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The beauty of a window shield is that it not only protects your windows, but also deters vandals and thieves due to its robust design and build. Vandals are generally opportunists aiming to smash several windows before they run off in the night. Our window screens make vandals think and take away the selling point of a quick smash and dash. Specialist vandal shields are available that contain an aluminium frame fitted using a 2mm perforated steel mesh. These shields offer excellent protection and are a very cost effective option.
Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability
The beauty of a window shield is that it not only protects your windows, but also deters vandals and thieves due to its robust design and build. Vandals are generally opportunists aiming to smash several windows before they run off in the night. Our window screens make vandals think and take away the selling point of a quick smash and dash. Specialist vandal shields are available that contain an aluminium frame fitted using a 2mm perforated steel mesh. These shields offer excellent protection and are a very cost effective option.
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