We derive closed-form expressions for the distribution of export intensity when firm-destination-specific revenue shifters are distributed gamma, Fréchet and Weibull in a two-country model trade with isoelastic demand. estimate parameters governing each type shifter across 72 countries. compare model’s fit to countries lognormal, gamma Fréchet/Weibull. While lognormal slightly outperforms other...

In order to reliable data transmission of wireless sensor network (WSN) in indoor environment, the indoor field intensity distribution and transmission characteristics of electromagnetic wave were researched. First of all, the 3D model in specific indoor environment was built by the finite difference time domain method (FDTD).Then, layout of room, different furniture, position of field source a...

In order to study the space distribution characteristics of light scattering from random rough surfaces, the linear filtering method is used to generate a series of Gaussian randomly rough surfaces, and the Kirchhoff Approximation is used to calculate the scattered light intensity distribution from random metal and dielectric rough surfaces. The three characteristics of the scattered light inte...

In this paper, a novel tactile photoelastic transducer for normal forces is presented. When a normal input force profile is applied to the transduction medium, stress is generated in the photoelastic layer making it birefringent. Consequently, circularly-polarized input light becomes elliptically polarized at the output due to the introduction of a phase-lead distribution. If a circular-reflect...