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Number of results: 9
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Abstract

Celem pracy było określenie wpływu hydraulicznego czasu zatrzymania (H RT) i wydajności cyrkulacji wewnętrznej (Gel na różnorodność mikroorganizmów w biomasie unieruchomionej w porowatym nośniku ceramicznym. Bioreaktor, wykorzystywany do usuwania związków organicznych ze ścieków komunalnych, był eksploatowany przy HRT 70 i 60 min oraz qc w zakresie 20-70 drn"h'. Różnorodność mikroorganizmów była określana na podstawie wzorów RISA przy użyciu indeksu Shannona-Wienera (1-1'). Przy HRT równym 70 min, H' obniżył się z 2,48 ± 0,14 do 2,13 ± 0,23 ze wzrostem Ge z 20 do 60 drn+h'. Przy HRT 60 min. zwiększenie qc z 40 do 70 drnvh' spowodowało spadek 1-1' z 2,41 ± O, 13 do 2,08 ± O, 19. Przy każdej wartości HRT, najwyższą efektywność usuwania związków organicznych uzyskano przy najniższej wartości qc i najwyższej bioróżnorodności.
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Authors and Affiliations

Magdalena Zielińska
Agnieszka Cydzik-Kwiatkowska
Irena Wojnowska-Baryła
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Abstract

Odpady pogalwaniczne zaliczane są do odpadów niebezpiecznych. dlatego muszą być unieszkodliwiane. Jedną z najprostszych metod unieszkodliwiania jest zestalanie w spoiwach mineralnych. W niniejszej pracy przeprowadzono próby zestalania w zaprawie cementowej oraz w zaprawie cementowej z dodatkiem pyłów krzemionkowych odpadu powstałego po neutralizacji zużytych kąpieli do trawienia, rozcieńczonych wodami poplucznymi, pochodzącymi z procesu cynkowania oraz miedziowania drutu. Badania wykazały, że dodatek odpadów w ilości do 5% jest bezpieczny pod względem ekologicznym. Przy takiej ilości dodatku odpadów do cementu następuje nieznaczne obniżenie parametrów fizykomechanicznych, a metale są trwale irnmobilizowane w matrycy. Dodatek pyłów krzemionkowych w ilości 10% do cementu poprawiał cechy wytrzymałościowe wyrobów, ale wprowadzenie odpadów obniżało te parametry.
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Authors and Affiliations

Małgorzata Osińska
Agnieszka Ślosarczyk
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Abstract

Essential sorts of disinfecting agents and principles of their action have been considered in the paper. Results of research on application of washing-disinfecting liquids, containing silver nano-particles, in meat industry have been presented. It has been established that liquids characterized by very efficient bactericidal and fungicidal properties can be prepared by composition of toxieal ly performing silver nano-particles, some degreasing agents, reducing surface tension, and frothing agents. The listed components eliminate "insulating effect" of fat particles in which bacteria are suspended and facilitate silver nano-particle contact with bacteria and fungi, increasing this way biochemical effect of silver nano-particles.
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Authors and Affiliations

Michał Konopka
Zygmunt Kowalski
Zbigniew Wzorek
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Abstract

Research concerning chemical constitution of alluvial sediments was done in the lower course of the Obra River (Western Poland). The fragment of vertical profile, which consisted of various alluvial sediments (fine sands, peats and sandy silts) was chosen lor detailed analysis. Main research problem was to determine if lithology and chemical constitution or alluvial deposits arc interconnected in a distinct way within studied section of' the Obra river valley, and if changes of chemical clements concentration could be used to i I lustratc depositional processes which take place in river bed and floodplain. Concentrations ofFe, Mn, Cu, Zn, Ca, Mg and K were determined in collected sediment samples. Investigated changes of chemical clements concentration show that there is a distinct border between the organic sediments, which mark the place of former functioning of the Obra river bed, and sandy silts, which were deposited within floodplain during floods. Besides, dependence between lithologic variability of alluvial sediments and their chemical constitution was observed. However, this dependence is not clear in some cases. The authors concluded that it is necessary to use statistic analyses to define connection between lithology and chemical constitution or alluvial deposits (distinguishing geochemical groups of alluvial sediments).
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Authors and Affiliations

Marcin Słowik
Tadeusz Sobczyński
Zygmunt Młynarczyk
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Abstract

The aim of this study was to examine the possibility of use of synchronous culture of Chlorella vulgaris algae as a biotest in water quality control. In the experiment the samples of water collected from seven sampling points in Goczałkowice Reservoir were used. The criterion of changes was the concentration of photosynthetic pigments, from 24'" hour of the cell life cycle, separated by HPLC technique. On the basis of changes taking place in the cells of the algae cultures it was possible to establish the timing of the flood period and autumnal changes in a water quality. It was also proved that the water quality in the main water current that fall into the western part of reservoir carried by the Wisła River after the flood period significantly differed from the water quality in the other parts of the reservoir, particularly in its eastern section.
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Authors and Affiliations

Anna Czaplicka-Kotas
Joanna Lodowska
Adam Wilczok
Zbigniew Ślusarczyk
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Abstract

Zanieczyszczenia przemysłowe przyczyniają się z reguły do poglębicnia degradacji rolniczej przestrzeni produkcyjnej, prowadząc między innymi do nagromadzenia metali ciężkich w glebie. Do grupy metali ciężkichzaliczany jest nikiel, który w małych ilościach jest niezbędny dla wzrostu i rozwoju organizmów żywych, natomiast występujący w nadmiarze jest toksyczny. W czteroletnim doświadczeniu wazonowym badano wpływ zanieczyszczenia gleby niklem (50, I 00 i 150 mg Ni/kg gleby zastosowanego w formie NiSO,711,O) na tic zróżnicowanego wapnowania (wg 0,5; I i 1.5 Hh gleby zastosowanego w formie CaCO) na zawartość Pb i Mn w koniczynie czerwonej. Zawartość metali oznaczono metodą ICP-J\ES po wcześniejszej mineralizacji materiału roślinnego ,,na sucho" w piecu muflowym w temperaturze 450°C i rozpuszczeniu popiołu w I 0% roztworze HCL. Wyniki badań opracowano statystycznie analizą wariancji z wykorzystaniem rozkładu F-FisheraSnedecora wg programu F.R. Anal.var 4.1., a wartość NIR.,5 wyliczono wg testu Tukeya. W celu znalezienia związków między badanymi cechami w pracy przeprowadzono również analizę korelacji liniowej. Zawartość obu metali w roślinach uprawianych na glebach zanieczyszczonych niklem była większa w odniesieniu do roślin uprawianych na glebach niezanieczyszczonych, co może świadczyć o synergizmie niklu i omawianych metali. Zastosowane wapniowanie (niezależnie od ilości CaCO, wprowadzonego do gleby) powodowało istotne zmniejszenie zawartości obu metali w roślinie testowej. Przeprowadzone badania wykazały synergistyczne zależności pomiędzy niklem a ołowiem i manganem.
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Authors and Affiliations

Beata Kuziemska
Stanisław Kalembasa
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Abstract

Research concerning changes or chosen chemical elements concentration in alluvial sediments was conducted in the lower course or the Obra river valley. The analyses of Fe, Mn, Cu, Zn, Ca, Mg and K concentration were done in a fragment or vertical profile, which was characterized by variable lithology. On the basis of statistical analysis (cluster analysis) an attempt was made to distinguish geochemical groups of alluvial sediments of the Obra river valley. Six geochemical groups, which represent reductive conditions within peat deposits, the environment ofllood sediments (inserts of fine sands within peats and sandy silts in the top of the profile) and the environment or river bed sediments (fine sands in the bottom part ofthe profile), were singled out. Results of the study show that it is possible to distinguish the above mentioned depositional environments on the basis of variations of sediments' chemical constitution.
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Authors and Affiliations

Marcin Słowik
Tadeusz Sobczyński
Zygmunt Młynarczyk
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Abstract

Seasonal changes in the numbers of sulphate-reducing bacteria in water, soil, the surface of sedge (Carex acutiformis Ehrb.) immersed in waler and roots (dead and live) were studied. The study on one of larger wetland near Olsztyn (Masurian Lake District) was carried out in two annual cycles. Sulphate-reducing bacteria in the studied ecosystems occurred sporadically and generally in inappreciable count. Their count did not exceed 20 cells in I cm3 ofwaler; in the soil and in di ffercnt parts of sedge the number of bacteria ranged from several lo over dozen thousands cells in I g of dry weight. In the first year of studies these bacteria were the most numerous in June, July and during first days of December, bul in the second - in April (in soil and sedge immersed in water), in August (in soil and dead and live roots), in November (in waler, soil, sedge immersed in water and dead roots) and exceptionally in other months.
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Authors and Affiliations

Stanisław Niewolak
Renata Brzozowska
Karolina Czechowska
Zofia Filipkowska
Ewa Korzeniewska
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Abstract

An indoor localization system is proposed based on visible light communications, received signal strength, and machine learning algorithms. To acquire an accurate localization system, first, a dataset is collected. The dataset is then used with various machine learning algorithms for training purpose. Several evaluation metrics are used to estimate the robustness of the proposed system. Specifically, authors’ evaluation parameters are based on training time, testing time, classification accuracy, area under curve, F1-score, precision, recall, logloss, and specificity. It turned out that the proposed system is featured with high accuracy. The authors are able to achieve 99.5% for area under curve, 99.4% for classification accuracy, precision, F1, and recall. The logloss and precision are 4% and 99.7%, respectively. Moreover, root mean square error is used as an additional performance evaluation averaged to 0.136 cm.
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Authors and Affiliations

Alzahraa M. Ghonim
1
Wessam M. Salama
2
Ashraf A. M. Khalaf
1
ORCID: ORCID
Hossam M. H. Shalaby
3 4

  1. Department of Electrical Engineering, Faculty of Engineering, Minia University, Minia 61111, Egypt
  2. Department of Basic Science, Faculty of Engineering, Pharos University, Alexandria, Egypt
  3. Electrical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
  4. Department of Electronics and Communications Engineering, Egypt-Japan University of Science and Technology (E-JUST), Alexandria 21934, Egypt

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