Repozytorium ZUT

Repozytorium ZUT jest cyfrową usługą, która gromadzi, przechowuje i udostępnia materiały cyfrowe utworzone przez społeczność akademicką Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie




 

Najnowsze publikacje

PozycjaOpen Access
Influence of Potassium-Based Activation on Adsorptive Properties of Carbon SpheresModified with Iron(III) Citrate
(MDPI, 2023-07-25) Pełech, Iwona; Sibera, Daniel; Staciwa, Piotr; Sobczuk, Konrad S.; Narkiewicz, Urszula; West Pomeranian University of Technology in Szczecin, Department of Inorganic Chemical Technology and Environmental Engineering, 70-322 Szczecin, ul Pułaskiego 10, Poland; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Nieorganicznej i Inżynierii Środowiska.; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska.
Composites synthesized from iron(III) citrate and carbon spheres, and activated with potassium compounds were prepared and then characterized using XRD, SEM, and low-temperature nitrogen adsorption methods. The adsorption properties of the composites toward carbon dioxide were assessed using CO2 uptake measurement, as well as by measuring their selectivity toward carbon dioxide, given their further application as photocatalysts for the reduction of this gas. The effect of changing preparation conditions on the structural and adsorption properties of the material was assessed. The potential strength of such material is a synergistic effect between the high adsorption capacity related to the microporosity of carbon spheres combined with the catalytic properties of iron particles.
PozycjaBrak dostępu
Influence of the calcination of TiO2-reduced graphite hybrid for the photocatalytic reduction of carbon dioxide
(Elsevier, 2021-06-09) Morawski, Antoni W.; Kusiak-Nejman, Ewelina; Wanag, Agnieszka; Narkiewicz, Urszula; Edelmannova, Miroslava; Reli, Martin; Koci, Kamila; West Pomeranian University of Technology in Szczecin, Department of Inorganic Chemical Technology and Environmental Engineering, 70-322 Szczecin, ul Pułaskiego 10, Poland; Institute of Environmental Technology, CEET, VˇSB – Technical University of Ostrava, 17. listopadu 15/2172, Ostrava, Czech Republic; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Technologii i Inżynierii Chemicznej. Katedra Technologii Chemicznej Nieorganicznej i Inżynierii Środowiska.; Technical University of Ostrava. Institute of Environmental Technology, CEET.
In this work, a conversion of carbon dioxide (CO2) into methane, carbon monoxide, as well as hydrogen was investigated. The TiO2/rGO photocatalysts were prepared by two steps: solvothermal method and calcination at 500, 800, and 1000 ◦C in an argon atmosphere. The obtained samples were characterized by X-ray diffraction (XRD), UV–vis diffuse reflection spectroscopy (UV–vis/DRS), N2 adsorption-desorption and analysis of carbon content. The activity of photocatalysts was evaluated in the photocatalytic reduction of CO2. The TiO2/rGO-10 without calcination showed the highest activity toward CO2 conversion. It was found that all samples after rGO modification exhibited good activity toward H2 generation with high selectivity. The enhanced photocatalytic performance was attributed mainly to the presence of graphene due to its excellent electron transport/collection ability.
PozycjaOpen Access
Bibliografia publikacji pracowników Akademii Rolniczej w Szczecinie za rok 2002
(Wydawnictwo Akademii Rolniczej w Szczecinie, 2003) Jankowska, Elżbieta opracowała; Akademia Rolnicza w Szczecinie
PozycjaOpen Access
Wpływ rodzaju zbrojenia rozproszonego na właściwości kompozytów cementowych do druku 3D
(Zachodniopomorski Uniwersytet Technologiczny w Szczecinie, 2023) Techman, Mateusz; Kaszyńska, Maria promotor; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydział Budownictwa i Inżynierii Środowiska
PozycjaOpen Access
Data-Based Estimation of Parameters for Time-Inhomogeneous CTMC Birth-and-Death of Call Centers
(EUROSIS-ETI, 2023-10-24) Burak, Maciej, Rafał; West Pomeranian University of Technology in Szczecin, Poland
In this paper, we present a novel approach to estimate parameters of a queuing model using real call center data. Our approach leverages the transient solution of an inhomogeneous continuous-time Markov chain (CTMC) queuing model emulating the behavior of the genuine system. Specifically, to assess the fidelity of our modeling approach, we use an example of approximating the real call center system with an inhomogeneous M(n)/M/c/K + M CTMC model. To do this, we utilize authentic call center data for replicating the behavior of the real system through our model. In particular, the model incorporates the true time-dependent rates for the arrival process, service rates, and the number of available servers. Our analysis focuses on assessing the accuracy of the Markovian assumptions made for modeling customer abandonment during waiting periods. Furthermore, we investigate the performance of our model under two distinct scenarios: overloaded systems and systems operating in a quality-driven mode. By examining these cases, we ascertain the effectiveness of our assumptions in accurately representing the behavior of the call center. Finally, we demonstrate the practical application of our findings by showcasing how a simple and computationally efficient M(n)/M/c/K+M Markovian approximation of a real call center can be used for accurate personnel planning while adhering to service-level constraints.