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When you go out shopping at the gym or a restaurant or just when you go grocery shopping and peruse the shelves at the supermarket, you know exactly where you are. Whether it's at your local mall, supermarket, grocery store or a small grocery store, you know where you are. With GPS, there is no need for a street name or building number. No matter where you are, the GPS will know and give you directions and tell you what you need to know.
A lot of people think of their smart phones as indispensable devices. Even if you have a cell phone without a GPS, you probably have a phone number, address book and calendar stored on it. Your cell phone automatically knows where you are. With just a glance at a map app, you can figure out where you are. Your phone will also notify you when you approach your destination.
In fact, the opposite is also true. When you go to a destination, your GPS will notify you if you are approaching a location where your destination is stored.
The GPS module and the information that it receives from the satellites is called the Global Positioning System or the Global Navigation System. You will find that there are numerous GPS models on the market, each with a different feature set.
All GPS systems are required by federal law to provide the user with a minimum of the following features:
* A map display with street and/or satellite names.
* A map display showing the position of the GPS receiver.
* A map display showing a route from the current location to a selected destination.
* A map display showing the destination of travel as a destination.
* A map display showing the distance from the current location to a selected destination.
* A map display showing the distance to the destination of travel.
* A map display that shows the starting position of the vehicle.
* A map display that shows the ending position of the vehicle.
* A map display that shows the direction of travel.
* A map display that shows the time of departure and arrival.
* A map display that shows the speed of travel.
* A map display that shows the azimuth or direction of travel.
* A map display that 01e38acffe
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A thick film of silver electrodes was laid along the top edge of the lunar far side opposite to Earth to record how particles would come off it after landing. Credit: NASA
A cloud of electrically charged particles has drifted through the Solar System, on its way to becoming part of the building blocks of life. Scientists have now measured this cosmic dust for the first time. The observations come from the recently completed LADEE mission, launched from Virginia's Wallops Flight Facility.
The Far Side of the Moon has been the invisible backdrop for decades of scientific observations by astronauts aboard the International Space Station. Using new data from LADEE, researchers have been able to address a long-standing question: how does space dust affect the moon?
"The Far Side is such a pristine environment," said LADEE Principal Investigator Larry Esposito, the Lynne and William R. Harrison Endowed Chair in Space Science and Engineering at the Colorado School of Mines in Golden. "There are no humans, no plants or animals, just an illuminated surface. We want to understand what's going on here."
Astronauts have used cameras aboard the ISS to examine the far side of the moon, but the data from these exposures have typically been incomplete. These images show what astronauts and their equipment look like on the far side, but cannot tell whether the light sources are reflecting off the surface or off something on top of it.
If astronauts were to use their own eyes, the amount of light they could see would be limited by their biological response to the dust. Even though there are no living organisms there, the moon is continuously shedding tiny particles, most of which are dust. The dust affects how light reflects off the moon, and the changes in the dust over time give scientists a way to measure the distribution of mass in lunar space.
"It's a very low-tech way of detecting mass in the lunar environment," Esposito said. "That's what makes it different from other approaches that use radio waves or gamma rays."
Researchers studied the dust particles by measuring how the moon affected the reflection of sunlight off its surface. To accomplish this, scientists used a system called Apollo Far Side Field Actinometry (AFPFA). This system was developed by J. Richard and Larry Goldstein of the Johns Hopkins Applied Physics Laboratory, in collaboration with Esposito.
The results from the AFPFA data were analyzed by
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