What is Grid: Definition and 222 Discussions

GRiD Systems Corporation was founded in late 1979 by John Ellenby, who left his job at Xerox Parc and joined Glenn Edens, Dave Paulsen and Bill Moggridge to form one of Silicon Valley's first stealth companies. The company went public in March 1981. It was located at 47211 Lakeview Boulevard, Fremont, California, 94537.
The "GRiD" name with the unusual lowercase "i" in the middle was the result of discussion between John Ellenby, Glenn Edens and John Ellenby's wife, Gillian Ellenby, who pushed for the final choice. The lowercase "i" was a note of thanks to Intel for helping in the early daysGRiD developed and released several pioneering ideas:
First portable computer. Marketed almost exclusively to CEOs
The GRiD Compass 1100, the first clamshell laptop computer
Patented the "clamshell" laptop design
First portable to use non-volatile bubble-memory
GRiD-OS was a multi-tasking Text-based user interface or TUI and operating system
First use of electro-luminescent displays in a portable
First use of magnesium for the case
First use of the Intel 8086 and 8087 floating-point co-processor in a commercial product.
Pioneered the concept of a "bus" for connecting peripherals (using GPIB)
First computer that included a fully functional telephone and telephone handset
The first commercially available tablet-type portable computer was the GRiDPad, released in September 1989. Its operating system was based on MS-DOS.
A GRiD Compass 1101 was the first laptop in space. Required special modification to add a fan to pull air through the case. Subsequently a GRiD 1530 flew on STS-29 in March 1989.
OldComputers.net called the 1982 GRiD Compass 1101 the "grand-daddy of all present-day laptop computers". It had 256k RAM, an 8086, 320x240 screen, and 384k of internal 'bubble memory' that held data with power off.In 1988, Tandy Corporation purchased GRiD. AST Computer acquired the company, and was itself later acquired by Samsung.Edens co-founded Waveform Corp and in 2003 joined the board of F5 Networks Inc.John Ellenby went on to co-found the companies Agilis and Augmented Reality pioneer GeoVector.

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  1. N

    Circuler grid need to be solved by Finite difference method pls help me

    Circuler grid need to be solved by Finite difference method! pls help me... hi this is the picture of the problem.. i have studied the rectangular grid but not the circular grid... now pls someone help me to find out the way to solve a heat conduction problem for circle using finite difference...
  2. D

    Electrical grid tied PV systems

    [b]1. I have not seen IEEE 1547-2003 as this question pertains to it. They say that small PV systems are tied into the grid, if the wave sign of a PV inverter is a square wave how does that marry to the wave of electricity flowing on the existing grid? Does this current just get gobbled up so to...
  3. M

    Compute the gradient of a quantiy on a grid

    Hi, this might be a stupid question, but I was wondering how to computer the gradient of a quantity on a grid. I mean I have a grid made of cells (not necessarily of the same size) where the variable \rho is defined at the center of every cell. How can I compute the gradient of this quantity? It...
  4. C

    Math noob + graphic design 3 point grid numbers equence

    First, my apologies ... my last math class back in high school, sophomore year geometry, many years ago. I am a graphic designer, but have discovered an interesting math problem and would like some help identifying what it is and how to better express and use it. Thanks for any help! And...
  5. B

    Uncovering the Truth Behind Smart Grid & Smart Meters

    In North America, awareness of smart grid/smart meters remains low. Mainstream media doesn't discuss much about this technology. People who protest against it get arrested. So, I got curious. Could you describe your biggest concern relative to smart grid/smart meters? I was told to search...
  6. F

    Need help starting a proof about an infinite square grid.

    Hi, I need help with simply starting to prove this. I'm terrible with proofs and even the easy ones are hard for me. Any tips to get started in the right direction would be appreciated. A city represented by an infinite square grid of blocks is on fire. Every day, the status of city block is...
  7. E

    MATLAB MATLAB Plot function of two variables on 2D Grid

    Hey all - this is my first post on the forum but I've browsed for help for a really long time on other topics. Any help would be greatly appreciated! So I have a function, called stability.m that takes in two independent variables, say x and y, as input and outputs either a 1 or a 0 for each...
  8. C

    How to determine spacing on parabolic grid antenna?

    Greetings, How far apart should the wires be on a 2.4 GHz parabolic grid antenna? Is it determined by the frequency? Thanks
  9. W

    How can I simulate the power grid with distribution generations?

    Hi all, i would like to know if there is anything working on power grid simulation or other related work. I'm currently working on power grid simulation and would like to talk to people with experience in it. Any idea how to simulate the power grid with distribution generations like solar...
  10. P

    Frank Wilczek's "The Grid" - Exploring the Possibilities

    I'm reading The Lightness of Being by Frank Wilczek and I'm trying to work out what credence I should give the idea of "The Grid". Several questions. Isn't his "Grid" just the same as the old fashioned idea of ether? If not, how does it differ from "ether"? How does this idea stand...
  11. P

    Wanted: video by Wilczek on The Grid

    Wanted: video by Wilczek on "The Grid" Does anyone know of a video lecture on the WWW by Prof Wilczek describing his theory of the Grid? (Suitable for someone with a basic science knowledge.) Thanks.
  12. F

    What is the Resistance Between Two Points in an Infinite Grid?

    Homework Statement What is the resistance between A i B if resistance is proportional to length, and the resistance of a side of the largest square is R? Homework Equations This is nothing more than a bunch of serial (parallel) resistors. The Attempt at a Solution n=1 => R=1 n=2...
  13. W

    Information loss as a grid is coarsened

    Hi, Not sure if this is the correct sub-forum or not. Perhaps, general math is better. Anyways.. In the following, a simple reference covering what I am after would be very helpful. Let's say you have a 4x4 grid of cells each cell contains either a 1 or 0. Let's say it is this...
  14. C

    Uncovering the Mysteries of the Root Grid

    You can chart the square roots relative to each other starting with a quarter-circle, a square, and a diagonal line. Where the circle intersects with the diagonal, the next square root is found. http://www.perspectiveinfinity.com/images/rgsteps_w.png More here...
  15. C

    Questions about power grid in US

    1) What's the voltage in the overhead power lines in residential areas? Basically how many volts is it before it gets stepped down to 120 for your house? 2) What's the typical primary inductance of a distribution transformer that does the stepping down?
  16. D

    Space time distortion grid representations

    Hi, I'm a newbie here, i joined just now purely to ask this question that's been on my mind recently. Now i apologise if this question is fundamentally wrong (which it probably is), but I'm only the average person with an amateur interest in physics :P So don't laugh. Firstly, as you know, we...
  17. F

    Asynchronous generator running off grid on capacitor bank

    can anyone tell me if it is possible to run a asynchronous generator from a capacitor bank and what it may entail.
  18. Evil Bunny

    Can a Generator Be Hooked to the Power Grid at 180 Degrees Out of Phase?

    What would happen if I hooked up a generator at my house (voltage and frequency identical) to the power grid and it was 180 degrees out of phase?
  19. D

    Constructing a mini grid for senior project

    Hey all, Well for my senior project my class has to construct a mini grid. It will be connected to 3 renewable energy sources. My team is in charge of the connections to the grid and the energy sources. My team has decided to use a PIC micro controller to interface to the other groups. I am...
  20. S

    Electrical Electron Accelerator/Decelerator grid supply

    Hello. I want to build an electron accelerator grid in vacuum. The grid, which has the purpose of accelerating or decelerating electrons produced by a nearby filament has to be electrically charged at +500V or -500V. The switching frequency between the voltages +500V to -500V has to be...
  21. M

    What is the true purpose of Smart Grid and how does it affect consumers?

    All about smart grid, New ideas and news about what's happening now in this area. Including Smart meters, Renewable Energy (Solar and Wind), Green Cars and Green IT. Lets start from the beginning What is the definition of Smart Grid?
  22. A

    Calculate # Games of Go on 19x19 Grid & Strategies to Solve

    How many possible games of "go" are there? I realize this is a ridiculous question, but what strategies would you take to solve it? A sure-fire but incredibly tedious one would be to create a giant tree diagram. And before anyone says it, the answer is not just the factorial of (19*19)...
  23. I

    Probability of Hitting Vertical vs Horizontal Lines in 2D Grid

    Hi, I have a problem (1) where I need to compute the ratio of probabilities of hitting and stopping at a positive vertical barrier x vs hitting and stopping at a negative horizontal barrier y after starting from (0,0). I feel that by symmetry, the answer to this would be the same as...
  24. DaveC426913

    Earth Map: Grid Projection

    I want a projection of Earth where distances are undistorted. i.e. 10 degrees of latitude at the equator is exactly the same map distance as 10 degrees of latitude at the Arctic Circle. As a disqualified example, the Mercator Projection has map distance increasing with increasing latitude...
  25. 1

    MATLAB Finite difference method with matlab- square grid, cavity inside

    Hi, I'm here for help and hope somebody could give a hand on this because I'm noob in this. I'm now constructing a MATLAB program to find Electrical field and potential within a square grid mesh with square cavity inside. like the picture above. I only manage up to this...
  26. Mentallic

    How many possible puzzles can be created out of the standard 9x9 grid

    I am trying to find out how many possible puzzles can be created out of the standard 9x9 grid. I was never very good at permutations and combinations, so I won't get very far here... All I can think of at the moment is that while there are 9^{81} ways to fill all the boxes with numbers from...
  27. C

    Generator output to Grid Tie Inverter

    Guys, I have a Lister generator that is capable of producing approx 5KW of power from an attached ST alternator. I am in australia so our standard power is 240v at 50hz I have a grid tie inverter for my solar panels - this unit accepts between 150v dc into 500vdc It has a single input...
  28. P

    Diamagnetic vapour + electromagnetic grid

    I know, I know. I didn't fill out the thing. But I don't really have a 'problem' to solve, I'm just looking for some vague theoretical speculation... I'm a new media art student and I'd like to use a grid of electromagnets to undulate a layer of low-lying fog (which would be glycerin +...
  29. T

    US grid power transmission via plasma

    I'm doing some classic research into the possibility of replacing copper core power transmission lines in the United States power grid with tubes designed to contain low temperature plasma. The idea is that one would be able to transmit power more efficiently and effectively in plasma opposed...
  30. P

    RPM independent grid tie induction generator

    Through our research we discover that an AC induction motor can act as a DC amplifier, as long as there is torque making it turns. Applying the process we are able to build RPM independent grid tie induction generator. Tested with variable US grid at consumer configuration. Similar to PMA...
  31. B

    Optimizing Puzzle Solutions through Grid Simulation

    "Evolving grid" simulation? I'm not quite sure what to call this problem, but basically, I am trying to solve a puzzle. It works as follows: There is a 9x9 grid Each square can either be "on" or "off" At the beginning of the puzzle, the 9 squares dead center of the grid are "on", the...
  32. K

    Square Grid and Letter Assignment Puzzle

    Place the letters A, B, C, D, E, F, G, H and I into a 3x3 square grid with each square containing a different letter, using the following information: (i) I is in the same column as E which is not in the center column. (ii) D is in the row below the row which contains F. (iii) A is in...
  33. F

    Finding islands in a grid? traversing a graph to find smaller disjoint set

    I'm working in matlab, and looking for help on how to do the following. (answers in any language or pseudocode will be fine) I have an nxn matrix, with each cell containing a 1 or a 0. The border cells are all 1's. Is there an efficient algorithm to determine if there are any "islands" of 1's...
  34. B

    C/C++ C++ newbie qu: grid construction for finite difference

    Hello everyone: I am a C++ newbie; I am interesting in using C++ in my work on coupled fluid flow-chemical reaction problems. I apologize in advance for what is probably a very simple question. I would very much appreciate any help to get me on the right track! My goal is to come up with...
  35. H

    Could dark energy have existed before the Big Bang?

    The Grid, dark energy not created at BB ? In his book “The lightness of being” page 105, Frank Wilczek says: “The concept of Grid density is essentially the same as Einstein’s cosmological term, which is essentially the same as “dark energy” “. Dark energy, contrary to the other energy...
  36. M

    Solving Logic Puzzles Without a Grid

    I always have difficulty with logic puzzles. Usually, I miss making inferences that really make the puzzle's solution flow out. Are there any good books/resources that train people on logic puzzles? (I moved this from the brain teaser forum) The kind of puzzle I'm talking about would go...
  37. P

    In this grid of 1 Ohm resistors

    http://www.xkcd.com/356/ Thoughts on the problem?
  38. G

    Secrets of the Microwave Oven: Grid Dimensions & Polar Molecules

    Homework Statement Microwave oven I. The glass window isn't important to the microwave oven's operation, but the metal grid associated with that window certainly is. The grid forms the sixth side of the metal box that traps the microwaves so they cook food effectively. What is the approximate...
  39. B

    Matplotlib- scaling the marker with the grid.

    Hi there, I am plotting some data onto a hammer plot using ipy- matplotlib. The axes on the plot range from alpha= -pi:pi and beta=-pi/2:pi/2. I have a value (lets call it delta) for each point on the plot where (alpha=integer,beta=integer). I have arranged the delta values in ascending order...
  40. R

    Python text in each grid in a grid field

    Hey iam trying to place some text in each grid in a grid field and also to fill each one with different color can anyone please help me out...
  41. T

    Ground Grid Study: Short Circuit Current Analysis

    Short Circuit Current Hi, I am reviewing a ground grid study of a substation for a wind farm that is being built. The ground grid will be for a substation with a low side of 34.5kV and two transformers that step the high side voltage up to 345kV. There are six distribution feeders on the...
  42. M

    Off-Grid Energy Options & Subsidies

    By now we have heard of all of these fascinating new technologies "just around the corner" that will "remove our energy dependence on corporate and foreign resources." In nearly every cable news interview, researchers claim that this new technology is "only five to ten years away." As a nation...
  43. W

    About battery and power grid circuits

    Hi I'm trying to deepen my conceptual knowledge about electrical systems. I'm definitely a lay level, tradesman level user here. I'm lucky if I can do some simple algebra, so I don't want a lot of math (though I might get into that later if I want to get deeper into engineering). I have...
  44. Y

    Spacetime diagram grid area

    I have an interesting finding in spacetime diagram - The area of the square grid for the rest frame O, is the same as the area of the rhombus grid for the inertial frame O'. More specifically, the area of the square for frame O (0, 0), (0, 1), (1, 1) and (1, 0) is 1 The area for the...
  45. B

    Determining the distribution of voltages in a given rectangular grid

    Homework Statement Hi, I need to calculate the voltage drop in an n by m grid. There are resistors 4 resistors connected to a square; R1 for horizontals and R2 for verticals. There's a voltage applied at point B and point A is grounded. I need to create a MATLAB function that will solve for...
  46. H

    Comp Sci Electrodes on a Grid in Fortran 77

    1. Question Statement: Create a 40 mm by 40 mm two-dimensional grid centered on point (0,0) (grid size 1mm by 1mm so the grid is 41 points by 41 points). On this grid, put four circular electrodes, one centered on each corner, each with radius 15 mm. Fix the electrodes on the upper left and...
  47. marcus

    Frank Wilczek's Vision: Exploring Grid Theory & Quantum Gravity

    Frank Wilczek has presented a way of looking at the world which is curiously consonant with Lattice Quantum Gravity approaches a la Renate Loll, John Barrett, Lee Smolin, Carlo Rovelli and others. The world as lattice---what Wilczek calls the Grid. It is oddly reminiscent of spin networks...
  48. A

    Steam Generator take me off grid.

    I have made a Solar collector out of a 10' diameter satelight dish and lexan mirrors. I have a collector that converts water to steam ( 20lb propane tank) at a rather frightening rate I must add. Now i have a dilema. Where can I buy a turbine that i can bolt onto this scary steam source...
  49. T

    Geometer's Sketchpad: How do I put a grid over an image?

    Is it possible to use an image as a background to a function graph in Geometer's Sketchpad, so that I could superimpose a grid over a map? Does anybody have an alternative suggestion if that's not possible in GSP? Thanks, -tubegeek
  50. E

    Finding Remainder of Shaded Squares in 6x4 Grid

    Homework Statement In a 6 x 4 grid (6 rows, 4 columns), 12 of the 24 squares are to be shaded so that there are two shaded squares in each row and three shaded squares in each column. Let be the number of shadings with this property. Find the remainder when is divided by 1000. There is a...
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