|
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 first known patent with an electric mixer, according to the book ?Antique Electric Mixers? by Dennis Thompson, was handed to Rufus W. Eastman in 1885. It was a peculiar machine developed to operate on electricity or water power. Herbert Johnston, an engineer around 1908 saw a baker blend bread dough with only an iron spoon. As a result, Johnston was inspired to produce the most popular standing mixer. Eighty quart commercial grade mixers went on the market and instantly were thought of as a large labor saving tool around 1914. Trying out a home model, the wife of an executive proclaimed that it is ?the most effective kitchen aid I?ve ever endured? and therefore a brandname name is made. Since then, the standard home based mixers may be called KitchenAid. Validating KitchenAid?s advertisement which stated that it is mixer with attachments could ?do everything!?, today?s attachments have the capability to make pasta, fill up sausage, crush food, squeeze citrus, in addition to creating frozen goodies.
New Car Buying Tips--
mercedes master p
mercedes 420sel review
mercedes van warning lights
2007 mercedes-benz cls-class
mercedes benz of cherry hill nj
Copyright ?1998-2017 Technews Corp, All rights reserved
|
