Self-stochasticity in boundary value problems of quantum mechanics

On the example of an initial-value boundary problem for the Schrödinger equation, a methodological problem of quantum mechanics has been discussed. It is shown that quantum mechanical problems can be reduced to difference equations with continuous time for which there exist so-called self-stochastic solutions. Hence, such solutions exist for quantum problems. These solutions are random function as time is large. It is shown that the Sharkovsky metric can be applied for computer simulation of limit distributions of random wave functions.Обсуждается методологическая проблема квантовой механики на примере краевой задачи с начальными условиями для уравнения Шредингера. Показано, что квантовомеханические задачи могут быть сведены к разностным уравнениям с непрерывным временем, для которых существуют так называемые самостохастические решения. Следовательно, такие решения существуют и для квантовых задач. На больших временах эти решения являются случайными функциями. Показано, что метрика Шарковского может быть применена для компьютерного моделирования предельных распределений случайных волновых функций

Shift of fibril‐forming ability of the designed α‐helical coiled‐coil peptides into the physiological pH region

Recently, we designed a short α‐helical fibril‐forming peptide (αFFP) that can form α‐helical nanofibrils at acid pH. The non‐physiological conditions of the fibril formation hamper biomedical application of αFFP. It was hypothesized that electrostatic repulsion between glutamic acid residues present at positions (g) of the αFFP coiled‐coil sequence prevent the fibrillogenesis at neutral pH, while their protonation below pH 5.5 triggers axial growth of the fibril. To test this hypothesis, we synthesized αFFPs where all glutamic acid residues were substituted by glutamines or serines. The electron microscopy study confirmed that the modified αFFPs form nanofibrils in a wider range of pH (2.5-11). Circular dichroism spectroscopy, sedimentation, diffusion and differential scanning calorimetry showed that the fibrils are α‐helical and have elongated and highly stable cooperative tertiary structures. This work leads to a better understanding of interactions that control the fibrillogenesis of the αFFPs and opens opportunities for their biomedical applicatio

La expectativa de jubilación como un estrés psicológico que afecta la edad biológica en las persona de la Federación de Rusa

The method of age-related samples is used. Biological age is estimated using a formula including indicators of metabolism, cardiovascular, respiratory, equilibrium systems, and psychological health questionnaire data. The biological age, proper biological age, and relative aging index have been researched. Examinees were adults of 26 - 88 years old, divided into 9 age groups. We’ve founded two types of psychological stress affecting a person’s biological age: stress caused by the expectation of retirement and stress on the retirement. Upon the results of the study, it’s stated that in Russia the biological age of a person is associated with a calendar inverted U-shaped dependence. The peak of relative aging happens on the pre-retirement and post-retirement ages. In women, biological aging begins to intensify in the period of 51-60 years, in men in 46-50 years, in women it stops in the period of 66-70 years, and in men only after 71 years. The maximum of biological consenescence in women occurs immediately after retirement (56-60 years), and in men at the age of the expectation of retirement (56-60 years). Based on the achieved data, it can be concluded that psychological stress caused by the expectation of retirement exists, it’s more severe in men than in women.Se utiliza el método de muestras relacionadas con la edad. La edad biológica se estima utilizando una fórmula que incluye indicadores de metabolismo, cardiovasculares, respiratorios, sistemas de equilibrio y datos de cuestionarios de salud psicológica. Se ha investigado la edad biológica, la edad biológica adecuada y el índice de envejecimiento relativo. Los examinados eran adultos de 26 a 88 años, divididos en 9 grupos de edad. Hemos fundado dos tipos de estrés psicológico que afectan la edad biológica de una persona: el estrés causado por la expectativa de jubilación y el estrés en la jubilación. Sobre los resultados del estudio, se afirma que en Rusia la edad biológica de una persona está asociada con una dependencia de calendario en forma de U invertida. El pico del envejecimiento relativo ocurre en las edades previas y posteriores a la jubilación. En las mujeres, el envejecimiento biológico comienza a intensificarse en el período de 51-60 años, en los hombres en 46-50 años, en las mujeres se detiene en el período de 66-70 años, y en los hombres solo después de 71 años. El máximo de consenso biológico en las mujeres ocurre inmediatamente después de la jubilación (56-60 años) y en los hombres a la edad de la expectativa de jubilación (56-60 años). Con base en los datos obtenidos, se puede concluir que el estrés psicológico causado por la expectativa de jubilación existe, es más severo en los hombres que en las mujeres

Influence of the cooling rate on the structure and mechanical properties of a cast alloy of Al-Mg-Si system

An investigation of influence of the cooling rate on the structure and hardness of a new cast eutectic (α-Al + Mg2Si) alloy of the Al—Mg—Si ternary system showed that the critical cooling rate at which a colonial eutectic structure disappears is ~10^5 K/s. The change-over from laboratory castings with a weight of 200g to commercial castings with a weight of 20 kg practically does not influence on the level of mechanical properties under comparable cooling conditions

Formation of Superhard Nanostructured Ti–Hf–N(Fe) Coatings Obtained by Vacuum Arc Deposition in HF discharge

Superhard nanostructured Ti–Hf–N(Fe) coatings are prepared. The formation of local regions of (Ti, Hf)N, FeN, and Hf is detected using μ-PIXE (ion microbeam). It is revealed that the synthesized coatings have a nanohardness of 48 ± 1 GPa and are composed of nanograins with a size of 4.8–10.6 nm, which are enveloped by finer entities of other phases (Ti, Fe)N and FeN. There is a good correlation between the results derived by XRD, TEM, AFM, and SEM and microanalysis, which in turn are complemented by the analysis results obtained using an ion microbeam and PIXE. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3492

Kinetics of nonsymmetrical impurity segregation at thin film boundaries

Theoretical and numerical analysis is presented for kinetics of impurity segregation at the boundaries of a thin layer of substance dividing two different materials. Time dependences of boundary impurity concentrations and concentration profiles within the film have been obtained. Depending on the energy of impurity interaction with the boundaries and the temperature, some criteria were established to predict probable realization of segregation process. The time of exhausting of areas adjusting segregation layers and the width of the exhausted zone near the boundaries was evaluated