Inovatívny pohľad na vzdelávanie v oblasti prírodných vied predstavuje vzdelávací program ExpEdícia – skús, skúmaj, spoznaj. Ponúka možnosť vyučovať prírodovedné predmety cez systematicky aplikované prvky IBSE, priestor na vzdelávanie učiteľov a prípravu vhodných učebných a metodických materiálov. Cieľom príspevku je priniesť pohľad na monitorovanie kognitívneho vývinu žiakov dlhodobo sa učiacich vo vzdelávacom programe a zároveň ich porovnanie so žiakmi učiacimi sa tradičným spôsobom, dominante výkladom. V triedach bol aplikovaný test Inventory of Piaget’s Developmental Tasks (IPDT), ktorým sa sledovala dosiahnutá kognitívna úroveň žiaka, a bipolárna výroková škála (BSS), ktorou sa sledovala schopnosť uchopiť abstraktný obsah. Výsledky poukazujú na rozdiel medzi žiakmi ZŠ vo veku 14–15 rokov učiacich sa tradične (12 škôl, 14 tried, 287 žiakov) a učiacich sa ExpEdíciou (2 školy, 4 triedy, 83 žiakov) vo všetkých sledovaných parametroch (IPDT o 10 bodov, miskoncepcie o 2). Vzhľadom na to, že výsledky žiakov zapojených v programe sa javia výrazne lepšie než u tradičných žiakov možno predpokladať, že vzdelávacie prostredie, ktoré sa pre žiakov v rámci programu tvorí, má pozitívny vplyv na dosiahnutie ich výsledkov.
The use of advanced treatment technologies such as pyrolysis and carbonization of bio-waste materials has the promise to develop coupled solutions for organic C and P problems in the future of food processing. Sewage sludge-derived pyrogenic materials that are applied to the soil system contain notable levels of P (1–20%). However, only a small portion of total phosphorus is available for plants. Therefore, our study assessed the pretreatment of sewage sludge with Na2CO3 and subsequent pyrolysis at 400 °C and 500 °C for the production of MPCM400 and MPCM500 as potential alternatives for inorganic P fertilizers. Non-pretreated sewage sludge-derived pyrogenic carbonaceous materials (PCM400 and PCM500) were produced as controls. The derived materials obtained by slow pyrolysis at a residence time of 120 min and pyrolysis temperatures of 400 °C and 500 °C, were analyzed by determination of electrical conductivity (EC), pH, elemental analysis of total C, H, N, scanning electron microscopy (SEM) and total concentrations of P, Cd, Fe, Pb and Zn. PCM400, PCM500, MPCM400 and MPCM500 were characterized by analysis of total 16 US-EPA (U.S. Environmental Protection Agency) PAHs by a toluene extraction procedure. Additionally, PCM400, PCM500, MPCM400 and MPCM500 were tested by a germination test with cress seeds (Lepidium sativum L.) and a short-term rye seedling test. Total C concentrations were raised in the order: MPCM500 < MPCM400 < PCM500 < PCM500. Concentration of Σ16 US-EPA PAHs was almost five times higher at PCM500 (21.87 mg/kg) compared to PCM400 (4.38 mg/kg) and three times higher at MPCM500 (23.12 mg/kg) compared to MPCM400 (7.55 mg/kg) with a dominant role of two and three-ring aromatic structures. Total P-concentrations in rye biomass increased in the order for the controls: (2.43 ± 0.95 mg/g) < PCM400 (3.57 ± 0.27 mg/g) < PCM500 (4.04 ± 0.24 mg/g) < MPCM400 (5.23 ± 0.09 mg/g) < MPCM500 (5.57 ± 0.70 mg/g) < IF (7.53 ± 2.65 mg/g). Obtained results showed that pyrolysis materials produced from sewage sludge represent a potential alternative of conventional P inorganic fertilizers and organic C suppliers.
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