Yalnizca

The World and Modern Science

  • Jul 11

    This question has long been concerned about the minds of many people. Why namvoobsche need it? The answer is simple – roughly the same reasons for which chelovektak tried to land on the moon. And finally achieved it. First of all, etootlichny way check the level of our technology in space. Secondly, Mars – the great testing ground for research. Tolkodobravshis to the red planet can fully explore its environment sredui, Finally, to prove or disprove the existence of bacterial life on the planet. Obstacles. The main obstacle flight to Mars is, of course, distance.

    Distance from Earth to Mars is 54.6 million miles. But stoituchityvat, because of the constant motion of the planets in their orbits vokrugSolntsa, this distance increases. Ate to compare with the flight to the moon, dokotoroy approximately 384,403 km., We can conclude that fly to Mars by about v142 further. This means that, for example, the spacecraft "Apollo" (amerikanskayaprogramma flight to the moon) would reach the orbit of Mars, at best, a 426 dneyposle start. Then as he got to the moon in just 3 days. Of course, you can not neotmetit that technology is not standing still and we have advanced considerably since 1969 Soglasnoissledovaniyam conducted by nasa, modern space apparatysposobny reach the red planet for about 6 months. But we need not just to reach Mars and land a nanego researchers astronauts. The process of delivery – the second sereznayatrudnost.

    After all, they require at least minimal conditions .Eda, oxygen, sleep, etc. To overcome such a distance and deliver vsegoneobhodimogo cargo spacecraft needs bolshomkolichestve enough fuel. Even if the basis for calculations to take nasa in such circumstances would be the hardest test for themselves astronavtov.Ved, they will have to live in a small closed room for six months. To date, we already have the necessary technology to puteshestviyana Mars. Some scholars even argue that today's Earth's inhabitants stanutneposredstvennymi witness it. According to various estimates, as the launch date for 2040-2050gody. Many writers such as Grace Venverloh offer more in-depth analysis. But whether it is justified? Probably yes, in fact, the mission to the moon bylapriznana quite successful.

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  • Aug 2

    A small series of machine beds is at PSI in use recently. They have a length of almost five meters 1 and a weight of 4,400 kilograms. Absolute stability for that matter The challenges are to be mounted components, as well as the absolute stability of precision for the project in the high functionality”, explains Dr. UTZ-Volker Jackisch, Managing Director of EPUCRET mineral casting technology. The girder must be vibration-damping, afford a natural frequency of 40 Hz, have a good stiffness and also it should have a precise surface. Non-magnetic properties, high temperature stability are also in demand and the costs must remain within the framework. The girder will be transported well with pre-assembled components.

    Especially the vibration damping, rigidity and thanks to grinding possible accuracy of 10 m over a length of 5 meters have convinced the PSI. Another plus was the integration potential of mineral cast. So, about Rails were used to enable a variable design of the components. Are to absolutely avoid interference due to the frame in this research project, is Mineral cast also because of its non-magnetic property and corrosion resistance suited”added Jackisch. Mineral cast shows with high dynamics its strengths we had to mainly consider how we bring the static, dynamic and thermal behavior of the injector in accordance. In principle we had”the advantage of that mineral cast shows its strengths in high dynamics, describes Marc Dizdarevic, responsible for the technical sales and maintainer of the project at EPUCRET mineral casting technology.

    Mineral cast dampens the vibrations and noise emissions reduced. Mineral casting has up to ten times better material damping as cast or welded frame materials”, then Daniel. Body sound analysis shows also the reduction of sound pressure level of more than 20 percent. But also the high specific heat capacity and low thermal conductivity of 2.9 W / mK making mineral cast the first choice for the experts from the Switzerland. Both properties cause a sluggish behavior at the material to short-term temperature fluctuations. In addition, warming or cooling actuators can be integrated into the mineral cast frame. The above characteristics of mineral cast high natural frequency and damping has been tested by the PSI with calculations and practical measurements and occupied”Wickstrom. Construction of the injector end of 2010 completed in the last year alone has processed EPUCRET 12,000 tonnes of mineral cast in the machinery and equipment manufacturing, and is the market leader. With its usage in the major research facility for the Switzerland mineral casting has prevailed once more compared to steel and cast iron. For Dr. UTZ-Volker j a clear sign. The collaboration with the Paul Scherrer Institute is for us a first-rate reference that recommends us for other research projects. The flexibility of mineral cast leaves it no doubt”, forward Jackisch. EPUCRET all-round well-thought-out answer to our needs brings us an important step forward. The cooperation with EPUCRET is a professional and efficient, was also an important aspect. We are confident that we will complete the construction of the injector until end of 2010″, says Wickstrom. His Institute is under strong competitive pressure in the development of the system. Currently, X-ray light source be developed in various countries, which should deliver Ultrashort laser pulses. Famous examples: the linac coherent light source (LCLS) in California and the European XFEL X-ray laser, which should be 2014 in Hamburg at the start. Against this background, we need innovative concepts. Mineral cast is an important component of”confirmed Wickstrom.