In electronics, when describing a voltage or current step function, rise time is the time taken by a signal to change from a specified low value to a specified high value. These values may be expressed as ratios or, equivalently, as percentages respect to a given reference value. In analog or digital electronics, these percentages are commonly the 10% and 90% (or equivalently 0.1 and 0.9) of the output step height: however, other values are commonly used. For applications in control theory, according to Levine (1996, p. 158), rise time is defined as "the time required for the response to rise from x% to y% of its final value", with 0% to 100% rise time common for underdamped second order systems, 5% to 95% for critically damped and 10% to 90% for overdamped ones. According to Orwiler (1969, p. 22), the term "rise time" applies to either positive or negative step response, even if a displayed negative excursion is popularly termed fall time.

Overview

Rise time is an analog parameter of fundamental importance in high speed electronics, since it is a measure of the ability of a circuit to respond to fast input signals. Many efforts over the years have been made to reduce the rise times of generators, analog and digital circuits, measuring and data transmission equipment, focused on the research of faster electron devices and on techniques of reduction of stray circuit parameters (mainly capacitances and inductances). For applications outside the realm of high speed electronics, long (compared to the attainable state of the art) rise times are sometimes desirable: examples are the dimming of a light, where a longer rise-time results, amongst other things, in a longer life for the bulb, or in the control of analog signals by digital ones by means of an analog switch, where a longer rise time means lower capacitive feedthrough, and thus lower coupling noise to the controlled analog signal lines.

Rise or RISE may refer to:

Music

Albums

"Rise" is the second single released by the alternative hip hop group Flobots from Denver, Colorado. It was released from Flobots' album Fight with Tools.

Track listing

CD

Play.com (UK Maxi) (MP3 EP)

Music video

The Flobots filmed a music video for this song on July 6, 2008, at the Gothic theater In Denver, Colorado. The video shows a rock concert intermixed with scenes of pro-American posters and people working to make the world a better place, such as planting trees and committing random acts of kindness. The video features almost everyone in some form of American Flag bandanna, much like the cover for Flobot's album "Fight with Tools." In the video, multiple references are made to the website americawillbe.org, a pro-peace website dedicated to the visions of what people want USA to be.

Chart performance

On September 13, 2008, "Rise" charted on the Billboard Hot Modern Rock Tracks at number 36. So far, the song has peaked at number 33.

Rise (also unofficially known as the Balls of the Falls,Belfast Ball,Westicle and Broadway Junction Art Piece), is a concept £400,000public art spherical metal sculpture by Wolfgang Buttress. It is 37.5 metres (123 ft) high and 30 metres (98 ft) wide and was constructed in early 2011 in the centre of the Broadway roundabout, at the junction of the Westlink and M1 motorway, a main gateway to the city where (as of 2009) more than 80,000 cars on average flow past it each day.

Rise is visible for miles around the city. The area is part of a multi-million pound road improvement programme. It is the biggest public art sculpture in Belfast. Work on Rise was due to begin in August 2009 and end in October 2009, however due to delays the completion date was changed to March 2011. It was finally completed in September 2011, nearly two years behind the original schedule. When completed it became Belfast's largest public artwork.

Construction

The globe-shaped, white and silver steel sculpture is a representation of a new sun rising to celebrate a new chapter in the history of Belfast.