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Akademicki Informator Osób z Niepełnosprawnościami, nr 001(20)/2025 (wiosna)
No full textRedaktor: Małgorzata ŚwitSekretarz redakcji: Alicja Czyżniak, Piotr ZającWspółpraca: I. Boguszyńska, A. Derlukiewicz, M. Jarczyńska, A. Kiełkowska, J. Klimczak, J. Kopańska, Ł. Kowalczyk, K. Król, A. Majnusz, R. Nykiel, V. Paskarenko, W. Pawłowski, A. Rodak, R. Roczeń, P. Sękalski, M. TraczSkład i łamanie: SmartDTP.plProjekt graficzny: Aleksandra IdzikowskaZdjęcie na okładce: Roman Świt
SmartDTP.plRedakcja zastrzega sobie prawo do skrótów i opracowań nadesłanych tekstów.Publikacje nie są stanowiskiem Politechniki Łódzkiej, odzwierciedlają wyłącznie poglądy i opinie autorów tekstów.Projekt dofinansowany ze środków Fundacji Politechniki Łódzkie
Avior Of The Double-Span Prestressed Steel Reinforced Concrete Beams
No full textThe article deals with double-span, double composite beams, in which prestressed
concrete is connected to a specially prepared rigid steel profile and
in which their interaction with monolithic concrete is assumed. The paper
describes the behavior of multi-span elements under loading, defines the
term of plastic hinges in composite prestressed structures and explains the
phenomenon of internal force redistribution. These issues are discussed
in relation to the authors' own research. A computational analysis is then
carried out, in which a nonlinear layer model of cross-section is formulated,
based on the elastic-plastic characteristic of the materials used. The results
show that there exists the local redistribution in tested elements, despite
the discontinuity of the part of reinforcement in the middle-span zone. The
degree of this interaction depends on the amount of reinforcement in the
support section, the proper anchorage of that reinforcement and sufficient
bond between the reinforcement and the concrete
Assessments of sustainable chemicals and bioenergy potentials of selected lignocellulosic biomass feedstocks in Poland via physicochemical characterisation and pyrolysis
No full textThe varied physicochemical properties of biomass feedstocks influence their behaviour during thermochemical conversion to produce carbon-based fuels and chemicals. In this study, five common Poland-based lignocellulosic biomass feedstocks - oxytree trimmings, pinewood sawdust, vegetal sorghum, coffee waste, and mixed forestry residues were selected for detailed characterisation and intermediate pyrolysis to assess their sustainable chemicals and bioenergy potentials. Proximate analysis showed volatile matter contents ranging from 67.9 wt% (forestry residues) to 79.4 wt% (pinewood), with fixed carbon showing the opposite trend. Intermediate pyrolysis was conducted between 400 and 600 °C in a fixed-bed reactor using fast heating rates (200–300 °C/s) and a vapour residence time of ∼2.2 min. Gas yields increased with temperature, while liquid and biochar yields decreased. Pinewood gave the highest gas yield across all temperatures, reaching 26.9 wt% at 600 °C, while forestry residues yielded the most solid products (40.6 wt% at 400 °C). Thermogravimetric analyses of the feedstocks and their biochars showed progressive devolatilisation and increasing fixed carbon, reaching 80.8 wt% for pinewood biochar at 600 °C. Liquid yields followed the trend: coffee waste > pinewood > oxytree > forestry residues > sorghum. Woody biomass gave biochars with high fixed carbon and thermal stability, suitable for carbon sequestration, soil enhancement, or use as solid fuels. Coffee waste produced nitrogen-rich biochar with potential for fertiliser use, and fatty acid-rich oils suitable for biofuel upgrading. Phenol- and sugar-rich liquids from woody feedstocks have potential uses in resins, biochemicals, and fermentation. These results support tailored pyrolysis strategies to enable the strategic valorisation of Poland's biomass resources.This work was founded from the BioTrainValue Project (BIOmass Valorisation via Superheated Steam Torrefaction, Pyrolysis, Gasification Amplified by Multidisciplinary researchers TRAINing for Multiple Energy and Products’ Added VALUEs), with project number: 101086411, funded under Horizon Europe’s Marie Skłodowska-Curie Staff Exchange program
