E guarda questo invece:
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\chapter{The critical magnetic field}Critical current density $f_c=$ limit for resistanceless current in superconductor.
Meissner effect: Resistenceless surface current cancel flux from inside material ($\Phi=Li$). This current we call shielding current $f_L$.
If strength of the external magnetic field increases, the shielding current $f_L$ increases.
Eventually shielding current $f_L$ reaches value equal to critical current density, $f_L$ becomes $=f_C$. Then material loses its superconductivity and flux is no longer cancelled.
Exist a limit $B_C$, critical flux density when supersonductivity is lost. This is all way written in a form of critical magnetic field strength, $H_C=B_C/\mu_0$. People talk about critical magnetic field, and use symbol $H_C$.
In addition to shielding current $f_L$, in superconductor can exist current from external current source. We call this \lq\lq{transport current}\rq\rq $f_T$.
Total current $\overline{f_S}=\overline{f_T}+\overline{f_L}$ must remain below critical current $f_C$ to have material in superconducting state.
`E ora come la mettiamo?
Come la mettiamo? Prima cerca di scrivere in inglese.
Cominciare una frase con “Exist a limit” dimostra una conoscenza molto approssimativa dell’inglese. L’intera frase
Exist a limit $B_C$, critical flux density when supersonductivity is lost. This is all way
written in a form of critical magnetic field strength, $H_C=B_C/\mu_0$. People talk about
critical magnetic field, and use symbol $H_C$.
non vuol dire nulla (a parte gli errori grammaticali). “This is all way” non esiste. Nessuno, in un contesto di articolo scientifico, scriverebbe mai “people talk”.
Ovviamente un testo sconnesso e sgrammaticato non potrà mai avere una buona resa; non andare a capo a casaccio, ma prima di tutto controlla la grammatica.
The critical current density $f_c=$ is the limit for a resistenceless current in a superconductor. We recall the \emph{Meissner effect}:
“a resistenceless surface current cancels a flux from inside material ($\Phi=Li$)”. If the strength of the external magnetic field increases,
also the shielding current $f_L$ increases.
Da “eventually”, che non significa “eventualmente” ma “certamente”, “definitivamente”, non si capisce quasi nulla.
Ciao
Enrico