What is Correction: Definition and 202 Discussions

A correction fluid is an opaque, usually white fluid applied to paper to mask errors in text. Once dried, it can be handwritten or typed upon. It is typically packaged in small bottles, lids attached to brushes (or triangular pieces of foam) that dip into the fluid. The brush applies the fluid to the paper.
Less commonly, the fluid's fumes are inhaled to create dizziness, tachycardia and euphoria, sometimes producing adverse effects.
Before the invention of word processors, correction fluid greatly facilitated the production of typewritten documents. One of the first forms of correction fluid was invented in 1956 by American secretary Bette Nesmith Graham, founder of Liquid Paper. With the advent of colored paper stocks for office use, manufacturers began producing their fluids in various matching colors, particularly reds, blues and yellows.

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  1. A

    Thermometer stem correction with pressure

    Hi everyone, So I'm a bit stuck in my physics lab report. I have to make a correction to the temperature read in the laboratory (ex:155.2C) because our room pressure was 742.1mmHg and not 760mmHg I'm guessing. I've tried researching this for a while now but I can't seem to find an easy...
  2. T

    Buoyancy Correction: Is Equation 1 Correct?

    Is this equation correct? equation 1: mass=density(density-density) Im asking this because in air correction we have equation 2: mass=density(density-density)/density(density-density) -----here we get mass.But get we mass still in this case?:mass=density(density-density) Because I was trying to...
  3. J

    Power factor correction with two loads

    Homework Statement http://i1226.photobucket.com/albums/ee410/jean28x/8b1ad092d9dd25a8f10f1672c0073d97.jpg Vs = 480<0 rms. P1 105 W; pf1 0.7 lagging; P2 5 × 104 W; pf2 0.95 leading. Homework Equations S = sqrt(P^2 + Q^2), = Vrms* Irms(conjugate)The Attempt at a Solution I know how to...
  4. Philosophaie

    Horizontal Parallax Correction

    Parallax is a way of measuring the distance of one object to another. By taking the distance of an already known object, say the Sun, and drawing a line to the object. Then drawing another line between you and the object in question. The angle you get is the Horizontal Parallax angle...
  5. Z

    How to make relativistic correction to perturbation?

    I want to know about relativistic correction to perturbation. I searched but failed to find any teaching on this topic. Is it true that we just need to replace the non-relativistic Hamiltonian perturbation terms with the relativistic ones while leaving the perturbation formulae unchanged...
  6. P

    Power Factor Correction: Solving for Complex Power and Unity Factor in a Circuit

    Homework Statement Consider this circuit. Calculate the complex power for the circuit, and correct the power factor to unity by connecting a parallel reactance to the load. Homework Equations The Attempt at a Solution My attempt: Can someone check? Thanks a lot!
  7. M

    What is the Correction Made for Van der Waal Pressure?

    I couldn't understand the pressure we take here is still the ideal pressure then wt is the correction made?
  8. M

    Accelerometer tilt error correction

    I am using arduino and accelerometer MMA7341 to measure the acceleration in x direction of an oscillating metal table. But the mounting of the accelerometer is tilted by a small angle (say Q) . Is it affect the acceleration?. If it is affect the acceleration in x direction , how can correct it...
  9. J

    What is Power Factor Correction VARS?

    Hi Guys- So, I'm new to the Power Quality world but have worked in the VFD world for some years. The term "KVARS or VARS" is new to me. Looking for a simple explanation and how they work in a system. Thanks!
  10. B

    Proof for Angle Preserving Transformation: Eigenvalues Same Magnitude

    Please read the italic part at the top of https://www.physicsforums.com/showthread.php?t=243852 Is it true if we generalize to the complex case that an angle preserving transformation's eigenvalues are all the same magnitude? Is there a simple proof for the real case? Obviously its not a...
  11. R

    Power factor correction of chiller plant

    I am new at this energy management stuff: My question is, we have a new Central chiller plant where I work that feeds 5 buildings for there A/C. The Power factor at this building is 99% when the chillers are running (outside temp above 50 degrees) but when the chillers are not running the...
  12. G

    Sunrise and sunset correction for astronomical and geographical factors

    Hi I've been meaning to find a correction method for the true location of the sun so when I add the correction to the true sun it would give me the apparent sun. To clarify, I want to be able to calculate the difference of time between sunsets or sunrises if: There were no geographical...
  13. K

    Darwin and relativistic kinetic energy correction for hydrogen

    Homework Statement Combine the Darwin correction with the relativistic kinetic energy correction for l=0 to show that the fine structure formula: \DeltaE_{fs}= - \frac{(E^{(0)2}_{n})}{2mc^{2}}[\frac{4n}{j + 1/2}-3] remains valid for l=0 Homework Equations From a previous problem...
  14. B

    What happens to normalization of wavefunction when you add a perturb correction?

    Homework Statement Consider any ket. Find the perturbative correction to that ket. Then, |n> = |n0> + |n1> Here, |n0> is the ket from the unperturbed hamiltonian (who cares what it is), and |n1> is the 1st order correction. Do you introduce a new normalization when you add the...
  15. Q

    Ampere's Law with Maxwell's correction is equivelant to Ampere's Law?

    Is it true that Ampere's Law with Maxwell's correction is equivelant to Biot-Savart Law? Under what assumptions?
  16. D

    Approximate Distribution of Y-X | P(Y-X>13) | Binomial & Normal Distributions

    Homework Statement The random variable X has the binomial distribution B(20,0.4), and the independent random variable Y has the binomial distribution B(30,0.6). State the approximate distribution of Y-X, and hence find an approximate value for P(Y-X>13) Homework Equations The...
  17. T

    Improve Power Factor of Circuit to 1: Calculations and Troubleshooting | AJUBI

    In an assignment I was asked to improve the power factor of a certain circuit to 1. The supply is 240V peek-to-peek @ 60Hz. Rs = 58 ohm, Rl = 2 ohm and L = 8 mH. Below are my calculations but I can't seem to get the right answer. Indicating where I am going wrong would be a huge help :)...
  18. R

    Maximizing Savings: Power Factor Correction Homework for Improved Efficiency

    Homework Statement Homework Equations If I want to figure out how much money we are losing because of poor power factor and the information I have is Power Factor 60% and total KWH I can take 60% of my total and then subtract that from my total then multiple the subtracted number by my...
  19. N

    What is the correction use to determine marine gravity anomaly

    Dear sir/ma'am, I am a bachelor of Survey Science and Geomatic student from Malaysia. This is my final year and I have to complete a research, where my research is about to evaluate marine gravity and satellite altimetry data on coastal region. 1. Homework Statement I am in the middle...
  20. M

    Fine structure correction in H atom

    Hi, I refer to the second edition (international edition) of Griffiths. He proves that the total fine structure correction (spin orbital plus relativistic) is given by E_{fs}^{1}\propto (3-\frac{4n}{j+1/2}) After that, he writes this. "Fine structure breaks the degeneracy in l (that is, for a...
  21. M

    2nd order correction to gauge transformation

    In the weak field approximation, g_{\mu\nu}=\eta_{\mu\nu}+h_{\mu\nu} If we make a coordinate transformation of the form [itex]x^{\mu'}=x^{\mu}+\xi^{\mu}(x)[\itex] it changes [itex]h_{\mu\nu}[\itex] to [itex]h'_{\mu\nu}=h_{\mu\nu}+\xi_{\mu,\nu}+\xi_{\nu,\mu}+O(\xi^{2})[\itex] I...
  22. D

    Relativistic correction to quantum mechanical system

    Relativistic correction to quantum mechanical system: quantum well with a particle moving in high velocity relative to lab frame (the well moves together with the particle in it). Without relativistic correction there will be a probability for the particle to be outside the well since it's...
  23. G

    More precise calculation for Acoustic End Correction needed

    Hi, I am looking for a more precise calculation for determining an accurate end correction for an open-ended pipe of a relatively high fundamental frequency and am hoping someone might be able to steer me in the right direction. Researching online I have found the general calculation of...
  24. QuarkCharmer

    Did I Solve the Integral Test Correctly for This Question?

    Homework Statement Took a test today, one question I am not sure I got right. \int_{0}^{\infty} te^{-at}dt, when a>0 Homework Equations The Attempt at a Solution I set let infinity be b, then took the limit as b went to infinity of the integral with new bounds from 0 to b. My solution...
  25. 1

    What Does Leading Correction Mean in Mathematical Contexts?

    Homework Statement Homework Equations What is a leading correction? The Attempt at a Solution I easily proved the limits, however I do not know what a "leading correction" is. I googled it and I can't seem to find a precise definition.
  26. N

    Must we add QED correction to perturbative QCD?

    Please teach me this: It seem to me that when we consider high momentum,then the strong interaction become asymtotic week force,so we can use perturbative QCD.But at the same time,when considering large momentum,the ''electric charge'' became large,then the ''electric force'' between quarks...
  27. E

    Pr(X=#): Continuity Correction

    I was wondering why it is that the Pr(x=#)=0
  28. M

    Degenerate Perturbation Theory Wavefunction Correction

    Hi, If we have a non degenerate solution to a Hamiltonian and we perturb it with a perturbation V, we get the new solution by |\psi_{n}^{(1)}> = \sum \frac{<\psi_{m}^{(0)}|V|\psi_{n}^{(0)}>}{E_n^{(0)} - E_m^{(0)}}\psi_m^{(0)} where we sum over all m such that m\neq n. When we do the same...
  29. C

    How to derive a numerator relation in vertex correction in Peskin p191

    i.e. thank you very much in advance
  30. P

    How does the density effect correction affect dE/dx in the Bethe-Bloch Equation?

    Hello all, I'm currently doing something that isn't technically coursework but I felt that this was the best place for my question, as an investigation into the properties of particles moving through matter, i have been trying to evaluate dE/dx in the Bethe-Bloch Equation...
  31. T

    Resonance Self Shielding Correction Definition

    Hello, I was hoping that someone might be able to provide a definition for the "resonance self shielding correction". -TP
  32. A

    Delta-V Correction needed after launch?

    Hi guys, I want to know - roughly - how much delta-V a satellite must expend to get from its launch insertion orbit to its final orbit. Let us assume that we're putting a LEO craft up. The launcher is has the performance to reach this orbit, and is launched at the right time and...
  33. J

    Effective Error Correction Codes for Noisy Channels in FPGA-ARM Interfaces

    I'm designing an interface between an ARM-CPU and a FPGA and have a pretty noisy channel between them. So I was wondering if anyone have any tip of error correction code on the FPGA side except the Hamming method I am using right now. What I want is a method which can correct if the...
  34. H

    The Power Factor Correction Equation

    Homework Statement An industrial electrical load operates from a 50 Hz 10 kV (rms) line with a power factor of 60% lagging. Determine a range of values of a capacitance that may be placed in parallel with the load to achieve a 90 to 95% lagging power factor. Homework Equations Power factor =...
  35. B

    Correction of Vector Operator computations

    Homework Statement A. For the vector \vec{A}=a\vec{e}_{x}+b\vec{e}_{y}+c\vec{e}_{z}, compute div(\vec{A}) and rot(\vec{A}) B. Show that rot(grad(\phi (x,y,z)))=0 for a potential function \phi(x,y,z) C. Compute div \ grad \frac{1}{r}\equiv \vec{\nabla} \cdot \vec{\nabla}...
  36. B

    Work of a Line integral correction please

    Homework Statement Compute the Work of the following line integrals in the vector field \vec{V}=(2x^{2}-3y;4xy;3x^{2}z) Homework Equations For the following lines: Curve1: \vec{r}(a)=(a,a,a^{2}); \ 0\le a \le 1 Curve2: \vec{r}(a)=(a,a^{2},a); \ 0\le a \le 1 The Attempt at a Solution...
  37. P

    Sign convention of bolometric correction

    Okay I realize that stars emit at least some radiation outside the visual range but I have seen stars with positive BC when I thought that most values are negative due to the radiant flux over all wavelengths being greater than its flux over a certain wavelength. Is the sign of the BC the same...
  38. J

    Relativistic correction for gravitational acceleration

    If you have an object traveling at a velocity v at a point where, if the object had zero velocity, its gravitational acceleration would be a, what is the formula for calculating the relativistic correction for its acceleration at this point? Does it depend on the angle between the velocity...
  39. T

    Rutherford scattering correction

    Homework Statement Hey. I've just conducted Rutherford's gold foil scattering experiment and am a little stuck on a part of the analysis. One of the objectives of the lab script is; 'To correct the counting rates measured in one plane for the fact that the foil scatters in a 3D cone'...
  40. M

    Issue with impedance/power correction

    Say I have a circuit like this: (R+L+R||L) -----20ohm---150mH------------ |......|...| Vs.......80mH 120ohm |......|...| --------------------------------- Vs = 120V @ 60Hz So I decide I want to add a capacitor across the source of 28.35uF to correct the power factor to 1. Then...
  41. E

    Calculating Self-Energy Correction to Electron Propagator

    If one wants, to calculate the self energy correction to the electron propagator(using the approach where one introduces a photon mass \mu to deal with IR divergences), one gets after some work an integral like this (this is from the Itzykson Zuber book equ. 7-34): \int_ 0 ^ 1 d\beta \beta...
  42. N

    Calculating Percent Yield for a Chemical Reaction

    Homework Statement 1. If we mix 25 grams of sodium bromide with a large amount of potassium chloride, what will our theoretical yield of sodium chloride be? 2. If our actual yield from this reaction was 18 grams of sodium chloride, what would our percent yield for this reaction be...
  43. Demon117

    How Does a Perturbation Affect Energy in a Quantum Box?

    1. Calculate the first-order correction to E^{3}_{(0)} for a particle in a one-dimensional box with walls at x = 0 and x = a due to the following perturbations: (a) H' = 10^{-3}E_{1}x/a (b) H' = 10^{-3}E_{1}sin(x/a) The Attempt at a Solution The only attempt that I have made is to...
  44. S

    Gauge Invariance and the Photon Self-Energy Correction

    Short intro.: I'm a 2nd year M.Sc. student in particle physics, with basic quantum field theory and knowledge of the SM and perhaps a bit more. I've read the forums before and tried to find questions/answers that were similar to my own until I decided, "why not just join so I can ask exactly...
  45. R

    Second order correction to the wavefunction

    Hi all, I've been doing a lot of thinking and I was wondering precisely how the 2nd order correction to the wave function from perturbation theory is derived: I mean, I can see where bits and pieces come from and I've tried to work through it as an exercise. Does anyone have a...
  46. T

    Is Quantum Error Correction the Key to Tomorrow's Information Technologies?

    Publication in Nature Photonics: European researchers report a quantum error correcting code The magazine Nature Photonics publishes in this week issue an article about the successful demonstration of a quantum error correcting code by the laboratory of Ulrik Andersen at the Technical...
  47. S

    A falling flower pot (kinematics question), just need slight correction

    Homework Statement A falling flowerpot takes 0.2s to fall past a window that is 1.9m tall. From what height above the top of the window was the flower pot dropped? g = -9.8 m/s^2, v1 = 0 m/s Homework Equations d = v1t + 1/2at^2 a = (v2 - v1) / t d = (v2 + v1) / 2 * t The Attempt...
  48. C

    How Do You Compute the 1st Order Wave Function Correction in Quantum Mechanics?

    Homework Statement A have a bit of a general question regarding 1st order wave function corrections using perturbation theory. In a problem like the infinite potential well where you have states numbered like n = 1, 2, 3, ..., how do you compute the sum for the 1st order correction when you...
  49. C

    3rd-order Energy Correction Derivation

    Homework Statement Time-independent, non-degenerate perturbation theory: - Let |k> represent k-th order wave function correction. - Let E^{(k)} represent k-th order energy correction - H' is the perturbed Hamiltonian. Want the third order energy correction: E^{(3)} = <1|H' - E^{(1)}|1> -...
  50. marcus

    Entropic force correction to Newton law by Modesto and Randono

    The paper is impressive. I'll get the link. Here http://arxiv.org/abs/1003.1998 On our 2nd quarter 2010 MIP ("most important paper") poll, I noticed that Atyy picked both of the Randono papers. It made me think about this one, that came out in March---the first quarter of 2010, so not on the...
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