1,721,093 research outputs found
Come stratificare e come ridurre il rischio chirurgico-anestesiologico in chirurgia vascolare.
No full textRiduzione del rischio cardiovascolare in chirurgia non cardiac
Test for the equality of multinomial parameters
No full textIn this paper we face the problem of testing the equality of two or more parameters of amultinomial distribution. We develop a likelihood ratio test and we consider an asymptotically equivalent Pearson's statistic. Moreover we develop an exact and a randomized test. Relationships
between these tests are then discussed. The behaviour of these tests is studied by simulations. Results from two known tests developed for less general situations are compared to ours
Nonparametric Estimation for accelerated life testing under imperfect repair.
Full text linkThis paper considers nonparametric estimation of lifetime distribution of a system subject to imperfect repair, based on data from constant stress accelerated life tests. By assuming as time transformation function relating stress to lifetime, a version of the inverse power law, a method of estimating the lifetime distribution at use condition stress has been recently proposed by Diana and Giordan. This method, based on the Brown-Proschan imperfect repair model, is nonparametric in that it does not make any assumptions about the underlying distribution of life length. Some simulations to understand if accelerated life tests can be used instead of normal tests evaluate the behaviour of the test procedure
The performance of Geneva apple rootstocks in the province of Trento
No full textIn spring 2011, six trials of dwarf and semi-dwarf apple (Malus domestica
Borkh.) rootstocks to study the performance of yield and fruit quality were
established in the province of Trento in two distinct sites: 210 m a.s.l. (S1) and 650 m
a.s.l. (S2). ‘Gala’, ‘Golden Delicious’ and ‘Fuji’ were chosen as scion cultivars. The M9
T337 clone was compared to two Geneva® genotypes: G11 and G16. Besides these,
other genotypes such as the M9 clone Pajam 2, Supporter® 4 Pi80 and CIV-P21 were
also compared to M9 T337. The cultivars did not have the same number of genotypes,
therefore a comparison of genotypes in each cultivar and each cultivar in the two
localities were compared. Trees were trained as spindle. After 5 years, there were
significant differences in growth of trees at the two locations. Trees at S1 had higher
trunk cross sectional area than trees at S2. Among the genotypes, tree size was largest
with P21 and smallest with M9 T337 and Pajam 2. Likewise, G11 and G16 were higher
than M9 T337 in ‘Fuji’ and similar to ‘Golden Delicious’. Instead, in ‘Gala’ G16 was
significantly higher than M9 T337. Trees on G11 and G16 had similar yield as M9
T337. Yield efficiency was higher at S2 than at S1. G11 and G16 had similar yield
efficiency as M9 T337 in ‘Fuji’ and ‘Golden Delicious’, and lower in ‘Gala’. S2 trees had
higher number of fruits and lower fruit weight compared to S1. G11 had higher fruit
weight than M9 T337 in all the cultivars while G16 in ‘Gala’ and ‘Golden’ only. G16 had
better fruit over color than G11 in ‘Fuji’ and no differences were found between the
Geneva rootstocks and M9 T337 in ‘Gala’
The performance of different rootstocks in varying soil conditions
No full textIn 2011, an orchard trial of apple (Malus × domestica Borkh.) rootstocks was established using ’Golden Delicious’ as the scion cultivar. Five rootstock genotypes were planted in previously used rows under different soil conditions: replanted (R), fumigated (F) and free orchard (FOS) soils. The conventional M9 T337 was compared to rootstocks selected by Cornell-Geneva (G.41, G.16 and G.202) and Consorzio Italiano Vivaisti (P21). After five years, tree size was significantly bigger on P21 followed by G.202, G.16 and G.41. M9 T337 had similar vigor as G41. The dwarfed genotypes G.41, G.16 and M9 T337 showed higher yield efficiency over five years than G.202 and P21. Tree size was the highest in FOS followed by trees in F and R soils. Trees on M9 T337 showed a significant growth in FOS compared with trees in F soil. Total shoot growth was higher in FOS and in F soil in the first year only, compared with those in R soil. Trees on P21 showed more shoot growth in two years in F and FOS. G41 increased shoot growth in F only in the first year. Trees in F soil had higher yield only in the second and fourth year than trees in R soil and FOS. Fumigation and FOS did not affect the cumulative yield. Trees on M9 T337 and P21 had lower CY in F soil and FOS respectively
- …
