1,721,386 research outputs found
Criteria for improvement and dissemination of Occupational Safety and Health - OS&H Culture in critical NACE sectors
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Robust strategies for lossy quantum interferometry
No full textWe give a simple multiround strategy that permits us to beat the shot-noise limit when performing interferometric measurements even in the presence of loss. In terms of the average photon number employed, our procedure can achieve twice the sensitivity of conventional interferometric ones in the noiseless case. In addition, it is more precise than the (recently proposed) optimal two-mode strategy even in the presence of loss
Studies on Pt-S bonds. Methylsulfanyl-acetato, -benzoato and -phenolato complexes of the Pt((II))(PPh3)(2) and Pt-(II)(dppe) moieties and the crystal structure of bis-triphenylphosphine(methylsulfanylacetato)platinum(II) nitrate
No full textBis-triphenylphosphine and bis(diphenylphosphine)ethane platinum(II) complexes with the chelating anionic ligands methylsulfanyl-acetato (sa), -benzoato (sb) and -phenolato (sph) have been synthesised and characterised. Infrared and multinuclear NMR spectra are in accordance with chelation of these ligands through the sulfur and the anionic oxygen atoms. The structure of [Pt(PPh3)(2)(sa)]NO3 has been determined through X-ray diffraction and confirms chelation of sa. H-1 NMR spectra suggest that the chelate ring in this compound is rigid, with the same conformation found in the solid state, while in the analogous dppe complex both chelate rings undergo inversion of conformation at room temperature. (C) 2001 Elsevier Science B.V. Ah rights reserved
Some results of a modern approach to the Occupational Safety and Health problems
No full textEuropean Directives on OS&H recommend a systematic Risk Analysis of the working activities, whose results should be discussed in some formalized documents. If we consider the Italian situation, at least as resulting from in depth analyses of a number of fatal accidents, the main risk analysis techniques adopted appear based on multi-purpose precompiled forms and Risk matrices deriving from subjective and incomplete assumptions. This is due to a merely formal implementation, heritage of an obsolete prescriptive approach. Hence, the need of a strong contribution to the wide spreading of a Culture of Safety based on study and research in the field of OS&H. Our OS&H research group of Politecnico di Torino, developed and is still working on a well-tested approach covering all phases of Occupational Risk Assessment and Management. The paper deals with some innovative results on Accident Prevention and definition of workers' exposure models in a System Quality approach
Mechanical Comparison Of New Composite Materials For Aerospace Applications
Full text linkComposite materials are becoming the most useful material for aircraft structures. Their main advantage is connected to the possibility of deeply reducing weight and costs by maintaining high performances in terms of strength and security. The second major advantage in using this them depends on the possibility they could be proper designed to guarantee services they are made to. Many ways to combine them lead to the necessity of planning experimental tests in order to evaluate the real both elastic and plastic mechanical properties and to compare their variability as function of the fiber type, matrix type and manufacturing technology involved for realizing them. In this paper, a comparison between two innovative Carbon Fiber Reinforced Plastic materials was done. They differ, one from each other, for the matrix type (PEEK and BENZOXAZINE) and for the manufacturing process used to assemble the matrix with the reinforcement (Compression Molding and Resin Transfer Molding). On the other hand, the resin percentage weight content of both materials is maintained constant for all the tests: it is 42% for PEEK matrix and 64% for BENZOXAZINE matrix. The aim of the work is to critically analyze the results in order to get useful information for choosing the best one intended for designing and making the back section of fuselage of a regional aircraft. The component will consist of a front portion with structural aims (zoom phase) and a back part able to withstand to elevated temperatures
Machine Learning for Bioelectromagnetics and Biomedical Engineering: Some Sample Applications
No full textIn a recent paper we have introduced the use of Machine-Learning to improve the effectiveness of electroporation treatments. On the basis of a wide literature analysis, and after building up a solid knowledge repository, we were able to build up an Artificial Neural Network (ANN) so to predict the impact of the treatment in terms of ablation area. In this paper, we demonstrate that the same approach can be extended so to allow the optimum choice and tuning of some parameters with an important impact on the quality of the treatment, such as the position of the electrodes, their size, geometry, etc. This allows the customization of the treatment to a wider variety of diseases, and its tailoring on specific cases or patients. We finally propose the extension of the ANN approach to a novel application area, extremely important in many biomedical applications: gesture recognition. We demonstrate that the approach, combined with the use of a special glove using chipless RF tags, can be effective in the detection of the movements of fingers in a human hand. For this application, we also investigate some open problems and future developments
The dissemination of the Culture of Safety as an essential tool for the improvement of working conditions and production efficiency: Discussion on the multidisciplinary approach and main sub-topics
Full text linkThis paper deals with the dissemination of the Culture of Safety, a pivotal chain link towards the improvement of the Occupational Safety and Health - OS&H conditions. The Authors discuss the conditions affecting the work-related accidents and health impairments occurrence, together with the relationship between such criticalities and the dissemination of the Culture of Safety. The Culture of Safety still shows serious shortcomings at all levels, and in particular in situations -typically temporary or mobile construction sites and underground activities- characterized by high accident rates all over the world. The Culture of Safety, i.e. "the enduring value and prioritization of worker and public safety by each member of each group and in every level of an organization", gained in the last decades a wide attention in the international literature as a system of organized and systematic knowledge production, i.e. a specific science, for both its importance as a basic asset for prevention, and its typical multidisciplinary characteristics. A challenging and thorough analysis resulted in the proposal of an organic classification of the various aspects of the Culture of Safety into homogeneous sub-categories, precious as a key reading and reference for framing and analyzing in an unbiased approach the OS&H system faults in real cases
The dissemination of the culture of safety: Innovative experiences from important infrastructures and construction sites
Full text linkThe Culture of Safety is the enduring value and prioritization of worker and public safety by each member of each group and in every level of an organization (Von Thaden and Gibbons, 2008). First, the Authors provide some considerations on the roles, tasks and responsibilities of the subjects involved, and reiterate the importance of an approach involving a strong motivation for the figures with real decision-making power. Taken into account what emerged in the International Meeting "the basic role of the clients of great infrastructural operations in the promotion of the Culture of Safety: management and communication strategies, contractual aspects, case histories and best practices", SiTI, Turin, Politecnico, May 12th 2017, the Authors discuss - coherent to the original structured classification of the various aspects of the Culture of Safety into specifically designed sub-categories- the critical Occupational and Community S&H issues, and the responses of the clients
Therapy-resistant cluster headache in childhood: case report and literature review
No full textThe mean age of onset of cluster headache (CH) is in the late third decade. Only few cases of childhood-onset
(<14 years) CH have been reported in the literature. We report the case of an 11-year-old boy who suffered from
sudden attacks of shock-like, intense pain, localized in the right orbital region, with associated photophobia, phonophobia,
conjunctival injection, lacrimation, nasal congestion, rhinorrhoea and psychomotor agitation. The episodes lasted
60–180 min, and the headache frequency was one to three per day. Physical and neurological examinations, magnetic
resonance imaging and blood examinations were normal. The first bout lasted 8 months. Attacks were resistant to every
symptomatic and partially to prophylactic treatment that has been tried. The second bout lasted approximately
2 months
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