In this paper‎, ‎we discuss the essential spectrum of sum of two bounded operators‎ ‎using measure of non strict singularity‎. ‎Based on this new investigation‎, ‎a problem of one-speed neutron transport operator is presented‎.

please cite this article as: tabibi a, kashi ah, mirjalili sam, mahmoudnejad n, kashani p, salavatipour b, soltani mh. the possibility of access to the kidneys from posterior axillary line in supine position for percutaneous nephrolithotomy. novel biomed 2013;1(2):43-47. objectives: to evaluate the possibility of access to the kidneys from posterior axillary line (pal) in supine position for pe...

The diagram showing off-center nested spheres which is traditionally used to illustrate the Doppler effect, misleading and its trigonometric analysis leads errors concerning light, because electromagnetic aberration effects conform a wavefront surface that not sphere but an ellipsoid stretched along trajectory of source. Cartesian polar equations spherical ellipsoidal wavefronts are compared he...