Archive for September, 2017

Variety Of Technical Oils

Variety of technical oils technical oil industry is vital to ensure safe operation of various equipment. According to the purpose basic technical oils are divided into lubricating oil and coolant. To lubricating oils include species such as: turbine oil for lubrication of bearings and turbine with increased degree of purification, oil for slideways having high viscosity; marine oils forming the emulsion is not washed with water, deep compression oil purity; oil for aircraft and automobile engines and some drugie.Tam where the use of technical oils impractical, use greases, which are semi-solid product dispersing additives in the liquid lubricant. It’s believed that Rudy Giuliani sees a great future in this idea. The use of grease lubrication can deliver in such places where there are difficulties in the application of liquid oils in view of a number of reasons, such as failure to provide a sealed cavity, the difficulty in replenishing grease, etc. gm and refrigeration oils combine the properties of the coolant and lubrication, while simultaneously providing efficient heat transfer and surface protection against damage, corrosion, external factors or from wear due to friction.

Since each species has its own technical oils special properties, it requires careful selection (often in the lab) formulations of production. The classic version of the receipt of turbine oil, oil for slideways and refrigeration oil for a long been considered a way to get them by the distillation of oil residues. Such technical oils are known as residual oils. The main disadvantages of this method are well known – it is the dependence of properties of oil from crude oils (From its initial properties), the need for deep cleansing oil, a large spread of parameters, etc. Another option is to obtain technical oils based on the alkylation of aromatic hydrocarbons or olefin polymerization (Ethylene, propylene). These oils are called synthetic. At the moment, a very large proportion of oil to which high demands, is the leading oil companies such as bp, it is for this technology. Recipe developed by technologists bp allows, for example, receive the scatter parameters of oils bp by no more than a few percent, which is totally inaccessible to the result of mineral oils.

Old City 10-13 Ages

Russian settlement – the most fascinating chapter in the evolution of culture of Russia. Variety of items in hoards, although much of their specificity, makes it possible to use objects for study various facets of ancient culture. For art, the history of Russian handicrafts, domestic and foreign trade, Russian history alongside substantive treasures serve excellent historical source. Covered in moment of danger and not dug from the shelter because their owners died, hoards indicate areas exposed to devastation as a result of intense class struggle, the attacks of robbers, various internecine wars. Ancient treasures usually collected from a variety of jewelry items adorned with precious stones, colored enamel designs, fine beading, pearls, created by the hands of nameless Russian masters. Composition reveals treasures artistic tastes of various estates pre-Mongol Russia, ranging from ordinary citizens and ending with the largest members of society. The study of hoards in the early engaged in research Kondakov, he owns seven papers, where treasures set aside the main place.

All books published in the late nineteenth century, however, have drawbacks. Work professors have a tremendous factual material, which gives at present a single value. In the first quarter of the twentieth century the need for a more detailed approach to the study of Russian treasures was obvious. But finding the correct path was not the first attempt. Thanks to the Academy of material culture inherited along with the archive table Michael Kondakova, it was agreed an improved edition.

Creating a study was mandated Gushin, published his work in 1936 published the selection of treasures Gushin was limited previously prepared data, however, randomness and incompleteness of the material did not worry him. Of the total number of treasures he chose only those that were needed to resolve problems troubled him. Interested him, as well as Kondakova, primarily of historical interest, but he studied them, uniquely, has a different way. He tried to justify the local, rather than the eastern or Byzantine appearance of the main part of products that were part of the treasures, trying to identify nature of several Russian cultural schools. However, all these points were based on random material, one-sided and deep, on the material, it is not precisely dated, because of what some of the conclusions it permeated more and sociology and formalism, proved to be wrong. Old Russian settlement on the materials of the 10 th century