C1,αC^{1,\alpha} regularity of solutions of degenerate fully non-linear elliptic equations

In the present paper, a class of fully non-linear elliptic equations are considered, which are degenerate as the gradient becomes small. H\"older estimates obtained by the first author (2011) are combined with new Lipschitz estimates obtained through the Ishii-Lions method in order to get $C^{1,\alpha}$ estimates for solutions of these equations.Comment: Submitte

Eigenfunctions for singular fully non linear equations in unbounded domains

In this paper we prove some Harnack inequality for fully non linear degenerate elliptic equations, in the two dimensional case, extending the results of Davila Felmer and Quaas in the singular case but in all dimensions. We then apply this result for the existence of an eigenfunction in smooth bounded domain.Comment: 30 pages 2 figure

Climate Change: EU taxonomy and forward looking analysis in the context of emerging climate related and environmental risks

Climate change is causing substantial structural adjustments to the global economy. Several sectors, such as coal and steel, are undergoing severe problems related to the inevitable transition to a low-carbon economy, while others such as renewables and new environmental adaptation technologies are benefiting substantially. In this context, regulators are beginning to intervene on the legislation, while investors, customers and civil society are looking for alternatives to mitigate, adapt and make these issues more transparent. This article aims to analyze the impact that these changes will inevitably have on banks' balance sheets, introducing new risks but also opportunities. The final purpose is to help banks integrate climate risks into their organizational framework and to provide guidance on the implementation of the recommendations published by the Task Force on Climaterelated Financial Disclosures (TCFD) within the broader Financial Stability Board (FSB) objectives and the UN Environment Finance Initiative (UNEP FI). Starting from a long-term perspective, the work suggests considering climate risk as a financial risk, overcoming traditional approaches that focus on reputational risk. This change implies the integration of climate change risk into the logic of Risk Management (Credit, Market and Operational risks) and a consequent sharing of responsibilities with the structures of Corporate Social Responsibility (CSR). The TCFD recommendations urge banks to use forward looking scenario analyzes, including stress tests, to evaluate and disseminate the "actual and potential impacts" of climate-related risks and opportunities, suggesting in particular to consider the consequences in terms of two categories of risk: physical and transition risk

Bisecting the type series of Leporinus paranensis Garavello and Britski, 1987 (Characiformes, Anostomidae)

The type series of Leporinus paranensis includes two distinct species, one of which is herein described as new. Leporinus paranensis is redescribed based on its holotype, two paratypes, and additional specimens recently sampled in tributaries of the Grande river, in the north portion of the upper Paraná basin in Brazil. A new species of Leporinus is described based on specimens collected in all major tributaries of the upper Paraná basin in Brazil, and tributaries of the Paraná river in Paraguay. Both species share the presence of three unicuspid teeth on the premaxillary and four on dentary, terminal mouth and three dark midlateral blotches on the body. The new species is distinguished from L. paranensis based on the number of scale series around the caudal peduncle (12 vs. 16). The variation in the body shape of both species were compared through a Principal Component Analysis and showed that they share a similar body shape. Species delimitation analyses using DNA Barcode were applied to compare samples of the new species to congeners and corroborated the uniqueness of the new species. In addition, molecular data revealed that L. bahiensis, L. octofasciatus, and L. taeniatus are possibly closely related to the new species. The conservation status of L. paranensis and the new species are discussed using the IUCN criteria

Urinary ethylenethiourea as biomarkers of exposure to ethylenebisdithiocarbamates in floriculture workers in Ecuador

Floriculture represents one of the major sources of income in Ecuador that is one of the greatest worldwide producers of ornamental flowers. Floriculture can be carried out both in open fields and in greenhouses with an extensive use of pesticides, among which, ethylenbisdithiocarbamate fungicides (EBDTCs). Aim of this study was to assess EBDTCs exposure in Ecuadorian floricultural workers by the determination of the urinary excretion of the major metabolite of these compounds, ethylenethiourea (ETU). Thirty-six floriculture workers and 34 unexposed healthy subjects (controls) from an Andean region entered the study. Workers were exposed to EBDTCs while applying plant protection products, and during re-entry activities or crop maintenance in one open field and two greenhouse farms. They provided morning pre-exposure (n=31) and afternoon post-exposure (n=24) urine spot samples. Controls provided one urine spot sample collected in the morning. In agricultural workers median ETU in pre- and after-exposure samples was 3.2 (<0.5-34.5) and 6.2 (1.5-26.5) \ub5g/g creatinine. Although ETU increased after the workshift the difference was not significant. ETU was higher in workers then in controls (0.7, <0.5-7.1 \ub5g/g creatinine, p < 0.01). When subjects were divided according to job titles, applicators showed the highest ETU (17.0, 1.5-34.5 \ub5g/g creatinine) whereas growing, post-harvesting and maintenance workers showed similar levels (4.3, <0.5-26.5; 2.8, <0.5-11.1; 4.8, 3.2-6.5 \ub5g/g creatinine, respectively). Higher ETU was observed in greenhouse compared to open field workers (p < 0.01). This study suggests that Ecuadorian floricultures are exposed to EBDTCs at levels approaching those observed in Italian vineyard workers. The lack of difference between ETU in pre- vs. post-exposure samples is attributable to previous day exposure, in fact the kinetic of excretion is such that in prior to next shift urine significant amount of ETU is still present

A historical vertebrate collection from the Middle Miocene of the Peruvian Amazon

The Miocene aquatic and terrestrial fossil record from western Amazonia constitute a clear evidence of the palaeoenvironmental diversity that prevailed in the area, prior to the establishment of the Amazon River drainage. During the Miocene, the region was characterized by a freshwater megawetland basin, influenced by episodic shallow-marine incursions. A fossil vertebrate collection from the middle Miocene strata of the Pebas Formation is here studied and described. This historical collection was recovered in 1912 along the banks of the Itaya River (Iquitos, Peru), during a scientific expedition led by two scientists of the University of Zurich, Hans Bluntschli and Bernhard Peyer. Our findings include a total of 34 taxa, including stingrays, bony fishes, turtles, snakes, crocodylians, and lizards. Fishes are the most abundant group in the assemblage (~ 23 taxa), including the first fossil record of the freshwater serrasalmids Serrasalmus, and Mylossoma, and the hemiodontid Hemiodus for the Pebas system, with the latter representing the first fossil be discovered for the entire Hemiodontidae. The presence of a representative of Colubroidea in the middle Miocene of Iquitos supports the hypothesis of arrival and dispersal of these snakes into South America earlier than previously expected. This fossil assemblage sheds light on the palaeoenvironments, and the geographical/temporal range of several aquatic/terrestrial lineages inhabiting the Amazonian region

Advanced Photonics Congress

Abstract: We investigated the passivation of III-V semiconductor nanostructures using wet-chemical ammonium sulfide treatment and SiO x encapsulation. We achieved an ultra-low surface recombination velocity value of ~530 cm/s enabling the future development of high-performance room-temperature nanolasers

Triangulation of gravitational wave sources with a network of detectors

There is significant benefit to be gained by pursuing multi-messenger astronomy with gravitational wave and electromagnetic observations. In order to undertake electromagnetic follow-ups of gravitational wave signals, it will be necessary to accurately localize them in the sky. Since gravitational wave detectors are not inherently pointing instruments, localization will occur primarily through triangulation with a network of detectors. We investigate the expected timing accuracy for observed signals and the consequences for localization. In addition, we discuss the effect of systematic uncertainties in the waveform and calibration of the instruments on the localization of sources. We provide illustrative results of timing and localization accuracy as well as systematic effects for coalescing binary waveforms.Comment: 20 pages, 5 figure