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107 results on '"Marini, Gustavo"'

2. Impact of reconfiguration on the flow downstream of a flexible foliated plant

Author

Maio Marco, Marini Gustavo, Fontana Nicola, Gualtieri Paola, and Caroppi Gerardo

Subjects
flow-vegetation interaction, riparian vegetation, plant reconfiguration, leaf morphology, turbulence, particle image velocimetry, acoustic doppler velocimetry, Hydraulic engineering, TC1-978
Abstract

This paper explores the impacts of reconfiguration and leaf morphology on the flow downstream of a flexible foliated plant. 3D acoustic Doppler velocimetry and particle image velocimetry were used to experimentally investigate the hydrodynamic interaction between a foliated plant and the flow, testing two plants with different leaves morphology under different bulk flow velocities. The model vegetation was representative of riparian vegetation species in terms of plants hydrodynamic behavior and leaf to stem area ratio. To explore the effects of the seasonal variability of vegetation on the flow structure, leafless conditions were tested. Reconfiguration resulted in a decrease of the frontal projected area of the plants up to the 80% relative to the undeformed value. Such changes in plant frontal area markedly affected the spatial distributions of mean velocity and turbulence intensities, altering the local exchanges of momentum. At increasing reconfiguration, the different plant morphology influenced the mean and turbulent wake width. The leafless stem exhibited a rigid behavior, with the flow in the wake being comparable to that downstream of a rigid cylinder. The study revealed that the flexibility-induced reconfiguration of plants can markedly affect the local distribution of flow properties in the wake, potentially affecting transport processes at the scale of the plant and its subparts.

Published
2022
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3. Direct Grid Connection of a Prototype with Real-Time Control for Energy Recovery and Pressure Control in a Water Distribution Network through Hydraulic Regulation.

Author

Maio, Marco, Marini, Gustavo, Zotti, Fernando, and Fontana, Nicola

Subjects
*FREQUENCY changers, *PRESSURE control, *WATER leakage, *PUMP turbines, *ELECTRIC power distribution grids, *WATER distribution
Abstract

Although pressure regulation valves (PRVs) are commonly used for reducing leakage in water distribution networks (WDNs), in recent years, many studies have highlighted the opportunity of using pumps as turbines (PATs) so as to couple pressure reduction (and thus leakage reduction) with hydropower generation. Unlike in water transmission systems however, flow discharge in a WDN varies continuously, consequently requiring real-time control (RTC) of pressure. Nevertheless, RTC of a PAT in a WDN remains an open issue, due to the lack of information and knowledge about PAT operation in a real environment. Whereas previous experimental studies have described PAT installation with a frequency converter in which the power produced gets dissipated through electrical resistance, in the hydraulic regulation layout, impeller speed depends on the electrical grid. Consequently, this paper proposes a comprehensive algorithm to both control the pressure at the control node of a WDN and produce power through a PAT directly connected to the electrical grid. The operation of the prototype was considered under hydraulic regulation, demonstrated by several studies to represent the most effective trade-off between costs and benefits. Further testing by means of laboratory experiments designed to simulate the operation of a grid-connected PAT installed in a WDN effectively validated the robustness of the proposed method. The results proved the ability of the prototype and algorithm to couple hydropower generation with pressure control even when the flow varied suddenly. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Pressure Reducing Valve Setting Performance in a Variable Demand Water Distribution Network †.

Author

Ferrarese, Giacomo, Fontana, Nicola, Gioffreda, Samuele, Malavasi, Stefano, and Marini, Gustavo

Subjects
WATER demand management, WATER distribution, PRESSURE vessel valves, ENERGY dissipation, WATER pumps
Abstract

Pressure reducing valves (PRV) are widely used to enhance the performance of water distribution networks. Recently, PRVs have tended towards more sophisticated devices to realize complex control strategies. The present work compares network performances achieved with different PRV control methodologies considering variable demand conditions. A widely analyzed water distribution network is modeled using EPANET and used to simulate the PRV operation. The results show the effectiveness of the different control strategies, highlighting the amount of saved water, the pressure deficit occurring in critical nodes, and the power dissipated by the valve that can be potentially recovered using pumps as turbines or other emerging energy recovery technologies. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Innovative Approach for Selection of Pump as Turbine in Water Distribution Network †.

Author

Marini, Gustavo, Maio, Marco, Di Menna, Francesco, Pugliese, Francesco, De Paola, Francesco, and Fontana, Nicola

Subjects
WATER distribution, WATER leakage, WATER pumps, HYDRAULICS, TURBINES
Abstract

While pressure reducing valves (PRVs) have been widely used in water distribution networks (WDNs) to reduce water leakage, research in recent years has focused on the use of turbines instead of PRVs as the means for enabling both pressure reduction and energy production. However, in WDNs daily continuous variability of flow discharge and upstream head make PAT selection a challenging issue. The present paper describes an innovative approach for optimal PAT selection in systems with hydraulic and/or electrical regulation. The methodology was also applied to a district of the Benevento, Italy, WDN, showing the effectiveness of the proposed approach. The findings showed the optimal pumps lie in the vicinity of the maximum of the produced energy. Furthermore, considering weekday pattern instead of long-period pattern gives reliable results only if the PAT system operated with hydraulic regulation. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Análisis CIPEI No. 17. Edición especial, GEFI

Author

Marini, Gustavo, Fernández Alonso, José, Lagorio, Franco, Roldán, Valentina, Sacco, Irene, Cusumano, Florencia, Assefh, Narena, and Imola, Juan Ignacio

Subjects
Pandemia, Economía internacional, Política monetaria, Deuda soberana, Monedas digitales, Medio ambiente, FMI - Fondo Monetario Internacional
Abstract

La presente edición especial recoge los esfuerzos de un conjunto de integrantes del Grupo de Estudios sobre Finanzas Internacionales (GEFI) en la búsqueda de la producción de conocimiento innovador y comprehensivo en las numerosas dimensiones inherentes a las finanzas y las políticas monetarias internacionales. Para ello se abordan las negociaciones argentinas con el FMI, la sostenibilidad de la deuda soberana, el financiamiento internacional en contexto de pandemia, las cuestiones climáticas en las finanzas internacionales, las monedas digitales y la crisis de Evergrande en China. Fil: Fernandez Alonso, José. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina.

Published
2021

21. Numerical Performance Assessment of a Centrifugal Pump As Turbine (PAT)

Author

Pugliese, Francesco, De Paola, Francesco, Giugni, Maurizio, Fontana, Nicola, Marini, Gustavo, Fernandez, Joaquin Francos, Pugliese, Francesco, De Paola, Francesco, Giugni, Maurizio, Fontana, Nicola, Marini, Gustavo, and Fernandez, Joaquin Francos

Abstract

The implementation of a Computational Fluid Dy-namics (CFD) model to assess the performances of a Pump As Turbine (PAT) is introduced and prelimi-nary results are discussed.

Published
2018

23. Gullo, Marcelo (2018). Relaciones Internacionales. Una teoría crítica desde la periferia sudamericana, Editorial Biblos, Buenos Aires, 319 páginas

Author

Marini, Gustavo

Subjects
Periferia sudamericana, Relaciones Internacionales, Teoría crítica
Abstract

Reseña del libro de GULLO, Marcelo (2018). Relaciones Internacionales. Una teoría crítica desde la periferia sudamericana, Editorial Biblos, Buenos Aires Fil: Marini, Gustavo. Universidad Nacional de Rosario; Argentina

Published
2018

26. Pressure surges during filling of partially empty undulating pipelines.

Author

Balacco, Gabriella, Fontana, Nicola, Apollonio, Ciro, Giugni, Maurizio, Marini, Gustavo, and Piccinni, Alberto Ferruccio

Subjects
WATER management, HYDRAULIC transients, AIR valves, PIPELINES, OSCILLATIONS
Abstract

Transients generated by expulsion of air pockets in water pipelines represent a key issue in the management of water systems. Severe pressure surges may arise, with detrimental effects on pipelines, valves and other devices. To analyze the transient and predict the resulting pressure surge, both theoretical and experimental studies have been developed in the literature. However, most studies consider horizontal or vertical pipelines, whereas the actual profile in the real field environment is a sequence of ascending and descending pipes. Consequently, this paper summarizes laboratory experiments carried out on an undulating pipeline, with an orifice fitted at the high point to simulate an air release valve. In the experiments, the orifice diameter, the supply pressure and the air volume entrapped in the descending pipe were varied. In almost all the runs, the peak pressure was achieved during the mass oscillation transient. Water hammer only occurs because of the expulsion of air bubbles within the water column, but generally the effect on the transient is fairly negligible. Results also showed that pressure surges decrease upon increasing the orifice diameter, except for high supply pressure and small-entrapped volume, for which an intermediate 'critical' orifice diameter can be identified. [ABSTRACT FROM AUTHOR]

Published
2021
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28. Experimental analysis of Pumps As Turbines

Author

PUGLIESE, Francesco, DE PAOLA, FRANCESCO, GIUGNI, MAURIZIO, Fontana, Nicola, Marini, Gustavo, Comitato Editoriale IDRA16, Pugliese, Francesco, DE PAOLA, Francesco, Fontana, Nicola, Giugni, Maurizio, and Marini, Gustavo

Published
2016

35. Modelos de desarrollo e inserción internacional: aportes para el análisis de la política exterior argentina desde la redemocratización 1983-2011

Author

Busso, Anabella, Actis, Esteban, Lorenzini, María Elena, Zelicovich, Julieta, Fernández Alonso, José, Simonoff, Alejandro, Ceppi, Natalia, Fabani, Ornela, Novello, María Rocío, Marini, Gustavo, Paredes Rodríguez, Rubén, Pignatta, María Eva, and Calderón, Emilse

Subjects
Política exterior, Modelos de desarrollo, Argentina, Relaciones internacionales
Abstract

Este libro muestra parte de los resultados obtenidos a través del proyecto de investigación titulado “Modelos de desarrollo e inserción internacional. Aportes para el análisis de la política exterior argentina desde la redemocratización (1983-2011)”, financiado por la Agencia de Promoción Científica y Tecnológica bajo el código PICT-2011-0681. Los motivos que impulsaron esta empresa pueden retrotraerse a los años 2009 y 2010 cuando, tanto en el ámbito académico como en el de los análisis de prensa, aparecían evaluaciones significativamente contrapuestas sobre la política exterior argentina de entonces. En ese marco, un conjunto de docentes-investigadores radicados en la Facultad de Ciencia Política y Relaciones Internacionales de la Universidad Nacional de Rosario se plantearon superar los análisis de coyuntura y orientar el debate hacia las causas de la inestabilidad de la política exterior argentina a partir de la redemocratización. Esta tarea, a la que se sumó un colega de la Universidad Nacional de La Plata, se canalizó en la presentación de un proyecto a la Agencia de Promoción Científica y Tecnológica. Fil: Actis, Esteban. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Lorenzini, María Elena. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Zelicovich, Julieta. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Busso, Anabella. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Fernández Alonso, José. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Simonoff, Alejandro. Universidad Nacional de La Plata; Argentina. Fil: Ceppi, Natalia. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Fabani, Ornela. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Novello, María Rocío. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Marini, Gustavo. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Paredes Rodríguez, Rubén. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Pignatta, María Eva. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Calderón, Emilse. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina. Fil: Zelicovich, Julieta. Universidad Nacional de Rosario. Facultad de Ciencia Política y Relaciones Internacionales; Argentina.

Published
2016

37. Economía Internacional. Claves teórico-prácticas sobre la inserción de Latinoamérica en el mundo

Author

Fernández Alonso, José, Actis, Esteban, Bonaldo Coelho, Diego, Boisier, Guy, Bueno, María del Pilar, Liceth Fajardo, Claudia, Fuders, Felix, Otero, Ronald Macaucé, Marini, Gustavo Alberto, Max-Neef, Manfred, Moncada Marino, Cristian, Paredes Rodríguez, Rubén, Sinisterra, Mónica María, and Zelicovich, Julieta

Subjects
Economía internacional, Estrategias epistemológicas y metodológicas, Realidad social
Abstract

A semejanza de toda realidad social -siempre compleja y variable-, la economía internacional exige un abordaje comprehensivo e integral. En efecto, al comprender el dinámico universo de transacciones económicas entre múltiples actores –públicos o privados- en la arena internacional, todo ensayo de aproximación a la misma debe escapar de toda lectura simplificadora, dogmática. La globalización, cual proceso político-económico mundial contemporáneo cuyas manifestaciones se exponen en cada instante de nuestra cotidianeidad, evidencia a todas luces esta proclama. Este proceso, tan “cercano” como “internacional” (Giddens, 2001), se encuentra signado por la mutabilidad y la recursividad, todo lo cual impide que su abordaje desde posicionamientos cerrados, definitivos.El presente capítulo introductorio se propone avanzar sobre las características de la economía internacional en tanto recorte específico de la realidad social, para sentar así las bases de las estrategias epistemológicas y metodológicas para su comprehensión. Ceñido a la identificación de la economía internacional como objeto de estudio huidizo de las interpretaciones unicausales y/o simplificadoras, se remarca la necesidad de diseñar y ejecutar un enfoque multidisciplinario y atento siempre a las necesidades del contexto social respecto al conocimiento sobre la misma. Fil. Actis, Esteban. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina Fil. Bueno, María del Pilar. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina Fil. Fernández Alonso, José Marcelino. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina Fil. Marini, Gustavo Alberto. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina Fil. Paredes Rodríguez, Rubén. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina Fil. Zelicovich, Julieta. Universidad Nacional de Rosario, Facultad de Ciencia Política y Relaciones Internacionales. Rosario; Argentina

Published
2014

41. Aspetti entropici di correnti a pelo libero. Nuovo approccio teorico proposto per i profili di velocità

Author

Marini, Gustavo

Abstract

A new theoretical approach based on principle of maximum Shannon entropy is proposed to estimate the variability of a function defined in two-dimensional space. This approach is applicable to whatever variable defined in a two dimensional domain when you need understand how that varies. By means of this approach an analytical model for two-dimensional velocity distribution, in open channel flow, is developed. The model-derived velocity data are compared with experimental data derived by laboratory tests, on purpose carried out, and by river measures. This comparison shows that the accuracy of the method is bigger or comparable to that obtained by using other literature methods and needs less information to be applied. Nella tesi viene proposto un nuovo approccio teorico basato sul principio della massima entropia definita da Shannon per la valutazione della variabilità di una generica funzione, definita in un dominio bidimensionale. Sulla base di tale approccio è stato poi messo a punto un modello teorico per la stima della distribuzione di velocità in una corrente a pelo libero. I valori ottenuti dal modello sono stati successivamente confrontati con misure sperimentali ricavate sia nell’ambito di un’estesa indagine di laboratorio all’uopo attivata, sia a partire da misure in sito su corsi d’acqua naturali. Il confronto mostra che il metodo proposto fornisce risultati generalmente più accurati (o comunque analoghi) rispetto a quelli forniti dai modelli di letteratura, pur richiedendo una minore quantità di informazioni per essere applicato.

Published
2009
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42. Fuerzas profundas e identidad: reflexiones en torno a su impacto sobre la política exterior. Un recorrido de casos

Author

Busso, Anabella, Pignatta, María Eva, Zubelzú, Graciela, Cabeza, Marta, Rodríguez, Rubén Paredes, Oliva, Carla V., and Marini, Gustavo

Subjects
China, US, Excepcionalismo, Estados Unidos, Afghanistan, Irak, Oriente medio, terrorism, Irán, Terrorismo, Iran, Identidad, Russia, Religion, Exceptionalism, Middle East, Política exterior, Identity, Iraq, Rusia, Religión, Afganistán, Foreign policy
Abstract

Tomo 1 La obra que presentamos en este primer tomo es parte de los resultados obtenidos en los proyectos de investigación “Políticas exteriores comparadas: una primera aproximación” y “Políticas exteriores: enfoques comparativos aplicados a estudios de caso”, ambos desarrollados y financiados en el marco del programa 202 de la Secretaría de Ciencia y Técnica de la Universidad Nacional de Rosario. Fil: Busso, Anabella. Universidad Nacional de Rosario; Argentina Fil: Pignatta, María Eva. Universidad Nacional de Rosario; Argentina Fil: Zubelzú, Graciela. Universidad Nacional de Rosario; Argentina Fil: Cabeza, Marta. Universidad Nacional de Rosario; Argentina Fil: Rodríguez, Rubén Paredes. Universidad Nacional de Rosario; Argentina Fil: Oliva, Carla V. Universidad Nacional de Rosario; Argentina Fil: Marini, Gustavo. Universidad Nacional de Rosario; Argentina

Published
2008

47. Experimental assessment of pressure-leakage relationship in a water distribution network.

Author

Fontana, Nicola, Giugni, Maurizio, and Marini, Gustavo

Subjects
COMPUTER simulation, WATER distribution, WATER leakage -- Management, WATER pressure, POWER law (Mathematics)
Abstract

The use of numerical simulations to improve the management of water distribution networks (WDNs) has dramatically increased in recent decades. Nevertheless, the modeling of leakages is still a major issue to face when setting up a model of a WDN. Because water losses increase at increasing pressure, they are usually modeled by assuming a leakage node behaves like an emitter. Unfortunately, a definitive assessment of the leakage law exponent is as yet lacking in the literature. Consequently, a field analysis was carried out on an existing WDN: (a) to assess whether the power law can effectively represent the relationship between leakage and pressure; and (b) to calculate the value of the exponent. A 3-month measurement campaign was developed, aiming at assessing the dependence of the losses to the pressure. The analysis showed that the power law equation with an exponent around 0.7 can well represent the pressure--leakage relationship. [ABSTRACT FROM AUTHOR]

Published
2017
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