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Franzetti A.,University of Milan Bicocca | Gandolfi I.,University of Milan Bicocca | Raimondi C.,University of Milan Bicocca | Bestetti G.,University of Milan Bicocca | And 5 more authors.
Bioresource Technology | Year: 2012

The aims of this work were the characterisation and the evaluation of potential environmental applications of the bioemulsifiers produced by Variovorax paradoxus 7bCT5. V. paradoxus 7bCT5 produces a mixture of high molecular weight polysaccharides. The extracellular bioemulsifiers were able to produce a thick stable oil/water emulsion and maintained the emulsification activity after boiling and at low temperatures. Environmental behavior and impact of bioemulsifiers release were assessed by evaluating biodegradability, toxicity and soil sorption. Respirometric tests showed that moderate biodegradability occurred by soil bacterial inoculum. Furthermore, the produced compounds did not show any toxic properties through different ecotoxicological tests. The K d values ranged from 1.3 to 7.3L/kg indicating a high sorption affinity of the bioemulsifier molecules to soil particles. The soil sorption affinity likely affected the bioemulsifier ability to remove hydrocarbons from contaminated soils. In fact, V. paradoxus 7bCT5 bioemulsifiers significantly increased the removal of crude-oil from sandy soil compared to water. © 2012 Elsevier Ltd. Source

Materials at High Temperatures | Year: 2010

New non-destructive examination methods have been available for many years. These include time of flight diffraction and phased array methods. These are routinely used for inspection of welds. Work is ongoing at ISO and CEN for standardization of these methods. First the time of flight diffraction was drafted and now ISO and CEN are working on a standard for phased arrays. These drafts are used for welding inspections. The acceptance criteria is in draft form for time of flight diffraction which will be followed by that for phased array. Standards are already available for base material phased array inspection such as the ASTM document ''Standard Guide for Evaluating Performance Characteristics of Phased Array Ultrasonic Examination Instruments and Systems''. Several ASME code-cases have been issued in recent years on weld inspection. Qualification for the ASME code is also planned for this novel technique. © 2010 Science Reviews 2000 Ltd. Source

The 81/08 Decree gives a strategic role to the processes that provide information, knowledge and training, regarded as fundamental measures to improve health and safety conditions in the workplace. The most important aim of health and safety training is to acquire skills to carry on duties according to safety principles in the company. Competence consists of the possession and application of integrated knowledge, skills and behaviors. To achieve these results, it is essential the desire of the organization, at all levels, to invest on learning and development, highlighting the benefits arising from the adoption of safe behavior by workers. Different methodologies contribute to this aim, including those developed within the behavioral sciences, such as the BehaviorBased Safety (B-BS), which is based on the development of safe behaviors, through the implementation of a registration system for behavior, feedback and positive consequences. This report will make a comparison between the elements that characterize health and safety training provided by the D. Lgs. 81/08 and the enforcement of protocols for B-BS in companies. © PI-ME, Pavia 2010. Source

Traversi D.,University of Turin | Villa S.,University of Turin | Acri M.,SMAT S.p.A. | Pietrangeli B.,ISPESL | And 2 more authors.
AMB Express | Year: 2011

Methanogen populations and their domains are poorly understood; however, in recent years, research on this topic has emerged. The relevance of this field has also been enhanced by the growing economic interest in methanogen skills, particularly the production of methane from organic substrates. Management attention turned to anaerobic wastes digestion because the volume and environmental impact reductions. Methanogenesis is the biochemically limiting step of the process and the industrially interesting phase because it connects to the amount of biogas production. For this reason, several studies have evaluated the structure of methanogen communities during this process. Currently, it is clear that the methanogen load and diversity depend on the feeding characteristics and the process conditions, but not much data is available. In this study, we apply a Real-Time Polymerase Chain Reaction (RT-PCR) method based on mcrA target to evaluate, by specific probes, some subgroups of methanogens during the mesophilic anaerobic digestion process fed wastewater sludge and organic fraction of the municipal solid waste with two different pre-treatments. The obtained data showed the prevalence of Methanomicrobiales and significantly positive correlation between Methanosarcina and Methanosaetae and the biogas production rate (0.744 p < 0.01 and 0.641 p < 0.05). Methanosarcina detected levels are different during the process after the two pre-treatment of the input materials (T-test p < 0.05). Moreover, a role as diagnostic tool could be suggested in digestion optimisation. © 2011 Traversi et al; licensee Springer. Source

International Journal of Pressure Vessels and Piping | Year: 2010

EN12952-4 provides a method for calculation of in-service low cycle fatigue damage. The procedure describes the calculation of low cycle fatigue damage of boiler components during operation. Temperature, pressure, temperature differences, strain, etc. are considered in the determination of actual damage level.The EN12952-4 also includes creep calculation and creep-fatigue combined calculation, but this part, essential for Remaining Life Assessment, it is not in the scope of this paper.The European standard provides also calculation examples, even if only by computer data logging system it is possible to apply the procedure.Fatigue calculation, as well as creep and creep-fatigue calculation, is essential for modern HRSG plants, where the changing of operational conditions is quite often applied. © 2010 Elsevier Ltd. Source

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