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Pager
A PAGER (also known as a BEEPER) is a wireless telecommunications device that receives and displays alphanumeric messages and/or receives and announces voice messages. ONE-WAY PAGERS can only receive messages, while RESPONSE PAGERS and TWO-WAY PAGERS can also acknowledge, reply to, and originate messages using an internal transmitter. Pagers operate as part of a paging system which includes one or more fixed transmitters (or in the case of response pagers and two-way pagers, one or more base stations ), as well as a number of pagers carried by mobile users. These systems can range from a restaurant system with a single low-power transmitter, to a nationwide system with thousands of high-power base stations. Pagers were developed in the 1950s and 1960s, and became widely used by the 1980s
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Capture Effect
In telecommunications , the CAPTURE EFFECT, or FM CAPTURE EFFECT, is a phenomenon associated with FM reception in which only the stronger of two signals at, or near, the same frequency or channel will be demodulated . The capture effect is defined as the complete suppression of the weaker signal at the receiver limiter (if it has one) where the weaker signal is not amplified , but attenuated . When both signals are nearly equal in strength, or are fading independently, the receiver may switch from one to the other and exhibit picket fencing . The capture effect can occur at the signal limiter, or in the demodulation stage, for circuits that do not require a signal limiter. Some types of radio receiver circuits have a stronger capture effect than others. The measurement of how well a receiver can reject a second signal on the same frequency is called the capture ratio for a specific receiver
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Classified Information
CLASSIFIED INFORMATION is material that a government body claims is sensitive information that requires protection of confidentiality, integrity, or availability. Access is restricted by law or regulation to particular groups of people, and mishandling can incur criminal penalties and loss of respect. A formal security clearance is often required to handle classified documents or access classified data. The clearance process usually requires a satisfactory background investigation. Documents and other information assets are typically marked with one of several (hierarchical) levels of sensitivity—e.g. restricted, confidential, secret and top secret. The choice of level is often based on an impact assessment; governments often have their own set of rules which include the levels, rules on determining the level for an information asset, and rules on how to protect information classified at each level. This often includes security clearances for personnel handling the information
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Reflex
A REFLEX, or REFLEX ACTION, is an involuntary and nearly instantaneous movement in response to a stimulus . A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain. The reflex is then an automatic response to a stimulus that does not receive or need conscious thought. CONTENTS* 1 Human reflexes * 1.1 Tendon reflex * 1.2 Reflexes involving cranial nerves * 1.3 Reflexes usually only observed in human infants * 1.4 Other reflexes * 1.5 Grading * 2 See also * 3 References HUMAN REFLEXESMYOTATIC REFLEXES The myotatic reflexes (also known as deep tendon reflexes), provide information on the integrity of the central nervous system and peripheral nervous system . Generally, decreased reflexes indicate a peripheral problem, and lively or exaggerated reflexes a central one. A stretch reflex is the contraction of a muscle in response to its lengthwise stretch
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Privacy
PRIVACY is the ability of an individual or group to seclude themselves, or information about themselves, and thereby express themselves selectively. The boundaries and content of what is considered private differ among cultures and individuals, but share common themes. When something is private to a person, it usually means that something is inherently special or sensitive to them. The domain of privacy partially overlaps security (confidentiality), which can include the concepts of appropriate use, as well as protection of information. Privacy
Privacy
may also take the form of bodily integrity . The right not to be subjected to unsanctioned invasion of privacy by the government , corporations or individuals is part of many countries' privacy laws , and in some cases, constitutions . Almost all countries have laws which in some way limit privacy
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Reed Receiver
A REED RECEIVER or TUNED REED RECEIVER (US) was a form of multi-channel signal decoder used for early radio control systems. It uses a simple electromechanical device or 'resonant reed' to demodulate the signal, in effect a receive-only modem . The encoding used is a simple form of frequency shift keying . These decoders appeared in the 1950s and were used into the early 1970s. Early transistor systems were in use in parallel to them, but they were finally displaced by the appearance of affordable digital proportional systems, based on early integrated circuits . These had the advantage of proportional control . CONTENTS * 1 Operation * 2 Number of channels * 2.1 Hedy Lamarr * 3 Transmitters * 4 Receivers * 5 Similar devices * 5.1 Aircraft navigation * 5.2 Radio paging * 5.3 Frequency measurement * 6 See also * 7 Notes * 8 References OPERATIONThe decoder of the reed receiver is based on the 'resonant reed' unit
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2005 London Bombings
The 7 JULY 2005 LONDON BOMBINGS, often referred to as 7/7, were a series of coordinated terrorist suicide attacks in London , United Kingdom, which targeted civilians travelling on the city\'s public transport system during the morning rush hour. Four Islamic terrorists separately detonated three bombs in quick succession aboard London Underground trains across the city and, later, a fourth on a double-decker bus in Tavistock Square . The train bombings occurred on the Circle line near Aldgate and at Edgware Road , and on the Piccadilly line near Russell Square . Fifty-two people, all UK residents but of 18 different nationalities, were killed and more than 700 were injured in the attacks, making it Britain's deadliest terrorist incident since the 1988 bombing of Pan Am Flight 103 over Lockerbie , Scotland, as well as the country's first ever Islamic suicide attack. The explosions were caused by homemade organic peroxide -based devices packed into backpacks
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TETRA
More than 150 Look up TETRA in Wiktionary, the free dictionary. Black neon tetra
Black neon tetra
, Hyphessobrycon herbertaxelrodi Pristella tetra, Pristella maxillaris
Pristella maxillaris
Golden pristella tetra, a morph of Pristella maxillaris
Pristella maxillaris
Silvertip tetra , Hasemania nana A TETRA is one of several species of small freshwater fish from Africa
Africa
, Central America
Central America
, and South America
South America
belonging to the biological family Characidae and to its former subfamilies Alestidae (the "African tetras") and Lebiasinidae . The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal and caudal fins
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Subsidiary Communications Authority
SUBSIDIARY COMMUNICATIONS AUTHORIZATION (SCA) in the United States, and SUBSIDIARY COMMUNICATIONS MULTIPLEX OPERATION (SCMO) in Canada, is a subcarrier on a radio station , allowing the station to broadcast additional services as part of its signal. CONTENTS * 1 Background * 2 Receiving the SCA Signal * 3 See also * 4 References * 5 External links BACKGROUND"Subsidiary Communications Authorization" is the United States Federal Communications Commission 's official designation for this type of service. SCA was deregulated in 1983; since then, both AM and FM licensed broadcast stations have been allowed to use subcarriers in the United States in general without requiring separate authority; authorization is only required for some uses which are still otherwise regulated, such as common carrier or Land Mobile Radio Service transmissions
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EIRP
EFFECTIVE RADIATED POWER (ERP), synonymous with EQUIVALENT RADIATED POWER, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter . It is the total power in watts that would have to be radiated by a half-wave dipole antenna to give the same radiation intensity (signal strength in watts per square meter) as the actual source at a distant receiver located in the direction of the antenna's strongest beam (main lobe ). ERP measures the combination of the power emitted by the transmitter and the ability of the antenna to direct that power in a given direction. It is equal to the input power to the antenna multiplied by the gain of the antenna. It is used in electronics and telecommunications , particularly in broadcasting to quantify the apparent power of a broadcasting station experienced by listeners in its reception area
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Emergency Service
EMERGENCY SERVICES and RESCUE SERVICES are organizations which ensure public safety and health by addressing different emergencies . Some of these agencies exist solely for addressing certain types of emergencies whilst others deal with ad hoc emergencies as part of their normal responsibilities. Many of these agencies engage in community awareness and prevention programs to help the public avoid, detect, and report emergencies effectively. The availability of emergency services depends very heavily on location, and may in some cases also rely on the recipient giving payment or holding suitable insurance or other surety for receiving the service
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Email
ELECTRONIC MAIL (EMAIL or E-MAIL) is a method of exchanging messages between people using electronic devices. Email
Email
first entered limited use in the 1960s and by the mid-1970s had taken the form now recognized as email. Email
Email
operates across computer networks , which today is primarily the Internet
Internet
. Some early email systems required the author and the recipient to both be online at the same time, in common with instant messaging . Today's email systems are based on a store-and-forward model. Email
Email
servers accept, forward, deliver, and store messages. Neither the users nor their computers are required to be online simultaneously; they need to connect only briefly, typically to a mail server or a webmail interface, for as long as it takes to send or receive messages
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Simulcast
SIMULCAST, a portmanteau of SIMULTANEOUS BROADCAST, is the broadcasting of programs or events across more than one medium , or more than one service on the same medium, at exactly the same time. For example, Absolute Radio is simulcast on both AM and on satellite radio , and the BBC
BBC
's Prom concerts were formerly simulcast on both BBC
BBC
Radio 3 and BBC
BBC
Television . Another application is the transmission of the original-language soundtrack of movies or TV series over local or Internet radio , with the television broadcast having been dubbed into a local language
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Watt
The WATT (symbol: W) is a unit of power . In the International System of Units (SI) it is defined as a derived unit of 1 joule per second , and is used to quantify the rate of energy transfer . In dimensional analysis it is described by M L 2 T 3 {displaystyle {mathsf {ML}}^{2}{mathsf {T}}^{-3}} . CONTENTS * 1 Examples * 2 Origin and adoption as an SI unit * 3 Multiples * 3.1 Femtowatt * 3.2 Picowatt * 3.3 Nanowatt * 3.4 Microwatt * 3.5 Milliwatt * 3.6 Kilowatt * 3.7 Megawatt * 3.8 Gigawatt * 3.9 Terawatt * 3.10 Petawatt * 4 Conventions in the electric power industry * 5 Radio
Radio
transmission * 6 Distinction between watts and watt-hours * 7 See also * 8 Notes * 9 References * 10 External links EXAMPLESWhen an object's velocity is held constant at one meter per second against a constant opposing force of one newton , the rate at which work is done is 1 watt
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Nobel Prize
The NOBEL PRIZE (/ˈnoʊbɛl/ , Swedish pronunciation: ; Swedish definite form, singular: Nobelpriset; Norwegian : Nobelprisen) is a set of annual international awards bestowed in several categories by Swedish and Norwegian institutions in recognition of academic, cultural, or scientific advances. The will of the Swedish scientist Alfred Nobel established the prizes in 1895. The prizes in Chemistry
Chemistry
, Literature , Peace
Peace
, Physics
Physics
and Physiology
Physiology
or Medicine
Medicine
were first awarded in 1901. Medals made before 1980 were struck in 23 carat gold, and later in 18 carat green gold plated with a 24 carat gold coating. Between 1901 and 2016, the Nobel Prizes and the Nobel Memorial Prize in Economic Sciences were awarded 579 times to 911 people and organisations
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Sir Mix-A-Lot
ANTHONY RAY (born August 12, 1963), better known by his stage name SIR MIX-A-LOT, is an American rapper and recording producer. He is best remembered for his hit song "Baby Got Back ". CONTENTS * 1 Early Life * 2 Career * 2.1 1980s * 2.2 1990s * 2.3 2000s * 2.4 2010s * 3 Other work * 4 Discography * 5 References * 6 External links EARLY LIFEAnthony Ray was born on August 12, 1963 in Seattle , Washington . He was a fan of hip hop and started rapping in the early 1980s. CAREER1980SSir Mix-a-Lot and his partner, Nasty Nes, founded the Nastymix record label in 1983. Mix-a-Lot's first hit, released in 1987, was the single "Posse on Broadway ," whose title referred to Broadway in Seattle's Capitol Hill district. The "Godzilla" remix of "Posse on Broadway" contained a sample from David Bowie 's 1975 hit "Fame ," but neither the album version nor the original seven-inch edit, which was used for the video, used the Bowie sample
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