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1

Preliminary studies on the spatial distribution of artificial 137Cs and natural gamma radionuclides in the region of the Ojców National Park, Poland

Stobiński M., Jędrzejek F., Kubica B.

Nukleonika

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2018

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Vol. 63, No. 4

105--111

EN

The aim of the research is to obtain preliminary information about the spatial distribution of gamma radionuclides in the soils taken from the Ojców National Park with emphasis on the behaviour of artificial radionuclides, with 137Cs as a representative. The natural radionuclides 40K, 226Ra (uranium series), and 228Th (thorium series), which are considered as background radiation, were also determined. In total, 18 soil samples were collected during the summer periods in 2015–2017, while the sampling points were selected with respect to differences in rainfall and local topography gradient. The method was based on gamma-ray spectrometry performed on high-purity germanium (HPGe) gamma detector (relative efficiency 34%). 137Cs was mostly deposited in the top soil layers, with activity in the range of 27.9÷586.6 Bq•kg–1. We found strong positive correlation of the 137Cs activity with the soil organic matter content, and at the same time, its dependence on the rainfall amount. Consequently, the soil types and local climate can control the spatial distribution of 137Cs on a small spatial scale. The quantity of natural radionuclides was highly similar in all samples with the following mean values: 38.0 Bq•kg–1 for 228Th, 33.1 Bq•kg–1 for 226Ra, and 479.9 Bq•kg–1 for 40K.

2

Model of designating the critical damages Part 2: The probabilistic model of shaping Machine’s Priority Number

Zwolińska B., Kubica B.

Journal of KONBiN

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2017

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No. 42

353--378

EN

The article consists of two parts which make for an integral body. This article depicts the method of designating the critical damages in accordance with lean maintenance method. Author considered exemplary production system (serialparallel) in which in time Δt appeared a damage on three different objects. Article depicts the mathematical model which enables determination of an indicator called “prioritized digit of the device”. In the developed model there were considered some parameters: production abilities of devices, existence of potential vicarious devices, position of damage in the production stream based on the capacity of operational buffers, time needed to remove the damages and influence of damages to the finalization of customers’ orders – CEF indicator.

PL

Artykuł składa się z dwóch integralnych części. W drugiej części artykułu przedstawiona została metoda wyznaczania uszkodzeń krytycznych, zgodnie z metodyką lean maintenance. Rozważaniom został poddany przykładowy układ produkcyjny, w którym w chwiliΔt wystąpiło uszkodzenia na kilku różnych obiektach. W artykule został zaprezentowany model kształtowania Liczby Priorytetowej Urządzenia (LPU), który uwzględnia następujące parametry systemu produkcyjnego: zdolność produkcyjną poszczególnych maszyn, występowanie ewentualnych urządzeń zastępczych, pozycję w potoku produkcyjnym oraz pojemność i czas zapełniania (opróżniania) buforów międzyoperacyjnych. Wyznaczona Liczba Priorytetowa Urządzenia uwzględnia również wpływ występujących uszkodzeń obiektów analizowanego systemu produkcyjnego na realizację zamówień klienta w oparciu o wskaźnik Customer Efect Factor (CEF).

3

Self-absorption correction and efficiency calibration for radioactivity measurement of environmental samples by gamma-ray spectrometry

Misiak R., Hajduk R., Stobiński M., Bartyzel M., Szarłowicz K., Kubica B.

Nukleonika

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2011

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Vol. 56, No. 1

23-28

EN

In this work empirical functions which relate the full-energy peak efficiency with sample height, energy, matrix composition and bulk density for voluminal samples in a cylindrical counting geometry were found. Accurate determination of the radioactivity of gamma-emitting radionuclides in environmental samples requires taking into account self-absorption. For the obtained self-absorption correction factor, a direct transmission method was chosen. Finally, this paper proposes a simple correlation between the self-absorption correction factor and the bulk density and height of the measured sample for a given energy.

4

Sorption of lead(II) on copper(II) and nickel-potassium hexacyanoferrates and magnetite-loaded resin from inorganic acid solutions

Kubica B.

Nukleonika

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2010

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Vol. 55, No. 2

163-168

EN

The sorption of Pb2+ on the composite sorbent obtained by incorporating of copper(II)-potassium hexacyanoferrate or nickel(II)-potassium hexacyanoferrate and magnetite into sulphonated phenolic resin was studied. The sorption kinetics were performed in hydrochloric, nitric and sulphuric acid solutions in the concentrations range from 10-4 molźdm-3 to 1 molźdm-3. The distribution coefficients for the lead(II) sorption on the sorbents in these conditions were determined. The highest Kd values, more than 1000 cm3źg-1, were obtained for composite sorbents CuNCFM from HCl, HNO3 and H2SO4 (range concentration 10-4-10-2) and for CuNCF and NiNCF from HCl (range concentration 10-4-10-2). Also, the lead(II) sorption on the magnetite-loaded resin was performed.

5

Radionuclides 137Cs and 40K in the soils of the Tatra National Park (TPN, Poland)

Kubica B., Skiba S., Drewnik M., Stobiński M., Kubica M., Gołaś J., Misiak R.

Nukleonika

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2010

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Vol. 55, No. 3

377-386

EN

The paper presents the results of radioactivity determination of artificial 137Cs and natural 40K in soil samples taken from the Tatra Mountains in Poland (Tatra National Park – TPN). Soil samples were collected as the cores of 10 cm in diameter and 10 cm in depth. These cores were divided into 3 slices. It has been found that the content of 137Cs was the highest at the sites of the altitude over 1300 m a.s.l. The values of 137Cs concentration in the soils examined varied – from 55.8 Bqźkg–1 (dry mass) (417.8 Bqźm–2) for the Tomanowa Pass (1685 m a.s.l.) to 5111 Bqźkg–1 (dry mass) (8400 Bqźm–2) for the Krzyzne Pass (2112 m a.s.l.). In most cases, the values were lower than the average radiocaesium concentration established for Poland.

6

Can interval computations be applied over spaces of non-numbers?

Kubica B.

Prace Naukowe Politechniki Warszawskiej. Elektronika

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2008

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z. 165

103-112

EN

Interval methods proved to be a useful tool for solving global optimization and nonlinear equations systems problems over Rn. But an interval may be defined not only over the set of real numbers or real vectors, but over any partially ordered set. The paper shows how basic ideas of interval computations can be generalized for such spaces. Some specific applications are proposed and preliminary computational results are presented.

7

CuikSLAM with unknown correspondence - preliminary results

Kubica B., Szynkiewicz W.

Prace Naukowe Politechniki Warszawskiej. Elektronika

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2007

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z. 160

143-151

EN

This paper considers the problem of simultaneous localization and mapping of a mobile robot. The kinematic approach of CuikSLAM is adopted applying constrained satisfaction and interval methods. The novelty is that we do not assume the landmark identification problem to br solved.

8

Litostratygrafia i litofacje mioceńskich osadów podgipsowych morawianu w północnej części zapadliska przedkarpackiego

Kubica B.

Biuletyn Państwowego Instytutu Geologicznego

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2004

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nr 407

5-28

PL

W artykule omówiono i przedyskutowano zróżnicowania litofacjalne utworów mioceńskich występujących poniżej poziomu gipsowego północnej części zapadliska przedkarpackiego. W szczególności rozważono zagadnienia litostratygrafii oraz przedstawiono rozwój sedymentacji osadów podgipsowych Morawianu, stanowiących podłoże dla depozycji ewaporatów i mających pośredni związek z procesami siarkotwórczymi.

EN

A lithofacies differentiation of Miocene deposits occurring below a gypsum horizon in the northern part of the Carpathian Foredeep are described and discussed. In particular, problems of lithostratigraphy and sedimentation of the Moravian sub-gypsum beds are considered. These beds were the bedrock for evaporitic sedimentation and were indirectly associated with sulphur concentrations.

9

Unconstrained and constrained global optimization using interval analysis

Kubica B., Niewiadomska-Szynkiewicz E.

Prace Naukowe Politechniki Warszawskiej. Elektronika

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2002

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z. 139

185--199

EN

This chapter presents techniques adressed to continuous, unconstrained and constrained optimization problems. Global optimization is defined as the problem of finding points on a bounded subset of X of Rn in which some real valued function f reaches its optimal (minimum or maximum) value. The algorithms considered are based on the branch-and-bound principles where the problem domain is partitioned iteratively. They apply interval arithmetic tools. The main objective is to discuss the advantages and disadvantages of existing algorithms and to provide some modifications for increasing their efficiency. The numerical results for several test problems are presented in the final part of the chapter.