Analog computer

An analog computer is a form of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. In contrast, digital computers represent varying quantities symbolically, as their numerical values change. As an analog computer does not use discrete values, but rather continuous values, processes cannot be reliably repeated with exact equivalence, as they can with Turing machines. Analog computers do not suffer from the quantization noise inherent in digital computers, but are limited instead by analog noise.

Analog computers were widely used in scientific and industrial applications where digital computers of the time lacked sufficient performance. Analog computers can have a very wide range of complexity. Slide rules and nomographs are the simplest, while naval gunfire control computers and large hybrid digital/analog computers were among the most complicated. Systems for process control and protective relays used analog computation to perform control and protective functions.

Analog

Analog or analogue may refer to:

In arts and entertainment

Magazines

In music

Other uses in arts and entertainment

In science and technology

In chemistry

Ancient Greek

Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BCE to the 6th century CE. It is often roughly divided into the Archaic period (9th to 6th centuries BCE), Classical period (5th and 4th centuries BCE), and Hellenistic period (3rd century BCE to 6th century CE). It is antedated in the second millennium BCE by Mycenaean Greek.

The language of the Hellenistic phase is known as Koine (common), while the language from the late period onward features no considerable differences from Medieval Greek. Koine is regarded as a separate historical stage of its own, although in its earlier form, it closely resembled the Classical. Prior to the Koine period, Greek of the classic and earlier periods included several regional dialects.

Ancient Greek was the language of Homer and of classical Athenian historians, playwrights, and philosophers. It has contributed many words to English vocabulary and has been a standard subject of study in educational institutions of the West since the Renaissance. This article primarily contains information about the Epic and Classical phases of the language.

Lost in Space

Lost in Space is an American science fiction television series, following the adventures of a family of pioneering space colonists whose ship goes off course. It was created and produced by Irwin Allen, filmed by 20th Century Fox Television, and broadcast on CBS. The show ran for three seasons, with 83 episodes airing between 1965 to 1968 The first television season was filmed in black and white, with the second and third seasons filmed in color.

Though the original television series concept centered on the Robinson family, many later story lines focused primarily on Dr. Zachary Smith, played by Jonathan Harris. Smith, along with the Robot, was absent from the pilot as the addition of their characters was decided once the series had been commissioned for production. Originally written as an utterly evil but careless saboteur, Smith gradually becomes the troublesome, self-centered, incompetent foil who provides the comic relief for the show and causes most of the episodic conflict and misadventures. In the unaired pilot, what causes the group to become lost in space is a chance encounter with a meteor storm, but in the first aired episode, it is Smith's sabotage and unplanned presence on the ship that sets the ship off course into the meteor field. Smith is thus the key to the story.