172,785 research outputs found
C. Morozzi, “ La casa futura”
No full textL'articolo recensisce l'opera di Patrizia Ranzo e Sergio Cappelli, in relazione al concetto di abitare
C. Donà, Casa e natura
No full textL'articolo recensisce e pubblica l'opera di design di Patrizia Ranzo e Sergio Cappelli "La casa del naturalista
Instrumentation and Control Systems for Nuclear Power Plants
No full textInstrumentation and Control Systems for Nuclear Power Plants provides the latest innovative research on the design of effective modern I&C systems for both existing and newly commissioned plants, along with information on system implementation. Dr. Cappelli and his team of expert contributors cover fundamentals, explore the most advanced research in control systems technology, and tackle topics such as the human– machine interface, control room redesign, and control modeling. The inclusion of codes and standards, inspection procedures, and regulatory issues ensure that the reader can confidently design their own I&C systems and integrate them into existing nuclear sites and projects
The STP algorithm as Overfitting Avoidance Tool in Tree Based Methodologies
No full textNell’ambito dei metodi di classificazione e regressione ad albero si mostrerà come l’algoritmo STP (Cappelli et al, 2001) costituisca un utile strumento di overfitting avoidance. Il problema dell’ overfitting si sostanzia nella presenza di “false” suddivisioni che riflettono peculiarità dei dati piuttosto che relazioni realmente esistenti tra la variabile di risposta ed i predittori. I metodi classici utilizzati per far fronte a tale problema essendo basati sulla valutazione dell’overfitting in termini di errore appaiono non del tutto appropriati all’uopo. Per contro, la procedura STP, essendo impostata sulla valutazione della relazione di dipendenza tra la variabile di risposta e le variabili di split, è in grado di valutare la presenza di sovradattamento e conservare le sole suddivisoni realmente esplicative
Multiple Structural-Change Model Analysis via Theoretical Regression Trees
No full textThe analysis of structural-change models is nowadays a
popular subject of research both in econometric and
statistical literature. The most challenging task is to identify
multiple breaks occurring at unknown dates. In case of multiple shifts in mean Cappelli et al (2008) have proposed a method based on regression trees. In this paper we propose an extension of this method to address the problem of estimating the break dates and their number in the general framework of the linear model with multiple structural changes. We present simulation results pertaining to the behavior of the proposed approach
Foreword
No full textBreve prefazione in inglese all'opera che include contributi in diverse lingue (francese, tedesco, spagnolo e inglese
Principles of I&C systems for nuclear plants
No full textIn this chapter, an introduction to the Instrumentation and Control (I&C) systems is given. What is a control system? What is its relevance to a nuclear plant? How a control system architecture can be designed? The answers to these and other questions are briefly given here, while more detailed descriptions will be provided in the following chapters. The chapter, therefore, stands as a forerunner and critical summary of the chapters to come, which will have the task of illustrating in detail and individually all the themes only mentioned here. In particular, the basic issues of the safe control of a reactor, its modeling, and how some of the main types of nuclear reactors have implemented the principles of control in operational practice will be addressed. Finally, I&C systems technology is addressed, particularly regarding the evolution from analog to digital, which is then dealt with more specifically in the following chapters, and issues concerning the interaction between technology and human beings. The chapter closes with a description of how today the safety problem is faced in all its forms and represents the great challenge of the nuclear industry's future
Nuclear I&C systems current trends and future challenges
No full textIn this chapter, we will focus on the current trends emerging in the world of I&C in general and its application to the nuclear world in particular. It will necessarily be a bird's eye view, as nothing is more unpredictable than technological development. Therefore, the objective of the chapter is not the claim to provide a complete overview, but the idea of stimulating the ideas that are emerging in recent years in the world of research on instrumentation and control in the nuclear field. We leave then the task to the reader to follow its evolution, not always linear, in future years
Assignment of the Equus caballus interleukin 8 gene (IL8) to chromosome 3q14.2-> q14.3 by in situ hybridization
No full text© 2006 S. Karger AG, BaselNergadze, S.G. ; Magnani, E. ; Attolini, C. ; Bertoni, L. ; Adelson, D.L. ; Cappelli, K. ; Verini Supplizi, A. ; Giulotto, E
Maximum speed of shortening and ATPase activity in atrial and ventricular myocardia of hyperthyroid rats
No full textThe kinetic properties of the myofibrillar system of atrial and ventricular myocardia of hyperthyroid rats were analyzed by determining ATPase activity and maximum shortening velocity. Hyperthyroidism was induced by daily subcutaneous injections of triiodothyronine (0.2 mg/kg body wt) for 2 wk. The treatment induced a marked atrial and ventricular hypertrophy and, in ventricular myocardium, an isomyosin shift toward a homogeneous V1 composition. Skinned trabeculae and purified myofibrils were prepared from atrial and ventricular myocardia. Enzymatic assays on the myofibrils showed that both Ca-stimulated ATPase activity and Ca-Mg-dependent ATPase activity had equal values in atrial and ventricular myocardia. In skinned trabeculae during maximal Ca activations, force-velocity curves were determined by load-clamp maneuvers, and unloaded shortening velocity (Vo) was obtained with the slack-test method. Both maximum shortening velocities extrapolated from the force-velocity curves (Vmax) and Vo were significantly higher (+68 and +52%, respectively) in atrial than in ventricular preparations. Developed tension was significantly greater in ventricular preparations. Maximum power output was not significantly different. Previous findings (V. Cappelli, R. Bottinelli, C. Poggesi, R. Moggio, and C. Reggiani. Circ. Res. 65: 446-457, 1989) had led to the conclusion that variations in ATPase activity and shortening velocity of ventricular myocardium can be accounted for by changes in isomyosin composition. In this light, the present results suggest that 1) ATPase activity is equal in atrial and ventricular myocardia as the two tissues contain the same myosin heavy chain isoform, 2) the difference in maximum speed of shortening between atrium and ventricle might be due to the presence of tissue-specific isoforms of myosin light chains
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