In general, the stiffness and
surface density were the main factors that affect the soundproofing efficiency of single plates.
The characteristics of the tested fabrics were determined according the standards: the thread density according to LST EN 1049-2 [11], linear density and
surface density according to LST ISO 3801 [12], and the thickness of the material according to LST EN ISO 5084 [13].
where [D.sub.2n], [D.sub.1n] are the normal components of the electric displacement vector: [D.sub.2n] = [[epsilon].sub.0][[epsilon].sub.2] [E.sub.2n], [D.sub.1n] = [[epsilon].sub.0][[epsilon].sub.1] [E.sub.1n] [epsilon].sub.0] = 8.85 [10.sup.-12] F/m is the electric constant; [[epsilon].sub.1], [[epsilon].sub.2] are the dielectric permeabilities of dielectrics, a is the
surface density of electric charges; [E.sub.1n], [E.sub.2n] are the normal, [E.sub.1t], [E.sub.2t] are the tangential components of the electric field strength vector of the first and the second dielectrics, respectively.
Like in the case of GaN NWs, the
surface density of the InN NWs arrays is pretty high.
To understand star formation in galaxies, the relations between star formation rate
surface density [SIGMA] SFR and gas
surface density [SIGMA] gas must be determined.
Therefore, the partition function for the random walk of an electrostatic field generated by means of 2N static parallel randomly charged planes where half of them have a charge
surface density [sigma] = 1/A and the other half has a charge
surface density [sigma] = -1 / A is given by
Four different individual membranes were manufactured with a varying
surface density in grams per square meter (GSM) to be 6, 10, 25, and 40 g[m.sup.-2], designated as PUR06, PUR10, PUR25, and PUR40.