223 research outputs found
L' arte della decorazione italiana : studiata sugli archi e i graffiti di Roma sul Palazzo di Caprarola e sulle targhe delle carte geografiche del Vaticano
No full textillustrata in ordine alla storia e alle arti dal Genesio MorandiGeschenkexlibris-Etikette: ""Dieses Geschenk verdankt die Bibliothek der E.T.H. der Freigebigkeit von Dr. Ing. Aldo Müller St. Georgenstrasse 12, Winterthur - Es stammt aus dem Nachlass von Architekt Gustav Emil Müller 1844-1924" 002106137_0002 Exemplar der ETH-BI
Transcritical and zero-Hopf bifurcations in the Genesio system
No full textAgraïments: The first author is supported by FAPESP Grant No. 2013/24541-0. Both authors are supported by CAPES Grant 88881.030454/2013-01 Program CSF-PVE.In this paper we study the existence of transcritical and zero--Hopf bifurcations of the third--order ordinary differential equation a b c x - x^2 = 0, called the Genesio equation, which has a unique quadratic nonlinear term and three real parameters. More precisely, writing this differential equation as a first order differential system in \R^
Transcritical and zero-Hopf bifurcations in the Genesio system
No full textAgraïments: The first author is supported by FAPESP Grant No. 2013/24541-0. Both authors are supported by CAPES Grant 88881.030454/2013-01 Program CSF-PVE.In this paper we study the existence of transcritical and zero--Hopf bifurcations of the third--order ordinary differential equation a b c x - x^2 = 0, called the Genesio equation, which has a unique quadratic nonlinear term and three real parameters. More precisely, writing this differential equation as a first order differential system in \R^
Zero-Hopf Bifurcation in a Generalized Genesio Differential Equation
No full textThe purpose of the present paper is to study the presence of bifurcations of zero-Hopf type at a generalized Genesio differential equation. More precisely, by transforming such differential equation in a first-order differential system in the three-dimensional space R3, we are able to prove the existence of a zero-Hopf bifurcation from which periodic trajectories appear close to the equilibrium point located at the origin when the parameters a and c are zero and b is positive
Validazione di un punteggio ad hoc per la ricerca di mutazioni subtelomeriche in pazienti con ritardo mentale
No full textNegative elevation-dependent warming trend in the Eastern Alps
No full textMountain regions and the important ecosystem services they provide are considered to be very vulnerable to the current warming, and recent studies suggest that high-mountain environments experience more rapid changes in temperature than environments at lower elevations. Here we analysed weather records for the period 1975-2010 from the Eastern Italian Alps that show that warming occurred both at high and low elevations, but it was less pronounced at high elevations. This negative elevation-dependent trend was consistent for mean, maximum and minimum air temperature. Global radiation data measured at different elevations, surface energy fluxes measured above an alpine grassland and above a coniferous forest located at comparable elevations for nine consecutive years as well as remote sensing data (MODIS) for cloud cover and aerosol optical depth were analysed to interpret this observation. Increasing global radiation at low elevations turned out to be a potential driver of this negative elevation-dependent warming, but also contributions from land use and land cover changes at high elevations (abandonment of alpine pastures, expansion of secondary forest succession) were taken into account. We emphasise though, that a negative elevation-dependent warming is not universal and that future research and in particular models should not neglect the role of land use changes when determining warming rates over elevation.II
The spine instability neoplastic score (SINS) in the assessment of response to radiotherapy for bone metastases
No full textBACKGROUND:
Vertebral metastases are often causing pain and spine instability. Radiotherapy is of significant benefit for painful spine metastases but the response can be very variable. The spine instability neoplastic score (SINS) is a recent classification system for diagnosis of spinal instability caused by vertebral metastases. We analysed the degree of pain relief, the need of drug therapy and the imaging features and the SINS before and after radiotherapy. In particular, we investigated the possible correlation of spine instability defined by pre-treatment SINS with pretreatment pain and with response to radiotherapy.
MATERIAL/METHODS:
This study included 121 patients with spine metastases treated with palliative 3D conformal radiotherapy. Pain "at rest" and "breakthrough pain", need for drug therapy in terms of "anti-inflammatory", "weak opioid", "strong opioid", imaging studies and SINS were assessed before and after radiotherapy. Statistical analysis was performed by the correlation coefficient of Spearman and Kruskal-Wallis test.
RESULTS:
Pain relief after radiotherapy was observed in 50.4 and 57.8% of patients in terms of pain at rest and breakthrough pain, respectively. The correlation between pain before radiotherapy and SINS was not statistically significant for both pain at rest (p = 0.4) and breakthrough pain (p = 0.49). The correlation between pain response after radiotherapy and SINS was statistically significant for both pain at rest (p = 0.007) and breakthrough pain (p = 0.047).
DISCUSSION/CONCLUSION:
The degree of instability, classified according to SINS, resulted to be predictive factor for pain response after radiotherapy. SINS might become a valid tool to identify those patients who can benefit the most from radiotherapy
Biochar as a strategy to sequester carbon and increase yield in durum wheat
No full textCarbon sequestration in agricultural soils is a climate change mitigation option since most of cultivated soils are depleted of soil organic carbon and far from saturation. The management practices, most frequently suggested to increase soil organic carbon content have variable effects depending on pedo-climatic conditions and have to be applied for a long time periods to maintain their sink capacity. Biochar (BC), a carbon rich product obtained through carbonization of biomass, can be used for carbon sequestration by applying large amounts of carbon very resistant to decomposition. The BC remains into soil for a long time and there is evidence that the BC stores atmospheric carbon from centennial, to millennial timescales. However most of the agronomic studies on BC application have been made in tropical and sub-tropical climates, while there is a substantial lack of studies at mid-latitudes and in temperate climates. This paper presents the results on an investigation of large volume application of BC (30 and 60 t ha−1) on durum wheat in the Mediterranean climate condition, showing the viability of BC application for carbon sequestration on this crop. BC application also has positive effects up to 30% on biomass production and yield, with no differences in grain nitrogen content. Moreover no significant differences between the two BC treatments were detected, suggesting that even very high BC application rates promote plant growth and are, certainly, not detrimental. The effect of the biochar on durum wheat was sustained for two consecutive seasons when BC application was not repeated in the second yea
Land use change and soil organic carbon dynamics in Mediterranean agro-ecosystems: the case study of Pianosa Island
No full textIn agro-ecosystems, land use change and the associated management practices exert a strong impact on soil organic carbon (SOC) stock variation. SOC dynamics are generally not linear and several years are required to
reach a new equilibrium. Consequently, short-term assessments may be inadequate to represent these dynamics while long-term datasets are often scarce to derive rates of change. In this context, the integration
of different methodologies appears to be an interesting approach to improve the capacity for predicting SOC evolution under human induced and climate drivers. The Island of Pianosa (Tuscan Archipelago, Italy) is an interesting case study for SOC evolution related to land use change, as it was intensively cultivated for several centuries and completely abandoned since the end of the 1990s. This paper presents seven years of carbon flux measurements from the typical abandoned Mediterranean ecosystem of Pianosa.
These measurements are also integrated into a modeling framework, with soil sampling and historical information, to assess the past and predicted SOC evolution in relation to land use change. Results show that the abandoned ecosystem was able to rapidly recover the SOC depleted during agricultural exploitation, increasing SOC content by about 30% above the 1990s value. The model simulations, forced by the Had3_A1Fi climatic scenario, predicted an increasing SOC sequestration until the middle of this century under unmanaged conditions. However, re-cultivation of these soils may potentially cause a SOC loss ranging from 4.1 to 5.8 kg C m−2 in 90 years, if appropriate soil conservation management practices are not implemented
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