Filtration

Filtration is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass. The fluid that passes through is called the filtrate. Oversize solids in the fluid are retained, but the separation is not complete; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the pore size and filter thickness). Filtration is also used to describe some biological processes, especially in water treatment and sewage treatment in which undesirable constituents are removed by absorption into a biological film grown on or in the filter medium as in slow sand filtration.

Applications

Audio filter

An audio filter is a frequency dependent amplifier circuit, working in the audio frequency range, 0 Hz to beyond 20 kHz. Many types of filters exist for applications including graphic equalizers, synthesizers, sound effects, CD players and virtual reality systems.

Being a frequency dependent amplifier, in its most basic form, an audio filter is designed to amplify, pass or attenuate (negative amplification) some frequency ranges. Common types include low-pass filters, which pass through frequencies below their cutoff frequencies, and progressively attenuates frequencies above the cutoff frequency. A high-pass filter does the opposite, passing high frequencies above the cutoff frequency, and progressively attenuating frequencies below the cutoff frequency. A bandpass filter passes frequencies between its two cutoff frequencies, while attenuating those outside the range. A band-reject filter, attenuates frequencies between its two cutoff frequencies, while passing those outside the 'reject' range.

Today

Today may refer to:

News media

Radio

Press

Today (Superpitcher album)

Today is a mix album made by German electronic music artist Superpitcher. It was released in 2005 on the Kompakt music label.

Track listing

Today (2012 film)

Today (French: Aujourd'hui) is a 2012 French-Senegalese film directed by Alain Gomis. The film competed in competition at the 62nd Berlin International Film Festival in February 2012.

Plot

Satché is about to die. He decides to make his last day on this world the day of his life.

Cast

References

External links

Today at the Internet Movie Database

World

World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide, i.e. anywhere on Earth or pertaining to anywhere on Earth.

In a philosophical context it may refer to:

In a theological context, world usually refers to the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred. The "end of the world" refers to scenarios of the final end of human history, often in religious contexts.

World history is commonly understood as spanning the major geopolitical developments of about five millennia, from the first civilizations to the present.

World population is the sum of all human populations at any time; similarly, world economy is the sum of the economies of all societies (all countries), especially in the context of globalization. Terms like world championship, gross world product, world flags etc. also imply the sum or combination of all current-day sovereign states.

World (Bee Gees song)

"World" is a song from the Bee Gees' fourth album Horizontal, released in 1967 in the United Kingdom. Though it was a big hit in Europe, Atco Records did not issue it as a single in the United States, having just issued a third single from Bee Gees' 1st, "Holiday".

Composition

The song's lyrics question the singer's purpose in life.

Recording

The song's first recording session was on 3 October 1967 along with "With the Sun in My Eyes" and "Words". The song's last recording session was on 28 October 1967. "World" was originally planned as having no orchestra, so all four tracks were filled with the band, including some mellotron or organ played by Robin. When it was decided to add an orchestra, the four tracks containing the band were mixed to one track and the orchestra was added to the other track. The stereo mix suffered since the second tape had to play as mono until the end when the orchestra comes in on one side. Barry adds: "'World' is one of those things we came up with in the studio, Everyone just having fun and saying, 'Let's just do something!' you know". Vince Melouney recalls: "I had this idea to play the melody right up in the top register of the guitar behind the chorus".