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TRIBOLOGY: TRIBOLOGY



This scheme represents an intermediate state between boundary lubrication and hydrodynamic mechanism by which all pass before reaching this condition. In this case, part of the surface roughness of both mechanisms are inserted so that only part of the burden is borne by the hydrodynamic action and the other by the boundary film that covers the irregularities of both surfaces.

An incorrect selection of oil, as well as a decrease in viscosity, may lead to the mechanism is operating under these conditions. In this case, the lubricant film thickness is equal to the average roughness of both surfaces and not enough to obtain a laminar flow. See Fig. (A) and (b). For

cylinder internal combustion engine, where the present conditions of boundary and mixed film in the top and bottom dead spots, respectively, the incorporation of additives to oils unctuous base (during the manufacturing process) to ensure a better fixing of the oil film on the surfaces, or use of solid film lubricants (graphite or molybdenum disulfide), relatively insensitive to temperature and can form resistant layers and good rubbing permanence, can reduce a significant proportion wear in regime (fully loaded) and adhesive wear at startup. The figure shows these decreases in wear from five successive trials in a single-cylinder gasoline engine, the addition of graphite or MoS2 to a pure mineral oil and oil additives.




course, the benefit obtained with the addition of a solid film lubricant base oil, in terms of adhesive wear should not be offset by the potential risks that would result from a greater tendency to deposit formation as a result of insufficient stability of the suspension of solid lubricant base oil to be centrifuged at the elbows of crankshaft or passing through the filters of the lubrication circuit. However, current techniques of preparation and selection of these products and stabilization of suspensions suitable dispersant additives, SENCIBLES reduce these dangers. Whenever these conditions are met, these products can provide effective protection during the shooting and lead to surfaces that have a low coefficient of rubbing and whose subsequent wear are weak.

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celebrate in 2011 the International Year of Chemistry , 63, proclaimed by the UN General Assembly, under the slogan: " Chemistry: our life, our future ." It also marks the centenary Nobel Prize in Chemistry awarded to Marie Curie therefore no longer an opportunity to celebrate and highlight the contributions of women to science

From the earliest times with the use and control of fires, with the preparation of the first alloy of the history, chemistry has been present in the development and evolution of humanity and just look around to see who is everywhere: our body, the clothes we wear, what we eat, everything is made of matter consisting of molecules. In short, everything is " Chemistry: our life, our future ."

However, the educational administration remains committed to maintaining the science away from the Elementary and Secondary Education. It has been five years since the APCCC saw the light and, although it may seem otherwise a look at the booths, science teaching are feeling the same problems we denounce in 2006: No spaces or material to develop practical activities in primary education. The labs are closed on High, for lack of time and teachers to teach splittings, which does not happen in other regions. Moreover, the Andalusian students 15 years get the worst scores in the PISA tests, at the State level, there are fewer scientific vocations and our students entering university with a poor scientific training. Finally, the schedule is insufficient scientific subjects in secondary and inferior to the rest of Europe, with optional at 4, holding an absurd gap between Arts and Sciences is creating a high scientific illiteracy.

Our goal, as an association, is improve scientific culture of citizens and for this, we demand a greater presence of science in our schools and colleges. To achieve this, we have proposed to the Education Authority in the following steps repeatedly, to no avail:

• Provide resources and spaces with primary schools to carry out scientific experiments.
• Reduce the number of students in all areas of Teaching Secondary or establish splittings of practice, as in many Autonomous Communities.
• increase to three sessions weekly schedule of the subjects of Biology and Geology / Physics and Chemistry of 3 º ESO, separated for the purposes of evaluation. Include
• Science as compulsory subjects in 4 º ESO, with two levels of depth, depending on the difficulties of students.
• Set as mandatory on 1 st of Bachelor of Science and Engineering, the subjects of Physics and Chemistry and Biology and Geology, to get a solid scientific background of all students, regardless of further studies. Encourage
itineraries
• 2 of Bachelor of Science and Engineering to allow the student to access the first course of the Schools and Colleges with basic training in all scientific areas.

CÓRDOBA TEACHERS ASSOCIATION FOR SCIENTIFIC CULTURE.