Some universal limits for nonhomogeneous birth and death processes

In this paper we consider nonhomogeneous birth and death processes (BDP) with periodic rates. Two important parameters are studied, which are helpful to describe a nonhomogeneous BDP X = X(t), t≥ 0: the limiting mean value (namely, the mean length of the queue at a given time t) and the double mean (i.e. the mean length of the queue for the whole duration of the BDP). We find conditions of existence of the means and determine bounds for their values, involving also the truncated BDP XN. Finally we present some examples where these bounds are used in order to approximate the double mean

Development of internal control methodology by using statistical methods of variability assessment of material flow business processes

Variability or instability is one of the key features of any process, including business processes of material flow internal control. Variability is a characteristic of all natural systems and technical processes. The objects which properties can be characterized via certain parameters arise at the output of any process. The article discloses the feasibility of using the statistical methods in the internal control system of business entities; in this case the focus is on the method of identifying the causes of variability using control charts of various types (Shewhart control charts) as a prime tool. The view points regarding variability of famous academic economists who researched the business process management issues are also considered. Authors’ classification of business process variation on types of material flow internal control with the allocation of controlled and uncontrolled variation is taken as the basis of the proposed application. The method of using control charts in estimating the efficiency of material flow internal control business processes is described in detail.peer-reviewe

Особенности активационных процессов коры головного мозга при олигоменорее у подростков

The article presents the data on the epidemiology of menstrual cycle disorders of Krasnoyarsk teenagers. The increase in the frequency of oligomenorrhea, indicating worsening of functional disorders of the reproductive system, has been revealed. Due to the possible relation between oligomenorrhea development and disruption of activation processes of cerebral cortex, the dynamic measurement of omega-potential of cerebral hemispheres was conducted. The study was carried out in a group of female patients before the hormone therapy and after its completion. It was revealed that the basic values of the omega-potential of the girls with oligomenorrhea are characterized with its increase, indicating a high level of mental stress. The results have revealed the dependence of normalization of the activation processes of the cerebral cortex and the option of hormonal correction of oligomenorrhea.В статье приводятся данные по эпидемиологии нарушения менструального цикла подростков г. Красноярска. Выявлено увеличение частоты олигоменореи, что свидетельствует об усугублении функциональных расстройств репродуктивной системы. В связи с возможной зависимостью развития олигоменореи и нарушением активационных процессов коры головного мозга проведено динамическое измерение омега-потенциала полушарий мозга. Исследование проведено в группе пациенток до начала гормональной терапии и после ее окончания. Выявлено, что базовые значения омега-потенциала у девушек с олигоменореей характеризуются его повышением, что свидетельствует о высоком уровне психического напряжения. Выявлена зависимость нормализации активационных процессов коры головного мозга и варианта гормональной коррекции олигоменореи

Analysis of catalysts by spectrophotometry with partial least-squares method

Введение. Многие переходные металлы, входящие в состав катализаторов, способны образовывать окрашенные комплексы, и спектрофотометрия могла бы стать удобным и недорогим методом оценки их содержания. Но из-за сильного перекрывания спектров такие методики практически не применяют в анализе катализаторов. Расширить возможности спектрофотометрии можно за счет перехода к многоволновому варианту анализа в сочетании с хемометрической обработкой спектров. Цель работы - показать возможность применения спектрофотометрии в сочетании с методом проекции на латентные структуры (PLS) для определения металлов в нанесенных катализаторах по реакциям комплексообразования с неселективным реагентом 4-(2 пиридилазо)резорцином (ПАР). Объекты анализа - Pd-Ga катализаторы на основе оксида алюминия и сибунита, а также модельная сухая смесь состава PdO-Re₂O₇/ZrO₂-Al₂O₃-Na₂SO₄. Эксперимент. Катализаторы и сухие модельные смеси, содержащие один или несколько металлов, разлагали в кислотах; полученные растворы анализировали методом атомно-эмиссионной спектрометрии с индуктивно-связанной плазмой (АЭС-ИСП), а также спектрофотометрическим методом до и после прибавления к ним реагента ПАР. Результаты. Показана возможность раздельного спектрофотометрического определения 1-4 металлов, как по собственному поглощению, так и с использованием ПАР. В случае определения нескольких металлов обработку спектральной информации вели методом PLS. PLS-градуировка построена по спектрам поглощения растворов реальных проб катализаторов с использованием данных о содержании компонентов, полученных методом АЭС-ИСП. Такой подход позволил учесть влияние матрицы и определять в катализаторах металлы с погрешностями 1-5 % отн. и относительным стандартным отклонением от 0.01 до 0.06, что сопоставимо по точности с методом АЭС-ИСП.Introduction. Many transition metals that make up catalysts are capable of forming colored complexes, and spectrophotometry could be a convenient and inexpensive method to estimate their content. However, such techniques are not widely applied in the analysis of catalysts because of the strong overlapping spectra. Multi wave analysis in combination with the chemometric treatment of the spectra can extend the capabilities of the spectrophotometry. The purpose of the experiment reported here was to show the possibility of applying spectrophotometry in combination with the partial least-squares method (PLS) to determine metals in catalysts by reactions of complex formations. It was proposed to use a non-selective reagent 4 (2 pyridylazo) resorcinol (PAR). Experimental Procedures. Catalysts and dry model mixtures containing one or more metals were decomposed by acids. Spectra of the resulting solutions and spectra of the solutions after adding the above mentioned PAR reagent were recorded. The resulting solutions were also analyzed using the reference method of atomic emission spectroscopy (AES). Results. The possibility to separately determine from 1 to 4 metals by spectrophotometry both on their own absorption in the UV region and using PAR reagent was shown. In the case of determination of several metals the partial least-squares method (PLS) was utilized for processing the spectral information. To construct the PLS-calibration for the first time, the absorption spectra of the real samples of catalysts in combination with data obtained by atomic emission spectroscopy method (AES) was used. This approach allowed considering the influence of the matrix and quantifying metals in catalysts with errors of 1-5%, and with the relative standard deviation of 0.01 to 0.06, which is comparable in accuracy to the AES method

Lipidic cubic phase serial millisecond crystallography using synchrotron radiation.

Lipidic cubic phases (LCPs) have emerged as successful matrixes for the crystallization of membrane proteins.Moreover, the viscous LCP also provides a highly effective delivery medium for serial femtosecond crystallography (SFX) at X-ray free-electron lasers (XFELs). Here, the adaptation of this technology to perform serial millisecond crystallography (SMX) at more widely available synchrotron microfocus beamlines is described. Compared with conventional microcrystallography, LCP-SMX eliminates the need for difficult handling of individual crystals and allows for data collection at room temperature. The technology is demonstrated by solving a structure of the light-driven protonpump bacteriorhodopsin (bR) at a resolution of 2.4 A ° . The room-temperature structure of bR is very similar to previous cryogenic structures but shows small yet distinct differences in the retinal ligand and proton-transfer pathway

Environmental monitoring of natural waters in Krasnodar and Stavropol Territories

The environmental monitoring of natural waters in Krasnodar (Uspensky and Novokubansky districts) and Stavropol (Kochubeyevsky District) Territories was conducted. In the course of study, various elements and compounds harmful to animals and humans, which exceed maximum permissible concentrations, were identified

The Orbital Order Parameter in La0.95Sr0.05MnO3 probed by Electron Spin Resonance

The temperature dependence of the electron-spin resonance linewidth in La0.95Sr0.05MnO3 has been determined and analyzed in the paramagnetic regime across the orbital ordering transition. From the temperature dependence and the anisotropy of linewidth and $g$-value the orbital order can be unambiguously determined via the mixing angle of the wave functions of the $e_{\rm g}$-doublet. The linewidth shows a similar evolution with temperature as resonant x-ray scattering results

Ecological and geographical confinement of rare medicinal plants of forest flora of the Kuznetski Alatau in need of protection

The subject of the study was rare medicinal plants of the forest flora of the Kuznetski Alatau. The species used in officinal, folk and homeopathic medicine were listed as medicinal plants. The list of rare medicinal plants of forest flora of the Kuznetski Alatau in need of protection is recommended on the basis of field research conducted by the author. There are 12 species in the list. The method of regular embedding of key areas and a network of expeditionary routes were used in order to select field data, which enables a reliable estimation of the floristic richness of forest flora of the studied region. Identification of rare species was based on their occurrence and abundance. The basis for ecological and geographical analysis was the assignment of each species by the confinement of its belt and zone to a particular ecological-geographical group. The basis of chronological analysis was assigning each species to a specific geographical group according to a character of areal. The distribution within the Kuznetski Alatau inside geobotanical districts is shown for each species. Endemic and relicts are indicated. Nemoral elements, which are rare in the forests of the Kuznetski Alatau, are attributed to relicts of coniferous-deciduous forests. A complex coenotic character of the studied spectrum of flora, due to substantial participation of species, confined to light coniferous, deciduous and dark coniferous forests, was found. However, the proportion of species of dark coniferous plant communities is considerably inferior to the participation of species associated with cenoses of coniferous and deciduous forests. These exact species are more plastic coenotically and environmentally and they represent the majority of additional, natural mountainous and additional mountainous species

Настойчивость и инициативность: системно-функциональный подход

The article discusses the main provisions of the system-functional approach in the disclosure of such volitional qualities as initiative and persistence. They proved that persistence and initiative in personality structure are the most important components of personality. The key elements to the disclosure of personality volitional traits are its instrumental and semantic characteristics, including dynamic, emotional, regulatory, and reflective-evaluative component.El artículo analiza las principales disposiciones del enfoque funcional del sistema en la divulgación de cualidades volitivas como la iniciativa y la persistencia. Probaron que la persistencia y la iniciativa en la estructura de la personalidad son los componentes más importantes de la personalidad. Los elementos clave para la revelación de los rasgos volitivos de la personalidad son sus características instrumentales y semánticas, que incluyen el componente dinámico, emocional, regulador y reflexivo-evaluativo. В статье рассматриваются основные положения системно-функционального подхода в раскрытии таких волевых качеств как инициативность и настойчивость. Доказывается, что в структуре личности настойчивость и инициативность являются важнейшими компонентами личности. Ключевыми в раскрытии волевых черт личности являются ее инструментально-смысловые характеристики, включающие динамический, эмоциональный, регуляторный, рефлексивно-оценочный компоненты

On the formation of skills of speech at the research and practical conference in foreign (English) language on the professional subject of bachelors and masters of non-language universities

At the Institute of Applied Mathematics and Computer Science of National Research Tomsk State University, annually for twenty years a scientific and practical student conference is held. The main purpose of this conference is to provide an opportunity for future specialists to implement the skills and abilities of practical language skills in situations of foreign language professional and scientific communication, namely to make reports in a foreign language, to discuss topics related to the scientific work of the conference participants. Teachers of the department of the English language of natural science and physics and mathematics faculties take an active part in organizing the conference; prepare bachelors and masters for presentation with reports in English. The article considers the method of training bachelors and masters to speak with their project in English at a research and practical conference in a non-language university and the role of the English language teacher in the developing of skills of speech at the conference at each stage of preparation. Many years method of preparing students to speak at a research and practical conference in a foreign language (English) at this Institute shows positive results. Students adequately present their scientific reports, showing a confident knowledge of English as a means of professional communication, thereby increasing the motivation for further improvement of English language for professional purposes