HEAT TRANSFER ENHANCEMENT FROM A WIRE TO AN IMPINGING UPWARD SUBMERGED SLOT JET OF WATER IN SUBCOOLED AND SATURATED BOILING CONDITIONS

Experimental data about the heat transfer from a heated 0.25 mm in diameter nickel wire to a submerged upward flow slot jet of distilled water are reported. The tests are carried on in forced convection regime, in sub-cooled and saturated boiling conditions. The influence on the heat transfer rate of different parameters is investigated, such as the jet exit velocity, the distance between the slot exit and the wire and the heat transfer regime, in particular the sub-cooling degree. The choice of the nickel is due to the opportunity to operate in a wide range of the jet exit velocity, thanks to its mechanical and thermometric characteristics. The main aim of this research was to find out the optimal conditions, in order to maximize the heat transfer coefficient enhancement, and moreover, to make a comparison between other results obtained in the 1990s by the same authors on horizontal circular cylinders, with the diameter one size order bigger than the present wire

Gutierrezia mendocina (Asteraceae, Astereae), una nueva especie sudamericana

A taxonomic revision of the South American species of Gutierrezia has revealed a new species from Argentina, characterised by its stems with the base prostrate and rooting, turbinate heads and white ray florets. This species, found in the Department of Tunuyán of Mendoza Province (Argentina), is described and illustrated and a key to differentiate it from allied species is given.En el marco de la revisión taxonómica del género Gutierrezia para Sudamérica fue hallada una nueva especie de Argentina, caracterizada por sus tallos con la porción basal postrada, enraizante en los nudos, capítulos con involucro turbinado y flores liguladas blancas. Se describe e ilustra la especie encontrada en el Departamento de Tunuyán de la Provincia de Mendoza (Argentina), y se incluye una clave para diferenciarla de las especies afines

Sustainability actions in Mediterranean Countries through cooperation partnership: the case of the project PAMLED

In the recent years the involvement of the third countries in achieving the environmental Policy objectives set up by the European Union are becoming more and more important. Several Programs of cooperation co-fund activities and actions to improve the state of the Environment of third Mediterranean partners in order to achieve a global improvement of the environment. This paper aims to present the results of the project PAMLED co-funded by the Med-Pact Programme of the EU. The project will complete its course at the end of April and it aims to develop and strengthen the capabilities of three Mediterranean cities (City of Marrakech - Morocco, Sin El Fil – Lebanon and Bodrum -Turkey) in managing and promoting their local sustainable development, as well as implementing innovative different action fields. The strengthening of the capabilities of these Mediterranean partners was mainly based on the ‘collective learning’, achieved by the constitution of a partnerships with five European partners (Municipalities of: Prato, Lucca, Brtonigla, Rio Marina and Skopje). Needs and priorities of each Mediterranean partner were identified and pilot actions were specifically elaborated in order to promote the sustainable development and the exploitation of local resources, with particular respect to environmental protection, the enhancement of local tangible and intangible assets, economic support and an overall sustainable development The paper will show the outputs of several pilot actions carried out in the three Mediterranean cities involved. The Municipality of Bodrum carried out innovative pilot actions in the field of urban waste management; Sin El Fil developed a pilot project titled “Youth development plan”, while the City of Marrakech carried out a pilot project aimed at sensitizing the local communities and the actors of the touristic sector (e.g. hotels, hammams) on the importance to reduce water consumption.

Non-minimum tensor rank Gabidulin codes

The tensor rank of some Gabidulin codes of small dimension is investigated. In particular, we determine the tensor rank of any rank metric code equivalent to an 8-dimensional Fq-linear generalized Gabidulin code in Fq4×4. This shows that such a code is never minimum tensor rank. In this way, we detect the first infinite family of Gabidulin codes which are not minimum tensor rank

A new family of maximum scattered linear sets in PG(1,q^6)

We generalize the example of linear set presented by the last two authors in "Vertex properties of maximum scattered linear sets of PG(1; qn)" (2019) to a more general family, proving that such linear sets are maximum scattered when q is odd and, apart from a special case, they are new. This solves an open problem posed in "Vertex properties of maximum scattered linear sets of PG(1; qn)" (2019). As a consequence of Sheekey's results in "A new family of linear maximum rank distance codes" (2016), this family yields to new MRD-codes with parameters (6; 6; q; 5)

Model-following control for an oblique-wing aircraft

A variable-skew oblique wing offers a substantial aerodynamic performance advantage for aircraft missions that require both high efficiency in subsonic flight and supersonic dash or cruise. The most obvious characteristic of the oblique-wing concept is the asymmetry associated with wing-skew angle which results in significant aerodynamic and inertial cross-coupling between the aircraft longitudinal and lateral-directional axes. A technique for synthesizing a decoupling controller while providing the desired stability augmentation. The proposed synthesis procedure uses the cncept of explicit model following. Linear quadratic optimization techniques are used to design the linear feedback system. The effectiveness of the control laws developed in achieving the desired decoupling is illustrated for a given flight condition by application to linearized equations of motion, and also to the nonlinear equations of six degrees of freedom of motion with nonlinear aerodynamic data

Tipificación en Gutierrezia (Asteraceae, Astereae)

During the course of the revision of the South American species of Gutierrezia, we have detected names that require typification. After the analysis of the protologues and the herbarium specimens, we designated eight lectotypes and one neotype for nine names of the Gutierrezia genus and we assigned the category of holotype to one specimen. A detailed discussion is provided for each case.Durante el transcurso de la revisión de las especies sudamericanas de Gutierrezia, hemos podido hallar nombres que requieren tipificación. Luego del análisis de los protologos y especímenes de herbario, hemos designado ocho lectótipos y un neótipo para nueve nombres del género Gutierrezia. Además, se asignó la categoría de hólotipo a un especimen. Se provee una discusión detallada para cada nombre

A 2000 Year-Old Cold Case: the Violent Death of a Roman Mariner Between Archaeology and Forensic Anthropology.

During archaeological excavation of the Roman port of Pisa in 1999, two skeletons came to light, laden down by a Roman ship, sunk and partly preserved, probably caused by a disastrous flood in the River Auser. Skeletons belonging to an adult male and a small dog, resembling the present Dachshund breed, were recovered. The canine rested on he man's left upper limb at the forearm level. This 2000 year-old cold case has been investigated using physical and forensic anthropological techniques which allowed us to define the biological profile of this subject: including the sex, age, height and skeletal pathology. The taphonomic analysis of bones and the context as a possible crime scene let us understand the decomposition and death dynamics revealing the causes of the partial dismemberment. The case presented is an example the physical anthropology as a discipline useful for the analysis of skeleton human remains, and as a useful tool in the reconstruction of ancient events and bio-archaeological data in synergy with forensic sciences

Unraveling the Effect of Carbon Nanotube Oxidation on Solid-State Decomposition of Ammonia Borane/Carbon Nanotube Composites

Among the routes to perform hydrogen release from ammonia in solid state, the nanoconfinement into a carbonaceous matrix or the use of carbon-supported catalysts for the thermal degradation of ammonia borane (AB) is the most interesting one. Oxidized carbon nanotubes (CNTs) represent a suitable choice for preparing AB mixtures or for anchoring catalysts for dehydrogenation. Nevertheless, literature lacks detailed study about the influence of CNT oxidation degree on the AB degradation/hydrogen release. In this study, we first described in a comprehensive way that the thermal degradation of AB mixed with CNTs by varying the CNT oxidation degree enlightens the degradative routes mainly active in each case. Using highly oxidized CNTs, we observed a decrement of activation energy of the degradative process up to around 53% and the activation/suppression of different pathways based on the amount of oxygen functionalities present in the mixtures. Furthermore, the presence of oxidized CNTs modulated the solid-state reactivity of AB reducing the release of nitrogen/boron species together with hydrogen. These findings lead the way for the design of new hydrogen storage materials

Sustainable and Resistant Road Infrastructures: The Role of the Envision Framework as a Guide to a New Design Approach

In Italy, resilience and sustainability concepts are generally applied to road infrastructures (mainly in terms of pavements) in order to minimize the environmental impacts of their construction and maintenance. In this paper the Envision framework has been adopted to evaluate the sustain-ability of a road project, optimizing its resilience for both short-term and long-term impacts. The rating approach has been applied considering not only pavements analysis but also the complete project process. The authors have upgraded the original Envision framework to road infrastructures, in compliance with the Italian regulatory framework. Four scenarios have been considered. The first allowed us to understand which credits can be evaluated with the available project documentation. The second represents a snapshot of the state of the project. The third evaluates the effect of the improvement in the performance level obtained by analyzing the potential increases. Finally, the last considers also for “pending” credits