Electrostatic discharge - Wikipedia
Sudden flow of electric current between two electrically charged objects by contact Electrostatic discharge (ESD) is a sudden and momentary flow of electric current between two differently-charged objects when brought close together or when the dielectric between them breaks down, often creating a visible spark associated with the static electricity between the objects. ESD can create spectacular electric sparks (lightning, with the accompanying sound of thunder, is an example of a large-scale ESD event), but also less dramatic forms which may be neither seen nor heard, yet still be large enough to cause damage to sensitive electronic devices. Electric sparks require a field strength above approximately 4 × 106 V/m in air, as notably occurs in lightning strikes. ESD can cause harmful effects of importance in industry, including explosions in gas, fuel vapor and coal dust, as well as failure of solid state electronics components such as integrated circuits. Causes[edit] Types[edit]
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Radio spectrum - Wikipedia
The radio spectrum is the part of the electromagnetic spectrum from 3 Hz to 3000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are extremely widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU).[1] Different parts of the radio spectrum are appointed by the ITU for different radio transmission technologies and applications; some 40 radiocommunication services are defined in the ITU's Radio Regulations (RR).[2] In some cases, parts of the radio spectrum are sold or licensed to operators of private radio transmission services (for example, cellular telephone operators or broadcast television stations). By frequency[edit] ITU[edit] The ITU radio bands are designations defined in the ITU Radio Regulations. IEEE[edit]
10 Awesome Online Classes You Can Take For Free
Cool, but you need iTunes for nearly everything, and that gets an 'F.' Are there really no other places to get these lessons? I was sure there are some on Academic Earth. Flagged 1. 7 of them are available via YouTube. 2. iTunes is free. 1. 2. Don't worry, we're looking out for you! While I have no personal beef with iTunes, I know that many people share your sentiments — so I actually made a concerted effort to include relevant youtube links when possible.
Block Radio Waves
Key concepts Physics Radio waves Electricity Electromagnetism Wireless communication Introduction Have you ever wondered how a radio can receive music and news broadcasts over thin air? Radios, as well as radio-controlled cars and cell phones, all receive information via invisible waves. Some of these waves are called radio waves. Radio waves are a type of electromagnetic radiation, a kind of energy that also includes visible light. Background A transmitting antenna, or transmitter, generates and sends out radio waves thanks to a specific electrical current. When the electromagnetic radio waves hit a receiving antenna, or receiver, such as a radio, it generates a current inside of a wire in the receiver. Materials • Radio-controlled car and its corresponding remote control (both with working batteries) • Cotton (such as a piece of clothing made from cotton) • Aluminum foil • Plastic wrap • Wax paper • Rubber glove • A smooth, wide open space to test drive your radio-controlled car
The Amazing Abnormalities of the Human Body
No, cell phones are not “cooking men’s sperm”
I’ve written several times over the years about the overblown claims of harm attributed, largely—but not exclusively—by cranks, to cell phone radiation. It’s been claimed that radiation from cell phones can cause brain tumors (there’s no convincing evidence that this is true), breast cancer (the evidence for these claims is so incredibly flimsy—and featured by Dr. Oz, to boot!—that this is not a credible claim), and a wide variety of other health issues. Indeed, if you believe the cranks, the mobile phone companies are the equivalent of tobacco companies denying that their products cause massive harm. Never mind that, based on pure physics alone, it is incredibly unlikely that radio frequency radiation can cause cancer. Fertility experts are warning man that using a mobile for as little as an hour a day is “cooking sperm” and lowering level significantly. What utter rot! This is irresponsible journalism (and science communication, to boot—I mean you, Prof. So what about the study? Wow!
Top 10 Human Sideshow Freaks
Weird Stuff These are people who made a living as side-show freaks. Most had physical disorders and had no alternative way of making a living. A list of this type would not be complete without the most famous attraction of all: The Elephant Man. NOTE: Click the images for a larger view. 1. Born in 1862, Joseph Merrick developed a physical disorder that caused his limbs to grow extremely large when he was five years old. 2. Jean (or Juan) Baptista dos Santos is said to have been a “Gipsey”, born in Faro, Portugal around 1843, to normal parents with two other normal children. 3. Josephine Myrtle Corbin was born in Lincoln County, Tennessee in 1868. 4. Born in Basle, Switzerland, in 1884, Gabrielle Fuller first joined the circus at the Paris Exposition in 1900. 5. Mary Ann Webster was born in London, England in 1874, one of eight children. 6. The man who we have come to know as Martin Laurello was born Martin Emmerling in Nuremburg, Germany around 1886. 7. 8. 9. 10. Jamie Frater
Cell Phones and Cancer Risk Fact Sheet - National Cancer Institute
Inskip PD, Hoover RN, Devesa SS. Brain cancer incidence trends in relation to cellular telephone use in the United States. Neuro-Oncology 2010; 12(11):1147–1151. [PubMed Abstract] Deltour I, Johansen C, Auvinen A, et al. Time trends in brain tumor incidence rates in Denmark, Finland, Norway, and Sweden, 1974–2003.
