Recent content by athosanian

so if the dipole moment of the unit cell is because the Ti atom is in 4+ state. So when is the Ti atom in the 4+ state ? for a perfectly symmmetric cell or distorted cell ?

hi, in perovskite crystal, such as BaTiO3, due to the off-centre of Ti ion, there exists a polarization moment in the unit cell (as shown in below link). my question is: does the disposition of Ti atom lead to separation of electron cloud from the nuclei of the Ti atom and so the Ti atom plays...

thank you, ZapperZ, you gave me a good advice. I will try. But I still do not find some people who study this field around me.

Hi, haushofer, thank you very much ! you recommends much useful information for me. sorry that I was not able to response in time due to some troubles I confronted.

Hi, I am very interested in superspring and M-theory and hope to begin reserches on these fields. Could anone provide me some advice on how to enter into this field ? or could anyone suggests some foremost paper for me to read ? Thanks a lot ! by the way, I am a student studying physics...

actually speaking, it is a little disappoint to me. but it is also interesting.

nice, Truecrimson, thank you very much !

Thanks a lot, Tollendal, you are really very helpful !

Thanks, bill, u r nice

hello, I heard that in 2012 someone did an two-slits experiment in which they can detect which slit the photon passes without destroying the interference pattern. Is this news a fact or not ? if it is a fact, anyone could give me the paper to read ? thanks.

Thant means the thickness of the ferrite bead is unity

I don't think you can move down just by throwing your hand up, becuase as a whole you are under no force at all. Maybe you can rotate yourself in the space, but the center of mass of your body cannot move at all.

yes, I put the L into the E-L equation, could derive the Newton's equaiton of motion. But I think it is very smart to work out the lagrangian.

thanks, I understand how to derive the Hamiltonian from Lagrangian., however, the file gives the Lagrangian directly without any reason.

hello, how to derive the hamiltonian for a free electron in electromagnetic field mathematically ? for a first step what is the lagrangian for a free electron in the EM field in classical mechanics ? the physics textbook always like to give the results directly.