Adhesion as a tool for in-built nanotechnology design in cementitious materials

Hebert L. Rossetto,Milton F. de Souza,Victor C. Pandolfelli 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3

Confined water, such as those molecules in nanolayers of 2-3 nm in length, plays an important role in the adhesion of hydrophilic materials, mainly in cementitious ones. In this study, the effects of water containing kosmotropic substances on adhesion, known for their ability of enhancing the hydrogen bond (H-bond) network of confined water, were evaluated using mechanical strength tests. Indeed, to link adhesion provided by water confined in nanolayers to a macro-response of the cementitious samples, such as the bending strength, requires the evaluation of local water H-bond network configuration in the presence of kosmotropes, considering their influences on the extent and the strength of H-bonds. Among the kosmotropes,trimethylamine and sucrose provided a 50% increase in bending strength compared to the reference samples, the latter just using water as an adhesive, whereas trehalose was responsible for reducing the bending strength to a value close to the samples without any adhesive. The results attained opened up perspectives regarding exploring the confined water behavior which naturally occurs throughout the hydration process in cement-based materials.

Heat and Mass Transfer to Air in a Cross Flow Heat Exchanger with Surface Deluge Cooling

Andrea Diani,Luisa Rossetto 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.1

Cross °ow heat exchangers, when applied to cool data center rooms, use external air (process air) to cool the air stream coming from the data center room (primary air). However, an air–air heat exchanger is not enough to cope with extreme high heat loads in critical conditions (high external temperature). Therefore, water can be sprayed in the process air to increase the heat dissipation capability (wet mode). Water evaporates, and the heat °ow rate is transferred to the process air as sensible and latent heat. This paper proposes an analytical approach to predict the behavior of a cross °ow heat exchanger in wet mode. The theoretical results are then compared to experimental tests carried out on a real machine in wet mode conditions. Comparisons are given in terms of calculated versus experimental heat °ow rate and evaporated water mass °ow rate, showing a good match between theoretical and experimental values.

Open source GIS platform for water resource modelling: FREEWAT approach in the Lugano Lake

Massimiliano Cannata,Jakob Neumann,Rudy Rossetto 대한공간정보학회 2018 Spatial Information Research Vol.26 No.3

The FREEWAT platform is an innovative Free and Open Source water resource modelling platform integrated in the QGIS geospatial software, using the SpatiaLite database, and including globally-established simulation codes from the USGS MODFLOW models family. This paper demonstrates its application to the Lugano Lake basin case study, Switzerland and Italy. Two specific modules of the platform were used to execute data integration and analyses: the Observation Analysis Tool and the Lake Package. The first one is a newly developed module facilitating the integration of time-series observations into modelling by enabling pre- and post-processing in the model environment; the latter is an existing MODFLOW package allowing dynamic evaluation of groundwater/lakes interaction. In the case study implementation, a participatory approach was adopted to enhance trust and acceptance of results. These show that integration of simulation codes within GIS is highly appreciated. Furthermore, its openness and freeness allow easily sharing of developed analysis and models. Stakeholders also positively evaluated the participatory process as it empowers decision making with a better understanding of model results and uncertainties. The combination of the FREEWAT platform and the participatory approach may constitute a valuable methodology to include scientifically based analysis to be used for policy design and implementation.

Brazilian Berry Extract Differentially Induces Inflammatory and Immune Responses in Androgen Dependent and Independent Prostate Cancer Cells

Larissa Akemi Kido,Isabela Maria Urra Rossetto,Andressa Mara Baseggio,Gabriela Bortolanza Chiarotto,Letícia Ferreira Alves,Felipe Rabelo Santos,Celina de Almeida Lamas,Mário Roberto Maróstica Jr,Valér 대한암예방학회 2022 Journal of cancer prevention Vol.27 No.3

Jaboticaba is a Brazilian berry, which is rich in fibers and bioactive compounds and shows high antioxidant and antiproliferative activities. Prostate cancer (PCa) is the second most common type of cancer among men and its progression is influenced by androgens and inflammation. Previous studies reported the ability of the jaboticaba to modulate pathways involved in prostate diseases. The main objective of this study was to provide significant data about molecular targets of the jaboticaba peel extract (JPE) and its mechanisms of action in PCa cell lines with different androgenic status (LNCaP and PC-3). The results showed that JPE was able to decrease cell viability in both cell lines. LNCaP showed more sensitivity to JPE exposure, indicating the efficacy of the JPE treatment in terms of androgen responsiveness. JPE showed a distinct hormone dependent effect on the NF-κB signaling, with reduced NF-κB levels for LNCaP and increased NF-κB levels in PC-3 cells. Mechanisms related to cell death by apoptosis were stimulated after the JPE treatment, modulating B-cell lymphoma 2 and BAX for LNCaP and PC-3. Particularly for PC-3, the JPE treatment resulted in cytokine-cytokine receptor interaction activation mostly by up regulating pro-inflammatory, pro-angiogenic, immunostimulatory and immunosuppressive genes. Also, a set of genes related to angiogenesis and metastasis were down-regulated by JPE. In conclusion, JPE exerted an antitumor effect on PCa for both cell lines which can be enhanced if androgenic reliance is considered.

A New Model for Refrigerant Condensation on the Outside of Three-Dimensional Enhanced Tubes

A. Cavallini,D. Del Col,L. Doretti,L. Rossetto,G. A. Longo 대한기계학회 1998 Heat transter conference Vol.6 No.1

Mobility, Infrastructure, and the Humanities

Peter Adey ; Jinhyoung Lee ; Giada Peterle ; and Tania Rossetto Academy of Mobility Humanities 2024 Mobility Humanities Vol.3 No.1

Mobility, suggested John Urry, is fundamental as one of “the infrastructures of social life” (13). Yet mobilities are as equally undergirded by infrastructures of systems that can both enable and disable mobilities. This special issue emerged from the 2022 Global Mobility Humanities Conference, and in this introductory article we open out several problematics which framed some of the conference and introduce further the themes explored by the special issue papers. First, we tease out the academic networks, practices and relations of a broader “infrastructuring” of the (mobility) humanities. Secondly, while theorising a mobility humanities of infrastructure, we introduce the papers by way of exploring several cross-cutting concerns. That is, we discuss how the methodological possibilities stimulated by a humanistic lens may produce nuanced accounts of infrastructures (“Methods as Infrastructures”); how mobility humanities can present the polyvocality of infrastructures, enlarging the conceptualisation of both infrastructure and infrastructuring (“Pluralising Infrastructures”); and how infrastructures can be interrogated ethically and politically in terms of a wide variety of critical issues that pertain to mobility equality, sustainability, and inclusiveness, that is, the notion of mobility justice (“[Ex]change: The [Broken] Promises of Infrastructures.” Thus, we hope this special issue functions as a powerful and productive trigger to stimulate more encounters and develop generative conversations.

Physicochemical properties of a calcium aluminate cement containing nanoparticles of zinc oxide

da Rosa Amanda Freitas,Amaral Thuany Schmitz,Paz Dotto Maria Eduarda,Goulart Taynara Santos,Rossetto Hebert Luís,Bortoluzzi Eduardo Antunes,Teixeira Cleonice da Silveira,Garcia Lucas da Fonseca Robert 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.1

Objectives This study evaluated the effect of different nanoparticulated zinc oxide (nano-ZnO) and conventional-ZnO ratios on the physicochemical properties of calcium aluminate cement (CAC). Materials and Methods The conventional-ZnO and nano-ZnO were added to the cement powder in the following proportions: G1 (20% conventional-ZnO), G2 (15% conventional-ZnO + 5% nano-ZnO), G3 (12% conventional-ZnO + 3% nano-ZnO) and G4 (10% conventional-ZnO + 5% nano-ZnO). The radiopacity (Rad), setting time (Set), dimensional change (Dc), solubility (Sol), compressive strength (Cst), and pH were evaluated. The nano-ZnO and CAC containing conventional-ZnO were also assessed using scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Radiopacity data were analyzed by the 1-way analysis of variance (ANOVA) and Bonferroni tests (p < 0.05). The data of the other properties were analyzed by the ANOVA, Tukey, and Fisher tests (p < 0.05). Results The nano-ZnO and CAC containing conventional-ZnO powders presented particles with few impurities and nanometric and micrometric sizes, respectively. G1 had the highest Rad mean value (p < 0.05). When compared to G1, groups containing nano-ZnO had a significant reduction in the Set (p < 0.05) and lower values of Dc at 24 hours (p < 0.05). The Cst was higher for G4, with a significant difference for the other groups (p < 0.05). The Sol did not present significant differences among groups (p > 0.05). Conclusions The addition of nano-ZnO to CAC improved its dimensional change, setting time, and compressive strength, which may be promising for the clinical performance of this cement.