Lazzarin, R.; Casasola, L. (Bari Univ. (Italy). Ist. di Fisica Tecnica ed Impianti Termotecnici; CERIT SpA, Pordenone (Italy))
For air conditioning in the CERIT (Regional Center for Technological Research) building of Pordenone (Italy), a solar plant was installed, with a surface area of 430 square meters of evacuated-tube collectors, a reflecting surface of the same area, and an absorption refrigerating system. Furthermore, this plant was equipped with a 43 cubic meter heat storage unit at the temperature of 80-90 degrees C and also a 150 cubic meter cold storage unit. The choice of the collectors was made after a series of tests on various models existing on the market. A careful calculation was carried out on the advantages of flat reflectors. An estimate, reflecting results after one year of operation, of the plant's performance was developed.
Lazzarin, R.; Romagnoni, P.; Casasola, L. (Bari Univ. (Italy). Ist. di Fisica Tecnica ed Impianti Termotecnici CERIT S.p.A., Pordenone (Italy) Padova Univ. (Italy). Ist. di Fisica Tecnica)
The largest European solar air conditioner (equipped with 440 square meters of aluminized Myler reflection panels; 440 square meters of Cortec evacuated tube solar collectors; 150 and 43 cubic meter, respectively, cold and hot water storage tanks; 50 kW absorption machine; 4 cylinder compression chiller; and natural gas fired boiler for winter space heating) was built at the CERIT (Regional Technological Research Center) of Pordenone, Italy. This article, with the aid of flowsheets, outlines the plant's key design and operational features, and tables performance and energy consumption data to back up a discussion of the major results achieved during two years of operation. Particular attention is given to the plant's seasonal performance.
Lazzarin, R.M.; Romagnoni, P. (Padua Univ. (Italy)); Casasola, L. (CERIT, Pordenone (Italy))
A solar plant was installed with a surface area of 440 m[sup 2] of evacuated-tube collectors, a reflecting surface of the same area and an absorption refrigeration system for air-conditioning the CERIT building of Pordenone. A 43 m[sup 3] heat-storage unit, at temperatures of 80-90[sup o]C, and a 150 m[sup 3] cold-storage unit were also installed. These components form the largest solar cooling plant in Europe. After two years of operation, it is possible to evaluate the project as a whole, and to appreciate the contribution of the flat solar reflector and the working of the absorption unit. (Author)
Development of a slightly cooled ceramic guide blade of the first turbine stage. Part-project 188.8.131.52. Final report; Entwicklung einer schwach gekuehlten keramischen Leitschaufel der ersten Turbinenstufe. Teilprojekt 184.108.40.206. Abschlussbericht
Wittig, S.; Schulz, A.; Gutmann, C.; Dilzer, M.
The example of a highly loaded gas turbine guide blade is presented in order to outline the potential of optimisation of the available numerical methods in the field of ceramic materials. Starting from a structure-mechanical component analysis using the FE method, the temperature and stress distribution in the component is defined. The failure probability of a component can then be assessed in consideration of the calculated component stress using the fracture statistics processor CERITS, which was developed at the Department of Turbomachinery. Longer life of ceramic components necessitates the shaving of stress peaks, which in ceramic materials cannot be reduced by plastic deformation. Component stresses can be reduced by reducing the thermal stresses induced by temperature gradients. An analysis of the ceramic shell structure resulted in the following design guidelines for components under high thermal stress: (a) homogeneisation of the temperature distribution inside the component, (b) compensation of thermal stresses, (c) adaptation of stiffness. (orig./MM) [Deutsch] Im Rahmen dieses Vorhabens soll, am Beispiel der hochbelasteten Gasturbinen-Leitschaufel aufgezeigt werden, welches Potential die durch derzeit verfuegbare numerische Verfahren gegebenen Optimierungsmoeglichkeiten fuer die Keramikanwendung darstellen. Ausgehend von einer strukturmechanischen Bauteilanalyse mit der FE-Methode kann eine Ermittlung und Bewertung der Temperatur- und Spannungsverteilung im Bauteil vorgenommen werden. Mit dem am Institut fuer Thermische Stroemungsmaschinen entwickelten Bruchstatistikprozessor CERITS kann unter Einbezug der zuvor berechneten Spannungsbelastung des Bauteils eine Bestimmung der Bauteilausfallwahrscheinlichkeit erfolgen. Das angestrebte Ziel einer keramischen Komponente mit einer ausreichenden Lebensdauer kann nur erreicht werden, wenn Spannungsspitzen, die von keramischen Werkstoffen nicht durch plastische Deformation reduziert werden koennen, vermieden
Balaguer-Núez, L.; Galadí-Enríquez, D.; López del Fresno, M.; Solano, E.; Jordi, C.; Sézima, T.; Paunzen, E.
We present an advanced, VO-compliant version of Clusterix, a tool for the determination of membership probabilities in stellar clusters from proper motion data. Clusterix is a web-based, interactive application that allows the computation of membership probabilities from proper motions through a fully non-parametric method. Version 1.0 (http://clusterix.cerit-sc.cz/) was developed as a collaboration between the Masaryk University (Czech Republic) and the Universitat de Barcelona (Spain), as a complement to the WEBDA (http://webda.physics.muni.cz) database of observational data on stars in open clusters. Clusterix 2.0 (http://clusterix.cab.inta-csic.es/clusterix/) is oriented towards the exploitation of Gaia data products. With the participation of the Spanish Virtual Observatory, Clusterix now features an improved user interface for a faster, easier and more accurate interactive definition of the cluster and field proper motion distributions. The system provides fast feedback between membership probability determinations and the distribution of observables for the most probable members and field stars, with graphic tools to display, for instance, photometric diagrams on the fly. Furthermore, Clusterix 2.0 is fully VO-compatible, what opens interesting prospects for the astrophysical exploitation of the improved membership probabilities that will be capable to provide for many open clusters observed by Gaia.
Negulescu, Elena; Săbău, Gavril; Massonne, Hans-Joachim
The Leaota Massif in Romania consists of a flat-lying sequence of five structurally concordant units displaying mutual and partly internal lithologic and metamorphic contrasts. The lower part of the lithologic sequence is the Iezer Complex, a medium-grade psammopelitic unit with a structurally concordant thin granite sill located at its upper part. The lower limit of the granite is marked discontinuously by hornfels, also present as enclaves, which experienced intense strain and a subsequent low-pressure thermal overprint. Both granite and hornfels were affected by a medium-temperature, medium- to high-pressure event (Săbău, 2000). This event was also identified in gneisses below the hornfels. These rocks contain the assemblage garnet-phengite-chloritoid-kyanite which had overprinted an older garnet-kyanite-staurolite-biotite-muscovite assemblage. Available U-Th zircon ages indicate 472.7 ± 7.3 Ma (Balintoni et al. 2009) for the granite. Monazite geochronology (Săbău & Negulescu, 2013) reveals for the associated hornfels (1) inherited ages of 528 ± 17.86 Ma overprinted by pervasive Ordovician contact metamorphism (462 ± 4.54 Ma), slightly postdating the age of magmatic zircon in the granite, (2) Silurian to Early Devonian recrystallization episodes, and (3) a Variscan medium- to high-pressure metamorphic overprint responsible for the garnet-phengite-kyanite assemblage. New petrological and geochronological data constraining the polymetamorphic evolution of the upper part of the Iezer Complex were acquired from kyanite-garnet mylonitic gneisses made up of large garnet porphyroclasts embedded in a strongly deformed matrix. Large garnets are rich in quartz, phengite, epidote, kyanite, rutile, and ilmenite inclusions. Biotite, chlorite, apatite, monazite, and Al-cerite inclusions are also present. Garnet porphyroclasts are wrapped by laminae of small garnet - white mica - biotite - quartz or zoisite - kyanite - plagioclase alternating with bands made up of fine
Buttinelli, M.; Bianchi, I.; Anselmi, M.; Chiarabba, C.; de Rita, D.; Quattrocchi, F.
The Tolfa-Cerite volcanic district developed along the Tyrrhenian passive margin of central Italy, as part of magmatic processes started during the middle Pliocene. In this area the uncertainties on the deep crustal structures and the definition of the intrusive bodies geometry are focal issues that still need to be addressed. After the onset of the spreading of the Tyrrhenian sea during the Late Miocene, the emplacement of the intrusive bodies of the Tolfa complex (TDC), in a general back-arc geodynamical regime, generally occurred in a low stretching rate, in correspondence of the junctions between major lithospheric discontinuities. Normal faults, located at the edge of Mio-Pliocene basins, were used as preferential pathways for the rising of magmatic masses from the mantle to the surface. We used teleseismic recordings at the TOLF and MAON broad band station of the INGV seismic network (located between the Argentario promontory and Tolfa-Ceriti dome complexes -TDC-) to image the principal seismic velocity discontinuities by receiver function analysis (RF's). Together with RF’s velocity models of the area computed using the teleseismic events recorded by a temporary network of eight stations deployed around the TDC, we achieve a general crustal model of this area. The geometry of the seismic network has been defined to focus on the crustal structure beneath the TDC, trying to define the main velocity changes attributable to the intrusive bodies, the calcareous basal complex, the deep metamorphic basement, the lower crust and the Moho. The analysis of these data show the Moho at a depth of 23 km in the TDC area and 20 km in the Argentario area. Crustal models also show an unexpected velocity decrease between 12 and 18 km, consistent with a slight dropdown of the Vp/Vs ratio, imputable to a regional mid-crustal shear zone inherited from the previous alpine orogenesis, re-activated in extensional tectonic by the early opening phases of the Tyrrhenian sea. Above
Celal Teyyar UĞURLU
Full Text Available In our rapidly changing and developing world, organizations maintain struggle to survive in competition environment. This struggle forced the organizations to notice social factors as well as economic factors. One of the basic issues encountered by contemporary organizations is about how society perceives the organization. Organizations become more accountable to society nowadays and thus it becomes inevitable that they portray a positive image to be characterized as successful organizations. Image is a perception manner that emerges in thoughts of external participants which based on organization members for development and consist of vision, mission and values of the organization (Sabuncuoğlu, 2004. According to Hatch and Schultz (2002, image was described as overall thought about how organization creates an impression on members and others. Like other branches, education was effected by developments emerge in the current competition environment. Especially, new developments emerged right after progress of computer technologies did not enable staying in national borders and required to be operated in an international environment (Cerit, 2006. From the point of education institutions, experiences during application period, advertising and public relations and applicant providing activities are very important for the emergence of first perception and this perception plays a crucial role in decision to apply for a school (Collins and Stevens, 2001. This situation increase competition among high schools. To be a preferred high school by students, creating a positive organizational image is considered as a significant factor. Therefore, it was tried to determine teachers’ perceptions about images of high schools. At the same time, people create their perceptions about an organization as a result of interaction with this organization. For that reason, in determining level of organizational level, information related to this organization should be
Hasan Basri Gündüz
management can be handled at various levels from ecosystem level to cell level (Odum, 1983. For example, human body is controlled by the brain that functions through billions of nerve cells and each of these cells is controlled by their DNAs that are placed in the nucleus. In fact DNA is the administrative unit of the cell or organism (Alberts, Bray, Lewis, Raff, Roberts & Watson, 1994; De Robertis & De Robertis, 1981. Therefore, the administration in one of the cell of the organism can be taken as a metaphor to explain the administration of an organisation in social system. Metaphors have a coherence and internal consistency, which provide insights into ideas that are not explicit or consciously held (Arnett, 1999; Tsoukas, 1991; Oxford et al., 1998; Cerit, 2008; Lakoff & Johnson, 2005; Şişman, 2002a; Morgan, 1998. Organizations within a social system can be considered as cells of the social system. Every organization has similar core structure as the cells of an organism that have the same DNA. Vision, mission, organizational culture and administrative approach of an organization constitute its core DNA. The degree of integration of an individual to an organization depends on how well he/she internalizes the philosophy, vision, mission and culture of an organization (Ball, 1997. Leader as an individual who shapes vision, mission and culture of the organization, should enable members to learn and accept organization’s vision, mission and culture. LeadershipLeadership is a subject that has long excited interest among scholars and layman alike. The term leadership means different things to different people. As is often the case when a word from the common vocabulary is incorporated into the technical vocabulary of a scientific discipline, leadership has not been precisely redefined, and it still carries extraneous connotations that create ambiguity of meaning. Further confusion is caused by the use of other imprecise terms such as power, authority, management