Tech Write For Us – If they are on a hard drive, it should be known that this support uses a magnet to order charged particles on a tape, which are then translated into information. Each writing renews the magnetic field. The charge weakens until the entire drive fails, which can take up to six or seven decades. Since the process is gradual, it is recommended to erase and rewrite the disc every few years if it is not used.
WHAT SPEED DOES A CAMERA HAVE TO HAVE TO FREEZE AN IMAGE?
The video reproduces 25 images per second, which in the jargon are known as frames and which are photographs that follow one another to give a sensation of movement. But many more can be recorded. Of course, since 25 per second are then reproduced, the more frames are recorded, the slower the scene will be played: if a thousand are recorded, for example, the first 25 will be almost identical, and the movement will be nearly frozen. On the other hand, the more images recorded in the same period, the less time each of them will cover. For this reason, the frames recorded more quickly are characterized by photos in which the scene is frozen. If each frame contains a movement of one second, it is impossible to capture the exact image of the mechanic with his hands on the windshield. But the engineers have gone further: there is a camera that records 4,
HOW CAN A CAR KNOW WHEN IT IS GOING TO LEAVE ITS LANE?
There are two ways. The most accurate and used is a computer program capable of distinguishing the lines that delimit the lane, both in front and on the car’s sides. A device installed in the upper part of the windshield, usually behind the rear-view mirror, captures the image with a camera and processes it to verify that the car is moving in the correct place. The device discriminates between a continuous line and a discontinuous one. It alerts the driver when it detects that he will cross a straight or discontinuous line without turning on the indicator. The second way a car has to know if it is going in its lane is through an infrared sensor that detects when it steps on a line. It usually placed closer to the asphalt. It is less accurate but more effective at night and in fog.
IS THERE ANY COUNTRY WHERE THERE IS NO INTERNET YET?
Almost. 99.5 per cent of Myanmar’s population is offline. Neither did 97.8 of Ethiopians and 95.4 of Tanzanians, according to a study published by the consulting firm McKinsey & Company.
HOW DOES A ROBOT GET TO WRITE NEWS WITHOUT HELP?
The key is in artificial intelligence. There are algorithms capable of converting any information added to a database into a journalistic text. These robots already work in some newsrooms writing news based on pure and complex data, such as those related to the Stock Market. Once the user has selected the type of relevant information, the machine writes his news when new data arrives, updating the last word in minutes. The Los Angeles Times first used this solution in 2013 to report on an earthquake eight minutes after it struck.
HOW DO WEBSITES DEDUCE THE AGE OF INTERNET USERS?
Very hard. Web admins want to know their audience, know what advertising to associate with their content, and monitor possible abuse or harassment on social networks. The direct methods proposed by the internet service provider (ISP) industry are limited to creating databases where the IP of each computer appears (as its “registration”) associated with the visitor’s data. But privacy laws prohibit it in democratic countries. So companies infer ages from browsing behaviour: depending on the content you visit. But it is an inaccurate method and difficult to verify.
IS IT LEGAL TO CONNECT TO YOUR NEIGHBOR’S WIFI IF IT UNPROTECTED?
Well, it depends on the judge if there is a complaint. At the moment, there is a legal loophole.
Google is now facing a lawsuit for using US user data when connecting to their WiFi networks when preparing its Streetview program. The complaint would probably not have criminal proceedings, but things are not clear from the point of view of data protection. It can be considered a telecommunications fraud since connecting to the neighbour’s WiFi network could be regarded as causing economic damage to the operating company and, in addition, to the neighbour, since the network’s speed through which he pays.
WHAT DO YOU CALL A ‘MEME’?
Now it understood that they ingenious and contagious phrases that run through the internet.
The term was invented in 1976 by the biologist Richard Dawkins to make an analogy how a good idea and a successful gene ‘contagious’.
WHAT IS THE ‘SOLID STATE DRIVE’ OF A COMPUTER?
It is an alternative to the hard drive that makes its way.
It is a plate made up of several memories (of the flash type, almost always) that it is not necessary to read with a reading arm, as in disks. That reduces its size and battery drain. And it works a little faster.
HOW DOES TWITTER DECIDE THAT A LABEL IS A ‘TRENDING TOPIC’?
The social network does not provide details of its algorithm, but its Help mentions that the novelty of a hashtag (#quonsultas, for example) is more important than the number of tweets that mention it. In other words, a new word tweeted 500 times better valued than one from the previous day mentioned 2,000 times.
WHAT DO YOU CALL ‘GHOST’ MESSAGES?
They are nothing yet, but they have talked about for some time as a hypothesis (or almost as a wish) so that digital conversations not recorded beyond the moment. There are emails and instant messages (WhatsApp, chats on social networks and others) from work, legal, and love…, which are suitable to keep. But other intimate or unimportant conversations can taken out of context in the future and upset us. The first attempt was launched by two Stanford students who had created the Snapchat messaging application. In the messages and images self-destruct without remedy within 10 seconds of being read. Facebook recently reacted by launching another app called Poke.
COULD YOU MAKE LASER SWORDS?
For various technical and industrial reasons, no. The most important are two: to achieve a sabre like the one in Star Wars, which is capable of cutting and melting even steel, would require such a power supply that, today, it would need a generator about the size of a big fridge.
The second challenging aspect is the length of the “leaf” because how could the light end at a certain point?
The closest thing that has reported is the Plasma Knife that the US Army designed to cauterise combat wounds, not as a cutting tool.
WHERE DOES THE NAME OF VIRUSES AND TROJAN COME FROM?
Once installed on the PC, computer viruses make copies of themselves that introduced into other programs. These are small harmful or data-stealing software that enters a computer “embedded” within a conventional program. And a Trojan acts like the mythical Trojan horse: an application camouflaged inside another that harmless. When this opened, the Trojan acts, above all, by stealing passwords.
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