نتایج جستجو برای: distance density
تعداد نتایج: 632175 فیلتر نتایج به سال:
Aging has the hallmarks of an evolved adaptation. It is controlled by genes that have been conserved over vast evolutionary distances, and most organisms are able to forestall aging in the most challenging of environments. But fundamental theoretical considerations imply that there can be no direct selection for aging. Senescence reduces individual fitness, and any group benefits are weak and w...
New, functional, concepts of skewness and kurtosis are introduced for large classes of continuous univariate distributions. They are the first skewness and kurtosis measures to be defined directly in terms of the probability density function and its derivative, and are directly interpretable in terms of them. Unimodality of the density is a basic prerequisite. The mode defines the centre of suc...
The mean pairwise velocity of galaxies, v12 has traditionally been estimated from the redshift space galaxy correlation function. This method is notorious for being highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate v12 directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy...
We find an upper bound for geodesic distances associated to monotone Riemannian metrics on positive definite matrices and density matrices.
Using mean relative peculiar velocity measurements for pairs of galaxies, we estimate the cosmological density parameter and the amplitude of density fluctuations j8. Our results suggest that our statistic is a robust and Qm reproducible measure of the mean pairwise velocity and thereby the parameter. We get and 0.17 Q Q p 0.30 m m 0.07 . These estimates do not depend on prior assumptions on th...
It is well known that estimating the pairwise velocity of galaxies, v 12 , from the redshift space galaxy correlation function is difficult because this method is highly sensitive to the assumed model of the pairwise velocity dispersion. Here we propose an alternative method to estimate v 12 directly from peculiar velocity samples, which contain redshift-independent distances as well as galaxy ...
Introduction: 103Pd is a low energy source, which is used in brachytherapy. According to the standards of American Association of Physicists in Medicine, dosimetric parameters determination of brachytherapy sources before the clinical application was considered significantly important. Therfore, the present study aimed to compare the dosimetric parameters of the target source using the water ph...
Background and Objectives: Due to the increasing use of mobile phone in recent years, the number of BTS antennas has also increased. .Proliferation of BTS antennas in cities and villages, and perpetuation of encountering with waves from one side and increasing the anxiety of many people in encountering with their waves from the other side convinced more investigations in this field. Therefore,...
Optimal Forest Road Density Based on Skidding and Road Construction Costs in Iranian Caspian Forests
Information on the productivity, costs and applications of the logging system is a key component in the evaluation of management plans for the rehabilitation and utilization of Caspian forests. Skidding and road construction costs are expensive forest operations. Determining the optimum forest road network density is one of the most important factors in sustainable forest management. Logging me...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید