420 research outputs found
Antonio Invernizzi (Turin, 1 January 1941 – 2 December 2021)
No full textObituary Prof. Antonio Invernizzi Università di Torin
Toward Effective Monitoring of Diffuse VOC Emissions: A Critical Discussion and Review of the Applications of EN 17628:2022
No full textThe estimation and characterization of diffuse emissions of volatile organic compounds (VOCs) is a crucial issue for industry and environmental regulators. Compared to channelled ones, diffuse emissions derive from complex (non-point) sources, such as wastewater treatment plants, storage tanks, and process unit components. Such sources are typically influenced by dynamic factors such as operational activities and weather conditions. Therefore, this complexity makes the localization and quantification of diffuse VOC emissions a crucial challenge from a technical and regulatory perspective. Recently, the technical standard EN 17628:2022 has been published, which provides a framework to address this issue, proposing five different techniques for the localization, identification, and quantification of diffuse emissions. Nevertheless, while it represents a step forward in this field, the standard shows some shortcomings for a proper implementation, potentially causing divergent interpretations of the guidelines. The accuracy of the measurements is highly dependent on the configuration and morphology of the site, but especially on the meteorological data implemented to calculate the emitted flux. In addition, these techniques, despite being well-established, are particularly complex from both a technical–scientific and logistical–economic point of view. An emerging method, Quantitative Optical Gas Imaging (QOGI) appears to theoretically overcome some issues, but requires further studies to ensure accurate and reproducible quantification of emissions. This review aims to highlight the advantages, disadvantages, and potential developments of the various techniques described in the standard for the characterization of diffuse VOC emissions in the industrial sector
Myelodysplastic/myeloproliferative neoplasms
No full textAccording to the World Health Organization (WHO) classification of tumors of hematopoietic and lymphoid tissues, myelodysplastic/myeloproliferative neoplasms are clonal myeloid neoplasms that have some clinical, laboratory, or morphologic findings that support a diagnosis of myelodysplastic syndrome, and other findings that are more consistent with myeloproliferative neoplasms. These disorders include chronic myelomonocytic leukemia, atypical chronic myeloid leukemia (BCR-ABL1 negative), juvenile myelomonocytic leukemia, and myelodysplastic/myeloproliferative neoplasms, unclassifiable. The best characterized of these latter unclassifiable conditions is the provisional entity defined as refractory anemia with ring sideroblasts associated with marked thrombocytosis. This article focuses on myelodysplastic/myeloproliferative neoplasms of adulthood, with particular emphasis on chronic myelomonocytic leukemia and refractory anemia with ring sideroblasts associated with marked thrombocytosis. Recent studies have partly clarified the molecular basis of these disorders, laying the groundwork for the development of molecular diagnostic and prognostic tools. It is hoped that these advances will soon translate into improved therapeutic approaches
Emissioni diffuse: l’implementazione di metodi di calcolo per la stima di emissione da serbatoi di stoccaggio
No full textI compiti degli organi di controllo in presenza di operazioni straordinarie: spunti di riflessione
No full textIl saggio analizza i principali compiti e adempimenti che l'organo di controllo (il collegio sindacale nel modello tradizionale di governance) si trova a dovere affrontare laddove la società intenda prendere parte a un'operazione straordinaria, come un conferimento d'azienda o una fusione
Esigenze di sistematicità e trasparenza nelle contabilità delle pubbliche amministrazioni
No full textEsigenze di sistematicità e trasparenza nelle contabilità delle pubbliche amministrazion
Geometric control for autonomous underwater vehicles: Overcoming a thruster failure
No full textThe goal of this paper is to show how geometric control theory can be used to design efficient trajectories for an autonomous underwater vehicle descending into a basin, as well as performing its recovery after experiencing an actuator failure. The underwater vehicle is modeled as a forced affine connection control system, and the control strategies are developed through the use of integral curves of rank one and kinematic reductions. Such a method is particularly efficient in case of actuator failure and it provides a constructive way to design trajectories for the new under-actuated system. A typical scenario of basin descent is presented, control signals are computed to realize the desired trajectories and some simulations are provided
The Development and Optimization of a New Wind Tunnel Design for Odour Sampling
No full textThe characterization of passive area sources, emitting odours due to wind-driven convection, poses significant challenges. The present experimental study aims to evaluate the performance, in terms of fluid dynamics and mass transfer, of a recently developed wind tunnel, with a more compact design and reduced weight, compared to the one proposed by the Italian regulations. The results show that the new design outperforms the Italian standard in several aspects. From a fluid dynamic point of view, the new wind tunnel exhibits a slightly more homogenous and uniform velocity distribution, and it does not reveal airflow preferential channels inside the central body. The pressure tests highlight that the presence of fillers in the new wind tunnel does not significantly alter the pressure inside the hood and therefore the gas–liquid equilibrium conditions; actually, the slight overpressure may help to prevent the infiltration of external air. Finally, mass transfer tests on the standard device show a vertical concentration gradient along the outlet duct, highlighting concentration values that differ up to a factor of two depending on the measurement point. The new design has almost completely solved this issue, thanks to the use of fillers that promote mixing of the outlet flow
Oggetto e metodo nel pensiero di Carlo Masini: appunti di un ex "giovane cultore di Economia aziendale"
No full textHopf bifurcation analysis in a modified R&D model with delay
No full textfirst_pageDownload PDFsettingsOrder Article Reprints Open AccessArticle Hopf Bifurcation Analysis in a Modified R&D Model with Delay by Yang Cao 1,Ferrara Massimiliano 2,3,4,*ORCID,Gangemi Mariangela 2,4ORCID andGuerrini Luca 4,5ORCID 1 School of Cyber Science and Engineering, Southeast University, Nanjing 210096, China 2 Department of Law, Economics and Human Sciences, “Mediterranea” University of Reggio Calabria, Via dell’Università, 25, 89124 Reggio Calabria, Italy 3 ICRIOS—The Invernizzi Centre for Research in Innovation, Organization, Strategy and Entrepreneurship, Department of Management and Technology, Bocconi University, Via Sarfatti, 25, 20100 Milano, Italy 4 Decision Lab, “Mediterranea” University of Reggio Calabria, Via dell’Università, 25, 89124 Reggio Calabria, Italy 5 Department of Management, Polytechnic University of Marche, Piazzale Martelli 8, 60121 Ancona, Italy * Author to whom correspondence should be addressed. Axioms 2022, 11(4), 148; https://doi.org/10.3390/axioms11040148 Submission received: 28 November 2021 / Revised: 20 March 2022 / Accepted: 21 March 2022 / Published: 24 March 2022 (This article belongs to the Special Issue Dynamical Systems: Advances in Theory and Applications) Downloadkeyboard_arrow_down Browse Figures Versions Notes Abstract We consider a duopoly game model of R&D (research and development) rivalry between two high-tech firms with time delay, in which a monopoly sector with R&D spillover is studied using a mixture of game theory and nonlinear dynamics theory. The local asymptotic stability of the equilibrium point is studied by analyzing the corresponding characteristic equation. It is found that the delay can lead the system dynamic behavior to exhibit stability switches and Hopf bifurcations appear
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