What is Channel: Definition and 186 Discussions

Channel 4 is a British free-to-air public-service television network with a remit to produce "high quality and distinctive programming". Its headquarters are in London, with a national headquarters in Leeds and creative hubs in Glasgow and Bristol.The channel was established to provide a fourth television service to the United Kingdom in addition to the licence-funded BBC One and BBC Two, and the single commercial broadcasting network ITV.
It began transmission on 2 November 1982, the day after Welsh language broadcaster S4C's launch. Although largely commercially self-funded, it is ultimately publicly owned; originally a subsidiary of the Independent Broadcasting Authority (IBA), the station is now owned and operated by Channel Four Television Corporation, a public corporation of the Department for Digital, Culture, Media and Sport, which was established in 1990 and came into operation in 1993. In 2010, Channel 4 extended service into Wales and became a UK-wide television channel.

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  1. J

    Replace Aluminum C channel with Steel

    Application: Aluminum gooseneck horse trailer incorporates (2) 6 foot long 8 x 2.25 x .25 6062 aluminum C channel beams (sitting long side vertical) from each of the front corners of the box, coming to a point (forming a triangle with the front edge of the box) where they are welded together and...
  2. S

    Finding Shear Centre of Lipped Channel

    Homework Statement The figure shows the cross-section of a lipped channel; http://img149.imageshack.us/img149/6324/88754244yh7.th.png I need to locate the shear centre based this. Homework Equations Second moment of area / inertia; Ixx = (1/12)bh^3 + Ay(bar)^2 First moment...
  3. Simfish

    Help with entropy calculation (binary erasure channel)

    So in a binary erasure channel, the book says that H(Y) [of the output] = H((1-p)(1-a),a,p(1-a)) = H(a) + (1-a)H(p), where p = Pr (X=1) [rather than X = 0] and a is the probability that ANY input of X would be erased. the problem is, how do you get from H((1-p)(1-a),a,p(1-a)) = H(a) +...
  4. M

    History What Will the Large Hadron Collider Uncover Next?

    The Next Big Bang Premieres Sunday, March 16th at 8:00pm EST on The History Channel (Check local listings for other dates and times.) This year, the largest, most powerful science experiment in history will be turned on. The "Large Hadron Collider" at the CERN laboratory in Geneva Switzerland...
  5. W

    Music The Musician's Channel: Pro Musicians & Teachers Teach Music

    What do you think about creating a commercial free channel which plays nothing but pro musicians and teachers giving video lessons. You could have a channel for each instrument if you wanted. Maybe have one program that covers like 4 or 5 instruments: drums, bass, guitar, piano, voice. Then...
  6. Ivan Seeking

    UFO Hunters on The SciFi Channel and The History Channel

    This show premiers tonight at 10 PM. I expect it to be a bunch of hype, but we will see. http://www.scifi.com/ufohunters/ I think it is the first regular series to address the subject of UFOs exclusively.
  7. T

    River channel problem using Bernoulli and Continuity

    [SOLVED] River channel problem using Bernoulli and Continuity Homework Statement A river (100 m wide) flows through its rectangular channel at a depth of 2.560 m at a velocity of 2.050 m/s. What is the velocity of the discharge if the channel is narrowed to 90 m? Homework Equations...
  8. K

    Question on open channel flows

    Homework Statement Flow in an open channel is shown in Figure 1. The flow in the channel is 2.6m^3/s /m the bed slope is 1/1250 and Manning's n is 0.02. The gate opening is 0.5m. a) calculate the normal and critical depths for the flow in the channel b) calculate M2 and M3 surface profiles...
  9. O

    Comparing strength of channel versus flat steel

    I am trying to repair my 1920s pier and beam house and have a situation where I need to slide under two butted beams on top of a post the thinnest steel I can that will support the two beams. What would help me determine this would be a general idea of how to compare the strength of a flat...
  10. P

    Is Ramtha a legitimate channel or just a skilled actress?

    My friend recently reccomended i watch some footage of JZ knight, who claims to be channeling a spirit called Ramtha. Of course, i dismissed his comments, as i do not believe in spirits, or ghosts, or any other (probably psychosematic) phenomeneon. However, out of pure curiosity i did watch some...
  11. D

    S4 helix of voltage-gated channels is the voltage sensor of the channel

    im trying to understand this any explanations
  12. P

    History History channel: Alien engineering show

    History channel: "Alien engineering" show I'm curious if anyone saw this show, or part of it. (I only watched part, it was rather long). For a rather ga-ga premise, the show seemed to be fairly serious. A friend of mine commented that it might attract kids to science. I know I don't want...
  13. M

    History Hutchison on the History Channel?

    Hutchison on the History Channel? WHAT THE HELL?!?!??!??!? You guys have probably heard of http://en.wikipedia.org/wiki/John_Hutchison" , the crackpot responsible for the hutchison effect. Today I was watching the History Channel, and there was some show about black holes and the possibility...
  14. J

    Maximun bps rate on an ITU channel over standard single mode fiber

    I have to find the maximun bps that it can be reach using a point-to-point link of 40 km long of optic fiber. I use an ITU normalized channel (100 GHz optic BW). So, I can choose any electric modulation and any optic modulation, too. Anybody could help me? Any answer is welcome. Thanks.
  15. D

    Binary symmetric channel capacity

    Hi to our nice community. I want to learn why in a binary symetric channel the channel is calculated as C=1+plogp+(1-p)log(1-p) I only know that the channel is denoted as C=maxI(X;Y) btw what ; means in X;Y? Unfortunately my book doesn't mention these things so if u can reply me or...
  16. L

    White noise in communication channel

    hi all - its been very long - hope everyone is well! just a data comms related question: When modelling a communication channel we normally include AWGN, that is, Additive white gaussian noise. Can anybody tell me why we use white noise in the model. I know it has a constant power...
  17. H

    Transition from pipe flow to open channel flow

    I'm working on a fluid flow problem that doesn't seem very complex but the solution is eluding me at the moment. Given a length of smooth tubing of known ID and roughness with water running through it, is it possible to predict at what velocity the flow will transition from "pipe" flow (fully...
  18. Ivan Seeking

    Excitement Builds: SciFi Channel Premiere Tonight!

    on the SciFi channel. Is anyone else watching? They have really been hyping this for some time...
  19. B

    Do you people here watch The MythBusters on Discovery Channel?

    Do you people here watch The MythBusters on Discovery Channel? I think those people on the show are super weird but cool. They have also conducted several ground-breaking experiments like "Is it possible to break wind so much that you can suffocate to death? " and "Are teeth strong enough to...
  20. Ivan Seeking

    What news channel does Dick Chenney prefer?

    As reported by Lou Dobbs on CNN, it is required that all TVs for the VP suite be programmed for Fox News only. :rofl: Talk about a closed loop!
  21. M

    History Two hour Disney World Special on History Channel 2PM ET

    Just thought maybe someone would be interested :redface: It's a special two hour modern marvels. http://www.historychannel.com/modernmarvels/?page=upcoming
  22. M

    Loss due to open channel to pipe flow transition

    Hi! I have the following equation for the entrance loss from an open channel to a pipe, but I'm not sure how it was derived: hloss = K*(V2^2 - V1^2)/2g I have always seen entrance losses as: K*(V^2)/2g, but why is the channel flow velocity considered in the equation above. Thanks...
  23. M

    Entrance loss from open channel to pipe

    Hi! I have the following equation for the entrance loss from an open channel to a pipe, but I'm not sure how it was derived: hloss = K*(V2^2 - V1^2)/2g I have always seen entrance losses as: K*(V^2)/2g, but why is the channel flow velocity considered in the equation above. Thanks...
  24. T

    TV Guide Channel: Where is the FCC When You Need Them?

    this is not a lie. You know that channel that scrolls a guide for what's on TV? I think it is called the TV Guide Channel. I swear to God that right now as I'm typing this, on channel 7 from 6 to 6:30pm is the following show and it really gets me upset: Cox connecting with kids where is the FCC...
  25. N

    Setting Up the Physics Forums IRC Channel

    It seems to me PF is well-attended enough to get its own IRC channel. Not that that is much work, of course, but still. Maybe this is a rather nice idea, since some threads start looking like a chat already.. Of course, I can't start an official PF Irc channel on my own, since I am rather...
  26. Greg Bernhardt

    Favorite intellectual TV channel

    Favorite "intellectual" TV channel What "intellectual" TV channel do you enjoy the most?
  27. TheStatutoryApe

    News Exploring Clear Channel: Debunking Myths & Facts

    Clear Channel... I know that it isn't really current news but I have heard quite a bit of bad press in regards to Clear Channel. Alot of it seems to be embellished from what I have gathered. There seem to be two main complaints. One: Clear Channel is partisan and it's radio news, among...
  28. E

    What's wrong with The Discovery Channel?

    Seriously, did anyone see their most recent program called Voyage to The Planets and Beyond? It's totally ridiculous! The program is about a manned voyage to 5 of the 9 planets and close pass by the sun, a voyage that alone takes over 1200 days. I'll list some of the outragous events that take...
  29. C

    Unlock the Secrets Behind Cable Channel Encoding

    Does anyone know why on some cable channels I didn't subscribe, I can still see something (with a lot of distortion and noise), while I can't see anything at all in some others? How are the signal modulated and encoded? Are they encrypted? How come some channels are encoded that I can still...
  30. K

    Discovery channel will be re-airing its show Supervolcano

    Discovery channel will be re-airing its show "Supervolcano" Just as an alert, the Discovery channel will be re-airing its show "Supervolcano" Sunday, April 10, at 8:00 PM amd 11:00 PM. KM
  31. M

    History Kecksberg: History Channel, James Oberg

    not sure if this has aired before, but it mentioned Gumble/SC Fi's (in 2003,forget when) This was excellent--at least Cosmos 96 was debunked (James Oberg even reaches this 'conclusion',yet begins his own 'conspiricy theory' ---mindboggling; perhaps his 'balloon solutions' should be...
  32. dduardo

    Who Is to Blame for the Loss of Our Favorite Alternative Rock Station?

    Curse You Clear Channel! This is a very sad day for South Florida. We have lost our only alternative rock station 94.9 Zeta. The Miami Herald is reporting that Clear Channel is turning the station into some type of Spanish format. For the time being Air America's news and sports talk will be...
  33. K

    What is the current density in the ion channel?

    Measurements with microelectrodes have shown that a 0.30-nm-diameter potassium ion (K+) channel carries a current of 1.8 pA. How many potassium ions pass through if the ion channel opens for 1.0 ms? What is the current density in the ion channel? I am completely lost for this one...
  34. C

    Hydrogen on History Channel Wednesday

    According to my TiVo guide this Wednesday at 10PM the show "Modern Marvels" on the History Channel will have a program about hydrogen as a fuel. Those interested may want to check it out to see if it indeed covers this topic. Cliff
  35. C

    Black Sky: Space Ship One documentary on Science Channel

    Science Channel showed last night a documentary called "Black Sky" that was a 2 hour behind the scenes look at the operations at Scaled Composities and a short history of Burt Rutan. They have footage of the construction of the carrier plane White Knight and the test flights of Space Ship One...
  36. Ivan Seeking

    SCI FI Channel may sue US gov't for UFO documents

    http://biz.yahoo.com/rc/031021/media_scifi_1.html
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