In this paper we show that the introduction of an attenuation factor in the brightness equations relative to various perspective Shape-from-Shading models allows to make the corresponding differential problems well-posed. We propose a unified approach based on the theory of viscosity solutions and we show that the brightness equations with the attenuation term admit a unique viscosity solution....

Tropospheric propagation impairments that a!ect earth}space communication signals increase in severity with the increase of frequency. Introduction of satellite services using higher frequency bands such as Kaand V-band requires the characterization of propagation factors that are normally considered negligible at lower frequency bands. Cloud attenuation is considered one such factor. Clouds ar...

abstract background and aim: the purpose of the present research was to validating the revised dyadic adjustment scales for marital quality in men and women referred in sanandaj counseling centered. methods: disgn is a study of correlation sort (factor analysis of tendentious oblimin rotation sort). in this research 384 subjects(women and men) were selected from clients in sanandaj counseling c...

Rain attenuation is a major shortcoming of microwave transmission. J.S Ojo1, 2, M.O Ajewole1, S.K Sarkar2. An improved approach of predicting rain attenuation cumulative. rain attenuation formula Approach for determining the values of rain attenuation at different.Attenuation due to rain is an important constraint in the designing of the microwave. The paper presents a new prediction model of r...

Attenuation, time lag, outflow peak and storage are very essential factors required in flood risk prediction pattern. However, the accurate strongly depends on appropriate calibration of routine parameters model, such as weighting factor (x) constant (K). The being used to determine has not been given consideration previous studies this could have led inaccurate past. In work, a set data obtain...

Introduction: The main goal of SPECT imaging is to determine activity distribution inside the organs of the body. However, due to photon attenuation, it is almost impossible to do a quantitative study. In this paper, we suggest a mathematical relationship between activity distribution and its corresponding projections using a transfer matrix. Monte Carlo simulation was used to find a precise tr...

Purpose: To evaluate image quality and cardiovascular enhancement after triphasic injection in 64-slice-CT coronary angiography (c-CTA). Methods: c-CTA of twenty-two asymptomatic patients following triphasic injection (65ml-contrast bolus + mixed 30mlcontrast and 20ml-saline bolus + 50ml-saline chaser) were retrospectively reviewed. Attenuation in the great vessels, cardiac chambers, and corona...

OBJECTIVE SPECT has become a routine procedure in most nuclear medicine departments. SPECT provides significant technical challenges for the nuclear medicine technologist, as compared with planar imaging, in the areas of SPECT acquisition, image reconstruction, and data processing. Many new advances in SPECT methodology are becoming available, such as iterative reconstruction, multimodality fus...