What is Ring: Definition and 1000 Discussions

In molecular biology, a RING (Really Interesting New Gene) finger domain is a protein structural domain of zinc finger type which contains a C3HC4 amino acid motif which binds two zinc cations (seven cysteines and one histidine arranged non-consecutively). This protein domain contains 40 to 60 amino acids. Many proteins containing a RING finger play a key role in the ubiquitination pathway.

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  1. A

    Find All Ring Homomorphisms f: Z[√2] → Z 7

    I need to find all the ring homomorphisms of f:Z[sqrt(2)]->Z 7 basically I don't even know where to start. any suggestions would be great
  2. I

    1.) Net electric field and 2.) Maximum electric field from centre of a ring

    1. Problem1 statement, all variables and given/known data In the figure particle 1 of charge q1 = -8.13q and particle 2 of charge q2 = +3.63q are fixed to an x axis. As a multiple of distance L, at what coordinate on the axis is the net electric field of the particles zero...
  3. R

    Ring Magnets vs. Disk Magnets: Which Creates Stronger Eddy Currents?

    Is there a strength and/or field density difference between ring and disk magnets? I want to know which would create stronger eddy currents when dropped through a copper tube (which one would fall slower).
  4. Jorrie

    Einstein Cross vs. Ring: Understanding the Alignment of Quasar G2237+030

    The Einstein cross (G2237+030) shows 4 reasonably symmetrically spaced images of the very distant quasar, indicating that our alignment with the galactic nucleus to quasar line is fairly good. How is that it does not show an Einstein ring instead of the cross?
  5. E

    Is the Ideal I = < 6, 3 + 3sqrt(-17) > in Z[sqrt(-17)] a Prime Ideal?

    Homework Statement Take the ideal I = < 6, 3 + 3 \sqrt{-17} > in the ring Z [ \sqrt{-17} ]. Determine whether this ideal is prime or not. Homework Equations <18> = I^2 There is no element \alpha \in Z [ \sqrt{-17} ] such that 18 = \alpha^2 The Attempt at a Solution...
  6. V

    Understanding Ring Relationships and the Frobenius Automorphism

    I'm having trouble with what seemed like a trivial problem at first, but now I'm rather stuck. If R is a ring with xy=-yx for any x,y from the ring, xyz+xyz=0 must be true for any x,y,z from the ring. I'm trying to show why that is. Letting y=x yields x^2+x^2=0. Thus then breaking it up into...
  7. N

    Random Ring theory Questions

    I know that Z/(p) that is the integers mod a prime ideal is a field and I also know that: Field -> Euclidean Domain -> Principal Ideal domain -> Unique factorization domain ->Domain So I know that Z/(p) are all of these things. I also know that Z/(a) That is the set of integers mod a non...
  8. B

    Proving Subrings: Understanding the Empty Subset of a Ring

    My teacher put heavy emphases on acknowledging that a subset is nonempty of a ring when proving something is a subring of something. For the final exam, she wants to put a question with empty subset of a ring, and do subring proof. The empty subset would have "nice" description so you can do...
  9. P

    What is the definition of a characteristic of a ring?

    What is the definition of a characteristic of a ring? Is it the smallest n such that n1=0? or is it the smallest n such that nr=0 for all r in R.
  10. A

    Electric field due to a charged ring off-axis

    How can i find the electric field due to a charged ring off-axis? Actually i have two ring electrodes in parallel and i would like to know how to find the electric field at any point in between the ring electrodes?
  11. C

    The set of ring automorphisms is an abstract group under composition

    Homework Statement Aut(R) denotes the set of ring automorphisms of a ring R Show formally that Aut(R) is a group under composition. Homework Equations The Attempt at a Solution I Have a very similar question to which I have the solution viz Aut(G) denotes the set of group...
  12. A

    Double Ring Electrode Trap: Build Project

    I am trying to built a double ring electrodynamic trap for aerosol particles. Please suggest me for this project. Thanks
  13. N

    Particle on a ring question φimNe=Ψ

    Homework Statement How do I determine the normalization constant, N for a particle on a ring with wave function Ψ= Ne^(imφ) ? Homework Equations The Attempt at a Solution
  14. zoki85

    Which Ring Glides Farther? Explaining the Physics

    Suppose two cooper rings,each having the same surface smoothness and of same size(geometry).The only difference is that interior of the first ring is hollow while of the second isn't.m1<<m2. If we send two rings,with same inital velocities,to glide across a frozen long path of ice,which one...
  15. E

    Notation of ideals in ring theory

    So right now I'm trying to solve this problem in ring theory for homework. The question pertains to proving that in a PID, D, if a,b are elements of D then the gcd of a and b can be written as a linear combination. In any event I know where I have to go but I'm stuck on this one bit of notation...
  16. P

    Are 0 divisors always paired in a ring?

    Definiton If a and b are two nonzero elements of a ring R such that ab=0 then a and b are divisors of 0 or (0 divisors). In particular a is a left divisor of 0 and b is a right divisor of 0. My question is if you have a0=0 then a is not a 0 divisor? So it seems that 0 divisors will...
  17. M

    Calculating Electric Field for Charged Ring on x,y Axes

    Homework Statement I have the field at the center of a charged ring on the x,y axes (top half has charge density of -lambda, bottom is +lambda lambda=la) to be E=(lay^)/(2pi epsR) (eps=epsilon) i can't find the potential for this, R=radius, Can anyone help? Homework Equations...
  18. S

    E field from half ring of charge.

    Homework Statement How do I find the electric field from a semi-ring of charge at the center of the would-be circle? Does that make sense? Or another way: If the semi-circle of charge is centered at the origin, what is the electric field at the origin? I hope you know what I mean now. the...
  19. S

    Force exerted onto the pipe by a shrunk fit ring

    hi, this is my first post here in this forum. i would like somebody here to help me in calculating the force exerted onto the pipe by a stainless steel ring of 10mm thickness, when it is shrunk fit on to the pipe by heating. thanks in advance
  20. L

    Ring expansions:when do thy happen

    Hi, I'm having some difficulty predicting favourable rearrangements in alicyclic carbocations. When, why and how does a ring in a carbocation expand? I've seen some drawings (not sure whether they are correct though) where tertiary carbocations undergo ring expansion to a secondary...
  21. D

    Uniformly Charged Ring problem

    ok here goes, A uniformly charged ring has a radius equal to 10.0cm and a total charge of +12.0nC. An electron is placed on the ring's axis at a distance of 25.0cm from the center of the ring and is constrained to stay on the axis of the ring. The electron when it reaches the center of the...
  22. G

    Proving Norm Difference in Euclidean Ring Z[{\sqrt 2 \over 2}(1+i)]

    While I'm on the topic, here is another ring I need to show Euclidean. I'll show more of the work this time too. The ring is Z[{\sqrt 2 \over 2}(1+i)] So, using the standard norm difference approach, we pick any element alpha in the field and try and show we can always find an element beta in...
  23. G

    Euclidean Ring of Z[\zeta]: Unconventional Technique

    Let \displaystyle{\zeta = e^{{2\pi i} \over 5}} I need to show that Z[\zeta] is a Euclidean ring. The only useful technique I know about is showing that given an element \epsilon \in Q(\zeta) we can always find \beta \in Z[\zeta] such that N(\epsilon - \beta) < 1 (using the standard norm for...
  24. J

    There are no ring homomorphisms from Z5 to Z7

    I just need confirmation. I have a problem in my algebra class that says: Prove that there are no ring homomorphisms from Z5 to Z7. I have the following definition of ring homomorphism: Let R and S be rings. A function R to S is a ring homomorphism if the following holds: f(1R)=1S...
  25. K

    Atlantean ring (talisman)

    "Atlantean ring" (talisman) Have anyone heard about this "wonderful" talisman?, :confused: :confused: according to webpages and internet, can provide you "prosperity and luck", :!) :!) they're sellling just for 40 €€ but i don't know if there are some "scam" about it what's your opinion :mad...
  26. J

    Ring Oscillator: Learn How It Self-Oscillates & Where Its Energy Comes From

    Hello All, I was talking to one of my EE friends and they were telling me about this thing called a ring oscillator which could oscillate by itself simply by connecting a bunch of diodes in a loop. I was just wondering if someone could give me more information about this. I'm specifically...
  27. M

    Finding area of elliptical ring (phase space)

    To make a long story short, the problem has an elliptical ring from width E to E+dE in phase space (p on y axis, x on x axis). This is a harmonic oscillator, so the standard equations apply (E=p^2/2m + kx^2/2)... now for the question I need to find the total area in the ring of the ellipse in a...
  28. MathematicalPhysicist

    Calculating the Angle at which a Hanging Ring Will Rise with Two Sliding Beads

    a ring of mass M hangs from a thread, and two beads of mass m slide on it without friction. the beads are released simultaneously from the top of the ring and slide down opposite sides. show that the ring will start to rise if m>3M/2, and find the angle at which this occurs. what i did: i...
  29. D

    Electric Field due to a Ring of Charge

    I've been stuck on this problem for awhile now.. At what distance along the central axis of a ring of radius R and uniform charge is the magnitude of the electric field due to the ring's charge maximum? Now, I know that the equation for this problem is E = [k|qz|] / [(z^2+R^2)^3/2], which...
  30. Math Is Hard

    Free Mosquito Ringtone | Painful Warning!

    Can you hear it? I can't. My ears are too old. :frown: http://www.freemosquitoringtone.com/offer.asp?gclid=COHXudCry4UCFU1dDgodVAWW2w *warning - just in case you don't read further than this post, a few people have mentioned later in this thread that this tone is actually painful*
  31. A

    Proving Commutativity in a Ring with s2 = s

    Let S be a ring such that for all s in S, s2 = s. Prove that S is commutative. I've proved that for all s and t in S, (s + t)2 = s2 + t2, and also that s + s = 0. How would I go about proving that for all s and t, st = ts? Thanks. By the way, this isn't exactly homework, I was just...
  32. Amith2006

    What is the increase in area of the ring?

    Sir, The diameter of a metal ring is D and the coefficient of linear expansion is y. The temperature of the ring is increased by 1 degree Celsius. What is the increase in area of the ring? I solved it the following way: Coefficient of superficial expansion = 2y Initial area of the...
  33. S

    X^3=x => R is a commutative ring

    If R is a ring, and has the property that x^3=x for all x in R, then show R is commutative. Generalize for x^k=x, k an integer >3. I can do this for x^2=x. First use x^2+x^2=x+x=(x+x)^2 = 4x^2 (abusing notation a little) which means x^2+x^2=x+x=0, ie, x=-x for all x in R. Then...
  34. P

    Induced Current in Aluminum Ring Around Solenoid

    An aluminum ring of radius 5 cm and resistance 0.003 ohms is placed around the center of a long air-core solenoid with 1000 turns per meter and a smaller radius of 3 cm. If the current in the solenoid is increasing at a constant rate of 270 A/s, what is the induced current in the ring? B=...
  35. I

    Ideals in the ring Q[X]

    Consider the ideal I of Q[x] generated by the two polynomials f = x^2+1 and g=x^6+x^3+x+1 a) find h in Q[x] such that I=<h> b) find two polynomials s, t in Q[x] such that h=sf+tg
  36. E

    Electric current in a rotating ring

    I'm currently stuck on this question on the image attachment. Any help would be definitely ppreciated. Ok, so from what I understand, it asks what is the current that passes through the fixed line. For part (a), I see that the current is 'discontinuous', and I'm not enitrely sure how to solve...
  37. F

    Is a Ring Accelerator the Same as a Cyclotron?

    Is a ring accelerator the same as a cyclotron? If not can someone please tell me somthing about ring accelerator, or send me links where I can find some information about ring accelerators.
  38. T

    Ring and Linear Transformation

    Let g(x)\in F[x], T\in L(V). Let F[T] be a ring generated by g(T). Show that if g(T) is invertible, then g^{-1}(T)\in F[T]. No idea what do do.
  39. X

    Magnetic monopole induces current in perfect conducting ring

    I am trying to calculate the current induced in a loop assuming a magnetic monopole exists. The loop is a perfect conductor, which I understand implies the electric field inside must be zero. I picture the problem with the magnetic monopole traveling with a velocity coaxial with the loop. I am...
  40. Z

    Ring Theory: Introduction and Beyond

    I'm searching for some online text concerning an introduction and somewhat more advanced topics in ring theory. ps:if you come across on notes for Model theory it would be great too,thx.
  41. L

    Fun problem in calculating the electric field in the center of a charged ring

    This needs to be done with Coulomb's Law: A ring of radius R has a charge distribution on it that goes as \lambda (\theta)= \lambda_0 sin \theta as shown in the figure below: http://img506.imageshack.us/img506/8898/naamloos2iz.th.gif In what direction does the field at the center of...
  42. G

    Solving Problems in Projectile Motion, SHM of Charge Ring & Electric Quadrapole

    i have a few problems that i was struggling with. Projectile motion: An electron is fired in an electric field E=-720j. Its launched with a velocity of 9550 m/s. if you want the x distance it travels to be 1.27mm, what are the two values of theta that will work? how long does it take...
  43. loseyourname

    The Extended Soundtrack for Fellowship of the Ring

    Just came out, with every minute of music from the film on disc (three full hours of score). This is great. I have to go now. Gandalf just fell to the Balrog and I need a moment with the hobbits (for pity's sake!). http://www.lordoftherings-soundtrack.com/
  44. G

    Electrical Potential of a Uniformly Charged Ring

    I am stuck on this problem: I started this problem by looking at the electric potential of a ring, which is: V=\frac{kQ}{\sqrt{R^2+z^2}} So then if it varies in the thickness of the ring, would it be reasonable to have it be: V=\frac{kQ}{\sqrt{(R_{out}-R_{in})^2+z^2}} Or would I...
  45. Lisa!

    Looking for a Valentine's Day gift? What about this diamond ring?

    A very intelligent, humorous, wise and handsome guy with a degree in anything (preferably not physics and art), who would buy me this http://www.ashford.com/product/index.asp?sn=458045054&md_id=1&pf_id=40646&dept_id=60&comp=Y on Valentine's day! :blushing: Intelligent: IQ > 150 Handsome...
  46. S

    The view from a ring singularity?

    I have been doing some thinking about the collapse process inside a rotating black hole. (I think that the probability of creating a non rotating black hole with its point singularity and awkward infinities is so unlikely as to be not worth bothering about). Note this analysis requires no new...
  47. L

    Final temperature of sliver ring in calorimeter

    A 25.5 g silver ring (Cp = 234 J/kg times degrees C) is heating to a temperature of 84 degrees C and then placed in a calorimeter containing 5 x 10 to the negative 2 power kg of water at 24 degrees C. the calorimeter is not perfectly insulated, however, a 0.140 kJ of energy is transferred to...
  48. T

    How does one compute the number of ring homomorphisms

    How does one compute the number of ring homomorphisms from \mathbb{Z}_2^n to \mathbb{Z}_2^m? Or, likewise, the number of linear mappings on those two vector spaces?
  49. P

    Ethyl Group in a Benzene Ring: Exploring Bromobenzene

    Does bromobenzene mean that a bromine is bonded to every carbon in the benzene ring? When it saids 1-ethylbenzene where do i put the ethyl since benzene is in a ring? Thx in advance
  50. Mk

    Ring in the New Year: Celebrate 2021!

    Happy New Year! Yay! Its going to be the new year in about 5 hours and 10 minutes for me. Happy NEW YEAR fellow PFers!
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