What is Smooth: Definition and 225 Discussions

Smooth muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations. It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium.
Smooth muscle is found in the walls of hollow organs, including the stomach, intestines, bladder and uterus; in the walls of passageways, such as blood, and lymph vessels, and in the tracts of the respiratory, urinary, and reproductive systems. In the eyes, the ciliary muscle, a type of smooth muscle, dilate and contract the iris and alter the shape of the lens. In the skin, smooth muscle cells such as those of the arrector pili cause hair to stand erect in response to cold temperature or fear.

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  1. W

    Understanding Smooth Solutions to PDEs

    What exactly is a smooth solution to PDEs. I couldn't find the definition in my books, googled that and came up empty handed. I suspect the solution must be continuous with all the deriviatives.
  2. M

    Smooth deformation of a Lorentzian manifold and singularities

    How can a smooth deformation of a Lorentzian manifold possibly create one or more singularities?
  3. B

    Rotating a Perfectly Smooth Cylinder

    Consider the following model of a perfectly smooth cylinder. it it a ring of equally spaced, identical particles, with mass M/N, so that the mass of the ring is M and its moment of inertia MR², with R the radius of the ring. Calculate the possible values of the angular momentum. Calculate the...
  4. C

    Question about Smooth Interpolation

    any thoughts to this question? Give an example of a C^oo (C infinity) function f : R->R which is positive on the interval (-1, 1) and 0 elsewhere
  5. V

    Prove a function is not analytic but it is smooth

    given f(x)=\left\{\begin{array}{cc}e^{-x^{-2}},& \mbox{ if } x!=0 \\ 0, \mbox{ if } x=0 \end{array}\right show that the function is C-infinity smooth but not analytic What I have done so far (besides verify that it is continuous) is examine the first few derivatives I found they are in the...
  6. dextercioby

    Can smooth and analytic be used interchangeably?

    Can "smooth" and "analytic" be used interchangeably? My guess is 'yes'. :rolleyes: Daniel.
  7. B

    Ball height reached when rolling on inclines - rough or smooth

    I've been presented with the following problems: SITUATION: A ball is rolling without slipping with velocity v on a horizontal surface. It reaches an incline, which forms an angle \theta with the horizontal. In which situation will the ball reach the highest point, when the incline has a...
  8. R

    Does a Fourier transform exist for this (smooth) f.?

    e^{-x^2}\cos \left( e^{x^2} \right) Mathematica doesn't have an algorithm for it, does a closed form exist for the Fourier transform? It's continuously differentiable on all intervals in R, and it converges to zero at the infinities (the derivative blows up there).
  9. V

    Definition of a smooth manifold.

    Is it correct that the definition of a smooth manifold is an equivalence class (under diffeomorphism) of atlasses ? (this discussion is related to a discussion I try to start in general relativity concerning the hole argument).
  10. P

    Smooth function between smooth manifolds

    Hi. I'm a bit stuck with that next question (and that's quite an understatement): Let f:M->N be a continuous map, with M and N smooth manifolds of dimensions m,n correspondingly. Define f*:C(N)->C(M) by f*(g)=g o f. Assume now that f*(C^infty(N)) subset C^infty(M). Then f is...
  11. L

    A uniform board is leaning against a smooth vertical wall. Find torque

    A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.350. Find the smallest value for the angle , such that the lower end of the board does not...
  12. D

    Can anyone think of any examples of curves which are smooth but not analytic?

    I know there are some, but I can't think of any examples. I asked my teacher after class but she couldn't think of any either.
  13. D

    Smooth pinion/roller for friction drive

    Where can I buy smooth pinion for a friction drive system? I can't find any on web.
  14. Cyrus

    Problem with the fixed collar on a smooth rod

    I gota problem with the fixed collar on a smooth rod. The collar is like a rigid metal T shapped pipe, and the top of the t is where the shaft of the rod goes through. (Its in any basic statics book). It says this type of set up has a normal force perpendicular to the axis of the rod, (OK that's...
  15. Cyrus

    Understanding the Member Fixed to Collar on Smooth Rod Connection

    I was reviewing my book when I got to thinking about a special type of connection, the "member fixed connected to collar on smooth rod" It prevents a force in the direction normal to the rod, and also prevents a moment. The first part is fine, but the moment part worried me a little bit. Since...
  16. R

    What is the science behind brick ovens and their superior cooking abilities?

    Hello everyone, I have read on the Internet that you can get the "brick oven effect" -- uniform heat distribution and crisp bread crusts -- from a regular gas or electric oven by placing tiles and/or firebricks under the food, and tiles above the food (bricks are too heavy to go above). 1...
  17. B

    Speed of a Body on a Smooth Surface over Time

    Question:A body of mass is placed on a smooth horizontal surface. The mass of the body is decreased exponentially with disintegration constant λ. Assuming that the mass is ejected backwards with a relative velocity u.If initially the body was at rest, the speed of the body at time t is...
  18. B

    Smooth Riding: Upgrading My Bicycle with Slick Tires

    I just put slick tires on My Bicycle, my beloved Fuji. It used to have nubby tires. Now the ride is so smooth... They say that there is not a significant decrease in traction on smooth tires, because the rubber-coated nylon tires actually take on the shape of the pavement pebbles as they...
  19. S

    Dynamics smooth circular bar Problem

    I think I did this problem correctly however I am not 100% sure. Unfortunatley the Dynamics book that I have only gives answers to even numbered problems and I cannot check me work. Anyway here is the problem from the book. The smooth circular bar rotates with constant angular velocity...
  20. B

    Bouncing Particles on a smooth table

    "Particles A, B and C , each of mass m, lie at rest in a straight line in the order stated. A is projected directly towards B with velocity u. The coefficient of restitution is 0.5 in each impact that follows. Show that there will be three impacts in total and find the final velocities of...
  21. M

    News Bravo Europe Union, Shame on you France, Damn the Chinese are smooth

    Bravo Europe Union, Shame on you France, Damn the Chinese are smooth... http://news.bbc.co.uk/2/hi/europe/3637807.stm Good Job to the EU for standing ground on true human rights and democracy. Shame on France (and Germany to an extent) for looking to cash in on the Humanitarian crisis...
  22. Guybrush Threepwood

    Are Black Holes Actually Fuzzballs of Tangled Strings?

    http://researchnews.osu.edu/archive/fuzzball.htm
  23. F

    How Do You Structure a Paraboloid as a Smooth Manifold?

    i am trying to solve this problem: Give the paraboloid y_{3}=(y_{1})^2+(y_{2})^2 the structure of a smooth manifold. But i am unsure what it means by structure. Can anyone give me some help here?
  24. Greg Bernhardt

    Prove the existence of smooth solutions to a certain model

    You don't need to solve this, just tell me what problem it is... although if you do solve it you'll be a million dollars richer. Prove the existence of smooth solutions to a certain model of incompressible fluid dynamics. This is the ... problem?
  25. Greg Bernhardt

    Linux for Windows Addicts: A Smooth Transition

    Linux for Windows Addicts INTRODUCTION Everyone has a stance in the OS debates, but I've really never taken a side. I have Mandrake on one machine and I could do some commands and simple stuff, but I didn't really know what Linux was all about. I've been a Windows person forever and I took...
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