Wyniki wyszukiwania - BazTech

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Baltic Sea Holocene evolution based on OSL and radiocarbon dating : evidence from a sediment core from the Arkona Basin (the southwestern Baltic Sea)

Kostecki R., Moskal P.

Oceanological and Hydrobiological Studies

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2017

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Vol. 46, No. 3

294--306

EN

The paper presents the chronology of the Holocene evolution of the Baltic Sea based on the optically stimulated luminescence (OSL) and radiocarbon dating methods applied to a core taken from the Arkona Basin. The dating results were supplemented by grain size and geochemical analysis. The obtained results of OSL and radiocarbon dating enabled the construction of an age-depth model and confirmed the continuous sedimentation since 9900 cal yrs BP. One of the most interesting findings of this study is a clear relationship between the rate of sedimentation and fluctuations in the energy of depositional environment. The analyzed sediment core revealed two sections of different accumulation rates. The bottom section was deposited until 2700 cal yrs BP when the Ancylus Lake and the Littorina Sea were present, characterized by the accumulation rate estimated at around 0.46 mm year-1 and the dynamic sedimentation environment confirmed by grain size parameters. The accumulation rate at the top section deposited during the Post-Littorina Sea stage was estimated at around 1 mm year-1. This stage, characterized by more stable deposition and lower-energy environment conditions, was confirmed by small grain size, symmetric skewness and increasing content of organic matter.

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Age and evolution of the Littorina Sea in the light of geochemical analysis and radiocarbon dating sediment of cores from the Arkona Basin and Mecklenburg Bay (SW Baltic Sea)

Kostecki R.

Landform Analysis

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2015

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Vol. 29

27--33

EN

Two sediment cores from the Mecklenburg Bay and Arkona Basin were analysed in terms of their geochemical composition and stratigraphy. The main stages of the Baltic Sea evolution – Baltic Ice Lake, Ancylus Lake, and Littorina Sea – were identified in both analysed cores. The most pronounced period was the transition between the Ancylus Lake and the Littorina Sea. The character of the initial stage of the Littorina Sea was clearly defined in the Mecklenburg Bay sediments and is marked by a stepwise increase in loss on ignition and contents of biogenic silica, calcium, magnesium, iron, and strontium. The record of the onset of the Littorina Sea in the Arkona Basin sediments is marked by an abrupt change of the geochemical parameters. The age of the initial Littorina Sea in the Mecklenburg Bay was estimated at about 8200 cal years BP and was probably older than the transgression within the Arkona Basin.

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Stages of the Baltic Sea evolution in the geochemical record and radiocarbon dating of sediment cores from the Arkona Basin

Kostecki R.

Oceanological and Hydrobiological Studies

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2014

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Vol. 43, No. 3

237--246

EN

Four sediment cores from the southern part of the Arkona Basin were analyzed in terms of their geochemical composition, age and stratigraphy. The main stages of the Baltic Sea: the Baltic Ice Lake, the Ancylus Lake and the Littorina Sea were identified in all the analyzed cores. The data confirmed the high water fluctuation and significant environmental changes during the Baltic Sea evolution in the Late - Glacial and the Holocene. The signs of the second regression of the Baltic Ice L ake, dated at around 11 000 cal BP, were identified at a depth of 24 m b.s.l. Regression of the Ancylus Lake, dated at 9300 cal BP, was identified at a depth of 23 m b.s.l. The most pronounced period was the transition stage between the Ancylus Lake and th e Littorina Sea. The record of the Littorina Sea onset in the sediments of the Arkona Basin is marked as a sudden increase in loss on ignition, biogenic silica, magnesium, calcium, iron and strontium. The age of the Littorina Sea in the Arkona Basin was es timated as younger than 8200 cal BP.

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Holocene evolution of the Pomeranian Bay environment, southern Baltic Sea

Kostecki R., Janczak-Kostecka B.

Oceanologia

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2011

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No. 53 (1-TI)

471-487

EN

This article focuses on the diatom assemblages and geochemical composition of sediment cores retrieved from the Pomeranian Bay. We also discuss similarities and differences in the diatom assemblages and the palaeogeographic development of nearby regions. Our main objective was to determine the characteristics and rate of the Littorina transgression in the Pomeranian Bay area. Sediments were divided into units based on differences in the distribution of diatom ecological groups and in geochemical ratios, such as Mg/Ca, Na/K and Fe/Mn. This study identified lacustrine sediments deposited during the time of the Ancylus Lake. This lacustrine-period sedimentation took place in a shallow lake under aerobic conditions. The record of the onset of marine environment dates to 8900-8300 cal BP and corresponds to the Littorina transgression. After about 8300 cal BP, sedimentation took place in a deeper marine environment with higher biogenic production and anaerobic conditions. The abrupt appearance of marine diatom species and increased geochemical salinity indicators reflect the large impact of the Littorina transgression on the Pomeranian Bay environment.

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Diatomological and geochemical evidence of littorina transgression in Pomeranian Bay, Southern Baltic Sea

Kostecki R., Janczak-Kostecka B.

Studia Quaternaria

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2010

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Vol. 27

27-33

EN

This article presents results of the analysis of 3 sediment cores taken from the bottom of Pomeranian Bay, southern Baltic Sea. These results are part of a larger project that aims to determine the characteristics and rate of the Atlantic marine ingression in the Pomeranian Bay area. The main geochemical elements and diatom assemblages from the cores were identified, revealing lacustrine sediments deposited during the time of Ancylus Lake and marine sediments deposited during the Littorina transgression. Distinct changes in the geochemical composition and diatom assemblages suggest that the Littorina transgression had a very large impact on the environment of Pomeranian Bay.

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Zastosowanie sieci bayesowskich do modelowania rolniczego procesu produkcyjnego

Maksym P., Marciniak A. W., Kostecki R.

Inżynieria Rolnicza

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2006

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R. 10, nr 12(87)

321-330

PL

Zastosowanie sieci bayesowskich do modelowania rolniczego procesu produkcyjnego oraz wspomagania decyzji odnośnie wyboru działań produkcyjnych przedstawiono z perspektywy budowania komputerowych systemów reprezentacji wiedzy. Metodykę budowania modeli sprowadzono do projektowania odpowiednich modułów rozpoznawania i predykcji i łączenia ich według określonych reguł. Zaproponowaną metodę omówiono na przykładzie modelowania produkcji pszenicy ozimej.

EN

Problem of agricultural production modeling with Bayesian Networks is discussed from the perspective of building knowledge representation systems in agricultural domain. Universal conceptualization schema of acting in changing and uncertain environments as cognitive cycles, implies the need of two elementary modules of BN, namely the recognition (diagnostic) and prediction module. Building BN model of agricultural production process can be decomposed into the design of elementary modules repository and then appropriate composing entire models with modules. Conceptualization and design of diagnostic and predictive modules, and then their linkage rules was shown on the examples concerned winter wheat production.

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Opracowanie modułu serwera dydaktycznego z zakresu ergonomii

Pawlak H., Kostecki R., Maksym P.

Inżynieria Rolnicza

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2005

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R. 9, nr 14

259--266

PL

Wykorzystując serwer dydaktyczny w Katedrze Podstaw Techniki, oraz wychodząc naprzeciw istniejącym trendom, rozbudowano go o zagadnienia dotyczące problematyki ergonomicznej. W poszczególnych panelach modułu znalazły się: informacje o Pracowni Ergonomii, tematyka realizowanych zagadnień w zakresie przedmiotu "Ergonomia", konspekty i instrukcje do ćwiczeń, przykładowe testy sprawdzające wiedzę, informacje o wynikach pracy studentów w trakcie semestru (zakodowane), formularz umożliwiający studentom wyrażanie opinii na temat realizowanych zajęć. Moduł ergonomiczny, tak jak pozostałe moduły serwera, dla większości ćwiczeń oparty jest o kognitywny model edukacji, który umożliwia tworzenie i przeprowadzanie eksperymentu zapewniającego aktywne poznawanie w oparciu o symulacje.

EN

Didactic server located in Department of Technology Fundamentals was extended with new module for teaching of Ergonomics. There were included the following categories of services: information about Laboratory of Ergonomics, syllabus for current ergonomic course, tutorials and instructions for exercises, examples of tests, information about student results (coded), form for students opinion acquisition. Ergonomics server module similarly as other modules was designed according to methodology of cognitive education where learning in an active cognition process through computer modeling and simulation experiments.

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Komputerowe wspomaganie realizacji wymagań ergonomicznych i BHP przy projektowaniu zakładów gastronomicznych

Kostecki R., Pawlak H., Maksym P.

Inżynieria Rolnicza

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2005

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R. 9, nr 8

161--169

PL

Biorąc pod uwagę liczbę placówek gastronomicznych i tempo ich rozwoju oraz warunki przystosowania ich do nowej sytuacji gospodarczo-rynkowej (duża konkurencyjność, wejście Polski do Unii Europejskiej, zwiększone wymagania ze strony klientów), w Katedrze Podstaw Techniki AR w Lublinie podjęto próbę stworzenia programu komputerowego wspomagającego realizację wymagań ergonomicznych i BHP. Program ma być stosowany przy ustalaniu wytycznych i kryteriów zarówno w realizacji obiektów nowych, jak i modernizacji już istniejących. Może być również stosowany przy ocenie istniejących placówek pod kątem spełniania przez nie wyżej wymienionych wymogów.

EN

Considering the growing number of restaurants and catering enterprises, their development rate and adaptation to new economic and market situation (strong competition, access of Poland to the EU, higher customers’ expectations), an attempt was made to develop a computer programme aiding the compliance with requirements concerning the ergonomics and work safety and hygiene in this line of business. The programme may be applicable at formulating directions and criteria to both, creation of new objects as well as modernization of the existing ones. It may be also useful at evaluation of existing enterprises in respect of fulfilling mentioned requirements.