Design study of space stations of various types in recent years engaged quite actively. In particular, several options have been considered by various American companies. This is a great base-station weight Hundreds of tons, designed for a crew of 50-100 people. At the stations planned to create artificial gravity, and to supply electricity to provide nuclear power plant. The central issue in the creation of major stations – is the choice of the optimal form and methods of assembly in orbit. The views of experts agree that the base-station will be collected from several types of blocks of various sizes. The station can take the form of the torus, hub with the blades, stars, wheels, weights and other forms to help you easily implement the rotation of the station, at the expense of which will be an artificial gravity. Establishment of large plants will require effective methods of installation in space, the choice of rational methods of approach and docking. In this sense, is of interest to build blocks of the station with a special vehicle-towing. Set of complex automated apparatus, with which the search launched on the block, capture it and joining with other blocks in this case will be set only by boat-towing. The blocks will have a simplified apparatus, that drastically reduce their cost. The ship towing can be equipped with fully automated control system, remote control from Earth or from onboard the space station and to assemble in space without a human presence. The variant of towing with manual control.
Tag: Technology
Still possible to allocate such applications of polypropylene sheets, such as: formwork, elements of decorative design, Signs, plates, coasters, visors, swimming pools, etc. And separately I must say the wide application of pp sheets in the manufacture of stationery products: pencil cases, folders, files, notebooks, organizers, folders, envelopes, cases, as well as advertising and printed materials: posters, covers, business cards for better print quality polypropylene sheets are processed on both sides of a special corona, and a logo, a diverse symbols, commemorative and dedicatory inscriptions possibly using hot embossing, laser engraving, screen printing, etc. In carrying out construction works with polypropylene sheets, note that they special properties that distinguish them from conventional structural materials. Sheets of polypropylene can be cut, milled, planed, or expose them to the processing machines of the same or similar to those used for wood processing. Linking polypropylene sheets can be mechanically with rivets or bolts. It is necessary to bear in mind the propensity of the material to the linear expansion. Although such a connection is split, it is not has waterproof qualities, in some cases, it is still not strong enough, so is not very suitable for the connection of polypropylene parts. Inappropriate in certain situations is also considered connection with glue – bonding. Polypropylene has excellent chemical resistance, and therefore may be in contact with many soluble glues. The most profitable and reliable, and, consequently, the most frequently used method of connecting parts of polypropylene is welding. Currently, three known welding method. Highest quality – welding.
In many cases, the deposited aluminum can be left unprotected, without the use of impregnation. The use of aluminum alloy with 5% magnesium is a great alternative to coating with paint. This alloy is an effective coating for offshore platforms and components that are on deck. Thermally sprayed aluminum is well used for factory equipment operating at high temperatures. When using epoxy impregnation, the coating can withstand up to 5000S, using silicone impregnation – a higher temperature.
In contrast to the coverage surface of the paint coated products Spramet can be used almost immediately after application. Still less damage during operation will be, if coat the individual parts in the production process that allows the sprayed coating to any part of the product and makes it possible to assemble the product after completion or after the repair. The study of the corrosion process by the American Welding Society for 19 years in 1974, the American Welding Society has completed the 19-year study of corrosion protection, zinc and aluminum sputtering coatings on steel with low carbon content. The results of this study the following: aluminum coating thickness of 0.08-0.15 mm, as with the use of impregnation, and without it, provide complete corrosion protection of the base metal for 19 years in sea water and in harsh marine and industrial atmosphere; Zinc coverage without the use of impregnation should be 0.30 mm thick in order to ensure full protection of the surface in sea water for 19 years. In a tough marine and industrial atmosphere, zinc coating thickness of 0.23 mm without of impregnation and 0.08-0 .. 15 mm using impregnation, provide corrosion protection for 19 years in the harsh conditions of the marine atmosphere exposure, apply a layer of wash solution and add 1-2 layers vinyl aluminum. This will improve the appearance of the product and prolong the life of the zinc coating is nearly 100%.
Seam roof and its advantages: ease of material (1m2 weighs between 3 – 7 kg) does not require a particularly strong truss system; Prolonged operation of roofing, (decades) Good anti-corrosion metal mounting modern methods – fast and more reliable, this choice of material – is huge, its color and style can not fail to please!; seam roof and its shortcomings: The virtual absence of sound insulation, high thermal conductivity of the roofing material, depending on the material – high prices, the (relative). Seam roof, is the type of lock which connects the two parts of pictures (single or double rebate) for this purpose faltseprokatny machine. The picture is called, roofing, made of sheet material. Seam roof, consists of paintings (recently – tape) This is a roll material cut to the length of the roof slope, passed through faltseprokatny machine. At the output we have a picture, prepared under the (usually) a double standing seam. In this case, the seam is a seam pattern.
Seam roof is made with the use of the machine can faltseprokatnogo installed as a stand-up and bed-fold. According to the technology used on roofs of both of these types of connections. For example standard: standing seam, the seam is located along the (vertical) slope of the roof connecting the picture. Recumbent fold – this connection is a horizontal painting. Faltseaya roof connected to a double standing seam – provides almost 100% protection against leaks! Old days are gone, they were replaced, modern semi automated. Now cover large areas of the roof does not take much and the quality of work in a hundred times safer, faster, better. How did this all happen? All work is done with the help of special roofing tools. Here is a sample machinery manufacturing standard seam roof: Suppose you want to cover a large area of relatively flat area of the stationary roof.