The aim of this study was to investigate relations between sense of community, life satisfaction, self-esteem, perceived social support and satisfaction with community services in three territorial communities of dierent sizes. Further, the relations between sense of community and socio-demographic variables (gender, age, marital status, education, children, working in one's own community, owning one's home and group participation) were also studied. The Italian version of the Sense of Community Scale, Rosenberg's Self-esteem Scale, the Satisfaction with Life Scale, the Multidimensional Scale of Perceived Social Support, a scale on Satisfaction with Community Services and a questionnaire were administered to 336 subjects; selection was made in the three communities from 20±60 year-old individuals. Results con®rm that sense of community and life satisfaction are higher in the town than in the larger communities; also, sense of community relates to life satisfaction only in the town and the small city. # 1998 John Wiley & Sons, Ltd.

Compressors installed in plants worldwide can be modified to meet new operating conditions and other specific customer needs. This basic concept is even more relevant in offshore application. Timely upgrading of the centrifugal compressors to suit the late life requirements of the reservoir means, in fact, increasing hydrocarbon recovery versus reservoir depletion. GE Oil & Gas has accumulated extensive experience in upgrading Centrifugal Compressors. Customers can benefit from implementing GE Oil & Gas new technologies and modeling methods that allow the extension of the operational envelope of the compressors beyond that previously possible in a predictable manner. This paper shows the solution adopted by applying GE Oil & Gas design, testing and offshore installation methodologies in the context of brown field constraints to extend gas field production achieving up to 5 additional years through a new re-bundle inside existing casing, obtaining +50% extra polytrophic head versus existing machine and with a new, tailor made, centrifugal compressor, same footprint, obtaining +130% polytrophic head versus original one. INTRODUCTION Centrifugal compression facilities for Natural Gas Export and Enhanced Oil Recovery are affected by substantial changes in the operating conditions, which are the consequence of the reservoir depletion. Compression unit retrofit can be applied to offset those changes by increasing the compressor unit pressure ratio and/or flow rate. At the end of the 90's GE Oil & Gas started to partner with End Users to retrofit the existing equipment by, mainly, changing centrifugal compressor internals, whose design was performed to center the machine envelope to the new operating conditions (as set by the analysis of the constrains, the goals and the thermodynamic performances of the available technology at that time). A decade of experience accumulated in retrofit jobs in both offshore and onshore fields proved that cost effective projects are deliverable by lining up the machine internal stator and rotor components (re-bundle) to new operating conditions, this way avoiding off-design operation and allowing the retrofitted compressor to run outside its original envelope with increased operational efficiency. In the early 2000 GE Oil & Gas started research activities, dedicated to retrofit applications, to develop the aerodynamic performances of the centrifugal compressor impeller stages to further enhance the existing assets value by combining the above approach (retrofit the machine to center it to new operating conditions) with the extra performances of advanced aerodynamic design developed to meet the constrains of brown field jobs.

The paper, taking the Museum of Casa Romei in Ferrara - an UNESCO heritage city - as a case study, explores some new technologies, ranging from surveying to digital communication and investigates their potentialities in improving the sustainability of cultural heritage. The work pursues the dual value of analyzing new tools and providing research products useful for the enhancement of the specific site, favoring the dissemination of consolidated tourist flows from the major monuments of Ferrara to the more peripheral historical urban fabric. Through the theme of analysis, documentation and archiving of architecture and its context, the research - addressing specific themes of integrated and multi-scale survey, 3D processing, 2D drawing, interactive data storage - examines the use of digital technologies for multi-level dissemination of the cultural assets and their possibilities as tools for accessibility and inclusivity.