3,914 research outputs found
Ceramiche da fuoco tardoantiche da Dyrrachion (Albania): un primo approccio morfologico ed archeometrico
No full textANALISI ARCHEOMETRICHE SU CERAMICHE DA FUOCO TARDOANTICHE DA DYRRACHION (ALBANIA): NUOVI DATI.
No full textThis work, together with a paper previously published on LRCW2, allows a first classification of the ceramic manufactures wellmatched
with the geolithological characteristics of the district of Durrës (Albania). In the earlier phase of the research
archaeological and archaeometric studies were carried out on selected samples representative of cooking ware forms brought to
light in late roman layers of abandonment of a thermal complex located in Dyrrachion (Durrës) and dated back to the end of the 1st
and the beginning of the 2nd century AD. The polarizing microscope observation of thin sections permitted the petrographic
classification of 10 selected samples into 5 ceramic pastes, which were differentiated by means of the compositional and/or textural
features of the sand temper. During this second phase of the research, the petrographic characterization was extended to further 13
representative samples of cooking ware more recently discovered in late-antique contexts of the macellum/forum of Dyrrachion and
autoptically selected, increasing therefore the statistical basis. The data obtained by the new microscopic observations of thin
sections let the types of ceramic paste to be absolutely reduced to 3. The most part of the analyzed samples were classified in the
ceramic paste typology 1/1A, which is characterized by temper components mostly weathered from acid crystalline rocks and only
subordinately from volcanic lithotypes as well as sedimentary silicatic rocks. This paste has been mostly recognized in globular pots
with everted rim, having sometimes an internal ridge or concavity for lid setting and two ribbon handles. Considering the
geolithology of central-western Albania, it is possible to refer the three ceramic pastes to local or at least regional productions
Franciscans and Mathematics. The Case of Mariotto Guiducci, Friar Minor and Abacus Master (1427- Post 1496
No full textIl contributo intende tracciare un profilo del fiorentino Mariotto Guiducci, frate minore e maestro d’abaco del XV secolo, autore di un trattato matematico conservato alla Biblioteca Nazionale di Firenze. Attraverso risultanze archivistiche e bibliografiche edite e inedite, il caso di studio può offrire ulteriori spunti per una riflessione intorno al tema, recentemente ripreso, dei rapporti tra francescanesimo e scienze matematiche fra medioevo e rinascimento. L’indagine proposta si articola in due parti: la prima parte apre uno squarcio sulla famiglia Guiducci e l’insegnamento della matematica pratica a Firenze e a Prato, accennando alla vita conventuale e all’esperienza di insegnante di fra Mariotto; la seconda è dedicata al codice autografo e al Libro d’arismetricha in esso contenuto, espressione di una cultura matematica tipica della tradizione abacistica.The paper focuses on the figure of Mariotto Guiducci, a Florentine franciscan friar and abacus master from the 15th century, author of a mathematical treatise preserved in the National Library of Florence. By archival and bibliographical records, the case study may offer further insights about the topic, recently revived, on the relationship between Franciscanism and the mathematical sciences between the Middle Ages and the Renaissance. The article is divided in two parts: the first opens a glimpse into the Guiducci family and the teaching of practical mathematics in Florence and Prato, hinting at the convent life and experience of Mariotto; the second part is dedicated to the autograph codex and the Libro d’arismetricha, expression of a mathematical culture typical of the abacus tradition
Urinary tract infections: An overview of urine collection, imaging, and prevention
No full textThe management of children with a febrile urinary tract infection has always been a matter of debate. While some recent trials have succeeded in leading to agreement on certain issues, other important points of contention remain, in particular urine collection methods, imaging strategies, and prevention of recurrence. All urine collection methods, both invasive and noninvasive, carry a risk of contamination by bacteria not present in the bladder, with a mean rate of 25 %. In our opinion, clean-voided methods should be the first choice as they are relatively easy to perform, reliable, cost-effective, and acceptable to children, parents, and caregivers. We suggest using invasive methods only when a child is in poor general health. The need for imaging after a first febrile urinary tract infection has long been debated. New insights have led the authors of the current guidelines to consider less aggressive imaging strategies than before. Considering the high rate of spontaneous resolution of vesicoureteral reflux with age and the good renal outcome for patients with scarring, without major congenital renal abnormalities, we discourage the routine execution of voiding cystography and renal DMSA scans. Many risk factors for recurrence have been described. While some are not modifiable (age, white race, familiarity), others (reflux, voiding habits, phimosis, bladder function, constipation, and fluid intake) can be modified through behavioral changes and/or medical interventions. Although some controversy regarding preventive interventions still exists, the role of antibiotic prophylaxis has been reassessed, and none of the more recent guidelines suggest a routine use
La fosfatasi alcalina elevata quasi per caso
No full textE' descritto un caso di iperfosfasasemia alcalina transitoria dell'infanzi
Soil Fertility Management and Crop Productivity in Conventional and Organic Systems Including Field Crops and Vegetables
No full textAn increasing number of researches has been carried out dealing with long term experiments (LTEs)
with the aim of evaluating the effects of organic and conventional cropping systems on crop productivity
and soil fertility management. These LTEs are often based on specialized cropping systems as they
include only field crops or only vegetable crops. This is due to the peculiarity of farm machineries, farmer
competences, and the needs of the market chains, that all push towards an intense specialization within
only field crops or only vegetables. However, considering the base agroecological principles, a high
diversity of crop species, including both field crops and vegetables is expected to be more rational and
sustainable, especially in the case of an organic farm management. Several LTEs have been designed
and set up with the inclusion of both field crops and vegetable species (as pure crops or intercrops) and
with cover/green manure crops in the crop rotation.
This contribution reports evidences on crop productivity and soil fertility from the BIOSYST LTE, which
has been running for 20 years at the Field Lab of the DSA3
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