In this study, a new closed-form expression is developed to determine the equivalent electromagnetic parameters (permittivity and permeability) of biaxial anisotropic honeycomb radar-absorbing materials (RAMs). Based on medium theory, nonmagnetic substrate absorbing coating structure are one kind material, then, effective properties irregular hexagonal (compressed or stretched) honeycombs obtai...

A method is presented to characterize general sound-absorbing materials through a pole-based identification of the equivalent fluid. This accomplished by 1) determining extended fluid material sample transfer function (TFM), 2) acoustic response poles effective density and compressibility, 3) build compressibility from associated local response. Real pole pairs describe dissipative medium (or e...

Abstract Multilayer gradient absorbing materials are difficult to be modeled and simulated in practical applications. To solve this problem, a method of the inversion equivalent electromagnetic parameters multilayer based on annealing algorithm is proposed paper. The reflectivity material different forms polarization obliquely incident at angles calculated, then used calculate incidence angle s...

The attenuating properties of several types of lead (Pb)-based and non-Pb radiation shielding materials were studied and a correlation was made of radiation attenuation, materials properties, calculated spectra and ambient dose equivalent. Utilizing the well-characterized x-ray and gamma ray beams at the National Research Council of Canada, air kerma measurements were used to compare a variety ...

The delivery of accurate proton dose for clinical trials requires that the appropriate conversion function from Hounsfield unit (HU) to relative linear stopping power (RLSP) be used in proton treatment planning systems (TPS). One way of verifying that the TPS is calculating the correct dose is an end-to-end test using an anthropomorphic phantom containing tissue equivalent materials and dosimet...

New bi-layer PFSA membranes made of Nafion® NRE212 and Aquivion™ E79-05s with different equivalent weights are prepared with the aim of managing water repartition in the PEMFC. The membrane water transport properties, i.e. back-diffusion and electroosmosis, as well as the electrochemical performances, are compared to those of state-of-art materials. The actual water content (the inner water con...

In this paper we propose a new equivalent circuit model of organic light emitting device (OLED). The physicalbased model is considering the effect of high built-in voltage existing between the organic materials and the effect of non-ideal ohmic occurring at the contact between metal and organic. Compared with the measured IV data of RGB OLED samples and the result of conventional OLED model, th...

A study was conducted to evaluate the radiation transmission through lead equivalent aprons that are used in a radiology department. A large area beam (poor geometry) was employed for the transmission measurements, and backscatter was simulated by placing 7" of Lucite behind each apron. Separate ionization chambers were used to measure the incident and transmitted x-ray beams. Transmission meas...