The formulas of the electric field of closed linear electric charge are solved on the basis of the relation of voltage and electric field,and the electric fields for linear electric field,and the electric fields for linear electric charge of circular, ellipse and square are discussed respectively as special cases.

Consideration on Sartre s "The Others Are Hell" from His No Exit;

Medusa s Eye": Comments on Jean-Paul Sartre s Philosophical Thinking in No Exit;

Further Read No Exit——On the Relationship between Sartre’s Works and His Emotional Life

It is well known that symmetry breaking and quark confinement are two open problems in theoretical physics.

In this paper we give a brief introduction to the strong interaction and the quark model, asymptotic freedom and quark confinement, high energy heavy-ion collisions and quark matter, the ALICE experiments at the LHC, and the connection between quarks and the cosmos.