Comment on “The electromagnetic momentum of static-charge distributions,” by Jerrold Franklin [Am. J. Phys. 82, 869–875 (2014)]

On the electromagnetic momentum of static charge and steady current distributions

Faraday’s and Furry’s formulas for the electromagnetic momentum of static charge distributions combined with steady electric current distributions are generalised in order to obtain full agreement with Poynting’s formula in the case where all fields are of class C, i.e., continuous and continuously differentiable, and the integration volume is of finite or infinite extent. These three formulas ...

Comment on "The dependence of homogeneous nucleation rate on supersaturation" [J. Chem. Phys. 141, 024307 (2014)].

Comment on “ Geometric absorption of electromagnetic angular momentum ” ,

The core theorem on which the above paper is centred—that a perfectly conducting body of revolution absorbs no angular momentum from an axisymmetric electromagnetic wave field—is in fact a special case of a more general result in electromagnetic scattering theory. In addition, the scaling of the efficiency of transfer of angular momentum to an object with the wavelength and object size merits f...

investigation of effective parameters on the rigidity of light composite diaphragms (psscb) by fem

در این رساله با معرفی سقف های psscb متشکل از ترکیب ورق های فولادی ذوزنقه ای و تخته های سیمانی الیافی به عنوان سقف های پیش ساخته (سازگار با سیستم سازه ای قاب های فولادی سبک) به بررسی پارامترهای موثر بر صلبیت سقف، پرداخته می شود. در تحقیق حاضر ابتدا به مدل سازی دو نمونه سقف آزمایش شده، به روش اجزاء محدود با استفاده از نرم افزار تحلیلی abaqus ver 6.10 پرداخته شده است. نمونه های ساخته شده تحت اعما...

NOTES AND DISCUSSIONS Comment on “Hot gases: The transition from the line spectra to thermal radiation,” by M. Vollmer †Am. J. Phys. 73 „3..., 215–223 „2005...‡

I call attention to several errors in a recent article by Vollmer that invalidate his explanation for how the line spectrum of atoms is transformed into the continuous spectrum of thermal radiation. Following Einstein’s 1916 derivation of Planck’s black-body formula, the transformation of this line spectrum to thermal radiation at discrete frequencies associated with these transitions has been ...