Search results

  1. Sivasakthi

    Thermal Expansion of aluminium

    Actually what I focussed was in the size variation.Yeah mechanical stresses are needed for fracture. What I wished to point out was the role of defects or dislocations. They act as carriers of heat as well as for the fracture of materials upon the action of mechanical force.
  2. Sivasakthi

    Thermal Expansion of aluminium

    Hi.. What I wish to say is that the temperature that you measure is an average quantity right? It is that due to the self vibrational energies of all the atomic constituents in the material. When you expose it to more heat, it increases their vibrational energies and these vibrations on an...
  3. Sivasakthi

    2 very difficult light ray diagram questions -- help please

    Hi...the line passing through the center will be straight like you did. But the other lines do not go straight. They get deviated through..
  4. Sivasakthi

    Continuum mechanics in solids

    The macroscopic behavior depends on the type of material we take. So, I guess there should definitely be constraints for the different materials ( whether or not these constraints are of same degree needs to be checked). Actually I am confused if we can have a general equation or approach for...
  5. Sivasakthi

    Continuum mechanics in solids

    SteamKing, it is not just to know how do these materials deform; but yeah that definitely is the thing that I need. Above all it is that I want to know how to approach that method of dynamics. Anyways thanks a lot for that reference you made :)
  6. Sivasakthi

    Continuum mechanics in solids

    Thanks Chet.. But my confusion is how can we include all those length scales all together . I do think their degree of impact upon macro scales are different. So is it possible to take a general length scale and form an equation for the dynamics? Or do we have to consider them separately?
  7. Sivasakthi

    Choosing appropriate length scale in condensed matter

    Even if we do have a method, how will that allocate all the scales? How can we know about the degree or a range to which a particular scale has importance? I believe there should be some critical length scale for dealing with a situation like this..
  8. Sivasakthi

    Continuum mechanics in solids

    Hi all.. I am currently doing some works on the continuum mechanics. And trying to study the macroscopic behavior of solids ( for simplicity, taken homogeneous materials) upon the action of external force ( which is the stress; pressure). How is it possible to account for the changes that can be...
  9. Sivasakthi

    Choosing appropriate length scale in condensed matter

    Hi.. I was reading some papers on continuum dynamics and its application to various material dynamics. The determination of macroscopic behavior is being studied , considering phononic interactions. As a material consists of phonons of various wavelengths, it is necessary to account for various...
  10. Sivasakthi

    Why we always say that time is forward?

    So does it mean that everything in this universe is preplanned?How can we think about past and future then?actually i didn't mean to point it as past and future.But to make clear i should do that.Since it is made a point that we always relate the frame with some other frames,how future and past...
  11. Sivasakthi

    If time didn't exist could anything move or even happen?

    What I could understand till now is that whenever we say that we are at a particular place or something is in a particular position, we always relate it with time.Because time itself doesn't have any existence.The space that we live in is not just the space,but it is space-time.So if no...
  12. Sivasakthi

    Why we always say that time is forward?

    I have a doubt.Don't know if there is any significance in asking this.But i would like to know the reason why we always say that time is forward?Does it mean that it is always continuous?Can somebody help me please?
  13. Sivasakthi

    Antisymmetry of fermions

    Thanks a lot for your replies.I am having another doubt regarding the antisymmetry of two electrons.Electrons being fermions are antisymmetric.But does it have any sense if we are asked to create a symmetric state for them?
  14. Sivasakthi

    Antisymmetry of fermions

    Again its confusing.That operator corresponds to which state?The state that is described here contains so many quantum states such as momentum spin etc..The state is a null vector represents that there cannot be any such possibility.So does it be valid for all the quantum states?
  15. Sivasakthi

    Antisymmetry of fermions

    So does it mean that there exists many other possibilities than spin through which we may distinguish the identical particles?I thought the complete wave function includes only the spacial and spin parts.And as the particles get interchanged, their spacial wave functions remain symmetric and...
  16. Sivasakthi

    Antisymmetry of fermions

    Hi, Can we say that the antisymmetry in the total wave function is because of the antisymmetry in spin?The exchange of particles just deals with their spacial symmetry...so finally ends with Pauli's principle...am i correct?
  17. Sivasakthi

    Antisymmetry of fermions

    I have a doubt regarding the antisymmetry in the wave function of fermions.The antisymmetry is in the complete wave function or it is in the spin?
Top