An Inversion Theorem for the Singular Integral {P}oisson Equation

The one dimensional Poisson equation governing the electric potential and the charge distributions in a plasma composed of electrons and one species of fully ionized ions is reduced to a singular integral equation. We prove an inversion theorem``which allow us to solve this equation in favour of the distribution function of one of the particle species, chosen according to need, once the electric potential and the distribution of the particle of the other species be given. At variance withprevious results, the unknown distribution function is determined over its whole energy range and it is written as the boundary value of a suitable sectionally analytic function. This fact allows us to extend the distribution function thus found over thewhole complex energy domai

Batti il tamburo e non avere paura.

Batti il tamburo e non aver paura è un verso di una poesia di Heinrich Heine, il maggiore poeta romantico tedesco (ebreo, contrario al pangermanesimo, morto esule a Parigi) che invita tutti al coraggio ed allo impegno, delineando un excursus tra parole chiave della filosofia della scienza e della matematica (in particolare, in Kant, Husserl e Hilbert), per ricavare i moniti alla Geomatica. Infatti questa è costituita da un insieme di discipline scientifiche e tecnologiche che possono offrire benefici al mondo ed alla società, ma causare danni gravi ed è compito dei ricercatori, tecnici, studenti ed operatori fare che scienza e tecnologia siano adoperate ai fini di pace, sviluppo e progresso, e non di guerra, abuso e dominio. Per quanto riguarda i tre studiosi, Kant è preso in considerazione, come geografo (storico e studioso della politica) e come filosofo della scienza e della morale (nelle prime due sue sintesi critiche, seppure della seconda solo brevemente). Husserl e Hilbert (nello ordine un filosofo di formazione matematica ed un matematico, attento a problemi di logica) sono presi in considerazione nelle loro ultime opere, rispettivamente sulla crisi delle scienze europee e sui fondamenti della matematica. Infatti questi due studiosi possono entrambi rappresentare insieme uno dei punti di arrivo delle possibili riletture kantiane e il segnavia per una ripartenza verso nuovi pensieri (rispettivamente la filosofia analitica della conoscenza ed il convenzionalismo critico della matematica)

Sectionally Analytic Distribution Functions of Electron and Ions associated with a BGK wave in a Collisionless Plasma

In this work, we invetigate further the singular nature of the nonlinear stationary solutions of the one dimensional Vlasov-Poisson system of equations, which governs a plasma made of electron and one species of fully ionised ions. First, we propose a new integral formulation of the Poisson equation and we prove two inversion lemmas for such equation. These lemmas allow us to write the solutions of the Poisson equation in such a way that the energy distribution of either of the particle species is related, in a straightforward way, to the energy distribution of the other species. Then, we show that these distribution functions are retrieved as boundary values of suitable sectionally analytic functions. These latter functions are shown tobe the extension of the particle distributions into their respective complex energy domai

The role of nephrectomy in metastatic renal cell carcinoma in the immuno-oncology era

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Su alcuni limiti fondamentali: tecniche non classiche

Si calcola il limite x 0 3 lim x- sinx = 1 → x 6 evidenziando come detto calcolo si possa ricondurre a quello di limiti notevoli senza utilizzare il primo teorema di de l’Hôpital o le classi delle funzioni infinitesime dello stesso ordine. Si prende spunto dal calcolo del limite per riflettere sull'utilizzo, a volte fatto con troppa disinvoltura, della sostituzione degli infiniti e degli infinitesimi. Inoltre si presenta un risultato teorico dal quale discende il suddetto limite e una prova non classica dell’altro limite notevole x lim ln = 0 x x →+∞

Geology, slow-moving landslides, and damages to buildings in the Verbicaro area (north-western Calabria region, southern Italy)

This paper presents a mass movement inventory map at 1:5000 scale of the Verbicaro area (about 13 km2) located in the Calabria region (southern Italy). The Main Map results from the visual interpretation of aerial photographs, multi-temporal geomorphological field surveys, and field investigations of damage suffered by buildings. Some 53% of the study area is affected by a total of 252 landslides, comprising different types, state of activity, and size. The mapped landslides, mainly complex type, involve low-grade metamorphic rocks; among these, 15% are active and slow-move on pre-existing sliding surfaces. Moreover, out of 492 surveyed buildings, 347 are located on landslide-affected areas and experienced damages covering a broad range of severity levels. The Main Map can represent a useful tool for authorities in charge of land-use planning and urban management and can be used to pursue landslide risk analyses

application of a mapping tool to plan energy saving at a neighborhood scale

Abstract This study proposes the application of a model for the evaluation of the overall energy demand of existing urban neighborhoods, which can be useful when planning energy enhancement strategies at urban scale. The application of this model can be interconnected with the use of a GIS software tool, thus providing the opportunity to perform the energy mapping of city neighborhoods. In the proposed model, the overall energy demand of existing urban neighborhoods is evaluated by considering the three most energy intensive sectors: buildings, transport and urban lighting. However, in this paper the application of the model is only focused on the assessment of the energy demand in the building sector. The proposed methodology is applied to a neighborhood of the municipality of Catania in Southern Italy. The preliminary results are reported in this study: first, the existing energy consumption for space heating and electric appliances is assessed, then the effectiveness of a series of energy-saving strategies is considered, thus providing a tool to implement effective energy planning policies at urban scale

A Smart IoT-Aware System For Crisis Scenario Management

In most dangerous events, involving many people in large buildings, rescue workers need to intervene in a timely and targeted manner in order to help most number of people and secure the environments without wasting resources. This work presents an Internet of Things(IoT)-based framework, aiming at monitoring environmental parameters in order to alert rescuers when they exceed some alarm thresholds. A hardware infrastructure driven by a software layer adds flexibility and adaptability to the Complex Event Processing engine and to a rule engine-based reflective middleware that manages and analyzes raw data in conjunction with a knowledge base modeling the application domain

uhi effects and strategies to improve outdoor thermal comfort in dense and old neighbourhoods

Abstract Modelling techniques have received growing attention as a tool to investigate the thermal comfort within a city, on the basis of which decision makers can set-up appropriate mitigation strategies. This research aims at studying the effectiveness of strategies for reducing the urban heat island-associated effects in dense and old neighborhoods considering, in particular, green roofs, cool roofs, cool pavements, green areas and urban renewal actions. Computer simulation was selected as the major methodology in this research; ENVI-met software was used under different scenarios for a case study consisting in an old neighborhood in the city of Avola. The investigation focused on evaluating the efficacy of each strategy for a condition corresponding to a typical summer heat wave. The results highlight that the cool pavements allow relevant improvements at the height of 1.50 m, with a temperature decrease up 1.15°C, whereas the other scenarios, given the relatively high density of the buildings, are able to improve outdoor conditions only at higher elevations. Reported results represent a guideline for the choice of UHI mitigation method that can help stakeholders involved in new urban assessment of old neighborhoods in Mediterranean climate

Evaluation of Protein Carbonyl Content in Healthy and Sick Hospitalized Horses

Literature on the protein carbonyl content (PCC) evaluation in horses is scarce, thus the aims were to evaluate the PCC in healthy and SIRS (Systemic Inflammatory Response Syndrome) horses and to investigate the performances of PCC in terms of sensitivity, specificity, and likelihood ratio in identifying SIRS positive and negative horses. A total of 72 adult horses were included. All the horses underwent to a complete physical examination, blood analysis, and were evaluated for the SIRS status. Blood samples were collected once in healthy horses and at admission time, then 24, 48, 72, and 96 h after admission in sick animals. PCC was evaluated using amethod previously described. Data were statistically analyzed to verify differences in PCC between healthy vs. SIRS positive or SIRS negative horses at all sampling time. The receiver operating characteristic (ROC) curve was performed to verify sensitivity and specificity of PCC in the diagnosis of SIRS-positive and SIRS negative horses. The healthy horses were standardbred mares with a median age of 8.5 years. The sick horses were 31/54 females, 16/54 geldings, and 7/54 stallions of different breeds and with a median age of 12 years old. Eight out of 54 sick horses were SIRS negative, while 46/54 were SIRS positive. Statistically significant differences were obtained between healthy and SIRS positive horses, while no differences were observed between healthy and SIRS negative horses at any sampling time. The best cutoff value of PCC to discriminate between SIRS positive, SIRS negative, and healthy horses, the sensitivity and specificity of cutoff point, the area under receiver operating characteristic curve, the 95%confidence intervals, and the likelihood ratio were reported. We found higher PCC values in sick SIRS-positive horses vs. healthy ones with a decrement over time, while no differences at admission, nor during the observational period, were obtained in sick but SIRS-negative horses. The value of 0.049 nmol/ml/mg is reported as a potential cutoff for the diagnosis of SIRS positivity vs. healthy horses with a sensibility of 74.5% and a specificity of 72.2%. In conclusion, PCC seems to be a sensitive and specific marker for SIRS in horses