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Wyszukujesz frazę "Nowak, M.K." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Using a multicriteria interactive approach in scheduling non-critical activities
Autorzy:
Nowak, M.
Targiel, K. S.
Powiązania:
https://bibliotekanauki.pl/articles/406399.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
project scheduling
trade-offs
interactive approach
CRR binomial method
planowanie projektu
podejście interaktywne
CRR
Opis:
A typical project consists of many activities. Logical dependencies cause some of them to be critical and some non-critical. While critical activities have a strict start time, in some projects the problem of selecting the start time of a non-critical activity may arise. Usually, it is possible to use the “as soon as possible” or “as late as possible” rules. Sometimes, however, the result of such a decision depends on external factors, e.g., an exchange rate. In this paper, we consider the multi-criteria problem of determining the start time of a non-critical activity. We assume that the earliest start and the latest start times of the activity have been identified using the critical path method, but the project manager is free to select the time when the activity will actually be started. This decision, however, cannot be changed later, as it is associated with the allocation of key resources. The criteria that are usually considered in such a situation are cost and risk. We assume that the cost depends on an exchange rate. We also consider the risks of project delay and a decrease in quality. This paper formulates the selection of the start time for a non-critical activity as a discrete dynamic multicriteria problem. We solve it using an interactive procedure based on the analysis of trade-offs.
Źródło:
Operations Research and Decisions; 2018, 28, 1; 43-56
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of fluoride ions by ultrafiltration in the presence of cationic surfactants
Autorzy:
Klimonda, A.
Grzegorzek, M.
Majewska-Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/208133.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultrafiltration
fluoride ions
surfactant
membrane
ultrafiltracja
jony fluorkowe
fluor
surfaktanty
membrany
Opis:
The usability of surfactant-aided ultrafiltration for removal of fluoride ions from aqueous solutions has been investigated. The experiments were conducted with the use of cellulose and polyethersulfone membranes. Fluoride solutions containing 10 and 100 mg F/dm3 and cationic surfactants: octadecylamine acetate (ODA) and hexadecylpyridium chloride (CPC) were used in the experiments. The concentration of surfactants amounted to 320–960 mg/dm3. Ultrafiltration process was run under a trans-membrane pressure of 0.2 MPa. In the course of experiments, the effects of initial fluoride concentration, surfactant concentration and membrane type on the fluoride retention coefficient as well as the permeate flux were studied. It was found that the increase of the surfactant concentration effected in improvement of the separation efficiency. On contrary, the permeate flux decreased upon increase of the surfactant concentration. The process efficiency was also strongly influenced by the membrane and surfactant type. The permissible concentration of fluoride in the final product (below 1.5 mg F/dm3) was obtained for the test with initial solutions containing 10 mg F/dm3, polyethersulfone membrane and CPC con-centration equal to 644 and 966 mg/dm3.
Źródło:
Environment Protection Engineering; 2017, 43, 2; 5-13
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of fluoride ions by batch electrodialysis
Autorzy:
Majewska-Nowak, K.
Grzegorzek, M.
Kabsch-Korbutowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/207831.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorine compounds
biological materials
electrodialysis
fluoride concentrations
fluoride removal
związki fluoru
materiały biologiczne
elektrodializa
stężenie fluorków
usuwanie fluorków
Opis:
Suitability of conventional batch electrodialysis to fluoride removal from aqueous solutions has been investigated. The experiments were conducted with the use of laboratory installation PCCell BED-1 System at a constant current density (1.56 or 2.34 mA/cm2). The influence of initial fluoride and salt (NaCl) concentration, as well as the presence of organic matter on the process performance was studied. It was found that the separation efficiency increased upon decrease of initial fluoride content in model solutions. Permissible final concentration of fluorides in the product water (1.5 mg/dm3) was obtained for experiments with solutions of initial fluoride concentration equal to 5 mg F–/dm3 and 10 mg F–/dm3. The presence of humic acids in fluoride solutions subjected to electrodialysis treatment has no adverse effect on the defluorization and desalination efficiency. The calculated electrical energy demand depended on composition of fluoride solution and varied from 0.121 to 0.895 kWh/m3.
Źródło:
Environment Protection Engineering; 2015, 41, 1; 67-81
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of modification with cetylpyridinium chloride – a potential cariogenic microflora inhibitor, on selected physical-mechanical properties of the water-activated glass-ionomer
Autorzy:
Kupka, T.
Nowak, J.
Szczesio, A.
Kopacz, K.
Fronczek-Wojciechowska, M.
Sokolowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/307009.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
twardość
wytrzymałość na rozciąganie
szkło
hardness
diametral tensile strength
glass-ionomer
Opis:
Teeth caries is one of predominant civilization diseases. Dental fillings with antimicrobial addition might allow prevention of secondary caries. The purpose of this study was to evaluate hardness and tensile strength of cetylpyridinium chloride modified water activated glass-ionomer cement. Methods: Samples with diameter of 6 mm and height of 3 mm made of water-activated glass-ionomer cement were control group (0.0%). Test groups were series of samples of the same dimensions, with addition of cetylpyridinium chloride antibacterial in concentrations of 0.5, 1.0, 1.5 and 2.0%. Two subgroups were prepared in each group to determine Vickers Hardness and Diametral Tensile Strength after 1 and 24 hours of sample storage in distilled water. Results: During hardness studies, no strong effect of antibacterial concentration on hardness of samples was observed. Higher hardness values after 24 hours were demonstrated for all groups, compared to the samples tested after 1 hour. The exception was the group with the addition of 1% cetylpyridinium chloride, in which no statistically significant differences were observed. Diametral Tensile Strength values for samples tested after 1 hour decreased with increasing antibacterial concentration. A similar relationship was noticed for samples tested after 24 hours. No statistically significant differences were found between test samples after 1 or 24 hours. Conclusions: There was no significant effect of cetylpyridinium chloride concentration on the hardness of the samples that significantly increased during the study. With the increase in antibacterial concentration a decrease in diametral tensile strength value was observed, but these values did not change over time.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 3; 19-24
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected nonapeptides in terahertz light
Autorzy:
Fuglewicz, B.
Pliński, E. F.
Jarząb, P. P.
Plińska, S.
Cebrat, M.
Nowak, K.
Augustyn, L.
Walczakowski, M. J.
Mikulics, M.
Pałka, N.
Szustakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/173420.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
terahertz spectroscopy
peptides
oxytocin
vasopressin
derivatives
Opis:
Eight synthetic histidine analogues of oxytocin and vasopressin are subject of investigations. The spectra of the peptides have been investigated in the terahertz band. The results are obtained in the terahertz time-domain spectroscopy arrangement.
Źródło:
Optica Applicata; 2014, 44, 1; 159-171
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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