virtual worlds 2009

Mozilla Firefox Links

cat February 12th, 2012 by Virtual Keeper

Before explaining how it is measured, see a little what is popularity. Popularity is a concept that for some time been talking about, especially those who are dedicated to making sites SEO-optimization-y. It happens that algorithms, complex mathematical calculations, using search engines to index positioning compose your site, and especially its Google Pagerank, contemplate the popularity of the site, to ascribe the index where it will finally appear when a user search. It turns out that for quite some time now, Google does not include the keywords, ie, ignore the code snippet that contains (for example), which does not mean it's a good idea to put the keywords in the programming of web pages. Google ignores them, but other search engines or directories, if they consider. Google takes into account two important factors: the textual content (the text that is included on the site) and popularity, measured in number of incoming links that the site may have.

Much larger number of sites likeen to a page, higher its popularity. But, not all incoming links are equal. The higher the Pagerank of the site that links us, the higher will be ours. Penalized sites, such as link farms, have zero PageRank. This will damage our Pagerank, because it computes the zero with the rest of the other PageRanks, and ultimately hurts us (as when at school we have two tens and a zero, the average is six to sixty-six, that is, detracts totally we had good grades). But as a link from a page with PR of zero harm us, a very good link from a site with a PR higher than'm just linking to us, we benefit greatly. Notably, the PR is a scale (obtained from another complex calculation that Google applies) that goes from zero to ten, the latter being obviously the highest.

There are some plug-ins specifically for Mozilla Firefox, or toolbars for browsers, which provide the PR of each site you visit. In Consequently, the Internet is a democratic entity, ie, the vote of peers helps better position. But the reality is aristocratic, because not all votes are equal. From this comes the concept of "quality links", namely those that satisfy two conditions: they are "dofollow" (an attribute that is dumped into the site code) and high PageRank sites. Again, then, we find the premise that "little but good is better than much and bad." Some external links on quality can do miracles for our search engine optimization. How to get quality incoming links, and thus to promote our position on search engines? That, we leave for another posting. If you liked this post and wants to put in place, you can smoothly, provided you cite as a source

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PVC Welding

cat February 3rd, 2012 by Virtual Keeper

Welding film – is the basic approach of polyethylene compounds. Welding of PVC – a technology for permanent connection with diffusion bonding or chemical welding of geomembranes, resulting in a junction between the joined surfaces of polyethylene film disappears and turns the transition from one part to another. Plastic film is characterized by high heat and very low thermal conductivity. Therefore, welding of polyethylene the film is carried out at temperatures at which the plastic film is a plastic. The quality of the seam, which is obtained by plastic welding, depending on its composition, conditions of the welding process. Of large amount of welding of polyethylene is most often used is the thermal contact welding.

Contact-welding heat – it's fairly simple and low-cost method, which ensures a fairly high characteristics of compounds of polyethylene films. At the moment, the most common and well-welded contact and heat welding are PP (polypropylene), LDPE (low-pressure polyethylene), LDPE (polyethylene high blood pressure). These materials are characterized by relatively low temperature fluidity (125-170 C), a large temperature range of visco-fluid state (above 55 C), a rather low melt viscosity. Therefore, HDPE, PP, LDPE refer to polymers that are well welded. When welding PVC heater could come into contact with the inner surfaces as well as with external (fusion welding and weld penetration, respectively). Welding geomembrane thickness of 150 microns is obtained by the best technology, supply of thermal energy from one side. Welding of the film pressure of 25-100 microns thick film takes place at about 210 C and the tool length contact 0, 5-0, 6 seconds. Welding of low pressure polypropylene film thickness of 25-100 microns is conducted at a temperature of 240 C and a tool contact time 0, 55-0, 68 seconds. Welding of polyethylene film thickness of 25-100 microns is carried out at tool temperature 240 C and a contact time of 0, 6-0, 75 seconds.

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