Recent content by maajdl

I have read a little about cqed, "circuit quantum electrodynamics". I would be interested in references to dig a qbit deeper in this topic! I have seen lumped circuit diagrams for superconducting qbits. The correspondance between classical and quantum models for these circuits is really...

Usually T0=273.15 K , p0=1atm Thanks for any suggestion Michel

In the industry, coal and other fuels are typically represented by - their C, H, O, N, S elemental composition for the combustible part - the composition of the ashes (SiO2, Al2O3, Fe2O3, ...) - the Low Heat Value (LHV) which is the heat that can be extracted from combustion product With...

Good idea. The analogy with a chain of oscillator, is very intuitive indeed, since it is pure mechanics. I should also remember the analogies Maxwell and other at that time had in mind when building electrodynamics. A canonical change of variable and the usual correspondence principle will do...

Hello, I am freshly retired and enjoy going back to the fundamentals. I followed the wonderful courses by Alain Aspect on Coursera on Quantum Optics 1 and 2 . The quantization of Electrodynamics is really easy stuff. Just follow the correspondence between Poisson brakets and Commutators ... and...

See this for spherical coordinates on mathworld: And from wiki for cylindrical: In any case, the problem you mention with the 1−e−... would not occur because of the expression for the Laplacian. Where did you get your expression for the Laplacian?

Hello, From wikipedia, this is the partition function for a "classical continuous system": This is the pillar of classical statistical physics, but it can be seen as a mere kind of "mathematical transform" . It can be used even without thinking to statistics or temperature. If we focus only...

Hello, I would be interested in a collection of experimental data for the Michelson-Morley Experiment . I would like to see if there would be many data available, and if a statistical analysis could be of some fun. Would you know some compilation of data? Thanks, Michel

You are right: A global model -that does not decompose into elements- can find a solution respecting the 1st and 2d principle. However, it does not necessarily provide the correct solution. When this occurs, there is no way to get the same result with elements in series without allowing some...

Hello, I am developping a Python (/Pyomo) package for simulation and optimization of some industrial processes. I want to create global (simplified) models for heat exhangers (and more) and avoid differential equations. (to decrease the number of variables of the problem) Most often the...

How did you lower the indices to get the density in §3 ? I think the density in §3 is not covariant and it is then incorrect. There must be elements of the metric tensor missing in the density of §3 .

Every year since the 90's I come back to some of my pet topics in physics, like statistical physics. This time it was the reading of a Wikipedia article on entropy that surprised me. The derivation of the second law from the Gibbs entropy was unknown to me. I didn't know how heat, how change of...

My rejection is not so much about the tools. It is more because of my professional environment where standards are pushing people to do crazy things. We have hundreds of engineers all using Excel as computing tool. I have tried for many year to overcome these limitations, by pushing some java...

Hello, Since a few months I enjoy learning and using Python, Julia, R, Jupyter. I abandoned Fortran long ago. Today, I decided to break with the more recent past. I will stop computing in Excel and C#, (mainly for process simulation, since more than 10 years) ... I would also like to stop...

Sorry! Just realized my mistake. The vector field in cylindrical coordinates should read: (vr,vt,vz)=(cos(t),-sin(t),0) . Then it fits.