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Predicting the potential distribution of plant diversity in the Yakarigókdere forest district of the Mediteranean region

Özkan K., Berger U.

Polish Journal of Ecology

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2014

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Vol. 62, nr 3

441--454

EN

Biodiversity is of crucial importance for ecosystem health and functioning. It is thus one of the most important topics in forest ecology. This study focuses on modelling the spatial distribution of vascular plant diversity (H), richness (S) and evenness (E) in the Yukarıgökdere forest district (14667 ha) located in transition zone between Mediterranean and continental climates in the Mediterranean region, Turkey. Species abundance was sampled at 95 sample plots extending from 1000 to 1900 m a.s.l. in order to calculate the response variables (H, S, E). Climatic and topographical data served as explanatory variables. Multiple regression (ML) and classification and regression tree technique (CART) were used to obtain the distribution models of response variables. The better results were provided by CART. That is why visual assessments of the predicted values of the response variables based on (CART) were performed. The explained variances of the model trees were 63.4, 63.1 and 44.5% for H, S and E respectively. Elevation was found to be the most important environmental factor for all response variables. The higher H and S values were found at the east lower part (1000-1150 m a.s.l.) and the west upper part (1500–1800 m a.s.l.) of the district. The evenness (E) shows generally higher relative values in the upper part of the area. The lowest E specifies the area being optimal for tree growing. It is located between 1400 and 1500 m a.s.l., and ranges from the north to the south in the district.

2

Lutowanie miękkie i twarde - energoefektywne procesy spajania

Wilden J., Jahn S., Sabelfeld N., Rehfeldt L., Luhn T., Goecke S. F., Schmid E., Berger U.

Przegląd Spawalnictwa

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2010

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R. 82, nr 9

12-16

PL

Skomplikowane wyroby powstają bardzo rzadko z pojedynczych elementów. Ich wytwarzanie wymaga zastosowania odpowiednich metod łączenia. W określonych grupach zastosowań występuje duża liczba materiałów, które są często wykorzystywane w różnych połączeniach, tak aby wytwarzać produkty spełniające wymagania, także korzystne ze względów ekonomicznych. Ze wzrostem różnorodności nowoczesnych materiałów zaawansowanych o coraz większej wytrzymałości rosną również wymagania dotyczące metod łączenia. Z tego względu omówiono też metody łączenia struktur hybrydowych (wysokowytrzymałych materiałów, wrażliwych także na oddziaływanie wysokiej temperatury).

EN

Usually complex products are not only made from one single component. The production of such products requires a specific method for joining components. In point of designing and construction of components and assemblies many materials can be used. These materials are often used in combination in order to generate demanding and cheap products as well. Diversity of modern and innovating materials have increased and strength as well. Because of this, the requirements for joining materials together have increased as well. Methods for joining hybrid structure and high strength as well as heat sensitive materials are required.

3

Approach for the development of heuristic process planning tool for sequencing NC machining operations

Berger U., Kretschmann R, Arnold K P, Minhas S

Applied Computer Science

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2008

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Vol. 4, no 2

17--41

EN

This chapter deals with the process planning for sequencing NC (numerical control) machining operations. This task of selecting and ordering of machining operations is still done manually in principle. In order to overcome this problem, an approach for enabling the automatic preparation of work plans with methods known from the graph theory is introduced in this chapter. Therefore a work plan is mapped into a directed graph in a mathematically defined way. Based on that, it is possible to use algorithms to find the shortest path and a Hamiltonian path inside this directed graph as optimal sequenced solution under given requirements. Thus, the work plan is structured and re-ordered. Finally the corresponding NC machining code will be generated and distributed to the machinery.