List of seas

The word sea can, aside from referring to the World Ocean, also mean a specific, much smaller body of water, such as the North Sea or the Red Sea. There is no sharp distinction between a sea in this sense and an ocean, though seas are generally smaller, and are often partly (as marginal seas) or wholly (as inland seas) bordered by land. However, the Sargasso Sea has no coastline and lies within a circular current, the North Atlantic Gyre. It is a distinctive body of water with brown Sargassum seaweed and calm blue water, very different from the rest of the Atlantic Ocean. Seas are generally larger than lakes, and contain salt water rather than freshwater, but some geographic entities known as "seas" are enclosed inland bodies of water that are not salty: for instance, the Sea of Galilee is a freshwater lake. The Law of the Sea states that all of the ocean is "sea".

Seas (disambiguation)

Seas may mean:

Wind wave

In fluid dynamics, wind waves, or wind-generated waves, are surface waves that occur on the free surface of oceans, seas, lakes, rivers, and canals or even on small puddles and ponds. They result from the wind blowing over an area of fluid surface. Waves in the oceans can travel thousands of miles before reaching land. Wind waves range in size from small ripples, to waves over 100 ft (30 m) high.

When directly generated and affected by local winds, a wind wave system is called a wind sea. After the wind ceases to blow, wind waves are called swells. More generally, a swell consists of wind-generated waves that are not significantly affected by the local wind at that time. They have been generated elsewhere or some time ago. Wind waves in the ocean are called ocean surface waves.

Wind waves have a certain amount of randomness: subsequent waves differ in height, duration, and shape with limited predictability. They can be described as a stochastic process, in combination with the physics governing their generation, growth, propagation and decay—as well as governing the interdependence between flow quantities such as: the water surface movements, flow velocities and water pressure. The key statistics of wind waves (both seas and swells) in evolving sea states can be predicted with wind wave models.

Fading

In wireless communications, fading is deviation of the attenuation affecting a signal over certain propagation media. The fading may vary with time, geographical position or radio frequency, and is often modeled as a random process. A fading channel is a communication channel that experiences fading. In wireless systems, fading may either be due to multipath propagation, referred to as multipath induced fading, or due to shadowing from obstacles affecting the wave propagation, sometimes referred to as shadow fading.

Key concepts

The presence of reflectors in the environment surrounding a transmitter and receiver create multiple paths that a transmitted signal can traverse. As a result, the receiver sees the superposition of multiple copies of the transmitted signal, each traversing a different path. Each signal copy will experience differences in attenuation, delay and phase shift while travelling from the source to the receiver. This can result in either constructive or destructive interference, amplifying or attenuating the signal power seen at the receiver. Strong destructive interference is frequently referred to as a deep fade and may result in temporary failure of communication due to a severe drop in the channel signal-to-noise ratio.

Fade

Fade or Fading may refer to:

Science and technology

Film, television and theatre

Literature

Music

Performers

Albums

Songs

Fading (song)

"Fading" is a song by Barbadian recording artist Rihanna from her fifth studio album, Loud (2010). The song was written by Jamal Jones and Ester Dean, whilst production of the song was completed by Jones under his production name, Polow da Don. Musically, the song samples Irish instrumentalist and singer-songwriter Enya's "One by One", whilst lyrically, the song is about leaving a man in a relationship. After Loud had strong digital download sales in the United Kingdom, "Fading" charted at number 187 on that country's singles chart in November 2010. The song received generally positive reviews from music critics, who praised da Don's production, but one critic criticized Rihanna for copying herself and failing to create something different. Some critics also compared it to one of Rihanna's previous singles, "Take A Bow". The song has also been performed on select dates of the Loud Tour (2011).

Background

Recording sessions for Loud began in February 2010, and continued for six months, overlapping with Rihanna's Last Girl on Earth Tour and during production of her debut feature film, Battleship. At the beginning of March 2011, Rihanna asked fans to help her select her next single, following the release of "S&M". Via Twitter, fans were asked to choose from "Cheers (Drink to That)", "Man Down", "California King Bed" or "Fading". The most popular choice would have its video filmed at the end of March 2011. On March 12, 2011, it was confirmed that fans had selected "California King Bed" as the next single to be released from the album in the United States. In August 2011, a new version of "Fading" was leaked online, without the Enya sample.