In this paper, we propose two regularization approaches for the Boltz-mann collision operator. The constructed operators preserve the mass, momentum and energy; their equilibrium states are Maxwellians and they satisfy the H theorem. In the rst approach, the regularization consists in allowing microscopic collisions which do not exactly preserve energy and momentum. However, the limit of the mo...

Increased emphasis on aircraft inspection to ensure aviation safety has resulted in the need for a better trained workforce of aircraft maintenance personnel. As almost 90% of inspection is visual in nature, it has led to the development of computer simulators to train human inspectors performing the inspection task. However, the lack of immersion and interaction has led to limited effectivenes...

The Mann-Whitney U test is frequently used to evaluate treatment effects in randomized experiments with skewed outcome distributions or small sample sizes. It may lack power, however, because it ignores the auxiliary baseline covariate information that is routinely collected. Wald and score tests in so-called probabilistic index models generalize the Mann-Whitney U test to enable adjustment for...

there are some barriers for rangers to take part in range plan projects andevaluation. their participation is very useful for range managers to plan and provide solutionsfor solving problems. this study aims at comparing barriers of participating from rangers andexperts point of view in lar moor rangelands, tehran, iran. in this research, data werecollected based on documentation-library and fi...

Introduction: In this study, the authors aimed to examine theeffects of cooperative learning methods using Web Quest andteam-based learning on students’ self-direction, self-regulation,and academic achievement.Methods: This is a comparative study of students taking a course inmental health and psychiatric disorders. In two consecutive years,a group of students were trained using the Web Quest a...

OBJECTIVE We evaluated the morphological and parametric characteristics of the periodontal microcirculation in patients diagnosed as having hypercholesterolemia and high levels of low-density lipoprotein (LDL). METHODS Forty patients were recruited, 20 of whom were affected by hypercholesterolemia and 20 of whom were considered healthy. A videocapillaroscopic examination was carried out on th...

In this paper we show Whitney’s fibering conjecture in the real and complex, local analytic and global algebraic cases. For a given germ of complex or real analytic set, we show the existence of a stratification satisfying a strong (real arc-analytic with respect to all variables and analytic with respect to the parameter space) trivialization property along each stratum. We call such a trivial...

to provide reliable information concerning reproductive potential of hippodamia variegata goeze and its prey (aphis fabae), their related life tables were studied under controlled laboratory conditions (at 23?c). the unprocessed data of life tables were analyzed taking the euler-lotka as the basis model. standard error of population growth parameters was calculated using the jackknife re-sampli...