Link auxiliary field method in the extended Hubbard model.

The aim of this work is to generalize the method of Hubbard fields in fermion quantum Monte Carlo simulations to the case of link fields. The introduced Hubbard link fields play the role of the interaction fields responsible for the attraction and repulsion of electronic excitations at the nodes. Such improvements lead to a number of advantages concerning thermalization time, autocorrelations, metastable states, and probability distributions of the quantities.

[Changes in perfusional and morphological parameters of the macular area after silicone oil tamponade of the vitreous cavity].

Purpose: To compare the changes of the macular morphological and functional parameters in the postoperative period in patients with silicone oil tamponade after successful surgery of the macula-on rhegmatogenous retinal detachment (RRD).

Material And Methods: The study included 20 eyes operated on for macula-on RRD, which made up the first group, and the control group (20 eyes) for comparison. All patients of the study group underwent vitrectomy using silicone oil tamponade.

Morpho-physiological features of human populations in the context of climatic--geographical conditions.

This paper is based on the data obtained in the course of population studies conducted in 33 geographical regions of the former USSR territory by the faculty of the Anuchin Research Institute and Museum of Anthropology, Lomonosov Moscow State University, between 1961 and 1991. The data resulting from study of 4386 male and 4626 female subjects aged 17 to 99 include head and body morphology, bone mineral density, blood oxygen saturation and blood biochemistry. We aimed at studying the link between the traits of a population and the climatic conditions of the area inhabited by this population.

Variation of skeletal biomarkers of biological aging in a Chuvashian population: a longitudinal study.

Osseographic score (OSS) is a skeletal biomarker of biological aging, based on assessment of the hand's radiographic features. The aims of the present cross-sectional and follow-up study were: 1) to evaluate age-related changes of OSS in a large Chuvashian cohort, and 2) to evaluate sex differences in age-related changes of OSS. This study reports on intersexual differences in the pattern of skeletal aging.

Comparative analysis of age prediction by markers of bone change in the hand assessed by roentgenography.

The major aim of this study was to develop an accurate method of age prediction for a wide range of ages based on the roentgenographic assessment of the hand bones. Such a method may be of particular interest in paleoanthropology and forensic medicine. The present paper provides the results of an analysis of individuals belonging to two ethnically different population samples: 1) Chuvasha (the Russian Federation), 293 males and 254 females, aged 18-91 and 18-86 years, respectively; and 2) Turkmenians (the Republic of Turkmenia), 257 males and 386 females, aged 18-82 and 17-83 years, respectively.