Witamy w Repozytorium PŁ

Repozytorium Politechniki Łódzkiej gromadzi, archiwizuje oraz udostępnia w postaci pełnotekstowej dorobek naukowy pracowników PŁ.

Repozytorium zawiera przede wszystkim artykuły naukowe, książki, monografie, materiały konferencyjne oraz referaty, powstałe jako wynik procesów badawczych i dydaktycznych prowadzonych przez Politechnikę Łódzką.

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Najnowsze publikacje

  • Item type:Pozycja,
    Assessments of sustainable chemicals and bioenergy potentials of selected lignocellulosic biomass feedstocks in Poland via physicochemical characterisation and pyrolysis
    (Elsevier, 2025) Mohammad, Omar; Khan, Muhammad; Unyay, Hilal; Ślężak, Radosław; Szufa, Szymon; Onwudili, Jude A.
    The 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.
  • Item type:Pozycja,
    Znaczenie jakości w gospodarce o obiegu zamkniętym
    (Wydawnictwo Politechniki Łódzkiej, 2025) Haręża, Paweł; Zarębska, Joanna (Rec.); Melski, Krzysztof (Rec.)
    (...) Celem publikacji jest ukazanie, w jaki sposób współczesna nauka o jakości może wspierać transformację gospodarki w kierunku gospodarki o obiegu zamkniętym oraz jak jakość, rozumiana w sposób wielowymiarowy, staje się punktem wyjścia do projektowania, zarządzania i oceny nowoczesnych produktów w warunkach transformacji ekologicznej. Monografia adresowana jest zarówno do środowiska naukowego, jak i praktyków zajmujących się zarządzaniem jakością, projektantów, przedsiębiorców oraz decydentów politycznych poszukujących usystematyzowanego spojrzenia na jakość w kontekście gospodarki o obiegu zamkniętym.
  • Item type:Pozycja,
    Activity of compounds of natural origin against Alicyclobacillus acidoterrestris, a common fruit juices contaminant
    (Lodz University of Technology Press, 2015) Tyfa, Agnieszka; Kunicka-Styczyńska, Alina; Dąbrowska, Justyna
    Fruit product industry struggles with emerging problem of microbial contamination with Alicyclobacillus acidoterrestris. This acidothermophilic, soil-borne and sporeforming bacterium posses ability to survive commercial pasteurization and thus may cause fruit juices spoilage. Even modern technologies are not effective enough to eliminate A. acidoterrestris from the industrial environments. The green consumer attitude and safety standards suggest adaptation of natural and safe solutions. This paper summarizes the bioactivity of compounds of natural origin which could serve as anti-alicyclobacilli preservation agents maintaining stability of fruit juices.
  • Item type:Pozycja,
    Impact of rearing system of Rosa breed laying hens on occurrence and antibiotic resistance of Salmonella spp. isolated from egg shell surface
    (Lodz University of Technology Press, 2015) Galbas, Mariola; Selwet, Marek; Koczorowski, Michał; Porzucek, Filip
    Salmonelloses are among the most common animal-borne infections. The most frequent causes of their occurrence are contaminated chicken eggs. For this reason, the control of bacteria from the Salmonella genus living in the cloaca of laying hens can contribute to the reduction of spreading levels of infections with these bacteria. The most popular methods of rearing laying hens in small agricultural farms comprise run and cage keeping. The aim of the performed studies was to determine the impact of rearing and nutritional systems on the occurrence of egg infections with Salmonella spp. bacteria. Detection by PCR method corroborated presence of bacteria from the Salmonella genus on eggs surface from hens kept in litter system. Latex serotyping test confirmed the presence of Salmonella Enteritidis. Salmonella spp. was not detected on eggs surface from hens kept in cage system. Salmonella spp. isolates from the eggs surface of hens reared on litter were characterized by drug resistance to tetracycline. Addition of EM probiotic failed to show reduction in incidence of Salmonella spp. infection.
  • Item type:Pozycja,
    Distribution of nitrogen compounds in important sections of sugar beets
    (Lodz University of Technology Press, 2016) Bąk, Paulina; Antczak-Chrobot, Aneta; Wojtczak, Maciej
    In literature the beet is often described as consisting of the following technologically important sections: crown, root and tail. The aim of the study was to determine the distribution of nitrogen compounds in the technologically important beet sections of untopped sugar beets with particular emphasis on the content of nitrate and nitrite. The Finezja sugar beet variety had been collected from the clamps in one of the Polish sugar factories in October during 2013/2014 campaign. The untopped sugar beets were divided into three sections: crown, root and tail. The content of total amount of nitrogen, proteinaceous nitrogen, α-amino nitrogen, the sum of the amide and ammonia nitrogen, nitrates and nitrite in these sections were determined. Although the crown of the sugar beet represented only 14.7% of it mass, this section contained on average 30% of the total quantity of α-amino acids as well as amide and ammonia nitrogen. This section contained approximately 77% of the total quantity of nitrate and 88% of nitrite. Untopped sugar beets would introduce much higher amounts of nitrogen compounds in comparison to topped raw material.