Repositório Digital da Produção Técnico Científica do IPEN

Submissões Recentes

Cytotoxic evaluation of a peritoneal cisplatin slow-release membrane for ovarian cancer treatment
2025 - SIMONSEN, MARCELO; KATAYAMA, MARIA; ALCANTARA, MARA; JUNQUEIRA, MARA; AGUIAR, FERNANDO; LUGAO, ADEMAR; TALIB, LEDA; ESTEVEZ-DIZ, MARIA; ANDRADE, IGOR M. de; TAYFOUR, NAJLA; MAYERHOFF, ERIC; TSUNODA, AUDREY; ANTONINI, MARCELO; SILVA, LAIS; TEIXEIRA, ANDRESSA; BARBOZA, ISABELA; SAMORA, MICHELLE; SCARANTI, MARIANA; OLIVEIRA, TAIS de; LAGINHA, PAULO; BERTOLAZZI, MARILIA; SOARES, ANDREA; FERNANDES, BRUNO; FOLGUEIRA, MARIA
Evaluation of physical and chemical parameters of substrates and food waste composts for application in green roofs
2025 - LIMA, DANIELE A. V.; FUNGARO, DENISE A.
Green roofs play a fundamental role in contemporary urban planning, offering a wide range of environmental, social, and economic benefits that contribute significantly to the development of more sustainable and resilient cities. These systems help mitigate the urban heat island effect, improve air quality, increase urban biodiversity, reduce stormwater runoff, and enhance building energy efficiency. One of the key components of a green roof is the substrate layer, which is responsible for supporting plant growth, retaining water and nutrients, and ensuring proper drainage. Despite its importance, there is no standardized composition for the substrate, as it must be adapted to local conditions and specific project goals. Given this variability, the objective of the present study was to characterize and compare the main physical and chemical properties of three commercial substrates and two composts derived from food waste. The food waste samples were collected from restaurants and underwent different composting processes. The analysis included physical parameters (such as wet and dry bulk density and total porosity) and chemical parameters (pH and electrical conductivity), as well as moisture content, organic matter, and ash content. Among the commercial substrates analyzed, moisture and electrical conductivity values were the most divergent from the recommended standards. In the case of the food waste composts, the composting method was identified as the main factor influencing their properties. The findings of this research offer valuable information for selecting appropriate substrate materials, particularly in the context of green roof implementation, where substrate performance directly affects system success and long-term sustainability.
Global approaches for ecological restoration in urban environments
2025 - BERTOLETI, ISABELLA A. F.; FERREIRA, MAURICIO L.; GOMES, EDUARDO P. C.; RODRIGUES, ELAINE A.; NIEVOLA, CATARINA C.
Since the Industrial Revolution, global urbanization has expanded rapidly, leading to serious implications for human well-being and biodiversity. The rapid construction of cities has resulted in significant habitat loss, especially in the context of anticipated climate changes. Identifying trends in forest restoration in urban areas can contribute to implementing adaptive and mitigating measures that support future public policies. Using the PRISMA method, this study aimed to identify scientific articles describing restoration approaches in urban forests, focusing on trends that facilitate model development in urban regions facing rising temperatures and droughts. Our results show that, despite convergence favoring ecological restoration in urban areas, the scientific knowledge supporting model development is still in progress. Most reviewed articles focused on countries with temperate forests, while none addressed the tropics. Our results highlight that restoration requires a strategic approach, prioritizing native species and combining local knowledge with scientific expertise. Community involvement and continuous monitoring are crucial to maintaining ecological functions and adapting to rapid climate-related changes occurring globally, especially in the tropical zone. We also emphasize that forest restoration strategies in cities should be incorporated into long-term urban policies and not remain solely within the scope of compensatory actions. This work highlights a gap in forest restoration in urban areas and highlights the importance of countries in tropical regions developing more research with these approaches.
Feasibility study of the use of a silicon photomultiplier coupled to a scintillator for kVp measurement based on spectrometry
2025 - SILVA, JONATHAN R. da; MURATA, HELIO M.; SANTOS, LEONARDO C. dos; ALCANTARA NUNEZ, JUAN A.; CARVALHO, DIEGO V. de S.; SANTOS, ADELSON D. dos; BANOS RODRIGUEZ, UBALDO; POTIENS, MARIA da P. A.; BONIFACIO, DANIEL A. B.
This study proposes a spectroscopic and non-invasive approach to measure the kVp of an X-ray tube using a silicon photomultiplier (SiPM) coupled to a GaGG scintillator crystal. Several experimental setups were explored to assess the feasibility and performance in measuring the kVp based on international standards IEC 61267:2005 and IEC 61676:2002. The energy spectrum was obtained through pulse height analysis. System calibration was performed using radioactive sources emitting characteristic X-rays and gamma radiation. Determination of the maximum energy of the X-ray spectrum was based on a linear regression aiming for a goodness of fit to reduce uncertainty in kVp. The approach was successfully evaluated for specific radiology beams, including mammography, with a maximum uncertainty of 6.5% in the kVp values for the tested beam qualities.

Submissões Recentes

Cytotoxic evaluation of a peritoneal cisplatin slow-release membrane for ovarian cancer treatment

Evaluation of physical and chemical parameters of substrates and food waste composts for application in green roofs

Global approaches for ecological restoration in urban environments

Feasibility study of the use of a silicon photomultiplier coupled to a scintillator for kVp measurement based on spectrometry