liu Yaoxin Guo Mao Wang Jinshi Xu Chenguang Zhang Yu Chen Lixia Zhang Ruichang Zhang

Quantifying the drivers underlying the distribution of biodiversity during succession is a critical issue in ecology and conservation, and also can provide insights into the mechanisms of community assembly. Ninety plots were established in the Loess Plateau region of northern Shaanxi in China. The taxonomic and phylogenetic (alpha and beta) diversity were quantified within six succession stage...

Journal: :Family process 2011
Alexandra Solomon Douglas Breunlin Katherine Panattoni Mara Gustafson David Ransburg Carol Ryan Thomas Hammerman Jean Terrien

This qualitative study used a grounded theory methodology to analyze life-story interviews obtained from 10 family business owners regarding their experiences in their businesses with the goal of understanding the complexities of family business succession. The grounded theory that emerged from this study is best understood as a potential web of constraints that can bear on the succession proce...

2007
VINCENT VAJNOVSZKI

ECO-method and its corresponding succession rules allow to recursively define and construct combinatorial objects. We introduce here succession functions which refine succession rules. They permit to construct general efficient algorithms for classes of combinatorial objects and to find some new classes more easily than previous methods. We apply succession function technique for a lot of class...

Journal: :Ecology 2012
Maarten Schrama Matty P Berg Han Olff

Current theories about vegetation succession and food web assembly are poorly compatible, as food webs are generally viewed to be static, and succession is usually analyzed without the inclusion of higher trophic levels. In this study we present results from a detailed analysis of ecosystem assembly rules over a chronosequence of 100 years of salt marsh succession. First, using 13 yearlong obse...

Journal: :Theor. Comput. Sci. 2002
Luca Ferrari Elisa Pergola Renzo Pinzani Simone Rinaldi

In this paper we will give a formal description of succession rules in terms of linear operators satisfying certain conditions. This representation allows us to introduce a system of well-deened operations into the set of succession rules and then to tackle problems of combinato-rial enumeration simply by using operators instead of generating functions. Finally we will suggest several open prob...

2005
FRANCE MAPHOSA

The greatest challenge facing the indigenisation of African economies is the problem of succession. A Mean businesses have always died with their founders. This phenomenon is caused by failure by the business founders to properly plan for the succession. Drawing from a case study of 10 smallscale indigenous businesses in Zimbabwe and from literature on African indigenous businesses, this articl...

Journal: :Enseñanza de las Ciencias. Revista de investigación y experiencias didácticas 2013

2003
William H. Romme Claudia M. Regan Merrill R. Kaufmann Laurie Huckaby Thomas T. Veblen

The ecosystems within the area that burned in the Hayman Fire have a long history of fire (see part 1 of this chapter). It follows, therefore, that all of the native species and populations in this area probably have one or more mechanisms for enduring fire or becoming reestablished after fire and that no native species is likely to become extinct as a result of the direct effects of the Hayman...

Journal: :CoRR 2013
Stefano Bilotta Elisa Pergola Renzo Pinzani Simone Rinaldi

In this paper we present a method to pass from a recurrence relation having constant coefficients (in short, a C-recurrence) to a finite succession rule defining the same number sequence. We recall that succession rules are a recently studied tool for the enumeration of combinatorial objects related to the ECO method. We also discuss the applicability of our method as a test for the positivity ...

2015
Mathilde Bouvel Veronica Guerrini Simone Rinaldi

We provide a new succession rule (i.e. generating tree) associated with Schröder numbers, that interpolates between the known succession rules for Catalan and Baxter numbers. We define Schröder and Baxter generalizations of parallelogram polyominoes (called slicings) which grow according to these succession rules. We also exhibit Schröder subclasses of Baxter classes, namely a Schröder subset o...

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