On strictly Deza graphs with parameters (n,k,k-1,a)

A nonempty $k$-regular graph $\Gamma$ on $n$ vertices is called a Deza graph if there exist constants $b$ and $a$ $(b \geq a)$ such that any pair of distinct vertices of $\Gamma$ has precisely either $b$ or $a$ common neighbours. The quantities $n$, $k$, $b$, and $a$ are called the parameters of $\Gamma$ and are written as the quadruple $(n,k,b,a)$. If a Deza graph has diameter 2 and is not strongly regular, then it is called a strictly Deza graph. In the paper we investigate strictly Deza graphs with parameters $(n, k, b, a)$, where its quantities satisfy the conditions $k = b + 1$ and $\frac{k(k - 1) - a(n - 1)}{b - a} > 1$.Comment: Any comments or suggestions are very welcom

Dislocation loops in overheated free-standing smectic films

Static and dynamic phenomena in overheated free-standing smectic-A films are studied using a generalization of de Gennes' theory for a confined presmectic liquid. A static application is to determine the profile of the film meniscus and the meniscus contact angle, the results being compared with those of a recent study employing de Gennes' original theory. The dynamical generalization of the theory is based on on a time-dependent Ginzburg-Landau approach. This is used to compare two modes for layer-thinning transitions in overheated films, namely "uniform thinning" vs. nucleation of dislocation loops. Properties such as the line tension and velocity of a moving dislocation line are evaluated self-consistently by the theory.Comment: 16 pages, 8 figure

INFLUENCE OF THE COMPOSITION OF A LOW-MELTING ADDITIVE ON THE MAGNETIC HYSTERESIS PROPERTIES OF Nd-Fe-B NANOCRYSTALLINE ALLOYS AFTER INFILTRATION

In this work the influence of infiltration of low-melting additives on the magnetic hysteresis properties of a nanocrystalline alloy based of the compound Nd-Fe-B was investigated. It was found that additives R-Cu-Co (R = Gd, Ce, and La) lead to an increase in the coercivity from 30% to 40%.Исследование выполнено за счет гранта Российского научного фонда (проект № 21-72-10104)

Peculiarities of the resettlement of the first generation offspring of the exposed Techa River population

The objective of this study was to assess main regularities of resettlement of the first generation offspring of the exposed Techa River population. In the given paper the information on places and periods of residence of the population exposed on the Techa River and their offspring, obtained from the medical-dosimetric database of the URCRM was used. Groups of the first generation offspring of exposed people living at various distances from the Techa River were identified. Main regularities of resettlement of a large group of offspring of the exposed Techa River population (26 300 persons) over the period 1950-2010 were revealed. Chelyabinsk Oblast is the main resettlement area of the first generation offspring of the exposed Techa River population. The proportion of offspring living outside of their primary resettlement area is gradually increasing. Offspring outflow from the Kurgan Oblast is greater than that from the Chelyabinsk Oblast. The main part (45.9%) of the first generation offspring of the exposed Techa River population alive as of 2010 was gathered in cities. Migration of the exposed population promoted increase in the number of marriages between exposed and unexposed persons, to the birth of offspring whose one parent (either mother or father) was exposed and led to decrease in the number of offspring whose both parents were exposed. In the current study for the first time peculiarities of resettlement of two generation of people residing on radioactively-contaminated territories, exposed people and their offspring, were compared. Marked differences in the nature of resettlement of the Techa River exposed population offspring relative to their parents were registered. Offspring migrated more frequently, which is expressed in the increase in their proportion in cities up to 45.9% as compared to that of exposed persons – 30.8% (p<0.001). At the same time the proportion of the first generation offspring of the exposed Techa River population, who reside in Techa riverside settlements, is decreasing as compared to that of the exposed persons. In contrast to first generation offspring alive as of 2010, a bigger part of deceased offspring as of 2010 (30.7%) was registered in Techa riverside villages

Особенности расселения потомков первого поколения облучённого на реке Теча населения

The objective of this study was to assess main regularities of resettlement of the first generation offspring of the exposed Techa River population. In the given paper the information on places and periods of residence of the population exposed on the Techa River and their offspring, obtained from the medical-dosimetric database of the URCRM was used. Groups of the first generation offspring of exposed people living at various distances from the Techa River were identified. Main regularities of resettlement of a large group of offspring of the exposed Techa River population (26 300 persons) over the period 1950-2010 were revealed. Chelyabinsk Oblast is the main resettlement area of the first generation offspring of the exposed Techa River population. The proportion of offspring living outside of their primary resettlement area is gradually increasing. Offspring outflow from the Kurgan Oblast is greater than that from the Chelyabinsk Oblast. The main part (45.9%) of the first generation offspring of the exposed Techa River population alive as of 2010 was gathered in cities. Migration of the exposed population promoted increase in the number of marriages between exposed and unexposed persons, to the birth of offspring whose one parent (either mother or father) was exposed and led to decrease in the number of offspring whose both parents were exposed. In the current study for the first time peculiarities of resettlement of two generation of people residing on radioactively-contaminated territories, exposed people and their offspring, were compared. Marked differences in the nature of resettlement of the Techa River exposed population offspring relative to their parents were registered. Offspring migrated more frequently, which is expressed in the increase in their proportion in cities up to 45.9% as compared to that of exposed persons – 30.8% (p<0.001). At the same time the proportion of the first generation offspring of the exposed Techa River population, who reside in Techa riverside settlements, is decreasing as compared to that of the exposed persons. In contrast to first generation offspring alive as of 2010, a bigger part of deceased offspring as of 2010 (30.7%) was registered in Techa riverside villages.Целью работы была оценка основных особенностей расселения потомков первого поколения облучённого на реке Теча населения. Использована информация из медико-дозиметрической базы данных Уральского научно-практического центра радиационной медицины (УНПЦ РМ) о местах и сроках проживания облученных на реке Теча лиц и их потомков. Выделены группы потомков первого по-коления от облучённых на реке Теча граждан, проживающие на различном удалении от реки Теча. Установлены основные направления расселения большой по численности группы потомков облучённых на реке Теча лиц (26 306 человек) за период времени с 1950 по 2010 г. Основным регионом расселения потомков первого поколения облучённого на реке Теча населения является Челябинская область. Последовательно увеличивается доля потомков, проживающих за пределами их первоначального расселения. Убыль потомков из Курганской области является более значительной, чем их убыль из Челябинской области. Основная доля потомков первого поколения облучённого на реке Теча населения (45,9%), живых к 2010 г., сосредоточена в городах. Миграция облучённого населения способствовала увеличению браков между облучёнными и необлучёнными лицами, рождению потомков облучённого на-селения с одним (отец или мать) и уменьшению рождений с двумя облучёнными родителями. В настоящем исследовании впервые проведено сопоставление особенностей расселения двух поколений людей, проживающих на радиоактивно загрязнённой территории – облучённых лиц и их потомков первого поколения. Отмечены выраженные различия в характере расселения потомков облучённого на реке Теча населения, по сравнению с родителями. Миграционная активность потомков является более выраженной, что, в частности, проявляется в увеличении их доли, выявляемой в городах, до 45,9% по сравнению с аналогичной долей для облучённых лиц, составившей 30,8% (p<0,001). В то же время доля потомков первого поколения облучённого на реке Теча населения, проживающих в сёлах, расположен-ных на побережье реки Теча, уменьшается при сравнении с облучёнными лицами. В отличие от живых к 2010 г. потомков первого поколения, большая часть умерших к данному времени потомков (30,7%) выявляется в пунктах контакта с ионизирующим излучением