To solve noises affecting the performance of laser communication system problems, this paper studies mathematical model in atmospheric attenuation condition, sets up atmospheric attenuation coefficient of the primary factor aerosol (haze) according to the absorbing and scattering characteristics of the atmosphere, gives output SNR(Signal to Noise Ratio) models under atmosphere attenuation based...

The excess ultrasonic attenuation caused by adding glycogen and inorganic phosphate to liver homogenates has been studied to determine the underlying differences between attenuation coefficients of normal and diffusely diseased livers. Results show that glycogen has a higher than average specific absorption coefficient compared to other large molecular weight biomolecules. Since the glycogen co...

Calculations on shielding are required for the building of a gamma ray radiography exposure room to ensure worker radiation. A measurement used evaluate radiation diffusive and absorption characteristics medium is linear attenuation coefficient ( ). Despite fact that, as moves through medium, its influenced by wavelength well thickness composition crucial in interaction with matter. This resear...

Ultrasonic backscattering measurements by means of spatial averaging technique were carried out in steel to determine the ultrasonic attenuation coefficient. The attenuation coefficients were evaluated from the exponential decay of the backscattering signal. The results were compared with those obtained by evaluating the amplitude decay of the main pulse. Good agreement is observed provided the...

[Abstract] We report an outstanding phenomenon related to the X-ray attenuation induced by carbon nanotubes (CNTs). We observed that the mass attenuation coefficient of CNTs was significantly higher (> 100%) than that observed for highly oriented pyrolytic graphite (HOPG) and fullerenes (C60). The attenuation coefficient of CNTs increased by reducing the sample thickness. This attenuation pheno...

The world is changing, and consequently so are policies on the use of natural resources. One most convenient ways to reduce consumption aggregates in production more sustainable construction materials recovered industrial by-products. In this study, concretes designed using siderurgical from electric arc furnaces, taking advantage their high density them as radiation shielding concrete. To veri...

The main objective of this study is to evaluate the workability of fresh portland cement concrete while it is still in the mixing truck by determining fundamental rheological parameters (plastic viscosity and yield stress). Nine concrete mixtures with different values of yield stress and plastic viscosity were tested in a concrete truck. The measurements made with the truck were based on the ty...

We estimate the optical signal for an oceanographic lidar from the one-dimensional transient (time-dependent) radiative transfer equation using the discrete ordinates method. An oceanographic lidar directs a pulsed blue or green laser into the ocean and measures the time-dependent backscattered light. A large number of parameters affect the performance of such a system. Here the optical signal ...