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Representatives of the family Actinostromatidae (Stromatoporoidea) in the Devonian of southern Poland and their ecological significance

Wolniewicz P.

Geologos

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2016

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Vol. 22, No. 3

227--249

EN

Stromatoporoids of the family Actinostromatidae are common constituents of Givetian to Frasnian (Devonian) organic buildups. The species-level structure of actinostromatid assemblages from the Devonian of southern Poland is described in the present paper, with special emphasis on ecological factors that influenced species composition of the communities. Nine species of the genera Actinostroma and Bifariostroma are distinguished. Members of the family Actinostromatidae predominated in stromatoporoid assemblages within lower Frasnian carbonate buildup margins. The most diverse actinostromatid faunas were found within the middle Givetian Stringocephalus Bank, in the upper Givetian–lower Frasnian biostromal complex and in the lower Frasnian organic buildups. Species-level biodiversity was lowest within detrital facies which surrounded the Frasnian carbonate buildups. Species of Actinostroma with well-developed colliculi are commonest within the middle Givetian to early Frasnian coral-stromatoporoid biostromal complexes, whereas species with strongly reduced colliculi predominate early-middle Frasnian organic buildups. The skeletal structure of actinostromatids reflects environmental changes, documenting a transition from species with thin, close-set pillars and widely spaced laminae (common in the middle Givetian) to those with long, thick pillars and megapillars (in Bifariostroma), which were predominant during the early and middle Frasnian. The distribution of growth forms among species reveals a significant intraspecific variation. Species of Actinostroma can be either tabular or low domical, depending on the palaeoenvironmental setting. Thus, the present study confirms that stromatoporoid morphology was influenced by environmental conditions.

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Accessing Grid Computing Resources with g-Eclipse Platform

Wolniewicz P., Meyer N., Stroiński M., Stuempert M., Kornmayer H., Polak M., Gjermundrod H.

Computational Methods in Science and Technology

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2007

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Vol. 13, nr 2

131-141

EN

In the paper we present how g-Eclipse can be used for easy running computation on Grid resources. The g-Eclipse project is an EU-founded project that aims to build an integrated workbench framework to access the power of existing Grid infrastructures. The g-Eclipse framework provides a general, integrated workbench toolset for Grid users, operators and developers. It is very useful for inexperienced users to interact with Grid resources independently of the underlying Grid middleware. The Grid abstraction enables Grid users to access the Grid in a desktop-like manner with wizards specified for common use cases.

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Multi-instalment divisible job processing with communication startup cost

Wolniewicz P.

Foundations of Computing and Decision Sciences

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2002

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Vol. 27, No. 1

43-57

EN

Divisible job model is a very efficient tool representing a certain kind of distributed computations. It can be applied to jobs that can be divided into an arbitrary number of independent tasks. In this paper we analyse a new type of communication that can shorten the processing time. Two types of processing elements are taken into account: with or without the communication subsystem.