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Number of results: 6
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Abstract

Demonstrating the impact of time-dependent ground adsorption capacity on the change in chemical composition of groundwater is an important issue in understanding the groundwater mass transport process. Commonly used parameters characterizing ground adsorption capacity (Ra, ��xu = ux/Ra, Δ ������ C�� ) were analyzed in this work to demonstrate time-varying values of this capacity for a chosen type of ground. Analysis of values of the selected parameters showed a gradual time decline in ground adsorption capacity as well as a gradual increase of groundwater contamination. This gradual increase in groundwater contamination over time is also important in practice. It implies the necessity to use more and more advanced (expensive) methods of water treatment in groundwater intakes.

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Authors and Affiliations

Andrzej Aniszewski
1

  1. West Pomeranian University of Technology in Szczecin, Poland
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Abstract

A series of steps taken to determine a kinetic equation that describes hydrogenation of propene on nickel catalyst is presented in this study. Mixed factorial design approach, belongs to designing of experiments methods was used to plane experiments. The investigations showed that the method applied makes possible determination of the kinetic equation in a relatively fast and cheap manner since only a few measurement points is required. The equation obtained was verified experimentally and statistically. Both tests showed satisfactory precision of anticipated values of the process rate.
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Bibliography

Aaserud C., Hilmen A.-M., Bergene E.S.E., Schanke D., Holmena A., 2004. Hydrogenation of propene on cobalt Fischer–Tropsch catalysts. Catal. Lett., 94, 171–176. DOI: 10.1023/B:CATL.0000020541.28174.c7.
Ahmadigoltapeh, S., Mehranbod, N., Halimejani, H.Z., 2015. Propylene hydrogenation through structured and con- ventional catalyst beds: Experiment and modelling. J. Nat. Gas Sci. Eng., 27, 822–830. DOI: 10.1016/j.jngse.2015.09.030.
Brandao L., Fritsch D., Madeira LM., Mendes A.M., 2004. Kinetics of propylene hydrogenation on nanostructured palladium clusters. Chem. Eng. J., 103, 89–97. DOI: 10.1016/j.cej.2004.07.008.
Carturan G., Enzo S., Ganzerla R., Lenarda M., Zanoni R., 1990. Role of solid-state structure in propene hydro- genation with nickel catalysts. J. Chem. Soc. Faraday Trans., 86, 739–746. DOI: 10.1039/ft9908600739.
Esfe M.H.,. Rsotamian H, Shabani-Samghabadi A., Arani A.A.A., 2017. Application of three-level general fac- torial design approach for thermal conductivity of MgO/ water nanofluids. Appl. Therm. Eng., 127, 1194–1199. DOI: 10.1016/j.applthermaleng.2017.07.211.
Montgomery D.C., 2017. Design and analysis of experiments. 9th ed., Wiley.
Özbay N., Yargıç A.Ş., Yarbay-Şahin R.Z., Önal E., 2013. Full factorial experimental design analysis of reactive dye removal by carbon adsorption. J. Chem., 234904. DOI: 10.1155/2013/234904.
Pachulski A., Schödel R., Claus P., 2012. Kinetics and reactor modeling of a Pd-Ag/Al2O3 catalyst during selective hydrogenation of ethyne. Appl. Catal., A, 445–446, 107–120. DOI: 10.1016/j.apcata.2012.08.018.
Schweitzer NM., Hu B., Das U., Hacksung K., Greeley J., Curtiss L.A., Stair P.C., Miller J.T., Hock A.S., 2014. Propylene hydrogenation and propane dehydrogenation by a single-site Zn2+ on silica catalyst. ACS Catal., 4, 1091–1098. DOI: 10.1021/cs401116p.
Sen G.A., 2016. Application of full factorial experimental design and response surface methodology for chromite beneficiation by Knelson concentrator. Minerals, 6, 5. DOI: 10.3390/min6010005.
Szukiewicz M., Chmiel-Szukiewicz E., Kaczmarski K., Szałek A., 2019. Dead zone for hydrogenation of propylene atalyst pellets. Open Chem., 17, 295–301. DOI: 10.1515/chem-2019-0037.
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Authors and Affiliations

Adrian Szałek
1
Mirosław Szukiewicz
1
Elżbieta Chmiel-Szukiewicz
1

  1. Rzeszów University of Technology, Faculty of Chemistry, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland
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Abstract

Software vulnerability life cycles illustrate changes in detection processes of software vulnerabilities during using computer systems. Unfortunately, the detection can be made by cyber-adversaries and a discovered software vulnerability may be consequently exploited for their own purpose. The vulnerability may be exploited by cyber-criminals at any time while it is not patched. Cyber-attacks on organizations by exploring vulnerabilities are usually conducted through the processes divided into many stages. These cyber-attack processes in literature are called cyber-attack live cycles or cyber kill chains. The both type of cycles have their research reflection in literature but so far, they have been separately considered and modeled. This work addresses this deficiency by proposing a Markov model which combine a cyber-attack life cycle with an idea of software vulnerability life cycles. For modeling is applied homogeneous continuous time Markov chain theory.
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Authors and Affiliations

Romuald Hoffmann
1

  1. Institute of Computer and Information Systems, Faculty of Cybernetics, Military University of Technology, Warsaw, Poland
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Abstract

Suberoylanilide hydroxamic acid (SAHA) is a histone deacetylase inhibitor (HDACi) that suppresses the growth of tumor cells in humans and canines. SAHA reportedly enhances the antitumor activity of human peripheral blood mononuclear cell (PBMC). However, it is unclear whether a similar effect is exerted in canines. The present study focused on the effect of SAHA on the cytotoxicity of IL-2 activated PBMC in three tumor cell lines (CTAC, CIPm, and MCM-N1). The mRNA expression of a ligand for the NKG2D receptor was upregulated in SAHA-treated cell lines. Moreover, the SAHA-treated cell lines, except MCM-N1 demonstrated a significantly higher PBMC cytotoxicity compared to the untreated cell lines. Therefore, the NKG2DL upregulation likely enhanced the interaction of NKG2D-NKG2DL, leading to enhanced cytotoxicity of PBMC. It was also revealed that activated PBMC treated with SAHA significantly attenuated their cytotoxicity toward all the cell lines. Although the NKG2D, NKp46, NKp44, and NKp30 receptors, involved in PBMC cytotoxicity, were presumed to be downregulated, there was no significant reduction in the mRNA expression of these receptors. This study revealed that SAHA not only sensitizes the canine tumor cells to cytotoxicity due to PBMC activation, but also suppresses the cytotoxicity of PBMC themselves. Therefore, our results highlight the necessity of avoiding this inhibitory action to enhance the antitumor effect of SAHA in canines.
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Authors and Affiliations

T. Oyamada
1 2
S. Okano
2

  1. Animal Medical Center, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8, Saiwai, Fuchu, Tokyo, 183-8509, Japan
  2. Department of Small Animal Surgery 2, School of Veterinary Medicine, Kitasato University, Higashi 23-35-1, Towada, Aomori, 034-8628, Japan
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Abstract

The interglacial deposits at Zbójno near Radoszyce (central Poland) was drilled again and reinvestigated by means of pollen analysis. The pollen succession, partly recorded in subaerial sediments with many stratigraphic gaps, treated hitherto as the stratotype of Zbójnian interglacial, does not seem to differ from the Eemian sequence, and may actually be of the Eemian age. This strongly suggests that the term "Zbójno" should be removed from the Polish Pleistocene stratigraphy.

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Authors and Affiliations

Krzysztof Bińka

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