Oracao infantil ao Anjo da Guarda Meu anjo da guarda,dourado como o sol, suave como a lua,segue-me quando eu for a escola, quando estiver em casa, quando brincar na rua...Vela meu sono de noite, guia meus passos de dia; da-me tua paz, teu carinho, tua alegria...Quero estar sempre em tua companhia.Voce e tudo para mim.Quero aprender com voce a amar as plantas, os minerais, as pessoas, os animais...A ter bons sentimentos, pensamentos puros, enfim,a amar a Deus sobre todas as coisas. Depois de muito tempo sem aparecer por aqui... uma alegria repentina tomou conta de meu ser e resolvi ativar novamente este blog, com muitas ideias na cabeca... vou compartilhar com voces muitas atividades bacanas para fazer com seus pequenos...Esse blog surgiu por conta de minha neta... ela esta linda, inteligente e esta com 5 aninhos.Novos tempos para "nos"...Espero que todos que me seguem estejam bem... agradeco por estarem aqui comigo... fiquem em Paz, voltarei ja, ja, ja...Bjcas Graca Tomorrow, 11/25/11, I will do a job interview in a company that produces polyethylene foams. I know nothing about foams and, because of this, I decided to make a composition about this. I need to learn it and I need to make a composition, so let's unite the useful with the useful!The interview will be in English!It would be wonderful working in a place where I could speak in English all the time to practice what I have been learning!So... What is a polyethylene foam?Polyethylene is a thermoplastic material and it is produced through polymerization of ethylene (chemical formula: CH2=CH2). It is the simplest polymer and the cheapest polymer, due to its high global production.Polyethylene can be produced through different polymerization reactions and each of these reaction mechanisms produces a different type of polyethylene:- LDPE (low density polyethylene): nontoxic; flexible; light; transparent; inert and waterproof.- HDPE (high density polyethylene): resistant to low temperatures; high tensile strength, compression and traction; waterproof, inert and nontoxic.- LLDPE (linear low density polyethylene).- UHWPE (ultra high molecular weight polyethylene).As foam, polyethylene is used in packaging, vibration damping and isolation (thermal and acoustic), as a barrier or buoyancy component, as material for cushioning, or as fencing. In many segments: automobile, agricultural, building, electronic, military, naval, hospital, footwear, and sports and leisure.The foam properties depend on its density and its cellular structure. That means that the quantity of closed and opened cells, the distribution and size of the cells are very important for the polyethylene foam properties.Polyethylene foam is above all produced through extrusion technologies. The foams are made by first dissolving and mixing a gas in the molten polyethylene, secondly expanding the gas into a lot of small bubbles or cells and finally cooling the expanded polyethylene and thus creating the final foam.The expansion results in a reduction of the polyethylene density. The foam can be molded in many different semi-finished products as tubes, profiles, sheets and blocks.There aren't pores or interconnected cells in closed cell foam. By contrast, in the closed cell foam, the cells of the material are separated by sealed elements placed in a compact configuration