Resonant Tunneling Nanostructures: Eliminating Current Saturation on Negative Differential Conductivity Region in Compact Dissipative Simulations.

A solution to the problem of resonant tunneling current saturation is proposed. This problem does not allow, within the traditional compact models, a correct qualitative and quantitative analysis to be carried out of the volt-ampere characteristics of double-barrier heterostructures. The reason for this problem is the asymptotic behavior of the function describing the structure transparency, so a non-saturating compact model was proposed to solve the problem of current transfer analysis in the region of negative differential conductivity.

Bistability of AlGaAs/GaAs Resonant-Tunneling Diodes Heterostructural Channel.

This paper presents an effective compact model of current transfer for the estimation of hysteresis parameters on the volt-ampere characteristics of resonant-tunneling diodes. In the framework of the compact model, the appearance of hysteresis is explained as a manifestation of internal bistability due to interelectronic interaction in the channel of the resonant-tunneling structure. Unlike the models based on the method of equivalent circuits, the interelectronic interaction in the compact model is taken into account using the concentration parameter.

[The load and diversity of hereditary diseases in four raions of Rostov oblast].

The results of a medical genetic survey of the population of four raions (176 535 individuals) of Rostov oblast (Dubovsky, Zimovnikovsky, Myasnikovsky, and Krasnosulinsky raions) are presented. The load of autosomal dominant (AD), autosomal recessive (AR), and X-linked hereditary diseases for urban and rural population was calculated, and the diversity of monogenic hereditary diseases (MHD) was reviewed. The nosological spectrum of MHD constituted 117 diseases (63 diseases with AD inheritance; 38 with AR inheritance; and 16 with X-linked inheritance).

[Epidemiology of monogenic hereditary diseases in Rostov oblast: population dynamic factors determining the differentiation of the load of hereditary diseases in eight districts].

Analysis of the diversity of monogenic hereditary diseases in eight raions (districts) of Rostov oblast (region) of Russia (Tsimlyansk, Volgodonskoi, Tselina, Egorlykskaya, Millerovo, Tarasovskaya, Rodionovo-Nesvetaiskaya, and Matveevo-Kurgan raions) has been summarized. The total sample size was 320925 subjects. The spectrum of hereditary diseases detected in the eight districts comprises 187 diseases, including 99 autosomal dominant (AD), 72 autosomal recessive (AR), and 16 X-linked diseases.

[Epidemiology of monogenic hereditary diseases in Rostov Oblast: population dynamic factors determining the differentiation of the load of hereditary diseases in eight districts].

A genetic epidemiological study has been carried out in eight raions (districts) of Rostov oblast (region) of Russia: Tsimlyansk, Volgodonskoi, Tselina, Egorlykskaya, Millerovo, Tarasovskaya, Rodionovo-Nesvetaiskaya, and Matveevo-Kurgan raions. The population structure (the parameters of the isolation by distance model, ethnic assortative marriage, random inbreeding (F(ST), endogamy index, and ie) and the genetic demographic characteristics of the regional population (vital statistics, Crow's index, and its components) have been analyzed. The total sample size was 320925 subjects (including 114106 and 206816 urban and rural residents, respectively).