255 research outputs found
Admittance Matrix Method for Modeling Transients in a Laboratory Water Network
No full textThis paper presents an innovative application of the admittance matrix method for modeling the transient response of a real laboratory pipeline network: a two-loop district metered area (DMA) setup at the University of Perugia’s Water Engineering Laboratory comprising high-density polyethylene (HDPE) pipes. By employing the admittance matrix method, the computational efficiency of the modeling process is significantly enhanced. Our findings underscore the importance of considering viscoelastic parameters calibrated by a genetic algorithm to optimize the simulation of experimental data. The outcomes demonstrate a robust methodology capable of capturing the nuanced behaviors of complex water distribution systems, providing a critical tool for engineers and researchers in the field
Pump operations-induced transients in water distribution systems. Laboratory experiments
No full textPump startup and shutdown induce transients in pressurized water distribution networks (WDNs) that can cause significant pressure variations, posing a risk to the system's integrity, and potentially leading to fatigue failures. This paper presents laboratory experiments designed to study pump-induced transients in a full-scale WDN at the Water Engineering Laboratory of the University of Perugia, Italy. The experimental setup includes a network of high-density polyethylene pipelines arranged in two loops, supplied by pumps set in series. Various pump startup and shutdown scenarios were tested, and the resulting transient pressures were acquired at multiple locations in the network. Both short- and long-period analyses of the experimental pressure signals identify the most vulnerable sections of the network as those either closest to the pump station or located in smaller-diameter pipelines, where wave interactions and trapped surges amplify pressure fluctuations. Particularly under low-demand (e.g., nighttime-like) conditions, these transient waves intensify. The findings also reveal how changes in network configuration and boundary conditions can significantly influence transient dissipation rates. The results provide valuable insights for water utility managers, aiding in the identification of critical network portions and the optimization of pump operations to preserve system integrity
DEBORA: Developing an Interface to Support Collaboration in a Digital Library
No full textInterfaces to library systems have largely failed to represent the in-herently collaborative nature of information work. This paper describes how collaborative functionality is being implemented as part of the DEBORA project to provide access to digitised Renaissance documents. Work practices of users of Renaissance documents are described and the collaborative features of the client software are outlined. Functionalities discussed include annotation, the creation of virtual books and the inclusion of user-supplied metadata
Effects of User-Induced Transients on a Service Line: Preliminary Results from WEL (Perugia, Italy)
No full textThe integrity of water service lines (SLs), crucial components in water distribution networks, is potentially threatened by transients generated by users’ activity. This paper presents the results of laboratory tests carried out at the Water Engineering Laboratory of the University of Perugia (Italy) to investigate the effects of user behavior on an SL. In particular, transients due to changes in the discharge in the SL, simulating the activation of domestic devices, are investigated. The analysis of the effect of such maneuvers provides insights that can assist water utility managers in the design, installation and maintenance of SLs
On the avant-garde : Bruno Schulz and Debora Vogel
No full textIn his recent book devoted to the study of Schulz, Michał Paweł Markowski rebukes the scholars of Schulz that they have ignored the indebtedness of the write r in Hegel's philosophy, and at the same time he claims that it is hard to find in Schulz any evidence that he had actually read the philosopher. The author of the article argues the contrary: Hegelian themes are treated by Schulz with an ironic distance, and it is certain the w rite r read Hegel as his
closest friend, Debora Vogel, devoted her PhD dissertation to the author of The Phenomenology of Spirit. The influence of Hegel can be rather seen in Vogel's writings, as she
was fascinated by the avant-garde idea of progress pursued by the anonymous masses. Seemingly Schulz the bumpkin is behind but in the long run he went ahead of his friend,
because unlike her he stressed the subjective aspect of the avant-garde revolution. Jarzębski Wobec awangardy: Bruno Schulz i Debora Vogel
Homogenization of conservation laws with oscillatory source and non-oscillatory data
No full textWe consider a scalar conservation law with oscillatory, periodic source term and with oscillatory initial data.
For possibly resonant initial data, we prove a corrector-type result for this problem, extending a previous one by
the author [Asymptotic Anal. 46 (2006), 53-79]. Here we can relax the assumption of well-prepared data
interessi sociali, concorrenza e pluralismo istituzionale nei servizi pubblici locali
No full textThe article tries to truce the connection between Pubblic Administration and Local Pubblic Services in the perspective of an institutional and social pluralism. Moving from the analysis of the changes occured to State intervention in economy and the ineraction of pubblic and private sector, the Author analyse the most recent reforms of Local Pubblic Services'legislation and the impact of the new costitutional federalism in the role of the different level of governament in managing and regulating Pubblic Service
Managing today's news media : audience first /
No full textThe business of journalism is in the midst of massive change. Managing Today's News Media: Audience First offers practical solutions on how to cope with and adapt to the evolving media landscape. News media experts Samir Husni, Debora Halpern Wenger, and Hank Price introduce a forward-looking framework for understanding why change is occurring and what it means to the business of journalism. Central to this new paradigm is a focus on the audience. The authors introduce "The 4Cs Strategy" to describe how customers, control, choice, and change are all part of a strategy for successful media organizations. Every chapter in the book relates to one or more of these four key principles: * Customer - Each platform must offer a unique experience to the customer. ...Includes bibliographical references (pages 203-210) and index.The business of journalism is in the midst of massive change. Managing Today's News Media: Audience First offers practical solutions on how to cope with and adapt to the evolving media landscape. News media experts Samir Husni, Debora Halpern Wenger, and Hank Price introduce a forward-looking framework for understanding why change is occurring and what it means to the business of journalism. Central to this new paradigm is a focus on the audience. The authors introduce "The 4Cs Strategy" to describe how customers, control, choice, and change are all part of a strategy for successful media organizations. Every chapter in the book relates to one or more of these four key principles: * Customer - Each platform must offer a unique experience to the customer. ...Description based on MARC record for print version
Violence, Chaos and Theophany in Habakkuk 3
No full textDivine violence often causes scandal, since the current image of divinity is one-dimensional, focused on features such as mercy, justice, forgiveness, etc. In reality, the Bible – First and New Testaments – is not afraid to present many faces of God, even those that are scandalous to us. The aim of this paper is to show the role of divine vio- lence in restoring order in the cosmos through the analysis of one of the most complex texts of the First Testament: Abakkuk 3. The restoration of the cosmic order is also the restoration of good and earthly justice. It is evident, however, that the world of the con- temporary reader is different from that of the author and his readers: textual analysis shows the distance that separates them and, at the same time, opens up a space of issues that solicits numerous questions about our way of place ourselves in front of religion and the divine, on our presuppositions and our expectations
Jean Baudrillard: cynism or truth?
No full textJean Baudrillard was one of the leading intellectuals of the twentieth century.
Baudrillard, who died on 6th March 2007 in Paris, conceived an acute observation and, on many
occasions, complex, ambiguous and difficult interpretation of contemporary society for him (and
us). Reassuming the observations that revolve around the French philosophy’s simulacra concept
during the 1960’s1, Baudrillard focused his attention on the relationship which is established
between this concept and the vast, symbolic horizon produced by the simulative condition present
in society.
Considered as being the father of the simulacra concept and according to this author, postmodern
society is differentiated from the previous period, the modern age, because of its being
organised in compliance with a new, simulation logic and on the continuous interchange of images
and signs. Differently, in fact, from modern society, which was structured according to the linear
and precise production logic; current society is based on the proliferation of codes, models and
signs and the new rules dictated by simulation.
Some, important thematic nucleuses and perspectives emerged from his analysis and shall be
expanded upon below
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