149 research outputs found
The Multivariate Mixture Dynamics Model: Shifted dynamics and correlation skew
The Multi Variate Mixture Dynamics model is a tractable, dynamical,
arbitrage-free multivariate model characterized by transparency on the
dependence structure, since closed form formulae for terminal correlations,
average correlations and copula function are available. It also allows for
complete decorrelation between assets and instantaneous variances. Each single
asset is modelled according to a lognormal mixture dynamics model, and this
univariate version is widely used in the industry due to its flexibility and
accuracy. The same property holds for the multivariate process of all assets,
whose density is a mixture of multivariate basic densities. This allows for
consistency of single asset and index/portfolio smile. In this paper, we
generalize the MVMD model by introducing shifted dynamics and we propose a
definition of implied correlation under this model. We investigate whether the
model is able to consistently reproduce the implied volatility of FX cross
rates once the single components are calibrated to univariate shifted lognormal
mixture dynamics models. We consider in particular the case of the Chinese
renminbi FX rate, showing that the shifted MVMD model correctly recovers the
CNY/EUR smile given the EUR/USD smile and the USD/CNY smile, thus highlighting
that the model can also work as an arbitrage free volatility smile
extrapolation tool for cross currencies that may not be liquid or fully
observable. We compare the performance of the shifted MVMD model in terms of
implied correlation with those of the shifted Simply Correlated Mixture
Dynamics model where the dynamics of the single assets are connected naively by
introducing correlation among their Brownian motions. Finally, we introduce a
model with uncertain volatilities and correlation. The Markovian projection of
this model is a generalization of the shifted MVMD model
DIAGRAMMA DI FASE DI ELETTRONI IN PIANI ACCOPPIATI
1994/1995VIII Ciclo1967Versione digitalizzata della tesi di dottorato cartacea
Ampliamento del Parco Giardino delle Kentie a Riposto
La conformazione recente del Parco è il frutto di un progetto realizzato agli inizi degli anni ’90 sulla scorta di un piano che prevedeva la sistemazione di un terreno di proprietà comunale sulla quale insistevano dei filari regolari di Kentie, il cui impianto è risalente ai primi anni del Novecento
Exploring the thermodynamic limit of Hamiltonian models: convergence to the Vlasov equation
We here discuss the emergence of Quasi Stationary States (QSS), a universal
feature of systems with long-range interactions. With reference to the
Hamiltonian Mean Field (HMF) model, numerical simulations are performed based
on both the original -body setting and the continuum Vlasov model which is
supposed to hold in the thermodynamic limit. A detailed comparison
unambiguously demonstrates that the Vlasov-wave system provides the correct
framework to address the study of QSS. Further, analytical calculations based
on Lynden-Bell's theory of violent relaxation are shown to result in accurate
predictions. Finally, in specific regions of parameters space, Vlasov numerical
solutions are shown to be affected by small scale fluctuations, a finding that
points to the need for novel schemes able to account for particles
correlations.Comment: 5 pages, 3 figure
Systemic candidiasis in farm-reared red-legged partridges (Alectoris rufa) caused by Leucosporidium spp
BACKGROUND: This report describes the results of radiological, histological and molecular examination of three farm-reared red-legged partridges (Alectoris rufa) affected by candidiasis. CASE PRESENTATION: Three juvenile farm-reared red-legged partridges in a batch of 100 of the same species were sent for clinical and pathological investigations. The owner referred of a sudden isolation of the sick animals, with apathy, diarrhea, ruffled plumage and respiratory rattles. Post mortem total body lateral projection radiograph showed an increased perihilar interstitial pattern and air bronchogram signs due to lung edema. At necropsy, carcasses showed cachexia; the pericloacal region was soiled by diarrheic fecal material. From the mouth to the intestine, a mucous yellowish fluid was present on a slightly reddish mucosa. Histopathology showed slight edema and congestion with different free fungal elements, referable to blastospores, hyphae and pseudohyphae. Biomolecular exam identified the most similar sequences as belonging to Leucosporidium scottii. CONCLUSION: To our knowledge, this case report describes for the first time this fungal species as a causative agent of candidiasis in birds
Short-term use of dexamethasone/netilmicin fixed combination in controlling ocular inflammation after uncomplicated cataract surgery
Purpose: To evaluate the short-term anti-inflammatory effect of dexamethasone/netilmicin fixed combination in the management of ocular inflammation after cataract surgery. Patients and methods: Open-label, randomized, active-controlled, clinical study conducted in 6 sites in Italy; 238 patients were randomized 2:1 to dexamethasone/netilmicin (dexa/net, n=158) or betamethasone/chloramphenicol (beta/chl, n=80). Treatment started the day of surgery and continued 4 times daily for 7 days. The primary efficacy parameter was the anterior chamber (AC) flare. The percentage of patients displaying none or mild (ie, only barely detectable) AC flare was defined as "efficacy rate", whereas the percentage of patients showing a decrease of AC flare score from baseline was defined as "percentage of responders". Additional parameters evaluated were AC cells, conjunctival hyperaemia, corneal and lid oedema, symptoms of ocular discomfort, visual acuity, and intraocular pressure. Dexa/net was considered effective if the efficacy rate was not inferior (by means of 97.5% confidence interval) to that of beta/chl. Results: After 7 days of treatment, no AC flare was observed in 92.8% (dexa/net) and 92.3% (beta/chl) of patients, whereas no AC cells were observed in 91.5% (dexa/net) and 93.6% (beta/chl) of patients, respectively. The "efficacy rate" was 100% in both groups, whereas the "percentage of responders" was 94.1% in the dexa/net and 93.6% in the beta/chl group. The p-value to reject the null hypothesis of inferiority was <0.001. Other efficacy parameters confirmed both treatments as highly effective, despite their difference in steroid content (2 mg/mL for beta/chl vs 1 mg/mL for dexa/net). IOP and visual acuity at the end of the study were comparable. Two cases of allergic conjunctivitis were considered adverse events and were both related to dexa/net. Conclusion: Short-term use of dexa/net fixed combination is safe and effective in the control of post-operative inflammation following uncomplicated cataract surgery
Cerebrospinal Fluid Pressure-Related Features in Chronic Headache: A Prospective Study and Potential Diagnostic Implications
Objective: To identify the pressure-related features of isolated cerebrospinal fluid hypertension (ICH) in order to differentiate headache sufferers with ICH from those with primary headache disorder.Methods: In this prospective study, patients with refractory chronic headaches and suspected of having cerebrospinal fluid-pressure elevation without papilledema or sixth nerve palsy, together with controls, underwent 1-h lumbar cerebrospinal fluid pressure monitoring via a spinal puncture needle.Results: We recruited 148 consecutive headache patients and 16 controls. Lumbar cerebrospinal fluid pressure monitoring showed high pressure and abnormal pressure pulsations in 93 (63 %) patients with headache: 37 of these patients with the most abnormal pressure parameters (opening pressure above 250 mm H2O, mean pressure 301 mm H2O, mean peak pressure 398 mm H2O, and severe abnormal pressure pulsations) had the most severe headaches and associated symptoms (nocturnal headache, postural headache, transient visual obscuration); 56 patients with the less abnormal pressure parameters (opening pressure between 200 and 250 mm H2O, mean pressure 228 mm H2O, mean peak pressure 316 mm H2O, and abnormal pressure pulsations) had less severe headaches and associated symptoms.Conclusions: Nocturnal and postural headache, and abnormal pressure pulsations are the more common pressure-related features of ICH in patients with chronic headache. Abnormal pressure pulsations may be considered a marker of ICH in chronic headache
Pallister–Killian syndrome: Cytogenetics and molecular investigations of mosaic tetrasomy 12p in prenatal chorionic villus and in amniocytes. Strategy of prenatal diagnosis
Abstract Objective Pallister–Killian syndrome (PKS) is a rare, sporadic genetic disorder caused by mosaic tetrasomy of the short arm of chromosome 12 (12p). Clinically, PKS is characterized by several systemic abnormalities, such as intellectual impairment, hearing loss, epilepsy, hypotonia, craniofacial dysmorphism, pigmentary skin anomalies, epilepsy, and a variety of congenital malformations. Prenatally, PKS can be suspected in the presence of ultrasound anomalies: diaphragmatic hernia, rhizomelic micromelia, hydrops fetalis, fetal overweight, ventriculomegaly in the central nervous system, congenital heart defects, or absent visualization of the stomach. In all these cases, a detailed genetic study is required. PKS is diagnosed by prenatal genetic analysis through chorionic villus sampling, genetic amniocentesis, and cordocentesis. Case Report We report two cases of PKS with prenatal diagnosis of isochromosome 12p made by cytogenetic studies. The first case is of a 36-year-old pregnant woman who underwent genetic chorionic villus sampling at 13 th weeks of gestation after 1 st trimester prenatal ultrasound revealed clinical features of PKS: flat nasal bridge and fetal hydrops. The second case is of a 32-year-old pregnant woman with genetic amniocentesis at 17 th weeks of gestation that showed mos46,XX[21]/47,XX,+i(12p) associated to PKS. Conclusion New molecular cytogenetic techniques array comparative genomic hybridization and fluorescence in-situ hybridization in association with conventional karyotype are pivotal innovative tools to search for chromosomic anomalies and for a complete prenatal diagnosis, especially in cases such as PKS where array comparative genomic hybridization analysis alone could not show mosaicism of i(12p)
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