Info Tech

What is nuclear energy ? Term nuclear is referred to the nucleus, which is the central part of an atom surrounded by electrons contain most of its mass. According to the Einstein formula " E = MC 2 " if the nucleus of an atom is split-ed in two then a certain amount of that atoms mass is converted into energy. History 1895 Roentgen discovers X-rays ,1898 The Curies identify 2 radioactive nuclides, coin term "radioactive“ 1899 Rutherford distinguishes alpha and beta radiation and discovers half-life, 1909 Rutherford discovers that most mass is concentrated in a small nucleus.1920 Rutherford theorizes a "neutron“ .1935 Chadwick identifies neutrons .1938 Hann and Strassman split uranium atoms with neutrons, Meitner and Frisch explain what's happening and name it "fission“ 1939 Fermi and Szilard measure neutron multiplication, conclude that a nuclear chain reaction is possible .1939 Szilard, Wigner, and Teller co...

Find out how we patch up holes in vessels and pipes in a watery environment Joining and fusing materials together has been a key part of engineering for centuries, but what about doing it underwater? High-pressure welding, more formally called hyperbaric fabrication, can now be undertaken in water in two ways. Dry welding is done in a closed chamber, while wet welding can join metals completely exposed to water.  An example of a dry welder is the Deep Rover submersible. Primarily used for exploration, this vehicle can hold up to two people in a sealed sphere and is capable of lifting chunks of metal  too. Wet welding, on the other hand, creates a bubble of carbon dioxide around the weld point while the repair is made. Dry welding is safer due to the added protection but tends to be more  expensive and time-consuming. Therefore, dry is better for larger, more involved projects while wet is generally used for smaller tasks. Both are used primarily t...

How it is possible that internet accurately know what kind of things we "like" or "dislike" Advertisers use a range of information  about you, like your age, gender and  location, to flag up relevant ads If you look at a product on the web you may find that it follows you around, popping up in adverts on seemingly unrelated websites.  This is one of the simplest forms of targeted advertising. When you visit a website, third-party advertisers leave tracking cookies in your browser, enabling them to monitor your online activity and remind you later of items or services you looked at earlier. Search engines like Google collect data about the searches performed from a particular IP address, taking into account search terms, but also the user’s location.  They even target advertising based on keywords collected from the messages in your email inbox. Your activity on Google-owned sites like YouTube is also fed back to advertisers...

To disperse crowds and prevent rioting, various forms of non-lethal weapons (NLW) are used. Among these, interestingly, is sound. Known as an acoustic or sonic weapon, infrasound (superlow frequency) and ultrasound (super-high frequency) greatly affect human ears. They can disorientate a target and have psychological effects as well as physical effects of nausea and damage to blood vessels. Explanation Ultrasound can be increased to 120 decibels (the same volume as a jumbo jet taking off), which is considered the human pain threshold. In contrast, infrasound feels like a damaging vibration or pressure wave, as it’s at a frequency too low for humans to hear. When exposed to high levels of sound, the influx of energy has a painful effect on the body. As well as huge decibels of volume, the variations in frequency can also cause damage. For instance, an infrasound of seven or eight Hertz can rupture blood vessels. Certain types of sound within the frequencies we are able to he...

Thomson discovered the electron using this concept in 1897 after conducting experiments with cathode rays and studying their uses. Electron guns are a very versatile electrical component. They are essential to a number of devices, from 3D printers and welders to the large synchrotron at the Diamond Light Source in the UK and the electric systems of Kimball Physics in the US So how they work It’s all down to kinetic energy and electrical currents. When installed in an electrical device’s vacuum tube, the gun turns electrons and ions into usable beams of energy by releasing them from their  metal source (cathode). This process is known as thermionic emission. Inside the gun there is a small filament that heats the cathode, which makes it release a stream of electrons. The electrons accelerate rapidly and the resulting beam is pulled toward the neighbouring anode, which is positively charged. There are small holes in the anode which allow some electrons to pass through, so a...

A 3Doodler allow anybody to write directly into the air by heating some plastic materials like PLA and ABS  The world’s first 3D-printing pen – WobbleWorks’s 3Doodler – was launched in 2013,  This  enables you to turn drawings into full-3D models on any surface, without the need of any other  software or computer. Unlike a normal pen, however, the 3Doodler doesn’t use ink, instead relying on filaments of ABS(Acrylonitrile Butadiene Styrene)  or PLA(polylactic acid)  plastic, materials  also used by most desktop 3D printers. How it works  The 3Doodler prints by heating three-millimetre (0.1-inch)-thin strands of plastic, which need to be loaded into its back. After turning the 3Doodler on and waiting a few minutes for it to warm up, the LED indicator light will then turn blue, which means that the heated plastic can then extrude from the 3Doodler nozzle’s metal tip – the only potentially dangerous part, which can get as hot as...

If you have a picture downloaded from facebook and you want to check the uploader or source of the picture from where the picture was downloaded , then follow the steps  select any picture from your computer "usually from you downloads folder" which is downloaded by facebook You can make guess that if a picture is downloaded from facebook or not by looking at its name like "112334_33345884_33384754774.jpg"  if the name is like the give pattern then the picture is from facebook so next you just have to copy the number between two underscores like "112334_ 33345884 _33384754774.jpg"  and add this number to the facebook url like ->  www.facebook.com/33345884  and press enter ..........and you are done  one thing keep in mind you can check only for the pictures which are downloaded from Public source you can also see the demo by screen shots   step 1 step 2  step 3  add the number t...