3,391 research outputs found
La Galleria Nazionale delle Marche negli anni di Luigi Serra
No full textIl contributo si concentra sull’attività svolta da Luigi Serra, Soprintendente delle Marche, per la Galleria Nazionale di Urbino per circa un quindicennio, fino al 1930. Profondo conoscitore del territorio marchigiano, Serra ha il merito di aver patrocinato l’inventariazione dei monumenti e degli oggetti artistici conservati nelle città marchigiane e di aver incrementato il patrimonio artistico della Galleria Nazionale di Urbino impegnandosi in una tenace campagna di acquisti, depositi e donazioni per la Galleria. Parallelamente, oltre ad acquisire nuovi ambienti espositivi del Palazzo ducale di Urbino crea, in conformità con altri esempi dell’epoca, un nuovo allestimento pensando di riproporre in quelle sale il carattere di una abitazione rinascimentale, grazie anche agli arredi in stile che si alternano a dipinti e sculture
Histo-anatomical observations on some eastern Mediterranean wild orchids
No full textAnatomical and histological observations have been carried out on the stem (inflorescence axis) and leaf structure of twelve species of Orchis, Ophrys and Barlia sampled on the East Mediterranean islands of Crete and Rhodes. This study represents the preliminary phase of a wider morphological analysis regarding European and Mediterranean wild orchids, carried out to verify orchid relationships and some taxonomic interpretations. Relatively few studies, concerning histological and anatomical analysis, have been conduced on vegetative organs of European terrestrial orchids: Camus and Camus, (1928); Solereder and Meyer, (1930); Borsos, (1980); Del Prete et al., (1991); Stern, (1997); Del Prete and Miceli, (1999); the more recent studies nevertheless have provided a useful contribution to knowledge of orchid relationships.The leaves appeared bi-facial in all examined species: the vascular bundles were in a single row in the middle of the mesophyll, the xylem oriented to adaxial surface; stomata were found to be abaxial and superficial; epidermal cells were approximately isodiametric in transversal section and the adaxial noticeably greater than abaxial cells. With regards to mesophyll structure two different groups were distinguishable: Ophrys heldreichi x O. reinholdii, O. tenthredinifera, O. iricolor, Orchis italica, O. quadripunctata and O. sancta had a compact, homogeneous mesophyll. In Ophrys cretica ssp. cretica, O. cretica ssp. karpathensis, O. episcopalis, O. heldreichi, O. spruneri and Barlia robertiana instead, there was a loose mesophyll structure; in some of these species the mesophyll was found to be differentiated into a palisade and a spongy tissue.Transversal sections through the stems showed a mechanical sheath separating the cortex and ground tissue in all species. Observation under fluorescent light made it possible to identify the degree of lignification of the cell walls, and class it as a sclerenchymatous ring. Barlia robertiana presented a vascular system characterized by many collateral vascular bundles, scattered in the peripheral area of the ground parenchyma. In Orchis and Ophrys species observed instead, the vascular bundles were neatly arranged in a circle at the periphery of the ground tissue: in O. quadripunctata and O. italica the vascular bundle were so peripheral that they made contact with the sclerenchymatous ring, as reported for Orchis mascula in a previous study (Del Prete and Miceli, 1999). In all the Ophrys species examined, but also in Orchis sancta, the vascular bundles were arranged below the sclerenchymatous ring but with a portion of ground tissue interposed. This evidence could support the suggestion, made by Strack et al., (1989), that Orchis sancta and the related species O. coriophora, O. fragrans and O. martrinii be placed in a separate genus, Anteriorchis
Collezionismo a Modena e Reggio tra Otto e Novecento
No full textIl contributo, dedicato alle Mostre di Arte antica organizzare a Reggio Emilia nel 1876 e nel 1899 e a Modena nel 1906, offre una nuova testimonianza, oltre agli studi da tempo avviati sulle raccolte d'arte delle due città estensi, per approfondire la vivace realtà del collezionismo privato di questi luoghi, tra la fine dell'Ottocento e i primi anni del Novecento
Renata Rocco: Danilo di Prete
No full textDanilo di Prete. Painting no. 1, c. 1964. Mixed media painting technique. Measures and collection are unknown Danilo di Prete: Between Syndical Exhibitions in Italy and São Paulo Biennial of Art The project has as its main goal the case study of the Italian artist Danilo di Prete (Pisa, 1911 – São Paulo, 1985) who acted in the Brazilian artistic milieu from 1946 on, when he immigrated to São Paulo, where he stayed until his death. While he lived in Viareggio, Italy, he took part in several sh..
Influence of moderate temperature variation on fibers for MSFRCs
No full textFibre reinforced concretes are nowadays widely adopted in some constructions sectors. Their increasing adoption has been supported by many research studies that guided the definition standards and guidelines for testing and design. Nevertheless some aspects of their behaviour have not yet been deeply studied and understood; for instance the effect of temperature variations on concretes with polymeric fibres has received limited attention in the literature. In this framework, the present paper presents a study on the influence of temperature variation on macro-synthetic fibers for FRCs. In particular, single polypropylene fibers were tested at different temperatures, 20°C, 40°C, 60°C, 80°C, and different rates, under tensile load, analyzing how the increment of temperature affects their strength and elastic modulus
Experimental Investigation on the Influence of Temperature Variations on Macro-synthetic Fibre Reinforced Concrete Short and Long Term Behaviour
No full textIn the last decades, fibre reinforced concretes became widely adopted in structural applications. Nevertheless, some elements of their mechanical behaviour are not fully understood. For instance, the effect of environmental conditions on the short and long-term behaviour of these materials has been studied to a limited extent only. In this perspective, the present paper presents the results of a large experimental campaign involving flexural tests on Macro Synthetic Fibre Reinforced Concrete (MSFRC) specimens under short- and long-term loads. Two different polypropylene Fibres were used, with dosages of 8 kg/m3 and 10 kg/m3. The effect of temperature on the short-term behaviour of these materials was investigated by performing three-point bending tests at 20 °C and 40 °C in cracked and uncracked conditions. The effect of temperature variations on long-term deformations was studied by means of four-point bending tests on pre-cracked notched beams at increasing temperatures, from 20 °C to 40 °C. The paper presents the test results as well as analyses the effective number of fibres crossing the cracks
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